1/*	$NetBSD: v7fs_vfsops.c,v 1.19 2022/05/03 07:34:38 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 1.19 2022/05/03 07:34:38 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
70struct pool v7fs_node_pool;
71
72static int v7fs_mountfs(struct vnode *, struct mount *, int);
73static int v7fs_openfs(struct vnode *, struct mount *, struct lwp *);
74static void v7fs_closefs(struct vnode *, struct mount *);
75static int is_v7fs_partition(struct vnode *);
76static enum vtype v7fs_mode_to_vtype(v7fs_mode_t mode);
77
78int
79v7fs_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
161		vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
162		error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
163		    KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp,
164		    KAUTH_ARG(accessmode));
165		VOP_UNLOCK(devvp);
166	}
167
168	if (error) {
169		vrele(devvp);
170		return error;
171	}
172
173	if (!update) {
174		if ((error = v7fs_openfs(devvp, mp, l))) {
175			vrele(devvp);
176			return error;
177		}
178
179		if ((error = v7fs_mountfs(devvp, mp, args->endian))) {
180			v7fs_closefs(devvp, mp);
181			VOP_UNLOCK(devvp);
182			vrele(devvp);
183			return error;
184		}
185		VOP_UNLOCK(devvp);
186	} else 	if (mp->mnt_flag & MNT_RDONLY) {
187		/* XXX: r/w -> read only */
188	}
189
190	return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE,
191	    mp->mnt_op->vfs_name, mp, l);
192}
193
194static int
195is_v7fs_partition(struct vnode *devvp)
196{
197	struct dkwedge_info dkw;
198	int error;
199
200	if ((error = getdiskinfo(devvp, &dkw)) != 0) {
201		DPRINTF("getdiskinfo=%d\n", error);
202		return error;
203	}
204	DPRINTF("ptype=%s size=%" PRIu64 "\n", dkw.dkw_ptype, dkw.dkw_size);
205
206	return strcmp(dkw.dkw_ptype, DKW_PTYPE_V7) == 0 ? 0 : EINVAL;
207}
208
209static int
210v7fs_openfs(struct vnode *devvp, struct mount *mp, struct lwp *l)
211{
212	kauth_cred_t cred = l->l_cred;
213	int oflags;
214	int error;
215
216	/* Flush buffer */
217	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
218	if ((error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0)))
219		goto unlock_exit;
220
221	/* Open block device */
222	oflags = FREAD;
223	if ((mp->mnt_flag & MNT_RDONLY) == 0)
224		oflags |= FWRITE;
225
226	if ((error = VOP_OPEN(devvp, oflags, NOCRED)) != 0) {
227		DPRINTF("VOP_OPEN=%d\n", error);
228		goto unlock_exit;
229	}
230
231	return 0; /* lock held */
232
233unlock_exit:
234	VOP_UNLOCK(devvp);
235
236	return error;
237}
238
239static void
240v7fs_closefs(struct vnode *devvp, struct mount *mp)
241{
242	int oflags = FREAD;
243
244	if ((mp->mnt_flag & MNT_RDONLY) == 0)
245		oflags |= FWRITE;
246
247	VOP_CLOSE(devvp, oflags, NOCRED);
248}
249
250static int
251v7fs_mountfs(struct vnode *devvp, struct mount *mp, int endian)
252{
253	struct v7fs_mount *v7fsmount;
254	int error;
255	struct v7fs_mount_device mount;
256
257	DPRINTF("%d\n",endian);
258
259	v7fsmount = kmem_zalloc(sizeof(*v7fsmount), KM_SLEEP);
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
287err_exit:
288	kmem_free(v7fsmount, sizeof(*v7fsmount));
289	return error;
290}
291
292int
293v7fs_start(struct mount *mp, int flags)
294{
295
296	DPRINTF("\n");
297	/* Nothing to do. */
298	return 0;
299}
300
301int
302v7fs_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
326int
327v7fs_root(struct mount *mp, int lktype, struct vnode **vpp)
328{
329	struct vnode *vp;
330	int error;
331
332	DPRINTF("\n");
333	if ((error = VFS_VGET(mp, V7FS_ROOT_INODE, lktype, &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
343int
344v7fs_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
369static bool
370v7fs_sync_selector(void *cl, struct vnode *vp)
371{
372	struct v7fs_node *v7fs_node;
373
374	KASSERT(mutex_owned(vp->v_interlock));
375
376	v7fs_node = vp->v_data;
377	if (v7fs_node == NULL)
378		return false;
379	if (!v7fs_inode_allocated(&v7fs_node->inode))
380		return false;
381
382	return true;
383}
384
385int
386v7fs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
387{
388	struct v7fs_mount *v7fsmount = mp->mnt_data;
389	struct v7fs_self *fs = v7fsmount->core;
390	struct vnode_iterator *marker;
391	struct vnode *vp;
392	int err, error;
393
394	DPRINTF("\n");
395
396	v7fs_superblock_writeback(fs);
397	error = 0;
398	vfs_vnode_iterator_init(mp, &marker);
399	while ((vp = vfs_vnode_iterator_next(marker,
400	    v7fs_sync_selector, NULL)) != NULL) {
401		err = vn_lock(vp, LK_EXCLUSIVE);
402		if (err) {
403			vrele(vp);
404			continue;
405		}
406		err = VOP_FSYNC(vp, cred, FSYNC_WAIT, 0, 0);
407		vput(vp);
408		if (err != 0)
409			error = err;
410	}
411	vfs_vnode_iterator_destroy(marker);
412
413	return error;
414}
415
416static enum vtype
417v7fs_mode_to_vtype (v7fs_mode_t mode)
418{
419	enum vtype table[] = { VCHR, VDIR, VBLK, VREG, VLNK, VSOCK };
420
421	if ((mode & V7FS_IFMT) == V7FSBSD_IFFIFO)
422		return VFIFO;
423
424	return table[((mode >> 13) & 7) - 1];
425}
426
427int
428v7fs_loadvnode(struct mount *mp, struct vnode *vp,
429    const void *key, size_t key_len, const void **new_key)
430{
431	struct v7fs_mount *v7fsmount;
432	struct v7fs_self *fs;
433	struct v7fs_node *v7fs_node;
434	struct v7fs_inode inode;
435	v7fs_ino_t number;
436	int error;
437
438	KASSERT(key_len == sizeof(number));
439	memcpy(&number, key, key_len);
440
441	v7fsmount = mp->mnt_data;
442	fs = v7fsmount->core;
443
444	/* Lookup requested i-node */
445	if ((error = v7fs_inode_load(fs, &inode, number))) {
446		DPRINTF("v7fs_inode_load failed.\n");
447		return error;
448	}
449
450	v7fs_node = pool_get(&v7fs_node_pool, PR_WAITOK);
451	memset(v7fs_node, 0, sizeof(*v7fs_node));
452
453	vp->v_tag = VT_V7FS;
454	vp->v_data = v7fs_node;
455	v7fs_node->vnode = vp;
456	v7fs_node->v7fsmount = v7fsmount;
457	v7fs_node->inode = inode;/*structure copy */
458	v7fs_node->lockf = NULL; /* advlock */
459
460	genfs_node_init(vp, &v7fs_genfsops);
461	uvm_vnp_setsize(vp, v7fs_inode_filesize(&inode));
462
463	if (number == V7FS_ROOT_INODE) {
464		vp->v_type = VDIR;
465		vp->v_vflag |= VV_ROOT;
466		vp->v_op = v7fs_vnodeop_p;
467	} else {
468		vp->v_type = v7fs_mode_to_vtype(inode.mode);
469
470		if (vp->v_type == VBLK || vp->v_type == VCHR) {
471			dev_t rdev = inode.device;
472			vp->v_op = v7fs_specop_p;
473			spec_node_init(vp, rdev);
474		} else if (vp->v_type == VFIFO) {
475			vp->v_op = v7fs_fifoop_p;
476		} else {
477			vp->v_op = v7fs_vnodeop_p;
478		}
479	}
480
481	*new_key = &v7fs_node->inode.inode_number;
482
483	return 0;
484}
485
486
487int
488v7fs_vget(struct mount *mp, ino_t ino, int lktype, struct vnode **vpp)
489{
490	int error;
491	v7fs_ino_t number;
492	struct vnode *vp;
493
494	KASSERT(ino <= UINT16_MAX);
495	number = ino;
496
497	error = vcache_get(mp, &number, sizeof(number), &vp);
498	if (error)
499		return error;
500	error = vn_lock(vp, lktype);
501	if (error) {
502		vrele(vp);
503		return error;
504	}
505
506	*vpp = vp;
507
508	return 0;
509}
510
511int
512v7fs_fhtovp(struct mount *mp, struct fid *fid, int lktype, struct vnode **vpp)
513{
514
515	DPRINTF("\n");
516	/* notyet */
517	return EOPNOTSUPP;
518}
519
520int
521v7fs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size)
522{
523
524	DPRINTF("\n");
525	/* notyet */
526	return EOPNOTSUPP;
527}
528
529void
530v7fs_init(void)
531{
532
533	DPRINTF("\n");
534	pool_init(&v7fs_node_pool, sizeof(struct v7fs_node), 0, 0, 0,
535	    "v7fs_node_pool", &pool_allocator_nointr, IPL_NONE);
536}
537
538void
539v7fs_reinit(void)
540{
541
542	/* Nothing to do. */
543	DPRINTF("\n");
544}
545
546void
547v7fs_done(void)
548{
549
550	DPRINTF("\n");
551	pool_destroy(&v7fs_node_pool);
552}
553
554int
555v7fs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags,
556    kauth_cred_t cred)
557{
558
559	DPRINTF("\n");
560	return 0;
561}
562
563int
564v7fs_mountroot(void)
565{
566	struct mount *mp;
567	int error;
568
569	DPRINTF("");
570	/* On mountroot, devvp (rootdev) is opened by vfs_mountroot */
571	if ((error = is_v7fs_partition (rootvp)))
572		return error;
573
574	if ((error = vfs_rootmountalloc(MOUNT_V7FS, "root_device", &mp))) {
575		DPRINTF("mountalloc error=%d\n", error);
576		vrele(rootvp);
577		return error;
578	}
579
580	if ((error = v7fs_mountfs(rootvp, mp, _BYTE_ORDER))) {
581		DPRINTF("mountfs error=%d\n", error);
582		vfs_unbusy(mp);
583		vfs_rele(mp);
584		return error;
585	}
586
587	mountlist_append(mp);
588
589	vfs_unbusy(mp);
590
591	return 0;
592}
593