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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *  * Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  *  * Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in
     12  *    the documentation and/or other materials provided with the
     13  *    distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 #ifndef _SYS_MOUNT_H
     29 #define _SYS_MOUNT_H
     30 
     31 #include <sys/cdefs.h>
     32 #include <sys/ioctl.h>
     33 
     34 __BEGIN_DECLS
     35 
     36 /*
     37  * These are the fs-independent mount-flags: up to 32 flags are supported
     38  */
     39 #define MS_RDONLY        1      /* Mount read-only */
     40 #define MS_NOSUID        2      /* Ignore suid and sgid bits */
     41 #define MS_NODEV         4      /* Disallow access to device special files */
     42 #define MS_NOEXEC        8      /* Disallow program execution */
     43 #define MS_SYNCHRONOUS  16      /* Writes are synced at once */
     44 #define MS_REMOUNT      32      /* Alter flags of a mounted FS */
     45 #define MS_MANDLOCK     64      /* Allow mandatory locks on an FS */
     46 #define MS_DIRSYNC      128     /* Directory modifications are synchronous */
     47 #define MS_NOATIME      1024    /* Do not update access times. */
     48 #define MS_NODIRATIME   2048    /* Do not update directory access times */
     49 #define MS_BIND         4096
     50 #define MS_MOVE         8192
     51 #define MS_REC          16384
     52 #define MS_VERBOSE      32768
     53 #define MS_POSIXACL     (1<<16) /* VFS does not apply the umask */
     54 #define MS_ONE_SECOND   (1<<17) /* fs has 1 sec a/m/ctime resolution */
     55 #define MS_ACTIVE       (1<<30)
     56 #define MS_NOUSER       (1<<31)
     57 
     58 /*
     59  * Superblock flags that can be altered by MS_REMOUNT
     60  */
     61 #define MS_RMT_MASK     (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|MS_NODIRATIME)
     62 
     63 /*
     64  * Old magic mount flag and mask
     65  */
     66 #define MS_MGC_VAL 0xC0ED0000
     67 #define MS_MGC_MSK 0xffff0000
     68 
     69 /*
     70  * umount2() flags
     71  */
     72 #define MNT_FORCE	1	/* Forcibly unmount */
     73 #define MNT_DETACH	2	/* Detach from tree only */
     74 #define MNT_EXPIRE	4	/* Mark for expiry */
     75 
     76 /*
     77  * Block device ioctls
     78  */
     79 #define BLKROSET   _IO(0x12, 93) /* Set device read-only (0 = read-write).  */
     80 #define BLKROGET   _IO(0x12, 94) /* Get read-only status (0 = read_write).  */
     81 #define BLKRRPART  _IO(0x12, 95) /* Re-read partition table.  */
     82 #define BLKGETSIZE _IO(0x12, 96) /* Return device size.  */
     83 #define BLKFLSBUF  _IO(0x12, 97) /* Flush buffer cache.  */
     84 #define BLKRASET   _IO(0x12, 98) /* Set read ahead for block device.  */
     85 #define BLKRAGET   _IO(0x12, 99) /* Get current read ahead setting.  */
     86 
     87 /*
     88  * Prototypes
     89  */
     90 extern int mount(const char *, const char *,
     91 		   const char *, unsigned long,
     92 		   const void *);
     93 extern int umount(const char *);
     94 extern int umount2(const char *, int);
     95 extern int pivot_root(const char *, const char *);
     96 
     97 __END_DECLS
     98 
     99 #endif /* _SYS_MOUNT_H */
    100