forked from luck/tmp_suning_uos_patched
114 lines
3.7 KiB
C
114 lines
3.7 KiB
C
/*
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License v2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public
|
|
* License along with this program; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
|
|
#include <linux/highmem.h>
|
|
#define BTRFS_SETGET_FUNCS(name, type, member, bits) \
|
|
u##bits btrfs_##name(struct extent_buffer *eb, \
|
|
type *s) \
|
|
{ \
|
|
unsigned long offset = (unsigned long)s + \
|
|
offsetof(type, member); \
|
|
__le##bits *tmp; \
|
|
/* ugly, but we want the fast path here */ \
|
|
if (eb->map_token && offset >= eb->map_start && \
|
|
offset + sizeof(((type *)0)->member) <= eb->map_start + \
|
|
eb->map_len) { \
|
|
tmp = (__le##bits *)(eb->kaddr + offset - \
|
|
eb->map_start); \
|
|
return le##bits##_to_cpu(*tmp); \
|
|
} \
|
|
{ \
|
|
int err; \
|
|
char *map_token; \
|
|
char *kaddr; \
|
|
int unmap_on_exit = (eb->map_token == NULL); \
|
|
unsigned long map_start; \
|
|
unsigned long map_len; \
|
|
__le##bits res; \
|
|
err = map_extent_buffer(eb, offset, \
|
|
sizeof(((type *)0)->member), \
|
|
&map_token, &kaddr, \
|
|
&map_start, &map_len, KM_USER1); \
|
|
if (err) { \
|
|
read_eb_member(eb, s, type, member, &res); \
|
|
return le##bits##_to_cpu(res); \
|
|
} \
|
|
tmp = (__le##bits *)(kaddr + offset - map_start); \
|
|
res = le##bits##_to_cpu(*tmp); \
|
|
if (unmap_on_exit) \
|
|
unmap_extent_buffer(eb, map_token, KM_USER1); \
|
|
return res; \
|
|
} \
|
|
} \
|
|
void btrfs_set_##name(struct extent_buffer *eb, \
|
|
type *s, u##bits val) \
|
|
{ \
|
|
unsigned long offset = (unsigned long)s + \
|
|
offsetof(type, member); \
|
|
__le##bits *tmp; \
|
|
/* ugly, but we want the fast path here */ \
|
|
if (eb->map_token && offset >= eb->map_start && \
|
|
offset + sizeof(((type *)0)->member) <= eb->map_start + \
|
|
eb->map_len) { \
|
|
tmp = (__le##bits *)(eb->kaddr + offset - \
|
|
eb->map_start); \
|
|
*tmp = cpu_to_le##bits(val); \
|
|
return; \
|
|
} \
|
|
{ \
|
|
int err; \
|
|
char *map_token; \
|
|
char *kaddr; \
|
|
int unmap_on_exit = (eb->map_token == NULL); \
|
|
unsigned long map_start; \
|
|
unsigned long map_len; \
|
|
err = map_extent_buffer(eb, offset, \
|
|
sizeof(((type *)0)->member), \
|
|
&map_token, &kaddr, \
|
|
&map_start, &map_len, KM_USER1); \
|
|
if (err) { \
|
|
val = cpu_to_le##bits(val); \
|
|
write_eb_member(eb, s, type, member, &val); \
|
|
return; \
|
|
} \
|
|
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); \
|
|
} \
|
|
}
|
|
|
|
#include "ctree.h"
|
|
|
|
void btrfs_node_key(struct extent_buffer *eb,
|
|
struct btrfs_disk_key *disk_key, int nr)
|
|
{
|
|
unsigned long ptr = btrfs_node_key_ptr_offset(nr);
|
|
if (eb->map_token && ptr >= eb->map_start &&
|
|
ptr + sizeof(*disk_key) <= eb->map_start + eb->map_len) {
|
|
memcpy(disk_key, eb->kaddr + ptr - eb->map_start,
|
|
sizeof(*disk_key));
|
|
return;
|
|
} else if (eb->map_token) {
|
|
unmap_extent_buffer(eb, eb->map_token, KM_USER1);
|
|
eb->map_token = NULL;
|
|
}
|
|
read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
|
|
struct btrfs_key_ptr, key, disk_key);
|
|
}
|