Added direct_io option (#173)

1 files changed, 11 insertions, 0 deletions

diff --git a/sshfs.rst b/sshfs.rst
index 1446555..41b4787 100644
--- a/sshfs.rst
+++ b/sshfs.rst
@@ -202,6 +202,17 @@ Options
    sets the interval for forced cleaning of the directory cache
    when full.
 
+-o direct_io
+   This option disables the use of page cache (file content cache) in 
+   the kernel for this filesystem.
+   This has several affects:
+   1. Each read() or write() system call will initiate one or more read or
+      write operations, data will not be cached in the kernel.
+   2. The return value of the read() and write() system calls will correspond 
+      to the return values of the read and write operations. This is useful 
+      for example if the file size is not known in advance (before reading it).
+      e.g. /proc filesystem 
+
 In addition, SSHFS accepts several options common to all FUSE file
 systems. These are described in the `mount.fuse` manpage (look
 for "general", "libfuse specific", and "high-level API" options).