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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-10-24 00:01:43 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-10-24 00:01:43 -0300
commit037d32aa8f748e39844d2a5b607fb063b4583843 (patch)
treeb5fe973d42017b5d8888103b05be7a503fe95f0f /include/uapi
parent670027c507e99521d416994a18a498def9ef2ea3 (diff)
Linux-libre 4.8.4-gnupck-4.8.4-gnu
Diffstat (limited to 'include/uapi')
-rw-r--r--include/uapi/linux/btrfs.h12
1 files changed, 11 insertions, 1 deletions
diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index ac5eacd30..db4c253f8 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -239,7 +239,17 @@ struct btrfs_ioctl_fs_info_args {
* Used by:
* struct btrfs_ioctl_feature_flags
*/
-#define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE (1ULL << 0)
+#define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE (1ULL << 0)
+/*
+ * Older kernels (< 4.9) on big-endian systems produced broken free space tree
+ * bitmaps, and btrfs-progs also used to corrupt the free space tree (versions
+ * < 4.7.3). If this bit is clear, then the free space tree cannot be trusted.
+ * btrfs-progs can also intentionally clear this bit to ask the kernel to
+ * rebuild the free space tree, however this might not work on older kernels
+ * that do not know about this bit. If not sure, clear the cache manually on
+ * first mount when booting older kernel versions.
+ */
+#define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID (1ULL << 1)
#define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
#define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)