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44ac474def
Since raid6 recover tries all possible combinations of failed stripes, - when raid6 rebuild algorithm is used, i.e. raid6_datap_recov() and raid6_2data_recov(), it may change the in-memory content of failed stripes, if such a raid bio is cached, a later raid write rmw or recover can steal @stripe_pages from it instead of reading from disks, such that it carries the wrong content to do write rmw or recovery and ends up with corruption or recovery failures. - when raid5 rebuild algorithm is used, i.e. xor, raid bio can be cached because the only failed stripe which contains @rbio->bio_pages gets modified, others remain the same so that their in-memory content is consistent with their on-disk content. This adds a check to skip caching rbio if using raid6 recover. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.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.