xref: /netbsd-src/sys/fs/v7fs/v7fs_vfsops.c (revision 946379e7b37692fc43f68eb0d1c10daa0a7f3b6c) 
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
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
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
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
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
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
293 v7fs_start(struct mount *mp, int flags)
294 {
295 
296 	DPRINTF("\n");
297 	/* Nothing to do. */
298 	return 0;
299 }
300 
301 int
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
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
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
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
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
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
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
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
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
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
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
536 v7fs_reinit(void)
537 {
538 
539 	/* Nothing to do. */
540 	DPRINTF("\n");
541 }
542 
543 void
544 v7fs_done(void)
545 {
546 
547 	DPRINTF("\n");
548 	pool_destroy(&v7fs_node_pool);
549 }
550 
551 int
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
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