The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/mount.h

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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. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)mount.h     8.21 (Berkeley) 5/20/95
   34  * $FreeBSD: stable/3/sys/sys/mount.h 53559 1999-11-22 07:08:13Z julian $
   35  */
   36 
   37 #ifndef _SYS_MOUNT_H_
   38 #define _SYS_MOUNT_H_
   39 
   40 #include <sys/ucred.h>
   41 #include <sys/queue.h>
   42 #include <sys/lock.h>
   43 
   44 typedef struct fsid { int32_t val[2]; } fsid_t; /* file system id type */
   45 
   46 /*
   47  * File identifier.
   48  * These are unique per filesystem on a single machine.
   49  */
   50 #define MAXFIDSZ        16
   51 
   52 struct fid {
   53         u_short         fid_len;                /* length of data in bytes */
   54         u_short         fid_reserved;           /* force longword alignment */
   55         char            fid_data[MAXFIDSZ];     /* data (variable length) */
   56 };
   57 
   58 /*
   59  * file system statistics
   60  */
   61 
   62 #define MFSNAMELEN      16      /* length of fs type name, including null */
   63 #define MNAMELEN        90      /* length of buffer for returned name */
   64 
   65 struct statfs {
   66         long    f_spare2;               /* placeholder */
   67         long    f_bsize;                /* fundamental file system block size */
   68         long    f_iosize;               /* optimal transfer block size */
   69         long    f_blocks;               /* total data blocks in file system */
   70         long    f_bfree;                /* free blocks in fs */
   71         long    f_bavail;               /* free blocks avail to non-superuser */
   72         long    f_files;                /* total file nodes in file system */
   73         long    f_ffree;                /* free file nodes in fs */
   74         fsid_t  f_fsid;                 /* file system id */
   75         uid_t   f_owner;                /* user that mounted the filesystem */
   76         int     f_type;                 /* type of filesystem */
   77         int     f_flags;                /* copy of mount exported flags */
   78         long    f_syncwrites;           /* count of sync writes since mount */
   79         long    f_asyncwrites;          /* count of async writes since mount */
   80         char    f_fstypename[MFSNAMELEN]; /* fs type name */
   81         char    f_mntonname[MNAMELEN];  /* directory on which mounted */
   82         char    f_mntfromname[MNAMELEN];/* mounted filesystem */
   83 };
   84 
   85 /*
   86  * Structure per mounted file system.  Each mounted file system has an
   87  * array of operations and an instance record.  The file systems are
   88  * put on a doubly linked list.
   89  */
   90 LIST_HEAD(vnodelst, vnode);
   91 
   92 struct mount {
   93         CIRCLEQ_ENTRY(mount) mnt_list;          /* mount list */
   94         struct vfsops   *mnt_op;                /* operations on fs */
   95         struct vfsconf  *mnt_vfc;               /* configuration info */
   96         struct vnode    *mnt_vnodecovered;      /* vnode we mounted on */
   97         struct vnode    *mnt_syncer;            /* syncer vnode */
   98         struct vnodelst mnt_vnodelist;          /* list of vnodes this mount */
   99         struct lock     mnt_lock;               /* mount structure lock */
  100         int             mnt_flag;               /* flags shared with user */
  101         int             mnt_kern_flag;          /* kernel only flags */
  102         int             mnt_maxsymlinklen;      /* max size of short symlink */
  103         struct statfs   mnt_stat;               /* cache of filesystem stats */
  104         qaddr_t         mnt_data;               /* private data */
  105         time_t          mnt_time;               /* last time written*/
  106 };
  107 
  108 /*
  109  * User specifiable flags.
  110  */
  111 #define MNT_RDONLY      0x00000001      /* read only filesystem */
  112 #define MNT_SYNCHRONOUS 0x00000002      /* file system written synchronously */
  113 #define MNT_NOEXEC      0x00000004      /* can't exec from filesystem */
  114 #define MNT_NOSUID      0x00000008      /* don't honor setuid bits on fs */
  115 #define MNT_NODEV       0x00000010      /* don't interpret special files */
  116 #define MNT_UNION       0x00000020      /* union with underlying filesystem */
  117 #define MNT_ASYNC       0x00000040      /* file system written asynchronously */
  118 #define MNT_SUIDDIR     0x00100000      /* special handling of SUID on dirs */
  119 #define MNT_SOFTDEP     0x00200000      /* soft updates being done */
  120 #define MNT_NOSYMFOLLOW 0x00400000      /* do not follow symlinks */
  121 #define MNT_NOATIME     0x10000000      /* disable update of file access time */
  122 #define MNT_NOCLUSTERR  0x40000000      /* disable cluster read */
  123 #define MNT_NOCLUSTERW  0x80000000      /* disable cluster write */
  124 
  125 /*
  126  * NFS export related mount flags.
  127  */
  128 #define MNT_EXRDONLY    0x00000080      /* exported read only */
  129 #define MNT_EXPORTED    0x00000100      /* file system is exported */
  130 #define MNT_DEFEXPORTED 0x00000200      /* exported to the world */
  131 #define MNT_EXPORTANON  0x00000400      /* use anon uid mapping for everyone */
  132 #define MNT_EXKERB      0x00000800      /* exported with Kerberos uid mapping */
  133 #define MNT_EXPUBLIC    0x20000000      /* public export (WebNFS) */
  134 
  135 /*
  136  * Flags set by internal operations,
  137  * but visible to the user.
  138  * XXX some of these are not quite right.. (I've never seen the root flag set)
  139  */
  140 #define MNT_LOCAL       0x00001000      /* filesystem is stored locally */
  141 #define MNT_QUOTA       0x00002000      /* quotas are enabled on filesystem */
  142 #define MNT_ROOTFS      0x00004000      /* identifies the root filesystem */
  143 #define MNT_USER        0x00008000      /* mounted by a user */
  144 
  145 /*
  146  * Mask of flags that are visible to statfs()
  147  * XXX I think that this could now become (~(MNT_CMDFLAGS))
  148  * but the 'mount' program may need changing to handle this.
  149  * XXX MNT_EXPUBLIC is presently left out. I don't know why.
  150  */
  151 #define MNT_VISFLAGMASK (MNT_RDONLY     | MNT_SYNCHRONOUS | MNT_NOEXEC  | \
  152                         MNT_NOSUID      | MNT_NODEV     | MNT_UNION     | \
  153                         MNT_ASYNC       | MNT_EXRDONLY  | MNT_EXPORTED  | \
  154                         MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB    | \
  155                         MNT_LOCAL       | MNT_USER      | MNT_QUOTA     | \
  156                         MNT_ROOTFS      | MNT_NOATIME   | MNT_NOCLUSTERR| \
  157                         MNT_NOCLUSTERW  | MNT_SUIDDIR   | MNT_SOFTDEP    \
  158                         /*      | MNT_EXPUBLIC */)
  159 /*
  160  * External filesystem command modifier flags.
  161  * Unmount can use the MNT_FORCE flag.
  162  * XXX These are not STATES and really should be somewhere else.
  163  */
  164 #define MNT_UPDATE      0x00010000      /* not a real mount, just an update */
  165 #define MNT_DELEXPORT   0x00020000      /* delete export host lists */
  166 #define MNT_RELOAD      0x00040000      /* reload filesystem data */
  167 #define MNT_FORCE       0x00080000      /* force unmount or readonly change */
  168 #define MNT_CMDFLAGS    (MNT_UPDATE|MNT_DELEXPORT|MNT_RELOAD|MNT_FORCE)
  169 /*
  170  * Internal filesystem control flags stored in mnt_kern_flag.
  171  *
  172  * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
  173  * past the mount point.  This keeps the subtree stable during mounts
  174  * and unmounts.
  175  */
  176 #define MNTK_UNMOUNT    0x01000000      /* unmount in progress */
  177 #define MNTK_MWAIT      0x02000000      /* waiting for unmount to finish */
  178 #define MNTK_WANTRDWR   0x04000000      /* upgrade to read/write requested */
  179 
  180 /*
  181  * Sysctl CTL_VFS definitions.
  182  *
  183  * Second level identifier specifies which filesystem. Second level
  184  * identifier VFS_VFSCONF returns information about all filesystems.
  185  * Second level identifier VFS_GENERIC is non-terminal.
  186  */
  187 #define VFS_VFSCONF             0       /* get configured filesystems */
  188 #define VFS_GENERIC             0       /* generic filesystem information */
  189 /*
  190  * Third level identifiers for VFS_GENERIC are given below; third
  191  * level identifiers for specific filesystems are given in their
  192  * mount specific header files.
  193  */
  194 #define VFS_MAXTYPENUM  1       /* int: highest defined filesystem type */
  195 #define VFS_CONF        2       /* struct: vfsconf for filesystem given
  196                                    as next argument */
  197 
  198 /*
  199  * Flags for various system call interfaces.
  200  *
  201  * waitfor flags to vfs_sync() and getfsstat()
  202  */
  203 #define MNT_WAIT        1       /* synchronously wait for I/O to complete */
  204 #define MNT_NOWAIT      2       /* start all I/O, but do not wait for it */
  205 #define MNT_LAZY        3       /* push data not written by filesystem syncer */
  206 
  207 /*
  208  * Generic file handle
  209  */
  210 struct fhandle {
  211         fsid_t  fh_fsid;        /* File system id of mount point */
  212         struct  fid fh_fid;     /* File sys specific id */
  213 };
  214 typedef struct fhandle  fhandle_t;
  215 
  216 /*
  217  * Export arguments for local filesystem mount calls.
  218  */
  219 struct export_args {
  220         int     ex_flags;               /* export related flags */
  221         uid_t   ex_root;                /* mapping for root uid */
  222         struct  ucred ex_anon;          /* mapping for anonymous user */
  223         struct  sockaddr *ex_addr;      /* net address to which exported */
  224         int     ex_addrlen;             /* and the net address length */
  225         struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
  226         int     ex_masklen;             /* and the smask length */
  227         char    *ex_indexfile;          /* index file for WebNFS URLs */
  228 };
  229 
  230 /*
  231  * Structure holding information for a publicly exported filesystem
  232  * (WebNFS). Currently the specs allow just for one such filesystem.
  233  */
  234 struct nfs_public {
  235         int             np_valid;       /* Do we hold valid information */
  236         fhandle_t       np_handle;      /* Filehandle for pub fs (internal) */
  237         struct mount    *np_mount;      /* Mountpoint of exported fs */
  238         char            *np_index;      /* Index file */
  239 };
  240 
  241 /*
  242  * Filesystem configuration information. One of these exists for each
  243  * type of filesystem supported by the kernel. These are searched at
  244  * mount time to identify the requested filesystem.
  245  */
  246 struct vfsconf {
  247         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  248         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  249         int     vfc_typenum;            /* historic filesystem type number */
  250         int     vfc_refcount;           /* number mounted of this type */
  251         int     vfc_flags;              /* permanent flags */
  252         struct  vfsconf *vfc_next;      /* next in list */
  253 };
  254 
  255 struct ovfsconf {
  256         void    *vfc_vfsops;
  257         char    vfc_name[32];
  258         int     vfc_index;
  259         int     vfc_refcount;
  260         int     vfc_flags;
  261 };
  262 
  263 /*
  264  * NB: these flags refer to IMPLEMENTATION properties, not properties of
  265  * any actual mounts; i.e., it does not make sense to change the flags.
  266  */
  267 #define VFCF_STATIC     0x00010000      /* statically compiled into kernel */
  268 #define VFCF_NETWORK    0x00020000      /* may get data over the network */
  269 #define VFCF_READONLY   0x00040000      /* writes are not implemented */
  270 #define VFCF_SYNTHETIC  0x00080000      /* data does not represent real files */
  271 #define VFCF_LOOPBACK   0x00100000      /* aliases some other mounted FS */
  272 #define VFCF_UNICODE    0x00200000      /* stores file names as Unicode*/
  273 
  274 #ifdef KERNEL
  275 
  276 #ifdef MALLOC_DECLARE
  277 MALLOC_DECLARE(M_MOUNT);
  278 #endif
  279 extern int maxvfsconf;          /* highest defined filesystem type */
  280 extern int nfs_mount_type;      /* vfc_typenum for nfs, or -1 */
  281 extern struct vfsconf *vfsconf; /* head of list of filesystem types */
  282 
  283 /*
  284  * Operations supported on mounted file system.
  285  */
  286 #ifdef __STDC__
  287 struct nameidata;
  288 struct mbuf;
  289 #endif
  290 
  291 struct vfsops {
  292         int     (*vfs_mount)    __P((struct mount *mp, char *path, caddr_t data,
  293                                     struct nameidata *ndp, struct proc *p));
  294         int     (*vfs_start)    __P((struct mount *mp, int flags,
  295                                     struct proc *p));
  296         int     (*vfs_unmount)  __P((struct mount *mp, int mntflags,
  297                                     struct proc *p));
  298         int     (*vfs_root)     __P((struct mount *mp, struct vnode **vpp));
  299         int     (*vfs_quotactl) __P((struct mount *mp, int cmds, uid_t uid,
  300                                     caddr_t arg, struct proc *p));
  301         int     (*vfs_statfs)   __P((struct mount *mp, struct statfs *sbp,
  302                                     struct proc *p));
  303         int     (*vfs_sync)     __P((struct mount *mp, int waitfor,
  304                                     struct ucred *cred, struct proc *p));
  305         int     (*vfs_vget)     __P((struct mount *mp, ino_t ino,
  306                                     struct vnode **vpp));
  307         int     (*vfs_fhtovp)   __P((struct mount *mp, struct fid *fhp,
  308                                     struct sockaddr *nam, struct vnode **vpp,
  309                                     int *exflagsp, struct ucred **credanonp));
  310         int     (*vfs_vptofh)   __P((struct vnode *vp, struct fid *fhp));
  311         int     (*vfs_init)     __P((struct vfsconf *));
  312         int     (*vfs_uninit)   __P((struct vfsconf *));
  313         struct sysctl_oid *vfs_oid;
  314 };
  315 
  316 #define VFS_MOUNT(MP, PATH, DATA, NDP, P) \
  317         (*(MP)->mnt_op->vfs_mount)(MP, PATH, DATA, NDP, P)
  318 #define VFS_START(MP, FLAGS, P)   (*(MP)->mnt_op->vfs_start)(MP, FLAGS, P)
  319 #define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P)
  320 #define VFS_ROOT(MP, VPP)         (*(MP)->mnt_op->vfs_root)(MP, VPP)
  321 #define VFS_QUOTACTL(MP,C,U,A,P)  (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P)
  322 #define VFS_STATFS(MP, SBP, P)    (*(MP)->mnt_op->vfs_statfs)(MP, SBP, P)
  323 #define VFS_SYNC(MP, WAIT, C, P)  (*(MP)->mnt_op->vfs_sync)(MP, WAIT, C, P)
  324 #define VFS_VGET(MP, INO, VPP)    (*(MP)->mnt_op->vfs_vget)(MP, INO, VPP)
  325 #define VFS_FHTOVP(MP, FIDP, NAM, VPP, EXFLG, CRED) \
  326         (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, NAM, VPP, EXFLG, CRED)
  327 #define VFS_VPTOFH(VP, FIDP)      (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP)
  328 
  329 #if defined(VFS_LKM) && !defined(KLD_MODULE)
  330 #include <sys/conf.h>
  331 #include <sys/exec.h>
  332 #include <sys/sysent.h>
  333 #include <sys/lkm.h>
  334 
  335 #define VFS_SET(vfsops, fsname, flags) \
  336         static struct vfsconf _fs_vfsconf = { \
  337                 &vfsops, \
  338                 #fsname, \
  339                 -1, \
  340                 0, \
  341                 flags, \
  342         }; \
  343         extern struct linker_set MODVNOPS; \
  344         MOD_VFS(fsname,&MODVNOPS,&_fs_vfsconf); \
  345         int \
  346         fsname ## _mod(struct lkm_table *lkmtp, int cmd, int ver); \
  347         int \
  348         fsname ## _mod(struct lkm_table *lkmtp, int cmd, int ver) { \
  349                 MOD_DISPATCH(fsname, \
  350                 lkmtp, cmd, ver, lkm_nullcmd, lkm_nullcmd, lkm_nullcmd); } \
  351         struct __hack
  352 
  353 #else
  354 
  355 #include <sys/module.h>
  356 
  357 #define VFS_SET(vfsops, fsname, flags) \
  358         static struct vfsconf fsname ## _vfsconf = {            \
  359                 &vfsops,                                        \
  360                 #fsname,                                        \
  361                 -1,                                             \
  362                 0,                                              \
  363                 flags                                           \
  364         };                                                      \
  365         static moduledata_t fsname ## _mod = {                  \
  366                 #fsname,                                        \
  367                 vfs_modevent,                                   \
  368                 & fsname ## _vfsconf                            \
  369         };                                                      \
  370         DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
  371 
  372 #endif /* VFS_LKM */
  373 
  374 #include <net/radix.h>
  375 
  376 #define AF_MAX          33      /* XXX */
  377 
  378 /*
  379  * Network address lookup element
  380  */
  381 struct netcred {
  382         struct  radix_node netc_rnodes[2];
  383         int     netc_exflags;
  384         struct  ucred netc_anon;
  385 };
  386 
  387 /*
  388  * Network export information
  389  */
  390 struct netexport {
  391         struct  netcred ne_defexported;               /* Default export */
  392         struct  radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */
  393 };
  394 
  395 extern  char *mountrootfsname;
  396 
  397 /*
  398  * exported vnode operations
  399  */
  400 int     dounmount __P((struct mount *, int, struct proc *));
  401 int     vfs_setpublicfs                     /* set publicly exported fs */
  402           __P((struct mount *, struct netexport *, struct export_args *));
  403 int     vfs_lock __P((struct mount *));         /* lock a vfs */
  404 void    vfs_msync __P((struct mount *, int));
  405 void    vfs_unlock __P((struct mount *));       /* unlock a vfs */
  406 int     vfs_busy __P((struct mount *, int, struct simplelock *, struct proc *));
  407 int     vfs_export                          /* process mount export info */
  408           __P((struct mount *, struct netexport *, struct export_args *));
  409 struct  netcred *vfs_export_lookup          /* lookup host in fs export list */
  410           __P((struct mount *, struct netexport *, struct sockaddr *));
  411 int     vfs_allocate_syncvnode __P((struct mount *));
  412 void    vfs_getnewfsid __P((struct mount *));
  413 struct  mount *vfs_getvfs __P((fsid_t *));      /* return vfs given fsid */
  414 int     vfs_modevent __P((module_t, int, void *));
  415 int     vfs_mountedon __P((struct vnode *));    /* is a vfs mounted on vp */
  416 int     vfs_rootmountalloc __P((char *, char *, struct mount **));
  417 void    vfs_unbusy __P((struct mount *, struct proc *));
  418 void    vfs_unmountall __P((void));
  419 int     vfs_register __P((struct vfsconf *));
  420 int     vfs_unregister __P((struct vfsconf *));
  421 extern  CIRCLEQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */
  422 extern  struct simplelock mountlist_slock;
  423 extern  struct nfs_public nfs_pub;
  424 
  425 #else /* !KERNEL */
  426 
  427 #include <sys/cdefs.h>
  428 
  429 __BEGIN_DECLS
  430 int     fstatfs __P((int, struct statfs *));
  431 int     getfh __P((const char *, fhandle_t *));
  432 int     getfsstat __P((struct statfs *, long, int));
  433 int     getmntinfo __P((struct statfs **, int));
  434 int     mount __P((const char *, const char *, int, void *));
  435 int     statfs __P((const char *, struct statfs *));
  436 int     unmount __P((const char *, int));
  437 
  438 /* C library stuff */
  439 void    endvfsent __P((void));
  440 struct  ovfsconf *getvfsbyname __P((const char *));
  441 struct  ovfsconf *getvfsbytype __P((int));
  442 struct  ovfsconf *getvfsent __P((void));
  443 #define getvfsbyname    new_getvfsbyname
  444 int     new_getvfsbyname __P((const char *, struct vfsconf *));
  445 void    setvfsent __P((int));
  446 int     vfsisloadable __P((const char *));
  447 int     vfsload __P((const char *));
  448 __END_DECLS
  449 
  450 #endif /* KERNEL */
  451 
  452 #endif /* !_SYS_MOUNT_H_ */

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