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ext4: use pre-allocated es in __es_insert_extent()

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[ Upstream commit 95f0b320339a977cf69872eac107122bf536775d ]

Pass a extent_status pointer prealloc to __es_insert_extent(). If the
pointer is non-null, it is used directly when a new extent_status is
needed to avoid memory allocation failures.

Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230424033846.4732-5-libaokun1@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Stable-dep-of: 8e387c89e96b ("ext4: make sure allocate pending entry not fail")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Baokun Li 2023-04-24 11:38:38 +08:00 committed by Greg Kroah-Hartman
parent 53df96011a
commit 059722ec64
1 changed files with 12 additions and 7 deletions
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19
fs/ext4/extents_status.c
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@ -144,7 +144,8 @@
static struct kmem_cache *ext4_es_cachep;
static struct kmem_cache *ext4_pending_cachep;
static int __es_insert_extent(struct inode *inode, struct extent_status *newes);
static int __es_insert_extent(struct inode *inode, struct extent_status *newes,
struct extent_status *prealloc);
static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
ext4_lblk_t end, int *reserved);
static int es_reclaim_extents(struct ext4_inode_info *ei, int *nr_to_scan);
@ -760,7 +761,8 @@ static inline void ext4_es_insert_extent_check(struct inode *inode,
}
#endif
static int __es_insert_extent(struct inode *inode, struct extent_status *newes)
static int __es_insert_extent(struct inode *inode, struct extent_status *newes,
struct extent_status *prealloc)
{
struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree;
struct rb_node **p = &tree->root.rb_node;
@ -800,7 +802,10 @@ static int __es_insert_extent(struct inode *inode, struct extent_status *newes)
}
}
es = __es_alloc_extent(false);
if (prealloc)
es = prealloc;
else
es = __es_alloc_extent(false);
if (!es)
return -ENOMEM;
ext4_es_init_extent(inode, es, newes->es_lblk, newes->es_len,
@ -857,7 +862,7 @@ int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
if (err != 0)
goto error;
retry:
err = __es_insert_extent(inode, &newes);
err = __es_insert_extent(inode, &newes, NULL);
if (err == -ENOMEM && __es_shrink(EXT4_SB(inode->i_sb),
128, EXT4_I(inode)))
goto retry;
@ -904,7 +909,7 @@ void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
es = __es_tree_search(&EXT4_I(inode)->i_es_tree.root, lblk);
if (!es || es->es_lblk > end)
__es_insert_extent(inode, &newes);
__es_insert_extent(inode, &newes, NULL);
write_unlock(&EXT4_I(inode)->i_es_lock);
}
@ -1347,7 +1352,7 @@ static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
orig_es.es_len - len2;
ext4_es_store_pblock_status(&newes, block,
ext4_es_status(&orig_es));
err = __es_insert_extent(inode, &newes);
err = __es_insert_extent(inode, &newes, NULL);
if (err) {
es->es_lblk = orig_es.es_lblk;
es->es_len = orig_es.es_len;
@ -1996,7 +2001,7 @@ int ext4_es_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk,
if (err != 0)
goto error;
retry:
err = __es_insert_extent(inode, &newes);
err = __es_insert_extent(inode, &newes, NULL);
if (err == -ENOMEM && __es_shrink(EXT4_SB(inode->i_sb),
128, EXT4_I(inode)))
goto retry;