Initial import

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;
+}