^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2007 Oracle. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include "ctree.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) static bool check_setget_bounds(const struct extent_buffer *eb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) const void *ptr, unsigned off, int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) const unsigned long member_offset = (unsigned long)ptr + off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) if (member_offset > eb->len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) btrfs_warn(eb->fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) "bad eb member start: ptr 0x%lx start %llu member offset %lu size %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) (unsigned long)ptr, eb->start, member_offset, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) if (member_offset + size > eb->len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) btrfs_warn(eb->fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) "bad eb member end: ptr 0x%lx start %llu member offset %lu size %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) (unsigned long)ptr, eb->start, member_offset, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * Macro templates that define helpers to read/write extent buffer data of a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * given size, that are also used via ctree.h for access to item members by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * specialized helpers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * Generic helpers:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * - btrfs_set_8 (for 8/16/32/64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * - btrfs_get_8 (for 8/16/32/64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * Generic helpers with a token (cached address of the most recently accessed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * page):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * - btrfs_set_token_8 (for 8/16/32/64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * - btrfs_get_token_8 (for 8/16/32/64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * The set/get functions handle data spanning two pages transparently, in case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * metadata block size is larger than page. Every pointer to metadata items is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * an offset into the extent buffer page array, cast to a specific type. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * gives us all the type checking.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * The extent buffer pages stored in the array pages do not form a contiguous
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * phyusical range, but the API functions assume the linear offset to the range
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * from 0 to metadata node size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #define DEFINE_BTRFS_SETGET_BITS(bits) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) u##bits btrfs_get_token_##bits(struct btrfs_map_token *token, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) const void *ptr, unsigned long off) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) const unsigned long member_offset = (unsigned long)ptr + off; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) const unsigned long idx = member_offset >> PAGE_SHIFT; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) const unsigned long oip = offset_in_page(member_offset); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) const int size = sizeof(u##bits); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) u8 lebytes[sizeof(u##bits)]; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) const int part = PAGE_SIZE - oip; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) ASSERT(token); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) ASSERT(token->kaddr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) ASSERT(check_setget_bounds(token->eb, ptr, off, size)); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (token->offset <= member_offset && \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) member_offset + size <= token->offset + PAGE_SIZE) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return get_unaligned_le##bits(token->kaddr + oip); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) token->kaddr = page_address(token->eb->pages[idx]); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) token->offset = idx << PAGE_SHIFT; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (oip + size <= PAGE_SIZE) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) return get_unaligned_le##bits(token->kaddr + oip); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) memcpy(lebytes, token->kaddr + oip, part); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) token->kaddr = page_address(token->eb->pages[idx + 1]); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) token->offset = (idx + 1) << PAGE_SHIFT; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) memcpy(lebytes + part, token->kaddr, size - part); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return get_unaligned_le##bits(lebytes); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) u##bits btrfs_get_##bits(const struct extent_buffer *eb, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) const void *ptr, unsigned long off) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) const unsigned long member_offset = (unsigned long)ptr + off; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) const unsigned long oip = offset_in_page(member_offset); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) const unsigned long idx = member_offset >> PAGE_SHIFT; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) char *kaddr = page_address(eb->pages[idx]); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) const int size = sizeof(u##bits); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) const int part = PAGE_SIZE - oip; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) u8 lebytes[sizeof(u##bits)]; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) ASSERT(check_setget_bounds(eb, ptr, off, size)); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (oip + size <= PAGE_SIZE) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return get_unaligned_le##bits(kaddr + oip); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) memcpy(lebytes, kaddr + oip, part); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) kaddr = page_address(eb->pages[idx + 1]); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) memcpy(lebytes + part, kaddr, size - part); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return get_unaligned_le##bits(lebytes); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) void btrfs_set_token_##bits(struct btrfs_map_token *token, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) const void *ptr, unsigned long off, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) u##bits val) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) const unsigned long member_offset = (unsigned long)ptr + off; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) const unsigned long idx = member_offset >> PAGE_SHIFT; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) const unsigned long oip = offset_in_page(member_offset); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) const int size = sizeof(u##bits); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) u8 lebytes[sizeof(u##bits)]; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) const int part = PAGE_SIZE - oip; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) ASSERT(token); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) ASSERT(token->kaddr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) ASSERT(check_setget_bounds(token->eb, ptr, off, size)); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (token->offset <= member_offset && \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) member_offset + size <= token->offset + PAGE_SIZE) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) put_unaligned_le##bits(val, token->kaddr + oip); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) token->kaddr = page_address(token->eb->pages[idx]); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) token->offset = idx << PAGE_SHIFT; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (oip + size <= PAGE_SIZE) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) put_unaligned_le##bits(val, token->kaddr + oip); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) put_unaligned_le##bits(val, lebytes); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) memcpy(token->kaddr + oip, lebytes, part); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) token->kaddr = page_address(token->eb->pages[idx + 1]); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) token->offset = (idx + 1) << PAGE_SHIFT; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) memcpy(token->kaddr, lebytes + part, size - part); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) unsigned long off, u##bits val) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) const unsigned long member_offset = (unsigned long)ptr + off; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) const unsigned long oip = offset_in_page(member_offset); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) const unsigned long idx = member_offset >> PAGE_SHIFT; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) char *kaddr = page_address(eb->pages[idx]); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) const int size = sizeof(u##bits); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) const int part = PAGE_SIZE - oip; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) u8 lebytes[sizeof(u##bits)]; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) ASSERT(check_setget_bounds(eb, ptr, off, size)); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (oip + size <= PAGE_SIZE) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) put_unaligned_le##bits(val, kaddr + oip); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) put_unaligned_le##bits(val, lebytes); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) memcpy(kaddr + oip, lebytes, part); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) kaddr = page_address(eb->pages[idx + 1]); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) memcpy(kaddr, lebytes + part, size - part); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) DEFINE_BTRFS_SETGET_BITS(8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) DEFINE_BTRFS_SETGET_BITS(16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) DEFINE_BTRFS_SETGET_BITS(32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) DEFINE_BTRFS_SETGET_BITS(64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) void btrfs_node_key(const struct extent_buffer *eb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) struct btrfs_disk_key *disk_key, int nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) unsigned long ptr = btrfs_node_key_ptr_offset(nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) struct btrfs_key_ptr, key, disk_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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