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