[linux-2.6-block.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 = i_size_read(sb->s_bdev->bd_inode) >> 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 =  i_size_read(sb->s_bdev->bd_inode);

	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
684666e5	89	VolumeSize = i_size_read(sb->s_bdev->bd_inode) >> sb->s_blocksize_bits;
1da177e4 LT	90
	91	if (VolumeSize) {
	92	if (newLVSize > VolumeSize) {
	93	printk(KERN_WARNING "jfs_extendfs: invalid size\n");
	94	rc = -EINVAL;
	95	goto out;
	96	}
	97	} else {
	98	/* check the device */
	99	bh = sb_bread(sb, newLVSize - 1);
	100	if (!bh) {
	101	printk(KERN_WARNING "jfs_extendfs: invalid size\n");
	102	rc = -EINVAL;
	103	goto out;
	104	}
	105	bforget(bh);
	106	}
	107
	108	/* Can't extend write-protected drive */
	109
	110	if (isReadOnly(ipbmap)) {
	111	printk(KERN_WARNING "jfs_extendfs: read-only file system\n");
	112	rc = -EROFS;
	113	goto out;
	114	}
	115
	116	/*
f720e3ba DK	117	* reconfigure LV spaces
f720e3ba DK	118	* ---------------------
1da177e4 LT	119	*
	120	* validate new size, or, if not specified, determine new size
	121	*/
	122
	123	/*
	124	* reconfigure inline log space:
	125	*/
	126	if ((sbi->mntflag & JFS_INLINELOG)) {
	127	if (newLogSize == 0) {
	128	/*
	129	* no size specified: default to 1/256 of aggregate
	130	* size; rounded up to a megabyte boundary;
	131	*/
	132	newLogSize = newLVSize >> 8;
	133	t32 = (1 << (20 - sbi->l2bsize)) - 1;
	134	newLogSize = (newLogSize + t32) & ~t32;
	135	newLogSize =
	136	min(newLogSize, MEGABYTE32 >> sbi->l2bsize);
	137	} else {
	138	/*
	139	* convert the newLogSize to fs blocks.
	140	*
	141	* Since this is given in megabytes, it will always be
	142	* an even number of pages.
	143	*/
	144	newLogSize = (newLogSize * MEGABYTE) >> sbi->l2bsize;
	145	}
	146
	147	} else
	148	newLogSize = 0;
	149
	150	newLogAddress = newLVSize - newLogSize;
	151
	152	/*
	153	* reconfigure fsck work space:
	154	*
	155	* configure it to the end of the logical volume regardless of
	156	* whether file system extends to the end of the aggregate;
	157	* Need enough 4k pages to cover:
	158	* - 1 bit per block in aggregate rounded up to BPERDMAP boundary
	159	* - 1 extra page to handle control page and intermediate level pages
	160	* - 50 extra pages for the chkdsk service log
	161	*/
	162	t64 = ((newLVSize - newLogSize + BPERDMAP - 1) >> L2BPERDMAP)
	163	<< L2BPERDMAP;
a7fe0ba7	164	t32 = DIV_ROUND_UP(t64, BITSPERPAGE) + 1 + 50;
1da177e4 LT	165	newFSCKSize = t32 << sbi->l2nbperpage;
	166	newFSCKAddress = newLogAddress - newFSCKSize;
	167
	168	/*
	169	* compute new file system space;
	170	*/
	171	newFSSize = newLVSize - newLogSize - newFSCKSize;
	172
25985edc	173	/* file system cannot be shrunk */
1da177e4 LT	174	if (newFSSize < bmp->db_mapsize) {
	175	rc = -EINVAL;
	176	goto out;
	177	}
	178
	179	/*
	180	* If we're expanding enough that the inline log does not overlap
	181	* the old one, we can format the new log before we quiesce the
	182	* filesystem.
	183	*/
	184	if ((sbi->mntflag & JFS_INLINELOG) && (newLogAddress > oldLVSize)) {
	185	if ((rc = lmLogFormat(log, newLogAddress, newLogSize)))
	186	goto out;
	187	log_formatted = 1;
	188	}
	189	/*
f720e3ba	190	* quiesce file system
1da177e4 LT	191	*
	192	* (prepare to move the inline log and to prevent map update)
	193	*
	194	* block any new transactions and wait for completion of
	195	* all wip transactions and flush modified pages s.t.
	196	* on-disk file system is in consistent state and
	197	* log is not required for recovery.
	198	*/
	199	txQuiesce(sb);
	200
7fab479b	201	/* Reset size of direct inode */
684666e5	202	sbi->direct_inode->i_size = i_size_read(sb->s_bdev->bd_inode);
7fab479b	203
1da177e4 LT	204	if (sbi->mntflag & JFS_INLINELOG) {
	205	/*
	206	* deactivate old inline log
	207	*/
	208	lmLogShutdown(log);
	209
	210	/*
	211	* mark on-disk super block for fs in transition;
	212	*
	213	* update on-disk superblock for the new space configuration
	214	* of inline log space and fsck work space descriptors:
	215	* N.B. FS descriptor is NOT updated;
	216	*
	217	* crash recovery:
	218	* logredo(): if FM_EXTENDFS, return to fsck() for cleanup;
	219	* fsck(): if FM_EXTENDFS, reformat inline log and fsck
	220	* workspace from superblock inline log descriptor and fsck
	221	* workspace descriptor;
	222	*/
	223
	224	/* read in superblock */
	225	if ((rc = readSuper(sb, &bh)))
	226	goto error_out;
	227	j_sb = (struct jfs_superblock *)bh->b_data;
	228
	229	/* mark extendfs() in progress */
	230	j_sb->s_state \|= cpu_to_le32(FM_EXTENDFS);
	231	j_sb->s_xsize = cpu_to_le64(newFSSize);
	232	PXDaddress(&j_sb->s_xfsckpxd, newFSCKAddress);
	233	PXDlength(&j_sb->s_xfsckpxd, newFSCKSize);
	234	PXDaddress(&j_sb->s_xlogpxd, newLogAddress);
	235	PXDlength(&j_sb->s_xlogpxd, newLogSize);
	236
	237	/* synchronously update superblock */
	238	mark_buffer_dirty(bh);
	239	sync_dirty_buffer(bh);
	240	brelse(bh);
	241
	242	/*
	243	* format new inline log synchronously;
	244	*
	245	* crash recovery: if log move in progress,
	246	* reformat log and exit success;
	247	*/
	248	if (!log_formatted)
	249	if ((rc = lmLogFormat(log, newLogAddress, newLogSize)))
	250	goto error_out;
	251
	252	/*
	253	* activate new log
	254	*/
	255	log->base = newLogAddress;
	256	log->size = newLogSize >> (L2LOGPSIZE - sb->s_blocksize_bits);
	257	if ((rc = lmLogInit(log)))
	258	goto error_out;
	259	}
	260
	261	/*
f720e3ba DK	262	* extend block allocation map
f720e3ba DK	263	* ---------------------------
1da177e4 LT	264	*
	265	* extendfs() for new extension, retry after crash recovery;
	266	*
	267	* note: both logredo() and fsck() rebuild map from
	268	* the bitmap and configuration parameter from superblock
	269	* (disregarding all other control information in the map);
	270	*
	271	* superblock:
	272	* s_size: aggregate size in physical blocks;
	273	*/
	274	/*
f720e3ba	275	* compute the new block allocation map configuration
1da177e4 LT	276	*
	277	* map dinode:
	278	* di_size: map file size in byte;
	279	* di_nblocks: number of blocks allocated for map file;
	280	* di_mapsize: number of blocks in aggregate (covered by map);
	281	* map control page:
	282	* db_mapsize: number of blocks in aggregate (covered by map);
	283	*/
	284	newMapSize = newFSSize;
	285	/* number of data pages of new bmap file:
	286	* roundup new size to full dmap page boundary and
	287	* add 1 extra dmap page for next extendfs()
	288	*/
	289	t64 = (newMapSize - 1) + BPERDMAP;
	290	newNpages = BLKTODMAPN(t64) + 1;
	291
	292	/*
f720e3ba	293	* extend map from current map (WITHOUT growing mapfile)
1da177e4 LT	294	*
	295	* map new extension with unmapped part of the last partial
	296	* dmap page, if applicable, and extra page(s) allocated
	297	* at end of bmap by mkfs() or previous extendfs();
	298	*/
	299	extendBmap:
	300	/* compute number of blocks requested to extend */
	301	mapSize = bmp->db_mapsize;
	302	XAddress = mapSize; /* eXtension Address */
	303	XSize = newMapSize - mapSize; /* eXtension Size */
	304	old_agsize = bmp->db_agsize; /* We need to know if this changes */
	305
	306	/* compute number of blocks that can be extended by current mapfile */
	307	t64 = dbMapFileSizeToMapSize(ipbmap);
	308	if (mapSize > t64) {
	309	printk(KERN_ERR "jfs_extendfs: mapSize (0x%Lx) > t64 (0x%Lx)\n",
	310	(long long) mapSize, (long long) t64);
	311	rc = -EIO;
	312	goto error_out;
	313	}
	314	nblocks = min(t64 - mapSize, XSize);
	315
	316	/*
	317	* update map pages for new extension:
	318	*
	319	* update/init dmap and bubble up the control hierarchy
	320	* incrementally fold up dmaps into upper levels;
	321	* update bmap control page;
	322	*/
	323	if ((rc = dbExtendFS(ipbmap, XAddress, nblocks)))
	324	goto error_out;
2b0b3951 BP	325
	326	agsizechanged \|= (bmp->db_agsize != old_agsize);
	327
1da177e4 LT	328	/*
	329	* the map now has extended to cover additional nblocks:
	330	* dn_mapsize = oldMapsize + nblocks;
	331	*/
	332	/* ipbmap->i_mapsize += nblocks; */
	333	XSize -= nblocks;
	334
	335	/*
f720e3ba DK	336	* grow map file to cover remaining extension
f720e3ba DK	337	* and/or one extra dmap page for next extendfs();
1da177e4 LT	338	*
	339	* allocate new map pages and its backing blocks, and
	340	* update map file xtree
	341	*/
	342	/* compute number of data pages of current bmap file */
	343	nPages = ipbmap->i_size >> L2PSIZE;
	344
	345	/* need to grow map file ? */
	346	if (nPages == newNpages)
	347	goto finalizeBmap;
	348
	349	/*
	350	* grow bmap file for the new map pages required:
	351	*
	352	* allocate growth at the start of newly extended region;
	353	* bmap file only grows sequentially, i.e., both data pages
	354	* and possibly xtree index pages may grow in append mode,
	355	* s.t. logredo() can reconstruct pre-extension state
	356	* by washing away bmap file of pages outside s_size boundary;
	357	*/
	358	/*
	359	* journal map file growth as if a regular file growth:
	360	* (note: bmap is created with di_mode = IFJOURNAL\|IFREG);
	361	*
	362	* journaling of bmap file growth is not required since
	363	* logredo() do/can not use log records of bmap file growth
	364	* but it provides careful write semantics, pmap update, etc.;
	365	*/
	366	/* synchronous write of data pages: bmap data pages are
	367	* cached in meta-data cache, and not written out
	368	* by txCommit();
	369	*/
7cfcd8b7 QL	370	rc = filemap_fdatawait(ipbmap->i_mapping);
	371	if (rc)
	372	goto error_out;
	373
	374	rc = filemap_write_and_wait(ipbmap->i_mapping);
	375	if (rc)
	376	goto error_out;
	377
1da177e4 LT	378	diWriteSpecial(ipbmap, 0);
	379
	380	newPage = nPages; /* first new page number */
	381	xoff = newPage << sbi->l2nbperpage;
	382	xlen = (newNpages - nPages) << sbi->l2nbperpage;
	383	xlen = min(xlen, (int) nblocks) & ~(sbi->nbperpage - 1);
	384	xaddr = XAddress;
	385
	386	tid = txBegin(sb, COMMIT_FORCE);
	387
	388	if ((rc = xtAppend(tid, ipbmap, 0, xoff, nblocks, &xlen, &xaddr, 0))) {
	389	txEnd(tid);
	390	goto error_out;
	391	}
	392	/* update bmap file size */
	393	ipbmap->i_size += xlen << sbi->l2bsize;
	394	inode_add_bytes(ipbmap, xlen << sbi->l2bsize);
	395
	396	iplist[0] = ipbmap;
	397	rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
	398
	399	txEnd(tid);
	400
	401	if (rc)
	402	goto error_out;
	403
	404	/*
	405	* map file has been grown now to cover extension to further out;
	406	* di_size = new map file size;
	407	*
	408	* if huge extension, the previous extension based on previous
	409	* map file size may not have been sufficient to cover whole extension
	410	* (it could have been used up for new map pages),
	411	* but the newly grown map file now covers lot bigger new free space
	412	* available for further extension of map;
	413	*/
	414	/* any more blocks to extend ? */
	415	if (XSize)
	416	goto extendBmap;
	417
	418	finalizeBmap:
	419	/* finalize bmap */
	420	dbFinalizeBmap(ipbmap);
	421
	422	/*
f720e3ba DK	423	* update inode allocation map
f720e3ba DK	424	* ---------------------------
1da177e4 LT	425	*
	426	* move iag lists from old to new iag;
	427	* agstart field is not updated for logredo() to reconstruct
	428	* iag lists if system crash occurs.
	429	* (computation of ag number from agstart based on agsize
	430	* will correctly identify the new ag);
	431	*/
	432	/* if new AG size the same as old AG size, done! */
2b0b3951	433	if (agsizechanged) {
1da177e4 LT	434	if ((rc = diExtendFS(ipimap, ipbmap)))
	435	goto error_out;
	436
	437	/* finalize imap */
	438	if ((rc = diSync(ipimap)))
	439	goto error_out;
	440	}
	441
	442	/*
f720e3ba DK	443	* finalize
f720e3ba DK	444	* --------
1da177e4 LT	445	*
	446	* extension is committed when on-disk super block is
	447	* updated with new descriptors: logredo will recover
	448	* crash before it to pre-extension state;
	449	*/
	450
	451	/* sync log to skip log replay of bmap file growth transaction; */
	452	/* lmLogSync(log, 1); */
	453
	454	/*
	455	* synchronous write bmap global control page;
	456	* for crash before completion of write
	457	* logredo() will recover to pre-extendfs state;
	458	* for crash after completion of write,
	459	* logredo() will recover post-extendfs state;
	460	*/
	461	if ((rc = dbSync(ipbmap)))
	462	goto error_out;
	463
	464	/*
	465	* copy primary bmap inode to secondary bmap inode
	466	*/
	467
	468	ipbmap2 = diReadSpecial(sb, BMAP_I, 1);
	469	if (ipbmap2 == NULL) {
	470	printk(KERN_ERR "jfs_extendfs: diReadSpecial(bmap) failed\n");
	471	goto error_out;
	472	}
	473	memcpy(&JFS_IP(ipbmap2)->i_xtroot, &JFS_IP(ipbmap)->i_xtroot, 288);
	474	ipbmap2->i_size = ipbmap->i_size;
	475	ipbmap2->i_blocks = ipbmap->i_blocks;
	476
	477	diWriteSpecial(ipbmap2, 1);
	478	diFreeSpecial(ipbmap2);
	479
	480	/*
f720e3ba	481	* update superblock
1da177e4 LT	482	*/
	483	if ((rc = readSuper(sb, &bh)))
	484	goto error_out;
	485	j_sb = (struct jfs_superblock *)bh->b_data;
	486
	487	/* mark extendfs() completion */
	488	j_sb->s_state &= cpu_to_le32(~FM_EXTENDFS);
	489	j_sb->s_size = cpu_to_le64(bmp->db_mapsize <<
	490	le16_to_cpu(j_sb->s_l2bfactor));
	491	j_sb->s_agsize = cpu_to_le32(bmp->db_agsize);
	492
	493	/* update inline log space descriptor */
	494	if (sbi->mntflag & JFS_INLINELOG) {
	495	PXDaddress(&(j_sb->s_logpxd), newLogAddress);
	496	PXDlength(&(j_sb->s_logpxd), newLogSize);
	497	}
	498
	499	/* record log's mount serial number */
	500	j_sb->s_logserial = cpu_to_le32(log->serial);
	501
	502	/* update fsck work space descriptor */
	503	PXDaddress(&(j_sb->s_fsckpxd), newFSCKAddress);
	504	PXDlength(&(j_sb->s_fsckpxd), newFSCKSize);
	505	j_sb->s_fscklog = 1;
	506	/* sb->s_fsckloglen remains the same */
	507
	508	/* Update secondary superblock */
	509	bh2 = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits);
	510	if (bh2) {
	511	j_sb2 = (struct jfs_superblock *)bh2->b_data;
	512	memcpy(j_sb2, j_sb, sizeof (struct jfs_superblock));
	513
	514	mark_buffer_dirty(bh);
	515	sync_dirty_buffer(bh2);
	516	brelse(bh2);
	517	}
	518
	519	/* write primary superblock */
	520	mark_buffer_dirty(bh);
	521	sync_dirty_buffer(bh);
	522	brelse(bh);
	523
	524	goto resume;
	525
	526	error_out:
eb8630d7	527	jfs_error(sb, "\n");
1da177e4 LT	528
	529	resume:
	530	/*
f720e3ba	531	* resume file system transactions
1da177e4 LT	532	*/
	533	txResume(sb);
	534
	535	out:
	536	return rc;
	537	}