[RFC 03/11] ext4: mballoc: Fix getting the right group desc in ext4_mb_prefetch_fini

Ojaswin Mujoo
2023-01-27T12:38:11Z

group descriptor and group info are not of the same group in
ext4_mb_prefetch_fini(). This problem was found during code
review/walkthrough and seems like a bug, so fix it.

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
---
fs/ext4/mballoc.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 572e79a698d4..8b22cc07b054 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2569,14 +2569,14 @@ ext4_group_t ext4_mb_prefetch(struct super_block *sb, ext4_group_t group,
void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
unsigned int nr)
{
- while (nr-- > 0) {
- struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group,
- NULL);
- struct ext4_group_info *grp = ext4_get_group_info(sb, group);
+ struct ext4_group_desc *gdp;
+ struct ext4_group_info *grp;

+ while (nr-- > 0) {
if (!group)
group = ext4_get_groups_count(sb);
group--;
+ gdp = ext4_get_group_desc(sb, group, NULL);
grp = ext4_get_group_info(sb, group);

if (EXT4_MB_GRP_NEED_INIT(grp) &&
--
2.31.1