2007-02-02 15:18:22 +01:00
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#ifndef __CTREE__
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#define __CTREE__
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2007-03-02 00:59:40 +01:00
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#include "list.h"
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2007-02-26 16:40:21 +01:00
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#define CTREE_BLOCKSIZE 1024
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2007-02-02 15:18:22 +01:00
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2007-02-26 16:40:21 +01:00
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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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2007-02-02 15:18:22 +01:00
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struct 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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2007-02-26 16:40:21 +01:00
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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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2007-02-02 15:18:22 +01:00
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struct header {
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u64 fsid[2]; /* FS specific uuid */
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2007-02-26 16:40:21 +01:00
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u64 blocknr; /* which block this node is supposed to live in */
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u64 parentid; /* objectid of the tree root */
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2007-02-02 15:18:22 +01:00
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u32 csum;
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u32 ham;
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u16 nritems;
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u16 flags;
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2007-02-26 16:40:21 +01:00
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/* generation flags to be added */
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2007-02-02 15:18:22 +01:00
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} __attribute__ ((__packed__));
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2007-03-12 17:01:18 +01:00
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#define MAX_LEVEL 8
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2007-02-02 15:18:22 +01:00
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#define NODEPTRS_PER_BLOCK ((CTREE_BLOCKSIZE - sizeof(struct header)) / \
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(sizeof(struct key) + sizeof(u64)))
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struct tree_buffer;
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2007-02-20 22:40:44 +01:00
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2007-02-26 16:40:21 +01:00
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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. current_insert is used
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* only for the extent tree.
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*/
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2007-02-02 15:18:22 +01:00
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struct ctree_root {
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struct tree_buffer *node;
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2007-03-07 02:08:01 +01:00
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struct tree_buffer *commit_root;
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2007-02-20 22:40:44 +01:00
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struct ctree_root *extent_root;
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2007-02-23 14:38:36 +01:00
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struct key current_insert;
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2007-03-07 22:15:30 +01:00
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struct key last_insert;
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2007-02-02 15:18:22 +01:00
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int fp;
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struct radix_tree_root cache_radix;
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2007-03-07 02:08:01 +01:00
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struct radix_tree_root pinned_radix;
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2007-03-02 00:59:40 +01:00
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struct list_head trans;
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struct list_head cache;
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int cache_size;
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2007-02-02 15:18:22 +01:00
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};
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2007-02-26 16:40:21 +01:00
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/*
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* describes a tree on disk
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*/
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2007-02-20 22:40:44 +01:00
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struct ctree_root_info {
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u64 fsid[2]; /* FS specific uuid */
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u64 blocknr; /* blocknr of this block */
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u64 objectid; /* inode number of this root */
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2007-02-26 16:40:21 +01:00
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u64 tree_root; /* the tree root block */
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2007-02-20 22:40:44 +01:00
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u32 csum;
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u32 ham;
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u64 snapuuid[2]; /* root specific uuid */
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} __attribute__ ((__packed__));
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2007-02-26 16:40:21 +01:00
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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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2007-02-21 23:04:57 +01:00
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struct ctree_super_block {
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struct ctree_root_info root_info;
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struct ctree_root_info extent_info;
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} __attribute__ ((__packed__));
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2007-02-26 16:40:21 +01:00
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/*
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* A leaf is full of items. The exact type of item is defined by
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* the key flags parameter. 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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2007-02-02 15:18:22 +01:00
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struct item {
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struct key key;
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u16 offset;
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u16 size;
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} __attribute__ ((__packed__));
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2007-02-26 16:40:21 +01:00
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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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2007-02-02 15:18:22 +01:00
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#define LEAF_DATA_SIZE (CTREE_BLOCKSIZE - sizeof(struct header))
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struct leaf {
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struct header header;
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union {
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struct item items[LEAF_DATA_SIZE/sizeof(struct item)];
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u8 data[CTREE_BLOCKSIZE-sizeof(struct header)];
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};
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} __attribute__ ((__packed__));
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2007-02-26 16:40:21 +01:00
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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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2007-02-02 15:18:22 +01:00
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struct node {
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struct header header;
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struct key keys[NODEPTRS_PER_BLOCK];
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u64 blockptrs[NODEPTRS_PER_BLOCK];
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} __attribute__ ((__packed__));
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2007-02-26 16:40:21 +01:00
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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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2007-02-20 22:40:44 +01:00
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struct extent_item {
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u32 refs;
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u64 owner;
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} __attribute__ ((__packed__));
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2007-02-26 16:40:21 +01:00
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/*
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* ctree_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...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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2007-02-02 15:18:22 +01:00
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struct ctree_path {
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struct tree_buffer *nodes[MAX_LEVEL];
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int slots[MAX_LEVEL];
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};
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2007-02-24 12:24:44 +01:00
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2007-03-12 17:01:18 +01:00
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static inline u64 btrfs_header_blocknr(struct header *h)
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{
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return h->blocknr;
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}
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static inline void btrfs_set_header_blocknr(struct header *h, u64 blocknr)
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{
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h->blocknr = blocknr;
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}
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static inline u64 btrfs_header_parentid(struct header *h)
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{
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return h->parentid;
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}
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static inline void btrfs_set_header_parentid(struct header *h, u64 parentid)
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{
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h->parentid = parentid;
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}
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static inline u32 btrfs_header_nritems(struct header *h)
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{
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return h->nritems;
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}
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static inline void btrfs_set_header_nritems(struct header *h, u32 val)
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{
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h->nritems = val;
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}
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static inline u32 btrfs_header_flags(struct header *h)
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{
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return h->flags;
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}
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static inline void btrfs_set_header_flags(struct header *h, u32 val)
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{
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h->flags = val;
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}
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static inline int btrfs_header_level(struct header *h)
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{
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return btrfs_header_flags(h) & (MAX_LEVEL - 1);
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}
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static inline void btrfs_set_header_level(struct header *h, int level)
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{
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u32 flags;
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BUG_ON(level > MAX_LEVEL);
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flags = btrfs_header_flags(h) & ~(MAX_LEVEL - 1);
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btrfs_set_header_flags(h, flags | level);
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}
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static inline int btrfs_is_leaf(struct node *n)
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{
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return (btrfs_header_level(&n->header) == 0);
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}
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2007-02-24 12:24:44 +01:00
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struct tree_buffer *alloc_free_block(struct ctree_root *root);
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2007-03-02 22:08:05 +01:00
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int btrfs_inc_ref(struct ctree_root *root, struct tree_buffer *buf);
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2007-02-24 12:24:44 +01:00
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int free_extent(struct ctree_root *root, u64 blocknr, u64 num_blocks);
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2007-03-02 22:08:05 +01:00
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int search_slot(struct ctree_root *root, struct key *key, struct ctree_path *p, int ins_len, int cow);
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2007-02-24 12:24:44 +01:00
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void release_path(struct ctree_root *root, struct ctree_path *p);
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void init_path(struct ctree_path *p);
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int del_item(struct ctree_root *root, struct ctree_path *path);
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int insert_item(struct ctree_root *root, struct key *key, void *data, int data_size);
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int next_leaf(struct ctree_root *root, struct ctree_path *path);
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int leaf_free_space(struct leaf *leaf);
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2007-03-07 02:08:01 +01:00
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int btrfs_drop_snapshot(struct ctree_root *root, struct tree_buffer *snap);
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int btrfs_finish_extent_commit(struct ctree_root *root);
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2007-02-02 15:18:22 +01:00
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#endif
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