| /* |
| * 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 __BTRFS_CTREE__ |
| #define __BTRFS_CTREE__ |
| |
| #include <linux/mm.h> |
| #include <linux/highmem.h> |
| #include <linux/fs.h> |
| #include <linux/rwsem.h> |
| #include <linux/completion.h> |
| #include <linux/backing-dev.h> |
| #include <linux/wait.h> |
| #include <linux/slab.h> |
| #include <linux/kobject.h> |
| #include <trace/events/btrfs.h> |
| #include <asm/kmap_types.h> |
| #include <linux/pagemap.h> |
| #include "extent_io.h" |
| #include "extent_map.h" |
| #include "async-thread.h" |
| #include "ioctl.h" |
| |
| struct btrfs_trans_handle; |
| struct btrfs_transaction; |
| struct btrfs_pending_snapshot; |
| extern struct kmem_cache *btrfs_trans_handle_cachep; |
| extern struct kmem_cache *btrfs_transaction_cachep; |
| extern struct kmem_cache *btrfs_bit_radix_cachep; |
| extern struct kmem_cache *btrfs_path_cachep; |
| extern struct kmem_cache *btrfs_free_space_cachep; |
| struct btrfs_ordered_sum; |
| |
| #define BTRFS_MAGIC "_BHRfS_M" |
| |
| #define BTRFS_MAX_LEVEL 8 |
| |
| #define BTRFS_COMPAT_EXTENT_TREE_V0 |
| |
| /* |
| * files bigger than this get some pre-flushing when they are added |
| * to the ordered operations list. That way we limit the total |
| * work done by the commit |
| */ |
| #define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024) |
| |
| /* 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 |
| |
| /* 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 sotring |
| * 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 |
| |
| /* |
| * we can actually store much bigger names, but lets not confuse the rest |
| * of linux |
| */ |
| #define BTRFS_NAME_LEN 255 |
| |
| /* 32 bytes in various csum fields */ |
| #define BTRFS_CSUM_SIZE 32 |
| |
| /* csum types */ |
| #define BTRFS_CSUM_TYPE_CRC32 0 |
| |
| static int btrfs_csum_sizes[] = { 4, 0 }; |
| |
| /* four bytes for CRC32 */ |
| #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 |
| |
| /* |
| * 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); |
| return sizeof(struct btrfs_chunk) + |
| sizeof(struct btrfs_stripe) * (num_stripes - 1); |
| } |
| |
| #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0) |
| #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1) |
| |
| /* |
| * File system states |
| */ |
| |
| /* 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) << \ |
| BTRFS_BACKREF_REV_SHIFT) |
| |
| #define BTRFS_OLD_BACKREF_REV 0 |
| #define BTRFS_MIXED_BACKREF_REV 1 |
| |
| /* |
| * every tree block (leaf or node) starts with this header. |
| */ |
| struct btrfs_header { |
| /* these first four must match the super block */ |
| u8 csum[BTRFS_CSUM_SIZE]; |
| u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ |
| __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_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \ |
| sizeof(struct btrfs_item) -\ |
| sizeof(struct btrfs_dir_item)) |
| |
| |
| /* |
| * this is a very generous portion of the super block, giving us |
| * 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, |
| * we store an array of the roots from previous transactions |
| * in the super. |
| */ |
| #define BTRFS_NUM_BACKUP_ROOTS 4 |
| struct btrfs_root_backup { |
| __le64 tree_root; |
| __le64 tree_root_gen; |
| |
| __le64 chunk_root; |
| __le64 chunk_root_gen; |
| |
| __le64 extent_root; |
| __le64 extent_root_gen; |
| |
| __le64 fs_root; |
| __le64 fs_root_gen; |
| |
| __le64 dev_root; |
| __le64 dev_root_gen; |
| |
| __le64 csum_root; |
| __le64 csum_root_gen; |
| |
| __le64 total_bytes; |
| __le64 bytes_used; |
| __le64 num_devices; |
| /* future */ |
| __le64 unsed_64[4]; |
| |
| u8 tree_root_level; |
| u8 chunk_root_level; |
| u8 extent_root_level; |
| u8 fs_root_level; |
| u8 dev_root_level; |
| u8 csum_root_level; |
| /* future and to align */ |
| u8 unused_8[10]; |
| } __attribute__ ((__packed__)); |
| |
| /* |
| * 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 4 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; |
| __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]; |
| |
| __le64 cache_generation; |
| |
| /* future expansion */ |
| __le64 reserved[31]; |
| u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE]; |
| struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS]; |
| } __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_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) |
| |
| #define BTRFS_FEATURE_COMPAT_SUPP 0ULL |
| #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL |
| #define BTRFS_FEATURE_INCOMPAT_SUPP \ |
| (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \ |
| BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \ |
| BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \ |
| BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO) |
| |
| /* |
| * A leaf is full of items. offset and size tell us where to find |
| * the item in the leaf (relative to the start of the data area) |
| */ |
| struct btrfs_item { |
| struct btrfs_disk_key key; |
| __le32 offset; |
| __le32 size; |
| } __attribute__ ((__packed__)); |
| |
| /* |
| * leaves have an item area and a data area: |
| * [item0, item1....itemN] [free space] [dataN...data1, data0] |
| * |
| * The data is separate from the items to get the keys closer together |
| * during searches. |
| */ |
| struct btrfs_leaf { |
| struct btrfs_header header; |
| struct btrfs_item items[]; |
| } __attribute__ ((__packed__)); |
| |
| /* |
| * all non-leaf blocks are nodes, they hold only keys and pointers to |
| * other blocks |
| */ |
| 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__)); |
| |
| /* |
| * btrfs_paths remember the path taken from the root down to the leaf. |
| * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point |
| * to any other levels that are present. |
| * |
| * The slots array records the index of the item or block pointer |
| * used while walking the tree. |
| */ |
| struct btrfs_path { |
| struct extent_buffer *nodes[BTRFS_MAX_LEVEL]; |
| int slots[BTRFS_MAX_LEVEL]; |
| /* if there is real range locking, this locks field will change */ |
| int locks[BTRFS_MAX_LEVEL]; |
| int reada; |
| /* keep some upper locks as we walk down */ |
| int lowest_level; |
| |
| /* |
| * set by btrfs_split_item, tells search_slot to keep all locks |
| * and to force calls to keep space in the nodes |
| */ |
| unsigned int search_for_split:1; |
| unsigned int keep_locks:1; |
| unsigned int skip_locking:1; |
| unsigned int leave_spinning:1; |
| unsigned int search_commit_root: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_timespec { |
| __le64 sec; |
| __le32 nsec; |
| } __attribute__ ((__packed__)); |
| |
| enum btrfs_compression_type { |
| BTRFS_COMPRESS_NONE = 0, |
| BTRFS_COMPRESS_ZLIB = 1, |
| BTRFS_COMPRESS_LZO = 2, |
| BTRFS_COMPRESS_TYPES = 2, |
| BTRFS_COMPRESS_LAST = 3, |
| }; |
| |
| 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) |
| |
| 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). This |
| * always reflects the size uncompressed and without encoding. |
| */ |
| __le64 num_bytes; |
| |
| } __attribute__ ((__packed__)); |
| |
| struct btrfs_csum_item { |
| u8 csum; |
| } __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_NR_RAID_TYPES 5 |
| |
| #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_DUP | \ |
| BTRFS_BLOCK_GROUP_RAID10) |
| struct btrfs_block_group_item { |
| __le64 used; |
| __le64 chunk_objectid; |
| __le64 flags; |
| } __attribute__ ((__packed__)); |
| |
| struct btrfs_space_info { |
| u64 flags; |
| |
| u64 total_bytes; /* total bytes in the space, |
| this doesn't take mirrors into account */ |
| u64 bytes_used; /* total bytes used, |
| this doesn't take mirrors into account */ |
| u64 bytes_pinned; /* total bytes pinned, will be freed when the |
| transaction finishes */ |
| u64 bytes_reserved; /* total bytes the allocator has reserved for |
| current allocations */ |
| u64 bytes_readonly; /* total bytes that are read only */ |
| |
| u64 bytes_may_use; /* number of bytes that may be used for |
| delalloc/allocations */ |
| u64 disk_used; /* total bytes used on disk */ |
| u64 disk_total; /* total bytes on disk, takes mirrors into |
| account */ |
| |
| /* |
| * we bump reservation progress every time we decrement |
| * bytes_reserved. This way people waiting for reservations |
| * know something good has happened and they can check |
| * for progress. The number here isn't to be trusted, it |
| * just shows reclaim activity |
| */ |
| unsigned long reservation_progress; |
| |
| unsigned int full:1; /* indicates that we cannot allocate any more |
| chunks for this space */ |
| unsigned int chunk_alloc:1; /* set if we are allocating a chunk */ |
| |
| unsigned int flush:1; /* set if we are trying to make space */ |
| |
| unsigned int force_alloc; /* set if we need to force a chunk |
| alloc for this space */ |
| |
| struct list_head list; |
| |
| /* for block groups in our same type */ |
| struct list_head block_groups[BTRFS_NR_RAID_TYPES]; |
| spinlock_t lock; |
| struct rw_semaphore groups_sem; |
| wait_queue_head_t wait; |
| }; |
| |
| struct btrfs_block_rsv { |
| u64 size; |
| u64 reserved; |
| struct btrfs_space_info *space_info; |
| spinlock_t lock; |
| unsigned int full:1; |
| }; |
| |
| /* |
| * free clusters are used to claim free space in relatively large chunks, |
| * allowing us to do less seeky writes. They are used for all metadata |
| * allocations and data allocations in ssd mode. |
| */ |
| struct btrfs_free_cluster { |
| spinlock_t lock; |
| spinlock_t refill_lock; |
| struct rb_root root; |
| |
| /* largest extent in this cluster */ |
| u64 max_size; |
| |
| /* first extent starting offset */ |
| u64 window_start; |
| |
| struct btrfs_block_group_cache *block_group; |
| /* |
| * when a cluster is allocated from a block group, we put the |
| * cluster onto a list in the block group so that it can |
| * be freed before the block group is freed. |
| */ |
| struct list_head block_group_list; |
| }; |
| |
| enum btrfs_caching_type { |
| BTRFS_CACHE_NO = 0, |
| BTRFS_CACHE_STARTED = 1, |
| BTRFS_CACHE_FAST = 2, |
| BTRFS_CACHE_FINISHED = 3, |
| }; |
| |
| enum btrfs_disk_cache_state { |
| BTRFS_DC_WRITTEN = 0, |
| BTRFS_DC_ERROR = 1, |
| BTRFS_DC_CLEAR = 2, |
| BTRFS_DC_SETUP = 3, |
| BTRFS_DC_NEED_WRITE = 4, |
| }; |
| |
| struct btrfs_caching_control { |
| struct list_head list; |
| struct mutex mutex; |
| wait_queue_head_t wait; |
| struct btrfs_work work; |
| struct btrfs_block_group_cache *block_group; |
| u64 progress; |
| atomic_t count; |
| }; |
| |
| struct btrfs_block_group_cache { |
| struct btrfs_key key; |
| struct btrfs_block_group_item item; |
| struct btrfs_fs_info *fs_info; |
| struct inode *inode; |
| spinlock_t lock; |
| u64 pinned; |
| u64 reserved; |
| u64 bytes_super; |
| u64 flags; |
| u64 sectorsize; |
| u64 cache_generation; |
| unsigned int ro:1; |
| unsigned int dirty:1; |
| unsigned int iref:1; |
| |
| int disk_cache_state; |
| |
| /* cache tracking stuff */ |
| int cached; |
| struct btrfs_caching_control *caching_ctl; |
| u64 last_byte_to_unpin; |
| |
| struct btrfs_space_info *space_info; |
| |
| /* free space cache stuff */ |
| struct btrfs_free_space_ctl *free_space_ctl; |
| |
| /* block group cache stuff */ |
| struct rb_node cache_node; |
| |
| /* for block groups in the same raid type */ |
| struct list_head list; |
| |
| /* usage count */ |
| atomic_t count; |
| |
| /* List of struct btrfs_free_clusters for this block group. |
| * Today it will only have one thing on it, but that may change |
| */ |
| struct list_head cluster_list; |
| }; |
| |
| struct reloc_control; |
| struct btrfs_device; |
| struct btrfs_fs_devices; |
| struct btrfs_delayed_root; |
| struct btrfs_fs_info { |
| u8 fsid[BTRFS_FSID_SIZE]; |
| u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; |
| struct btrfs_root *extent_root; |
| struct btrfs_root *tree_root; |
| struct btrfs_root *chunk_root; |
| struct btrfs_root *dev_root; |
| struct btrfs_root *fs_root; |
| struct btrfs_root *csum_root; |
| |
| /* the log root tree is a directory of all the other log roots */ |
| struct btrfs_root *log_root_tree; |
| |
| spinlock_t fs_roots_radix_lock; |
| struct radix_tree_root fs_roots_radix; |
| |
| /* block group cache stuff */ |
| spinlock_t block_group_cache_lock; |
| struct rb_root block_group_cache_tree; |
| |
| /* keep track of unallocated space */ |
| spinlock_t free_chunk_lock; |
| u64 free_chunk_space; |
| |
| struct extent_io_tree freed_extents[2]; |
| struct extent_io_tree *pinned_extents; |
| |
| /* logical->physical extent mapping */ |
| struct btrfs_mapping_tree mapping_tree; |
| |
| /* |
| * block reservation for extent, checksum, root tree and |
| * delayed dir index item |
| */ |
| struct btrfs_block_rsv global_block_rsv; |
| /* block reservation for delay allocation */ |
| struct btrfs_block_rsv delalloc_block_rsv; |
| /* block reservation for metadata operations */ |
| struct btrfs_block_rsv trans_block_rsv; |
| /* block reservation for chunk tree */ |
| struct btrfs_block_rsv chunk_block_rsv; |
| /* block reservation for delayed operations */ |
| struct btrfs_block_rsv delayed_block_rsv; |
| |
| struct btrfs_block_rsv empty_block_rsv; |
| |
| u64 generation; |
| u64 last_trans_committed; |
| |
| /* |
| * this is updated to the current trans every time a full commit |
| * is required instead of the faster short fsync log commits |
| */ |
| u64 last_trans_log_full_commit; |
| unsigned long mount_opt:20; |
| unsigned long compress_type:4; |
| u64 max_inline; |
| u64 alloc_start; |
| struct btrfs_transaction *running_transaction; |
| wait_queue_head_t transaction_throttle; |
| wait_queue_head_t transaction_wait; |
| wait_queue_head_t transaction_blocked_wait; |
| wait_queue_head_t async_submit_wait; |
| |
| struct btrfs_super_block *super_copy; |
| struct btrfs_super_block *super_for_commit; |
| struct block_device *__bdev; |
| struct super_block *sb; |
| struct inode *btree_inode; |
| struct backing_dev_info bdi; |
| struct mutex tree_log_mutex; |
| struct mutex transaction_kthread_mutex; |
| struct mutex cleaner_mutex; |
| struct mutex chunk_mutex; |
| struct mutex volume_mutex; |
| /* |
| * this protects the ordered operations list only while we are |
| * processing all of the entries on it. This way we make |
| * sure the commit code doesn't find the list temporarily empty |
| * because another function happens to be doing non-waiting preflush |
| * before jumping into the main commit. |
| */ |
| struct mutex ordered_operations_mutex; |
| struct rw_semaphore extent_commit_sem; |
| |
| struct rw_semaphore cleanup_work_sem; |
| |
| struct rw_semaphore subvol_sem; |
| struct srcu_struct subvol_srcu; |
| |
| spinlock_t trans_lock; |
| /* |
| * the reloc mutex goes with the trans lock, it is taken |
| * during commit to protect us from the relocation code |
| */ |
| struct mutex reloc_mutex; |
| |
| struct list_head trans_list; |
| struct list_head hashers; |
| struct list_head dead_roots; |
| struct list_head caching_block_groups; |
| |
| spinlock_t delayed_iput_lock; |
| struct list_head delayed_iputs; |
| |
| atomic_t nr_async_submits; |
| atomic_t async_submit_draining; |
| atomic_t nr_async_bios; |
| atomic_t async_delalloc_pages; |
| atomic_t open_ioctl_trans; |
| |
| /* |
| * this is used by the balancing code to wait for all the pending |
| * ordered extents |
| */ |
| spinlock_t ordered_extent_lock; |
| |
| /* |
| * all of the data=ordered extents pending writeback |
| * these can span multiple transactions and basically include |
| * every dirty data page that isn't from nodatacow |
| */ |
| struct list_head ordered_extents; |
| |
| /* |
| * all of the inodes that have delalloc bytes. It is possible for |
| * this list to be empty even when there is still dirty data=ordered |
| * extents waiting to finish IO. |
| */ |
| struct list_head delalloc_inodes; |
| |
| /* |
| * special rename and truncate targets that must be on disk before |
| * we're allowed to commit. This is basically the ext3 style |
| * data=ordered list. |
| */ |
| struct list_head ordered_operations; |
| |
| /* |
| * there is a pool of worker threads for checksumming during writes |
| * and a pool for checksumming after reads. This is because readers |
| * can run with FS locks held, and the writers may be waiting for |
| * those locks. We don't want ordering in the pending list to cause |
| * deadlocks, and so the two are serviced separately. |
| * |
| * A third pool does submit_bio to avoid deadlocking with the other |
| * two |
| */ |
| struct btrfs_workers generic_worker; |
| struct btrfs_workers workers; |
| struct btrfs_workers delalloc_workers; |
| struct btrfs_workers endio_workers; |
| struct btrfs_workers endio_meta_workers; |
| struct btrfs_workers endio_meta_write_workers; |
| struct btrfs_workers endio_write_workers; |
| struct btrfs_workers endio_freespace_worker; |
| struct btrfs_workers submit_workers; |
| struct btrfs_workers caching_workers; |
| struct btrfs_workers readahead_workers; |
| |
| /* |
| * fixup workers take dirty pages that didn't properly go through |
| * the cow mechanism and make them safe to write. It happens |
| * for the sys_munmap function call path |
| */ |
| struct btrfs_workers fixup_workers; |
| struct btrfs_workers delayed_workers; |
| struct task_struct *transaction_kthread; |
| struct task_struct *cleaner_kthread; |
| int thread_pool_size; |
| |
| struct kobject super_kobj; |
| struct completion kobj_unregister; |
| int do_barriers; |
| int closing; |
| int log_root_recovering; |
| int enospc_unlink; |
| int trans_no_join; |
| |
| u64 total_pinned; |
| |
| /* protected by the delalloc lock, used to keep from writing |
| * metadata until there is a nice batch |
| */ |
| u64 dirty_metadata_bytes; |
| struct list_head dirty_cowonly_roots; |
| |
| struct btrfs_fs_devices *fs_devices; |
| |
| /* |
| * the space_info list is almost entirely read only. It only changes |
| * when we add a new raid type to the FS, and that happens |
| * very rarely. RCU is used to protect it. |
| */ |
| struct list_head space_info; |
| |
| struct reloc_control *reloc_ctl; |
| |
| spinlock_t delalloc_lock; |
| u64 delalloc_bytes; |
| |
| /* data_alloc_cluster is only used in ssd mode */ |
| struct btrfs_free_cluster data_alloc_cluster; |
| |
| /* all metadata allocations go through this cluster */ |
| struct btrfs_free_cluster meta_alloc_cluster; |
| |
| /* auto defrag inodes go here */ |
| spinlock_t defrag_inodes_lock; |
| struct rb_root defrag_inodes; |
| atomic_t defrag_running; |
| |
| spinlock_t ref_cache_lock; |
| u64 total_ref_cache_size; |
| |
| u64 avail_data_alloc_bits; |
| u64 avail_metadata_alloc_bits; |
| u64 avail_system_alloc_bits; |
| |
| unsigned data_chunk_allocations; |
| unsigned metadata_ratio; |
| |
| void *bdev_holder; |
| |
| /* private scrub information */ |
| struct mutex scrub_lock; |
| atomic_t scrubs_running; |
| atomic_t scrub_pause_req; |
| atomic_t scrubs_paused; |
| atomic_t scrub_cancel_req; |
| wait_queue_head_t scrub_pause_wait; |
| struct rw_semaphore scrub_super_lock; |
| int scrub_workers_refcnt; |
| struct btrfs_workers scrub_workers; |
| |
| /* filesystem state */ |
| u64 fs_state; |
| |
| struct btrfs_delayed_root *delayed_root; |
| |
| /* readahead tree */ |
| spinlock_t reada_lock; |
| struct radix_tree_root reada_tree; |
| |
| /* next backup root to be overwritten */ |
| int backup_root_index; |
| }; |
| |
| /* |
| * 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; |
| |
| struct extent_buffer *commit_root; |
| struct btrfs_root *log_root; |
| struct btrfs_root *reloc_root; |
| |
| struct btrfs_root_item root_item; |
| struct btrfs_key root_key; |
| struct btrfs_fs_info *fs_info; |
| struct extent_io_tree dirty_log_pages; |
| |
| struct kobject root_kobj; |
| struct completion kobj_unregister; |
| struct mutex objectid_mutex; |
| |
| spinlock_t accounting_lock; |
| struct btrfs_block_rsv *block_rsv; |
| |
| /* free ino cache stuff */ |
| struct mutex fs_commit_mutex; |
| struct btrfs_free_space_ctl *free_ino_ctl; |
| enum btrfs_caching_type cached; |
| spinlock_t cache_lock; |
| wait_queue_head_t cache_wait; |
| struct btrfs_free_space_ctl *free_ino_pinned; |
| u64 cache_progress; |
| struct inode *cache_inode; |
| |
| struct mutex log_mutex; |
| wait_queue_head_t log_writer_wait; |
| wait_queue_head_t log_commit_wait[2]; |
| atomic_t log_writers; |
| atomic_t log_commit[2]; |
| unsigned long log_transid; |
| unsigned long last_log_commit; |
| unsigned long log_batch; |
| pid_t log_start_pid; |
| bool log_multiple_pids; |
| |
| 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; |
| |
| u32 stripesize; |
| |
| u32 type; |
| |
| u64 highest_objectid; |
| |
| /* btrfs_record_root_in_trans is a multi-step process, |
| * and it can race with the balancing code. But the |
| * race is very small, and only the first time the root |
| * is added to each transaction. So in_trans_setup |
| * is used to tell us when more checks are required |
| */ |
| unsigned long in_trans_setup; |
| int ref_cows; |
| int track_dirty; |
| int in_radix; |
| |
| u64 defrag_trans_start; |
| struct btrfs_key defrag_progress; |
| struct btrfs_key defrag_max; |
| int defrag_running; |
| char *name; |
| |
| /* the dirty list is only used by non-reference counted roots */ |
| struct list_head dirty_list; |
| |
| struct list_head root_list; |
| |
| spinlock_t orphan_lock; |
| struct list_head orphan_list; |
| struct btrfs_block_rsv *orphan_block_rsv; |
| int orphan_item_inserted; |
| int orphan_cleanup_state; |
| |
| spinlock_t inode_lock; |
| /* red-black tree that keeps track of in-memory inodes */ |
| struct rb_root inode_tree; |
| |
| /* |
| * radix tree that keeps track of delayed nodes of every inode, |
| * protected by inode_lock |
| */ |
| struct radix_tree_root delayed_nodes_tree; |
| /* |
| * right now this just gets used so that a root has its own devid |
| * for stat. It may be used for more later |
| */ |
| dev_t anon_dev; |
| |
| int force_cow; |
| }; |
| |
| 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_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 |
| |
| #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 |
| |
| #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 |
| |
| /* |
| * Flags for mount options. |
| * |
| * Note: don't forget to add new options to btrfs_show_options() |
| */ |
| #define BTRFS_MOUNT_NODATASUM (1 << 0) |
| #define BTRFS_MOUNT_NODATACOW (1 << 1) |
| #define BTRFS_MOUNT_NOBARRIER (1 << 2) |
| #define BTRFS_MOUNT_SSD (1 << 3) |
| #define BTRFS_MOUNT_DEGRADED (1 << 4) |
| #define BTRFS_MOUNT_COMPRESS (1 << 5) |
| #define BTRFS_MOUNT_NOTREELOG (1 << 6) |
| #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7) |
| #define BTRFS_MOUNT_SSD_SPREAD (1 << 8) |
| #define BTRFS_MOUNT_NOSSD (1 << 9) |
| #define BTRFS_MOUNT_DISCARD (1 << 10) |
| #define BTRFS_MOUNT_FORCE_COMPRESS (1 << 11) |
| #define BTRFS_MOUNT_SPACE_CACHE (1 << 12) |
| #define BTRFS_MOUNT_CLEAR_CACHE (1 << 13) |
| #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14) |
| #define BTRFS_MOUNT_ENOSPC_DEBUG (1 << 15) |
| #define BTRFS_MOUNT_AUTO_DEFRAG (1 << 16) |
| #define BTRFS_MOUNT_INODE_MAP_CACHE (1 << 17) |
| #define BTRFS_MOUNT_RECOVERY (1 << 18) |
| |
| #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt) |
| #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt) |
| #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \ |
| BTRFS_MOUNT_##opt) |
| /* |
| * Inode flags |
| */ |
| #define BTRFS_INODE_NODATASUM (1 << 0) |
| #define BTRFS_INODE_NODATACOW (1 << 1) |
| #define BTRFS_INODE_READONLY (1 << 2) |
| #define BTRFS_INODE_NOCOMPRESS (1 << 3) |
| #define BTRFS_INODE_PREALLOC (1 << 4) |
| #define BTRFS_INODE_SYNC (1 << 5) |
| #define BTRFS_INODE_IMMUTABLE (1 << 6) |
| #define BTRFS_INODE_APPEND (1 << 7) |
| #define BTRFS_INODE_NODUMP (1 << 8) |
| #define BTRFS_INODE_NOATIME (1 << 9) |
| #define BTRFS_INODE_DIRSYNC (1 << 10) |
| #define BTRFS_INODE_COMPRESS (1 << 11) |
| |
| #define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31) |
| |
| /* some macros to generate set/get funcs for the struct fields. This |
| * assumes there is a lefoo_to_cpu for every type, so lets make a simple |
| * one for u8: |
| */ |
| #define le8_to_cpu(v) (v) |
| #define cpu_to_le8(v) (v) |
| #define __le8 u8 |
| |
| #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 write_eb_member(eb, ptr, type, member, result) ( \ |
| write_extent_buffer(eb, (char *)(result), \ |
| ((unsigned long)(ptr)) + \ |
| offsetof(type, member), \ |
| sizeof(((type *)0)->member))) |
| |
| #ifndef BTRFS_SETGET_FUNCS |
| #define BTRFS_SETGET_FUNCS(name, type, member, bits) \ |
| u##bits btrfs_##name(struct extent_buffer *eb, type *s); \ |
| void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val); |
| #endif |
| |
| #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \ |
| static inline u##bits btrfs_##name(struct extent_buffer *eb) \ |
| { \ |
| type *p = page_address(eb->first_page); \ |
| u##bits res = le##bits##_to_cpu(p->member); \ |
| return res; \ |
| } \ |
| static inline void btrfs_set_##name(struct extent_buffer *eb, \ |
| u##bits val) \ |
| { \ |
| type *p = page_address(eb->first_page); \ |
| 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 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)); |
| } |
| |
| /* 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); |
| |
| static inline struct btrfs_timespec * |
| btrfs_inode_atime(struct btrfs_inode_item *inode_item) |
| { |
| unsigned long ptr = (unsigned long)inode_item; |
| ptr += offsetof(struct btrfs_inode_item, atime); |
| return (struct btrfs_timespec *)ptr; |
| } |
| |
| static inline struct btrfs_timespec * |
| btrfs_inode_mtime(struct btrfs_inode_item *inode_item) |
| { |
| unsigned long ptr = (unsigned long)inode_item; |
| ptr += offsetof(struct btrfs_inode_item, mtime); |
| return (struct btrfs_timespec *)ptr; |
| } |
| |
| static inline struct btrfs_timespec * |
| btrfs_inode_ctime(struct btrfs_inode_item *inode_item) |
| { |
| unsigned long ptr = (unsigned long)inode_item; |
| ptr += offsetof(struct btrfs_inode_item, ctime); |
| return (struct btrfs_timespec *)ptr; |
| } |
| |
| BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64); |
| BTRFS_SETGET_FUNCS(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); |
| } |
| |
| BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64); |
| BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item, |
| generation, 64); |
| BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64); |
| |
| BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32); |
| |
| |
| BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8); |
| |
| static inline void btrfs_tree_block_key(struct extent_buffer *eb, |
| struct btrfs_tree_block_info *item, |
| struct btrfs_disk_key *key) |
| { |
| read_eb_member(eb, item, struct btrfs_tree_block_info, key, key); |
| } |
| |
| static inline void btrfs_set_tree_block_key(struct extent_buffer *eb, |
| struct btrfs_tree_block_info *item, |
| struct btrfs_disk_key *key) |
| { |
| write_eb_member(eb, item, struct btrfs_tree_block_info, key, key); |
| } |
| |
| BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref, |
| root, 64); |
| BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref, |
| objectid, 64); |
| BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref, |
| offset, 64); |
| BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref, |
| count, 32); |
| |
| BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref, |
| count, 32); |
| |
| BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref, |
| type, 8); |
| BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref, |
| offset, 64); |
| |
| static inline u32 btrfs_extent_inline_ref_size(int type) |
| { |
| if (type == BTRFS_TREE_BLOCK_REF_KEY || |
| type == BTRFS_SHARED_BLOCK_REF_KEY) |
| return sizeof(struct btrfs_extent_inline_ref); |
| if (type == BTRFS_SHARED_DATA_REF_KEY) |
| return sizeof(struct btrfs_shared_data_ref) + |
| sizeof(struct btrfs_extent_inline_ref); |
| if (type == BTRFS_EXTENT_DATA_REF_KEY) |
| return sizeof(struct btrfs_extent_data_ref) + |
| offsetof(struct btrfs_extent_inline_ref, offset); |
| BUG(); |
| return 0; |
| } |
| |
| BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64); |
| BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0, |
| generation, 64); |
| BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64); |
| BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 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; |
| } |
| |
| void btrfs_node_key(struct extent_buffer *eb, |
| struct btrfs_disk_key *disk_key, int nr); |
| |
| static inline void btrfs_set_node_key(struct extent_buffer *eb, |
| struct btrfs_disk_key *disk_key, int nr) |
| { |
| unsigned long ptr; |
| ptr = btrfs_node_key_ptr_offset(nr); |
| write_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); |
| } |
| |
| static inline void btrfs_set_item_key(struct extent_buffer *eb, |
| struct btrfs_disk_key *disk_key, int nr) |
| { |
| struct btrfs_item *item = btrfs_item_nr(eb, nr); |
| write_eb_member(eb, item, struct btrfs_item, key, disk_key); |
| } |
| |
| BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64); |
| |
| /* |
| * 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); |
| } |
| |
| static inline void btrfs_set_dir_item_key(struct extent_buffer *eb, |
| struct btrfs_dir_item *item, |
| struct btrfs_disk_key *key) |
| { |
| write_eb_member(eb, item, struct btrfs_dir_item, location, key); |
| } |
| |
| BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header, |
| num_entries, 64); |
| BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header, |
| num_bitmaps, 64); |
| BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header, |
| generation, 64); |
| |
| static inline void btrfs_free_space_key(struct extent_buffer *eb, |
| struct btrfs_free_space_header *h, |
| struct btrfs_disk_key *key) |
| { |
| read_eb_member(eb, h, struct btrfs_free_space_header, location, key); |
| } |
| |
| static inline void btrfs_set_free_space_key(struct extent_buffer *eb, |
| struct btrfs_free_space_header *h, |
| struct btrfs_disk_key *key) |
| { |
| write_eb_member(eb, h, struct btrfs_free_space_header, 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); |
| |
| static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag) |
| { |
| return (btrfs_header_flags(eb) & flag) == flag; |
| } |
| |
| static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag) |
| { |
| u64 flags = btrfs_header_flags(eb); |
| btrfs_set_header_flags(eb, flags | flag); |
| return (flags & flag) == flag; |
| } |
| |
| static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag) |
| { |
| u64 flags = btrfs_header_flags(eb); |
| btrfs_set_header_flags(eb, flags & ~flag); |
| return (flags & flag) == flag; |
| } |
| |
| static inline int btrfs_header_backref_rev(struct extent_buffer *eb) |
| { |
| u64 flags = btrfs_header_flags(eb); |
| return flags >> BTRFS_BACKREF_REV_SHIFT; |
| } |
| |
| static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb, |
| int rev) |
| { |
| u64 flags = btrfs_header_flags(eb); |
| flags &= ~BTRFS_BACKREF_REV_MASK; |
| flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT; |
| btrfs_set_header_flags(eb, flags); |
| } |
| |
| static inline u8 *btrfs_header_fsid(struct extent_buffer *eb) |
| { |
| unsigned long ptr = offsetof(struct btrfs_header, fsid); |
| return (u8 *)ptr; |
| } |
| |
| static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb) |
| { |
| unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid); |
| return (u8 *)ptr; |
| } |
| |
| static inline int btrfs_is_leaf(struct extent_buffer *eb) |
| { |
| return btrfs_header_level(eb) == 0; |
| } |
| |
| /* 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); |
| |
| static inline bool btrfs_root_readonly(struct btrfs_root *root) |
| { |
| return root->root_item.flags & BTRFS_ROOT_SUBVOL_RDONLY; |
| } |
| |
| /* struct btrfs_root_backup */ |
| BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup, |
| tree_root, 64); |
| BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup, |
| tree_root_gen, 64); |
| BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup, |
| tree_root_level, 8); |
| |
| BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup, |
| chunk_root, 64); |
| BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup, |
| chunk_root_gen, 64); |
| BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup, |
| chunk_root_level, 8); |
| |
| BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup, |
| extent_root, 64); |
| BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup, |
| extent_root_gen, 64); |
| BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup, |
| extent_root_level, 8); |
| |
| BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup, |
| fs_root, 64); |
| BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup, |
| fs_root_gen, 64); |
| BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup, |
| fs_root_level, 8); |
| |
| BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup, |
| dev_root, 64); |
| BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup, |
| dev_root_gen, 64); |
| BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup, |
| dev_root_level, 8); |
| |
| BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup, |
| csum_root, 64); |
| BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup, |
| csum_root_gen, 64); |
| BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup, |
| csum_root_level, 8); |
| BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup, |
| total_bytes, 64); |
| BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup, |
| bytes_used, 64); |
| BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup, |
| num_devices, 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_ro_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); |
| BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block, |
| cache_generation, 64); |
| |
| 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 struct btrfs_root *btrfs_sb(struct super_block *sb) |
| { |
| return sb->s_fs_info; |
| } |
| |
| static inline u32 btrfs_level_size(struct btrfs_root *root, int level) |
| { |
| if (level == 0) |
| return root->leafsize; |
| return root->nodesize; |
| } |
| |
| /* 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))) |
| |
| static inline struct dentry *fdentry(struct file *file) |
| { |
| return file->f_path.dentry; |
| } |
| |
| static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info) |
| { |
| return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) && |
| (space_info->flags & BTRFS_BLOCK_GROUP_DATA)); |
| } |
| |
| static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping) |
| { |
| return mapping_gfp_mask(mapping) & ~__GFP_FS; |
| } |
| |
| /* extent-tree.c */ |
| static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root, |
| unsigned num_items) |
| { |
| return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) * |
| 3 * num_items; |
| } |
| |
| /* |
| * Doing a truncate won't result in new nodes or leaves, just what we need for |
| * COW. |
| */ |
| static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_root *root, |
| unsigned num_items) |
| { |
| return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) * |
| num_items; |
| } |
| |
| void btrfs_put_block_group(struct btrfs_block_group_cache *cache); |
| int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, unsigned long count); |
| int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len); |
| int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, u64 bytenr, |
| u64 num_bytes, u64 *refs, u64 *flags); |
| int btrfs_pin_extent(struct btrfs_root *root, |
| u64 bytenr, u64 num, int reserved); |
| int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| u64 bytenr, u64 num_bytes); |
| int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| u64 objectid, u64 offset, u64 bytenr); |
| struct btrfs_block_group_cache *btrfs_lookup_block_group( |
| struct btrfs_fs_info *info, |
| u64 bytenr); |
| void btrfs_put_block_group(struct btrfs_block_group_cache *cache); |
| u64 btrfs_find_block_group(struct btrfs_root *root, |
| u64 search_start, u64 search_hint, int owner); |
| struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, u32 blocksize, |
| u64 parent, u64 root_objectid, |
| struct btrfs_disk_key *key, int level, |
| u64 hint, u64 empty_size); |
| void btrfs_free_tree_block(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct extent_buffer *buf, |
| u64 parent, int last_ref); |
| struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| u64 bytenr, u32 blocksize, |
| int level); |
| int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| u64 root_objectid, u64 owner, |
| u64 offset, struct btrfs_key *ins); |
| int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| u64 root_objectid, u64 owner, u64 offset, |
| struct btrfs_key *ins); |
| int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| u64 num_bytes, u64 min_alloc_size, |
| u64 empty_size, u64 hint_byte, |
| u64 search_end, struct btrfs_key *ins, |
| u64 data); |
| int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| struct extent_buffer *buf, int full_backref); |
| int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| struct extent_buffer *buf, int full_backref); |
| int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| u64 bytenr, u64 num_bytes, u64 flags, |
| int is_data); |
| int btrfs_free_extent(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| u64 bytenr, u64 num_bytes, u64 parent, |
| u64 root_objectid, u64 owner, u64 offset); |
| |
| int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len); |
| int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, |
| u64 start, u64 len); |
| int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root); |
| int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root); |
| int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| u64 bytenr, u64 num_bytes, u64 parent, |
| u64 root_objectid, u64 owner, u64 offset); |
| |
| int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root); |
| int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr); |
| int btrfs_free_block_groups(struct btrfs_fs_info *info); |
| int btrfs_read_block_groups(struct btrfs_root *root); |
| int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr); |
| int btrfs_make_block_group(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, u64 bytes_used, |
| u64 type, u64 chunk_objectid, u64 chunk_offset, |
| u64 size); |
| int btrfs_remove_block_group(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, u64 group_start); |
| u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags); |
| u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data); |
| void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde); |
| void btrfs_clear_space_info_full(struct btrfs_fs_info *info); |
| int btrfs_check_data_free_space(struct inode *inode, u64 bytes); |
| void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes); |
| void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root); |
| int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, |
| struct inode *inode); |
| void btrfs_orphan_release_metadata(struct inode *inode); |
| int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans, |
| struct btrfs_pending_snapshot *pending); |
| int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes); |
| void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes); |
| int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes); |
| void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes); |
| void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv); |
| struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root); |
| void btrfs_free_block_rsv(struct btrfs_root *root, |
| struct btrfs_block_rsv *rsv); |
| int btrfs_block_rsv_add(struct btrfs_root *root, |
| struct btrfs_block_rsv *block_rsv, |
| u64 num_bytes); |
| int btrfs_block_rsv_add_noflush(struct btrfs_root *root, |
| struct btrfs_block_rsv *block_rsv, |
| u64 num_bytes); |
| int btrfs_block_rsv_check(struct btrfs_root *root, |
| struct btrfs_block_rsv *block_rsv, int min_factor); |
| int btrfs_block_rsv_refill(struct btrfs_root *root, |
| struct btrfs_block_rsv *block_rsv, |
| u64 min_reserved); |
| int btrfs_block_rsv_refill_noflush(struct btrfs_root *root, |
| struct btrfs_block_rsv *block_rsv, |
| u64 min_reserved); |
| int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, |
| struct btrfs_block_rsv *dst_rsv, |
| u64 num_bytes); |
| void btrfs_block_rsv_release(struct btrfs_root *root, |
| struct btrfs_block_rsv *block_rsv, |
| u64 num_bytes); |
| int btrfs_set_block_group_ro(struct btrfs_root *root, |
| struct btrfs_block_group_cache *cache); |
| int btrfs_set_block_group_rw(struct btrfs_root *root, |
| struct btrfs_block_group_cache *cache); |
| void btrfs_put_block_group_cache(struct btrfs_fs_info *info); |
| u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo); |
| int btrfs_error_unpin_extent_range(struct btrfs_root *root, |
| u64 start, u64 end); |
| int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr, |
| u64 num_bytes, u64 *actual_bytes); |
| int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, u64 type); |
| int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range); |
| |
| int btrfs_init_space_info(struct btrfs_fs_info *fs_info); |
| /* ctree.c */ |
| int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key, |
| int level, int *slot); |
| int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2); |
| int btrfs_previous_item(struct btrfs_root *root, |
| struct btrfs_path *path, u64 min_objectid, |
| int type); |
| int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, struct btrfs_path *path, |
| struct btrfs_key *new_key); |
| struct extent_buffer *btrfs_root_node(struct btrfs_root *root); |
| struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root); |
| int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path, |
| struct btrfs_key *key, int lowest_level, |
| int cache_only, u64 min_trans); |
| int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key, |
| struct btrfs_key *max_key, |
| struct btrfs_path *path, int cache_only, |
| u64 min_trans); |
| int btrfs_cow_block(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, struct extent_buffer *buf, |
| struct extent_buffer *parent, int parent_slot, |
| struct extent_buffer **cow_ret); |
| int btrfs_copy_root(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct extent_buffer *buf, |
| struct extent_buffer **cow_ret, u64 new_root_objectid); |
| int btrfs_block_can_be_shared(struct btrfs_root *root, |
| struct extent_buffer *buf); |
| int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root |
| *root, struct btrfs_path *path, u32 data_size); |
| int btrfs_truncate_item(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| u32 new_size, int from_end); |
| int btrfs_split_item(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| struct btrfs_key *new_key, |
| unsigned long split_offset); |
| int btrfs_duplicate_item(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| struct btrfs_key *new_key); |
| int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root |
| *root, struct btrfs_key *key, struct btrfs_path *p, int |
| ins_len, int cow); |
| int btrfs_realloc_node(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, struct extent_buffer *parent, |
| int start_slot, int cache_only, u64 *last_ret, |
| struct btrfs_key *progress); |
| void btrfs_release_path(struct btrfs_path *p); |
| struct btrfs_path *btrfs_alloc_path(void); |
| void btrfs_free_path(struct btrfs_path *p); |
| void btrfs_set_path_blocking(struct btrfs_path *p); |
| void btrfs_clear_path_blocking(struct btrfs_path *p, |
| struct extent_buffer *held, int held_rw); |
| void btrfs_unlock_up_safe(struct btrfs_path *p, int level); |
| |
| int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| struct btrfs_path *path, int slot, int nr); |
| static inline int btrfs_del_item(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path) |
| { |
| return btrfs_del_items(trans, root, path, path->slots[0], 1); |
| } |
| |
| int setup_items_for_insert(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, struct btrfs_path *path, |
| struct btrfs_key *cpu_key, u32 *data_size, |
| u32 total_data, u32 total_size, int nr); |
| int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root |
| *root, struct btrfs_key *key, void *data, u32 data_size); |
| int btrfs_insert_empty_items(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| struct btrfs_key *cpu_key, u32 *data_size, int nr); |
| |
| static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| struct btrfs_key *key, |
| u32 data_size) |
| { |
| return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1); |
| } |
| |
| int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path); |
| int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path); |
| int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf); |
| void btrfs_drop_snapshot(struct btrfs_root *root, |
| struct btrfs_block_rsv *block_rsv, int update_ref); |
| int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct extent_buffer *node, |
| struct extent_buffer *parent); |
| static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info) |
| { |
| /* |
| * Get synced with close_ctree() |
| */ |
| smp_mb(); |
| return fs_info->closing; |
| } |
| static inline void free_fs_info(struct btrfs_fs_info *fs_info) |
| { |
| kfree(fs_info->delayed_root); |
| kfree(fs_info->extent_root); |
| kfree(fs_info->tree_root); |
| kfree(fs_info->chunk_root); |
| kfree(fs_info->dev_root); |
| kfree(fs_info->csum_root); |
| kfree(fs_info->super_copy); |
| kfree(fs_info->super_for_commit); |
| kfree(fs_info); |
| } |
| |
| /* root-item.c */ |
| int btrfs_find_root_ref(struct btrfs_root *tree_root, |
| struct btrfs_path *path, |
| u64 root_id, u64 ref_id); |
| int btrfs_add_root_ref(struct btrfs_trans_handle *trans, |
| struct btrfs_root *tree_root, |
| u64 root_id, u64 ref_id, u64 dirid, u64 sequence, |
| const char *name, int name_len); |
| int btrfs_del_root_ref(struct btrfs_trans_handle *trans, |
| struct btrfs_root *tree_root, |
| u64 root_id, u64 ref_id, u64 dirid, u64 *sequence, |
| const char *name, int name_len); |
| int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| struct btrfs_key *key); |
| int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root |
| *root, struct btrfs_key *key, struct btrfs_root_item |
| *item); |
| int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root |
| *root, struct btrfs_key *key, struct btrfs_root_item |
| *item); |
| int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct |
| btrfs_root_item *item, struct btrfs_key *key); |
| int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid); |
| int btrfs_find_orphan_roots(struct btrfs_root *tree_root); |
| void btrfs_set_root_node(struct btrfs_root_item *item, |
| struct extent_buffer *node); |
| void btrfs_check_and_init_root_item(struct btrfs_root_item *item); |
| |
| /* dir-item.c */ |
| int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, const char *name, |
| int name_len, struct inode *dir, |
| struct btrfs_key *location, u8 type, u64 index); |
| struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, u64 dir, |
| const char *name, int name_len, |
| int mod); |
| struct btrfs_dir_item * |
| btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, u64 dir, |
| u64 objectid, const char *name, int name_len, |
| int mod); |
| struct btrfs_dir_item * |
| btrfs_search_dir_index_item(struct btrfs_root *root, |
| struct btrfs_path *path, u64 dirid, |
| const char *name, int name_len); |
| struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root, |
| struct btrfs_path *path, |
| const char *name, int name_len); |
| int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| struct btrfs_dir_item *di); |
| int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, u64 objectid, |
| const char *name, u16 name_len, |
| const void *data, u16 data_len); |
| struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, u64 dir, |
| const char *name, u16 name_len, |
| int mod); |
| int verify_dir_item(struct btrfs_root *root, |
| struct extent_buffer *leaf, |
| struct btrfs_dir_item *dir_item); |
| |
| /* orphan.c */ |
| int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, u64 offset); |
| int btrfs_del_orphan_item(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, u64 offset); |
| int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset); |
| |
| /* inode-item.c */ |
| int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| const char *name, int name_len, |
| u64 inode_objectid, u64 ref_objectid, u64 index); |
| int btrfs_del_inode_ref(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| const char *name, int name_len, |
| u64 inode_objectid, u64 ref_objectid, u64 *index); |
| struct btrfs_inode_ref * |
| btrfs_lookup_inode_ref(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| const char *name, int name_len, |
| u64 inode_objectid, u64 ref_objectid, int mod); |
| int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, u64 objectid); |
| int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root |
| *root, struct btrfs_path *path, |
| struct btrfs_key *location, int mod); |
| |
| /* file-item.c */ |
| int btrfs_del_csums(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, u64 bytenr, u64 len); |
| int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode, |
| struct bio *bio, u32 *dst); |
| int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode, |
| struct bio *bio, u64 logical_offset, u32 *dst); |
| int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| u64 objectid, u64 pos, |
| u64 disk_offset, u64 disk_num_bytes, |
| u64 num_bytes, u64 offset, u64 ram_bytes, |
| u8 compression, u8 encryption, u16 other_encoding); |
| int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, u64 objectid, |
| u64 bytenr, int mod); |
| int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_ordered_sum *sums); |
| int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode, |
| struct bio *bio, u64 file_start, int contig); |
| struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| u64 bytenr, int cow); |
| int btrfs_csum_truncate(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, struct btrfs_path *path, |
| u64 isize); |
| int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, |
| struct list_head *list, int search_commit); |
| /* inode.c */ |
| struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page, |
| size_t pg_offset, u64 start, u64 len, |
| int create); |
| |
| /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */ |
| #if defined(ClearPageFsMisc) && !defined(ClearPageChecked) |
| #define ClearPageChecked ClearPageFsMisc |
| #define SetPageChecked SetPageFsMisc |
| #define PageChecked PageFsMisc |
| #endif |
| |
| /* This forces readahead on a given range of bytes in an inode */ |
| static inline void btrfs_force_ra(struct address_space *mapping, |
| struct file_ra_state *ra, struct file *file, |
| pgoff_t offset, unsigned long req_size) |
| { |
| page_cache_sync_readahead(mapping, ra, file, offset, req_size); |
| } |
| |
| struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry); |
| int btrfs_set_inode_index(struct inode *dir, u64 *index); |
| int btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct inode *dir, struct inode *inode, |
| const char *name, int name_len); |
| int btrfs_add_link(struct btrfs_trans_handle *trans, |
| struct inode *parent_inode, struct inode *inode, |
| const char *name, int name_len, int add_backref, u64 index); |
| int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct inode *dir, u64 objectid, |
| const char *name, int name_len); |
| int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct inode *inode, u64 new_size, |
| u32 min_type); |
| |
| int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput); |
| int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end, |
| struct extent_state **cached_state); |
| int btrfs_writepages(struct address_space *mapping, |
| struct writeback_control *wbc); |
| int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, |
| struct btrfs_root *new_root, u64 new_dirid); |
| int btrfs_merge_bio_hook(struct page *page, unsigned long offset, |
| size_t size, struct bio *bio, unsigned long bio_flags); |
| |
| int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); |
| int btrfs_readpage(struct file *file, struct page *page); |
| void btrfs_evict_inode(struct inode *inode); |
| int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc); |
| int btrfs_dirty_inode(struct inode *inode); |
| int btrfs_update_time(struct file *file); |
| struct inode *btrfs_alloc_inode(struct super_block *sb); |
| void btrfs_destroy_inode(struct inode *inode); |
| int btrfs_drop_inode(struct inode *inode); |
| int btrfs_init_cachep(void); |
| void btrfs_destroy_cachep(void); |
| long btrfs_ioctl_trans_end(struct file *file); |
| struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, |
| struct btrfs_root *root, int *was_new); |
| struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
| size_t pg_offset, u64 start, u64 end, |
| int create); |
| int btrfs_update_inode(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct inode *inode); |
| int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode); |
| int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode); |
| int btrfs_orphan_cleanup(struct btrfs_root *root); |
| void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root); |
| int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size); |
| int btrfs_invalidate_inodes(struct btrfs_root *root); |
| void btrfs_add_delayed_iput(struct inode *inode); |
| void btrfs_run_delayed_iputs(struct btrfs_root *root); |
| int btrfs_prealloc_file_range(struct inode *inode, int mode, |
| u64 start, u64 num_bytes, u64 min_size, |
| loff_t actual_len, u64 *alloc_hint); |
| int btrfs_prealloc_file_range_trans(struct inode *inode, |
| struct btrfs_trans_handle *trans, int mode, |
| u64 start, u64 num_bytes, u64 min_size, |
| loff_t actual_len, u64 *alloc_hint); |
| extern const struct dentry_operations btrfs_dentry_operations; |
| |
| /* ioctl.c */ |
| long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
| void btrfs_update_iflags(struct inode *inode); |
| void btrfs_inherit_iflags(struct inode *inode, struct inode *dir); |
| int btrfs_defrag_file(struct inode *inode, struct file *file, |
| struct btrfs_ioctl_defrag_range_args *range, |
| u64 newer_than, unsigned long max_pages); |
| /* file.c */ |
| int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans, |
| struct inode *inode); |
| int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info); |
| int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync); |
| int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end, |
| int skip_pinned); |
| extern const struct file_operations btrfs_file_operations; |
| int btrfs_drop_extents(struct btrfs_trans_handle *trans, struct inode *inode, |
| u64 start, u64 end, u64 *hint_byte, int drop_cache); |
| int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, |
| struct inode *inode, u64 start, u64 end); |
| int btrfs_release_file(struct inode *inode, struct file *file); |
| void btrfs_drop_pages(struct page **pages, size_t num_pages); |
| int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode, |
| struct page **pages, size_t num_pages, |
| loff_t pos, size_t write_bytes, |
| struct extent_state **cached); |
| |
| /* tree-defrag.c */ |
| int btrfs_defrag_leaves(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, int cache_only); |
| |
| /* sysfs.c */ |
| int btrfs_init_sysfs(void); |
| void btrfs_exit_sysfs(void); |
| |
| /* xattr.c */ |
| ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size); |
| |
| /* super.c */ |
| int btrfs_parse_options(struct btrfs_root *root, char *options); |
| int btrfs_sync_fs(struct super_block *sb, int wait); |
| void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, |
| unsigned int line, int errno); |
| |
| #define btrfs_std_error(fs_info, errno) \ |
| do { \ |
| if ((errno)) \ |
| __btrfs_std_error((fs_info), __func__, __LINE__, (errno));\ |
| } while (0) |
| |
| /* acl.c */ |
| #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
| struct posix_acl *btrfs_get_acl(struct inode *inode, int type); |
| int btrfs_init_acl(struct btrfs_trans_handle *trans, |
| struct inode *inode, struct inode *dir); |
| int btrfs_acl_chmod(struct inode *inode); |
| #else |
| #define btrfs_get_acl NULL |
| static inline int btrfs_init_acl(struct btrfs_trans_handle *trans, |
| struct inode *inode, struct inode *dir) |
| { |
| return 0; |
| } |
| static inline int btrfs_acl_chmod(struct inode *inode) |
| { |
| return 0; |
| } |
| #endif |
| |
| /* relocation.c */ |
| int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start); |
| int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root); |
| int btrfs_update_reloc_root(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root); |
| int btrfs_recover_relocation(struct btrfs_root *root); |
| int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len); |
| void btrfs_reloc_cow_block(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, struct extent_buffer *buf, |
| struct extent_buffer *cow); |
| void btrfs_reloc_pre_snapshot(struct btrfs_trans_handle *trans, |
| struct btrfs_pending_snapshot *pending, |
| u64 *bytes_to_reserve); |
| void btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, |
| struct btrfs_pending_snapshot *pending); |
| |
| /* scrub.c */ |
| int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end, |
| struct btrfs_scrub_progress *progress, int readonly); |
| int btrfs_scrub_pause(struct btrfs_root *root); |
| int btrfs_scrub_pause_super(struct btrfs_root *root); |
| int btrfs_scrub_continue(struct btrfs_root *root); |
| int btrfs_scrub_continue_super(struct btrfs_root *root); |
| int btrfs_scrub_cancel(struct btrfs_root *root); |
| int btrfs_scrub_cancel_dev(struct btrfs_root *root, struct btrfs_device *dev); |
| int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid); |
| int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, |
| struct btrfs_scrub_progress *progress); |
| |
| /* reada.c */ |
| struct reada_control { |
| struct btrfs_root *root; /* tree to prefetch */ |
| struct btrfs_key key_start; |
| struct btrfs_key key_end; /* exclusive */ |
| atomic_t elems; |
| struct kref refcnt; |
| wait_queue_head_t wait; |
| }; |
| struct reada_control *btrfs_reada_add(struct btrfs_root *root, |
| struct btrfs_key *start, struct btrfs_key *end); |
| int btrfs_reada_wait(void *handle); |
| void btrfs_reada_detach(void *handle); |
| int btree_readahead_hook(struct btrfs_root *root, struct extent_buffer *eb, |
| u64 start, int err); |
| |
| #endif |