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Btrfs: extent_map optimizations to cut down on CPU usage

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-10-15 16:18:55 -04:00
parent 3326d1b07c
commit 810191ff30
6 changed files with 40 additions and 91 deletions
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74
fs/btrfs/ctree.h
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@ -19,6 +19,8 @@
#ifndef __BTRFS__
#define __BTRFS__
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/fs.h>
#include <linux/workqueue.h>
#include <linux/completion.h>
@ -499,70 +501,22 @@ static inline void btrfs_set_##name(struct extent_buffer *eb, \
#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
static inline u##bits btrfs_##name(struct extent_buffer *eb) \
{ \
int err; \
char *map_token; \
char *kaddr; \
unsigned long map_start; \
unsigned long map_len; \
char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
unsigned long offset = offsetof(type, member); \
int unmap_on_exit = (eb->map_token == NULL); \
if (eb->map_token && offset >= eb->map_start && \
offset + sizeof(((type *)0)->member) <= eb->map_start + \
eb->map_len) { \
kaddr = eb->kaddr; \
map_start = eb->map_start; \
err = 0; \
} else { \
err = map_extent_buffer(eb, offset, \
sizeof(((type *)0)->member), \
&map_token, &kaddr, \
&map_start, &map_len, KM_USER1); \
} \
if (!err) { \
__le##bits *tmp = (__le##bits *)(kaddr + offset - \
map_start); \
u##bits res = le##bits##_to_cpu(*tmp); \
if (unmap_on_exit) \
unmap_extent_buffer(eb, map_token, KM_USER1); \
return res; \
} else { \
__le##bits res; \
read_eb_member(eb, NULL, type, member, &res); \
return le##bits##_to_cpu(res); \
} \
u##bits res; \
__le##bits *tmp = (__le##bits *)(kaddr + offset); \
res = le##bits##_to_cpu(*tmp); \
kunmap_atomic(kaddr, KM_USER0); \
return res; \
} \
static inline void btrfs_set_##name(struct extent_buffer *eb, \
u##bits val) \
{ \
int err; \
char *map_token; \
char *kaddr; \
unsigned long map_start; \
unsigned long map_len; \
char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
unsigned long offset = offsetof(type, member); \
int unmap_on_exit = (eb->map_token == NULL); \
if (eb->map_token && offset >= eb->map_start && \
offset + sizeof(((type *)0)->member) <= eb->map_start + \
eb->map_len) { \
kaddr = eb->kaddr; \
map_start = eb->map_start; \
err = 0; \
} else { \
err = map_extent_buffer(eb, offset, \
sizeof(((type *)0)->member), \
&map_token, &kaddr, \
&map_start, &map_len, KM_USER1); \
} \
if (!err) { \
__le##bits *tmp = (__le##bits *)(kaddr + offset - \
map_start); \
*tmp = cpu_to_le##bits(val); \
if (unmap_on_exit) \
unmap_extent_buffer(eb, map_token, KM_USER1); \
} else { \
val = cpu_to_le##bits(val); \
write_eb_member(eb, NULL, type, member, &val); \
} \
__le##bits *tmp = (__le##bits *)(kaddr + offset); \
*tmp = cpu_to_le##bits(val); \
kunmap_atomic(kaddr, KM_USER0); \
}
#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
@ -659,13 +613,13 @@ static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
}
static unsigned long btrfs_node_key_ptr_offset(int nr)
static inline unsigned long btrfs_node_key_ptr_offset(int nr)
{
return offsetof(struct btrfs_node, ptrs) +
sizeof(struct btrfs_key_ptr) * nr;
}
static void btrfs_node_key(struct extent_buffer *eb,
static inline void btrfs_node_key(struct extent_buffer *eb,
struct btrfs_disk_key *disk_key, int nr)
{
unsigned long ptr;