1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)mount.h 7.22 (Berkeley) 06/03/91 8 */ 9 10 typedef quad fsid_t; /* file system id type */ 11 12 /* 13 * File identifier. 14 * These are unique per filesystem on a single machine. 15 */ 16 #define MAXFIDSZ 16 17 18 struct fid { 19 u_short fid_len; /* length of data in bytes */ 20 u_short fid_reserved; /* force longword alignment */ 21 char fid_data[MAXFIDSZ]; /* data (variable length) */ 22 }; 23 24 /* 25 * file system statistics 26 */ 27 28 #define MNAMELEN 90 /* length of buffer for returned name */ 29 30 struct statfs { 31 short f_type; /* type of filesystem (see below) */ 32 short f_flags; /* copy of mount flags */ 33 long f_fsize; /* fundamental file system block size */ 34 long f_bsize; /* optimal transfer block size */ 35 long f_blocks; /* total data blocks in file system */ 36 long f_bfree; /* free blocks in fs */ 37 long f_bavail; /* free blocks avail to non-superuser */ 38 long f_files; /* total file nodes in file system */ 39 long f_ffree; /* free file nodes in fs */ 40 fsid_t f_fsid; /* file system id */ 41 long f_spare[9]; /* spare for later */ 42 char f_mntonname[MNAMELEN]; /* directory on which mounted */ 43 char f_mntfromname[MNAMELEN];/* mounted filesystem */ 44 }; 45 46 /* 47 * File system types. 48 */ 49 #define MOUNT_NONE 0 50 #define MOUNT_UFS 1 51 #define MOUNT_NFS 2 52 #define MOUNT_MFS 3 53 #define MOUNT_PC 4 54 #define MOUNT_MAXTYPE 4 55 56 /* 57 * Structure per mounted file system. 58 * Each mounted file system has an array of 59 * operations and an instance record. 60 * The file systems are put on a doubly linked list. 61 */ 62 struct mount { 63 struct mount *mnt_next; /* next in mount list */ 64 struct mount *mnt_prev; /* prev in mount list */ 65 struct vfsops *mnt_op; /* operations on fs */ 66 struct vnode *mnt_vnodecovered; /* vnode we mounted on */ 67 struct vnode *mnt_mounth; /* list of vnodes this mount */ 68 int mnt_flag; /* flags */ 69 uid_t mnt_exroot; /* exported mapping for uid 0 */ 70 struct statfs mnt_stat; /* cache of filesystem stats */ 71 qaddr_t mnt_data; /* private data */ 72 }; 73 74 /* 75 * Mount flags. 76 */ 77 #define MNT_RDONLY 0x00000001 /* read only filesystem */ 78 #define MNT_SYNCHRONOUS 0x00000002 /* file system written synchronously */ 79 #define MNT_NOEXEC 0x00000004 /* can't exec from filesystem */ 80 #define MNT_NOSUID 0x00000008 /* don't honor setuid bits on fs */ 81 #define MNT_NODEV 0x00000010 /* don't interpret special files */ 82 83 /* 84 * exported mount flags. 85 */ 86 #define MNT_EXPORTED 0x00000100 /* file system is exported */ 87 #define MNT_EXRDONLY 0x00000200 /* exported read only */ 88 89 /* 90 * Flags set by internal operations. 91 */ 92 #define MNT_LOCAL 0x00001000 /* filesystem is stored locally */ 93 #define MNT_QUOTA 0x00002000 /* quotas are enabled on filesystem */ 94 95 /* 96 * Mask of flags that are visible to statfs() 97 */ 98 #define MNT_VISFLAGMASK 0x0000ffff 99 100 /* 101 * filesystem control flags. 102 * 103 * MNT_MLOCK lock the mount entry so that name lookup cannot proceed 104 * past the mount point. This keeps the subtree stable during mounts 105 * and unmounts. 106 */ 107 #define MNT_UPDATE 0x00010000 /* not a real mount, just an update */ 108 #define MNT_MLOCK 0x00100000 /* lock so that subtree is stable */ 109 #define MNT_MWAIT 0x00200000 /* someone is waiting for lock */ 110 #define MNT_MPBUSY 0x00400000 /* scan of mount point in progress */ 111 #define MNT_MPWANT 0x00800000 /* waiting for mount point */ 112 #define MNT_UNMOUNT 0x01000000 /* unmount in progress */ 113 114 /* 115 * Operations supported on mounted file system. 116 */ 117 #ifdef KERNEL 118 #ifdef __STDC__ 119 struct nameidata; 120 #endif 121 122 struct vfsops { 123 int (*vfs_mount) __P((struct mount *mp, char *path, caddr_t data, 124 struct nameidata *ndp, struct proc *p)); 125 int (*vfs_start) __P((struct mount *mp, int flags, 126 struct proc *p)); 127 int (*vfs_unmount) __P((struct mount *mp, int mntflags, 128 struct proc *p)); 129 int (*vfs_root) __P((struct mount *mp, struct vnode **vpp)); 130 /* int uid, should be uid_t */ 131 int (*vfs_quotactl) __P((struct mount *mp, int cmds, int uid, 132 caddr_t arg, struct proc *p)); 133 int (*vfs_statfs) __P((struct mount *mp, struct statfs *sbp, 134 struct proc *p)); 135 int (*vfs_sync) __P((struct mount *mp, int waitfor)); 136 int (*vfs_fhtovp) __P((struct mount *mp, struct fid *fhp, 137 struct vnode **vpp)); 138 int (*vfs_vptofh) __P((struct vnode *vp, struct fid *fhp)); 139 int (*vfs_init) __P(()); 140 }; 141 142 #define VFS_MOUNT(MP, PATH, DATA, NDP, P) \ 143 (*(MP)->mnt_op->vfs_mount)(MP, PATH, DATA, NDP, P) 144 #define VFS_START(MP, FLAGS, P) (*(MP)->mnt_op->vfs_start)(MP, FLAGS, P) 145 #define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P) 146 #define VFS_ROOT(MP, VPP) (*(MP)->mnt_op->vfs_root)(MP, VPP) 147 #define VFS_QUOTACTL(MP,C,U,A,P) (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P) 148 #define VFS_STATFS(MP, SBP, P) (*(MP)->mnt_op->vfs_statfs)(MP, SBP, P) 149 #define VFS_SYNC(MP, WAITFOR) (*(MP)->mnt_op->vfs_sync)(MP, WAITFOR) 150 #define VFS_FHTOVP(MP, FIDP, VPP) (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP) 151 #define VFS_VPTOFH(VP, FIDP) (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP) 152 #endif /* KERNEL */ 153 154 /* 155 * Flags for various system call interfaces. 156 * 157 * forcibly flags for vfs_umount(). 158 * waitfor flags to vfs_sync() and getfsstat() 159 */ 160 #define MNT_FORCE 1 161 #define MNT_NOFORCE 2 162 #define MNT_WAIT 1 163 #define MNT_NOWAIT 2 164 165 /* 166 * Generic file handle 167 */ 168 struct fhandle { 169 fsid_t fh_fsid; /* File system id of mount point */ 170 struct fid fh_fid; /* Id of file */ 171 }; 172 typedef struct fhandle fhandle_t; 173 174 /* 175 * Arguments to mount UFS 176 */ 177 struct ufs_args { 178 char *fspec; /* block special device to mount */ 179 int exflags; /* export related flags */ 180 uid_t exroot; /* mapping for root uid */ 181 }; 182 183 #ifdef MFS 184 /* 185 * Arguments to mount MFS 186 */ 187 struct mfs_args { 188 char *name; /* name to export for statfs */ 189 caddr_t base; /* base address of file system in memory */ 190 u_long size; /* size of file system */ 191 }; 192 #endif MFS 193 194 #ifdef NFS 195 /* 196 * File Handle (32 bytes for version 2), variable up to 1024 for version 3 197 */ 198 union nfsv2fh { 199 fhandle_t fh_generic; 200 u_char fh_bytes[32]; 201 }; 202 typedef union nfsv2fh nfsv2fh_t; 203 204 /* 205 * Arguments to mount NFS 206 */ 207 struct nfs_args { 208 struct sockaddr *addr; /* file server address */ 209 int sotype; /* Socket type */ 210 int proto; /* and Protocol */ 211 nfsv2fh_t *fh; /* File handle to be mounted */ 212 int flags; /* flags */ 213 int wsize; /* write size in bytes */ 214 int rsize; /* read size in bytes */ 215 int timeo; /* initial timeout in .1 secs */ 216 int retrans; /* times to retry send */ 217 char *hostname; /* server's name */ 218 }; 219 /* 220 * NFS mount option flags 221 */ 222 #define NFSMNT_SOFT 0x0001 /* soft mount (hard is default) */ 223 #define NFSMNT_WSIZE 0x0002 /* set write size */ 224 #define NFSMNT_RSIZE 0x0004 /* set read size */ 225 #define NFSMNT_TIMEO 0x0008 /* set initial timeout */ 226 #define NFSMNT_RETRANS 0x0010 /* set number of request retrys */ 227 #define NFSMNT_HOSTNAME 0x0020 /* set hostname for error printf */ 228 #define NFSMNT_INT 0x0040 /* allow interrupts on hard mount */ 229 #define NFSMNT_NOCONN 0x0080 /* Don't Connect the socket */ 230 #define NFSMNT_SCKLOCK 0x0100 /* Lock socket against others */ 231 #define NFSMNT_WANTSCK 0x0200 /* Want a socket lock */ 232 #define NFSMNT_SPONGY 0x0400 /* spongy mount (soft for stat and lookup) */ 233 #define NFSMNT_COMPRESS 0x0800 /* Compress nfs rpc xdr */ 234 #define NFSMNT_LOCKBITS (NFSMNT_SCKLOCK | NFSMNT_WANTSCK) 235 #endif NFS 236 237 #ifdef KERNEL 238 /* 239 * exported vnode operations 240 */ 241 void vfs_remove __P((struct mount *mp)); /* remove a vfs from mount list */ 242 int vfs_lock __P((struct mount *mp)); /* lock a vfs */ 243 void vfs_unlock __P((struct mount *mp)); /* unlock a vfs */ 244 struct mount *getvfs __P((fsid_t *fsid)); /* return vfs given fsid */ 245 struct mount *rootfs; /* ptr to root mount structure */ 246 struct vfsops *vfssw[]; /* mount filesystem type table */ 247 248 #else /* KERNEL */ 249 250 #include <sys/cdefs.h> 251 252 __BEGIN_DECLS 253 int fstatfs __P((int, struct statfs *)); 254 int getfh __P((const char *, fhandle_t *)); 255 int getfsstat __P((struct statfs *, long, int)); 256 int getmntinfo __P((struct statfs **, int)); 257 int mount __P((int, const char *, int, void *)); 258 int statfs __P((const char *, struct statfs *)); 259 int unmount __P((const char *, int)); 260 __END_DECLS 261 262 #endif /* KERNEL */ 263