jfs_imap.c 84.4 KB
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/*
 *   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
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 *   the Free Software Foundation; either version 2 of the License, or
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 *   (at your option) any later version.
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 *
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 *   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
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 *   along with this program;  if not, write to the Free Software
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 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/*
 *	jfs_imap.c: inode allocation map manager
 *
 * Serialization:
 *   Each AG has a simple lock which is used to control the serialization of
 *	the AG level lists.  This lock should be taken first whenever an AG
 *	level list will be modified or accessed.
 *
 *   Each IAG is locked by obtaining the buffer for the IAG page.
 *
 *   There is also a inode lock for the inode map inode.  A read lock needs to
 *	be taken whenever an IAG is read from the map or the global level
 *	information is read.  A write lock needs to be taken whenever the global
 *	level information is modified or an atomic operation needs to be used.
 *
 *	If more than one IAG is read at one time, the read lock may not
 *	be given up until all of the IAG's are read.  Otherwise, a deadlock
 *	may occur when trying to obtain the read lock while another thread
 *	holding the read lock is waiting on the IAG already being held.
 *
 *   The control page of the inode map is read into memory by diMount().
 *	Thereafter it should only be modified in memory and then it will be
 *	written out when the filesystem is unmounted by diUnmount().
 */

#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/pagemap.h>
#include <linux/quotaops.h>
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#include <linux/slab.h>
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#include "jfs_incore.h"
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#include "jfs_inode.h"
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#include "jfs_filsys.h"
#include "jfs_dinode.h"
#include "jfs_dmap.h"
#include "jfs_imap.h"
#include "jfs_metapage.h"
#include "jfs_superblock.h"
#include "jfs_debug.h"

/*
 * imap locks
 */
/* iag free list lock */
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#define IAGFREE_LOCK_INIT(imap)		mutex_init(&imap->im_freelock)
#define IAGFREE_LOCK(imap)		mutex_lock(&imap->im_freelock)
#define IAGFREE_UNLOCK(imap)		mutex_unlock(&imap->im_freelock)
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/* per ag iag list locks */
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#define AG_LOCK_INIT(imap,index)	mutex_init(&(imap->im_aglock[index]))
#define AG_LOCK(imap,agno)		mutex_lock(&imap->im_aglock[agno])
#define AG_UNLOCK(imap,agno)		mutex_unlock(&imap->im_aglock[agno])
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/*
 * forward references
 */
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static int diAllocAG(struct inomap *, int, bool, struct inode *);
static int diAllocAny(struct inomap *, int, bool, struct inode *);
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static int diAllocBit(struct inomap *, struct iag *, int);
static int diAllocExt(struct inomap *, int, struct inode *);
static int diAllocIno(struct inomap *, int, struct inode *);
static int diFindFree(u32, int);
static int diNewExt(struct inomap *, struct iag *, int);
static int diNewIAG(struct inomap *, int *, int, struct metapage **);
static void duplicateIXtree(struct super_block *, s64, int, s64 *);

static int diIAGRead(struct inomap * imap, int, struct metapage **);
static int copy_from_dinode(struct dinode *, struct inode *);
static void copy_to_dinode(struct dinode *, struct inode *);

/*
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 * NAME:	diMount()
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 *
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 * FUNCTION:	initialize the incore inode map control structures for
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 *		a fileset or aggregate init time.
 *
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 *		the inode map's control structure (dinomap) is
 *		brought in from disk and placed in virtual memory.
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 *
 * PARAMETERS:
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 *	ipimap	- pointer to inode map inode for the aggregate or fileset.
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 *
 * RETURN VALUES:
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 *	0	- success
 *	-ENOMEM	- insufficient free virtual memory.
 *	-EIO	- i/o error.
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 */
int diMount(struct inode *ipimap)
{
	struct inomap *imap;
	struct metapage *mp;
	int index;
	struct dinomap_disk *dinom_le;

	/*
	 * allocate/initialize the in-memory inode map control structure
	 */
	/* allocate the in-memory inode map control structure. */
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	imap = kmalloc(sizeof(struct inomap), GFP_KERNEL);
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	if (imap == NULL) {
		jfs_err("diMount: kmalloc returned NULL!");
		return -ENOMEM;
	}

	/* read the on-disk inode map control structure. */

	mp = read_metapage(ipimap,
			   IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage,
			   PSIZE, 0);
	if (mp == NULL) {
		kfree(imap);
		return -EIO;
	}

	/* copy the on-disk version to the in-memory version. */
	dinom_le = (struct dinomap_disk *) mp->data;
	imap->im_freeiag = le32_to_cpu(dinom_le->in_freeiag);
	imap->im_nextiag = le32_to_cpu(dinom_le->in_nextiag);
	atomic_set(&imap->im_numinos, le32_to_cpu(dinom_le->in_numinos));
	atomic_set(&imap->im_numfree, le32_to_cpu(dinom_le->in_numfree));
	imap->im_nbperiext = le32_to_cpu(dinom_le->in_nbperiext);
	imap->im_l2nbperiext = le32_to_cpu(dinom_le->in_l2nbperiext);
	for (index = 0; index < MAXAG; index++) {
		imap->im_agctl[index].inofree =
		    le32_to_cpu(dinom_le->in_agctl[index].inofree);
		imap->im_agctl[index].extfree =
		    le32_to_cpu(dinom_le->in_agctl[index].extfree);
		imap->im_agctl[index].numinos =
		    le32_to_cpu(dinom_le->in_agctl[index].numinos);
		imap->im_agctl[index].numfree =
		    le32_to_cpu(dinom_le->in_agctl[index].numfree);
	}

	/* release the buffer. */
	release_metapage(mp);

	/*
	 * allocate/initialize inode allocation map locks
	 */
	/* allocate and init iag free list lock */
	IAGFREE_LOCK_INIT(imap);

	/* allocate and init ag list locks */
	for (index = 0; index < MAXAG; index++) {
		AG_LOCK_INIT(imap, index);
	}

	/* bind the inode map inode and inode map control structure
	 * to each other.
	 */
	imap->im_ipimap = ipimap;
	JFS_IP(ipimap)->i_imap = imap;

	return (0);
}


/*
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 * NAME:	diUnmount()
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 *
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 * FUNCTION:	write to disk the incore inode map control structures for
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 *		a fileset or aggregate at unmount time.
 *
 * PARAMETERS:
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 *	ipimap	- pointer to inode map inode for the aggregate or fileset.
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 *
 * RETURN VALUES:
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 *	0	- success
 *	-ENOMEM	- insufficient free virtual memory.
 *	-EIO	- i/o error.
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 */
int diUnmount(struct inode *ipimap, int mounterror)
{
	struct inomap *imap = JFS_IP(ipimap)->i_imap;

	/*
	 * update the on-disk inode map control structure
	 */

	if (!(mounterror || isReadOnly(ipimap)))
		diSync(ipimap);

	/*
	 * Invalidate the page cache buffers
	 */
	truncate_inode_pages(ipimap->i_mapping, 0);

	/*
	 * free in-memory control structure
	 */
	kfree(imap);

	return (0);
}


/*
 *	diSync()
 */
int diSync(struct inode *ipimap)
{
	struct dinomap_disk *dinom_le;
	struct inomap *imp = JFS_IP(ipimap)->i_imap;
	struct metapage *mp;
	int index;

	/*
	 * write imap global conrol page
	 */
	/* read the on-disk inode map control structure */
	mp = get_metapage(ipimap,
			  IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage,
			  PSIZE, 0);
	if (mp == NULL) {
		jfs_err("diSync: get_metapage failed!");
		return -EIO;
	}

	/* copy the in-memory version to the on-disk version */
	dinom_le = (struct dinomap_disk *) mp->data;
	dinom_le->in_freeiag = cpu_to_le32(imp->im_freeiag);
	dinom_le->in_nextiag = cpu_to_le32(imp->im_nextiag);
	dinom_le->in_numinos = cpu_to_le32(atomic_read(&imp->im_numinos));
	dinom_le->in_numfree = cpu_to_le32(atomic_read(&imp->im_numfree));
	dinom_le->in_nbperiext = cpu_to_le32(imp->im_nbperiext);
	dinom_le->in_l2nbperiext = cpu_to_le32(imp->im_l2nbperiext);
	for (index = 0; index < MAXAG; index++) {
		dinom_le->in_agctl[index].inofree =
		    cpu_to_le32(imp->im_agctl[index].inofree);
		dinom_le->in_agctl[index].extfree =
		    cpu_to_le32(imp->im_agctl[index].extfree);
		dinom_le->in_agctl[index].numinos =
		    cpu_to_le32(imp->im_agctl[index].numinos);
		dinom_le->in_agctl[index].numfree =
		    cpu_to_le32(imp->im_agctl[index].numfree);
	}

	/* write out the control structure */
	write_metapage(mp);

	/*
	 * write out dirty pages of imap
	 */
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	filemap_write_and_wait(ipimap->i_mapping);
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	diWriteSpecial(ipimap, 0);

	return (0);
}


/*
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 * NAME:	diRead()
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 *
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 * FUNCTION:	initialize an incore inode from disk.
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 *
 *		on entry, the specifed incore inode should itself
 *		specify the disk inode number corresponding to the
 *		incore inode (i.e. i_number should be initialized).
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 *
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 *		this routine handles incore inode initialization for
 *		both "special" and "regular" inodes.  special inodes
 *		are those required early in the mount process and
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 *		require special handling since much of the file system
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 *		is not yet initialized.  these "special" inodes are
 *		identified by a NULL inode map inode pointer and are
 *		actually initialized by a call to diReadSpecial().
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 *
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 *		for regular inodes, the iag describing the disk inode
 *		is read from disk to determine the inode extent address
 *		for the disk inode.  with the inode extent address in
 *		hand, the page of the extent that contains the disk
 *		inode is read and the disk inode is copied to the
 *		incore inode.
 *
 * PARAMETERS:
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 *	ip	-  pointer to incore inode to be initialized from disk.
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 *
 * RETURN VALUES:
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 *	0	- success
 *	-EIO	- i/o error.
 *	-ENOMEM	- insufficient memory
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 *
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 */
int diRead(struct inode *ip)
{
	struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
	int iagno, ino, extno, rc;
	struct inode *ipimap;
	struct dinode *dp;
	struct iag *iagp;
	struct metapage *mp;
	s64 blkno, agstart;
	struct inomap *imap;
	int block_offset;
	int inodes_left;
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	unsigned long pageno;
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	int rel_inode;

	jfs_info("diRead: ino = %ld", ip->i_ino);

	ipimap = sbi->ipimap;
	JFS_IP(ip)->ipimap = ipimap;

	/* determine the iag number for this inode (number) */
	iagno = INOTOIAG(ip->i_ino);

	/* read the iag */
	imap = JFS_IP(ipimap)->i_imap;
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	IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
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	rc = diIAGRead(imap, iagno, &mp);
	IREAD_UNLOCK(ipimap);
	if (rc) {
		jfs_err("diRead: diIAGRead returned %d", rc);
		return (rc);
	}

	iagp = (struct iag *) mp->data;

	/* determine inode extent that holds the disk inode */
	ino = ip->i_ino & (INOSPERIAG - 1);
	extno = ino >> L2INOSPEREXT;

	if ((lengthPXD(&iagp->inoext[extno]) != imap->im_nbperiext) ||
	    (addressPXD(&iagp->inoext[extno]) == 0)) {
		release_metapage(mp);
		return -ESTALE;
	}

	/* get disk block number of the page within the inode extent
	 * that holds the disk inode.
	 */
	blkno = INOPBLK(&iagp->inoext[extno], ino, sbi->l2nbperpage);

	/* get the ag for the iag */
	agstart = le64_to_cpu(iagp->agstart);

	release_metapage(mp);

	rel_inode = (ino & (INOSPERPAGE - 1));
	pageno = blkno >> sbi->l2nbperpage;

	if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) {
		/*
		 * OS/2 didn't always align inode extents on page boundaries
		 */
		inodes_left =
		     (sbi->nbperpage - block_offset) << sbi->l2niperblk;

		if (rel_inode < inodes_left)
			rel_inode += block_offset << sbi->l2niperblk;
		else {
			pageno += 1;
			rel_inode -= inodes_left;
		}
	}

	/* read the page of disk inode */
	mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1);
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	if (!mp) {
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		jfs_err("diRead: read_metapage failed");
		return -EIO;
	}

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	/* locate the disk inode requested */
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	dp = (struct dinode *) mp->data;
	dp += rel_inode;

	if (ip->i_ino != le32_to_cpu(dp->di_number)) {
		jfs_error(ip->i_sb, "diRead: i_ino != di_number");
		rc = -EIO;
	} else if (le32_to_cpu(dp->di_nlink) == 0)
		rc = -ESTALE;
	else
		/* copy the disk inode to the in-memory inode */
		rc = copy_from_dinode(dp, ip);

	release_metapage(mp);

	/* set the ag for the inode */
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	JFS_IP(ip)->agstart = agstart;
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	JFS_IP(ip)->active_ag = -1;

	return (rc);
}


/*
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 * NAME:	diReadSpecial()
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 *
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 * FUNCTION:	initialize a 'special' inode from disk.
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 *
 *		this routines handles aggregate level inodes.  The
 *		inode cache cannot differentiate between the
 *		aggregate inodes and the filesystem inodes, so we
 *		handle these here.  We don't actually use the aggregate
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 *		inode map, since these inodes are at a fixed location
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 *		and in some cases the aggregate inode map isn't initialized
 *		yet.
 *
 * PARAMETERS:
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 *	sb - filesystem superblock
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 *	inum - aggregate inode number
 *	secondary - 1 if secondary aggregate inode table
 *
 * RETURN VALUES:
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 *	new inode	- success
 *	NULL		- i/o error.
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 */
struct inode *diReadSpecial(struct super_block *sb, ino_t inum, int secondary)
{
	struct jfs_sb_info *sbi = JFS_SBI(sb);
	uint address;
	struct dinode *dp;
	struct inode *ip;
	struct metapage *mp;

	ip = new_inode(sb);
	if (ip == NULL) {
		jfs_err("diReadSpecial: new_inode returned NULL!");
		return ip;
	}

	if (secondary) {
		address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage;
		JFS_IP(ip)->ipimap = sbi->ipaimap2;
	} else {
		address = AITBL_OFF >> L2PSIZE;
		JFS_IP(ip)->ipimap = sbi->ipaimap;
	}

	ASSERT(inum < INOSPEREXT);

	ip->i_ino = inum;

	address += inum >> 3;	/* 8 inodes per 4K page */

	/* read the page of fixed disk inode (AIT) in raw mode */
	mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1);
	if (mp == NULL) {
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		set_nlink(ip, 1);	/* Don't want iput() deleting it */
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		iput(ip);
		return (NULL);
	}

	/* get the pointer to the disk inode of interest */
	dp = (struct dinode *) (mp->data);
	dp += inum % 8;		/* 8 inodes per 4K page */

	/* copy on-disk inode to in-memory inode */
	if ((copy_from_dinode(dp, ip)) != 0) {
		/* handle bad return by returning NULL for ip */
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		set_nlink(ip, 1);	/* Don't want iput() deleting it */
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		iput(ip);
		/* release the page */
		release_metapage(mp);
		return (NULL);

	}

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	ip->i_mapping->a_ops = &jfs_metapage_aops;
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	mapping_set_gfp_mask(ip->i_mapping, GFP_NOFS);

	/* Allocations to metadata inodes should not affect quotas */
	ip->i_flags |= S_NOQUOTA;

	if ((inum == FILESYSTEM_I) && (JFS_IP(ip)->ipimap == sbi->ipaimap)) {
		sbi->gengen = le32_to_cpu(dp->di_gengen);
		sbi->inostamp = le32_to_cpu(dp->di_inostamp);
	}

	/* release the page */
	release_metapage(mp);

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	/*
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	 * __mark_inode_dirty expects inodes to be hashed.  Since we don't
	 * want special inodes in the fileset inode space, we make them
	 * appear hashed, but do not put on any lists.  hlist_del()
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	 * will work fine and require no locking.
	 */
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	hlist_add_fake(&ip->i_hash);
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	return (ip);
}

/*
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 * NAME:	diWriteSpecial()
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 *
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 * FUNCTION:	Write the special inode to disk
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 *
 * PARAMETERS:
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 *	ip - special inode
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 *	secondary - 1 if secondary aggregate inode table
 *
 * RETURN VALUES: none
 */

void diWriteSpecial(struct inode *ip, int secondary)
{
	struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
	uint address;
	struct dinode *dp;
	ino_t inum = ip->i_ino;
	struct metapage *mp;

	if (secondary)
		address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage;
	else
		address = AITBL_OFF >> L2PSIZE;

	ASSERT(inum < INOSPEREXT);

	address += inum >> 3;	/* 8 inodes per 4K page */

	/* read the page of fixed disk inode (AIT) in raw mode */
	mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1);
	if (mp == NULL) {
		jfs_err("diWriteSpecial: failed to read aggregate inode "
			"extent!");
		return;
	}

	/* get the pointer to the disk inode of interest */
	dp = (struct dinode *) (mp->data);
	dp += inum % 8;		/* 8 inodes per 4K page */

	/* copy on-disk inode to in-memory inode */
	copy_to_dinode(dp, ip);
	memcpy(&dp->di_xtroot, &JFS_IP(ip)->i_xtroot, 288);

	if (inum == FILESYSTEM_I)
		dp->di_gengen = cpu_to_le32(sbi->gengen);

	/* write the page */
	write_metapage(mp);
}

/*
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 * NAME:	diFreeSpecial()
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 *
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 * FUNCTION:	Free allocated space for special inode
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 */
void diFreeSpecial(struct inode *ip)
{
	if (ip == NULL) {
		jfs_err("diFreeSpecial called with NULL ip!");
		return;
	}
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	filemap_write_and_wait(ip->i_mapping);
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	truncate_inode_pages(ip->i_mapping, 0);
	iput(ip);
}



/*
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 * NAME:	diWrite()
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 *
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 * FUNCTION:	write the on-disk inode portion of the in-memory inode
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 *		to its corresponding on-disk inode.
 *
 *		on entry, the specifed incore inode should itself
 *		specify the disk inode number corresponding to the
 *		incore inode (i.e. i_number should be initialized).
 *
 *		the inode contains the inode extent address for the disk
 *		inode.  with the inode extent address in hand, the
 *		page of the extent that contains the disk inode is
 *		read and the disk inode portion of the incore inode
 *		is copied to the disk inode.
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 *
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 * PARAMETERS:
 *	tid -  transacation id
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 *
 * RETURN VALUES:
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 *	0	- success
 *	-EIO	- i/o error.
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 */
int diWrite(tid_t tid, struct inode *ip)
{
	struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
	struct jfs_inode_info *jfs_ip = JFS_IP(ip);
	int rc = 0;
	s32 ino;
	struct dinode *dp;
	s64 blkno;
	int block_offset;
	int inodes_left;
	struct metapage *mp;
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	unsigned long pageno;
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	int rel_inode;
	int dioffset;
	struct inode *ipimap;
	uint type;
	lid_t lid;
	struct tlock *ditlck, *tlck;
	struct linelock *dilinelock, *ilinelock;
	struct lv *lv;
	int n;

	ipimap = jfs_ip->ipimap;

	ino = ip->i_ino & (INOSPERIAG - 1);

	if (!addressPXD(&(jfs_ip->ixpxd)) ||
	    (lengthPXD(&(jfs_ip->ixpxd)) !=
	     JFS_IP(ipimap)->i_imap->im_nbperiext)) {
		jfs_error(ip->i_sb, "diWrite: ixpxd invalid");
		return -EIO;
	}

	/*
	 * read the page of disk inode containing the specified inode:
	 */
	/* compute the block address of the page */
	blkno = INOPBLK(&(jfs_ip->ixpxd), ino, sbi->l2nbperpage);

	rel_inode = (ino & (INOSPERPAGE - 1));
	pageno = blkno >> sbi->l2nbperpage;

	if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) {
		/*
		 * OS/2 didn't always align inode extents on page boundaries
		 */
		inodes_left =
		    (sbi->nbperpage - block_offset) << sbi->l2niperblk;

		if (rel_inode < inodes_left)
			rel_inode += block_offset << sbi->l2niperblk;
		else {
			pageno += 1;
			rel_inode -= inodes_left;
		}
	}
	/* read the page of disk inode */
      retry:
	mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1);
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	if (!mp)
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		return -EIO;

	/* get the pointer to the disk inode */
	dp = (struct dinode *) mp->data;
	dp += rel_inode;

	dioffset = (ino & (INOSPERPAGE - 1)) << L2DISIZE;

	/*
	 * acquire transaction lock on the on-disk inode;
	 * N.B. tlock is acquired on ipimap not ip;
	 */
	if ((ditlck =
	     txLock(tid, ipimap, mp, tlckINODE | tlckENTRY)) == NULL)
		goto retry;
	dilinelock = (struct linelock *) & ditlck->lock;

	/*
	 * copy btree root from in-memory inode to on-disk inode
	 *
	 * (tlock is taken from inline B+-tree root in in-memory
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	 * inode when the B+-tree root is updated, which is pointed
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	 * by jfs_ip->blid as well as being on tx tlock list)
	 *
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	 * further processing of btree root is based on the copy
	 * in in-memory inode, where txLog() will log from, and,
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	 * for xtree root, txUpdateMap() will update map and reset
	 * XAD_NEW bit;
	 */

	if (S_ISDIR(ip->i_mode) && (lid = jfs_ip->xtlid)) {
		/*
		 * This is the special xtree inside the directory for storing
		 * the directory table
		 */
		xtpage_t *p, *xp;
		xad_t *xad;

		jfs_ip->xtlid = 0;
		tlck = lid_to_tlock(lid);
		assert(tlck->type & tlckXTREE);
		tlck->type |= tlckBTROOT;
		tlck->mp = mp;
		ilinelock = (struct linelock *) & tlck->lock;

		/*
		 * copy xtree root from inode to dinode:
		 */
		p = &jfs_ip->i_xtroot;
		xp = (xtpage_t *) &dp->di_dirtable;
		lv = ilinelock->lv;
		for (n = 0; n < ilinelock->index; n++, lv++) {
			memcpy(&xp->xad[lv->offset], &p->xad[lv->offset],
			       lv->length << L2XTSLOTSIZE);
		}

		/* reset on-disk (metadata page) xtree XAD_NEW bit */
		xad = &xp->xad[XTENTRYSTART];
		for (n = XTENTRYSTART;
		     n < le16_to_cpu(xp->header.nextindex); n++, xad++)
			if (xad->flag & (XAD_NEW | XAD_EXTENDED))
				xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
	}

	if ((lid = jfs_ip->blid) == 0)
		goto inlineData;
	jfs_ip->blid = 0;

	tlck = lid_to_tlock(lid);
	type = tlck->type;
	tlck->type |= tlckBTROOT;
	tlck->mp = mp;
	ilinelock = (struct linelock *) & tlck->lock;

	/*
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	 *	regular file: 16 byte (XAD slot) granularity
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	 */
	if (type & tlckXTREE) {
		xtpage_t *p, *xp;
		xad_t *xad;

		/*
		 * copy xtree root from inode to dinode:
		 */
		p = &jfs_ip->i_xtroot;
		xp = &dp->di_xtroot;
		lv = ilinelock->lv;
		for (n = 0; n < ilinelock->index; n++, lv++) {
			memcpy(&xp->xad[lv->offset], &p->xad[lv->offset],
			       lv->length << L2XTSLOTSIZE);
		}

		/* reset on-disk (metadata page) xtree XAD_NEW bit */
		xad = &xp->xad[XTENTRYSTART];
		for (n = XTENTRYSTART;
		     n < le16_to_cpu(xp->header.nextindex); n++, xad++)
			if (xad->flag & (XAD_NEW | XAD_EXTENDED))
				xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
	}
	/*
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	 *	directory: 32 byte (directory entry slot) granularity
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	 */
	else if (type & tlckDTREE) {
		dtpage_t *p, *xp;

		/*
		 * copy dtree root from inode to dinode:
		 */
		p = (dtpage_t *) &jfs_ip->i_dtroot;
		xp = (dtpage_t *) & dp->di_dtroot;
		lv = ilinelock->lv;
		for (n = 0; n < ilinelock->index; n++, lv++) {
			memcpy(&xp->slot[lv->offset], &p->slot[lv->offset],
			       lv->length << L2DTSLOTSIZE);
		}
	} else {
		jfs_err("diWrite: UFO tlock");
	}

      inlineData:
	/*
	 * copy inline symlink from in-memory inode to on-disk inode
	 */
	if (S_ISLNK(ip->i_mode) && ip->i_size < IDATASIZE) {
		lv = & dilinelock->lv[dilinelock->index];
		lv->offset = (dioffset + 2 * 128) >> L2INODESLOTSIZE;
		lv->length = 2;
		memcpy(&dp->di_fastsymlink, jfs_ip->i_inline, IDATASIZE);
		dilinelock->index++;
	}
	/*
	 * copy inline data from in-memory inode to on-disk inode:
	 * 128 byte slot granularity
	 */
	if (test_cflag(COMMIT_Inlineea, ip)) {
		lv = & dilinelock->lv[dilinelock->index];
		lv->offset = (dioffset + 3 * 128) >> L2INODESLOTSIZE;
		lv->length = 1;
		memcpy(&dp->di_inlineea, jfs_ip->i_inline_ea, INODESLOTSIZE);
		dilinelock->index++;

		clear_cflag(COMMIT_Inlineea, ip);
	}

	/*
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	 */
	lv = & dilinelock->lv[dilinelock->index];
	lv->offset = dioffset >> L2INODESLOTSIZE;
	copy_to_dinode(dp, ip);
	if (test_and_clear_cflag(COMMIT_Dirtable, ip)) {
		lv->length = 2;
		memcpy(&dp->di_dirtable, &jfs_ip->i_dirtable, 96);
	} else
		lv->length = 1;
	dilinelock->index++;

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	/* release the buffer holding the updated on-disk inode.
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	 * the buffer will be later written by commit processing.
	 */
	write_metapage(mp);

	return (rc);
}


/*
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 * NAME:	diFree(ip)
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 *
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 * FUNCTION:	free a specified inode from the inode working map
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 *		for a fileset or aggregate.
 *
 *		if the inode to be freed represents the first (only)
 *		free inode within the iag, the iag will be placed on
 *		the ag free inode list.
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 *
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 *		freeing the inode will cause the inode extent to be
 *		freed if the inode is the only allocated inode within
 *		the extent.  in this case all the disk resource backing
 *		up the inode extent will be freed. in addition, the iag
 *		will be placed on the ag extent free list if the extent
 *		is the first free extent in the iag.  if freeing the
 *		extent also means that no free inodes will exist for
 *		the iag, the iag will also be removed from the ag free
 *		inode list.
 *
 *		the iag describing the inode will be freed if the extent
 *		is to be freed and it is the only backed extent within
 *		the iag.  in this case, the iag will be removed from the
 *		ag free extent list and ag free inode list and placed on
 *		the inode map's free iag list.
 *
 *		a careful update approach is used to provide consistency
 *		in the face of updates to multiple buffers.  under this
 *		approach, all required buffers are obtained before making
 *		any updates and are held until all updates are complete.
 *
 * PARAMETERS:
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 *	ip	- inode to be freed.
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 *
 * RETURN VALUES:
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 *	0	- success
 *	-EIO	- i/o error.
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 */
int diFree(struct inode *ip)
{
	int rc;
	ino_t inum = ip->i_ino;
	struct iag *iagp, *aiagp, *biagp, *ciagp, *diagp;
	struct metapage *mp, *amp, *bmp, *cmp, *dmp;
	int iagno, ino, extno, bitno, sword, agno;
	int back, fwd;
	u32 bitmap, mask;
	struct inode *ipimap = JFS_SBI(ip->i_sb)->ipimap;
	struct inomap *imap = JFS_IP(ipimap)->i_imap;
	pxd_t freepxd;
	tid_t tid;
	struct inode *iplist[3];
	struct tlock *tlck;
	struct pxd_lock *pxdlock;

	/*
	 * This is just to suppress compiler warnings.  The same logic that
	 * references these variables is used to initialize them.
	 */
	aiagp = biagp = ciagp = diagp = NULL;

	/* get the iag number containing the inode.
	 */
	iagno = INOTOIAG(inum);

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	/* make sure that the iag is contained within
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	 * the map.
	 */
	if (iagno >= imap->im_nextiag) {
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		print_hex_dump(KERN_ERR, "imap: ", DUMP_PREFIX_ADDRESS, 16, 4,
			       imap, 32, 0);
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		jfs_error(ip->i_sb,
			  "diFree: inum = %d, iagno = %d, nextiag = %d",
			  (uint) inum, iagno, imap->im_nextiag);
		return -EIO;
	}

	/* get the allocation group for this ino.
	 */
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	agno = BLKTOAG(JFS_IP(ip)->agstart, JFS_SBI(ip->i_sb));
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	/* Lock the AG specific inode map information
	 */
	AG_LOCK(imap, agno);

	/* Obtain read lock in imap inode.  Don't release it until we have
	 * read all of the IAG's that we are going to.
	 */
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	IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
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	/* read the iag.
	 */
	if ((rc = diIAGRead(imap, iagno, &mp))) {
		IREAD_UNLOCK(ipimap);
		AG_UNLOCK(imap, agno);
		return (rc);
	}
	iagp = (struct iag *) mp->data;

	/* get the inode number and extent number of the inode within
	 * the iag and the inode number within the extent.
	 */
	ino = inum & (INOSPERIAG - 1);
	extno = ino >> L2INOSPEREXT;
	bitno = ino & (INOSPEREXT - 1);
	mask = HIGHORDER >> bitno;

	if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
		jfs_error(ip->i_sb,
			  "diFree: wmap shows inode already free");
	}

	if (!addressPXD(&iagp->inoext[extno])) {
		release_metapage(mp);
		IREAD_UNLOCK(ipimap);
		AG_UNLOCK(imap, agno);
		jfs_error(ip->i_sb, "diFree: invalid inoext");
		return -EIO;
	}

	/* compute the bitmap for the extent reflecting the freed inode.
	 */
	bitmap = le32_to_cpu(iagp->wmap[extno]) & ~mask;

	if (imap->im_agctl[agno].numfree > imap->im_agctl[agno].numinos) {
		release_metapage(mp);
		IREAD_UNLOCK(ipimap);
		AG_UNLOCK(imap, agno);
		jfs_error(ip->i_sb, "diFree: numfree > numinos");
		return -EIO;
	}
	/*
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	 *	inode extent still has some inodes or below low water mark:
	 *	keep the inode extent;
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	 */
	if (bitmap ||
	    imap->im_agctl[agno].numfree < 96 ||
	    (imap->im_agctl[agno].numfree < 288 &&
	     (((imap->im_agctl[agno].numfree * 100) /
	       imap->im_agctl[agno].numinos) <= 25))) {
		/* if the iag currently has no free inodes (i.e.,
		 * the inode being freed is the first free inode of iag),
		 * insert the iag at head of the inode free list for the ag.
		 */
		if (iagp->nfreeinos == 0) {
			/* check if there are any iags on the ag inode
			 * free list.  if so, read the first one so that
			 * we can link the current iag onto the list at
			 * the head.
			 */
			if ((fwd = imap->im_agctl[agno].inofree) >= 0) {
				/* read the iag that currently is the head
				 * of the list.
				 */
				if ((rc = diIAGRead(imap, fwd, &amp))) {
					IREAD_UNLOCK(ipimap);
					AG_UNLOCK(imap, agno);
					release_metapage(mp);
					return (rc);
				}
				aiagp = (struct iag *) amp->data;

				/* make current head point back to the iag.
				 */
				aiagp->inofreeback = cpu_to_le32(iagno);

				write_metapage(amp);
			}

			/* iag points forward to current head and iag
			 * becomes the new head of the list.
			 */
			iagp->inofreefwd =
			    cpu_to_le32(imap->im_agctl[agno].inofree);
			iagp->inofreeback = cpu_to_le32(-1);
			imap->im_agctl[agno].inofree = iagno;
		}
		IREAD_UNLOCK(ipimap);

		/* update the free inode summary map for the extent if
		 * freeing the inode means the extent will now have free
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		 * inodes (i.e., the inode being freed is the first free
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		 * inode of extent),
		 */
		if (iagp->wmap[extno] == cpu_to_le32(ONES)) {
			sword = extno >> L2EXTSPERSUM;
			bitno = extno & (EXTSPERSUM - 1);
			iagp->inosmap[sword] &=
			    cpu_to_le32(~(HIGHORDER >> bitno));
		}

		/* update the bitmap.
		 */
		iagp->wmap[extno] = cpu_to_le32(bitmap);

		/* update the free inode counts at the iag, ag and
		 * map level.
		 */
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		le32_add_cpu(&iagp->nfreeinos, 1);
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		imap->im_agctl[agno].numfree += 1;
		atomic_inc(&imap->im_numfree);

		/* release the AG inode map lock
		 */
		AG_UNLOCK(imap, agno);

		/* write the iag */
		write_metapage(mp);

		return (0);
	}


	/*
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	 *	free the inode extent;
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	 */

	/*
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	 */
	amp = bmp = cmp = dmp = NULL;
	fwd = back = -1;

	/* check if the iag currently has no free extents.  if so,
	 * it will be placed on the head of the ag extent free list.
	 */
	if (iagp->nfreeexts == 0) {
		/* check if the ag extent free list has any iags.
		 * if so, read the iag at the head of the list now.
		 * this (head) iag will be updated later to reflect
		 * the addition of the current iag at the head of
		 * the list.
		 */
		if ((fwd = imap->im_agctl[agno].extfree) >= 0) {
			if ((rc = diIAGRead(imap, fwd, &amp)))
				goto error_out;
			aiagp = (struct iag *) amp->data;
		}
	} else {
		/* iag has free extents. check if the addition of a free
		 * extent will cause all extents to be free within this
		 * iag.  if so, the iag will be removed from the ag extent
		 * free list and placed on the inode map's free iag list.
		 */
		if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) {
			/* in preparation for removing the iag from the
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			 * ag extent free list, read the iags preceding
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			 * and following the iag on the ag extent free
			 * list.
			 */
			if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) {
				if ((rc = diIAGRead(imap, fwd, &amp)))
					goto error_out;
				aiagp = (struct iag *) amp->data;
			}

			if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) {
				if ((rc = diIAGRead(imap, back, &bmp)))
					goto error_out;
				biagp = (struct iag *) bmp->data;
			}
		}
	}

	/* remove the iag from the ag inode free list if freeing
	 * this extent cause the iag to have no free inodes.
	 */
	if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) {
		int inofreeback = le32_to_cpu(iagp->inofreeback);
		int inofreefwd = le32_to_cpu(iagp->inofreefwd);

		/* in preparation for removing the iag from the
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		 * ag inode free list, read the iags preceding
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		 * and following the iag on the ag inode free
		 * list.  before reading these iags, we must make
		 * sure that we already don't have them in hand
		 * from up above, since re-reading an iag (buffer)
		 * we are currently holding would cause a deadlock.
		 */
		if (inofreefwd >= 0) {

			if (inofreefwd == fwd)
				ciagp = (struct iag *) amp->data;
			else if (inofreefwd == back)
				ciagp = (struct iag *) bmp->data;
			else {
				if ((rc =
				     diIAGRead(imap, inofreefwd, &cmp)))
					goto error_out;
				ciagp = (struct iag *) cmp->data;
			}
			assert(ciagp != NULL);
		}

		if (inofreeback >= 0) {
			if (inofreeback == fwd)
				diagp = (struct iag *) amp->data;
			else if (inofreeback == back)
				diagp = (struct iag *) bmp->data;
			else {
				if ((rc =
				     diIAGRead(imap, inofreeback, &dmp)))
					goto error_out;
				diagp = (struct iag *) dmp->data;
			}
			assert(diagp != NULL);
		}
	}

	IREAD_UNLOCK(ipimap);

	/*
	 * invalidate any page of the inode extent freed from buffer cache;
	 */
	freepxd = iagp->inoext[extno];
	invalidate_pxd_metapages(ip, freepxd);

	/*
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	 */
	/* add the iag to the ag extent free list if this is the
	 * first free extent for the iag.
	 */
	if (iagp->nfreeexts == 0) {
		if (fwd >= 0)
			aiagp->extfreeback = cpu_to_le32(iagno);

		iagp->extfreefwd =
		    cpu_to_le32(imap->im_agctl[agno].extfree);
		iagp->extfreeback = cpu_to_le32(-1);
		imap->im_agctl[agno].extfree = iagno;
	} else {
		/* remove the iag from the ag extent list if all extents
		 * are now free and place it on the inode map iag free list.
		 */
		if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) {
			if (fwd >= 0)
				aiagp->extfreeback = iagp->extfreeback;

			if (back >= 0)
				biagp->extfreefwd = iagp->extfreefwd;
			else
				imap->im_agctl[agno].extfree =
				    le32_to_cpu(iagp->extfreefwd);

			iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);

			IAGFREE_LOCK(imap);
			iagp->iagfree = cpu_to_le32(imap->im_freeiag);
			imap->im_freeiag = iagno;
			IAGFREE_UNLOCK(imap);
		}
	}

	/* remove the iag from the ag inode free list if freeing
	 * this extent causes the iag to have no free inodes.
	 */
	if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) {
		if ((int) le32_to_cpu(iagp->inofreefwd) >= 0)
			ciagp->inofreeback = iagp->inofreeback;

		if ((int) le32_to_cpu(iagp->inofreeback) >= 0)
			diagp->inofreefwd = iagp->inofreefwd;
		else
			imap->im_agctl[agno].inofree =
			    le32_to_cpu(iagp->inofreefwd);

		iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
	}

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	/* update the inode extent address and working map
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	 * to reflect the free extent.
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	 * the permanent map should have been updated already
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	 * for the inode being freed.
	 */
	if (iagp->pmap[extno] != 0) {
		jfs_error(ip->i_sb, "diFree: the pmap does not show inode free");
	}
	iagp->wmap[extno] = 0;
	PXDlength(&iagp->inoext[extno], 0);
	PXDaddress(&iagp->inoext[extno], 0);

	/* update the free extent and free inode summary maps
	 * to reflect the freed extent.
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	 * the inode summary map is marked to indicate no inodes
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	 * available for the freed extent.
	 */
	sword = extno >> L2EXTSPERSUM;
	bitno = extno & (EXTSPERSUM - 1);
	mask = HIGHORDER >> bitno;
	iagp->inosmap[sword] |= cpu_to_le32(mask);
	iagp->extsmap[sword] &= cpu_to_le32(~mask);

	/* update the number of free inodes and number of free extents
	 * for the iag.
	 */
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	le32_add_cpu(&iagp->nfreeinos, -(INOSPEREXT - 1));
	le32_add_cpu(&iagp->nfreeexts, 1);
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	/* update the number of free inodes and backed inodes
	 * at the ag and inode map level.
	 */
	imap->im_agctl[agno].numfree -= (INOSPEREXT - 1);
	imap->im_agctl[agno].numinos -= INOSPEREXT;
	atomic_sub(INOSPEREXT - 1, &imap->im_numfree);
	atomic_sub(INOSPEREXT, &imap->im_numinos);

	if (amp)
		write_metapage(amp);
	if (bmp)
		write_metapage(bmp);
	if (cmp)
		write_metapage(cmp);
	if (dmp)
		write_metapage(dmp);

	/*
	 * start transaction to update block allocation map
	 * for the inode extent freed;
	 *
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	 * N.B. AG_LOCK is released and iag will be released below, and
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	 * other thread may allocate inode from/reusing the ixad freed
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	 * BUT with new/different backing inode extent from the extent
	 * to be freed by the transaction;
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	 */
	tid = txBegin(ipimap->i_sb, COMMIT_FORCE);
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	mutex_lock(&JFS_IP(ipimap)->commit_mutex);
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	/* acquire tlock of the iag page of the freed ixad
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	 * to force the page NOHOMEOK (even though no data is
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	 * logged from the iag page) until NOREDOPAGE|FREEXTENT log
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	 * for the free of the extent is committed;
	 * write FREEXTENT|NOREDOPAGE log record
	 * N.B. linelock is overlaid as freed extent descriptor;
	 */
	tlck = txLock(tid, ipimap, mp, tlckINODE | tlckFREE);
	pxdlock = (struct pxd_lock *) & tlck->lock;
	pxdlock->flag = mlckFREEPXD;
	pxdlock->pxd = freepxd;
	pxdlock->index = 1;

	write_metapage(mp);

	iplist[0] = ipimap;

	/*
	 * logredo needs the IAG number and IAG extent index in order
	 * to ensure that the IMap is consistent.  The least disruptive
	 * way to pass these values through  to the transaction manager
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	 * is in the iplist array.
	 *
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	 * It's not pretty, but it works.
	 */
	iplist[1] = (struct inode *) (size_t)iagno;
	iplist[2] = (struct inode *) (size_t)extno;

	rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);

	txEnd(tid);
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	mutex_unlock(&JFS_IP(ipimap)->commit_mutex);
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	/* unlock the AG inode map information */
	AG_UNLOCK(imap, agno);

	return (0);

      error_out:
	IREAD_UNLOCK(ipimap);

	if (amp)
		release_metapage(amp);
	if (bmp)
		release_metapage(bmp);
	if (cmp)
		release_metapage(cmp);
	if (dmp)
		release_metapage(dmp);

	AG_UNLOCK(imap, agno);

	release_metapage(mp);

	return (rc);
}

/*
 * There are several places in the diAlloc* routines where we initialize
 * the inode.
 */
static inline void
diInitInode(struct inode *ip, int iagno, int ino, int extno, struct iag * iagp)
{
	struct jfs_inode_info *jfs_ip = JFS_IP(ip);

	ip->i_ino = (iagno << L2INOSPERIAG) + ino;
	jfs_ip->ixpxd = iagp->inoext[extno];
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	jfs_ip->agstart = le64_to_cpu(iagp->agstart);
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	jfs_ip->active_ag = -1;
}


/*
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 *
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 *		for a fileset or aggregate.
 *
 * PARAMETERS:
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 *	dir	- 'true' if the new disk inode is for a directory.
 *	ip	- pointer to a new inode
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 *
 * RETURN VALUES:
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 *	0	- success.
 *	-ENOSPC	- insufficient disk resources.
 *	-EIO	- i/o error.
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 */
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int diAlloc(struct inode *pip, bool dir, struct inode *ip)
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{
	int rc, ino, iagno, addext, extno, bitno, sword;
	int nwords, rem, i, agno;
	u32 mask, inosmap, extsmap;
	struct inode *ipimap;
	struct metapage *mp;
	ino_t inum;
	struct iag *iagp;
	struct inomap *imap;

	/* get the pointers to the inode map inode and the
	 * corresponding imap control structure.
	 */
	ipimap = JFS_SBI(pip->i_sb)->ipimap;
	imap = JFS_IP(ipimap)->i_imap;
	JFS_IP(ip)->ipimap = ipimap;
	JFS_IP(ip)->fileset = FILESYSTEM_I;

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	/* for a directory, the allocation policy is to start
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	 * at the ag level using the preferred ag.
	 */
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	if (dir) {
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		agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap);
		AG_LOCK(imap, agno);
		goto tryag;
	}

	/* for files, the policy starts off by trying to allocate from
	 * the same iag containing the parent disk inode:
	 * try to allocate the new disk inode close to the parent disk
	 * inode, using parent disk inode number + 1 as the allocation
	 * hint.  (we use a left-to-right policy to attempt to avoid
	 * moving backward on the disk.)  compute the hint within the
	 * file system and the iag.
	 */

	/* get the ag number of this iag */
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	agno = BLKTOAG(JFS_IP(pip)->agstart, JFS_SBI(pip->i_sb));
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	if (atomic_read(&JFS_SBI(pip->i_sb)->bmap->db_active[agno])) {
		/*
		 * There is an open file actively growing.  We want to
		 * allocate new inodes from a different ag to avoid
		 * fragmentation problems.
		 */
		agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap);
		AG_LOCK(imap, agno);
		goto tryag;
	}

	inum = pip->i_ino + 1;
	ino = inum & (INOSPERIAG - 1);

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	if (ino == 0)
		inum = pip->i_ino;

	/* lock the AG inode map information */
	AG_LOCK(imap, agno);

	/* Get read lock on imap inode */
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	IREAD_LOCK(ipimap, RDWRLOCK_IMAP);
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	/* get the iag number and read the iag */
	iagno = INOTOIAG(inum);
	if ((rc = diIAGRead(imap, iagno, &mp))) {
		IREAD_UNLOCK(ipimap);
		AG_UNLOCK(imap, agno);
		return (rc);
	}
	iagp = (struct iag *) mp->data;

	/* determine if new inode extent is allowed to be added to the iag.
	 * new inode extent can be added to the iag if the ag
	 * has less than 32 free disk inodes and the iag has free extents.
	 */
	addext = (imap->im_agctl[agno].numfree < 32 && iagp->nfreeexts);

	/*
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	 */
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	/* check if the inode may be allocated from the iag
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	 * (i.e. the inode has free inodes or new extent can be added).
	 */
	if (iagp->nfreeinos || addext) {
		/* determine the extent number of the hint.
		 */
		extno = ino >> L2INOSPEREXT;

		/* check if the extent containing the hint has backed
		 * inodes.  if so, try to allocate within this extent.
		 */
		if (addressPXD(&iagp->inoext[extno])) {
			bitno = ino & (INOSPEREXT - 1);
			if ((bitno =
			     diFindFree(le32_to_cpu(iagp->wmap[extno]),
					bitno))
			    < INOSPEREXT) {
				ino = (extno << L2INOSPEREXT) + bitno;

				/* a free inode (bit) was found within this
				 * extent, so allocate it.
				 */
				rc = diAllocBit(imap, iagp, ino);
				IREAD_UNLOCK(ipimap);
				if (rc) {
					assert(rc == -EIO);
				} else {
					/* set the results of the allocation
					 * and write the iag.
					 */
					diInitInode(ip, iagno, ino, extno,
						    iagp);
					mark_metapage_dirty(mp);
				}
				release_metapage(mp);

				/* free the AG lock and return.
				 */
				AG_UNLOCK(imap, agno);
				return (rc);
			}

			if (!addext)
				extno =
				    (extno ==
				     EXTSPERIAG - 1) ? 0 : extno + 1;
		}

		/*
		 * no free inodes within the extent containing the hint.
		 *
		 * try to allocate from the backed extents following
		 * hint or, if appropriate (i.e. addext is true), allocate
		 * an extent of free inodes at or following the extent
		 * containing the hint.
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		 *
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		 * the free inode and free extent summary maps are used
		 * here, so determine the starting summary map position
		 * and the number of words we'll have to examine.  again,
		 * the approach is to allocate following the hint, so we
		 * might have to initially ignore prior bits of the summary
		 * map that represent extents prior to the extent containing
		 * the hint and later revisit these bits.
		 */
		bitno = extno & (EXTSPERSUM - 1);
		nwords = (bitno == 0) ? SMAPSZ : SMAPSZ + 1;
		sword = extno >> L2EXTSPERSUM;

		/* mask any prior bits for the starting words of the
		 * summary map.
		 */
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		mask = (bitno == 0) ? 0 : (ONES << (EXTSPERSUM - bitno));
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		inosmap = le32_to_cpu(iagp->inosmap[sword]) | mask;
		extsmap = le32_to_cpu(iagp->extsmap[sword]) | mask;

		/* scan the free inode and free extent summary maps for
		 * free resources.
		 */
		for (i = 0; i < nwords; i++) {
			/* check if this word of the free inode summary
			 * map describes an extent with free inodes.
			 */
			if (~inosmap) {
				/* an extent with free inodes has been
				 * found. determine the extent number
				 * and the inode number within the extent.
				 */
				rem = diFindFree(inosmap, 0);
				extno = (sword << L2EXTSPERSUM) + rem;
				rem = diFindFree(le32_to_cpu(iagp->wmap[extno]),
						 0);
				if (rem >= INOSPEREXT) {
					IREAD_UNLOCK(ipimap);
					release_metapage(mp);
					AG_UNLOCK(imap, agno);
					jfs_error(ip->i_sb,
						  "diAlloc: can't find free bit "
						  "in wmap");
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					return -EIO;
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				}

				/* determine the inode number within the
				 * iag and allocate the inode from the
				 * map.
				 */
				ino = (extno << L2INOSPEREXT) + rem;
				rc = diAllocBit(imap, iagp, ino);
				IREAD_UNLOCK(ipimap);
				if (rc)
					assert(rc == -EIO);
				else {
					/* set the results of the allocation
					 * and write the iag.
					 */
					diInitInode(ip, iagno, ino, extno,
						    iagp);
					mark_metapage_dirty(mp);
				}
				release_metapage(mp);

				/* free the AG lock and return.
				 */
				AG_UNLOCK(imap, agno);
				return (rc);

			}

			/* check if we may allocate an extent of free
			 * inodes and whether this word of the free
			 * extents summary map describes a free extent.
			 */
			if (addext && ~extsmap) {
				/* a free extent has been found.  determine
				 * the extent number.
				 */
				rem = diFindFree(extsmap, 0);
				extno = (sword << L2EXTSPERSUM) + rem;

				/* allocate an extent of free inodes.
				 */
				if ((rc = diNewExt(imap, iagp, extno))) {
					/* if there is no disk space for a
					 * new extent, try to allocate the
					 * disk inode from somewhere else.
					 */
					if (rc == -ENOSPC)
						break;

					assert(rc == -EIO);
				} else {
					/* set the results of the allocation
					 * and write the iag.
					 */
					diInitInode(ip, iagno,
						    extno << L2INOSPEREXT,
						    extno, iagp);
					mark_metapage_dirty(mp);
				}
				release_metapage(mp);
				/* free the imap inode & the AG lock & return.
				 */
				IREAD_UNLOCK(ipimap);
				AG_UNLOCK(imap, agno);
				return (rc);
			}

			/* move on to the next set of summary map words.
			 */
			sword = (sword == SMAPSZ - 1) ? 0 : sword + 1;
			inosmap = le32_to_cpu(iagp->inosmap[sword]);
			extsmap = le32_to_cpu(iagp->extsmap[sword]);
		}
	}
	/* unlock imap inode */
	IREAD_UNLOCK(ipimap);

	/* nothing doing in this iag, so release it. */
	release_metapage(mp);

      tryag:
	/*
	 * try to allocate anywhere within the same AG as the parent inode.
	 */
	rc = diAllocAG(imap, agno, dir, ip);

	AG_UNLOCK(imap, agno);

	if (rc != -ENOSPC)
		return (rc);

	/*
	 * try to allocate in any AG.
	 */
	return (diAllocAny(imap, agno, dir, ip));
}


/*
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 * NAME:	diAllocAG(imap,agno,dir,ip)
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 *
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 * FUNCTION:	allocate a disk inode from the allocation group.
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 *
 *		this routine first determines if a new extent of free
 *		inodes should be added for the allocation group, with
 *		the current request satisfied from this extent. if this
 *		is the case, an attempt will be made to do just that.  if
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 *		this attempt fails or it has been determined that a new
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 *		extent should not be added, an attempt is made to satisfy
 *		the request by allocating an existing (backed) free inode
 *		from the allocation group.
 *
 * PRE CONDITION: Already have the AG lock for this AG.
 *
 * PARAMETERS:
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 *	imap	- pointer to inode map control structure.
 *	agno	- allocation group to allocate from.
 *	dir	- 'true' if the new disk inode is for a directory.
 *	ip	- pointer to the new inode to be filled in on successful return
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 *		  with the disk inode number allocated, its extent address
 *		  and the start of the ag.
 *
 * RETURN VALUES:
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 *	0	- success.
 *	-ENOSPC	- insufficient disk resources.
 *	-EIO	- i/o error.
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 */
static int
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diAllocAG(struct inomap * imap, int agno, bool dir, struct inode *ip)
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{
	int rc, addext, numfree, numinos;

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	/* get the number of free and the number of backed disk
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	 * inodes currently within the ag.
	 */
	numfree = imap->im_agctl[agno].numfree;
	numinos = imap->im_agctl[agno].numinos;

	if (numfree > numinos) {
		jfs_error(ip->i_sb, "diAllocAG: numfree > numinos");
		return -EIO;
	}

	/* determine if we should allocate a new extent of free inodes
	 * within the ag: for directory inodes, add a new extent
	 * if there are a small number of free inodes or number of free
	 * inodes is a small percentage of the number of backed inodes.
	 */
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	if (dir)
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		addext = (numfree < 64 ||
			  (numfree < 256
			   && ((numfree * 100) / numinos) <= 20));
	else
		addext = (numfree == 0);

	/*
	 * try to allocate a new extent of free inodes.
	 */
	if (addext) {
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		/* if free space is not available for this new extent, try
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		 * below to allocate a free and existing (already backed)
		 * inode from the ag.
		 */
		if ((rc = diAllocExt(imap, agno, ip)) != -ENOSPC)
			return (rc);
	}

	/*
	 * try to allocate an existing free inode from the ag.
	 */
	return (diAllocIno(imap, agno, ip));
}


/*
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 * NAME:	diAllocAny(imap,agno,dir,iap)
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 *
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 * FUNCTION:	allocate a disk inode from any other allocation group.
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 *
 *		this routine is called when an allocation attempt within
 *		the primary allocation group has failed. if attempts to
 *		allocate an inode from any allocation group other than the
 *		specified primary group.
 *
 * PARAMETERS:
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 *	imap	- pointer to inode map control structure.
 *	agno	- primary allocation group (to avoid).
 *	dir	- 'true' if the new disk inode is for a directory.
 *	ip	- pointer to a new inode to be filled in on successful return
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 *		  with the disk inode number allocated, its extent address
 *		  and the start of the ag.
 *
 * RETURN VALUES:
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 *	0	- success.
 *	-ENOSPC	- insufficient disk resources.
 *	-EIO	- i/o error.
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 */
static int
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diAllocAny(struct inomap * imap, int agno, bool dir, struct inode *ip)
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{
	int ag, rc;
	int maxag = JFS_SBI(imap->im_ipimap->i_sb)->bmap->db_maxag;


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	/* try to allocate from the ags following agno up to
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	 * the maximum ag number.
	 */
	for (ag = agno + 1; ag <= maxag; ag++) {
		AG_LOCK(imap, ag);

		rc = diAllocAG(imap, ag, dir, ip);

		AG_UNLOCK(imap, ag);

		if (rc != -ENOSPC)
			return (rc);
	}

	/* try to allocate from the ags in front of agno.
	 */
	for (ag = 0; ag < agno; ag++) {
		AG_LOCK(imap, ag);

		rc = diAllocAG(imap, ag, dir, ip);

		AG_UNLOCK(imap, ag);

		if (rc != -ENOSPC)
			return (rc);
	}

	/* no free disk inodes.
	 */
	return -ENOSPC;
}


/*
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 * NAME:	diAllocIno(imap,agno,ip)
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 *
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 * FUNCTION:	allocate a disk inode from the allocation group's free
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 *		inode list, returning an error if this free list is
 *		empty (i.e. no iags on the list).
 *
 *		allocation occurs from the first iag on the list using
 *		the iag's free inode summary map to find the leftmost
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 *		free inode in the iag.
 *
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 * PRE CONDITION: Already have AG lock for this AG.
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 *
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 * PARAMETERS:
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 *	imap	- pointer to inode map control structure.
 *	agno	- allocation group.
 *	ip	- pointer to new inode to be filled in on successful return
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 *		  with the disk inode number allocated, its extent address
 *		  and the start of the ag.
 *
 * RETURN VALUES:
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 *	0	- success.
 *	-ENOSPC	- insufficient disk resources.
 *	-EIO	- i/o error.
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 */
static int diAllocIno(struct inomap * imap, int agno, struct inode *ip)
{
	int iagno, ino, rc, rem, extno, sword;
	struct metapage *mp;
	struct iag *iagp;

	/* check if there are iags on the ag's free inode list.
	 */
	if ((iagno = imap->im_agctl[agno].inofree) < 0)
		return -ENOSPC;

	/* obtain read lock on imap inode */
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	IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP);
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	/* read the iag at the head of the list.
	 */
	if ((rc = diIAGRead(imap, iagno, &mp))) {
		IREAD_UNLOCK(imap->im_ipimap);
		return (rc);
	}
	iagp = (struct iag *) mp->data;

	/* better be free inodes in this iag if it is on the
	 * list.
	 */
	if (!iagp->nfreeinos) {
		IREAD_UNLOCK(imap->im_ipimap);
		release_metapage(mp);
		jfs_error(ip->i_sb,
			  "diAllocIno: nfreeinos = 0, but iag on freelist");
		return -EIO;
	}

	/* scan the free inode summary map to find an extent
	 * with free inodes.
	 */
	for (sword = 0;; sword++) {
		if (sword >= SMAPSZ) {
			IREAD_UNLOCK(imap->im_ipimap);
			release_metapage(mp);
			jfs_error(ip->i_sb,
				  "diAllocIno: free inode not found in summary map");
			return -EIO;
		}

		if (~iagp->inosmap[sword])
			break;
	}

	/* found a extent with free inodes. determine
	 * the extent number.
	 */
	rem = diFindFree(le32_to_cpu(iagp->inosmap[sword]), 0);
	if (rem >= EXTSPERSUM) {
		IREAD_UNLOCK(imap->im_ipimap);
		release_metapage(mp);
		jfs_error(ip->i_sb, "diAllocIno: no free extent found");
		return -EIO;
	}
	extno = (sword << L2EXTSPERSUM) + rem;

	/* find the first free inode in the extent.
	 */
	rem = diFindFree(le32_to_cpu(iagp->wmap[extno]), 0);
	if (rem >= INOSPEREXT) {
		IREAD_UNLOCK(imap->im_ipimap);
		release_metapage(mp);
		jfs_error(ip->i_sb, "diAllocIno: free inode not found");
		return -EIO;
	}

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	/* compute the inode number within the iag.
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	 */
	ino = (extno << L2INOSPEREXT) + rem;

	/* allocate the inode.
	 */
	rc = diAllocBit(imap, iagp, ino);
	IREAD_UNLOCK(imap->im_ipimap);
	if (rc) {
		release_metapage(mp);
		return (rc);
	}

	/* set the results of the allocation and write the iag.
	 */
	diInitInode(ip, iagno, ino, extno, iagp);
	write_metapage(mp);

	return (0);
}


/*
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 * NAME:	diAllocExt(imap,agno,ip)
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 *
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 * FUNCTION:	add a new extent of free inodes to an iag, allocating
 *		an inode from this extent to satisfy the current allocation
 *		request.
 *
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 *		this routine first tries to find an existing iag with free
 *		extents through the ag free extent list.  if list is not
 *		empty, the head of the list will be selected as the home
 *		of the new extent of free inodes.  otherwise (the list is
 *		empty), a new iag will be allocated for the ag to contain
 *		the extent.
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 *
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 *		once an iag has been selected, the free extent summary map
 *		is used to locate a free extent within the iag and diNewExt()
 *		is called to initialize the extent, with initialization
 *		including the allocation of the first inode of the extent
 *		for the purpose of satisfying this request.
 *
 * PARAMETERS:
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 *	imap	- pointer to inode map control structure.
 *	agno	- allocation group number.
 *	ip	- pointer to new inode to be filled in on successful return
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 *		  with the disk inode number allocated, its extent address
 *		  and the start of the ag.
 *
 * RETURN VALUES:
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 *	0	- success.
 *	-ENOSPC	- insufficient disk resources.
 *	-EIO	- i/o error.
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 */
static int diAllocExt(struct inomap * imap, int agno, struct inode *ip)
{
	int rem, iagno, sword, extno, rc;
	struct metapage *mp;
	struct iag *iagp;

	/* check if the ag has any iags with free extents.  if not,
	 * allocate a new iag for the ag.
	 */
	if ((iagno = imap->im_agctl[agno].extfree) < 0) {
		/* If successful, diNewIAG will obtain the read lock on the
		 * imap inode.
		 */
		if ((rc = diNewIAG(imap, &iagno, agno, &mp))) {
			return (rc);
		}
		iagp = (struct iag *) mp->data;

		/* set the ag number if this a brand new iag
		 */
		iagp->agstart =
		    cpu_to_le64(AGTOBLK(agno, imap->im_ipimap));
	} else {
		/* read the iag.
		 */
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		IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP);
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		if ((rc = diIAGRead(imap, iagno, &mp))) {
			IREAD_UNLOCK(imap->im_ipimap);
			jfs_error(ip->i_sb, "diAllocExt: error reading iag");
			return rc;
		}
		iagp = (struct iag *) mp->data;
	}

	/* using the free extent summary map, find a free extent.
	 */
	for (sword = 0;; sword++) {
		if (sword >= SMAPSZ) {
			release_metapage(mp);
			IREAD_UNLOCK(imap->im_ipimap);
			jfs_error(ip->i_sb,
				  "diAllocExt: free ext summary map not found");
			return -EIO;
		}
		if (~iagp->extsmap[sword])
			break;
	}

	/* determine the extent number of the free extent.
	 */
	rem = diFindFree(le32_to_cpu(iagp->extsmap[sword]), 0);
	if (rem >= EXTSPERSUM) {
		release_metapage(mp);
		IREAD_UNLOCK(imap->im_ipimap);
		jfs_error(ip->i_sb, "diAllocExt: free extent not found");
		return -EIO;
	}
	extno = (sword << L2EXTSPERSUM) + rem;

	/* initialize the new extent.
	 */