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