aboutsummaryrefslogtreecommitdiffstats
path: root/fs/jfs/resize.c
blob: 45180361871c9a98e04db73506a973e0c0dce0c1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
/*
 *   Copyright (C) International Business Machines  Corp., 2000-2004
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or 
 *   (at your option) any later version.
 * 
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software 
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/

#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/quotaops.h>
#include "jfs_incore.h"
#include "jfs_filsys.h"
#include "jfs_metapage.h"
#include "jfs_dinode.h"
#include "jfs_imap.h"
#include "jfs_dmap.h"
#include "jfs_superblock.h"
#include "jfs_txnmgr.h"
#include "jfs_debug.h"

#define BITSPERPAGE     (PSIZE << 3)
#define L2MEGABYTE      20
#define MEGABYTE        (1 << L2MEGABYTE)
#define MEGABYTE32     (MEGABYTE << 5)

/* convert block number to bmap file page number */
#define BLKTODMAPN(b)\
        (((b) >> 13) + ((b) >> 23) + ((b) >> 33) + 3 + 1)

/*
 *      jfs_extendfs()
 *
 * function: extend file system;
 *
 *   |-------------------------------|----------|----------|
 *   file system space               fsck       inline log
 *                                   workspace  space
 *
 * input:
 *      new LVSize: in LV blocks (required)
 *      new LogSize: in LV blocks (optional)
 *      new FSSize: in LV blocks (optional)
 *
 * new configuration:
 * 1. set new LogSize as specified or default from new LVSize;
 * 2. compute new FSCKSize from new LVSize;
 * 3. set new FSSize as MIN(FSSize, LVSize-(LogSize+FSCKSize)) where
 *    assert(new FSSize >= old FSSize),
 *    i.e., file system must not be shrinked;
 */
int jfs_extendfs(struct super_block *sb, s64 newLVSize, int newLogSize)
{
	int rc = 0;
	struct jfs_sb_info *sbi = JFS_SBI(sb);
	struct inode *ipbmap = sbi->ipbmap;
	struct inode *ipbmap2;
	struct inode *ipimap = sbi->ipimap;
	struct jfs_log *log = sbi->log;
	struct bmap *bmp = sbi->bmap;
	s64 newLogAddress, newFSCKAddress;
	int newFSCKSize;
	s64 newMapSize = 0, mapSize;
	s64 XAddress, XSize, nblocks, xoff, xaddr, t64;
	s64 oldLVSize;
	s64 newFSSize;
	s64 VolumeSize;
	int newNpages = 0, nPages, newPage, xlen, t32;
	int tid;
	int log_formatted = 0;
	struct inode *iplist[1];
	struct jfs_superblock *j_sb, *j_sb2;
	uint old_agsize;
	struct buffer_head *bh, *bh2;

	/* If the volume hasn't grown, get out now */

	if (sbi->mntflag & JFS_INLINELOG)
		oldLVSize = addressPXD(&sbi->logpxd) + lengthPXD(&sbi->logpxd);
	else
		oldLVSize = addressPXD(&sbi->fsckpxd) +
		    lengthPXD(&sbi->fsckpxd);

	if (oldLVSize >= newLVSize) {
		printk(KERN_WARNING
		       "jfs_extendfs: volume hasn't grown, returning\n");
		goto out;
	}

	VolumeSize = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;

	if (VolumeSize) {
		if (newLVSize > VolumeSize) {
			printk(KERN_WARNING "jfs_extendfs: invalid size\n");
			rc = -EINVAL;
			goto out;
		}
	} else {
		/* check the device */
		bh = sb_bread(sb, newLVSize - 1);
		if (!bh) {
			printk(KERN_WARNING "jfs_extendfs: invalid size\n");
			rc = -EINVAL;
			goto out;
		}
		bforget(bh);
	}

	/* Can't extend write-protected drive */

	if (isReadOnly(ipbmap)) {
		printk(KERN_WARNING "jfs_extendfs: read-only file system\n");
		rc = -EROFS;
		goto out;
	}

	/*
	 *      reconfigure LV spaces
	 *      ---------------------
	 *
	 * validate new size, or, if not specified, determine new size
	 */

	/*
	 * reconfigure inline log space:
	 */
	if ((sbi->mntflag & JFS_INLINELOG)) {
		if (newLogSize == 0) {
			/*
			 * no size specified: default to 1/256 of aggregate
			 * size; rounded up to a megabyte boundary;
			 */
			newLogSize = newLVSize >> 8;
			t32 = (1 << (20 - sbi->l2bsize)) - 1;
			newLogSize = (newLogSize + t32) & ~t32;
			newLogSize =
			    min(newLogSize, MEGABYTE32 >> sbi->l2bsize);
		} else {
			/*
			 * convert the newLogSize to fs blocks.
			 *
			 * Since this is given in megabytes, it will always be
			 * an even number of pages.
			 */
			newLogSize = (newLogSize * MEGABYTE) >> sbi->l2bsize;
		}

	} else
		newLogSize = 0;

	newLogAddress = newLVSize - newLogSize;

	/*
	 * reconfigure fsck work space:
	 *
	 * configure it to the end of the logical volume regardless of
	 * whether file system extends to the end of the aggregate;
	 * Need enough 4k pages to cover:
	 *  - 1 bit per block in aggregate rounded up to BPERDMAP boundary
	 *  - 1 extra page to handle control page and intermediate level pages
	 *  - 50 extra pages for the chkdsk service log
	 */
	t64 = ((newLVSize - newLogSize + BPERDMAP - 1) >> L2BPERDMAP)
	    << L2BPERDMAP;
	t32 = ((t64 + (BITSPERPAGE - 1)) / BITSPERPAGE) + 1 + 50;
	newFSCKSize = t32 << sbi->l2nbperpage;
	newFSCKAddress = newLogAddress - newFSCKSize;

	/*
	 * compute new file system space;
	 */
	newFSSize = newLVSize - newLogSize - newFSCKSize;

	/* file system cannot be shrinked */
	if (newFSSize < bmp->db_mapsize) {
		rc = -EINVAL;
		goto out;
	}

	/*
	 * If we're expanding enough that the inline log does not overlap
	 * the old one, we can format the new log before we quiesce the
	 * filesystem.
	 */
	if ((sbi->mntflag & JFS_INLINELOG) && (newLogAddress > oldLVSize)) {
		if ((rc = lmLogFormat(log, newLogAddress, newLogSize)))
			goto out;
		log_formatted = 1;
	}
	/*
	 *      quiesce file system
	 *
	 * (prepare to move the inline log and to prevent map update)
	 *
	 * block any new transactions and wait for completion of
	 * all wip transactions and flush modified pages s.t.
	 * on-disk file system is in consistent state and
	 * log is not required for recovery.
	 */
	txQuiesce(sb);

	/* Reset size of direct inode */
	sbi->direct_inode->i_size =  sb->s_bdev->bd_inode->i_size;

	if (sbi->mntflag & JFS_INLINELOG) {
		/*
		 * deactivate old inline log
		 */
		lmLogShutdown(log);

		/*
		 * mark on-disk super block for fs in transition;
		 *
		 * update on-disk superblock for the new space configuration
		 * of inline log space and fsck work space descriptors:
		 * N.B. FS descriptor is NOT updated;
		 *
		 * crash recovery:
		 * logredo(): if FM_EXTENDFS, return to fsck() for cleanup;
		 * fsck(): if FM_EXTENDFS, reformat inline log and fsck
		 * workspace from superblock inline log descriptor and fsck
		 * workspace descriptor;
		 */

		/* read in superblock */
		if ((rc = readSuper(sb, &bh)))
			goto error_out;
		j_sb = (struct jfs_superblock *)bh->b_data;

		/* mark extendfs() in progress */
		j_sb->s_state |= cpu_to_le32(FM_EXTENDFS);
		j_sb->s_xsize = cpu_to_le64(newFSSize);
		PXDaddress(&j_sb->s_xfsckpxd, newFSCKAddress);
		PXDlength(&j_sb->s_xfsckpxd, newFSCKSize);
		PXDaddress(&j_sb->s_xlogpxd, newLogAddress);
		PXDlength(&j_sb->s_xlogpxd, newLogSize);

		/* synchronously update superblock */
		mark_buffer_dirty(bh);
		sync_dirty_buffer(bh);
		brelse(bh);

		/*
		 * format new inline log synchronously;
		 *
		 * crash recovery: if log move in progress,
		 * reformat log and exit success;
		 */
		if (!log_formatted)
			if ((rc = lmLogFormat(log, newLogAddress, newLogSize)))
				goto error_out;

		/*
		 * activate new log
		 */
		log->base = newLogAddress;
		log->size = newLogSize >> (L2LOGPSIZE - sb->s_blocksize_bits);
		if ((rc = lmLogInit(log)))
			goto error_out;
	}

	/*
	 *      extend block allocation map
	 *      ---------------------------
	 *
	 * extendfs() for new extension, retry after crash recovery;
	 *
	 * note: both logredo() and fsck() rebuild map from
	 * the bitmap and configuration parameter from superblock
	 * (disregarding all other control information in the map);
	 *
	 * superblock:
	 *  s_size: aggregate size in physical blocks;
	 */
	/*
	 *      compute the new block allocation map configuration
	 *
	 * map dinode:
	 *  di_size: map file size in byte;
	 *  di_nblocks: number of blocks allocated for map file;
	 *  di_mapsize: number of blocks in aggregate (covered by map);
	 * map control page:
	 *  db_mapsize: number of blocks in aggregate (covered by map);
	 */
	newMapSize = newFSSize;
	/* number of data pages of new bmap file:
	 * roundup new size to full dmap page boundary and
	 * add 1 extra dmap page for next extendfs()
	 */
	t64 = (newMapSize - 1) + BPERDMAP;
	newNpages = BLKTODMAPN(t64) + 1;

	/*
	 *      extend map from current map (WITHOUT growing mapfile)
	 *
	 * map new extension with unmapped part of the last partial
	 * dmap page, if applicable, and extra page(s) allocated
	 * at end of bmap by mkfs() or previous extendfs();
	 */
      extendBmap:
	/* compute number of blocks requested to extend */
	mapSize = bmp->db_mapsize;
	XAddress = mapSize;	/* eXtension Address */
	XSize = newMapSize - mapSize;	/* eXtension Size */
	old_agsize = bmp->db_agsize;	/* We need to know if this changes */

	/* compute number of blocks that can be extended by current mapfile */
	t64 = dbMapFileSizeToMapSize(ipbmap);
	if (mapSize > t64) {
		printk(KERN_ERR "jfs_extendfs: mapSize (0x%Lx) > t64 (0x%Lx)\n",
		       (long long) mapSize, (long long) t64);
		rc = -EIO;
		goto error_out;
	}
	nblocks = min(t64 - mapSize, XSize);

	/*
	 * update map pages for new extension:
	 *
	 * update/init dmap and bubble up the control hierarchy
	 * incrementally fold up dmaps into upper levels;
	 * update bmap control page;
	 */
	if ((rc = dbExtendFS(ipbmap, XAddress, nblocks)))
		goto error_out;
	/*
	 * the map now has extended to cover additional nblocks:
	 * dn_mapsize = oldMapsize + nblocks;
	 */
	/* ipbmap->i_mapsize += nblocks; */
	XSize -= nblocks;

	/*
	 *      grow map file to cover remaining extension
	 *      and/or one extra dmap page for next extendfs();
	 *
	 * allocate new map pages and its backing blocks, and
	 * update map file xtree
	 */
	/* compute number of data pages of current bmap file */
	nPages = ipbmap->i_size >> L2PSIZE;

	/* need to grow map file ? */
	if (nPages == newNpages)
		goto finalizeBmap;

	/*
	 * grow bmap file for the new map pages required:
	 *
	 * allocate growth at the start of newly extended region;
	 * bmap file only grows sequentially, i.e., both data pages
	 * and possibly xtree index pages may grow in append mode,
	 * s.t. logredo() can reconstruct pre-extension state
	 * by washing away bmap file of pages outside s_size boundary;
	 */
	/*
	 * journal map file growth as if a regular file growth:
	 * (note: bmap is created with di_mode = IFJOURNAL|IFREG);
	 *
	 * journaling of bmap file growth is not required since
	 * logredo() do/can not use log records of bmap file growth
	 * but it provides careful write semantics, pmap update, etc.;
	 */
	/* synchronous write of data pages: bmap data pages are
	 * cached in meta-data cache, and not written out
	 * by txCommit();
	 */
	filemap_fdatawait(ipbmap->i_mapping);
	filemap_write_and_wait(ipbmap->i_mapping);
	diWriteSpecial(ipbmap, 0);

	newPage = nPages;	/* first new page number */
	xoff = newPage << sbi->l2nbperpage;
	xlen = (newNpages - nPages) << sbi->l2nbperpage;
	xlen = min(xlen, (int) nblocks) & ~(sbi->nbperpage - 1);
	xaddr = XAddress;

	tid = txBegin(sb, COMMIT_FORCE);

	if ((rc = xtAppend(tid, ipbmap, 0, xoff, nblocks, &xlen, &xaddr, 0))) {
		txEnd(tid);
		goto error_out;
	}
	/* update bmap file size */
	ipbmap->i_size += xlen << sbi->l2bsize;
	inode_add_bytes(ipbmap, xlen << sbi->l2bsize);

	iplist[0] = ipbmap;
	rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);

	txEnd(tid);

	if (rc)
		goto error_out;

	/*
	 * map file has been grown now to cover extension to further out;
	 * di_size = new map file size;
	 *
	 * if huge extension, the previous extension based on previous
	 * map file size may not have been sufficient to cover whole extension
	 * (it could have been used up for new map pages),
	 * but the newly grown map file now covers lot bigger new free space
	 * available for further extension of map;
	 */
	/* any more blocks to extend ? */
	if (XSize)
		goto extendBmap;

      finalizeBmap:
	/* finalize bmap */
	dbFinalizeBmap(ipbmap);

	/*
	 *      update inode allocation map
	 *      ---------------------------
	 *
	 * move iag lists from old to new iag;
	 * agstart field is not updated for logredo() to reconstruct
	 * iag lists if system crash occurs.
	 * (computation of ag number from agstart based on agsize
	 * will correctly identify the new ag);
	 */
	/* if new AG size the same as old AG size, done! */
	if (bmp->db_agsize != old_agsize) {
		if ((rc = diExtendFS(ipimap, ipbmap)))
			goto error_out;

		/* finalize imap */
		if ((rc = diSync(ipimap)))
			goto error_out;
	}

	/*
	 *      finalize
	 *      --------
	 *
	 * extension is committed when on-disk super block is
	 * updated with new descriptors: logredo will recover
	 * crash before it to pre-extension state;
	 */

	/* sync log to skip log replay of bmap file growth transaction; */
	/* lmLogSync(log, 1); */

	/*
	 * synchronous write bmap global control page;
	 * for crash before completion of write
	 * logredo() will recover to pre-extendfs state;
	 * for crash after completion of write,
	 * logredo() will recover post-extendfs state;
	 */
	if ((rc = dbSync(ipbmap)))
		goto error_out;

	/*
	 * copy primary bmap inode to secondary bmap inode
	 */

	ipbmap2 = diReadSpecial(sb, BMAP_I, 1);
	if (ipbmap2 == NULL) {
		printk(KERN_ERR "jfs_extendfs: diReadSpecial(bmap) failed\n");
		goto error_out;
	}
	memcpy(&JFS_IP(ipbmap2)->i_xtroot, &JFS_IP(ipbmap)->i_xtroot, 288);
	ipbmap2->i_size = ipbmap->i_size;
	ipbmap2->i_blocks = ipbmap->i_blocks;

	diWriteSpecial(ipbmap2, 1);
	diFreeSpecial(ipbmap2);

	/*
	 *      update superblock
	 */
	if ((rc = readSuper(sb, &bh)))
		goto error_out;
	j_sb = (struct jfs_superblock *)bh->b_data;

	/* mark extendfs() completion */
	j_sb->s_state &= cpu_to_le32(~FM_EXTENDFS);
	j_sb->s_size = cpu_to_le64(bmp->db_mapsize <<
				   le16_to_cpu(j_sb->s_l2bfactor));
	j_sb->s_agsize = cpu_to_le32(bmp->db_agsize);

	/* update inline log space descriptor */
	if (sbi->mntflag & JFS_INLINELOG) {
		PXDaddress(&(j_sb->s_logpxd), newLogAddress);
		PXDlength(&(j_sb->s_logpxd), newLogSize);
	}

	/* record log's mount serial number */
	j_sb->s_logserial = cpu_to_le32(log->serial);

	/* update fsck work space descriptor */
	PXDaddress(&(j_sb->s_fsckpxd), newFSCKAddress);
	PXDlength(&(j_sb->s_fsckpxd), newFSCKSize);
	j_sb->s_fscklog = 1;
	/* sb->s_fsckloglen remains the same */

	/* Update secondary superblock */
	bh2 = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits);
	if (bh2) {
		j_sb2 = (struct jfs_superblock *)bh2->b_data;
		memcpy(j_sb2, j_sb, sizeof (struct jfs_superblock));

		mark_buffer_dirty(bh);
		sync_dirty_buffer(bh2);
		brelse(bh2);
	}

	/* write primary superblock */
	mark_buffer_dirty(bh);
	sync_dirty_buffer(bh);
	brelse(bh);

	goto resume;

      error_out:
	jfs_error(sb, "jfs_extendfs");

      resume:
	/*
	 *      resume file system transactions
	 */
	txResume(sb);

      out:
	return rc;
}