[dm-devel] [PATCH] [RFC] switch DM tables to readonly automatically

[Hannes Reinecke]

Hi all,

this patch switches the device-mapper table to read-only
status automatically if one underlying device returns -EROFS.

Rationale:
Whenever a SCSI device is switched to read-only a table
reload from multipath-tools fails, without any indication
about the reason. And it's actually quite tricky to detect
the read-only status from userland. And quite pointless, too,
as the kernel already knows about it.

And we now can create tables for CD-ROMs, too, without
having to use the '-r' flag to dmsetup ...

Christophe, this might also fix your problem.

As usual, comments etc are welcome.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare at suse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)
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