[mirror_ubuntu-bionic-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 <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) {
			if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
				pr_err("small file entry\n");
				err = -EIO;
				goto out;
			}
			if (!dir_emit(ctx, strbuf, len,
				    be32_to_cpu(entry.file.id), DT_REG))
				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) {
	221	if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
d6142673	222	pr_err("small file entry\n");
1da177e4 LT	223	err = -EIO;
	224	goto out;
	225	}
e72514e7	226	if (!dir_emit(ctx, strbuf, len,
1da177e4 LT	227	be32_to_cpu(entry.file.id), DT_REG))
	228	break;
	229	} else {
d6142673	230	pr_err("bad catalog entry type\n");
1da177e4 LT	231	err = -EIO;
	232	goto out;
	233	}
20b7643d	234	next:
e72514e7 AV	235	ctx->pos++;
e72514e7 AV	236	if (ctx->pos >= inode->i_size)
1da177e4 LT	237	goto out;
	238	err = hfs_brec_goto(&fd, 1);
	239	if (err)
	240	goto out;
	241	}
e72514e7	242	rd = file->private_data;
1da177e4 LT	243	if (!rd) {
	244	rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
	245	if (!rd) {
	246	err = -ENOMEM;
	247	goto out;
	248	}
e72514e7 AV	249	file->private_data = rd;
e72514e7 AV	250	rd->file = file;
6af502de	251	list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
1da177e4 LT	252	}
	253	memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
	254	out:
017f8da4	255	kfree(strbuf);
1da177e4 LT	256	hfs_find_exit(&fd);
	257	return err;
	258	}
	259
	260	static int hfsplus_dir_release(struct inode inode, struct file file)
	261	{
	262	struct hfsplus_readdir_data *rd = file->private_data;
	263	if (rd) {
89755dca	264	mutex_lock(&inode->i_mutex);
1da177e4	265	list_del(&rd->list);
89755dca	266	mutex_unlock(&inode->i_mutex);
1da177e4 LT	267	kfree(rd);
	268	}
	269	return 0;
	270	}
	271
1da177e4 LT	272	static int hfsplus_link(struct dentry src_dentry, struct inode dst_dir,
	273	struct dentry *dst_dentry)
	274	{
dd73a01a	275	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb);
1da177e4 LT	276	struct inode *inode = src_dentry->d_inode;
	277	struct inode *src_dir = src_dentry->d_parent->d_inode;
	278	struct qstr str;
	279	char name[32];
	280	u32 cnid, id;
	281	int res;
	282
	283	if (HFSPLUS_IS_RSRC(inode))
	284	return -EPERM;
f6089ff8 CH	285	if (!S_ISREG(inode->i_mode))
f6089ff8 CH	286	return -EPERM;
1da177e4	287
7ac9fb9c	288	mutex_lock(&sbi->vh_mutex);
1da177e4 LT	289	if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
	290	for (;;) {
	291	get_random_bytes(&id, sizeof(cnid));
	292	id &= 0x3fffffff;
	293	str.name = name;
	294	str.len = sprintf(name, "iNode%d", id);
	295	res = hfsplus_rename_cat(inode->i_ino,
	296	src_dir, &src_dentry->d_name,
dd73a01a	297	sbi->hidden_dir, &str);
1da177e4 LT	298	if (!res)
	299	break;
	300	if (res != -EEXIST)
7ac9fb9c	301	goto out;
1da177e4	302	}
f6089ff8	303	HFSPLUS_I(inode)->linkid = id;
dd73a01a	304	cnid = sbi->next_cnid++;
1da177e4	305	src_dentry->d_fsdata = (void *)(unsigned long)cnid;
2753cc28 AS	306	res = hfsplus_create_cat(cnid, src_dir,
2753cc28 AS	307	&src_dentry->d_name, inode);
1da177e4 LT	308	if (res)
1da177e4 LT	309	/* panic? */
7ac9fb9c	310	goto out;
dd73a01a	311	sbi->file_count++;
1da177e4	312	}
dd73a01a	313	cnid = sbi->next_cnid++;
1da177e4 LT	314	res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
1da177e4 LT	315	if (res)
7ac9fb9c	316	goto out;
1da177e4	317
d8c76e6f	318	inc_nlink(inode);
1da177e4	319	hfsplus_instantiate(dst_dentry, inode, cnid);
7de9c6ee	320	ihold(inode);
1da177e4 LT	321	inode->i_ctime = CURRENT_TIME_SEC;
1da177e4 LT	322	mark_inode_dirty(inode);
dd73a01a	323	sbi->file_count++;
9e6c5829	324	hfsplus_mark_mdb_dirty(dst_dir->i_sb);
7ac9fb9c CH	325	out:
	326	mutex_unlock(&sbi->vh_mutex);
	327	return res;
1da177e4 LT	328	}
	329
	330	static int hfsplus_unlink(struct inode dir, struct dentry dentry)
	331	{
dd73a01a	332	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
1da177e4 LT	333	struct inode *inode = dentry->d_inode;
	334	struct qstr str;
	335	char name[32];
	336	u32 cnid;
	337	int res;
	338
	339	if (HFSPLUS_IS_RSRC(inode))
	340	return -EPERM;
	341
7ac9fb9c	342	mutex_lock(&sbi->vh_mutex);
1da177e4 LT	343	cnid = (u32)(unsigned long)dentry->d_fsdata;
1da177e4 LT	344	if (inode->i_ino == cnid &&
6af502de	345	atomic_read(&HFSPLUS_I(inode)->opencnt)) {
1da177e4 LT	346	str.name = name;
	347	str.len = sprintf(name, "temp%lu", inode->i_ino);
	348	res = hfsplus_rename_cat(inode->i_ino,
	349	dir, &dentry->d_name,
dd73a01a	350	sbi->hidden_dir, &str);
85b8fe8c	351	if (!res) {
1da177e4	352	inode->i_flags \|= S_DEAD;
85b8fe8c CH	353	drop_nlink(inode);
85b8fe8c CH	354	}
7ac9fb9c	355	goto out;
1da177e4 LT	356	}
	357	res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
	358	if (res)
7ac9fb9c	359	goto out;
1da177e4	360
af8c85bb	361	if (inode->i_nlink > 0)
9a53c3a7	362	drop_nlink(inode);
76b0c26a RZ	363	if (inode->i_ino == cnid)
	364	clear_nlink(inode);
	365	if (!inode->i_nlink) {
	366	if (inode->i_ino != cnid) {
dd73a01a	367	sbi->file_count--;
6af502de	368	if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) {
76b0c26a	369	res = hfsplus_delete_cat(inode->i_ino,
dd73a01a	370	sbi->hidden_dir,
76b0c26a RZ	371	NULL);
	372	if (!res)
	373	hfsplus_delete_inode(inode);
	374	} else
	375	inode->i_flags \|= S_DEAD;
1da177e4	376	} else
76b0c26a	377	hfsplus_delete_inode(inode);
af8c85bb	378	} else
dd73a01a	379	sbi->file_count--;
1da177e4 LT	380	inode->i_ctime = CURRENT_TIME_SEC;
1da177e4 LT	381	mark_inode_dirty(inode);
7ac9fb9c CH	382	out:
7ac9fb9c CH	383	mutex_unlock(&sbi->vh_mutex);
1da177e4 LT	384	return res;
	385	}
	386
1da177e4 LT	387	static int hfsplus_rmdir(struct inode dir, struct dentry dentry)
1da177e4 LT	388	{
7ac9fb9c CH	389	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
7ac9fb9c CH	390	struct inode *inode = dentry->d_inode;
1da177e4 LT	391	int res;
1da177e4 LT	392
1da177e4 LT	393	if (inode->i_size != 2)
1da177e4 LT	394	return -ENOTEMPTY;
7ac9fb9c CH	395
7ac9fb9c CH	396	mutex_lock(&sbi->vh_mutex);
1da177e4 LT	397	res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
1da177e4 LT	398	if (res)
7ac9fb9c	399	goto out;
ce71ec36	400	clear_nlink(inode);
1da177e4 LT	401	inode->i_ctime = CURRENT_TIME_SEC;
	402	hfsplus_delete_inode(inode);
	403	mark_inode_dirty(inode);
7ac9fb9c CH	404	out:
	405	mutex_unlock(&sbi->vh_mutex);
	406	return res;
1da177e4 LT	407	}
	408
	409	static int hfsplus_symlink(struct inode dir, struct dentry dentry,
	410	const char *symname)
	411	{
7ac9fb9c	412	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
1da177e4	413	struct inode *inode;
7ac9fb9c	414	int res = -ENOSPC;
1da177e4	415
7ac9fb9c	416	mutex_lock(&sbi->vh_mutex);
f17c89bf	417	inode = hfsplus_new_inode(dir->i_sb, S_IFLNK \| S_IRWXUGO);
1da177e4	418	if (!inode)
7ac9fb9c	419	goto out;
1da177e4 LT	420
1da177e4 LT	421	res = page_symlink(inode, symname, strlen(symname) + 1);
f17c89bf CH	422	if (res)
f17c89bf CH	423	goto out_err;
1da177e4	424
1da177e4	425	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
f17c89bf CH	426	if (res)
f17c89bf CH	427	goto out_err;
1da177e4	428
324ef39a VD	429	res = hfsplus_init_inode_security(inode, dir, &dentry->d_name);
	430	if (res == -EOPNOTSUPP)
	431	res = 0; /* Operation is not supported. */
	432	else if (res) {
	433	/* Try to delete anyway without error analysis. */
	434	hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
	435	goto out_err;
	436	}
	437
f17c89bf CH	438	hfsplus_instantiate(dentry, inode, inode->i_ino);
f17c89bf CH	439	mark_inode_dirty(inode);
7ac9fb9c	440	goto out;
1da177e4	441
f17c89bf	442	out_err:
6d6b77f1	443	clear_nlink(inode);
f17c89bf CH	444	hfsplus_delete_inode(inode);
f17c89bf CH	445	iput(inode);
7ac9fb9c CH	446	out:
7ac9fb9c CH	447	mutex_unlock(&sbi->vh_mutex);
1da177e4 LT	448	return res;
	449	}
	450
	451	static int hfsplus_mknod(struct inode dir, struct dentry dentry,
1a67aafb	452	umode_t mode, dev_t rdev)
1da177e4	453	{
7ac9fb9c	454	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
1da177e4	455	struct inode *inode;
7ac9fb9c	456	int res = -ENOSPC;
1da177e4	457
7ac9fb9c	458	mutex_lock(&sbi->vh_mutex);
30d3abbe	459	inode = hfsplus_new_inode(dir->i_sb, mode);
1da177e4	460	if (!inode)
7ac9fb9c	461	goto out;
1da177e4	462
90e61690 CH	463	if (S_ISBLK(mode) \|\| S_ISCHR(mode) \|\| S_ISFIFO(mode) \|\| S_ISSOCK(mode))
	464	init_special_inode(inode, mode, rdev);
	465
1da177e4	466	res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
324ef39a VD	467	if (res)
	468	goto failed_mknod;
	469
	470	res = hfsplus_init_inode_security(inode, dir, &dentry->d_name);
	471	if (res == -EOPNOTSUPP)
	472	res = 0; /* Operation is not supported. */
	473	else if (res) {
	474	/* Try to delete anyway without error analysis. */
	475	hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
	476	goto failed_mknod;
1da177e4	477	}
30d3abbe	478
1da177e4 LT	479	hfsplus_instantiate(dentry, inode, inode->i_ino);
1da177e4 LT	480	mark_inode_dirty(inode);
324ef39a VD	481	goto out;
	482
	483	failed_mknod:
	484	clear_nlink(inode);
	485	hfsplus_delete_inode(inode);
	486	iput(inode);
7ac9fb9c CH	487	out:
	488	mutex_unlock(&sbi->vh_mutex);
	489	return res;
1da177e4 LT	490	}
1da177e4 LT	491
4acdaf27	492	static int hfsplus_create(struct inode dir, struct dentry dentry, umode_t mode,
ebfc3b49	493	bool excl)
30d3abbe CH	494	{
	495	return hfsplus_mknod(dir, dentry, mode, 0);
	496	}
	497
18bb1db3	498	static int hfsplus_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
30d3abbe CH	499	{
	500	return hfsplus_mknod(dir, dentry, mode \| S_IFDIR, 0);
	501	}
	502
1da177e4 LT	503	static int hfsplus_rename(struct inode old_dir, struct dentry old_dentry,
	504	struct inode new_dir, struct dentry new_dentry)
	505	{
	506	int res;
	507
	508	/* Unlink destination if it already exists */
	509	if (new_dentry->d_inode) {
e3911785	510	if (S_ISDIR(new_dentry->d_inode->i_mode))
40de9a7c	511	res = hfsplus_rmdir(new_dir, new_dentry);
e3911785	512	else
40de9a7c	513	res = hfsplus_unlink(new_dir, new_dentry);
1da177e4 LT	514	if (res)
	515	return res;
	516	}
	517
	518	res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
	519	old_dir, &old_dentry->d_name,
	520	new_dir, &new_dentry->d_name);
	521	if (!res)
	522	new_dentry->d_fsdata = old_dentry->d_fsdata;
	523	return res;
	524	}
	525
92e1d5be	526	const struct inode_operations hfsplus_dir_inode_operations = {
324ef39a VD	527	.lookup = hfsplus_lookup,
	528	.create = hfsplus_create,
	529	.link = hfsplus_link,
	530	.unlink = hfsplus_unlink,
	531	.mkdir = hfsplus_mkdir,
	532	.rmdir = hfsplus_rmdir,
	533	.symlink = hfsplus_symlink,
	534	.mknod = hfsplus_mknod,
	535	.rename = hfsplus_rename,
	536	.setxattr = generic_setxattr,
	537	.getxattr = generic_getxattr,
	538	.listxattr = hfsplus_listxattr,
b168fff7	539	.removexattr = generic_removexattr,
b4c1107c VD	540	#ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
b4c1107c VD	541	.get_acl = hfsplus_get_posix_acl,
b0a7ab57	542	.set_acl = hfsplus_set_posix_acl,
b4c1107c	543	#endif
1da177e4 LT	544	};
1da177e4 LT	545
4b6f5d20	546	const struct file_operations hfsplus_dir_operations = {
eb29d66d	547	.fsync = hfsplus_file_fsync,
1da177e4	548	.read = generic_read_dir,
e72514e7	549	.iterate = hfsplus_readdir,
7cc4bcc6	550	.unlocked_ioctl = hfsplus_ioctl,
1da177e4 LT	551	.llseek = generic_file_llseek,
	552	.release = hfsplus_dir_release,
	553	};