Commit 7b3d5a90 authored by Naohiro Aota's avatar Naohiro Aota Committed by David Sterba
Browse files

btrfs: introduce ZONED feature flag 



This patch introduces the ZONED incompat flag. The flag indicates that
the volume management will satisfy the constraints imposed by
host-managed zoned block devices (aligned chunk allocation, append-only
updates, reset zone after filled).

As the zoned support will happen incrementally due to enhancing some
core infrastructure like super block writes, tree-log, raid support, the
feature will appear in sysfs only on debug builds. It will be enabled
once the support is feature complete and applications can reliably check
whether zoned support is present or not.

Reviewed-by: default avatarAnand Jain <anand.jain@oracle.com>
Reviewed-by: default avatarJohannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: default avatarDamien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: default avatarNaohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent a2633b6a

fs/btrfs/sysfs.c

+7 −0
Original line number Diff line number Diff line
@@ -263,6 +263,10 @@ BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 
BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID);

BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE);

BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34);

/* Remove once support for zoned allocation is feature complete */

#ifdef CONFIG_BTRFS_DEBUG

BTRFS_FEAT_ATTR_INCOMPAT(zoned, ZONED);

#endif



static struct attribute *btrfs_supported_feature_attrs[] = {

	BTRFS_FEAT_ATTR_PTR(mixed_backref),
@@ -278,6 +282,9 @@ static struct attribute *btrfs_supported_feature_attrs[] = { 
	BTRFS_FEAT_ATTR_PTR(metadata_uuid),

	BTRFS_FEAT_ATTR_PTR(free_space_tree),

	BTRFS_FEAT_ATTR_PTR(raid1c34),

#ifdef CONFIG_BTRFS_DEBUG

	BTRFS_FEAT_ATTR_PTR(zoned),

#endif

	NULL

};

include/uapi/linux/btrfs.h

+1 −0
Original line number Diff line number Diff line
@@ -307,6 +307,7 @@ struct btrfs_ioctl_fs_info_args { 
#define BTRFS_FEATURE_INCOMPAT_NO_HOLES		(1ULL << 9)

#define BTRFS_FEATURE_INCOMPAT_METADATA_UUID	(1ULL << 10)

#define BTRFS_FEATURE_INCOMPAT_RAID1C34		(1ULL << 11)

#define BTRFS_FEATURE_INCOMPAT_ZONED		(1ULL << 12)



struct btrfs_ioctl_feature_flags {

	__u64 compat_flags;