xref: /netbsd-src/sys/fs/filecorefs/filecore_vnops.c (revision aaf4ece63a859a04e37cf3a7229b5fab0157cc06)
1 /*	$NetBSD: filecore_vnops.c,v 1.16 2005/12/11 12:24:25 christos Exp $	*/
2 
3 /*-
4  * Copyright (c) 1994 The Regents of the University of California.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  *	filecore_vnops.c	1.2	1998/8/18
32  */
33 
34 /*-
35  * Copyright (c) 1998 Andrew McMurry
36  *
37  * Redistribution and use in source and binary forms, with or without
38  * modification, are permitted provided that the following conditions
39  * are met:
40  * 1. Redistributions of source code must retain the above copyright
41  *    notice, this list of conditions and the following disclaimer.
42  * 2. Redistributions in binary form must reproduce the above copyright
43  *    notice, this list of conditions and the following disclaimer in the
44  *    documentation and/or other materials provided with the distribution.
45  * 3. All advertising materials mentioning features or use of this software
46  *    must display the following acknowledgement:
47  *	This product includes software developed by the University of
48  *	California, Berkeley and its contributors.
49  * 4. Neither the name of the University nor the names of its contributors
50  *    may be used to endorse or promote products derived from this software
51  *    without specific prior written permission.
52  *
53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63  * SUCH DAMAGE.
64  *
65  *	filecore_vnops.c	1.2	1998/8/18
66  */
67 
68 #include <sys/cdefs.h>
69 __KERNEL_RCSID(0, "$NetBSD: filecore_vnops.c,v 1.16 2005/12/11 12:24:25 christos Exp $");
70 
71 #include <sys/param.h>
72 #include <sys/systm.h>
73 #include <sys/namei.h>
74 #include <sys/resourcevar.h>
75 #include <sys/kernel.h>
76 #include <sys/file.h>
77 #include <sys/stat.h>
78 #include <sys/buf.h>
79 #include <sys/proc.h>
80 #include <sys/conf.h>
81 #include <sys/mount.h>
82 #include <sys/vnode.h>
83 #include <sys/malloc.h>
84 #include <sys/dirent.h>
85 
86 #include <miscfs/genfs/genfs.h>
87 #include <miscfs/specfs/specdev.h>
88 
89 #include <fs/filecorefs/filecore.h>
90 #include <fs/filecorefs/filecore_extern.h>
91 #include <fs/filecorefs/filecore_node.h>
92 
93 /*
94  * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC.
95  * The mode is shifted to select the owner/group/other fields. The
96  * super user is granted all permissions.
97  */
98 int
99 filecore_access(v)
100 	void *v;
101 {
102 	struct vop_access_args /* {
103 		struct vnode *a_vp;
104 		int  a_mode;
105 		struct ucred *a_cred;
106 		struct lwp *a_l;
107 	} */ *ap = v;
108 	struct vnode *vp = ap->a_vp;
109 	struct filecore_node *ip = VTOI(vp);
110 	struct filecore_mnt *fcmp = ip->i_mnt;
111 
112 	/*
113 	 * Disallow write attempts unless the file is a socket,
114 	 * fifo, or a block or character device resident on the
115 	 * file system.
116 	 */
117 	if (ap->a_mode & VWRITE) {
118 		switch (vp->v_type) {
119 		case VDIR:
120 		case VLNK:
121 		case VREG:
122 			return (EROFS);
123 		default:
124 			break;
125 		}
126 	}
127 
128 	return (vaccess(vp->v_type, filecore_mode(ip),
129 	    fcmp->fc_uid, fcmp->fc_gid, ap->a_mode, ap->a_cred));
130 }
131 
132 int
133 filecore_getattr(v)
134 	void *v;
135 {
136 	struct vop_getattr_args /* {
137 		struct vnode *a_vp;
138 		struct vattr *a_vap;
139 		struct ucred *a_cred;
140 		struct lwp *a_l;
141 	} */ *ap = v;
142 	struct vnode *vp = ap->a_vp;
143 	struct filecore_node *ip = VTOI(vp);
144 	struct vattr *vap = ap->a_vap;
145 	struct filecore_mnt *fcmp = ip->i_mnt;
146 
147 	vap->va_fsid	= ip->i_dev;
148 	vap->va_fileid	= ip->i_number;
149 
150 	vap->va_mode	= filecore_mode(ip);
151 	vap->va_nlink	= 1;
152 	vap->va_uid	= fcmp->fc_uid;
153 	vap->va_gid	= fcmp->fc_gid;
154 	vap->va_atime	= filecore_time(ip);
155 	vap->va_mtime	= filecore_time(ip);
156 	vap->va_ctime	= filecore_time(ip);
157 	vap->va_rdev	= 0;  /* We don't support specials */
158 
159 	vap->va_size	= (u_quad_t) ip->i_size;
160 	vap->va_flags	= 0;
161 	vap->va_gen	= 1;
162 	vap->va_blocksize = fcmp->blksize;
163 	vap->va_bytes	= vap->va_size;
164 	vap->va_type	= vp->v_type;
165 	return (0);
166 }
167 
168 /*
169  * Vnode op for reading.
170  */
171 int
172 filecore_read(v)
173 	void *v;
174 {
175 	struct vop_read_args /* {
176 		struct vnode *a_vp;
177 		struct uio *a_uio;
178 		int a_ioflag;
179 		struct ucred *a_cred;
180 	} */ *ap = v;
181 	struct vnode *vp = ap->a_vp;
182 	struct uio *uio = ap->a_uio;
183 	struct filecore_node *ip = VTOI(vp);
184 	struct filecore_mnt *fcmp;
185 	struct buf *bp;
186 	daddr_t lbn, rablock;
187 	off_t diff;
188 	int error = 0;
189 	long size, n, on;
190 
191 	if (uio->uio_resid == 0)
192 		return (0);
193 	if (uio->uio_offset < 0)
194 		return (EINVAL);
195 	if (uio->uio_offset >= ip->i_size)
196 		return (0);
197 	ip->i_flag |= IN_ACCESS;
198 	fcmp = ip->i_mnt;
199 
200 	if (vp->v_type == VREG) {
201 		const int advice = IO_ADV_DECODE(ap->a_ioflag);
202 		error = 0;
203 
204 		while (uio->uio_resid > 0) {
205 			void *win;
206 			int flags;
207 			vsize_t bytelen = MIN(ip->i_size - uio->uio_offset,
208 					      uio->uio_resid);
209 
210 			if (bytelen == 0) {
211 				break;
212 			}
213 			win = ubc_alloc(&vp->v_uobj, uio->uio_offset,
214 					&bytelen, advice, UBC_READ);
215 			error = uiomove(win, bytelen, uio);
216 			flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0;
217 			ubc_release(win, flags);
218 			if (error) {
219 				break;
220 			}
221 		}
222 		goto out;
223 	}
224 
225 	do {
226 		lbn = lblkno(fcmp, uio->uio_offset);
227 		on = blkoff(fcmp, uio->uio_offset);
228 		n = MIN(blksize(fcmp, ip, lbn) - on, uio->uio_resid);
229 		diff = (off_t)ip->i_size - uio->uio_offset;
230 		if (diff <= 0)
231 			return (0);
232 		if (diff < n)
233 			n = diff;
234 		size = blksize(fcmp, ip, lbn);
235 		rablock = lbn + 1;
236 		if (ip->i_dirent.attr & FILECORE_ATTR_DIR) {
237 			error = filecore_dbread(ip, &bp);
238 			on = uio->uio_offset;
239 			n = MIN(FILECORE_DIR_SIZE - on, uio->uio_resid);
240 			size = FILECORE_DIR_SIZE;
241 		} else {
242 			error = bread(vp, lbn, size, NOCRED, &bp);
243 #ifdef FILECORE_DEBUG_BR
244 			printf("bread(%p, %x, %ld, CRED, %p)=%d\n",
245 			    vp, lbn, size, bp, error);
246 #endif
247 		}
248 		n = MIN(n, size - bp->b_resid);
249 		if (error) {
250 #ifdef FILECORE_DEBUG_BR
251 			printf("brelse(%p) vn1\n", bp);
252 #endif
253 			brelse(bp);
254 			return (error);
255 		}
256 
257 		error = uiomove(bp->b_data + on, (int)n, uio);
258 #ifdef FILECORE_DEBUG_BR
259 		printf("brelse(%p) vn2\n", bp);
260 #endif
261 		brelse(bp);
262 	} while (error == 0 && uio->uio_resid > 0 && n != 0);
263 
264 out:
265 	return (error);
266 }
267 
268 /*
269  * Vnode op for readdir
270  */
271 int
272 filecore_readdir(v)
273 	void *v;
274 {
275 	struct vop_readdir_args /* {
276 		struct vnode *a_vp;
277 		struct uio *a_uio;
278 		struct ucred *a_cred;
279 		int *a_eofflag;
280 		off_t **a_cookies;
281 		int *a_ncookies;
282 	} */ *ap = v;
283 	struct uio *uio = ap->a_uio;
284 	struct vnode *vdp = ap->a_vp;
285 	struct filecore_node *dp;
286 	struct filecore_mnt *fcmp;
287 	struct buf *bp = NULL;
288 	struct dirent de;
289 	struct filecore_direntry *dep = NULL;
290 	int error = 0;
291 	off_t *cookies = NULL;
292 	int ncookies = 0;
293 	int i;
294 	off_t uiooff;
295 
296 	dp = VTOI(vdp);
297 
298 	if ((dp->i_dirent.attr & FILECORE_ATTR_DIR) == 0)
299 		return (ENOTDIR);
300 
301 	if (uio->uio_offset % FILECORE_DIRENT_SIZE != 0)
302 		return (EINVAL);
303 	i = uio->uio_offset / FILECORE_DIRENT_SIZE;
304 	uiooff = uio->uio_offset;
305 
306 	*ap->a_eofflag = 0;
307 	fcmp = dp->i_mnt;
308 
309 	error = filecore_dbread(dp, &bp);
310 	if (error) {
311 		brelse(bp);
312 		return error;
313 	}
314 
315 	if (ap->a_ncookies == NULL)
316 		cookies = NULL;
317 	else {
318 		*ap->a_ncookies = 0;
319 		ncookies = uio->uio_resid/16;
320 		cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
321 	}
322 
323 	for (; ; i++) {
324 		switch (i) {
325 		case 0:
326 			/* Fake the '.' entry */
327 			de.d_fileno = dp->i_number;
328 			de.d_type = DT_DIR;
329 			de.d_namlen = 1;
330 			strlcpy(de.d_name, ".", sizeof(de.d_name));
331 			break;
332 		case 1:
333 			/* Fake the '..' entry */
334 			de.d_fileno = filecore_getparent(dp);
335 			de.d_type = DT_DIR;
336 			de.d_namlen = 2;
337 			strlcpy(de.d_name, "..", sizeof(de.d_name));
338 			break;
339 		default:
340 			de.d_fileno = dp->i_dirent.addr +
341 					((i - 2) << FILECORE_INO_INDEX);
342 			dep = fcdirentry(bp->b_data, i - 2);
343 			if (dep->attr & FILECORE_ATTR_DIR)
344 				de.d_type = DT_DIR;
345 			else
346 				de.d_type = DT_REG;
347 			if (filecore_fn2unix(dep->name, de.d_name,
348 /*###346 [cc] warning: passing arg 3 of `filecore_fn2unix' from incompatible pointer type%%%*/
349 			    &de.d_namlen)) {
350 				*ap->a_eofflag = 1;
351 				goto out;
352 			}
353 			break;
354 		}
355 		de.d_reclen = _DIRENT_SIZE(&de);
356 		if (uio->uio_resid < de.d_reclen)
357 			goto out;
358 		error = uiomove(&de, de.d_reclen, uio);
359 		if (error)
360 			goto out;
361 		uiooff += FILECORE_DIRENT_SIZE;
362 
363 		if (cookies) {
364 			*cookies++ = i*FILECORE_DIRENT_SIZE;
365 			(*ap->a_ncookies)++;
366 			if (--ncookies == 0) goto out;
367 		}
368 	}
369 out:
370 	if (cookies) {
371 		*ap->a_cookies = cookies;
372 		if (error) {
373 			free(cookies, M_TEMP);
374 			*ap->a_ncookies = 0;
375 			*ap->a_cookies = NULL;
376 		}
377 	}
378 	uio->uio_offset = uiooff;
379 
380 #ifdef FILECORE_DEBUG_BR
381 	printf("brelse(%p) vn3\n", bp);
382 #endif
383 	brelse (bp);
384 
385 	return (error);
386 }
387 
388 /*
389  * Return target name of a symbolic link
390  * Shouldn't we get the parent vnode and read the data from there?
391  * This could eventually result in deadlocks in filecore_lookup.
392  * But otherwise the block read here is in the block buffer two times.
393  */
394 int
395 filecore_readlink(v)
396 	void *v;
397 {
398 #if 0
399 	struct vop_readlink_args /* {
400 		struct vnode *a_vp;
401 		struct uio *a_uio;
402 		struct ucred *a_cred;
403 	} */ *ap = v;
404 #endif
405 
406 	return (EINVAL);
407 }
408 
409 int
410 filecore_link(v)
411 	void *v;
412 {
413 	struct vop_link_args /* {
414 		struct vnode *a_dvp;
415 		struct vnode *a_vp;
416 		struct componentname *a_cnp;
417 	} */ *ap = v;
418 
419 	VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
420 	vput(ap->a_dvp);
421 	return (EROFS);
422 }
423 
424 int
425 filecore_symlink(v)
426 	void *v;
427 {
428 	struct vop_symlink_args /* {
429 		struct vnode *a_dvp;
430 		struct vnode **a_vpp;
431 		struct componentname *a_cnp;
432 		struct vattr *a_vap;
433 		char *a_target;
434 	} */ *ap = v;
435 
436 	VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
437 	vput(ap->a_dvp);
438 	return (EROFS);
439 }
440 
441 /*
442  * Calculate the logical to physical mapping if not done already,
443  * then call the device strategy routine.
444  */
445 int
446 filecore_strategy(v)
447 	void *v;
448 {
449 	struct vop_strategy_args /* {
450 		struct vnode *a_vp;
451 		struct buf *a_bp;
452 	} */ *ap = v;
453 	struct buf *bp = ap->a_bp;
454 	struct vnode *vp = ap->a_vp;
455 	struct filecore_node *ip;
456 	int error;
457 
458 	ip = VTOI(vp);
459 	if (bp->b_blkno == bp->b_lblkno) {
460 		error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL);
461 		if (error) {
462 			bp->b_error = error;
463 			bp->b_flags |= B_ERROR;
464 			biodone(bp);
465 			return (error);
466 		}
467 		if ((long)bp->b_blkno == -1)
468 			clrbuf(bp);
469 	}
470 	if ((long)bp->b_blkno == -1) {
471 		biodone(bp);
472 		return (0);
473 	}
474 	vp = ip->i_devvp;
475 	return (VOP_STRATEGY(vp, bp));
476 }
477 
478 /*
479  * Print out the contents of an inode.
480  */
481 /*ARGSUSED*/
482 int
483 filecore_print(v)
484 	void *v;
485 {
486 
487 	printf("tag VT_FILECORE, filecore vnode\n");
488 	return (0);
489 }
490 
491 /*
492  * Return POSIX pathconf information applicable to filecore filesystems.
493  */
494 int
495 filecore_pathconf(v)
496 	void *v;
497 {
498 	struct vop_pathconf_args /* {
499 		struct vnode *a_vp;
500 		int a_name;
501 		register_t *a_retval;
502 	} */ *ap = v;
503 	switch (ap->a_name) {
504 	case _PC_LINK_MAX:
505 		*ap->a_retval = 1;
506 		return (0);
507 	case _PC_NAME_MAX:
508 		*ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax;
509 		return (0);
510 	case _PC_PATH_MAX:
511 		*ap->a_retval = 256;
512 		return (0);
513 	case _PC_CHOWN_RESTRICTED:
514 		*ap->a_retval = 1;
515 		return (0);
516 	case _PC_NO_TRUNC:
517 		*ap->a_retval = 1;
518 		return (0);
519 	case _PC_SYNC_IO:
520 		*ap->a_retval = 1;
521 		return (0);
522 	case _PC_FILESIZEBITS:
523 		*ap->a_retval = 32;
524 		return (0);
525 	default:
526 		return (EINVAL);
527 	}
528 	/* NOTREACHED */
529 }
530 
531 /*
532  * Global vfs data structures for isofs
533  */
534 #define	filecore_create	genfs_eopnotsupp
535 #define	filecore_mknod	genfs_eopnotsupp
536 #define	filecore_write	genfs_eopnotsupp
537 #define	filecore_setattr	genfs_eopnotsupp
538 #define	filecore_lease_check	genfs_lease_check
539 #define	filecore_fcntl	genfs_fcntl
540 #define	filecore_ioctl	genfs_enoioctl
541 #define	filecore_fsync	genfs_nullop
542 #define	filecore_remove	genfs_eopnotsupp
543 #define	filecore_rename	genfs_eopnotsupp
544 #define	filecore_mkdir	genfs_eopnotsupp
545 #define	filecore_rmdir	genfs_eopnotsupp
546 #define	filecore_advlock	genfs_eopnotsupp
547 #define	filecore_bwrite	genfs_eopnotsupp
548 #define filecore_revoke	genfs_revoke
549 
550 /*
551  * Global vfs data structures for filecore
552  */
553 int (**filecore_vnodeop_p) __P((void *));
554 const struct vnodeopv_entry_desc filecore_vnodeop_entries[] = {
555 	{ &vop_default_desc, vn_default_error },
556 	{ &vop_lookup_desc, filecore_lookup },		/* lookup */
557 	{ &vop_create_desc, filecore_create },		/* create */
558 	{ &vop_mknod_desc, filecore_mknod },		/* mknod */
559 	{ &vop_open_desc, filecore_open },		/* open */
560 	{ &vop_close_desc, filecore_close },		/* close */
561 	{ &vop_access_desc, filecore_access },		/* access */
562 	{ &vop_getattr_desc, filecore_getattr },	/* getattr */
563 	{ &vop_setattr_desc, filecore_setattr },	/* setattr */
564 	{ &vop_read_desc, filecore_read },		/* read */
565 	{ &vop_write_desc, filecore_write },		/* write */
566 	{ &vop_lease_desc, filecore_lease_check },	/* lease */
567 	{ &vop_fcntl_desc, filecore_fcntl },		/* fcntl */
568 	{ &vop_ioctl_desc, filecore_ioctl },		/* ioctl */
569 	{ &vop_poll_desc, filecore_poll },		/* poll */
570 	{ &vop_kqfilter_desc, genfs_kqfilter },		/* kqfilter */
571 	{ &vop_revoke_desc, filecore_revoke },		/* revoke */
572 	{ &vop_mmap_desc, filecore_mmap },		/* mmap */
573 	{ &vop_fsync_desc, filecore_fsync },		/* fsync */
574 	{ &vop_seek_desc, filecore_seek },		/* seek */
575 	{ &vop_remove_desc, filecore_remove },		/* remove */
576 	{ &vop_link_desc, filecore_link },		/* link */
577 	{ &vop_rename_desc, filecore_rename },		/* rename */
578 	{ &vop_mkdir_desc, filecore_mkdir },		/* mkdir */
579 	{ &vop_rmdir_desc, filecore_rmdir },		/* rmdir */
580 	{ &vop_symlink_desc, filecore_symlink },	/* symlink */
581 	{ &vop_readdir_desc, filecore_readdir },      	/* readdir */
582 	{ &vop_readlink_desc, filecore_readlink },	/* readlink */
583 	{ &vop_abortop_desc, filecore_abortop },       	/* abortop */
584 	{ &vop_inactive_desc, filecore_inactive },	/* inactive */
585 	{ &vop_reclaim_desc, filecore_reclaim },       	/* reclaim */
586 	{ &vop_lock_desc, genfs_lock },			/* lock */
587 	{ &vop_unlock_desc, genfs_unlock },		/* unlock */
588 	{ &vop_bmap_desc, filecore_bmap },		/* bmap */
589 	{ &vop_strategy_desc, filecore_strategy },	/* strategy */
590 	{ &vop_print_desc, filecore_print },		/* print */
591 	{ &vop_islocked_desc, genfs_islocked },		/* islocked */
592 	{ &vop_pathconf_desc, filecore_pathconf },	/* pathconf */
593 	{ &vop_advlock_desc, filecore_advlock },       	/* advlock */
594 	{ &vop_bwrite_desc, vn_bwrite },		/* bwrite */
595 	{ &vop_getpages_desc, genfs_getpages },		/* getpages */
596 	{ &vop_putpages_desc, genfs_putpages },		/* putpages */
597 	{ NULL, NULL }
598 };
599 const struct vnodeopv_desc filecore_vnodeop_opv_desc =
600 	{ &filecore_vnodeop_p, filecore_vnodeop_entries };
601