2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94
39 * $FreeBSD: src/sys/kern/vfs_syscalls.c,v 1.151.2.18 2003/04/04 20:35:58 tegge Exp $
40 * $DragonFly: src/sys/kern/vfs_syscalls.c,v 1.133 2008/06/28 17:59:49 dillon Exp $
43 #include <sys/param.h>
44 #include <sys/systm.h>
47 #include <sys/sysent.h>
48 #include <sys/malloc.h>
49 #include <sys/mount.h>
50 #include <sys/mountctl.h>
51 #include <sys/sysproto.h>
52 #include <sys/filedesc.h>
53 #include <sys/kernel.h>
54 #include <sys/fcntl.h>
56 #include <sys/linker.h>
58 #include <sys/unistd.h>
59 #include <sys/vnode.h>
61 #include <sys/namei.h>
62 #include <sys/nlookup.h>
63 #include <sys/dirent.h>
64 #include <sys/extattr.h>
65 #include <sys/spinlock.h>
66 #include <sys/kern_syscall.h>
67 #include <sys/objcache.h>
68 #include <sys/sysctl.h>
71 #include <sys/file2.h>
72 #include <sys/spinlock2.h>
75 #include <vm/vm_object.h>
76 #include <vm/vm_page.h>
78 #include <machine/limits.h>
79 #include <machine/stdarg.h>
81 #include <vfs/union/union.h>
83 static void mount_warning(struct mount *mp, const char *ctl, ...);
84 static int mount_path(struct proc *p, struct mount *mp, char **rb, char **fb);
85 static int checkvp_chdir (struct vnode *vn, struct thread *td);
86 static void checkdirs (struct nchandle *old_nch, struct nchandle *new_nch);
87 static int chroot_refuse_vdir_fds (struct filedesc *fdp);
88 static int chroot_visible_mnt(struct mount *mp, struct proc *p);
89 static int getutimes (const struct timeval *, struct timespec *);
90 static int setfown (struct vnode *, uid_t, gid_t);
91 static int setfmode (struct vnode *, int);
92 static int setfflags (struct vnode *, int);
93 static int setutimes (struct vnode *, const struct timespec *, int);
94 static int usermount = 0; /* if 1, non-root can mount fs. */
96 int (*union_dircheckp) (struct thread *, struct vnode **, struct file *);
98 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, "");
101 * Virtual File System System Calls
105 * Mount a file system.
108 * mount_args(char *type, char *path, int flags, caddr_t data)
112 sys_mount(struct mount_args *uap)
114 struct thread *td = curthread;
115 struct proc *p = td->td_proc;
119 struct vfsconf *vfsp;
120 int error, flag = 0, flag2 = 0;
123 struct nlookupdata nd;
124 char fstypename[MFSNAMELEN];
125 struct ucred *cred = p->p_ucred;
128 if (cred->cr_prison != NULL)
130 if (usermount == 0 && (error = suser(td)))
133 * Do not allow NFS export by non-root users.
135 if (uap->flags & MNT_EXPORTED) {
141 * Silently enforce MNT_NOSUID and MNT_NODEV for non-root users
144 uap->flags |= MNT_NOSUID | MNT_NODEV;
147 * Lookup the requested path and extract the nch and vnode.
149 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
151 if ((error = nlookup(&nd)) == 0) {
152 if (nd.nl_nch.ncp->nc_vp == NULL)
162 * Extract the locked+refd ncp and cleanup the nd structure
165 cache_zero(&nd.nl_nch);
168 if ((nch.ncp->nc_flag & NCF_ISMOUNTPT) && cache_findmount(&nch))
175 * now we have the locked ref'd nch and unreferenced vnode.
178 if ((error = vget(vp, LK_EXCLUSIVE)) != 0) {
185 * Now we have an unlocked ref'd nch and a locked ref'd vp
187 if (uap->flags & MNT_UPDATE) {
188 if ((vp->v_flag & VROOT) == 0) {
195 flag2 = mp->mnt_kern_flag;
197 * We only allow the filesystem to be reloaded if it
198 * is currently mounted read-only.
200 if ((uap->flags & MNT_RELOAD) &&
201 ((mp->mnt_flag & MNT_RDONLY) == 0)) {
204 return (EOPNOTSUPP); /* Needs translation */
207 * Only root, or the user that did the original mount is
208 * permitted to update it.
210 if (mp->mnt_stat.f_owner != cred->cr_uid &&
211 (error = suser(td))) {
216 if (vfs_busy(mp, LK_NOWAIT)) {
221 if ((vp->v_flag & VMOUNT) != 0 || hasmount) {
227 vp->v_flag |= VMOUNT;
229 uap->flags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE);
234 * If the user is not root, ensure that they own the directory
235 * onto which we are attempting to mount.
237 if ((error = VOP_GETATTR(vp, &va)) ||
238 (va.va_uid != cred->cr_uid && (error = suser(td)))) {
243 if ((error = vinvalbuf(vp, V_SAVE, 0, 0)) != 0) {
248 if (vp->v_type != VDIR) {
253 if (vp->v_mount->mnt_kern_flag & MNTK_NOSTKMNT) {
258 if ((error = copyinstr(uap->type, fstypename, MFSNAMELEN, NULL)) != 0) {
263 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
264 if (!strcmp(vfsp->vfc_name, fstypename))
270 /* Only load modules for root (very important!) */
271 if ((error = suser(td)) != 0) {
276 error = linker_load_file(fstypename, &lf);
277 if (error || lf == NULL) {
285 /* lookup again, see if the VFS was loaded */
286 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
287 if (!strcmp(vfsp->vfc_name, fstypename))
292 linker_file_unload(lf);
298 if ((vp->v_flag & VMOUNT) != 0 || hasmount) {
303 vp->v_flag |= VMOUNT;
306 * Allocate and initialize the filesystem.
308 mp = kmalloc(sizeof(struct mount), M_MOUNT, M_ZERO|M_WAITOK);
309 TAILQ_INIT(&mp->mnt_nvnodelist);
310 TAILQ_INIT(&mp->mnt_reservedvnlist);
311 TAILQ_INIT(&mp->mnt_jlist);
312 mp->mnt_nvnodelistsize = 0;
313 lockinit(&mp->mnt_lock, "vfslock", 0, 0);
314 vfs_busy(mp, LK_NOWAIT);
315 mp->mnt_op = vfsp->vfc_vfsops;
317 vfsp->vfc_refcount++;
318 mp->mnt_stat.f_type = vfsp->vfc_typenum;
319 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
320 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
321 mp->mnt_stat.f_owner = cred->cr_uid;
322 mp->mnt_iosize_max = DFLTPHYS;
326 * Set the mount level flags.
328 if (uap->flags & MNT_RDONLY)
329 mp->mnt_flag |= MNT_RDONLY;
330 else if (mp->mnt_flag & MNT_RDONLY)
331 mp->mnt_kern_flag |= MNTK_WANTRDWR;
332 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
333 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOATIME |
334 MNT_NOSYMFOLLOW | MNT_IGNORE |
335 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR);
336 mp->mnt_flag |= uap->flags & (MNT_NOSUID | MNT_NOEXEC |
337 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_FORCE |
338 MNT_NOSYMFOLLOW | MNT_IGNORE |
339 MNT_NOATIME | MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR);
341 * Mount the filesystem.
342 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
345 error = VFS_MOUNT(mp, uap->path, uap->data, cred);
346 if (mp->mnt_flag & MNT_UPDATE) {
347 if (mp->mnt_kern_flag & MNTK_WANTRDWR)
348 mp->mnt_flag &= ~MNT_RDONLY;
349 mp->mnt_flag &=~ (MNT_UPDATE | MNT_RELOAD | MNT_FORCE);
350 mp->mnt_kern_flag &=~ MNTK_WANTRDWR;
353 mp->mnt_kern_flag = flag2;
356 vp->v_flag &= ~VMOUNT;
361 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
363 * Put the new filesystem on the mount list after root. The mount
364 * point gets its own mnt_ncmountpt (unless the VFS already set one
365 * up) which represents the root of the mount. The lookup code
366 * detects the mount point going forward and checks the root of
367 * the mount going backwards.
369 * It is not necessary to invalidate or purge the vnode underneath
370 * because elements under the mount will be given their own glue
374 if (mp->mnt_ncmountpt.ncp == NULL) {
376 * allocate, then unlock, but leave the ref intact
378 cache_allocroot(&mp->mnt_ncmountpt, mp, NULL);
379 cache_unlock(&mp->mnt_ncmountpt);
381 mp->mnt_ncmounton = nch; /* inherits ref */
382 nch.ncp->nc_flag |= NCF_ISMOUNTPT;
384 /* XXX get the root of the fs and cache_setvp(mnt_ncmountpt...) */
385 vp->v_flag &= ~VMOUNT;
386 mountlist_insert(mp, MNTINS_LAST);
387 checkdirs(&mp->mnt_ncmounton, &mp->mnt_ncmountpt);
389 error = vfs_allocate_syncvnode(mp);
391 error = VFS_START(mp, 0);
394 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_coherency_ops);
395 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_journal_ops);
396 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_norm_ops);
397 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_spec_ops);
398 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_fifo_ops);
399 vp->v_flag &= ~VMOUNT;
400 mp->mnt_vfc->vfc_refcount--;
410 * Scan all active processes to see if any of them have a current
411 * or root directory onto which the new filesystem has just been
412 * mounted. If so, replace them with the new mount point.
414 * The passed ncp is ref'd and locked (from the mount code) and
415 * must be associated with the vnode representing the root of the
418 struct checkdirs_info {
419 struct nchandle old_nch;
420 struct nchandle new_nch;
421 struct vnode *old_vp;
422 struct vnode *new_vp;
425 static int checkdirs_callback(struct proc *p, void *data);
428 checkdirs(struct nchandle *old_nch, struct nchandle *new_nch)
430 struct checkdirs_info info;
436 * If the old mount point's vnode has a usecount of 1, it is not
437 * being held as a descriptor anywhere.
439 olddp = old_nch->ncp->nc_vp;
440 if (olddp == NULL || olddp->v_sysref.refcnt == 1)
444 * Force the root vnode of the new mount point to be resolved
445 * so we can update any matching processes.
448 if (VFS_ROOT(mp, &newdp))
449 panic("mount: lost mount");
450 cache_setunresolved(new_nch);
451 cache_setvp(new_nch, newdp);
454 * Special handling of the root node
456 if (rootvnode == olddp) {
458 vfs_cache_setroot(newdp, cache_hold(new_nch));
462 * Pass newdp separately so the callback does not have to access
463 * it via new_nch->ncp->nc_vp.
465 info.old_nch = *old_nch;
466 info.new_nch = *new_nch;
468 allproc_scan(checkdirs_callback, &info);
473 * NOTE: callback is not MP safe because the scanned process's filedesc
474 * structure can be ripped out from under us, amoung other things.
477 checkdirs_callback(struct proc *p, void *data)
479 struct checkdirs_info *info = data;
480 struct filedesc *fdp;
481 struct nchandle ncdrop1;
482 struct nchandle ncdrop2;
483 struct vnode *vprele1;
484 struct vnode *vprele2;
486 if ((fdp = p->p_fd) != NULL) {
487 cache_zero(&ncdrop1);
488 cache_zero(&ncdrop2);
493 * MPUNSAFE - XXX fdp can be pulled out from under a
496 * A shared filedesc is ok, we don't have to copy it
497 * because we are making this change globally.
499 spin_lock_wr(&fdp->fd_spin);
500 if (fdp->fd_ncdir.mount == info->old_nch.mount &&
501 fdp->fd_ncdir.ncp == info->old_nch.ncp) {
502 vprele1 = fdp->fd_cdir;
504 fdp->fd_cdir = info->new_vp;
505 ncdrop1 = fdp->fd_ncdir;
506 cache_copy(&info->new_nch, &fdp->fd_ncdir);
508 if (fdp->fd_nrdir.mount == info->old_nch.mount &&
509 fdp->fd_nrdir.ncp == info->old_nch.ncp) {
510 vprele2 = fdp->fd_rdir;
512 fdp->fd_rdir = info->new_vp;
513 ncdrop2 = fdp->fd_nrdir;
514 cache_copy(&info->new_nch, &fdp->fd_nrdir);
516 spin_unlock_wr(&fdp->fd_spin);
518 cache_drop(&ncdrop1);
520 cache_drop(&ncdrop2);
530 * Unmount a file system.
532 * Note: unmount takes a path to the vnode mounted on as argument,
533 * not special file (as before).
536 * umount_args(char *path, int flags)
540 sys_unmount(struct unmount_args *uap)
542 struct thread *td = curthread;
543 struct proc *p = td->td_proc;
544 struct mount *mp = NULL;
546 struct nlookupdata nd;
549 if (p->p_ucred->cr_prison != NULL)
551 if (usermount == 0 && (error = suser(td)))
554 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
556 error = nlookup(&nd);
560 mp = nd.nl_nch.mount;
563 * Only root, or the user that did the original mount is
564 * permitted to unmount this filesystem.
566 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) &&
571 * Don't allow unmounting the root file system.
573 if (mp->mnt_flag & MNT_ROOTFS) {
579 * Must be the root of the filesystem
581 if (nd.nl_nch.ncp != mp->mnt_ncmountpt.ncp) {
590 return (dounmount(mp, uap->flags));
594 * Do the actual file system unmount.
597 dounmount_interlock(struct mount *mp)
599 if (mp->mnt_kern_flag & MNTK_UNMOUNT)
601 mp->mnt_kern_flag |= MNTK_UNMOUNT;
606 dounmount(struct mount *mp, int flags)
608 struct namecache *ncp;
617 * Exclusive access for unmounting purposes
619 if ((error = mountlist_interlock(dounmount_interlock, mp)) != 0)
623 * Allow filesystems to detect that a forced unmount is in progress.
625 if (flags & MNT_FORCE)
626 mp->mnt_kern_flag |= MNTK_UNMOUNTF;
627 lflags = LK_EXCLUSIVE | ((flags & MNT_FORCE) ? 0 : LK_NOWAIT);
628 error = lockmgr(&mp->mnt_lock, lflags);
630 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
631 if (mp->mnt_kern_flag & MNTK_MWAIT)
636 if (mp->mnt_flag & MNT_EXPUBLIC)
637 vfs_setpublicfs(NULL, NULL, NULL);
639 vfs_msync(mp, MNT_WAIT);
640 async_flag = mp->mnt_flag & MNT_ASYNC;
641 mp->mnt_flag &=~ MNT_ASYNC;
644 * If this filesystem isn't aliasing other filesystems,
645 * try to invalidate any remaining namecache entries and
646 * check the count afterwords.
648 if ((mp->mnt_kern_flag & MNTK_NCALIASED) == 0) {
649 cache_lock(&mp->mnt_ncmountpt);
650 cache_inval(&mp->mnt_ncmountpt, CINV_DESTROY|CINV_CHILDREN);
651 cache_unlock(&mp->mnt_ncmountpt);
653 if ((ncp = mp->mnt_ncmountpt.ncp) != NULL &&
654 (ncp->nc_refs != 1 || TAILQ_FIRST(&ncp->nc_list))) {
656 if ((flags & MNT_FORCE) == 0) {
658 mount_warning(mp, "Cannot unmount: "
664 mount_warning(mp, "Forced unmount: "
675 * nchandle records ref the mount structure. Expect a count of 1
676 * (our mount->mnt_ncmountpt).
678 if (mp->mnt_refs != 1) {
679 if ((flags & MNT_FORCE) == 0) {
680 mount_warning(mp, "Cannot unmount: "
681 "%d process references still "
682 "present", mp->mnt_refs);
685 mount_warning(mp, "Forced unmount: "
686 "%d process references still "
687 "present", mp->mnt_refs);
693 * Decomission our special mnt_syncer vnode. This also stops
694 * the vnlru code. If we are unable to unmount we recommission
698 if ((vp = mp->mnt_syncer) != NULL) {
699 mp->mnt_syncer = NULL;
702 if (((mp->mnt_flag & MNT_RDONLY) ||
703 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) ||
704 (flags & MNT_FORCE)) {
705 error = VFS_UNMOUNT(mp, flags);
709 if (mp->mnt_syncer == NULL)
710 vfs_allocate_syncvnode(mp);
711 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
712 mp->mnt_flag |= async_flag;
713 lockmgr(&mp->mnt_lock, LK_RELEASE);
714 if (mp->mnt_kern_flag & MNTK_MWAIT)
719 * Clean up any journals still associated with the mount after
720 * filesystem activity has ceased.
722 journal_remove_all_journals(mp,
723 ((flags & MNT_FORCE) ? MC_JOURNAL_STOP_IMM : 0));
725 mountlist_remove(mp);
728 * Remove any installed vnode ops here so the individual VFSs don't
731 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_coherency_ops);
732 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_journal_ops);
733 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_norm_ops);
734 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_spec_ops);
735 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_fifo_ops);
737 if (mp->mnt_ncmountpt.ncp != NULL) {
738 nch = mp->mnt_ncmountpt;
739 cache_zero(&mp->mnt_ncmountpt);
740 cache_clrmountpt(&nch);
743 if (mp->mnt_ncmounton.ncp != NULL) {
744 nch = mp->mnt_ncmounton;
745 cache_zero(&mp->mnt_ncmounton);
746 cache_clrmountpt(&nch);
750 mp->mnt_vfc->vfc_refcount--;
751 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist))
752 panic("unmount: dangling vnode");
753 lockmgr(&mp->mnt_lock, LK_RELEASE);
754 if (mp->mnt_kern_flag & MNTK_MWAIT)
763 mount_warning(struct mount *mp, const char *ctl, ...)
770 if (cache_fullpath(NULL, &mp->mnt_ncmounton, &ptr, &buf) == 0) {
771 kprintf("unmount(%s): ", ptr);
776 kprintf("unmount(%p", mp);
777 if (mp->mnt_ncmounton.ncp && mp->mnt_ncmounton.ncp->nc_name)
778 kprintf(",%s", mp->mnt_ncmounton.ncp->nc_name);
787 * Shim cache_fullpath() to handle the case where a process is chrooted into
788 * a subdirectory of a mount. In this case if the root mount matches the
789 * process root directory's mount we have to specify the process's root
790 * directory instead of the mount point, because the mount point might
791 * be above the root directory.
795 mount_path(struct proc *p, struct mount *mp, char **rb, char **fb)
797 struct nchandle *nch;
799 if (p && p->p_fd->fd_nrdir.mount == mp)
800 nch = &p->p_fd->fd_nrdir;
802 nch = &mp->mnt_ncmountpt;
803 return(cache_fullpath(p, nch, rb, fb));
807 * Sync each mounted filesystem.
811 static int syncprt = 0;
812 SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, "");
815 static int sync_callback(struct mount *mp, void *data);
819 sys_sync(struct sync_args *uap)
821 mountlist_scan(sync_callback, NULL, MNTSCAN_FORWARD);
824 * print out buffer pool stat information on each sync() call.
834 sync_callback(struct mount *mp, void *data __unused)
838 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
839 asyncflag = mp->mnt_flag & MNT_ASYNC;
840 mp->mnt_flag &= ~MNT_ASYNC;
841 vfs_msync(mp, MNT_NOWAIT);
842 VFS_SYNC(mp, MNT_NOWAIT);
843 mp->mnt_flag |= asyncflag;
848 /* XXX PRISON: could be per prison flag */
849 static int prison_quotas;
851 SYSCTL_INT(_kern_prison, OID_AUTO, quotas, CTLFLAG_RW, &prison_quotas, 0, "");
855 * quotactl_args(char *path, int fcmd, int uid, caddr_t arg)
857 * Change filesystem quotas.
861 sys_quotactl(struct quotactl_args *uap)
863 struct nlookupdata nd;
871 if (p->p_ucred->cr_prison && !prison_quotas)
874 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
876 error = nlookup(&nd);
878 mp = nd.nl_nch.mount;
879 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid,
880 uap->arg, nd.nl_cred);
887 * mountctl(char *path, int op, int fd, const void *ctl, int ctllen,
888 * void *buf, int buflen)
890 * This function operates on a mount point and executes the specified
891 * operation using the specified control data, and possibly returns data.
893 * The actual number of bytes stored in the result buffer is returned, 0
894 * if none, otherwise an error is returned.
898 sys_mountctl(struct mountctl_args *uap)
900 struct thread *td = curthread;
901 struct proc *p = td->td_proc;
909 * Sanity and permissions checks. We must be root.
912 if (p->p_ucred->cr_prison != NULL)
914 if ((error = suser(td)) != 0)
918 * Argument length checks
920 if (uap->ctllen < 0 || uap->ctllen > 1024)
922 if (uap->buflen < 0 || uap->buflen > 16 * 1024)
924 if (uap->path == NULL)
928 * Allocate the necessary buffers and copyin data
930 path = objcache_get(namei_oc, M_WAITOK);
931 error = copyinstr(uap->path, path, MAXPATHLEN, NULL);
936 ctl = kmalloc(uap->ctllen + 1, M_TEMP, M_WAITOK|M_ZERO);
937 error = copyin(uap->ctl, ctl, uap->ctllen);
942 buf = kmalloc(uap->buflen + 1, M_TEMP, M_WAITOK|M_ZERO);
945 * Validate the descriptor
948 fp = holdfp(p->p_fd, uap->fd, -1);
958 * Execute the internal kernel function and clean up.
960 error = kern_mountctl(path, uap->op, fp, ctl, uap->ctllen, buf, uap->buflen, &uap->sysmsg_result);
963 if (error == 0 && uap->sysmsg_result > 0)
964 error = copyout(buf, uap->buf, uap->sysmsg_result);
967 objcache_put(namei_oc, path);
976 * Execute a mount control operation by resolving the path to a mount point
977 * and calling vop_mountctl().
980 kern_mountctl(const char *path, int op, struct file *fp,
981 const void *ctl, int ctllen,
982 void *buf, int buflen, int *res)
986 struct nlookupdata nd;
991 error = nlookup_init(&nd, path, UIO_SYSSPACE, NLC_FOLLOW);
993 error = nlookup(&nd);
995 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);
1003 * Must be the root of the filesystem
1005 if ((vp->v_flag & VROOT) == 0) {
1009 error = vop_mountctl(mp->mnt_vn_use_ops, op, fp, ctl, ctllen,
1016 kern_statfs(struct nlookupdata *nd, struct statfs *buf)
1018 struct thread *td = curthread;
1019 struct proc *p = td->td_proc;
1022 char *fullpath, *freepath;
1025 if ((error = nlookup(nd)) != 0)
1027 mp = nd->nl_nch.mount;
1029 if ((error = VFS_STATFS(mp, sp, nd->nl_cred)) != 0)
1032 error = mount_path(p, mp, &fullpath, &freepath);
1035 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
1036 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname));
1037 kfree(freepath, M_TEMP);
1039 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
1040 bcopy(sp, buf, sizeof(*buf));
1041 /* Only root should have access to the fsid's. */
1043 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0;
1048 * statfs_args(char *path, struct statfs *buf)
1050 * Get filesystem statistics.
1053 sys_statfs(struct statfs_args *uap)
1055 struct nlookupdata nd;
1059 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
1061 error = kern_statfs(&nd, &buf);
1064 error = copyout(&buf, uap->buf, sizeof(*uap->buf));
1069 kern_fstatfs(int fd, struct statfs *buf)
1071 struct thread *td = curthread;
1072 struct proc *p = td->td_proc;
1076 char *fullpath, *freepath;
1080 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0)
1082 mp = ((struct vnode *)fp->f_data)->v_mount;
1087 if (fp->f_cred == NULL) {
1092 if ((error = VFS_STATFS(mp, sp, fp->f_cred)) != 0)
1095 if ((error = mount_path(p, mp, &fullpath, &freepath)) != 0)
1097 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
1098 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname));
1099 kfree(freepath, M_TEMP);
1101 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
1102 bcopy(sp, buf, sizeof(*buf));
1104 /* Only root should have access to the fsid's. */
1106 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0;
1114 * fstatfs_args(int fd, struct statfs *buf)
1116 * Get filesystem statistics.
1119 sys_fstatfs(struct fstatfs_args *uap)
1124 error = kern_fstatfs(uap->fd, &buf);
1127 error = copyout(&buf, uap->buf, sizeof(*uap->buf));
1132 kern_statvfs(struct nlookupdata *nd, struct statvfs *buf)
1138 if ((error = nlookup(nd)) != 0)
1140 mp = nd->nl_nch.mount;
1141 sp = &mp->mnt_vstat;
1142 if ((error = VFS_STATVFS(mp, sp, nd->nl_cred)) != 0)
1146 if (mp->mnt_flag & MNT_RDONLY)
1147 sp->f_flag |= ST_RDONLY;
1148 if (mp->mnt_flag & MNT_NOSUID)
1149 sp->f_flag |= ST_NOSUID;
1150 bcopy(sp, buf, sizeof(*buf));
1155 * statfs_args(char *path, struct statfs *buf)
1157 * Get filesystem statistics.
1160 sys_statvfs(struct statvfs_args *uap)
1162 struct nlookupdata nd;
1166 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
1168 error = kern_statvfs(&nd, &buf);
1171 error = copyout(&buf, uap->buf, sizeof(*uap->buf));
1176 kern_fstatvfs(int fd, struct statvfs *buf)
1178 struct thread *td = curthread;
1179 struct proc *p = td->td_proc;
1186 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0)
1188 mp = ((struct vnode *)fp->f_data)->v_mount;
1193 if (fp->f_cred == NULL) {
1197 sp = &mp->mnt_vstat;
1198 if ((error = VFS_STATVFS(mp, sp, fp->f_cred)) != 0)
1202 if (mp->mnt_flag & MNT_RDONLY)
1203 sp->f_flag |= ST_RDONLY;
1204 if (mp->mnt_flag & MNT_NOSUID)
1205 sp->f_flag |= ST_NOSUID;
1207 bcopy(sp, buf, sizeof(*buf));
1215 * fstatfs_args(int fd, struct statfs *buf)
1217 * Get filesystem statistics.
1220 sys_fstatvfs(struct fstatvfs_args *uap)
1225 error = kern_fstatvfs(uap->fd, &buf);
1228 error = copyout(&buf, uap->buf, sizeof(*uap->buf));
1233 * getfsstat_args(struct statfs *buf, long bufsize, int flags)
1235 * Get statistics on all filesystems.
1238 struct getfsstat_info {
1239 struct statfs *sfsp;
1247 static int getfsstat_callback(struct mount *, void *);
1251 sys_getfsstat(struct getfsstat_args *uap)
1253 struct thread *td = curthread;
1254 struct proc *p = td->td_proc;
1255 struct getfsstat_info info;
1257 bzero(&info, sizeof(info));
1259 info.maxcount = uap->bufsize / sizeof(struct statfs);
1260 info.sfsp = uap->buf;
1262 info.flags = uap->flags;
1265 mountlist_scan(getfsstat_callback, &info, MNTSCAN_FORWARD);
1266 if (info.sfsp && info.count > info.maxcount)
1267 uap->sysmsg_result = info.maxcount;
1269 uap->sysmsg_result = info.count;
1270 return (info.error);
1274 getfsstat_callback(struct mount *mp, void *data)
1276 struct getfsstat_info *info = data;
1282 if (info->sfsp && info->count < info->maxcount) {
1283 if (info->p && !chroot_visible_mnt(mp, info->p))
1288 * If MNT_NOWAIT or MNT_LAZY is specified, do not
1289 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
1290 * overrides MNT_WAIT.
1292 if (((info->flags & (MNT_LAZY|MNT_NOWAIT)) == 0 ||
1293 (info->flags & MNT_WAIT)) &&
1294 (error = VFS_STATFS(mp, sp, info->p->p_ucred))) {
1297 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
1299 error = mount_path(info->p, mp, &fullpath, &freepath);
1301 info->error = error;
1304 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
1305 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname));
1306 kfree(freepath, M_TEMP);
1308 error = copyout(sp, info->sfsp, sizeof(*sp));
1310 info->error = error;
1320 * getvfsstat_args(struct statfs *buf, struct statvfs *vbuf,
1321 long bufsize, int flags)
1323 * Get statistics on all filesystems.
1326 struct getvfsstat_info {
1327 struct statfs *sfsp;
1328 struct statvfs *vsfsp;
1336 static int getvfsstat_callback(struct mount *, void *);
1340 sys_getvfsstat(struct getvfsstat_args *uap)
1342 struct thread *td = curthread;
1343 struct proc *p = td->td_proc;
1344 struct getvfsstat_info info;
1346 bzero(&info, sizeof(info));
1348 info.maxcount = uap->vbufsize / sizeof(struct statvfs);
1349 info.sfsp = uap->buf;
1350 info.vsfsp = uap->vbuf;
1352 info.flags = uap->flags;
1355 mountlist_scan(getvfsstat_callback, &info, MNTSCAN_FORWARD);
1356 if (info.vsfsp && info.count > info.maxcount)
1357 uap->sysmsg_result = info.maxcount;
1359 uap->sysmsg_result = info.count;
1360 return (info.error);
1364 getvfsstat_callback(struct mount *mp, void *data)
1366 struct getvfsstat_info *info = data;
1368 struct statvfs *vsp;
1373 if (info->vsfsp && info->count < info->maxcount) {
1374 if (info->p && !chroot_visible_mnt(mp, info->p))
1377 vsp = &mp->mnt_vstat;
1380 * If MNT_NOWAIT or MNT_LAZY is specified, do not
1381 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
1382 * overrides MNT_WAIT.
1384 if (((info->flags & (MNT_LAZY|MNT_NOWAIT)) == 0 ||
1385 (info->flags & MNT_WAIT)) &&
1386 (error = VFS_STATFS(mp, sp, info->p->p_ucred))) {
1389 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
1391 if (((info->flags & (MNT_LAZY|MNT_NOWAIT)) == 0 ||
1392 (info->flags & MNT_WAIT)) &&
1393 (error = VFS_STATVFS(mp, vsp, info->p->p_ucred))) {
1397 if (mp->mnt_flag & MNT_RDONLY)
1398 vsp->f_flag |= ST_RDONLY;
1399 if (mp->mnt_flag & MNT_NOSUID)
1400 vsp->f_flag |= ST_NOSUID;
1402 error = mount_path(info->p, mp, &fullpath, &freepath);
1404 info->error = error;
1407 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
1408 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname));
1409 kfree(freepath, M_TEMP);
1411 error = copyout(sp, info->sfsp, sizeof(*sp));
1413 error = copyout(vsp, info->vsfsp, sizeof(*vsp));
1415 info->error = error;
1427 * fchdir_args(int fd)
1429 * Change current working directory to a given file descriptor.
1433 sys_fchdir(struct fchdir_args *uap)
1435 struct thread *td = curthread;
1436 struct proc *p = td->td_proc;
1437 struct filedesc *fdp = p->p_fd;
1438 struct vnode *vp, *ovp;
1441 struct nchandle nch, onch, tnch;
1444 if ((error = holdvnode(fdp, uap->fd, &fp)) != 0)
1446 vp = (struct vnode *)fp->f_data;
1448 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1449 if (vp->v_type != VDIR || fp->f_nchandle.ncp == NULL)
1452 error = VOP_ACCESS(vp, VEXEC, p->p_ucred);
1458 cache_copy(&fp->f_nchandle, &nch);
1461 * If the ncp has become a mount point, traverse through
1465 while (!error && (nch.ncp->nc_flag & NCF_ISMOUNTPT) &&
1466 (mp = cache_findmount(&nch)) != NULL
1468 error = nlookup_mp(mp, &tnch);
1470 cache_unlock(&tnch); /* leave ref intact */
1472 vp = tnch.ncp->nc_vp;
1473 error = vget(vp, LK_SHARED);
1474 KKASSERT(error == 0);
1481 onch = fdp->fd_ncdir;
1482 vn_unlock(vp); /* leave ref intact */
1484 fdp->fd_ncdir = nch;
1496 kern_chdir(struct nlookupdata *nd)
1498 struct thread *td = curthread;
1499 struct proc *p = td->td_proc;
1500 struct filedesc *fdp = p->p_fd;
1501 struct vnode *vp, *ovp;
1502 struct nchandle onch;
1505 if ((error = nlookup(nd)) != 0)
1507 if ((vp = nd->nl_nch.ncp->nc_vp) == NULL)
1509 if ((error = vget(vp, LK_SHARED)) != 0)
1512 error = checkvp_chdir(vp, td);
1516 onch = fdp->fd_ncdir;
1517 cache_unlock(&nd->nl_nch); /* leave reference intact */
1518 fdp->fd_ncdir = nd->nl_nch;
1522 cache_zero(&nd->nl_nch);
1530 * chdir_args(char *path)
1532 * Change current working directory (``.'').
1535 sys_chdir(struct chdir_args *uap)
1537 struct nlookupdata nd;
1540 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
1542 error = kern_chdir(&nd);
1548 * Helper function for raised chroot(2) security function: Refuse if
1549 * any filedescriptors are open directories.
1552 chroot_refuse_vdir_fds(struct filedesc *fdp)
1559 for (fd = 0; fd < fdp->fd_nfiles ; fd++) {
1560 if ((error = holdvnode(fdp, fd, &fp)) != 0)
1562 vp = (struct vnode *)fp->f_data;
1563 if (vp->v_type != VDIR) {
1574 * This sysctl determines if we will allow a process to chroot(2) if it
1575 * has a directory open:
1576 * 0: disallowed for all processes.
1577 * 1: allowed for processes that were not already chroot(2)'ed.
1578 * 2: allowed for all processes.
1581 static int chroot_allow_open_directories = 1;
1583 SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW,
1584 &chroot_allow_open_directories, 0, "");
1587 * chroot to the specified namecache entry. We obtain the vp from the
1588 * namecache data. The passed ncp must be locked and referenced and will
1589 * remain locked and referenced on return.
1592 kern_chroot(struct nchandle *nch)
1594 struct thread *td = curthread;
1595 struct proc *p = td->td_proc;
1596 struct filedesc *fdp = p->p_fd;
1601 * Only root can chroot
1603 if ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0)
1607 * Disallow open directory descriptors (fchdir() breakouts).
1609 if (chroot_allow_open_directories == 0 ||
1610 (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) {
1611 if ((error = chroot_refuse_vdir_fds(fdp)) != 0)
1614 if ((vp = nch->ncp->nc_vp) == NULL)
1617 if ((error = vget(vp, LK_SHARED)) != 0)
1621 * Check the validity of vp as a directory to change to and
1622 * associate it with rdir/jdir.
1624 error = checkvp_chdir(vp, td);
1625 vn_unlock(vp); /* leave reference intact */
1627 vrele(fdp->fd_rdir);
1628 fdp->fd_rdir = vp; /* reference inherited by fd_rdir */
1629 cache_drop(&fdp->fd_nrdir);
1630 cache_copy(nch, &fdp->fd_nrdir);
1631 if (fdp->fd_jdir == NULL) {
1634 cache_copy(nch, &fdp->fd_njdir);
1643 * chroot_args(char *path)
1645 * Change notion of root (``/'') directory.
1649 sys_chroot(struct chroot_args *uap)
1651 struct thread *td = curthread;
1652 struct nlookupdata nd;
1655 KKASSERT(td->td_proc);
1656 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
1661 error = nlookup(&nd);
1663 error = kern_chroot(&nd.nl_nch);
1669 * Common routine for chroot and chdir. Given a locked, referenced vnode,
1670 * determine whether it is legal to chdir to the vnode. The vnode's state
1671 * is not changed by this call.
1674 checkvp_chdir(struct vnode *vp, struct thread *td)
1678 if (vp->v_type != VDIR)
1681 error = VOP_ACCESS(vp, VEXEC, td->td_proc->p_ucred);
1686 kern_open(struct nlookupdata *nd, int oflags, int mode, int *res)
1688 struct thread *td = curthread;
1689 struct proc *p = td->td_proc;
1690 struct lwp *lp = td->td_lwp;
1691 struct filedesc *fdp = p->p_fd;
1696 int type, indx, error;
1699 if ((oflags & O_ACCMODE) == O_ACCMODE)
1701 flags = FFLAGS(oflags);
1702 error = falloc(p, &nfp, NULL);
1706 cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
1709 * XXX p_dupfd is a real mess. It allows a device to return a
1710 * file descriptor to be duplicated rather then doing the open
1716 * Call vn_open() to do the lookup and assign the vnode to the
1717 * file pointer. vn_open() does not change the ref count on fp
1718 * and the vnode, on success, will be inherited by the file pointer
1721 nd->nl_flags |= NLC_LOCKVP;
1722 error = vn_open(nd, fp, flags, cmode);
1726 * handle special fdopen() case. bleh. dupfdopen() is
1727 * responsible for dropping the old contents of ofiles[indx]
1730 * Note that fsetfd() will add a ref to fp which represents
1731 * the fd_files[] assignment. We must still drop our
1734 if ((error == ENODEV || error == ENXIO) && lp->lwp_dupfd >= 0) {
1735 if (fdalloc(p, 0, &indx) == 0) {
1736 error = dupfdopen(p, indx, lp->lwp_dupfd, flags, error);
1739 fdrop(fp); /* our ref */
1742 fsetfd(p, NULL, indx);
1745 fdrop(fp); /* our ref */
1746 if (error == ERESTART)
1752 * ref the vnode for ourselves so it can't be ripped out from under
1753 * is. XXX need an ND flag to request that the vnode be returned
1756 * Reserve a file descriptor but do not assign it until the open
1759 vp = (struct vnode *)fp->f_data;
1761 if ((error = fdalloc(p, 0, &indx)) != 0) {
1768 * If no error occurs the vp will have been assigned to the file
1773 if (flags & (O_EXLOCK | O_SHLOCK)) {
1774 lf.l_whence = SEEK_SET;
1777 if (flags & O_EXLOCK)
1778 lf.l_type = F_WRLCK;
1780 lf.l_type = F_RDLCK;
1781 if (flags & FNONBLOCK)
1786 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) {
1788 * lock request failed. Clean up the reserved
1792 fsetfd(p, NULL, indx);
1796 fp->f_flag |= FHASLOCK;
1800 * Assert that all regular file vnodes were created with a object.
1802 KASSERT(vp->v_type != VREG || vp->v_object != NULL,
1803 ("open: regular file has no backing object after vn_open"));
1809 * release our private reference, leaving the one associated with the
1810 * descriptor table intact.
1812 fsetfd(p, fp, indx);
1819 * open_args(char *path, int flags, int mode)
1821 * Check permissions, allocate an open file structure,
1822 * and call the device open routine if any.
1825 sys_open(struct open_args *uap)
1827 struct nlookupdata nd;
1830 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
1832 error = kern_open(&nd, uap->flags,
1833 uap->mode, &uap->sysmsg_result);
1840 kern_mknod(struct nlookupdata *nd, int mode, int rmajor, int rminor)
1842 struct thread *td = curthread;
1843 struct proc *p = td->td_proc;
1851 switch (mode & S_IFMT) {
1857 error = suser_cred(p->p_ucred, PRISON_ROOT);
1864 nd->nl_flags |= NLC_CREATE | NLC_REFDVP;
1865 if ((error = nlookup(nd)) != 0)
1867 if (nd->nl_nch.ncp->nc_vp)
1869 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
1873 vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask;
1874 vattr.va_rmajor = rmajor;
1875 vattr.va_rminor = rminor;
1878 switch (mode & S_IFMT) {
1879 case S_IFMT: /* used by badsect to flag bad sectors */
1880 vattr.va_type = VBAD;
1883 vattr.va_type = VCHR;
1886 vattr.va_type = VBLK;
1892 /* special directories support for HAMMER */
1893 vattr.va_type = VDIR;
1901 error = VOP_NWHITEOUT(&nd->nl_nch, nd->nl_dvp,
1902 nd->nl_cred, NAMEI_CREATE);
1905 error = VOP_NMKNOD(&nd->nl_nch, nd->nl_dvp,
1906 &vp, nd->nl_cred, &vattr);
1915 * mknod_args(char *path, int mode, int dev)
1917 * Create a special file.
1920 sys_mknod(struct mknod_args *uap)
1922 struct nlookupdata nd;
1925 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
1927 error = kern_mknod(&nd, uap->mode,
1928 umajor(uap->dev), uminor(uap->dev));
1935 kern_mkfifo(struct nlookupdata *nd, int mode)
1937 struct thread *td = curthread;
1938 struct proc *p = td->td_proc;
1945 nd->nl_flags |= NLC_CREATE | NLC_REFDVP;
1946 if ((error = nlookup(nd)) != 0)
1948 if (nd->nl_nch.ncp->nc_vp)
1950 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
1954 vattr.va_type = VFIFO;
1955 vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask;
1957 error = VOP_NMKNOD(&nd->nl_nch, nd->nl_dvp, &vp, nd->nl_cred, &vattr);
1964 * mkfifo_args(char *path, int mode)
1966 * Create a named pipe.
1969 sys_mkfifo(struct mkfifo_args *uap)
1971 struct nlookupdata nd;
1974 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
1976 error = kern_mkfifo(&nd, uap->mode);
1981 static int hardlink_check_uid = 0;
1982 SYSCTL_INT(_security, OID_AUTO, hardlink_check_uid, CTLFLAG_RW,
1983 &hardlink_check_uid, 0,
1984 "Unprivileged processes cannot create hard links to files owned by other "
1986 static int hardlink_check_gid = 0;
1987 SYSCTL_INT(_security, OID_AUTO, hardlink_check_gid, CTLFLAG_RW,
1988 &hardlink_check_gid, 0,
1989 "Unprivileged processes cannot create hard links to files owned by other "
1993 can_hardlink(struct vnode *vp, struct thread *td, struct ucred *cred)
1999 * Shortcut if disabled
2001 if (hardlink_check_uid == 0 && hardlink_check_gid == 0)
2005 * root cred can always hardlink
2007 if (suser_cred(cred, PRISON_ROOT) == 0)
2011 * Otherwise only if the originating file is owned by the
2012 * same user or group. Note that any group is allowed if
2013 * the file is owned by the caller.
2015 error = VOP_GETATTR(vp, &va);
2019 if (hardlink_check_uid) {
2020 if (cred->cr_uid != va.va_uid)
2024 if (hardlink_check_gid) {
2025 if (cred->cr_uid != va.va_uid && !groupmember(va.va_gid, cred))
2033 kern_link(struct nlookupdata *nd, struct nlookupdata *linknd)
2035 struct thread *td = curthread;
2040 * Lookup the source and obtained a locked vnode.
2042 * XXX relookup on vget failure / race ?
2045 if ((error = nlookup(nd)) != 0)
2047 vp = nd->nl_nch.ncp->nc_vp;
2048 KKASSERT(vp != NULL);
2049 if (vp->v_type == VDIR)
2050 return (EPERM); /* POSIX */
2051 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
2053 if ((error = vget(vp, LK_EXCLUSIVE)) != 0)
2057 * Unlock the source so we can lookup the target without deadlocking
2058 * (XXX vp is locked already, possible other deadlock?). The target
2061 KKASSERT(nd->nl_flags & NLC_NCPISLOCKED);
2062 nd->nl_flags &= ~NLC_NCPISLOCKED;
2063 cache_unlock(&nd->nl_nch);
2065 linknd->nl_flags |= NLC_CREATE | NLC_REFDVP;
2066 if ((error = nlookup(linknd)) != 0) {
2070 if (linknd->nl_nch.ncp->nc_vp) {
2076 * Finally run the new API VOP.
2078 error = can_hardlink(vp, td, td->td_proc->p_ucred);
2080 error = VOP_NLINK(&linknd->nl_nch, linknd->nl_dvp,
2081 vp, linknd->nl_cred);
2088 * link_args(char *path, char *link)
2090 * Make a hard file link.
2093 sys_link(struct link_args *uap)
2095 struct nlookupdata nd, linknd;
2098 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2100 error = nlookup_init(&linknd, uap->link, UIO_USERSPACE, 0);
2102 error = kern_link(&nd, &linknd);
2103 nlookup_done(&linknd);
2110 kern_symlink(struct nlookupdata *nd, char *path, int mode)
2118 nd->nl_flags |= NLC_CREATE | NLC_REFDVP;
2119 if ((error = nlookup(nd)) != 0)
2121 if (nd->nl_nch.ncp->nc_vp)
2123 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
2127 vattr.va_mode = mode;
2128 error = VOP_NSYMLINK(&nd->nl_nch, dvp, &vp, nd->nl_cred, &vattr, path);
2135 * symlink(char *path, char *link)
2137 * Make a symbolic link.
2140 sys_symlink(struct symlink_args *uap)
2142 struct thread *td = curthread;
2143 struct nlookupdata nd;
2148 path = objcache_get(namei_oc, M_WAITOK);
2149 error = copyinstr(uap->path, path, MAXPATHLEN, NULL);
2151 error = nlookup_init(&nd, uap->link, UIO_USERSPACE, 0);
2153 mode = ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask;
2154 error = kern_symlink(&nd, path, mode);
2158 objcache_put(namei_oc, path);
2163 * undelete_args(char *path)
2165 * Delete a whiteout from the filesystem.
2169 sys_undelete(struct undelete_args *uap)
2171 struct nlookupdata nd;
2174 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2176 nd.nl_flags |= NLC_DELETE | NLC_REFDVP;
2178 error = nlookup(&nd);
2180 error = ncp_writechk(&nd.nl_nch);
2182 error = VOP_NWHITEOUT(&nd.nl_nch, nd.nl_dvp, nd.nl_cred,
2190 kern_unlink(struct nlookupdata *nd)
2195 nd->nl_flags |= NLC_DELETE | NLC_REFDVP;
2196 if ((error = nlookup(nd)) != 0)
2198 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
2200 error = VOP_NREMOVE(&nd->nl_nch, nd->nl_dvp, nd->nl_cred);
2205 * unlink_args(char *path)
2207 * Delete a name from the filesystem.
2210 sys_unlink(struct unlink_args *uap)
2212 struct nlookupdata nd;
2215 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2217 error = kern_unlink(&nd);
2223 kern_lseek(int fd, off_t offset, int whence, off_t *res)
2225 struct thread *td = curthread;
2226 struct proc *p = td->td_proc;
2233 fp = holdfp(p->p_fd, fd, -1);
2236 if (fp->f_type != DTYPE_VNODE) {
2240 vp = (struct vnode *)fp->f_data;
2244 new_offset = fp->f_offset + offset;
2248 error = VOP_GETATTR(vp, &vattr);
2249 new_offset = offset + vattr.va_size;
2252 new_offset = offset;
2262 * Validate the seek position. Negative offsets are not allowed
2263 * for regular files, block specials, or directories.
2266 if (new_offset < 0 &&
2267 (vp->v_type == VREG || vp->v_type == VDIR ||
2268 vp->v_type == VCHR || vp->v_type == VBLK)) {
2271 fp->f_offset = new_offset;
2274 *res = fp->f_offset;
2281 * lseek_args(int fd, int pad, off_t offset, int whence)
2283 * Reposition read/write file offset.
2286 sys_lseek(struct lseek_args *uap)
2290 error = kern_lseek(uap->fd, uap->offset, uap->whence,
2291 &uap->sysmsg_offset);
2297 kern_access(struct nlookupdata *nd, int aflags)
2302 if ((error = nlookup(nd)) != 0)
2305 error = cache_vget(&nd->nl_nch, nd->nl_cred, LK_EXCLUSIVE, &vp);
2309 /* Flags == 0 means only check for existence. */
2318 if ((flags & VWRITE) == 0 ||
2319 (error = vn_writechk(vp, &nd->nl_nch)) == 0)
2320 error = VOP_ACCESS(vp, flags, nd->nl_cred);
2323 * If the file handle is stale we have to re-resolve the
2324 * entry. This is a hack at the moment.
2326 if (error == ESTALE) {
2328 cache_setunresolved(&nd->nl_nch);
2329 error = cache_resolve(&nd->nl_nch, nd->nl_cred);
2342 * access_args(char *path, int flags)
2344 * Check access permissions.
2347 sys_access(struct access_args *uap)
2349 struct nlookupdata nd;
2352 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2354 error = kern_access(&nd, uap->flags);
2360 kern_stat(struct nlookupdata *nd, struct stat *st)
2366 if ((error = nlookup(nd)) != 0)
2369 if ((vp = nd->nl_nch.ncp->nc_vp) == NULL)
2373 if ((error = vget(vp, LK_SHARED)) != 0)
2375 error = vn_stat(vp, st, nd->nl_cred);
2378 * If the file handle is stale we have to re-resolve the entry. This
2379 * is a hack at the moment.
2381 if (error == ESTALE) {
2383 cache_setunresolved(&nd->nl_nch);
2384 error = cache_resolve(&nd->nl_nch, nd->nl_cred);
2394 * stat_args(char *path, struct stat *ub)
2396 * Get file status; this version follows links.
2399 sys_stat(struct stat_args *uap)
2401 struct nlookupdata nd;
2405 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2407 error = kern_stat(&nd, &st);
2409 error = copyout(&st, uap->ub, sizeof(*uap->ub));
2416 * lstat_args(char *path, struct stat *ub)
2418 * Get file status; this version does not follow links.
2421 sys_lstat(struct lstat_args *uap)
2423 struct nlookupdata nd;
2427 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2429 error = kern_stat(&nd, &st);
2431 error = copyout(&st, uap->ub, sizeof(*uap->ub));
2438 * pathconf_Args(char *path, int name)
2440 * Get configurable pathname variables.
2444 sys_pathconf(struct pathconf_args *uap)
2446 struct nlookupdata nd;
2451 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2453 error = nlookup(&nd);
2455 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);
2458 error = VOP_PATHCONF(vp, uap->name, uap->sysmsg_fds);
2466 * kern_readlink isn't properly split yet. There is a copyin burried
2467 * in VOP_READLINK().
2470 kern_readlink(struct nlookupdata *nd, char *buf, int count, int *res)
2472 struct thread *td = curthread;
2473 struct proc *p = td->td_proc;
2479 if ((error = nlookup(nd)) != 0)
2481 error = cache_vget(&nd->nl_nch, nd->nl_cred, LK_EXCLUSIVE, &vp);
2484 if (vp->v_type != VLNK) {
2487 aiov.iov_base = buf;
2488 aiov.iov_len = count;
2489 auio.uio_iov = &aiov;
2490 auio.uio_iovcnt = 1;
2491 auio.uio_offset = 0;
2492 auio.uio_rw = UIO_READ;
2493 auio.uio_segflg = UIO_USERSPACE;
2495 auio.uio_resid = count;
2496 error = VOP_READLINK(vp, &auio, p->p_ucred);
2499 *res = count - auio.uio_resid;
2504 * readlink_args(char *path, char *buf, int count)
2506 * Return target name of a symbolic link.
2509 sys_readlink(struct readlink_args *uap)
2511 struct nlookupdata nd;
2514 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2516 error = kern_readlink(&nd, uap->buf, uap->count,
2517 &uap->sysmsg_result);
2524 setfflags(struct vnode *vp, int flags)
2526 struct thread *td = curthread;
2527 struct proc *p = td->td_proc;
2532 * Prevent non-root users from setting flags on devices. When
2533 * a device is reused, users can retain ownership of the device
2534 * if they are allowed to set flags and programs assume that
2535 * chown can't fail when done as root.
2537 if ((vp->v_type == VCHR || vp->v_type == VBLK) &&
2538 ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0))
2542 * note: vget is required for any operation that might mod the vnode
2543 * so VINACTIVE is properly cleared.
2545 if ((error = vget(vp, LK_EXCLUSIVE)) == 0) {
2547 vattr.va_flags = flags;
2548 error = VOP_SETATTR(vp, &vattr, p->p_ucred);
2555 * chflags(char *path, int flags)
2557 * Change flags of a file given a path name.
2561 sys_chflags(struct chflags_args *uap)
2563 struct nlookupdata nd;
2568 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2569 /* XXX Add NLC flag indicating modifying operation? */
2571 error = nlookup(&nd);
2573 error = ncp_writechk(&nd.nl_nch);
2575 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp);
2578 error = setfflags(vp, uap->flags);
2585 * fchflags_args(int fd, int flags)
2587 * Change flags of a file given a file descriptor.
2591 sys_fchflags(struct fchflags_args *uap)
2593 struct thread *td = curthread;
2594 struct proc *p = td->td_proc;
2598 if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0)
2600 if (fp->f_nchandle.ncp)
2601 error = ncp_writechk(&fp->f_nchandle);
2603 error = setfflags((struct vnode *) fp->f_data, uap->flags);
2609 setfmode(struct vnode *vp, int mode)
2611 struct thread *td = curthread;
2612 struct proc *p = td->td_proc;
2617 * note: vget is required for any operation that might mod the vnode
2618 * so VINACTIVE is properly cleared.
2620 if ((error = vget(vp, LK_EXCLUSIVE)) == 0) {
2622 vattr.va_mode = mode & ALLPERMS;
2623 error = VOP_SETATTR(vp, &vattr, p->p_ucred);
2630 kern_chmod(struct nlookupdata *nd, int mode)
2635 /* XXX Add NLC flag indicating modifying operation? */
2636 if ((error = nlookup(nd)) != 0)
2638 if ((error = cache_vref(&nd->nl_nch, nd->nl_cred, &vp)) != 0)
2640 if ((error = ncp_writechk(&nd->nl_nch)) == 0)
2641 error = setfmode(vp, mode);
2647 * chmod_args(char *path, int mode)
2649 * Change mode of a file given path name.
2653 sys_chmod(struct chmod_args *uap)
2655 struct nlookupdata nd;
2658 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2660 error = kern_chmod(&nd, uap->mode);
2666 * lchmod_args(char *path, int mode)
2668 * Change mode of a file given path name (don't follow links.)
2672 sys_lchmod(struct lchmod_args *uap)
2674 struct nlookupdata nd;
2677 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2679 error = kern_chmod(&nd, uap->mode);
2685 * fchmod_args(int fd, int mode)
2687 * Change mode of a file given a file descriptor.
2691 sys_fchmod(struct fchmod_args *uap)
2693 struct thread *td = curthread;
2694 struct proc *p = td->td_proc;
2698 if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0)
2700 if (fp->f_nchandle.ncp)
2701 error = ncp_writechk(&fp->f_nchandle);
2703 error = setfmode((struct vnode *)fp->f_data, uap->mode);
2709 setfown(struct vnode *vp, uid_t uid, gid_t gid)
2711 struct thread *td = curthread;
2712 struct proc *p = td->td_proc;
2717 * note: vget is required for any operation that might mod the vnode
2718 * so VINACTIVE is properly cleared.
2720 if ((error = vget(vp, LK_EXCLUSIVE)) == 0) {
2724 error = VOP_SETATTR(vp, &vattr, p->p_ucred);
2731 kern_chown(struct nlookupdata *nd, int uid, int gid)
2736 /* XXX Add NLC flag indicating modifying operation? */
2737 if ((error = nlookup(nd)) != 0)
2739 if ((error = cache_vref(&nd->nl_nch, nd->nl_cred, &vp)) != 0)
2741 if ((error = ncp_writechk(&nd->nl_nch)) == 0)
2742 error = setfown(vp, uid, gid);
2748 * chown(char *path, int uid, int gid)
2750 * Set ownership given a path name.
2753 sys_chown(struct chown_args *uap)
2755 struct nlookupdata nd;
2758 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2760 error = kern_chown(&nd, uap->uid, uap->gid);
2766 * lchown_args(char *path, int uid, int gid)
2768 * Set ownership given a path name, do not cross symlinks.
2771 sys_lchown(struct lchown_args *uap)
2773 struct nlookupdata nd;
2776 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2778 error = kern_chown(&nd, uap->uid, uap->gid);
2784 * fchown_args(int fd, int uid, int gid)
2786 * Set ownership given a file descriptor.
2790 sys_fchown(struct fchown_args *uap)
2792 struct thread *td = curthread;
2793 struct proc *p = td->td_proc;
2797 if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0)
2799 if (fp->f_nchandle.ncp)
2800 error = ncp_writechk(&fp->f_nchandle);
2802 error = setfown((struct vnode *)fp->f_data, uap->uid, uap->gid);
2808 getutimes(const struct timeval *tvp, struct timespec *tsp)
2810 struct timeval tv[2];
2814 TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]);
2817 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]);
2818 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]);
2824 setutimes(struct vnode *vp, const struct timespec *ts, int nullflag)
2826 struct thread *td = curthread;
2827 struct proc *p = td->td_proc;
2832 * note: vget is required for any operation that might mod the vnode
2833 * so VINACTIVE is properly cleared.
2835 if ((error = vget(vp, LK_EXCLUSIVE)) == 0) {
2837 vattr.va_atime = ts[0];
2838 vattr.va_mtime = ts[1];
2840 vattr.va_vaflags |= VA_UTIMES_NULL;
2841 error = VOP_SETATTR(vp, &vattr, p->p_ucred);
2848 kern_utimes(struct nlookupdata *nd, struct timeval *tptr)
2850 struct timespec ts[2];
2854 if ((error = getutimes(tptr, ts)) != 0)
2856 /* XXX Add NLC flag indicating modifying operation? */
2857 if ((error = nlookup(nd)) != 0)
2859 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
2861 if ((error = cache_vref(&nd->nl_nch, nd->nl_cred, &vp)) != 0)
2863 error = setutimes(vp, ts, tptr == NULL);
2869 * utimes_args(char *path, struct timeval *tptr)
2871 * Set the access and modification times of a file.
2874 sys_utimes(struct utimes_args *uap)
2876 struct timeval tv[2];
2877 struct nlookupdata nd;
2881 error = copyin(uap->tptr, tv, sizeof(tv));
2885 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
2887 error = kern_utimes(&nd, uap->tptr ? tv : NULL);
2893 * lutimes_args(char *path, struct timeval *tptr)
2895 * Set the access and modification times of a file.
2898 sys_lutimes(struct lutimes_args *uap)
2900 struct timeval tv[2];
2901 struct nlookupdata nd;
2905 error = copyin(uap->tptr, tv, sizeof(tv));
2909 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
2911 error = kern_utimes(&nd, uap->tptr ? tv : NULL);
2917 kern_futimes(int fd, struct timeval *tptr)
2919 struct thread *td = curthread;
2920 struct proc *p = td->td_proc;
2921 struct timespec ts[2];
2925 error = getutimes(tptr, ts);
2928 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0)
2930 if (fp->f_nchandle.ncp)
2931 error = ncp_writechk(&fp->f_nchandle);
2933 error = setutimes((struct vnode *)fp->f_data, ts, tptr == NULL);
2939 * futimes_args(int fd, struct timeval *tptr)
2941 * Set the access and modification times of a file.
2944 sys_futimes(struct futimes_args *uap)
2946 struct timeval tv[2];
2950 error = copyin(uap->tptr, tv, sizeof(tv));
2955 error = kern_futimes(uap->fd, uap->tptr ? tv : NULL);
2961 kern_truncate(struct nlookupdata *nd, off_t length)
2969 /* XXX Add NLC flag indicating modifying operation? */
2970 if ((error = nlookup(nd)) != 0)
2972 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
2974 if ((error = cache_vref(&nd->nl_nch, nd->nl_cred, &vp)) != 0)
2976 if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY)) != 0) {
2980 if (vp->v_type == VDIR) {
2982 } else if ((error = vn_writechk(vp, &nd->nl_nch)) == 0 &&
2983 (error = VOP_ACCESS(vp, VWRITE, nd->nl_cred)) == 0) {
2985 vattr.va_size = length;
2986 error = VOP_SETATTR(vp, &vattr, nd->nl_cred);
2993 * truncate(char *path, int pad, off_t length)
2995 * Truncate a file given its path name.
2998 sys_truncate(struct truncate_args *uap)
3000 struct nlookupdata nd;
3003 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
3005 error = kern_truncate(&nd, uap->length);
3011 kern_ftruncate(int fd, off_t length)
3013 struct thread *td = curthread;
3014 struct proc *p = td->td_proc;
3022 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0)
3024 if (fp->f_nchandle.ncp) {
3025 error = ncp_writechk(&fp->f_nchandle);
3029 if ((fp->f_flag & FWRITE) == 0) {
3033 vp = (struct vnode *)fp->f_data;
3034 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3035 if (vp->v_type == VDIR) {
3037 } else if ((error = vn_writechk(vp, NULL)) == 0) {
3039 vattr.va_size = length;
3040 error = VOP_SETATTR(vp, &vattr, fp->f_cred);
3049 * ftruncate_args(int fd, int pad, off_t length)
3051 * Truncate a file given a file descriptor.
3054 sys_ftruncate(struct ftruncate_args *uap)
3058 error = kern_ftruncate(uap->fd, uap->length);
3066 * Sync an open file.
3070 sys_fsync(struct fsync_args *uap)
3072 struct thread *td = curthread;
3073 struct proc *p = td->td_proc;
3079 if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0)
3081 vp = (struct vnode *)fp->f_data;
3082 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3083 if ((obj = vp->v_object) != NULL)
3084 vm_object_page_clean(obj, 0, 0, 0);
3085 if ((error = VOP_FSYNC(vp, MNT_WAIT)) == 0 && vp->v_mount)
3086 error = buf_fsync(vp);
3093 kern_rename(struct nlookupdata *fromnd, struct nlookupdata *tond)
3095 struct nchandle fnchd;
3096 struct nchandle tnchd;
3097 struct namecache *ncp;
3104 fromnd->nl_flags |= NLC_REFDVP;
3105 if ((error = nlookup(fromnd)) != 0)
3107 if ((fnchd.ncp = fromnd->nl_nch.ncp->nc_parent) == NULL)
3109 fnchd.mount = fromnd->nl_nch.mount;
3113 * unlock the source nch so we can lookup the target nch without
3114 * deadlocking. The target may or may not exist so we do not check
3115 * for a target vp like kern_mkdir() and other creation functions do.
3117 * The source and target directories are ref'd and rechecked after
3118 * everything is relocked to determine if the source or target file
3121 KKASSERT(fromnd->nl_flags & NLC_NCPISLOCKED);
3122 fromnd->nl_flags &= ~NLC_NCPISLOCKED;
3123 cache_unlock(&fromnd->nl_nch);
3125 tond->nl_flags |= NLC_CREATE | NLC_REFDVP;
3126 if ((error = nlookup(tond)) != 0) {
3130 if ((tnchd.ncp = tond->nl_nch.ncp->nc_parent) == NULL) {
3134 tnchd.mount = tond->nl_nch.mount;
3138 * If the source and target are the same there is nothing to do
3140 if (fromnd->nl_nch.ncp == tond->nl_nch.ncp) {
3147 * Mount points cannot be renamed or overwritten
3149 if ((fromnd->nl_nch.ncp->nc_flag | tond->nl_nch.ncp->nc_flag) &
3158 * relock the source ncp. NOTE AFTER RELOCKING: the source ncp
3159 * may have become invalid while it was unlocked, nc_vp and nc_mount
3162 if (cache_lock_nonblock(&fromnd->nl_nch) == 0) {
3163 cache_resolve(&fromnd->nl_nch, fromnd->nl_cred);
3164 } else if (fromnd->nl_nch.ncp > tond->nl_nch.ncp) {
3165 cache_lock(&fromnd->nl_nch);
3166 cache_resolve(&fromnd->nl_nch, fromnd->nl_cred);
3168 cache_unlock(&tond->nl_nch);
3169 cache_lock(&fromnd->nl_nch);
3170 cache_resolve(&fromnd->nl_nch, fromnd->nl_cred);
3171 cache_lock(&tond->nl_nch);
3172 cache_resolve(&tond->nl_nch, tond->nl_cred);
3174 fromnd->nl_flags |= NLC_NCPISLOCKED;
3177 * make sure the parent directories linkages are the same
3179 if (fnchd.ncp != fromnd->nl_nch.ncp->nc_parent ||
3180 tnchd.ncp != tond->nl_nch.ncp->nc_parent) {
3187 * Both the source and target must be within the same filesystem and
3188 * in the same filesystem as their parent directories within the
3189 * namecache topology.
3191 * NOTE: fromnd's nc_mount or nc_vp could be NULL.
3194 if (mp != tnchd.mount || mp != fromnd->nl_nch.mount ||
3195 mp != tond->nl_nch.mount) {
3202 * Make sure the mount point is writable
3204 if ((error = ncp_writechk(&tond->nl_nch)) != 0) {
3211 * If the target exists and either the source or target is a directory,
3212 * then both must be directories.
3214 * Due to relocking of the source, fromnd->nl_nch.ncp->nc_vp might h
3217 if (tond->nl_nch.ncp->nc_vp) {
3218 if (fromnd->nl_nch.ncp->nc_vp == NULL) {
3220 } else if (fromnd->nl_nch.ncp->nc_vp->v_type == VDIR) {
3221 if (tond->nl_nch.ncp->nc_vp->v_type != VDIR)
3223 } else if (tond->nl_nch.ncp->nc_vp->v_type == VDIR) {
3229 * You cannot rename a source into itself or a subdirectory of itself.
3230 * We check this by travsersing the target directory upwards looking
3231 * for a match against the source.
3234 for (ncp = tnchd.ncp; ncp; ncp = ncp->nc_parent) {
3235 if (fromnd->nl_nch.ncp == ncp) {
3246 * Even though the namespaces are different, they may still represent
3247 * hardlinks to the same file. The filesystem might have a hard time
3248 * with this so we issue a NREMOVE of the source instead of a NRENAME
3249 * when we detect the situation.
3252 fdvp = fromnd->nl_dvp;
3253 tdvp = tond->nl_dvp;
3254 if (fdvp == NULL || tdvp == NULL) {
3256 } else if (fromnd->nl_nch.ncp->nc_vp == tond->nl_nch.ncp->nc_vp) {
3257 error = VOP_NREMOVE(&fromnd->nl_nch, fdvp,
3260 error = VOP_NRENAME(&fromnd->nl_nch, &tond->nl_nch,
3261 fdvp, tdvp, tond->nl_cred);
3268 * rename_args(char *from, char *to)
3270 * Rename files. Source and destination must either both be directories,
3271 * or both not be directories. If target is a directory, it must be empty.
3274 sys_rename(struct rename_args *uap)
3276 struct nlookupdata fromnd, tond;
3279 error = nlookup_init(&fromnd, uap->from, UIO_USERSPACE, 0);
3281 error = nlookup_init(&tond, uap->to, UIO_USERSPACE, 0);
3283 error = kern_rename(&fromnd, &tond);
3284 nlookup_done(&tond);
3286 nlookup_done(&fromnd);
3291 kern_mkdir(struct nlookupdata *nd, int mode)
3293 struct thread *td = curthread;
3294 struct proc *p = td->td_proc;
3300 nd->nl_flags |= NLC_WILLBEDIR | NLC_CREATE | NLC_REFDVP;
3301 if ((error = nlookup(nd)) != 0)
3304 if (nd->nl_nch.ncp->nc_vp)
3306 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
3309 vattr.va_type = VDIR;
3310 vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_fd->fd_cmask;
3313 error = VOP_NMKDIR(&nd->nl_nch, nd->nl_dvp, &vp, p->p_ucred, &vattr);
3320 * mkdir_args(char *path, int mode)
3322 * Make a directory file.
3326 sys_mkdir(struct mkdir_args *uap)
3328 struct nlookupdata nd;
3331 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
3333 error = kern_mkdir(&nd, uap->mode);
3339 kern_rmdir(struct nlookupdata *nd)
3344 nd->nl_flags |= NLC_DELETE | NLC_REFDVP;
3345 if ((error = nlookup(nd)) != 0)
3349 * Do not allow directories representing mount points to be
3350 * deleted, even if empty. Check write perms on mount point
3351 * in case the vnode is aliased (aka nullfs).
3353 if (nd->nl_nch.ncp->nc_flag & (NCF_ISMOUNTPT))
3355 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
3357 error = VOP_NRMDIR(&nd->nl_nch, nd->nl_dvp, nd->nl_cred);
3362 * rmdir_args(char *path)
3364 * Remove a directory file.
3368 sys_rmdir(struct rmdir_args *uap)
3370 struct nlookupdata nd;
3373 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0);
3375 error = kern_rmdir(&nd);
3381 kern_getdirentries(int fd, char *buf, u_int count, long *basep, int *res,
3382 enum uio_seg direction)
3384 struct thread *td = curthread;
3385 struct proc *p = td->td_proc;
3393 if ((error = holdvnode(p->p_fd, fd, &fp)) != 0)
3395 if ((fp->f_flag & FREAD) == 0) {
3399 vp = (struct vnode *)fp->f_data;
3401 if (vp->v_type != VDIR) {
3405 aiov.iov_base = buf;
3406 aiov.iov_len = count;
3407 auio.uio_iov = &aiov;
3408 auio.uio_iovcnt = 1;
3409 auio.uio_rw = UIO_READ;
3410 auio.uio_segflg = direction;
3412 auio.uio_resid = count;
3413 loff = auio.uio_offset = fp->f_offset;
3414 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, NULL);
3415 fp->f_offset = auio.uio_offset;
3418 if (count == auio.uio_resid) {
3419 if (union_dircheckp) {
3420 error = union_dircheckp(td, &vp, fp);
3427 if ((vp->v_flag & VROOT) &&
3428 (vp->v_mount->mnt_flag & MNT_UNION)) {
3429 struct vnode *tvp = vp;
3430 vp = vp->v_mount->mnt_vnodecovered;
3441 * WARNING! *basep may not be wide enough to accomodate the
3442 * seek offset. XXX should we hack this to return the upper 32 bits
3443 * for offsets greater then 4G?
3446 *basep = (long)loff;
3448 *res = count - auio.uio_resid;
3455 * getdirentries_args(int fd, char *buf, u_int conut, long *basep)
3457 * Read a block of directory entries in a file system independent format.
3460 sys_getdirentries(struct getdirentries_args *uap)
3465 error = kern_getdirentries(uap->fd, uap->buf, uap->count, &base,
3466 &uap->sysmsg_result, UIO_USERSPACE);
3468 if (error == 0 && uap->basep)
3469 error = copyout(&base, uap->basep, sizeof(*uap->basep));
3474 * getdents_args(int fd, char *buf, size_t count)
3477 sys_getdents(struct getdents_args *uap)
3481 error = kern_getdirentries(uap->fd, uap->buf, uap->count, NULL,
3482 &uap->sysmsg_result, UIO_USERSPACE);
3488 * umask(int newmask)
3490 * Set the mode mask for creation of filesystem nodes.
3495 sys_umask(struct umask_args *uap)
3497 struct thread *td = curthread;
3498 struct proc *p = td->td_proc;
3499 struct filedesc *fdp;
3502 uap->sysmsg_result = fdp->fd_cmask;
3503 fdp->fd_cmask = uap->newmask & ALLPERMS;
3508 * revoke(char *path)
3510 * Void all references to file by ripping underlying filesystem
3515 sys_revoke(struct revoke_args *uap)
3517 struct nlookupdata nd;
3524 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
3526 error = nlookup(&nd);
3528 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp);
3529 cred = crhold(nd.nl_cred);
3532 if (vp->v_type != VCHR && vp->v_type != VBLK)
3535 error = VOP_GETATTR(vp, &vattr);
3536 if (error == 0 && cred->cr_uid != vattr.va_uid)
3537 error = suser_cred(cred, PRISON_ROOT);
3538 if (error == 0 && count_udev(vp->v_umajor, vp->v_uminor) > 0) {
3541 VOP_REVOKE(vp, REVOKEALL);
3552 * getfh_args(char *fname, fhandle_t *fhp)
3554 * Get (NFS) file handle
3557 sys_getfh(struct getfh_args *uap)
3559 struct thread *td = curthread;
3560 struct nlookupdata nd;
3566 * Must be super user
3568 if ((error = suser(td)) != 0)
3572 error = nlookup_init(&nd, uap->fname, UIO_USERSPACE, NLC_FOLLOW);
3574 error = nlookup(&nd);
3576 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);
3579 bzero(&fh, sizeof(fh));
3580 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
3581 error = VFS_VPTOFH(vp, &fh.fh_fid);
3584 error = copyout(&fh, uap->fhp, sizeof(fh));
3590 * fhopen_args(const struct fhandle *u_fhp, int flags)
3592 * syscall for the rpc.lockd to use to translate a NFS file handle into
3593 * an open descriptor.
3595 * warning: do not remove the suser() call or this becomes one giant
3599 sys_fhopen(struct fhopen_args *uap)
3601 struct thread *td = curthread;
3602 struct proc *p = td->td_proc;
3607 struct vattr *vap = &vat;
3609 int fmode, mode, error, type;
3615 * Must be super user
3621 fmode = FFLAGS(uap->flags);
3622 /* why not allow a non-read/write open for our lockd? */
3623 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT))
3625 error = copyin(uap->u_fhp, &fhp, sizeof(fhp));
3628 /* find the mount point */
3629 mp = vfs_getvfs(&fhp.fh_fsid);
3632 /* now give me my vnode, it gets returned to me locked */
3633 error = VFS_FHTOVP(mp, &fhp.fh_fid, &vp);
3637 * from now on we have to make sure not
3638 * to forget about the vnode
3639 * any error that causes an abort must vput(vp)
3640 * just set error = err and 'goto bad;'.
3646 if (vp->v_type == VLNK) {
3650 if (vp->v_type == VSOCK) {
3655 if (fmode & (FWRITE | O_TRUNC)) {
3656 if (vp->v_type == VDIR) {
3660 error = vn_writechk(vp, NULL);
3668 error = VOP_ACCESS(vp, mode, p->p_ucred);
3672 if (fmode & O_TRUNC) {
3673 vn_unlock(vp); /* XXX */
3674 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */
3677 error = VOP_SETATTR(vp, vap, p->p_ucred);
3683 * VOP_OPEN needs the file pointer so it can potentially override
3686 * WARNING! no f_nchandle will be associated when fhopen()ing a
3689 if ((error = falloc(p, &nfp, &indx)) != 0)
3693 error = VOP_OPEN(vp, fmode, p->p_ucred, fp);
3696 * setting f_ops this way prevents VOP_CLOSE from being
3697 * called or fdrop() releasing the vp from v_data. Since
3698 * the VOP_OPEN failed we don't want to VOP_CLOSE.
3700 fp->f_ops = &badfileops;
3706 * The fp is given its own reference, we still have our ref and lock.
3708 * Assert that all regular files must be created with a VM object.
3710 if (vp->v_type == VREG && vp->v_object == NULL) {
3711 kprintf("fhopen: regular file did not have VM object: %p\n", vp);
3716 * The open was successful. Handle any locking requirements.
3718 if (fmode & (O_EXLOCK | O_SHLOCK)) {
3719 lf.l_whence = SEEK_SET;
3722 if (fmode & O_EXLOCK)
3723 lf.l_type = F_WRLCK;
3725 lf.l_type = F_RDLCK;
3726 if (fmode & FNONBLOCK)
3731 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) {
3733 * release our private reference.
3735 fsetfd(p, NULL, indx);
3740 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3741 fp->f_flag |= FHASLOCK;
3745 * Clean up. Associate the file pointer with the previously
3746 * reserved descriptor and return it.
3749 fsetfd(p, fp, indx);
3751 uap->sysmsg_result = indx;
3755 fsetfd(p, NULL, indx);
3763 * fhstat_args(struct fhandle *u_fhp, struct stat *sb)
3766 sys_fhstat(struct fhstat_args *uap)
3768 struct thread *td = curthread;
3776 * Must be super user
3782 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t));
3786 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
3788 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
3790 error = vn_stat(vp, &sb, td->td_proc->p_ucred);
3794 error = copyout(&sb, uap->sb, sizeof(sb));
3799 * fhstatfs_args(struct fhandle *u_fhp, struct statfs *buf)
3802 sys_fhstatfs(struct fhstatfs_args *uap)
3804 struct thread *td = curthread;
3805 struct proc *p = td->td_proc;
3810 char *fullpath, *freepath;
3815 * Must be super user
3817 if ((error = suser(td)))
3820 if ((error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t))) != 0)
3823 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
3826 if (p != NULL && !chroot_visible_mnt(mp, p))
3829 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
3834 if ((error = VFS_STATFS(mp, sp, p->p_ucred)) != 0)
3837 error = mount_path(p, mp, &fullpath, &freepath);
3840 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
3841 strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname));
3842 kfree(freepath, M_TEMP);
3844 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
3846 bcopy(sp, &sb, sizeof(sb));
3847 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
3850 return (copyout(sp, uap->buf, sizeof(*sp)));
3854 * fhstatvfs_args(struct fhandle *u_fhp, struct statvfs *buf)
3857 sys_fhstatvfs(struct fhstatvfs_args *uap)
3859 struct thread *td = curthread;
3860 struct proc *p = td->td_proc;
3868 * Must be super user
3870 if ((error = suser(td)))
3873 if ((error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t))) != 0)
3876 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
3879 if (p != NULL && !chroot_visible_mnt(mp, p))
3882 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
3885 sp = &mp->mnt_vstat;
3887 if ((error = VFS_STATVFS(mp, sp, p->p_ucred)) != 0)
3891 if (mp->mnt_flag & MNT_RDONLY)
3892 sp->f_flag |= ST_RDONLY;
3893 if (mp->mnt_flag & MNT_NOSUID)
3894 sp->f_flag |= ST_NOSUID;
3896 return (copyout(sp, uap->buf, sizeof(*sp)));
3901 * Syscall to push extended attribute configuration information into the
3902 * VFS. Accepts a path, which it converts to a mountpoint, as well as
3903 * a command (int cmd), and attribute name and misc data. For now, the
3904 * attribute name is left in userspace for consumption by the VFS_op.
3905 * It will probably be changed to be copied into sysspace by the
3906 * syscall in the future, once issues with various consumers of the
3907 * attribute code have raised their hands.
3909 * Currently this is used only by UFS Extended Attributes.
3912 sys_extattrctl(struct extattrctl_args *uap)
3914 struct nlookupdata nd;
3920 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
3922 error = nlookup(&nd);
3924 mp = nd.nl_nch.mount;
3925 error = VFS_EXTATTRCTL(mp, uap->cmd,
3926 uap->attrname, uap->arg,
3934 * Syscall to set a named extended attribute on a file or directory.
3935 * Accepts attribute name, and a uio structure pointing to the data to set.
3936 * The uio is consumed in the style of writev(). The real work happens
3937 * in VOP_SETEXTATTR().
3940 sys_extattr_set_file(struct extattr_set_file_args *uap)
3942 char attrname[EXTATTR_MAXNAMELEN];
3943 struct iovec aiov[UIO_SMALLIOV];
3944 struct iovec *needfree;
3945 struct nlookupdata nd;
3954 error = copyin(uap->attrname, attrname, EXTATTR_MAXNAMELEN);
3959 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
3961 error = nlookup(&nd);
3963 error = ncp_writechk(&nd.nl_nch);
3965 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);
3972 iovlen = uap->iovcnt * sizeof(struct iovec);
3973 if (uap->iovcnt > UIO_SMALLIOV) {
3974 if (uap->iovcnt > UIO_MAXIOV) {
3978 MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK);
3984 auio.uio_iovcnt = uap->iovcnt;
3985 auio.uio_rw = UIO_WRITE;
3986 auio.uio_segflg = UIO_USERSPACE;
3987 auio.uio_td = nd.nl_td;
3988 auio.uio_offset = 0;
3989 if ((error = copyin(uap->iovp, iov, iovlen)))
3992 for (i = 0; i < uap->iovcnt; i++) {
3993 if (iov->iov_len > INT_MAX - auio.uio_resid) {
3997 auio.uio_resid += iov->iov_len;
4000 cnt = auio.uio_resid;
4001 error = VOP_SETEXTATTR(vp, attrname, &auio, nd.nl_cred);
4002 cnt -= auio.uio_resid;
4003 uap->sysmsg_result = cnt;
4008 FREE(needfree, M_IOV);
4013 * Syscall to get a named extended attribute on a file or directory.
4014 * Accepts attribute name, and a uio structure pointing to a buffer for the
4015 * data. The uio is consumed in the style of readv(). The real work
4016 * happens in VOP_GETEXTATTR();
4019 sys_extattr_get_file(struct extattr_get_file_args *uap)
4021 char attrname[EXTATTR_MAXNAMELEN];
4022 struct iovec aiov[UIO_SMALLIOV];
4023 struct iovec *needfree;
4024 struct nlookupdata nd;
4033 error = copyin(uap->attrname, attrname, EXTATTR_MAXNAMELEN);
4038 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
4040 error = nlookup(&nd);
4042 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);
4048 iovlen = uap->iovcnt * sizeof (struct iovec);
4050 if (uap->iovcnt > UIO_SMALLIOV) {
4051 if (uap->iovcnt > UIO_MAXIOV) {
4055 MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK);
4061 auio.uio_iovcnt = uap->iovcnt;
4062 auio.uio_rw = UIO_READ;
4063 auio.uio_segflg = UIO_USERSPACE;
4064 auio.uio_td = nd.nl_td;
4065 auio.uio_offset = 0;
4066 if ((error = copyin(uap->iovp, iov, iovlen)))
4069 for (i = 0; i < uap->iovcnt; i++) {
4070 if (iov->iov_len > INT_MAX - auio.uio_resid) {
4074 auio.uio_resid += iov->iov_len;
4077 cnt = auio.uio_resid;
4078 error = VOP_GETEXTATTR(vp, attrname, &auio, nd.nl_cred);
4079 cnt -= auio.uio_resid;
4080 uap->sysmsg_result = cnt;
4085 FREE(needfree, M_IOV);
4090 * Syscall to delete a named extended attribute from a file or directory.
4091 * Accepts attribute name. The real work happens in VOP_SETEXTATTR().
4094 sys_extattr_delete_file(struct extattr_delete_file_args *uap)
4096 char attrname[EXTATTR_MAXNAMELEN];
4097 struct nlookupdata nd;
4101 error = copyin(uap->attrname, attrname, EXTATTR_MAXNAMELEN);
4106 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
4108 error = nlookup(&nd);
4110 error = ncp_writechk(&nd.nl_nch);
4112 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);
4118 error = VOP_SETEXTATTR(vp, attrname, NULL, nd.nl_cred);
4125 * Determine if the mount is visible to the process.
4128 chroot_visible_mnt(struct mount *mp, struct proc *p)
4130 struct nchandle nch;
4133 * Traverse from the mount point upwards. If we hit the process
4134 * root then the mount point is visible to the process.
4136 nch = mp->mnt_ncmountpt;
4138 if (nch.mount == p->p_fd->fd_nrdir.mount &&
4139 nch.ncp == p->p_fd->fd_nrdir.ncp) {
4142 if (nch.ncp == nch.mount->mnt_ncmountpt.ncp) {
4143 nch = nch.mount->mnt_ncmounton;
4145 nch.ncp = nch.ncp->nc_parent;
4150 * If the mount point is not visible to the process, but the
4151 * process root is in a subdirectory of the mount, return
4154 if (p->p_fd->fd_nrdir.mount == mp)