diff options
| author | Chuck Lever <chuck.lever@oracle.com> | 2025-03-08 15:14:38 -0500 |
|---|---|---|
| committer | Chuck Lever <chuck.lever@oracle.com> | 2025-05-11 19:48:24 -0400 |
| commit | 1218149037ee80f88aee4fa4c34b1de23df77fb1 (patch) | |
| tree | 9168fb908e988b37608fa4e2cfcd7bfc73be8fcf /fs/nfsd/vfs.c | |
| parent | 9fe5ea760e64f04412dbed51645a0dac7220d40a (diff) | |
NFSD: Add experimental setting to disable the use of splice read
NFSD currently has two separate code paths for handling read
requests. One uses page splicing; the other is a traditional read
based on an iov iterator.
Because most Linux file systems support splice read, the latter
does not get nearly the same test experience as splice reads.
To force the use of vectored reads for testing and benchmarking,
introduce the ability to disable splice reads for all NFS READ
operations.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Diffstat (limited to 'fs/nfsd/vfs.c')
| -rw-r--r-- | fs/nfsd/vfs.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 9abdc4b75813..02827b0f0492 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -47,6 +47,8 @@ #define NFSDDBG_FACILITY NFSDDBG_FILEOP +bool nfsd_disable_splice_read __read_mostly; + /** * nfserrno - Map Linux errnos to NFS errnos * @errno: POSIX(-ish) error code to be mapped @@ -1236,6 +1238,8 @@ out_nfserr: */ bool nfsd_read_splice_ok(struct svc_rqst *rqstp) { + if (nfsd_disable_splice_read) + return false; switch (svc_auth_flavor(rqstp)) { case RPC_AUTH_GSS_KRB5I: case RPC_AUTH_GSS_KRB5P: |