forked from Minki/linux
9449925273
In NFSv4.1 the stateid consists of the other and seqid fields. For layout processing we need to numerically compare the seqid value of layout stateids. To do so, introduce a union to nfs4_stateid to switch between opaque(16 bytes) and opaque(12 bytes) / __be32 Signed-off-by: Alexandros Batsakis <batsakis@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
392 lines
10 KiB
C
392 lines
10 KiB
C
/*
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* linux/fs/nfs/callback_proc.c
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*
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* Copyright (C) 2004 Trond Myklebust
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*
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* NFSv4 callback procedures
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*/
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#include <linux/nfs4.h>
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#include <linux/nfs_fs.h>
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#include <linux/slab.h>
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#include "nfs4_fs.h"
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#include "callback.h"
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#include "delegation.h"
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#include "internal.h"
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#ifdef NFS_DEBUG
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#define NFSDBG_FACILITY NFSDBG_CALLBACK
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#endif
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__be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res)
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{
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struct nfs_client *clp;
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struct nfs_delegation *delegation;
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struct nfs_inode *nfsi;
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struct inode *inode;
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res->bitmap[0] = res->bitmap[1] = 0;
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res->status = htonl(NFS4ERR_BADHANDLE);
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clp = nfs_find_client(args->addr, 4);
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if (clp == NULL)
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goto out;
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dprintk("NFS: GETATTR callback request from %s\n",
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rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
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inode = nfs_delegation_find_inode(clp, &args->fh);
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if (inode == NULL)
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goto out_putclient;
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nfsi = NFS_I(inode);
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rcu_read_lock();
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delegation = rcu_dereference(nfsi->delegation);
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if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
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goto out_iput;
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res->size = i_size_read(inode);
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res->change_attr = delegation->change_attr;
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if (nfsi->npages != 0)
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res->change_attr++;
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res->ctime = inode->i_ctime;
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res->mtime = inode->i_mtime;
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res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
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args->bitmap[0];
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res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
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args->bitmap[1];
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res->status = 0;
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out_iput:
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rcu_read_unlock();
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iput(inode);
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out_putclient:
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nfs_put_client(clp);
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out:
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dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
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return res->status;
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}
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__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy)
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{
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struct nfs_client *clp;
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struct inode *inode;
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__be32 res;
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res = htonl(NFS4ERR_BADHANDLE);
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clp = nfs_find_client(args->addr, 4);
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if (clp == NULL)
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goto out;
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dprintk("NFS: RECALL callback request from %s\n",
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rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
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do {
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struct nfs_client *prev = clp;
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inode = nfs_delegation_find_inode(clp, &args->fh);
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if (inode != NULL) {
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/* Set up a helper thread to actually return the delegation */
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switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
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case 0:
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res = 0;
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break;
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case -ENOENT:
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if (res != 0)
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res = htonl(NFS4ERR_BAD_STATEID);
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break;
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default:
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res = htonl(NFS4ERR_RESOURCE);
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}
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iput(inode);
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}
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clp = nfs_find_client_next(prev);
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nfs_put_client(prev);
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} while (clp != NULL);
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out:
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dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
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return res;
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}
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int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid)
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{
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if (delegation == NULL || memcmp(delegation->stateid.data, stateid->data,
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sizeof(delegation->stateid.data)) != 0)
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return 0;
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return 1;
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}
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#if defined(CONFIG_NFS_V4_1)
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int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid)
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{
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if (delegation == NULL)
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return 0;
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if (stateid->stateid.seqid != 0)
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return 0;
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if (memcmp(&delegation->stateid.stateid.other,
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&stateid->stateid.other,
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NFS4_STATEID_OTHER_SIZE))
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return 0;
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return 1;
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}
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/*
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* Validate the sequenceID sent by the server.
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* Return success if the sequenceID is one more than what we last saw on
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* this slot, accounting for wraparound. Increments the slot's sequence.
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*
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* We don't yet implement a duplicate request cache, instead we set the
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* back channel ca_maxresponsesize_cached to zero. This is OK for now
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* since we only currently implement idempotent callbacks anyway.
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*
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* We have a single slot backchannel at this time, so we don't bother
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* checking the used_slots bit array on the table. The lower layer guarantees
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* a single outstanding callback request at a time.
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*/
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static __be32
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validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
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{
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struct nfs4_slot *slot;
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dprintk("%s enter. slotid %d seqid %d\n",
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__func__, args->csa_slotid, args->csa_sequenceid);
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if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS)
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return htonl(NFS4ERR_BADSLOT);
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slot = tbl->slots + args->csa_slotid;
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dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr);
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/* Normal */
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if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
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slot->seq_nr++;
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return htonl(NFS4_OK);
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}
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/* Replay */
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if (args->csa_sequenceid == slot->seq_nr) {
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dprintk("%s seqid %d is a replay\n",
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__func__, args->csa_sequenceid);
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/* Signal process_op to set this error on next op */
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if (args->csa_cachethis == 0)
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return htonl(NFS4ERR_RETRY_UNCACHED_REP);
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/* The ca_maxresponsesize_cached is 0 with no DRC */
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else if (args->csa_cachethis == 1)
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return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
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}
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/* Wraparound */
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if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
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slot->seq_nr = 1;
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return htonl(NFS4_OK);
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}
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/* Misordered request */
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return htonl(NFS4ERR_SEQ_MISORDERED);
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}
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/*
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* Returns a pointer to a held 'struct nfs_client' that matches the server's
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* address, major version number, and session ID. It is the caller's
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* responsibility to release the returned reference.
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*
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* Returns NULL if there are no connections with sessions, or if no session
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* matches the one of interest.
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*/
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static struct nfs_client *find_client_with_session(
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const struct sockaddr *addr, u32 nfsversion,
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struct nfs4_sessionid *sessionid)
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{
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struct nfs_client *clp;
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clp = nfs_find_client(addr, 4);
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if (clp == NULL)
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return NULL;
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do {
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struct nfs_client *prev = clp;
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if (clp->cl_session != NULL) {
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if (memcmp(clp->cl_session->sess_id.data,
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sessionid->data,
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NFS4_MAX_SESSIONID_LEN) == 0) {
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/* Returns a held reference to clp */
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return clp;
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}
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}
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clp = nfs_find_client_next(prev);
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nfs_put_client(prev);
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} while (clp != NULL);
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return NULL;
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}
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/*
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* For each referring call triple, check the session's slot table for
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* a match. If the slot is in use and the sequence numbers match, the
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* client is still waiting for a response to the original request.
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*/
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static bool referring_call_exists(struct nfs_client *clp,
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uint32_t nrclists,
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struct referring_call_list *rclists)
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{
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bool status = 0;
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int i, j;
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struct nfs4_session *session;
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struct nfs4_slot_table *tbl;
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struct referring_call_list *rclist;
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struct referring_call *ref;
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/*
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* XXX When client trunking is implemented, this becomes
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* a session lookup from within the loop
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*/
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session = clp->cl_session;
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tbl = &session->fc_slot_table;
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for (i = 0; i < nrclists; i++) {
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rclist = &rclists[i];
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if (memcmp(session->sess_id.data,
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rclist->rcl_sessionid.data,
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NFS4_MAX_SESSIONID_LEN) != 0)
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continue;
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for (j = 0; j < rclist->rcl_nrefcalls; j++) {
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ref = &rclist->rcl_refcalls[j];
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dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
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"slotid %u\n", __func__,
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((u32 *)&rclist->rcl_sessionid.data)[0],
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((u32 *)&rclist->rcl_sessionid.data)[1],
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((u32 *)&rclist->rcl_sessionid.data)[2],
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((u32 *)&rclist->rcl_sessionid.data)[3],
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ref->rc_sequenceid, ref->rc_slotid);
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spin_lock(&tbl->slot_tbl_lock);
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status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
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tbl->slots[ref->rc_slotid].seq_nr ==
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ref->rc_sequenceid);
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spin_unlock(&tbl->slot_tbl_lock);
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if (status)
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goto out;
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}
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}
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out:
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return status;
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}
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__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
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struct cb_sequenceres *res)
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{
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struct nfs_client *clp;
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int i;
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__be32 status;
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status = htonl(NFS4ERR_BADSESSION);
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clp = find_client_with_session(args->csa_addr, 4, &args->csa_sessionid);
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if (clp == NULL)
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goto out;
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status = validate_seqid(&clp->cl_session->bc_slot_table, args);
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if (status)
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goto out_putclient;
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/*
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* Check for pending referring calls. If a match is found, a
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* related callback was received before the response to the original
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* call.
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*/
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if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
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status = htonl(NFS4ERR_DELAY);
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goto out_putclient;
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}
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memcpy(&res->csr_sessionid, &args->csa_sessionid,
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sizeof(res->csr_sessionid));
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res->csr_sequenceid = args->csa_sequenceid;
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res->csr_slotid = args->csa_slotid;
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res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
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res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
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out_putclient:
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nfs_put_client(clp);
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out:
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for (i = 0; i < args->csa_nrclists; i++)
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kfree(args->csa_rclists[i].rcl_refcalls);
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kfree(args->csa_rclists);
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if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP))
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res->csr_status = 0;
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else
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res->csr_status = status;
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dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
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ntohl(status), ntohl(res->csr_status));
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return status;
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}
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__be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy)
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{
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struct nfs_client *clp;
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__be32 status;
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fmode_t flags = 0;
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status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
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clp = nfs_find_client(args->craa_addr, 4);
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if (clp == NULL)
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goto out;
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dprintk("NFS: RECALL_ANY callback request from %s\n",
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rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
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if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
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&args->craa_type_mask))
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flags = FMODE_READ;
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if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
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&args->craa_type_mask))
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flags |= FMODE_WRITE;
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if (flags)
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nfs_expire_all_delegation_types(clp, flags);
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status = htonl(NFS4_OK);
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out:
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dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
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return status;
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}
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/* Reduce the fore channel's max_slots to the target value */
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__be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy)
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{
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struct nfs_client *clp;
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struct nfs4_slot_table *fc_tbl;
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__be32 status;
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status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
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clp = nfs_find_client(args->crsa_addr, 4);
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if (clp == NULL)
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goto out;
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dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
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rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
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args->crsa_target_max_slots);
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fc_tbl = &clp->cl_session->fc_slot_table;
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status = htonl(NFS4ERR_BAD_HIGH_SLOT);
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if (args->crsa_target_max_slots > fc_tbl->max_slots ||
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args->crsa_target_max_slots < 1)
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goto out_putclient;
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status = htonl(NFS4_OK);
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if (args->crsa_target_max_slots == fc_tbl->max_slots)
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goto out_putclient;
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fc_tbl->target_max_slots = args->crsa_target_max_slots;
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nfs41_handle_recall_slot(clp);
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out_putclient:
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nfs_put_client(clp); /* balance nfs_find_client */
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out:
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dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
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return status;
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}
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#endif /* CONFIG_NFS_V4_1 */
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