Commit 642e0dc7 authored by Ritesh Harjani (IBM)'s avatar Ritesh Harjani (IBM) Committed by Theodore Ts'o
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ext4: Enable support for ext4 multi-fsblock atomic write using bigalloc 



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: default avatarDarrick J. Wong <djwong@kernel.org>
Co-developed-by: default avatarOjaswin Mujoo <ojaswin@linux.ibm.com>
Signed-off-by: default avatarOjaswin Mujoo <ojaswin@linux.ibm.com>
Signed-off-by: default avatarRitesh Harjani (IBM) <ritesh.list@gmail.com>
Link: https://patch.msgid.link/5e45d7ed24499024b9079436ba6698dae5298e29.1747337952.git.ritesh.list@gmail.com


Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent b86629c2

fs/ext4/super.c

+5 −2
Original line number Diff line number Diff line
@@ -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) {