[PATCH v4 08/11] fs/9p: Add new mount modes

Eric Van Hensbergen
2023-02-18T00:45:23Z

Add some additional mount modes for cache management including
specifying directio as a mount option and an option for ignore
qid.version for determining whether or not a file is cacheable.

Signed-off-by: Eric Van Hensbergen <ericvh@kernel.org>
---
fs/9p/v9fs.c | 16 ++++++++++++++--
fs/9p/v9fs.h | 5 ++++-
2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index f8e952c013f9..43d3806150a9 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -38,7 +38,7 @@ enum {
/* String options */
Opt_uname, Opt_remotename, Opt_cache, Opt_cachetag,
/* Options that take no arguments */
- Opt_nodevmap, Opt_noxattr,
+ Opt_nodevmap, Opt_noxattr, Opt_directio, Opt_ignoreqv,
/* Access options */
Opt_access, Opt_posixacl,
/* Lock timeout option */
@@ -56,6 +56,8 @@ static const match_table_t tokens = {
{Opt_remotename, "aname=%s"},
{Opt_nodevmap, "nodevmap"},
{Opt_noxattr, "noxattr"},
+ {Opt_directio, "directio"},
+ {Opt_ignoreqv, "ignoreqv"},
{Opt_cache, "cache=%s"},
{Opt_cachetag, "cachetag=%s"},
{Opt_access, "access=%s"},
@@ -125,7 +127,7 @@ int v9fs_show_options(struct seq_file *m, struct dentry *root)
if (v9ses->nodev)
seq_puts(m, ",nodevmap");
if (v9ses->cache)
- seq_printf(m, ",%s", v9fs_cache_modes[v9ses->cache]);
+ seq_printf(m, ",cache=%s", v9fs_cache_modes[v9ses->cache]);
#ifdef CONFIG_9P_FSCACHE
if (v9ses->cachetag && v9ses->cache == CACHE_FSCACHE)
seq_printf(m, ",cachetag=%s", v9ses->cachetag);
@@ -147,6 +149,10 @@ int v9fs_show_options(struct seq_file *m, struct dentry *root)
break;
}

+ if (v9ses->flags & V9FS_IGNORE_QV)
+ seq_puts(m, ",ignoreqv");
+ if (v9ses->flags & V9FS_DIRECT_IO)
+ seq_puts(m, ",directio");
if (v9ses->flags & V9FS_POSIX_ACL)
seq_puts(m, ",posixacl");

@@ -276,6 +282,12 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
case Opt_noxattr:
v9ses->flags |= V9FS_NO_XATTR;
break;
+ case Opt_directio:
+ v9ses->flags |= V9FS_DIRECT_IO;
+ break;
+ case Opt_ignoreqv:
+ v9ses->flags |= V9FS_IGNORE_QV;
+ break;
case Opt_cachetag:
#ifdef CONFIG_9P_FSCACHE
kfree(v9ses->cachetag);
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index d90141d25d0d..48c7614c9333 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -37,7 +37,10 @@ enum p9_session_flags {
V9FS_ACCESS_USER = 0x08,
V9FS_ACCESS_CLIENT = 0x10,
V9FS_POSIX_ACL = 0x20,
- V9FS_NO_XATTR = 0x40
+ V9FS_NO_XATTR = 0x40,
+ V9FS_IGNORE_QV = 0x80,
+ V9FS_DIRECT_IO = 0x100,
+ V9FS_SYNC = 0x200
};

/* possible values of ->cache */
--
2.37.2