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 shrinked;
  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         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_fdatawrite(ipbmap->i_mapping);
 380         filemap_fdatawait(ipbmap->i_mapping);
 381         diWriteSpecial(ipbmap, 0);
 382
 383         newPage = nPages;       /* first new page number */
 384         xoff = newPage << sbi->l2nbperpage;
 385         xlen = (newNpages - nPages) << sbi->l2nbperpage;
 386         xlen = min(xlen, (int) nblocks) & ~(sbi->nbperpage - 1);
 387         xaddr = XAddress;
 388
 389         tid = txBegin(sb, COMMIT_FORCE);
 390
 391         if ((rc = xtAppend(tid, ipbmap, 0, xoff, nblocks, &xlen, &xaddr, 0))) {
 392                 txEnd(tid);
 393                 goto error_out;
 394         }
 395         /* update bmap file size */
 396         ipbmap->i_size += xlen << sbi->l2bsize;
 397         inode_add_bytes(ipbmap, xlen << sbi->l2bsize);
 398
 399         iplist[0] = ipbmap;
 400         rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
 401
 402         txEnd(tid);
 403
 404         if (rc)
 405                 goto error_out;
 406
 407         /*
 408          * map file has been grown now to cover extension to further out;
 409          * di_size = new map file size;
 410          *
 411          * if huge extension, the previous extension based on previous
 412          * map file size may not have been sufficient to cover whole extension
 413          * (it could have been used up for new map pages),
 414          * but the newly grown map file now covers lot bigger new free space
 415          * available for further extension of map;
 416          */
 417         /* any more blocks to extend ? */
 418         if (XSize)
 419                 goto extendBmap;
 420
 421       finalizeBmap:
 422         /* finalize bmap */
 423         dbFinalizeBmap(ipbmap);
 424
 425         /*
 426          *      update inode allocation map
 427          *      ---------------------------
 428          *
 429          * move iag lists from old to new iag;
 430          * agstart field is not updated for logredo() to reconstruct
 431          * iag lists if system crash occurs.
 432          * (computation of ag number from agstart based on agsize
 433          * will correctly identify the new ag);
 434          */
 435         /* if new AG size the same as old AG size, done! */
 436         if (bmp->db_agsize != old_agsize) {
 437                 if ((rc = diExtendFS(ipimap, ipbmap)))
 438                         goto error_out;
 439
 440                 /* finalize imap */
 441                 if ((rc = diSync(ipimap)))
 442                         goto error_out;
 443         }
 444
 445         /*
 446          *      finalize
 447          *      --------
 448          *
 449          * extension is committed when on-disk super block is
 450          * updated with new descriptors: logredo will recover
 451          * crash before it to pre-extension state;
 452          */
 453
 454         /* sync log to skip log replay of bmap file growth transaction; */
 455         /* lmLogSync(log, 1); */
 456
 457         /*
 458          * synchronous write bmap global control page;
 459          * for crash before completion of write
 460          * logredo() will recover to pre-extendfs state;
 461          * for crash after completion of write,
 462          * logredo() will recover post-extendfs state;
 463          */
 464         if ((rc = dbSync(ipbmap)))
 465                 goto error_out;
 466
 467         /*
 468          * copy primary bmap inode to secondary bmap inode
 469          */
 470
 471         ipbmap2 = diReadSpecial(sb, BMAP_I, 1);
 472         if (ipbmap2 == NULL) {
 473                 printk(KERN_ERR "jfs_extendfs: diReadSpecial(bmap) failed\n");
 474                 goto error_out;
 475         }
 476         memcpy(&JFS_IP(ipbmap2)->i_xtroot, &JFS_IP(ipbmap)->i_xtroot, 288);
 477         ipbmap2->i_size = ipbmap->i_size;
 478         ipbmap2->i_blocks = ipbmap->i_blocks;
 479
 480         diWriteSpecial(ipbmap2, 1);
 481         diFreeSpecial(ipbmap2);
 482
 483         /*
 484          *      update superblock
 485          */
 486         if ((rc = readSuper(sb, &bh)))
 487                 goto error_out;
 488         j_sb = (struct jfs_superblock *)bh->b_data;
 489
 490         /* mark extendfs() completion */
 491         j_sb->s_state &= cpu_to_le32(~FM_EXTENDFS);
 492         j_sb->s_size = cpu_to_le64(bmp->db_mapsize <<
 493                                    le16_to_cpu(j_sb->s_l2bfactor));
 494         j_sb->s_agsize = cpu_to_le32(bmp->db_agsize);
 495
 496         /* update inline log space descriptor */
 497         if (sbi->mntflag & JFS_INLINELOG) {
 498                 PXDaddress(&(j_sb->s_logpxd), newLogAddress);
 499                 PXDlength(&(j_sb->s_logpxd), newLogSize);
 500         }
 501
 502         /* record log's mount serial number */
 503         j_sb->s_logserial = cpu_to_le32(log->serial);
 504
 505         /* update fsck work space descriptor */
 506         PXDaddress(&(j_sb->s_fsckpxd), newFSCKAddress);
 507         PXDlength(&(j_sb->s_fsckpxd), newFSCKSize);
 508         j_sb->s_fscklog = 1;
 509         /* sb->s_fsckloglen remains the same */
 510
 511         /* Update secondary superblock */
 512         bh2 = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits);
 513         if (bh2) {
 514                 j_sb2 = (struct jfs_superblock *)bh2->b_data;
 515                 memcpy(j_sb2, j_sb, sizeof (struct jfs_superblock));
 516
 517                 mark_buffer_dirty(bh);
 518                 sync_dirty_buffer(bh2);
 519                 brelse(bh2);
 520         }
 521
 522         /* write primary superblock */
 523         mark_buffer_dirty(bh);
 524         sync_dirty_buffer(bh);
 525         brelse(bh);
 526
 527         goto resume;
 528
 529       error_out:
 530         jfs_error(sb, "jfs_extendfs");
 531
 532       resume:
 533         /*
 534          *      resume file system transactions
 535          */
 536         txResume(sb);
 537
 538       out:
 539         return rc;
 540 }