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authorTejun Heo <tj@kernel.org>2015-08-18 14:54:55 -0700
committerJens Axboe <axboe@fb.com>2015-08-18 15:49:15 -0700
commit9acee9c551f045d2c5b5261aa587331423fd7d92 (patch)
tree16f0ecafd4f842d6352dd85913283a262a8e56f0 /include/linux/kernfs.h
parent60292bcc1b240a6708aa531c8ece1da2a78d560a (diff)
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op-kernel-dev-9acee9c551f045d2c5b5261aa587331423fd7d92.tar.gz
kernfs: implement kernfs_path_len()
Add a function to determine the path length of a kernfs node. This for now will be used by writeback tracepoint updates. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/kernfs.h')
-rw-r--r--include/linux/kernfs.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
index 123be25..5d4e9c4 100644
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -266,6 +266,7 @@ static inline bool kernfs_ns_enabled(struct kernfs_node *kn)
}
int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen);
+size_t kernfs_path_len(struct kernfs_node *kn);
char * __must_check kernfs_path(struct kernfs_node *kn, char *buf,
size_t buflen);
void pr_cont_kernfs_name(struct kernfs_node *kn);
@@ -332,6 +333,9 @@ static inline bool kernfs_ns_enabled(struct kernfs_node *kn)
static inline int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen)
{ return -ENOSYS; }
+static inline size_t kernfs_path_len(struct kernfs_node *kn)
+{ return 0; }
+
static inline char * __must_check kernfs_path(struct kernfs_node *kn, char *buf,
size_t buflen)
{ return NULL; }
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