CIFS: Fix rsize usage for sync read
If a server changes maximum buffer size for read requests (rsize) on reconnect we can fail on repeating with a big size buffer on -EAGAIN error in cifs_read. Fix this by checking rsize all the time before repeating requests. Reviewed-by: NShirish Pargaonkar <spargaonkar@suse.com> Signed-off-by: NPavel Shilovsky <pshilovsky@samba.org> Signed-off-by: NSteve French <smfrench@gmail.com>
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