On Fri, 10 Aug 2018 22:48:43 +0800, "Larry" said: > Does it intend to remove existent pages in block device's page cache > if some new page cache of a vfs file was created whose block number > range has overlaps with its block device page cache?
That's a situation you *really* hope doesn't arise. Consider if you have (for example) an ext4 filesystem on /dev/sda4 mounted on /foobar. For there to be page cache for the ext4 filesystem and also page cache for the block device, that means that something is writing to a file on /foobar while something else is writing directly to /dev/sda4. That's a really good way to corrupt the filesystem (and is why it's a Really Bad Idea to fsck a mounted filesystem). And no, merely trimming cache pages that overlap doesn't even come *close* to fixing the problem...
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