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author | Daniel Wagner <daniel.wagner@bmw-carit.de> | 2016-09-22 13:54:28 +0200 |
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committer | Anna Schumaker <Anna.Schumaker@Netapp.com> | 2016-09-23 09:14:16 -0400 |
commit | 024de8f1ade4c513f74172993572e9694ede81a1 (patch) | |
tree | c88c96d2de810e2c278484835556372582ac54c8 /fs/nfs/direct.c | |
parent | a6cebd41b83a271d5b1dcaa5b4676df899f8d4ea (diff) | |
download | linux-stable-024de8f1ade4c513f74172993572e9694ede81a1.tar.gz linux-stable-024de8f1ade4c513f74172993572e9694ede81a1.tar.bz2 linux-stable-024de8f1ade4c513f74172993572e9694ede81a1.zip |
NFS: direct: use complete() instead of complete_all()
There is only one waiter for the completion, therefore there
is no need to use complete_all(). Let's make that clear by
using complete() instead of complete_all().
nfs_file_direct_write() or nfs_file_direct_read() allocated a request
object via nfs_direct_req_alloc(), which initializes the
completion. The request object then is freed later in the exit path.
Between the initialization and the release either
nfs_direct_write_schedule_iovec() resp
nfs_direct_read_schedule_iovec() are called which will asynchronously
process the request. The calling function waits via nfs_direct_wait()
till the async work has been done. Thus there is only one waiter on
the completion.
nfs_direct_pgio_init() and nfs_direct_read_completion() are passed via
function pointers to nfs pageio. The first function does a ref
counting (get_dreq() and put_dreq()) which ensures that
nfs_direct_read_completion() and nfs_direct_read_schedule_iovec() only
call the completion path once.
The usage pattern of the completion is:
waiter context waker context
nfs_file_direct_write()
dreq = nfs_direct_req_alloc()
init_completion()
nfs_direct_write_schedule_iovec()
nfs_direct_wait()
wait_for_completion_killable()
nfs_direct_write_schedule_work()
nfs_direct_complete()
complete()
nfs_file_direct_read()
dreq = nfs_direct_req_all()
init_completion()
nfs_direct_read_schedule_iovec()
nfs_direct_wait()
wait_for_completion_killable()
nfs_direct_read_schedule_iovec()
nfs_direct_complete()
complete()
nfs_direct_read_completion()
nfs_direct_complete()
complete()
Signed-off-by: Daniel Wagner <daniel.wagner@bmw-carit.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs/direct.c')
-rw-r--r-- | fs/nfs/direct.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 72b7d13ee3c6..bd81bcf3ffcf 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -387,7 +387,7 @@ static void nfs_direct_complete(struct nfs_direct_req *dreq) dreq->iocb->ki_complete(dreq->iocb, res, 0); } - complete_all(&dreq->completion); + complete(&dreq->completion); nfs_direct_req_release(dreq); } |