blkid_get_topology() ignores devices which report 512
as their minimum & optimal IO size, but we should ignore
anything up to the physical block size; otherwise
4k devices will report a "stripe size" of 4k, and warn
if anything larger is specified:
# modprobe scsi_debug physblk_exp=3 num_parts=2 dev_size_mb=128
# mdadm --create /dev/md1 --level=0 --raid-devices=2 -c 4 /dev/sdb1 /dev/sdb2
# mkfs.xfs -f -d su=16k,sw=2 /dev/md1
mkfs.xfs: Specified data stripe unit 32 is not the same as the volume stripe unit 8
mkfs.xfs: Specified data stripe width 64 is not the same as the volume stripe width 16
...
but a stripe unit of 4k is pretty nonsensical. And that's even chosen by
default in this case, which is maybe even worse?
# mkfs.xfs -f /dev/md1
meta-data=/dev/md1 isize=256 agcount=2, agsize=8125 blks
= sectsz=512 attr=2
data = bsize=4096 blocks=16249, imaxpct=25
= sunit=1 swidth=8 blks
...
We can rearrange things a bit, get the physical block size first,
and then ignore reported minimum/optimal sizes which is no larger
than that.
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---
diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
index 577880b..386d1d6 100644
--- a/mkfs/xfs_mkfs.c
+++ b/mkfs/xfs_mkfs.c
@@ -396,25 +396,25 @@ static void blkid_get_topology(
if (!tp)
goto out_free_probe;
+ val = blkid_topology_get_logical_sector_size(tp);
+ *lsectorsize = val;
+ val = blkid_topology_get_physical_sector_size(tp);
+ *psectorsize = val;
+
/*
* Blkid reports the information in terms of bytes, but we want it in
* terms of 512 bytes blocks (just to convert it to bytes later..)
*
- * If the reported values are just the normal 512 byte block size
- * do not bother to report anything. It will just causes warnings
- * if people specifier larger stripe units or widths manually.
+ * If the reported values are the same as the physical block size
+ * do not bother to report anything. It will just cause warnings
+ * if people specify larger stripe units or widths manually.
*/
- val = blkid_topology_get_minimum_io_size(tp) >> 9;
- if (val > 1)
- *sunit = val;
- val = blkid_topology_get_optimal_io_size(tp) >> 9;
- if (val > 1)
- *swidth = val;
-
- val = blkid_topology_get_logical_sector_size(tp);
- *lsectorsize = val;
- val = blkid_topology_get_physical_sector_size(tp);
- *psectorsize = val;
+ val = blkid_topology_get_minimum_io_size(tp);
+ if (val > *psectorsize)
+ *sunit = val >> 9;
+ val = blkid_topology_get_optimal_io_size(tp);
+ if (val > *psectorsize)
+ *swidth = val >> 9;
if (blkid_topology_get_alignment_offset(tp) != 0) {
fprintf(stderr,
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