mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git
synced 2024-12-04 01:24:20 +08:00
c979ffd787
This syncs accessors.[ch] from the kernel. For the most part accessors.h will remain the same, there's just some helpers that need to be adjusted for eb->data instead of eb->pages. Additionally accessors.c needed to be completely updated to deal with this as well. This is a set of files where we will likely only sync the header going forward, and leave the C file in place as it needs to be specific to btrfs-progs. This forced a few "unrelated" changes - Using btrfs_dir_item_ftype() instead of btrfs_dir_item_type(). This is due to the encryption changes, and was simpler to just do in this patch. - Adjusting some of the print tree code to use the actual helpers and not the btrfs-progs ones. A local definition of static_assert is used to avoid compilation failures on older gcc (< 9) where the 2nd parameter is mandatory. Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: David Sterba <dsterba@suse.com>
118 lines
3.8 KiB
C
118 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
*/
|
|
|
|
#include "kerncompat.h"
|
|
#include "kernel-shared/messages.h"
|
|
#include "kernel-shared/ctree.h"
|
|
#include "kernel-shared/accessors.h"
|
|
|
|
static bool check_setget_bounds(const struct extent_buffer *eb,
|
|
const void *ptr, unsigned off, int size)
|
|
{
|
|
const 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;
|
|
}
|
|
|
|
/*
|
|
* MODIFIED:
|
|
* - We don't have eb->pages.
|
|
*/
|
|
void btrfs_init_map_token(struct btrfs_map_token *token, struct extent_buffer *eb)
|
|
{
|
|
token->eb = eb;
|
|
token->kaddr = eb->data;
|
|
token->offset = 0;
|
|
}
|
|
|
|
/*
|
|
* MODIFIED:
|
|
* - We don't have eb->pages, simply wrap the set/get helpers.
|
|
*/
|
|
|
|
/*
|
|
* 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)
|
|
*
|
|
* 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
|
|
* 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 int size = sizeof(u##bits); \
|
|
ASSERT(token); \
|
|
ASSERT(token->kaddr); \
|
|
ASSERT(check_setget_bounds(token->eb, ptr, off, size)); \
|
|
return get_unaligned_le##bits(token->kaddr + member_offset); \
|
|
} \
|
|
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 int size = sizeof(u##bits); \
|
|
ASSERT(check_setget_bounds(eb, ptr, off, size)); \
|
|
return get_unaligned_le##bits(eb->data + member_offset); \
|
|
} \
|
|
void btrfs_set_token_##bits(struct btrfs_map_token *token, \
|
|
const void *ptr, unsigned long off, \
|
|
u##bits val) \
|
|
{ \
|
|
unsigned long member_offset = (unsigned long)ptr + off; \
|
|
const int size = sizeof(u##bits); \
|
|
ASSERT(token); \
|
|
ASSERT(token->kaddr); \
|
|
ASSERT(check_setget_bounds(token->eb, ptr, off, size)); \
|
|
put_unaligned_le##bits(val, token->kaddr + member_offset); \
|
|
} \
|
|
void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr, \
|
|
unsigned long off, u##bits val) \
|
|
{ \
|
|
unsigned long member_offset = (unsigned long)ptr + off; \
|
|
const int size = sizeof(u##bits); \
|
|
ASSERT(check_setget_bounds(eb, ptr, off, size)); \
|
|
put_unaligned_le##bits(val, (void *)eb->data + member_offset); \
|
|
}
|
|
|
|
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);
|
|
}
|