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

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    1 /*-
    2  * Copyright (c) 1989, 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  *      @(#)vnode.h     8.7 (Berkeley) 2/4/94
   30  * $FreeBSD: releng/8.2/sys/sys/vnode.h 212229 2010-09-05 14:27:55Z kib $
   31  */
   32 
   33 #ifndef _SYS_VNODE_H_
   34 #define _SYS_VNODE_H_
   35 
   36 #include <sys/bufobj.h>
   37 #include <sys/queue.h>
   38 #include <sys/lock.h>
   39 #include <sys/lockmgr.h>
   40 #include <sys/mutex.h>
   41 #include <sys/selinfo.h>
   42 #include <sys/uio.h>
   43 #include <sys/acl.h>
   44 #include <sys/ktr.h>
   45 
   46 /*
   47  * The vnode is the focus of all file activity in UNIX.  There is a
   48  * unique vnode allocated for each active file, each current directory,
   49  * each mounted-on file, text file, and the root.
   50  */
   51 
   52 /*
   53  * Vnode types.  VNON means no type.
   54  */
   55 enum vtype      { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD,
   56                   VMARKER };
   57 
   58 /*
   59  * Each underlying filesystem allocates its own private area and hangs
   60  * it from v_data.  If non-null, this area is freed in getnewvnode().
   61  */
   62 
   63 struct namecache;
   64 
   65 struct vpollinfo {
   66         struct  mtx vpi_lock;           /* lock to protect below */
   67         struct  selinfo vpi_selinfo;    /* identity of poller(s) */
   68         short   vpi_events;             /* what they are looking for */
   69         short   vpi_revents;            /* what has happened */
   70 };
   71 
   72 /*
   73  * Reading or writing any of these items requires holding the appropriate lock.
   74  *
   75  * Lock reference:
   76  *      c - namecache mutex
   77  *      f - freelist mutex
   78  *      G - Giant
   79  *      i - interlock
   80  *      m - mntvnodes mutex
   81  *      p - pollinfo lock
   82  *      s - spechash mutex
   83  *      S - syncer mutex
   84  *      u - Only a reference to the vnode is needed to read.
   85  *      v - vnode lock
   86  *
   87  * Vnodes may be found on many lists.  The general way to deal with operating
   88  * on a vnode that is on a list is:
   89  *      1) Lock the list and find the vnode.
   90  *      2) Lock interlock so that the vnode does not go away.
   91  *      3) Unlock the list to avoid lock order reversals.
   92  *      4) vget with LK_INTERLOCK and check for ENOENT, or
   93  *      5) Check for DOOMED if the vnode lock is not required.
   94  *      6) Perform your operation, then vput().
   95  */
   96 
   97 #if defined(_KERNEL) || defined(_KVM_VNODE)
   98 
   99 struct vnode {
  100         /*
  101          * Fields which define the identity of the vnode.  These fields are
  102          * owned by the filesystem (XXX: and vgone() ?)
  103          */
  104         enum    vtype v_type;                   /* u vnode type */
  105         const char *v_tag;                      /* u type of underlying data */
  106         struct  vop_vector *v_op;               /* u vnode operations vector */
  107         void    *v_data;                        /* u private data for fs */
  108 
  109         /*
  110          * Filesystem instance stuff
  111          */
  112         struct  mount *v_mount;                 /* u ptr to vfs we are in */
  113         TAILQ_ENTRY(vnode) v_nmntvnodes;        /* m vnodes for mount point */
  114 
  115         /*
  116          * Type specific fields, only one applies to any given vnode.
  117          * See #defines below for renaming to v_* namespace.
  118          */
  119         union {
  120                 struct mount    *vu_mount;      /* v ptr to mountpoint (VDIR) */
  121                 struct socket   *vu_socket;     /* v unix domain net (VSOCK) */
  122                 struct cdev     *vu_cdev;       /* v device (VCHR, VBLK) */
  123                 struct fifoinfo *vu_fifoinfo;   /* v fifo (VFIFO) */
  124                 int             vu_yield;       /*   yield count (VMARKER) */
  125         } v_un;
  126 
  127         /*
  128          * vfs_hash:  (mount + inode) -> vnode hash.
  129          */
  130         LIST_ENTRY(vnode)       v_hashlist;
  131         u_int                   v_hash;
  132 
  133         /*
  134          * VFS_namecache stuff
  135          */
  136         LIST_HEAD(, namecache) v_cache_src;     /* c Cache entries from us */
  137         TAILQ_HEAD(, namecache) v_cache_dst;    /* c Cache entries to us */
  138         struct namecache *v_cache_dd;           /* c Cache entry for .. vnode */
  139 
  140         /*
  141          * clustering stuff
  142          */
  143         daddr_t v_cstart;                       /* v start block of cluster */
  144         daddr_t v_lasta;                        /* v last allocation  */
  145         daddr_t v_lastw;                        /* v last write  */
  146         int     v_clen;                         /* v length of cur. cluster */
  147 
  148         /*
  149          * Locking
  150          */
  151         struct  lock v_lock;                    /* u (if fs don't have one) */
  152         struct  mtx v_interlock;                /* lock for "i" things */
  153         struct  lock *v_vnlock;                 /* u pointer to vnode lock */
  154         int     v_holdcnt;                      /* i prevents recycling. */
  155         int     v_usecount;                     /* i ref count of users */
  156         u_long  v_iflag;                        /* i vnode flags (see below) */
  157         u_long  v_vflag;                        /* v vnode flags */
  158         int     v_writecount;                   /* v ref count of writers */
  159 
  160         /*
  161          * The machinery of being a vnode
  162          */
  163         TAILQ_ENTRY(vnode) v_freelist;          /* f vnode freelist */
  164         struct bufobj   v_bufobj;               /* * Buffer cache object */
  165 
  166         /*
  167          * Hooks for various subsystems and features.
  168          */
  169         struct vpollinfo *v_pollinfo;           /* G Poll events, p for *v_pi */
  170         struct label *v_label;                  /* MAC label for vnode */
  171         struct lockf *v_lockf;                  /* Byte-level lock list */
  172 };
  173 
  174 #endif /* defined(_KERNEL) || defined(_KVM_VNODE) */
  175 
  176 #define v_mountedhere   v_un.vu_mount
  177 #define v_socket        v_un.vu_socket
  178 #define v_rdev          v_un.vu_cdev
  179 #define v_fifoinfo      v_un.vu_fifoinfo
  180 #define v_yield         v_un.vu_yield
  181 
  182 /* XXX: These are temporary to avoid a source sweep at this time */
  183 #define v_object        v_bufobj.bo_object
  184 
  185 /*
  186  * Userland version of struct vnode, for sysctl.
  187  */
  188 struct xvnode {
  189         size_t  xv_size;                        /* sizeof(struct xvnode) */
  190         void    *xv_vnode;                      /* address of real vnode */
  191         u_long  xv_flag;                        /* vnode vflags */
  192         int     xv_usecount;                    /* reference count of users */
  193         int     xv_writecount;                  /* reference count of writers */
  194         int     xv_holdcnt;                     /* page & buffer references */
  195         u_long  xv_id;                          /* capability identifier */
  196         void    *xv_mount;                      /* address of parent mount */
  197         long    xv_numoutput;                   /* num of writes in progress */
  198         enum    vtype xv_type;                  /* vnode type */
  199         union {
  200                 void    *xvu_socket;            /* socket, if VSOCK */
  201                 void    *xvu_fifo;              /* fifo, if VFIFO */
  202                 dev_t   xvu_rdev;               /* maj/min, if VBLK/VCHR */
  203                 struct {
  204                         dev_t   xvu_dev;        /* device, if VDIR/VREG/VLNK */
  205                         ino_t   xvu_ino;        /* id, if VDIR/VREG/VLNK */
  206                 } xv_uns;
  207         } xv_un;
  208 };
  209 #define xv_socket       xv_un.xvu_socket
  210 #define xv_fifo         xv_un.xvu_fifo
  211 #define xv_rdev         xv_un.xvu_rdev
  212 #define xv_dev          xv_un.xv_uns.xvu_dev
  213 #define xv_ino          xv_un.xv_uns.xvu_ino
  214 
  215 /* We don't need to lock the knlist */
  216 #define VN_KNLIST_EMPTY(vp) ((vp)->v_pollinfo == NULL ||        \
  217             KNLIST_EMPTY(&(vp)->v_pollinfo->vpi_selinfo.si_note))
  218 
  219 #define VN_KNOTE(vp, b, a)                                      \
  220         do {                                                    \
  221                 if (!VN_KNLIST_EMPTY(vp))                       \
  222                         KNOTE(&vp->v_pollinfo->vpi_selinfo.si_note, (b), \
  223                             (a) | KNF_NOKQLOCK);                \
  224         } while (0)
  225 #define VN_KNOTE_LOCKED(vp, b)          VN_KNOTE(vp, b, KNF_LISTLOCKED)
  226 #define VN_KNOTE_UNLOCKED(vp, b)        VN_KNOTE(vp, b, 0)
  227 
  228 /*
  229  * Vnode flags.
  230  *      VI flags are protected by interlock and live in v_iflag
  231  *      VV flags are protected by the vnode lock and live in v_vflag
  232  *
  233  *      VI_DOOMED is doubly protected by the interlock and vnode lock.  Both
  234  *      are required for writing but the status may be checked with either.
  235  */
  236 #define VI_MOUNT        0x0020  /* Mount in progress */
  237 #define VI_AGE          0x0040  /* Insert vnode at head of free list */
  238 #define VI_DOOMED       0x0080  /* This vnode is being recycled */
  239 #define VI_FREE         0x0100  /* This vnode is on the freelist */
  240 #define VI_DOINGINACT   0x0800  /* VOP_INACTIVE is in progress */
  241 #define VI_OWEINACT     0x1000  /* Need to call inactive */
  242 
  243 #define VV_ROOT         0x0001  /* root of its filesystem */
  244 #define VV_ISTTY        0x0002  /* vnode represents a tty */
  245 #define VV_NOSYNC       0x0004  /* unlinked, stop syncing */
  246 #define VV_ETERNALDEV   0x0008  /* device that is never destroyed */
  247 #define VV_CACHEDLABEL  0x0010  /* Vnode has valid cached MAC label */
  248 #define VV_TEXT         0x0020  /* vnode is a pure text prototype */
  249 #define VV_COPYONWRITE  0x0040  /* vnode is doing copy-on-write */
  250 #define VV_SYSTEM       0x0080  /* vnode being used by kernel */
  251 #define VV_PROCDEP      0x0100  /* vnode is process dependent */
  252 #define VV_NOKNOTE      0x0200  /* don't activate knotes on this vnode */
  253 #define VV_DELETED      0x0400  /* should be removed */
  254 #define VV_MD           0x0800  /* vnode backs the md device */
  255 #define VV_FORCEINSMQ   0x1000  /* force the insmntque to succeed */
  256 
  257 /*
  258  * Vnode attributes.  A field value of VNOVAL represents a field whose value
  259  * is unavailable (getattr) or which is not to be changed (setattr).
  260  */
  261 struct vattr {
  262         enum vtype      va_type;        /* vnode type (for create) */
  263         u_short         va_mode;        /* files access mode and type */
  264         short           va_nlink;       /* number of references to file */
  265         uid_t           va_uid;         /* owner user id */
  266         gid_t           va_gid;         /* owner group id */
  267         dev_t           va_fsid;        /* filesystem id */
  268         long            va_fileid;      /* file id */
  269         u_quad_t        va_size;        /* file size in bytes */
  270         long            va_blocksize;   /* blocksize preferred for i/o */
  271         struct timespec va_atime;       /* time of last access */
  272         struct timespec va_mtime;       /* time of last modification */
  273         struct timespec va_ctime;       /* time file changed */
  274         struct timespec va_birthtime;   /* time file created */
  275         u_long          va_gen;         /* generation number of file */
  276         u_long          va_flags;       /* flags defined for file */
  277         dev_t           va_rdev;        /* device the special file represents */
  278         u_quad_t        va_bytes;       /* bytes of disk space held by file */
  279         u_quad_t        va_filerev;     /* file modification number */
  280         u_int           va_vaflags;     /* operations flags, see below */
  281         long            va_spare;       /* remain quad aligned */
  282 };
  283 
  284 /*
  285  * Flags for va_vaflags.
  286  */
  287 #define VA_UTIMES_NULL  0x01            /* utimes argument was NULL */
  288 #define VA_EXCLUSIVE    0x02            /* exclusive create request */
  289 
  290 /*
  291  * Flags for ioflag. (high 16 bits used to ask for read-ahead and
  292  * help with write clustering)
  293  * NB: IO_NDELAY and IO_DIRECT are linked to fcntl.h
  294  */
  295 #define IO_UNIT         0x0001          /* do I/O as atomic unit */
  296 #define IO_APPEND       0x0002          /* append write to end */
  297 #define IO_NDELAY       0x0004          /* FNDELAY flag set in file table */
  298 #define IO_NODELOCKED   0x0008          /* underlying node already locked */
  299 #define IO_ASYNC        0x0010          /* bawrite rather then bdwrite */
  300 #define IO_VMIO         0x0020          /* data already in VMIO space */
  301 #define IO_INVAL        0x0040          /* invalidate after I/O */
  302 #define IO_SYNC         0x0080          /* do I/O synchronously */
  303 #define IO_DIRECT       0x0100          /* attempt to bypass buffer cache */
  304 #define IO_EXT          0x0400          /* operate on external attributes */
  305 #define IO_NORMAL       0x0800          /* operate on regular data */
  306 #define IO_NOMACCHECK   0x1000          /* MAC checks unnecessary */
  307 
  308 #define IO_SEQMAX       0x7F            /* seq heuristic max value */
  309 #define IO_SEQSHIFT     16              /* seq heuristic in upper 16 bits */
  310 
  311 /*
  312  * Flags for accmode_t.
  313  */
  314 #define VEXEC                   000000000100 /* execute/search permission */
  315 #define VWRITE                  000000000200 /* write permission */
  316 #define VREAD                   000000000400 /* read permission */
  317 #define VADMIN                  000000010000 /* being the file owner */
  318 #define VAPPEND                 000000040000 /* permission to write/append */
  319 /*
  320  * VEXPLICIT_DENY makes VOP_ACCESSX(9) return EPERM or EACCES only
  321  * if permission was denied explicitly, by a "deny" rule in NFSv4 ACL,
  322  * and 0 otherwise.  This never happens with ordinary unix access rights
  323  * or POSIX.1e ACLs.  Obviously, VEXPLICIT_DENY must be OR-ed with
  324  * some other V* constant.
  325  */
  326 #define VEXPLICIT_DENY          000000100000
  327 #define VREAD_NAMED_ATTRS       000000200000 /* not used */
  328 #define VWRITE_NAMED_ATTRS      000000400000 /* not used */
  329 #define VDELETE_CHILD           000001000000
  330 #define VREAD_ATTRIBUTES        000002000000 /* permission to stat(2) */
  331 #define VWRITE_ATTRIBUTES       000004000000 /* change {m,c,a}time */
  332 #define VDELETE                 000010000000
  333 #define VREAD_ACL               000020000000 /* read ACL and file mode */
  334 #define VWRITE_ACL              000040000000 /* change ACL and/or file mode */
  335 #define VWRITE_OWNER            000100000000 /* change file owner */
  336 #define VSYNCHRONIZE            000200000000 /* not used */
  337 
  338 /*
  339  * Permissions that were traditionally granted only to the file owner.
  340  */
  341 #define VADMIN_PERMS    (VADMIN | VWRITE_ATTRIBUTES | VWRITE_ACL | \
  342     VWRITE_OWNER)
  343 
  344 /*
  345  * Permissions that were traditionally granted to everyone.
  346  */
  347 #define VSTAT_PERMS     (VREAD_ATTRIBUTES | VREAD_ACL)
  348 
  349 /*
  350  * Permissions that allow to change the state of the file in any way.
  351  */
  352 #define VMODIFY_PERMS   (VWRITE | VAPPEND | VADMIN_PERMS | VDELETE_CHILD | \
  353     VDELETE)
  354 
  355 /*
  356  * Token indicating no attribute value yet assigned.
  357  */
  358 #define VNOVAL  (-1)
  359 
  360 /*
  361  * LK_TIMELOCK timeout for vnode locks (used mainly by the pageout daemon)
  362  */
  363 #define VLKTIMEOUT      (hz / 20 + 1)
  364 
  365 #ifdef _KERNEL
  366 
  367 #ifdef MALLOC_DECLARE
  368 MALLOC_DECLARE(M_VNODE);
  369 #endif
  370 
  371 /*
  372  * Convert between vnode types and inode formats (since POSIX.1
  373  * defines mode word of stat structure in terms of inode formats).
  374  */
  375 extern enum vtype       iftovt_tab[];
  376 extern int              vttoif_tab[];
  377 #define IFTOVT(mode)    (iftovt_tab[((mode) & S_IFMT) >> 12])
  378 #define VTTOIF(indx)    (vttoif_tab[(int)(indx)])
  379 #define MAKEIMODE(indx, mode)   (int)(VTTOIF(indx) | (mode))
  380 
  381 /*
  382  * Flags to various vnode functions.
  383  */
  384 #define SKIPSYSTEM      0x0001  /* vflush: skip vnodes marked VSYSTEM */
  385 #define FORCECLOSE      0x0002  /* vflush: force file closure */
  386 #define WRITECLOSE      0x0004  /* vflush: only close writable files */
  387 #define DOCLOSE         0x0008  /* vclean: close active files */
  388 #define V_SAVE          0x0001  /* vinvalbuf: sync file first */
  389 #define V_ALT           0x0002  /* vinvalbuf: invalidate only alternate bufs */
  390 #define V_NORMAL        0x0004  /* vinvalbuf: invalidate only regular bufs */
  391 #define REVOKEALL       0x0001  /* vop_revoke: revoke all aliases */
  392 #define V_WAIT          0x0001  /* vn_start_write: sleep for suspend */
  393 #define V_NOWAIT        0x0002  /* vn_start_write: don't sleep for suspend */
  394 #define V_XSLEEP        0x0004  /* vn_start_write: just return after sleep */
  395 
  396 #define VREF(vp)        vref(vp)
  397 
  398 #ifdef DIAGNOSTIC
  399 #define VATTR_NULL(vap) vattr_null(vap)
  400 #else
  401 #define VATTR_NULL(vap) (*(vap) = va_null)      /* initialize a vattr */
  402 #endif /* DIAGNOSTIC */
  403 
  404 #define NULLVP  ((struct vnode *)NULL)
  405 
  406 /*
  407  * Global vnode data.
  408  */
  409 extern  struct vnode *rootvnode;        /* root (i.e. "/") vnode */
  410 extern  int async_io_version;           /* 0 or POSIX version of AIO i'face */
  411 extern  int desiredvnodes;              /* number of vnodes desired */
  412 extern  struct uma_zone *namei_zone;
  413 extern  int prtactive;                  /* nonzero to call vprint() */
  414 extern  struct vattr va_null;           /* predefined null vattr structure */
  415 
  416 #define VI_LOCK(vp)     mtx_lock(&(vp)->v_interlock)
  417 #define VI_LOCK_FLAGS(vp, flags) mtx_lock_flags(&(vp)->v_interlock, (flags))
  418 #define VI_TRYLOCK(vp)  mtx_trylock(&(vp)->v_interlock)
  419 #define VI_UNLOCK(vp)   mtx_unlock(&(vp)->v_interlock)
  420 #define VI_MTX(vp)      (&(vp)->v_interlock)
  421 
  422 #define VN_LOCK_AREC(vp)                                                \
  423         ((vp)->v_vnlock->lock_object.lo_flags |= LO_RECURSABLE)
  424 #define VN_LOCK_ASHARE(vp)                                              \
  425         ((vp)->v_vnlock->lock_object.lo_flags &= ~LK_NOSHARE)
  426 
  427 #endif /* _KERNEL */
  428 
  429 /*
  430  * Mods for extensibility.
  431  */
  432 
  433 /*
  434  * Flags for vdesc_flags:
  435  */
  436 #define VDESC_MAX_VPS           16
  437 /* Low order 16 flag bits are reserved for willrele flags for vp arguments. */
  438 #define VDESC_VP0_WILLRELE      0x0001
  439 #define VDESC_VP1_WILLRELE      0x0002
  440 #define VDESC_VP2_WILLRELE      0x0004
  441 #define VDESC_VP3_WILLRELE      0x0008
  442 #define VDESC_NOMAP_VPP         0x0100
  443 #define VDESC_VPP_WILLRELE      0x0200
  444 
  445 /*
  446  * A generic structure.
  447  * This can be used by bypass routines to identify generic arguments.
  448  */
  449 struct vop_generic_args {
  450         struct vnodeop_desc *a_desc;
  451         /* other random data follows, presumably */
  452 };
  453 
  454 typedef int vop_bypass_t(struct vop_generic_args *);
  455 
  456 /*
  457  * VDESC_NO_OFFSET is used to identify the end of the offset list
  458  * and in places where no such field exists.
  459  */
  460 #define VDESC_NO_OFFSET -1
  461 
  462 /*
  463  * This structure describes the vnode operation taking place.
  464  */
  465 struct vnodeop_desc {
  466         char    *vdesc_name;            /* a readable name for debugging */
  467         int      vdesc_flags;           /* VDESC_* flags */
  468         vop_bypass_t    *vdesc_call;    /* Function to call */
  469 
  470         /*
  471          * These ops are used by bypass routines to map and locate arguments.
  472          * Creds and procs are not needed in bypass routines, but sometimes
  473          * they are useful to (for example) transport layers.
  474          * Nameidata is useful because it has a cred in it.
  475          */
  476         int     *vdesc_vp_offsets;      /* list ended by VDESC_NO_OFFSET */
  477         int     vdesc_vpp_offset;       /* return vpp location */
  478         int     vdesc_cred_offset;      /* cred location, if any */
  479         int     vdesc_thread_offset;    /* thread location, if any */
  480         int     vdesc_componentname_offset; /* if any */
  481 };
  482 
  483 #ifdef _KERNEL
  484 /*
  485  * A list of all the operation descs.
  486  */
  487 extern struct vnodeop_desc *vnodeop_descs[];
  488 
  489 #define VOPARG_OFFSETOF(s_type, field)  __offsetof(s_type, field)
  490 #define VOPARG_OFFSETTO(s_type, s_offset, struct_p) \
  491     ((s_type)(((char*)(struct_p)) + (s_offset)))
  492 
  493 
  494 #ifdef DEBUG_VFS_LOCKS
  495 /*
  496  * Support code to aid in debugging VFS locking problems.  Not totally
  497  * reliable since if the thread sleeps between changing the lock
  498  * state and checking it with the assert, some other thread could
  499  * change the state.  They are good enough for debugging a single
  500  * filesystem using a single-threaded test.
  501  */
  502 void    assert_vi_locked(struct vnode *vp, const char *str);
  503 void    assert_vi_unlocked(struct vnode *vp, const char *str);
  504 void    assert_vop_elocked(struct vnode *vp, const char *str);
  505 #if 0
  506 void    assert_vop_elocked_other(struct vnode *vp, const char *str);
  507 #endif
  508 void    assert_vop_locked(struct vnode *vp, const char *str);
  509 #if 0
  510 voi0    assert_vop_slocked(struct vnode *vp, const char *str);
  511 #endif
  512 void    assert_vop_unlocked(struct vnode *vp, const char *str);
  513 
  514 #define ASSERT_VI_LOCKED(vp, str)       assert_vi_locked((vp), (str))
  515 #define ASSERT_VI_UNLOCKED(vp, str)     assert_vi_unlocked((vp), (str))
  516 #define ASSERT_VOP_ELOCKED(vp, str)     assert_vop_elocked((vp), (str))
  517 #if 0
  518 #define ASSERT_VOP_ELOCKED_OTHER(vp, str) assert_vop_locked_other((vp), (str))
  519 #endif
  520 #define ASSERT_VOP_LOCKED(vp, str)      assert_vop_locked((vp), (str))
  521 #if 0
  522 #define ASSERT_VOP_SLOCKED(vp, str)     assert_vop_slocked((vp), (str))
  523 #endif
  524 #define ASSERT_VOP_UNLOCKED(vp, str)    assert_vop_unlocked((vp), (str))
  525 
  526 #else /* !DEBUG_VFS_LOCKS */
  527 
  528 #define ASSERT_VI_LOCKED(vp, str)       ((void)0)
  529 #define ASSERT_VI_UNLOCKED(vp, str)     ((void)0)
  530 #define ASSERT_VOP_ELOCKED(vp, str)     ((void)0)
  531 #if 0
  532 #define ASSERT_VOP_ELOCKED_OTHER(vp, str)
  533 #endif
  534 #define ASSERT_VOP_LOCKED(vp, str)      ((void)0)
  535 #if 0
  536 #define ASSERT_VOP_SLOCKED(vp, str)
  537 #endif
  538 #define ASSERT_VOP_UNLOCKED(vp, str)    ((void)0)
  539 #endif /* DEBUG_VFS_LOCKS */
  540 
  541 
  542 /*
  543  * This call works for vnodes in the kernel.
  544  */
  545 #define VCALL(c) ((c)->a_desc->vdesc_call(c))
  546 
  547 /*
  548  * VMIO support inline
  549  */
  550 
  551 extern int vmiodirenable;
  552 
  553 static __inline int
  554 vn_canvmio(struct vnode *vp)
  555 {
  556       if (vp && (vp->v_type == VREG || (vmiodirenable && vp->v_type == VDIR)))
  557                 return(TRUE);
  558         return(FALSE);
  559 }
  560 
  561 /*
  562  * Finally, include the default set of vnode operations.
  563  */
  564 #include "vnode_if.h"
  565 
  566 /* vn_open_flags */
  567 #define VN_OPEN_NOAUDIT         0x00000001
  568 
  569 /*
  570  * Public vnode manipulation functions.
  571  */
  572 struct componentname;
  573 struct file;
  574 struct mount;
  575 struct nameidata;
  576 struct ostat;
  577 struct thread;
  578 struct proc;
  579 struct stat;
  580 struct nstat;
  581 struct ucred;
  582 struct uio;
  583 struct vattr;
  584 struct vnode;
  585 
  586 /* cache_* may belong in namei.h. */
  587 void    cache_enter(struct vnode *dvp, struct vnode *vp,
  588             struct componentname *cnp);
  589 int     cache_lookup(struct vnode *dvp, struct vnode **vpp,
  590             struct componentname *cnp);
  591 void    cache_purge(struct vnode *vp);
  592 void    cache_purge_negative(struct vnode *vp);
  593 void    cache_purgevfs(struct mount *mp);
  594 int     change_dir(struct vnode *vp, struct thread *td);
  595 int     change_root(struct vnode *vp, struct thread *td);
  596 void    cvtstat(struct stat *st, struct ostat *ost);
  597 void    cvtnstat(struct stat *sb, struct nstat *nsb);
  598 int     getnewvnode(const char *tag, struct mount *mp, struct vop_vector *vops,
  599             struct vnode **vpp);
  600 int     insmntque1(struct vnode *vp, struct mount *mp,
  601             void (*dtr)(struct vnode *, void *), void *dtr_arg);
  602 int     insmntque(struct vnode *vp, struct mount *mp);
  603 u_quad_t init_va_filerev(void);
  604 int     speedup_syncer(void);
  605 int     vn_vptocnp(struct vnode **vp, struct ucred *cred, char *buf,
  606             u_int *buflen);
  607 #define textvp_fullpath(p, rb, rfb) \
  608         vn_fullpath(FIRST_THREAD_IN_PROC(p), (p)->p_textvp, rb, rfb)
  609 int     vn_fullpath(struct thread *td, struct vnode *vn,
  610             char **retbuf, char **freebuf);
  611 int     vn_fullpath_global(struct thread *td, struct vnode *vn,
  612             char **retbuf, char **freebuf);
  613 int     vn_commname(struct vnode *vn, char *buf, u_int buflen);
  614 int     vaccess(enum vtype type, mode_t file_mode, uid_t file_uid,
  615             gid_t file_gid, accmode_t accmode, struct ucred *cred,
  616             int *privused);
  617 int     vaccess_acl_nfs4(enum vtype type, uid_t file_uid, gid_t file_gid,
  618             struct acl *aclp, accmode_t accmode, struct ucred *cred,
  619             int *privused);
  620 int     vaccess_acl_posix1e(enum vtype type, uid_t file_uid,
  621             gid_t file_gid, struct acl *acl, accmode_t accmode,
  622             struct ucred *cred, int *privused);
  623 void    vattr_null(struct vattr *vap);
  624 int     vcount(struct vnode *vp);
  625 void    vdrop(struct vnode *);
  626 void    vdropl(struct vnode *);
  627 void    vdestroy(struct vnode *);
  628 int     vflush(struct mount *mp, int rootrefs, int flags, struct thread *td);
  629 int     vget(struct vnode *vp, int lockflag, struct thread *td);
  630 void    vgone(struct vnode *vp);
  631 void    vhold(struct vnode *);
  632 void    vholdl(struct vnode *);
  633 int     vinvalbuf(struct vnode *vp, int save, int slpflag, int slptimeo);
  634 int     vtruncbuf(struct vnode *vp, struct ucred *cred, struct thread *td,
  635             off_t length, int blksize);
  636 void    vunref(struct vnode *);
  637 void    vn_printf(struct vnode *vp, const char *fmt, ...) __printflike(2,3);
  638 #define vprint(label, vp) vn_printf((vp), "%s\n", (label))
  639 int     vrecycle(struct vnode *vp, struct thread *td);
  640 int     vn_close(struct vnode *vp,
  641             int flags, struct ucred *file_cred, struct thread *td);
  642 void    vn_finished_write(struct mount *mp);
  643 void    vn_finished_secondary_write(struct mount *mp);
  644 int     vn_isdisk(struct vnode *vp, int *errp);
  645 int     _vn_lock(struct vnode *vp, int flags, char *file, int line);
  646 #define vn_lock(vp, flags) _vn_lock(vp, flags, __FILE__, __LINE__)
  647 int     vn_open(struct nameidata *ndp, int *flagp, int cmode, struct file *fp);
  648 int     vn_open_cred(struct nameidata *ndp, int *flagp, int cmode,
  649             u_int vn_open_flags, struct ucred *cred, struct file *fp);
  650 int     vn_pollrecord(struct vnode *vp, struct thread *p, int events);
  651 int     vn_rdwr(enum uio_rw rw, struct vnode *vp, void *base,
  652             int len, off_t offset, enum uio_seg segflg, int ioflg,
  653             struct ucred *active_cred, struct ucred *file_cred, int *aresid,
  654             struct thread *td);
  655 int     vn_rdwr_inchunks(enum uio_rw rw, struct vnode *vp, void *base,
  656             size_t len, off_t offset, enum uio_seg segflg, int ioflg,
  657             struct ucred *active_cred, struct ucred *file_cred, size_t *aresid,
  658             struct thread *td);
  659 int     vn_stat(struct vnode *vp, struct stat *sb, struct ucred *active_cred,
  660             struct ucred *file_cred, struct thread *td);
  661 int     vn_start_write(struct vnode *vp, struct mount **mpp, int flags);
  662 int     vn_start_secondary_write(struct vnode *vp, struct mount **mpp,
  663             int flags);
  664 int     vn_writechk(struct vnode *vp);
  665 int     vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace,
  666             const char *attrname, int *buflen, char *buf, struct thread *td);
  667 int     vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace,
  668             const char *attrname, int buflen, char *buf, struct thread *td);
  669 int     vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace,
  670             const char *attrname, struct thread *td);
  671 int     vn_vget_ino(struct vnode *vp, ino_t ino, int lkflags,
  672             struct vnode **rvp);
  673 
  674 int     vfs_cache_lookup(struct vop_lookup_args *ap);
  675 void    vfs_timestamp(struct timespec *);
  676 void    vfs_write_resume(struct mount *mp);
  677 int     vfs_write_suspend(struct mount *mp);
  678 int     vop_stdbmap(struct vop_bmap_args *);
  679 int     vop_stdfsync(struct vop_fsync_args *);
  680 int     vop_stdgetwritemount(struct vop_getwritemount_args *);
  681 int     vop_stdgetpages(struct vop_getpages_args *);
  682 int     vop_stdinactive(struct vop_inactive_args *);
  683 int     vop_stdislocked(struct vop_islocked_args *);
  684 int     vop_stdkqfilter(struct vop_kqfilter_args *);
  685 int     vop_stdlock(struct vop_lock1_args *);
  686 int     vop_stdputpages(struct vop_putpages_args *);
  687 int     vop_stdunlock(struct vop_unlock_args *);
  688 int     vop_nopoll(struct vop_poll_args *);
  689 int     vop_stdaccess(struct vop_access_args *ap);
  690 int     vop_stdaccessx(struct vop_accessx_args *ap);
  691 int     vop_stdadvlock(struct vop_advlock_args *ap);
  692 int     vop_stdadvlockasync(struct vop_advlockasync_args *ap);
  693 int     vop_stdpathconf(struct vop_pathconf_args *);
  694 int     vop_stdpoll(struct vop_poll_args *);
  695 int     vop_stdvptocnp(struct vop_vptocnp_args *ap);
  696 int     vop_stdvptofh(struct vop_vptofh_args *ap);
  697 int     vop_eopnotsupp(struct vop_generic_args *ap);
  698 int     vop_ebadf(struct vop_generic_args *ap);
  699 int     vop_einval(struct vop_generic_args *ap);
  700 int     vop_enoent(struct vop_generic_args *ap);
  701 int     vop_enotty(struct vop_generic_args *ap);
  702 int     vop_null(struct vop_generic_args *ap);
  703 int     vop_panic(struct vop_generic_args *ap);
  704 
  705 /* These are called from within the actual VOPS. */
  706 void    vop_create_post(void *a, int rc);
  707 void    vop_link_post(void *a, int rc);
  708 void    vop_lock_pre(void *a);
  709 void    vop_lock_post(void *a, int rc);
  710 void    vop_lookup_post(void *a, int rc);
  711 void    vop_lookup_pre(void *a);
  712 void    vop_mkdir_post(void *a, int rc);
  713 void    vop_mknod_post(void *a, int rc);
  714 void    vop_remove_post(void *a, int rc);
  715 void    vop_rename_post(void *a, int rc);
  716 void    vop_rename_pre(void *a);
  717 void    vop_rmdir_post(void *a, int rc);
  718 void    vop_setattr_post(void *a, int rc);
  719 void    vop_strategy_pre(void *a);
  720 void    vop_symlink_post(void *a, int rc);
  721 void    vop_unlock_post(void *a, int rc);
  722 void    vop_unlock_pre(void *a);
  723 
  724 void    vop_rename_fail(struct vop_rename_args *ap);
  725 
  726 #define VOP_WRITE_PRE(ap)                                               \
  727         struct vattr va;                                                \
  728         int error, osize, ooffset, noffset;                             \
  729                                                                         \
  730         osize = ooffset = noffset = 0;                                  \
  731         if (!VN_KNLIST_EMPTY((ap)->a_vp)) {                             \
  732                 error = VOP_GETATTR((ap)->a_vp, &va, (ap)->a_cred);     \
  733                 if (error)                                              \
  734                         return (error);                                 \
  735                 ooffset = (ap)->a_uio->uio_offset;                      \
  736                 osize = va.va_size;                                     \
  737         }
  738 
  739 #define VOP_WRITE_POST(ap, ret)                                         \
  740         noffset = (ap)->a_uio->uio_offset;                              \
  741         if (noffset > ooffset && !VN_KNLIST_EMPTY((ap)->a_vp)) {        \
  742                 VFS_KNOTE_LOCKED((ap)->a_vp, NOTE_WRITE                 \
  743                     | (noffset > osize ? NOTE_EXTEND : 0));             \
  744         }
  745 
  746 #define VOP_LOCK(vp, flags) VOP_LOCK1(vp, flags, __FILE__, __LINE__)
  747 
  748 
  749 void    vput(struct vnode *vp);
  750 void    vrele(struct vnode *vp);
  751 void    vref(struct vnode *vp);
  752 int     vrefcnt(struct vnode *vp);
  753 void    v_addpollinfo(struct vnode *vp);
  754 
  755 int vnode_create_vobject(struct vnode *vp, off_t size, struct thread *td);
  756 void vnode_destroy_vobject(struct vnode *vp);
  757 
  758 extern struct vop_vector fifo_specops;
  759 extern struct vop_vector dead_vnodeops;
  760 extern struct vop_vector default_vnodeops;
  761 
  762 #define VOP_PANIC       ((void*)(uintptr_t)vop_panic)
  763 #define VOP_NULL        ((void*)(uintptr_t)vop_null)
  764 #define VOP_EBADF       ((void*)(uintptr_t)vop_ebadf)
  765 #define VOP_ENOTTY      ((void*)(uintptr_t)vop_enotty)
  766 #define VOP_EINVAL      ((void*)(uintptr_t)vop_einval)
  767 #define VOP_ENOENT      ((void*)(uintptr_t)vop_enoent)
  768 #define VOP_EOPNOTSUPP  ((void*)(uintptr_t)vop_eopnotsupp)
  769 
  770 /* vfs_hash.c */
  771 typedef int vfs_hash_cmp_t(struct vnode *vp, void *arg);
  772 
  773 int vfs_hash_get(const struct mount *mp, u_int hash, int flags, struct thread *td, struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg);
  774 int vfs_hash_insert(struct vnode *vp, u_int hash, int flags, struct thread *td, struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg);
  775 void vfs_hash_rehash(struct vnode *vp, u_int hash);
  776 void vfs_hash_remove(struct vnode *vp);
  777 
  778 int vfs_kqfilter(struct vop_kqfilter_args *);
  779 void vfs_mark_atime(struct vnode *vp, struct ucred *cred);
  780 struct dirent;
  781 int vfs_read_dirent(struct vop_readdir_args *ap, struct dirent *dp, off_t off);
  782 
  783 int     vfs_unixify_accmode(accmode_t *accmode);
  784 
  785 #endif /* _KERNEL */
  786 
  787 #endif /* !_SYS_VNODE_H_ */

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