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authorbellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162>2006-08-01 16:21:11 +0000
committerbellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162>2006-08-01 16:21:11 +0000
commit83f6409109acd7cd13ff8a603f29c46033c4fb00 (patch)
treee06b75a308f58785b6c646d192e8e53fda006e20 /block.c
parent7954c73498b7e782ba5db2993637daef456b6310 (diff)
async file I/O API
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2075 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'block.c')
-rw-r--r--block.c885
1 files changed, 569 insertions, 316 deletions
diff --git a/block.c b/block.c
index ceb0532bd0..3cf8b7b123 100644
--- a/block.c
+++ b/block.c
@@ -32,85 +32,92 @@
#include <sys/disk.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
+#define SECTOR_BITS 9
+#define SECTOR_SIZE (1 << SECTOR_BITS)
+
+static int bdrv_aio_new_em(BlockDriverAIOCB *acb);
+static int bdrv_aio_read_em(BlockDriverAIOCB *acb, int64_t sector_num,
+ uint8_t *buf, int nb_sectors);
+static int bdrv_aio_write_em(BlockDriverAIOCB *acb, int64_t sector_num,
+ const uint8_t *buf, int nb_sectors);
+static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
+static void bdrv_aio_delete_em(BlockDriverAIOCB *acb);
+static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
+ uint8_t *buf, int nb_sectors);
+static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
+ const uint8_t *buf, int nb_sectors);
static BlockDriverState *bdrv_first;
static BlockDriver *first_drv;
-#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 );
+#ifdef _WIN32
+#define PATH_SEP '\\'
+#else
+#define PATH_SEP '/'
+#endif
-kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
+int path_is_absolute(const char *path)
{
- 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;
+ const char *p;
+ p = strchr(path, ':');
+ if (p)
+ p++;
+ else
+ p = path;
+ return (*p == PATH_SEP);
}
-kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
+/* if filename is absolute, just copy it to dest. Otherwise, build a
+ path to it by considering it is relative to base_path. URL are
+ supported. */
+void path_combine(char *dest, int dest_size,
+ const char *base_path,
+ const char *filename)
{
- 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 );
+ const char *p, *p1;
+ int len;
+
+ if (dest_size <= 0)
+ return;
+ if (path_is_absolute(filename)) {
+ pstrcpy(dest, dest_size, filename);
+ } else {
+ p = strchr(base_path, ':');
+ if (p)
+ p++;
+ else
+ p = base_path;
+ p1 = strrchr(base_path, PATH_SEP);
+ if (p1)
+ p1++;
+ else
+ p1 = base_path;
+ if (p1 > p)
+ p = p1;
+ len = p - base_path;
+ if (len > dest_size - 1)
+ len = dest_size - 1;
+ memcpy(dest, base_path, len);
+ dest[len] = '\0';
+ pstrcat(dest, dest_size, filename);
}
-
- return kernResult;
}
-#endif
void bdrv_register(BlockDriver *bdrv)
{
+ if (!bdrv->bdrv_aio_new) {
+ /* add AIO emulation layer */
+ bdrv->bdrv_aio_new = bdrv_aio_new_em;
+ bdrv->bdrv_aio_read = bdrv_aio_read_em;
+ bdrv->bdrv_aio_write = bdrv_aio_write_em;
+ bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em;
+ bdrv->bdrv_aio_delete = bdrv_aio_delete_em;
+ } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) {
+ /* add synchronous IO emulation layer */
+ bdrv->bdrv_read = bdrv_read_em;
+ bdrv->bdrv_write = bdrv_write_em;
+ }
bdrv->next = first_drv;
first_drv = bdrv;
}
@@ -156,14 +163,7 @@ int bdrv_create(BlockDriver *drv,
#ifdef _WIN32
void get_tmp_filename(char *filename, int size)
{
- char* p = strrchr(filename, '/');
-
- if (p == NULL)
- return;
-
- /* XXX: find a better function */
- tmpnam(p);
- *p = '/';
+ tmpnam(filename);
}
#else
void get_tmp_filename(char *filename, int size)
@@ -176,101 +176,107 @@ void get_tmp_filename(char *filename, int size)
}
#endif
+static BlockDriver *find_protocol(const char *filename)
+{
+ BlockDriver *drv1;
+ char protocol[128];
+ int len;
+ const char *p;
+ p = strchr(filename, ':');
+ if (!p)
+ return &bdrv_raw;
+ len = p - filename;
+ if (len > sizeof(protocol) - 1)
+ len = sizeof(protocol) - 1;
+#ifdef _WIN32
+ if (len == 1) {
+ /* specific win32 case for driver letters */
+ return &bdrv_raw;
+ }
+#endif
+ memcpy(protocol, filename, len);
+ protocol[len] = '\0';
+ for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
+ if (drv1->protocol_name &&
+ !strcmp(drv1->protocol_name, protocol))
+ return drv1;
+ }
+ return NULL;
+}
+
/* XXX: force raw format if block or character device ? It would
simplify the BSD case */
static BlockDriver *find_image_format(const char *filename)
{
- int fd, ret, score, score_max;
+ int ret, score, score_max;
BlockDriver *drv1, *drv;
- uint8_t *buf;
- size_t bufsize = 1024;
-
- fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
- if (fd < 0) {
- buf = NULL;
- ret = 0;
- } else {
-#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
- buf = qemu_malloc(bufsize);
- if (!buf)
- return NULL;
- ret = read(fd, buf, bufsize);
- if (ret < 0) {
- close(fd);
- qemu_free(buf);
- return NULL;
- }
- close(fd);
- }
+ uint8_t buf[2048];
+ BlockDriverState *bs;
- drv = NULL;
+ drv = find_protocol(filename);
+ /* no need to test disk image formats for vvfat or host specific
+ devices */
+ if (drv == &bdrv_vvfat)
+ return drv;
+ if (strstart(filename, "/dev/", NULL))
+ return &bdrv_raw;
+
+ ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
+ if (ret < 0)
+ return NULL;
+ ret = bdrv_pread(bs, 0, buf, sizeof(buf));
+ bdrv_delete(bs);
+ if (ret < 0) {
+ return NULL;
+ }
+
score_max = 0;
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
- score = drv1->bdrv_probe(buf, ret, filename);
- if (score > score_max) {
- score_max = score;
- drv = drv1;
+ if (drv1->bdrv_probe) {
+ score = drv1->bdrv_probe(buf, ret, filename);
+ if (score > score_max) {
+ score_max = score;
+ drv = drv1;
+ }
}
}
- qemu_free(buf);
return drv;
}
-int bdrv_open(BlockDriverState *bs, const char *filename, int snapshot)
+int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
{
-#ifdef CONFIG_COCOA
- if ( strncmp( filename, "/dev/cdrom", 10 ) == 0 ) {
- 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 );
+ BlockDriverState *bs;
+ int ret;
+
+ bs = bdrv_new("");
+ if (!bs)
+ return -ENOMEM;
+ ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
+ if (ret < 0) {
+ bdrv_delete(bs);
+ return ret;
}
-#endif
- return bdrv_open2(bs, filename, snapshot, NULL);
+ *pbs = bs;
+ return 0;
+}
+
+int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
+{
+ return bdrv_open2(bs, filename, flags, NULL);
}
-int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot,
+int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
BlockDriver *drv)
{
- int ret;
+ int ret, open_flags;
char tmp_filename[1024];
+ char backing_filename[1024];
bs->read_only = 0;
bs->is_temporary = 0;
bs->encrypted = 0;
- if (snapshot) {
+ if (flags & BDRV_O_SNAPSHOT) {
BlockDriverState *bs1;
int64_t total_size;
@@ -280,17 +286,16 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot,
/* if there is a backing file, use it */
bs1 = bdrv_new("");
if (!bs1) {
- return -1;
+ return -ENOMEM;
}
if (bdrv_open(bs1, filename, 0) < 0) {
bdrv_delete(bs1);
return -1;
}
- total_size = bs1->total_sectors;
+ total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
bdrv_delete(bs1);
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
- /* XXX: use cow for linux as it is more efficient ? */
if (bdrv_create(&bdrv_qcow, tmp_filename,
total_size, filename, 0) < 0) {
return -1;
@@ -300,27 +305,43 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot,
}
pstrcpy(bs->filename, sizeof(bs->filename), filename);
- if (!drv) {
- drv = find_image_format(filename);
+ if (flags & BDRV_O_FILE) {
+ drv = find_protocol(filename);
if (!drv)
- return -1;
+ return -ENOENT;
+ } else {
+ if (!drv) {
+ drv = find_image_format(filename);
+ if (!drv)
+ return -1;
+ }
}
bs->drv = drv;
bs->opaque = qemu_mallocz(drv->instance_size);
if (bs->opaque == NULL && drv->instance_size > 0)
return -1;
-
- ret = drv->bdrv_open(bs, filename);
+ /* Note: for compatibility, we open disk image files as RDWR, and
+ RDONLY as fallback */
+ if (!(flags & BDRV_O_FILE))
+ open_flags = BDRV_O_RDWR;
+ else
+ open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
+ ret = drv->bdrv_open(bs, filename, open_flags);
+ if (ret == -EACCES && !(flags & BDRV_O_FILE)) {
+ ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY);
+ bs->read_only = 1;
+ }
if (ret < 0) {
qemu_free(bs->opaque);
- return -1;
+ return ret;
}
+
#ifndef _WIN32
if (bs->is_temporary) {
unlink(filename);
}
#endif
- if (bs->backing_file[0] != '\0' && drv->bdrv_is_allocated) {
+ if (bs->backing_file[0] != '\0') {
/* if there is a backing file, use it */
bs->backing_hd = bdrv_new("");
if (!bs->backing_hd) {
@@ -328,7 +349,9 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot,
bdrv_close(bs);
return -1;
}
- if (bdrv_open(bs->backing_hd, bs->backing_file, 0) < 0)
+ path_combine(backing_filename, sizeof(backing_filename),
+ filename, bs->backing_file);
+ if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0)
goto fail;
}
@@ -373,7 +396,7 @@ void bdrv_delete(BlockDriverState *bs)
/* commit COW file into the raw image */
int bdrv_commit(BlockDriverState *bs)
{
- int64_t i;
+ int64_t i, total_sectors;
int n, j;
unsigned char sector[512];
@@ -388,7 +411,8 @@ int bdrv_commit(BlockDriverState *bs)
return -ENOTSUP;
}
- for (i = 0; i < bs->total_sectors;) {
+ total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
+ for (i = 0; i < total_sectors;) {
if (bs->drv->bdrv_is_allocated(bs, i, 65536, &n)) {
for(j = 0; j < n; j++) {
if (bdrv_read(bs, i, sector, 1) != 0) {
@@ -411,49 +435,43 @@ int bdrv_commit(BlockDriverState *bs)
return 0;
}
-/* return -1 if error */
+/* return < 0 if error */
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
- int ret, n;
BlockDriver *drv = bs->drv;
if (!bs->inserted)
return -1;
- while (nb_sectors > 0) {
- if (sector_num == 0 && bs->boot_sector_enabled) {
+ if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
memcpy(buf, bs->boot_sector_data, 512);
- n = 1;
- } else if (bs->backing_hd) {
- if (drv->bdrv_is_allocated(bs, sector_num, nb_sectors, &n)) {
- ret = drv->bdrv_read(bs, sector_num, buf, n);
- if (ret < 0)
- return -1;
- } else {
- /* read from the base image */
- ret = bdrv_read(bs->backing_hd, sector_num, buf, n);
- if (ret < 0)
- return -1;
- }
- } else {
- ret = drv->bdrv_read(bs, sector_num, buf, nb_sectors);
- if (ret < 0)
- return -1;
- /* no need to loop */
- break;
- }
- nb_sectors -= n;
- sector_num += n;
- buf += n * 512;
+ sector_num++;
+ nb_sectors--;
+ buf += 512;
+ if (nb_sectors == 0)
+ return 0;
+ }
+ if (drv->bdrv_pread) {
+ int ret, len;
+ len = nb_sectors * 512;
+ ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
+ if (ret < 0)
+ return ret;
+ else if (ret != len)
+ return -EIO;
+ else
+ return 0;
+ } else {
+ return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
}
- return 0;
}
-/* return -1 if error */
+/* return < 0 if error */
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
+ BlockDriver *drv = bs->drv;
if (!bs->inserted)
return -1;
if (bs->read_only)
@@ -461,12 +479,183 @@ int bdrv_write(BlockDriverState *bs, int64_t sector_num,
if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
memcpy(bs->boot_sector_data, buf, 512);
}
- return bs->drv->bdrv_write(bs, sector_num, buf, nb_sectors);
+ if (drv->bdrv_pwrite) {
+ int ret, len;
+ len = nb_sectors * 512;
+ ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len);
+ if (ret < 0)
+ return ret;
+ else if (ret != len)
+ return -EIO;
+ else
+ return 0;
+ } else {
+ return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
+ }
+}
+
+#if 0
+/* not necessary now */
+static int bdrv_pread_em(BlockDriverState *bs, int64_t offset,
+ void *buf1, int count1)
+{
+ uint8_t *buf = buf1;
+ uint8_t tmp_buf[SECTOR_SIZE];
+ int len, nb_sectors, count;
+ int64_t sector_num;
+
+ count = count1;
+ /* first read to align to sector start */
+ len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
+ if (len > count)
+ len = count;
+ sector_num = offset >> SECTOR_BITS;
+ if (len > 0) {
+ if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
+ return -EIO;
+ memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
+ count -= len;
+ if (count == 0)
+ return count1;
+ sector_num++;
+ buf += len;
+ }
+
+ /* read the sectors "in place" */
+ nb_sectors = count >> SECTOR_BITS;
+ if (nb_sectors > 0) {
+ if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
+ return -EIO;
+ sector_num += nb_sectors;
+ len = nb_sectors << SECTOR_BITS;
+ buf += len;
+ count -= len;
+ }
+
+ /* add data from the last sector */
+ if (count > 0) {
+ if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
+ return -EIO;
+ memcpy(buf, tmp_buf, count);
+ }
+ return count1;
+}
+
+static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset,
+ const void *buf1, int count1)
+{
+ const uint8_t *buf = buf1;
+ uint8_t tmp_buf[SECTOR_SIZE];
+ int len, nb_sectors, count;
+ int64_t sector_num;
+
+ count = count1;
+ /* first write to align to sector start */
+ len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
+ if (len > count)
+ len = count;
+ sector_num = offset >> SECTOR_BITS;
+ if (len > 0) {
+ if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
+ return -EIO;
+ memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
+ if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
+ return -EIO;
+ count -= len;
+ if (count == 0)
+ return count1;
+ sector_num++;
+ buf += len;
+ }
+
+ /* write the sectors "in place" */
+ nb_sectors = count >> SECTOR_BITS;
+ if (nb_sectors > 0) {
+ if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
+ return -EIO;
+ sector_num += nb_sectors;
+ len = nb_sectors << SECTOR_BITS;
+ buf += len;
+ count -= len;
+ }
+
+ /* add data from the last sector */
+ if (count > 0) {
+ if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
+ return -EIO;
+ memcpy(tmp_buf, buf, count);
+ if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
+ return -EIO;
+ }
+ return count1;
+}
+#endif
+
+/**
+ * Read with byte offsets (needed only for file protocols)
+ */
+int bdrv_pread(BlockDriverState *bs, int64_t offset,
+ void *buf1, int count1)
+{
+ BlockDriver *drv = bs->drv;
+
+ if (!drv)
+ return -ENOENT;
+ if (!drv->bdrv_pread)
+ return -ENOTSUP;
+ return drv->bdrv_pread(bs, offset, buf1, count1);
+}
+
+/**
+ * Write with byte offsets (needed only for file protocols)
+ */
+int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
+ const void *buf1, int count1)
+{
+ BlockDriver *drv = bs->drv;
+
+ if (!drv)
+ return -ENOENT;
+ if (!drv->bdrv_pwrite)
+ return -ENOTSUP;
+ return drv->bdrv_pwrite(bs, offset, buf1, count1);
+}
+
+/**
+ * Truncate file to 'offset' bytes (needed only for file protocols)
+ */
+int bdrv_truncate(BlockDriverState *bs, int64_t offset)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv)
+ return -ENOENT;
+ if (!drv->bdrv_truncate)
+ return -ENOTSUP;
+ return drv->bdrv_truncate(bs, offset);
+}
+
+/**
+ * Length of a file in bytes. Return < 0 if error or unknown.
+ */
+int64_t bdrv_getlength(BlockDriverState *bs)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv)
+ return -ENOENT;
+ if (!drv->bdrv_getlength) {
+ /* legacy mode */
+ return bs->total_sectors * SECTOR_SIZE;
+ }
+ return drv->bdrv_getlength(bs);
}
void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr)
{
- *nb_sectors_ptr = bs->total_sectors;
+ int64_t size;
+ size = bdrv_getlength(bs);
+ if (size < 0)
+ size = 0;
+ *nb_sectors_ptr = size >> SECTOR_BITS;
}
/* force a given boot sector. */
@@ -660,187 +849,251 @@ void bdrv_info(void)
}
}
+void bdrv_get_backing_filename(BlockDriverState *bs,
+ char *filename, int filename_size)
+{
+ if (!bs->backing_hd) {
+ pstrcpy(filename, filename_size, "");
+ } else {
+ pstrcpy(filename, filename_size, bs->backing_file);
+ }
+}
+
+
/**************************************************************/
-/* RAW block driver */
+/* async I/Os */
-typedef struct BDRVRawState {
- int fd;
-} BDRVRawState;
+BlockDriverAIOCB *bdrv_aio_new(BlockDriverState *bs)
+{
+ BlockDriver *drv = bs->drv;
+ BlockDriverAIOCB *acb;
+ acb = qemu_mallocz(sizeof(BlockDriverAIOCB));
+ if (!acb)
+ return NULL;
+
+ acb->bs = bs;
+ if (drv->bdrv_aio_new(acb) < 0) {
+ qemu_free(acb);
+ return NULL;
+ }
+ return acb;
+}
-static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)
+int bdrv_aio_read(BlockDriverAIOCB *acb, int64_t sector_num,
+ uint8_t *buf, int nb_sectors,
+ BlockDriverCompletionFunc *cb, void *opaque)
{
- return 1; /* maybe */
+ BlockDriverState *bs = acb->bs;
+ BlockDriver *drv = bs->drv;
+
+ if (!bs->inserted)
+ return -1;
+
+ /* XXX: we assume that nb_sectors == 0 is suppored by the async read */
+ if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
+ memcpy(buf, bs->boot_sector_data, 512);
+ sector_num++;
+ nb_sectors--;
+ buf += 512;
+ }
+
+ acb->cb = cb;
+ acb->cb_opaque = opaque;
+ return drv->bdrv_aio_read(acb, sector_num, buf, nb_sectors);
}
-static int raw_open(BlockDriverState *bs, const char *filename)
+int bdrv_aio_write(BlockDriverAIOCB *acb, int64_t sector_num,
+ const uint8_t *buf, int nb_sectors,
+ BlockDriverCompletionFunc *cb, void *opaque)
{
- BDRVRawState *s = bs->opaque;
- int fd;
- int64_t size;
-#ifdef _BSD
- struct stat sb;
-#endif
-#ifdef __sun__
- struct dk_minfo minfo;
- int rv;
-#endif
+ BlockDriverState *bs = acb->bs;
+ BlockDriver *drv = bs->drv;
- fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE);
- if (fd < 0) {
- fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
- if (fd < 0)
+ if (!bs->inserted)
return -1;
- bs->read_only = 1;
+ if (bs->read_only)
+ return -1;
+ if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
+ memcpy(bs->boot_sector_data, buf, 512);
}
-#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
+
+ acb->cb = cb;
+ acb->cb_opaque = opaque;
+ return drv->bdrv_aio_write(acb, sector_num, buf, nb_sectors);
+}
+
+void bdrv_aio_cancel(BlockDriverAIOCB *acb)
{
- size = lseek(fd, 0, SEEK_END);
+ BlockDriverState *bs = acb->bs;
+ BlockDriver *drv = bs->drv;
+
+ drv->bdrv_aio_cancel(acb);
}
-#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
- bs->total_sectors = size / 512;
- s->fd = fd;
+
+void bdrv_aio_delete(BlockDriverAIOCB *acb)
+{
+ BlockDriverState *bs = acb->bs;
+ BlockDriver *drv = bs->drv;
+
+ drv->bdrv_aio_delete(acb);
+ qemu_free(acb);
+}
+
+/**************************************************************/
+/* async block device emulation */
+
+#ifdef QEMU_TOOL
+static int bdrv_aio_new_em(BlockDriverAIOCB *acb)
+{
return 0;
}
-static int raw_read(BlockDriverState *bs, int64_t sector_num,
+static int bdrv_aio_read_em(BlockDriverAIOCB *acb, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
- BDRVRawState *s = bs->opaque;
int ret;
-
- lseek(s->fd, sector_num * 512, SEEK_SET);
- ret = read(s->fd, buf, nb_sectors * 512);
- if (ret != nb_sectors * 512)
- return -1;
+ ret = bdrv_read(acb->bs, sector_num, buf, nb_sectors);
+ acb->cb(acb->cb_opaque, ret);
return 0;
}
-static int raw_write(BlockDriverState *bs, int64_t sector_num,
+static int bdrv_aio_write_em(BlockDriverAIOCB *acb, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
- BDRVRawState *s = bs->opaque;
int ret;
-
- lseek(s->fd, sector_num * 512, SEEK_SET);
- ret = write(s->fd, buf, nb_sectors * 512);
- if (ret != nb_sectors * 512)
- return -1;
+ ret = bdrv_write(acb->bs, sector_num, buf, nb_sectors);
+ acb->cb(acb->cb_opaque, ret);
return 0;
}
-static void raw_close(BlockDriverState *bs)
+static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb)
{
- BDRVRawState *s = bs->opaque;
- close(s->fd);
}
-#ifdef _WIN32
-#include <windows.h>
-#include <winioctl.h>
-
-int qemu_ftruncate64(int fd, int64_t length)
+static void bdrv_aio_delete_em(BlockDriverAIOCB *acb)
{
- LARGE_INTEGER li;
- LONG high;
- HANDLE h;
- BOOL res;
-
- if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
- return -1;
+}
+#else
+typedef struct BlockDriverAIOCBSync {
+ QEMUBH *bh;
+ int ret;
+} BlockDriverAIOCBSync;
- h = (HANDLE)_get_osfhandle(fd);
+static void bdrv_aio_bh_cb(void *opaque)
+{
+ BlockDriverAIOCB *acb = opaque;
+ BlockDriverAIOCBSync *acb1 = acb->opaque;
+ acb->cb(acb->cb_opaque, acb1->ret);
+}
- /* 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;
+static int bdrv_aio_new_em(BlockDriverAIOCB *acb)
+{
+ BlockDriverAIOCBSync *acb1;
- high = length >> 32;
- if (!SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN))
- return -1;
- res = SetEndOfFile(h);
+ acb1 = qemu_mallocz(sizeof(BlockDriverAIOCBSync));
+ if (!acb1)
+ return -1;
+ acb->opaque = acb1;
+ acb1->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
+ return 0;
+}
- /* back to old position */
- SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
- return res ? 0 : -1;
+static int bdrv_aio_read_em(BlockDriverAIOCB *acb, int64_t sector_num,
+ uint8_t *buf, int nb_sectors)
+{
+ BlockDriverAIOCBSync *acb1 = acb->opaque;
+ int ret;
+
+ ret = bdrv_read(acb->bs, sector_num, buf, nb_sectors);
+ acb1->ret = ret;
+ qemu_bh_schedule(acb1->bh);
+ return 0;
}
-static int set_sparse(int fd)
+static int bdrv_aio_write_em(BlockDriverAIOCB *acb, int64_t sector_num,
+ const uint8_t *buf, int nb_sectors)
{
- DWORD returned;
- return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
- NULL, 0, NULL, 0, &returned, NULL);
+ BlockDriverAIOCBSync *acb1 = acb->opaque;
+ int ret;
+
+ ret = bdrv_write(acb->bs, sector_num, buf, nb_sectors);
+ acb1->ret = ret;
+ qemu_bh_schedule(acb1->bh);
+ return 0;
}
-#else
-static inline int set_sparse(int fd)
+
+static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb)
{
- return 1;
+ BlockDriverAIOCBSync *acb1 = acb->opaque;
+ qemu_bh_cancel(acb1->bh);
}
-#endif
-static int raw_create(const char *filename, int64_t total_size,
- const char *backing_file, int flags)
+static void bdrv_aio_delete_em(BlockDriverAIOCB *acb)
{
- int fd;
+ BlockDriverAIOCBSync *acb1 = acb->opaque;
+ qemu_bh_delete(acb1->bh);
+}
+#endif /* !QEMU_TOOL */
- if (flags || backing_file)
- return -ENOTSUP;
+/**************************************************************/
+/* sync block device emulation */
- fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
- 0644);
- if (fd < 0)
- return -EIO;
- set_sparse(fd);
- ftruncate(fd, total_size * 512);
- close(fd);
- return 0;
+static void bdrv_rw_em_cb(void *opaque, int ret)
+{
+ *(int *)opaque = ret;
}
-static void raw_flush(BlockDriverState *bs)
+#define NOT_DONE 0x7fffffff
+
+static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
+ uint8_t *buf, int nb_sectors)
{
- BDRVRawState *s = bs->opaque;
- fsync(s->fd);
+ int async_ret, ret;
+
+ if (!bs->sync_aiocb) {
+ bs->sync_aiocb = bdrv_aio_new(bs);
+ if (!bs->sync_aiocb)
+ return -1;
+ }
+ async_ret = NOT_DONE;
+ qemu_aio_wait_start();
+ ret = bdrv_aio_read(bs->sync_aiocb, sector_num, buf, nb_sectors,
+ bdrv_rw_em_cb, &async_ret);
+ if (ret < 0) {
+ qemu_aio_wait_end();
+ return ret;
+ }
+ while (async_ret == NOT_DONE) {
+ qemu_aio_wait();
+ }
+ qemu_aio_wait_end();
+ return async_ret;
}
-BlockDriver bdrv_raw = {
- "raw",
- sizeof(BDRVRawState),
- raw_probe,
- raw_open,
- raw_read,
- raw_write,
- raw_close,
- raw_create,
- raw_flush,
-};
+static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
+ const uint8_t *buf, int nb_sectors)
+{
+ int async_ret, ret;
+
+ if (!bs->sync_aiocb) {
+ bs->sync_aiocb = bdrv_aio_new(bs);
+ if (!bs->sync_aiocb)
+ return -1;
+ }
+ async_ret = NOT_DONE;
+ qemu_aio_wait_start();
+ ret = bdrv_aio_write(bs->sync_aiocb, sector_num, buf, nb_sectors,
+ bdrv_rw_em_cb, &async_ret);
+ if (ret < 0) {
+ qemu_aio_wait_end();
+ return ret;
+ }
+ while (async_ret == NOT_DONE) {
+ qemu_aio_wait();
+ }
+ qemu_aio_wait_end();
+ return async_ret;
+}
void bdrv_init(void)
{