[PATCH] fs/9p: Add new options to Documentation

Eric Van Hensbergen
2023-03-27T03:06:01Z

Need to update the documentation for new mount flags
and cache modes.

Signed-off-by: Eric Van Hensbergen <ericvh@kernel.org>
---
Documentation/filesystems/9p.rst | 29 ++++++++++++++++-------------
1 file changed, 16 insertions(+), 13 deletions(-)

diff --git a/Documentation/filesystems/9p.rst b/Documentation/filesystems/9p.rst
index 0e800b8f73cc..6d257854a02a 100644
--- a/Documentation/filesystems/9p.rst
+++ b/Documentation/filesystems/9p.rst
@@ -78,19 +78,18 @@ Options
offering several exported file systems.

cache=mode specifies a caching policy. By default, no caches are used.
-
- none
- default no cache policy, metadata and data
- alike are synchronous.
- loose
- no attempts are made at consistency,
- intended for exclusive, read-only mounts
- fscache
- use FS-Cache for a persistent, read-only
- cache backend.
- mmap
- minimal cache that is only used for read-write
- mmap. Northing else is cached, like cache=none
+ Modes are progressive and inclusive. For example, specifying fscache
+ will use loose caches, writeback, and readahead. Due to their
+ inclusive nature, only one cache mode can be specified per mount.
+
+ ========= =============================================
+ none no cache of file or metadata
+ readahead readahead caching of files
+ writeback delayed writeback of files
+ mmap support mmap operations read/write with cache
+ loose meta-data and file cache with no coherency
+ fscache use FS-Cache for a persistent cache backend
+ ========= =============================================

debug=n specifies debug level. The debug level is a bitmask.

@@ -137,6 +136,10 @@ Options
This can be used to share devices/named pipes/sockets between
hosts. This functionality will be expanded in later versions.

+ directio bypass page cache on all read/write operations
+
+ ignoreqv ignore qid.version==0 as a marker to ignore cache
+
noxattr do not offer xattr functions on this mount.

access there are four access modes.
--
2.39.2