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Btrfs: Optimizations for the extent_buffer code

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-10-15 16:14:27 -04:00
parent 5f39d397df
commit 479965d66e
4 changed files with 76 additions and 36 deletions
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48
fs/btrfs/ctree.h
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@@ -22,6 +22,7 @@
#include <linux/fs.h>
#include <linux/workqueue.h>
#include <linux/completion.h>
#include <asm/kmap_types.h>
#include "bit-radix.h"
#include "extent_map.h"
@@ -431,15 +432,52 @@ struct btrfs_root {
static inline u##bits btrfs_##name(struct extent_buffer *eb, \
type *s) \
{ \
__le##bits res; \
read_eb_member(eb, s, type, member, &res); \
return le##bits##_to_cpu(res); \
int err; \
char *map_token; \
char *kaddr; \
unsigned long map_start; \
unsigned long map_len; \
unsigned long offset = (unsigned long)s + \
offsetof(type, member); \
err = map_extent_buffer(eb, offset, \
sizeof(((type *)0)->member), \
&map_token, &kaddr, \
&map_start, &map_len, KM_USER0); \
if (!err) { \
__le##bits *tmp = (__le##bits *)(kaddr + offset - \
map_start); \
u##bits res = le##bits##_to_cpu(*tmp); \
unmap_extent_buffer(eb, map_token, KM_USER0); \
return res; \
} else { \
__le##bits res; \
read_eb_member(eb, s, type, member, &res); \
return le##bits##_to_cpu(res); \
} \
} \
static inline void btrfs_set_##name(struct extent_buffer *eb, \
type *s, u##bits val) \
{ \
val = cpu_to_le##bits(val); \
write_eb_member(eb, s, type, member, &val); \
int err; \
char *map_token; \
char *kaddr; \
unsigned long map_start; \
unsigned long map_len; \
unsigned long offset = (unsigned long)s + \
offsetof(type, member); \
err = map_extent_buffer(eb, offset, \
sizeof(((type *)0)->member), \
&map_token, &kaddr, \
&map_start, &map_len, KM_USER0); \
if (!err) { \
__le##bits *tmp = (__le##bits *)(kaddr + offset - \
map_start); \
*tmp = cpu_to_le##bits(val); \
unmap_extent_buffer(eb, map_token, KM_USER0); \
} else { \
val = cpu_to_le##bits(val); \
write_eb_member(eb, s, type, member, &val); \
} \
}
#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \