Commit | Line | Data |
---|---|---|
0f82731f CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
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. | |
7 | * | |
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. | |
12 | * | |
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. | |
17 | */ | |
18 | ||
19 | #include <linux/highmem.h> | |
20 | #define BTRFS_SETGET_FUNCS(name, type, member, bits) \ | |
21 | u##bits btrfs_##name(struct extent_buffer *eb, \ | |
22 | type *s) \ | |
23 | { \ | |
df68b8a7 DM |
24 | unsigned long part_offset = (unsigned long)s; \ |
25 | unsigned long offset = part_offset + offsetof(type, member); \ | |
26 | type *p; \ | |
0f82731f CM |
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 + \ | |
30 | eb->map_len) { \ | |
df68b8a7 DM |
31 | p = (type *)(eb->kaddr + part_offset - eb->map_start); \ |
32 | return le##bits##_to_cpu(p->member); \ | |
0f82731f CM |
33 | } \ |
34 | { \ | |
35 | int err; \ | |
36 | char *map_token; \ | |
37 | char *kaddr; \ | |
38 | int unmap_on_exit = (eb->map_token == NULL); \ | |
39 | unsigned long map_start; \ | |
40 | unsigned long map_len; \ | |
41 | __le##bits res; \ | |
42 | err = map_extent_buffer(eb, offset, \ | |
43 | sizeof(((type *)0)->member), \ | |
44 | &map_token, &kaddr, \ | |
45 | &map_start, &map_len, KM_USER1); \ | |
46 | if (err) { \ | |
47 | read_eb_member(eb, s, type, member, &res); \ | |
48 | return le##bits##_to_cpu(res); \ | |
49 | } \ | |
df68b8a7 DM |
50 | p = (type *)(kaddr + part_offset - map_start); \ |
51 | res = le##bits##_to_cpu(p->member); \ | |
0f82731f CM |
52 | if (unmap_on_exit) \ |
53 | unmap_extent_buffer(eb, map_token, KM_USER1); \ | |
54 | return res; \ | |
55 | } \ | |
56 | } \ | |
57 | void btrfs_set_##name(struct extent_buffer *eb, \ | |
58 | type *s, u##bits val) \ | |
59 | { \ | |
df68b8a7 DM |
60 | unsigned long part_offset = (unsigned long)s; \ |
61 | unsigned long offset = part_offset + offsetof(type, member); \ | |
62 | type *p; \ | |
0f82731f CM |
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 + \ | |
66 | eb->map_len) { \ | |
df68b8a7 DM |
67 | p = (type *)(eb->kaddr + part_offset - eb->map_start); \ |
68 | p->member = cpu_to_le##bits(val); \ | |
0f82731f CM |
69 | return; \ |
70 | } \ | |
71 | { \ | |
72 | int err; \ | |
73 | char *map_token; \ | |
74 | char *kaddr; \ | |
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), \ | |
80 | &map_token, &kaddr, \ | |
81 | &map_start, &map_len, KM_USER1); \ | |
82 | if (err) { \ | |
83 | val = cpu_to_le##bits(val); \ | |
84 | write_eb_member(eb, s, type, member, &val); \ | |
85 | return; \ | |
86 | } \ | |
df68b8a7 DM |
87 | p = (type *)(kaddr + part_offset - map_start); \ |
88 | p->member = cpu_to_le##bits(val); \ | |
0f82731f CM |
89 | if (unmap_on_exit) \ |
90 | unmap_extent_buffer(eb, map_token, KM_USER1); \ | |
91 | } \ | |
92 | } | |
93 | ||
94 | #include "ctree.h" | |
95 | ||
e644d021 CM |
96 | void btrfs_node_key(struct extent_buffer *eb, |
97 | struct btrfs_disk_key *disk_key, int nr) | |
98 | { | |
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, | |
103 | sizeof(*disk_key)); | |
104 | return; | |
105 | } else if (eb->map_token) { | |
106 | unmap_extent_buffer(eb, eb->map_token, KM_USER1); | |
107 | eb->map_token = NULL; | |
108 | } | |
109 | read_eb_member(eb, (struct btrfs_key_ptr *)ptr, | |
110 | struct btrfs_key_ptr, key, disk_key); | |
111 | } |