#include "compat.h"
+/* simple helper to fault in pages and copy. This should go away
+ * and be replaced with calls into generic code.
+ */
static int noinline btrfs_copy_from_user(loff_t pos, int num_pages,
int write_bytes,
struct page **prepared_pages,
return page_fault ? -EFAULT : 0;
}
+/*
+ * unlocks pages after btrfs_file_write is done with them
+ */
static void noinline btrfs_drop_pages(struct page **pages, size_t num_pages)
{
size_t i;
for (i = 0; i < num_pages; i++) {
if (!pages[i])
break;
+ /* page checked is some magic around finding pages that
+ * have been modified without going through btrfs_set_page_dirty
+ * clear it here
+ */
ClearPageChecked(pages[i]);
unlock_page(pages[i]);
mark_page_accessed(pages[i]);
}
}
-static int noinline insert_inline_extent(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct inode *inode,
- u64 offset, size_t size,
- struct page **pages, size_t page_offset,
- int num_pages)
-{
- struct btrfs_key key;
- struct btrfs_path *path;
- struct extent_buffer *leaf;
- char *kaddr;
- unsigned long ptr;
- struct btrfs_file_extent_item *ei;
- struct page *page;
- u32 datasize;
- int err = 0;
- int ret;
- int i;
- ssize_t cur_size;
-
- path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
-
- btrfs_set_trans_block_group(trans, inode);
-
- key.objectid = inode->i_ino;
- key.offset = offset;
- btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
-
- ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
- if (ret < 0) {
- err = ret;
- goto fail;
- }
- if (ret == 1) {
- struct btrfs_key found_key;
-
- if (path->slots[0] == 0)
- goto insert;
-
- path->slots[0]--;
- leaf = path->nodes[0];
- btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
-
- if (found_key.objectid != inode->i_ino)
- goto insert;
-
- if (found_key.type != BTRFS_EXTENT_DATA_KEY)
- goto insert;
- ei = btrfs_item_ptr(leaf, path->slots[0],
- struct btrfs_file_extent_item);
-
- if (btrfs_file_extent_type(leaf, ei) !=
- BTRFS_FILE_EXTENT_INLINE) {
- goto insert;
- }
- btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
- ret = 0;
- }
- if (ret == 0) {
- u32 found_size;
- u64 found_end;
-
- leaf = path->nodes[0];
- ei = btrfs_item_ptr(leaf, path->slots[0],
- struct btrfs_file_extent_item);
-
- if (btrfs_file_extent_type(leaf, ei) !=
- BTRFS_FILE_EXTENT_INLINE) {
- err = ret;
- btrfs_print_leaf(root, leaf);
- printk("found wasn't inline offset %Lu inode %lu\n",
- offset, inode->i_ino);
- goto fail;
- }
- found_size = btrfs_file_extent_inline_len(leaf,
- btrfs_item_nr(leaf, path->slots[0]));
- found_end = key.offset + found_size;
-
- if (found_end < offset + size) {
- btrfs_release_path(root, path);
- ret = btrfs_search_slot(trans, root, &key, path,
- offset + size - found_end, 1);
- BUG_ON(ret != 0);
-
- ret = btrfs_extend_item(trans, root, path,
- offset + size - found_end);
- if (ret) {
- err = ret;
- goto fail;
- }
- leaf = path->nodes[0];
- ei = btrfs_item_ptr(leaf, path->slots[0],
- struct btrfs_file_extent_item);
- inode->i_blocks += (offset + size - found_end) >> 9;
- }
- if (found_end < offset) {
- ptr = btrfs_file_extent_inline_start(ei) + found_size;
- memset_extent_buffer(leaf, 0, ptr, offset - found_end);
- }
- } else {
-insert:
- btrfs_release_path(root, path);
- datasize = offset + size - key.offset;
- inode->i_blocks += datasize >> 9;
- datasize = btrfs_file_extent_calc_inline_size(datasize);
- ret = btrfs_insert_empty_item(trans, root, path, &key,
- datasize);
- if (ret) {
- err = ret;
- printk("got bad ret %d\n", ret);
- goto fail;
- }
- leaf = path->nodes[0];
- ei = btrfs_item_ptr(leaf, path->slots[0],
- struct btrfs_file_extent_item);
- btrfs_set_file_extent_generation(leaf, ei, trans->transid);
- btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE);
- }
- ptr = btrfs_file_extent_inline_start(ei) + offset - key.offset;
-
- cur_size = size;
- i = 0;
- while (size > 0) {
- page = pages[i];
- kaddr = kmap_atomic(page, KM_USER0);
- cur_size = min_t(size_t, PAGE_CACHE_SIZE - page_offset, size);
- write_extent_buffer(leaf, kaddr + page_offset, ptr, cur_size);
- kunmap_atomic(kaddr, KM_USER0);
- page_offset = 0;
- ptr += cur_size;
- size -= cur_size;
- if (i >= num_pages) {
- printk("i %d num_pages %d\n", i, num_pages);
- }
- i++;
- }
- btrfs_mark_buffer_dirty(leaf);
-fail:
- btrfs_free_path(path);
- return err;
-}
-
+/*
+ * after copy_from_user, pages need to be dirtied and we need to make
+ * sure holes are created between the current EOF and the start of
+ * any next extents (if required).
+ *
+ * this also makes the decision about creating an inline extent vs
+ * doing real data extents, marking pages dirty and delalloc as required.
+ */
static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct file *file,
u64 start_pos;
u64 end_of_last_block;
u64 end_pos = pos + write_bytes;
- u64 inline_size;
- int did_inline = 0;
loff_t isize = i_size_read(inode);
start_pos = pos & ~((u64)root->sectorsize - 1);
}
set_extent_uptodate(io_tree, start_pos, end_of_last_block, GFP_NOFS);
- /* FIXME...EIEIO, ENOSPC and more */
- /* insert any holes we need to create */
- if (isize < start_pos) {
- u64 last_pos_in_file;
- u64 hole_size;
- u64 mask = root->sectorsize - 1;
- last_pos_in_file = (isize + mask) & ~mask;
- hole_size = (start_pos - last_pos_in_file + mask) & ~mask;
- if (hole_size > 0) {
- btrfs_wait_ordered_range(inode, last_pos_in_file,
- last_pos_in_file + hole_size);
- mutex_lock(&BTRFS_I(inode)->extent_mutex);
- err = btrfs_drop_extents(trans, root, inode,
- last_pos_in_file,
- last_pos_in_file + hole_size,
- last_pos_in_file,
- &hint_byte);
- if (err)
- goto failed;
-
- err = btrfs_insert_file_extent(trans, root,
- inode->i_ino,
- last_pos_in_file,
- 0, 0, hole_size, 0);
- btrfs_drop_extent_cache(inode, last_pos_in_file,
- last_pos_in_file + hole_size - 1, 0);
- mutex_unlock(&BTRFS_I(inode)->extent_mutex);
- btrfs_check_file(root, inode);
- }
- if (err)
- goto failed;
- }
-
- /*
- * either allocate an extent for the new bytes or setup the key
- * to show we are doing inline data in the extent
+ /* check for reserved extents on each page, we don't want
+ * to reset the delalloc bit on things that already have
+ * extents reserved.
*/
- inline_size = end_pos;
- if (isize >= BTRFS_MAX_INLINE_DATA_SIZE(root) ||
- inline_size > root->fs_info->max_inline ||
- (inline_size & (root->sectorsize -1)) == 0 ||
- inline_size >= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
- /* check for reserved extents on each page, we don't want
- * to reset the delalloc bit on things that already have
- * extents reserved.
- */
- btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block);
- for (i = 0; i < num_pages; i++) {
- struct page *p = pages[i];
- SetPageUptodate(p);
- ClearPageChecked(p);
- set_page_dirty(p);
- }
- } else {
- u64 aligned_end;
- /* step one, delete the existing extents in this range */
- aligned_end = (pos + write_bytes + root->sectorsize - 1) &
- ~((u64)root->sectorsize - 1);
- mutex_lock(&BTRFS_I(inode)->extent_mutex);
- err = btrfs_drop_extents(trans, root, inode, start_pos,
- aligned_end, aligned_end, &hint_byte);
- if (err)
- goto failed;
- if (isize > inline_size)
- inline_size = min_t(u64, isize, aligned_end);
- inline_size -= start_pos;
- err = insert_inline_extent(trans, root, inode, start_pos,
- inline_size, pages, 0, num_pages);
- btrfs_drop_extent_cache(inode, start_pos, aligned_end - 1, 0);
- BUG_ON(err);
- mutex_unlock(&BTRFS_I(inode)->extent_mutex);
-
- /*
- * an ugly way to do all the prop accounting around
- * the page bits and mapping tags
- */
- set_page_writeback(pages[0]);
- end_page_writeback(pages[0]);
- did_inline = 1;
+ btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block);
+ for (i = 0; i < num_pages; i++) {
+ struct page *p = pages[i];
+ SetPageUptodate(p);
+ ClearPageChecked(p);
+ set_page_dirty(p);
}
if (end_pos > isize) {
i_size_write(inode, end_pos);
- if (did_inline)
- BTRFS_I(inode)->disk_i_size = end_pos;
btrfs_update_inode(trans, root, inode);
}
-failed:
err = btrfs_end_transaction(trans, root);
out_unlock:
unlock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
return err;
}
+/*
+ * this drops all the extents in the cache that intersect the range
+ * [start, end]. Existing extents are split as required.
+ */
int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
int skip_pinned)
{
int ret;
int testend = 1;
unsigned long flags;
+ int compressed = 0;
WARN_ON(end < start);
if (end == (u64)-1) {
free_extent_map(em);
continue;
}
+ compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
clear_bit(EXTENT_FLAG_PINNED, &em->flags);
remove_extent_mapping(em_tree, em);
split->start = em->start;
split->len = start - em->start;
split->block_start = em->block_start;
+
+ if (compressed)
+ split->block_len = em->block_len;
+ else
+ split->block_len = split->len;
+
split->bdev = em->bdev;
split->flags = flags;
ret = add_extent_mapping(em_tree, split);
split->bdev = em->bdev;
split->flags = flags;
- split->block_start = em->block_start + diff;
+ if (compressed) {
+ split->block_len = em->block_len;
+ split->block_start = em->block_start;
+ } else {
+ split->block_len = split->len;
+ split->block_start = em->block_start + diff;
+ }
ret = add_extent_mapping(em_tree, split);
BUG_ON(ret);
struct btrfs_item *item;
item = btrfs_item_nr(leaf, slot);
extent_end = found_key.offset +
- btrfs_file_extent_inline_len(leaf, item);
+ btrfs_file_extent_inline_len(leaf, extent);
extent_end = (extent_end + root->sectorsize - 1) &
~((u64)root->sectorsize -1 );
}
* If an extent intersects the range but is not entirely inside the range
* it is either truncated or split. Anything entirely inside the range
* is deleted from the tree.
+ *
+ * inline_limit is used to tell this code which offsets in the file to keep
+ * if they contain inline extents.
*/
int noinline btrfs_drop_extents(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct inode *inode,
u64 start, u64 end, u64 inline_limit, u64 *hint_byte)
{
u64 extent_end = 0;
+ u64 locked_end = end;
u64 search_start = start;
u64 leaf_start;
+ u64 ram_bytes = 0;
+ u8 compression = 0;
+ u8 encryption = 0;
+ u16 other_encoding = 0;
u64 root_gen;
u64 root_owner;
struct extent_buffer *leaf;
int keep;
int slot;
int bookend;
- int found_type;
+ int found_type = 0;
int found_extent;
int found_inline;
int recow;
int ret;
+ inline_limit = 0;
btrfs_drop_extent_cache(inode, start, end - 1, 0);
path = btrfs_alloc_path();
extent = btrfs_item_ptr(leaf, slot,
struct btrfs_file_extent_item);
found_type = btrfs_file_extent_type(leaf, extent);
- if (found_type == BTRFS_FILE_EXTENT_REG) {
+ compression = btrfs_file_extent_compression(leaf,
+ extent);
+ encryption = btrfs_file_extent_encryption(leaf,
+ extent);
+ other_encoding = btrfs_file_extent_other_encoding(leaf,
+ extent);
+ if (found_type == BTRFS_FILE_EXTENT_REG ||
+ found_type == BTRFS_FILE_EXTENT_PREALLOC) {
extent_end =
btrfs_file_extent_disk_bytenr(leaf,
extent);
extent_end = key.offset +
btrfs_file_extent_num_bytes(leaf, extent);
+ ram_bytes = btrfs_file_extent_ram_bytes(leaf,
+ extent);
found_extent = 1;
} else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
- struct btrfs_item *item;
- item = btrfs_item_nr(leaf, slot);
found_inline = 1;
extent_end = key.offset +
- btrfs_file_extent_inline_len(leaf, item);
+ btrfs_file_extent_inline_len(leaf, extent);
}
} else {
extent_end = search_start;
goto next_slot;
}
- if (found_inline) {
- u64 mask = root->sectorsize - 1;
- search_start = (extent_end + mask) & ~mask;
- } else
- search_start = extent_end;
- if (end <= extent_end && start >= key.offset && found_inline) {
+ if (end <= extent_end && start >= key.offset && found_inline)
*hint_byte = EXTENT_MAP_INLINE;
- goto out;
- }
if (found_extent) {
read_extent_buffer(leaf, &old, (unsigned long)extent,
if (found_inline && start <= key.offset)
keep = 1;
}
+
+ if (bookend && found_extent && locked_end < extent_end) {
+ ret = try_lock_extent(&BTRFS_I(inode)->io_tree,
+ locked_end, extent_end - 1, GFP_NOFS);
+ if (!ret) {
+ btrfs_release_path(root, path);
+ lock_extent(&BTRFS_I(inode)->io_tree,
+ locked_end, extent_end - 1, GFP_NOFS);
+ locked_end = extent_end;
+ continue;
+ }
+ locked_end = extent_end;
+ }
+
+ if (found_inline) {
+ u64 mask = root->sectorsize - 1;
+ search_start = (extent_end + mask) & ~mask;
+ } else
+ search_start = extent_end;
+
/* truncate existing extent */
if (start > key.offset) {
u64 new_num;
extent);
if (btrfs_file_extent_disk_bytenr(leaf,
extent)) {
- dec_i_blocks(inode, old_num - new_num);
+ inode_sub_bytes(inode, old_num -
+ new_num);
}
btrfs_set_file_extent_num_bytes(leaf, extent,
new_num);
u32 new_size;
new_size = btrfs_file_extent_calc_inline_size(
inline_limit - key.offset);
- dec_i_blocks(inode, (extent_end - key.offset) -
- (inline_limit - key.offset));
+ inode_sub_bytes(inode, extent_end -
+ inline_limit);
btrfs_truncate_item(trans, root, path,
new_size, 1);
}
}
/* delete the entire extent */
if (!keep) {
+ if (found_inline)
+ inode_sub_bytes(inode, extent_end -
+ key.offset);
ret = btrfs_del_item(trans, root, path);
/* TODO update progress marker and return */
BUG_ON(ret);
u32 new_size;
new_size = btrfs_file_extent_calc_inline_size(
extent_end - end);
- dec_i_blocks(inode, (extent_end - key.offset) -
- (extent_end - end));
+ inode_sub_bytes(inode, end - key.offset);
ret = btrfs_truncate_item(trans, root, path,
new_size, 0);
BUG_ON(ret);
write_extent_buffer(leaf, &old,
(unsigned long)extent, sizeof(old));
+ btrfs_set_file_extent_compression(leaf, extent,
+ compression);
+ btrfs_set_file_extent_encryption(leaf, extent,
+ encryption);
+ btrfs_set_file_extent_other_encoding(leaf, extent,
+ other_encoding);
btrfs_set_file_extent_offset(leaf, extent,
le64_to_cpu(old.offset) + end - key.offset);
WARN_ON(le64_to_cpu(old.num_bytes) <
(extent_end - end));
btrfs_set_file_extent_num_bytes(leaf, extent,
extent_end - end);
- btrfs_set_file_extent_type(leaf, extent,
- BTRFS_FILE_EXTENT_REG);
+
+ /*
+ * set the ram bytes to the size of the full extent
+ * before splitting. This is a worst case flag,
+ * but its the best we can do because we don't know
+ * how splitting affects compression
+ */
+ btrfs_set_file_extent_ram_bytes(leaf, extent,
+ ram_bytes);
+ btrfs_set_file_extent_type(leaf, extent, found_type);
btrfs_mark_buffer_dirty(path->nodes[0]);
le64_to_cpu(old.disk_num_bytes),
leaf->start,
root->root_key.objectid,
- trans->transid,
- ins.objectid, ins.offset);
+ trans->transid, ins.objectid);
BUG_ON(ret);
}
btrfs_release_path(root, path);
if (disk_bytenr != 0) {
- inode->i_blocks +=
- btrfs_file_extent_num_bytes(leaf,
- extent) >> 9;
+ inode_add_bytes(inode, extent_end - end);
}
}
u64 disk_bytenr = le64_to_cpu(old.disk_bytenr);
if (disk_bytenr != 0) {
- dec_i_blocks(inode, le64_to_cpu(old.num_bytes));
+ inode_sub_bytes(inode,
+ le64_to_cpu(old.num_bytes));
ret = btrfs_free_extent(trans, root,
disk_bytenr,
le64_to_cpu(old.disk_num_bytes),
leaf_start, root_owner,
- root_gen, key.objectid,
- key.offset, 0);
+ root_gen, key.objectid, 0);
BUG_ON(ret);
*hint_byte = disk_bytenr;
}
}
out:
btrfs_free_path(path);
+ if (locked_end > end) {
+ unlock_extent(&BTRFS_I(inode)->io_tree, end, locked_end - 1,
+ GFP_NOFS);
+ }
btrfs_check_file(root, inode);
return ret;
}
+static int extent_mergeable(struct extent_buffer *leaf, int slot,
+ u64 objectid, u64 bytenr, u64 *start, u64 *end)
+{
+ struct btrfs_file_extent_item *fi;
+ struct btrfs_key key;
+ u64 extent_end;
+
+ if (slot < 0 || slot >= btrfs_header_nritems(leaf))
+ return 0;
+
+ btrfs_item_key_to_cpu(leaf, &key, slot);
+ if (key.objectid != objectid || key.type != BTRFS_EXTENT_DATA_KEY)
+ return 0;
+
+ fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG ||
+ btrfs_file_extent_disk_bytenr(leaf, fi) != bytenr ||
+ btrfs_file_extent_compression(leaf, fi) ||
+ btrfs_file_extent_encryption(leaf, fi) ||
+ btrfs_file_extent_other_encoding(leaf, fi))
+ return 0;
+
+ extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
+ if ((*start && *start != key.offset) || (*end && *end != extent_end))
+ return 0;
+
+ *start = key.offset;
+ *end = extent_end;
+ return 1;
+}
+
+/*
+ * Mark extent in the range start - end as written.
+ *
+ * This changes extent type from 'pre-allocated' to 'regular'. If only
+ * part of extent is marked as written, the extent will be split into
+ * two or three.
+ */
+int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct inode *inode, u64 start, u64 end)
+{
+ struct extent_buffer *leaf;
+ struct btrfs_path *path;
+ struct btrfs_file_extent_item *fi;
+ struct btrfs_key key;
+ u64 bytenr;
+ u64 num_bytes;
+ u64 extent_end;
+ u64 extent_offset;
+ u64 other_start;
+ u64 other_end;
+ u64 split = start;
+ u64 locked_end = end;
+ int extent_type;
+ int split_end = 1;
+ int ret;
+
+ btrfs_drop_extent_cache(inode, start, end - 1, 0);
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+again:
+ key.objectid = inode->i_ino;
+ key.type = BTRFS_EXTENT_DATA_KEY;
+ if (split == start)
+ key.offset = split;
+ else
+ key.offset = split - 1;
+
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret > 0 && path->slots[0] > 0)
+ path->slots[0]--;
+
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+ BUG_ON(key.objectid != inode->i_ino ||
+ key.type != BTRFS_EXTENT_DATA_KEY);
+ fi = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_file_extent_item);
+ extent_type = btrfs_file_extent_type(leaf, fi);
+ BUG_ON(extent_type != BTRFS_FILE_EXTENT_PREALLOC);
+ extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
+ BUG_ON(key.offset > start || extent_end < end);
+
+ bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
+ num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
+ extent_offset = btrfs_file_extent_offset(leaf, fi);
+
+ if (key.offset == start)
+ split = end;
+
+ if (key.offset == start && extent_end == end) {
+ int del_nr = 0;
+ int del_slot = 0;
+ u64 leaf_owner = btrfs_header_owner(leaf);
+ u64 leaf_gen = btrfs_header_generation(leaf);
+ other_start = end;
+ other_end = 0;
+ if (extent_mergeable(leaf, path->slots[0] + 1, inode->i_ino,
+ bytenr, &other_start, &other_end)) {
+ extent_end = other_end;
+ del_slot = path->slots[0] + 1;
+ del_nr++;
+ ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
+ leaf->start, leaf_owner,
+ leaf_gen, inode->i_ino, 0);
+ BUG_ON(ret);
+ }
+ other_start = 0;
+ other_end = start;
+ if (extent_mergeable(leaf, path->slots[0] - 1, inode->i_ino,
+ bytenr, &other_start, &other_end)) {
+ key.offset = other_start;
+ del_slot = path->slots[0];
+ del_nr++;
+ ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
+ leaf->start, leaf_owner,
+ leaf_gen, inode->i_ino, 0);
+ BUG_ON(ret);
+ }
+ split_end = 0;
+ if (del_nr == 0) {
+ btrfs_set_file_extent_type(leaf, fi,
+ BTRFS_FILE_EXTENT_REG);
+ goto done;
+ }
+
+ fi = btrfs_item_ptr(leaf, del_slot - 1,
+ struct btrfs_file_extent_item);
+ btrfs_set_file_extent_type(leaf, fi, BTRFS_FILE_EXTENT_REG);
+ btrfs_set_file_extent_num_bytes(leaf, fi,
+ extent_end - key.offset);
+ btrfs_mark_buffer_dirty(leaf);
+
+ ret = btrfs_del_items(trans, root, path, del_slot, del_nr);
+ BUG_ON(ret);
+ goto done;
+ } else if (split == start) {
+ if (locked_end < extent_end) {
+ ret = try_lock_extent(&BTRFS_I(inode)->io_tree,
+ locked_end, extent_end - 1, GFP_NOFS);
+ if (!ret) {
+ btrfs_release_path(root, path);
+ lock_extent(&BTRFS_I(inode)->io_tree,
+ locked_end, extent_end - 1, GFP_NOFS);
+ locked_end = extent_end;
+ goto again;
+ }
+ locked_end = extent_end;
+ }
+ btrfs_set_file_extent_num_bytes(leaf, fi, split - key.offset);
+ extent_offset += split - key.offset;
+ } else {
+ BUG_ON(key.offset != start);
+ btrfs_set_file_extent_offset(leaf, fi, extent_offset +
+ split - key.offset);
+ btrfs_set_file_extent_num_bytes(leaf, fi, extent_end - split);
+ key.offset = split;
+ btrfs_set_item_key_safe(trans, root, path, &key);
+ extent_end = split;
+ }
+
+ if (extent_end == end) {
+ split_end = 0;
+ extent_type = BTRFS_FILE_EXTENT_REG;
+ }
+ if (extent_end == end && split == start) {
+ other_start = end;
+ other_end = 0;
+ if (extent_mergeable(leaf, path->slots[0] + 1, inode->i_ino,
+ bytenr, &other_start, &other_end)) {
+ path->slots[0]++;
+ fi = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_file_extent_item);
+ key.offset = split;
+ btrfs_set_item_key_safe(trans, root, path, &key);
+ btrfs_set_file_extent_offset(leaf, fi, extent_offset);
+ btrfs_set_file_extent_num_bytes(leaf, fi,
+ other_end - split);
+ goto done;
+ }
+ }
+ if (extent_end == end && split == end) {
+ other_start = 0;
+ other_end = start;
+ if (extent_mergeable(leaf, path->slots[0] - 1 , inode->i_ino,
+ bytenr, &other_start, &other_end)) {
+ path->slots[0]--;
+ fi = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_file_extent_item);
+ btrfs_set_file_extent_num_bytes(leaf, fi, extent_end -
+ other_start);
+ goto done;
+ }
+ }
+
+ btrfs_mark_buffer_dirty(leaf);
+ btrfs_release_path(root, path);
+
+ key.offset = start;
+ ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*fi));
+ BUG_ON(ret);
+
+ leaf = path->nodes[0];
+ fi = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_file_extent_item);
+ btrfs_set_file_extent_generation(leaf, fi, trans->transid);
+ btrfs_set_file_extent_type(leaf, fi, extent_type);
+ btrfs_set_file_extent_disk_bytenr(leaf, fi, bytenr);
+ btrfs_set_file_extent_disk_num_bytes(leaf, fi, num_bytes);
+ btrfs_set_file_extent_offset(leaf, fi, extent_offset);
+ btrfs_set_file_extent_num_bytes(leaf, fi, extent_end - key.offset);
+ btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes);
+ btrfs_set_file_extent_compression(leaf, fi, 0);
+ btrfs_set_file_extent_encryption(leaf, fi, 0);
+ btrfs_set_file_extent_other_encoding(leaf, fi, 0);
+
+ ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes,
+ leaf->start, root->root_key.objectid,
+ trans->transid, inode->i_ino);
+ BUG_ON(ret);
+done:
+ btrfs_mark_buffer_dirty(leaf);
+ btrfs_release_path(root, path);
+ if (split_end && split == start) {
+ split = end;
+ goto again;
+ }
+ if (locked_end > end) {
+ unlock_extent(&BTRFS_I(inode)->io_tree, end, locked_end - 1,
+ GFP_NOFS);
+ }
+ btrfs_free_path(path);
+ return 0;
+}
+
/*
- * this gets pages into the page cache and locks them down
+ * this gets pages into the page cache and locks them down, it also properly
+ * waits for data=ordered extents to finish before allowing the pages to be
+ * modified.
*/
static int noinline prepare_pages(struct btrfs_root *root, struct file *file,
struct page **pages, size_t num_pages,
start_pos = pos & ~((u64)root->sectorsize - 1);
last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT;
+ if (start_pos > inode->i_size) {
+ err = btrfs_cont_expand(inode, start_pos);
+ if (err)
+ return err;
+ }
+
memset(pages, 0, num_pages * sizeof(struct page *));
again:
for (i = 0; i < num_pages; i++) {
struct page *pinned[2];
unsigned long first_index;
unsigned long last_index;
+ int will_write;
+
+ will_write = ((file->f_flags & O_SYNC) || IS_SYNC(inode) ||
+ (file->f_flags & O_DIRECT));
nrptrs = min((count + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE,
PAGE_CACHE_SIZE / (sizeof(struct page *)));
if (ret)
goto out;
+ if (will_write) {
+ btrfs_fdatawrite_range(inode->i_mapping, pos,
+ pos + write_bytes - 1,
+ WB_SYNC_NONE);
+ } else {
+ balance_dirty_pages_ratelimited_nr(inode->i_mapping,
+ num_pages);
+ if (num_pages <
+ (root->leafsize >> PAGE_CACHE_SHIFT) + 1)
+ btrfs_btree_balance_dirty(root, 1);
+ btrfs_throttle(root);
+ }
+
buf += write_bytes;
count -= write_bytes;
pos += write_bytes;
num_written += write_bytes;
- balance_dirty_pages_ratelimited_nr(inode->i_mapping, num_pages);
- if (num_pages < (root->leafsize >> PAGE_CACHE_SHIFT) + 1)
- btrfs_btree_balance_dirty(root, 1);
- btrfs_throttle(root);
cond_resched();
}
out:
page_cache_release(pinned[1]);
*ppos = pos;
- if (num_written > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
+ if (num_written > 0 && will_write) {
struct btrfs_trans_handle *trans;
- err = btrfs_fdatawrite_range(inode->i_mapping, start_pos,
- start_pos + num_written -1,
- WB_SYNC_NONE);
- if (err < 0)
- num_written = err;
-
- err = btrfs_wait_on_page_writeback_range(inode->i_mapping,
- start_pos, start_pos + num_written - 1);
- if (err < 0)
+ err = btrfs_wait_ordered_range(inode, start_pos, num_written);
+ if (err)
num_written = err;
- trans = btrfs_start_transaction(root, 1);
- ret = btrfs_log_dentry_safe(trans, root, file->f_dentry);
- if (ret == 0) {
- btrfs_sync_log(trans, root);
- btrfs_end_transaction(trans, root);
- } else {
- btrfs_commit_transaction(trans, root);
+ if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) {
+ trans = btrfs_start_transaction(root, 1);
+ ret = btrfs_log_dentry_safe(trans, root,
+ file->f_dentry);
+ if (ret == 0) {
+ btrfs_sync_log(trans, root);
+ btrfs_end_transaction(trans, root);
+ } else {
+ btrfs_commit_transaction(trans, root);
+ }
+ }
+ if (file->f_flags & O_DIRECT) {
+ invalidate_mapping_pages(inode->i_mapping,
+ start_pos >> PAGE_CACHE_SHIFT,
+ (start_pos + num_written - 1) >> PAGE_CACHE_SHIFT);
}
- } else if (num_written > 0 && (file->f_flags & O_DIRECT)) {
- do_sync_mapping_range(inode->i_mapping, start_pos,
- start_pos + num_written - 1,
- SYNC_FILE_RANGE_WRITE |
- SYNC_FILE_RANGE_WAIT_AFTER);
- invalidate_mapping_pages(inode->i_mapping,
- start_pos >> PAGE_CACHE_SHIFT,
- (start_pos + num_written - 1) >> PAGE_CACHE_SHIFT);
}
current->backing_dev_info = NULL;
return num_written ? num_written : err;
return 0;
}
+/*
+ * fsync call for both files and directories. This logs the inode into
+ * the tree log instead of forcing full commits whenever possible.
+ *
+ * It needs to call filemap_fdatawait so that all ordered extent updates are
+ * in the metadata btree are up to date for copying to the log.
+ *
+ * It drops the inode mutex before doing the tree log commit. This is an
+ * important optimization for directories because holding the mutex prevents
+ * new operations on the dir while we write to disk.
+ */
int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
{
struct inode *inode = dentry->d_inode;
git.openpandora.org / pandora-kernel.git / blobdiff