hfsplus: rework functionality of getting, setting and deleting of extended attributes

Rework functionality of getting, setting and deleting of extended attributes.

Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com>
Reported-by: Hin-Tak Leung <htl10@users.sourceforge.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 63 insertions, 0 deletions

diff --git a/fs/hfsplus/xattr_user.c b/fs/hfsplus/xattr_user.c
new file mode 100644
index 000000000000..e34016561ae0
--- /dev/null
+++ b/fs/hfsplus/xattr_user.c
@@ -0,0 +1,63 @@
+/*
+ * linux/fs/hfsplus/xattr_user.c
+ *
+ * Vyacheslav Dubeyko <slava@dubeyko.com>
+ *
+ * Handler for user extended attributes.
+ */
+
+#include "hfsplus_fs.h"
+#include "xattr.h"
+
+static int hfsplus_user_getxattr(struct dentry *dentry, const char *name,
+                                        void *buffer, size_t size, int type)
+{
+        char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
+        size_t len = strlen(name);
+
+        if (!strcmp(name, ""))
+                return -EINVAL;
+
+        if (len + XATTR_USER_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
+                return -EOPNOTSUPP;
+
+        strcpy(xattr_name, XATTR_USER_PREFIX);
+        strcpy(xattr_name + XATTR_USER_PREFIX_LEN, name);
+
+        return hfsplus_getxattr(dentry, xattr_name, buffer, size);
+}
+
+static int hfsplus_user_setxattr(struct dentry *dentry, const char *name,
+                const void *buffer, size_t size, int flags, int type)
+{
+        char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
+        size_t len = strlen(name);
+
+        if (!strcmp(name, ""))
+                return -EINVAL;
+
+        if (len + XATTR_USER_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
+                return -EOPNOTSUPP;
+
+        strcpy(xattr_name, XATTR_USER_PREFIX);
+        strcpy(xattr_name + XATTR_USER_PREFIX_LEN, name);
+
+        return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
+}
+
+static size_t hfsplus_user_listxattr(struct dentry *dentry, char *list,
+                size_t list_size, const char *name, size_t name_len, int type)
+{
+        /*
+         * This method is not used.
+         * It is used hfsplus_listxattr() instead of generic_listxattr().
+         */
+        return -EOPNOTSUPP;
+}
+
+const struct xattr_handler hfsplus_xattr_user_handler = {
+        .prefix = XATTR_USER_PREFIX,
+        .list   = hfsplus_user_listxattr,
+        .get    = hfsplus_user_getxattr,
+        .set    = hfsplus_user_setxattr,
+};