cosmetic: recovery.c for client state recovery
recovery.h exposes the following functions for nfs41_compound.c: nfs41_recovery_start_or_wait() nfs41_recovery_finish() nfs41_recover_client_state() nfs41_recover_stateid() Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
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Casey Bodley
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316dfe568a
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8ef3ec9247
5 changed files with 312 additions and 228 deletions
241
daemon/recovery.c
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241
daemon/recovery.c
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/* Copyright (c) 2010
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* The Regents of the University of Michigan
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* All Rights Reserved
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*
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* Permission is granted to use, copy and redistribute this software
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* for noncommercial education and research purposes, so long as no
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* fee is charged, and so long as the name of the University of Michigan
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* is not used in any advertising or publicity pertaining to the use
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* or distribution of this software without specific, written prior
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* authorization. Permission to modify or otherwise create derivative
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* works of this software is not granted.
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*
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* This software is provided as is, without representation or warranty
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* of any kind either express or implied, including without limitation
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* the implied warranties of merchantability, fitness for a particular
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* purpose, or noninfringement. The Regents of the University of
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* Michigan shall not be liable for any damages, including special,
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* indirect, incidental, or consequential damages, with respect to any
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* claim arising out of or in connection with the use of the software,
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* even if it has been or is hereafter advised of the possibility of
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* such damages.
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*/
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#include "recovery.h"
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#include "nfs41_callback.h"
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#include "nfs41_compound.h"
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#include "nfs41_ops.h"
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#include "daemon_debug.h"
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/* session/client recovery uses a lock and condition variable in nfs41_client
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* to prevent multiple threads from attempting to recover at the same time */
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bool_t nfs41_recovery_start_or_wait(
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IN nfs41_client *client)
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{
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bool_t status = TRUE;
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EnterCriticalSection(&client->recovery.lock);
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if (!client->recovery.in_recovery) {
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dprintf(1, "Entering recovery mode for client %llu\n", client->clnt_id);
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client->recovery.in_recovery = TRUE;
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} else {
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status = FALSE;
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dprintf(1, "Waiting for recovery of client %llu\n", client->clnt_id);
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while (client->recovery.in_recovery)
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SleepConditionVariableCS(&client->recovery.cond,
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&client->recovery.lock, INFINITE);
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dprintf(1, "Woke up after recovery of client %llu\n", client->clnt_id);
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}
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LeaveCriticalSection(&client->recovery.lock);
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return status;
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}
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void nfs41_recovery_finish(
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IN nfs41_client *client)
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{
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EnterCriticalSection(&client->recovery.lock);
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dprintf(1, "Finished recovery for client %llu\n", client->clnt_id);
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client->recovery.in_recovery = FALSE;
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WakeAllConditionVariable(&client->recovery.cond);
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LeaveCriticalSection(&client->recovery.lock);
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}
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static int recover_open(
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IN nfs41_session *session,
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IN nfs41_open_state *open)
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{
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open_claim4 claim;
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open_delegation4 delegation;
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stateid_arg stateid;
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struct list_entry *entry;
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nfs41_lock_state *lock;
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int status;
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/* reclaim the open stateid */
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claim.claim = CLAIM_PREVIOUS;
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claim.u.prev.delegate_type = OPEN_DELEGATE_NONE;
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status = nfs41_rpc_open(session, &open->parent, &open->file,
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&open->owner, &claim, open->share_access, open->share_deny,
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OPEN4_NOCREATE, 0, 0, FALSE, &stateid.stateid, &delegation, NULL);
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if (status == NFS4_OK) {
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/* update the open stateid on success */
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memcpy(&open->stateid, &stateid.stateid, sizeof(stateid4));
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} else if (status == NFS4ERR_NO_GRACE) {
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dprintf(1, "not in grace period, retrying a normal open\n");
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status = nfs41_open(open, OPEN4_NOCREATE, 0, 0, FALSE, NULL);
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/* update the stateid arg with the new open->stateid */
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memcpy(&stateid.stateid, &open->stateid, sizeof(stateid4));
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}
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if (status)
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goto out;
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AcquireSRWLockExclusive(&open->lock);
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open->layout = NULL;
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stateid.type = STATEID_OPEN;
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stateid.open = open;
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/* recover any locks for this open */
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list_for_each(entry, &open->locks.list) {
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lock = list_container(entry, nfs41_lock_state, open_entry);
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status = nfs41_lock(session, &open->file, &open->owner,
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lock->type, lock->offset, lock->length, TRUE, FALSE, &stateid);
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if (status == NFS4ERR_NO_GRACE) {
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dprintf(1, "not in grace period, retrying a normal lock\n");
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status = nfs41_lock(session, &open->file, &open->owner,
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lock->type, lock->offset, lock->length, FALSE, FALSE, &stateid);
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}
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if (status == NFS4ERR_BADSESSION)
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break;
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}
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if (status != NFS4ERR_BADSESSION) {
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/* if we got a lock stateid back, save the lock with the open */
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if (stateid.type == STATEID_LOCK)
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memcpy(&open->locks.stateid, &stateid.stateid, sizeof(stateid4));
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else
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open->locks.stateid.seqid = 0;
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}
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ReleaseSRWLockExclusive(&open->lock);
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out:
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return status;
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}
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int nfs41_recover_client_state(
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IN nfs41_session *session,
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IN nfs41_client *client)
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{
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const struct cb_layoutrecall_args recall = { PNFS_LAYOUTTYPE_FILE,
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PNFS_IOMODE_ANY, TRUE, { PNFS_RETURN_ALL } };
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struct client_state *state = &session->client->state;
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struct list_entry *entry;
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nfs41_open_state *open;
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int status = NFS4_OK;
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/* recover each of the client's opens */
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EnterCriticalSection(&state->lock);
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list_for_each(entry, &state->opens) {
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open = list_container(entry, nfs41_open_state, client_entry);
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status = recover_open(session, open);
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if (status == NFS4ERR_BADSESSION)
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break;
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}
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LeaveCriticalSection(&state->lock);
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/* revoke all of the client's layouts */
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pnfs_file_layout_recall(client, &recall);
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if (status != NFS4ERR_BADSESSION) {
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/* send reclaim_complete, but don't fail on errors */
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status = nfs41_reclaim_complete(session);
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if (status && status == NFS4ERR_NOTSUPP)
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eprintf("nfs41_reclaim_complete() failed with %s\n",
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nfs_error_string(status));
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}
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return status;
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}
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bool_t nfs41_recover_stateid(
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IN nfs41_session *session,
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IN nfs_argop4 *argop)
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{
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stateid_arg *stateid = NULL;
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stateid4 *source = NULL;
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bool_t retry = FALSE;
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if (argop->op == OP_CLOSE) {
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nfs41_op_close_args *close = (nfs41_op_close_args*)argop->arg;
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stateid = close->stateid;
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} else if (argop->op == OP_READ) {
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nfs41_read_args *read = (nfs41_read_args*)argop->arg;
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stateid = read->stateid;
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} else if (argop->op == OP_WRITE) {
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nfs41_write_args *write = (nfs41_write_args*)argop->arg;
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stateid = write->stateid;
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} else if (argop->op == OP_LOCK) {
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nfs41_lock_args *lock = (nfs41_lock_args*)argop->arg;
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if (lock->locker.new_lock_owner)
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stateid = lock->locker.u.open_owner.open_stateid;
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else
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stateid = lock->locker.u.lock_owner.lock_stateid;
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} else if (argop->op == OP_LOCKU) {
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nfs41_locku_args *locku = (nfs41_locku_args*)argop->arg;
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stateid = locku->lock_stateid;
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} else if (argop->op == OP_SETATTR) {
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nfs41_setattr_args *setattr = (nfs41_setattr_args*)argop->arg;
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stateid = setattr->stateid;
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} else if (argop->op == OP_LAYOUTGET) {
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pnfs_layoutget_args *lget = (pnfs_layoutget_args*)argop->arg;
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stateid = lget->stateid;
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}
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if (stateid) {
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switch (stateid->type) {
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case STATEID_OPEN:
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case STATEID_LOCK:
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/* if there's recovery in progress, wait for it to finish */
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EnterCriticalSection(&session->client->recovery.lock);
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while (session->client->recovery.in_recovery)
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SleepConditionVariableCS(&session->client->recovery.cond,
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&session->client->recovery.lock, INFINITE);
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LeaveCriticalSection(&session->client->recovery.lock);
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if (stateid->type == STATEID_OPEN)
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source = &stateid->open->stateid;
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else
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source = &stateid->open->locks.stateid;
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/* if the source stateid is different, update and retry */
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AcquireSRWLockShared(&stateid->open->lock);
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if (memcmp(&stateid->stateid, source, sizeof(stateid4))) {
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/* if it was a lock stateid that was cleared, resend it with an open stateid */
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if (argop->op == OP_LOCK && stateid->type == STATEID_LOCK && source->seqid == 0) {
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nfs41_lock_args *lock = (nfs41_lock_args*)argop->arg;
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lock->locker.new_lock_owner = 1;
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lock->locker.u.open_owner.open_stateid = stateid;
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lock->locker.u.open_owner.lock_owner = &stateid->open->owner;
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source = &stateid->open->stateid;
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}
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memcpy(&stateid->stateid, source, sizeof(stateid4));
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retry = TRUE;
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}
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ReleaseSRWLockShared(&stateid->open->lock);
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break;
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default:
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eprintf("%s can't recover stateid type %u\n",
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nfs_opnum_to_string(argop->op), stateid->type);
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break;
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}
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}
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return retry;
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}
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