This is a preparetion work to allow normal user to call
"subvolume list/show".
Signed-off-by: Tomohiro Misono <misono.tomoh...@jp.fujitsu.com>
---
btrfs-list.c | 33 +++++++++++++++++++++++++++++++++
btrfs-list.h | 1 +
2 files changed, 34 insertions(+)
diff --git a/btrfs-list.c b/btrfs-list.c
index 50e5ce5f..88689a9d 100644
--- a/btrfs-list.c
+++ b/btrfs-list.c
@@ -958,6 +958,39 @@ out:
return 0;
}
+/*
+ * Check the permission for tree search ioctl by searching a key
+ * which alwasys exists
+ */
+int check_perm_for_tree_search(int fd)
+{
+ struct btrfs_ioctl_search_args args;
+ struct btrfs_ioctl_search_key *sk = &args.key;
+ int ret;
+
+ memset(&args, 0, sizeof(args));
+ sk->tree_id = BTRFS_ROOT_TREE_OBJECTID;
+ sk->min_objectid = BTRFS_EXTENT_TREE_OBJECTID;
+ sk->max_objectid = BTRFS_EXTENT_TREE_OBJECTID;
+ sk->min_type = BTRFS_ROOT_ITEM_KEY;
+ sk->max_type = BTRFS_ROOT_ITEM_KEY;
+ sk->min_offset = 0;
+ sk->max_offset = (u64)-1;
+ sk->min_transid = 0;
+ sk->max_transid = (u64)-1;
+ sk->nr_items = 1;
+ ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
+
+ if (!ret)
+ ret = 1;
+ else if (ret < 0 && errno == EPERM)
+ ret = 0;
+ else
+ ret = -errno;
+
+ return ret;
+}
+
static int list_subvol_search(int fd, struct root_lookup *root_lookup)
{
int ret;
diff --git a/btrfs-list.h b/btrfs-list.h
index 6e5fc778..6225311d 100644
--- a/btrfs-list.h
+++ b/btrfs-list.h
@@ -176,5 +176,6 @@ char *btrfs_list_path_for_root(int fd, u64 root);
int btrfs_list_get_path_rootid(int fd, u64 *treeid);
int btrfs_get_subvol(int fd, struct root_info *the_ri);
int btrfs_get_toplevel_subvol(int fd, struct root_info *the_ri);
+int check_perm_for_tree_search(int fd);
#endif
--
2.14.3
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
