#include <asm/kmap_types.h>
#include <linux/pagemap.h>
#include <linux/btrfs.h>
+#include <linux/btrfs_tree.h>
#include <linux/workqueue.h>
#include <linux/security.h>
#include <linux/sizes.h>
#define BTRFS_COMPAT_EXTENT_TREE_V0
-/* holds pointers to all of the tree roots */
-#define BTRFS_ROOT_TREE_OBJECTID 1ULL
-
-/* stores information about which extents are in use, and reference counts */
-#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
-
-/*
- * chunk tree stores translations from logical -> physical block numbering
- * the super block points to the chunk tree
- */
-#define BTRFS_CHUNK_TREE_OBJECTID 3ULL
-
-/*
- * stores information about which areas of a given device are in use.
- * one per device. The tree of tree roots points to the device tree
- */
-#define BTRFS_DEV_TREE_OBJECTID 4ULL
-
-/* one per subvolume, storing files and directories */
-#define BTRFS_FS_TREE_OBJECTID 5ULL
-
-/* directory objectid inside the root tree */
-#define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
-
-/* holds checksums of all the data extents */
-#define BTRFS_CSUM_TREE_OBJECTID 7ULL
-
-/* holds quota configuration and tracking */
-#define BTRFS_QUOTA_TREE_OBJECTID 8ULL
-
-/* for storing items that use the BTRFS_UUID_KEY* types */
-#define BTRFS_UUID_TREE_OBJECTID 9ULL
-
-/* tracks free space in block groups. */
-#define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL
-
-/* device stats in the device tree */
-#define BTRFS_DEV_STATS_OBJECTID 0ULL
-
-/* for storing balance parameters in the root tree */
-#define BTRFS_BALANCE_OBJECTID -4ULL
-
-/* orhpan objectid for tracking unlinked/truncated files */
-#define BTRFS_ORPHAN_OBJECTID -5ULL
-
-/* does write ahead logging to speed up fsyncs */
-#define BTRFS_TREE_LOG_OBJECTID -6ULL
-#define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
-
-/* for space balancing */
-#define BTRFS_TREE_RELOC_OBJECTID -8ULL
-#define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
-
-/*
- * extent checksums all have this objectid
- * this allows them to share the logging tree
- * for fsyncs
- */
-#define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
-
-/* For storing free space cache */
-#define BTRFS_FREE_SPACE_OBJECTID -11ULL
-
-/*
- * The inode number assigned to the special inode for storing
- * free ino cache
- */
-#define BTRFS_FREE_INO_OBJECTID -12ULL
-
-/* dummy objectid represents multiple objectids */
-#define BTRFS_MULTIPLE_OBJECTIDS -255ULL
-
-/*
- * All files have objectids in this range.
- */
-#define BTRFS_FIRST_FREE_OBJECTID 256ULL
-#define BTRFS_LAST_FREE_OBJECTID -256ULL
-#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
-
-
-/*
- * the device items go into the chunk tree. The key is in the form
- * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
- */
-#define BTRFS_DEV_ITEMS_OBJECTID 1ULL
-
-#define BTRFS_BTREE_INODE_OBJECTID 1
-
-#define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
-
-#define BTRFS_DEV_REPLACE_DEVID 0ULL
-
/*
* the max metadata block size. This limit is somewhat artificial,
* but the memmove costs go through the roof for larger blocks.
*/
#define BTRFS_LINK_MAX 65535U
-/* 32 bytes in various csum fields */
-#define BTRFS_CSUM_SIZE 32
-
-/* csum types */
-#define BTRFS_CSUM_TYPE_CRC32 0
-
static const int btrfs_csum_sizes[] = { 4 };
/* four bytes for CRC32 */
/* spefic to btrfs_map_block(), therefore not in include/linux/blk_types.h */
#define REQ_GET_READ_MIRRORS (1 << 30)
-#define BTRFS_FT_UNKNOWN 0
-#define BTRFS_FT_REG_FILE 1
-#define BTRFS_FT_DIR 2
-#define BTRFS_FT_CHRDEV 3
-#define BTRFS_FT_BLKDEV 4
-#define BTRFS_FT_FIFO 5
-#define BTRFS_FT_SOCK 6
-#define BTRFS_FT_SYMLINK 7
-#define BTRFS_FT_XATTR 8
-#define BTRFS_FT_MAX 9
-
/* ioprio of readahead is set to idle */
#define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
#define BTRFS_MAX_EXTENT_SIZE SZ_128M
-/*
- * The key defines the order in the tree, and so it also defines (optimal)
- * block layout.
- *
- * objectid corresponds to the inode number.
- *
- * type tells us things about the object, and is a kind of stream selector.
- * so for a given inode, keys with type of 1 might refer to the inode data,
- * type of 2 may point to file data in the btree and type == 3 may point to
- * extents.
- *
- * offset is the starting byte offset for this key in the stream.
- *
- * btrfs_disk_key is in disk byte order. struct btrfs_key is always
- * in cpu native order. Otherwise they are identical and their sizes
- * should be the same (ie both packed)
- */
-struct btrfs_disk_key {
- __le64 objectid;
- u8 type;
- __le64 offset;
-} __attribute__ ((__packed__));
-
-struct btrfs_key {
- u64 objectid;
- u8 type;
- u64 offset;
-} __attribute__ ((__packed__));
-
struct btrfs_mapping_tree {
struct extent_map_tree map_tree;
};
-struct btrfs_dev_item {
- /* the internal btrfs device id */
- __le64 devid;
-
- /* size of the device */
- __le64 total_bytes;
-
- /* bytes used */
- __le64 bytes_used;
-
- /* optimal io alignment for this device */
- __le32 io_align;
-
- /* optimal io width for this device */
- __le32 io_width;
-
- /* minimal io size for this device */
- __le32 sector_size;
-
- /* type and info about this device */
- __le64 type;
-
- /* expected generation for this device */
- __le64 generation;
-
- /*
- * starting byte of this partition on the device,
- * to allow for stripe alignment in the future
- */
- __le64 start_offset;
-
- /* grouping information for allocation decisions */
- __le32 dev_group;
-
- /* seek speed 0-100 where 100 is fastest */
- u8 seek_speed;
-
- /* bandwidth 0-100 where 100 is fastest */
- u8 bandwidth;
-
- /* btrfs generated uuid for this device */
- u8 uuid[BTRFS_UUID_SIZE];
-
- /* uuid of FS who owns this device */
- u8 fsid[BTRFS_UUID_SIZE];
-} __attribute__ ((__packed__));
-
-struct btrfs_stripe {
- __le64 devid;
- __le64 offset;
- u8 dev_uuid[BTRFS_UUID_SIZE];
-} __attribute__ ((__packed__));
-
-struct btrfs_chunk {
- /* size of this chunk in bytes */
- __le64 length;
-
- /* objectid of the root referencing this chunk */
- __le64 owner;
-
- __le64 stripe_len;
- __le64 type;
-
- /* optimal io alignment for this chunk */
- __le32 io_align;
-
- /* optimal io width for this chunk */
- __le32 io_width;
-
- /* minimal io size for this chunk */
- __le32 sector_size;
-
- /* 2^16 stripes is quite a lot, a second limit is the size of a single
- * item in the btree
- */
- __le16 num_stripes;
-
- /* sub stripes only matter for raid10 */
- __le16 sub_stripes;
- struct btrfs_stripe stripe;
- /* additional stripes go here */
-} __attribute__ ((__packed__));
-
-#define BTRFS_FREE_SPACE_EXTENT 1
-#define BTRFS_FREE_SPACE_BITMAP 2
-
-struct btrfs_free_space_entry {
- __le64 offset;
- __le64 bytes;
- u8 type;
-} __attribute__ ((__packed__));
-
-struct btrfs_free_space_header {
- struct btrfs_disk_key location;
- __le64 generation;
- __le64 num_entries;
- __le64 num_bitmaps;
-} __attribute__ ((__packed__));
-
static inline unsigned long btrfs_chunk_item_size(int num_stripes)
{
BUG_ON(num_stripes == 0);
sizeof(struct btrfs_stripe) * (num_stripes - 1);
}
-#define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
-#define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
-
/*
* File system states
*/
#define BTRFS_FS_STATE_TRANS_ABORTED 2
#define BTRFS_FS_STATE_DEV_REPLACING 3
-/* Super block flags */
-/* Errors detected */
-#define BTRFS_SUPER_FLAG_ERROR (1ULL << 2)
-
-#define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
-#define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
-
#define BTRFS_BACKREF_REV_MAX 256
#define BTRFS_BACKREF_REV_SHIFT 56
#define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
* room to translate 14 chunks with 3 stripes each.
*/
#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
-#define BTRFS_LABEL_SIZE 256
/*
* just in case we somehow lose the roots and are not able to mount,
* Compat flags that we support. If any incompat flags are set other than the
* ones specified below then we will fail to mount
*/
-#define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE (1ULL << 0)
-
-#define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
-#define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
-#define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
-#define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
-/*
- * some patches floated around with a second compression method
- * lets save that incompat here for when they do get in
- * Note we don't actually support it, we're just reserving the
- * number
- */
-#define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2 (1ULL << 4)
-
-/*
- * older kernels tried to do bigger metadata blocks, but the
- * code was pretty buggy. Lets not let them try anymore.
- */
-#define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5)
-
-#define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF (1ULL << 6)
-#define BTRFS_FEATURE_INCOMPAT_RAID56 (1ULL << 7)
-#define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8)
-#define BTRFS_FEATURE_INCOMPAT_NO_HOLES (1ULL << 9)
-
#define BTRFS_FEATURE_COMPAT_SUPP 0ULL
#define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL
#define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL
unsigned int need_commit_sem:1;
unsigned int skip_release_on_error:1;
};
-
-/*
- * items in the extent btree are used to record the objectid of the
- * owner of the block and the number of references
- */
-
-struct btrfs_extent_item {
- __le64 refs;
- __le64 generation;
- __le64 flags;
-} __attribute__ ((__packed__));
-
-struct btrfs_extent_item_v0 {
- __le32 refs;
-} __attribute__ ((__packed__));
-
#define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
sizeof(struct btrfs_item))
-
-#define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
-#define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
-
-/* following flags only apply to tree blocks */
-
-/* use full backrefs for extent pointers in the block */
-#define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
-
-/*
- * this flag is only used internally by scrub and may be changed at any time
- * it is only declared here to avoid collisions
- */
-#define BTRFS_EXTENT_FLAG_SUPER (1ULL << 48)
-
-struct btrfs_tree_block_info {
- struct btrfs_disk_key key;
- u8 level;
-} __attribute__ ((__packed__));
-
-struct btrfs_extent_data_ref {
- __le64 root;
- __le64 objectid;
- __le64 offset;
- __le32 count;
-} __attribute__ ((__packed__));
-
-struct btrfs_shared_data_ref {
- __le32 count;
-} __attribute__ ((__packed__));
-
-struct btrfs_extent_inline_ref {
- u8 type;
- __le64 offset;
-} __attribute__ ((__packed__));
-
-/* old style backrefs item */
-struct btrfs_extent_ref_v0 {
- __le64 root;
- __le64 generation;
- __le64 objectid;
- __le32 count;
-} __attribute__ ((__packed__));
-
-
-/* dev extents record free space on individual devices. The owner
- * field points back to the chunk allocation mapping tree that allocated
- * the extent. The chunk tree uuid field is a way to double check the owner
- */
-struct btrfs_dev_extent {
- __le64 chunk_tree;
- __le64 chunk_objectid;
- __le64 chunk_offset;
- __le64 length;
- u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
-} __attribute__ ((__packed__));
-
-struct btrfs_inode_ref {
- __le64 index;
- __le16 name_len;
- /* name goes here */
-} __attribute__ ((__packed__));
-
-struct btrfs_inode_extref {
- __le64 parent_objectid;
- __le64 index;
- __le16 name_len;
- __u8 name[0];
- /* name goes here */
-} __attribute__ ((__packed__));
-
-struct btrfs_timespec {
- __le64 sec;
- __le32 nsec;
-} __attribute__ ((__packed__));
-
-struct btrfs_inode_item {
- /* nfs style generation number */
- __le64 generation;
- /* transid that last touched this inode */
- __le64 transid;
- __le64 size;
- __le64 nbytes;
- __le64 block_group;
- __le32 nlink;
- __le32 uid;
- __le32 gid;
- __le32 mode;
- __le64 rdev;
- __le64 flags;
-
- /* modification sequence number for NFS */
- __le64 sequence;
-
- /*
- * a little future expansion, for more than this we can
- * just grow the inode item and version it
- */
- __le64 reserved[4];
- struct btrfs_timespec atime;
- struct btrfs_timespec ctime;
- struct btrfs_timespec mtime;
- struct btrfs_timespec otime;
-} __attribute__ ((__packed__));
-
-struct btrfs_dir_log_item {
- __le64 end;
-} __attribute__ ((__packed__));
-
-struct btrfs_dir_item {
- struct btrfs_disk_key location;
- __le64 transid;
- __le16 data_len;
- __le16 name_len;
- u8 type;
-} __attribute__ ((__packed__));
-
-#define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
-
-/*
- * Internal in-memory flag that a subvolume has been marked for deletion but
- * still visible as a directory
- */
-#define BTRFS_ROOT_SUBVOL_DEAD (1ULL << 48)
-
-struct btrfs_root_item {
- struct btrfs_inode_item inode;
- __le64 generation;
- __le64 root_dirid;
- __le64 bytenr;
- __le64 byte_limit;
- __le64 bytes_used;
- __le64 last_snapshot;
- __le64 flags;
- __le32 refs;
- struct btrfs_disk_key drop_progress;
- u8 drop_level;
- u8 level;
-
- /*
- * The following fields appear after subvol_uuids+subvol_times
- * were introduced.
- */
-
- /*
- * This generation number is used to test if the new fields are valid
- * and up to date while reading the root item. Every time the root item
- * is written out, the "generation" field is copied into this field. If
- * anyone ever mounted the fs with an older kernel, we will have
- * mismatching generation values here and thus must invalidate the
- * new fields. See btrfs_update_root and btrfs_find_last_root for
- * details.
- * the offset of generation_v2 is also used as the start for the memset
- * when invalidating the fields.
- */
- __le64 generation_v2;
- u8 uuid[BTRFS_UUID_SIZE];
- u8 parent_uuid[BTRFS_UUID_SIZE];
- u8 received_uuid[BTRFS_UUID_SIZE];
- __le64 ctransid; /* updated when an inode changes */
- __le64 otransid; /* trans when created */
- __le64 stransid; /* trans when sent. non-zero for received subvol */
- __le64 rtransid; /* trans when received. non-zero for received subvol */
- struct btrfs_timespec ctime;
- struct btrfs_timespec otime;
- struct btrfs_timespec stime;
- struct btrfs_timespec rtime;
- __le64 reserved[8]; /* for future */
-} __attribute__ ((__packed__));
-
-/*
- * this is used for both forward and backward root refs
- */
-struct btrfs_root_ref {
- __le64 dirid;
- __le64 sequence;
- __le16 name_len;
-} __attribute__ ((__packed__));
-
-struct btrfs_disk_balance_args {
- /*
- * profiles to operate on, single is denoted by
- * BTRFS_AVAIL_ALLOC_BIT_SINGLE
- */
- __le64 profiles;
-
- /*
- * usage filter
- * BTRFS_BALANCE_ARGS_USAGE with a single value means '0..N'
- * BTRFS_BALANCE_ARGS_USAGE_RANGE - range syntax, min..max
- */
- union {
- __le64 usage;
- struct {
- __le32 usage_min;
- __le32 usage_max;
- };
- };
-
- /* devid filter */
- __le64 devid;
-
- /* devid subset filter [pstart..pend) */
- __le64 pstart;
- __le64 pend;
-
- /* btrfs virtual address space subset filter [vstart..vend) */
- __le64 vstart;
- __le64 vend;
-
- /*
- * profile to convert to, single is denoted by
- * BTRFS_AVAIL_ALLOC_BIT_SINGLE
- */
- __le64 target;
-
- /* BTRFS_BALANCE_ARGS_* */
- __le64 flags;
-
- /*
- * BTRFS_BALANCE_ARGS_LIMIT with value 'limit'
- * BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum
- * and maximum
- */
- union {
- __le64 limit;
- struct {
- __le32 limit_min;
- __le32 limit_max;
- };
- };
-
- /*
- * Process chunks that cross stripes_min..stripes_max devices,
- * BTRFS_BALANCE_ARGS_STRIPES_RANGE
- */
- __le32 stripes_min;
- __le32 stripes_max;
-
- __le64 unused[6];
-} __attribute__ ((__packed__));
-
-/*
- * store balance parameters to disk so that balance can be properly
- * resumed after crash or unmount
- */
-struct btrfs_balance_item {
- /* BTRFS_BALANCE_* */
- __le64 flags;
-
- struct btrfs_disk_balance_args data;
- struct btrfs_disk_balance_args meta;
- struct btrfs_disk_balance_args sys;
-
- __le64 unused[4];
-} __attribute__ ((__packed__));
-
-#define BTRFS_FILE_EXTENT_INLINE 0
-#define BTRFS_FILE_EXTENT_REG 1
-#define BTRFS_FILE_EXTENT_PREALLOC 2
-
-struct btrfs_file_extent_item {
- /*
- * transaction id that created this extent
- */
- __le64 generation;
- /*
- * max number of bytes to hold this extent in ram
- * when we split a compressed extent we can't know how big
- * each of the resulting pieces will be. So, this is
- * an upper limit on the size of the extent in ram instead of
- * an exact limit.
- */
- __le64 ram_bytes;
-
- /*
- * 32 bits for the various ways we might encode the data,
- * including compression and encryption. If any of these
- * are set to something a given disk format doesn't understand
- * it is treated like an incompat flag for reading and writing,
- * but not for stat.
- */
- u8 compression;
- u8 encryption;
- __le16 other_encoding; /* spare for later use */
-
- /* are we inline data or a real extent? */
- u8 type;
-
- /*
- * disk space consumed by the extent, checksum blocks are included
- * in these numbers
- *
- * At this offset in the structure, the inline extent data start.
- */
- __le64 disk_bytenr;
- __le64 disk_num_bytes;
- /*
- * the logical offset in file blocks (no csums)
- * this extent record is for. This allows a file extent to point
- * into the middle of an existing extent on disk, sharing it
- * between two snapshots (useful if some bytes in the middle of the
- * extent have changed
- */
- __le64 offset;
- /*
- * the logical number of file blocks (no csums included). This
- * always reflects the size uncompressed and without encoding.
- */
- __le64 num_bytes;
-
-} __attribute__ ((__packed__));
-
-struct btrfs_csum_item {
- u8 csum;
-} __attribute__ ((__packed__));
-
-struct btrfs_dev_stats_item {
- /*
- * grow this item struct at the end for future enhancements and keep
- * the existing values unchanged
- */
- __le64 values[BTRFS_DEV_STAT_VALUES_MAX];
-} __attribute__ ((__packed__));
-
-#define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS 0
-#define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID 1
-#define BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED 0
-#define BTRFS_DEV_REPLACE_ITEM_STATE_STARTED 1
-#define BTRFS_DEV_REPLACE_ITEM_STATE_SUSPENDED 2
-#define BTRFS_DEV_REPLACE_ITEM_STATE_FINISHED 3
-#define BTRFS_DEV_REPLACE_ITEM_STATE_CANCELED 4
-
struct btrfs_dev_replace {
u64 replace_state; /* see #define above */
u64 time_started; /* seconds since 1-Jan-1970 */
struct btrfs_scrub_progress scrub_progress;
};
-struct btrfs_dev_replace_item {
- /*
- * grow this item struct at the end for future enhancements and keep
- * the existing values unchanged
- */
- __le64 src_devid;
- __le64 cursor_left;
- __le64 cursor_right;
- __le64 cont_reading_from_srcdev_mode;
-
- __le64 replace_state;
- __le64 time_started;
- __le64 time_stopped;
- __le64 num_write_errors;
- __le64 num_uncorrectable_read_errors;
-} __attribute__ ((__packed__));
-
-/* different types of block groups (and chunks) */
-#define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
-#define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
-#define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2)
-#define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3)
-#define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
-#define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
-#define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
-#define BTRFS_BLOCK_GROUP_RAID5 (1ULL << 7)
-#define BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8)
-#define BTRFS_BLOCK_GROUP_RESERVED (BTRFS_AVAIL_ALLOC_BIT_SINGLE | \
- BTRFS_SPACE_INFO_GLOBAL_RSV)
-
-enum btrfs_raid_types {
- BTRFS_RAID_RAID10,
- BTRFS_RAID_RAID1,
- BTRFS_RAID_DUP,
- BTRFS_RAID_RAID0,
- BTRFS_RAID_SINGLE,
- BTRFS_RAID_RAID5,
- BTRFS_RAID_RAID6,
- BTRFS_NR_RAID_TYPES
-};
-
-#define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \
- BTRFS_BLOCK_GROUP_SYSTEM | \
- BTRFS_BLOCK_GROUP_METADATA)
-
-#define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
- BTRFS_BLOCK_GROUP_RAID1 | \
- BTRFS_BLOCK_GROUP_RAID5 | \
- BTRFS_BLOCK_GROUP_RAID6 | \
- BTRFS_BLOCK_GROUP_DUP | \
- BTRFS_BLOCK_GROUP_RAID10)
-#define BTRFS_BLOCK_GROUP_RAID56_MASK (BTRFS_BLOCK_GROUP_RAID5 | \
- BTRFS_BLOCK_GROUP_RAID6)
-
-/*
- * We need a bit for restriper to be able to tell when chunks of type
- * SINGLE are available. This "extended" profile format is used in
- * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
- * (on-disk). The corresponding on-disk bit in chunk.type is reserved
- * to avoid remappings between two formats in future.
- */
-#define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
-
-/*
- * A fake block group type that is used to communicate global block reserve
- * size to userspace via the SPACE_INFO ioctl.
- */
-#define BTRFS_SPACE_INFO_GLOBAL_RSV (1ULL << 49)
-
-#define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \
- BTRFS_AVAIL_ALLOC_BIT_SINGLE)
-
-static inline u64 chunk_to_extended(u64 flags)
-{
- if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)
- flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
-
- return flags;
-}
-static inline u64 extended_to_chunk(u64 flags)
-{
- return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
-}
-
-struct btrfs_block_group_item {
- __le64 used;
- __le64 chunk_objectid;
- __le64 flags;
-} __attribute__ ((__packed__));
-
-struct btrfs_free_space_info {
- __le32 extent_count;
- __le32 flags;
-} __attribute__ ((__packed__));
-
-#define BTRFS_FREE_SPACE_USING_BITMAPS (1ULL << 0)
-
-#define BTRFS_QGROUP_LEVEL_SHIFT 48
-static inline u64 btrfs_qgroup_level(u64 qgroupid)
-{
- return qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT;
-}
-
-/*
- * is subvolume quota turned on?
- */
-#define BTRFS_QGROUP_STATUS_FLAG_ON (1ULL << 0)
-/*
- * RESCAN is set during the initialization phase
- */
-#define BTRFS_QGROUP_STATUS_FLAG_RESCAN (1ULL << 1)
-/*
- * Some qgroup entries are known to be out of date,
- * either because the configuration has changed in a way that
- * makes a rescan necessary, or because the fs has been mounted
- * with a non-qgroup-aware version.
- * Turning qouta off and on again makes it inconsistent, too.
- */
-#define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1ULL << 2)
-
-#define BTRFS_QGROUP_STATUS_VERSION 1
-
-struct btrfs_qgroup_status_item {
- __le64 version;
- /*
- * the generation is updated during every commit. As older
- * versions of btrfs are not aware of qgroups, it will be
- * possible to detect inconsistencies by checking the
- * generation on mount time
- */
- __le64 generation;
-
- /* flag definitions see above */
- __le64 flags;
-
- /*
- * only used during scanning to record the progress
- * of the scan. It contains a logical address
- */
- __le64 rescan;
-} __attribute__ ((__packed__));
-
-struct btrfs_qgroup_info_item {
- __le64 generation;
- __le64 rfer;
- __le64 rfer_cmpr;
- __le64 excl;
- __le64 excl_cmpr;
-} __attribute__ ((__packed__));
-
-/* flags definition for qgroup limits */
-#define BTRFS_QGROUP_LIMIT_MAX_RFER (1ULL << 0)
-#define BTRFS_QGROUP_LIMIT_MAX_EXCL (1ULL << 1)
-#define BTRFS_QGROUP_LIMIT_RSV_RFER (1ULL << 2)
-#define BTRFS_QGROUP_LIMIT_RSV_EXCL (1ULL << 3)
-#define BTRFS_QGROUP_LIMIT_RFER_CMPR (1ULL << 4)
-#define BTRFS_QGROUP_LIMIT_EXCL_CMPR (1ULL << 5)
-
-struct btrfs_qgroup_limit_item {
- /*
- * only updated when any of the other values change
- */
- __le64 flags;
- __le64 max_rfer;
- __le64 max_excl;
- __le64 rsv_rfer;
- __le64 rsv_excl;
-} __attribute__ ((__packed__));
-
/* For raid type sysfs entries */
struct raid_kobject {
int raid_type;
atomic_t qgroup_meta_rsv;
};
-struct btrfs_ioctl_defrag_range_args {
- /* start of the defrag operation */
- __u64 start;
-
- /* number of bytes to defrag, use (u64)-1 to say all */
- __u64 len;
-
- /*
- * flags for the operation, which can include turning
- * on compression for this one defrag
- */
- __u64 flags;
-
- /*
- * any extent bigger than this will be considered
- * already defragged. Use 0 to take the kernel default
- * Use 1 to say every single extent must be rewritten
- */
- __u32 extent_thresh;
-
- /*
- * which compression method to use if turning on compression
- * for this defrag operation. If unspecified, zlib will
- * be used
- */
- __u32 compress_type;
-
- /* spare for later */
- __u32 unused[4];
-};
-
-
-/*
- * inode items have the data typically returned from stat and store other
- * info about object characteristics. There is one for every file and dir in
- * the FS
- */
-#define BTRFS_INODE_ITEM_KEY 1
-#define BTRFS_INODE_REF_KEY 12
-#define BTRFS_INODE_EXTREF_KEY 13
-#define BTRFS_XATTR_ITEM_KEY 24
-#define BTRFS_ORPHAN_ITEM_KEY 48
-/* reserve 2-15 close to the inode for later flexibility */
-
-/*
- * dir items are the name -> inode pointers in a directory. There is one
- * for every name in a directory.
- */
-#define BTRFS_DIR_LOG_ITEM_KEY 60
-#define BTRFS_DIR_LOG_INDEX_KEY 72
-#define BTRFS_DIR_ITEM_KEY 84
-#define BTRFS_DIR_INDEX_KEY 96
-/*
- * extent data is for file data
- */
-#define BTRFS_EXTENT_DATA_KEY 108
-
-/*
- * extent csums are stored in a separate tree and hold csums for
- * an entire extent on disk.
- */
-#define BTRFS_EXTENT_CSUM_KEY 128
-
-/*
- * root items point to tree roots. They are typically in the root
- * tree used by the super block to find all the other trees
- */
-#define BTRFS_ROOT_ITEM_KEY 132
-
-/*
- * root backrefs tie subvols and snapshots to the directory entries that
- * reference them
- */
-#define BTRFS_ROOT_BACKREF_KEY 144
-
-/*
- * root refs make a fast index for listing all of the snapshots and
- * subvolumes referenced by a given root. They point directly to the
- * directory item in the root that references the subvol
- */
-#define BTRFS_ROOT_REF_KEY 156
-
-/*
- * extent items are in the extent map tree. These record which blocks
- * are used, and how many references there are to each block
- */
-#define BTRFS_EXTENT_ITEM_KEY 168
-
-/*
- * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
- * the length, so we save the level in key->offset instead of the length.
- */
-#define BTRFS_METADATA_ITEM_KEY 169
-
-#define BTRFS_TREE_BLOCK_REF_KEY 176
-
-#define BTRFS_EXTENT_DATA_REF_KEY 178
-
-#define BTRFS_EXTENT_REF_V0_KEY 180
-
-#define BTRFS_SHARED_BLOCK_REF_KEY 182
-
-#define BTRFS_SHARED_DATA_REF_KEY 184
-
-/*
- * block groups give us hints into the extent allocation trees. Which
- * blocks are free etc etc
- */
-#define BTRFS_BLOCK_GROUP_ITEM_KEY 192
-
-/*
- * Every block group is represented in the free space tree by a free space info
- * item, which stores some accounting information. It is keyed on
- * (block_group_start, FREE_SPACE_INFO, block_group_length).
- */
-#define BTRFS_FREE_SPACE_INFO_KEY 198
-
-/*
- * A free space extent tracks an extent of space that is free in a block group.
- * It is keyed on (start, FREE_SPACE_EXTENT, length).
- */
-#define BTRFS_FREE_SPACE_EXTENT_KEY 199
-
-/*
- * When a block group becomes very fragmented, we convert it to use bitmaps
- * instead of extents. A free space bitmap is keyed on
- * (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with
- * (length / sectorsize) bits.
- */
-#define BTRFS_FREE_SPACE_BITMAP_KEY 200
-
-#define BTRFS_DEV_EXTENT_KEY 204
-#define BTRFS_DEV_ITEM_KEY 216
-#define BTRFS_CHUNK_ITEM_KEY 228
-
-/*
- * Records the overall state of the qgroups.
- * There's only one instance of this key present,
- * (0, BTRFS_QGROUP_STATUS_KEY, 0)
- */
-#define BTRFS_QGROUP_STATUS_KEY 240
-/*
- * Records the currently used space of the qgroup.
- * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
- */
-#define BTRFS_QGROUP_INFO_KEY 242
-/*
- * Contains the user configured limits for the qgroup.
- * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
- */
-#define BTRFS_QGROUP_LIMIT_KEY 244
-/*
- * Records the child-parent relationship of qgroups. For
- * each relation, 2 keys are present:
- * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
- * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
- */
-#define BTRFS_QGROUP_RELATION_KEY 246
-
-/*
- * Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY.
- */
-#define BTRFS_BALANCE_ITEM_KEY 248
-
-/*
- * The key type for tree items that are stored persistently, but do not need to
- * exist for extended period of time. The items can exist in any tree.
- *
- * [subtype, BTRFS_TEMPORARY_ITEM_KEY, data]
- *
- * Existing items:
- *
- * - balance status item
- * (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0)
- */
-#define BTRFS_TEMPORARY_ITEM_KEY 248
-
-/*
- * Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY
- */
-#define BTRFS_DEV_STATS_KEY 249
-
-/*
- * The key type for tree items that are stored persistently and usually exist
- * for a long period, eg. filesystem lifetime. The item kinds can be status
- * information, stats or preference values. The item can exist in any tree.
- *
- * [subtype, BTRFS_PERSISTENT_ITEM_KEY, data]
- *
- * Existing items:
- *
- * - device statistics, store IO stats in the device tree, one key for all
- * stats
- * (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0)
- */
-#define BTRFS_PERSISTENT_ITEM_KEY 249
-
-/*
- * Persistantly stores the device replace state in the device tree.
- * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
- */
-#define BTRFS_DEV_REPLACE_KEY 250
-
-/*
- * Stores items that allow to quickly map UUIDs to something else.
- * These items are part of the filesystem UUID tree.
- * The key is built like this:
- * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
- */
-#if BTRFS_UUID_SIZE != 16
-#error "UUID items require BTRFS_UUID_SIZE == 16!"
-#endif
-#define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */
-#define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to
- * received subvols */
-
-/*
- * string items are for debugging. They just store a short string of
- * data in the FS
- */
-#define BTRFS_STRING_ITEM_KEY 253
-
/*
* Flags for mount options.
*
projects / cascardo / linux.git / blobdiff