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370 lines
11 KiB
C
370 lines
11 KiB
C
/* NFSv4.1 client for Windows
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* Copyright © 2012 The Regents of the University of Michigan
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*
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* Olga Kornievskaia <aglo@umich.edu>
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* Casey Bodley <cbodley@umich.edu>
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at
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* your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* without any warranty; without even the implied warranty of merchantability
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* or fitness for a particular purpose. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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*/
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#include <windows.h>
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#include <stdio.h>
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#include "daemon_debug.h"
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#include "delegation.h"
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#include "nfs41_ops.h"
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#include "upcall.h"
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#include "util.h"
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#define LKLVL 2 /* dprintf level for lock logging */
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static void lock_stateid_arg(
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IN nfs41_open_state *state,
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OUT stateid_arg *arg)
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{
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arg->open = state;
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arg->delegation = NULL;
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AcquireSRWLockShared(&state->lock);
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if (state->locks.stateid.seqid) {
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memcpy(&arg->stateid, &state->locks.stateid, sizeof(stateid4));
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arg->type = STATEID_LOCK;
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} else if (state->do_close) {
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memcpy(&arg->stateid, &state->stateid, sizeof(stateid4));
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arg->type = STATEID_OPEN;
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} else {
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memset(&arg->stateid, 0, sizeof(stateid4));
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arg->type = STATEID_SPECIAL;
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}
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ReleaseSRWLockShared(&state->lock);
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}
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/* expects the caller to hold an exclusive lock on nfs41_open_state.lock */
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static void lock_stateid_update(
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OUT nfs41_open_state *state,
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IN const stateid4 *stateid)
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{
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if (state->locks.stateid.seqid == 0) {
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/* if it's a new lock stateid, copy it in */
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memcpy(&state->locks.stateid, stateid, sizeof(stateid4));
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} else if (stateid->seqid > state->locks.stateid.seqid) {
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/* update the seqid if it's more recent */
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state->locks.stateid.seqid = stateid->seqid;
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}
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}
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static void open_lock_add(
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IN nfs41_open_state *open,
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IN const stateid_arg *stateid,
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IN nfs41_lock_state *lock)
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{
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AcquireSRWLockExclusive(&open->lock);
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if (stateid->type == STATEID_LOCK)
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lock_stateid_update(open, &stateid->stateid);
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lock->id = open->locks.counter++;
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list_add_tail(&open->locks.list, &lock->open_entry);
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ReleaseSRWLockExclusive(&open->lock);
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}
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static bool_t open_lock_delegate(
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IN nfs41_open_state *open,
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IN nfs41_lock_state *lock)
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{
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bool_t delegated = FALSE;
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AcquireSRWLockExclusive(&open->lock);
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if (open->delegation.state) {
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nfs41_delegation_state *deleg = open->delegation.state;
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AcquireSRWLockShared(&deleg->lock);
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if (deleg->state.type == OPEN_DELEGATE_WRITE
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&& deleg->status == DELEGATION_GRANTED) {
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lock->delegated = 1;
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lock->id = open->locks.counter++;
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list_add_tail(&open->locks.list, &lock->open_entry);
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delegated = TRUE;
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}
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ReleaseSRWLockShared(&deleg->lock);
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}
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ReleaseSRWLockExclusive(&open->lock);
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return delegated;
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}
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#define lock_entry(pos) list_container(pos, nfs41_lock_state, open_entry)
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static int lock_range_cmp(const struct list_entry *entry, const void *value)
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{
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const nfs41_lock_state *lhs = lock_entry(entry);
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const nfs41_lock_state *rhs = (const nfs41_lock_state*)value;
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if (lhs->offset != rhs->offset) return -1;
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if (lhs->length != rhs->length) return -1;
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return 0;
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}
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static int open_unlock_delegate(
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IN nfs41_open_state *open,
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IN const nfs41_lock_state *input)
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{
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struct list_entry *entry;
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int status = ERROR_NOT_LOCKED;
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AcquireSRWLockExclusive(&open->lock);
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/* find lock state that matches this range */
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entry = list_search(&open->locks.list, input, lock_range_cmp);
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if (entry) {
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nfs41_lock_state *lock = lock_entry(entry);
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if (lock->delegated) {
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/* if the lock was delegated, remove/free it and return success */
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list_remove(entry);
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free(lock);
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status = NO_ERROR;
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} else
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status = ERROR_LOCKED;
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}
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ReleaseSRWLockExclusive(&open->lock);
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return status;
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}
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static void open_unlock_remove(
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IN nfs41_open_state *open,
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IN const stateid_arg *stateid,
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IN const nfs41_lock_state *input)
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{
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struct list_entry *entry;
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AcquireSRWLockExclusive(&open->lock);
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if (stateid->type == STATEID_LOCK)
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lock_stateid_update(open, &stateid->stateid);
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/* find and remove the unlocked range */
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entry = list_search(&open->locks.list, input, lock_range_cmp);
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if (entry) {
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list_remove(entry);
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free(lock_entry(entry));
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}
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ReleaseSRWLockExclusive(&open->lock);
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}
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/* NFS41_LOCK */
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static int parse_lock(unsigned char *buffer, uint32_t length, nfs41_upcall *upcall)
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{
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int status;
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lock_upcall_args *args = &upcall->args.lock;
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status = safe_read(&buffer, &length, &args->offset, sizeof(LONGLONG));
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if (status) goto out;
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status = safe_read(&buffer, &length, &args->length, sizeof(LONGLONG));
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if (status) goto out;
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status = safe_read(&buffer, &length, &args->exclusive, sizeof(BOOLEAN));
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if (status) goto out;
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status = safe_read(&buffer, &length, &args->blocking, sizeof(BOOLEAN));
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if (status) goto out;
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dprintf(1, "parsing NFS41_LOCK: offset=0x%llx length=0x%llx exclusive=%u "
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"blocking=%u\n", args->offset, args->length, args->exclusive,
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args->blocking);
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out:
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return status;
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}
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static __inline uint32_t get_lock_type(BOOLEAN exclusive, BOOLEAN blocking)
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{
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return blocking == 0
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? ( exclusive == 0 ? READ_LT : WRITE_LT )
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: ( exclusive == 0 ? READW_LT : WRITEW_LT );
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}
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static int handle_lock(nfs41_upcall *upcall)
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{
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stateid_arg stateid;
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lock_upcall_args *args = &upcall->args.lock;
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nfs41_open_state *state = upcall->state_ref;
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nfs41_lock_state *lock;
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const uint32_t type = get_lock_type(args->exclusive, args->blocking);
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int status = NO_ERROR;
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/* 18.10.3. Operation 12: LOCK - Create Lock
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* "To lock the file from a specific offset through the end-of-file
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* (no matter how long the file actually is) use a length field equal
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* to NFS4_UINT64_MAX." */
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if (args->length >= NFS4_UINT64_MAX - args->offset)
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args->length = NFS4_UINT64_MAX;
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/* allocate the lock state */
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lock = calloc(1, sizeof(nfs41_lock_state));
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if (lock == NULL) {
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status = GetLastError();
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goto out;
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}
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lock->offset = args->offset;
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lock->length = args->length;
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lock->exclusive = args->exclusive;
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/* if we hold a write delegation, handle the lock locally */
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if (open_lock_delegate(state, lock)) {
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dprintf(LKLVL, "delegated lock { %llu, %llu }\n",
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lock->offset, lock->length);
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args->acquired = TRUE; /* for cancel_lock() */
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goto out;
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}
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/* open_to_lock_owner4 requires an open stateid; if we
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* have a delegation, convert it to an open stateid */
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status = nfs41_delegation_to_open(state, TRUE);
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if (status) {
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status = ERROR_FILE_INVALID;
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goto out_free;
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}
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EnterCriticalSection(&state->locks.lock);
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lock_stateid_arg(state, &stateid);
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status = nfs41_lock(state->session, &state->file, &state->owner,
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type, lock->offset, lock->length, FALSE, TRUE, &stateid);
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if (status) {
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dprintf(LKLVL, "nfs41_lock failed with %s\n",
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nfs_error_string(status));
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status = nfs_to_windows_error(status, ERROR_BAD_NET_RESP);
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LeaveCriticalSection(&state->locks.lock);
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goto out_free;
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}
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/* save lock state with the open */
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open_lock_add(state, &stateid, lock);
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LeaveCriticalSection(&state->locks.lock);
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args->acquired = TRUE; /* for cancel_lock() */
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out:
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return status;
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out_free:
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free(lock);
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goto out;
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}
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static void cancel_lock(IN nfs41_upcall *upcall)
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{
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stateid_arg stateid;
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nfs41_lock_state input;
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lock_upcall_args *args = &upcall->args.lock;
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nfs41_open_state *state = upcall->state_ref;
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int status = NO_ERROR;
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dprintf(1, "--> cancel_lock()\n");
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/* can't do 'if (upcall->status)' here, because a handle_lock() success
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* could be overwritten by upcall_marshall() or allocation failure */
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if (!args->acquired)
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goto out;
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input.offset = args->offset;
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input.length = args->length;
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/* search for the range to unlock, and remove if delegated */
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status = open_unlock_delegate(state, &input);
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if (status != ERROR_LOCKED)
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goto out;
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EnterCriticalSection(&state->locks.lock);
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lock_stateid_arg(state, &stateid);
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status = nfs41_unlock(state->session, &state->file,
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args->offset, args->length, &stateid);
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open_unlock_remove(state, &stateid, &input);
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LeaveCriticalSection(&state->locks.lock);
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status = nfs_to_windows_error(status, ERROR_BAD_NET_RESP);
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out:
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dprintf(1, "<-- cancel_lock() returning %d\n", status);
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}
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/* NFS41_UNLOCK */
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static int parse_unlock(unsigned char *buffer, uint32_t length, nfs41_upcall *upcall)
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{
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int status;
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unlock_upcall_args *args = &upcall->args.unlock;
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status = safe_read(&buffer, &length, &args->count, sizeof(ULONG));
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if (status) goto out;
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args->buf = buffer;
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args->buf_len = length;
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dprintf(1, "parsing NFS41_UNLOCK: count=%u\n", args->count);
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out:
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return status;
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}
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static int handle_unlock(nfs41_upcall *upcall)
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{
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nfs41_lock_state input;
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stateid_arg stateid;
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unlock_upcall_args *args = &upcall->args.unlock;
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nfs41_open_state *state = upcall->state_ref;
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unsigned char *buf = args->buf;
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uint32_t buf_len = args->buf_len;
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uint32_t i;
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int status = NO_ERROR;
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for (i = 0; i < args->count; i++) {
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if (safe_read(&buf, &buf_len, &input.offset, sizeof(LONGLONG))) break;
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if (safe_read(&buf, &buf_len, &input.length, sizeof(LONGLONG))) break;
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/* do the same translation as LOCK, or the ranges won't match */
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if (input.length >= NFS4_UINT64_MAX - input.offset)
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input.length = NFS4_UINT64_MAX;
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/* search for the range to unlock, and remove if delegated */
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status = open_unlock_delegate(state, &input);
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if (status != ERROR_LOCKED)
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continue;
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EnterCriticalSection(&state->locks.lock);
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lock_stateid_arg(state, &stateid);
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status = nfs41_unlock(state->session, &state->file,
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input.offset, input.length, &stateid);
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open_unlock_remove(state, &stateid, &input);
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LeaveCriticalSection(&state->locks.lock);
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status = nfs_to_windows_error(status, ERROR_BAD_NET_RESP);
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}
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return status;
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}
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const nfs41_upcall_op nfs41_op_lock = {
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parse_lock,
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handle_lock,
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NULL,
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cancel_lock
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};
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const nfs41_upcall_op nfs41_op_unlock = {
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parse_unlock,
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handle_unlock
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};
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