1035 lines
32 KiB
C
1035 lines
32 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __BTRFS__
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#define __BTRFS__
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#include <linux/fs.h>
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#include <linux/workqueue.h>
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#include <linux/completion.h>
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#include "bit-radix.h"
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#include "extent_map.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_trans_handle_cachep;
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extern struct kmem_cache *btrfs_transaction_cachep;
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extern struct kmem_cache *btrfs_bit_radix_cachep;
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extern struct kmem_cache *btrfs_path_cachep;
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#define BTRFS_MAGIC "_B2RfS_M"
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#define BTRFS_ROOT_TREE_OBJECTID 1ULL
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#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
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#define BTRFS_FS_TREE_OBJECTID 3ULL
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#define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
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#define BTRFS_FIRST_FREE_OBJECTID 5ULL
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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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/* four bytes for CRC32 */
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#define BTRFS_CRC32_SIZE 4
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#define BTRFS_EMPTY_DIR_SIZE 6
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#define BTRFS_FT_UNKNOWN 0
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#define BTRFS_FT_REG_FILE 1
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#define BTRFS_FT_DIR 2
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#define BTRFS_FT_CHRDEV 3
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#define BTRFS_FT_BLKDEV 4
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#define BTRFS_FT_FIFO 5
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#define BTRFS_FT_SOCK 6
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#define BTRFS_FT_SYMLINK 7
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#define BTRFS_FT_MAX 8
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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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u8 type;
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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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u8 type;
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u64 offset;
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} __attribute__ ((__packed__));
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#define BTRFS_FSID_SIZE 16
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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[BTRFS_FSID_SIZE]; /* 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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__le32 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)->nodesize - \
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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->leafsize))
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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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/*
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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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__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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__le32 sectorsize;
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__le32 nodesize;
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__le32 leafsize;
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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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__le32 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 extent_buffer *nodes[BTRFS_MAX_LEVEL];
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int slots[BTRFS_MAX_LEVEL];
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int reada;
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int lowest_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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__le64 block_group;
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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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__le64 block_limit;
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__le64 blocks_used;
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__le32 flags;
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__le32 refs;
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struct btrfs_disk_key drop_progress;
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u8 drop_level;
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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;
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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_AVAIL 1
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#define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
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#define BTRFS_BLOCK_GROUP_DATA 1
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struct btrfs_block_group_item {
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__le64 used;
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u8 flags;
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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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struct radix_tree_root *radix;
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u64 first_free;
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u64 last_alloc;
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u64 pinned;
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u64 last_prealloc;
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int data;
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int cached;
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};
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struct btrfs_fs_info {
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u8 fsid[BTRFS_FSID_SIZE];
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struct btrfs_root *extent_root;
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struct btrfs_root *tree_root;
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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 block_group_radix;
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struct radix_tree_root block_group_data_radix;
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struct radix_tree_root extent_map_radix;
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struct radix_tree_root extent_ins_radix;
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u64 generation;
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u64 last_trans_committed;
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struct btrfs_transaction *running_transaction;
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struct btrfs_super_block super_copy;
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struct extent_buffer *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 list_head dead_roots;
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struct delayed_work trans_work;
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struct kobject super_kobj;
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struct completion kobj_unregister;
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int do_barriers;
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int closing;
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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 extent_buffer *node;
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struct extent_buffer *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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struct kobject root_kobj;
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struct completion kobj_unregister;
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struct rw_semaphore snap_sem;
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u64 objectid;
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u64 last_trans;
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/* data allocations are done in sectorsize units */
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u32 sectorsize;
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/* node allocations are done in nodesize units */
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u32 nodesize;
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/* leaf allocations are done in leafsize units */
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u32 leafsize;
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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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int ref_cows;
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struct btrfs_key defrag_progress;
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int defrag_running;
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int defrag_level;
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char *name;
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};
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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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* 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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/* some macros to generate set/get funcs for the struct fields. This
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* assumes there is a lefoo_to_cpu for every type, so lets make a simple
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* one for u8:
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*/
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#define le8_to_cpu(v) (v)
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#define cpu_to_le8(v) (v)
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#define __le8 u8
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#define read_eb_member(eb, ptr, type, member, result) ( \
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read_extent_buffer(eb, (char *)(result), \
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((unsigned long)(ptr)) + \
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offsetof(type, member), \
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sizeof(((type *)0)->member)))
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#define write_eb_member(eb, ptr, type, member, result) ( \
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write_extent_buffer(eb, (char *)(result), \
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((unsigned long)(ptr)) + \
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offsetof(type, member), \
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sizeof(((type *)0)->member)))
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#define BTRFS_SETGET_FUNCS(name, type, member, bits) \
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static inline u##bits btrfs_##name(struct extent_buffer *eb, \
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type *s) \
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{ \
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__le##bits res; \
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read_eb_member(eb, s, type, member, &res); \
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return le##bits##_to_cpu(res); \
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} \
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static inline void btrfs_set_##name(struct extent_buffer *eb, \
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type *s, u##bits val) \
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{ \
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val = cpu_to_le##bits(val); \
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write_eb_member(eb, s, type, member, &val); \
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}
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#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
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static inline u##bits btrfs_##name(struct extent_buffer *eb) \
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{ \
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__le##bits res; \
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read_eb_member(eb, NULL, type, member, &res); \
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return le##bits##_to_cpu(res); \
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} \
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static inline void btrfs_set_##name(struct extent_buffer *eb, \
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u##bits val) \
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{ \
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val = cpu_to_le##bits(val); \
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write_eb_member(eb, NULL, type, member, &val); \
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}
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#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
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static inline u##bits btrfs_##name(type *s) \
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{ \
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return le##bits##_to_cpu(s->member); \
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} \
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static inline void btrfs_set_##name(type *s, u##bits val) \
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{ \
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s->member = cpu_to_le##bits(val); \
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}
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/* struct btrfs_block_group_item */
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BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
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used, 64);
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BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
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used, 64);
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/* struct btrfs_inode_item */
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BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
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BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
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BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
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BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
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BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
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BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
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BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
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BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
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BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
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BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
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BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
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compat_flags, 16);
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static inline struct btrfs_inode_timespec *
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btrfs_inode_atime(struct btrfs_inode_item *inode_item)
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{
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unsigned long ptr = (unsigned long)inode_item;
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ptr += offsetof(struct btrfs_inode_item, atime);
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return (struct btrfs_inode_timespec *)ptr;
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}
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static inline struct btrfs_inode_timespec *
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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_inode_timespec *)ptr;
|
|
}
|
|
|
|
static inline struct btrfs_inode_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_inode_timespec *)ptr;
|
|
}
|
|
|
|
static inline struct btrfs_inode_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_inode_timespec *)ptr;
|
|
}
|
|
|
|
BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
|
|
BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
|
|
|
|
/* struct btrfs_extent_item */
|
|
BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
|
|
BTRFS_SETGET_FUNCS(extent_owner, struct btrfs_extent_item, owner, 32);
|
|
|
|
BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
|
|
refs, 32);
|
|
BTRFS_SETGET_STACK_FUNCS(stack_extent_owner, struct btrfs_extent_item,
|
|
owner, 32);
|
|
|
|
/* struct btrfs_node */
|
|
BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
|
|
|
|
static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
|
|
{
|
|
unsigned long ptr;
|
|
ptr = offsetof(struct btrfs_node, ptrs) +
|
|
sizeof(struct btrfs_key_ptr) * nr;
|
|
return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
|
|
}
|
|
|
|
static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
|
|
int nr, u64 val)
|
|
{
|
|
unsigned long ptr;
|
|
ptr = offsetof(struct btrfs_node, ptrs) +
|
|
sizeof(struct btrfs_key_ptr) * nr;
|
|
btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
|
|
}
|
|
|
|
static unsigned long btrfs_node_key_ptr_offset(int nr)
|
|
{
|
|
return offsetof(struct btrfs_node, ptrs) +
|
|
sizeof(struct btrfs_key_ptr) * nr;
|
|
}
|
|
|
|
static void btrfs_node_key(struct extent_buffer *eb,
|
|
struct btrfs_disk_key *disk_key, int nr)
|
|
{
|
|
unsigned long ptr;
|
|
ptr = btrfs_node_key_ptr_offset(nr);
|
|
read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
|
|
struct btrfs_key_ptr, key, disk_key);
|
|
}
|
|
static inline void btrfs_set_node_key(struct extent_buffer *eb,
|
|
struct btrfs_disk_key *disk_key, int nr)
|
|
{
|
|
unsigned long ptr;
|
|
ptr = btrfs_node_key_ptr_offset(nr);
|
|
write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
|
|
struct btrfs_key_ptr, key, disk_key);
|
|
}
|
|
|
|
/* struct btrfs_item */
|
|
BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
|
|
BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
|
|
|
|
static inline unsigned long btrfs_item_nr_offset(int nr)
|
|
{
|
|
return offsetof(struct btrfs_leaf, items) +
|
|
sizeof(struct btrfs_item) * nr;
|
|
}
|
|
|
|
static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
|
|
int nr)
|
|
{
|
|
return (struct btrfs_item *)btrfs_item_nr_offset(nr);
|
|
}
|
|
|
|
static inline u32 btrfs_item_end(struct extent_buffer *eb,
|
|
struct btrfs_item *item)
|
|
{
|
|
return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
|
|
}
|
|
|
|
static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
|
|
{
|
|
return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
|
|
}
|
|
|
|
static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
|
|
{
|
|
return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
|
|
}
|
|
|
|
static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
|
|
{
|
|
return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
|
|
}
|
|
|
|
static inline void btrfs_item_key(struct extent_buffer *eb,
|
|
struct btrfs_disk_key *disk_key, int nr)
|
|
{
|
|
struct btrfs_item *item = btrfs_item_nr(eb, nr);
|
|
read_eb_member(eb, item, struct btrfs_item, key, disk_key);
|
|
}
|
|
|
|
static inline void btrfs_set_item_key(struct extent_buffer *eb,
|
|
struct btrfs_disk_key *disk_key, int nr)
|
|
{
|
|
struct btrfs_item *item = btrfs_item_nr(eb, nr);
|
|
write_eb_member(eb, item, struct btrfs_item, key, disk_key);
|
|
}
|
|
|
|
/* struct btrfs_dir_item */
|
|
BTRFS_SETGET_FUNCS(dir_flags, struct btrfs_dir_item, flags, 16);
|
|
BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
|
|
BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
|
|
|
|
static inline void btrfs_dir_item_key(struct extent_buffer *eb,
|
|
struct btrfs_dir_item *item,
|
|
struct btrfs_disk_key *key)
|
|
{
|
|
read_eb_member(eb, item, struct btrfs_dir_item, location, key);
|
|
}
|
|
|
|
static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
|
|
struct btrfs_dir_item *item,
|
|
struct btrfs_disk_key *key)
|
|
{
|
|
write_eb_member(eb, item, struct btrfs_dir_item, location, key);
|
|
}
|
|
|
|
/* struct btrfs_disk_key */
|
|
BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
|
|
objectid, 64);
|
|
BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
|
|
BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
|
|
|
|
static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
|
|
struct btrfs_disk_key *disk)
|
|
{
|
|
cpu->offset = le64_to_cpu(disk->offset);
|
|
cpu->type = disk->type;
|
|
cpu->objectid = le64_to_cpu(disk->objectid);
|
|
}
|
|
|
|
static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
|
|
struct btrfs_key *cpu)
|
|
{
|
|
disk->offset = cpu_to_le64(cpu->offset);
|
|
disk->type = cpu->type;
|
|
disk->objectid = cpu_to_le64(cpu->objectid);
|
|
}
|
|
|
|
static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
|
|
struct btrfs_key *key, int nr)
|
|
{
|
|
struct btrfs_disk_key disk_key;
|
|
btrfs_node_key(eb, &disk_key, nr);
|
|
btrfs_disk_key_to_cpu(key, &disk_key);
|
|
}
|
|
|
|
static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
|
|
struct btrfs_key *key, int nr)
|
|
{
|
|
struct btrfs_disk_key disk_key;
|
|
btrfs_item_key(eb, &disk_key, nr);
|
|
btrfs_disk_key_to_cpu(key, &disk_key);
|
|
}
|
|
|
|
static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
|
|
struct btrfs_dir_item *item,
|
|
struct btrfs_key *key)
|
|
{
|
|
struct btrfs_disk_key disk_key;
|
|
btrfs_dir_item_key(eb, item, &disk_key);
|
|
btrfs_disk_key_to_cpu(key, &disk_key);
|
|
}
|
|
|
|
|
|
static inline u8 btrfs_key_type(struct btrfs_key *key)
|
|
{
|
|
return key->type;
|
|
}
|
|
|
|
static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
|
|
{
|
|
key->type = val;
|
|
}
|
|
|
|
/* struct btrfs_header */
|
|
BTRFS_SETGET_HEADER_FUNCS(header_blocknr, struct btrfs_header, blocknr, 64);
|
|
BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
|
|
generation, 64);
|
|
BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
|
|
BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
|
|
BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
|
|
BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
|
|
|
|
static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
|
|
{
|
|
unsigned long ptr = offsetof(struct btrfs_header, fsid);
|
|
return (u8 *)ptr;
|
|
}
|
|
|
|
static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
|
|
{
|
|
unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
|
|
return (u8 *)ptr;
|
|
}
|
|
|
|
static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
|
|
{
|
|
unsigned long ptr = offsetof(struct btrfs_header, csum);
|
|
return (u8 *)ptr;
|
|
}
|
|
|
|
static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline int btrfs_is_leaf(struct extent_buffer *eb)
|
|
{
|
|
return (btrfs_header_level(eb) == 0);
|
|
}
|
|
|
|
/* struct btrfs_root_item */
|
|
BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
|
|
BTRFS_SETGET_FUNCS(disk_root_blocknr, struct btrfs_root_item, blocknr, 64);
|
|
|
|
BTRFS_SETGET_STACK_FUNCS(root_blocknr, struct btrfs_root_item, blocknr, 64);
|
|
BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
|
|
BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
|
|
BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
|
|
BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, blocks_used, 64);
|
|
BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, block_limit, 64);
|
|
|
|
/* struct btrfs_super_block */
|
|
BTRFS_SETGET_STACK_FUNCS(super_blocknr, struct btrfs_super_block, blocknr, 64);
|
|
BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
|
|
generation, 64);
|
|
BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
|
|
BTRFS_SETGET_STACK_FUNCS(super_total_blocks, struct btrfs_super_block,
|
|
total_blocks, 64);
|
|
BTRFS_SETGET_STACK_FUNCS(super_blocks_used, struct btrfs_super_block,
|
|
blocks_used, 64);
|
|
BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
|
|
sectorsize, 32);
|
|
BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
|
|
nodesize, 32);
|
|
BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
|
|
leafsize, 32);
|
|
BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
|
|
root_dir_objectid, 64);
|
|
|
|
static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
|
|
{
|
|
return offsetof(struct btrfs_leaf, items);
|
|
}
|
|
|
|
/* struct btrfs_file_extent_item */
|
|
BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
|
|
|
|
static inline unsigned long btrfs_file_extent_inline_start(struct
|
|
btrfs_file_extent_item *e)
|
|
{
|
|
unsigned long offset = (unsigned long)e;
|
|
offset += offsetof(struct btrfs_file_extent_item, disk_blocknr);
|
|
return offset;
|
|
}
|
|
|
|
static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
|
|
{
|
|
return offsetof(struct btrfs_file_extent_item, disk_blocknr) + datasize;
|
|
}
|
|
|
|
static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
|
|
struct btrfs_item *e)
|
|
{
|
|
unsigned long offset;
|
|
offset = offsetof(struct btrfs_file_extent_item, disk_blocknr);
|
|
return btrfs_item_size(eb, e) - offset;
|
|
}
|
|
|
|
BTRFS_SETGET_FUNCS(file_extent_disk_blocknr, struct btrfs_file_extent_item,
|
|
disk_blocknr, 64);
|
|
BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
|
|
generation, 64);
|
|
BTRFS_SETGET_FUNCS(file_extent_disk_num_blocks, struct btrfs_file_extent_item,
|
|
disk_num_blocks, 64);
|
|
BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
|
|
offset, 64);
|
|
BTRFS_SETGET_FUNCS(file_extent_num_blocks, struct btrfs_file_extent_item,
|
|
num_blocks, 64);
|
|
|
|
static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
|
|
{
|
|
return sb->s_fs_info;
|
|
}
|
|
|
|
static inline int btrfs_set_root_name(struct btrfs_root *root,
|
|
const char *name, int len)
|
|
{
|
|
/* if we already have a name just free it */
|
|
if (root->name)
|
|
kfree(root->name);
|
|
|
|
root->name = kmalloc(len+1, GFP_KERNEL);
|
|
if (!root->name)
|
|
return -ENOMEM;
|
|
|
|
memcpy(root->name, name, len);
|
|
root->name[len] ='\0';
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* helper function to cast into the data area of the leaf. */
|
|
#define btrfs_item_ptr(leaf, slot, type) \
|
|
((type *)(btrfs_leaf_data(leaf) + \
|
|
btrfs_item_offset_nr(leaf, slot)))
|
|
|
|
#define btrfs_item_ptr_offset(leaf, slot) \
|
|
((unsigned long)(btrfs_leaf_data(leaf) + \
|
|
btrfs_item_offset_nr(leaf, slot)))
|
|
|
|
/* mount option defines and helpers */
|
|
#define BTRFS_MOUNT_SUBVOL 0x000001
|
|
#define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
|
|
#define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
|
|
#define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
|
|
BTRFS_MOUNT_##opt)
|
|
/* extent-tree.c */
|
|
int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root);
|
|
int btrfs_copy_pinned(struct btrfs_root *root, struct radix_tree_root *copy);
|
|
struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
|
|
btrfs_fs_info *info,
|
|
u64 blocknr);
|
|
struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
|
|
struct btrfs_block_group_cache
|
|
*hint, u64 search_start,
|
|
int data, int owner);
|
|
int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root);
|
|
struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, u64 hint,
|
|
u64 empty_size);
|
|
int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, u64 owner,
|
|
u64 num_blocks, u64 empty_size, u64 search_start,
|
|
u64 search_end, struct btrfs_key *ins, int data);
|
|
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|
struct extent_buffer *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,
|
|
struct radix_tree_root *unpin_radix);
|
|
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_cow_block(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, struct extent_buffer *buf,
|
|
struct extent_buffer *parent, int parent_slot,
|
|
struct extent_buffer **cow_ret);
|
|
int btrfs_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);
|
|
int btrfs_realloc_node(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, struct extent_buffer *parent,
|
|
int cache_only, u64 *last_ret);
|
|
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
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*root, struct btrfs_key *key, void *data, u32 data_size);
|
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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);
|
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int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
|
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int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
|
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int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
|
|
*root);
|
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/* root-item.c */
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int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|
struct btrfs_key *key);
|
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int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
|
|
*root, struct btrfs_key *key, struct btrfs_root_item
|
|
*item);
|
|
int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
|
|
*root, struct btrfs_key *key, struct btrfs_root_item
|
|
*item);
|
|
int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
|
|
btrfs_root_item *item, struct btrfs_key *key);
|
|
int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
|
|
struct btrfs_root *latest_root);
|
|
/* 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_empty_inode(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path, u64 objectid);
|
|
int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
|
|
*root, struct btrfs_path *path,
|
|
struct btrfs_key *location, int mod);
|
|
|
|
/* file-item.c */
|
|
int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
u64 objectid, u64 pos, u64 offset,
|
|
u64 disk_num_blocks,
|
|
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);
|
|
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);
|
|
int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, struct btrfs_path *path,
|
|
u64 isize);
|
|
/* inode.c */
|
|
int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
|
|
int btrfs_readpage(struct file *file, struct page *page);
|
|
void btrfs_delete_inode(struct inode *inode);
|
|
void btrfs_read_locked_inode(struct inode *inode);
|
|
int btrfs_write_inode(struct inode *inode, int wait);
|
|
void btrfs_dirty_inode(struct inode *inode);
|
|
struct inode *btrfs_alloc_inode(struct super_block *sb);
|
|
void btrfs_destroy_inode(struct inode *inode);
|
|
int btrfs_init_cachep(void);
|
|
void btrfs_destroy_cachep(void);
|
|
long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
|
|
struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
|
|
struct btrfs_root *root);
|
|
int btrfs_commit_write(struct file *file, struct page *page,
|
|
unsigned from, unsigned to);
|
|
struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
|
|
size_t page_offset, u64 start, u64 end,
|
|
int create);
|
|
int btrfs_update_inode(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct inode *inode);
|
|
/* file.c */
|
|
int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
|
|
extern struct file_operations btrfs_file_operations;
|
|
int btrfs_drop_extents(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, struct inode *inode,
|
|
u64 start, u64 end, u64 *hint_block);
|
|
/* tree-defrag.c */
|
|
int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, int cache_only);
|
|
|
|
/* sysfs.c */
|
|
int btrfs_init_sysfs(void);
|
|
void btrfs_exit_sysfs(void);
|
|
int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
|
|
int btrfs_sysfs_add_root(struct btrfs_root *root);
|
|
void btrfs_sysfs_del_root(struct btrfs_root *root);
|
|
void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
|
|
|
|
#endif
|