[deliverable/linux.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/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 dentry *dentry, struct kstatfs *buf)
{
	struct jfs_sb_info *sbi = JFS_SBI(dentry->d_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>
1da177e4 LT	21	#include <linux/module.h>
	22	#include <linux/parser.h>
	23	#include <linux/completion.h>
	24	#include <linux/vfs.h>
8fc2751b	25	#include <linux/mount.h>
1da177e4	26	#include <linux/moduleparam.h>
91dbb4de	27	#include <linux/kthread.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
91dbb4de CH	57	static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
	58	struct task_struct *jfsIOthread;
	59	struct task_struct *jfsSyncThread;
1da177e4 LT	60
	61	#ifdef CONFIG_JFS_DEBUG
	62	int jfsloglevel = JFS_LOGLEVEL_WARN;
	63	module_param(jfsloglevel, int, 0644);
	64	MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
	65	#endif
	66
1da177e4 LT	67	static void jfs_handle_error(struct super_block *sb)
	68	{
	69	struct jfs_sb_info *sbi = JFS_SBI(sb);
	70
	71	if (sb->s_flags & MS_RDONLY)
	72	return;
	73
	74	updateSuper(sb, FM_DIRTY);
	75
	76	if (sbi->flag & JFS_ERR_PANIC)
	77	panic("JFS (device %s): panic forced after error\n",
	78	sb->s_id);
	79	else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
	80	jfs_err("ERROR: (device %s): remounting filesystem "
	81	"as read-only\n",
	82	sb->s_id);
	83	sb->s_flags \|= MS_RDONLY;
	84	}
	85
	86	/* nothing is done for continue beyond marking the superblock dirty */
	87	}
	88
	89	void jfs_error(struct super_block sb, const char function, ...)
	90	{
	91	static char error_buf[256];
	92	va_list args;
	93
	94	va_start(args, function);
	95	vsprintf(error_buf, function, args);
	96	va_end(args);
	97
	98	printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
	99
	100	jfs_handle_error(sb);
	101	}
	102
	103	static struct inode jfs_alloc_inode(struct super_block sb)
	104	{
	105	struct jfs_inode_info *jfs_inode;
	106
	107	jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
	108	if (!jfs_inode)
	109	return NULL;
	110	return &jfs_inode->vfs_inode;
	111	}
	112
	113	static void jfs_destroy_inode(struct inode *inode)
	114	{
	115	struct jfs_inode_info *ji = JFS_IP(inode);
	116
8a9cd6d6 DK	117	BUG_ON(!list_empty(&ji->anon_inode_list));
8a9cd6d6 DK	118
1da177e4 LT	119	spin_lock_irq(&ji->ag_lock);
	120	if (ji->active_ag != -1) {
	121	struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
	122	atomic_dec(&bmap->db_active[ji->active_ag]);
	123	ji->active_ag = -1;
	124	}
	125	spin_unlock_irq(&ji->ag_lock);
	126
	127	#ifdef CONFIG_JFS_POSIX_ACL
	128	if (ji->i_acl != JFS_ACL_NOT_CACHED) {
	129	posix_acl_release(ji->i_acl);
	130	ji->i_acl = JFS_ACL_NOT_CACHED;
	131	}
	132	if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
	133	posix_acl_release(ji->i_default_acl);
	134	ji->i_default_acl = JFS_ACL_NOT_CACHED;
	135	}
	136	#endif
	137
	138	kmem_cache_free(jfs_inode_cachep, ji);
	139	}
	140
726c3342	141	static int jfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	142	{
726c3342	143	struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
1da177e4 LT	144	s64 maxinodes;
	145	struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
	146
	147	jfs_info("In jfs_statfs");
	148	buf->f_type = JFS_SUPER_MAGIC;
	149	buf->f_bsize = sbi->bsize;
	150	buf->f_blocks = sbi->bmap->db_mapsize;
	151	buf->f_bfree = sbi->bmap->db_nfree;
	152	buf->f_bavail = sbi->bmap->db_nfree;
	153	/*
	154	* If we really return the number of allocated & free inodes, some
	155	* applications will fail because they won't see enough free inodes.
	156	* We'll try to calculate some guess as to how may inodes we can
	157	* really allocate
	158	*
	159	* buf->f_files = atomic_read(&imap->im_numinos);
	160	* buf->f_ffree = atomic_read(&imap->im_numfree);
	161	*/
	162	maxinodes = min((s64) atomic_read(&imap->im_numinos) +
	163	((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
	164	<< L2INOSPEREXT), (s64) 0xffffffffLL);
	165	buf->f_files = maxinodes;
	166	buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
	167	atomic_read(&imap->im_numfree));
	168
	169	buf->f_namelen = JFS_NAME_MAX;
	170	return 0;
	171	}
	172
	173	static void jfs_put_super(struct super_block *sb)
	174	{
	175	struct jfs_sb_info *sbi = JFS_SBI(sb);
	176	int rc;
	177
	178	jfs_info("In jfs_put_super");
	179	rc = jfs_umount(sb);
	180	if (rc)
	181	jfs_err("jfs_umount failed with return code %d", rc);
	182	if (sbi->nls_tab)
	183	unload_nls(sbi->nls_tab);
	184	sbi->nls_tab = NULL;
	185
7fab479b DK	186	truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
	187	iput(sbi->direct_inode);
	188	sbi->direct_inode = NULL;
	189
1da177e4 LT	190	kfree(sbi);
	191	}
	192
	193	enum {
	194	Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
8fc2751b	195	Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
69eb66d7	196	Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
1da177e4 LT	197	};
	198
	199	static match_table_t tokens = {
	200	{Opt_integrity, "integrity"},
	201	{Opt_nointegrity, "nointegrity"},
	202	{Opt_iocharset, "iocharset=%s"},
	203	{Opt_resize, "resize=%u"},
	204	{Opt_resize_nosize, "resize"},
	205	{Opt_errors, "errors=%s"},
	206	{Opt_ignore, "noquota"},
	207	{Opt_ignore, "quota"},
8fc2751b MB	208	{Opt_usrquota, "usrquota"},
8fc2751b MB	209	{Opt_grpquota, "grpquota"},
69eb66d7 DK	210	{Opt_uid, "uid=%u"},
	211	{Opt_gid, "gid=%u"},
	212	{Opt_umask, "umask=%u"},
1da177e4 LT	213	{Opt_err, NULL}
	214	};
	215
	216	static int parse_options(char options, struct super_block sb, s64 *newLVSize,
	217	int *flag)
	218	{
	219	void nls_map = (void )-1; /* -1: no change; NULL: none */
	220	char *p;
	221	struct jfs_sb_info *sbi = JFS_SBI(sb);
	222
	223	*newLVSize = 0;
	224
	225	if (!options)
	226	return 1;
	227
	228	while ((p = strsep(&options, ",")) != NULL) {
	229	substring_t args[MAX_OPT_ARGS];
	230	int token;
	231	if (!*p)
	232	continue;
	233
	234	token = match_token(p, tokens, args);
	235	switch (token) {
	236	case Opt_integrity:
	237	*flag &= ~JFS_NOINTEGRITY;
	238	break;
	239	case Opt_nointegrity:
	240	*flag \|= JFS_NOINTEGRITY;
	241	break;
	242	case Opt_ignore:
	243	/* Silently ignore the quota options */
	244	/* Don't do anything ;-) */
	245	break;
	246	case Opt_iocharset:
	247	if (nls_map && nls_map != (void *) -1)
	248	unload_nls(nls_map);
	249	if (!strcmp(args[0].from, "none"))
	250	nls_map = NULL;
	251	else {
	252	nls_map = load_nls(args[0].from);
	253	if (!nls_map) {
	254	printk(KERN_ERR
	255	"JFS: charset not found\n");
	256	goto cleanup;
	257	}
	258	}
	259	break;
	260	case Opt_resize:
	261	{
	262	char *resize = args[0].from;
	263	*newLVSize = simple_strtoull(resize, &resize, 0);
	264	break;
	265	}
	266	case Opt_resize_nosize:
	267	{
	268	*newLVSize = sb->s_bdev->bd_inode->i_size >>
	269	sb->s_blocksize_bits;
	270	if (*newLVSize == 0)
	271	printk(KERN_ERR
	272	"JFS: Cannot determine volume size\n");
	273	break;
	274	}
	275	case Opt_errors:
	276	{
277	char *errors = args[0].from;
278	if (!errors \|\| !*errors)
279	goto cleanup;
280	if (!strcmp(errors, "continue")) {
281	*flag &= ~JFS_ERR_REMOUNT_RO;
282	*flag &= ~JFS_ERR_PANIC;
283	*flag \|= JFS_ERR_CONTINUE;
284	} else if (!strcmp(errors, "remount-ro")) {
285	*flag &= ~JFS_ERR_CONTINUE;
286	*flag &= ~JFS_ERR_PANIC;
287	*flag \|= JFS_ERR_REMOUNT_RO;
288	} else if (!strcmp(errors, "panic")) {
289	*flag &= ~JFS_ERR_CONTINUE;
290	*flag &= ~JFS_ERR_REMOUNT_RO;
291	*flag \|= JFS_ERR_PANIC;
292	} else {
293	printk(KERN_ERR
294	"JFS: %s is an invalid error handler\n",
295	errors);
296	goto cleanup;
297	}
298	break;
299	}
8fc2751b MB	300
	301	#if defined(CONFIG_QUOTA)
	302	case Opt_quota:
	303	case Opt_usrquota:
	304	*flag \|= JFS_USRQUOTA;
	305	break;
	306	case Opt_grpquota:
	307	*flag \|= JFS_GRPQUOTA;
	308	break;
	309	#else
	310	case Opt_usrquota:
	311	case Opt_grpquota:
	312	case Opt_quota:
	313	printk(KERN_ERR
	314	"JFS: quota operations not supported\n");
	315	break;
	316	#endif
69eb66d7 DK	317	case Opt_uid:
	318	{
	319	char *uid = args[0].from;
	320	sbi->uid = simple_strtoul(uid, &uid, 0);
	321	break;
	322	}
	323	case Opt_gid:
	324	{
	325	char *gid = args[0].from;
	326	sbi->gid = simple_strtoul(gid, &gid, 0);
	327	break;
	328	}
	329	case Opt_umask:
	330	{
	331	char *umask = args[0].from;
	332	sbi->umask = simple_strtoul(umask, &umask, 8);
	333	if (sbi->umask & ~0777) {
	334	printk(KERN_ERR
	335	"JFS: Invalid value of umask\n");
	336	goto cleanup;
	337	}
	338	break;
	339	}
1da177e4 LT	340	default:
	341	printk("jfs: Unrecognized mount option \"%s\" "
	342	" or missing value\n", p);
	343	goto cleanup;
	344	}
	345	}
	346
	347	if (nls_map != (void *) -1) {
	348	/* Discard old (if remount) */
	349	if (sbi->nls_tab)
	350	unload_nls(sbi->nls_tab);
	351	sbi->nls_tab = nls_map;
	352	}
	353	return 1;
	354
	355	cleanup:
	356	if (nls_map && nls_map != (void *) -1)
	357	unload_nls(nls_map);
	358	return 0;
	359	}
	360
	361	static int jfs_remount(struct super_block sb, int flags, char *data)
	362	{
	363	s64 newLVSize = 0;
	364	int rc = 0;
	365	int flag = JFS_SBI(sb)->flag;
	366
	367	if (!parse_options(data, sb, &newLVSize, &flag)) {
	368	return -EINVAL;
	369	}
	370	if (newLVSize) {
	371	if (sb->s_flags & MS_RDONLY) {
	372	printk(KERN_ERR
	373	"JFS: resize requires volume to be mounted read-write\n");
	374	return -EROFS;
	375	}
	376	rc = jfs_extendfs(sb, newLVSize, 0);
	377	if (rc)
	378	return rc;
	379	}
	380
	381	if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
7fab479b DK	382	/*
	383	* Invalidate any previously read metadata. fsck may have
	384	* changed the on-disk data since we mounted r/o
	385	*/
	386	truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
	387
1da177e4 LT	388	JFS_SBI(sb)->flag = flag;
	389	return jfs_mount_rw(sb, 1);
	390	}
	391	if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
	392	rc = jfs_umount_rw(sb);
	393	JFS_SBI(sb)->flag = flag;
	394	return rc;
	395	}
	396	if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
	397	if (!(sb->s_flags & MS_RDONLY)) {
	398	rc = jfs_umount_rw(sb);
	399	if (rc)
	400	return rc;
	401	JFS_SBI(sb)->flag = flag;
	402	return jfs_mount_rw(sb, 1);
	403	}
	404	JFS_SBI(sb)->flag = flag;
	405
	406	return 0;
	407	}
	408
	409	static int jfs_fill_super(struct super_block sb, void data, int silent)
	410	{
	411	struct jfs_sb_info *sbi;
	412	struct inode *inode;
	413	int rc;
	414	s64 newLVSize = 0;
	415	int flag;
	416
	417	jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
	418
	419	if (!new_valid_dev(sb->s_bdev->bd_dev))
	420	return -EOVERFLOW;
	421
5b3030e3	422	sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
1da177e4 LT	423	if (!sbi)
1da177e4 LT	424	return -ENOSPC;
1da177e4 LT	425	sb->s_fs_info = sbi;
1da177e4 LT	426	sbi->sb = sb;
69eb66d7	427	sbi->uid = sbi->gid = sbi->umask = -1;
1da177e4 LT	428
	429	/* initialize the mount flag and determine the default error handler */
	430	flag = JFS_ERR_REMOUNT_RO;
	431
	432	if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
	433	kfree(sbi);
	434	return -EINVAL;
	435	}
	436	sbi->flag = flag;
	437
	438	#ifdef CONFIG_JFS_POSIX_ACL
	439	sb->s_flags \|= MS_POSIXACL;
	440	#endif
	441
	442	if (newLVSize) {
	443	printk(KERN_ERR "resize option for remount only\n");
	444	return -EINVAL;
	445	}
	446
	447	/*
	448	* Initialize blocksize to 4K.
	449	*/
	450	sb_set_blocksize(sb, PSIZE);
	451
	452	/*
	453	* Set method vectors.
	454	*/
	455	sb->s_op = &jfs_super_operations;
	456	sb->s_export_op = &jfs_export_operations;
	457
7fab479b DK	458	/*
	459	* Initialize direct-mapping inode/address-space
	460	*/
	461	inode = new_inode(sb);
	462	if (inode == NULL)
	463	goto out_kfree;
	464	inode->i_ino = 0;
	465	inode->i_nlink = 1;
	466	inode->i_size = sb->s_bdev->bd_inode->i_size;
	467	inode->i_mapping->a_ops = &jfs_metapage_aops;
ac17b8b5	468	insert_inode_hash(inode);
7fab479b DK	469	mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
	470
	471	sbi->direct_inode = inode;
	472
1da177e4 LT	473	rc = jfs_mount(sb);
	474	if (rc) {
	475	if (!silent) {
	476	jfs_err("jfs_mount failed w/return code = %d", rc);
	477	}
7fab479b	478	goto out_mount_failed;
1da177e4 LT	479	}
	480	if (sb->s_flags & MS_RDONLY)
	481	sbi->log = NULL;
	482	else {
	483	rc = jfs_mount_rw(sb, 0);
	484	if (rc) {
	485	if (!silent) {
	486	jfs_err("jfs_mount_rw failed, return code = %d",
	487	rc);
	488	}
	489	goto out_no_rw;
	490	}
	491	}
	492
	493	sb->s_magic = JFS_SUPER_MAGIC;
	494
	495	inode = iget(sb, ROOT_I);
	496	if (!inode \|\| is_bad_inode(inode))
	497	goto out_no_root;
	498	sb->s_root = d_alloc_root(inode);
	499	if (!sb->s_root)
	500	goto out_no_root;
	501
	502	if (sbi->mntflag & JFS_OS2)
	503	sb->s_root->d_op = &jfs_ci_dentry_operations;
	504
	505	/* logical blocks are represented by 40 bits in pxd_t, etc. */
	506	sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
	507	#if BITS_PER_LONG == 32
	508	/*
	509	* Page cache is indexed by long.
	510	* I would use MAX_LFS_FILESIZE, but it's only half as big
	511	*/
	512	sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
	513	#endif
	514	sb->s_time_gran = 1;
	515	return 0;
	516
	517	out_no_root:
	518	jfs_err("jfs_read_super: get root inode failed");
	519	if (inode)
	520	iput(inode);
	521
	522	out_no_rw:
	523	rc = jfs_umount(sb);
	524	if (rc) {
	525	jfs_err("jfs_umount failed with return code %d", rc);
	526	}
7fab479b	527	out_mount_failed:
28fd1298	528	filemap_write_and_wait(sbi->direct_inode->i_mapping);
7fab479b DK	529	truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
	530	make_bad_inode(sbi->direct_inode);
	531	iput(sbi->direct_inode);
	532	sbi->direct_inode = NULL;
1da177e4 LT	533	out_kfree:
	534	if (sbi->nls_tab)
	535	unload_nls(sbi->nls_tab);
	536	kfree(sbi);
	537	return -EINVAL;
	538	}
	539
	540	static void jfs_write_super_lockfs(struct super_block *sb)
	541	{
	542	struct jfs_sb_info *sbi = JFS_SBI(sb);
	543	struct jfs_log *log = sbi->log;
	544
	545	if (!(sb->s_flags & MS_RDONLY)) {
	546	txQuiesce(sb);
	547	lmLogShutdown(log);
	548	updateSuper(sb, FM_CLEAN);
	549	}
	550	}
	551
	552	static void jfs_unlockfs(struct super_block *sb)
	553	{
	554	struct jfs_sb_info *sbi = JFS_SBI(sb);
	555	struct jfs_log *log = sbi->log;
	556	int rc = 0;
	557
	558	if (!(sb->s_flags & MS_RDONLY)) {
	559	updateSuper(sb, FM_MOUNT);
	560	if ((rc = lmLogInit(log)))
	561	jfs_err("jfs_unlock failed with return code %d", rc);
	562	else
	563	txResume(sb);
	564	}
	565	}
	566
454e2398 DH	567	static int jfs_get_sb(struct file_system_type *fs_type,
454e2398 DH	568	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	569	{
454e2398 DH	570	return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
454e2398 DH	571	mnt);
1da177e4 LT	572	}
	573
	574	static int jfs_sync_fs(struct super_block *sb, int wait)
	575	{
	576	struct jfs_log *log = JFS_SBI(sb)->log;
	577
	578	/* log == NULL indicates read-only mount */
1c627829	579	if (log) {
1da177e4	580	jfs_flush_journal(log, wait);
cbc3d65e	581	jfs_syncpt(log, 0);
1c627829	582	}
1da177e4 LT	583
	584	return 0;
	585	}
	586
8fc2751b MB	587	static int jfs_show_options(struct seq_file seq, struct vfsmount vfs)
	588	{
	589	struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
	590
69eb66d7 DK	591	if (sbi->uid != -1)
	592	seq_printf(seq, ",uid=%d", sbi->uid);
	593	if (sbi->gid != -1)
	594	seq_printf(seq, ",gid=%d", sbi->gid);
	595	if (sbi->umask != -1)
	596	seq_printf(seq, ",umask=%03o", sbi->umask);
8fc2751b MB	597	if (sbi->flag & JFS_NOINTEGRITY)
8fc2751b MB	598	seq_puts(seq, ",nointegrity");
8fc2751b MB	599
	600	#if defined(CONFIG_QUOTA)
	601	if (sbi->flag & JFS_USRQUOTA)
	602	seq_puts(seq, ",usrquota");
	603
	604	if (sbi->flag & JFS_GRPQUOTA)
	605	seq_puts(seq, ",grpquota");
	606	#endif
	607
	608	return 0;
	609	}
	610
1da177e4 LT	611	static struct super_operations jfs_super_operations = {
	612	.alloc_inode = jfs_alloc_inode,
	613	.destroy_inode = jfs_destroy_inode,
	614	.read_inode = jfs_read_inode,
	615	.dirty_inode = jfs_dirty_inode,
	616	.write_inode = jfs_write_inode,
	617	.delete_inode = jfs_delete_inode,
	618	.put_super = jfs_put_super,
	619	.sync_fs = jfs_sync_fs,
	620	.write_super_lockfs = jfs_write_super_lockfs,
	621	.unlockfs = jfs_unlockfs,
	622	.statfs = jfs_statfs,
	623	.remount_fs = jfs_remount,
8fc2751b	624	.show_options = jfs_show_options
1da177e4 LT	625	};
	626
	627	static struct export_operations jfs_export_operations = {
	628	.get_parent = jfs_get_parent,
	629	};
	630
	631	static struct file_system_type jfs_fs_type = {
	632	.owner = THIS_MODULE,
	633	.name = "jfs",
	634	.get_sb = jfs_get_sb,
	635	.kill_sb = kill_block_super,
	636	.fs_flags = FS_REQUIRES_DEV,
	637	};
	638
1da177e4 LT	639	static void init_once(void foo, kmem_cache_t cachep, unsigned long flags)
	640	{
	641	struct jfs_inode_info jfs_ip = (struct jfs_inode_info ) foo;
	642
	643	if ((flags & (SLAB_CTOR_VERIFY \| SLAB_CTOR_CONSTRUCTOR)) ==
	644	SLAB_CTOR_CONSTRUCTOR) {
	645	memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
	646	INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
	647	init_rwsem(&jfs_ip->rdwrlock);
1de87444	648	mutex_init(&jfs_ip->commit_mutex);
1da177e4 LT	649	init_rwsem(&jfs_ip->xattr_sem);
	650	spin_lock_init(&jfs_ip->ag_lock);
	651	jfs_ip->active_ag = -1;
	652	#ifdef CONFIG_JFS_POSIX_ACL
	653	jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
	654	jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
	655	#endif
	656	inode_init_once(&jfs_ip->vfs_inode);
	657	}
	658	}
	659
	660	static int __init init_jfs_fs(void)
	661	{
	662	int i;
	663	int rc;
	664
	665	jfs_inode_cachep =
	666	kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
fffb60f9 PJ	667	SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD,
fffb60f9 PJ	668	init_once, NULL);
1da177e4 LT	669	if (jfs_inode_cachep == NULL)
	670	return -ENOMEM;
	671
	672	/*
	673	* Metapage initialization
	674	*/
	675	rc = metapage_init();
	676	if (rc) {
	677	jfs_err("metapage_init failed w/rc = %d", rc);
	678	goto free_slab;
	679	}
	680
	681	/*
	682	* Transaction Manager initialization
	683	*/
	684	rc = txInit();
	685	if (rc) {
	686	jfs_err("txInit failed w/rc = %d", rc);
	687	goto free_metapage;
	688	}
	689
	690	/*
	691	* I/O completion thread (endio)
	692	*/
91dbb4de CH	693	jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
	694	if (IS_ERR(jfsIOthread)) {
	695	rc = PTR_ERR(jfsIOthread);
	696	jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1da177e4 LT	697	goto end_txmngr;
1da177e4 LT	698	}
1da177e4 LT	699
	700	if (commit_threads < 1)
	701	commit_threads = num_online_cpus();
	702	if (commit_threads > MAX_COMMIT_THREADS)
	703	commit_threads = MAX_COMMIT_THREADS;
	704
	705	for (i = 0; i < commit_threads; i++) {
91dbb4de CH	706	jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
	707	if (IS_ERR(jfsCommitThread[i])) {
	708	rc = PTR_ERR(jfsCommitThread[i]);
	709	jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1da177e4 LT	710	commit_threads = i;
	711	goto kill_committask;
	712	}
1da177e4 LT	713	}
1da177e4 LT	714
91dbb4de CH	715	jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
	716	if (IS_ERR(jfsSyncThread)) {
	717	rc = PTR_ERR(jfsSyncThread);
	718	jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1da177e4 LT	719	goto kill_committask;
1da177e4 LT	720	}
1da177e4 LT	721
	722	#ifdef PROC_FS_JFS
	723	jfs_proc_init();
	724	#endif
	725
	726	return register_filesystem(&jfs_fs_type);
	727
	728	kill_committask:
1da177e4	729	for (i = 0; i < commit_threads; i++)
91dbb4de CH	730	kthread_stop(jfsCommitThread[i]);
91dbb4de CH	731	kthread_stop(jfsIOthread);
1da177e4 LT	732	end_txmngr:
	733	txExit();
	734	free_metapage:
	735	metapage_exit();
	736	free_slab:
	737	kmem_cache_destroy(jfs_inode_cachep);
	738	return rc;
	739	}
	740
	741	static void __exit exit_jfs_fs(void)
	742	{
	743	int i;
	744
	745	jfs_info("exit_jfs_fs called");
	746
1da177e4 LT	747	txExit();
1da177e4 LT	748	metapage_exit();
91dbb4de CH	749
91dbb4de CH	750	kthread_stop(jfsIOthread);
1da177e4	751	for (i = 0; i < commit_threads; i++)
91dbb4de CH	752	kthread_stop(jfsCommitThread[i]);
91dbb4de CH	753	kthread_stop(jfsSyncThread);
1da177e4 LT	754	#ifdef PROC_FS_JFS
	755	jfs_proc_clean();
	756	#endif
	757	unregister_filesystem(&jfs_fs_type);
	758	kmem_cache_destroy(jfs_inode_cachep);
	759	}
	760
	761	module_init(init_jfs_fs)
	762	module_exit(exit_jfs_fs)