1173 lines
30 KiB
C
1173 lines
30 KiB
C
#ifndef __BTRFS__
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#define __BTRFS__
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#include <linux/fs.h>
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#include <linux/buffer_head.h>
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#include <linux/kobject.h>
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#include "bit-radix.h"
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struct btrfs_trans_handle;
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struct btrfs_transaction;
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extern struct kmem_cache *btrfs_path_cachep;
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#define BTRFS_MAGIC "_BtRfS_M"
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#define BTRFS_ROOT_TREE_OBJECTID 1ULL
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#define BTRFS_DEV_TREE_OBJECTID 2ULL
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#define BTRFS_EXTENT_TREE_OBJECTID 3ULL
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#define BTRFS_FS_TREE_OBJECTID 4ULL
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#define BTRFS_ROOT_TREE_DIR_OBJECTID 5ULL
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#define BTRFS_FIRST_FREE_OBJECTID 6ULL
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/*
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* we can actually store much bigger names, but lets not confuse the rest
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* of linux
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*/
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#define BTRFS_NAME_LEN 255
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/* 32 bytes in various csum fields */
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#define BTRFS_CSUM_SIZE 32
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/*
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* the key defines the order in the tree, and so it also defines (optimal)
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* block layout. objectid corresonds to the inode number. The flags
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* tells us things about the object, and is a kind of stream selector.
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* so for a given inode, keys with flags of 1 might refer to the inode
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* data, flags of 2 may point to file data in the btree and flags == 3
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* may point to extents.
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*
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* offset is the starting byte offset for this key in the stream.
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*
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* btrfs_disk_key is in disk byte order. struct btrfs_key is always
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* in cpu native order. Otherwise they are identical and their sizes
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* should be the same (ie both packed)
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*/
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struct btrfs_disk_key {
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__le64 objectid;
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__le32 flags;
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__le64 offset;
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} __attribute__ ((__packed__));
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struct btrfs_key {
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u64 objectid;
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u32 flags;
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u64 offset;
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} __attribute__ ((__packed__));
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/*
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* every tree block (leaf or node) starts with this header.
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*/
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struct btrfs_header {
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u8 csum[BTRFS_CSUM_SIZE];
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u8 fsid[16]; /* FS specific uuid */
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__le64 blocknr; /* which block this node is supposed to live in */
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__le64 generation;
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__le64 owner;
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__le16 nritems;
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__le16 flags;
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u8 level;
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} __attribute__ ((__packed__));
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#define BTRFS_MAX_LEVEL 8
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#define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
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sizeof(struct btrfs_header)) / \
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(sizeof(struct btrfs_disk_key) + sizeof(u64)))
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#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
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#define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
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#define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
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sizeof(struct btrfs_item) - \
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sizeof(struct btrfs_file_extent_item))
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struct buffer_head;
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/*
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* the super block basically lists the main trees of the FS
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* it currently lacks any block count etc etc
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*/
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struct btrfs_super_block {
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u8 csum[BTRFS_CSUM_SIZE];
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/* the first 3 fields must match struct btrfs_header */
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u8 fsid[16]; /* FS specific uuid */
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__le64 blocknr; /* this block number */
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__le64 magic;
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__le32 blocksize;
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__le64 generation;
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__le64 root;
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__le64 total_blocks;
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__le64 blocks_used;
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__le64 root_dir_objectid;
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__le64 last_device_id;
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/* fields below here vary with the underlying disk */
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__le64 device_block_start;
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__le64 device_num_blocks;
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__le64 device_root;
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__le64 device_id;
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} __attribute__ ((__packed__));
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/*
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* A leaf is full of items. offset and size tell us where to find
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* the item in the leaf (relative to the start of the data area)
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*/
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struct btrfs_item {
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struct btrfs_disk_key key;
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__le32 offset;
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__le16 size;
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} __attribute__ ((__packed__));
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/*
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* leaves have an item area and a data area:
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* [item0, item1....itemN] [free space] [dataN...data1, data0]
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*
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* The data is separate from the items to get the keys closer together
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* during searches.
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*/
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struct btrfs_leaf {
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struct btrfs_header header;
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struct btrfs_item items[];
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} __attribute__ ((__packed__));
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/*
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* all non-leaf blocks are nodes, they hold only keys and pointers to
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* other blocks
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*/
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struct btrfs_key_ptr {
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struct btrfs_disk_key key;
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__le64 blockptr;
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} __attribute__ ((__packed__));
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struct btrfs_node {
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struct btrfs_header header;
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struct btrfs_key_ptr ptrs[];
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} __attribute__ ((__packed__));
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/*
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* btrfs_paths remember the path taken from the root down to the leaf.
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* level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
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* to any other levels that are present.
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*
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* The slots array records the index of the item or block pointer
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* used while walking the tree.
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*/
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struct btrfs_path {
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struct buffer_head *nodes[BTRFS_MAX_LEVEL];
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int slots[BTRFS_MAX_LEVEL];
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};
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/*
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* items in the extent btree are used to record the objectid of the
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* owner of the block and the number of references
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*/
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struct btrfs_extent_item {
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__le32 refs;
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__le64 owner;
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} __attribute__ ((__packed__));
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struct btrfs_inode_timespec {
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__le64 sec;
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__le32 nsec;
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} __attribute__ ((__packed__));
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/*
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* there is no padding here on purpose. If you want to extent the inode,
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* make a new item type
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*/
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struct btrfs_inode_item {
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__le64 generation;
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__le64 size;
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__le64 nblocks;
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__le32 nlink;
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__le32 uid;
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__le32 gid;
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__le32 mode;
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__le32 rdev;
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__le16 flags;
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__le16 compat_flags;
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struct btrfs_inode_timespec atime;
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struct btrfs_inode_timespec ctime;
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struct btrfs_inode_timespec mtime;
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struct btrfs_inode_timespec otime;
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} __attribute__ ((__packed__));
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struct btrfs_dir_item {
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struct btrfs_disk_key location;
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__le16 flags;
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__le16 name_len;
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u8 type;
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} __attribute__ ((__packed__));
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struct btrfs_root_item {
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struct btrfs_inode_item inode;
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__le64 root_dirid;
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__le64 blocknr;
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__le32 flags;
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__le64 block_limit;
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__le64 blocks_used;
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__le32 refs;
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} __attribute__ ((__packed__));
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#define BTRFS_FILE_EXTENT_REG 0
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#define BTRFS_FILE_EXTENT_INLINE 1
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struct btrfs_file_extent_item {
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__le64 generation;
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u8 type;
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/*
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* disk space consumed by the extent, checksum blocks are included
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* in these numbers
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*/
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__le64 disk_blocknr;
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__le64 disk_num_blocks;
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/*
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* the logical offset in file blocks (no csums)
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* this extent record is for. This allows a file extent to point
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* into the middle of an existing extent on disk, sharing it
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* between two snapshots (useful if some bytes in the middle of the
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* extent have changed
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*/
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__le64 offset;
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/*
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* the logical number of file blocks (no csums included)
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*/
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__le64 num_blocks;
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} __attribute__ ((__packed__));
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struct btrfs_csum_item {
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u8 csum[BTRFS_CSUM_SIZE];
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} __attribute__ ((__packed__));
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struct btrfs_device_item {
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__le16 pathlen;
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__le64 device_id;
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} __attribute__ ((__packed__));
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/* tag for the radix tree of block groups in ram */
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#define BTRFS_BLOCK_GROUP_DIRTY 0
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#define BTRFS_BLOCK_GROUP_HINTS 8
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#define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
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struct btrfs_block_group_item {
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__le64 used;
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} __attribute__ ((__packed__));
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struct btrfs_block_group_cache {
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struct btrfs_key key;
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struct btrfs_block_group_item item;
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};
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struct crypto_hash;
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struct btrfs_fs_info {
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struct btrfs_root *extent_root;
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struct btrfs_root *tree_root;
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struct btrfs_root *dev_root;
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struct btrfs_key last_insert;
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struct radix_tree_root fs_roots_radix;
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struct radix_tree_root pending_del_radix;
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struct radix_tree_root pinned_radix;
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struct radix_tree_root dev_radix;
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struct radix_tree_root block_group_radix;
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u64 extent_tree_insert[BTRFS_MAX_LEVEL * 3];
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int extent_tree_insert_nr;
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u64 extent_tree_prealloc[BTRFS_MAX_LEVEL * 3];
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int extent_tree_prealloc_nr;
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u64 generation;
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struct btrfs_transaction *running_transaction;
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struct btrfs_super_block *disk_super;
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struct buffer_head *sb_buffer;
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struct super_block *sb;
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struct inode *btree_inode;
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struct mutex trans_mutex;
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struct mutex fs_mutex;
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struct list_head trans_list;
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struct crypto_hash *hash_tfm;
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spinlock_t hash_lock;
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int do_barriers;
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struct kobject kobj;
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};
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/*
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* in ram representation of the tree. extent_root is used for all allocations
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* and for the extent tree extent_root root.
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*/
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struct btrfs_root {
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struct buffer_head *node;
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struct buffer_head *commit_root;
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struct btrfs_root_item root_item;
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struct btrfs_key root_key;
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struct btrfs_fs_info *fs_info;
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struct inode *inode;
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u64 objectid;
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u64 last_trans;
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u32 blocksize;
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int ref_cows;
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u32 type;
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u64 highest_inode;
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u64 last_inode_alloc;
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};
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/* the lower bits in the key flags defines the item type */
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#define BTRFS_KEY_TYPE_MAX 256
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#define BTRFS_KEY_TYPE_SHIFT 24
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#define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
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BTRFS_KEY_TYPE_SHIFT)
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/*
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* inode items have the data typically returned from stat and store other
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* info about object characteristics. There is one for every file and dir in
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* the FS
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*/
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#define BTRFS_INODE_ITEM_KEY 1
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/* reserve 2-15 close to the inode for later flexibility */
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/*
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* dir items are the name -> inode pointers in a directory. There is one
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* for every name in a directory.
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*/
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#define BTRFS_DIR_ITEM_KEY 16
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#define BTRFS_DIR_INDEX_KEY 17
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/*
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* extent data is for file data
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*/
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#define BTRFS_EXTENT_DATA_KEY 18
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/*
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* csum items have the checksums for data in the extents
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*/
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#define BTRFS_CSUM_ITEM_KEY 19
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/* reserve 20-31 for other file stuff */
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/*
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* root items point to tree roots. There are typically in the root
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* tree used by the super block to find all the other trees
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*/
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#define BTRFS_ROOT_ITEM_KEY 32
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/*
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* extent items are in the extent map tree. These record which blocks
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* are used, and how many references there are to each block
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*/
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#define BTRFS_EXTENT_ITEM_KEY 33
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/*
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* block groups give us hints into the extent allocation trees. Which
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* blocks are free etc etc
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*/
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#define BTRFS_BLOCK_GROUP_ITEM_KEY 34
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/*
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* dev items list the devices that make up the FS
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*/
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#define BTRFS_DEV_ITEM_KEY 35
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/*
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* string items are for debugging. They just store a short string of
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* data in the FS
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*/
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#define BTRFS_STRING_ITEM_KEY 253
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static inline u64 btrfs_block_group_used(struct btrfs_block_group_item *bi)
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{
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return le64_to_cpu(bi->used);
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}
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static inline void btrfs_set_block_group_used(struct
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btrfs_block_group_item *bi,
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u64 val)
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{
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bi->used = cpu_to_le64(val);
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}
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static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
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{
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return le64_to_cpu(i->generation);
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}
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static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
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u64 val)
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{
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i->generation = cpu_to_le64(val);
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}
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static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
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{
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return le64_to_cpu(i->size);
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}
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static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
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{
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i->size = cpu_to_le64(val);
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}
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static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
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{
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return le64_to_cpu(i->nblocks);
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}
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static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
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{
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i->nblocks = cpu_to_le64(val);
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}
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static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
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{
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return le32_to_cpu(i->nlink);
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}
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static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
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{
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i->nlink = cpu_to_le32(val);
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}
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static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
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{
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return le32_to_cpu(i->uid);
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}
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static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
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{
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i->uid = cpu_to_le32(val);
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}
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static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
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{
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return le32_to_cpu(i->gid);
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}
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static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
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{
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i->gid = cpu_to_le32(val);
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}
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static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
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{
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return le32_to_cpu(i->mode);
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}
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static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
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{
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i->mode = cpu_to_le32(val);
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}
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static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
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{
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return le32_to_cpu(i->rdev);
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}
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static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
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{
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i->rdev = cpu_to_le32(val);
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}
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static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
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{
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return le16_to_cpu(i->flags);
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}
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static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
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{
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i->flags = cpu_to_le16(val);
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}
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static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
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{
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return le16_to_cpu(i->compat_flags);
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}
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static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
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u16 val)
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{
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i->compat_flags = cpu_to_le16(val);
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}
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static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
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{
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return le64_to_cpu(ts->sec);
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}
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static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
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u64 val)
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{
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ts->sec = cpu_to_le64(val);
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}
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static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
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{
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return le32_to_cpu(ts->nsec);
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}
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static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
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u32 val)
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{
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ts->nsec = cpu_to_le32(val);
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}
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static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
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{
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return le32_to_cpu(ei->refs);
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}
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static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
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{
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ei->refs = cpu_to_le32(val);
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}
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static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
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{
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return le64_to_cpu(ei->owner);
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}
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static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
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{
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ei->owner = cpu_to_le64(val);
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}
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|
static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
|
|
{
|
|
return le64_to_cpu(n->ptrs[nr].blockptr);
|
|
}
|
|
|
|
|
|
static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
|
|
u64 val)
|
|
{
|
|
n->ptrs[nr].blockptr = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u32 btrfs_item_offset(struct btrfs_item *item)
|
|
{
|
|
return le32_to_cpu(item->offset);
|
|
}
|
|
|
|
static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
|
|
{
|
|
item->offset = cpu_to_le32(val);
|
|
}
|
|
|
|
static inline u32 btrfs_item_end(struct btrfs_item *item)
|
|
{
|
|
return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
|
|
}
|
|
|
|
static inline u16 btrfs_item_size(struct btrfs_item *item)
|
|
{
|
|
return le16_to_cpu(item->size);
|
|
}
|
|
|
|
static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
|
|
{
|
|
item->size = cpu_to_le16(val);
|
|
}
|
|
|
|
static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
|
|
{
|
|
return le16_to_cpu(d->flags);
|
|
}
|
|
|
|
static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
|
|
{
|
|
d->flags = cpu_to_le16(val);
|
|
}
|
|
|
|
static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
|
|
{
|
|
return d->type;
|
|
}
|
|
|
|
static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
|
|
{
|
|
d->type = val;
|
|
}
|
|
|
|
static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
|
|
{
|
|
return le16_to_cpu(d->name_len);
|
|
}
|
|
|
|
static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
|
|
{
|
|
d->name_len = cpu_to_le16(val);
|
|
}
|
|
|
|
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->flags = le32_to_cpu(disk->flags);
|
|
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->flags = cpu_to_le32(cpu->flags);
|
|
disk->objectid = cpu_to_le64(cpu->objectid);
|
|
}
|
|
|
|
static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
|
|
{
|
|
return le64_to_cpu(disk->objectid);
|
|
}
|
|
|
|
static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
|
|
u64 val)
|
|
{
|
|
disk->objectid = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
|
|
{
|
|
return le64_to_cpu(disk->offset);
|
|
}
|
|
|
|
static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
|
|
u64 val)
|
|
{
|
|
disk->offset = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
|
|
{
|
|
return le32_to_cpu(disk->flags);
|
|
}
|
|
|
|
static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
|
|
u32 val)
|
|
{
|
|
disk->flags = cpu_to_le32(val);
|
|
}
|
|
|
|
static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
|
|
{
|
|
return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
|
|
}
|
|
|
|
static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
|
|
u32 val)
|
|
{
|
|
u32 flags = btrfs_disk_key_flags(key);
|
|
BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
|
|
val = val << BTRFS_KEY_TYPE_SHIFT;
|
|
flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
|
|
btrfs_set_disk_key_flags(key, flags);
|
|
}
|
|
|
|
static inline u32 btrfs_key_type(struct btrfs_key *key)
|
|
{
|
|
return key->flags >> BTRFS_KEY_TYPE_SHIFT;
|
|
}
|
|
|
|
static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
|
|
{
|
|
BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
|
|
val = val << BTRFS_KEY_TYPE_SHIFT;
|
|
key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
|
|
}
|
|
|
|
static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
|
|
{
|
|
return le64_to_cpu(h->blocknr);
|
|
}
|
|
|
|
static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
|
|
{
|
|
h->blocknr = cpu_to_le64(blocknr);
|
|
}
|
|
|
|
static inline u64 btrfs_header_generation(struct btrfs_header *h)
|
|
{
|
|
return le64_to_cpu(h->generation);
|
|
}
|
|
|
|
static inline void btrfs_set_header_generation(struct btrfs_header *h,
|
|
u64 val)
|
|
{
|
|
h->generation = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u64 btrfs_header_owner(struct btrfs_header *h)
|
|
{
|
|
return le64_to_cpu(h->owner);
|
|
}
|
|
|
|
static inline void btrfs_set_header_owner(struct btrfs_header *h,
|
|
u64 val)
|
|
{
|
|
h->owner = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u16 btrfs_header_nritems(struct btrfs_header *h)
|
|
{
|
|
return le16_to_cpu(h->nritems);
|
|
}
|
|
|
|
static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
|
|
{
|
|
h->nritems = cpu_to_le16(val);
|
|
}
|
|
|
|
static inline u16 btrfs_header_flags(struct btrfs_header *h)
|
|
{
|
|
return le16_to_cpu(h->flags);
|
|
}
|
|
|
|
static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
|
|
{
|
|
h->flags = cpu_to_le16(val);
|
|
}
|
|
|
|
static inline int btrfs_header_level(struct btrfs_header *h)
|
|
{
|
|
return h->level;
|
|
}
|
|
|
|
static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
|
|
{
|
|
BUG_ON(level > BTRFS_MAX_LEVEL);
|
|
h->level = level;
|
|
}
|
|
|
|
static inline int btrfs_is_leaf(struct btrfs_node *n)
|
|
{
|
|
return (btrfs_header_level(&n->header) == 0);
|
|
}
|
|
|
|
static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
|
|
{
|
|
return le64_to_cpu(item->blocknr);
|
|
}
|
|
|
|
static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
|
|
{
|
|
item->blocknr = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
|
|
{
|
|
return le64_to_cpu(item->root_dirid);
|
|
}
|
|
|
|
static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
|
|
{
|
|
item->root_dirid = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
|
|
{
|
|
return le32_to_cpu(item->refs);
|
|
}
|
|
|
|
static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
|
|
{
|
|
item->refs = cpu_to_le32(val);
|
|
}
|
|
|
|
static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
|
|
{
|
|
return le64_to_cpu(s->blocknr);
|
|
}
|
|
|
|
static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
|
|
{
|
|
s->blocknr = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
|
|
{
|
|
return le64_to_cpu(s->generation);
|
|
}
|
|
|
|
static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
|
|
u64 val)
|
|
{
|
|
s->generation = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u64 btrfs_super_root(struct btrfs_super_block *s)
|
|
{
|
|
return le64_to_cpu(s->root);
|
|
}
|
|
|
|
static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
|
|
{
|
|
s->root = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
|
|
{
|
|
return le64_to_cpu(s->total_blocks);
|
|
}
|
|
|
|
static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
|
|
u64 val)
|
|
{
|
|
s->total_blocks = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
|
|
{
|
|
return le64_to_cpu(s->blocks_used);
|
|
}
|
|
|
|
static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
|
|
u64 val)
|
|
{
|
|
s->blocks_used = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
|
|
{
|
|
return le32_to_cpu(s->blocksize);
|
|
}
|
|
|
|
static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
|
|
u32 val)
|
|
{
|
|
s->blocksize = cpu_to_le32(val);
|
|
}
|
|
|
|
static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
|
|
{
|
|
return le64_to_cpu(s->root_dir_objectid);
|
|
}
|
|
|
|
static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
|
|
val)
|
|
{
|
|
s->root_dir_objectid = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
|
|
{
|
|
return le64_to_cpu(s->last_device_id);
|
|
}
|
|
|
|
static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
|
|
u64 val)
|
|
{
|
|
s->last_device_id = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
|
|
{
|
|
return le64_to_cpu(s->device_id);
|
|
}
|
|
|
|
static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
|
|
u64 val)
|
|
{
|
|
s->device_id = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
|
|
{
|
|
return le64_to_cpu(s->device_block_start);
|
|
}
|
|
|
|
static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
|
|
*s, u64 val)
|
|
{
|
|
s->device_block_start = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
|
|
{
|
|
return le64_to_cpu(s->device_num_blocks);
|
|
}
|
|
|
|
static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
|
|
*s, u64 val)
|
|
{
|
|
s->device_num_blocks = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
|
|
{
|
|
return le64_to_cpu(s->device_root);
|
|
}
|
|
|
|
static inline void btrfs_set_super_device_root(struct btrfs_super_block
|
|
*s, u64 val)
|
|
{
|
|
s->device_root = cpu_to_le64(val);
|
|
}
|
|
|
|
|
|
static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
|
|
{
|
|
return (u8 *)l->items;
|
|
}
|
|
|
|
static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
|
|
{
|
|
return e->type;
|
|
}
|
|
static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
|
|
u8 val)
|
|
{
|
|
e->type = val;
|
|
}
|
|
|
|
static inline char *btrfs_file_extent_inline_start(struct
|
|
btrfs_file_extent_item *e)
|
|
{
|
|
return (char *)(&e->disk_blocknr);
|
|
}
|
|
|
|
static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
|
|
{
|
|
return (unsigned long)(&((struct
|
|
btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
|
|
}
|
|
|
|
static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
|
|
{
|
|
struct btrfs_file_extent_item *fe = NULL;
|
|
return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
|
|
}
|
|
|
|
static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
|
|
*e)
|
|
{
|
|
return le64_to_cpu(e->disk_blocknr);
|
|
}
|
|
|
|
static inline void btrfs_set_file_extent_disk_blocknr(struct
|
|
btrfs_file_extent_item
|
|
*e, u64 val)
|
|
{
|
|
e->disk_blocknr = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
|
|
{
|
|
return le64_to_cpu(e->generation);
|
|
}
|
|
|
|
static inline void btrfs_set_file_extent_generation(struct
|
|
btrfs_file_extent_item *e,
|
|
u64 val)
|
|
{
|
|
e->generation = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u64 btrfs_file_extent_disk_num_blocks(struct
|
|
btrfs_file_extent_item *e)
|
|
{
|
|
return le64_to_cpu(e->disk_num_blocks);
|
|
}
|
|
|
|
static inline void btrfs_set_file_extent_disk_num_blocks(struct
|
|
btrfs_file_extent_item
|
|
*e, u64 val)
|
|
{
|
|
e->disk_num_blocks = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
|
|
{
|
|
return le64_to_cpu(e->offset);
|
|
}
|
|
|
|
static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
|
|
*e, u64 val)
|
|
{
|
|
e->offset = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
|
|
*e)
|
|
{
|
|
return le64_to_cpu(e->num_blocks);
|
|
}
|
|
|
|
static inline void btrfs_set_file_extent_num_blocks(struct
|
|
btrfs_file_extent_item *e,
|
|
u64 val)
|
|
{
|
|
e->num_blocks = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
|
|
{
|
|
return le16_to_cpu(d->pathlen);
|
|
}
|
|
|
|
static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
|
|
u16 val)
|
|
{
|
|
d->pathlen = cpu_to_le16(val);
|
|
}
|
|
|
|
static inline u64 btrfs_device_id(struct btrfs_device_item *d)
|
|
{
|
|
return le64_to_cpu(d->device_id);
|
|
}
|
|
|
|
static inline void btrfs_set_device_id(struct btrfs_device_item *d,
|
|
u64 val)
|
|
{
|
|
d->device_id = cpu_to_le64(val);
|
|
}
|
|
|
|
static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
|
|
{
|
|
return sb->s_fs_info;
|
|
}
|
|
|
|
static inline void btrfs_check_bounds(void *vptr, size_t len,
|
|
void *vcontainer, size_t container_len)
|
|
{
|
|
char *ptr = vptr;
|
|
char *container = vcontainer;
|
|
WARN_ON(ptr < container);
|
|
WARN_ON(ptr + len > container + container_len);
|
|
}
|
|
|
|
static inline void btrfs_memcpy(struct btrfs_root *root,
|
|
void *dst_block,
|
|
void *dst, const void *src, size_t nr)
|
|
{
|
|
btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
|
|
memcpy(dst, src, nr);
|
|
}
|
|
|
|
static inline void btrfs_memmove(struct btrfs_root *root,
|
|
void *dst_block,
|
|
void *dst, void *src, size_t nr)
|
|
{
|
|
btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
|
|
memmove(dst, src, nr);
|
|
}
|
|
|
|
static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
|
|
{
|
|
WARN_ON(!atomic_read(&bh->b_count));
|
|
mark_buffer_dirty(bh);
|
|
}
|
|
|
|
/* 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((leaf)->items + (slot))))
|
|
|
|
/* extent-tree.c */
|
|
int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root);
|
|
struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root);
|
|
int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, u64 owner,
|
|
u64 num_blocks, u64 search_start,
|
|
u64 search_end, struct btrfs_key *ins);
|
|
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|
struct buffer_head *buf);
|
|
int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
|
|
*root, u64 blocknr, u64 num_blocks, int pin);
|
|
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 blocknr, u64 num_blocks);
|
|
int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root);
|
|
int btrfs_free_block_groups(struct btrfs_fs_info *info);
|
|
int btrfs_read_block_groups(struct btrfs_root *root);
|
|
/* ctree.c */
|
|
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 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);
|
|
void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
|
|
struct btrfs_path *btrfs_alloc_path(void);
|
|
void btrfs_free_path(struct btrfs_path *p);
|
|
void btrfs_init_path(struct btrfs_path *p);
|
|
int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|
struct btrfs_path *path);
|
|
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_item(struct btrfs_trans_handle *trans, struct btrfs_root
|
|
*root, struct btrfs_path *path, struct btrfs_key
|
|
*cpu_key, u32 data_size);
|
|
int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
|
|
int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
|
|
int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
|
|
*root, struct buffer_head *snap);
|
|
/* root-item.c */
|
|
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);
|
|
/* 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);
|
|
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_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);
|
|
/* inode-map.c */
|
|
int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *fs_root,
|
|
u64 dirid, u64 *objectid);
|
|
int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
|
|
|
|
/* inode-item.c */
|
|
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);
|
|
|
|
/* file-item.c */
|
|
int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
u64 objectid, u64 pos, u64 offset,
|
|
u64 num_blocks);
|
|
int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path, u64 objectid,
|
|
u64 blocknr, int mod);
|
|
int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
u64 objectid, u64 offset,
|
|
char *data, size_t len);
|
|
int btrfs_csum_verify_file_block(struct btrfs_root *root,
|
|
u64 objectid, u64 offset,
|
|
char *data, size_t len);
|
|
struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
u64 objectid, u64 offset,
|
|
int cow);
|
|
/* super.c */
|
|
extern struct subsystem btrfs_subsys;
|
|
|
|
#endif
|