Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

9 files changed, 1383 insertions, 0 deletions

diff --git a/fs/qnx4/Makefile b/fs/qnx4/Makefile
new file mode 100644
index 00000000000..502d7fe98ba
--- /dev/null
+++ b/fs/qnx4/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the linux qnx4-filesystem routines.
+#
+
+obj-$(CONFIG_QNX4FS_FS) += qnx4.o
+
+qnx4-objs := inode.o dir.o namei.o file.o bitmap.o truncate.o fsync.o
diff --git a/fs/qnx4/README b/fs/qnx4/README
new file mode 100644
index 00000000000..1f1e320d91d
--- /dev/null
+++ b/fs/qnx4/README
@@ -0,0 +1,9 @@
+
+  This is a snapshot of the QNX4 filesystem for Linux.
+  Please send diffs and remarks to <al@alarsen.net> .
+  
+Credits :
+
+Richard "Scuba" A. Frowijn     <scuba@wxs.nl>
+Frank "Jedi/Sector One" Denis  <j@pureftpd.org>
+Anders Larsen                  <al@alarsen.net> (Maintainer)
diff --git a/fs/qnx4/bitmap.c b/fs/qnx4/bitmap.c
new file mode 100644
index 00000000000..99125392765
--- /dev/null
+++ b/fs/qnx4/bitmap.c
@@ -0,0 +1,165 @@
+/*
+ * QNX4 file system, Linux implementation.
+ *
+ * Version : 0.2.1
+ *
+ * Using parts of the xiafs filesystem.
+ *
+ * History :
+ *
+ * 28-05-1998 by Richard Frowijn : first release.
+ * 20-06-1998 by Frank Denis : basic optimisations.
+ * 25-06-1998 by Frank Denis : qnx4_is_free, qnx4_set_bitmap, qnx4_bmap .
+ * 28-06-1998 by Frank Denis : qnx4_free_inode (to be fixed) .
+ */
+
+#include <linux/config.h>
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/qnx4_fs.h>
+#include <linux/stat.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/buffer_head.h>
+#include <linux/bitops.h>
+
+int qnx4_new_block(struct super_block *sb)
+{
+	return 0;
+}
+
+static void count_bits(register const char *bmPart, register int size,
+		       int *const tf)
+{
+	char b;
+	int tot = *tf;
+
+	if (size > QNX4_BLOCK_SIZE) {
+		size = QNX4_BLOCK_SIZE;
+	}
+	do {
+		b = *bmPart++;
+		if ((b & 1) == 0)
+			tot++;
+		if ((b & 2) == 0)
+			tot++;
+		if ((b & 4) == 0)
+			tot++;
+		if ((b & 8) == 0)
+			tot++;
+		if ((b & 16) == 0)
+			tot++;
+		if ((b & 32) == 0)
+			tot++;
+		if ((b & 64) == 0)
+			tot++;
+		if ((b & 128) == 0)
+			tot++;
+		size--;
+	} while (size != 0);
+	*tf = tot;
+}
+
+unsigned long qnx4_count_free_blocks(struct super_block *sb)
+{
+	int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1;
+	int total = 0;
+	int total_free = 0;
+	int offset = 0;
+	int size = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size);
+	struct buffer_head *bh;
+
+	while (total < size) {
+		if ((bh = sb_bread(sb, start + offset)) == NULL) {
+			printk("qnx4: I/O error in counting free blocks\n");
+			break;
+		}
+		count_bits(bh->b_data, size - total, &total_free);
+		brelse(bh);
+		total += QNX4_BLOCK_SIZE;
+		offset++;
+	}
+
+	return total_free;
+}
+
+#ifdef CONFIG_QNX4FS_RW
+
+int qnx4_is_free(struct super_block *sb, long block)
+{
+	int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1;
+	int size = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size);
+	struct buffer_head *bh;
+	const char *g;
+	int ret = -EIO;
+
+	start += block / (QNX4_BLOCK_SIZE * 8);
+	QNX4DEBUG(("qnx4: is_free requesting block [%lu], bitmap in block [%lu]\n",
+		   (unsigned long) block, (unsigned long) start));
+	(void) size;		/* CHECKME */
+	bh = sb_bread(sb, start);
+	if (bh == NULL) {
+		return -EIO;
+	}
+	g = bh->b_data + (block % QNX4_BLOCK_SIZE);
+	if (((*g) & (1 << (block % 8))) == 0) {
+		QNX4DEBUG(("qnx4: is_free -> block is free\n"));
+		ret = 1;
+	} else {
+		QNX4DEBUG(("qnx4: is_free -> block is busy\n"));
+		ret = 0;
+	}
+	brelse(bh);
+
+	return ret;
+}
+
+int qnx4_set_bitmap(struct super_block *sb, long block, int busy)
+{
+	int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1;
+	int size = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size);
+	struct buffer_head *bh;
+	char *g;
+
+	start += block / (QNX4_BLOCK_SIZE * 8);
+	QNX4DEBUG(("qnx4: set_bitmap requesting block [%lu], bitmap in block [%lu]\n",
+		   (unsigned long) block, (unsigned long) start));
+	(void) size;		/* CHECKME */
+	bh = sb_bread(sb, start);
+	if (bh == NULL) {
+		return -EIO;
+	}
+	g = bh->b_data + (block % QNX4_BLOCK_SIZE);
+	if (busy == 0) {
+		(*g) &= ~(1 << (block % 8));
+	} else {
+		(*g) |= (1 << (block % 8));
+	}
+	mark_buffer_dirty(bh);
+	brelse(bh);
+
+	return 0;
+}
+
+static void qnx4_clear_inode(struct inode *inode)
+{
+	struct qnx4_inode_entry *qnx4_ino = qnx4_raw_inode(inode);
+	/* What for? */
+	memset(qnx4_ino->di_fname, 0, sizeof qnx4_ino->di_fname);
+	qnx4_ino->di_size = 0;
+	qnx4_ino->di_num_xtnts = 0;
+	qnx4_ino->di_mode = 0;
+	qnx4_ino->di_status = 0;
+}
+
+void qnx4_free_inode(struct inode *inode)
+{
+	if (inode->i_ino < 1) {
+		printk("free_inode: inode 0 or nonexistent inode\n");
+		return;
+	}
+	qnx4_clear_inode(inode);
+	clear_inode(inode);
+}
+
+#endif
diff --git a/fs/qnx4/dir.c b/fs/qnx4/dir.c
new file mode 100644
index 00000000000..cd66147cca0
--- /dev/null
+++ b/fs/qnx4/dir.c
@@ -0,0 +1,99 @@
+/*
+ * QNX4 file system, Linux implementation.
+ *
+ * Version : 0.2.1
+ *
+ * Using parts of the xiafs filesystem.
+ *
+ * History :
+ *
+ * 28-05-1998 by Richard Frowijn : first release.
+ * 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support.
+ */
+
+#include <linux/config.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/qnx4_fs.h>
+#include <linux/stat.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+
+
+static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+	struct inode *inode = filp->f_dentry->d_inode;
+	unsigned int offset;
+	struct buffer_head *bh;
+	struct qnx4_inode_entry *de;
+	struct qnx4_link_info *le;
+	unsigned long blknum;
+	int ix, ino;
+	int size;
+
+	QNX4DEBUG(("qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
+	QNX4DEBUG(("filp->f_pos         = %ld\n", (long) filp->f_pos));
+
+	lock_kernel();
+
+	while (filp->f_pos < inode->i_size) {
+		blknum = qnx4_block_map( inode, filp->f_pos >> QNX4_BLOCK_SIZE_BITS );
+		bh = sb_bread(inode->i_sb, blknum);
+		if(bh==NULL) {
+			printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
+			break;
+		}
+		ix = (int)(filp->f_pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
+		while (ix < QNX4_INODES_PER_BLOCK) {
+			offset = ix * QNX4_DIR_ENTRY_SIZE;
+			de = (struct qnx4_inode_entry *) (bh->b_data + offset);
+			size = strlen(de->di_fname);
+			if (size) {
+				if ( !( de->di_status & QNX4_FILE_LINK ) && size > QNX4_SHORT_NAME_MAX )
+					size = QNX4_SHORT_NAME_MAX;
+				else if ( size > QNX4_NAME_MAX )
+					size = QNX4_NAME_MAX;
+
+				if ( ( de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK) ) != 0 ) {
+					QNX4DEBUG(("qnx4_readdir:%.*s\n", size, de->di_fname));
+					if ( ( de->di_status & QNX4_FILE_LINK ) == 0 )
+						ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
+					else {
+						le  = (struct qnx4_link_info*)de;
+						ino = ( le->dl_inode_blk - 1 ) *
+							QNX4_INODES_PER_BLOCK +
+							le->dl_inode_ndx;
+					}
+					if (filldir(dirent, de->di_fname, size, filp->f_pos, ino, DT_UNKNOWN) < 0) {
+						brelse(bh);
+						goto out;
+					}
+				}
+			}
+			ix++;
+			filp->f_pos += QNX4_DIR_ENTRY_SIZE;
+		}
+		brelse(bh);
+	}
+out:
+	unlock_kernel();
+	return 0;
+}
+
+struct file_operations qnx4_dir_operations =
+{
+	.read		= generic_read_dir,
+	.readdir	= qnx4_readdir,
+	.fsync		= file_fsync,
+};
+
+struct inode_operations qnx4_dir_inode_operations =
+{
+	.lookup		= qnx4_lookup,
+#ifdef CONFIG_QNX4FS_RW
+	.create		= qnx4_create,
+	.unlink		= qnx4_unlink,
+	.rmdir		= qnx4_rmdir,
+#endif
+};
diff --git a/fs/qnx4/file.c b/fs/qnx4/file.c
new file mode 100644
index 00000000000..b471315e24e
--- /dev/null
+++ b/fs/qnx4/file.c
@@ -0,0 +1,42 @@
+/*
+ * QNX4 file system, Linux implementation.
+ *
+ * Version : 0.2.1
+ *
+ * Using parts of the xiafs filesystem.
+ *
+ * History :
+ *
+ * 25-05-1998 by Richard Frowijn : first release.
+ * 21-06-1998 by Frank Denis : wrote qnx4_readpage to use generic_file_read.
+ * 27-06-1998 by Frank Denis : file overwriting.
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/time.h>
+#include <linux/qnx4_fs.h>
+
+/*
+ * We have mostly NULL's here: the current defaults are ok for
+ * the qnx4 filesystem.
+ */
+struct file_operations qnx4_file_operations =
+{
+	.llseek		= generic_file_llseek,
+	.read		= generic_file_read,
+	.mmap		= generic_file_mmap,
+	.sendfile	= generic_file_sendfile,
+#ifdef CONFIG_QNX4FS_RW
+	.write		= generic_file_write,
+	.fsync		= qnx4_sync_file,
+#endif
+};
+
+struct inode_operations qnx4_file_inode_operations =
+{
+#ifdef CONFIG_QNX4FS_RW
+	.truncate	= qnx4_truncate,
+#endif
+};
diff --git a/fs/qnx4/fsync.c b/fs/qnx4/fsync.c
new file mode 100644
index 00000000000..df5bc75d541
--- /dev/null
+++ b/fs/qnx4/fsync.c
@@ -0,0 +1,170 @@
+/* 
+ * QNX4 file system, Linux implementation.
+ * 
+ * Version : 0.1
+ * 
+ * Using parts of the xiafs filesystem.
+ * 
+ * History :
+ * 
+ * 24-03-1998 by Richard Frowijn : first release.
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/time.h>
+#include <linux/stat.h>
+#include <linux/fcntl.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+
+#include <linux/fs.h>
+#include <linux/qnx4_fs.h>
+
+#include <asm/system.h>
+
+/*
+ * The functions for qnx4 fs file synchronization.
+ */
+
+#ifdef CONFIG_QNX4FS_RW
+
+static int sync_block(struct inode *inode, unsigned short *block, int wait)
+{
+	struct buffer_head *bh;
+	unsigned short tmp;
+
+	if (!*block)
+		return 0;
+	tmp = *block;
+	bh = sb_find_get_block(inode->i_sb, *block);
+	if (!bh)
+		return 0;
+	if (*block != tmp) {
+		brelse(bh);
+		return 1;
+	}
+	if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
+		brelse(bh);
+		return -1;
+	}
+	if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) {
+		brelse(bh);
+		return 0;
+	}
+	ll_rw_block(WRITE, 1, &bh);
+	atomic_dec(&bh->b_count);
+	return 0;
+}
+
+#ifdef WTF
+static int sync_iblock(struct inode *inode, unsigned short *iblock,
+		       struct buffer_head **bh, int wait)
+{
+	int rc;
+	unsigned short tmp;
+
+	*bh = NULL;
+	tmp = *iblock;
+	if (!tmp)
+		return 0;
+	rc = sync_block(inode, iblock, wait);
+	if (rc)
+		return rc;
+	*bh = sb_bread(inode->i_sb, tmp);
+	if (tmp != *iblock) {
+		brelse(*bh);
+		*bh = NULL;
+		return 1;
+	}
+	if (!*bh)
+		return -1;
+	return 0;
+}
+#endif
+
+static int sync_direct(struct inode *inode, int wait)
+{
+	int i;
+	int rc, err = 0;
+
+	for (i = 0; i < 7; i++) {
+		rc = sync_block(inode,
+				(unsigned short *) qnx4_raw_inode(inode)->di_first_xtnt.xtnt_blk + i, wait);
+		if (rc > 0)
+			break;
+		if (rc)
+			err = rc;
+	}
+	return err;
+}
+
+#ifdef WTF
+static int sync_indirect(struct inode *inode, unsigned short *iblock, int wait)
+{
+	int i;
+	struct buffer_head *ind_bh;
+	int rc, err = 0;
+
+	rc = sync_iblock(inode, iblock, &ind_bh, wait);
+	if (rc || !ind_bh)
+		return rc;
+
+	for (i = 0; i < 512; i++) {
+		rc = sync_block(inode,
+				((unsigned short *) ind_bh->b_data) + i,
+				wait);
+		if (rc > 0)
+			break;
+		if (rc)
+			err = rc;
+	}
+	brelse(ind_bh);
+	return err;
+}
+
+static int sync_dindirect(struct inode *inode, unsigned short *diblock,
+			  int wait)
+{
+	int i;
+	struct buffer_head *dind_bh;
+	int rc, err = 0;
+
+	rc = sync_iblock(inode, diblock, &dind_bh, wait);
+	if (rc || !dind_bh)
+		return rc;
+
+	for (i = 0; i < 512; i++) {
+		rc = sync_indirect(inode,
+				((unsigned short *) dind_bh->b_data) + i,
+				   wait);
+		if (rc > 0)
+			break;
+		if (rc)
+			err = rc;
+	}
+	brelse(dind_bh);
+	return err;
+}
+#endif
+
+int qnx4_sync_file(struct file *file, struct dentry *dentry, int unused)
+{
+        struct inode *inode = dentry->d_inode;
+	int wait, err = 0;
+        
+        (void) file;
+	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
+	      S_ISLNK(inode->i_mode)))
+		return -EINVAL;
+
+	lock_kernel();
+	for (wait = 0; wait <= 1; wait++) {
+		err |= sync_direct(inode, wait);
+	}
+	err |= qnx4_sync_inode(inode);
+	unlock_kernel();
+	return (err < 0) ? -EIO : 0;
+}
+
+#endif
diff --git a/fs/qnx4/inode.c b/fs/qnx4/inode.c
new file mode 100644
index 00000000000..aa92d6b76a9
--- /dev/null
+++ b/fs/qnx4/inode.c
@@ -0,0 +1,603 @@
+/*
+ * QNX4 file system, Linux implementation.
+ *
+ * Version : 0.2.1
+ *
+ * Using parts of the xiafs filesystem.
+ *
+ * History :
+ *
+ * 01-06-1998 by Richard Frowijn : first release.
+ * 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc.
+ * 30-06-1998 by Frank Denis : first step to write inodes.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/qnx4_fs.h>
+#include <linux/init.h>
+#include <linux/highuid.h>
+#include <linux/smp_lock.h>
+#include <linux/pagemap.h>
+#include <linux/buffer_head.h>
+#include <linux/vfs.h>
+#include <asm/uaccess.h>
+
+#define QNX4_VERSION  4
+#define QNX4_BMNAME   ".bitmap"
+
+static struct super_operations qnx4_sops;
+
+#ifdef CONFIG_QNX4FS_RW
+
+int qnx4_sync_inode(struct inode *inode)
+{
+	int err = 0;
+# if 0
+	struct buffer_head *bh;
+
+   	bh = qnx4_update_inode(inode);
+	if (bh && buffer_dirty(bh))
+	{
+		sync_dirty_buffer(bh);
+		if (buffer_req(bh) && !buffer_uptodate(bh))
+		{
+			printk ("IO error syncing qnx4 inode [%s:%08lx]\n",
+				inode->i_sb->s_id, inode->i_ino);
+			err = -1;
+		}
+	        brelse (bh);
+	} else if (!bh) {
+		err = -1;
+	}
+# endif
+
+	return err;
+}
+
+static void qnx4_delete_inode(struct inode *inode)
+{
+	QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino));
+	inode->i_size = 0;
+	qnx4_truncate(inode);
+	lock_kernel();
+	qnx4_free_inode(inode);
+	unlock_kernel();
+}
+
+static void qnx4_write_super(struct super_block *sb)
+{
+	lock_kernel();
+	QNX4DEBUG(("qnx4: write_super\n"));
+	sb->s_dirt = 0;
+	unlock_kernel();
+}
+
+static int qnx4_write_inode(struct inode *inode, int unused)
+{
+	struct qnx4_inode_entry *raw_inode;
+	int block, ino;
+	struct buffer_head *bh;
+	ino = inode->i_ino;
+
+	QNX4DEBUG(("qnx4: write inode 1.\n"));
+	if (inode->i_nlink == 0) {
+		return 0;
+	}
+	if (!ino) {
+		printk("qnx4: bad inode number on dev %s: %d is out of range\n",
+		       inode->i_sb->s_id, ino);
+		return -EIO;
+	}
+	QNX4DEBUG(("qnx4: write inode 2.\n"));
+	block = ino / QNX4_INODES_PER_BLOCK;
+	lock_kernel();
+	if (!(bh = sb_bread(inode->i_sb, block))) {
+		printk("qnx4: major problem: unable to read inode from dev "
+		       "%s\n", inode->i_sb->s_id);
+		unlock_kernel();
+		return -EIO;
+	}
+	raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
+	    (ino % QNX4_INODES_PER_BLOCK);
+	raw_inode->di_mode  = cpu_to_le16(inode->i_mode);
+	raw_inode->di_uid   = cpu_to_le16(fs_high2lowuid(inode->i_uid));
+	raw_inode->di_gid   = cpu_to_le16(fs_high2lowgid(inode->i_gid));
+	raw_inode->di_nlink = cpu_to_le16(inode->i_nlink);
+	raw_inode->di_size  = cpu_to_le32(inode->i_size);
+	raw_inode->di_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
+	raw_inode->di_atime = cpu_to_le32(inode->i_atime.tv_sec);
+	raw_inode->di_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
+	raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks);
+	mark_buffer_dirty(bh);
+	brelse(bh);
+	unlock_kernel();
+	return 0;
+}
+
+#endif
+
+static void qnx4_put_super(struct super_block *sb);
+static struct inode *qnx4_alloc_inode(struct super_block *sb);
+static void qnx4_destroy_inode(struct inode *inode);
+static void qnx4_read_inode(struct inode *);
+static int qnx4_remount(struct super_block *sb, int *flags, char *data);
+static int qnx4_statfs(struct super_block *, struct kstatfs *);
+
+static struct super_operations qnx4_sops =
+{
+	.alloc_inode	= qnx4_alloc_inode,
+	.destroy_inode	= qnx4_destroy_inode,
+	.read_inode	= qnx4_read_inode,
+	.put_super	= qnx4_put_super,
+	.statfs		= qnx4_statfs,
+	.remount_fs	= qnx4_remount,
+#ifdef CONFIG_QNX4FS_RW
+	.write_inode	= qnx4_write_inode,
+	.delete_inode	= qnx4_delete_inode,
+	.write_super	= qnx4_write_super,
+#endif
+};
+
+static int qnx4_remount(struct super_block *sb, int *flags, char *data)
+{
+	struct qnx4_sb_info *qs;
+
+	qs = qnx4_sb(sb);
+	qs->Version = QNX4_VERSION;
+#ifndef CONFIG_QNX4FS_RW
+	*flags |= MS_RDONLY;
+#endif
+	if (*flags & MS_RDONLY) {
+		return 0;
+	}
+
+	mark_buffer_dirty(qs->sb_buf);
+
+	return 0;
+}
+
+static struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
+				       int create)
+{
+	struct buffer_head *result = NULL;
+
+	if ( nr >= 0 )
+		nr = qnx4_block_map( inode, nr );
+	if (nr) {
+		result = sb_getblk(inode->i_sb, nr);
+		return result;
+	}
+	if (!create) {
+		return NULL;
+	}
+#if 0
+	tmp = qnx4_new_block(inode->i_sb);
+	if (!tmp) {
+		return NULL;
+	}
+	result = sb_getblk(inode->i_sb, tmp);
+	if (tst) {
+		qnx4_free_block(inode->i_sb, tmp);
+		brelse(result);
+		goto repeat;
+	}
+	tst = tmp;
+#endif
+	inode->i_ctime = CURRENT_TIME_SEC;
+	mark_inode_dirty(inode);
+	return result;
+}
+
+struct buffer_head *qnx4_bread(struct inode *inode, int block, int create)
+{
+	struct buffer_head *bh;
+
+	bh = qnx4_getblk(inode, block, create);
+	if (!bh || buffer_uptodate(bh)) {
+		return bh;
+	}
+	ll_rw_block(READ, 1, &bh);
+	wait_on_buffer(bh);
+	if (buffer_uptodate(bh)) {
+		return bh;
+	}
+	brelse(bh);
+
+	return NULL;
+}
+
+static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
+{
+	unsigned long phys;
+
+	QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
+
+	phys = qnx4_block_map( inode, iblock );
+	if ( phys ) {
+		// logical block is before EOF
+		map_bh(bh, inode->i_sb, phys);
+	} else if ( create ) {
+		// to be done.
+	}
+	return 0;
+}
+
+unsigned long qnx4_block_map( struct inode *inode, long iblock )
+{
+	int ix;
+	long offset, i_xblk;
+	unsigned long block = 0;
+	struct buffer_head *bh = NULL;
+	struct qnx4_xblk *xblk = NULL;
+	struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
+	qnx4_nxtnt_t nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
+
+	if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) {
+		// iblock is in the first extent. This is easy.
+		block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1;
+	} else {
+		// iblock is beyond first extent. We have to follow the extent chain.
+		i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
+		offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size);
+		ix = 0;
+		while ( --nxtnt > 0 ) {
+			if ( ix == 0 ) {
+				// read next xtnt block.
+				bh = sb_bread(inode->i_sb, i_xblk - 1);
+				if ( !bh ) {
+					QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
+					return -EIO;
+				}
+				xblk = (struct qnx4_xblk*)bh->b_data;
+				if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
+					QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
+					return -EIO;
+				}
+			}
+			if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
+				// got it!
+				block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
+				break;
+			}
+			offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
+			if ( ++ix >= xblk->xblk_num_xtnts ) {
+				i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
+				ix = 0;
+				brelse( bh );
+				bh = NULL;
+			}
+		}
+		if ( bh )
+			brelse( bh );
+	}
+
+	QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
+	return block;
+}
+
+static int qnx4_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+	lock_kernel();
+
+	buf->f_type    = sb->s_magic;
+	buf->f_bsize   = sb->s_blocksize;
+	buf->f_blocks  = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
+	buf->f_bfree   = qnx4_count_free_blocks(sb);
+	buf->f_bavail  = buf->f_bfree;
+	buf->f_namelen = QNX4_NAME_MAX;
+
+	unlock_kernel();
+
+	return 0;
+}
+
+/*
+ * Check the root directory of the filesystem to make sure
+ * it really _is_ a qnx4 filesystem, and to check the size
+ * of the directory entry.
+ */
+static const char *qnx4_checkroot(struct super_block *sb)
+{
+	struct buffer_head *bh;
+	struct qnx4_inode_entry *rootdir;
+	int rd, rl;
+	int i, j;
+	int found = 0;
+
+	if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') {
+		return "no qnx4 filesystem (no root dir).";
+	} else {
+		QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", sb->s_id));
+		rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
+		rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size);
+		for (j = 0; j < rl; j++) {
+			bh = sb_bread(sb, rd + j);	/* root dir, first block */
+			if (bh == NULL) {
+				return "unable to read root entry.";
+			}
+			for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
+				rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE);
+				if (rootdir->di_fname != NULL) {
+					QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname));
+					if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {
+						found = 1;
+						qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
+						if (!qnx4_sb(sb)->BitMap) {
+							brelse (bh);
+							return "not enough memory for bitmap inode";
+						}
+						memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) );	/* keep bitmap inode known */
+						break;
+					}
+				}
+			}
+			brelse(bh);
+			if (found != 0) {
+				break;
+			}
+		}
+		if (found == 0) {
+			return "bitmap file not found.";
+		}
+	}
+	return NULL;
+}
+
+static int qnx4_fill_super(struct super_block *s, void *data, int silent)
+{
+	struct buffer_head *bh;
+	struct inode *root;
+	const char *errmsg;
+	struct qnx4_sb_info *qs;
+
+	qs = kmalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
+	if (!qs)
+		return -ENOMEM;
+	s->s_fs_info = qs;
+	memset(qs, 0, sizeof(struct qnx4_sb_info));
+
+	sb_set_blocksize(s, QNX4_BLOCK_SIZE);
+
+	/* Check the superblock signature. Since the qnx4 code is
+	   dangerous, we should leave as quickly as possible
+	   if we don't belong here... */
+	bh = sb_bread(s, 1);
+	if (!bh) {
+		printk("qnx4: unable to read the superblock\n");
+		goto outnobh;
+	}
+	if ( le32_to_cpu( *(__u32*)bh->b_data ) != QNX4_SUPER_MAGIC ) {
+		if (!silent)
+			printk("qnx4: wrong fsid in superblock.\n");
+		goto out;
+	}
+	s->s_op = &qnx4_sops;
+	s->s_magic = QNX4_SUPER_MAGIC;
+#ifndef CONFIG_QNX4FS_RW
+	s->s_flags |= MS_RDONLY;	/* Yup, read-only yet */
+#endif
+	qnx4_sb(s)->sb_buf = bh;
+	qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
+
+
+ 	/* check before allocating dentries, inodes, .. */
+	errmsg = qnx4_checkroot(s);
+	if (errmsg != NULL) {
+ 		if (!silent)
+ 			printk("qnx4: %s\n", errmsg);
+		goto out;
+	}
+
+ 	/* does root not have inode number QNX4_ROOT_INO ?? */
+ 	root = iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
+ 	if (!root) {
+ 		printk("qnx4: get inode failed\n");
+ 		goto out;
+ 	}
+
+ 	s->s_root = d_alloc_root(root);
+ 	if (s->s_root == NULL)
+ 		goto outi;
+
+	brelse(bh);
+
+	return 0;
+
+      outi:
+	iput(root);
+      out:
+	brelse(bh);
+      outnobh:
+	kfree(qs);
+	s->s_fs_info = NULL;
+	return -EINVAL;
+}
+
+static void qnx4_put_super(struct super_block *sb)
+{
+	struct qnx4_sb_info *qs = qnx4_sb(sb);
+	kfree( qs->BitMap );
+	kfree( qs );
+	sb->s_fs_info = NULL;
+	return;
+}
+
+static int qnx4_writepage(struct page *page, struct writeback_control *wbc)
+{
+	return block_write_full_page(page,qnx4_get_block, wbc);
+}
+static int qnx4_readpage(struct file *file, struct page *page)
+{
+	return block_read_full_page(page,qnx4_get_block);
+}
+static int qnx4_prepare_write(struct file *file, struct page *page,
+			      unsigned from, unsigned to)
+{
+	struct qnx4_inode_info *qnx4_inode = qnx4_i(page->mapping->host);
+	return cont_prepare_write(page, from, to, qnx4_get_block,
+				  &qnx4_inode->mmu_private);
+}
+static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
+{
+	return generic_block_bmap(mapping,block,qnx4_get_block);
+}
+static struct address_space_operations qnx4_aops = {
+	.readpage	= qnx4_readpage,
+	.writepage	= qnx4_writepage,
+	.sync_page	= block_sync_page,
+	.prepare_write	= qnx4_prepare_write,
+	.commit_write	= generic_commit_write,
+	.bmap		= qnx4_bmap
+};
+
+static void qnx4_read_inode(struct inode *inode)
+{
+	struct buffer_head *bh;
+	struct qnx4_inode_entry *raw_inode;
+	int block, ino;
+	struct super_block *sb = inode->i_sb;
+	struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
+
+	ino = inode->i_ino;
+	inode->i_mode = 0;
+
+	QNX4DEBUG(("Reading inode : [%d]\n", ino));
+	if (!ino) {
+		printk("qnx4: bad inode number on dev %s: %d is out of range\n",
+		       sb->s_id, ino);
+		return;
+	}
+	block = ino / QNX4_INODES_PER_BLOCK;
+
+	if (!(bh = sb_bread(sb, block))) {
+		printk("qnx4: major problem: unable to read inode from dev "
+		       "%s\n", sb->s_id);
+		return;
+	}
+	raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
+	    (ino % QNX4_INODES_PER_BLOCK);
+
+	inode->i_mode    = le16_to_cpu(raw_inode->di_mode);
+	inode->i_uid     = (uid_t)le16_to_cpu(raw_inode->di_uid);
+	inode->i_gid     = (gid_t)le16_to_cpu(raw_inode->di_gid);
+	inode->i_nlink   = le16_to_cpu(raw_inode->di_nlink);
+	inode->i_size    = le32_to_cpu(raw_inode->di_size);
+	inode->i_mtime.tv_sec   = le32_to_cpu(raw_inode->di_mtime);
+	inode->i_mtime.tv_nsec = 0;
+	inode->i_atime.tv_sec   = le32_to_cpu(raw_inode->di_atime);
+	inode->i_atime.tv_nsec = 0;
+	inode->i_ctime.tv_sec   = le32_to_cpu(raw_inode->di_ctime);
+	inode->i_ctime.tv_nsec = 0;
+	inode->i_blocks  = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
+	inode->i_blksize = QNX4_DIR_ENTRY_SIZE;
+
+	memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
+	if (S_ISREG(inode->i_mode)) {
+		inode->i_op = &qnx4_file_inode_operations;
+		inode->i_fop = &qnx4_file_operations;
+		inode->i_mapping->a_ops = &qnx4_aops;
+		qnx4_i(inode)->mmu_private = inode->i_size;
+	} else if (S_ISDIR(inode->i_mode)) {
+		inode->i_op = &qnx4_dir_inode_operations;
+		inode->i_fop = &qnx4_dir_operations;
+	} else if (S_ISLNK(inode->i_mode)) {
+		inode->i_op = &page_symlink_inode_operations;
+		inode->i_mapping->a_ops = &qnx4_aops;
+		qnx4_i(inode)->mmu_private = inode->i_size;
+	} else
+		printk("qnx4: bad inode %d on dev %s\n",ino,sb->s_id);
+	brelse(bh);
+}
+
+static kmem_cache_t *qnx4_inode_cachep;
+
+static struct inode *qnx4_alloc_inode(struct super_block *sb)
+{
+	struct qnx4_inode_info *ei;
+	ei = kmem_cache_alloc(qnx4_inode_cachep, SLAB_KERNEL);
+	if (!ei)
+		return NULL;
+	return &ei->vfs_inode;
+}
+
+static void qnx4_destroy_inode(struct inode *inode)
+{
+	kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
+}
+
+static void init_once(void *foo, kmem_cache_t * cachep,
+		      unsigned long flags)
+{
+	struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
+
+	if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
+	    SLAB_CTOR_CONSTRUCTOR)
+		inode_init_once(&ei->vfs_inode);
+}
+
+static int init_inodecache(void)
+{
+	qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
+					     sizeof(struct qnx4_inode_info),
+					     0, SLAB_RECLAIM_ACCOUNT,
+					     init_once, NULL);
+	if (qnx4_inode_cachep == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+static void destroy_inodecache(void)
+{
+	if (kmem_cache_destroy(qnx4_inode_cachep))
+		printk(KERN_INFO
+		       "qnx4_inode_cache: not all structures were freed\n");
+}
+
+static struct super_block *qnx4_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
+}
+
+static struct file_system_type qnx4_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "qnx4",
+	.get_sb		= qnx4_get_sb,
+	.kill_sb	= kill_block_super,
+	.fs_flags	= FS_REQUIRES_DEV,
+};
+
+static int __init init_qnx4_fs(void)
+{
+	int err;
+
+	err = init_inodecache();
+	if (err)
+		return err;
+
+	err = register_filesystem(&qnx4_fs_type);
+	if (err) {
+		destroy_inodecache();
+		return err;
+	}
+
+	printk("QNX4 filesystem 0.2.3 registered.\n");
+	return 0;
+}
+
+static void __exit exit_qnx4_fs(void)
+{
+	unregister_filesystem(&qnx4_fs_type);
+	destroy_inodecache();
+}
+
+module_init(init_qnx4_fs)
+module_exit(exit_qnx4_fs)
+MODULE_LICENSE("GPL");
+
diff --git a/fs/qnx4/namei.c b/fs/qnx4/namei.c
new file mode 100644
index 00000000000..4af4951d7f5
--- /dev/null
+++ b/fs/qnx4/namei.c
@@ -0,0 +1,249 @@
+/* 
+ * QNX4 file system, Linux implementation.
+ * 
+ * Version : 0.2.1
+ * 
+ * Using parts of the xiafs filesystem.
+ * 
+ * History :
+ * 
+ * 01-06-1998 by Richard Frowijn : first release.
+ * 21-06-1998 by Frank Denis : dcache support, fixed error codes.
+ * 04-07-1998 by Frank Denis : first step for rmdir/unlink.
+ */
+
+#include <linux/config.h>
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/qnx4_fs.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+#include <linux/fcntl.h>
+#include <linux/errno.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+
+
+/*
+ * check if the filename is correct. For some obscure reason, qnx writes a
+ * new file twice in the directory entry, first with all possible options at 0
+ * and for a second time the way it is, they want us not to access the qnx
+ * filesystem when whe are using linux.
+ */
+static int qnx4_match(int len, const char *name,
+		      struct buffer_head *bh, unsigned long *offset)
+{
+	struct qnx4_inode_entry *de;
+	int namelen, thislen;
+
+	if (bh == NULL) {
+		printk("qnx4: matching unassigned buffer !\n");
+		return 0;
+	}
+	de = (struct qnx4_inode_entry *) (bh->b_data + *offset);
+	*offset += QNX4_DIR_ENTRY_SIZE;
+	if ((de->di_status & QNX4_FILE_LINK) != 0) {
+		namelen = QNX4_NAME_MAX;
+	} else {
+		namelen = QNX4_SHORT_NAME_MAX;
+	}
+	/* "" means "." ---> so paths like "/usr/lib//libc.a" work */
+	if (!len && (de->di_fname[0] == '.') && (de->di_fname[1] == '\0')) {
+		return 1;
+	}
+	thislen = strlen( de->di_fname );
+	if ( thislen > namelen )
+		thislen = namelen;
+	if (len != thislen) {
+		return 0;
+	}
+	if (strncmp(name, de->di_fname, len) == 0) {
+		if ((de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK)) != 0) {
+			return 1;
+		}
+	}
+	return 0;
+}
+
+static struct buffer_head *qnx4_find_entry(int len, struct inode *dir,
+	   const char *name, struct qnx4_inode_entry **res_dir, int *ino)
+{
+	unsigned long block, offset, blkofs;
+	struct buffer_head *bh;
+
+	*res_dir = NULL;
+	if (!dir->i_sb) {
+		printk("qnx4: no superblock on dir.\n");
+		return NULL;
+	}
+	bh = NULL;
+	block = offset = blkofs = 0;
+	while (blkofs * QNX4_BLOCK_SIZE + offset < dir->i_size) {
+		if (!bh) {
+			bh = qnx4_bread(dir, blkofs, 0);
+			if (!bh) {
+				blkofs++;
+				continue;
+			}
+		}
+		*res_dir = (struct qnx4_inode_entry *) (bh->b_data + offset);
+		if (qnx4_match(len, name, bh, &offset)) {
+			block = qnx4_block_map( dir, blkofs );
+			*ino = block * QNX4_INODES_PER_BLOCK +
+			    (offset / QNX4_DIR_ENTRY_SIZE) - 1;
+			return bh;
+		}
+		if (offset < bh->b_size) {
+			continue;
+		}
+		brelse(bh);
+		bh = NULL;
+		offset = 0;
+		blkofs++;
+	}
+	brelse(bh);
+	*res_dir = NULL;
+	return NULL;
+}
+
+struct dentry * qnx4_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
+{
+	int ino;
+	struct qnx4_inode_entry *de;
+	struct qnx4_link_info *lnk;
+	struct buffer_head *bh;
+	const char *name = dentry->d_name.name;
+	int len = dentry->d_name.len;
+	struct inode *foundinode = NULL;
+
+	lock_kernel();
+	if (!(bh = qnx4_find_entry(len, dir, name, &de, &ino)))
+		goto out;
+	/* The entry is linked, let's get the real info */
+	if ((de->di_status & QNX4_FILE_LINK) == QNX4_FILE_LINK) {
+		lnk = (struct qnx4_link_info *) de;
+		ino = (le32_to_cpu(lnk->dl_inode_blk) - 1) *
+                    QNX4_INODES_PER_BLOCK +
+		    lnk->dl_inode_ndx;
+	}
+	brelse(bh);
+
+	if ((foundinode = iget(dir->i_sb, ino)) == NULL) {
+		unlock_kernel();
+		QNX4DEBUG(("qnx4: lookup->iget -> NULL\n"));
+		return ERR_PTR(-EACCES);
+	}
+out:
+	unlock_kernel();
+	d_add(dentry, foundinode);
+
+	return NULL;
+}
+
+#ifdef CONFIG_QNX4FS_RW
+int qnx4_create(struct inode *dir, struct dentry *dentry, int mode,
+		struct nameidata *nd)
+{
+	QNX4DEBUG(("qnx4: qnx4_create\n"));
+	if (dir == NULL) {
+		return -ENOENT;
+	}
+	return -ENOSPC;
+}
+
+int qnx4_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	struct buffer_head *bh;
+	struct qnx4_inode_entry *de;
+	struct inode *inode;
+	int retval;
+	int ino;
+
+	QNX4DEBUG(("qnx4: qnx4_rmdir [%s]\n", dentry->d_name.name));
+	lock_kernel();
+	bh = qnx4_find_entry(dentry->d_name.len, dir, dentry->d_name.name,
+			     &de, &ino);
+	if (bh == NULL) {
+		unlock_kernel();
+		return -ENOENT;
+	}
+	inode = dentry->d_inode;
+	if (inode->i_ino != ino) {
+		retval = -EIO;
+		goto end_rmdir;
+	}
+#if 0
+	if (!empty_dir(inode)) {
+		retval = -ENOTEMPTY;
+		goto end_rmdir;
+	}
+#endif
+	if (inode->i_nlink != 2) {
+		QNX4DEBUG(("empty directory has nlink!=2 (%d)\n", inode->i_nlink));
+	}
+	QNX4DEBUG(("qnx4: deleting directory\n"));
+	de->di_status = 0;
+	memset(de->di_fname, 0, sizeof de->di_fname);
+	de->di_mode = 0;
+	mark_buffer_dirty(bh);
+	inode->i_nlink = 0;
+	mark_inode_dirty(inode);
+	inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
+	dir->i_nlink--;
+	mark_inode_dirty(dir);
+	retval = 0;
+
+      end_rmdir:
+	brelse(bh);
+
+	unlock_kernel();
+	return retval;
+}
+
+int qnx4_unlink(struct inode *dir, struct dentry *dentry)
+{
+	struct buffer_head *bh;
+	struct qnx4_inode_entry *de;
+	struct inode *inode;
+	int retval;
+	int ino;
+
+	QNX4DEBUG(("qnx4: qnx4_unlink [%s]\n", dentry->d_name.name));
+	lock_kernel();
+	bh = qnx4_find_entry(dentry->d_name.len, dir, dentry->d_name.name,
+			     &de, &ino);
+	if (bh == NULL) {
+		unlock_kernel();
+		return -ENOENT;
+	}
+	inode = dentry->d_inode;
+	if (inode->i_ino != ino) {
+		retval = -EIO;
+		goto end_unlink;
+	}
+	retval = -EPERM;
+	if (!inode->i_nlink) {
+		QNX4DEBUG(("Deleting nonexistent file (%s:%lu), %d\n",
+			   inode->i_sb->s_id,
+			   inode->i_ino, inode->i_nlink));
+		inode->i_nlink = 1;
+	}
+	de->di_status = 0;
+	memset(de->di_fname, 0, sizeof de->di_fname);
+	de->di_mode = 0;
+	mark_buffer_dirty(bh);
+	dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
+	mark_inode_dirty(dir);
+	inode->i_nlink--;
+	inode->i_ctime = dir->i_ctime;
+	mark_inode_dirty(inode);
+	retval = 0;
+
+end_unlink:
+	unlock_kernel();
+	brelse(bh);
+
+	return retval;
+}
+#endif
diff --git a/fs/qnx4/truncate.c b/fs/qnx4/truncate.c
new file mode 100644
index 00000000000..86563ec01b3
--- /dev/null
+++ b/fs/qnx4/truncate.c
@@ -0,0 +1,39 @@
+/* 
+ * QNX4 file system, Linux implementation.
+ * 
+ * Version : 0.1
+ * 
+ * Using parts of the xiafs filesystem.
+ * 
+ * History :
+ * 
+ * 30-06-1998 by Frank DENIS : ugly filler.
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/qnx4_fs.h>
+#include <linux/smp_lock.h>
+#include <asm/uaccess.h>
+
+#ifdef CONFIG_QNX4FS_RW
+
+void qnx4_truncate(struct inode *inode)
+{
+	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
+	      S_ISLNK(inode->i_mode))) {
+		return;
+	}
+	lock_kernel();
+	if (!(S_ISDIR(inode->i_mode))) {
+		/* TODO */
+	}
+	QNX4DEBUG(("qnx4: qnx4_truncate called\n"));
+	inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
+	mark_inode_dirty(inode);
+	unlock_kernel();
+}
+
+#endif