Commit ee129330 authored by Johannes Thumshirn's avatar Johannes Thumshirn Committed by David Sterba
Browse files

btrfs: add raid stripe tree definitions 



Add definitions for the raid stripe tree. This tree will hold information
about the on-disk layout of the stripes in a RAID set.

Each stripe extent has a 1:1 relationship with an on-disk extent item and
is doing the logical to per-drive physical address translation for the
extent item in question.

Signed-off-by: default avatarJohannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 6d3a6194

fs/btrfs/accessors.h

+8 −0
Original line number Diff line number Diff line
@@ -306,6 +306,14 @@ BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32); 
BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);

BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);



BTRFS_SETGET_FUNCS(stripe_extent_encoding, struct btrfs_stripe_extent, encoding, 8);

BTRFS_SETGET_FUNCS(raid_stride_devid, struct btrfs_raid_stride, devid, 64);

BTRFS_SETGET_FUNCS(raid_stride_physical, struct btrfs_raid_stride, physical, 64);

BTRFS_SETGET_STACK_FUNCS(stack_stripe_extent_encoding,

			 struct btrfs_stripe_extent, encoding, 8);

BTRFS_SETGET_STACK_FUNCS(stack_raid_stride_devid, struct btrfs_raid_stride, devid, 64);

BTRFS_SETGET_STACK_FUNCS(stack_raid_stride_physical, struct btrfs_raid_stride, physical, 64);



/* struct btrfs_dev_extent */

BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent, chunk_tree, 64);

BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,

fs/btrfs/locking.c

+1 −0
Original line number Diff line number Diff line
@@ -74,6 +74,7 @@ static struct btrfs_lockdep_keyset { 
	{ .id = BTRFS_UUID_TREE_OBJECTID,	DEFINE_NAME("uuid")	},

	{ .id = BTRFS_FREE_SPACE_TREE_OBJECTID,	DEFINE_NAME("free-space") },

	{ .id = BTRFS_BLOCK_GROUP_TREE_OBJECTID, DEFINE_NAME("block-group") },

	{ .id = BTRFS_RAID_STRIPE_TREE_OBJECTID, DEFINE_NAME("raid-stripe") },

	{ .id = 0,				DEFINE_NAME("tree")	},

};

include/uapi/linux/btrfs_tree.h

+29 −0
Original line number Diff line number Diff line
@@ -73,6 +73,9 @@ 
/* Holds the block group items for extent tree v2. */

#define BTRFS_BLOCK_GROUP_TREE_OBJECTID 11ULL



/* Tracks RAID stripes in block groups. */

#define BTRFS_RAID_STRIPE_TREE_OBJECTID 12ULL



/* device stats in the device tree */

#define BTRFS_DEV_STATS_OBJECTID 0ULL
@@ -261,6 +264,8 @@ 
#define BTRFS_DEV_ITEM_KEY	216

#define BTRFS_CHUNK_ITEM_KEY	228



#define BTRFS_RAID_STRIPE_KEY	230



/*

 * Records the overall state of the qgroups.

 * There's only one instance of this key present,
@@ -719,6 +724,30 @@ struct btrfs_free_space_header { 
	__le64 num_bitmaps;

} __attribute__ ((__packed__));



struct btrfs_raid_stride {

	/* The id of device this raid extent lives on. */

	__le64 devid;

	/* The physical location on disk. */

	__le64 physical;

} __attribute__ ((__packed__));



/* The stripe_extent::encoding, 1:1 mapping of enum btrfs_raid_types. */

#define BTRFS_STRIPE_RAID0	1

#define BTRFS_STRIPE_RAID1	2

#define BTRFS_STRIPE_DUP	3

#define BTRFS_STRIPE_RAID10	4

#define BTRFS_STRIPE_RAID5	5

#define BTRFS_STRIPE_RAID6	6

#define BTRFS_STRIPE_RAID1C3	7

#define BTRFS_STRIPE_RAID1C4	8



struct btrfs_stripe_extent {

	__u8 encoding;

	__u8 reserved[7];

	/* An array of raid strides this stripe is composed of. */

	struct btrfs_raid_stride strides[];

} __attribute__ ((__packed__));



#define BTRFS_HEADER_FLAG_WRITTEN	(1ULL << 0)

#define BTRFS_HEADER_FLAG_RELOC		(1ULL << 1)