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   1 /*-
   2  * Copyright (c) 1989, 1991, 1993
   3  *      The Regents of the University of California.  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  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)mount.h     8.21 (Berkeley) 5/20/95
  30  */
  32 #ifndef _SYS_MOUNT_H_
  33 #define _SYS_MOUNT_H_
  35 #include <sys/cdefs.h>
  36 #include <sys/list.h>
  37 #include <sys/vnode.h>
  38 #include <sys/syslimits.h>
  40 typedef struct { int32_t val[2]; } fsid_t;      /* file system id type */
  43 /*
  44  * file system statistics
  45  */
  46 struct statfs {
  47         short   f_type;                 /* filesystem type number */
  48         short   f_flags;                /* copy of mount flags */
  49         long    f_bsize;                /* fundamental file system block size */
  50         long    f_blocks;               /* total data blocks in file system */
  51         long    f_bfree;                /* free blocks in fs */
  52         long    f_bavail;               /* free blocks avail to non-superuser */
  53         long    f_files;                /* total file nodes in file system */
  54         long    f_ffree;                /* free file nodes in fs */
fsid_t  f_fsid;                 /* file system id */
  56         long    f_namelen;              /* maximum filename length */
  57 };
  59 /*
  60  * Mount data
  61  */
  62 struct mount {
  63         struct list     m_link;         /* link to next mount point */
  64         struct vfsops   *m_op;          /* pointer to vfs operation */
  65         int             m_flags;        /* mount flag */
  66         int             m_count;        /* reference count */
  67         char            m_path[PATH_MAX]; /* mounted path */
dev_t           m_dev;          /* mounted device */
  69         struct vnode    *m_root;        /* root vnode */
  70         struct vnode    *m_covered;     /* vnode covered on parent fs */
  71         void            *m_data;        /* private data for fs */
  72 };
  73 typedef struct mount *mount_t;
  76 /*
  77  * Mount flags.
  78  *
  79  * Unmount uses MNT_FORCE flag.
  80  */
  81 #define MNT_RDONLY      0x00000001      /* read only filesystem */
  82 #define MNT_SYNCHRONOUS 0x00000002      /* file system written synchronously */
  83 #define MNT_NOEXEC      0x00000004      /* can't exec from filesystem */
  84 #define MNT_NOSUID      0x00000008      /* don't honor setuid bits on fs */
  85 #define MNT_NODEV       0x00000010      /* don't interpret special files */
  86 #define MNT_UNION       0x00000020      /* union with underlying filesystem */
  87 #define MNT_ASYNC       0x00000040      /* file system written asynchronously */
  89 /*
  90  * exported mount flags.
  91  */
  92 #define MNT_EXRDONLY    0x00000080      /* exported read only */
  93 #define MNT_EXPORTED    0x00000100      /* file system is exported */
  94 #define MNT_DEFEXPORTED 0x00000200      /* exported to the world */
  95 #define MNT_EXPORTANON  0x00000400      /* use anon uid mapping for everyone */
  96 #define MNT_EXKERB      0x00000800      /* exported with Kerberos uid mapping */
  98 /*
  99  * Flags set by internal operations.
 100  */
 101 #define MNT_LOCAL       0x00001000      /* filesystem is stored locally */
 102 #define MNT_QUOTA       0x00002000      /* quotas are enabled on filesystem */
 103 #define MNT_ROOTFS      0x00004000      /* identifies the root filesystem */
 105 /*
 106  * Mask of flags that are visible to statfs()
 107  */
 108 #define MNT_VISFLAGMASK 0x0000ffff
 110 /*
 111  * Filesystem type switch table.
 112  */
 113 struct vfssw {
 114         char            *vs_name;       /* name of file system */
 115         int             (*vs_init)(void); /* initialize routine */
 116         struct vfsops   *vs_op;         /* pointer to vfs operation */
 117 };
 119 /*
 120  * Operations supported on virtual file system.
 121  */
 122 struct vfsops {
 123         int (*vfs_mount)        (mount_t, char *, int, void *);
 124         int (*vfs_unmount)      (mount_t);
 125         int (*vfs_sync)         (mount_t);
 126         int (*vfs_vget)         (mount_t, vnode_t);
 127         int (*vfs_statfs)       (mount_t, struct statfs *);
 128         struct vnops    *vfs_vnops;
 129 };
 131 typedef int (*vfsop_mount_t)(mount_t, char *, int, void *);
 132 typedef int (*vfsop_umount_t)(mount_t);
 133 typedef int (*vfsop_sync_t)(mount_t);
 134 typedef int (*vfsop_vget_t)(mount_t, vnode_t);
 135 typedef int (*vfsop_statfs_t)(mount_t, struct statfs *);
 137 /*
 138  * VFS interface
 139  */
 140 #define VFS_MOUNT(MP, DEV, FL, DAT) ((MP)->m_op->vfs_mount)(MP, DEV, FL, DAT)
 141 #define VFS_UNMOUNT(MP)             ((MP)->m_op->vfs_unmount)(MP)
 142 #define VFS_SYNC(MP)                ((MP)->m_op->vfs_sync)(MP)
 143 #define VFS_VGET(MP, VP)            ((MP)->m_op->vfs_vget)(MP, VP)
 144 #define VFS_STATFS(MP, SFP)         ((MP)->m_op->vfs_statfs)(MP, SFP)
 146 #define VFS_NULL                    ((void *)vfs_null)
__BEGIN_DECLS
 149 int     mount(const char *, const char *, const char *, int, void *);
 150 int     umount(const char *);
 151 int     vfs_nullop(void);
 152 int     vfs_einval(void);
__END_DECLS
 155 #endif  /* !_SYS_MOUNT_H_ */