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