The filesystems already implement REQ_PEEK, but do not fully use the new filesystem cache code yet. (Because it isn't committed yet..) REQ_PEEK should be disabled for them until they do. This indicates to VFS that they are not annotating their cache blocks (in VM) with inode number/offset info, and therefore mmap() shouldn't succeed on any of their files. (Most importantly exec() won't fallback elegantly otherwise.) Change-Id: Ic57ee422864b4bbc031eadba32973270907b02fd
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