author | amw |
Thu, 25 Oct 2007 16:34:29 -0700 | |
changeset 5331 | 3047ad28a67b |
parent 3898 | c788126f2a20 |
child 5410 | 666e3897b15e |
permissions | -rw-r--r-- |
0 | 1 |
/* |
2 |
* CDDL HEADER START |
|
3 |
* |
|
4 |
* The contents of this file are subject to the terms of the |
|
2621 | 5 |
* Common Development and Distribution License (the "License"). |
6 |
* You may not use this file except in compliance with the License. |
|
0 | 7 |
* |
8 |
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE |
|
9 |
* or http://www.opensolaris.org/os/licensing. |
|
10 |
* See the License for the specific language governing permissions |
|
11 |
* and limitations under the License. |
|
12 |
* |
|
13 |
* When distributing Covered Code, include this CDDL HEADER in each |
|
14 |
* file and include the License file at usr/src/OPENSOLARIS.LICENSE. |
|
15 |
* If applicable, add the following below this CDDL HEADER, with the |
|
16 |
* fields enclosed by brackets "[]" replaced with your own identifying |
|
17 |
* information: Portions Copyright [yyyy] [name of copyright owner] |
|
18 |
* |
|
19 |
* CDDL HEADER END |
|
20 |
*/ |
|
21 |
/* |
|
3898
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rsb
parents:
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diff
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|
22 |
* Copyright 2007 Sun Microsystems, Inc. All rights reserved. |
0 | 23 |
* Use is subject to license terms. |
24 |
*/ |
|
25 |
||
26 |
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ |
|
27 |
/* All Rights Reserved */ |
|
28 |
||
29 |
||
30 |
#pragma ident "%Z%%M% %I% %E% SMI" /* from S5R4 1.28 */ |
|
31 |
||
32 |
/* |
|
33 |
* This file supports the vfs operations for the NAMEFS file system. |
|
34 |
*/ |
|
35 |
||
36 |
#include <sys/types.h> |
|
37 |
#include <sys/param.h> |
|
38 |
#include <sys/systm.h> |
|
39 |
#include <sys/debug.h> |
|
40 |
#include <sys/errno.h> |
|
41 |
#include <sys/kmem.h> |
|
42 |
#include <sys/inline.h> |
|
43 |
#include <sys/file.h> |
|
44 |
#include <sys/proc.h> |
|
45 |
#include <sys/stat.h> |
|
46 |
#include <sys/statvfs.h> |
|
47 |
#include <sys/mount.h> |
|
48 |
#include <sys/sysmacros.h> |
|
49 |
#include <sys/var.h> |
|
50 |
#include <sys/vfs.h> |
|
3898
c788126f2a20
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rsb
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diff
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|
51 |
#include <sys/vfs_opreg.h> |
0 | 52 |
#include <sys/vnode.h> |
53 |
#include <sys/mode.h> |
|
54 |
#include <sys/pcb.h> |
|
55 |
#include <sys/signal.h> |
|
56 |
#include <sys/user.h> |
|
57 |
#include <sys/uio.h> |
|
58 |
#include <sys/cred.h> |
|
59 |
#include <sys/fs/namenode.h> |
|
60 |
#include <sys/stream.h> |
|
61 |
#include <sys/strsubr.h> |
|
62 |
#include <sys/cmn_err.h> |
|
63 |
#include <sys/modctl.h> |
|
64 |
#include <fs/fs_subr.h> |
|
65 |
#include <sys/policy.h> |
|
66 |
#include <sys/vmem.h> |
|
2621 | 67 |
#include <sys/fs/sdev_impl.h> |
0 | 68 |
|
69 |
#define NM_INOQUANT (64 * 1024) |
|
70 |
||
71 |
/* |
|
72 |
* Define global data structures. |
|
73 |
*/ |
|
74 |
dev_t namedev; |
|
75 |
int namefstype; |
|
76 |
struct namenode *nm_filevp_hash[NM_FILEVP_HASH_SIZE]; |
|
77 |
struct vfs namevfs; |
|
78 |
kmutex_t ntable_lock; |
|
79 |
||
80 |
static vmem_t *nm_inoarena; /* vmem arena to allocate inode no's from */ |
|
81 |
static kmutex_t nm_inolock; |
|
82 |
||
83 |
/* |
|
84 |
* Functions to allocate node id's starting from 1. Based on vmem routines. |
|
85 |
* The vmem arena is extended in NM_INOQUANT chunks. |
|
86 |
*/ |
|
87 |
uint64_t |
|
88 |
namenodeno_alloc(void) |
|
89 |
{ |
|
90 |
uint64_t nno; |
|
91 |
||
92 |
mutex_enter(&nm_inolock); |
|
93 |
nno = (uint64_t)(uintptr_t) |
|
94 |
vmem_alloc(nm_inoarena, 1, VM_NOSLEEP + VM_FIRSTFIT); |
|
95 |
if (nno == 0) { |
|
96 |
(void) vmem_add(nm_inoarena, (void *)(vmem_size(nm_inoarena, |
|
97 |
VMEM_ALLOC | VMEM_FREE) + 1), NM_INOQUANT, VM_SLEEP); |
|
98 |
nno = (uint64_t)(uintptr_t) |
|
99 |
vmem_alloc(nm_inoarena, 1, VM_SLEEP + VM_FIRSTFIT); |
|
100 |
ASSERT(nno != 0); |
|
101 |
} |
|
102 |
mutex_exit(&nm_inolock); |
|
103 |
ASSERT32(nno <= ULONG_MAX); |
|
104 |
return (nno); |
|
105 |
} |
|
106 |
||
107 |
static void |
|
108 |
namenodeno_init(void) |
|
109 |
{ |
|
110 |
nm_inoarena = vmem_create("namefs_inodes", (void *)1, NM_INOQUANT, 1, |
|
111 |
NULL, NULL, NULL, 1, VM_SLEEP); |
|
112 |
mutex_init(&nm_inolock, NULL, MUTEX_DEFAULT, NULL); |
|
113 |
} |
|
114 |
||
115 |
void |
|
116 |
namenodeno_free(uint64_t nn) |
|
117 |
{ |
|
118 |
void *vaddr = (void *)(uintptr_t)nn; |
|
119 |
||
120 |
ASSERT32((uint64_t)(uintptr_t)vaddr == nn); |
|
121 |
||
122 |
mutex_enter(&nm_inolock); |
|
123 |
vmem_free(nm_inoarena, vaddr, 1); |
|
124 |
mutex_exit(&nm_inolock); |
|
125 |
} |
|
126 |
||
127 |
/* |
|
128 |
* Insert a namenode into the nm_filevp_hash table. |
|
129 |
* |
|
130 |
* Each link has a unique namenode with a unique nm_mountvp field. |
|
131 |
* The nm_filevp field of the namenode need not be unique, since a |
|
132 |
* file descriptor may be mounted to multiple nodes at the same time. |
|
133 |
* We hash on nm_filevp since that's what discriminates the searches |
|
134 |
* in namefind() and nm_unmountall(). |
|
135 |
*/ |
|
136 |
void |
|
137 |
nameinsert(struct namenode *nodep) |
|
138 |
{ |
|
139 |
struct namenode **bucket; |
|
140 |
||
141 |
ASSERT(MUTEX_HELD(&ntable_lock)); |
|
142 |
||
143 |
bucket = NM_FILEVP_HASH(nodep->nm_filevp); |
|
144 |
nodep->nm_nextp = *bucket; |
|
145 |
*bucket = nodep; |
|
146 |
} |
|
147 |
||
148 |
/* |
|
149 |
* Remove a namenode from the hash table, if present. |
|
150 |
*/ |
|
151 |
void |
|
152 |
nameremove(struct namenode *nodep) |
|
153 |
{ |
|
154 |
struct namenode *np, **npp; |
|
155 |
||
156 |
ASSERT(MUTEX_HELD(&ntable_lock)); |
|
157 |
||
158 |
for (npp = NM_FILEVP_HASH(nodep->nm_filevp); (np = *npp) != NULL; |
|
159 |
npp = &np->nm_nextp) { |
|
160 |
if (np == nodep) { |
|
161 |
*npp = np->nm_nextp; |
|
162 |
return; |
|
163 |
} |
|
164 |
} |
|
165 |
} |
|
166 |
||
167 |
/* |
|
168 |
* Search for a namenode that has a nm_filevp == vp and nm_mountpt == mnt. |
|
169 |
* If mnt is NULL, return the first link with nm_filevp of vp. |
|
170 |
* Returns namenode pointer on success, NULL on failure. |
|
171 |
*/ |
|
172 |
struct namenode * |
|
173 |
namefind(vnode_t *vp, vnode_t *mnt) |
|
174 |
{ |
|
175 |
struct namenode *np; |
|
176 |
||
177 |
ASSERT(MUTEX_HELD(&ntable_lock)); |
|
178 |
for (np = *NM_FILEVP_HASH(vp); np != NULL; np = np->nm_nextp) |
|
179 |
if (np->nm_filevp == vp && |
|
180 |
(mnt == NULL || np->nm_mountpt == mnt)) |
|
181 |
break; |
|
182 |
return (np); |
|
183 |
} |
|
184 |
||
185 |
/* |
|
186 |
* Force the unmouting of a file descriptor from ALL of the nodes |
|
187 |
* that it was mounted to. |
|
188 |
* At the present time, the only usage for this routine is in the |
|
189 |
* event one end of a pipe was mounted. At the time the unmounted |
|
190 |
* end gets closed down, the mounted end is forced to be unmounted. |
|
191 |
* |
|
192 |
* This routine searches the namenode hash list for all namenodes |
|
193 |
* that have a nm_filevp field equal to vp. Each time one is found, |
|
194 |
* the dounmount() routine is called. This causes the nm_unmount() |
|
195 |
* routine to be called and thus, the file descriptor is unmounted |
|
196 |
* from the node. |
|
197 |
* |
|
198 |
* At the start of this routine, the reference count for vp is |
|
199 |
* incremented to protect the vnode from being released in the |
|
200 |
* event the mount was the only thing keeping the vnode active. |
|
201 |
* If that is the case, the VOP_CLOSE operation is applied to |
|
202 |
* the vnode, prior to it being released. |
|
203 |
*/ |
|
204 |
static int |
|
205 |
nm_umountall(vnode_t *vp, cred_t *crp) |
|
206 |
{ |
|
207 |
vfs_t *vfsp; |
|
208 |
struct namenode *nodep; |
|
209 |
int error = 0; |
|
210 |
int realerr = 0; |
|
211 |
||
212 |
/* |
|
213 |
* For each namenode that is associated with the file: |
|
214 |
* If the v_vfsp field is not namevfs, dounmount it. Otherwise, |
|
215 |
* it was created in nm_open() and will be released in time. |
|
216 |
* The following loop replicates some code from nm_find. That |
|
217 |
* routine can't be used as is since the list isn't strictly |
|
218 |
* consumed as it is traversed. |
|
219 |
*/ |
|
220 |
mutex_enter(&ntable_lock); |
|
221 |
nodep = *NM_FILEVP_HASH(vp); |
|
222 |
while (nodep) { |
|
223 |
if (nodep->nm_filevp == vp && |
|
224 |
(vfsp = NMTOV(nodep)->v_vfsp) != NULL && vfsp != &namevfs) { |
|
225 |
||
226 |
/* |
|
569
3b366c606430
PSARC 2005/287 obsolete and remove vn_vfslock interface
batschul
parents:
0
diff
changeset
|
227 |
* If the vn_vfswlock fails, skip the vfs since |
0 | 228 |
* somebody else may be unmounting it. |
229 |
*/ |
|
569
3b366c606430
PSARC 2005/287 obsolete and remove vn_vfslock interface
batschul
parents:
0
diff
changeset
|
230 |
if (vn_vfswlock(vfsp->vfs_vnodecovered)) { |
0 | 231 |
realerr = EBUSY; |
232 |
nodep = nodep->nm_nextp; |
|
233 |
continue; |
|
234 |
} |
|
235 |
||
236 |
/* |
|
237 |
* Can't hold ntable_lock across call to do_unmount |
|
238 |
* because nm_unmount tries to acquire it. This means |
|
239 |
* there is a window where another mount of vp can |
|
240 |
* happen so it is possible that after nm_unmountall |
|
241 |
* there are still some mounts. This situation existed |
|
242 |
* without MT locking because dounmount can sleep |
|
243 |
* so another mount could happen during that time. |
|
244 |
* This situation is unlikely and doesn't really cause |
|
245 |
* any problems. |
|
246 |
*/ |
|
247 |
mutex_exit(&ntable_lock); |
|
248 |
if ((error = dounmount(vfsp, 0, crp)) != 0) |
|
249 |
realerr = error; |
|
250 |
mutex_enter(&ntable_lock); |
|
251 |
/* |
|
252 |
* Since we dropped the ntable_lock, we |
|
253 |
* have to start over from the beginning. |
|
254 |
* If for some reasons dounmount() fails, |
|
255 |
* start from beginning means that we will keep on |
|
256 |
* trying unless another thread unmounts it for us. |
|
257 |
*/ |
|
258 |
nodep = *NM_FILEVP_HASH(vp); |
|
259 |
} else |
|
260 |
nodep = nodep->nm_nextp; |
|
261 |
} |
|
262 |
mutex_exit(&ntable_lock); |
|
263 |
return (realerr); |
|
264 |
} |
|
265 |
||
266 |
/* |
|
267 |
* Force the unmouting of a file descriptor from ALL of the nodes |
|
268 |
* that it was mounted to. XXX: fifo_close() calls this routine. |
|
269 |
* |
|
270 |
* nm_umountall() may return EBUSY. |
|
271 |
* nm_unmountall() will keep on trying until it succeeds. |
|
272 |
*/ |
|
273 |
int |
|
274 |
nm_unmountall(vnode_t *vp, cred_t *crp) |
|
275 |
{ |
|
276 |
int error; |
|
277 |
||
278 |
/* |
|
279 |
* Nm_umuontall() returns only if it succeeds or |
|
280 |
* return with error EBUSY. If EBUSY, that means |
|
281 |
* it cannot acquire the lock on the covered vnode, |
|
282 |
* and we will keep on trying. |
|
283 |
*/ |
|
284 |
for (;;) { |
|
285 |
error = nm_umountall(vp, crp); |
|
286 |
if (error != EBUSY) |
|
287 |
break; |
|
288 |
delay(1); /* yield cpu briefly, then try again */ |
|
289 |
} |
|
290 |
return (error); |
|
291 |
} |
|
292 |
||
293 |
/* |
|
294 |
* Mount a file descriptor onto the node in the file system. |
|
295 |
* Create a new vnode, update the attributes with info from the |
|
296 |
* file descriptor and the mount point. The mask, mode, uid, gid, |
|
297 |
* atime, mtime and ctime are taken from the mountpt. Link count is |
|
298 |
* set to one, the file system id is namedev and nodeid is unique |
|
299 |
* for each mounted object. Other attributes are taken from mount point. |
|
300 |
* Make sure user is owner (or root) with write permissions on mount point. |
|
301 |
* Hash the new vnode and return 0. |
|
302 |
* Upon entry to this routine, the file descriptor is in the |
|
303 |
* fd field of a struct namefd. Copy that structure from user |
|
304 |
* space and retrieve the file descriptor. |
|
305 |
*/ |
|
306 |
static int |
|
307 |
nm_mount(vfs_t *vfsp, vnode_t *mvp, struct mounta *uap, cred_t *crp) |
|
308 |
{ |
|
309 |
struct namefd namefdp; |
|
310 |
struct vnode *filevp; /* file descriptor vnode */ |
|
311 |
struct file *fp; |
|
312 |
struct vnode *newvp; /* vnode representing this mount */ |
|
2678
57f378fe1506
6467069 devfs doesn't clean up pts (and possible other devices)
vikram
parents:
2621
diff
changeset
|
313 |
struct vnode *rvp; /* realvp (if any) for the mountpt */ |
0 | 314 |
struct namenode *nodep; /* namenode for this mount */ |
315 |
struct vattr filevattr; /* attributes of file dec. */ |
|
316 |
struct vattr *vattrp; /* attributes of this mount */ |
|
317 |
char *resource_name; |
|
318 |
char *resource_nodetype; |
|
319 |
statvfs64_t *svfsp; |
|
320 |
int error = 0; |
|
321 |
||
322 |
/* |
|
323 |
* Get the file descriptor from user space. |
|
324 |
* Make sure the file descriptor is valid and has an |
|
325 |
* associated file pointer. |
|
326 |
* If so, extract the vnode from the file pointer. |
|
327 |
*/ |
|
328 |
if (uap->datalen != sizeof (struct namefd)) |
|
329 |
return (EINVAL); |
|
330 |
||
331 |
if (copyin(uap->dataptr, &namefdp, uap->datalen)) |
|
332 |
return (EFAULT); |
|
333 |
||
334 |
if ((fp = getf(namefdp.fd)) == NULL) |
|
335 |
return (EBADF); |
|
336 |
||
337 |
/* |
|
338 |
* If the mount point already has something mounted |
|
339 |
* on it, disallow this mount. (This restriction may |
|
340 |
* be removed in a later release). |
|
341 |
* Or unmount has completed but the namefs ROOT vnode |
|
342 |
* count has not decremented to zero, disallow this mount. |
|
343 |
*/ |
|
344 |
mutex_enter(&mvp->v_lock); |
|
345 |
if ((mvp->v_flag & VROOT) || (mvp->v_vfsp == &namevfs)) { |
|
346 |
mutex_exit(&mvp->v_lock); |
|
347 |
releasef(namefdp.fd); |
|
348 |
return (EBUSY); |
|
349 |
} |
|
350 |
mutex_exit(&mvp->v_lock); |
|
351 |
||
2621 | 352 |
/* |
353 |
* Cannot allow users to fattach() in /dev/pts. |
|
354 |
* First, there is no need for doing so and secondly |
|
355 |
* we cannot allow arbitrary users to park on a |
|
356 |
* /dev/pts node. |
|
357 |
*/ |
|
2678
57f378fe1506
6467069 devfs doesn't clean up pts (and possible other devices)
vikram
parents:
2621
diff
changeset
|
358 |
rvp = NULLVP; |
57f378fe1506
6467069 devfs doesn't clean up pts (and possible other devices)
vikram
parents:
2621
diff
changeset
|
359 |
if (vn_matchops(mvp, spec_getvnodeops()) && |
5331 | 360 |
VOP_REALVP(mvp, &rvp, NULL) == 0 && rvp && |
2678
57f378fe1506
6467069 devfs doesn't clean up pts (and possible other devices)
vikram
parents:
2621
diff
changeset
|
361 |
vn_matchops(rvp, devpts_getvnodeops())) { |
2621 | 362 |
releasef(namefdp.fd); |
363 |
return (ENOTSUP); |
|
364 |
} |
|
365 |
||
0 | 366 |
filevp = fp->f_vnode; |
367 |
if (filevp->v_type == VDIR || filevp->v_type == VPORT) { |
|
368 |
releasef(namefdp.fd); |
|
369 |
return (EINVAL); |
|
370 |
} |
|
371 |
||
372 |
/* |
|
373 |
* If the fd being mounted refers to neither a door nor a stream, |
|
374 |
* make sure the caller is privileged. |
|
375 |
*/ |
|
376 |
if (filevp->v_type != VDOOR && filevp->v_stream == NULL) { |
|
377 |
if (secpolicy_fs_mount(crp, filevp, vfsp) != 0) { |
|
378 |
/* fd is neither a stream nor a door */ |
|
379 |
releasef(namefdp.fd); |
|
380 |
return (EINVAL); |
|
381 |
} |
|
382 |
} |
|
383 |
||
384 |
/* |
|
385 |
* Make sure the file descriptor is not the root of some |
|
386 |
* file system. |
|
387 |
* If it's not, create a reference and allocate a namenode |
|
388 |
* to represent this mount request. |
|
389 |
*/ |
|
390 |
if (filevp->v_flag & VROOT) { |
|
391 |
releasef(namefdp.fd); |
|
392 |
return (EBUSY); |
|
393 |
} |
|
394 |
||
395 |
nodep = kmem_zalloc(sizeof (struct namenode), KM_SLEEP); |
|
396 |
||
397 |
mutex_init(&nodep->nm_lock, NULL, MUTEX_DEFAULT, NULL); |
|
398 |
vattrp = &nodep->nm_vattr; |
|
399 |
vattrp->va_mask = AT_ALL; |
|
5331 | 400 |
if (error = VOP_GETATTR(mvp, vattrp, 0, crp, NULL)) |
0 | 401 |
goto out; |
402 |
||
403 |
filevattr.va_mask = AT_ALL; |
|
5331 | 404 |
if (error = VOP_GETATTR(filevp, &filevattr, 0, crp, NULL)) |
0 | 405 |
goto out; |
406 |
/* |
|
407 |
* Make sure the user is the owner of the mount point |
|
408 |
* or has sufficient privileges. |
|
409 |
*/ |
|
410 |
if (error = secpolicy_vnode_owner(crp, vattrp->va_uid)) |
|
411 |
goto out; |
|
412 |
||
413 |
/* |
|
414 |
* Make sure the user has write permissions on the |
|
415 |
* mount point (or has sufficient privileges). |
|
416 |
*/ |
|
417 |
if (!(vattrp->va_mode & VWRITE) && |
|
418 |
secpolicy_vnode_access(crp, mvp, vattrp->va_uid, VWRITE) != 0) { |
|
419 |
error = EACCES; |
|
420 |
goto out; |
|
421 |
} |
|
422 |
||
423 |
/* |
|
424 |
* If the file descriptor has file/record locking, don't |
|
425 |
* allow the mount to succeed. |
|
426 |
*/ |
|
427 |
if (vn_has_flocks(filevp)) { |
|
428 |
error = EACCES; |
|
429 |
goto out; |
|
430 |
} |
|
431 |
||
432 |
/* |
|
433 |
* Initialize the namenode. |
|
434 |
*/ |
|
435 |
if (filevp->v_stream) { |
|
436 |
struct stdata *stp = filevp->v_stream; |
|
437 |
mutex_enter(&stp->sd_lock); |
|
438 |
stp->sd_flag |= STRMOUNT; |
|
439 |
mutex_exit(&stp->sd_lock); |
|
440 |
} |
|
441 |
nodep->nm_filevp = filevp; |
|
442 |
mutex_enter(&fp->f_tlock); |
|
443 |
fp->f_count++; |
|
444 |
mutex_exit(&fp->f_tlock); |
|
445 |
||
446 |
releasef(namefdp.fd); |
|
447 |
nodep->nm_filep = fp; |
|
448 |
nodep->nm_mountpt = mvp; |
|
449 |
||
450 |
/* |
|
451 |
* The attributes for the mounted file descriptor were initialized |
|
452 |
* above by applying VOP_GETATTR to the mount point. Some of |
|
453 |
* the fields of the attributes structure will be overwritten |
|
454 |
* by the attributes from the file descriptor. |
|
455 |
*/ |
|
456 |
vattrp->va_type = filevattr.va_type; |
|
457 |
vattrp->va_fsid = namedev; |
|
458 |
vattrp->va_nodeid = namenodeno_alloc(); |
|
459 |
vattrp->va_nlink = 1; |
|
460 |
vattrp->va_size = filevattr.va_size; |
|
461 |
vattrp->va_rdev = filevattr.va_rdev; |
|
462 |
vattrp->va_blksize = filevattr.va_blksize; |
|
463 |
vattrp->va_nblocks = filevattr.va_nblocks; |
|
464 |
vattrp->va_seq = 0; |
|
465 |
||
466 |
/* |
|
467 |
* Initialize new vnode structure for the mounted file descriptor. |
|
468 |
*/ |
|
469 |
nodep->nm_vnode = vn_alloc(KM_SLEEP); |
|
470 |
newvp = NMTOV(nodep); |
|
471 |
||
472 |
newvp->v_flag = filevp->v_flag | VROOT | VNOMAP | VNOSWAP; |
|
473 |
vn_setops(newvp, nm_vnodeops); |
|
474 |
newvp->v_vfsp = vfsp; |
|
475 |
newvp->v_stream = filevp->v_stream; |
|
476 |
newvp->v_type = filevp->v_type; |
|
477 |
newvp->v_rdev = filevp->v_rdev; |
|
478 |
newvp->v_data = (caddr_t)nodep; |
|
479 |
vn_exists(newvp); |
|
480 |
||
481 |
/* |
|
482 |
* Initialize the vfs structure. |
|
483 |
*/ |
|
484 |
vfsp->vfs_vnodecovered = NULL; |
|
485 |
vfsp->vfs_flag |= VFS_UNLINKABLE; |
|
486 |
vfsp->vfs_bsize = 1024; |
|
487 |
vfsp->vfs_fstype = namefstype; |
|
488 |
vfs_make_fsid(&vfsp->vfs_fsid, namedev, namefstype); |
|
489 |
vfsp->vfs_data = (caddr_t)nodep; |
|
490 |
vfsp->vfs_dev = namedev; |
|
491 |
vfsp->vfs_bcount = 0; |
|
492 |
||
493 |
/* |
|
494 |
* Set the name we mounted from. |
|
495 |
*/ |
|
496 |
switch (filevp->v_type) { |
|
497 |
case VPROC: /* VOP_GETATTR() translates this to VREG */ |
|
498 |
case VREG: resource_nodetype = "file"; break; |
|
499 |
case VDIR: resource_nodetype = "directory"; break; |
|
500 |
case VBLK: resource_nodetype = "device"; break; |
|
501 |
case VCHR: resource_nodetype = "device"; break; |
|
502 |
case VLNK: resource_nodetype = "link"; break; |
|
503 |
case VFIFO: resource_nodetype = "fifo"; break; |
|
504 |
case VDOOR: resource_nodetype = "door"; break; |
|
505 |
case VSOCK: resource_nodetype = "socket"; break; |
|
506 |
default: resource_nodetype = "resource"; break; |
|
507 |
} |
|
508 |
||
509 |
#define RESOURCE_NAME_SZ 128 /* Maximum length of the resource name */ |
|
510 |
resource_name = kmem_alloc(RESOURCE_NAME_SZ, KM_SLEEP); |
|
511 |
svfsp = kmem_alloc(sizeof (statvfs64_t), KM_SLEEP); |
|
512 |
||
513 |
error = VFS_STATVFS(filevp->v_vfsp, svfsp); |
|
514 |
if (error == 0) { |
|
515 |
(void) snprintf(resource_name, RESOURCE_NAME_SZ, |
|
516 |
"unspecified_%s_%s", svfsp->f_basetype, resource_nodetype); |
|
517 |
} else { |
|
518 |
(void) snprintf(resource_name, RESOURCE_NAME_SZ, |
|
519 |
"unspecified_%s", resource_nodetype); |
|
520 |
} |
|
521 |
||
522 |
vfs_setresource(vfsp, resource_name); |
|
523 |
||
524 |
kmem_free(svfsp, sizeof (statvfs64_t)); |
|
525 |
kmem_free(resource_name, RESOURCE_NAME_SZ); |
|
526 |
#undef RESOURCE_NAME_SZ |
|
527 |
||
528 |
/* |
|
529 |
* Insert the namenode. |
|
530 |
*/ |
|
531 |
mutex_enter(&ntable_lock); |
|
532 |
nameinsert(nodep); |
|
533 |
mutex_exit(&ntable_lock); |
|
534 |
return (0); |
|
535 |
out: |
|
536 |
releasef(namefdp.fd); |
|
537 |
kmem_free(nodep, sizeof (struct namenode)); |
|
538 |
return (error); |
|
539 |
} |
|
540 |
||
541 |
/* |
|
542 |
* Unmount a file descriptor from a node in the file system. |
|
543 |
* If the user is not the owner of the file and is not privileged, |
|
544 |
* the request is denied. |
|
545 |
* Otherwise, remove the namenode from the hash list. |
|
546 |
* If the mounted file descriptor was that of a stream and this |
|
547 |
* was the last mount of the stream, turn off the STRMOUNT flag. |
|
548 |
* If the rootvp is referenced other than through the mount, |
|
549 |
* nm_inactive will clean up. |
|
550 |
*/ |
|
551 |
static int |
|
552 |
nm_unmount(vfs_t *vfsp, int flag, cred_t *crp) |
|
553 |
{ |
|
554 |
struct namenode *nodep = (struct namenode *)vfsp->vfs_data; |
|
555 |
vnode_t *vp, *thisvp; |
|
556 |
struct file *fp = NULL; |
|
557 |
||
558 |
ASSERT((nodep->nm_flag & NMNMNT) == 0); |
|
559 |
||
560 |
/* |
|
561 |
* forced unmount is not supported by this file system |
|
562 |
* and thus, ENOTSUP, is being returned. |
|
563 |
*/ |
|
564 |
if (flag & MS_FORCE) { |
|
565 |
return (ENOTSUP); |
|
566 |
} |
|
567 |
||
568 |
vp = nodep->nm_filevp; |
|
569 |
mutex_enter(&nodep->nm_lock); |
|
570 |
if (secpolicy_vnode_owner(crp, nodep->nm_vattr.va_uid) != 0) { |
|
571 |
mutex_exit(&nodep->nm_lock); |
|
572 |
return (EPERM); |
|
573 |
} |
|
574 |
||
575 |
mutex_exit(&nodep->nm_lock); |
|
576 |
||
577 |
mutex_enter(&ntable_lock); |
|
578 |
nameremove(nodep); |
|
579 |
thisvp = NMTOV(nodep); |
|
580 |
mutex_enter(&thisvp->v_lock); |
|
581 |
if (thisvp->v_count-- == 1) { |
|
582 |
fp = nodep->nm_filep; |
|
583 |
mutex_exit(&thisvp->v_lock); |
|
584 |
vn_invalid(thisvp); |
|
585 |
vn_free(thisvp); |
|
586 |
namenodeno_free(nodep->nm_vattr.va_nodeid); |
|
587 |
kmem_free(nodep, sizeof (struct namenode)); |
|
588 |
} else { |
|
589 |
thisvp->v_flag &= ~VROOT; |
|
590 |
thisvp->v_vfsp = &namevfs; |
|
591 |
mutex_exit(&thisvp->v_lock); |
|
592 |
} |
|
593 |
if (namefind(vp, NULLVP) == NULL && vp->v_stream) { |
|
594 |
struct stdata *stp = vp->v_stream; |
|
595 |
mutex_enter(&stp->sd_lock); |
|
596 |
stp->sd_flag &= ~STRMOUNT; |
|
597 |
mutex_exit(&stp->sd_lock); |
|
598 |
} |
|
599 |
mutex_exit(&ntable_lock); |
|
600 |
if (fp != NULL) |
|
601 |
(void) closef(fp); |
|
602 |
return (0); |
|
603 |
} |
|
604 |
||
605 |
/* |
|
606 |
* Create a reference to the root of a mounted file descriptor. |
|
607 |
* This routine is called from lookupname() in the event a path |
|
608 |
* is being searched that has a mounted file descriptor in it. |
|
609 |
*/ |
|
610 |
static int |
|
611 |
nm_root(vfs_t *vfsp, vnode_t **vpp) |
|
612 |
{ |
|
613 |
struct namenode *nodep = (struct namenode *)vfsp->vfs_data; |
|
614 |
struct vnode *vp = NMTOV(nodep); |
|
615 |
||
616 |
VN_HOLD(vp); |
|
617 |
*vpp = vp; |
|
618 |
return (0); |
|
619 |
} |
|
620 |
||
621 |
/* |
|
622 |
* Return in sp the status of this file system. |
|
623 |
*/ |
|
624 |
static int |
|
625 |
nm_statvfs(vfs_t *vfsp, struct statvfs64 *sp) |
|
626 |
{ |
|
627 |
dev32_t d32; |
|
628 |
||
629 |
bzero(sp, sizeof (*sp)); |
|
630 |
sp->f_bsize = 1024; |
|
631 |
sp->f_frsize = 1024; |
|
632 |
(void) cmpldev(&d32, vfsp->vfs_dev); |
|
633 |
sp->f_fsid = d32; |
|
634 |
(void) strcpy(sp->f_basetype, vfssw[vfsp->vfs_fstype].vsw_name); |
|
635 |
sp->f_flag = vf_to_stf(vfsp->vfs_flag); |
|
636 |
return (0); |
|
637 |
} |
|
638 |
||
639 |
/* |
|
640 |
* Since this file system has no disk blocks of its own, apply |
|
641 |
* the VOP_FSYNC operation on the mounted file descriptor. |
|
642 |
*/ |
|
643 |
static int |
|
644 |
nm_sync(vfs_t *vfsp, short flag, cred_t *crp) |
|
645 |
{ |
|
646 |
struct namenode *nodep; |
|
647 |
||
648 |
if (vfsp == NULL) |
|
649 |
return (0); |
|
650 |
||
651 |
nodep = (struct namenode *)vfsp->vfs_data; |
|
652 |
if (flag & SYNC_CLOSE) |
|
653 |
return (nm_umountall(nodep->nm_filevp, crp)); |
|
654 |
||
5331 | 655 |
return (VOP_FSYNC(nodep->nm_filevp, FSYNC, crp, NULL)); |
0 | 656 |
} |
657 |
||
658 |
/* |
|
659 |
* File system initialization routine. Save the file system type, |
|
660 |
* establish a file system device number and initialize nm_filevp_hash[]. |
|
661 |
*/ |
|
662 |
int |
|
663 |
nameinit(int fstype, char *name) |
|
664 |
{ |
|
665 |
static const fs_operation_def_t nm_vfsops_template[] = { |
|
3898
c788126f2a20
PSARC/2007/124 Strong Type-Checking for VFS Operation Registration Mechanism
rsb
parents:
2678
diff
changeset
|
666 |
VFSNAME_MOUNT, { .vfs_mount = nm_mount }, |
c788126f2a20
PSARC/2007/124 Strong Type-Checking for VFS Operation Registration Mechanism
rsb
parents:
2678
diff
changeset
|
667 |
VFSNAME_UNMOUNT, { .vfs_unmount = nm_unmount }, |
c788126f2a20
PSARC/2007/124 Strong Type-Checking for VFS Operation Registration Mechanism
rsb
parents:
2678
diff
changeset
|
668 |
VFSNAME_ROOT, { .vfs_root = nm_root }, |
c788126f2a20
PSARC/2007/124 Strong Type-Checking for VFS Operation Registration Mechanism
rsb
parents:
2678
diff
changeset
|
669 |
VFSNAME_STATVFS, { .vfs_statvfs = nm_statvfs }, |
c788126f2a20
PSARC/2007/124 Strong Type-Checking for VFS Operation Registration Mechanism
rsb
parents:
2678
diff
changeset
|
670 |
VFSNAME_SYNC, { .vfs_sync = nm_sync }, |
c788126f2a20
PSARC/2007/124 Strong Type-Checking for VFS Operation Registration Mechanism
rsb
parents:
2678
diff
changeset
|
671 |
NULL, NULL |
0 | 672 |
}; |
673 |
static const fs_operation_def_t nm_dummy_vfsops_template[] = { |
|
3898
c788126f2a20
PSARC/2007/124 Strong Type-Checking for VFS Operation Registration Mechanism
rsb
parents:
2678
diff
changeset
|
674 |
VFSNAME_STATVFS, { .vfs_statvfs = nm_statvfs }, |
c788126f2a20
PSARC/2007/124 Strong Type-Checking for VFS Operation Registration Mechanism
rsb
parents:
2678
diff
changeset
|
675 |
VFSNAME_SYNC, { .vfs_sync = nm_sync }, |
c788126f2a20
PSARC/2007/124 Strong Type-Checking for VFS Operation Registration Mechanism
rsb
parents:
2678
diff
changeset
|
676 |
NULL, NULL |
0 | 677 |
}; |
678 |
int error; |
|
679 |
int dev; |
|
680 |
vfsops_t *namefs_vfsops; |
|
681 |
vfsops_t *dummy_vfsops; |
|
682 |
||
683 |
error = vfs_setfsops(fstype, nm_vfsops_template, &namefs_vfsops); |
|
684 |
if (error != 0) { |
|
685 |
cmn_err(CE_WARN, "nameinit: bad vfs ops template"); |
|
686 |
return (error); |
|
687 |
} |
|
688 |
||
689 |
error = vfs_makefsops(nm_dummy_vfsops_template, &dummy_vfsops); |
|
690 |
if (error != 0) { |
|
691 |
(void) vfs_freevfsops_by_type(fstype); |
|
692 |
cmn_err(CE_WARN, "nameinit: bad dummy vfs ops template"); |
|
693 |
return (error); |
|
694 |
} |
|
695 |
||
696 |
error = vn_make_ops(name, nm_vnodeops_template, &nm_vnodeops); |
|
697 |
if (error != 0) { |
|
698 |
(void) vfs_freevfsops_by_type(fstype); |
|
699 |
vfs_freevfsops(dummy_vfsops); |
|
700 |
cmn_err(CE_WARN, "nameinit: bad vnode ops template"); |
|
701 |
return (error); |
|
702 |
} |
|
703 |
||
704 |
namefstype = fstype; |
|
705 |
||
706 |
if ((dev = getudev()) == (major_t)-1) { |
|
707 |
cmn_err(CE_WARN, "nameinit: can't get unique device"); |
|
708 |
dev = 0; |
|
709 |
} |
|
710 |
mutex_init(&ntable_lock, NULL, MUTEX_DEFAULT, NULL); |
|
711 |
namedev = makedevice(dev, 0); |
|
712 |
bzero(nm_filevp_hash, sizeof (nm_filevp_hash)); |
|
713 |
vfs_setops(&namevfs, dummy_vfsops); |
|
714 |
namevfs.vfs_vnodecovered = NULL; |
|
715 |
namevfs.vfs_bsize = 1024; |
|
716 |
namevfs.vfs_fstype = namefstype; |
|
717 |
vfs_make_fsid(&namevfs.vfs_fsid, namedev, namefstype); |
|
718 |
namevfs.vfs_dev = namedev; |
|
719 |
return (0); |
|
720 |
} |
|
721 |
||
722 |
static mntopts_t nm_mntopts = { |
|
723 |
NULL, |
|
724 |
0 |
|
725 |
}; |
|
726 |
||
727 |
static vfsdef_t vfw = { |
|
728 |
VFSDEF_VERSION, |
|
729 |
"namefs", |
|
730 |
nameinit, |
|
731 |
VSW_HASPROTO, |
|
732 |
&nm_mntopts |
|
733 |
}; |
|
734 |
||
735 |
/* |
|
736 |
* Module linkage information for the kernel. |
|
737 |
*/ |
|
738 |
static struct modlfs modlfs = { |
|
739 |
&mod_fsops, "filesystem for namefs", &vfw |
|
740 |
}; |
|
741 |
||
742 |
static struct modlinkage modlinkage = { |
|
743 |
MODREV_1, (void *)&modlfs, NULL |
|
744 |
}; |
|
745 |
||
746 |
int |
|
747 |
_init(void) |
|
748 |
{ |
|
749 |
namenodeno_init(); |
|
750 |
return (mod_install(&modlinkage)); |
|
751 |
} |
|
752 |
||
753 |
int |
|
754 |
_fini(void) |
|
755 |
{ |
|
756 |
return (EBUSY); |
|
757 |
} |
|
758 |
||
759 |
int |
|
760 |
_info(struct modinfo *modinfop) |
|
761 |
{ |
|
762 |
return (mod_info(&modlinkage, modinfop)); |
|
763 |
} |