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34 * @(#)vfs_vnops.c 8.2 (Berkeley) 1/21/94
35 * $FreeBSD: src/sys/kern/vfs_vnops.c,v 1.87.2.13 2002/12/29 18:19:53 dillon Exp $
38 #include <sys/param.h>
39 #include <sys/systm.h>
41 #include <sys/fcntl.h>
46 #include <sys/mount.h>
47 #include <sys/nlookup.h>
48 #include <sys/vnode.h>
50 #include <sys/filio.h>
51 #include <sys/ttycom.h>
53 #include <sys/sysctl.h>
54 #include <sys/syslog.h>
56 #include <sys/mplock2.h>
58 static int vn_closefile (struct file *fp);
59 static int vn_ioctl (struct file *fp, u_long com, caddr_t data,
60 struct ucred *cred, struct sysmsg *msg);
61 static int vn_read (struct file *fp, struct uio *uio,
62 struct ucred *cred, int flags);
63 static int vn_kqfilter (struct file *fp, struct knote *kn);
64 static int vn_statfile (struct file *fp, struct stat *sb, struct ucred *cred);
65 static int vn_write (struct file *fp, struct uio *uio,
66 struct ucred *cred, int flags);
68 struct fileops vnode_fileops = {
72 .fo_kqfilter = vn_kqfilter,
73 .fo_stat = vn_statfile,
74 .fo_close = vn_closefile,
75 .fo_shutdown = nofo_shutdown
79 * Common code for vnode open operations. Check permissions, and call
80 * the VOP_NOPEN or VOP_NCREATE routine.
82 * The caller is responsible for setting up nd with nlookup_init() and
83 * for cleaning it up with nlookup_done(), whether we return an error
86 * On success nd->nl_open_vp will hold a referenced and, if requested,
87 * locked vnode. A locked vnode is requested via NLC_LOCKVP. If fp
88 * is non-NULL the vnode will be installed in the file pointer.
90 * NOTE: If the caller wishes the namecache entry to be operated with
91 * a shared lock it must use NLC_SHAREDLOCK. If NLC_LOCKVP is set
92 * then the vnode lock will also be shared.
94 * NOTE: The vnode is referenced just once on return whether or not it
95 * is also installed in the file pointer.
98 vn_open(struct nlookupdata *nd, struct file **fpp, int fmode, int cmode)
100 struct file *fp = fpp ? *fpp : NULL;
102 struct ucred *cred = nd->nl_cred;
104 struct vattr *vap = &vat;
112 * Certain combinations are illegal
114 if ((fmode & (FWRITE | O_TRUNC)) == O_TRUNC)
118 * Lookup the path and create or obtain the vnode. After a
119 * successful lookup a locked nd->nl_nch will be returned.
121 * The result of this section should be a locked vnode.
123 * XXX with only a little work we should be able to avoid locking
124 * the vnode if FWRITE, O_CREAT, and O_TRUNC are *not* set.
126 nd->nl_flags |= NLC_OPEN;
127 if (fmode & O_APPEND)
128 nd->nl_flags |= NLC_APPEND;
130 nd->nl_flags |= NLC_TRUNCATE;
132 nd->nl_flags |= NLC_READ;
134 nd->nl_flags |= NLC_WRITE;
135 if ((fmode & O_EXCL) == 0 && (fmode & O_NOFOLLOW) == 0)
136 nd->nl_flags |= NLC_FOLLOW;
138 if (fmode & O_CREAT) {
140 * CONDITIONAL CREATE FILE CASE
142 * Setting NLC_CREATE causes a negative hit to store
143 * the negative hit ncp and not return an error. Then
144 * nc_error or nc_vp may be checked to see if the ncp
145 * represents a negative hit. NLC_CREATE also requires
146 * write permission on the governing directory or EPERM
149 * If the file exists but is missing write permission,
150 * nlookup() returns EACCES. This has to be handled specially
151 * when combined with O_EXCL.
153 nd->nl_flags |= NLC_CREATE;
154 nd->nl_flags |= NLC_REFDVP;
157 if (error == EACCES && nd->nl_nch.ncp->nc_vp != NULL &&
163 * If no error and nd->nl_dvp is NULL, the nlookup represents
164 * a mount-point or cross-mount situation. e.g.
165 * open("/var/cache", O_CREAT), where /var/cache is a
166 * mount point or a null-mount point.
168 if (error == 0 && nd->nl_dvp == NULL)
172 * NORMAL OPEN FILE CASE
181 * split case to allow us to re-resolve and retry the ncp in case
184 * (error is 0 on entry / retry)
188 * Checks for (likely) filesystem-modifying cases and allows
189 * the filesystem to stall the front-end.
191 if ((fmode & (FWRITE | O_TRUNC)) ||
192 ((fmode & O_CREAT) && nd->nl_nch.ncp->nc_vp == NULL)) {
193 error = ncp_writechk(&nd->nl_nch);
199 if (fmode & O_CREAT) {
200 if (nd->nl_nch.ncp->nc_vp == NULL) {
203 vap->va_mode = cmode;
204 vap->va_fuseflags = fmode; /* FUSE */
206 vap->va_vaflags |= VA_EXCLUSIVE;
207 error = VOP_NCREATE(&nd->nl_nch, nd->nl_dvp, &vp,
212 /* locked vnode is returned */
214 if (fmode & O_EXCL) {
217 error = cache_vget(&nd->nl_nch, cred,
226 * In most other cases a shared lock on the vnode is
227 * sufficient. However, the O_RDWR case needs an
228 * exclusive lock if the vnode is executable. The
229 * NLC_EXCLLOCK_IFEXEC and NCF_NOTX flags help resolve
232 * NOTE: If NCF_NOTX is not set, we do not know the
233 * the state of the 'x' bits and have to get
234 * an exclusive lock for the EXCLLOCK_IFEXEC case.
236 if ((nd->nl_flags & NLC_SHAREDLOCK) &&
237 ((nd->nl_flags & NLC_EXCLLOCK_IFEXEC) == 0 ||
238 nd->nl_nch.ncp->nc_flag & NCF_NOTX)) {
239 error = cache_vget(&nd->nl_nch, cred, LK_SHARED, &vp);
242 error = cache_vget(&nd->nl_nch, cred,
250 * We have a locked vnode and ncp now. Note that the ncp will
251 * be cleaned up by the caller if nd->nl_nch is left intact.
253 if (vp->v_type == VLNK) {
257 if (vp->v_type == VSOCK) {
261 if (vp->v_type != VDIR && (fmode & O_DIRECTORY)) {
265 if ((fmode & O_CREAT) == 0) {
266 if (fmode & (FWRITE | O_TRUNC)) {
267 if (vp->v_type == VDIR) {
273 * Additional checks on vnode (does not substitute
274 * for ncp_writechk()).
276 error = vn_writechk(vp);
279 * Special stale handling, re-resolve the
282 if (error == ESTALE) {
288 cache_unlock(&nd->nl_nch);
289 cache_lock(&nd->nl_nch);
291 cache_setunresolved(&nd->nl_nch);
292 error = cache_resolve(&nd->nl_nch,
302 if (fmode & O_TRUNC) {
303 vn_unlock(vp); /* XXX */
304 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */
305 osize = vp->v_filesize;
308 error = VOP_SETATTR_FP(vp, vap, cred, fp);
311 error = VOP_GETATTR(vp, vap);
315 VFS_ACCOUNT(mp, vap->va_uid, vap->va_gid, -osize);
319 * Set or clear VNSWAPCACHE on the vp based on nd->nl_nch.ncp->nc_flag.
320 * These particular bits a tracked all the way from the root.
322 * NOTE: Might not work properly on NFS servers due to the
323 * disconnected namecache.
325 flags = nd->nl_nch.ncp->nc_flag;
326 if ((flags & (NCF_UF_CACHE | NCF_UF_PCACHE)) &&
327 (flags & (NCF_SF_NOCACHE | NCF_SF_PNOCACHE)) == 0) {
328 vsetflags(vp, VSWAPCACHE);
330 vclrflags(vp, VSWAPCACHE);
334 * Setup the fp so VOP_OPEN can override it. No descriptor has been
335 * associated with the fp yet so we own it clean.
337 * f_nchandle inherits nl_nch. This used to be necessary only for
338 * directories but now we do it unconditionally so f*() ops
339 * such as fchmod() can access the actual namespace that was
340 * used to open the file.
343 if (nd->nl_flags & NLC_APPENDONLY)
344 fmode |= FAPPENDONLY;
345 fp->f_nchandle = nd->nl_nch;
346 cache_zero(&nd->nl_nch);
347 cache_unlock(&fp->f_nchandle);
351 * Get rid of nl_nch. vn_open does not return it (it returns the
352 * vnode or the file pointer).
354 * NOTE: We can't leave nl_nch locked through the VOP_OPEN anyway
355 * since the VOP_OPEN may block, e.g. on /dev/ttyd0
357 * NOTE: The VOP_OPEN() can replace the *fpp we supply with its own
358 * (it will fdrop/fhold), and can also set the *fpp up however
359 * it wants, not necessarily using DTYPE_VNODE.
362 cache_put(&nd->nl_nch);
364 error = VOP_OPEN(vp, fmode, cred, fpp);
365 fp = fpp ? *fpp : NULL;
369 * setting f_ops to &badfileops will prevent the descriptor
370 * code from trying to close and release the vnode, since
371 * the open failed we do not want to call close.
375 fp->f_ops = &badfileops;
382 * Assert that VREG files have been setup for vmio.
384 KASSERT(vp->v_type != VREG || vp->v_object != NULL,
385 ("vn_open: regular file was not VMIO enabled!"));
389 * Return the vnode. XXX needs some cleaning up. The vnode is
390 * only returned in the fp == NULL case.
392 * NOTE: vnode stored in fp may be different
396 nd->nl_vp_fmode = fmode;
397 if ((nd->nl_flags & NLC_LOCKVP) == 0)
410 vn_opendisk(const char *devname, int fmode, struct vnode **vpp)
415 if (strncmp(devname, "/dev/", 5) == 0)
417 if ((vp = getsynthvnode(devname)) == NULL) {
420 error = VOP_OPEN(vp, fmode, proc0.p_ucred, NULL);
432 * Checks for special conditions on the vnode which might prevent writing
433 * after the vnode has (likely) been locked. The vnode might or might not
434 * be locked as of this call, but will be at least referenced.
436 * Also re-checks the mount RDONLY flag that ncp_writechk() checked prior
437 * to the vnode being locked.
440 vn_writechk(struct vnode *vp)
443 * If there's shared text associated with
444 * the vnode, try to free it up once. If
445 * we fail, we can't allow writing.
447 if (vp->v_flag & VTEXT)
449 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_RDONLY))
455 * Check whether the underlying mount is read-only. The mount point
456 * referenced by the namecache may be different from the mount point
457 * used by the underlying vnode in the case of NULLFS, so a separate
460 * Must be called PRIOR to any vnodes being locked.
463 ncp_writechk(struct nchandle *nch)
467 if ((mp = nch->mount) != NULL) {
468 if (mp->mnt_flag & MNT_RDONLY)
470 if (mp->mnt_op->vfs_modifying != vfs_stdmodifying)
482 vn_close(struct vnode *vp, int flags, struct file *fp)
486 error = vn_lock(vp, LK_SHARED | LK_RETRY | LK_FAILRECLAIM);
488 error = VOP_CLOSE(vp, flags, fp);
496 * Sequential heuristic.
498 * MPSAFE (f_seqcount and f_nextoff are allowed to race)
502 sequential_heuristic(struct uio *uio, struct file *fp)
505 * Sequential heuristic - detect sequential operation
507 * NOTE: SMP: We allow f_seqcount updates to race.
509 if ((uio->uio_offset == 0 && fp->f_seqcount > 0) ||
510 uio->uio_offset == fp->f_nextoff) {
511 int tmpseq = fp->f_seqcount;
513 tmpseq += howmany(uio->uio_resid, MAXBSIZE);
514 if (tmpseq > IO_SEQMAX)
516 fp->f_seqcount = tmpseq;
517 return(fp->f_seqcount << IO_SEQSHIFT);
521 * Not sequential, quick draw-down of seqcount
523 * NOTE: SMP: We allow f_seqcount updates to race.
525 if (fp->f_seqcount > 1)
533 * get - lock and return the f_offset field.
534 * set - set and unlock the f_offset field.
536 * These routines serve the dual purpose of serializing access to the
537 * f_offset field (at least on x86) and guaranteeing operational integrity
538 * when multiple read()ers and write()ers are present on the same fp.
542 static __inline off_t
543 vn_get_fpf_offset(struct file *fp)
549 * Shortcut critical path.
551 flags = fp->f_flag & ~FOFFSETLOCK;
552 if (atomic_cmpset_int(&fp->f_flag, flags, flags | FOFFSETLOCK))
553 return(fp->f_offset);
560 if (flags & FOFFSETLOCK) {
561 nflags = flags | FOFFSETWAKE;
562 tsleep_interlock(&fp->f_flag, 0);
563 if (atomic_cmpset_int(&fp->f_flag, flags, nflags))
564 tsleep(&fp->f_flag, PINTERLOCKED, "fpoff", 0);
566 nflags = flags | FOFFSETLOCK;
567 if (atomic_cmpset_int(&fp->f_flag, flags, nflags))
571 return(fp->f_offset);
578 vn_set_fpf_offset(struct file *fp, off_t offset)
584 * We hold the lock so we can set the offset without interference.
586 fp->f_offset = offset;
589 * Normal release is already a reasonably critical path.
593 nflags = flags & ~(FOFFSETLOCK | FOFFSETWAKE);
594 if (atomic_cmpset_int(&fp->f_flag, flags, nflags)) {
595 if (flags & FOFFSETWAKE)
605 static __inline off_t
606 vn_poll_fpf_offset(struct file *fp)
608 #if defined(__x86_64__)
609 return(fp->f_offset);
611 off_t off = vn_get_fpf_offset(fp);
612 vn_set_fpf_offset(fp, off);
618 * Package up an I/O request on a vnode into a uio and do it.
623 vn_rdwr(enum uio_rw rw, struct vnode *vp, caddr_t base, int len,
624 off_t offset, enum uio_seg segflg, int ioflg,
625 struct ucred *cred, int *aresid)
631 if ((ioflg & IO_NODELOCKED) == 0)
632 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
633 auio.uio_iov = &aiov;
635 aiov.iov_base = base;
637 auio.uio_resid = len;
638 auio.uio_offset = offset;
639 auio.uio_segflg = segflg;
641 auio.uio_td = curthread;
642 if (rw == UIO_READ) {
643 error = VOP_READ(vp, &auio, ioflg, cred);
645 error = VOP_WRITE(vp, &auio, ioflg, cred);
648 *aresid = auio.uio_resid;
650 if (auio.uio_resid && error == 0)
652 if ((ioflg & IO_NODELOCKED) == 0)
658 * Package up an I/O request on a vnode into a uio and do it. The I/O
659 * request is split up into smaller chunks and we try to avoid saturating
660 * the buffer cache while potentially holding a vnode locked, so we
661 * check bwillwrite() before calling vn_rdwr(). We also call lwkt_user_yield()
662 * to give other processes a chance to lock the vnode (either other processes
663 * core'ing the same binary, or unrelated processes scanning the directory).
668 vn_rdwr_inchunks(enum uio_rw rw, struct vnode *vp, caddr_t base, int len,
669 off_t offset, enum uio_seg segflg, int ioflg,
670 struct ucred *cred, int *aresid)
678 * Force `offset' to a multiple of MAXBSIZE except possibly
679 * for the first chunk, so that filesystems only need to
680 * write full blocks except possibly for the first and last
683 chunk = MAXBSIZE - (uoff_t)offset % MAXBSIZE;
687 if (vp->v_type == VREG && (ioflg & IO_RECURSE) == 0) {
697 error = vn_rdwr(rw, vp, base, chunk, offset, segflg,
698 ioflg, cred, aresid);
699 len -= chunk; /* aresid calc already includes length */
712 * File pointers can no longer get ripped up by revoke so
713 * we don't need to lock access to the vp.
715 * f_offset updates are not guaranteed against multiple readers
718 vn_read(struct file *fp, struct uio *uio, struct ucred *cred, int flags)
723 KASSERT(uio->uio_td == curthread,
724 ("uio_td %p is not td %p", uio->uio_td, curthread));
725 vp = (struct vnode *)fp->f_data;
728 if (flags & O_FBLOCKING) {
729 /* ioflag &= ~IO_NDELAY; */
730 } else if (flags & O_FNONBLOCKING) {
732 } else if (fp->f_flag & FNONBLOCK) {
735 if (fp->f_flag & O_DIRECT) {
738 if ((flags & O_FOFFSET) == 0 && (vp->v_flag & VNOTSEEKABLE) == 0)
739 uio->uio_offset = vn_get_fpf_offset(fp);
740 vn_lock(vp, LK_SHARED | LK_RETRY);
741 ioflag |= sequential_heuristic(uio, fp);
743 error = VOP_READ_FP(vp, uio, ioflag, cred, fp);
744 fp->f_nextoff = uio->uio_offset;
746 if ((flags & O_FOFFSET) == 0 && (vp->v_flag & VNOTSEEKABLE) == 0)
747 vn_set_fpf_offset(fp, uio->uio_offset);
755 vn_write(struct file *fp, struct uio *uio, struct ucred *cred, int flags)
760 KASSERT(uio->uio_td == curthread,
761 ("uio_td %p is not p %p", uio->uio_td, curthread));
762 vp = (struct vnode *)fp->f_data;
765 if (vp->v_type == VREG &&
766 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) {
770 if (flags & O_FBLOCKING) {
771 /* ioflag &= ~IO_NDELAY; */
772 } else if (flags & O_FNONBLOCKING) {
774 } else if (fp->f_flag & FNONBLOCK) {
777 if (fp->f_flag & O_DIRECT) {
780 if (flags & O_FASYNCWRITE) {
781 /* ioflag &= ~IO_SYNC; */
782 } else if (flags & O_FSYNCWRITE) {
784 } else if (fp->f_flag & O_FSYNC) {
788 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))
790 if ((flags & O_FOFFSET) == 0)
791 uio->uio_offset = vn_get_fpf_offset(fp);
793 VFS_MODIFYING(vp->v_mount);
794 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
795 ioflag |= sequential_heuristic(uio, fp);
796 error = VOP_WRITE_FP(vp, uio, ioflag, cred, fp);
797 fp->f_nextoff = uio->uio_offset;
799 if ((flags & O_FOFFSET) == 0)
800 vn_set_fpf_offset(fp, uio->uio_offset);
808 vn_statfile(struct file *fp, struct stat *sb, struct ucred *cred)
813 vp = (struct vnode *)fp->f_data;
814 error = vn_stat(vp, sb, cred);
822 vn_stat(struct vnode *vp, struct stat *sb, struct ucred *cred)
831 * vp already has a ref and is validated, can call unlocked.
834 error = VOP_GETATTR(vp, vap);
839 * Zero the spare stat fields
845 * Copy from vattr table
847 if (vap->va_fsid != VNOVAL)
848 sb->st_dev = vap->va_fsid;
850 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0];
851 sb->st_ino = vap->va_fileid;
853 switch (vap->va_type) {
871 /* This is a cosmetic change, symlinks do not have a mode. */
872 if (vp->v_mount->mnt_flag & MNT_NOSYMFOLLOW)
873 sb->st_mode &= ~ACCESSPERMS; /* 0000 */
875 sb->st_mode |= ACCESSPERMS; /* 0777 */
887 if (vap->va_nlink > (nlink_t)-1)
888 sb->st_nlink = (nlink_t)-1;
890 sb->st_nlink = vap->va_nlink;
891 sb->st_uid = vap->va_uid;
892 sb->st_gid = vap->va_gid;
893 sb->st_rdev = devid_from_dev(vp->v_rdev);
894 sb->st_size = vap->va_size;
895 sb->st_atimespec = vap->va_atime;
896 sb->st_mtimespec = vap->va_mtime;
897 sb->st_ctimespec = vap->va_ctime;
900 * A VCHR and VBLK device may track the last access and last modified
901 * time independantly of the filesystem. This is particularly true
902 * because device read and write calls may bypass the filesystem.
904 if (vp->v_type == VCHR || vp->v_type == VBLK) {
907 if (dev->si_lastread) {
908 sb->st_atimespec.tv_sec = time_second +
911 sb->st_atimespec.tv_nsec = 0;
913 if (dev->si_lastwrite) {
914 sb->st_mtimespec.tv_sec = time_second +
917 sb->st_mtimespec.tv_nsec = 0;
923 * According to www.opengroup.org, the meaning of st_blksize is
924 * "a filesystem-specific preferred I/O block size for this
925 * object. In some filesystem types, this may vary from file
927 * Default to PAGE_SIZE after much discussion.
930 if (vap->va_type == VREG) {
931 sb->st_blksize = vap->va_blocksize;
932 } else if (vn_isdisk(vp, NULL)) {
934 * XXX this is broken. If the device is not yet open (aka
935 * stat() call, aka v_rdev == NULL), how are we supposed
936 * to get a valid block size out of it?
940 sb->st_blksize = dev->si_bsize_best;
941 if (sb->st_blksize < dev->si_bsize_phys)
942 sb->st_blksize = dev->si_bsize_phys;
943 if (sb->st_blksize < BLKDEV_IOSIZE)
944 sb->st_blksize = BLKDEV_IOSIZE;
946 sb->st_blksize = PAGE_SIZE;
949 sb->st_flags = vap->va_flags;
951 error = priv_check_cred(cred, PRIV_VFS_GENERATION, 0);
955 sb->st_gen = (u_int32_t)vap->va_gen;
957 sb->st_blocks = vap->va_bytes / S_BLKSIZE;
960 * This is for ABI compatibility <= 5.7 (for ABI change made in
963 sb->__old_st_blksize = sb->st_blksize;
969 * MPALMOSTSAFE - acquires mplock
972 vn_ioctl(struct file *fp, u_long com, caddr_t data, struct ucred *ucred,
975 struct vnode *vp = ((struct vnode *)fp->f_data);
981 switch (vp->v_type) {
984 if (com == FIONREAD) {
985 error = VOP_GETATTR(vp, &vattr);
988 size = vattr.va_size;
989 if ((vp->v_flag & VNOTSEEKABLE) == 0)
990 size -= vn_poll_fpf_offset(fp);
991 if (size > 0x7FFFFFFF)
997 if (com == FIOASYNC) { /* XXX */
1009 if (com == FIODTYPE) {
1010 if (vp->v_type != VCHR && vp->v_type != VBLK) {
1014 *(int *)data = dev_dflags(vp->v_rdev) & D_TYPEMASK;
1018 error = VOP_IOCTL(vp, com, data, fp->f_flag, ucred, msg);
1019 if (error == 0 && com == TIOCSCTTY) {
1020 struct proc *p = curthread->td_proc;
1021 struct session *sess;
1029 sess = p->p_session;
1030 /* Do nothing if reassigning same control tty */
1031 if (sess->s_ttyvp == vp) {
1037 /* Get rid of reference to old control tty */
1038 ovp = sess->s_ttyvp;
1051 * Obtain the requested vnode lock
1053 * LK_RETRY Automatically retry on timeout
1054 * LK_FAILRECLAIM Fail if the vnode is being reclaimed
1056 * Failures will occur if the vnode is undergoing recyclement, but not
1057 * all callers expect that the function will fail so the caller must pass
1058 * LK_FAILOK if it wants to process an error code.
1060 * Errors can occur for other reasons if you pass in other LK_ flags,
1061 * regardless of whether you pass in LK_FAILRECLAIM
1064 vn_lock(struct vnode *vp, int flags)
1069 error = lockmgr(&vp->v_lock, flags);
1072 } while (flags & LK_RETRY);
1075 * Because we (had better!) have a ref on the vnode, once it
1076 * goes to VRECLAIMED state it will not be recycled until all
1077 * refs go away. So we can just check the flag.
1079 if (error == 0 && (vp->v_flag & VRECLAIMED)) {
1080 if (flags & LK_FAILRECLAIM) {
1081 lockmgr(&vp->v_lock, LK_RELEASE);
1089 vn_relock(struct vnode *vp, int flags)
1094 error = lockmgr(&vp->v_lock, flags);
1097 } while (flags & LK_RETRY);
1102 #ifdef DEBUG_VN_UNLOCK
1105 debug_vn_unlock(struct vnode *vp, const char *filename, int line)
1107 kprintf("vn_unlock from %s:%d\n", filename, line);
1108 lockmgr(&vp->v_lock, LK_RELEASE);
1114 vn_unlock(struct vnode *vp)
1116 lockmgr(&vp->v_lock, LK_RELEASE);
1125 vn_islocked(struct vnode *vp)
1127 return (lockstatus(&vp->v_lock, curthread));
1131 * Return the lock status of a vnode and unlock the vnode
1132 * if we owned the lock. This is not a boolean, if the
1133 * caller cares what the lock status is the caller must
1134 * check the various possible values.
1136 * This only unlocks exclusive locks held by the caller,
1137 * it will NOT unlock shared locks (there is no way to
1138 * tell who the shared lock belongs to).
1143 vn_islocked_unlock(struct vnode *vp)
1147 vpls = lockstatus(&vp->v_lock, curthread);
1148 if (vpls == LK_EXCLUSIVE)
1149 lockmgr(&vp->v_lock, LK_RELEASE);
1154 * Restore a vnode lock that we previously released via
1155 * vn_islocked_unlock(). This is a NOP if we did not
1156 * own the original lock.
1161 vn_islocked_relock(struct vnode *vp, int vpls)
1165 if (vpls == LK_EXCLUSIVE)
1166 error = lockmgr(&vp->v_lock, vpls);
1173 vn_closefile(struct file *fp)
1177 fp->f_ops = &badfileops;
1178 error = vn_close(((struct vnode *)fp->f_data), fp->f_flag, fp);
1186 vn_kqfilter(struct file *fp, struct knote *kn)
1190 error = VOP_KQFILTER(((struct vnode *)fp->f_data), kn);