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/* block-aio.c
*
* libaio-based raw disk implementation.
*
* (c) 2006 Andrew Warfield and Julian Chesterfield
*
* NB: This code is not thread-safe.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#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 "tapdisk.h"
#include "tapaio.h"
#include "blk.h"
#define MAX_AIO_REQS (MAX_REQUESTS * MAX_SEGMENTS_PER_REQ)
/* *BSD has no O_LARGEFILE */
#ifndef O_LARGEFILE
#define O_LARGEFILE 0
#endif
struct tdaio_state {
int fd;
tap_aio_context_t aio;
};
/*Get Image size, secsize*/
static int get_image_info(struct td_state *s, int fd)
{
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*/
if (blk_getimagesize(fd, &s->size) != 0)
return -EINVAL;
DPRINTF("Image size: \n\tpre sector_shift [%llu]\n\tpost "
"sector_shift [%llu]\n",
(long long unsigned)(s->size << SECTOR_SHIFT),
(long long unsigned)s->size);
/*Get the sector size*/
if (blk_getsectorsize(fd, &s->sector_size) != 0)
s->sector_size = DEFAULT_SECTOR_SIZE;
} else {
/*Local file? try fstat instead*/
s->size = (stat.st_size >> SECTOR_SHIFT);
s->sector_size = DEFAULT_SECTOR_SIZE;
DPRINTF("Image size: \n\tpre sector_shift [%llu]\n\tpost "
"sector_shift [%llu]\n",
(long long unsigned)(s->size << SECTOR_SHIFT),
(long long unsigned)s->size);
}
if (s->size == 0) {
s->size =((uint64_t) 16836057);
s->sector_size = DEFAULT_SECTOR_SIZE;
}
s->info = 0;
return 0;
}
static inline void init_fds(struct disk_driver *dd)
{
int i;
struct tdaio_state *prv = (struct tdaio_state *)dd->private;
for(i = 0; i < MAX_IOFD; i++)
dd->io_fd[i] = 0;
dd->io_fd[0] = prv->aio.aio_ctx.pollfd;
}
/* Open the disk file and initialize aio state. */
static int tdaio_open (struct disk_driver *dd, const char *name, td_flag_t flags)
{
int i, fd, ret = 0, o_flags;
struct td_state *s = dd->td_state;
struct tdaio_state *prv = (struct tdaio_state *)dd->private;
DPRINTF("block-aio open('%s')", name);
/* Initialize AIO */
ret = tap_aio_init(&prv->aio, 0, MAX_AIO_REQS);
if (ret != 0)
return ret;
/* Open the file */
o_flags = O_DIRECT | O_LARGEFILE |
((flags == TD_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;
}
prv->fd = fd;
init_fds(dd);
ret = get_image_info(s, fd);
done:
return ret;
}
static int tdaio_queue_read(struct disk_driver *dd, uint64_t sector,
int nb_sectors, char *buf, td_callback_t cb,
int id, void *private)
{
struct td_state *s = dd->td_state;
struct tdaio_state *prv = (struct tdaio_state *)dd->private;
int size = nb_sectors * s->sector_size;
uint64_t offset = sector * (uint64_t)s->sector_size;
return tap_aio_read(&prv->aio, prv->fd, size, offset, buf,
cb, id, sector, private);
}
static int tdaio_queue_write(struct disk_driver *dd, uint64_t sector,
int nb_sectors, char *buf, td_callback_t cb,
int id, void *private)
{
struct td_state *s = dd->td_state;
struct tdaio_state *prv = (struct tdaio_state *)dd->private;
int size = nb_sectors * s->sector_size;
uint64_t offset = sector * (uint64_t)s->sector_size;
return tap_aio_write(&prv->aio, prv->fd, size, offset, buf,
cb, id, sector, private);
}
static int tdaio_submit(struct disk_driver *dd)
{
struct tdaio_state *prv = (struct tdaio_state *)dd->private;
return tap_aio_submit(&prv->aio);
}
static int tdaio_close(struct disk_driver *dd)
{
struct tdaio_state *prv = (struct tdaio_state *)dd->private;
io_destroy(prv->aio.aio_ctx.aio_ctx);
close(prv->fd);
return 0;
}
static int tdaio_do_callbacks(struct disk_driver *dd, int sid)
{
int i, nr_events, rsp = 0;
struct io_event *ep;
struct tdaio_state *prv = (struct tdaio_state *)dd->private;
nr_events = tap_aio_get_events(&prv->aio.aio_ctx);
repeat:
for (ep = prv->aio.aio_events, i = nr_events; i-- > 0; ep++) {
struct iocb *io = ep->obj;
struct pending_aio *pio;
pio = &prv->aio.pending_aio[(long)io->data];
rsp += pio->cb(dd, ep->res == io->u.c.nbytes ? 0 : 1,
pio->sector, io->u.c.nbytes >> 9,
pio->id, pio->private);
prv->aio.iocb_free[prv->aio.iocb_free_count++] = io;
}
if (nr_events) {
nr_events = tap_aio_more_events(&prv->aio.aio_ctx);
goto repeat;
}
tap_aio_continue(&prv->aio.aio_ctx);
return rsp;
}
static int tdaio_get_parent_id(struct disk_driver *dd, struct disk_id *id)
{
return TD_NO_PARENT;
}
static int tdaio_validate_parent(struct disk_driver *dd,
struct disk_driver *parent, td_flag_t flags)
{
return -EINVAL;
}
struct tap_disk tapdisk_aio = {
.disk_type = "tapdisk_aio",
.private_data_size = sizeof(struct tdaio_state),
.td_open = tdaio_open,
.td_queue_read = tdaio_queue_read,
.td_queue_write = tdaio_queue_write,
.td_submit = tdaio_submit,
.td_close = tdaio_close,
.td_do_callbacks = tdaio_do_callbacks,
.td_get_parent_id = tdaio_get_parent_id,
.td_validate_parent = tdaio_validate_parent
};
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