1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#ifndef __DEVICE_UTILS_H__
#define __DEVICE_UTILS_H__
#include "kerncompat.h"
#include <stdbool.h>
#include <unistd.h>
struct btrfs_ioctl_dev_info_args;
struct stat;
/*
* Options for btrfs_prepare_device
*/
enum {
PREP_DEVICE_ZERO_END = (1U << 0),
PREP_DEVICE_DISCARD = (1U << 1),
PREP_DEVICE_VERBOSE = (1U << 2),
PREP_DEVICE_ZONED = (1U << 3),
};
/* Placeholder to denote no results for the zone_unusable sysfs value */
#define DEVICE_ZONE_UNUSABLE_UNKNOWN ((u64)-1)
/*
* Generic block device helpers
*/
int device_discard_blocks(int fd, u64 start, u64 len);
int device_zero_blocks(int fd, off_t start, size_t len, const bool direct);
int device_get_partition_size(const char *dev, u64 *size_ret);
int device_get_partition_size_fd_stat(int fd, const struct stat *st, u64 *size_ret);
int device_get_queue_param(const char *file, const char *param, char *buf, size_t len);
u64 device_get_zone_unusable(int fd, u64 flags);
u64 device_get_zone_size(int fd, const char *name);
int device_get_rotational(const char *file);
int device_get_info(int fd, u64 devid, struct btrfs_ioctl_dev_info_args *di_args);
/*
* Updates to devices with btrfs-specific changs
*/
int btrfs_prepare_device(int fd, const char *file, u64 *block_count_ret,
u64 max_block_count, unsigned opflags);
ssize_t btrfs_direct_pread(int fd, void *buf, size_t count, off_t offset);
ssize_t btrfs_direct_pwrite(int fd, const void *buf, size_t count, off_t offset);
int cmp_device_id(void *priv, struct list_head *a, struct list_head *b);
#ifdef BTRFS_ZONED
static inline ssize_t btrfs_pwrite(int fd, const void *buf, size_t count,
off_t offset, bool direct)
{
if (!direct)
return pwrite(fd, buf, count, offset);
return btrfs_direct_pwrite(fd, buf, count, offset);
}
static inline ssize_t btrfs_pread(int fd, void *buf, size_t count,
off_t offset, bool direct)
{
if (!direct)
return pread(fd, buf, count, offset);
return btrfs_direct_pread(fd, buf, count, offset);
}
#else
#define btrfs_pwrite(fd, buf, count, offset, direct) \
({ (void)(direct); pwrite(fd, buf, count, offset); })
#define btrfs_pread(fd, buf, count, offset, direct) \
({ (void)(direct); pread(fd, buf, count, offset); })
#endif
#endif
|
