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