LXR linux/include/uapi/linux/mount.h

   1#ifndef _UAPI_LINUX_MOUNT_H
   2#define _UAPI_LINUX_MOUNT_H
   3
   4/*
   5 * These are the fs-independent mount-flags: up to 32 flags are supported
   6 *
   7 * Usage of these is restricted within the kernel to core mount(2) code and
   8 * callers of sys_mount() only.  Filesystems should be using the SB_*
   9 * equivalent instead.
  10 */
  11#define MS_RDONLY        1      /* Mount read-only */
  12#define MS_NOSUID        2      /* Ignore suid and sgid bits */
  13#define MS_NODEV         4      /* Disallow access to device special files */
  14#define MS_NOEXEC        8      /* Disallow program execution */
  15#define MS_SYNCHRONOUS  16      /* Writes are synced at once */
  16#define MS_REMOUNT      32      /* Alter flags of a mounted FS */
  17#define MS_MANDLOCK     64      /* Allow mandatory locks on an FS */
  18#define MS_DIRSYNC      128     /* Directory modifications are synchronous */
  19#define MS_NOATIME      1024    /* Do not update access times. */
  20#define MS_NODIRATIME   2048    /* Do not update directory access times */
  21#define MS_BIND         4096
  22#define MS_MOVE         8192
  23#define MS_REC          16384
  24#define MS_VERBOSE      32768   /* War is peace. Verbosity is silence.
  25                                   MS_VERBOSE is deprecated. */
  26#define MS_SILENT       32768
  27#define MS_POSIXACL     (1<<16) /* VFS does not apply the umask */
  28#define MS_UNBINDABLE   (1<<17) /* change to unbindable */
  29#define MS_PRIVATE      (1<<18) /* change to private */
  30#define MS_SLAVE        (1<<19) /* change to slave */
  31#define MS_SHARED       (1<<20) /* change to shared */
  32#define MS_RELATIME     (1<<21) /* Update atime relative to mtime/ctime. */
  33#define MS_KERNMOUNT    (1<<22) /* this is a kern_mount call */
  34#define MS_I_VERSION    (1<<23) /* Update inode I_version field */
  35#define MS_STRICTATIME  (1<<24) /* Always perform atime updates */
  36#define MS_LAZYTIME     (1<<25) /* Update the on-disk [acm]times lazily */
  37
  38/* These sb flags are internal to the kernel */
  39#define MS_SUBMOUNT     (1<<26)
  40#define MS_NOREMOTELOCK (1<<27)
  41#define MS_NOSEC        (1<<28)
  42#define MS_BORN         (1<<29)
  43#define MS_ACTIVE       (1<<30)
  44#define MS_NOUSER       (1<<31)
  45
  46/*
  47 * Superblock flags that can be altered by MS_REMOUNT
  48 */
  49#define MS_RMT_MASK     (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\
  50                         MS_LAZYTIME)
  51
  52/*
  53 * Old magic mount flag and mask
  54 */
  55#define MS_MGC_VAL 0xC0ED0000
  56#define MS_MGC_MSK 0xffff0000
  57
  58/*
  59 * open_tree() flags.
  60 */
  61#define OPEN_TREE_CLONE         1               /* Clone the target tree and attach the clone */
  62#define OPEN_TREE_CLOEXEC       O_CLOEXEC       /* Close the file on execve() */
  63
  64/*
  65 * move_mount() flags.
  66 */
  67#define MOVE_MOUNT_F_SYMLINKS           0x00000001 /* Follow symlinks on from path */
  68#define MOVE_MOUNT_F_AUTOMOUNTS         0x00000002 /* Follow automounts on from path */
  69#define MOVE_MOUNT_F_EMPTY_PATH         0x00000004 /* Empty from path permitted */
  70#define MOVE_MOUNT_T_SYMLINKS           0x00000010 /* Follow symlinks on to path */
  71#define MOVE_MOUNT_T_AUTOMOUNTS         0x00000020 /* Follow automounts on to path */
  72#define MOVE_MOUNT_T_EMPTY_PATH         0x00000040 /* Empty to path permitted */
  73#define MOVE_MOUNT__MASK                0x00000077
  74
  75/*
  76 * fsopen() flags.
  77 */
  78#define FSOPEN_CLOEXEC          0x00000001
  79
  80/*
  81 * fspick() flags.
  82 */
  83#define FSPICK_CLOEXEC          0x00000001
  84#define FSPICK_SYMLINK_NOFOLLOW 0x00000002
  85#define FSPICK_NO_AUTOMOUNT     0x00000004
  86#define FSPICK_EMPTY_PATH       0x00000008
  87
  88/*
  89 * The type of fsconfig() call made.
  90 */
  91enum fsconfig_command {
  92        FSCONFIG_SET_FLAG       = 0,    /* Set parameter, supplying no value */
  93        FSCONFIG_SET_STRING     = 1,    /* Set parameter, supplying a string value */
  94        FSCONFIG_SET_BINARY     = 2,    /* Set parameter, supplying a binary blob value */
  95        FSCONFIG_SET_PATH       = 3,    /* Set parameter, supplying an object by path */
  96        FSCONFIG_SET_PATH_EMPTY = 4,    /* Set parameter, supplying an object by (empty) path */
  97        FSCONFIG_SET_FD         = 5,    /* Set parameter, supplying an object by fd */
  98        FSCONFIG_CMD_CREATE     = 6,    /* Invoke superblock creation */
  99        FSCONFIG_CMD_RECONFIGURE = 7,   /* Invoke superblock reconfiguration */
 100};
 101
 102/*
 103 * fsmount() flags.
 104 */
 105#define FSMOUNT_CLOEXEC         0x00000001
 106
 107/*
 108 * Mount attributes.
 109 */
 110#define MOUNT_ATTR_RDONLY       0x00000001 /* Mount read-only */
 111#define MOUNT_ATTR_NOSUID       0x00000002 /* Ignore suid and sgid bits */
 112#define MOUNT_ATTR_NODEV        0x00000004 /* Disallow access to device special files */
 113#define MOUNT_ATTR_NOEXEC       0x00000008 /* Disallow program execution */
 114#define MOUNT_ATTR__ATIME       0x00000070 /* Setting on how atime should be updated */
 115#define MOUNT_ATTR_RELATIME     0x00000000 /* - Update atime relative to mtime/ctime. */
 116#define MOUNT_ATTR_NOATIME      0x00000010 /* - Do not update access times. */
 117#define MOUNT_ATTR_STRICTATIME  0x00000020 /* - Always perform atime updates */
 118#define MOUNT_ATTR_NODIRATIME   0x00000080 /* Do not update directory access times */
 119
 120#endif /* _UAPI_LINUX_MOUNT_H */
 121