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ext4: Enable support for ext4 multi-fsblock atomic write using bigalloc

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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.git.ritesh.list@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Ritesh Harjani (IBM)
2025-05-16 01:20:54 +05:30
committed by Theodore Ts'o
parent b86629c2b2
commit 642e0dc73c
1 changed files with 5 additions and 2 deletions
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7
fs/ext4/super.c
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@@ -4436,13 +4436,16 @@ 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;
@@ -4452,7 +4455,7 @@ 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) {