2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94
35 * $FreeBSD: src/sys/kern/vfs_syscalls.c,v 1.151.2.18 2003/04/04 20:35:58 tegge Exp $
38 #include <sys/param.h>
39 #include <sys/systm.h>
42 #include <sys/sysent.h>
43 #include <sys/malloc.h>
44 #include <sys/mount.h>
45 #include <sys/mountctl.h>
46 #include <sys/sysproto.h>
47 #include <sys/filedesc.h>
48 #include <sys/kernel.h>
49 #include <sys/fcntl.h>
51 #include <sys/linker.h>
53 #include <sys/unistd.h>
54 #include <sys/vnode.h>
58 #include <sys/namei.h>
59 #include <sys/nlookup.h>
60 #include <sys/dirent.h>
61 #include <sys/extattr.h>
62 #include <sys/spinlock.h>
63 #include <sys/kern_syscall.h>
64 #include <sys/objcache.h>
65 #include <sys/sysctl.h>
68 #include <sys/file2.h>
69 #include <sys/spinlock2.h>
72 #include <vm/vm_object.h>
73 #include <vm/vm_page.h>
75 #include <machine/limits.h>
76 #include <machine/stdarg.h>
78 static void mount_warning(struct mount
*mp
, const char *ctl
, ...)
80 static int mount_path(struct proc
*p
, struct mount
*mp
, char **rb
, char **fb
);
81 static int checkvp_chdir (struct vnode
*vn
, struct thread
*td
);
82 static void checkdirs (struct nchandle
*old_nch
, struct nchandle
*new_nch
);
83 static int chroot_refuse_vdir_fds (thread_t td
, struct filedesc
*fdp
);
84 static int chroot_visible_mnt(struct mount
*mp
, struct proc
*p
);
85 static int getutimes (struct timeval
*, struct timespec
*);
86 static int getutimens (const struct timespec
*, struct timespec
*, int *);
87 static int setfown (struct mount
*, struct vnode
*, uid_t
, gid_t
);
88 static int setfmode (struct vnode
*, int);
89 static int setfflags (struct vnode
*, int);
90 static int setutimes (struct vnode
*, struct vattr
*,
91 const struct timespec
*, int);
93 static int usermount
= 0; /* if 1, non-root can mount fs. */
94 SYSCTL_INT(_vfs
, OID_AUTO
, usermount
, CTLFLAG_RW
, &usermount
, 0,
95 "Allow non-root users to mount filesystems");
97 static int debug_unmount
= 0; /* if 1 loop until unmount success */
98 SYSCTL_INT(_vfs
, OID_AUTO
, debug_unmount
, CTLFLAG_RW
, &debug_unmount
, 0,
99 "Stall failed unmounts in loop");
101 * Virtual File System System Calls
105 * Mount a file system.
107 * mount_args(char *type, char *path, int flags, caddr_t data)
112 sys_mount(struct mount_args
*uap
)
114 struct thread
*td
= curthread
;
117 struct mount
*mp
, *nullmp
;
118 struct vfsconf
*vfsp
;
119 int error
, flag
= 0, flag2
= 0;
122 struct nlookupdata nd
;
123 char fstypename
[MFSNAMELEN
];
131 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 * If the target filesystem is resolved via a nullfs mount, then
165 * nd.nl_nch.mount will be pointing to the nullfs mount structure
166 * instead of the target file system. We need it in case we are
169 nullmp
= nd
.nl_nch
.mount
;
172 * Extract the locked+refd ncp and cleanup the nd structure
175 cache_zero(&nd
.nl_nch
);
178 if ((nch
.ncp
->nc_flag
& NCF_ISMOUNTPT
) &&
179 (mp
= cache_findmount(&nch
)) != NULL
) {
188 * now we have the locked ref'd nch and unreferenced vnode.
191 if ((error
= vget(vp
, LK_EXCLUSIVE
)) != 0) {
198 * Extract the file system type. We need to know this early, to take
199 * appropriate actions if we are dealing with a nullfs.
201 if ((error
= copyinstr(uap
->type
, fstypename
, MFSNAMELEN
, NULL
)) != 0) {
208 * Now we have an unlocked ref'd nch and a locked ref'd vp
210 if (uap
->flags
& MNT_UPDATE
) {
211 if ((vp
->v_flag
& (VROOT
|VPFSROOT
)) == 0) {
218 if (strncmp(fstypename
, "null", 5) == 0) {
226 flag2
= mp
->mnt_kern_flag
;
228 * We only allow the filesystem to be reloaded if it
229 * is currently mounted read-only.
231 if ((uap
->flags
& MNT_RELOAD
) &&
232 ((mp
->mnt_flag
& MNT_RDONLY
) == 0)) {
235 error
= EOPNOTSUPP
; /* Needs translation */
239 * Only root, or the user that did the original mount is
240 * permitted to update it.
242 if (mp
->mnt_stat
.f_owner
!= cred
->cr_uid
&&
243 (error
= priv_check(td
, PRIV_ROOT
))) {
248 if (vfs_busy(mp
, LK_NOWAIT
)) {
262 uap
->flags
& (MNT_RELOAD
| MNT_FORCE
| MNT_UPDATE
);
263 lwkt_gettoken(&mp
->mnt_token
);
270 * If the user is not root, ensure that they own the directory
271 * onto which we are attempting to mount.
273 if ((error
= VOP_GETATTR(vp
, &va
)) ||
274 (va
.va_uid
!= cred
->cr_uid
&&
275 (error
= priv_check(td
, PRIV_ROOT
)))) {
280 if ((error
= vinvalbuf(vp
, V_SAVE
, 0, 0)) != 0) {
285 if (vp
->v_type
!= VDIR
) {
291 if (vp
->v_mount
->mnt_kern_flag
& MNTK_NOSTKMNT
) {
297 vfsp
= vfsconf_find_by_name(fstypename
);
301 /* Only load modules for root (very important!) */
302 if ((error
= priv_check(td
, PRIV_ROOT
)) != 0) {
307 error
= linker_load_file(fstypename
, &lf
);
308 if (error
|| lf
== NULL
) {
316 /* lookup again, see if the VFS was loaded */
317 vfsp
= vfsconf_find_by_name(fstypename
);
320 linker_file_unload(lf
);
335 * Allocate and initialize the filesystem.
337 mp
= kmalloc(sizeof(struct mount
), M_MOUNT
, M_ZERO
|M_WAITOK
);
339 vfs_busy(mp
, LK_NOWAIT
);
340 mp
->mnt_op
= vfsp
->vfc_vfsops
;
342 mp
->mnt_pbuf_count
= nswbuf_kva
/ NSWBUF_SPLIT
;
343 vfsp
->vfc_refcount
++;
344 mp
->mnt_stat
.f_type
= vfsp
->vfc_typenum
;
345 mp
->mnt_flag
|= vfsp
->vfc_flags
& MNT_VISFLAGMASK
;
346 strncpy(mp
->mnt_stat
.f_fstypename
, vfsp
->vfc_name
, MFSNAMELEN
);
347 mp
->mnt_stat
.f_owner
= cred
->cr_uid
;
348 lwkt_gettoken(&mp
->mnt_token
);
352 * (per-mount token acquired at this point)
354 * Set the mount level flags.
356 if (uap
->flags
& MNT_RDONLY
)
357 mp
->mnt_flag
|= MNT_RDONLY
;
358 else if (mp
->mnt_flag
& MNT_RDONLY
)
359 mp
->mnt_kern_flag
|= MNTK_WANTRDWR
;
360 mp
->mnt_flag
&=~ (MNT_NOSUID
| MNT_NOEXEC
| MNT_NODEV
|
361 MNT_SYNCHRONOUS
| MNT_ASYNC
| MNT_NOATIME
|
362 MNT_NOSYMFOLLOW
| MNT_IGNORE
| MNT_TRIM
|
363 MNT_NOCLUSTERR
| MNT_NOCLUSTERW
| MNT_SUIDDIR
|
365 mp
->mnt_flag
|= uap
->flags
& (MNT_NOSUID
| MNT_NOEXEC
|
366 MNT_NODEV
| MNT_SYNCHRONOUS
| MNT_ASYNC
| MNT_FORCE
|
367 MNT_NOSYMFOLLOW
| MNT_IGNORE
| MNT_TRIM
|
368 MNT_NOATIME
| MNT_NOCLUSTERR
| MNT_NOCLUSTERW
| MNT_SUIDDIR
|
372 * Pre-set the mount's ALL_MPSAFE flags if specified in the vfsconf.
373 * This way the initial VFS_MOUNT() call will also be MPSAFE.
375 if (vfsp
->vfc_flags
& VFCF_MPSAFE
)
376 mp
->mnt_kern_flag
|= MNTK_ALL_MPSAFE
;
379 * Mount the filesystem.
380 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
383 error
= VFS_MOUNT(mp
, uap
->path
, uap
->data
, cred
);
384 if (mp
->mnt_flag
& MNT_UPDATE
) {
385 if (mp
->mnt_kern_flag
& MNTK_WANTRDWR
)
386 mp
->mnt_flag
&= ~MNT_RDONLY
;
387 mp
->mnt_flag
&=~ (MNT_UPDATE
| MNT_RELOAD
| MNT_FORCE
);
388 mp
->mnt_kern_flag
&=~ MNTK_WANTRDWR
;
391 mp
->mnt_kern_flag
= flag2
;
393 lwkt_reltoken(&mp
->mnt_token
);
399 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
402 * Put the new filesystem on the mount list after root. The mount
403 * point gets its own mnt_ncmountpt (unless the VFS already set one
404 * up) which represents the root of the mount. The lookup code
405 * detects the mount point going forward and checks the root of
406 * the mount going backwards.
408 * It is not necessary to invalidate or purge the vnode underneath
409 * because elements under the mount will be given their own glue
413 if (mp
->mnt_ncmountpt
.ncp
== NULL
) {
415 * Allocate, then unlock, but leave the ref intact.
416 * This is the mnt_refs (1) that we will retain
417 * through to the unmount.
419 cache_allocroot(&mp
->mnt_ncmountpt
, mp
, NULL
);
420 cache_unlock(&mp
->mnt_ncmountpt
);
423 mp
->mnt_ncmounton
= nch
; /* inherits ref */
425 nch
.ncp
->nc_flag
|= NCF_ISMOUNTPT
;
427 cache_ismounting(mp
);
428 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
430 mountlist_insert(mp
, MNTINS_LAST
);
432 checkdirs(&mp
->mnt_ncmounton
, &mp
->mnt_ncmountpt
);
433 error
= vfs_allocate_syncvnode(mp
);
434 lwkt_reltoken(&mp
->mnt_token
);
436 error
= VFS_START(mp
, 0);
438 KNOTE(&fs_klist
, VQ_MOUNT
);
440 vn_syncer_thr_stop(mp
);
441 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_coherency_ops
);
442 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_journal_ops
);
443 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_norm_ops
);
444 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_spec_ops
);
445 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_fifo_ops
);
446 mp
->mnt_vfc
->vfc_refcount
--;
447 lwkt_reltoken(&mp
->mnt_token
);
458 * Scan all active processes to see if any of them have a current
459 * or root directory onto which the new filesystem has just been
460 * mounted. If so, replace them with the new mount point.
462 * Both old_nch and new_nch are ref'd on call but not locked.
463 * new_nch must be temporarily locked so it can be associated with the
464 * vnode representing the root of the mount point.
466 struct checkdirs_info
{
467 struct nchandle old_nch
;
468 struct nchandle new_nch
;
469 struct vnode
*old_vp
;
470 struct vnode
*new_vp
;
473 static int checkdirs_callback(struct proc
*p
, void *data
);
476 checkdirs(struct nchandle
*old_nch
, struct nchandle
*new_nch
)
478 struct checkdirs_info info
;
484 * If the old mount point's vnode has a usecount of 1, it is not
485 * being held as a descriptor anywhere.
487 olddp
= old_nch
->ncp
->nc_vp
;
488 if (olddp
== NULL
|| VREFCNT(olddp
) == 1)
492 * Force the root vnode of the new mount point to be resolved
493 * so we can update any matching processes.
496 if (VFS_ROOT(mp
, &newdp
))
497 panic("mount: lost mount");
500 vn_lock(newdp
, LK_EXCLUSIVE
| LK_RETRY
);
501 cache_setunresolved(new_nch
);
502 cache_setvp(new_nch
, newdp
);
503 cache_unlock(new_nch
);
506 * Special handling of the root node
508 if (rootvnode
== olddp
) {
510 vfs_cache_setroot(newdp
, cache_hold(new_nch
));
514 * Pass newdp separately so the callback does not have to access
515 * it via new_nch->ncp->nc_vp.
517 info
.old_nch
= *old_nch
;
518 info
.new_nch
= *new_nch
;
520 allproc_scan(checkdirs_callback
, &info
, 0);
525 * NOTE: callback is not MP safe because the scanned process's filedesc
526 * structure can be ripped out from under us, amoung other things.
529 checkdirs_callback(struct proc
*p
, void *data
)
531 struct checkdirs_info
*info
= data
;
532 struct filedesc
*fdp
;
533 struct nchandle ncdrop1
;
534 struct nchandle ncdrop2
;
535 struct vnode
*vprele1
;
536 struct vnode
*vprele2
;
538 if ((fdp
= p
->p_fd
) != NULL
) {
539 cache_zero(&ncdrop1
);
540 cache_zero(&ncdrop2
);
545 * MPUNSAFE - XXX fdp can be pulled out from under a
548 * A shared filedesc is ok, we don't have to copy it
549 * because we are making this change globally.
551 spin_lock(&fdp
->fd_spin
);
552 if (fdp
->fd_ncdir
.mount
== info
->old_nch
.mount
&&
553 fdp
->fd_ncdir
.ncp
== info
->old_nch
.ncp
) {
554 vprele1
= fdp
->fd_cdir
;
556 fdp
->fd_cdir
= info
->new_vp
;
557 ncdrop1
= fdp
->fd_ncdir
;
558 cache_copy(&info
->new_nch
, &fdp
->fd_ncdir
);
560 if (fdp
->fd_nrdir
.mount
== info
->old_nch
.mount
&&
561 fdp
->fd_nrdir
.ncp
== info
->old_nch
.ncp
) {
562 vprele2
= fdp
->fd_rdir
;
564 fdp
->fd_rdir
= info
->new_vp
;
565 ncdrop2
= fdp
->fd_nrdir
;
566 cache_copy(&info
->new_nch
, &fdp
->fd_nrdir
);
568 spin_unlock(&fdp
->fd_spin
);
570 cache_drop(&ncdrop1
);
572 cache_drop(&ncdrop2
);
582 * Unmount a file system.
584 * Note: unmount takes a path to the vnode mounted on as argument,
585 * not special file (as before).
587 * umount_args(char *path, int flags)
592 sys_unmount(struct unmount_args
*uap
)
594 struct thread
*td
= curthread
;
595 struct proc
*p __debugvar
= td
->td_proc
;
596 struct mount
*mp
= NULL
;
597 struct nlookupdata nd
;
601 if (td
->td_ucred
->cr_prison
!= NULL
) {
605 if (usermount
== 0 && (error
= priv_check(td
, PRIV_ROOT
)))
608 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
610 error
= nlookup(&nd
);
614 mp
= nd
.nl_nch
.mount
;
617 * Only root, or the user that did the original mount is
618 * permitted to unmount this filesystem.
620 if ((mp
->mnt_stat
.f_owner
!= td
->td_ucred
->cr_uid
) &&
621 (error
= priv_check(td
, PRIV_ROOT
)))
625 * Don't allow unmounting the root file system.
627 if (mp
->mnt_flag
& MNT_ROOTFS
) {
633 * Must be the root of the filesystem
635 if (nd
.nl_nch
.ncp
!= mp
->mnt_ncmountpt
.ncp
) {
641 * If no error try to issue the unmount. We lose our cache
642 * ref when we call nlookup_done so we must hold the mount point
643 * to prevent use-after-free races.
649 error
= dounmount(mp
, uap
->flags
, 0);
659 * Do the actual file system unmount (interlocked against the mountlist
660 * token and mp->mnt_token).
663 dounmount_interlock(struct mount
*mp
)
665 if (mp
->mnt_kern_flag
& MNTK_UNMOUNT
)
667 mp
->mnt_kern_flag
|= MNTK_UNMOUNT
;
672 unmount_allproc_cb(struct proc
*p
, void *arg
)
676 if (p
->p_textnch
.ncp
== NULL
)
679 mp
= (struct mount
*)arg
;
680 if (p
->p_textnch
.mount
== mp
)
681 cache_drop(&p
->p_textnch
);
687 * The guts of the unmount code. The mount owns one ref and one hold
688 * count. If we successfully interlock the unmount, those refs are ours.
689 * (The ref is from mnt_ncmountpt).
691 * When halting we shortcut certain mount types such as devfs by not actually
692 * issuing the VFS_SYNC() or VFS_UNMOUNT(). They are still disconnected
693 * from the mountlist so higher-level filesytems can unmount cleanly.
695 * The mount types that allow QUICKHALT are: devfs, tmpfs, procfs.
698 dounmount(struct mount
*mp
, int flags
, int halting
)
700 struct namecache
*ncp
;
711 lwkt_gettoken(&mp
->mnt_token
);
714 * When halting, certain mount points can essentially just
715 * be unhooked and otherwise ignored.
717 if (halting
&& (mp
->mnt_kern_flag
& MNTK_QUICKHALT
)) {
726 * Exclusive access for unmounting purposes.
728 if ((error
= mountlist_interlock(dounmount_interlock
, mp
)) != 0)
732 * We now 'own' the last mp->mnt_refs
734 * Allow filesystems to detect that a forced unmount is in progress.
736 if (flags
& MNT_FORCE
)
737 mp
->mnt_kern_flag
|= MNTK_UNMOUNTF
;
738 lflags
= LK_EXCLUSIVE
| ((flags
& MNT_FORCE
) ? 0 : LK_TIMELOCK
);
739 error
= lockmgr(&mp
->mnt_lock
, lflags
);
741 mp
->mnt_kern_flag
&= ~(MNTK_UNMOUNT
| MNTK_UNMOUNTF
);
742 if (mp
->mnt_kern_flag
& MNTK_MWAIT
) {
743 mp
->mnt_kern_flag
&= ~MNTK_MWAIT
;
749 if (mp
->mnt_flag
& MNT_EXPUBLIC
)
750 vfs_setpublicfs(NULL
, NULL
, NULL
);
752 vfs_msync(mp
, MNT_WAIT
);
753 async_flag
= mp
->mnt_flag
& MNT_ASYNC
;
754 mp
->mnt_flag
&=~ MNT_ASYNC
;
757 * Decomission our special mnt_syncer vnode. This also stops
758 * the vnlru code. If we are unable to unmount we recommission
761 * Then sync the filesystem.
763 if ((vp
= mp
->mnt_syncer
) != NULL
) {
764 mp
->mnt_syncer
= NULL
;
765 atomic_set_int(&vp
->v_refcnt
, VREF_FINALIZE
);
771 * Sync normally-mounted filesystem.
773 if (quickhalt
== 0) {
774 if ((mp
->mnt_flag
& MNT_RDONLY
) == 0)
775 VFS_SYNC(mp
, MNT_WAIT
);
779 * nchandle records ref the mount structure. Expect a count of 1
780 * (our mount->mnt_ncmountpt).
782 * Scans can get temporary refs on a mountpoint (thought really
783 * heavy duty stuff like cache_findmount() do not).
785 for (retry
= 0; (retry
< 10 || debug_unmount
); ++retry
) {
787 * Invalidate the namecache topology under the mount.
788 * nullfs mounts alias a real mount's namecache topology
789 * and it should not be invalidated in that case.
791 if ((mp
->mnt_kern_flag
& MNTK_NCALIASED
) == 0) {
792 cache_lock(&mp
->mnt_ncmountpt
);
793 cache_inval(&mp
->mnt_ncmountpt
,
794 CINV_DESTROY
|CINV_CHILDREN
);
795 cache_unlock(&mp
->mnt_ncmountpt
);
801 cache_unmounting(mp
);
802 if (mp
->mnt_refs
!= 1)
803 cache_clearmntcache();
806 * Break out if we are good. Don't count ncp refs if the
809 ncp
= (mp
->mnt_kern_flag
& MNTK_NCALIASED
) ?
810 NULL
: mp
->mnt_ncmountpt
.ncp
;
811 if (mp
->mnt_refs
== 1 &&
812 (ncp
== NULL
|| (ncp
->nc_refs
== 1 &&
813 TAILQ_FIRST(&ncp
->nc_list
) == NULL
))) {
818 * If forcing the unmount, clean out any p->p_textnch
819 * nchandles that match this mount.
821 if (flags
& MNT_FORCE
)
822 allproc_scan(&unmount_allproc_cb
, mp
, 0);
827 tsleep(&mp
->mnt_refs
, 0, "mntbsy", hz
/ 10 + 1);
828 if ((retry
& 15) == 15) {
830 "(%p) debug - retry %d, "
831 "%d namecache refs, %d mount refs",
833 (ncp
? ncp
->nc_refs
- 1 : 0),
839 ncp
= (mp
->mnt_kern_flag
& MNTK_NCALIASED
) ?
840 NULL
: mp
->mnt_ncmountpt
.ncp
;
841 if (mp
->mnt_refs
!= 1 ||
842 (ncp
!= NULL
&& (ncp
->nc_refs
!= 1 ||
843 TAILQ_FIRST(&ncp
->nc_list
)))) {
845 "(%p): %d namecache refs, %d mount refs "
848 (ncp
? ncp
->nc_refs
- 1 : 0),
850 if (flags
& MNT_FORCE
) {
852 mount_warning(mp
, "forcing unmount\n");
859 * So far so good, sync the filesystem once more and
860 * call the VFS unmount code if the sync succeeds.
862 if (error
== 0 && quickhalt
== 0) {
863 if (mp
->mnt_flag
& MNT_RDONLY
) {
864 error
= VFS_UNMOUNT(mp
, flags
);
866 error
= VFS_SYNC(mp
, MNT_WAIT
);
868 (error
== EOPNOTSUPP
) || /* No sync */
869 (flags
& MNT_FORCE
)) {
870 error
= VFS_UNMOUNT(mp
, flags
);
875 "(%p) unmount: vfs refused to unmount, "
882 * If an error occurred we can still recover, restoring the
883 * syncer vnode and misc flags.
886 if (mp
->mnt_syncer
== NULL
&& hadsyncer
)
887 vfs_allocate_syncvnode(mp
);
888 mp
->mnt_kern_flag
&= ~(MNTK_UNMOUNT
| MNTK_UNMOUNTF
);
889 mp
->mnt_flag
|= async_flag
;
890 lockmgr(&mp
->mnt_lock
, LK_RELEASE
);
891 if (mp
->mnt_kern_flag
& MNTK_MWAIT
) {
892 mp
->mnt_kern_flag
&= ~MNTK_MWAIT
;
898 * Clean up any journals still associated with the mount after
899 * filesystem activity has ceased.
901 journal_remove_all_journals(mp
,
902 ((flags
& MNT_FORCE
) ? MC_JOURNAL_STOP_IMM
: 0));
904 mountlist_remove(mp
);
907 * Remove any installed vnode ops here so the individual VFSs don't
910 * mnt_refs should go to zero when we scrap mnt_ncmountpt.
912 * When quickhalting we have to keep these intact because the
913 * underlying vnodes have not been destroyed, and some might be
916 if (quickhalt
== 0) {
917 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_coherency_ops
);
918 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_journal_ops
);
919 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_norm_ops
);
920 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_spec_ops
);
921 vfs_rm_vnodeops(mp
, NULL
, &mp
->mnt_vn_fifo_ops
);
924 if (mp
->mnt_ncmountpt
.ncp
!= NULL
) {
925 nch
= mp
->mnt_ncmountpt
;
926 cache_zero(&mp
->mnt_ncmountpt
);
927 cache_clrmountpt(&nch
);
930 if (mp
->mnt_ncmounton
.ncp
!= NULL
) {
931 cache_unmounting(mp
);
932 nch
= mp
->mnt_ncmounton
;
933 cache_zero(&mp
->mnt_ncmounton
);
934 cache_clrmountpt(&nch
);
938 mp
->mnt_vfc
->vfc_refcount
--;
941 * If not quickhalting the mount, we expect there to be no
944 if (quickhalt
== 0 && !TAILQ_EMPTY(&mp
->mnt_nvnodelist
))
945 panic("unmount: dangling vnode");
950 lockmgr(&mp
->mnt_lock
, LK_RELEASE
);
951 if (mp
->mnt_kern_flag
& MNTK_MWAIT
) {
952 mp
->mnt_kern_flag
&= ~MNTK_MWAIT
;
957 * If we reach here and freeok != 0 we must free the mount.
958 * mnt_refs should already have dropped to 0, so if it is not
959 * zero we must cycle the caches and wait.
961 * When we are satisfied that the mount has disconnected we can
962 * drop the hold on the mp that represented the mount (though the
963 * caller might actually have another, so the caller's drop may
964 * do the actual free).
967 if (mp
->mnt_refs
> 0)
968 cache_clearmntcache();
969 while (mp
->mnt_refs
> 0) {
970 cache_unmounting(mp
);
972 tsleep(&mp
->mnt_refs
, 0, "umntrwait", hz
/ 10 + 1);
973 cache_clearmntcache();
975 lwkt_reltoken(&mp
->mnt_token
);
979 cache_clearmntcache();
982 KNOTE(&fs_klist
, VQ_UNMOUNT
);
985 lwkt_reltoken(&mp
->mnt_token
);
991 mount_warning(struct mount
*mp
, const char *ctl
, ...)
998 if (cache_fullpath(NULL
, &mp
->mnt_ncmounton
, NULL
,
999 &ptr
, &buf
, 0) == 0) {
1000 kprintf("unmount(%s): ", ptr
);
1005 kprintf("unmount(%p", mp
);
1006 if (mp
->mnt_ncmounton
.ncp
&& mp
->mnt_ncmounton
.ncp
->nc_name
)
1007 kprintf(",%s", mp
->mnt_ncmounton
.ncp
->nc_name
);
1016 * Shim cache_fullpath() to handle the case where a process is chrooted into
1017 * a subdirectory of a mount. In this case if the root mount matches the
1018 * process root directory's mount we have to specify the process's root
1019 * directory instead of the mount point, because the mount point might
1020 * be above the root directory.
1024 mount_path(struct proc
*p
, struct mount
*mp
, char **rb
, char **fb
)
1026 struct nchandle
*nch
;
1028 if (p
&& p
->p_fd
->fd_nrdir
.mount
== mp
)
1029 nch
= &p
->p_fd
->fd_nrdir
;
1031 nch
= &mp
->mnt_ncmountpt
;
1032 return(cache_fullpath(p
, nch
, NULL
, rb
, fb
, 0));
1036 * Sync each mounted filesystem.
1040 static int syncprt
= 0;
1041 SYSCTL_INT(_debug
, OID_AUTO
, syncprt
, CTLFLAG_RW
, &syncprt
, 0, "");
1044 static int sync_callback(struct mount
*mp
, void *data
);
1047 sys_sync(struct sync_args
*uap
)
1049 mountlist_scan(sync_callback
, NULL
, MNTSCAN_FORWARD
);
1055 sync_callback(struct mount
*mp
, void *data __unused
)
1059 if ((mp
->mnt_flag
& MNT_RDONLY
) == 0) {
1060 lwkt_gettoken(&mp
->mnt_token
);
1061 asyncflag
= mp
->mnt_flag
& MNT_ASYNC
;
1062 mp
->mnt_flag
&= ~MNT_ASYNC
;
1063 lwkt_reltoken(&mp
->mnt_token
);
1064 vfs_msync(mp
, MNT_NOWAIT
);
1065 VFS_SYNC(mp
, MNT_NOWAIT
);
1066 lwkt_gettoken(&mp
->mnt_token
);
1067 mp
->mnt_flag
|= asyncflag
;
1068 lwkt_reltoken(&mp
->mnt_token
);
1073 /* XXX PRISON: could be per prison flag */
1074 static int prison_quotas
;
1076 SYSCTL_INT(_kern_prison
, OID_AUTO
, quotas
, CTLFLAG_RW
, &prison_quotas
, 0, "");
1080 * quotactl_args(char *path, int fcmd, int uid, caddr_t arg)
1082 * Change filesystem quotas.
1087 sys_quotactl(struct quotactl_args
*uap
)
1089 struct nlookupdata nd
;
1095 if (td
->td_ucred
->cr_prison
&& !prison_quotas
) {
1100 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
1102 error
= nlookup(&nd
);
1104 mp
= nd
.nl_nch
.mount
;
1105 error
= VFS_QUOTACTL(mp
, uap
->cmd
, uap
->uid
,
1106 uap
->arg
, nd
.nl_cred
);
1114 * mountctl(char *path, int op, int fd, const void *ctl, int ctllen,
1115 * void *buf, int buflen)
1117 * This function operates on a mount point and executes the specified
1118 * operation using the specified control data, and possibly returns data.
1120 * The actual number of bytes stored in the result buffer is returned, 0
1121 * if none, otherwise an error is returned.
1126 sys_mountctl(struct mountctl_args
*uap
)
1128 struct thread
*td
= curthread
;
1136 * Sanity and permissions checks. We must be root.
1138 if (td
->td_ucred
->cr_prison
!= NULL
)
1140 if ((uap
->op
!= MOUNTCTL_MOUNTFLAGS
) &&
1141 (error
= priv_check(td
, PRIV_ROOT
)) != 0)
1145 * Argument length checks
1147 if (uap
->ctllen
< 0 || uap
->ctllen
> 1024)
1149 if (uap
->buflen
< 0 || uap
->buflen
> 16 * 1024)
1151 if (uap
->path
== NULL
)
1155 * Allocate the necessary buffers and copyin data
1157 path
= objcache_get(namei_oc
, M_WAITOK
);
1158 error
= copyinstr(uap
->path
, path
, MAXPATHLEN
, NULL
);
1163 ctl
= kmalloc(uap
->ctllen
+ 1, M_TEMP
, M_WAITOK
|M_ZERO
);
1164 error
= copyin(uap
->ctl
, ctl
, uap
->ctllen
);
1169 buf
= kmalloc(uap
->buflen
+ 1, M_TEMP
, M_WAITOK
|M_ZERO
);
1172 * Validate the descriptor
1175 fp
= holdfp(td
, uap
->fd
, -1);
1185 * Execute the internal kernel function and clean up.
1187 error
= kern_mountctl(path
, uap
->op
, fp
, ctl
, uap
->ctllen
,
1188 buf
, uap
->buflen
, &uap
->sysmsg_result
);
1190 dropfp(td
, uap
->fd
, fp
);
1191 if (error
== 0 && uap
->sysmsg_result
> 0)
1192 error
= copyout(buf
, uap
->buf
, uap
->sysmsg_result
);
1195 objcache_put(namei_oc
, path
);
1204 * Execute a mount control operation by resolving the path to a mount point
1205 * and calling vop_mountctl().
1207 * Use the mount point from the nch instead of the vnode so nullfs mounts
1208 * can properly spike the VOP.
1211 kern_mountctl(const char *path
, int op
, struct file
*fp
,
1212 const void *ctl
, int ctllen
,
1213 void *buf
, int buflen
, int *res
)
1216 struct nlookupdata nd
;
1217 struct nchandle nch
;
1223 error
= nlookup_init(&nd
, path
, UIO_SYSSPACE
, NLC_FOLLOW
);
1226 error
= nlookup(&nd
);
1231 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_EXCLUSIVE
, &vp
);
1238 * Yes, all this is needed to use the nch.mount below, because
1239 * we must maintain a ref on the mount to avoid ripouts (e.g.
1240 * due to heavy mount/unmount use by synth or poudriere).
1243 cache_zero(&nd
.nl_nch
);
1251 * Must be the root of the filesystem
1253 if ((vp
->v_flag
& (VROOT
|VPFSROOT
)) == 0) {
1258 if (mp
== NULL
|| mp
->mnt_kern_flag
& MNTK_UNMOUNT
) {
1259 kprintf("kern_mountctl: Warning, \"%s\" racing unmount\n",
1265 error
= vop_mountctl(mp
->mnt_vn_use_ops
, vp
, op
, fp
, ctl
, ctllen
,
1274 kern_statfs(struct nlookupdata
*nd
, struct statfs
*buf
)
1276 struct thread
*td
= curthread
;
1277 struct proc
*p
= td
->td_proc
;
1280 char *fullpath
, *freepath
;
1283 if ((error
= nlookup(nd
)) != 0)
1285 mp
= nd
->nl_nch
.mount
;
1287 if ((error
= VFS_STATFS(mp
, sp
, nd
->nl_cred
)) != 0)
1290 error
= mount_path(p
, mp
, &fullpath
, &freepath
);
1293 bzero(sp
->f_mntonname
, sizeof(sp
->f_mntonname
));
1294 strlcpy(sp
->f_mntonname
, fullpath
, sizeof(sp
->f_mntonname
));
1295 kfree(freepath
, M_TEMP
);
1297 sp
->f_flags
= mp
->mnt_flag
& MNT_VISFLAGMASK
;
1298 bcopy(sp
, buf
, sizeof(*buf
));
1299 /* Only root should have access to the fsid's. */
1300 if (priv_check(td
, PRIV_ROOT
))
1301 buf
->f_fsid
.val
[0] = buf
->f_fsid
.val
[1] = 0;
1306 * statfs_args(char *path, struct statfs *buf)
1308 * Get filesystem statistics.
1311 sys_statfs(struct statfs_args
*uap
)
1313 struct nlookupdata nd
;
1317 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
1319 error
= kern_statfs(&nd
, &buf
);
1322 error
= copyout(&buf
, uap
->buf
, sizeof(*uap
->buf
));
1327 kern_fstatfs(int fd
, struct statfs
*buf
)
1329 struct thread
*td
= curthread
;
1330 struct proc
*p
= td
->td_proc
;
1334 char *fullpath
, *freepath
;
1338 if ((error
= holdvnode(td
, fd
, &fp
)) != 0)
1342 * Try to use mount info from any overlays rather than the
1343 * mount info for the underlying vnode, otherwise we will
1344 * fail when operating on null-mounted paths inside a chroot.
1346 if ((mp
= fp
->f_nchandle
.mount
) == NULL
)
1347 mp
= ((struct vnode
*)fp
->f_data
)->v_mount
;
1352 if (fp
->f_cred
== NULL
) {
1357 if ((error
= VFS_STATFS(mp
, sp
, fp
->f_cred
)) != 0)
1360 if ((error
= mount_path(p
, mp
, &fullpath
, &freepath
)) != 0)
1362 bzero(sp
->f_mntonname
, sizeof(sp
->f_mntonname
));
1363 strlcpy(sp
->f_mntonname
, fullpath
, sizeof(sp
->f_mntonname
));
1364 kfree(freepath
, M_TEMP
);
1366 sp
->f_flags
= mp
->mnt_flag
& MNT_VISFLAGMASK
;
1367 bcopy(sp
, buf
, sizeof(*buf
));
1369 /* Only root should have access to the fsid's. */
1370 if (priv_check(td
, PRIV_ROOT
))
1371 buf
->f_fsid
.val
[0] = buf
->f_fsid
.val
[1] = 0;
1379 * fstatfs_args(int fd, struct statfs *buf)
1381 * Get filesystem statistics.
1384 sys_fstatfs(struct fstatfs_args
*uap
)
1389 error
= kern_fstatfs(uap
->fd
, &buf
);
1392 error
= copyout(&buf
, uap
->buf
, sizeof(*uap
->buf
));
1397 kern_statvfs(struct nlookupdata
*nd
, struct statvfs
*buf
)
1403 if ((error
= nlookup(nd
)) != 0)
1405 mp
= nd
->nl_nch
.mount
;
1406 sp
= &mp
->mnt_vstat
;
1407 if ((error
= VFS_STATVFS(mp
, sp
, nd
->nl_cred
)) != 0)
1411 if (mp
->mnt_flag
& MNT_RDONLY
)
1412 sp
->f_flag
|= ST_RDONLY
;
1413 if (mp
->mnt_flag
& MNT_NOSUID
)
1414 sp
->f_flag
|= ST_NOSUID
;
1415 bcopy(sp
, buf
, sizeof(*buf
));
1420 * statfs_args(char *path, struct statfs *buf)
1422 * Get filesystem statistics.
1425 sys_statvfs(struct statvfs_args
*uap
)
1427 struct nlookupdata nd
;
1431 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
1433 error
= kern_statvfs(&nd
, &buf
);
1436 error
= copyout(&buf
, uap
->buf
, sizeof(*uap
->buf
));
1441 kern_fstatvfs(int fd
, struct statvfs
*buf
)
1443 struct thread
*td
= curthread
;
1449 if ((error
= holdvnode(td
, fd
, &fp
)) != 0)
1451 if ((mp
= fp
->f_nchandle
.mount
) == NULL
)
1452 mp
= ((struct vnode
*)fp
->f_data
)->v_mount
;
1457 if (fp
->f_cred
== NULL
) {
1461 sp
= &mp
->mnt_vstat
;
1462 if ((error
= VFS_STATVFS(mp
, sp
, fp
->f_cred
)) != 0)
1466 if (mp
->mnt_flag
& MNT_RDONLY
)
1467 sp
->f_flag
|= ST_RDONLY
;
1468 if (mp
->mnt_flag
& MNT_NOSUID
)
1469 sp
->f_flag
|= ST_NOSUID
;
1471 bcopy(sp
, buf
, sizeof(*buf
));
1479 * fstatfs_args(int fd, struct statfs *buf)
1481 * Get filesystem statistics.
1484 sys_fstatvfs(struct fstatvfs_args
*uap
)
1489 error
= kern_fstatvfs(uap
->fd
, &buf
);
1492 error
= copyout(&buf
, uap
->buf
, sizeof(*uap
->buf
));
1497 * getfsstat_args(struct statfs *buf, long bufsize, int flags)
1499 * Get statistics on all filesystems.
1502 struct getfsstat_info
{
1503 struct statfs
*sfsp
;
1511 static int getfsstat_callback(struct mount
*, void *);
1514 sys_getfsstat(struct getfsstat_args
*uap
)
1516 struct thread
*td
= curthread
;
1517 struct getfsstat_info info
;
1519 bzero(&info
, sizeof(info
));
1521 info
.maxcount
= uap
->bufsize
/ sizeof(struct statfs
);
1522 info
.sfsp
= uap
->buf
;
1524 info
.flags
= uap
->flags
;
1527 mountlist_scan(getfsstat_callback
, &info
, MNTSCAN_FORWARD
);
1528 if (info
.sfsp
&& info
.count
> info
.maxcount
)
1529 uap
->sysmsg_result
= info
.maxcount
;
1531 uap
->sysmsg_result
= info
.count
;
1532 return (info
.error
);
1536 getfsstat_callback(struct mount
*mp
, void *data
)
1538 struct getfsstat_info
*info
= data
;
1544 if (info
->td
->td_proc
&& !chroot_visible_mnt(mp
, info
->td
->td_proc
))
1547 if (info
->sfsp
&& info
->count
< info
->maxcount
) {
1551 * If MNT_NOWAIT or MNT_LAZY is specified, do not
1552 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
1553 * overrides MNT_WAIT.
1555 if (((info
->flags
& (MNT_LAZY
|MNT_NOWAIT
)) == 0 ||
1556 (info
->flags
& MNT_WAIT
)) &&
1557 (error
= VFS_STATFS(mp
, sp
, info
->td
->td_ucred
))) {
1560 sp
->f_flags
= mp
->mnt_flag
& MNT_VISFLAGMASK
;
1562 error
= mount_path(info
->td
->td_proc
, mp
, &fullpath
, &freepath
);
1564 info
->error
= error
;
1567 bzero(sp
->f_mntonname
, sizeof(sp
->f_mntonname
));
1568 strlcpy(sp
->f_mntonname
, fullpath
, sizeof(sp
->f_mntonname
));
1569 kfree(freepath
, M_TEMP
);
1571 error
= copyout(sp
, info
->sfsp
, sizeof(*sp
));
1573 info
->error
= error
;
1583 * getvfsstat_args(struct statfs *buf, struct statvfs *vbuf,
1584 long bufsize, int flags)
1586 * Get statistics on all filesystems.
1589 struct getvfsstat_info
{
1590 struct statfs
*sfsp
;
1591 struct statvfs
*vsfsp
;
1599 static int getvfsstat_callback(struct mount
*, void *);
1602 sys_getvfsstat(struct getvfsstat_args
*uap
)
1604 struct thread
*td
= curthread
;
1605 struct getvfsstat_info info
;
1607 bzero(&info
, sizeof(info
));
1609 info
.maxcount
= uap
->vbufsize
/ sizeof(struct statvfs
);
1610 info
.sfsp
= uap
->buf
;
1611 info
.vsfsp
= uap
->vbuf
;
1613 info
.flags
= uap
->flags
;
1616 mountlist_scan(getvfsstat_callback
, &info
, MNTSCAN_FORWARD
);
1617 if (info
.vsfsp
&& info
.count
> info
.maxcount
)
1618 uap
->sysmsg_result
= info
.maxcount
;
1620 uap
->sysmsg_result
= info
.count
;
1621 return (info
.error
);
1625 getvfsstat_callback(struct mount
*mp
, void *data
)
1627 struct getvfsstat_info
*info
= data
;
1629 struct statvfs
*vsp
;
1634 if (info
->td
->td_proc
&& !chroot_visible_mnt(mp
, info
->td
->td_proc
))
1637 if (info
->vsfsp
&& info
->count
< info
->maxcount
) {
1639 vsp
= &mp
->mnt_vstat
;
1642 * If MNT_NOWAIT or MNT_LAZY is specified, do not
1643 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY
1644 * overrides MNT_WAIT.
1646 if (((info
->flags
& (MNT_LAZY
|MNT_NOWAIT
)) == 0 ||
1647 (info
->flags
& MNT_WAIT
)) &&
1648 (error
= VFS_STATFS(mp
, sp
, info
->td
->td_ucred
))) {
1651 sp
->f_flags
= mp
->mnt_flag
& MNT_VISFLAGMASK
;
1653 if (((info
->flags
& (MNT_LAZY
|MNT_NOWAIT
)) == 0 ||
1654 (info
->flags
& MNT_WAIT
)) &&
1655 (error
= VFS_STATVFS(mp
, vsp
, info
->td
->td_ucred
))) {
1659 if (mp
->mnt_flag
& MNT_RDONLY
)
1660 vsp
->f_flag
|= ST_RDONLY
;
1661 if (mp
->mnt_flag
& MNT_NOSUID
)
1662 vsp
->f_flag
|= ST_NOSUID
;
1664 error
= mount_path(info
->td
->td_proc
, mp
, &fullpath
, &freepath
);
1666 info
->error
= error
;
1669 bzero(sp
->f_mntonname
, sizeof(sp
->f_mntonname
));
1670 strlcpy(sp
->f_mntonname
, fullpath
, sizeof(sp
->f_mntonname
));
1671 kfree(freepath
, M_TEMP
);
1673 error
= copyout(sp
, info
->sfsp
, sizeof(*sp
));
1675 error
= copyout(vsp
, info
->vsfsp
, sizeof(*vsp
));
1677 info
->error
= error
;
1689 * fchdir_args(int fd)
1691 * Change current working directory to a given file descriptor.
1694 sys_fchdir(struct fchdir_args
*uap
)
1696 struct thread
*td
= curthread
;
1697 struct proc
*p
= td
->td_proc
;
1698 struct filedesc
*fdp
= p
->p_fd
;
1699 struct vnode
*vp
, *ovp
;
1702 struct nchandle nch
, onch
, tnch
;
1705 if ((error
= holdvnode(td
, uap
->fd
, &fp
)) != 0)
1707 lwkt_gettoken(&p
->p_token
);
1708 vp
= (struct vnode
*)fp
->f_data
;
1710 vn_lock(vp
, LK_SHARED
| LK_RETRY
);
1711 if (fp
->f_nchandle
.ncp
== NULL
)
1714 error
= checkvp_chdir(vp
, td
);
1719 cache_copy(&fp
->f_nchandle
, &nch
);
1722 * If the ncp has become a mount point, traverse through
1726 while (!error
&& (nch
.ncp
->nc_flag
& NCF_ISMOUNTPT
) &&
1727 (mp
= cache_findmount(&nch
)) != NULL
1729 error
= nlookup_mp(mp
, &tnch
);
1731 cache_unlock(&tnch
); /* leave ref intact */
1733 vp
= tnch
.ncp
->nc_vp
;
1734 error
= vget(vp
, LK_SHARED
);
1735 KKASSERT(error
== 0);
1739 cache_dropmount(mp
);
1742 spin_lock(&fdp
->fd_spin
);
1744 onch
= fdp
->fd_ncdir
;
1746 fdp
->fd_ncdir
= nch
;
1747 spin_unlock(&fdp
->fd_spin
);
1748 vn_unlock(vp
); /* leave ref intact */
1757 lwkt_reltoken(&p
->p_token
);
1762 kern_chdir(struct nlookupdata
*nd
)
1764 struct thread
*td
= curthread
;
1765 struct proc
*p
= td
->td_proc
;
1766 struct filedesc
*fdp
= p
->p_fd
;
1767 struct vnode
*vp
, *ovp
;
1768 struct nchandle onch
;
1771 nd
->nl_flags
|= NLC_SHAREDLOCK
;
1772 if ((error
= nlookup(nd
)) != 0)
1774 if ((vp
= nd
->nl_nch
.ncp
->nc_vp
) == NULL
)
1776 if ((error
= vget(vp
, LK_SHARED
)) != 0)
1779 lwkt_gettoken(&p
->p_token
);
1780 error
= checkvp_chdir(vp
, td
);
1783 spin_lock(&fdp
->fd_spin
);
1785 onch
= fdp
->fd_ncdir
;
1786 fdp
->fd_ncdir
= nd
->nl_nch
;
1788 spin_unlock(&fdp
->fd_spin
);
1789 cache_unlock(&nd
->nl_nch
); /* leave reference intact */
1792 cache_zero(&nd
->nl_nch
);
1796 lwkt_reltoken(&p
->p_token
);
1801 * chdir_args(char *path)
1803 * Change current working directory (``.'').
1806 sys_chdir(struct chdir_args
*uap
)
1808 struct nlookupdata nd
;
1811 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
1813 error
= kern_chdir(&nd
);
1819 * Helper function for raised chroot(2) security function: Refuse if
1820 * any filedescriptors are open directories.
1823 chroot_refuse_vdir_fds(thread_t td
, struct filedesc
*fdp
)
1830 for (fd
= 0; fd
< fdp
->fd_nfiles
; fd
++) {
1831 if ((error
= holdvnode(td
, fd
, &fp
)) != 0)
1833 vp
= (struct vnode
*)fp
->f_data
;
1834 if (vp
->v_type
!= VDIR
) {
1845 * This sysctl determines if we will allow a process to chroot(2) if it
1846 * has a directory open:
1847 * 0: disallowed for all processes.
1848 * 1: allowed for processes that were not already chroot(2)'ed.
1849 * 2: allowed for all processes.
1852 static int chroot_allow_open_directories
= 1;
1854 SYSCTL_INT(_kern
, OID_AUTO
, chroot_allow_open_directories
, CTLFLAG_RW
,
1855 &chroot_allow_open_directories
, 0, "");
1858 * chroot to the specified namecache entry. We obtain the vp from the
1859 * namecache data. The passed ncp must be locked and referenced and will
1860 * remain locked and referenced on return.
1863 kern_chroot(struct nchandle
*nch
)
1865 struct thread
*td
= curthread
;
1866 struct proc
*p
= td
->td_proc
;
1867 struct filedesc
*fdp
= p
->p_fd
;
1872 * Only privileged user can chroot
1874 error
= priv_check_cred(td
->td_ucred
, PRIV_VFS_CHROOT
, 0);
1879 * Disallow open directory descriptors (fchdir() breakouts).
1881 if (chroot_allow_open_directories
== 0 ||
1882 (chroot_allow_open_directories
== 1 && fdp
->fd_rdir
!= rootvnode
)) {
1883 if ((error
= chroot_refuse_vdir_fds(td
, fdp
)) != 0)
1886 if ((vp
= nch
->ncp
->nc_vp
) == NULL
)
1889 if ((error
= vget(vp
, LK_SHARED
)) != 0)
1893 * Check the validity of vp as a directory to change to and
1894 * associate it with rdir/jdir.
1896 error
= checkvp_chdir(vp
, td
);
1897 vn_unlock(vp
); /* leave reference intact */
1899 lwkt_gettoken(&p
->p_token
);
1900 vrele(fdp
->fd_rdir
);
1901 fdp
->fd_rdir
= vp
; /* reference inherited by fd_rdir */
1902 cache_drop(&fdp
->fd_nrdir
);
1903 cache_copy(nch
, &fdp
->fd_nrdir
);
1904 if (fdp
->fd_jdir
== NULL
) {
1907 cache_copy(nch
, &fdp
->fd_njdir
);
1909 if ((p
->p_flags
& P_DIDCHROOT
) == 0) {
1910 p
->p_flags
|= P_DIDCHROOT
;
1911 if (p
->p_depth
<= 65535 - 32)
1914 lwkt_reltoken(&p
->p_token
);
1922 * chroot_args(char *path)
1924 * Change notion of root (``/'') directory.
1927 sys_chroot(struct chroot_args
*uap
)
1929 struct thread
*td __debugvar
= curthread
;
1930 struct nlookupdata nd
;
1933 KKASSERT(td
->td_proc
);
1934 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
1936 nd
.nl_flags
|= NLC_EXEC
;
1937 error
= nlookup(&nd
);
1939 error
= kern_chroot(&nd
.nl_nch
);
1946 sys_chroot_kernel(struct chroot_kernel_args
*uap
)
1948 struct thread
*td
= curthread
;
1949 struct nlookupdata nd
;
1950 struct nchandle
*nch
;
1954 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
1958 error
= nlookup(&nd
);
1964 error
= priv_check_cred(td
->td_ucred
, PRIV_VFS_CHROOT
, 0);
1968 if ((vp
= nch
->ncp
->nc_vp
) == NULL
) {
1973 if ((error
= cache_vref(nch
, nd
.nl_cred
, &vp
)) != 0)
1976 kprintf("chroot_kernel: set new rootnch/rootvnode to %s\n", uap
->path
);
1977 vfs_cache_setroot(vp
, cache_hold(nch
));
1986 * Common routine for chroot and chdir. Given a locked, referenced vnode,
1987 * determine whether it is legal to chdir to the vnode. The vnode's state
1988 * is not changed by this call.
1991 checkvp_chdir(struct vnode
*vp
, struct thread
*td
)
1995 if (vp
->v_type
!= VDIR
)
1998 error
= VOP_EACCESS(vp
, VEXEC
, td
->td_ucred
);
2003 kern_open(struct nlookupdata
*nd
, int oflags
, int mode
, int *res
)
2005 struct thread
*td
= curthread
;
2006 struct proc
*p
= td
->td_proc
;
2007 struct lwp
*lp
= td
->td_lwp
;
2008 struct filedesc
*fdp
= p
->p_fd
;
2013 int type
, indx
, error
= 0;
2016 if ((oflags
& O_ACCMODE
) == O_ACCMODE
)
2018 flags
= FFLAGS(oflags
);
2019 error
= falloc(lp
, &nfp
, NULL
);
2023 cmode
= ((mode
&~ fdp
->fd_cmask
) & ALLPERMS
) & ~S_ISTXT
;
2026 * XXX p_dupfd is a real mess. It allows a device to return a
2027 * file descriptor to be duplicated rather then doing the open
2033 * Call vn_open() to do the lookup and assign the vnode to the
2034 * file pointer. vn_open() does not change the ref count on fp
2035 * and the vnode, on success, will be inherited by the file pointer
2038 * Request a shared lock on the vnode if possible.
2040 * Executable binaries can race VTEXT against O_RDWR opens, so
2041 * use an exclusive lock for O_RDWR opens as well.
2043 * NOTE: We need a flag to separate terminal vnode locking from
2044 * parent locking. O_CREAT needs parent locking, but O_TRUNC
2045 * and O_RDWR only need to lock the terminal vnode exclusively.
2047 nd
->nl_flags
|= NLC_LOCKVP
;
2048 if ((flags
& (O_CREAT
|O_TRUNC
|O_RDWR
)) == 0)
2049 nd
->nl_flags
|= NLC_SHAREDLOCK
;
2051 error
= vn_open(nd
, fp
, flags
, cmode
);
2056 * handle special fdopen() case. bleh. dupfdopen() is
2057 * responsible for dropping the old contents of ofiles[indx]
2060 * Note that fsetfd() will add a ref to fp which represents
2061 * the fd_files[] assignment. We must still drop our
2064 if ((error
== ENODEV
|| error
== ENXIO
) && lp
->lwp_dupfd
>= 0) {
2065 if (fdalloc(p
, 0, &indx
) == 0) {
2066 error
= dupfdopen(td
, indx
, lp
->lwp_dupfd
, flags
, error
);
2069 fdrop(fp
); /* our ref */
2072 fsetfd(fdp
, NULL
, indx
);
2075 fdrop(fp
); /* our ref */
2076 if (error
== ERESTART
)
2082 * ref the vnode for ourselves so it can't be ripped out from under
2083 * is. XXX need an ND flag to request that the vnode be returned
2086 * Reserve a file descriptor but do not assign it until the open
2089 vp
= (struct vnode
*)fp
->f_data
;
2091 if ((error
= fdalloc(p
, 0, &indx
)) != 0) {
2098 * If no error occurs the vp will have been assigned to the file
2103 if (flags
& (O_EXLOCK
| O_SHLOCK
)) {
2104 lf
.l_whence
= SEEK_SET
;
2107 if (flags
& O_EXLOCK
)
2108 lf
.l_type
= F_WRLCK
;
2110 lf
.l_type
= F_RDLCK
;
2111 if (flags
& FNONBLOCK
)
2116 if ((error
= VOP_ADVLOCK(vp
, (caddr_t
)fp
, F_SETLK
, &lf
, type
)) != 0) {
2118 * lock request failed. Clean up the reserved
2122 fsetfd(fdp
, NULL
, indx
);
2126 atomic_set_int(&fp
->f_flag
, FHASLOCK
); /* race ok */
2130 * Assert that all regular file vnodes were created with a object.
2132 KASSERT(vp
->v_type
!= VREG
|| vp
->v_object
!= NULL
,
2133 ("open: regular file has no backing object after vn_open"));
2139 * release our private reference, leaving the one associated with the
2140 * descriptor table intact.
2142 if (oflags
& O_CLOEXEC
)
2143 fdp
->fd_files
[indx
].fileflags
|= UF_EXCLOSE
;
2144 fsetfd(fdp
, fp
, indx
);
2152 * open_args(char *path, int flags, int mode)
2154 * Check permissions, allocate an open file structure,
2155 * and call the device open routine if any.
2158 sys_open(struct open_args
*uap
)
2160 struct nlookupdata nd
;
2163 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2165 error
= kern_open(&nd
, uap
->flags
,
2166 uap
->mode
, &uap
->sysmsg_result
);
2173 * openat_args(int fd, char *path, int flags, int mode)
2176 sys_openat(struct openat_args
*uap
)
2178 struct nlookupdata nd
;
2182 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
, UIO_USERSPACE
, 0);
2184 error
= kern_open(&nd
, uap
->flags
, uap
->mode
,
2185 &uap
->sysmsg_result
);
2187 nlookup_done_at(&nd
, fp
);
2192 kern_mknod(struct nlookupdata
*nd
, int mode
, int rmajor
, int rminor
)
2194 struct thread
*td
= curthread
;
2195 struct proc
*p
= td
->td_proc
;
2204 vattr
.va_mode
= (mode
& ALLPERMS
) &~ p
->p_fd
->fd_cmask
;
2205 vattr
.va_rmajor
= rmajor
;
2206 vattr
.va_rminor
= rminor
;
2208 switch (mode
& S_IFMT
) {
2209 case S_IFMT
: /* used by badsect to flag bad sectors */
2210 error
= priv_check_cred(td
->td_ucred
, PRIV_VFS_MKNOD_BAD
, 0);
2211 vattr
.va_type
= VBAD
;
2214 error
= priv_check(td
, PRIV_VFS_MKNOD_DEV
);
2215 vattr
.va_type
= VCHR
;
2218 error
= priv_check(td
, PRIV_VFS_MKNOD_DEV
);
2219 vattr
.va_type
= VBLK
;
2222 error
= priv_check_cred(td
->td_ucred
, PRIV_VFS_MKNOD_WHT
, 0);
2225 case S_IFDIR
: /* special directories support for HAMMER */
2226 error
= priv_check_cred(td
->td_ucred
, PRIV_VFS_MKNOD_DIR
, 0);
2227 vattr
.va_type
= VDIR
;
2238 nd
->nl_flags
|= NLC_CREATE
| NLC_REFDVP
;
2239 if ((error
= nlookup(nd
)) != 0)
2241 if (nd
->nl_nch
.ncp
->nc_vp
)
2243 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
2247 error
= VOP_NWHITEOUT(&nd
->nl_nch
, nd
->nl_dvp
,
2248 nd
->nl_cred
, NAMEI_CREATE
);
2251 error
= VOP_NMKNOD(&nd
->nl_nch
, nd
->nl_dvp
,
2252 &vp
, nd
->nl_cred
, &vattr
);
2260 * mknod_args(char *path, int mode, int dev)
2262 * Create a special file.
2265 sys_mknod(struct mknod_args
*uap
)
2267 struct nlookupdata nd
;
2270 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2272 error
= kern_mknod(&nd
, uap
->mode
,
2273 umajor(uap
->dev
), uminor(uap
->dev
));
2280 * mknodat_args(int fd, char *path, mode_t mode, dev_t dev)
2282 * Create a special file. The path is relative to the directory associated
2286 sys_mknodat(struct mknodat_args
*uap
)
2288 struct nlookupdata nd
;
2292 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
, UIO_USERSPACE
, 0);
2294 error
= kern_mknod(&nd
, uap
->mode
,
2295 umajor(uap
->dev
), uminor(uap
->dev
));
2297 nlookup_done_at(&nd
, fp
);
2302 kern_mkfifo(struct nlookupdata
*nd
, int mode
)
2304 struct thread
*td
= curthread
;
2305 struct proc
*p
= td
->td_proc
;
2312 nd
->nl_flags
|= NLC_CREATE
| NLC_REFDVP
;
2313 if ((error
= nlookup(nd
)) != 0)
2315 if (nd
->nl_nch
.ncp
->nc_vp
)
2317 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
2321 vattr
.va_type
= VFIFO
;
2322 vattr
.va_mode
= (mode
& ALLPERMS
) &~ p
->p_fd
->fd_cmask
;
2324 error
= VOP_NMKNOD(&nd
->nl_nch
, nd
->nl_dvp
, &vp
, nd
->nl_cred
, &vattr
);
2331 * mkfifo_args(char *path, int mode)
2333 * Create a named pipe.
2336 sys_mkfifo(struct mkfifo_args
*uap
)
2338 struct nlookupdata nd
;
2341 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2343 error
= kern_mkfifo(&nd
, uap
->mode
);
2349 * mkfifoat_args(int fd, char *path, mode_t mode)
2351 * Create a named pipe. The path is relative to the directory associated
2355 sys_mkfifoat(struct mkfifoat_args
*uap
)
2357 struct nlookupdata nd
;
2361 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
, UIO_USERSPACE
, 0);
2363 error
= kern_mkfifo(&nd
, uap
->mode
);
2364 nlookup_done_at(&nd
, fp
);
2368 static int hardlink_check_uid
= 0;
2369 SYSCTL_INT(_security
, OID_AUTO
, hardlink_check_uid
, CTLFLAG_RW
,
2370 &hardlink_check_uid
, 0,
2371 "Unprivileged processes cannot create hard links to files owned by other "
2373 static int hardlink_check_gid
= 0;
2374 SYSCTL_INT(_security
, OID_AUTO
, hardlink_check_gid
, CTLFLAG_RW
,
2375 &hardlink_check_gid
, 0,
2376 "Unprivileged processes cannot create hard links to files owned by other "
2380 can_hardlink(struct vnode
*vp
, struct thread
*td
, struct ucred
*cred
)
2386 * Shortcut if disabled
2388 if (hardlink_check_uid
== 0 && hardlink_check_gid
== 0)
2392 * Privileged user can always hardlink
2394 if (priv_check_cred(cred
, PRIV_VFS_LINK
, 0) == 0)
2398 * Otherwise only if the originating file is owned by the
2399 * same user or group. Note that any group is allowed if
2400 * the file is owned by the caller.
2402 error
= VOP_GETATTR(vp
, &va
);
2406 if (hardlink_check_uid
) {
2407 if (cred
->cr_uid
!= va
.va_uid
)
2411 if (hardlink_check_gid
) {
2412 if (cred
->cr_uid
!= va
.va_uid
&& !groupmember(va
.va_gid
, cred
))
2420 kern_link(struct nlookupdata
*nd
, struct nlookupdata
*linknd
)
2422 struct thread
*td
= curthread
;
2427 * Lookup the source and obtained a locked vnode.
2429 * You may only hardlink a file which you have write permission
2430 * on or which you own.
2432 * XXX relookup on vget failure / race ?
2435 nd
->nl_flags
|= NLC_WRITE
| NLC_OWN
| NLC_HLINK
;
2436 if ((error
= nlookup(nd
)) != 0)
2438 vp
= nd
->nl_nch
.ncp
->nc_vp
;
2439 KKASSERT(vp
!= NULL
);
2440 if (vp
->v_type
== VDIR
)
2441 return (EPERM
); /* POSIX */
2442 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
2444 if ((error
= vget(vp
, LK_EXCLUSIVE
)) != 0)
2448 * Unlock the source so we can lookup the target without deadlocking
2449 * (XXX vp is locked already, possible other deadlock?). The target
2452 KKASSERT(nd
->nl_flags
& NLC_NCPISLOCKED
);
2453 nd
->nl_flags
&= ~NLC_NCPISLOCKED
;
2454 cache_unlock(&nd
->nl_nch
);
2457 linknd
->nl_flags
|= NLC_CREATE
| NLC_REFDVP
;
2458 if ((error
= nlookup(linknd
)) != 0) {
2462 if (linknd
->nl_nch
.ncp
->nc_vp
) {
2466 VFS_MODIFYING(vp
->v_mount
);
2467 error
= vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
| LK_FAILRECLAIM
);
2474 * Finally run the new API VOP.
2476 error
= can_hardlink(vp
, td
, td
->td_ucred
);
2478 error
= VOP_NLINK(&linknd
->nl_nch
, linknd
->nl_dvp
,
2479 vp
, linknd
->nl_cred
);
2486 * link_args(char *path, char *link)
2488 * Make a hard file link.
2491 sys_link(struct link_args
*uap
)
2493 struct nlookupdata nd
, linknd
;
2496 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
2498 error
= nlookup_init(&linknd
, uap
->link
, UIO_USERSPACE
, 0);
2500 error
= kern_link(&nd
, &linknd
);
2501 nlookup_done(&linknd
);
2508 * linkat_args(int fd1, char *path1, int fd2, char *path2, int flags)
2510 * Make a hard file link. The path1 argument is relative to the directory
2511 * associated with fd1, and similarly the path2 argument is relative to
2512 * the directory associated with fd2.
2515 sys_linkat(struct linkat_args
*uap
)
2517 struct nlookupdata nd
, linknd
;
2518 struct file
*fp1
, *fp2
;
2521 error
= nlookup_init_at(&nd
, &fp1
, uap
->fd1
, uap
->path1
, UIO_USERSPACE
,
2522 (uap
->flags
& AT_SYMLINK_FOLLOW
) ? NLC_FOLLOW
: 0);
2524 error
= nlookup_init_at(&linknd
, &fp2
, uap
->fd2
,
2525 uap
->path2
, UIO_USERSPACE
, 0);
2527 error
= kern_link(&nd
, &linknd
);
2528 nlookup_done_at(&linknd
, fp2
);
2530 nlookup_done_at(&nd
, fp1
);
2535 kern_symlink(struct nlookupdata
*nd
, char *path
, int mode
)
2543 nd
->nl_flags
|= NLC_CREATE
| NLC_REFDVP
;
2544 if ((error
= nlookup(nd
)) != 0)
2546 if (nd
->nl_nch
.ncp
->nc_vp
)
2548 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
2552 vattr
.va_mode
= mode
;
2553 error
= VOP_NSYMLINK(&nd
->nl_nch
, dvp
, &vp
, nd
->nl_cred
, &vattr
, path
);
2560 * symlink(char *path, char *link)
2562 * Make a symbolic link.
2565 sys_symlink(struct symlink_args
*uap
)
2567 struct thread
*td
= curthread
;
2568 struct nlookupdata nd
;
2573 path
= objcache_get(namei_oc
, M_WAITOK
);
2574 error
= copyinstr(uap
->path
, path
, MAXPATHLEN
, NULL
);
2576 error
= nlookup_init(&nd
, uap
->link
, UIO_USERSPACE
, 0);
2578 mode
= ACCESSPERMS
& ~td
->td_proc
->p_fd
->fd_cmask
;
2579 error
= kern_symlink(&nd
, path
, mode
);
2583 objcache_put(namei_oc
, path
);
2588 * symlinkat_args(char *path1, int fd, char *path2)
2590 * Make a symbolic link. The path2 argument is relative to the directory
2591 * associated with fd.
2594 sys_symlinkat(struct symlinkat_args
*uap
)
2596 struct thread
*td
= curthread
;
2597 struct nlookupdata nd
;
2603 path1
= objcache_get(namei_oc
, M_WAITOK
);
2604 error
= copyinstr(uap
->path1
, path1
, MAXPATHLEN
, NULL
);
2606 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path2
,
2609 mode
= ACCESSPERMS
& ~td
->td_proc
->p_fd
->fd_cmask
;
2610 error
= kern_symlink(&nd
, path1
, mode
);
2612 nlookup_done_at(&nd
, fp
);
2614 objcache_put(namei_oc
, path1
);
2619 * undelete_args(char *path)
2621 * Delete a whiteout from the filesystem.
2624 sys_undelete(struct undelete_args
*uap
)
2626 struct nlookupdata nd
;
2629 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2631 nd
.nl_flags
|= NLC_DELETE
| NLC_REFDVP
;
2633 error
= nlookup(&nd
);
2635 error
= ncp_writechk(&nd
.nl_nch
);
2637 error
= VOP_NWHITEOUT(&nd
.nl_nch
, nd
.nl_dvp
, nd
.nl_cred
,
2645 kern_unlink(struct nlookupdata
*nd
)
2650 nd
->nl_flags
|= NLC_DELETE
| NLC_REFDVP
;
2651 if ((error
= nlookup(nd
)) != 0)
2653 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
2655 error
= VOP_NREMOVE(&nd
->nl_nch
, nd
->nl_dvp
, nd
->nl_cred
);
2660 * unlink_args(char *path)
2662 * Delete a name from the filesystem.
2665 sys_unlink(struct unlink_args
*uap
)
2667 struct nlookupdata nd
;
2670 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2672 error
= kern_unlink(&nd
);
2679 * unlinkat_args(int fd, char *path, int flags)
2681 * Delete the file or directory entry pointed to by fd/path.
2684 sys_unlinkat(struct unlinkat_args
*uap
)
2686 struct nlookupdata nd
;
2690 if (uap
->flags
& ~AT_REMOVEDIR
)
2693 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
, UIO_USERSPACE
, 0);
2695 if (uap
->flags
& AT_REMOVEDIR
)
2696 error
= kern_rmdir(&nd
);
2698 error
= kern_unlink(&nd
);
2700 nlookup_done_at(&nd
, fp
);
2705 kern_lseek(int fd
, off_t offset
, int whence
, off_t
*res
)
2707 struct thread
*td
= curthread
;
2714 fp
= holdfp(td
, fd
, -1);
2717 if (fp
->f_type
!= DTYPE_VNODE
) {
2721 vp
= (struct vnode
*)fp
->f_data
;
2725 spin_lock(&fp
->f_spin
);
2726 new_offset
= fp
->f_offset
+ offset
;
2730 error
= VOP_GETATTR(vp
, &vattr
);
2731 spin_lock(&fp
->f_spin
);
2732 new_offset
= offset
+ vattr
.va_size
;
2735 new_offset
= offset
;
2737 spin_lock(&fp
->f_spin
);
2742 spin_lock(&fp
->f_spin
);
2747 * Validate the seek position. Negative offsets are not allowed
2748 * for regular files or directories.
2750 * Normally we would also not want to allow negative offsets for
2751 * character and block-special devices. However kvm addresses
2752 * on 64 bit architectures might appear to be negative and must
2756 if (new_offset
< 0 &&
2757 (vp
->v_type
== VREG
|| vp
->v_type
== VDIR
)) {
2760 fp
->f_offset
= new_offset
;
2763 *res
= fp
->f_offset
;
2764 spin_unlock(&fp
->f_spin
);
2772 * lseek_args(int fd, int pad, off_t offset, int whence)
2774 * Reposition read/write file offset.
2777 sys_lseek(struct lseek_args
*uap
)
2781 error
= kern_lseek(uap
->fd
, uap
->offset
, uap
->whence
,
2782 &uap
->sysmsg_offset
);
2788 * Check if current process can access given file. amode is a bitmask of *_OK
2789 * access bits. flags is a bitmask of AT_* flags.
2792 kern_access(struct nlookupdata
*nd
, int amode
, int flags
)
2797 if (flags
& ~AT_EACCESS
)
2799 nd
->nl_flags
|= NLC_SHAREDLOCK
;
2800 if ((error
= nlookup(nd
)) != 0)
2803 error
= cache_vget(&nd
->nl_nch
, nd
->nl_cred
, LK_SHARED
, &vp
);
2807 /* Flags == 0 means only check for existence. */
2816 if ((mode
& VWRITE
) == 0 ||
2817 (error
= vn_writechk(vp
, &nd
->nl_nch
)) == 0)
2818 error
= VOP_ACCESS_FLAGS(vp
, mode
, flags
, nd
->nl_cred
);
2821 * If the file handle is stale we have to re-resolve the
2822 * entry with the ncp held exclusively. This is a hack
2825 if (error
== ESTALE
) {
2827 cache_unlock(&nd
->nl_nch
);
2828 cache_lock(&nd
->nl_nch
);
2829 cache_setunresolved(&nd
->nl_nch
);
2830 error
= cache_resolve(&nd
->nl_nch
, nd
->nl_cred
);
2843 * access_args(char *path, int flags)
2845 * Check access permissions.
2848 sys_access(struct access_args
*uap
)
2850 struct nlookupdata nd
;
2853 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
2855 error
= kern_access(&nd
, uap
->flags
, 0);
2862 * eaccess_args(char *path, int flags)
2864 * Check access permissions.
2867 sys_eaccess(struct eaccess_args
*uap
)
2869 struct nlookupdata nd
;
2872 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
2874 error
= kern_access(&nd
, uap
->flags
, AT_EACCESS
);
2881 * faccessat_args(int fd, char *path, int amode, int flags)
2883 * Check access permissions.
2886 sys_faccessat(struct faccessat_args
*uap
)
2888 struct nlookupdata nd
;
2892 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
, UIO_USERSPACE
,
2895 error
= kern_access(&nd
, uap
->amode
, uap
->flags
);
2896 nlookup_done_at(&nd
, fp
);
2901 kern_stat(struct nlookupdata
*nd
, struct stat
*st
)
2906 nd
->nl_flags
|= NLC_SHAREDLOCK
;
2907 if ((error
= nlookup(nd
)) != 0)
2910 if ((vp
= nd
->nl_nch
.ncp
->nc_vp
) == NULL
)
2913 if ((error
= vget(vp
, LK_SHARED
)) != 0)
2915 error
= vn_stat(vp
, st
, nd
->nl_cred
);
2918 * If the file handle is stale we have to re-resolve the
2919 * entry with the ncp held exclusively. This is a hack
2922 if (error
== ESTALE
) {
2924 cache_unlock(&nd
->nl_nch
);
2925 cache_lock(&nd
->nl_nch
);
2926 cache_setunresolved(&nd
->nl_nch
);
2927 error
= cache_resolve(&nd
->nl_nch
, nd
->nl_cred
);
2937 * stat_args(char *path, struct stat *ub)
2939 * Get file status; this version follows links.
2942 sys_stat(struct stat_args
*uap
)
2944 struct nlookupdata nd
;
2948 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
2950 error
= kern_stat(&nd
, &st
);
2952 error
= copyout(&st
, uap
->ub
, sizeof(*uap
->ub
));
2959 * lstat_args(char *path, struct stat *ub)
2961 * Get file status; this version does not follow links.
2964 sys_lstat(struct lstat_args
*uap
)
2966 struct nlookupdata nd
;
2970 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
2972 error
= kern_stat(&nd
, &st
);
2974 error
= copyout(&st
, uap
->ub
, sizeof(*uap
->ub
));
2981 * fstatat_args(int fd, char *path, struct stat *sb, int flags)
2983 * Get status of file pointed to by fd/path.
2986 sys_fstatat(struct fstatat_args
*uap
)
2988 struct nlookupdata nd
;
2994 if (uap
->flags
& ~AT_SYMLINK_NOFOLLOW
)
2997 flags
= (uap
->flags
& AT_SYMLINK_NOFOLLOW
) ? 0 : NLC_FOLLOW
;
2999 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
,
3000 UIO_USERSPACE
, flags
);
3002 error
= kern_stat(&nd
, &st
);
3004 error
= copyout(&st
, uap
->sb
, sizeof(*uap
->sb
));
3006 nlookup_done_at(&nd
, fp
);
3011 kern_pathconf(char *path
, int name
, int flags
, register_t
*sysmsg_regp
)
3013 struct nlookupdata nd
;
3018 error
= nlookup_init(&nd
, path
, UIO_USERSPACE
, flags
);
3020 error
= nlookup(&nd
);
3022 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_EXCLUSIVE
, &vp
);
3025 error
= VOP_PATHCONF(vp
, name
, sysmsg_regp
);
3032 * pathconf_Args(char *path, int name)
3034 * Get configurable pathname variables.
3037 sys_pathconf(struct pathconf_args
*uap
)
3039 return (kern_pathconf(uap
->path
, uap
->name
, NLC_FOLLOW
,
3044 * lpathconf_Args(char *path, int name)
3046 * Get configurable pathname variables, but don't follow symlinks.
3049 sys_lpathconf(struct lpathconf_args
*uap
)
3051 return (kern_pathconf(uap
->path
, uap
->name
, 0, &uap
->sysmsg_reg
));
3056 * kern_readlink isn't properly split yet. There is a copyin burried
3057 * in VOP_READLINK().
3060 kern_readlink(struct nlookupdata
*nd
, char *buf
, int count
, int *res
)
3062 struct thread
*td
= curthread
;
3068 nd
->nl_flags
|= NLC_SHAREDLOCK
;
3069 if ((error
= nlookup(nd
)) != 0)
3071 error
= cache_vget(&nd
->nl_nch
, nd
->nl_cred
, LK_SHARED
, &vp
);
3074 if (vp
->v_type
!= VLNK
) {
3077 aiov
.iov_base
= buf
;
3078 aiov
.iov_len
= count
;
3079 auio
.uio_iov
= &aiov
;
3080 auio
.uio_iovcnt
= 1;
3081 auio
.uio_offset
= 0;
3082 auio
.uio_rw
= UIO_READ
;
3083 auio
.uio_segflg
= UIO_USERSPACE
;
3085 auio
.uio_resid
= count
;
3086 error
= VOP_READLINK(vp
, &auio
, td
->td_ucred
);
3089 *res
= count
- auio
.uio_resid
;
3094 * readlink_args(char *path, char *buf, int count)
3096 * Return target name of a symbolic link.
3099 sys_readlink(struct readlink_args
*uap
)
3101 struct nlookupdata nd
;
3104 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
3106 error
= kern_readlink(&nd
, uap
->buf
, uap
->count
,
3107 &uap
->sysmsg_result
);
3114 * readlinkat_args(int fd, char *path, char *buf, size_t bufsize)
3116 * Return target name of a symbolic link. The path is relative to the
3117 * directory associated with fd.
3120 sys_readlinkat(struct readlinkat_args
*uap
)
3122 struct nlookupdata nd
;
3126 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
, UIO_USERSPACE
, 0);
3128 error
= kern_readlink(&nd
, uap
->buf
, uap
->bufsize
,
3129 &uap
->sysmsg_result
);
3131 nlookup_done_at(&nd
, fp
);
3136 setfflags(struct vnode
*vp
, int flags
)
3138 struct thread
*td
= curthread
;
3143 * Prevent non-root users from setting flags on devices. When
3144 * a device is reused, users can retain ownership of the device
3145 * if they are allowed to set flags and programs assume that
3146 * chown can't fail when done as root.
3148 if ((vp
->v_type
== VCHR
|| vp
->v_type
== VBLK
) &&
3149 ((error
= priv_check_cred(td
->td_ucred
, PRIV_VFS_CHFLAGS_DEV
, 0)) != 0))
3153 * note: vget is required for any operation that might mod the vnode
3154 * so VINACTIVE is properly cleared.
3156 if ((error
= vget(vp
, LK_EXCLUSIVE
)) == 0) {
3158 vattr
.va_flags
= flags
;
3159 error
= VOP_SETATTR(vp
, &vattr
, td
->td_ucred
);
3166 * chflags(char *path, int flags)
3168 * Change flags of a file given a path name.
3171 sys_chflags(struct chflags_args
*uap
)
3173 struct nlookupdata nd
;
3178 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
3180 error
= nlookup(&nd
);
3182 error
= ncp_writechk(&nd
.nl_nch
);
3184 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
3187 error
= setfflags(vp
, uap
->flags
);
3194 * lchflags(char *path, int flags)
3196 * Change flags of a file given a path name, but don't follow symlinks.
3199 sys_lchflags(struct lchflags_args
*uap
)
3201 struct nlookupdata nd
;
3206 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
3208 error
= nlookup(&nd
);
3210 error
= ncp_writechk(&nd
.nl_nch
);
3212 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
3215 error
= setfflags(vp
, uap
->flags
);
3222 * fchflags_args(int fd, int flags)
3224 * Change flags of a file given a file descriptor.
3227 sys_fchflags(struct fchflags_args
*uap
)
3229 struct thread
*td
= curthread
;
3233 if ((error
= holdvnode(td
, uap
->fd
, &fp
)) != 0)
3235 if (fp
->f_nchandle
.ncp
)
3236 error
= ncp_writechk(&fp
->f_nchandle
);
3238 error
= setfflags((struct vnode
*) fp
->f_data
, uap
->flags
);
3244 * chflagsat_args(int fd, const char *path, int flags, int atflags)
3245 * change flags given a pathname relative to a filedescriptor
3247 int sys_chflagsat(struct chflagsat_args
*uap
)
3249 struct nlookupdata nd
;
3255 if (uap
->atflags
& ~AT_SYMLINK_NOFOLLOW
)
3258 lookupflags
= (uap
->atflags
& AT_SYMLINK_NOFOLLOW
) ? 0 : NLC_FOLLOW
;
3261 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
, UIO_USERSPACE
, lookupflags
);
3263 error
= nlookup(&nd
);
3265 error
= ncp_writechk(&nd
.nl_nch
);
3267 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
3268 nlookup_done_at(&nd
, fp
);
3270 error
= setfflags(vp
, uap
->flags
);
3278 setfmode(struct vnode
*vp
, int mode
)
3280 struct thread
*td
= curthread
;
3285 * note: vget is required for any operation that might mod the vnode
3286 * so VINACTIVE is properly cleared.
3288 if ((error
= vget(vp
, LK_EXCLUSIVE
)) == 0) {
3290 vattr
.va_mode
= mode
& ALLPERMS
;
3291 error
= VOP_SETATTR(vp
, &vattr
, td
->td_ucred
);
3292 cache_inval_wxok(vp
);
3299 kern_chmod(struct nlookupdata
*nd
, int mode
)
3304 if ((error
= nlookup(nd
)) != 0)
3306 if ((error
= cache_vref(&nd
->nl_nch
, nd
->nl_cred
, &vp
)) != 0)
3308 if ((error
= ncp_writechk(&nd
->nl_nch
)) == 0)
3309 error
= setfmode(vp
, mode
);
3315 * chmod_args(char *path, int mode)
3317 * Change mode of a file given path name.
3320 sys_chmod(struct chmod_args
*uap
)
3322 struct nlookupdata nd
;
3325 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
3327 error
= kern_chmod(&nd
, uap
->mode
);
3333 * lchmod_args(char *path, int mode)
3335 * Change mode of a file given path name (don't follow links.)
3338 sys_lchmod(struct lchmod_args
*uap
)
3340 struct nlookupdata nd
;
3343 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
3345 error
= kern_chmod(&nd
, uap
->mode
);
3351 * fchmod_args(int fd, int mode)
3353 * Change mode of a file given a file descriptor.
3356 sys_fchmod(struct fchmod_args
*uap
)
3358 struct thread
*td
= curthread
;
3362 if ((error
= holdvnode(td
, uap
->fd
, &fp
)) != 0)
3364 if (fp
->f_nchandle
.ncp
)
3365 error
= ncp_writechk(&fp
->f_nchandle
);
3367 error
= setfmode((struct vnode
*)fp
->f_data
, uap
->mode
);
3373 * fchmodat_args(char *path, int mode)
3375 * Change mode of a file pointed to by fd/path.
3378 sys_fchmodat(struct fchmodat_args
*uap
)
3380 struct nlookupdata nd
;
3385 if (uap
->flags
& ~AT_SYMLINK_NOFOLLOW
)
3387 flags
= (uap
->flags
& AT_SYMLINK_NOFOLLOW
) ? 0 : NLC_FOLLOW
;
3389 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
,
3390 UIO_USERSPACE
, flags
);
3392 error
= kern_chmod(&nd
, uap
->mode
);
3393 nlookup_done_at(&nd
, fp
);
3398 setfown(struct mount
*mp
, struct vnode
*vp
, uid_t uid
, gid_t gid
)
3400 struct thread
*td
= curthread
;
3408 * note: vget is required for any operation that might mod the vnode
3409 * so VINACTIVE is properly cleared.
3411 if ((error
= vget(vp
, LK_EXCLUSIVE
)) == 0) {
3412 if ((error
= VOP_GETATTR(vp
, &vattr
)) != 0)
3414 o_uid
= vattr
.va_uid
;
3415 o_gid
= vattr
.va_gid
;
3416 size
= vattr
.va_size
;
3421 error
= VOP_SETATTR(vp
, &vattr
, td
->td_ucred
);
3430 VFS_ACCOUNT(mp
, o_uid
, o_gid
, -size
);
3431 VFS_ACCOUNT(mp
, uid
, gid
, size
);
3438 kern_chown(struct nlookupdata
*nd
, int uid
, int gid
)
3443 if ((error
= nlookup(nd
)) != 0)
3445 if ((error
= cache_vref(&nd
->nl_nch
, nd
->nl_cred
, &vp
)) != 0)
3447 if ((error
= ncp_writechk(&nd
->nl_nch
)) == 0)
3448 error
= setfown(nd
->nl_nch
.mount
, vp
, uid
, gid
);
3454 * chown(char *path, int uid, int gid)
3456 * Set ownership given a path name.
3459 sys_chown(struct chown_args
*uap
)
3461 struct nlookupdata nd
;
3464 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
3466 error
= kern_chown(&nd
, uap
->uid
, uap
->gid
);
3472 * lchown_args(char *path, int uid, int gid)
3474 * Set ownership given a path name, do not cross symlinks.
3477 sys_lchown(struct lchown_args
*uap
)
3479 struct nlookupdata nd
;
3482 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
3484 error
= kern_chown(&nd
, uap
->uid
, uap
->gid
);
3490 * fchown_args(int fd, int uid, int gid)
3492 * Set ownership given a file descriptor.
3495 sys_fchown(struct fchown_args
*uap
)
3497 struct thread
*td
= curthread
;
3498 struct proc
*p
= td
->td_proc
;
3502 if ((error
= holdvnode(td
, uap
->fd
, &fp
)) != 0)
3504 if (fp
->f_nchandle
.ncp
)
3505 error
= ncp_writechk(&fp
->f_nchandle
);
3507 error
= setfown(p
->p_fd
->fd_ncdir
.mount
,
3508 (struct vnode
*)fp
->f_data
, uap
->uid
, uap
->gid
);
3514 * fchownat(int fd, char *path, int uid, int gid, int flags)
3516 * Set ownership of file pointed to by fd/path.
3519 sys_fchownat(struct fchownat_args
*uap
)
3521 struct nlookupdata nd
;
3526 if (uap
->flags
& ~AT_SYMLINK_NOFOLLOW
)
3528 flags
= (uap
->flags
& AT_SYMLINK_NOFOLLOW
) ? 0 : NLC_FOLLOW
;
3530 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
,
3531 UIO_USERSPACE
, flags
);
3533 error
= kern_chown(&nd
, uap
->uid
, uap
->gid
);
3534 nlookup_done_at(&nd
, fp
);
3540 getutimes(struct timeval
*tvp
, struct timespec
*tsp
)
3542 struct timeval tv
[2];
3547 TIMEVAL_TO_TIMESPEC(&tv
[0], &tsp
[0]);
3550 if ((error
= itimerfix(tvp
)) != 0)
3552 TIMEVAL_TO_TIMESPEC(&tvp
[0], &tsp
[0]);
3553 TIMEVAL_TO_TIMESPEC(&tvp
[1], &tsp
[1]);
3559 getutimens(const struct timespec
*ts
, struct timespec
*newts
, int *nullflag
)
3561 struct timespec tsnow
;
3575 if (newts
[0].tv_nsec
== UTIME_OMIT
&& newts
[1].tv_nsec
== UTIME_OMIT
)
3577 if (newts
[0].tv_nsec
== UTIME_NOW
&& newts
[1].tv_nsec
== UTIME_NOW
)
3580 if (newts
[0].tv_nsec
== UTIME_OMIT
)
3581 newts
[0].tv_sec
= VNOVAL
;
3582 else if (newts
[0].tv_nsec
== UTIME_NOW
)
3584 else if ((error
= itimespecfix(&newts
[0])) != 0)
3587 if (newts
[1].tv_nsec
== UTIME_OMIT
)
3588 newts
[1].tv_sec
= VNOVAL
;
3589 else if (newts
[1].tv_nsec
== UTIME_NOW
)
3591 else if ((error
= itimespecfix(&newts
[1])) != 0)
3598 setutimes(struct vnode
*vp
, struct vattr
*vattr
,
3599 const struct timespec
*ts
, int nullflag
)
3601 struct thread
*td
= curthread
;
3605 vattr
->va_atime
= ts
[0];
3606 vattr
->va_mtime
= ts
[1];
3608 vattr
->va_vaflags
|= VA_UTIMES_NULL
;
3609 error
= VOP_SETATTR(vp
, vattr
, td
->td_ucred
);
3615 kern_utimes(struct nlookupdata
*nd
, struct timeval
*tptr
)
3617 struct timespec ts
[2];
3621 if ((error
= getutimes(tptr
, ts
)) != 0)
3624 error
= kern_utimensat(nd
, tptr
? ts
: NULL
, 0);
3629 * utimes_args(char *path, struct timeval *tptr)
3631 * Set the access and modification times of a file.
3634 sys_utimes(struct utimes_args
*uap
)
3636 struct timeval tv
[2];
3637 struct nlookupdata nd
;
3641 error
= copyin(uap
->tptr
, tv
, sizeof(tv
));
3645 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
3647 error
= kern_utimes(&nd
, uap
->tptr
? tv
: NULL
);
3653 * lutimes_args(char *path, struct timeval *tptr)
3655 * Set the access and modification times of a file.
3658 sys_lutimes(struct lutimes_args
*uap
)
3660 struct timeval tv
[2];
3661 struct nlookupdata nd
;
3665 error
= copyin(uap
->tptr
, tv
, sizeof(tv
));
3669 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
3671 error
= kern_utimes(&nd
, uap
->tptr
? tv
: NULL
);
3677 * Set utimes on a file descriptor. The creds used to open the
3678 * file are used to determine whether the operation is allowed
3682 kern_futimens(int fd
, struct timespec
*ts
)
3684 struct thread
*td
= curthread
;
3685 struct timespec newts
[2];
3692 error
= getutimens(ts
, newts
, &nullflag
);
3695 if ((error
= holdvnode(td
, fd
, &fp
)) != 0)
3697 if (fp
->f_nchandle
.ncp
)
3698 error
= ncp_writechk(&fp
->f_nchandle
);
3701 error
= vget(vp
, LK_EXCLUSIVE
);
3703 error
= VOP_GETATTR(vp
, &vattr
);
3705 error
= naccess_va(&vattr
, NLC_OWN
| NLC_WRITE
,
3709 error
= setutimes(vp
, &vattr
, newts
, nullflag
);
3719 * futimens_args(int fd, struct timespec *ts)
3721 * Set the access and modification times of a file.
3724 sys_futimens(struct futimens_args
*uap
)
3726 struct timespec ts
[2];
3730 error
= copyin(uap
->ts
, ts
, sizeof(ts
));
3734 error
= kern_futimens(uap
->fd
, uap
->ts
? ts
: NULL
);
3739 kern_futimes(int fd
, struct timeval
*tptr
)
3741 struct timespec ts
[2];
3745 if ((error
= getutimes(tptr
, ts
)) != 0)
3748 error
= kern_futimens(fd
, tptr
? ts
: NULL
);
3753 * futimes_args(int fd, struct timeval *tptr)
3755 * Set the access and modification times of a file.
3758 sys_futimes(struct futimes_args
*uap
)
3760 struct timeval tv
[2];
3764 error
= copyin(uap
->tptr
, tv
, sizeof(tv
));
3768 error
= kern_futimes(uap
->fd
, uap
->tptr
? tv
: NULL
);
3773 kern_utimensat(struct nlookupdata
*nd
, const struct timespec
*ts
, int flags
)
3775 struct timespec newts
[2];
3781 if (flags
& ~AT_SYMLINK_NOFOLLOW
)
3784 error
= getutimens(ts
, newts
, &nullflag
);
3788 nd
->nl_flags
|= NLC_OWN
| NLC_WRITE
;
3789 if ((error
= nlookup(nd
)) != 0)
3791 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
3793 if ((error
= cache_vref(&nd
->nl_nch
, nd
->nl_cred
, &vp
)) != 0)
3795 if ((error
= vn_writechk(vp
, &nd
->nl_nch
)) == 0) {
3796 error
= vget(vp
, LK_EXCLUSIVE
);
3798 error
= setutimes(vp
, &vattr
, newts
, nullflag
);
3807 * utimensat_args(int fd, const char *path, const struct timespec *ts, int flags);
3809 * Set file access and modification times of a file.
3812 sys_utimensat(struct utimensat_args
*uap
)
3814 struct timespec ts
[2];
3815 struct nlookupdata nd
;
3821 error
= copyin(uap
->ts
, ts
, sizeof(ts
));
3826 flags
= (uap
->flags
& AT_SYMLINK_NOFOLLOW
) ? 0 : NLC_FOLLOW
;
3827 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
,
3828 UIO_USERSPACE
, flags
);
3830 error
= kern_utimensat(&nd
, uap
->ts
? ts
: NULL
, uap
->flags
);
3831 nlookup_done_at(&nd
, fp
);
3836 kern_truncate(struct nlookupdata
*nd
, off_t length
)
3843 uint64_t old_size
= 0;
3847 nd
->nl_flags
|= NLC_WRITE
| NLC_TRUNCATE
;
3848 if ((error
= nlookup(nd
)) != 0)
3850 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
3852 if ((error
= cache_vref(&nd
->nl_nch
, nd
->nl_cred
, &vp
)) != 0)
3854 error
= vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
| LK_FAILRECLAIM
);
3859 if (vp
->v_type
== VDIR
) {
3863 if (vfs_quota_enabled
) {
3864 error
= VOP_GETATTR(vp
, &vattr
);
3865 KASSERT(error
== 0, ("kern_truncate(): VOP_GETATTR didn't return 0"));
3868 old_size
= vattr
.va_size
;
3871 if ((error
= vn_writechk(vp
, &nd
->nl_nch
)) == 0) {
3873 vattr
.va_size
= length
;
3874 error
= VOP_SETATTR(vp
, &vattr
, nd
->nl_cred
);
3875 VFS_ACCOUNT(nd
->nl_nch
.mount
, uid
, gid
, length
- old_size
);
3883 * truncate(char *path, int pad, off_t length)
3885 * Truncate a file given its path name.
3888 sys_truncate(struct truncate_args
*uap
)
3890 struct nlookupdata nd
;
3893 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
3895 error
= kern_truncate(&nd
, uap
->length
);
3901 kern_ftruncate(int fd
, off_t length
)
3903 struct thread
*td
= curthread
;
3910 uint64_t old_size
= 0;
3915 if ((error
= holdvnode(td
, fd
, &fp
)) != 0)
3917 if (fp
->f_nchandle
.ncp
) {
3918 error
= ncp_writechk(&fp
->f_nchandle
);
3922 if ((fp
->f_flag
& FWRITE
) == 0) {
3926 if (fp
->f_flag
& FAPPENDONLY
) { /* inode was set s/uapnd */
3930 vp
= (struct vnode
*)fp
->f_data
;
3931 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
3932 if (vp
->v_type
== VDIR
) {
3938 if (vfs_quota_enabled
) {
3939 error
= VOP_GETATTR(vp
, &vattr
);
3940 KASSERT(error
== 0, ("kern_ftruncate(): VOP_GETATTR didn't return 0"));
3943 old_size
= vattr
.va_size
;
3946 if ((error
= vn_writechk(vp
, NULL
)) == 0) {
3948 vattr
.va_size
= length
;
3949 error
= VOP_SETATTR(vp
, &vattr
, fp
->f_cred
);
3951 VFS_ACCOUNT(mp
, uid
, gid
, length
- old_size
);
3960 * ftruncate_args(int fd, int pad, off_t length)
3962 * Truncate a file given a file descriptor.
3965 sys_ftruncate(struct ftruncate_args
*uap
)
3969 error
= kern_ftruncate(uap
->fd
, uap
->length
);
3977 * Sync an open file.
3980 sys_fsync(struct fsync_args
*uap
)
3982 struct thread
*td
= curthread
;
3988 if ((error
= holdvnode(td
, uap
->fd
, &fp
)) != 0)
3990 vp
= (struct vnode
*)fp
->f_data
;
3991 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
3992 if ((obj
= vp
->v_object
) != NULL
) {
3993 if (vp
->v_mount
== NULL
||
3994 (vp
->v_mount
->mnt_kern_flag
& MNTK_NOMSYNC
) == 0) {
3995 vm_object_page_clean(obj
, 0, 0, 0);
3998 error
= VOP_FSYNC(vp
, MNT_WAIT
, VOP_FSYNC_SYSCALL
);
3999 if (error
== 0 && vp
->v_mount
)
4000 error
= buf_fsync(vp
);
4008 kern_rename(struct nlookupdata
*fromnd
, struct nlookupdata
*tond
)
4010 struct nchandle fnchd
;
4011 struct nchandle tnchd
;
4012 struct namecache
*ncp
;
4021 fromnd
->nl_flags
|= NLC_REFDVP
| NLC_RENAME_SRC
;
4022 if ((error
= nlookup(fromnd
)) != 0)
4024 if ((fnchd
.ncp
= fromnd
->nl_nch
.ncp
->nc_parent
) == NULL
)
4026 fnchd
.mount
= fromnd
->nl_nch
.mount
;
4030 * unlock the source nch so we can lookup the target nch without
4031 * deadlocking. The target may or may not exist so we do not check
4032 * for a target vp like kern_mkdir() and other creation functions do.
4034 * The source and target directories are ref'd and rechecked after
4035 * everything is relocked to determine if the source or target file
4038 KKASSERT(fromnd
->nl_flags
& NLC_NCPISLOCKED
);
4039 fromnd
->nl_flags
&= ~NLC_NCPISLOCKED
;
4041 fncp_gen
= fromnd
->nl_nch
.ncp
->nc_generation
;
4043 cache_unlock(&fromnd
->nl_nch
);
4045 tond
->nl_flags
|= NLC_RENAME_DST
| NLC_REFDVP
;
4046 if ((error
= nlookup(tond
)) != 0) {
4050 tncp_gen
= tond
->nl_nch
.ncp
->nc_generation
;
4052 if ((tnchd
.ncp
= tond
->nl_nch
.ncp
->nc_parent
) == NULL
) {
4056 tnchd
.mount
= tond
->nl_nch
.mount
;
4060 * If the source and target are the same there is nothing to do
4062 if (fromnd
->nl_nch
.ncp
== tond
->nl_nch
.ncp
) {
4069 * Mount points cannot be renamed or overwritten
4071 if ((fromnd
->nl_nch
.ncp
->nc_flag
| tond
->nl_nch
.ncp
->nc_flag
) &
4080 * Relock the source ncp. cache_relock() will deal with any
4081 * deadlocks against the already-locked tond and will also
4082 * make sure both are resolved.
4084 * NOTE AFTER RELOCKING: The source or target ncp may have become
4085 * invalid while they were unlocked, nc_vp and nc_mount could
4088 cache_relock(&fromnd
->nl_nch
, fromnd
->nl_cred
,
4089 &tond
->nl_nch
, tond
->nl_cred
);
4090 fromnd
->nl_flags
|= NLC_NCPISLOCKED
;
4093 * If the namecache generation changed for either fromnd or tond,
4096 if (fromnd
->nl_nch
.ncp
->nc_generation
!= fncp_gen
||
4097 tond
->nl_nch
.ncp
->nc_generation
!= tncp_gen
) {
4098 kprintf("kern_rename: retry due to gen on: "
4099 "\"%s\" -> \"%s\"\n",
4100 fromnd
->nl_nch
.ncp
->nc_name
,
4101 tond
->nl_nch
.ncp
->nc_name
);
4108 * If either fromnd or tond are marked destroyed a ripout occured
4109 * out from under us and we must retry.
4111 if ((fromnd
->nl_nch
.ncp
->nc_flag
& (NCF_DESTROYED
| NCF_UNRESOLVED
)) ||
4112 fromnd
->nl_nch
.ncp
->nc_vp
== NULL
||
4113 (tond
->nl_nch
.ncp
->nc_flag
& NCF_DESTROYED
)) {
4114 kprintf("kern_rename: retry due to ripout on: "
4115 "\"%s\" -> \"%s\"\n",
4116 fromnd
->nl_nch
.ncp
->nc_name
,
4117 tond
->nl_nch
.ncp
->nc_name
);
4124 * Make sure the parent directories linkages are the same.
4125 * XXX shouldn't be needed any more w/ generation check above.
4127 if (fnchd
.ncp
!= fromnd
->nl_nch
.ncp
->nc_parent
||
4128 tnchd
.ncp
!= tond
->nl_nch
.ncp
->nc_parent
) {
4135 * Both the source and target must be within the same filesystem and
4136 * in the same filesystem as their parent directories within the
4137 * namecache topology.
4139 * NOTE: fromnd's nc_mount or nc_vp could be NULL.
4142 if (mp
!= tnchd
.mount
|| mp
!= fromnd
->nl_nch
.mount
||
4143 mp
!= tond
->nl_nch
.mount
) {
4150 * Make sure the mount point is writable
4152 if ((error
= ncp_writechk(&tond
->nl_nch
)) != 0) {
4159 * If the target exists and either the source or target is a directory,
4160 * then both must be directories.
4162 * Due to relocking of the source, fromnd->nl_nch.ncp->nc_vp might h
4165 if (tond
->nl_nch
.ncp
->nc_vp
) {
4166 if (fromnd
->nl_nch
.ncp
->nc_vp
== NULL
) {
4168 } else if (fromnd
->nl_nch
.ncp
->nc_vp
->v_type
== VDIR
) {
4169 if (tond
->nl_nch
.ncp
->nc_vp
->v_type
!= VDIR
)
4171 } else if (tond
->nl_nch
.ncp
->nc_vp
->v_type
== VDIR
) {
4177 * You cannot rename a source into itself or a subdirectory of itself.
4178 * We check this by travsersing the target directory upwards looking
4179 * for a match against the source.
4184 for (ncp
= tnchd
.ncp
; ncp
; ncp
= ncp
->nc_parent
) {
4185 if (fromnd
->nl_nch
.ncp
== ncp
) {
4196 * Even though the namespaces are different, they may still represent
4197 * hardlinks to the same file. The filesystem might have a hard time
4198 * with this so we issue a NREMOVE of the source instead of a NRENAME
4199 * when we detect the situation.
4202 fdvp
= fromnd
->nl_dvp
;
4203 tdvp
= tond
->nl_dvp
;
4204 if (fdvp
== NULL
|| tdvp
== NULL
) {
4206 } else if (fromnd
->nl_nch
.ncp
->nc_vp
== tond
->nl_nch
.ncp
->nc_vp
) {
4207 error
= VOP_NREMOVE(&fromnd
->nl_nch
, fdvp
,
4210 error
= VOP_NRENAME(&fromnd
->nl_nch
, &tond
->nl_nch
,
4211 fdvp
, tdvp
, tond
->nl_cred
);
4218 * rename_args(char *from, char *to)
4220 * Rename files. Source and destination must either both be directories,
4221 * or both not be directories. If target is a directory, it must be empty.
4224 sys_rename(struct rename_args
*uap
)
4226 struct nlookupdata fromnd
, tond
;
4230 error
= nlookup_init(&fromnd
, uap
->from
, UIO_USERSPACE
, 0);
4232 error
= nlookup_init(&tond
, uap
->to
, UIO_USERSPACE
, 0);
4234 error
= kern_rename(&fromnd
, &tond
);
4235 nlookup_done(&tond
);
4237 nlookup_done(&fromnd
);
4238 } while (error
== EAGAIN
);
4243 * renameat_args(int oldfd, char *old, int newfd, char *new)
4245 * Rename files using paths relative to the directories associated with
4246 * oldfd and newfd. Source and destination must either both be directories,
4247 * or both not be directories. If target is a directory, it must be empty.
4250 sys_renameat(struct renameat_args
*uap
)
4252 struct nlookupdata oldnd
, newnd
;
4253 struct file
*oldfp
, *newfp
;
4257 error
= nlookup_init_at(&oldnd
, &oldfp
,
4258 uap
->oldfd
, uap
->old
,
4261 error
= nlookup_init_at(&newnd
, &newfp
,
4262 uap
->newfd
, uap
->new,
4265 error
= kern_rename(&oldnd
, &newnd
);
4266 nlookup_done_at(&newnd
, newfp
);
4268 nlookup_done_at(&oldnd
, oldfp
);
4269 } while (error
== EAGAIN
);
4274 kern_mkdir(struct nlookupdata
*nd
, int mode
)
4276 struct thread
*td
= curthread
;
4277 struct proc
*p
= td
->td_proc
;
4283 nd
->nl_flags
|= NLC_WILLBEDIR
| NLC_CREATE
| NLC_REFDVP
;
4284 if ((error
= nlookup(nd
)) != 0)
4287 if (nd
->nl_nch
.ncp
->nc_vp
)
4289 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
4292 vattr
.va_type
= VDIR
;
4293 vattr
.va_mode
= (mode
& ACCESSPERMS
) &~ p
->p_fd
->fd_cmask
;
4296 error
= VOP_NMKDIR(&nd
->nl_nch
, nd
->nl_dvp
, &vp
, td
->td_ucred
, &vattr
);
4303 * mkdir_args(char *path, int mode)
4305 * Make a directory file.
4308 sys_mkdir(struct mkdir_args
*uap
)
4310 struct nlookupdata nd
;
4313 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
4315 error
= kern_mkdir(&nd
, uap
->mode
);
4321 * mkdirat_args(int fd, char *path, mode_t mode)
4323 * Make a directory file. The path is relative to the directory associated
4327 sys_mkdirat(struct mkdirat_args
*uap
)
4329 struct nlookupdata nd
;
4333 error
= nlookup_init_at(&nd
, &fp
, uap
->fd
, uap
->path
, UIO_USERSPACE
, 0);
4335 error
= kern_mkdir(&nd
, uap
->mode
);
4336 nlookup_done_at(&nd
, fp
);
4341 kern_rmdir(struct nlookupdata
*nd
)
4346 nd
->nl_flags
|= NLC_DELETE
| NLC_REFDVP
;
4347 if ((error
= nlookup(nd
)) != 0)
4351 * Do not allow directories representing mount points to be
4352 * deleted, even if empty. Check write perms on mount point
4353 * in case the vnode is aliased (aka nullfs).
4355 if (nd
->nl_nch
.ncp
->nc_flag
& (NCF_ISMOUNTPT
))
4357 if ((error
= ncp_writechk(&nd
->nl_nch
)) != 0)
4359 error
= VOP_NRMDIR(&nd
->nl_nch
, nd
->nl_dvp
, nd
->nl_cred
);
4364 * rmdir_args(char *path)
4366 * Remove a directory file.
4369 sys_rmdir(struct rmdir_args
*uap
)
4371 struct nlookupdata nd
;
4374 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, 0);
4376 error
= kern_rmdir(&nd
);
4382 kern_getdirentries(int fd
, char *buf
, u_int count
, long *basep
, int *res
,
4383 enum uio_seg direction
)
4385 struct thread
*td
= curthread
;
4393 if ((error
= holdvnode(td
, fd
, &fp
)) != 0)
4395 if ((fp
->f_flag
& FREAD
) == 0) {
4399 vp
= (struct vnode
*)fp
->f_data
;
4400 if (vp
->v_type
!= VDIR
) {
4404 aiov
.iov_base
= buf
;
4405 aiov
.iov_len
= count
;
4406 auio
.uio_iov
= &aiov
;
4407 auio
.uio_iovcnt
= 1;
4408 auio
.uio_rw
= UIO_READ
;
4409 auio
.uio_segflg
= direction
;
4411 auio
.uio_resid
= count
;
4412 loff
= auio
.uio_offset
= fp
->f_offset
;
4413 error
= VOP_READDIR(vp
, &auio
, fp
->f_cred
, &eofflag
, NULL
, NULL
);
4414 fp
->f_offset
= auio
.uio_offset
;
4419 * WARNING! *basep may not be wide enough to accomodate the
4420 * seek offset. XXX should we hack this to return the upper 32 bits
4421 * for offsets greater then 4G?
4424 *basep
= (long)loff
;
4426 *res
= count
- auio
.uio_resid
;
4433 * getdirentries_args(int fd, char *buf, u_int conut, long *basep)
4435 * Read a block of directory entries in a file system independent format.
4438 sys_getdirentries(struct getdirentries_args
*uap
)
4443 error
= kern_getdirentries(uap
->fd
, uap
->buf
, uap
->count
, &base
,
4444 &uap
->sysmsg_result
, UIO_USERSPACE
);
4446 if (error
== 0 && uap
->basep
)
4447 error
= copyout(&base
, uap
->basep
, sizeof(*uap
->basep
));
4452 * getdents_args(int fd, char *buf, size_t count)
4455 sys_getdents(struct getdents_args
*uap
)
4459 error
= kern_getdirentries(uap
->fd
, uap
->buf
, uap
->count
, NULL
,
4460 &uap
->sysmsg_result
, UIO_USERSPACE
);
4466 * Set the mode mask for creation of filesystem nodes.
4468 * umask(int newmask)
4471 sys_umask(struct umask_args
*uap
)
4473 struct thread
*td
= curthread
;
4474 struct proc
*p
= td
->td_proc
;
4475 struct filedesc
*fdp
;
4478 uap
->sysmsg_result
= fdp
->fd_cmask
;
4479 fdp
->fd_cmask
= uap
->newmask
& ALLPERMS
;
4484 * revoke(char *path)
4486 * Void all references to file by ripping underlying filesystem
4490 sys_revoke(struct revoke_args
*uap
)
4492 struct nlookupdata nd
;
4499 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
4501 error
= nlookup(&nd
);
4503 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
4504 cred
= crhold(nd
.nl_cred
);
4508 error
= VOP_GETATTR(vp
, &vattr
);
4509 if (error
== 0 && cred
->cr_uid
!= vattr
.va_uid
)
4510 error
= priv_check_cred(cred
, PRIV_VFS_REVOKE
, 0);
4511 if (error
== 0 && (vp
->v_type
== VCHR
|| vp
->v_type
== VBLK
)) {
4513 error
= vrevoke(vp
, cred
);
4514 } else if (error
== 0) {
4515 error
= vrevoke(vp
, cred
);
4525 * getfh_args(char *fname, fhandle_t *fhp)
4527 * Get (NFS) file handle
4529 * NOTE: We use the fsid of the covering mount, even if it is a nullfs
4530 * mount. This allows nullfs mounts to be explicitly exported.
4532 * WARNING: nullfs mounts of HAMMER PFS ROOTs are safe.
4534 * nullfs mounts of subdirectories are not safe. That is, it will
4535 * work, but you do not really have protection against access to
4536 * the related parent directories.
4539 sys_getfh(struct getfh_args
*uap
)
4541 struct thread
*td
= curthread
;
4542 struct nlookupdata nd
;
4549 * Must be super user
4551 if ((error
= priv_check(td
, PRIV_ROOT
)) != 0)
4555 error
= nlookup_init(&nd
, uap
->fname
, UIO_USERSPACE
, NLC_FOLLOW
);
4557 error
= nlookup(&nd
);
4559 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_EXCLUSIVE
, &vp
);
4560 mp
= nd
.nl_nch
.mount
;
4563 bzero(&fh
, sizeof(fh
));
4564 fh
.fh_fsid
= mp
->mnt_stat
.f_fsid
;
4565 error
= VFS_VPTOFH(vp
, &fh
.fh_fid
);
4568 error
= copyout(&fh
, uap
->fhp
, sizeof(fh
));
4574 * fhopen_args(const struct fhandle *u_fhp, int flags)
4576 * syscall for the rpc.lockd to use to translate a NFS file handle into
4577 * an open descriptor.
4579 * warning: do not remove the priv_check() call or this becomes one giant
4583 sys_fhopen(struct fhopen_args
*uap
)
4585 struct thread
*td
= curthread
;
4586 struct filedesc
*fdp
= td
->td_proc
->p_fd
;
4591 struct vattr
*vap
= &vat
;
4593 int fmode
, mode
, error
= 0, type
;
4599 * Must be super user
4601 error
= priv_check(td
, PRIV_ROOT
);
4605 fmode
= FFLAGS(uap
->flags
);
4608 * Why not allow a non-read/write open for our lockd?
4610 if (((fmode
& (FREAD
| FWRITE
)) == 0) || (fmode
& O_CREAT
))
4612 error
= copyin(uap
->u_fhp
, &fhp
, sizeof(fhp
));
4617 * Find the mount point
4619 mp
= vfs_getvfs(&fhp
.fh_fsid
);
4624 /* now give me my vnode, it gets returned to me locked */
4625 error
= VFS_FHTOVP(mp
, NULL
, &fhp
.fh_fid
, &vp
);
4629 * from now on we have to make sure not
4630 * to forget about the vnode
4631 * any error that causes an abort must vput(vp)
4632 * just set error = err and 'goto bad;'.
4638 if (vp
->v_type
== VLNK
) {
4642 if (vp
->v_type
== VSOCK
) {
4647 if (fmode
& (FWRITE
| O_TRUNC
)) {
4648 if (vp
->v_type
== VDIR
) {
4652 error
= vn_writechk(vp
, NULL
);
4660 error
= VOP_ACCESS(vp
, mode
, td
->td_ucred
);
4664 if (fmode
& O_TRUNC
) {
4665 vn_unlock(vp
); /* XXX */
4666 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
); /* XXX */
4669 error
= VOP_SETATTR(vp
, vap
, td
->td_ucred
);
4675 * VOP_OPEN needs the file pointer so it can potentially override
4678 * WARNING! no f_nchandle will be associated when fhopen()ing a
4681 if ((error
= falloc(td
->td_lwp
, &nfp
, &indx
)) != 0)
4685 error
= VOP_OPEN(vp
, fmode
, td
->td_ucred
, fp
);
4688 * setting f_ops this way prevents VOP_CLOSE from being
4689 * called or fdrop() releasing the vp from v_data. Since
4690 * the VOP_OPEN failed we don't want to VOP_CLOSE.
4692 fp
->f_ops
= &badfileops
;
4698 * The fp is given its own reference, we still have our ref and lock.
4700 * Assert that all regular files must be created with a VM object.
4702 if (vp
->v_type
== VREG
&& vp
->v_object
== NULL
) {
4703 kprintf("fhopen: regular file did not "
4704 "have VM object: %p\n",
4710 * The open was successful. Handle any locking requirements.
4712 if (fmode
& (O_EXLOCK
| O_SHLOCK
)) {
4713 lf
.l_whence
= SEEK_SET
;
4716 if (fmode
& O_EXLOCK
)
4717 lf
.l_type
= F_WRLCK
;
4719 lf
.l_type
= F_RDLCK
;
4720 if (fmode
& FNONBLOCK
)
4725 if ((error
= VOP_ADVLOCK(vp
, (caddr_t
)fp
, F_SETLK
,
4728 * release our private reference.
4730 fsetfd(fdp
, NULL
, indx
);
4735 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
4736 atomic_set_int(&fp
->f_flag
, FHASLOCK
); /* race ok */
4740 * Clean up. Associate the file pointer with the previously
4741 * reserved descriptor and return it.
4744 if (uap
->flags
& O_CLOEXEC
)
4745 fdp
->fd_files
[indx
].fileflags
|= UF_EXCLOSE
;
4746 fsetfd(fdp
, fp
, indx
);
4748 uap
->sysmsg_result
= indx
;
4754 fsetfd(fdp
, NULL
, indx
);
4765 * fhstat_args(struct fhandle *u_fhp, struct stat *sb)
4768 sys_fhstat(struct fhstat_args
*uap
)
4770 struct thread
*td
= curthread
;
4778 * Must be super user
4780 error
= priv_check(td
, PRIV_ROOT
);
4784 error
= copyin(uap
->u_fhp
, &fh
, sizeof(fhandle_t
));
4788 if ((mp
= vfs_getvfs(&fh
.fh_fsid
)) == NULL
)
4791 if ((error
= VFS_FHTOVP(mp
, NULL
, &fh
.fh_fid
, &vp
)) == 0) {
4792 error
= vn_stat(vp
, &sb
, td
->td_ucred
);
4797 error
= copyout(&sb
, uap
->sb
, sizeof(sb
));
4805 * fhstatfs_args(struct fhandle *u_fhp, struct statfs *buf)
4808 sys_fhstatfs(struct fhstatfs_args
*uap
)
4810 struct thread
*td
= curthread
;
4811 struct proc
*p
= td
->td_proc
;
4816 char *fullpath
, *freepath
;
4821 * Must be super user
4823 if ((error
= priv_check(td
, PRIV_ROOT
)))
4826 if ((error
= copyin(uap
->u_fhp
, &fh
, sizeof(fhandle_t
))) != 0)
4829 if ((mp
= vfs_getvfs(&fh
.fh_fsid
)) == NULL
) {
4833 if (p
!= NULL
&& !chroot_visible_mnt(mp
, p
)) {
4838 if ((error
= VFS_FHTOVP(mp
, NULL
, &fh
.fh_fid
, &vp
)) != 0)
4843 if ((error
= VFS_STATFS(mp
, sp
, td
->td_ucred
)) != 0)
4846 error
= mount_path(p
, mp
, &fullpath
, &freepath
);
4849 bzero(sp
->f_mntonname
, sizeof(sp
->f_mntonname
));
4850 strlcpy(sp
->f_mntonname
, fullpath
, sizeof(sp
->f_mntonname
));
4851 kfree(freepath
, M_TEMP
);
4853 sp
->f_flags
= mp
->mnt_flag
& MNT_VISFLAGMASK
;
4854 if (priv_check(td
, PRIV_ROOT
)) {
4855 bcopy(sp
, &sb
, sizeof(sb
));
4856 sb
.f_fsid
.val
[0] = sb
.f_fsid
.val
[1] = 0;
4859 error
= copyout(sp
, uap
->buf
, sizeof(*sp
));
4868 * fhstatvfs_args(struct fhandle *u_fhp, struct statvfs *buf)
4871 sys_fhstatvfs(struct fhstatvfs_args
*uap
)
4873 struct thread
*td
= curthread
;
4874 struct proc
*p
= td
->td_proc
;
4882 * Must be super user
4884 if ((error
= priv_check(td
, PRIV_ROOT
)))
4887 if ((error
= copyin(uap
->u_fhp
, &fh
, sizeof(fhandle_t
))) != 0)
4890 if ((mp
= vfs_getvfs(&fh
.fh_fsid
)) == NULL
) {
4894 if (p
!= NULL
&& !chroot_visible_mnt(mp
, p
)) {
4899 if ((error
= VFS_FHTOVP(mp
, NULL
, &fh
.fh_fid
, &vp
)))
4902 sp
= &mp
->mnt_vstat
;
4904 if ((error
= VFS_STATVFS(mp
, sp
, td
->td_ucred
)) != 0)
4908 if (mp
->mnt_flag
& MNT_RDONLY
)
4909 sp
->f_flag
|= ST_RDONLY
;
4910 if (mp
->mnt_flag
& MNT_NOSUID
)
4911 sp
->f_flag
|= ST_NOSUID
;
4912 error
= copyout(sp
, uap
->buf
, sizeof(*sp
));
4921 * Syscall to push extended attribute configuration information into the
4922 * VFS. Accepts a path, which it converts to a mountpoint, as well as
4923 * a command (int cmd), and attribute name and misc data. For now, the
4924 * attribute name is left in userspace for consumption by the VFS_op.
4925 * It will probably be changed to be copied into sysspace by the
4926 * syscall in the future, once issues with various consumers of the
4927 * attribute code have raised their hands.
4929 * Currently this is used only by UFS Extended Attributes.
4932 sys_extattrctl(struct extattrctl_args
*uap
)
4934 struct nlookupdata nd
;
4936 char attrname
[EXTATTR_MAXNAMELEN
];
4944 if (error
== 0 && uap
->filename
) {
4945 error
= nlookup_init(&nd
, uap
->filename
, UIO_USERSPACE
,
4948 error
= nlookup(&nd
);
4950 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
4954 if (error
== 0 && uap
->attrname
) {
4955 error
= copyinstr(uap
->attrname
, attrname
, EXTATTR_MAXNAMELEN
,
4960 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
4962 error
= nlookup(&nd
);
4964 error
= ncp_writechk(&nd
.nl_nch
);
4966 error
= VFS_EXTATTRCTL(nd
.nl_nch
.mount
, uap
->cmd
, vp
,
4968 uap
->attrname
, nd
.nl_cred
);
4977 * Syscall to get a named extended attribute on a file or directory.
4980 sys_extattr_set_file(struct extattr_set_file_args
*uap
)
4982 char attrname
[EXTATTR_MAXNAMELEN
];
4983 struct nlookupdata nd
;
4989 error
= copyin(uap
->attrname
, attrname
, EXTATTR_MAXNAMELEN
);
4995 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
4997 error
= nlookup(&nd
);
4999 error
= ncp_writechk(&nd
.nl_nch
);
5001 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_EXCLUSIVE
, &vp
);
5007 bzero(&auio
, sizeof(auio
));
5008 aiov
.iov_base
= uap
->data
;
5009 aiov
.iov_len
= uap
->nbytes
;
5010 auio
.uio_iov
= &aiov
;
5011 auio
.uio_iovcnt
= 1;
5012 auio
.uio_offset
= 0;
5013 auio
.uio_resid
= uap
->nbytes
;
5014 auio
.uio_rw
= UIO_WRITE
;
5015 auio
.uio_td
= curthread
;
5017 error
= VOP_SETEXTATTR(vp
, uap
->attrnamespace
, attrname
,
5026 * Syscall to get a named extended attribute on a file or directory.
5029 sys_extattr_get_file(struct extattr_get_file_args
*uap
)
5031 char attrname
[EXTATTR_MAXNAMELEN
];
5032 struct nlookupdata nd
;
5038 error
= copyin(uap
->attrname
, attrname
, EXTATTR_MAXNAMELEN
);
5044 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
5046 error
= nlookup(&nd
);
5048 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_SHARED
, &vp
);
5054 bzero(&auio
, sizeof(auio
));
5055 aiov
.iov_base
= uap
->data
;
5056 aiov
.iov_len
= uap
->nbytes
;
5057 auio
.uio_iov
= &aiov
;
5058 auio
.uio_iovcnt
= 1;
5059 auio
.uio_offset
= 0;
5060 auio
.uio_resid
= uap
->nbytes
;
5061 auio
.uio_rw
= UIO_READ
;
5062 auio
.uio_td
= curthread
;
5064 error
= VOP_GETEXTATTR(vp
, uap
->attrnamespace
, attrname
,
5066 uap
->sysmsg_result
= uap
->nbytes
- auio
.uio_resid
;
5074 * Syscall to delete a named extended attribute from a file or directory.
5075 * Accepts attribute name. The real work happens in VOP_SETEXTATTR().
5078 sys_extattr_delete_file(struct extattr_delete_file_args
*uap
)
5080 char attrname
[EXTATTR_MAXNAMELEN
];
5081 struct nlookupdata nd
;
5085 error
= copyin(uap
->attrname
, attrname
, EXTATTR_MAXNAMELEN
);
5089 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
5091 error
= nlookup(&nd
);
5093 error
= ncp_writechk(&nd
.nl_nch
);
5095 error
= cache_vget(&nd
.nl_nch
, nd
.nl_cred
, LK_EXCLUSIVE
, &vp
);
5097 error
= VOP_SETEXTATTR(vp
, uap
->attrnamespace
,
5098 attrname
, NULL
, nd
.nl_cred
);
5107 * Determine if the mount is visible to the process.
5110 chroot_visible_mnt(struct mount
*mp
, struct proc
*p
)
5112 struct nchandle nch
;
5115 * Traverse from the mount point upwards. If we hit the process
5116 * root then the mount point is visible to the process.
5118 nch
= mp
->mnt_ncmountpt
;
5120 if (nch
.mount
== p
->p_fd
->fd_nrdir
.mount
&&
5121 nch
.ncp
== p
->p_fd
->fd_nrdir
.ncp
) {
5124 if (nch
.ncp
== nch
.mount
->mnt_ncmountpt
.ncp
) {
5125 nch
= nch
.mount
->mnt_ncmounton
;
5127 nch
.ncp
= nch
.ncp
->nc_parent
;
5132 * If the mount point is not visible to the process, but the
5133 * process root is in a subdirectory of the mount, return
5136 if (p
->p_fd
->fd_nrdir
.mount
== mp
)