mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
72b2b199d5
There used to be 'oip' short for offset in page, which got changed during conversion to folios, the name is a bit confusing so rename it. Signed-off-by: David Sterba <dsterba@suse.com>
125 lines
4.2 KiB
C
125 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
*/
|
|
|
|
#include <linux/unaligned.h>
|
|
#include "messages.h"
|
|
#include "extent_io.h"
|
|
#include "fs.h"
|
|
#include "accessors.h"
|
|
|
|
static void __cold report_setget_bounds(const struct extent_buffer *eb,
|
|
const void *ptr, unsigned off, int size)
|
|
{
|
|
unsigned long member_offset = (unsigned long)ptr + off;
|
|
|
|
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);
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
memcpy(dest, src1, len1);
|
|
memcpy(dest + len1, src2, total - len1);
|
|
}
|
|
|
|
/*
|
|
* Macro templates that define helpers to read/write extent buffer data of a
|
|
* given size, that are also used via ctree.h for access to item members by
|
|
* specialized helpers.
|
|
*
|
|
* Generic helpers:
|
|
* - btrfs_set_8 (for 8/16/32/64)
|
|
* - btrfs_get_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 folios may not form a contiguous
|
|
* phyusical 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_##bits(const struct extent_buffer *eb, \
|
|
const void *ptr, unsigned long off) \
|
|
{ \
|
|
const unsigned long member_offset = (unsigned long)ptr + off; \
|
|
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)]; \
|
|
\
|
|
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); \
|
|
\
|
|
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_##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_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)]; \
|
|
\
|
|
if (unlikely(member_offset + sizeof(u##bits) > eb->len)) { \
|
|
report_setget_bounds(eb, ptr, off, sizeof(u##bits)); \
|
|
return; \
|
|
} \
|
|
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); \
|
|
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); \
|
|
} \
|
|
}
|
|
|
|
DEFINE_BTRFS_SETGET_BITS(8)
|
|
DEFINE_BTRFS_SETGET_BITS(16)
|
|
DEFINE_BTRFS_SETGET_BITS(32)
|
|
DEFINE_BTRFS_SETGET_BITS(64)
|
|
|
|
void btrfs_node_key(const struct extent_buffer *eb,
|
|
struct btrfs_disk_key *disk_key, int nr)
|
|
{
|
|
unsigned long ptr = btrfs_node_key_ptr_offset(eb, nr);
|
|
read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
|
|
struct btrfs_key_ptr, key, disk_key);
|
|
}
|