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-rw-r--r--fs/jfs/resize.c537
1 files changed, 537 insertions, 0 deletions
diff --git a/fs/jfs/resize.c b/fs/jfs/resize.c
new file mode 100644
index 0000000..2eb6869
--- /dev/null
+++ b/fs/jfs/resize.c
@@ -0,0 +1,537 @@
+/*
+ * 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 shrinked;
+ */
+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;
+ uint old_agsize;
+ 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 = ((t64 + (BITSPERPAGE - 1)) / BITSPERPAGE) + 1 + 50;
+ newFSCKSize = t32 << sbi->l2nbperpage;
+ newFSCKAddress = newLogAddress - newFSCKSize;
+
+ /*
+ * compute new file system space;
+ */
+ newFSSize = newLVSize - newLogSize - newFSCKSize;
+
+ /* file system cannot be shrinked */
+ 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);
+
+ 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;
+ /*
+ * 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_fdatawrite(ipbmap->i_mapping);
+ filemap_fdatawait(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 (bmp->db_agsize != old_agsize) {
+ 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, "jfs_extendfs");
+
+ resume:
+ /*
+ * resume file system transactions
+ */
+ txResume(sb);
+
+ out:
+ return rc;
+}
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