[net-next-2.6.git] / fs / jfs / super.c

/*
 *   Copyright (C) International Business Machines Corp., 2000-2004
 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or 
 *   (at your option) any later version.
 * 
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software 
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/fs.h>
#include <linux/config.h>
#include <linux/module.h>
#include <linux/parser.h>
#include <linux/completion.h>
#include <linux/vfs.h>
#include <linux/mount.h>
#include <linux/moduleparam.h>
#include <linux/posix_acl.h>
#include <asm/uaccess.h>
#include <linux/seq_file.h>

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

MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
MODULE_LICENSE("GPL");

static kmem_cache_t * jfs_inode_cachep;

static struct super_operations jfs_super_operations;
static struct export_operations jfs_export_operations;
static struct file_system_type jfs_fs_type;

#define MAX_COMMIT_THREADS 64
static int commit_threads = 0;
module_param(commit_threads, int, 0);
MODULE_PARM_DESC(commit_threads, "Number of commit threads");

int jfs_stop_threads;
static pid_t jfsIOthread;
static pid_t jfsCommitThread[MAX_COMMIT_THREADS];
static pid_t jfsSyncThread;
DECLARE_COMPLETION(jfsIOwait);

#ifdef CONFIG_JFS_DEBUG
int jfsloglevel = JFS_LOGLEVEL_WARN;
module_param(jfsloglevel, int, 0644);
MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
#endif

static void jfs_handle_error(struct super_block *sb)
{
	struct jfs_sb_info *sbi = JFS_SBI(sb);

	if (sb->s_flags & MS_RDONLY)
		return;

	updateSuper(sb, FM_DIRTY);

	if (sbi->flag & JFS_ERR_PANIC)
		panic("JFS (device %s): panic forced after error\n",
			sb->s_id);
	else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
		jfs_err("ERROR: (device %s): remounting filesystem "
			"as read-only\n",
			sb->s_id);
		sb->s_flags |= MS_RDONLY;
	} 

	/* nothing is done for continue beyond marking the superblock dirty */
}

void jfs_error(struct super_block *sb, const char * function, ...)
{
	static char error_buf[256];
	va_list args;

	va_start(args, function);
	vsprintf(error_buf, function, args);
	va_end(args);

	printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);

	jfs_handle_error(sb);
}

static struct inode *jfs_alloc_inode(struct super_block *sb)
{
	struct jfs_inode_info *jfs_inode;

	jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
	if (!jfs_inode)
		return NULL;
	return &jfs_inode->vfs_inode;
}

static void jfs_destroy_inode(struct inode *inode)
{
	struct jfs_inode_info *ji = JFS_IP(inode);

	BUG_ON(!list_empty(&ji->anon_inode_list));

	spin_lock_irq(&ji->ag_lock);
	if (ji->active_ag != -1) {
		struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
		atomic_dec(&bmap->db_active[ji->active_ag]);
		ji->active_ag = -1;
	}
	spin_unlock_irq(&ji->ag_lock);

#ifdef CONFIG_JFS_POSIX_ACL
	if (ji->i_acl != JFS_ACL_NOT_CACHED) {
		posix_acl_release(ji->i_acl);
		ji->i_acl = JFS_ACL_NOT_CACHED;
	}
	if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
		posix_acl_release(ji->i_default_acl);
		ji->i_default_acl = JFS_ACL_NOT_CACHED;
	}
#endif

	kmem_cache_free(jfs_inode_cachep, ji);
}

static int jfs_statfs(struct super_block *sb, struct kstatfs *buf)
{
	struct jfs_sb_info *sbi = JFS_SBI(sb);
	s64 maxinodes;
	struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;

	jfs_info("In jfs_statfs");
	buf->f_type = JFS_SUPER_MAGIC;
	buf->f_bsize = sbi->bsize;
	buf->f_blocks = sbi->bmap->db_mapsize;
	buf->f_bfree = sbi->bmap->db_nfree;
	buf->f_bavail = sbi->bmap->db_nfree;
	/*
	 * If we really return the number of allocated & free inodes, some
	 * applications will fail because they won't see enough free inodes.
	 * We'll try to calculate some guess as to how may inodes we can
	 * really allocate
	 *
	 * buf->f_files = atomic_read(&imap->im_numinos);
	 * buf->f_ffree = atomic_read(&imap->im_numfree);
	 */
	maxinodes = min((s64) atomic_read(&imap->im_numinos) +
			((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
			 << L2INOSPEREXT), (s64) 0xffffffffLL);
	buf->f_files = maxinodes;
	buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
				    atomic_read(&imap->im_numfree));

	buf->f_namelen = JFS_NAME_MAX;
	return 0;
}

static void jfs_put_super(struct super_block *sb)
{
	struct jfs_sb_info *sbi = JFS_SBI(sb);
	int rc;

	jfs_info("In jfs_put_super");
	rc = jfs_umount(sb);
	if (rc)
		jfs_err("jfs_umount failed with return code %d", rc);
	if (sbi->nls_tab)
		unload_nls(sbi->nls_tab);
	sbi->nls_tab = NULL;

	truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
	iput(sbi->direct_inode);
	sbi->direct_inode = NULL;

	kfree(sbi);
}

enum {
	Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
	Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
	Opt_usrquota, Opt_grpquota
};

static match_table_t tokens = {
	{Opt_integrity, "integrity"},
	{Opt_nointegrity, "nointegrity"},
	{Opt_iocharset, "iocharset=%s"},
	{Opt_resize, "resize=%u"},
	{Opt_resize_nosize, "resize"},
	{Opt_errors, "errors=%s"},
	{Opt_ignore, "noquota"},
	{Opt_ignore, "quota"},
	{Opt_usrquota, "usrquota"},
	{Opt_grpquota, "grpquota"},
	{Opt_err, NULL}
};

static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
			 int *flag)
{
	void *nls_map = (void *)-1;	/* -1: no change;  NULL: none */
	char *p;
	struct jfs_sb_info *sbi = JFS_SBI(sb);

	*newLVSize = 0;

	if (!options)
		return 1;

	while ((p = strsep(&options, ",")) != NULL) {
		substring_t args[MAX_OPT_ARGS];
		int token;
		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_integrity:
			*flag &= ~JFS_NOINTEGRITY;
			break;
		case Opt_nointegrity:
			*flag |= JFS_NOINTEGRITY;
			break;
		case Opt_ignore:
			/* Silently ignore the quota options */
			/* Don't do anything ;-) */
			break;
		case Opt_iocharset:
			if (nls_map && nls_map != (void *) -1)
				unload_nls(nls_map);
			if (!strcmp(args[0].from, "none"))
				nls_map = NULL;
			else {
				nls_map = load_nls(args[0].from);
				if (!nls_map) {
					printk(KERN_ERR
					       "JFS: charset not found\n");
					goto cleanup;
				}
			}
			break;
		case Opt_resize:
		{
			char *resize = args[0].from;
			*newLVSize = simple_strtoull(resize, &resize, 0);
			break;
		}
		case Opt_resize_nosize:
		{
			*newLVSize = sb->s_bdev->bd_inode->i_size >>
				sb->s_blocksize_bits;
			if (*newLVSize == 0)
				printk(KERN_ERR
				       "JFS: Cannot determine volume size\n");
			break;
		}
		case Opt_errors:
		{
			char *errors = args[0].from;
			if (!errors || !*errors)
				goto cleanup;
			if (!strcmp(errors, "continue")) {
				*flag &= ~JFS_ERR_REMOUNT_RO;
				*flag &= ~JFS_ERR_PANIC;
				*flag |= JFS_ERR_CONTINUE;
			} else if (!strcmp(errors, "remount-ro")) {
				*flag &= ~JFS_ERR_CONTINUE;
				*flag &= ~JFS_ERR_PANIC;
				*flag |= JFS_ERR_REMOUNT_RO;
			} else if (!strcmp(errors, "panic")) {
				*flag &= ~JFS_ERR_CONTINUE;
				*flag &= ~JFS_ERR_REMOUNT_RO;
				*flag |= JFS_ERR_PANIC;
			} else {
				printk(KERN_ERR
				       "JFS: %s is an invalid error handler\n",
				       errors);
				goto cleanup;
			}
			break;
		}

#if defined(CONFIG_QUOTA)
		case Opt_quota:
		case Opt_usrquota:
			*flag |= JFS_USRQUOTA;
			break;
		case Opt_grpquota:
			*flag |= JFS_GRPQUOTA;
			break;
#else
		case Opt_usrquota:
		case Opt_grpquota:
		case Opt_quota:
			printk(KERN_ERR
			       "JFS: quota operations not supported\n");
			break;
#endif

		default:
			printk("jfs: Unrecognized mount option \"%s\" "
					" or missing value\n", p);
			goto cleanup;
		}
	}

	if (nls_map != (void *) -1) {
		/* Discard old (if remount) */
		if (sbi->nls_tab)
			unload_nls(sbi->nls_tab);
		sbi->nls_tab = nls_map;
	}
	return 1;

cleanup:
	if (nls_map && nls_map != (void *) -1)
		unload_nls(nls_map);
	return 0;
}

static int jfs_remount(struct super_block *sb, int *flags, char *data)
{
	s64 newLVSize = 0;
	int rc = 0;
	int flag = JFS_SBI(sb)->flag;

	if (!parse_options(data, sb, &newLVSize, &flag)) {
		return -EINVAL;
	}
	if (newLVSize) {
		if (sb->s_flags & MS_RDONLY) {
			printk(KERN_ERR
		  "JFS: resize requires volume to be mounted read-write\n");
			return -EROFS;
		}
		rc = jfs_extendfs(sb, newLVSize, 0);
		if (rc)
			return rc;
	}

	if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
		/*
		 * Invalidate any previously read metadata.  fsck may have
		 * changed the on-disk data since we mounted r/o
		 */
		truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);

		JFS_SBI(sb)->flag = flag;
		return jfs_mount_rw(sb, 1);
	}
	if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
		rc = jfs_umount_rw(sb);
		JFS_SBI(sb)->flag = flag;
		return rc;
	}
	if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
		if (!(sb->s_flags & MS_RDONLY)) {
			rc = jfs_umount_rw(sb);
			if (rc)
				return rc;
			JFS_SBI(sb)->flag = flag;
			return jfs_mount_rw(sb, 1);
		}
	JFS_SBI(sb)->flag = flag;

	return 0;
}

static int jfs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct jfs_sb_info *sbi;
	struct inode *inode;
	int rc;
	s64 newLVSize = 0;
	int flag;

	jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);

	if (!new_valid_dev(sb->s_bdev->bd_dev))
		return -EOVERFLOW;

	sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
	if (!sbi)
		return -ENOSPC;
	memset(sbi, 0, sizeof (struct jfs_sb_info));
	sb->s_fs_info = sbi;
	sbi->sb = sb;

	/* initialize the mount flag and determine the default error handler */
	flag = JFS_ERR_REMOUNT_RO;

	if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
		kfree(sbi);
		return -EINVAL;
	}
	sbi->flag = flag;

#ifdef CONFIG_JFS_POSIX_ACL
	sb->s_flags |= MS_POSIXACL;
#endif

	if (newLVSize) {
		printk(KERN_ERR "resize option for remount only\n");
		return -EINVAL;
	}

	/*
	 * Initialize blocksize to 4K.
	 */
	sb_set_blocksize(sb, PSIZE);

	/*
	 * Set method vectors.
	 */
	sb->s_op = &jfs_super_operations;
	sb->s_export_op = &jfs_export_operations;

	/*
	 * Initialize direct-mapping inode/address-space
	 */
	inode = new_inode(sb);
	if (inode == NULL)
		goto out_kfree;
	inode->i_ino = 0;
	inode->i_nlink = 1;
	inode->i_size = sb->s_bdev->bd_inode->i_size;
	inode->i_mapping->a_ops = &jfs_metapage_aops;
	insert_inode_hash(inode);
	mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);

	sbi->direct_inode = inode;

	rc = jfs_mount(sb);
	if (rc) {
		if (!silent) {
			jfs_err("jfs_mount failed w/return code = %d", rc);
		}
		goto out_mount_failed;
	}
	if (sb->s_flags & MS_RDONLY)
		sbi->log = NULL;
	else {
		rc = jfs_mount_rw(sb, 0);
		if (rc) {
			if (!silent) {
				jfs_err("jfs_mount_rw failed, return code = %d",
					rc);
			}
			goto out_no_rw;
		}
	}

	sb->s_magic = JFS_SUPER_MAGIC;

	inode = iget(sb, ROOT_I);
	if (!inode || is_bad_inode(inode))
		goto out_no_root;
	sb->s_root = d_alloc_root(inode);
	if (!sb->s_root)
		goto out_no_root;

	if (sbi->mntflag & JFS_OS2)
		sb->s_root->d_op = &jfs_ci_dentry_operations;

	/* logical blocks are represented by 40 bits in pxd_t, etc. */
	sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
#if BITS_PER_LONG == 32
	/*
	 * Page cache is indexed by long.
	 * I would use MAX_LFS_FILESIZE, but it's only half as big
	 */
	sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
#endif
	sb->s_time_gran = 1;
	return 0;

out_no_root:
	jfs_err("jfs_read_super: get root inode failed");
	if (inode)
		iput(inode);

out_no_rw:
	rc = jfs_umount(sb);
	if (rc) {
		jfs_err("jfs_umount failed with return code %d", rc);
	}
out_mount_failed:
	filemap_write_and_wait(sbi->direct_inode->i_mapping);
	truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
	make_bad_inode(sbi->direct_inode);
	iput(sbi->direct_inode);
	sbi->direct_inode = NULL;
out_kfree:
	if (sbi->nls_tab)
		unload_nls(sbi->nls_tab);
	kfree(sbi);
	return -EINVAL;
}

static void jfs_write_super_lockfs(struct super_block *sb)
{
	struct jfs_sb_info *sbi = JFS_SBI(sb);
	struct jfs_log *log = sbi->log;

	if (!(sb->s_flags & MS_RDONLY)) {
		txQuiesce(sb);
		lmLogShutdown(log);
		updateSuper(sb, FM_CLEAN);
	}
}

static void jfs_unlockfs(struct super_block *sb)
{
	struct jfs_sb_info *sbi = JFS_SBI(sb);
	struct jfs_log *log = sbi->log;
	int rc = 0;

	if (!(sb->s_flags & MS_RDONLY)) {
		updateSuper(sb, FM_MOUNT);
		if ((rc = lmLogInit(log)))
			jfs_err("jfs_unlock failed with return code %d", rc);
		else
			txResume(sb);
	}
}

static struct super_block *jfs_get_sb(struct file_system_type *fs_type, 
	int flags, const char *dev_name, void *data)
{
	return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
}

static int jfs_sync_fs(struct super_block *sb, int wait)
{
	struct jfs_log *log = JFS_SBI(sb)->log;

	/* log == NULL indicates read-only mount */
	if (log) {
		jfs_flush_journal(log, wait);
		jfs_syncpt(log, 0);
	}

	return 0;
}

static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
{
	struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);

	if (sbi->flag & JFS_NOINTEGRITY)
		seq_puts(seq, ",nointegrity");
	else
		seq_puts(seq, ",integrity");

#if defined(CONFIG_QUOTA)
	if (sbi->flag & JFS_USRQUOTA)
		seq_puts(seq, ",usrquota");

	if (sbi->flag & JFS_GRPQUOTA)
		seq_puts(seq, ",grpquota");
#endif

	return 0;
}

static struct super_operations jfs_super_operations = {
	.alloc_inode	= jfs_alloc_inode,
	.destroy_inode	= jfs_destroy_inode,
	.read_inode	= jfs_read_inode,
	.dirty_inode	= jfs_dirty_inode,
	.write_inode	= jfs_write_inode,
	.delete_inode	= jfs_delete_inode,
	.put_super	= jfs_put_super,
	.sync_fs	= jfs_sync_fs,
	.write_super_lockfs = jfs_write_super_lockfs,
	.unlockfs       = jfs_unlockfs,
	.statfs		= jfs_statfs,
	.remount_fs	= jfs_remount,
	.show_options	= jfs_show_options
};

static struct export_operations jfs_export_operations = {
	.get_parent	= jfs_get_parent,
};

static struct file_system_type jfs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "jfs",
	.get_sb		= jfs_get_sb,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};

static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
{
	struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;

	if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
	    SLAB_CTOR_CONSTRUCTOR) {
		memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
		INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
		init_rwsem(&jfs_ip->rdwrlock);
		init_MUTEX(&jfs_ip->commit_sem);
		init_rwsem(&jfs_ip->xattr_sem);
		spin_lock_init(&jfs_ip->ag_lock);
		jfs_ip->active_ag = -1;
#ifdef CONFIG_JFS_POSIX_ACL
		jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
		jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
#endif
		inode_init_once(&jfs_ip->vfs_inode);
	}
}

static int __init init_jfs_fs(void)
{
	int i;
	int rc;

	jfs_inode_cachep =
	    kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 
			    SLAB_RECLAIM_ACCOUNT, init_once, NULL);
	if (jfs_inode_cachep == NULL)
		return -ENOMEM;

	/*
	 * Metapage initialization
	 */
	rc = metapage_init();
	if (rc) {
		jfs_err("metapage_init failed w/rc = %d", rc);
		goto free_slab;
	}

	/*
	 * Transaction Manager initialization
	 */
	rc = txInit();
	if (rc) {
		jfs_err("txInit failed w/rc = %d", rc);
		goto free_metapage;
	}

	/*
	 * I/O completion thread (endio)
	 */
	jfsIOthread = kernel_thread(jfsIOWait, NULL, CLONE_KERNEL);
	if (jfsIOthread < 0) {
		jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
		goto end_txmngr;
	}
	wait_for_completion(&jfsIOwait);	/* Wait until thread starts */

	if (commit_threads < 1)
		commit_threads = num_online_cpus();
	if (commit_threads > MAX_COMMIT_THREADS)
		commit_threads = MAX_COMMIT_THREADS;

	for (i = 0; i < commit_threads; i++) {
		jfsCommitThread[i] = kernel_thread(jfs_lazycommit, NULL,
						   CLONE_KERNEL);
		if (jfsCommitThread[i] < 0) {
			jfs_err("init_jfs_fs: fork failed w/rc = %d",
				jfsCommitThread[i]);
			commit_threads = i;
			goto kill_committask;
		}
		/* Wait until thread starts */
		wait_for_completion(&jfsIOwait);
	}

	jfsSyncThread = kernel_thread(jfs_sync, NULL, CLONE_KERNEL);
	if (jfsSyncThread < 0) {
		jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
		goto kill_committask;
	}
	wait_for_completion(&jfsIOwait);	/* Wait until thread starts */

#ifdef PROC_FS_JFS
	jfs_proc_init();
#endif

	return register_filesystem(&jfs_fs_type);

kill_committask:
	jfs_stop_threads = 1;
	wake_up_all(&jfs_commit_thread_wait);
	for (i = 0; i < commit_threads; i++)
		wait_for_completion(&jfsIOwait);

	wake_up(&jfs_IO_thread_wait);
	wait_for_completion(&jfsIOwait);	/* Wait for thread exit */
end_txmngr:
	txExit();
free_metapage:
	metapage_exit();
free_slab:
	kmem_cache_destroy(jfs_inode_cachep);
	return rc;
}

static void __exit exit_jfs_fs(void)
{
	int i;

	jfs_info("exit_jfs_fs called");

	jfs_stop_threads = 1;
	txExit();
	metapage_exit();
	wake_up(&jfs_IO_thread_wait);
	wait_for_completion(&jfsIOwait);	/* Wait until IO thread exits */
	wake_up_all(&jfs_commit_thread_wait);
	for (i = 0; i < commit_threads; i++)
		wait_for_completion(&jfsIOwait);
	wake_up(&jfs_sync_thread_wait);
	wait_for_completion(&jfsIOwait);	/* Wait until Sync thread exits */
#ifdef PROC_FS_JFS
	jfs_proc_clean();
#endif
	unregister_filesystem(&jfs_fs_type);
	kmem_cache_destroy(jfs_inode_cachep);
}

module_init(init_jfs_fs)
module_exit(exit_jfs_fs)
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (C) International Business Machines Corp., 2000-2004
	3	* Portions Copyright (C) Christoph Hellwig, 2001-2002
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	13	* the GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*/
	19
	20	#include <linux/fs.h>
	21	#include <linux/config.h>
	22	#include <linux/module.h>
	23	#include <linux/parser.h>
	24	#include <linux/completion.h>
	25	#include <linux/vfs.h>
8fc2751b	26	#include <linux/mount.h>
1da177e4	27	#include <linux/moduleparam.h>
9a59f452	28	#include <linux/posix_acl.h>
1da177e4	29	#include <asm/uaccess.h>
8fc2751b	30	#include <linux/seq_file.h>
1da177e4 LT	31
	32	#include "jfs_incore.h"
	33	#include "jfs_filsys.h"
1868f4aa	34	#include "jfs_inode.h"
1da177e4 LT	35	#include "jfs_metapage.h"
	36	#include "jfs_superblock.h"
	37	#include "jfs_dmap.h"
	38	#include "jfs_imap.h"
	39	#include "jfs_acl.h"
	40	#include "jfs_debug.h"
	41
	42	MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
	43	MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
	44	MODULE_LICENSE("GPL");
	45
	46	static kmem_cache_t * jfs_inode_cachep;
	47
	48	static struct super_operations jfs_super_operations;
	49	static struct export_operations jfs_export_operations;
	50	static struct file_system_type jfs_fs_type;
	51
	52	#define MAX_COMMIT_THREADS 64
	53	static int commit_threads = 0;
	54	module_param(commit_threads, int, 0);
	55	MODULE_PARM_DESC(commit_threads, "Number of commit threads");
	56
	57	int jfs_stop_threads;
	58	static pid_t jfsIOthread;
	59	static pid_t jfsCommitThread[MAX_COMMIT_THREADS];
	60	static pid_t jfsSyncThread;
	61	DECLARE_COMPLETION(jfsIOwait);
	62
	63	#ifdef CONFIG_JFS_DEBUG
	64	int jfsloglevel = JFS_LOGLEVEL_WARN;
	65	module_param(jfsloglevel, int, 0644);
	66	MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
	67	#endif
	68
1da177e4 LT	69	static void jfs_handle_error(struct super_block *sb)
	70	{
	71	struct jfs_sb_info *sbi = JFS_SBI(sb);
	72
	73	if (sb->s_flags & MS_RDONLY)
	74	return;
	75
	76	updateSuper(sb, FM_DIRTY);
	77
	78	if (sbi->flag & JFS_ERR_PANIC)
	79	panic("JFS (device %s): panic forced after error\n",
	80	sb->s_id);
	81	else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
	82	jfs_err("ERROR: (device %s): remounting filesystem "
	83	"as read-only\n",
	84	sb->s_id);
	85	sb->s_flags \|= MS_RDONLY;
	86	}
	87
	88	/* nothing is done for continue beyond marking the superblock dirty */
	89	}
	90
	91	void jfs_error(struct super_block sb, const char function, ...)
	92	{
	93	static char error_buf[256];
	94	va_list args;
	95
	96	va_start(args, function);
	97	vsprintf(error_buf, function, args);
	98	va_end(args);
	99
	100	printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
	101
	102	jfs_handle_error(sb);
	103	}
	104
	105	static struct inode jfs_alloc_inode(struct super_block sb)
	106	{
	107	struct jfs_inode_info *jfs_inode;
	108
	109	jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
	110	if (!jfs_inode)
	111	return NULL;
	112	return &jfs_inode->vfs_inode;
	113	}
	114
	115	static void jfs_destroy_inode(struct inode *inode)
	116	{
	117	struct jfs_inode_info *ji = JFS_IP(inode);
	118
8a9cd6d6 DK	119	BUG_ON(!list_empty(&ji->anon_inode_list));
8a9cd6d6 DK	120
1da177e4 LT	121	spin_lock_irq(&ji->ag_lock);
	122	if (ji->active_ag != -1) {
	123	struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
	124	atomic_dec(&bmap->db_active[ji->active_ag]);
	125	ji->active_ag = -1;
	126	}
	127	spin_unlock_irq(&ji->ag_lock);
	128
	129	#ifdef CONFIG_JFS_POSIX_ACL
	130	if (ji->i_acl != JFS_ACL_NOT_CACHED) {
	131	posix_acl_release(ji->i_acl);
	132	ji->i_acl = JFS_ACL_NOT_CACHED;
	133	}
	134	if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
	135	posix_acl_release(ji->i_default_acl);
	136	ji->i_default_acl = JFS_ACL_NOT_CACHED;
	137	}
	138	#endif
	139
	140	kmem_cache_free(jfs_inode_cachep, ji);
	141	}
	142
	143	static int jfs_statfs(struct super_block sb, struct kstatfs buf)
	144	{
	145	struct jfs_sb_info *sbi = JFS_SBI(sb);
	146	s64 maxinodes;
	147	struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
	148
	149	jfs_info("In jfs_statfs");
	150	buf->f_type = JFS_SUPER_MAGIC;
	151	buf->f_bsize = sbi->bsize;
	152	buf->f_blocks = sbi->bmap->db_mapsize;
	153	buf->f_bfree = sbi->bmap->db_nfree;
	154	buf->f_bavail = sbi->bmap->db_nfree;
	155	/*
	156	* If we really return the number of allocated & free inodes, some
	157	* applications will fail because they won't see enough free inodes.
	158	* We'll try to calculate some guess as to how may inodes we can
	159	* really allocate
	160	*
	161	* buf->f_files = atomic_read(&imap->im_numinos);
	162	* buf->f_ffree = atomic_read(&imap->im_numfree);
	163	*/
	164	maxinodes = min((s64) atomic_read(&imap->im_numinos) +
	165	((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
	166	<< L2INOSPEREXT), (s64) 0xffffffffLL);
	167	buf->f_files = maxinodes;
	168	buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
	169	atomic_read(&imap->im_numfree));
	170
	171	buf->f_namelen = JFS_NAME_MAX;
	172	return 0;
	173	}
	174
	175	static void jfs_put_super(struct super_block *sb)
	176	{
	177	struct jfs_sb_info *sbi = JFS_SBI(sb);
	178	int rc;
	179
	180	jfs_info("In jfs_put_super");
	181	rc = jfs_umount(sb);
	182	if (rc)
	183	jfs_err("jfs_umount failed with return code %d", rc);
	184	if (sbi->nls_tab)
185	unload_nls(sbi->nls_tab);
186	sbi->nls_tab = NULL;
187
7fab479b DK	188	truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
	189	iput(sbi->direct_inode);
	190	sbi->direct_inode = NULL;
	191
1da177e4 LT	192	kfree(sbi);
	193	}
	194
	195	enum {
	196	Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
8fc2751b MB	197	Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
8fc2751b MB	198	Opt_usrquota, Opt_grpquota
1da177e4 LT	199	};
	200
	201	static match_table_t tokens = {
	202	{Opt_integrity, "integrity"},
	203	{Opt_nointegrity, "nointegrity"},
	204	{Opt_iocharset, "iocharset=%s"},
	205	{Opt_resize, "resize=%u"},
	206	{Opt_resize_nosize, "resize"},
	207	{Opt_errors, "errors=%s"},
	208	{Opt_ignore, "noquota"},
	209	{Opt_ignore, "quota"},
8fc2751b MB	210	{Opt_usrquota, "usrquota"},
8fc2751b MB	211	{Opt_grpquota, "grpquota"},
1da177e4 LT	212	{Opt_err, NULL}
	213	};
	214
	215	static int parse_options(char options, struct super_block sb, s64 *newLVSize,
	216	int *flag)
	217	{
	218	void nls_map = (void )-1; /* -1: no change; NULL: none */
	219	char *p;
	220	struct jfs_sb_info *sbi = JFS_SBI(sb);
	221
	222	*newLVSize = 0;
	223
	224	if (!options)
	225	return 1;
	226
	227	while ((p = strsep(&options, ",")) != NULL) {
	228	substring_t args[MAX_OPT_ARGS];
	229	int token;
	230	if (!*p)
	231	continue;
	232
	233	token = match_token(p, tokens, args);
	234	switch (token) {
	235	case Opt_integrity:
	236	*flag &= ~JFS_NOINTEGRITY;
	237	break;
	238	case Opt_nointegrity:
	239	*flag \|= JFS_NOINTEGRITY;
	240	break;
	241	case Opt_ignore:
	242	/* Silently ignore the quota options */
	243	/* Don't do anything ;-) */
	244	break;
	245	case Opt_iocharset:
	246	if (nls_map && nls_map != (void *) -1)
	247	unload_nls(nls_map);
	248	if (!strcmp(args[0].from, "none"))
	249	nls_map = NULL;
	250	else {
	251	nls_map = load_nls(args[0].from);
	252	if (!nls_map) {
	253	printk(KERN_ERR
	254	"JFS: charset not found\n");
	255	goto cleanup;
	256	}
	257	}
	258	break;
	259	case Opt_resize:
	260	{
	261	char *resize = args[0].from;
	262	*newLVSize = simple_strtoull(resize, &resize, 0);
	263	break;
	264	}
	265	case Opt_resize_nosize:
	266	{
	267	*newLVSize = sb->s_bdev->bd_inode->i_size >>
	268	sb->s_blocksize_bits;
	269	if (*newLVSize == 0)
	270	printk(KERN_ERR
	271	"JFS: Cannot determine volume size\n");
	272	break;
	273	}
	274	case Opt_errors:
	275	{
276	char *errors = args[0].from;
277	if (!errors \|\| !*errors)
278	goto cleanup;
279	if (!strcmp(errors, "continue")) {
280	*flag &= ~JFS_ERR_REMOUNT_RO;
281	*flag &= ~JFS_ERR_PANIC;
282	*flag \|= JFS_ERR_CONTINUE;
283	} else if (!strcmp(errors, "remount-ro")) {
284	*flag &= ~JFS_ERR_CONTINUE;
285	*flag &= ~JFS_ERR_PANIC;
286	*flag \|= JFS_ERR_REMOUNT_RO;
287	} else if (!strcmp(errors, "panic")) {
288	*flag &= ~JFS_ERR_CONTINUE;
289	*flag &= ~JFS_ERR_REMOUNT_RO;
290	*flag \|= JFS_ERR_PANIC;
291	} else {
292	printk(KERN_ERR
293	"JFS: %s is an invalid error handler\n",
294	errors);
295	goto cleanup;
296	}
297	break;
298	}
8fc2751b MB	299
	300	#if defined(CONFIG_QUOTA)
	301	case Opt_quota:
	302	case Opt_usrquota:
	303	*flag \|= JFS_USRQUOTA;
	304	break;
	305	case Opt_grpquota:
	306	*flag \|= JFS_GRPQUOTA;
	307	break;
	308	#else
	309	case Opt_usrquota:
	310	case Opt_grpquota:
	311	case Opt_quota:
	312	printk(KERN_ERR
	313	"JFS: quota operations not supported\n");
	314	break;
	315	#endif
	316
1da177e4 LT	317	default:
	318	printk("jfs: Unrecognized mount option \"%s\" "
	319	" or missing value\n", p);
	320	goto cleanup;
	321	}
	322	}
	323
	324	if (nls_map != (void *) -1) {
	325	/* Discard old (if remount) */
	326	if (sbi->nls_tab)
	327	unload_nls(sbi->nls_tab);
	328	sbi->nls_tab = nls_map;
	329	}
	330	return 1;
	331
	332	cleanup:
	333	if (nls_map && nls_map != (void *) -1)
	334	unload_nls(nls_map);
	335	return 0;
	336	}
	337
	338	static int jfs_remount(struct super_block sb, int flags, char *data)
	339	{
	340	s64 newLVSize = 0;
	341	int rc = 0;
	342	int flag = JFS_SBI(sb)->flag;
	343
	344	if (!parse_options(data, sb, &newLVSize, &flag)) {
	345	return -EINVAL;
	346	}
	347	if (newLVSize) {
	348	if (sb->s_flags & MS_RDONLY) {
	349	printk(KERN_ERR
	350	"JFS: resize requires volume to be mounted read-write\n");
	351	return -EROFS;
	352	}
	353	rc = jfs_extendfs(sb, newLVSize, 0);
	354	if (rc)
	355	return rc;
	356	}
	357
	358	if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
7fab479b DK	359	/*
	360	* Invalidate any previously read metadata. fsck may have
	361	* changed the on-disk data since we mounted r/o
	362	*/
	363	truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
	364
1da177e4 LT	365	JFS_SBI(sb)->flag = flag;
	366	return jfs_mount_rw(sb, 1);
	367	}
	368	if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
	369	rc = jfs_umount_rw(sb);
	370	JFS_SBI(sb)->flag = flag;
	371	return rc;
	372	}
	373	if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
	374	if (!(sb->s_flags & MS_RDONLY)) {
	375	rc = jfs_umount_rw(sb);
	376	if (rc)
	377	return rc;
	378	JFS_SBI(sb)->flag = flag;
	379	return jfs_mount_rw(sb, 1);
	380	}
	381	JFS_SBI(sb)->flag = flag;
	382
	383	return 0;
	384	}
	385
	386	static int jfs_fill_super(struct super_block sb, void data, int silent)
	387	{
	388	struct jfs_sb_info *sbi;
	389	struct inode *inode;
	390	int rc;
	391	s64 newLVSize = 0;
	392	int flag;
	393
	394	jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
	395
	396	if (!new_valid_dev(sb->s_bdev->bd_dev))
	397	return -EOVERFLOW;
	398
	399	sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
	400	if (!sbi)
	401	return -ENOSPC;
	402	memset(sbi, 0, sizeof (struct jfs_sb_info));
	403	sb->s_fs_info = sbi;
	404	sbi->sb = sb;
	405
	406	/* initialize the mount flag and determine the default error handler */
	407	flag = JFS_ERR_REMOUNT_RO;
	408
	409	if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
	410	kfree(sbi);
	411	return -EINVAL;
	412	}
	413	sbi->flag = flag;
	414
	415	#ifdef CONFIG_JFS_POSIX_ACL
	416	sb->s_flags \|= MS_POSIXACL;
	417	#endif
	418
	419	if (newLVSize) {
	420	printk(KERN_ERR "resize option for remount only\n");
	421	return -EINVAL;
	422	}
	423
	424	/*
	425	* Initialize blocksize to 4K.
	426	*/
	427	sb_set_blocksize(sb, PSIZE);
	428
429	/*
430	* Set method vectors.
431	*/
432	sb->s_op = &jfs_super_operations;
433	sb->s_export_op = &jfs_export_operations;
434
7fab479b DK	435	/*
	436	* Initialize direct-mapping inode/address-space
	437	*/
	438	inode = new_inode(sb);
	439	if (inode == NULL)
	440	goto out_kfree;
	441	inode->i_ino = 0;
	442	inode->i_nlink = 1;
	443	inode->i_size = sb->s_bdev->bd_inode->i_size;
	444	inode->i_mapping->a_ops = &jfs_metapage_aops;
ac17b8b5	445	insert_inode_hash(inode);
7fab479b DK	446	mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
	447
	448	sbi->direct_inode = inode;
	449
1da177e4 LT	450	rc = jfs_mount(sb);
	451	if (rc) {
	452	if (!silent) {
	453	jfs_err("jfs_mount failed w/return code = %d", rc);
	454	}
7fab479b	455	goto out_mount_failed;
1da177e4 LT	456	}
	457	if (sb->s_flags & MS_RDONLY)
	458	sbi->log = NULL;
	459	else {
	460	rc = jfs_mount_rw(sb, 0);
	461	if (rc) {
	462	if (!silent) {
	463	jfs_err("jfs_mount_rw failed, return code = %d",
	464	rc);
	465	}
	466	goto out_no_rw;
	467	}
	468	}
	469
	470	sb->s_magic = JFS_SUPER_MAGIC;
	471
	472	inode = iget(sb, ROOT_I);
	473	if (!inode \|\| is_bad_inode(inode))
	474	goto out_no_root;
	475	sb->s_root = d_alloc_root(inode);
	476	if (!sb->s_root)
	477	goto out_no_root;
	478
	479	if (sbi->mntflag & JFS_OS2)
	480	sb->s_root->d_op = &jfs_ci_dentry_operations;
	481
	482	/* logical blocks are represented by 40 bits in pxd_t, etc. */
	483	sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
	484	#if BITS_PER_LONG == 32
	485	/*
	486	* Page cache is indexed by long.
	487	* I would use MAX_LFS_FILESIZE, but it's only half as big
	488	*/
	489	sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
	490	#endif
	491	sb->s_time_gran = 1;
	492	return 0;
	493
	494	out_no_root:
	495	jfs_err("jfs_read_super: get root inode failed");
	496	if (inode)
	497	iput(inode);
	498
	499	out_no_rw:
	500	rc = jfs_umount(sb);
	501	if (rc) {
	502	jfs_err("jfs_umount failed with return code %d", rc);
	503	}
7fab479b	504	out_mount_failed:
28fd1298	505	filemap_write_and_wait(sbi->direct_inode->i_mapping);
7fab479b DK	506	truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
	507	make_bad_inode(sbi->direct_inode);
	508	iput(sbi->direct_inode);
	509	sbi->direct_inode = NULL;
1da177e4 LT	510	out_kfree:
	511	if (sbi->nls_tab)
	512	unload_nls(sbi->nls_tab);
	513	kfree(sbi);
	514	return -EINVAL;
	515	}
	516
	517	static void jfs_write_super_lockfs(struct super_block *sb)
	518	{
	519	struct jfs_sb_info *sbi = JFS_SBI(sb);
	520	struct jfs_log *log = sbi->log;
	521
	522	if (!(sb->s_flags & MS_RDONLY)) {
	523	txQuiesce(sb);
	524	lmLogShutdown(log);
	525	updateSuper(sb, FM_CLEAN);
	526	}
	527	}
	528
	529	static void jfs_unlockfs(struct super_block *sb)
	530	{
	531	struct jfs_sb_info *sbi = JFS_SBI(sb);
	532	struct jfs_log *log = sbi->log;
	533	int rc = 0;
	534
	535	if (!(sb->s_flags & MS_RDONLY)) {
	536	updateSuper(sb, FM_MOUNT);
	537	if ((rc = lmLogInit(log)))
	538	jfs_err("jfs_unlock failed with return code %d", rc);
	539	else
	540	txResume(sb);
	541	}
	542	}
	543
	544	static struct super_block jfs_get_sb(struct file_system_type fs_type,
	545	int flags, const char dev_name, void data)
	546	{
	547	return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
	548	}
	549
	550	static int jfs_sync_fs(struct super_block *sb, int wait)
	551	{
	552	struct jfs_log *log = JFS_SBI(sb)->log;
	553
	554	/* log == NULL indicates read-only mount */
1c627829	555	if (log) {
1da177e4	556	jfs_flush_journal(log, wait);
cbc3d65e	557	jfs_syncpt(log, 0);
1c627829	558	}
1da177e4 LT	559
	560	return 0;
	561	}
	562
8fc2751b MB	563	static int jfs_show_options(struct seq_file seq, struct vfsmount vfs)
	564	{
	565	struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
	566
	567	if (sbi->flag & JFS_NOINTEGRITY)
	568	seq_puts(seq, ",nointegrity");
	569	else
	570	seq_puts(seq, ",integrity");
	571
	572	#if defined(CONFIG_QUOTA)
	573	if (sbi->flag & JFS_USRQUOTA)
	574	seq_puts(seq, ",usrquota");
	575
	576	if (sbi->flag & JFS_GRPQUOTA)
	577	seq_puts(seq, ",grpquota");
	578	#endif
	579
	580	return 0;
	581	}
	582
1da177e4 LT	583	static struct super_operations jfs_super_operations = {
	584	.alloc_inode = jfs_alloc_inode,
	585	.destroy_inode = jfs_destroy_inode,
	586	.read_inode = jfs_read_inode,
	587	.dirty_inode = jfs_dirty_inode,
	588	.write_inode = jfs_write_inode,
	589	.delete_inode = jfs_delete_inode,
	590	.put_super = jfs_put_super,
	591	.sync_fs = jfs_sync_fs,
	592	.write_super_lockfs = jfs_write_super_lockfs,
	593	.unlockfs = jfs_unlockfs,
	594	.statfs = jfs_statfs,
	595	.remount_fs = jfs_remount,
8fc2751b	596	.show_options = jfs_show_options
1da177e4 LT	597	};
	598
	599	static struct export_operations jfs_export_operations = {
	600	.get_parent = jfs_get_parent,
	601	};
	602
	603	static struct file_system_type jfs_fs_type = {
	604	.owner = THIS_MODULE,
	605	.name = "jfs",
	606	.get_sb = jfs_get_sb,
	607	.kill_sb = kill_block_super,
	608	.fs_flags = FS_REQUIRES_DEV,
	609	};
	610
1da177e4 LT	611	static void init_once(void foo, kmem_cache_t cachep, unsigned long flags)
	612	{
	613	struct jfs_inode_info jfs_ip = (struct jfs_inode_info ) foo;
	614
	615	if ((flags & (SLAB_CTOR_VERIFY \| SLAB_CTOR_CONSTRUCTOR)) ==
	616	SLAB_CTOR_CONSTRUCTOR) {
	617	memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
	618	INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
	619	init_rwsem(&jfs_ip->rdwrlock);
	620	init_MUTEX(&jfs_ip->commit_sem);
	621	init_rwsem(&jfs_ip->xattr_sem);
	622	spin_lock_init(&jfs_ip->ag_lock);
	623	jfs_ip->active_ag = -1;
	624	#ifdef CONFIG_JFS_POSIX_ACL
	625	jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
	626	jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
	627	#endif
	628	inode_init_once(&jfs_ip->vfs_inode);
	629	}
	630	}
	631
	632	static int __init init_jfs_fs(void)
	633	{
	634	int i;
	635	int rc;
	636
	637	jfs_inode_cachep =
	638	kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
	639	SLAB_RECLAIM_ACCOUNT, init_once, NULL);
	640	if (jfs_inode_cachep == NULL)
	641	return -ENOMEM;
	642
	643	/*
	644	* Metapage initialization
	645	*/
	646	rc = metapage_init();
	647	if (rc) {
	648	jfs_err("metapage_init failed w/rc = %d", rc);
	649	goto free_slab;
	650	}
	651
	652	/*
	653	* Transaction Manager initialization
	654	*/
	655	rc = txInit();
	656	if (rc) {
	657	jfs_err("txInit failed w/rc = %d", rc);
	658	goto free_metapage;
	659	}
	660
	661	/*
	662	* I/O completion thread (endio)
	663	*/
	664	jfsIOthread = kernel_thread(jfsIOWait, NULL, CLONE_KERNEL);
	665	if (jfsIOthread < 0) {
	666	jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
	667	goto end_txmngr;
	668	}
	669	wait_for_completion(&jfsIOwait); /* Wait until thread starts */
	670
	671	if (commit_threads < 1)
	672	commit_threads = num_online_cpus();
	673	if (commit_threads > MAX_COMMIT_THREADS)
	674	commit_threads = MAX_COMMIT_THREADS;
675
676	for (i = 0; i < commit_threads; i++) {
677	jfsCommitThread[i] = kernel_thread(jfs_lazycommit, NULL,
678	CLONE_KERNEL);
679	if (jfsCommitThread[i] < 0) {
680	jfs_err("init_jfs_fs: fork failed w/rc = %d",
681	jfsCommitThread[i]);
682	commit_threads = i;
683	goto kill_committask;
684	}
685	/* Wait until thread starts */
686	wait_for_completion(&jfsIOwait);
687	}
688
689	jfsSyncThread = kernel_thread(jfs_sync, NULL, CLONE_KERNEL);
690	if (jfsSyncThread < 0) {
691	jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
692	goto kill_committask;
693	}
694	wait_for_completion(&jfsIOwait); /* Wait until thread starts */
695
696	#ifdef PROC_FS_JFS
697	jfs_proc_init();
698	#endif
699
700	return register_filesystem(&jfs_fs_type);
701
702	kill_committask:
703	jfs_stop_threads = 1;
704	wake_up_all(&jfs_commit_thread_wait);
705	for (i = 0; i < commit_threads; i++)
706	wait_for_completion(&jfsIOwait);
707
708	wake_up(&jfs_IO_thread_wait);
709	wait_for_completion(&jfsIOwait); /* Wait for thread exit */
710	end_txmngr:
711	txExit();
712	free_metapage:
713	metapage_exit();
714	free_slab:
715	kmem_cache_destroy(jfs_inode_cachep);
716	return rc;
717	}
718
719	static void __exit exit_jfs_fs(void)
720	{
721	int i;
722
723	jfs_info("exit_jfs_fs called");
724
725	jfs_stop_threads = 1;
726	txExit();
727	metapage_exit();
728	wake_up(&jfs_IO_thread_wait);
729	wait_for_completion(&jfsIOwait); /* Wait until IO thread exits */
730	wake_up_all(&jfs_commit_thread_wait);
731	for (i = 0; i < commit_threads; i++)
732	wait_for_completion(&jfsIOwait);
733	wake_up(&jfs_sync_thread_wait);
734	wait_for_completion(&jfsIOwait); /* Wait until Sync thread exits */
735	#ifdef PROC_FS_JFS
736	jfs_proc_clean();
737	#endif
738	unregister_filesystem(&jfs_fs_type);
739	kmem_cache_destroy(jfs_inode_cachep);
740	}
741
742	module_init(init_jfs_fs)
743	module_exit(exit_jfs_fs)