2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94
39 * $FreeBSD: src/sys/kern/vfs_syscalls.c,v 1.151.2.18 2003/04/04 20:35:58 tegge Exp $
40 * $DragonFly: src/sys/kern/vfs_syscalls.c,v 1.135 2008/11/11 00:55:49 pavalos Exp $
43 #include <sys/param.h>
44 #include <sys/systm.h>
47 #include <sys/sysent.h>
48 #include <sys/malloc.h>
49 #include <sys/mount.h>
50 #include <sys/mountctl.h>
51 #include <sys/sysproto.h>
52 #include <sys/filedesc.h>
53 #include <sys/kernel.h>
54 #include <sys/fcntl.h>
56 #include <sys/linker.h>
58 #include <sys/unistd.h>
59 #include <sys/vnode.h>
63 #include <sys/namei.h>
64 #include <sys/nlookup.h>
65 #include <sys/dirent.h>
66 #include <sys/extattr.h>
67 #include <sys/spinlock.h>
68 #include <sys/kern_syscall.h>
69 #include <sys/objcache.h>
70 #include <sys/sysctl.h>
73 #include <sys/file2.h>
74 #include <sys/spinlock2.h>
77 #include <vm/vm_object.h>
78 #include <vm/vm_page.h>
80 #include <machine/limits.h>
81 #include <machine/stdarg.h>
83 #include <vfs/union/union.h>
85 static void mount_warning(struct mount
*mp
, const char *ctl
, ...);
86 static int mount_path(struct proc
*p
, struct mount
*mp
, char **rb
, char **fb
);
87 static int checkvp_chdir (struct vnode
*vn
, struct thread
*td
);
88 static void checkdirs (struct nchandle
*old_nch
, struct nchandle
*new_nch
);
89 static int chroot_refuse_vdir_fds (struct filedesc
*fdp
);
90 static int chroot_visible_mnt(struct mount
*mp
, struct proc
*p
);
91 static int getutimes (const struct timeval
*, struct timespec
*);
92 static int setfown (struct vnode
*, uid_t
, gid_t
);
93 static int setfmode (struct vnode
*, int);
94 static int setfflags (struct vnode
*, int);
95 static int setutimes (struct vnode
*, const struct timespec
*, int);
96 static int usermount
= 0; /* if 1, non-root can mount fs. */
98 int (*union_dircheckp
) (struct thread
*, struct vnode
**, struct file
*);
100 SYSCTL_INT(_vfs
, OID_AUTO
, usermount
, CTLFLAG_RW
, &usermount
, 0, "");
103 * Virtual File System System Calls
107 * Mount a file system.
110 * mount_args(char *type, char *path, int flags, caddr_t data)
114 sys_mount(struct mount_args
*uap
)
116 struct thread
*td
= curthread
;
117 struct proc
*p
= td
->td_proc
;
121 struct vfsconf
*vfsp
;
122 int error
, flag
= 0, flag2
= 0;
125 struct nlookupdata nd
;
126 char fstypename
[MFSNAMELEN
];
127 struct ucred
*cred
= p
->p_ucred
;
132 if (usermount
== 0 && (error
= priv_check(td
, PRIV_ROOT
)))
135 * Do not allow NFS export by non-root users.
137 if (uap
->flags
& MNT_EXPORTED
) {
138 error
= priv_check(td
, PRIV_ROOT
);
143 * Silently enforce MNT_NOSUID and MNT_NODEV for non-root users
145 if (priv_check(td
, PRIV_ROOT
))
146 uap
->flags
|= MNT_NOSUID
| MNT_NODEV
;
149 * Lookup the requested path and extract the nch and vnode.
151 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
153 if ((error
= nlookup(&nd
)) == 0) {
154 if (nd
.nl_nch
.ncp
->nc_vp
== NULL
)
164 * Extract the locked+refd ncp and cleanup the nd structure
167 cache_zero(&nd
.nl_nch
);
170 if ((nch
.ncp
->nc_flag
& NCF_ISMOUNTPT
) && cache_findmount(&nch
))
177 * now we have the locked ref'd nch and unreferenced vnode.
180 if ((error
= vget(vp
, LK_EXCLUSIVE
)) != 0) {
187 * Now we have an unlocked ref'd nch and a locked ref'd vp
189 if (uap
->flags
& MNT_UPDATE
) {
190 if ((vp
->v_flag
& (VROOT
|VPFSROOT
)) == 0) {
197 flag2
= mp
->mnt_kern_flag
;
199 * We only allow the filesystem to be reloaded if it
200 * is currently mounted read-only.
202 if ((uap
->flags
& MNT_RELOAD
) &&
203 ((mp
->mnt_flag
& MNT_RDONLY
) == 0)) {
206 return (EOPNOTSUPP
); /* Needs translation */
209 * Only root, or the user that did the original mount is
210 * permitted to update it.
212 if (mp
->mnt_stat
.f_owner
!= cred
->cr_uid
&&
213 (error
= priv_check(td
, PRIV_ROOT
))) {
218 if (vfs_busy(mp
, LK_NOWAIT
)) {
223 if ((vp
->v_flag
& VMOUNT
) != 0 || hasmount
) {
229 vp
->v_flag
|= VMOUNT
;
231 uap
->flags
& (MNT_RELOAD
| MNT_FORCE
| MNT_UPDATE
);
236 * If the user is not root, ensure that they own the directory
237 * onto which we are attempting to mount.
239 if ((error
= VOP_GETATTR(vp
, &va
)) ||
240 (va
.va_uid
!= cred
->cr_uid
&& (error
= priv_check(td
, PRIV_ROOT
)))) {
245 if ((error
= vinvalbuf(vp
, V_SAVE
, 0, 0)) != 0) {
250 if (vp
->v_type
!= VDIR
) {
255 if (vp
->v_mount
->mnt_kern_flag
& MNTK_NOSTKMNT
) {
260 if ((error
= copyinstr(uap
->type
, fstypename
, MFSNAMELEN
, NULL
)) != 0) {
265 vfsp
= vfsconf_find_by_name(fstypename
);
269 /* Only load modules for root (very important!) */
270 if ((error
= priv_check(td
, PRIV_ROOT
)) != 0) {
275 error
= linker_load_file(fstypename
, &lf
);
276 if (error
|| lf
== NULL
) {
284 /* lookup again, see if the VFS was loaded */
285 vfsp
= vfsconf_find_by_name(fstypename
);
288 linker_file_unload(lf
);
294 if ((vp
->v_flag
& VMOUNT
) != 0 || hasmount
) {
299 vp
->v_flag
|= VMOUNT
;
302 * Allocate and initialize the filesystem.
304 mp
= kmalloc(sizeof(struct mount
), M_MOUNT
, M_ZERO
|M_WAITOK
);
305 TAILQ_INIT(&mp
->mnt_nvnodelist
);
306 TAILQ_INIT(&mp
->mnt_reservedvnlist
);
307 TAILQ_INIT(&mp
->mnt_jlist
);
308 mp
->mnt_nvnodelistsize
= 0;
309 lockinit(&mp
->mnt_lock
, "vfslock", 0, 0);
310 vfs_busy(mp
, LK_NOWAIT
);
311 mp
->mnt_op
= vfsp
->vfc_vfsops
;
313 vfsp
->vfc_refcount
++;
314 mp
->mnt_stat
.f_type
= vfsp
->vfc_typenum
;
315 mp
->mnt_flag
|= vfsp
->vfc_flags
& MNT_VISFLAGMASK
;
316 strncpy(mp
->mnt_stat
.f_fstypename
, vfsp
->vfc_name
, MFSNAMELEN
);
317 mp
->mnt_stat
.f_owner
= cred
->cr_uid
;
318 mp
->mnt_iosize_max
= DFLTPHYS
;
322 * Set the mount level flags.
324 if (uap
->flags
& MNT_RDONLY
)
325 mp
->mnt_flag
|= MNT_RDONLY
;
326 else if (mp
->mnt_flag
& MNT_RDONLY
)
327 mp
->mnt_kern_flag
|= MNTK_WANTRDWR
;
328 mp
->mnt_flag
&=~ (MNT_NOSUID
| MNT_NOEXEC
| MNT_NODEV
|
329 MNT_SYNCHRONOUS
| MNT_UNION
| MNT_ASYNC
| MNT_NOATIME
|
330 MNT_NOSYMFOLLOW
| MNT_IGNORE
|
331 MNT_NOCLUSTERR
| MNT_NOCLUSTERW
| MNT_SUIDDIR
);
332 mp
->mnt_flag
|= uap
->flags
& (MNT_NOSUID
| MNT_NOEXEC
|
333 MNT_NODEV
| MNT_SYNCHRONOUS
| MNT_UNION
| MNT_ASYNC
| MNT_FORCE
|
334 MNT_NOSYMFOLLOW
| MNT_IGNORE
|
335 MNT_NOATIME
| MNT_NOCLUSTERR
| MNT_NOCLUSTERW
| MNT_SUIDDIR
);
337 * Mount the filesystem.
338 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
341 error
= VFS_MOUNT(mp
, uap
->path
, uap
->data
, cred
);
342 if (mp
->mnt_flag
& MNT_UPDATE
) {
343 if (mp
->mnt_kern_flag
& MNTK_WANTRDWR
)
344 mp
->mnt_flag
&= ~MNT_RDONLY
;
345 mp
->mnt_flag
&=~ (MNT_UPDATE
| MNT_RELOAD
| MNT_FORCE
);
346 mp
->mnt_kern_flag
&=~ MNTK_WANTRDWR
;
349 mp
->mnt_kern_flag
= flag2
;
352 vp
->v_flag
&= ~VMOUNT
;
357 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
359 * Put the new filesystem on the mount list after root. The mount
360 * point gets its own mnt_ncmountpt (unless the VFS already set one
361 * up) which represents the root of the mount. The lookup code
362 * detects the mount point going forward and checks the root of
363 * the mount going backwards.
365 * It is not necessary to invalidate or purge the vnode underneath
366 * because elements under the mount will be given their own glue
370 if (mp
->mnt_ncmountpt
.ncp
== NULL
) {
372 * allocate, then unlock, but leave the ref intact
374 cache_allocroot(&mp
->mnt_ncmountpt
, mp
, NULL
);
375 cache_unlock(&mp
->mnt_ncmountpt
);
377 mp
->mnt_ncmounton
= nch
; /* inherits ref */
378 nch
.ncp
->nc_flag
|= NCF_ISMOUNTPT
;
380 /* XXX get the root of the fs and cache_setvp(mnt_ncmountpt...) */
381 vp
->v_flag
&= ~VMOUNT
;
382 mountlist_insert(mp
, MNTINS_LAST
);
384 checkdirs(&mp
->mnt_ncmounton
, &mp
->mnt_ncmountpt
);
385 error
= vfs_allocate_syncvnode(mp
);
387 error
= VFS_START(mp
, 0);
390 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_coherency_ops
);
391 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_journal_ops
);
392 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_norm_ops
);
393 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_spec_ops
);
394 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_fifo_ops
);
395 vp
->v_flag
&= ~VMOUNT
;
396 mp
->mnt_vfc
->vfc_refcount
--;
406 * Scan all active processes to see if any of them have a current
407 * or root directory onto which the new filesystem has just been
408 * mounted. If so, replace them with the new mount point.
410 * The passed ncp is ref'd and locked (from the mount code) and
411 * must be associated with the vnode representing the root of the
414 struct checkdirs_info
{
415 struct nchandle old_nch
;
416 struct nchandle new_nch
;
417 struct vnode
*old_vp
;
418 struct vnode
*new_vp
;
421 static int checkdirs_callback(struct proc
*p
, void *data
);
424 checkdirs(struct nchandle
*old_nch
, struct nchandle
*new_nch
)
426 struct checkdirs_info info
;
432 * If the old mount point's vnode has a usecount of 1, it is not
433 * being held as a descriptor anywhere.
435 olddp
= old_nch
->ncp
->nc_vp
;
436 if (olddp
== NULL
|| olddp
->v_sysref
.refcnt
== 1)
440 * Force the root vnode of the new mount point to be resolved
441 * so we can update any matching processes.
444 if (VFS_ROOT(mp
, &newdp
))
445 panic("mount: lost mount");
446 cache_setunresolved(new_nch
);
447 cache_setvp(new_nch
, newdp
);
450 * Special handling of the root node
452 if (rootvnode
== olddp
) {
454 vfs_cache_setroot(newdp
, cache_hold(new_nch
));
458 * Pass newdp separately so the callback does not have to access
459 * it via new_nch->ncp->nc_vp.
461 info
.old_nch
= *old_nch
;
462 info
.new_nch
= *new_nch
;
464 allproc_scan(checkdirs_callback
, &info
);
469 * NOTE: callback is not MP safe because the scanned process's filedesc
470 * structure can be ripped out from under us, amoung other things.
473 checkdirs_callback(struct proc
*p
, void *data
)
475 struct checkdirs_info
*info
= data
;
476 struct filedesc
*fdp
;
477 struct nchandle ncdrop1
;
478 struct nchandle ncdrop2
;
479 struct vnode
*vprele1
;
480 struct vnode
*vprele2
;
482 if ((fdp
= p
->p_fd
) != NULL
) {
483 cache_zero(&ncdrop1
);
484 cache_zero(&ncdrop2
);
489 * MPUNSAFE - XXX fdp can be pulled out from under a
492 * A shared filedesc is ok, we don't have to copy it
493 * because we are making this change globally.
495 spin_lock_wr(&fdp
->fd_spin
);
496 if (fdp
->fd_ncdir
.mount
== info
->old_nch
.mount
&&
497 fdp
->fd_ncdir
.ncp
== info
->old_nch
.ncp
) {
498 vprele1
= fdp
->fd_cdir
;
500 fdp
->fd_cdir
= info
->new_vp
;
501 ncdrop1
= fdp
->fd_ncdir
;
502 cache_copy(&info
->new_nch
, &fdp
->fd_ncdir
);
504 if (fdp
->fd_nrdir
.mount
== info
->old_nch
.mount
&&
505 fdp
->fd_nrdir
.ncp
== info
->old_nch
.ncp
) {
506 vprele2
= fdp
->fd_rdir
;
508 fdp
->fd_rdir
= info
->new_vp
;
509 ncdrop2
= fdp
->fd_nrdir
;
510 cache_copy(&info
->new_nch
, &fdp
->fd_nrdir
);
512 spin_unlock_wr(&fdp
->fd_spin
);
514 cache_drop(&ncdrop1
);
516 cache_drop(&ncdrop2
);
526 * Unmount a file system.
528 * Note: unmount takes a path to the vnode mounted on as argument,
529 * not special file (as before).
532 * umount_args(char *path, int flags)
536 sys_unmount(struct unmount_args
*uap
)
538 struct thread
*td
= curthread
;
539 struct proc
*p
= td
->td_proc
;
540 struct mount
*mp
= NULL
;
542 struct nlookupdata nd
;
545 if (p
->p_ucred
->cr_prison
!= NULL
)
547 if (usermount
== 0 && (error
= priv_check(td
, PRIV_ROOT
)))
550 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
552 error
= nlookup(&nd
);
556 mp
= nd
.nl_nch
.mount
;
559 * Only root, or the user that did the original mount is
560 * permitted to unmount this filesystem.
562 if ((mp
->mnt_stat
.f_owner
!= p
->p_ucred
->cr_uid
) &&
563 (error
= priv_check(td
, PRIV_ROOT
)))
567 * Don't allow unmounting the root file system.
569 if (mp
->mnt_flag
& MNT_ROOTFS
) {
575 * Must be the root of the filesystem
577 if (nd
.nl_nch
.ncp
!= mp
->mnt_ncmountpt
.ncp
) {
586 return (dounmount(mp
, uap
->flags
));
590 * Do the actual file system unmount.
593 dounmount_interlock(struct mount
*mp
)
595 if (mp
->mnt_kern_flag
& MNTK_UNMOUNT
)
597 mp
->mnt_kern_flag
|= MNTK_UNMOUNT
;
602 dounmount(struct mount
*mp
, int flags
)
604 struct namecache
*ncp
;
613 * Exclusive access for unmounting purposes
615 if ((error
= mountlist_interlock(dounmount_interlock
, mp
)) != 0)
619 * Allow filesystems to detect that a forced unmount is in progress.
621 if (flags
& MNT_FORCE
)
622 mp
->mnt_kern_flag
|= MNTK_UNMOUNTF
;
623 lflags
= LK_EXCLUSIVE
| ((flags
& MNT_FORCE
) ? 0 : LK_NOWAIT
);
624 error
= lockmgr(&mp
->mnt_lock
, lflags
);
626 mp
->mnt_kern_flag
&= ~(MNTK_UNMOUNT
| MNTK_UNMOUNTF
);
627 if (mp
->mnt_kern_flag
& MNTK_MWAIT
)
632 if (mp
->mnt_flag
& MNT_EXPUBLIC
)
633 vfs_setpublicfs(NULL
, NULL
, NULL
);
635 vfs_msync(mp
, MNT_WAIT
);
636 async_flag
= mp
->mnt_flag
& MNT_ASYNC
;
637 mp
->mnt_flag
&=~ MNT_ASYNC
;
640 * If this filesystem isn't aliasing other filesystems,
641 * try to invalidate any remaining namecache entries and
642 * check the count afterwords.
644 if ((mp
->mnt_kern_flag
& MNTK_NCALIASED
) == 0) {
645 cache_lock(&mp
->mnt_ncmountpt
);
646 cache_inval(&mp
->mnt_ncmountpt
, CINV_DESTROY
|CINV_CHILDREN
);
647 cache_unlock(&mp
->mnt_ncmountpt
);
649 if ((ncp
= mp
->mnt_ncmountpt
.ncp
) != NULL
&&
650 (ncp
->nc_refs
!= 1 || TAILQ_FIRST(&ncp
->nc_list
))) {
652 if ((flags
& MNT_FORCE
) == 0) {
654 mount_warning(mp
, "Cannot unmount: "
660 mount_warning(mp
, "Forced unmount: "
671 * nchandle records ref the mount structure. Expect a count of 1
672 * (our mount->mnt_ncmountpt).
674 if (mp
->mnt_refs
!= 1) {
675 if ((flags
& MNT_FORCE
) == 0) {
676 mount_warning(mp
, "Cannot unmount: "
677 "%d process references still "
678 "present", mp
->mnt_refs
);
681 mount_warning(mp
, "Forced unmount: "
682 "%d process references still "
683 "present", mp
->mnt_refs
);
689 * Decomission our special mnt_syncer vnode. This also stops
690 * the vnlru code. If we are unable to unmount we recommission
694 if ((vp
= mp
->mnt_syncer
) != NULL
) {
695 mp
->mnt_syncer
= NULL
;
698 if (((mp
->mnt_flag
& MNT_RDONLY
) ||
699 (error
= VFS_SYNC(mp
, MNT_WAIT
)) == 0) ||
700 (flags
& MNT_FORCE
)) {
701 error
= VFS_UNMOUNT(mp
, flags
);
705 if (mp
->mnt_syncer
== NULL
)
706 vfs_allocate_syncvnode(mp
);
707 mp
->mnt_kern_flag
&= ~(MNTK_UNMOUNT
| MNTK_UNMOUNTF
);
708 mp
->mnt_flag
|= async_flag
;
709 lockmgr(&mp
->mnt_lock
, LK_RELEASE
);
710 if (mp
->mnt_kern_flag
& MNTK_MWAIT
)
715 * Clean up any journals still associated with the mount after
716 * filesystem activity has ceased.
718 journal_remove_all_journals(mp
,
719 ((flags
& MNT_FORCE
) ? MC_JOURNAL_STOP_IMM
: 0));
721 mountlist_remove(mp
);
724 * Remove any installed vnode ops here so the individual VFSs don't
727 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_coherency_ops
);
728 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_journal_ops
);
729 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_norm_ops
);
730 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_spec_ops
);
731 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_fifo_ops
);
733 if (mp
->mnt_ncmountpt
.ncp
!= NULL
) {
734 nch
= mp
->mnt_ncmountpt
;
735 cache_zero(&mp
->mnt_ncmountpt
);
736 cache_clrmountpt(&nch
);
739 if (mp
->mnt_ncmounton
.ncp
!= NULL
) {
740 nch
= mp
->mnt_ncmounton
;
741 cache_zero(&mp
->mnt_ncmounton
);
742 cache_clrmountpt(&nch
);
746 mp
->mnt_vfc
->vfc_refcount
--;
747 if (!TAILQ_EMPTY(&mp
->mnt_nvnodelist
))
748 panic("unmount: dangling vnode");
749 lockmgr(&mp
->mnt_lock
, LK_RELEASE
);
750 if (mp
->mnt_kern_flag
& MNTK_MWAIT
)
759 mount_warning(struct mount
*mp
, const char *ctl
, ...)
766 if (cache_fullpath(NULL
, &mp
->mnt_ncmounton
, &ptr
, &buf
) == 0) {
767 kprintf("unmount(%s): ", ptr
);
772 kprintf("unmount(%p", mp
);
773 if (mp
->mnt_ncmounton
.ncp
&& mp
->mnt_ncmounton
.ncp
->nc_name
)
774 kprintf(",%s", mp
->mnt_ncmounton
.ncp
->nc_name
);
783 * Shim cache_fullpath() to handle the case where a process is chrooted into
784 * a subdirectory of a mount. In this case if the root mount matches the
785 * process root directory's mount we have to specify the process's root
786 * directory instead of the mount point, because the mount point might
787 * be above the root directory.
791 mount_path(struct proc
*p
, struct mount
*mp
, char **rb
, char **fb
)
793 struct nchandle
*nch
;
795 if (p
&& p
->p_fd
->fd_nrdir
.mount
== mp
)
796 nch
= &p
->p_fd
->fd_nrdir
;
798 nch
= &mp
->mnt_ncmountpt
;
799 return(cache_fullpath(p
, nch
, rb
, fb
));
803 * Sync each mounted filesystem.
807 static int syncprt
= 0;
808 SYSCTL_INT(_debug
, OID_AUTO
, syncprt
, CTLFLAG_RW
, &syncprt
, 0, "");
811 static int sync_callback(struct mount
*mp
, void *data
);
815 sys_sync(struct sync_args
*uap
)
817 mountlist_scan(sync_callback
, NULL
, MNTSCAN_FORWARD
);
820 * print out buffer pool stat information on each sync() call.
830 sync_callback(struct mount
*mp
, void *data __unused
)
834 if ((mp
->mnt_flag
& MNT_RDONLY
) == 0) {
835 asyncflag
= mp
->mnt_flag
& MNT_ASYNC
;
836 mp
->mnt_flag
&= ~MNT_ASYNC
;
837 vfs_msync(mp
, MNT_NOWAIT
);
838 VFS_SYNC(mp
, MNT_NOWAIT
);
839 mp
->mnt_flag
|= asyncflag
;
844 /* XXX PRISON: could be per prison flag */
845 static int prison_quotas
;
847 SYSCTL_INT(_kern_prison
, OID_AUTO
, quotas
, CTLFLAG_RW
, &prison_quotas
, 0, "");
851 * quotactl_args(char *path, int fcmd, int uid, caddr_t arg)
853 * Change filesystem quotas.
857 sys_quotactl(struct quotactl_args
*uap
)
859 struct nlookupdata nd
;
867 if (p
->p_ucred
->cr_prison
&& !prison_quotas
)
870 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
872 error
= nlookup(&nd
);
874 mp
= nd
.nl_nch
.mount
;
875 error
= VFS_QUOTACTL(mp
, uap
->cmd
, uap
->uid
,
876 uap
->arg
, nd
.nl_cred
);
883 * mountctl(char *path, int op, int fd, const void *ctl, int ctllen,
884 * void *buf, int buflen)
886 * This function operates on a mount point and executes the specified
887 * operation using the specified control data, and possibly returns data.
889 * The actual number of bytes stored in the result buffer is returned, 0
890 * if none, otherwise an error is returned.
894 sys_mountctl(struct mountctl_args
*uap
)
896 struct thread
*td
= curthread
;
897 struct proc
*p
= td
->td_proc
;
905 * Sanity and permissions checks. We must be root.
908 if (p
->p_ucred
->cr_prison
!= NULL
)
910 if ((error
= priv_check(td
, PRIV_ROOT
)) != 0)
914 * Argument length checks
916 if (uap
->ctllen
< 0 || uap
->ctllen
> 1024)
918 if (uap
->buflen
< 0 || uap
->buflen
> 16 * 1024)
920 if (uap
->path
== NULL
)
924 * Allocate the necessary buffers and copyin data
926 path
= objcache_get(namei_oc
, M_WAITOK
);
927 error
= copyinstr(uap
->path
, path
, MAXPATHLEN
, NULL
);
932 ctl
= kmalloc(uap
->ctllen
+ 1, M_TEMP
, M_WAITOK
|M_ZERO
);
933 error
= copyin(uap
->ctl
, ctl
, uap
->ctllen
);
938 buf
= kmalloc(uap
->buflen
+ 1, M_TEMP
, M_WAITOK
|M_ZERO
);
941 * Validate the descriptor
944 fp
= holdfp(p
->p_fd
, uap
->fd
, -1);
954 * Execute the internal kernel function and clean up.
956 error
= kern_mountctl(path
, uap
->op
, fp
, ctl
, uap
->ctllen
, buf
, uap
->buflen
, &uap
->sysmsg_result
);
959 if (error
== 0 && uap
->sysmsg_result
> 0)
960 error
= copyout(buf
, uap
->buf
, uap
->sysmsg_result
);
963 objcache_put(namei_oc
, path
);
972 * Execute a mount control operation by resolving the path to a mount point
973 * and calling vop_mountctl().
975 * Use the mount point from the nch instead of the vnode so nullfs mounts
976 * can properly spike the VOP.
979 kern_mountctl(const char *path
, int op
, struct file
*fp
,
980 const void *ctl
, int ctllen
,
981 void *buf
, int buflen
, int *res
)
985 struct nlookupdata nd
;
990 error
= nlookup_init(&nd
, path
, UIO_SYSSPACE
, NLC_FOLLOW
);
992 error
= nlookup(&nd
);
994 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_EXCLUSIVE
, &vp
);
995 mp
= nd
.nl_nch
.mount
;
1001 * Must be the root of the filesystem
1003 if ((vp
->v_flag
& (VROOT
|VPFSROOT
)) == 0) {
1007 error
= vop_mountctl(mp
->mnt_vn_use_ops
, op
, fp
, ctl
, ctllen
,
1014 kern_statfs(struct nlookupdata
*nd
, struct statfs
*buf
)
1016 struct thread
*td
= curthread
;
1017 struct proc
*p
= td
->td_proc
;
1020 char *fullpath
, *freepath
;
1023 if ((error
= nlookup(nd
)) != 0)
1025 mp
= nd
->nl_nch
.mount
;
1027 if ((error
= VFS_STATFS(mp
, sp
, nd
->nl_cred
)) != 0)
1030 error
= mount_path(p
, mp
, &fullpath
, &freepath
);
1033 bzero(sp
->f_mntonname
, sizeof(sp
->f_mntonname
));
1034 strlcpy(sp
->f_mntonname
, fullpath
, sizeof(sp
->f_mntonname
));
1035 kfree(freepath
, M_TEMP
);
1037 sp
->f_flags
= mp
->mnt_flag
& MNT_VISFLAGMASK
;
1038 bcopy(sp
, buf
, sizeof(*buf
));
1039 /* Only root should have access to the fsid's. */
1040 if (priv_check(td
, PRIV_ROOT
))
1041 buf
->f_fsid
.val
[0] = buf
->f_fsid
.val
[1] = 0;
1046 * statfs_args(char *path, struct statfs *buf)
1048 * Get filesystem statistics.
1051 sys_statfs(struct statfs_args
*uap
)
1053 struct nlookupdata nd
;
1057 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
1059 error
= kern_statfs(&nd
, &buf
);
1062 error
= copyout(&buf
, uap
->buf
, sizeof(*uap
->buf
));
1067 kern_fstatfs(int fd
, struct statfs
*buf
)
1069 struct thread
*td
= curthread
;
1070 struct proc
*p
= td
->td_proc
;
1074 char *fullpath
, *freepath
;
1078 if ((error
= holdvnode(p
->p_fd
, fd
, &fp
)) != 0)
1080 mp
= ((struct vnode
*)fp
->f_data
)->v_mount
;
1085 if (fp
->f_cred
== NULL
) {
1090 if ((error
= VFS_STATFS(mp
, sp
, fp
->f_cred
)) != 0)
1093 if ((error
= mount_path(p
, mp
, &fullpath
, &freepath
)) != 0)
1095 bzero(sp
->f_mntonname
, sizeof(sp
->f_mntonname
));
1096 strlcpy(sp
->f_mntonname
, fullpath
, sizeof(sp
->f_mntonname
));
1097 kfree(freepath
, M_TEMP
);
1099 sp
->f_flags
= mp
->mnt_flag
& MNT_VISFLAGMASK
;
1100 bcopy(sp
, buf
, sizeof(*buf
));
1102 /* Only root should have access to the fsid's. */
1103 if (priv_check(td
, PRIV_ROOT
))
1104 buf
->f_fsid
.val
[0] = buf
->f_fsid
.val
[1] = 0;
1112 * fstatfs_args(int fd, struct statfs *buf)
1114 * Get filesystem statistics.
1117 sys_fstatfs(struct fstatfs_args
*uap
)
1122 error
= kern_fstatfs(uap
->fd
, &buf
);
1125 error
= copyout(&buf
, uap
->buf
, sizeof(*uap
->buf
));
1130 kern_statvfs(struct nlookupdata
*nd
, struct statvfs
*buf
)
1136 if ((error
= nlookup(nd
)) != 0)
1138 mp
= nd
->nl_nch
.mount
;
1139 sp
= &mp
->mnt_vstat
;
1140 if ((error
= VFS_STATVFS(mp
, sp
, nd
->nl_cred
)) != 0)
1144 if (mp
->mnt_flag
& MNT_RDONLY
)
1145 sp
->f_flag
|= ST_RDONLY
;
1146 if (mp
->mnt_flag
& MNT_NOSUID
)
1147 sp
->f_flag
|= ST_NOSUID
;
1148 bcopy(sp
, buf
, sizeof(*buf
));
1153 * statfs_args(char *path, struct statfs *buf)
1155 * Get filesystem statistics.
1158 sys_statvfs(struct statvfs_args
*uap
)
1160 struct nlookupdata nd
;
1164 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
1166 error
= kern_statvfs(&nd
, &buf
);
1169 error
= copyout(&buf
, uap
->buf
, sizeof(*uap
->buf
));
1174 kern_fstatvfs(int fd
, struct statvfs
*buf
)
1176 struct thread
*td
= curthread
;
1177 struct proc
*p
= td
->td_proc
;
1184 if ((error
= holdvnode(p
->p_fd
, fd
, &fp
)) != 0)
1186 mp
= ((struct vnode
*)fp
->f_data
)->v_mount
;
1191 if (fp
->f_cred
== NULL
) {
1195 sp
= &mp
->mnt_vstat
;
1196 if ((error
= VFS_STATVFS(mp
, sp
, fp
->f_cred
)) != 0)
1200 if (mp
->mnt_flag
& MNT_RDONLY
)
1201 sp
->f_flag
|= ST_RDONLY
;
1202 if (mp
->mnt_flag
& MNT_NOSUID
)
1203 sp
->f_flag
|= ST_NOSUID
;
1205 bcopy(sp
, buf
, sizeof(*buf
));
1213 * fstatfs_args(int fd, struct statfs *buf)
1215 * Get filesystem statistics.
1218 sys_fstatvfs(struct fstatvfs_args
*uap
)
1223 error
= kern_fstatvfs(uap
->fd
, &buf
);
1226 error
= copyout(&buf
, uap
->buf
, sizeof(*uap
->buf
));
1231 * getfsstat_args(struct statfs *buf, long bufsize, int flags)
1233 * Get statistics on all filesystems.
1236 struct getfsstat_info
{
1237 struct statfs
*sfsp
;
1245 static int getfsstat_callback(struct mount
*, void *);
1249 sys_getfsstat(struct getfsstat_args
*uap
)
1251 struct thread
*td
= curthread
;
1252 struct proc
*p
= td
->td_proc
;
1253 struct getfsstat_info info
;
1255 bzero(&info
, sizeof(info
));
1257 info
.maxcount
= uap
->bufsize
/ sizeof(struct statfs
);
1258 info
.sfsp
= uap
->buf
;
1260 info
.flags
= uap
->flags
;
1263 mountlist_scan(getfsstat_callback
, &info
, MNTSCAN_FORWARD
);
1264 if (info
.sfsp
&& info
.count
> info
.maxcount
)
1265 uap
->sysmsg_result
= info
.maxcount
;
1267 uap
->sysmsg_result
= info
.count
;
1268 return (info
.error
);
1272 getfsstat_callback(struct mount
*mp
, void *data
)
1274 struct getfsstat_info
*info
= data
;
1280 if (info
->sfsp
&& info
->count
< info
->maxcount
) {
1281 if (info
->p
&& !chroot_visible_mnt(mp
, info
->p
))
1286 * If MNT_NOWAIT or MNT_LAZY is specified, do not
1287 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
1288 * overrides MNT_WAIT.
1290 if (((info
->flags
& (MNT_LAZY
|MNT_NOWAIT
)) == 0 ||
1291 (info
->flags
& MNT_WAIT
)) &&
1292 (error
= VFS_STATFS(mp
, sp
, info
->p
->p_ucred
))) {
1295 sp
->f_flags
= mp
->mnt_flag
& MNT_VISFLAGMASK
;
1297 error
= mount_path(info
->p
, mp
, &fullpath
, &freepath
);
1299 info
->error
= error
;
1302 bzero(sp
->f_mntonname
, sizeof(sp
->f_mntonname
));
1303 strlcpy(sp
->f_mntonname
, fullpath
, sizeof(sp
->f_mntonname
));
1304 kfree(freepath
, M_TEMP
);
1306 error
= copyout(sp
, info
->sfsp
, sizeof(*sp
));
1308 info
->error
= error
;
1318 * getvfsstat_args(struct statfs *buf, struct statvfs *vbuf,
1319 long bufsize, int flags)
1321 * Get statistics on all filesystems.
1324 struct getvfsstat_info
{
1325 struct statfs
*sfsp
;
1326 struct statvfs
*vsfsp
;
1334 static int getvfsstat_callback(struct mount
*, void *);
1338 sys_getvfsstat(struct getvfsstat_args
*uap
)
1340 struct thread
*td
= curthread
;
1341 struct proc
*p
= td
->td_proc
;
1342 struct getvfsstat_info info
;
1344 bzero(&info
, sizeof(info
));
1346 info
.maxcount
= uap
->vbufsize
/ sizeof(struct statvfs
);
1347 info
.sfsp
= uap
->buf
;
1348 info
.vsfsp
= uap
->vbuf
;
1350 info
.flags
= uap
->flags
;
1353 mountlist_scan(getvfsstat_callback
, &info
, MNTSCAN_FORWARD
);
1354 if (info
.vsfsp
&& info
.count
> info
.maxcount
)
1355 uap
->sysmsg_result
= info
.maxcount
;
1357 uap
->sysmsg_result
= info
.count
;
1358 return (info
.error
);
1362 getvfsstat_callback(struct mount
*mp
, void *data
)
1364 struct getvfsstat_info
*info
= data
;
1366 struct statvfs
*vsp
;
1371 if (info
->vsfsp
&& info
->count
< info
->maxcount
) {
1372 if (info
->p
&& !chroot_visible_mnt(mp
, info
->p
))
1375 vsp
= &mp
->mnt_vstat
;
1378 * If MNT_NOWAIT or MNT_LAZY is specified, do not
1379 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
1380 * overrides MNT_WAIT.
1382 if (((info
->flags
& (MNT_LAZY
|MNT_NOWAIT
)) == 0 ||
1383 (info
->flags
& MNT_WAIT
)) &&
1384 (error
= VFS_STATFS(mp
, sp
, info
->p
->p_ucred
))) {
1387 sp
->f_flags
= mp
->mnt_flag
& MNT_VISFLAGMASK
;
1389 if (((info
->flags
& (MNT_LAZY
|MNT_NOWAIT
)) == 0 ||
1390 (info
->flags
& MNT_WAIT
)) &&
1391 (error
= VFS_STATVFS(mp
, vsp
, info
->p
->p_ucred
))) {
1395 if (mp
->mnt_flag
& MNT_RDONLY
)
1396 vsp
->f_flag
|= ST_RDONLY
;
1397 if (mp
->mnt_flag
& MNT_NOSUID
)
1398 vsp
->f_flag
|= ST_NOSUID
;
1400 error
= mount_path(info
->p
, mp
, &fullpath
, &freepath
);
1402 info
->error
= error
;
1405 bzero(sp
->f_mntonname
, sizeof(sp
->f_mntonname
));
1406 strlcpy(sp
->f_mntonname
, fullpath
, sizeof(sp
->f_mntonname
));
1407 kfree(freepath
, M_TEMP
);
1409 error
= copyout(sp
, info
->sfsp
, sizeof(*sp
));
1411 error
= copyout(vsp
, info
->vsfsp
, sizeof(*vsp
));
1413 info
->error
= error
;
1425 * fchdir_args(int fd)
1427 * Change current working directory to a given file descriptor.
1431 sys_fchdir(struct fchdir_args
*uap
)
1433 struct thread
*td
= curthread
;
1434 struct proc
*p
= td
->td_proc
;
1435 struct filedesc
*fdp
= p
->p_fd
;
1436 struct vnode
*vp
, *ovp
;
1439 struct nchandle nch
, onch
, tnch
;
1442 if ((error
= holdvnode(fdp
, uap
->fd
, &fp
)) != 0)
1444 vp
= (struct vnode
*)fp
->f_data
;
1446 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
1447 if (vp
->v_type
!= VDIR
|| fp
->f_nchandle
.ncp
== NULL
)
1450 error
= VOP_ACCESS(vp
, VEXEC
, p
->p_ucred
);
1456 cache_copy(&fp
->f_nchandle
, &nch
);
1459 * If the ncp has become a mount point, traverse through
1463 while (!error
&& (nch
.ncp
->nc_flag
& NCF_ISMOUNTPT
) &&
1464 (mp
= cache_findmount(&nch
)) != NULL
1466 error
= nlookup_mp(mp
, &tnch
);
1468 cache_unlock(&tnch
); /* leave ref intact */
1470 vp
= tnch
.ncp
->nc_vp
;
1471 error
= vget(vp
, LK_SHARED
);
1472 KKASSERT(error
== 0);
1479 onch
= fdp
->fd_ncdir
;
1480 vn_unlock(vp
); /* leave ref intact */
1482 fdp
->fd_ncdir
= nch
;
1494 kern_chdir(struct nlookupdata
*nd
)
1496 struct thread
*td
= curthread
;
1497 struct proc
*p
= td
->td_proc
;
1498 struct filedesc
*fdp
= p
->p_fd
;
1499 struct vnode
*vp
, *ovp
;
1500 struct nchandle onch
;
1503 if ((error
= nlookup(nd
)) != 0)
1505 if ((vp
= nd
->nl_nch
.ncp
->nc_vp
) == NULL
)
1507 if ((error
= vget(vp
, LK_SHARED
)) != 0)
1510 error
= checkvp_chdir(vp
, td
);
1514 onch
= fdp
->fd_ncdir
;
1515 cache_unlock(&nd
->nl_nch
); /* leave reference intact */
1516 fdp
->fd_ncdir
= nd
->nl_nch
;
1520 cache_zero(&nd
->nl_nch
);
1528 * chdir_args(char *path)
1530 * Change current working directory (``.'').
1533 sys_chdir(struct chdir_args
*uap
)
1535 struct nlookupdata nd
;
1538 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
1540 error
= kern_chdir(&nd
);
1546 * Helper function for raised chroot(2) security function: Refuse if
1547 * any filedescriptors are open directories.
1550 chroot_refuse_vdir_fds(struct filedesc
*fdp
)
1557 for (fd
= 0; fd
< fdp
->fd_nfiles
; fd
++) {
1558 if ((error
= holdvnode(fdp
, fd
, &fp
)) != 0)
1560 vp
= (struct vnode
*)fp
->f_data
;
1561 if (vp
->v_type
!= VDIR
) {
1572 * This sysctl determines if we will allow a process to chroot(2) if it
1573 * has a directory open:
1574 * 0: disallowed for all processes.
1575 * 1: allowed for processes that were not already chroot(2)'ed.
1576 * 2: allowed for all processes.
1579 static int chroot_allow_open_directories
= 1;
1581 SYSCTL_INT(_kern
, OID_AUTO
, chroot_allow_open_directories
, CTLFLAG_RW
,
1582 &chroot_allow_open_directories
, 0, "");
1585 * chroot to the specified namecache entry. We obtain the vp from the
1586 * namecache data. The passed ncp must be locked and referenced and will
1587 * remain locked and referenced on return.
1590 kern_chroot(struct nchandle
*nch
)
1592 struct thread
*td
= curthread
;
1593 struct proc
*p
= td
->td_proc
;
1594 struct filedesc
*fdp
= p
->p_fd
;
1599 * Only root can chroot
1601 if ((error
= priv_check_cred(p
->p_ucred
, PRIV_ROOT
, PRISON_ROOT
)) != 0)
1605 * Disallow open directory descriptors (fchdir() breakouts).
1607 if (chroot_allow_open_directories
== 0 ||
1608 (chroot_allow_open_directories
== 1 && fdp
->fd_rdir
!= rootvnode
)) {
1609 if ((error
= chroot_refuse_vdir_fds(fdp
)) != 0)
1612 if ((vp
= nch
->ncp
->nc_vp
) == NULL
)
1615 if ((error
= vget(vp
, LK_SHARED
)) != 0)
1619 * Check the validity of vp as a directory to change to and
1620 * associate it with rdir/jdir.
1622 error
= checkvp_chdir(vp
, td
);
1623 vn_unlock(vp
); /* leave reference intact */
1625 vrele(fdp
->fd_rdir
);
1626 fdp
->fd_rdir
= vp
; /* reference inherited by fd_rdir */
1627 cache_drop(&fdp
->fd_nrdir
);
1628 cache_copy(nch
, &fdp
->fd_nrdir
);
1629 if (fdp
->fd_jdir
== NULL
) {
1632 cache_copy(nch
, &fdp
->fd_njdir
);
1641 * chroot_args(char *path)
1643 * Change notion of root (``/'') directory.
1647 sys_chroot(struct chroot_args
*uap
)
1649 struct thread
*td
= curthread
;
1650 struct nlookupdata nd
;
1653 KKASSERT(td
->td_proc
);
1654 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
1659 error
= nlookup(&nd
);
1661 error
= kern_chroot(&nd
.nl_nch
);
1667 * Common routine for chroot and chdir. Given a locked, referenced vnode,
1668 * determine whether it is legal to chdir to the vnode. The vnode's state
1669 * is not changed by this call.
1672 checkvp_chdir(struct vnode
*vp
, struct thread
*td
)
1676 if (vp
->v_type
!= VDIR
)
1679 error
= VOP_ACCESS(vp
, VEXEC
, td
->td_proc
->p_ucred
);
1684 kern_open(struct nlookupdata
*nd
, int oflags
, int mode
, int *res
)
1686 struct thread
*td
= curthread
;
1687 struct proc
*p
= td
->td_proc
;
1688 struct lwp
*lp
= td
->td_lwp
;
1689 struct filedesc
*fdp
= p
->p_fd
;
1694 int type
, indx
, error
;
1697 if ((oflags
& O_ACCMODE
) == O_ACCMODE
)
1699 flags
= FFLAGS(oflags
);
1700 error
= falloc(p
, &nfp
, NULL
);
1704 cmode
= ((mode
&~ fdp
->fd_cmask
) & ALLPERMS
) &~ S_ISTXT
;
1707 * XXX p_dupfd is a real mess. It allows a device to return a
1708 * file descriptor to be duplicated rather then doing the open
1714 * Call vn_open() to do the lookup and assign the vnode to the
1715 * file pointer. vn_open() does not change the ref count on fp
1716 * and the vnode, on success, will be inherited by the file pointer
1719 nd
->nl_flags
|= NLC_LOCKVP
;
1720 error
= vn_open(nd
, fp
, flags
, cmode
);
1724 * handle special fdopen() case. bleh. dupfdopen() is
1725 * responsible for dropping the old contents of ofiles[indx]
1728 * Note that fsetfd() will add a ref to fp which represents
1729 * the fd_files[] assignment. We must still drop our
1732 if ((error
== ENODEV
|| error
== ENXIO
) && lp
->lwp_dupfd
>= 0) {
1733 if (fdalloc(p
, 0, &indx
) == 0) {
1734 error
= dupfdopen(p
, indx
, lp
->lwp_dupfd
, flags
, error
);
1737 fdrop(fp
); /* our ref */
1740 fsetfd(p
, NULL
, indx
);
1743 fdrop(fp
); /* our ref */
1744 if (error
== ERESTART
)
1750 * ref the vnode for ourselves so it can't be ripped out from under
1751 * is. XXX need an ND flag to request that the vnode be returned
1754 * Reserve a file descriptor but do not assign it until the open
1757 vp
= (struct vnode
*)fp
->f_data
;
1759 if ((error
= fdalloc(p
, 0, &indx
)) != 0) {
1766 * If no error occurs the vp will have been assigned to the file
1771 if (flags
& (O_EXLOCK
| O_SHLOCK
)) {
1772 lf
.l_whence
= SEEK_SET
;
1775 if (flags
& O_EXLOCK
)
1776 lf
.l_type
= F_WRLCK
;
1778 lf
.l_type
= F_RDLCK
;
1779 if (flags
& FNONBLOCK
)
1784 if ((error
= VOP_ADVLOCK(vp
, (caddr_t
)fp
, F_SETLK
, &lf
, type
)) != 0) {
1786 * lock request failed. Clean up the reserved
1790 fsetfd(p
, NULL
, indx
);
1794 fp
->f_flag
|= FHASLOCK
;
1798 * Assert that all regular file vnodes were created with a object.
1800 KASSERT(vp
->v_type
!= VREG
|| vp
->v_object
!= NULL
,
1801 ("open: regular file has no backing object after vn_open"));
1807 * release our private reference, leaving the one associated with the
1808 * descriptor table intact.
1810 fsetfd(p
, fp
, indx
);
1817 * open_args(char *path, int flags, int mode)
1819 * Check permissions, allocate an open file structure,
1820 * and call the device open routine if any.
1823 sys_open(struct open_args
*uap
)
1825 struct nlookupdata nd
;
1828 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
1830 error
= kern_open(&nd
, uap
->flags
,
1831 uap
->mode
, &uap
->sysmsg_result
);
1838 kern_mknod(struct nlookupdata
*nd
, int mode
, int rmajor
, int rminor
)
1840 struct thread
*td
= curthread
;
1841 struct proc
*p
= td
->td_proc
;
1849 switch (mode
& S_IFMT
) {
1852 error
= priv_check(td
, PRIV_ROOT
);
1855 error
= priv_check_cred(p
->p_ucred
, PRIV_ROOT
, PRISON_ROOT
);
1862 nd
->nl_flags
|= NLC_CREATE
| NLC_REFDVP
;
1863 if ((error
= nlookup(nd
)) != 0)
1865 if (nd
->nl_nch
.ncp
->nc_vp
)
1867 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
1871 vattr
.va_mode
= (mode
& ALLPERMS
) &~ p
->p_fd
->fd_cmask
;
1872 vattr
.va_rmajor
= rmajor
;
1873 vattr
.va_rminor
= rminor
;
1876 switch (mode
& S_IFMT
) {
1877 case S_IFMT
: /* used by badsect to flag bad sectors */
1878 vattr
.va_type
= VBAD
;
1881 vattr
.va_type
= VCHR
;
1884 vattr
.va_type
= VBLK
;
1890 /* special directories support for HAMMER */
1891 vattr
.va_type
= VDIR
;
1899 error
= VOP_NWHITEOUT(&nd
->nl_nch
, nd
->nl_dvp
,
1900 nd
->nl_cred
, NAMEI_CREATE
);
1903 error
= VOP_NMKNOD(&nd
->nl_nch
, nd
->nl_dvp
,
1904 &vp
, nd
->nl_cred
, &vattr
);
1913 * mknod_args(char *path, int mode, int dev)
1915 * Create a special file.
1918 sys_mknod(struct mknod_args
*uap
)
1920 struct nlookupdata nd
;
1923 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
1925 error
= kern_mknod(&nd
, uap
->mode
,
1926 umajor(uap
->dev
), uminor(uap
->dev
));
1933 kern_mkfifo(struct nlookupdata
*nd
, int mode
)
1935 struct thread
*td
= curthread
;
1936 struct proc
*p
= td
->td_proc
;
1943 nd
->nl_flags
|= NLC_CREATE
| NLC_REFDVP
;
1944 if ((error
= nlookup(nd
)) != 0)
1946 if (nd
->nl_nch
.ncp
->nc_vp
)
1948 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
1952 vattr
.va_type
= VFIFO
;
1953 vattr
.va_mode
= (mode
& ALLPERMS
) &~ p
->p_fd
->fd_cmask
;
1955 error
= VOP_NMKNOD(&nd
->nl_nch
, nd
->nl_dvp
, &vp
, nd
->nl_cred
, &vattr
);
1962 * mkfifo_args(char *path, int mode)
1964 * Create a named pipe.
1967 sys_mkfifo(struct mkfifo_args
*uap
)
1969 struct nlookupdata nd
;
1972 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
1974 error
= kern_mkfifo(&nd
, uap
->mode
);
1979 static int hardlink_check_uid
= 0;
1980 SYSCTL_INT(_security
, OID_AUTO
, hardlink_check_uid
, CTLFLAG_RW
,
1981 &hardlink_check_uid
, 0,
1982 "Unprivileged processes cannot create hard links to files owned by other "
1984 static int hardlink_check_gid
= 0;
1985 SYSCTL_INT(_security
, OID_AUTO
, hardlink_check_gid
, CTLFLAG_RW
,
1986 &hardlink_check_gid
, 0,
1987 "Unprivileged processes cannot create hard links to files owned by other "
1991 can_hardlink(struct vnode
*vp
, struct thread
*td
, struct ucred
*cred
)
1997 * Shortcut if disabled
1999 if (hardlink_check_uid
== 0 && hardlink_check_gid
== 0)
2003 * root cred can always hardlink
2005 if (priv_check_cred(cred
, PRIV_ROOT
, PRISON_ROOT
) == 0)
2009 * Otherwise only if the originating file is owned by the
2010 * same user or group. Note that any group is allowed if
2011 * the file is owned by the caller.
2013 error
= VOP_GETATTR(vp
, &va
);
2017 if (hardlink_check_uid
) {
2018 if (cred
->cr_uid
!= va
.va_uid
)
2022 if (hardlink_check_gid
) {
2023 if (cred
->cr_uid
!= va
.va_uid
&& !groupmember(va
.va_gid
, cred
))
2031 kern_link(struct nlookupdata
*nd
, struct nlookupdata
*linknd
)
2033 struct thread
*td
= curthread
;
2038 * Lookup the source and obtained a locked vnode.
2040 * XXX relookup on vget failure / race ?
2043 if ((error
= nlookup(nd
)) != 0)
2045 vp
= nd
->nl_nch
.ncp
->nc_vp
;
2046 KKASSERT(vp
!= NULL
);
2047 if (vp
->v_type
== VDIR
)
2048 return (EPERM
); /* POSIX */
2049 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
2051 if ((error
= vget(vp
, LK_EXCLUSIVE
)) != 0)
2055 * Unlock the source so we can lookup the target without deadlocking
2056 * (XXX vp is locked already, possible other deadlock?). The target
2059 KKASSERT(nd
->nl_flags
& NLC_NCPISLOCKED
);
2060 nd
->nl_flags
&= ~NLC_NCPISLOCKED
;
2061 cache_unlock(&nd
->nl_nch
);
2063 linknd
->nl_flags
|= NLC_CREATE
| NLC_REFDVP
;
2064 if ((error
= nlookup(linknd
)) != 0) {
2068 if (linknd
->nl_nch
.ncp
->nc_vp
) {
2074 * Finally run the new API VOP.
2076 error
= can_hardlink(vp
, td
, td
->td_proc
->p_ucred
);
2078 error
= VOP_NLINK(&linknd
->nl_nch
, linknd
->nl_dvp
,
2079 vp
, linknd
->nl_cred
);
2086 * link_args(char *path, char *link)
2088 * Make a hard file link.
2091 sys_link(struct link_args
*uap
)
2093 struct nlookupdata nd
, linknd
;
2096 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
2098 error
= nlookup_init(&linknd
, uap
->link
, UIO_USERSPACE
, 0);
2100 error
= kern_link(&nd
, &linknd
);
2101 nlookup_done(&linknd
);
2108 kern_symlink(struct nlookupdata
*nd
, char *path
, int mode
)
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 vattr
.va_mode
= mode
;
2126 error
= VOP_NSYMLINK(&nd
->nl_nch
, dvp
, &vp
, nd
->nl_cred
, &vattr
, path
);
2133 * symlink(char *path, char *link)
2135 * Make a symbolic link.
2138 sys_symlink(struct symlink_args
*uap
)
2140 struct thread
*td
= curthread
;
2141 struct nlookupdata nd
;
2146 path
= objcache_get(namei_oc
, M_WAITOK
);
2147 error
= copyinstr(uap
->path
, path
, MAXPATHLEN
, NULL
);
2149 error
= nlookup_init(&nd
, uap
->link
, UIO_USERSPACE
, 0);
2151 mode
= ACCESSPERMS
& ~td
->td_proc
->p_fd
->fd_cmask
;
2152 error
= kern_symlink(&nd
, path
, mode
);
2156 objcache_put(namei_oc
, path
);
2161 * undelete_args(char *path)
2163 * Delete a whiteout from the filesystem.
2167 sys_undelete(struct undelete_args
*uap
)
2169 struct nlookupdata nd
;
2172 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2174 nd
.nl_flags
|= NLC_DELETE
| NLC_REFDVP
;
2176 error
= nlookup(&nd
);
2178 error
= ncp_writechk(&nd
.nl_nch
);
2180 error
= VOP_NWHITEOUT(&nd
.nl_nch
, nd
.nl_dvp
, nd
.nl_cred
,
2188 kern_unlink(struct nlookupdata
*nd
)
2193 nd
->nl_flags
|= NLC_DELETE
| NLC_REFDVP
;
2194 if ((error
= nlookup(nd
)) != 0)
2196 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
2198 error
= VOP_NREMOVE(&nd
->nl_nch
, nd
->nl_dvp
, nd
->nl_cred
);
2203 * unlink_args(char *path)
2205 * Delete a name from the filesystem.
2208 sys_unlink(struct unlink_args
*uap
)
2210 struct nlookupdata nd
;
2213 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2215 error
= kern_unlink(&nd
);
2221 kern_lseek(int fd
, off_t offset
, int whence
, off_t
*res
)
2223 struct thread
*td
= curthread
;
2224 struct proc
*p
= td
->td_proc
;
2231 fp
= holdfp(p
->p_fd
, fd
, -1);
2234 if (fp
->f_type
!= DTYPE_VNODE
) {
2238 vp
= (struct vnode
*)fp
->f_data
;
2242 new_offset
= fp
->f_offset
+ offset
;
2246 error
= VOP_GETATTR(vp
, &vattr
);
2247 new_offset
= offset
+ vattr
.va_size
;
2250 new_offset
= offset
;
2260 * Validate the seek position. Negative offsets are not allowed
2261 * for regular files, block specials, or directories.
2264 if (new_offset
< 0 &&
2265 (vp
->v_type
== VREG
|| vp
->v_type
== VDIR
||
2266 vp
->v_type
== VCHR
|| vp
->v_type
== VBLK
)) {
2269 fp
->f_offset
= new_offset
;
2272 *res
= fp
->f_offset
;
2279 * lseek_args(int fd, int pad, off_t offset, int whence)
2281 * Reposition read/write file offset.
2284 sys_lseek(struct lseek_args
*uap
)
2288 error
= kern_lseek(uap
->fd
, uap
->offset
, uap
->whence
,
2289 &uap
->sysmsg_offset
);
2295 kern_access(struct nlookupdata
*nd
, int aflags
)
2300 if ((error
= nlookup(nd
)) != 0)
2303 error
= cache_vget(&nd
->nl_nch
, nd
->nl_cred
, LK_EXCLUSIVE
, &vp
);
2307 /* Flags == 0 means only check for existence. */
2316 if ((flags
& VWRITE
) == 0 ||
2317 (error
= vn_writechk(vp
, &nd
->nl_nch
)) == 0)
2318 error
= VOP_ACCESS(vp
, flags
, nd
->nl_cred
);
2321 * If the file handle is stale we have to re-resolve the
2322 * entry. This is a hack at the moment.
2324 if (error
== ESTALE
) {
2326 cache_setunresolved(&nd
->nl_nch
);
2327 error
= cache_resolve(&nd
->nl_nch
, nd
->nl_cred
);
2340 * access_args(char *path, int flags)
2342 * Check access permissions.
2345 sys_access(struct access_args
*uap
)
2347 struct nlookupdata nd
;
2350 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
2352 error
= kern_access(&nd
, uap
->flags
);
2358 kern_stat(struct nlookupdata
*nd
, struct stat
*st
)
2364 if ((error
= nlookup(nd
)) != 0)
2367 if ((vp
= nd
->nl_nch
.ncp
->nc_vp
) == NULL
)
2371 if ((error
= vget(vp
, LK_SHARED
)) != 0)
2373 error
= vn_stat(vp
, st
, nd
->nl_cred
);
2376 * If the file handle is stale we have to re-resolve the entry. This
2377 * is a hack at the moment.
2379 if (error
== ESTALE
) {
2381 cache_setunresolved(&nd
->nl_nch
);
2382 error
= cache_resolve(&nd
->nl_nch
, nd
->nl_cred
);
2392 * stat_args(char *path, struct stat *ub)
2394 * Get file status; this version follows links.
2397 sys_stat(struct stat_args
*uap
)
2399 struct nlookupdata nd
;
2403 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
2405 error
= kern_stat(&nd
, &st
);
2407 error
= copyout(&st
, uap
->ub
, sizeof(*uap
->ub
));
2414 * lstat_args(char *path, struct stat *ub)
2416 * Get file status; this version does not follow links.
2419 sys_lstat(struct lstat_args
*uap
)
2421 struct nlookupdata nd
;
2425 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2427 error
= kern_stat(&nd
, &st
);
2429 error
= copyout(&st
, uap
->ub
, sizeof(*uap
->ub
));
2436 * pathconf_Args(char *path, int name)
2438 * Get configurable pathname variables.
2442 sys_pathconf(struct pathconf_args
*uap
)
2444 struct nlookupdata nd
;
2449 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
2451 error
= nlookup(&nd
);
2453 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_EXCLUSIVE
, &vp
);
2456 error
= VOP_PATHCONF(vp
, uap
->name
, &uap
->sysmsg_reg
);
2464 * kern_readlink isn't properly split yet. There is a copyin burried
2465 * in VOP_READLINK().
2468 kern_readlink(struct nlookupdata
*nd
, char *buf
, int count
, int *res
)
2470 struct thread
*td
= curthread
;
2471 struct proc
*p
= td
->td_proc
;
2477 if ((error
= nlookup(nd
)) != 0)
2479 error
= cache_vget(&nd
->nl_nch
, nd
->nl_cred
, LK_EXCLUSIVE
, &vp
);
2482 if (vp
->v_type
!= VLNK
) {
2485 aiov
.iov_base
= buf
;
2486 aiov
.iov_len
= count
;
2487 auio
.uio_iov
= &aiov
;
2488 auio
.uio_iovcnt
= 1;
2489 auio
.uio_offset
= 0;
2490 auio
.uio_rw
= UIO_READ
;
2491 auio
.uio_segflg
= UIO_USERSPACE
;
2493 auio
.uio_resid
= count
;
2494 error
= VOP_READLINK(vp
, &auio
, p
->p_ucred
);
2497 *res
= count
- auio
.uio_resid
;
2502 * readlink_args(char *path, char *buf, int count)
2504 * Return target name of a symbolic link.
2507 sys_readlink(struct readlink_args
*uap
)
2509 struct nlookupdata nd
;
2512 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2514 error
= kern_readlink(&nd
, uap
->buf
, uap
->count
,
2515 &uap
->sysmsg_result
);
2522 setfflags(struct vnode
*vp
, int flags
)
2524 struct thread
*td
= curthread
;
2525 struct proc
*p
= td
->td_proc
;
2530 * Prevent non-root users from setting flags on devices. When
2531 * a device is reused, users can retain ownership of the device
2532 * if they are allowed to set flags and programs assume that
2533 * chown can't fail when done as root.
2535 if ((vp
->v_type
== VCHR
|| vp
->v_type
== VBLK
) &&
2536 ((error
= priv_check_cred(p
->p_ucred
, PRIV_ROOT
, PRISON_ROOT
)) != 0))
2540 * note: vget is required for any operation that might mod the vnode
2541 * so VINACTIVE is properly cleared.
2543 if ((error
= vget(vp
, LK_EXCLUSIVE
)) == 0) {
2545 vattr
.va_flags
= flags
;
2546 error
= VOP_SETATTR(vp
, &vattr
, p
->p_ucred
);
2553 * chflags(char *path, int flags)
2555 * Change flags of a file given a path name.
2559 sys_chflags(struct chflags_args
*uap
)
2561 struct nlookupdata nd
;
2566 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
2567 /* XXX Add NLC flag indicating modifying operation? */
2569 error
= nlookup(&nd
);
2571 error
= ncp_writechk(&nd
.nl_nch
);
2573 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
2576 error
= setfflags(vp
, uap
->flags
);
2583 * lchflags(char *path, int flags)
2585 * Change flags of a file given a path name, but don't follow symlinks.
2589 sys_lchflags(struct lchflags_args
*uap
)
2591 struct nlookupdata nd
;
2596 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2597 /* XXX Add NLC flag indicating modifying operation? */
2599 error
= nlookup(&nd
);
2601 error
= ncp_writechk(&nd
.nl_nch
);
2603 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
2606 error
= setfflags(vp
, uap
->flags
);
2613 * fchflags_args(int fd, int flags)
2615 * Change flags of a file given a file descriptor.
2619 sys_fchflags(struct fchflags_args
*uap
)
2621 struct thread
*td
= curthread
;
2622 struct proc
*p
= td
->td_proc
;
2626 if ((error
= holdvnode(p
->p_fd
, uap
->fd
, &fp
)) != 0)
2628 if (fp
->f_nchandle
.ncp
)
2629 error
= ncp_writechk(&fp
->f_nchandle
);
2631 error
= setfflags((struct vnode
*) fp
->f_data
, uap
->flags
);
2637 setfmode(struct vnode
*vp
, int mode
)
2639 struct thread
*td
= curthread
;
2640 struct proc
*p
= td
->td_proc
;
2645 * note: vget is required for any operation that might mod the vnode
2646 * so VINACTIVE is properly cleared.
2648 if ((error
= vget(vp
, LK_EXCLUSIVE
)) == 0) {
2650 vattr
.va_mode
= mode
& ALLPERMS
;
2651 error
= VOP_SETATTR(vp
, &vattr
, p
->p_ucred
);
2658 kern_chmod(struct nlookupdata
*nd
, int mode
)
2663 /* XXX Add NLC flag indicating modifying operation? */
2664 if ((error
= nlookup(nd
)) != 0)
2666 if ((error
= cache_vref(&nd
->nl_nch
, nd
->nl_cred
, &vp
)) != 0)
2668 if ((error
= ncp_writechk(&nd
->nl_nch
)) == 0)
2669 error
= setfmode(vp
, mode
);
2675 * chmod_args(char *path, int mode)
2677 * Change mode of a file given path name.
2681 sys_chmod(struct chmod_args
*uap
)
2683 struct nlookupdata nd
;
2686 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
2688 error
= kern_chmod(&nd
, uap
->mode
);
2694 * lchmod_args(char *path, int mode)
2696 * Change mode of a file given path name (don't follow links.)
2700 sys_lchmod(struct lchmod_args
*uap
)
2702 struct nlookupdata nd
;
2705 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2707 error
= kern_chmod(&nd
, uap
->mode
);
2713 * fchmod_args(int fd, int mode)
2715 * Change mode of a file given a file descriptor.
2719 sys_fchmod(struct fchmod_args
*uap
)
2721 struct thread
*td
= curthread
;
2722 struct proc
*p
= td
->td_proc
;
2726 if ((error
= holdvnode(p
->p_fd
, uap
->fd
, &fp
)) != 0)
2728 if (fp
->f_nchandle
.ncp
)
2729 error
= ncp_writechk(&fp
->f_nchandle
);
2731 error
= setfmode((struct vnode
*)fp
->f_data
, uap
->mode
);
2737 setfown(struct vnode
*vp
, uid_t uid
, gid_t gid
)
2739 struct thread
*td
= curthread
;
2740 struct proc
*p
= td
->td_proc
;
2745 * note: vget is required for any operation that might mod the vnode
2746 * so VINACTIVE is properly cleared.
2748 if ((error
= vget(vp
, LK_EXCLUSIVE
)) == 0) {
2752 error
= VOP_SETATTR(vp
, &vattr
, p
->p_ucred
);
2759 kern_chown(struct nlookupdata
*nd
, int uid
, int gid
)
2764 /* XXX Add NLC flag indicating modifying operation? */
2765 if ((error
= nlookup(nd
)) != 0)
2767 if ((error
= cache_vref(&nd
->nl_nch
, nd
->nl_cred
, &vp
)) != 0)
2769 if ((error
= ncp_writechk(&nd
->nl_nch
)) == 0)
2770 error
= setfown(vp
, uid
, gid
);
2776 * chown(char *path, int uid, int gid)
2778 * Set ownership given a path name.
2781 sys_chown(struct chown_args
*uap
)
2783 struct nlookupdata nd
;
2786 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
2788 error
= kern_chown(&nd
, uap
->uid
, uap
->gid
);
2794 * lchown_args(char *path, int uid, int gid)
2796 * Set ownership given a path name, do not cross symlinks.
2799 sys_lchown(struct lchown_args
*uap
)
2801 struct nlookupdata nd
;
2804 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2806 error
= kern_chown(&nd
, uap
->uid
, uap
->gid
);
2812 * fchown_args(int fd, int uid, int gid)
2814 * Set ownership given a file descriptor.
2818 sys_fchown(struct fchown_args
*uap
)
2820 struct thread
*td
= curthread
;
2821 struct proc
*p
= td
->td_proc
;
2825 if ((error
= holdvnode(p
->p_fd
, uap
->fd
, &fp
)) != 0)
2827 if (fp
->f_nchandle
.ncp
)
2828 error
= ncp_writechk(&fp
->f_nchandle
);
2830 error
= setfown((struct vnode
*)fp
->f_data
, uap
->uid
, uap
->gid
);
2836 getutimes(const struct timeval
*tvp
, struct timespec
*tsp
)
2838 struct timeval tv
[2];
2842 TIMEVAL_TO_TIMESPEC(&tv
[0], &tsp
[0]);
2845 TIMEVAL_TO_TIMESPEC(&tvp
[0], &tsp
[0]);
2846 TIMEVAL_TO_TIMESPEC(&tvp
[1], &tsp
[1]);
2852 setutimes(struct vnode
*vp
, const struct timespec
*ts
, int nullflag
)
2854 struct thread
*td
= curthread
;
2855 struct proc
*p
= td
->td_proc
;
2860 * note: vget is required for any operation that might mod the vnode
2861 * so VINACTIVE is properly cleared.
2863 if ((error
= vget(vp
, LK_EXCLUSIVE
)) == 0) {
2865 vattr
.va_atime
= ts
[0];
2866 vattr
.va_mtime
= ts
[1];
2868 vattr
.va_vaflags
|= VA_UTIMES_NULL
;
2869 error
= VOP_SETATTR(vp
, &vattr
, p
->p_ucred
);
2876 kern_utimes(struct nlookupdata
*nd
, struct timeval
*tptr
)
2878 struct timespec ts
[2];
2882 if ((error
= getutimes(tptr
, ts
)) != 0)
2884 /* XXX Add NLC flag indicating modifying operation? */
2885 if ((error
= nlookup(nd
)) != 0)
2887 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
2889 if ((error
= cache_vref(&nd
->nl_nch
, nd
->nl_cred
, &vp
)) != 0)
2893 * NOTE: utimes() succeeds for the owner even if the file
2894 * is not user-writable.
2896 if ((error
= vn_writechk(vp
, &nd
->nl_nch
)) == 0 &&
2897 (error
= VOP_ACCESS(vp
, VWRITE
| VOWN
, nd
->nl_cred
)) == 0) {
2898 error
= setutimes(vp
, ts
, tptr
== NULL
);
2905 * utimes_args(char *path, struct timeval *tptr)
2907 * Set the access and modification times of a file.
2910 sys_utimes(struct utimes_args
*uap
)
2912 struct timeval tv
[2];
2913 struct nlookupdata nd
;
2917 error
= copyin(uap
->tptr
, tv
, sizeof(tv
));
2921 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
2923 error
= kern_utimes(&nd
, uap
->tptr
? tv
: NULL
);
2929 * lutimes_args(char *path, struct timeval *tptr)
2931 * Set the access and modification times of a file.
2934 sys_lutimes(struct lutimes_args
*uap
)
2936 struct timeval tv
[2];
2937 struct nlookupdata nd
;
2941 error
= copyin(uap
->tptr
, tv
, sizeof(tv
));
2945 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2947 error
= kern_utimes(&nd
, uap
->tptr
? tv
: NULL
);
2953 kern_futimes(int fd
, struct timeval
*tptr
)
2955 struct thread
*td
= curthread
;
2956 struct proc
*p
= td
->td_proc
;
2957 struct timespec ts
[2];
2961 error
= getutimes(tptr
, ts
);
2964 if ((error
= holdvnode(p
->p_fd
, fd
, &fp
)) != 0)
2966 if (fp
->f_nchandle
.ncp
)
2967 error
= ncp_writechk(&fp
->f_nchandle
);
2969 error
= setutimes((struct vnode
*)fp
->f_data
, ts
, tptr
== NULL
);
2975 * futimes_args(int fd, struct timeval *tptr)
2977 * Set the access and modification times of a file.
2980 sys_futimes(struct futimes_args
*uap
)
2982 struct timeval tv
[2];
2986 error
= copyin(uap
->tptr
, tv
, sizeof(tv
));
2991 error
= kern_futimes(uap
->fd
, uap
->tptr
? tv
: NULL
);
2997 kern_truncate(struct nlookupdata
*nd
, off_t length
)
3005 /* XXX Add NLC flag indicating modifying operation? */
3006 if ((error
= nlookup(nd
)) != 0)
3008 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
3010 if ((error
= cache_vref(&nd
->nl_nch
, nd
->nl_cred
, &vp
)) != 0)
3012 if ((error
= vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
)) != 0) {
3016 if (vp
->v_type
== VDIR
) {
3018 } else if ((error
= vn_writechk(vp
, &nd
->nl_nch
)) == 0 &&
3019 (error
= VOP_ACCESS(vp
, VWRITE
, nd
->nl_cred
)) == 0) {
3021 vattr
.va_size
= length
;
3022 error
= VOP_SETATTR(vp
, &vattr
, nd
->nl_cred
);
3029 * truncate(char *path, int pad, off_t length)
3031 * Truncate a file given its path name.
3034 sys_truncate(struct truncate_args
*uap
)
3036 struct nlookupdata nd
;
3039 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
3041 error
= kern_truncate(&nd
, uap
->length
);
3047 kern_ftruncate(int fd
, off_t length
)
3049 struct thread
*td
= curthread
;
3050 struct proc
*p
= td
->td_proc
;
3058 if ((error
= holdvnode(p
->p_fd
, fd
, &fp
)) != 0)
3060 if (fp
->f_nchandle
.ncp
) {
3061 error
= ncp_writechk(&fp
->f_nchandle
);
3065 if ((fp
->f_flag
& FWRITE
) == 0) {
3069 vp
= (struct vnode
*)fp
->f_data
;
3070 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
3071 if (vp
->v_type
== VDIR
) {
3073 } else if ((error
= vn_writechk(vp
, NULL
)) == 0) {
3075 vattr
.va_size
= length
;
3076 error
= VOP_SETATTR(vp
, &vattr
, fp
->f_cred
);
3085 * ftruncate_args(int fd, int pad, off_t length)
3087 * Truncate a file given a file descriptor.
3090 sys_ftruncate(struct ftruncate_args
*uap
)
3094 error
= kern_ftruncate(uap
->fd
, uap
->length
);
3102 * Sync an open file.
3106 sys_fsync(struct fsync_args
*uap
)
3108 struct thread
*td
= curthread
;
3109 struct proc
*p
= td
->td_proc
;
3115 if ((error
= holdvnode(p
->p_fd
, uap
->fd
, &fp
)) != 0)
3117 vp
= (struct vnode
*)fp
->f_data
;
3118 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
3119 if ((obj
= vp
->v_object
) != NULL
)
3120 vm_object_page_clean(obj
, 0, 0, 0);
3121 if ((error
= VOP_FSYNC(vp
, MNT_WAIT
)) == 0 && vp
->v_mount
)
3122 error
= buf_fsync(vp
);
3129 kern_rename(struct nlookupdata
*fromnd
, struct nlookupdata
*tond
)
3131 struct nchandle fnchd
;
3132 struct nchandle tnchd
;
3133 struct namecache
*ncp
;
3140 fromnd
->nl_flags
|= NLC_REFDVP
;
3141 if ((error
= nlookup(fromnd
)) != 0)
3143 if ((fnchd
.ncp
= fromnd
->nl_nch
.ncp
->nc_parent
) == NULL
)
3145 fnchd
.mount
= fromnd
->nl_nch
.mount
;
3149 * unlock the source nch so we can lookup the target nch without
3150 * deadlocking. The target may or may not exist so we do not check
3151 * for a target vp like kern_mkdir() and other creation functions do.
3153 * The source and target directories are ref'd and rechecked after
3154 * everything is relocked to determine if the source or target file
3157 KKASSERT(fromnd
->nl_flags
& NLC_NCPISLOCKED
);
3158 fromnd
->nl_flags
&= ~NLC_NCPISLOCKED
;
3159 cache_unlock(&fromnd
->nl_nch
);
3161 tond
->nl_flags
|= NLC_CREATE
| NLC_REFDVP
;
3162 if ((error
= nlookup(tond
)) != 0) {
3166 if ((tnchd
.ncp
= tond
->nl_nch
.ncp
->nc_parent
) == NULL
) {
3170 tnchd
.mount
= tond
->nl_nch
.mount
;
3174 * If the source and target are the same there is nothing to do
3176 if (fromnd
->nl_nch
.ncp
== tond
->nl_nch
.ncp
) {
3183 * Mount points cannot be renamed or overwritten
3185 if ((fromnd
->nl_nch
.ncp
->nc_flag
| tond
->nl_nch
.ncp
->nc_flag
) &
3194 * relock the source ncp. NOTE AFTER RELOCKING: the source ncp
3195 * may have become invalid while it was unlocked, nc_vp and nc_mount
3198 if (cache_lock_nonblock(&fromnd
->nl_nch
) == 0) {
3199 cache_resolve(&fromnd
->nl_nch
, fromnd
->nl_cred
);
3200 } else if (fromnd
->nl_nch
.ncp
> tond
->nl_nch
.ncp
) {
3201 cache_lock(&fromnd
->nl_nch
);
3202 cache_resolve(&fromnd
->nl_nch
, fromnd
->nl_cred
);
3204 cache_unlock(&tond
->nl_nch
);
3205 cache_lock(&fromnd
->nl_nch
);
3206 cache_resolve(&fromnd
->nl_nch
, fromnd
->nl_cred
);
3207 cache_lock(&tond
->nl_nch
);
3208 cache_resolve(&tond
->nl_nch
, tond
->nl_cred
);
3210 fromnd
->nl_flags
|= NLC_NCPISLOCKED
;
3213 * make sure the parent directories linkages are the same
3215 if (fnchd
.ncp
!= fromnd
->nl_nch
.ncp
->nc_parent
||
3216 tnchd
.ncp
!= tond
->nl_nch
.ncp
->nc_parent
) {
3223 * Both the source and target must be within the same filesystem and
3224 * in the same filesystem as their parent directories within the
3225 * namecache topology.
3227 * NOTE: fromnd's nc_mount or nc_vp could be NULL.
3230 if (mp
!= tnchd
.mount
|| mp
!= fromnd
->nl_nch
.mount
||
3231 mp
!= tond
->nl_nch
.mount
) {
3238 * Make sure the mount point is writable
3240 if ((error
= ncp_writechk(&tond
->nl_nch
)) != 0) {
3247 * If the target exists and either the source or target is a directory,
3248 * then both must be directories.
3250 * Due to relocking of the source, fromnd->nl_nch.ncp->nc_vp might h
3253 if (tond
->nl_nch
.ncp
->nc_vp
) {
3254 if (fromnd
->nl_nch
.ncp
->nc_vp
== NULL
) {
3256 } else if (fromnd
->nl_nch
.ncp
->nc_vp
->v_type
== VDIR
) {
3257 if (tond
->nl_nch
.ncp
->nc_vp
->v_type
!= VDIR
)
3259 } else if (tond
->nl_nch
.ncp
->nc_vp
->v_type
== VDIR
) {
3265 * You cannot rename a source into itself or a subdirectory of itself.
3266 * We check this by travsersing the target directory upwards looking
3267 * for a match against the source.
3270 for (ncp
= tnchd
.ncp
; ncp
; ncp
= ncp
->nc_parent
) {
3271 if (fromnd
->nl_nch
.ncp
== ncp
) {
3282 * Even though the namespaces are different, they may still represent
3283 * hardlinks to the same file. The filesystem might have a hard time
3284 * with this so we issue a NREMOVE of the source instead of a NRENAME
3285 * when we detect the situation.
3288 fdvp
= fromnd
->nl_dvp
;
3289 tdvp
= tond
->nl_dvp
;
3290 if (fdvp
== NULL
|| tdvp
== NULL
) {
3292 } else if (fromnd
->nl_nch
.ncp
->nc_vp
== tond
->nl_nch
.ncp
->nc_vp
) {
3293 error
= VOP_NREMOVE(&fromnd
->nl_nch
, fdvp
,
3296 error
= VOP_NRENAME(&fromnd
->nl_nch
, &tond
->nl_nch
,
3297 fdvp
, tdvp
, tond
->nl_cred
);
3304 * rename_args(char *from, char *to)
3306 * Rename files. Source and destination must either both be directories,
3307 * or both not be directories. If target is a directory, it must be empty.
3310 sys_rename(struct rename_args
*uap
)
3312 struct nlookupdata fromnd
, tond
;
3315 error
= nlookup_init(&fromnd
, uap
->from
, UIO_USERSPACE
, 0);
3317 error
= nlookup_init(&tond
, uap
->to
, UIO_USERSPACE
, 0);
3319 error
= kern_rename(&fromnd
, &tond
);
3320 nlookup_done(&tond
);
3322 nlookup_done(&fromnd
);
3327 kern_mkdir(struct nlookupdata
*nd
, int mode
)
3329 struct thread
*td
= curthread
;
3330 struct proc
*p
= td
->td_proc
;
3336 nd
->nl_flags
|= NLC_WILLBEDIR
| NLC_CREATE
| NLC_REFDVP
;
3337 if ((error
= nlookup(nd
)) != 0)
3340 if (nd
->nl_nch
.ncp
->nc_vp
)
3342 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
3345 vattr
.va_type
= VDIR
;
3346 vattr
.va_mode
= (mode
& ACCESSPERMS
) &~ p
->p_fd
->fd_cmask
;
3349 error
= VOP_NMKDIR(&nd
->nl_nch
, nd
->nl_dvp
, &vp
, p
->p_ucred
, &vattr
);
3356 * mkdir_args(char *path, int mode)
3358 * Make a directory file.
3362 sys_mkdir(struct mkdir_args
*uap
)
3364 struct nlookupdata nd
;
3367 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
3369 error
= kern_mkdir(&nd
, uap
->mode
);
3375 kern_rmdir(struct nlookupdata
*nd
)
3380 nd
->nl_flags
|= NLC_DELETE
| NLC_REFDVP
;
3381 if ((error
= nlookup(nd
)) != 0)
3385 * Do not allow directories representing mount points to be
3386 * deleted, even if empty. Check write perms on mount point
3387 * in case the vnode is aliased (aka nullfs).
3389 if (nd
->nl_nch
.ncp
->nc_flag
& (NCF_ISMOUNTPT
))
3391 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
3393 error
= VOP_NRMDIR(&nd
->nl_nch
, nd
->nl_dvp
, nd
->nl_cred
);
3398 * rmdir_args(char *path)
3400 * Remove a directory file.
3404 sys_rmdir(struct rmdir_args
*uap
)
3406 struct nlookupdata nd
;
3409 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
3411 error
= kern_rmdir(&nd
);
3417 kern_getdirentries(int fd
, char *buf
, u_int count
, long *basep
, int *res
,
3418 enum uio_seg direction
)
3420 struct thread
*td
= curthread
;
3421 struct proc
*p
= td
->td_proc
;
3429 if ((error
= holdvnode(p
->p_fd
, fd
, &fp
)) != 0)
3431 if ((fp
->f_flag
& FREAD
) == 0) {
3435 vp
= (struct vnode
*)fp
->f_data
;
3437 if (vp
->v_type
!= VDIR
) {
3441 aiov
.iov_base
= buf
;
3442 aiov
.iov_len
= count
;
3443 auio
.uio_iov
= &aiov
;
3444 auio
.uio_iovcnt
= 1;
3445 auio
.uio_rw
= UIO_READ
;
3446 auio
.uio_segflg
= direction
;
3448 auio
.uio_resid
= count
;
3449 loff
= auio
.uio_offset
= fp
->f_offset
;
3450 error
= VOP_READDIR(vp
, &auio
, fp
->f_cred
, &eofflag
, NULL
, NULL
);
3451 fp
->f_offset
= auio
.uio_offset
;
3454 if (count
== auio
.uio_resid
) {
3455 if (union_dircheckp
) {
3456 error
= union_dircheckp(td
, &vp
, fp
);
3463 if ((vp
->v_flag
& VROOT
) &&
3464 (vp
->v_mount
->mnt_flag
& MNT_UNION
)) {
3465 struct vnode
*tvp
= vp
;
3466 vp
= vp
->v_mount
->mnt_vnodecovered
;
3477 * WARNING! *basep may not be wide enough to accomodate the
3478 * seek offset. XXX should we hack this to return the upper 32 bits
3479 * for offsets greater then 4G?
3482 *basep
= (long)loff
;
3484 *res
= count
- auio
.uio_resid
;
3491 * getdirentries_args(int fd, char *buf, u_int conut, long *basep)
3493 * Read a block of directory entries in a file system independent format.
3496 sys_getdirentries(struct getdirentries_args
*uap
)
3501 error
= kern_getdirentries(uap
->fd
, uap
->buf
, uap
->count
, &base
,
3502 &uap
->sysmsg_result
, UIO_USERSPACE
);
3504 if (error
== 0 && uap
->basep
)
3505 error
= copyout(&base
, uap
->basep
, sizeof(*uap
->basep
));
3510 * getdents_args(int fd, char *buf, size_t count)
3513 sys_getdents(struct getdents_args
*uap
)
3517 error
= kern_getdirentries(uap
->fd
, uap
->buf
, uap
->count
, NULL
,
3518 &uap
->sysmsg_result
, UIO_USERSPACE
);
3524 * umask(int newmask)
3526 * Set the mode mask for creation of filesystem nodes.
3531 sys_umask(struct umask_args
*uap
)
3533 struct thread
*td
= curthread
;
3534 struct proc
*p
= td
->td_proc
;
3535 struct filedesc
*fdp
;
3538 uap
->sysmsg_result
= fdp
->fd_cmask
;
3539 fdp
->fd_cmask
= uap
->newmask
& ALLPERMS
;
3544 * revoke(char *path)
3546 * Void all references to file by ripping underlying filesystem
3551 sys_revoke(struct revoke_args
*uap
)
3553 struct nlookupdata nd
;
3560 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
3562 error
= nlookup(&nd
);
3564 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
3565 cred
= crhold(nd
.nl_cred
);
3569 error
= VOP_GETATTR(vp
, &vattr
);
3570 if (error
== 0 && cred
->cr_uid
!= vattr
.va_uid
)
3571 error
= priv_check_cred(cred
, PRIV_ROOT
, PRISON_ROOT
);
3572 if (error
== 0 && (vp
->v_type
== VCHR
|| vp
->v_type
== VBLK
)) {
3573 if (count_udev(vp
->v_umajor
, vp
->v_uminor
) > 0)
3574 error
= vrevoke(vp
, cred
);
3575 } else if (error
== 0) {
3576 error
= vrevoke(vp
, cred
);
3586 * getfh_args(char *fname, fhandle_t *fhp)
3588 * Get (NFS) file handle
3590 * NOTE: We use the fsid of the covering mount, even if it is a nullfs
3591 * mount. This allows nullfs mounts to be explicitly exported.
3593 * WARNING: nullfs mounts of HAMMER PFS ROOTs are safe.
3595 * nullfs mounts of subdirectories are not safe. That is, it will
3596 * work, but you do not really have protection against access to
3597 * the related parent directories.
3600 sys_getfh(struct getfh_args
*uap
)
3602 struct thread
*td
= curthread
;
3603 struct nlookupdata nd
;
3610 * Must be super user
3612 if ((error
= priv_check(td
, PRIV_ROOT
)) != 0)
3616 error
= nlookup_init(&nd
, uap
->fname
, UIO_USERSPACE
, NLC_FOLLOW
);
3618 error
= nlookup(&nd
);
3620 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_EXCLUSIVE
, &vp
);
3621 mp
= nd
.nl_nch
.mount
;
3624 bzero(&fh
, sizeof(fh
));
3625 fh
.fh_fsid
= mp
->mnt_stat
.f_fsid
;
3626 error
= VFS_VPTOFH(vp
, &fh
.fh_fid
);
3629 error
= copyout(&fh
, uap
->fhp
, sizeof(fh
));
3635 * fhopen_args(const struct fhandle *u_fhp, int flags)
3637 * syscall for the rpc.lockd to use to translate a NFS file handle into
3638 * an open descriptor.
3640 * warning: do not remove the priv_check() call or this becomes one giant
3644 sys_fhopen(struct fhopen_args
*uap
)
3646 struct thread
*td
= curthread
;
3647 struct proc
*p
= td
->td_proc
;
3652 struct vattr
*vap
= &vat
;
3654 int fmode
, mode
, error
, type
;
3660 * Must be super user
3662 error
= priv_check(td
, PRIV_ROOT
);
3666 fmode
= FFLAGS(uap
->flags
);
3667 /* why not allow a non-read/write open for our lockd? */
3668 if (((fmode
& (FREAD
| FWRITE
)) == 0) || (fmode
& O_CREAT
))
3670 error
= copyin(uap
->u_fhp
, &fhp
, sizeof(fhp
));
3673 /* find the mount point */
3674 mp
= vfs_getvfs(&fhp
.fh_fsid
);
3677 /* now give me my vnode, it gets returned to me locked */
3678 error
= VFS_FHTOVP(mp
, NULL
, &fhp
.fh_fid
, &vp
);
3682 * from now on we have to make sure not
3683 * to forget about the vnode
3684 * any error that causes an abort must vput(vp)
3685 * just set error = err and 'goto bad;'.
3691 if (vp
->v_type
== VLNK
) {
3695 if (vp
->v_type
== VSOCK
) {
3700 if (fmode
& (FWRITE
| O_TRUNC
)) {
3701 if (vp
->v_type
== VDIR
) {
3705 error
= vn_writechk(vp
, NULL
);
3713 error
= VOP_ACCESS(vp
, mode
, p
->p_ucred
);
3717 if (fmode
& O_TRUNC
) {
3718 vn_unlock(vp
); /* XXX */
3719 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
); /* XXX */
3722 error
= VOP_SETATTR(vp
, vap
, p
->p_ucred
);
3728 * VOP_OPEN needs the file pointer so it can potentially override
3731 * WARNING! no f_nchandle will be associated when fhopen()ing a
3734 if ((error
= falloc(p
, &nfp
, &indx
)) != 0)
3738 error
= VOP_OPEN(vp
, fmode
, p
->p_ucred
, fp
);
3741 * setting f_ops this way prevents VOP_CLOSE from being
3742 * called or fdrop() releasing the vp from v_data. Since
3743 * the VOP_OPEN failed we don't want to VOP_CLOSE.
3745 fp
->f_ops
= &badfileops
;
3751 * The fp is given its own reference, we still have our ref and lock.
3753 * Assert that all regular files must be created with a VM object.
3755 if (vp
->v_type
== VREG
&& vp
->v_object
== NULL
) {
3756 kprintf("fhopen: regular file did not have VM object: %p\n", vp
);
3761 * The open was successful. Handle any locking requirements.
3763 if (fmode
& (O_EXLOCK
| O_SHLOCK
)) {
3764 lf
.l_whence
= SEEK_SET
;
3767 if (fmode
& O_EXLOCK
)
3768 lf
.l_type
= F_WRLCK
;
3770 lf
.l_type
= F_RDLCK
;
3771 if (fmode
& FNONBLOCK
)
3776 if ((error
= VOP_ADVLOCK(vp
, (caddr_t
)fp
, F_SETLK
, &lf
, type
)) != 0) {
3778 * release our private reference.
3780 fsetfd(p
, NULL
, indx
);
3785 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
3786 fp
->f_flag
|= FHASLOCK
;
3790 * Clean up. Associate the file pointer with the previously
3791 * reserved descriptor and return it.
3794 fsetfd(p
, fp
, indx
);
3796 uap
->sysmsg_result
= indx
;
3800 fsetfd(p
, NULL
, indx
);
3808 * fhstat_args(struct fhandle *u_fhp, struct stat *sb)
3811 sys_fhstat(struct fhstat_args
*uap
)
3813 struct thread
*td
= curthread
;
3821 * Must be super user
3823 error
= priv_check(td
, PRIV_ROOT
);
3827 error
= copyin(uap
->u_fhp
, &fh
, sizeof(fhandle_t
));
3831 if ((mp
= vfs_getvfs(&fh
.fh_fsid
)) == NULL
)
3833 if ((error
= VFS_FHTOVP(mp
, NULL
, &fh
.fh_fid
, &vp
)))
3835 error
= vn_stat(vp
, &sb
, td
->td_proc
->p_ucred
);
3839 error
= copyout(&sb
, uap
->sb
, sizeof(sb
));
3844 * fhstatfs_args(struct fhandle *u_fhp, struct statfs *buf)
3847 sys_fhstatfs(struct fhstatfs_args
*uap
)
3849 struct thread
*td
= curthread
;
3850 struct proc
*p
= td
->td_proc
;
3855 char *fullpath
, *freepath
;
3860 * Must be super user
3862 if ((error
= priv_check(td
, PRIV_ROOT
)))
3865 if ((error
= copyin(uap
->u_fhp
, &fh
, sizeof(fhandle_t
))) != 0)
3868 if ((mp
= vfs_getvfs(&fh
.fh_fsid
)) == NULL
)
3871 if (p
!= NULL
&& !chroot_visible_mnt(mp
, p
))
3874 if ((error
= VFS_FHTOVP(mp
, NULL
, &fh
.fh_fid
, &vp
)))
3879 if ((error
= VFS_STATFS(mp
, sp
, p
->p_ucred
)) != 0)
3882 error
= mount_path(p
, mp
, &fullpath
, &freepath
);
3885 bzero(sp
->f_mntonname
, sizeof(sp
->f_mntonname
));
3886 strlcpy(sp
->f_mntonname
, fullpath
, sizeof(sp
->f_mntonname
));
3887 kfree(freepath
, M_TEMP
);
3889 sp
->f_flags
= mp
->mnt_flag
& MNT_VISFLAGMASK
;
3890 if (priv_check(td
, PRIV_ROOT
)) {
3891 bcopy(sp
, &sb
, sizeof(sb
));
3892 sb
.f_fsid
.val
[0] = sb
.f_fsid
.val
[1] = 0;
3895 return (copyout(sp
, uap
->buf
, sizeof(*sp
)));
3899 * fhstatvfs_args(struct fhandle *u_fhp, struct statvfs *buf)
3902 sys_fhstatvfs(struct fhstatvfs_args
*uap
)
3904 struct thread
*td
= curthread
;
3905 struct proc
*p
= td
->td_proc
;
3913 * Must be super user
3915 if ((error
= priv_check(td
, PRIV_ROOT
)))
3918 if ((error
= copyin(uap
->u_fhp
, &fh
, sizeof(fhandle_t
))) != 0)
3921 if ((mp
= vfs_getvfs(&fh
.fh_fsid
)) == NULL
)
3924 if (p
!= NULL
&& !chroot_visible_mnt(mp
, p
))
3927 if ((error
= VFS_FHTOVP(mp
, NULL
, &fh
.fh_fid
, &vp
)))
3930 sp
= &mp
->mnt_vstat
;
3932 if ((error
= VFS_STATVFS(mp
, sp
, p
->p_ucred
)) != 0)
3936 if (mp
->mnt_flag
& MNT_RDONLY
)
3937 sp
->f_flag
|= ST_RDONLY
;
3938 if (mp
->mnt_flag
& MNT_NOSUID
)
3939 sp
->f_flag
|= ST_NOSUID
;
3941 return (copyout(sp
, uap
->buf
, sizeof(*sp
)));
3946 * Syscall to push extended attribute configuration information into the
3947 * VFS. Accepts a path, which it converts to a mountpoint, as well as
3948 * a command (int cmd), and attribute name and misc data. For now, the
3949 * attribute name is left in userspace for consumption by the VFS_op.
3950 * It will probably be changed to be copied into sysspace by the
3951 * syscall in the future, once issues with various consumers of the
3952 * attribute code have raised their hands.
3954 * Currently this is used only by UFS Extended Attributes.
3957 sys_extattrctl(struct extattrctl_args
*uap
)
3959 struct nlookupdata nd
;
3965 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
3967 error
= nlookup(&nd
);
3969 mp
= nd
.nl_nch
.mount
;
3970 error
= VFS_EXTATTRCTL(mp
, uap
->cmd
,
3971 uap
->attrname
, uap
->arg
,
3979 * Syscall to set a named extended attribute on a file or directory.
3980 * Accepts attribute name, and a uio structure pointing to the data to set.
3981 * The uio is consumed in the style of writev(). The real work happens
3982 * in VOP_SETEXTATTR().
3985 sys_extattr_set_file(struct extattr_set_file_args
*uap
)
3987 char attrname
[EXTATTR_MAXNAMELEN
];
3988 struct iovec aiov
[UIO_SMALLIOV
];
3989 struct iovec
*needfree
;
3990 struct nlookupdata nd
;
3999 error
= copyin(uap
->attrname
, attrname
, EXTATTR_MAXNAMELEN
);
4004 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
4006 error
= nlookup(&nd
);
4008 error
= ncp_writechk(&nd
.nl_nch
);
4010 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_EXCLUSIVE
, &vp
);
4017 iovlen
= uap
->iovcnt
* sizeof(struct iovec
);
4018 if (uap
->iovcnt
> UIO_SMALLIOV
) {
4019 if (uap
->iovcnt
> UIO_MAXIOV
) {
4023 MALLOC(iov
, struct iovec
*, iovlen
, M_IOV
, M_WAITOK
);
4029 auio
.uio_iovcnt
= uap
->iovcnt
;
4030 auio
.uio_rw
= UIO_WRITE
;
4031 auio
.uio_segflg
= UIO_USERSPACE
;
4032 auio
.uio_td
= nd
.nl_td
;
4033 auio
.uio_offset
= 0;
4034 if ((error
= copyin(uap
->iovp
, iov
, iovlen
)))
4037 for (i
= 0; i
< uap
->iovcnt
; i
++) {
4038 if (iov
->iov_len
> INT_MAX
- auio
.uio_resid
) {
4042 auio
.uio_resid
+= iov
->iov_len
;
4045 cnt
= auio
.uio_resid
;
4046 error
= VOP_SETEXTATTR(vp
, attrname
, &auio
, nd
.nl_cred
);
4047 cnt
-= auio
.uio_resid
;
4048 uap
->sysmsg_result
= cnt
;
4053 FREE(needfree
, M_IOV
);
4058 * Syscall to get a named extended attribute on a file or directory.
4059 * Accepts attribute name, and a uio structure pointing to a buffer for the
4060 * data. The uio is consumed in the style of readv(). The real work
4061 * happens in VOP_GETEXTATTR();
4064 sys_extattr_get_file(struct extattr_get_file_args
*uap
)
4066 char attrname
[EXTATTR_MAXNAMELEN
];
4067 struct iovec aiov
[UIO_SMALLIOV
];
4068 struct iovec
*needfree
;
4069 struct nlookupdata nd
;
4078 error
= copyin(uap
->attrname
, attrname
, EXTATTR_MAXNAMELEN
);
4083 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
4085 error
= nlookup(&nd
);
4087 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_EXCLUSIVE
, &vp
);
4093 iovlen
= uap
->iovcnt
* sizeof (struct iovec
);
4095 if (uap
->iovcnt
> UIO_SMALLIOV
) {
4096 if (uap
->iovcnt
> UIO_MAXIOV
) {
4100 MALLOC(iov
, struct iovec
*, iovlen
, M_IOV
, M_WAITOK
);
4106 auio
.uio_iovcnt
= uap
->iovcnt
;
4107 auio
.uio_rw
= UIO_READ
;
4108 auio
.uio_segflg
= UIO_USERSPACE
;
4109 auio
.uio_td
= nd
.nl_td
;
4110 auio
.uio_offset
= 0;
4111 if ((error
= copyin(uap
->iovp
, iov
, iovlen
)))
4114 for (i
= 0; i
< uap
->iovcnt
; i
++) {
4115 if (iov
->iov_len
> INT_MAX
- auio
.uio_resid
) {
4119 auio
.uio_resid
+= iov
->iov_len
;
4122 cnt
= auio
.uio_resid
;
4123 error
= VOP_GETEXTATTR(vp
, attrname
, &auio
, nd
.nl_cred
);
4124 cnt
-= auio
.uio_resid
;
4125 uap
->sysmsg_result
= cnt
;
4130 FREE(needfree
, M_IOV
);
4135 * Syscall to delete a named extended attribute from a file or directory.
4136 * Accepts attribute name. The real work happens in VOP_SETEXTATTR().
4139 sys_extattr_delete_file(struct extattr_delete_file_args
*uap
)
4141 char attrname
[EXTATTR_MAXNAMELEN
];
4142 struct nlookupdata nd
;
4146 error
= copyin(uap
->attrname
, attrname
, EXTATTR_MAXNAMELEN
);
4151 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
4153 error
= nlookup(&nd
);
4155 error
= ncp_writechk(&nd
.nl_nch
);
4157 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_EXCLUSIVE
, &vp
);
4163 error
= VOP_SETEXTATTR(vp
, attrname
, NULL
, nd
.nl_cred
);
4170 * Determine if the mount is visible to the process.
4173 chroot_visible_mnt(struct mount
*mp
, struct proc
*p
)
4175 struct nchandle nch
;
4178 * Traverse from the mount point upwards. If we hit the process
4179 * root then the mount point is visible to the process.
4181 nch
= mp
->mnt_ncmountpt
;
4183 if (nch
.mount
== p
->p_fd
->fd_nrdir
.mount
&&
4184 nch
.ncp
== p
->p_fd
->fd_nrdir
.ncp
) {
4187 if (nch
.ncp
== nch
.mount
->mnt_ncmountpt
.ncp
) {
4188 nch
= nch
.mount
->mnt_ncmounton
;
4190 nch
.ncp
= nch
.ncp
->nc_parent
;
4195 * If the mount point is not visible to the process, but the
4196 * process root is in a subdirectory of the mount, return
4199 if (p
->p_fd
->fd_nrdir
.mount
== mp
)