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c1d7c514 | 1 | // SPDX-License-Identifier: GPL-2.0 |
0f82731f CM |
2 | /* |
3 | * Copyright (C) 2007 Oracle. All rights reserved. | |
0f82731f CM |
4 | */ |
5 | ||
18077bb4 | 6 | #include <asm/unaligned.h> |
d352ac68 | 7 | |
18077bb4 LZ |
8 | #include "ctree.h" |
9 | ||
10 | static inline u8 get_unaligned_le8(const void *p) | |
11 | { | |
12 | return *(u8 *)p; | |
13 | } | |
14 | ||
15 | static inline void put_unaligned_le8(u8 val, void *p) | |
16 | { | |
17 | *(u8 *)p = val; | |
18 | } | |
19 | ||
5e394689 DS |
20 | static bool check_setget_bounds(const struct extent_buffer *eb, |
21 | const void *ptr, unsigned off, int size) | |
22 | { | |
23 | const unsigned long member_offset = (unsigned long)ptr + off; | |
24 | ||
25 | if (member_offset > eb->len) { | |
26 | btrfs_warn(eb->fs_info, | |
27 | "bad eb member start: ptr 0x%lx start %llu member offset %lu size %d", | |
28 | (unsigned long)ptr, eb->start, member_offset, size); | |
29 | return false; | |
30 | } | |
31 | if (member_offset + size > eb->len) { | |
32 | btrfs_warn(eb->fs_info, | |
33 | "bad eb member end: ptr 0x%lx start %llu member offset %lu size %d", | |
34 | (unsigned long)ptr, eb->start, member_offset, size); | |
35 | return false; | |
36 | } | |
37 | ||
38 | return true; | |
39 | } | |
40 | ||
18077bb4 | 41 | /* |
583e4a23 DS |
42 | * Macro templates that define helpers to read/write extent buffer data of a |
43 | * given size, that are also used via ctree.h for access to item members by | |
44 | * specialized helpers. | |
d352ac68 | 45 | * |
583e4a23 DS |
46 | * Generic helpers: |
47 | * - btrfs_set_8 (for 8/16/32/64) | |
48 | * - btrfs_get_8 (for 8/16/32/64) | |
d352ac68 | 49 | * |
583e4a23 DS |
50 | * Generic helpers with a token (cached address of the most recently accessed |
51 | * page): | |
52 | * - btrfs_set_token_8 (for 8/16/32/64) | |
53 | * - btrfs_get_token_8 (for 8/16/32/64) | |
d352ac68 | 54 | * |
583e4a23 DS |
55 | * The set/get functions handle data spanning two pages transparently, in case |
56 | * metadata block size is larger than page. Every pointer to metadata items is | |
57 | * an offset into the extent buffer page array, cast to a specific type. This | |
58 | * gives us all the type checking. | |
cb495113 | 59 | * |
583e4a23 DS |
60 | * The extent buffer pages stored in the array pages do not form a contiguous |
61 | * phyusical range, but the API functions assume the linear offset to the range | |
62 | * from 0 to metadata node size. | |
d352ac68 CM |
63 | */ |
64 | ||
18077bb4 | 65 | #define DEFINE_BTRFS_SETGET_BITS(bits) \ |
cc4c13d5 DS |
66 | u##bits btrfs_get_token_##bits(struct btrfs_map_token *token, \ |
67 | const void *ptr, unsigned long off) \ | |
0f82731f | 68 | { \ |
8f9da810 DS |
69 | const unsigned long member_offset = (unsigned long)ptr + off; \ |
70 | const unsigned long idx = member_offset >> PAGE_SHIFT; \ | |
71 | const unsigned long oip = offset_in_page(member_offset); \ | |
72 | const int size = sizeof(u##bits); \ | |
ba8a9a05 DS |
73 | u8 lebytes[sizeof(u##bits)]; \ |
74 | const int part = PAGE_SIZE - oip; \ | |
18077bb4 | 75 | \ |
48bc3950 | 76 | ASSERT(token); \ |
870b388d | 77 | ASSERT(token->kaddr); \ |
5e394689 | 78 | ASSERT(check_setget_bounds(token->eb, ptr, off, size)); \ |
8f9da810 DS |
79 | if (token->offset <= member_offset && \ |
80 | member_offset + size <= token->offset + PAGE_SIZE) { \ | |
81 | return get_unaligned_le##bits(token->kaddr + oip); \ | |
18077bb4 | 82 | } \ |
ba8a9a05 DS |
83 | token->kaddr = page_address(token->eb->pages[idx]); \ |
84 | token->offset = idx << PAGE_SHIFT; \ | |
85 | if (oip + size <= PAGE_SIZE) \ | |
8f9da810 | 86 | return get_unaligned_le##bits(token->kaddr + oip); \ |
ba8a9a05 DS |
87 | \ |
88 | memcpy(lebytes, token->kaddr + oip, part); \ | |
8f9da810 DS |
89 | token->kaddr = page_address(token->eb->pages[idx + 1]); \ |
90 | token->offset = (idx + 1) << PAGE_SHIFT; \ | |
ba8a9a05 DS |
91 | memcpy(lebytes + part, token->kaddr, size - part); \ |
92 | return get_unaligned_le##bits(lebytes); \ | |
0f82731f | 93 | } \ |
cb495113 DS |
94 | u##bits btrfs_get_##bits(const struct extent_buffer *eb, \ |
95 | const void *ptr, unsigned long off) \ | |
96 | { \ | |
1441ed9b DS |
97 | const unsigned long member_offset = (unsigned long)ptr + off; \ |
98 | const unsigned long oip = offset_in_page(member_offset); \ | |
84da071f DS |
99 | const unsigned long idx = member_offset >> PAGE_SHIFT; \ |
100 | char *kaddr = page_address(eb->pages[idx]); \ | |
1441ed9b | 101 | const int size = sizeof(u##bits); \ |
84da071f DS |
102 | const int part = PAGE_SIZE - oip; \ |
103 | u8 lebytes[sizeof(u##bits)]; \ | |
cb495113 | 104 | \ |
5e394689 | 105 | ASSERT(check_setget_bounds(eb, ptr, off, size)); \ |
84da071f | 106 | if (oip + size <= PAGE_SIZE) \ |
1441ed9b | 107 | return get_unaligned_le##bits(kaddr + oip); \ |
84da071f DS |
108 | \ |
109 | memcpy(lebytes, kaddr + oip, part); \ | |
110 | kaddr = page_address(eb->pages[idx + 1]); \ | |
111 | memcpy(lebytes + part, kaddr, size - part); \ | |
112 | return get_unaligned_le##bits(lebytes); \ | |
cb495113 | 113 | } \ |
cc4c13d5 | 114 | void btrfs_set_token_##bits(struct btrfs_map_token *token, \ |
1cbb1f45 | 115 | const void *ptr, unsigned long off, \ |
cc4c13d5 | 116 | u##bits val) \ |
0f82731f | 117 | { \ |
ce7afe87 DS |
118 | const unsigned long member_offset = (unsigned long)ptr + off; \ |
119 | const unsigned long idx = member_offset >> PAGE_SHIFT; \ | |
120 | const unsigned long oip = offset_in_page(member_offset); \ | |
121 | const int size = sizeof(u##bits); \ | |
f472d3c2 DS |
122 | u8 lebytes[sizeof(u##bits)]; \ |
123 | const int part = PAGE_SIZE - oip; \ | |
18077bb4 | 124 | \ |
48bc3950 | 125 | ASSERT(token); \ |
870b388d | 126 | ASSERT(token->kaddr); \ |
5e394689 | 127 | ASSERT(check_setget_bounds(token->eb, ptr, off, size)); \ |
ce7afe87 DS |
128 | if (token->offset <= member_offset && \ |
129 | member_offset + size <= token->offset + PAGE_SIZE) { \ | |
130 | put_unaligned_le##bits(val, token->kaddr + oip); \ | |
18077bb4 LZ |
131 | return; \ |
132 | } \ | |
f472d3c2 DS |
133 | token->kaddr = page_address(token->eb->pages[idx]); \ |
134 | token->offset = idx << PAGE_SHIFT; \ | |
ce7afe87 | 135 | if (oip + size <= PAGE_SIZE) { \ |
ce7afe87 | 136 | put_unaligned_le##bits(val, token->kaddr + oip); \ |
18077bb4 LZ |
137 | return; \ |
138 | } \ | |
f472d3c2 DS |
139 | put_unaligned_le##bits(val, lebytes); \ |
140 | memcpy(token->kaddr + oip, lebytes, part); \ | |
ce7afe87 DS |
141 | token->kaddr = page_address(token->eb->pages[idx + 1]); \ |
142 | token->offset = (idx + 1) << PAGE_SHIFT; \ | |
f472d3c2 | 143 | memcpy(token->kaddr, lebytes + part, size - part); \ |
cb495113 | 144 | } \ |
2b48966a | 145 | void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr, \ |
cb495113 DS |
146 | unsigned long off, u##bits val) \ |
147 | { \ | |
029e4a42 DS |
148 | const unsigned long member_offset = (unsigned long)ptr + off; \ |
149 | const unsigned long oip = offset_in_page(member_offset); \ | |
f4ca8c51 DS |
150 | const unsigned long idx = member_offset >> PAGE_SHIFT; \ |
151 | char *kaddr = page_address(eb->pages[idx]); \ | |
029e4a42 | 152 | const int size = sizeof(u##bits); \ |
f4ca8c51 DS |
153 | const int part = PAGE_SIZE - oip; \ |
154 | u8 lebytes[sizeof(u##bits)]; \ | |
cb495113 | 155 | \ |
5e394689 | 156 | ASSERT(check_setget_bounds(eb, ptr, off, size)); \ |
029e4a42 | 157 | if (oip + size <= PAGE_SIZE) { \ |
029e4a42 | 158 | put_unaligned_le##bits(val, kaddr + oip); \ |
cb495113 DS |
159 | return; \ |
160 | } \ | |
f4ca8c51 DS |
161 | \ |
162 | put_unaligned_le##bits(val, lebytes); \ | |
163 | memcpy(kaddr + oip, lebytes, part); \ | |
164 | kaddr = page_address(eb->pages[idx + 1]); \ | |
165 | memcpy(kaddr, lebytes + part, size - part); \ | |
18077bb4 | 166 | } |
0f82731f | 167 | |
18077bb4 LZ |
168 | DEFINE_BTRFS_SETGET_BITS(8) |
169 | DEFINE_BTRFS_SETGET_BITS(16) | |
170 | DEFINE_BTRFS_SETGET_BITS(32) | |
171 | DEFINE_BTRFS_SETGET_BITS(64) | |
0f82731f | 172 | |
1cbb1f45 | 173 | void btrfs_node_key(const struct extent_buffer *eb, |
e644d021 CM |
174 | struct btrfs_disk_key *disk_key, int nr) |
175 | { | |
176 | unsigned long ptr = btrfs_node_key_ptr_offset(nr); | |
e644d021 CM |
177 | read_eb_member(eb, (struct btrfs_key_ptr *)ptr, |
178 | struct btrfs_key_ptr, key, disk_key); | |
179 | } |