[mirror_ubuntu-bionic-kernel.git] / fs / hfs / dir.c

/*
 *  linux/fs/hfs/dir.c
 *
 * Copyright (C) 1995-1997  Paul H. Hargrove
 * (C) 2003 Ardis Technologies <roman@ardistech.com>
 * This file may be distributed under the terms of the GNU General Public License.
 *
 * This file contains directory-related functions independent of which
 * scheme is being used to represent forks.
 *
 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
 */

#include "hfs_fs.h"
#include "btree.h"

/*
 * hfs_lookup()
 */
static struct dentry *hfs_lookup(struct inode *dir, struct dentry *dentry,
				 struct nameidata *nd)
{
	hfs_cat_rec rec;
	struct hfs_find_data fd;
	struct inode *inode = NULL;
	int res;

	dentry->d_op = &hfs_dentry_operations;

	hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
	hfs_cat_build_key(dir->i_sb, fd.search_key, dir->i_ino, &dentry->d_name);
	res = hfs_brec_read(&fd, &rec, sizeof(rec));
	if (res) {
		hfs_find_exit(&fd);
		if (res == -ENOENT) {
			/* No such entry */
			inode = NULL;
			goto done;
		}
		return ERR_PTR(res);
	}
	inode = hfs_iget(dir->i_sb, &fd.search_key->cat, &rec);
	hfs_find_exit(&fd);
	if (!inode)
		return ERR_PTR(-EACCES);
done:
	d_add(dentry, inode);
	return NULL;
}

/*
 * hfs_readdir
 */
static int hfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
	struct inode *inode = filp->f_path.dentry->d_inode;
	struct super_block *sb = inode->i_sb;
	int len, err;
	char strbuf[HFS_MAX_NAMELEN];
	union hfs_cat_rec entry;
	struct hfs_find_data fd;
	struct hfs_readdir_data *rd;
	u16 type;

	if (filp->f_pos >= inode->i_size)
		return 0;

	hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
	hfs_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
	err = hfs_brec_find(&fd);
	if (err)
		goto out;

	switch ((u32)filp->f_pos) {
	case 0:
		/* This is completely artificial... */
		if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR))
			goto out;
		filp->f_pos++;
		/* fall through */
	case 1:
		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
		if (entry.type != HFS_CDR_THD) {
			printk(KERN_ERR "hfs: bad catalog folder thread\n");
			err = -EIO;
			goto out;
		}
		//if (fd.entrylength < HFS_MIN_THREAD_SZ) {
		//	printk(KERN_ERR "hfs: truncated catalog thread\n");
		//	err = -EIO;
		//	goto out;
		//}
		if (filldir(dirent, "..", 2, 1,
			    be32_to_cpu(entry.thread.ParID), DT_DIR))
			goto out;
		filp->f_pos++;
		/* fall through */
	default:
		if (filp->f_pos >= inode->i_size)
			goto out;
		err = hfs_brec_goto(&fd, filp->f_pos - 1);
		if (err)
			goto out;
	}

	for (;;) {
		if (be32_to_cpu(fd.key->cat.ParID) != inode->i_ino) {
			printk(KERN_ERR "hfs: walked past end of dir\n");
			err = -EIO;
			goto out;
		}
		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
		type = entry.type;
		len = hfs_mac2asc(sb, strbuf, &fd.key->cat.CName);
		if (type == HFS_CDR_DIR) {
			if (fd.entrylength < sizeof(struct hfs_cat_dir)) {
				printk(KERN_ERR "hfs: small dir entry\n");
				err = -EIO;
				goto out;
			}
			if (filldir(dirent, strbuf, len, filp->f_pos,
				    be32_to_cpu(entry.dir.DirID), DT_DIR))
				break;
		} else if (type == HFS_CDR_FIL) {
			if (fd.entrylength < sizeof(struct hfs_cat_file)) {
				printk(KERN_ERR "hfs: small file entry\n");
				err = -EIO;
				goto out;
			}
			if (filldir(dirent, strbuf, len, filp->f_pos,
				    be32_to_cpu(entry.file.FlNum), DT_REG))
				break;
		} else {
			printk(KERN_ERR "hfs: bad catalog entry type %d\n", type);
			err = -EIO;
			goto out;
		}
		filp->f_pos++;
		if (filp->f_pos >= inode->i_size)
			goto out;
		err = hfs_brec_goto(&fd, 1);
		if (err)
			goto out;
	}
	rd = filp->private_data;
	if (!rd) {
		rd = kmalloc(sizeof(struct hfs_readdir_data), GFP_KERNEL);
		if (!rd) {
			err = -ENOMEM;
			goto out;
		}
		filp->private_data = rd;
		rd->file = filp;
		list_add(&rd->list, &HFS_I(inode)->open_dir_list);
	}
	memcpy(&rd->key, &fd.key, sizeof(struct hfs_cat_key));
out:
	hfs_find_exit(&fd);
	return err;
}

static int hfs_dir_release(struct inode *inode, struct file *file)
{
	struct hfs_readdir_data *rd = file->private_data;
	if (rd) {
		list_del(&rd->list);
		kfree(rd);
	}
	return 0;
}

/*
 * hfs_create()
 *
 * This is the create() entry in the inode_operations structure for
 * regular HFS directories.  The purpose is to create a new file in
 * a directory and return a corresponding inode, given the inode for
 * the directory and the name (and its length) of the new file.
 */
static int hfs_create(struct inode *dir, struct dentry *dentry, int mode,
		      struct nameidata *nd)
{
	struct inode *inode;
	int res;

	inode = hfs_new_inode(dir, &dentry->d_name, mode);
	if (!inode)
		return -ENOSPC;

	res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
	if (res) {
		inode->i_nlink = 0;
		hfs_delete_inode(inode);
		iput(inode);
		return res;
	}
	d_instantiate(dentry, inode);
	mark_inode_dirty(inode);
	return 0;
}

/*
 * hfs_mkdir()
 *
 * This is the mkdir() entry in the inode_operations structure for
 * regular HFS directories.  The purpose is to create a new directory
 * in a directory, given the inode for the parent directory and the
 * name (and its length) of the new directory.
 */
static int hfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
	struct inode *inode;
	int res;

	inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR | mode);
	if (!inode)
		return -ENOSPC;

	res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
	if (res) {
		inode->i_nlink = 0;
		hfs_delete_inode(inode);
		iput(inode);
		return res;
	}
	d_instantiate(dentry, inode);
	mark_inode_dirty(inode);
	return 0;
}

/*
 * hfs_unlink()
 *
 * This is the unlink() entry in the inode_operations structure for
 * regular HFS directories.  The purpose is to delete an existing
 * file, given the inode for the parent directory and the name
 * (and its length) of the existing file.
 */
static int hfs_unlink(struct inode *dir, struct dentry *dentry)
{
	struct inode *inode;
	int res;

	inode = dentry->d_inode;
	res = hfs_cat_delete(inode->i_ino, dir, &dentry->d_name);
	if (res)
		return res;

	drop_nlink(inode);
	hfs_delete_inode(inode);
	inode->i_ctime = CURRENT_TIME_SEC;
	mark_inode_dirty(inode);

	return res;
}

/*
 * hfs_rmdir()
 *
 * This is the rmdir() entry in the inode_operations structure for
 * regular HFS directories.  The purpose is to delete an existing
 * directory, given the inode for the parent directory and the name
 * (and its length) of the existing directory.
 */
static int hfs_rmdir(struct inode *dir, struct dentry *dentry)
{
	struct inode *inode;
	int res;

	inode = dentry->d_inode;
	if (inode->i_size != 2)
		return -ENOTEMPTY;
	res = hfs_cat_delete(inode->i_ino, dir, &dentry->d_name);
	if (res)
		return res;
	clear_nlink(inode);
	inode->i_ctime = CURRENT_TIME_SEC;
	hfs_delete_inode(inode);
	mark_inode_dirty(inode);
	return 0;
}

/*
 * hfs_rename()
 *
 * This is the rename() entry in the inode_operations structure for
 * regular HFS directories.  The purpose is to rename an existing
 * file or directory, given the inode for the current directory and
 * the name (and its length) of the existing file/directory and the
 * inode for the new directory and the name (and its length) of the
 * new file/directory.
 * XXX: how do you handle must_be dir?
 */
static int hfs_rename(struct inode *old_dir, struct dentry *old_dentry,
		      struct inode *new_dir, struct dentry *new_dentry)
{
	int res;

	/* Unlink destination if it already exists */
	if (new_dentry->d_inode) {
		res = hfs_unlink(new_dir, new_dentry);
		if (res)
			return res;
	}

	res = hfs_cat_move(old_dentry->d_inode->i_ino,
			   old_dir, &old_dentry->d_name,
			   new_dir, &new_dentry->d_name);
	if (!res)
		hfs_cat_build_key(old_dir->i_sb,
				  (btree_key *)&HFS_I(old_dentry->d_inode)->cat_key,
				  new_dir->i_ino, &new_dentry->d_name);
	return res;
}

const struct file_operations hfs_dir_operations = {
	.read		= generic_read_dir,
	.readdir	= hfs_readdir,
	.llseek		= generic_file_llseek,
	.release	= hfs_dir_release,
};

const struct inode_operations hfs_dir_inode_operations = {
	.create		= hfs_create,
	.lookup		= hfs_lookup,
	.unlink		= hfs_unlink,
	.mkdir		= hfs_mkdir,
	.rmdir		= hfs_rmdir,
	.rename		= hfs_rename,
	.setattr	= hfs_inode_setattr,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/hfs/dir.c
	3	*
	4	* Copyright (C) 1995-1997 Paul H. Hargrove
	5	* (C) 2003 Ardis Technologies <roman@ardistech.com>
	6	* This file may be distributed under the terms of the GNU General Public License.
	7	*
	8	* This file contains directory-related functions independent of which
	9	* scheme is being used to represent forks.
	10	*
	11	* Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
	12	*/
	13
	14	#include "hfs_fs.h"
	15	#include "btree.h"
	16
	17	/*
	18	* hfs_lookup()
	19	*/
	20	static struct dentry hfs_lookup(struct inode dir, struct dentry *dentry,
	21	struct nameidata *nd)
	22	{
	23	hfs_cat_rec rec;
	24	struct hfs_find_data fd;
	25	struct inode *inode = NULL;
	26	int res;
	27
	28	dentry->d_op = &hfs_dentry_operations;
	29
	30	hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
328b9227	31	hfs_cat_build_key(dir->i_sb, fd.search_key, dir->i_ino, &dentry->d_name);
1da177e4 LT	32	res = hfs_brec_read(&fd, &rec, sizeof(rec));
	33	if (res) {
	34	hfs_find_exit(&fd);
	35	if (res == -ENOENT) {
	36	/* No such entry */
	37	inode = NULL;
	38	goto done;
	39	}
	40	return ERR_PTR(res);
	41	}
	42	inode = hfs_iget(dir->i_sb, &fd.search_key->cat, &rec);
	43	hfs_find_exit(&fd);
	44	if (!inode)
	45	return ERR_PTR(-EACCES);
	46	done:
	47	d_add(dentry, inode);
	48	return NULL;
	49	}
	50
	51	/*
	52	* hfs_readdir
	53	*/
	54	static int hfs_readdir(struct file filp, void dirent, filldir_t filldir)
	55	{
c5288960	56	struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4 LT	57	struct super_block *sb = inode->i_sb;
1da177e4 LT	58	int len, err;
328b9227	59	char strbuf[HFS_MAX_NAMELEN];
1da177e4 LT	60	union hfs_cat_rec entry;
	61	struct hfs_find_data fd;
	62	struct hfs_readdir_data *rd;
	63	u16 type;
	64
	65	if (filp->f_pos >= inode->i_size)
	66	return 0;
	67
	68	hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
328b9227	69	hfs_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
1da177e4 LT	70	err = hfs_brec_find(&fd);
	71	if (err)
	72	goto out;
	73
	74	switch ((u32)filp->f_pos) {
	75	case 0:
	76	/* This is completely artificial... */
	77	if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR))
	78	goto out;
	79	filp->f_pos++;
	80	/* fall through */
	81	case 1:
	82	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
	83	if (entry.type != HFS_CDR_THD) {
7cf3cc30	84	printk(KERN_ERR "hfs: bad catalog folder thread\n");
1da177e4 LT	85	err = -EIO;
	86	goto out;
	87	}
	88	//if (fd.entrylength < HFS_MIN_THREAD_SZ) {
7cf3cc30	89	// printk(KERN_ERR "hfs: truncated catalog thread\n");
1da177e4 LT	90	// err = -EIO;
	91	// goto out;
	92	//}
	93	if (filldir(dirent, "..", 2, 1,
	94	be32_to_cpu(entry.thread.ParID), DT_DIR))
	95	goto out;
	96	filp->f_pos++;
	97	/* fall through */
	98	default:
	99	if (filp->f_pos >= inode->i_size)
	100	goto out;
	101	err = hfs_brec_goto(&fd, filp->f_pos - 1);
	102	if (err)
	103	goto out;
	104	}
	105
	106	for (;;) {
	107	if (be32_to_cpu(fd.key->cat.ParID) != inode->i_ino) {
7cf3cc30	108	printk(KERN_ERR "hfs: walked past end of dir\n");
1da177e4 LT	109	err = -EIO;
	110	goto out;
	111	}
	112	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
	113	type = entry.type;
328b9227	114	len = hfs_mac2asc(sb, strbuf, &fd.key->cat.CName);
1da177e4 LT	115	if (type == HFS_CDR_DIR) {
1da177e4 LT	116	if (fd.entrylength < sizeof(struct hfs_cat_dir)) {
7cf3cc30	117	printk(KERN_ERR "hfs: small dir entry\n");
1da177e4 LT	118	err = -EIO;
	119	goto out;
	120	}
	121	if (filldir(dirent, strbuf, len, filp->f_pos,
	122	be32_to_cpu(entry.dir.DirID), DT_DIR))
	123	break;
	124	} else if (type == HFS_CDR_FIL) {
	125	if (fd.entrylength < sizeof(struct hfs_cat_file)) {
7cf3cc30	126	printk(KERN_ERR "hfs: small file entry\n");
1da177e4 LT	127	err = -EIO;
	128	goto out;
	129	}
	130	if (filldir(dirent, strbuf, len, filp->f_pos,
	131	be32_to_cpu(entry.file.FlNum), DT_REG))
	132	break;
	133	} else {
7cf3cc30	134	printk(KERN_ERR "hfs: bad catalog entry type %d\n", type);
1da177e4 LT	135	err = -EIO;
	136	goto out;
	137	}
	138	filp->f_pos++;
	139	if (filp->f_pos >= inode->i_size)
	140	goto out;
	141	err = hfs_brec_goto(&fd, 1);
	142	if (err)
	143	goto out;
	144	}
	145	rd = filp->private_data;
	146	if (!rd) {
	147	rd = kmalloc(sizeof(struct hfs_readdir_data), GFP_KERNEL);
	148	if (!rd) {
	149	err = -ENOMEM;
	150	goto out;
	151	}
	152	filp->private_data = rd;
	153	rd->file = filp;
	154	list_add(&rd->list, &HFS_I(inode)->open_dir_list);
	155	}
	156	memcpy(&rd->key, &fd.key, sizeof(struct hfs_cat_key));
	157	out:
	158	hfs_find_exit(&fd);
	159	return err;
	160	}
	161
	162	static int hfs_dir_release(struct inode inode, struct file file)
	163	{
	164	struct hfs_readdir_data *rd = file->private_data;
	165	if (rd) {
	166	list_del(&rd->list);
	167	kfree(rd);
	168	}
	169	return 0;
	170	}
	171
	172	/*
	173	* hfs_create()
	174	*
	175	* This is the create() entry in the inode_operations structure for
	176	* regular HFS directories. The purpose is to create a new file in
	177	* a directory and return a corresponding inode, given the inode for
	178	* the directory and the name (and its length) of the new file.
	179	*/
	180	static int hfs_create(struct inode dir, struct dentry dentry, int mode,
	181	struct nameidata *nd)
	182	{
	183	struct inode *inode;
	184	int res;
	185
	186	inode = hfs_new_inode(dir, &dentry->d_name, mode);
	187	if (!inode)
	188	return -ENOSPC;
	189
	190	res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
	191	if (res) {
	192	inode->i_nlink = 0;
	193	hfs_delete_inode(inode);
	194	iput(inode);
	195	return res;
	196	}
	197	d_instantiate(dentry, inode);
	198	mark_inode_dirty(inode);
199	return 0;
200	}
201
202	/*
203	* hfs_mkdir()
204	*
205	* This is the mkdir() entry in the inode_operations structure for
206	* regular HFS directories. The purpose is to create a new directory
207	* in a directory, given the inode for the parent directory and the
208	* name (and its length) of the new directory.
209	*/
210	static int hfs_mkdir(struct inode dir, struct dentry dentry, int mode)
211	{
212	struct inode *inode;
213	int res;
214
215	inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR \| mode);
216	if (!inode)
217	return -ENOSPC;
218
219	res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
220	if (res) {
221	inode->i_nlink = 0;
222	hfs_delete_inode(inode);
223	iput(inode);
224	return res;
225	}
226	d_instantiate(dentry, inode);
227	mark_inode_dirty(inode);
228	return 0;
229	}
230
231	/*
232	* hfs_unlink()
233	*
234	* This is the unlink() entry in the inode_operations structure for
235	* regular HFS directories. The purpose is to delete an existing
236	* file, given the inode for the parent directory and the name
237	* (and its length) of the existing file.
238	*/
239	static int hfs_unlink(struct inode dir, struct dentry dentry)
240	{
241	struct inode *inode;
242	int res;
243
244	inode = dentry->d_inode;
245	res = hfs_cat_delete(inode->i_ino, dir, &dentry->d_name);
246	if (res)
247	return res;
248
9a53c3a7	249	drop_nlink(inode);
1da177e4 LT	250	hfs_delete_inode(inode);
	251	inode->i_ctime = CURRENT_TIME_SEC;
	252	mark_inode_dirty(inode);
	253
	254	return res;
	255	}
	256
	257	/*
	258	* hfs_rmdir()
	259	*
	260	* This is the rmdir() entry in the inode_operations structure for
	261	* regular HFS directories. The purpose is to delete an existing
	262	* directory, given the inode for the parent directory and the name
	263	* (and its length) of the existing directory.
	264	*/
	265	static int hfs_rmdir(struct inode dir, struct dentry dentry)
	266	{
	267	struct inode *inode;
	268	int res;
	269
	270	inode = dentry->d_inode;
	271	if (inode->i_size != 2)
	272	return -ENOTEMPTY;
	273	res = hfs_cat_delete(inode->i_ino, dir, &dentry->d_name);
	274	if (res)
	275	return res;
ce71ec36	276	clear_nlink(inode);
1da177e4 LT	277	inode->i_ctime = CURRENT_TIME_SEC;
	278	hfs_delete_inode(inode);
	279	mark_inode_dirty(inode);
	280	return 0;
	281	}
	282
	283	/*
	284	* hfs_rename()
	285	*
	286	* This is the rename() entry in the inode_operations structure for
	287	* regular HFS directories. The purpose is to rename an existing
	288	* file or directory, given the inode for the current directory and
	289	* the name (and its length) of the existing file/directory and the
	290	* inode for the new directory and the name (and its length) of the
	291	* new file/directory.
	292	* XXX: how do you handle must_be dir?
	293	*/
	294	static int hfs_rename(struct inode old_dir, struct dentry old_dentry,
	295	struct inode new_dir, struct dentry new_dentry)
	296	{
	297	int res;
	298
	299	/* Unlink destination if it already exists */
	300	if (new_dentry->d_inode) {
	301	res = hfs_unlink(new_dir, new_dentry);
	302	if (res)
	303	return res;
	304	}
	305
	306	res = hfs_cat_move(old_dentry->d_inode->i_ino,
	307	old_dir, &old_dentry->d_name,
	308	new_dir, &new_dentry->d_name);
	309	if (!res)
328b9227 RZ	310	hfs_cat_build_key(old_dir->i_sb,
328b9227 RZ	311	(btree_key *)&HFS_I(old_dentry->d_inode)->cat_key,
1da177e4 LT	312	new_dir->i_ino, &new_dentry->d_name);
	313	return res;
	314	}
	315
4b6f5d20	316	const struct file_operations hfs_dir_operations = {
1da177e4 LT	317	.read = generic_read_dir,
	318	.readdir = hfs_readdir,
	319	.llseek = generic_file_llseek,
	320	.release = hfs_dir_release,
	321	};
	322
92e1d5be	323	const struct inode_operations hfs_dir_inode_operations = {
1da177e4 LT	324	.create = hfs_create,
	325	.lookup = hfs_lookup,
	326	.unlink = hfs_unlink,
	327	.mkdir = hfs_mkdir,
	328	.rmdir = hfs_rmdir,
	329	.rename = hfs_rename,
	330	.setattr = hfs_inode_setattr,
	331	};