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https://github.com/MariaDB/server.git
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450 lines
12 KiB
C
450 lines
12 KiB
C
/* Copyright (c) 2016, 2021, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#include "mysys_priv.h"
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my_bool my_may_have_atomic_write= IF_WIN(1,0);
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#ifdef __linux__
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my_bool has_shannon_atomic_write= 0, has_fusion_io_atomic_write= 0,
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has_sfx_atomic_write= 0;
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#include <sys/ioctl.h>
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/* Linux seems to allow up to 15 partitions per block device.
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Partition number 0 is the whole block device. */
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# define SAME_DEV(fs_dev, blk_dev) \
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(fs_dev == blk_dev) || ((fs_dev & ~15U) == blk_dev)
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/***********************************************************************
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FUSION_IO
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************************************************************************/
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/** FusionIO atomic write control info */
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#define DFS_IOCTL_ATOMIC_WRITE_SET _IOW(0x95, 2, uint)
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/**
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Check if the system has a funsion_io card
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@return TRUE Card exists
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*/
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static my_bool test_if_fusion_io_card_exists()
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{
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/* Fusion card requires fallocate to exists */
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#ifndef HAVE_POSIX_FALLOCATE
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return 0;
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#else
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return (access("/dev/fcta", F_OK)) == 0;
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#endif
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}
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/**
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Check if a file is on a Fusion_IO device and that it supports atomic_write
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@param[in] file OS file handle
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@param[in] page_size page size
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@return TRUE Atomic write supported
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*/
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static my_bool fusion_io_has_atomic_write(File file, int page_size)
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{
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int atomic= 1;
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if (page_size <= 32768 &&
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ioctl(file, DFS_IOCTL_ATOMIC_WRITE_SET, &atomic) != -1)
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return(TRUE);
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return(FALSE);
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}
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/***********************************************************************
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SHANNON
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************************************************************************/
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#define SHANNON_IOMAGIC 'x'
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#define SHANNON_IOCQATOMIC_SIZE _IO(SHANNON_IOMAGIC, 22)
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#define SHANNON_MAX_DEVICES 32
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#define SHANNON_NO_ATOMIC_SIZE_YET -2
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struct shannon_dev
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{
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char dev_name[32];
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dev_t st_dev;
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int atomic_size;
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};
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static struct shannon_dev shannon_devices[SHANNON_MAX_DEVICES+1];
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/**
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Check if the system has a Shannon card
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If card exists, record device numbers to allow us to later check if
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a given file is on this device.
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@return TRUE Card exists
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*/
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static my_bool test_if_shannon_card_exists()
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{
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uint shannon_found_devices= 0;
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char dev_part;
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uint dev_no;
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if (access("/dev/scta", F_OK) < 0)
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return 0;
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/*
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The Shannon devices are /dev/dfX, where X can be from a-z.
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We have to check all of them as some may be missing if the user
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removed one with the U.2 interface.
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*/
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for (dev_part= 'a' ; dev_part < 'z' ; dev_part++)
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{
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char path[32];
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struct stat stat_buff;
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snprintf(path, sizeof(path), "/dev/df%c", dev_part);
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#ifdef TEST_SHANNON
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if (stat(path, &stat_buff) < 0)
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{
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printf("%s(): stat %s failed.\n", __func__, path);
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break;
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}
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#endif
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shannon_devices[shannon_found_devices].st_dev= stat_buff.st_rdev;
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snprintf(shannon_devices[shannon_found_devices].dev_name,
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sizeof(shannon_devices[shannon_found_devices].dev_name),
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"/dev/sct%c",
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dev_part);
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#ifdef TEST_SHANNON
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printf("%s(): i=%d, stat_buff.st_dev=0x%lx, stat_buff.st_rdev=0x%lx, st_rdev=0x%lx, dev_name=%s\n",
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__func__,
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shannon_found_devices,
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(ulong) stat_buff.st_dev,
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(ulong) stat_buff.st_rdev,
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(ulong) shannon_devices[shannon_found_devices].st_dev,
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shannon_devices[shannon_found_devices].dev_name);
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#endif
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/*
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The atomic size will be checked on first access. This is needed
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as a normal user can't open the /dev/scta file
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*/
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shannon_devices[shannon_found_devices].atomic_size=
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SHANNON_NO_ATOMIC_SIZE_YET;
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if (++shannon_found_devices== SHANNON_MAX_DEVICES)
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goto end;
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for (dev_no= 1 ; dev_no < 9 ; dev_no++)
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{
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snprintf(path, sizeof(path), "/dev/df%c%d", dev_part, dev_no);
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if (stat(path, &stat_buff) < 0)
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break;
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shannon_devices[shannon_found_devices].st_dev= stat_buff.st_rdev;
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snprintf(shannon_devices[shannon_found_devices].dev_name,
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sizeof(shannon_devices[shannon_found_devices].dev_name),
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"/dev/sct%c%d",
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dev_part, dev_no);
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#ifdef TEST_SHANNON
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printf("%s(): i=%d, st_dev=0x%lx, st_rdev=0x%lx, dev_name=%s\n",
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__func__,
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shannon_found_devices,
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(ulong) stat_buff.st_dev,
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(ulong) shannon_devices[shannon_found_devices].st_dev,
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shannon_devices[shannon_found_devices].dev_name);
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#endif
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/*
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The atomic size will be checked on first access. This is needed
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as a normal user can't open the /dev/scta file
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*/
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shannon_devices[shannon_found_devices].atomic_size=
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SHANNON_NO_ATOMIC_SIZE_YET;
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if (++shannon_found_devices == SHANNON_MAX_DEVICES)
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goto end;
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}
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}
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end:
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shannon_devices[shannon_found_devices].st_dev= 0;
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return shannon_found_devices > 0;
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}
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static my_bool shannon_dev_has_atomic_write(struct shannon_dev *dev,
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int page_size)
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{
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#ifdef TEST_SHANNON
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printf("%s: enter: page_size=%d, atomic_size=%d, dev_name=%s\n",
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__func__,
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page_size,
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dev->atomic_size,
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dev->dev_name);
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#endif
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if (dev->atomic_size == SHANNON_NO_ATOMIC_SIZE_YET)
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{
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int fd= open(dev->dev_name, 0);
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if (fd < 0)
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{
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fprintf(stderr, "Unable to determine if atomic writes are supported:"
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" open(\"%s\"): %m\n", dev->dev_name);
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dev->atomic_size= 0; /* Don't try again */
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return FALSE;
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}
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dev->atomic_size= ioctl(fd, SHANNON_IOCQATOMIC_SIZE);
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close(fd);
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}
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#ifdef TEST_SHANNON
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printf("%s: exit: page_size=%d, atomic_size=%d, dev_name=%s\n",
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__func__,
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page_size,
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dev->atomic_size,
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dev->dev_name);
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#endif
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return (page_size <= dev->atomic_size);
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}
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/**
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Check if a file is on a Shannon device and that it supports atomic_write
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@param[in] file OS file handle
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@param[in] page_size page size
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@return TRUE Atomic write supported
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@notes
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This is called only at first open of a file. In this case it's doesn't
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matter so much that we loop over all cards.
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We update the atomic size on first access.
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*/
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static my_bool shannon_has_atomic_write(File file, int page_size)
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{
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struct shannon_dev *dev;
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struct stat stat_buff;
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if (fstat(file, &stat_buff) < 0)
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{
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#ifdef TEST_SHANNON
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printf("%s(): fstat failed\n", __func__);
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#endif
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return 0;
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}
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#ifdef TEST_SHANNON
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printf("%s(): st_dev=0x%lx, st_rdev=0x%lx\n", __func__,
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(ulong) stat_buff.st_dev, (ulong) stat_buff.st_rdev);
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#endif
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for (dev= shannon_devices ; dev->st_dev; dev++)
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{
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#ifdef TEST_SHANNON
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printf("%s(): st_rdev=0x%lx\n", __func__, (ulong) dev->st_dev);
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#endif
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if (SAME_DEV(stat_buff.st_dev, dev->st_dev))
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return shannon_dev_has_atomic_write(dev, page_size);
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}
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return 0;
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}
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/***********************************************************************
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ScaleFlux
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************************************************************************/
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#define SFX_GET_ATOMIC_SIZE _IO('N', 0x244)
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#define SFX_MAX_DEVICES 32
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#define SFX_NO_ATOMIC_SIZE_YET -2
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struct sfx_dev
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{
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char dev_name[32];
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dev_t st_dev;
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int atomic_size;
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};
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static struct sfx_dev sfx_devices[SFX_MAX_DEVICES + 1];
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/**
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Check if the system has a ScaleFlux card
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If card exists, record device numbers to allow us to later check if
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a given file is on this device.
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@return TRUE Card exists
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*/
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static my_bool test_if_sfx_card_exists()
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{
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uint sfx_found_devices = 0;
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uint dev_num;
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for (dev_num = 0; dev_num < SFX_MAX_DEVICES; dev_num++)
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{
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struct stat stat_buff;
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sprintf(sfx_devices[sfx_found_devices].dev_name, "/dev/sfdv%dn1",
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dev_num);
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if (stat(sfx_devices[sfx_found_devices].dev_name, &stat_buff) < 0)
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break;
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sfx_devices[sfx_found_devices].st_dev= stat_buff.st_rdev;
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/*
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The atomic size will be checked on first access. This is needed
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as a normal user can't open the /dev/sfdvXn1 file
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*/
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sfx_devices[sfx_found_devices].atomic_size = SFX_NO_ATOMIC_SIZE_YET;
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if (++sfx_found_devices == SFX_MAX_DEVICES)
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goto end;
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}
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end:
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sfx_devices[sfx_found_devices].st_dev= 0;
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return sfx_found_devices > 0;
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}
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static my_bool sfx_dev_has_atomic_write(struct sfx_dev *dev,
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int page_size)
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{
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if (dev->atomic_size == SFX_NO_ATOMIC_SIZE_YET)
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{
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int fd= open(dev->dev_name, 0);
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if (fd < 0)
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{
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fprintf(stderr, "Unable to determine if atomic writes are supported:"
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" open(\"%s\"): %m\n", dev->dev_name);
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dev->atomic_size= 0; /* Don't try again */
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}
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else
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{
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dev->atomic_size= ioctl(fd, SFX_GET_ATOMIC_SIZE);
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close(fd);
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}
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}
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return (page_size <= dev->atomic_size);
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}
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/**
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Check if a file is on a ScaleFlux device and that it supports atomic_write
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@param[in] file OS file handle
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@param[in] page_size page size
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@return TRUE Atomic write supported
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@notes
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This is called only at first open of a file. In this case it's doesn't
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matter so much that we loop over all cards.
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We update the atomic size on first access.
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*/
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static my_bool sfx_has_atomic_write(File file, int page_size)
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{
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struct sfx_dev *dev;
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struct stat stat_buff;
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if (fstat(file, &stat_buff) == 0)
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for (dev= sfx_devices; dev->st_dev; dev++)
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if (SAME_DEV(stat_buff.st_dev, dev->st_dev))
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return sfx_dev_has_atomic_write(dev, page_size);
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return 0;
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}
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/***********************************************************************
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Generic atomic write code
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************************************************************************/
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/*
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Initialize automic write sub systems.
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Checks if we have any devices that supports atomic write
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*/
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void my_init_atomic_write(void)
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{
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has_shannon_atomic_write= test_if_shannon_card_exists();
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has_fusion_io_atomic_write= test_if_fusion_io_card_exists();
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has_sfx_atomic_write= test_if_sfx_card_exists();
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my_may_have_atomic_write= has_shannon_atomic_write ||
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has_fusion_io_atomic_write || has_sfx_atomic_write;
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#ifdef TEST_SHANNON
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printf("%s(): has_shannon_atomic_write=%d, my_may_have_atomic_write=%d\n",
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__func__,
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has_shannon_atomic_write,
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my_may_have_atomic_write);
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#endif
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}
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/**
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Check if a file supports atomic write
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@return FALSE No atomic write support
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TRUE File supports atomic write
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*/
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my_bool my_test_if_atomic_write(File handle, int page_size)
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{
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#ifdef TEST_SHANNON
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printf("%s(): has_shannon_atomic_write=%d, my_may_have_atomic_write=%d\n",
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__func__,
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has_shannon_atomic_write,
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my_may_have_atomic_write);
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#endif
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if (!my_may_have_atomic_write)
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return 0;
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if (has_shannon_atomic_write &&
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shannon_has_atomic_write(handle, page_size))
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return 1;
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if (has_fusion_io_atomic_write &&
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fusion_io_has_atomic_write(handle, page_size))
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return 1;
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if (has_sfx_atomic_write &&
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sfx_has_atomic_write(handle, page_size))
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return 1;
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return 0;
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}
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#ifdef TEST_SHANNON
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int main()
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{
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int fd, ret;
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my_init_atomic_write();
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fd= open("/u01/1.file", O_RDWR);
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ret= my_test_if_atomic_write(fd, 4096);
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if (ret)
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printf("support atomic_write\n");
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else
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printf("do not support atomic_write\n");
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close(fd);
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return 0;
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}
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#endif
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#else /* __linux__ */
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/* Dummy functions to provide the interfaces for other systems */
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void my_init_atomic_write(void)
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{
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}
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#endif /* __linux__ */
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