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@xxxxxxxxxxxxxxx>
Reviewed-by: Ojaswin Mujoo <ojaswin@xxxxxxxxxxxxx>
---
fs/ext4/mballoc.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index d6a27e47584a..56f35a25842c 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4266,8 +4266,11 @@ 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);
+ }
}
/*
--
2.30.0
