2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/kernel.h>
20 #include <linux/bio.h>
21 #include <linux/buffer_head.h>
22 #include <linux/file.h>
24 #include <linux/pagemap.h>
25 #include <linux/highmem.h>
26 #include <linux/time.h>
27 #include <linux/init.h>
28 #include <linux/string.h>
29 #include <linux/backing-dev.h>
30 #include <linux/mpage.h>
31 #include <linux/swap.h>
32 #include <linux/writeback.h>
33 #include <linux/statfs.h>
34 #include <linux/compat.h>
35 #include <linux/bit_spinlock.h>
36 #include <linux/xattr.h>
37 #include <linux/posix_acl.h>
38 #include <linux/falloc.h>
39 #include <linux/slab.h>
43 #include "transaction.h"
44 #include "btrfs_inode.h"
46 #include "print-tree.h"
48 #include "ordered-data.h"
51 #include "compression.h"
53 #include "free-space-cache.h"
55 struct btrfs_iget_args {
57 struct btrfs_root *root;
60 static const struct inode_operations btrfs_dir_inode_operations;
61 static const struct inode_operations btrfs_symlink_inode_operations;
62 static const struct inode_operations btrfs_dir_ro_inode_operations;
63 static const struct inode_operations btrfs_special_inode_operations;
64 static const struct inode_operations btrfs_file_inode_operations;
65 static const struct address_space_operations btrfs_aops;
66 static const struct address_space_operations btrfs_symlink_aops;
67 static const struct file_operations btrfs_dir_file_operations;
68 static struct extent_io_ops btrfs_extent_io_ops;
70 static struct kmem_cache *btrfs_inode_cachep;
71 struct kmem_cache *btrfs_trans_handle_cachep;
72 struct kmem_cache *btrfs_transaction_cachep;
73 struct kmem_cache *btrfs_path_cachep;
74 struct kmem_cache *btrfs_free_space_cachep;
77 static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
78 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
79 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
80 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
81 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
82 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
83 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
84 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
87 static int btrfs_setsize(struct inode *inode, loff_t newsize);
88 static int btrfs_truncate(struct inode *inode);
89 static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end);
90 static noinline int cow_file_range(struct inode *inode,
91 struct page *locked_page,
92 u64 start, u64 end, int *page_started,
93 unsigned long *nr_written, int unlock);
95 static int btrfs_init_inode_security(struct btrfs_trans_handle *trans,
96 struct inode *inode, struct inode *dir)
100 err = btrfs_init_acl(trans, inode, dir);
102 err = btrfs_xattr_security_init(trans, inode, dir);
107 * this does all the hard work for inserting an inline extent into
108 * the btree. The caller should have done a btrfs_drop_extents so that
109 * no overlapping inline items exist in the btree
111 static noinline int insert_inline_extent(struct btrfs_trans_handle *trans,
112 struct btrfs_root *root, struct inode *inode,
113 u64 start, size_t size, size_t compressed_size,
115 struct page **compressed_pages)
117 struct btrfs_key key;
118 struct btrfs_path *path;
119 struct extent_buffer *leaf;
120 struct page *page = NULL;
123 struct btrfs_file_extent_item *ei;
126 size_t cur_size = size;
128 unsigned long offset;
130 if (compressed_size && compressed_pages)
131 cur_size = compressed_size;
133 path = btrfs_alloc_path();
137 path->leave_spinning = 1;
138 btrfs_set_trans_block_group(trans, inode);
140 key.objectid = inode->i_ino;
142 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
143 datasize = btrfs_file_extent_calc_inline_size(cur_size);
145 inode_add_bytes(inode, size);
146 ret = btrfs_insert_empty_item(trans, root, path, &key,
153 leaf = path->nodes[0];
154 ei = btrfs_item_ptr(leaf, path->slots[0],
155 struct btrfs_file_extent_item);
156 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
157 btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE);
158 btrfs_set_file_extent_encryption(leaf, ei, 0);
159 btrfs_set_file_extent_other_encoding(leaf, ei, 0);
160 btrfs_set_file_extent_ram_bytes(leaf, ei, size);
161 ptr = btrfs_file_extent_inline_start(ei);
163 if (compress_type != BTRFS_COMPRESS_NONE) {
166 while (compressed_size > 0) {
167 cpage = compressed_pages[i];
168 cur_size = min_t(unsigned long, compressed_size,
171 kaddr = kmap_atomic(cpage, KM_USER0);
172 write_extent_buffer(leaf, kaddr, ptr, cur_size);
173 kunmap_atomic(kaddr, KM_USER0);
177 compressed_size -= cur_size;
179 btrfs_set_file_extent_compression(leaf, ei,
182 page = find_get_page(inode->i_mapping,
183 start >> PAGE_CACHE_SHIFT);
184 btrfs_set_file_extent_compression(leaf, ei, 0);
185 kaddr = kmap_atomic(page, KM_USER0);
186 offset = start & (PAGE_CACHE_SIZE - 1);
187 write_extent_buffer(leaf, kaddr + offset, ptr, size);
188 kunmap_atomic(kaddr, KM_USER0);
189 page_cache_release(page);
191 btrfs_mark_buffer_dirty(leaf);
192 btrfs_free_path(path);
195 * we're an inline extent, so nobody can
196 * extend the file past i_size without locking
197 * a page we already have locked.
199 * We must do any isize and inode updates
200 * before we unlock the pages. Otherwise we
201 * could end up racing with unlink.
203 BTRFS_I(inode)->disk_i_size = inode->i_size;
204 btrfs_update_inode(trans, root, inode);
208 btrfs_free_path(path);
214 * conditionally insert an inline extent into the file. This
215 * does the checks required to make sure the data is small enough
216 * to fit as an inline extent.
218 static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans,
219 struct btrfs_root *root,
220 struct inode *inode, u64 start, u64 end,
221 size_t compressed_size, int compress_type,
222 struct page **compressed_pages)
224 u64 isize = i_size_read(inode);
225 u64 actual_end = min(end + 1, isize);
226 u64 inline_len = actual_end - start;
227 u64 aligned_end = (end + root->sectorsize - 1) &
228 ~((u64)root->sectorsize - 1);
230 u64 data_len = inline_len;
234 data_len = compressed_size;
237 actual_end >= PAGE_CACHE_SIZE ||
238 data_len >= BTRFS_MAX_INLINE_DATA_SIZE(root) ||
240 (actual_end & (root->sectorsize - 1)) == 0) ||
242 data_len > root->fs_info->max_inline) {
246 ret = btrfs_drop_extents(trans, inode, start, aligned_end,
250 if (isize > actual_end)
251 inline_len = min_t(u64, isize, actual_end);
252 ret = insert_inline_extent(trans, root, inode, start,
253 inline_len, compressed_size,
254 compress_type, compressed_pages);
256 btrfs_delalloc_release_metadata(inode, end + 1 - start);
257 btrfs_drop_extent_cache(inode, start, aligned_end - 1, 0);
261 struct async_extent {
266 unsigned long nr_pages;
268 struct list_head list;
273 struct btrfs_root *root;
274 struct page *locked_page;
277 struct list_head extents;
278 struct btrfs_work work;
281 static noinline int add_async_extent(struct async_cow *cow,
282 u64 start, u64 ram_size,
285 unsigned long nr_pages,
288 struct async_extent *async_extent;
290 async_extent = kmalloc(sizeof(*async_extent), GFP_NOFS);
291 BUG_ON(!async_extent);
292 async_extent->start = start;
293 async_extent->ram_size = ram_size;
294 async_extent->compressed_size = compressed_size;
295 async_extent->pages = pages;
296 async_extent->nr_pages = nr_pages;
297 async_extent->compress_type = compress_type;
298 list_add_tail(&async_extent->list, &cow->extents);
303 * we create compressed extents in two phases. The first
304 * phase compresses a range of pages that have already been
305 * locked (both pages and state bits are locked).
307 * This is done inside an ordered work queue, and the compression
308 * is spread across many cpus. The actual IO submission is step
309 * two, and the ordered work queue takes care of making sure that
310 * happens in the same order things were put onto the queue by
311 * writepages and friends.
313 * If this code finds it can't get good compression, it puts an
314 * entry onto the work queue to write the uncompressed bytes. This
315 * makes sure that both compressed inodes and uncompressed inodes
316 * are written in the same order that pdflush sent them down.
318 static noinline int compress_file_range(struct inode *inode,
319 struct page *locked_page,
321 struct async_cow *async_cow,
324 struct btrfs_root *root = BTRFS_I(inode)->root;
325 struct btrfs_trans_handle *trans;
327 u64 blocksize = root->sectorsize;
329 u64 isize = i_size_read(inode);
331 struct page **pages = NULL;
332 unsigned long nr_pages;
333 unsigned long nr_pages_ret = 0;
334 unsigned long total_compressed = 0;
335 unsigned long total_in = 0;
336 unsigned long max_compressed = 128 * 1024;
337 unsigned long max_uncompressed = 128 * 1024;
340 int compress_type = root->fs_info->compress_type;
342 actual_end = min_t(u64, isize, end + 1);
345 nr_pages = (end >> PAGE_CACHE_SHIFT) - (start >> PAGE_CACHE_SHIFT) + 1;
346 nr_pages = min(nr_pages, (128 * 1024UL) / PAGE_CACHE_SIZE);
349 * we don't want to send crud past the end of i_size through
350 * compression, that's just a waste of CPU time. So, if the
351 * end of the file is before the start of our current
352 * requested range of bytes, we bail out to the uncompressed
353 * cleanup code that can deal with all of this.
355 * It isn't really the fastest way to fix things, but this is a
356 * very uncommon corner.
358 if (actual_end <= start)
359 goto cleanup_and_bail_uncompressed;
361 total_compressed = actual_end - start;
363 /* we want to make sure that amount of ram required to uncompress
364 * an extent is reasonable, so we limit the total size in ram
365 * of a compressed extent to 128k. This is a crucial number
366 * because it also controls how easily we can spread reads across
367 * cpus for decompression.
369 * We also want to make sure the amount of IO required to do
370 * a random read is reasonably small, so we limit the size of
371 * a compressed extent to 128k.
373 total_compressed = min(total_compressed, max_uncompressed);
374 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
375 num_bytes = max(blocksize, num_bytes);
380 * we do compression for mount -o compress and when the
381 * inode has not been flagged as nocompress. This flag can
382 * change at any time if we discover bad compression ratios.
384 if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) &&
385 (btrfs_test_opt(root, COMPRESS) ||
386 (BTRFS_I(inode)->force_compress) ||
387 (BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS))) {
389 pages = kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS);
392 if (BTRFS_I(inode)->force_compress)
393 compress_type = BTRFS_I(inode)->force_compress;
395 ret = btrfs_compress_pages(compress_type,
396 inode->i_mapping, start,
397 total_compressed, pages,
398 nr_pages, &nr_pages_ret,
404 unsigned long offset = total_compressed &
405 (PAGE_CACHE_SIZE - 1);
406 struct page *page = pages[nr_pages_ret - 1];
409 /* zero the tail end of the last page, we might be
410 * sending it down to disk
413 kaddr = kmap_atomic(page, KM_USER0);
414 memset(kaddr + offset, 0,
415 PAGE_CACHE_SIZE - offset);
416 kunmap_atomic(kaddr, KM_USER0);
422 trans = btrfs_join_transaction(root, 1);
423 BUG_ON(IS_ERR(trans));
424 btrfs_set_trans_block_group(trans, inode);
425 trans->block_rsv = &root->fs_info->delalloc_block_rsv;
427 /* lets try to make an inline extent */
428 if (ret || total_in < (actual_end - start)) {
429 /* we didn't compress the entire range, try
430 * to make an uncompressed inline extent.
432 ret = cow_file_range_inline(trans, root, inode,
433 start, end, 0, 0, NULL);
435 /* try making a compressed inline extent */
436 ret = cow_file_range_inline(trans, root, inode,
439 compress_type, pages);
443 * inline extent creation worked, we don't need
444 * to create any more async work items. Unlock
445 * and free up our temp pages.
447 extent_clear_unlock_delalloc(inode,
448 &BTRFS_I(inode)->io_tree,
450 EXTENT_CLEAR_UNLOCK_PAGE | EXTENT_CLEAR_DIRTY |
451 EXTENT_CLEAR_DELALLOC |
452 EXTENT_SET_WRITEBACK | EXTENT_END_WRITEBACK);
454 btrfs_end_transaction(trans, root);
457 btrfs_end_transaction(trans, root);
462 * we aren't doing an inline extent round the compressed size
463 * up to a block size boundary so the allocator does sane
466 total_compressed = (total_compressed + blocksize - 1) &
470 * one last check to make sure the compression is really a
471 * win, compare the page count read with the blocks on disk
473 total_in = (total_in + PAGE_CACHE_SIZE - 1) &
474 ~(PAGE_CACHE_SIZE - 1);
475 if (total_compressed >= total_in) {
478 num_bytes = total_in;
481 if (!will_compress && pages) {
483 * the compression code ran but failed to make things smaller,
484 * free any pages it allocated and our page pointer array
486 for (i = 0; i < nr_pages_ret; i++) {
487 WARN_ON(pages[i]->mapping);
488 page_cache_release(pages[i]);
492 total_compressed = 0;
495 /* flag the file so we don't compress in the future */
496 if (!btrfs_test_opt(root, FORCE_COMPRESS) &&
497 !(BTRFS_I(inode)->force_compress)) {
498 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
504 /* the async work queues will take care of doing actual
505 * allocation on disk for these compressed pages,
506 * and will submit them to the elevator.
508 add_async_extent(async_cow, start, num_bytes,
509 total_compressed, pages, nr_pages_ret,
512 if (start + num_bytes < end) {
519 cleanup_and_bail_uncompressed:
521 * No compression, but we still need to write the pages in
522 * the file we've been given so far. redirty the locked
523 * page if it corresponds to our extent and set things up
524 * for the async work queue to run cow_file_range to do
525 * the normal delalloc dance
527 if (page_offset(locked_page) >= start &&
528 page_offset(locked_page) <= end) {
529 __set_page_dirty_nobuffers(locked_page);
530 /* unlocked later on in the async handlers */
532 add_async_extent(async_cow, start, end - start + 1,
533 0, NULL, 0, BTRFS_COMPRESS_NONE);
541 for (i = 0; i < nr_pages_ret; i++) {
542 WARN_ON(pages[i]->mapping);
543 page_cache_release(pages[i]);
551 * phase two of compressed writeback. This is the ordered portion
552 * of the code, which only gets called in the order the work was
553 * queued. We walk all the async extents created by compress_file_range
554 * and send them down to the disk.
556 static noinline int submit_compressed_extents(struct inode *inode,
557 struct async_cow *async_cow)
559 struct async_extent *async_extent;
561 struct btrfs_trans_handle *trans;
562 struct btrfs_key ins;
563 struct extent_map *em;
564 struct btrfs_root *root = BTRFS_I(inode)->root;
565 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
566 struct extent_io_tree *io_tree;
569 if (list_empty(&async_cow->extents))
573 while (!list_empty(&async_cow->extents)) {
574 async_extent = list_entry(async_cow->extents.next,
575 struct async_extent, list);
576 list_del(&async_extent->list);
578 io_tree = &BTRFS_I(inode)->io_tree;
581 /* did the compression code fall back to uncompressed IO? */
582 if (!async_extent->pages) {
583 int page_started = 0;
584 unsigned long nr_written = 0;
586 lock_extent(io_tree, async_extent->start,
587 async_extent->start +
588 async_extent->ram_size - 1, GFP_NOFS);
590 /* allocate blocks */
591 ret = cow_file_range(inode, async_cow->locked_page,
593 async_extent->start +
594 async_extent->ram_size - 1,
595 &page_started, &nr_written, 0);
598 * if page_started, cow_file_range inserted an
599 * inline extent and took care of all the unlocking
600 * and IO for us. Otherwise, we need to submit
601 * all those pages down to the drive.
603 if (!page_started && !ret)
604 extent_write_locked_range(io_tree,
605 inode, async_extent->start,
606 async_extent->start +
607 async_extent->ram_size - 1,
615 lock_extent(io_tree, async_extent->start,
616 async_extent->start + async_extent->ram_size - 1,
619 trans = btrfs_join_transaction(root, 1);
620 BUG_ON(IS_ERR(trans));
621 ret = btrfs_reserve_extent(trans, root,
622 async_extent->compressed_size,
623 async_extent->compressed_size,
626 btrfs_end_transaction(trans, root);
630 for (i = 0; i < async_extent->nr_pages; i++) {
631 WARN_ON(async_extent->pages[i]->mapping);
632 page_cache_release(async_extent->pages[i]);
634 kfree(async_extent->pages);
635 async_extent->nr_pages = 0;
636 async_extent->pages = NULL;
637 unlock_extent(io_tree, async_extent->start,
638 async_extent->start +
639 async_extent->ram_size - 1, GFP_NOFS);
644 * here we're doing allocation and writeback of the
647 btrfs_drop_extent_cache(inode, async_extent->start,
648 async_extent->start +
649 async_extent->ram_size - 1, 0);
651 em = alloc_extent_map(GFP_NOFS);
653 em->start = async_extent->start;
654 em->len = async_extent->ram_size;
655 em->orig_start = em->start;
657 em->block_start = ins.objectid;
658 em->block_len = ins.offset;
659 em->bdev = root->fs_info->fs_devices->latest_bdev;
660 em->compress_type = async_extent->compress_type;
661 set_bit(EXTENT_FLAG_PINNED, &em->flags);
662 set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
665 write_lock(&em_tree->lock);
666 ret = add_extent_mapping(em_tree, em);
667 write_unlock(&em_tree->lock);
668 if (ret != -EEXIST) {
672 btrfs_drop_extent_cache(inode, async_extent->start,
673 async_extent->start +
674 async_extent->ram_size - 1, 0);
677 ret = btrfs_add_ordered_extent_compress(inode,
680 async_extent->ram_size,
682 BTRFS_ORDERED_COMPRESSED,
683 async_extent->compress_type);
687 * clear dirty, set writeback and unlock the pages.
689 extent_clear_unlock_delalloc(inode,
690 &BTRFS_I(inode)->io_tree,
692 async_extent->start +
693 async_extent->ram_size - 1,
694 NULL, EXTENT_CLEAR_UNLOCK_PAGE |
695 EXTENT_CLEAR_UNLOCK |
696 EXTENT_CLEAR_DELALLOC |
697 EXTENT_CLEAR_DIRTY | EXTENT_SET_WRITEBACK);
699 ret = btrfs_submit_compressed_write(inode,
701 async_extent->ram_size,
703 ins.offset, async_extent->pages,
704 async_extent->nr_pages);
707 alloc_hint = ins.objectid + ins.offset;
715 static u64 get_extent_allocation_hint(struct inode *inode, u64 start,
718 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
719 struct extent_map *em;
722 read_lock(&em_tree->lock);
723 em = search_extent_mapping(em_tree, start, num_bytes);
726 * if block start isn't an actual block number then find the
727 * first block in this inode and use that as a hint. If that
728 * block is also bogus then just don't worry about it.
730 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
732 em = search_extent_mapping(em_tree, 0, 0);
733 if (em && em->block_start < EXTENT_MAP_LAST_BYTE)
734 alloc_hint = em->block_start;
738 alloc_hint = em->block_start;
742 read_unlock(&em_tree->lock);
748 * when extent_io.c finds a delayed allocation range in the file,
749 * the call backs end up in this code. The basic idea is to
750 * allocate extents on disk for the range, and create ordered data structs
751 * in ram to track those extents.
753 * locked_page is the page that writepage had locked already. We use
754 * it to make sure we don't do extra locks or unlocks.
756 * *page_started is set to one if we unlock locked_page and do everything
757 * required to start IO on it. It may be clean and already done with
760 static noinline int cow_file_range(struct inode *inode,
761 struct page *locked_page,
762 u64 start, u64 end, int *page_started,
763 unsigned long *nr_written,
766 struct btrfs_root *root = BTRFS_I(inode)->root;
767 struct btrfs_trans_handle *trans;
770 unsigned long ram_size;
773 u64 blocksize = root->sectorsize;
774 struct btrfs_key ins;
775 struct extent_map *em;
776 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
779 BUG_ON(root == root->fs_info->tree_root);
780 trans = btrfs_join_transaction(root, 1);
781 BUG_ON(IS_ERR(trans));
782 btrfs_set_trans_block_group(trans, inode);
783 trans->block_rsv = &root->fs_info->delalloc_block_rsv;
785 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
786 num_bytes = max(blocksize, num_bytes);
787 disk_num_bytes = num_bytes;
791 /* lets try to make an inline extent */
792 ret = cow_file_range_inline(trans, root, inode,
793 start, end, 0, 0, NULL);
795 extent_clear_unlock_delalloc(inode,
796 &BTRFS_I(inode)->io_tree,
798 EXTENT_CLEAR_UNLOCK_PAGE |
799 EXTENT_CLEAR_UNLOCK |
800 EXTENT_CLEAR_DELALLOC |
802 EXTENT_SET_WRITEBACK |
803 EXTENT_END_WRITEBACK);
805 *nr_written = *nr_written +
806 (end - start + PAGE_CACHE_SIZE) / PAGE_CACHE_SIZE;
813 BUG_ON(disk_num_bytes >
814 btrfs_super_total_bytes(&root->fs_info->super_copy));
816 alloc_hint = get_extent_allocation_hint(inode, start, num_bytes);
817 btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0);
819 while (disk_num_bytes > 0) {
822 cur_alloc_size = disk_num_bytes;
823 ret = btrfs_reserve_extent(trans, root, cur_alloc_size,
824 root->sectorsize, 0, alloc_hint,
828 em = alloc_extent_map(GFP_NOFS);
831 em->orig_start = em->start;
832 ram_size = ins.offset;
833 em->len = ins.offset;
835 em->block_start = ins.objectid;
836 em->block_len = ins.offset;
837 em->bdev = root->fs_info->fs_devices->latest_bdev;
838 set_bit(EXTENT_FLAG_PINNED, &em->flags);
841 write_lock(&em_tree->lock);
842 ret = add_extent_mapping(em_tree, em);
843 write_unlock(&em_tree->lock);
844 if (ret != -EEXIST) {
848 btrfs_drop_extent_cache(inode, start,
849 start + ram_size - 1, 0);
852 cur_alloc_size = ins.offset;
853 ret = btrfs_add_ordered_extent(inode, start, ins.objectid,
854 ram_size, cur_alloc_size, 0);
857 if (root->root_key.objectid ==
858 BTRFS_DATA_RELOC_TREE_OBJECTID) {
859 ret = btrfs_reloc_clone_csums(inode, start,
864 if (disk_num_bytes < cur_alloc_size)
867 /* we're not doing compressed IO, don't unlock the first
868 * page (which the caller expects to stay locked), don't
869 * clear any dirty bits and don't set any writeback bits
871 * Do set the Private2 bit so we know this page was properly
872 * setup for writepage
874 op = unlock ? EXTENT_CLEAR_UNLOCK_PAGE : 0;
875 op |= EXTENT_CLEAR_UNLOCK | EXTENT_CLEAR_DELALLOC |
878 extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree,
879 start, start + ram_size - 1,
881 disk_num_bytes -= cur_alloc_size;
882 num_bytes -= cur_alloc_size;
883 alloc_hint = ins.objectid + ins.offset;
884 start += cur_alloc_size;
888 btrfs_end_transaction(trans, root);
894 * work queue call back to started compression on a file and pages
896 static noinline void async_cow_start(struct btrfs_work *work)
898 struct async_cow *async_cow;
900 async_cow = container_of(work, struct async_cow, work);
902 compress_file_range(async_cow->inode, async_cow->locked_page,
903 async_cow->start, async_cow->end, async_cow,
906 async_cow->inode = NULL;
910 * work queue call back to submit previously compressed pages
912 static noinline void async_cow_submit(struct btrfs_work *work)
914 struct async_cow *async_cow;
915 struct btrfs_root *root;
916 unsigned long nr_pages;
918 async_cow = container_of(work, struct async_cow, work);
920 root = async_cow->root;
921 nr_pages = (async_cow->end - async_cow->start + PAGE_CACHE_SIZE) >>
924 atomic_sub(nr_pages, &root->fs_info->async_delalloc_pages);
926 if (atomic_read(&root->fs_info->async_delalloc_pages) <
928 waitqueue_active(&root->fs_info->async_submit_wait))
929 wake_up(&root->fs_info->async_submit_wait);
931 if (async_cow->inode)
932 submit_compressed_extents(async_cow->inode, async_cow);
935 static noinline void async_cow_free(struct btrfs_work *work)
937 struct async_cow *async_cow;
938 async_cow = container_of(work, struct async_cow, work);
942 static int cow_file_range_async(struct inode *inode, struct page *locked_page,
943 u64 start, u64 end, int *page_started,
944 unsigned long *nr_written)
946 struct async_cow *async_cow;
947 struct btrfs_root *root = BTRFS_I(inode)->root;
948 unsigned long nr_pages;
950 int limit = 10 * 1024 * 1042;
952 clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED,
953 1, 0, NULL, GFP_NOFS);
954 while (start < end) {
955 async_cow = kmalloc(sizeof(*async_cow), GFP_NOFS);
957 async_cow->inode = inode;
958 async_cow->root = root;
959 async_cow->locked_page = locked_page;
960 async_cow->start = start;
962 if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS)
965 cur_end = min(end, start + 512 * 1024 - 1);
967 async_cow->end = cur_end;
968 INIT_LIST_HEAD(&async_cow->extents);
970 async_cow->work.func = async_cow_start;
971 async_cow->work.ordered_func = async_cow_submit;
972 async_cow->work.ordered_free = async_cow_free;
973 async_cow->work.flags = 0;
975 nr_pages = (cur_end - start + PAGE_CACHE_SIZE) >>
977 atomic_add(nr_pages, &root->fs_info->async_delalloc_pages);
979 btrfs_queue_worker(&root->fs_info->delalloc_workers,
982 if (atomic_read(&root->fs_info->async_delalloc_pages) > limit) {
983 wait_event(root->fs_info->async_submit_wait,
984 (atomic_read(&root->fs_info->async_delalloc_pages) <
988 while (atomic_read(&root->fs_info->async_submit_draining) &&
989 atomic_read(&root->fs_info->async_delalloc_pages)) {
990 wait_event(root->fs_info->async_submit_wait,
991 (atomic_read(&root->fs_info->async_delalloc_pages) ==
995 *nr_written += nr_pages;
1002 static noinline int csum_exist_in_range(struct btrfs_root *root,
1003 u64 bytenr, u64 num_bytes)
1006 struct btrfs_ordered_sum *sums;
1009 ret = btrfs_lookup_csums_range(root->fs_info->csum_root, bytenr,
1010 bytenr + num_bytes - 1, &list, 0);
1011 if (ret == 0 && list_empty(&list))
1014 while (!list_empty(&list)) {
1015 sums = list_entry(list.next, struct btrfs_ordered_sum, list);
1016 list_del(&sums->list);
1023 * when nowcow writeback call back. This checks for snapshots or COW copies
1024 * of the extents that exist in the file, and COWs the file as required.
1026 * If no cow copies or snapshots exist, we write directly to the existing
1029 static noinline int run_delalloc_nocow(struct inode *inode,
1030 struct page *locked_page,
1031 u64 start, u64 end, int *page_started, int force,
1032 unsigned long *nr_written)
1034 struct btrfs_root *root = BTRFS_I(inode)->root;
1035 struct btrfs_trans_handle *trans;
1036 struct extent_buffer *leaf;
1037 struct btrfs_path *path;
1038 struct btrfs_file_extent_item *fi;
1039 struct btrfs_key found_key;
1051 bool nolock = false;
1053 path = btrfs_alloc_path();
1055 if (root == root->fs_info->tree_root) {
1057 trans = btrfs_join_transaction_nolock(root, 1);
1059 trans = btrfs_join_transaction(root, 1);
1061 BUG_ON(IS_ERR(trans));
1063 cow_start = (u64)-1;
1066 ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino,
1069 if (ret > 0 && path->slots[0] > 0 && check_prev) {
1070 leaf = path->nodes[0];
1071 btrfs_item_key_to_cpu(leaf, &found_key,
1072 path->slots[0] - 1);
1073 if (found_key.objectid == inode->i_ino &&
1074 found_key.type == BTRFS_EXTENT_DATA_KEY)
1079 leaf = path->nodes[0];
1080 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
1081 ret = btrfs_next_leaf(root, path);
1086 leaf = path->nodes[0];
1092 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1094 if (found_key.objectid > inode->i_ino ||
1095 found_key.type > BTRFS_EXTENT_DATA_KEY ||
1096 found_key.offset > end)
1099 if (found_key.offset > cur_offset) {
1100 extent_end = found_key.offset;
1105 fi = btrfs_item_ptr(leaf, path->slots[0],
1106 struct btrfs_file_extent_item);
1107 extent_type = btrfs_file_extent_type(leaf, fi);
1109 if (extent_type == BTRFS_FILE_EXTENT_REG ||
1110 extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
1111 disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
1112 extent_offset = btrfs_file_extent_offset(leaf, fi);
1113 extent_end = found_key.offset +
1114 btrfs_file_extent_num_bytes(leaf, fi);
1115 if (extent_end <= start) {
1119 if (disk_bytenr == 0)
1121 if (btrfs_file_extent_compression(leaf, fi) ||
1122 btrfs_file_extent_encryption(leaf, fi) ||
1123 btrfs_file_extent_other_encoding(leaf, fi))
1125 if (extent_type == BTRFS_FILE_EXTENT_REG && !force)
1127 if (btrfs_extent_readonly(root, disk_bytenr))
1129 if (btrfs_cross_ref_exist(trans, root, inode->i_ino,
1131 extent_offset, disk_bytenr))
1133 disk_bytenr += extent_offset;
1134 disk_bytenr += cur_offset - found_key.offset;
1135 num_bytes = min(end + 1, extent_end) - cur_offset;
1137 * force cow if csum exists in the range.
1138 * this ensure that csum for a given extent are
1139 * either valid or do not exist.
1141 if (csum_exist_in_range(root, disk_bytenr, num_bytes))
1144 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
1145 extent_end = found_key.offset +
1146 btrfs_file_extent_inline_len(leaf, fi);
1147 extent_end = ALIGN(extent_end, root->sectorsize);
1152 if (extent_end <= start) {
1157 if (cow_start == (u64)-1)
1158 cow_start = cur_offset;
1159 cur_offset = extent_end;
1160 if (cur_offset > end)
1166 btrfs_release_path(root, path);
1167 if (cow_start != (u64)-1) {
1168 ret = cow_file_range(inode, locked_page, cow_start,
1169 found_key.offset - 1, page_started,
1172 cow_start = (u64)-1;
1175 if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
1176 struct extent_map *em;
1177 struct extent_map_tree *em_tree;
1178 em_tree = &BTRFS_I(inode)->extent_tree;
1179 em = alloc_extent_map(GFP_NOFS);
1181 em->start = cur_offset;
1182 em->orig_start = em->start;
1183 em->len = num_bytes;
1184 em->block_len = num_bytes;
1185 em->block_start = disk_bytenr;
1186 em->bdev = root->fs_info->fs_devices->latest_bdev;
1187 set_bit(EXTENT_FLAG_PINNED, &em->flags);
1189 write_lock(&em_tree->lock);
1190 ret = add_extent_mapping(em_tree, em);
1191 write_unlock(&em_tree->lock);
1192 if (ret != -EEXIST) {
1193 free_extent_map(em);
1196 btrfs_drop_extent_cache(inode, em->start,
1197 em->start + em->len - 1, 0);
1199 type = BTRFS_ORDERED_PREALLOC;
1201 type = BTRFS_ORDERED_NOCOW;
1204 ret = btrfs_add_ordered_extent(inode, cur_offset, disk_bytenr,
1205 num_bytes, num_bytes, type);
1208 if (root->root_key.objectid ==
1209 BTRFS_DATA_RELOC_TREE_OBJECTID) {
1210 ret = btrfs_reloc_clone_csums(inode, cur_offset,
1215 extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree,
1216 cur_offset, cur_offset + num_bytes - 1,
1217 locked_page, EXTENT_CLEAR_UNLOCK_PAGE |
1218 EXTENT_CLEAR_UNLOCK | EXTENT_CLEAR_DELALLOC |
1219 EXTENT_SET_PRIVATE2);
1220 cur_offset = extent_end;
1221 if (cur_offset > end)
1224 btrfs_release_path(root, path);
1226 if (cur_offset <= end && cow_start == (u64)-1)
1227 cow_start = cur_offset;
1228 if (cow_start != (u64)-1) {
1229 ret = cow_file_range(inode, locked_page, cow_start, end,
1230 page_started, nr_written, 1);
1235 ret = btrfs_end_transaction_nolock(trans, root);
1238 ret = btrfs_end_transaction(trans, root);
1241 btrfs_free_path(path);
1246 * extent_io.c call back to do delayed allocation processing
1248 static int run_delalloc_range(struct inode *inode, struct page *locked_page,
1249 u64 start, u64 end, int *page_started,
1250 unsigned long *nr_written)
1253 struct btrfs_root *root = BTRFS_I(inode)->root;
1255 if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW)
1256 ret = run_delalloc_nocow(inode, locked_page, start, end,
1257 page_started, 1, nr_written);
1258 else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC)
1259 ret = run_delalloc_nocow(inode, locked_page, start, end,
1260 page_started, 0, nr_written);
1261 else if (!btrfs_test_opt(root, COMPRESS) &&
1262 !(BTRFS_I(inode)->force_compress) &&
1263 !(BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS))
1264 ret = cow_file_range(inode, locked_page, start, end,
1265 page_started, nr_written, 1);
1267 ret = cow_file_range_async(inode, locked_page, start, end,
1268 page_started, nr_written);
1272 static int btrfs_split_extent_hook(struct inode *inode,
1273 struct extent_state *orig, u64 split)
1275 /* not delalloc, ignore it */
1276 if (!(orig->state & EXTENT_DELALLOC))
1279 atomic_inc(&BTRFS_I(inode)->outstanding_extents);
1284 * extent_io.c merge_extent_hook, used to track merged delayed allocation
1285 * extents so we can keep track of new extents that are just merged onto old
1286 * extents, such as when we are doing sequential writes, so we can properly
1287 * account for the metadata space we'll need.
1289 static int btrfs_merge_extent_hook(struct inode *inode,
1290 struct extent_state *new,
1291 struct extent_state *other)
1293 /* not delalloc, ignore it */
1294 if (!(other->state & EXTENT_DELALLOC))
1297 atomic_dec(&BTRFS_I(inode)->outstanding_extents);
1302 * extent_io.c set_bit_hook, used to track delayed allocation
1303 * bytes in this file, and to maintain the list of inodes that
1304 * have pending delalloc work to be done.
1306 static int btrfs_set_bit_hook(struct inode *inode,
1307 struct extent_state *state, int *bits)
1311 * set_bit and clear bit hooks normally require _irqsave/restore
1312 * but in this case, we are only testeing for the DELALLOC
1313 * bit, which is only set or cleared with irqs on
1315 if (!(state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) {
1316 struct btrfs_root *root = BTRFS_I(inode)->root;
1317 u64 len = state->end + 1 - state->start;
1318 int do_list = (root->root_key.objectid !=
1319 BTRFS_ROOT_TREE_OBJECTID);
1321 if (*bits & EXTENT_FIRST_DELALLOC)
1322 *bits &= ~EXTENT_FIRST_DELALLOC;
1324 atomic_inc(&BTRFS_I(inode)->outstanding_extents);
1326 spin_lock(&root->fs_info->delalloc_lock);
1327 BTRFS_I(inode)->delalloc_bytes += len;
1328 root->fs_info->delalloc_bytes += len;
1329 if (do_list && list_empty(&BTRFS_I(inode)->delalloc_inodes)) {
1330 list_add_tail(&BTRFS_I(inode)->delalloc_inodes,
1331 &root->fs_info->delalloc_inodes);
1333 spin_unlock(&root->fs_info->delalloc_lock);
1339 * extent_io.c clear_bit_hook, see set_bit_hook for why
1341 static int btrfs_clear_bit_hook(struct inode *inode,
1342 struct extent_state *state, int *bits)
1345 * set_bit and clear bit hooks normally require _irqsave/restore
1346 * but in this case, we are only testeing for the DELALLOC
1347 * bit, which is only set or cleared with irqs on
1349 if ((state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) {
1350 struct btrfs_root *root = BTRFS_I(inode)->root;
1351 u64 len = state->end + 1 - state->start;
1352 int do_list = (root->root_key.objectid !=
1353 BTRFS_ROOT_TREE_OBJECTID);
1355 if (*bits & EXTENT_FIRST_DELALLOC)
1356 *bits &= ~EXTENT_FIRST_DELALLOC;
1357 else if (!(*bits & EXTENT_DO_ACCOUNTING))
1358 atomic_dec(&BTRFS_I(inode)->outstanding_extents);
1360 if (*bits & EXTENT_DO_ACCOUNTING)
1361 btrfs_delalloc_release_metadata(inode, len);
1363 if (root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID
1365 btrfs_free_reserved_data_space(inode, len);
1367 spin_lock(&root->fs_info->delalloc_lock);
1368 root->fs_info->delalloc_bytes -= len;
1369 BTRFS_I(inode)->delalloc_bytes -= len;
1371 if (do_list && BTRFS_I(inode)->delalloc_bytes == 0 &&
1372 !list_empty(&BTRFS_I(inode)->delalloc_inodes)) {
1373 list_del_init(&BTRFS_I(inode)->delalloc_inodes);
1375 spin_unlock(&root->fs_info->delalloc_lock);
1381 * extent_io.c merge_bio_hook, this must check the chunk tree to make sure
1382 * we don't create bios that span stripes or chunks
1384 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
1385 size_t size, struct bio *bio,
1386 unsigned long bio_flags)
1388 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
1389 struct btrfs_mapping_tree *map_tree;
1390 u64 logical = (u64)bio->bi_sector << 9;
1395 if (bio_flags & EXTENT_BIO_COMPRESSED)
1398 length = bio->bi_size;
1399 map_tree = &root->fs_info->mapping_tree;
1400 map_length = length;
1401 ret = btrfs_map_block(map_tree, READ, logical,
1402 &map_length, NULL, 0);
1404 if (map_length < length + size)
1410 * in order to insert checksums into the metadata in large chunks,
1411 * we wait until bio submission time. All the pages in the bio are
1412 * checksummed and sums are attached onto the ordered extent record.
1414 * At IO completion time the cums attached on the ordered extent record
1415 * are inserted into the btree
1417 static int __btrfs_submit_bio_start(struct inode *inode, int rw,
1418 struct bio *bio, int mirror_num,
1419 unsigned long bio_flags,
1422 struct btrfs_root *root = BTRFS_I(inode)->root;
1425 ret = btrfs_csum_one_bio(root, inode, bio, 0, 0);
1431 * in order to insert checksums into the metadata in large chunks,
1432 * we wait until bio submission time. All the pages in the bio are
1433 * checksummed and sums are attached onto the ordered extent record.
1435 * At IO completion time the cums attached on the ordered extent record
1436 * are inserted into the btree
1438 static int __btrfs_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
1439 int mirror_num, unsigned long bio_flags,
1442 struct btrfs_root *root = BTRFS_I(inode)->root;
1443 return btrfs_map_bio(root, rw, bio, mirror_num, 1);
1447 * extent_io.c submission hook. This does the right thing for csum calculation
1448 * on write, or reading the csums from the tree before a read
1450 static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
1451 int mirror_num, unsigned long bio_flags,
1454 struct btrfs_root *root = BTRFS_I(inode)->root;
1458 skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
1460 if (root == root->fs_info->tree_root)
1461 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 2);
1463 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
1466 if (!(rw & REQ_WRITE)) {
1467 if (bio_flags & EXTENT_BIO_COMPRESSED) {
1468 return btrfs_submit_compressed_read(inode, bio,
1469 mirror_num, bio_flags);
1470 } else if (!skip_sum) {
1471 ret = btrfs_lookup_bio_sums(root, inode, bio, NULL);
1476 } else if (!skip_sum) {
1477 /* csum items have already been cloned */
1478 if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID)
1480 /* we're doing a write, do the async checksumming */
1481 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
1482 inode, rw, bio, mirror_num,
1483 bio_flags, bio_offset,
1484 __btrfs_submit_bio_start,
1485 __btrfs_submit_bio_done);
1489 return btrfs_map_bio(root, rw, bio, mirror_num, 0);
1493 * given a list of ordered sums record them in the inode. This happens
1494 * at IO completion time based on sums calculated at bio submission time.
1496 static noinline int add_pending_csums(struct btrfs_trans_handle *trans,
1497 struct inode *inode, u64 file_offset,
1498 struct list_head *list)
1500 struct btrfs_ordered_sum *sum;
1502 btrfs_set_trans_block_group(trans, inode);
1504 list_for_each_entry(sum, list, list) {
1505 btrfs_csum_file_blocks(trans,
1506 BTRFS_I(inode)->root->fs_info->csum_root, sum);
1511 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
1512 struct extent_state **cached_state)
1514 if ((end & (PAGE_CACHE_SIZE - 1)) == 0)
1516 return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end,
1517 cached_state, GFP_NOFS);
1520 /* see btrfs_writepage_start_hook for details on why this is required */
1521 struct btrfs_writepage_fixup {
1523 struct btrfs_work work;
1526 static void btrfs_writepage_fixup_worker(struct btrfs_work *work)
1528 struct btrfs_writepage_fixup *fixup;
1529 struct btrfs_ordered_extent *ordered;
1530 struct extent_state *cached_state = NULL;
1532 struct inode *inode;
1536 fixup = container_of(work, struct btrfs_writepage_fixup, work);
1540 if (!page->mapping || !PageDirty(page) || !PageChecked(page)) {
1541 ClearPageChecked(page);
1545 inode = page->mapping->host;
1546 page_start = page_offset(page);
1547 page_end = page_offset(page) + PAGE_CACHE_SIZE - 1;
1549 lock_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end, 0,
1550 &cached_state, GFP_NOFS);
1552 /* already ordered? We're done */
1553 if (PagePrivate2(page))
1556 ordered = btrfs_lookup_ordered_extent(inode, page_start);
1558 unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start,
1559 page_end, &cached_state, GFP_NOFS);
1561 btrfs_start_ordered_extent(inode, ordered, 1);
1566 btrfs_set_extent_delalloc(inode, page_start, page_end, &cached_state);
1567 ClearPageChecked(page);
1569 unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, page_end,
1570 &cached_state, GFP_NOFS);
1573 page_cache_release(page);
1578 * There are a few paths in the higher layers of the kernel that directly
1579 * set the page dirty bit without asking the filesystem if it is a
1580 * good idea. This causes problems because we want to make sure COW
1581 * properly happens and the data=ordered rules are followed.
1583 * In our case any range that doesn't have the ORDERED bit set
1584 * hasn't been properly setup for IO. We kick off an async process
1585 * to fix it up. The async helper will wait for ordered extents, set
1586 * the delalloc bit and make it safe to write the page.
1588 static int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end)
1590 struct inode *inode = page->mapping->host;
1591 struct btrfs_writepage_fixup *fixup;
1592 struct btrfs_root *root = BTRFS_I(inode)->root;
1594 /* this page is properly in the ordered list */
1595 if (TestClearPagePrivate2(page))
1598 if (PageChecked(page))
1601 fixup = kzalloc(sizeof(*fixup), GFP_NOFS);
1605 SetPageChecked(page);
1606 page_cache_get(page);
1607 fixup->work.func = btrfs_writepage_fixup_worker;
1609 btrfs_queue_worker(&root->fs_info->fixup_workers, &fixup->work);
1613 static int insert_reserved_file_extent(struct btrfs_trans_handle *trans,
1614 struct inode *inode, u64 file_pos,
1615 u64 disk_bytenr, u64 disk_num_bytes,
1616 u64 num_bytes, u64 ram_bytes,
1617 u8 compression, u8 encryption,
1618 u16 other_encoding, int extent_type)
1620 struct btrfs_root *root = BTRFS_I(inode)->root;
1621 struct btrfs_file_extent_item *fi;
1622 struct btrfs_path *path;
1623 struct extent_buffer *leaf;
1624 struct btrfs_key ins;
1628 path = btrfs_alloc_path();
1631 path->leave_spinning = 1;
1634 * we may be replacing one extent in the tree with another.
1635 * The new extent is pinned in the extent map, and we don't want
1636 * to drop it from the cache until it is completely in the btree.
1638 * So, tell btrfs_drop_extents to leave this extent in the cache.
1639 * the caller is expected to unpin it and allow it to be merged
1642 ret = btrfs_drop_extents(trans, inode, file_pos, file_pos + num_bytes,
1646 ins.objectid = inode->i_ino;
1647 ins.offset = file_pos;
1648 ins.type = BTRFS_EXTENT_DATA_KEY;
1649 ret = btrfs_insert_empty_item(trans, root, path, &ins, sizeof(*fi));
1651 leaf = path->nodes[0];
1652 fi = btrfs_item_ptr(leaf, path->slots[0],
1653 struct btrfs_file_extent_item);
1654 btrfs_set_file_extent_generation(leaf, fi, trans->transid);
1655 btrfs_set_file_extent_type(leaf, fi, extent_type);
1656 btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr);
1657 btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_num_bytes);
1658 btrfs_set_file_extent_offset(leaf, fi, 0);
1659 btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes);
1660 btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes);
1661 btrfs_set_file_extent_compression(leaf, fi, compression);
1662 btrfs_set_file_extent_encryption(leaf, fi, encryption);
1663 btrfs_set_file_extent_other_encoding(leaf, fi, other_encoding);
1665 btrfs_unlock_up_safe(path, 1);
1666 btrfs_set_lock_blocking(leaf);
1668 btrfs_mark_buffer_dirty(leaf);
1670 inode_add_bytes(inode, num_bytes);
1672 ins.objectid = disk_bytenr;
1673 ins.offset = disk_num_bytes;
1674 ins.type = BTRFS_EXTENT_ITEM_KEY;
1675 ret = btrfs_alloc_reserved_file_extent(trans, root,
1676 root->root_key.objectid,
1677 inode->i_ino, file_pos, &ins);
1679 btrfs_free_path(path);
1685 * helper function for btrfs_finish_ordered_io, this
1686 * just reads in some of the csum leaves to prime them into ram
1687 * before we start the transaction. It limits the amount of btree
1688 * reads required while inside the transaction.
1690 /* as ordered data IO finishes, this gets called so we can finish
1691 * an ordered extent if the range of bytes in the file it covers are
1694 static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end)
1696 struct btrfs_root *root = BTRFS_I(inode)->root;
1697 struct btrfs_trans_handle *trans = NULL;
1698 struct btrfs_ordered_extent *ordered_extent = NULL;
1699 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1700 struct extent_state *cached_state = NULL;
1701 int compress_type = 0;
1703 bool nolock = false;
1705 ret = btrfs_dec_test_ordered_pending(inode, &ordered_extent, start,
1709 BUG_ON(!ordered_extent);
1711 nolock = (root == root->fs_info->tree_root);
1713 if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) {
1714 BUG_ON(!list_empty(&ordered_extent->list));
1715 ret = btrfs_ordered_update_i_size(inode, 0, ordered_extent);
1718 trans = btrfs_join_transaction_nolock(root, 1);
1720 trans = btrfs_join_transaction(root, 1);
1721 BUG_ON(IS_ERR(trans));
1722 btrfs_set_trans_block_group(trans, inode);
1723 trans->block_rsv = &root->fs_info->delalloc_block_rsv;
1724 ret = btrfs_update_inode(trans, root, inode);
1730 lock_extent_bits(io_tree, ordered_extent->file_offset,
1731 ordered_extent->file_offset + ordered_extent->len - 1,
1732 0, &cached_state, GFP_NOFS);
1735 trans = btrfs_join_transaction_nolock(root, 1);
1737 trans = btrfs_join_transaction(root, 1);
1738 BUG_ON(IS_ERR(trans));
1739 btrfs_set_trans_block_group(trans, inode);
1740 trans->block_rsv = &root->fs_info->delalloc_block_rsv;
1742 if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags))
1743 compress_type = ordered_extent->compress_type;
1744 if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) {
1745 BUG_ON(compress_type);
1746 ret = btrfs_mark_extent_written(trans, inode,
1747 ordered_extent->file_offset,
1748 ordered_extent->file_offset +
1749 ordered_extent->len);
1752 BUG_ON(root == root->fs_info->tree_root);
1753 ret = insert_reserved_file_extent(trans, inode,
1754 ordered_extent->file_offset,
1755 ordered_extent->start,
1756 ordered_extent->disk_len,
1757 ordered_extent->len,
1758 ordered_extent->len,
1759 compress_type, 0, 0,
1760 BTRFS_FILE_EXTENT_REG);
1761 unpin_extent_cache(&BTRFS_I(inode)->extent_tree,
1762 ordered_extent->file_offset,
1763 ordered_extent->len);
1766 unlock_extent_cached(io_tree, ordered_extent->file_offset,
1767 ordered_extent->file_offset +
1768 ordered_extent->len - 1, &cached_state, GFP_NOFS);
1770 add_pending_csums(trans, inode, ordered_extent->file_offset,
1771 &ordered_extent->list);
1773 ret = btrfs_ordered_update_i_size(inode, 0, ordered_extent);
1775 ret = btrfs_update_inode(trans, root, inode);
1782 btrfs_end_transaction_nolock(trans, root);
1784 btrfs_delalloc_release_metadata(inode, ordered_extent->len);
1786 btrfs_end_transaction(trans, root);
1790 btrfs_put_ordered_extent(ordered_extent);
1791 /* once for the tree */
1792 btrfs_put_ordered_extent(ordered_extent);
1797 static int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end,
1798 struct extent_state *state, int uptodate)
1800 trace_btrfs_writepage_end_io_hook(page, start, end, uptodate);
1802 ClearPagePrivate2(page);
1803 return btrfs_finish_ordered_io(page->mapping->host, start, end);
1807 * When IO fails, either with EIO or csum verification fails, we
1808 * try other mirrors that might have a good copy of the data. This
1809 * io_failure_record is used to record state as we go through all the
1810 * mirrors. If another mirror has good data, the page is set up to date
1811 * and things continue. If a good mirror can't be found, the original
1812 * bio end_io callback is called to indicate things have failed.
1814 struct io_failure_record {
1819 unsigned long bio_flags;
1823 static int btrfs_io_failed_hook(struct bio *failed_bio,
1824 struct page *page, u64 start, u64 end,
1825 struct extent_state *state)
1827 struct io_failure_record *failrec = NULL;
1829 struct extent_map *em;
1830 struct inode *inode = page->mapping->host;
1831 struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
1832 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1839 ret = get_state_private(failure_tree, start, &private);
1841 failrec = kmalloc(sizeof(*failrec), GFP_NOFS);
1844 failrec->start = start;
1845 failrec->len = end - start + 1;
1846 failrec->last_mirror = 0;
1847 failrec->bio_flags = 0;
1849 read_lock(&em_tree->lock);
1850 em = lookup_extent_mapping(em_tree, start, failrec->len);
1851 if (em->start > start || em->start + em->len < start) {
1852 free_extent_map(em);
1855 read_unlock(&em_tree->lock);
1857 if (!em || IS_ERR(em)) {
1861 logical = start - em->start;
1862 logical = em->block_start + logical;
1863 if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) {
1864 logical = em->block_start;
1865 failrec->bio_flags = EXTENT_BIO_COMPRESSED;
1866 extent_set_compress_type(&failrec->bio_flags,
1869 failrec->logical = logical;
1870 free_extent_map(em);
1871 set_extent_bits(failure_tree, start, end, EXTENT_LOCKED |
1872 EXTENT_DIRTY, GFP_NOFS);
1873 set_state_private(failure_tree, start,
1874 (u64)(unsigned long)failrec);
1876 failrec = (struct io_failure_record *)(unsigned long)private;
1878 num_copies = btrfs_num_copies(
1879 &BTRFS_I(inode)->root->fs_info->mapping_tree,
1880 failrec->logical, failrec->len);
1881 failrec->last_mirror++;
1883 spin_lock(&BTRFS_I(inode)->io_tree.lock);
1884 state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree,
1887 if (state && state->start != failrec->start)
1889 spin_unlock(&BTRFS_I(inode)->io_tree.lock);
1891 if (!state || failrec->last_mirror > num_copies) {
1892 set_state_private(failure_tree, failrec->start, 0);
1893 clear_extent_bits(failure_tree, failrec->start,
1894 failrec->start + failrec->len - 1,
1895 EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS);
1899 bio = bio_alloc(GFP_NOFS, 1);
1900 bio->bi_private = state;
1901 bio->bi_end_io = failed_bio->bi_end_io;
1902 bio->bi_sector = failrec->logical >> 9;
1903 bio->bi_bdev = failed_bio->bi_bdev;
1906 bio_add_page(bio, page, failrec->len, start - page_offset(page));
1907 if (failed_bio->bi_rw & REQ_WRITE)
1912 ret = BTRFS_I(inode)->io_tree.ops->submit_bio_hook(inode, rw, bio,
1913 failrec->last_mirror,
1914 failrec->bio_flags, 0);
1919 * each time an IO finishes, we do a fast check in the IO failure tree
1920 * to see if we need to process or clean up an io_failure_record
1922 static int btrfs_clean_io_failures(struct inode *inode, u64 start)
1925 u64 private_failure;
1926 struct io_failure_record *failure;
1930 if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private,
1931 (u64)-1, 1, EXTENT_DIRTY, 0)) {
1932 ret = get_state_private(&BTRFS_I(inode)->io_failure_tree,
1933 start, &private_failure);
1935 failure = (struct io_failure_record *)(unsigned long)
1937 set_state_private(&BTRFS_I(inode)->io_failure_tree,
1939 clear_extent_bits(&BTRFS_I(inode)->io_failure_tree,
1941 failure->start + failure->len - 1,
1942 EXTENT_DIRTY | EXTENT_LOCKED,
1951 * when reads are done, we need to check csums to verify the data is correct
1952 * if there's a match, we allow the bio to finish. If not, we go through
1953 * the io_failure_record routines to find good copies
1955 static int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
1956 struct extent_state *state)
1958 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
1959 struct inode *inode = page->mapping->host;
1960 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1962 u64 private = ~(u32)0;
1964 struct btrfs_root *root = BTRFS_I(inode)->root;
1967 if (PageChecked(page)) {
1968 ClearPageChecked(page);
1972 if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)
1975 if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID &&
1976 test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1, NULL)) {
1977 clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM,
1982 if (state && state->start == start) {
1983 private = state->private;
1986 ret = get_state_private(io_tree, start, &private);
1988 kaddr = kmap_atomic(page, KM_USER0);
1992 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
1993 btrfs_csum_final(csum, (char *)&csum);
1994 if (csum != private)
1997 kunmap_atomic(kaddr, KM_USER0);
1999 /* if the io failure tree for this inode is non-empty,
2000 * check to see if we've recovered from a failed IO
2002 btrfs_clean_io_failures(inode, start);
2006 if (printk_ratelimit()) {
2007 printk(KERN_INFO "btrfs csum failed ino %lu off %llu csum %u "
2008 "private %llu\n", page->mapping->host->i_ino,
2009 (unsigned long long)start, csum,
2010 (unsigned long long)private);
2012 memset(kaddr + offset, 1, end - start + 1);
2013 flush_dcache_page(page);
2014 kunmap_atomic(kaddr, KM_USER0);
2020 struct delayed_iput {
2021 struct list_head list;
2022 struct inode *inode;
2025 void btrfs_add_delayed_iput(struct inode *inode)
2027 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
2028 struct delayed_iput *delayed;
2030 if (atomic_add_unless(&inode->i_count, -1, 1))
2033 delayed = kmalloc(sizeof(*delayed), GFP_NOFS | __GFP_NOFAIL);
2034 delayed->inode = inode;
2036 spin_lock(&fs_info->delayed_iput_lock);
2037 list_add_tail(&delayed->list, &fs_info->delayed_iputs);
2038 spin_unlock(&fs_info->delayed_iput_lock);
2041 void btrfs_run_delayed_iputs(struct btrfs_root *root)
2044 struct btrfs_fs_info *fs_info = root->fs_info;
2045 struct delayed_iput *delayed;
2048 spin_lock(&fs_info->delayed_iput_lock);
2049 empty = list_empty(&fs_info->delayed_iputs);
2050 spin_unlock(&fs_info->delayed_iput_lock);
2054 down_read(&root->fs_info->cleanup_work_sem);
2055 spin_lock(&fs_info->delayed_iput_lock);
2056 list_splice_init(&fs_info->delayed_iputs, &list);
2057 spin_unlock(&fs_info->delayed_iput_lock);
2059 while (!list_empty(&list)) {
2060 delayed = list_entry(list.next, struct delayed_iput, list);
2061 list_del(&delayed->list);
2062 iput(delayed->inode);
2065 up_read(&root->fs_info->cleanup_work_sem);
2069 * calculate extra metadata reservation when snapshotting a subvolume
2070 * contains orphan files.
2072 void btrfs_orphan_pre_snapshot(struct btrfs_trans_handle *trans,
2073 struct btrfs_pending_snapshot *pending,
2074 u64 *bytes_to_reserve)
2076 struct btrfs_root *root;
2077 struct btrfs_block_rsv *block_rsv;
2081 root = pending->root;
2082 if (!root->orphan_block_rsv || list_empty(&root->orphan_list))
2085 block_rsv = root->orphan_block_rsv;
2087 /* orphan block reservation for the snapshot */
2088 num_bytes = block_rsv->size;
2091 * after the snapshot is created, COWing tree blocks may use more
2092 * space than it frees. So we should make sure there is enough
2095 index = trans->transid & 0x1;
2096 if (block_rsv->reserved + block_rsv->freed[index] < block_rsv->size) {
2097 num_bytes += block_rsv->size -
2098 (block_rsv->reserved + block_rsv->freed[index]);
2101 *bytes_to_reserve += num_bytes;
2104 void btrfs_orphan_post_snapshot(struct btrfs_trans_handle *trans,
2105 struct btrfs_pending_snapshot *pending)
2107 struct btrfs_root *root = pending->root;
2108 struct btrfs_root *snap = pending->snap;
2109 struct btrfs_block_rsv *block_rsv;
2114 if (!root->orphan_block_rsv || list_empty(&root->orphan_list))
2117 /* refill source subvolume's orphan block reservation */
2118 block_rsv = root->orphan_block_rsv;
2119 index = trans->transid & 0x1;
2120 if (block_rsv->reserved + block_rsv->freed[index] < block_rsv->size) {
2121 num_bytes = block_rsv->size -
2122 (block_rsv->reserved + block_rsv->freed[index]);
2123 ret = btrfs_block_rsv_migrate(&pending->block_rsv,
2124 root->orphan_block_rsv,
2129 /* setup orphan block reservation for the snapshot */
2130 block_rsv = btrfs_alloc_block_rsv(snap);
2133 btrfs_add_durable_block_rsv(root->fs_info, block_rsv);
2134 snap->orphan_block_rsv = block_rsv;
2136 num_bytes = root->orphan_block_rsv->size;
2137 ret = btrfs_block_rsv_migrate(&pending->block_rsv,
2138 block_rsv, num_bytes);
2142 /* insert orphan item for the snapshot */
2143 WARN_ON(!root->orphan_item_inserted);
2144 ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root,
2145 snap->root_key.objectid);
2147 snap->orphan_item_inserted = 1;
2151 enum btrfs_orphan_cleanup_state {
2152 ORPHAN_CLEANUP_STARTED = 1,
2153 ORPHAN_CLEANUP_DONE = 2,
2157 * This is called in transaction commmit time. If there are no orphan
2158 * files in the subvolume, it removes orphan item and frees block_rsv
2161 void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
2162 struct btrfs_root *root)
2166 if (!list_empty(&root->orphan_list) ||
2167 root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE)
2170 if (root->orphan_item_inserted &&
2171 btrfs_root_refs(&root->root_item) > 0) {
2172 ret = btrfs_del_orphan_item(trans, root->fs_info->tree_root,
2173 root->root_key.objectid);
2175 root->orphan_item_inserted = 0;
2178 if (root->orphan_block_rsv) {
2179 WARN_ON(root->orphan_block_rsv->size > 0);
2180 btrfs_free_block_rsv(root, root->orphan_block_rsv);
2181 root->orphan_block_rsv = NULL;
2186 * This creates an orphan entry for the given inode in case something goes
2187 * wrong in the middle of an unlink/truncate.
2189 * NOTE: caller of this function should reserve 5 units of metadata for
2192 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode)
2194 struct btrfs_root *root = BTRFS_I(inode)->root;
2195 struct btrfs_block_rsv *block_rsv = NULL;
2200 if (!root->orphan_block_rsv) {
2201 block_rsv = btrfs_alloc_block_rsv(root);
2205 spin_lock(&root->orphan_lock);
2206 if (!root->orphan_block_rsv) {
2207 root->orphan_block_rsv = block_rsv;
2208 } else if (block_rsv) {
2209 btrfs_free_block_rsv(root, block_rsv);
2213 if (list_empty(&BTRFS_I(inode)->i_orphan)) {
2214 list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list);
2217 * For proper ENOSPC handling, we should do orphan
2218 * cleanup when mounting. But this introduces backward
2219 * compatibility issue.
2221 if (!xchg(&root->orphan_item_inserted, 1))
2229 if (!BTRFS_I(inode)->orphan_meta_reserved) {
2230 BTRFS_I(inode)->orphan_meta_reserved = 1;
2233 spin_unlock(&root->orphan_lock);
2236 btrfs_add_durable_block_rsv(root->fs_info, block_rsv);
2238 /* grab metadata reservation from transaction handle */
2240 ret = btrfs_orphan_reserve_metadata(trans, inode);
2244 /* insert an orphan item to track this unlinked/truncated file */
2246 ret = btrfs_insert_orphan_item(trans, root, inode->i_ino);
2250 /* insert an orphan item to track subvolume contains orphan files */
2252 ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root,
2253 root->root_key.objectid);
2260 * We have done the truncate/delete so we can go ahead and remove the orphan
2261 * item for this particular inode.
2263 int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode)
2265 struct btrfs_root *root = BTRFS_I(inode)->root;
2266 int delete_item = 0;
2267 int release_rsv = 0;
2270 spin_lock(&root->orphan_lock);
2271 if (!list_empty(&BTRFS_I(inode)->i_orphan)) {
2272 list_del_init(&BTRFS_I(inode)->i_orphan);
2276 if (BTRFS_I(inode)->orphan_meta_reserved) {
2277 BTRFS_I(inode)->orphan_meta_reserved = 0;
2280 spin_unlock(&root->orphan_lock);
2282 if (trans && delete_item) {
2283 ret = btrfs_del_orphan_item(trans, root, inode->i_ino);
2288 btrfs_orphan_release_metadata(inode);
2294 * this cleans up any orphans that may be left on the list from the last use
2297 int btrfs_orphan_cleanup(struct btrfs_root *root)
2299 struct btrfs_path *path;
2300 struct extent_buffer *leaf;
2301 struct btrfs_key key, found_key;
2302 struct btrfs_trans_handle *trans;
2303 struct inode *inode;
2304 int ret = 0, nr_unlink = 0, nr_truncate = 0;
2306 if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED))
2309 path = btrfs_alloc_path();
2316 key.objectid = BTRFS_ORPHAN_OBJECTID;
2317 btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY);
2318 key.offset = (u64)-1;
2321 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2326 * if ret == 0 means we found what we were searching for, which
2327 * is weird, but possible, so only screw with path if we didnt
2328 * find the key and see if we have stuff that matches
2332 if (path->slots[0] == 0)
2337 /* pull out the item */
2338 leaf = path->nodes[0];
2339 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2341 /* make sure the item matches what we want */
2342 if (found_key.objectid != BTRFS_ORPHAN_OBJECTID)
2344 if (btrfs_key_type(&found_key) != BTRFS_ORPHAN_ITEM_KEY)
2347 /* release the path since we're done with it */
2348 btrfs_release_path(root, path);
2351 * this is where we are basically btrfs_lookup, without the
2352 * crossing root thing. we store the inode number in the
2353 * offset of the orphan item.
2355 found_key.objectid = found_key.offset;
2356 found_key.type = BTRFS_INODE_ITEM_KEY;
2357 found_key.offset = 0;
2358 inode = btrfs_iget(root->fs_info->sb, &found_key, root, NULL);
2359 if (IS_ERR(inode)) {
2360 ret = PTR_ERR(inode);
2365 * add this inode to the orphan list so btrfs_orphan_del does
2366 * the proper thing when we hit it
2368 spin_lock(&root->orphan_lock);
2369 list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list);
2370 spin_unlock(&root->orphan_lock);
2373 * if this is a bad inode, means we actually succeeded in
2374 * removing the inode, but not the orphan record, which means
2375 * we need to manually delete the orphan since iput will just
2376 * do a destroy_inode
2378 if (is_bad_inode(inode)) {
2379 trans = btrfs_start_transaction(root, 0);
2380 if (IS_ERR(trans)) {
2381 ret = PTR_ERR(trans);
2384 btrfs_orphan_del(trans, inode);
2385 btrfs_end_transaction(trans, root);
2390 /* if we have links, this was a truncate, lets do that */
2391 if (inode->i_nlink) {
2392 if (!S_ISREG(inode->i_mode)) {
2398 ret = btrfs_truncate(inode);
2403 /* this will do delete_inode and everything for us */
2408 root->orphan_cleanup_state = ORPHAN_CLEANUP_DONE;
2410 if (root->orphan_block_rsv)
2411 btrfs_block_rsv_release(root, root->orphan_block_rsv,
2414 if (root->orphan_block_rsv || root->orphan_item_inserted) {
2415 trans = btrfs_join_transaction(root, 1);
2417 btrfs_end_transaction(trans, root);
2421 printk(KERN_INFO "btrfs: unlinked %d orphans\n", nr_unlink);
2423 printk(KERN_INFO "btrfs: truncated %d orphans\n", nr_truncate);
2427 printk(KERN_CRIT "btrfs: could not do orphan cleanup %d\n", ret);
2428 btrfs_free_path(path);
2433 * very simple check to peek ahead in the leaf looking for xattrs. If we
2434 * don't find any xattrs, we know there can't be any acls.
2436 * slot is the slot the inode is in, objectid is the objectid of the inode
2438 static noinline int acls_after_inode_item(struct extent_buffer *leaf,
2439 int slot, u64 objectid)
2441 u32 nritems = btrfs_header_nritems(leaf);
2442 struct btrfs_key found_key;
2446 while (slot < nritems) {
2447 btrfs_item_key_to_cpu(leaf, &found_key, slot);
2449 /* we found a different objectid, there must not be acls */
2450 if (found_key.objectid != objectid)
2453 /* we found an xattr, assume we've got an acl */
2454 if (found_key.type == BTRFS_XATTR_ITEM_KEY)
2458 * we found a key greater than an xattr key, there can't
2459 * be any acls later on
2461 if (found_key.type > BTRFS_XATTR_ITEM_KEY)
2468 * it goes inode, inode backrefs, xattrs, extents,
2469 * so if there are a ton of hard links to an inode there can
2470 * be a lot of backrefs. Don't waste time searching too hard,
2471 * this is just an optimization
2476 /* we hit the end of the leaf before we found an xattr or
2477 * something larger than an xattr. We have to assume the inode
2484 * read an inode from the btree into the in-memory inode
2486 static void btrfs_read_locked_inode(struct inode *inode)
2488 struct btrfs_path *path;
2489 struct extent_buffer *leaf;
2490 struct btrfs_inode_item *inode_item;
2491 struct btrfs_timespec *tspec;
2492 struct btrfs_root *root = BTRFS_I(inode)->root;
2493 struct btrfs_key location;
2495 u64 alloc_group_block;
2499 path = btrfs_alloc_path();
2501 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
2503 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
2507 leaf = path->nodes[0];
2508 inode_item = btrfs_item_ptr(leaf, path->slots[0],
2509 struct btrfs_inode_item);
2511 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
2512 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
2513 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
2514 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
2515 btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item));
2517 tspec = btrfs_inode_atime(inode_item);
2518 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
2519 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
2521 tspec = btrfs_inode_mtime(inode_item);
2522 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
2523 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
2525 tspec = btrfs_inode_ctime(inode_item);
2526 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
2527 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
2529 inode_set_bytes(inode, btrfs_inode_nbytes(leaf, inode_item));
2530 BTRFS_I(inode)->generation = btrfs_inode_generation(leaf, inode_item);
2531 BTRFS_I(inode)->sequence = btrfs_inode_sequence(leaf, inode_item);
2532 inode->i_generation = BTRFS_I(inode)->generation;
2534 rdev = btrfs_inode_rdev(leaf, inode_item);
2536 BTRFS_I(inode)->index_cnt = (u64)-1;
2537 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
2539 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
2542 * try to precache a NULL acl entry for files that don't have
2543 * any xattrs or acls
2545 maybe_acls = acls_after_inode_item(leaf, path->slots[0], inode->i_ino);
2547 cache_no_acl(inode);
2549 BTRFS_I(inode)->block_group = btrfs_find_block_group(root, 0,
2550 alloc_group_block, 0);
2551 btrfs_free_path(path);
2554 switch (inode->i_mode & S_IFMT) {
2556 inode->i_mapping->a_ops = &btrfs_aops;
2557 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
2558 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
2559 inode->i_fop = &btrfs_file_operations;
2560 inode->i_op = &btrfs_file_inode_operations;
2563 inode->i_fop = &btrfs_dir_file_operations;
2564 if (root == root->fs_info->tree_root)
2565 inode->i_op = &btrfs_dir_ro_inode_operations;
2567 inode->i_op = &btrfs_dir_inode_operations;
2570 inode->i_op = &btrfs_symlink_inode_operations;
2571 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2572 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
2575 inode->i_op = &btrfs_special_inode_operations;
2576 init_special_inode(inode, inode->i_mode, rdev);
2580 btrfs_update_iflags(inode);
2584 btrfs_free_path(path);
2585 make_bad_inode(inode);
2589 * given a leaf and an inode, copy the inode fields into the leaf
2591 static void fill_inode_item(struct btrfs_trans_handle *trans,
2592 struct extent_buffer *leaf,
2593 struct btrfs_inode_item *item,
2594 struct inode *inode)
2596 if (!leaf->map_token)
2597 map_private_extent_buffer(leaf, (unsigned long)item,
2598 sizeof(struct btrfs_inode_item),
2599 &leaf->map_token, &leaf->kaddr,
2600 &leaf->map_start, &leaf->map_len,
2603 btrfs_set_inode_uid(leaf, item, inode->i_uid);
2604 btrfs_set_inode_gid(leaf, item, inode->i_gid);
2605 btrfs_set_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size);
2606 btrfs_set_inode_mode(leaf, item, inode->i_mode);
2607 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
2609 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
2610 inode->i_atime.tv_sec);
2611 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
2612 inode->i_atime.tv_nsec);
2614 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
2615 inode->i_mtime.tv_sec);
2616 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
2617 inode->i_mtime.tv_nsec);
2619 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
2620 inode->i_ctime.tv_sec);
2621 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
2622 inode->i_ctime.tv_nsec);
2624 btrfs_set_inode_nbytes(leaf, item, inode_get_bytes(inode));
2625 btrfs_set_inode_generation(leaf, item, BTRFS_I(inode)->generation);
2626 btrfs_set_inode_sequence(leaf, item, BTRFS_I(inode)->sequence);
2627 btrfs_set_inode_transid(leaf, item, trans->transid);
2628 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
2629 btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
2630 btrfs_set_inode_block_group(leaf, item, BTRFS_I(inode)->block_group);
2632 if (leaf->map_token) {
2633 unmap_extent_buffer(leaf, leaf->map_token, KM_USER1);
2634 leaf->map_token = NULL;
2639 * copy everything in the in-memory inode into the btree.
2641 noinline int btrfs_update_inode(struct btrfs_trans_handle *trans,
2642 struct btrfs_root *root, struct inode *inode)
2644 struct btrfs_inode_item *inode_item;
2645 struct btrfs_path *path;
2646 struct extent_buffer *leaf;
2649 path = btrfs_alloc_path();
2651 path->leave_spinning = 1;
2652 ret = btrfs_lookup_inode(trans, root, path,
2653 &BTRFS_I(inode)->location, 1);
2660 btrfs_unlock_up_safe(path, 1);
2661 leaf = path->nodes[0];
2662 inode_item = btrfs_item_ptr(leaf, path->slots[0],
2663 struct btrfs_inode_item);
2665 fill_inode_item(trans, leaf, inode_item, inode);
2666 btrfs_mark_buffer_dirty(leaf);
2667 btrfs_set_inode_last_trans(trans, inode);
2670 btrfs_free_path(path);
2676 * unlink helper that gets used here in inode.c and in the tree logging
2677 * recovery code. It remove a link in a directory with a given name, and
2678 * also drops the back refs in the inode to the directory
2680 static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans,
2681 struct btrfs_root *root,
2682 struct inode *dir, struct inode *inode,
2683 const char *name, int name_len)
2685 struct btrfs_path *path;
2687 struct extent_buffer *leaf;
2688 struct btrfs_dir_item *di;
2689 struct btrfs_key key;
2692 path = btrfs_alloc_path();
2698 path->leave_spinning = 1;
2699 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
2700 name, name_len, -1);
2709 leaf = path->nodes[0];
2710 btrfs_dir_item_key_to_cpu(leaf, di, &key);
2711 ret = btrfs_delete_one_dir_name(trans, root, path, di);
2714 btrfs_release_path(root, path);
2716 ret = btrfs_del_inode_ref(trans, root, name, name_len,
2718 dir->i_ino, &index);
2720 printk(KERN_INFO "btrfs failed to delete reference to %.*s, "
2721 "inode %lu parent %lu\n", name_len, name,
2722 inode->i_ino, dir->i_ino);
2726 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
2727 index, name, name_len, -1);
2736 ret = btrfs_delete_one_dir_name(trans, root, path, di);
2737 btrfs_release_path(root, path);
2739 ret = btrfs_del_inode_ref_in_log(trans, root, name, name_len,
2741 BUG_ON(ret != 0 && ret != -ENOENT);
2743 ret = btrfs_del_dir_entries_in_log(trans, root, name, name_len,
2748 btrfs_free_path(path);
2752 btrfs_i_size_write(dir, dir->i_size - name_len * 2);
2753 inode->i_ctime = dir->i_mtime = dir->i_ctime = CURRENT_TIME;
2754 btrfs_update_inode(trans, root, dir);
2759 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
2760 struct btrfs_root *root,
2761 struct inode *dir, struct inode *inode,
2762 const char *name, int name_len)
2765 ret = __btrfs_unlink_inode(trans, root, dir, inode, name, name_len);
2767 btrfs_drop_nlink(inode);
2768 ret = btrfs_update_inode(trans, root, inode);
2774 /* helper to check if there is any shared block in the path */
2775 static int check_path_shared(struct btrfs_root *root,
2776 struct btrfs_path *path)
2778 struct extent_buffer *eb;
2782 for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
2785 if (!path->nodes[level])
2787 eb = path->nodes[level];
2788 if (!btrfs_block_can_be_shared(root, eb))
2790 ret = btrfs_lookup_extent_info(NULL, root, eb->start, eb->len,
2799 * helper to start transaction for unlink and rmdir.
2801 * unlink and rmdir are special in btrfs, they do not always free space.
2802 * so in enospc case, we should make sure they will free space before
2803 * allowing them to use the global metadata reservation.
2805 static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir,
2806 struct dentry *dentry)
2808 struct btrfs_trans_handle *trans;
2809 struct btrfs_root *root = BTRFS_I(dir)->root;
2810 struct btrfs_path *path;
2811 struct btrfs_inode_ref *ref;
2812 struct btrfs_dir_item *di;
2813 struct inode *inode = dentry->d_inode;
2819 trans = btrfs_start_transaction(root, 10);
2820 if (!IS_ERR(trans) || PTR_ERR(trans) != -ENOSPC)
2823 if (inode->i_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
2824 return ERR_PTR(-ENOSPC);
2826 /* check if there is someone else holds reference */
2827 if (S_ISDIR(inode->i_mode) && atomic_read(&inode->i_count) > 1)
2828 return ERR_PTR(-ENOSPC);
2830 if (atomic_read(&inode->i_count) > 2)
2831 return ERR_PTR(-ENOSPC);
2833 if (xchg(&root->fs_info->enospc_unlink, 1))
2834 return ERR_PTR(-ENOSPC);
2836 path = btrfs_alloc_path();
2838 root->fs_info->enospc_unlink = 0;
2839 return ERR_PTR(-ENOMEM);
2842 trans = btrfs_start_transaction(root, 0);
2843 if (IS_ERR(trans)) {
2844 btrfs_free_path(path);
2845 root->fs_info->enospc_unlink = 0;
2849 path->skip_locking = 1;
2850 path->search_commit_root = 1;
2852 ret = btrfs_lookup_inode(trans, root, path,
2853 &BTRFS_I(dir)->location, 0);
2859 if (check_path_shared(root, path))
2864 btrfs_release_path(root, path);
2866 ret = btrfs_lookup_inode(trans, root, path,
2867 &BTRFS_I(inode)->location, 0);
2873 if (check_path_shared(root, path))
2878 btrfs_release_path(root, path);
2880 if (ret == 0 && S_ISREG(inode->i_mode)) {
2881 ret = btrfs_lookup_file_extent(trans, root, path,
2882 inode->i_ino, (u64)-1, 0);
2888 if (check_path_shared(root, path))
2890 btrfs_release_path(root, path);
2898 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
2899 dentry->d_name.name, dentry->d_name.len, 0);
2905 if (check_path_shared(root, path))
2911 btrfs_release_path(root, path);
2913 ref = btrfs_lookup_inode_ref(trans, root, path,
2914 dentry->d_name.name, dentry->d_name.len,
2915 inode->i_ino, dir->i_ino, 0);
2921 if (check_path_shared(root, path))
2923 index = btrfs_inode_ref_index(path->nodes[0], ref);
2924 btrfs_release_path(root, path);
2926 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, index,
2927 dentry->d_name.name, dentry->d_name.len, 0);
2932 BUG_ON(ret == -ENOENT);
2933 if (check_path_shared(root, path))
2938 btrfs_free_path(path);
2940 btrfs_end_transaction(trans, root);
2941 root->fs_info->enospc_unlink = 0;
2942 return ERR_PTR(err);
2945 trans->block_rsv = &root->fs_info->global_block_rsv;
2949 static void __unlink_end_trans(struct btrfs_trans_handle *trans,
2950 struct btrfs_root *root)
2952 if (trans->block_rsv == &root->fs_info->global_block_rsv) {
2953 BUG_ON(!root->fs_info->enospc_unlink);
2954 root->fs_info->enospc_unlink = 0;
2956 btrfs_end_transaction_throttle(trans, root);
2959 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
2961 struct btrfs_root *root = BTRFS_I(dir)->root;
2962 struct btrfs_trans_handle *trans;
2963 struct inode *inode = dentry->d_inode;
2965 unsigned long nr = 0;
2967 trans = __unlink_start_trans(dir, dentry);
2969 return PTR_ERR(trans);
2971 btrfs_set_trans_block_group(trans, dir);
2973 btrfs_record_unlink_dir(trans, dir, dentry->d_inode, 0);
2975 ret = btrfs_unlink_inode(trans, root, dir, dentry->d_inode,
2976 dentry->d_name.name, dentry->d_name.len);
2979 if (inode->i_nlink == 0) {
2980 ret = btrfs_orphan_add(trans, inode);
2984 nr = trans->blocks_used;
2985 __unlink_end_trans(trans, root);
2986 btrfs_btree_balance_dirty(root, nr);
2990 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
2991 struct btrfs_root *root,
2992 struct inode *dir, u64 objectid,
2993 const char *name, int name_len)
2995 struct btrfs_path *path;
2996 struct extent_buffer *leaf;
2997 struct btrfs_dir_item *di;
2998 struct btrfs_key key;
3002 path = btrfs_alloc_path();
3006 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
3007 name, name_len, -1);
3008 BUG_ON(!di || IS_ERR(di));
3010 leaf = path->nodes[0];
3011 btrfs_dir_item_key_to_cpu(leaf, di, &key);
3012 WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid);
3013 ret = btrfs_delete_one_dir_name(trans, root, path, di);
3015 btrfs_release_path(root, path);
3017 ret = btrfs_del_root_ref(trans, root->fs_info->tree_root,
3018 objectid, root->root_key.objectid,
3019 dir->i_ino, &index, name, name_len);
3021 BUG_ON(ret != -ENOENT);
3022 di = btrfs_search_dir_index_item(root, path, dir->i_ino,
3024 BUG_ON(!di || IS_ERR(di));
3026 leaf = path->nodes[0];
3027 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
3028 btrfs_release_path(root, path);
3032 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
3033 index, name, name_len, -1);
3034 BUG_ON(!di || IS_ERR(di));
3036 leaf = path->nodes[0];
3037 btrfs_dir_item_key_to_cpu(leaf, di, &key);
3038 WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid);
3039 ret = btrfs_delete_one_dir_name(trans, root, path, di);
3041 btrfs_release_path(root, path);
3043 btrfs_i_size_write(dir, dir->i_size - name_len * 2);
3044 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
3045 ret = btrfs_update_inode(trans, root, dir);
3048 btrfs_free_path(path);
3052 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
3054 struct inode *inode = dentry->d_inode;
3056 struct btrfs_root *root = BTRFS_I(dir)->root;
3057 struct btrfs_trans_handle *trans;
3058 unsigned long nr = 0;
3060 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE ||
3061 inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
3064 trans = __unlink_start_trans(dir, dentry);
3066 return PTR_ERR(trans);
3068 btrfs_set_trans_block_group(trans, dir);
3070 if (unlikely(inode->i_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) {
3071 err = btrfs_unlink_subvol(trans, root, dir,
3072 BTRFS_I(inode)->location.objectid,
3073 dentry->d_name.name,
3074 dentry->d_name.len);
3078 err = btrfs_orphan_add(trans, inode);
3082 /* now the directory is empty */
3083 err = btrfs_unlink_inode(trans, root, dir, dentry->d_inode,
3084 dentry->d_name.name, dentry->d_name.len);
3086 btrfs_i_size_write(inode, 0);
3088 nr = trans->blocks_used;
3089 __unlink_end_trans(trans, root);
3090 btrfs_btree_balance_dirty(root, nr);
3097 * when truncating bytes in a file, it is possible to avoid reading
3098 * the leaves that contain only checksum items. This can be the
3099 * majority of the IO required to delete a large file, but it must
3100 * be done carefully.
3102 * The keys in the level just above the leaves are checked to make sure
3103 * the lowest key in a given leaf is a csum key, and starts at an offset
3104 * after the new size.
3106 * Then the key for the next leaf is checked to make sure it also has
3107 * a checksum item for the same file. If it does, we know our target leaf
3108 * contains only checksum items, and it can be safely freed without reading
3111 * This is just an optimization targeted at large files. It may do
3112 * nothing. It will return 0 unless things went badly.
3114 static noinline int drop_csum_leaves(struct btrfs_trans_handle *trans,
3115 struct btrfs_root *root,
3116 struct btrfs_path *path,
3117 struct inode *inode, u64 new_size)
3119 struct btrfs_key key;
3122 struct btrfs_key found_key;
3123 struct btrfs_key other_key;
3124 struct btrfs_leaf_ref *ref;
3128 path->lowest_level = 1;
3129 key.objectid = inode->i_ino;
3130 key.type = BTRFS_CSUM_ITEM_KEY;
3131 key.offset = new_size;
3133 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
3137 if (path->nodes[1] == NULL) {
3142 btrfs_node_key_to_cpu(path->nodes[1], &found_key, path->slots[1]);
3143 nritems = btrfs_header_nritems(path->nodes[1]);
3148 if (path->slots[1] >= nritems)
3151 /* did we find a key greater than anything we want to delete? */
3152 if (found_key.objectid > inode->i_ino ||
3153 (found_key.objectid == inode->i_ino && found_key.type > key.type))
3156 /* we check the next key in the node to make sure the leave contains
3157 * only checksum items. This comparison doesn't work if our
3158 * leaf is the last one in the node
3160 if (path->slots[1] + 1 >= nritems) {
3162 /* search forward from the last key in the node, this
3163 * will bring us into the next node in the tree
3165 btrfs_node_key_to_cpu(path->nodes[1], &found_key, nritems - 1);
3167 /* unlikely, but we inc below, so check to be safe */
3168 if (found_key.offset == (u64)-1)
3171 /* search_forward needs a path with locks held, do the
3172 * search again for the original key. It is possible
3173 * this will race with a balance and return a path that
3174 * we could modify, but this drop is just an optimization
3175 * and is allowed to miss some leaves.
3177 btrfs_release_path(root, path);
3180 /* setup a max key for search_forward */
3181 other_key.offset = (u64)-1;
3182 other_key.type = key.type;
3183 other_key.objectid = key.objectid;
3185 path->keep_locks = 1;
3186 ret = btrfs_search_forward(root, &found_key, &other_key,
3188 path->keep_locks = 0;
3189 if (ret || found_key.objectid != key.objectid ||
3190 found_key.type != key.type) {
3195 key.offset = found_key.offset;
3196 btrfs_release_path(root, path);
3201 /* we know there's one more slot after us in the tree,
3202 * read that key so we can verify it is also a checksum item
3204 btrfs_node_key_to_cpu(path->nodes[1], &other_key, path->slots[1] + 1);
3206 if (found_key.objectid < inode->i_ino)
3209 if (found_key.type != key.type || found_key.offset < new_size)
3213 * if the key for the next leaf isn't a csum key from this objectid,
3214 * we can't be sure there aren't good items inside this leaf.
3217 if (other_key.objectid != inode->i_ino || other_key.type != key.type)
3220 leaf_start = btrfs_node_blockptr(path->nodes[1], path->slots[1]);
3221 leaf_gen = btrfs_node_ptr_generation(path->nodes[1], path->slots[1]);
3223 * it is safe to delete this leaf, it contains only
3224 * csum items from this inode at an offset >= new_size
3226 ret = btrfs_del_leaf(trans, root, path, leaf_start);
3229 if (root->ref_cows && leaf_gen < trans->transid) {
3230 ref = btrfs_alloc_leaf_ref(root, 0);
3232 ref->root_gen = root->root_key.offset;
3233 ref->bytenr = leaf_start;
3235 ref->generation = leaf_gen;
3238 btrfs_sort_leaf_ref(ref);
3240 ret = btrfs_add_leaf_ref(root, ref, 0);
3242 btrfs_free_leaf_ref(root, ref);
3248 btrfs_release_path(root, path);
3250 if (other_key.objectid == inode->i_ino &&
3251 other_key.type == key.type && other_key.offset > key.offset) {
3252 key.offset = other_key.offset;
3258 /* fixup any changes we've made to the path */
3259 path->lowest_level = 0;
3260 path->keep_locks = 0;
3261 btrfs_release_path(root, path);
3268 * this can truncate away extent items, csum items and directory items.
3269 * It starts at a high offset and removes keys until it can't find
3270 * any higher than new_size
3272 * csum items that cross the new i_size are truncated to the new size
3275 * min_type is the minimum key type to truncate down to. If set to 0, this
3276 * will kill all the items on this inode, including the INODE_ITEM_KEY.
3278 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3279 struct btrfs_root *root,
3280 struct inode *inode,
3281 u64 new_size, u32 min_type)
3283 struct btrfs_path *path;
3284 struct extent_buffer *leaf;
3285 struct btrfs_file_extent_item *fi;
3286 struct btrfs_key key;
3287 struct btrfs_key found_key;
3288 u64 extent_start = 0;
3289 u64 extent_num_bytes = 0;
3290 u64 extent_offset = 0;
3292 u64 mask = root->sectorsize - 1;
3293 u32 found_type = (u8)-1;
3296 int pending_del_nr = 0;
3297 int pending_del_slot = 0;
3298 int extent_type = -1;
3303 BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY);
3305 if (root->ref_cows || root == root->fs_info->tree_root)
3306 btrfs_drop_extent_cache(inode, new_size & (~mask), (u64)-1, 0);
3308 path = btrfs_alloc_path();
3312 key.objectid = inode->i_ino;
3313 key.offset = (u64)-1;
3317 path->leave_spinning = 1;
3318 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
3325 /* there are no items in the tree for us to truncate, we're
3328 if (path->slots[0] == 0)
3335 leaf = path->nodes[0];
3336 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
3337 found_type = btrfs_key_type(&found_key);
3340 if (found_key.objectid != inode->i_ino)
3343 if (found_type < min_type)
3346 item_end = found_key.offset;
3347 if (found_type == BTRFS_EXTENT_DATA_KEY) {
3348 fi = btrfs_item_ptr(leaf, path->slots[0],
3349 struct btrfs_file_extent_item);
3350 extent_type = btrfs_file_extent_type(leaf, fi);
3351 encoding = btrfs_file_extent_compression(leaf, fi);
3352 encoding |= btrfs_file_extent_encryption(leaf, fi);
3353 encoding |= btrfs_file_extent_other_encoding(leaf, fi);
3355 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
3357 btrfs_file_extent_num_bytes(leaf, fi);
3358 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
3359 item_end += btrfs_file_extent_inline_len(leaf,
3364 if (found_type > min_type) {
3367 if (item_end < new_size)
3369 if (found_key.offset >= new_size)
3375 /* FIXME, shrink the extent if the ref count is only 1 */
3376 if (found_type != BTRFS_EXTENT_DATA_KEY)
3379 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
3381 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
3382 if (!del_item && !encoding) {
3383 u64 orig_num_bytes =
3384 btrfs_file_extent_num_bytes(leaf, fi);
3385 extent_num_bytes = new_size -
3386 found_key.offset + root->sectorsize - 1;
3387 extent_num_bytes = extent_num_bytes &
3388 ~((u64)root->sectorsize - 1);
3389 btrfs_set_file_extent_num_bytes(leaf, fi,
3391 num_dec = (orig_num_bytes -
3393 if (root->ref_cows && extent_start != 0)
3394 inode_sub_bytes(inode, num_dec);
3395 btrfs_mark_buffer_dirty(leaf);
3398 btrfs_file_extent_disk_num_bytes(leaf,
3400 extent_offset = found_key.offset -
3401 btrfs_file_extent_offset(leaf, fi);
3403 /* FIXME blocksize != 4096 */
3404 num_dec = btrfs_file_extent_num_bytes(leaf, fi);
3405 if (extent_start != 0) {
3408 inode_sub_bytes(inode, num_dec);
3411 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
3413 * we can't truncate inline items that have had
3417 btrfs_file_extent_compression(leaf, fi) == 0 &&
3418 btrfs_file_extent_encryption(leaf, fi) == 0 &&
3419 btrfs_file_extent_other_encoding(leaf, fi) == 0) {
3420 u32 size = new_size - found_key.offset;
3422 if (root->ref_cows) {
3423 inode_sub_bytes(inode, item_end + 1 -
3427 btrfs_file_extent_calc_inline_size(size);
3428 ret = btrfs_truncate_item(trans, root, path,
3431 } else if (root->ref_cows) {
3432 inode_sub_bytes(inode, item_end + 1 -
3438 if (!pending_del_nr) {
3439 /* no pending yet, add ourselves */
3440 pending_del_slot = path->slots[0];
3442 } else if (pending_del_nr &&
3443 path->slots[0] + 1 == pending_del_slot) {
3444 /* hop on the pending chunk */
3446 pending_del_slot = path->slots[0];
3453 if (found_extent && (root->ref_cows ||
3454 root == root->fs_info->tree_root)) {
3455 btrfs_set_path_blocking(path);
3456 ret = btrfs_free_extent(trans, root, extent_start,
3457 extent_num_bytes, 0,
3458 btrfs_header_owner(leaf),
3459 inode->i_ino, extent_offset);
3463 if (found_type == BTRFS_INODE_ITEM_KEY)
3466 if (path->slots[0] == 0 ||
3467 path->slots[0] != pending_del_slot) {
3468 if (root->ref_cows) {
3472 if (pending_del_nr) {
3473 ret = btrfs_del_items(trans, root, path,
3479 btrfs_release_path(root, path);
3486 if (pending_del_nr) {
3487 ret = btrfs_del_items(trans, root, path, pending_del_slot,
3491 btrfs_free_path(path);
3496 * taken from block_truncate_page, but does cow as it zeros out
3497 * any bytes left in the last page in the file.
3499 static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
3501 struct inode *inode = mapping->host;
3502 struct btrfs_root *root = BTRFS_I(inode)->root;
3503 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
3504 struct btrfs_ordered_extent *ordered;
3505 struct extent_state *cached_state = NULL;
3507 u32 blocksize = root->sectorsize;
3508 pgoff_t index = from >> PAGE_CACHE_SHIFT;
3509 unsigned offset = from & (PAGE_CACHE_SIZE-1);
3515 if ((offset & (blocksize - 1)) == 0)
3517 ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE);
3523 page = grab_cache_page(mapping, index);
3525 btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE);
3529 page_start = page_offset(page);
3530 page_end = page_start + PAGE_CACHE_SIZE - 1;
3532 if (!PageUptodate(page)) {
3533 ret = btrfs_readpage(NULL, page);
3535 if (page->mapping != mapping) {
3537 page_cache_release(page);
3540 if (!PageUptodate(page)) {
3545 wait_on_page_writeback(page);
3547 lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state,
3549 set_page_extent_mapped(page);
3551 ordered = btrfs_lookup_ordered_extent(inode, page_start);
3553 unlock_extent_cached(io_tree, page_start, page_end,
3554 &cached_state, GFP_NOFS);
3556 page_cache_release(page);
3557 btrfs_start_ordered_extent(inode, ordered, 1);
3558 btrfs_put_ordered_extent(ordered);
3562 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end,
3563 EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING,
3564 0, 0, &cached_state, GFP_NOFS);
3566 ret = btrfs_set_extent_delalloc(inode, page_start, page_end,
3569 unlock_extent_cached(io_tree, page_start, page_end,
3570 &cached_state, GFP_NOFS);
3575 if (offset != PAGE_CACHE_SIZE) {
3577 memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
3578 flush_dcache_page(page);
3581 ClearPageChecked(page);
3582 set_page_dirty(page);
3583 unlock_extent_cached(io_tree, page_start, page_end, &cached_state,
3588 btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE);
3590 page_cache_release(page);
3596 * This function puts in dummy file extents for the area we're creating a hole
3597 * for. So if we are truncating this file to a larger size we need to insert
3598 * these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for
3599 * the range between oldsize and size
3601 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size)
3603 struct btrfs_trans_handle *trans;
3604 struct btrfs_root *root = BTRFS_I(inode)->root;
3605 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
3606 struct extent_map *em = NULL;
3607 struct extent_state *cached_state = NULL;
3608 u64 mask = root->sectorsize - 1;
3609 u64 hole_start = (oldsize + mask) & ~mask;
3610 u64 block_end = (size + mask) & ~mask;
3616 if (size <= hole_start)
3620 struct btrfs_ordered_extent *ordered;
3621 btrfs_wait_ordered_range(inode, hole_start,
3622 block_end - hole_start);
3623 lock_extent_bits(io_tree, hole_start, block_end - 1, 0,
3624 &cached_state, GFP_NOFS);
3625 ordered = btrfs_lookup_ordered_extent(inode, hole_start);
3628 unlock_extent_cached(io_tree, hole_start, block_end - 1,
3629 &cached_state, GFP_NOFS);
3630 btrfs_put_ordered_extent(ordered);
3633 cur_offset = hole_start;
3635 em = btrfs_get_extent(inode, NULL, 0, cur_offset,
3636 block_end - cur_offset, 0);
3637 BUG_ON(IS_ERR(em) || !em);
3638 last_byte = min(extent_map_end(em), block_end);
3639 last_byte = (last_byte + mask) & ~mask;
3640 if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) {
3642 hole_size = last_byte - cur_offset;
3644 trans = btrfs_start_transaction(root, 2);
3645 if (IS_ERR(trans)) {
3646 err = PTR_ERR(trans);
3649 btrfs_set_trans_block_group(trans, inode);
3651 err = btrfs_drop_extents(trans, inode, cur_offset,
3652 cur_offset + hole_size,
3657 err = btrfs_insert_file_extent(trans, root,
3658 inode->i_ino, cur_offset, 0,
3659 0, hole_size, 0, hole_size,
3664 btrfs_drop_extent_cache(inode, hole_start,
3667 btrfs_end_transaction(trans, root);
3669 free_extent_map(em);
3671 cur_offset = last_byte;
3672 if (cur_offset >= block_end)
3676 free_extent_map(em);
3677 unlock_extent_cached(io_tree, hole_start, block_end - 1, &cached_state,
3682 static int btrfs_setsize(struct inode *inode, loff_t newsize)
3684 loff_t oldsize = i_size_read(inode);
3687 if (newsize == oldsize)
3690 if (newsize > oldsize) {
3691 i_size_write(inode, newsize);
3692 btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL);
3693 truncate_pagecache(inode, oldsize, newsize);
3694 ret = btrfs_cont_expand(inode, oldsize, newsize);
3696 btrfs_setsize(inode, oldsize);
3700 mark_inode_dirty(inode);
3704 * We're truncating a file that used to have good data down to
3705 * zero. Make sure it gets into the ordered flush list so that
3706 * any new writes get down to disk quickly.
3709 BTRFS_I(inode)->ordered_data_close = 1;
3711 /* we don't support swapfiles, so vmtruncate shouldn't fail */
3712 truncate_setsize(inode, newsize);
3713 ret = btrfs_truncate(inode);
3719 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
3721 struct inode *inode = dentry->d_inode;
3722 struct btrfs_root *root = BTRFS_I(inode)->root;
3725 if (btrfs_root_readonly(root))
3728 err = inode_change_ok(inode, attr);
3732 if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) {
3733 err = btrfs_setsize(inode, attr->ia_size);
3738 if (attr->ia_valid) {
3739 setattr_copy(inode, attr);
3740 mark_inode_dirty(inode);
3742 if (attr->ia_valid & ATTR_MODE)
3743 err = btrfs_acl_chmod(inode);
3749 void btrfs_evict_inode(struct inode *inode)
3751 struct btrfs_trans_handle *trans;
3752 struct btrfs_root *root = BTRFS_I(inode)->root;
3756 trace_btrfs_inode_evict(inode);
3758 truncate_inode_pages(&inode->i_data, 0);
3759 if (inode->i_nlink && (btrfs_root_refs(&root->root_item) != 0 ||
3760 root == root->fs_info->tree_root))
3763 if (is_bad_inode(inode)) {
3764 btrfs_orphan_del(NULL, inode);
3767 /* do we really want it for ->i_nlink > 0 and zero btrfs_root_refs? */
3768 btrfs_wait_ordered_range(inode, 0, (u64)-1);
3770 if (root->fs_info->log_root_recovering) {
3771 BUG_ON(!list_empty(&BTRFS_I(inode)->i_orphan));
3775 if (inode->i_nlink > 0) {
3776 BUG_ON(btrfs_root_refs(&root->root_item) != 0);
3780 btrfs_i_size_write(inode, 0);
3783 trans = btrfs_start_transaction(root, 0);
3784 BUG_ON(IS_ERR(trans));
3785 btrfs_set_trans_block_group(trans, inode);
3786 trans->block_rsv = root->orphan_block_rsv;
3788 ret = btrfs_block_rsv_check(trans, root,
3789 root->orphan_block_rsv, 0, 5);
3791 BUG_ON(ret != -EAGAIN);
3792 ret = btrfs_commit_transaction(trans, root);
3797 ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0);
3801 nr = trans->blocks_used;
3802 btrfs_end_transaction(trans, root);
3804 btrfs_btree_balance_dirty(root, nr);
3809 ret = btrfs_orphan_del(trans, inode);
3813 nr = trans->blocks_used;
3814 btrfs_end_transaction(trans, root);
3815 btrfs_btree_balance_dirty(root, nr);
3817 end_writeback(inode);
3822 * this returns the key found in the dir entry in the location pointer.
3823 * If no dir entries were found, location->objectid is 0.
3825 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
3826 struct btrfs_key *location)
3828 const char *name = dentry->d_name.name;
3829 int namelen = dentry->d_name.len;
3830 struct btrfs_dir_item *di;
3831 struct btrfs_path *path;
3832 struct btrfs_root *root = BTRFS_I(dir)->root;
3835 path = btrfs_alloc_path();
3838 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
3843 if (!di || IS_ERR(di))
3846 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
3848 btrfs_free_path(path);
3851 location->objectid = 0;
3856 * when we hit a tree root in a directory, the btrfs part of the inode
3857 * needs to be changed to reflect the root directory of the tree root. This
3858 * is kind of like crossing a mount point.
3860 static int fixup_tree_root_location(struct btrfs_root *root,
3862 struct dentry *dentry,
3863 struct btrfs_key *location,
3864 struct btrfs_root **sub_root)
3866 struct btrfs_path *path;
3867 struct btrfs_root *new_root;
3868 struct btrfs_root_ref *ref;
3869 struct extent_buffer *leaf;
3873 path = btrfs_alloc_path();
3880 ret = btrfs_find_root_ref(root->fs_info->tree_root, path,
3881 BTRFS_I(dir)->root->root_key.objectid,
3882 location->objectid);
3889 leaf = path->nodes[0];
3890 ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref);
3891 if (btrfs_root_ref_dirid(leaf, ref) != dir->i_ino ||
3892 btrfs_root_ref_name_len(leaf, ref) != dentry->d_name.len)
3895 ret = memcmp_extent_buffer(leaf, dentry->d_name.name,
3896 (unsigned long)(ref + 1),
3897 dentry->d_name.len);
3901 btrfs_release_path(root->fs_info->tree_root, path);
3903 new_root = btrfs_read_fs_root_no_name(root->fs_info, location);
3904 if (IS_ERR(new_root)) {
3905 err = PTR_ERR(new_root);
3909 if (btrfs_root_refs(&new_root->root_item) == 0) {
3914 *sub_root = new_root;
3915 location->objectid = btrfs_root_dirid(&new_root->root_item);
3916 location->type = BTRFS_INODE_ITEM_KEY;
3917 location->offset = 0;
3920 btrfs_free_path(path);
3924 static void inode_tree_add(struct inode *inode)
3926 struct btrfs_root *root = BTRFS_I(inode)->root;
3927 struct btrfs_inode *entry;
3929 struct rb_node *parent;
3931 p = &root->inode_tree.rb_node;
3934 if (inode_unhashed(inode))
3937 spin_lock(&root->inode_lock);
3940 entry = rb_entry(parent, struct btrfs_inode, rb_node);
3942 if (inode->i_ino < entry->vfs_inode.i_ino)
3943 p = &parent->rb_left;
3944 else if (inode->i_ino > entry->vfs_inode.i_ino)
3945 p = &parent->rb_right;
3947 WARN_ON(!(entry->vfs_inode.i_state &
3948 (I_WILL_FREE | I_FREEING)));
3949 rb_erase(parent, &root->inode_tree);
3950 RB_CLEAR_NODE(parent);
3951 spin_unlock(&root->inode_lock);
3955 rb_link_node(&BTRFS_I(inode)->rb_node, parent, p);
3956 rb_insert_color(&BTRFS_I(inode)->rb_node, &root->inode_tree);
3957 spin_unlock(&root->inode_lock);
3960 static void inode_tree_del(struct inode *inode)
3962 struct btrfs_root *root = BTRFS_I(inode)->root;
3965 spin_lock(&root->inode_lock);
3966 if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) {
3967 rb_erase(&BTRFS_I(inode)->rb_node, &root->inode_tree);
3968 RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
3969 empty = RB_EMPTY_ROOT(&root->inode_tree);
3971 spin_unlock(&root->inode_lock);
3974 * Free space cache has inodes in the tree root, but the tree root has a
3975 * root_refs of 0, so this could end up dropping the tree root as a
3976 * snapshot, so we need the extra !root->fs_info->tree_root check to
3977 * make sure we don't drop it.
3979 if (empty && btrfs_root_refs(&root->root_item) == 0 &&
3980 root != root->fs_info->tree_root) {
3981 synchronize_srcu(&root->fs_info->subvol_srcu);
3982 spin_lock(&root->inode_lock);
3983 empty = RB_EMPTY_ROOT(&root->inode_tree);
3984 spin_unlock(&root->inode_lock);
3986 btrfs_add_dead_root(root);
3990 int btrfs_invalidate_inodes(struct btrfs_root *root)
3992 struct rb_node *node;
3993 struct rb_node *prev;
3994 struct btrfs_inode *entry;
3995 struct inode *inode;
3998 WARN_ON(btrfs_root_refs(&root->root_item) != 0);
4000 spin_lock(&root->inode_lock);
4002 node = root->inode_tree.rb_node;
4006 entry = rb_entry(node, struct btrfs_inode, rb_node);
4008 if (objectid < entry->vfs_inode.i_ino)
4009 node = node->rb_left;
4010 else if (objectid > entry->vfs_inode.i_ino)
4011 node = node->rb_right;
4017 entry = rb_entry(prev, struct btrfs_inode, rb_node);
4018 if (objectid <= entry->vfs_inode.i_ino) {
4022 prev = rb_next(prev);
4026 entry = rb_entry(node, struct btrfs_inode, rb_node);
4027 objectid = entry->vfs_inode.i_ino + 1;
4028 inode = igrab(&entry->vfs_inode);
4030 spin_unlock(&root->inode_lock);
4031 if (atomic_read(&inode->i_count) > 1)
4032 d_prune_aliases(inode);
4034 * btrfs_drop_inode will have it removed from
4035 * the inode cache when its usage count
4040 spin_lock(&root->inode_lock);
4044 if (cond_resched_lock(&root->inode_lock))
4047 node = rb_next(node);
4049 spin_unlock(&root->inode_lock);
4053 static int btrfs_init_locked_inode(struct inode *inode, void *p)
4055 struct btrfs_iget_args *args = p;
4056 inode->i_ino = args->ino;
4057 BTRFS_I(inode)->root = args->root;
4058 btrfs_set_inode_space_info(args->root, inode);
4062 static int btrfs_find_actor(struct inode *inode, void *opaque)
4064 struct btrfs_iget_args *args = opaque;
4065 return args->ino == inode->i_ino &&
4066 args->root == BTRFS_I(inode)->root;
4069 static struct inode *btrfs_iget_locked(struct super_block *s,
4071 struct btrfs_root *root)
4073 struct inode *inode;
4074 struct btrfs_iget_args args;
4075 args.ino = objectid;
4078 inode = iget5_locked(s, objectid, btrfs_find_actor,
4079 btrfs_init_locked_inode,
4084 /* Get an inode object given its location and corresponding root.
4085 * Returns in *is_new if the inode was read from disk
4087 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
4088 struct btrfs_root *root, int *new)
4090 struct inode *inode;
4092 inode = btrfs_iget_locked(s, location->objectid, root);
4094 return ERR_PTR(-ENOMEM);
4096 if (inode->i_state & I_NEW) {
4097 BTRFS_I(inode)->root = root;
4098 memcpy(&BTRFS_I(inode)->location, location, sizeof(*location));
4099 btrfs_read_locked_inode(inode);
4100 inode_tree_add(inode);
4101 unlock_new_inode(inode);
4109 static struct inode *new_simple_dir(struct super_block *s,
4110 struct btrfs_key *key,
4111 struct btrfs_root *root)
4113 struct inode *inode = new_inode(s);
4116 return ERR_PTR(-ENOMEM);
4118 BTRFS_I(inode)->root = root;
4119 memcpy(&BTRFS_I(inode)->location, key, sizeof(*key));
4120 BTRFS_I(inode)->dummy_inode = 1;
4122 inode->i_ino = BTRFS_EMPTY_SUBVOL_DIR_OBJECTID;
4123 inode->i_op = &simple_dir_inode_operations;
4124 inode->i_fop = &simple_dir_operations;
4125 inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO;
4126 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
4131 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
4133 struct inode *inode;
4134 struct btrfs_root *root = BTRFS_I(dir)->root;
4135 struct btrfs_root *sub_root = root;
4136 struct btrfs_key location;
4140 if (dentry->d_name.len > BTRFS_NAME_LEN)
4141 return ERR_PTR(-ENAMETOOLONG);
4143 ret = btrfs_inode_by_name(dir, dentry, &location);
4146 return ERR_PTR(ret);
4148 if (location.objectid == 0)
4151 if (location.type == BTRFS_INODE_ITEM_KEY) {
4152 inode = btrfs_iget(dir->i_sb, &location, root, NULL);
4156 BUG_ON(location.type != BTRFS_ROOT_ITEM_KEY);
4158 index = srcu_read_lock(&root->fs_info->subvol_srcu);
4159 ret = fixup_tree_root_location(root, dir, dentry,
4160 &location, &sub_root);
4163 inode = ERR_PTR(ret);
4165 inode = new_simple_dir(dir->i_sb, &location, sub_root);
4167 inode = btrfs_iget(dir->i_sb, &location, sub_root, NULL);
4169 srcu_read_unlock(&root->fs_info->subvol_srcu, index);
4171 if (!IS_ERR(inode) && root != sub_root) {
4172 down_read(&root->fs_info->cleanup_work_sem);
4173 if (!(inode->i_sb->s_flags & MS_RDONLY))
4174 ret = btrfs_orphan_cleanup(sub_root);
4175 up_read(&root->fs_info->cleanup_work_sem);
4177 inode = ERR_PTR(ret);
4183 static int btrfs_dentry_delete(const struct dentry *dentry)
4185 struct btrfs_root *root;
4187 if (!dentry->d_inode && !IS_ROOT(dentry))
4188 dentry = dentry->d_parent;
4190 if (dentry->d_inode) {
4191 root = BTRFS_I(dentry->d_inode)->root;
4192 if (btrfs_root_refs(&root->root_item) == 0)
4198 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
4199 struct nameidata *nd)
4201 struct inode *inode;
4203 inode = btrfs_lookup_dentry(dir, dentry);
4205 return ERR_CAST(inode);
4207 return d_splice_alias(inode, dentry);
4210 static unsigned char btrfs_filetype_table[] = {
4211 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
4214 static int btrfs_real_readdir(struct file *filp, void *dirent,
4217 struct inode *inode = filp->f_dentry->d_inode;
4218 struct btrfs_root *root = BTRFS_I(inode)->root;
4219 struct btrfs_item *item;
4220 struct btrfs_dir_item *di;
4221 struct btrfs_key key;
4222 struct btrfs_key found_key;
4223 struct btrfs_path *path;
4225 struct extent_buffer *leaf;
4227 unsigned char d_type;
4232 int key_type = BTRFS_DIR_INDEX_KEY;
4237 /* FIXME, use a real flag for deciding about the key type */
4238 if (root->fs_info->tree_root == root)
4239 key_type = BTRFS_DIR_ITEM_KEY;
4241 /* special case for "." */
4242 if (filp->f_pos == 0) {
4243 over = filldir(dirent, ".", 1,
4250 /* special case for .., just use the back ref */
4251 if (filp->f_pos == 1) {
4252 u64 pino = parent_ino(filp->f_path.dentry);
4253 over = filldir(dirent, "..", 2,
4259 path = btrfs_alloc_path();
4262 btrfs_set_key_type(&key, key_type);
4263 key.offset = filp->f_pos;
4264 key.objectid = inode->i_ino;
4266 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
4271 leaf = path->nodes[0];
4272 slot = path->slots[0];
4273 if (slot >= btrfs_header_nritems(leaf)) {
4274 ret = btrfs_next_leaf(root, path);
4282 item = btrfs_item_nr(leaf, slot);
4283 btrfs_item_key_to_cpu(leaf, &found_key, slot);
4285 if (found_key.objectid != key.objectid)
4287 if (btrfs_key_type(&found_key) != key_type)
4289 if (found_key.offset < filp->f_pos)
4292 filp->f_pos = found_key.offset;
4294 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
4296 di_total = btrfs_item_size(leaf, item);
4298 while (di_cur < di_total) {
4299 struct btrfs_key location;
4301 if (verify_dir_item(root, leaf, di))
4304 name_len = btrfs_dir_name_len(leaf, di);
4305 if (name_len <= sizeof(tmp_name)) {
4306 name_ptr = tmp_name;
4308 name_ptr = kmalloc(name_len, GFP_NOFS);
4314 read_extent_buffer(leaf, name_ptr,
4315 (unsigned long)(di + 1), name_len);
4317 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
4318 btrfs_dir_item_key_to_cpu(leaf, di, &location);
4320 /* is this a reference to our own snapshot? If so
4323 if (location.type == BTRFS_ROOT_ITEM_KEY &&
4324 location.objectid == root->root_key.objectid) {
4328 over = filldir(dirent, name_ptr, name_len,
4329 found_key.offset, location.objectid,
4333 if (name_ptr != tmp_name)
4338 di_len = btrfs_dir_name_len(leaf, di) +
4339 btrfs_dir_data_len(leaf, di) + sizeof(*di);
4341 di = (struct btrfs_dir_item *)((char *)di + di_len);
4347 /* Reached end of directory/root. Bump pos past the last item. */
4348 if (key_type == BTRFS_DIR_INDEX_KEY)
4350 * 32-bit glibc will use getdents64, but then strtol -
4351 * so the last number we can serve is this.
4353 filp->f_pos = 0x7fffffff;
4359 btrfs_free_path(path);
4363 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc)
4365 struct btrfs_root *root = BTRFS_I(inode)->root;
4366 struct btrfs_trans_handle *trans;
4368 bool nolock = false;
4370 if (BTRFS_I(inode)->dummy_inode)
4374 nolock = (root->fs_info->closing && root == root->fs_info->tree_root);
4376 if (wbc->sync_mode == WB_SYNC_ALL) {
4378 trans = btrfs_join_transaction_nolock(root, 1);
4380 trans = btrfs_join_transaction(root, 1);
4382 return PTR_ERR(trans);
4383 btrfs_set_trans_block_group(trans, inode);
4385 ret = btrfs_end_transaction_nolock(trans, root);
4387 ret = btrfs_commit_transaction(trans, root);
4393 * This is somewhat expensive, updating the tree every time the
4394 * inode changes. But, it is most likely to find the inode in cache.
4395 * FIXME, needs more benchmarking...there are no reasons other than performance
4396 * to keep or drop this code.
4398 void btrfs_dirty_inode(struct inode *inode)
4400 struct btrfs_root *root = BTRFS_I(inode)->root;
4401 struct btrfs_trans_handle *trans;
4404 if (BTRFS_I(inode)->dummy_inode)
4407 trans = btrfs_join_transaction(root, 1);
4408 BUG_ON(IS_ERR(trans));
4409 btrfs_set_trans_block_group(trans, inode);
4411 ret = btrfs_update_inode(trans, root, inode);
4412 if (ret && ret == -ENOSPC) {
4413 /* whoops, lets try again with the full transaction */
4414 btrfs_end_transaction(trans, root);
4415 trans = btrfs_start_transaction(root, 1);
4416 if (IS_ERR(trans)) {
4417 if (printk_ratelimit()) {
4418 printk(KERN_ERR "btrfs: fail to "
4419 "dirty inode %lu error %ld\n",
4420 inode->i_ino, PTR_ERR(trans));
4424 btrfs_set_trans_block_group(trans, inode);
4426 ret = btrfs_update_inode(trans, root, inode);
4428 if (printk_ratelimit()) {
4429 printk(KERN_ERR "btrfs: fail to "
4430 "dirty inode %lu error %d\n",
4435 btrfs_end_transaction(trans, root);
4439 * find the highest existing sequence number in a directory
4440 * and then set the in-memory index_cnt variable to reflect
4441 * free sequence numbers
4443 static int btrfs_set_inode_index_count(struct inode *inode)
4445 struct btrfs_root *root = BTRFS_I(inode)->root;
4446 struct btrfs_key key, found_key;
4447 struct btrfs_path *path;
4448 struct extent_buffer *leaf;
4451 key.objectid = inode->i_ino;
4452 btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
4453 key.offset = (u64)-1;
4455 path = btrfs_alloc_path();
4459 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
4462 /* FIXME: we should be able to handle this */
4468 * MAGIC NUMBER EXPLANATION:
4469 * since we search a directory based on f_pos we have to start at 2
4470 * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody
4471 * else has to start at 2
4473 if (path->slots[0] == 0) {
4474 BTRFS_I(inode)->index_cnt = 2;
4480 leaf = path->nodes[0];
4481 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
4483 if (found_key.objectid != inode->i_ino ||
4484 btrfs_key_type(&found_key) != BTRFS_DIR_INDEX_KEY) {
4485 BTRFS_I(inode)->index_cnt = 2;
4489 BTRFS_I(inode)->index_cnt = found_key.offset + 1;
4491 btrfs_free_path(path);
4496 * helper to find a free sequence number in a given directory. This current
4497 * code is very simple, later versions will do smarter things in the btree
4499 int btrfs_set_inode_index(struct inode *dir, u64 *index)
4503 if (BTRFS_I(dir)->index_cnt == (u64)-1) {
4504 ret = btrfs_set_inode_index_count(dir);
4509 *index = BTRFS_I(dir)->index_cnt;
4510 BTRFS_I(dir)->index_cnt++;
4515 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
4516 struct btrfs_root *root,
4518 const char *name, int name_len,
4519 u64 ref_objectid, u64 objectid,
4520 u64 alloc_hint, int mode, u64 *index)
4522 struct inode *inode;
4523 struct btrfs_inode_item *inode_item;
4524 struct btrfs_key *location;
4525 struct btrfs_path *path;
4526 struct btrfs_inode_ref *ref;
4527 struct btrfs_key key[2];
4533 path = btrfs_alloc_path();
4536 inode = new_inode(root->fs_info->sb);
4538 btrfs_free_path(path);
4539 return ERR_PTR(-ENOMEM);
4543 trace_btrfs_inode_request(dir);
4545 ret = btrfs_set_inode_index(dir, index);
4547 btrfs_free_path(path);
4549 return ERR_PTR(ret);
4553 * index_cnt is ignored for everything but a dir,
4554 * btrfs_get_inode_index_count has an explanation for the magic
4557 BTRFS_I(inode)->index_cnt = 2;
4558 BTRFS_I(inode)->root = root;
4559 BTRFS_I(inode)->generation = trans->transid;
4560 inode->i_generation = BTRFS_I(inode)->generation;
4561 btrfs_set_inode_space_info(root, inode);
4567 BTRFS_I(inode)->block_group =
4568 btrfs_find_block_group(root, 0, alloc_hint, owner);
4570 key[0].objectid = objectid;
4571 btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
4574 key[1].objectid = objectid;
4575 btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY);
4576 key[1].offset = ref_objectid;
4578 sizes[0] = sizeof(struct btrfs_inode_item);
4579 sizes[1] = name_len + sizeof(*ref);
4581 path->leave_spinning = 1;
4582 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
4586 inode_init_owner(inode, dir, mode);
4587 inode->i_ino = objectid;
4588 inode_set_bytes(inode, 0);
4589 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
4590 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
4591 struct btrfs_inode_item);
4592 fill_inode_item(trans, path->nodes[0], inode_item, inode);
4594 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
4595 struct btrfs_inode_ref);
4596 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
4597 btrfs_set_inode_ref_index(path->nodes[0], ref, *index);
4598 ptr = (unsigned long)(ref + 1);
4599 write_extent_buffer(path->nodes[0], name, ptr, name_len);
4601 btrfs_mark_buffer_dirty(path->nodes[0]);
4602 btrfs_free_path(path);
4604 location = &BTRFS_I(inode)->location;
4605 location->objectid = objectid;
4606 location->offset = 0;
4607 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
4609 btrfs_inherit_iflags(inode, dir);
4611 if ((mode & S_IFREG)) {
4612 if (btrfs_test_opt(root, NODATASUM))
4613 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
4614 if (btrfs_test_opt(root, NODATACOW) ||
4615 (BTRFS_I(dir)->flags & BTRFS_INODE_NODATACOW))
4616 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
4619 insert_inode_hash(inode);
4620 inode_tree_add(inode);
4622 trace_btrfs_inode_new(inode);
4627 BTRFS_I(dir)->index_cnt--;
4628 btrfs_free_path(path);
4630 return ERR_PTR(ret);
4633 static inline u8 btrfs_inode_type(struct inode *inode)
4635 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
4639 * utility function to add 'inode' into 'parent_inode' with
4640 * a give name and a given sequence number.
4641 * if 'add_backref' is true, also insert a backref from the
4642 * inode to the parent directory.
4644 int btrfs_add_link(struct btrfs_trans_handle *trans,
4645 struct inode *parent_inode, struct inode *inode,
4646 const char *name, int name_len, int add_backref, u64 index)
4649 struct btrfs_key key;
4650 struct btrfs_root *root = BTRFS_I(parent_inode)->root;
4652 if (unlikely(inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)) {
4653 memcpy(&key, &BTRFS_I(inode)->root->root_key, sizeof(key));
4655 key.objectid = inode->i_ino;
4656 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
4660 if (unlikely(inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)) {
4661 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
4662 key.objectid, root->root_key.objectid,
4663 parent_inode->i_ino,
4664 index, name, name_len);
4665 } else if (add_backref) {
4666 ret = btrfs_insert_inode_ref(trans, root,
4667 name, name_len, inode->i_ino,
4668 parent_inode->i_ino, index);
4672 ret = btrfs_insert_dir_item(trans, root, name, name_len,
4673 parent_inode->i_ino, &key,
4674 btrfs_inode_type(inode), index);
4677 btrfs_i_size_write(parent_inode, parent_inode->i_size +
4679 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
4680 ret = btrfs_update_inode(trans, root, parent_inode);
4685 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
4686 struct inode *dir, struct dentry *dentry,
4687 struct inode *inode, int backref, u64 index)
4689 int err = btrfs_add_link(trans, dir, inode,
4690 dentry->d_name.name, dentry->d_name.len,
4693 d_instantiate(dentry, inode);
4701 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
4702 int mode, dev_t rdev)
4704 struct btrfs_trans_handle *trans;
4705 struct btrfs_root *root = BTRFS_I(dir)->root;
4706 struct inode *inode = NULL;
4710 unsigned long nr = 0;
4713 if (!new_valid_dev(rdev))
4716 err = btrfs_find_free_objectid(NULL, root, dir->i_ino, &objectid);
4721 * 2 for inode item and ref
4723 * 1 for xattr if selinux is on
4725 trans = btrfs_start_transaction(root, 5);
4727 return PTR_ERR(trans);
4729 btrfs_set_trans_block_group(trans, dir);
4731 inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
4732 dentry->d_name.len, dir->i_ino, objectid,
4733 BTRFS_I(dir)->block_group, mode, &index);
4734 if (IS_ERR(inode)) {
4735 err = PTR_ERR(inode);
4739 err = btrfs_init_inode_security(trans, inode, dir);
4745 btrfs_set_trans_block_group(trans, inode);
4746 err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
4750 inode->i_op = &btrfs_special_inode_operations;
4751 init_special_inode(inode, inode->i_mode, rdev);
4752 btrfs_update_inode(trans, root, inode);
4754 btrfs_update_inode_block_group(trans, inode);
4755 btrfs_update_inode_block_group(trans, dir);
4757 nr = trans->blocks_used;
4758 btrfs_end_transaction_throttle(trans, root);
4759 btrfs_btree_balance_dirty(root, nr);
4761 inode_dec_link_count(inode);
4767 static int btrfs_create(struct inode *dir, struct dentry *dentry,
4768 int mode, struct nameidata *nd)
4770 struct btrfs_trans_handle *trans;
4771 struct btrfs_root *root = BTRFS_I(dir)->root;
4772 struct inode *inode = NULL;
4775 unsigned long nr = 0;
4779 err = btrfs_find_free_objectid(NULL, root, dir->i_ino, &objectid);
4783 * 2 for inode item and ref
4785 * 1 for xattr if selinux is on
4787 trans = btrfs_start_transaction(root, 5);
4789 return PTR_ERR(trans);
4791 btrfs_set_trans_block_group(trans, dir);
4793 inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
4794 dentry->d_name.len, dir->i_ino, objectid,
4795 BTRFS_I(dir)->block_group, mode, &index);
4796 if (IS_ERR(inode)) {
4797 err = PTR_ERR(inode);
4801 err = btrfs_init_inode_security(trans, inode, dir);
4807 btrfs_set_trans_block_group(trans, inode);
4808 err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
4812 inode->i_mapping->a_ops = &btrfs_aops;
4813 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
4814 inode->i_fop = &btrfs_file_operations;
4815 inode->i_op = &btrfs_file_inode_operations;
4816 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
4818 btrfs_update_inode_block_group(trans, inode);
4819 btrfs_update_inode_block_group(trans, dir);
4821 nr = trans->blocks_used;
4822 btrfs_end_transaction_throttle(trans, root);
4824 inode_dec_link_count(inode);
4827 btrfs_btree_balance_dirty(root, nr);
4831 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
4832 struct dentry *dentry)
4834 struct btrfs_trans_handle *trans;
4835 struct btrfs_root *root = BTRFS_I(dir)->root;
4836 struct inode *inode = old_dentry->d_inode;
4838 unsigned long nr = 0;
4842 if (inode->i_nlink == 0)
4845 /* do not allow sys_link's with other subvols of the same device */
4846 if (root->objectid != BTRFS_I(inode)->root->objectid)
4849 if (inode->i_nlink == ~0U)
4852 err = btrfs_set_inode_index(dir, &index);
4857 * 2 items for inode and inode ref
4858 * 2 items for dir items
4859 * 1 item for parent inode
4861 trans = btrfs_start_transaction(root, 5);
4862 if (IS_ERR(trans)) {
4863 err = PTR_ERR(trans);
4867 btrfs_inc_nlink(inode);
4868 inode->i_ctime = CURRENT_TIME;
4870 btrfs_set_trans_block_group(trans, dir);
4873 err = btrfs_add_nondir(trans, dir, dentry, inode, 1, index);
4878 struct dentry *parent = dget_parent(dentry);
4879 btrfs_update_inode_block_group(trans, dir);
4880 err = btrfs_update_inode(trans, root, inode);
4882 btrfs_log_new_name(trans, inode, NULL, parent);
4886 nr = trans->blocks_used;
4887 btrfs_end_transaction_throttle(trans, root);
4890 inode_dec_link_count(inode);
4893 btrfs_btree_balance_dirty(root, nr);
4897 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
4899 struct inode *inode = NULL;
4900 struct btrfs_trans_handle *trans;
4901 struct btrfs_root *root = BTRFS_I(dir)->root;
4903 int drop_on_err = 0;
4906 unsigned long nr = 1;
4908 err = btrfs_find_free_objectid(NULL, root, dir->i_ino, &objectid);
4913 * 2 items for inode and ref
4914 * 2 items for dir items
4915 * 1 for xattr if selinux is on
4917 trans = btrfs_start_transaction(root, 5);
4919 return PTR_ERR(trans);
4920 btrfs_set_trans_block_group(trans, dir);
4922 inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
4923 dentry->d_name.len, dir->i_ino, objectid,
4924 BTRFS_I(dir)->block_group, S_IFDIR | mode,
4926 if (IS_ERR(inode)) {
4927 err = PTR_ERR(inode);
4933 err = btrfs_init_inode_security(trans, inode, dir);
4937 inode->i_op = &btrfs_dir_inode_operations;
4938 inode->i_fop = &btrfs_dir_file_operations;
4939 btrfs_set_trans_block_group(trans, inode);
4941 btrfs_i_size_write(inode, 0);
4942 err = btrfs_update_inode(trans, root, inode);
4946 err = btrfs_add_link(trans, dir, inode, dentry->d_name.name,
4947 dentry->d_name.len, 0, index);
4951 d_instantiate(dentry, inode);
4953 btrfs_update_inode_block_group(trans, inode);
4954 btrfs_update_inode_block_group(trans, dir);
4957 nr = trans->blocks_used;
4958 btrfs_end_transaction_throttle(trans, root);
4961 btrfs_btree_balance_dirty(root, nr);
4965 /* helper for btfs_get_extent. Given an existing extent in the tree,
4966 * and an extent that you want to insert, deal with overlap and insert
4967 * the new extent into the tree.
4969 static int merge_extent_mapping(struct extent_map_tree *em_tree,
4970 struct extent_map *existing,
4971 struct extent_map *em,
4972 u64 map_start, u64 map_len)
4976 BUG_ON(map_start < em->start || map_start >= extent_map_end(em));
4977 start_diff = map_start - em->start;
4978 em->start = map_start;
4980 if (em->block_start < EXTENT_MAP_LAST_BYTE &&
4981 !test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) {
4982 em->block_start += start_diff;
4983 em->block_len -= start_diff;
4985 return add_extent_mapping(em_tree, em);
4988 static noinline int uncompress_inline(struct btrfs_path *path,
4989 struct inode *inode, struct page *page,
4990 size_t pg_offset, u64 extent_offset,
4991 struct btrfs_file_extent_item *item)
4994 struct extent_buffer *leaf = path->nodes[0];
4997 unsigned long inline_size;
5001 WARN_ON(pg_offset != 0);
5002 compress_type = btrfs_file_extent_compression(leaf, item);
5003 max_size = btrfs_file_extent_ram_bytes(leaf, item);
5004 inline_size = btrfs_file_extent_inline_item_len(leaf,
5005 btrfs_item_nr(leaf, path->slots[0]));
5006 tmp = kmalloc(inline_size, GFP_NOFS);
5009 ptr = btrfs_file_extent_inline_start(item);
5011 read_extent_buffer(leaf, tmp, ptr, inline_size);
5013 max_size = min_t(unsigned long, PAGE_CACHE_SIZE, max_size);
5014 ret = btrfs_decompress(compress_type, tmp, page,
5015 extent_offset, inline_size, max_size);
5017 char *kaddr = kmap_atomic(page, KM_USER0);
5018 unsigned long copy_size = min_t(u64,
5019 PAGE_CACHE_SIZE - pg_offset,
5020 max_size - extent_offset);
5021 memset(kaddr + pg_offset, 0, copy_size);
5022 kunmap_atomic(kaddr, KM_USER0);
5029 * a bit scary, this does extent mapping from logical file offset to the disk.
5030 * the ugly parts come from merging extents from the disk with the in-ram
5031 * representation. This gets more complex because of the data=ordered code,
5032 * where the in-ram extents might be locked pending data=ordered completion.
5034 * This also copies inline extents directly into the page.
5037 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
5038 size_t pg_offset, u64 start, u64 len,
5044 u64 extent_start = 0;
5046 u64 objectid = inode->i_ino;
5048 struct btrfs_path *path = NULL;
5049 struct btrfs_root *root = BTRFS_I(inode)->root;
5050 struct btrfs_file_extent_item *item;
5051 struct extent_buffer *leaf;
5052 struct btrfs_key found_key;
5053 struct extent_map *em = NULL;
5054 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
5055 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
5056 struct btrfs_trans_handle *trans = NULL;
5060 read_lock(&em_tree->lock);
5061 em = lookup_extent_mapping(em_tree, start, len);
5063 em->bdev = root->fs_info->fs_devices->latest_bdev;
5064 read_unlock(&em_tree->lock);
5067 if (em->start > start || em->start + em->len <= start)
5068 free_extent_map(em);
5069 else if (em->block_start == EXTENT_MAP_INLINE && page)
5070 free_extent_map(em);
5074 em = alloc_extent_map(GFP_NOFS);
5079 em->bdev = root->fs_info->fs_devices->latest_bdev;
5080 em->start = EXTENT_MAP_HOLE;
5081 em->orig_start = EXTENT_MAP_HOLE;
5083 em->block_len = (u64)-1;
5086 path = btrfs_alloc_path();
5090 ret = btrfs_lookup_file_extent(trans, root, path,
5091 objectid, start, trans != NULL);
5098 if (path->slots[0] == 0)
5103 leaf = path->nodes[0];
5104 item = btrfs_item_ptr(leaf, path->slots[0],
5105 struct btrfs_file_extent_item);
5106 /* are we inside the extent that was found? */
5107 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
5108 found_type = btrfs_key_type(&found_key);
5109 if (found_key.objectid != objectid ||
5110 found_type != BTRFS_EXTENT_DATA_KEY) {
5114 found_type = btrfs_file_extent_type(leaf, item);
5115 extent_start = found_key.offset;
5116 compress_type = btrfs_file_extent_compression(leaf, item);
5117 if (found_type == BTRFS_FILE_EXTENT_REG ||
5118 found_type == BTRFS_FILE_EXTENT_PREALLOC) {
5119 extent_end = extent_start +
5120 btrfs_file_extent_num_bytes(leaf, item);
5121 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
5123 size = btrfs_file_extent_inline_len(leaf, item);
5124 extent_end = (extent_start + size + root->sectorsize - 1) &
5125 ~((u64)root->sectorsize - 1);
5128 if (start >= extent_end) {
5130 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
5131 ret = btrfs_next_leaf(root, path);
5138 leaf = path->nodes[0];
5140 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
5141 if (found_key.objectid != objectid ||
5142 found_key.type != BTRFS_EXTENT_DATA_KEY)
5144 if (start + len <= found_key.offset)
5147 em->len = found_key.offset - start;
5151 if (found_type == BTRFS_FILE_EXTENT_REG ||
5152 found_type == BTRFS_FILE_EXTENT_PREALLOC) {
5153 em->start = extent_start;
5154 em->len = extent_end - extent_start;
5155 em->orig_start = extent_start -
5156 btrfs_file_extent_offset(leaf, item);
5157 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
5159 em->block_start = EXTENT_MAP_HOLE;
5162 if (compress_type != BTRFS_COMPRESS_NONE) {
5163 set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
5164 em->compress_type = compress_type;
5165 em->block_start = bytenr;
5166 em->block_len = btrfs_file_extent_disk_num_bytes(leaf,
5169 bytenr += btrfs_file_extent_offset(leaf, item);
5170 em->block_start = bytenr;
5171 em->block_len = em->len;
5172 if (found_type == BTRFS_FILE_EXTENT_PREALLOC)
5173 set_bit(EXTENT_FLAG_PREALLOC, &em->flags);
5176 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
5180 size_t extent_offset;
5183 em->block_start = EXTENT_MAP_INLINE;
5184 if (!page || create) {
5185 em->start = extent_start;
5186 em->len = extent_end - extent_start;
5190 size = btrfs_file_extent_inline_len(leaf, item);
5191 extent_offset = page_offset(page) + pg_offset - extent_start;
5192 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
5193 size - extent_offset);
5194 em->start = extent_start + extent_offset;
5195 em->len = (copy_size + root->sectorsize - 1) &
5196 ~((u64)root->sectorsize - 1);
5197 em->orig_start = EXTENT_MAP_INLINE;
5198 if (compress_type) {
5199 set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
5200 em->compress_type = compress_type;
5202 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
5203 if (create == 0 && !PageUptodate(page)) {
5204 if (btrfs_file_extent_compression(leaf, item) !=
5205 BTRFS_COMPRESS_NONE) {
5206 ret = uncompress_inline(path, inode, page,
5208 extent_offset, item);
5212 read_extent_buffer(leaf, map + pg_offset, ptr,
5214 if (pg_offset + copy_size < PAGE_CACHE_SIZE) {
5215 memset(map + pg_offset + copy_size, 0,
5216 PAGE_CACHE_SIZE - pg_offset -
5221 flush_dcache_page(page);
5222 } else if (create && PageUptodate(page)) {
5226 free_extent_map(em);
5228 btrfs_release_path(root, path);
5229 trans = btrfs_join_transaction(root, 1);
5231 return ERR_CAST(trans);
5235 write_extent_buffer(leaf, map + pg_offset, ptr,
5238 btrfs_mark_buffer_dirty(leaf);
5240 set_extent_uptodate(io_tree, em->start,
5241 extent_map_end(em) - 1, NULL, GFP_NOFS);
5244 printk(KERN_ERR "btrfs unknown found_type %d\n", found_type);
5251 em->block_start = EXTENT_MAP_HOLE;
5252 set_bit(EXTENT_FLAG_VACANCY, &em->flags);
5254 btrfs_release_path(root, path);
5255 if (em->start > start || extent_map_end(em) <= start) {
5256 printk(KERN_ERR "Btrfs: bad extent! em: [%llu %llu] passed "
5257 "[%llu %llu]\n", (unsigned long long)em->start,
5258 (unsigned long long)em->len,
5259 (unsigned long long)start,
5260 (unsigned long long)len);
5266 write_lock(&em_tree->lock);
5267 ret = add_extent_mapping(em_tree, em);
5268 /* it is possible that someone inserted the extent into the tree
5269 * while we had the lock dropped. It is also possible that
5270 * an overlapping map exists in the tree
5272 if (ret == -EEXIST) {
5273 struct extent_map *existing;
5277 existing = lookup_extent_mapping(em_tree, start, len);
5278 if (existing && (existing->start > start ||
5279 existing->start + existing->len <= start)) {
5280 free_extent_map(existing);
5284 existing = lookup_extent_mapping(em_tree, em->start,
5287 err = merge_extent_mapping(em_tree, existing,
5290 free_extent_map(existing);
5292 free_extent_map(em);
5297 free_extent_map(em);
5301 free_extent_map(em);
5306 write_unlock(&em_tree->lock);
5309 trace_btrfs_get_extent(root, em);
5312 btrfs_free_path(path);
5314 ret = btrfs_end_transaction(trans, root);
5319 free_extent_map(em);
5320 return ERR_PTR(err);
5325 struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page,
5326 size_t pg_offset, u64 start, u64 len,
5329 struct extent_map *em;
5330 struct extent_map *hole_em = NULL;
5331 u64 range_start = start;
5337 em = btrfs_get_extent(inode, page, pg_offset, start, len, create);
5342 * if our em maps to a hole, there might
5343 * actually be delalloc bytes behind it
5345 if (em->block_start != EXTENT_MAP_HOLE)
5351 /* check to see if we've wrapped (len == -1 or similar) */
5360 /* ok, we didn't find anything, lets look for delalloc */
5361 found = count_range_bits(&BTRFS_I(inode)->io_tree, &range_start,
5362 end, len, EXTENT_DELALLOC, 1);
5363 found_end = range_start + found;
5364 if (found_end < range_start)
5365 found_end = (u64)-1;
5368 * we didn't find anything useful, return
5369 * the original results from get_extent()
5371 if (range_start > end || found_end <= start) {
5377 /* adjust the range_start to make sure it doesn't
5378 * go backwards from the start they passed in
5380 range_start = max(start,range_start);
5381 found = found_end - range_start;
5384 u64 hole_start = start;
5387 em = alloc_extent_map(GFP_NOFS);
5393 * when btrfs_get_extent can't find anything it
5394 * returns one huge hole
5396 * make sure what it found really fits our range, and
5397 * adjust to make sure it is based on the start from
5401 u64 calc_end = extent_map_end(hole_em);
5403 if (calc_end <= start || (hole_em->start > end)) {
5404 free_extent_map(hole_em);
5407 hole_start = max(hole_em->start, start);
5408 hole_len = calc_end - hole_start;
5412 if (hole_em && range_start > hole_start) {
5413 /* our hole starts before our delalloc, so we
5414 * have to return just the parts of the hole
5415 * that go until the delalloc starts
5417 em->len = min(hole_len,
5418 range_start - hole_start);
5419 em->start = hole_start;
5420 em->orig_start = hole_start;
5422 * don't adjust block start at all,
5423 * it is fixed at EXTENT_MAP_HOLE
5425 em->block_start = hole_em->block_start;
5426 em->block_len = hole_len;
5428 em->start = range_start;
5430 em->orig_start = range_start;
5431 em->block_start = EXTENT_MAP_DELALLOC;
5432 em->block_len = found;
5434 } else if (hole_em) {
5439 free_extent_map(hole_em);
5441 free_extent_map(em);
5442 return ERR_PTR(err);
5447 static struct extent_map *btrfs_new_extent_direct(struct inode *inode,
5448 struct extent_map *em,
5451 struct btrfs_root *root = BTRFS_I(inode)->root;
5452 struct btrfs_trans_handle *trans;
5453 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
5454 struct btrfs_key ins;
5457 bool insert = false;
5460 * Ok if the extent map we looked up is a hole and is for the exact
5461 * range we want, there is no reason to allocate a new one, however if
5462 * it is not right then we need to free this one and drop the cache for
5465 if (em->block_start != EXTENT_MAP_HOLE || em->start != start ||
5467 free_extent_map(em);
5470 btrfs_drop_extent_cache(inode, start, start + len - 1, 0);
5473 trans = btrfs_join_transaction(root, 0);
5475 return ERR_CAST(trans);
5477 trans->block_rsv = &root->fs_info->delalloc_block_rsv;
5479 alloc_hint = get_extent_allocation_hint(inode, start, len);
5480 ret = btrfs_reserve_extent(trans, root, len, root->sectorsize, 0,
5481 alloc_hint, (u64)-1, &ins, 1);
5488 em = alloc_extent_map(GFP_NOFS);
5490 em = ERR_PTR(-ENOMEM);
5496 em->orig_start = em->start;
5497 em->len = ins.offset;
5499 em->block_start = ins.objectid;
5500 em->block_len = ins.offset;
5501 em->bdev = root->fs_info->fs_devices->latest_bdev;
5504 * We need to do this because if we're using the original em we searched
5505 * for, we could have EXTENT_FLAG_VACANCY set, and we don't want that.
5508 set_bit(EXTENT_FLAG_PINNED, &em->flags);
5511 write_lock(&em_tree->lock);
5512 ret = add_extent_mapping(em_tree, em);
5513 write_unlock(&em_tree->lock);
5516 btrfs_drop_extent_cache(inode, start, start + em->len - 1, 0);
5519 ret = btrfs_add_ordered_extent_dio(inode, start, ins.objectid,
5520 ins.offset, ins.offset, 0);
5522 btrfs_free_reserved_extent(root, ins.objectid, ins.offset);
5526 btrfs_end_transaction(trans, root);
5531 * returns 1 when the nocow is safe, < 1 on error, 0 if the
5532 * block must be cow'd
5534 static noinline int can_nocow_odirect(struct btrfs_trans_handle *trans,
5535 struct inode *inode, u64 offset, u64 len)
5537 struct btrfs_path *path;
5539 struct extent_buffer *leaf;
5540 struct btrfs_root *root = BTRFS_I(inode)->root;
5541 struct btrfs_file_extent_item *fi;
5542 struct btrfs_key key;
5550 path = btrfs_alloc_path();
5554 ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino,
5559 slot = path->slots[0];
5562 /* can't find the item, must cow */
5569 leaf = path->nodes[0];
5570 btrfs_item_key_to_cpu(leaf, &key, slot);
5571 if (key.objectid != inode->i_ino ||
5572 key.type != BTRFS_EXTENT_DATA_KEY) {
5573 /* not our file or wrong item type, must cow */
5577 if (key.offset > offset) {
5578 /* Wrong offset, must cow */
5582 fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
5583 found_type = btrfs_file_extent_type(leaf, fi);
5584 if (found_type != BTRFS_FILE_EXTENT_REG &&
5585 found_type != BTRFS_FILE_EXTENT_PREALLOC) {
5586 /* not a regular extent, must cow */
5589 disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
5590 backref_offset = btrfs_file_extent_offset(leaf, fi);
5592 extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
5593 if (extent_end < offset + len) {
5594 /* extent doesn't include our full range, must cow */
5598 if (btrfs_extent_readonly(root, disk_bytenr))
5602 * look for other files referencing this extent, if we
5603 * find any we must cow
5605 if (btrfs_cross_ref_exist(trans, root, inode->i_ino,
5606 key.offset - backref_offset, disk_bytenr))
5610 * adjust disk_bytenr and num_bytes to cover just the bytes
5611 * in this extent we are about to write. If there
5612 * are any csums in that range we have to cow in order
5613 * to keep the csums correct
5615 disk_bytenr += backref_offset;
5616 disk_bytenr += offset - key.offset;
5617 num_bytes = min(offset + len, extent_end) - offset;
5618 if (csum_exist_in_range(root, disk_bytenr, num_bytes))
5621 * all of the above have passed, it is safe to overwrite this extent
5626 btrfs_free_path(path);
5630 static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock,
5631 struct buffer_head *bh_result, int create)
5633 struct extent_map *em;
5634 struct btrfs_root *root = BTRFS_I(inode)->root;
5635 u64 start = iblock << inode->i_blkbits;
5636 u64 len = bh_result->b_size;
5637 struct btrfs_trans_handle *trans;
5639 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
5644 * Ok for INLINE and COMPRESSED extents we need to fallback on buffered
5645 * io. INLINE is special, and we could probably kludge it in here, but
5646 * it's still buffered so for safety lets just fall back to the generic
5649 * For COMPRESSED we _have_ to read the entire extent in so we can
5650 * decompress it, so there will be buffering required no matter what we
5651 * do, so go ahead and fallback to buffered.
5653 * We return -ENOTBLK because thats what makes DIO go ahead and go back
5654 * to buffered IO. Don't blame me, this is the price we pay for using
5657 if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) ||
5658 em->block_start == EXTENT_MAP_INLINE) {
5659 free_extent_map(em);
5663 /* Just a good old fashioned hole, return */
5664 if (!create && (em->block_start == EXTENT_MAP_HOLE ||
5665 test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) {
5666 free_extent_map(em);
5667 /* DIO will do one hole at a time, so just unlock a sector */
5668 unlock_extent(&BTRFS_I(inode)->io_tree, start,
5669 start + root->sectorsize - 1, GFP_NOFS);
5674 * We don't allocate a new extent in the following cases
5676 * 1) The inode is marked as NODATACOW. In this case we'll just use the
5678 * 2) The extent is marked as PREALLOC. We're good to go here and can
5679 * just use the extent.
5683 len = em->len - (start - em->start);
5687 if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) ||
5688 ((BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) &&
5689 em->block_start != EXTENT_MAP_HOLE)) {
5694 if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
5695 type = BTRFS_ORDERED_PREALLOC;
5697 type = BTRFS_ORDERED_NOCOW;
5698 len = min(len, em->len - (start - em->start));
5699 block_start = em->block_start + (start - em->start);
5702 * we're not going to log anything, but we do need
5703 * to make sure the current transaction stays open
5704 * while we look for nocow cross refs
5706 trans = btrfs_join_transaction(root, 0);
5710 if (can_nocow_odirect(trans, inode, start, len) == 1) {
5711 ret = btrfs_add_ordered_extent_dio(inode, start,
5712 block_start, len, len, type);
5713 btrfs_end_transaction(trans, root);
5715 free_extent_map(em);
5720 btrfs_end_transaction(trans, root);
5724 * this will cow the extent, reset the len in case we changed
5727 len = bh_result->b_size;
5728 em = btrfs_new_extent_direct(inode, em, start, len);
5731 len = min(len, em->len - (start - em->start));
5733 clear_extent_bit(&BTRFS_I(inode)->io_tree, start, start + len - 1,
5734 EXTENT_LOCKED | EXTENT_DELALLOC | EXTENT_DIRTY, 1,
5737 bh_result->b_blocknr = (em->block_start + (start - em->start)) >>
5739 bh_result->b_size = len;
5740 bh_result->b_bdev = em->bdev;
5741 set_buffer_mapped(bh_result);
5742 if (create && !test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
5743 set_buffer_new(bh_result);
5745 free_extent_map(em);
5750 struct btrfs_dio_private {
5751 struct inode *inode;
5758 /* number of bios pending for this dio */
5759 atomic_t pending_bios;
5764 struct bio *orig_bio;
5767 static void btrfs_endio_direct_read(struct bio *bio, int err)
5769 struct btrfs_dio_private *dip = bio->bi_private;
5770 struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1;
5771 struct bio_vec *bvec = bio->bi_io_vec;
5772 struct inode *inode = dip->inode;
5773 struct btrfs_root *root = BTRFS_I(inode)->root;
5775 u32 *private = dip->csums;
5777 start = dip->logical_offset;
5779 if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) {
5780 struct page *page = bvec->bv_page;
5783 unsigned long flags;
5785 local_irq_save(flags);
5786 kaddr = kmap_atomic(page, KM_IRQ0);
5787 csum = btrfs_csum_data(root, kaddr + bvec->bv_offset,
5788 csum, bvec->bv_len);
5789 btrfs_csum_final(csum, (char *)&csum);
5790 kunmap_atomic(kaddr, KM_IRQ0);
5791 local_irq_restore(flags);
5793 flush_dcache_page(bvec->bv_page);
5794 if (csum != *private) {
5795 printk(KERN_ERR "btrfs csum failed ino %lu off"
5796 " %llu csum %u private %u\n",
5797 inode->i_ino, (unsigned long long)start,
5803 start += bvec->bv_len;
5806 } while (bvec <= bvec_end);
5808 unlock_extent(&BTRFS_I(inode)->io_tree, dip->logical_offset,
5809 dip->logical_offset + dip->bytes - 1, GFP_NOFS);
5810 bio->bi_private = dip->private;
5815 /* If we had a csum failure make sure to clear the uptodate flag */
5817 clear_bit(BIO_UPTODATE, &bio->bi_flags);
5818 dio_end_io(bio, err);
5821 static void btrfs_endio_direct_write(struct bio *bio, int err)
5823 struct btrfs_dio_private *dip = bio->bi_private;
5824 struct inode *inode = dip->inode;
5825 struct btrfs_root *root = BTRFS_I(inode)->root;
5826 struct btrfs_trans_handle *trans;
5827 struct btrfs_ordered_extent *ordered = NULL;
5828 struct extent_state *cached_state = NULL;
5829 u64 ordered_offset = dip->logical_offset;
5830 u64 ordered_bytes = dip->bytes;
5836 ret = btrfs_dec_test_first_ordered_pending(inode, &ordered,
5844 trans = btrfs_join_transaction(root, 1);
5845 if (IS_ERR(trans)) {
5849 trans->block_rsv = &root->fs_info->delalloc_block_rsv;
5851 if (test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags)) {
5852 ret = btrfs_ordered_update_i_size(inode, 0, ordered);
5854 ret = btrfs_update_inode(trans, root, inode);
5859 lock_extent_bits(&BTRFS_I(inode)->io_tree, ordered->file_offset,
5860 ordered->file_offset + ordered->len - 1, 0,
5861 &cached_state, GFP_NOFS);
5863 if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags)) {
5864 ret = btrfs_mark_extent_written(trans, inode,
5865 ordered->file_offset,
5866 ordered->file_offset +
5873 ret = insert_reserved_file_extent(trans, inode,
5874 ordered->file_offset,
5880 BTRFS_FILE_EXTENT_REG);
5881 unpin_extent_cache(&BTRFS_I(inode)->extent_tree,
5882 ordered->file_offset, ordered->len);
5890 add_pending_csums(trans, inode, ordered->file_offset, &ordered->list);
5891 ret = btrfs_ordered_update_i_size(inode, 0, ordered);
5893 btrfs_update_inode(trans, root, inode);
5896 unlock_extent_cached(&BTRFS_I(inode)->io_tree, ordered->file_offset,
5897 ordered->file_offset + ordered->len - 1,
5898 &cached_state, GFP_NOFS);
5900 btrfs_delalloc_release_metadata(inode, ordered->len);
5901 btrfs_end_transaction(trans, root);
5902 ordered_offset = ordered->file_offset + ordered->len;
5903 btrfs_put_ordered_extent(ordered);
5904 btrfs_put_ordered_extent(ordered);
5908 * our bio might span multiple ordered extents. If we haven't
5909 * completed the accounting for the whole dio, go back and try again
5911 if (ordered_offset < dip->logical_offset + dip->bytes) {
5912 ordered_bytes = dip->logical_offset + dip->bytes -
5917 bio->bi_private = dip->private;
5922 /* If we had an error make sure to clear the uptodate flag */
5924 clear_bit(BIO_UPTODATE, &bio->bi_flags);
5925 dio_end_io(bio, err);
5928 static int __btrfs_submit_bio_start_direct_io(struct inode *inode, int rw,
5929 struct bio *bio, int mirror_num,
5930 unsigned long bio_flags, u64 offset)
5933 struct btrfs_root *root = BTRFS_I(inode)->root;
5934 ret = btrfs_csum_one_bio(root, inode, bio, offset, 1);
5939 static void btrfs_end_dio_bio(struct bio *bio, int err)
5941 struct btrfs_dio_private *dip = bio->bi_private;
5944 printk(KERN_ERR "btrfs direct IO failed ino %lu rw %lu "
5945 "sector %#Lx len %u err no %d\n",
5946 dip->inode->i_ino, bio->bi_rw,
5947 (unsigned long long)bio->bi_sector, bio->bi_size, err);
5951 * before atomic variable goto zero, we must make sure
5952 * dip->errors is perceived to be set.
5954 smp_mb__before_atomic_dec();
5957 /* if there are more bios still pending for this dio, just exit */
5958 if (!atomic_dec_and_test(&dip->pending_bios))
5962 bio_io_error(dip->orig_bio);
5964 set_bit(BIO_UPTODATE, &dip->orig_bio->bi_flags);
5965 bio_endio(dip->orig_bio, 0);
5971 static struct bio *btrfs_dio_bio_alloc(struct block_device *bdev,
5972 u64 first_sector, gfp_t gfp_flags)
5974 int nr_vecs = bio_get_nr_vecs(bdev);
5975 return btrfs_bio_alloc(bdev, first_sector, nr_vecs, gfp_flags);
5978 static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode,
5979 int rw, u64 file_offset, int skip_sum,
5980 u32 *csums, int async_submit)
5982 int write = rw & REQ_WRITE;
5983 struct btrfs_root *root = BTRFS_I(inode)->root;
5987 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
5994 if (write && async_submit) {
5995 ret = btrfs_wq_submit_bio(root->fs_info,
5996 inode, rw, bio, 0, 0,
5998 __btrfs_submit_bio_start_direct_io,
5999 __btrfs_submit_bio_done);
6003 * If we aren't doing async submit, calculate the csum of the
6006 ret = btrfs_csum_one_bio(root, inode, bio, file_offset, 1);
6009 } else if (!skip_sum) {
6010 ret = btrfs_lookup_bio_sums_dio(root, inode, bio,
6011 file_offset, csums);
6017 ret = btrfs_map_bio(root, rw, bio, 0, async_submit);
6023 static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip,
6026 struct inode *inode = dip->inode;
6027 struct btrfs_root *root = BTRFS_I(inode)->root;
6028 struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree;
6030 struct bio *orig_bio = dip->orig_bio;
6031 struct bio_vec *bvec = orig_bio->bi_io_vec;
6032 u64 start_sector = orig_bio->bi_sector;
6033 u64 file_offset = dip->logical_offset;
6037 u32 *csums = dip->csums;
6039 int async_submit = 0;
6040 int write = rw & REQ_WRITE;
6042 map_length = orig_bio->bi_size;
6043 ret = btrfs_map_block(map_tree, READ, start_sector << 9,
6044 &map_length, NULL, 0);
6050 if (map_length >= orig_bio->bi_size) {
6056 bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS);
6059 bio->bi_private = dip;
6060 bio->bi_end_io = btrfs_end_dio_bio;
6061 atomic_inc(&dip->pending_bios);
6063 while (bvec <= (orig_bio->bi_io_vec + orig_bio->bi_vcnt - 1)) {
6064 if (unlikely(map_length < submit_len + bvec->bv_len ||
6065 bio_add_page(bio, bvec->bv_page, bvec->bv_len,
6066 bvec->bv_offset) < bvec->bv_len)) {
6068 * inc the count before we submit the bio so
6069 * we know the end IO handler won't happen before
6070 * we inc the count. Otherwise, the dip might get freed
6071 * before we're done setting it up
6073 atomic_inc(&dip->pending_bios);
6074 ret = __btrfs_submit_dio_bio(bio, inode, rw,
6075 file_offset, skip_sum,
6076 csums, async_submit);
6079 atomic_dec(&dip->pending_bios);
6083 /* Write's use the ordered csums */
6084 if (!write && !skip_sum)
6085 csums = csums + nr_pages;
6086 start_sector += submit_len >> 9;
6087 file_offset += submit_len;
6092 bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev,
6093 start_sector, GFP_NOFS);
6096 bio->bi_private = dip;
6097 bio->bi_end_io = btrfs_end_dio_bio;
6099 map_length = orig_bio->bi_size;
6100 ret = btrfs_map_block(map_tree, READ, start_sector << 9,
6101 &map_length, NULL, 0);
6107 submit_len += bvec->bv_len;
6114 ret = __btrfs_submit_dio_bio(bio, inode, rw, file_offset, skip_sum,
6115 csums, async_submit);
6123 * before atomic variable goto zero, we must
6124 * make sure dip->errors is perceived to be set.
6126 smp_mb__before_atomic_dec();
6127 if (atomic_dec_and_test(&dip->pending_bios))
6128 bio_io_error(dip->orig_bio);
6130 /* bio_end_io() will handle error, so we needn't return it */
6134 static void btrfs_submit_direct(int rw, struct bio *bio, struct inode *inode,
6137 struct btrfs_root *root = BTRFS_I(inode)->root;
6138 struct btrfs_dio_private *dip;
6139 struct bio_vec *bvec = bio->bi_io_vec;
6141 int write = rw & REQ_WRITE;
6144 skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
6146 dip = kmalloc(sizeof(*dip), GFP_NOFS);
6153 /* Write's use the ordered csum stuff, so we don't need dip->csums */
6154 if (!write && !skip_sum) {
6155 dip->csums = kmalloc(sizeof(u32) * bio->bi_vcnt, GFP_NOFS);
6163 dip->private = bio->bi_private;
6165 dip->logical_offset = file_offset;
6169 dip->bytes += bvec->bv_len;
6171 } while (bvec <= (bio->bi_io_vec + bio->bi_vcnt - 1));
6173 dip->disk_bytenr = (u64)bio->bi_sector << 9;
6174 bio->bi_private = dip;
6176 dip->orig_bio = bio;
6177 atomic_set(&dip->pending_bios, 0);
6180 bio->bi_end_io = btrfs_endio_direct_write;
6182 bio->bi_end_io = btrfs_endio_direct_read;
6184 ret = btrfs_submit_direct_hook(rw, dip, skip_sum);
6189 * If this is a write, we need to clean up the reserved space and kill
6190 * the ordered extent.
6193 struct btrfs_ordered_extent *ordered;
6194 ordered = btrfs_lookup_ordered_extent(inode, file_offset);
6195 if (!test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags) &&
6196 !test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags))
6197 btrfs_free_reserved_extent(root, ordered->start,
6199 btrfs_put_ordered_extent(ordered);
6200 btrfs_put_ordered_extent(ordered);
6202 bio_endio(bio, ret);
6205 static ssize_t check_direct_IO(struct btrfs_root *root, int rw, struct kiocb *iocb,
6206 const struct iovec *iov, loff_t offset,
6207 unsigned long nr_segs)
6213 unsigned blocksize_mask = root->sectorsize - 1;
6214 ssize_t retval = -EINVAL;
6215 loff_t end = offset;
6217 if (offset & blocksize_mask)
6220 /* Check the memory alignment. Blocks cannot straddle pages */
6221 for (seg = 0; seg < nr_segs; seg++) {
6222 addr = (unsigned long)iov[seg].iov_base;
6223 size = iov[seg].iov_len;
6225 if ((addr & blocksize_mask) || (size & blocksize_mask))
6228 /* If this is a write we don't need to check anymore */
6233 * Check to make sure we don't have duplicate iov_base's in this
6234 * iovec, if so return EINVAL, otherwise we'll get csum errors
6235 * when reading back.
6237 for (i = seg + 1; i < nr_segs; i++) {
6238 if (iov[seg].iov_base == iov[i].iov_base)
6246 static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
6247 const struct iovec *iov, loff_t offset,
6248 unsigned long nr_segs)
6250 struct file *file = iocb->ki_filp;
6251 struct inode *inode = file->f_mapping->host;
6252 struct btrfs_ordered_extent *ordered;
6253 struct extent_state *cached_state = NULL;
6254 u64 lockstart, lockend;
6256 int writing = rw & WRITE;
6258 size_t count = iov_length(iov, nr_segs);
6260 if (check_direct_IO(BTRFS_I(inode)->root, rw, iocb, iov,
6266 lockend = offset + count - 1;
6269 ret = btrfs_delalloc_reserve_space(inode, count);
6275 lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend,
6276 0, &cached_state, GFP_NOFS);
6278 * We're concerned with the entire range that we're going to be
6279 * doing DIO to, so we need to make sure theres no ordered
6280 * extents in this range.
6282 ordered = btrfs_lookup_ordered_range(inode, lockstart,
6283 lockend - lockstart + 1);
6286 unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend,
6287 &cached_state, GFP_NOFS);
6288 btrfs_start_ordered_extent(inode, ordered, 1);
6289 btrfs_put_ordered_extent(ordered);
6294 * we don't use btrfs_set_extent_delalloc because we don't want
6295 * the dirty or uptodate bits
6298 write_bits = EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING;
6299 ret = set_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend,
6300 EXTENT_DELALLOC, 0, NULL, &cached_state,
6303 clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart,
6304 lockend, EXTENT_LOCKED | write_bits,
6305 1, 0, &cached_state, GFP_NOFS);
6310 free_extent_state(cached_state);
6311 cached_state = NULL;
6313 ret = __blockdev_direct_IO(rw, iocb, inode,
6314 BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev,
6315 iov, offset, nr_segs, btrfs_get_blocks_direct, NULL,
6316 btrfs_submit_direct, 0);
6318 if (ret < 0 && ret != -EIOCBQUEUED) {
6319 clear_extent_bit(&BTRFS_I(inode)->io_tree, offset,
6320 offset + iov_length(iov, nr_segs) - 1,
6321 EXTENT_LOCKED | write_bits, 1, 0,
6322 &cached_state, GFP_NOFS);
6323 } else if (ret >= 0 && ret < iov_length(iov, nr_segs)) {
6325 * We're falling back to buffered, unlock the section we didn't
6328 clear_extent_bit(&BTRFS_I(inode)->io_tree, offset + ret,
6329 offset + iov_length(iov, nr_segs) - 1,
6330 EXTENT_LOCKED | write_bits, 1, 0,
6331 &cached_state, GFP_NOFS);
6334 free_extent_state(cached_state);
6338 static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
6339 __u64 start, __u64 len)
6341 return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent_fiemap);
6344 int btrfs_readpage(struct file *file, struct page *page)
6346 struct extent_io_tree *tree;
6347 tree = &BTRFS_I(page->mapping->host)->io_tree;
6348 return extent_read_full_page(tree, page, btrfs_get_extent);
6351 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
6353 struct extent_io_tree *tree;
6356 if (current->flags & PF_MEMALLOC) {
6357 redirty_page_for_writepage(wbc, page);
6361 tree = &BTRFS_I(page->mapping->host)->io_tree;
6362 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
6365 int btrfs_writepages(struct address_space *mapping,
6366 struct writeback_control *wbc)
6368 struct extent_io_tree *tree;
6370 tree = &BTRFS_I(mapping->host)->io_tree;
6371 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
6375 btrfs_readpages(struct file *file, struct address_space *mapping,
6376 struct list_head *pages, unsigned nr_pages)
6378 struct extent_io_tree *tree;
6379 tree = &BTRFS_I(mapping->host)->io_tree;
6380 return extent_readpages(tree, mapping, pages, nr_pages,
6383 static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags)
6385 struct extent_io_tree *tree;
6386 struct extent_map_tree *map;
6389 tree = &BTRFS_I(page->mapping->host)->io_tree;
6390 map = &BTRFS_I(page->mapping->host)->extent_tree;
6391 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
6393 ClearPagePrivate(page);
6394 set_page_private(page, 0);
6395 page_cache_release(page);
6400 static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
6402 if (PageWriteback(page) || PageDirty(page))
6404 return __btrfs_releasepage(page, gfp_flags & GFP_NOFS);
6407 static void btrfs_invalidatepage(struct page *page, unsigned long offset)
6409 struct extent_io_tree *tree;
6410 struct btrfs_ordered_extent *ordered;
6411 struct extent_state *cached_state = NULL;
6412 u64 page_start = page_offset(page);
6413 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
6417 * we have the page locked, so new writeback can't start,
6418 * and the dirty bit won't be cleared while we are here.
6420 * Wait for IO on this page so that we can safely clear
6421 * the PagePrivate2 bit and do ordered accounting
6423 wait_on_page_writeback(page);
6425 tree = &BTRFS_I(page->mapping->host)->io_tree;
6427 btrfs_releasepage(page, GFP_NOFS);
6430 lock_extent_bits(tree, page_start, page_end, 0, &cached_state,
6432 ordered = btrfs_lookup_ordered_extent(page->mapping->host,
6436 * IO on this page will never be started, so we need
6437 * to account for any ordered extents now
6439 clear_extent_bit(tree, page_start, page_end,
6440 EXTENT_DIRTY | EXTENT_DELALLOC |
6441 EXTENT_LOCKED | EXTENT_DO_ACCOUNTING, 1, 0,
6442 &cached_state, GFP_NOFS);
6444 * whoever cleared the private bit is responsible
6445 * for the finish_ordered_io
6447 if (TestClearPagePrivate2(page)) {
6448 btrfs_finish_ordered_io(page->mapping->host,
6449 page_start, page_end);
6451 btrfs_put_ordered_extent(ordered);
6452 cached_state = NULL;
6453 lock_extent_bits(tree, page_start, page_end, 0, &cached_state,
6456 clear_extent_bit(tree, page_start, page_end,
6457 EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC |
6458 EXTENT_DO_ACCOUNTING, 1, 1, &cached_state, GFP_NOFS);
6459 __btrfs_releasepage(page, GFP_NOFS);
6461 ClearPageChecked(page);
6462 if (PagePrivate(page)) {
6463 ClearPagePrivate(page);
6464 set_page_private(page, 0);
6465 page_cache_release(page);
6470 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
6471 * called from a page fault handler when a page is first dirtied. Hence we must
6472 * be careful to check for EOF conditions here. We set the page up correctly
6473 * for a written page which means we get ENOSPC checking when writing into
6474 * holes and correct delalloc and unwritten extent mapping on filesystems that
6475 * support these features.
6477 * We are not allowed to take the i_mutex here so we have to play games to
6478 * protect against truncate races as the page could now be beyond EOF. Because
6479 * vmtruncate() writes the inode size before removing pages, once we have the
6480 * page lock we can determine safely if the page is beyond EOF. If it is not
6481 * beyond EOF, then the page is guaranteed safe against truncation until we
6484 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
6486 struct page *page = vmf->page;
6487 struct inode *inode = fdentry(vma->vm_file)->d_inode;
6488 struct btrfs_root *root = BTRFS_I(inode)->root;
6489 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
6490 struct btrfs_ordered_extent *ordered;
6491 struct extent_state *cached_state = NULL;
6493 unsigned long zero_start;
6499 ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE);
6503 else /* -ENOSPC, -EIO, etc */
6504 ret = VM_FAULT_SIGBUS;
6508 ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */
6511 size = i_size_read(inode);
6512 page_start = page_offset(page);
6513 page_end = page_start + PAGE_CACHE_SIZE - 1;
6515 if ((page->mapping != inode->i_mapping) ||
6516 (page_start >= size)) {
6517 /* page got truncated out from underneath us */
6520 wait_on_page_writeback(page);
6522 lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state,
6524 set_page_extent_mapped(page);
6527 * we can't set the delalloc bits if there are pending ordered
6528 * extents. Drop our locks and wait for them to finish
6530 ordered = btrfs_lookup_ordered_extent(inode, page_start);
6532 unlock_extent_cached(io_tree, page_start, page_end,
6533 &cached_state, GFP_NOFS);
6535 btrfs_start_ordered_extent(inode, ordered, 1);
6536 btrfs_put_ordered_extent(ordered);
6541 * XXX - page_mkwrite gets called every time the page is dirtied, even
6542 * if it was already dirty, so for space accounting reasons we need to
6543 * clear any delalloc bits for the range we are fixing to save. There
6544 * is probably a better way to do this, but for now keep consistent with
6545 * prepare_pages in the normal write path.
6547 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end,
6548 EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING,
6549 0, 0, &cached_state, GFP_NOFS);
6551 ret = btrfs_set_extent_delalloc(inode, page_start, page_end,
6554 unlock_extent_cached(io_tree, page_start, page_end,
6555 &cached_state, GFP_NOFS);
6556 ret = VM_FAULT_SIGBUS;
6561 /* page is wholly or partially inside EOF */
6562 if (page_start + PAGE_CACHE_SIZE > size)
6563 zero_start = size & ~PAGE_CACHE_MASK;
6565 zero_start = PAGE_CACHE_SIZE;
6567 if (zero_start != PAGE_CACHE_SIZE) {
6569 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
6570 flush_dcache_page(page);
6573 ClearPageChecked(page);
6574 set_page_dirty(page);
6575 SetPageUptodate(page);
6577 BTRFS_I(inode)->last_trans = root->fs_info->generation;
6578 BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
6580 unlock_extent_cached(io_tree, page_start, page_end, &cached_state, GFP_NOFS);
6584 return VM_FAULT_LOCKED;
6586 btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE);
6591 static int btrfs_truncate(struct inode *inode)
6593 struct btrfs_root *root = BTRFS_I(inode)->root;
6596 struct btrfs_trans_handle *trans;
6598 u64 mask = root->sectorsize - 1;
6600 ret = btrfs_truncate_page(inode->i_mapping, inode->i_size);
6604 btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1);
6605 btrfs_ordered_update_i_size(inode, inode->i_size, NULL);
6607 trans = btrfs_start_transaction(root, 5);
6609 return PTR_ERR(trans);
6611 btrfs_set_trans_block_group(trans, inode);
6613 ret = btrfs_orphan_add(trans, inode);
6615 btrfs_end_transaction(trans, root);
6619 nr = trans->blocks_used;
6620 btrfs_end_transaction(trans, root);
6621 btrfs_btree_balance_dirty(root, nr);
6623 /* Now start a transaction for the truncate */
6624 trans = btrfs_start_transaction(root, 0);
6626 return PTR_ERR(trans);
6627 btrfs_set_trans_block_group(trans, inode);
6628 trans->block_rsv = root->orphan_block_rsv;
6631 * setattr is responsible for setting the ordered_data_close flag,
6632 * but that is only tested during the last file release. That
6633 * could happen well after the next commit, leaving a great big
6634 * window where new writes may get lost if someone chooses to write
6635 * to this file after truncating to zero
6637 * The inode doesn't have any dirty data here, and so if we commit
6638 * this is a noop. If someone immediately starts writing to the inode
6639 * it is very likely we'll catch some of their writes in this
6640 * transaction, and the commit will find this file on the ordered
6641 * data list with good things to send down.
6643 * This is a best effort solution, there is still a window where
6644 * using truncate to replace the contents of the file will
6645 * end up with a zero length file after a crash.
6647 if (inode->i_size == 0 && BTRFS_I(inode)->ordered_data_close)
6648 btrfs_add_ordered_operation(trans, root, inode);
6652 trans = btrfs_start_transaction(root, 0);
6654 return PTR_ERR(trans);
6655 btrfs_set_trans_block_group(trans, inode);
6656 trans->block_rsv = root->orphan_block_rsv;
6659 ret = btrfs_block_rsv_check(trans, root,
6660 root->orphan_block_rsv, 0, 5);
6661 if (ret == -EAGAIN) {
6662 ret = btrfs_commit_transaction(trans, root);
6672 ret = btrfs_truncate_inode_items(trans, root, inode,
6674 BTRFS_EXTENT_DATA_KEY);
6675 if (ret != -EAGAIN) {
6680 ret = btrfs_update_inode(trans, root, inode);
6686 nr = trans->blocks_used;
6687 btrfs_end_transaction(trans, root);
6689 btrfs_btree_balance_dirty(root, nr);
6692 if (ret == 0 && inode->i_nlink > 0) {
6693 ret = btrfs_orphan_del(trans, inode);
6696 } else if (ret && inode->i_nlink > 0) {
6698 * Failed to do the truncate, remove us from the in memory
6701 ret = btrfs_orphan_del(NULL, inode);
6704 ret = btrfs_update_inode(trans, root, inode);
6708 nr = trans->blocks_used;
6709 ret = btrfs_end_transaction_throttle(trans, root);
6712 btrfs_btree_balance_dirty(root, nr);
6718 * create a new subvolume directory/inode (helper for the ioctl).
6720 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
6721 struct btrfs_root *new_root,
6722 u64 new_dirid, u64 alloc_hint)
6724 struct inode *inode;
6728 inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, new_dirid,
6729 new_dirid, alloc_hint, S_IFDIR | 0700, &index);
6731 return PTR_ERR(inode);
6732 inode->i_op = &btrfs_dir_inode_operations;
6733 inode->i_fop = &btrfs_dir_file_operations;
6736 btrfs_i_size_write(inode, 0);
6738 err = btrfs_update_inode(trans, new_root, inode);
6745 /* helper function for file defrag and space balancing. This
6746 * forces readahead on a given range of bytes in an inode
6748 unsigned long btrfs_force_ra(struct address_space *mapping,
6749 struct file_ra_state *ra, struct file *file,
6750 pgoff_t offset, pgoff_t last_index)
6752 pgoff_t req_size = last_index - offset + 1;
6754 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
6755 return offset + req_size;
6758 struct inode *btrfs_alloc_inode(struct super_block *sb)
6760 struct btrfs_inode *ei;
6761 struct inode *inode;
6763 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
6768 ei->space_info = NULL;
6772 ei->last_sub_trans = 0;
6773 ei->logged_trans = 0;
6774 ei->delalloc_bytes = 0;
6775 ei->reserved_bytes = 0;
6776 ei->disk_i_size = 0;
6778 ei->index_cnt = (u64)-1;
6779 ei->last_unlink_trans = 0;
6781 atomic_set(&ei->outstanding_extents, 0);
6782 atomic_set(&ei->reserved_extents, 0);
6784 ei->ordered_data_close = 0;
6785 ei->orphan_meta_reserved = 0;
6786 ei->dummy_inode = 0;
6787 ei->force_compress = BTRFS_COMPRESS_NONE;
6789 inode = &ei->vfs_inode;
6790 extent_map_tree_init(&ei->extent_tree, GFP_NOFS);
6791 extent_io_tree_init(&ei->io_tree, &inode->i_data, GFP_NOFS);
6792 extent_io_tree_init(&ei->io_failure_tree, &inode->i_data, GFP_NOFS);
6793 mutex_init(&ei->log_mutex);
6794 btrfs_ordered_inode_tree_init(&ei->ordered_tree);
6795 INIT_LIST_HEAD(&ei->i_orphan);
6796 INIT_LIST_HEAD(&ei->delalloc_inodes);
6797 INIT_LIST_HEAD(&ei->ordered_operations);
6798 RB_CLEAR_NODE(&ei->rb_node);
6803 static void btrfs_i_callback(struct rcu_head *head)
6805 struct inode *inode = container_of(head, struct inode, i_rcu);
6806 INIT_LIST_HEAD(&inode->i_dentry);
6807 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
6810 void btrfs_destroy_inode(struct inode *inode)
6812 struct btrfs_ordered_extent *ordered;
6813 struct btrfs_root *root = BTRFS_I(inode)->root;
6815 WARN_ON(!list_empty(&inode->i_dentry));
6816 WARN_ON(inode->i_data.nrpages);
6817 WARN_ON(atomic_read(&BTRFS_I(inode)->outstanding_extents));
6818 WARN_ON(atomic_read(&BTRFS_I(inode)->reserved_extents));
6821 * This can happen where we create an inode, but somebody else also
6822 * created the same inode and we need to destroy the one we already
6829 * Make sure we're properly removed from the ordered operation
6833 if (!list_empty(&BTRFS_I(inode)->ordered_operations)) {
6834 spin_lock(&root->fs_info->ordered_extent_lock);
6835 list_del_init(&BTRFS_I(inode)->ordered_operations);
6836 spin_unlock(&root->fs_info->ordered_extent_lock);
6839 if (root == root->fs_info->tree_root) {
6840 struct btrfs_block_group_cache *block_group;
6842 block_group = btrfs_lookup_block_group(root->fs_info,
6843 BTRFS_I(inode)->block_group);
6844 if (block_group && block_group->inode == inode) {
6845 spin_lock(&block_group->lock);
6846 block_group->inode = NULL;
6847 spin_unlock(&block_group->lock);
6848 btrfs_put_block_group(block_group);
6849 } else if (block_group) {
6850 btrfs_put_block_group(block_group);
6854 spin_lock(&root->orphan_lock);
6855 if (!list_empty(&BTRFS_I(inode)->i_orphan)) {
6856 printk(KERN_INFO "BTRFS: inode %lu still on the orphan list\n",
6858 list_del_init(&BTRFS_I(inode)->i_orphan);
6860 spin_unlock(&root->orphan_lock);
6863 ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1);
6867 printk(KERN_ERR "btrfs found ordered "
6868 "extent %llu %llu on inode cleanup\n",
6869 (unsigned long long)ordered->file_offset,
6870 (unsigned long long)ordered->len);
6871 btrfs_remove_ordered_extent(inode, ordered);
6872 btrfs_put_ordered_extent(ordered);
6873 btrfs_put_ordered_extent(ordered);
6876 inode_tree_del(inode);
6877 btrfs_drop_extent_cache(inode, 0, (u64)-1, 0);
6879 call_rcu(&inode->i_rcu, btrfs_i_callback);
6882 int btrfs_drop_inode(struct inode *inode)
6884 struct btrfs_root *root = BTRFS_I(inode)->root;
6886 if (btrfs_root_refs(&root->root_item) == 0 &&
6887 root != root->fs_info->tree_root)
6890 return generic_drop_inode(inode);
6893 static void init_once(void *foo)
6895 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
6897 inode_init_once(&ei->vfs_inode);
6900 void btrfs_destroy_cachep(void)
6902 if (btrfs_inode_cachep)
6903 kmem_cache_destroy(btrfs_inode_cachep);
6904 if (btrfs_trans_handle_cachep)
6905 kmem_cache_destroy(btrfs_trans_handle_cachep);
6906 if (btrfs_transaction_cachep)
6907 kmem_cache_destroy(btrfs_transaction_cachep);
6908 if (btrfs_path_cachep)
6909 kmem_cache_destroy(btrfs_path_cachep);
6910 if (btrfs_free_space_cachep)
6911 kmem_cache_destroy(btrfs_free_space_cachep);
6914 int btrfs_init_cachep(void)
6916 btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache",
6917 sizeof(struct btrfs_inode), 0,
6918 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, init_once);
6919 if (!btrfs_inode_cachep)
6922 btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache",
6923 sizeof(struct btrfs_trans_handle), 0,
6924 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL);
6925 if (!btrfs_trans_handle_cachep)
6928 btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache",
6929 sizeof(struct btrfs_transaction), 0,
6930 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL);
6931 if (!btrfs_transaction_cachep)
6934 btrfs_path_cachep = kmem_cache_create("btrfs_path_cache",
6935 sizeof(struct btrfs_path), 0,
6936 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL);
6937 if (!btrfs_path_cachep)
6940 btrfs_free_space_cachep = kmem_cache_create("btrfs_free_space_cache",
6941 sizeof(struct btrfs_free_space), 0,
6942 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL);
6943 if (!btrfs_free_space_cachep)
6948 btrfs_destroy_cachep();
6952 static int btrfs_getattr(struct vfsmount *mnt,
6953 struct dentry *dentry, struct kstat *stat)
6955 struct inode *inode = dentry->d_inode;
6956 generic_fillattr(inode, stat);
6957 stat->dev = BTRFS_I(inode)->root->anon_super.s_dev;
6958 stat->blksize = PAGE_CACHE_SIZE;
6959 stat->blocks = (inode_get_bytes(inode) +
6960 BTRFS_I(inode)->delalloc_bytes) >> 9;
6965 * If a file is moved, it will inherit the cow and compression flags of the new
6968 static void fixup_inode_flags(struct inode *dir, struct inode *inode)
6970 struct btrfs_inode *b_dir = BTRFS_I(dir);
6971 struct btrfs_inode *b_inode = BTRFS_I(inode);
6973 if (b_dir->flags & BTRFS_INODE_NODATACOW)
6974 b_inode->flags |= BTRFS_INODE_NODATACOW;
6976 b_inode->flags &= ~BTRFS_INODE_NODATACOW;
6978 if (b_dir->flags & BTRFS_INODE_COMPRESS)
6979 b_inode->flags |= BTRFS_INODE_COMPRESS;
6981 b_inode->flags &= ~BTRFS_INODE_COMPRESS;
6984 static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
6985 struct inode *new_dir, struct dentry *new_dentry)
6987 struct btrfs_trans_handle *trans;
6988 struct btrfs_root *root = BTRFS_I(old_dir)->root;
6989 struct btrfs_root *dest = BTRFS_I(new_dir)->root;
6990 struct inode *new_inode = new_dentry->d_inode;
6991 struct inode *old_inode = old_dentry->d_inode;
6992 struct timespec ctime = CURRENT_TIME;
6997 if (new_dir->i_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
7000 /* we only allow rename subvolume link between subvolumes */
7001 if (old_inode->i_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest)
7004 if (old_inode->i_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID ||
7005 (new_inode && new_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID))
7008 if (S_ISDIR(old_inode->i_mode) && new_inode &&
7009 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE)
7012 * we're using rename to replace one file with another.
7013 * and the replacement file is large. Start IO on it now so
7014 * we don't add too much work to the end of the transaction
7016 if (new_inode && S_ISREG(old_inode->i_mode) && new_inode->i_size &&
7017 old_inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT)
7018 filemap_flush(old_inode->i_mapping);
7020 /* close the racy window with snapshot create/destroy ioctl */
7021 if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
7022 down_read(&root->fs_info->subvol_sem);
7024 * We want to reserve the absolute worst case amount of items. So if
7025 * both inodes are subvols and we need to unlink them then that would
7026 * require 4 item modifications, but if they are both normal inodes it
7027 * would require 5 item modifications, so we'll assume their normal
7028 * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items
7029 * should cover the worst case number of items we'll modify.
7031 trans = btrfs_start_transaction(root, 20);
7032 if (IS_ERR(trans)) {
7033 ret = PTR_ERR(trans);
7037 btrfs_set_trans_block_group(trans, new_dir);
7040 btrfs_record_root_in_trans(trans, dest);
7042 ret = btrfs_set_inode_index(new_dir, &index);
7046 if (unlikely(old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)) {
7047 /* force full log commit if subvolume involved. */
7048 root->fs_info->last_trans_log_full_commit = trans->transid;
7050 ret = btrfs_insert_inode_ref(trans, dest,
7051 new_dentry->d_name.name,
7052 new_dentry->d_name.len,
7054 new_dir->i_ino, index);
7058 * this is an ugly little race, but the rename is required
7059 * to make sure that if we crash, the inode is either at the
7060 * old name or the new one. pinning the log transaction lets
7061 * us make sure we don't allow a log commit to come in after
7062 * we unlink the name but before we add the new name back in.
7064 btrfs_pin_log_trans(root);
7067 * make sure the inode gets flushed if it is replacing
7070 if (new_inode && new_inode->i_size &&
7071 old_inode && S_ISREG(old_inode->i_mode)) {
7072 btrfs_add_ordered_operation(trans, root, old_inode);
7075 old_dir->i_ctime = old_dir->i_mtime = ctime;
7076 new_dir->i_ctime = new_dir->i_mtime = ctime;
7077 old_inode->i_ctime = ctime;
7079 if (old_dentry->d_parent != new_dentry->d_parent)
7080 btrfs_record_unlink_dir(trans, old_dir, old_inode, 1);
7082 if (unlikely(old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)) {
7083 root_objectid = BTRFS_I(old_inode)->root->root_key.objectid;
7084 ret = btrfs_unlink_subvol(trans, root, old_dir, root_objectid,
7085 old_dentry->d_name.name,
7086 old_dentry->d_name.len);
7088 ret = __btrfs_unlink_inode(trans, root, old_dir,
7089 old_dentry->d_inode,
7090 old_dentry->d_name.name,
7091 old_dentry->d_name.len);
7093 ret = btrfs_update_inode(trans, root, old_inode);
7098 new_inode->i_ctime = CURRENT_TIME;
7099 if (unlikely(new_inode->i_ino ==
7100 BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) {
7101 root_objectid = BTRFS_I(new_inode)->location.objectid;
7102 ret = btrfs_unlink_subvol(trans, dest, new_dir,
7104 new_dentry->d_name.name,
7105 new_dentry->d_name.len);
7106 BUG_ON(new_inode->i_nlink == 0);
7108 ret = btrfs_unlink_inode(trans, dest, new_dir,
7109 new_dentry->d_inode,
7110 new_dentry->d_name.name,
7111 new_dentry->d_name.len);
7114 if (new_inode->i_nlink == 0) {
7115 ret = btrfs_orphan_add(trans, new_dentry->d_inode);
7120 fixup_inode_flags(new_dir, old_inode);
7122 ret = btrfs_add_link(trans, new_dir, old_inode,
7123 new_dentry->d_name.name,
7124 new_dentry->d_name.len, 0, index);
7127 if (old_inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) {
7128 struct dentry *parent = dget_parent(new_dentry);
7129 btrfs_log_new_name(trans, old_inode, old_dir, parent);
7131 btrfs_end_log_trans(root);
7134 btrfs_end_transaction_throttle(trans, root);
7136 if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
7137 up_read(&root->fs_info->subvol_sem);
7143 * some fairly slow code that needs optimization. This walks the list
7144 * of all the inodes with pending delalloc and forces them to disk.
7146 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput)
7148 struct list_head *head = &root->fs_info->delalloc_inodes;
7149 struct btrfs_inode *binode;
7150 struct inode *inode;
7152 if (root->fs_info->sb->s_flags & MS_RDONLY)
7155 spin_lock(&root->fs_info->delalloc_lock);
7156 while (!list_empty(head)) {
7157 binode = list_entry(head->next, struct btrfs_inode,
7159 inode = igrab(&binode->vfs_inode);
7161 list_del_init(&binode->delalloc_inodes);
7162 spin_unlock(&root->fs_info->delalloc_lock);
7164 filemap_flush(inode->i_mapping);
7166 btrfs_add_delayed_iput(inode);
7171 spin_lock(&root->fs_info->delalloc_lock);
7173 spin_unlock(&root->fs_info->delalloc_lock);
7175 /* the filemap_flush will queue IO into the worker threads, but
7176 * we have to make sure the IO is actually started and that
7177 * ordered extents get created before we return
7179 atomic_inc(&root->fs_info->async_submit_draining);
7180 while (atomic_read(&root->fs_info->nr_async_submits) ||
7181 atomic_read(&root->fs_info->async_delalloc_pages)) {
7182 wait_event(root->fs_info->async_submit_wait,
7183 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
7184 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
7186 atomic_dec(&root->fs_info->async_submit_draining);
7190 int btrfs_start_one_delalloc_inode(struct btrfs_root *root, int delay_iput,
7193 struct btrfs_inode *binode;
7194 struct inode *inode = NULL;
7196 spin_lock(&root->fs_info->delalloc_lock);
7197 while (!list_empty(&root->fs_info->delalloc_inodes)) {
7198 binode = list_entry(root->fs_info->delalloc_inodes.next,
7199 struct btrfs_inode, delalloc_inodes);
7200 inode = igrab(&binode->vfs_inode);
7202 list_move_tail(&binode->delalloc_inodes,
7203 &root->fs_info->delalloc_inodes);
7207 list_del_init(&binode->delalloc_inodes);
7208 cond_resched_lock(&root->fs_info->delalloc_lock);
7210 spin_unlock(&root->fs_info->delalloc_lock);
7214 filemap_write_and_wait(inode->i_mapping);
7216 * We have to do this because compression doesn't
7217 * actually set PG_writeback until it submits the pages
7218 * for IO, which happens in an async thread, so we could
7219 * race and not actually wait for any writeback pages
7220 * because they've not been submitted yet. Technically
7221 * this could still be the case for the ordered stuff
7222 * since the async thread may not have started to do its
7223 * work yet. If this becomes the case then we need to
7224 * figure out a way to make sure that in writepage we
7225 * wait for any async pages to be submitted before
7226 * returning so that fdatawait does what its supposed to
7229 btrfs_wait_ordered_range(inode, 0, (u64)-1);
7231 filemap_flush(inode->i_mapping);
7234 btrfs_add_delayed_iput(inode);
7242 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
7243 const char *symname)
7245 struct btrfs_trans_handle *trans;
7246 struct btrfs_root *root = BTRFS_I(dir)->root;
7247 struct btrfs_path *path;
7248 struct btrfs_key key;
7249 struct inode *inode = NULL;
7257 struct btrfs_file_extent_item *ei;
7258 struct extent_buffer *leaf;
7259 unsigned long nr = 0;
7261 name_len = strlen(symname) + 1;
7262 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
7263 return -ENAMETOOLONG;
7265 err = btrfs_find_free_objectid(NULL, root, dir->i_ino, &objectid);
7269 * 2 items for inode item and ref
7270 * 2 items for dir items
7271 * 1 item for xattr if selinux is on
7273 trans = btrfs_start_transaction(root, 5);
7275 return PTR_ERR(trans);
7277 btrfs_set_trans_block_group(trans, dir);
7279 inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
7280 dentry->d_name.len, dir->i_ino, objectid,
7281 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO,
7283 if (IS_ERR(inode)) {
7284 err = PTR_ERR(inode);
7288 err = btrfs_init_inode_security(trans, inode, dir);
7294 btrfs_set_trans_block_group(trans, inode);
7295 err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
7299 inode->i_mapping->a_ops = &btrfs_aops;
7300 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
7301 inode->i_fop = &btrfs_file_operations;
7302 inode->i_op = &btrfs_file_inode_operations;
7303 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
7305 btrfs_update_inode_block_group(trans, inode);
7306 btrfs_update_inode_block_group(trans, dir);
7310 path = btrfs_alloc_path();
7312 key.objectid = inode->i_ino;
7314 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
7315 datasize = btrfs_file_extent_calc_inline_size(name_len);
7316 err = btrfs_insert_empty_item(trans, root, path, &key,
7322 leaf = path->nodes[0];
7323 ei = btrfs_item_ptr(leaf, path->slots[0],
7324 struct btrfs_file_extent_item);
7325 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
7326 btrfs_set_file_extent_type(leaf, ei,
7327 BTRFS_FILE_EXTENT_INLINE);
7328 btrfs_set_file_extent_encryption(leaf, ei, 0);
7329 btrfs_set_file_extent_compression(leaf, ei, 0);
7330 btrfs_set_file_extent_other_encoding(leaf, ei, 0);
7331 btrfs_set_file_extent_ram_bytes(leaf, ei, name_len);
7333 ptr = btrfs_file_extent_inline_start(ei);
7334 write_extent_buffer(leaf, symname, ptr, name_len);
7335 btrfs_mark_buffer_dirty(leaf);
7336 btrfs_free_path(path);
7338 inode->i_op = &btrfs_symlink_inode_operations;
7339 inode->i_mapping->a_ops = &btrfs_symlink_aops;
7340 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
7341 inode_set_bytes(inode, name_len);
7342 btrfs_i_size_write(inode, name_len - 1);
7343 err = btrfs_update_inode(trans, root, inode);
7348 nr = trans->blocks_used;
7349 btrfs_end_transaction_throttle(trans, root);
7351 inode_dec_link_count(inode);
7354 btrfs_btree_balance_dirty(root, nr);
7358 static int __btrfs_prealloc_file_range(struct inode *inode, int mode,
7359 u64 start, u64 num_bytes, u64 min_size,
7360 loff_t actual_len, u64 *alloc_hint,
7361 struct btrfs_trans_handle *trans)
7363 struct btrfs_root *root = BTRFS_I(inode)->root;
7364 struct btrfs_key ins;
7365 u64 cur_offset = start;
7368 bool own_trans = true;
7372 while (num_bytes > 0) {
7374 trans = btrfs_start_transaction(root, 3);
7375 if (IS_ERR(trans)) {
7376 ret = PTR_ERR(trans);
7381 ret = btrfs_reserve_extent(trans, root, num_bytes, min_size,
7382 0, *alloc_hint, (u64)-1, &ins, 1);
7385 btrfs_end_transaction(trans, root);
7389 ret = insert_reserved_file_extent(trans, inode,
7390 cur_offset, ins.objectid,
7391 ins.offset, ins.offset,
7392 ins.offset, 0, 0, 0,
7393 BTRFS_FILE_EXTENT_PREALLOC);
7395 btrfs_drop_extent_cache(inode, cur_offset,
7396 cur_offset + ins.offset -1, 0);
7398 num_bytes -= ins.offset;
7399 cur_offset += ins.offset;
7400 *alloc_hint = ins.objectid + ins.offset;
7402 inode->i_ctime = CURRENT_TIME;
7403 BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC;
7404 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
7405 (actual_len > inode->i_size) &&
7406 (cur_offset > inode->i_size)) {
7407 if (cur_offset > actual_len)
7408 i_size = actual_len;
7410 i_size = cur_offset;
7411 i_size_write(inode, i_size);
7412 btrfs_ordered_update_i_size(inode, i_size, NULL);
7415 ret = btrfs_update_inode(trans, root, inode);
7419 btrfs_end_transaction(trans, root);
7424 int btrfs_prealloc_file_range(struct inode *inode, int mode,
7425 u64 start, u64 num_bytes, u64 min_size,
7426 loff_t actual_len, u64 *alloc_hint)
7428 return __btrfs_prealloc_file_range(inode, mode, start, num_bytes,
7429 min_size, actual_len, alloc_hint,
7433 int btrfs_prealloc_file_range_trans(struct inode *inode,
7434 struct btrfs_trans_handle *trans, int mode,
7435 u64 start, u64 num_bytes, u64 min_size,
7436 loff_t actual_len, u64 *alloc_hint)
7438 return __btrfs_prealloc_file_range(inode, mode, start, num_bytes,
7439 min_size, actual_len, alloc_hint, trans);
7442 static int btrfs_set_page_dirty(struct page *page)
7444 return __set_page_dirty_nobuffers(page);
7447 static int btrfs_permission(struct inode *inode, int mask, unsigned int flags)
7449 struct btrfs_root *root = BTRFS_I(inode)->root;
7451 if (btrfs_root_readonly(root) && (mask & MAY_WRITE))
7453 if ((BTRFS_I(inode)->flags & BTRFS_INODE_READONLY) && (mask & MAY_WRITE))
7455 return generic_permission(inode, mask, flags, btrfs_check_acl);
7458 static const struct inode_operations btrfs_dir_inode_operations = {
7459 .getattr = btrfs_getattr,
7460 .lookup = btrfs_lookup,
7461 .create = btrfs_create,
7462 .unlink = btrfs_unlink,
7464 .mkdir = btrfs_mkdir,
7465 .rmdir = btrfs_rmdir,
7466 .rename = btrfs_rename,
7467 .symlink = btrfs_symlink,
7468 .setattr = btrfs_setattr,
7469 .mknod = btrfs_mknod,
7470 .setxattr = btrfs_setxattr,
7471 .getxattr = btrfs_getxattr,
7472 .listxattr = btrfs_listxattr,
7473 .removexattr = btrfs_removexattr,
7474 .permission = btrfs_permission,
7476 static const struct inode_operations btrfs_dir_ro_inode_operations = {
7477 .lookup = btrfs_lookup,
7478 .permission = btrfs_permission,
7481 static const struct file_operations btrfs_dir_file_operations = {
7482 .llseek = generic_file_llseek,
7483 .read = generic_read_dir,
7484 .readdir = btrfs_real_readdir,
7485 .unlocked_ioctl = btrfs_ioctl,
7486 #ifdef CONFIG_COMPAT
7487 .compat_ioctl = btrfs_ioctl,
7489 .release = btrfs_release_file,
7490 .fsync = btrfs_sync_file,
7493 static struct extent_io_ops btrfs_extent_io_ops = {
7494 .fill_delalloc = run_delalloc_range,
7495 .submit_bio_hook = btrfs_submit_bio_hook,
7496 .merge_bio_hook = btrfs_merge_bio_hook,
7497 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
7498 .writepage_end_io_hook = btrfs_writepage_end_io_hook,
7499 .writepage_start_hook = btrfs_writepage_start_hook,
7500 .readpage_io_failed_hook = btrfs_io_failed_hook,
7501 .set_bit_hook = btrfs_set_bit_hook,
7502 .clear_bit_hook = btrfs_clear_bit_hook,
7503 .merge_extent_hook = btrfs_merge_extent_hook,
7504 .split_extent_hook = btrfs_split_extent_hook,
7508 * btrfs doesn't support the bmap operation because swapfiles
7509 * use bmap to make a mapping of extents in the file. They assume
7510 * these extents won't change over the life of the file and they
7511 * use the bmap result to do IO directly to the drive.
7513 * the btrfs bmap call would return logical addresses that aren't
7514 * suitable for IO and they also will change frequently as COW
7515 * operations happen. So, swapfile + btrfs == corruption.
7517 * For now we're avoiding this by dropping bmap.
7519 static const struct address_space_operations btrfs_aops = {
7520 .readpage = btrfs_readpage,
7521 .writepage = btrfs_writepage,
7522 .writepages = btrfs_writepages,
7523 .readpages = btrfs_readpages,
7524 .sync_page = block_sync_page,
7525 .direct_IO = btrfs_direct_IO,
7526 .invalidatepage = btrfs_invalidatepage,
7527 .releasepage = btrfs_releasepage,
7528 .set_page_dirty = btrfs_set_page_dirty,
7529 .error_remove_page = generic_error_remove_page,
7532 static const struct address_space_operations btrfs_symlink_aops = {
7533 .readpage = btrfs_readpage,
7534 .writepage = btrfs_writepage,
7535 .invalidatepage = btrfs_invalidatepage,
7536 .releasepage = btrfs_releasepage,
7539 static const struct inode_operations btrfs_file_inode_operations = {
7540 .getattr = btrfs_getattr,
7541 .setattr = btrfs_setattr,
7542 .setxattr = btrfs_setxattr,
7543 .getxattr = btrfs_getxattr,
7544 .listxattr = btrfs_listxattr,
7545 .removexattr = btrfs_removexattr,
7546 .permission = btrfs_permission,
7547 .fiemap = btrfs_fiemap,
7549 static const struct inode_operations btrfs_special_inode_operations = {
7550 .getattr = btrfs_getattr,
7551 .setattr = btrfs_setattr,
7552 .permission = btrfs_permission,
7553 .setxattr = btrfs_setxattr,
7554 .getxattr = btrfs_getxattr,
7555 .listxattr = btrfs_listxattr,
7556 .removexattr = btrfs_removexattr,
7558 static const struct inode_operations btrfs_symlink_inode_operations = {
7559 .readlink = generic_readlink,
7560 .follow_link = page_follow_link_light,
7561 .put_link = page_put_link,
7562 .getattr = btrfs_getattr,
7563 .permission = btrfs_permission,
7564 .setxattr = btrfs_setxattr,
7565 .getxattr = btrfs_getxattr,
7566 .listxattr = btrfs_listxattr,
7567 .removexattr = btrfs_removexattr,
7570 const struct dentry_operations btrfs_dentry_operations = {
7571 .d_delete = btrfs_dentry_delete,