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// SPDX-License-Identifier: GPL-2.0
/*
* linux/fs/hfs/attr.c
*
* (C) 2003 Ardis Technologies <roman@ardistech.com>
*
* Export hfs data via xattr
*/
#include <linux/fs.h>
#include <linux/xattr.h>
#include "hfs_fs.h"
#include "btree.h"
enum hfs_xattr_type {
HFS_TYPE,
HFS_CREATOR,
};
static int __hfs_setxattr(struct inode *inode, enum hfs_xattr_type type,
const void *value, size_t size, int flags)
{
struct hfs_find_data fd;
hfs_cat_rec rec;
struct hfs_cat_file *file;
int res;
if (!S_ISREG(inode->i_mode) || HFS_IS_RSRC(inode))
return -EOPNOTSUPP;
res = hfs_find_init(HFS_SB(inode->i_sb)->cat_tree, &fd);
if (res)
return res;
fd.search_key->cat = HFS_I(inode)->cat_key;
res = hfs_brec_find(&fd);
if (res)
goto out;
hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
sizeof(struct hfs_cat_file));
file = &rec.file;
switch (type) {
case HFS_TYPE:
if (size == 4)
memcpy(&file->UsrWds.fdType, value, 4);
else
res = -ERANGE;
break;
case HFS_CREATOR:
if (size == 4)
memcpy(&file->UsrWds.fdCreator, value, 4);
else
res = -ERANGE;
break;
}
if (!res)
hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
sizeof(struct hfs_cat_file));
out:
hfs_find_exit(&fd);
return res;
}
static ssize_t __hfs_getxattr(struct inode *inode, enum hfs_xattr_type type,
void *value, size_t size)
{
struct hfs_find_data fd;
hfs_cat_rec rec;
struct hfs_cat_file *file;
ssize_t res = 0;
if (!S_ISREG(inode->i_mode) || HFS_IS_RSRC(inode))
return -EOPNOTSUPP;
if (size) {
res = hfs_find_init(HFS_SB(inode->i_sb)->cat_tree, &fd);
if (res)
return res;
fd.search_key->cat = HFS_I(inode)->cat_key;
res = hfs_brec_find(&fd);
if (res)
goto out;
hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
sizeof(struct hfs_cat_file));
}
file = &rec.file;
switch (type) {
case HFS_TYPE:
if (size >= 4) {
memcpy(value, &file->UsrWds.fdType, 4);
res = 4;
} else
res = size ? -ERANGE : 4;
break;
case HFS_CREATOR:
if (size >= 4) {
memcpy(value, &file->UsrWds.fdCreator, 4);
res = 4;
} else
res = size ? -ERANGE : 4;
break;
}
out:
if (size)
hfs_find_exit(&fd);
return res;
}
static int hfs_xattr_get(const struct xattr_handler *handler,
struct dentry *unused, struct inode *inode,
const char *name, void *value, size_t size)
{
return __hfs_getxattr(inode, handler->flags, value, size);
}
static int hfs_xattr_set(const struct xattr_handler *handler,
struct user_namespace *mnt_userns,
struct dentry *unused, struct inode *inode,
const char *name, const void *value, size_t size,
int flags)
{
if (!value)
return -EOPNOTSUPP;
return __hfs_setxattr(inode, handler->flags, value, size, flags);
}
static const struct xattr_handler hfs_creator_handler = {
.name = "hfs.creator",
.flags = HFS_CREATOR,
.get = hfs_xattr_get,
.set = hfs_xattr_set,
};
static const struct xattr_handler hfs_type_handler = {
.name = "hfs.type",
.flags = HFS_TYPE,
.get = hfs_xattr_get,
.set = hfs_xattr_set,
};
const struct xattr_handler *hfs_xattr_handlers[] = {
&hfs_creator_handler,
&hfs_type_handler,
NULL
};
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