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btrfs-progs/kernel-shared/ctree.h
Qu Wenruo afae10ddb6 btrfs-progs: constify the name parameter of btrfs_add_link() 
The name is never touched, thus it should be const.

Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Qu Wenruo <wqu@suse.com>
2024-08-14 23:58:24 +02:00

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/*
* 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_H__
#define __BTRFS_CTREE_H__
#include "kerncompat.h"
#include <stdbool.h>
#include <stddef.h>
#include "kernel-lib/list.h"
#include "kernel-lib/bitops.h"
#include "kernel-lib/rbtree_types.h"
#include "kernel-shared/uapi/btrfs.h"
#include "kernel-shared/uapi/btrfs_tree.h"
#include "kernel-shared/extent_io.h"
#include "kernel-shared/accessors.h"
#include "kernel-shared/extent-io-tree.h"
#include "kernel-shared/locking.h"
#include "crypto/crc32c.h"
#include "common/extent-cache.h"
struct btrfs_root;
struct btrfs_trans_handle;
struct btrfs_free_space_ctl;
/*
* Fake signature for an unfinalized filesystem, which only has barebone tree
* structures (normally 6 near empty trees, on SINGLE meta/sys temporary chunks)
*
* ascii !BHRfS_M, no null
*/
#define BTRFS_MAGIC_TEMPORARY 0x4D5F536652484221ULL
#define BTRFS_MAX_MIRRORS 3
struct btrfs_mapping_tree {
struct cache_tree cache_tree;
};
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);
}
static inline u32 __BTRFS_LEAF_DATA_SIZE(u32 nodesize)
{
return nodesize - sizeof(struct btrfs_header);
}
#define BTRFS_LEAF_DATA_SIZE(fs_info) (fs_info->leaf_data_size)
#define BTRFS_SUPER_INFO_OFFSET (65536)
#define BTRFS_SUPER_INFO_SIZE (4096)
/*
* The FREE_SPACE_TREE and FREE_SPACE_TREE_VALID compat_ro bits must not be
* added here until read-write support for the free space tree is implemented in
* btrfs-progs.
*/
#define BTRFS_FEATURE_COMPAT_RO_SUPP \
(BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \
BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID | \
BTRFS_FEATURE_COMPAT_RO_VERITY | \
BTRFS_FEATURE_COMPAT_RO_BLOCK_GROUP_TREE)
#if EXPERIMENTAL
#define BTRFS_FEATURE_INCOMPAT_SUPP \
(BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \
BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
BTRFS_FEATURE_INCOMPAT_RAID56 | \
BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
BTRFS_FEATURE_INCOMPAT_RAID1C34 | \
BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \
BTRFS_FEATURE_INCOMPAT_ZONED | \
BTRFS_FEATURE_INCOMPAT_EXTENT_TREE_V2 | \
BTRFS_FEATURE_INCOMPAT_RAID_STRIPE_TREE | \
BTRFS_FEATURE_INCOMPAT_SIMPLE_QUOTA)
#else
#define BTRFS_FEATURE_INCOMPAT_SUPP \
(BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \
BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
BTRFS_FEATURE_INCOMPAT_RAID56 | \
BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
BTRFS_FEATURE_INCOMPAT_RAID1C34 | \
BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \
BTRFS_FEATURE_INCOMPAT_ZONED | \
BTRFS_FEATURE_INCOMPAT_RAID_STRIPE_TREE | \
BTRFS_FEATURE_INCOMPAT_SIMPLE_QUOTA)
#endif
/*
* 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.
*/
enum {
READA_NONE,
READA_BACK,
READA_FORWARD,
/*
* Similar to READA_FORWARD but unlike it:
*
* 1) It will trigger readahead even for leaves that are not close to
* each other on disk;
* 2) It also triggers readahead for nodes;
* 3) During a search, even when a node or leaf is already in memory, it
* will still trigger readahead for other nodes and leaves that follow
* it.
*
* This is meant to be used only when we know we are iterating over the
* entire tree or a very large part of it.
*/
READA_FORWARD_ALWAYS,
};
/*
* 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];
/* The kernel locking scheme is not done in userspace. */
u8 locks[BTRFS_MAX_LEVEL];
u8 reada;
/* keep some upper locks as we walk down */
u8 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 search_commit_root:1;
unsigned int need_commit_sem:1;
unsigned int skip_release_on_error:1;
/*
* Indicate that new item (btrfs_search_slot) is extending already
* existing item and ins_len contains only the data size and not item
* header (ie. sizeof(struct btrfs_item) is not included).
*/
unsigned int search_for_extension:1;
/* Stop search if any locks need to be taken (for read) */
unsigned int nowait:1;
unsigned int skip_check_block:1;
};
#define BTRFS_MAX_EXTENT_ITEM_SIZE(r) \
((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
sizeof(struct btrfs_item))
#define BTRFS_MAX_EXTENT_SIZE 128UL * 1024 * 1024
/*
* We don't want to overwrite 1M at the beginning of device, even though
* there is our 1st superblock at 64k. Some possible reasons:
* - the first 64k blank is useful for some boot loader/manager
* - the first 1M could be scratched by buggy partitioner or somesuch
*/
#define BTRFS_BLOCK_RESERVED_1M_FOR_SUPER ((u64)1 * 1024 * 1024)
enum btrfs_raid_types {
BTRFS_RAID_RAID10,
BTRFS_RAID_RAID1,
BTRFS_RAID_DUP,
BTRFS_RAID_RAID0,
BTRFS_RAID_SINGLE,
BTRFS_RAID_RAID5,
BTRFS_RAID_RAID6,
BTRFS_RAID_RAID1C3,
BTRFS_RAID_RAID1C4,
BTRFS_NR_RAID_TYPES
};
/*
* GLOBAL_RSV does not exist as a on-disk block group type and is used
* internally for exporting info about global block reserve from space infos
*/
#define BTRFS_SPACE_INFO_GLOBAL_RSV (1ULL << 49)
#define BTRFS_QGROUP_LEVEL_SHIFT 48
static inline u64 btrfs_qgroup_subvolid(u64 qgroupid)
{
return qgroupid & ((1ULL << BTRFS_QGROUP_LEVEL_SHIFT) - 1);
}
struct btrfs_space_info {
u64 flags;
u64 total_bytes;
/*
* Space already used.
* Only accounting space in current extent tree, thus delayed ref
* won't be accounted here.
*/
u64 bytes_used;
/*
* Space being pinned down.
* So extent allocator will not try to allocate space from them.
*
* For cases like extents being freed in current transaction, or
* manually pinned bytes for re-initializing certain trees.
*/
u64 bytes_pinned;
/*
* Space being reserved.
* Space has already being reserved but not yet reach extent tree.
*
* New tree blocks allocated in current transaction goes here.
*/
u64 bytes_reserved;
int full;
struct list_head list;
};
struct btrfs_block_group {
struct btrfs_space_info *space_info;
struct btrfs_free_space_ctl *free_space_ctl;
u64 start;
u64 length;
u64 used;
u64 bytes_super;
u64 pinned;
u64 flags;
int cached;
int ro;
/*
* If the free space extent count exceeds this number, convert the block
* group to bitmaps.
*/
u32 bitmap_high_thresh;
/*
* If the free space extent count drops below this number, convert the
* block group back to extents.
*/
u32 bitmap_low_thresh;
/* Block group cache stuff */
struct rb_node cache_node;
/* For dirty block groups */
struct list_head dirty_list;
/*
* Allocation offset for the block group to implement sequential
* allocation. This is used only with ZONED mode enabled.
*/
u64 alloc_offset;
u64 write_offset;
u64 global_root_id;
};
struct btrfs_device;
struct btrfs_fs_devices;
struct btrfs_fs_info {
u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
u8 *new_chunk_tree_uuid;
struct btrfs_root *fs_root;
struct btrfs_root *tree_root;
struct btrfs_root *chunk_root;
struct btrfs_root *dev_root;
struct btrfs_root *quota_root;
struct btrfs_root *uuid_root;
struct btrfs_root *block_group_root;
struct btrfs_root *stripe_root;
struct rb_root global_roots_tree;
struct rb_root fs_root_tree;
/* the log root tree is a directory of all the other log roots */
struct btrfs_root *log_root_tree;
struct cache_tree extent_cache;
u64 max_cache_size;
u64 cache_size;
struct list_head lru;
struct extent_io_tree dirty_buffers;
struct extent_io_tree free_space_cache;
struct extent_io_tree pinned_extents;
struct extent_io_tree extent_ins;
struct extent_io_tree *excluded_extents;
spinlock_t trans_lock;
struct rw_semaphore commit_root_sem;
struct rb_root block_group_cache_tree;
/* logical->physical extent mapping */
struct btrfs_mapping_tree mapping_tree;
u64 generation;
u64 last_trans_committed;
u64 avail_data_alloc_bits;
u64 avail_metadata_alloc_bits;
u64 avail_system_alloc_bits;
u64 data_alloc_profile;
u64 metadata_alloc_profile;
u64 system_alloc_profile;
struct btrfs_trans_handle *running_transaction;
struct btrfs_super_block *super_copy;
u64 super_bytenr;
u64 total_pinned;
u64 nr_global_roots;
struct list_head dirty_cowonly_roots;
struct list_head recow_ebs;
struct btrfs_fs_devices *fs_devices;
struct list_head space_info;
unsigned int system_allocs:1;
unsigned int readonly:1;
unsigned int on_restoring:1;
unsigned int is_chunk_recover:1;
unsigned int quota_enabled:1;
unsigned int suppress_check_block_errors:1;
unsigned int ignore_fsid_mismatch:1;
/* Don't verify checksums at all */
unsigned int skip_csum_check:1;
unsigned int ignore_chunk_tree_error:1;
unsigned int avoid_meta_chunk_alloc:1;
unsigned int avoid_sys_chunk_alloc:1;
unsigned int finalize_on_close:1;
unsigned int hide_names:1;
unsigned int allow_transid_mismatch:1;
unsigned int skip_leaf_item_checks:1;
unsigned int rebuilding_extent_tree:1;
int transaction_aborted;
int (*free_extent_hook)(u64 bytenr, u64 num_bytes, u64 parent,
u64 root_objectid, u64 owner, u64 offset,
int refs_to_drop);
struct cache_tree *fsck_extent_cache;
struct cache_tree *corrupt_blocks;
/*
* For converting to/from bg tree feature, this records the bytenr
* of the last processed block group item.
*
* Any new block group item after this bytenr is using the target
* block group item format. (e.g. if converting to bg tree, bg item
* after this bytenr should go into block group tree).
*
* Thus the number should decrease as our convert progress goes.
*/
u64 last_converted_bg_bytenr;
/* Cached block sizes */
u32 nodesize;
u32 sectorsize;
u32 stripesize;
u32 leaf_data_size;
/*
* For open_ctree_fs_info() to hold the initial fd until close.
*
* For writeable open_ctree_fs_info() call, we should not close
* the fd until the fs_info is properly closed, or it will trigger
* udev scan while our fs is not properly initialized.
*/
int initial_fd;
u16 csum_type;
u16 csum_size;
/*
* Zone size > 0 when in ZONED mode, otherwise it's used for a check
* if the mode is enabled
*/
union {
u64 zone_size;
u64 zoned;
};
struct super_block *sb;
};
static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info)
{
return fs_info->zoned != 0;
}
static inline bool btrfs_is_testing(const struct btrfs_fs_info *fs_info)
{
return false;
}
/*
* The state of btrfs root
*/
enum {
/*
* 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
*/
BTRFS_ROOT_IN_TRANS_SETUP,
/*
* Set if tree blocks of this root can be shared by other roots.
* Only subvolume trees and their reloc trees have this bit set.
* Conflicts with TRACK_DIRTY bit.
*
* This affects two things:
*
* - How balance works
* For shareable roots, we need to use reloc tree and do path
* replacement for balance, and need various pre/post hooks for
* snapshot creation to handle them.
*
* While for non-shareable trees, we just simply do a tree search
* with COW.
*
* - How dirty roots are tracked
* For shareable roots, btrfs_record_root_in_trans() is needed to
* track them, while non-subvolume roots have TRACK_DIRTY bit, they
* don't need to set this manually.
*/
BTRFS_ROOT_SHAREABLE,
BTRFS_ROOT_TRACK_DIRTY,
BTRFS_ROOT_IN_RADIX,
BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
BTRFS_ROOT_DEFRAG_RUNNING,
BTRFS_ROOT_FORCE_COW,
BTRFS_ROOT_MULTI_LOG_TASKS,
BTRFS_ROOT_DIRTY,
BTRFS_ROOT_DELETING,
/*
* Reloc tree is orphan, only kept here for qgroup delayed subtree scan
*
* Set for the subvolume tree owning the reloc tree.
*/
BTRFS_ROOT_DEAD_RELOC_TREE,
/* Mark dead root stored on device whose cleanup needs to be resumed */
BTRFS_ROOT_DEAD_TREE,
/* The root has a log tree. Used for subvolume roots and the tree root. */
BTRFS_ROOT_HAS_LOG_TREE,
/* Qgroup flushing is in progress */
BTRFS_ROOT_QGROUP_FLUSHING,
/* We started the orphan cleanup for this root. */
BTRFS_ROOT_ORPHAN_CLEANUP,
/* This root has a drop operation that was started previously. */
BTRFS_ROOT_UNFINISHED_DROP,
/* This reloc root needs to have its buffers lockdep class reset. */
BTRFS_ROOT_RESET_LOCKDEP_CLASS,
};
/*
* 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 rb_node rb_node;
struct extent_buffer *node;
struct extent_buffer *commit_root;
struct btrfs_root *log_root;
struct btrfs_root *reloc_root;
unsigned long state;
struct btrfs_root_item root_item;
struct btrfs_key root_key;
struct btrfs_fs_info *fs_info;
u64 objectid;
u64 last_trans;
u32 type;
u64 last_inode_alloc;
struct list_head unaligned_extent_recs;
/* the dirty list is only used by non-reference counted roots */
struct list_head dirty_list;
spinlock_t accounting_lock;
};
static inline u64 btrfs_root_id(const struct btrfs_root *root)
{
return root->root_key.objectid;
}
static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
{
return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
}
static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
{
return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
}
static inline u32 BTRFS_NODEPTRS_PER_EXTENT_BUFFER(const struct extent_buffer *eb)
{
BUG_ON(!eb->fs_info);
BUG_ON(eb->fs_info->nodesize != eb->len);
return BTRFS_LEAF_DATA_SIZE(eb->fs_info) / sizeof(struct btrfs_key_ptr);
}
static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
{
return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
}
/*
* inode items have the data typically returned from stat and store other
* info about object characteristics. There is one for every file and dir in
* the FS
*/
#define BTRFS_INODE_ITEM_KEY 1
#define BTRFS_INODE_REF_KEY 12
#define BTRFS_INODE_EXTREF_KEY 13
#define BTRFS_XATTR_ITEM_KEY 24
#define BTRFS_VERITY_DESC_ITEM_KEY 36
#define BTRFS_VERITY_MERKLE_ITEM_KEY 37
#define BTRFS_ORPHAN_ITEM_KEY 48
#define BTRFS_DIR_LOG_ITEM_KEY 60
#define BTRFS_DIR_LOG_INDEX_KEY 72
/*
* dir items are the name -> inode pointers in a directory. There is one
* for every name in a directory.
*/
#define BTRFS_DIR_ITEM_KEY 84
#define BTRFS_DIR_INDEX_KEY 96
/*
* extent data is for file data
*/
#define BTRFS_EXTENT_DATA_KEY 108
/*
* csum items have the checksums for data in the extents
*/
#define BTRFS_CSUM_ITEM_KEY 120
/*
* extent csums are stored in a separate tree and hold csums for
* an entire extent on disk.
*/
#define BTRFS_EXTENT_CSUM_KEY 128
/*
* root items point to tree roots. There are typically in the root
* tree used by the super block to find all the other trees
*/
#define BTRFS_ROOT_ITEM_KEY 132
/*
* root backrefs tie subvols and snapshots to the directory entries that
* reference them
*/
#define BTRFS_ROOT_BACKREF_KEY 144
/*
* root refs make a fast index for listing all of the snapshots and
* subvolumes referenced by a given root. They point directly to the
* directory item in the root that references the subvol
*/
#define BTRFS_ROOT_REF_KEY 156
/*
* extent items are in the extent map tree. These record which blocks
* are used, and how many references there are to each block
*/
#define BTRFS_EXTENT_ITEM_KEY 168
/*
* The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
* the length, so we save the level in key->offset instead of the length.
*/
#define BTRFS_METADATA_ITEM_KEY 169
#define BTRFS_TREE_BLOCK_REF_KEY 176
#define BTRFS_EXTENT_DATA_REF_KEY 178
/* old style extent backrefs */
#define BTRFS_EXTENT_REF_V0_KEY 180
#define BTRFS_SHARED_BLOCK_REF_KEY 182
#define BTRFS_SHARED_DATA_REF_KEY 184
/*
* block groups give us hints into the extent allocation trees. Which
* blocks are free etc etc
*/
#define BTRFS_BLOCK_GROUP_ITEM_KEY 192
/*
* Every block group is represented in the free space tree by a free space info
* item, which stores some accounting information. It is keyed on
* (block_group_start, FREE_SPACE_INFO, block_group_length).
*/
#define BTRFS_FREE_SPACE_INFO_KEY 198
/*
* A free space extent tracks an extent of space that is free in a block group.
* It is keyed on (start, FREE_SPACE_EXTENT, length).
*/
#define BTRFS_FREE_SPACE_EXTENT_KEY 199
/*
* When a block group becomes very fragmented, we convert it to use bitmaps
* instead of extents. A free space bitmap is keyed on
* (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with
* (length / sectorsize) bits.
*/
#define BTRFS_FREE_SPACE_BITMAP_KEY 200
#define BTRFS_DEV_EXTENT_KEY 204
#define BTRFS_DEV_ITEM_KEY 216
#define BTRFS_CHUNK_ITEM_KEY 228
#define BTRFS_RAID_STRIPE_KEY 230
#define BTRFS_BALANCE_ITEM_KEY 248
/*
* quota groups
*/
#define BTRFS_QGROUP_STATUS_KEY 240
#define BTRFS_QGROUP_INFO_KEY 242
#define BTRFS_QGROUP_LIMIT_KEY 244
#define BTRFS_QGROUP_RELATION_KEY 246
/*
* Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY.
*/
#define BTRFS_BALANCE_ITEM_KEY 248
/*
* The key type for tree items that are stored persistently, but do not need to
* exist for extended period of time. The items can exist in any tree.
*
* [subtype, BTRFS_TEMPORARY_ITEM_KEY, data]
*
* Existing items:
*
* - balance status item (objectid -4)
* (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0)
*
* - second csum tree for conversion (objecitd -13)
* (BTRFS_CSUM_CHANGE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, <target csum type>)
*/
#define BTRFS_TEMPORARY_ITEM_KEY 248
/*
* Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY
*/
#define BTRFS_DEV_STATS_KEY 249
/*
* The key type for tree items that are stored persistently and usually exist
* for a long period, eg. filesystem lifetime. The item kinds can be status
* information, stats or preference values. The item can exist in any tree.
*
* [subtype, BTRFS_PERSISTENT_ITEM_KEY, data]
*
* Existing items:
*
* - device statistics, store IO stats in the device tree, one key for all
* stats
* (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0)
*/
#define BTRFS_PERSISTENT_ITEM_KEY 249
/*
* Persistently stores the device replace state in the device tree.
* The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
*/
#define BTRFS_DEV_REPLACE_KEY 250
/*
* Stores items that allow to quickly map UUIDs to something else.
* These items are part of the filesystem UUID tree.
* The key is built like this:
* (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
*/
#if BTRFS_UUID_SIZE != 16
#error "UUID items require BTRFS_UUID_SIZE == 16!"
#endif
#define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */
#define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to
* received subvols */
/*
* string items are for debugging. They just store a short string of
* data in the FS
*/
#define BTRFS_STRING_ITEM_KEY 253
static inline unsigned long btrfs_header_fsid(void)
{
return offsetof(struct btrfs_header, fsid);
}
static inline unsigned long btrfs_header_chunk_tree_uuid(const struct extent_buffer *eb)
{
return offsetof(struct btrfs_header, chunk_tree_uuid);
}
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;
}
static inline struct btrfs_timespec *
btrfs_inode_otime(struct btrfs_inode_item *inode_item)
{
unsigned long ptr = (unsigned long)inode_item;
ptr += offsetof(struct btrfs_inode_item, otime);
return (struct btrfs_timespec *)ptr;
}
static inline struct btrfs_timespec* btrfs_root_ctime(
struct btrfs_root_item *root_item)
{
unsigned long ptr = (unsigned long)root_item;
ptr += offsetof(struct btrfs_root_item, ctime);
return (struct btrfs_timespec *)ptr;
}
static inline struct btrfs_timespec* btrfs_root_otime(
struct btrfs_root_item *root_item)
{
unsigned long ptr = (unsigned long)root_item;
ptr += offsetof(struct btrfs_root_item, otime);
return (struct btrfs_timespec *)ptr;
}
static inline struct btrfs_timespec* btrfs_root_stime(
struct btrfs_root_item *root_item)
{
unsigned long ptr = (unsigned long)root_item;
ptr += offsetof(struct btrfs_root_item, stime);
return (struct btrfs_timespec *)ptr;
}
static inline struct btrfs_timespec* btrfs_root_rtime(
struct btrfs_root_item *root_item)
{
unsigned long ptr = (unsigned long)root_item;
ptr += offsetof(struct btrfs_root_item, rtime);
return (struct btrfs_timespec *)ptr;
}
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);
}
static inline u64 btrfs_dev_stats_value(const struct extent_buffer *eb,
const struct btrfs_dev_stats_item *ptr,
int index)
{
u64 val;
read_extent_buffer(eb, &val,
offsetof(struct btrfs_dev_stats_item, values) +
((unsigned long)ptr) + (index * sizeof(u64)),
sizeof(val));
return val;
}
/* struct btrfs_ioctl_search_header */
static inline u64 btrfs_search_header_transid(struct btrfs_ioctl_search_header *sh)
{
return get_unaligned_64(&sh->transid);
}
static inline u64 btrfs_search_header_objectid(struct btrfs_ioctl_search_header *sh)
{
return get_unaligned_64(&sh->objectid);
}
static inline u64 btrfs_search_header_offset(struct btrfs_ioctl_search_header *sh)
{
return get_unaligned_64(&sh->offset);
}
static inline u32 btrfs_search_header_type(struct btrfs_ioctl_search_header *sh)
{
return get_unaligned_32(&sh->type);
}
static inline u32 btrfs_search_header_len(struct btrfs_ioctl_search_header *sh)
{
return get_unaligned_32(&sh->len);
}
#define btrfs_fs_incompat(fs_info, opt) \
__btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
{
struct btrfs_super_block *disk_super;
disk_super = fs_info->super_copy;
return !!(btrfs_super_incompat_flags(disk_super) & flag);
}
#define btrfs_fs_compat_ro(fs_info, opt) \
__btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
{
struct btrfs_super_block *disk_super;
disk_super = fs_info->super_copy;
return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
}
static inline u64 btrfs_name_hash(const char *name, int len)
{
return crc32c((u32)~1, name, len);
}
/*
* Figure the key offset of an extended inode ref
*/
static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
int len)
{
return (u64)crc32c(parent_objectid, name, len);
}
/* extent-tree.c */
int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 num_bytes, u64 empty_size,
u64 hint_byte, u64 search_end,
struct btrfs_key *ins, bool is_data);
int btrfs_fix_block_accounting(struct btrfs_trans_handle *trans);
void btrfs_pin_extent(struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes);
void btrfs_unpin_extent(struct btrfs_fs_info *fs_info,
u64 bytenr, u64 num_bytes);
struct btrfs_block_group *btrfs_lookup_block_group(struct btrfs_fs_info *info,
u64 bytenr);
struct btrfs_block_group *btrfs_lookup_first_block_group(struct
btrfs_fs_info *info,
u64 bytenr);
struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 parent, u64 root_objectid,
struct btrfs_disk_key *key, int level,
u64 hint, u64 empty_size,
enum btrfs_lock_nesting nest);
int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 bytenr,
u64 offset, int metadata, u64 *refs, u64 *flags);
int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
struct extent_buffer *eb, u64 flags);
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct extent_buffer *buf, int record_parent);
int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct extent_buffer *buf, int record_parent);
int btrfs_free_tree_block(struct btrfs_trans_handle *trans, u64 root_id,
struct extent_buffer *buf, u64 parent, int last_ref);
int btrfs_free_extent(struct btrfs_trans_handle *trans,
u64 bytenr, u64 num_bytes, u64 parent,
u64 root_objectid, u64 owner, u64 offset);
void btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
u64 bytenr, u64 num_bytes, u64 parent,
u64 root_objectid, u64 owner, u64 offset);
int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytenr,
u64 orig_parent, u64 parent,
u64 root_objectid, u64 ref_generation,
u64 owner_objectid);
int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans);
struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info, u64 flags);
int update_space_info(struct btrfs_fs_info *info, u64 flags,
u64 total_bytes, u64 bytes_used,
struct btrfs_space_info **space_info);
int btrfs_free_block_groups(struct btrfs_fs_info *info);
int btrfs_read_block_groups(struct btrfs_fs_info *info);
int btrfs_try_chunk_alloc(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 alloc_bytes,
u64 flags);
struct btrfs_block_group *
btrfs_add_block_group(struct btrfs_fs_info *fs_info, u64 bytes_used, u64 type,
u64 chunk_offset, u64 size);
int btrfs_make_block_group(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 bytes_used,
u64 type, u64 chunk_offset, u64 size);
int btrfs_make_block_groups(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
int btrfs_update_block_group(struct btrfs_trans_handle *trans, u64 bytenr,
u64 num, int alloc, int mark_free);
int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
u64 bytenr, u64 len);
void free_excluded_extents(struct btrfs_fs_info *fs_info,
struct btrfs_block_group *cache);
int exclude_super_stripes(struct btrfs_fs_info *fs_info,
struct btrfs_block_group *cache);
u64 add_new_free_space(struct btrfs_block_group *block_group,
struct btrfs_fs_info *info, u64 start, u64 end);
u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
int btrfs_convert_one_bg(struct btrfs_trans_handle *trans, u64 bytenr);
/* ctree.c */
int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
int btrfs_del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_path *path, int level, int slot);
struct extent_buffer *btrfs_read_node_slot(struct extent_buffer *parent,
int slot);
int btrfs_previous_item(struct btrfs_root *root,
struct btrfs_path *path, u64 min_objectid,
int type);
int btrfs_previous_extent_item(struct btrfs_root *root,
struct btrfs_path *path, u64 min_objectid);
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,
enum btrfs_lock_nesting nest);
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_create_root(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 objectid);
void btrfs_extend_item(struct btrfs_path *path, u32 data_size);
void btrfs_truncate_item(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,
const struct btrfs_key *new_key,
unsigned long split_offset);
int btrfs_search_slot(struct btrfs_trans_handle *trans,
struct btrfs_root *root, const struct btrfs_key *key,
struct btrfs_path *p, int ins_len, int cow);
int btrfs_search_slot_for_read(struct btrfs_root *root,
const struct btrfs_key *key,
struct btrfs_path *p, int find_higher,
int return_any);
int btrfs_bin_search(struct extent_buffer *eb, int first_slot,
const struct btrfs_key *key, int *slot);
int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *found_path,
u64 iobjectid, u64 ioff, u8 key_type,
struct btrfs_key *found_key);
void btrfs_release_path(struct btrfs_path *p);
void add_root_to_dirty_list(struct btrfs_root *root);
struct btrfs_path *btrfs_alloc_path(void);
void btrfs_free_path(struct btrfs_path *p);
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);
}
/*
* Describes a batch of items to insert in a btree. This is used by
* btrfs_insert_empty_items().
*/
struct btrfs_item_batch {
/*
* Pointer to an array containing the keys of the items to insert (in
* sorted order).
*/
const struct btrfs_key *keys;
/* Pointer to an array containing the data size for each item to insert. */
const u32 *data_sizes;
/*
* The sum of data sizes for all items. The caller can compute this while
* setting up the data_sizes array, so it ends up being more efficient
* than having btrfs_insert_empty_items() or setup_item_for_insert()
* doing it, as it would avoid an extra loop over a potentially large
* array, and in the case of setup_item_for_insert(), we would be doing
* it while holding a write lock on a leaf and often on upper level nodes
* too, unnecessarily increasing the size of a critical section.
*/
u32 total_data_size;
/* Size of the keys and data_sizes arrays (number of items in the batch). */
int nr;
};
int btrfs_insert_item(struct btrfs_trans_handle *trans,
struct btrfs_root *root, const 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,
const struct btrfs_item_batch *batch);
static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
const struct btrfs_key *key,
u32 data_size)
{
struct btrfs_item_batch batch;
batch.keys = key;
batch.data_sizes = &data_size;
batch.total_data_size = data_size;
batch.nr = 1;
return btrfs_insert_empty_items(trans, root, path, &batch);
}
int btrfs_next_sibling_tree_block(struct btrfs_fs_info *fs_info,
struct btrfs_path *path);
/*
* Walk up the tree as far as necessary to find the next leaf.
*
* returns 0 if it found something or 1 if there are no greater leaves.
* returns < 0 on io errors.
*/
static inline int btrfs_next_leaf(struct btrfs_root *root,
struct btrfs_path *path)
{
path->lowest_level = 0;
return btrfs_next_sibling_tree_block(root->fs_info, path);
}
static inline int btrfs_next_item(struct btrfs_root *root,
struct btrfs_path *p)
{
++p->slots[0];
if (p->slots[0] >= btrfs_header_nritems(p->nodes[0])) {
int ret;
ret = btrfs_next_leaf(root, p);
/*
* Revert the increased slot, or the path may point to
* an invalid item.
*/
if (ret)
p->slots[0]--;
return ret;
}
return 0;
}
int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
int btrfs_leaf_free_space(const struct extent_buffer *leaf);
void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
struct btrfs_path *path,
const struct btrfs_key *new_key);
int btrfs_super_csum_size(const struct btrfs_super_block *sb);
const char *btrfs_super_csum_name(u16 csum_type);
const char *btrfs_super_csum_driver(u16 csum_type);
u16 btrfs_csum_type_size(u16 csum_type);
size_t __attribute_const__ btrfs_get_num_csums(void);
/* root-item.c */
int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *tree_root,
u64 root_id, u8 type, u64 ref_id,
u64 dirid, u64 sequence,
const char *name, int name_len);
int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_key *key, struct btrfs_root_item
*item);
int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_key *key);
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);
/* dir-item.c */
int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
*root, const char *name, int name_len, u64 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);
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, const char *name,
u16 name_len, const void *data, u16 data_len,
u64 dir);
struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
struct btrfs_path *path,
const char *name, int name_len);
/* 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_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
*root, u64 objectid, struct btrfs_inode_item
*inode_item);
int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path,
struct btrfs_key *location, int mod);
struct btrfs_inode_extref *btrfs_lookup_inode_extref(struct btrfs_trans_handle
*trans, struct btrfs_path *path, struct btrfs_root *root,
u64 ino, u64 parent_ino, u64 index, const char *name,
int namelen, int ins_len);
int btrfs_del_inode_extref(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_insert_inode_extref(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 namelen, u64 ino, u64 parent_ino,
int ins_len);
int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root, const char *name, int name_len,
u64 ino, u64 parent_ino, u64 *index);
static inline int is_fstree(u64 rootid)
{
if (rootid == BTRFS_FS_TREE_OBJECTID ||
(signed long long)rootid >= (signed long long)BTRFS_FIRST_FREE_OBJECTID)
return 1;
return 0;
}
/* inode.c */
int btrfs_find_free_dir_index(struct btrfs_root *root, u64 dir_ino,
u64 *ret_ino);
int btrfs_check_dir_conflict(struct btrfs_root *root, const char *name,
int namelen, u64 dir, u64 index);
int btrfs_new_inode(struct btrfs_trans_handle *trans, struct btrfs_root *root,
u64 ino, u32 mode);
int btrfs_change_inode_flags(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 ino, u64 flags);
int btrfs_add_link(struct btrfs_trans_handle *trans, struct btrfs_root *root,
u64 ino, u64 parent_ino, const char *name, int namelen,
u8 type, u64 *index, int add_backref, int ignore_existed);
int btrfs_unlink(struct btrfs_trans_handle *trans, struct btrfs_root *root,
u64 ino, u64 parent_ino, u64 index, const char *name,
int namelen, int add_orphan);
int btrfs_add_orphan_item(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *path,
u64 ino);
int btrfs_mkdir(struct btrfs_trans_handle *trans, struct btrfs_root *root,
char *name, int namelen, u64 parent_ino, u64 *ino, int mode);
int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
struct btrfs_root *fs_root,
u64 dirid, u64 *objectid);
/* file.c */
int btrfs_get_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
u64 ino, u64 offset, u64 len, int ins_len);
int btrfs_punch_hole(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 ino, u64 offset, u64 len);
int btrfs_read_file(struct btrfs_root *root, u64 ino, u64 start, int len,
char *dest);
/* extent-tree.c */
int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, unsigned long nr);
#endif
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