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-rw-r--r--fs/hfs/attr.c153
1 files changed, 153 insertions, 0 deletions
diff --git a/fs/hfs/attr.c b/fs/hfs/attr.c
new file mode 100644
index 0000000000..6341bb2482
--- /dev/null
+++ b/fs/hfs/attr.c
@@ -0,0 +1,153 @@
+// 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 mnt_idmap *idmap,
+ 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
+};