Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1044 insertions, 0 deletions

diff --git a/fs/jfs/super.c b/fs/jfs/super.c
new file mode 100644
index 000000000..2e2f7f6d3
--- /dev/null
+++ b/fs/jfs/super.c
@@ -0,0 +1,1044 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *   Copyright (C) International Business Machines Corp., 2000-2004
+ *   Portions Copyright (C) Christoph Hellwig, 2001-2002
+ */
+
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/parser.h>
+#include <linux/completion.h>
+#include <linux/vfs.h>
+#include <linux/quotaops.h>
+#include <linux/mount.h>
+#include <linux/moduleparam.h>
+#include <linux/kthread.h>
+#include <linux/posix_acl.h>
+#include <linux/buffer_head.h>
+#include <linux/exportfs.h>
+#include <linux/crc32.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/seq_file.h>
+#include <linux/blkdev.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"
+#include "jfs_xattr.h"
+#include "jfs_dinode.h"
+
+MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
+MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
+MODULE_LICENSE("GPL");
+
+static struct kmem_cache *jfs_inode_cachep;
+
+static const struct super_operations jfs_super_operations;
+static const struct export_operations jfs_export_operations;
+static struct file_system_type jfs_fs_type;
+
+#define MAX_COMMIT_THREADS 64
+static int commit_threads;
+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_rdonly(sb))
+		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",
+			sb->s_id);
+		sb->s_flags |= SB_RDONLY;
+	}
+
+	/* nothing is done for continue beyond marking the superblock dirty */
+}
+
+void jfs_error(struct super_block *sb, const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	va_start(args, fmt);
+
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	pr_err("ERROR: (device %s): %ps: %pV\n",
+	       sb->s_id, __builtin_return_address(0), &vaf);
+
+	va_end(args);
+
+	jfs_handle_error(sb);
+}
+
+static struct inode *jfs_alloc_inode(struct super_block *sb)
+{
+	struct jfs_inode_info *jfs_inode;
+
+	jfs_inode = alloc_inode_sb(sb, jfs_inode_cachep, GFP_NOFS);
+	if (!jfs_inode)
+		return NULL;
+#ifdef CONFIG_QUOTA
+	memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot));
+#endif
+	return &jfs_inode->vfs_inode;
+}
+
+static void jfs_free_inode(struct inode *inode)
+{
+	kmem_cache_free(jfs_inode_cachep, JFS_IP(inode));
+}
+
+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 many 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_fsid.val[0] = crc32_le(0, (char *)&sbi->uuid,
+				      sizeof(sbi->uuid)/2);
+	buf->f_fsid.val[1] = crc32_le(0,
+				      (char *)&sbi->uuid + sizeof(sbi->uuid)/2,
+				      sizeof(sbi->uuid)/2);
+
+	buf->f_namelen = JFS_NAME_MAX;
+	return 0;
+}
+
+#ifdef CONFIG_QUOTA
+static int jfs_quota_off(struct super_block *sb, int type);
+static int jfs_quota_on(struct super_block *sb, int type, int format_id,
+			const struct path *path);
+
+static void jfs_quota_off_umount(struct super_block *sb)
+{
+	int type;
+
+	for (type = 0; type < MAXQUOTAS; type++)
+		jfs_quota_off(sb, type);
+}
+
+static const struct quotactl_ops jfs_quotactl_ops = {
+	.quota_on	= jfs_quota_on,
+	.quota_off	= jfs_quota_off,
+	.quota_sync	= dquot_quota_sync,
+	.get_state	= dquot_get_state,
+	.set_info	= dquot_set_dqinfo,
+	.get_dqblk	= dquot_get_dqblk,
+	.set_dqblk	= dquot_set_dqblk,
+	.get_nextdqblk	= dquot_get_next_dqblk,
+};
+#else
+static inline void jfs_quota_off_umount(struct super_block *sb)
+{
+}
+#endif
+
+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");
+
+	jfs_quota_off_umount(sb);
+
+	rc = jfs_umount(sb);
+	if (rc)
+		jfs_err("jfs_umount failed with return code %d", rc);
+
+	unload_nls(sbi->nls_tab);
+
+	truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
+	iput(sbi->direct_inode);
+
+	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,
+	Opt_discard, Opt_nodiscard, Opt_discard_minblk
+};
+
+static const 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_quota, "quota"},
+	{Opt_usrquota, "usrquota"},
+	{Opt_grpquota, "grpquota"},
+	{Opt_uid, "uid=%u"},
+	{Opt_gid, "gid=%u"},
+	{Opt_umask, "umask=%u"},
+	{Opt_discard, "discard"},
+	{Opt_nodiscard, "nodiscard"},
+	{Opt_discard_minblk, "discard=%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) {
+					pr_err("JFS: charset not found\n");
+					goto cleanup;
+				}
+			}
+			break;
+		case Opt_resize:
+		{
+			char *resize = args[0].from;
+			int rc = kstrtoll(resize, 0, newLVSize);
+
+			if (rc)
+				goto cleanup;
+			break;
+		}
+		case Opt_resize_nosize:
+		{
+			*newLVSize = sb_bdev_nr_blocks(sb);
+			if (*newLVSize == 0)
+				pr_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 {
+				pr_err("JFS: %s is an invalid error handler\n",
+				       errors);
+				goto cleanup;
+			}
+			break;
+		}
+
+#ifdef 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:
+			pr_err("JFS: quota operations not supported\n");
+			break;
+#endif
+		case Opt_uid:
+		{
+			char *uid = args[0].from;
+			uid_t val;
+			int rc = kstrtouint(uid, 0, &val);
+
+			if (rc)
+				goto cleanup;
+			sbi->uid = make_kuid(current_user_ns(), val);
+			if (!uid_valid(sbi->uid))
+				goto cleanup;
+			break;
+		}
+
+		case Opt_gid:
+		{
+			char *gid = args[0].from;
+			gid_t val;
+			int rc = kstrtouint(gid, 0, &val);
+
+			if (rc)
+				goto cleanup;
+			sbi->gid = make_kgid(current_user_ns(), val);
+			if (!gid_valid(sbi->gid))
+				goto cleanup;
+			break;
+		}
+
+		case Opt_umask:
+		{
+			char *umask = args[0].from;
+			int rc = kstrtouint(umask, 8, &sbi->umask);
+
+			if (rc)
+				goto cleanup;
+			if (sbi->umask & ~0777) {
+				pr_err("JFS: Invalid value of umask\n");
+				goto cleanup;
+			}
+			break;
+		}
+
+		case Opt_discard:
+			/* if set to 1, even copying files will cause
+			 * trimming :O
+			 * -> user has more control over the online trimming
+			 */
+			sbi->minblks_trim = 64;
+			if (bdev_max_discard_sectors(sb->s_bdev))
+				*flag |= JFS_DISCARD;
+			else
+				pr_err("JFS: discard option not supported on device\n");
+			break;
+
+		case Opt_nodiscard:
+			*flag &= ~JFS_DISCARD;
+			break;
+
+		case Opt_discard_minblk:
+		{
+			char *minblks_trim = args[0].from;
+			int rc;
+			if (bdev_max_discard_sectors(sb->s_bdev)) {
+				*flag |= JFS_DISCARD;
+				rc = kstrtouint(minblks_trim, 0,
+						&sbi->minblks_trim);
+				if (rc)
+					goto cleanup;
+			} else
+				pr_err("JFS: discard option not supported on device\n");
+			break;
+		}
+
+		default:
+			printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
+			       p);
+			goto cleanup;
+		}
+	}
+
+	if (nls_map != (void *) -1) {
+		/* Discard old (if remount) */
+		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;
+	int ret;
+
+	sync_filesystem(sb);
+	if (!parse_options(data, sb, &newLVSize, &flag))
+		return -EINVAL;
+
+	if (newLVSize) {
+		if (sb_rdonly(sb)) {
+			pr_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_rdonly(sb) && !(*flags & SB_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;
+		ret = jfs_mount_rw(sb, 1);
+
+		/* mark the fs r/w for quota activity */
+		sb->s_flags &= ~SB_RDONLY;
+
+		dquot_resume(sb, -1);
+		return ret;
+	}
+	if (!sb_rdonly(sb) && (*flags & SB_RDONLY)) {
+		rc = dquot_suspend(sb, -1);
+		if (rc < 0)
+			return rc;
+		rc = jfs_umount_rw(sb);
+		JFS_SBI(sb)->flag = flag;
+		return rc;
+	}
+	if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
+		if (!sb_rdonly(sb)) {
+			rc = jfs_umount_rw(sb);
+			if (rc)
+				return rc;
+
+			JFS_SBI(sb)->flag = flag;
+			ret = jfs_mount_rw(sb, 1);
+			return ret;
+		}
+	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, ret = -EINVAL;
+
+	jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
+
+	sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
+	if (!sbi)
+		return -ENOMEM;
+
+	sb->s_fs_info = sbi;
+	sb->s_max_links = JFS_LINK_MAX;
+	sb->s_time_min = 0;
+	sb->s_time_max = U32_MAX;
+	sbi->sb = sb;
+	sbi->uid = INVALID_UID;
+	sbi->gid = INVALID_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))
+		goto out_kfree;
+	sbi->flag = flag;
+
+#ifdef CONFIG_JFS_POSIX_ACL
+	sb->s_flags |= SB_POSIXACL;
+#endif
+
+	if (newLVSize) {
+		pr_err("resize option for remount only\n");
+		goto out_kfree;
+	}
+
+	/*
+	 * 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;
+	sb->s_xattr = jfs_xattr_handlers;
+#ifdef CONFIG_QUOTA
+	sb->dq_op = &dquot_operations;
+	sb->s_qcop = &jfs_quotactl_ops;
+	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
+#endif
+
+	/*
+	 * Initialize direct-mapping inode/address-space
+	 */
+	inode = new_inode(sb);
+	if (inode == NULL) {
+		ret = -ENOMEM;
+		goto out_unload;
+	}
+	inode->i_size = bdev_nr_bytes(sb->s_bdev);
+	inode->i_mapping->a_ops = &jfs_metapage_aops;
+	inode_fake_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_rdonly(sb))
+		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;
+
+	if (sbi->mntflag & JFS_OS2)
+		sb->s_d_op = &jfs_ci_dentry_operations;
+
+	inode = jfs_iget(sb, ROOT_I);
+	if (IS_ERR(inode)) {
+		ret = PTR_ERR(inode);
+		goto out_no_rw;
+	}
+	sb->s_root = d_make_root(inode);
+	if (!sb->s_root)
+		goto out_no_root;
+
+	/* logical blocks are represented by 40 bits in pxd_t, etc.
+	 * and page cache is indexed by long
+	 */
+	sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE);
+	sb->s_time_gran = 1;
+	return 0;
+
+out_no_root:
+	jfs_err("jfs_read_super: get root dentry failed");
+
+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_unload:
+	unload_nls(sbi->nls_tab);
+out_kfree:
+	kfree(sbi);
+	return ret;
+}
+
+static int jfs_freeze(struct super_block *sb)
+{
+	struct jfs_sb_info *sbi = JFS_SBI(sb);
+	struct jfs_log *log = sbi->log;
+	int rc = 0;
+
+	if (!sb_rdonly(sb)) {
+		txQuiesce(sb);
+		rc = lmLogShutdown(log);
+		if (rc) {
+			jfs_error(sb, "lmLogShutdown failed\n");
+
+			/* let operations fail rather than hang */
+			txResume(sb);
+
+			return rc;
+		}
+		rc = updateSuper(sb, FM_CLEAN);
+		if (rc) {
+			jfs_err("jfs_freeze: updateSuper failed");
+			/*
+			 * Don't fail here. Everything succeeded except
+			 * marking the superblock clean, so there's really
+			 * no harm in leaving it frozen for now.
+			 */
+		}
+	}
+	return 0;
+}
+
+static int jfs_unfreeze(struct super_block *sb)
+{
+	struct jfs_sb_info *sbi = JFS_SBI(sb);
+	struct jfs_log *log = sbi->log;
+	int rc = 0;
+
+	if (!sb_rdonly(sb)) {
+		rc = updateSuper(sb, FM_MOUNT);
+		if (rc) {
+			jfs_error(sb, "updateSuper failed\n");
+			goto out;
+		}
+		rc = lmLogInit(log);
+		if (rc)
+			jfs_error(sb, "lmLogInit failed\n");
+out:
+		txResume(sb);
+	}
+	return rc;
+}
+
+static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return mount_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) {
+		/*
+		 * Write quota structures to quota file, sync_blockdev() will
+		 * write them to disk later
+		 */
+		dquot_writeback_dquots(sb, -1);
+		jfs_flush_journal(log, wait);
+		jfs_syncpt(log, 0);
+	}
+
+	return 0;
+}
+
+static int jfs_show_options(struct seq_file *seq, struct dentry *root)
+{
+	struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
+
+	if (uid_valid(sbi->uid))
+		seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
+	if (gid_valid(sbi->gid))
+		seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
+	if (sbi->umask != -1)
+		seq_printf(seq, ",umask=%03o", sbi->umask);
+	if (sbi->flag & JFS_NOINTEGRITY)
+		seq_puts(seq, ",nointegrity");
+	if (sbi->flag & JFS_DISCARD)
+		seq_printf(seq, ",discard=%u", sbi->minblks_trim);
+	if (sbi->nls_tab)
+		seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
+	if (sbi->flag & JFS_ERR_CONTINUE)
+		seq_printf(seq, ",errors=continue");
+	if (sbi->flag & JFS_ERR_PANIC)
+		seq_printf(seq, ",errors=panic");
+
+#ifdef CONFIG_QUOTA
+	if (sbi->flag & JFS_USRQUOTA)
+		seq_puts(seq, ",usrquota");
+
+	if (sbi->flag & JFS_GRPQUOTA)
+		seq_puts(seq, ",grpquota");
+#endif
+
+	return 0;
+}
+
+#ifdef CONFIG_QUOTA
+
+/* Read data from quotafile - avoid pagecache and such because we cannot afford
+ * acquiring the locks... As quota files are never truncated and quota code
+ * itself serializes the operations (and no one else should touch the files)
+ * we don't have to be afraid of races */
+static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
+			      size_t len, loff_t off)
+{
+	struct inode *inode = sb_dqopt(sb)->files[type];
+	sector_t blk = off >> sb->s_blocksize_bits;
+	int err = 0;
+	int offset = off & (sb->s_blocksize - 1);
+	int tocopy;
+	size_t toread;
+	struct buffer_head tmp_bh;
+	struct buffer_head *bh;
+	loff_t i_size = i_size_read(inode);
+
+	if (off > i_size)
+		return 0;
+	if (off+len > i_size)
+		len = i_size-off;
+	toread = len;
+	while (toread > 0) {
+		tocopy = min_t(size_t, sb->s_blocksize - offset, toread);
+
+		tmp_bh.b_state = 0;
+		tmp_bh.b_size = i_blocksize(inode);
+		err = jfs_get_block(inode, blk, &tmp_bh, 0);
+		if (err)
+			return err;
+		if (!buffer_mapped(&tmp_bh))	/* A hole? */
+			memset(data, 0, tocopy);
+		else {
+			bh = sb_bread(sb, tmp_bh.b_blocknr);
+			if (!bh)
+				return -EIO;
+			memcpy(data, bh->b_data+offset, tocopy);
+			brelse(bh);
+		}
+		offset = 0;
+		toread -= tocopy;
+		data += tocopy;
+		blk++;
+	}
+	return len;
+}
+
+/* Write to quotafile */
+static ssize_t jfs_quota_write(struct super_block *sb, int type,
+			       const char *data, size_t len, loff_t off)
+{
+	struct inode *inode = sb_dqopt(sb)->files[type];
+	sector_t blk = off >> sb->s_blocksize_bits;
+	int err = 0;
+	int offset = off & (sb->s_blocksize - 1);
+	int tocopy;
+	size_t towrite = len;
+	struct buffer_head tmp_bh;
+	struct buffer_head *bh;
+
+	inode_lock(inode);
+	while (towrite > 0) {
+		tocopy = min_t(size_t, sb->s_blocksize - offset, towrite);
+
+		tmp_bh.b_state = 0;
+		tmp_bh.b_size = i_blocksize(inode);
+		err = jfs_get_block(inode, blk, &tmp_bh, 1);
+		if (err)
+			goto out;
+		if (offset || tocopy != sb->s_blocksize)
+			bh = sb_bread(sb, tmp_bh.b_blocknr);
+		else
+			bh = sb_getblk(sb, tmp_bh.b_blocknr);
+		if (!bh) {
+			err = -EIO;
+			goto out;
+		}
+		lock_buffer(bh);
+		memcpy(bh->b_data+offset, data, tocopy);
+		flush_dcache_page(bh->b_page);
+		set_buffer_uptodate(bh);
+		mark_buffer_dirty(bh);
+		unlock_buffer(bh);
+		brelse(bh);
+		offset = 0;
+		towrite -= tocopy;
+		data += tocopy;
+		blk++;
+	}
+out:
+	if (len == towrite) {
+		inode_unlock(inode);
+		return err;
+	}
+	if (inode->i_size < off+len-towrite)
+		i_size_write(inode, off+len-towrite);
+	inode->i_mtime = inode_set_ctime_current(inode);
+	mark_inode_dirty(inode);
+	inode_unlock(inode);
+	return len - towrite;
+}
+
+static struct dquot **jfs_get_dquots(struct inode *inode)
+{
+	return JFS_IP(inode)->i_dquot;
+}
+
+static int jfs_quota_on(struct super_block *sb, int type, int format_id,
+			const struct path *path)
+{
+	int err;
+	struct inode *inode;
+
+	err = dquot_quota_on(sb, type, format_id, path);
+	if (err)
+		return err;
+
+	inode = d_inode(path->dentry);
+	inode_lock(inode);
+	JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL;
+	inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
+			S_NOATIME | S_IMMUTABLE);
+	inode_unlock(inode);
+	mark_inode_dirty(inode);
+
+	return 0;
+}
+
+static int jfs_quota_off(struct super_block *sb, int type)
+{
+	struct inode *inode = sb_dqopt(sb)->files[type];
+	int err;
+
+	if (!inode || !igrab(inode))
+		goto out;
+
+	err = dquot_quota_off(sb, type);
+	if (err)
+		goto out_put;
+
+	inode_lock(inode);
+	JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL);
+	inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
+	inode_unlock(inode);
+	mark_inode_dirty(inode);
+out_put:
+	iput(inode);
+	return err;
+out:
+	return dquot_quota_off(sb, type);
+}
+#endif
+
+static const struct super_operations jfs_super_operations = {
+	.alloc_inode	= jfs_alloc_inode,
+	.free_inode	= jfs_free_inode,
+	.dirty_inode	= jfs_dirty_inode,
+	.write_inode	= jfs_write_inode,
+	.evict_inode	= jfs_evict_inode,
+	.put_super	= jfs_put_super,
+	.sync_fs	= jfs_sync_fs,
+	.freeze_fs	= jfs_freeze,
+	.unfreeze_fs	= jfs_unfreeze,
+	.statfs		= jfs_statfs,
+	.remount_fs	= jfs_remount,
+	.show_options	= jfs_show_options,
+#ifdef CONFIG_QUOTA
+	.quota_read	= jfs_quota_read,
+	.quota_write	= jfs_quota_write,
+	.get_dquots	= jfs_get_dquots,
+#endif
+};
+
+static const struct export_operations jfs_export_operations = {
+	.fh_to_dentry	= jfs_fh_to_dentry,
+	.fh_to_parent	= jfs_fh_to_parent,
+	.get_parent	= jfs_get_parent,
+};
+
+static struct file_system_type jfs_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "jfs",
+	.mount		= jfs_do_mount,
+	.kill_sb	= kill_block_super,
+	.fs_flags	= FS_REQUIRES_DEV,
+};
+MODULE_ALIAS_FS("jfs");
+
+static void init_once(void *foo)
+{
+	struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
+
+	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;
+	inode_init_once(&jfs_ip->vfs_inode);
+}
+
+static int __init init_jfs_fs(void)
+{
+	int i;
+	int rc;
+
+	jfs_inode_cachep =
+	    kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info),
+			0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
+			offsetof(struct jfs_inode_info, i_inline_all),
+			sizeof_field(struct jfs_inode_info, i_inline_all),
+			init_once);
+	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
+
+	rc = register_filesystem(&jfs_fs_type);
+	if (!rc)
+		return 0;
+
+#ifdef PROC_FS_JFS
+	jfs_proc_clean();
+#endif
+	kthread_stop(jfsSyncThread);
+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);
+
+	/*
+	 * Make sure all delayed rcu free inodes are flushed before we
+	 * destroy cache.
+	 */
+	rcu_barrier();
+	kmem_cache_destroy(jfs_inode_cachep);
+}
+
+module_init(init_jfs_fs)
+module_exit(exit_jfs_fs)