![Al Viro](/assets/img/avatar_default.png)
merge hfs_unlink() and hfs_rmdir(), while we are at it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
317 lines
7.7 KiB
C
317 lines
7.7 KiB
C
/*
|
|
* 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_remove()
|
|
*
|
|
* This serves as both unlink() and rmdir() in the inode_operations
|
|
* structure for regular HFS directories. The purpose is to delete
|
|
* an existing child, given the inode for the parent directory and
|
|
* the name (and its length) of the existing directory.
|
|
*
|
|
* HFS does not have hardlinks, so both rmdir and unlink set the
|
|
* link count to 0. The only difference is the emptiness check.
|
|
*/
|
|
static int hfs_remove(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
int res;
|
|
|
|
if (S_ISDIR(inode->i_mode) && 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_remove(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_remove,
|
|
.mkdir = hfs_mkdir,
|
|
.rmdir = hfs_remove,
|
|
.rename = hfs_rename,
|
|
.setattr = hfs_inode_setattr,
|
|
};
|