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| author | Martin Brandenburg <martin@omnibond.com> | 2017-04-25 15:38:06 -0400 |
|---|---|---|
| committer | Mike Marshall <hubcap@omnibond.com> | 2017-04-26 14:33:00 -0400 |
| commit | b7a57ccab891584d00ae03dce1176b2d4cbe08e7 (patch) | |
| tree | 066e124a463472b365a4933be82da9e5574d397c /fs/orangefs/devorangefs-req.c | |
| parent | 9d286b0d8207a70d7e0ffbd5be864ff7a62de05a (diff) | |
| download | blackbird-obmc-linux-b7a57ccab891584d00ae03dce1176b2d4cbe08e7.tar.gz blackbird-obmc-linux-b7a57ccab891584d00ae03dce1176b2d4cbe08e7.zip | |
orangefs: return from orangefs_devreq_read quickly if possible
It is not necessary to take the lock and search through the request list
if the list is empty.
Signed-off-by: Martin Brandenburg <martin@omnibond.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
Diffstat (limited to 'fs/orangefs/devorangefs-req.c')
| -rw-r--r-- | fs/orangefs/devorangefs-req.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/orangefs/devorangefs-req.c b/fs/orangefs/devorangefs-req.c index e1534c9bab16..c19f0787c9c6 100644 --- a/fs/orangefs/devorangefs-req.c +++ b/fs/orangefs/devorangefs-req.c @@ -180,6 +180,10 @@ static ssize_t orangefs_devreq_read(struct file *file, return -EINVAL; } + /* Check for an empty list before locking. */ + if (list_empty(&orangefs_request_list)) + return -EAGAIN; + restart: /* Get next op (if any) from top of list. */ spin_lock(&orangefs_request_list_lock); |
