xref: /netbsd-src/sys/fs/v7fs/v7fs_vfsops.c (revision ca453df649ce9db45b64d73678ba06cbccf9aa11) 
1 /*	$NetBSD: v7fs_vfsops.c,v 1.2 2011/07/02 01:05:38 uch 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 1.2 2011/07/02 01:05:38 uch 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/disklabel.h>
46 #include <sys/fcntl.h>
47 #include <sys/malloc.h>
48 #include <sys/kauth.h>
49 #include <sys/proc.h>
50 
51 /* v-node */
52 #include <sys/namei.h>
53 #include <sys/vnode.h>
54 /* devsw */
55 #include <sys/conf.h>
56 
57 #include "v7fs_extern.h"
58 #include "v7fs.h"
59 #include "v7fs_impl.h"
60 #include "v7fs_inode.h"
61 #include "v7fs_superblock.h"
62 
63 #ifdef V7FS_VFSOPS_DEBUG
64 #define	DPRINTF(fmt, args...)	printf("%s: " fmt, __func__, ##args)
65 #else
66 #define	DPRINTF(arg...)		((void)0)
67 #endif
68 
69 MALLOC_JUSTDEFINE(M_V7FS_VFS, "v7fs vfs", "v7fs vfs structures");
70 
71 struct pool v7fs_node_pool;
72 
73 static int v7fs_mountfs(struct vnode *, struct mount *, int);
74 static int v7fs_openfs(struct vnode *, struct mount *, struct lwp *);
75 static void v7fs_closefs(struct vnode *, struct mount *);
76 static int is_v7fs_partition(struct vnode *);
77 static enum vtype v7fs_mode_to_vtype(v7fs_mode_t mode);
78 
79 int
80 v7fs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
81 {
82 	struct lwp *l = curlwp;
83 	struct v7fs_args *args = data;
84 	struct v7fs_mount *v7fsmount = (void *)mp->mnt_data;
85 	struct vnode *devvp = NULL;
86 	int error;
87 	bool update = mp->mnt_flag & MNT_UPDATE;
88 
89 	DPRINTF("mnt_flag=%x %s\n", mp->mnt_flag, update ? "update" : "");
90 
91 	if (*data_len < sizeof(*args))
92 		return EINVAL;
93 
94 	if (mp->mnt_flag & MNT_GETARGS) {
95 		if (!v7fsmount)
96 			return EIO;
97 		args->fspec = NULL;
98 		args->endian = v7fsmount->core->endian;
99 		*data_len = sizeof(*args);
100 		return 0;
101 	}
102 
103 	DPRINTF("args->fspec=%s endian=%d\n", args->fspec, args->endian);
104 	if (args->fspec == NULL) {
105 		/* nothing to do. */
106 		return EINVAL;
107 	}
108 
109 	if (args->fspec != NULL) {
110 		/* Look up the name and verify that it's sane. */
111 		error = namei_simple_user(args->fspec,
112 		    NSM_FOLLOW_NOEMULROOT, &devvp);
113 		if (error != 0)
114 			return (error);
115 		DPRINTF("mount device=%lx\n", (long)devvp->v_rdev);
116 
117 		if (!update) {
118 			/*
119 			 * Be sure this is a valid block device
120 			 */
121 			if (devvp->v_type != VBLK)
122 				error = ENOTBLK;
123 			else if (bdevsw_lookup(devvp->v_rdev) == NULL)
124 				error = ENXIO;
125 		} else {
126 			KDASSERT(v7fsmount);
127 			/*
128 			 * Be sure we're still naming the same device
129 			 * used for our initial mount
130 			 */
131 			if (devvp != v7fsmount->devvp) {
132 				DPRINTF("devvp %p != %p rootvp=%p\n", devvp,
133 				    v7fsmount->devvp, rootvp);
134 				if (rootvp == v7fsmount->devvp) {
135 					vrele(devvp);
136 					devvp = rootvp;
137 					vref(devvp);
138 				} else {
139 					error = EINVAL;
140 				}
141 			}
142 		}
143 	}
144 
145 	/*
146 	 * If mount by non-root, then verify that user has necessary
147 	 * permissions on the device.
148 	 *
149 	 * Permission to update a mount is checked higher, so here we presume
150 	 * updating the mount is okay (for example, as far as securelevel goes)
151 	 * which leaves us with the normal check.
152 	 */
153 	if (error == 0) {
154 		int accessmode = VREAD;
155 		if (update ?
156 		    (mp->mnt_iflag & IMNT_WANTRDWR) != 0 :
157 		    (mp->mnt_flag & MNT_RDONLY) == 0)
158 			accessmode |= VWRITE;
159 		error = genfs_can_mount(devvp, accessmode, l->l_cred);
160 	}
161 
162 	if (error) {
163 		vrele(devvp);
164 		return error;
165 	}
166 
167 	if (!update) {
168 		if ((error = v7fs_openfs(devvp, mp, l))) {
169 			vrele(devvp);
170 			return error;
171 		}
172 
173 		if ((error = v7fs_mountfs(devvp, mp, args->endian))) {
174 			v7fs_closefs(devvp, mp);
175 			VOP_UNLOCK(devvp);
176 			vrele(devvp);
177 			return error;
178 		}
179 		VOP_UNLOCK(devvp);
180 	} else 	if (mp->mnt_flag & MNT_RDONLY) {
181 		/* XXX: r/w -> read only */
182 	}
183 
184 	return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE,
185 	    mp->mnt_op->vfs_name, mp, l);
186 }
187 
188 static int
189 is_v7fs_partition(struct vnode *devvp)
190 {
191 	struct partinfo dpart;
192 	int error;
193 
194 	if ((error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED)) != 0) {
195 		DPRINTF("VOP_IOCTL=%d\n", error);
196 		return error;
197 	}
198 	DPRINTF("fstype=%d dtype=%d bsize=%d\n", dpart.part->p_fstype,
199 	    dpart.disklab->d_type, dpart.disklab->d_secsize);
200 
201 	return (dpart.part->p_fstype == FS_V7) ? 0 : EINVAL;
202 }
203 
204 static int
205 v7fs_openfs(struct vnode *devvp, struct mount *mp, struct lwp *l)
206 {
207 	kauth_cred_t cred = l->l_cred;
208 	int oflags;
209 	int error;
210 
211 	/* Flush buffer */
212 	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
213 	if ((error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0)))
214 		goto unlock_exit;
215 
216 	/* Open block device */
217 	oflags = FREAD;
218 	if ((mp->mnt_flag & MNT_RDONLY) == 0)
219 		oflags |= FWRITE;
220 
221 	if ((error = VOP_OPEN(devvp, oflags, NOCRED)) != 0) {
222 		DPRINTF("VOP_OPEN=%d\n", error);
223 		goto unlock_exit;
224 	}
225 
226 	/* Get partition information */
227 	if ((error = is_v7fs_partition(devvp))) {
228 		goto close_exit;
229 	}
230 
231 	return 0; /* lock held */
232 
233 close_exit:
234 	VOP_CLOSE(devvp, oflags, NOCRED);
235 unlock_exit:
236 	VOP_UNLOCK(devvp);
237 
238 	return error;
239 }
240 
241 static void
242 v7fs_closefs(struct vnode *devvp, struct mount *mp)
243 {
244 	int oflags = FREAD;
245 
246 	if ((mp->mnt_flag & MNT_RDONLY) == 0)
247 		oflags |= FWRITE;
248 
249 	VOP_CLOSE(devvp, oflags, NOCRED);
250 }
251 
252 static int
253 v7fs_mountfs(struct vnode *devvp, struct mount *mp, int endian)
254 {
255 	struct v7fs_mount *v7fsmount;
256 	int error;
257 	struct v7fs_mount_device mount;
258 
259 	DPRINTF("%d\n",endian);
260 
261 	v7fsmount = malloc(sizeof(*v7fsmount), M_V7FS_VFS, M_WAITOK);
262 	if (v7fsmount == NULL) {
263 		return ENOMEM;
264 	}
265 	v7fsmount->devvp = devvp;
266 	v7fsmount->mountp = mp;
267 
268 	mount.device.vnode = devvp;
269 	mount.endian = endian;
270 
271 	if ((error = v7fs_io_init(&v7fsmount->core, &mount, V7FS_BSIZE))) {
272 		goto err_exit;
273 	}
274 	struct v7fs_self *fs = v7fsmount->core;
275 
276 	if ((error = v7fs_superblock_load(fs))) {
277 		v7fs_io_fini(fs);
278 		goto err_exit;
279 	}
280 
281 	LIST_INIT(&v7fsmount->v7fs_node_head);
282 
283 	mp->mnt_data = v7fsmount;
284 	mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)devvp->v_rdev;
285 	mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_V7FS);
286 	mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
287 	mp->mnt_stat.f_namemax = V7FS_NAME_MAX;
288 	mp->mnt_flag |= MNT_LOCAL;
289 	mp->mnt_dev_bshift = V7FS_BSHIFT;
290 	mp->mnt_fs_bshift = V7FS_BSHIFT;
291 
292 	return 0;
293 
294 err_exit:
295 	free(v7fsmount, M_V7FS_VFS);
296 	return error;
297 }
298 
299 int
300 v7fs_start(struct mount *mp, int flags)
301 {
302 
303 	DPRINTF("\n");
304 	/* Nothing to do. */
305 	return 0;
306 }
307 
308 int
309 v7fs_unmount(struct mount *mp, int mntflags)
310 {
311 	struct v7fs_mount *v7fsmount = (void *)mp->mnt_data;
312 	int error;
313 
314 	DPRINTF("%p\n", v7fsmount);
315 
316 	if ((error = vflush(mp, NULLVP,
317 		    mntflags & MNT_FORCE ? FORCECLOSE : 0)) != 0)
318 		return error;
319 
320 	vn_lock(v7fsmount->devvp, LK_EXCLUSIVE | LK_RETRY);
321 	error = VOP_CLOSE(v7fsmount->devvp, FREAD, NOCRED);
322 	vput(v7fsmount->devvp);
323 
324 	v7fs_io_fini(v7fsmount->core);
325 
326 	free(v7fsmount, M_V7FS_VFS);
327 	mp->mnt_data = NULL;
328 	mp->mnt_flag &= ~MNT_LOCAL;
329 
330 	return 0;
331 }
332 
333 int
334 v7fs_root(struct mount *mp, struct vnode **vpp)
335 {
336 	struct vnode *vp;
337 	int error;
338 
339 	DPRINTF("\n");
340 	if ((error = VFS_VGET(mp, V7FS_ROOT_INODE, &vp)) != 0) {
341 		DPRINTF("error=%d\n", error);
342 		return error;
343 	}
344 	*vpp = vp;
345 	DPRINTF("done.\n");
346 
347 	return 0;
348 }
349 
350 int
351 v7fs_statvfs(struct mount *mp, struct statvfs *f)
352 {
353 	struct v7fs_mount *v7fsmount = mp->mnt_data;
354 	struct v7fs_self *fs = v7fsmount->core;
355 
356 	DPRINTF("scratch remain=%d\n", fs->scratch_remain);
357 
358 	v7fs_superblock_status(fs);
359 
360 	f->f_bsize = V7FS_BSIZE;
361 	f->f_frsize = V7FS_BSIZE;
362 	f->f_iosize = V7FS_BSIZE;
363 	f->f_blocks = fs->stat.total_blocks;
364 	f->f_bfree = fs->stat.free_blocks;
365 	f->f_bavail = fs->stat.free_blocks;
366 	f->f_bresvd = 0;
367 	f->f_files = fs->stat.total_files;
368 	f->f_ffree = fs->stat.free_inode;
369 	f->f_favail = f->f_ffree;
370 	f->f_fresvd = 0;
371 	copy_statvfs_info(f, mp);
372 
373 	return 0;
374 }
375 
376 int
377 v7fs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
378 {
379 	struct v7fs_mount *v7fsmount = mp->mnt_data;
380 	struct v7fs_self *fs = v7fsmount->core;
381 	struct v7fs_node *v7fs_node;
382 	struct v7fs_inode *inode;
383 	struct vnode *v;
384 	int err, error;
385 	int retry_cnt;
386 
387 	DPRINTF("\n");
388 
389 	v7fs_superblock_writeback(fs);
390 	for (retry_cnt = 0; retry_cnt < 2; retry_cnt++) {
391 		error = 0;
392 
393 		mutex_enter(&mntvnode_lock);
394 		for (v7fs_node = LIST_FIRST(&v7fsmount->v7fs_node_head);
395 		    v7fs_node != NULL; v7fs_node = LIST_NEXT(v7fs_node, link)) {
396 			inode = &v7fs_node->inode;
397 			if (!v7fs_inode_allocated(inode)) {
398 				continue;
399 			}
400 			v = v7fs_node->vnode;
401 			mutex_enter(v->v_interlock);
402 			mutex_exit(&mntvnode_lock);
403 			err = vget(v, LK_EXCLUSIVE | LK_NOWAIT);
404 			if (err == 0) {
405 				err = VOP_FSYNC(v, cred, FSYNC_WAIT, 0, 0);
406 				vput(v);
407 			}
408 			if (err != 0)
409 				error = err;
410 			mutex_enter(&mntvnode_lock);
411 		}
412 		mutex_exit(&mntvnode_lock);
413 
414 		if (error == 0)
415 			break;
416 	}
417 
418 	return error;
419 }
420 
421 static enum vtype
422 v7fs_mode_to_vtype (v7fs_mode_t mode)
423 {
424 	enum vtype table[] = { VCHR, VDIR, VBLK, VREG, VLNK, VSOCK };
425 
426 	if ((mode & V7FS_IFMT) == V7FSBSD_IFFIFO)
427 		return VFIFO;
428 
429 	return table[((mode >> 13) & 7) - 1];
430 }
431 
432 int
433 v7fs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
434 {
435 	struct v7fs_mount *v7fsmount = mp->mnt_data;
436 	struct v7fs_self *fs = v7fsmount->core;
437 	struct vnode *vp;
438 	struct v7fs_node *v7fs_node;
439 	struct v7fs_inode inode;
440 	int error;
441 
442 	/* Lookup requested i-node */
443 	if ((error = v7fs_inode_load(fs, &inode, ino))) {
444 		DPRINTF("v7fs_inode_load failed.\n");
445 		return error;
446 	}
447 
448 retry:
449 	mutex_enter(&mntvnode_lock);
450 	for (v7fs_node = LIST_FIRST(&v7fsmount->v7fs_node_head);
451 	    v7fs_node != NULL; v7fs_node = LIST_NEXT(v7fs_node, link)) {
452 		if (v7fs_node->inode.inode_number == ino) {
453 			vp = v7fs_node->vnode;
454 			mutex_enter(vp->v_interlock);
455 			mutex_exit(&mntvnode_lock);
456 			if (vget(vp, LK_EXCLUSIVE) == 0) {
457 				*vpp = vp;
458 				return 0;
459 			} else {
460 				DPRINTF("retry!\n");
461 				goto retry;
462 			}
463 		}
464 	}
465 	mutex_exit(&mntvnode_lock);
466 
467 	/* Allocate v-node. */
468 	if ((error = getnewvnode(VT_V7FS, mp, v7fs_vnodeop_p, NULL, &vp))) {
469 		DPRINTF("getnewvnode error.\n");
470 		return error;
471 	}
472 	/* Lock vnode here */
473 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
474 
475 	/* Allocate i-node */
476 	vp->v_data = pool_get(&v7fs_node_pool, PR_WAITOK);
477 	memset(vp->v_data, 0, sizeof(*v7fs_node));
478 	v7fs_node = vp->v_data;
479 	mutex_enter(&mntvnode_lock);
480 	LIST_INSERT_HEAD(&v7fsmount->v7fs_node_head, v7fs_node, link);
481 	mutex_exit(&mntvnode_lock);
482 	v7fs_node->vnode = vp;
483 	v7fs_node->v7fsmount = v7fsmount;
484 	v7fs_node->inode = inode;/*structure copy */
485 	v7fs_node->lockf = NULL; /* advlock */
486 
487 	genfs_node_init(vp, &v7fs_genfsops);
488 	uvm_vnp_setsize(vp, v7fs_inode_filesize(&inode));
489 
490 	if (ino == V7FS_ROOT_INODE) {
491 		vp->v_type = VDIR;
492 		vp->v_vflag |= VV_ROOT;
493 	} else {
494 		vp->v_type = v7fs_mode_to_vtype(inode.mode);
495 
496 		if (vp->v_type == VBLK || vp->v_type == VCHR) {
497 			dev_t rdev = inode.device;
498 			vp->v_op = v7fs_specop_p;
499 			spec_node_init(vp, rdev);
500 		} else if (vp->v_type == VFIFO) {
501 			vp->v_op = v7fs_fifoop_p;
502 		}
503 	}
504 
505 	*vpp = vp;
506 
507 	return 0;
508 }
509 
510 
511 int
512 v7fs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp)
513 {
514 
515 	DPRINTF("\n");
516 	/* notyet */
517 	return EOPNOTSUPP;
518 }
519 
520 int
521 v7fs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size)
522 {
523 
524 	DPRINTF("\n");
525 	/* notyet */
526 	return EOPNOTSUPP;
527 }
528 
529 MALLOC_DECLARE(M_V7FS);
530 MALLOC_DECLARE(M_V7FS_VNODE);
531 
532 void
533 v7fs_init(void)
534 {
535 
536 	DPRINTF("\n");
537 	malloc_type_attach(M_V7FS_VFS);
538 	malloc_type_attach(M_V7FS);
539 	malloc_type_attach(M_V7FS_VNODE);
540 	pool_init(&v7fs_node_pool, sizeof(struct v7fs_node), 0, 0, 0,
541 	    "v7fs_node_pool", &pool_allocator_nointr, IPL_NONE);
542 }
543 
544 void
545 v7fs_reinit(void)
546 {
547 
548 	/* Nothing to do. */
549 	DPRINTF("\n");
550 }
551 
552 void
553 v7fs_done(void)
554 {
555 
556 	DPRINTF("\n");
557 	pool_destroy(&v7fs_node_pool);
558 	malloc_type_detach(M_V7FS);
559 	malloc_type_detach(M_V7FS_VFS);
560 	malloc_type_detach(M_V7FS_VNODE);
561 }
562 
563 int
564 v7fs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags,
565     kauth_cred_t cred)
566 {
567 
568 	DPRINTF("\n");
569 	return 0;
570 }
571 
572 int
573 v7fs_mountroot(void)
574 {
575 	struct mount *mp;
576 	int error;
577 
578 	DPRINTF("");
579 	/* On mountroot, devvp (rootdev) is opened by vfs_mountroot */
580 	if ((error = is_v7fs_partition (rootvp)))
581 		return error;
582 
583 	if ((error = vfs_rootmountalloc(MOUNT_V7FS, "root_device", &mp))) {
584 		DPRINTF("mountalloc error=%d\n", error);
585 		vrele(rootvp);
586 		return error;
587 	}
588 
589 	if ((error = v7fs_mountfs(rootvp, mp, _BYTE_ORDER))) {
590 		DPRINTF("mountfs error=%d\n", error);
591 		vfs_unbusy(mp, false, NULL);
592 		vfs_destroy(mp);
593 		return error;
594 	}
595 
596 	mutex_enter(&mountlist_lock);
597 	CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
598 	mutex_exit(&mountlist_lock);
599 
600 	vfs_unbusy(mp, false, NULL);
601 
602 	return 0;
603 }
604