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: src/sys/sys/mount.h,v 1.89.2.7 2003/04/04 20:35:57 tegge Exp $
   35  */
   36 
   37 #ifndef _SYS_MOUNT_H_
   38 #define _SYS_MOUNT_H_
   39 
   40 #include <sys/ucred.h>
   41 #include <sys/tree.h>
   42 
   43 #ifndef _KERNEL
   44 #if !defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE)
   45 #include <sys/stat.h>
   46 #endif /* !_POSIX_C_SOURCE */
   47 #endif /* !_KERNEL */
   48 
   49 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
   50 #ifndef _SYS_QUEUE_H_
   51 #include <sys/queue.h>
   52 #endif
   53 #ifndef _SYS_LOCK_H_
   54 #include <sys/lock.h>
   55 #endif
   56 #ifndef _SYS_NAMECACHE_H_
   57 #include <sys/namecache.h>
   58 #endif
   59 #ifndef _SYS_STATVFS_H_
   60 #include <sys/statvfs.h>
   61 #endif
   62 #ifndef _SYS_THREAD_H_
   63 #include <sys/thread.h>
   64 #endif
   65 #include <sys/vfs_quota.h>
   66 #endif
   67 
   68 struct thread;
   69 struct journal;
   70 struct vop_ops;
   71 struct vop_mountctl_args;
   72 struct statvfs;
   73 struct vmntvnodescan_info;
   74 
   75 typedef struct fsid { int32_t val[2]; } fsid_t; /* file system id type */
   76 
   77 /*
   78  * File identifier.  These are unique per filesystem on a single machine.
   79  *
   80  * fix_ext is also used by HAMMER.
   81  */
   82 #define MAXFIDSZ        16
   83 
   84 struct fid {
   85         u_short         fid_len;                /* length of data in bytes */
   86         u_short         fid_ext;                /* extended data           */
   87         char            fid_data[MAXFIDSZ];     /* data (variable length) */
   88 };
   89 
   90 /*
   91  * file system statistics
   92  */
   93 
   94 #define MFSNAMELEN      16      /* length of fs type name, including null */
   95 #define MNAMELEN        80      /* length of buffer for returned name */
   96 
   97 struct statfs {
   98         long    f_spare2;               /* placeholder */
   99         long    f_bsize;                /* fundamental file system block size */
  100         long    f_iosize;               /* optimal transfer block size */
  101         long    f_blocks;               /* total data blocks in file system */
  102         long    f_bfree;                /* free blocks in fs */
  103         long    f_bavail;               /* free blocks avail to non-superuser */
  104         long    f_files;                /* total file nodes in file system */
  105         long    f_ffree;                /* free file nodes in fs */
  106         fsid_t  f_fsid;                 /* file system id */
  107         uid_t   f_owner;                /* user that mounted the filesystem */
  108         int     f_type;                 /* type of filesystem */
  109         int     f_flags;                /* copy of mount exported flags */
  110         long    f_syncwrites;           /* count of sync writes since mount */
  111         long    f_asyncwrites;          /* count of async writes since mount */
  112         char    f_fstypename[MFSNAMELEN]; /* fs type name */
  113         char    f_mntonname[MNAMELEN];  /* directory on which mounted */
  114         long    f_syncreads;            /* count of sync reads since mount */
  115         long    f_asyncreads;           /* count of async reads since mount */
  116         short   f_spares1;              /* unused spare */
  117         char    f_mntfromname[MNAMELEN];/* mounted filesystem */
  118         short   f_spares2;              /* unused spare */
  119         long    f_spare[2];             /* unused spare */
  120 };
  121 
  122 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  123 
  124 /*
  125  * bio_ops are associated with the mount structure and used in conjuction
  126  * with the b_dep field in a buffer.  Currently softupdates and HAMMER
  127  * utilize this field.
  128  *
  129  * All bio_ops callbacks must be MPSAFE and could be called without
  130  * the mplock.
  131  */
  132 struct buf;
  133 
  134 struct bio_ops {
  135         TAILQ_ENTRY(bio_ops) entry;
  136         void    (*io_start) (struct buf *);
  137         void    (*io_complete) (struct buf *);
  138         void    (*io_deallocate) (struct buf *);
  139         int     (*io_fsync) (struct vnode *);
  140         int     (*io_sync) (struct mount *);
  141         void    (*io_movedeps) (struct buf *, struct buf *);
  142         int     (*io_countdeps) (struct buf *, int);
  143         int     (*io_checkread) (struct buf *);
  144         int     (*io_checkwrite) (struct buf *);
  145 };
  146 
  147 #endif
  148 
  149 /*
  150  * vfs quota accounting
  151  *
  152  * uids and gids often come in contiguous blocks; use a small linear
  153  * array as the basic in-memory accounting allocation unit
  154  */
  155 #define ACCT_CHUNK_BITS 5
  156 #define ACCT_CHUNK_NIDS (1<<ACCT_CHUNK_BITS)
  157 #define ACCT_CHUNK_MASK (ACCT_CHUNK_NIDS - 1)
  158 
  159 struct ac_counters {
  160         uint64_t space;
  161         uint64_t limit;
  162 };
  163 
  164 struct ac_unode {
  165         RB_ENTRY(ac_unode)      rb_entry;
  166         uid_t                   left_bits;
  167         struct ac_counters      uid_chunk[ACCT_CHUNK_NIDS];
  168 };
  169 
  170 struct ac_gnode {
  171         RB_ENTRY(ac_gnode)      rb_entry;
  172         gid_t                   left_bits;
  173         struct ac_counters      gid_chunk[ACCT_CHUNK_NIDS];
  174 };
  175 
  176 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  177 
  178 struct vfs_acct {
  179         RB_HEAD(ac_utree,ac_unode)      ac_uroot;
  180         RB_HEAD(ac_gtree,ac_gnode)      ac_groot;
  181         uint64_t                        ac_bytes;       /* total bytes used */
  182         uint64_t                        ac_limit;
  183         struct spinlock                 ac_spin;        /* protective spinlock */
  184 };
  185 
  186 
  187 /*
  188  * Structure per mounted file system.  Each mounted file system has an
  189  * array of operations and an instance record.  The file systems are
  190  * put on a doubly linked list.
  191  *
  192  * NOTE: mnt_nvnodelist and mnt_reservedvnlist.  At the moment vnodes
  193  * are linked into mnt_nvnodelist.  At some point in the near future the
  194  * vnode list will be split into a 'dirty' and 'clean' list. mnt_nvnodelist
  195  * will become the dirty list and mnt_reservedvnlist will become the 'clean'
  196  * list.  Filesystem kld's syncing code should remain compatible since
  197  * they only need to scan the dirty vnode list (nvnodelist -> dirtyvnodelist).
  198  *
  199  * NOTE: All VFSs must at least populate mnt_vn_ops or those VOP ops that
  200  * only take namecache pointers will not be able to find their operations
  201  * vector via namecache->nc_mount.
  202  *
  203  * MPSAFE NOTES: mnt_lock interlocks mounting and unmounting operations.
  204  *
  205  *               mnt_token interlocks operations which adjust the mount
  206  *               structure and will also be held through VFS operations
  207  *               for VFSes not flagged MPSAFE.
  208  */
  209 TAILQ_HEAD(vnodelst, vnode);
  210 TAILQ_HEAD(journallst, journal);
  211 
  212 struct mount {
  213         TAILQ_ENTRY(mount) mnt_list;            /* mount list */
  214         struct vfsops   *mnt_op;                /* operations on fs */
  215         struct vfsconf  *mnt_vfc;               /* configuration info */
  216         long            mnt_namecache_gen;      /* ++ to clear negative hits */
  217         struct vnode    *mnt_syncer;            /* syncer vnode */
  218         struct syncer_ctx *mnt_syncer_ctx;      /* syncer process context */
  219         struct vnodelst mnt_nvnodelist;         /* list of vnodes this mount */
  220         TAILQ_HEAD(,vmntvnodescan_info) mnt_vnodescan_list;
  221         struct lock     mnt_lock;               /* mount structure lock */
  222         int             mnt_flag;               /* flags shared with user */
  223         int             mnt_kern_flag;          /* kernel only flags */
  224         int             mnt_maxsymlinklen;      /* max size of short symlink */
  225         struct statfs   mnt_stat;               /* cache of filesystem stats */
  226         struct statvfs  mnt_vstat;              /* extended stats */
  227         qaddr_t         mnt_data;               /* private data */
  228         time_t          mnt_time;               /* last time written*/
  229         u_int           mnt_iosize_max;         /* max IO request size */
  230         struct vnodelst mnt_reservedvnlist;     /* (future) dirty vnode list */
  231         int             mnt_nvnodelistsize;     /* # of vnodes on this mount */
  232 
  233         /*
  234          * ops vectors have a fixed stacking order.  All primary calls run
  235          * through mnt_vn_ops.  This field is typically assigned to 
  236          * mnt_vn_norm_ops.  If journaling has been enabled this field is
  237          * usually assigned to mnt_vn_journal_ops.
  238          */
  239         struct vop_ops  *mnt_vn_use_ops;        /* current ops set */
  240 
  241         struct vop_ops  *mnt_vn_coherency_ops;  /* cache coherency ops */
  242         struct vop_ops  *mnt_vn_journal_ops;    /* journaling ops */
  243         struct vop_ops  *mnt_vn_norm_ops;       /* for use by the VFS */
  244         struct vop_ops  *mnt_vn_spec_ops;       /* for use by the VFS */
  245         struct vop_ops  *mnt_vn_fifo_ops;       /* for use by the VFS */
  246         struct nchandle mnt_ncmountpt;          /* mount point */
  247         struct nchandle mnt_ncmounton;          /* mounted on */
  248         int             mnt_refs;               /* nchandle references */
  249         struct lwkt_token mnt_token;            /* token lock if not MPSAFE */
  250         struct journallst mnt_jlist;            /* list of active journals */
  251         u_int8_t        *mnt_jbitmap;           /* streamid bitmap */
  252         int16_t         mnt_streamid;           /* last streamid */
  253 
  254         struct bio_ops  *mnt_bioops;            /* BIO ops (hammer, softupd) */
  255 
  256         struct vfs_acct mnt_acct;               /* vfs space accounting */
  257 };
  258 
  259 #endif /* _KERNEL || _KERNEL_STRUCTURES */
  260 
  261 /*
  262  * User specifiable flags.
  263  */
  264 #define MNT_RDONLY      0x00000001      /* read only filesystem */
  265 #define MNT_SYNCHRONOUS 0x00000002      /* file system written synchronously */
  266 #define MNT_NOEXEC      0x00000004      /* can't exec from filesystem */
  267 #define MNT_NOSUID      0x00000008      /* don't honor setuid bits on fs */
  268 #define MNT_NODEV       0x00000010      /* don't interpret special files */
  269 #define MNT_UNION       0x00000020      /* union with underlying filesystem */
  270 #define MNT_ASYNC       0x00000040      /* file system written asynchronously */
  271 #define MNT_SUIDDIR     0x00100000      /* special handling of SUID on dirs */
  272 #define MNT_SOFTDEP     0x00200000      /* soft updates being done */
  273 #define MNT_NOSYMFOLLOW 0x00400000      /* do not follow symlinks */
  274 #define MNT_TRIM        0x01000000      /* Enable online FS trimming */
  275 #define MNT_NOATIME     0x10000000      /* disable update of file access time */
  276 #define MNT_NOCLUSTERR  0x40000000      /* disable cluster read */
  277 #define MNT_NOCLUSTERW  0x80000000      /* disable cluster write */
  278 
  279 /*
  280  * NFS export related mount flags.
  281  */
  282 #define MNT_EXRDONLY    0x00000080      /* exported read only */
  283 #define MNT_EXPORTED    0x00000100      /* file system is exported */
  284 #define MNT_DEFEXPORTED 0x00000200      /* exported to the world */
  285 #define MNT_EXPORTANON  0x00000400      /* use anon uid mapping for everyone */
  286 #define MNT_EXKERB      0x00000800      /* exported with Kerberos uid mapping */
  287 #define MNT_EXPUBLIC    0x20000000      /* public export (WebNFS) */
  288 
  289 /*
  290  * Flags set by internal operations,
  291  * but visible to the user.
  292  * XXX some of these are not quite right.. (I've never seen the root flag set)
  293  */
  294 #define MNT_LOCAL       0x00001000      /* filesystem is stored locally */
  295 #define MNT_QUOTA       0x00002000      /* quotas are enabled on filesystem */
  296 #define MNT_ROOTFS      0x00004000      /* identifies the root filesystem */
  297 #define MNT_USER        0x00008000      /* mounted by a user */
  298 #define MNT_IGNORE      0x00800000      /* do not show entry in df */
  299 
  300 /*
  301  * Mask of flags that are visible to statfs()
  302  * XXX I think that this could now become (~(MNT_CMDFLAGS))
  303  * but the 'mount' program may need changing to handle this.
  304  */
  305 #define MNT_VISFLAGMASK (MNT_RDONLY     | MNT_SYNCHRONOUS | MNT_NOEXEC  | \
  306                         MNT_NOSUID      | MNT_NODEV     | MNT_UNION     | \
  307                         MNT_ASYNC       | MNT_EXRDONLY  | MNT_EXPORTED  | \
  308                         MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB    | \
  309                         MNT_LOCAL       | MNT_USER      | MNT_QUOTA     | \
  310                         MNT_ROOTFS      | MNT_NOATIME   | MNT_NOCLUSTERR| \
  311                         MNT_NOCLUSTERW  | MNT_SUIDDIR   | MNT_SOFTDEP   | \
  312                         MNT_IGNORE      | MNT_NOSYMFOLLOW | MNT_EXPUBLIC| \
  313                         MNT_TRIM)
  314 /*
  315  * External filesystem command modifier flags.
  316  * Unmount can use the MNT_FORCE flag.
  317  * XXX These are not STATES and really should be somewhere else.
  318  */
  319 #define MNT_UPDATE      0x00010000      /* not a real mount, just an update */
  320 #define MNT_DELEXPORT   0x00020000      /* delete export host lists */
  321 #define MNT_RELOAD      0x00040000      /* reload filesystem data */
  322 #define MNT_FORCE       0x00080000      /* force unmount or readonly change */
  323 #define MNT_CMDFLAGS    (MNT_UPDATE|MNT_DELEXPORT|MNT_RELOAD|MNT_FORCE)
  324 /*
  325  * Internal filesystem control flags stored in mnt_kern_flag.
  326  *
  327  * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
  328  * past the mount point.  This keeps the subtree stable during mounts
  329  * and unmounts.
  330  *
  331  * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
  332  * dounmount() is still waiting to lock the mountpoint. This allows
  333  * the filesystem to cancel operations that might otherwise deadlock
  334  * with the unmount attempt (used by NFS).
  335  *
  336  * MNTK_NOSTKMNT prevents mounting another filesystem inside the flagged one.
  337  */
  338 #define MNTK_UNMOUNTF   0x00000001      /* forced unmount in progress */
  339 #define MNTK_MPSAFE     0x00010000      /* call vops without mnt_token lock */
  340 #define MNTK_RD_MPSAFE  0x00020000      /* vop_read is MPSAFE */
  341 #define MNTK_WR_MPSAFE  0x00040000      /* vop_write is MPSAFE */
  342 #define MNTK_GA_MPSAFE  0x00080000      /* vop_getattr is MPSAFE */
  343 #define MNTK_IN_MPSAFE  0x00100000      /* vop_inactive is MPSAFE */
  344 #define MNTK_SG_MPSAFE  0x00200000      /* vop_strategy is MPSAFE */
  345 #define MNTK_NCALIASED  0x00800000      /* namecached aliased */
  346 #define MNTK_UNMOUNT    0x01000000      /* unmount in progress */
  347 #define MNTK_MWAIT      0x02000000      /* waiting for unmount to finish */
  348 #define MNTK_WANTRDWR   0x04000000      /* upgrade to read/write requested */
  349 #define MNTK_FSMID      0x08000000      /* getattr supports FSMIDs */
  350 #define MNTK_NOSTKMNT   0x10000000      /* no stacked mount point allowed */
  351 #define MNTK_NOMSYNC    0x20000000      /* used by tmpfs */
  352 #define MNTK_THR_SYNC   0x40000000      /* fs sync thread requested */
  353 #define MNTK_ST_MPSAFE  0x80000000      /* (mfs) vfs_start is MPSAFE */
  354 
  355 #define MNTK_ALL_MPSAFE (MNTK_MPSAFE | MNTK_RD_MPSAFE | MNTK_WR_MPSAFE | \
  356                          MNTK_GA_MPSAFE | MNTK_IN_MPSAFE | MNTK_SG_MPSAFE | \
  357                          MNTK_ST_MPSAFE)
  358 
  359 /*
  360  * mountlist_*() defines
  361  */
  362 #define MNTSCAN_FORWARD         0x0001
  363 #define MNTSCAN_REVERSE         0x0002
  364 #define MNTSCAN_NOBUSY          0x0004
  365 
  366 #define MNTINS_FIRST            0x0001
  367 #define MNTINS_LAST             0x0002
  368 
  369 /*
  370  * Sysctl CTL_VFS definitions.
  371  *
  372  * Second level identifier specifies which filesystem. Second level
  373  * identifier VFS_VFSCONF returns information about all filesystems.
  374  * Second level identifier VFS_GENERIC is non-terminal.
  375  */
  376 #define VFS_VFSCONF             0       /* get configured filesystems */
  377 #define VFS_GENERIC             0       /* generic filesystem information */
  378 /*
  379  * Third level identifiers for VFS_GENERIC are given below; third
  380  * level identifiers for specific filesystems are given in their
  381  * mount specific header files.
  382  */
  383 #define VFS_MAXTYPENUM  1       /* int: highest defined filesystem type */
  384 #define VFS_CONF        2       /* struct: vfsconf for filesystem given
  385                                    as next argument */
  386 
  387 /*
  388  * VFS MPLOCK helper.
  389  */
  390 #define VFS_MPLOCK_DECLARE      int xlock_mpsafe
  391 
  392 #define VFS_MPLOCK1(mp)         VFS_MPLOCK_FLAG(mp, MNTK_MPSAFE)
  393 
  394 #define VFS_MPLOCK2(mp)                                                 \
  395                 do {                                                    \
  396                         if (xlock_mpsafe) {                             \
  397                                 get_mplock();   /* TEMPORARY */         \
  398                                 lwkt_gettoken(&mp->mnt_token);          \
  399                                 xlock_mpsafe = 0;                       \
  400                         }                                               \
  401                 } while(0)
  402 
  403 #define VFS_MPLOCK_FLAG(mp, flag)                                       \
  404                 do {                                                    \
  405                         if (mp->mnt_kern_flag & flag) {                 \
  406                                 xlock_mpsafe = 1;                       \
  407                         } else {                                        \
  408                                 get_mplock();   /* TEMPORARY */         \
  409                                 lwkt_gettoken(&mp->mnt_token);          \
  410                                 xlock_mpsafe = 0;                       \
  411                         }                                               \
  412                 } while(0)
  413 
  414 #define VFS_MPUNLOCK(mp)                                                \
  415                 do {                                                    \
  416                         if (xlock_mpsafe == 0) {                        \
  417                                 lwkt_reltoken(&mp->mnt_token);          \
  418                                 rel_mplock();   /* TEMPORARY */         \
  419                         }                                               \
  420                 } while(0)
  421 
  422 /*
  423  * Flags for various system call interfaces.
  424  *
  425  * waitfor flags to vfs_sync() and getfsstat()
  426  */
  427 #define MNT_WAIT        0x0001  /* synchronously wait for I/O to complete */
  428 #define MNT_NOWAIT      0x0002  /* start all I/O, but do not wait for it */
  429 #define MNT_LAZY        0x0004  /* be lazy and do not necessarily push it all */
  430 
  431 #define VOP_FSYNC_SYSCALL       0x0001  /* from system call */
  432 
  433 /*
  434  * Generic file handle
  435  */
  436 struct fhandle {
  437         fsid_t  fh_fsid;        /* File system id of mount point */
  438         struct  fid fh_fid;     /* File sys specific id */
  439 };
  440 typedef struct fhandle  fhandle_t;
  441 
  442 /*
  443  * Export arguments for local filesystem mount calls.
  444  */
  445 struct export_args {
  446         int     ex_flags;               /* export related flags */
  447         uid_t   ex_root;                /* mapping for root uid */
  448         struct  ucred ex_anon;          /* mapping for anonymous user */
  449         struct  sockaddr *ex_addr;      /* net address to which exported */
  450         int     ex_addrlen;             /* and the net address length */
  451         struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
  452         int     ex_masklen;             /* and the smask length */
  453         char    *ex_indexfile;          /* index file for WebNFS URLs */
  454 };
  455 
  456 /*
  457  * Structure holding information for a publicly exported filesystem
  458  * (WebNFS). Currently the specs allow just for one such filesystem.
  459  */
  460 struct nfs_public {
  461         int             np_valid;       /* Do we hold valid information */
  462         fhandle_t       np_handle;      /* Filehandle for pub fs (internal) */
  463         struct mount    *np_mount;      /* Mountpoint of exported fs */
  464         char            *np_index;      /* Index file */
  465 };
  466 
  467 /*
  468  * Filesystem configuration information. One of these exists for each
  469  * type of filesystem supported by the kernel. These are searched at
  470  * mount time to identify the requested filesystem.
  471  */
  472 #ifndef _SYS_QUEUE_H_
  473 #include <sys/queue.h>
  474 #endif
  475 struct vfsconf {
  476         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  477         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  478         int     vfc_typenum;            /* historic filesystem type number */
  479         int     vfc_refcount;           /* number mounted of this type */
  480         int     vfc_flags;              /* permanent flags */
  481         STAILQ_ENTRY(vfsconf) vfc_next; /* next in list */
  482 };
  483 
  484 struct ovfsconf {
  485         void    *vfc_vfsops;
  486         char    vfc_name[32];
  487         int     vfc_index;
  488         int     vfc_refcount;
  489         int     vfc_flags;
  490 };
  491 
  492 /*
  493  * NB: these flags refer to IMPLEMENTATION properties, not properties of
  494  * any actual mounts; i.e., it does not make sense to change the flags.
  495  */
  496 #define VFCF_STATIC     0x00010000      /* statically compiled into kernel */
  497 #define VFCF_NETWORK    0x00020000      /* may get data over the network */
  498 #define VFCF_READONLY   0x00040000      /* writes are not implemented */
  499 #define VFCF_SYNTHETIC  0x00080000      /* data does not represent real files */
  500 #define VFCF_LOOPBACK   0x00100000      /* aliases some other mounted FS */
  501 #define VFCF_UNICODE    0x00200000      /* stores file names as Unicode*/
  502 
  503 #ifdef _KERNEL
  504 
  505 #ifdef MALLOC_DECLARE
  506 MALLOC_DECLARE(M_MOUNT);
  507 #endif
  508 extern int nfs_mount_type;      /* vfc_typenum for nfs, or -1 */
  509 
  510 struct vfsconf *vfsconf_find_by_name(const char *);
  511 struct vfsconf *vfsconf_find_by_typenum(int);
  512 int vfsconf_get_maxtypenum(void);
  513 int vfsconf_each(int (*)(struct vfsconf *, void *), void *);
  514 
  515 #endif
  516 
  517 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  518 
  519 TAILQ_HEAD(mntlist, mount);     /* struct mntlist */
  520 
  521 /*
  522  * Operations supported on mounted file system.
  523  */
  524 struct nlookupdata;
  525 struct nlookupdata;
  526 struct mbuf;
  527 
  528 typedef int vfs_mount_t(struct mount *mp, char *path, caddr_t data,
  529                                     struct ucred *cred);
  530 typedef int vfs_start_t(struct mount *mp, int flags);
  531 typedef int vfs_unmount_t(struct mount *mp, int mntflags);
  532 typedef int vfs_root_t(struct mount *mp, struct vnode **vpp);
  533 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
  534                                     struct ucred *cred);
  535 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp,
  536                                     struct ucred *cred);
  537 typedef int vfs_statvfs_t(struct mount *mp, struct statvfs *sbp,
  538                                     struct ucred *cred);
  539 typedef int vfs_sync_t(struct mount *mp, int waitfor);
  540 typedef int vfs_vget_t(struct mount *mp, struct vnode *dvp,
  541                                     ino_t ino, struct vnode **vpp);
  542 typedef int vfs_fhtovp_t(struct mount *mp, struct vnode *rootvp,
  543                                     struct fid *fhp, struct vnode **vpp);
  544 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
  545                                     int *extflagsp, struct ucred **credanonp);
  546 typedef int vfs_vptofh_t(struct vnode *vp, struct fid *fhp);
  547 typedef int vfs_init_t(struct vfsconf *);
  548 typedef int vfs_uninit_t(struct vfsconf *);
  549 typedef int vfs_extattrctl_t(struct mount *mp, int cmd, struct vnode *vp,
  550                     int attrnamespace, const char *attrname,
  551                     struct ucred *cred);
  552 typedef int vfs_acinit_t(struct mount *mp);
  553 typedef void vfs_acdone_t(struct mount *mp);
  554 typedef void vfs_account_t(struct mount *mp,
  555                         uid_t uid, gid_t gid, int64_t delta);
  556 typedef void vfs_ncpgen_set_t(struct mount *mp, struct namecache *ncp);
  557 typedef int vfs_ncpgen_test_t(struct mount *mp, struct namecache *ncp);
  558 
  559 int vfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred);
  560 int vfs_start(struct mount *mp, int flags);
  561 int vfs_unmount(struct mount *mp, int mntflags);
  562 int vfs_root(struct mount *mp, struct vnode **vpp);
  563 int vfs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
  564                                 struct ucred *cred);
  565 int vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred);
  566 int vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred);
  567 int vfs_sync(struct mount *mp, int waitfor);
  568 int vfs_vget(struct mount *mp, struct vnode *dvp,
  569                                 ino_t ino, struct vnode **vpp);
  570 int vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
  571                                 struct fid *fhp, struct vnode **vpp);
  572 int vfs_checkexp(struct mount *mp, struct sockaddr *nam,
  573                                 int *extflagsp, struct ucred **credanonp);
  574 int vfs_vptofh(struct vnode *vp, struct fid *fhp);
  575 int vfs_init(struct vfsconf *vfc);
  576 int vfs_uninit(struct vfsconf *vfc, struct vfsconf *vfsp);
  577 int vfs_extattrctl(struct mount *mp, int cmd, struct vnode *vp,
  578                     int attrnamespace, const char *attrname,
  579                     struct ucred *cred);
  580 
  581 
  582 struct vfsops {
  583         vfs_mount_t     *vfs_mount;
  584         vfs_start_t     *vfs_start;
  585         vfs_unmount_t   *vfs_unmount;
  586         vfs_root_t      *vfs_root;
  587         vfs_quotactl_t  *vfs_quotactl;
  588         vfs_statfs_t    *vfs_statfs;
  589         vfs_sync_t      *vfs_sync;
  590         vfs_vget_t      *vfs_vget;
  591         vfs_fhtovp_t    *vfs_fhtovp;
  592         vfs_checkexp_t  *vfs_checkexp;
  593         vfs_vptofh_t    *vfs_vptofh;
  594         vfs_init_t      *vfs_init;
  595         vfs_uninit_t    *vfs_uninit;
  596         vfs_extattrctl_t *vfs_extattrctl;
  597         vfs_statvfs_t   *vfs_statvfs;
  598         vfs_acinit_t    *vfs_acinit;
  599         vfs_acdone_t    *vfs_acdone;
  600         vfs_account_t   *vfs_account;
  601         vfs_ncpgen_set_t        *vfs_ncpgen_set;
  602         vfs_ncpgen_test_t       *vfs_ncpgen_test;
  603 };
  604 
  605 #define VFS_MOUNT(MP, PATH, DATA, CRED)         \
  606         vfs_mount(MP, PATH, DATA, CRED)
  607 #define VFS_START(MP, FLAGS)                    \
  608         vfs_start(MP, FLAGS)
  609 #define VFS_UNMOUNT(MP, FORCE)                  \
  610         vfs_unmount(MP, FORCE)
  611 #define VFS_ROOT(MP, VPP)                       \
  612         vfs_root(MP, VPP)
  613 #define VFS_QUOTACTL(MP, C, U, A, CRED)         \
  614         vfs_quotactl(MP, C, U, A, CRED)
  615 #define VFS_STATFS(MP, SBP, CRED)               \
  616         vfs_statfs(MP, SBP, CRED)
  617 #define VFS_STATVFS(MP, SBP, CRED)              \
  618         vfs_statvfs(MP, SBP, CRED)
  619 #define VFS_SYNC(MP, WAIT)                      \
  620         vfs_sync(MP, WAIT)
  621 #define VFS_VGET(MP, DVP, INO, VPP)             \
  622         vfs_vget(MP, DVP, INO, VPP)
  623 #define VFS_FHTOVP(MP, ROOTVP, FIDP, VPP)       \
  624         vfs_fhtovp(MP, ROOTVP, FIDP, VPP)
  625 #define VFS_VPTOFH(VP, FIDP)                    \
  626         vfs_vptofh(VP, FIDP)
  627 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED)      \
  628         vfs_checkexp(MP, NAM, EXFLG, CRED)
  629 #define VFS_EXTATTRCTL(MP, C, FVP, NS, N, CRED) \
  630         vfs_extattrctl(MP, C, FVP, NS, N, CRED)
  631 #define VFS_ACCOUNT(MP, U, G, D) \
  632         if ((MP->mnt_op->vfs_account != NULL) && (D != 0)) \
  633                 MP->mnt_op->vfs_account(MP, U, G, D);
  634 #define VFS_ACINIT(MP, ERROR) \
  635         if (vfs_quota_enabled && MP->mnt_op->vfs_acinit != NULL) \
  636                 ERROR = MP->mnt_op->vfs_acinit(MP);
  637 #define VFS_ACDONE(MP) \
  638         if (vfs_quota_enabled && MP->mnt_op->vfs_acdone != NULL) \
  639                 MP->mnt_op->vfs_acdone(MP);
  640 #define VFS_NCPGEN_SET(MP, NCP) \
  641         MP->mnt_op->vfs_ncpgen_set(MP, NCP)
  642 #define VFS_NCPGEN_TEST(MP, NCP) \
  643         MP->mnt_op->vfs_ncpgen_test(MP, NCP)
  644 
  645 #endif
  646 
  647 #ifdef _KERNEL
  648 
  649 #include <sys/module.h>
  650 
  651 #define VFS_SET(vfsops, fsname, flags) \
  652         static struct vfsconf fsname ## _vfsconf = {            \
  653                 &vfsops,                                        \
  654                 #fsname,                                        \
  655                 -1,                                             \
  656                 0,                                              \
  657                 flags,                                          \
  658                 { NULL },                                       \
  659         };                                                      \
  660         static moduledata_t fsname ## _mod = {                  \
  661                 #fsname,                                        \
  662                 vfs_modevent,                                   \
  663                 & fsname ## _vfsconf                            \
  664         };                                                      \
  665         DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
  666 
  667 #endif
  668 
  669 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  670 
  671 #include <net/radix.h>
  672 
  673 #define AF_MAX          36      /* XXX */
  674 
  675 /*
  676  * Network address lookup element
  677  */
  678 struct netcred {
  679         struct  radix_node netc_rnodes[2];
  680         int     netc_exflags;
  681         struct  ucred netc_anon;
  682 };
  683 
  684 /*
  685  * Network export information
  686  */
  687 struct netexport {
  688         struct  netcred ne_defexported;               /* Default export */
  689         struct  radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */
  690 };
  691 
  692 #endif
  693 
  694 #ifdef _KERNEL
  695 
  696 extern  char *mountrootfsname;
  697 
  698 /*
  699  * exported vnode operations
  700  */
  701 int     dounmount (struct mount *, int);
  702 int     vfs_setpublicfs                     /* set publicly exported fs */
  703           (struct mount *, struct netexport *, const struct export_args *);
  704 int     vfs_lock (struct mount *);         /* lock a vfs */
  705 void    vfs_msync (struct mount *, int);
  706 void    vfs_unlock (struct mount *);       /* unlock a vfs */
  707 int     vfs_busy (struct mount *, int);
  708 int     vfs_export                          /* process mount export info */
  709           (struct mount *, struct netexport *, const struct export_args *);
  710 struct  netcred *vfs_export_lookup          /* lookup host in fs export list */
  711           (struct mount *, struct netexport *, struct sockaddr *);
  712 int     vfs_allocate_syncvnode (struct mount *);
  713 void    vfs_getnewfsid (struct mount *);
  714 int     vfs_setfsid(struct mount *mp, fsid_t *template);
  715 cdev_t  vfs_getrootfsid (struct mount *);
  716 struct  mount *vfs_getvfs (fsid_t *);      /* return vfs given fsid */
  717 int     vfs_modevent (module_t, int, void *);
  718 int     vfs_mountedon (struct vnode *);    /* is a vfs mounted on vp */
  719 int     vfs_rootmountalloc (char *, char *, struct mount **);
  720 void    vfs_unbusy (struct mount *);
  721 void    vfs_unmountall (void);
  722 int     vfs_register (struct vfsconf *);
  723 int     vfs_unregister (struct vfsconf *);
  724 extern  struct nfs_public nfs_pub;
  725 
  726 /* 
  727  * Declarations for these vfs default operations are located in 
  728  * kern/vfs_default.c, they should be used instead of making "dummy" 
  729  * functions or casting entries in the VFS op table to "enopnotsupp()".
  730  */ 
  731 vfs_start_t     vfs_stdstart;
  732 vfs_mount_t     vfs_stdmount;
  733 vfs_unmount_t   vfs_stdunmount;
  734 vfs_root_t      vfs_stdroot;
  735 vfs_quotactl_t  vfs_stdquotactl;
  736 vfs_statfs_t    vfs_stdstatfs;
  737 vfs_statvfs_t   vfs_stdstatvfs;
  738 vfs_sync_t      vfs_stdsync;
  739 vfs_sync_t      vfs_stdnosync;
  740 vfs_vget_t      vfs_stdvget;
  741 vfs_fhtovp_t    vfs_stdfhtovp;
  742 vfs_checkexp_t  vfs_stdcheckexp;
  743 vfs_vptofh_t    vfs_stdvptofh;
  744 vfs_init_t      vfs_stdinit;
  745 vfs_uninit_t    vfs_stduninit;
  746 vfs_extattrctl_t vfs_stdextattrctl;
  747 vfs_acinit_t    vfs_stdac_init;
  748 vfs_acdone_t    vfs_stdac_done;
  749 vfs_account_t   vfs_stdaccount;
  750 vfs_account_t   vfs_noaccount;
  751 vfs_ncpgen_set_t        vfs_stdncpgen_set;
  752 vfs_ncpgen_test_t       vfs_stdncpgen_test;
  753 
  754 struct vop_access_args;
  755 int vop_helper_access(struct vop_access_args *ap, uid_t ino_uid, gid_t ino_gid,
  756                         mode_t ino_mode, u_int32_t ino_flags);
  757 int vop_helper_setattr_flags(u_int32_t *ino_flags, u_int32_t vaflags,
  758                         uid_t uid, struct ucred *cred);
  759 uid_t vop_helper_create_uid(struct mount *mp, mode_t dmode, uid_t duid,
  760                         struct ucred *cred, mode_t *modep);
  761 int vop_helper_chmod(struct vnode *vp, mode_t new_mode, struct ucred *cred,
  762                         uid_t cur_uid, gid_t cur_gid, mode_t *cur_modep);
  763 int vop_helper_chown(struct vnode *vp, uid_t new_uid, gid_t new_gid,
  764                         struct ucred *cred,
  765                         uid_t *cur_uidp, gid_t *cur_gidp, mode_t *cur_modep);
  766 int vop_helper_read_shortcut(struct vop_read_args *ap);
  767 
  768 void    add_bio_ops(struct bio_ops *ops);
  769 void    rem_bio_ops(struct bio_ops *ops);
  770 
  771 int     journal_mountctl(struct vop_mountctl_args *ap);
  772 void    journal_remove_all_journals(struct mount *mp, int flags);
  773 
  774 void    mountlist_insert(struct mount *, int);
  775 int     mountlist_interlock(int (*callback)(struct mount *), struct mount *);
  776 struct mount *mountlist_boot_getfirst(void);
  777 void    mountlist_remove(struct mount *mp);
  778 int     mountlist_exists(struct mount *mp);
  779 int     mountlist_scan(int (*callback)(struct mount *, void *), void *, int);
  780 struct mount *mount_get_by_nc(struct namecache *ncp);
  781 #else /* !_KERNEL */
  782 
  783 #include <sys/cdefs.h>
  784 
  785 __BEGIN_DECLS
  786 int     fstatfs (int, struct statfs *);
  787 int     getfh (const char *, fhandle_t *);
  788 int     getfsstat (struct statfs *, long, int);
  789 int     getmntinfo (struct statfs **, int);
  790 int     getmntvinfo (struct statfs **, struct statvfs **, int);
  791 int     mount (const char *, const char *, int, void *);
  792 int     statfs (const char *, struct statfs *);
  793 int     unmount (const char *, int);
  794 int     fhopen (const struct fhandle *, int);
  795 int     fhstat (const struct fhandle *, struct stat *);
  796 int     fhstatfs (const struct fhandle *, struct statfs *);
  797 
  798 /* C library stuff */
  799 void    endvfsent (void);
  800 struct  ovfsconf *getvfsbyname (const char *);
  801 struct  ovfsconf *getvfsbytype (int);
  802 struct  ovfsconf *getvfsent (void);
  803 #define getvfsbyname    new_getvfsbyname
  804 int     new_getvfsbyname (const char *, struct vfsconf *);
  805 void    setvfsent (int);
  806 int     vfsisloadable (const char *);
  807 int     vfsload (const char *);
  808 __END_DECLS
  809 
  810 #endif /* _KERNEL */
  811 
  812 #endif /* !_SYS_MOUNT_H_ */
  813 

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