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btrfs: zoned: bail out if we can't read a reliable write pointer
commit 06e1e7f upstream. If we can't read a reliable write pointer from a sequential zone fail creating the block group with an I/O error. Also if the read write pointer is beyond the end of the respective zone, fail the creation of the block group on this zone with an I/O error. While this could also happen in real world scenarios with misbehaving drives, this issue addresses a problem uncovered by fstests' test case generic/475. CC: stable@vger.kernel.org # 5.12+ Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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