We will add pa_free to s_mb_preallocated when new ext4_prealloc_space is created. In ext4_mb_new_inode_pa, we will call ext4_mb_use_inode_pa before adding pa_free to s_mb_preallocated. However, ext4_mb_use_inode_pa will consume pa_free for block allocation which triggerred the creation of ext4_prealloc_space. Add pa_free to s_mb_preallocated before ext4_mb_use_inode_pa to correct calculation of s_mb_preallocated. There is no such problem in ext4_mb_new_group_pa as pa_free of group pa is consumed in ext4_mb_release_context instead of ext4_mb_use_group_pa. Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx> --- fs/ext4/mballoc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index f24f80ecf318..2bffc93778d5 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -4670,8 +4670,8 @@ ext4_mb_new_inode_pa(struct ext4_allocation_context *ac) pa->pa_len, pa->pa_lstart); trace_ext4_mb_new_inode_pa(ac, pa); - ext4_mb_use_inode_pa(ac, pa); atomic_add(pa->pa_free, &sbi->s_mb_preallocated); + ext4_mb_use_inode_pa(ac, pa); ei = EXT4_I(ac->ac_inode); grp = ext4_get_group_info(sb, ac->ac_b_ex.fe_group); -- 2.30.0
