The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/sys/mount.h

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    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  * 4. 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  * $FreeBSD: releng/10.0/sys/sys/mount.h 255136 2013-09-01 23:02:59Z rmacklem $
   31  */
   32 
   33 #ifndef _SYS_MOUNT_H_
   34 #define _SYS_MOUNT_H_
   35 
   36 #include <sys/ucred.h>
   37 #include <sys/queue.h>
   38 #ifdef _KERNEL
   39 #include <sys/lock.h>
   40 #include <sys/lockmgr.h>
   41 #include <sys/_mutex.h>
   42 #endif
   43 
   44 /*
   45  * NOTE: When changing statfs structure, mount structure, MNT_* flags or
   46  * MNTK_* flags also update DDB show mount command in vfs_subr.c.
   47  */
   48 
   49 typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
   50 
   51 /*
   52  * File identifier.
   53  * These are unique per filesystem on a single machine.
   54  */
   55 #define MAXFIDSZ        16
   56 
   57 struct fid {
   58         u_short         fid_len;                /* length of data in bytes */
   59         u_short         fid_data0;              /* force longword alignment */
   60         char            fid_data[MAXFIDSZ];     /* data (variable length) */
   61 };
   62 
   63 /*
   64  * filesystem statistics
   65  */
   66 #define MFSNAMELEN      16              /* length of type name including null */
   67 #define MNAMELEN        88              /* size of on/from name bufs */
   68 #define STATFS_VERSION  0x20030518      /* current version number */
   69 struct statfs {
   70         uint32_t f_version;             /* structure version number */
   71         uint32_t f_type;                /* type of filesystem */
   72         uint64_t f_flags;               /* copy of mount exported flags */
   73         uint64_t f_bsize;               /* filesystem fragment size */
   74         uint64_t f_iosize;              /* optimal transfer block size */
   75         uint64_t f_blocks;              /* total data blocks in filesystem */
   76         uint64_t f_bfree;               /* free blocks in filesystem */
   77         int64_t  f_bavail;              /* free blocks avail to non-superuser */
   78         uint64_t f_files;               /* total file nodes in filesystem */
   79         int64_t  f_ffree;               /* free nodes avail to non-superuser */
   80         uint64_t f_syncwrites;          /* count of sync writes since mount */
   81         uint64_t f_asyncwrites;         /* count of async writes since mount */
   82         uint64_t f_syncreads;           /* count of sync reads since mount */
   83         uint64_t f_asyncreads;          /* count of async reads since mount */
   84         uint64_t f_spare[10];           /* unused spare */
   85         uint32_t f_namemax;             /* maximum filename length */
   86         uid_t     f_owner;              /* user that mounted the filesystem */
   87         fsid_t    f_fsid;               /* filesystem id */
   88         char      f_charspare[80];          /* spare string space */
   89         char      f_fstypename[MFSNAMELEN]; /* filesystem type name */
   90         char      f_mntfromname[MNAMELEN];  /* mounted filesystem */
   91         char      f_mntonname[MNAMELEN];    /* directory on which mounted */
   92 };
   93 
   94 #ifdef _KERNEL
   95 #define OMFSNAMELEN     16      /* length of fs type name, including null */
   96 #define OMNAMELEN       (88 - 2 * sizeof(long)) /* size of on/from name bufs */
   97 
   98 /* XXX getfsstat.2 is out of date with write and read counter changes here. */
   99 /* XXX statfs.2 is out of date with read counter changes here. */
  100 struct ostatfs {
  101         long    f_spare2;               /* placeholder */
  102         long    f_bsize;                /* fundamental filesystem block size */
  103         long    f_iosize;               /* optimal transfer block size */
  104         long    f_blocks;               /* total data blocks in filesystem */
  105         long    f_bfree;                /* free blocks in fs */
  106         long    f_bavail;               /* free blocks avail to non-superuser */
  107         long    f_files;                /* total file nodes in filesystem */
  108         long    f_ffree;                /* free file nodes in fs */
  109         fsid_t  f_fsid;                 /* filesystem id */
  110         uid_t   f_owner;                /* user that mounted the filesystem */
  111         int     f_type;                 /* type of filesystem */
  112         int     f_flags;                /* copy of mount exported flags */
  113         long    f_syncwrites;           /* count of sync writes since mount */
  114         long    f_asyncwrites;          /* count of async writes since mount */
  115         char    f_fstypename[OMFSNAMELEN]; /* fs type name */
  116         char    f_mntonname[OMNAMELEN]; /* directory on which mounted */
  117         long    f_syncreads;            /* count of sync reads since mount */
  118         long    f_asyncreads;           /* count of async reads since mount */
  119         short   f_spares1;              /* unused spare */
  120         char    f_mntfromname[OMNAMELEN];/* mounted filesystem */
  121         short   f_spares2;              /* unused spare */
  122         /*
  123          * XXX on machines where longs are aligned to 8-byte boundaries, there
  124          * is an unnamed int32_t here.  This spare was after the apparent end
  125          * of the struct until we bit off the read counters from f_mntonname.
  126          */
  127         long    f_spare[2];             /* unused spare */
  128 };
  129 
  130 TAILQ_HEAD(vnodelst, vnode);
  131 
  132 /* Mount options list */
  133 TAILQ_HEAD(vfsoptlist, vfsopt);
  134 struct vfsopt {
  135         TAILQ_ENTRY(vfsopt) link;
  136         char    *name;
  137         void    *value;
  138         int     len;
  139         int     pos;
  140         int     seen;
  141 };
  142 
  143 /*
  144  * Structure per mounted filesystem.  Each mounted filesystem has an
  145  * array of operations and an instance record.  The filesystems are
  146  * put on a doubly linked list.
  147  *
  148  * Lock reference:
  149  *      m - mountlist_mtx
  150  *      i - interlock
  151  *      v - vnode freelist mutex
  152  *
  153  * Unmarked fields are considered stable as long as a ref is held.
  154  *
  155  */
  156 struct mount {
  157         struct mtx      mnt_mtx;                /* mount structure interlock */
  158         int             mnt_gen;                /* struct mount generation */
  159 #define mnt_startzero   mnt_list
  160         TAILQ_ENTRY(mount) mnt_list;            /* (m) mount list */
  161         struct vfsops   *mnt_op;                /* operations on fs */
  162         struct vfsconf  *mnt_vfc;               /* configuration info */
  163         struct vnode    *mnt_vnodecovered;      /* vnode we mounted on */
  164         struct vnode    *mnt_syncer;            /* syncer vnode */
  165         int             mnt_ref;                /* (i) Reference count */
  166         struct vnodelst mnt_nvnodelist;         /* (i) list of vnodes */
  167         int             mnt_nvnodelistsize;     /* (i) # of vnodes */
  168         struct vnodelst mnt_activevnodelist;    /* (v) list of active vnodes */
  169         int             mnt_activevnodelistsize;/* (v) # of active vnodes */
  170         int             mnt_writeopcount;       /* (i) write syscalls pending */
  171         int             mnt_kern_flag;          /* (i) kernel only flags */
  172         uint64_t        mnt_flag;               /* (i) flags shared with user */
  173         struct vfsoptlist *mnt_opt;             /* current mount options */
  174         struct vfsoptlist *mnt_optnew;          /* new options passed to fs */
  175         int             mnt_maxsymlinklen;      /* max size of short symlink */
  176         struct statfs   mnt_stat;               /* cache of filesystem stats */
  177         struct ucred    *mnt_cred;              /* credentials of mounter */
  178         void *          mnt_data;               /* private data */
  179         time_t          mnt_time;               /* last time written*/
  180         int             mnt_iosize_max;         /* max size for clusters, etc */
  181         struct netexport *mnt_export;           /* export list */
  182         struct label    *mnt_label;             /* MAC label for the fs */
  183         u_int           mnt_hashseed;           /* Random seed for vfs_hash */
  184         int             mnt_lockref;            /* (i) Lock reference count */
  185         int             mnt_secondary_writes;   /* (i) # of secondary writes */
  186         int             mnt_secondary_accwrites;/* (i) secondary wr. starts */
  187         struct thread   *mnt_susp_owner;        /* (i) thread owning suspension */
  188 #define mnt_endzero     mnt_gjprovider
  189         char            *mnt_gjprovider;        /* gjournal provider name */
  190         struct lock     mnt_explock;            /* vfs_export walkers lock */
  191         TAILQ_ENTRY(mount) mnt_upper_link;      /* (m) we in the all uppers */
  192         TAILQ_HEAD(, mount) mnt_uppers;         /* (m) upper mounts over us*/
  193 };
  194 
  195 /*
  196  * Definitions for MNT_VNODE_FOREACH_ALL.
  197  */
  198 struct vnode *__mnt_vnode_next_all(struct vnode **mvp, struct mount *mp);
  199 struct vnode *__mnt_vnode_first_all(struct vnode **mvp, struct mount *mp);
  200 void          __mnt_vnode_markerfree_all(struct vnode **mvp, struct mount *mp);
  201 
  202 #define MNT_VNODE_FOREACH_ALL(vp, mp, mvp)                              \
  203         for (vp = __mnt_vnode_first_all(&(mvp), (mp));                  \
  204                 (vp) != NULL; vp = __mnt_vnode_next_all(&(mvp), (mp)))
  205 
  206 #define MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp)                            \
  207         do {                                                            \
  208                 MNT_ILOCK(mp);                                          \
  209                 __mnt_vnode_markerfree_all(&(mvp), (mp));               \
  210                 /* MNT_IUNLOCK(mp); -- done in above function */        \
  211                 mtx_assert(MNT_MTX(mp), MA_NOTOWNED);                   \
  212         } while (0)
  213 
  214 /*
  215  * Definitions for MNT_VNODE_FOREACH_ACTIVE.
  216  */
  217 struct vnode *__mnt_vnode_next_active(struct vnode **mvp, struct mount *mp);
  218 struct vnode *__mnt_vnode_first_active(struct vnode **mvp, struct mount *mp);
  219 void          __mnt_vnode_markerfree_active(struct vnode **mvp, struct mount *);
  220 
  221 #define MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp)                           \
  222         for (vp = __mnt_vnode_first_active(&(mvp), (mp));               \
  223                 (vp) != NULL; vp = __mnt_vnode_next_active(&(mvp), (mp)))
  224 
  225 #define MNT_VNODE_FOREACH_ACTIVE_ABORT(mp, mvp)                         \
  226         __mnt_vnode_markerfree_active(&(mvp), (mp))
  227 
  228 #define MNT_ILOCK(mp)   mtx_lock(&(mp)->mnt_mtx)
  229 #define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
  230 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
  231 #define MNT_MTX(mp)     (&(mp)->mnt_mtx)
  232 #define MNT_REF(mp)     (mp)->mnt_ref++
  233 #define MNT_REL(mp)     do {                                            \
  234         KASSERT((mp)->mnt_ref > 0, ("negative mnt_ref"));               \
  235         (mp)->mnt_ref--;                                                \
  236         if ((mp)->mnt_ref == 0)                                         \
  237                 wakeup((mp));                                           \
  238 } while (0)
  239 
  240 #endif /* _KERNEL */
  241 
  242 /*
  243  * User specifiable flags, stored in mnt_flag.
  244  */
  245 #define MNT_RDONLY      0x0000000000000001ULL /* read only filesystem */
  246 #define MNT_SYNCHRONOUS 0x0000000000000002ULL /* fs written synchronously */
  247 #define MNT_NOEXEC      0x0000000000000004ULL /* can't exec from filesystem */
  248 #define MNT_NOSUID      0x0000000000000008ULL /* don't honor setuid fs bits */
  249 #define MNT_NFS4ACLS    0x0000000000000010ULL /* enable NFS version 4 ACLs */
  250 #define MNT_UNION       0x0000000000000020ULL /* union with underlying fs */
  251 #define MNT_ASYNC       0x0000000000000040ULL /* fs written asynchronously */
  252 #define MNT_SUIDDIR     0x0000000000100000ULL /* special SUID dir handling */
  253 #define MNT_SOFTDEP     0x0000000000200000ULL /* using soft updates */
  254 #define MNT_NOSYMFOLLOW 0x0000000000400000ULL /* do not follow symlinks */
  255 #define MNT_GJOURNAL    0x0000000002000000ULL /* GEOM journal support enabled */
  256 #define MNT_MULTILABEL  0x0000000004000000ULL /* MAC support for objects */
  257 #define MNT_ACLS        0x0000000008000000ULL /* ACL support enabled */
  258 #define MNT_NOATIME     0x0000000010000000ULL /* dont update file access time */
  259 #define MNT_NOCLUSTERR  0x0000000040000000ULL /* disable cluster read */
  260 #define MNT_NOCLUSTERW  0x0000000080000000ULL /* disable cluster write */
  261 #define MNT_SUJ         0x0000000100000000ULL /* using journaled soft updates */
  262 
  263 /*
  264  * NFS export related mount flags.
  265  */
  266 #define MNT_EXRDONLY    0x0000000000000080ULL   /* exported read only */
  267 #define MNT_EXPORTED    0x0000000000000100ULL   /* filesystem is exported */
  268 #define MNT_DEFEXPORTED 0x0000000000000200ULL   /* exported to the world */
  269 #define MNT_EXPORTANON  0x0000000000000400ULL   /* anon uid mapping for all */
  270 #define MNT_EXKERB      0x0000000000000800ULL   /* exported with Kerberos */
  271 #define MNT_EXPUBLIC    0x0000000020000000ULL   /* public export (WebNFS) */
  272 
  273 /*
  274  * Flags set by internal operations,
  275  * but visible to the user.
  276  * XXX some of these are not quite right.. (I've never seen the root flag set)
  277  */
  278 #define MNT_LOCAL       0x0000000000001000ULL /* filesystem is stored locally */
  279 #define MNT_QUOTA       0x0000000000002000ULL /* quotas are enabled on fs */
  280 #define MNT_ROOTFS      0x0000000000004000ULL /* identifies the root fs */
  281 #define MNT_USER        0x0000000000008000ULL /* mounted by a user */
  282 #define MNT_IGNORE      0x0000000000800000ULL /* do not show entry in df */
  283 
  284 /*
  285  * Mask of flags that are visible to statfs().
  286  * XXX I think that this could now become (~(MNT_CMDFLAGS))
  287  * but the 'mount' program may need changing to handle this.
  288  */
  289 #define MNT_VISFLAGMASK (MNT_RDONLY     | MNT_SYNCHRONOUS | MNT_NOEXEC  | \
  290                         MNT_NOSUID      | MNT_UNION     | MNT_SUJ       | \
  291                         MNT_ASYNC       | MNT_EXRDONLY  | MNT_EXPORTED  | \
  292                         MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB    | \
  293                         MNT_LOCAL       | MNT_USER      | MNT_QUOTA     | \
  294                         MNT_ROOTFS      | MNT_NOATIME   | MNT_NOCLUSTERR| \
  295                         MNT_NOCLUSTERW  | MNT_SUIDDIR   | MNT_SOFTDEP   | \
  296                         MNT_IGNORE      | MNT_EXPUBLIC  | MNT_NOSYMFOLLOW | \
  297                         MNT_GJOURNAL    | MNT_MULTILABEL | MNT_ACLS     | \
  298                         MNT_NFS4ACLS)
  299 
  300 /* Mask of flags that can be updated. */
  301 #define MNT_UPDATEMASK (MNT_NOSUID      | MNT_NOEXEC    | \
  302                         MNT_SYNCHRONOUS | MNT_UNION     | MNT_ASYNC     | \
  303                         MNT_NOATIME | \
  304                         MNT_NOSYMFOLLOW | MNT_IGNORE    | \
  305                         MNT_NOCLUSTERR  | MNT_NOCLUSTERW | MNT_SUIDDIR  | \
  306                         MNT_ACLS        | MNT_USER | MNT_NFS4ACLS)
  307 
  308 /*
  309  * External filesystem command modifier flags.
  310  * Unmount can use the MNT_FORCE flag.
  311  * XXX: These are not STATES and really should be somewhere else.
  312  * XXX: MNT_BYFSID collides with MNT_ACLS, but because MNT_ACLS is only used for
  313  *      mount(2) and MNT_BYFSID is only used for unmount(2) it's harmless.
  314  */
  315 #define MNT_UPDATE      0x0000000000010000ULL /* not real mount, just update */
  316 #define MNT_DELEXPORT   0x0000000000020000ULL /* delete export host lists */
  317 #define MNT_RELOAD      0x0000000000040000ULL /* reload filesystem data */
  318 #define MNT_FORCE       0x0000000000080000ULL /* force unmount or readonly */
  319 #define MNT_SNAPSHOT    0x0000000001000000ULL /* snapshot the filesystem */
  320 #define MNT_BYFSID      0x0000000008000000ULL /* specify filesystem by ID. */
  321 #define MNT_CMDFLAGS   (MNT_UPDATE      | MNT_DELEXPORT | MNT_RELOAD    | \
  322                         MNT_FORCE       | MNT_SNAPSHOT  | MNT_BYFSID)
  323 /*
  324  * Internal filesystem control flags stored in mnt_kern_flag.
  325  *
  326  * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
  327  * past the mount point.  This keeps the subtree stable during mounts
  328  * and unmounts.
  329  *
  330  * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
  331  * dounmount() is still waiting to lock the mountpoint. This allows
  332  * the filesystem to cancel operations that might otherwise deadlock
  333  * with the unmount attempt (used by NFS).
  334  *
  335  * MNTK_NOINSMNTQ is strict subset of MNTK_UNMOUNT. They are separated
  336  * to allow for failed unmount attempt to restore the syncer vnode for
  337  * the mount.
  338  */
  339 #define MNTK_UNMOUNTF   0x00000001      /* forced unmount in progress */
  340 #define MNTK_ASYNC      0x00000002      /* filtered async flag */
  341 #define MNTK_SOFTDEP    0x00000004      /* async disabled by softdep */
  342 #define MNTK_NOINSMNTQ  0x00000008      /* insmntque is not allowed */
  343 #define MNTK_DRAINING   0x00000010      /* lock draining is happening */
  344 #define MNTK_REFEXPIRE  0x00000020      /* refcount expiring is happening */
  345 #define MNTK_EXTENDED_SHARED    0x00000040 /* Allow shared locking for more ops */
  346 #define MNTK_SHARED_WRITES      0x00000080 /* Allow shared locking for writes */
  347 #define MNTK_NO_IOPF    0x00000100      /* Disallow page faults during reads
  348                                            and writes. Filesystem shall properly
  349                                            handle i/o state on EFAULT. */
  350 #define MNTK_VGONE_UPPER        0x00000200
  351 #define MNTK_VGONE_WAITER       0x00000400
  352 #define MNTK_LOOKUP_EXCL_DOTDOT 0x00000800
  353 #define MNTK_MARKER             0x00001000
  354 #define MNTK_UNMAPPED_BUFS      0x00002000
  355 #define MNTK_NOASYNC    0x00800000      /* disable async */
  356 #define MNTK_UNMOUNT    0x01000000      /* unmount in progress */
  357 #define MNTK_MWAIT      0x02000000      /* waiting for unmount to finish */
  358 #define MNTK_SUSPEND    0x08000000      /* request write suspension */
  359 #define MNTK_SUSPEND2   0x04000000      /* block secondary writes */
  360 #define MNTK_SUSPENDED  0x10000000      /* write operations are suspended */
  361 #define MNTK_UNUSED25   0x20000000      /*  --available-- */
  362 #define MNTK_LOOKUP_SHARED      0x40000000 /* FS supports shared lock lookups */
  363 #define MNTK_NOKNOTE    0x80000000      /* Don't send KNOTEs from VOP hooks */
  364 
  365 #define MNT_SHARED_WRITES(mp) (((mp) != NULL) &&        \
  366                                 ((mp)->mnt_kern_flag & MNTK_SHARED_WRITES))
  367 
  368 /*
  369  * Sysctl CTL_VFS definitions.
  370  *
  371  * Second level identifier specifies which filesystem. Second level
  372  * identifier VFS_VFSCONF returns information about all filesystems.
  373  * Second level identifier VFS_GENERIC is non-terminal.
  374  */
  375 #define VFS_VFSCONF             0       /* get configured filesystems */
  376 #define VFS_GENERIC             0       /* generic filesystem information */
  377 /*
  378  * Third level identifiers for VFS_GENERIC are given below; third
  379  * level identifiers for specific filesystems are given in their
  380  * mount specific header files.
  381  */
  382 #define VFS_MAXTYPENUM  1       /* int: highest defined filesystem type */
  383 #define VFS_CONF        2       /* struct: vfsconf for filesystem given
  384                                    as next argument */
  385 
  386 /*
  387  * Flags for various system call interfaces.
  388  *
  389  * waitfor flags to vfs_sync() and getfsstat()
  390  */
  391 #define MNT_WAIT        1       /* synchronously wait for I/O to complete */
  392 #define MNT_NOWAIT      2       /* start all I/O, but do not wait for it */
  393 #define MNT_LAZY        3       /* push data not written by filesystem syncer */
  394 #define MNT_SUSPEND     4       /* Suspend file system after sync */
  395 
  396 /*
  397  * Generic file handle
  398  */
  399 struct fhandle {
  400         fsid_t  fh_fsid;        /* Filesystem id of mount point */
  401         struct  fid fh_fid;     /* Filesys specific id */
  402 };
  403 typedef struct fhandle  fhandle_t;
  404 
  405 /*
  406  * Old export arguments without security flavor list
  407  */
  408 struct oexport_args {
  409         int     ex_flags;               /* export related flags */
  410         uid_t   ex_root;                /* mapping for root uid */
  411         struct  xucred ex_anon;         /* mapping for anonymous user */
  412         struct  sockaddr *ex_addr;      /* net address to which exported */
  413         u_char  ex_addrlen;             /* and the net address length */
  414         struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
  415         u_char  ex_masklen;             /* and the smask length */
  416         char    *ex_indexfile;          /* index file for WebNFS URLs */
  417 };
  418 
  419 /*
  420  * Export arguments for local filesystem mount calls.
  421  */
  422 #define MAXSECFLAVORS   5
  423 struct export_args {
  424         int     ex_flags;               /* export related flags */
  425         uid_t   ex_root;                /* mapping for root uid */
  426         struct  xucred ex_anon;         /* mapping for anonymous user */
  427         struct  sockaddr *ex_addr;      /* net address to which exported */
  428         u_char  ex_addrlen;             /* and the net address length */
  429         struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
  430         u_char  ex_masklen;             /* and the smask length */
  431         char    *ex_indexfile;          /* index file for WebNFS URLs */
  432         int     ex_numsecflavors;       /* security flavor count */
  433         int     ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */
  434 };
  435 
  436 /*
  437  * Structure holding information for a publicly exported filesystem
  438  * (WebNFS). Currently the specs allow just for one such filesystem.
  439  */
  440 struct nfs_public {
  441         int             np_valid;       /* Do we hold valid information */
  442         fhandle_t       np_handle;      /* Filehandle for pub fs (internal) */
  443         struct mount    *np_mount;      /* Mountpoint of exported fs */
  444         char            *np_index;      /* Index file */
  445 };
  446 
  447 /*
  448  * Filesystem configuration information. One of these exists for each
  449  * type of filesystem supported by the kernel. These are searched at
  450  * mount time to identify the requested filesystem.
  451  *
  452  * XXX: Never change the first two arguments!
  453  */
  454 struct vfsconf {
  455         u_int   vfc_version;            /* ABI version number */
  456         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  457         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  458         int     vfc_typenum;            /* historic filesystem type number */
  459         int     vfc_refcount;           /* number mounted of this type */
  460         int     vfc_flags;              /* permanent flags */
  461         struct  vfsoptdecl *vfc_opts;   /* mount options */
  462         TAILQ_ENTRY(vfsconf) vfc_list;  /* list of vfscons */
  463 };
  464 
  465 /* Userland version of the struct vfsconf. */
  466 struct xvfsconf {
  467         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  468         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  469         int     vfc_typenum;            /* historic filesystem type number */
  470         int     vfc_refcount;           /* number mounted of this type */
  471         int     vfc_flags;              /* permanent flags */
  472         struct  vfsconf *vfc_next;      /* next in list */
  473 };
  474 
  475 #ifndef BURN_BRIDGES
  476 struct ovfsconf {
  477         void    *vfc_vfsops;
  478         char    vfc_name[32];
  479         int     vfc_index;
  480         int     vfc_refcount;
  481         int     vfc_flags;
  482 };
  483 #endif
  484 
  485 /*
  486  * NB: these flags refer to IMPLEMENTATION properties, not properties of
  487  * any actual mounts; i.e., it does not make sense to change the flags.
  488  */
  489 #define VFCF_STATIC     0x00010000      /* statically compiled into kernel */
  490 #define VFCF_NETWORK    0x00020000      /* may get data over the network */
  491 #define VFCF_READONLY   0x00040000      /* writes are not implemented */
  492 #define VFCF_SYNTHETIC  0x00080000      /* data does not represent real files */
  493 #define VFCF_LOOPBACK   0x00100000      /* aliases some other mounted FS */
  494 #define VFCF_UNICODE    0x00200000      /* stores file names as Unicode */
  495 #define VFCF_JAIL       0x00400000      /* can be mounted from within a jail */
  496 #define VFCF_DELEGADMIN 0x00800000      /* supports delegated administration */
  497 #define VFCF_SBDRY      0x01000000      /* defer stop requests */
  498 
  499 typedef uint32_t fsctlop_t;
  500 
  501 struct vfsidctl {
  502         int             vc_vers;        /* should be VFSIDCTL_VERS1 (below) */
  503         fsid_t          vc_fsid;        /* fsid to operate on */
  504         char            vc_fstypename[MFSNAMELEN];
  505                                         /* type of fs 'nfs' or '*' */
  506         fsctlop_t       vc_op;          /* operation VFS_CTL_* (below) */
  507         void            *vc_ptr;        /* pointer to data structure */
  508         size_t          vc_len;         /* sizeof said structure */
  509         u_int32_t       vc_spare[12];   /* spare (must be zero) */
  510 };
  511 
  512 /* vfsidctl API version. */
  513 #define VFS_CTL_VERS1   0x01
  514 
  515 /*
  516  * New style VFS sysctls, do not reuse/conflict with the namespace for
  517  * private sysctls.
  518  * All "global" sysctl ops have the 33rd bit set:
  519  * 0x...1....
  520  * Private sysctl ops should have the 33rd bit unset.
  521  */
  522 #define VFS_CTL_QUERY   0x00010001      /* anything wrong? (vfsquery) */
  523 #define VFS_CTL_TIMEO   0x00010002      /* set timeout for vfs notification */
  524 #define VFS_CTL_NOLOCKS 0x00010003      /* disable file locking */
  525 
  526 struct vfsquery {
  527         u_int32_t       vq_flags;
  528         u_int32_t       vq_spare[31];
  529 };
  530 
  531 /* vfsquery flags */
  532 #define VQ_NOTRESP      0x0001  /* server down */
  533 #define VQ_NEEDAUTH     0x0002  /* server bad auth */
  534 #define VQ_LOWDISK      0x0004  /* we're low on space */
  535 #define VQ_MOUNT        0x0008  /* new filesystem arrived */
  536 #define VQ_UNMOUNT      0x0010  /* filesystem has left */
  537 #define VQ_DEAD         0x0020  /* filesystem is dead, needs force unmount */
  538 #define VQ_ASSIST       0x0040  /* filesystem needs assistance from external
  539                                    program */
  540 #define VQ_NOTRESPLOCK  0x0080  /* server lockd down */
  541 #define VQ_FLAG0100     0x0100  /* placeholder */
  542 #define VQ_FLAG0200     0x0200  /* placeholder */
  543 #define VQ_FLAG0400     0x0400  /* placeholder */
  544 #define VQ_FLAG0800     0x0800  /* placeholder */
  545 #define VQ_FLAG1000     0x1000  /* placeholder */
  546 #define VQ_FLAG2000     0x2000  /* placeholder */
  547 #define VQ_FLAG4000     0x4000  /* placeholder */
  548 #define VQ_FLAG8000     0x8000  /* placeholder */
  549 
  550 #ifdef _KERNEL
  551 /* Point a sysctl request at a vfsidctl's data. */
  552 #define VCTLTOREQ(vc, req)                                              \
  553         do {                                                            \
  554                 (req)->newptr = (vc)->vc_ptr;                           \
  555                 (req)->newlen = (vc)->vc_len;                           \
  556                 (req)->newidx = 0;                                      \
  557         } while (0)
  558 #endif
  559 
  560 struct iovec;
  561 struct uio;
  562 
  563 #ifdef _KERNEL
  564 
  565 /*
  566  * vfs_busy specific flags and mask.
  567  */
  568 #define MBF_NOWAIT      0x01
  569 #define MBF_MNTLSTLOCK  0x02
  570 #define MBF_MASK        (MBF_NOWAIT | MBF_MNTLSTLOCK)
  571 
  572 #ifdef MALLOC_DECLARE
  573 MALLOC_DECLARE(M_MOUNT);
  574 #endif
  575 extern int maxvfsconf;          /* highest defined filesystem type */
  576 extern int nfs_mount_type;      /* vfc_typenum for nfs, or -1 */
  577 
  578 TAILQ_HEAD(vfsconfhead, vfsconf);
  579 extern struct vfsconfhead vfsconf;
  580 
  581 /*
  582  * Operations supported on mounted filesystem.
  583  */
  584 struct mount_args;
  585 struct nameidata;
  586 struct sysctl_req;
  587 struct mntarg;
  588 
  589 typedef int vfs_cmount_t(struct mntarg *ma, void *data, uint64_t flags);
  590 typedef int vfs_unmount_t(struct mount *mp, int mntflags);
  591 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp);
  592 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, void *arg);
  593 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp);
  594 typedef int vfs_sync_t(struct mount *mp, int waitfor);
  595 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
  596                     struct vnode **vpp);
  597 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp,
  598                     int flags, struct vnode **vpp);
  599 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
  600                     int *extflagsp, struct ucred **credanonp,
  601                     int *numsecflavors, int **secflavors);
  602 typedef int vfs_init_t(struct vfsconf *);
  603 typedef int vfs_uninit_t(struct vfsconf *);
  604 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
  605                     struct vnode *filename_vp, int attrnamespace,
  606                     const char *attrname);
  607 typedef int vfs_mount_t(struct mount *mp);
  608 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
  609                     struct sysctl_req *req);
  610 typedef void vfs_susp_clean_t(struct mount *mp);
  611 typedef void vfs_notify_lowervp_t(struct mount *mp, struct vnode *lowervp);
  612 typedef void vfs_purge_t(struct mount *mp);
  613 
  614 struct vfsops {
  615         vfs_mount_t             *vfs_mount;
  616         vfs_cmount_t            *vfs_cmount;
  617         vfs_unmount_t           *vfs_unmount;
  618         vfs_root_t              *vfs_root;
  619         vfs_quotactl_t          *vfs_quotactl;
  620         vfs_statfs_t            *vfs_statfs;
  621         vfs_sync_t              *vfs_sync;
  622         vfs_vget_t              *vfs_vget;
  623         vfs_fhtovp_t            *vfs_fhtovp;
  624         vfs_checkexp_t          *vfs_checkexp;
  625         vfs_init_t              *vfs_init;
  626         vfs_uninit_t            *vfs_uninit;
  627         vfs_extattrctl_t        *vfs_extattrctl;
  628         vfs_sysctl_t            *vfs_sysctl;
  629         vfs_susp_clean_t        *vfs_susp_clean;
  630         vfs_notify_lowervp_t    *vfs_reclaim_lowervp;
  631         vfs_notify_lowervp_t    *vfs_unlink_lowervp;
  632         vfs_purge_t             *vfs_purge;
  633         vfs_mount_t             *vfs_spare[6];  /* spares for ABI compat */
  634 };
  635 
  636 vfs_statfs_t    __vfs_statfs;
  637 
  638 #define VFS_PROLOGUE(MP)        do {                                    \
  639         int _enable_stops;                                              \
  640                                                                         \
  641         _enable_stops = ((MP) != NULL &&                                \
  642             ((MP)->mnt_vfc->vfc_flags & VFCF_SBDRY) && sigdeferstop())
  643 
  644 #define VFS_EPILOGUE(MP)                                                \
  645         if (_enable_stops)                                              \
  646                 sigallowstop();                                         \
  647 } while (0)
  648 
  649 #define VFS_MOUNT(MP) ({                                                \
  650         int _rc;                                                        \
  651                                                                         \
  652         VFS_PROLOGUE(MP);                                               \
  653         _rc = (*(MP)->mnt_op->vfs_mount)(MP);                           \
  654         VFS_EPILOGUE(MP);                                               \
  655         _rc; })
  656 
  657 #define VFS_UNMOUNT(MP, FORCE) ({                                       \
  658         int _rc;                                                        \
  659                                                                         \
  660         VFS_PROLOGUE(MP);                                               \
  661         _rc = (*(MP)->mnt_op->vfs_unmount)(MP, FORCE);                  \
  662         VFS_EPILOGUE(MP);                                               \
  663         _rc; })
  664 
  665 #define VFS_ROOT(MP, FLAGS, VPP) ({                                     \
  666         int _rc;                                                        \
  667                                                                         \
  668         VFS_PROLOGUE(MP);                                               \
  669         _rc = (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP);                \
  670         VFS_EPILOGUE(MP);                                               \
  671         _rc; })
  672 
  673 #define VFS_QUOTACTL(MP, C, U, A) ({                                    \
  674         int _rc;                                                        \
  675                                                                         \
  676         VFS_PROLOGUE(MP);                                               \
  677         _rc = (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A);               \
  678         VFS_EPILOGUE(MP);                                               \
  679         _rc; })
  680 
  681 #define VFS_STATFS(MP, SBP) ({                                          \
  682         int _rc;                                                        \
  683                                                                         \
  684         VFS_PROLOGUE(MP);                                               \
  685         _rc = __vfs_statfs((MP), (SBP));                                \
  686         VFS_EPILOGUE(MP);                                               \
  687         _rc; })
  688 
  689 #define VFS_SYNC(MP, WAIT) ({                                           \
  690         int _rc;                                                        \
  691                                                                         \
  692         VFS_PROLOGUE(MP);                                               \
  693         _rc = (*(MP)->mnt_op->vfs_sync)(MP, WAIT);                      \
  694         VFS_EPILOGUE(MP);                                               \
  695         _rc; })
  696 
  697 #define VFS_VGET(MP, INO, FLAGS, VPP) ({                                \
  698         int _rc;                                                        \
  699                                                                         \
  700         VFS_PROLOGUE(MP);                                               \
  701         _rc = (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP);           \
  702         VFS_EPILOGUE(MP);                                               \
  703         _rc; })
  704 
  705 #define VFS_FHTOVP(MP, FIDP, FLAGS, VPP) ({                             \
  706         int _rc;                                                        \
  707                                                                         \
  708         VFS_PROLOGUE(MP);                                               \
  709         _rc = (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, FLAGS, VPP);        \
  710         VFS_EPILOGUE(MP);                                               \
  711         _rc; })
  712 
  713 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED, NUMSEC, SEC) ({              \
  714         int _rc;                                                        \
  715                                                                         \
  716         VFS_PROLOGUE(MP);                                               \
  717         _rc = (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED, NUMSEC,\
  718             SEC);                                                       \
  719         VFS_EPILOGUE(MP);                                               \
  720         _rc; })
  721 
  722 #define VFS_EXTATTRCTL(MP, C, FN, NS, N) ({                             \
  723         int _rc;                                                        \
  724                                                                         \
  725         VFS_PROLOGUE(MP);                                               \
  726         _rc = (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N);        \
  727         VFS_EPILOGUE(MP);                                               \
  728         _rc; })
  729 
  730 #define VFS_SYSCTL(MP, OP, REQ) ({                                      \
  731         int _rc;                                                        \
  732                                                                         \
  733         VFS_PROLOGUE(MP);                                               \
  734         _rc = (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ);                 \
  735         VFS_EPILOGUE(MP);                                               \
  736         _rc; })
  737 
  738 #define VFS_SUSP_CLEAN(MP) do {                                         \
  739         if (*(MP)->mnt_op->vfs_susp_clean != NULL) {                    \
  740                 VFS_PROLOGUE(MP);                                       \
  741                 (*(MP)->mnt_op->vfs_susp_clean)(MP);                    \
  742                 VFS_EPILOGUE(MP);                                       \
  743         }                                                               \
  744 } while (0)
  745 
  746 #define VFS_RECLAIM_LOWERVP(MP, VP) do {                                \
  747         if (*(MP)->mnt_op->vfs_reclaim_lowervp != NULL) {               \
  748                 VFS_PROLOGUE(MP);                                       \
  749                 (*(MP)->mnt_op->vfs_reclaim_lowervp)((MP), (VP));       \
  750                 VFS_EPILOGUE(MP);                                       \
  751         }                                                               \
  752 } while (0)
  753 
  754 #define VFS_UNLINK_LOWERVP(MP, VP) do {                                 \
  755         if (*(MP)->mnt_op->vfs_unlink_lowervp != NULL) {                \
  756                 VFS_PROLOGUE(MP);                                       \
  757                 (*(MP)->mnt_op->vfs_unlink_lowervp)((MP), (VP));        \
  758                 VFS_EPILOGUE(MP);                                       \
  759         }                                                               \
  760 } while (0)
  761 
  762 #define VFS_PURGE(MP) do {                                              \
  763         if (*(MP)->mnt_op->vfs_purge != NULL) {                         \
  764                 VFS_PROLOGUE(MP);                                       \
  765                 (*(MP)->mnt_op->vfs_purge)(MP);                         \
  766                 VFS_EPILOGUE(MP);                                       \
  767         }                                                               \
  768 } while (0)
  769 
  770 #define VFS_KNOTE_LOCKED(vp, hint) do                                   \
  771 {                                                                       \
  772         if (((vp)->v_vflag & VV_NOKNOTE) == 0)                          \
  773                 VN_KNOTE((vp), (hint), KNF_LISTLOCKED);                 \
  774 } while (0)
  775 
  776 #define VFS_KNOTE_UNLOCKED(vp, hint) do                                 \
  777 {                                                                       \
  778         if (((vp)->v_vflag & VV_NOKNOTE) == 0)                          \
  779                 VN_KNOTE((vp), (hint), 0);                              \
  780 } while (0)
  781 
  782 #define VFS_NOTIFY_UPPER_RECLAIM        1
  783 #define VFS_NOTIFY_UPPER_UNLINK         2
  784 
  785 #include <sys/module.h>
  786 
  787 /*
  788  * Version numbers.
  789  */
  790 #define VFS_VERSION_00  0x19660120
  791 #define VFS_VERSION_01  0x20121030
  792 #define VFS_VERSION     VFS_VERSION_01
  793 
  794 #define VFS_SET(vfsops, fsname, flags) \
  795         static struct vfsconf fsname ## _vfsconf = {            \
  796                 .vfc_version = VFS_VERSION,                     \
  797                 .vfc_name = #fsname,                            \
  798                 .vfc_vfsops = &vfsops,                          \
  799                 .vfc_typenum = -1,                              \
  800                 .vfc_flags = flags,                             \
  801         };                                                      \
  802         static moduledata_t fsname ## _mod = {                  \
  803                 #fsname,                                        \
  804                 vfs_modevent,                                   \
  805                 & fsname ## _vfsconf                            \
  806         };                                                      \
  807         DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
  808 
  809 extern  char *mountrootfsname;
  810 
  811 /*
  812  * exported vnode operations
  813  */
  814 
  815 int     dounmount(struct mount *, int, struct thread *);
  816 
  817 int     kernel_mount(struct mntarg *ma, uint64_t flags);
  818 int     kernel_vmount(int flags, ...);
  819 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
  820 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
  821 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
  822 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
  823 void    statfs_scale_blocks(struct statfs *sf, long max_size);
  824 struct vfsconf *vfs_byname(const char *);
  825 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
  826 void    vfs_mount_destroy(struct mount *);
  827 void    vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
  828 void    vfs_freeopts(struct vfsoptlist *opts);
  829 void    vfs_deleteopt(struct vfsoptlist *opts, const char *name);
  830 int     vfs_buildopts(struct uio *auio, struct vfsoptlist **options);
  831 int     vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
  832             uint64_t val);
  833 int     vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
  834 int     vfs_getopt_pos(struct vfsoptlist *opts, const char *name);
  835 int     vfs_getopt_size(struct vfsoptlist *opts, const char *name,
  836             off_t *value);
  837 char    *vfs_getopts(struct vfsoptlist *, const char *, int *error);
  838 int     vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
  839 int     vfs_filteropt(struct vfsoptlist *, const char **legal);
  840 void    vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...);
  841 int     vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
  842 int     vfs_setopt(struct vfsoptlist *opts, const char *name, void *value,
  843             int len);
  844 int     vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value,
  845             int len);
  846 int     vfs_setopts(struct vfsoptlist *opts, const char *name,
  847             const char *value);
  848 int     vfs_setpublicfs                     /* set publicly exported fs */
  849             (struct mount *, struct netexport *, struct export_args *);
  850 void    vfs_msync(struct mount *, int);
  851 int     vfs_busy(struct mount *, int);
  852 int     vfs_export                       /* process mount export info */
  853             (struct mount *, struct export_args *);
  854 void    vfs_allocate_syncvnode(struct mount *);
  855 void    vfs_deallocate_syncvnode(struct mount *);
  856 int     vfs_donmount(struct thread *td, uint64_t fsflags,
  857             struct uio *fsoptions);
  858 void    vfs_getnewfsid(struct mount *);
  859 struct cdev *vfs_getrootfsid(struct mount *);
  860 struct  mount *vfs_getvfs(fsid_t *);      /* return vfs given fsid */
  861 struct  mount *vfs_busyfs(fsid_t *);
  862 int     vfs_modevent(module_t, int, void *);
  863 void    vfs_mount_error(struct mount *, const char *, ...);
  864 void    vfs_mountroot(void);                    /* mount our root filesystem */
  865 void    vfs_mountedfrom(struct mount *, const char *from);
  866 void    vfs_notify_upper(struct vnode *, int);
  867 void    vfs_oexport_conv(const struct oexport_args *oexp,
  868             struct export_args *exp);
  869 void    vfs_ref(struct mount *);
  870 void    vfs_rel(struct mount *);
  871 struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *,
  872             struct ucred *);
  873 int     vfs_suser(struct mount *, struct thread *);
  874 void    vfs_unbusy(struct mount *);
  875 void    vfs_unmountall(void);
  876 extern  TAILQ_HEAD(mntlist, mount) mountlist;   /* mounted filesystem list */
  877 extern  struct mtx mountlist_mtx;
  878 extern  struct nfs_public nfs_pub;
  879 
  880 /*
  881  * Declarations for these vfs default operations are located in
  882  * kern/vfs_default.c.  They will be automatically used to replace
  883  * null entries in VFS ops tables when registering a new filesystem
  884  * type in the global table.
  885  */
  886 vfs_root_t              vfs_stdroot;
  887 vfs_quotactl_t          vfs_stdquotactl;
  888 vfs_statfs_t            vfs_stdstatfs;
  889 vfs_sync_t              vfs_stdsync;
  890 vfs_sync_t              vfs_stdnosync;
  891 vfs_vget_t              vfs_stdvget;
  892 vfs_fhtovp_t            vfs_stdfhtovp;
  893 vfs_checkexp_t          vfs_stdcheckexp;
  894 vfs_init_t              vfs_stdinit;
  895 vfs_uninit_t            vfs_stduninit;
  896 vfs_extattrctl_t        vfs_stdextattrctl;
  897 vfs_sysctl_t            vfs_stdsysctl;
  898 
  899 #else /* !_KERNEL */
  900 
  901 #include <sys/cdefs.h>
  902 
  903 struct stat;
  904 
  905 __BEGIN_DECLS
  906 int     fhopen(const struct fhandle *, int);
  907 int     fhstat(const struct fhandle *, struct stat *);
  908 int     fhstatfs(const struct fhandle *, struct statfs *);
  909 int     fstatfs(int, struct statfs *);
  910 int     getfh(const char *, fhandle_t *);
  911 int     getfsstat(struct statfs *, long, int);
  912 int     getmntinfo(struct statfs **, int);
  913 int     lgetfh(const char *, fhandle_t *);
  914 int     mount(const char *, const char *, int, void *);
  915 int     nmount(struct iovec *, unsigned int, int);
  916 int     statfs(const char *, struct statfs *);
  917 int     unmount(const char *, int);
  918 
  919 /* C library stuff */
  920 int     getvfsbyname(const char *, struct xvfsconf *);
  921 __END_DECLS
  922 
  923 #endif /* _KERNEL */
  924 
  925 #endif /* !_SYS_MOUNT_H_ */

Cache object: 1b107ae7f6a1dfaf03fcbc68f6da4b09


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.