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md: Runtime support for multiple ppls

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Increase PPL area to 1MB and use it as circular buffer to store PPL. The
entry with highest generation number is the latest one. If PPL to be
written is larger then space left in a buffer, rewind the buffer to the
start (don't wrap it).

Signed-off-by: Pawel Baldysiak <pawel.baldysiak@intel.com>
Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Pawel Baldysiak
2017-08-16 17:13:45 +02:00
committed by Shaohua Li
parent 8a8e6f84ad
commit ddc088238c
7 changed files with 62 additions and 9 deletions
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16
drivers/md/md.c
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@@ -1536,7 +1536,8 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_
} else if (sb->bblog_offset != 0)
rdev->badblocks.shift = 0;
if (le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) {
if ((le32_to_cpu(sb->feature_map) &
(MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) {
rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
rdev->ppl.size = le16_to_cpu(sb->ppl.size);
rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
@@ -1655,10 +1656,15 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
set_bit(MD_HAS_JOURNAL, &mddev->flags);
if (le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) {
if (le32_to_cpu(sb->feature_map) &
(MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) {
if (le32_to_cpu(sb->feature_map) &
(MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL))
return -EINVAL;
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) &&
(le32_to_cpu(sb->feature_map) &
MD_FEATURE_MULTIPLE_PPLS))
return -EINVAL;
set_bit(MD_HAS_PPL, &mddev->flags);
}
} else if (mddev->pers == NULL) {
@@ -1875,7 +1881,11 @@ retry:
sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
if (test_bit(MD_HAS_PPL, &mddev->flags)) {
sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
sb->feature_map |=
cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS);
else
sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL);
sb->ppl.offset = cpu_to_le16(rdev->ppl.offset);
sb->ppl.size = cpu_to_le16(rdev->ppl.size);
}