After and include kernel v5.4, it adds one feature bit MD_FEATURE_RAID0_LAYOUT.
It must need to specify a layout for raid0 with more than one zone. But for
raid0 with one zone, in fact it also has a defalut layout.
Now for raid0 with one zone, *unknown* layout can be seen when running mdadm -D
command. It's the reason that mdadm doesn't set MD_FEATURE_RAID0_LAYOUT for
raid0 with one zone. Then in kernel space, super_1_validate sets mddev->layout
to -1 because of no MD_FEATURE_RAID0_LAYOUT. In fact, in raid0 io path, it
uses the default layout. Set raid0_need_layout to true if kernel_version<=v5.4.
Fixes: 329dfc28debb ('Create: add support for RAID0 layouts.')
Signed-off-by: Xiao Ni <xni@xxxxxxxxxx>
---
super1.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
diff --git a/super1.c b/super1.c
index 856b02082662..1da71b98d29e 100644
--- a/super1.c
+++ b/super1.c
@@ -1967,6 +1967,14 @@ fail_to_write:
return 1;
}
+static bool has_raid0_layout(struct mdp_superblock_1 *sb)
+{
+ if (sb->level == 0 && sb->layout != 0)
+ return true;
+ else
+ return false;
+}
+
static int write_init_super1(struct supertype *st)
{
struct mdp_superblock_1 *sb = st->sb;
@@ -1978,12 +1986,17 @@ static int write_init_super1(struct supertype *st)
unsigned long long sb_offset;
unsigned long long data_offset;
long bm_offset;
- int raid0_need_layout = 0;
+ bool raid0_need_layout = false;
+
+ /* Since linux kernel v5.4, raid0 always has a layout */
+ if (has_raid0_layout(sb) && get_linux_version() >= 5004000)
+ raid0_need_layout = true;
for (di = st->info; di; di = di->next) {
if (di->disk.state & (1 << MD_DISK_JOURNAL))
sb->feature_map |= __cpu_to_le32(MD_FEATURE_JOURNAL);
- if (sb->level == 0 && sb->layout != 0) {
+ if (has_raid0_layout(sb) && !raid0_need_layout) {
+
struct devinfo *di2 = st->info;
unsigned long long s1, s2;
s1 = di->dev_size;
@@ -1995,7 +2008,7 @@ static int write_init_super1(struct supertype *st)
s2 -= di2->data_offset;
s2 /= __le32_to_cpu(sb->chunksize);
if (s1 != s2)
- raid0_need_layout = 1;
+ raid0_need_layout = true;
}
}
--
2.32.0 (Apple Git-132)
