fs/jfs/resize.c

   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 shrunk;
  61  */
  62 int 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         s64 old_agsize;
  84         int agsizechanged = 0;
  85         struct buffer_head *bh, *bh2;
  86
  87         /* If the volume hasn't grown, get out now */
  88
  89         if (sbi->mntflag & JFS_INLINELOG)
  90                 oldLVSize = addressPXD(&sbi->logpxd) + lengthPXD(&sbi->logpxd);
  91         else
  92                 oldLVSize = addressPXD(&sbi->fsckpxd) +
  93                     lengthPXD(&sbi->fsckpxd);
  94
  95         if (oldLVSize >= newLVSize) {
  96                 printk(KERN_WARNING
  97                        "jfs_extendfs: volume hasn't grown, returning\n");
  98                 goto out;
  99         }
 100
 101         VolumeSize = i_size_read(sb->s_bdev->bd_inode) >> sb->s_blocksize_bits;
 102
 103         if (VolumeSize) {
 104                 if (newLVSize > VolumeSize) {
 105                         printk(KERN_WARNING "jfs_extendfs: invalid size\n");
 106                         rc = -EINVAL;
 107                         goto out;
 108                 }
 109         } else {
 110                 /* check the device */
 111                 bh = sb_bread(sb, newLVSize - 1);
 112                 if (!bh) {
 113                         printk(KERN_WARNING "jfs_extendfs: invalid size\n");
 114                         rc = -EINVAL;
 115                         goto out;
 116                 }
 117                 bforget(bh);
 118         }
 119
 120         /* Can't extend write-protected drive */
 121
 122         if (isReadOnly(ipbmap)) {
 123                 printk(KERN_WARNING "jfs_extendfs: read-only file system\n");
 124                 rc = -EROFS;
 125                 goto out;
 126         }
 127
 128         /*
 129          *      reconfigure LV spaces
 130          *      ---------------------
 131          *
 132          * validate new size, or, if not specified, determine new size
 133          */
 134
 135         /*
 136          * reconfigure inline log space:
 137          */
 138         if ((sbi->mntflag & JFS_INLINELOG)) {
 139                 if (newLogSize == 0) {
 140                         /*
 141                          * no size specified: default to 1/256 of aggregate
 142                          * size; rounded up to a megabyte boundary;
 143                          */
 144                         newLogSize = newLVSize >> 8;
 145                         t32 = (1 << (20 - sbi->l2bsize)) - 1;
 146                         newLogSize = (newLogSize + t32) & ~t32;
 147                         newLogSize =
 148                             min(newLogSize, MEGABYTE32 >> sbi->l2bsize);
 149                 } else {
 150                         /*
 151                          * convert the newLogSize to fs blocks.
 152                          *
 153                          * Since this is given in megabytes, it will always be
 154                          * an even number of pages.
 155                          */
 156                         newLogSize = (newLogSize * MEGABYTE) >> sbi->l2bsize;
 157                 }
 158
 159         } else
 160                 newLogSize = 0;
 161
 162         newLogAddress = newLVSize - newLogSize;
 163
 164         /*
 165          * reconfigure fsck work space:
 166          *
 167          * configure it to the end of the logical volume regardless of
 168          * whether file system extends to the end of the aggregate;
 169          * Need enough 4k pages to cover:
 170          *  - 1 bit per block in aggregate rounded up to BPERDMAP boundary
 171          *  - 1 extra page to handle control page and intermediate level pages
 172          *  - 50 extra pages for the chkdsk service log
 173          */
 174         t64 = ((newLVSize - newLogSize + BPERDMAP - 1) >> L2BPERDMAP)
 175             << L2BPERDMAP;
 176         t32 = DIV_ROUND_UP(t64, BITSPERPAGE) + 1 + 50;
 177         newFSCKSize = t32 << sbi->l2nbperpage;
 178         newFSCKAddress = newLogAddress - newFSCKSize;
 179
 180         /*
 181          * compute new file system space;
 182          */
 183         newFSSize = newLVSize - newLogSize - newFSCKSize;
 184
 185         /* file system cannot be shrunk */
 186         if (newFSSize < bmp->db_mapsize) {
 187                 rc = -EINVAL;
 188                 goto out;
 189         }
 190
 191         /*
 192          * If we're expanding enough that the inline log does not overlap
 193          * the old one, we can format the new log before we quiesce the
 194          * filesystem.
 195          */
 196         if ((sbi->mntflag & JFS_INLINELOG) && (newLogAddress > oldLVSize)) {
 197                 if ((rc = lmLogFormat(log, newLogAddress, newLogSize)))
 198                         goto out;
 199                 log_formatted = 1;
 200         }
 201         /*
 202          *      quiesce file system
 203          *
 204          * (prepare to move the inline log and to prevent map update)
 205          *
 206          * block any new transactions and wait for completion of
 207          * all wip transactions and flush modified pages s.t.
 208          * on-disk file system is in consistent state and
 209          * log is not required for recovery.
 210          */
 211         txQuiesce(sb);
 212
 213         /* Reset size of direct inode */
 214         sbi->direct_inode->i_size =  i_size_read(sb->s_bdev->bd_inode);
 215
 216         if (sbi->mntflag & JFS_INLINELOG) {
 217                 /*
 218                  * deactivate old inline log
 219                  */
 220                 lmLogShutdown(log);
 221
 222                 /*
 223                  * mark on-disk super block for fs in transition;
 224                  *
 225                  * update on-disk superblock for the new space configuration
 226                  * of inline log space and fsck work space descriptors:
 227                  * N.B. FS descriptor is NOT updated;
 228                  *
 229                  * crash recovery:
 230                  * logredo(): if FM_EXTENDFS, return to fsck() for cleanup;
 231                  * fsck(): if FM_EXTENDFS, reformat inline log and fsck
 232                  * workspace from superblock inline log descriptor and fsck
 233                  * workspace descriptor;
 234                  */
 235
 236                 /* read in superblock */
 237                 if ((rc = readSuper(sb, &bh)))
 238                         goto error_out;
 239                 j_sb = (struct jfs_superblock *)bh->b_data;
 240
 241                 /* mark extendfs() in progress */
 242                 j_sb->s_state |= cpu_to_le32(FM_EXTENDFS);
 243                 j_sb->s_xsize = cpu_to_le64(newFSSize);
 244                 PXDaddress(&j_sb->s_xfsckpxd, newFSCKAddress);
 245                 PXDlength(&j_sb->s_xfsckpxd, newFSCKSize);
 246                 PXDaddress(&j_sb->s_xlogpxd, newLogAddress);
 247                 PXDlength(&j_sb->s_xlogpxd, newLogSize);
 248
 249                 /* synchronously update superblock */
 250                 mark_buffer_dirty(bh);
 251                 sync_dirty_buffer(bh);
 252                 brelse(bh);
 253
 254                 /*
 255                  * format new inline log synchronously;
 256                  *
 257                  * crash recovery: if log move in progress,
 258                  * reformat log and exit success;
 259                  */
 260                 if (!log_formatted)
 261                         if ((rc = lmLogFormat(log, newLogAddress, newLogSize)))
 262                                 goto error_out;
 263
 264                 /*
 265                  * activate new log
 266                  */
 267                 log->base = newLogAddress;
 268                 log->size = newLogSize >> (L2LOGPSIZE - sb->s_blocksize_bits);
 269                 if ((rc = lmLogInit(log)))
 270                         goto error_out;
 271         }
 272
 273         /*
 274          *      extend block allocation map
 275          *      ---------------------------
 276          *
 277          * extendfs() for new extension, retry after crash recovery;
 278          *
 279          * note: both logredo() and fsck() rebuild map from
 280          * the bitmap and configuration parameter from superblock
 281          * (disregarding all other control information in the map);
 282          *
 283          * superblock:
 284          *  s_size: aggregate size in physical blocks;
 285          */
 286         /*
 287          *      compute the new block allocation map configuration
 288          *
 289          * map dinode:
 290          *  di_size: map file size in byte;
 291          *  di_nblocks: number of blocks allocated for map file;
 292          *  di_mapsize: number of blocks in aggregate (covered by map);
 293          * map control page:
 294          *  db_mapsize: number of blocks in aggregate (covered by map);
 295          */
 296         newMapSize = newFSSize;
 297         /* number of data pages of new bmap file:
 298          * roundup new size to full dmap page boundary and
 299          * add 1 extra dmap page for next extendfs()
 300          */
 301         t64 = (newMapSize - 1) + BPERDMAP;
 302         newNpages = BLKTODMAPN(t64) + 1;
 303
 304         /*
 305          *      extend map from current map (WITHOUT growing mapfile)
 306          *
 307          * map new extension with unmapped part of the last partial
 308          * dmap page, if applicable, and extra page(s) allocated
 309          * at end of bmap by mkfs() or previous extendfs();
 310          */
 311       extendBmap:
 312         /* compute number of blocks requested to extend */
 313         mapSize = bmp->db_mapsize;
 314         XAddress = mapSize;     /* eXtension Address */
 315         XSize = newMapSize - mapSize;   /* eXtension Size */
 316         old_agsize = bmp->db_agsize;    /* We need to know if this changes */
 317
 318         /* compute number of blocks that can be extended by current mapfile */
 319         t64 = dbMapFileSizeToMapSize(ipbmap);
 320         if (mapSize > t64) {
 321                 printk(KERN_ERR "jfs_extendfs: mapSize (0x%Lx) > t64 (0x%Lx)\n",
 322                        (long long) mapSize, (long long) t64);
 323                 rc = -EIO;
 324                 goto error_out;
 325         }
 326         nblocks = min(t64 - mapSize, XSize);
 327
 328         /*
 329          * update map pages for new extension:
 330          *
 331          * update/init dmap and bubble up the control hierarchy
 332          * incrementally fold up dmaps into upper levels;
 333          * update bmap control page;
 334          */
 335         if ((rc = dbExtendFS(ipbmap, XAddress, nblocks)))
 336                 goto error_out;
 337
 338         agsizechanged |= (bmp->db_agsize != old_agsize);
 339
 340         /*
 341          * the map now has extended to cover additional nblocks:
 342          * dn_mapsize = oldMapsize + nblocks;
 343          */
 344         /* ipbmap->i_mapsize += nblocks; */
 345         XSize -= nblocks;
 346
 347         /*
 348          *      grow map file to cover remaining extension
 349          *      and/or one extra dmap page for next extendfs();
 350          *
 351          * allocate new map pages and its backing blocks, and
 352          * update map file xtree
 353          */
 354         /* compute number of data pages of current bmap file */
 355         nPages = ipbmap->i_size >> L2PSIZE;
 356
 357         /* need to grow map file ? */
 358         if (nPages == newNpages)
 359                 goto finalizeBmap;
 360
 361         /*
 362          * grow bmap file for the new map pages required:
 363          *
 364          * allocate growth at the start of newly extended region;
 365          * bmap file only grows sequentially, i.e., both data pages
 366          * and possibly xtree index pages may grow in append mode,
 367          * s.t. logredo() can reconstruct pre-extension state
 368          * by washing away bmap file of pages outside s_size boundary;
 369          */
 370         /*
 371          * journal map file growth as if a regular file growth:
 372          * (note: bmap is created with di_mode = IFJOURNAL|IFREG);
 373          *
 374          * journaling of bmap file growth is not required since
 375          * logredo() do/can not use log records of bmap file growth
 376          * but it provides careful write semantics, pmap update, etc.;
 377          */
 378         /* synchronous write of data pages: bmap data pages are
 379          * cached in meta-data cache, and not written out
 380          * by txCommit();
 381          */
 382         rc = filemap_fdatawait(ipbmap->i_mapping);
 383         if (rc)
 384                 goto error_out;
 385
 386         rc = filemap_write_and_wait(ipbmap->i_mapping);
 387         if (rc)
 388                 goto error_out;
 389
 390         diWriteSpecial(ipbmap, 0);
 391
 392         newPage = nPages;       /* first new page number */
 393         xoff = newPage << sbi->l2nbperpage;
 394         xlen = (newNpages - nPages) << sbi->l2nbperpage;
 395         xlen = min(xlen, (int) nblocks) & ~(sbi->nbperpage - 1);
 396         xaddr = XAddress;
 397
 398         tid = txBegin(sb, COMMIT_FORCE);
 399
 400         if ((rc = xtAppend(tid, ipbmap, 0, xoff, nblocks, &xlen, &xaddr, 0))) {
 401                 txEnd(tid);
 402                 goto error_out;
 403         }
 404         /* update bmap file size */
 405         ipbmap->i_size += xlen << sbi->l2bsize;
 406         inode_add_bytes(ipbmap, xlen << sbi->l2bsize);
 407
 408         iplist[0] = ipbmap;
 409         rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
 410
 411         txEnd(tid);
 412
 413         if (rc)
 414                 goto error_out;
 415
 416         /*
 417          * map file has been grown now to cover extension to further out;
 418          * di_size = new map file size;
 419          *
 420          * if huge extension, the previous extension based on previous
 421          * map file size may not have been sufficient to cover whole extension
 422          * (it could have been used up for new map pages),
 423          * but the newly grown map file now covers lot bigger new free space
 424          * available for further extension of map;
 425          */
 426         /* any more blocks to extend ? */
 427         if (XSize)
 428                 goto extendBmap;
 429
 430       finalizeBmap:
 431         /* finalize bmap */
 432         dbFinalizeBmap(ipbmap);
 433
 434         /*
 435          *      update inode allocation map
 436          *      ---------------------------
 437          *
 438          * move iag lists from old to new iag;
 439          * agstart field is not updated for logredo() to reconstruct
 440          * iag lists if system crash occurs.
 441          * (computation of ag number from agstart based on agsize
 442          * will correctly identify the new ag);
 443          */
 444         /* if new AG size the same as old AG size, done! */
 445         if (agsizechanged) {
 446                 if ((rc = diExtendFS(ipimap, ipbmap)))
 447                         goto error_out;
 448
 449                 /* finalize imap */
 450                 if ((rc = diSync(ipimap)))
 451                         goto error_out;
 452         }
 453
 454         /*
 455          *      finalize
 456          *      --------
 457          *
 458          * extension is committed when on-disk super block is
 459          * updated with new descriptors: logredo will recover
 460          * crash before it to pre-extension state;
 461          */
 462
 463         /* sync log to skip log replay of bmap file growth transaction; */
 464         /* lmLogSync(log, 1); */
 465
 466         /*
 467          * synchronous write bmap global control page;
 468          * for crash before completion of write
 469          * logredo() will recover to pre-extendfs state;
 470          * for crash after completion of write,
 471          * logredo() will recover post-extendfs state;
 472          */
 473         if ((rc = dbSync(ipbmap)))
 474                 goto error_out;
 475
 476         /*
 477          * copy primary bmap inode to secondary bmap inode
 478          */
 479
 480         ipbmap2 = diReadSpecial(sb, BMAP_I, 1);
 481         if (ipbmap2 == NULL) {
 482                 printk(KERN_ERR "jfs_extendfs: diReadSpecial(bmap) failed\n");
 483                 goto error_out;
 484         }
 485         memcpy(&JFS_IP(ipbmap2)->i_xtroot, &JFS_IP(ipbmap)->i_xtroot, 288);
 486         ipbmap2->i_size = ipbmap->i_size;
 487         ipbmap2->i_blocks = ipbmap->i_blocks;
 488
 489         diWriteSpecial(ipbmap2, 1);
 490         diFreeSpecial(ipbmap2);
 491
 492         /*
 493          *      update superblock
 494          */
 495         if ((rc = readSuper(sb, &bh)))
 496                 goto error_out;
 497         j_sb = (struct jfs_superblock *)bh->b_data;
 498
 499         /* mark extendfs() completion */
 500         j_sb->s_state &= cpu_to_le32(~FM_EXTENDFS);
 501         j_sb->s_size = cpu_to_le64(bmp->db_mapsize <<
 502                                    le16_to_cpu(j_sb->s_l2bfactor));
 503         j_sb->s_agsize = cpu_to_le32(bmp->db_agsize);
 504
 505         /* update inline log space descriptor */
 506         if (sbi->mntflag & JFS_INLINELOG) {
 507                 PXDaddress(&(j_sb->s_logpxd), newLogAddress);
 508                 PXDlength(&(j_sb->s_logpxd), newLogSize);
 509         }
 510
 511         /* record log's mount serial number */
 512         j_sb->s_logserial = cpu_to_le32(log->serial);
 513
 514         /* update fsck work space descriptor */
 515         PXDaddress(&(j_sb->s_fsckpxd), newFSCKAddress);
 516         PXDlength(&(j_sb->s_fsckpxd), newFSCKSize);
 517         j_sb->s_fscklog = 1;
 518         /* sb->s_fsckloglen remains the same */
 519
 520         /* Update secondary superblock */
 521         bh2 = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits);
 522         if (bh2) {
 523                 j_sb2 = (struct jfs_superblock *)bh2->b_data;
 524                 memcpy(j_sb2, j_sb, sizeof (struct jfs_superblock));
 525
 526                 mark_buffer_dirty(bh);
 527                 sync_dirty_buffer(bh2);
 528                 brelse(bh2);
 529         }
 530
 531         /* write primary superblock */
 532         mark_buffer_dirty(bh);
 533         sync_dirty_buffer(bh);
 534         brelse(bh);
 535
 536         goto resume;
 537
 538       error_out:
 539         jfs_error(sb, "\n");
 540
 541       resume:
 542         /*
 543          *      resume file system transactions
 544          */
 545         txResume(sb);
 546
 547       out:
 548         return rc;
 549 }