btrfs-progs: gitignore: Ignore *.restored test image

[platform/upstream/btrfs-progs.git] / send-utils.h

diff --git a/send-utils.h b/send-utils.h
index 78abf94..e8f8691 100644 (file)
--- a/send-utils.h
+++ b/send-utils.h
@@ -15,13 +15,16 @@
  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  * Boston, MA 021110-1307, USA.
  */
-#ifndef SEND_UTILS_H_
-#define SEND_UTILS_H_
+
+#ifndef __BTRFS_SEND_UTILS_H__
+#define __BTRFS_SEND_UTILS_H__
 
 #if BTRFS_FLAT_INCLUDES
+#include "kerncompat.h"
 #include "ctree.h"
 #include "rbtree.h"
 #else
+#include <btrfs/kerncompat.h>
 #include <btrfs/ctree.h>
 #include <btrfs/rbtree.h>
 #endif /* BTRFS_FLAT_INCLUDES */
@@ -30,6 +33,12 @@
 extern "C" {
 #endif
 
+/*
+ * Compatibility code for kernels < 3.12; the UUID tree is not available there
+ * and we have to do the slow search. This should be deprecated someday.
+ */
+#define BTRFS_COMPAT_SEND_NO_UUID_TREE 1
+
 enum subvol_search_type {
        subvol_search_by_root_id,
        subvol_search_by_uuid,
@@ -38,10 +47,13 @@ enum subvol_search_type {
 };
 
 struct subvol_info {
+#ifdef BTRFS_COMPAT_SEND_NO_UUID_TREE
        struct rb_node rb_root_id_node;
        struct rb_node rb_local_node;
        struct rb_node rb_received_node;
        struct rb_node rb_path_node;
+#endif
+
        u64 root_id;
        u8 uuid[BTRFS_UUID_SIZE];
        u8 parent_uuid[BTRFS_UUID_SIZE];
@@ -55,28 +67,57 @@ struct subvol_info {
 };
 
 struct subvol_uuid_search {
+       int mnt_fd;
+#ifdef BTRFS_COMPAT_SEND_NO_UUID_TREE
+       int uuid_tree_existed;
+
        struct rb_root root_id_subvols;
        struct rb_root local_subvols;
        struct rb_root received_subvols;
        struct rb_root path_subvols;
+#endif
 };
 
 int subvol_uuid_search_init(int mnt_fd, struct subvol_uuid_search *s);
 void subvol_uuid_search_finit(struct subvol_uuid_search *s);
+/*
+ * Search for a subvolume by given type (received uuid, root id, path), returns
+ * pointer to newly allocated struct subvol_info or NULL in case it's not found
+ * or there was another error. This ambiguity of error value is fixed by
+ * subvol_uuid_search2 that returns a negative errno in case of an error, of a
+ * valid pointer otherwise.
+ *
+ * This function will be deprecated in the future, please consider using v2 in
+ * new code unless you need to keep backward compatibility with older
+ * btrfs-progs.
+ */
 struct subvol_info *subvol_uuid_search(struct subvol_uuid_search *s,
                                       u64 root_id, const u8 *uuid, u64 transid,
                                       const char *path,
                                       enum subvol_search_type type);
+struct subvol_info *subvol_uuid_search2(struct subvol_uuid_search *s,
+                                      u64 root_id, const u8 *uuid, u64 transid,
+                                      const char *path,
+                                      enum subvol_search_type type);
 void subvol_uuid_search_add(struct subvol_uuid_search *s,
                            struct subvol_info *si);
 
+int btrfs_subvolid_resolve(int fd, char *path, size_t path_len, u64 subvol_id);
 
-
+/*
+ * DEPRECATED: the functions path_cat and path_cat3 are unsafe and should not
+ * be used, use the _out variants and always check the return code.
+ */
+__attribute__((deprecated))
 char *path_cat(const char *p1, const char *p2);
+__attribute__((deprecated))
 char *path_cat3(const char *p1, const char *p2, const char *p3);
 
+int path_cat_out(char *out, const char *p1, const char *p2);
+int path_cat3_out(char *out, const char *p1, const char *p2, const char *p3);
+
 #ifdef __cplusplus
 }
 #endif
 
-#endif /* SEND_UTILS_H_ */
+#endif