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