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Btrfs: add the ability to cache a pointer into the eb

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This cuts down on the CPU time used by map_private_extent_buffer

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2012-03-03 07:40:03 -05:00
parent 0b32f4bbb4
commit cfed81a04e
3 changed files with 116 additions and 30 deletions
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13
fs/btrfs/ctree.h
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@@ -1546,6 +1546,17 @@ struct btrfs_ioctl_defrag_range_args {
#define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31)
struct btrfs_map_token {
struct extent_buffer *eb;
char *kaddr;
unsigned long offset;
};
static inline void btrfs_init_map_token (struct btrfs_map_token *token)
{
memset(token, 0, sizeof(*token));
}
/* some macros to generate set/get funcs for the struct fields. This
* assumes there is a lefoo_to_cpu for every type, so lets make a simple
* one for u8:
@@ -1569,6 +1580,8 @@ struct btrfs_ioctl_defrag_range_args {
#ifndef BTRFS_SETGET_FUNCS
#define BTRFS_SETGET_FUNCS(name, type, member, bits) \
u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, struct btrfs_map_token *token); \
void btrfs_set_token_##name(struct extent_buffer *eb, type *s, u##bits val, struct btrfs_map_token *token);\
void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
#endif