xref: /openbmc/linux/fs/jfs/resize.c (revision dd0c0bdf)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *   Copyright (C) International Business Machines  Corp., 2000-2004
4 */
5 
6 #include <linux/fs.h>
7 #include <linux/buffer_head.h>
8 #include <linux/quotaops.h>
9 #include <linux/blkdev.h>
10 #include "jfs_incore.h"
11 #include "jfs_filsys.h"
12 #include "jfs_metapage.h"
13 #include "jfs_dinode.h"
14 #include "jfs_imap.h"
15 #include "jfs_dmap.h"
16 #include "jfs_superblock.h"
17 #include "jfs_txnmgr.h"
18 #include "jfs_debug.h"
19 
20 #define BITSPERPAGE	(PSIZE << 3)
21 #define L2MEGABYTE	20
22 #define MEGABYTE	(1 << L2MEGABYTE)
23 #define MEGABYTE32	(MEGABYTE << 5)
24 
25 /* convert block number to bmap file page number */
26 #define BLKTODMAPN(b)\
27 	(((b) >> 13) + ((b) >> 23) + ((b) >> 33) + 3 + 1)
28 
29 /*
30  *	jfs_extendfs()
31  *
32  * function: extend file system;
33  *
34  *   |-------------------------------|----------|----------|
35  *   file system space               fsck       inline log
36  *                                   workspace  space
37  *
38  * input:
39  *	new LVSize: in LV blocks (required)
40  *	new LogSize: in LV blocks (optional)
41  *	new FSSize: in LV blocks (optional)
42  *
43  * new configuration:
44  * 1. set new LogSize as specified or default from new LVSize;
45  * 2. compute new FSCKSize from new LVSize;
46  * 3. set new FSSize as MIN(FSSize, LVSize-(LogSize+FSCKSize)) where
47  *    assert(new FSSize >= old FSSize),
48  *    i.e., file system must not be shrunk;
49  */
jfs_extendfs(struct super_block * sb,s64 newLVSize,int newLogSize)50 int jfs_extendfs(struct super_block *sb, s64 newLVSize, int newLogSize)
51 {
52 	int rc = 0;
53 	struct jfs_sb_info *sbi = JFS_SBI(sb);
54 	struct inode *ipbmap = sbi->ipbmap;
55 	struct inode *ipbmap2;
56 	struct inode *ipimap = sbi->ipimap;
57 	struct jfs_log *log = sbi->log;
58 	struct bmap *bmp = sbi->bmap;
59 	s64 newLogAddress, newFSCKAddress;
60 	int newFSCKSize;
61 	s64 newMapSize = 0, mapSize;
62 	s64 XAddress, XSize, nblocks, xoff, xaddr, t64;
63 	s64 oldLVSize;
64 	s64 newFSSize;
65 	s64 VolumeSize;
66 	int newNpages = 0, nPages, newPage, xlen, t32;
67 	int tid;
68 	int log_formatted = 0;
69 	struct inode *iplist[1];
70 	struct jfs_superblock *j_sb, *j_sb2;
71 	s64 old_agsize;
72 	int agsizechanged = 0;
73 	struct buffer_head *bh, *bh2;
74 
75 	/* If the volume hasn't grown, get out now */
76 
77 	if (sbi->mntflag & JFS_INLINELOG)
78 		oldLVSize = addressPXD(&sbi->logpxd) + lengthPXD(&sbi->logpxd);
79 	else
80 		oldLVSize = addressPXD(&sbi->fsckpxd) +
81 		    lengthPXD(&sbi->fsckpxd);
82 
83 	if (oldLVSize >= newLVSize) {
84 		printk(KERN_WARNING
85 		       "jfs_extendfs: volume hasn't grown, returning\n");
86 		goto out;
87 	}
88 
89 	VolumeSize = sb_bdev_nr_blocks(sb);
90 	if (VolumeSize) {
91 		if (newLVSize > VolumeSize) {
92 			printk(KERN_WARNING "jfs_extendfs: invalid size\n");
93 			rc = -EINVAL;
94 			goto out;
95 		}
96 	} else {
97 		/* check the device */
98 		bh = sb_bread(sb, newLVSize - 1);
99 		if (!bh) {
100 			printk(KERN_WARNING "jfs_extendfs: invalid size\n");
101 			rc = -EINVAL;
102 			goto out;
103 		}
104 		bforget(bh);
105 	}
106 
107 	/* Can't extend write-protected drive */
108 
109 	if (isReadOnly(ipbmap)) {
110 		printk(KERN_WARNING "jfs_extendfs: read-only file system\n");
111 		rc = -EROFS;
112 		goto out;
113 	}
114 
115 	/*
116 	 *	reconfigure LV spaces
117 	 *	---------------------
118 	 *
119 	 * validate new size, or, if not specified, determine new size
120 	 */
121 
122 	/*
123 	 * reconfigure inline log space:
124 	 */
125 	if ((sbi->mntflag & JFS_INLINELOG)) {
126 		if (newLogSize == 0) {
127 			/*
128 			 * no size specified: default to 1/256 of aggregate
129 			 * size; rounded up to a megabyte boundary;
130 			 */
131 			newLogSize = newLVSize >> 8;
132 			t32 = (1 << (20 - sbi->l2bsize)) - 1;
133 			newLogSize = (newLogSize + t32) & ~t32;
134 			newLogSize =
135 			    min(newLogSize, MEGABYTE32 >> sbi->l2bsize);
136 		} else {
137 			/*
138 			 * convert the newLogSize to fs blocks.
139 			 *
140 			 * Since this is given in megabytes, it will always be
141 			 * an even number of pages.
142 			 */
143 			newLogSize = (newLogSize * MEGABYTE) >> sbi->l2bsize;
144 		}
145 
146 	} else
147 		newLogSize = 0;
148 
149 	newLogAddress = newLVSize - newLogSize;
150 
151 	/*
152 	 * reconfigure fsck work space:
153 	 *
154 	 * configure it to the end of the logical volume regardless of
155 	 * whether file system extends to the end of the aggregate;
156 	 * Need enough 4k pages to cover:
157 	 *  - 1 bit per block in aggregate rounded up to BPERDMAP boundary
158 	 *  - 1 extra page to handle control page and intermediate level pages
159 	 *  - 50 extra pages for the chkdsk service log
160 	 */
161 	t64 = ((newLVSize - newLogSize + BPERDMAP - 1) >> L2BPERDMAP)
162 	    << L2BPERDMAP;
163 	t32 = DIV_ROUND_UP(t64, BITSPERPAGE) + 1 + 50;
164 	newFSCKSize = t32 << sbi->l2nbperpage;
165 	newFSCKAddress = newLogAddress - newFSCKSize;
166 
167 	/*
168 	 * compute new file system space;
169 	 */
170 	newFSSize = newLVSize - newLogSize - newFSCKSize;
171 
172 	/* file system cannot be shrunk */
173 	if (newFSSize < bmp->db_mapsize) {
174 		rc = -EINVAL;
175 		goto out;
176 	}
177 
178 	/*
179 	 * If we're expanding enough that the inline log does not overlap
180 	 * the old one, we can format the new log before we quiesce the
181 	 * filesystem.
182 	 */
183 	if ((sbi->mntflag & JFS_INLINELOG) && (newLogAddress > oldLVSize)) {
184 		if ((rc = lmLogFormat(log, newLogAddress, newLogSize)))
185 			goto out;
186 		log_formatted = 1;
187 	}
188 	/*
189 	 *	quiesce file system
190 	 *
191 	 * (prepare to move the inline log and to prevent map update)
192 	 *
193 	 * block any new transactions and wait for completion of
194 	 * all wip transactions and flush modified pages s.t.
195 	 * on-disk file system is in consistent state and
196 	 * log is not required for recovery.
197 	 */
198 	txQuiesce(sb);
199 
200 	/* Reset size of direct inode */
201 	sbi->direct_inode->i_size = bdev_nr_bytes(sb->s_bdev);
202 
203 	if (sbi->mntflag & JFS_INLINELOG) {
204 		/*
205 		 * deactivate old inline log
206 		 */
207 		lmLogShutdown(log);
208 
209 		/*
210 		 * mark on-disk super block for fs in transition;
211 		 *
212 		 * update on-disk superblock for the new space configuration
213 		 * of inline log space and fsck work space descriptors:
214 		 * N.B. FS descriptor is NOT updated;
215 		 *
216 		 * crash recovery:
217 		 * logredo(): if FM_EXTENDFS, return to fsck() for cleanup;
218 		 * fsck(): if FM_EXTENDFS, reformat inline log and fsck
219 		 * workspace from superblock inline log descriptor and fsck
220 		 * workspace descriptor;
221 		 */
222 
223 		/* read in superblock */
224 		if ((rc = readSuper(sb, &bh)))
225 			goto error_out;
226 		j_sb = (struct jfs_superblock *)bh->b_data;
227 
228 		/* mark extendfs() in progress */
229 		j_sb->s_state |= cpu_to_le32(FM_EXTENDFS);
230 		j_sb->s_xsize = cpu_to_le64(newFSSize);
231 		PXDaddress(&j_sb->s_xfsckpxd, newFSCKAddress);
232 		PXDlength(&j_sb->s_xfsckpxd, newFSCKSize);
233 		PXDaddress(&j_sb->s_xlogpxd, newLogAddress);
234 		PXDlength(&j_sb->s_xlogpxd, newLogSize);
235 
236 		/* synchronously update superblock */
237 		mark_buffer_dirty(bh);
238 		sync_dirty_buffer(bh);
239 		brelse(bh);
240 
241 		/*
242 		 * format new inline log synchronously;
243 		 *
244 		 * crash recovery: if log move in progress,
245 		 * reformat log and exit success;
246 		 */
247 		if (!log_formatted)
248 			if ((rc = lmLogFormat(log, newLogAddress, newLogSize)))
249 				goto error_out;
250 
251 		/*
252 		 * activate new log
253 		 */
254 		log->base = newLogAddress;
255 		log->size = newLogSize >> (L2LOGPSIZE - sb->s_blocksize_bits);
256 		if ((rc = lmLogInit(log)))
257 			goto error_out;
258 	}
259 
260 	/*
261 	 *	extend block allocation map
262 	 *	---------------------------
263 	 *
264 	 * extendfs() for new extension, retry after crash recovery;
265 	 *
266 	 * note: both logredo() and fsck() rebuild map from
267 	 * the bitmap and configuration parameter from superblock
268 	 * (disregarding all other control information in the map);
269 	 *
270 	 * superblock:
271 	 *  s_size: aggregate size in physical blocks;
272 	 */
273 	/*
274 	 *	compute the new block allocation map configuration
275 	 *
276 	 * map dinode:
277 	 *  di_size: map file size in byte;
278 	 *  di_nblocks: number of blocks allocated for map file;
279 	 *  di_mapsize: number of blocks in aggregate (covered by map);
280 	 * map control page:
281 	 *  db_mapsize: number of blocks in aggregate (covered by map);
282 	 */
283 	newMapSize = newFSSize;
284 	/* number of data pages of new bmap file:
285 	 * roundup new size to full dmap page boundary and
286 	 * add 1 extra dmap page for next extendfs()
287 	 */
288 	t64 = (newMapSize - 1) + BPERDMAP;
289 	newNpages = BLKTODMAPN(t64) + 1;
290 
291 	/*
292 	 *	extend map from current map (WITHOUT growing mapfile)
293 	 *
294 	 * map new extension with unmapped part of the last partial
295 	 * dmap page, if applicable, and extra page(s) allocated
296 	 * at end of bmap by mkfs() or previous extendfs();
297 	 */
298       extendBmap:
299 	/* compute number of blocks requested to extend */
300 	mapSize = bmp->db_mapsize;
301 	XAddress = mapSize;	/* eXtension Address */
302 	XSize = newMapSize - mapSize;	/* eXtension Size */
303 	old_agsize = bmp->db_agsize;	/* We need to know if this changes */
304 
305 	/* compute number of blocks that can be extended by current mapfile */
306 	t64 = dbMapFileSizeToMapSize(ipbmap);
307 	if (mapSize > t64) {
308 		printk(KERN_ERR "jfs_extendfs: mapSize (0x%Lx) > t64 (0x%Lx)\n",
309 		       (long long) mapSize, (long long) t64);
310 		rc = -EIO;
311 		goto error_out;
312 	}
313 	nblocks = min(t64 - mapSize, XSize);
314 
315 	/*
316 	 * update map pages for new extension:
317 	 *
318 	 * update/init dmap and bubble up the control hierarchy
319 	 * incrementally fold up dmaps into upper levels;
320 	 * update bmap control page;
321 	 */
322 	if ((rc = dbExtendFS(ipbmap, XAddress, nblocks)))
323 		goto error_out;
324 
325 	agsizechanged |= (bmp->db_agsize != old_agsize);
326 
327 	/*
328 	 * the map now has extended to cover additional nblocks:
329 	 * dn_mapsize = oldMapsize + nblocks;
330 	 */
331 	/* ipbmap->i_mapsize += nblocks; */
332 	XSize -= nblocks;
333 
334 	/*
335 	 *	grow map file to cover remaining extension
336 	 *	and/or one extra dmap page for next extendfs();
337 	 *
338 	 * allocate new map pages and its backing blocks, and
339 	 * update map file xtree
340 	 */
341 	/* compute number of data pages of current bmap file */
342 	nPages = ipbmap->i_size >> L2PSIZE;
343 
344 	/* need to grow map file ? */
345 	if (nPages == newNpages)
346 		goto finalizeBmap;
347 
348 	/*
349 	 * grow bmap file for the new map pages required:
350 	 *
351 	 * allocate growth at the start of newly extended region;
352 	 * bmap file only grows sequentially, i.e., both data pages
353 	 * and possibly xtree index pages may grow in append mode,
354 	 * s.t. logredo() can reconstruct pre-extension state
355 	 * by washing away bmap file of pages outside s_size boundary;
356 	 */
357 	/*
358 	 * journal map file growth as if a regular file growth:
359 	 * (note: bmap is created with di_mode = IFJOURNAL|IFREG);
360 	 *
361 	 * journaling of bmap file growth is not required since
362 	 * logredo() do/can not use log records of bmap file growth
363 	 * but it provides careful write semantics, pmap update, etc.;
364 	 */
365 	/* synchronous write of data pages: bmap data pages are
366 	 * cached in meta-data cache, and not written out
367 	 * by txCommit();
368 	 */
369 	rc = filemap_fdatawait(ipbmap->i_mapping);
370 	if (rc)
371 		goto error_out;
372 
373 	rc = filemap_write_and_wait(ipbmap->i_mapping);
374 	if (rc)
375 		goto error_out;
376 
377 	diWriteSpecial(ipbmap, 0);
378 
379 	newPage = nPages;	/* first new page number */
380 	xoff = newPage << sbi->l2nbperpage;
381 	xlen = (newNpages - nPages) << sbi->l2nbperpage;
382 	xlen = min(xlen, (int) nblocks) & ~(sbi->nbperpage - 1);
383 	xaddr = XAddress;
384 
385 	tid = txBegin(sb, COMMIT_FORCE);
386 
387 	if ((rc = xtAppend(tid, ipbmap, 0, xoff, nblocks, &xlen, &xaddr, 0))) {
388 		txEnd(tid);
389 		goto error_out;
390 	}
391 	/* update bmap file size */
392 	ipbmap->i_size += xlen << sbi->l2bsize;
393 	inode_add_bytes(ipbmap, xlen << sbi->l2bsize);
394 
395 	iplist[0] = ipbmap;
396 	rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
397 
398 	txEnd(tid);
399 
400 	if (rc)
401 		goto error_out;
402 
403 	/*
404 	 * map file has been grown now to cover extension to further out;
405 	 * di_size = new map file size;
406 	 *
407 	 * if huge extension, the previous extension based on previous
408 	 * map file size may not have been sufficient to cover whole extension
409 	 * (it could have been used up for new map pages),
410 	 * but the newly grown map file now covers lot bigger new free space
411 	 * available for further extension of map;
412 	 */
413 	/* any more blocks to extend ? */
414 	if (XSize)
415 		goto extendBmap;
416 
417       finalizeBmap:
418 	/* finalize bmap */
419 	dbFinalizeBmap(ipbmap);
420 
421 	/*
422 	 *	update inode allocation map
423 	 *	---------------------------
424 	 *
425 	 * move iag lists from old to new iag;
426 	 * agstart field is not updated for logredo() to reconstruct
427 	 * iag lists if system crash occurs.
428 	 * (computation of ag number from agstart based on agsize
429 	 * will correctly identify the new ag);
430 	 */
431 	/* if new AG size the same as old AG size, done! */
432 	if (agsizechanged) {
433 		if ((rc = diExtendFS(ipimap, ipbmap)))
434 			goto error_out;
435 
436 		/* finalize imap */
437 		if ((rc = diSync(ipimap)))
438 			goto error_out;
439 	}
440 
441 	/*
442 	 *	finalize
443 	 *	--------
444 	 *
445 	 * extension is committed when on-disk super block is
446 	 * updated with new descriptors: logredo will recover
447 	 * crash before it to pre-extension state;
448 	 */
449 
450 	/* sync log to skip log replay of bmap file growth transaction; */
451 	/* lmLogSync(log, 1); */
452 
453 	/*
454 	 * synchronous write bmap global control page;
455 	 * for crash before completion of write
456 	 * logredo() will recover to pre-extendfs state;
457 	 * for crash after completion of write,
458 	 * logredo() will recover post-extendfs state;
459 	 */
460 	if ((rc = dbSync(ipbmap)))
461 		goto error_out;
462 
463 	/*
464 	 * copy primary bmap inode to secondary bmap inode
465 	 */
466 
467 	ipbmap2 = diReadSpecial(sb, BMAP_I, 1);
468 	if (ipbmap2 == NULL) {
469 		printk(KERN_ERR "jfs_extendfs: diReadSpecial(bmap) failed\n");
470 		goto error_out;
471 	}
472 	memcpy(&JFS_IP(ipbmap2)->i_xtroot, &JFS_IP(ipbmap)->i_xtroot, 288);
473 	ipbmap2->i_size = ipbmap->i_size;
474 	ipbmap2->i_blocks = ipbmap->i_blocks;
475 
476 	diWriteSpecial(ipbmap2, 1);
477 	diFreeSpecial(ipbmap2);
478 
479 	/*
480 	 *	update superblock
481 	 */
482 	if ((rc = readSuper(sb, &bh)))
483 		goto error_out;
484 	j_sb = (struct jfs_superblock *)bh->b_data;
485 
486 	/* mark extendfs() completion */
487 	j_sb->s_state &= cpu_to_le32(~FM_EXTENDFS);
488 	j_sb->s_size = cpu_to_le64(bmp->db_mapsize <<
489 				   le16_to_cpu(j_sb->s_l2bfactor));
490 	j_sb->s_agsize = cpu_to_le32(bmp->db_agsize);
491 
492 	/* update inline log space descriptor */
493 	if (sbi->mntflag & JFS_INLINELOG) {
494 		PXDaddress(&(j_sb->s_logpxd), newLogAddress);
495 		PXDlength(&(j_sb->s_logpxd), newLogSize);
496 	}
497 
498 	/* record log's mount serial number */
499 	j_sb->s_logserial = cpu_to_le32(log->serial);
500 
501 	/* update fsck work space descriptor */
502 	PXDaddress(&(j_sb->s_fsckpxd), newFSCKAddress);
503 	PXDlength(&(j_sb->s_fsckpxd), newFSCKSize);
504 	j_sb->s_fscklog = 1;
505 	/* sb->s_fsckloglen remains the same */
506 
507 	/* Update secondary superblock */
508 	bh2 = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits);
509 	if (bh2) {
510 		j_sb2 = (struct jfs_superblock *)bh2->b_data;
511 		memcpy(j_sb2, j_sb, sizeof (struct jfs_superblock));
512 
513 		mark_buffer_dirty(bh);
514 		sync_dirty_buffer(bh2);
515 		brelse(bh2);
516 	}
517 
518 	/* write primary superblock */
519 	mark_buffer_dirty(bh);
520 	sync_dirty_buffer(bh);
521 	brelse(bh);
522 
523 	goto resume;
524 
525       error_out:
526 	jfs_error(sb, "\n");
527 
528       resume:
529 	/*
530 	 *	resume file system transactions
531 	 */
532 	txResume(sb);
533 
534       out:
535 	return rc;
536 }
537