Messages in this thread | | | From | David Howells <> | Subject | Re: [PATCH 02/10] fs: don't allow splice read/write without explicit ops | Date | Tue, 27 Oct 2020 09:29:44 +0000 |
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Christoph Hellwig <hch@lst.de> wrote:
> default_file_splice_write is the last piece of generic code that uses > set_fs to make the uaccess routines operate on kernel pointers. It > implements a "fallback loop" for splicing from files that do not actually > provide a proper splice_read method. The usual file systems and other > high bandwith instances all provide a ->splice_read, so this just removes > support for various device drivers and procfs/debugfs files. If splice > support for any of those turns out to be important it can be added back > by switching them to the iter ops and using generic_file_splice_read.
Hmmm... this causes the copy_file_range() syscall to fail with EINVAL in some places where before it used to work.
For my part, it causes the generic/112 xfstest to fail with afs, but there may be other places.
Is this a regression we need to fix in the VFS core? Or is it something we need to fix in xfstests and assume userspace will fallback to doing it itself?
David
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