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authorAndy Adamson <andros@netapp.com>2009-04-03 08:28:28 +0300
committerJ. Bruce Fields <bfields@citi.umich.edu>2009-04-03 17:41:18 -0700
commitec6b5d7b5064fde27aee798b81107ea3a830de85 (patch)
treede1571b6773201268796fe5bf3db9bb0f8d23812 /include/linux/nfsd
parent14778a133e3be332be77d981552a79260a61ee17 (diff)
downloadop-kernel-dev-ec6b5d7b5064fde27aee798b81107ea3a830de85.zip
op-kernel-dev-ec6b5d7b5064fde27aee798b81107ea3a830de85.tar.gz
nfsd41: create_session operation
Implement the create_session operation confoming to http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion1-26 Look up the client id (generated by the server on exchange_id, given by the client on create_session). If neither a confirmed or unconfirmed client is found then the client id is stale If a confirmed cilent is found (i.e. we already received create_session for it) then compare the sequence id to determine if it's a replay or possibly a mis-ordered rpc. If the seqid is in order, update the confirmed client seqid and procedd with updating the session parameters. If an unconfirmed client_id is found then verify the creds and seqid. If both match move the client id to confirmed state and proceed with processing the create_session. Currently, we do not support persistent sessions, and RDMA. alloc_init_session generates a new sessionid and creates a session structure. NFSD_PAGES_PER_SLOT is used for the max response cached calculation, and for the counting of DRC pages using the hard limits set in struct srv_serv. A note on NFSD_PAGES_PER_SLOT: Other patches in this series allow for NFSD_PAGES_PER_SLOT + 1 pages to be cached in a DRC slot when the response size is less than NFSD_PAGES_PER_SLOT * PAGE_SIZE but xdr_buf pages are used. e.g. a READDIR operation will encode a small amount of data in the xdr_buf head, and then the READDIR in the xdr_buf pages. So, the hard limit calculation use of pages by a session is underestimated by the number of cached operations using the xdr_buf pages. Yet another patch caches no pages for the solo sequence operation, or any compound where cache_this is False. So the hard limit calculation use of pages by a session is overestimated by the number of these operations in the cache. TODO: improve resource pre-allocation and negotiate session parameters accordingly. Respect and possibly adjust backchannel attributes. Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: Dean Hildebrand <dhildeb@us.ibm.com> [nfsd41: remove headerpadsz from channel attributes] Our client and server only support a headerpadsz of 0. [nfsd41: use DRC limits in fore channel init] [nfsd41: do not change CREATE_SESSION back channel attrs] Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> [use sessionid_lock spin lock] [nfsd41: use bool inuse for slot state] Signed-off-by: Benny Halevy <bhalevy@panasas.com> [nfsd41 remove sl_session from alloc_init_session] Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> [simplify nfsd4_encode_create_session error handling] [nfsd41: fix comment style in init_forechannel_attrs] [nfsd41: allocate struct nfsd4_session and slot table in one piece] [nfsd41: no need to INIT_LIST_HEAD in alloc_init_session just prior to list_add] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Diffstat (limited to 'include/linux/nfsd')
-rw-r--r--include/linux/nfsd/state.h7
-rw-r--r--include/linux/nfsd/xdr4.h21
2 files changed, 26 insertions, 2 deletions
diff --git a/include/linux/nfsd/state.h b/include/linux/nfsd/state.h
index f1edb1d..692edf4 100644
--- a/include/linux/nfsd/state.h
+++ b/include/linux/nfsd/state.h
@@ -99,8 +99,12 @@ struct nfs4_callback {
struct rpc_clnt * cb_client;
};
+/* Maximum number of slots per session. 128 is useful for long haul TCP */
+#define NFSD_MAX_SLOTS_PER_SESSION 128
/* Maximum number of pages per slot cache entry */
#define NFSD_PAGES_PER_SLOT 1
+/* Maximum number of operations per session compound */
+#define NFSD_MAX_OPS_PER_COMPOUND 16
struct nfsd4_cache_entry {
__be32 ce_status;
@@ -129,7 +133,7 @@ struct nfsd4_session {
u32 se_fmaxresp_cached;
u32 se_fmaxops;
u32 se_fnumslots;
- struct nfsd4_slot *se_slots; /* forward channel slots */
+ struct nfsd4_slot se_slots[]; /* forward channel slots */
};
static inline void
@@ -188,6 +192,7 @@ struct nfs4_client {
struct list_head cl_sessions;
u32 cl_seqid; /* seqid for create_session */
u32 cl_exchange_flags;
+ struct nfs4_sessionid cl_sessionid;
};
/* struct nfs4_client_reset
diff --git a/include/linux/nfsd/xdr4.h b/include/linux/nfsd/xdr4.h
index 69cb467..9468829 100644
--- a/include/linux/nfsd/xdr4.h
+++ b/include/linux/nfsd/xdr4.h
@@ -359,8 +359,27 @@ struct nfsd4_exchange_id {
int spa_how;
};
+struct nfsd4_channel_attrs {
+ u32 headerpadsz;
+ u32 maxreq_sz;
+ u32 maxresp_sz;
+ u32 maxresp_cached;
+ u32 maxops;
+ u32 maxreqs;
+ u32 nr_rdma_attrs;
+ u32 rdma_attrs;
+};
+
struct nfsd4_create_session {
- int foo; /* stub */
+ clientid_t clientid;
+ struct nfs4_sessionid sessionid;
+ u32 seqid;
+ u32 flags;
+ struct nfsd4_channel_attrs fore_channel;
+ struct nfsd4_channel_attrs back_channel;
+ u32 callback_prog;
+ u32 uid;
+ u32 gid;
};
struct nfsd4_sequence {
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