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path: root/fs/nfsd/nfs4state.c
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Diffstat (limited to 'fs/nfsd/nfs4state.c')
-rw-r--r--fs/nfsd/nfs4state.c211
1 files changed, 60 insertions, 151 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index c9a45f49019..46e9ac52687 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -514,12 +514,23 @@ static int init_forechannel_attrs(struct svc_rqst *rqstp,
return status;
}
+static void
+free_session_slots(struct nfsd4_session *ses)
+{
+ int i;
+
+ for (i = 0; i < ses->se_fchannel.maxreqs; i++)
+ kfree(ses->se_slots[i]);
+}
+
static int
alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp,
struct nfsd4_create_session *cses)
{
struct nfsd4_session *new, tmp;
- int idx, status = nfserr_serverfault, slotsize;
+ struct nfsd4_slot *sp;
+ int idx, slotsize, cachesize, i;
+ int status;
memset(&tmp, 0, sizeof(tmp));
@@ -530,14 +541,27 @@ alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp,
if (status)
goto out;
- /* allocate struct nfsd4_session and slot table in one piece */
- slotsize = tmp.se_fchannel.maxreqs * sizeof(struct nfsd4_slot);
+ BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot)
+ + sizeof(struct nfsd4_session) > PAGE_SIZE);
+
+ status = nfserr_serverfault;
+ /* allocate struct nfsd4_session and slot table pointers in one piece */
+ slotsize = tmp.se_fchannel.maxreqs * sizeof(struct nfsd4_slot *);
new = kzalloc(sizeof(*new) + slotsize, GFP_KERNEL);
if (!new)
goto out;
memcpy(new, &tmp, sizeof(*new));
+ /* allocate each struct nfsd4_slot and data cache in one piece */
+ cachesize = new->se_fchannel.maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
+ for (i = 0; i < new->se_fchannel.maxreqs; i++) {
+ sp = kzalloc(sizeof(*sp) + cachesize, GFP_KERNEL);
+ if (!sp)
+ goto out_free;
+ new->se_slots[i] = sp;
+ }
+
new->se_client = clp;
gen_sessionid(new);
idx = hash_sessionid(&new->se_sessionid);
@@ -554,6 +578,10 @@ alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp,
status = nfs_ok;
out:
return status;
+out_free:
+ free_session_slots(new);
+ kfree(new);
+ goto out;
}
/* caller must hold sessionid_lock */
@@ -596,22 +624,16 @@ release_session(struct nfsd4_session *ses)
nfsd4_put_session(ses);
}
-static void nfsd4_release_respages(struct page **respages, short resused);
-
void
free_session(struct kref *kref)
{
struct nfsd4_session *ses;
- int i;
ses = container_of(kref, struct nfsd4_session, se_ref);
- for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
- struct nfsd4_cache_entry *e = &ses->se_slots[i].sl_cache_entry;
- nfsd4_release_respages(e->ce_respages, e->ce_resused);
- }
spin_lock(&nfsd_drc_lock);
nfsd_drc_mem_used -= ses->se_fchannel.maxreqs * NFSD_SLOT_CACHE_SIZE;
spin_unlock(&nfsd_drc_lock);
+ free_session_slots(ses);
kfree(ses);
}
@@ -968,116 +990,31 @@ out_err:
return;
}
-void
-nfsd4_set_statp(struct svc_rqst *rqstp, __be32 *statp)
-{
- struct nfsd4_compoundres *resp = rqstp->rq_resp;
-
- resp->cstate.statp = statp;
-}
-
-/*
- * Dereference the result pages.
- */
-static void
-nfsd4_release_respages(struct page **respages, short resused)
-{
- int i;
-
- dprintk("--> %s\n", __func__);
- for (i = 0; i < resused; i++) {
- if (!respages[i])
- continue;
- put_page(respages[i]);
- respages[i] = NULL;
- }
-}
-
-static void
-nfsd4_copy_pages(struct page **topages, struct page **frompages, short count)
-{
- int i;
-
- for (i = 0; i < count; i++) {
- topages[i] = frompages[i];
- if (!topages[i])
- continue;
- get_page(topages[i]);
- }
-}
-
/*
- * Cache the reply pages up to NFSD_PAGES_PER_SLOT + 1, clearing the previous
- * pages. We add a page to NFSD_PAGES_PER_SLOT for the case where the total
- * length of the XDR response is less than se_fmaxresp_cached
- * (NFSD_PAGES_PER_SLOT * PAGE_SIZE) but the xdr_buf pages is used for a
- * of the reply (e.g. readdir).
- *
- * Store the base and length of the rq_req.head[0] page
- * of the NFSv4.1 data, just past the rpc header.
+ * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
*/
void
nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
{
- struct nfsd4_cache_entry *entry = &resp->cstate.slot->sl_cache_entry;
- struct svc_rqst *rqstp = resp->rqstp;
- struct kvec *resv = &rqstp->rq_res.head[0];
-
- dprintk("--> %s entry %p\n", __func__, entry);
+ struct nfsd4_slot *slot = resp->cstate.slot;
+ unsigned int base;
- nfsd4_release_respages(entry->ce_respages, entry->ce_resused);
- entry->ce_opcnt = resp->opcnt;
- entry->ce_status = resp->cstate.status;
+ dprintk("--> %s slot %p\n", __func__, slot);
- /*
- * Don't need a page to cache just the sequence operation - the slot
- * does this for us!
- */
+ slot->sl_opcnt = resp->opcnt;
+ slot->sl_status = resp->cstate.status;
if (nfsd4_not_cached(resp)) {
- entry->ce_resused = 0;
- entry->ce_rpchdrlen = 0;
- dprintk("%s Just cache SEQUENCE. ce_cachethis %d\n", __func__,
- resp->cstate.slot->sl_cache_entry.ce_cachethis);
+ slot->sl_datalen = 0;
return;
}
- entry->ce_resused = rqstp->rq_resused;
- if (entry->ce_resused > NFSD_PAGES_PER_SLOT + 1)
- entry->ce_resused = NFSD_PAGES_PER_SLOT + 1;
- nfsd4_copy_pages(entry->ce_respages, rqstp->rq_respages,
- entry->ce_resused);
- entry->ce_datav.iov_base = resp->cstate.statp;
- entry->ce_datav.iov_len = resv->iov_len - ((char *)resp->cstate.statp -
- (char *)page_address(rqstp->rq_respages[0]));
- /* Current request rpc header length*/
- entry->ce_rpchdrlen = (char *)resp->cstate.statp -
- (char *)page_address(rqstp->rq_respages[0]);
-}
-
-/*
- * We keep the rpc header, but take the nfs reply from the replycache.
- */
-static int
-nfsd41_copy_replay_data(struct nfsd4_compoundres *resp,
- struct nfsd4_cache_entry *entry)
-{
- struct svc_rqst *rqstp = resp->rqstp;
- struct kvec *resv = &resp->rqstp->rq_res.head[0];
- int len;
-
- /* Current request rpc header length*/
- len = (char *)resp->cstate.statp -
- (char *)page_address(rqstp->rq_respages[0]);
- if (entry->ce_datav.iov_len + len > PAGE_SIZE) {
- dprintk("%s v41 cached reply too large (%Zd).\n", __func__,
- entry->ce_datav.iov_len);
- return 0;
- }
- /* copy the cached reply nfsd data past the current rpc header */
- memcpy((char *)resv->iov_base + len, entry->ce_datav.iov_base,
- entry->ce_datav.iov_len);
- resv->iov_len = len + entry->ce_datav.iov_len;
- return 1;
+ slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
+ base = (char *)resp->cstate.datap -
+ (char *)resp->xbuf->head[0].iov_base;
+ if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
+ slot->sl_datalen))
+ WARN("%s: sessions DRC could not cache compound\n", __func__);
+ return;
}
/*
@@ -1095,14 +1032,14 @@ nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
struct nfsd4_slot *slot = resp->cstate.slot;
dprintk("--> %s resp->opcnt %d cachethis %u \n", __func__,
- resp->opcnt, resp->cstate.slot->sl_cache_entry.ce_cachethis);
+ resp->opcnt, resp->cstate.slot->sl_cachethis);
/* Encode the replayed sequence operation */
op = &args->ops[resp->opcnt - 1];
nfsd4_encode_operation(resp, op);
/* Return nfserr_retry_uncached_rep in next operation. */
- if (args->opcnt > 1 && slot->sl_cache_entry.ce_cachethis == 0) {
+ if (args->opcnt > 1 && slot->sl_cachethis == 0) {
op = &args->ops[resp->opcnt++];
op->status = nfserr_retry_uncached_rep;
nfsd4_encode_operation(resp, op);
@@ -1111,57 +1048,29 @@ nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
}
/*
- * Keep the first page of the replay. Copy the NFSv4.1 data from the first
- * cached page. Replace any futher replay pages from the cache.
+ * The sequence operation is not cached because we can use the slot and
+ * session values.
*/
__be32
nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
struct nfsd4_sequence *seq)
{
- struct nfsd4_cache_entry *entry = &resp->cstate.slot->sl_cache_entry;
+ struct nfsd4_slot *slot = resp->cstate.slot;
__be32 status;
- dprintk("--> %s entry %p\n", __func__, entry);
-
- /*
- * If this is just the sequence operation, we did not keep
- * a page in the cache entry because we can just use the
- * slot info stored in struct nfsd4_sequence that was checked
- * against the slot in nfsd4_sequence().
- *
- * This occurs when seq->cachethis is FALSE, or when the client
- * session inactivity timer fires and a solo sequence operation
- * is sent (lease renewal).
- */
+ dprintk("--> %s slot %p\n", __func__, slot);
/* Either returns 0 or nfserr_retry_uncached */
status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
if (status == nfserr_retry_uncached_rep)
return status;
- if (!nfsd41_copy_replay_data(resp, entry)) {
- /*
- * Not enough room to use the replay rpc header, send the
- * cached header. Release all the allocated result pages.
- */
- svc_free_res_pages(resp->rqstp);
- nfsd4_copy_pages(resp->rqstp->rq_respages, entry->ce_respages,
- entry->ce_resused);
- } else {
- /* Release all but the first allocated result page */
-
- resp->rqstp->rq_resused--;
- svc_free_res_pages(resp->rqstp);
-
- nfsd4_copy_pages(&resp->rqstp->rq_respages[1],
- &entry->ce_respages[1],
- entry->ce_resused - 1);
- }
+ /* The sequence operation has been encoded, cstate->datap set. */
+ memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
- resp->rqstp->rq_resused = entry->ce_resused;
- resp->opcnt = entry->ce_opcnt;
- resp->cstate.iovlen = entry->ce_datav.iov_len + entry->ce_rpchdrlen;
- status = entry->ce_status;
+ resp->opcnt = slot->sl_opcnt;
+ resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
+ status = slot->sl_status;
return status;
}
@@ -1493,7 +1402,7 @@ nfsd4_sequence(struct svc_rqst *rqstp,
if (seq->slotid >= session->se_fchannel.maxreqs)
goto out;
- slot = &session->se_slots[seq->slotid];
+ slot = session->se_slots[seq->slotid];
dprintk("%s: slotid %d\n", __func__, seq->slotid);
/* We do not negotiate the number of slots yet, so set the
@@ -1506,7 +1415,7 @@ nfsd4_sequence(struct svc_rqst *rqstp,
cstate->slot = slot;
cstate->session = session;
/* Return the cached reply status and set cstate->status
- * for nfsd4_svc_encode_compoundres processing */
+ * for nfsd4_proc_compound processing */
status = nfsd4_replay_cache_entry(resp, seq);
cstate->status = nfserr_replay_cache;
goto out;
@@ -1517,7 +1426,7 @@ nfsd4_sequence(struct svc_rqst *rqstp,
/* Success! bump slot seqid */
slot->sl_inuse = true;
slot->sl_seqid = seq->seqid;
- slot->sl_cache_entry.ce_cachethis = seq->cachethis;
+ slot->sl_cachethis = seq->cachethis;
cstate->slot = slot;
cstate->session = session;