From: Andy Adamson <andros@xxxxxxxxxx>
The nfs41 single slot clientid cache holds create session response which
has a maximum size of 88 bytes. Add a static buffer to struct nfs4_client
to cache the encoded create session response.
Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
---
fs/nfsd/nfs4state.c | 3 +++
include/linux/nfsd/state.h | 8 ++++++++
2 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index e82a518..27ad37f 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1283,6 +1283,9 @@ out_new:
status = nfserr_resource;
goto out;
}
+ /* Set the create session cache buffer */
+ new->cl_slot.sl_cache_entry.ce_datav.iov_base = new->cl_slot_buf;
+ new->cl_slot.sl_cache_entry.ce_datav.iov_len = CS_MAX_ENC_SZ;
copy_verf(new, &verf);
copy_cred(&new->cl_cred, &rqstp->rq_cred);
diff --git a/include/linux/nfsd/state.h b/include/linux/nfsd/state.h
index 14da8f6..87f3eaa 100644
--- a/include/linux/nfsd/state.h
+++ b/include/linux/nfsd/state.h
@@ -174,6 +174,13 @@ struct nfsd4_sessionid {
#define HEXDIR_LEN 33 /* hex version of 16 byte md5 of cl_name plus '\0' */
/*
+ * maximum encoded size of create session response
+ * 16 - sessionid, 8 - sequence # and flags,
+ * 32 - fore channel attrs, 32 - back channel attrs
+ */
+#define CS_MAX_ENC_SZ 88
+
+/*
* struct nfs4_client - one per client. Clientids live here.
* o Each nfs4_client is hashed by clientid.
*
@@ -206,6 +213,7 @@ struct nfs4_client {
/* for nfs41 */
struct list_head cl_sessions;
struct nfsd4_slot cl_slot; /* create_session slot */
+ char cl_slot_buf[CS_MAX_ENC_SZ]; /* slot buffer */
u32 cl_exchange_flags;
struct nfs4_sessionid cl_sessionid;
--
1.5.4.3
--
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