xref: /linux/include/linux/statfs.h (revision 8be98d2f2a0a262f8bf8a0bc1fdf522b3c7aab17)
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 
9 struct 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 
46 struct dentry;
47 extern int vfs_get_fsid(struct dentry *dentry, __kernel_fsid_t *fsid);
48 
u64_to_fsid(u64 v)49 static 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 */
uuid_to_fsid(__u8 * uuid)55 static inline __kernel_fsid_t uuid_to_fsid(__u8 *uuid)
56 {
57 	return u64_to_fsid(le64_to_cpup((void *)uuid) ^
58 		le64_to_cpup((void *)(uuid + sizeof(u64))));
59 }
60 
61 #endif
62