Hi, Though the patch creates read-only device mappings, the READONLY status is not reflected on device mapper multipath devices. Example: open with O_RDWR flag succeeds for read-only mpath devices, and write fails with "Operation not permitted" error. Attached patch would fix this. Thanks, Vijay -----Original Message----- From: dm-devel-bounces@xxxxxxxxxx [mailto:dm-devel-bounces@xxxxxxxxxx] On Behalf Of Hannes Reinecke Sent: Friday, April 25, 2008 8:03 PM To: device-mapper development Subject: [PATCH] [RFC] switch DM tables to readonly automatically 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@xxxxxxx +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: Markus Rex, HRB 16746 (AG Nürnberg)
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