super1: PPL support

Enable creating and assembling raid5 arrays with PPL for 1.x metadata.

When creating, reserve enough space for PPL and store its size and
location in the superblock and set MD_FEATURE_PPL bit. Write an initial
empty header in the PPL area on each device. PPL is stored in the
metadata region reserved for internal write-intent bitmap, so don't
allow using bitmap and PPL together.

While at it, fix two endianness issues in write_empty_r5l_meta_block()
and write_init_super1().

Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Jes Sorensen <Jes.Sorensen@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/mdadm.h b/mdadm.h
index d222cc3..2c7066d 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -302,6 +302,7 @@ struct mdinfo {
 	long			bitmap_offset;	/* 0 == none, 1 == a file */
 	unsigned int		ppl_size;
 	unsigned long long	ppl_sector;
+	int			ppl_offset;
 	unsigned long		safe_mode_delay; /* ms delay to mark clean */
 	int			new_level, delta_disks, new_layout, new_chunk;
 	int			errors;