[net-next-2.6.git] / fs / hfsplus / dir.c

/*
 *  linux/fs/hfsplus/dir.c
 *
 * Copyright (C) 2001
 * Brad Boyer (flar@allandria.com)
 * (C) 2003 Ardis Technologies <roman@ardistech.com>
 *
 * Handling of directories
 */

#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/random.h>

#include "hfsplus_fs.h"
#include "hfsplus_raw.h"

static inline void hfsplus_instantiate(struct dentry *dentry,
				       struct inode *inode, u32 cnid)
{
	dentry->d_fsdata = (void *)(unsigned long)cnid;
	d_instantiate(dentry, inode);
}

/* Find the entry inside dir named dentry->d_name */
static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,
				     struct nameidata *nd)
{
	struct inode *inode = NULL;
	struct hfs_find_data fd;
	struct super_block *sb;
	hfsplus_cat_entry entry;
	int err;
	u32 cnid, linkid = 0;
	u16 type;

	sb = dir->i_sb;

	dentry->d_op = &hfsplus_dentry_operations;
	dentry->d_fsdata = NULL;
	hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
	hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name);
again:
	err = hfs_brec_read(&fd, &entry, sizeof(entry));
	if (err) {
		if (err == -ENOENT) {
			hfs_find_exit(&fd);
			/* No such entry */
			inode = NULL;
			goto out;
		}
		goto fail;
	}
	type = be16_to_cpu(entry.type);
	if (type == HFSPLUS_FOLDER) {
		if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
			err = -EIO;
			goto fail;
		}
		cnid = be32_to_cpu(entry.folder.id);
		dentry->d_fsdata = (void *)(unsigned long)cnid;
	} else if (type == HFSPLUS_FILE) {
		if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
			err = -EIO;
			goto fail;
		}
		cnid = be32_to_cpu(entry.file.id);
		if (entry.file.user_info.fdType == cpu_to_be32(HFSP_HARDLINK_TYPE) &&
		    entry.file.user_info.fdCreator == cpu_to_be32(HFSP_HFSPLUS_CREATOR) &&
		    (entry.file.create_date == HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)->create_date ||
		     entry.file.create_date == HFSPLUS_I(sb->s_root->d_inode)->create_date) &&
		    HFSPLUS_SB(sb)->hidden_dir) {
			struct qstr str;
			char name[32];

			if (dentry->d_fsdata) {
				/*
				 * We found a link pointing to another link,
				 * so ignore it and treat it as regular file.
				 */
				cnid = (unsigned long)dentry->d_fsdata;
				linkid = 0;
			} else {
				dentry->d_fsdata = (void *)(unsigned long)cnid;
				linkid = be32_to_cpu(entry.file.permissions.dev);
				str.len = sprintf(name, "iNode%d", linkid);
				str.name = name;
				hfsplus_cat_build_key(sb, fd.search_key,
					HFSPLUS_SB(sb)->hidden_dir->i_ino, &str);
				goto again;
			}
		} else if (!dentry->d_fsdata)
			dentry->d_fsdata = (void *)(unsigned long)cnid;
	} else {
		printk(KERN_ERR "hfs: invalid catalog entry type in lookup\n");
		err = -EIO;
		goto fail;
	}
	hfs_find_exit(&fd);
	inode = hfsplus_iget(dir->i_sb, cnid);
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (S_ISREG(inode->i_mode))
		HFSPLUS_I(inode)->linkid = linkid;
out:
	d_add(dentry, inode);
	return NULL;
fail:
	hfs_find_exit(&fd);
	return ERR_PTR(err);
}

static int hfsplus_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[HFSPLUS_MAX_STRLEN + 1];
	hfsplus_cat_entry entry;
	struct hfs_find_data fd;
	struct hfsplus_readdir_data *rd;
	u16 type;

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

	hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
	hfsplus_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 (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
			printk(KERN_ERR "hfs: bad catalog folder thread\n");
			err = -EIO;
			goto out;
		}
		if (fd.entrylength < HFSPLUS_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.parentID), 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.parent) != 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 = be16_to_cpu(entry.type);
		len = HFSPLUS_MAX_STRLEN;
		err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len);
		if (err)
			goto out;
		if (type == HFSPLUS_FOLDER) {
			if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
				printk(KERN_ERR "hfs: small dir entry\n");
				err = -EIO;
				goto out;
			}
			if (HFSPLUS_SB(sb)->hidden_dir &&
			    HFSPLUS_SB(sb)->hidden_dir->i_ino ==
					be32_to_cpu(entry.folder.id))
				goto next;
			if (filldir(dirent, strbuf, len, filp->f_pos,
				    be32_to_cpu(entry.folder.id), DT_DIR))
				break;
		} else if (type == HFSPLUS_FILE) {
			if (fd.entrylength < sizeof(struct hfsplus_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.id), DT_REG))
				break;
		} else {
			printk(KERN_ERR "hfs: bad catalog entry type\n");
			err = -EIO;
			goto out;
		}
	next:
		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 hfsplus_readdir_data), GFP_KERNEL);
		if (!rd) {
			err = -ENOMEM;
			goto out;
		}
		filp->private_data = rd;
		rd->file = filp;
		list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
	}
	memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
out:
	hfs_find_exit(&fd);
	return err;
}

static int hfsplus_dir_release(struct inode *inode, struct file *file)
{
	struct hfsplus_readdir_data *rd = file->private_data;
	if (rd) {
		mutex_lock(&inode->i_mutex);
		list_del(&rd->list);
		mutex_unlock(&inode->i_mutex);
		kfree(rd);
	}
	return 0;
}

static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir,
			struct dentry *dst_dentry)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb);
	struct inode *inode = src_dentry->d_inode;
	struct inode *src_dir = src_dentry->d_parent->d_inode;
	struct qstr str;
	char name[32];
	u32 cnid, id;
	int res;

	if (HFSPLUS_IS_RSRC(inode))
		return -EPERM;
	if (!S_ISREG(inode->i_mode))
		return -EPERM;

	mutex_lock(&sbi->vh_mutex);
	if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
		for (;;) {
			get_random_bytes(&id, sizeof(cnid));
			id &= 0x3fffffff;
			str.name = name;
			str.len = sprintf(name, "iNode%d", id);
			res = hfsplus_rename_cat(inode->i_ino,
						 src_dir, &src_dentry->d_name,
						 sbi->hidden_dir, &str);
			if (!res)
				break;
			if (res != -EEXIST)
				goto out;
		}
		HFSPLUS_I(inode)->linkid = id;
		cnid = sbi->next_cnid++;
		src_dentry->d_fsdata = (void *)(unsigned long)cnid;
		res = hfsplus_create_cat(cnid, src_dir, &src_dentry->d_name, inode);
		if (res)
			/* panic? */
			goto out;
		sbi->file_count++;
	}
	cnid = sbi->next_cnid++;
	res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
	if (res)
		goto out;

	inc_nlink(inode);
	hfsplus_instantiate(dst_dentry, inode, cnid);
	ihold(inode);
	inode->i_ctime = CURRENT_TIME_SEC;
	mark_inode_dirty(inode);
	sbi->file_count++;
	dst_dir->i_sb->s_dirt = 1;
out:
	mutex_unlock(&sbi->vh_mutex);
	return res;
}

static int hfsplus_unlink(struct inode *dir, struct dentry *dentry)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
	struct inode *inode = dentry->d_inode;
	struct qstr str;
	char name[32];
	u32 cnid;
	int res;

	if (HFSPLUS_IS_RSRC(inode))
		return -EPERM;

	mutex_lock(&sbi->vh_mutex);
	cnid = (u32)(unsigned long)dentry->d_fsdata;
	if (inode->i_ino == cnid &&
	    atomic_read(&HFSPLUS_I(inode)->opencnt)) {
		str.name = name;
		str.len = sprintf(name, "temp%lu", inode->i_ino);
		res = hfsplus_rename_cat(inode->i_ino,
					 dir, &dentry->d_name,
					 sbi->hidden_dir, &str);
		if (!res) {
			inode->i_flags |= S_DEAD;
			drop_nlink(inode);
		}
		goto out;
	}
	res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
	if (res)
		goto out;

	if (inode->i_nlink > 0)
		drop_nlink(inode);
	if (inode->i_ino == cnid)
		clear_nlink(inode);
	if (!inode->i_nlink) {
		if (inode->i_ino != cnid) {
			sbi->file_count--;
			if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) {
				res = hfsplus_delete_cat(inode->i_ino,
							 sbi->hidden_dir,
							 NULL);
				if (!res)
					hfsplus_delete_inode(inode);
			} else
				inode->i_flags |= S_DEAD;
		} else
			hfsplus_delete_inode(inode);
	} else
		sbi->file_count--;
	inode->i_ctime = CURRENT_TIME_SEC;
	mark_inode_dirty(inode);
out:
	mutex_unlock(&sbi->vh_mutex);
	return res;
}

static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
	struct inode *inode = dentry->d_inode;
	int res;

	if (inode->i_size != 2)
		return -ENOTEMPTY;

	mutex_lock(&sbi->vh_mutex);
	res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
	if (res)
		goto out;
	clear_nlink(inode);
	inode->i_ctime = CURRENT_TIME_SEC;
	hfsplus_delete_inode(inode);
	mark_inode_dirty(inode);
out:
	mutex_unlock(&sbi->vh_mutex);
	return res;
}

static int hfsplus_symlink(struct inode *dir, struct dentry *dentry,
			   const char *symname)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
	struct inode *inode;
	int res = -ENOSPC;

	mutex_lock(&sbi->vh_mutex);
	inode = hfsplus_new_inode(dir->i_sb, S_IFLNK | S_IRWXUGO);
	if (!inode)
		goto out;

	res = page_symlink(inode, symname, strlen(symname) + 1);
	if (res)
		goto out_err;

	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
	if (res)
		goto out_err;

	hfsplus_instantiate(dentry, inode, inode->i_ino);
	mark_inode_dirty(inode);
	goto out;

out_err:
	inode->i_nlink = 0;
	hfsplus_delete_inode(inode);
	iput(inode);
out:
	mutex_unlock(&sbi->vh_mutex);
	return res;
}

static int hfsplus_mknod(struct inode *dir, struct dentry *dentry,
			 int mode, dev_t rdev)
{
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
	struct inode *inode;
	int res = -ENOSPC;

	mutex_lock(&sbi->vh_mutex);
	inode = hfsplus_new_inode(dir->i_sb, mode);
	if (!inode)
		goto out;

	if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode))
		init_special_inode(inode, mode, rdev);

	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
	if (res) {
		inode->i_nlink = 0;
		hfsplus_delete_inode(inode);
		iput(inode);
		goto out;
	}

	hfsplus_instantiate(dentry, inode, inode->i_ino);
	mark_inode_dirty(inode);
out:
	mutex_unlock(&sbi->vh_mutex);
	return res;
}

static int hfsplus_create(struct inode *dir, struct dentry *dentry, int mode,
			  struct nameidata *nd)
{
	return hfsplus_mknod(dir, dentry, mode, 0);
}

static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
	return hfsplus_mknod(dir, dentry, mode | S_IFDIR, 0);
}

static int hfsplus_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) {
		if (S_ISDIR(new_dentry->d_inode->i_mode))
			res = hfsplus_rmdir(new_dir, new_dentry);
		else
			res = hfsplus_unlink(new_dir, new_dentry);
		if (res)
			return res;
	}

	res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
				 old_dir, &old_dentry->d_name,
				 new_dir, &new_dentry->d_name);
	if (!res)
		new_dentry->d_fsdata = old_dentry->d_fsdata;
	return res;
}

const struct inode_operations hfsplus_dir_inode_operations = {
	.lookup		= hfsplus_lookup,
	.create		= hfsplus_create,
	.link		= hfsplus_link,
	.unlink		= hfsplus_unlink,
	.mkdir		= hfsplus_mkdir,
	.rmdir		= hfsplus_rmdir,
	.symlink	= hfsplus_symlink,
	.mknod		= hfsplus_mknod,
	.rename		= hfsplus_rename,
};

const struct file_operations hfsplus_dir_operations = {
	.read		= generic_read_dir,
	.readdir	= hfsplus_readdir,
	.unlocked_ioctl = hfsplus_ioctl,
	.llseek		= generic_file_llseek,
	.release	= hfsplus_dir_release,
};
Commit	Line	Data
	1	/*
	2	* linux/fs/hfsplus/dir.c
	3	*
	4	* Copyright (C) 2001
	5	* Brad Boyer (flar@allandria.com)
	6	* (C) 2003 Ardis Technologies <roman@ardistech.com>
	7	*
	8	* Handling of directories
	9	*/
	10
	11	#include <linux/errno.h>
	12	#include <linux/fs.h>
	13	#include <linux/slab.h>
	14	#include <linux/random.h>
	15
	16	#include "hfsplus_fs.h"
	17	#include "hfsplus_raw.h"
	18
	19	static inline void hfsplus_instantiate(struct dentry *dentry,
	20	struct inode *inode, u32 cnid)
	21	{
	22	dentry->d_fsdata = (void *)(unsigned long)cnid;
	23	d_instantiate(dentry, inode);
	24	}
	25
	26	/* Find the entry inside dir named dentry->d_name */
	27	static struct dentry hfsplus_lookup(struct inode dir, struct dentry *dentry,
	28	struct nameidata *nd)
	29	{
	30	struct inode *inode = NULL;
	31	struct hfs_find_data fd;
	32	struct super_block *sb;
	33	hfsplus_cat_entry entry;
	34	int err;
	35	u32 cnid, linkid = 0;
	36	u16 type;
	37
	38	sb = dir->i_sb;
	39
	40	dentry->d_op = &hfsplus_dentry_operations;
	41	dentry->d_fsdata = NULL;
	42	hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
	43	hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name);
	44	again:
	45	err = hfs_brec_read(&fd, &entry, sizeof(entry));
	46	if (err) {
	47	if (err == -ENOENT) {
	48	hfs_find_exit(&fd);
	49	/* No such entry */
	50	inode = NULL;
	51	goto out;
	52	}
	53	goto fail;
	54	}
	55	type = be16_to_cpu(entry.type);
	56	if (type == HFSPLUS_FOLDER) {
	57	if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
	58	err = -EIO;
	59	goto fail;
	60	}
	61	cnid = be32_to_cpu(entry.folder.id);
	62	dentry->d_fsdata = (void *)(unsigned long)cnid;
	63	} else if (type == HFSPLUS_FILE) {
	64	if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
	65	err = -EIO;
	66	goto fail;
	67	}
	68	cnid = be32_to_cpu(entry.file.id);
	69	if (entry.file.user_info.fdType == cpu_to_be32(HFSP_HARDLINK_TYPE) &&
	70	entry.file.user_info.fdCreator == cpu_to_be32(HFSP_HFSPLUS_CREATOR) &&
	71	(entry.file.create_date == HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)->create_date \|\|
	72	entry.file.create_date == HFSPLUS_I(sb->s_root->d_inode)->create_date) &&
	73	HFSPLUS_SB(sb)->hidden_dir) {
	74	struct qstr str;
	75	char name[32];
	76
	77	if (dentry->d_fsdata) {
	78	/*
	79	* We found a link pointing to another link,
	80	* so ignore it and treat it as regular file.
	81	*/
	82	cnid = (unsigned long)dentry->d_fsdata;
	83	linkid = 0;
	84	} else {
	85	dentry->d_fsdata = (void *)(unsigned long)cnid;
	86	linkid = be32_to_cpu(entry.file.permissions.dev);
	87	str.len = sprintf(name, "iNode%d", linkid);
	88	str.name = name;
	89	hfsplus_cat_build_key(sb, fd.search_key,
	90	HFSPLUS_SB(sb)->hidden_dir->i_ino, &str);
	91	goto again;
	92	}
	93	} else if (!dentry->d_fsdata)
	94	dentry->d_fsdata = (void *)(unsigned long)cnid;
	95	} else {
	96	printk(KERN_ERR "hfs: invalid catalog entry type in lookup\n");
	97	err = -EIO;
	98	goto fail;
	99	}
	100	hfs_find_exit(&fd);
	101	inode = hfsplus_iget(dir->i_sb, cnid);
	102	if (IS_ERR(inode))
	103	return ERR_CAST(inode);
	104	if (S_ISREG(inode->i_mode))
	105	HFSPLUS_I(inode)->linkid = linkid;
	106	out:
	107	d_add(dentry, inode);
	108	return NULL;
	109	fail:
	110	hfs_find_exit(&fd);
	111	return ERR_PTR(err);
	112	}
	113
	114	static int hfsplus_readdir(struct file filp, void dirent, filldir_t filldir)
	115	{
	116	struct inode *inode = filp->f_path.dentry->d_inode;
	117	struct super_block *sb = inode->i_sb;
	118	int len, err;
	119	char strbuf[HFSPLUS_MAX_STRLEN + 1];
	120	hfsplus_cat_entry entry;
	121	struct hfs_find_data fd;
	122	struct hfsplus_readdir_data *rd;
	123	u16 type;
	124
	125	if (filp->f_pos >= inode->i_size)
	126	return 0;
	127
	128	hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
	129	hfsplus_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
	130	err = hfs_brec_find(&fd);
	131	if (err)
	132	goto out;
	133
	134	switch ((u32)filp->f_pos) {
	135	case 0:
	136	/* This is completely artificial... */
	137	if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR))
	138	goto out;
	139	filp->f_pos++;
	140	/* fall through */
	141	case 1:
	142	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
	143	if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
	144	printk(KERN_ERR "hfs: bad catalog folder thread\n");
	145	err = -EIO;
	146	goto out;
	147	}
	148	if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
	149	printk(KERN_ERR "hfs: truncated catalog thread\n");
	150	err = -EIO;
	151	goto out;
	152	}
	153	if (filldir(dirent, "..", 2, 1,
	154	be32_to_cpu(entry.thread.parentID), DT_DIR))
	155	goto out;
	156	filp->f_pos++;
	157	/* fall through */
	158	default:
	159	if (filp->f_pos >= inode->i_size)
	160	goto out;
	161	err = hfs_brec_goto(&fd, filp->f_pos - 1);
	162	if (err)
	163	goto out;
	164	}
	165
	166	for (;;) {
	167	if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
	168	printk(KERN_ERR "hfs: walked past end of dir\n");
	169	err = -EIO;
	170	goto out;
	171	}
	172	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
	173	type = be16_to_cpu(entry.type);
	174	len = HFSPLUS_MAX_STRLEN;
	175	err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len);
	176	if (err)
	177	goto out;
	178	if (type == HFSPLUS_FOLDER) {
	179	if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
	180	printk(KERN_ERR "hfs: small dir entry\n");
	181	err = -EIO;
	182	goto out;
	183	}
	184	if (HFSPLUS_SB(sb)->hidden_dir &&
	185	HFSPLUS_SB(sb)->hidden_dir->i_ino ==
	186	be32_to_cpu(entry.folder.id))
	187	goto next;
	188	if (filldir(dirent, strbuf, len, filp->f_pos,
	189	be32_to_cpu(entry.folder.id), DT_DIR))
	190	break;
	191	} else if (type == HFSPLUS_FILE) {
	192	if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
	193	printk(KERN_ERR "hfs: small file entry\n");
	194	err = -EIO;
	195	goto out;
	196	}
	197	if (filldir(dirent, strbuf, len, filp->f_pos,
	198	be32_to_cpu(entry.file.id), DT_REG))
	199	break;
	200	} else {
	201	printk(KERN_ERR "hfs: bad catalog entry type\n");
	202	err = -EIO;
	203	goto out;
	204	}
	205	next:
	206	filp->f_pos++;
	207	if (filp->f_pos >= inode->i_size)
	208	goto out;
	209	err = hfs_brec_goto(&fd, 1);
	210	if (err)
	211	goto out;
	212	}
	213	rd = filp->private_data;
	214	if (!rd) {
	215	rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
	216	if (!rd) {
	217	err = -ENOMEM;
	218	goto out;
	219	}
	220	filp->private_data = rd;
	221	rd->file = filp;
	222	list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
	223	}
	224	memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
	225	out:
	226	hfs_find_exit(&fd);
	227	return err;
	228	}
	229
	230	static int hfsplus_dir_release(struct inode inode, struct file file)
	231	{
	232	struct hfsplus_readdir_data *rd = file->private_data;
	233	if (rd) {
	234	mutex_lock(&inode->i_mutex);
	235	list_del(&rd->list);
	236	mutex_unlock(&inode->i_mutex);
	237	kfree(rd);
	238	}
	239	return 0;
	240	}
	241
	242	static int hfsplus_link(struct dentry src_dentry, struct inode dst_dir,
	243	struct dentry *dst_dentry)
	244	{
	245	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb);
	246	struct inode *inode = src_dentry->d_inode;
	247	struct inode *src_dir = src_dentry->d_parent->d_inode;
	248	struct qstr str;
	249	char name[32];
	250	u32 cnid, id;
	251	int res;
	252
	253	if (HFSPLUS_IS_RSRC(inode))
	254	return -EPERM;
	255	if (!S_ISREG(inode->i_mode))
	256	return -EPERM;
	257
	258	mutex_lock(&sbi->vh_mutex);
	259	if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
	260	for (;;) {
	261	get_random_bytes(&id, sizeof(cnid));
	262	id &= 0x3fffffff;
	263	str.name = name;
	264	str.len = sprintf(name, "iNode%d", id);
	265	res = hfsplus_rename_cat(inode->i_ino,
	266	src_dir, &src_dentry->d_name,
	267	sbi->hidden_dir, &str);
	268	if (!res)
	269	break;
	270	if (res != -EEXIST)
	271	goto out;
	272	}
	273	HFSPLUS_I(inode)->linkid = id;
	274	cnid = sbi->next_cnid++;
	275	src_dentry->d_fsdata = (void *)(unsigned long)cnid;
	276	res = hfsplus_create_cat(cnid, src_dir, &src_dentry->d_name, inode);
	277	if (res)
	278	/* panic? */
	279	goto out;
	280	sbi->file_count++;
	281	}
	282	cnid = sbi->next_cnid++;
	283	res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
	284	if (res)
	285	goto out;
	286
	287	inc_nlink(inode);
	288	hfsplus_instantiate(dst_dentry, inode, cnid);
	289	ihold(inode);
	290	inode->i_ctime = CURRENT_TIME_SEC;
	291	mark_inode_dirty(inode);
	292	sbi->file_count++;
	293	dst_dir->i_sb->s_dirt = 1;
	294	out:
	295	mutex_unlock(&sbi->vh_mutex);
	296	return res;
	297	}
	298
	299	static int hfsplus_unlink(struct inode dir, struct dentry dentry)
	300	{
	301	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
	302	struct inode *inode = dentry->d_inode;
	303	struct qstr str;
	304	char name[32];
	305	u32 cnid;
	306	int res;
	307
	308	if (HFSPLUS_IS_RSRC(inode))
	309	return -EPERM;
	310
	311	mutex_lock(&sbi->vh_mutex);
	312	cnid = (u32)(unsigned long)dentry->d_fsdata;
	313	if (inode->i_ino == cnid &&
	314	atomic_read(&HFSPLUS_I(inode)->opencnt)) {
	315	str.name = name;
	316	str.len = sprintf(name, "temp%lu", inode->i_ino);
	317	res = hfsplus_rename_cat(inode->i_ino,
	318	dir, &dentry->d_name,
	319	sbi->hidden_dir, &str);
	320	if (!res) {
	321	inode->i_flags \|= S_DEAD;
	322	drop_nlink(inode);
	323	}
	324	goto out;
	325	}
	326	res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
	327	if (res)
	328	goto out;
	329
	330	if (inode->i_nlink > 0)
	331	drop_nlink(inode);
	332	if (inode->i_ino == cnid)
	333	clear_nlink(inode);
	334	if (!inode->i_nlink) {
	335	if (inode->i_ino != cnid) {
	336	sbi->file_count--;
	337	if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) {
	338	res = hfsplus_delete_cat(inode->i_ino,
	339	sbi->hidden_dir,
	340	NULL);
	341	if (!res)
	342	hfsplus_delete_inode(inode);
	343	} else
	344	inode->i_flags \|= S_DEAD;
	345	} else
	346	hfsplus_delete_inode(inode);
	347	} else
	348	sbi->file_count--;
	349	inode->i_ctime = CURRENT_TIME_SEC;
	350	mark_inode_dirty(inode);
	351	out:
	352	mutex_unlock(&sbi->vh_mutex);
	353	return res;
	354	}
	355
	356	static int hfsplus_rmdir(struct inode dir, struct dentry dentry)
	357	{
	358	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
	359	struct inode *inode = dentry->d_inode;
	360	int res;
	361
	362	if (inode->i_size != 2)
	363	return -ENOTEMPTY;
	364
	365	mutex_lock(&sbi->vh_mutex);
	366	res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
	367	if (res)
	368	goto out;
	369	clear_nlink(inode);
	370	inode->i_ctime = CURRENT_TIME_SEC;
	371	hfsplus_delete_inode(inode);
	372	mark_inode_dirty(inode);
	373	out:
	374	mutex_unlock(&sbi->vh_mutex);
	375	return res;
	376	}
	377
	378	static int hfsplus_symlink(struct inode dir, struct dentry dentry,
	379	const char *symname)
	380	{
	381	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
	382	struct inode *inode;
	383	int res = -ENOSPC;
	384
	385	mutex_lock(&sbi->vh_mutex);
	386	inode = hfsplus_new_inode(dir->i_sb, S_IFLNK \| S_IRWXUGO);
	387	if (!inode)
	388	goto out;
	389
	390	res = page_symlink(inode, symname, strlen(symname) + 1);
	391	if (res)
	392	goto out_err;
	393
	394	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
	395	if (res)
	396	goto out_err;
	397
	398	hfsplus_instantiate(dentry, inode, inode->i_ino);
	399	mark_inode_dirty(inode);
	400	goto out;
	401
	402	out_err:
	403	inode->i_nlink = 0;
	404	hfsplus_delete_inode(inode);
	405	iput(inode);
	406	out:
	407	mutex_unlock(&sbi->vh_mutex);
	408	return res;
	409	}
	410
	411	static int hfsplus_mknod(struct inode dir, struct dentry dentry,
	412	int mode, dev_t rdev)
	413	{
	414	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
	415	struct inode *inode;
	416	int res = -ENOSPC;
	417
	418	mutex_lock(&sbi->vh_mutex);
	419	inode = hfsplus_new_inode(dir->i_sb, mode);
	420	if (!inode)
	421	goto out;
	422
	423	if (S_ISBLK(mode) \|\| S_ISCHR(mode) \|\| S_ISFIFO(mode) \|\| S_ISSOCK(mode))
	424	init_special_inode(inode, mode, rdev);
	425
	426	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
	427	if (res) {
	428	inode->i_nlink = 0;
	429	hfsplus_delete_inode(inode);
	430	iput(inode);
	431	goto out;
	432	}
	433
	434	hfsplus_instantiate(dentry, inode, inode->i_ino);
	435	mark_inode_dirty(inode);
	436	out:
	437	mutex_unlock(&sbi->vh_mutex);
	438	return res;
	439	}
	440
	441	static int hfsplus_create(struct inode dir, struct dentry dentry, int mode,
	442	struct nameidata *nd)
	443	{
	444	return hfsplus_mknod(dir, dentry, mode, 0);
	445	}
	446
	447	static int hfsplus_mkdir(struct inode dir, struct dentry dentry, int mode)
	448	{
	449	return hfsplus_mknod(dir, dentry, mode \| S_IFDIR, 0);
	450	}
	451
	452	static int hfsplus_rename(struct inode old_dir, struct dentry old_dentry,
	453	struct inode new_dir, struct dentry new_dentry)
	454	{
	455	int res;
	456
	457	/* Unlink destination if it already exists */
	458	if (new_dentry->d_inode) {
	459	if (S_ISDIR(new_dentry->d_inode->i_mode))
	460	res = hfsplus_rmdir(new_dir, new_dentry);
	461	else
	462	res = hfsplus_unlink(new_dir, new_dentry);
	463	if (res)
	464	return res;
	465	}
	466
	467	res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
	468	old_dir, &old_dentry->d_name,
	469	new_dir, &new_dentry->d_name);
	470	if (!res)
	471	new_dentry->d_fsdata = old_dentry->d_fsdata;
	472	return res;
	473	}
	474
	475	const struct inode_operations hfsplus_dir_inode_operations = {
	476	.lookup = hfsplus_lookup,
	477	.create = hfsplus_create,
	478	.link = hfsplus_link,
	479	.unlink = hfsplus_unlink,
	480	.mkdir = hfsplus_mkdir,
	481	.rmdir = hfsplus_rmdir,
	482	.symlink = hfsplus_symlink,
	483	.mknod = hfsplus_mknod,
	484	.rename = hfsplus_rename,
	485	};
	486
	487	const struct file_operations hfsplus_dir_operations = {
	488	.read = generic_read_dir,
	489	.readdir = hfsplus_readdir,
	490	.unlocked_ioctl = hfsplus_ioctl,
	491	.llseek = generic_file_llseek,
	492	.release = hfsplus_dir_release,
	493	};