From e1a9050c61bba5b51e21dbf8e80020c5c1d7c9ba Mon Sep 17 00:00:00 2001
From: sunwire <50745572+sunwire@users.noreply.github.com>
Date: Sat, 19 Oct 2019 20:26:10 +0100
Subject: Added direct_io option (#173)

---
 sshfs.rst | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'sshfs.rst')

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).
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