fs/hfs/dir.c - kernel/msm-5.4 - Gitiles

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

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

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

 	dentry->d_op = &hfs_dentry_operations;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

 	return res;
 }

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

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

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

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

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

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

 struct inode_operations hfs_dir_inode_operations = {
 	.create		= hfs_create,
 	.lookup		= hfs_lookup,
 	.unlink		= hfs_unlink,
 	.mkdir		= hfs_mkdir,
 	.rmdir		= hfs_rmdir,
 	.rename		= hfs_rename,
 	.setattr	= hfs_inode_setattr,
 };
	/*
	* linux/fs/hfs/dir.c
	*
	* Copyright (C) 1995-1997 Paul H. Hargrove
	* (C) 2003 Ardis Technologies <roman@ardistech.com>
	* This file may be distributed under the terms of the GNU General Public License.
	*
	* This file contains directory-related functions independent of which
	* scheme is being used to represent forks.
	*
	* Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
	*/

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

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

	dentry->d_op = &hfs_dentry_operations;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return res;
	}

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

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

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

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

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

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

	struct inode_operations hfs_dir_inode_operations = {
	.create = hfs_create,
	.lookup = hfs_lookup,
	.unlink = hfs_unlink,
	.mkdir = hfs_mkdir,
	.rmdir = hfs_rmdir,
	.rename = hfs_rename,
	.setattr = hfs_inode_setattr,
	};