[mirror_ubuntu-artful-kernel.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 = {
	.fsync		= hfsplus_file_fsync,
	.read		= generic_read_dir,
	.readdir	= hfsplus_readdir,
	.unlocked_ioctl = hfsplus_ioctl,
	.llseek		= generic_file_llseek,
	.release	= hfsplus_dir_release,
};
Commit	Line	Data
1da177e4 LT	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>
1da177e4 LT	13	#include <linux/slab.h>
1da177e4 LT	14	#include <linux/random.h>
1da177e4 LT	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;
d45bce8f DG	39
d45bce8f DG	40	dentry->d_op = &hfsplus_dentry_operations;
1da177e4	41	dentry->d_fsdata = NULL;
dd73a01a	42	hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
1da177e4 LT	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);
2753cc28 AS	69	if (entry.file.user_info.fdType ==
	70	cpu_to_be32(HFSP_HARDLINK_TYPE) &&
	71	entry.file.user_info.fdCreator ==
	72	cpu_to_be32(HFSP_HFSPLUS_CREATOR) &&
	73	(entry.file.create_date ==
	74	HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)->
	75	create_date \|\|
	76	entry.file.create_date ==
	77	HFSPLUS_I(sb->s_root->d_inode)->
	78	create_date) &&
	79	HFSPLUS_SB(sb)->hidden_dir) {
1da177e4 LT	80	struct qstr str;
	81	char name[32];
	82
	83	if (dentry->d_fsdata) {
af8c85bb RZ	84	/*
	85	* We found a link pointing to another link,
	86	* so ignore it and treat it as regular file.
	87	*/
	88	cnid = (unsigned long)dentry->d_fsdata;
	89	linkid = 0;
	90	} else {
	91	dentry->d_fsdata = (void *)(unsigned long)cnid;
2753cc28 AS	92	linkid =
2753cc28 AS	93	be32_to_cpu(entry.file.permissions.dev);
af8c85bb RZ	94	str.len = sprintf(name, "iNode%d", linkid);
af8c85bb RZ	95	str.name = name;
dd73a01a	96	hfsplus_cat_build_key(sb, fd.search_key,
2753cc28 AS	97	HFSPLUS_SB(sb)->hidden_dir->i_ino,
2753cc28 AS	98	&str);
af8c85bb	99	goto again;
1da177e4	100	}
1da177e4 LT	101	} else if (!dentry->d_fsdata)
	102	dentry->d_fsdata = (void *)(unsigned long)cnid;
	103	} else {
634725a9	104	printk(KERN_ERR "hfs: invalid catalog entry type in lookup\n");
1da177e4 LT	105	err = -EIO;
	106	goto fail;
	107	}
	108	hfs_find_exit(&fd);
63525391 DH	109	inode = hfsplus_iget(dir->i_sb, cnid);
	110	if (IS_ERR(inode))
	111	return ERR_CAST(inode);
1da177e4	112	if (S_ISREG(inode->i_mode))
f6089ff8	113	HFSPLUS_I(inode)->linkid = linkid;
1da177e4 LT	114	out:
	115	d_add(dentry, inode);
	116	return NULL;
	117	fail:
	118	hfs_find_exit(&fd);
	119	return ERR_PTR(err);
	120	}
	121
	122	static int hfsplus_readdir(struct file filp, void dirent, filldir_t filldir)
	123	{
f44ea031	124	struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4 LT	125	struct super_block *sb = inode->i_sb;
	126	int len, err;
	127	char strbuf[HFSPLUS_MAX_STRLEN + 1];
	128	hfsplus_cat_entry entry;
	129	struct hfs_find_data fd;
	130	struct hfsplus_readdir_data *rd;
	131	u16 type;
	132
	133	if (filp->f_pos >= inode->i_size)
	134	return 0;
	135
dd73a01a	136	hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
1da177e4 LT	137	hfsplus_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
	138	err = hfs_brec_find(&fd);
	139	if (err)
	140	goto out;
	141
	142	switch ((u32)filp->f_pos) {
	143	case 0:
	144	/* This is completely artificial... */
	145	if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR))
	146	goto out;
	147	filp->f_pos++;
	148	/* fall through */
	149	case 1:
2753cc28 AS	150	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
2753cc28 AS	151	fd.entrylength);
1da177e4	152	if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
634725a9	153	printk(KERN_ERR "hfs: bad catalog folder thread\n");
1da177e4 LT	154	err = -EIO;
	155	goto out;
	156	}
	157	if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
634725a9	158	printk(KERN_ERR "hfs: truncated catalog thread\n");
1da177e4 LT	159	err = -EIO;
	160	goto out;
	161	}
	162	if (filldir(dirent, "..", 2, 1,
	163	be32_to_cpu(entry.thread.parentID), DT_DIR))
	164	goto out;
	165	filp->f_pos++;
	166	/* fall through */
	167	default:
	168	if (filp->f_pos >= inode->i_size)
	169	goto out;
	170	err = hfs_brec_goto(&fd, filp->f_pos - 1);
	171	if (err)
	172	goto out;
	173	}
	174
	175	for (;;) {
	176	if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
634725a9	177	printk(KERN_ERR "hfs: walked past end of dir\n");
1da177e4 LT	178	err = -EIO;
	179	goto out;
	180	}
2753cc28 AS	181	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
2753cc28 AS	182	fd.entrylength);
1da177e4 LT	183	type = be16_to_cpu(entry.type);
	184	len = HFSPLUS_MAX_STRLEN;
	185	err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len);
	186	if (err)
	187	goto out;
	188	if (type == HFSPLUS_FOLDER) {
2753cc28 AS	189	if (fd.entrylength <
2753cc28 AS	190	sizeof(struct hfsplus_cat_folder)) {
634725a9	191	printk(KERN_ERR "hfs: small dir entry\n");
1da177e4 LT	192	err = -EIO;
	193	goto out;
	194	}
dd73a01a CH	195	if (HFSPLUS_SB(sb)->hidden_dir &&
	196	HFSPLUS_SB(sb)->hidden_dir->i_ino ==
	197	be32_to_cpu(entry.folder.id))
1da177e4 LT	198	goto next;
	199	if (filldir(dirent, strbuf, len, filp->f_pos,
	200	be32_to_cpu(entry.folder.id), DT_DIR))
	201	break;
	202	} else if (type == HFSPLUS_FILE) {
	203	if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
634725a9	204	printk(KERN_ERR "hfs: small file entry\n");
1da177e4 LT	205	err = -EIO;
	206	goto out;
	207	}
	208	if (filldir(dirent, strbuf, len, filp->f_pos,
	209	be32_to_cpu(entry.file.id), DT_REG))
	210	break;
	211	} else {
634725a9	212	printk(KERN_ERR "hfs: bad catalog entry type\n");
1da177e4 LT	213	err = -EIO;
	214	goto out;
	215	}
	216	next:
	217	filp->f_pos++;
	218	if (filp->f_pos >= inode->i_size)
	219	goto out;
	220	err = hfs_brec_goto(&fd, 1);
	221	if (err)
	222	goto out;
	223	}
	224	rd = filp->private_data;
	225	if (!rd) {
	226	rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
	227	if (!rd) {
	228	err = -ENOMEM;
	229	goto out;
	230	}
	231	filp->private_data = rd;
	232	rd->file = filp;
6af502de	233	list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
1da177e4 LT	234	}
	235	memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
	236	out:
	237	hfs_find_exit(&fd);
	238	return err;
	239	}
	240
	241	static int hfsplus_dir_release(struct inode inode, struct file file)
	242	{
	243	struct hfsplus_readdir_data *rd = file->private_data;
	244	if (rd) {
89755dca	245	mutex_lock(&inode->i_mutex);
1da177e4	246	list_del(&rd->list);
89755dca	247	mutex_unlock(&inode->i_mutex);
1da177e4 LT	248	kfree(rd);
	249	}
	250	return 0;
	251	}
	252
1da177e4 LT	253	static int hfsplus_link(struct dentry src_dentry, struct inode dst_dir,
	254	struct dentry *dst_dentry)
	255	{
dd73a01a	256	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb);
1da177e4 LT	257	struct inode *inode = src_dentry->d_inode;
	258	struct inode *src_dir = src_dentry->d_parent->d_inode;
	259	struct qstr str;
	260	char name[32];
	261	u32 cnid, id;
	262	int res;
	263
	264	if (HFSPLUS_IS_RSRC(inode))
	265	return -EPERM;
f6089ff8 CH	266	if (!S_ISREG(inode->i_mode))
f6089ff8 CH	267	return -EPERM;
1da177e4	268
7ac9fb9c	269	mutex_lock(&sbi->vh_mutex);
1da177e4 LT	270	if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
	271	for (;;) {
	272	get_random_bytes(&id, sizeof(cnid));
	273	id &= 0x3fffffff;
	274	str.name = name;
	275	str.len = sprintf(name, "iNode%d", id);
	276	res = hfsplus_rename_cat(inode->i_ino,
	277	src_dir, &src_dentry->d_name,
dd73a01a	278	sbi->hidden_dir, &str);
1da177e4 LT	279	if (!res)
	280	break;
	281	if (res != -EEXIST)
7ac9fb9c	282	goto out;
1da177e4	283	}
f6089ff8	284	HFSPLUS_I(inode)->linkid = id;
dd73a01a	285	cnid = sbi->next_cnid++;
1da177e4	286	src_dentry->d_fsdata = (void *)(unsigned long)cnid;
2753cc28 AS	287	res = hfsplus_create_cat(cnid, src_dir,
2753cc28 AS	288	&src_dentry->d_name, inode);
1da177e4 LT	289	if (res)
1da177e4 LT	290	/* panic? */
7ac9fb9c	291	goto out;
dd73a01a	292	sbi->file_count++;
1da177e4	293	}
dd73a01a	294	cnid = sbi->next_cnid++;
1da177e4 LT	295	res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
1da177e4 LT	296	if (res)
7ac9fb9c	297	goto out;
1da177e4	298
d8c76e6f	299	inc_nlink(inode);
1da177e4	300	hfsplus_instantiate(dst_dentry, inode, cnid);
7de9c6ee	301	ihold(inode);
1da177e4 LT	302	inode->i_ctime = CURRENT_TIME_SEC;
1da177e4 LT	303	mark_inode_dirty(inode);
dd73a01a CH	304	sbi->file_count++;
dd73a01a CH	305	dst_dir->i_sb->s_dirt = 1;
7ac9fb9c CH	306	out:
	307	mutex_unlock(&sbi->vh_mutex);
	308	return res;
1da177e4 LT	309	}
	310
	311	static int hfsplus_unlink(struct inode dir, struct dentry dentry)
	312	{
dd73a01a	313	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
1da177e4 LT	314	struct inode *inode = dentry->d_inode;
	315	struct qstr str;
	316	char name[32];
	317	u32 cnid;
	318	int res;
	319
	320	if (HFSPLUS_IS_RSRC(inode))
	321	return -EPERM;
	322
7ac9fb9c	323	mutex_lock(&sbi->vh_mutex);
1da177e4 LT	324	cnid = (u32)(unsigned long)dentry->d_fsdata;
1da177e4 LT	325	if (inode->i_ino == cnid &&
6af502de	326	atomic_read(&HFSPLUS_I(inode)->opencnt)) {
1da177e4 LT	327	str.name = name;
	328	str.len = sprintf(name, "temp%lu", inode->i_ino);
	329	res = hfsplus_rename_cat(inode->i_ino,
	330	dir, &dentry->d_name,
dd73a01a	331	sbi->hidden_dir, &str);
85b8fe8c	332	if (!res) {
1da177e4	333	inode->i_flags \|= S_DEAD;
85b8fe8c CH	334	drop_nlink(inode);
85b8fe8c CH	335	}
7ac9fb9c	336	goto out;
1da177e4 LT	337	}
	338	res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
	339	if (res)
7ac9fb9c	340	goto out;
1da177e4	341
af8c85bb	342	if (inode->i_nlink > 0)
9a53c3a7	343	drop_nlink(inode);
76b0c26a RZ	344	if (inode->i_ino == cnid)
	345	clear_nlink(inode);
	346	if (!inode->i_nlink) {
	347	if (inode->i_ino != cnid) {
dd73a01a	348	sbi->file_count--;
6af502de	349	if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) {
76b0c26a	350	res = hfsplus_delete_cat(inode->i_ino,
dd73a01a	351	sbi->hidden_dir,
76b0c26a RZ	352	NULL);
	353	if (!res)
	354	hfsplus_delete_inode(inode);
	355	} else
	356	inode->i_flags \|= S_DEAD;
1da177e4	357	} else
76b0c26a	358	hfsplus_delete_inode(inode);
af8c85bb	359	} else
dd73a01a	360	sbi->file_count--;
1da177e4 LT	361	inode->i_ctime = CURRENT_TIME_SEC;
1da177e4 LT	362	mark_inode_dirty(inode);
7ac9fb9c CH	363	out:
7ac9fb9c CH	364	mutex_unlock(&sbi->vh_mutex);
1da177e4 LT	365	return res;
	366	}
	367
1da177e4 LT	368	static int hfsplus_rmdir(struct inode dir, struct dentry dentry)
1da177e4 LT	369	{
7ac9fb9c CH	370	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
7ac9fb9c CH	371	struct inode *inode = dentry->d_inode;
1da177e4 LT	372	int res;
1da177e4 LT	373
1da177e4 LT	374	if (inode->i_size != 2)
1da177e4 LT	375	return -ENOTEMPTY;
7ac9fb9c CH	376
7ac9fb9c CH	377	mutex_lock(&sbi->vh_mutex);
1da177e4 LT	378	res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
1da177e4 LT	379	if (res)
7ac9fb9c	380	goto out;
ce71ec36	381	clear_nlink(inode);
1da177e4 LT	382	inode->i_ctime = CURRENT_TIME_SEC;
	383	hfsplus_delete_inode(inode);
	384	mark_inode_dirty(inode);
7ac9fb9c CH	385	out:
	386	mutex_unlock(&sbi->vh_mutex);
	387	return res;
1da177e4 LT	388	}
	389
	390	static int hfsplus_symlink(struct inode dir, struct dentry dentry,
	391	const char *symname)
	392	{
7ac9fb9c	393	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
1da177e4	394	struct inode *inode;
7ac9fb9c	395	int res = -ENOSPC;
1da177e4	396
7ac9fb9c	397	mutex_lock(&sbi->vh_mutex);
f17c89bf	398	inode = hfsplus_new_inode(dir->i_sb, S_IFLNK \| S_IRWXUGO);
1da177e4	399	if (!inode)
7ac9fb9c	400	goto out;
1da177e4 LT	401
1da177e4 LT	402	res = page_symlink(inode, symname, strlen(symname) + 1);
f17c89bf CH	403	if (res)
f17c89bf CH	404	goto out_err;
1da177e4	405
1da177e4	406	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
f17c89bf CH	407	if (res)
f17c89bf CH	408	goto out_err;
1da177e4	409
f17c89bf CH	410	hfsplus_instantiate(dentry, inode, inode->i_ino);
f17c89bf CH	411	mark_inode_dirty(inode);
7ac9fb9c	412	goto out;
1da177e4	413
f17c89bf CH	414	out_err:
	415	inode->i_nlink = 0;
	416	hfsplus_delete_inode(inode);
	417	iput(inode);
7ac9fb9c CH	418	out:
7ac9fb9c CH	419	mutex_unlock(&sbi->vh_mutex);
1da177e4 LT	420	return res;
	421	}
	422
	423	static int hfsplus_mknod(struct inode dir, struct dentry dentry,
	424	int mode, dev_t rdev)
	425	{
7ac9fb9c	426	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
1da177e4	427	struct inode *inode;
7ac9fb9c	428	int res = -ENOSPC;
1da177e4	429
7ac9fb9c	430	mutex_lock(&sbi->vh_mutex);
30d3abbe	431	inode = hfsplus_new_inode(dir->i_sb, mode);
1da177e4	432	if (!inode)
7ac9fb9c	433	goto out;
1da177e4	434
90e61690 CH	435	if (S_ISBLK(mode) \|\| S_ISCHR(mode) \|\| S_ISFIFO(mode) \|\| S_ISSOCK(mode))
	436	init_special_inode(inode, mode, rdev);
	437
1da177e4 LT	438	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
	439	if (res) {
	440	inode->i_nlink = 0;
	441	hfsplus_delete_inode(inode);
	442	iput(inode);
7ac9fb9c	443	goto out;
1da177e4	444	}
30d3abbe	445
1da177e4 LT	446	hfsplus_instantiate(dentry, inode, inode->i_ino);
1da177e4 LT	447	mark_inode_dirty(inode);
7ac9fb9c CH	448	out:
	449	mutex_unlock(&sbi->vh_mutex);
	450	return res;
1da177e4 LT	451	}
1da177e4 LT	452
30d3abbe CH	453	static int hfsplus_create(struct inode dir, struct dentry dentry, int mode,
	454	struct nameidata *nd)
	455	{
	456	return hfsplus_mknod(dir, dentry, mode, 0);
	457	}
	458
	459	static int hfsplus_mkdir(struct inode dir, struct dentry dentry, int mode)
	460	{
	461	return hfsplus_mknod(dir, dentry, mode \| S_IFDIR, 0);
	462	}
	463
1da177e4 LT	464	static int hfsplus_rename(struct inode old_dir, struct dentry old_dentry,
	465	struct inode new_dir, struct dentry new_dentry)
	466	{
	467	int res;
	468
	469	/* Unlink destination if it already exists */
	470	if (new_dentry->d_inode) {
40de9a7c CH	471	if (S_ISDIR(new_dentry->d_inode->i_mode))
	472	res = hfsplus_rmdir(new_dir, new_dentry);
	473	else
	474	res = hfsplus_unlink(new_dir, new_dentry);
1da177e4 LT	475	if (res)
	476	return res;
	477	}
	478
	479	res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
	480	old_dir, &old_dentry->d_name,
	481	new_dir, &new_dentry->d_name);
	482	if (!res)
	483	new_dentry->d_fsdata = old_dentry->d_fsdata;
	484	return res;
	485	}
	486
92e1d5be	487	const struct inode_operations hfsplus_dir_inode_operations = {
1da177e4 LT	488	.lookup = hfsplus_lookup,
	489	.create = hfsplus_create,
	490	.link = hfsplus_link,
	491	.unlink = hfsplus_unlink,
	492	.mkdir = hfsplus_mkdir,
	493	.rmdir = hfsplus_rmdir,
	494	.symlink = hfsplus_symlink,
	495	.mknod = hfsplus_mknod,
	496	.rename = hfsplus_rename,
	497	};
	498
4b6f5d20	499	const struct file_operations hfsplus_dir_operations = {
eb29d66d	500	.fsync = hfsplus_file_fsync,
1da177e4 LT	501	.read = generic_read_dir,
1da177e4 LT	502	.readdir = hfsplus_readdir,
7cc4bcc6	503	.unlocked_ioctl = hfsplus_ioctl,
1da177e4 LT	504	.llseek = generic_file_llseek,
	505	.release = hfsplus_dir_release,
	506	};