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Provide a splice_read wrapper for Ceph. This does the inode shutdown check
before proceeding and jumps to copy_splice_read() if the file has inline
data or is a synchronous file.
We try and get FILE_RD and either FILE_CACHE and/or FILE_LAZYIO caps and
hold them across filemap_splice_read(). If we fail to get FILE_CACHE or
FILE_LAZYIO capabilities, we use copy_splice_read() instead.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
cc: Christoph Hellwig <hch@lst.de>
cc: Al Viro <viro@zeniv.linux.org.uk>
cc: Jens Axboe <axboe@kernel.dk>
cc: Ilya Dryomov <idryomov@gmail.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: ceph-devel@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
cc: linux-block@vger.kernel.org
cc: linux-mm@kvack.org
Link: https://lore.kernel.org/r/20230522135018.2742245-17-dhowells@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
ccfdf7cbb5