include/linux/statfs.h

   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
  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 */
  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