@@ -24,6 +24,55 @@
#include <asm/uaccess.h>
+static const char *
+strcmp_prefix(const char *a, const char *a_prefix)
+{
+ while (*a_prefix && *a == *a_prefix) {
+ a++;
+ a_prefix++;
+ }
+ return *a_prefix ? NULL : a;
+}
+
+/*
+ * In order to implement different sets of xattr operations for each xattr
+ * prefix with the generic xattr API, a filesystem should create a
+ * null-terminated array of struct xattr_handler (one for each prefix) and
+ * hang a pointer to it off of the s_xattr field of the superblock.
+ *
+ * The generic_fooxattr() functions will use this list to dispatch xattr
+ * operations to the correct xattr_handler.
+ */
+#define for_each_xattr_handler(handlers, handler) \
+ for ((handler) = *(handlers)++; \
+ (handler) != NULL; \
+ (handler) = *(handlers)++)
+
+/*
+ * Find the xattr_handler with the matching prefix.
+ */
+static const struct xattr_handler *
+xattr_resolve_name(const struct xattr_handler **handlers, const char **name)
+{
+ const struct xattr_handler *handler;
+
+ for_each_xattr_handler(handlers, handler) {
+ const char *n;
+
+ n = strcmp_prefix(*name, xattr_prefix(handler));
+ if (n) {
+ if (!handler->prefix ^ !*n) {
+ if (*n)
+ continue;
+ return ERR_PTR(-EINVAL);
+ }
+ *name = n;
+ return handler;
+ }
+ }
+ return ERR_PTR(-EOPNOTSUPP);
+}
+
/*
* Check permissions for extended attribute access. This is a bit complicated
* because different namespaces have very different rules.
@@ -634,56 +683,6 @@ SYSCALL_DEFINE2(fremovexattr, int, fd, const char __user *, name)
return error;
}
-
-static const char *
-strcmp_prefix(const char *a, const char *a_prefix)
-{
- while (*a_prefix && *a == *a_prefix) {
- a++;
- a_prefix++;
- }
- return *a_prefix ? NULL : a;
-}
-
-/*
- * In order to implement different sets of xattr operations for each xattr
- * prefix with the generic xattr API, a filesystem should create a
- * null-terminated array of struct xattr_handler (one for each prefix) and
- * hang a pointer to it off of the s_xattr field of the superblock.
- *
- * The generic_fooxattr() functions will use this list to dispatch xattr
- * operations to the correct xattr_handler.
- */
-#define for_each_xattr_handler(handlers, handler) \
- for ((handler) = *(handlers)++; \
- (handler) != NULL; \
- (handler) = *(handlers)++)
-
-/*
- * Find the xattr_handler with the matching prefix.
- */
-static const struct xattr_handler *
-xattr_resolve_name(const struct xattr_handler **handlers, const char **name)
-{
- const struct xattr_handler *handler;
-
- for_each_xattr_handler(handlers, handler) {
- const char *n;
-
- n = strcmp_prefix(*name, xattr_prefix(handler));
- if (n) {
- if (!handler->prefix ^ !*n) {
- if (*n)
- continue;
- return ERR_PTR(-EINVAL);
- }
- *name = n;
- return handler;
- }
- }
- return ERR_PTR(-EOPNOTSUPP);
-}
-
/*
* Find the handler for the prefix and dispatch its get() operation.
*/
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> --- fs/xattr.c | 99 +++++++++++++++++++++++++++++++------------------------------- 1 file changed, 49 insertions(+), 50 deletions(-)