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| author | Dominique Martinet <dominique.martinet@cea.fr> | 2020-04-06 19:19:32 +0200 |
|---|---|---|
| committer | Dominique Martinet <dominique.martinet@cea.fr> | 2020-04-08 17:05:28 +0200 |
| commit | c6f141412d24c8d8a9d98ef45303c0235829044b (patch) | |
| tree | 569fb4893136ca5a7e1c94843bbd59989d9c9587 | |
| parent | 43657496e46672fe63bccc1fcfb5b68de6e1e2f4 (diff) | |
| download | kvmarm-c6f141412d24c8d8a9d98ef45303c0235829044b.tar.gz | |
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.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/filesystems/9p.txt b/Documentation/filesystems/9p.txt index fec7144e817c41..3fb780ffdf23a0 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 ========= |