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

/*
 *   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
 */

/*
 * Module: jfs_mount.c
 *
 * note: file system in transition to aggregate/fileset:
 *
 * file system mount is interpreted as the mount of aggregate,
 * if not already mounted, and mount of the single/only fileset in
 * the aggregate;
 *
 * a file system/aggregate is represented by an internal inode
 * (aka mount inode) initialized with aggregate superblock;
 * each vfs represents a fileset, and points to its "fileset inode
 * allocation map inode" (aka fileset inode):
 * (an aggregate itself is structured recursively as a filset:
 * an internal vfs is constructed and points to its "fileset inode
 * allocation map inode" (aka aggregate inode) where each inode
 * represents a fileset inode) so that inode number is mapped to
 * on-disk inode in uniform way at both aggregate and fileset level;
 *
 * each vnode/inode of a fileset is linked to its vfs (to facilitate
 * per fileset inode operations, e.g., unmount of a fileset, etc.);
 * each inode points to the mount inode (to facilitate access to
 * per aggregate information, e.g., block size, etc.) as well as
 * its file set inode.
 *
 *   aggregate
 *   ipmnt
 *   mntvfs -> fileset ipimap+ -> aggregate ipbmap -> aggregate ipaimap;
 *             fileset vfs     -> vp(1) <-> ... <-> vp(n) <->vproot;
 */

#include <linux/fs.h>
#include <linux/buffer_head.h>

#include "jfs_incore.h"
#include "jfs_filsys.h"
#include "jfs_superblock.h"
#include "jfs_dmap.h"
#include "jfs_imap.h"
#include "jfs_metapage.h"
#include "jfs_debug.h"


/*
 * forward references
 */
static int chkSuper(struct super_block *);
static int logMOUNT(struct super_block *sb);

/*
 * NAME:	jfs_mount(sb)
 *
 * FUNCTION:	vfs_mount()
 *
 * PARAMETER:	sb	- super block
 *
 * RETURN:	-EBUSY	- device already mounted or open for write
 *		-EBUSY	- cvrdvp already mounted;
 *		-EBUSY	- mount table full
 *		-ENOTDIR- cvrdvp not directory on a device mount
 *		-ENXIO	- device open failure
 */
int jfs_mount(struct super_block *sb)
{
	int rc = 0;		/* Return code */
	struct jfs_sb_info *sbi = JFS_SBI(sb);
	struct inode *ipaimap = NULL;
	struct inode *ipaimap2 = NULL;
	struct inode *ipimap = NULL;
	struct inode *ipbmap = NULL;

	/*
	 * read/validate superblock
	 * (initialize mount inode from the superblock)
	 */
	if ((rc = chkSuper(sb))) {
		goto errout20;
	}

	ipaimap = diReadSpecial(sb, AGGREGATE_I, 0);
	if (ipaimap == NULL) {
		jfs_err("jfs_mount: Failed to read AGGREGATE_I");
		rc = -EIO;
		goto errout20;
	}
	sbi->ipaimap = ipaimap;

	jfs_info("jfs_mount: ipaimap:0x%p", ipaimap);

	/*
	 * initialize aggregate inode allocation map
	 */
	if ((rc = diMount(ipaimap))) {
		jfs_err("jfs_mount: diMount(ipaimap) failed w/rc = %d", rc);
		goto errout21;
	}

	/*
	 * open aggregate block allocation map
	 */
	ipbmap = diReadSpecial(sb, BMAP_I, 0);
	if (ipbmap == NULL) {
		rc = -EIO;
		goto errout22;
	}

	jfs_info("jfs_mount: ipbmap:0x%p", ipbmap);

	sbi->ipbmap = ipbmap;

	/*
	 * initialize aggregate block allocation map
	 */
	if ((rc = dbMount(ipbmap))) {
		jfs_err("jfs_mount: dbMount failed w/rc = %d", rc);
		goto errout22;
	}

	/*
	 * open the secondary aggregate inode allocation map
	 *
	 * This is a duplicate of the aggregate inode allocation map.
	 *
	 * hand craft a vfs in the same fashion as we did to read ipaimap.
	 * By adding INOSPEREXT (32) to the inode number, we are telling
	 * diReadSpecial that we are reading from the secondary aggregate
	 * inode table.  This also creates a unique entry in the inode hash
	 * table.
	 */
	if ((sbi->mntflag & JFS_BAD_SAIT) == 0) {
		ipaimap2 = diReadSpecial(sb, AGGREGATE_I, 1);
		if (!ipaimap2) {
			jfs_err("jfs_mount: Failed to read AGGREGATE_I");
			rc = -EIO;
			goto errout35;
		}
		sbi->ipaimap2 = ipaimap2;

		jfs_info("jfs_mount: ipaimap2:0x%p", ipaimap2);

		/*
		 * initialize secondary aggregate inode allocation map
		 */
		if ((rc = diMount(ipaimap2))) {
			jfs_err("jfs_mount: diMount(ipaimap2) failed, rc = %d",
				rc);
			goto errout35;
		}
	} else
		/* Secondary aggregate inode table is not valid */
		sbi->ipaimap2 = NULL;

	/*
	 *	mount (the only/single) fileset
	 */
	/*
	 * open fileset inode allocation map (aka fileset inode)
	 */
	ipimap = diReadSpecial(sb, FILESYSTEM_I, 0);
	if (ipimap == NULL) {
		jfs_err("jfs_mount: Failed to read FILESYSTEM_I");
		/* open fileset secondary inode allocation map */
		rc = -EIO;
		goto errout40;
	}
	jfs_info("jfs_mount: ipimap:0x%p", ipimap);

	/* map further access of per fileset inodes by the fileset inode */
	sbi->ipimap = ipimap;

	/* initialize fileset inode allocation map */
	if ((rc = diMount(ipimap))) {
		jfs_err("jfs_mount: diMount failed w/rc = %d", rc);
		goto errout41;
	}

	goto out;

	/*
	 *	unwind on error
	 */
      errout41:		/* close fileset inode allocation map inode */
	diFreeSpecial(ipimap);

      errout40:		/* fileset closed */

	/* close secondary aggregate inode allocation map */
	if (ipaimap2) {
		diUnmount(ipaimap2, 1);
		diFreeSpecial(ipaimap2);
	}

      errout35:

	/* close aggregate block allocation map */
	dbUnmount(ipbmap, 1);
	diFreeSpecial(ipbmap);

      errout22:		/* close aggregate inode allocation map */

	diUnmount(ipaimap, 1);

      errout21:		/* close aggregate inodes */
	diFreeSpecial(ipaimap);
      errout20:		/* aggregate closed */

      out:

	if (rc)
		jfs_err("Mount JFS Failure: %d", rc);

	return rc;
}

/*
 * NAME:	jfs_mount_rw(sb, remount)
 *
 * FUNCTION:	Completes read-write mount, or remounts read-only volume
 *		as read-write
 */
int jfs_mount_rw(struct super_block *sb, int remount)
{
	struct jfs_sb_info *sbi = JFS_SBI(sb);
	int rc;

	/*
	 * If we are re-mounting a previously read-only volume, we want to
	 * re-read the inode and block maps, since fsck.jfs may have updated
	 * them.
	 */
	if (remount) {
		if (chkSuper(sb) || (sbi->state != FM_CLEAN))
			return -EINVAL;

		truncate_inode_pages(sbi->ipimap->i_mapping, 0);
		truncate_inode_pages(sbi->ipbmap->i_mapping, 0);
		diUnmount(sbi->ipimap, 1);
		if ((rc = diMount(sbi->ipimap))) {
			jfs_err("jfs_mount_rw: diMount failed!");
			return rc;
		}

		dbUnmount(sbi->ipbmap, 1);
		if ((rc = dbMount(sbi->ipbmap))) {
			jfs_err("jfs_mount_rw: dbMount failed!");
			return rc;
		}
	}

	/*
	 * open/initialize log
	 */
	if ((rc = lmLogOpen(sb)))
		return rc;

	/*
	 * update file system superblock;
	 */
	if ((rc = updateSuper(sb, FM_MOUNT))) {
		jfs_err("jfs_mount: updateSuper failed w/rc = %d", rc);
		lmLogClose(sb);
		return rc;
	}

	/*
	 * write MOUNT log record of the file system
	 */
	logMOUNT(sb);

	return rc;
}

/*
 *	chkSuper()
 *
 * validate the superblock of the file system to be mounted and
 * get the file system parameters.
 *
 * returns
 *	0 with fragsize set if check successful
 *	error code if not successful
 */
static int chkSuper(struct super_block *sb)
{
	int rc = 0;
	struct jfs_sb_info *sbi = JFS_SBI(sb);
	struct jfs_superblock *j_sb;
	struct buffer_head *bh;
	int AIM_bytesize, AIT_bytesize;
	int expected_AIM_bytesize, expected_AIT_bytesize;
	s64 AIM_byte_addr, AIT_byte_addr, fsckwsp_addr;
	s64 byte_addr_diff0, byte_addr_diff1;
	s32 bsize;

	if ((rc = readSuper(sb, &bh)))
		return rc;
	j_sb = (struct jfs_superblock *)bh->b_data;

	/*
	 * validate superblock
	 */
	/* validate fs signature */
	if (strncmp(j_sb->s_magic, JFS_MAGIC, 4) ||
	    le32_to_cpu(j_sb->s_version) > JFS_VERSION) {
		rc = -EINVAL;
		goto out;
	}

	bsize = le32_to_cpu(j_sb->s_bsize);
#ifdef _JFS_4K
	if (bsize != PSIZE) {
		jfs_err("Currently only 4K block size supported!");
		rc = -EINVAL;
		goto out;
	}
#endif				/* _JFS_4K */

	jfs_info("superblock: flag:0x%08x state:0x%08x size:0x%Lx",
		 le32_to_cpu(j_sb->s_flag), le32_to_cpu(j_sb->s_state),
		 (unsigned long long) le64_to_cpu(j_sb->s_size));

	/* validate the descriptors for Secondary AIM and AIT */
	if ((j_sb->s_flag & cpu_to_le32(JFS_BAD_SAIT)) !=
	    cpu_to_le32(JFS_BAD_SAIT)) {
		expected_AIM_bytesize = 2 * PSIZE;
		AIM_bytesize = lengthPXD(&(j_sb->s_aim2)) * bsize;
		expected_AIT_bytesize = 4 * PSIZE;
		AIT_bytesize = lengthPXD(&(j_sb->s_ait2)) * bsize;
		AIM_byte_addr = addressPXD(&(j_sb->s_aim2)) * bsize;
		AIT_byte_addr = addressPXD(&(j_sb->s_ait2)) * bsize;
		byte_addr_diff0 = AIT_byte_addr - AIM_byte_addr;
		fsckwsp_addr = addressPXD(&(j_sb->s_fsckpxd)) * bsize;
		byte_addr_diff1 = fsckwsp_addr - AIT_byte_addr;
		if ((AIM_bytesize != expected_AIM_bytesize) ||
		    (AIT_bytesize != expected_AIT_bytesize) ||
		    (byte_addr_diff0 != AIM_bytesize) ||
		    (byte_addr_diff1 <= AIT_bytesize))
			j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT);
	}

	if ((j_sb->s_flag & cpu_to_le32(JFS_GROUPCOMMIT)) !=
	    cpu_to_le32(JFS_GROUPCOMMIT))
		j_sb->s_flag |= cpu_to_le32(JFS_GROUPCOMMIT);

	/* validate fs state */
	if (j_sb->s_state != cpu_to_le32(FM_CLEAN) &&
	    !sb_rdonly(sb)) {
		jfs_err("jfs_mount: Mount Failure: File System Dirty.");
		rc = -EINVAL;
		goto out;
	}

	sbi->state = le32_to_cpu(j_sb->s_state);
	sbi->mntflag = le32_to_cpu(j_sb->s_flag);

	/*
	 * JFS always does I/O by 4K pages.  Don't tell the buffer cache
	 * that we use anything else (leave s_blocksize alone).
	 */
	sbi->bsize = bsize;
	sbi->l2bsize = le16_to_cpu(j_sb->s_l2bsize);

	/*
	 * For now, ignore s_pbsize, l2bfactor.  All I/O going through buffer
	 * cache.
	 */
	sbi->nbperpage = PSIZE >> sbi->l2bsize;
	sbi->l2nbperpage = L2PSIZE - sbi->l2bsize;
	sbi->l2niperblk = sbi->l2bsize - L2DISIZE;
	if (sbi->mntflag & JFS_INLINELOG)
		sbi->logpxd = j_sb->s_logpxd;
	else {
		sbi->logdev = new_decode_dev(le32_to_cpu(j_sb->s_logdev));
		memcpy(sbi->uuid, j_sb->s_uuid, sizeof(sbi->uuid));
		memcpy(sbi->loguuid, j_sb->s_loguuid, sizeof(sbi->uuid));
	}
	sbi->fsckpxd = j_sb->s_fsckpxd;
	sbi->ait2 = j_sb->s_ait2;

      out:
	brelse(bh);
	return rc;
}


/*
 *	updateSuper()
 *
 * update synchronously superblock if it is mounted read-write.
 */
int updateSuper(struct super_block *sb, uint state)
{
	struct jfs_superblock *j_sb;
	struct jfs_sb_info *sbi = JFS_SBI(sb);
	struct buffer_head *bh;
	int rc;

	if (sbi->flag & JFS_NOINTEGRITY) {
		if (state == FM_DIRTY) {
			sbi->p_state = state;
			return 0;
		} else if (state == FM_MOUNT) {
			sbi->p_state = sbi->state;
			state = FM_DIRTY;
		} else if (state == FM_CLEAN) {
			state = sbi->p_state;
		} else
			jfs_err("updateSuper: bad state");
	} else if (sbi->state == FM_DIRTY)
		return 0;

	if ((rc = readSuper(sb, &bh)))
		return rc;

	j_sb = (struct jfs_superblock *)bh->b_data;

	j_sb->s_state = cpu_to_le32(state);
	sbi->state = state;

	if (state == FM_MOUNT) {
		/* record log's dev_t and mount serial number */
		j_sb->s_logdev = cpu_to_le32(new_encode_dev(sbi->log->bdev->bd_dev));
		j_sb->s_logserial = cpu_to_le32(sbi->log->serial);
	} else if (state == FM_CLEAN) {
		/*
		 * If this volume is shared with OS/2, OS/2 will need to
		 * recalculate DASD usage, since we don't deal with it.
		 */
		if (j_sb->s_flag & cpu_to_le32(JFS_DASD_ENABLED))
			j_sb->s_flag |= cpu_to_le32(JFS_DASD_PRIME);
	}

	mark_buffer_dirty(bh);
	sync_dirty_buffer(bh);
	brelse(bh);

	return 0;
}


/*
 *	readSuper()
 *
 * read superblock by raw sector address
 */
int readSuper(struct super_block *sb, struct buffer_head **bpp)
{
	/* read in primary superblock */
	*bpp = sb_bread(sb, SUPER1_OFF >> sb->s_blocksize_bits);
	if (*bpp)
		return 0;

	/* read in secondary/replicated superblock */
	*bpp = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits);
	if (*bpp)
		return 0;

	return -EIO;
}


/*
 *	logMOUNT()
 *
 * function: write a MOUNT log record for file system.
 *
 * MOUNT record keeps logredo() from processing log records
 * for this file system past this point in log.
 * it is harmless if mount fails.
 *
 * note: MOUNT record is at aggregate level, not at fileset level,
 * since log records of previous mounts of a fileset
 * (e.g., AFTER record of extent allocation) have to be processed
 * to update block allocation map at aggregate level.
 */
static int logMOUNT(struct super_block *sb)
{
	struct jfs_log *log = JFS_SBI(sb)->log;
	struct lrd lrd;

	lrd.logtid = 0;
	lrd.backchain = 0;
	lrd.type = cpu_to_le16(LOG_MOUNT);
	lrd.length = 0;
	lrd.aggregate = cpu_to_le32(new_encode_dev(sb->s_bdev->bd_dev));
	lmLog(log, NULL, &lrd, NULL);

	return 0;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (C) International Business Machines Corp., 2000-2004
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
63f83c9f	6	* the Free Software Foundation; either version 2 of the License, or
1da177e4	7	* (at your option) any later version.
63f83c9f	8	*
1da177e4 LT	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	12	* the GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
63f83c9f	15	* along with this program; if not, write to the Free Software
1da177e4 LT	16	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	17	*/
	18
	19	/*
	20	* Module: jfs_mount.c
	21	*
	22	* note: file system in transition to aggregate/fileset:
	23	*
63f83c9f DK	24	* file system mount is interpreted as the mount of aggregate,
63f83c9f DK	25	* if not already mounted, and mount of the single/only fileset in
1da177e4 LT	26	* the aggregate;
	27	*
	28	* a file system/aggregate is represented by an internal inode
	29	* (aka mount inode) initialized with aggregate superblock;
63f83c9f	30	* each vfs represents a fileset, and points to its "fileset inode
1da177e4	31	* allocation map inode" (aka fileset inode):
63f83c9f DK	32	* (an aggregate itself is structured recursively as a filset:
	33	* an internal vfs is constructed and points to its "fileset inode
	34	* allocation map inode" (aka aggregate inode) where each inode
	35	* represents a fileset inode) so that inode number is mapped to
1da177e4 LT	36	* on-disk inode in uniform way at both aggregate and fileset level;
	37	*
	38	* each vnode/inode of a fileset is linked to its vfs (to facilitate
	39	* per fileset inode operations, e.g., unmount of a fileset, etc.);
	40	* each inode points to the mount inode (to facilitate access to
	41	* per aggregate information, e.g., block size, etc.) as well as
	42	* its file set inode.
	43	*
63f83c9f	44	* aggregate
1da177e4 LT	45	* ipmnt
	46	* mntvfs -> fileset ipimap+ -> aggregate ipbmap -> aggregate ipaimap;
	47	* fileset vfs -> vp(1) <-> ... <-> vp(n) <->vproot;
	48	*/
	49
	50	#include <linux/fs.h>
	51	#include <linux/buffer_head.h>
	52
	53	#include "jfs_incore.h"
	54	#include "jfs_filsys.h"
	55	#include "jfs_superblock.h"
	56	#include "jfs_dmap.h"
	57	#include "jfs_imap.h"
	58	#include "jfs_metapage.h"
	59	#include "jfs_debug.h"
	60
	61
	62	/*
	63	* forward references
	64	*/
	65	static int chkSuper(struct super_block *);
	66	static int logMOUNT(struct super_block *sb);
	67
	68	/*
	69	* NAME: jfs_mount(sb)
	70	*
	71	* FUNCTION: vfs_mount()
	72	*
	73	* PARAMETER: sb - super block
	74	*
	75	* RETURN: -EBUSY - device already mounted or open for write
	76	* -EBUSY - cvrdvp already mounted;
	77	* -EBUSY - mount table full
	78	* -ENOTDIR- cvrdvp not directory on a device mount
	79	* -ENXIO - device open failure
	80	*/
	81	int jfs_mount(struct super_block *sb)
	82	{
f720e3ba	83	int rc = 0; /* Return code */
1da177e4 LT	84	struct jfs_sb_info *sbi = JFS_SBI(sb);
	85	struct inode *ipaimap = NULL;
	86	struct inode *ipaimap2 = NULL;
	87	struct inode *ipimap = NULL;
	88	struct inode *ipbmap = NULL;
	89
	90	/*
63f83c9f	91	* read/validate superblock
1da177e4 LT	92	* (initialize mount inode from the superblock)
	93	*/
	94	if ((rc = chkSuper(sb))) {
	95	goto errout20;
	96	}
	97
	98	ipaimap = diReadSpecial(sb, AGGREGATE_I, 0);
	99	if (ipaimap == NULL) {
426d3107	100	jfs_err("jfs_mount: Failed to read AGGREGATE_I");
1da177e4 LT	101	rc = -EIO;
	102	goto errout20;
	103	}
	104	sbi->ipaimap = ipaimap;
	105
	106	jfs_info("jfs_mount: ipaimap:0x%p", ipaimap);
	107
	108	/*
	109	* initialize aggregate inode allocation map
	110	*/
	111	if ((rc = diMount(ipaimap))) {
	112	jfs_err("jfs_mount: diMount(ipaimap) failed w/rc = %d", rc);
	113	goto errout21;
	114	}
	115
	116	/*
	117	* open aggregate block allocation map
	118	*/
	119	ipbmap = diReadSpecial(sb, BMAP_I, 0);
	120	if (ipbmap == NULL) {
	121	rc = -EIO;
	122	goto errout22;
	123	}
	124
	125	jfs_info("jfs_mount: ipbmap:0x%p", ipbmap);
	126
	127	sbi->ipbmap = ipbmap;
	128
	129	/*
	130	* initialize aggregate block allocation map
	131	*/
	132	if ((rc = dbMount(ipbmap))) {
	133	jfs_err("jfs_mount: dbMount failed w/rc = %d", rc);
	134	goto errout22;
	135	}
	136
	137	/*
	138	* open the secondary aggregate inode allocation map
	139	*
	140	* This is a duplicate of the aggregate inode allocation map.
	141	*
	142	* hand craft a vfs in the same fashion as we did to read ipaimap.
	143	* By adding INOSPEREXT (32) to the inode number, we are telling
	144	* diReadSpecial that we are reading from the secondary aggregate
	145	* inode table. This also creates a unique entry in the inode hash
	146	* table.
	147	*/
	148	if ((sbi->mntflag & JFS_BAD_SAIT) == 0) {
	149	ipaimap2 = diReadSpecial(sb, AGGREGATE_I, 1);
09aaa749	150	if (!ipaimap2) {
426d3107	151	jfs_err("jfs_mount: Failed to read AGGREGATE_I");
1da177e4 LT	152	rc = -EIO;
	153	goto errout35;
	154	}
	155	sbi->ipaimap2 = ipaimap2;
	156
	157	jfs_info("jfs_mount: ipaimap2:0x%p", ipaimap2);
	158
	159	/*
	160	* initialize secondary aggregate inode allocation map
	161	*/
	162	if ((rc = diMount(ipaimap2))) {
	163	jfs_err("jfs_mount: diMount(ipaimap2) failed, rc = %d",
	164	rc);
	165	goto errout35;
	166	}
	167	} else
	168	/* Secondary aggregate inode table is not valid */
	169	sbi->ipaimap2 = NULL;
	170
	171	/*
f720e3ba	172	* mount (the only/single) fileset
1da177e4 LT	173	*/
	174	/*
	175	* open fileset inode allocation map (aka fileset inode)
	176	*/
	177	ipimap = diReadSpecial(sb, FILESYSTEM_I, 0);
	178	if (ipimap == NULL) {
	179	jfs_err("jfs_mount: Failed to read FILESYSTEM_I");
	180	/* open fileset secondary inode allocation map */
	181	rc = -EIO;
	182	goto errout40;
	183	}
	184	jfs_info("jfs_mount: ipimap:0x%p", ipimap);
	185
	186	/* map further access of per fileset inodes by the fileset inode */
	187	sbi->ipimap = ipimap;
	188
	189	/* initialize fileset inode allocation map */
	190	if ((rc = diMount(ipimap))) {
	191	jfs_err("jfs_mount: diMount failed w/rc = %d", rc);
	192	goto errout41;
	193	}
	194
	195	goto out;
	196
	197	/*
f720e3ba	198	* unwind on error
1da177e4 LT	199	*/
	200	errout41: /* close fileset inode allocation map inode */
	201	diFreeSpecial(ipimap);
	202
	203	errout40: /* fileset closed */
	204
	205	/* close secondary aggregate inode allocation map */
	206	if (ipaimap2) {
	207	diUnmount(ipaimap2, 1);
	208	diFreeSpecial(ipaimap2);
	209	}
	210
	211	errout35:
	212
	213	/* close aggregate block allocation map */
	214	dbUnmount(ipbmap, 1);
	215	diFreeSpecial(ipbmap);
	216
	217	errout22: /* close aggregate inode allocation map */
	218
	219	diUnmount(ipaimap, 1);
	220
	221	errout21: /* close aggregate inodes */
	222	diFreeSpecial(ipaimap);
	223	errout20: /* aggregate closed */
	224
	225	out:
	226
	227	if (rc)
	228	jfs_err("Mount JFS Failure: %d", rc);
	229
	230	return rc;
	231	}
	232
	233	/*
	234	* NAME: jfs_mount_rw(sb, remount)
	235	*
	236	* FUNCTION: Completes read-write mount, or remounts read-only volume
	237	* as read-write
	238	*/
	239	int jfs_mount_rw(struct super_block *sb, int remount)
	240	{
63f83c9f	241	struct jfs_sb_info *sbi = JFS_SBI(sb);
1da177e4 LT	242	int rc;
	243
	244	/*
	245	* If we are re-mounting a previously read-only volume, we want to
	246	* re-read the inode and block maps, since fsck.jfs may have updated
	247	* them.
	248	*/
	249	if (remount) {
	250	if (chkSuper(sb) \|\| (sbi->state != FM_CLEAN))
	251	return -EINVAL;
	252
	253	truncate_inode_pages(sbi->ipimap->i_mapping, 0);
	254	truncate_inode_pages(sbi->ipbmap->i_mapping, 0);
	255	diUnmount(sbi->ipimap, 1);
	256	if ((rc = diMount(sbi->ipimap))) {
	257	jfs_err("jfs_mount_rw: diMount failed!");
	258	return rc;
	259	}
	260
	261	dbUnmount(sbi->ipbmap, 1);
	262	if ((rc = dbMount(sbi->ipbmap))) {
	263	jfs_err("jfs_mount_rw: dbMount failed!");
	264	return rc;
	265	}
	266	}
	267
	268	/*
	269	* open/initialize log
	270	*/
	271	if ((rc = lmLogOpen(sb)))
	272	return rc;
	273
	274	/*
	275	* update file system superblock;
	276	*/
	277	if ((rc = updateSuper(sb, FM_MOUNT))) {
	278	jfs_err("jfs_mount: updateSuper failed w/rc = %d", rc);
	279	lmLogClose(sb);
	280	return rc;
	281	}
	282
	283	/*
	284	* write MOUNT log record of the file system
	285	*/
	286	logMOUNT(sb);
	287
1da177e4 LT	288	return rc;
	289	}
	290
	291	/*
	292	* chkSuper()
	293	*
63f83c9f	294	* validate the superblock of the file system to be mounted and
1da177e4 LT	295	* get the file system parameters.
	296	*
	297	* returns
	298	* 0 with fragsize set if check successful
	299	* error code if not successful
	300	*/
	301	static int chkSuper(struct super_block *sb)
	302	{
	303	int rc = 0;
	304	struct jfs_sb_info *sbi = JFS_SBI(sb);
	305	struct jfs_superblock *j_sb;
	306	struct buffer_head *bh;
	307	int AIM_bytesize, AIT_bytesize;
	308	int expected_AIM_bytesize, expected_AIT_bytesize;
	309	s64 AIM_byte_addr, AIT_byte_addr, fsckwsp_addr;
	310	s64 byte_addr_diff0, byte_addr_diff1;
	311	s32 bsize;
	312
	313	if ((rc = readSuper(sb, &bh)))
	314	return rc;
	315	j_sb = (struct jfs_superblock *)bh->b_data;
	316
	317	/*
	318	* validate superblock
	319	*/
	320	/* validate fs signature */
	321	if (strncmp(j_sb->s_magic, JFS_MAGIC, 4) \|\|
	322	le32_to_cpu(j_sb->s_version) > JFS_VERSION) {
	323	rc = -EINVAL;
	324	goto out;
	325	}
	326
	327	bsize = le32_to_cpu(j_sb->s_bsize);
	328	#ifdef _JFS_4K
	329	if (bsize != PSIZE) {
	330	jfs_err("Currently only 4K block size supported!");
	331	rc = -EINVAL;
	332	goto out;
	333	}
	334	#endif /* _JFS_4K */
	335
	336	jfs_info("superblock: flag:0x%08x state:0x%08x size:0x%Lx",
	337	le32_to_cpu(j_sb->s_flag), le32_to_cpu(j_sb->s_state),
	338	(unsigned long long) le64_to_cpu(j_sb->s_size));
	339
	340	/* validate the descriptors for Secondary AIM and AIT */
	341	if ((j_sb->s_flag & cpu_to_le32(JFS_BAD_SAIT)) !=
	342	cpu_to_le32(JFS_BAD_SAIT)) {
	343	expected_AIM_bytesize = 2 * PSIZE;
	344	AIM_bytesize = lengthPXD(&(j_sb->s_aim2)) * bsize;
	345	expected_AIT_bytesize = 4 * PSIZE;
	346	AIT_bytesize = lengthPXD(&(j_sb->s_ait2)) * bsize;
	347	AIM_byte_addr = addressPXD(&(j_sb->s_aim2)) * bsize;
	348	AIT_byte_addr = addressPXD(&(j_sb->s_ait2)) * bsize;
	349	byte_addr_diff0 = AIT_byte_addr - AIM_byte_addr;
	350	fsckwsp_addr = addressPXD(&(j_sb->s_fsckpxd)) * bsize;
	351	byte_addr_diff1 = fsckwsp_addr - AIT_byte_addr;
	352	if ((AIM_bytesize != expected_AIM_bytesize) \|\|
	353	(AIT_bytesize != expected_AIT_bytesize) \|\|
	354	(byte_addr_diff0 != AIM_bytesize) \|\|
	355	(byte_addr_diff1 <= AIT_bytesize))
	356	j_sb->s_flag \|= cpu_to_le32(JFS_BAD_SAIT);
	357	}
	358
359	if ((j_sb->s_flag & cpu_to_le32(JFS_GROUPCOMMIT)) !=
360	cpu_to_le32(JFS_GROUPCOMMIT))
361	j_sb->s_flag \|= cpu_to_le32(JFS_GROUPCOMMIT);
362
363	/* validate fs state */
364	if (j_sb->s_state != cpu_to_le32(FM_CLEAN) &&
bc98a42c	365	!sb_rdonly(sb)) {
1da177e4 LT	366	jfs_err("jfs_mount: Mount Failure: File System Dirty.");
	367	rc = -EINVAL;
	368	goto out;
	369	}
	370
	371	sbi->state = le32_to_cpu(j_sb->s_state);
	372	sbi->mntflag = le32_to_cpu(j_sb->s_flag);
	373
	374	/*
	375	* JFS always does I/O by 4K pages. Don't tell the buffer cache
	376	* that we use anything else (leave s_blocksize alone).
	377	*/
	378	sbi->bsize = bsize;
	379	sbi->l2bsize = le16_to_cpu(j_sb->s_l2bsize);
	380
	381	/*
	382	* For now, ignore s_pbsize, l2bfactor. All I/O going through buffer
	383	* cache.
	384	*/
	385	sbi->nbperpage = PSIZE >> sbi->l2bsize;
	386	sbi->l2nbperpage = L2PSIZE - sbi->l2bsize;
	387	sbi->l2niperblk = sbi->l2bsize - L2DISIZE;
	388	if (sbi->mntflag & JFS_INLINELOG)
	389	sbi->logpxd = j_sb->s_logpxd;
	390	else {
	391	sbi->logdev = new_decode_dev(le32_to_cpu(j_sb->s_logdev));
	392	memcpy(sbi->uuid, j_sb->s_uuid, sizeof(sbi->uuid));
	393	memcpy(sbi->loguuid, j_sb->s_loguuid, sizeof(sbi->uuid));
	394	}
	395	sbi->fsckpxd = j_sb->s_fsckpxd;
	396	sbi->ait2 = j_sb->s_ait2;
	397
	398	out:
	399	brelse(bh);
	400	return rc;
	401	}
	402
	403
	404	/*
	405	* updateSuper()
	406	*
	407	* update synchronously superblock if it is mounted read-write.
	408	*/
	409	int updateSuper(struct super_block *sb, uint state)
	410	{
	411	struct jfs_superblock *j_sb;
	412	struct jfs_sb_info *sbi = JFS_SBI(sb);
	413	struct buffer_head *bh;
	414	int rc;
	415
	416	if (sbi->flag & JFS_NOINTEGRITY) {
	417	if (state == FM_DIRTY) {
	418	sbi->p_state = state;
	419	return 0;
	420	} else if (state == FM_MOUNT) {
	421	sbi->p_state = sbi->state;
	422	state = FM_DIRTY;
	423	} else if (state == FM_CLEAN) {
	424	state = sbi->p_state;
	425	} else
	426	jfs_err("updateSuper: bad state");
	427	} else if (sbi->state == FM_DIRTY)
	428	return 0;
63f83c9f	429
1da177e4 LT	430	if ((rc = readSuper(sb, &bh)))
	431	return rc;
	432
	433	j_sb = (struct jfs_superblock *)bh->b_data;
	434
	435	j_sb->s_state = cpu_to_le32(state);
	436	sbi->state = state;
	437
	438	if (state == FM_MOUNT) {
	439	/* record log's dev_t and mount serial number */
	440	j_sb->s_logdev = cpu_to_le32(new_encode_dev(sbi->log->bdev->bd_dev));
	441	j_sb->s_logserial = cpu_to_le32(sbi->log->serial);
	442	} else if (state == FM_CLEAN) {
	443	/*
	444	* If this volume is shared with OS/2, OS/2 will need to
	445	* recalculate DASD usage, since we don't deal with it.
	446	*/
	447	if (j_sb->s_flag & cpu_to_le32(JFS_DASD_ENABLED))
	448	j_sb->s_flag \|= cpu_to_le32(JFS_DASD_PRIME);
	449	}
	450
	451	mark_buffer_dirty(bh);
	452	sync_dirty_buffer(bh);
	453	brelse(bh);
	454
	455	return 0;
	456	}
	457
	458
	459	/*
	460	* readSuper()
	461	*
	462	* read superblock by raw sector address
	463	*/
	464	int readSuper(struct super_block sb, struct buffer_head *bpp)
	465	{
	466	/* read in primary superblock */
	467	*bpp = sb_bread(sb, SUPER1_OFF >> sb->s_blocksize_bits);
	468	if (*bpp)
	469	return 0;
	470
	471	/* read in secondary/replicated superblock */
	472	*bpp = sb_bread(sb, SUPER2_OFF >> sb->s_blocksize_bits);
	473	if (*bpp)
	474	return 0;
	475
	476	return -EIO;
	477	}
	478
	479
	480	/*
	481	* logMOUNT()
	482	*
	483	* function: write a MOUNT log record for file system.
	484	*
	485	* MOUNT record keeps logredo() from processing log records
	486	* for this file system past this point in log.
	487	* it is harmless if mount fails.
	488	*
63f83c9f	489	* note: MOUNT record is at aggregate level, not at fileset level,
1da177e4	490	* since log records of previous mounts of a fileset
63f83c9f	491	* (e.g., AFTER record of extent allocation) have to be processed
1da177e4 LT	492	* to update block allocation map at aggregate level.
	493	*/
	494	static int logMOUNT(struct super_block *sb)
	495	{
	496	struct jfs_log *log = JFS_SBI(sb)->log;
	497	struct lrd lrd;
	498
	499	lrd.logtid = 0;
	500	lrd.backchain = 0;
	501	lrd.type = cpu_to_le16(LOG_MOUNT);
	502	lrd.length = 0;
	503	lrd.aggregate = cpu_to_le32(new_encode_dev(sb->s_bdev->bd_dev));
	504	lmLog(log, NULL, &lrd, NULL);
	505
	506	return 0;
	507	}