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btrfs: use helper sizeof_field in struct accessors

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There's a helper for obtaining size of a struct member, we can use it
instead of open coding the pointer magic.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2023-07-13 16:10:26 +02:00
parent 16c3a47648
commit 98efb4eb31
1 changed files with 11 additions and 12 deletions
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23
fs/btrfs/accessors.h
View file

@ -3,6 +3,8 @@
#ifndef BTRFS_ACCESSORS_H
#define BTRFS_ACCESSORS_H
#include <linux/stddef.h>
struct btrfs_map_token {
struct extent_buffer *eb;
char *kaddr;
@ -34,13 +36,13 @@ static inline void put_unaligned_le8(u8 val, void *p)
read_extent_buffer(eb, (char *)(result), \
((unsigned long)(ptr)) + \
offsetof(type, member), \
sizeof(((type *)0)->member)))
sizeof_field(type, member)))
#define write_eb_member(eb, ptr, type, member, result) (\
write_extent_buffer(eb, (char *)(result), \
((unsigned long)(ptr)) + \
offsetof(type, member), \
sizeof(((type *)0)->member)))
sizeof_field(type, member)))
#define DECLARE_BTRFS_SETGET_BITS(bits) \
u##bits btrfs_get_token_##bits(struct btrfs_map_token *token, \
@ -62,25 +64,25 @@ DECLARE_BTRFS_SETGET_BITS(64)
static inline u##bits btrfs_##name(const struct extent_buffer *eb, \
const type *s) \
{ \
static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
static_assert(sizeof(u##bits) == sizeof_field(type, member)); \
return btrfs_get_##bits(eb, s, offsetof(type, member)); \
} \
static inline void btrfs_set_##name(const struct extent_buffer *eb, type *s, \
u##bits val) \
{ \
static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
static_assert(sizeof(u##bits) == sizeof_field(type, member)); \
btrfs_set_##bits(eb, s, offsetof(type, member), val); \
} \
static inline u##bits btrfs_token_##name(struct btrfs_map_token *token, \
const type *s) \
{ \
static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
static_assert(sizeof(u##bits) == sizeof_field(type, member)); \
return btrfs_get_token_##bits(token, s, offsetof(type, member));\
} \
static inline void btrfs_set_token_##name(struct btrfs_map_token *token,\
type *s, u##bits val) \
{ \
static_assert(sizeof(u##bits) == sizeof(((type *)0))->member); \
static_assert(sizeof(u##bits) == sizeof_field(type, member)); \
btrfs_set_token_##bits(token, s, offsetof(type, member), val); \
}
@ -111,17 +113,14 @@ static inline void btrfs_set_##name(type *s, u##bits val) \
static inline u64 btrfs_device_total_bytes(const struct extent_buffer *eb,
struct btrfs_dev_item *s)
{
static_assert(sizeof(u64) ==
sizeof(((struct btrfs_dev_item *)0))->total_bytes);
return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
total_bytes));
static_assert(sizeof(u64) == sizeof_field(struct btrfs_dev_item, total_bytes));
return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes));
}
static inline void btrfs_set_device_total_bytes(const struct extent_buffer *eb,
struct btrfs_dev_item *s,
u64 val)
{
static_assert(sizeof(u64) ==
sizeof(((struct btrfs_dev_item *)0))->total_bytes);
static_assert(sizeof(u64) == sizeof_field(struct btrfs_dev_item, total_bytes));
WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
}