#include <linux/xattr.h>
#include <linux/posix_acl.h>
#include <linux/falloc.h>
+#include <linux/slab.h>
#include "compat.h"
#include "ctree.h"
#include "disk-io.h"
inline_len, compressed_size,
compressed_pages);
BUG_ON(ret);
+ btrfs_delalloc_release_metadata(inode, end + 1 - start);
btrfs_drop_extent_cache(inode, start, aligned_end - 1, 0);
return 0;
}
trans = btrfs_join_transaction(root, 1);
BUG_ON(!trans);
btrfs_set_trans_block_group(trans, inode);
+ trans->block_rsv = &root->fs_info->delalloc_block_rsv;
/* lets try to make an inline extent */
if (ret || total_in < (actual_end - start)) {
start, end, NULL,
EXTENT_CLEAR_UNLOCK_PAGE | EXTENT_CLEAR_DIRTY |
EXTENT_CLEAR_DELALLOC |
- EXTENT_CLEAR_ACCOUNTING |
EXTENT_SET_WRITEBACK | EXTENT_END_WRITEBACK);
btrfs_end_transaction(trans, root);
return 0;
}
+static u64 get_extent_allocation_hint(struct inode *inode, u64 start,
+ u64 num_bytes)
+{
+ struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
+ struct extent_map *em;
+ u64 alloc_hint = 0;
+
+ read_lock(&em_tree->lock);
+ em = search_extent_mapping(em_tree, start, num_bytes);
+ if (em) {
+ /*
+ * if block start isn't an actual block number then find the
+ * first block in this inode and use that as a hint. If that
+ * block is also bogus then just don't worry about it.
+ */
+ if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
+ free_extent_map(em);
+ em = search_extent_mapping(em_tree, 0, 0);
+ if (em && em->block_start < EXTENT_MAP_LAST_BYTE)
+ alloc_hint = em->block_start;
+ if (em)
+ free_extent_map(em);
+ } else {
+ alloc_hint = em->block_start;
+ free_extent_map(em);
+ }
+ }
+ read_unlock(&em_tree->lock);
+
+ return alloc_hint;
+}
+
/*
* when extent_io.c finds a delayed allocation range in the file,
* the call backs end up in this code. The basic idea is to
trans = btrfs_join_transaction(root, 1);
BUG_ON(!trans);
btrfs_set_trans_block_group(trans, inode);
+ trans->block_rsv = &root->fs_info->delalloc_block_rsv;
actual_end = min_t(u64, isize, end + 1);
EXTENT_CLEAR_UNLOCK_PAGE |
EXTENT_CLEAR_UNLOCK |
EXTENT_CLEAR_DELALLOC |
- EXTENT_CLEAR_ACCOUNTING |
EXTENT_CLEAR_DIRTY |
EXTENT_SET_WRITEBACK |
EXTENT_END_WRITEBACK);
BUG_ON(disk_num_bytes >
btrfs_super_total_bytes(&root->fs_info->super_copy));
-
- read_lock(&BTRFS_I(inode)->extent_tree.lock);
- em = search_extent_mapping(&BTRFS_I(inode)->extent_tree,
- start, num_bytes);
- if (em) {
- /*
- * if block start isn't an actual block number then find the
- * first block in this inode and use that as a hint. If that
- * block is also bogus then just don't worry about it.
- */
- if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
- free_extent_map(em);
- em = search_extent_mapping(em_tree, 0, 0);
- if (em && em->block_start < EXTENT_MAP_LAST_BYTE)
- alloc_hint = em->block_start;
- if (em)
- free_extent_map(em);
- } else {
- alloc_hint = em->block_start;
- free_extent_map(em);
- }
- }
- read_unlock(&BTRFS_I(inode)->extent_tree.lock);
+ alloc_hint = get_extent_allocation_hint(inode, start, num_bytes);
btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0);
while (disk_num_bytes > 0) {
unsigned long op;
- cur_alloc_size = min(disk_num_bytes, root->fs_info->max_extent);
+ cur_alloc_size = disk_num_bytes;
ret = btrfs_reserve_extent(trans, root, cur_alloc_size,
root->sectorsize, 0, alloc_hint,
(u64)-1, &ins, 1);
num_bytes, num_bytes, type);
BUG_ON(ret);
+ if (root->root_key.objectid ==
+ BTRFS_DATA_RELOC_TREE_OBJECTID) {
+ ret = btrfs_reloc_clone_csums(inode, cur_offset,
+ num_bytes);
+ BUG_ON(ret);
+ }
+
extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree,
cur_offset, cur_offset + num_bytes - 1,
locked_page, EXTENT_CLEAR_UNLOCK_PAGE |
}
static int btrfs_split_extent_hook(struct inode *inode,
- struct extent_state *orig, u64 split)
+ struct extent_state *orig, u64 split)
{
- struct btrfs_root *root = BTRFS_I(inode)->root;
- u64 size;
-
+ /* not delalloc, ignore it */
if (!(orig->state & EXTENT_DELALLOC))
return 0;
- size = orig->end - orig->start + 1;
- if (size > root->fs_info->max_extent) {
- u64 num_extents;
- u64 new_size;
-
- new_size = orig->end - split + 1;
- num_extents = div64_u64(size + root->fs_info->max_extent - 1,
- root->fs_info->max_extent);
-
- /*
- * if we break a large extent up then leave oustanding_extents
- * be, since we've already accounted for the large extent.
- */
- if (div64_u64(new_size + root->fs_info->max_extent - 1,
- root->fs_info->max_extent) < num_extents)
- return 0;
- }
-
- spin_lock(&BTRFS_I(inode)->accounting_lock);
- BTRFS_I(inode)->outstanding_extents++;
- spin_unlock(&BTRFS_I(inode)->accounting_lock);
-
+ atomic_inc(&BTRFS_I(inode)->outstanding_extents);
return 0;
}
struct extent_state *new,
struct extent_state *other)
{
- struct btrfs_root *root = BTRFS_I(inode)->root;
- u64 new_size, old_size;
- u64 num_extents;
-
/* not delalloc, ignore it */
if (!(other->state & EXTENT_DELALLOC))
return 0;
- old_size = other->end - other->start + 1;
- if (new->start < other->start)
- new_size = other->end - new->start + 1;
- else
- new_size = new->end - other->start + 1;
-
- /* we're not bigger than the max, unreserve the space and go */
- if (new_size <= root->fs_info->max_extent) {
- spin_lock(&BTRFS_I(inode)->accounting_lock);
- BTRFS_I(inode)->outstanding_extents--;
- spin_unlock(&BTRFS_I(inode)->accounting_lock);
- return 0;
- }
-
- /*
- * If we grew by another max_extent, just return, we want to keep that
- * reserved amount.
- */
- num_extents = div64_u64(old_size + root->fs_info->max_extent - 1,
- root->fs_info->max_extent);
- if (div64_u64(new_size + root->fs_info->max_extent - 1,
- root->fs_info->max_extent) > num_extents)
- return 0;
-
- spin_lock(&BTRFS_I(inode)->accounting_lock);
- BTRFS_I(inode)->outstanding_extents--;
- spin_unlock(&BTRFS_I(inode)->accounting_lock);
-
+ atomic_dec(&BTRFS_I(inode)->outstanding_extents);
return 0;
}
* bytes in this file, and to maintain the list of inodes that
* have pending delalloc work to be done.
*/
-static int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
- unsigned long old, unsigned long bits)
+static int btrfs_set_bit_hook(struct inode *inode,
+ struct extent_state *state, int *bits)
{
/*
* but in this case, we are only testeing for the DELALLOC
* bit, which is only set or cleared with irqs on
*/
- if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
+ if (!(state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) {
struct btrfs_root *root = BTRFS_I(inode)->root;
+ u64 len = state->end + 1 - state->start;
+
+ if (*bits & EXTENT_FIRST_DELALLOC)
+ *bits &= ~EXTENT_FIRST_DELALLOC;
+ else
+ atomic_inc(&BTRFS_I(inode)->outstanding_extents);
- spin_lock(&BTRFS_I(inode)->accounting_lock);
- BTRFS_I(inode)->outstanding_extents++;
- spin_unlock(&BTRFS_I(inode)->accounting_lock);
- btrfs_delalloc_reserve_space(root, inode, end - start + 1);
spin_lock(&root->fs_info->delalloc_lock);
- BTRFS_I(inode)->delalloc_bytes += end - start + 1;
- root->fs_info->delalloc_bytes += end - start + 1;
+ BTRFS_I(inode)->delalloc_bytes += len;
+ root->fs_info->delalloc_bytes += len;
if (list_empty(&BTRFS_I(inode)->delalloc_inodes)) {
list_add_tail(&BTRFS_I(inode)->delalloc_inodes,
&root->fs_info->delalloc_inodes);
* extent_io.c clear_bit_hook, see set_bit_hook for why
*/
static int btrfs_clear_bit_hook(struct inode *inode,
- struct extent_state *state, unsigned long bits)
+ struct extent_state *state, int *bits)
{
/*
* set_bit and clear bit hooks normally require _irqsave/restore
* but in this case, we are only testeing for the DELALLOC
* bit, which is only set or cleared with irqs on
*/
- if ((state->state & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
+ if ((state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) {
struct btrfs_root *root = BTRFS_I(inode)->root;
+ u64 len = state->end + 1 - state->start;
- if (bits & EXTENT_DO_ACCOUNTING) {
- spin_lock(&BTRFS_I(inode)->accounting_lock);
- BTRFS_I(inode)->outstanding_extents--;
- spin_unlock(&BTRFS_I(inode)->accounting_lock);
- btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
- }
+ if (*bits & EXTENT_FIRST_DELALLOC)
+ *bits &= ~EXTENT_FIRST_DELALLOC;
+ else if (!(*bits & EXTENT_DO_ACCOUNTING))
+ atomic_dec(&BTRFS_I(inode)->outstanding_extents);
+
+ if (*bits & EXTENT_DO_ACCOUNTING)
+ btrfs_delalloc_release_metadata(inode, len);
+
+ if (root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID)
+ btrfs_free_reserved_data_space(inode, len);
spin_lock(&root->fs_info->delalloc_lock);
- if (state->end - state->start + 1 >
- root->fs_info->delalloc_bytes) {
- printk(KERN_INFO "btrfs warning: delalloc account "
- "%llu %llu\n",
- (unsigned long long)
- state->end - state->start + 1,
- (unsigned long long)
- root->fs_info->delalloc_bytes);
- btrfs_delalloc_free_space(root, inode, (u64)-1);
- root->fs_info->delalloc_bytes = 0;
- BTRFS_I(inode)->delalloc_bytes = 0;
- } else {
- btrfs_delalloc_free_space(root, inode,
- state->end -
- state->start + 1);
- root->fs_info->delalloc_bytes -= state->end -
- state->start + 1;
- BTRFS_I(inode)->delalloc_bytes -= state->end -
- state->start + 1;
- }
+ root->fs_info->delalloc_bytes -= len;
+ BTRFS_I(inode)->delalloc_bytes -= len;
+
if (BTRFS_I(inode)->delalloc_bytes == 0 &&
!list_empty(&BTRFS_I(inode)->delalloc_inodes)) {
list_del_init(&BTRFS_I(inode)->delalloc_inodes);
*/
static int __btrfs_submit_bio_start(struct inode *inode, int rw,
struct bio *bio, int mirror_num,
- unsigned long bio_flags)
+ unsigned long bio_flags,
+ u64 bio_offset)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
int ret = 0;
* are inserted into the btree
*/
static int __btrfs_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
- int mirror_num, unsigned long bio_flags)
+ int mirror_num, unsigned long bio_flags,
+ u64 bio_offset)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
return btrfs_map_bio(root, rw, bio, mirror_num, 1);
* on write, or reading the csums from the tree before a read
*/
static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
- int mirror_num, unsigned long bio_flags)
+ int mirror_num, unsigned long bio_flags,
+ u64 bio_offset)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
int ret = 0;
/* we're doing a write, do the async checksumming */
return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
inode, rw, bio, mirror_num,
- bio_flags, __btrfs_submit_bio_start,
+ bio_flags, bio_offset,
+ __btrfs_submit_bio_start,
__btrfs_submit_bio_done);
}
goto again;
}
+ BUG();
btrfs_set_extent_delalloc(inode, page_start, page_end, &cached_state);
ClearPageChecked(page);
out:
static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
- struct btrfs_trans_handle *trans;
+ struct btrfs_trans_handle *trans = NULL;
struct btrfs_ordered_extent *ordered_extent = NULL;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct extent_state *cached_state = NULL;
ret = btrfs_ordered_update_i_size(inode, 0, ordered_extent);
if (!ret) {
trans = btrfs_join_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
+ trans->block_rsv = &root->fs_info->delalloc_block_rsv;
ret = btrfs_update_inode(trans, root, inode);
BUG_ON(ret);
- btrfs_end_transaction(trans, root);
}
goto out;
}
0, &cached_state, GFP_NOFS);
trans = btrfs_join_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
+ trans->block_rsv = &root->fs_info->delalloc_block_rsv;
if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags))
compressed = 1;
add_pending_csums(trans, inode, ordered_extent->file_offset,
&ordered_extent->list);
- /* this also removes the ordered extent from the tree */
btrfs_ordered_update_i_size(inode, 0, ordered_extent);
ret = btrfs_update_inode(trans, root, inode);
BUG_ON(ret);
- btrfs_end_transaction(trans, root);
out:
+ btrfs_delalloc_release_metadata(inode, ordered_extent->len);
+ if (trans)
+ btrfs_end_transaction(trans, root);
/* once for us */
btrfs_put_ordered_extent(ordered_extent);
/* once for the tree */
BTRFS_I(inode)->io_tree.ops->submit_bio_hook(inode, rw, bio,
failrec->last_mirror,
- failrec->bio_flags);
+ failrec->bio_flags, 0);
return 0;
}
up_read(&root->fs_info->cleanup_work_sem);
}
+/*
+ * calculate extra metadata reservation when snapshotting a subvolume
+ * contains orphan files.
+ */
+void btrfs_orphan_pre_snapshot(struct btrfs_trans_handle *trans,
+ struct btrfs_pending_snapshot *pending,
+ u64 *bytes_to_reserve)
+{
+ struct btrfs_root *root;
+ struct btrfs_block_rsv *block_rsv;
+ u64 num_bytes;
+ int index;
+
+ root = pending->root;
+ if (!root->orphan_block_rsv || list_empty(&root->orphan_list))
+ return;
+
+ block_rsv = root->orphan_block_rsv;
+
+ /* orphan block reservation for the snapshot */
+ num_bytes = block_rsv->size;
+
+ /*
+ * after the snapshot is created, COWing tree blocks may use more
+ * space than it frees. So we should make sure there is enough
+ * reserved space.
+ */
+ index = trans->transid & 0x1;
+ if (block_rsv->reserved + block_rsv->freed[index] < block_rsv->size) {
+ num_bytes += block_rsv->size -
+ (block_rsv->reserved + block_rsv->freed[index]);
+ }
+
+ *bytes_to_reserve += num_bytes;
+}
+
+void btrfs_orphan_post_snapshot(struct btrfs_trans_handle *trans,
+ struct btrfs_pending_snapshot *pending)
+{
+ struct btrfs_root *root = pending->root;
+ struct btrfs_root *snap = pending->snap;
+ struct btrfs_block_rsv *block_rsv;
+ u64 num_bytes;
+ int index;
+ int ret;
+
+ if (!root->orphan_block_rsv || list_empty(&root->orphan_list))
+ return;
+
+ /* refill source subvolume's orphan block reservation */
+ block_rsv = root->orphan_block_rsv;
+ index = trans->transid & 0x1;
+ if (block_rsv->reserved + block_rsv->freed[index] < block_rsv->size) {
+ num_bytes = block_rsv->size -
+ (block_rsv->reserved + block_rsv->freed[index]);
+ ret = btrfs_block_rsv_migrate(&pending->block_rsv,
+ root->orphan_block_rsv,
+ num_bytes);
+ BUG_ON(ret);
+ }
+
+ /* setup orphan block reservation for the snapshot */
+ block_rsv = btrfs_alloc_block_rsv(snap);
+ BUG_ON(!block_rsv);
+
+ btrfs_add_durable_block_rsv(root->fs_info, block_rsv);
+ snap->orphan_block_rsv = block_rsv;
+
+ num_bytes = root->orphan_block_rsv->size;
+ ret = btrfs_block_rsv_migrate(&pending->block_rsv,
+ block_rsv, num_bytes);
+ BUG_ON(ret);
+
+#if 0
+ /* insert orphan item for the snapshot */
+ WARN_ON(!root->orphan_item_inserted);
+ ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root,
+ snap->root_key.objectid);
+ BUG_ON(ret);
+ snap->orphan_item_inserted = 1;
+#endif
+}
+
+enum btrfs_orphan_cleanup_state {
+ ORPHAN_CLEANUP_STARTED = 1,
+ ORPHAN_CLEANUP_DONE = 2,
+};
+
+/*
+ * This is called in transaction commmit time. If there are no orphan
+ * files in the subvolume, it removes orphan item and frees block_rsv
+ * structure.
+ */
+void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
+{
+ int ret;
+
+ if (!list_empty(&root->orphan_list) ||
+ root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE)
+ return;
+
+ if (root->orphan_item_inserted &&
+ btrfs_root_refs(&root->root_item) > 0) {
+ ret = btrfs_del_orphan_item(trans, root->fs_info->tree_root,
+ root->root_key.objectid);
+ BUG_ON(ret);
+ root->orphan_item_inserted = 0;
+ }
+
+ if (root->orphan_block_rsv) {
+ WARN_ON(root->orphan_block_rsv->size > 0);
+ btrfs_free_block_rsv(root, root->orphan_block_rsv);
+ root->orphan_block_rsv = NULL;
+ }
+}
+
/*
* This creates an orphan entry for the given inode in case something goes
* wrong in the middle of an unlink/truncate.
+ *
+ * NOTE: caller of this function should reserve 5 units of metadata for
+ * this function.
*/
int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
- int ret = 0;
+ struct btrfs_block_rsv *block_rsv = NULL;
+ int reserve = 0;
+ int insert = 0;
+ int ret;
- spin_lock(&root->list_lock);
+ if (!root->orphan_block_rsv) {
+ block_rsv = btrfs_alloc_block_rsv(root);
+ BUG_ON(!block_rsv);
+ }
- /* already on the orphan list, we're good */
- if (!list_empty(&BTRFS_I(inode)->i_orphan)) {
- spin_unlock(&root->list_lock);
- return 0;
+ spin_lock(&root->orphan_lock);
+ if (!root->orphan_block_rsv) {
+ root->orphan_block_rsv = block_rsv;
+ } else if (block_rsv) {
+ btrfs_free_block_rsv(root, block_rsv);
+ block_rsv = NULL;
}
- list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list);
+ if (list_empty(&BTRFS_I(inode)->i_orphan)) {
+ list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list);
+#if 0
+ /*
+ * For proper ENOSPC handling, we should do orphan
+ * cleanup when mounting. But this introduces backward
+ * compatibility issue.
+ */
+ if (!xchg(&root->orphan_item_inserted, 1))
+ insert = 2;
+ else
+ insert = 1;
+#endif
+ insert = 1;
+ } else {
+ WARN_ON(!BTRFS_I(inode)->orphan_meta_reserved);
+ }
- spin_unlock(&root->list_lock);
+ if (!BTRFS_I(inode)->orphan_meta_reserved) {
+ BTRFS_I(inode)->orphan_meta_reserved = 1;
+ reserve = 1;
+ }
+ spin_unlock(&root->orphan_lock);
- /*
- * insert an orphan item to track this unlinked/truncated file
- */
- ret = btrfs_insert_orphan_item(trans, root, inode->i_ino);
+ if (block_rsv)
+ btrfs_add_durable_block_rsv(root->fs_info, block_rsv);
- return ret;
+ /* grab metadata reservation from transaction handle */
+ if (reserve) {
+ ret = btrfs_orphan_reserve_metadata(trans, inode);
+ BUG_ON(ret);
+ }
+
+ /* insert an orphan item to track this unlinked/truncated file */
+ if (insert >= 1) {
+ ret = btrfs_insert_orphan_item(trans, root, inode->i_ino);
+ BUG_ON(ret);
+ }
+
+ /* insert an orphan item to track subvolume contains orphan files */
+ if (insert >= 2) {
+ ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root,
+ root->root_key.objectid);
+ BUG_ON(ret);
+ }
+ return 0;
}
/*
int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
+ int delete_item = 0;
+ int release_rsv = 0;
int ret = 0;
- spin_lock(&root->list_lock);
-
- if (list_empty(&BTRFS_I(inode)->i_orphan)) {
- spin_unlock(&root->list_lock);
- return 0;
+ spin_lock(&root->orphan_lock);
+ if (!list_empty(&BTRFS_I(inode)->i_orphan)) {
+ list_del_init(&BTRFS_I(inode)->i_orphan);
+ delete_item = 1;
}
- list_del_init(&BTRFS_I(inode)->i_orphan);
- if (!trans) {
- spin_unlock(&root->list_lock);
- return 0;
+ if (BTRFS_I(inode)->orphan_meta_reserved) {
+ BTRFS_I(inode)->orphan_meta_reserved = 0;
+ release_rsv = 1;
}
+ spin_unlock(&root->orphan_lock);
- spin_unlock(&root->list_lock);
+ if (trans && delete_item) {
+ ret = btrfs_del_orphan_item(trans, root, inode->i_ino);
+ BUG_ON(ret);
+ }
- ret = btrfs_del_orphan_item(trans, root, inode->i_ino);
+ if (release_rsv)
+ btrfs_orphan_release_metadata(inode);
- return ret;
+ return 0;
}
/*
struct inode *inode;
int ret = 0, nr_unlink = 0, nr_truncate = 0;
- if (!xchg(&root->clean_orphans, 0))
+ if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED))
return;
path = btrfs_alloc_path();
found_key.type = BTRFS_INODE_ITEM_KEY;
found_key.offset = 0;
inode = btrfs_iget(root->fs_info->sb, &found_key, root, NULL);
- if (IS_ERR(inode))
- break;
+ BUG_ON(IS_ERR(inode));
/*
* add this inode to the orphan list so btrfs_orphan_del does
* the proper thing when we hit it
*/
- spin_lock(&root->list_lock);
+ spin_lock(&root->orphan_lock);
list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list);
- spin_unlock(&root->list_lock);
+ spin_unlock(&root->orphan_lock);
/*
* if this is a bad inode, means we actually succeeded in
* do a destroy_inode
*/
if (is_bad_inode(inode)) {
- trans = btrfs_start_transaction(root, 1);
+ trans = btrfs_start_transaction(root, 0);
btrfs_orphan_del(trans, inode);
btrfs_end_transaction(trans, root);
iput(inode);
/* this will do delete_inode and everything for us */
iput(inode);
}
+ btrfs_free_path(path);
+
+ root->orphan_cleanup_state = ORPHAN_CLEANUP_DONE;
+
+ if (root->orphan_block_rsv)
+ btrfs_block_rsv_release(root, root->orphan_block_rsv,
+ (u64)-1);
+
+ if (root->orphan_block_rsv || root->orphan_item_inserted) {
+ trans = btrfs_join_transaction(root, 1);
+ btrfs_end_transaction(trans, root);
+ }
if (nr_unlink)
printk(KERN_INFO "btrfs: unlinked %d orphans\n", nr_unlink);
if (nr_truncate)
printk(KERN_INFO "btrfs: truncated %d orphans\n", nr_truncate);
-
- btrfs_free_path(path);
}
/*
return ret;
}
-static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
+/* helper to check if there is any shared block in the path */
+static int check_path_shared(struct btrfs_root *root,
+ struct btrfs_path *path)
{
- struct btrfs_root *root;
- struct btrfs_trans_handle *trans;
- struct inode *inode = dentry->d_inode;
+ struct extent_buffer *eb;
+ int level;
int ret;
- unsigned long nr = 0;
-
- root = BTRFS_I(dir)->root;
-
- /*
- * 5 items for unlink inode
- * 1 for orphan
- */
- ret = btrfs_reserve_metadata_space(root, 6);
- if (ret)
- return ret;
+ u64 refs;
- trans = btrfs_start_transaction(root, 1);
- if (IS_ERR(trans)) {
- btrfs_unreserve_metadata_space(root, 6);
- return PTR_ERR(trans);
+ for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
+ if (!path->nodes[level])
+ break;
+ eb = path->nodes[level];
+ if (!btrfs_block_can_be_shared(root, eb))
+ continue;
+ ret = btrfs_lookup_extent_info(NULL, root, eb->start, eb->len,
+ &refs, NULL);
+ if (refs > 1)
+ return 1;
}
-
- btrfs_set_trans_block_group(trans, dir);
-
- btrfs_record_unlink_dir(trans, dir, dentry->d_inode, 0);
-
- ret = btrfs_unlink_inode(trans, root, dir, dentry->d_inode,
- dentry->d_name.name, dentry->d_name.len);
-
- if (inode->i_nlink == 0)
- ret = btrfs_orphan_add(trans, inode);
-
- nr = trans->blocks_used;
-
- btrfs_end_transaction_throttle(trans, root);
- btrfs_unreserve_metadata_space(root, 6);
- btrfs_btree_balance_dirty(root, nr);
- return ret;
+ return 0;
}
-int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct inode *dir, u64 objectid,
- const char *name, int name_len)
+/*
+ * helper to start transaction for unlink and rmdir.
+ *
+ * unlink and rmdir are special in btrfs, they do not always free space.
+ * so in enospc case, we should make sure they will free space before
+ * allowing them to use the global metadata reservation.
+ */
+static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir,
+ struct dentry *dentry)
{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
struct btrfs_path *path;
- struct extent_buffer *leaf;
+ struct btrfs_inode_ref *ref;
struct btrfs_dir_item *di;
- struct btrfs_key key;
+ struct inode *inode = dentry->d_inode;
u64 index;
+ int check_link = 1;
+ int err = -ENOSPC;
int ret;
- path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
+ trans = btrfs_start_transaction(root, 10);
+ if (!IS_ERR(trans) || PTR_ERR(trans) != -ENOSPC)
+ return trans;
- di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
- name, name_len, -1);
- BUG_ON(!di || IS_ERR(di));
+ if (inode->i_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
+ return ERR_PTR(-ENOSPC);
- leaf = path->nodes[0];
- btrfs_dir_item_key_to_cpu(leaf, di, &key);
- WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid);
- ret = btrfs_delete_one_dir_name(trans, root, path, di);
- BUG_ON(ret);
- btrfs_release_path(root, path);
+ /* check if there is someone else holds reference */
+ if (S_ISDIR(inode->i_mode) && atomic_read(&inode->i_count) > 1)
+ return ERR_PTR(-ENOSPC);
- ret = btrfs_del_root_ref(trans, root->fs_info->tree_root,
- objectid, root->root_key.objectid,
- dir->i_ino, &index, name, name_len);
- if (ret < 0) {
- BUG_ON(ret != -ENOENT);
- di = btrfs_search_dir_index_item(root, path, dir->i_ino,
- name, name_len);
- BUG_ON(!di || IS_ERR(di));
+ if (atomic_read(&inode->i_count) > 2)
+ return ERR_PTR(-ENOSPC);
- leaf = path->nodes[0];
+ if (xchg(&root->fs_info->enospc_unlink, 1))
+ return ERR_PTR(-ENOSPC);
+
+ path = btrfs_alloc_path();
+ if (!path) {
+ root->fs_info->enospc_unlink = 0;
+ return ERR_PTR(-ENOMEM);
+ }
+
+ trans = btrfs_start_transaction(root, 0);
+ if (IS_ERR(trans)) {
+ btrfs_free_path(path);
+ root->fs_info->enospc_unlink = 0;
+ return trans;
+ }
+
+ path->skip_locking = 1;
+ path->search_commit_root = 1;
+
+ ret = btrfs_lookup_inode(trans, root, path,
+ &BTRFS_I(dir)->location, 0);
+ if (ret < 0) {
+ err = ret;
+ goto out;
+ }
+ if (ret == 0) {
+ if (check_path_shared(root, path))
+ goto out;
+ } else {
+ check_link = 0;
+ }
+ btrfs_release_path(root, path);
+
+ ret = btrfs_lookup_inode(trans, root, path,
+ &BTRFS_I(inode)->location, 0);
+ if (ret < 0) {
+ err = ret;
+ goto out;
+ }
+ if (ret == 0) {
+ if (check_path_shared(root, path))
+ goto out;
+ } else {
+ check_link = 0;
+ }
+ btrfs_release_path(root, path);
+
+ if (ret == 0 && S_ISREG(inode->i_mode)) {
+ ret = btrfs_lookup_file_extent(trans, root, path,
+ inode->i_ino, (u64)-1, 0);
+ if (ret < 0) {
+ err = ret;
+ goto out;
+ }
+ BUG_ON(ret == 0);
+ if (check_path_shared(root, path))
+ goto out;
+ btrfs_release_path(root, path);
+ }
+
+ if (!check_link) {
+ err = 0;
+ goto out;
+ }
+
+ di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
+ dentry->d_name.name, dentry->d_name.len, 0);
+ if (IS_ERR(di)) {
+ err = PTR_ERR(di);
+ goto out;
+ }
+ if (di) {
+ if (check_path_shared(root, path))
+ goto out;
+ } else {
+ err = 0;
+ goto out;
+ }
+ btrfs_release_path(root, path);
+
+ ref = btrfs_lookup_inode_ref(trans, root, path,
+ dentry->d_name.name, dentry->d_name.len,
+ inode->i_ino, dir->i_ino, 0);
+ if (IS_ERR(ref)) {
+ err = PTR_ERR(ref);
+ goto out;
+ }
+ BUG_ON(!ref);
+ if (check_path_shared(root, path))
+ goto out;
+ index = btrfs_inode_ref_index(path->nodes[0], ref);
+ btrfs_release_path(root, path);
+
+ di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, index,
+ dentry->d_name.name, dentry->d_name.len, 0);
+ if (IS_ERR(di)) {
+ err = PTR_ERR(di);
+ goto out;
+ }
+ BUG_ON(ret == -ENOENT);
+ if (check_path_shared(root, path))
+ goto out;
+
+ err = 0;
+out:
+ btrfs_free_path(path);
+ if (err) {
+ btrfs_end_transaction(trans, root);
+ root->fs_info->enospc_unlink = 0;
+ return ERR_PTR(err);
+ }
+
+ trans->block_rsv = &root->fs_info->global_block_rsv;
+ return trans;
+}
+
+static void __unlink_end_trans(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
+{
+ if (trans->block_rsv == &root->fs_info->global_block_rsv) {
+ BUG_ON(!root->fs_info->enospc_unlink);
+ root->fs_info->enospc_unlink = 0;
+ }
+ btrfs_end_transaction_throttle(trans, root);
+}
+
+static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct btrfs_root *root = BTRFS_I(dir)->root;
+ struct btrfs_trans_handle *trans;
+ struct inode *inode = dentry->d_inode;
+ int ret;
+ unsigned long nr = 0;
+
+ trans = __unlink_start_trans(dir, dentry);
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
+
+ btrfs_set_trans_block_group(trans, dir);
+
+ btrfs_record_unlink_dir(trans, dir, dentry->d_inode, 0);
+
+ ret = btrfs_unlink_inode(trans, root, dir, dentry->d_inode,
+ dentry->d_name.name, dentry->d_name.len);
+ BUG_ON(ret);
+
+ if (inode->i_nlink == 0) {
+ ret = btrfs_orphan_add(trans, inode);
+ BUG_ON(ret);
+ }
+
+ nr = trans->blocks_used;
+ __unlink_end_trans(trans, root);
+ btrfs_btree_balance_dirty(root, nr);
+ return ret;
+}
+
+int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct inode *dir, u64 objectid,
+ const char *name, int name_len)
+{
+ struct btrfs_path *path;
+ struct extent_buffer *leaf;
+ struct btrfs_dir_item *di;
+ struct btrfs_key key;
+ u64 index;
+ int ret;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
+ name, name_len, -1);
+ BUG_ON(!di || IS_ERR(di));
+
+ leaf = path->nodes[0];
+ btrfs_dir_item_key_to_cpu(leaf, di, &key);
+ WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid);
+ ret = btrfs_delete_one_dir_name(trans, root, path, di);
+ BUG_ON(ret);
+ btrfs_release_path(root, path);
+
+ ret = btrfs_del_root_ref(trans, root->fs_info->tree_root,
+ objectid, root->root_key.objectid,
+ dir->i_ino, &index, name, name_len);
+ if (ret < 0) {
+ BUG_ON(ret != -ENOENT);
+ di = btrfs_search_dir_index_item(root, path, dir->i_ino,
+ name, name_len);
+ BUG_ON(!di || IS_ERR(di));
+
+ leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
btrfs_release_path(root, path);
index = key.offset;
{
struct inode *inode = dentry->d_inode;
int err = 0;
- int ret;
struct btrfs_root *root = BTRFS_I(dir)->root;
struct btrfs_trans_handle *trans;
unsigned long nr = 0;
inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
return -ENOTEMPTY;
- ret = btrfs_reserve_metadata_space(root, 5);
- if (ret)
- return ret;
-
- trans = btrfs_start_transaction(root, 1);
- if (IS_ERR(trans)) {
- btrfs_unreserve_metadata_space(root, 5);
+ trans = __unlink_start_trans(dir, dentry);
+ if (IS_ERR(trans))
return PTR_ERR(trans);
- }
btrfs_set_trans_block_group(trans, dir);
btrfs_i_size_write(inode, 0);
out:
nr = trans->blocks_used;
- ret = btrfs_end_transaction_throttle(trans, root);
- btrfs_unreserve_metadata_space(root, 5);
+ __unlink_end_trans(trans, root);
btrfs_btree_balance_dirty(root, nr);
- if (ret && !err)
- err = ret;
return err;
}
if (pending_del_nr) {
ret = btrfs_del_items(trans, root, path, pending_del_slot,
pending_del_nr);
+ BUG_ON(ret);
}
btrfs_free_path(path);
return err;
if ((offset & (blocksize - 1)) == 0)
goto out;
- ret = btrfs_check_data_free_space(root, inode, PAGE_CACHE_SIZE);
- if (ret)
- goto out;
-
- ret = btrfs_reserve_metadata_for_delalloc(root, inode, 1);
+ ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE);
if (ret)
goto out;
again:
page = grab_cache_page(mapping, index);
if (!page) {
- btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
- btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
+ btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE);
goto out;
}
out_unlock:
if (ret)
- btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
- btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
+ btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE);
unlock_page(page);
page_cache_release(page);
out:
struct btrfs_trans_handle *trans;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
- struct extent_map *em;
+ struct extent_map *em = NULL;
struct extent_state *cached_state = NULL;
u64 mask = root->sectorsize - 1;
u64 hole_start = (inode->i_size + mask) & ~mask;
u64 hint_byte = 0;
hole_size = last_byte - cur_offset;
- err = btrfs_reserve_metadata_space(root, 2);
- if (err)
+ trans = btrfs_start_transaction(root, 2);
+ if (IS_ERR(trans)) {
+ err = PTR_ERR(trans);
break;
-
- trans = btrfs_start_transaction(root, 1);
+ }
btrfs_set_trans_block_group(trans, inode);
err = btrfs_drop_extents(trans, inode, cur_offset,
last_byte - 1, 0);
btrfs_end_transaction(trans, root);
- btrfs_unreserve_metadata_space(root, 2);
}
free_extent_map(em);
+ em = NULL;
cur_offset = last_byte;
if (cur_offset >= block_end)
break;
}
+ free_extent_map(em);
unlock_extent_cached(io_tree, hole_start, block_end - 1, &cached_state,
GFP_NOFS);
return err;
}
}
- ret = btrfs_reserve_metadata_space(root, 1);
- if (ret)
- return ret;
+ trans = btrfs_start_transaction(root, 5);
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
- trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, inode);
ret = btrfs_orphan_add(trans, inode);
nr = trans->blocks_used;
btrfs_end_transaction(trans, root);
- btrfs_unreserve_metadata_space(root, 1);
btrfs_btree_balance_dirty(root, nr);
if (attr->ia_size > inode->i_size) {
i_size_write(inode, attr->ia_size);
btrfs_ordered_update_i_size(inode, inode->i_size, NULL);
- trans = btrfs_start_transaction(root, 1);
+ trans = btrfs_start_transaction(root, 0);
+ BUG_ON(IS_ERR(trans));
btrfs_set_trans_block_group(trans, inode);
+ trans->block_rsv = root->orphan_block_rsv;
+ BUG_ON(!trans->block_rsv);
ret = btrfs_update_inode(trans, root, inode);
BUG_ON(ret);
btrfs_i_size_write(inode, 0);
while (1) {
- trans = btrfs_start_transaction(root, 1);
+ trans = btrfs_start_transaction(root, 0);
+ BUG_ON(IS_ERR(trans));
btrfs_set_trans_block_group(trans, inode);
- ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0);
+ trans->block_rsv = root->orphan_block_rsv;
+
+ ret = btrfs_block_rsv_check(trans, root,
+ root->orphan_block_rsv, 0, 5);
+ if (ret) {
+ BUG_ON(ret != -EAGAIN);
+ ret = btrfs_commit_transaction(trans, root);
+ BUG_ON(ret);
+ continue;
+ }
+ ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0);
if (ret != -EAGAIN)
break;
btrfs_end_transaction(trans, root);
trans = NULL;
btrfs_btree_balance_dirty(root, nr);
+
}
if (ret == 0) {
return 0;
}
-static noinline void init_btrfs_i(struct inode *inode)
-{
- struct btrfs_inode *bi = BTRFS_I(inode);
-
- bi->generation = 0;
- bi->sequence = 0;
- bi->last_trans = 0;
- bi->last_sub_trans = 0;
- bi->logged_trans = 0;
- bi->delalloc_bytes = 0;
- bi->reserved_bytes = 0;
- bi->disk_i_size = 0;
- bi->flags = 0;
- bi->index_cnt = (u64)-1;
- bi->last_unlink_trans = 0;
- bi->ordered_data_close = 0;
- bi->force_compress = 0;
- extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
- extent_io_tree_init(&BTRFS_I(inode)->io_tree,
- inode->i_mapping, GFP_NOFS);
- extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
- inode->i_mapping, GFP_NOFS);
- INIT_LIST_HEAD(&BTRFS_I(inode)->delalloc_inodes);
- INIT_LIST_HEAD(&BTRFS_I(inode)->ordered_operations);
- RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
- btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree);
- mutex_init(&BTRFS_I(inode)->log_mutex);
-}
-
static int btrfs_init_locked_inode(struct inode *inode, void *p)
{
struct btrfs_iget_args *args = p;
inode->i_ino = args->ino;
- init_btrfs_i(inode);
BTRFS_I(inode)->root = args->root;
btrfs_set_inode_space_info(args->root, inode);
return 0;
if (!inode)
return ERR_PTR(-ENOMEM);
- init_btrfs_i(inode);
-
BTRFS_I(inode)->root = root;
memcpy(&BTRFS_I(inode)->location, key, sizeof(*key));
BTRFS_I(inode)->dummy_inode = 1;
struct btrfs_trans_handle *trans;
int ret = 0;
- if (root->fs_info->btree_inode == inode)
+ if (BTRFS_I(inode)->dummy_inode)
return 0;
if (wbc->sync_mode == WB_SYNC_ALL) {
{
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
+ int ret;
+
+ if (BTRFS_I(inode)->dummy_inode)
+ return;
trans = btrfs_join_transaction(root, 1);
btrfs_set_trans_block_group(trans, inode);
- btrfs_update_inode(trans, root, inode);
+
+ ret = btrfs_update_inode(trans, root, inode);
+ if (ret && ret == -ENOSPC) {
+ /* whoops, lets try again with the full transaction */
+ btrfs_end_transaction(trans, root);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
+
+ ret = btrfs_update_inode(trans, root, inode);
+ if (ret) {
+ printk(KERN_ERR"btrfs: fail to dirty inode %lu error %d\n",
+ inode->i_ino, ret);
+ }
+ }
btrfs_end_transaction(trans, root);
}
* btrfs_get_inode_index_count has an explanation for the magic
* number
*/
- init_btrfs_i(inode);
BTRFS_I(inode)->index_cnt = 2;
BTRFS_I(inode)->root = root;
BTRFS_I(inode)->generation = trans->transid;
if (!new_valid_dev(rdev))
return -EINVAL;
+ err = btrfs_find_free_objectid(NULL, root, dir->i_ino, &objectid);
+ if (err)
+ return err;
+
/*
* 2 for inode item and ref
* 2 for dir items
* 1 for xattr if selinux is on
*/
- err = btrfs_reserve_metadata_space(root, 5);
- if (err)
- return err;
+ trans = btrfs_start_transaction(root, 5);
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
- trans = btrfs_start_transaction(root, 1);
- if (!trans)
- goto fail;
btrfs_set_trans_block_group(trans, dir);
- err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
- if (err) {
- err = -ENOSPC;
- goto out_unlock;
- }
-
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
dentry->d_name.len,
dentry->d_parent->d_inode->i_ino, objectid,
out_unlock:
nr = trans->blocks_used;
btrfs_end_transaction_throttle(trans, root);
-fail:
- btrfs_unreserve_metadata_space(root, 5);
+ btrfs_btree_balance_dirty(root, nr);
if (drop_inode) {
inode_dec_link_count(inode);
iput(inode);
}
- btrfs_btree_balance_dirty(root, nr);
return err;
}
struct btrfs_trans_handle *trans;
struct btrfs_root *root = BTRFS_I(dir)->root;
struct inode *inode = NULL;
- int err;
int drop_inode = 0;
+ int err;
unsigned long nr = 0;
u64 objectid;
u64 index = 0;
+ err = btrfs_find_free_objectid(NULL, root, dir->i_ino, &objectid);
+ if (err)
+ return err;
/*
* 2 for inode item and ref
* 2 for dir items
* 1 for xattr if selinux is on
*/
- err = btrfs_reserve_metadata_space(root, 5);
- if (err)
- return err;
+ trans = btrfs_start_transaction(root, 5);
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
- trans = btrfs_start_transaction(root, 1);
- if (!trans)
- goto fail;
btrfs_set_trans_block_group(trans, dir);
- err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
- if (err) {
- err = -ENOSPC;
- goto out_unlock;
- }
-
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
dentry->d_name.len,
dentry->d_parent->d_inode->i_ino,
out_unlock:
nr = trans->blocks_used;
btrfs_end_transaction_throttle(trans, root);
-fail:
- btrfs_unreserve_metadata_space(root, 5);
if (drop_inode) {
inode_dec_link_count(inode);
iput(inode);
if (root->objectid != BTRFS_I(inode)->root->objectid)
return -EPERM;
- /*
- * 1 item for inode ref
- * 2 items for dir items
- */
- err = btrfs_reserve_metadata_space(root, 3);
- if (err)
- return err;
-
btrfs_inc_nlink(inode);
err = btrfs_set_inode_index(dir, &index);
if (err)
goto fail;
- trans = btrfs_start_transaction(root, 1);
+ /*
+ * 1 item for inode ref
+ * 2 items for dir items
+ */
+ trans = btrfs_start_transaction(root, 3);
+ if (IS_ERR(trans)) {
+ err = PTR_ERR(trans);
+ goto fail;
+ }
btrfs_set_trans_block_group(trans, dir);
atomic_inc(&inode->i_count);
nr = trans->blocks_used;
btrfs_end_transaction_throttle(trans, root);
fail:
- btrfs_unreserve_metadata_space(root, 3);
if (drop_inode) {
inode_dec_link_count(inode);
iput(inode);
u64 index = 0;
unsigned long nr = 1;
+ err = btrfs_find_free_objectid(NULL, root, dir->i_ino, &objectid);
+ if (err)
+ return err;
+
/*
* 2 items for inode and ref
* 2 items for dir items
* 1 for xattr if selinux is on
*/
- err = btrfs_reserve_metadata_space(root, 5);
- if (err)
- return err;
-
- trans = btrfs_start_transaction(root, 1);
- if (!trans) {
- err = -ENOMEM;
- goto out_unlock;
- }
+ trans = btrfs_start_transaction(root, 5);
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
btrfs_set_trans_block_group(trans, dir);
- err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
- if (err) {
- err = -ENOSPC;
- goto out_fail;
- }
-
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
dentry->d_name.len,
dentry->d_parent->d_inode->i_ino, objectid,
out_fail:
nr = trans->blocks_used;
btrfs_end_transaction_throttle(trans, root);
-
-out_unlock:
- btrfs_unreserve_metadata_space(root, 5);
if (drop_on_err)
iput(inode);
btrfs_btree_balance_dirty(root, nr);
}
flush_dcache_page(page);
} else if (create && PageUptodate(page)) {
+ WARN_ON(1);
if (!trans) {
kunmap(page);
free_extent_map(em);
return em;
}
-static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov, loff_t offset,
- unsigned long nr_segs)
+static struct extent_map *btrfs_new_extent_direct(struct inode *inode,
+ u64 start, u64 len)
{
- return -EINVAL;
-}
-
-static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
- __u64 start, __u64 len)
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_trans_handle *trans;
+ struct extent_map *em;
+ struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
+ struct btrfs_key ins;
+ u64 alloc_hint;
+ int ret;
+
+ btrfs_drop_extent_cache(inode, start, start + len - 1, 0);
+
+ trans = btrfs_join_transaction(root, 0);
+ if (!trans)
+ return ERR_PTR(-ENOMEM);
+
+ trans->block_rsv = &root->fs_info->delalloc_block_rsv;
+
+ alloc_hint = get_extent_allocation_hint(inode, start, len);
+ ret = btrfs_reserve_extent(trans, root, len, root->sectorsize, 0,
+ alloc_hint, (u64)-1, &ins, 1);
+ if (ret) {
+ em = ERR_PTR(ret);
+ goto out;
+ }
+
+ em = alloc_extent_map(GFP_NOFS);
+ if (!em) {
+ em = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
+ em->start = start;
+ em->orig_start = em->start;
+ em->len = ins.offset;
+
+ em->block_start = ins.objectid;
+ em->block_len = ins.offset;
+ em->bdev = root->fs_info->fs_devices->latest_bdev;
+ set_bit(EXTENT_FLAG_PINNED, &em->flags);
+
+ while (1) {
+ write_lock(&em_tree->lock);
+ ret = add_extent_mapping(em_tree, em);
+ write_unlock(&em_tree->lock);
+ if (ret != -EEXIST)
+ break;
+ btrfs_drop_extent_cache(inode, start, start + em->len - 1, 0);
+ }
+
+ ret = btrfs_add_ordered_extent_dio(inode, start, ins.objectid,
+ ins.offset, ins.offset, 0);
+ if (ret) {
+ btrfs_free_reserved_extent(root, ins.objectid, ins.offset);
+ em = ERR_PTR(ret);
+ }
+out:
+ btrfs_end_transaction(trans, root);
+ return em;
+}
+
+/*
+ * returns 1 when the nocow is safe, < 1 on error, 0 if the
+ * block must be cow'd
+ */
+static noinline int can_nocow_odirect(struct btrfs_trans_handle *trans,
+ struct inode *inode, u64 offset, u64 len)
+{
+ struct btrfs_path *path;
+ int ret;
+ struct extent_buffer *leaf;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_file_extent_item *fi;
+ struct btrfs_key key;
+ u64 disk_bytenr;
+ u64 backref_offset;
+ u64 extent_end;
+ u64 num_bytes;
+ int slot;
+ int found_type;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino,
+ offset, 0);
+ if (ret < 0)
+ goto out;
+
+ slot = path->slots[0];
+ if (ret == 1) {
+ if (slot == 0) {
+ /* can't find the item, must cow */
+ ret = 0;
+ goto out;
+ }
+ slot--;
+ }
+ ret = 0;
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &key, slot);
+ if (key.objectid != inode->i_ino ||
+ key.type != BTRFS_EXTENT_DATA_KEY) {
+ /* not our file or wrong item type, must cow */
+ goto out;
+ }
+
+ if (key.offset > offset) {
+ /* Wrong offset, must cow */
+ goto out;
+ }
+
+ fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
+ found_type = btrfs_file_extent_type(leaf, fi);
+ if (found_type != BTRFS_FILE_EXTENT_REG &&
+ found_type != BTRFS_FILE_EXTENT_PREALLOC) {
+ /* not a regular extent, must cow */
+ goto out;
+ }
+ disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
+ backref_offset = btrfs_file_extent_offset(leaf, fi);
+
+ extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
+ if (extent_end < offset + len) {
+ /* extent doesn't include our full range, must cow */
+ goto out;
+ }
+
+ if (btrfs_extent_readonly(root, disk_bytenr))
+ goto out;
+
+ /*
+ * look for other files referencing this extent, if we
+ * find any we must cow
+ */
+ if (btrfs_cross_ref_exist(trans, root, inode->i_ino,
+ key.offset - backref_offset, disk_bytenr))
+ goto out;
+
+ /*
+ * adjust disk_bytenr and num_bytes to cover just the bytes
+ * in this extent we are about to write. If there
+ * are any csums in that range we have to cow in order
+ * to keep the csums correct
+ */
+ disk_bytenr += backref_offset;
+ disk_bytenr += offset - key.offset;
+ num_bytes = min(offset + len, extent_end) - offset;
+ if (csum_exist_in_range(root, disk_bytenr, num_bytes))
+ goto out;
+ /*
+ * all of the above have passed, it is safe to overwrite this extent
+ * without cow
+ */
+ ret = 1;
+out:
+ btrfs_free_path(path);
+ return ret;
+}
+
+static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create)
+{
+ struct extent_map *em;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ u64 start = iblock << inode->i_blkbits;
+ u64 len = bh_result->b_size;
+ struct btrfs_trans_handle *trans;
+
+ em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
+ if (IS_ERR(em))
+ return PTR_ERR(em);
+
+ /*
+ * Ok for INLINE and COMPRESSED extents we need to fallback on buffered
+ * io. INLINE is special, and we could probably kludge it in here, but
+ * it's still buffered so for safety lets just fall back to the generic
+ * buffered path.
+ *
+ * For COMPRESSED we _have_ to read the entire extent in so we can
+ * decompress it, so there will be buffering required no matter what we
+ * do, so go ahead and fallback to buffered.
+ *
+ * We return -ENOTBLK because thats what makes DIO go ahead and go back
+ * to buffered IO. Don't blame me, this is the price we pay for using
+ * the generic code.
+ */
+ if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) ||
+ em->block_start == EXTENT_MAP_INLINE) {
+ free_extent_map(em);
+ return -ENOTBLK;
+ }
+
+ /* Just a good old fashioned hole, return */
+ if (!create && (em->block_start == EXTENT_MAP_HOLE ||
+ test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) {
+ free_extent_map(em);
+ /* DIO will do one hole at a time, so just unlock a sector */
+ unlock_extent(&BTRFS_I(inode)->io_tree, start,
+ start + root->sectorsize - 1, GFP_NOFS);
+ return 0;
+ }
+
+ /*
+ * We don't allocate a new extent in the following cases
+ *
+ * 1) The inode is marked as NODATACOW. In this case we'll just use the
+ * existing extent.
+ * 2) The extent is marked as PREALLOC. We're good to go here and can
+ * just use the extent.
+ *
+ */
+ if (!create) {
+ len = em->len - (start - em->start);
+ goto map;
+ }
+
+ if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) ||
+ ((BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) &&
+ em->block_start != EXTENT_MAP_HOLE)) {
+ int type;
+ int ret;
+ u64 block_start;
+
+ if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
+ type = BTRFS_ORDERED_PREALLOC;
+ else
+ type = BTRFS_ORDERED_NOCOW;
+ len = min(len, em->len - (start - em->start));
+ block_start = em->block_start + (start - em->start);
+
+ /*
+ * we're not going to log anything, but we do need
+ * to make sure the current transaction stays open
+ * while we look for nocow cross refs
+ */
+ trans = btrfs_join_transaction(root, 0);
+ if (!trans)
+ goto must_cow;
+
+ if (can_nocow_odirect(trans, inode, start, len) == 1) {
+ ret = btrfs_add_ordered_extent_dio(inode, start,
+ block_start, len, len, type);
+ btrfs_end_transaction(trans, root);
+ if (ret) {
+ free_extent_map(em);
+ return ret;
+ }
+ goto unlock;
+ }
+ btrfs_end_transaction(trans, root);
+ }
+must_cow:
+ /*
+ * this will cow the extent, reset the len in case we changed
+ * it above
+ */
+ len = bh_result->b_size;
+ free_extent_map(em);
+ em = btrfs_new_extent_direct(inode, start, len);
+ if (IS_ERR(em))
+ return PTR_ERR(em);
+ len = min(len, em->len - (start - em->start));
+unlock:
+ clear_extent_bit(&BTRFS_I(inode)->io_tree, start, start + len - 1,
+ EXTENT_LOCKED | EXTENT_DELALLOC | EXTENT_DIRTY, 1,
+ 0, NULL, GFP_NOFS);
+map:
+ bh_result->b_blocknr = (em->block_start + (start - em->start)) >>
+ inode->i_blkbits;
+ bh_result->b_size = len;
+ bh_result->b_bdev = em->bdev;
+ set_buffer_mapped(bh_result);
+ if (create && !test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
+ set_buffer_new(bh_result);
+
+ free_extent_map(em);
+
+ return 0;
+}
+
+struct btrfs_dio_private {
+ struct inode *inode;
+ u64 logical_offset;
+ u64 disk_bytenr;
+ u64 bytes;
+ u32 *csums;
+ void *private;
+};
+
+static void btrfs_endio_direct_read(struct bio *bio, int err)
+{
+ struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1;
+ struct bio_vec *bvec = bio->bi_io_vec;
+ struct btrfs_dio_private *dip = bio->bi_private;
+ struct inode *inode = dip->inode;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ u64 start;
+ u32 *private = dip->csums;
+
+ start = dip->logical_offset;
+ do {
+ if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) {
+ struct page *page = bvec->bv_page;
+ char *kaddr;
+ u32 csum = ~(u32)0;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ kaddr = kmap_atomic(page, KM_IRQ0);
+ csum = btrfs_csum_data(root, kaddr + bvec->bv_offset,
+ csum, bvec->bv_len);
+ btrfs_csum_final(csum, (char *)&csum);
+ kunmap_atomic(kaddr, KM_IRQ0);
+ local_irq_restore(flags);
+
+ flush_dcache_page(bvec->bv_page);
+ if (csum != *private) {
+ printk(KERN_ERR "btrfs csum failed ino %lu off"
+ " %llu csum %u private %u\n",
+ inode->i_ino, (unsigned long long)start,
+ csum, *private);
+ err = -EIO;
+ }
+ }
+
+ start += bvec->bv_len;
+ private++;
+ bvec++;
+ } while (bvec <= bvec_end);
+
+ unlock_extent(&BTRFS_I(inode)->io_tree, dip->logical_offset,
+ dip->logical_offset + dip->bytes - 1, GFP_NOFS);
+ bio->bi_private = dip->private;
+
+ kfree(dip->csums);
+ kfree(dip);
+ dio_end_io(bio, err);
+}
+
+static void btrfs_endio_direct_write(struct bio *bio, int err)
+{
+ struct btrfs_dio_private *dip = bio->bi_private;
+ struct inode *inode = dip->inode;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_ordered_extent *ordered = NULL;
+ struct extent_state *cached_state = NULL;
+ int ret;
+
+ if (err)
+ goto out_done;
+
+ ret = btrfs_dec_test_ordered_pending(inode, &ordered,
+ dip->logical_offset, dip->bytes);
+ if (!ret)
+ goto out_done;
+
+ BUG_ON(!ordered);
+
+ trans = btrfs_join_transaction(root, 1);
+ if (!trans) {
+ err = -ENOMEM;
+ goto out;
+ }
+ trans->block_rsv = &root->fs_info->delalloc_block_rsv;
+
+ if (test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags)) {
+ ret = btrfs_ordered_update_i_size(inode, 0, ordered);
+ if (!ret)
+ ret = btrfs_update_inode(trans, root, inode);
+ err = ret;
+ goto out;
+ }
+
+ lock_extent_bits(&BTRFS_I(inode)->io_tree, ordered->file_offset,
+ ordered->file_offset + ordered->len - 1, 0,
+ &cached_state, GFP_NOFS);
+
+ if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags)) {
+ ret = btrfs_mark_extent_written(trans, inode,
+ ordered->file_offset,
+ ordered->file_offset +
+ ordered->len);
+ if (ret) {
+ err = ret;
+ goto out_unlock;
+ }
+ } else {
+ ret = insert_reserved_file_extent(trans, inode,
+ ordered->file_offset,
+ ordered->start,
+ ordered->disk_len,
+ ordered->len,
+ ordered->len,
+ 0, 0, 0,
+ BTRFS_FILE_EXTENT_REG);
+ unpin_extent_cache(&BTRFS_I(inode)->extent_tree,
+ ordered->file_offset, ordered->len);
+ if (ret) {
+ err = ret;
+ WARN_ON(1);
+ goto out_unlock;
+ }
+ }
+
+ add_pending_csums(trans, inode, ordered->file_offset, &ordered->list);
+ btrfs_ordered_update_i_size(inode, 0, ordered);
+ btrfs_update_inode(trans, root, inode);
+out_unlock:
+ unlock_extent_cached(&BTRFS_I(inode)->io_tree, ordered->file_offset,
+ ordered->file_offset + ordered->len - 1,
+ &cached_state, GFP_NOFS);
+out:
+ btrfs_delalloc_release_metadata(inode, ordered->len);
+ btrfs_end_transaction(trans, root);
+ btrfs_put_ordered_extent(ordered);
+ btrfs_put_ordered_extent(ordered);
+out_done:
+ bio->bi_private = dip->private;
+
+ kfree(dip->csums);
+ kfree(dip);
+ dio_end_io(bio, err);
+}
+
+static int __btrfs_submit_bio_start_direct_io(struct inode *inode, int rw,
+ struct bio *bio, int mirror_num,
+ unsigned long bio_flags, u64 offset)
+{
+ int ret;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ ret = btrfs_csum_one_bio(root, inode, bio, offset, 1);
+ BUG_ON(ret);
+ return 0;
+}
+
+static void btrfs_submit_direct(int rw, struct bio *bio, struct inode *inode,
+ loff_t file_offset)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_dio_private *dip;
+ struct bio_vec *bvec = bio->bi_io_vec;
+ u64 start;
+ int skip_sum;
+ int write = rw & (1 << BIO_RW);
+ int ret = 0;
+
+ skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
+
+ dip = kmalloc(sizeof(*dip), GFP_NOFS);
+ if (!dip) {
+ ret = -ENOMEM;
+ goto free_ordered;
+ }
+ dip->csums = NULL;
+
+ if (!skip_sum) {
+ dip->csums = kmalloc(sizeof(u32) * bio->bi_vcnt, GFP_NOFS);
+ if (!dip->csums) {
+ ret = -ENOMEM;
+ goto free_ordered;
+ }
+ }
+
+ dip->private = bio->bi_private;
+ dip->inode = inode;
+ dip->logical_offset = file_offset;
+
+ start = dip->logical_offset;
+ dip->bytes = 0;
+ do {
+ dip->bytes += bvec->bv_len;
+ bvec++;
+ } while (bvec <= (bio->bi_io_vec + bio->bi_vcnt - 1));
+
+ dip->disk_bytenr = (u64)bio->bi_sector << 9;
+ bio->bi_private = dip;
+
+ if (write)
+ bio->bi_end_io = btrfs_endio_direct_write;
+ else
+ bio->bi_end_io = btrfs_endio_direct_read;
+
+ ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
+ if (ret)
+ goto out_err;
+
+ if (write && !skip_sum) {
+ ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
+ inode, rw, bio, 0, 0,
+ dip->logical_offset,
+ __btrfs_submit_bio_start_direct_io,
+ __btrfs_submit_bio_done);
+ if (ret)
+ goto out_err;
+ return;
+ } else if (!skip_sum)
+ btrfs_lookup_bio_sums_dio(root, inode, bio,
+ dip->logical_offset, dip->csums);
+
+ ret = btrfs_map_bio(root, rw, bio, 0, 1);
+ if (ret)
+ goto out_err;
+ return;
+out_err:
+ kfree(dip->csums);
+ kfree(dip);
+free_ordered:
+ /*
+ * If this is a write, we need to clean up the reserved space and kill
+ * the ordered extent.
+ */
+ if (write) {
+ struct btrfs_ordered_extent *ordered;
+ ordered = btrfs_lookup_ordered_extent(inode,
+ dip->logical_offset);
+ if (!test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags) &&
+ !test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags))
+ btrfs_free_reserved_extent(root, ordered->start,
+ ordered->disk_len);
+ btrfs_put_ordered_extent(ordered);
+ btrfs_put_ordered_extent(ordered);
+ }
+ bio_endio(bio, ret);
+}
+
+static ssize_t check_direct_IO(struct btrfs_root *root, int rw, struct kiocb *iocb,
+ const struct iovec *iov, loff_t offset,
+ unsigned long nr_segs)
+{
+ int seg;
+ size_t size;
+ unsigned long addr;
+ unsigned blocksize_mask = root->sectorsize - 1;
+ ssize_t retval = -EINVAL;
+ loff_t end = offset;
+
+ if (offset & blocksize_mask)
+ goto out;
+
+ /* Check the memory alignment. Blocks cannot straddle pages */
+ for (seg = 0; seg < nr_segs; seg++) {
+ addr = (unsigned long)iov[seg].iov_base;
+ size = iov[seg].iov_len;
+ end += size;
+ if ((addr & blocksize_mask) || (size & blocksize_mask))
+ goto out;
+ }
+ retval = 0;
+out:
+ return retval;
+}
+static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
+ const struct iovec *iov, loff_t offset,
+ unsigned long nr_segs)
+{
+ struct file *file = iocb->ki_filp;
+ struct inode *inode = file->f_mapping->host;
+ struct btrfs_ordered_extent *ordered;
+ struct extent_state *cached_state = NULL;
+ u64 lockstart, lockend;
+ ssize_t ret;
+ int writing = rw & WRITE;
+ int write_bits = 0;
+ size_t count = iov_length(iov, nr_segs);
+
+ if (check_direct_IO(BTRFS_I(inode)->root, rw, iocb, iov,
+ offset, nr_segs)) {
+ return 0;
+ }
+
+ lockstart = offset;
+ lockend = offset + count - 1;
+
+ if (writing) {
+ ret = btrfs_delalloc_reserve_space(inode, count);
+ if (ret)
+ goto out;
+ }
+
+ while (1) {
+ lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend,
+ 0, &cached_state, GFP_NOFS);
+ /*
+ * We're concerned with the entire range that we're going to be
+ * doing DIO to, so we need to make sure theres no ordered
+ * extents in this range.
+ */
+ ordered = btrfs_lookup_ordered_range(inode, lockstart,
+ lockend - lockstart + 1);
+ if (!ordered)
+ break;
+ unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend,
+ &cached_state, GFP_NOFS);
+ btrfs_start_ordered_extent(inode, ordered, 1);
+ btrfs_put_ordered_extent(ordered);
+ cond_resched();
+ }
+
+ /*
+ * we don't use btrfs_set_extent_delalloc because we don't want
+ * the dirty or uptodate bits
+ */
+ if (writing) {
+ write_bits = EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING;
+ ret = set_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend,
+ EXTENT_DELALLOC, 0, NULL, &cached_state,
+ GFP_NOFS);
+ if (ret) {
+ clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart,
+ lockend, EXTENT_LOCKED | write_bits,
+ 1, 0, &cached_state, GFP_NOFS);
+ goto out;
+ }
+ }
+
+ free_extent_state(cached_state);
+ cached_state = NULL;
+
+ ret = __blockdev_direct_IO(rw, iocb, inode,
+ BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev,
+ iov, offset, nr_segs, btrfs_get_blocks_direct, NULL,
+ btrfs_submit_direct, 0);
+
+ if (ret < 0 && ret != -EIOCBQUEUED) {
+ clear_extent_bit(&BTRFS_I(inode)->io_tree, offset,
+ offset + iov_length(iov, nr_segs) - 1,
+ EXTENT_LOCKED | write_bits, 1, 0,
+ &cached_state, GFP_NOFS);
+ } else if (ret >= 0 && ret < iov_length(iov, nr_segs)) {
+ /*
+ * We're falling back to buffered, unlock the section we didn't
+ * do IO on.
+ */
+ clear_extent_bit(&BTRFS_I(inode)->io_tree, offset + ret,
+ offset + iov_length(iov, nr_segs) - 1,
+ EXTENT_LOCKED | write_bits, 1, 0,
+ &cached_state, GFP_NOFS);
+ }
+out:
+ free_extent_state(cached_state);
+ return ret;
+}
+
+static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
+ __u64 start, __u64 len)
{
return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent);
}
u64 page_start;
u64 page_end;
- ret = btrfs_check_data_free_space(root, inode, PAGE_CACHE_SIZE);
+ ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE);
if (ret) {
if (ret == -ENOMEM)
ret = VM_FAULT_OOM;
goto out;
}
- ret = btrfs_reserve_metadata_for_delalloc(root, inode, 1);
- if (ret) {
- btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
- ret = VM_FAULT_SIGBUS;
- goto out;
- }
-
ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */
again:
lock_page(page);
if ((page->mapping != inode->i_mapping) ||
(page_start >= size)) {
- btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
/* page got truncated out from underneath us */
goto out_unlock;
}
unlock_extent_cached(io_tree, page_start, page_end,
&cached_state, GFP_NOFS);
ret = VM_FAULT_SIGBUS;
- btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
goto out_unlock;
}
ret = 0;
unlock_extent_cached(io_tree, page_start, page_end, &cached_state, GFP_NOFS);
out_unlock:
- btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
if (!ret)
return VM_FAULT_LOCKED;
unlock_page(page);
+ btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE);
out:
return ret;
}
btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1);
btrfs_ordered_update_i_size(inode, inode->i_size, NULL);
- trans = btrfs_start_transaction(root, 1);
+ trans = btrfs_start_transaction(root, 0);
+ BUG_ON(IS_ERR(trans));
btrfs_set_trans_block_group(trans, inode);
+ trans->block_rsv = root->orphan_block_rsv;
/*
* setattr is responsible for setting the ordered_data_close flag,
btrfs_add_ordered_operation(trans, root, inode);
while (1) {
+ if (!trans) {
+ trans = btrfs_start_transaction(root, 0);
+ BUG_ON(IS_ERR(trans));
+ btrfs_set_trans_block_group(trans, inode);
+ trans->block_rsv = root->orphan_block_rsv;
+ }
+
+ ret = btrfs_block_rsv_check(trans, root,
+ root->orphan_block_rsv, 0, 5);
+ if (ret) {
+ BUG_ON(ret != -EAGAIN);
+ ret = btrfs_commit_transaction(trans, root);
+ BUG_ON(ret);
+ trans = NULL;
+ continue;
+ }
+
ret = btrfs_truncate_inode_items(trans, root, inode,
inode->i_size,
BTRFS_EXTENT_DATA_KEY);
nr = trans->blocks_used;
btrfs_end_transaction(trans, root);
+ trans = NULL;
btrfs_btree_balance_dirty(root, nr);
-
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, inode);
}
if (ret == 0 && inode->i_nlink > 0) {
struct inode *btrfs_alloc_inode(struct super_block *sb)
{
struct btrfs_inode *ei;
+ struct inode *inode;
ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
if (!ei)
return NULL;
+
+ ei->root = NULL;
+ ei->space_info = NULL;
+ ei->generation = 0;
+ ei->sequence = 0;
ei->last_trans = 0;
ei->last_sub_trans = 0;
ei->logged_trans = 0;
- ei->outstanding_extents = 0;
- ei->reserved_extents = 0;
- ei->root = NULL;
+ ei->delalloc_bytes = 0;
+ ei->reserved_bytes = 0;
+ ei->disk_i_size = 0;
+ ei->flags = 0;
+ ei->index_cnt = (u64)-1;
+ ei->last_unlink_trans = 0;
+
spin_lock_init(&ei->accounting_lock);
+ atomic_set(&ei->outstanding_extents, 0);
+ ei->reserved_extents = 0;
+
+ ei->ordered_data_close = 0;
+ ei->orphan_meta_reserved = 0;
+ ei->dummy_inode = 0;
+ ei->force_compress = 0;
+
+ inode = &ei->vfs_inode;
+ extent_map_tree_init(&ei->extent_tree, GFP_NOFS);
+ extent_io_tree_init(&ei->io_tree, &inode->i_data, GFP_NOFS);
+ extent_io_tree_init(&ei->io_failure_tree, &inode->i_data, GFP_NOFS);
+ mutex_init(&ei->log_mutex);
btrfs_ordered_inode_tree_init(&ei->ordered_tree);
INIT_LIST_HEAD(&ei->i_orphan);
+ INIT_LIST_HEAD(&ei->delalloc_inodes);
INIT_LIST_HEAD(&ei->ordered_operations);
- return &ei->vfs_inode;
+ RB_CLEAR_NODE(&ei->rb_node);
+
+ return inode;
}
void btrfs_destroy_inode(struct inode *inode)
WARN_ON(!list_empty(&inode->i_dentry));
WARN_ON(inode->i_data.nrpages);
+ WARN_ON(atomic_read(&BTRFS_I(inode)->outstanding_extents));
+ WARN_ON(BTRFS_I(inode)->reserved_extents);
/*
* This can happen where we create an inode, but somebody else also
spin_unlock(&root->fs_info->ordered_extent_lock);
}
- spin_lock(&root->list_lock);
+ spin_lock(&root->orphan_lock);
if (!list_empty(&BTRFS_I(inode)->i_orphan)) {
printk(KERN_INFO "BTRFS: inode %lu still on the orphan list\n",
inode->i_ino);
list_del_init(&BTRFS_I(inode)->i_orphan);
}
- spin_unlock(&root->list_lock);
+ spin_unlock(&root->orphan_lock);
while (1) {
ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1);
void btrfs_drop_inode(struct inode *inode)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
-
if (inode->i_nlink > 0 && btrfs_root_refs(&root->root_item) == 0)
generic_delete_inode(inode);
else
if (S_ISDIR(old_inode->i_mode) && new_inode &&
new_inode->i_size > BTRFS_EMPTY_DIR_SIZE)
return -ENOTEMPTY;
-
- /*
- * We want to reserve the absolute worst case amount of items. So if
- * both inodes are subvols and we need to unlink them then that would
- * require 4 item modifications, but if they are both normal inodes it
- * would require 5 item modifications, so we'll assume their normal
- * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items
- * should cover the worst case number of items we'll modify.
- */
- ret = btrfs_reserve_metadata_space(root, 11);
- if (ret)
- return ret;
-
/*
* we're using rename to replace one file with another.
* and the replacement file is large. Start IO on it now so
/* close the racy window with snapshot create/destroy ioctl */
if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
down_read(&root->fs_info->subvol_sem);
+ /*
+ * We want to reserve the absolute worst case amount of items. So if
+ * both inodes are subvols and we need to unlink them then that would
+ * require 4 item modifications, but if they are both normal inodes it
+ * would require 5 item modifications, so we'll assume their normal
+ * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items
+ * should cover the worst case number of items we'll modify.
+ */
+ trans = btrfs_start_transaction(root, 20);
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
- trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, new_dir);
if (dest != root)
if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
up_read(&root->fs_info->subvol_sem);
- btrfs_unreserve_metadata_space(root, 11);
return ret;
}
return 0;
}
+int btrfs_start_one_delalloc_inode(struct btrfs_root *root, int delay_iput)
+{
+ struct btrfs_inode *binode;
+ struct inode *inode = NULL;
+
+ spin_lock(&root->fs_info->delalloc_lock);
+ while (!list_empty(&root->fs_info->delalloc_inodes)) {
+ binode = list_entry(root->fs_info->delalloc_inodes.next,
+ struct btrfs_inode, delalloc_inodes);
+ inode = igrab(&binode->vfs_inode);
+ if (inode) {
+ list_move_tail(&binode->delalloc_inodes,
+ &root->fs_info->delalloc_inodes);
+ break;
+ }
+
+ list_del_init(&binode->delalloc_inodes);
+ cond_resched_lock(&root->fs_info->delalloc_lock);
+ }
+ spin_unlock(&root->fs_info->delalloc_lock);
+
+ if (inode) {
+ write_inode_now(inode, 0);
+ if (delay_iput)
+ btrfs_add_delayed_iput(inode);
+ else
+ iput(inode);
+ return 1;
+ }
+ return 0;
+}
+
static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
const char *symname)
{
if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
return -ENAMETOOLONG;
+ err = btrfs_find_free_objectid(NULL, root, dir->i_ino, &objectid);
+ if (err)
+ return err;
/*
* 2 items for inode item and ref
* 2 items for dir items
* 1 item for xattr if selinux is on
*/
- err = btrfs_reserve_metadata_space(root, 5);
- if (err)
- return err;
+ trans = btrfs_start_transaction(root, 5);
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
- trans = btrfs_start_transaction(root, 1);
- if (!trans)
- goto out_fail;
btrfs_set_trans_block_group(trans, dir);
- err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
- if (err) {
- err = -ENOSPC;
- goto out_unlock;
- }
-
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
dentry->d_name.len,
dentry->d_parent->d_inode->i_ino, objectid,
out_unlock:
nr = trans->blocks_used;
btrfs_end_transaction_throttle(trans, root);
-out_fail:
- btrfs_unreserve_metadata_space(root, 5);
if (drop_inode) {
inode_dec_link_count(inode);
iput(inode);
return err;
}
-static int prealloc_file_range(struct inode *inode, u64 start, u64 end,
- u64 alloc_hint, int mode, loff_t actual_len)
+int btrfs_prealloc_file_range(struct inode *inode, int mode,
+ u64 start, u64 num_bytes, u64 min_size,
+ loff_t actual_len, u64 *alloc_hint)
{
struct btrfs_trans_handle *trans;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_key ins;
- u64 alloc_size;
u64 cur_offset = start;
- u64 num_bytes = end - start;
int ret = 0;
- u64 i_size;
while (num_bytes > 0) {
- alloc_size = min(num_bytes, root->fs_info->max_extent);
-
- trans = btrfs_start_transaction(root, 1);
-
- ret = btrfs_reserve_extent(trans, root, alloc_size,
- root->sectorsize, 0, alloc_hint,
- (u64)-1, &ins, 1);
- if (ret) {
- WARN_ON(1);
- goto stop_trans;
+ trans = btrfs_start_transaction(root, 3);
+ if (IS_ERR(trans)) {
+ ret = PTR_ERR(trans);
+ break;
}
- ret = btrfs_reserve_metadata_space(root, 3);
+ ret = btrfs_reserve_extent(trans, root, num_bytes, min_size,
+ 0, *alloc_hint, (u64)-1, &ins, 1);
if (ret) {
- btrfs_free_reserved_extent(root, ins.objectid,
- ins.offset);
- goto stop_trans;
+ btrfs_end_transaction(trans, root);
+ break;
}
ret = insert_reserved_file_extent(trans, inode,
num_bytes -= ins.offset;
cur_offset += ins.offset;
- alloc_hint = ins.objectid + ins.offset;
+ *alloc_hint = ins.objectid + ins.offset;
inode->i_ctime = CURRENT_TIME;
BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC;
if (!(mode & FALLOC_FL_KEEP_SIZE) &&
- (actual_len > inode->i_size) &&
- (cur_offset > inode->i_size)) {
-
+ (actual_len > inode->i_size) &&
+ (cur_offset > inode->i_size)) {
if (cur_offset > actual_len)
- i_size = actual_len;
+ i_size_write(inode, actual_len);
else
- i_size = cur_offset;
- i_size_write(inode, i_size);
- btrfs_ordered_update_i_size(inode, i_size, NULL);
+ i_size_write(inode, cur_offset);
+ i_size_write(inode, cur_offset);
+ btrfs_ordered_update_i_size(inode, cur_offset, NULL);
}
ret = btrfs_update_inode(trans, root, inode);
BUG_ON(ret);
btrfs_end_transaction(trans, root);
- btrfs_unreserve_metadata_space(root, 3);
}
return ret;
-
-stop_trans:
- btrfs_end_transaction(trans, root);
- return ret;
-
}
static long btrfs_fallocate(struct inode *inode, int mode,
goto out;
}
- ret = btrfs_check_data_free_space(BTRFS_I(inode)->root, inode,
- alloc_end - alloc_start);
+ ret = btrfs_check_data_free_space(inode, alloc_end - alloc_start);
if (ret)
goto out;
if (em->block_start == EXTENT_MAP_HOLE ||
(cur_offset >= inode->i_size &&
!test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) {
- ret = prealloc_file_range(inode,
- cur_offset, last_byte,
- alloc_hint, mode, offset+len);
+ ret = btrfs_prealloc_file_range(inode, 0, cur_offset,
+ last_byte - cur_offset,
+ 1 << inode->i_blkbits,
+ offset + len,
+ &alloc_hint);
if (ret < 0) {
free_extent_map(em);
break;
}
}
- if (em->block_start <= EXTENT_MAP_LAST_BYTE)
- alloc_hint = em->block_start;
free_extent_map(em);
cur_offset = last_byte;
unlock_extent_cached(&BTRFS_I(inode)->io_tree, alloc_start, locked_end,
&cached_state, GFP_NOFS);
- btrfs_free_reserved_data_space(BTRFS_I(inode)->root, inode,
- alloc_end - alloc_start);
+ btrfs_free_reserved_data_space(inode, alloc_end - alloc_start);
out:
mutex_unlock(&inode->i_mutex);
return ret;
git.openpandora.org / pandora-kernel.git / blobdiff