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. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94
35 * $FreeBSD: src/sys/kern/vfs_syscalls.c,v 1.151.2.18 2003/04/04 20:35:58 tegge Exp $
38 #include <sys/param.h>
39 #include <sys/systm.h>
42 #include <sys/sysent.h>
43 #include <sys/malloc.h>
44 #include <sys/mount.h>
45 #include <sys/mountctl.h>
46 #include <sys/sysproto.h>
47 #include <sys/filedesc.h>
48 #include <sys/kernel.h>
49 #include <sys/fcntl.h>
51 #include <sys/linker.h>
53 #include <sys/unistd.h>
54 #include <sys/vnode.h>
58 #include <sys/namei.h>
59 #include <sys/nlookup.h>
60 #include <sys/dirent.h>
61 #include <sys/extattr.h>
62 #include <sys/spinlock.h>
63 #include <sys/kern_syscall.h>
64 #include <sys/objcache.h>
65 #include <sys/sysctl.h>
68 #include <sys/file2.h>
69 #include <sys/spinlock2.h>
70 #include <sys/mplock2.h>
73 #include <vm/vm_object.h>
74 #include <vm/vm_page.h>
76 #include <machine/limits.h>
77 #include <machine/stdarg.h>
79 static void mount_warning(struct mount
*mp
, const char *ctl
, ...)
81 static int mount_path(struct proc
*p
, struct mount
*mp
, char **rb
, char **fb
);
82 static int checkvp_chdir (struct vnode
*vn
, struct thread
*td
);
83 static void checkdirs (struct nchandle
*old_nch
, struct nchandle
*new_nch
);
84 static int chroot_refuse_vdir_fds (struct filedesc
*fdp
);
85 static int chroot_visible_mnt(struct mount
*mp
, struct proc
*p
);
86 static int getutimes (struct timeval
*, struct timespec
*);
87 static int getutimens (const struct timespec
*, struct timespec
*, int *);
88 static int setfown (struct mount
*, struct vnode
*, uid_t
, gid_t
);
89 static int setfmode (struct vnode
*, int);
90 static int setfflags (struct vnode
*, int);
91 static int setutimes (struct vnode
*, struct vattr
*,
92 const struct timespec
*, int);
93 static int usermount
= 0; /* if 1, non-root can mount fs. */
95 SYSCTL_INT(_vfs
, OID_AUTO
, usermount
, CTLFLAG_RW
, &usermount
, 0,
96 "Allow non-root users to mount filesystems");
99 * Virtual File System System Calls
103 * Mount a file system.
105 * mount_args(char *type, char *path, int flags, caddr_t data)
110 sys_mount(struct mount_args
*uap
)
112 struct thread
*td
= curthread
;
115 struct mount
*mp
, *nullmp
;
116 struct vfsconf
*vfsp
;
117 int error
, flag
= 0, flag2
= 0;
120 struct nlookupdata nd
;
121 char fstypename
[MFSNAMELEN
];
129 if (usermount
== 0 && (error
= priv_check(td
, PRIV_ROOT
)))
133 * Do not allow NFS export by non-root users.
135 if (uap
->flags
& MNT_EXPORTED
) {
136 error
= priv_check(td
, PRIV_ROOT
);
141 * Silently enforce MNT_NOSUID and MNT_NODEV for non-root users
143 if (priv_check(td
, PRIV_ROOT
))
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 * If the target filesystem is resolved via a nullfs mount, then
163 * nd.nl_nch.mount will be pointing to the nullfs mount structure
164 * instead of the target file system. We need it in case we are
167 nullmp
= nd
.nl_nch
.mount
;
170 * Extract the locked+refd ncp and cleanup the nd structure
173 cache_zero(&nd
.nl_nch
);
176 if ((nch
.ncp
->nc_flag
& NCF_ISMOUNTPT
) &&
177 (mp
= cache_findmount(&nch
)) != NULL
) {
186 * now we have the locked ref'd nch and unreferenced vnode.
189 if ((error
= vget(vp
, LK_EXCLUSIVE
)) != 0) {
196 * Extract the file system type. We need to know this early, to take
197 * appropriate actions if we are dealing with a nullfs.
199 if ((error
= copyinstr(uap
->type
, fstypename
, MFSNAMELEN
, NULL
)) != 0) {
206 * Now we have an unlocked ref'd nch and a locked ref'd vp
208 if (uap
->flags
& MNT_UPDATE
) {
209 if ((vp
->v_flag
& (VROOT
|VPFSROOT
)) == 0) {
216 if (strncmp(fstypename
, "null", 5) == 0) {
224 flag2
= mp
->mnt_kern_flag
;
226 * We only allow the filesystem to be reloaded if it
227 * is currently mounted read-only.
229 if ((uap
->flags
& MNT_RELOAD
) &&
230 ((mp
->mnt_flag
& MNT_RDONLY
) == 0)) {
233 error
= EOPNOTSUPP
; /* Needs translation */
237 * Only root, or the user that did the original mount is
238 * permitted to update it.
240 if (mp
->mnt_stat
.f_owner
!= cred
->cr_uid
&&
241 (error
= priv_check(td
, PRIV_ROOT
))) {
246 if (vfs_busy(mp
, LK_NOWAIT
)) {
260 uap
->flags
& (MNT_RELOAD
| MNT_FORCE
| MNT_UPDATE
);
261 lwkt_gettoken(&mp
->mnt_token
);
267 * If the user is not root, ensure that they own the directory
268 * onto which we are attempting to mount.
270 if ((error
= VOP_GETATTR(vp
, &va
)) ||
271 (va
.va_uid
!= cred
->cr_uid
&&
272 (error
= priv_check(td
, PRIV_ROOT
)))) {
277 if ((error
= vinvalbuf(vp
, V_SAVE
, 0, 0)) != 0) {
282 if (vp
->v_type
!= VDIR
) {
288 if (vp
->v_mount
->mnt_kern_flag
& MNTK_NOSTKMNT
) {
294 vfsp
= vfsconf_find_by_name(fstypename
);
298 /* Only load modules for root (very important!) */
299 if ((error
= priv_check(td
, PRIV_ROOT
)) != 0) {
304 error
= linker_load_file(fstypename
, &lf
);
305 if (error
|| lf
== NULL
) {
313 /* lookup again, see if the VFS was loaded */
314 vfsp
= vfsconf_find_by_name(fstypename
);
317 linker_file_unload(lf
);
332 * Allocate and initialize the filesystem.
334 mp
= kmalloc(sizeof(struct mount
), M_MOUNT
, M_ZERO
|M_WAITOK
);
336 vfs_busy(mp
, LK_NOWAIT
);
337 mp
->mnt_op
= vfsp
->vfc_vfsops
;
339 vfsp
->vfc_refcount
++;
340 mp
->mnt_stat
.f_type
= vfsp
->vfc_typenum
;
341 mp
->mnt_flag
|= vfsp
->vfc_flags
& MNT_VISFLAGMASK
;
342 strncpy(mp
->mnt_stat
.f_fstypename
, vfsp
->vfc_name
, MFSNAMELEN
);
343 mp
->mnt_stat
.f_owner
= cred
->cr_uid
;
344 lwkt_gettoken(&mp
->mnt_token
);
348 * (per-mount token acquired at this point)
350 * Set the mount level flags.
352 if (uap
->flags
& MNT_RDONLY
)
353 mp
->mnt_flag
|= MNT_RDONLY
;
354 else if (mp
->mnt_flag
& MNT_RDONLY
)
355 mp
->mnt_kern_flag
|= MNTK_WANTRDWR
;
356 mp
->mnt_flag
&=~ (MNT_NOSUID
| MNT_NOEXEC
| MNT_NODEV
|
357 MNT_SYNCHRONOUS
| MNT_ASYNC
| MNT_NOATIME
|
358 MNT_NOSYMFOLLOW
| MNT_IGNORE
| MNT_TRIM
|
359 MNT_NOCLUSTERR
| MNT_NOCLUSTERW
| MNT_SUIDDIR
|
361 mp
->mnt_flag
|= uap
->flags
& (MNT_NOSUID
| MNT_NOEXEC
|
362 MNT_NODEV
| MNT_SYNCHRONOUS
| MNT_ASYNC
| MNT_FORCE
|
363 MNT_NOSYMFOLLOW
| MNT_IGNORE
| MNT_TRIM
|
364 MNT_NOATIME
| MNT_NOCLUSTERR
| MNT_NOCLUSTERW
| MNT_SUIDDIR
|
367 * Mount the filesystem.
368 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
371 error
= VFS_MOUNT(mp
, uap
->path
, uap
->data
, cred
);
372 if (mp
->mnt_flag
& MNT_UPDATE
) {
373 if (mp
->mnt_kern_flag
& MNTK_WANTRDWR
)
374 mp
->mnt_flag
&= ~MNT_RDONLY
;
375 mp
->mnt_flag
&=~ (MNT_UPDATE
| MNT_RELOAD
| MNT_FORCE
);
376 mp
->mnt_kern_flag
&=~ MNTK_WANTRDWR
;
379 mp
->mnt_kern_flag
= flag2
;
381 lwkt_reltoken(&mp
->mnt_token
);
387 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
390 * Put the new filesystem on the mount list after root. The mount
391 * point gets its own mnt_ncmountpt (unless the VFS already set one
392 * up) which represents the root of the mount. The lookup code
393 * detects the mount point going forward and checks the root of
394 * the mount going backwards.
396 * It is not necessary to invalidate or purge the vnode underneath
397 * because elements under the mount will be given their own glue
401 if (mp
->mnt_ncmountpt
.ncp
== NULL
) {
403 * allocate, then unlock, but leave the ref intact
405 cache_allocroot(&mp
->mnt_ncmountpt
, mp
, NULL
);
406 cache_unlock(&mp
->mnt_ncmountpt
);
409 mp
->mnt_ncmounton
= nch
; /* inherits ref */
411 nch
.ncp
->nc_flag
|= NCF_ISMOUNTPT
;
413 cache_ismounting(mp
);
414 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
416 mountlist_insert(mp
, MNTINS_LAST
);
418 checkdirs(&mp
->mnt_ncmounton
, &mp
->mnt_ncmountpt
);
419 error
= vfs_allocate_syncvnode(mp
);
420 lwkt_reltoken(&mp
->mnt_token
);
422 error
= VFS_START(mp
, 0);
424 KNOTE(&fs_klist
, VQ_MOUNT
);
426 vn_syncer_thr_stop(mp
);
427 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_coherency_ops
);
428 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_journal_ops
);
429 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_norm_ops
);
430 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_spec_ops
);
431 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_fifo_ops
);
432 mp
->mnt_vfc
->vfc_refcount
--;
433 lwkt_reltoken(&mp
->mnt_token
);
444 * Scan all active processes to see if any of them have a current
445 * or root directory onto which the new filesystem has just been
446 * mounted. If so, replace them with the new mount point.
448 * Both old_nch and new_nch are ref'd on call but not locked.
449 * new_nch must be temporarily locked so it can be associated with the
450 * vnode representing the root of the mount point.
452 struct checkdirs_info
{
453 struct nchandle old_nch
;
454 struct nchandle new_nch
;
455 struct vnode
*old_vp
;
456 struct vnode
*new_vp
;
459 static int checkdirs_callback(struct proc
*p
, void *data
);
462 checkdirs(struct nchandle
*old_nch
, struct nchandle
*new_nch
)
464 struct checkdirs_info info
;
470 * If the old mount point's vnode has a usecount of 1, it is not
471 * being held as a descriptor anywhere.
473 olddp
= old_nch
->ncp
->nc_vp
;
474 if (olddp
== NULL
|| VREFCNT(olddp
) == 1)
478 * Force the root vnode of the new mount point to be resolved
479 * so we can update any matching processes.
482 if (VFS_ROOT(mp
, &newdp
))
483 panic("mount: lost mount");
486 vn_lock(newdp
, LK_EXCLUSIVE
| LK_RETRY
);
487 cache_setunresolved(new_nch
);
488 cache_setvp(new_nch
, newdp
);
489 cache_unlock(new_nch
);
492 * Special handling of the root node
494 if (rootvnode
== olddp
) {
496 vfs_cache_setroot(newdp
, cache_hold(new_nch
));
500 * Pass newdp separately so the callback does not have to access
501 * it via new_nch->ncp->nc_vp.
503 info
.old_nch
= *old_nch
;
504 info
.new_nch
= *new_nch
;
506 allproc_scan(checkdirs_callback
, &info
);
511 * NOTE: callback is not MP safe because the scanned process's filedesc
512 * structure can be ripped out from under us, amoung other things.
515 checkdirs_callback(struct proc
*p
, void *data
)
517 struct checkdirs_info
*info
= data
;
518 struct filedesc
*fdp
;
519 struct nchandle ncdrop1
;
520 struct nchandle ncdrop2
;
521 struct vnode
*vprele1
;
522 struct vnode
*vprele2
;
524 if ((fdp
= p
->p_fd
) != NULL
) {
525 cache_zero(&ncdrop1
);
526 cache_zero(&ncdrop2
);
531 * MPUNSAFE - XXX fdp can be pulled out from under a
534 * A shared filedesc is ok, we don't have to copy it
535 * because we are making this change globally.
537 spin_lock(&fdp
->fd_spin
);
538 if (fdp
->fd_ncdir
.mount
== info
->old_nch
.mount
&&
539 fdp
->fd_ncdir
.ncp
== info
->old_nch
.ncp
) {
540 vprele1
= fdp
->fd_cdir
;
542 fdp
->fd_cdir
= info
->new_vp
;
543 ncdrop1
= fdp
->fd_ncdir
;
544 cache_copy(&info
->new_nch
, &fdp
->fd_ncdir
);
546 if (fdp
->fd_nrdir
.mount
== info
->old_nch
.mount
&&
547 fdp
->fd_nrdir
.ncp
== info
->old_nch
.ncp
) {
548 vprele2
= fdp
->fd_rdir
;
550 fdp
->fd_rdir
= info
->new_vp
;
551 ncdrop2
= fdp
->fd_nrdir
;
552 cache_copy(&info
->new_nch
, &fdp
->fd_nrdir
);
554 spin_unlock(&fdp
->fd_spin
);
556 cache_drop(&ncdrop1
);
558 cache_drop(&ncdrop2
);
568 * Unmount a file system.
570 * Note: unmount takes a path to the vnode mounted on as argument,
571 * not special file (as before).
573 * umount_args(char *path, int flags)
578 sys_unmount(struct unmount_args
*uap
)
580 struct thread
*td
= curthread
;
581 struct proc
*p __debugvar
= td
->td_proc
;
582 struct mount
*mp
= NULL
;
583 struct nlookupdata nd
;
588 if (td
->td_ucred
->cr_prison
!= NULL
) {
592 if (usermount
== 0 && (error
= priv_check(td
, PRIV_ROOT
)))
595 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
597 error
= nlookup(&nd
);
601 mp
= nd
.nl_nch
.mount
;
604 * Only root, or the user that did the original mount is
605 * permitted to unmount this filesystem.
607 if ((mp
->mnt_stat
.f_owner
!= td
->td_ucred
->cr_uid
) &&
608 (error
= priv_check(td
, PRIV_ROOT
)))
612 * Don't allow unmounting the root file system.
614 if (mp
->mnt_flag
& MNT_ROOTFS
) {
620 * Must be the root of the filesystem
622 if (nd
.nl_nch
.ncp
!= mp
->mnt_ncmountpt
.ncp
) {
630 error
= dounmount(mp
, uap
->flags
);
637 * Do the actual file system unmount.
640 dounmount_interlock(struct mount
*mp
)
642 if (mp
->mnt_kern_flag
& MNTK_UNMOUNT
)
644 mp
->mnt_kern_flag
|= MNTK_UNMOUNT
;
649 unmount_allproc_cb(struct proc
*p
, void *arg
)
653 if (p
->p_textnch
.ncp
== NULL
)
656 mp
= (struct mount
*)arg
;
657 if (p
->p_textnch
.mount
== mp
)
658 cache_drop(&p
->p_textnch
);
664 dounmount(struct mount
*mp
, int flags
)
666 struct namecache
*ncp
;
675 lwkt_gettoken(&mp
->mnt_token
);
677 * Exclusive access for unmounting purposes
679 if ((error
= mountlist_interlock(dounmount_interlock
, mp
)) != 0)
683 * Allow filesystems to detect that a forced unmount is in progress.
685 if (flags
& MNT_FORCE
)
686 mp
->mnt_kern_flag
|= MNTK_UNMOUNTF
;
687 lflags
= LK_EXCLUSIVE
| ((flags
& MNT_FORCE
) ? 0 : LK_TIMELOCK
);
688 error
= lockmgr(&mp
->mnt_lock
, lflags
);
690 mp
->mnt_kern_flag
&= ~(MNTK_UNMOUNT
| MNTK_UNMOUNTF
);
691 if (mp
->mnt_kern_flag
& MNTK_MWAIT
) {
692 mp
->mnt_kern_flag
&= ~MNTK_MWAIT
;
698 if (mp
->mnt_flag
& MNT_EXPUBLIC
)
699 vfs_setpublicfs(NULL
, NULL
, NULL
);
701 vfs_msync(mp
, MNT_WAIT
);
702 async_flag
= mp
->mnt_flag
& MNT_ASYNC
;
703 mp
->mnt_flag
&=~ MNT_ASYNC
;
706 * If this filesystem isn't aliasing other filesystems,
707 * try to invalidate any remaining namecache entries and
708 * check the count afterwords.
710 if ((mp
->mnt_kern_flag
& MNTK_NCALIASED
) == 0) {
711 cache_lock(&mp
->mnt_ncmountpt
);
712 cache_inval(&mp
->mnt_ncmountpt
, CINV_DESTROY
|CINV_CHILDREN
);
713 cache_unlock(&mp
->mnt_ncmountpt
);
715 if ((ncp
= mp
->mnt_ncmountpt
.ncp
) != NULL
&&
716 (ncp
->nc_refs
!= 1 || TAILQ_FIRST(&ncp
->nc_list
))) {
717 allproc_scan(&unmount_allproc_cb
, mp
);
720 if ((ncp
= mp
->mnt_ncmountpt
.ncp
) != NULL
&&
721 (ncp
->nc_refs
!= 1 || TAILQ_FIRST(&ncp
->nc_list
))) {
723 if ((flags
& MNT_FORCE
) == 0) {
725 mount_warning(mp
, "Cannot unmount: "
731 mount_warning(mp
, "Forced unmount: "
742 * Decomission our special mnt_syncer vnode. This also stops
743 * the vnlru code. If we are unable to unmount we recommission
746 * Then sync the filesystem.
748 if ((vp
= mp
->mnt_syncer
) != NULL
) {
749 mp
->mnt_syncer
= NULL
;
750 atomic_set_int(&vp
->v_refcnt
, VREF_FINALIZE
);
753 if ((mp
->mnt_flag
& MNT_RDONLY
) == 0)
754 VFS_SYNC(mp
, MNT_WAIT
);
757 * nchandle records ref the mount structure. Expect a count of 1
758 * (our mount->mnt_ncmountpt).
760 * Scans can get temporary refs on a mountpoint (thought really
761 * heavy duty stuff like cache_findmount() do not).
763 for (retry
= 0; retry
< 10 && mp
->mnt_refs
!= 1; ++retry
) {
764 cache_unmounting(mp
);
765 tsleep(&mp
->mnt_refs
, 0, "mntbsy", hz
/ 10 + 1);
767 if (mp
->mnt_refs
!= 1) {
768 if ((flags
& MNT_FORCE
) == 0) {
769 mount_warning(mp
, "Cannot unmount: "
770 "%d mount refs still present",
774 mount_warning(mp
, "Forced unmount: "
775 "%d mount refs still present",
782 * So far so good, sync the filesystem once more and
783 * call the VFS unmount code if the sync succeeds.
786 if (mp
->mnt_flag
& MNT_RDONLY
) {
787 error
= VFS_UNMOUNT(mp
, flags
);
789 error
= VFS_SYNC(mp
, MNT_WAIT
);
791 (error
== EOPNOTSUPP
) || /* No sync */
792 (flags
& MNT_FORCE
)) {
793 error
= VFS_UNMOUNT(mp
, flags
);
799 * If an error occurred we can still recover, restoring the
800 * syncer vnode and misc flags.
803 if (mp
->mnt_syncer
== NULL
)
804 vfs_allocate_syncvnode(mp
);
805 mp
->mnt_kern_flag
&= ~(MNTK_UNMOUNT
| MNTK_UNMOUNTF
);
806 mp
->mnt_flag
|= async_flag
;
807 lockmgr(&mp
->mnt_lock
, LK_RELEASE
);
808 if (mp
->mnt_kern_flag
& MNTK_MWAIT
) {
809 mp
->mnt_kern_flag
&= ~MNTK_MWAIT
;
815 * Clean up any journals still associated with the mount after
816 * filesystem activity has ceased.
818 journal_remove_all_journals(mp
,
819 ((flags
& MNT_FORCE
) ? MC_JOURNAL_STOP_IMM
: 0));
821 mountlist_remove(mp
);
824 * Remove any installed vnode ops here so the individual VFSs don't
827 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_coherency_ops
);
828 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_journal_ops
);
829 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_norm_ops
);
830 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_spec_ops
);
831 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_fifo_ops
);
833 if (mp
->mnt_ncmountpt
.ncp
!= NULL
) {
834 nch
= mp
->mnt_ncmountpt
;
835 cache_zero(&mp
->mnt_ncmountpt
);
836 cache_clrmountpt(&nch
);
839 if (mp
->mnt_ncmounton
.ncp
!= NULL
) {
840 cache_unmounting(mp
);
841 nch
= mp
->mnt_ncmounton
;
842 cache_zero(&mp
->mnt_ncmounton
);
843 cache_clrmountpt(&nch
);
847 mp
->mnt_vfc
->vfc_refcount
--;
848 if (!TAILQ_EMPTY(&mp
->mnt_nvnodelist
))
849 panic("unmount: dangling vnode");
850 lockmgr(&mp
->mnt_lock
, LK_RELEASE
);
851 if (mp
->mnt_kern_flag
& MNTK_MWAIT
) {
852 mp
->mnt_kern_flag
&= ~MNTK_MWAIT
;
857 * If we reach here and freeok != 0 we must free the mount.
858 * If refs > 1 cycle and wait, just in case someone tried
859 * to busy the mount after we decided to do the unmount.
862 while (mp
->mnt_refs
> 1) {
863 cache_unmounting(mp
);
865 tsleep(&mp
->mnt_refs
, 0, "umntrwait", hz
/ 10 + 1);
867 lwkt_reltoken(&mp
->mnt_token
);
872 KNOTE(&fs_klist
, VQ_UNMOUNT
);
875 lwkt_reltoken(&mp
->mnt_token
);
881 mount_warning(struct mount
*mp
, const char *ctl
, ...)
888 if (cache_fullpath(NULL
, &mp
->mnt_ncmounton
, NULL
,
889 &ptr
, &buf
, 0) == 0) {
890 kprintf("unmount(%s): ", ptr
);
895 kprintf("unmount(%p", mp
);
896 if (mp
->mnt_ncmounton
.ncp
&& mp
->mnt_ncmounton
.ncp
->nc_name
)
897 kprintf(",%s", mp
->mnt_ncmounton
.ncp
->nc_name
);
906 * Shim cache_fullpath() to handle the case where a process is chrooted into
907 * a subdirectory of a mount. In this case if the root mount matches the
908 * process root directory's mount we have to specify the process's root
909 * directory instead of the mount point, because the mount point might
910 * be above the root directory.
914 mount_path(struct proc
*p
, struct mount
*mp
, char **rb
, char **fb
)
916 struct nchandle
*nch
;
918 if (p
&& p
->p_fd
->fd_nrdir
.mount
== mp
)
919 nch
= &p
->p_fd
->fd_nrdir
;
921 nch
= &mp
->mnt_ncmountpt
;
922 return(cache_fullpath(p
, nch
, NULL
, rb
, fb
, 0));
926 * Sync each mounted filesystem.
930 static int syncprt
= 0;
931 SYSCTL_INT(_debug
, OID_AUTO
, syncprt
, CTLFLAG_RW
, &syncprt
, 0, "");
934 static int sync_callback(struct mount
*mp
, void *data
);
937 sys_sync(struct sync_args
*uap
)
939 mountlist_scan(sync_callback
, NULL
, MNTSCAN_FORWARD
);
945 sync_callback(struct mount
*mp
, void *data __unused
)
949 if ((mp
->mnt_flag
& MNT_RDONLY
) == 0) {
950 asyncflag
= mp
->mnt_flag
& MNT_ASYNC
;
951 mp
->mnt_flag
&= ~MNT_ASYNC
;
952 vfs_msync(mp
, MNT_NOWAIT
);
953 VFS_SYNC(mp
, MNT_NOWAIT
);
954 mp
->mnt_flag
|= asyncflag
;
959 /* XXX PRISON: could be per prison flag */
960 static int prison_quotas
;
962 SYSCTL_INT(_kern_prison
, OID_AUTO
, quotas
, CTLFLAG_RW
, &prison_quotas
, 0, "");
966 * quotactl_args(char *path, int fcmd, int uid, caddr_t arg)
968 * Change filesystem quotas.
973 sys_quotactl(struct quotactl_args
*uap
)
975 struct nlookupdata nd
;
982 if (td
->td_ucred
->cr_prison
&& !prison_quotas
) {
987 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
989 error
= nlookup(&nd
);
991 mp
= nd
.nl_nch
.mount
;
992 error
= VFS_QUOTACTL(mp
, uap
->cmd
, uap
->uid
,
993 uap
->arg
, nd
.nl_cred
);
1002 * mountctl(char *path, int op, int fd, const void *ctl, int ctllen,
1003 * void *buf, int buflen)
1005 * This function operates on a mount point and executes the specified
1006 * operation using the specified control data, and possibly returns data.
1008 * The actual number of bytes stored in the result buffer is returned, 0
1009 * if none, otherwise an error is returned.
1014 sys_mountctl(struct mountctl_args
*uap
)
1016 struct thread
*td
= curthread
;
1017 struct proc
*p
= td
->td_proc
;
1025 * Sanity and permissions checks. We must be root.
1028 if (td
->td_ucred
->cr_prison
!= NULL
)
1030 if ((uap
->op
!= MOUNTCTL_MOUNTFLAGS
) &&
1031 (error
= priv_check(td
, PRIV_ROOT
)) != 0)
1035 * Argument length checks
1037 if (uap
->ctllen
< 0 || uap
->ctllen
> 1024)
1039 if (uap
->buflen
< 0 || uap
->buflen
> 16 * 1024)
1041 if (uap
->path
== NULL
)
1045 * Allocate the necessary buffers and copyin data
1047 path
= objcache_get(namei_oc
, M_WAITOK
);
1048 error
= copyinstr(uap
->path
, path
, MAXPATHLEN
, NULL
);
1053 ctl
= kmalloc(uap
->ctllen
+ 1, M_TEMP
, M_WAITOK
|M_ZERO
);
1054 error
= copyin(uap
->ctl
, ctl
, uap
->ctllen
);
1059 buf
= kmalloc(uap
->buflen
+ 1, M_TEMP
, M_WAITOK
|M_ZERO
);
1062 * Validate the descriptor
1065 fp
= holdfp(p
->p_fd
, uap
->fd
, -1);
1075 * Execute the internal kernel function and clean up.
1078 error
= kern_mountctl(path
, uap
->op
, fp
, ctl
, uap
->ctllen
, buf
, uap
->buflen
, &uap
->sysmsg_result
);
1082 if (error
== 0 && uap
->sysmsg_result
> 0)
1083 error
= copyout(buf
, uap
->buf
, uap
->sysmsg_result
);
1086 objcache_put(namei_oc
, path
);
1095 * Execute a mount control operation by resolving the path to a mount point
1096 * and calling vop_mountctl().
1098 * Use the mount point from the nch instead of the vnode so nullfs mounts
1099 * can properly spike the VOP.
1102 kern_mountctl(const char *path
, int op
, struct file
*fp
,
1103 const void *ctl
, int ctllen
,
1104 void *buf
, int buflen
, int *res
)
1107 struct nlookupdata nd
;
1108 struct nchandle nch
;
1114 error
= nlookup_init(&nd
, path
, UIO_SYSSPACE
, NLC_FOLLOW
);
1117 error
= nlookup(&nd
);
1122 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_EXCLUSIVE
, &vp
);
1129 * Yes, all this is needed to use the nch.mount below, because
1130 * we must maintain a ref on the mount to avoid ripouts (e.g.
1131 * due to heavy mount/unmount use by synth or poudriere).
1134 cache_zero(&nd
.nl_nch
);
1142 * Must be the root of the filesystem
1144 if ((vp
->v_flag
& (VROOT
|VPFSROOT
)) == 0) {
1149 if (mp
== NULL
|| mp
->mnt_kern_flag
& MNTK_UNMOUNT
) {
1150 kprintf("kern_mountctl: Warning, \"%s\" racing unmount\n",
1156 error
= vop_mountctl(mp
->mnt_vn_use_ops
, vp
, op
, fp
, ctl
, ctllen
,
1165 kern_statfs(struct nlookupdata
*nd
, struct statfs
*buf
)
1167 struct thread
*td
= curthread
;
1168 struct proc
*p
= td
->td_proc
;
1171 char *fullpath
, *freepath
;
1174 if ((error
= nlookup(nd
)) != 0)
1176 mp
= nd
->nl_nch
.mount
;
1178 if ((error
= VFS_STATFS(mp
, sp
, nd
->nl_cred
)) != 0)
1181 error
= mount_path(p
, mp
, &fullpath
, &freepath
);
1184 bzero(sp
->f_mntonname
, sizeof(sp
->f_mntonname
));
1185 strlcpy(sp
->f_mntonname
, fullpath
, sizeof(sp
->f_mntonname
));
1186 kfree(freepath
, M_TEMP
);
1188 sp
->f_flags
= mp
->mnt_flag
& MNT_VISFLAGMASK
;
1189 bcopy(sp
, buf
, sizeof(*buf
));
1190 /* Only root should have access to the fsid's. */
1191 if (priv_check(td
, PRIV_ROOT
))
1192 buf
->f_fsid
.val
[0] = buf
->f_fsid
.val
[1] = 0;
1197 * statfs_args(char *path, struct statfs *buf)
1199 * Get filesystem statistics.
1202 sys_statfs(struct statfs_args
*uap
)
1204 struct nlookupdata nd
;
1208 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
1210 error
= kern_statfs(&nd
, &buf
);
1213 error
= copyout(&buf
, uap
->buf
, sizeof(*uap
->buf
));
1218 kern_fstatfs(int fd
, struct statfs
*buf
)
1220 struct thread
*td
= curthread
;
1221 struct proc
*p
= td
->td_proc
;
1225 char *fullpath
, *freepath
;
1229 if ((error
= holdvnode(p
->p_fd
, fd
, &fp
)) != 0)
1233 * Try to use mount info from any overlays rather than the
1234 * mount info for the underlying vnode, otherwise we will
1235 * fail when operating on null-mounted paths inside a chroot.
1237 if ((mp
= fp
->f_nchandle
.mount
) == NULL
)
1238 mp
= ((struct vnode
*)fp
->f_data
)->v_mount
;
1243 if (fp
->f_cred
== NULL
) {
1248 if ((error
= VFS_STATFS(mp
, sp
, fp
->f_cred
)) != 0)
1251 if ((error
= mount_path(p
, mp
, &fullpath
, &freepath
)) != 0)
1253 bzero(sp
->f_mntonname
, sizeof(sp
->f_mntonname
));
1254 strlcpy(sp
->f_mntonname
, fullpath
, sizeof(sp
->f_mntonname
));
1255 kfree(freepath
, M_TEMP
);
1257 sp
->f_flags
= mp
->mnt_flag
& MNT_VISFLAGMASK
;
1258 bcopy(sp
, buf
, sizeof(*buf
));
1260 /* Only root should have access to the fsid's. */
1261 if (priv_check(td
, PRIV_ROOT
))
1262 buf
->f_fsid
.val
[0] = buf
->f_fsid
.val
[1] = 0;
1270 * fstatfs_args(int fd, struct statfs *buf)
1272 * Get filesystem statistics.
1275 sys_fstatfs(struct fstatfs_args
*uap
)
1280 error
= kern_fstatfs(uap
->fd
, &buf
);
1283 error
= copyout(&buf
, uap
->buf
, sizeof(*uap
->buf
));
1288 kern_statvfs(struct nlookupdata
*nd
, struct statvfs
*buf
)
1294 if ((error
= nlookup(nd
)) != 0)
1296 mp
= nd
->nl_nch
.mount
;
1297 sp
= &mp
->mnt_vstat
;
1298 if ((error
= VFS_STATVFS(mp
, sp
, nd
->nl_cred
)) != 0)
1302 if (mp
->mnt_flag
& MNT_RDONLY
)
1303 sp
->f_flag
|= ST_RDONLY
;
1304 if (mp
->mnt_flag
& MNT_NOSUID
)
1305 sp
->f_flag
|= ST_NOSUID
;
1306 bcopy(sp
, buf
, sizeof(*buf
));
1311 * statfs_args(char *path, struct statfs *buf)
1313 * Get filesystem statistics.
1316 sys_statvfs(struct statvfs_args
*uap
)
1318 struct nlookupdata nd
;
1322 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
1324 error
= kern_statvfs(&nd
, &buf
);
1327 error
= copyout(&buf
, uap
->buf
, sizeof(*uap
->buf
));
1332 kern_fstatvfs(int fd
, struct statvfs
*buf
)
1334 struct thread
*td
= curthread
;
1335 struct proc
*p
= td
->td_proc
;
1342 if ((error
= holdvnode(p
->p_fd
, fd
, &fp
)) != 0)
1344 if ((mp
= fp
->f_nchandle
.mount
) == NULL
)
1345 mp
= ((struct vnode
*)fp
->f_data
)->v_mount
;
1350 if (fp
->f_cred
== NULL
) {
1354 sp
= &mp
->mnt_vstat
;
1355 if ((error
= VFS_STATVFS(mp
, sp
, fp
->f_cred
)) != 0)
1359 if (mp
->mnt_flag
& MNT_RDONLY
)
1360 sp
->f_flag
|= ST_RDONLY
;
1361 if (mp
->mnt_flag
& MNT_NOSUID
)
1362 sp
->f_flag
|= ST_NOSUID
;
1364 bcopy(sp
, buf
, sizeof(*buf
));
1372 * fstatfs_args(int fd, struct statfs *buf)
1374 * Get filesystem statistics.
1377 sys_fstatvfs(struct fstatvfs_args
*uap
)
1382 error
= kern_fstatvfs(uap
->fd
, &buf
);
1385 error
= copyout(&buf
, uap
->buf
, sizeof(*uap
->buf
));
1390 * getfsstat_args(struct statfs *buf, long bufsize, int flags)
1392 * Get statistics on all filesystems.
1395 struct getfsstat_info
{
1396 struct statfs
*sfsp
;
1404 static int getfsstat_callback(struct mount
*, void *);
1407 sys_getfsstat(struct getfsstat_args
*uap
)
1409 struct thread
*td
= curthread
;
1410 struct getfsstat_info info
;
1412 bzero(&info
, sizeof(info
));
1414 info
.maxcount
= uap
->bufsize
/ sizeof(struct statfs
);
1415 info
.sfsp
= uap
->buf
;
1417 info
.flags
= uap
->flags
;
1420 mountlist_scan(getfsstat_callback
, &info
, MNTSCAN_FORWARD
);
1421 if (info
.sfsp
&& info
.count
> info
.maxcount
)
1422 uap
->sysmsg_result
= info
.maxcount
;
1424 uap
->sysmsg_result
= info
.count
;
1425 return (info
.error
);
1429 getfsstat_callback(struct mount
*mp
, void *data
)
1431 struct getfsstat_info
*info
= data
;
1437 if (info
->sfsp
&& info
->count
< info
->maxcount
) {
1438 if (info
->td
->td_proc
&&
1439 !chroot_visible_mnt(mp
, info
->td
->td_proc
)) {
1445 * If MNT_NOWAIT or MNT_LAZY is specified, do not
1446 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
1447 * overrides MNT_WAIT.
1449 if (((info
->flags
& (MNT_LAZY
|MNT_NOWAIT
)) == 0 ||
1450 (info
->flags
& MNT_WAIT
)) &&
1451 (error
= VFS_STATFS(mp
, sp
, info
->td
->td_ucred
))) {
1454 sp
->f_flags
= mp
->mnt_flag
& MNT_VISFLAGMASK
;
1456 error
= mount_path(info
->td
->td_proc
, mp
, &fullpath
, &freepath
);
1458 info
->error
= error
;
1461 bzero(sp
->f_mntonname
, sizeof(sp
->f_mntonname
));
1462 strlcpy(sp
->f_mntonname
, fullpath
, sizeof(sp
->f_mntonname
));
1463 kfree(freepath
, M_TEMP
);
1465 error
= copyout(sp
, info
->sfsp
, sizeof(*sp
));
1467 info
->error
= error
;
1477 * getvfsstat_args(struct statfs *buf, struct statvfs *vbuf,
1478 long bufsize, int flags)
1480 * Get statistics on all filesystems.
1483 struct getvfsstat_info
{
1484 struct statfs
*sfsp
;
1485 struct statvfs
*vsfsp
;
1493 static int getvfsstat_callback(struct mount
*, void *);
1496 sys_getvfsstat(struct getvfsstat_args
*uap
)
1498 struct thread
*td
= curthread
;
1499 struct getvfsstat_info info
;
1501 bzero(&info
, sizeof(info
));
1503 info
.maxcount
= uap
->vbufsize
/ sizeof(struct statvfs
);
1504 info
.sfsp
= uap
->buf
;
1505 info
.vsfsp
= uap
->vbuf
;
1507 info
.flags
= uap
->flags
;
1510 mountlist_scan(getvfsstat_callback
, &info
, MNTSCAN_FORWARD
);
1511 if (info
.vsfsp
&& info
.count
> info
.maxcount
)
1512 uap
->sysmsg_result
= info
.maxcount
;
1514 uap
->sysmsg_result
= info
.count
;
1515 return (info
.error
);
1519 getvfsstat_callback(struct mount
*mp
, void *data
)
1521 struct getvfsstat_info
*info
= data
;
1523 struct statvfs
*vsp
;
1528 if (info
->vsfsp
&& info
->count
< info
->maxcount
) {
1529 if (info
->td
->td_proc
&&
1530 !chroot_visible_mnt(mp
, info
->td
->td_proc
)) {
1534 vsp
= &mp
->mnt_vstat
;
1537 * If MNT_NOWAIT or MNT_LAZY is specified, do not
1538 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
1539 * overrides MNT_WAIT.
1541 if (((info
->flags
& (MNT_LAZY
|MNT_NOWAIT
)) == 0 ||
1542 (info
->flags
& MNT_WAIT
)) &&
1543 (error
= VFS_STATFS(mp
, sp
, info
->td
->td_ucred
))) {
1546 sp
->f_flags
= mp
->mnt_flag
& MNT_VISFLAGMASK
;
1548 if (((info
->flags
& (MNT_LAZY
|MNT_NOWAIT
)) == 0 ||
1549 (info
->flags
& MNT_WAIT
)) &&
1550 (error
= VFS_STATVFS(mp
, vsp
, info
->td
->td_ucred
))) {
1554 if (mp
->mnt_flag
& MNT_RDONLY
)
1555 vsp
->f_flag
|= ST_RDONLY
;
1556 if (mp
->mnt_flag
& MNT_NOSUID
)
1557 vsp
->f_flag
|= ST_NOSUID
;
1559 error
= mount_path(info
->td
->td_proc
, mp
, &fullpath
, &freepath
);
1561 info
->error
= error
;
1564 bzero(sp
->f_mntonname
, sizeof(sp
->f_mntonname
));
1565 strlcpy(sp
->f_mntonname
, fullpath
, sizeof(sp
->f_mntonname
));
1566 kfree(freepath
, M_TEMP
);
1568 error
= copyout(sp
, info
->sfsp
, sizeof(*sp
));
1570 error
= copyout(vsp
, info
->vsfsp
, sizeof(*vsp
));
1572 info
->error
= error
;
1584 * fchdir_args(int fd)
1586 * Change current working directory to a given file descriptor.
1589 sys_fchdir(struct fchdir_args
*uap
)
1591 struct thread
*td
= curthread
;
1592 struct proc
*p
= td
->td_proc
;
1593 struct filedesc
*fdp
= p
->p_fd
;
1594 struct vnode
*vp
, *ovp
;
1597 struct nchandle nch
, onch
, tnch
;
1600 if ((error
= holdvnode(fdp
, uap
->fd
, &fp
)) != 0)
1602 lwkt_gettoken(&p
->p_token
);
1603 vp
= (struct vnode
*)fp
->f_data
;
1605 vn_lock(vp
, LK_SHARED
| LK_RETRY
);
1606 if (fp
->f_nchandle
.ncp
== NULL
)
1609 error
= checkvp_chdir(vp
, td
);
1614 cache_copy(&fp
->f_nchandle
, &nch
);
1617 * If the ncp has become a mount point, traverse through
1621 while (!error
&& (nch
.ncp
->nc_flag
& NCF_ISMOUNTPT
) &&
1622 (mp
= cache_findmount(&nch
)) != NULL
1624 error
= nlookup_mp(mp
, &tnch
);
1626 cache_unlock(&tnch
); /* leave ref intact */
1628 vp
= tnch
.ncp
->nc_vp
;
1629 error
= vget(vp
, LK_SHARED
);
1630 KKASSERT(error
== 0);
1634 cache_dropmount(mp
);
1638 onch
= fdp
->fd_ncdir
;
1639 vn_unlock(vp
); /* leave ref intact */
1641 fdp
->fd_ncdir
= nch
;
1650 lwkt_reltoken(&p
->p_token
);
1655 kern_chdir(struct nlookupdata
*nd
)
1657 struct thread
*td
= curthread
;
1658 struct proc
*p
= td
->td_proc
;
1659 struct filedesc
*fdp
= p
->p_fd
;
1660 struct vnode
*vp
, *ovp
;
1661 struct nchandle onch
;
1664 nd
->nl_flags
|= NLC_SHAREDLOCK
;
1665 if ((error
= nlookup(nd
)) != 0)
1667 if ((vp
= nd
->nl_nch
.ncp
->nc_vp
) == NULL
)
1669 if ((error
= vget(vp
, LK_SHARED
)) != 0)
1672 lwkt_gettoken(&p
->p_token
);
1673 error
= checkvp_chdir(vp
, td
);
1677 onch
= fdp
->fd_ncdir
;
1678 cache_unlock(&nd
->nl_nch
); /* leave reference intact */
1679 fdp
->fd_ncdir
= nd
->nl_nch
;
1683 cache_zero(&nd
->nl_nch
);
1687 lwkt_reltoken(&p
->p_token
);
1692 * chdir_args(char *path)
1694 * Change current working directory (``.'').
1697 sys_chdir(struct chdir_args
*uap
)
1699 struct nlookupdata nd
;
1702 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
1704 error
= kern_chdir(&nd
);
1710 * Helper function for raised chroot(2) security function: Refuse if
1711 * any filedescriptors are open directories.
1714 chroot_refuse_vdir_fds(struct filedesc
*fdp
)
1721 for (fd
= 0; fd
< fdp
->fd_nfiles
; fd
++) {
1722 if ((error
= holdvnode(fdp
, fd
, &fp
)) != 0)
1724 vp
= (struct vnode
*)fp
->f_data
;
1725 if (vp
->v_type
!= VDIR
) {
1736 * This sysctl determines if we will allow a process to chroot(2) if it
1737 * has a directory open:
1738 * 0: disallowed for all processes.
1739 * 1: allowed for processes that were not already chroot(2)'ed.
1740 * 2: allowed for all processes.
1743 static int chroot_allow_open_directories
= 1;
1745 SYSCTL_INT(_kern
, OID_AUTO
, chroot_allow_open_directories
, CTLFLAG_RW
,
1746 &chroot_allow_open_directories
, 0, "");
1749 * chroot to the specified namecache entry. We obtain the vp from the
1750 * namecache data. The passed ncp must be locked and referenced and will
1751 * remain locked and referenced on return.
1754 kern_chroot(struct nchandle
*nch
)
1756 struct thread
*td
= curthread
;
1757 struct proc
*p
= td
->td_proc
;
1758 struct filedesc
*fdp
= p
->p_fd
;
1763 * Only privileged user can chroot
1765 error
= priv_check_cred(td
->td_ucred
, PRIV_VFS_CHROOT
, 0);
1770 * Disallow open directory descriptors (fchdir() breakouts).
1772 if (chroot_allow_open_directories
== 0 ||
1773 (chroot_allow_open_directories
== 1 && fdp
->fd_rdir
!= rootvnode
)) {
1774 if ((error
= chroot_refuse_vdir_fds(fdp
)) != 0)
1777 if ((vp
= nch
->ncp
->nc_vp
) == NULL
)
1780 if ((error
= vget(vp
, LK_SHARED
)) != 0)
1784 * Check the validity of vp as a directory to change to and
1785 * associate it with rdir/jdir.
1787 error
= checkvp_chdir(vp
, td
);
1788 vn_unlock(vp
); /* leave reference intact */
1790 vrele(fdp
->fd_rdir
);
1791 fdp
->fd_rdir
= vp
; /* reference inherited by fd_rdir */
1792 cache_drop(&fdp
->fd_nrdir
);
1793 cache_copy(nch
, &fdp
->fd_nrdir
);
1794 if (fdp
->fd_jdir
== NULL
) {
1797 cache_copy(nch
, &fdp
->fd_njdir
);
1806 * chroot_args(char *path)
1808 * Change notion of root (``/'') directory.
1811 sys_chroot(struct chroot_args
*uap
)
1813 struct thread
*td __debugvar
= curthread
;
1814 struct nlookupdata nd
;
1817 KKASSERT(td
->td_proc
);
1818 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
1820 nd
.nl_flags
|= NLC_EXEC
;
1821 error
= nlookup(&nd
);
1823 error
= kern_chroot(&nd
.nl_nch
);
1830 sys_chroot_kernel(struct chroot_kernel_args
*uap
)
1832 struct thread
*td
= curthread
;
1833 struct nlookupdata nd
;
1834 struct nchandle
*nch
;
1838 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
1842 error
= nlookup(&nd
);
1848 error
= priv_check_cred(td
->td_ucred
, PRIV_VFS_CHROOT
, 0);
1852 if ((vp
= nch
->ncp
->nc_vp
) == NULL
) {
1857 if ((error
= cache_vref(nch
, nd
.nl_cred
, &vp
)) != 0)
1860 kprintf("chroot_kernel: set new rootnch/rootvnode to %s\n", uap
->path
);
1862 vfs_cache_setroot(vp
, cache_hold(nch
));
1872 * Common routine for chroot and chdir. Given a locked, referenced vnode,
1873 * determine whether it is legal to chdir to the vnode. The vnode's state
1874 * is not changed by this call.
1877 checkvp_chdir(struct vnode
*vp
, struct thread
*td
)
1881 if (vp
->v_type
!= VDIR
)
1884 error
= VOP_EACCESS(vp
, VEXEC
, td
->td_ucred
);
1889 kern_open(struct nlookupdata
*nd
, int oflags
, int mode
, int *res
)
1891 struct thread
*td
= curthread
;
1892 struct proc
*p
= td
->td_proc
;
1893 struct lwp
*lp
= td
->td_lwp
;
1894 struct filedesc
*fdp
= p
->p_fd
;
1899 int type
, indx
, error
= 0;
1902 if ((oflags
& O_ACCMODE
) == O_ACCMODE
)
1904 flags
= FFLAGS(oflags
);
1905 error
= falloc(lp
, &nfp
, NULL
);
1909 cmode
= ((mode
&~ fdp
->fd_cmask
) & ALLPERMS
) & ~S_ISTXT
;
1912 * XXX p_dupfd is a real mess. It allows a device to return a
1913 * file descriptor to be duplicated rather then doing the open
1919 * Call vn_open() to do the lookup and assign the vnode to the
1920 * file pointer. vn_open() does not change the ref count on fp
1921 * and the vnode, on success, will be inherited by the file pointer
1924 * Request a shared lock on the vnode if possible.
1926 nd
->nl_flags
|= NLC_LOCKVP
;
1927 if ((flags
& (O_CREAT
|O_TRUNC
)) == 0)
1928 nd
->nl_flags
|= NLC_SHAREDLOCK
;
1930 error
= vn_open(nd
, fp
, flags
, cmode
);
1935 * handle special fdopen() case. bleh. dupfdopen() is
1936 * responsible for dropping the old contents of ofiles[indx]
1939 * Note that fsetfd() will add a ref to fp which represents
1940 * the fd_files[] assignment. We must still drop our
1943 if ((error
== ENODEV
|| error
== ENXIO
) && lp
->lwp_dupfd
>= 0) {
1944 if (fdalloc(p
, 0, &indx
) == 0) {
1945 error
= dupfdopen(fdp
, indx
, lp
->lwp_dupfd
, flags
, error
);
1948 fdrop(fp
); /* our ref */
1951 fsetfd(fdp
, NULL
, indx
);
1954 fdrop(fp
); /* our ref */
1955 if (error
== ERESTART
)
1961 * ref the vnode for ourselves so it can't be ripped out from under
1962 * is. XXX need an ND flag to request that the vnode be returned
1965 * Reserve a file descriptor but do not assign it until the open
1968 vp
= (struct vnode
*)fp
->f_data
;
1970 if ((error
= fdalloc(p
, 0, &indx
)) != 0) {
1977 * If no error occurs the vp will have been assigned to the file
1982 if (flags
& (O_EXLOCK
| O_SHLOCK
)) {
1983 lf
.l_whence
= SEEK_SET
;
1986 if (flags
& O_EXLOCK
)
1987 lf
.l_type
= F_WRLCK
;
1989 lf
.l_type
= F_RDLCK
;
1990 if (flags
& FNONBLOCK
)
1995 if ((error
= VOP_ADVLOCK(vp
, (caddr_t
)fp
, F_SETLK
, &lf
, type
)) != 0) {
1997 * lock request failed. Clean up the reserved
2001 fsetfd(fdp
, NULL
, indx
);
2005 atomic_set_int(&fp
->f_flag
, FHASLOCK
); /* race ok */
2009 * Assert that all regular file vnodes were created with a object.
2011 KASSERT(vp
->v_type
!= VREG
|| vp
->v_object
!= NULL
,
2012 ("open: regular file has no backing object after vn_open"));
2018 * release our private reference, leaving the one associated with the
2019 * descriptor table intact.
2021 if (oflags
& O_CLOEXEC
)
2022 fdp
->fd_files
[indx
].fileflags
|= UF_EXCLOSE
;
2023 fsetfd(fdp
, fp
, indx
);
2030 * open_args(char *path, int flags, int mode)
2032 * Check permissions, allocate an open file structure,
2033 * and call the device open routine if any.
2036 sys_open(struct open_args
*uap
)
2038 struct nlookupdata nd
;
2041 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2043 error
= kern_open(&nd
, uap
->flags
,
2044 uap
->mode
, &uap
->sysmsg_result
);
2051 * openat_args(int fd, char *path, int flags, int mode)
2054 sys_openat(struct openat_args
*uap
)
2056 struct nlookupdata nd
;
2060 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
, UIO_USERSPACE
, 0);
2062 error
= kern_open(&nd
, uap
->flags
, uap
->mode
,
2063 &uap
->sysmsg_result
);
2065 nlookup_done_at(&nd
, fp
);
2070 kern_mknod(struct nlookupdata
*nd
, int mode
, int rmajor
, int rminor
)
2072 struct thread
*td
= curthread
;
2073 struct proc
*p
= td
->td_proc
;
2082 vattr
.va_mode
= (mode
& ALLPERMS
) &~ p
->p_fd
->fd_cmask
;
2083 vattr
.va_rmajor
= rmajor
;
2084 vattr
.va_rminor
= rminor
;
2086 switch (mode
& S_IFMT
) {
2087 case S_IFMT
: /* used by badsect to flag bad sectors */
2088 error
= priv_check_cred(td
->td_ucred
, PRIV_VFS_MKNOD_BAD
, 0);
2089 vattr
.va_type
= VBAD
;
2092 error
= priv_check(td
, PRIV_VFS_MKNOD_DEV
);
2093 vattr
.va_type
= VCHR
;
2096 error
= priv_check(td
, PRIV_VFS_MKNOD_DEV
);
2097 vattr
.va_type
= VBLK
;
2100 error
= priv_check_cred(td
->td_ucred
, PRIV_VFS_MKNOD_WHT
, 0);
2103 case S_IFDIR
: /* special directories support for HAMMER */
2104 error
= priv_check_cred(td
->td_ucred
, PRIV_VFS_MKNOD_DIR
, 0);
2105 vattr
.va_type
= VDIR
;
2116 nd
->nl_flags
|= NLC_CREATE
| NLC_REFDVP
;
2117 if ((error
= nlookup(nd
)) != 0)
2119 if (nd
->nl_nch
.ncp
->nc_vp
)
2121 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
2125 error
= VOP_NWHITEOUT(&nd
->nl_nch
, nd
->nl_dvp
,
2126 nd
->nl_cred
, NAMEI_CREATE
);
2129 error
= VOP_NMKNOD(&nd
->nl_nch
, nd
->nl_dvp
,
2130 &vp
, nd
->nl_cred
, &vattr
);
2138 * mknod_args(char *path, int mode, int dev)
2140 * Create a special file.
2143 sys_mknod(struct mknod_args
*uap
)
2145 struct nlookupdata nd
;
2148 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2150 error
= kern_mknod(&nd
, uap
->mode
,
2151 umajor(uap
->dev
), uminor(uap
->dev
));
2158 * mknodat_args(int fd, char *path, mode_t mode, dev_t dev)
2160 * Create a special file. The path is relative to the directory associated
2164 sys_mknodat(struct mknodat_args
*uap
)
2166 struct nlookupdata nd
;
2170 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
, UIO_USERSPACE
, 0);
2172 error
= kern_mknod(&nd
, uap
->mode
,
2173 umajor(uap
->dev
), uminor(uap
->dev
));
2175 nlookup_done_at(&nd
, fp
);
2180 kern_mkfifo(struct nlookupdata
*nd
, int mode
)
2182 struct thread
*td
= curthread
;
2183 struct proc
*p
= td
->td_proc
;
2190 nd
->nl_flags
|= NLC_CREATE
| NLC_REFDVP
;
2191 if ((error
= nlookup(nd
)) != 0)
2193 if (nd
->nl_nch
.ncp
->nc_vp
)
2195 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
2199 vattr
.va_type
= VFIFO
;
2200 vattr
.va_mode
= (mode
& ALLPERMS
) &~ p
->p_fd
->fd_cmask
;
2202 error
= VOP_NMKNOD(&nd
->nl_nch
, nd
->nl_dvp
, &vp
, nd
->nl_cred
, &vattr
);
2209 * mkfifo_args(char *path, int mode)
2211 * Create a named pipe.
2214 sys_mkfifo(struct mkfifo_args
*uap
)
2216 struct nlookupdata nd
;
2219 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2221 error
= kern_mkfifo(&nd
, uap
->mode
);
2227 * mkfifoat_args(int fd, char *path, mode_t mode)
2229 * Create a named pipe. The path is relative to the directory associated
2233 sys_mkfifoat(struct mkfifoat_args
*uap
)
2235 struct nlookupdata nd
;
2239 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
, UIO_USERSPACE
, 0);
2241 error
= kern_mkfifo(&nd
, uap
->mode
);
2242 nlookup_done_at(&nd
, fp
);
2246 static int hardlink_check_uid
= 0;
2247 SYSCTL_INT(_security
, OID_AUTO
, hardlink_check_uid
, CTLFLAG_RW
,
2248 &hardlink_check_uid
, 0,
2249 "Unprivileged processes cannot create hard links to files owned by other "
2251 static int hardlink_check_gid
= 0;
2252 SYSCTL_INT(_security
, OID_AUTO
, hardlink_check_gid
, CTLFLAG_RW
,
2253 &hardlink_check_gid
, 0,
2254 "Unprivileged processes cannot create hard links to files owned by other "
2258 can_hardlink(struct vnode
*vp
, struct thread
*td
, struct ucred
*cred
)
2264 * Shortcut if disabled
2266 if (hardlink_check_uid
== 0 && hardlink_check_gid
== 0)
2270 * Privileged user can always hardlink
2272 if (priv_check_cred(cred
, PRIV_VFS_LINK
, 0) == 0)
2276 * Otherwise only if the originating file is owned by the
2277 * same user or group. Note that any group is allowed if
2278 * the file is owned by the caller.
2280 error
= VOP_GETATTR(vp
, &va
);
2284 if (hardlink_check_uid
) {
2285 if (cred
->cr_uid
!= va
.va_uid
)
2289 if (hardlink_check_gid
) {
2290 if (cred
->cr_uid
!= va
.va_uid
&& !groupmember(va
.va_gid
, cred
))
2298 kern_link(struct nlookupdata
*nd
, struct nlookupdata
*linknd
)
2300 struct thread
*td
= curthread
;
2305 * Lookup the source and obtained a locked vnode.
2307 * You may only hardlink a file which you have write permission
2308 * on or which you own.
2310 * XXX relookup on vget failure / race ?
2313 nd
->nl_flags
|= NLC_WRITE
| NLC_OWN
| NLC_HLINK
;
2314 if ((error
= nlookup(nd
)) != 0)
2316 vp
= nd
->nl_nch
.ncp
->nc_vp
;
2317 KKASSERT(vp
!= NULL
);
2318 if (vp
->v_type
== VDIR
)
2319 return (EPERM
); /* POSIX */
2320 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
2322 if ((error
= vget(vp
, LK_EXCLUSIVE
)) != 0)
2326 * Unlock the source so we can lookup the target without deadlocking
2327 * (XXX vp is locked already, possible other deadlock?). The target
2330 KKASSERT(nd
->nl_flags
& NLC_NCPISLOCKED
);
2331 nd
->nl_flags
&= ~NLC_NCPISLOCKED
;
2332 cache_unlock(&nd
->nl_nch
);
2335 linknd
->nl_flags
|= NLC_CREATE
| NLC_REFDVP
;
2336 if ((error
= nlookup(linknd
)) != 0) {
2340 if (linknd
->nl_nch
.ncp
->nc_vp
) {
2344 error
= vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
| LK_FAILRECLAIM
);
2351 * Finally run the new API VOP.
2353 error
= can_hardlink(vp
, td
, td
->td_ucred
);
2355 error
= VOP_NLINK(&linknd
->nl_nch
, linknd
->nl_dvp
,
2356 vp
, linknd
->nl_cred
);
2363 * link_args(char *path, char *link)
2365 * Make a hard file link.
2368 sys_link(struct link_args
*uap
)
2370 struct nlookupdata nd
, linknd
;
2373 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
2375 error
= nlookup_init(&linknd
, uap
->link
, UIO_USERSPACE
, 0);
2377 error
= kern_link(&nd
, &linknd
);
2378 nlookup_done(&linknd
);
2385 * linkat_args(int fd1, char *path1, int fd2, char *path2, int flags)
2387 * Make a hard file link. The path1 argument is relative to the directory
2388 * associated with fd1, and similarly the path2 argument is relative to
2389 * the directory associated with fd2.
2392 sys_linkat(struct linkat_args
*uap
)
2394 struct nlookupdata nd
, linknd
;
2395 struct file
*fp1
, *fp2
;
2398 error
= nlookup_init_at(&nd
, &fp1
, uap
->fd1
, uap
->path1
, UIO_USERSPACE
,
2399 (uap
->flags
& AT_SYMLINK_FOLLOW
) ? NLC_FOLLOW
: 0);
2401 error
= nlookup_init_at(&linknd
, &fp2
, uap
->fd2
,
2402 uap
->path2
, UIO_USERSPACE
, 0);
2404 error
= kern_link(&nd
, &linknd
);
2405 nlookup_done_at(&linknd
, fp2
);
2407 nlookup_done_at(&nd
, fp1
);
2412 kern_symlink(struct nlookupdata
*nd
, char *path
, int mode
)
2420 nd
->nl_flags
|= NLC_CREATE
| NLC_REFDVP
;
2421 if ((error
= nlookup(nd
)) != 0)
2423 if (nd
->nl_nch
.ncp
->nc_vp
)
2425 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
2429 vattr
.va_mode
= mode
;
2430 error
= VOP_NSYMLINK(&nd
->nl_nch
, dvp
, &vp
, nd
->nl_cred
, &vattr
, path
);
2437 * symlink(char *path, char *link)
2439 * Make a symbolic link.
2442 sys_symlink(struct symlink_args
*uap
)
2444 struct thread
*td
= curthread
;
2445 struct nlookupdata nd
;
2450 path
= objcache_get(namei_oc
, M_WAITOK
);
2451 error
= copyinstr(uap
->path
, path
, MAXPATHLEN
, NULL
);
2453 error
= nlookup_init(&nd
, uap
->link
, UIO_USERSPACE
, 0);
2455 mode
= ACCESSPERMS
& ~td
->td_proc
->p_fd
->fd_cmask
;
2456 error
= kern_symlink(&nd
, path
, mode
);
2460 objcache_put(namei_oc
, path
);
2465 * symlinkat_args(char *path1, int fd, char *path2)
2467 * Make a symbolic link. The path2 argument is relative to the directory
2468 * associated with fd.
2471 sys_symlinkat(struct symlinkat_args
*uap
)
2473 struct thread
*td
= curthread
;
2474 struct nlookupdata nd
;
2480 path1
= objcache_get(namei_oc
, M_WAITOK
);
2481 error
= copyinstr(uap
->path1
, path1
, MAXPATHLEN
, NULL
);
2483 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path2
,
2486 mode
= ACCESSPERMS
& ~td
->td_proc
->p_fd
->fd_cmask
;
2487 error
= kern_symlink(&nd
, path1
, mode
);
2489 nlookup_done_at(&nd
, fp
);
2491 objcache_put(namei_oc
, path1
);
2496 * undelete_args(char *path)
2498 * Delete a whiteout from the filesystem.
2501 sys_undelete(struct undelete_args
*uap
)
2503 struct nlookupdata nd
;
2506 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2508 nd
.nl_flags
|= NLC_DELETE
| NLC_REFDVP
;
2510 error
= nlookup(&nd
);
2512 error
= ncp_writechk(&nd
.nl_nch
);
2514 error
= VOP_NWHITEOUT(&nd
.nl_nch
, nd
.nl_dvp
, nd
.nl_cred
,
2522 kern_unlink(struct nlookupdata
*nd
)
2527 nd
->nl_flags
|= NLC_DELETE
| NLC_REFDVP
;
2528 if ((error
= nlookup(nd
)) != 0)
2530 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
2532 error
= VOP_NREMOVE(&nd
->nl_nch
, nd
->nl_dvp
, nd
->nl_cred
);
2537 * unlink_args(char *path)
2539 * Delete a name from the filesystem.
2542 sys_unlink(struct unlink_args
*uap
)
2544 struct nlookupdata nd
;
2547 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2549 error
= kern_unlink(&nd
);
2556 * unlinkat_args(int fd, char *path, int flags)
2558 * Delete the file or directory entry pointed to by fd/path.
2561 sys_unlinkat(struct unlinkat_args
*uap
)
2563 struct nlookupdata nd
;
2567 if (uap
->flags
& ~AT_REMOVEDIR
)
2570 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
, UIO_USERSPACE
, 0);
2572 if (uap
->flags
& AT_REMOVEDIR
)
2573 error
= kern_rmdir(&nd
);
2575 error
= kern_unlink(&nd
);
2577 nlookup_done_at(&nd
, fp
);
2582 kern_lseek(int fd
, off_t offset
, int whence
, off_t
*res
)
2584 struct thread
*td
= curthread
;
2585 struct proc
*p
= td
->td_proc
;
2592 fp
= holdfp(p
->p_fd
, fd
, -1);
2595 if (fp
->f_type
!= DTYPE_VNODE
) {
2599 vp
= (struct vnode
*)fp
->f_data
;
2603 spin_lock(&fp
->f_spin
);
2604 new_offset
= fp
->f_offset
+ offset
;
2608 error
= VOP_GETATTR(vp
, &vattr
);
2609 spin_lock(&fp
->f_spin
);
2610 new_offset
= offset
+ vattr
.va_size
;
2613 new_offset
= offset
;
2615 spin_lock(&fp
->f_spin
);
2620 spin_lock(&fp
->f_spin
);
2625 * Validate the seek position. Negative offsets are not allowed
2626 * for regular files or directories.
2628 * Normally we would also not want to allow negative offsets for
2629 * character and block-special devices. However kvm addresses
2630 * on 64 bit architectures might appear to be negative and must
2634 if (new_offset
< 0 &&
2635 (vp
->v_type
== VREG
|| vp
->v_type
== VDIR
)) {
2638 fp
->f_offset
= new_offset
;
2641 *res
= fp
->f_offset
;
2642 spin_unlock(&fp
->f_spin
);
2649 * lseek_args(int fd, int pad, off_t offset, int whence)
2651 * Reposition read/write file offset.
2654 sys_lseek(struct lseek_args
*uap
)
2658 error
= kern_lseek(uap
->fd
, uap
->offset
, uap
->whence
,
2659 &uap
->sysmsg_offset
);
2665 * Check if current process can access given file. amode is a bitmask of *_OK
2666 * access bits. flags is a bitmask of AT_* flags.
2669 kern_access(struct nlookupdata
*nd
, int amode
, int flags
)
2674 if (flags
& ~AT_EACCESS
)
2676 nd
->nl_flags
|= NLC_SHAREDLOCK
;
2677 if ((error
= nlookup(nd
)) != 0)
2680 error
= cache_vget(&nd
->nl_nch
, nd
->nl_cred
, LK_SHARED
, &vp
);
2684 /* Flags == 0 means only check for existence. */
2693 if ((mode
& VWRITE
) == 0 ||
2694 (error
= vn_writechk(vp
, &nd
->nl_nch
)) == 0)
2695 error
= VOP_ACCESS_FLAGS(vp
, mode
, flags
, nd
->nl_cred
);
2698 * If the file handle is stale we have to re-resolve the
2699 * entry with the ncp held exclusively. This is a hack
2702 if (error
== ESTALE
) {
2704 cache_unlock(&nd
->nl_nch
);
2705 cache_lock(&nd
->nl_nch
);
2706 cache_setunresolved(&nd
->nl_nch
);
2707 error
= cache_resolve(&nd
->nl_nch
, nd
->nl_cred
);
2720 * access_args(char *path, int flags)
2722 * Check access permissions.
2725 sys_access(struct access_args
*uap
)
2727 struct nlookupdata nd
;
2730 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
2732 error
= kern_access(&nd
, uap
->flags
, 0);
2739 * eaccess_args(char *path, int flags)
2741 * Check access permissions.
2744 sys_eaccess(struct eaccess_args
*uap
)
2746 struct nlookupdata nd
;
2749 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
2751 error
= kern_access(&nd
, uap
->flags
, AT_EACCESS
);
2758 * faccessat_args(int fd, char *path, int amode, int flags)
2760 * Check access permissions.
2763 sys_faccessat(struct faccessat_args
*uap
)
2765 struct nlookupdata nd
;
2769 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
, UIO_USERSPACE
,
2772 error
= kern_access(&nd
, uap
->amode
, uap
->flags
);
2773 nlookup_done_at(&nd
, fp
);
2778 kern_stat(struct nlookupdata
*nd
, struct stat
*st
)
2783 nd
->nl_flags
|= NLC_SHAREDLOCK
;
2784 if ((error
= nlookup(nd
)) != 0)
2787 if ((vp
= nd
->nl_nch
.ncp
->nc_vp
) == NULL
)
2790 if ((error
= vget(vp
, LK_SHARED
)) != 0)
2792 error
= vn_stat(vp
, st
, nd
->nl_cred
);
2795 * If the file handle is stale we have to re-resolve the
2796 * entry with the ncp held exclusively. This is a hack
2799 if (error
== ESTALE
) {
2801 cache_unlock(&nd
->nl_nch
);
2802 cache_lock(&nd
->nl_nch
);
2803 cache_setunresolved(&nd
->nl_nch
);
2804 error
= cache_resolve(&nd
->nl_nch
, nd
->nl_cred
);
2814 * stat_args(char *path, struct stat *ub)
2816 * Get file status; this version follows links.
2819 sys_stat(struct stat_args
*uap
)
2821 struct nlookupdata nd
;
2825 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
2827 error
= kern_stat(&nd
, &st
);
2829 error
= copyout(&st
, uap
->ub
, sizeof(*uap
->ub
));
2836 * lstat_args(char *path, struct stat *ub)
2838 * Get file status; this version does not follow links.
2841 sys_lstat(struct lstat_args
*uap
)
2843 struct nlookupdata nd
;
2847 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2849 error
= kern_stat(&nd
, &st
);
2851 error
= copyout(&st
, uap
->ub
, sizeof(*uap
->ub
));
2858 * fstatat_args(int fd, char *path, struct stat *sb, int flags)
2860 * Get status of file pointed to by fd/path.
2863 sys_fstatat(struct fstatat_args
*uap
)
2865 struct nlookupdata nd
;
2871 if (uap
->flags
& ~AT_SYMLINK_NOFOLLOW
)
2874 flags
= (uap
->flags
& AT_SYMLINK_NOFOLLOW
) ? 0 : NLC_FOLLOW
;
2876 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
,
2877 UIO_USERSPACE
, flags
);
2879 error
= kern_stat(&nd
, &st
);
2881 error
= copyout(&st
, uap
->sb
, sizeof(*uap
->sb
));
2883 nlookup_done_at(&nd
, fp
);
2888 kern_pathconf(char *path
, int name
, int flags
, register_t
*sysmsg_regp
)
2890 struct nlookupdata nd
;
2895 error
= nlookup_init(&nd
, path
, UIO_USERSPACE
, flags
);
2897 error
= nlookup(&nd
);
2899 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_EXCLUSIVE
, &vp
);
2902 error
= VOP_PATHCONF(vp
, name
, sysmsg_regp
);
2909 * pathconf_Args(char *path, int name)
2911 * Get configurable pathname variables.
2914 sys_pathconf(struct pathconf_args
*uap
)
2916 return (kern_pathconf(uap
->path
, uap
->name
, NLC_FOLLOW
,
2921 * lpathconf_Args(char *path, int name)
2923 * Get configurable pathname variables, but don't follow symlinks.
2926 sys_lpathconf(struct lpathconf_args
*uap
)
2928 return (kern_pathconf(uap
->path
, uap
->name
, 0, &uap
->sysmsg_reg
));
2933 * kern_readlink isn't properly split yet. There is a copyin burried
2934 * in VOP_READLINK().
2937 kern_readlink(struct nlookupdata
*nd
, char *buf
, int count
, int *res
)
2939 struct thread
*td
= curthread
;
2945 nd
->nl_flags
|= NLC_SHAREDLOCK
;
2946 if ((error
= nlookup(nd
)) != 0)
2948 error
= cache_vget(&nd
->nl_nch
, nd
->nl_cred
, LK_SHARED
, &vp
);
2951 if (vp
->v_type
!= VLNK
) {
2954 aiov
.iov_base
= buf
;
2955 aiov
.iov_len
= count
;
2956 auio
.uio_iov
= &aiov
;
2957 auio
.uio_iovcnt
= 1;
2958 auio
.uio_offset
= 0;
2959 auio
.uio_rw
= UIO_READ
;
2960 auio
.uio_segflg
= UIO_USERSPACE
;
2962 auio
.uio_resid
= count
;
2963 error
= VOP_READLINK(vp
, &auio
, td
->td_ucred
);
2966 *res
= count
- auio
.uio_resid
;
2971 * readlink_args(char *path, char *buf, int count)
2973 * Return target name of a symbolic link.
2976 sys_readlink(struct readlink_args
*uap
)
2978 struct nlookupdata nd
;
2981 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2983 error
= kern_readlink(&nd
, uap
->buf
, uap
->count
,
2984 &uap
->sysmsg_result
);
2991 * readlinkat_args(int fd, char *path, char *buf, size_t bufsize)
2993 * Return target name of a symbolic link. The path is relative to the
2994 * directory associated with fd.
2997 sys_readlinkat(struct readlinkat_args
*uap
)
2999 struct nlookupdata nd
;
3003 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
, UIO_USERSPACE
, 0);
3005 error
= kern_readlink(&nd
, uap
->buf
, uap
->bufsize
,
3006 &uap
->sysmsg_result
);
3008 nlookup_done_at(&nd
, fp
);
3013 setfflags(struct vnode
*vp
, int flags
)
3015 struct thread
*td
= curthread
;
3020 * Prevent non-root users from setting flags on devices. When
3021 * a device is reused, users can retain ownership of the device
3022 * if they are allowed to set flags and programs assume that
3023 * chown can't fail when done as root.
3025 if ((vp
->v_type
== VCHR
|| vp
->v_type
== VBLK
) &&
3026 ((error
= priv_check_cred(td
->td_ucred
, PRIV_VFS_CHFLAGS_DEV
, 0)) != 0))
3030 * note: vget is required for any operation that might mod the vnode
3031 * so VINACTIVE is properly cleared.
3033 if ((error
= vget(vp
, LK_EXCLUSIVE
)) == 0) {
3035 vattr
.va_flags
= flags
;
3036 error
= VOP_SETATTR(vp
, &vattr
, td
->td_ucred
);
3043 * chflags(char *path, int flags)
3045 * Change flags of a file given a path name.
3048 sys_chflags(struct chflags_args
*uap
)
3050 struct nlookupdata nd
;
3055 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
3057 error
= nlookup(&nd
);
3059 error
= ncp_writechk(&nd
.nl_nch
);
3061 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
3064 error
= setfflags(vp
, uap
->flags
);
3071 * lchflags(char *path, int flags)
3073 * Change flags of a file given a path name, but don't follow symlinks.
3076 sys_lchflags(struct lchflags_args
*uap
)
3078 struct nlookupdata nd
;
3083 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
3085 error
= nlookup(&nd
);
3087 error
= ncp_writechk(&nd
.nl_nch
);
3089 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
3092 error
= setfflags(vp
, uap
->flags
);
3099 * fchflags_args(int fd, int flags)
3101 * Change flags of a file given a file descriptor.
3104 sys_fchflags(struct fchflags_args
*uap
)
3106 struct thread
*td
= curthread
;
3107 struct proc
*p
= td
->td_proc
;
3111 if ((error
= holdvnode(p
->p_fd
, uap
->fd
, &fp
)) != 0)
3113 if (fp
->f_nchandle
.ncp
)
3114 error
= ncp_writechk(&fp
->f_nchandle
);
3116 error
= setfflags((struct vnode
*) fp
->f_data
, uap
->flags
);
3122 * chflagsat_args(int fd, const char *path, int flags, int atflags)
3123 * change flags given a pathname relative to a filedescriptor
3125 int sys_chflagsat(struct chflagsat_args
*uap
)
3127 struct nlookupdata nd
;
3133 if (uap
->atflags
& ~AT_SYMLINK_NOFOLLOW
)
3136 lookupflags
= (uap
->atflags
& AT_SYMLINK_NOFOLLOW
) ? 0 : NLC_FOLLOW
;
3139 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
, UIO_USERSPACE
, lookupflags
);
3141 error
= nlookup(&nd
);
3143 error
= ncp_writechk(&nd
.nl_nch
);
3145 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
3146 nlookup_done_at(&nd
, fp
);
3148 error
= setfflags(vp
, uap
->flags
);
3156 setfmode(struct vnode
*vp
, int mode
)
3158 struct thread
*td
= curthread
;
3163 * note: vget is required for any operation that might mod the vnode
3164 * so VINACTIVE is properly cleared.
3166 if ((error
= vget(vp
, LK_EXCLUSIVE
)) == 0) {
3168 vattr
.va_mode
= mode
& ALLPERMS
;
3169 error
= VOP_SETATTR(vp
, &vattr
, td
->td_ucred
);
3176 kern_chmod(struct nlookupdata
*nd
, int mode
)
3181 if ((error
= nlookup(nd
)) != 0)
3183 if ((error
= cache_vref(&nd
->nl_nch
, nd
->nl_cred
, &vp
)) != 0)
3185 if ((error
= ncp_writechk(&nd
->nl_nch
)) == 0)
3186 error
= setfmode(vp
, mode
);
3192 * chmod_args(char *path, int mode)
3194 * Change mode of a file given path name.
3197 sys_chmod(struct chmod_args
*uap
)
3199 struct nlookupdata nd
;
3202 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
3204 error
= kern_chmod(&nd
, uap
->mode
);
3210 * lchmod_args(char *path, int mode)
3212 * Change mode of a file given path name (don't follow links.)
3215 sys_lchmod(struct lchmod_args
*uap
)
3217 struct nlookupdata nd
;
3220 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
3222 error
= kern_chmod(&nd
, uap
->mode
);
3228 * fchmod_args(int fd, int mode)
3230 * Change mode of a file given a file descriptor.
3233 sys_fchmod(struct fchmod_args
*uap
)
3235 struct thread
*td
= curthread
;
3236 struct proc
*p
= td
->td_proc
;
3240 if ((error
= holdvnode(p
->p_fd
, uap
->fd
, &fp
)) != 0)
3242 if (fp
->f_nchandle
.ncp
)
3243 error
= ncp_writechk(&fp
->f_nchandle
);
3245 error
= setfmode((struct vnode
*)fp
->f_data
, uap
->mode
);
3251 * fchmodat_args(char *path, int mode)
3253 * Change mode of a file pointed to by fd/path.
3256 sys_fchmodat(struct fchmodat_args
*uap
)
3258 struct nlookupdata nd
;
3263 if (uap
->flags
& ~AT_SYMLINK_NOFOLLOW
)
3265 flags
= (uap
->flags
& AT_SYMLINK_NOFOLLOW
) ? 0 : NLC_FOLLOW
;
3267 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
,
3268 UIO_USERSPACE
, flags
);
3270 error
= kern_chmod(&nd
, uap
->mode
);
3271 nlookup_done_at(&nd
, fp
);
3276 setfown(struct mount
*mp
, struct vnode
*vp
, uid_t uid
, gid_t gid
)
3278 struct thread
*td
= curthread
;
3286 * note: vget is required for any operation that might mod the vnode
3287 * so VINACTIVE is properly cleared.
3289 if ((error
= vget(vp
, LK_EXCLUSIVE
)) == 0) {
3290 if ((error
= VOP_GETATTR(vp
, &vattr
)) != 0)
3292 o_uid
= vattr
.va_uid
;
3293 o_gid
= vattr
.va_gid
;
3294 size
= vattr
.va_size
;
3299 error
= VOP_SETATTR(vp
, &vattr
, td
->td_ucred
);
3308 VFS_ACCOUNT(mp
, o_uid
, o_gid
, -size
);
3309 VFS_ACCOUNT(mp
, uid
, gid
, size
);
3316 kern_chown(struct nlookupdata
*nd
, int uid
, int gid
)
3321 if ((error
= nlookup(nd
)) != 0)
3323 if ((error
= cache_vref(&nd
->nl_nch
, nd
->nl_cred
, &vp
)) != 0)
3325 if ((error
= ncp_writechk(&nd
->nl_nch
)) == 0)
3326 error
= setfown(nd
->nl_nch
.mount
, vp
, uid
, gid
);
3332 * chown(char *path, int uid, int gid)
3334 * Set ownership given a path name.
3337 sys_chown(struct chown_args
*uap
)
3339 struct nlookupdata nd
;
3342 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
3344 error
= kern_chown(&nd
, uap
->uid
, uap
->gid
);
3350 * lchown_args(char *path, int uid, int gid)
3352 * Set ownership given a path name, do not cross symlinks.
3355 sys_lchown(struct lchown_args
*uap
)
3357 struct nlookupdata nd
;
3360 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
3362 error
= kern_chown(&nd
, uap
->uid
, uap
->gid
);
3368 * fchown_args(int fd, int uid, int gid)
3370 * Set ownership given a file descriptor.
3373 sys_fchown(struct fchown_args
*uap
)
3375 struct thread
*td
= curthread
;
3376 struct proc
*p
= td
->td_proc
;
3380 if ((error
= holdvnode(p
->p_fd
, uap
->fd
, &fp
)) != 0)
3382 if (fp
->f_nchandle
.ncp
)
3383 error
= ncp_writechk(&fp
->f_nchandle
);
3385 error
= setfown(p
->p_fd
->fd_ncdir
.mount
,
3386 (struct vnode
*)fp
->f_data
, uap
->uid
, uap
->gid
);
3392 * fchownat(int fd, char *path, int uid, int gid, int flags)
3394 * Set ownership of file pointed to by fd/path.
3397 sys_fchownat(struct fchownat_args
*uap
)
3399 struct nlookupdata nd
;
3404 if (uap
->flags
& ~AT_SYMLINK_NOFOLLOW
)
3406 flags
= (uap
->flags
& AT_SYMLINK_NOFOLLOW
) ? 0 : NLC_FOLLOW
;
3408 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
,
3409 UIO_USERSPACE
, flags
);
3411 error
= kern_chown(&nd
, uap
->uid
, uap
->gid
);
3412 nlookup_done_at(&nd
, fp
);
3418 getutimes(struct timeval
*tvp
, struct timespec
*tsp
)
3420 struct timeval tv
[2];
3425 TIMEVAL_TO_TIMESPEC(&tv
[0], &tsp
[0]);
3428 if ((error
= itimerfix(tvp
)) != 0)
3430 TIMEVAL_TO_TIMESPEC(&tvp
[0], &tsp
[0]);
3431 TIMEVAL_TO_TIMESPEC(&tvp
[1], &tsp
[1]);
3437 getutimens(const struct timespec
*ts
, struct timespec
*newts
, int *nullflag
)
3439 struct timespec tsnow
;
3453 if (newts
[0].tv_nsec
== UTIME_OMIT
&& newts
[1].tv_nsec
== UTIME_OMIT
)
3455 if (newts
[0].tv_nsec
== UTIME_NOW
&& newts
[1].tv_nsec
== UTIME_NOW
)
3458 if (newts
[0].tv_nsec
== UTIME_OMIT
)
3459 newts
[0].tv_sec
= VNOVAL
;
3460 else if (newts
[0].tv_nsec
== UTIME_NOW
)
3462 else if ((error
= itimespecfix(&newts
[0])) != 0)
3465 if (newts
[1].tv_nsec
== UTIME_OMIT
)
3466 newts
[1].tv_sec
= VNOVAL
;
3467 else if (newts
[1].tv_nsec
== UTIME_NOW
)
3469 else if ((error
= itimespecfix(&newts
[1])) != 0)
3476 setutimes(struct vnode
*vp
, struct vattr
*vattr
,
3477 const struct timespec
*ts
, int nullflag
)
3479 struct thread
*td
= curthread
;
3483 vattr
->va_atime
= ts
[0];
3484 vattr
->va_mtime
= ts
[1];
3486 vattr
->va_vaflags
|= VA_UTIMES_NULL
;
3487 error
= VOP_SETATTR(vp
, vattr
, td
->td_ucred
);
3493 kern_utimes(struct nlookupdata
*nd
, struct timeval
*tptr
)
3495 struct timespec ts
[2];
3499 if ((error
= getutimes(tptr
, ts
)) != 0)
3502 error
= kern_utimensat(nd
, tptr
? ts
: NULL
, 0);
3507 * utimes_args(char *path, struct timeval *tptr)
3509 * Set the access and modification times of a file.
3512 sys_utimes(struct utimes_args
*uap
)
3514 struct timeval tv
[2];
3515 struct nlookupdata nd
;
3519 error
= copyin(uap
->tptr
, tv
, sizeof(tv
));
3523 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
3525 error
= kern_utimes(&nd
, uap
->tptr
? tv
: NULL
);
3531 * lutimes_args(char *path, struct timeval *tptr)
3533 * Set the access and modification times of a file.
3536 sys_lutimes(struct lutimes_args
*uap
)
3538 struct timeval tv
[2];
3539 struct nlookupdata nd
;
3543 error
= copyin(uap
->tptr
, tv
, sizeof(tv
));
3547 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
3549 error
= kern_utimes(&nd
, uap
->tptr
? tv
: NULL
);
3555 * Set utimes on a file descriptor. The creds used to open the
3556 * file are used to determine whether the operation is allowed
3560 kern_futimens(int fd
, struct timespec
*ts
)
3562 struct thread
*td
= curthread
;
3563 struct proc
*p
= td
->td_proc
;
3564 struct timespec newts
[2];
3571 error
= getutimens(ts
, newts
, &nullflag
);
3574 if ((error
= holdvnode(p
->p_fd
, fd
, &fp
)) != 0)
3576 if (fp
->f_nchandle
.ncp
)
3577 error
= ncp_writechk(&fp
->f_nchandle
);
3580 error
= vget(vp
, LK_EXCLUSIVE
);
3582 error
= VOP_GETATTR(vp
, &vattr
);
3584 error
= naccess_va(&vattr
, NLC_OWN
| NLC_WRITE
,
3588 error
= setutimes(vp
, &vattr
, newts
, nullflag
);
3598 * futimens_args(int fd, struct timespec *ts)
3600 * Set the access and modification times of a file.
3603 sys_futimens(struct futimens_args
*uap
)
3605 struct timespec ts
[2];
3609 error
= copyin(uap
->ts
, ts
, sizeof(ts
));
3613 error
= kern_futimens(uap
->fd
, uap
->ts
? ts
: NULL
);
3618 kern_futimes(int fd
, struct timeval
*tptr
)
3620 struct timespec ts
[2];
3624 if ((error
= getutimes(tptr
, ts
)) != 0)
3627 error
= kern_futimens(fd
, tptr
? ts
: NULL
);
3632 * futimes_args(int fd, struct timeval *tptr)
3634 * Set the access and modification times of a file.
3637 sys_futimes(struct futimes_args
*uap
)
3639 struct timeval tv
[2];
3643 error
= copyin(uap
->tptr
, tv
, sizeof(tv
));
3647 error
= kern_futimes(uap
->fd
, uap
->tptr
? tv
: NULL
);
3652 kern_utimensat(struct nlookupdata
*nd
, const struct timespec
*ts
, int flags
)
3654 struct timespec newts
[2];
3660 if (flags
& ~AT_SYMLINK_NOFOLLOW
)
3663 error
= getutimens(ts
, newts
, &nullflag
);
3667 nd
->nl_flags
|= NLC_OWN
| NLC_WRITE
;
3668 if ((error
= nlookup(nd
)) != 0)
3670 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
3672 if ((error
= cache_vref(&nd
->nl_nch
, nd
->nl_cred
, &vp
)) != 0)
3674 if ((error
= vn_writechk(vp
, &nd
->nl_nch
)) == 0) {
3675 error
= vget(vp
, LK_EXCLUSIVE
);
3677 error
= setutimes(vp
, &vattr
, newts
, nullflag
);
3686 * utimensat_args(int fd, const char *path, const struct timespec *ts, int flags);
3688 * Set file access and modification times of a file.
3691 sys_utimensat(struct utimensat_args
*uap
)
3693 struct timespec ts
[2];
3694 struct nlookupdata nd
;
3700 error
= copyin(uap
->ts
, ts
, sizeof(ts
));
3705 flags
= (uap
->flags
& AT_SYMLINK_NOFOLLOW
) ? 0 : NLC_FOLLOW
;
3706 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
,
3707 UIO_USERSPACE
, flags
);
3709 error
= kern_utimensat(&nd
, uap
->ts
? ts
: NULL
, uap
->flags
);
3710 nlookup_done_at(&nd
, fp
);
3715 kern_truncate(struct nlookupdata
*nd
, off_t length
)
3722 uint64_t old_size
= 0;
3726 nd
->nl_flags
|= NLC_WRITE
| NLC_TRUNCATE
;
3727 if ((error
= nlookup(nd
)) != 0)
3729 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
3731 if ((error
= cache_vref(&nd
->nl_nch
, nd
->nl_cred
, &vp
)) != 0)
3733 error
= vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
| LK_FAILRECLAIM
);
3738 if (vp
->v_type
== VDIR
) {
3742 if (vfs_quota_enabled
) {
3743 error
= VOP_GETATTR(vp
, &vattr
);
3744 KASSERT(error
== 0, ("kern_truncate(): VOP_GETATTR didn't return 0"));
3747 old_size
= vattr
.va_size
;
3750 if ((error
= vn_writechk(vp
, &nd
->nl_nch
)) == 0) {
3752 vattr
.va_size
= length
;
3753 error
= VOP_SETATTR(vp
, &vattr
, nd
->nl_cred
);
3754 VFS_ACCOUNT(nd
->nl_nch
.mount
, uid
, gid
, length
- old_size
);
3762 * truncate(char *path, int pad, off_t length)
3764 * Truncate a file given its path name.
3767 sys_truncate(struct truncate_args
*uap
)
3769 struct nlookupdata nd
;
3772 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
3774 error
= kern_truncate(&nd
, uap
->length
);
3780 kern_ftruncate(int fd
, off_t length
)
3782 struct thread
*td
= curthread
;
3783 struct proc
*p
= td
->td_proc
;
3790 uint64_t old_size
= 0;
3795 if ((error
= holdvnode(p
->p_fd
, fd
, &fp
)) != 0)
3797 if (fp
->f_nchandle
.ncp
) {
3798 error
= ncp_writechk(&fp
->f_nchandle
);
3802 if ((fp
->f_flag
& FWRITE
) == 0) {
3806 if (fp
->f_flag
& FAPPENDONLY
) { /* inode was set s/uapnd */
3810 vp
= (struct vnode
*)fp
->f_data
;
3811 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
3812 if (vp
->v_type
== VDIR
) {
3818 if (vfs_quota_enabled
) {
3819 error
= VOP_GETATTR(vp
, &vattr
);
3820 KASSERT(error
== 0, ("kern_ftruncate(): VOP_GETATTR didn't return 0"));
3823 old_size
= vattr
.va_size
;
3826 if ((error
= vn_writechk(vp
, NULL
)) == 0) {
3828 vattr
.va_size
= length
;
3829 error
= VOP_SETATTR(vp
, &vattr
, fp
->f_cred
);
3831 VFS_ACCOUNT(mp
, uid
, gid
, length
- old_size
);
3840 * ftruncate_args(int fd, int pad, off_t length)
3842 * Truncate a file given a file descriptor.
3845 sys_ftruncate(struct ftruncate_args
*uap
)
3849 error
= kern_ftruncate(uap
->fd
, uap
->length
);
3857 * Sync an open file.
3860 sys_fsync(struct fsync_args
*uap
)
3862 struct thread
*td
= curthread
;
3863 struct proc
*p
= td
->td_proc
;
3869 if ((error
= holdvnode(p
->p_fd
, uap
->fd
, &fp
)) != 0)
3871 vp
= (struct vnode
*)fp
->f_data
;
3872 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
3873 if ((obj
= vp
->v_object
) != NULL
) {
3874 if (vp
->v_mount
== NULL
||
3875 (vp
->v_mount
->mnt_kern_flag
& MNTK_NOMSYNC
) == 0) {
3876 vm_object_page_clean(obj
, 0, 0, 0);
3879 error
= VOP_FSYNC(vp
, MNT_WAIT
, VOP_FSYNC_SYSCALL
);
3880 if (error
== 0 && vp
->v_mount
)
3881 error
= buf_fsync(vp
);
3889 kern_rename(struct nlookupdata
*fromnd
, struct nlookupdata
*tond
)
3891 struct nchandle fnchd
;
3892 struct nchandle tnchd
;
3893 struct namecache
*ncp
;
3902 fromnd
->nl_flags
|= NLC_REFDVP
| NLC_RENAME_SRC
;
3903 if ((error
= nlookup(fromnd
)) != 0)
3905 if ((fnchd
.ncp
= fromnd
->nl_nch
.ncp
->nc_parent
) == NULL
)
3907 fnchd
.mount
= fromnd
->nl_nch
.mount
;
3911 * unlock the source nch so we can lookup the target nch without
3912 * deadlocking. The target may or may not exist so we do not check
3913 * for a target vp like kern_mkdir() and other creation functions do.
3915 * The source and target directories are ref'd and rechecked after
3916 * everything is relocked to determine if the source or target file
3919 KKASSERT(fromnd
->nl_flags
& NLC_NCPISLOCKED
);
3920 fromnd
->nl_flags
&= ~NLC_NCPISLOCKED
;
3922 fncp_gen
= fromnd
->nl_nch
.ncp
->nc_generation
;
3924 cache_unlock(&fromnd
->nl_nch
);
3926 tond
->nl_flags
|= NLC_RENAME_DST
| NLC_REFDVP
;
3927 if ((error
= nlookup(tond
)) != 0) {
3931 tncp_gen
= tond
->nl_nch
.ncp
->nc_generation
;
3933 if ((tnchd
.ncp
= tond
->nl_nch
.ncp
->nc_parent
) == NULL
) {
3937 tnchd
.mount
= tond
->nl_nch
.mount
;
3941 * If the source and target are the same there is nothing to do
3943 if (fromnd
->nl_nch
.ncp
== tond
->nl_nch
.ncp
) {
3950 * Mount points cannot be renamed or overwritten
3952 if ((fromnd
->nl_nch
.ncp
->nc_flag
| tond
->nl_nch
.ncp
->nc_flag
) &
3961 * Relock the source ncp. cache_relock() will deal with any
3962 * deadlocks against the already-locked tond and will also
3963 * make sure both are resolved.
3965 * NOTE AFTER RELOCKING: The source or target ncp may have become
3966 * invalid while they were unlocked, nc_vp and nc_mount could
3969 cache_relock(&fromnd
->nl_nch
, fromnd
->nl_cred
,
3970 &tond
->nl_nch
, tond
->nl_cred
);
3971 fromnd
->nl_flags
|= NLC_NCPISLOCKED
;
3974 * If the namecache generation changed for either fromnd or tond,
3977 if (fromnd
->nl_nch
.ncp
->nc_generation
!= fncp_gen
||
3978 tond
->nl_nch
.ncp
->nc_generation
!= tncp_gen
) {
3979 kprintf("kern_rename: retry due to gen on: "
3980 "\"%s\" -> \"%s\"\n",
3981 fromnd
->nl_nch
.ncp
->nc_name
,
3982 tond
->nl_nch
.ncp
->nc_name
);
3989 * If either fromnd or tond are marked destroyed a ripout occured
3990 * out from under us and we must retry.
3992 if ((fromnd
->nl_nch
.ncp
->nc_flag
& (NCF_DESTROYED
| NCF_UNRESOLVED
)) ||
3993 fromnd
->nl_nch
.ncp
->nc_vp
== NULL
||
3994 (tond
->nl_nch
.ncp
->nc_flag
& NCF_DESTROYED
)) {
3995 kprintf("kern_rename: retry due to ripout on: "
3996 "\"%s\" -> \"%s\"\n",
3997 fromnd
->nl_nch
.ncp
->nc_name
,
3998 tond
->nl_nch
.ncp
->nc_name
);
4005 * Make sure the parent directories linkages are the same.
4006 * XXX shouldn't be needed any more w/ generation check above.
4008 if (fnchd
.ncp
!= fromnd
->nl_nch
.ncp
->nc_parent
||
4009 tnchd
.ncp
!= tond
->nl_nch
.ncp
->nc_parent
) {
4016 * Both the source and target must be within the same filesystem and
4017 * in the same filesystem as their parent directories within the
4018 * namecache topology.
4020 * NOTE: fromnd's nc_mount or nc_vp could be NULL.
4023 if (mp
!= tnchd
.mount
|| mp
!= fromnd
->nl_nch
.mount
||
4024 mp
!= tond
->nl_nch
.mount
) {
4031 * Make sure the mount point is writable
4033 if ((error
= ncp_writechk(&tond
->nl_nch
)) != 0) {
4040 * If the target exists and either the source or target is a directory,
4041 * then both must be directories.
4043 * Due to relocking of the source, fromnd->nl_nch.ncp->nc_vp might h
4046 if (tond
->nl_nch
.ncp
->nc_vp
) {
4047 if (fromnd
->nl_nch
.ncp
->nc_vp
== NULL
) {
4049 } else if (fromnd
->nl_nch
.ncp
->nc_vp
->v_type
== VDIR
) {
4050 if (tond
->nl_nch
.ncp
->nc_vp
->v_type
!= VDIR
)
4052 } else if (tond
->nl_nch
.ncp
->nc_vp
->v_type
== VDIR
) {
4058 * You cannot rename a source into itself or a subdirectory of itself.
4059 * We check this by travsersing the target directory upwards looking
4060 * for a match against the source.
4065 for (ncp
= tnchd
.ncp
; ncp
; ncp
= ncp
->nc_parent
) {
4066 if (fromnd
->nl_nch
.ncp
== ncp
) {
4077 * Even though the namespaces are different, they may still represent
4078 * hardlinks to the same file. The filesystem might have a hard time
4079 * with this so we issue a NREMOVE of the source instead of a NRENAME
4080 * when we detect the situation.
4083 fdvp
= fromnd
->nl_dvp
;
4084 tdvp
= tond
->nl_dvp
;
4085 if (fdvp
== NULL
|| tdvp
== NULL
) {
4087 } else if (fromnd
->nl_nch
.ncp
->nc_vp
== tond
->nl_nch
.ncp
->nc_vp
) {
4088 error
= VOP_NREMOVE(&fromnd
->nl_nch
, fdvp
,
4091 error
= VOP_NRENAME(&fromnd
->nl_nch
, &tond
->nl_nch
,
4092 fdvp
, tdvp
, tond
->nl_cred
);
4099 * rename_args(char *from, char *to)
4101 * Rename files. Source and destination must either both be directories,
4102 * or both not be directories. If target is a directory, it must be empty.
4105 sys_rename(struct rename_args
*uap
)
4107 struct nlookupdata fromnd
, tond
;
4111 error
= nlookup_init(&fromnd
, uap
->from
, UIO_USERSPACE
, 0);
4113 error
= nlookup_init(&tond
, uap
->to
, UIO_USERSPACE
, 0);
4115 error
= kern_rename(&fromnd
, &tond
);
4116 nlookup_done(&tond
);
4118 nlookup_done(&fromnd
);
4119 } while (error
== EAGAIN
);
4124 * renameat_args(int oldfd, char *old, int newfd, char *new)
4126 * Rename files using paths relative to the directories associated with
4127 * oldfd and newfd. Source and destination must either both be directories,
4128 * or both not be directories. If target is a directory, it must be empty.
4131 sys_renameat(struct renameat_args
*uap
)
4133 struct nlookupdata oldnd
, newnd
;
4134 struct file
*oldfp
, *newfp
;
4138 error
= nlookup_init_at(&oldnd
, &oldfp
,
4139 uap
->oldfd
, uap
->old
,
4142 error
= nlookup_init_at(&newnd
, &newfp
,
4143 uap
->newfd
, uap
->new,
4146 error
= kern_rename(&oldnd
, &newnd
);
4147 nlookup_done_at(&newnd
, newfp
);
4149 nlookup_done_at(&oldnd
, oldfp
);
4150 } while (error
== EAGAIN
);
4155 kern_mkdir(struct nlookupdata
*nd
, int mode
)
4157 struct thread
*td
= curthread
;
4158 struct proc
*p
= td
->td_proc
;
4164 nd
->nl_flags
|= NLC_WILLBEDIR
| NLC_CREATE
| NLC_REFDVP
;
4165 if ((error
= nlookup(nd
)) != 0)
4168 if (nd
->nl_nch
.ncp
->nc_vp
)
4170 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
4173 vattr
.va_type
= VDIR
;
4174 vattr
.va_mode
= (mode
& ACCESSPERMS
) &~ p
->p_fd
->fd_cmask
;
4177 error
= VOP_NMKDIR(&nd
->nl_nch
, nd
->nl_dvp
, &vp
, td
->td_ucred
, &vattr
);
4184 * mkdir_args(char *path, int mode)
4186 * Make a directory file.
4189 sys_mkdir(struct mkdir_args
*uap
)
4191 struct nlookupdata nd
;
4194 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
4196 error
= kern_mkdir(&nd
, uap
->mode
);
4202 * mkdirat_args(int fd, char *path, mode_t mode)
4204 * Make a directory file. The path is relative to the directory associated
4208 sys_mkdirat(struct mkdirat_args
*uap
)
4210 struct nlookupdata nd
;
4214 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
, UIO_USERSPACE
, 0);
4216 error
= kern_mkdir(&nd
, uap
->mode
);
4217 nlookup_done_at(&nd
, fp
);
4222 kern_rmdir(struct nlookupdata
*nd
)
4227 nd
->nl_flags
|= NLC_DELETE
| NLC_REFDVP
;
4228 if ((error
= nlookup(nd
)) != 0)
4232 * Do not allow directories representing mount points to be
4233 * deleted, even if empty. Check write perms on mount point
4234 * in case the vnode is aliased (aka nullfs).
4236 if (nd
->nl_nch
.ncp
->nc_flag
& (NCF_ISMOUNTPT
))
4238 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
4240 error
= VOP_NRMDIR(&nd
->nl_nch
, nd
->nl_dvp
, nd
->nl_cred
);
4245 * rmdir_args(char *path)
4247 * Remove a directory file.
4250 sys_rmdir(struct rmdir_args
*uap
)
4252 struct nlookupdata nd
;
4255 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
4257 error
= kern_rmdir(&nd
);
4263 kern_getdirentries(int fd
, char *buf
, u_int count
, long *basep
, int *res
,
4264 enum uio_seg direction
)
4266 struct thread
*td
= curthread
;
4267 struct proc
*p
= td
->td_proc
;
4275 if ((error
= holdvnode(p
->p_fd
, fd
, &fp
)) != 0)
4277 if ((fp
->f_flag
& FREAD
) == 0) {
4281 vp
= (struct vnode
*)fp
->f_data
;
4282 if (vp
->v_type
!= VDIR
) {
4286 aiov
.iov_base
= buf
;
4287 aiov
.iov_len
= count
;
4288 auio
.uio_iov
= &aiov
;
4289 auio
.uio_iovcnt
= 1;
4290 auio
.uio_rw
= UIO_READ
;
4291 auio
.uio_segflg
= direction
;
4293 auio
.uio_resid
= count
;
4294 loff
= auio
.uio_offset
= fp
->f_offset
;
4295 error
= VOP_READDIR(vp
, &auio
, fp
->f_cred
, &eofflag
, NULL
, NULL
);
4296 fp
->f_offset
= auio
.uio_offset
;
4301 * WARNING! *basep may not be wide enough to accomodate the
4302 * seek offset. XXX should we hack this to return the upper 32 bits
4303 * for offsets greater then 4G?
4306 *basep
= (long)loff
;
4308 *res
= count
- auio
.uio_resid
;
4315 * getdirentries_args(int fd, char *buf, u_int conut, long *basep)
4317 * Read a block of directory entries in a file system independent format.
4320 sys_getdirentries(struct getdirentries_args
*uap
)
4325 error
= kern_getdirentries(uap
->fd
, uap
->buf
, uap
->count
, &base
,
4326 &uap
->sysmsg_result
, UIO_USERSPACE
);
4328 if (error
== 0 && uap
->basep
)
4329 error
= copyout(&base
, uap
->basep
, sizeof(*uap
->basep
));
4334 * getdents_args(int fd, char *buf, size_t count)
4337 sys_getdents(struct getdents_args
*uap
)
4341 error
= kern_getdirentries(uap
->fd
, uap
->buf
, uap
->count
, NULL
,
4342 &uap
->sysmsg_result
, UIO_USERSPACE
);
4348 * Set the mode mask for creation of filesystem nodes.
4350 * umask(int newmask)
4353 sys_umask(struct umask_args
*uap
)
4355 struct thread
*td
= curthread
;
4356 struct proc
*p
= td
->td_proc
;
4357 struct filedesc
*fdp
;
4360 uap
->sysmsg_result
= fdp
->fd_cmask
;
4361 fdp
->fd_cmask
= uap
->newmask
& ALLPERMS
;
4366 * revoke(char *path)
4368 * Void all references to file by ripping underlying filesystem
4372 sys_revoke(struct revoke_args
*uap
)
4374 struct nlookupdata nd
;
4381 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
4383 error
= nlookup(&nd
);
4385 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
4386 cred
= crhold(nd
.nl_cred
);
4390 error
= VOP_GETATTR(vp
, &vattr
);
4391 if (error
== 0 && cred
->cr_uid
!= vattr
.va_uid
)
4392 error
= priv_check_cred(cred
, PRIV_VFS_REVOKE
, 0);
4393 if (error
== 0 && (vp
->v_type
== VCHR
|| vp
->v_type
== VBLK
)) {
4395 error
= vrevoke(vp
, cred
);
4396 } else if (error
== 0) {
4397 error
= vrevoke(vp
, cred
);
4407 * getfh_args(char *fname, fhandle_t *fhp)
4409 * Get (NFS) file handle
4411 * NOTE: We use the fsid of the covering mount, even if it is a nullfs
4412 * mount. This allows nullfs mounts to be explicitly exported.
4414 * WARNING: nullfs mounts of HAMMER PFS ROOTs are safe.
4416 * nullfs mounts of subdirectories are not safe. That is, it will
4417 * work, but you do not really have protection against access to
4418 * the related parent directories.
4421 sys_getfh(struct getfh_args
*uap
)
4423 struct thread
*td
= curthread
;
4424 struct nlookupdata nd
;
4431 * Must be super user
4433 if ((error
= priv_check(td
, PRIV_ROOT
)) != 0)
4437 error
= nlookup_init(&nd
, uap
->fname
, UIO_USERSPACE
, NLC_FOLLOW
);
4439 error
= nlookup(&nd
);
4441 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_EXCLUSIVE
, &vp
);
4442 mp
= nd
.nl_nch
.mount
;
4445 bzero(&fh
, sizeof(fh
));
4446 fh
.fh_fsid
= mp
->mnt_stat
.f_fsid
;
4447 error
= VFS_VPTOFH(vp
, &fh
.fh_fid
);
4450 error
= copyout(&fh
, uap
->fhp
, sizeof(fh
));
4456 * fhopen_args(const struct fhandle *u_fhp, int flags)
4458 * syscall for the rpc.lockd to use to translate a NFS file handle into
4459 * an open descriptor.
4461 * warning: do not remove the priv_check() call or this becomes one giant
4465 sys_fhopen(struct fhopen_args
*uap
)
4467 struct thread
*td
= curthread
;
4468 struct filedesc
*fdp
= td
->td_proc
->p_fd
;
4473 struct vattr
*vap
= &vat
;
4475 int fmode
, mode
, error
= 0, type
;
4481 * Must be super user
4483 error
= priv_check(td
, PRIV_ROOT
);
4487 fmode
= FFLAGS(uap
->flags
);
4490 * Why not allow a non-read/write open for our lockd?
4492 if (((fmode
& (FREAD
| FWRITE
)) == 0) || (fmode
& O_CREAT
))
4494 error
= copyin(uap
->u_fhp
, &fhp
, sizeof(fhp
));
4499 * Find the mount point
4501 mp
= vfs_getvfs(&fhp
.fh_fsid
);
4506 /* now give me my vnode, it gets returned to me locked */
4507 error
= VFS_FHTOVP(mp
, NULL
, &fhp
.fh_fid
, &vp
);
4511 * from now on we have to make sure not
4512 * to forget about the vnode
4513 * any error that causes an abort must vput(vp)
4514 * just set error = err and 'goto bad;'.
4520 if (vp
->v_type
== VLNK
) {
4524 if (vp
->v_type
== VSOCK
) {
4529 if (fmode
& (FWRITE
| O_TRUNC
)) {
4530 if (vp
->v_type
== VDIR
) {
4534 error
= vn_writechk(vp
, NULL
);
4542 error
= VOP_ACCESS(vp
, mode
, td
->td_ucred
);
4546 if (fmode
& O_TRUNC
) {
4547 vn_unlock(vp
); /* XXX */
4548 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
); /* XXX */
4551 error
= VOP_SETATTR(vp
, vap
, td
->td_ucred
);
4557 * VOP_OPEN needs the file pointer so it can potentially override
4560 * WARNING! no f_nchandle will be associated when fhopen()ing a
4563 if ((error
= falloc(td
->td_lwp
, &nfp
, &indx
)) != 0)
4567 error
= VOP_OPEN(vp
, fmode
, td
->td_ucred
, fp
);
4570 * setting f_ops this way prevents VOP_CLOSE from being
4571 * called or fdrop() releasing the vp from v_data. Since
4572 * the VOP_OPEN failed we don't want to VOP_CLOSE.
4574 fp
->f_ops
= &badfileops
;
4580 * The fp is given its own reference, we still have our ref and lock.
4582 * Assert that all regular files must be created with a VM object.
4584 if (vp
->v_type
== VREG
&& vp
->v_object
== NULL
) {
4585 kprintf("fhopen: regular file did not have VM object: %p\n", vp
);
4590 * The open was successful. Handle any locking requirements.
4592 if (fmode
& (O_EXLOCK
| O_SHLOCK
)) {
4593 lf
.l_whence
= SEEK_SET
;
4596 if (fmode
& O_EXLOCK
)
4597 lf
.l_type
= F_WRLCK
;
4599 lf
.l_type
= F_RDLCK
;
4600 if (fmode
& FNONBLOCK
)
4605 if ((error
= VOP_ADVLOCK(vp
, (caddr_t
)fp
, F_SETLK
, &lf
, type
)) != 0) {
4607 * release our private reference.
4609 fsetfd(fdp
, NULL
, indx
);
4614 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
4615 atomic_set_int(&fp
->f_flag
, FHASLOCK
); /* race ok */
4619 * Clean up. Associate the file pointer with the previously
4620 * reserved descriptor and return it.
4623 if (uap
->flags
& O_CLOEXEC
)
4624 fdp
->fd_files
[indx
].fileflags
|= UF_EXCLOSE
;
4625 fsetfd(fdp
, fp
, indx
);
4627 uap
->sysmsg_result
= indx
;
4631 fsetfd(fdp
, NULL
, indx
);
4640 * fhstat_args(struct fhandle *u_fhp, struct stat *sb)
4643 sys_fhstat(struct fhstat_args
*uap
)
4645 struct thread
*td
= curthread
;
4653 * Must be super user
4655 error
= priv_check(td
, PRIV_ROOT
);
4659 error
= copyin(uap
->u_fhp
, &fh
, sizeof(fhandle_t
));
4663 if ((mp
= vfs_getvfs(&fh
.fh_fsid
)) == NULL
)
4666 if ((error
= VFS_FHTOVP(mp
, NULL
, &fh
.fh_fid
, &vp
)) == 0) {
4667 error
= vn_stat(vp
, &sb
, td
->td_ucred
);
4672 error
= copyout(&sb
, uap
->sb
, sizeof(sb
));
4677 * fhstatfs_args(struct fhandle *u_fhp, struct statfs *buf)
4680 sys_fhstatfs(struct fhstatfs_args
*uap
)
4682 struct thread
*td
= curthread
;
4683 struct proc
*p
= td
->td_proc
;
4688 char *fullpath
, *freepath
;
4693 * Must be super user
4695 if ((error
= priv_check(td
, PRIV_ROOT
)))
4698 if ((error
= copyin(uap
->u_fhp
, &fh
, sizeof(fhandle_t
))) != 0)
4701 if ((mp
= vfs_getvfs(&fh
.fh_fsid
)) == NULL
) {
4705 if (p
!= NULL
&& !chroot_visible_mnt(mp
, p
)) {
4710 if ((error
= VFS_FHTOVP(mp
, NULL
, &fh
.fh_fid
, &vp
)) != 0)
4715 if ((error
= VFS_STATFS(mp
, sp
, td
->td_ucred
)) != 0)
4718 error
= mount_path(p
, mp
, &fullpath
, &freepath
);
4721 bzero(sp
->f_mntonname
, sizeof(sp
->f_mntonname
));
4722 strlcpy(sp
->f_mntonname
, fullpath
, sizeof(sp
->f_mntonname
));
4723 kfree(freepath
, M_TEMP
);
4725 sp
->f_flags
= mp
->mnt_flag
& MNT_VISFLAGMASK
;
4726 if (priv_check(td
, PRIV_ROOT
)) {
4727 bcopy(sp
, &sb
, sizeof(sb
));
4728 sb
.f_fsid
.val
[0] = sb
.f_fsid
.val
[1] = 0;
4731 error
= copyout(sp
, uap
->buf
, sizeof(*sp
));
4737 * fhstatvfs_args(struct fhandle *u_fhp, struct statvfs *buf)
4740 sys_fhstatvfs(struct fhstatvfs_args
*uap
)
4742 struct thread
*td
= curthread
;
4743 struct proc
*p
= td
->td_proc
;
4751 * Must be super user
4753 if ((error
= priv_check(td
, PRIV_ROOT
)))
4756 if ((error
= copyin(uap
->u_fhp
, &fh
, sizeof(fhandle_t
))) != 0)
4759 if ((mp
= vfs_getvfs(&fh
.fh_fsid
)) == NULL
) {
4763 if (p
!= NULL
&& !chroot_visible_mnt(mp
, p
)) {
4768 if ((error
= VFS_FHTOVP(mp
, NULL
, &fh
.fh_fid
, &vp
)))
4771 sp
= &mp
->mnt_vstat
;
4773 if ((error
= VFS_STATVFS(mp
, sp
, td
->td_ucred
)) != 0)
4777 if (mp
->mnt_flag
& MNT_RDONLY
)
4778 sp
->f_flag
|= ST_RDONLY
;
4779 if (mp
->mnt_flag
& MNT_NOSUID
)
4780 sp
->f_flag
|= ST_NOSUID
;
4781 error
= copyout(sp
, uap
->buf
, sizeof(*sp
));
4788 * Syscall to push extended attribute configuration information into the
4789 * VFS. Accepts a path, which it converts to a mountpoint, as well as
4790 * a command (int cmd), and attribute name and misc data. For now, the
4791 * attribute name is left in userspace for consumption by the VFS_op.
4792 * It will probably be changed to be copied into sysspace by the
4793 * syscall in the future, once issues with various consumers of the
4794 * attribute code have raised their hands.
4796 * Currently this is used only by UFS Extended Attributes.
4799 sys_extattrctl(struct extattrctl_args
*uap
)
4801 struct nlookupdata nd
;
4803 char attrname
[EXTATTR_MAXNAMELEN
];
4811 if (error
== 0 && uap
->filename
) {
4812 error
= nlookup_init(&nd
, uap
->filename
, UIO_USERSPACE
,
4815 error
= nlookup(&nd
);
4817 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
4821 if (error
== 0 && uap
->attrname
) {
4822 error
= copyinstr(uap
->attrname
, attrname
, EXTATTR_MAXNAMELEN
,
4827 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
4829 error
= nlookup(&nd
);
4831 error
= ncp_writechk(&nd
.nl_nch
);
4833 error
= VFS_EXTATTRCTL(nd
.nl_nch
.mount
, uap
->cmd
, vp
,
4835 uap
->attrname
, nd
.nl_cred
);
4844 * Syscall to get a named extended attribute on a file or directory.
4847 sys_extattr_set_file(struct extattr_set_file_args
*uap
)
4849 char attrname
[EXTATTR_MAXNAMELEN
];
4850 struct nlookupdata nd
;
4856 error
= copyin(uap
->attrname
, attrname
, EXTATTR_MAXNAMELEN
);
4862 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
4864 error
= nlookup(&nd
);
4866 error
= ncp_writechk(&nd
.nl_nch
);
4868 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_EXCLUSIVE
, &vp
);
4874 bzero(&auio
, sizeof(auio
));
4875 aiov
.iov_base
= uap
->data
;
4876 aiov
.iov_len
= uap
->nbytes
;
4877 auio
.uio_iov
= &aiov
;
4878 auio
.uio_iovcnt
= 1;
4879 auio
.uio_offset
= 0;
4880 auio
.uio_resid
= uap
->nbytes
;
4881 auio
.uio_rw
= UIO_WRITE
;
4882 auio
.uio_td
= curthread
;
4884 error
= VOP_SETEXTATTR(vp
, uap
->attrnamespace
, attrname
,
4893 * Syscall to get a named extended attribute on a file or directory.
4896 sys_extattr_get_file(struct extattr_get_file_args
*uap
)
4898 char attrname
[EXTATTR_MAXNAMELEN
];
4899 struct nlookupdata nd
;
4905 error
= copyin(uap
->attrname
, attrname
, EXTATTR_MAXNAMELEN
);
4911 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
4913 error
= nlookup(&nd
);
4915 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_SHARED
, &vp
);
4921 bzero(&auio
, sizeof(auio
));
4922 aiov
.iov_base
= uap
->data
;
4923 aiov
.iov_len
= uap
->nbytes
;
4924 auio
.uio_iov
= &aiov
;
4925 auio
.uio_iovcnt
= 1;
4926 auio
.uio_offset
= 0;
4927 auio
.uio_resid
= uap
->nbytes
;
4928 auio
.uio_rw
= UIO_READ
;
4929 auio
.uio_td
= curthread
;
4931 error
= VOP_GETEXTATTR(vp
, uap
->attrnamespace
, attrname
,
4933 uap
->sysmsg_result
= uap
->nbytes
- auio
.uio_resid
;
4941 * Syscall to delete a named extended attribute from a file or directory.
4942 * Accepts attribute name. The real work happens in VOP_SETEXTATTR().
4945 sys_extattr_delete_file(struct extattr_delete_file_args
*uap
)
4947 char attrname
[EXTATTR_MAXNAMELEN
];
4948 struct nlookupdata nd
;
4952 error
= copyin(uap
->attrname
, attrname
, EXTATTR_MAXNAMELEN
);
4956 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
4958 error
= nlookup(&nd
);
4960 error
= ncp_writechk(&nd
.nl_nch
);
4962 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_EXCLUSIVE
, &vp
);
4964 error
= VOP_SETEXTATTR(vp
, uap
->attrnamespace
,
4965 attrname
, NULL
, nd
.nl_cred
);
4974 * Determine if the mount is visible to the process.
4977 chroot_visible_mnt(struct mount
*mp
, struct proc
*p
)
4979 struct nchandle nch
;
4982 * Traverse from the mount point upwards. If we hit the process
4983 * root then the mount point is visible to the process.
4985 nch
= mp
->mnt_ncmountpt
;
4987 if (nch
.mount
== p
->p_fd
->fd_nrdir
.mount
&&
4988 nch
.ncp
== p
->p_fd
->fd_nrdir
.ncp
) {
4991 if (nch
.ncp
== nch
.mount
->mnt_ncmountpt
.ncp
) {
4992 nch
= nch
.mount
->mnt_ncmounton
;
4994 nch
.ncp
= nch
.ncp
->nc_parent
;
4999 * If the mount point is not visible to the process, but the
5000 * process root is in a subdirectory of the mount, return
5003 if (p
->p_fd
->fd_nrdir
.mount
== mp
)