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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>
61 #include <sys/mplock2.h>
63 static int vn_closefile (struct file *fp);
64 static int vn_ioctl (struct file *fp, u_long com, caddr_t data,
65 struct ucred *cred, struct sysmsg *msg);
66 static int vn_read (struct file *fp, struct uio *uio,
67 struct ucred *cred, int flags);
68 static int vn_poll (struct file *fp, int events, struct ucred *cred);
69 static int vn_kqfilter (struct file *fp, struct knote *kn);
70 static int vn_statfile (struct file *fp, struct stat *sb, struct ucred *cred);
71 static int vn_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
86 * Common code for vnode open operations. Check permissions, and call
87 * the VOP_NOPEN or VOP_NCREATE routine.
89 * The caller is responsible for setting up nd with nlookup_init() and
90 * for cleaning it up with nlookup_done(), whether we return an error
93 * On success nd->nl_open_vp will hold a referenced and, if requested,
94 * locked vnode. A locked vnode is requested via NLC_LOCKVP. If fp
95 * is non-NULL the vnode will be installed in the file pointer.
97 * NOTE: The vnode is referenced just once on return whether or not it
98 * is also installed in the file pointer.
101 vn_open(struct nlookupdata *nd, struct file *fp, int fmode, int cmode)
104 struct ucred *cred = nd->nl_cred;
106 struct vattr *vap = &vat;
111 * Certain combinations are illegal
113 if ((fmode & (FWRITE | O_TRUNC)) == O_TRUNC)
117 * Lookup the path and create or obtain the vnode. After a
118 * successful lookup a locked nd->nl_nch will be returned.
120 * The result of this section should be a locked vnode.
122 * XXX with only a little work we should be able to avoid locking
123 * the vnode if FWRITE, O_CREAT, and O_TRUNC are *not* set.
125 nd->nl_flags |= NLC_OPEN;
126 if (fmode & O_APPEND)
127 nd->nl_flags |= NLC_APPEND;
129 nd->nl_flags |= NLC_TRUNCATE;
131 nd->nl_flags |= NLC_READ;
133 nd->nl_flags |= NLC_WRITE;
134 if ((fmode & O_EXCL) == 0 && (fmode & O_NOFOLLOW) == 0)
135 nd->nl_flags |= NLC_FOLLOW;
137 if (fmode & O_CREAT) {
139 * CONDITIONAL CREATE FILE CASE
141 * Setting NLC_CREATE causes a negative hit to store
142 * the negative hit ncp and not return an error. Then
143 * nc_error or nc_vp may be checked to see if the ncp
144 * represents a negative hit. NLC_CREATE also requires
145 * write permission on the governing directory or EPERM
148 nd->nl_flags |= NLC_CREATE;
149 nd->nl_flags |= NLC_REFDVP;
154 * NORMAL OPEN FILE CASE
163 * split case to allow us to re-resolve and retry the ncp in case
167 if (fmode & O_CREAT) {
168 if (nd->nl_nch.ncp->nc_vp == NULL) {
169 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
173 vap->va_mode = cmode;
175 vap->va_vaflags |= VA_EXCLUSIVE;
176 error = VOP_NCREATE(&nd->nl_nch, nd->nl_dvp, &vp,
181 /* locked vnode is returned */
183 if (fmode & O_EXCL) {
186 error = cache_vget(&nd->nl_nch, cred,
194 error = cache_vget(&nd->nl_nch, cred, LK_EXCLUSIVE, &vp);
200 * We have a locked vnode and ncp now. Note that the ncp will
201 * be cleaned up by the caller if nd->nl_nch is left intact.
203 if (vp->v_type == VLNK) {
207 if (vp->v_type == VSOCK) {
211 if ((fmode & O_CREAT) == 0) {
212 if (fmode & (FWRITE | O_TRUNC)) {
213 if (vp->v_type == VDIR) {
217 error = vn_writechk(vp, &nd->nl_nch);
220 * Special stale handling, re-resolve the
223 if (error == ESTALE) {
226 cache_setunresolved(&nd->nl_nch);
227 error = cache_resolve(&nd->nl_nch, cred);
235 if (fmode & O_TRUNC) {
236 vn_unlock(vp); /* XXX */
237 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */
240 error = VOP_SETATTR(vp, vap, cred);
246 * Set or clear VNSWAPCACHE on the vp based on nd->nl_nch.ncp->nc_flag.
247 * These particular bits a tracked all the way from the root.
249 * NOTE: Might not work properly on NFS servers due to the
250 * disconnected namecache.
252 flags = nd->nl_nch.ncp->nc_flag;
253 if ((flags & (NCF_UF_CACHE | NCF_UF_PCACHE)) &&
254 (flags & (NCF_SF_NOCACHE | NCF_SF_PNOCACHE)) == 0) {
255 vsetflags(vp, VSWAPCACHE);
257 vclrflags(vp, VSWAPCACHE);
261 * Setup the fp so VOP_OPEN can override it. No descriptor has been
262 * associated with the fp yet so we own it clean.
264 * f_nchandle inherits nl_nch. This used to be necessary only for
265 * directories but now we do it unconditionally so f*() ops
266 * such as fchmod() can access the actual namespace that was
267 * used to open the file.
270 if (nd->nl_flags & NLC_APPENDONLY)
271 fmode |= FAPPENDONLY;
272 fp->f_nchandle = nd->nl_nch;
273 cache_zero(&nd->nl_nch);
274 cache_unlock(&fp->f_nchandle);
278 * Get rid of nl_nch. vn_open does not return it (it returns the
279 * vnode or the file pointer). Note: we can't leave nl_nch locked
280 * through the VOP_OPEN anyway since the VOP_OPEN may block, e.g.
284 cache_put(&nd->nl_nch);
286 error = VOP_OPEN(vp, fmode, cred, fp);
289 * setting f_ops to &badfileops will prevent the descriptor
290 * code from trying to close and release the vnode, since
291 * the open failed we do not want to call close.
295 fp->f_ops = &badfileops;
302 * Assert that VREG files have been setup for vmio.
304 KASSERT(vp->v_type != VREG || vp->v_object != NULL,
305 ("vn_open: regular file was not VMIO enabled!"));
309 * Return the vnode. XXX needs some cleaning up. The vnode is
310 * only returned in the fp == NULL case.
314 nd->nl_vp_fmode = fmode;
315 if ((nd->nl_flags & NLC_LOCKVP) == 0)
328 vn_opendisk(const char *devname, int fmode, struct vnode **vpp)
333 if (strncmp(devname, "/dev/", 5) == 0)
335 if ((vp = getsynthvnode(devname)) == NULL) {
338 error = VOP_OPEN(vp, fmode, proc0.p_ucred, NULL);
350 * Check for write permissions on the specified vnode. nch may be NULL.
353 vn_writechk(struct vnode *vp, struct nchandle *nch)
356 * If there's shared text associated with
357 * the vnode, try to free it up once. If
358 * we fail, we can't allow writing.
360 if (vp->v_flag & VTEXT)
364 * If the vnode represents a regular file, check the mount
365 * point via the nch. This may be a different mount point
366 * then the one embedded in the vnode (e.g. nullfs).
368 * We can still write to non-regular files (e.g. devices)
369 * via read-only mounts.
371 if (nch && nch->ncp && vp->v_type == VREG)
372 return (ncp_writechk(nch));
377 * Check whether the underlying mount is read-only. The mount point
378 * referenced by the namecache may be different from the mount point
379 * used by the underlying vnode in the case of NULLFS, so a separate
383 ncp_writechk(struct nchandle *nch)
385 if (nch->mount && (nch->mount->mnt_flag & MNT_RDONLY))
396 vn_close(struct vnode *vp, int flags)
400 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
402 error = VOP_CLOSE(vp, flags);
410 * Sequential heuristic.
412 * MPSAFE (f_seqcount and f_nextoff are allowed to race)
416 sequential_heuristic(struct uio *uio, struct file *fp)
419 * Sequential heuristic - detect sequential operation
421 * NOTE: SMP: We allow f_seqcount updates to race.
423 if ((uio->uio_offset == 0 && fp->f_seqcount > 0) ||
424 uio->uio_offset == fp->f_nextoff) {
425 int tmpseq = fp->f_seqcount;
427 tmpseq += (uio->uio_resid + BKVASIZE - 1) / BKVASIZE;
428 if (tmpseq > IO_SEQMAX)
430 fp->f_seqcount = tmpseq;
431 return(fp->f_seqcount << IO_SEQSHIFT);
435 * Not sequential, quick draw-down of seqcount
437 * NOTE: SMP: We allow f_seqcount updates to race.
439 if (fp->f_seqcount > 1)
447 * get - lock and return the f_offset field.
448 * set - set and unlock the f_offset field.
450 * These routines serve the dual purpose of serializing access to the
451 * f_offset field (at least on i386) and guaranteeing operational integrity
452 * when multiple read()ers and write()ers are present on the same fp.
456 static __inline off_t
457 vn_get_fpf_offset(struct file *fp)
463 * Shortcut critical path.
465 flags = fp->f_flag & ~FOFFSETLOCK;
466 if (atomic_cmpset_int(&fp->f_flag, flags, flags | FOFFSETLOCK))
467 return(fp->f_offset);
474 if (flags & FOFFSETLOCK) {
475 nflags = flags | FOFFSETWAKE;
476 tsleep_interlock(&fp->f_flag, 0);
477 if (atomic_cmpset_int(&fp->f_flag, flags, nflags))
478 tsleep(&fp->f_flag, PINTERLOCKED, "fpoff", 0);
480 nflags = flags | FOFFSETLOCK;
481 if (atomic_cmpset_int(&fp->f_flag, flags, nflags))
485 return(fp->f_offset);
492 vn_set_fpf_offset(struct file *fp, off_t offset)
498 * We hold the lock so we can set the offset without interference.
500 fp->f_offset = offset;
503 * Normal release is already a reasonably critical path.
507 nflags = flags & ~(FOFFSETLOCK | FOFFSETWAKE);
508 if (atomic_cmpset_int(&fp->f_flag, flags, nflags)) {
509 if (flags & FOFFSETWAKE)
519 static __inline off_t
520 vn_poll_fpf_offset(struct file *fp)
522 #if defined(__x86_64__) || !defined(SMP)
523 return(fp->f_offset);
525 off_t off = vn_get_fpf_offset(fp);
526 vn_set_fpf_offset(fp, off);
532 * Package up an I/O request on a vnode into a uio and do it.
537 vn_rdwr(enum uio_rw rw, struct vnode *vp, caddr_t base, int len,
538 off_t offset, enum uio_seg segflg, int ioflg,
539 struct ucred *cred, int *aresid)
543 struct ccms_lock ccms_lock;
546 if ((ioflg & IO_NODELOCKED) == 0)
547 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
548 auio.uio_iov = &aiov;
550 aiov.iov_base = base;
552 auio.uio_resid = len;
553 auio.uio_offset = offset;
554 auio.uio_segflg = segflg;
556 auio.uio_td = curthread;
557 ccms_lock_get_uio(&vp->v_ccms, &ccms_lock, &auio);
558 if (rw == UIO_READ) {
559 error = VOP_READ(vp, &auio, ioflg, cred);
561 error = VOP_WRITE(vp, &auio, ioflg, cred);
563 ccms_lock_put(&vp->v_ccms, &ccms_lock);
565 *aresid = auio.uio_resid;
567 if (auio.uio_resid && error == 0)
569 if ((ioflg & IO_NODELOCKED) == 0)
575 * Package up an I/O request on a vnode into a uio and do it. The I/O
576 * request is split up into smaller chunks and we try to avoid saturating
577 * the buffer cache while potentially holding a vnode locked, so we
578 * check bwillwrite() before calling vn_rdwr(). We also call uio_yield()
579 * to give other processes a chance to lock the vnode (either other processes
580 * core'ing the same binary, or unrelated processes scanning the directory).
585 vn_rdwr_inchunks(enum uio_rw rw, struct vnode *vp, caddr_t base, int len,
586 off_t offset, enum uio_seg segflg, int ioflg,
587 struct ucred *cred, int *aresid)
595 * Force `offset' to a multiple of MAXBSIZE except possibly
596 * for the first chunk, so that filesystems only need to
597 * write full blocks except possibly for the first and last
600 chunk = MAXBSIZE - (uoff_t)offset % MAXBSIZE;
604 if (vp->v_type == VREG) {
614 error = vn_rdwr(rw, vp, base, chunk, offset, segflg,
615 ioflg, cred, aresid);
616 len -= chunk; /* aresid calc already includes length */
629 * File pointers can no longer get ripped up by revoke so
630 * we don't need to lock access to the vp.
632 * f_offset updates are not guaranteed against multiple readers
637 vn_read(struct file *fp, struct uio *uio, struct ucred *cred, int flags)
639 struct ccms_lock ccms_lock;
643 KASSERT(uio->uio_td == curthread,
644 ("uio_td %p is not td %p", uio->uio_td, curthread));
645 vp = (struct vnode *)fp->f_data;
648 if (flags & O_FBLOCKING) {
649 /* ioflag &= ~IO_NDELAY; */
650 } else if (flags & O_FNONBLOCKING) {
652 } else if (fp->f_flag & FNONBLOCK) {
655 if (flags & O_FBUFFERED) {
656 /* ioflag &= ~IO_DIRECT; */
657 } else if (flags & O_FUNBUFFERED) {
659 } else if (fp->f_flag & O_DIRECT) {
662 if ((flags & O_FOFFSET) == 0 && (vp->v_flag & VNOTSEEKABLE) == 0)
663 uio->uio_offset = vn_get_fpf_offset(fp);
664 vn_lock(vp, LK_SHARED | LK_RETRY);
665 ioflag |= sequential_heuristic(uio, fp);
667 ccms_lock_get_uio(&vp->v_ccms, &ccms_lock, uio);
668 error = VOP_READ(vp, uio, ioflag, cred);
669 ccms_lock_put(&vp->v_ccms, &ccms_lock);
670 fp->f_nextoff = uio->uio_offset;
672 if ((flags & O_FOFFSET) == 0 && (vp->v_flag & VNOTSEEKABLE) == 0)
673 vn_set_fpf_offset(fp, uio->uio_offset);
681 vn_write(struct file *fp, struct uio *uio, struct ucred *cred, int flags)
683 struct ccms_lock ccms_lock;
687 KASSERT(uio->uio_td == curthread,
688 ("uio_td %p is not p %p", uio->uio_td, curthread));
689 vp = (struct vnode *)fp->f_data;
692 if (vp->v_type == VREG &&
693 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) {
697 if (flags & O_FBLOCKING) {
698 /* ioflag &= ~IO_NDELAY; */
699 } else if (flags & O_FNONBLOCKING) {
701 } else if (fp->f_flag & FNONBLOCK) {
704 if (flags & O_FBUFFERED) {
705 /* ioflag &= ~IO_DIRECT; */
706 } else if (flags & O_FUNBUFFERED) {
708 } else if (fp->f_flag & O_DIRECT) {
711 if (flags & O_FASYNCWRITE) {
712 /* ioflag &= ~IO_SYNC; */
713 } else if (flags & O_FSYNCWRITE) {
715 } else if (fp->f_flag & O_FSYNC) {
719 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))
721 if ((flags & O_FOFFSET) == 0)
722 uio->uio_offset = vn_get_fpf_offset(fp);
723 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
724 ioflag |= sequential_heuristic(uio, fp);
725 ccms_lock_get_uio(&vp->v_ccms, &ccms_lock, uio);
726 error = VOP_WRITE(vp, uio, ioflag, cred);
727 ccms_lock_put(&vp->v_ccms, &ccms_lock);
728 fp->f_nextoff = uio->uio_offset;
730 if ((flags & O_FOFFSET) == 0)
731 vn_set_fpf_offset(fp, uio->uio_offset);
739 vn_statfile(struct file *fp, struct stat *sb, struct ucred *cred)
744 vp = (struct vnode *)fp->f_data;
745 error = vn_stat(vp, sb, cred);
753 vn_stat(struct vnode *vp, struct stat *sb, struct ucred *cred)
762 error = VOP_GETATTR(vp, vap);
767 * Zero the spare stat fields
774 * Copy from vattr table
776 if (vap->va_fsid != VNOVAL)
777 sb->st_dev = vap->va_fsid;
779 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0];
780 sb->st_ino = vap->va_fileid;
782 switch (vap->va_type) {
800 /* This is a cosmetic change, symlinks do not have a mode. */
801 if (vp->v_mount->mnt_flag & MNT_NOSYMFOLLOW)
802 sb->st_mode &= ~ACCESSPERMS; /* 0000 */
804 sb->st_mode |= ACCESSPERMS; /* 0777 */
816 if (vap->va_nlink > (nlink_t)-1)
817 sb->st_nlink = (nlink_t)-1;
819 sb->st_nlink = vap->va_nlink;
820 sb->st_uid = vap->va_uid;
821 sb->st_gid = vap->va_gid;
822 sb->st_rdev = dev2udev(vp->v_rdev);
823 sb->st_size = vap->va_size;
824 sb->st_atimespec = vap->va_atime;
825 sb->st_mtimespec = vap->va_mtime;
826 sb->st_ctimespec = vap->va_ctime;
829 * A VCHR and VBLK device may track the last access and last modified
830 * time independantly of the filesystem. This is particularly true
831 * because device read and write calls may bypass the filesystem.
833 if (vp->v_type == VCHR || vp->v_type == VBLK) {
836 if (dev->si_lastread) {
837 sb->st_atimespec.tv_sec = dev->si_lastread;
838 sb->st_atimespec.tv_nsec = 0;
840 if (dev->si_lastwrite) {
841 sb->st_atimespec.tv_sec = dev->si_lastwrite;
842 sb->st_atimespec.tv_nsec = 0;
848 * According to www.opengroup.org, the meaning of st_blksize is
849 * "a filesystem-specific preferred I/O block size for this
850 * object. In some filesystem types, this may vary from file
852 * Default to PAGE_SIZE after much discussion.
855 if (vap->va_type == VREG) {
856 sb->st_blksize = vap->va_blocksize;
857 } else if (vn_isdisk(vp, NULL)) {
859 * XXX this is broken. If the device is not yet open (aka
860 * stat() call, aka v_rdev == NULL), how are we supposed
861 * to get a valid block size out of it?
865 sb->st_blksize = dev->si_bsize_best;
866 if (sb->st_blksize < dev->si_bsize_phys)
867 sb->st_blksize = dev->si_bsize_phys;
868 if (sb->st_blksize < BLKDEV_IOSIZE)
869 sb->st_blksize = BLKDEV_IOSIZE;
871 sb->st_blksize = PAGE_SIZE;
874 sb->st_flags = vap->va_flags;
876 error = priv_check_cred(cred, PRIV_VFS_GENERATION, 0);
880 sb->st_gen = (u_int32_t)vap->va_gen;
882 sb->st_blocks = vap->va_bytes / S_BLKSIZE;
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);
899 switch (vp->v_type) {
902 if (com == FIONREAD) {
903 error = VOP_GETATTR(vp, &vattr);
906 size = vattr.va_size;
907 if ((vp->v_flag & VNOTSEEKABLE) == 0)
908 size -= vn_poll_fpf_offset(fp);
909 if (size > 0x7FFFFFFF)
915 if (com == FIOASYNC) { /* XXX */
927 if (com == FIODTYPE) {
928 if (vp->v_type != VCHR && vp->v_type != VBLK) {
932 *(int *)data = dev_dflags(vp->v_rdev) & D_TYPEMASK;
936 error = VOP_IOCTL(vp, com, data, fp->f_flag, ucred, msg);
937 if (error == 0 && com == TIOCSCTTY) {
938 struct proc *p = curthread->td_proc;
939 struct session *sess;
948 /* Do nothing if reassigning same control tty */
949 if (sess->s_ttyvp == vp) {
955 /* Get rid of reference to old control tty */
972 vn_poll(struct file *fp, int events, struct ucred *cred)
976 error = VOP_POLL(((struct vnode *)fp->f_data), events, cred);
981 * Check that the vnode is still valid, and if so
982 * acquire requested lock.
986 vn_lock(struct vnode *vp, int flags)
988 debug_vn_lock(struct vnode *vp, int flags, const char *filename, int line)
995 vp->filename = filename;
997 error = debuglockmgr(&vp->v_lock, flags,
998 "vn_lock", filename, line);
1000 error = lockmgr(&vp->v_lock, flags);
1004 } while (flags & LK_RETRY);
1007 * Because we (had better!) have a ref on the vnode, once it
1008 * goes to VRECLAIMED state it will not be recycled until all
1009 * refs go away. So we can just check the flag.
1011 if (error == 0 && (vp->v_flag & VRECLAIMED)) {
1012 lockmgr(&vp->v_lock, LK_RELEASE);
1022 vn_unlock(struct vnode *vp)
1024 lockmgr(&vp->v_lock, LK_RELEASE);
1031 vn_islocked(struct vnode *vp)
1033 return (lockstatus(&vp->v_lock, curthread));
1037 * Return the lock status of a vnode and unlock the vnode
1038 * if we owned the lock. This is not a boolean, if the
1039 * caller cares what the lock status is the caller must
1040 * check the various possible values.
1042 * This only unlocks exclusive locks held by the caller,
1043 * it will NOT unlock shared locks (there is no way to
1044 * tell who the shared lock belongs to).
1049 vn_islocked_unlock(struct vnode *vp)
1053 vpls = lockstatus(&vp->v_lock, curthread);
1054 if (vpls == LK_EXCLUSIVE)
1055 lockmgr(&vp->v_lock, LK_RELEASE);
1060 * Restore a vnode lock that we previously released via
1061 * vn_islocked_unlock(). This is a NOP if we did not
1062 * own the original lock.
1067 vn_islocked_relock(struct vnode *vp, int vpls)
1071 if (vpls == LK_EXCLUSIVE)
1072 error = lockmgr(&vp->v_lock, vpls);
1079 vn_closefile(struct file *fp)
1083 fp->f_ops = &badfileops;
1084 error = vn_close(((struct vnode *)fp->f_data), fp->f_flag);
1092 vn_kqfilter(struct file *fp, struct knote *kn)
1096 error = VOP_KQFILTER(((struct vnode *)fp->f_data), kn);