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configfs: implement binary attributes
ConfigFS lacked binary attributes up until now. This patch introduces support for binary attributes in a somewhat similar manner of sysfs binary attributes albeit with changes that fit the configfs usage model. Problems that configfs binary attributes fix are everything that requires a binary blob as part of the configuration of a resource, such as bitstream loading for FPGAs, DTBs for dynamically created devices etc. Look at Documentation/filesystems/configfs/configfs.txt for internals and howto use them. This patch is against linux-next as of today that contains Christoph's configfs rework. Signed-off-by: Pantelis Antoniou <firstname.lastname@example.org> [hch: folded a fix from Geert Uytterhoeven <email@example.com>] [hch: a few tiny updates based on review feedback] Signed-off-by: Christoph Hellwig <firstname.lastname@example.org>
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