fs/jfs/resize.c

   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  */
  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 }