[linux-2.6-block.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 <linux/nls.h>

#include "hfsplus_fs.h"
#include "hfsplus_raw.h"
#include "xattr.h"
#include "acl.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,
				     unsigned int flags)
{
	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_fsdata = NULL;
	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
	if (err)
		return ERR_PTR(err);
	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 {
		pr_err("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 *file, struct dir_context *ctx)
{
	struct inode *inode = file_inode(file);
	struct super_block *sb = inode->i_sb;
	int len, err;
	char *strbuf;
	hfsplus_cat_entry entry;
	struct hfs_find_data fd;
	struct hfsplus_readdir_data *rd;
	u16 type;

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

	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
	if (err)
		return err;
	strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN + 1, GFP_KERNEL);
	if (!strbuf) {
		err = -ENOMEM;
		goto out;
	}
	hfsplus_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
	if (err)
		goto out;

	if (ctx->pos == 0) {
		/* This is completely artificial... */
		if (!dir_emit_dot(file, ctx))
			goto out;
		ctx->pos = 1;
	}
	if (ctx->pos == 1) {
		if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
			err = -EIO;
			goto out;
		}

		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
			fd.entrylength);
		if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
			pr_err("bad catalog folder thread\n");
			err = -EIO;
			goto out;
		}
		if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
			pr_err("truncated catalog thread\n");
			err = -EIO;
			goto out;
		}
		if (!dir_emit(ctx, "..", 2,
			    be32_to_cpu(entry.thread.parentID), DT_DIR))
			goto out;
		ctx->pos = 2;
	}
	if (ctx->pos >= inode->i_size)
		goto out;
	err = hfs_brec_goto(&fd, ctx->pos - 1);
	if (err)
		goto out;
	for (;;) {
		if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
			pr_err("walked past end of dir\n");
			err = -EIO;
			goto out;
		}

		if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
			err = -EIO;
			goto out;
		}

		hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
			fd.entrylength);
		type = be16_to_cpu(entry.type);
		len = NLS_MAX_CHARSET_SIZE * 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)) {
				pr_err("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 (!dir_emit(ctx, strbuf, len,
				    be32_to_cpu(entry.folder.id), DT_DIR))
				break;
		} else if (type == HFSPLUS_FILE) {
			u16 mode;
			unsigned type = DT_UNKNOWN;

			if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
				pr_err("small file entry\n");
				err = -EIO;
				goto out;
			}

			mode = be16_to_cpu(entry.file.permissions.mode);
			if (S_ISREG(mode))
				type = DT_REG;
			else if (S_ISLNK(mode))
				type = DT_LNK;
			else if (S_ISFIFO(mode))
				type = DT_FIFO;
			else if (S_ISCHR(mode))
				type = DT_CHR;
			else if (S_ISBLK(mode))
				type = DT_BLK;
			else if (S_ISSOCK(mode))
				type = DT_SOCK;

			if (!dir_emit(ctx, strbuf, len,
				      be32_to_cpu(entry.file.id), type))
				break;
		} else {
			pr_err("bad catalog entry type\n");
			err = -EIO;
			goto out;
		}
next:
		ctx->pos++;
		if (ctx->pos >= inode->i_size)
			goto out;
		err = hfs_brec_goto(&fd, 1);
		if (err)
			goto out;
	}
	rd = file->private_data;
	if (!rd) {
		rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
		if (!rd) {
			err = -ENOMEM;
			goto out;
		}
		file->private_data = rd;
		rd->file = file;
		list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
	}
	memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
out:
	kfree(strbuf);
	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++;
	hfsplus_mark_mdb_dirty(dst_dir->i_sb);
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;

	res = hfsplus_init_inode_security(inode, dir, &dentry->d_name);
	if (res == -EOPNOTSUPP)
		res = 0; /* Operation is not supported. */
	else if (res) {
		/* Try to delete anyway without error analysis. */
		hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
		goto out_err;
	}

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

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

static int hfsplus_mknod(struct inode *dir, struct dentry *dentry,
			 umode_t 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)
		goto failed_mknod;

	res = hfsplus_init_inode_security(inode, dir, &dentry->d_name);
	if (res == -EOPNOTSUPP)
		res = 0; /* Operation is not supported. */
	else if (res) {
		/* Try to delete anyway without error analysis. */
		hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
		goto failed_mknod;
	}

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

failed_mknod:
	clear_nlink(inode);
	hfsplus_delete_inode(inode);
	iput(inode);
out:
	mutex_unlock(&sbi->vh_mutex);
	return res;
}

static int hfsplus_create(struct inode *dir, struct dentry *dentry, umode_t mode,
			  bool excl)
{
	return hfsplus_mknod(dir, dentry, mode, 0);
}

static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, umode_t 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,
	.setxattr		= generic_setxattr,
	.getxattr		= generic_getxattr,
	.listxattr		= hfsplus_listxattr,
	.removexattr		= generic_removexattr,
#ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
	.get_acl		= hfsplus_get_posix_acl,
	.set_acl		= hfsplus_set_posix_acl,
#endif
};

const struct file_operations hfsplus_dir_operations = {
	.fsync		= hfsplus_file_fsync,
	.read		= generic_read_dir,
	.iterate	= 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>
017f8da4	15	#include <linux/nls.h>
1da177e4 LT	16
	17	#include "hfsplus_fs.h"
	18	#include "hfsplus_raw.h"
324ef39a	19	#include "xattr.h"
b4c1107c	20	#include "acl.h"
1da177e4 LT	21
	22	static inline void hfsplus_instantiate(struct dentry *dentry,
	23	struct inode *inode, u32 cnid)
	24	{
	25	dentry->d_fsdata = (void *)(unsigned long)cnid;
	26	d_instantiate(dentry, inode);
	27	}
	28
	29	/* Find the entry inside dir named dentry->d_name */
	30	static struct dentry hfsplus_lookup(struct inode dir, struct dentry *dentry,
00cd8dd3	31	unsigned int flags)
1da177e4 LT	32	{
	33	struct inode *inode = NULL;
	34	struct hfs_find_data fd;
	35	struct super_block *sb;
	36	hfsplus_cat_entry entry;
	37	int err;
	38	u32 cnid, linkid = 0;
	39	u16 type;
	40
	41	sb = dir->i_sb;
d45bce8f	42
1da177e4	43	dentry->d_fsdata = NULL;
5bd9d99d AK	44	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
	45	if (err)
	46	return ERR_PTR(err);
1da177e4 LT	47	hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name);
	48	again:
	49	err = hfs_brec_read(&fd, &entry, sizeof(entry));
	50	if (err) {
	51	if (err == -ENOENT) {
	52	hfs_find_exit(&fd);
	53	/* No such entry */
	54	inode = NULL;
	55	goto out;
	56	}
	57	goto fail;
	58	}
	59	type = be16_to_cpu(entry.type);
	60	if (type == HFSPLUS_FOLDER) {
	61	if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
	62	err = -EIO;
	63	goto fail;
	64	}
	65	cnid = be32_to_cpu(entry.folder.id);
	66	dentry->d_fsdata = (void *)(unsigned long)cnid;
	67	} else if (type == HFSPLUS_FILE) {
	68	if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
	69	err = -EIO;
	70	goto fail;
	71	}
	72	cnid = be32_to_cpu(entry.file.id);
2753cc28 AS	73	if (entry.file.user_info.fdType ==
	74	cpu_to_be32(HFSP_HARDLINK_TYPE) &&
	75	entry.file.user_info.fdCreator ==
	76	cpu_to_be32(HFSP_HFSPLUS_CREATOR) &&
	77	(entry.file.create_date ==
	78	HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)->
	79	create_date \|\|
	80	entry.file.create_date ==
	81	HFSPLUS_I(sb->s_root->d_inode)->
	82	create_date) &&
	83	HFSPLUS_SB(sb)->hidden_dir) {
1da177e4 LT	84	struct qstr str;
	85	char name[32];
	86
	87	if (dentry->d_fsdata) {
af8c85bb RZ	88	/*
	89	* We found a link pointing to another link,
	90	* so ignore it and treat it as regular file.
	91	*/
	92	cnid = (unsigned long)dentry->d_fsdata;
	93	linkid = 0;
	94	} else {
	95	dentry->d_fsdata = (void *)(unsigned long)cnid;
2753cc28 AS	96	linkid =
2753cc28 AS	97	be32_to_cpu(entry.file.permissions.dev);
af8c85bb RZ	98	str.len = sprintf(name, "iNode%d", linkid);
af8c85bb RZ	99	str.name = name;
dd73a01a	100	hfsplus_cat_build_key(sb, fd.search_key,
2753cc28 AS	101	HFSPLUS_SB(sb)->hidden_dir->i_ino,
2753cc28 AS	102	&str);
af8c85bb	103	goto again;
1da177e4	104	}
1da177e4 LT	105	} else if (!dentry->d_fsdata)
	106	dentry->d_fsdata = (void *)(unsigned long)cnid;
	107	} else {
d6142673	108	pr_err("invalid catalog entry type in lookup\n");
1da177e4 LT	109	err = -EIO;
	110	goto fail;
	111	}
	112	hfs_find_exit(&fd);
63525391 DH	113	inode = hfsplus_iget(dir->i_sb, cnid);
	114	if (IS_ERR(inode))
	115	return ERR_CAST(inode);
1da177e4	116	if (S_ISREG(inode->i_mode))
f6089ff8	117	HFSPLUS_I(inode)->linkid = linkid;
1da177e4 LT	118	out:
	119	d_add(dentry, inode);
	120	return NULL;
	121	fail:
	122	hfs_find_exit(&fd);
	123	return ERR_PTR(err);
	124	}
	125
e72514e7	126	static int hfsplus_readdir(struct file file, struct dir_context ctx)
1da177e4	127	{
e72514e7	128	struct inode *inode = file_inode(file);
1da177e4 LT	129	struct super_block *sb = inode->i_sb;
1da177e4 LT	130	int len, err;
017f8da4	131	char *strbuf;
1da177e4 LT	132	hfsplus_cat_entry entry;
	133	struct hfs_find_data fd;
	134	struct hfsplus_readdir_data *rd;
	135	u16 type;
	136
e72514e7	137	if (file->f_pos >= inode->i_size)
1da177e4 LT	138	return 0;
1da177e4 LT	139
5bd9d99d AK	140	err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
	141	if (err)
	142	return err;
017f8da4 HTL	143	strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN + 1, GFP_KERNEL);
	144	if (!strbuf) {
	145	err = -ENOMEM;
	146	goto out;
	147	}
1da177e4	148	hfsplus_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
324ef39a	149	err = hfs_brec_find(&fd, hfs_find_rec_by_key);
1da177e4 LT	150	if (err)
	151	goto out;
	152
e72514e7	153	if (ctx->pos == 0) {
1da177e4	154	/* This is completely artificial... */
e72514e7	155	if (!dir_emit_dot(file, ctx))
1da177e4	156	goto out;
e72514e7 AV	157	ctx->pos = 1;
	158	}
	159	if (ctx->pos == 1) {
6f24f892 GKH	160	if (fd.entrylength > sizeof(entry) \|\| fd.entrylength < 0) {
	161	err = -EIO;
	162	goto out;
	163	}
	164
2753cc28 AS	165	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
2753cc28 AS	166	fd.entrylength);
1da177e4	167	if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
d6142673	168	pr_err("bad catalog folder thread\n");
1da177e4 LT	169	err = -EIO;
	170	goto out;
	171	}
	172	if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
d6142673	173	pr_err("truncated catalog thread\n");
1da177e4 LT	174	err = -EIO;
	175	goto out;
	176	}
e72514e7	177	if (!dir_emit(ctx, "..", 2,
1da177e4 LT	178	be32_to_cpu(entry.thread.parentID), DT_DIR))
1da177e4 LT	179	goto out;
e72514e7	180	ctx->pos = 2;
1da177e4	181	}
e72514e7 AV	182	if (ctx->pos >= inode->i_size)
	183	goto out;
	184	err = hfs_brec_goto(&fd, ctx->pos - 1);
	185	if (err)
	186	goto out;
1da177e4 LT	187	for (;;) {
1da177e4 LT	188	if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
d6142673	189	pr_err("walked past end of dir\n");
1da177e4 LT	190	err = -EIO;
	191	goto out;
	192	}
6f24f892 GKH	193
	194	if (fd.entrylength > sizeof(entry) \|\| fd.entrylength < 0) {
	195	err = -EIO;
	196	goto out;
	197	}
	198
2753cc28 AS	199	hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
2753cc28 AS	200	fd.entrylength);
1da177e4	201	type = be16_to_cpu(entry.type);
017f8da4	202	len = NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN;
1da177e4 LT	203	err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len);
	204	if (err)
	205	goto out;
	206	if (type == HFSPLUS_FOLDER) {
2753cc28 AS	207	if (fd.entrylength <
2753cc28 AS	208	sizeof(struct hfsplus_cat_folder)) {
d6142673	209	pr_err("small dir entry\n");
1da177e4 LT	210	err = -EIO;
	211	goto out;
	212	}
dd73a01a CH	213	if (HFSPLUS_SB(sb)->hidden_dir &&
	214	HFSPLUS_SB(sb)->hidden_dir->i_ino ==
	215	be32_to_cpu(entry.folder.id))
1da177e4	216	goto next;
e72514e7	217	if (!dir_emit(ctx, strbuf, len,
1da177e4 LT	218	be32_to_cpu(entry.folder.id), DT_DIR))
	219	break;
	220	} else if (type == HFSPLUS_FILE) {
97a62eae SA	221	u16 mode;
	222	unsigned type = DT_UNKNOWN;
	223
1da177e4	224	if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
d6142673	225	pr_err("small file entry\n");
1da177e4 LT	226	err = -EIO;
	227	goto out;
	228	}
97a62eae SA	229
	230	mode = be16_to_cpu(entry.file.permissions.mode);
	231	if (S_ISREG(mode))
	232	type = DT_REG;
	233	else if (S_ISLNK(mode))
	234	type = DT_LNK;
	235	else if (S_ISFIFO(mode))
	236	type = DT_FIFO;
	237	else if (S_ISCHR(mode))
	238	type = DT_CHR;
	239	else if (S_ISBLK(mode))
	240	type = DT_BLK;
	241	else if (S_ISSOCK(mode))
	242	type = DT_SOCK;
	243
e72514e7	244	if (!dir_emit(ctx, strbuf, len,
97a62eae	245	be32_to_cpu(entry.file.id), type))
1da177e4 LT	246	break;
1da177e4 LT	247	} else {
d6142673	248	pr_err("bad catalog entry type\n");
1da177e4 LT	249	err = -EIO;
	250	goto out;
	251	}
20b7643d	252	next:
e72514e7 AV	253	ctx->pos++;
e72514e7 AV	254	if (ctx->pos >= inode->i_size)
1da177e4 LT	255	goto out;
	256	err = hfs_brec_goto(&fd, 1);
	257	if (err)
	258	goto out;
	259	}
e72514e7	260	rd = file->private_data;
1da177e4 LT	261	if (!rd) {
	262	rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
	263	if (!rd) {
	264	err = -ENOMEM;
	265	goto out;
	266	}
e72514e7 AV	267	file->private_data = rd;
e72514e7 AV	268	rd->file = file;
6af502de	269	list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
1da177e4 LT	270	}
	271	memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
	272	out:
017f8da4	273	kfree(strbuf);
1da177e4 LT	274	hfs_find_exit(&fd);
	275	return err;
	276	}
	277
	278	static int hfsplus_dir_release(struct inode inode, struct file file)
	279	{
	280	struct hfsplus_readdir_data *rd = file->private_data;
	281	if (rd) {
89755dca	282	mutex_lock(&inode->i_mutex);
1da177e4	283	list_del(&rd->list);
89755dca	284	mutex_unlock(&inode->i_mutex);
1da177e4 LT	285	kfree(rd);
	286	}
	287	return 0;
	288	}
	289
1da177e4 LT	290	static int hfsplus_link(struct dentry src_dentry, struct inode dst_dir,
	291	struct dentry *dst_dentry)
	292	{
dd73a01a	293	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb);
1da177e4 LT	294	struct inode *inode = src_dentry->d_inode;
	295	struct inode *src_dir = src_dentry->d_parent->d_inode;
	296	struct qstr str;
	297	char name[32];
	298	u32 cnid, id;
	299	int res;
	300
	301	if (HFSPLUS_IS_RSRC(inode))
	302	return -EPERM;
f6089ff8 CH	303	if (!S_ISREG(inode->i_mode))
f6089ff8 CH	304	return -EPERM;
1da177e4	305
7ac9fb9c	306	mutex_lock(&sbi->vh_mutex);
1da177e4 LT	307	if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
	308	for (;;) {
	309	get_random_bytes(&id, sizeof(cnid));
	310	id &= 0x3fffffff;
	311	str.name = name;
	312	str.len = sprintf(name, "iNode%d", id);
	313	res = hfsplus_rename_cat(inode->i_ino,
	314	src_dir, &src_dentry->d_name,
dd73a01a	315	sbi->hidden_dir, &str);
1da177e4 LT	316	if (!res)
	317	break;
	318	if (res != -EEXIST)
7ac9fb9c	319	goto out;
1da177e4	320	}
f6089ff8	321	HFSPLUS_I(inode)->linkid = id;
dd73a01a	322	cnid = sbi->next_cnid++;
1da177e4	323	src_dentry->d_fsdata = (void *)(unsigned long)cnid;
2753cc28 AS	324	res = hfsplus_create_cat(cnid, src_dir,
2753cc28 AS	325	&src_dentry->d_name, inode);
1da177e4 LT	326	if (res)
1da177e4 LT	327	/* panic? */
7ac9fb9c	328	goto out;
dd73a01a	329	sbi->file_count++;
1da177e4	330	}
dd73a01a	331	cnid = sbi->next_cnid++;
1da177e4 LT	332	res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
1da177e4 LT	333	if (res)
7ac9fb9c	334	goto out;
1da177e4	335
d8c76e6f	336	inc_nlink(inode);
1da177e4	337	hfsplus_instantiate(dst_dentry, inode, cnid);
7de9c6ee	338	ihold(inode);
1da177e4 LT	339	inode->i_ctime = CURRENT_TIME_SEC;
1da177e4 LT	340	mark_inode_dirty(inode);
dd73a01a	341	sbi->file_count++;
9e6c5829	342	hfsplus_mark_mdb_dirty(dst_dir->i_sb);
7ac9fb9c CH	343	out:
	344	mutex_unlock(&sbi->vh_mutex);
	345	return res;
1da177e4 LT	346	}
	347
	348	static int hfsplus_unlink(struct inode dir, struct dentry dentry)
	349	{
dd73a01a	350	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
1da177e4 LT	351	struct inode *inode = dentry->d_inode;
	352	struct qstr str;
	353	char name[32];
	354	u32 cnid;
	355	int res;
	356
	357	if (HFSPLUS_IS_RSRC(inode))
	358	return -EPERM;
	359
7ac9fb9c	360	mutex_lock(&sbi->vh_mutex);
1da177e4 LT	361	cnid = (u32)(unsigned long)dentry->d_fsdata;
1da177e4 LT	362	if (inode->i_ino == cnid &&
6af502de	363	atomic_read(&HFSPLUS_I(inode)->opencnt)) {
1da177e4 LT	364	str.name = name;
	365	str.len = sprintf(name, "temp%lu", inode->i_ino);
	366	res = hfsplus_rename_cat(inode->i_ino,
	367	dir, &dentry->d_name,
dd73a01a	368	sbi->hidden_dir, &str);
85b8fe8c	369	if (!res) {
1da177e4	370	inode->i_flags \|= S_DEAD;
85b8fe8c CH	371	drop_nlink(inode);
85b8fe8c CH	372	}
7ac9fb9c	373	goto out;
1da177e4 LT	374	}
	375	res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
	376	if (res)
7ac9fb9c	377	goto out;
1da177e4	378
af8c85bb	379	if (inode->i_nlink > 0)
9a53c3a7	380	drop_nlink(inode);
76b0c26a RZ	381	if (inode->i_ino == cnid)
	382	clear_nlink(inode);
	383	if (!inode->i_nlink) {
	384	if (inode->i_ino != cnid) {
dd73a01a	385	sbi->file_count--;
6af502de	386	if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) {
76b0c26a	387	res = hfsplus_delete_cat(inode->i_ino,
dd73a01a	388	sbi->hidden_dir,
76b0c26a RZ	389	NULL);
	390	if (!res)
	391	hfsplus_delete_inode(inode);
	392	} else
	393	inode->i_flags \|= S_DEAD;
1da177e4	394	} else
76b0c26a	395	hfsplus_delete_inode(inode);
af8c85bb	396	} else
dd73a01a	397	sbi->file_count--;
1da177e4 LT	398	inode->i_ctime = CURRENT_TIME_SEC;
1da177e4 LT	399	mark_inode_dirty(inode);
7ac9fb9c CH	400	out:
7ac9fb9c CH	401	mutex_unlock(&sbi->vh_mutex);
1da177e4 LT	402	return res;
	403	}
	404
1da177e4 LT	405	static int hfsplus_rmdir(struct inode dir, struct dentry dentry)
1da177e4 LT	406	{
7ac9fb9c CH	407	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
7ac9fb9c CH	408	struct inode *inode = dentry->d_inode;
1da177e4 LT	409	int res;
1da177e4 LT	410
1da177e4 LT	411	if (inode->i_size != 2)
1da177e4 LT	412	return -ENOTEMPTY;
7ac9fb9c CH	413
7ac9fb9c CH	414	mutex_lock(&sbi->vh_mutex);
1da177e4 LT	415	res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
1da177e4 LT	416	if (res)
7ac9fb9c	417	goto out;
ce71ec36	418	clear_nlink(inode);
1da177e4 LT	419	inode->i_ctime = CURRENT_TIME_SEC;
	420	hfsplus_delete_inode(inode);
	421	mark_inode_dirty(inode);
7ac9fb9c CH	422	out:
	423	mutex_unlock(&sbi->vh_mutex);
	424	return res;
1da177e4 LT	425	}
	426
	427	static int hfsplus_symlink(struct inode dir, struct dentry dentry,
	428	const char *symname)
	429	{
7ac9fb9c	430	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
1da177e4	431	struct inode *inode;
7ac9fb9c	432	int res = -ENOSPC;
1da177e4	433
7ac9fb9c	434	mutex_lock(&sbi->vh_mutex);
f17c89bf	435	inode = hfsplus_new_inode(dir->i_sb, S_IFLNK \| S_IRWXUGO);
1da177e4	436	if (!inode)
7ac9fb9c	437	goto out;
1da177e4 LT	438
1da177e4 LT	439	res = page_symlink(inode, symname, strlen(symname) + 1);
f17c89bf CH	440	if (res)
f17c89bf CH	441	goto out_err;
1da177e4	442
1da177e4	443	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
f17c89bf CH	444	if (res)
f17c89bf CH	445	goto out_err;
1da177e4	446
324ef39a VD	447	res = hfsplus_init_inode_security(inode, dir, &dentry->d_name);
	448	if (res == -EOPNOTSUPP)
	449	res = 0; /* Operation is not supported. */
	450	else if (res) {
	451	/* Try to delete anyway without error analysis. */
	452	hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
	453	goto out_err;
	454	}
	455
f17c89bf CH	456	hfsplus_instantiate(dentry, inode, inode->i_ino);
f17c89bf CH	457	mark_inode_dirty(inode);
7ac9fb9c	458	goto out;
1da177e4	459
f17c89bf	460	out_err:
6d6b77f1	461	clear_nlink(inode);
f17c89bf CH	462	hfsplus_delete_inode(inode);
f17c89bf CH	463	iput(inode);
7ac9fb9c CH	464	out:
7ac9fb9c CH	465	mutex_unlock(&sbi->vh_mutex);
1da177e4 LT	466	return res;
	467	}
	468
	469	static int hfsplus_mknod(struct inode dir, struct dentry dentry,
1a67aafb	470	umode_t mode, dev_t rdev)
1da177e4	471	{
7ac9fb9c	472	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
1da177e4	473	struct inode *inode;
7ac9fb9c	474	int res = -ENOSPC;
1da177e4	475
7ac9fb9c	476	mutex_lock(&sbi->vh_mutex);
30d3abbe	477	inode = hfsplus_new_inode(dir->i_sb, mode);
1da177e4	478	if (!inode)
7ac9fb9c	479	goto out;
1da177e4	480
90e61690 CH	481	if (S_ISBLK(mode) \|\| S_ISCHR(mode) \|\| S_ISFIFO(mode) \|\| S_ISSOCK(mode))
	482	init_special_inode(inode, mode, rdev);
	483
1da177e4	484	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
324ef39a VD	485	if (res)
	486	goto failed_mknod;
	487
	488	res = hfsplus_init_inode_security(inode, dir, &dentry->d_name);
	489	if (res == -EOPNOTSUPP)
	490	res = 0; /* Operation is not supported. */
	491	else if (res) {
	492	/* Try to delete anyway without error analysis. */
	493	hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
	494	goto failed_mknod;
1da177e4	495	}
30d3abbe	496
1da177e4 LT	497	hfsplus_instantiate(dentry, inode, inode->i_ino);
1da177e4 LT	498	mark_inode_dirty(inode);
324ef39a VD	499	goto out;
	500
	501	failed_mknod:
	502	clear_nlink(inode);
	503	hfsplus_delete_inode(inode);
	504	iput(inode);
7ac9fb9c CH	505	out:
	506	mutex_unlock(&sbi->vh_mutex);
	507	return res;
1da177e4 LT	508	}
1da177e4 LT	509
4acdaf27	510	static int hfsplus_create(struct inode dir, struct dentry dentry, umode_t mode,
ebfc3b49	511	bool excl)
30d3abbe CH	512	{
	513	return hfsplus_mknod(dir, dentry, mode, 0);
	514	}
	515
18bb1db3	516	static int hfsplus_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
30d3abbe CH	517	{
	518	return hfsplus_mknod(dir, dentry, mode \| S_IFDIR, 0);
	519	}
	520
1da177e4 LT	521	static int hfsplus_rename(struct inode old_dir, struct dentry old_dentry,
	522	struct inode new_dir, struct dentry new_dentry)
	523	{
	524	int res;
	525
	526	/* Unlink destination if it already exists */
	527	if (new_dentry->d_inode) {
e3911785	528	if (S_ISDIR(new_dentry->d_inode->i_mode))
40de9a7c	529	res = hfsplus_rmdir(new_dir, new_dentry);
e3911785	530	else
40de9a7c	531	res = hfsplus_unlink(new_dir, new_dentry);
1da177e4 LT	532	if (res)
	533	return res;
	534	}
	535
	536	res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
	537	old_dir, &old_dentry->d_name,
	538	new_dir, &new_dentry->d_name);
	539	if (!res)
	540	new_dentry->d_fsdata = old_dentry->d_fsdata;
	541	return res;
	542	}
	543
92e1d5be	544	const struct inode_operations hfsplus_dir_inode_operations = {
324ef39a VD	545	.lookup = hfsplus_lookup,
	546	.create = hfsplus_create,
	547	.link = hfsplus_link,
	548	.unlink = hfsplus_unlink,
	549	.mkdir = hfsplus_mkdir,
	550	.rmdir = hfsplus_rmdir,
	551	.symlink = hfsplus_symlink,
	552	.mknod = hfsplus_mknod,
	553	.rename = hfsplus_rename,
	554	.setxattr = generic_setxattr,
	555	.getxattr = generic_getxattr,
	556	.listxattr = hfsplus_listxattr,
b168fff7	557	.removexattr = generic_removexattr,
b4c1107c VD	558	#ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
b4c1107c VD	559	.get_acl = hfsplus_get_posix_acl,
b0a7ab57	560	.set_acl = hfsplus_set_posix_acl,
b4c1107c	561	#endif
1da177e4 LT	562	};
1da177e4 LT	563
4b6f5d20	564	const struct file_operations hfsplus_dir_operations = {
eb29d66d	565	.fsync = hfsplus_file_fsync,
1da177e4	566	.read = generic_read_dir,
e72514e7	567	.iterate = hfsplus_readdir,
7cc4bcc6	568	.unlocked_ioctl = hfsplus_ioctl,
1da177e4 LT	569	.llseek = generic_file_llseek,
	570	.release = hfsplus_dir_release,
	571	};