174 lines
3.1 KiB
C
174 lines
3.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* polar_pfsd.c
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*
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* Copyright (c) 2020, Alibaba Group Holding Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* IDENTIFICATION
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* external/polar_vfs/polar_pfsd.c
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*
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*-------------------------------------------------------------------------
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*/
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#include <unistd.h>
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#include <sys/time.h>
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#include "postgres.h"
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#include "port.h"
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#include "funcapi.h"
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#include "storage/backendid.h"
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#include "storage/ipc.h"
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#include "storage/pg_shmem.h"
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#include "storage/shmem.h"
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#include "storage/lwlock.h"
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#ifdef USE_PFSD
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#include "pfsd_sdk.h"
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#endif
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/* POLAR */
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#include "storage/polar_pfsd.h"
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/* POLAR END */
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int max_pfsd_io_size = PFSD_DEFAULT_MAX_IOSIZE;
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ssize_t
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polar_pfsd_write(int fd, const void *buf, size_t len)
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{
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ssize_t res = -1;
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char *from;
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ssize_t nleft;
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ssize_t writesize;
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ssize_t count = 0;
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nleft = len;
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from = (char *)buf;
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while (nleft > 0)
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{
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writesize = Min(nleft, max_pfsd_io_size);
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res = pfsd_write(fd, from, writesize);
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if (res <= 0)
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{
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if (count == 0)
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count = res;
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break;
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}
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count += res;
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nleft -= res;
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from += res;
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}
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return count;
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}
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ssize_t
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polar_pfsd_read(int fd, void *buf, size_t len)
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{
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ssize_t res = -1;
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ssize_t iolen = 0;
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ssize_t nleft = len;
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char *from = (char *)buf;
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ssize_t count = 0;
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while (nleft > 0)
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{
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iolen = Min(nleft, max_pfsd_io_size);
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res = pfsd_read(fd, from, iolen);
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if (res <= 0)
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{
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if (count == 0)
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count = res;
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break;
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}
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count += res;
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from += res;
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nleft -= res;
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}
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return count;
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}
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ssize_t
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polar_pfsd_pread(int fd, void *buf, size_t len, off_t offset)
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{
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ssize_t res = -1;
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ssize_t iolen = 0;
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off_t off = offset;
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ssize_t nleft = len;
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char *from = (char *)buf;
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ssize_t count = 0;
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while (nleft > 0)
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{
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iolen = Min(nleft, max_pfsd_io_size);
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res = pfsd_pread(fd, from, iolen, off);
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if (res <= 0)
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{
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if (count == 0)
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count = res;
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break;
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}
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count += res;
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from += res;
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off += res;
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nleft -= res;
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}
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return count;
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}
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ssize_t
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polar_pfsd_pwrite(int fd, const void *buf, size_t len, off_t offset)
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{
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char *from;
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ssize_t nleft;
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off_t startoffset;
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ssize_t writesize;
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ssize_t res = -1;
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ssize_t count = 0;
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nleft = len;
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from = (char *)buf;
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startoffset = offset;
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while (nleft > 0)
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{
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writesize = Min(nleft, max_pfsd_io_size);
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res = pfsd_pwrite(fd, from, writesize, startoffset);
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if (res <= 0)
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{
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if (count == 0)
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count = res;
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break;
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}
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count += res;
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nleft -= res;
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from += res;
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startoffset += res;
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}
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return count;
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}
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