Omar Sandoval f31b9c8fe7 UPSTREAM: debugfs: add debugfs_lookup() ...

We don't always have easy access to the dentry of a file or directory we
created in debugfs. Add a helper which allows us to get a dentry we
previously created.

The motivation for this change is a problem with blktrace and the blk-mq
debugfs entries introduced in 07e4fead45 ("blk-mq: create debugfs
directory tree"). Namely, in some cases, the directory that blktrace
needs to create may already exist, but in other cases, it may not. We
_could_ rely on a bunch of implied knowledge to decide whether to create
the directory or not, but it's much cleaner on our end to just look it
up.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
(cherry picked from commit a7c5437b0b)

Change-Id: I77b6f2c7df32f904099d23771a53065315cfdc12

2017-07-26 15:07:32 +08:00

..

file.c

debugfs: Add debugfs_create_ulong()

2015-10-18 10:14:39 -07:00

inode.c

UPSTREAM: debugfs: add debugfs_lookup()

2017-07-26 15:07:32 +08:00

Makefile

Linux-2.6.12-rc2

2005-04-16 15:20:36 -07:00