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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> |
9b569ea0 | 7 | #include "messages.h" |
18077bb4 | 8 | #include "ctree.h" |
ad1ac501 | 9 | #include "accessors.h" |
18077bb4 | 10 | |
5e394689 DS |
11 | static bool check_setget_bounds(const struct extent_buffer *eb, |
12 | const void *ptr, unsigned off, int size) | |
13 | { | |
14 | const unsigned long member_offset = (unsigned long)ptr + off; | |
15 | ||
234fdd28 | 16 | if (unlikely(member_offset + size > eb->len)) { |
5e394689 | 17 | btrfs_warn(eb->fs_info, |
234fdd28 DS |
18 | "bad eb member %s: ptr 0x%lx start %llu member offset %lu size %d", |
19 | (member_offset > eb->len ? "start" : "end"), | |
5e394689 DS |
20 | (unsigned long)ptr, eb->start, member_offset, size); |
21 | return false; | |
22 | } | |
23 | ||
24 | return true; | |
25 | } | |
26 | ||
ad1ac501 JB |
27 | void btrfs_init_map_token(struct btrfs_map_token *token, struct extent_buffer *eb) |
28 | { | |
29 | token->eb = eb; | |
30 | token->kaddr = page_address(eb->pages[0]); | |
31 | token->offset = 0; | |
32 | } | |
33 | ||
18077bb4 | 34 | /* |
583e4a23 DS |
35 | * Macro templates that define helpers to read/write extent buffer data of a |
36 | * given size, that are also used via ctree.h for access to item members by | |
37 | * specialized helpers. | |
d352ac68 | 38 | * |
583e4a23 DS |
39 | * Generic helpers: |
40 | * - btrfs_set_8 (for 8/16/32/64) | |
41 | * - btrfs_get_8 (for 8/16/32/64) | |
d352ac68 | 42 | * |
583e4a23 DS |
43 | * Generic helpers with a token (cached address of the most recently accessed |
44 | * page): | |
45 | * - btrfs_set_token_8 (for 8/16/32/64) | |
46 | * - btrfs_get_token_8 (for 8/16/32/64) | |
d352ac68 | 47 | * |
583e4a23 DS |
48 | * The set/get functions handle data spanning two pages transparently, in case |
49 | * metadata block size is larger than page. Every pointer to metadata items is | |
50 | * an offset into the extent buffer page array, cast to a specific type. This | |
51 | * gives us all the type checking. | |
cb495113 | 52 | * |
583e4a23 DS |
53 | * The extent buffer pages stored in the array pages do not form a contiguous |
54 | * phyusical range, but the API functions assume the linear offset to the range | |
55 | * from 0 to metadata node size. | |
d352ac68 CM |
56 | */ |
57 | ||
18077bb4 | 58 | #define DEFINE_BTRFS_SETGET_BITS(bits) \ |
cc4c13d5 DS |
59 | u##bits btrfs_get_token_##bits(struct btrfs_map_token *token, \ |
60 | const void *ptr, unsigned long off) \ | |
0f82731f | 61 | { \ |
8f9da810 | 62 | const unsigned long member_offset = (unsigned long)ptr + off; \ |
884b07d0 QW |
63 | const unsigned long idx = get_eb_page_index(member_offset); \ |
64 | const unsigned long oip = get_eb_offset_in_page(token->eb, \ | |
65 | member_offset); \ | |
8f9da810 | 66 | const int size = sizeof(u##bits); \ |
ba8a9a05 DS |
67 | u8 lebytes[sizeof(u##bits)]; \ |
68 | const int part = PAGE_SIZE - oip; \ | |
18077bb4 | 69 | \ |
48bc3950 | 70 | ASSERT(token); \ |
870b388d | 71 | ASSERT(token->kaddr); \ |
5e394689 | 72 | ASSERT(check_setget_bounds(token->eb, ptr, off, size)); \ |
8f9da810 DS |
73 | if (token->offset <= member_offset && \ |
74 | member_offset + size <= token->offset + PAGE_SIZE) { \ | |
75 | return get_unaligned_le##bits(token->kaddr + oip); \ | |
18077bb4 | 76 | } \ |
ba8a9a05 DS |
77 | token->kaddr = page_address(token->eb->pages[idx]); \ |
78 | token->offset = idx << PAGE_SHIFT; \ | |
b3b7e1d0 | 79 | if (INLINE_EXTENT_BUFFER_PAGES == 1 || oip + size <= PAGE_SIZE ) \ |
8f9da810 | 80 | return get_unaligned_le##bits(token->kaddr + oip); \ |
ba8a9a05 DS |
81 | \ |
82 | memcpy(lebytes, token->kaddr + oip, part); \ | |
8f9da810 DS |
83 | token->kaddr = page_address(token->eb->pages[idx + 1]); \ |
84 | token->offset = (idx + 1) << PAGE_SHIFT; \ | |
ba8a9a05 DS |
85 | memcpy(lebytes + part, token->kaddr, size - part); \ |
86 | return get_unaligned_le##bits(lebytes); \ | |
0f82731f | 87 | } \ |
cb495113 DS |
88 | u##bits btrfs_get_##bits(const struct extent_buffer *eb, \ |
89 | const void *ptr, unsigned long off) \ | |
90 | { \ | |
1441ed9b | 91 | const unsigned long member_offset = (unsigned long)ptr + off; \ |
884b07d0 QW |
92 | const unsigned long oip = get_eb_offset_in_page(eb, member_offset); \ |
93 | const unsigned long idx = get_eb_page_index(member_offset); \ | |
84da071f | 94 | char *kaddr = page_address(eb->pages[idx]); \ |
1441ed9b | 95 | const int size = sizeof(u##bits); \ |
84da071f DS |
96 | const int part = PAGE_SIZE - oip; \ |
97 | u8 lebytes[sizeof(u##bits)]; \ | |
cb495113 | 98 | \ |
5e394689 | 99 | ASSERT(check_setget_bounds(eb, ptr, off, size)); \ |
b3b7e1d0 | 100 | if (INLINE_EXTENT_BUFFER_PAGES == 1 || oip + size <= PAGE_SIZE) \ |
1441ed9b | 101 | return get_unaligned_le##bits(kaddr + oip); \ |
84da071f DS |
102 | \ |
103 | memcpy(lebytes, kaddr + oip, part); \ | |
104 | kaddr = page_address(eb->pages[idx + 1]); \ | |
105 | memcpy(lebytes + part, kaddr, size - part); \ | |
106 | return get_unaligned_le##bits(lebytes); \ | |
cb495113 | 107 | } \ |
cc4c13d5 | 108 | void btrfs_set_token_##bits(struct btrfs_map_token *token, \ |
1cbb1f45 | 109 | const void *ptr, unsigned long off, \ |
cc4c13d5 | 110 | u##bits val) \ |
0f82731f | 111 | { \ |
ce7afe87 | 112 | const unsigned long member_offset = (unsigned long)ptr + off; \ |
884b07d0 QW |
113 | const unsigned long idx = get_eb_page_index(member_offset); \ |
114 | const unsigned long oip = get_eb_offset_in_page(token->eb, \ | |
115 | member_offset); \ | |
ce7afe87 | 116 | const int size = sizeof(u##bits); \ |
f472d3c2 DS |
117 | u8 lebytes[sizeof(u##bits)]; \ |
118 | const int part = PAGE_SIZE - oip; \ | |
18077bb4 | 119 | \ |
48bc3950 | 120 | ASSERT(token); \ |
870b388d | 121 | ASSERT(token->kaddr); \ |
5e394689 | 122 | ASSERT(check_setget_bounds(token->eb, ptr, off, size)); \ |
ce7afe87 DS |
123 | if (token->offset <= member_offset && \ |
124 | member_offset + size <= token->offset + PAGE_SIZE) { \ | |
125 | put_unaligned_le##bits(val, token->kaddr + oip); \ | |
18077bb4 LZ |
126 | return; \ |
127 | } \ | |
f472d3c2 DS |
128 | token->kaddr = page_address(token->eb->pages[idx]); \ |
129 | token->offset = idx << PAGE_SHIFT; \ | |
b3b7e1d0 | 130 | if (INLINE_EXTENT_BUFFER_PAGES == 1 || oip + size <= PAGE_SIZE) { \ |
ce7afe87 | 131 | put_unaligned_le##bits(val, token->kaddr + oip); \ |
18077bb4 LZ |
132 | return; \ |
133 | } \ | |
f472d3c2 DS |
134 | put_unaligned_le##bits(val, lebytes); \ |
135 | memcpy(token->kaddr + oip, lebytes, part); \ | |
ce7afe87 DS |
136 | token->kaddr = page_address(token->eb->pages[idx + 1]); \ |
137 | token->offset = (idx + 1) << PAGE_SHIFT; \ | |
f472d3c2 | 138 | memcpy(token->kaddr, lebytes + part, size - part); \ |
cb495113 | 139 | } \ |
2b48966a | 140 | void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr, \ |
cb495113 DS |
141 | unsigned long off, u##bits val) \ |
142 | { \ | |
029e4a42 | 143 | const unsigned long member_offset = (unsigned long)ptr + off; \ |
884b07d0 QW |
144 | const unsigned long oip = get_eb_offset_in_page(eb, member_offset); \ |
145 | const unsigned long idx = get_eb_page_index(member_offset); \ | |
f4ca8c51 | 146 | char *kaddr = page_address(eb->pages[idx]); \ |
029e4a42 | 147 | const int size = sizeof(u##bits); \ |
f4ca8c51 DS |
148 | const int part = PAGE_SIZE - oip; \ |
149 | u8 lebytes[sizeof(u##bits)]; \ | |
cb495113 | 150 | \ |
5e394689 | 151 | ASSERT(check_setget_bounds(eb, ptr, off, size)); \ |
b3b7e1d0 | 152 | if (INLINE_EXTENT_BUFFER_PAGES == 1 || oip + size <= PAGE_SIZE) { \ |
029e4a42 | 153 | put_unaligned_le##bits(val, kaddr + oip); \ |
cb495113 DS |
154 | return; \ |
155 | } \ | |
f4ca8c51 DS |
156 | \ |
157 | put_unaligned_le##bits(val, lebytes); \ | |
158 | memcpy(kaddr + oip, lebytes, part); \ | |
159 | kaddr = page_address(eb->pages[idx + 1]); \ | |
160 | memcpy(kaddr, lebytes + part, size - part); \ | |
18077bb4 | 161 | } |
0f82731f | 162 | |
18077bb4 LZ |
163 | DEFINE_BTRFS_SETGET_BITS(8) |
164 | DEFINE_BTRFS_SETGET_BITS(16) | |
165 | DEFINE_BTRFS_SETGET_BITS(32) | |
166 | DEFINE_BTRFS_SETGET_BITS(64) | |
0f82731f | 167 | |
1cbb1f45 | 168 | void btrfs_node_key(const struct extent_buffer *eb, |
e644d021 CM |
169 | struct btrfs_disk_key *disk_key, int nr) |
170 | { | |
e23efd8e | 171 | unsigned long ptr = btrfs_node_key_ptr_offset(eb, nr); |
e644d021 CM |
172 | read_eb_member(eb, (struct btrfs_key_ptr *)ptr, |
173 | struct btrfs_key_ptr, key, disk_key); | |
174 | } |