Awesome. 1 byte change to the source! I now have bcache0p1 in /dev. Not used it yet but so far it's looking good. :) -----Original Message----- From: linux-bcache-owner@xxxxxxxxxxxxxxx [mailto:linux-bcache-owner@xxxxxxxxxxxxxxx] On Behalf Of Kent Overstreet Sent: 02 November 2012 15:34 To: James Sefton Cc: linux-bcache@xxxxxxxxxxxxxxx Subject: Re: Partitions? On Fri, Nov 02, 2012 at 03:24:13AM +0000, James Sefton wrote: > Hi, > > I have got my /dev/bcache0 device showing up and attached the cache. > > I then used fdisk to add a single partition to it but it gave an error on exit: > > WARNING: Re-reading the partition table failed with error 22: Invalid argument. > The kernel still uses the old table. The new table will be used at the > next reboot or after you run partprobe(8) or kpartx(8) > > > I have had this before quite a bit and often have to run partprobe > after leaving fdisk for the partition table to be read and partitions populated in /dev. > > However, when running partprobe (or partprobe /dev/bcache0) I get the following: > > Error: Error informing the kernel about modifications to partition > /dev/bcache0p1 -- Invalid argument. This means Linux won't know about > any changes you made to /dev/bcache0p1 until you reboot -- so you > shouldn't mount it or use it in any way before rebooting. > Error: Failed to add partition 1 (Invalid argument) > > > I checked /dev and confirmed that bcache0p1 was not present. > > > What did I do wrong? Oh, that's nothing you did... the bcache code is just creating an unpartitionalable block device. I suppose there's no real reason for that... I _think_ all you'd need to change is one line, in drivers/md/bcache/super.c: if you search through the file, you'll find a call to alloc_disk(1) somewhere - change that to alloc_disk(16). Want to try that and let me know if it works? -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
