summaryrefslogtreecommitdiffstats
path: root/fs/jfs/jfs_mount.c
blob: c535ffd638e8773ed08782751881a3c520c0c7ec (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
/*
 *   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
 */

/*
 * Module: jfs_mount.c
 *
 * note: file system in transition to aggregate/fileset:
 *
 * file system mount is interpreted as the mount of aggregate, 
 * if not already mounted, and mount of the single/only fileset in 
 * the aggregate;
 *
 * a file system/aggregate is represented by an internal inode
 * (aka mount inode) initialized with aggregate superblock;
 * each vfs represents a fileset, and points to its "fileset inode 
 * allocation map inode" (aka fileset inode):
 * (an aggregate itself is structured recursively as a filset: 
 * an internal vfs is constructed and points to its "fileset inode 
 * allocation map inode" (aka aggregate inode) where each inode 
 * represents a fileset inode) so that inode number is mapped to 
 * on-disk inode in uniform way at both aggregate and fileset level;
 *
 * each vnode/inode of a fileset is linked to its vfs (to facilitate
 * per fileset inode operations, e.g., unmount of a fileset, etc.);
 * each inode points to the mount inode (to facilitate access to
 * per aggregate information, e.g., block size, etc.) as well as
 * its file set inode.
 *
 *   aggregate 
 *   ipmnt
 *   mntvfs -> fileset ipimap+ -> aggregate ipbmap -> aggregate ipaimap;
 *             fileset vfs     -> vp(1) <-> ... <-> vp(n) <->vproot;
 */

#include <linux/fs.h>
#include <linux/buffer_head.h>

#include "jfs_incore.h"
#include "jfs_filsys.h"
#include "jfs_superblock.h"
#include "jfs_dmap.h"
#include "jfs_imap.h"
#include "jfs_metapage.h"
#include "jfs_debug.h"


/*
 * forward references
 */
static int chkSuper(struct super_block *);
static int logMOUNT(struct super_block *sb);

/*
 * NAME:	jfs_mount(sb)
 *
 * FUNCTION:	vfs_mount()
 *
 * PARAMETER:	sb	- super block
 *
 * RETURN:	-EBUSY	- device already mounted or open for write
 *		-EBUSY	- cvrdvp already mounted;
 *		-EBUSY	- mount table full
 *		-ENOTDIR- cvrdvp not directory on a device mount
 *		-ENXIO	- device open failure
 */
int jfs_mount(struct super_block *sb)
{
	int rc = 0;		/* Return code          */
	struct jfs_sb_info *sbi = JFS_SBI(sb);
	struct inode *ipaimap = NULL;
	struct inode *ipaimap2 = NULL;
	struct inode *ipimap = NULL;
	struct inode *ipbmap = NULL;

	/*
	 * read/validate superblock 
	 * (initialize mount inode from the superblock)
	 */
	if ((rc = chkSuper(sb))) {
		goto errout20;
	}

	ipaimap = diReadSpecial(sb, AGGREGATE_I, 0);
	if (ipaimap == NULL) {
		jfs_err("jfs_mount: Faild to read AGGREGATE_I");
		rc = -EIO;
		goto errout20;
	}
	sbi->ipaimap = ipaimap;

	jfs_info("jfs_mount: ipaimap:0x%p", ipaimap);

	/*
	 * initialize aggregate inode allocation map
	 */
	if ((rc = diMount(ipaimap))) {
		jfs_err("jfs_mount: diMount(ipaimap) failed w/rc = %d", rc);
		goto errout21;
	}

	/*
	 * open aggregate block allocation map
	 */
	ipbmap = diReadSpecial(sb, BMAP_I, 0);
	if (ipbmap == NULL) {
		rc = -EIO;
		goto errout22;
	}

	jfs_info("jfs_mount: ipbmap:0x%p", ipbmap);

	sbi->ipbmap = ipbmap;

	/*
	 * initialize aggregate block allocation map
	 */
	if ((rc = dbMount(ipbmap))) {
		jfs_err("jfs_mount: dbMount failed w/rc = %d", rc);
		goto errout22;
	}

	/*
	 * open the secondary aggregate inode allocation map
	 *
	 * This is a duplicate of the aggregate inode allocation map.
	 *
	 * hand craft a vfs in the same fashion as we did to read ipaimap.
	 * By adding INOSPEREXT (32) to the inode number, we are telling
	 * diReadSpecial that we are reading from the secondary aggregate
	 * inode table.  This also creates a unique entry in the inode hash
	 * table.
	 */
	if ((sbi->mntflag & JFS_BAD_SAIT) == 0) {
		ipaimap2 = diReadSpecial(sb, AGGREGATE_I, 1);
		if (ipaimap2 == 0) {
			jfs_err("jfs_mount: Faild to read AGGREGATE_I");
			rc = -EIO;
			goto errout35;
		}
		sbi->ipaimap2 = ipaimap2;

		jfs_info("jfs_mount: ipaimap2:0x%p", ipaimap2);

		/*
		 * initialize secondary aggregate inode allocation map
		 */
		if ((rc = diMount(ipaimap2))) {
			jfs_err("jfs_mount: diMount(ipaimap2) failed, rc = %d",
				rc);
			goto errout35;
		}
	} else
		/* Secondary aggregate inode table is not valid */
		sbi->ipaimap2 = NULL;

	/*
	 *      mount (the only/single) fileset
	 */
	/*
	 * open fileset inode allocation map (aka fileset inode)
	 */
	ipimap = diReadSpecial(sb, FILESYSTEM_I, 0);
	if (ipimap == NULL) {
		jfs_err("jfs_mount: Failed to read FILESYSTEM_I");
		/* open fileset secondary inode allocation map */
		rc = -EIO;
		goto errout40;
	}
	jfs_info("jfs_mount: ipimap:0x%p", ipimap);

	/* map further access of per fileset inodes by the fileset inode */
	sbi->ipimap = ipimap;

	/* initialize fileset inode allocation map */
	if ((rc = diMount(ipimap))) {
		jfs_err("jfs_mount: diMount failed w/rc = %d", rc);
		goto errout41;
	}

	goto out;

	/*
	 *      unwind on error
	 */
      errout41:		/* close fileset inode allocation map inode */
	diFreeSpecial(ipimap);

      errout40:		/* fileset closed */

	/* close secondary aggregate inode allocation map */
	if (ipaimap2) {
		diUnmount(ipaimap2, 1);
		diFreeSpecial(ipaimap2);
	}

      errout35:

	/* close aggregate block allocation map */
	dbUnmount(ipbmap, 1);
	diFreeSpecial(ipbmap);

      errout22:		/* close aggregate inode allocation map */

	diUnmount(ipaimap, 1);

      errout21:		/* close aggregate inodes */
	diFreeSpecial(ipaimap);
      errout20:		/* aggregate closed */

      out:

	if (rc)
		jfs_err("Mount JFS Failure: %d", rc);

	return rc;
}

/*
 * NAME:	jfs_mount_rw(sb, remount)
 *
 * FUNCTION:	Completes read-write mount, or remounts read-only volume
 *		as read-write
 */
int jfs_mount_rw(struct super_block *sb, int remount)
{
	struct jfs_sb_info *sbi = JFS_SBI(sb);  
	int rc;

	/*
	 * If we are re-mounting a previously read-only volume, we want to
	 * re-read the inode and block maps, since fsck.jfs may have updated
	 * them.
	 */
	if (remount) {
		if (chkSuper(sb) || (sbi->state != FM_CLEAN))
			return -EINVAL;

		truncate_inode_pages(sbi->ipimap->i_mapping, 0);
		truncate_inode_pages(sbi->ipbmap->i_mapping, 0);
		diUnmount(sbi->ipimap, 1);
		if ((rc = diMount(sbi->ipimap))) {
			jfs_err("jfs_mount_rw: diMount failed!");
			return rc;
		}

		dbUnmount(sbi->ipbmap, 1);
		if ((rc = dbMount(sbi->ipbmap))) {
			jfs_err("jfs_mount_rw: dbMount failed!");
			return rc;
		}
	}

	/*
	 * open/initialize log
	 */
	if ((rc = lmLogOpen(sb)))
		return rc;

	/*
	 * update file system superblock;
	 */
	if ((rc = updateSuper(sb, FM_MOUNT))) {
		jfs_err("jfs_mount: updateSuper failed w/rc = %d", rc);
		lmLogClose(sb);
		return rc;
	}

	/*
	 * write MOUNT log record of the file system
	 */
	logMOUNT(sb);

	/*
	 * Set page cache allocation policy
	 */
	mapping_set_gfp_mask(sb->s_bdev->bd_inode->i_mapping, GFP_NOFS);

	return rc;
}

/*
 *	chkSuper()
 *
 * validate the superblock of the file system to be mounted and 
 * get the file system parameters.
 *
 * returns
 *	0 with fragsize set if check successful
 *	error code if not successful
 */
static int chkSuper(struct super_block *sb)
{
	int rc = 0;
	struct jfs_sb_info *sbi = JFS_SBI(sb);
	struct jfs_superblock *j_sb;
	struct buffer_head *bh;
	int AIM_bytesize, AIT_bytesize;
	int expected_AIM_bytesize, expected_AIT_bytesize;
	s64 AIM_byte_addr, AIT_byte_addr, fsckwsp_addr;
	s64 byte_addr_diff0, byte_addr_diff1;
	s32 bsize;

	if ((rc = readSuper(sb, &bh)))
		return rc;
	j_sb = (struct jfs_superblock *)bh->b_data;

	/*
	 * validate superblock
	 */
	/* validate fs signature */
	if (strncmp(j_sb->s_magic, JFS_MAGIC, 4) ||
	    le32_to_cpu(j_sb->s_version) > JFS_VERSION) {
		rc = -EINVAL;
		goto out;
	}

	bsize = le32_to_cpu(j_sb->s_bsize);
#ifdef _JFS_4K
	if (bsize != PSIZE) {
		jfs_err("Currently only 4K block size supported!");
		rc = -EINVAL;
		goto out;
	}
#endif				/* _JFS_4K */

	jfs_info("superblock: flag:0x%08x state:0x%08x size:0x%Lx",
		 le32_to_cpu(j_sb->s_flag), le32_to_cpu(j_sb->s_state),
		 (unsigned long long) le64_to_cpu(j_sb->s_size));

	/* validate the descriptors for Secondary AIM and AIT */
	if ((j_sb->s_flag & cpu_to_le32(JFS_BAD_SAIT)) !=
	    cpu_to_le32(JFS_BAD_SAIT)) {
		expected_AIM_bytesize = 2 * PSIZE;
		AIM_bytesize = lengthPXD(&(j_sb->s_aim2)) * bsize;
		expected_AIT_bytesize = 4 * PSIZE;
		AIT_bytesize = lengthPXD(&(j_sb->s_ait2)) * bsize;
		AIM_byte_addr = addressPXD(&(j_sb->s_aim2)) * bsize;
		AIT_byte_addr = addressPXD(&(j_sb->s_ait2)) * bsize;
		byte_addr_diff0 = AIT_byte_addr - AIM_byte_addr;
		fsckwsp_addr = addressPXD(&(j_sb->s_fsckpxd)) * bsize;
		byte_addr_diff1 = fsckwsp_addr - AIT_byte_addr;
		if ((AIM_bytesize != expected_AIM_bytesize) ||
		    (AIT_bytesize != expected_AIT_bytesize) ||
		    (byte_addr_diff0 != AIM_bytesize) ||
		    (byte_addr_diff1 <= AIT_bytesize))
			j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT);
	}

	if ((j_sb->s_flag & cpu_to_le32(JFS_GROUPCOMMIT)) !=
	    cpu_to_le32(JFS_GROUPCOMMIT))
		j_sb->s_flag |= cpu_to_le32(JFS_GROUPCOMMIT);

	/* validate fs state */
	if (j_sb->s_state != cpu_to_le32(FM_CLEAN) &&
	    !(sb->s_flags & MS_RDONLY)) {
		jfs_err("jfs_mount: Mount Failure: File System Dirty.");
		rc = -EINVAL;
		goto out;
	}

	sbi->state = le32_to_cpu(j_sb->s_state);
	sbi->mntflag = le32_to_cpu(j_sb->s_flag);

	/*
	 * JFS always does I/O by 4K pages.  Don't tell the buffer cache
	 * that we use anything else (leave s_blocksize alone).
	 */
	sbi->bsize = bsize;
	sbi->l2bsize = le16_to_cpu(j_sb->s_l2bsize);

	/*
	 * For now, ignore s_pbsize, l2bfactor.  All I/O going through buffer
	 * cache.
	 */
	sbi->nbperpage = PSIZE >> sbi->l2bsize;
	sbi->l2nbperpage = L2PSIZE - sbi->l2bsize;
	sbi->l2niperblk = sbi->l2bsize - L2DISIZE;
	if (sbi->mntflag & JFS_INLINELOG)
		sbi->logpxd = j_sb->s_logpxd;
	else {
		sbi->logdev = new_decode_dev(le32_to_cpu(j_sb->s_logdev));
		memcpy(sbi->uuid, j_sb->s_uuid, sizeof(sbi->uuid));
		memcpy(sbi->loguuid, j_sb->s_loguuid, sizeof(sbi->uuid));
	}
	sbi->fsckpxd = j_sb->s_fsckpxd;
	sbi->ait2 = j_sb->s_ait2;

      out:
	brelse(bh);
	return rc;
}


/*
 *	updateSuper()
 *
 * update synchronously superblock if it is mounted read-write.
 */
int updateSuper(struct super_block *sb, uint state)
{
	struct jfs_superblock *j_sb;
	struct jfs_sb_info *sbi = JFS_SBI(sb);
	struct buffer_head *bh;
	int rc;

	if (sbi->flag & JFS_NOINTEGRITY) {
		if (state == FM_DIRTY) {
			sbi->p_state = state;
			return 0;
		} else if (state == FM_MOUNT) {
			sbi->p_state = sbi->state;
			state = FM_DIRTY;
		} else if (state == FM_CLEAN) {
			state = sbi->p_state;
		} else
			jfs_err("updateSuper: bad state");
	} else if (sbi->state == FM_DIRTY)
		return 0;
	
	if ((rc = readSuper(sb, &bh)))
		return rc;

	j_sb = (struct jfs_superblock *)bh->b_data;

	j_sb->s_state = cpu_to_le32(state);
	sbi->state = state;

	if (state == FM_MOUNT) {
		/* record log's dev_t and mount serial number */
		j_sb->s_logdev = cpu_to_le32(new_encode_dev(sbi->log->bdev->bd_dev));
		j_sb->s_logserial = cpu_to_le32(sbi->log->serial);
	} else if (state == FM_CLEAN) {
		/*
		 * If this volume is shared with OS/2, OS/2 will need to
		 * recalculate DASD usage, since we don't deal with it.
		 */
		if (j_sb->s_flag & cpu_to_le32(JFS_DASD_ENABLED))
			j_sb->s_flag |= cpu_to_le32(JFS_DASD_PRIME);
	}

	mark_buffer_dirty(bh);
	sync_dirty_buffer(bh);
	brelse(bh);

	return 0;
}


/*
 *	readSuper()
 *
 * read superblock by raw sector address
 */
int readSuper(struct super_block *sb, struct buffer_head **bpp)
{
	/* read in primary superblock */
	*bpp = sb_bread(sb, SUPER1_OFF >> sb->s_blocksize_bits);
	if (*bpp)
		return 0;

	/* read in secondary/replicated superblock */
	*bpp = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits);
	if (*bpp)
		return 0;

	return -EIO;
}


/*
 *	logMOUNT()
 *
 * function: write a MOUNT log record for file system.
 *
 * MOUNT record keeps logredo() from processing log records
 * for this file system past this point in log.
 * it is harmless if mount fails.
 *
 * note: MOUNT record is at aggregate level, not at fileset level, 
 * since log records of previous mounts of a fileset
 * (e.g., AFTER record of extent allocation) have to be processed 
 * to update block allocation map at aggregate level.
 */
static int logMOUNT(struct super_block *sb)
{
	struct jfs_log *log = JFS_SBI(sb)->log;
	struct lrd lrd;

	lrd.logtid = 0;
	lrd.backchain = 0;
	lrd.type = cpu_to_le16(LOG_MOUNT);
	lrd.length = 0;
	lrd.aggregate = cpu_to_le32(new_encode_dev(sb->s_bdev->bd_dev));
	lmLog(log, NULL, &lrd, NULL);

	return 0;
}
OpenPOWER on IntegriCloud