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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/syslog.h>
59 static int vn_closefile (struct file
*fp
);
60 static int vn_ioctl (struct file
*fp
, u_long com
, caddr_t data
,
62 static int vn_read (struct file
*fp
, struct uio
*uio
,
63 struct ucred
*cred
, int flags
);
64 static int svn_read (struct file
*fp
, struct uio
*uio
,
65 struct ucred
*cred
, int flags
);
66 static int vn_poll (struct file
*fp
, int events
, struct ucred
*cred
);
67 static int vn_kqfilter (struct file
*fp
, struct knote
*kn
);
68 static int vn_statfile (struct file
*fp
, struct stat
*sb
, struct ucred
*cred
);
69 static int vn_write (struct file
*fp
, struct uio
*uio
,
70 struct ucred
*cred
, int flags
);
71 static int svn_write (struct file
*fp
, struct uio
*uio
,
72 struct ucred
*cred
, int flags
);
74 struct fileops vnode_fileops
= {
79 .fo_kqfilter
= vn_kqfilter
,
80 .fo_stat
= vn_statfile
,
81 .fo_close
= vn_closefile
,
82 .fo_shutdown
= nofo_shutdown
85 struct fileops specvnode_fileops
= {
87 .fo_write
= svn_write
,
90 .fo_kqfilter
= vn_kqfilter
,
91 .fo_stat
= vn_statfile
,
92 .fo_close
= vn_closefile
,
93 .fo_shutdown
= nofo_shutdown
97 * Shortcut the device read/write. This avoids a lot of vnode junk.
98 * Basically the specfs vnops for read and write take the locked vnode,
99 * unlock it (because we can't hold the vnode locked while reading or writing
100 * a device which may block indefinitely), issues the device operation, then
101 * relock the vnode before returning, plus other junk. This bypasses all
102 * of that and just does the device operation.
105 vn_setspecops(struct file
*fp
)
107 if (vfs_fastdev
&& fp
->f_ops
== &vnode_fileops
) {
108 fp
->f_ops
= &specvnode_fileops
;
113 * Common code for vnode open operations. Check permissions, and call
114 * the VOP_NOPEN or VOP_NCREATE routine.
116 * The caller is responsible for setting up nd with nlookup_init() and
117 * for cleaning it up with nlookup_done(), whether we return an error
120 * On success nd->nl_open_vp will hold a referenced and, if requested,
121 * locked vnode. A locked vnode is requested via NLC_LOCKVP. If fp
122 * is non-NULL the vnode will be installed in the file pointer.
124 * NOTE: The vnode is referenced just once on return whether or not it
125 * is also installed in the file pointer.
128 vn_open(struct nlookupdata
*nd
, struct file
*fp
, int fmode
, int cmode
)
131 struct ucred
*cred
= nd
->nl_cred
;
133 struct vattr
*vap
= &vat
;
137 * Certain combinations are illegal
139 if ((fmode
& (FWRITE
| O_TRUNC
)) == O_TRUNC
)
143 * Lookup the path and create or obtain the vnode. After a
144 * successful lookup a locked nd->nl_nch will be returned.
146 * The result of this section should be a locked vnode.
148 * XXX with only a little work we should be able to avoid locking
149 * the vnode if FWRITE, O_CREAT, and O_TRUNC are *not* set.
151 nd
->nl_flags
|= NLC_OPEN
;
152 if (fmode
& O_APPEND
)
153 nd
->nl_flags
|= NLC_APPEND
;
155 nd
->nl_flags
|= NLC_TRUNCATE
;
157 nd
->nl_flags
|= NLC_READ
;
159 nd
->nl_flags
|= NLC_WRITE
;
160 if ((fmode
& O_EXCL
) == 0 && (fmode
& O_NOFOLLOW
) == 0)
161 nd
->nl_flags
|= NLC_FOLLOW
;
163 if (fmode
& O_CREAT
) {
165 * CONDITIONAL CREATE FILE CASE
167 * Setting NLC_CREATE causes a negative hit to store
168 * the negative hit ncp and not return an error. Then
169 * nc_error or nc_vp may be checked to see if the ncp
170 * represents a negative hit. NLC_CREATE also requires
171 * write permission on the governing directory or EPERM
174 nd
->nl_flags
|= NLC_CREATE
;
175 nd
->nl_flags
|= NLC_REFDVP
;
180 * NORMAL OPEN FILE CASE
189 * split case to allow us to re-resolve and retry the ncp in case
193 if (fmode
& O_CREAT
) {
194 if (nd
->nl_nch
.ncp
->nc_vp
== NULL
) {
195 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
199 vap
->va_mode
= cmode
;
201 vap
->va_vaflags
|= VA_EXCLUSIVE
;
202 error
= VOP_NCREATE(&nd
->nl_nch
, nd
->nl_dvp
, &vp
,
207 /* locked vnode is returned */
209 if (fmode
& O_EXCL
) {
212 error
= cache_vget(&nd
->nl_nch
, cred
,
220 error
= cache_vget(&nd
->nl_nch
, cred
, LK_EXCLUSIVE
, &vp
);
226 * We have a locked vnode and ncp now. Note that the ncp will
227 * be cleaned up by the caller if nd->nl_nch is left intact.
229 if (vp
->v_type
== VLNK
) {
233 if (vp
->v_type
== VSOCK
) {
237 if ((fmode
& O_CREAT
) == 0) {
238 if (fmode
& (FWRITE
| O_TRUNC
)) {
239 if (vp
->v_type
== VDIR
) {
243 error
= vn_writechk(vp
, &nd
->nl_nch
);
246 * Special stale handling, re-resolve the
249 if (error
== ESTALE
) {
252 cache_setunresolved(&nd
->nl_nch
);
253 error
= cache_resolve(&nd
->nl_nch
, cred
);
261 if (fmode
& O_TRUNC
) {
262 vn_unlock(vp
); /* XXX */
263 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
); /* XXX */
266 error
= VOP_SETATTR(vp
, vap
, cred
);
272 * Setup the fp so VOP_OPEN can override it. No descriptor has been
273 * associated with the fp yet so we own it clean.
275 * f_nchandle inherits nl_nch. This used to be necessary only for
276 * directories but now we do it unconditionally so f*() ops
277 * such as fchmod() can access the actual namespace that was
278 * used to open the file.
281 if (nd
->nl_flags
& NLC_APPENDONLY
)
282 fmode
|= FAPPENDONLY
;
283 fp
->f_nchandle
= nd
->nl_nch
;
284 cache_zero(&nd
->nl_nch
);
285 cache_unlock(&fp
->f_nchandle
);
289 * Get rid of nl_nch. vn_open does not return it (it returns the
290 * vnode or the file pointer). Note: we can't leave nl_nch locked
291 * through the VOP_OPEN anyway since the VOP_OPEN may block, e.g.
295 cache_put(&nd
->nl_nch
);
297 error
= VOP_OPEN(vp
, fmode
, cred
, fp
);
300 * setting f_ops to &badfileops will prevent the descriptor
301 * code from trying to close and release the vnode, since
302 * the open failed we do not want to call close.
306 fp
->f_ops
= &badfileops
;
313 * Assert that VREG files have been setup for vmio.
315 KASSERT(vp
->v_type
!= VREG
|| vp
->v_object
!= NULL
,
316 ("vn_open: regular file was not VMIO enabled!"));
320 * Return the vnode. XXX needs some cleaning up. The vnode is
321 * only returned in the fp == NULL case.
325 nd
->nl_vp_fmode
= fmode
;
326 if ((nd
->nl_flags
& NLC_LOCKVP
) == 0)
339 vn_opendisk(const char *devname
, int fmode
, struct vnode
**vpp
)
344 if (strncmp(devname
, "/dev/", 5) == 0)
346 if ((vp
= getsynthvnode(devname
)) == NULL
) {
349 error
= VOP_OPEN(vp
, fmode
, proc0
.p_ucred
, NULL
);
361 * Check for write permissions on the specified vnode. nch may be NULL.
364 vn_writechk(struct vnode
*vp
, struct nchandle
*nch
)
367 * If there's shared text associated with
368 * the vnode, try to free it up once. If
369 * we fail, we can't allow writing.
371 if (vp
->v_flag
& VTEXT
)
375 * If the vnode represents a regular file, check the mount
376 * point via the nch. This may be a different mount point
377 * then the one embedded in the vnode (e.g. nullfs).
379 * We can still write to non-regular files (e.g. devices)
380 * via read-only mounts.
382 if (nch
&& nch
->ncp
&& vp
->v_type
== VREG
)
383 return (ncp_writechk(nch
));
388 * Check whether the underlying mount is read-only. The mount point
389 * referenced by the namecache may be different from the mount point
390 * used by the underlying vnode in the case of NULLFS, so a separate
394 ncp_writechk(struct nchandle
*nch
)
396 if (nch
->mount
&& (nch
->mount
->mnt_flag
& MNT_RDONLY
))
405 vn_close(struct vnode
*vp
, int flags
)
409 error
= vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
411 error
= VOP_CLOSE(vp
, flags
);
420 sequential_heuristic(struct uio
*uio
, struct file
*fp
)
423 * Sequential heuristic - detect sequential operation
425 if ((uio
->uio_offset
== 0 && fp
->f_seqcount
> 0) ||
426 uio
->uio_offset
== fp
->f_nextoff
) {
427 int tmpseq
= fp
->f_seqcount
;
429 * XXX we assume that the filesystem block size is
430 * the default. Not true, but still gives us a pretty
431 * good indicator of how sequential the read operations
434 tmpseq
+= (uio
->uio_resid
+ BKVASIZE
- 1) / BKVASIZE
;
435 if (tmpseq
> IO_SEQMAX
)
437 fp
->f_seqcount
= tmpseq
;
438 return(fp
->f_seqcount
<< IO_SEQSHIFT
);
442 * Not sequential, quick draw-down of seqcount
444 if (fp
->f_seqcount
> 1)
452 * Package up an I/O request on a vnode into a uio and do it.
455 vn_rdwr(enum uio_rw rw
, struct vnode
*vp
, caddr_t base
, int len
,
456 off_t offset
, enum uio_seg segflg
, int ioflg
,
457 struct ucred
*cred
, int *aresid
)
461 struct ccms_lock ccms_lock
;
464 if ((ioflg
& IO_NODELOCKED
) == 0)
465 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
466 auio
.uio_iov
= &aiov
;
468 aiov
.iov_base
= base
;
470 auio
.uio_resid
= len
;
471 auio
.uio_offset
= offset
;
472 auio
.uio_segflg
= segflg
;
474 auio
.uio_td
= curthread
;
475 ccms_lock_get_uio(&vp
->v_ccms
, &ccms_lock
, &auio
);
476 if (rw
== UIO_READ
) {
477 error
= VOP_READ(vp
, &auio
, ioflg
, cred
);
479 error
= VOP_WRITE(vp
, &auio
, ioflg
, cred
);
481 ccms_lock_put(&vp
->v_ccms
, &ccms_lock
);
483 *aresid
= auio
.uio_resid
;
485 if (auio
.uio_resid
&& error
== 0)
487 if ((ioflg
& IO_NODELOCKED
) == 0)
493 * Package up an I/O request on a vnode into a uio and do it. The I/O
494 * request is split up into smaller chunks and we try to avoid saturating
495 * the buffer cache while potentially holding a vnode locked, so we
496 * check bwillwrite() before calling vn_rdwr(). We also call uio_yield()
497 * to give other processes a chance to lock the vnode (either other processes
498 * core'ing the same binary, or unrelated processes scanning the directory).
501 vn_rdwr_inchunks(enum uio_rw rw
, struct vnode
*vp
, caddr_t base
, int len
,
502 off_t offset
, enum uio_seg segflg
, int ioflg
,
503 struct ucred
*cred
, int *aresid
)
511 * Force `offset' to a multiple of MAXBSIZE except possibly
512 * for the first chunk, so that filesystems only need to
513 * write full blocks except possibly for the first and last
516 chunk
= MAXBSIZE
- (uoff_t
)offset
% MAXBSIZE
;
520 if (vp
->v_type
== VREG
) {
530 error
= vn_rdwr(rw
, vp
, base
, chunk
, offset
, segflg
,
531 ioflg
, cred
, aresid
);
532 len
-= chunk
; /* aresid calc already includes length */
545 * MPALMOSTSAFE - acquires mplock
548 vn_read(struct file
*fp
, struct uio
*uio
, struct ucred
*cred
, int flags
)
550 struct ccms_lock ccms_lock
;
555 KASSERT(uio
->uio_td
== curthread
,
556 ("uio_td %p is not td %p", uio
->uio_td
, curthread
));
557 vp
= (struct vnode
*)fp
->f_data
;
560 if (flags
& O_FBLOCKING
) {
561 /* ioflag &= ~IO_NDELAY; */
562 } else if (flags
& O_FNONBLOCKING
) {
564 } else if (fp
->f_flag
& FNONBLOCK
) {
567 if (flags
& O_FBUFFERED
) {
568 /* ioflag &= ~IO_DIRECT; */
569 } else if (flags
& O_FUNBUFFERED
) {
571 } else if (fp
->f_flag
& O_DIRECT
) {
574 vn_lock(vp
, LK_SHARED
| LK_RETRY
);
575 if ((flags
& O_FOFFSET
) == 0)
576 uio
->uio_offset
= fp
->f_offset
;
577 ioflag
|= sequential_heuristic(uio
, fp
);
579 ccms_lock_get_uio(&vp
->v_ccms
, &ccms_lock
, uio
);
580 error
= VOP_READ(vp
, uio
, ioflag
, cred
);
581 ccms_lock_put(&vp
->v_ccms
, &ccms_lock
);
582 if ((flags
& O_FOFFSET
) == 0)
583 fp
->f_offset
= uio
->uio_offset
;
584 fp
->f_nextoff
= uio
->uio_offset
;
591 * Device-optimized file table vnode read routine.
593 * This bypasses the VOP table and talks directly to the device. Most
594 * filesystems just route to specfs and can make this optimization.
596 * MPALMOSTSAFE - acquires mplock
599 svn_read(struct file
*fp
, struct uio
*uio
, struct ucred
*cred
, int flags
)
607 KASSERT(uio
->uio_td
== curthread
,
608 ("uio_td %p is not td %p", uio
->uio_td
, curthread
));
610 vp
= (struct vnode
*)fp
->f_data
;
611 if (vp
== NULL
|| vp
->v_type
== VBAD
) {
616 if ((dev
= vp
->v_rdev
) == NULL
) {
622 if (uio
->uio_resid
== 0) {
626 if ((flags
& O_FOFFSET
) == 0)
627 uio
->uio_offset
= fp
->f_offset
;
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 ioflag
|= sequential_heuristic(uio
, fp
);
646 error
= dev_dread(dev
, uio
, ioflag
);
649 if ((flags
& O_FOFFSET
) == 0)
650 fp
->f_offset
= uio
->uio_offset
;
651 fp
->f_nextoff
= uio
->uio_offset
;
658 * MPALMOSTSAFE - acquires mplock
661 vn_write(struct file
*fp
, struct uio
*uio
, struct ucred
*cred
, int flags
)
663 struct ccms_lock ccms_lock
;
668 KASSERT(uio
->uio_td
== curthread
,
669 ("uio_td %p is not p %p", uio
->uio_td
, curthread
));
670 vp
= (struct vnode
*)fp
->f_data
;
672 /* VOP_WRITE should handle this now */
673 if (vp
->v_type
== VREG
|| vp
->v_type
== VDATABASE
)
676 vp
= (struct vnode
*)fp
->f_data
; /* XXX needed? */
679 if (vp
->v_type
== VREG
&&
680 ((fp
->f_flag
& O_APPEND
) || (flags
& O_FAPPEND
))) {
684 if (flags
& O_FBLOCKING
) {
685 /* ioflag &= ~IO_NDELAY; */
686 } else if (flags
& O_FNONBLOCKING
) {
688 } else if (fp
->f_flag
& FNONBLOCK
) {
691 if (flags
& O_FBUFFERED
) {
692 /* ioflag &= ~IO_DIRECT; */
693 } else if (flags
& O_FUNBUFFERED
) {
695 } else if (fp
->f_flag
& O_DIRECT
) {
698 if (flags
& O_FASYNCWRITE
) {
699 /* ioflag &= ~IO_SYNC; */
700 } else if (flags
& O_FSYNCWRITE
) {
702 } else if (fp
->f_flag
& O_FSYNC
) {
706 if (vp
->v_mount
&& (vp
->v_mount
->mnt_flag
& MNT_SYNCHRONOUS
))
708 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
709 if ((flags
& O_FOFFSET
) == 0)
710 uio
->uio_offset
= fp
->f_offset
;
711 ioflag
|= sequential_heuristic(uio
, fp
);
712 ccms_lock_get_uio(&vp
->v_ccms
, &ccms_lock
, uio
);
713 error
= VOP_WRITE(vp
, uio
, ioflag
, cred
);
714 ccms_lock_put(&vp
->v_ccms
, &ccms_lock
);
715 if ((flags
& O_FOFFSET
) == 0)
716 fp
->f_offset
= uio
->uio_offset
;
717 fp
->f_nextoff
= uio
->uio_offset
;
724 * Device-optimized file table vnode write routine.
726 * This bypasses the VOP table and talks directly to the device. Most
727 * filesystems just route to specfs and can make this optimization.
729 * MPALMOSTSAFE - acquires mplock
732 svn_write(struct file
*fp
, struct uio
*uio
, struct ucred
*cred
, int flags
)
740 KASSERT(uio
->uio_td
== curthread
,
741 ("uio_td %p is not p %p", uio
->uio_td
, curthread
));
743 vp
= (struct vnode
*)fp
->f_data
;
744 if (vp
== NULL
|| vp
->v_type
== VBAD
) {
748 if (vp
->v_type
== VREG
)
749 bwillwrite(uio
->uio_resid
);
750 vp
= (struct vnode
*)fp
->f_data
; /* XXX needed? */
752 if ((dev
= vp
->v_rdev
) == NULL
) {
758 if ((flags
& O_FOFFSET
) == 0)
759 uio
->uio_offset
= fp
->f_offset
;
762 if (vp
->v_type
== VREG
&&
763 ((fp
->f_flag
& O_APPEND
) || (flags
& O_FAPPEND
))) {
767 if (flags
& O_FBLOCKING
) {
768 /* ioflag &= ~IO_NDELAY; */
769 } else if (flags
& O_FNONBLOCKING
) {
771 } else if (fp
->f_flag
& FNONBLOCK
) {
774 if (flags
& O_FBUFFERED
) {
775 /* ioflag &= ~IO_DIRECT; */
776 } else if (flags
& O_FUNBUFFERED
) {
778 } else if (fp
->f_flag
& O_DIRECT
) {
781 if (flags
& O_FASYNCWRITE
) {
782 /* ioflag &= ~IO_SYNC; */
783 } else if (flags
& O_FSYNCWRITE
) {
785 } else if (fp
->f_flag
& O_FSYNC
) {
789 if (vp
->v_mount
&& (vp
->v_mount
->mnt_flag
& MNT_SYNCHRONOUS
))
791 ioflag
|= sequential_heuristic(uio
, fp
);
793 error
= dev_dwrite(dev
, uio
, ioflag
);
796 if ((flags
& O_FOFFSET
) == 0)
797 fp
->f_offset
= uio
->uio_offset
;
798 fp
->f_nextoff
= uio
->uio_offset
;
805 * MPALMOSTSAFE - acquires mplock
808 vn_statfile(struct file
*fp
, struct stat
*sb
, struct ucred
*cred
)
814 vp
= (struct vnode
*)fp
->f_data
;
815 error
= vn_stat(vp
, sb
, cred
);
821 vn_stat(struct vnode
*vp
, struct stat
*sb
, struct ucred
*cred
)
830 error
= VOP_GETATTR(vp
, vap
);
835 * Zero the spare stat fields
841 * Copy from vattr table
843 if (vap
->va_fsid
!= VNOVAL
)
844 sb
->st_dev
= vap
->va_fsid
;
846 sb
->st_dev
= vp
->v_mount
->mnt_stat
.f_fsid
.val
[0];
847 sb
->st_ino
= vap
->va_fileid
;
849 switch (vap
->va_type
) {
867 /* This is a cosmetic change, symlinks do not have a mode. */
868 if (vp
->v_mount
->mnt_flag
& MNT_NOSYMFOLLOW
)
869 sb
->st_mode
&= ~ACCESSPERMS
; /* 0000 */
871 sb
->st_mode
|= ACCESSPERMS
; /* 0777 */
883 if (vap
->va_nlink
> (nlink_t
)-1)
884 sb
->st_nlink
= (nlink_t
)-1;
886 sb
->st_nlink
= vap
->va_nlink
;
887 sb
->st_uid
= vap
->va_uid
;
888 sb
->st_gid
= vap
->va_gid
;
889 sb
->st_rdev
= makeudev(vap
->va_rmajor
, vap
->va_rminor
);
890 sb
->st_size
= vap
->va_size
;
891 sb
->st_atimespec
= vap
->va_atime
;
892 sb
->st_mtimespec
= vap
->va_mtime
;
893 sb
->st_ctimespec
= vap
->va_ctime
;
896 * A VCHR and VBLK device may track the last access and last modified
897 * time independantly of the filesystem. This is particularly true
898 * because device read and write calls may bypass the filesystem.
900 if (vp
->v_type
== VCHR
|| vp
->v_type
== VBLK
) {
903 if (dev
->si_lastread
) {
904 sb
->st_atimespec
.tv_sec
= dev
->si_lastread
;
905 sb
->st_atimespec
.tv_nsec
= 0;
907 if (dev
->si_lastwrite
) {
908 sb
->st_atimespec
.tv_sec
= dev
->si_lastwrite
;
909 sb
->st_atimespec
.tv_nsec
= 0;
915 * According to www.opengroup.org, the meaning of st_blksize is
916 * "a filesystem-specific preferred I/O block size for this
917 * object. In some filesystem types, this may vary from file
919 * Default to PAGE_SIZE after much discussion.
922 if (vap
->va_type
== VREG
) {
923 sb
->st_blksize
= vap
->va_blocksize
;
924 } else if (vn_isdisk(vp
, NULL
)) {
926 * XXX this is broken. If the device is not yet open (aka
927 * stat() call, aka v_rdev == NULL), how are we supposed
928 * to get a valid block size out of it?
931 if (dev
== NULL
&& vp
->v_type
== VCHR
) {
932 dev
= get_dev(vp
->v_umajor
, vp
->v_uminor
);
934 sb
->st_blksize
= dev
->si_bsize_best
;
935 if (sb
->st_blksize
< dev
->si_bsize_phys
)
936 sb
->st_blksize
= dev
->si_bsize_phys
;
937 if (sb
->st_blksize
< BLKDEV_IOSIZE
)
938 sb
->st_blksize
= BLKDEV_IOSIZE
;
940 sb
->st_blksize
= PAGE_SIZE
;
943 sb
->st_flags
= vap
->va_flags
;
945 error
= priv_check_cred(cred
, PRIV_VFS_GENERATION
, 0);
949 sb
->st_gen
= (u_int32_t
)vap
->va_gen
;
951 sb
->st_blocks
= vap
->va_bytes
/ S_BLKSIZE
;
952 sb
->st_fsmid
= vap
->va_fsmid
;
957 * MPALMOSTSAFE - acquires mplock
960 vn_ioctl(struct file
*fp
, u_long com
, caddr_t data
, struct ucred
*ucred
)
962 struct vnode
*vp
= ((struct vnode
*)fp
->f_data
);
969 switch (vp
->v_type
) {
972 if (com
== FIONREAD
) {
973 error
= VOP_GETATTR(vp
, &vattr
);
976 *(int *)data
= vattr
.va_size
- fp
->f_offset
;
980 if (com
== FIOASYNC
) { /* XXX */
992 if (com
== FIODTYPE
) {
993 if (vp
->v_type
!= VCHR
&& vp
->v_type
!= VBLK
) {
997 *(int *)data
= dev_dflags(vp
->v_rdev
) & D_TYPEMASK
;
1001 error
= VOP_IOCTL(vp
, com
, data
, fp
->f_flag
, ucred
);
1002 if (error
== 0 && com
== TIOCSCTTY
) {
1003 struct proc
*p
= curthread
->td_proc
;
1004 struct session
*sess
;
1011 sess
= p
->p_session
;
1012 /* Do nothing if reassigning same control tty */
1013 if (sess
->s_ttyvp
== vp
) {
1018 /* Get rid of reference to old control tty */
1019 ovp
= sess
->s_ttyvp
;
1032 * MPALMOSTSAFE - acquires mplock
1035 vn_poll(struct file
*fp
, int events
, struct ucred
*cred
)
1040 error
= VOP_POLL(((struct vnode
*)fp
->f_data
), events
, cred
);
1046 * Check that the vnode is still valid, and if so
1047 * acquire requested lock.
1051 vn_lock(struct vnode
*vp
, int flags
)
1053 debug_vn_lock(struct vnode
*vp
, int flags
, const char *filename
, int line
)
1060 vp
->filename
= filename
;
1062 error
= debuglockmgr(&vp
->v_lock
, flags
,
1063 "vn_lock", filename
, line
);
1065 error
= lockmgr(&vp
->v_lock
, flags
);
1069 } while (flags
& LK_RETRY
);
1072 * Because we (had better!) have a ref on the vnode, once it
1073 * goes to VRECLAIMED state it will not be recycled until all
1074 * refs go away. So we can just check the flag.
1076 if (error
== 0 && (vp
->v_flag
& VRECLAIMED
)) {
1077 lockmgr(&vp
->v_lock
, LK_RELEASE
);
1084 vn_unlock(struct vnode
*vp
)
1086 lockmgr(&vp
->v_lock
, LK_RELEASE
);
1090 vn_islocked(struct vnode
*vp
)
1092 return (lockstatus(&vp
->v_lock
, curthread
));
1096 * MPALMOSTSAFE - acquires mplock
1099 vn_closefile(struct file
*fp
)
1104 fp
->f_ops
= &badfileops
;
1105 error
= vn_close(((struct vnode
*)fp
->f_data
), fp
->f_flag
);
1111 * MPALMOSTSAFE - acquires mplock
1114 vn_kqfilter(struct file
*fp
, struct knote
*kn
)
1119 error
= VOP_KQFILTER(((struct vnode
*)fp
->f_data
), kn
);