From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com> mainline inclusion from mainline-v6.15-rc4 commit 642e0dc73c5def8270ff7c55d750ff36a6ea5d10 category: feature bugzilla: https://atomgit.com/src-openeuler/kernel/issues/8862 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- Last couple of patches added the needed support for multi-fsblock atomic writes using bigalloc. This patch ensures that filesystem advertizes the needed atomic write unit min and max values for enabling multi-fsblock atomic write support with bigalloc. Acked-by: Darrick J. Wong <djwong@kernel.org> Co-developed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com> Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> Link: https://patch.msgid.link/5e45d7ed24499024b9079436ba6698dae5298e29.1747337952... Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Long Li <leo.lilong@huawei.com> --- fs/ext4/super.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 8bfa85c57022..2161e8c88215 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -4584,13 +4584,16 @@ static int ext4_handle_clustersize(struct super_block *sb) /* * ext4_atomic_write_init: Initializes filesystem min & max atomic write units. + * With non-bigalloc filesystem awu will be based upon filesystem blocksize + * & bdev awu units. + * With bigalloc it will be based upon bigalloc cluster size & bdev awu units. * @sb: super block - * TODO: Later add support for bigalloc */ static void ext4_atomic_write_init(struct super_block *sb) { struct ext4_sb_info *sbi = EXT4_SB(sb); struct block_device *bdev = sb->s_bdev; + unsigned int clustersize = EXT4_CLUSTER_SIZE(sb); if (!bdev_can_atomic_write(bdev)) return; @@ -4600,7 +4603,7 @@ static void ext4_atomic_write_init(struct super_block *sb) sbi->s_awu_min = max(sb->s_blocksize, bdev_atomic_write_unit_min_bytes(bdev)); - sbi->s_awu_max = min(sb->s_blocksize, + sbi->s_awu_max = min(clustersize, bdev_atomic_write_unit_max_bytes(bdev)); if (sbi->s_awu_min && sbi->s_awu_max && sbi->s_awu_min <= sbi->s_awu_max) { -- 2.52.0