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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_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);
73 struct fileops vnode_fileops = {
77 .fo_kqfilter = vn_kqfilter,
78 .fo_stat = vn_statfile,
79 .fo_close = vn_closefile,
80 .fo_shutdown = nofo_shutdown
84 * Common code for vnode open operations. Check permissions, and call
85 * the VOP_NOPEN or VOP_NCREATE routine.
87 * The caller is responsible for setting up nd with nlookup_init() and
88 * for cleaning it up with nlookup_done(), whether we return an error
91 * On success nd->nl_open_vp will hold a referenced and, if requested,
92 * locked vnode. A locked vnode is requested via NLC_LOCKVP. If fp
93 * is non-NULL the vnode will be installed in the file pointer.
95 * NOTE: The vnode is referenced just once on return whether or not it
96 * is also installed in the file pointer.
99 vn_open(struct nlookupdata *nd, struct file *fp, int fmode, int cmode)
102 struct ucred *cred = nd->nl_cred;
104 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 (vp->v_type != VDIR && (fmode & O_DIRECTORY)) {
215 if ((fmode & O_CREAT) == 0) {
216 if (fmode & (FWRITE | O_TRUNC)) {
217 if (vp->v_type == VDIR) {
221 error = vn_writechk(vp, &nd->nl_nch);
224 * Special stale handling, re-resolve the
227 if (error == ESTALE) {
230 cache_setunresolved(&nd->nl_nch);
231 error = cache_resolve(&nd->nl_nch, cred);
239 if (fmode & O_TRUNC) {
240 vn_unlock(vp); /* XXX */
241 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */
242 osize = vp->v_filesize;
245 error = VOP_SETATTR(vp, vap, cred);
248 error = VOP_GETATTR(vp, vap);
252 VFS_ACCOUNT(mp, vap->va_uid, vap->va_gid, -osize);
256 * Set or clear VNSWAPCACHE on the vp based on nd->nl_nch.ncp->nc_flag.
257 * These particular bits a tracked all the way from the root.
259 * NOTE: Might not work properly on NFS servers due to the
260 * disconnected namecache.
262 flags = nd->nl_nch.ncp->nc_flag;
263 if ((flags & (NCF_UF_CACHE | NCF_UF_PCACHE)) &&
264 (flags & (NCF_SF_NOCACHE | NCF_SF_PNOCACHE)) == 0) {
265 vsetflags(vp, VSWAPCACHE);
267 vclrflags(vp, VSWAPCACHE);
271 * Setup the fp so VOP_OPEN can override it. No descriptor has been
272 * associated with the fp yet so we own it clean.
274 * f_nchandle inherits nl_nch. This used to be necessary only for
275 * directories but now we do it unconditionally so f*() ops
276 * such as fchmod() can access the actual namespace that was
277 * used to open the file.
280 if (nd->nl_flags & NLC_APPENDONLY)
281 fmode |= FAPPENDONLY;
282 fp->f_nchandle = nd->nl_nch;
283 cache_zero(&nd->nl_nch);
284 cache_unlock(&fp->f_nchandle);
288 * Get rid of nl_nch. vn_open does not return it (it returns the
289 * vnode or the file pointer). Note: we can't leave nl_nch locked
290 * through the VOP_OPEN anyway since the VOP_OPEN may block, e.g.
294 cache_put(&nd->nl_nch);
296 error = VOP_OPEN(vp, fmode, cred, fp);
299 * setting f_ops to &badfileops will prevent the descriptor
300 * code from trying to close and release the vnode, since
301 * the open failed we do not want to call close.
305 fp->f_ops = &badfileops;
312 * Assert that VREG files have been setup for vmio.
314 KASSERT(vp->v_type != VREG || vp->v_object != NULL,
315 ("vn_open: regular file was not VMIO enabled!"));
319 * Return the vnode. XXX needs some cleaning up. The vnode is
320 * only returned in the fp == NULL case.
324 nd->nl_vp_fmode = fmode;
325 if ((nd->nl_flags & NLC_LOCKVP) == 0)
338 vn_opendisk(const char *devname, int fmode, struct vnode **vpp)
343 if (strncmp(devname, "/dev/", 5) == 0)
345 if ((vp = getsynthvnode(devname)) == NULL) {
348 error = VOP_OPEN(vp, fmode, proc0.p_ucred, NULL);
360 * Check for write permissions on the specified vnode. nch may be NULL.
363 vn_writechk(struct vnode *vp, struct nchandle *nch)
366 * If there's shared text associated with
367 * the vnode, try to free it up once. If
368 * we fail, we can't allow writing.
370 if (vp->v_flag & VTEXT)
374 * If the vnode represents a regular file, check the mount
375 * point via the nch. This may be a different mount point
376 * then the one embedded in the vnode (e.g. nullfs).
378 * We can still write to non-regular files (e.g. devices)
379 * via read-only mounts.
381 if (nch && nch->ncp && vp->v_type == VREG)
382 return (ncp_writechk(nch));
387 * Check whether the underlying mount is read-only. The mount point
388 * referenced by the namecache may be different from the mount point
389 * used by the underlying vnode in the case of NULLFS, so a separate
393 ncp_writechk(struct nchandle *nch)
395 if (nch->mount && (nch->mount->mnt_flag & MNT_RDONLY))
406 vn_close(struct vnode *vp, int flags)
410 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
412 error = VOP_CLOSE(vp, flags);
420 * Sequential heuristic.
422 * MPSAFE (f_seqcount and f_nextoff are allowed to race)
426 sequential_heuristic(struct uio *uio, struct file *fp)
429 * Sequential heuristic - detect sequential operation
431 * NOTE: SMP: We allow f_seqcount updates to race.
433 if ((uio->uio_offset == 0 && fp->f_seqcount > 0) ||
434 uio->uio_offset == fp->f_nextoff) {
435 int tmpseq = fp->f_seqcount;
437 tmpseq += (uio->uio_resid + BKVASIZE - 1) / BKVASIZE;
438 if (tmpseq > IO_SEQMAX)
440 fp->f_seqcount = tmpseq;
441 return(fp->f_seqcount << IO_SEQSHIFT);
445 * Not sequential, quick draw-down of seqcount
447 * NOTE: SMP: We allow f_seqcount updates to race.
449 if (fp->f_seqcount > 1)
457 * get - lock and return the f_offset field.
458 * set - set and unlock the f_offset field.
460 * These routines serve the dual purpose of serializing access to the
461 * f_offset field (at least on i386) and guaranteeing operational integrity
462 * when multiple read()ers and write()ers are present on the same fp.
466 static __inline off_t
467 vn_get_fpf_offset(struct file *fp)
473 * Shortcut critical path.
475 flags = fp->f_flag & ~FOFFSETLOCK;
476 if (atomic_cmpset_int(&fp->f_flag, flags, flags | FOFFSETLOCK))
477 return(fp->f_offset);
484 if (flags & FOFFSETLOCK) {
485 nflags = flags | FOFFSETWAKE;
486 tsleep_interlock(&fp->f_flag, 0);
487 if (atomic_cmpset_int(&fp->f_flag, flags, nflags))
488 tsleep(&fp->f_flag, PINTERLOCKED, "fpoff", 0);
490 nflags = flags | FOFFSETLOCK;
491 if (atomic_cmpset_int(&fp->f_flag, flags, nflags))
495 return(fp->f_offset);
502 vn_set_fpf_offset(struct file *fp, off_t offset)
508 * We hold the lock so we can set the offset without interference.
510 fp->f_offset = offset;
513 * Normal release is already a reasonably critical path.
517 nflags = flags & ~(FOFFSETLOCK | FOFFSETWAKE);
518 if (atomic_cmpset_int(&fp->f_flag, flags, nflags)) {
519 if (flags & FOFFSETWAKE)
529 static __inline off_t
530 vn_poll_fpf_offset(struct file *fp)
532 #if defined(__x86_64__) || !defined(SMP)
533 return(fp->f_offset);
535 off_t off = vn_get_fpf_offset(fp);
536 vn_set_fpf_offset(fp, off);
542 * Package up an I/O request on a vnode into a uio and do it.
547 vn_rdwr(enum uio_rw rw, struct vnode *vp, caddr_t base, int len,
548 off_t offset, enum uio_seg segflg, int ioflg,
549 struct ucred *cred, int *aresid)
555 if ((ioflg & IO_NODELOCKED) == 0)
556 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
557 auio.uio_iov = &aiov;
559 aiov.iov_base = base;
561 auio.uio_resid = len;
562 auio.uio_offset = offset;
563 auio.uio_segflg = segflg;
565 auio.uio_td = curthread;
566 if (rw == UIO_READ) {
567 error = VOP_READ(vp, &auio, ioflg, cred);
569 error = VOP_WRITE(vp, &auio, ioflg, cred);
572 *aresid = auio.uio_resid;
574 if (auio.uio_resid && error == 0)
576 if ((ioflg & IO_NODELOCKED) == 0)
582 * Package up an I/O request on a vnode into a uio and do it. The I/O
583 * request is split up into smaller chunks and we try to avoid saturating
584 * the buffer cache while potentially holding a vnode locked, so we
585 * check bwillwrite() before calling vn_rdwr(). We also call lwkt_user_yield()
586 * to give other processes a chance to lock the vnode (either other processes
587 * core'ing the same binary, or unrelated processes scanning the directory).
592 vn_rdwr_inchunks(enum uio_rw rw, struct vnode *vp, caddr_t base, int len,
593 off_t offset, enum uio_seg segflg, int ioflg,
594 struct ucred *cred, int *aresid)
602 * Force `offset' to a multiple of MAXBSIZE except possibly
603 * for the first chunk, so that filesystems only need to
604 * write full blocks except possibly for the first and last
607 chunk = MAXBSIZE - (uoff_t)offset % MAXBSIZE;
611 if (vp->v_type == VREG) {
621 error = vn_rdwr(rw, vp, base, chunk, offset, segflg,
622 ioflg, cred, aresid);
623 len -= chunk; /* aresid calc already includes length */
636 * File pointers can no longer get ripped up by revoke so
637 * we don't need to lock access to the vp.
639 * f_offset updates are not guaranteed against multiple readers
642 vn_read(struct file *fp, struct uio *uio, struct ucred *cred, int flags)
647 KASSERT(uio->uio_td == curthread,
648 ("uio_td %p is not td %p", uio->uio_td, curthread));
649 vp = (struct vnode *)fp->f_data;
652 if (flags & O_FBLOCKING) {
653 /* ioflag &= ~IO_NDELAY; */
654 } else if (flags & O_FNONBLOCKING) {
656 } else if (fp->f_flag & FNONBLOCK) {
659 if (flags & O_FBUFFERED) {
660 /* ioflag &= ~IO_DIRECT; */
661 } else if (flags & O_FUNBUFFERED) {
663 } else if (fp->f_flag & O_DIRECT) {
666 if ((flags & O_FOFFSET) == 0 && (vp->v_flag & VNOTSEEKABLE) == 0)
667 uio->uio_offset = vn_get_fpf_offset(fp);
668 vn_lock(vp, LK_SHARED | LK_RETRY);
669 ioflag |= sequential_heuristic(uio, fp);
671 error = VOP_READ(vp, uio, ioflag, cred);
672 fp->f_nextoff = uio->uio_offset;
674 if ((flags & O_FOFFSET) == 0 && (vp->v_flag & VNOTSEEKABLE) == 0)
675 vn_set_fpf_offset(fp, uio->uio_offset);
683 vn_write(struct file *fp, struct uio *uio, struct ucred *cred, int flags)
688 KASSERT(uio->uio_td == curthread,
689 ("uio_td %p is not p %p", uio->uio_td, curthread));
690 vp = (struct vnode *)fp->f_data;
693 if (vp->v_type == VREG &&
694 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) {
698 if (flags & O_FBLOCKING) {
699 /* ioflag &= ~IO_NDELAY; */
700 } else if (flags & O_FNONBLOCKING) {
702 } else if (fp->f_flag & FNONBLOCK) {
705 if (flags & O_FBUFFERED) {
706 /* ioflag &= ~IO_DIRECT; */
707 } else if (flags & O_FUNBUFFERED) {
709 } else if (fp->f_flag & O_DIRECT) {
712 if (flags & O_FASYNCWRITE) {
713 /* ioflag &= ~IO_SYNC; */
714 } else if (flags & O_FSYNCWRITE) {
716 } else if (fp->f_flag & O_FSYNC) {
720 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))
722 if ((flags & O_FOFFSET) == 0)
723 uio->uio_offset = vn_get_fpf_offset(fp);
724 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
725 ioflag |= sequential_heuristic(uio, fp);
726 error = VOP_WRITE(vp, uio, ioflag, cred);
727 fp->f_nextoff = uio->uio_offset;
729 if ((flags & O_FOFFSET) == 0)
730 vn_set_fpf_offset(fp, uio->uio_offset);
738 vn_statfile(struct file *fp, struct stat *sb, struct ucred *cred)
743 vp = (struct vnode *)fp->f_data;
744 error = vn_stat(vp, sb, cred);
752 vn_stat(struct vnode *vp, struct stat *sb, struct ucred *cred)
761 error = VOP_GETATTR(vp, vap);
766 * 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;
886 * MPALMOSTSAFE - acquires mplock
889 vn_ioctl(struct file *fp, u_long com, caddr_t data, struct ucred *ucred,
892 struct vnode *vp = ((struct vnode *)fp->f_data);
898 switch (vp->v_type) {
901 if (com == FIONREAD) {
902 error = VOP_GETATTR(vp, &vattr);
905 size = vattr.va_size;
906 if ((vp->v_flag & VNOTSEEKABLE) == 0)
907 size -= vn_poll_fpf_offset(fp);
908 if (size > 0x7FFFFFFF)
914 if (com == FIOASYNC) { /* XXX */
926 if (com == FIODTYPE) {
927 if (vp->v_type != VCHR && vp->v_type != VBLK) {
931 *(int *)data = dev_dflags(vp->v_rdev) & D_TYPEMASK;
935 error = VOP_IOCTL(vp, com, data, fp->f_flag, ucred, msg);
936 if (error == 0 && com == TIOCSCTTY) {
937 struct proc *p = curthread->td_proc;
938 struct session *sess;
947 /* Do nothing if reassigning same control tty */
948 if (sess->s_ttyvp == vp) {
954 /* Get rid of reference to old control tty */
968 * Check that the vnode is still valid, and if so
969 * acquire requested lock.
973 vn_lock(struct vnode *vp, int flags)
975 debug_vn_lock(struct vnode *vp, int flags, const char *filename, int line)
982 vp->filename = filename;
984 error = debuglockmgr(&vp->v_lock, flags,
985 "vn_lock", filename, line);
987 error = lockmgr(&vp->v_lock, flags);
991 } while (flags & LK_RETRY);
994 * Because we (had better!) have a ref on the vnode, once it
995 * goes to VRECLAIMED state it will not be recycled until all
996 * refs go away. So we can just check the flag.
998 if (error == 0 && (vp->v_flag & VRECLAIMED)) {
999 lockmgr(&vp->v_lock, LK_RELEASE);
1005 #ifdef DEBUG_VN_UNLOCK
1008 debug_vn_unlock(struct vnode *vp, const char *filename, int line)
1010 kprintf("vn_unlock from %s:%d\n", filename, line);
1011 lockmgr(&vp->v_lock, LK_RELEASE);
1017 vn_unlock(struct vnode *vp)
1019 lockmgr(&vp->v_lock, LK_RELEASE);
1028 vn_islocked(struct vnode *vp)
1030 return (lockstatus(&vp->v_lock, curthread));
1034 * Return the lock status of a vnode and unlock the vnode
1035 * if we owned the lock. This is not a boolean, if the
1036 * caller cares what the lock status is the caller must
1037 * check the various possible values.
1039 * This only unlocks exclusive locks held by the caller,
1040 * it will NOT unlock shared locks (there is no way to
1041 * tell who the shared lock belongs to).
1046 vn_islocked_unlock(struct vnode *vp)
1050 vpls = lockstatus(&vp->v_lock, curthread);
1051 if (vpls == LK_EXCLUSIVE)
1052 lockmgr(&vp->v_lock, LK_RELEASE);
1057 * Restore a vnode lock that we previously released via
1058 * vn_islocked_unlock(). This is a NOP if we did not
1059 * own the original lock.
1064 vn_islocked_relock(struct vnode *vp, int vpls)
1068 if (vpls == LK_EXCLUSIVE)
1069 error = lockmgr(&vp->v_lock, vpls);
1076 vn_closefile(struct file *fp)
1080 fp->f_ops = &badfileops;
1081 error = vn_close(((struct vnode *)fp->f_data), fp->f_flag);
1089 vn_kqfilter(struct file *fp, struct knote *kn)
1093 error = VOP_KQFILTER(((struct vnode *)fp->f_data), kn);