xref: /minix/sys/fs/udf/udf_strat_direct.c (revision ebfedea0) 
1 /* $NetBSD: udf_strat_direct.c,v 1.12 2013/10/30 08:41:38 mrg Exp $ */
2 
3 /*
4  * Copyright (c) 2006, 2008 Reinoud Zandijk
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  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  *
27  */
28 
29 #include <sys/cdefs.h>
30 #ifndef lint
31 __KERNEL_RCSID(0, "$NetBSD: udf_strat_direct.c,v 1.12 2013/10/30 08:41:38 mrg Exp $");
32 #endif /* not lint */
33 
34 
35 #if defined(_KERNEL_OPT)
36 #include "opt_compat_netbsd.h"
37 #endif
38 
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/sysctl.h>
42 #include <sys/namei.h>
43 #include <sys/proc.h>
44 #include <sys/kernel.h>
45 #include <sys/vnode.h>
46 #include <miscfs/genfs/genfs_node.h>
47 #include <sys/mount.h>
48 #include <sys/buf.h>
49 #include <sys/file.h>
50 #include <sys/device.h>
51 #include <sys/disklabel.h>
52 #include <sys/ioctl.h>
53 #include <sys/malloc.h>
54 #include <sys/dirent.h>
55 #include <sys/stat.h>
56 #include <sys/conf.h>
57 #include <sys/kauth.h>
58 #include <sys/kthread.h>
59 #include <dev/clock_subr.h>
60 
61 #include <fs/udf/ecma167-udf.h>
62 #include <fs/udf/udf_mount.h>
63 
64 #include "udf.h"
65 #include "udf_subr.h"
66 #include "udf_bswap.h"
67 
68 
69 #define VTOI(vnode) ((struct udf_node *) vnode->v_data)
70 #define PRIV(ump) ((struct strat_private *) ump->strategy_private)
71 
72 /* --------------------------------------------------------------------- */
73 
74 /* BUFQ's */
75 #define UDF_SHED_MAX 3
76 
77 #define UDF_SHED_READING	0
78 #define UDF_SHED_WRITING	1
79 #define UDF_SHED_SEQWRITING	2
80 
81 
82 struct strat_private {
83 	struct pool		desc_pool;	 /* node descriptors */
84 };
85 
86 /* --------------------------------------------------------------------- */
87 
88 static void
89 udf_wr_nodedscr_callback(struct buf *buf)
90 {
91 	struct udf_node *udf_node;
92 
93 	KASSERT(buf);
94 	KASSERT(buf->b_data);
95 
96 	/* called when write action is done */
97 	DPRINTF(WRITE, ("udf_wr_nodedscr_callback(): node written out\n"));
98 
99 	udf_node = VTOI(buf->b_vp);
100 	if (udf_node == NULL) {
101 		putiobuf(buf);
102 		printf("udf_wr_node_callback: NULL node?\n");
103 		return;
104 	}
105 
106 	/* XXX right flags to mark dirty again on error? */
107 	if (buf->b_error) {
108 		/* write error on `defect free' media??? how to solve? */
109 		/* XXX lookup UDF standard for unallocatable space */
110 		udf_node->i_flags |= IN_MODIFIED | IN_ACCESSED;
111 	}
112 
113 	/* decrement outstanding_nodedscr */
114 	KASSERT(udf_node->outstanding_nodedscr >= 1);
115 	udf_node->outstanding_nodedscr--;
116 	if (udf_node->outstanding_nodedscr == 0) {
117 		/* unlock the node */
118 		UDF_UNLOCK_NODE(udf_node, 0);
119 		wakeup(&udf_node->outstanding_nodedscr);
120 	}
121 	/* unreference the vnode so it can be recycled */
122 	holdrele(udf_node->vnode);
123 
124 	putiobuf(buf);
125 }
126 
127 /* --------------------------------------------------------------------- */
128 
129 static int
130 udf_getblank_nodedscr_direct(struct udf_strat_args *args)
131 {
132 	union dscrptr   **dscrptr = &args->dscr;
133 	struct udf_mount *ump = args->ump;
134 	struct strat_private *priv = PRIV(ump);
135 	uint32_t lb_size;
136 
137 	lb_size = udf_rw32(ump->logical_vol->lb_size);
138 	*dscrptr = pool_get(&priv->desc_pool, PR_WAITOK);
139 	memset(*dscrptr, 0, lb_size);
140 
141 	return 0;
142 }
143 
144 
145 static void
146 udf_free_nodedscr_direct(struct udf_strat_args *args)
147 {
148 	union dscrptr    *dscr = args->dscr;
149 	struct udf_mount *ump  = args->ump;
150 	struct strat_private *priv = PRIV(ump);
151 
152 	pool_put(&priv->desc_pool, dscr);
153 }
154 
155 
156 static int
157 udf_read_nodedscr_direct(struct udf_strat_args *args)
158 {
159 	union dscrptr   **dscrptr = &args->dscr;
160 	union dscrptr    *tmpdscr;
161 	struct udf_mount *ump = args->ump;
162 	struct long_ad   *icb = args->icb;
163 	struct strat_private *priv = PRIV(ump);
164 	uint32_t lb_size;
165 	uint32_t sector, dummy;
166 	int error;
167 
168 	lb_size = udf_rw32(ump->logical_vol->lb_size);
169 
170 	error = udf_translate_vtop(ump, icb, &sector, &dummy);
171 	if (error)
172 		return error;
173 
174 	/* try to read in fe/efe */
175 	error = udf_read_phys_dscr(ump, sector, M_UDFTEMP, &tmpdscr);
176 	if (error)
177 		return error;
178 
179 	*dscrptr = pool_get(&priv->desc_pool, PR_WAITOK);
180 	memcpy(*dscrptr, tmpdscr, lb_size);
181 	free(tmpdscr, M_UDFTEMP);
182 
183 	return 0;
184 }
185 
186 
187 static int
188 udf_write_nodedscr_direct(struct udf_strat_args *args)
189 {
190 	struct udf_mount *ump      = args->ump;
191 	struct udf_node  *udf_node = args->udf_node;
192 	union dscrptr    *dscr     = args->dscr;
193 	struct long_ad   *icb      = args->icb;
194 	int               waitfor  = args->waitfor;
195 	uint32_t logsector, sector, dummy;
196 	int error, vpart __diagused;
197 
198 	/*
199 	 * we have to decide if we write it out sequential or at its fixed
200 	 * position by examining the partition its (to be) written on.
201 	 */
202 	vpart     = udf_rw16(udf_node->loc.loc.part_num);
203 	logsector = udf_rw32(icb->loc.lb_num);
204 	KASSERT(ump->vtop_tp[vpart] != UDF_VTOP_TYPE_VIRT);
205 
206 	sector = 0;
207 	error  = udf_translate_vtop(ump, icb, &sector, &dummy);
208 	if (error)
209 		goto out;
210 
211 	/* add reference to the vnode to prevent recycling */
212 	vhold(udf_node->vnode);
213 
214 	if (waitfor) {
215 		DPRINTF(WRITE, ("udf_write_nodedscr: sync write\n"));
216 
217 		error = udf_write_phys_dscr_sync(ump, udf_node, UDF_C_NODE,
218 			dscr, sector, logsector);
219 	} else {
220 		DPRINTF(WRITE, ("udf_write_nodedscr: no wait, async write\n"));
221 
222 		error = udf_write_phys_dscr_async(ump, udf_node, UDF_C_NODE,
223 			dscr, sector, logsector, udf_wr_nodedscr_callback);
224 		/* will be UNLOCKED in call back */
225 		return error;
226 	}
227 
228 	holdrele(udf_node->vnode);
229 out:
230 	udf_node->outstanding_nodedscr--;
231 	if (udf_node->outstanding_nodedscr == 0) {
232 		UDF_UNLOCK_NODE(udf_node, 0);
233 		wakeup(&udf_node->outstanding_nodedscr);
234 	}
235 
236 	return error;
237 }
238 
239 /* --------------------------------------------------------------------- */
240 
241 static void
242 udf_queue_buf_direct(struct udf_strat_args *args)
243 {
244 	struct udf_mount *ump = args->ump;
245 	struct buf *buf = args->nestbuf;
246 	struct buf *nestbuf;
247 	struct desc_tag *tag;
248 	struct long_ad *node_ad_cpy;
249 	uint64_t *lmapping, *pmapping, *lmappos, run_start;
250 	uint32_t sectornr;
251 	uint32_t buf_offset, rbuflen, bpos;
252 	uint16_t vpart_num;
253 	uint8_t *fidblk;
254 	off_t rblk;
255 	int sector_size = ump->discinfo.sector_size;
256 	int len, buf_len, sector, sectors, run_length;
257 	int blks = sector_size / DEV_BSIZE;
258 	int what, class __diagused, queue;
259 
260 	KASSERT(ump);
261 	KASSERT(buf);
262 	KASSERT(buf->b_iodone == nestiobuf_iodone);
263 
264 	what = buf->b_udf_c_type;
265 	queue = UDF_SHED_READING;
266 	if ((buf->b_flags & B_READ) == 0) {
267 		/* writing */
268 		queue = UDF_SHED_SEQWRITING;
269 		if (what == UDF_C_ABSOLUTE)
270 			queue = UDF_SHED_WRITING;
271 		if (what == UDF_C_DSCR)
272 			queue = UDF_SHED_WRITING;
273 		if (what == UDF_C_NODE)
274 			queue = UDF_SHED_WRITING;
275 	}
276 
277 	/* use disc sheduler */
278 	class = ump->discinfo.mmc_class;
279 	KASSERT((class == MMC_CLASS_UNKN) || (class == MMC_CLASS_DISC) ||
280 		(ump->discinfo.mmc_cur & MMC_CAP_HW_DEFECTFREE) ||
281 		(ump->vfs_mountp->mnt_flag & MNT_RDONLY));
282 
283 #ifndef UDF_DEBUG
284 	__USE(blks);
285 #endif
286 	if (queue == UDF_SHED_READING) {
287 		DPRINTF(SHEDULE, ("\nudf_issue_buf READ %p : sector %d type %d,"
288 			"b_resid %d, b_bcount %d, b_bufsize %d\n",
289 			buf, (uint32_t) buf->b_blkno / blks, buf->b_udf_c_type,
290 			buf->b_resid, buf->b_bcount, buf->b_bufsize));
291 		VOP_STRATEGY(ump->devvp, buf);
292 		return;
293 	}
294 
295 
296 	if (queue == UDF_SHED_WRITING) {
297 		DPRINTF(SHEDULE, ("\nudf_issue_buf WRITE %p : sector %d "
298 			"type %d, b_resid %d, b_bcount %d, b_bufsize %d\n",
299 			buf, (uint32_t) buf->b_blkno / blks, buf->b_udf_c_type,
300 			buf->b_resid, buf->b_bcount, buf->b_bufsize));
301 		KASSERT(buf->b_udf_c_type == UDF_C_DSCR ||
302 			buf->b_udf_c_type == UDF_C_ABSOLUTE ||
303 			buf->b_udf_c_type == UDF_C_NODE);
304 		 udf_fixup_node_internals(ump, buf->b_data, buf->b_udf_c_type);
305 		VOP_STRATEGY(ump->devvp, buf);
306 		return;
307 	}
308 
309 	/* UDF_SHED_SEQWRITING */
310 	KASSERT(queue == UDF_SHED_SEQWRITING);
311 	DPRINTF(SHEDULE, ("\nudf_issue_buf SEQWRITE %p : sector XXXX "
312 		"type %d, b_resid %d, b_bcount %d, b_bufsize %d\n",
313 		buf, buf->b_udf_c_type, buf->b_resid, buf->b_bcount,
314 		buf->b_bufsize));
315 
316 	/*
317 	 * Buffers should not have been allocated to disc addresses yet on
318 	 * this queue. Note that a buffer can get multiple extents allocated.
319 	 *
320 	 * lmapping contains lb_num relative to base partition.
321 	 */
322 	lmapping    = ump->la_lmapping;
323 	node_ad_cpy = ump->la_node_ad_cpy;
324 
325 	/* logically allocate buf and map it in the file */
326 	udf_late_allocate_buf(ump, buf, lmapping, node_ad_cpy, &vpart_num);
327 
328 	/* if we have FIDs, fixup using the new allocation table */
329 	if (buf->b_udf_c_type == UDF_C_FIDS) {
330 		buf_len = buf->b_bcount;
331 		bpos = 0;
332 		lmappos = lmapping;
333 		while (buf_len) {
334 			sectornr = *lmappos++;
335 			len = MIN(buf_len, sector_size);
336 			fidblk = (uint8_t *) buf->b_data + bpos;
337 			udf_fixup_fid_block(fidblk, sector_size,
338 				0, len, sectornr);
339 			bpos += len;
340 			buf_len -= len;
341 		}
342 	}
343 	if (buf->b_udf_c_type == UDF_C_METADATA_SBM) {
344 		if (buf->b_lblkno == 0) {
345 			/* update the tag location inside */
346 			tag = (struct desc_tag *) buf->b_data;
347 			tag->tag_loc = udf_rw32(*lmapping);
348 			udf_validate_tag_and_crc_sums(buf->b_data);
349 		}
350 	}
351 	udf_fixup_node_internals(ump, buf->b_data, buf->b_udf_c_type);
352 
353 	/*
354 	 * Translate new mappings in lmapping to pmappings and try to
355 	 * conglomerate extents to reduce the number of writes.
356 	 *
357 	 * pmapping to contain lb_nums as used for disc adressing.
358 	 */
359 	pmapping = ump->la_pmapping;
360 	sectors  = (buf->b_bcount + sector_size -1) / sector_size;
361 	udf_translate_vtop_list(ump, sectors, vpart_num, lmapping, pmapping);
362 
363 	for (sector = 0; sector < sectors; sector++) {
364 		buf_offset = sector * sector_size;
365 		DPRINTF(WRITE, ("\tprocessing rel sector %d\n", sector));
366 
367 		DPRINTF(WRITE, ("\tissue write sector %"PRIu64"\n",
368 			pmapping[sector]));
369 
370 		run_start  = pmapping[sector];
371 		run_length = 1;
372 		while (sector < sectors-1) {
373 			if (pmapping[sector+1] != pmapping[sector]+1)
374 				break;
375 			run_length++;
376 			sector++;
377 		}
378 
379 		/* nest an iobuf for the extent */
380 		rbuflen = run_length *  sector_size;
381 		rblk    = run_start  * (sector_size/DEV_BSIZE);
382 
383 		nestbuf = getiobuf(NULL, true);
384 		nestiobuf_setup(buf, nestbuf, buf_offset, rbuflen);
385 		/* nestbuf is B_ASYNC */
386 
387 		/* identify this nestbuf */
388 		nestbuf->b_lblkno   = sector;
389 		assert(nestbuf->b_vp == buf->b_vp);
390 
391 		/* CD shedules on raw blkno */
392 		nestbuf->b_blkno      = rblk;
393 		nestbuf->b_proc       = NULL;
394 		nestbuf->b_rawblkno   = rblk;
395 		nestbuf->b_udf_c_type = UDF_C_PROCESSED;
396 
397 		VOP_STRATEGY(ump->devvp, nestbuf);
398 	}
399 }
400 
401 
402 static void
403 udf_discstrat_init_direct(struct udf_strat_args *args)
404 {
405 	struct udf_mount  *ump = args->ump;
406 	struct strat_private *priv = PRIV(ump);
407 	uint32_t lb_size;
408 
409 	KASSERT(priv == NULL);
410 	ump->strategy_private = malloc(sizeof(struct strat_private),
411 		M_UDFTEMP, M_WAITOK);
412 	priv = ump->strategy_private;
413 	memset(priv, 0 , sizeof(struct strat_private));
414 
415 	/*
416 	 * Initialise pool for descriptors associated with nodes. This is done
417 	 * in lb_size units though currently lb_size is dictated to be
418 	 * sector_size.
419 	 */
420 	memset(&priv->desc_pool, 0, sizeof(struct pool));
421 
422 	lb_size = udf_rw32(ump->logical_vol->lb_size);
423 	pool_init(&priv->desc_pool, lb_size, 0, 0, 0, "udf_desc_pool", NULL,
424 	    IPL_NONE);
425 }
426 
427 
428 static void
429 udf_discstrat_finish_direct(struct udf_strat_args *args)
430 {
431 	struct udf_mount *ump = args->ump;
432 	struct strat_private *priv = PRIV(ump);
433 
434 	/* destroy our pool */
435 	pool_destroy(&priv->desc_pool);
436 
437 	/* free our private space */
438 	free(ump->strategy_private, M_UDFTEMP);
439 	ump->strategy_private = NULL;
440 }
441 
442 /* --------------------------------------------------------------------- */
443 
444 struct udf_strategy udf_strat_direct =
445 {
446 	udf_getblank_nodedscr_direct,
447 	udf_free_nodedscr_direct,
448 	udf_read_nodedscr_direct,
449 	udf_write_nodedscr_direct,
450 	udf_queue_buf_direct,
451 	udf_discstrat_init_direct,
452 	udf_discstrat_finish_direct
453 };
454 
455