diff options
author | Andy Adamson <andros@netapp.com> | 2011-01-06 02:04:32 +0000 |
---|---|---|
committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2011-01-06 14:46:24 -0500 |
commit | c36fca52f5e4594ffd0ff175b328966b0d393184 (patch) | |
tree | 6d771744cc49f0edc0d2b6b2f9fe919163002346 /fs/nfs/callback_proc.c | |
parent | 2c2618c6f29c41a0a966f14f05c8bf45fcabb750 (diff) |
NFS refactor nfs_find_client and reference client across callback processing
Fixes a bug where the nfs_client could be freed during callback processing.
Refactor nfs_find_client to use minorversion specific means to locate the
correct nfs_client structure.
In the NFS layer, V4.0 clients are found using the callback_ident field in the
CB_COMPOUND header. V4.1 clients are found using the sessionID in the
CB_SEQUENCE operation which is also compared against the sessionID associated
with the back channel thread after a successful CREATE_SESSION.
Each of these methods finds the one an only nfs_client associated
with the incoming callback request - so nfs_find_client_next is not needed.
In the RPC layer, the pg_authenticate call needs to find the nfs_client. For
the v4.0 callback service, the callback identifier has not been decoded so a
search by address, version, and minorversion is used. The sessionid for the
sessions based callback service has (usually) not been set for the
pg_authenticate on a CB_NULL call which can be sent prior to the return
of a CREATE_SESSION call, so the sessionid associated with the back channel
thread is not used to find the client in pg_authenticate for CB_NULL calls.
Pass the referenced nfs_client to each CB_COMPOUND operation being proceesed
via the new cb_process_state structure. The reference is held across
cb_compound processing.
Use the new cb_process_state struct to move the NFS4ERR_RETRY_UNCACHED_REP
processing from process_op into nfs4_callback_sequence where it belongs.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/callback_proc.c')
-rw-r--r-- | fs/nfs/callback_proc.c | 167 |
1 files changed, 65 insertions, 102 deletions
diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c index 2950fca0c61b..b70e46da16fc 100644 --- a/fs/nfs/callback_proc.c +++ b/fs/nfs/callback_proc.c @@ -16,26 +16,28 @@ #ifdef NFS_DEBUG #define NFSDBG_FACILITY NFSDBG_CALLBACK #endif - -__be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res) + +__be32 nfs4_callback_getattr(struct cb_getattrargs *args, + struct cb_getattrres *res, + struct cb_process_state *cps) { - struct nfs_client *clp; struct nfs_delegation *delegation; struct nfs_inode *nfsi; struct inode *inode; + res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION); + if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ + goto out; + res->bitmap[0] = res->bitmap[1] = 0; res->status = htonl(NFS4ERR_BADHANDLE); - clp = nfs_find_client(args->addr, 4); - if (clp == NULL) - goto out; dprintk("NFS: GETATTR callback request from %s\n", - rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); + rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); - inode = nfs_delegation_find_inode(clp, &args->fh); + inode = nfs_delegation_find_inode(cps->clp, &args->fh); if (inode == NULL) - goto out_putclient; + goto out; nfsi = NFS_I(inode); rcu_read_lock(); delegation = rcu_dereference(nfsi->delegation); @@ -55,49 +57,41 @@ __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres * out_iput: rcu_read_unlock(); iput(inode); -out_putclient: - nfs_put_client(clp); out: dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status)); return res->status; } -__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy) +__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy, + struct cb_process_state *cps) { - struct nfs_client *clp; struct inode *inode; __be32 res; - res = htonl(NFS4ERR_BADHANDLE); - clp = nfs_find_client(args->addr, 4); - if (clp == NULL) + res = htonl(NFS4ERR_OP_NOT_IN_SESSION); + if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ goto out; dprintk("NFS: RECALL callback request from %s\n", - rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); - - do { - struct nfs_client *prev = clp; - - inode = nfs_delegation_find_inode(clp, &args->fh); - if (inode != NULL) { - /* Set up a helper thread to actually return the delegation */ - switch (nfs_async_inode_return_delegation(inode, &args->stateid)) { - case 0: - res = 0; - break; - case -ENOENT: - if (res != 0) - res = htonl(NFS4ERR_BAD_STATEID); - break; - default: - res = htonl(NFS4ERR_RESOURCE); - } - iput(inode); - } - clp = nfs_find_client_next(prev); - nfs_put_client(prev); - } while (clp != NULL); + rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); + + res = htonl(NFS4ERR_BADHANDLE); + inode = nfs_delegation_find_inode(cps->clp, &args->fh); + if (inode == NULL) + goto out; + /* Set up a helper thread to actually return the delegation */ + switch (nfs_async_inode_return_delegation(inode, &args->stateid)) { + case 0: + res = 0; + break; + case -ENOENT: + if (res != 0) + res = htonl(NFS4ERR_BAD_STATEID); + break; + default: + res = htonl(NFS4ERR_RESOURCE); + } + iput(inode); out: dprintk("%s: exit with status = %d\n", __func__, ntohl(res)); return res; @@ -185,42 +179,6 @@ validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args) } /* - * Returns a pointer to a held 'struct nfs_client' that matches the server's - * address, major version number, and session ID. It is the caller's - * responsibility to release the returned reference. - * - * Returns NULL if there are no connections with sessions, or if no session - * matches the one of interest. - */ - static struct nfs_client *find_client_with_session( - const struct sockaddr *addr, u32 nfsversion, - struct nfs4_sessionid *sessionid) -{ - struct nfs_client *clp; - - clp = nfs_find_client(addr, 4); - if (clp == NULL) - return NULL; - - do { - struct nfs_client *prev = clp; - - if (clp->cl_session != NULL) { - if (memcmp(clp->cl_session->sess_id.data, - sessionid->data, - NFS4_MAX_SESSIONID_LEN) == 0) { - /* Returns a held reference to clp */ - return clp; - } - } - clp = nfs_find_client_next(prev); - nfs_put_client(prev); - } while (clp != NULL); - - return NULL; -} - -/* * For each referring call triple, check the session's slot table for * a match. If the slot is in use and the sequence numbers match, the * client is still waiting for a response to the original request. @@ -276,20 +234,28 @@ out: } __be32 nfs4_callback_sequence(struct cb_sequenceargs *args, - struct cb_sequenceres *res) + struct cb_sequenceres *res, + struct cb_process_state *cps) { struct nfs_client *clp; int i; __be32 status; + cps->clp = NULL; + status = htonl(NFS4ERR_BADSESSION); - clp = find_client_with_session(args->csa_addr, 4, &args->csa_sessionid); + /* Incoming session must match the callback session */ + if (memcmp(&args->csa_sessionid, cps->svc_sid, NFS4_MAX_SESSIONID_LEN)) + goto out; + + clp = nfs4_find_client_sessionid(args->csa_addr, + &args->csa_sessionid, 1); if (clp == NULL) goto out; status = validate_seqid(&clp->cl_session->bc_slot_table, args); if (status) - goto out_putclient; + goto out; /* * Check for pending referring calls. If a match is found, a @@ -298,7 +264,7 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args, */ if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) { status = htonl(NFS4ERR_DELAY); - goto out_putclient; + goto out; } memcpy(&res->csr_sessionid, &args->csa_sessionid, @@ -307,36 +273,36 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args, res->csr_slotid = args->csa_slotid; res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1; res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1; + cps->clp = clp; /* put in nfs4_callback_compound */ -out_putclient: - nfs_put_client(clp); out: for (i = 0; i < args->csa_nrclists; i++) kfree(args->csa_rclists[i].rcl_refcalls); kfree(args->csa_rclists); - if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) - res->csr_status = 0; - else + if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { + cps->drc_status = status; + status = 0; + } else res->csr_status = status; + dprintk("%s: exit with status = %d res->csr_status %d\n", __func__, ntohl(status), ntohl(res->csr_status)); return status; } -__be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy) +__be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy, + struct cb_process_state *cps) { - struct nfs_client *clp; __be32 status; fmode_t flags = 0; status = htonl(NFS4ERR_OP_NOT_IN_SESSION); - clp = nfs_find_client(args->craa_addr, 4); - if (clp == NULL) + if (!cps->clp) /* set in cb_sequence */ goto out; dprintk("NFS: RECALL_ANY callback request from %s\n", - rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); + rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *) &args->craa_type_mask)) @@ -346,7 +312,7 @@ __be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy) flags |= FMODE_WRITE; if (flags) - nfs_expire_all_delegation_types(clp, flags); + nfs_expire_all_delegation_types(cps->clp, flags); status = htonl(NFS4_OK); out: dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); @@ -354,36 +320,33 @@ out: } /* Reduce the fore channel's max_slots to the target value */ -__be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy) +__be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy, + struct cb_process_state *cps) { - struct nfs_client *clp; struct nfs4_slot_table *fc_tbl; __be32 status; status = htonl(NFS4ERR_OP_NOT_IN_SESSION); - clp = nfs_find_client(args->crsa_addr, 4); - if (clp == NULL) + if (!cps->clp) /* set in cb_sequence */ goto out; dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n", - rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR), + rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR), args->crsa_target_max_slots); - fc_tbl = &clp->cl_session->fc_slot_table; + fc_tbl = &cps->clp->cl_session->fc_slot_table; status = htonl(NFS4ERR_BAD_HIGH_SLOT); if (args->crsa_target_max_slots > fc_tbl->max_slots || args->crsa_target_max_slots < 1) - goto out_putclient; + goto out; status = htonl(NFS4_OK); if (args->crsa_target_max_slots == fc_tbl->max_slots) - goto out_putclient; + goto out; fc_tbl->target_max_slots = args->crsa_target_max_slots; - nfs41_handle_recall_slot(clp); -out_putclient: - nfs_put_client(clp); /* balance nfs_find_client */ + nfs41_handle_recall_slot(cps->clp); out: dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); return status; |