1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_STATFS_H
3#define _LINUX_STATFS_H
4
5#include <linux/types.h>
6#include <asm/statfs.h>
7#include <asm/byteorder.h>
8
9struct kstatfs {
10 long f_type;
11 long f_bsize;
12 u64 f_blocks;
13 u64 f_bfree;
14 u64 f_bavail;
15 u64 f_files;
16 u64 f_ffree;
17 __kernel_fsid_t f_fsid;
18 long f_namelen;
19 long f_frsize;
20 long f_flags;
21 long f_spare[4];
22};
23
24/*
25 * Definitions for the flag in f_flag.
26 *
27 * Generally these flags are equivalent to the MS_ flags used in the mount
28 * ABI. The exception is ST_VALID which has the same value as MS_REMOUNT
29 * which doesn't make any sense for statfs.
30 */
31#define ST_RDONLY 0x0001 /* mount read-only */
32#define ST_NOSUID 0x0002 /* ignore suid and sgid bits */
33#define ST_NODEV 0x0004 /* disallow access to device special files */
34#define ST_NOEXEC 0x0008 /* disallow program execution */
35#define ST_SYNCHRONOUS 0x0010 /* writes are synced at once */
36#define ST_VALID 0x0020 /* f_flags support is implemented */
37#define ST_MANDLOCK 0x0040 /* allow mandatory locks on an FS */
38/* 0x0080 used for ST_WRITE in glibc */
39/* 0x0100 used for ST_APPEND in glibc */
40/* 0x0200 used for ST_IMMUTABLE in glibc */
41#define ST_NOATIME 0x0400 /* do not update access times */
42#define ST_NODIRATIME 0x0800 /* do not update directory access times */
43#define ST_RELATIME 0x1000 /* update atime relative to mtime/ctime */
44#define ST_NOSYMFOLLOW 0x2000 /* do not follow symlinks */
45
46struct dentry;
47extern int vfs_get_fsid(struct dentry *dentry, __kernel_fsid_t *fsid);
48
49static inline __kernel_fsid_t u64_to_fsid(u64 v)
50{
51 return (__kernel_fsid_t){.val = {(u32)v, (u32)(v>>32)}};
52}
53
54/* Fold 16 bytes uuid to 64 bit fsid */
55static inline __kernel_fsid_t uuid_to_fsid(__u8 *uuid)
56{
57 return u64_to_fsid(le64_to_cpup(p: (void *)uuid) ^
58 le64_to_cpup(p: (void *)(uuid + sizeof(u64))));
59}
60
61#endif
62