![Alexandros Batsakis](/assets/img/avatar_default.png)
in NFSv4.1 the seqid part of a stateid in CB_RECALL must be 0 Signed-off-by: Alexandros Batsakis <batsakis@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
293 lines
7.5 KiB
C
293 lines
7.5 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 "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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down_read(&nfsi->rwsem);
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delegation = 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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up_read(&nfsi->rwsem);
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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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static int (*nfs_validate_delegation_stateid(struct nfs_client *clp))(struct nfs_delegation *, const nfs4_stateid *)
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{
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#if defined(CONFIG_NFS_V4_1)
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if (clp->cl_minorversion > 0)
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return nfs41_validate_delegation_stateid;
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#endif
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return nfs4_validate_delegation_stateid;
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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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nfs_validate_delegation_stateid(clp))) {
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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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/* seqid is 4-bytes long */
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if (((u32 *) &stateid->data)[0] != 0)
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return 0;
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if (memcmp(&delegation->stateid.data[4], &stateid->data[4],
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sizeof(stateid->data)-4))
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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, so at this time
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* we will log replays, and process them as if we had not seen them before,
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* but we don't bump the sequence in the slot. Not too worried about it,
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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 int
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validate_seqid(struct nfs4_slot_table *tbl, u32 slotid, u32 seqid)
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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__, slotid, seqid);
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if (slotid > NFS41_BC_MAX_CALLBACKS)
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return htonl(NFS4ERR_BADSLOT);
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slot = tbl->slots + 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(seqid == 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 (seqid == slot->seq_nr) {
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dprintk("%s seqid %d is a replay - no DRC available\n",
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__func__, seqid);
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return htonl(NFS4_OK);
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}
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/* Wraparound */
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if (seqid == 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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/* FIXME: referring calls should be processed */
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unsigned 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, status;
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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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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,
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args->csa_slotid, args->csa_sequenceid);
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if (status)
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goto out_putclient;
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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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dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
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res->csr_status = status;
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return res->csr_status;
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}
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unsigned 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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int 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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#endif /* CONFIG_NFS_V4_1 */
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