2 * Copyright (c) 1982, 1986, 1989, 1993
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4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
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35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)vfs_vnops.c 8.2 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/vfs_vnops.c,v 1.87.2.13 2002/12/29 18:19:53 dillon Exp $
40 * $DragonFly: src/sys/kern/vfs_vnops.c,v 1.58 2008/06/28 17:59:49 dillon Exp $
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/fcntl.h>
50 #include <sys/mount.h>
51 #include <sys/nlookup.h>
52 #include <sys/vnode.h>
54 #include <sys/filio.h>
55 #include <sys/ttycom.h>
57 #include <sys/sysctl.h>
58 #include <sys/syslog.h>
60 #include <sys/thread2.h>
62 static int vn_closefile (struct file
*fp
);
63 static int vn_ioctl (struct file
*fp
, u_long com
, caddr_t data
,
64 struct ucred
*cred
, struct sysmsg
*msg
);
65 static int vn_read (struct file
*fp
, struct uio
*uio
,
66 struct ucred
*cred
, int flags
);
67 static int vn_poll (struct file
*fp
, int events
, struct ucred
*cred
);
68 static int vn_kqfilter (struct file
*fp
, struct knote
*kn
);
69 static int vn_statfile (struct file
*fp
, struct stat
*sb
, struct ucred
*cred
);
70 static int vn_write (struct file
*fp
, struct uio
*uio
,
71 struct ucred
*cred
, int flags
);
74 static int read_mpsafe
= 0;
75 SYSCTL_INT(_vfs
, OID_AUTO
, read_mpsafe
, CTLFLAG_RW
, &read_mpsafe
, 0, "");
76 static int write_mpsafe
= 0;
77 SYSCTL_INT(_vfs
, OID_AUTO
, write_mpsafe
, CTLFLAG_RW
, &write_mpsafe
, 0, "");
78 static int getattr_mpsafe
= 0;
79 SYSCTL_INT(_vfs
, OID_AUTO
, getattr_mpsafe
, CTLFLAG_RW
, &getattr_mpsafe
, 0, "");
82 #define write_mpsafe 0
83 #define getattr_mpsafe 0
86 struct fileops vnode_fileops
= {
91 .fo_kqfilter
= vn_kqfilter
,
92 .fo_stat
= vn_statfile
,
93 .fo_close
= vn_closefile
,
94 .fo_shutdown
= nofo_shutdown
98 * Common code for vnode open operations. Check permissions, and call
99 * the VOP_NOPEN or VOP_NCREATE routine.
101 * The caller is responsible for setting up nd with nlookup_init() and
102 * for cleaning it up with nlookup_done(), whether we return an error
105 * On success nd->nl_open_vp will hold a referenced and, if requested,
106 * locked vnode. A locked vnode is requested via NLC_LOCKVP. If fp
107 * is non-NULL the vnode will be installed in the file pointer.
109 * NOTE: The vnode is referenced just once on return whether or not it
110 * is also installed in the file pointer.
113 vn_open(struct nlookupdata
*nd
, struct file
*fp
, int fmode
, int cmode
)
116 struct ucred
*cred
= nd
->nl_cred
;
118 struct vattr
*vap
= &vat
;
122 * Certain combinations are illegal
124 if ((fmode
& (FWRITE
| O_TRUNC
)) == O_TRUNC
)
128 * Lookup the path and create or obtain the vnode. After a
129 * successful lookup a locked nd->nl_nch will be returned.
131 * The result of this section should be a locked vnode.
133 * XXX with only a little work we should be able to avoid locking
134 * the vnode if FWRITE, O_CREAT, and O_TRUNC are *not* set.
136 nd
->nl_flags
|= NLC_OPEN
;
137 if (fmode
& O_APPEND
)
138 nd
->nl_flags
|= NLC_APPEND
;
140 nd
->nl_flags
|= NLC_TRUNCATE
;
142 nd
->nl_flags
|= NLC_READ
;
144 nd
->nl_flags
|= NLC_WRITE
;
145 if ((fmode
& O_EXCL
) == 0 && (fmode
& O_NOFOLLOW
) == 0)
146 nd
->nl_flags
|= NLC_FOLLOW
;
148 if (fmode
& O_CREAT
) {
150 * CONDITIONAL CREATE FILE CASE
152 * Setting NLC_CREATE causes a negative hit to store
153 * the negative hit ncp and not return an error. Then
154 * nc_error or nc_vp may be checked to see if the ncp
155 * represents a negative hit. NLC_CREATE also requires
156 * write permission on the governing directory or EPERM
159 nd
->nl_flags
|= NLC_CREATE
;
160 nd
->nl_flags
|= NLC_REFDVP
;
165 * NORMAL OPEN FILE CASE
174 * split case to allow us to re-resolve and retry the ncp in case
178 if (fmode
& O_CREAT
) {
179 if (nd
->nl_nch
.ncp
->nc_vp
== NULL
) {
180 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
184 vap
->va_mode
= cmode
;
186 vap
->va_vaflags
|= VA_EXCLUSIVE
;
187 error
= VOP_NCREATE(&nd
->nl_nch
, nd
->nl_dvp
, &vp
,
192 /* locked vnode is returned */
194 if (fmode
& O_EXCL
) {
197 error
= cache_vget(&nd
->nl_nch
, cred
,
205 error
= cache_vget(&nd
->nl_nch
, cred
, LK_EXCLUSIVE
, &vp
);
211 * We have a locked vnode and ncp now. Note that the ncp will
212 * be cleaned up by the caller if nd->nl_nch is left intact.
214 if (vp
->v_type
== VLNK
) {
218 if (vp
->v_type
== VSOCK
) {
222 if ((fmode
& O_CREAT
) == 0) {
223 if (fmode
& (FWRITE
| O_TRUNC
)) {
224 if (vp
->v_type
== VDIR
) {
228 error
= vn_writechk(vp
, &nd
->nl_nch
);
231 * Special stale handling, re-resolve the
234 if (error
== ESTALE
) {
237 cache_setunresolved(&nd
->nl_nch
);
238 error
= cache_resolve(&nd
->nl_nch
, cred
);
246 if (fmode
& O_TRUNC
) {
247 vn_unlock(vp
); /* XXX */
248 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
); /* XXX */
251 error
= VOP_SETATTR(vp
, vap
, cred
);
257 * Setup the fp so VOP_OPEN can override it. No descriptor has been
258 * associated with the fp yet so we own it clean.
260 * f_nchandle inherits nl_nch. This used to be necessary only for
261 * directories but now we do it unconditionally so f*() ops
262 * such as fchmod() can access the actual namespace that was
263 * used to open the file.
266 if (nd
->nl_flags
& NLC_APPENDONLY
)
267 fmode
|= FAPPENDONLY
;
268 fp
->f_nchandle
= nd
->nl_nch
;
269 cache_zero(&nd
->nl_nch
);
270 cache_unlock(&fp
->f_nchandle
);
274 * Get rid of nl_nch. vn_open does not return it (it returns the
275 * vnode or the file pointer). Note: we can't leave nl_nch locked
276 * through the VOP_OPEN anyway since the VOP_OPEN may block, e.g.
280 cache_put(&nd
->nl_nch
);
282 error
= VOP_OPEN(vp
, fmode
, cred
, fp
);
285 * setting f_ops to &badfileops will prevent the descriptor
286 * code from trying to close and release the vnode, since
287 * the open failed we do not want to call close.
291 fp
->f_ops
= &badfileops
;
298 * Assert that VREG files have been setup for vmio.
300 KASSERT(vp
->v_type
!= VREG
|| vp
->v_object
!= NULL
,
301 ("vn_open: regular file was not VMIO enabled!"));
305 * Return the vnode. XXX needs some cleaning up. The vnode is
306 * only returned in the fp == NULL case.
310 nd
->nl_vp_fmode
= fmode
;
311 if ((nd
->nl_flags
& NLC_LOCKVP
) == 0)
324 vn_opendisk(const char *devname
, int fmode
, struct vnode
**vpp
)
329 if (strncmp(devname
, "/dev/", 5) == 0)
331 if ((vp
= getsynthvnode(devname
)) == NULL
) {
334 error
= VOP_OPEN(vp
, fmode
, proc0
.p_ucred
, NULL
);
346 * Check for write permissions on the specified vnode. nch may be NULL.
349 vn_writechk(struct vnode
*vp
, struct nchandle
*nch
)
352 * If there's shared text associated with
353 * the vnode, try to free it up once. If
354 * we fail, we can't allow writing.
356 if (vp
->v_flag
& VTEXT
)
360 * If the vnode represents a regular file, check the mount
361 * point via the nch. This may be a different mount point
362 * then the one embedded in the vnode (e.g. nullfs).
364 * We can still write to non-regular files (e.g. devices)
365 * via read-only mounts.
367 if (nch
&& nch
->ncp
&& vp
->v_type
== VREG
)
368 return (ncp_writechk(nch
));
373 * Check whether the underlying mount is read-only. The mount point
374 * referenced by the namecache may be different from the mount point
375 * used by the underlying vnode in the case of NULLFS, so a separate
379 ncp_writechk(struct nchandle
*nch
)
381 if (nch
->mount
&& (nch
->mount
->mnt_flag
& MNT_RDONLY
))
390 vn_close(struct vnode
*vp
, int flags
)
394 error
= vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
396 error
= VOP_CLOSE(vp
, flags
);
405 sequential_heuristic(struct uio
*uio
, struct file
*fp
)
408 * Sequential heuristic - detect sequential operation
410 * NOTE: SMP: We allow f_seqcount updates to race.
412 if ((uio
->uio_offset
== 0 && fp
->f_seqcount
> 0) ||
413 uio
->uio_offset
== fp
->f_nextoff
) {
414 int tmpseq
= fp
->f_seqcount
;
416 * XXX we assume that the filesystem block size is
417 * the default. Not true, but still gives us a pretty
418 * good indicator of how sequential the read operations
421 tmpseq
+= (uio
->uio_resid
+ BKVASIZE
- 1) / BKVASIZE
;
422 if (tmpseq
> IO_SEQMAX
)
424 fp
->f_seqcount
= tmpseq
;
425 return(fp
->f_seqcount
<< IO_SEQSHIFT
);
429 * Not sequential, quick draw-down of seqcount
431 * NOTE: SMP: We allow f_seqcount updates to race.
433 if (fp
->f_seqcount
> 1)
441 * get - lock and return the f_offset field.
442 * set - set and unlock the f_offset field.
444 * These routines serve the dual purpose of serializing access to the
445 * f_offset field (at least on i386) and guaranteeing operational integrity
446 * when multiple read()ers and write()ers are present on the same fp.
448 static __inline off_t
449 vn_get_fpf_offset(struct file
*fp
)
455 * Shortcut critical path.
457 flags
= fp
->f_flag
& ~FOFFSETLOCK
;
458 if (atomic_cmpset_int(&fp
->f_flag
, flags
, flags
| FOFFSETLOCK
))
459 return(fp
->f_offset
);
466 if (flags
& FOFFSETLOCK
) {
467 nflags
= flags
| FOFFSETWAKE
;
468 tsleep_interlock(&fp
->f_flag
, 0);
469 if (atomic_cmpset_int(&fp
->f_flag
, flags
, nflags
))
470 tsleep(&fp
->f_flag
, PINTERLOCKED
, "fpoff", 0);
472 nflags
= flags
| FOFFSETLOCK
;
473 if (atomic_cmpset_int(&fp
->f_flag
, flags
, nflags
))
477 return(fp
->f_offset
);
481 vn_set_fpf_offset(struct file
*fp
, off_t offset
)
487 * We hold the lock so we can set the offset without interference.
489 fp
->f_offset
= offset
;
492 * Normal release is already a reasonably critical path.
496 nflags
= flags
& ~(FOFFSETLOCK
| FOFFSETWAKE
);
497 if (atomic_cmpset_int(&fp
->f_flag
, flags
, nflags
)) {
498 if (flags
& FOFFSETWAKE
)
505 static __inline off_t
506 vn_poll_fpf_offset(struct file
*fp
)
508 #if defined(__amd64__) || !defined(SMP)
509 return(fp
->f_offset
);
511 off_t off
= vn_get_fpf_offset(fp
);
512 vn_set_fpf_offset(fp
, off
);
518 * Package up an I/O request on a vnode into a uio and do it.
521 vn_rdwr(enum uio_rw rw
, struct vnode
*vp
, caddr_t base
, int len
,
522 off_t offset
, enum uio_seg segflg
, int ioflg
,
523 struct ucred
*cred
, int *aresid
)
527 struct ccms_lock ccms_lock
;
530 if ((ioflg
& IO_NODELOCKED
) == 0)
531 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
532 auio
.uio_iov
= &aiov
;
534 aiov
.iov_base
= base
;
536 auio
.uio_resid
= len
;
537 auio
.uio_offset
= offset
;
538 auio
.uio_segflg
= segflg
;
540 auio
.uio_td
= curthread
;
541 ccms_lock_get_uio(&vp
->v_ccms
, &ccms_lock
, &auio
);
542 if (rw
== UIO_READ
) {
543 error
= VOP_READ(vp
, &auio
, ioflg
, cred
);
545 error
= VOP_WRITE(vp
, &auio
, ioflg
, cred
);
547 ccms_lock_put(&vp
->v_ccms
, &ccms_lock
);
549 *aresid
= auio
.uio_resid
;
551 if (auio
.uio_resid
&& error
== 0)
553 if ((ioflg
& IO_NODELOCKED
) == 0)
559 * Package up an I/O request on a vnode into a uio and do it. The I/O
560 * request is split up into smaller chunks and we try to avoid saturating
561 * the buffer cache while potentially holding a vnode locked, so we
562 * check bwillwrite() before calling vn_rdwr(). We also call uio_yield()
563 * to give other processes a chance to lock the vnode (either other processes
564 * core'ing the same binary, or unrelated processes scanning the directory).
567 vn_rdwr_inchunks(enum uio_rw rw
, struct vnode
*vp
, caddr_t base
, int len
,
568 off_t offset
, enum uio_seg segflg
, int ioflg
,
569 struct ucred
*cred
, int *aresid
)
577 * Force `offset' to a multiple of MAXBSIZE except possibly
578 * for the first chunk, so that filesystems only need to
579 * write full blocks except possibly for the first and last
582 chunk
= MAXBSIZE
- (uoff_t
)offset
% MAXBSIZE
;
586 if (vp
->v_type
== VREG
) {
596 error
= vn_rdwr(rw
, vp
, base
, chunk
, offset
, segflg
,
597 ioflg
, cred
, aresid
);
598 len
-= chunk
; /* aresid calc already includes length */
611 * MPALMOSTSAFE - acquires mplock
613 * File pointers can no longer get ripped up by revoke so
614 * we don't need to lock access to the vp.
616 * f_offset updates are not guaranteed against multiple readers
619 vn_read(struct file
*fp
, struct uio
*uio
, struct ucred
*cred
, int flags
)
621 struct ccms_lock ccms_lock
;
625 KASSERT(uio
->uio_td
== curthread
,
626 ("uio_td %p is not td %p", uio
->uio_td
, curthread
));
627 vp
= (struct vnode
*)fp
->f_data
;
630 if (flags
& O_FBLOCKING
) {
631 /* ioflag &= ~IO_NDELAY; */
632 } else if (flags
& O_FNONBLOCKING
) {
634 } else if (fp
->f_flag
& FNONBLOCK
) {
637 if (flags
& O_FBUFFERED
) {
638 /* ioflag &= ~IO_DIRECT; */
639 } else if (flags
& O_FUNBUFFERED
) {
641 } else if (fp
->f_flag
& O_DIRECT
) {
644 if ((flags
& O_FOFFSET
) == 0 && (vp
->v_flag
& VNOTSEEKABLE
) == 0)
645 uio
->uio_offset
= vn_get_fpf_offset(fp
);
646 vn_lock(vp
, LK_SHARED
| LK_RETRY
);
647 ioflag
|= sequential_heuristic(uio
, fp
);
649 ccms_lock_get_uio(&vp
->v_ccms
, &ccms_lock
, uio
);
650 if (read_mpsafe
&& (vp
->v_flag
& VMP_READ
)) {
651 error
= VOP_READ(vp
, uio
, ioflag
, cred
);
654 error
= VOP_READ(vp
, uio
, ioflag
, cred
);
657 ccms_lock_put(&vp
->v_ccms
, &ccms_lock
);
658 fp
->f_nextoff
= uio
->uio_offset
;
660 if ((flags
& O_FOFFSET
) == 0 && (vp
->v_flag
& VNOTSEEKABLE
) == 0)
661 vn_set_fpf_offset(fp
, uio
->uio_offset
);
666 * MPALMOSTSAFE - acquires mplock
669 vn_write(struct file
*fp
, struct uio
*uio
, struct ucred
*cred
, int flags
)
671 struct ccms_lock ccms_lock
;
675 KASSERT(uio
->uio_td
== curthread
,
676 ("uio_td %p is not p %p", uio
->uio_td
, curthread
));
677 vp
= (struct vnode
*)fp
->f_data
;
680 if (vp
->v_type
== VREG
&&
681 ((fp
->f_flag
& O_APPEND
) || (flags
& O_FAPPEND
))) {
685 if (flags
& O_FBLOCKING
) {
686 /* ioflag &= ~IO_NDELAY; */
687 } else if (flags
& O_FNONBLOCKING
) {
689 } else if (fp
->f_flag
& FNONBLOCK
) {
692 if (flags
& O_FBUFFERED
) {
693 /* ioflag &= ~IO_DIRECT; */
694 } else if (flags
& O_FUNBUFFERED
) {
696 } else if (fp
->f_flag
& O_DIRECT
) {
699 if (flags
& O_FASYNCWRITE
) {
700 /* ioflag &= ~IO_SYNC; */
701 } else if (flags
& O_FSYNCWRITE
) {
703 } else if (fp
->f_flag
& O_FSYNC
) {
707 if (vp
->v_mount
&& (vp
->v_mount
->mnt_flag
& MNT_SYNCHRONOUS
))
709 if ((flags
& O_FOFFSET
) == 0)
710 uio
->uio_offset
= vn_get_fpf_offset(fp
);
711 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
712 ioflag
|= sequential_heuristic(uio
, fp
);
713 ccms_lock_get_uio(&vp
->v_ccms
, &ccms_lock
, uio
);
714 if (write_mpsafe
&& (vp
->v_flag
& VMP_WRITE
)) {
715 error
= VOP_WRITE(vp
, uio
, ioflag
, cred
);
718 error
= VOP_WRITE(vp
, uio
, ioflag
, cred
);
721 ccms_lock_put(&vp
->v_ccms
, &ccms_lock
);
722 fp
->f_nextoff
= uio
->uio_offset
;
724 if ((flags
& O_FOFFSET
) == 0)
725 vn_set_fpf_offset(fp
, uio
->uio_offset
);
733 vn_statfile(struct file
*fp
, struct stat
*sb
, struct ucred
*cred
)
738 vp
= (struct vnode
*)fp
->f_data
;
739 error
= vn_stat(vp
, sb
, cred
);
744 * MPSAFE (if vnode has VMP_GETATTR)
747 vn_stat(struct vnode
*vp
, struct stat
*sb
, struct ucred
*cred
)
756 if (getattr_mpsafe
&& (vp
->v_flag
& VMP_GETATTR
)) {
757 error
= VOP_GETATTR(vp
, vap
);
760 error
= VOP_GETATTR(vp
, vap
);
767 * Zero the spare stat fields
773 * Copy from vattr table
775 if (vap
->va_fsid
!= VNOVAL
)
776 sb
->st_dev
= vap
->va_fsid
;
778 sb
->st_dev
= vp
->v_mount
->mnt_stat
.f_fsid
.val
[0];
779 sb
->st_ino
= vap
->va_fileid
;
781 switch (vap
->va_type
) {
799 /* This is a cosmetic change, symlinks do not have a mode. */
800 if (vp
->v_mount
->mnt_flag
& MNT_NOSYMFOLLOW
)
801 sb
->st_mode
&= ~ACCESSPERMS
; /* 0000 */
803 sb
->st_mode
|= ACCESSPERMS
; /* 0777 */
815 if (vap
->va_nlink
> (nlink_t
)-1)
816 sb
->st_nlink
= (nlink_t
)-1;
818 sb
->st_nlink
= vap
->va_nlink
;
819 sb
->st_uid
= vap
->va_uid
;
820 sb
->st_gid
= vap
->va_gid
;
821 sb
->st_rdev
= dev2udev(vp
->v_rdev
);
822 sb
->st_size
= vap
->va_size
;
823 sb
->st_atimespec
= vap
->va_atime
;
824 sb
->st_mtimespec
= vap
->va_mtime
;
825 sb
->st_ctimespec
= vap
->va_ctime
;
828 * A VCHR and VBLK device may track the last access and last modified
829 * time independantly of the filesystem. This is particularly true
830 * because device read and write calls may bypass the filesystem.
832 if (vp
->v_type
== VCHR
|| vp
->v_type
== VBLK
) {
835 if (dev
->si_lastread
) {
836 sb
->st_atimespec
.tv_sec
= dev
->si_lastread
;
837 sb
->st_atimespec
.tv_nsec
= 0;
839 if (dev
->si_lastwrite
) {
840 sb
->st_atimespec
.tv_sec
= dev
->si_lastwrite
;
841 sb
->st_atimespec
.tv_nsec
= 0;
847 * According to www.opengroup.org, the meaning of st_blksize is
848 * "a filesystem-specific preferred I/O block size for this
849 * object. In some filesystem types, this may vary from file
851 * Default to PAGE_SIZE after much discussion.
854 if (vap
->va_type
== VREG
) {
855 sb
->st_blksize
= vap
->va_blocksize
;
856 } else if (vn_isdisk(vp
, NULL
)) {
858 * XXX this is broken. If the device is not yet open (aka
859 * stat() call, aka v_rdev == NULL), how are we supposed
860 * to get a valid block size out of it?
864 sb
->st_blksize
= dev
->si_bsize_best
;
865 if (sb
->st_blksize
< dev
->si_bsize_phys
)
866 sb
->st_blksize
= dev
->si_bsize_phys
;
867 if (sb
->st_blksize
< BLKDEV_IOSIZE
)
868 sb
->st_blksize
= BLKDEV_IOSIZE
;
870 sb
->st_blksize
= PAGE_SIZE
;
873 sb
->st_flags
= vap
->va_flags
;
875 error
= priv_check_cred(cred
, PRIV_VFS_GENERATION
, 0);
879 sb
->st_gen
= (u_int32_t
)vap
->va_gen
;
881 sb
->st_blocks
= vap
->va_bytes
/ S_BLKSIZE
;
882 sb
->st_fsmid
= vap
->va_fsmid
;
887 * MPALMOSTSAFE - acquires mplock
890 vn_ioctl(struct file
*fp
, u_long com
, caddr_t data
, struct ucred
*ucred
,
893 struct vnode
*vp
= ((struct vnode
*)fp
->f_data
);
901 switch (vp
->v_type
) {
904 if (com
== FIONREAD
) {
905 error
= VOP_GETATTR(vp
, &vattr
);
908 size
= vattr
.va_size
;
909 if ((vp
->v_flag
& VNOTSEEKABLE
) == 0)
910 size
-= vn_poll_fpf_offset(fp
);
911 if (size
> 0x7FFFFFFF)
917 if (com
== FIOASYNC
) { /* XXX */
929 if (com
== FIODTYPE
) {
930 if (vp
->v_type
!= VCHR
&& vp
->v_type
!= VBLK
) {
934 *(int *)data
= dev_dflags(vp
->v_rdev
) & D_TYPEMASK
;
938 error
= VOP_IOCTL(vp
, com
, data
, fp
->f_flag
, ucred
, msg
);
939 if (error
== 0 && com
== TIOCSCTTY
) {
940 struct proc
*p
= curthread
->td_proc
;
941 struct session
*sess
;
949 /* Do nothing if reassigning same control tty */
950 if (sess
->s_ttyvp
== vp
) {
955 /* Get rid of reference to old control tty */
969 * MPALMOSTSAFE - acquires mplock
972 vn_poll(struct file
*fp
, int events
, struct ucred
*cred
)
977 error
= VOP_POLL(((struct vnode
*)fp
->f_data
), events
, cred
);
983 * Check that the vnode is still valid, and if so
984 * acquire requested lock.
988 vn_lock(struct vnode
*vp
, int flags
)
990 debug_vn_lock(struct vnode
*vp
, int flags
, const char *filename
, int line
)
997 vp
->filename
= filename
;
999 error
= debuglockmgr(&vp
->v_lock
, flags
,
1000 "vn_lock", filename
, line
);
1002 error
= lockmgr(&vp
->v_lock
, flags
);
1006 } while (flags
& LK_RETRY
);
1009 * Because we (had better!) have a ref on the vnode, once it
1010 * goes to VRECLAIMED state it will not be recycled until all
1011 * refs go away. So we can just check the flag.
1013 if (error
== 0 && (vp
->v_flag
& VRECLAIMED
)) {
1014 lockmgr(&vp
->v_lock
, LK_RELEASE
);
1021 vn_unlock(struct vnode
*vp
)
1023 lockmgr(&vp
->v_lock
, LK_RELEASE
);
1027 vn_islocked(struct vnode
*vp
)
1029 return (lockstatus(&vp
->v_lock
, curthread
));
1033 * MPALMOSTSAFE - acquires mplock
1036 vn_closefile(struct file
*fp
)
1041 fp
->f_ops
= &badfileops
;
1042 error
= vn_close(((struct vnode
*)fp
->f_data
), fp
->f_flag
);
1048 * MPALMOSTSAFE - acquires mplock
1051 vn_kqfilter(struct file
*fp
, struct knote
*kn
)
1056 error
= VOP_KQFILTER(((struct vnode
*)fp
->f_data
), kn
);