blktrace: use existing disk debugfs directory

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We may already have a directory to put the blktrace stuff in if

1. The disk uses blk-mq
2. CONFIG_BLK_DEBUG_FS is enabled
3. We are tracing the whole disk and not a partition

Instead of hardcoding this very specific case, let's use the new
debugfs_lookup(). If the directory exists, we use it, otherwise we
create one and clean it up later.

Fixes: 07e4fead45 ("blk-mq: create debugfs directory tree")
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

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Omar Sandoval 2017-01-31 14:53:22 -08:00 • committed by Jens Axboe

parent 62ebce16c0

commit 6ac93117ab

1 changed files with 8 additions and 5 deletions

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kernel/trace/blktrace.c

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