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Diffstat (limited to 'core/fs/btrfs/btrfs.h')
| -rw-r--r-- | core/fs/btrfs/btrfs.h | 1416 |
1 files changed, 1416 insertions, 0 deletions
diff --git a/core/fs/btrfs/btrfs.h b/core/fs/btrfs/btrfs.h new file mode 100644 index 00000000..8ace266a --- /dev/null +++ b/core/fs/btrfs/btrfs.h @@ -0,0 +1,1416 @@ +/* btrfs.h - an extraction from btrfs-progs-0.18/ctree.h into one file + * + * Copyright (C) 2007 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License v2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef CORE_FS_BTRFS_H +#define CORE_FS_BTRFS_H + +#include <stdint.h> + +typedef int8_t __s8; +typedef uint8_t __u8; +typedef int16_t __s16; +typedef uint16_t __u16; +typedef int32_t __s32; +typedef uint32_t __u32; +typedef int64_t __s64; +typedef uint64_t __u64; + +typedef __s8 s8; +typedef __u8 u8; +typedef __u16 u16; +typedef __u32 u32; +typedef __u64 u64; +typedef __s64 s64; + +#define __bitwise + +typedef u16 __bitwise __le16; +typedef u32 __bitwise __le32; +typedef u64 __bitwise __le64; + +/* linux/posix_type.h */ +typedef long linux_off_t; + +/* linux/little_endian.h */ +#define cpu_to_le64(x) ((__u64) (x)) +#define le64_to_cpu(x) ((__u64) (x)) +#define cpu_to_le32(x) ((__u32) (x)) +#define le32_to_cpu(x) ((__u32) (x)) +#define cpu_to_le16(x) ((__u16) (x)) +#define le16_to_cpu(x) ((__u16) (x)) +#define le8_to_cpu(x) ((__u8) (x)) +#define cpu_to_le8(x) ((__u8) (x)) + +/* linux/stat.h */ +#define S_IFMT 00170000 +#define S_IFLNK 0120000 +#define S_IFREG 0100000 +#define S_IFDIR 0040000 +#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK) +#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG) +#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) + +struct btrfs_root; +#define BTRFS_MAGIC "_BHRfS_M" + +#define BTRFS_SUPER_INFO_OFFSET (64 * 1024) +#define BTRFS_SUPER_INFO_SIZE 4096 + +#define BTRFS_SUPER_MIRROR_MAX 3 +#define BTRFS_SUPER_MIRROR_SHIFT 12 + +#define PATH_MAX 1024 /* include/linux/limits.h */ +#define MAX_LINK_COUNT 5 /* number of symbolic links + to follow */ +#define BTRFS_MAX_LEVEL 8 +#define BTRFS_ROOT_TREE_OBJECTID 1ULL +#define BTRFS_EXTENT_TREE_OBJECTID 2ULL +#define BTRFS_CHUNK_TREE_OBJECTID 3ULL +#define BTRFS_DEV_TREE_OBJECTID 4ULL +#define BTRFS_FS_TREE_OBJECTID 5ULL +#define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL +#define BTRFS_CSUM_TREE_OBJECTID 7ULL + +#define BTRFS_ORPHAN_OBJECTID -5ULL +#define BTRFS_TREE_LOG_OBJECTID -6ULL +#define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL +#define BTRFS_TREE_RELOC_OBJECTID -8ULL +#define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL +#define BTRFS_EXTENT_CSUM_OBJECTID -10ULL + +#define BTRFS_MULTIPLE_OBJECTIDS -255ULL +#define BTRFS_FIRST_FREE_OBJECTID 256ULL +#define BTRFS_LAST_FREE_OBJECTID -256ULL +#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL +#define BTRFS_DEV_ITEMS_OBJECTID 1ULL + + +#define BTRFS_NAME_LEN 255 +#define BTRFS_CSUM_SIZE 32 +#define BTRFS_CSUM_TYPE_CRC32 0 + +static int btrfs_csum_sizes[] = { 4, 0 }; + +/* four bytes for CRC32 */ +#define BTRFS_CRC32_SIZE 4 +#define BTRFS_EMPTY_DIR_SIZE 0 + +#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 + +#define BTRFS_UUID_SIZE 16 + +#define BTRFS_DEFAULT_NUM_DEVICES 1 +#define BTRFS_DEFAULT_NODE_SIZE 4096 +#define BTRFS_DEFAULT_LEAF_SIZE 4096 + +#define WARN_ON(c) +#define cassert(cond) ({ switch (-1) { case (cond): case 0: break; } }) +#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) + +struct btrfs_disk_key { + __le64 objectid; + u8 type; + __le64 offset; +} __attribute__ ((__packed__)); + +/* cpu key */ +struct btrfs_key { + u64 objectid; + u8 type; + u64 offset; +} __attribute__ ((__packed__)); + +/* this represents a divice in a chunk tree */ +struct btrfs_dev_item { + __le64 devid; /* internal device id */ + __le64 total_bytes; /* size of the device */ + __le64 bytes_used; + __le32 io_align; /* optimal io alignment */ + __le32 io_width; /* optimal io width */ + __le32 sector_size; /* minimal io size */ + __le64 type; /* type and info about this device */ + __le64 generation; /* expected generation */ + __le64 start_offset; /* of the partition on a device */ + + /* info for allocation decisions */ + __le32 dev_group; + + u8 seek_speed; /* 0-100 (100 is fastest) */ + u8 bandwidth; /* 0-100 (100 is fastest) */ + + u8 uuid[BTRFS_UUID_SIZE]; /* dev uuid generated by btrfs */ + u8 fsid[BTRFS_UUID_SIZE]; /* uuid of the host FS */ +} __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; + __le64 owner; /* objectid of the root referincing this chunk */ + __le64 stripe_len; + __le64 type; + __le32 io_align; /* optimal io alignment for this chunk */ + __le32 io_width; /* optimal io width for this chunk */ + __le32 sector_size; /* minimal io size for this chunk */ + __le16 num_stripes; + __le16 sub_stripes; /* sub stripes (for raid10) */ + struct btrfs_stripe stripe; +} __attribute__ ((__packed__)); + +static inline unsigned long btrfs_chunk_item_size(int num_stripes) +{ + return sizeof(struct btrfs_chunk) + + sizeof(struct btrfs_stripe) * (num_stripes - 1); +} + +#define BTRFS_FSID_SIZE 16 +#define BTRFS_HEADER_FLAG_WRITTEN (1 << 0) + +struct btrfs_header { + /* these first four must match the super block */ + u8 csum[BTRFS_CSUM_SIZE]; + u8 fsid[BTRFS_FSID_SIZE]; /* uuid of the host fs */ + __le64 bytenr; /* which block this node is supposed to live in */ + __le64 flags; + + /* allowed to be different from the super from here on down */ + u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; + __le64 generation; + __le64 owner; + __le32 nritems; + u8 level; +} __attribute__ ((__packed__)); + +#define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \ + sizeof(struct btrfs_header)) / \ + sizeof(struct btrfs_key_ptr)) +#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header)) +#define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize)) +#define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \ + sizeof(struct btrfs_item) - \ + sizeof(struct btrfs_file_extent_item)) + +#define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32) +#define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33) + +/* + * a portion of superblock which is used + * for chunk translation (up to 14 chunks + * with 3 stripes each. + */ +#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048 +#define BTRFS_LABEL_SIZE 256 + +/* + * the super block basically lists the main trees of the FS + * it currently lacks any block count etc etc + */ +struct btrfs_super_block { + u8 csum[BTRFS_CSUM_SIZE]; + /* the first 3 fields must match struct btrfs_header */ + u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ + __le64 bytenr; /* this block number */ + __le64 flags; + + /* allowed to be different from the btrfs_header from here own down */ + __le64 magic; + __le64 generation; + __le64 root; /* tree root */ + __le64 chunk_root; + __le64 log_root; + + /* this will help find the new super based on the log root */ + __le64 log_root_transid; + __le64 total_bytes; + __le64 bytes_used; + __le64 root_dir_objectid; + __le64 num_devices; + __le32 sectorsize; + __le32 nodesize; + __le32 leafsize; + __le32 stripesize; + __le32 sys_chunk_array_size; + __le64 chunk_root_generation; + __le64 compat_flags; + __le64 compat_ro_flags; + __le64 incompat_flags; + __le16 csum_type; + u8 root_level; + u8 chunk_root_level; + u8 log_root_level; + struct btrfs_dev_item dev_item; + + char label[BTRFS_LABEL_SIZE]; + + /* future expansion */ + __le64 reserved[32]; + u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE]; +} __attribute__ ((__packed__)); + +/* + * 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_SUPP 0x0 +#define BTRFS_FEATURE_COMPAT_RO_SUPP 0x0 +#define BTRFS_FEATURE_INCOMPAT_SUPP 0x0 + +/* Item header for per-leaf lookup */ +struct btrfs_item { + struct btrfs_disk_key key; + __le32 offset; + __le32 size; +} __attribute__ ((__packed__)); + +/* + * Format of the leaves: + * [item0, item1....itemN] [free space] [dataN...data1, data0] + */ +struct btrfs_leaf { + struct btrfs_header header; + struct btrfs_item items[]; +} __attribute__ ((__packed__)); + +/* + * keys-pointers pairs for per-node (non-leaf) lookup + */ +struct btrfs_key_ptr { + struct btrfs_disk_key key; + __le64 blockptr; + __le64 generation; +} __attribute__ ((__packed__)); + +struct btrfs_node { + struct btrfs_header header; + struct btrfs_key_ptr ptrs[]; +} __attribute__ ((__packed__)); + +struct extent_buffer { + /* metadata */ + u64 start; + u64 dev_bytenr; + u32 len; + int refs; + int flags; + char *data; +}; + +static inline void read_extent_buffer(struct extent_buffer *eb, + void *dst, unsigned long start, + unsigned long len) +{ + memcpy(dst, eb->data + start, len); +} + +static inline void write_extent_buffer(struct extent_buffer *eb, + const void *src, unsigned long start, + unsigned long len) +{ + memcpy(eb->data + start, src, len); +} + +/* + * NOTE: + * don't increase a number of levels for grub-0.97! + */ +typedef enum { + FIRST_EXTERNAL_LOOKUP_POOL, + SECOND_EXTERNAL_LOOKUP_POOL, + INTERNAL_LOOKUP_POOL, + LAST_LOOKUP_POOL +} lookup_pool_id; + +/* Relationship between lookup pools: + * depth + * + * ^ +----> INTERNAL <----+ + * | | | + * | | | + * - FIRST_EXTERNAL SECOND_EXTERNAL + */ + +struct btrfs_path { + lookup_pool_id lpid; + struct extent_buffer nodes[BTRFS_MAX_LEVEL]; + int slots[BTRFS_MAX_LEVEL]; +}; + +/* + * 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 { + __le32 refs; +} __attribute__ ((__packed__)); + +struct btrfs_extent_ref { + __le64 root; + __le64 generation; + __le64 objectid; + __le32 num_refs; +} __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_timespec { + __le64 sec; + __le32 nsec; +} __attribute__ ((__packed__)); + +typedef enum { + BTRFS_COMPRESS_NONE = 0, + BTRFS_COMPRESS_ZLIB = 1, + BTRFS_COMPRESS_LAST = 2, +} btrfs_compression_type; + +/* we don't understand any encryption methods right now */ +typedef enum { + BTRFS_ENCRYPTION_NONE = 0, + BTRFS_ENCRYPTION_LAST = 1, +} btrfs_encryption_type; + +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_item { + struct btrfs_disk_key location; + __le64 transid; + __le16 data_len; + __le16 name_len; + u8 type; +} __attribute__ ((__packed__)); + +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; +} __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__)); + +#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 + */ + __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) + */ + __le64 num_bytes; + +} __attribute__ ((__packed__)); + +struct btrfs_csum_item { + u8 csum; +} __attribute__ ((__packed__)); + +/* tag for the radix tree of block groups in ram */ +#define BTRFS_BLOCK_GROUP_DATA (1 << 0) +#define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1) +#define BTRFS_BLOCK_GROUP_METADATA (1 << 2) +#define BTRFS_BLOCK_GROUP_RAID0 (1 << 3) +#define BTRFS_BLOCK_GROUP_RAID1 (1 << 4) +#define BTRFS_BLOCK_GROUP_DUP (1 << 5) +#define BTRFS_BLOCK_GROUP_RAID10 (1 << 6) + +struct btrfs_block_group_item { + __le64 used; + __le64 chunk_objectid; + __le64 flags; +} __attribute__ ((__packed__)); + +/* + * in ram representation of the tree. extent_root is used for all allocations + * and for the extent tree extent_root root. + */ +struct btrfs_root { + struct extent_buffer node; + char data[4096]; + struct extent_buffer *commit_root; + struct btrfs_root_item root_item; + struct btrfs_key root_key; + struct btrfs_fs_info *fs_info; + u64 objectid; + u64 last_trans; + + /* data allocations are done in sectorsize units */ + u32 sectorsize; + + /* node allocations are done in nodesize units */ + u32 nodesize; + + /* leaf allocations are done in leafsize units */ + u32 leafsize; + + /* leaf allocations are done in leafsize units */ + u32 stripesize; + + int ref_cows; + int track_dirty; + + + u32 type; + u64 highest_inode; + u64 last_inode_alloc; +}; + +struct btrfs_root; +struct btrfs_fs_devices; +struct btrfs_fs_info { + u8 fsid[BTRFS_FSID_SIZE]; + u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; + struct btrfs_root fs_root; + struct btrfs_root tree_root; + struct btrfs_root chunk_root; + + struct btrfs_key file_info; /* currently opened file */ + struct btrfs_path paths [LAST_LOOKUP_POOL]; + + u64 generation; + u64 last_trans_committed; + + u64 system_alloc_profile; + u64 alloc_start; + + struct btrfs_super_block super_temp; + struct btrfs_super_block super_copy; + + u64 super_bytenr; + u64 total_pinned; + + int system_allocs; + int readonly; +}; + +/* + * 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_XATTR_ITEM_KEY 24 +#define BTRFS_ORPHAN_ITEM_KEY 48 + +#define BTRFS_DIR_LOG_ITEM_KEY 60 +#define BTRFS_DIR_LOG_INDEX_KEY 72 +/* + * dir items are the name -> inode pointers in a directory. There is one + * for every name in a directory. + */ +#define BTRFS_DIR_ITEM_KEY 84 +#define BTRFS_DIR_INDEX_KEY 96 + +/* + * extent data is for file data + */ +#define BTRFS_EXTENT_DATA_KEY 108 + +/* + * csum items have the checksums for data in the extents + */ +#define BTRFS_CSUM_ITEM_KEY 120 +/* + * 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. There 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 +#define BTRFS_EXTENT_REF_KEY 180 + +/* + * block groups give us hints into the extent allocation trees. Which + * blocks are free etc etc + */ +#define BTRFS_BLOCK_GROUP_ITEM_KEY 192 + +#define BTRFS_DEV_EXTENT_KEY 204 +#define BTRFS_DEV_ITEM_KEY 216 +#define BTRFS_CHUNK_ITEM_KEY 228 + +/* + * string items are for debugging. They just store a short string of + * data in the FS + */ +#define BTRFS_STRING_ITEM_KEY 253 +/* + * Inode flags + */ +#define BTRFS_INODE_NODATASUM (1 << 0) +#define BTRFS_INODE_NODATACOW (1 << 1) +#define BTRFS_INODE_READONLY (1 << 2) + +#define read_eb_member(eb, ptr, type, member, result) ( \ + read_extent_buffer(eb, (char *)(result), \ + ((unsigned long)(ptr)) + \ + offsetof(type, member), \ + sizeof(((type *)0)->member))) + +#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \ +static inline u##bits btrfs_##name(struct extent_buffer *eb) \ +{ \ + struct btrfs_header *h = (struct btrfs_header *)eb->data; \ + return le##bits##_to_cpu(h->member); \ +} \ +static inline void btrfs_set_##name(struct extent_buffer *eb, \ + u##bits val) \ +{ \ + struct btrfs_header *h = (struct btrfs_header *)eb->data; \ + h->member = cpu_to_le##bits(val); \ +} + +#define BTRFS_SETGET_FUNCS(name, type, member, bits) \ +static inline u##bits btrfs_##name(struct extent_buffer *eb, \ + type *s) \ +{ \ + unsigned long offset = (unsigned long)s; \ + type *p = (type *) (eb->data + offset); \ + return le##bits##_to_cpu(p->member); \ +} \ +static inline void btrfs_set_##name(struct extent_buffer *eb, \ + type *s, u##bits val) \ +{ \ + unsigned long offset = (unsigned long)s; \ + type *p = (type *) (eb->data + offset); \ + p->member = cpu_to_le##bits(val); \ +} + +#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \ +static inline u##bits btrfs_##name(type *s) \ +{ \ + return le##bits##_to_cpu(s->member); \ +} \ +static inline void btrfs_set_##name(type *s, u##bits val) \ +{ \ + s->member = cpu_to_le##bits(val); \ +} + +BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64); +BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64); +BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64); +BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32); +BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32); +BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item, + start_offset, 64); +BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32); +BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64); +BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32); +BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8); +BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8); +BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64); + +BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64); +BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item, + total_bytes, 64); +BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item, + bytes_used, 64); +BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item, + io_align, 32); +BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item, + io_width, 32); +BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item, + sector_size, 32); +BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64); +BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item, + dev_group, 32); +BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item, + seek_speed, 8); +BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item, + bandwidth, 8); +BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item, + generation, 64); + +static inline char *btrfs_device_uuid(struct btrfs_dev_item *d) +{ + return (char *)d + offsetof(struct btrfs_dev_item, uuid); +} + +static inline char *btrfs_device_fsid(struct btrfs_dev_item *d) +{ + return (char *)d + offsetof(struct btrfs_dev_item, fsid); +} + +BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64); +BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64); +BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64); +BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32); +BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32); +BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32); +BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64); +BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16); +BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16); +BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64); +BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64); + +static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s) +{ + return (char *)s + offsetof(struct btrfs_stripe, dev_uuid); +} + +BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64); +BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64); +BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk, + stripe_len, 64); +BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk, + io_align, 32); +BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk, + io_width, 32); +BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk, + sector_size, 32); +BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64); +BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk, + num_stripes, 16); +BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk, + sub_stripes, 16); +BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64); +BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64); + +static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c, + int nr) +{ + unsigned long offset = (unsigned long)c; + offset += offsetof(struct btrfs_chunk, stripe); + offset += nr * sizeof(struct btrfs_stripe); + return (struct btrfs_stripe *)offset; +} + +static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr) +{ + return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr)); +} + +static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb, + struct btrfs_chunk *c, int nr) +{ + return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr)); +} + +static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb, + struct btrfs_chunk *c, int nr, + u64 val) +{ + btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val); +} + +static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb, + struct btrfs_chunk *c, int nr) +{ + return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr)); +} + +static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb, + struct btrfs_chunk *c, int nr, + u64 val) +{ + btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val); +} + +/* struct btrfs_block_group_item */ +BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item, + used, 64); +BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item, + used, 64); +BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid, + struct btrfs_block_group_item, chunk_objectid, 64); + +BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid, + struct btrfs_block_group_item, chunk_objectid, 64); +BTRFS_SETGET_FUNCS(disk_block_group_flags, + struct btrfs_block_group_item, flags, 64); +BTRFS_SETGET_STACK_FUNCS(block_group_flags, + struct btrfs_block_group_item, flags, 64); + +/* struct btrfs_inode_ref */ +BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16); +BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64); + +/* struct btrfs_inode_item */ +BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64); +BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64); +BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64); +BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64); +BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64); +BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64); +BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32); +BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32); +BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32); +BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32); +BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64); +BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64); + +BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, + struct btrfs_inode_item, generation, 64); +BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, + struct btrfs_inode_item, generation, 64); +BTRFS_SETGET_STACK_FUNCS(stack_inode_size, + struct btrfs_inode_item, size, 64); +BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, + struct btrfs_inode_item, nbytes, 64); +BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, + struct btrfs_inode_item, block_group, 64); +BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, + struct btrfs_inode_item, nlink, 32); +BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, + struct btrfs_inode_item, uid, 32); +BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, + struct btrfs_inode_item, gid, 32); +BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, + struct btrfs_inode_item, mode, 32); +BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, + struct btrfs_inode_item, rdev, 64); +BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, + struct btrfs_inode_item, flags, 64); + +BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64); +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); + +/* 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, + chunk_objectid, 64); +BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent, + chunk_offset, 64); +BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64); + +static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev) +{ + unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid); + return (u8 *)((unsigned long)dev + ptr); +} + +/* struct btrfs_extent_ref */ +BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64); +BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64); +BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64); +BTRFS_SETGET_FUNCS(ref_num_refs, struct btrfs_extent_ref, num_refs, 32); + +BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64); +BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref, + generation, 64); +BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref, + objectid, 64); +BTRFS_SETGET_STACK_FUNCS(stack_ref_num_refs, struct btrfs_extent_ref, + num_refs, 32); + +/* struct btrfs_extent_item */ +BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32); +BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item, + refs, 32); + +/* struct btrfs_node */ +BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64); +BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64); + +static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr) +{ + unsigned long ptr; + ptr = offsetof(struct btrfs_node, ptrs) + + sizeof(struct btrfs_key_ptr) * nr; + return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr); +} + +static inline void btrfs_set_node_blockptr(struct extent_buffer *eb, + int nr, u64 val) +{ + unsigned long ptr; + ptr = offsetof(struct btrfs_node, ptrs) + + sizeof(struct btrfs_key_ptr) * nr; + btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val); +} + +static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr) +{ + unsigned long ptr; + ptr = offsetof(struct btrfs_node, ptrs) + + sizeof(struct btrfs_key_ptr) * nr; + return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr); +} + +static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb, + int nr, u64 val) +{ + unsigned long ptr; + ptr = offsetof(struct btrfs_node, ptrs) + + sizeof(struct btrfs_key_ptr) * nr; + btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val); +} + +static inline unsigned long btrfs_node_key_ptr_offset(int nr) +{ + return offsetof(struct btrfs_node, ptrs) + + sizeof(struct btrfs_key_ptr) * nr; +} + +static inline void btrfs_node_key(struct extent_buffer *eb, + struct btrfs_disk_key *disk_key, int nr) +{ + unsigned long ptr; + ptr = btrfs_node_key_ptr_offset(nr); + read_eb_member(eb, (struct btrfs_key_ptr *)ptr, + struct btrfs_key_ptr, key, disk_key); +} + +/* struct btrfs_item */ +BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32); +BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32); + +static inline unsigned long btrfs_item_nr_offset(int nr) +{ + return offsetof(struct btrfs_leaf, items) + + sizeof(struct btrfs_item) * nr; +} + +static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb, + int nr) +{ + return (struct btrfs_item *)btrfs_item_nr_offset(nr); +} + +static inline u32 btrfs_item_end(struct extent_buffer *eb, + struct btrfs_item *item) +{ + return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item); +} + +static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr) +{ + return btrfs_item_end(eb, btrfs_item_nr(eb, nr)); +} + +static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr) +{ + return btrfs_item_offset(eb, btrfs_item_nr(eb, nr)); +} + +static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr) +{ + return btrfs_item_size(eb, btrfs_item_nr(eb, nr)); +} + +static inline void btrfs_item_key(struct extent_buffer *eb, + struct btrfs_disk_key *disk_key, int nr) +{ + struct btrfs_item *item = btrfs_item_nr(eb, nr); + read_eb_member(eb, item, struct btrfs_item, key, disk_key); +} + +/* + * struct btrfs_root_ref + */ +BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64); +BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64); +BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16); + +/* struct btrfs_dir_item */ +BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16); +BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8); +BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16); +BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64); + +static inline void btrfs_dir_item_key(struct extent_buffer *eb, + struct btrfs_dir_item *item, + struct btrfs_disk_key *key) +{ + read_eb_member(eb, item, struct btrfs_dir_item, location, key); +} + +/* struct btrfs_disk_key */ +BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key, + objectid, 64); +BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64); +BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8); + +static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu, + struct btrfs_disk_key *disk) +{ + cpu->offset = le64_to_cpu(disk->offset); + cpu->type = disk->type; + cpu->objectid = le64_to_cpu(disk->objectid); +} + +static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk, + struct btrfs_key *cpu) +{ + disk->offset = cpu_to_le64(cpu->offset); + disk->type = cpu->type; + disk->objectid = cpu_to_le64(cpu->objectid); +} + +static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb, + struct btrfs_key *key, int nr) +{ + struct btrfs_disk_key disk_key; + btrfs_node_key(eb, &disk_key, nr); + btrfs_disk_key_to_cpu(key, &disk_key); +} + +static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb, + struct btrfs_key *key, int nr) +{ + struct btrfs_disk_key disk_key; + btrfs_item_key(eb, &disk_key, nr); + btrfs_disk_key_to_cpu(key, &disk_key); +} + +static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb, + struct btrfs_dir_item *item, + struct btrfs_key *key) +{ + struct btrfs_disk_key disk_key; + btrfs_dir_item_key(eb, item, &disk_key); + btrfs_disk_key_to_cpu(key, &disk_key); +} + +static inline u8 btrfs_key_type(struct btrfs_key *key) +{ + return key->type; +} + +static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val) +{ + key->type = val; +} + +/* struct btrfs_header */ +BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64); +BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header, + generation, 64); +BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64); +BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32); +BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64); +BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8); + +/* struct btrfs_root_item */ +BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item, + generation, 64); +BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32); +BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64); +BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8); + +BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item, + generation, 64); +BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64); +BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8); +BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64); +BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32); +BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64); +BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64); +BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64); +BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item, + last_snapshot, 64); + +/* struct btrfs_super_block */ + +BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64); +BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64); +BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block, + generation, 64); +BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64); +BTRFS_SETGET_STACK_FUNCS(super_sys_array_size, + struct btrfs_super_block, sys_chunk_array_size, 32); +BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation, + struct btrfs_super_block, chunk_root_generation, 64); +BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block, + root_level, 8); +BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block, + chunk_root, 64); +BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block, + chunk_root_level, 8); +BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block, + log_root, 64); +BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block, + log_root_transid, 64); +BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block, + log_root_level, 8); +BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block, + total_bytes, 64); +BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block, + bytes_used, 64); +BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block, + sectorsize, 32); +BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block, + nodesize, 32); +BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block, + leafsize, 32); +BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block, + stripesize, 32); +BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block, + root_dir_objectid, 64); +BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block, + num_devices, 64); +BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block, + compat_flags, 64); +BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block, + compat_flags, 64); +BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block, + incompat_flags, 64); +BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block, + csum_type, 16); + +static inline int btrfs_super_csum_size(struct btrfs_super_block *s) +{ + int t = btrfs_super_csum_type(s); + //BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes)); + return btrfs_csum_sizes[t]; +} + +static inline unsigned long btrfs_leaf_data(struct extent_buffer *l) +{ + return offsetof(struct btrfs_leaf, items); +} + +/* struct btrfs_file_extent_item */ +BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8); + +static inline unsigned long btrfs_file_extent_inline_start(struct + btrfs_file_extent_item *e) +{ + unsigned long offset = (unsigned long)e; + offset += offsetof(struct btrfs_file_extent_item, disk_bytenr); + return offset; +} + +static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize) +{ + return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize; +} + +BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item, + disk_bytenr, 64); +BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item, + generation, 64); +BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item, + disk_num_bytes, 64); +BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item, + offset, 64); +BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item, + num_bytes, 64); +BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item, + ram_bytes, 64); +BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item, + compression, 8); +BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item, + encryption, 8); +BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item, + other_encoding, 16); + +/* this returns the number of file bytes represented by the inline item. + * If an item is compressed, this is the uncompressed size + */ +static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb, + struct btrfs_file_extent_item *e) +{ + return btrfs_file_extent_ram_bytes(eb, e); +} + +/* + * this returns the number of bytes used by the item on disk, minus the + * size of any extent headers. If a file is compressed on disk, this is + * the compressed size + */ +static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb, + struct btrfs_item *e) +{ + unsigned long offset; + offset = offsetof(struct btrfs_file_extent_item, disk_bytenr); + return btrfs_item_size(eb, e) - offset; +} + +static inline u32 btrfs_level_size(struct btrfs_root *root, int level) { + if (level == 0) + return root->leafsize; + return root->nodesize; +} + +static inline u32 btrfs_root_level_size(struct btrfs_super_block *sb) { + return btrfs_super_root_level(sb) == 0 ? + btrfs_super_leafsize(sb) : + btrfs_super_nodesize(sb); +} + +static inline u32 btrfs_chunk_root_level_size(struct btrfs_super_block *sb) { + return btrfs_super_chunk_root_level(sb) == 0 ? + btrfs_super_leafsize(sb) : + btrfs_super_nodesize(sb); +} + +/* helper function to cast into the data area of the leaf. */ +#define btrfs_item_ptr(leaf, slot, type) \ + ((type *)(btrfs_leaf_data(leaf) + \ + btrfs_item_offset_nr(leaf, slot))) + +#define btrfs_item_ptr_offset(leaf, slot) \ + ((unsigned long)(btrfs_leaf_data(leaf) + \ + btrfs_item_offset_nr(leaf, slot))) + +/*volumes.h */ + +struct btrfs_fs_devices { + u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ + + /* the device with this id has the most recent coyp of the super */ + u64 latest_devid; + u64 latest_trans; + u64 lowest_devid; + int latest_bdev; + int lowest_bdev; + int seeding; + struct btrfs_fs_devices *seed; +}; + +struct btrfs_bio_stripe { + u64 physical; +}; + +#define MAX_NRSTRIPES 8 +struct btrfs_multi_bio { + int error; + int num_stripes; + struct btrfs_bio_stripe stripes[MAX_NRSTRIPES]; +}; + +#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ + (sizeof(struct btrfs_bio_stripe) * (n))) + +static int aux_tree_lookup(struct btrfs_root *root, + struct btrfs_key *key, + struct btrfs_path *path); + +struct cache_extent { + u64 start; + u64 size; +}; + +struct map_lookup { + struct cache_extent ce; + u64 type; + int io_align; + int io_width; + int stripe_len; + int sector_size; + int num_stripes; + int sub_stripes; + struct btrfs_bio_stripe stripes[MAX_NRSTRIPES]; +}; + +/* "VFS" things */ + +/* file types recognized by grub */ +typedef enum { + BTRFS_REGULAR_FILE, + BTRFS_DIRECTORY_FILE, + BTRFS_SYMLINK_FILE, + BTRFS_UNKNOWN_FILE +} btrfs_file_type; + +static inline int coord_is_root(struct btrfs_root *root, + struct btrfs_path *path) +{ + return btrfs_header_bytenr(&path->nodes[0]) == + btrfs_header_bytenr(&root->node); +} + +static inline btrfs_file_type btrfs_get_file_type (int mode) +{ + if (S_ISLNK(mode)) + return BTRFS_SYMLINK_FILE; + if (S_ISREG(mode)) + return BTRFS_REGULAR_FILE; + if (S_ISDIR(mode)) + return BTRFS_DIRECTORY_FILE; + return BTRFS_UNKNOWN_FILE; +} + +#define min_t(type,x,y) \ + ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; }) +#define max_t(type,x,y) \ + ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; }) + + +int sys_array_lookup(struct map_lookup *map, u64 logical); +int tree_chunk_lookup(struct map_lookup *map, + u64 logical); +int __btrfs_map_block(u64 logical, u64 *length, + struct btrfs_multi_bio *multi_ret, int mirror_num); +int read_tree_block(struct btrfs_root *root, + struct extent_buffer *eb, + u64 bytenr, /* logical */ + u32 blocksize, + u64 parent_transid, + lookup_pool_id lpid); +int check_read_chunk(struct btrfs_key *key, + struct extent_buffer *leaf, + struct btrfs_chunk *chunk, + struct map_lookup *map, + u64 logical); + +#endif /* CORE_FS_BTRFS_H */ + +/* + Local variables: + c-indentation-style: "K&R" + mode-name: "LC" + c-basic-offset: 8 + tab-width: 8 + fill-column: 80 + scroll-step: 1 + End: +*/ |