NFSv4.1: keep seq_res.sr_slot as pointer rather than an index
Having to explicitly initialize sr_slotid to NFS4_MAX_SLOT_TABLE resulted in numerous bugs. Keeping the current slot as a pointer to the slot table is more straight forward and robust as it's implicitly set up to NULL wherever the seq_res member is initialized to zeroes. Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Benny Halevy
Trond Myklebust
parent
7c563cc9f3
commit
dfb4f30983
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@ -334,10 +334,12 @@ static void renew_lease(const struct nfs_server *server, unsigned long timestamp
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* Must be called while holding tbl->slot_tbl_lock
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*/
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static void
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nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
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nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
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{
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int free_slotid = free_slot - tbl->slots;
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int slotid = free_slotid;
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BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
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/* clear used bit in bitmap */
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__clear_bit(slotid, tbl->used_slots);
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@ -379,7 +381,7 @@ static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
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struct nfs4_slot_table *tbl;
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tbl = &res->sr_session->fc_slot_table;
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if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
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if (!res->sr_slot) {
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/* just wake up the next guy waiting since
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* we may have not consumed a slot after all */
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dprintk("%s: No slot\n", __func__);
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@ -387,17 +389,15 @@ static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
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}
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spin_lock(&tbl->slot_tbl_lock);
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nfs4_free_slot(tbl, res->sr_slotid);
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nfs4_free_slot(tbl, res->sr_slot);
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nfs41_check_drain_session_complete(res->sr_session);
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spin_unlock(&tbl->slot_tbl_lock);
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res->sr_slotid = NFS4_MAX_SLOT_TABLE;
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res->sr_slot = NULL;
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}
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static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
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{
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unsigned long timestamp;
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struct nfs4_slot_table *tbl;
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struct nfs4_slot *slot;
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struct nfs_client *clp;
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/*
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@ -410,17 +410,14 @@ static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *
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res->sr_status = NFS_OK;
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/* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
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if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
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if (!res->sr_slot)
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goto out;
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tbl = &res->sr_session->fc_slot_table;
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slot = tbl->slots + res->sr_slotid;
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/* Check the SEQUENCE operation status */
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switch (res->sr_status) {
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case 0:
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/* Update the slot's sequence and clientid lease timer */
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++slot->seq_nr;
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++res->sr_slot->seq_nr;
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timestamp = res->sr_renewal_time;
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clp = res->sr_session->clp;
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do_renew_lease(clp, timestamp);
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@ -433,12 +430,14 @@ static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *
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* returned NFS4ERR_DELAY as per Section 2.10.6.2
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* of RFC5661.
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*/
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dprintk("%s: slot=%d seq=%d: Operation in progress\n",
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__func__, res->sr_slotid, slot->seq_nr);
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dprintk("%s: slot=%ld seq=%d: Operation in progress\n",
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__func__,
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res->sr_slot - res->sr_session->fc_slot_table.slots,
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res->sr_slot->seq_nr);
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goto out_retry;
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default:
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/* Just update the slot sequence no. */
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++slot->seq_nr;
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++res->sr_slot->seq_nr;
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}
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out:
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/* The session may be reset by one of the error handlers. */
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@ -505,10 +504,9 @@ static int nfs41_setup_sequence(struct nfs4_session *session,
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dprintk("--> %s\n", __func__);
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/* slot already allocated? */
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if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
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if (res->sr_slot != NULL)
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return 0;
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res->sr_slotid = NFS4_MAX_SLOT_TABLE;
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tbl = &session->fc_slot_table;
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spin_lock(&tbl->slot_tbl_lock);
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@ -550,7 +548,7 @@ static int nfs41_setup_sequence(struct nfs4_session *session,
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dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
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res->sr_session = session;
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res->sr_slotid = slotid;
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res->sr_slot = slot;
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res->sr_renewal_time = jiffies;
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res->sr_status_flags = 0;
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/*
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@ -576,8 +574,9 @@ int nfs4_setup_sequence(const struct nfs_server *server,
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goto out;
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}
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dprintk("--> %s clp %p session %p sr_slotid %d\n",
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__func__, session->clp, session, res->sr_slotid);
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dprintk("--> %s clp %p session %p sr_slot %ld\n",
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__func__, session->clp, session, res->sr_slot ?
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res->sr_slot - session->fc_slot_table.slots : -1);
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ret = nfs41_setup_sequence(session, args, res, cache_reply,
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task);
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@ -650,7 +649,7 @@ static int nfs4_call_sync_sequence(struct nfs_server *server,
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.callback_data = &data
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};
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res->sr_slotid = NFS4_MAX_SLOT_TABLE;
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res->sr_slot = NULL;
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if (privileged)
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task_setup.callback_ops = &nfs41_call_priv_sync_ops;
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task = rpc_run_task(&task_setup);
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@ -735,7 +734,6 @@ static void nfs4_init_opendata_res(struct nfs4_opendata *p)
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p->o_res.server = p->o_arg.server;
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nfs_fattr_init(&p->f_attr);
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nfs_fattr_init(&p->dir_attr);
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p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
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}
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static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
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@ -1975,7 +1973,6 @@ int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, i
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calldata->res.fattr = &calldata->fattr;
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calldata->res.seqid = calldata->arg.seqid;
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calldata->res.server = server;
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calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
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path_get(path);
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calldata->path = *path;
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@ -2550,7 +2547,7 @@ static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
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args->bitmask = server->cache_consistency_bitmask;
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res->server = server;
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res->seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
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res->seq_res.sr_slot = NULL;
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msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
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}
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@ -2576,7 +2573,6 @@ static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
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msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
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arg->bitmask = server->attr_bitmask;
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res->server = server;
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res->seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
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}
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static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
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@ -3646,7 +3642,6 @@ static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, co
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memcpy(&data->stateid, stateid, sizeof(data->stateid));
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data->res.fattr = &data->fattr;
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data->res.server = server;
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data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
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nfs_fattr_init(data->res.fattr);
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data->timestamp = jiffies;
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data->rpc_status = 0;
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@ -3799,7 +3794,6 @@ static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
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p->arg.fl = &p->fl;
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p->arg.seqid = seqid;
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p->res.seqid = seqid;
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p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
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p->arg.stateid = &lsp->ls_stateid;
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p->lsp = lsp;
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atomic_inc(&lsp->ls_count);
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@ -3979,7 +3973,6 @@ static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
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p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
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p->arg.lock_owner.id = lsp->ls_id.id;
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p->res.lock_seqid = p->arg.lock_seqid;
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p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
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p->lsp = lsp;
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p->server = server;
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atomic_inc(&lsp->ls_count);
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@ -4612,7 +4605,6 @@ int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
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};
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int status;
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res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
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dprintk("--> %s\n", __func__);
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task = rpc_run_task(&task_setup);
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@ -5105,12 +5097,11 @@ static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_
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if (!atomic_inc_not_zero(&clp->cl_count))
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return ERR_PTR(-EIO);
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calldata = kmalloc(sizeof(*calldata), GFP_NOFS);
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calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
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if (calldata == NULL) {
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nfs_put_client(clp);
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return ERR_PTR(-ENOMEM);
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}
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calldata->res.sr_slotid = NFS4_MAX_SLOT_TABLE;
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msg.rpc_argp = &calldata->args;
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msg.rpc_resp = &calldata->res;
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calldata->clp = clp;
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@ -5242,7 +5233,6 @@ static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
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goto out;
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calldata->clp = clp;
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calldata->arg.one_fs = 0;
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calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
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msg.rpc_argp = &calldata->arg;
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msg.rpc_resp = &calldata->res;
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@ -4665,7 +4665,6 @@ static int decode_sequence(struct xdr_stream *xdr,
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struct rpc_rqst *rqstp)
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{
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#if defined(CONFIG_NFS_V4_1)
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struct nfs4_slot *slot;
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struct nfs4_sessionid id;
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u32 dummy;
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int status;
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@ -4697,15 +4696,14 @@ static int decode_sequence(struct xdr_stream *xdr,
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goto out_overflow;
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/* seqid */
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slot = &res->sr_session->fc_slot_table.slots[res->sr_slotid];
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dummy = be32_to_cpup(p++);
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if (dummy != slot->seq_nr) {
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if (dummy != res->sr_slot->seq_nr) {
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dprintk("%s Invalid sequence number\n", __func__);
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goto out_err;
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}
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/* slot id */
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dummy = be32_to_cpup(p++);
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if (dummy != res->sr_slotid) {
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if (dummy != res->sr_slot - res->sr_session->fc_slot_table.slots) {
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dprintk("%s Invalid slot id\n", __func__);
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goto out_err;
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}
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@ -46,7 +46,6 @@ struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount)
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memset(p, 0, sizeof(*p));
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INIT_LIST_HEAD(&p->pages);
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p->npages = pagecount;
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p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
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if (pagecount <= ARRAY_SIZE(p->page_array))
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p->pagevec = p->page_array;
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else {
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@ -262,7 +262,6 @@ nfs_async_unlink(struct inode *dir, struct dentry *dentry)
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status = PTR_ERR(data->cred);
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goto out_free;
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}
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data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
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data->res.dir_attr = &data->dir_attr;
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status = -EBUSY;
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@ -427,7 +426,7 @@ nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
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.flags = RPC_TASK_ASYNC,
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};
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data = kmalloc(sizeof(*data), GFP_KERNEL);
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (data == NULL)
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return ERR_PTR(-ENOMEM);
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task_setup_data.callback_data = data,
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@ -55,7 +55,6 @@ struct nfs_write_data *nfs_commitdata_alloc(void)
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if (p) {
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memset(p, 0, sizeof(*p));
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INIT_LIST_HEAD(&p->pages);
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p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
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}
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return p;
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}
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@ -75,7 +74,6 @@ struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount)
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memset(p, 0, sizeof(*p));
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INIT_LIST_HEAD(&p->pages);
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p->npages = pagecount;
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p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
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if (pagecount <= ARRAY_SIZE(p->page_array))
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p->pagevec = p->page_array;
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else {
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@ -170,7 +170,7 @@ struct nfs4_sequence_args {
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struct nfs4_sequence_res {
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struct nfs4_session *sr_session;
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u8 sr_slotid; /* slot used to send request */
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struct nfs4_slot *sr_slot; /* slot used to send request */
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int sr_status; /* sequence operation status */
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unsigned long sr_renewal_time;
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u32 sr_status_flags;
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