diff options
Diffstat (limited to 'fs/jfs/resize.c')
-rw-r--r-- | fs/jfs/resize.c | 543 |
1 files changed, 543 insertions, 0 deletions
diff --git a/fs/jfs/resize.c b/fs/jfs/resize.c new file mode 100644 index 000000000..90b3bc21e --- /dev/null +++ b/fs/jfs/resize.c @@ -0,0 +1,543 @@ +/* + * Copyright (C) International Business Machines Corp., 2000-2004 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + +#include <linux/fs.h> +#include <linux/buffer_head.h> +#include <linux/quotaops.h> +#include "jfs_incore.h" +#include "jfs_filsys.h" +#include "jfs_metapage.h" +#include "jfs_dinode.h" +#include "jfs_imap.h" +#include "jfs_dmap.h" +#include "jfs_superblock.h" +#include "jfs_txnmgr.h" +#include "jfs_debug.h" + +#define BITSPERPAGE (PSIZE << 3) +#define L2MEGABYTE 20 +#define MEGABYTE (1 << L2MEGABYTE) +#define MEGABYTE32 (MEGABYTE << 5) + +/* convert block number to bmap file page number */ +#define BLKTODMAPN(b)\ + (((b) >> 13) + ((b) >> 23) + ((b) >> 33) + 3 + 1) + +/* + * jfs_extendfs() + * + * function: extend file system; + * + * |-------------------------------|----------|----------| + * file system space fsck inline log + * workspace space + * + * input: + * new LVSize: in LV blocks (required) + * new LogSize: in LV blocks (optional) + * new FSSize: in LV blocks (optional) + * + * new configuration: + * 1. set new LogSize as specified or default from new LVSize; + * 2. compute new FSCKSize from new LVSize; + * 3. set new FSSize as MIN(FSSize, LVSize-(LogSize+FSCKSize)) where + * assert(new FSSize >= old FSSize), + * i.e., file system must not be shrunk; + */ +int jfs_extendfs(struct super_block *sb, s64 newLVSize, int newLogSize) +{ + int rc = 0; + struct jfs_sb_info *sbi = JFS_SBI(sb); + struct inode *ipbmap = sbi->ipbmap; + struct inode *ipbmap2; + struct inode *ipimap = sbi->ipimap; + struct jfs_log *log = sbi->log; + struct bmap *bmp = sbi->bmap; + s64 newLogAddress, newFSCKAddress; + int newFSCKSize; + s64 newMapSize = 0, mapSize; + s64 XAddress, XSize, nblocks, xoff, xaddr, t64; + s64 oldLVSize; + s64 newFSSize; + s64 VolumeSize; + int newNpages = 0, nPages, newPage, xlen, t32; + int tid; + int log_formatted = 0; + struct inode *iplist[1]; + struct jfs_superblock *j_sb, *j_sb2; + s64 old_agsize; + int agsizechanged = 0; + struct buffer_head *bh, *bh2; + + /* If the volume hasn't grown, get out now */ + + if (sbi->mntflag & JFS_INLINELOG) + oldLVSize = addressPXD(&sbi->logpxd) + lengthPXD(&sbi->logpxd); + else + oldLVSize = addressPXD(&sbi->fsckpxd) + + lengthPXD(&sbi->fsckpxd); + + if (oldLVSize >= newLVSize) { + printk(KERN_WARNING + "jfs_extendfs: volume hasn't grown, returning\n"); + goto out; + } + + VolumeSize = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; + + if (VolumeSize) { + if (newLVSize > VolumeSize) { + printk(KERN_WARNING "jfs_extendfs: invalid size\n"); + rc = -EINVAL; + goto out; + } + } else { + /* check the device */ + bh = sb_bread(sb, newLVSize - 1); + if (!bh) { + printk(KERN_WARNING "jfs_extendfs: invalid size\n"); + rc = -EINVAL; + goto out; + } + bforget(bh); + } + + /* Can't extend write-protected drive */ + + if (isReadOnly(ipbmap)) { + printk(KERN_WARNING "jfs_extendfs: read-only file system\n"); + rc = -EROFS; + goto out; + } + + /* + * reconfigure LV spaces + * --------------------- + * + * validate new size, or, if not specified, determine new size + */ + + /* + * reconfigure inline log space: + */ + if ((sbi->mntflag & JFS_INLINELOG)) { + if (newLogSize == 0) { + /* + * no size specified: default to 1/256 of aggregate + * size; rounded up to a megabyte boundary; + */ + newLogSize = newLVSize >> 8; + t32 = (1 << (20 - sbi->l2bsize)) - 1; + newLogSize = (newLogSize + t32) & ~t32; + newLogSize = + min(newLogSize, MEGABYTE32 >> sbi->l2bsize); + } else { + /* + * convert the newLogSize to fs blocks. + * + * Since this is given in megabytes, it will always be + * an even number of pages. + */ + newLogSize = (newLogSize * MEGABYTE) >> sbi->l2bsize; + } + + } else + newLogSize = 0; + + newLogAddress = newLVSize - newLogSize; + + /* + * reconfigure fsck work space: + * + * configure it to the end of the logical volume regardless of + * whether file system extends to the end of the aggregate; + * Need enough 4k pages to cover: + * - 1 bit per block in aggregate rounded up to BPERDMAP boundary + * - 1 extra page to handle control page and intermediate level pages + * - 50 extra pages for the chkdsk service log + */ + t64 = ((newLVSize - newLogSize + BPERDMAP - 1) >> L2BPERDMAP) + << L2BPERDMAP; + t32 = DIV_ROUND_UP(t64, BITSPERPAGE) + 1 + 50; + newFSCKSize = t32 << sbi->l2nbperpage; + newFSCKAddress = newLogAddress - newFSCKSize; + + /* + * compute new file system space; + */ + newFSSize = newLVSize - newLogSize - newFSCKSize; + + /* file system cannot be shrunk */ + if (newFSSize < bmp->db_mapsize) { + rc = -EINVAL; + goto out; + } + + /* + * If we're expanding enough that the inline log does not overlap + * the old one, we can format the new log before we quiesce the + * filesystem. + */ + if ((sbi->mntflag & JFS_INLINELOG) && (newLogAddress > oldLVSize)) { + if ((rc = lmLogFormat(log, newLogAddress, newLogSize))) + goto out; + log_formatted = 1; + } + /* + * quiesce file system + * + * (prepare to move the inline log and to prevent map update) + * + * block any new transactions and wait for completion of + * all wip transactions and flush modified pages s.t. + * on-disk file system is in consistent state and + * log is not required for recovery. + */ + txQuiesce(sb); + + /* Reset size of direct inode */ + sbi->direct_inode->i_size = sb->s_bdev->bd_inode->i_size; + + if (sbi->mntflag & JFS_INLINELOG) { + /* + * deactivate old inline log + */ + lmLogShutdown(log); + + /* + * mark on-disk super block for fs in transition; + * + * update on-disk superblock for the new space configuration + * of inline log space and fsck work space descriptors: + * N.B. FS descriptor is NOT updated; + * + * crash recovery: + * logredo(): if FM_EXTENDFS, return to fsck() for cleanup; + * fsck(): if FM_EXTENDFS, reformat inline log and fsck + * workspace from superblock inline log descriptor and fsck + * workspace descriptor; + */ + + /* read in superblock */ + if ((rc = readSuper(sb, &bh))) + goto error_out; + j_sb = (struct jfs_superblock *)bh->b_data; + + /* mark extendfs() in progress */ + j_sb->s_state |= cpu_to_le32(FM_EXTENDFS); + j_sb->s_xsize = cpu_to_le64(newFSSize); + PXDaddress(&j_sb->s_xfsckpxd, newFSCKAddress); + PXDlength(&j_sb->s_xfsckpxd, newFSCKSize); + PXDaddress(&j_sb->s_xlogpxd, newLogAddress); + PXDlength(&j_sb->s_xlogpxd, newLogSize); + + /* synchronously update superblock */ + mark_buffer_dirty(bh); + sync_dirty_buffer(bh); + brelse(bh); + + /* + * format new inline log synchronously; + * + * crash recovery: if log move in progress, + * reformat log and exit success; + */ + if (!log_formatted) + if ((rc = lmLogFormat(log, newLogAddress, newLogSize))) + goto error_out; + + /* + * activate new log + */ + log->base = newLogAddress; + log->size = newLogSize >> (L2LOGPSIZE - sb->s_blocksize_bits); + if ((rc = lmLogInit(log))) + goto error_out; + } + + /* + * extend block allocation map + * --------------------------- + * + * extendfs() for new extension, retry after crash recovery; + * + * note: both logredo() and fsck() rebuild map from + * the bitmap and configuration parameter from superblock + * (disregarding all other control information in the map); + * + * superblock: + * s_size: aggregate size in physical blocks; + */ + /* + * compute the new block allocation map configuration + * + * map dinode: + * di_size: map file size in byte; + * di_nblocks: number of blocks allocated for map file; + * di_mapsize: number of blocks in aggregate (covered by map); + * map control page: + * db_mapsize: number of blocks in aggregate (covered by map); + */ + newMapSize = newFSSize; + /* number of data pages of new bmap file: + * roundup new size to full dmap page boundary and + * add 1 extra dmap page for next extendfs() + */ + t64 = (newMapSize - 1) + BPERDMAP; + newNpages = BLKTODMAPN(t64) + 1; + + /* + * extend map from current map (WITHOUT growing mapfile) + * + * map new extension with unmapped part of the last partial + * dmap page, if applicable, and extra page(s) allocated + * at end of bmap by mkfs() or previous extendfs(); + */ + extendBmap: + /* compute number of blocks requested to extend */ + mapSize = bmp->db_mapsize; + XAddress = mapSize; /* eXtension Address */ + XSize = newMapSize - mapSize; /* eXtension Size */ + old_agsize = bmp->db_agsize; /* We need to know if this changes */ + + /* compute number of blocks that can be extended by current mapfile */ + t64 = dbMapFileSizeToMapSize(ipbmap); + if (mapSize > t64) { + printk(KERN_ERR "jfs_extendfs: mapSize (0x%Lx) > t64 (0x%Lx)\n", + (long long) mapSize, (long long) t64); + rc = -EIO; + goto error_out; + } + nblocks = min(t64 - mapSize, XSize); + + /* + * update map pages for new extension: + * + * update/init dmap and bubble up the control hierarchy + * incrementally fold up dmaps into upper levels; + * update bmap control page; + */ + if ((rc = dbExtendFS(ipbmap, XAddress, nblocks))) + goto error_out; + + agsizechanged |= (bmp->db_agsize != old_agsize); + + /* + * the map now has extended to cover additional nblocks: + * dn_mapsize = oldMapsize + nblocks; + */ + /* ipbmap->i_mapsize += nblocks; */ + XSize -= nblocks; + + /* + * grow map file to cover remaining extension + * and/or one extra dmap page for next extendfs(); + * + * allocate new map pages and its backing blocks, and + * update map file xtree + */ + /* compute number of data pages of current bmap file */ + nPages = ipbmap->i_size >> L2PSIZE; + + /* need to grow map file ? */ + if (nPages == newNpages) + goto finalizeBmap; + + /* + * grow bmap file for the new map pages required: + * + * allocate growth at the start of newly extended region; + * bmap file only grows sequentially, i.e., both data pages + * and possibly xtree index pages may grow in append mode, + * s.t. logredo() can reconstruct pre-extension state + * by washing away bmap file of pages outside s_size boundary; + */ + /* + * journal map file growth as if a regular file growth: + * (note: bmap is created with di_mode = IFJOURNAL|IFREG); + * + * journaling of bmap file growth is not required since + * logredo() do/can not use log records of bmap file growth + * but it provides careful write semantics, pmap update, etc.; + */ + /* synchronous write of data pages: bmap data pages are + * cached in meta-data cache, and not written out + * by txCommit(); + */ + filemap_fdatawait(ipbmap->i_mapping); + filemap_write_and_wait(ipbmap->i_mapping); + diWriteSpecial(ipbmap, 0); + + newPage = nPages; /* first new page number */ + xoff = newPage << sbi->l2nbperpage; + xlen = (newNpages - nPages) << sbi->l2nbperpage; + xlen = min(xlen, (int) nblocks) & ~(sbi->nbperpage - 1); + xaddr = XAddress; + + tid = txBegin(sb, COMMIT_FORCE); + + if ((rc = xtAppend(tid, ipbmap, 0, xoff, nblocks, &xlen, &xaddr, 0))) { + txEnd(tid); + goto error_out; + } + /* update bmap file size */ + ipbmap->i_size += xlen << sbi->l2bsize; + inode_add_bytes(ipbmap, xlen << sbi->l2bsize); + + iplist[0] = ipbmap; + rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE); + + txEnd(tid); + + if (rc) + goto error_out; + + /* + * map file has been grown now to cover extension to further out; + * di_size = new map file size; + * + * if huge extension, the previous extension based on previous + * map file size may not have been sufficient to cover whole extension + * (it could have been used up for new map pages), + * but the newly grown map file now covers lot bigger new free space + * available for further extension of map; + */ + /* any more blocks to extend ? */ + if (XSize) + goto extendBmap; + + finalizeBmap: + /* finalize bmap */ + dbFinalizeBmap(ipbmap); + + /* + * update inode allocation map + * --------------------------- + * + * move iag lists from old to new iag; + * agstart field is not updated for logredo() to reconstruct + * iag lists if system crash occurs. + * (computation of ag number from agstart based on agsize + * will correctly identify the new ag); + */ + /* if new AG size the same as old AG size, done! */ + if (agsizechanged) { + if ((rc = diExtendFS(ipimap, ipbmap))) + goto error_out; + + /* finalize imap */ + if ((rc = diSync(ipimap))) + goto error_out; + } + + /* + * finalize + * -------- + * + * extension is committed when on-disk super block is + * updated with new descriptors: logredo will recover + * crash before it to pre-extension state; + */ + + /* sync log to skip log replay of bmap file growth transaction; */ + /* lmLogSync(log, 1); */ + + /* + * synchronous write bmap global control page; + * for crash before completion of write + * logredo() will recover to pre-extendfs state; + * for crash after completion of write, + * logredo() will recover post-extendfs state; + */ + if ((rc = dbSync(ipbmap))) + goto error_out; + + /* + * copy primary bmap inode to secondary bmap inode + */ + + ipbmap2 = diReadSpecial(sb, BMAP_I, 1); + if (ipbmap2 == NULL) { + printk(KERN_ERR "jfs_extendfs: diReadSpecial(bmap) failed\n"); + goto error_out; + } + memcpy(&JFS_IP(ipbmap2)->i_xtroot, &JFS_IP(ipbmap)->i_xtroot, 288); + ipbmap2->i_size = ipbmap->i_size; + ipbmap2->i_blocks = ipbmap->i_blocks; + + diWriteSpecial(ipbmap2, 1); + diFreeSpecial(ipbmap2); + + /* + * update superblock + */ + if ((rc = readSuper(sb, &bh))) + goto error_out; + j_sb = (struct jfs_superblock *)bh->b_data; + + /* mark extendfs() completion */ + j_sb->s_state &= cpu_to_le32(~FM_EXTENDFS); + j_sb->s_size = cpu_to_le64(bmp->db_mapsize << + le16_to_cpu(j_sb->s_l2bfactor)); + j_sb->s_agsize = cpu_to_le32(bmp->db_agsize); + + /* update inline log space descriptor */ + if (sbi->mntflag & JFS_INLINELOG) { + PXDaddress(&(j_sb->s_logpxd), newLogAddress); + PXDlength(&(j_sb->s_logpxd), newLogSize); + } + + /* record log's mount serial number */ + j_sb->s_logserial = cpu_to_le32(log->serial); + + /* update fsck work space descriptor */ + PXDaddress(&(j_sb->s_fsckpxd), newFSCKAddress); + PXDlength(&(j_sb->s_fsckpxd), newFSCKSize); + j_sb->s_fscklog = 1; + /* sb->s_fsckloglen remains the same */ + + /* Update secondary superblock */ + bh2 = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits); + if (bh2) { + j_sb2 = (struct jfs_superblock *)bh2->b_data; + memcpy(j_sb2, j_sb, sizeof (struct jfs_superblock)); + + mark_buffer_dirty(bh); + sync_dirty_buffer(bh2); + brelse(bh2); + } + + /* write primary superblock */ + mark_buffer_dirty(bh); + sync_dirty_buffer(bh); + brelse(bh); + + goto resume; + + error_out: + jfs_error(sb, "\n"); + + resume: + /* + * resume file system transactions + */ + txResume(sb); + + out: + return rc; +} |