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md: add feature flag MD_FEATURE_RAID0_LAYOUT

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Due to a bug introduced in Linux 3.14 we cannot determine the
correctly layout for a multi-zone RAID0 array - there are two
possibilities.

It is possible to tell the kernel which to chose using a module
parameter, but this can be clumsy to use.  It would be best if
the choice were recorded in the metadata.
So add a feature flag for this purpose.
If it is set, then the 'layout' field of the superblock is used
to determine which layout to use.

If this flag is not set, then mddev->layout gets set to -1,
which causes the module parameter to be required.

Acked-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
NeilBrown
2019-09-09 16:52:29 +10:00
committed by Song Liu
parent c84a1372df
commit 33f2c35a54
3 changed files with 18 additions and 0 deletions
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13
drivers/md/md.c
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@@ -1237,6 +1237,8 @@ static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
mddev->new_layout = mddev->layout;
mddev->new_chunk_sectors = mddev->chunk_sectors;
}
if (mddev->level == 0)
mddev->layout = -1;
if (sb->state & (1<<MD_SB_CLEAN))
mddev->recovery_cp = MaxSector;
@@ -1652,6 +1654,10 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_
rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
}
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) &&
sb->level != 0)
return -EINVAL;
if (!refdev) {
ret = 1;
} else {
@@ -1762,6 +1768,10 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
mddev->new_chunk_sectors = mddev->chunk_sectors;
}
if (mddev->level == 0 &&
!(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT))
mddev->layout = -1;
if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
set_bit(MD_HAS_JOURNAL, &mddev->flags);
@@ -6898,6 +6908,9 @@ static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
mddev->external = 0;
mddev->layout = info->layout;
if (mddev->level == 0)
/* Cannot trust RAID0 layout info here */
mddev->layout = -1;
mddev->chunk_sectors = info->chunk_size >> 9;
if (mddev->persistent) {