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authorDominique Martinet <dominique.martinet@cea.fr>2020-04-06 19:19:32 +0200
committerDominique Martinet <dominique.martinet@cea.fr>2020-04-08 17:05:28 +0200
commitc6f141412d24c8d8a9d98ef45303c0235829044b (patch)
tree569fb4893136ca5a7e1c94843bbd59989d9c9587
parent43657496e46672fe63bccc1fcfb5b68de6e1e2f4 (diff)
downloadlinux-c6f141412d24c8d8a9d98ef45303c0235829044b.tar.bz2
9p: document short read behaviour with O_NONBLOCK
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. Link: http://lkml.kernel.org/r/1586193572-1375-1-git-send-email-asmadeus@codewreck.org Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
-rw-r--r--Documentation/filesystems/9p.txt10
1 files changed, 10 insertions, 0 deletions
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
=========