btrfs-progs: Introduce function to get correct stripe length

Introduce a new function, btrfs_get_chunk_stripe_len() to get correct
stripe length.
This is very handy for lowmem mode, which checks the mapping between
device extent and chunk item.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/volumes.h b/volumes.h
index 699b0bae..fc0a775b 100644
--- a/volumes.h
+++ b/volumes.h
@@ -246,4 +246,7 @@ int btrfs_check_chunk_valid(struct btrfs_root *root,
 			    struct extent_buffer *leaf,
 			    struct btrfs_chunk *chunk,
 			    int slot, u64 logical);
+u64 btrfs_stripe_length(struct btrfs_fs_info *fs_info,
+			struct extent_buffer *leaf,
+			struct btrfs_chunk *chunk);
 #endif