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- /*
- * 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;
- }
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