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c2c5104b22
qemu/block-raw-posix.c
aliguori f141eafe28 push down vector linearization to posix-aio-compat.c (Christoph Hellwig) 
Make all AIO requests vectored and defer linearization until the actual
I/O thread.  This prepares for using native preadv/pwritev.

Also enables asynchronous direct I/O by handling that case in the I/O thread.

Qcow and qcow2 propably want to be adopted to directly deal with multi-segment
requests, but that can be implemented later.


Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7020 c046a42c-6fe2-441c-8c8c-71466251a162
2009-04-07 18:43:24 +00:00

1431 lines
36 KiB
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/*
* Block driver for RAW files (posix)
*
* Copyright (c) 2006 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (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 "qemu-common.h"
#include "qemu-timer.h"
#include "qemu-char.h"
#include "block_int.h"
#include <assert.h>
#ifdef CONFIG_AIO
#include "posix-aio-compat.h"
#endif
#ifdef CONFIG_COCOA
#include <paths.h>
#include <sys/param.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/IOBSD.h>
#include <IOKit/storage/IOMediaBSDClient.h>
#include <IOKit/storage/IOMedia.h>
#include <IOKit/storage/IOCDMedia.h>
//#include <IOKit/storage/IOCDTypes.h>
#include <CoreFoundation/CoreFoundation.h>
#endif
#ifdef __sun__
#define _POSIX_PTHREAD_SEMANTICS 1
#include <signal.h>
#include <sys/dkio.h>
#endif
#ifdef __linux__
#include <sys/ioctl.h>
#include <linux/cdrom.h>
#include <linux/fd.h>
#endif
#ifdef __FreeBSD__
#include <signal.h>
#include <sys/disk.h>
#include <sys/cdio.h>
#endif
#ifdef __OpenBSD__
#include <sys/ioctl.h>
#include <sys/disklabel.h>
#include <sys/dkio.h>
#endif
#ifdef __DragonFly__
#include <sys/ioctl.h>
#include <sys/diskslice.h>
#endif
//#define DEBUG_FLOPPY
//#define DEBUG_BLOCK
#if defined(DEBUG_BLOCK)
#define DEBUG_BLOCK_PRINT(formatCstr, args...) do { if (qemu_log_enabled()) \
{ qemu_log(formatCstr, ##args); qemu_log_flush(); } } while (0)
#else
#define DEBUG_BLOCK_PRINT(formatCstr, args...)
#endif
/* OS X does not have O_DSYNC */
#ifndef O_DSYNC
#define O_DSYNC O_SYNC
#endif
/* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
#ifndef O_DIRECT
#define O_DIRECT O_DSYNC
#endif
#define FTYPE_FILE 0
#define FTYPE_CD 1
#define FTYPE_FD 2
#define ALIGNED_BUFFER_SIZE (32 * 512)
/* if the FD is not accessed during that time (in ms), we try to
reopen it to see if the disk has been changed */
#define FD_OPEN_TIMEOUT 1000
typedef struct BDRVRawState {
int fd;
int type;
unsigned int lseek_err_cnt;
#if defined(__linux__)
/* linux floppy specific */
int fd_open_flags;
int64_t fd_open_time;
int64_t fd_error_time;
int fd_got_error;
int fd_media_changed;
#endif
#if defined(__FreeBSD__)
int cd_open_flags;
#endif
uint8_t* aligned_buf;
} BDRVRawState;
static int posix_aio_init(void);
static int fd_open(BlockDriverState *bs);
#if defined(__FreeBSD__)
static int cd_open(BlockDriverState *bs);
#endif
static int raw_is_inserted(BlockDriverState *bs);
static int raw_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVRawState *s = bs->opaque;
int fd, open_flags, ret;
posix_aio_init();
s->lseek_err_cnt = 0;
open_flags = O_BINARY;
if ((flags & BDRV_O_ACCESS) == O_RDWR) {
open_flags |= O_RDWR;
} else {
open_flags |= O_RDONLY;
bs->read_only = 1;
}
if (flags & BDRV_O_CREAT)
open_flags |= O_CREAT | O_TRUNC;
/* Use O_DSYNC for write-through caching, no flags for write-back caching,
* and O_DIRECT for no caching. */
if ((flags & BDRV_O_NOCACHE))
open_flags |= O_DIRECT;
else if (!(flags & BDRV_O_CACHE_WB))
open_flags |= O_DSYNC;
s->type = FTYPE_FILE;
fd = open(filename, open_flags, 0644);
if (fd < 0) {
ret = -errno;
if (ret == -EROFS)
ret = -EACCES;
return ret;
}
s->fd = fd;
s->aligned_buf = NULL;
if ((flags & BDRV_O_NOCACHE)) {
s->aligned_buf = qemu_memalign(512, ALIGNED_BUFFER_SIZE);
if (s->aligned_buf == NULL) {
ret = -errno;
close(fd);
return ret;
}
}
return 0;
}
/* XXX: use host sector size if necessary with:
#ifdef DIOCGSECTORSIZE
{
unsigned int sectorsize = 512;
if (!ioctl(fd, DIOCGSECTORSIZE, &sectorsize) &&
sectorsize > bufsize)
bufsize = sectorsize;
}
#endif
#ifdef CONFIG_COCOA
u_int32_t blockSize = 512;
if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
bufsize = blockSize;
}
#endif
*/
/*
* offset and count are in bytes, but must be multiples of 512 for files
* opened with O_DIRECT. buf must be aligned to 512 bytes then.
*
* This function may be called without alignment if the caller ensures
* that O_DIRECT is not in effect.
*/
static int raw_pread_aligned(BlockDriverState *bs, int64_t offset,
uint8_t *buf, int count)
{
BDRVRawState *s = bs->opaque;
int ret;
ret = fd_open(bs);
if (ret < 0)
return ret;
if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
++(s->lseek_err_cnt);
if(s->lseek_err_cnt <= 10) {
DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
"] lseek failed : %d = %s\n",
s->fd, bs->filename, offset, buf, count,
bs->total_sectors, errno, strerror(errno));
}
return -1;
}
s->lseek_err_cnt=0;
ret = read(s->fd, buf, count);
if (ret == count)
goto label__raw_read__success;
DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
"] read failed %d : %d = %s\n",
s->fd, bs->filename, offset, buf, count,
bs->total_sectors, ret, errno, strerror(errno));
/* Try harder for CDrom. */
if (bs->type == BDRV_TYPE_CDROM) {
lseek(s->fd, offset, SEEK_SET);
ret = read(s->fd, buf, count);
if (ret == count)
goto label__raw_read__success;
lseek(s->fd, offset, SEEK_SET);
ret = read(s->fd, buf, count);
if (ret == count)
goto label__raw_read__success;
DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
"] retry read failed %d : %d = %s\n",
s->fd, bs->filename, offset, buf, count,
bs->total_sectors, ret, errno, strerror(errno));
}
label__raw_read__success:
return ret;
}
/*
* offset and count are in bytes, but must be multiples of 512 for files
* opened with O_DIRECT. buf must be aligned to 512 bytes then.
*
* This function may be called without alignment if the caller ensures
* that O_DIRECT is not in effect.
*/
static int raw_pwrite_aligned(BlockDriverState *bs, int64_t offset,
const uint8_t *buf, int count)
{
BDRVRawState *s = bs->opaque;
int ret;
ret = fd_open(bs);
if (ret < 0)
return -errno;
if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
++(s->lseek_err_cnt);
if(s->lseek_err_cnt) {
DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%"
PRId64 "] lseek failed : %d = %s\n",
s->fd, bs->filename, offset, buf, count,
bs->total_sectors, errno, strerror(errno));
}
return -EIO;
}
s->lseek_err_cnt = 0;
ret = write(s->fd, buf, count);
if (ret == count)
goto label__raw_write__success;
DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
"] write failed %d : %d = %s\n",
s->fd, bs->filename, offset, buf, count,
bs->total_sectors, ret, errno, strerror(errno));
label__raw_write__success:
return (ret < 0) ? -errno : ret;
}
/*
* offset and count are in bytes and possibly not aligned. For files opened
* with O_DIRECT, necessary alignments are ensured before calling
* raw_pread_aligned to do the actual read.
*/
static int raw_pread(BlockDriverState *bs, int64_t offset,
uint8_t *buf, int count)
{
BDRVRawState *s = bs->opaque;
int size, ret, shift, sum;
sum = 0;
if (s->aligned_buf != NULL) {
if (offset & 0x1ff) {
/* align offset on a 512 bytes boundary */
shift = offset & 0x1ff;
size = (shift + count + 0x1ff) & ~0x1ff;
if (size > ALIGNED_BUFFER_SIZE)
size = ALIGNED_BUFFER_SIZE;
ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, size);
if (ret < 0)
return ret;
size = 512 - shift;
if (size > count)
size = count;
memcpy(buf, s->aligned_buf + shift, size);
buf += size;
offset += size;
count -= size;
sum += size;
if (count == 0)
return sum;
}
if (count & 0x1ff || (uintptr_t) buf & 0x1ff) {
/* read on aligned buffer */
while (count) {
size = (count + 0x1ff) & ~0x1ff;
if (size > ALIGNED_BUFFER_SIZE)
size = ALIGNED_BUFFER_SIZE;
ret = raw_pread_aligned(bs, offset, s->aligned_buf, size);
if (ret < 0)
return ret;
size = ret;
if (size > count)
size = count;
memcpy(buf, s->aligned_buf, size);
buf += size;
offset += size;
count -= size;
sum += size;
}
return sum;
}
}
return raw_pread_aligned(bs, offset, buf, count) + sum;
}
static int raw_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
int ret;
ret = raw_pread(bs, sector_num * 512, buf, nb_sectors * 512);
if (ret == (nb_sectors * 512))
ret = 0;
return ret;
}
/*
* offset and count are in bytes and possibly not aligned. For files opened
* with O_DIRECT, necessary alignments are ensured before calling
* raw_pwrite_aligned to do the actual write.
*/
static int raw_pwrite(BlockDriverState *bs, int64_t offset,
const uint8_t *buf, int count)
{
BDRVRawState *s = bs->opaque;
int size, ret, shift, sum;
sum = 0;
if (s->aligned_buf != NULL) {
if (offset & 0x1ff) {
/* align offset on a 512 bytes boundary */
shift = offset & 0x1ff;
ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, 512);
if (ret < 0)
return ret;
size = 512 - shift;
if (size > count)
size = count;
memcpy(s->aligned_buf + shift, buf, size);
ret = raw_pwrite_aligned(bs, offset - shift, s->aligned_buf, 512);
if (ret < 0)
return ret;
buf += size;
offset += size;
count -= size;
sum += size;
if (count == 0)
return sum;
}
if (count & 0x1ff || (uintptr_t) buf & 0x1ff) {
while ((size = (count & ~0x1ff)) != 0) {
if (size > ALIGNED_BUFFER_SIZE)
size = ALIGNED_BUFFER_SIZE;
memcpy(s->aligned_buf, buf, size);
ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, size);
if (ret < 0)
return ret;
buf += ret;
offset += ret;
count -= ret;
sum += ret;
}
/* here, count < 512 because (count & ~0x1ff) == 0 */
if (count) {
ret = raw_pread_aligned(bs, offset, s->aligned_buf, 512);
if (ret < 0)
return ret;
memcpy(s->aligned_buf, buf, count);
ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, 512);
if (ret < 0)
return ret;
if (count < ret)
ret = count;
sum += ret;
}
return sum;
}
}
return raw_pwrite_aligned(bs, offset, buf, count) + sum;
}
static int raw_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
int ret;
ret = raw_pwrite(bs, sector_num * 512, buf, nb_sectors * 512);
if (ret == (nb_sectors * 512))
ret = 0;
return ret;
}
#ifdef CONFIG_AIO
/***********************************************************/
/* Unix AIO using POSIX AIO */
typedef struct RawAIOCB {
BlockDriverAIOCB common;
struct qemu_paiocb aiocb;
struct RawAIOCB *next;
int ret;
} RawAIOCB;
typedef struct PosixAioState
{
int rfd, wfd;
RawAIOCB *first_aio;
} PosixAioState;
static void posix_aio_read(void *opaque)
{
PosixAioState *s = opaque;
RawAIOCB *acb, **pacb;
int ret;
ssize_t len;
/* read all bytes from signal pipe */
for (;;) {
char bytes[16];
len = read(s->rfd, bytes, sizeof(bytes));
if (len == -1 && errno == EINTR)
continue; /* try again */
if (len == sizeof(bytes))
continue; /* more to read */
break;
}
for(;;) {
pacb = &s->first_aio;
for(;;) {
acb = *pacb;
if (!acb)
goto the_end;
ret = qemu_paio_error(&acb->aiocb);
if (ret == ECANCELED) {
/* remove the request */
*pacb = acb->next;
qemu_aio_release(acb);
} else if (ret != EINPROGRESS) {
/* end of aio */
if (ret == 0) {
ret = qemu_paio_return(&acb->aiocb);
if (ret == acb->aiocb.aio_nbytes)
ret = 0;
else
ret = -EINVAL;
} else {
ret = -ret;
}
/* remove the request */
*pacb = acb->next;
/* call the callback */
acb->common.cb(acb->common.opaque, ret);
qemu_aio_release(acb);
break;
} else {
pacb = &acb->next;
}
}
}
the_end: ;
}
static int posix_aio_flush(void *opaque)
{
PosixAioState *s = opaque;
return !!s->first_aio;
}
static PosixAioState *posix_aio_state;
static void aio_signal_handler(int signum)
{
if (posix_aio_state) {
char byte = 0;
write(posix_aio_state->wfd, &byte, sizeof(byte));
}
qemu_service_io();
}
static int posix_aio_init(void)
{
struct sigaction act;
PosixAioState *s;
int fds[2];
struct qemu_paioinit ai;
if (posix_aio_state)
return 0;
s = qemu_malloc(sizeof(PosixAioState));
sigfillset(&act.sa_mask);
act.sa_flags = 0; /* do not restart syscalls to interrupt select() */
act.sa_handler = aio_signal_handler;
sigaction(SIGUSR2, &act, NULL);
s->first_aio = NULL;
if (pipe(fds) == -1) {
fprintf(stderr, "failed to create pipe\n");
return -errno;
}
s->rfd = fds[0];
s->wfd = fds[1];
fcntl(s->rfd, F_SETFL, O_NONBLOCK);
fcntl(s->wfd, F_SETFL, O_NONBLOCK);
qemu_aio_set_fd_handler(s->rfd, posix_aio_read, NULL, posix_aio_flush, s);
memset(&ai, 0, sizeof(ai));
ai.aio_threads = 64;
ai.aio_num = 64;
qemu_paio_init(&ai);
posix_aio_state = s;
return 0;
}
static RawAIOCB *raw_aio_setup(BlockDriverState *bs, int64_t sector_num,
QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque)
{
BDRVRawState *s = bs->opaque;
RawAIOCB *acb;
if (fd_open(bs) < 0)
return NULL;
acb = qemu_aio_get(bs, cb, opaque);
if (!acb)
return NULL;
acb->aiocb.aio_fildes = s->fd;
acb->aiocb.ev_signo = SIGUSR2;
acb->aiocb.aio_iov = qiov->iov;
acb->aiocb.aio_niov = qiov->niov;
acb->aiocb.aio_nbytes = nb_sectors * 512;
acb->aiocb.aio_offset = sector_num * 512;
acb->aiocb.aio_flags = 0;
/*
* If O_DIRECT is used the buffer needs to be aligned on a sector
* boundary. Tell the low level code to ensure that in case it's
* not done yet.
*/
if (s->aligned_buf)
acb->aiocb.aio_flags |= QEMU_AIO_SECTOR_ALIGNED;
acb->next = posix_aio_state->first_aio;
posix_aio_state->first_aio = acb;
return acb;
}
static void raw_aio_remove(RawAIOCB *acb)
{
RawAIOCB **pacb;
/* remove the callback from the queue */
pacb = &posix_aio_state->first_aio;
for(;;) {
if (*pacb == NULL) {
fprintf(stderr, "raw_aio_remove: aio request not found!\n");
break;
} else if (*pacb == acb) {
*pacb = acb->next;
qemu_aio_release(acb);
break;
}
pacb = &(*pacb)->next;
}
}
static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque)
{
RawAIOCB *acb;
acb = raw_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque);
if (!acb)
return NULL;
if (qemu_paio_read(&acb->aiocb) < 0) {
raw_aio_remove(acb);
return NULL;
}
return &acb->common;
}
static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque)
{
RawAIOCB *acb;
acb = raw_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque);
if (!acb)
return NULL;
if (qemu_paio_write(&acb->aiocb) < 0) {
raw_aio_remove(acb);
return NULL;
}
return &acb->common;
}
static void raw_aio_cancel(BlockDriverAIOCB *blockacb)
{
int ret;
RawAIOCB *acb = (RawAIOCB *)blockacb;
ret = qemu_paio_cancel(acb->aiocb.aio_fildes, &acb->aiocb);
if (ret == QEMU_PAIO_NOTCANCELED) {
/* fail safe: if the aio could not be canceled, we wait for
it */
while (qemu_paio_error(&acb->aiocb) == EINPROGRESS);
}
raw_aio_remove(acb);
}
#else /* CONFIG_AIO */
static int posix_aio_init(void)
{
return 0;
}
#endif /* CONFIG_AIO */
static void raw_close(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
if (s->fd >= 0) {
close(s->fd);
s->fd = -1;
if (s->aligned_buf != NULL)
qemu_free(s->aligned_buf);
}
}
static int raw_truncate(BlockDriverState *bs, int64_t offset)
{
BDRVRawState *s = bs->opaque;
if (s->type != FTYPE_FILE)
return -ENOTSUP;
if (ftruncate(s->fd, offset) < 0)
return -errno;
return 0;
}
#ifdef __OpenBSD__
static int64_t raw_getlength(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int fd = s->fd;
struct stat st;
if (fstat(fd, &st))
return -1;
if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
struct disklabel dl;
if (ioctl(fd, DIOCGDINFO, &dl))
return -1;
return (uint64_t)dl.d_secsize *
dl.d_partitions[DISKPART(st.st_rdev)].p_size;
} else
return st.st_size;
}
#else /* !__OpenBSD__ */
static int64_t raw_getlength(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int fd = s->fd;
int64_t size;
#ifdef HOST_BSD
struct stat sb;
#ifdef __FreeBSD__
int reopened = 0;
#endif
#endif
#ifdef __sun__
struct dk_minfo minfo;
int rv;
#endif
int ret;
ret = fd_open(bs);
if (ret < 0)
return ret;
#ifdef HOST_BSD
#ifdef __FreeBSD__
again:
#endif
if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
#ifdef DIOCGMEDIASIZE
if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
#elif defined(DIOCGPART)
{
struct partinfo pi;
if (ioctl(fd, DIOCGPART, &pi) == 0)
size = pi.media_size;
else
size = 0;
}
if (size == 0)
#endif
#ifdef CONFIG_COCOA
size = LONG_LONG_MAX;
#else
size = lseek(fd, 0LL, SEEK_END);
#endif
#ifdef __FreeBSD__
switch(s->type) {
case FTYPE_CD:
/* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
if (size == 2048LL * (unsigned)-1)
size = 0;
/* XXX no disc? maybe we need to reopen... */
if (size <= 0 && !reopened && cd_open(bs) >= 0) {
reopened = 1;
goto again;
}
}
#endif
} else
#endif
#ifdef __sun__
/*
* use the DKIOCGMEDIAINFO ioctl to read the size.
*/
rv = ioctl ( fd, DKIOCGMEDIAINFO, &minfo );
if ( rv != -1 ) {
size = minfo.dki_lbsize * minfo.dki_capacity;
} else /* there are reports that lseek on some devices
fails, but irc discussion said that contingency
on contingency was overkill */
#endif
{
size = lseek(fd, 0, SEEK_END);
}
return size;
}
#endif
static int raw_create(const char *filename, int64_t total_size,
const char *backing_file, int flags)
{
int fd;
if (flags || backing_file)
return -ENOTSUP;
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
0644);
if (fd < 0)
return -EIO;
ftruncate(fd, total_size * 512);
close(fd);
return 0;
}
static void raw_flush(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
fsync(s->fd);
}
BlockDriver bdrv_raw = {
.format_name = "raw",
.instance_size = sizeof(BDRVRawState),
.bdrv_probe = NULL, /* no probe for protocols */
.bdrv_open = raw_open,
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_close = raw_close,
.bdrv_create = raw_create,
.bdrv_flush = raw_flush,
#ifdef CONFIG_AIO
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_cancel = raw_aio_cancel,
.aiocb_size = sizeof(RawAIOCB),
#endif
.bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
};
/***********************************************/
/* host device */
#ifdef CONFIG_COCOA
static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
{
kern_return_t kernResult;
mach_port_t masterPort;
CFMutableDictionaryRef classesToMatch;
kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
if ( KERN_SUCCESS != kernResult ) {
printf( "IOMasterPort returned %d\n", kernResult );
}
classesToMatch = IOServiceMatching( kIOCDMediaClass );
if ( classesToMatch == NULL ) {
printf( "IOServiceMatching returned a NULL dictionary.\n" );
} else {
CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
}
kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
if ( KERN_SUCCESS != kernResult )
{
printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
}
return kernResult;
}
kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
{
io_object_t nextMedia;
kern_return_t kernResult = KERN_FAILURE;
*bsdPath = '\0';
nextMedia = IOIteratorNext( mediaIterator );
if ( nextMedia )
{
CFTypeRef bsdPathAsCFString;
bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
if ( bsdPathAsCFString ) {
size_t devPathLength;
strcpy( bsdPath, _PATH_DEV );
strcat( bsdPath, "r" );
devPathLength = strlen( bsdPath );
if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
kernResult = KERN_SUCCESS;
}
CFRelease( bsdPathAsCFString );
}
IOObjectRelease( nextMedia );
}
return kernResult;
}
#endif
static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVRawState *s = bs->opaque;
int fd, open_flags, ret;
posix_aio_init();
#ifdef CONFIG_COCOA
if (strstart(filename, "/dev/cdrom", NULL)) {
kern_return_t kernResult;
io_iterator_t mediaIterator;
char bsdPath[ MAXPATHLEN ];
int fd;
kernResult = FindEjectableCDMedia( &mediaIterator );
kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
if ( bsdPath[ 0 ] != '\0' ) {
strcat(bsdPath,"s0");
/* some CDs don't have a partition 0 */
fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
if (fd < 0) {
bsdPath[strlen(bsdPath)-1] = '1';
} else {
close(fd);
}
filename = bsdPath;
}
if ( mediaIterator )
IOObjectRelease( mediaIterator );
}
#endif
open_flags = O_BINARY;
if ((flags & BDRV_O_ACCESS) == O_RDWR) {
open_flags |= O_RDWR;
} else {
open_flags |= O_RDONLY;
bs->read_only = 1;
}
/* Use O_DSYNC for write-through caching, no flags for write-back caching,
* and O_DIRECT for no caching. */
if ((flags & BDRV_O_NOCACHE))
open_flags |= O_DIRECT;
else if (!(flags & BDRV_O_CACHE_WB))
open_flags |= O_DSYNC;
s->type = FTYPE_FILE;
#if defined(__linux__)
if (strstart(filename, "/dev/cd", NULL)) {
/* open will not fail even if no CD is inserted */
open_flags |= O_NONBLOCK;
s->type = FTYPE_CD;
} else if (strstart(filename, "/dev/fd", NULL)) {
s->type = FTYPE_FD;
s->fd_open_flags = open_flags;
/* open will not fail even if no floppy is inserted */
open_flags |= O_NONBLOCK;
#ifdef CONFIG_AIO
} else if (strstart(filename, "/dev/sg", NULL)) {
bs->sg = 1;
#endif
}
#endif
#if defined(__FreeBSD__)
if (strstart(filename, "/dev/cd", NULL) ||
strstart(filename, "/dev/acd", NULL)) {
s->type = FTYPE_CD;
s->cd_open_flags = open_flags;
}
#endif
s->fd = -1;
fd = open(filename, open_flags, 0644);
if (fd < 0) {
ret = -errno;
if (ret == -EROFS)
ret = -EACCES;
return ret;
}
s->fd = fd;
#if defined(__FreeBSD__)
/* make sure the door isnt locked at this time */
if (s->type == FTYPE_CD)
ioctl (s->fd, CDIOCALLOW);
#endif
#if defined(__linux__)
/* close fd so that we can reopen it as needed */
if (s->type == FTYPE_FD) {
close(s->fd);
s->fd = -1;
s->fd_media_changed = 1;
}
#endif
return 0;
}
#if defined(__linux__)
/* Note: we do not have a reliable method to detect if the floppy is
present. The current method is to try to open the floppy at every
I/O and to keep it opened during a few hundreds of ms. */
static int fd_open(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int last_media_present;
if (s->type != FTYPE_FD)
return 0;
last_media_present = (s->fd >= 0);
if (s->fd >= 0 &&
(qemu_get_clock(rt_clock) - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
close(s->fd);
s->fd = -1;
#ifdef DEBUG_FLOPPY
printf("Floppy closed\n");
#endif
}
if (s->fd < 0) {
if (s->fd_got_error &&
(qemu_get_clock(rt_clock) - s->fd_error_time) < FD_OPEN_TIMEOUT) {
#ifdef DEBUG_FLOPPY
printf("No floppy (open delayed)\n");
#endif
return -EIO;
}
s->fd = open(bs->filename, s->fd_open_flags);
if (s->fd < 0) {
s->fd_error_time = qemu_get_clock(rt_clock);
s->fd_got_error = 1;
if (last_media_present)
s->fd_media_changed = 1;
#ifdef DEBUG_FLOPPY
printf("No floppy\n");
#endif
return -EIO;
}
#ifdef DEBUG_FLOPPY
printf("Floppy opened\n");
#endif
}
if (!last_media_present)
s->fd_media_changed = 1;
s->fd_open_time = qemu_get_clock(rt_clock);
s->fd_got_error = 0;
return 0;
}
static int raw_is_inserted(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int ret;
switch(s->type) {
case FTYPE_CD:
ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
if (ret == CDS_DISC_OK)
return 1;
else
return 0;
break;
case FTYPE_FD:
ret = fd_open(bs);
return (ret >= 0);
default:
return 1;
}
}
/* currently only used by fdc.c, but a CD version would be good too */
static int raw_media_changed(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
switch(s->type) {
case FTYPE_FD:
{
int ret;
/* XXX: we do not have a true media changed indication. It
does not work if the floppy is changed without trying
to read it */
fd_open(bs);
ret = s->fd_media_changed;
s->fd_media_changed = 0;
#ifdef DEBUG_FLOPPY
printf("Floppy changed=%d\n", ret);
#endif
return ret;
}
default:
return -ENOTSUP;
}
}
static int raw_eject(BlockDriverState *bs, int eject_flag)
{
BDRVRawState *s = bs->opaque;
switch(s->type) {
case FTYPE_CD:
if (eject_flag) {
if (ioctl (s->fd, CDROMEJECT, NULL) < 0)
perror("CDROMEJECT");
} else {
if (ioctl (s->fd, CDROMCLOSETRAY, NULL) < 0)
perror("CDROMEJECT");
}
break;
case FTYPE_FD:
{
int fd;
if (s->fd >= 0) {
close(s->fd);
s->fd = -1;
}
fd = open(bs->filename, s->fd_open_flags | O_NONBLOCK);
if (fd >= 0) {
if (ioctl(fd, FDEJECT, 0) < 0)
perror("FDEJECT");
close(fd);
}
}
break;
default:
return -ENOTSUP;
}
return 0;
}
static int raw_set_locked(BlockDriverState *bs, int locked)
{
BDRVRawState *s = bs->opaque;
switch(s->type) {
case FTYPE_CD:
if (ioctl (s->fd, CDROM_LOCKDOOR, locked) < 0) {
/* Note: an error can happen if the distribution automatically
mounts the CD-ROM */
// perror("CDROM_LOCKDOOR");
}
break;
default:
return -ENOTSUP;
}
return 0;
}
static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
{
BDRVRawState *s = bs->opaque;
return ioctl(s->fd, req, buf);
}
#ifdef CONFIG_AIO
static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
unsigned long int req, void *buf,
BlockDriverCompletionFunc *cb, void *opaque)
{
BDRVRawState *s = bs->opaque;
RawAIOCB *acb;
if (fd_open(bs) < 0)
return NULL;
acb = qemu_aio_get(bs, cb, opaque);
if (!acb)
return NULL;
acb->aiocb.aio_fildes = s->fd;
acb->aiocb.ev_signo = SIGUSR2;
acb->aiocb.aio_offset = 0;
acb->aiocb.aio_flags = 0;
acb->next = posix_aio_state->first_aio;
posix_aio_state->first_aio = acb;
acb->aiocb.aio_ioctl_buf = buf;
acb->aiocb.aio_ioctl_cmd = req;
if (qemu_paio_ioctl(&acb->aiocb) < 0) {
raw_aio_remove(acb);
return NULL;
}
return &acb->common;
}
#endif
#elif defined(__FreeBSD__)
static int fd_open(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
/* this is just to ensure s->fd is sane (its called by io ops) */
if (s->fd >= 0)
return 0;
return -EIO;
}
static int cd_open(BlockDriverState *bs)
{
#if defined(__FreeBSD__)
BDRVRawState *s = bs->opaque;
int fd;
switch(s->type) {
case FTYPE_CD:
/* XXX force reread of possibly changed/newly loaded disc,
* FreeBSD seems to not notice sometimes... */
if (s->fd >= 0)
close (s->fd);
fd = open(bs->filename, s->cd_open_flags, 0644);
if (fd < 0) {
s->fd = -1;
return -EIO;
}
s->fd = fd;
/* make sure the door isnt locked at this time */
ioctl (s->fd, CDIOCALLOW);
}
#endif
return 0;
}
static int raw_is_inserted(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
switch(s->type) {
case FTYPE_CD:
return (raw_getlength(bs) > 0);
case FTYPE_FD:
/* XXX handle this */
/* FALLTHRU */
default:
return 1;
}
}
static int raw_media_changed(BlockDriverState *bs)
{
return -ENOTSUP;
}
static int raw_eject(BlockDriverState *bs, int eject_flag)
{
BDRVRawState *s = bs->opaque;
switch(s->type) {
case FTYPE_CD:
if (s->fd < 0)
return -ENOTSUP;
(void) ioctl (s->fd, CDIOCALLOW);
if (eject_flag) {
if (ioctl (s->fd, CDIOCEJECT) < 0)
perror("CDIOCEJECT");
} else {
if (ioctl (s->fd, CDIOCCLOSE) < 0)
perror("CDIOCCLOSE");
}
if (cd_open(bs) < 0)
return -ENOTSUP;
break;
case FTYPE_FD:
/* XXX handle this */
/* FALLTHRU */
default:
return -ENOTSUP;
}
return 0;
}
static int raw_set_locked(BlockDriverState *bs, int locked)
{
BDRVRawState *s = bs->opaque;
switch(s->type) {
case FTYPE_CD:
if (s->fd < 0)
return -ENOTSUP;
if (ioctl (s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
/* Note: an error can happen if the distribution automatically
mounts the CD-ROM */
// perror("CDROM_LOCKDOOR");
}
break;
default:
return -ENOTSUP;
}
return 0;
}
static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
{
return -ENOTSUP;
}
#else /* !linux && !FreeBSD */
static int fd_open(BlockDriverState *bs)
{
return 0;
}
static int raw_is_inserted(BlockDriverState *bs)
{
return 1;
}
static int raw_media_changed(BlockDriverState *bs)
{
return -ENOTSUP;
}
static int raw_eject(BlockDriverState *bs, int eject_flag)
{
return -ENOTSUP;
}
static int raw_set_locked(BlockDriverState *bs, int locked)
{
return -ENOTSUP;
}
static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
{
return -ENOTSUP;
}
static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
unsigned long int req, void *buf,
BlockDriverCompletionFunc *cb, void *opaque)
{
return NULL;
}
#endif /* !linux && !FreeBSD */
#if defined(__linux__) || defined(__FreeBSD__)
static int hdev_create(const char *filename, int64_t total_size,
const char *backing_file, int flags)
{
int fd;
int ret = 0;
struct stat stat_buf;
if (flags || backing_file)
return -ENOTSUP;
fd = open(filename, O_WRONLY | O_BINARY);
if (fd < 0)
return -EIO;
if (fstat(fd, &stat_buf) < 0)
ret = -EIO;
else if (!S_ISBLK(stat_buf.st_mode))
ret = -EIO;
else if (lseek(fd, 0, SEEK_END) < total_size * 512)
ret = -ENOSPC;
close(fd);
return ret;
}
#else /* !(linux || freebsd) */
static int hdev_create(const char *filename, int64_t total_size,
const char *backing_file, int flags)
{
return -ENOTSUP;
}
#endif
BlockDriver bdrv_host_device = {
.format_name = "host_device",
.instance_size = sizeof(BDRVRawState),
.bdrv_open = hdev_open,
.bdrv_close = raw_close,
.bdrv_create = hdev_create,
.bdrv_flush = raw_flush,
#ifdef CONFIG_AIO
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_cancel = raw_aio_cancel,
.aiocb_size = sizeof(RawAIOCB),
#endif
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_getlength = raw_getlength,
/* removable device support */
.bdrv_is_inserted = raw_is_inserted,
.bdrv_media_changed = raw_media_changed,
.bdrv_eject = raw_eject,
.bdrv_set_locked = raw_set_locked,
/* generic scsi device */
.bdrv_ioctl = raw_ioctl,
#ifdef CONFIG_AIO
.bdrv_aio_ioctl = raw_aio_ioctl,
#endif
};
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