[linux.git] / fs / qnx4 / inode.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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 <linux/fs_context.h>
#include "qnx4.h"

#define QNX4_VERSION  4
#define QNX4_BMNAME   ".bitmap"

static const struct super_operations qnx4_sops;

static struct inode *qnx4_alloc_inode(struct super_block *sb);
static void qnx4_free_inode(struct inode *inode);
static int qnx4_statfs(struct dentry *, struct kstatfs *);
static int qnx4_get_tree(struct fs_context *fc);

static const struct super_operations qnx4_sops =
{
	.alloc_inode	= qnx4_alloc_inode,
	.free_inode	= qnx4_free_inode,
	.statfs		= qnx4_statfs,
};

static int qnx4_reconfigure(struct fs_context *fc)
{
	struct super_block *sb = fc->root->d_sb;
	struct qnx4_sb_info *qs;

	sync_filesystem(sb);
	qs = qnx4_sb(sb);
	qs->Version = QNX4_VERSION;
	fc->sb_flags |= SB_RDONLY;
	return 0;
}

static const struct fs_context_operations qnx4_context_opts = {
	.get_tree	= qnx4_get_tree,
	.reconfigure	= qnx4_reconfigure,
};

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;
}

static inline u32 try_extent(qnx4_xtnt_t *extent, u32 *offset)
{
	u32 size = le32_to_cpu(extent->xtnt_size);
	if (*offset < size)
		return le32_to_cpu(extent->xtnt_blk) + *offset - 1;
	*offset -= size;
	return 0;
}

unsigned long qnx4_block_map( struct inode *inode, long iblock )
{
	int ix;
	long i_xblk;
	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);
	u32 offset = iblock;
	u32 block = try_extent(&qnx4_inode->di_first_xtnt, &offset);

	if (block) {
		// iblock is in the first extent. This is easy.
	} else {
		// iblock is beyond first extent. We have to follow the extent chain.
		i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
		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;
				}
			}
			block = try_extent(&xblk->xblk_xtnts[ix], &offset);
			if (block) {
				// got it!
				break;
			}
			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    = u64_to_fsid(id);

	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 qnx4_super_block *s)
{
	struct buffer_head *bh;
	struct qnx4_inode_entry *rootdir;
	int rd, rl;
	int i, j;

	if (s->RootDir.di_fname[0] != '/' || s->RootDir.di_fname[1] != '\0')
		return "no qnx4 filesystem (no root dir).";
	QNX4DEBUG((KERN_NOTICE "QNX4 filesystem found on dev %s.\n", sb->s_id));
	rd = le32_to_cpu(s->RootDir.di_first_xtnt.xtnt_blk) - 1;
	rl = le32_to_cpu(s->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, struct fs_context *fc)
{
	struct buffer_head *bh;
	struct inode *root;
	const char *errmsg;
	struct qnx4_sb_info *qs;
	int silent = fc->sb_flags & SB_SILENT;

	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);

	s->s_op = &qnx4_sops;
	s->s_magic = QNX4_SUPER_MAGIC;
	s->s_flags |= SB_RDONLY;	/* Yup, read-only yet */
	s->s_time_min = 0;
	s->s_time_max = U32_MAX;

	/* 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");
		return -EINVAL;
	}

 	/* check before allocating dentries, inodes, .. */
	errmsg = qnx4_checkroot(s, (struct qnx4_super_block *) bh->b_data);
	brelse(bh);
	if (errmsg != NULL) {
		if (!silent)
			printk(KERN_ERR "qnx4: %s\n", errmsg);
		return -EINVAL;
	}

 	/* 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");
		return PTR_ERR(root);
 	}

 	s->s_root = d_make_root(root);
 	if (s->s_root == NULL)
 		return -ENOMEM;

	return 0;
}

static int qnx4_get_tree(struct fs_context *fc)
{
	return get_tree_bdev(fc, qnx4_fill_super);
}

static int qnx4_init_fs_context(struct fs_context *fc)
{
	fc->ops = &qnx4_context_opts;

	return 0;
}

static void qnx4_kill_sb(struct super_block *sb)
{
	struct qnx4_sb_info *qs = qnx4_sb(sb);
	kill_block_super(sb);
	if (qs) {
		kfree(qs->BitMap);
		kfree(qs);
	}
}

static int qnx4_read_folio(struct file *file, struct folio *folio)
{
	return block_read_full_folio(folio, 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 = {
	.read_folio	= qnx4_read_folio,
	.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);
	i_uid_write(inode, (uid_t)le16_to_cpu(raw_inode->di_uid));
	i_gid_write(inode, (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_set_mtime(inode, le32_to_cpu(raw_inode->di_mtime), 0);
	inode_set_atime(inode, le32_to_cpu(raw_inode->di_atime), 0);
	inode_set_ctime(inode, le32_to_cpu(raw_inode->di_ctime), 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_nohighmem(inode);
		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 = alloc_inode_sb(sb, qnx4_inode_cachep, GFP_KERNEL);
	if (!ei)
		return NULL;
	return &ei->vfs_inode;
}

static void qnx4_free_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_ACCOUNT),
					     init_once);
	if (qnx4_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
	kmem_cache_destroy(qnx4_inode_cachep);
}

static struct file_system_type qnx4_fs_type = {
	.owner			= THIS_MODULE,
	.name			= "qnx4",
	.kill_sb		= qnx4_kill_sb,
	.fs_flags		= FS_REQUIRES_DEV,
	.init_fs_context	= qnx4_init_fs_context,
};
MODULE_ALIAS_FS("qnx4");

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_DESCRIPTION("QNX4 file system");
MODULE_LICENSE("GPL");
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	/*
	3	* QNX4 file system, Linux implementation.
	4	*
	5	* Version : 0.2.1
	6	*
	7	* Using parts of the xiafs filesystem.
	8	*
	9	* History :
	10	*
	11	* 01-06-1998 by Richard Frowijn : first release.
	12	* 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc.
	13	* 30-06-1998 by Frank Denis : first step to write inodes.
	14	*/
	15
1da177e4	16	#include <linux/module.h>
1da177e4	17	#include <linux/init.h>
964f5369	18	#include <linux/slab.h>
1da177e4	19	#include <linux/highuid.h>
1da177e4 LT	20	#include <linux/pagemap.h>
1da177e4 LT	21	#include <linux/buffer_head.h>
79d25767	22	#include <linux/writeback.h>
964f5369	23	#include <linux/statfs.h>
6b91bfa1	24	#include <linux/fs_context.h>
964f5369	25	#include "qnx4.h"
1da177e4 LT	26
	27	#define QNX4_VERSION 4
	28	#define QNX4_BMNAME ".bitmap"
	29
ee9b6d61	30	static const struct super_operations qnx4_sops;
1da177e4	31
1da177e4	32	static struct inode qnx4_alloc_inode(struct super_block sb);
bc40ddd1	33	static void qnx4_free_inode(struct inode *inode);
726c3342	34	static int qnx4_statfs(struct dentry , struct kstatfs );
6b91bfa1	35	static int qnx4_get_tree(struct fs_context *fc);
1da177e4	36
ee9b6d61	37	static const struct super_operations qnx4_sops =
1da177e4 LT	38	{
1da177e4 LT	39	.alloc_inode = qnx4_alloc_inode,
bc40ddd1	40	.free_inode = qnx4_free_inode,
1da177e4	41	.statfs = qnx4_statfs,
1da177e4 LT	42	};
1da177e4 LT	43
6b91bfa1	44	static int qnx4_reconfigure(struct fs_context *fc)
1da177e4	45	{
6b91bfa1	46	struct super_block *sb = fc->root->d_sb;
1da177e4 LT	47	struct qnx4_sb_info *qs;
1da177e4 LT	48
02b9984d	49	sync_filesystem(sb);
1da177e4 LT	50	qs = qnx4_sb(sb);
1da177e4 LT	51	qs->Version = QNX4_VERSION;
6b91bfa1	52	fc->sb_flags \|= SB_RDONLY;
1da177e4 LT	53	return 0;
	54	}
	55
6b91bfa1 BD	56	static const struct fs_context_operations qnx4_context_opts = {
	57	.get_tree = qnx4_get_tree,
	58	.reconfigure = qnx4_reconfigure,
	59	};
	60
1da177e4 LT	61	static int qnx4_get_block( struct inode inode, sector_t iblock, struct buffer_head bh, int create )
	62	{
	63	unsigned long phys;
	64
891ddb95	65	QNX4DEBUG((KERN_INFO "qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
1da177e4 LT	66
	67	phys = qnx4_block_map( inode, iblock );
	68	if ( phys ) {
	69	// logical block is before EOF
	70	map_bh(bh, inode->i_sb, phys);
1da177e4 LT	71	}
	72	return 0;
	73	}
	74
7cd916f6 AV	75	static inline u32 try_extent(qnx4_xtnt_t extent, u32 offset)
	76	{
	77	u32 size = le32_to_cpu(extent->xtnt_size);
	78	if (*offset < size)
	79	return le32_to_cpu(extent->xtnt_blk) + *offset - 1;
	80	*offset -= size;
	81	return 0;
	82	}
	83
1da177e4 LT	84	unsigned long qnx4_block_map( struct inode *inode, long iblock )
	85	{
	86	int ix;
7cd916f6	87	long i_xblk;
1da177e4 LT	88	struct buffer_head *bh = NULL;
	89	struct qnx4_xblk *xblk = NULL;
	90	struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
75043cb5	91	u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
7cd916f6 AV	92	u32 offset = iblock;
7cd916f6 AV	93	u32 block = try_extent(&qnx4_inode->di_first_xtnt, &offset);
1da177e4	94
7cd916f6	95	if (block) {
1da177e4	96	// iblock is in the first extent. This is easy.
1da177e4 LT	97	} else {
	98	// iblock is beyond first extent. We have to follow the extent chain.
	99	i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
1da177e4 LT	100	ix = 0;
	101	while ( --nxtnt > 0 ) {
	102	if ( ix == 0 ) {
	103	// read next xtnt block.
	104	bh = sb_bread(inode->i_sb, i_xblk - 1);
	105	if ( !bh ) {
891ddb95	106	QNX4DEBUG((KERN_ERR "qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
1da177e4 LT	107	return -EIO;
	108	}
	109	xblk = (struct qnx4_xblk*)bh->b_data;
	110	if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
891ddb95	111	QNX4DEBUG((KERN_ERR "qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
1da177e4 LT	112	return -EIO;
	113	}
	114	}
7cd916f6 AV	115	block = try_extent(&xblk->xblk_xtnts[ix], &offset);
7cd916f6 AV	116	if (block) {
1da177e4	117	// got it!
1da177e4 LT	118	break;
1da177e4 LT	119	}
1da177e4 LT	120	if ( ++ix >= xblk->xblk_num_xtnts ) {
	121	i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
	122	ix = 0;
	123	brelse( bh );
	124	bh = NULL;
	125	}
	126	}
	127	if ( bh )
	128	brelse( bh );
	129	}
	130
891ddb95	131	QNX4DEBUG((KERN_INFO "qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
1da177e4 LT	132	return block;
	133	}
	134
726c3342	135	static int qnx4_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	136	{
726c3342	137	struct super_block *sb = dentry->d_sb;
5b76dc06	138	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
726c3342	139
1da177e4 LT	140	buf->f_type = sb->s_magic;
	141	buf->f_bsize = sb->s_blocksize;
	142	buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
	143	buf->f_bfree = qnx4_count_free_blocks(sb);
	144	buf->f_bavail = buf->f_bfree;
	145	buf->f_namelen = QNX4_NAME_MAX;
6d1349c7	146	buf->f_fsid = u64_to_fsid(id);
1da177e4	147
1da177e4 LT	148	return 0;
	149	}
	150
	151	/*
	152	* Check the root directory of the filesystem to make sure
	153	* it really _is_ a qnx4 filesystem, and to check the size
	154	* of the directory entry.
	155	*/
208adb64 AV	156	static const char qnx4_checkroot(struct super_block sb,
208adb64 AV	157	struct qnx4_super_block *s)
1da177e4 LT	158	{
	159	struct buffer_head *bh;
	160	struct qnx4_inode_entry *rootdir;
	161	int rd, rl;
	162	int i, j;
1da177e4	163
208adb64	164	if (s->RootDir.di_fname[0] != '/' \|\| s->RootDir.di_fname[1] != '\0')
1da177e4	165	return "no qnx4 filesystem (no root dir).";
4134bf81	166	QNX4DEBUG((KERN_NOTICE "QNX4 filesystem found on dev %s.\n", sb->s_id));
208adb64 AV	167	rd = le32_to_cpu(s->RootDir.di_first_xtnt.xtnt_blk) - 1;
208adb64 AV	168	rl = le32_to_cpu(s->RootDir.di_first_xtnt.xtnt_size);
4134bf81 AV	169	for (j = 0; j < rl; j++) {
	170	bh = sb_bread(sb, rd + j); /* root dir, first block */
	171	if (bh == NULL)
	172	return "unable to read root entry.";
	173	rootdir = (struct qnx4_inode_entry *) bh->b_data;
	174	for (i = 0; i < QNX4_INODES_PER_BLOCK; i++, rootdir++) {
	175	QNX4DEBUG((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname));
	176	if (strcmp(rootdir->di_fname, QNX4_BMNAME) != 0)
	177	continue;
	178	qnx4_sb(sb)->BitMap = kmemdup(rootdir,
	179	sizeof(struct qnx4_inode_entry),
	180	GFP_KERNEL);
1da177e4	181	brelse(bh);
4134bf81 AV	182	if (!qnx4_sb(sb)->BitMap)
	183	return "not enough memory for bitmap inode";
	184	/* keep bitmap inode known */
	185	return NULL;
1da177e4	186	}
4134bf81	187	brelse(bh);
1da177e4	188	}
4134bf81	189	return "bitmap file not found.";
1da177e4 LT	190	}
1da177e4 LT	191
6b91bfa1	192	static int qnx4_fill_super(struct super_block s, struct fs_context fc)
1da177e4 LT	193	{
	194	struct buffer_head *bh;
	195	struct inode *root;
	196	const char *errmsg;
	197	struct qnx4_sb_info *qs;
6b91bfa1	198	int silent = fc->sb_flags & SB_SILENT;
1da177e4	199
f8314dc6	200	qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
073c2141	201	if (!qs)
1da177e4 LT	202	return -ENOMEM;
1da177e4 LT	203	s->s_fs_info = qs;
1da177e4 LT	204
	205	sb_set_blocksize(s, QNX4_BLOCK_SIZE);
	206
208adb64 AV	207	s->s_op = &qnx4_sops;
208adb64 AV	208	s->s_magic = QNX4_SUPER_MAGIC;
1751e8a6	209	s->s_flags \|= SB_RDONLY; /* Yup, read-only yet */
22b13969 DD	210	s->s_time_min = 0;
22b13969 DD	211	s->s_time_max = U32_MAX;
208adb64	212
1da177e4 LT	213	/* Check the superblock signature. Since the qnx4 code is
	214	dangerous, we should leave as quickly as possible
	215	if we don't belong here... */
	216	bh = sb_bread(s, 1);
	217	if (!bh) {
891ddb95	218	printk(KERN_ERR "qnx4: unable to read the superblock\n");
208adb64	219	return -EINVAL;
1da177e4	220	}
1da177e4 LT	221
1da177e4 LT	222	/* check before allocating dentries, inodes, .. */
208adb64 AV	223	errmsg = qnx4_checkroot(s, (struct qnx4_super_block *) bh->b_data);
208adb64 AV	224	brelse(bh);
1da177e4	225	if (errmsg != NULL) {
6b91bfa1	226	if (!silent)
891ddb95	227	printk(KERN_ERR "qnx4: %s\n", errmsg);
208adb64	228	return -EINVAL;
1da177e4 LT	229	}
	230
	231	/* does root not have inode number QNX4_ROOT_INO ?? */
2b7e5bcb DH	232	root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
2b7e5bcb DH	233	if (IS_ERR(root)) {
891ddb95	234	printk(KERN_ERR "qnx4: get inode failed\n");
208adb64	235	return PTR_ERR(root);
1da177e4 LT	236	}
1da177e4 LT	237
48fde701	238	s->s_root = d_make_root(root);
1da177e4	239	if (s->s_root == NULL)
208adb64	240	return -ENOMEM;
1da177e4	241
1da177e4	242	return 0;
1da177e4 LT	243	}
1da177e4 LT	244
6b91bfa1 BD	245	static int qnx4_get_tree(struct fs_context *fc)
	246	{
	247	return get_tree_bdev(fc, qnx4_fill_super);
	248	}
	249
	250	static int qnx4_init_fs_context(struct fs_context *fc)
	251	{
	252	fc->ops = &qnx4_context_opts;
	253
	254	return 0;
	255	}
	256
208adb64	257	static void qnx4_kill_sb(struct super_block *sb)
1da177e4 LT	258	{
1da177e4 LT	259	struct qnx4_sb_info *qs = qnx4_sb(sb);
208adb64 AV	260	kill_block_super(sb);
	261	if (qs) {
	262	kfree(qs->BitMap);
	263	kfree(qs);
	264	}
1da177e4 LT	265	}
1da177e4 LT	266
2c69e205	267	static int qnx4_read_folio(struct file file, struct folio folio)
1da177e4	268	{
2c69e205	269	return block_read_full_folio(folio, qnx4_get_block);
1da177e4	270	}
f8706184	271
1da177e4 LT	272	static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
	273	{
	274	return generic_block_bmap(mapping,block,qnx4_get_block);
	275	}
2c69e205	276
f5e54d6e	277	static const struct address_space_operations qnx4_aops = {
2c69e205	278	.read_folio = qnx4_read_folio,
1da177e4 LT	279	.bmap = qnx4_bmap
	280	};
	281
2b7e5bcb	282	struct inode qnx4_iget(struct super_block sb, unsigned long ino)
1da177e4 LT	283	{
	284	struct buffer_head *bh;
	285	struct qnx4_inode_entry *raw_inode;
2b7e5bcb DH	286	int block;
	287	struct qnx4_inode_entry *qnx4_inode;
	288	struct inode *inode;
1da177e4	289
2b7e5bcb DH	290	inode = iget_locked(sb, ino);
	291	if (!inode)
	292	return ERR_PTR(-ENOMEM);
	293	if (!(inode->i_state & I_NEW))
	294	return inode;
	295
	296	qnx4_inode = qnx4_raw_inode(inode);
1da177e4 LT	297	inode->i_mode = 0;
1da177e4 LT	298
891ddb95	299	QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino));
1da177e4	300	if (!ino) {
2b7e5bcb DH	301	printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
2b7e5bcb DH	302	"out of range\n",
1da177e4	303	sb->s_id, ino);
2b7e5bcb DH	304	iget_failed(inode);
2b7e5bcb DH	305	return ERR_PTR(-EIO);
1da177e4 LT	306	}
	307	block = ino / QNX4_INODES_PER_BLOCK;
	308
	309	if (!(bh = sb_bread(sb, block))) {
891ddb95	310	printk(KERN_ERR "qnx4: major problem: unable to read inode from dev "
1da177e4	311	"%s\n", sb->s_id);
2b7e5bcb DH	312	iget_failed(inode);
2b7e5bcb DH	313	return ERR_PTR(-EIO);
1da177e4 LT	314	}
	315	raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
	316	(ino % QNX4_INODES_PER_BLOCK);
	317
	318	inode->i_mode = le16_to_cpu(raw_inode->di_mode);
511728d7 EB	319	i_uid_write(inode, (uid_t)le16_to_cpu(raw_inode->di_uid));
511728d7 EB	320	i_gid_write(inode, (gid_t)le16_to_cpu(raw_inode->di_gid));
bfe86848	321	set_nlink(inode, le16_to_cpu(raw_inode->di_nlink));
1da177e4	322	inode->i_size = le32_to_cpu(raw_inode->di_size);
55a75654 JL	323	inode_set_mtime(inode, le32_to_cpu(raw_inode->di_mtime), 0);
55a75654 JL	324	inode_set_atime(inode, le32_to_cpu(raw_inode->di_atime), 0);
bbe21298	325	inode_set_ctime(inode, le32_to_cpu(raw_inode->di_ctime), 0);
1da177e4	326	inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
1da177e4 LT	327
	328	memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
	329	if (S_ISREG(inode->i_mode)) {
945ffe54	330	inode->i_fop = &generic_ro_fops;
1da177e4 LT	331	inode->i_mapping->a_ops = &qnx4_aops;
	332	qnx4_i(inode)->mmu_private = inode->i_size;
	333	} else if (S_ISDIR(inode->i_mode)) {
	334	inode->i_op = &qnx4_dir_inode_operations;
	335	inode->i_fop = &qnx4_dir_operations;
	336	} else if (S_ISLNK(inode->i_mode)) {
	337	inode->i_op = &page_symlink_inode_operations;
21fc61c7	338	inode_nohighmem(inode);
1da177e4 LT	339	inode->i_mapping->a_ops = &qnx4_aops;
1da177e4 LT	340	qnx4_i(inode)->mmu_private = inode->i_size;
2b7e5bcb DH	341	} else {
	342	printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
	343	ino, sb->s_id);
	344	iget_failed(inode);
	345	brelse(bh);
	346	return ERR_PTR(-EIO);
	347	}
1da177e4	348	brelse(bh);
2b7e5bcb DH	349	unlock_new_inode(inode);
2b7e5bcb DH	350	return inode;
1da177e4 LT	351	}
1da177e4 LT	352
e18b890b	353	static struct kmem_cache *qnx4_inode_cachep;
1da177e4 LT	354
	355	static struct inode qnx4_alloc_inode(struct super_block sb)
	356	{
	357	struct qnx4_inode_info *ei;
fd60b288	358	ei = alloc_inode_sb(sb, qnx4_inode_cachep, GFP_KERNEL);
1da177e4 LT	359	if (!ei)
	360	return NULL;
	361	return &ei->vfs_inode;
	362	}
	363
bc40ddd1	364	static void qnx4_free_inode(struct inode *inode)
1da177e4 LT	365	{
	366	kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
	367	}
	368
51cc5068	369	static void init_once(void *foo)
1da177e4 LT	370	{
	371	struct qnx4_inode_info ei = (struct qnx4_inode_info ) foo;
	372
a35afb83	373	inode_init_once(&ei->vfs_inode);
1da177e4 LT	374	}
	375
	376	static int init_inodecache(void)
	377	{
	378	qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
	379	sizeof(struct qnx4_inode_info),
fffb60f9	380	0, (SLAB_RECLAIM_ACCOUNT\|
f88c3fb8	381	SLAB_ACCOUNT),
20c2df83	382	init_once);
1da177e4 LT	383	if (qnx4_inode_cachep == NULL)
	384	return -ENOMEM;
	385	return 0;
	386	}
	387
	388	static void destroy_inodecache(void)
	389	{
8c0a8537 KS	390	/*
	391	* Make sure all delayed rcu free inodes are flushed before we
	392	* destroy cache.
	393	*/
	394	rcu_barrier();
1a1d92c1	395	kmem_cache_destroy(qnx4_inode_cachep);
1da177e4 LT	396	}
1da177e4 LT	397
1da177e4	398	static struct file_system_type qnx4_fs_type = {
6b91bfa1 BD	399	.owner = THIS_MODULE,
	400	.name = "qnx4",
	401	.kill_sb = qnx4_kill_sb,
	402	.fs_flags = FS_REQUIRES_DEV,
	403	.init_fs_context = qnx4_init_fs_context,
1da177e4	404	};
7f78e035	405	MODULE_ALIAS_FS("qnx4");
1da177e4 LT	406
	407	static int __init init_qnx4_fs(void)
	408	{
	409	int err;
	410
	411	err = init_inodecache();
	412	if (err)
	413	return err;
	414
	415	err = register_filesystem(&qnx4_fs_type);
	416	if (err) {
	417	destroy_inodecache();
	418	return err;
	419	}
	420
891ddb95	421	printk(KERN_INFO "QNX4 filesystem 0.2.3 registered.\n");
1da177e4 LT	422	return 0;
	423	}
	424
	425	static void __exit exit_qnx4_fs(void)
	426	{
	427	unregister_filesystem(&qnx4_fs_type);
	428	destroy_inodecache();
	429	}
	430
	431	module_init(init_qnx4_fs)
	432	module_exit(exit_qnx4_fs)
d8fa3899	433	MODULE_DESCRIPTION("QNX4 file system");
1da177e4 LT	434	MODULE_LICENSE("GPL");
1da177e4 LT	435