diff options
Diffstat (limited to 'fs/btrfs/accessors.c')
| -rw-r--r-- | fs/btrfs/accessors.c | 167 |
1 files changed, 59 insertions, 108 deletions
diff --git a/fs/btrfs/accessors.c b/fs/btrfs/accessors.c index 206cf1612c1d..1248aa2535d3 100644 --- a/fs/btrfs/accessors.c +++ b/fs/btrfs/accessors.c @@ -3,32 +3,30 @@ * Copyright (C) 2007 Oracle. All rights reserved. */ -#include <asm/unaligned.h> +#include <linux/unaligned.h> #include "messages.h" -#include "ctree.h" +#include "extent_io.h" +#include "fs.h" #include "accessors.h" -static bool check_setget_bounds(const struct extent_buffer *eb, - const void *ptr, unsigned off, int size) +static void __cold report_setget_bounds(const struct extent_buffer *eb, + const void *ptr, unsigned off, int size) { - const unsigned long member_offset = (unsigned long)ptr + off; + unsigned long member_offset = (unsigned long)ptr + off; - if (unlikely(member_offset + size > eb->len)) { - btrfs_warn(eb->fs_info, - "bad eb member %s: ptr 0x%lx start %llu member offset %lu size %d", - (member_offset > eb->len ? "start" : "end"), - (unsigned long)ptr, eb->start, member_offset, size); - return false; - } - - return true; + btrfs_warn(eb->fs_info, + "bad eb member %s: ptr 0x%lx start %llu member offset %lu size %d", + (member_offset > eb->len ? "start" : "end"), + (unsigned long)ptr, eb->start, member_offset, size); } -void btrfs_init_map_token(struct btrfs_map_token *token, struct extent_buffer *eb) +/* Copy bytes from @src1 and @src2 to @dest. */ +static __always_inline void memcpy_split_src(char *dest, const char *src1, + const char *src2, const size_t len1, + const size_t total) { - token->eb = eb; - token->kaddr = page_address(eb->pages[0]); - token->offset = 0; + memcpy(dest, src1, len1); + memcpy(dest + len1, src2, total - len1); } /* @@ -40,124 +38,77 @@ void btrfs_init_map_token(struct btrfs_map_token *token, struct extent_buffer *e * - btrfs_set_8 (for 8/16/32/64) * - btrfs_get_8 (for 8/16/32/64) * - * Generic helpers with a token (cached address of the most recently accessed - * page): - * - btrfs_set_token_8 (for 8/16/32/64) - * - btrfs_get_token_8 (for 8/16/32/64) - * * The set/get functions handle data spanning two pages transparently, in case * metadata block size is larger than page. Every pointer to metadata items is * an offset into the extent buffer page array, cast to a specific type. This * gives us all the type checking. * - * The extent buffer pages stored in the array pages do not form a contiguous - * phyusical range, but the API functions assume the linear offset to the range + * The extent buffer pages stored in the array folios may not form a contiguous + * physical range, but the API functions assume the linear offset to the range * from 0 to metadata node size. */ #define DEFINE_BTRFS_SETGET_BITS(bits) \ -u##bits btrfs_get_token_##bits(struct btrfs_map_token *token, \ - const void *ptr, unsigned long off) \ -{ \ - const unsigned long member_offset = (unsigned long)ptr + off; \ - const unsigned long idx = get_eb_page_index(member_offset); \ - const unsigned long oip = get_eb_offset_in_page(token->eb, \ - member_offset); \ - const int size = sizeof(u##bits); \ - u8 lebytes[sizeof(u##bits)]; \ - const int part = PAGE_SIZE - oip; \ - \ - ASSERT(token); \ - ASSERT(token->kaddr); \ - ASSERT(check_setget_bounds(token->eb, ptr, off, size)); \ - if (token->offset <= member_offset && \ - member_offset + size <= token->offset + PAGE_SIZE) { \ - return get_unaligned_le##bits(token->kaddr + oip); \ - } \ - token->kaddr = page_address(token->eb->pages[idx]); \ - token->offset = idx << PAGE_SHIFT; \ - if (INLINE_EXTENT_BUFFER_PAGES == 1 || oip + size <= PAGE_SIZE ) \ - return get_unaligned_le##bits(token->kaddr + oip); \ - \ - memcpy(lebytes, token->kaddr + oip, part); \ - token->kaddr = page_address(token->eb->pages[idx + 1]); \ - token->offset = (idx + 1) << PAGE_SHIFT; \ - memcpy(lebytes + part, token->kaddr, size - part); \ - return get_unaligned_le##bits(lebytes); \ -} \ u##bits btrfs_get_##bits(const struct extent_buffer *eb, \ const void *ptr, unsigned long off) \ { \ const unsigned long member_offset = (unsigned long)ptr + off; \ - const unsigned long oip = get_eb_offset_in_page(eb, member_offset); \ - const unsigned long idx = get_eb_page_index(member_offset); \ - char *kaddr = page_address(eb->pages[idx]); \ - const int size = sizeof(u##bits); \ - const int part = PAGE_SIZE - oip; \ + const unsigned long idx = get_eb_folio_index(eb, member_offset);\ + const unsigned long oif = get_eb_offset_in_folio(eb, \ + member_offset);\ + char *kaddr = folio_address(eb->folios[idx]) + oif; \ + const int part = eb->folio_size - oif; \ u8 lebytes[sizeof(u##bits)]; \ \ - ASSERT(check_setget_bounds(eb, ptr, off, size)); \ - if (INLINE_EXTENT_BUFFER_PAGES == 1 || oip + size <= PAGE_SIZE) \ - return get_unaligned_le##bits(kaddr + oip); \ + if (unlikely(member_offset + sizeof(u##bits) > eb->len)) { \ + report_setget_bounds(eb, ptr, off, sizeof(u##bits)); \ + return 0; \ + } \ + if (INLINE_EXTENT_BUFFER_PAGES == 1 || sizeof(u##bits) == 1 || \ + likely(sizeof(u##bits) <= part)) \ + return get_unaligned_le##bits(kaddr); \ \ - memcpy(lebytes, kaddr + oip, part); \ - kaddr = page_address(eb->pages[idx + 1]); \ - memcpy(lebytes + part, kaddr, size - part); \ + if (sizeof(u##bits) == 2) { \ + lebytes[0] = *kaddr; \ + kaddr = folio_address(eb->folios[idx + 1]); \ + lebytes[1] = *kaddr; \ + } else { \ + memcpy_split_src(lebytes, kaddr, \ + folio_address(eb->folios[idx + 1]), \ + part, sizeof(u##bits)); \ + } \ return get_unaligned_le##bits(lebytes); \ } \ -void btrfs_set_token_##bits(struct btrfs_map_token *token, \ - const void *ptr, unsigned long off, \ - u##bits val) \ +void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr, \ + unsigned long off, u##bits val) \ { \ const unsigned long member_offset = (unsigned long)ptr + off; \ - const unsigned long idx = get_eb_page_index(member_offset); \ - const unsigned long oip = get_eb_offset_in_page(token->eb, \ - member_offset); \ - const int size = sizeof(u##bits); \ + const unsigned long idx = get_eb_folio_index(eb, member_offset);\ + const unsigned long oif = get_eb_offset_in_folio(eb, \ + member_offset);\ + char *kaddr = folio_address(eb->folios[idx]) + oif; \ + const int part = eb->folio_size - oif; \ u8 lebytes[sizeof(u##bits)]; \ - const int part = PAGE_SIZE - oip; \ \ - ASSERT(token); \ - ASSERT(token->kaddr); \ - ASSERT(check_setget_bounds(token->eb, ptr, off, size)); \ - if (token->offset <= member_offset && \ - member_offset + size <= token->offset + PAGE_SIZE) { \ - put_unaligned_le##bits(val, token->kaddr + oip); \ + if (unlikely(member_offset + sizeof(u##bits) > eb->len)) { \ + report_setget_bounds(eb, ptr, off, sizeof(u##bits)); \ return; \ } \ - token->kaddr = page_address(token->eb->pages[idx]); \ - token->offset = idx << PAGE_SHIFT; \ - if (INLINE_EXTENT_BUFFER_PAGES == 1 || oip + size <= PAGE_SIZE) { \ - put_unaligned_le##bits(val, token->kaddr + oip); \ + if (INLINE_EXTENT_BUFFER_PAGES == 1 || sizeof(u##bits) == 1 || \ + likely(sizeof(u##bits) <= part)) { \ + put_unaligned_le##bits(val, kaddr); \ return; \ } \ put_unaligned_le##bits(val, lebytes); \ - memcpy(token->kaddr + oip, lebytes, part); \ - token->kaddr = page_address(token->eb->pages[idx + 1]); \ - token->offset = (idx + 1) << PAGE_SHIFT; \ - memcpy(token->kaddr, lebytes + part, size - part); \ -} \ -void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr, \ - unsigned long off, u##bits val) \ -{ \ - const unsigned long member_offset = (unsigned long)ptr + off; \ - const unsigned long oip = get_eb_offset_in_page(eb, member_offset); \ - const unsigned long idx = get_eb_page_index(member_offset); \ - char *kaddr = page_address(eb->pages[idx]); \ - const int size = sizeof(u##bits); \ - const int part = PAGE_SIZE - oip; \ - u8 lebytes[sizeof(u##bits)]; \ - \ - ASSERT(check_setget_bounds(eb, ptr, off, size)); \ - if (INLINE_EXTENT_BUFFER_PAGES == 1 || oip + size <= PAGE_SIZE) { \ - put_unaligned_le##bits(val, kaddr + oip); \ - return; \ + if (sizeof(u##bits) == 2) { \ + *kaddr = lebytes[0]; \ + kaddr = folio_address(eb->folios[idx + 1]); \ + *kaddr = lebytes[1]; \ + } else { \ + memcpy(kaddr, lebytes, part); \ + kaddr = folio_address(eb->folios[idx + 1]); \ + memcpy(kaddr, lebytes + part, sizeof(u##bits) - part); \ } \ - \ - put_unaligned_le##bits(val, lebytes); \ - memcpy(kaddr + oip, lebytes, part); \ - kaddr = page_address(eb->pages[idx + 1]); \ - memcpy(kaddr, lebytes + part, size - part); \ } DEFINE_BTRFS_SETGET_BITS(8) |