[linux.git] / fs / jfs / resize.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   Copyright (C) International Business Machines  Corp., 2000-2004
*/

#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/quotaops.h>
#include <linux/blkdev.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_bdev_nr_blocks(sb);
	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 = bdev_nr_bytes(sb->s_bdev);

	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();
	 */
	rc = filemap_fdatawait(ipbmap->i_mapping);
	if (rc)
		goto error_out;

	rc = filemap_write_and_wait(ipbmap->i_mapping);
	if (rc)
		goto error_out;

	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;
}
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
1da177e4 LT	3	* Copyright (C) International Business Machines Corp., 2000-2004
1da177e4 LT	4	*/
	5
	6	#include <linux/fs.h>
	7	#include <linux/buffer_head.h>
	8	#include <linux/quotaops.h>
621c1f42	9	#include <linux/blkdev.h>
1da177e4 LT	10	#include "jfs_incore.h"
	11	#include "jfs_filsys.h"
	12	#include "jfs_metapage.h"
	13	#include "jfs_dinode.h"
	14	#include "jfs_imap.h"
	15	#include "jfs_dmap.h"
	16	#include "jfs_superblock.h"
	17	#include "jfs_txnmgr.h"
	18	#include "jfs_debug.h"
	19
f720e3ba DK	20	#define BITSPERPAGE (PSIZE << 3)
	21	#define L2MEGABYTE 20
	22	#define MEGABYTE (1 << L2MEGABYTE)
	23	#define MEGABYTE32 (MEGABYTE << 5)
1da177e4 LT	24
	25	/* convert block number to bmap file page number */
	26	#define BLKTODMAPN(b)\
f720e3ba	27	(((b) >> 13) + ((b) >> 23) + ((b) >> 33) + 3 + 1)
1da177e4 LT	28
1da177e4 LT	29	/*
f720e3ba	30	* jfs_extendfs()
1da177e4 LT	31	*
	32	* function: extend file system;
	33	*
	34	* \|-------------------------------\|----------\|----------\|
	35	* file system space fsck inline log
	36	* workspace space
	37	*
	38	* input:
f720e3ba DK	39	* new LVSize: in LV blocks (required)
	40	* new LogSize: in LV blocks (optional)
	41	* new FSSize: in LV blocks (optional)
1da177e4 LT	42	*
	43	* new configuration:
	44	* 1. set new LogSize as specified or default from new LVSize;
	45	* 2. compute new FSCKSize from new LVSize;
	46	* 3. set new FSSize as MIN(FSSize, LVSize-(LogSize+FSCKSize)) where
	47	* assert(new FSSize >= old FSSize),
25985edc	48	* i.e., file system must not be shrunk;
1da177e4 LT	49	*/
	50	int jfs_extendfs(struct super_block *sb, s64 newLVSize, int newLogSize)
	51	{
	52	int rc = 0;
	53	struct jfs_sb_info *sbi = JFS_SBI(sb);
	54	struct inode *ipbmap = sbi->ipbmap;
	55	struct inode *ipbmap2;
	56	struct inode *ipimap = sbi->ipimap;
	57	struct jfs_log *log = sbi->log;
	58	struct bmap *bmp = sbi->bmap;
	59	s64 newLogAddress, newFSCKAddress;
	60	int newFSCKSize;
	61	s64 newMapSize = 0, mapSize;
	62	s64 XAddress, XSize, nblocks, xoff, xaddr, t64;
	63	s64 oldLVSize;
	64	s64 newFSSize;
	65	s64 VolumeSize;
	66	int newNpages = 0, nPages, newPage, xlen, t32;
	67	int tid;
	68	int log_formatted = 0;
	69	struct inode *iplist[1];
	70	struct jfs_superblock j_sb, j_sb2;
206b6310	71	s64 old_agsize;
2b0b3951	72	int agsizechanged = 0;
1da177e4 LT	73	struct buffer_head bh, bh2;
	74
	75	/* If the volume hasn't grown, get out now */
	76
	77	if (sbi->mntflag & JFS_INLINELOG)
	78	oldLVSize = addressPXD(&sbi->logpxd) + lengthPXD(&sbi->logpxd);
	79	else
	80	oldLVSize = addressPXD(&sbi->fsckpxd) +
	81	lengthPXD(&sbi->fsckpxd);
	82
	83	if (oldLVSize >= newLVSize) {
	84	printk(KERN_WARNING
	85	"jfs_extendfs: volume hasn't grown, returning\n");
	86	goto out;
	87	}
	88
dd0c0bdf	89	VolumeSize = sb_bdev_nr_blocks(sb);
1da177e4 LT	90	if (VolumeSize) {
	91	if (newLVSize > VolumeSize) {
	92	printk(KERN_WARNING "jfs_extendfs: invalid size\n");
	93	rc = -EINVAL;
	94	goto out;
	95	}
	96	} else {
	97	/* check the device */
	98	bh = sb_bread(sb, newLVSize - 1);
	99	if (!bh) {
	100	printk(KERN_WARNING "jfs_extendfs: invalid size\n");
	101	rc = -EINVAL;
	102	goto out;
	103	}
	104	bforget(bh);
	105	}
	106
	107	/* Can't extend write-protected drive */
	108
	109	if (isReadOnly(ipbmap)) {
	110	printk(KERN_WARNING "jfs_extendfs: read-only file system\n");
	111	rc = -EROFS;
	112	goto out;
	113	}
	114
	115	/*
f720e3ba DK	116	* reconfigure LV spaces
f720e3ba DK	117	* ---------------------
1da177e4 LT	118	*
	119	* validate new size, or, if not specified, determine new size
	120	*/
	121
	122	/*
	123	* reconfigure inline log space:
	124	*/
	125	if ((sbi->mntflag & JFS_INLINELOG)) {
	126	if (newLogSize == 0) {
	127	/*
	128	* no size specified: default to 1/256 of aggregate
	129	* size; rounded up to a megabyte boundary;
	130	*/
	131	newLogSize = newLVSize >> 8;
	132	t32 = (1 << (20 - sbi->l2bsize)) - 1;
	133	newLogSize = (newLogSize + t32) & ~t32;
	134	newLogSize =
	135	min(newLogSize, MEGABYTE32 >> sbi->l2bsize);
	136	} else {
	137	/*
	138	* convert the newLogSize to fs blocks.
	139	*
	140	* Since this is given in megabytes, it will always be
	141	* an even number of pages.
	142	*/
	143	newLogSize = (newLogSize * MEGABYTE) >> sbi->l2bsize;
	144	}
	145
	146	} else
	147	newLogSize = 0;
	148
	149	newLogAddress = newLVSize - newLogSize;
	150
	151	/*
	152	* reconfigure fsck work space:
	153	*
	154	* configure it to the end of the logical volume regardless of
	155	* whether file system extends to the end of the aggregate;
	156	* Need enough 4k pages to cover:
	157	* - 1 bit per block in aggregate rounded up to BPERDMAP boundary
	158	* - 1 extra page to handle control page and intermediate level pages
	159	* - 50 extra pages for the chkdsk service log
	160	*/
	161	t64 = ((newLVSize - newLogSize + BPERDMAP - 1) >> L2BPERDMAP)
	162	<< L2BPERDMAP;
a7fe0ba7	163	t32 = DIV_ROUND_UP(t64, BITSPERPAGE) + 1 + 50;
1da177e4 LT	164	newFSCKSize = t32 << sbi->l2nbperpage;
	165	newFSCKAddress = newLogAddress - newFSCKSize;
	166
	167	/*
	168	* compute new file system space;
	169	*/
	170	newFSSize = newLVSize - newLogSize - newFSCKSize;
	171
25985edc	172	/* file system cannot be shrunk */
1da177e4 LT	173	if (newFSSize < bmp->db_mapsize) {
	174	rc = -EINVAL;
	175	goto out;
	176	}
	177
	178	/*
	179	* If we're expanding enough that the inline log does not overlap
	180	* the old one, we can format the new log before we quiesce the
	181	* filesystem.
	182	*/
	183	if ((sbi->mntflag & JFS_INLINELOG) && (newLogAddress > oldLVSize)) {
	184	if ((rc = lmLogFormat(log, newLogAddress, newLogSize)))
	185	goto out;
	186	log_formatted = 1;
	187	}
	188	/*
f720e3ba	189	* quiesce file system
1da177e4 LT	190	*
	191	* (prepare to move the inline log and to prevent map update)
	192	*
	193	* block any new transactions and wait for completion of
	194	* all wip transactions and flush modified pages s.t.
	195	* on-disk file system is in consistent state and
	196	* log is not required for recovery.
	197	*/
	198	txQuiesce(sb);
	199
7fab479b	200	/* Reset size of direct inode */
74e157e6	201	sbi->direct_inode->i_size = bdev_nr_bytes(sb->s_bdev);
7fab479b	202
1da177e4 LT	203	if (sbi->mntflag & JFS_INLINELOG) {
	204	/*
	205	* deactivate old inline log
	206	*/
	207	lmLogShutdown(log);
	208
	209	/*
	210	* mark on-disk super block for fs in transition;
	211	*
	212	* update on-disk superblock for the new space configuration
	213	* of inline log space and fsck work space descriptors:
	214	* N.B. FS descriptor is NOT updated;
	215	*
	216	* crash recovery:
	217	* logredo(): if FM_EXTENDFS, return to fsck() for cleanup;
	218	* fsck(): if FM_EXTENDFS, reformat inline log and fsck
	219	* workspace from superblock inline log descriptor and fsck
	220	* workspace descriptor;
	221	*/
	222
	223	/* read in superblock */
	224	if ((rc = readSuper(sb, &bh)))
	225	goto error_out;
	226	j_sb = (struct jfs_superblock *)bh->b_data;
	227
	228	/* mark extendfs() in progress */
	229	j_sb->s_state \|= cpu_to_le32(FM_EXTENDFS);
	230	j_sb->s_xsize = cpu_to_le64(newFSSize);
	231	PXDaddress(&j_sb->s_xfsckpxd, newFSCKAddress);
	232	PXDlength(&j_sb->s_xfsckpxd, newFSCKSize);
	233	PXDaddress(&j_sb->s_xlogpxd, newLogAddress);
	234	PXDlength(&j_sb->s_xlogpxd, newLogSize);
	235
	236	/* synchronously update superblock */
	237	mark_buffer_dirty(bh);
	238	sync_dirty_buffer(bh);
	239	brelse(bh);
	240
	241	/*
	242	* format new inline log synchronously;
	243	*
	244	* crash recovery: if log move in progress,
	245	* reformat log and exit success;
	246	*/
	247	if (!log_formatted)
	248	if ((rc = lmLogFormat(log, newLogAddress, newLogSize)))
	249	goto error_out;
	250
	251	/*
	252	* activate new log
	253	*/
	254	log->base = newLogAddress;
	255	log->size = newLogSize >> (L2LOGPSIZE - sb->s_blocksize_bits);
	256	if ((rc = lmLogInit(log)))
	257	goto error_out;
	258	}
	259
	260	/*
f720e3ba DK	261	* extend block allocation map
f720e3ba DK	262	* ---------------------------
1da177e4 LT	263	*
	264	* extendfs() for new extension, retry after crash recovery;
	265	*
	266	* note: both logredo() and fsck() rebuild map from
	267	* the bitmap and configuration parameter from superblock
	268	* (disregarding all other control information in the map);
	269	*
	270	* superblock:
	271	* s_size: aggregate size in physical blocks;
	272	*/
	273	/*
f720e3ba	274	* compute the new block allocation map configuration
1da177e4 LT	275	*
	276	* map dinode:
	277	* di_size: map file size in byte;
	278	* di_nblocks: number of blocks allocated for map file;
	279	* di_mapsize: number of blocks in aggregate (covered by map);
	280	* map control page:
	281	* db_mapsize: number of blocks in aggregate (covered by map);
	282	*/
	283	newMapSize = newFSSize;
	284	/* number of data pages of new bmap file:
	285	* roundup new size to full dmap page boundary and
	286	* add 1 extra dmap page for next extendfs()
	287	*/
	288	t64 = (newMapSize - 1) + BPERDMAP;
	289	newNpages = BLKTODMAPN(t64) + 1;
	290
	291	/*
f720e3ba	292	* extend map from current map (WITHOUT growing mapfile)
1da177e4 LT	293	*
	294	* map new extension with unmapped part of the last partial
	295	* dmap page, if applicable, and extra page(s) allocated
	296	* at end of bmap by mkfs() or previous extendfs();
	297	*/
	298	extendBmap:
	299	/* compute number of blocks requested to extend */
	300	mapSize = bmp->db_mapsize;
	301	XAddress = mapSize; /* eXtension Address */
	302	XSize = newMapSize - mapSize; /* eXtension Size */
	303	old_agsize = bmp->db_agsize; /* We need to know if this changes */
	304
	305	/* compute number of blocks that can be extended by current mapfile */
	306	t64 = dbMapFileSizeToMapSize(ipbmap);
	307	if (mapSize > t64) {
	308	printk(KERN_ERR "jfs_extendfs: mapSize (0x%Lx) > t64 (0x%Lx)\n",
	309	(long long) mapSize, (long long) t64);
	310	rc = -EIO;
	311	goto error_out;
	312	}
	313	nblocks = min(t64 - mapSize, XSize);
	314
	315	/*
	316	* update map pages for new extension:
	317	*
	318	* update/init dmap and bubble up the control hierarchy
	319	* incrementally fold up dmaps into upper levels;
	320	* update bmap control page;
	321	*/
	322	if ((rc = dbExtendFS(ipbmap, XAddress, nblocks)))
	323	goto error_out;
2b0b3951 BP	324
	325	agsizechanged \|= (bmp->db_agsize != old_agsize);
	326
1da177e4 LT	327	/*
	328	* the map now has extended to cover additional nblocks:
	329	* dn_mapsize = oldMapsize + nblocks;
	330	*/
	331	/* ipbmap->i_mapsize += nblocks; */
	332	XSize -= nblocks;
	333
	334	/*
f720e3ba DK	335	* grow map file to cover remaining extension
f720e3ba DK	336	* and/or one extra dmap page for next extendfs();
1da177e4 LT	337	*
	338	* allocate new map pages and its backing blocks, and
	339	* update map file xtree
	340	*/
	341	/* compute number of data pages of current bmap file */
	342	nPages = ipbmap->i_size >> L2PSIZE;
	343
	344	/* need to grow map file ? */
	345	if (nPages == newNpages)
	346	goto finalizeBmap;
	347
	348	/*
	349	* grow bmap file for the new map pages required:
	350	*
	351	* allocate growth at the start of newly extended region;
	352	* bmap file only grows sequentially, i.e., both data pages
	353	* and possibly xtree index pages may grow in append mode,
	354	* s.t. logredo() can reconstruct pre-extension state
	355	* by washing away bmap file of pages outside s_size boundary;
	356	*/
	357	/*
	358	* journal map file growth as if a regular file growth:
	359	* (note: bmap is created with di_mode = IFJOURNAL\|IFREG);
	360	*
	361	* journaling of bmap file growth is not required since
	362	* logredo() do/can not use log records of bmap file growth
	363	* but it provides careful write semantics, pmap update, etc.;
	364	*/
	365	/* synchronous write of data pages: bmap data pages are
	366	* cached in meta-data cache, and not written out
	367	* by txCommit();
	368	*/
7cfcd8b7 QL	369	rc = filemap_fdatawait(ipbmap->i_mapping);
	370	if (rc)
	371	goto error_out;
	372
	373	rc = filemap_write_and_wait(ipbmap->i_mapping);
	374	if (rc)
	375	goto error_out;
	376
1da177e4 LT	377	diWriteSpecial(ipbmap, 0);
	378
	379	newPage = nPages; /* first new page number */
	380	xoff = newPage << sbi->l2nbperpage;
	381	xlen = (newNpages - nPages) << sbi->l2nbperpage;
	382	xlen = min(xlen, (int) nblocks) & ~(sbi->nbperpage - 1);
	383	xaddr = XAddress;
	384
	385	tid = txBegin(sb, COMMIT_FORCE);
	386
	387	if ((rc = xtAppend(tid, ipbmap, 0, xoff, nblocks, &xlen, &xaddr, 0))) {
	388	txEnd(tid);
	389	goto error_out;
	390	}
	391	/* update bmap file size */
	392	ipbmap->i_size += xlen << sbi->l2bsize;
	393	inode_add_bytes(ipbmap, xlen << sbi->l2bsize);
	394
	395	iplist[0] = ipbmap;
	396	rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
	397
	398	txEnd(tid);
	399
	400	if (rc)
	401	goto error_out;
	402
	403	/*
	404	* map file has been grown now to cover extension to further out;
	405	* di_size = new map file size;
	406	*
	407	* if huge extension, the previous extension based on previous
	408	* map file size may not have been sufficient to cover whole extension
	409	* (it could have been used up for new map pages),
	410	* but the newly grown map file now covers lot bigger new free space
	411	* available for further extension of map;
	412	*/
	413	/* any more blocks to extend ? */
	414	if (XSize)
	415	goto extendBmap;
	416
	417	finalizeBmap:
	418	/* finalize bmap */
	419	dbFinalizeBmap(ipbmap);
	420
	421	/*
f720e3ba DK	422	* update inode allocation map
f720e3ba DK	423	* ---------------------------
1da177e4 LT	424	*
	425	* move iag lists from old to new iag;
	426	* agstart field is not updated for logredo() to reconstruct
	427	* iag lists if system crash occurs.
	428	* (computation of ag number from agstart based on agsize
	429	* will correctly identify the new ag);
	430	*/
	431	/* if new AG size the same as old AG size, done! */
2b0b3951	432	if (agsizechanged) {
1da177e4 LT	433	if ((rc = diExtendFS(ipimap, ipbmap)))
	434	goto error_out;
	435
	436	/* finalize imap */
	437	if ((rc = diSync(ipimap)))
	438	goto error_out;
	439	}
	440
	441	/*
f720e3ba DK	442	* finalize
f720e3ba DK	443	* --------
1da177e4 LT	444	*
	445	* extension is committed when on-disk super block is
	446	* updated with new descriptors: logredo will recover
	447	* crash before it to pre-extension state;
	448	*/
	449
	450	/* sync log to skip log replay of bmap file growth transaction; */
	451	/* lmLogSync(log, 1); */
	452
	453	/*
	454	* synchronous write bmap global control page;
	455	* for crash before completion of write
	456	* logredo() will recover to pre-extendfs state;
	457	* for crash after completion of write,
	458	* logredo() will recover post-extendfs state;
	459	*/
	460	if ((rc = dbSync(ipbmap)))
	461	goto error_out;
	462
	463	/*
	464	* copy primary bmap inode to secondary bmap inode
	465	*/
	466
	467	ipbmap2 = diReadSpecial(sb, BMAP_I, 1);
	468	if (ipbmap2 == NULL) {
	469	printk(KERN_ERR "jfs_extendfs: diReadSpecial(bmap) failed\n");
	470	goto error_out;
	471	}
	472	memcpy(&JFS_IP(ipbmap2)->i_xtroot, &JFS_IP(ipbmap)->i_xtroot, 288);
	473	ipbmap2->i_size = ipbmap->i_size;
	474	ipbmap2->i_blocks = ipbmap->i_blocks;
	475
	476	diWriteSpecial(ipbmap2, 1);
	477	diFreeSpecial(ipbmap2);
	478
	479	/*
f720e3ba	480	* update superblock
1da177e4 LT	481	*/
	482	if ((rc = readSuper(sb, &bh)))
	483	goto error_out;
	484	j_sb = (struct jfs_superblock *)bh->b_data;
	485
	486	/* mark extendfs() completion */
	487	j_sb->s_state &= cpu_to_le32(~FM_EXTENDFS);
	488	j_sb->s_size = cpu_to_le64(bmp->db_mapsize <<
	489	le16_to_cpu(j_sb->s_l2bfactor));
	490	j_sb->s_agsize = cpu_to_le32(bmp->db_agsize);
	491
	492	/* update inline log space descriptor */
	493	if (sbi->mntflag & JFS_INLINELOG) {
	494	PXDaddress(&(j_sb->s_logpxd), newLogAddress);
	495	PXDlength(&(j_sb->s_logpxd), newLogSize);
	496	}
	497
	498	/* record log's mount serial number */
	499	j_sb->s_logserial = cpu_to_le32(log->serial);
	500
	501	/* update fsck work space descriptor */
	502	PXDaddress(&(j_sb->s_fsckpxd), newFSCKAddress);
	503	PXDlength(&(j_sb->s_fsckpxd), newFSCKSize);
	504	j_sb->s_fscklog = 1;
	505	/* sb->s_fsckloglen remains the same */
	506
	507	/* Update secondary superblock */
	508	bh2 = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits);
	509	if (bh2) {
	510	j_sb2 = (struct jfs_superblock *)bh2->b_data;
	511	memcpy(j_sb2, j_sb, sizeof (struct jfs_superblock));
	512
	513	mark_buffer_dirty(bh);
	514	sync_dirty_buffer(bh2);
	515	brelse(bh2);
	516	}
	517
	518	/* write primary superblock */
	519	mark_buffer_dirty(bh);
	520	sync_dirty_buffer(bh);
	521	brelse(bh);
	522
	523	goto resume;
	524
	525	error_out:
eb8630d7	526	jfs_error(sb, "\n");
1da177e4 LT	527
	528	resume:
	529	/*
f720e3ba	530	* resume file system transactions
1da177e4 LT	531	*/
	532	txResume(sb);
	533
	534	out:
	535	return rc;
	536	}