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