[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/kthread.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");

static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
struct task_struct *jfsIOthread;
struct task_struct *jfsSyncThread;

#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, Opt_uid, Opt_gid, Opt_umask
};

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_uid, "uid=%u"},
	{Opt_gid, "gid=%u"},
	{Opt_umask, "umask=%u"},
	{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
		case Opt_uid:
		{
			char *uid = args[0].from;
			sbi->uid = simple_strtoul(uid, &uid, 0);
			break;
		}
		case Opt_gid:
		{
			char *gid = args[0].from;
			sbi->gid = simple_strtoul(gid, &gid, 0);
			break;
		}
		case Opt_umask:
		{
			char *umask = args[0].from;
			sbi->umask = simple_strtoul(umask, &umask, 8);
			if (sbi->umask & ~0777) {
				printk(KERN_ERR
				       "JFS: Invalid value of umask\n");
				goto cleanup;
			}
			break;
		}
		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 = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
	if (!sbi)
		return -ENOSPC;
	sb->s_fs_info = sbi;
	sbi->sb = sb;
	sbi->uid = sbi->gid = sbi->umask = -1;

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

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->uid != -1)
		seq_printf(seq, ",uid=%d", sbi->uid);
	if (sbi->gid != -1)
		seq_printf(seq, ",gid=%d", sbi->gid);
	if (sbi->umask != -1)
		seq_printf(seq, ",umask=%03o", sbi->umask);
	if (sbi->flag & JFS_NOINTEGRITY)
		seq_puts(seq, ",nointegrity");

#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);
		mutex_init(&jfs_ip->commit_mutex);
		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|SLAB_MEM_SPREAD,
			    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 = kthread_run(jfsIOWait, NULL, "jfsIO");
	if (IS_ERR(jfsIOthread)) {
		rc = PTR_ERR(jfsIOthread);
		jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
		goto end_txmngr;
	}

	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] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
		if (IS_ERR(jfsCommitThread[i])) {
			rc = PTR_ERR(jfsCommitThread[i]);
			jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
			commit_threads = i;
			goto kill_committask;
		}
	}

	jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
	if (IS_ERR(jfsSyncThread)) {
		rc = PTR_ERR(jfsSyncThread);
		jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
		goto kill_committask;
	}

#ifdef PROC_FS_JFS
	jfs_proc_init();
#endif

	return register_filesystem(&jfs_fs_type);

kill_committask:
	for (i = 0; i < commit_threads; i++)
		kthread_stop(jfsCommitThread[i]);
	kthread_stop(jfsIOthread);
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");

	txExit();
	metapage_exit();

	kthread_stop(jfsIOthread);
	for (i = 0; i < commit_threads; i++)
		kthread_stop(jfsCommitThread[i]);
	kthread_stop(jfsSyncThread);
#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>
91dbb4de	28	#include <linux/kthread.h>
9a59f452	29	#include <linux/posix_acl.h>
1da177e4	30	#include <asm/uaccess.h>
8fc2751b	31	#include <linux/seq_file.h>
1da177e4 LT	32
	33	#include "jfs_incore.h"
	34	#include "jfs_filsys.h"
1868f4aa	35	#include "jfs_inode.h"
1da177e4 LT	36	#include "jfs_metapage.h"
	37	#include "jfs_superblock.h"
	38	#include "jfs_dmap.h"
	39	#include "jfs_imap.h"
	40	#include "jfs_acl.h"
	41	#include "jfs_debug.h"
	42
	43	MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
	44	MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
	45	MODULE_LICENSE("GPL");
	46
	47	static kmem_cache_t * jfs_inode_cachep;
	48
	49	static struct super_operations jfs_super_operations;
	50	static struct export_operations jfs_export_operations;
	51	static struct file_system_type jfs_fs_type;
	52
	53	#define MAX_COMMIT_THREADS 64
	54	static int commit_threads = 0;
	55	module_param(commit_threads, int, 0);
	56	MODULE_PARM_DESC(commit_threads, "Number of commit threads");
	57
91dbb4de CH	58	static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
	59	struct task_struct *jfsIOthread;
	60	struct task_struct *jfsSyncThread;
1da177e4 LT	61
	62	#ifdef CONFIG_JFS_DEBUG
	63	int jfsloglevel = JFS_LOGLEVEL_WARN;
	64	module_param(jfsloglevel, int, 0644);
	65	MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
	66	#endif
	67
1da177e4 LT	68	static void jfs_handle_error(struct super_block *sb)
	69	{
	70	struct jfs_sb_info *sbi = JFS_SBI(sb);
	71
	72	if (sb->s_flags & MS_RDONLY)
	73	return;
	74
	75	updateSuper(sb, FM_DIRTY);
	76
	77	if (sbi->flag & JFS_ERR_PANIC)
	78	panic("JFS (device %s): panic forced after error\n",
	79	sb->s_id);
	80	else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
	81	jfs_err("ERROR: (device %s): remounting filesystem "
	82	"as read-only\n",
	83	sb->s_id);
	84	sb->s_flags \|= MS_RDONLY;
	85	}
	86
	87	/* nothing is done for continue beyond marking the superblock dirty */
	88	}
	89
	90	void jfs_error(struct super_block sb, const char function, ...)
	91	{
	92	static char error_buf[256];
	93	va_list args;
	94
	95	va_start(args, function);
	96	vsprintf(error_buf, function, args);
	97	va_end(args);
	98
	99	printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
	100
	101	jfs_handle_error(sb);
	102	}
	103
	104	static struct inode jfs_alloc_inode(struct super_block sb)
	105	{
	106	struct jfs_inode_info *jfs_inode;
	107
	108	jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
	109	if (!jfs_inode)
	110	return NULL;
	111	return &jfs_inode->vfs_inode;
	112	}
	113
	114	static void jfs_destroy_inode(struct inode *inode)
	115	{
	116	struct jfs_inode_info *ji = JFS_IP(inode);
	117
8a9cd6d6 DK	118	BUG_ON(!list_empty(&ji->anon_inode_list));
8a9cd6d6 DK	119
1da177e4 LT	120	spin_lock_irq(&ji->ag_lock);
	121	if (ji->active_ag != -1) {
	122	struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
	123	atomic_dec(&bmap->db_active[ji->active_ag]);
	124	ji->active_ag = -1;
	125	}
	126	spin_unlock_irq(&ji->ag_lock);
	127
	128	#ifdef CONFIG_JFS_POSIX_ACL
	129	if (ji->i_acl != JFS_ACL_NOT_CACHED) {
	130	posix_acl_release(ji->i_acl);
	131	ji->i_acl = JFS_ACL_NOT_CACHED;
	132	}
	133	if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
	134	posix_acl_release(ji->i_default_acl);
	135	ji->i_default_acl = JFS_ACL_NOT_CACHED;
	136	}
	137	#endif
	138
	139	kmem_cache_free(jfs_inode_cachep, ji);
	140	}
	141
	142	static int jfs_statfs(struct super_block sb, struct kstatfs buf)
	143	{
	144	struct jfs_sb_info *sbi = JFS_SBI(sb);
	145	s64 maxinodes;
	146	struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
	147
	148	jfs_info("In jfs_statfs");
	149	buf->f_type = JFS_SUPER_MAGIC;
	150	buf->f_bsize = sbi->bsize;
	151	buf->f_blocks = sbi->bmap->db_mapsize;
	152	buf->f_bfree = sbi->bmap->db_nfree;
	153	buf->f_bavail = sbi->bmap->db_nfree;
	154	/*
	155	* If we really return the number of allocated & free inodes, some
	156	* applications will fail because they won't see enough free inodes.
	157	* We'll try to calculate some guess as to how may inodes we can
	158	* really allocate
	159	*
	160	* buf->f_files = atomic_read(&imap->im_numinos);
	161	* buf->f_ffree = atomic_read(&imap->im_numfree);
	162	*/
	163	maxinodes = min((s64) atomic_read(&imap->im_numinos) +
	164	((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
	165	<< L2INOSPEREXT), (s64) 0xffffffffLL);
	166	buf->f_files = maxinodes;
	167	buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
	168	atomic_read(&imap->im_numfree));
	169
	170	buf->f_namelen = JFS_NAME_MAX;
	171	return 0;
	172	}
	173
	174	static void jfs_put_super(struct super_block *sb)
	175	{
	176	struct jfs_sb_info *sbi = JFS_SBI(sb);
	177	int rc;
	178
	179	jfs_info("In jfs_put_super");
	180	rc = jfs_umount(sb);
	181	if (rc)
	182	jfs_err("jfs_umount failed with return code %d", rc);
	183	if (sbi->nls_tab)
184	unload_nls(sbi->nls_tab);
185	sbi->nls_tab = NULL;
186
7fab479b DK	187	truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
	188	iput(sbi->direct_inode);
	189	sbi->direct_inode = NULL;
	190
1da177e4 LT	191	kfree(sbi);
	192	}
	193
	194	enum {
	195	Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
8fc2751b	196	Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
69eb66d7	197	Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
1da177e4 LT	198	};
	199
	200	static match_table_t tokens = {
	201	{Opt_integrity, "integrity"},
	202	{Opt_nointegrity, "nointegrity"},
	203	{Opt_iocharset, "iocharset=%s"},
	204	{Opt_resize, "resize=%u"},
	205	{Opt_resize_nosize, "resize"},
	206	{Opt_errors, "errors=%s"},
	207	{Opt_ignore, "noquota"},
	208	{Opt_ignore, "quota"},
8fc2751b MB	209	{Opt_usrquota, "usrquota"},
8fc2751b MB	210	{Opt_grpquota, "grpquota"},
69eb66d7 DK	211	{Opt_uid, "uid=%u"},
	212	{Opt_gid, "gid=%u"},
	213	{Opt_umask, "umask=%u"},
1da177e4 LT	214	{Opt_err, NULL}
	215	};
	216
	217	static int parse_options(char options, struct super_block sb, s64 *newLVSize,
	218	int *flag)
	219	{
	220	void nls_map = (void )-1; /* -1: no change; NULL: none */
	221	char *p;
	222	struct jfs_sb_info *sbi = JFS_SBI(sb);
	223
	224	*newLVSize = 0;
	225
	226	if (!options)
	227	return 1;
	228
	229	while ((p = strsep(&options, ",")) != NULL) {
	230	substring_t args[MAX_OPT_ARGS];
	231	int token;
	232	if (!*p)
	233	continue;
	234
	235	token = match_token(p, tokens, args);
	236	switch (token) {
	237	case Opt_integrity:
	238	*flag &= ~JFS_NOINTEGRITY;
	239	break;
	240	case Opt_nointegrity:
	241	*flag \|= JFS_NOINTEGRITY;
	242	break;
	243	case Opt_ignore:
	244	/* Silently ignore the quota options */
	245	/* Don't do anything ;-) */
	246	break;
	247	case Opt_iocharset:
	248	if (nls_map && nls_map != (void *) -1)
	249	unload_nls(nls_map);
	250	if (!strcmp(args[0].from, "none"))
	251	nls_map = NULL;
	252	else {
	253	nls_map = load_nls(args[0].from);
	254	if (!nls_map) {
	255	printk(KERN_ERR
	256	"JFS: charset not found\n");
	257	goto cleanup;
	258	}
	259	}
	260	break;
	261	case Opt_resize:
	262	{
	263	char *resize = args[0].from;
	264	*newLVSize = simple_strtoull(resize, &resize, 0);
	265	break;
	266	}
	267	case Opt_resize_nosize:
	268	{
	269	*newLVSize = sb->s_bdev->bd_inode->i_size >>
	270	sb->s_blocksize_bits;
	271	if (*newLVSize == 0)
	272	printk(KERN_ERR
	273	"JFS: Cannot determine volume size\n");
	274	break;
	275	}
	276	case Opt_errors:
	277	{
278	char *errors = args[0].from;
279	if (!errors \|\| !*errors)
280	goto cleanup;
281	if (!strcmp(errors, "continue")) {
282	*flag &= ~JFS_ERR_REMOUNT_RO;
283	*flag &= ~JFS_ERR_PANIC;
284	*flag \|= JFS_ERR_CONTINUE;
285	} else if (!strcmp(errors, "remount-ro")) {
286	*flag &= ~JFS_ERR_CONTINUE;
287	*flag &= ~JFS_ERR_PANIC;
288	*flag \|= JFS_ERR_REMOUNT_RO;
289	} else if (!strcmp(errors, "panic")) {
290	*flag &= ~JFS_ERR_CONTINUE;
291	*flag &= ~JFS_ERR_REMOUNT_RO;
292	*flag \|= JFS_ERR_PANIC;
293	} else {
294	printk(KERN_ERR
295	"JFS: %s is an invalid error handler\n",
296	errors);
297	goto cleanup;
298	}
299	break;
300	}
8fc2751b MB	301
	302	#if defined(CONFIG_QUOTA)
	303	case Opt_quota:
	304	case Opt_usrquota:
	305	*flag \|= JFS_USRQUOTA;
	306	break;
	307	case Opt_grpquota:
	308	*flag \|= JFS_GRPQUOTA;
	309	break;
	310	#else
	311	case Opt_usrquota:
	312	case Opt_grpquota:
	313	case Opt_quota:
	314	printk(KERN_ERR
	315	"JFS: quota operations not supported\n");
	316	break;
	317	#endif
69eb66d7 DK	318	case Opt_uid:
	319	{
	320	char *uid = args[0].from;
	321	sbi->uid = simple_strtoul(uid, &uid, 0);
	322	break;
	323	}
	324	case Opt_gid:
	325	{
	326	char *gid = args[0].from;
	327	sbi->gid = simple_strtoul(gid, &gid, 0);
	328	break;
	329	}
	330	case Opt_umask:
	331	{
	332	char *umask = args[0].from;
	333	sbi->umask = simple_strtoul(umask, &umask, 8);
	334	if (sbi->umask & ~0777) {
	335	printk(KERN_ERR
	336	"JFS: Invalid value of umask\n");
	337	goto cleanup;
	338	}
	339	break;
	340	}
1da177e4 LT	341	default:
	342	printk("jfs: Unrecognized mount option \"%s\" "
	343	" or missing value\n", p);
	344	goto cleanup;
	345	}
	346	}
	347
	348	if (nls_map != (void *) -1) {
	349	/* Discard old (if remount) */
	350	if (sbi->nls_tab)
	351	unload_nls(sbi->nls_tab);
	352	sbi->nls_tab = nls_map;
	353	}
	354	return 1;
	355
	356	cleanup:
	357	if (nls_map && nls_map != (void *) -1)
	358	unload_nls(nls_map);
	359	return 0;
	360	}
	361
	362	static int jfs_remount(struct super_block sb, int flags, char *data)
	363	{
	364	s64 newLVSize = 0;
	365	int rc = 0;
	366	int flag = JFS_SBI(sb)->flag;
	367
	368	if (!parse_options(data, sb, &newLVSize, &flag)) {
	369	return -EINVAL;
	370	}
	371	if (newLVSize) {
	372	if (sb->s_flags & MS_RDONLY) {
	373	printk(KERN_ERR
	374	"JFS: resize requires volume to be mounted read-write\n");
	375	return -EROFS;
	376	}
	377	rc = jfs_extendfs(sb, newLVSize, 0);
	378	if (rc)
	379	return rc;
	380	}
	381
	382	if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
7fab479b DK	383	/*
	384	* Invalidate any previously read metadata. fsck may have
	385	* changed the on-disk data since we mounted r/o
	386	*/
	387	truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
	388
1da177e4 LT	389	JFS_SBI(sb)->flag = flag;
	390	return jfs_mount_rw(sb, 1);
	391	}
	392	if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
	393	rc = jfs_umount_rw(sb);
	394	JFS_SBI(sb)->flag = flag;
	395	return rc;
	396	}
	397	if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
	398	if (!(sb->s_flags & MS_RDONLY)) {
	399	rc = jfs_umount_rw(sb);
	400	if (rc)
	401	return rc;
	402	JFS_SBI(sb)->flag = flag;
	403	return jfs_mount_rw(sb, 1);
	404	}
	405	JFS_SBI(sb)->flag = flag;
	406
	407	return 0;
	408	}
	409
	410	static int jfs_fill_super(struct super_block sb, void data, int silent)
	411	{
	412	struct jfs_sb_info *sbi;
	413	struct inode *inode;
	414	int rc;
	415	s64 newLVSize = 0;
	416	int flag;
	417
	418	jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
	419
	420	if (!new_valid_dev(sb->s_bdev->bd_dev))
	421	return -EOVERFLOW;
	422
5b3030e3	423	sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
1da177e4 LT	424	if (!sbi)
1da177e4 LT	425	return -ENOSPC;
1da177e4 LT	426	sb->s_fs_info = sbi;
1da177e4 LT	427	sbi->sb = sb;
69eb66d7	428	sbi->uid = sbi->gid = sbi->umask = -1;
1da177e4 LT	429
	430	/* initialize the mount flag and determine the default error handler */
	431	flag = JFS_ERR_REMOUNT_RO;
	432
	433	if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
	434	kfree(sbi);
	435	return -EINVAL;
	436	}
	437	sbi->flag = flag;
	438
	439	#ifdef CONFIG_JFS_POSIX_ACL
	440	sb->s_flags \|= MS_POSIXACL;
	441	#endif
	442
	443	if (newLVSize) {
	444	printk(KERN_ERR "resize option for remount only\n");
	445	return -EINVAL;
	446	}
	447
	448	/*
	449	* Initialize blocksize to 4K.
	450	*/
	451	sb_set_blocksize(sb, PSIZE);
	452
	453	/*
	454	* Set method vectors.
	455	*/
	456	sb->s_op = &jfs_super_operations;
	457	sb->s_export_op = &jfs_export_operations;
	458
7fab479b DK	459	/*
	460	* Initialize direct-mapping inode/address-space
	461	*/
	462	inode = new_inode(sb);
	463	if (inode == NULL)
	464	goto out_kfree;
	465	inode->i_ino = 0;
	466	inode->i_nlink = 1;
	467	inode->i_size = sb->s_bdev->bd_inode->i_size;
	468	inode->i_mapping->a_ops = &jfs_metapage_aops;
ac17b8b5	469	insert_inode_hash(inode);
7fab479b DK	470	mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
	471
	472	sbi->direct_inode = inode;
	473
1da177e4 LT	474	rc = jfs_mount(sb);
	475	if (rc) {
	476	if (!silent) {
	477	jfs_err("jfs_mount failed w/return code = %d", rc);
	478	}
7fab479b	479	goto out_mount_failed;
1da177e4 LT	480	}
	481	if (sb->s_flags & MS_RDONLY)
	482	sbi->log = NULL;
	483	else {
	484	rc = jfs_mount_rw(sb, 0);
	485	if (rc) {
	486	if (!silent) {
	487	jfs_err("jfs_mount_rw failed, return code = %d",
	488	rc);
	489	}
	490	goto out_no_rw;
	491	}
	492	}
	493
	494	sb->s_magic = JFS_SUPER_MAGIC;
	495
	496	inode = iget(sb, ROOT_I);
	497	if (!inode \|\| is_bad_inode(inode))
	498	goto out_no_root;
	499	sb->s_root = d_alloc_root(inode);
	500	if (!sb->s_root)
	501	goto out_no_root;
	502
	503	if (sbi->mntflag & JFS_OS2)
	504	sb->s_root->d_op = &jfs_ci_dentry_operations;
	505
	506	/* logical blocks are represented by 40 bits in pxd_t, etc. */
	507	sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
	508	#if BITS_PER_LONG == 32
	509	/*
	510	* Page cache is indexed by long.
	511	* I would use MAX_LFS_FILESIZE, but it's only half as big
	512	*/
	513	sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
	514	#endif
	515	sb->s_time_gran = 1;
	516	return 0;
	517
	518	out_no_root:
	519	jfs_err("jfs_read_super: get root inode failed");
	520	if (inode)
	521	iput(inode);
	522
	523	out_no_rw:
	524	rc = jfs_umount(sb);
	525	if (rc) {
	526	jfs_err("jfs_umount failed with return code %d", rc);
	527	}
7fab479b	528	out_mount_failed:
28fd1298	529	filemap_write_and_wait(sbi->direct_inode->i_mapping);
7fab479b DK	530	truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
	531	make_bad_inode(sbi->direct_inode);
	532	iput(sbi->direct_inode);
	533	sbi->direct_inode = NULL;
1da177e4 LT	534	out_kfree:
	535	if (sbi->nls_tab)
	536	unload_nls(sbi->nls_tab);
	537	kfree(sbi);
	538	return -EINVAL;
	539	}
	540
	541	static void jfs_write_super_lockfs(struct super_block *sb)
	542	{
	543	struct jfs_sb_info *sbi = JFS_SBI(sb);
	544	struct jfs_log *log = sbi->log;
	545
	546	if (!(sb->s_flags & MS_RDONLY)) {
	547	txQuiesce(sb);
	548	lmLogShutdown(log);
	549	updateSuper(sb, FM_CLEAN);
	550	}
	551	}
	552
	553	static void jfs_unlockfs(struct super_block *sb)
	554	{
	555	struct jfs_sb_info *sbi = JFS_SBI(sb);
	556	struct jfs_log *log = sbi->log;
	557	int rc = 0;
	558
	559	if (!(sb->s_flags & MS_RDONLY)) {
	560	updateSuper(sb, FM_MOUNT);
	561	if ((rc = lmLogInit(log)))
	562	jfs_err("jfs_unlock failed with return code %d", rc);
	563	else
	564	txResume(sb);
	565	}
	566	}
	567
454e2398 DH	568	static int jfs_get_sb(struct file_system_type *fs_type,
454e2398 DH	569	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	570	{
454e2398 DH	571	return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
454e2398 DH	572	mnt);
1da177e4 LT	573	}
	574
	575	static int jfs_sync_fs(struct super_block *sb, int wait)
	576	{
	577	struct jfs_log *log = JFS_SBI(sb)->log;
	578
	579	/* log == NULL indicates read-only mount */
1c627829	580	if (log) {
1da177e4	581	jfs_flush_journal(log, wait);
cbc3d65e	582	jfs_syncpt(log, 0);
1c627829	583	}
1da177e4 LT	584
	585	return 0;
	586	}
	587
8fc2751b MB	588	static int jfs_show_options(struct seq_file seq, struct vfsmount vfs)
	589	{
	590	struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
	591
69eb66d7 DK	592	if (sbi->uid != -1)
	593	seq_printf(seq, ",uid=%d", sbi->uid);
	594	if (sbi->gid != -1)
	595	seq_printf(seq, ",gid=%d", sbi->gid);
	596	if (sbi->umask != -1)
	597	seq_printf(seq, ",umask=%03o", sbi->umask);
8fc2751b MB	598	if (sbi->flag & JFS_NOINTEGRITY)
8fc2751b MB	599	seq_puts(seq, ",nointegrity");
8fc2751b MB	600
	601	#if defined(CONFIG_QUOTA)
	602	if (sbi->flag & JFS_USRQUOTA)
	603	seq_puts(seq, ",usrquota");
	604
	605	if (sbi->flag & JFS_GRPQUOTA)
	606	seq_puts(seq, ",grpquota");
	607	#endif
	608
	609	return 0;
	610	}
	611
1da177e4 LT	612	static struct super_operations jfs_super_operations = {
	613	.alloc_inode = jfs_alloc_inode,
	614	.destroy_inode = jfs_destroy_inode,
	615	.read_inode = jfs_read_inode,
	616	.dirty_inode = jfs_dirty_inode,
	617	.write_inode = jfs_write_inode,
	618	.delete_inode = jfs_delete_inode,
	619	.put_super = jfs_put_super,
	620	.sync_fs = jfs_sync_fs,
	621	.write_super_lockfs = jfs_write_super_lockfs,
	622	.unlockfs = jfs_unlockfs,
	623	.statfs = jfs_statfs,
	624	.remount_fs = jfs_remount,
8fc2751b	625	.show_options = jfs_show_options
1da177e4 LT	626	};
	627
	628	static struct export_operations jfs_export_operations = {
	629	.get_parent = jfs_get_parent,
	630	};
	631
	632	static struct file_system_type jfs_fs_type = {
	633	.owner = THIS_MODULE,
	634	.name = "jfs",
	635	.get_sb = jfs_get_sb,
	636	.kill_sb = kill_block_super,
	637	.fs_flags = FS_REQUIRES_DEV,
	638	};
	639
1da177e4 LT	640	static void init_once(void foo, kmem_cache_t cachep, unsigned long flags)
	641	{
	642	struct jfs_inode_info jfs_ip = (struct jfs_inode_info ) foo;
	643
	644	if ((flags & (SLAB_CTOR_VERIFY \| SLAB_CTOR_CONSTRUCTOR)) ==
	645	SLAB_CTOR_CONSTRUCTOR) {
	646	memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
	647	INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
	648	init_rwsem(&jfs_ip->rdwrlock);
1de87444	649	mutex_init(&jfs_ip->commit_mutex);
1da177e4 LT	650	init_rwsem(&jfs_ip->xattr_sem);
	651	spin_lock_init(&jfs_ip->ag_lock);
	652	jfs_ip->active_ag = -1;
	653	#ifdef CONFIG_JFS_POSIX_ACL
	654	jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
	655	jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
	656	#endif
	657	inode_init_once(&jfs_ip->vfs_inode);
	658	}
	659	}
	660
	661	static int __init init_jfs_fs(void)
	662	{
	663	int i;
	664	int rc;
	665
	666	jfs_inode_cachep =
	667	kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
fffb60f9 PJ	668	SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD,
fffb60f9 PJ	669	init_once, NULL);
1da177e4 LT	670	if (jfs_inode_cachep == NULL)
	671	return -ENOMEM;
	672
	673	/*
	674	* Metapage initialization
	675	*/
	676	rc = metapage_init();
	677	if (rc) {
	678	jfs_err("metapage_init failed w/rc = %d", rc);
	679	goto free_slab;
	680	}
	681
	682	/*
	683	* Transaction Manager initialization
	684	*/
	685	rc = txInit();
	686	if (rc) {
	687	jfs_err("txInit failed w/rc = %d", rc);
	688	goto free_metapage;
	689	}
	690
	691	/*
	692	* I/O completion thread (endio)
	693	*/
91dbb4de CH	694	jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
	695	if (IS_ERR(jfsIOthread)) {
	696	rc = PTR_ERR(jfsIOthread);
	697	jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1da177e4 LT	698	goto end_txmngr;
1da177e4 LT	699	}
1da177e4 LT	700
	701	if (commit_threads < 1)
	702	commit_threads = num_online_cpus();
	703	if (commit_threads > MAX_COMMIT_THREADS)
	704	commit_threads = MAX_COMMIT_THREADS;
	705
	706	for (i = 0; i < commit_threads; i++) {
91dbb4de CH	707	jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
	708	if (IS_ERR(jfsCommitThread[i])) {
	709	rc = PTR_ERR(jfsCommitThread[i]);
	710	jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1da177e4 LT	711	commit_threads = i;
	712	goto kill_committask;
	713	}
1da177e4 LT	714	}
1da177e4 LT	715
91dbb4de CH	716	jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
	717	if (IS_ERR(jfsSyncThread)) {
	718	rc = PTR_ERR(jfsSyncThread);
	719	jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1da177e4 LT	720	goto kill_committask;
1da177e4 LT	721	}
1da177e4 LT	722
	723	#ifdef PROC_FS_JFS
	724	jfs_proc_init();
	725	#endif
	726
	727	return register_filesystem(&jfs_fs_type);
	728
	729	kill_committask:
1da177e4	730	for (i = 0; i < commit_threads; i++)
91dbb4de CH	731	kthread_stop(jfsCommitThread[i]);
91dbb4de CH	732	kthread_stop(jfsIOthread);
1da177e4 LT	733	end_txmngr:
	734	txExit();
	735	free_metapage:
	736	metapage_exit();
	737	free_slab:
	738	kmem_cache_destroy(jfs_inode_cachep);
	739	return rc;
	740	}
	741
	742	static void __exit exit_jfs_fs(void)
	743	{
	744	int i;
	745
	746	jfs_info("exit_jfs_fs called");
	747
1da177e4 LT	748	txExit();
1da177e4 LT	749	metapage_exit();
91dbb4de CH	750
91dbb4de CH	751	kthread_stop(jfsIOthread);
1da177e4	752	for (i = 0; i < commit_threads; i++)
91dbb4de CH	753	kthread_stop(jfsCommitThread[i]);
91dbb4de CH	754	kthread_stop(jfsSyncThread);
1da177e4 LT	755	#ifdef PROC_FS_JFS
	756	jfs_proc_clean();
	757	#endif
	758	unregister_filesystem(&jfs_fs_type);
	759	kmem_cache_destroy(jfs_inode_cachep);
	760	}
	761
	762	module_init(init_jfs_fs)
	763	module_exit(exit_jfs_fs)