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Btrfs: early extent mapping support

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-02-20 16:40:44 -05:00
committed by David Woodhouse
parent 74123bd72a
commit d97e63b69e
5 changed files with 236 additions and 33 deletions
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34
fs/btrfs/ctree.h
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@@ -1,7 +1,7 @@
#ifndef __CTREE__
#define __CTREE__
#define CTREE_BLOCKSIZE 4096
#define CTREE_BLOCKSIZE 256
struct key {
u64 objectid;
@@ -22,18 +22,41 @@ struct header {
#define NODEPTRS_PER_BLOCK ((CTREE_BLOCKSIZE - sizeof(struct header)) / \
(sizeof(struct key) + sizeof(u64)))
#define LEVEL_BITS 3
#define MAX_LEVEL (1 << LEVEL_BITS)
#define MAX_LEVEL 8
#define node_level(f) ((f) & (MAX_LEVEL-1))
#define is_leaf(f) (node_level(f) == 0)
struct tree_buffer;
struct alloc_extent {
u64 blocknr;
u64 num_blocks;
u64 num_used;
} __attribute__ ((__packed__));
struct ctree_root {
struct tree_buffer *node;
struct ctree_root *extent_root;
struct alloc_extent *alloc_extent;
struct alloc_extent *reserve_extent;
int fp;
struct radix_tree_root cache_radix;
struct alloc_extent ai1;
struct alloc_extent ai2;
};
struct ctree_root_info {
u64 fsid[2]; /* FS specific uuid */
u64 blocknr; /* blocknr of this block */
u64 objectid; /* inode number of this root */
u64 tree_root; /* the tree root */
u32 csum;
u32 ham;
struct alloc_extent alloc_extent;
struct alloc_extent reserve_extent;
u64 snapuuid[2]; /* root specific uuid */
} __attribute__ ((__packed__));
struct item {
struct key key;
u16 offset;
@@ -55,6 +78,11 @@ struct node {
u64 blockptrs[NODEPTRS_PER_BLOCK];
} __attribute__ ((__packed__));
struct extent_item {
u32 refs;
u64 owner;
} __attribute__ ((__packed__));
struct ctree_path {
struct tree_buffer *nodes[MAX_LEVEL];
int slots[MAX_LEVEL];