[linux-2.6-block.git] / fs / qnx4 / inode.c

/*
 * 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/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 const 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));
	truncate_inode_pages(&inode->i_data, 0);
	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 int qnx4_remount(struct super_block *sb, int *flags, char *data);
static int qnx4_statfs(struct dentry *, struct kstatfs *);

static const struct super_operations qnx4_sops =
{
	.alloc_inode	= qnx4_alloc_inode,
	.destroy_inode	= qnx4_destroy_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);
	u16 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 dentry *dentry, struct kstatfs *buf)
{
	struct super_block *sb = dentry->d_sb;

	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;
	int ret = -EINVAL;

	qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
	if (!qs)
		return -ENOMEM;
	s->s_fs_info = qs;

	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_cpup((__le32*) 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 = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
	if (IS_ERR(root)) {
 		printk("qnx4: get inode failed\n");
		ret = PTR_ERR(root);
 		goto out;
 	}

	ret = -ENOMEM;
 	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 ret;
}

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_write_begin(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata)
{
	struct qnx4_inode_info *qnx4_inode = qnx4_i(mapping->host);
	*pagep = NULL;
	return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
				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 const struct address_space_operations qnx4_aops = {
	.readpage	= qnx4_readpage,
	.writepage	= qnx4_writepage,
	.sync_page	= block_sync_page,
	.write_begin	= qnx4_write_begin,
	.write_end	= generic_write_end,
	.bmap		= qnx4_bmap
};

struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
{
	struct buffer_head *bh;
	struct qnx4_inode_entry *raw_inode;
	int block;
	struct qnx4_inode_entry *qnx4_inode;
	struct inode *inode;

	inode = iget_locked(sb, ino);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
		return inode;

	qnx4_inode = qnx4_raw_inode(inode);
	inode->i_mode = 0;

	QNX4DEBUG(("Reading inode : [%d]\n", ino));
	if (!ino) {
		printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
				"out of range\n",
		       sb->s_id, ino);
		iget_failed(inode);
		return ERR_PTR(-EIO);
	}
	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);
		iget_failed(inode);
		return ERR_PTR(-EIO);
	}
	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);

	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(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
			ino, sb->s_id);
		iget_failed(inode);
		brelse(bh);
		return ERR_PTR(-EIO);
	}
	brelse(bh);
	unlock_new_inode(inode);
	return inode;
}

static struct kmem_cache *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, GFP_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)
{
	struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;

	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|
						SLAB_MEM_SPREAD),
					     init_once);
	if (qnx4_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
	kmem_cache_destroy(qnx4_inode_cachep);
}

static int qnx4_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, qnx4_fill_super,
			   mnt);
}

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");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* QNX4 file system, Linux implementation.
	3	*
	4	* Version : 0.2.1
	5	*
	6	* Using parts of the xiafs filesystem.
	7	*
	8	* History :
	9	*
	10	* 01-06-1998 by Richard Frowijn : first release.
	11	* 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc.
	12	* 30-06-1998 by Frank Denis : first step to write inodes.
	13	*/
	14
1da177e4 LT	15	#include <linux/module.h>
	16	#include <linux/types.h>
	17	#include <linux/string.h>
	18	#include <linux/errno.h>
	19	#include <linux/slab.h>
	20	#include <linux/fs.h>
	21	#include <linux/qnx4_fs.h>
	22	#include <linux/init.h>
	23	#include <linux/highuid.h>
	24	#include <linux/smp_lock.h>
	25	#include <linux/pagemap.h>
	26	#include <linux/buffer_head.h>
	27	#include <linux/vfs.h>
	28	#include <asm/uaccess.h>
	29
	30	#define QNX4_VERSION 4
	31	#define QNX4_BMNAME ".bitmap"
	32
ee9b6d61	33	static const struct super_operations qnx4_sops;
1da177e4 LT	34
	35	#ifdef CONFIG_QNX4FS_RW
	36
	37	int qnx4_sync_inode(struct inode *inode)
	38	{
	39	int err = 0;
	40	# if 0
	41	struct buffer_head *bh;
	42
	43	bh = qnx4_update_inode(inode);
	44	if (bh && buffer_dirty(bh))
	45	{
	46	sync_dirty_buffer(bh);
	47	if (buffer_req(bh) && !buffer_uptodate(bh))
	48	{
	49	printk ("IO error syncing qnx4 inode [%s:%08lx]\n",
	50	inode->i_sb->s_id, inode->i_ino);
	51	err = -1;
	52	}
	53	brelse (bh);
	54	} else if (!bh) {
	55	err = -1;
	56	}
	57	# endif
	58
	59	return err;
	60	}
	61
	62	static void qnx4_delete_inode(struct inode *inode)
	63	{
	64	QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino));
fef26658	65	truncate_inode_pages(&inode->i_data, 0);
1da177e4 LT	66	inode->i_size = 0;
	67	qnx4_truncate(inode);
	68	lock_kernel();
	69	qnx4_free_inode(inode);
	70	unlock_kernel();
	71	}
	72
	73	static void qnx4_write_super(struct super_block *sb)
	74	{
	75	lock_kernel();
	76	QNX4DEBUG(("qnx4: write_super\n"));
	77	sb->s_dirt = 0;
	78	unlock_kernel();
	79	}
	80
	81	static int qnx4_write_inode(struct inode *inode, int unused)
	82	{
	83	struct qnx4_inode_entry *raw_inode;
	84	int block, ino;
	85	struct buffer_head *bh;
	86	ino = inode->i_ino;
	87
	88	QNX4DEBUG(("qnx4: write inode 1.\n"));
	89	if (inode->i_nlink == 0) {
	90	return 0;
	91	}
	92	if (!ino) {
	93	printk("qnx4: bad inode number on dev %s: %d is out of range\n",
	94	inode->i_sb->s_id, ino);
	95	return -EIO;
	96	}
	97	QNX4DEBUG(("qnx4: write inode 2.\n"));
	98	block = ino / QNX4_INODES_PER_BLOCK;
	99	lock_kernel();
	100	if (!(bh = sb_bread(inode->i_sb, block))) {
	101	printk("qnx4: major problem: unable to read inode from dev "
	102	"%s\n", inode->i_sb->s_id);
	103	unlock_kernel();
	104	return -EIO;
	105	}
	106	raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
	107	(ino % QNX4_INODES_PER_BLOCK);
	108	raw_inode->di_mode = cpu_to_le16(inode->i_mode);
	109	raw_inode->di_uid = cpu_to_le16(fs_high2lowuid(inode->i_uid));
	110	raw_inode->di_gid = cpu_to_le16(fs_high2lowgid(inode->i_gid));
	111	raw_inode->di_nlink = cpu_to_le16(inode->i_nlink);
	112	raw_inode->di_size = cpu_to_le32(inode->i_size);
	113	raw_inode->di_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
	114	raw_inode->di_atime = cpu_to_le32(inode->i_atime.tv_sec);
	115	raw_inode->di_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
	116	raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks);
	117	mark_buffer_dirty(bh);
	118	brelse(bh);
	119	unlock_kernel();
	120	return 0;
	121	}
	122
	123	#endif
	124
	125	static void qnx4_put_super(struct super_block *sb);
	126	static struct inode qnx4_alloc_inode(struct super_block sb);
	127	static void qnx4_destroy_inode(struct inode *inode);
1da177e4	128	static int qnx4_remount(struct super_block sb, int flags, char *data);
726c3342	129	static int qnx4_statfs(struct dentry , struct kstatfs );
1da177e4	130
ee9b6d61	131	static const struct super_operations qnx4_sops =
1da177e4 LT	132	{
	133	.alloc_inode = qnx4_alloc_inode,
	134	.destroy_inode = qnx4_destroy_inode,
1da177e4 LT	135	.put_super = qnx4_put_super,
	136	.statfs = qnx4_statfs,
	137	.remount_fs = qnx4_remount,
	138	#ifdef CONFIG_QNX4FS_RW
	139	.write_inode = qnx4_write_inode,
	140	.delete_inode = qnx4_delete_inode,
	141	.write_super = qnx4_write_super,
	142	#endif
	143	};
	144
	145	static int qnx4_remount(struct super_block sb, int flags, char *data)
	146	{
	147	struct qnx4_sb_info *qs;
	148
	149	qs = qnx4_sb(sb);
	150	qs->Version = QNX4_VERSION;
	151	#ifndef CONFIG_QNX4FS_RW
	152	*flags \|= MS_RDONLY;
	153	#endif
	154	if (*flags & MS_RDONLY) {
	155	return 0;
	156	}
	157
	158	mark_buffer_dirty(qs->sb_buf);
	159
	160	return 0;
	161	}
	162
	163	static struct buffer_head qnx4_getblk(struct inode inode, int nr,
	164	int create)
	165	{
	166	struct buffer_head *result = NULL;
	167
	168	if ( nr >= 0 )
	169	nr = qnx4_block_map( inode, nr );
	170	if (nr) {
	171	result = sb_getblk(inode->i_sb, nr);
	172	return result;
	173	}
	174	if (!create) {
	175	return NULL;
	176	}
	177	#if 0
	178	tmp = qnx4_new_block(inode->i_sb);
	179	if (!tmp) {
	180	return NULL;
	181	}
	182	result = sb_getblk(inode->i_sb, tmp);
	183	if (tst) {
	184	qnx4_free_block(inode->i_sb, tmp);
	185	brelse(result);
	186	goto repeat;
	187	}
	188	tst = tmp;
	189	#endif
	190	inode->i_ctime = CURRENT_TIME_SEC;
	191	mark_inode_dirty(inode);
	192	return result;
	193	}
	194
	195	struct buffer_head qnx4_bread(struct inode inode, int block, int create)
	196	{
	197	struct buffer_head *bh;
	198
199	bh = qnx4_getblk(inode, block, create);
200	if (!bh \|\| buffer_uptodate(bh)) {
201	return bh;
202	}
203	ll_rw_block(READ, 1, &bh);
204	wait_on_buffer(bh);
205	if (buffer_uptodate(bh)) {
206	return bh;
207	}
208	brelse(bh);
209
210	return NULL;
211	}
212
213	static int qnx4_get_block( struct inode inode, sector_t iblock, struct buffer_head bh, int create )
214	{
215	unsigned long phys;
216
217	QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
218
219	phys = qnx4_block_map( inode, iblock );
220	if ( phys ) {
221	// logical block is before EOF
222	map_bh(bh, inode->i_sb, phys);
223	} else if ( create ) {
224	// to be done.
225	}
226	return 0;
227	}
228
229	unsigned long qnx4_block_map( struct inode *inode, long iblock )
230	{
231	int ix;
232	long offset, i_xblk;
233	unsigned long block = 0;
234	struct buffer_head *bh = NULL;
235	struct qnx4_xblk *xblk = NULL;
236	struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
75043cb5	237	u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
1da177e4 LT	238
	239	if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) {
	240	// iblock is in the first extent. This is easy.
	241	block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1;
	242	} else {
	243	// iblock is beyond first extent. We have to follow the extent chain.
	244	i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
	245	offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size);
	246	ix = 0;
	247	while ( --nxtnt > 0 ) {
	248	if ( ix == 0 ) {
	249	// read next xtnt block.
	250	bh = sb_bread(inode->i_sb, i_xblk - 1);
	251	if ( !bh ) {
	252	QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
	253	return -EIO;
	254	}
	255	xblk = (struct qnx4_xblk*)bh->b_data;
	256	if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
	257	QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
	258	return -EIO;
	259	}
	260	}
	261	if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
	262	// got it!
	263	block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
	264	break;
	265	}
	266	offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
	267	if ( ++ix >= xblk->xblk_num_xtnts ) {
	268	i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
	269	ix = 0;
	270	brelse( bh );
	271	bh = NULL;
	272	}
	273	}
	274	if ( bh )
	275	brelse( bh );
	276	}
	277
	278	QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
	279	return block;
	280	}
	281
726c3342	282	static int qnx4_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	283	{
726c3342 DH	284	struct super_block *sb = dentry->d_sb;
726c3342 DH	285
1da177e4 LT	286	lock_kernel();
	287
	288	buf->f_type = sb->s_magic;
	289	buf->f_bsize = sb->s_blocksize;
	290	buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
	291	buf->f_bfree = qnx4_count_free_blocks(sb);
	292	buf->f_bavail = buf->f_bfree;
	293	buf->f_namelen = QNX4_NAME_MAX;
	294
	295	unlock_kernel();
	296
	297	return 0;
	298	}
	299
	300	/*
	301	* Check the root directory of the filesystem to make sure
	302	* it really _is_ a qnx4 filesystem, and to check the size
	303	* of the directory entry.
	304	*/
	305	static const char qnx4_checkroot(struct super_block sb)
	306	{
	307	struct buffer_head *bh;
	308	struct qnx4_inode_entry *rootdir;
	309	int rd, rl;
	310	int i, j;
	311	int found = 0;
	312
	313	if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') {
	314	return "no qnx4 filesystem (no root dir).";
	315	} else {
	316	QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", sb->s_id));
	317	rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
	318	rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size);
	319	for (j = 0; j < rl; j++) {
	320	bh = sb_bread(sb, rd + j); /* root dir, first block */
	321	if (bh == NULL) {
	322	return "unable to read root entry.";
	323	}
	324	for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
	325	rootdir = (struct qnx4_inode_entry ) (bh->b_data + i QNX4_DIR_ENTRY_SIZE);
	326	if (rootdir->di_fname != NULL) {
	327	QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname));
	328	if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {
	329	found = 1;
	330	qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
	331	if (!qnx4_sb(sb)->BitMap) {
	332	brelse (bh);
	333	return "not enough memory for bitmap inode";
	334	}
	335	memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) ); /* keep bitmap inode known */
	336	break;
	337	}
	338	}
	339	}
	340	brelse(bh);
	341	if (found != 0) {
	342	break;
	343	}
	344	}
	345	if (found == 0) {
	346	return "bitmap file not found.";
	347	}
	348	}
	349	return NULL;
350	}
351
352	static int qnx4_fill_super(struct super_block s, void data, int silent)
353	{
354	struct buffer_head *bh;
355	struct inode *root;
356	const char *errmsg;
357	struct qnx4_sb_info *qs;
2b7e5bcb	358	int ret = -EINVAL;
1da177e4	359
f8314dc6	360	qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
1da177e4 LT	361	if (!qs)
	362	return -ENOMEM;
	363	s->s_fs_info = qs;
1da177e4 LT	364
	365	sb_set_blocksize(s, QNX4_BLOCK_SIZE);
	366
	367	/* Check the superblock signature. Since the qnx4 code is
	368	dangerous, we should leave as quickly as possible
	369	if we don't belong here... */
	370	bh = sb_bread(s, 1);
	371	if (!bh) {
	372	printk("qnx4: unable to read the superblock\n");
	373	goto outnobh;
	374	}
75043cb5	375	if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
1da177e4 LT	376	if (!silent)
	377	printk("qnx4: wrong fsid in superblock.\n");
	378	goto out;
	379	}
	380	s->s_op = &qnx4_sops;
	381	s->s_magic = QNX4_SUPER_MAGIC;
	382	#ifndef CONFIG_QNX4FS_RW
	383	s->s_flags \|= MS_RDONLY; /* Yup, read-only yet */
	384	#endif
	385	qnx4_sb(s)->sb_buf = bh;
	386	qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
	387
	388
	389	/* check before allocating dentries, inodes, .. */
	390	errmsg = qnx4_checkroot(s);
	391	if (errmsg != NULL) {
	392	if (!silent)
	393	printk("qnx4: %s\n", errmsg);
	394	goto out;
	395	}
	396
	397	/* does root not have inode number QNX4_ROOT_INO ?? */
2b7e5bcb DH	398	root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
2b7e5bcb DH	399	if (IS_ERR(root)) {
1da177e4	400	printk("qnx4: get inode failed\n");
2b7e5bcb	401	ret = PTR_ERR(root);
1da177e4 LT	402	goto out;
	403	}
	404
2b7e5bcb	405	ret = -ENOMEM;
1da177e4 LT	406	s->s_root = d_alloc_root(root);
	407	if (s->s_root == NULL)
	408	goto outi;
	409
	410	brelse(bh);
	411
	412	return 0;
	413
	414	outi:
	415	iput(root);
	416	out:
	417	brelse(bh);
	418	outnobh:
	419	kfree(qs);
	420	s->s_fs_info = NULL;
2b7e5bcb	421	return ret;
1da177e4 LT	422	}
	423
	424	static void qnx4_put_super(struct super_block *sb)
	425	{
	426	struct qnx4_sb_info *qs = qnx4_sb(sb);
	427	kfree( qs->BitMap );
	428	kfree( qs );
	429	sb->s_fs_info = NULL;
	430	return;
	431	}
	432
	433	static int qnx4_writepage(struct page page, struct writeback_control wbc)
	434	{
	435	return block_write_full_page(page,qnx4_get_block, wbc);
	436	}
f8706184	437
1da177e4 LT	438	static int qnx4_readpage(struct file file, struct page page)
	439	{
	440	return block_read_full_page(page,qnx4_get_block);
	441	}
f8706184 NP	442
	443	static int qnx4_write_begin(struct file file, struct address_space mapping,
	444	loff_t pos, unsigned len, unsigned flags,
	445	struct page pagep, void fsdata)
1da177e4	446	{
f8706184 NP	447	struct qnx4_inode_info *qnx4_inode = qnx4_i(mapping->host);
	448	*pagep = NULL;
	449	return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
	450	qnx4_get_block,
	451	&qnx4_inode->mmu_private);
1da177e4 LT	452	}
	453	static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
	454	{
	455	return generic_block_bmap(mapping,block,qnx4_get_block);
	456	}
f5e54d6e	457	static const struct address_space_operations qnx4_aops = {
1da177e4 LT	458	.readpage = qnx4_readpage,
	459	.writepage = qnx4_writepage,
	460	.sync_page = block_sync_page,
f8706184 NP	461	.write_begin = qnx4_write_begin,
f8706184 NP	462	.write_end = generic_write_end,
1da177e4 LT	463	.bmap = qnx4_bmap
	464	};
	465
2b7e5bcb	466	struct inode qnx4_iget(struct super_block sb, unsigned long ino)
1da177e4 LT	467	{
	468	struct buffer_head *bh;
	469	struct qnx4_inode_entry *raw_inode;
2b7e5bcb DH	470	int block;
	471	struct qnx4_inode_entry *qnx4_inode;
	472	struct inode *inode;
1da177e4	473
2b7e5bcb DH	474	inode = iget_locked(sb, ino);
	475	if (!inode)
	476	return ERR_PTR(-ENOMEM);
	477	if (!(inode->i_state & I_NEW))
	478	return inode;
	479
	480	qnx4_inode = qnx4_raw_inode(inode);
1da177e4 LT	481	inode->i_mode = 0;
	482
	483	QNX4DEBUG(("Reading inode : [%d]\n", ino));
	484	if (!ino) {
2b7e5bcb DH	485	printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
2b7e5bcb DH	486	"out of range\n",
1da177e4	487	sb->s_id, ino);
2b7e5bcb DH	488	iget_failed(inode);
2b7e5bcb DH	489	return ERR_PTR(-EIO);
1da177e4 LT	490	}
	491	block = ino / QNX4_INODES_PER_BLOCK;
	492
	493	if (!(bh = sb_bread(sb, block))) {
	494	printk("qnx4: major problem: unable to read inode from dev "
	495	"%s\n", sb->s_id);
2b7e5bcb DH	496	iget_failed(inode);
2b7e5bcb DH	497	return ERR_PTR(-EIO);
1da177e4 LT	498	}
	499	raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
	500	(ino % QNX4_INODES_PER_BLOCK);
	501
	502	inode->i_mode = le16_to_cpu(raw_inode->di_mode);
	503	inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid);
	504	inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid);
	505	inode->i_nlink = le16_to_cpu(raw_inode->di_nlink);
	506	inode->i_size = le32_to_cpu(raw_inode->di_size);
	507	inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
	508	inode->i_mtime.tv_nsec = 0;
	509	inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
	510	inode->i_atime.tv_nsec = 0;
	511	inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
	512	inode->i_ctime.tv_nsec = 0;
	513	inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
1da177e4 LT	514
	515	memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
	516	if (S_ISREG(inode->i_mode)) {
	517	inode->i_op = &qnx4_file_inode_operations;
	518	inode->i_fop = &qnx4_file_operations;
	519	inode->i_mapping->a_ops = &qnx4_aops;
	520	qnx4_i(inode)->mmu_private = inode->i_size;
	521	} else if (S_ISDIR(inode->i_mode)) {
	522	inode->i_op = &qnx4_dir_inode_operations;
	523	inode->i_fop = &qnx4_dir_operations;
	524	} else if (S_ISLNK(inode->i_mode)) {
	525	inode->i_op = &page_symlink_inode_operations;
	526	inode->i_mapping->a_ops = &qnx4_aops;
	527	qnx4_i(inode)->mmu_private = inode->i_size;
2b7e5bcb DH	528	} else {
	529	printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
	530	ino, sb->s_id);
	531	iget_failed(inode);
	532	brelse(bh);
	533	return ERR_PTR(-EIO);
	534	}
1da177e4	535	brelse(bh);
2b7e5bcb DH	536	unlock_new_inode(inode);
2b7e5bcb DH	537	return inode;
1da177e4 LT	538	}
1da177e4 LT	539
e18b890b	540	static struct kmem_cache *qnx4_inode_cachep;
1da177e4 LT	541
	542	static struct inode qnx4_alloc_inode(struct super_block sb)
	543	{
	544	struct qnx4_inode_info *ei;
e94b1766	545	ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
1da177e4 LT	546	if (!ei)
	547	return NULL;
	548	return &ei->vfs_inode;
	549	}
	550
	551	static void qnx4_destroy_inode(struct inode *inode)
	552	{
	553	kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
	554	}
	555
51cc5068	556	static void init_once(void *foo)
1da177e4 LT	557	{
	558	struct qnx4_inode_info ei = (struct qnx4_inode_info ) foo;
	559
a35afb83	560	inode_init_once(&ei->vfs_inode);
1da177e4 LT	561	}
	562
	563	static int init_inodecache(void)
	564	{
	565	qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
	566	sizeof(struct qnx4_inode_info),
fffb60f9 PJ	567	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	568	SLAB_MEM_SPREAD),
20c2df83	569	init_once);
1da177e4 LT	570	if (qnx4_inode_cachep == NULL)
	571	return -ENOMEM;
	572	return 0;
	573	}
	574
	575	static void destroy_inodecache(void)
	576	{
1a1d92c1	577	kmem_cache_destroy(qnx4_inode_cachep);
1da177e4 LT	578	}
1da177e4 LT	579
454e2398 DH	580	static int qnx4_get_sb(struct file_system_type *fs_type,
454e2398 DH	581	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	582	{
454e2398 DH	583	return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super,
454e2398 DH	584	mnt);
1da177e4 LT	585	}
	586
	587	static struct file_system_type qnx4_fs_type = {
	588	.owner = THIS_MODULE,
	589	.name = "qnx4",
	590	.get_sb = qnx4_get_sb,
	591	.kill_sb = kill_block_super,
	592	.fs_flags = FS_REQUIRES_DEV,
	593	};
	594
	595	static int __init init_qnx4_fs(void)
	596	{
	597	int err;
	598
	599	err = init_inodecache();
	600	if (err)
	601	return err;
	602
	603	err = register_filesystem(&qnx4_fs_type);
	604	if (err) {
	605	destroy_inodecache();
	606	return err;
	607	}
	608
	609	printk("QNX4 filesystem 0.2.3 registered.\n");
	610	return 0;
	611	}
	612
	613	static void __exit exit_qnx4_fs(void)
	614	{
	615	unregister_filesystem(&qnx4_fs_type);
	616	destroy_inodecache();
	617	}
	618
	619	module_init(init_qnx4_fs)
	620	module_exit(exit_qnx4_fs)
	621	MODULE_LICENSE("GPL");
	622