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Btrfs: get/set for struct header fields

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-03-12 12:01:18 -04:00
committed by David Woodhouse
parent 83e15a28e0
commit 7518a238ea
10 changed files with 230 additions and 172 deletions
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63
fs/btrfs/ctree.h
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@@ -35,13 +35,10 @@ struct header {
/* generation flags to be added */
} __attribute__ ((__packed__));
#define MAX_LEVEL 8
#define NODEPTRS_PER_BLOCK ((CTREE_BLOCKSIZE - sizeof(struct header)) / \
(sizeof(struct key) + sizeof(u64)))
#define MAX_LEVEL 8
#define node_level(f) ((f) & (MAX_LEVEL-1))
#define is_leaf(f) (node_level(f) == 0)
struct tree_buffer;
/*
@@ -144,6 +141,64 @@ struct ctree_path {
int slots[MAX_LEVEL];
};
static inline u64 btrfs_header_blocknr(struct header *h)
{
return h->blocknr;
}
static inline void btrfs_set_header_blocknr(struct header *h, u64 blocknr)
{
h->blocknr = blocknr;
}
static inline u64 btrfs_header_parentid(struct header *h)
{
return h->parentid;
}
static inline void btrfs_set_header_parentid(struct header *h, u64 parentid)
{
h->parentid = parentid;
}
static inline u32 btrfs_header_nritems(struct header *h)
{
return h->nritems;
}
static inline void btrfs_set_header_nritems(struct header *h, u32 val)
{
h->nritems = val;
}
static inline u32 btrfs_header_flags(struct header *h)
{
return h->flags;
}
static inline void btrfs_set_header_flags(struct header *h, u32 val)
{
h->flags = val;
}
static inline int btrfs_header_level(struct header *h)
{
return btrfs_header_flags(h) & (MAX_LEVEL - 1);
}
static inline void btrfs_set_header_level(struct header *h, int level)
{
u32 flags;
BUG_ON(level > MAX_LEVEL);
flags = btrfs_header_flags(h) & ~(MAX_LEVEL - 1);
btrfs_set_header_flags(h, flags | level);
}
static inline int btrfs_is_leaf(struct node *n)
{
return (btrfs_header_level(&n->header) == 0);
}
struct tree_buffer *alloc_free_block(struct ctree_root *root);
int btrfs_inc_ref(struct ctree_root *root, struct tree_buffer *buf);
int free_extent(struct ctree_root *root, u64 blocknr, u64 num_blocks);