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A target map method requesting the requeue of a bio with DM_MAPIO_REQUEUE or completing it with DM_ENDIO_REQUEUE can cause unaligned write errors if the bio is a write operation targeting a sequential zone. If a zoned target request such a requeue, warn about it and kill the IO. The function dm_is_zone_write() is introduced to detect write operations to zoned targets. This change does not affect the target drivers supporting zoned devices and exposing a zoned device, namely dm-crypt, dm-linear and dm-flakey as none of these targets ever request a requeue. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.