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ext4: protect pa->pa_free in ext4_discard_allocated_blocks

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If ext4_mb_mark_diskspace_used fails in ext4_mb_new_blocks, we may
discard pa already in list. Protect pa with pa_lock to avoid race.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Link: https://lore.kernel.org/r/20230303172120.3800725-7-shikemeng@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Kemeng Shi 2023-03-04 01:21:06 +08:00 committed by Theodore Ts'o
parent 1afdc58894
commit 36cb0f52ae
1 changed files with 4 additions and 1 deletions
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5
fs/ext4/mballoc.c
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@ -4267,8 +4267,11 @@ static void ext4_discard_allocated_blocks(struct ext4_allocation_context *ac)
ext4_mb_unload_buddy(&e4b);
return;
}
if (pa->pa_type == MB_INODE_PA)
if (pa->pa_type == MB_INODE_PA) {
spin_lock(&pa->pa_lock);
pa->pa_free += ac->ac_b_ex.fe_len;
spin_unlock(&pa->pa_lock);
}
}
/*