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ext4: avoid unnecessary pointer dereference in ext4_mb_normalize_request

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Result of EXT4_SB(ac->ac_sb) is already stored in sbi at beginning of
ext4_mb_normalize_request. Use sbi instead of EXT4_SB(ac->ac_sb) to
remove unnecessary pointer dereference.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Link: https://lore.kernel.org/r/20230311170949.1047958-3-shikemeng@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Kemeng Shi 2023-03-12 01:09:49 +08:00 committed by Theodore Ts'o
parent 1221b23501
commit 91a48aaf59
1 changed files with 3 additions and 5 deletions
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8
fs/ext4/mballoc.c
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@ -4049,7 +4049,7 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
size = 8 * 1024 * 1024;
} else {
start_off = (loff_t) ac->ac_o_ex.fe_logical << bsbits;
size = (loff_t) EXT4_C2B(EXT4_SB(ac->ac_sb),
size = (loff_t) EXT4_C2B(sbi,
ac->ac_o_ex.fe_len) << bsbits;
}
size = size >> bsbits;
@ -4094,8 +4094,7 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
continue;
}
pa_end = pa->pa_lstart + EXT4_C2B(EXT4_SB(ac->ac_sb),
pa->pa_len);
pa_end = pa->pa_lstart + EXT4_C2B(sbi, pa->pa_len);
/* PA must not overlap original request */
BUG_ON(!(ac->ac_o_ex.fe_logical >= pa_end ||
@ -4128,8 +4127,7 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
spin_lock(&pa->pa_lock);
if (pa->pa_deleted == 0) {
pa_end = pa->pa_lstart + EXT4_C2B(EXT4_SB(ac->ac_sb),
pa->pa_len);
pa_end = pa->pa_lstart + EXT4_C2B(sbi, pa->pa_len);
BUG_ON(!(start >= pa_end || end <= pa->pa_lstart));
}
spin_unlock(&pa->pa_lock);