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super1: update data_size when performing "revert-reshape". 

The "data_size" is with respect to "data_offset".  When the kernel
changes "data_offset" it modifies "data_size" to match - see
md_finish_reshape() in the kernel.

So when mdadm switches the data_offset for the new data_offset, it
must update data_size correspondingly.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2013-07-24 10:21:27 +10:00
parent 4441541f1f
commit 419e018284
1 changed files with 4 additions and 3 deletions
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7
super1.c
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@ -1304,9 +1304,10 @@ static int update_super1(struct supertype *st, struct mdinfo *info,
sb->chunksize = temp;
if (sb->feature_map & __cpu_to_le32(MD_FEATURE_NEW_OFFSET)) {
sb->data_offset = __cpu_to_le64(__le64_to_cpu(sb->data_offset) +
(long)(int32_t)__le32_to_cpu(sb->new_offset));
sb->new_offset = __cpu_to_le32(-(int32_t)__le32_to_cpu(sb->new_offset));
long offset_delta = (int32_t)__le32_to_cpu(sb->new_offset);
sb->data_offset = __cpu_to_le64(__le64_to_cpu(sb->data_offset) + offset_delta);
sb->new_offset = __cpu_to_le32(-offset_delta);
sb->data_size = __cpu_to_le64(__le64_to_cpu(sb->data_size) - offset_delta);
}
}
} else if (strcmp(update, "_reshape_progress")==0)