On Thu, May 18, 2017 at 05:11:35PM -0700, Liu Bo wrote: > On Wed, May 17, 2017 at 02:41:21AM +0100, [email protected] wrote: > > From: Filipe Manana <[email protected]> > > > > We correctly build an image from a multiple devices filesystem but when > > restoring the image into a single device we were missing updating the > > number of devices in the superblock to the value 1 (we already took care > > of setting the number of stripes to 1 for each chunk item and setting > > the device id for each chunk item to match the device id from the super > > block). > > > > This missing update of the number of devices makes it impossible to mount > > the restored filesystem on recent kernels, more specifically since the > > linux kernel commit 99e3ecfcb9f4ca35192d20a5bea158b81f600062 > > ("Btrfs: add more validation checks for superblock"), that produce the > > following message in the dmesg/syslog: > > > > [21097.542047] BTRFS error (device sdi): super_num_devices 2 mismatch with > > num_devices 1 found here > > [21097.543972] BTRFS error (device sdi): failed to read chunk tree: -22 > > [21097.720360] BTRFS error (device sdi): open_ctree failed > > > > So fix this by updating the number of devices to 1 in the superblock. > > > > Signed-off-by: Filipe Manana <[email protected]> > > Looks good. > > Reviewed-by: Liu Bo <[email protected]>
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