include/sys/mount.h

   1 /* Header file for mounting/unmount Linux filesystems.
   2    Copyright (C) 1996-2000, 2004, 2010, 2012 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 /* This is taken from /usr/include/linux/fs.h.  */
  20
  21 #ifndef _SYS_MOUNT_H
  22 #define _SYS_MOUNT_H    1
  23
  24 #include <features.h>
  25 #include <sys/ioctl.h>
  26
  27 #define BLOCK_SIZE      1024
  28 #define BLOCK_SIZE_BITS 10
  29
  30
  31 /* These are the fs-independent mount-flags: up to 16 flags are
  32    supported  */
  33 enum
  34 {
  35   MS_RDONLY = 1,                /* Mount read-only.  */
  36 #define MS_RDONLY       MS_RDONLY
  37   MS_NOSUID = 2,                /* Ignore suid and sgid bits.  */
  38 #define MS_NOSUID       MS_NOSUID
  39   MS_NODEV = 4,                 /* Disallow access to device special files.  */
  40 #define MS_NODEV        MS_NODEV
  41   MS_NOEXEC = 8,                /* Disallow program execution.  */
  42 #define MS_NOEXEC       MS_NOEXEC
  43   MS_SYNCHRONOUS = 16,          /* Writes are synced at once.  */
  44 #define MS_SYNCHRONOUS  MS_SYNCHRONOUS
  45   MS_REMOUNT = 32,              /* Alter flags of a mounted FS.  */
  46 #define MS_REMOUNT      MS_REMOUNT
  47   MS_MANDLOCK = 64,             /* Allow mandatory locks on an FS.  */
  48 #define MS_MANDLOCK     MS_MANDLOCK
  49   MS_DIRSYNC = 128,             /* Directory modifications are synchronous.  */
  50 #define MS_DIRSYNC      MS_DIRSYNC
  51   MS_NOATIME = 1024,            /* Do not update access times.  */
  52 #define MS_NOATIME      MS_NOATIME
  53   MS_NODIRATIME = 2048,         /* Do not update directory access times.  */
  54 #define MS_NODIRATIME   MS_NODIRATIME
  55   MS_BIND = 4096,               /* Bind directory at different place.  */
  56 #define MS_BIND         MS_BIND
  57   MS_MOVE = 8192,
  58 #define MS_MOVE         MS_MOVE
  59   MS_REC = 16384,
  60 #define MS_REC          MS_REC
  61   MS_SILENT = 32768,
  62 #define MS_SILENT       MS_SILENT
  63   MS_POSIXACL = 1 << 16,        /* VFS does not apply the umask.  */
  64 #define MS_POSIXACL     MS_POSIXACL
  65   MS_UNBINDABLE = 1 << 17,      /* Change to unbindable.  */
  66 #define MS_UNBINDABLE   MS_UNBINDABLE
  67   MS_PRIVATE = 1 << 18,         /* Change to private.  */
  68 #define MS_PRIVATE      MS_PRIVATE
  69   MS_SLAVE = 1 << 19,           /* Change to slave.  */
  70 #define MS_SLAVE        MS_SLAVE
  71   MS_SHARED = 1 << 20,          /* Change to shared.  */
  72 #define MS_SHARED       MS_SHARED
  73   MS_RELATIME = 1 << 21,        /* Update atime relative to mtime/ctime.  */
  74 #define MS_RELATIME     MS_RELATIME
  75   MS_KERNMOUNT = 1 << 22,       /* This is a kern_mount call.  */
  76 #define MS_KERNMOUNT    MS_KERNMOUNT
  77   MS_I_VERSION =  1 << 23,      /* Update inode I_version field.  */
  78 #define MS_I_VERSION    MS_I_VERSION
  79   MS_STRICTATIME = 1 << 24,     /* Always perform atime updates.  */
  80 #define MS_STRICTATIME  MS_STRICTATIME
  81   MS_ACTIVE = 1 << 30,
  82 #define MS_ACTIVE       MS_ACTIVE
  83   MS_NOUSER = 1 << 31
  84 #define MS_NOUSER       MS_NOUSER
  85 };
  86
  87 /* Flags that can be altered by MS_REMOUNT  */
  88 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
  89
  90
  91 /* Magic mount flag number. Has to be or-ed to the flag values.  */
  92
  93 #define MS_MGC_VAL 0xc0ed0000   /* Magic flag number to indicate "new" flags */
  94 #define MS_MGC_MSK 0xffff0000   /* Magic flag number mask */
  95
  96
  97 /* The read-only stuff doesn't really belong here, but any other place
  98    is probably as bad and I don't want to create yet another include
  99    file.  */
 100
 101 #define BLKROSET   _IO(0x12, 93) /* Set device read-only (0 = read-write).  */
 102 #define BLKROGET   _IO(0x12, 94) /* Get read-only status (0 = read_write).  */
 103 #define BLKRRPART  _IO(0x12, 95) /* Re-read partition table.  */
 104 #define BLKGETSIZE _IO(0x12, 96) /* Return device size.  */
 105 #define BLKFLSBUF  _IO(0x12, 97) /* Flush buffer cache.  */
 106 #define BLKRASET   _IO(0x12, 98) /* Set read ahead for block device.  */
 107 #define BLKRAGET   _IO(0x12, 99) /* Get current read ahead setting.  */
 108 #define BLKFRASET  _IO(0x12,100) /* Set filesystem read-ahead.  */
 109 #define BLKFRAGET  _IO(0x12,101) /* Get filesystem read-ahead.  */
 110 #define BLKSECTSET _IO(0x12,102) /* Set max sectors per request.  */
 111 #define BLKSECTGET _IO(0x12,103) /* Get max sectors per request.  */
 112 #define BLKSSZGET  _IO(0x12,104) /* Get block device sector size.  */
 113 #define BLKBSZGET  _IOR(0x12,112,size_t)
 114 #define BLKBSZSET  _IOW(0x12,113,size_t)
 115 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size.  */
 116
 117
 118 /* Possible value for FLAGS parameter of `umount2'.  */
 119 enum
 120 {
 121   MNT_FORCE = 1,                /* Force unmounting.  */
 122 #define MNT_FORCE MNT_FORCE
 123   MNT_DETACH = 2,               /* Just detach from the tree.  */
 124 #define MNT_DETACH MNT_DETACH
 125   MNT_EXPIRE = 4,               /* Mark for expiry.  */
 126 #define MNT_EXPIRE MNT_EXPIRE
 127   UMOUNT_NOFOLLOW = 8           /* Don't follow symlink on umount.  */
 128 #define UMOUNT_NOFOLLOW UMOUNT_NOFOLLOW
 129 };
 130
 131
 132 __BEGIN_DECLS
 133
 134 /* Mount a filesystem.  */
 135 extern int mount (const char *__special_file, const char *__dir,
 136                   const char *__fstype, unsigned long int __rwflag,
 137                   const void *__data) __THROW;
 138
 139 /* Unmount a filesystem.  */
 140 extern int umount (const char *__special_file) __THROW;
 141
 142 #ifdef __UCLIBC_LINUX_SPECIFIC__
 143 /* Unmount a filesystem.  Force unmounting if FLAGS is set to MNT_FORCE.  */
 144 extern int umount2 (const char *__special_file, int __flags) __THROW;
 145 libc_hidden_proto(umount2)
 146 #endif
 147
 148 __END_DECLS
 149
 150 #endif /* _SYS_MOUNT_H */