[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/init.h>
#include <linux/slab.h>
#include <linux/highuid.h>
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include <linux/writeback.h>
#include <linux/statfs.h>
#include "qnx4.h"

#define QNX4_VERSION  4
#define QNX4_BMNAME   ".bitmap"

static const struct super_operations qnx4_sops;

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,
};

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;
	*flags |= MS_RDONLY;
	return 0;
}

static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
{
	unsigned long phys;

	QNX4DEBUG((KERN_INFO "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);
	}
	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((KERN_ERR "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((KERN_ERR "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((KERN_INFO "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);

	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);

	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;

	if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/')
		return "no qnx4 filesystem (no root dir).";
	QNX4DEBUG((KERN_NOTICE "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.";
		rootdir = (struct qnx4_inode_entry *) bh->b_data;
		for (i = 0; i < QNX4_INODES_PER_BLOCK; i++, rootdir++) {
			QNX4DEBUG((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname));
			if (strcmp(rootdir->di_fname, QNX4_BMNAME) != 0)
				continue;
			qnx4_sb(sb)->BitMap = kmemdup(rootdir,
						      sizeof(struct qnx4_inode_entry),
						      GFP_KERNEL);
			brelse(bh);
			if (!qnx4_sb(sb)->BitMap)
				return "not enough memory for bitmap inode";
			/* keep bitmap inode known */
			return NULL;
		}
		brelse(bh);
	}
	return "bitmap file not found.";
}

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(KERN_ERR "qnx4: unable to read the superblock\n");
		goto outnobh;
	}
	if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
		if (!silent)
			printk(KERN_ERR "qnx4: wrong fsid in superblock.\n");
		goto out;
	}
	s->s_op = &qnx4_sops;
	s->s_magic = QNX4_SUPER_MAGIC;
	s->s_flags |= MS_RDONLY;	/* Yup, read-only yet */
	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(KERN_ERR "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(KERN_ERR "qnx4: get inode failed\n");
		ret = PTR_ERR(root);
 		goto outb;
 	}

	ret = -ENOMEM;
 	s->s_root = d_make_root(root);
 	if (s->s_root == NULL)
 		goto outb;

	brelse(bh);
	return 0;

      outb:
	kfree(qs->BitMap);
      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_readpage(struct file *file, struct page *page)
{
	return block_read_full_page(page,qnx4_get_block);
}

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,
	.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((KERN_INFO "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(KERN_ERR "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);
	set_nlink(inode, 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_fop = &generic_ro_fops;
		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_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
}

static void qnx4_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, qnx4_i_callback);
}

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 struct dentry *qnx4_mount(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data)
{
	return mount_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
}

static struct file_system_type qnx4_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "qnx4",
	.mount		= qnx4_mount,
	.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(KERN_INFO "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	15	#include <linux/module.h>
1da177e4	16	#include <linux/init.h>
964f5369	17	#include <linux/slab.h>
1da177e4	18	#include <linux/highuid.h>
1da177e4 LT	19	#include <linux/pagemap.h>
1da177e4 LT	20	#include <linux/buffer_head.h>
79d25767	21	#include <linux/writeback.h>
964f5369 AV	22	#include <linux/statfs.h>
964f5369 AV	23	#include "qnx4.h"
1da177e4 LT	24
	25	#define QNX4_VERSION 4
	26	#define QNX4_BMNAME ".bitmap"
	27
ee9b6d61	28	static const struct super_operations qnx4_sops;
1da177e4	29
1da177e4 LT	30	static void qnx4_put_super(struct super_block *sb);
	31	static struct inode qnx4_alloc_inode(struct super_block sb);
	32	static void qnx4_destroy_inode(struct inode *inode);
1da177e4	33	static int qnx4_remount(struct super_block sb, int flags, char *data);
726c3342	34	static int qnx4_statfs(struct dentry , struct kstatfs );
1da177e4	35
ee9b6d61	36	static const struct super_operations qnx4_sops =
1da177e4 LT	37	{
	38	.alloc_inode = qnx4_alloc_inode,
	39	.destroy_inode = qnx4_destroy_inode,
1da177e4 LT	40	.put_super = qnx4_put_super,
	41	.statfs = qnx4_statfs,
	42	.remount_fs = qnx4_remount,
1da177e4 LT	43	};
	44
	45	static int qnx4_remount(struct super_block sb, int flags, char *data)
	46	{
	47	struct qnx4_sb_info *qs;
	48
	49	qs = qnx4_sb(sb);
	50	qs->Version = QNX4_VERSION;
1da177e4	51	*flags \|= MS_RDONLY;
1da177e4 LT	52	return 0;
	53	}
	54
1da177e4 LT	55	static int qnx4_get_block( struct inode inode, sector_t iblock, struct buffer_head bh, int create )
	56	{
	57	unsigned long phys;
	58
891ddb95	59	QNX4DEBUG((KERN_INFO "qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
1da177e4 LT	60
	61	phys = qnx4_block_map( inode, iblock );
	62	if ( phys ) {
	63	// logical block is before EOF
	64	map_bh(bh, inode->i_sb, phys);
1da177e4 LT	65	}
	66	return 0;
	67	}
	68
	69	unsigned long qnx4_block_map( struct inode *inode, long iblock )
	70	{
	71	int ix;
	72	long offset, i_xblk;
	73	unsigned long block = 0;
	74	struct buffer_head *bh = NULL;
	75	struct qnx4_xblk *xblk = NULL;
	76	struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
75043cb5	77	u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
1da177e4 LT	78
	79	if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) {
	80	// iblock is in the first extent. This is easy.
	81	block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1;
	82	} else {
	83	// iblock is beyond first extent. We have to follow the extent chain.
	84	i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
	85	offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size);
	86	ix = 0;
	87	while ( --nxtnt > 0 ) {
	88	if ( ix == 0 ) {
	89	// read next xtnt block.
	90	bh = sb_bread(inode->i_sb, i_xblk - 1);
	91	if ( !bh ) {
891ddb95	92	QNX4DEBUG((KERN_ERR "qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
1da177e4 LT	93	return -EIO;
	94	}
	95	xblk = (struct qnx4_xblk*)bh->b_data;
	96	if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
891ddb95	97	QNX4DEBUG((KERN_ERR "qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
1da177e4 LT	98	return -EIO;
	99	}
	100	}
	101	if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
	102	// got it!
	103	block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
	104	break;
	105	}
	106	offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
	107	if ( ++ix >= xblk->xblk_num_xtnts ) {
	108	i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
	109	ix = 0;
	110	brelse( bh );
	111	bh = NULL;
	112	}
	113	}
	114	if ( bh )
	115	brelse( bh );
	116	}
	117
891ddb95	118	QNX4DEBUG((KERN_INFO "qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
1da177e4 LT	119	return block;
	120	}
	121
726c3342	122	static int qnx4_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	123	{
726c3342	124	struct super_block *sb = dentry->d_sb;
5b76dc06	125	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
726c3342	126
1da177e4 LT	127	buf->f_type = sb->s_magic;
	128	buf->f_bsize = sb->s_blocksize;
	129	buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
	130	buf->f_bfree = qnx4_count_free_blocks(sb);
	131	buf->f_bavail = buf->f_bfree;
	132	buf->f_namelen = QNX4_NAME_MAX;
5b76dc06 CL	133	buf->f_fsid.val[0] = (u32)id;
5b76dc06 CL	134	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4	135
1da177e4 LT	136	return 0;
	137	}
	138
	139	/*
	140	* Check the root directory of the filesystem to make sure
	141	* it really _is_ a qnx4 filesystem, and to check the size
	142	* of the directory entry.
	143	*/
	144	static const char qnx4_checkroot(struct super_block sb)
	145	{
	146	struct buffer_head *bh;
	147	struct qnx4_inode_entry *rootdir;
	148	int rd, rl;
	149	int i, j;
1da177e4	150
4134bf81	151	if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/')
1da177e4	152	return "no qnx4 filesystem (no root dir).";
4134bf81 AV	153	QNX4DEBUG((KERN_NOTICE "QNX4 filesystem found on dev %s.\n", sb->s_id));
	154	rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
	155	rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size);
	156	for (j = 0; j < rl; j++) {
	157	bh = sb_bread(sb, rd + j); /* root dir, first block */
	158	if (bh == NULL)
	159	return "unable to read root entry.";
	160	rootdir = (struct qnx4_inode_entry *) bh->b_data;
	161	for (i = 0; i < QNX4_INODES_PER_BLOCK; i++, rootdir++) {
	162	QNX4DEBUG((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname));
	163	if (strcmp(rootdir->di_fname, QNX4_BMNAME) != 0)
	164	continue;
	165	qnx4_sb(sb)->BitMap = kmemdup(rootdir,
	166	sizeof(struct qnx4_inode_entry),
	167	GFP_KERNEL);
1da177e4	168	brelse(bh);
4134bf81 AV	169	if (!qnx4_sb(sb)->BitMap)
	170	return "not enough memory for bitmap inode";
	171	/* keep bitmap inode known */
	172	return NULL;
1da177e4	173	}
4134bf81	174	brelse(bh);
1da177e4	175	}
4134bf81	176	return "bitmap file not found.";
1da177e4 LT	177	}
	178
	179	static int qnx4_fill_super(struct super_block s, void data, int silent)
	180	{
	181	struct buffer_head *bh;
	182	struct inode *root;
	183	const char *errmsg;
	184	struct qnx4_sb_info *qs;
2b7e5bcb	185	int ret = -EINVAL;
1da177e4	186
f8314dc6	187	qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
073c2141	188	if (!qs)
1da177e4 LT	189	return -ENOMEM;
1da177e4 LT	190	s->s_fs_info = qs;
1da177e4 LT	191
	192	sb_set_blocksize(s, QNX4_BLOCK_SIZE);
	193
	194	/* Check the superblock signature. Since the qnx4 code is
	195	dangerous, we should leave as quickly as possible
	196	if we don't belong here... */
	197	bh = sb_bread(s, 1);
	198	if (!bh) {
891ddb95	199	printk(KERN_ERR "qnx4: unable to read the superblock\n");
1da177e4 LT	200	goto outnobh;
1da177e4 LT	201	}
75043cb5	202	if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
1da177e4	203	if (!silent)
891ddb95	204	printk(KERN_ERR "qnx4: wrong fsid in superblock.\n");
1da177e4 LT	205	goto out;
	206	}
	207	s->s_op = &qnx4_sops;
	208	s->s_magic = QNX4_SUPER_MAGIC;
1da177e4	209	s->s_flags \|= MS_RDONLY; /* Yup, read-only yet */
1da177e4 LT	210	qnx4_sb(s)->sb_buf = bh;
	211	qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
	212
	213
	214	/* check before allocating dentries, inodes, .. */
	215	errmsg = qnx4_checkroot(s);
	216	if (errmsg != NULL) {
	217	if (!silent)
891ddb95	218	printk(KERN_ERR "qnx4: %s\n", errmsg);
1da177e4 LT	219	goto out;
	220	}
	221
	222	/* does root not have inode number QNX4_ROOT_INO ?? */
2b7e5bcb DH	223	root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
2b7e5bcb DH	224	if (IS_ERR(root)) {
891ddb95	225	printk(KERN_ERR "qnx4: get inode failed\n");
2b7e5bcb	226	ret = PTR_ERR(root);
8bc5191b	227	goto outb;
1da177e4 LT	228	}
1da177e4 LT	229
2b7e5bcb	230	ret = -ENOMEM;
48fde701	231	s->s_root = d_make_root(root);
1da177e4	232	if (s->s_root == NULL)
48fde701	233	goto outb;
1da177e4 LT	234
1da177e4 LT	235	brelse(bh);
1da177e4 LT	236	return 0;
1da177e4 LT	237
8bc5191b AV	238	outb:
8bc5191b AV	239	kfree(qs->BitMap);
1da177e4 LT	240	out:
	241	brelse(bh);
	242	outnobh:
	243	kfree(qs);
	244	s->s_fs_info = NULL;
2b7e5bcb	245	return ret;
1da177e4 LT	246	}
	247
	248	static void qnx4_put_super(struct super_block *sb)
	249	{
	250	struct qnx4_sb_info *qs = qnx4_sb(sb);
	251	kfree( qs->BitMap );
	252	kfree( qs );
	253	sb->s_fs_info = NULL;
	254	return;
	255	}
	256
1da177e4 LT	257	static int qnx4_readpage(struct file file, struct page page)
	258	{
	259	return block_read_full_page(page,qnx4_get_block);
	260	}
f8706184	261
1da177e4 LT	262	static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
	263	{
	264	return generic_block_bmap(mapping,block,qnx4_get_block);
	265	}
f5e54d6e	266	static const struct address_space_operations qnx4_aops = {
1da177e4	267	.readpage = qnx4_readpage,
1da177e4 LT	268	.bmap = qnx4_bmap
	269	};
	270
2b7e5bcb	271	struct inode qnx4_iget(struct super_block sb, unsigned long ino)
1da177e4 LT	272	{
	273	struct buffer_head *bh;
	274	struct qnx4_inode_entry *raw_inode;
2b7e5bcb DH	275	int block;
	276	struct qnx4_inode_entry *qnx4_inode;
	277	struct inode *inode;
1da177e4	278
2b7e5bcb DH	279	inode = iget_locked(sb, ino);
	280	if (!inode)
	281	return ERR_PTR(-ENOMEM);
	282	if (!(inode->i_state & I_NEW))
	283	return inode;
	284
	285	qnx4_inode = qnx4_raw_inode(inode);
1da177e4 LT	286	inode->i_mode = 0;
1da177e4 LT	287
891ddb95	288	QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino));
1da177e4	289	if (!ino) {
2b7e5bcb DH	290	printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
2b7e5bcb DH	291	"out of range\n",
1da177e4	292	sb->s_id, ino);
2b7e5bcb DH	293	iget_failed(inode);
2b7e5bcb DH	294	return ERR_PTR(-EIO);
1da177e4 LT	295	}
	296	block = ino / QNX4_INODES_PER_BLOCK;
	297
	298	if (!(bh = sb_bread(sb, block))) {
891ddb95	299	printk(KERN_ERR "qnx4: major problem: unable to read inode from dev "
1da177e4	300	"%s\n", sb->s_id);
2b7e5bcb DH	301	iget_failed(inode);
2b7e5bcb DH	302	return ERR_PTR(-EIO);
1da177e4 LT	303	}
	304	raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
	305	(ino % QNX4_INODES_PER_BLOCK);
	306
	307	inode->i_mode = le16_to_cpu(raw_inode->di_mode);
	308	inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid);
	309	inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid);
bfe86848	310	set_nlink(inode, le16_to_cpu(raw_inode->di_nlink));
1da177e4 LT	311	inode->i_size = le32_to_cpu(raw_inode->di_size);
	312	inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
	313	inode->i_mtime.tv_nsec = 0;
	314	inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
	315	inode->i_atime.tv_nsec = 0;
	316	inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
	317	inode->i_ctime.tv_nsec = 0;
	318	inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
1da177e4 LT	319
	320	memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
	321	if (S_ISREG(inode->i_mode)) {
945ffe54	322	inode->i_fop = &generic_ro_fops;
1da177e4 LT	323	inode->i_mapping->a_ops = &qnx4_aops;
	324	qnx4_i(inode)->mmu_private = inode->i_size;
	325	} else if (S_ISDIR(inode->i_mode)) {
	326	inode->i_op = &qnx4_dir_inode_operations;
	327	inode->i_fop = &qnx4_dir_operations;
	328	} else if (S_ISLNK(inode->i_mode)) {
	329	inode->i_op = &page_symlink_inode_operations;
	330	inode->i_mapping->a_ops = &qnx4_aops;
	331	qnx4_i(inode)->mmu_private = inode->i_size;
2b7e5bcb DH	332	} else {
	333	printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
	334	ino, sb->s_id);
	335	iget_failed(inode);
	336	brelse(bh);
	337	return ERR_PTR(-EIO);
	338	}
1da177e4	339	brelse(bh);
2b7e5bcb DH	340	unlock_new_inode(inode);
2b7e5bcb DH	341	return inode;
1da177e4 LT	342	}
1da177e4 LT	343
e18b890b	344	static struct kmem_cache *qnx4_inode_cachep;
1da177e4 LT	345
	346	static struct inode qnx4_alloc_inode(struct super_block sb)
	347	{
	348	struct qnx4_inode_info *ei;
e94b1766	349	ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
1da177e4 LT	350	if (!ei)
	351	return NULL;
	352	return &ei->vfs_inode;
	353	}
	354
fa0d7e3d	355	static void qnx4_i_callback(struct rcu_head *head)
1da177e4	356	{
fa0d7e3d	357	struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4 LT	358	kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
	359	}
	360
fa0d7e3d NP	361	static void qnx4_destroy_inode(struct inode *inode)
	362	{
	363	call_rcu(&inode->i_rcu, qnx4_i_callback);
	364	}
	365
51cc5068	366	static void init_once(void *foo)
1da177e4 LT	367	{
	368	struct qnx4_inode_info ei = (struct qnx4_inode_info ) foo;
	369
a35afb83	370	inode_init_once(&ei->vfs_inode);
1da177e4 LT	371	}
	372
	373	static int init_inodecache(void)
	374	{
	375	qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
	376	sizeof(struct qnx4_inode_info),
fffb60f9 PJ	377	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	378	SLAB_MEM_SPREAD),
20c2df83	379	init_once);
1da177e4 LT	380	if (qnx4_inode_cachep == NULL)
	381	return -ENOMEM;
	382	return 0;
	383	}
	384
	385	static void destroy_inodecache(void)
	386	{
1a1d92c1	387	kmem_cache_destroy(qnx4_inode_cachep);
1da177e4 LT	388	}
1da177e4 LT	389
152a0836 AV	390	static struct dentry qnx4_mount(struct file_system_type fs_type,
152a0836 AV	391	int flags, const char dev_name, void data)
1da177e4	392	{
152a0836	393	return mount_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
1da177e4 LT	394	}
	395
	396	static struct file_system_type qnx4_fs_type = {
	397	.owner = THIS_MODULE,
	398	.name = "qnx4",
152a0836	399	.mount = qnx4_mount,
1da177e4 LT	400	.kill_sb = kill_block_super,
	401	.fs_flags = FS_REQUIRES_DEV,
	402	};
	403
	404	static int __init init_qnx4_fs(void)
	405	{
	406	int err;
	407
	408	err = init_inodecache();
	409	if (err)
	410	return err;
	411
	412	err = register_filesystem(&qnx4_fs_type);
	413	if (err) {
	414	destroy_inodecache();
	415	return err;
	416	}
	417
891ddb95	418	printk(KERN_INFO "QNX4 filesystem 0.2.3 registered.\n");
1da177e4 LT	419	return 0;
	420	}
	421
	422	static void __exit exit_qnx4_fs(void)
	423	{
	424	unregister_filesystem(&qnx4_fs_type);
	425	destroy_inodecache();
	426	}
	427
	428	module_init(init_qnx4_fs)
	429	module_exit(exit_qnx4_fs)
	430	MODULE_LICENSE("GPL");
	431