5.4-stable review patch. If anyone has any objections, please let me know.
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From: Baokun Li libaokun1@huawei.com
[ Upstream commit 73a2f033656be11298912201ad50615307b4477a ]
Factor out __es_alloc_extent() and __es_free_extent(), which only allocate and free extent_status in these two helpers.
The ext4_es_alloc_extent() function is split into __es_alloc_extent() and ext4_es_init_extent(). In __es_alloc_extent() we allocate memory using GFP_KERNEL | __GFP_NOFAIL | __GFP_ZERO if the memory allocation cannot fail, otherwise we use GFP_ATOMIC. and the ext4_es_init_extent() is used to initialize extent_status and update related variables after a successful allocation.
This is to prepare for the use of pre-allocated extent_status later.
Signed-off-by: Baokun Li libaokun1@huawei.com Reviewed-by: Jan Kara jack@suse.cz Link: https://lore.kernel.org/r/20230424033846.4732-4-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 --- fs/ext4/extents_status.c | 30 +++++++++++++++++++----------- 1 file changed, 19 insertions(+), 11 deletions(-)
diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c index 59812c5bbe1ba..dfabb15afd3dd 100644 --- a/fs/ext4/extents_status.c +++ b/fs/ext4/extents_status.c @@ -452,14 +452,17 @@ static inline bool ext4_es_must_keep(struct extent_status *es) return false; }
-static struct extent_status * -ext4_es_alloc_extent(struct inode *inode, ext4_lblk_t lblk, ext4_lblk_t len, - ext4_fsblk_t pblk) +static inline struct extent_status *__es_alloc_extent(bool nofail) +{ + if (!nofail) + return kmem_cache_alloc(ext4_es_cachep, GFP_ATOMIC); + + return kmem_cache_zalloc(ext4_es_cachep, GFP_KERNEL | __GFP_NOFAIL); +} + +static void ext4_es_init_extent(struct inode *inode, struct extent_status *es, + ext4_lblk_t lblk, ext4_lblk_t len, ext4_fsblk_t pblk) { - struct extent_status *es; - es = kmem_cache_alloc(ext4_es_cachep, GFP_ATOMIC); - if (es == NULL) - return NULL; es->es_lblk = lblk; es->es_len = len; es->es_pblk = pblk; @@ -474,8 +477,11 @@ ext4_es_alloc_extent(struct inode *inode, ext4_lblk_t lblk, ext4_lblk_t len,
EXT4_I(inode)->i_es_all_nr++; percpu_counter_inc(&EXT4_SB(inode->i_sb)->s_es_stats.es_stats_all_cnt); +}
- return es; +static inline void __es_free_extent(struct extent_status *es) +{ + kmem_cache_free(ext4_es_cachep, es); }
static void ext4_es_free_extent(struct inode *inode, struct extent_status *es) @@ -492,7 +498,7 @@ static void ext4_es_free_extent(struct inode *inode, struct extent_status *es) s_es_stats.es_stats_shk_cnt); }
- kmem_cache_free(ext4_es_cachep, es); + __es_free_extent(es); }
/* @@ -794,10 +800,12 @@ static int __es_insert_extent(struct inode *inode, struct extent_status *newes) } }
- es = ext4_es_alloc_extent(inode, newes->es_lblk, newes->es_len, - newes->es_pblk); + es = __es_alloc_extent(false); if (!es) return -ENOMEM; + ext4_es_init_extent(inode, es, newes->es_lblk, newes->es_len, + newes->es_pblk); + rb_link_node(&es->rb_node, parent, p); rb_insert_color(&es->rb_node, &tree->root);