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qemu-e2k/block-raw.c
bellard 436e15b827 win32 fixes (initial patch by kazu) 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2078 c046a42c-6fe2-441c-8c8c-71466251a162
2006-08-03 09:07:19 +00:00

834 lines
20 KiB
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/*
* Block driver for RAW files
*
* 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 "vl.h"
#include "block_int.h"
#include <assert.h>
#ifndef _WIN32
#include <aio.h>
#ifndef QEMU_TOOL
#include "exec-all.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__
#include <sys/dkio.h>
#endif
typedef struct BDRVRawState {
int fd;
} BDRVRawState;
#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 raw_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVRawState *s = bs->opaque;
int fd, open_flags;
#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;
}
if (flags & BDRV_O_CREAT)
open_flags |= O_CREAT | O_TRUNC;
fd = open(filename, open_flags, 0644);
if (fd < 0)
return -errno;
s->fd = fd;
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
*/
static int raw_pread(BlockDriverState *bs, int64_t offset,
uint8_t *buf, int count)
{
BDRVRawState *s = bs->opaque;
int ret;
lseek(s->fd, offset, SEEK_SET);
ret = read(s->fd, buf, count);
return ret;
}
static int raw_pwrite(BlockDriverState *bs, int64_t offset,
const uint8_t *buf, int count)
{
BDRVRawState *s = bs->opaque;
int ret;
lseek(s->fd, offset, SEEK_SET);
ret = write(s->fd, buf, count);
return ret;
}
/***********************************************************/
/* Unix AOP using POSIX AIO */
typedef struct RawAIOCB {
struct aiocb aiocb;
int busy; /* only used for debugging */
BlockDriverAIOCB *next;
} RawAIOCB;
static int aio_sig_num = SIGUSR2;
static BlockDriverAIOCB *first_aio; /* AIO issued */
static int aio_initialized = 0;
static void aio_signal_handler(int signum)
{
#ifndef QEMU_TOOL
CPUState *env = cpu_single_env;
if (env) {
/* stop the currently executing cpu because a timer occured */
cpu_interrupt(env, CPU_INTERRUPT_EXIT);
#ifdef USE_KQEMU
if (env->kqemu_enabled) {
kqemu_cpu_interrupt(env);
}
#endif
}
#endif
}
void qemu_aio_init(void)
{
struct sigaction act;
aio_initialized = 1;
sigfillset(&act.sa_mask);
act.sa_flags = 0; /* do not restart syscalls to interrupt select() */
act.sa_handler = aio_signal_handler;
sigaction(aio_sig_num, &act, NULL);
{
/* XXX: aio thread exit seems to hang on RH 9 */
struct aioinit ai;
memset(&ai, 0, sizeof(ai));
ai.aio_threads = 2;
ai.aio_num = 1;
ai.aio_idle_time = 365 * 100000;
aio_init(&ai);
}
}
void qemu_aio_poll(void)
{
BlockDriverAIOCB *acb, **pacb;
RawAIOCB *acb1;
int ret;
for(;;) {
pacb = &first_aio;
for(;;) {
acb = *pacb;
if (!acb)
goto the_end;
acb1 = acb->opaque;
ret = aio_error(&acb1->aiocb);
if (ret == ECANCELED) {
/* remove the request */
acb1->busy = 0;
*pacb = acb1->next;
} else if (ret != EINPROGRESS) {
/* end of aio */
if (ret == 0) {
ret = aio_return(&acb1->aiocb);
if (ret == acb1->aiocb.aio_nbytes)
ret = 0;
else
ret = -1;
} else {
ret = -ret;
}
/* remove the request */
acb1->busy = 0;
*pacb = acb1->next;
/* call the callback */
acb->cb(acb->cb_opaque, ret);
break;
} else {
pacb = &acb1->next;
}
}
}
the_end: ;
}
/* wait until at least one AIO was handled */
static sigset_t wait_oset;
void qemu_aio_wait_start(void)
{
sigset_t set;
if (!aio_initialized)
qemu_aio_init();
sigemptyset(&set);
sigaddset(&set, aio_sig_num);
sigprocmask(SIG_BLOCK, &set, &wait_oset);
}
void qemu_aio_wait(void)
{
sigset_t set;
int nb_sigs;
sigemptyset(&set);
sigaddset(&set, aio_sig_num);
sigwait(&set, &nb_sigs);
qemu_aio_poll();
}
void qemu_aio_wait_end(void)
{
sigprocmask(SIG_SETMASK, &wait_oset, NULL);
}
static int raw_aio_new(BlockDriverAIOCB *acb)
{
RawAIOCB *acb1;
BDRVRawState *s = acb->bs->opaque;
acb1 = qemu_mallocz(sizeof(RawAIOCB));
if (!acb1)
return -1;
acb->opaque = acb1;
acb1->aiocb.aio_fildes = s->fd;
acb1->aiocb.aio_sigevent.sigev_signo = aio_sig_num;
acb1->aiocb.aio_sigevent.sigev_notify = SIGEV_SIGNAL;
return 0;
}
static int raw_aio_read(BlockDriverAIOCB *acb, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
RawAIOCB *acb1 = acb->opaque;
assert(acb1->busy == 0);
acb1->busy = 1;
acb1->aiocb.aio_buf = buf;
acb1->aiocb.aio_nbytes = nb_sectors * 512;
acb1->aiocb.aio_offset = sector_num * 512;
acb1->next = first_aio;
first_aio = acb;
if (aio_read(&acb1->aiocb) < 0) {
acb1->busy = 0;
return -errno;
}
return 0;
}
static int raw_aio_write(BlockDriverAIOCB *acb, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
RawAIOCB *acb1 = acb->opaque;
assert(acb1->busy == 0);
acb1->busy = 1;
acb1->aiocb.aio_buf = (uint8_t *)buf;
acb1->aiocb.aio_nbytes = nb_sectors * 512;
acb1->aiocb.aio_offset = sector_num * 512;
acb1->next = first_aio;
first_aio = acb;
if (aio_write(&acb1->aiocb) < 0) {
acb1->busy = 0;
return -errno;
}
return 0;
}
static void raw_aio_cancel(BlockDriverAIOCB *acb)
{
RawAIOCB *acb1 = acb->opaque;
int ret;
BlockDriverAIOCB **pacb;
ret = aio_cancel(acb1->aiocb.aio_fildes, &acb1->aiocb);
if (ret == AIO_NOTCANCELED) {
/* fail safe: if the aio could not be canceled, we wait for
it */
while (aio_error(&acb1->aiocb) == EINPROGRESS);
}
/* remove the callback from the queue */
pacb = &first_aio;
for(;;) {
if (*pacb == NULL) {
break;
} else if (*pacb == acb) {
acb1->busy = 0;
*pacb = acb1->next;
break;
}
acb1 = (*pacb)->opaque;
pacb = &acb1->next;
}
}
static void raw_aio_delete(BlockDriverAIOCB *acb)
{
RawAIOCB *acb1 = acb->opaque;
raw_aio_cancel(acb);
qemu_free(acb1);
}
static void raw_close(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
close(s->fd);
}
static int raw_truncate(BlockDriverState *bs, int64_t offset)
{
BDRVRawState *s = bs->opaque;
if (ftruncate(s->fd, offset) < 0)
return -errno;
return 0;
}
static int64_t raw_getlength(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
int fd = s->fd;
int64_t size;
#ifdef _BSD
struct stat sb;
#endif
#ifdef __sun__
struct dk_minfo minfo;
int rv;
#endif
#ifdef _BSD
if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
#ifdef DIOCGMEDIASIZE
if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
#endif
#ifdef CONFIG_COCOA
size = LONG_LONG_MAX;
#else
size = lseek(fd, 0LL, SEEK_END);
#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);
}
#ifdef _WIN32
/* On Windows hosts it can happen that we're unable to get file size
for CD-ROM raw device (it's inherent limitation of the CDFS driver). */
if (size == -1)
size = LONG_LONG_MAX;
#endif
return size;
}
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 | O_LARGEFILE,
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 = {
"raw",
sizeof(BDRVRawState),
NULL, /* no probe for protocols */
raw_open,
NULL,
NULL,
raw_close,
raw_create,
raw_flush,
.bdrv_aio_new = raw_aio_new,
.bdrv_aio_read = raw_aio_read,
.bdrv_aio_write = raw_aio_write,
.bdrv_aio_cancel = raw_aio_cancel,
.bdrv_aio_delete = raw_aio_delete,
.protocol_name = "file",
.bdrv_pread = raw_pread,
.bdrv_pwrite = raw_pwrite,
.bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
};
#else /* _WIN32 */
/* XXX: use another file ? */
#include <winioctl.h>
typedef struct BDRVRawState {
HANDLE hfile;
} BDRVRawState;
typedef struct RawAIOCB {
HANDLE hEvent;
OVERLAPPED ov;
int count;
} RawAIOCB;
int qemu_ftruncate64(int fd, int64_t length)
{
LARGE_INTEGER li;
LONG high;
HANDLE h;
BOOL res;
if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
return -1;
h = (HANDLE)_get_osfhandle(fd);
/* get current position, ftruncate do not change position */
li.HighPart = 0;
li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
if (li.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
return -1;
high = length >> 32;
if (!SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN))
return -1;
res = SetEndOfFile(h);
/* back to old position */
SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
return res ? 0 : -1;
}
static int set_sparse(int fd)
{
DWORD returned;
return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
NULL, 0, NULL, 0, &returned, NULL);
}
static int raw_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVRawState *s = bs->opaque;
int access_flags, create_flags;
if ((flags & BDRV_O_ACCESS) == O_RDWR) {
access_flags = GENERIC_READ | GENERIC_WRITE;
} else {
access_flags = GENERIC_READ;
}
if (flags & BDRV_O_CREAT) {
create_flags = CREATE_ALWAYS;
} else {
create_flags = OPEN_EXISTING;
}
s->hfile = CreateFile(filename, access_flags,
FILE_SHARE_READ, NULL,
create_flags, FILE_FLAG_OVERLAPPED, 0);
if (s->hfile == INVALID_HANDLE_VALUE)
return -1;
return 0;
}
static int raw_pread(BlockDriverState *bs, int64_t offset,
uint8_t *buf, int count)
{
BDRVRawState *s = bs->opaque;
OVERLAPPED ov;
DWORD ret_count;
int ret;
memset(&ov, 0, sizeof(ov));
ov.Offset = offset;
ov.OffsetHigh = offset >> 32;
ret = ReadFile(s->hfile, buf, count, &ret_count, &ov);
if (!ret) {
ret = GetOverlappedResult(s->hfile, &ov, &ret_count, TRUE);
if (!ret)
return -EIO;
else
return ret_count;
}
return ret_count;
}
static int raw_pwrite(BlockDriverState *bs, int64_t offset,
const uint8_t *buf, int count)
{
BDRVRawState *s = bs->opaque;
OVERLAPPED ov;
DWORD ret_count;
int ret;
memset(&ov, 0, sizeof(ov));
ov.Offset = offset;
ov.OffsetHigh = offset >> 32;
ret = WriteFile(s->hfile, buf, count, &ret_count, &ov);
if (!ret) {
ret = GetOverlappedResult(s->hfile, &ov, &ret_count, TRUE);
if (!ret)
return -EIO;
else
return ret_count;
}
return ret_count;
}
static int raw_aio_new(BlockDriverAIOCB *acb)
{
RawAIOCB *acb1;
acb1 = qemu_mallocz(sizeof(RawAIOCB));
if (!acb1)
return -ENOMEM;
acb->opaque = acb1;
acb1->hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (!acb1->hEvent)
return -ENOMEM;
return 0;
}
#ifndef QEMU_TOOL
static void raw_aio_cb(void *opaque)
{
BlockDriverAIOCB *acb = opaque;
BlockDriverState *bs = acb->bs;
BDRVRawState *s = bs->opaque;
RawAIOCB *acb1 = acb->opaque;
DWORD ret_count;
int ret;
ret = GetOverlappedResult(s->hfile, &acb1->ov, &ret_count, TRUE);
if (!ret || ret_count != acb1->count) {
acb->cb(acb->cb_opaque, -EIO);
} else {
acb->cb(acb->cb_opaque, 0);
}
}
#endif
static int raw_aio_read(BlockDriverAIOCB *acb, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
BlockDriverState *bs = acb->bs;
BDRVRawState *s = bs->opaque;
RawAIOCB *acb1 = acb->opaque;
int ret;
int64_t offset;
memset(&acb1->ov, 0, sizeof(acb1->ov));
offset = sector_num * 512;
acb1->ov.Offset = offset;
acb1->ov.OffsetHigh = offset >> 32;
acb1->ov.hEvent = acb1->hEvent;
acb1->count = nb_sectors * 512;
#ifndef QEMU_TOOL
qemu_add_wait_object(acb1->ov.hEvent, raw_aio_cb, acb);
#endif
ret = ReadFile(s->hfile, buf, acb1->count, NULL, &acb1->ov);
if (!ret)
return -EIO;
return 0;
}
static int raw_aio_write(BlockDriverAIOCB *acb, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
BlockDriverState *bs = acb->bs;
BDRVRawState *s = bs->opaque;
RawAIOCB *acb1 = acb->opaque;
int ret;
int64_t offset;
memset(&acb1->ov, 0, sizeof(acb1->ov));
offset = sector_num * 512;
acb1->ov.Offset = offset;
acb1->ov.OffsetHigh = offset >> 32;
acb1->ov.hEvent = acb1->hEvent;
acb1->count = nb_sectors * 512;
#ifndef QEMU_TOOL
qemu_add_wait_object(acb1->ov.hEvent, raw_aio_cb, acb);
#endif
ret = ReadFile(s->hfile, buf, acb1->count, NULL, &acb1->ov);
if (!ret)
return -EIO;
return 0;
}
static void raw_aio_cancel(BlockDriverAIOCB *acb)
{
BlockDriverState *bs = acb->bs;
BDRVRawState *s = bs->opaque;
#ifndef QEMU_TOOL
RawAIOCB *acb1 = acb->opaque;
qemu_del_wait_object(acb1->ov.hEvent, raw_aio_cb, acb);
#endif
/* XXX: if more than one async I/O it is not correct */
CancelIo(s->hfile);
}
static void raw_aio_delete(BlockDriverAIOCB *acb)
{
RawAIOCB *acb1 = acb->opaque;
raw_aio_cancel(acb);
CloseHandle(acb1->hEvent);
qemu_free(acb1);
}
static void raw_flush(BlockDriverState *bs)
{
/* XXX: add it */
}
static void raw_close(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
CloseHandle(s->hfile);
}
static int raw_truncate(BlockDriverState *bs, int64_t offset)
{
BDRVRawState *s = bs->opaque;
DWORD low, high;
low = offset;
high = offset >> 32;
if (!SetFilePointer(s->hfile, low, &high, FILE_BEGIN))
return -EIO;
if (!SetEndOfFile(s->hfile))
return -EIO;
return 0;
}
static int64_t raw_getlength(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
LARGE_INTEGER l;
l.LowPart = GetFileSize(s->hfile, &l.HighPart);
if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
return -EIO;
return l.QuadPart;
}
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;
set_sparse(fd);
ftruncate(fd, total_size * 512);
close(fd);
return 0;
}
void qemu_aio_init(void)
{
}
void qemu_aio_poll(void)
{
}
void qemu_aio_wait_start(void)
{
}
void qemu_aio_wait(void)
{
}
void qemu_aio_wait_end(void)
{
}
BlockDriver bdrv_raw = {
"raw",
sizeof(BDRVRawState),
NULL, /* no probe for protocols */
raw_open,
NULL,
NULL,
raw_close,
raw_create,
raw_flush,
#if 0
.bdrv_aio_new = raw_aio_new,
.bdrv_aio_read = raw_aio_read,
.bdrv_aio_write = raw_aio_write,
.bdrv_aio_cancel = raw_aio_cancel,
.bdrv_aio_delete = raw_aio_delete,
#endif
.protocol_name = "file",
.bdrv_pread = raw_pread,
.bdrv_pwrite = raw_pwrite,
.bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
};
#endif /* _WIN32 */
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