diff options
| author | Chuck Lever <chuck.lever@oracle.com> | 2025-04-28 15:36:50 -0400 |
|---|---|---|
| committer | Chuck Lever <chuck.lever@oracle.com> | 2025-05-15 16:16:21 -0400 |
| commit | eff042ddf4b9587fa7394d502b93e06ec6015177 (patch) | |
| tree | 081ef40f5c2a56eea3bcbd764c56948b46220a2a | |
| parent | 59243315890578a040a2d50ae9e001a2ef2fcb62 (diff) | |
sunrpc: Add a helper to derive maxpages from sv_max_mesg
This page count is to be used to allocate various arrays of pages
and bio_vecs, replacing the fixed RPCSVC_MAXPAGES value.
The documenting comment is somewhat stale -- of course NFSv4
COMPOUND procedures may have multiple payloads.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
| -rw-r--r-- | include/linux/sunrpc/svc.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h index 74658cca0f38..749f8e53e8a6 100644 --- a/include/linux/sunrpc/svc.h +++ b/include/linux/sunrpc/svc.h @@ -159,6 +159,23 @@ extern u32 svc_max_payload(const struct svc_rqst *rqstp); #define RPCSVC_MAXPAGES ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE \ + 2 + 1) +/** + * svc_serv_maxpages - maximum count of pages needed for one RPC message + * @serv: RPC service context + * + * Returns a count of pages or vectors that can hold the maximum + * size RPC message for @serv. + * + * Each request/reply pair can have at most one "payload", plus two + * pages, one for the request, and one for the reply. + * nfsd_splice_actor() might need an extra page when a READ payload + * is not page-aligned. + */ +static inline unsigned long svc_serv_maxpages(const struct svc_serv *serv) +{ + return DIV_ROUND_UP(serv->sv_max_mesg, PAGE_SIZE) + 2 + 1; +} + /* * The context of a single thread, including the request currently being * processed. |