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md: add feature flag MD_FEATURE_RAID0_LAYOUT 

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
View File

@ -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) {

3
drivers/md/raid0.c
View File

@ -145,6 +145,9 @@ static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf)
if (conf->nr_strip_zones == 1) {
conf->layout = RAID0_ORIG_LAYOUT;
} else if (mddev->layout == RAID0_ORIG_LAYOUT ||
mddev->layout == RAID0_ALT_MULTIZONE_LAYOUT) {
conf->layout = mddev->layout;
} else if (default_layout == RAID0_ORIG_LAYOUT ||
default_layout == RAID0_ALT_MULTIZONE_LAYOUT) {
conf->layout = default_layout;

2
include/uapi/linux/raid/md_p.h
View File

@ -329,6 +329,7 @@ struct mdp_superblock_1 {
#define MD_FEATURE_JOURNAL 512 /* support write cache */
#define MD_FEATURE_PPL 1024 /* support PPL */
#define MD_FEATURE_MULTIPLE_PPLS 2048 /* support for multiple PPLs */
#define MD_FEATURE_RAID0_LAYOUT 4096 /* layout is meaningful for RAID0 */
#define MD_FEATURE_ALL (MD_FEATURE_BITMAP_OFFSET \
|MD_FEATURE_RECOVERY_OFFSET \
|MD_FEATURE_RESHAPE_ACTIVE \
@ -341,6 +342,7 @@ struct mdp_superblock_1 {
|MD_FEATURE_JOURNAL \
|MD_FEATURE_PPL \
|MD_FEATURE_MULTIPLE_PPLS \
|MD_FEATURE_RAID0_LAYOUT \
)
struct r5l_payload_header {