[deliverable/linux.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 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,
#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;
	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);

	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;
	buf->f_fsid.val[0] = (u32)id;
	buf->f_fsid.val[1] = (u32)(id >> 32);

	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
1da177e4 LT	73	static int qnx4_write_inode(struct inode *inode, int unused)
	74	{
	75	struct qnx4_inode_entry *raw_inode;
	76	int block, ino;
	77	struct buffer_head *bh;
	78	ino = inode->i_ino;
	79
	80	QNX4DEBUG(("qnx4: write inode 1.\n"));
	81	if (inode->i_nlink == 0) {
	82	return 0;
	83	}
	84	if (!ino) {
	85	printk("qnx4: bad inode number on dev %s: %d is out of range\n",
	86	inode->i_sb->s_id, ino);
	87	return -EIO;
	88	}
	89	QNX4DEBUG(("qnx4: write inode 2.\n"));
	90	block = ino / QNX4_INODES_PER_BLOCK;
	91	lock_kernel();
	92	if (!(bh = sb_bread(inode->i_sb, block))) {
	93	printk("qnx4: major problem: unable to read inode from dev "
	94	"%s\n", inode->i_sb->s_id);
	95	unlock_kernel();
	96	return -EIO;
	97	}
	98	raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
	99	(ino % QNX4_INODES_PER_BLOCK);
	100	raw_inode->di_mode = cpu_to_le16(inode->i_mode);
	101	raw_inode->di_uid = cpu_to_le16(fs_high2lowuid(inode->i_uid));
	102	raw_inode->di_gid = cpu_to_le16(fs_high2lowgid(inode->i_gid));
	103	raw_inode->di_nlink = cpu_to_le16(inode->i_nlink);
	104	raw_inode->di_size = cpu_to_le32(inode->i_size);
	105	raw_inode->di_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
	106	raw_inode->di_atime = cpu_to_le32(inode->i_atime.tv_sec);
	107	raw_inode->di_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
	108	raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks);
	109	mark_buffer_dirty(bh);
	110	brelse(bh);
	111	unlock_kernel();
	112	return 0;
	113	}
	114
	115	#endif
	116
	117	static void qnx4_put_super(struct super_block *sb);
	118	static struct inode qnx4_alloc_inode(struct super_block sb);
	119	static void qnx4_destroy_inode(struct inode *inode);
1da177e4	120	static int qnx4_remount(struct super_block sb, int flags, char *data);
726c3342	121	static int qnx4_statfs(struct dentry , struct kstatfs );
1da177e4	122
ee9b6d61	123	static const struct super_operations qnx4_sops =
1da177e4 LT	124	{
	125	.alloc_inode = qnx4_alloc_inode,
	126	.destroy_inode = qnx4_destroy_inode,
1da177e4 LT	127	.put_super = qnx4_put_super,
	128	.statfs = qnx4_statfs,
	129	.remount_fs = qnx4_remount,
	130	#ifdef CONFIG_QNX4FS_RW
	131	.write_inode = qnx4_write_inode,
	132	.delete_inode = qnx4_delete_inode,
1da177e4 LT	133	#endif
	134	};
	135
	136	static int qnx4_remount(struct super_block sb, int flags, char *data)
	137	{
	138	struct qnx4_sb_info *qs;
	139
	140	qs = qnx4_sb(sb);
	141	qs->Version = QNX4_VERSION;
	142	#ifndef CONFIG_QNX4FS_RW
	143	*flags \|= MS_RDONLY;
	144	#endif
	145	if (*flags & MS_RDONLY) {
	146	return 0;
	147	}
	148
	149	mark_buffer_dirty(qs->sb_buf);
	150
	151	return 0;
	152	}
	153
	154	static struct buffer_head qnx4_getblk(struct inode inode, int nr,
	155	int create)
	156	{
	157	struct buffer_head *result = NULL;
	158
	159	if ( nr >= 0 )
	160	nr = qnx4_block_map( inode, nr );
	161	if (nr) {
	162	result = sb_getblk(inode->i_sb, nr);
	163	return result;
	164	}
	165	if (!create) {
	166	return NULL;
	167	}
	168	#if 0
	169	tmp = qnx4_new_block(inode->i_sb);
	170	if (!tmp) {
	171	return NULL;
	172	}
	173	result = sb_getblk(inode->i_sb, tmp);
	174	if (tst) {
	175	qnx4_free_block(inode->i_sb, tmp);
	176	brelse(result);
	177	goto repeat;
	178	}
	179	tst = tmp;
	180	#endif
	181	inode->i_ctime = CURRENT_TIME_SEC;
	182	mark_inode_dirty(inode);
	183	return result;
	184	}
	185
	186	struct buffer_head qnx4_bread(struct inode inode, int block, int create)
	187	{
	188	struct buffer_head *bh;
	189
	190	bh = qnx4_getblk(inode, block, create);
	191	if (!bh \|\| buffer_uptodate(bh)) {
	192	return bh;
	193	}
	194	ll_rw_block(READ, 1, &bh);
	195	wait_on_buffer(bh);
	196	if (buffer_uptodate(bh)) {
197	return bh;
198	}
199	brelse(bh);
200
201	return NULL;
202	}
203
204	static int qnx4_get_block( struct inode inode, sector_t iblock, struct buffer_head bh, int create )
205	{
206	unsigned long phys;
207
208	QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
209
210	phys = qnx4_block_map( inode, iblock );
211	if ( phys ) {
212	// logical block is before EOF
213	map_bh(bh, inode->i_sb, phys);
214	} else if ( create ) {
215	// to be done.
216	}
217	return 0;
218	}
219
220	unsigned long qnx4_block_map( struct inode *inode, long iblock )
221	{
222	int ix;
223	long offset, i_xblk;
224	unsigned long block = 0;
225	struct buffer_head *bh = NULL;
226	struct qnx4_xblk *xblk = NULL;
227	struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
75043cb5	228	u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
1da177e4 LT	229
	230	if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) {
	231	// iblock is in the first extent. This is easy.
	232	block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1;
	233	} else {
	234	// iblock is beyond first extent. We have to follow the extent chain.
	235	i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
	236	offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size);
	237	ix = 0;
	238	while ( --nxtnt > 0 ) {
	239	if ( ix == 0 ) {
	240	// read next xtnt block.
	241	bh = sb_bread(inode->i_sb, i_xblk - 1);
	242	if ( !bh ) {
	243	QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
	244	return -EIO;
	245	}
	246	xblk = (struct qnx4_xblk*)bh->b_data;
	247	if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
	248	QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
	249	return -EIO;
	250	}
	251	}
	252	if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
	253	// got it!
	254	block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
	255	break;
	256	}
	257	offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
	258	if ( ++ix >= xblk->xblk_num_xtnts ) {
	259	i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
	260	ix = 0;
	261	brelse( bh );
	262	bh = NULL;
	263	}
	264	}
	265	if ( bh )
	266	brelse( bh );
	267	}
	268
	269	QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
	270	return block;
	271	}
	272
726c3342	273	static int qnx4_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	274	{
726c3342	275	struct super_block *sb = dentry->d_sb;
5b76dc06	276	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
726c3342	277
1da177e4 LT	278	lock_kernel();
	279
	280	buf->f_type = sb->s_magic;
	281	buf->f_bsize = sb->s_blocksize;
	282	buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
	283	buf->f_bfree = qnx4_count_free_blocks(sb);
	284	buf->f_bavail = buf->f_bfree;
	285	buf->f_namelen = QNX4_NAME_MAX;
5b76dc06 CL	286	buf->f_fsid.val[0] = (u32)id;
5b76dc06 CL	287	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	288
	289	unlock_kernel();
	290
	291	return 0;
	292	}
	293
	294	/*
	295	* Check the root directory of the filesystem to make sure
	296	* it really _is_ a qnx4 filesystem, and to check the size
	297	* of the directory entry.
	298	*/
	299	static const char qnx4_checkroot(struct super_block sb)
	300	{
	301	struct buffer_head *bh;
	302	struct qnx4_inode_entry *rootdir;
	303	int rd, rl;
	304	int i, j;
	305	int found = 0;
	306
	307	if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') {
	308	return "no qnx4 filesystem (no root dir).";
	309	} else {
	310	QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", sb->s_id));
	311	rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
	312	rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size);
	313	for (j = 0; j < rl; j++) {
	314	bh = sb_bread(sb, rd + j); /* root dir, first block */
	315	if (bh == NULL) {
	316	return "unable to read root entry.";
	317	}
	318	for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
	319	rootdir = (struct qnx4_inode_entry ) (bh->b_data + i QNX4_DIR_ENTRY_SIZE);
	320	if (rootdir->di_fname != NULL) {
	321	QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname));
	322	if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {
	323	found = 1;
	324	qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
	325	if (!qnx4_sb(sb)->BitMap) {
	326	brelse (bh);
	327	return "not enough memory for bitmap inode";
	328	}
	329	memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) ); /* keep bitmap inode known */
	330	break;
	331	}
	332	}
	333	}
	334	brelse(bh);
	335	if (found != 0) {
	336	break;
	337	}
	338	}
	339	if (found == 0) {
	340	return "bitmap file not found.";
	341	}
	342	}
	343	return NULL;
	344	}
	345
	346	static int qnx4_fill_super(struct super_block s, void data, int silent)
	347	{
	348	struct buffer_head *bh;
	349	struct inode *root;
	350	const char *errmsg;
	351	struct qnx4_sb_info *qs;
2b7e5bcb	352	int ret = -EINVAL;
1da177e4	353
f8314dc6	354	qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
1da177e4 LT	355	if (!qs)
	356	return -ENOMEM;
	357	s->s_fs_info = qs;
1da177e4 LT	358
	359	sb_set_blocksize(s, QNX4_BLOCK_SIZE);
	360
	361	/* Check the superblock signature. Since the qnx4 code is
	362	dangerous, we should leave as quickly as possible
	363	if we don't belong here... */
	364	bh = sb_bread(s, 1);
	365	if (!bh) {
	366	printk("qnx4: unable to read the superblock\n");
	367	goto outnobh;
	368	}
75043cb5	369	if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
1da177e4 LT	370	if (!silent)
	371	printk("qnx4: wrong fsid in superblock.\n");
	372	goto out;
	373	}
	374	s->s_op = &qnx4_sops;
	375	s->s_magic = QNX4_SUPER_MAGIC;
	376	#ifndef CONFIG_QNX4FS_RW
	377	s->s_flags \|= MS_RDONLY; /* Yup, read-only yet */
	378	#endif
	379	qnx4_sb(s)->sb_buf = bh;
	380	qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
	381
	382
	383	/* check before allocating dentries, inodes, .. */
	384	errmsg = qnx4_checkroot(s);
	385	if (errmsg != NULL) {
	386	if (!silent)
	387	printk("qnx4: %s\n", errmsg);
	388	goto out;
	389	}
	390
	391	/* does root not have inode number QNX4_ROOT_INO ?? */
2b7e5bcb DH	392	root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
2b7e5bcb DH	393	if (IS_ERR(root)) {
1da177e4	394	printk("qnx4: get inode failed\n");
2b7e5bcb	395	ret = PTR_ERR(root);
1da177e4 LT	396	goto out;
	397	}
	398
2b7e5bcb	399	ret = -ENOMEM;
1da177e4 LT	400	s->s_root = d_alloc_root(root);
	401	if (s->s_root == NULL)
	402	goto outi;
	403
	404	brelse(bh);
	405
	406	return 0;
	407
	408	outi:
	409	iput(root);
	410	out:
	411	brelse(bh);
	412	outnobh:
	413	kfree(qs);
	414	s->s_fs_info = NULL;
2b7e5bcb	415	return ret;
1da177e4 LT	416	}
	417
	418	static void qnx4_put_super(struct super_block *sb)
	419	{
	420	struct qnx4_sb_info *qs = qnx4_sb(sb);
	421	kfree( qs->BitMap );
	422	kfree( qs );
	423	sb->s_fs_info = NULL;
	424	return;
	425	}
	426
	427	static int qnx4_writepage(struct page page, struct writeback_control wbc)
	428	{
	429	return block_write_full_page(page,qnx4_get_block, wbc);
	430	}
f8706184	431
1da177e4 LT	432	static int qnx4_readpage(struct file file, struct page page)
	433	{
	434	return block_read_full_page(page,qnx4_get_block);
	435	}
f8706184 NP	436
	437	static int qnx4_write_begin(struct file file, struct address_space mapping,
	438	loff_t pos, unsigned len, unsigned flags,
	439	struct page pagep, void fsdata)
1da177e4	440	{
f8706184 NP	441	struct qnx4_inode_info *qnx4_inode = qnx4_i(mapping->host);
	442	*pagep = NULL;
	443	return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
	444	qnx4_get_block,
	445	&qnx4_inode->mmu_private);
1da177e4 LT	446	}
	447	static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
	448	{
	449	return generic_block_bmap(mapping,block,qnx4_get_block);
	450	}
f5e54d6e	451	static const struct address_space_operations qnx4_aops = {
1da177e4 LT	452	.readpage = qnx4_readpage,
	453	.writepage = qnx4_writepage,
	454	.sync_page = block_sync_page,
f8706184 NP	455	.write_begin = qnx4_write_begin,
f8706184 NP	456	.write_end = generic_write_end,
1da177e4 LT	457	.bmap = qnx4_bmap
	458	};
	459
2b7e5bcb	460	struct inode qnx4_iget(struct super_block sb, unsigned long ino)
1da177e4 LT	461	{
	462	struct buffer_head *bh;
	463	struct qnx4_inode_entry *raw_inode;
2b7e5bcb DH	464	int block;
	465	struct qnx4_inode_entry *qnx4_inode;
	466	struct inode *inode;
1da177e4	467
2b7e5bcb DH	468	inode = iget_locked(sb, ino);
	469	if (!inode)
	470	return ERR_PTR(-ENOMEM);
	471	if (!(inode->i_state & I_NEW))
	472	return inode;
	473
	474	qnx4_inode = qnx4_raw_inode(inode);
1da177e4 LT	475	inode->i_mode = 0;
	476
	477	QNX4DEBUG(("Reading inode : [%d]\n", ino));
	478	if (!ino) {
2b7e5bcb DH	479	printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
2b7e5bcb DH	480	"out of range\n",
1da177e4	481	sb->s_id, ino);
2b7e5bcb DH	482	iget_failed(inode);
2b7e5bcb DH	483	return ERR_PTR(-EIO);
1da177e4 LT	484	}
	485	block = ino / QNX4_INODES_PER_BLOCK;
	486
	487	if (!(bh = sb_bread(sb, block))) {
	488	printk("qnx4: major problem: unable to read inode from dev "
	489	"%s\n", sb->s_id);
2b7e5bcb DH	490	iget_failed(inode);
2b7e5bcb DH	491	return ERR_PTR(-EIO);
1da177e4 LT	492	}
	493	raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
	494	(ino % QNX4_INODES_PER_BLOCK);
	495
	496	inode->i_mode = le16_to_cpu(raw_inode->di_mode);
	497	inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid);
	498	inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid);
	499	inode->i_nlink = le16_to_cpu(raw_inode->di_nlink);
	500	inode->i_size = le32_to_cpu(raw_inode->di_size);
	501	inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
	502	inode->i_mtime.tv_nsec = 0;
	503	inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
	504	inode->i_atime.tv_nsec = 0;
	505	inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
	506	inode->i_ctime.tv_nsec = 0;
	507	inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
1da177e4 LT	508
	509	memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
	510	if (S_ISREG(inode->i_mode)) {
	511	inode->i_op = &qnx4_file_inode_operations;
	512	inode->i_fop = &qnx4_file_operations;
	513	inode->i_mapping->a_ops = &qnx4_aops;
	514	qnx4_i(inode)->mmu_private = inode->i_size;
	515	} else if (S_ISDIR(inode->i_mode)) {
	516	inode->i_op = &qnx4_dir_inode_operations;
	517	inode->i_fop = &qnx4_dir_operations;
	518	} else if (S_ISLNK(inode->i_mode)) {
	519	inode->i_op = &page_symlink_inode_operations;
	520	inode->i_mapping->a_ops = &qnx4_aops;
	521	qnx4_i(inode)->mmu_private = inode->i_size;
2b7e5bcb DH	522	} else {
	523	printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
	524	ino, sb->s_id);
	525	iget_failed(inode);
	526	brelse(bh);
	527	return ERR_PTR(-EIO);
	528	}
1da177e4	529	brelse(bh);
2b7e5bcb DH	530	unlock_new_inode(inode);
2b7e5bcb DH	531	return inode;
1da177e4 LT	532	}
1da177e4 LT	533
e18b890b	534	static struct kmem_cache *qnx4_inode_cachep;
1da177e4 LT	535
	536	static struct inode qnx4_alloc_inode(struct super_block sb)
	537	{
	538	struct qnx4_inode_info *ei;
e94b1766	539	ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
1da177e4 LT	540	if (!ei)
	541	return NULL;
	542	return &ei->vfs_inode;
	543	}
	544
	545	static void qnx4_destroy_inode(struct inode *inode)
	546	{
	547	kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
	548	}
	549
51cc5068	550	static void init_once(void *foo)
1da177e4 LT	551	{
	552	struct qnx4_inode_info ei = (struct qnx4_inode_info ) foo;
	553
a35afb83	554	inode_init_once(&ei->vfs_inode);
1da177e4 LT	555	}
	556
	557	static int init_inodecache(void)
	558	{
	559	qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
	560	sizeof(struct qnx4_inode_info),
fffb60f9 PJ	561	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	562	SLAB_MEM_SPREAD),
20c2df83	563	init_once);
1da177e4 LT	564	if (qnx4_inode_cachep == NULL)
	565	return -ENOMEM;
	566	return 0;
	567	}
	568
	569	static void destroy_inodecache(void)
	570	{
1a1d92c1	571	kmem_cache_destroy(qnx4_inode_cachep);
1da177e4 LT	572	}
1da177e4 LT	573
454e2398 DH	574	static int qnx4_get_sb(struct file_system_type *fs_type,
454e2398 DH	575	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	576	{
454e2398 DH	577	return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super,
454e2398 DH	578	mnt);
1da177e4 LT	579	}
	580
	581	static struct file_system_type qnx4_fs_type = {
	582	.owner = THIS_MODULE,
	583	.name = "qnx4",
	584	.get_sb = qnx4_get_sb,
	585	.kill_sb = kill_block_super,
	586	.fs_flags = FS_REQUIRES_DEV,
	587	};
	588
	589	static int __init init_qnx4_fs(void)
	590	{
	591	int err;
	592
	593	err = init_inodecache();
	594	if (err)
	595	return err;
	596
	597	err = register_filesystem(&qnx4_fs_type);
	598	if (err) {
	599	destroy_inodecache();
	600	return err;
	601	}
	602
	603	printk("QNX4 filesystem 0.2.3 registered.\n");
	604	return 0;
	605	}
	606
	607	static void __exit exit_qnx4_fs(void)
	608	{
	609	unregister_filesystem(&qnx4_fs_type);
	610	destroy_inodecache();
	611	}
	612
	613	module_init(init_qnx4_fs)
	614	module_exit(exit_qnx4_fs)
	615	MODULE_LICENSE("GPL");
	616