[PATCH v5 18/19] NFSD: Add a "default" block size

[cel@kernel.org]

From: Chuck Lever <chuck.lever@oracle.com>

We'd like to increase the maximum r/wsize that NFSD can support,
but without introducing possible regressions. So let's add a
default setting of 1MB. A subsequent patch will raise the
maximum value but leave the default alone.

No behavior change is expected.

Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/nfsd/nfsd.h   | 9 +++++++--
 fs/nfsd/nfssvc.c | 2 +-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
index 6428a431d765..1bfd0b4e9af7 100644
--- a/fs/nfsd/nfsd.h
+++ b/fs/nfsd/nfsd.h
@@ -44,9 +44,14 @@ bool nfsd_support_version(int vers);
 #include "stats.h"
 
 /*
- * Maximum blocksizes supported by daemon under various circumstances.
+ * Default and maximum payload size (NFS READ or WRITE), in bytes.
+ * The default is historical, and the maximum is an implementation
+ * limit.
  */
-#define NFSSVC_MAXBLKSIZE       RPCSVC_MAXPAYLOAD
+enum {
+	NFSSVC_DEFBLKSIZE       = 1 * 1024 * 1024,
+	NFSSVC_MAXBLKSIZE       = RPCSVC_MAXPAYLOAD,
+};
 
 struct readdir_cd {
 	__be32			err;	/* 0, nfserr, or nfserr_eof */
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 8ed143ef8b41..82b0111ac469 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -582,7 +582,7 @@ static int nfsd_get_default_max_blksize(void)
 	 */
 	target >>= 12;
 
-	ret = NFSSVC_MAXBLKSIZE;
+	ret = NFSSVC_DEFBLKSIZE;
 	while (ret > target && ret >= 8*1024*2)
 		ret /= 2;
 	return ret;
-- 
2.49.0