From: Ojaswin Mujoo <ojaswin@linux.ibm.com> mainline inclusion from mainline-v6.12-rc1 commit ff2beee206d23f49d022650122f81285849033e4 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/ICN2MB Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- Although we have checks to make sure s_stripe is a multiple of cluster size, in case we accidentally end up with a scenario where this is not the case, use EXT4_NUM_B2C() so that we don't end up with unexpected cases where EXT4_B2C(stripe) becomes 0. Also make the is_stripe_aligned check in regular_allocator a bit more robust while we are at it. This should ideally have no functional change unless we have a bug somewhere causing (stripe % cluster_size != 0) Reviewed-by: Kemeng Shi <shikemeng@huaweicloud.com> Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com> Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> Link: https://patch.msgid.link/e0c0a3b58a40935a1361f668851d041575861411.1725002410... Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Baokun Li <libaokun1@huawei.com> --- fs/ext4/mballoc.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 19c7a3cfae49..f53aa8814e60 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -2354,7 +2354,7 @@ int ext4_mb_find_by_goal(struct ext4_allocation_context *ac, ex.fe_logical = 0xDEADFA11; /* debug value */ if (max >= ac->ac_g_ex.fe_len && - ac->ac_g_ex.fe_len == EXT4_B2C(sbi, sbi->s_stripe)) { + ac->ac_g_ex.fe_len == EXT4_NUM_B2C(sbi, sbi->s_stripe)) { ext4_fsblk_t start; start = ext4_grp_offs_to_block(ac->ac_sb, &ex); @@ -2551,7 +2551,7 @@ void ext4_mb_scan_aligned(struct ext4_allocation_context *ac, do_div(a, sbi->s_stripe); i = (a * sbi->s_stripe) - first_group_block; - stripe = EXT4_B2C(sbi, sbi->s_stripe); + stripe = EXT4_NUM_B2C(sbi, sbi->s_stripe); i = EXT4_B2C(sbi, i); while (i < EXT4_CLUSTERS_PER_GROUP(sb)) { if (!mb_test_bit(i, bitmap)) { @@ -2936,9 +2936,11 @@ ext4_mb_regular_allocator(struct ext4_allocation_context *ac) if (cr == CR_POWER2_ALIGNED) ext4_mb_simple_scan_group(ac, &e4b); else { - bool is_stripe_aligned = sbi->s_stripe && + bool is_stripe_aligned = + (sbi->s_stripe >= + sbi->s_cluster_ratio) && !(ac->ac_g_ex.fe_len % - EXT4_B2C(sbi, sbi->s_stripe)); + EXT4_NUM_B2C(sbi, sbi->s_stripe)); if ((cr == CR_GOAL_LEN_FAST || cr == CR_BEST_AVAIL_LEN) && @@ -3720,7 +3722,7 @@ int ext4_mb_init(struct super_block *sb) */ if (sbi->s_stripe > 1) { sbi->s_mb_group_prealloc = roundup( - sbi->s_mb_group_prealloc, EXT4_B2C(sbi, sbi->s_stripe)); + sbi->s_mb_group_prealloc, EXT4_NUM_B2C(sbi, sbi->s_stripe)); } sbi->s_mb_nr_global_goals = umin(num_possible_cpus(), -- 2.39.2