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md: superblock changes for PPL

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Include information about PPL location and size into mdp_superblock_1
and copy it to/from rdev. Because PPL is mutually exclusive with bitmap,
put it in place of 'bitmap_offset'. Add a new flag MD_FEATURE_PPL for
'feature_map', analogically to MD_FEATURE_BITMAP_OFFSET. Add MD_HAS_PPL
to mddev->flags to indicate that PPL is enabled on an array.

Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Artur Paszkiewicz
2017-03-09 09:59:57 +01:00
committed by Shaohua Li
parent effe6ee752
commit ea0213e0c7
5 changed files with 45 additions and 6 deletions
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3
drivers/md/raid1.c
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@@ -47,7 +47,8 @@
#define UNSUPPORTED_MDDEV_FLAGS \
((1L << MD_HAS_JOURNAL) | \
(1L << MD_JOURNAL_CLEAN))
(1L << MD_JOURNAL_CLEAN) | \
(1L << MD_HAS_PPL))
/*
* Number of guaranteed r1bios in case of extreme VM load: