linux/fs/jfs/resize.c
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   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 */
  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        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 = sb->s_bdev->bd_inode->i_size >> 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 =  sb->s_bdev->bd_inode->i_size;
 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        filemap_fdatawait(ipbmap->i_mapping);
 383        filemap_write_and_wait(ipbmap->i_mapping);
 384        diWriteSpecial(ipbmap, 0);
 385
 386        newPage = nPages;       /* first new page number */
 387        xoff = newPage << sbi->l2nbperpage;
 388        xlen = (newNpages - nPages) << sbi->l2nbperpage;
 389        xlen = min(xlen, (int) nblocks) & ~(sbi->nbperpage - 1);
 390        xaddr = XAddress;
 391
 392        tid = txBegin(sb, COMMIT_FORCE);
 393
 394        if ((rc = xtAppend(tid, ipbmap, 0, xoff, nblocks, &xlen, &xaddr, 0))) {
 395                txEnd(tid);
 396                goto error_out;
 397        }
 398        /* update bmap file size */
 399        ipbmap->i_size += xlen << sbi->l2bsize;
 400        inode_add_bytes(ipbmap, xlen << sbi->l2bsize);
 401
 402        iplist[0] = ipbmap;
 403        rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
 404
 405        txEnd(tid);
 406
 407        if (rc)
 408                goto error_out;
 409
 410        /*
 411         * map file has been grown now to cover extension to further out;
 412         * di_size = new map file size;
 413         *
 414         * if huge extension, the previous extension based on previous
 415         * map file size may not have been sufficient to cover whole extension
 416         * (it could have been used up for new map pages),
 417         * but the newly grown map file now covers lot bigger new free space
 418         * available for further extension of map;
 419         */
 420        /* any more blocks to extend ? */
 421        if (XSize)
 422                goto extendBmap;
 423
 424      finalizeBmap:
 425        /* finalize bmap */
 426        dbFinalizeBmap(ipbmap);
 427
 428        /*
 429         *      update inode allocation map
 430         *      ---------------------------
 431         *
 432         * move iag lists from old to new iag;
 433         * agstart field is not updated for logredo() to reconstruct
 434         * iag lists if system crash occurs.
 435         * (computation of ag number from agstart based on agsize
 436         * will correctly identify the new ag);
 437         */
 438        /* if new AG size the same as old AG size, done! */
 439        if (agsizechanged) {
 440                if ((rc = diExtendFS(ipimap, ipbmap)))
 441                        goto error_out;
 442
 443                /* finalize imap */
 444                if ((rc = diSync(ipimap)))
 445                        goto error_out;
 446        }
 447
 448        /*
 449         *      finalize
 450         *      --------
 451         *
 452         * extension is committed when on-disk super block is
 453         * updated with new descriptors: logredo will recover
 454         * crash before it to pre-extension state;
 455         */
 456
 457        /* sync log to skip log replay of bmap file growth transaction; */
 458        /* lmLogSync(log, 1); */
 459
 460        /*
 461         * synchronous write bmap global control page;
 462         * for crash before completion of write
 463         * logredo() will recover to pre-extendfs state;
 464         * for crash after completion of write,
 465         * logredo() will recover post-extendfs state;
 466         */
 467        if ((rc = dbSync(ipbmap)))
 468                goto error_out;
 469
 470        /*
 471         * copy primary bmap inode to secondary bmap inode
 472         */
 473
 474        ipbmap2 = diReadSpecial(sb, BMAP_I, 1);
 475        if (ipbmap2 == NULL) {
 476                printk(KERN_ERR "jfs_extendfs: diReadSpecial(bmap) failed\n");
 477                goto error_out;
 478        }
 479        memcpy(&JFS_IP(ipbmap2)->i_xtroot, &JFS_IP(ipbmap)->i_xtroot, 288);
 480        ipbmap2->i_size = ipbmap->i_size;
 481        ipbmap2->i_blocks = ipbmap->i_blocks;
 482
 483        diWriteSpecial(ipbmap2, 1);
 484        diFreeSpecial(ipbmap2);
 485
 486        /*
 487         *      update superblock
 488         */
 489        if ((rc = readSuper(sb, &bh)))
 490                goto error_out;
 491        j_sb = (struct jfs_superblock *)bh->b_data;
 492
 493        /* mark extendfs() completion */
 494        j_sb->s_state &= cpu_to_le32(~FM_EXTENDFS);
 495        j_sb->s_size = cpu_to_le64(bmp->db_mapsize <<
 496                                   le16_to_cpu(j_sb->s_l2bfactor));
 497        j_sb->s_agsize = cpu_to_le32(bmp->db_agsize);
 498
 499        /* update inline log space descriptor */
 500        if (sbi->mntflag & JFS_INLINELOG) {
 501                PXDaddress(&(j_sb->s_logpxd), newLogAddress);
 502                PXDlength(&(j_sb->s_logpxd), newLogSize);
 503        }
 504
 505        /* record log's mount serial number */
 506        j_sb->s_logserial = cpu_to_le32(log->serial);
 507
 508        /* update fsck work space descriptor */
 509        PXDaddress(&(j_sb->s_fsckpxd), newFSCKAddress);
 510        PXDlength(&(j_sb->s_fsckpxd), newFSCKSize);
 511        j_sb->s_fscklog = 1;
 512        /* sb->s_fsckloglen remains the same */
 513
 514        /* Update secondary superblock */
 515        bh2 = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits);
 516        if (bh2) {
 517                j_sb2 = (struct jfs_superblock *)bh2->b_data;
 518                memcpy(j_sb2, j_sb, sizeof (struct jfs_superblock));
 519
 520                mark_buffer_dirty(bh);
 521                sync_dirty_buffer(bh2);
 522                brelse(bh2);
 523        }
 524
 525        /* write primary superblock */
 526        mark_buffer_dirty(bh);
 527        sync_dirty_buffer(bh);
 528        brelse(bh);
 529
 530        goto resume;
 531
 532      error_out:
 533        jfs_error(sb, "jfs_extendfs");
 534
 535      resume:
 536        /*
 537         *      resume file system transactions
 538         */
 539        txResume(sb);
 540
 541      out:
 542        return rc;
 543}
 544
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