forked from Minki/linux
63 lines
1.2 KiB
C
63 lines
1.2 KiB
C
#ifndef __CTREE__
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#define __CTREE__
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#define CTREE_BLOCKSIZE 4096
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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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struct header {
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u64 fsid[2]; /* FS specific uuid */
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u64 blocknr;
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u64 parentid;
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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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} __attribute__ ((__packed__));
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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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#define LEVEL_BITS 3
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#define MAX_LEVEL (1 << LEVEL_BITS)
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#define node_level(f) ((f) & (MAX_LEVEL-1))
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#define is_leaf(f) (node_level(f) == 0)
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struct tree_buffer;
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struct ctree_root {
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struct tree_buffer *node;
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int fp;
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struct radix_tree_root cache_radix;
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};
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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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#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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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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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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#endif
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