xref: /netbsd-src/sys/fs/v7fs/v7fs_vfsops.c (revision b7b7574d3bf8eeb51a1fa3977b59142ec6434a55) 
1 /*	$NetBSD: v7fs_vfsops.c,v 1.10 2014/04/16 18:55:19 maxv 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 1.10 2014/04/16 18:55:19 maxv 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 int v7fs_vnode_reload(struct mount *, struct vnode *);
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 = 0;
87 	bool update = mp->mnt_flag & MNT_UPDATE;
88 
89 	DPRINTF("mnt_flag=%x %s\n", mp->mnt_flag, update ? "update" : "");
90 
91 	if (args == NULL)
92 		return EINVAL;
93 	if (*data_len < sizeof(*args))
94 		return EINVAL;
95 
96 	if (mp->mnt_flag & MNT_GETARGS) {
97 		if (!v7fsmount)
98 			return EIO;
99 		args->fspec = NULL;
100 		args->endian = v7fsmount->core->endian;
101 		*data_len = sizeof(*args);
102 		return 0;
103 	}
104 
105 	DPRINTF("args->fspec=%s endian=%d\n", args->fspec, args->endian);
106 	if (args->fspec == NULL) {
107 		/* nothing to do. */
108 		return EINVAL;
109 	}
110 
111 	if (args->fspec != NULL) {
112 		/* Look up the name and verify that it's sane. */
113 		error = namei_simple_user(args->fspec,
114 		    NSM_FOLLOW_NOEMULROOT, &devvp);
115 		if (error != 0)
116 			return (error);
117 		DPRINTF("mount device=%lx\n", (long)devvp->v_rdev);
118 
119 		if (!update) {
120 			/*
121 			 * Be sure this is a valid block device
122 			 */
123 			if (devvp->v_type != VBLK)
124 				error = ENOTBLK;
125 			else if (bdevsw_lookup(devvp->v_rdev) == NULL)
126 				error = ENXIO;
127 		} else {
128 			KDASSERT(v7fsmount);
129 			/*
130 			 * Be sure we're still naming the same device
131 			 * used for our initial mount
132 			 */
133 			if (devvp != v7fsmount->devvp) {
134 				DPRINTF("devvp %p != %p rootvp=%p\n", devvp,
135 				    v7fsmount->devvp, rootvp);
136 				if (rootvp == v7fsmount->devvp) {
137 					vrele(devvp);
138 					devvp = rootvp;
139 					vref(devvp);
140 				} else {
141 					error = EINVAL;
142 				}
143 			}
144 		}
145 	}
146 
147 	/*
148 	 * If mount by non-root, then verify that user has necessary
149 	 * permissions on the device.
150 	 *
151 	 * Permission to update a mount is checked higher, so here we presume
152 	 * updating the mount is okay (for example, as far as securelevel goes)
153 	 * which leaves us with the normal check.
154 	 */
155 	if (error == 0) {
156 		int accessmode = VREAD;
157 		if (update ?
158 		    (mp->mnt_iflag & IMNT_WANTRDWR) != 0 :
159 		    (mp->mnt_flag & MNT_RDONLY) == 0)
160 			accessmode |= VWRITE;
161 		error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
162 		    KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp,
163 		    KAUTH_ARG(accessmode));
164 	}
165 
166 	if (error) {
167 		vrele(devvp);
168 		return error;
169 	}
170 
171 	if (!update) {
172 		if ((error = v7fs_openfs(devvp, mp, l))) {
173 			vrele(devvp);
174 			return error;
175 		}
176 
177 		if ((error = v7fs_mountfs(devvp, mp, args->endian))) {
178 			v7fs_closefs(devvp, mp);
179 			VOP_UNLOCK(devvp);
180 			vrele(devvp);
181 			return error;
182 		}
183 		VOP_UNLOCK(devvp);
184 	} else 	if (mp->mnt_flag & MNT_RDONLY) {
185 		/* XXX: r/w -> read only */
186 	}
187 
188 	return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE,
189 	    mp->mnt_op->vfs_name, mp, l);
190 }
191 
192 static int
193 is_v7fs_partition(struct vnode *devvp)
194 {
195 	struct dkwedge_info dkw;
196 	int error;
197 
198 	if ((error = getdiskinfo(devvp, &dkw)) != 0) {
199 		DPRINTF("getdiskinfo=%d\n", error);
200 		return error;
201 	}
202 	DPRINTF("ptype=%s size=%" PRIu64 "\n", dkw.dkw_ptype, dkw->dkw_size);
203 
204 	return strcmp(dkw.dkw_ptype, DKW_PTYPE_V7) == 0 ? 0 : EINVAL;
205 }
206 
207 static int
208 v7fs_openfs(struct vnode *devvp, struct mount *mp, struct lwp *l)
209 {
210 	kauth_cred_t cred = l->l_cred;
211 	int oflags;
212 	int error;
213 
214 	/* Flush buffer */
215 	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
216 	if ((error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0)))
217 		goto unlock_exit;
218 
219 	/* Open block device */
220 	oflags = FREAD;
221 	if ((mp->mnt_flag & MNT_RDONLY) == 0)
222 		oflags |= FWRITE;
223 
224 	if ((error = VOP_OPEN(devvp, oflags, NOCRED)) != 0) {
225 		DPRINTF("VOP_OPEN=%d\n", error);
226 		goto unlock_exit;
227 	}
228 
229 	return 0; /* lock held */
230 
231 unlock_exit:
232 	VOP_UNLOCK(devvp);
233 
234 	return error;
235 }
236 
237 static void
238 v7fs_closefs(struct vnode *devvp, struct mount *mp)
239 {
240 	int oflags = FREAD;
241 
242 	if ((mp->mnt_flag & MNT_RDONLY) == 0)
243 		oflags |= FWRITE;
244 
245 	VOP_CLOSE(devvp, oflags, NOCRED);
246 }
247 
248 static int
249 v7fs_mountfs(struct vnode *devvp, struct mount *mp, int endian)
250 {
251 	struct v7fs_mount *v7fsmount;
252 	int error;
253 	struct v7fs_mount_device mount;
254 
255 	DPRINTF("%d\n",endian);
256 
257 	v7fsmount = kmem_zalloc(sizeof(*v7fsmount), KM_SLEEP);
258 	if (v7fsmount == NULL) {
259 		return ENOMEM;
260 	}
261 	v7fsmount->devvp = devvp;
262 	v7fsmount->mountp = mp;
263 
264 	mount.device.vnode = devvp;
265 	mount.endian = endian;
266 
267 	if ((error = v7fs_io_init(&v7fsmount->core, &mount, V7FS_BSIZE))) {
268 		goto err_exit;
269 	}
270 	struct v7fs_self *fs = v7fsmount->core;
271 
272 	if ((error = v7fs_superblock_load(fs))) {
273 		v7fs_io_fini(fs);
274 		goto err_exit;
275 	}
276 
277 	LIST_INIT(&v7fsmount->v7fs_node_head);
278 
279 	mp->mnt_data = v7fsmount;
280 	mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)devvp->v_rdev;
281 	mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_V7FS);
282 	mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
283 	mp->mnt_stat.f_namemax = V7FS_NAME_MAX;
284 	mp->mnt_flag |= MNT_LOCAL;
285 	mp->mnt_dev_bshift = V7FS_BSHIFT;
286 	mp->mnt_fs_bshift = V7FS_BSHIFT;
287 
288 	return 0;
289 
290 err_exit:
291 	kmem_free(v7fsmount, sizeof(*v7fsmount));
292 	return error;
293 }
294 
295 int
296 v7fs_start(struct mount *mp, int flags)
297 {
298 
299 	DPRINTF("\n");
300 	/* Nothing to do. */
301 	return 0;
302 }
303 
304 int
305 v7fs_unmount(struct mount *mp, int mntflags)
306 {
307 	struct v7fs_mount *v7fsmount = (void *)mp->mnt_data;
308 	int error;
309 
310 	DPRINTF("%p\n", v7fsmount);
311 
312 	if ((error = vflush(mp, NULLVP,
313 		    mntflags & MNT_FORCE ? FORCECLOSE : 0)) != 0)
314 		return error;
315 
316 	vn_lock(v7fsmount->devvp, LK_EXCLUSIVE | LK_RETRY);
317 	error = VOP_CLOSE(v7fsmount->devvp, FREAD, NOCRED);
318 	vput(v7fsmount->devvp);
319 
320 	v7fs_io_fini(v7fsmount->core);
321 
322 	kmem_free(v7fsmount, sizeof(*v7fsmount));
323 	mp->mnt_data = NULL;
324 	mp->mnt_flag &= ~MNT_LOCAL;
325 
326 	return 0;
327 }
328 
329 int
330 v7fs_root(struct mount *mp, struct vnode **vpp)
331 {
332 	struct vnode *vp;
333 	int error;
334 
335 	DPRINTF("\n");
336 	if ((error = VFS_VGET(mp, V7FS_ROOT_INODE, &vp)) != 0) {
337 		DPRINTF("error=%d\n", error);
338 		return error;
339 	}
340 	*vpp = vp;
341 	DPRINTF("done.\n");
342 
343 	return 0;
344 }
345 
346 int
347 v7fs_statvfs(struct mount *mp, struct statvfs *f)
348 {
349 	struct v7fs_mount *v7fsmount = mp->mnt_data;
350 	struct v7fs_self *fs = v7fsmount->core;
351 
352 	DPRINTF("scratch remain=%d\n", fs->scratch_remain);
353 
354 	v7fs_superblock_status(fs);
355 
356 	f->f_bsize = V7FS_BSIZE;
357 	f->f_frsize = V7FS_BSIZE;
358 	f->f_iosize = V7FS_BSIZE;
359 	f->f_blocks = fs->stat.total_blocks;
360 	f->f_bfree = fs->stat.free_blocks;
361 	f->f_bavail = fs->stat.free_blocks;
362 	f->f_bresvd = 0;
363 	f->f_files = fs->stat.total_files;
364 	f->f_ffree = fs->stat.free_inode;
365 	f->f_favail = f->f_ffree;
366 	f->f_fresvd = 0;
367 	copy_statvfs_info(f, mp);
368 
369 	return 0;
370 }
371 
372 int
373 v7fs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
374 {
375 	struct v7fs_mount *v7fsmount = mp->mnt_data;
376 	struct v7fs_self *fs = v7fsmount->core;
377 	struct v7fs_node *v7fs_node;
378 	struct v7fs_inode *inode;
379 	struct vnode *v;
380 	int err, error;
381 	int retry_cnt;
382 
383 	DPRINTF("\n");
384 
385 	v7fs_superblock_writeback(fs);
386 	for (retry_cnt = 0; retry_cnt < 2; retry_cnt++) {
387 		error = 0;
388 
389 		mutex_enter(&mntvnode_lock);
390 		for (v7fs_node = LIST_FIRST(&v7fsmount->v7fs_node_head);
391 		    v7fs_node != NULL; v7fs_node = LIST_NEXT(v7fs_node, link)) {
392 			inode = &v7fs_node->inode;
393 			if (!v7fs_inode_allocated(inode)) {
394 				continue;
395 			}
396 			v = v7fs_node->vnode;
397 			mutex_enter(v->v_interlock);
398 			mutex_exit(&mntvnode_lock);
399 			err = vget(v, LK_EXCLUSIVE | LK_NOWAIT);
400 			if (err == 0) {
401 				err = VOP_FSYNC(v, cred, FSYNC_WAIT, 0, 0);
402 				vput(v);
403 			}
404 			if (err != 0)
405 				error = err;
406 			mutex_enter(&mntvnode_lock);
407 		}
408 		mutex_exit(&mntvnode_lock);
409 
410 		if (error == 0)
411 			break;
412 	}
413 
414 	return error;
415 }
416 
417 static enum vtype
418 v7fs_mode_to_vtype (v7fs_mode_t mode)
419 {
420 	enum vtype table[] = { VCHR, VDIR, VBLK, VREG, VLNK, VSOCK };
421 
422 	if ((mode & V7FS_IFMT) == V7FSBSD_IFFIFO)
423 		return VFIFO;
424 
425 	return table[((mode >> 13) & 7) - 1];
426 }
427 
428 int
429 v7fs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
430 {
431 	struct v7fs_mount *v7fsmount = mp->mnt_data;
432 	struct v7fs_self *fs = v7fsmount->core;
433 	struct vnode *vp;
434 	struct v7fs_node *v7fs_node;
435 	struct v7fs_inode inode;
436 	int error;
437 
438 	/* Lookup requested i-node */
439 	if ((error = v7fs_inode_load(fs, &inode, ino))) {
440 		DPRINTF("v7fs_inode_load failed.\n");
441 		return error;
442 	}
443 
444 retry:
445 	mutex_enter(&mntvnode_lock);
446 	for (v7fs_node = LIST_FIRST(&v7fsmount->v7fs_node_head);
447 	    v7fs_node != NULL; v7fs_node = LIST_NEXT(v7fs_node, link)) {
448 		if (v7fs_node->inode.inode_number == ino) {
449 			vp = v7fs_node->vnode;
450 			mutex_enter(vp->v_interlock);
451 			mutex_exit(&mntvnode_lock);
452 			if (vget(vp, LK_EXCLUSIVE) == 0) {
453 				*vpp = vp;
454 				return 0;
455 			} else {
456 				DPRINTF("retry!\n");
457 				goto retry;
458 			}
459 		}
460 	}
461 	mutex_exit(&mntvnode_lock);
462 
463 	/* Allocate v-node. */
464 	if ((error = getnewvnode(VT_V7FS, mp, v7fs_vnodeop_p, NULL, &vp))) {
465 		DPRINTF("getnewvnode error.\n");
466 		return error;
467 	}
468 	/* Lock vnode here */
469 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
470 
471 	/* Allocate i-node */
472 	vp->v_data = pool_get(&v7fs_node_pool, PR_WAITOK);
473 	memset(vp->v_data, 0, sizeof(*v7fs_node));
474 	v7fs_node = vp->v_data;
475 	mutex_enter(&mntvnode_lock);
476 	LIST_INSERT_HEAD(&v7fsmount->v7fs_node_head, v7fs_node, link);
477 	mutex_exit(&mntvnode_lock);
478 	v7fs_node->vnode = vp;
479 	v7fs_node->v7fsmount = v7fsmount;
480 	v7fs_node->inode = inode;/*structure copy */
481 	v7fs_node->lockf = NULL; /* advlock */
482 
483 	genfs_node_init(vp, &v7fs_genfsops);
484 	uvm_vnp_setsize(vp, v7fs_inode_filesize(&inode));
485 
486 	if (ino == V7FS_ROOT_INODE) {
487 		vp->v_type = VDIR;
488 		vp->v_vflag |= VV_ROOT;
489 	} else {
490 		vp->v_type = v7fs_mode_to_vtype(inode.mode);
491 
492 		if (vp->v_type == VBLK || vp->v_type == VCHR) {
493 			dev_t rdev = inode.device;
494 			vp->v_op = v7fs_specop_p;
495 			spec_node_init(vp, rdev);
496 		} else if (vp->v_type == VFIFO) {
497 			vp->v_op = v7fs_fifoop_p;
498 		}
499 	}
500 
501 	*vpp = vp;
502 
503 	return 0;
504 }
505 
506 
507 int
508 v7fs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp)
509 {
510 
511 	DPRINTF("\n");
512 	/* notyet */
513 	return EOPNOTSUPP;
514 }
515 
516 int
517 v7fs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size)
518 {
519 
520 	DPRINTF("\n");
521 	/* notyet */
522 	return EOPNOTSUPP;
523 }
524 
525 void
526 v7fs_init(void)
527 {
528 
529 	DPRINTF("\n");
530 	pool_init(&v7fs_node_pool, sizeof(struct v7fs_node), 0, 0, 0,
531 	    "v7fs_node_pool", &pool_allocator_nointr, IPL_NONE);
532 }
533 
534 void
535 v7fs_reinit(void)
536 {
537 
538 	/* Nothing to do. */
539 	DPRINTF("\n");
540 }
541 
542 void
543 v7fs_done(void)
544 {
545 
546 	DPRINTF("\n");
547 	pool_destroy(&v7fs_node_pool);
548 }
549 
550 int
551 v7fs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags,
552     kauth_cred_t cred)
553 {
554 
555 	DPRINTF("\n");
556 	return 0;
557 }
558 
559 int
560 v7fs_mountroot(void)
561 {
562 	struct mount *mp;
563 	int error;
564 
565 	DPRINTF("");
566 	/* On mountroot, devvp (rootdev) is opened by vfs_mountroot */
567 	if ((error = is_v7fs_partition (rootvp)))
568 		return error;
569 
570 	if ((error = vfs_rootmountalloc(MOUNT_V7FS, "root_device", &mp))) {
571 		DPRINTF("mountalloc error=%d\n", error);
572 		vrele(rootvp);
573 		return error;
574 	}
575 
576 	if ((error = v7fs_mountfs(rootvp, mp, _BYTE_ORDER))) {
577 		DPRINTF("mountfs error=%d\n", error);
578 		vfs_unbusy(mp, false, NULL);
579 		vfs_destroy(mp);
580 		return error;
581 	}
582 
583 	mountlist_append(mp);
584 
585 	vfs_unbusy(mp, false, NULL);
586 
587 	return 0;
588 }
589 
590 /* Reload disk inode information */
591 int
592 v7fs_vnode_reload(struct mount *mp, struct vnode *vp)
593 {
594 	struct v7fs_mount *v7fsmount = mp->mnt_data;
595 	struct v7fs_self *fs = v7fsmount->core;
596 	struct v7fs_node *v7fs_node;
597 	struct v7fs_inode *inode = &((struct v7fs_node *)vp->v_data)->inode;
598 	int target_ino = inode->inode_number;
599 	int error = 0;
600 
601 	DPRINTF("#%d\n", target_ino);
602 	mutex_enter(&mntvnode_lock);
603 	for (v7fs_node = LIST_FIRST(&v7fsmount->v7fs_node_head);
604 	     v7fs_node != NULL; v7fs_node = LIST_NEXT(v7fs_node, link)) {
605 		inode = &v7fs_node->inode;
606 		if (!v7fs_inode_allocated(inode)) {
607 			continue;
608 		}
609 		if (inode->inode_number == target_ino) {
610 			error = v7fs_inode_load(fs, &v7fs_node->inode,
611 			    target_ino);
612 			DPRINTF("sync #%d error=%d\n", target_ino, error);
613 			break;
614 		}
615 	}
616 	mutex_exit(&mntvnode_lock);
617 
618 	return error;
619 }
620