[PATCH 4.19 146/196] ext4: fix wrong unit use in ext4_mb_find_by_goal

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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>

[ Upstream commit 99c515e3a860576ba90c11acbc1d6488dfca6463 ]

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@xxxxxxxxxxxxxxx>
Reviewed-by: Ojaswin Mujoo <ojaswin@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230603150327.3596033-4-shikemeng@xxxxxxxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 5af5ad53e0ada..5dcc3cad5c7d3 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -1850,8 +1850,7 @@ 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++;
-- 
2.43.0







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