btrfs: introduce ZONED feature flag (7b3d5a90) · Commits · 戴 / test

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:

Anand Jain <anand.jain@oracle.com> Reviewed-by:

Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by:

Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by:

Naohiro Aota <naohiro.aota@wdc.com> Reviewed-by:

David Sterba <dsterba@suse.com> Signed-off-by:

David Sterba <dsterba@suse.com>

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;

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