diff options
| author | Mike Snitzer <snitzer@kernel.org> | 2025-11-11 09:59:31 -0500 |
|---|---|---|
| committer | Chuck Lever <chuck.lever@oracle.com> | 2025-12-01 09:57:10 -0500 |
| commit | 06c5c97293e3fca99ce15da157068edf45a7c6e4 (patch) | |
| tree | 1493d0a45a2cc0077914c18d91b9027c2537f43e /fs/nfsd/trace.h | |
| parent | e3e8e176ca4876e6212582022ad80835dddc9de4 (diff) | |
NFSD: Implement NFSD_IO_DIRECT for NFS WRITE
When NFSD_IO_DIRECT is selected via the
/sys/kernel/debug/nfsd/io_cache_write experimental tunable, split
incoming unaligned NFS WRITE requests into a prefix, middle and
suffix segment, as needed. The middle segment is now DIO-aligned and
the prefix and/or suffix are unaligned. Synchronous buffered IO is
used for the unaligned segments, and IOCB_DIRECT is used for the
middle DIO-aligned extent.
Although IOCB_DIRECT avoids the use of the page cache, by itself it
doesn't guarantee data durability. For UNSTABLE WRITE requests,
durability is obtained by a subsequent NFS COMMIT request.
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Co-developed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Diffstat (limited to 'fs/nfsd/trace.h')
| -rw-r--r-- | fs/nfsd/trace.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h index 85a1521ad757..5ae2a611e57f 100644 --- a/fs/nfsd/trace.h +++ b/fs/nfsd/trace.h @@ -469,6 +469,8 @@ DEFINE_NFSD_IO_EVENT(read_io_done); DEFINE_NFSD_IO_EVENT(read_done); DEFINE_NFSD_IO_EVENT(write_start); DEFINE_NFSD_IO_EVENT(write_opened); +DEFINE_NFSD_IO_EVENT(write_direct); +DEFINE_NFSD_IO_EVENT(write_vector); DEFINE_NFSD_IO_EVENT(write_io_done); DEFINE_NFSD_IO_EVENT(write_done); DEFINE_NFSD_IO_EVENT(commit_start); |