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b73c67c2cb
When copyying blocks to host-managed zoned block devices, writes must be sequential. However, dm_kcopyd_copy() does not guarantee this as writes are issued in the completion order of reads, and reads may complete out of order despite being issued sequentially. Fix this by introducing the DM_KCOPYD_WRITE_SEQ feature flag. This can be specified when calling dm_kcopyd_copy() and should be set automatically if one of the destinations is a host-managed zoned block device. For a split job, the master job maintains the write position at which writes must be issued. This is checked with the pop() function which is modified to not return any write I/O sub job that is not at the correct write position. When DM_KCOPYD_WRITE_SEQ is specified for a job, errors cannot be ignored and the flag DM_KCOPYD_IGNORE_ERROR is ignored, even if specified by the user. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.