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/*
* Copyright (c) 2007, XenSource Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of XenSource Inc. nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <errno.h>
#include <libaio.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/statvfs.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <linux/fs.h>
#include "tapdisk.h"
#include "tapdisk-driver.h"
#include "tapdisk-interface.h"
#define MAX_AIO_REQS TAPDISK_DATA_REQUESTS
struct tdaio_state;
struct aio_request {
td_request_t treq;
struct tiocb tiocb;
struct tdaio_state *state;
};
struct tdaio_state {
int fd;
td_driver_t *driver;
int aio_free_count;
struct aio_request aio_requests[MAX_AIO_REQS];
struct aio_request *aio_free_list[MAX_AIO_REQS];
};
/*Get Image size, secsize*/
static int tdaio_get_image_info(int fd, td_disk_info_t *info)
{
int ret;
long size;
unsigned long total_size;
struct statvfs statBuf;
struct stat stat;
ret = fstat(fd, &stat);
if (ret != 0) {
DPRINTF("ERROR: fstat failed, Couldn't stat image");
return -EINVAL;
}
if (S_ISBLK(stat.st_mode)) {
/*Accessing block device directly*/
info->size = 0;
if (ioctl(fd,BLKGETSIZE,&info->size)!=0) {
DPRINTF("ERR: BLKGETSIZE failed, couldn't stat image");
return -EINVAL;
}
DPRINTF("Image size: \n\tpre sector_shift [%llu]\n\tpost "
"sector_shift [%llu]\n",
(long long unsigned)(info->size << SECTOR_SHIFT),
(long long unsigned)info->size);
/*Get the sector size*/
#if defined(BLKSSZGET)
{
int arg;
info->sector_size = DEFAULT_SECTOR_SIZE;
ioctl(fd, BLKSSZGET, &info->sector_size);
if (info->sector_size != DEFAULT_SECTOR_SIZE)
DPRINTF("Note: sector size is %ld (not %d)\n",
info->sector_size, DEFAULT_SECTOR_SIZE);
}
#else
info->sector_size = DEFAULT_SECTOR_SIZE;
#endif
} else {
/*Local file? try fstat instead*/
info->size = (stat.st_size >> SECTOR_SHIFT);
info->sector_size = DEFAULT_SECTOR_SIZE;
DPRINTF("Image size: \n\tpre sector_shift [%llu]\n\tpost "
"sector_shift [%llu]\n",
(long long unsigned)(info->size << SECTOR_SHIFT),
(long long unsigned)info->size);
}
if (info->size == 0) {
info->size =((uint64_t) 16836057);
info->sector_size = DEFAULT_SECTOR_SIZE;
}
info->info = 0;
return 0;
}
/* Open the disk file and initialize aio state. */
int tdaio_open(td_driver_t *driver, const char *name, td_flag_t flags)
{
int i, fd, ret, o_flags;
struct tdaio_state *prv;
ret = 0;
prv = (struct tdaio_state *)driver->data;
DPRINTF("block-aio open('%s')", name);
memset(prv, 0, sizeof(struct tdaio_state));
prv->aio_free_count = MAX_AIO_REQS;
for (i = 0; i < MAX_AIO_REQS; i++)
prv->aio_free_list[i] = &prv->aio_requests[i];
/* Open the file */
o_flags = O_DIRECT | O_LARGEFILE |
((flags & TD_OPEN_RDONLY) ? O_RDONLY : O_RDWR);
fd = open(name, o_flags);
if ( (fd == -1) && (errno == EINVAL) ) {
/* Maybe O_DIRECT isn't supported. */
o_flags &= ~O_DIRECT;
fd = open(name, o_flags);
if (fd != -1) DPRINTF("WARNING: Accessing image without"
"O_DIRECT! (%s)\n", name);
} else if (fd != -1) DPRINTF("open(%s) with O_DIRECT\n", name);
if (fd == -1) {
DPRINTF("Unable to open [%s] (%d)!\n", name, 0 - errno);
ret = 0 - errno;
goto done;
}
ret = tdaio_get_image_info(fd, &driver->info);
if (ret) {
close(fd);
goto done;
}
prv->fd = fd;
done:
return ret;
}
void tdaio_complete(void *arg, struct tiocb *tiocb, int err)
{
struct aio_request *aio = (struct aio_request *)arg;
struct tdaio_state *prv = aio->state;
td_complete_request(aio->treq, err);
prv->aio_free_list[prv->aio_free_count++] = aio;
}
void tdaio_queue_read(td_driver_t *driver, td_request_t treq)
{
int size;
uint64_t offset;
struct aio_request *aio;
struct tdaio_state *prv;
prv = (struct tdaio_state *)driver->data;
size = treq.secs * driver->info.sector_size;
offset = treq.sec * (uint64_t)driver->info.sector_size;
if (prv->aio_free_count == 0)
goto fail;
aio = prv->aio_free_list[--prv->aio_free_count];
aio->treq = treq;
aio->state = prv;
td_prep_read(&aio->tiocb, prv->fd, treq.buf,
size, offset, tdaio_complete, aio);
td_queue_tiocb(driver, &aio->tiocb);
return;
fail:
td_complete_request(treq, -EBUSY);
}
void tdaio_queue_write(td_driver_t *driver, td_request_t treq)
{
int size;
uint64_t offset;
struct aio_request *aio;
struct tdaio_state *prv;
prv = (struct tdaio_state *)driver->data;
size = treq.secs * driver->info.sector_size;
offset = treq.sec * (uint64_t)driver->info.sector_size;
if (prv->aio_free_count == 0)
goto fail;
aio = prv->aio_free_list[--prv->aio_free_count];
aio->treq = treq;
aio->state = prv;
td_prep_write(&aio->tiocb, prv->fd, treq.buf,
size, offset, tdaio_complete, aio);
td_queue_tiocb(driver, &aio->tiocb);
return;
fail:
td_complete_request(treq, -EBUSY);
}
int tdaio_close(td_driver_t *driver)
{
struct tdaio_state *prv = (struct tdaio_state *)driver->data;
close(prv->fd);
return 0;
}
int tdaio_get_parent_id(td_driver_t *driver, td_disk_id_t *id)
{
return TD_NO_PARENT;
}
int tdaio_validate_parent(td_driver_t *driver,
td_driver_t *pdriver, td_flag_t flags)
{
return -EINVAL;
}
struct tap_disk tapdisk_aio = {
.disk_type = "tapdisk_aio",
.flags = 0,
.private_data_size = sizeof(struct tdaio_state),
.td_open = tdaio_open,
.td_close = tdaio_close,
.td_queue_read = tdaio_queue_read,
.td_queue_write = tdaio_queue_write,
.td_get_parent_id = tdaio_get_parent_id,
.td_validate_parent = tdaio_validate_parent,
.td_debug = NULL,
};
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