Mailing List Archive

[PATCH 4/8] ext4: fix wrong unit use in ext4_mb_find_by_goal
We need start in block unit while fe_start is in cluster unit. Use
ext4_grp_offs_to_block helper to convert fe_start to get start in
block unit.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
---
fs/ext4/mballoc.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 86d978e1f7dc..9a40e165e7d2 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2181,8 +2181,7 @@ int ext4_mb_find_by_goal(struct ext4_allocation_context *ac,
if (max >= ac->ac_g_ex.fe_len && ac->ac_g_ex.fe_len == sbi->s_stripe) {
ext4_fsblk_t start;

- start = ext4_group_first_block_no(ac->ac_sb, e4b->bd_group) +
- ex.fe_start;
+ start = ext4_grp_offs_to_block(ac->ac_sb, &ex);
/* use do_div to get remainder (would be 64-bit modulo) */
if (do_div(start, sbi->s_stripe) == 0) {
ac->ac_found++;
--
2.30.0
Re: [PATCH 4/8] ext4: fix wrong unit use in ext4_mb_find_by_goal [ In reply to ]
On Wed, Mar 22, 2023 at 12:12:16AM +0800, Kemeng Shi wrote:
> We need start in block unit while fe_start is in cluster unit. Use
> ext4_grp_offs_to_block helper to convert fe_start to get start in
> block unit.
>
> Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>

Feel free to add:

Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>

Regards,
ojaswin

> ---
> fs/ext4/mballoc.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index 86d978e1f7dc..9a40e165e7d2 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -2181,8 +2181,7 @@ int ext4_mb_find_by_goal(struct ext4_allocation_context *ac,
> if (max >= ac->ac_g_ex.fe_len && ac->ac_g_ex.fe_len == sbi->s_stripe) {
> ext4_fsblk_t start;
>
> - start = ext4_group_first_block_no(ac->ac_sb, e4b->bd_group) +
> - ex.fe_start;
> + start = ext4_grp_offs_to_block(ac->ac_sb, &ex);
> /* use do_div to get remainder (would be 64-bit modulo) */
> if (do_div(start, sbi->s_stripe) == 0) {
> ac->ac_found++;
> --
> 2.30.0
>