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authorAbhishek Kulkarni <adkulkar@umail.iu.edu>2009-09-23 13:00:27 -0500
committerEric Van Hensbergen <ericvh@strongmad.austin.ibm.com>2009-09-23 13:03:46 -0500
commit60e78d2c993e58d890596d951fff77d5965adcd6 (patch)
tree3d53ed7254c613ef8d8de36fdceda25bc493f4f7 /fs/9p/v9fs.h
parent637d020a02cd734bf27acfc56c6d942cddd9eb80 (diff)
downloadvexpress-lsk-60e78d2c993e58d890596d951fff77d5965adcd6.tar.gz
9p: Add fscache support to 9p
This patch adds a persistent, read-only caching facility for 9p clients using the FS-Cache caching backend. When the fscache facility is enabled, each inode is associated with a corresponding vcookie which is an index into the FS-Cache indexing tree. The FS-Cache indexing tree is indexed at 3 levels: - session object associated with each mount. - inode/vcookie - actual data (pages) A cache tag is chosen randomly for each session. These tags can be read off /sys/fs/9p/caches and can be passed as a mount-time parameter to re-attach to the specified caching session. Signed-off-by: Abhishek Kulkarni <adkulkar@umail.iu.edu> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'fs/9p/v9fs.h')
-rw-r--r--fs/9p/v9fs.h13
1 files changed, 9 insertions, 4 deletions
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index 38762bf102a..019f4ccb70c 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -51,6 +51,7 @@ enum p9_session_flags {
enum p9_cache_modes {
CACHE_NONE,
CACHE_LOOSE,
+ CACHE_FSCACHE,
};
/**
@@ -60,6 +61,8 @@ enum p9_cache_modes {
* @debug: debug level
* @afid: authentication handle
* @cache: cache mode of type &p9_cache_modes
+ * @cachetag: the tag of the cache associated with this session
+ * @fscache: session cookie associated with FS-Cache
* @options: copy of options string given by user
* @uname: string user name to mount hierarchy as
* @aname: mount specifier for remote hierarchy
@@ -68,7 +71,7 @@ enum p9_cache_modes {
* @dfltgid: default numeric groupid to mount hierarchy as
* @uid: if %V9FS_ACCESS_SINGLE, the numeric uid which mounted the hierarchy
* @clnt: reference to 9P network client instantiated for this session
- * @debugfs_dir: reference to debugfs_dir which can be used for add'l debug
+ * @slist: reference to list of registered 9p sessions
*
* This structure holds state for each session instance established during
* a sys_mount() .
@@ -84,6 +87,10 @@ struct v9fs_session_info {
unsigned short debug;
unsigned int afid;
unsigned int cache;
+#ifdef CONFIG_9P_FSCACHE
+ char *cachetag;
+ struct fscache_cookie *fscache;
+#endif
char *uname; /* user name to mount as */
char *aname; /* name of remote hierarchy being mounted */
@@ -92,11 +99,9 @@ struct v9fs_session_info {
unsigned int dfltgid; /* default gid for legacy support */
u32 uid; /* if ACCESS_SINGLE, the uid that has access */
struct p9_client *clnt; /* 9p client */
- struct dentry *debugfs_dir;
+ struct list_head slist; /* list of sessions registered with v9fs */
};
-extern struct dentry *v9fs_debugfs_root;
-
struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *,
char *);
void v9fs_session_close(struct v9fs_session_info *v9ses);