From: Dominique Martinet <[email protected]>
Regular files opened with O_NONBLOCK allow read to return after a single
round-trip with the server instead of trying to fill buffer.
Add a few lines in 9p documentation to describe that.
Signed-off-by: Dominique Martinet <[email protected]>
---
Documentation/filesystems/9p.txt | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/Documentation/filesystems/9p.txt b/Documentation/filesystems/9p.txt
index fec7144e817c..3fb780ffdf23 100644
--- a/Documentation/filesystems/9p.txt
+++ b/Documentation/filesystems/9p.txt
@@ -133,6 +133,16 @@ OPTIONS
cache tags for existing cache sessions can be listed at
/sys/fs/9p/caches. (applies only to cache=fscache)
+BEHAVIOR
+========
+
+This section aims at describing 9p 'quirks' that can be different
+from a local filesystem behaviors.
+
+ - Setting O_NONBLOCK on a file will make client reads return as early
+ as the server returns some data instead of trying to fill the read
+ buffer with the requested amount of bytes or end of file is reached.
+
RESOURCES
=========
--
2.26.0