1/*
2 *   Copyright (C) International Business Machines  Corp., 2000-2004
3 *
4 *   This program is free software;  you can redistribute it and/or modify
5 *   it under the terms of the GNU General Public License as published by
6 *   the Free Software Foundation; either version 2 of the License, or
7 *   (at your option) any later version.
8 *
9 *   This program is distributed in the hope that it will be useful,
10 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
11 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
12 *   the GNU General Public License for more details.
13 *
14 *   You should have received a copy of the GNU General Public License
15 *   along with this program;  if not, write to the Free Software
16 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17*/
18
19#include <linux/fs.h>
20#include <linux/buffer_head.h>
21#include <linux/quotaops.h>
22#include "jfs_incore.h"
23#include "jfs_filsys.h"
24#include "jfs_metapage.h"
25#include "jfs_dinode.h"
26#include "jfs_imap.h"
27#include "jfs_dmap.h"
28#include "jfs_superblock.h"
29#include "jfs_txnmgr.h"
30#include "jfs_debug.h"
31
32#define BITSPERPAGE     (PSIZE << 3)
33#define L2MEGABYTE      20
34#define MEGABYTE        (1 << L2MEGABYTE)
35#define MEGABYTE32     (MEGABYTE << 5)
36
37/* convert block number to bmap file page number */
38#define BLKTODMAPN(b)\
39        (((b) >> 13) + ((b) >> 23) + ((b) >> 33) + 3 + 1)
40
41/*
42 *      jfs_extendfs()
43 *
44 * function: extend file system;
45 *
46 *   |-------------------------------|----------|----------|
47 *   file system space               fsck       inline log
48 *                                   workspace  space
49 *
50 * input:
51 *      new LVSize: in LV blocks (required)
52 *      new LogSize: in LV blocks (optional)
53 *      new FSSize: in LV blocks (optional)
54 *
55 * new configuration:
56 * 1. set new LogSize as specified or default from new LVSize;
57 * 2. compute new FSCKSize from new LVSize;
58 * 3. set new FSSize as MIN(FSSize, LVSize-(LogSize+FSCKSize)) where
59 *    assert(new FSSize >= old FSSize),
60 *    i.e., file system must not be shrinked;
61 */
62int jfs_extendfs(struct super_block *sb, s64 newLVSize, int newLogSize)
63{
64	int rc = 0;
65	struct jfs_sb_info *sbi = JFS_SBI(sb);
66	struct inode *ipbmap = sbi->ipbmap;
67	struct inode *ipbmap2;
68	struct inode *ipimap = sbi->ipimap;
69	struct jfs_log *log = sbi->log;
70	struct bmap *bmp = sbi->bmap;
71	s64 newLogAddress, newFSCKAddress;
72	int newFSCKSize;
73	s64 newMapSize = 0, mapSize;
74	s64 XAddress, XSize, nblocks, xoff, xaddr, t64;
75	s64 oldLVSize;
76	s64 newFSSize;
77	s64 VolumeSize;
78	int newNpages = 0, nPages, newPage, xlen, t32;
79	int tid;
80	int log_formatted = 0;
81	struct inode *iplist[1];
82	struct jfs_superblock *j_sb, *j_sb2;
83	uint old_agsize;
84	struct buffer_head *bh, *bh2;
85
86	/* If the volume hasn't grown, get out now */
87
88	if (sbi->mntflag & JFS_INLINELOG)
89		oldLVSize = addressPXD(&sbi->logpxd) + lengthPXD(&sbi->logpxd);
90	else
91		oldLVSize = addressPXD(&sbi->fsckpxd) +
92		    lengthPXD(&sbi->fsckpxd);
93
94	if (oldLVSize >= newLVSize) {
95		printk(KERN_WARNING
96		       "jfs_extendfs: volume hasn't grown, returning\n");
97		goto out;
98	}
99
100	VolumeSize = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
101
102	if (VolumeSize) {
103		if (newLVSize > VolumeSize) {
104			printk(KERN_WARNING "jfs_extendfs: invalid size\n");
105			rc = -EINVAL;
106			goto out;
107		}
108	} else {
109		/* check the device */
110		bh = sb_bread(sb, newLVSize - 1);
111		if (!bh) {
112			printk(KERN_WARNING "jfs_extendfs: invalid size\n");
113			rc = -EINVAL;
114			goto out;
115		}
116		bforget(bh);
117	}
118
119	/* Can't extend write-protected drive */
120
121	if (isReadOnly(ipbmap)) {
122		printk(KERN_WARNING "jfs_extendfs: read-only file system\n");
123		rc = -EROFS;
124		goto out;
125	}
126
127	/*
128	 *      reconfigure LV spaces
129	 *      ---------------------
130	 *
131	 * validate new size, or, if not specified, determine new size
132	 */
133
134	/*
135	 * reconfigure inline log space:
136	 */
137	if ((sbi->mntflag & JFS_INLINELOG)) {
138		if (newLogSize == 0) {
139			/*
140			 * no size specified: default to 1/256 of aggregate
141			 * size; rounded up to a megabyte boundary;
142			 */
143			newLogSize = newLVSize >> 8;
144			t32 = (1 << (20 - sbi->l2bsize)) - 1;
145			newLogSize = (newLogSize + t32) & ~t32;
146			newLogSize =
147			    min(newLogSize, MEGABYTE32 >> sbi->l2bsize);
148		} else {
149			/*
150			 * convert the newLogSize to fs blocks.
151			 *
152			 * Since this is given in megabytes, it will always be
153			 * an even number of pages.
154			 */
155			newLogSize = (newLogSize * MEGABYTE) >> sbi->l2bsize;
156		}
157
158	} else
159		newLogSize = 0;
160
161	newLogAddress = newLVSize - newLogSize;
162
163	/*
164	 * reconfigure fsck work space:
165	 *
166	 * configure it to the end of the logical volume regardless of
167	 * whether file system extends to the end of the aggregate;
168	 * Need enough 4k pages to cover:
169	 *  - 1 bit per block in aggregate rounded up to BPERDMAP boundary
170	 *  - 1 extra page to handle control page and intermediate level pages
171	 *  - 50 extra pages for the chkdsk service log
172	 */
173	t64 = ((newLVSize - newLogSize + BPERDMAP - 1) >> L2BPERDMAP)
174	    << L2BPERDMAP;
175	t32 = ((t64 + (BITSPERPAGE - 1)) / BITSPERPAGE) + 1 + 50;
176	newFSCKSize = t32 << sbi->l2nbperpage;
177	newFSCKAddress = newLogAddress - newFSCKSize;
178
179	/*
180	 * compute new file system space;
181	 */
182	newFSSize = newLVSize - newLogSize - newFSCKSize;
183
184	/* file system cannot be shrinked */
185	if (newFSSize < bmp->db_mapsize) {
186		rc = -EINVAL;
187		goto out;
188	}
189
190	/*
191	 * If we're expanding enough that the inline log does not overlap
192	 * the old one, we can format the new log before we quiesce the
193	 * filesystem.
194	 */
195	if ((sbi->mntflag & JFS_INLINELOG) && (newLogAddress > oldLVSize)) {
196		if ((rc = lmLogFormat(log, newLogAddress, newLogSize)))
197			goto out;
198		log_formatted = 1;
199	}
200	/*
201	 *      quiesce file system
202	 *
203	 * (prepare to move the inline log and to prevent map update)
204	 *
205	 * block any new transactions and wait for completion of
206	 * all wip transactions and flush modified pages s.t.
207	 * on-disk file system is in consistent state and
208	 * log is not required for recovery.
209	 */
210	txQuiesce(sb);
211
212	/* Reset size of direct inode */
213	sbi->direct_inode->i_size =  sb->s_bdev->bd_inode->i_size;
214
215	if (sbi->mntflag & JFS_INLINELOG) {
216		/*
217		 * deactivate old inline log
218		 */
219		lmLogShutdown(log);
220
221		/*
222		 * mark on-disk super block for fs in transition;
223		 *
224		 * update on-disk superblock for the new space configuration
225		 * of inline log space and fsck work space descriptors:
226		 * N.B. FS descriptor is NOT updated;
227		 *
228		 * crash recovery:
229		 * logredo(): if FM_EXTENDFS, return to fsck() for cleanup;
230		 * fsck(): if FM_EXTENDFS, reformat inline log and fsck
231		 * workspace from superblock inline log descriptor and fsck
232		 * workspace descriptor;
233		 */
234
235		/* read in superblock */
236		if ((rc = readSuper(sb, &bh)))
237			goto error_out;
238		j_sb = (struct jfs_superblock *)bh->b_data;
239
240		/* mark extendfs() in progress */
241		j_sb->s_state |= cpu_to_le32(FM_EXTENDFS);
242		j_sb->s_xsize = cpu_to_le64(newFSSize);
243		PXDaddress(&j_sb->s_xfsckpxd, newFSCKAddress);
244		PXDlength(&j_sb->s_xfsckpxd, newFSCKSize);
245		PXDaddress(&j_sb->s_xlogpxd, newLogAddress);
246		PXDlength(&j_sb->s_xlogpxd, newLogSize);
247
248		/* synchronously update superblock */
249		mark_buffer_dirty(bh);
250		sync_dirty_buffer(bh);
251		brelse(bh);
252
253		/*
254		 * format new inline log synchronously;
255		 *
256		 * crash recovery: if log move in progress,
257		 * reformat log and exit success;
258		 */
259		if (!log_formatted)
260			if ((rc = lmLogFormat(log, newLogAddress, newLogSize)))
261				goto error_out;
262
263		/*
264		 * activate new log
265		 */
266		log->base = newLogAddress;
267		log->size = newLogSize >> (L2LOGPSIZE - sb->s_blocksize_bits);
268		if ((rc = lmLogInit(log)))
269			goto error_out;
270	}
271
272	/*
273	 *      extend block allocation map
274	 *      ---------------------------
275	 *
276	 * extendfs() for new extension, retry after crash recovery;
277	 *
278	 * note: both logredo() and fsck() rebuild map from
279	 * the bitmap and configuration parameter from superblock
280	 * (disregarding all other control information in the map);
281	 *
282	 * superblock:
283	 *  s_size: aggregate size in physical blocks;
284	 */
285	/*
286	 *      compute the new block allocation map configuration
287	 *
288	 * map dinode:
289	 *  di_size: map file size in byte;
290	 *  di_nblocks: number of blocks allocated for map file;
291	 *  di_mapsize: number of blocks in aggregate (covered by map);
292	 * map control page:
293	 *  db_mapsize: number of blocks in aggregate (covered by map);
294	 */
295	newMapSize = newFSSize;
296	/* number of data pages of new bmap file:
297	 * roundup new size to full dmap page boundary and
298	 * add 1 extra dmap page for next extendfs()
299	 */
300	t64 = (newMapSize - 1) + BPERDMAP;
301	newNpages = BLKTODMAPN(t64) + 1;
302
303	/*
304	 *      extend map from current map (WITHOUT growing mapfile)
305	 *
306	 * map new extension with unmapped part of the last partial
307	 * dmap page, if applicable, and extra page(s) allocated
308	 * at end of bmap by mkfs() or previous extendfs();
309	 */
310      extendBmap:
311	/* compute number of blocks requested to extend */
312	mapSize = bmp->db_mapsize;
313	XAddress = mapSize;	/* eXtension Address */
314	XSize = newMapSize - mapSize;	/* eXtension Size */
315	old_agsize = bmp->db_agsize;	/* We need to know if this changes */
316
317	/* compute number of blocks that can be extended by current mapfile */
318	t64 = dbMapFileSizeToMapSize(ipbmap);
319	if (mapSize > t64) {
320		printk(KERN_ERR "jfs_extendfs: mapSize (0x%Lx) > t64 (0x%Lx)\n",
321		       (long long) mapSize, (long long) t64);
322		rc = -EIO;
323		goto error_out;
324	}
325	nblocks = min(t64 - mapSize, XSize);
326
327	/*
328	 * update map pages for new extension:
329	 *
330	 * update/init dmap and bubble up the control hierarchy
331	 * incrementally fold up dmaps into upper levels;
332	 * update bmap control page;
333	 */
334	if ((rc = dbExtendFS(ipbmap, XAddress, nblocks)))
335		goto error_out;
336	/*
337	 * the map now has extended to cover additional nblocks:
338	 * dn_mapsize = oldMapsize + nblocks;
339	 */
340	/* ipbmap->i_mapsize += nblocks; */
341	XSize -= nblocks;
342
343	/*
344	 *      grow map file to cover remaining extension
345	 *      and/or one extra dmap page for next extendfs();
346	 *
347	 * allocate new map pages and its backing blocks, and
348	 * update map file xtree
349	 */
350	/* compute number of data pages of current bmap file */
351	nPages = ipbmap->i_size >> L2PSIZE;
352
353	/* need to grow map file ? */
354	if (nPages == newNpages)
355		goto finalizeBmap;
356
357	/*
358	 * grow bmap file for the new map pages required:
359	 *
360	 * allocate growth at the start of newly extended region;
361	 * bmap file only grows sequentially, i.e., both data pages
362	 * and possibly xtree index pages may grow in append mode,
363	 * s.t. logredo() can reconstruct pre-extension state
364	 * by washing away bmap file of pages outside s_size boundary;
365	 */
366	/*
367	 * journal map file growth as if a regular file growth:
368	 * (note: bmap is created with di_mode = IFJOURNAL|IFREG);
369	 *
370	 * journaling of bmap file growth is not required since
371	 * logredo() do/can not use log records of bmap file growth
372	 * but it provides careful write semantics, pmap update, etc.;
373	 */
374	/* synchronous write of data pages: bmap data pages are
375	 * cached in meta-data cache, and not written out
376	 * by txCommit();
377	 */
378	filemap_fdatawait(ipbmap->i_mapping);
379	filemap_write_and_wait(ipbmap->i_mapping);
380	diWriteSpecial(ipbmap, 0);
381
382	newPage = nPages;	/* first new page number */
383	xoff = newPage << sbi->l2nbperpage;
384	xlen = (newNpages - nPages) << sbi->l2nbperpage;
385	xlen = min(xlen, (int) nblocks) & ~(sbi->nbperpage - 1);
386	xaddr = XAddress;
387
388	tid = txBegin(sb, COMMIT_FORCE);
389
390	if ((rc = xtAppend(tid, ipbmap, 0, xoff, nblocks, &xlen, &xaddr, 0))) {
391		txEnd(tid);
392		goto error_out;
393	}
394	/* update bmap file size */
395	ipbmap->i_size += xlen << sbi->l2bsize;
396	inode_add_bytes(ipbmap, xlen << sbi->l2bsize);
397
398	iplist[0] = ipbmap;
399	rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
400
401	txEnd(tid);
402
403	if (rc)
404		goto error_out;
405
406	/*
407	 * map file has been grown now to cover extension to further out;
408	 * di_size = new map file size;
409	 *
410	 * if huge extension, the previous extension based on previous
411	 * map file size may not have been sufficient to cover whole extension
412	 * (it could have been used up for new map pages),
413	 * but the newly grown map file now covers lot bigger new free space
414	 * available for further extension of map;
415	 */
416	/* any more blocks to extend ? */
417	if (XSize)
418		goto extendBmap;
419
420      finalizeBmap:
421	/* finalize bmap */
422	dbFinalizeBmap(ipbmap);
423
424	/*
425	 *      update inode allocation map
426	 *      ---------------------------
427	 *
428	 * move iag lists from old to new iag;
429	 * agstart field is not updated for logredo() to reconstruct
430	 * iag lists if system crash occurs.
431	 * (computation of ag number from agstart based on agsize
432	 * will correctly identify the new ag);
433	 */
434	/* if new AG size the same as old AG size, done! */
435	if (bmp->db_agsize != old_agsize) {
436		if ((rc = diExtendFS(ipimap, ipbmap)))
437			goto error_out;
438
439		/* finalize imap */
440		if ((rc = diSync(ipimap)))
441			goto error_out;
442	}
443
444	/*
445	 *      finalize
446	 *      --------
447	 *
448	 * extension is committed when on-disk super block is
449	 * updated with new descriptors: logredo will recover
450	 * crash before it to pre-extension state;
451	 */
452
453	/* sync log to skip log replay of bmap file growth transaction; */
454	/* lmLogSync(log, 1); */
455
456	/*
457	 * synchronous write bmap global control page;
458	 * for crash before completion of write
459	 * logredo() will recover to pre-extendfs state;
460	 * for crash after completion of write,
461	 * logredo() will recover post-extendfs state;
462	 */
463	if ((rc = dbSync(ipbmap)))
464		goto error_out;
465
466	/*
467	 * copy primary bmap inode to secondary bmap inode
468	 */
469
470	ipbmap2 = diReadSpecial(sb, BMAP_I, 1);
471	if (ipbmap2 == NULL) {
472		printk(KERN_ERR "jfs_extendfs: diReadSpecial(bmap) failed\n");
473		goto error_out;
474	}
475	memcpy(&JFS_IP(ipbmap2)->i_xtroot, &JFS_IP(ipbmap)->i_xtroot, 288);
476	ipbmap2->i_size = ipbmap->i_size;
477	ipbmap2->i_blocks = ipbmap->i_blocks;
478
479	diWriteSpecial(ipbmap2, 1);
480	diFreeSpecial(ipbmap2);
481
482	/*
483	 *      update superblock
484	 */
485	if ((rc = readSuper(sb, &bh)))
486		goto error_out;
487	j_sb = (struct jfs_superblock *)bh->b_data;
488
489	/* mark extendfs() completion */
490	j_sb->s_state &= cpu_to_le32(~FM_EXTENDFS);
491	j_sb->s_size = cpu_to_le64(bmp->db_mapsize <<
492				   le16_to_cpu(j_sb->s_l2bfactor));
493	j_sb->s_agsize = cpu_to_le32(bmp->db_agsize);
494
495	/* update inline log space descriptor */
496	if (sbi->mntflag & JFS_INLINELOG) {
497		PXDaddress(&(j_sb->s_logpxd), newLogAddress);
498		PXDlength(&(j_sb->s_logpxd), newLogSize);
499	}
500
501	/* record log's mount serial number */
502	j_sb->s_logserial = cpu_to_le32(log->serial);
503
504	/* update fsck work space descriptor */
505	PXDaddress(&(j_sb->s_fsckpxd), newFSCKAddress);
506	PXDlength(&(j_sb->s_fsckpxd), newFSCKSize);
507	j_sb->s_fscklog = 1;
508	/* sb->s_fsckloglen remains the same */
509
510	/* Update secondary superblock */
511	bh2 = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits);
512	if (bh2) {
513		j_sb2 = (struct jfs_superblock *)bh2->b_data;
514		memcpy(j_sb2, j_sb, sizeof (struct jfs_superblock));
515
516		mark_buffer_dirty(bh);
517		sync_dirty_buffer(bh2);
518		brelse(bh2);
519	}
520
521	/* write primary superblock */
522	mark_buffer_dirty(bh);
523	sync_dirty_buffer(bh);
524	brelse(bh);
525
526	goto resume;
527
528      error_out:
529	jfs_error(sb, "jfs_extendfs");
530
531      resume:
532	/*
533	 *      resume file system transactions
534	 */
535	txResume(sb);
536
537      out:
538	return rc;
539}
540