1 /* $NetBSD: v7fs_vfsops.c,v 1.12 2014/12/29 15:29:38 hannken Exp $ */
2
3 /*-
4 * Copyright (c) 2004, 2011 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by UCHIYAMA Yasushi.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
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 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: v7fs_vfsops.c,v 1.12 2014/12/29 15:29:38 hannken Exp $");
34 #if defined _KERNEL_OPT
35 #include "opt_v7fs.h"
36 #endif
37
38 #include <sys/types.h>
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/pool.h>
42 #include <sys/time.h>
43 #include <sys/ucred.h>
44 #include <sys/mount.h>
45 #include <sys/disk.h>
46 #include <sys/device.h>
47 #include <sys/fcntl.h>
48 #include <sys/kmem.h>
49 #include <sys/kauth.h>
50 #include <sys/proc.h>
51
52 /* v-node */
53 #include <sys/namei.h>
54 #include <sys/vnode.h>
55 /* devsw */
56 #include <sys/conf.h>
57
58 #include "v7fs_extern.h"
59 #include "v7fs.h"
60 #include "v7fs_impl.h"
61 #include "v7fs_inode.h"
62 #include "v7fs_superblock.h"
63
64 #ifdef V7FS_VFSOPS_DEBUG
65 #define DPRINTF(fmt, args...) printf("%s: " fmt, __func__, ##args)
66 #else
67 #define DPRINTF(arg...) ((void)0)
68 #endif
69
70 struct pool v7fs_node_pool;
71
72 static int v7fs_mountfs(struct vnode *, struct mount *, int);
73 static int v7fs_openfs(struct vnode *, struct mount *, struct lwp *);
74 static void v7fs_closefs(struct vnode *, struct mount *);
75 static int is_v7fs_partition(struct vnode *);
76 static enum vtype v7fs_mode_to_vtype(v7fs_mode_t mode);
77
78 int
v7fs_mount(struct mount * mp,const char * path,void * data,size_t * data_len)79 v7fs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
80 {
81 struct lwp *l = curlwp;
82 struct v7fs_args *args = data;
83 struct v7fs_mount *v7fsmount = (void *)mp->mnt_data;
84 struct vnode *devvp = NULL;
85 int error = 0;
86 bool update = mp->mnt_flag & MNT_UPDATE;
87
88 DPRINTF("mnt_flag=%x %s\n", mp->mnt_flag, update ? "update" : "");
89
90 if (args == NULL)
91 return EINVAL;
92 if (*data_len < sizeof(*args))
93 return EINVAL;
94
95 if (mp->mnt_flag & MNT_GETARGS) {
96 if (!v7fsmount)
97 return EIO;
98 args->fspec = NULL;
99 args->endian = v7fsmount->core->endian;
100 *data_len = sizeof(*args);
101 return 0;
102 }
103
104 DPRINTF("args->fspec=%s endian=%d\n", args->fspec, args->endian);
105 if (args->fspec == NULL) {
106 /* nothing to do. */
107 return EINVAL;
108 }
109
110 if (args->fspec != NULL) {
111 /* Look up the name and verify that it's sane. */
112 error = namei_simple_user(args->fspec,
113 NSM_FOLLOW_NOEMULROOT, &devvp);
114 if (error != 0)
115 return (error);
116 DPRINTF("mount device=%lx\n", (long)devvp->v_rdev);
117
118 if (!update) {
119 /*
120 * Be sure this is a valid block device
121 */
122 if (devvp->v_type != VBLK)
123 error = ENOTBLK;
124 else if (bdevsw_lookup(devvp->v_rdev) == NULL)
125 error = ENXIO;
126 } else {
127 KDASSERT(v7fsmount);
128 /*
129 * Be sure we're still naming the same device
130 * used for our initial mount
131 */
132 if (devvp != v7fsmount->devvp) {
133 DPRINTF("devvp %p != %p rootvp=%p\n", devvp,
134 v7fsmount->devvp, rootvp);
135 if (rootvp == v7fsmount->devvp) {
136 vrele(devvp);
137 devvp = rootvp;
138 vref(devvp);
139 } else {
140 error = EINVAL;
141 }
142 }
143 }
144 }
145
146 /*
147 * If mount by non-root, then verify that user has necessary
148 * permissions on the device.
149 *
150 * Permission to update a mount is checked higher, so here we presume
151 * updating the mount is okay (for example, as far as securelevel goes)
152 * which leaves us with the normal check.
153 */
154 if (error == 0) {
155 int accessmode = VREAD;
156 if (update ?
157 (mp->mnt_iflag & IMNT_WANTRDWR) != 0 :
158 (mp->mnt_flag & MNT_RDONLY) == 0)
159 accessmode |= VWRITE;
160 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
161 KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp,
162 KAUTH_ARG(accessmode));
163 }
164
165 if (error) {
166 vrele(devvp);
167 return error;
168 }
169
170 if (!update) {
171 if ((error = v7fs_openfs(devvp, mp, l))) {
172 vrele(devvp);
173 return error;
174 }
175
176 if ((error = v7fs_mountfs(devvp, mp, args->endian))) {
177 v7fs_closefs(devvp, mp);
178 VOP_UNLOCK(devvp);
179 vrele(devvp);
180 return error;
181 }
182 VOP_UNLOCK(devvp);
183 } else if (mp->mnt_flag & MNT_RDONLY) {
184 /* XXX: r/w -> read only */
185 }
186
187 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE,
188 mp->mnt_op->vfs_name, mp, l);
189 }
190
191 static int
is_v7fs_partition(struct vnode * devvp)192 is_v7fs_partition(struct vnode *devvp)
193 {
194 struct dkwedge_info dkw;
195 int error;
196
197 if ((error = getdiskinfo(devvp, &dkw)) != 0) {
198 DPRINTF("getdiskinfo=%d\n", error);
199 return error;
200 }
201 DPRINTF("ptype=%s size=%" PRIu64 "\n", dkw.dkw_ptype, dkw->dkw_size);
202
203 return strcmp(dkw.dkw_ptype, DKW_PTYPE_V7) == 0 ? 0 : EINVAL;
204 }
205
206 static int
v7fs_openfs(struct vnode * devvp,struct mount * mp,struct lwp * l)207 v7fs_openfs(struct vnode *devvp, struct mount *mp, struct lwp *l)
208 {
209 kauth_cred_t cred = l->l_cred;
210 int oflags;
211 int error;
212
213 /* Flush buffer */
214 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
215 if ((error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0)))
216 goto unlock_exit;
217
218 /* Open block device */
219 oflags = FREAD;
220 if ((mp->mnt_flag & MNT_RDONLY) == 0)
221 oflags |= FWRITE;
222
223 if ((error = VOP_OPEN(devvp, oflags, NOCRED)) != 0) {
224 DPRINTF("VOP_OPEN=%d\n", error);
225 goto unlock_exit;
226 }
227
228 return 0; /* lock held */
229
230 unlock_exit:
231 VOP_UNLOCK(devvp);
232
233 return error;
234 }
235
236 static void
v7fs_closefs(struct vnode * devvp,struct mount * mp)237 v7fs_closefs(struct vnode *devvp, struct mount *mp)
238 {
239 int oflags = FREAD;
240
241 if ((mp->mnt_flag & MNT_RDONLY) == 0)
242 oflags |= FWRITE;
243
244 VOP_CLOSE(devvp, oflags, NOCRED);
245 }
246
247 static int
v7fs_mountfs(struct vnode * devvp,struct mount * mp,int endian)248 v7fs_mountfs(struct vnode *devvp, struct mount *mp, int endian)
249 {
250 struct v7fs_mount *v7fsmount;
251 int error;
252 struct v7fs_mount_device mount;
253
254 DPRINTF("%d\n",endian);
255
256 v7fsmount = kmem_zalloc(sizeof(*v7fsmount), KM_SLEEP);
257 if (v7fsmount == NULL) {
258 return ENOMEM;
259 }
260 v7fsmount->devvp = devvp;
261 v7fsmount->mountp = mp;
262
263 mount.device.vnode = devvp;
264 mount.endian = endian;
265
266 if ((error = v7fs_io_init(&v7fsmount->core, &mount, V7FS_BSIZE))) {
267 goto err_exit;
268 }
269 struct v7fs_self *fs = v7fsmount->core;
270
271 if ((error = v7fs_superblock_load(fs))) {
272 v7fs_io_fini(fs);
273 goto err_exit;
274 }
275
276 mp->mnt_data = v7fsmount;
277 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)devvp->v_rdev;
278 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_V7FS);
279 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
280 mp->mnt_stat.f_namemax = V7FS_NAME_MAX;
281 mp->mnt_flag |= MNT_LOCAL;
282 mp->mnt_dev_bshift = V7FS_BSHIFT;
283 mp->mnt_fs_bshift = V7FS_BSHIFT;
284
285 return 0;
286
287 err_exit:
288 kmem_free(v7fsmount, sizeof(*v7fsmount));
289 return error;
290 }
291
292 int
v7fs_start(struct mount * mp,int flags)293 v7fs_start(struct mount *mp, int flags)
294 {
295
296 DPRINTF("\n");
297 /* Nothing to do. */
298 return 0;
299 }
300
301 int
v7fs_unmount(struct mount * mp,int mntflags)302 v7fs_unmount(struct mount *mp, int mntflags)
303 {
304 struct v7fs_mount *v7fsmount = (void *)mp->mnt_data;
305 int error;
306
307 DPRINTF("%p\n", v7fsmount);
308
309 if ((error = vflush(mp, NULLVP,
310 mntflags & MNT_FORCE ? FORCECLOSE : 0)) != 0)
311 return error;
312
313 vn_lock(v7fsmount->devvp, LK_EXCLUSIVE | LK_RETRY);
314 error = VOP_CLOSE(v7fsmount->devvp, FREAD, NOCRED);
315 vput(v7fsmount->devvp);
316
317 v7fs_io_fini(v7fsmount->core);
318
319 kmem_free(v7fsmount, sizeof(*v7fsmount));
320 mp->mnt_data = NULL;
321 mp->mnt_flag &= ~MNT_LOCAL;
322
323 return 0;
324 }
325
326 int
v7fs_root(struct mount * mp,struct vnode ** vpp)327 v7fs_root(struct mount *mp, struct vnode **vpp)
328 {
329 struct vnode *vp;
330 int error;
331
332 DPRINTF("\n");
333 if ((error = VFS_VGET(mp, V7FS_ROOT_INODE, &vp)) != 0) {
334 DPRINTF("error=%d\n", error);
335 return error;
336 }
337 *vpp = vp;
338 DPRINTF("done.\n");
339
340 return 0;
341 }
342
343 int
v7fs_statvfs(struct mount * mp,struct statvfs * f)344 v7fs_statvfs(struct mount *mp, struct statvfs *f)
345 {
346 struct v7fs_mount *v7fsmount = mp->mnt_data;
347 struct v7fs_self *fs = v7fsmount->core;
348
349 DPRINTF("scratch remain=%d\n", fs->scratch_remain);
350
351 v7fs_superblock_status(fs);
352
353 f->f_bsize = V7FS_BSIZE;
354 f->f_frsize = V7FS_BSIZE;
355 f->f_iosize = V7FS_BSIZE;
356 f->f_blocks = fs->stat.total_blocks;
357 f->f_bfree = fs->stat.free_blocks;
358 f->f_bavail = fs->stat.free_blocks;
359 f->f_bresvd = 0;
360 f->f_files = fs->stat.total_files;
361 f->f_ffree = fs->stat.free_inode;
362 f->f_favail = f->f_ffree;
363 f->f_fresvd = 0;
364 copy_statvfs_info(f, mp);
365
366 return 0;
367 }
368
369 static bool
v7fs_sync_selector(void * cl,struct vnode * vp)370 v7fs_sync_selector(void *cl, struct vnode *vp)
371 {
372 struct v7fs_node *v7fs_node = vp->v_data;
373
374 if (v7fs_node == NULL)
375 return false;
376 if (!v7fs_inode_allocated(&v7fs_node->inode))
377 return false;
378
379 return true;
380 }
381
382 int
v7fs_sync(struct mount * mp,int waitfor,kauth_cred_t cred)383 v7fs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
384 {
385 struct v7fs_mount *v7fsmount = mp->mnt_data;
386 struct v7fs_self *fs = v7fsmount->core;
387 struct vnode_iterator *marker;
388 struct vnode *vp;
389 int err, error;
390
391 DPRINTF("\n");
392
393 v7fs_superblock_writeback(fs);
394 error = 0;
395 vfs_vnode_iterator_init(mp, &marker);
396 while ((vp = vfs_vnode_iterator_next(marker,
397 v7fs_sync_selector, NULL)) != NULL) {
398 err = vn_lock(vp, LK_EXCLUSIVE);
399 if (err) {
400 vrele(vp);
401 continue;
402 }
403 err = VOP_FSYNC(vp, cred, FSYNC_WAIT, 0, 0);
404 vput(vp);
405 if (err != 0)
406 error = err;
407 }
408 vfs_vnode_iterator_destroy(marker);
409
410 return error;
411 }
412
413 static enum vtype
v7fs_mode_to_vtype(v7fs_mode_t mode)414 v7fs_mode_to_vtype (v7fs_mode_t mode)
415 {
416 enum vtype table[] = { VCHR, VDIR, VBLK, VREG, VLNK, VSOCK };
417
418 if ((mode & V7FS_IFMT) == V7FSBSD_IFFIFO)
419 return VFIFO;
420
421 return table[((mode >> 13) & 7) - 1];
422 }
423
424 int
v7fs_loadvnode(struct mount * mp,struct vnode * vp,const void * key,size_t key_len,const void ** new_key)425 v7fs_loadvnode(struct mount *mp, struct vnode *vp,
426 const void *key, size_t key_len, const void **new_key)
427 {
428 struct v7fs_mount *v7fsmount;
429 struct v7fs_self *fs;
430 struct v7fs_node *v7fs_node;
431 struct v7fs_inode inode;
432 v7fs_ino_t number;
433 int error;
434
435 KASSERT(key_len == sizeof(number));
436 memcpy(&number, key, key_len);
437
438 v7fsmount = mp->mnt_data;
439 fs = v7fsmount->core;
440
441 /* Lookup requested i-node */
442 if ((error = v7fs_inode_load(fs, &inode, number))) {
443 DPRINTF("v7fs_inode_load failed.\n");
444 return error;
445 }
446
447 v7fs_node = pool_get(&v7fs_node_pool, PR_WAITOK);
448 memset(v7fs_node, 0, sizeof(*v7fs_node));
449
450 vp->v_tag = VT_V7FS;
451 vp->v_data = v7fs_node;
452 v7fs_node->vnode = vp;
453 v7fs_node->v7fsmount = v7fsmount;
454 v7fs_node->inode = inode;/*structure copy */
455 v7fs_node->lockf = NULL; /* advlock */
456
457 genfs_node_init(vp, &v7fs_genfsops);
458 uvm_vnp_setsize(vp, v7fs_inode_filesize(&inode));
459
460 if (number == V7FS_ROOT_INODE) {
461 vp->v_type = VDIR;
462 vp->v_vflag |= VV_ROOT;
463 vp->v_op = v7fs_vnodeop_p;
464 } else {
465 vp->v_type = v7fs_mode_to_vtype(inode.mode);
466
467 if (vp->v_type == VBLK || vp->v_type == VCHR) {
468 dev_t rdev = inode.device;
469 vp->v_op = v7fs_specop_p;
470 spec_node_init(vp, rdev);
471 } else if (vp->v_type == VFIFO) {
472 vp->v_op = v7fs_fifoop_p;
473 } else {
474 vp->v_op = v7fs_vnodeop_p;
475 }
476 }
477
478 *new_key = &v7fs_node->inode.inode_number;
479
480 return 0;
481 }
482
483
484 int
v7fs_vget(struct mount * mp,ino_t ino,struct vnode ** vpp)485 v7fs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
486 {
487 int error;
488 v7fs_ino_t number;
489 struct vnode *vp;
490
491 KASSERT(ino <= UINT16_MAX);
492 number = ino;
493
494 error = vcache_get(mp, &number, sizeof(number), &vp);
495 if (error)
496 return error;
497 error = vn_lock(vp, LK_EXCLUSIVE);
498 if (error) {
499 vrele(vp);
500 return error;
501 }
502
503 *vpp = vp;
504
505 return 0;
506 }
507
508 int
v7fs_fhtovp(struct mount * mp,struct fid * fid,struct vnode ** vpp)509 v7fs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp)
510 {
511
512 DPRINTF("\n");
513 /* notyet */
514 return EOPNOTSUPP;
515 }
516
517 int
v7fs_vptofh(struct vnode * vpp,struct fid * fid,size_t * fh_size)518 v7fs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size)
519 {
520
521 DPRINTF("\n");
522 /* notyet */
523 return EOPNOTSUPP;
524 }
525
526 void
v7fs_init(void)527 v7fs_init(void)
528 {
529
530 DPRINTF("\n");
531 pool_init(&v7fs_node_pool, sizeof(struct v7fs_node), 0, 0, 0,
532 "v7fs_node_pool", &pool_allocator_nointr, IPL_NONE);
533 }
534
535 void
v7fs_reinit(void)536 v7fs_reinit(void)
537 {
538
539 /* Nothing to do. */
540 DPRINTF("\n");
541 }
542
543 void
v7fs_done(void)544 v7fs_done(void)
545 {
546
547 DPRINTF("\n");
548 pool_destroy(&v7fs_node_pool);
549 }
550
551 int
v7fs_gop_alloc(struct vnode * vp,off_t off,off_t len,int flags,kauth_cred_t cred)552 v7fs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags,
553 kauth_cred_t cred)
554 {
555
556 DPRINTF("\n");
557 return 0;
558 }
559
560 int
v7fs_mountroot(void)561 v7fs_mountroot(void)
562 {
563 struct mount *mp;
564 int error;
565
566 DPRINTF("");
567 /* On mountroot, devvp (rootdev) is opened by vfs_mountroot */
568 if ((error = is_v7fs_partition (rootvp)))
569 return error;
570
571 if ((error = vfs_rootmountalloc(MOUNT_V7FS, "root_device", &mp))) {
572 DPRINTF("mountalloc error=%d\n", error);
573 vrele(rootvp);
574 return error;
575 }
576
577 if ((error = v7fs_mountfs(rootvp, mp, _BYTE_ORDER))) {
578 DPRINTF("mountfs error=%d\n", error);
579 vfs_unbusy(mp, false, NULL);
580 vfs_destroy(mp);
581 return error;
582 }
583
584 mountlist_append(mp);
585
586 vfs_unbusy(mp, false, NULL);
587
588 return 0;
589 }
590