2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/highmem.h>
20 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
21 u##bits btrfs_##name(struct extent_buffer *eb, \
24 unsigned long part_offset = (unsigned long)s; \
25 unsigned long offset = part_offset + offsetof(type, member); \
27 /* ugly, but we want the fast path here */ \
28 if (eb->map_token && offset >= eb->map_start && \
29 offset + sizeof(((type *)0)->member) <= eb->map_start + \
31 p = (type *)(eb->kaddr + part_offset - eb->map_start); \
32 return le##bits##_to_cpu(p->member); \
38 int unmap_on_exit = (eb->map_token == NULL); \
39 unsigned long map_start; \
40 unsigned long map_len; \
42 err = map_extent_buffer(eb, offset, \
43 sizeof(((type *)0)->member), \
45 &map_start, &map_len, KM_USER1); \
47 read_eb_member(eb, s, type, member, &res); \
48 return le##bits##_to_cpu(res); \
50 p = (type *)(kaddr + part_offset - map_start); \
51 res = le##bits##_to_cpu(p->member); \
53 unmap_extent_buffer(eb, map_token, KM_USER1); \
57 void btrfs_set_##name(struct extent_buffer *eb, \
58 type *s, u##bits val) \
60 unsigned long part_offset = (unsigned long)s; \
61 unsigned long offset = part_offset + offsetof(type, member); \
63 /* ugly, but we want the fast path here */ \
64 if (eb->map_token && offset >= eb->map_start && \
65 offset + sizeof(((type *)0)->member) <= eb->map_start + \
67 p = (type *)(eb->kaddr + part_offset - eb->map_start); \
68 p->member = cpu_to_le##bits(val); \
75 int unmap_on_exit = (eb->map_token == NULL); \
76 unsigned long map_start; \
77 unsigned long map_len; \
78 err = map_extent_buffer(eb, offset, \
79 sizeof(((type *)0)->member), \
81 &map_start, &map_len, KM_USER1); \
83 val = cpu_to_le##bits(val); \
84 write_eb_member(eb, s, type, member, &val); \
87 p = (type *)(kaddr + part_offset - map_start); \
88 p->member = cpu_to_le##bits(val); \
90 unmap_extent_buffer(eb, map_token, KM_USER1); \
96 void btrfs_node_key(struct extent_buffer
*eb
,
97 struct btrfs_disk_key
*disk_key
, int nr
)
99 unsigned long ptr
= btrfs_node_key_ptr_offset(nr
);
100 if (eb
->map_token
&& ptr
>= eb
->map_start
&&
101 ptr
+ sizeof(*disk_key
) <= eb
->map_start
+ eb
->map_len
) {
102 memcpy(disk_key
, eb
->kaddr
+ ptr
- eb
->map_start
,
105 } else if (eb
->map_token
) {
106 unmap_extent_buffer(eb
, eb
->map_token
, KM_USER1
);
107 eb
->map_token
= NULL
;
109 read_eb_member(eb
, (struct btrfs_key_ptr
*)ptr
,
110 struct btrfs_key_ptr
, key
, disk_key
);
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