cifs: convert cifs_iovec_read to use async reads
Convert cifs_iovec_read to use async I/O. This also raises the limit on
the rsize for uncached reads. We first allocate a set of pages to hold
the replies, then issue the reads in parallel and then collect the
replies and copy the results into the iovec.
A possible future optimization would be to kmap and inline the iovec
buffers and read the data directly from the socket into that. That would
require some rather complex conversion of the iovec into a kvec however.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 63e91c7..eeb789d 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -465,6 +465,8 @@
/* asynchronous read support */
struct cifs_readdata {
struct kref refcount;
+ struct list_head list;
+ struct completion done;
struct cifsFileInfo *cfile;
struct address_space *mapping;
__u64 offset;