9p: document short read behaviour with O_NONBLOCK (c6f14141) · Commits · 戴 / test

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:

Documentation/filesystems/9p.txt

+10 −0

Original line number	Diff line number	Diff line
		@@ -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
		=========