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Merge remote branch 'kwolf/for-anthony' into HEAD

This commit is contained in:
Anthony Liguori 2010-05-03 07:31:51 -05:00
parent a6dac6a9ab d748768c09
commit 72375c2290
28 changed files with 848 additions and 499 deletions
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2
Makefile.objs
View File

@ -12,7 +12,7 @@ block-obj-y += nbd.o block.o aio.o aes.o osdep.o qemu-config.o
block-obj-$(CONFIG_POSIX) += posix-aio-compat.o
block-obj-$(CONFIG_LINUX_AIO) += linux-aio.o
block-nested-y += cow.o qcow.o vdi.o vmdk.o cloop.o dmg.o bochs.o vpc.o vvfat.o
block-nested-y += raw.o cow.o qcow.o vdi.o vmdk.o cloop.o dmg.o bochs.o vpc.o vvfat.o
block-nested-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o
block-nested-y += parallels.o nbd.o blkdebug.o
block-nested-$(CONFIG_WIN32) += raw-win32.o

394
block.c
View File

@ -54,6 +54,7 @@ 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 BlockDriver *find_protocol(const char *filename);
static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
QTAILQ_HEAD_INITIALIZER(bdrv_states);
@ -203,6 +204,18 @@ int bdrv_create(BlockDriver *drv, const char* filename,
return drv->bdrv_create(filename, options);
}
int bdrv_create_file(const char* filename, QEMUOptionParameter *options)
{
BlockDriver *drv;
drv = find_protocol(filename);
if (drv == NULL) {
drv = bdrv_find_format("file");
}
return bdrv_create(drv, filename, options);
}
#ifdef _WIN32
void get_tmp_filename(char *filename, int size)
{
@ -246,35 +259,6 @@ int is_windows_drive(const char *filename)
}
#endif
static BlockDriver *find_protocol(const char *filename)
{
BlockDriver *drv1;
char protocol[128];
int len;
const char *p;
#ifdef _WIN32
if (is_windows_drive(filename) ||
is_windows_drive_prefix(filename))
return bdrv_find_format("raw");
#endif
p = strchr(filename, ':');
if (!p)
return bdrv_find_format("raw");
len = p - filename;
if (len > sizeof(protocol) - 1)
len = sizeof(protocol) - 1;
memcpy(protocol, filename, len);
protocol[len] = '\0';
QLIST_FOREACH(drv1, &bdrv_drivers, list) {
if (drv1->protocol_name &&
!strcmp(drv1->protocol_name, protocol)) {
return drv1;
}
}
return NULL;
}
/*
* Detect host devices. By convention, /dev/cdrom[N] is always
* recognized as a host CDROM.
@ -297,6 +281,42 @@ static BlockDriver *find_hdev_driver(const char *filename)
return drv;
}
static BlockDriver *find_protocol(const char *filename)
{
BlockDriver *drv1;
char protocol[128];
int len;
const char *p;
/* TODO Drivers without bdrv_file_open must be specified explicitly */
#ifdef _WIN32
if (is_windows_drive(filename) ||
is_windows_drive_prefix(filename))
return bdrv_find_format("file");
#endif
p = strchr(filename, ':');
if (!p) {
drv1 = find_hdev_driver(filename);
if (!drv1) {
drv1 = bdrv_find_format("file");
}
return drv1;
}
len = p - filename;
if (len > sizeof(protocol) - 1)
len = sizeof(protocol) - 1;
memcpy(protocol, filename, len);
protocol[len] = '\0';
QLIST_FOREACH(drv1, &bdrv_drivers, list) {
if (drv1->protocol_name &&
!strcmp(drv1->protocol_name, protocol)) {
return drv1;
}
}
return NULL;
}
static BlockDriver *find_image_format(const char *filename)
{
int ret, score, score_max;
@ -319,6 +339,7 @@ static BlockDriver *find_image_format(const char *filename)
}
score_max = 0;
drv = NULL;
QLIST_FOREACH(drv1, &bdrv_drivers, list) {
if (drv1->bdrv_probe) {
score = drv1->bdrv_probe(buf, ret, filename);
@ -331,6 +352,118 @@ static BlockDriver *find_image_format(const char *filename)
return drv;
}
/**
* Set the current 'total_sectors' value
*/
static int refresh_total_sectors(BlockDriverState *bs, int64_t hint)
{
BlockDriver *drv = bs->drv;
/* query actual device if possible, otherwise just trust the hint */
if (drv->bdrv_getlength) {
int64_t length = drv->bdrv_getlength(bs);
if (length < 0) {
return length;
}
hint = length >> BDRV_SECTOR_BITS;
}
bs->total_sectors = hint;
return 0;
}
/*
* Common part for opening disk images and files
*/
static int bdrv_open_common(BlockDriverState *bs, const char *filename,
int flags, BlockDriver *drv)
{
int ret, open_flags;
assert(drv != NULL);
bs->file = NULL;
bs->total_sectors = 0;
bs->is_temporary = 0;
bs->encrypted = 0;
bs->valid_key = 0;
bs->open_flags = flags;
/* buffer_alignment defaulted to 512, drivers can change this value */
bs->buffer_alignment = 512;
pstrcpy(bs->filename, sizeof(bs->filename), filename);
if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
return -ENOTSUP;
}
bs->drv = drv;
bs->opaque = qemu_mallocz(drv->instance_size);
/*
* Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
* write cache to the guest. We do need the fdatasync to flush
* out transactions for block allocations, and we maybe have a
* volatile write cache in our backing device to deal with.
*/
if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
bs->enable_write_cache = 1;
/*
* Clear flags that are internal to the block layer before opening the
* image.
*/
open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
/*
* Snapshots should be writeable.
*/
if (bs->is_temporary) {
open_flags |= BDRV_O_RDWR;
}
/* Open the image, either directly or using a protocol */
if (drv->bdrv_file_open) {
ret = drv->bdrv_file_open(bs, filename, open_flags);
} else {
ret = bdrv_file_open(&bs->file, filename, open_flags);
if (ret >= 0) {
ret = drv->bdrv_open(bs, open_flags);
}
}
if (ret < 0) {
goto free_and_fail;
}
bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR);
ret = refresh_total_sectors(bs, bs->total_sectors);
if (ret < 0) {
goto free_and_fail;
}
#ifndef _WIN32
if (bs->is_temporary) {
unlink(filename);
}
#endif
return 0;
free_and_fail:
if (bs->file) {
bdrv_delete(bs->file);
bs->file = NULL;
}
qemu_free(bs->opaque);
bs->opaque = NULL;
bs->drv = NULL;
return ret;
}
/*
* Opens a file using a protocol (file, host_device, nbd, ...)
*/
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
{
BlockDriverState *bs;
@ -343,7 +476,7 @@ int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
}
bs = bdrv_new("");
ret = bdrv_open(bs, filename, flags, drv);
ret = bdrv_open_common(bs, filename, flags, drv);
if (ret < 0) {
bdrv_delete(bs);
return ret;
@ -353,19 +486,13 @@ int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
return 0;
}
/*
* Opens a disk image (raw, qcow2, vmdk, ...)
*/
int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
BlockDriver *drv)
{
int ret, open_flags;
char tmp_filename[PATH_MAX];
char backing_filename[PATH_MAX];
bs->is_temporary = 0;
bs->encrypted = 0;
bs->valid_key = 0;
bs->open_flags = flags;
/* buffer_alignment defaulted to 512, drivers can change this value */
bs->buffer_alignment = 512;
int ret;
if (flags & BDRV_O_SNAPSHOT) {
BlockDriverState *bs1;
@ -373,6 +500,8 @@ int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
int is_protocol = 0;
BlockDriver *bdrv_qcow2;
QEMUOptionParameter *options;
char tmp_filename[PATH_MAX];
char backing_filename[PATH_MAX];
/* if snapshot, we create a temporary backing file and open it
instead of opening 'filename' directly */
@ -411,6 +540,7 @@ int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
}
ret = bdrv_create(bdrv_qcow2, tmp_filename, options);
free_option_parameters(options);
if (ret < 0) {
return ret;
}
@ -420,66 +550,28 @@ int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
bs->is_temporary = 1;
}
pstrcpy(bs->filename, sizeof(bs->filename), filename);
/* Find the right image format driver */
if (!drv) {
drv = find_hdev_driver(filename);
if (!drv) {
drv = find_image_format(filename);
}
drv = find_image_format(filename);
}
if (!drv) {
ret = -ENOENT;
goto unlink_and_fail;
}
if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
ret = -ENOTSUP;
/* Open the image */
ret = bdrv_open_common(bs, filename, flags, drv);
if (ret < 0) {
goto unlink_and_fail;
}
bs->drv = drv;
bs->opaque = qemu_mallocz(drv->instance_size);
/*
* Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
* write cache to the guest. We do need the fdatasync to flush
* out transactions for block allocations, and we maybe have a
* volatile write cache in our backing device to deal with.
*/
if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
bs->enable_write_cache = 1;
/*
* Clear flags that are internal to the block layer before opening the
* image.
*/
open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
/*
* Snapshots should be writeable.
*/
if (bs->is_temporary) {
open_flags |= BDRV_O_RDWR;
}
ret = drv->bdrv_open(bs, filename, open_flags);
if (ret < 0) {
goto free_and_fail;
}
bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR);
if (drv->bdrv_getlength) {
bs->total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
}
#ifndef _WIN32
if (bs->is_temporary) {
unlink(filename);
}
#endif
/* If there is a backing file, use it */
if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') {
/* if there is a backing file, use it */
char backing_filename[PATH_MAX];
int back_flags;
BlockDriver *back_drv = NULL;
bs->backing_hd = bdrv_new("");
path_combine(backing_filename, sizeof(backing_filename),
filename, bs->backing_file);
@ -487,9 +579,10 @@ int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
back_drv = bdrv_find_format(bs->backing_format);
/* backing files always opened read-only */
open_flags &= ~BDRV_O_RDWR;
back_flags =
flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
ret = bdrv_open(bs->backing_hd, backing_filename, open_flags, back_drv);
ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv);
if (ret < 0) {
bdrv_close(bs);
return ret;
@ -508,23 +601,23 @@ int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
if (bs->change_cb)
bs->change_cb(bs->change_opaque);
}
return 0;
free_and_fail:
qemu_free(bs->opaque);
bs->opaque = NULL;
bs->drv = NULL;
unlink_and_fail:
if (bs->is_temporary)
if (bs->is_temporary) {
unlink(filename);
}
return ret;
}
void bdrv_close(BlockDriverState *bs)
{
if (bs->drv) {
if (bs->backing_hd)
if (bs->backing_hd) {
bdrv_delete(bs->backing_hd);
bs->backing_hd = NULL;
}
bs->drv->bdrv_close(bs);
qemu_free(bs->opaque);
#ifdef _WIN32
@ -535,6 +628,10 @@ void bdrv_close(BlockDriverState *bs)
bs->opaque = NULL;
bs->drv = NULL;
if (bs->file != NULL) {
bdrv_close(bs->file);
}
/* call the change callback */
bs->media_changed = 1;
if (bs->change_cb)
@ -550,6 +647,10 @@ void bdrv_delete(BlockDriverState *bs)
}
bdrv_close(bs);
if (bs->file != NULL) {
bdrv_delete(bs->file);
}
qemu_free(bs);
}
@ -780,6 +881,10 @@ int bdrv_write(BlockDriverState *bs, int64_t sector_num,
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
}
if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
bs->wr_highest_sector = sector_num + nb_sectors - 1;
}
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
}
@ -883,13 +988,18 @@ int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
{
BlockDriver *drv = bs->drv;
int ret;
if (!drv)
return -ENOMEDIUM;
if (!drv->bdrv_truncate)
return -ENOTSUP;
if (bs->read_only)
return -EACCES;
return drv->bdrv_truncate(bs, offset);
ret = drv->bdrv_truncate(bs, offset);
if (ret == 0) {
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
}
return ret;
}
/**
@ -900,8 +1010,12 @@ int64_t bdrv_getlength(BlockDriverState *bs)
BlockDriver *drv = bs->drv;
if (!drv)
return -ENOMEDIUM;
if (!drv->bdrv_getlength) {
/* legacy mode */
/* Fixed size devices use the total_sectors value for speed instead of
issuing a length query (like lseek) on each call. Also, legacy block
drivers don't provide a bdrv_getlength function and must use
total_sectors. */
if (!bs->growable || !drv->bdrv_getlength) {
return bs->total_sectors * BDRV_SECTOR_SIZE;
}
return drv->bdrv_getlength(bs);
@ -1208,6 +1322,19 @@ void bdrv_flush_all(void)
}
}
int bdrv_has_zero_init(BlockDriverState *bs)
{
assert(bs->drv);
if (bs->drv->no_zero_init) {
return 0;
} else if (bs->file) {
return bdrv_has_zero_init(bs->file);
}
return 1;
}
/*
* Returns true iff the specified sector is present in the disk image. Drivers
* not implementing the functionality are assumed to not support backing files,
@ -1408,6 +1535,35 @@ void bdrv_stats_print(Monitor *mon, const QObject *data)
qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon);
}
static QObject* bdrv_info_stats_bs(BlockDriverState *bs)
{
QObject *res;
QDict *dict;
res = qobject_from_jsonf("{ 'stats': {"
"'rd_bytes': %" PRId64 ","
"'wr_bytes': %" PRId64 ","
"'rd_operations': %" PRId64 ","
"'wr_operations': %" PRId64 ","
"'wr_highest_offset': %" PRId64
"} }",
bs->rd_bytes, bs->wr_bytes,
bs->rd_ops, bs->wr_ops,
bs->wr_highest_sector * 512);
dict = qobject_to_qdict(res);
if (*bs->device_name) {
qdict_put(dict, "device", qstring_from_str(bs->device_name));
}
if (bs->file) {
QObject *parent = bdrv_info_stats_bs(bs->file);
qdict_put_obj(dict, "parent", parent);
}
return res;
}
/**
* bdrv_info_stats(): show block device statistics
*
@ -1422,19 +1578,34 @@ void bdrv_stats_print(Monitor *mon, const QObject *data)
* - "wr_bytes": bytes written
* - "rd_operations": read operations
* - "wr_operations": write operations
*
* - "wr_highest_offset": Highest offset of a sector written since the
* BlockDriverState has been opened
* - "parent": Contains recursively the statistics of the underlying
* protocol (e.g. the host file for a qcow2 image). If there is no
* underlying protocol, this field is omitted.
*
* Example:
*
* [ { "device": "ide0-hd0",
* "stats": { "rd_bytes": 512,
* "wr_bytes": 0,
* "rd_operations": 1,
* "wr_operations": 0 } },
* "wr_operations": 0,
* "wr_highest_offset": 0,
* "parent": {
* "stats": { "rd_bytes": 1024,
* "wr_bytes": 0,
* "rd_operations": 2,
* "wr_operations": 0,
* "wr_highest_offset": 0,
* }
* } } },
* { "device": "ide1-cd0",
* "stats": { "rd_bytes": 0,
* "wr_bytes": 0,
* "rd_operations": 0,
* "wr_operations": 0 } } ]
* "wr_operations": 0,
* "wr_highest_offset": 0 } },
*/
void bdrv_info_stats(Monitor *mon, QObject **ret_data)
{
@ -1445,15 +1616,7 @@ void bdrv_info_stats(Monitor *mon, QObject **ret_data)
devices = qlist_new();
QTAILQ_FOREACH(bs, &bdrv_states, list) {
obj = qobject_from_jsonf("{ 'device': %s, 'stats': {"
"'rd_bytes': %" PRId64 ","
"'wr_bytes': %" PRId64 ","
"'rd_operations': %" PRId64 ","
"'wr_operations': %" PRId64
"} }",
bs->device_name,
bs->rd_bytes, bs->wr_bytes,
bs->rd_ops, bs->wr_ops);
obj = bdrv_info_stats_bs(bs);
qlist_append_obj(devices, obj);
}
@ -1712,9 +1875,12 @@ BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
cb, opaque);
if (ret) {
/* Update stats even though technically transfer has not happened. */
bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
bs->wr_ops ++;
/* Update stats even though technically transfer has not happened. */
bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
bs->wr_ops ++;
if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
bs->wr_highest_sector = sector_num + nb_sectors - 1;
}
}
return ret;

2
block.h
View File

@ -57,6 +57,7 @@ BlockDriver *bdrv_find_format(const char *format_name);
BlockDriver *bdrv_find_whitelisted_format(const char *format_name);
int bdrv_create(BlockDriver *drv, const char* filename,
QEMUOptionParameter *options);
int bdrv_create_file(const char* filename, QEMUOptionParameter *options);
BlockDriverState *bdrv_new(const char *device_name);
void bdrv_delete(BlockDriverState *bs);
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags);
@ -121,6 +122,7 @@ BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
void bdrv_flush(BlockDriverState *bs);
void bdrv_flush_all(void);
int bdrv_has_zero_init(BlockDriverState *bs);
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
int *pnum);

17
block/blkdebug.c
View File

@ -44,7 +44,6 @@ typedef struct BlkdebugVars {
} BlkdebugVars;
typedef struct BDRVBlkdebugState {
BlockDriverState *hd;
BlkdebugVars vars;
QLIST_HEAD(list, BlkdebugRule) rules[BLKDBG_EVENT_MAX];
} BDRVBlkdebugState;
@ -303,7 +302,7 @@ static int blkdebug_open(BlockDriverState *bs, const char *filename, int flags)
filename = c + 1;
/* Open the backing file */
ret = bdrv_file_open(&s->hd, filename, flags);
ret = bdrv_file_open(&bs->file, filename, flags);
if (ret < 0) {
return ret;
}
@ -362,7 +361,7 @@ static BlockDriverAIOCB *blkdebug_aio_readv(BlockDriverState *bs,
}
BlockDriverAIOCB *acb =
bdrv_aio_readv(s->hd, sector_num, qiov, nb_sectors, cb, opaque);
bdrv_aio_readv(bs->file, sector_num, qiov, nb_sectors, cb, opaque);
return acb;
}
@ -377,7 +376,7 @@ static BlockDriverAIOCB *blkdebug_aio_writev(BlockDriverState *bs,
}
BlockDriverAIOCB *acb =
bdrv_aio_writev(s->hd, sector_num, qiov, nb_sectors, cb, opaque);
bdrv_aio_writev(bs->file, sector_num, qiov, nb_sectors, cb, opaque);
return acb;
}
@ -393,21 +392,17 @@ static void blkdebug_close(BlockDriverState *bs)
qemu_free(rule);
}
}
bdrv_delete(s->hd);
}
static void blkdebug_flush(BlockDriverState *bs)
{
BDRVBlkdebugState *s = bs->opaque;
bdrv_flush(s->hd);
bdrv_flush(bs->file);
}
static BlockDriverAIOCB *blkdebug_aio_flush(BlockDriverState *bs,
BlockDriverCompletionFunc *cb, void *opaque)
{
BDRVBlkdebugState *s = bs->opaque;
return bdrv_aio_flush(s->hd, cb, opaque);
return bdrv_aio_flush(bs->file, cb, opaque);
}
static void process_rule(BlockDriverState *bs, struct BlkdebugRule *rule,
@ -456,7 +451,7 @@ static BlockDriver bdrv_blkdebug = {
.instance_size = sizeof(BDRVBlkdebugState),
.bdrv_open = blkdebug_open,
.bdrv_file_open = blkdebug_open,
.bdrv_close = blkdebug_close,
.bdrv_flush = blkdebug_flush,

2
block/bochs.c
View File

@ -252,7 +252,7 @@ static BlockDriver bdrv_bochs = {
.format_name = "bochs",
.instance_size = sizeof(BDRVBochsState),
.bdrv_probe = bochs_probe,
.bdrv_open = bochs_open,
.bdrv_file_open = bochs_open,
.bdrv_read = bochs_read,
.bdrv_close = bochs_close,
};

2
block/cloop.c
View File

@ -158,7 +158,7 @@ static BlockDriver bdrv_cloop = {
.format_name = "cloop",
.instance_size = sizeof(BDRVCloopState),
.bdrv_probe = cloop_probe,
.bdrv_open = cloop_open,
.bdrv_file_open = cloop_open,
.bdrv_read = cloop_read,
.bdrv_close = cloop_close,
};

2
block/cow.c
View File

@ -291,7 +291,7 @@ static BlockDriver bdrv_cow = {
.format_name = "cow",
.instance_size = sizeof(BDRVCowState),
.bdrv_probe = cow_probe,
.bdrv_open = cow_open,
.bdrv_file_open = cow_open,
.bdrv_read = cow_read,
.bdrv_write = cow_write,
.bdrv_close = cow_close,

10
block/curl.c
View File

@ -495,7 +495,7 @@ static BlockDriver bdrv_http = {
.protocol_name = "http",
.instance_size = sizeof(BDRVCURLState),
.bdrv_open = curl_open,
.bdrv_file_open = curl_open,
.bdrv_close = curl_close,
.bdrv_getlength = curl_getlength,
@ -507,7 +507,7 @@ static BlockDriver bdrv_https = {
.protocol_name = "https",
.instance_size = sizeof(BDRVCURLState),
.bdrv_open = curl_open,
.bdrv_file_open = curl_open,
.bdrv_close = curl_close,
.bdrv_getlength = curl_getlength,
@ -519,7 +519,7 @@ static BlockDriver bdrv_ftp = {
.protocol_name = "ftp",
.instance_size = sizeof(BDRVCURLState),
.bdrv_open = curl_open,
.bdrv_file_open = curl_open,
.bdrv_close = curl_close,
.bdrv_getlength = curl_getlength,
@ -531,7 +531,7 @@ static BlockDriver bdrv_ftps = {
.protocol_name = "ftps",
.instance_size = sizeof(BDRVCURLState),
.bdrv_open = curl_open,
.bdrv_file_open = curl_open,
.bdrv_close = curl_close,
.bdrv_getlength = curl_getlength,
@ -543,7 +543,7 @@ static BlockDriver bdrv_tftp = {
.protocol_name = "tftp",
.instance_size = sizeof(BDRVCURLState),
.bdrv_open = curl_open,
.bdrv_file_open = curl_open,
.bdrv_close = curl_close,
.bdrv_getlength = curl_getlength,

2
block/dmg.c
View File

@ -288,7 +288,7 @@ static BlockDriver bdrv_dmg = {
.format_name = "dmg",
.instance_size = sizeof(BDRVDMGState),
.bdrv_probe = dmg_probe,
.bdrv_open = dmg_open,
.bdrv_file_open = dmg_open,
.bdrv_read = dmg_read,
.bdrv_close = dmg_close,
};

2
block/nbd.c
View File

@ -177,7 +177,7 @@ static int64_t nbd_getlength(BlockDriverState *bs)
static BlockDriver bdrv_nbd = {
.format_name = "nbd",
.instance_size = sizeof(BDRVNBDState),
.bdrv_open = nbd_open,
.bdrv_file_open = nbd_open,
.bdrv_read = nbd_read,
.bdrv_write = nbd_write,
.bdrv_close = nbd_close,

2
block/parallels.c
View File

@ -167,7 +167,7 @@ static BlockDriver bdrv_parallels = {
.format_name = "parallels",
.instance_size = sizeof(BDRVParallelsState),
.bdrv_probe = parallels_probe,
.bdrv_open = parallels_open,
.bdrv_file_open = parallels_open,
.bdrv_read = parallels_read,
.bdrv_close = parallels_close,
};

67
block/qcow.c
View File

@ -76,7 +76,7 @@ typedef struct BDRVQcowState {
AES_KEY aes_decrypt_key;
} BDRVQcowState;
static int decompress_cluster(BDRVQcowState *s, uint64_t cluster_offset);
static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset);
static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename)
{
@ -90,16 +90,13 @@ static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename)
return 0;
}
static int qcow_open(BlockDriverState *bs, const char *filename, int flags)
static int qcow_open(BlockDriverState *bs, int flags)
{
BDRVQcowState *s = bs->opaque;
int len, i, shift, ret;
int len, i, shift;
QCowHeader header;
ret = bdrv_file_open(&s->hd, filename, flags);
if (ret < 0)
return ret;
if (bdrv_pread(s->hd, 0, &header, sizeof(header)) != sizeof(header))
if (bdrv_pread(bs->file, 0, &header, sizeof(header)) != sizeof(header))
goto fail;
be32_to_cpus(&header.magic);
be32_to_cpus(&header.version);
@ -135,7 +132,7 @@ static int qcow_open(BlockDriverState *bs, const char *filename, int flags)
s->l1_table = qemu_malloc(s->l1_size * sizeof(uint64_t));
if (!s->l1_table)
goto fail;
if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) !=
if (bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) !=
s->l1_size * sizeof(uint64_t))
goto fail;
for(i = 0;i < s->l1_size; i++) {
@ -158,7 +155,7 @@ static int qcow_open(BlockDriverState *bs, const char *filename, int flags)
len = header.backing_file_size;
if (len > 1023)
len = 1023;
if (bdrv_pread(s->hd, header.backing_file_offset, bs->backing_file, len) != len)
if (bdrv_pread(bs->file, header.backing_file_offset, bs->backing_file, len) != len)
goto fail;
bs->backing_file[len] = '\0';
}
@ -169,7 +166,6 @@ static int qcow_open(BlockDriverState *bs, const char *filename, int flags)
qemu_free(s->l2_cache);
qemu_free(s->cluster_cache);
qemu_free(s->cluster_data);
bdrv_delete(s->hd);
return -1;
}
@ -271,13 +267,13 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
if (!allocate)
return 0;
/* allocate a new l2 entry */
l2_offset = bdrv_getlength(s->hd);
l2_offset = bdrv_getlength(bs->file);
/* round to cluster size */
l2_offset = (l2_offset + s->cluster_size - 1) & ~(s->cluster_size - 1);
/* update the L1 entry */
s->l1_table[l1_index] = l2_offset;
tmp = cpu_to_be64(l2_offset);
if (bdrv_pwrite(s->hd, s->l1_table_offset + l1_index * sizeof(tmp),
if (bdrv_pwrite(bs->file, s->l1_table_offset + l1_index * sizeof(tmp),
&tmp, sizeof(tmp)) != sizeof(tmp))
return 0;
new_l2_table = 1;
@ -306,11 +302,11 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
l2_table = s->l2_cache + (min_index << s->l2_bits);
if (new_l2_table) {
memset(l2_table, 0, s->l2_size * sizeof(uint64_t));
if (bdrv_pwrite(s->hd, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) !=
if (bdrv_pwrite(bs->file, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) !=
s->l2_size * sizeof(uint64_t))
return 0;
} else {
if (bdrv_pread(s->hd, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) !=
if (bdrv_pread(bs->file, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) !=
s->l2_size * sizeof(uint64_t))
return 0;
}
@ -329,22 +325,22 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
/* if the cluster is already compressed, we must
decompress it in the case it is not completely
overwritten */
if (decompress_cluster(s, cluster_offset) < 0)
if (decompress_cluster(bs, cluster_offset) < 0)
return 0;
cluster_offset = bdrv_getlength(s->hd);
cluster_offset = bdrv_getlength(bs->file);
cluster_offset = (cluster_offset + s->cluster_size - 1) &
~(s->cluster_size - 1);
/* write the cluster content */
if (bdrv_pwrite(s->hd, cluster_offset, s->cluster_cache, s->cluster_size) !=
if (bdrv_pwrite(bs->file, cluster_offset, s->cluster_cache, s->cluster_size) !=
s->cluster_size)
return -1;
} else {
cluster_offset = bdrv_getlength(s->hd);
cluster_offset = bdrv_getlength(bs->file);
if (allocate == 1) {
/* round to cluster size */
cluster_offset = (cluster_offset + s->cluster_size - 1) &
~(s->cluster_size - 1);
bdrv_truncate(s->hd, cluster_offset + s->cluster_size);
bdrv_truncate(bs->file, cluster_offset + s->cluster_size);
/* if encrypted, we must initialize the cluster
content which won't be written */
if (s->crypt_method &&
@ -358,7 +354,7 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
s->cluster_data,
s->cluster_data + 512, 1, 1,
&s->aes_encrypt_key);
if (bdrv_pwrite(s->hd, cluster_offset + i * 512,
if (bdrv_pwrite(bs->file, cluster_offset + i * 512,
s->cluster_data, 512) != 512)
return -1;
}
@ -372,7 +368,7 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
/* update L2 table */
tmp = cpu_to_be64(cluster_offset);
l2_table[l2_index] = tmp;
if (bdrv_pwrite(s->hd,
if (bdrv_pwrite(bs->file,
l2_offset + l2_index * sizeof(tmp), &tmp, sizeof(tmp)) != sizeof(tmp))
return 0;
}
@ -422,8 +418,9 @@ static int decompress_buffer(uint8_t *out_buf, int out_buf_size,
return 0;
}
static int decompress_cluster(BDRVQcowState *s, uint64_t cluster_offset)
static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset)
{
BDRVQcowState *s = bs->opaque;
int ret, csize;
uint64_t coffset;
@ -431,7 +428,7 @@ static int decompress_cluster(BDRVQcowState *s, uint64_t cluster_offset)
if (s->cluster_cache_offset != coffset) {
csize = cluster_offset >> (63 - s->cluster_bits);
csize &= (s->cluster_size - 1);
ret = bdrv_pread(s->hd, coffset, s->cluster_data, csize);
ret = bdrv_pread(bs->file, coffset, s->cluster_data, csize);
if (ret != csize)
return -1;
if (decompress_buffer(s->cluster_cache, s->cluster_size,
@ -468,11 +465,11 @@ static int qcow_read(BlockDriverState *bs, int64_t sector_num,
memset(buf, 0, 512 * n);
}
} else if (cluster_offset & QCOW_OFLAG_COMPRESSED) {
if (decompress_cluster(s, cluster_offset) < 0)
if (decompress_cluster(bs, cluster_offset) < 0)
return -1;
memcpy(buf, s->cluster_cache + index_in_cluster * 512, 512 * n);
} else {
ret = bdrv_pread(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512);
ret = bdrv_pread(bs->file, cluster_offset + index_in_cluster * 512, buf, n * 512);
if (ret != n * 512)
return -1;
if (s->crypt_method) {
@ -601,7 +598,7 @@ static void qcow_aio_read_cb(void *opaque, int ret)
}
} else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) {
/* add AIO support for compressed blocks ? */
if (decompress_cluster(s, acb->cluster_offset) < 0)
if (decompress_cluster(bs, acb->cluster_offset) < 0)
goto done;
memcpy(acb->buf,
s->cluster_cache + index_in_cluster * 512, 512 * acb->n);
@ -614,7 +611,7 @@ static void qcow_aio_read_cb(void *opaque, int ret)
acb->hd_iov.iov_base = (void *)acb->buf;
acb->hd_iov.iov_len = acb->n * 512;
qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
acb->hd_aiocb = bdrv_aio_readv(s->hd,
acb->hd_aiocb = bdrv_aio_readv(bs->file,
(acb->cluster_offset >> 9) + index_in_cluster,
&acb->hd_qiov, acb->n, qcow_aio_read_cb, acb);
if (acb->hd_aiocb == NULL)
@ -699,7 +696,7 @@ static void qcow_aio_write_cb(void *opaque, int ret)
acb->hd_iov.iov_base = (void *)src_buf;
acb->hd_iov.iov_len = acb->n * 512;
qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
acb->hd_aiocb = bdrv_aio_writev(s->hd,
acb->hd_aiocb = bdrv_aio_writev(bs->file,
(cluster_offset >> 9) + index_in_cluster,
&acb->hd_qiov, acb->n,
qcow_aio_write_cb, acb);
@ -739,7 +736,6 @@ static void qcow_close(BlockDriverState *bs)
qemu_free(s->l2_cache);
qemu_free(s->cluster_cache);
qemu_free(s->cluster_data);
bdrv_delete(s->hd);
}
static int qcow_create(const char *filename, QEMUOptionParameter *options)
@ -839,9 +835,9 @@ static int qcow_make_empty(BlockDriverState *bs)
int ret;
memset(s->l1_table, 0, l1_length);
if (bdrv_pwrite(s->hd, s->l1_table_offset, s->l1_table, l1_length) < 0)
if (bdrv_pwrite(bs->file, s->l1_table_offset, s->l1_table, l1_length) < 0)
return -1;
ret = bdrv_truncate(s->hd, s->l1_table_offset + l1_length);
ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length);
if (ret < 0)
return ret;
@ -902,7 +898,7 @@ static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
cluster_offset = get_cluster_offset(bs, sector_num << 9, 2,
out_len, 0, 0);
cluster_offset &= s->cluster_offset_mask;
if (bdrv_pwrite(s->hd, cluster_offset, out_buf, out_len) != out_len) {
if (bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len) != out_len) {
qemu_free(out_buf);
return -1;
}
@ -914,16 +910,13 @@ static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
static void qcow_flush(BlockDriverState *bs)
{
BDRVQcowState *s = bs->opaque;
bdrv_flush(s->hd);
bdrv_flush(bs->file);
}
static BlockDriverAIOCB *qcow_aio_flush(BlockDriverState *bs,
BlockDriverCompletionFunc *cb, void *opaque)
{
BDRVQcowState *s = bs->opaque;
return bdrv_aio_flush(s->hd, cb, opaque);
return bdrv_aio_flush(bs->file, cb, opaque);
}
static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)

64
block/qcow2-cluster.c
View File

@ -54,27 +54,27 @@ int qcow2_grow_l1_table(BlockDriverState *bs, int min_size)
memcpy(new_l1_table, s->l1_table, s->l1_size * sizeof(uint64_t));
/* write new table (align to cluster) */
BLKDBG_EVENT(s->hd, BLKDBG_L1_GROW_ALLOC_TABLE);
BLKDBG_EVENT(bs->file, BLKDBG_L1_GROW_ALLOC_TABLE);
new_l1_table_offset = qcow2_alloc_clusters(bs, new_l1_size2);
if (new_l1_table_offset < 0) {
qemu_free(new_l1_table);
return new_l1_table_offset;
}
BLKDBG_EVENT(s->hd, BLKDBG_L1_GROW_WRITE_TABLE);
BLKDBG_EVENT(bs->file, BLKDBG_L1_GROW_WRITE_TABLE);
for(i = 0; i < s->l1_size; i++)
new_l1_table[i] = cpu_to_be64(new_l1_table[i]);
ret = bdrv_pwrite(s->hd, new_l1_table_offset, new_l1_table, new_l1_size2);
ret = bdrv_pwrite(bs->file, new_l1_table_offset, new_l1_table, new_l1_size2);
if (ret != new_l1_size2)
goto fail;
for(i = 0; i < s->l1_size; i++)
new_l1_table[i] = be64_to_cpu(new_l1_table[i]);
/* set new table */
BLKDBG_EVENT(s->hd, BLKDBG_L1_GROW_ACTIVATE_TABLE);
BLKDBG_EVENT(bs->file, BLKDBG_L1_GROW_ACTIVATE_TABLE);
cpu_to_be32w((uint32_t*)data, new_l1_size);
cpu_to_be64w((uint64_t*)(data + 4), new_l1_table_offset);
ret = bdrv_pwrite(s->hd, offsetof(QCowHeader, l1_size), data,sizeof(data));
ret = bdrv_pwrite(bs->file, offsetof(QCowHeader, l1_size), data,sizeof(data));
if (ret != sizeof(data)) {
goto fail;
}
@ -174,8 +174,8 @@ static uint64_t *l2_load(BlockDriverState *bs, uint64_t l2_offset)
min_index = l2_cache_new_entry(bs);
l2_table = s->l2_cache + (min_index << s->l2_bits);
BLKDBG_EVENT(s->hd, BLKDBG_L2_LOAD);
if (bdrv_pread(s->hd, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) !=
BLKDBG_EVENT(bs->file, BLKDBG_L2_LOAD);
if (bdrv_pread(bs->file, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) !=
s->l2_size * sizeof(uint64_t))
return NULL;
s->l2_cache_offsets[min_index] = l2_offset;
@ -189,8 +189,9 @@ static uint64_t *l2_load(BlockDriverState *bs, uint64_t l2_offset)
* and we really don't want bdrv_pread to perform a read-modify-write)
*/
#define L1_ENTRIES_PER_SECTOR (512 / 8)
static int write_l1_entry(BDRVQcowState *s, int l1_index)
static int write_l1_entry(BlockDriverState *bs, int l1_index)
{
BDRVQcowState *s = bs->opaque;
uint64_t buf[L1_ENTRIES_PER_SECTOR];
int l1_start_index;
int i, ret;
@ -200,8 +201,8 @@ static int write_l1_entry(BDRVQcowState *s, int l1_index)
buf[i] = cpu_to_be64(s->l1_table[l1_start_index + i]);
}
BLKDBG_EVENT(s->hd, BLKDBG_L1_UPDATE);
ret = bdrv_pwrite(s->hd, s->l1_table_offset + 8 * l1_start_index,
BLKDBG_EVENT(bs->file, BLKDBG_L1_UPDATE);
ret = bdrv_pwrite(bs->file, s->l1_table_offset + 8 * l1_start_index,
buf, sizeof(buf));
if (ret < 0) {
return ret;
@ -241,7 +242,7 @@ static int l2_allocate(BlockDriverState *bs, int l1_index, uint64_t **table)
/* update the L1 entry */
s->l1_table[l1_index] = l2_offset | QCOW_OFLAG_COPIED;
ret = write_l1_entry(s, l1_index);
ret = write_l1_entry(bs, l1_index);
if (ret < 0) {
return ret;
}
@ -256,16 +257,16 @@ static int l2_allocate(BlockDriverState *bs, int l1_index, uint64_t **table)
memset(l2_table, 0, s->l2_size * sizeof(uint64_t));
} else {
/* if there was an old l2 table, read it from the disk */
BLKDBG_EVENT(s->hd, BLKDBG_L2_ALLOC_COW_READ);
ret = bdrv_pread(s->hd, old_l2_offset, l2_table,
BLKDBG_EVENT(bs->file, BLKDBG_L2_ALLOC_COW_READ);
ret = bdrv_pread(bs->file, old_l2_offset, l2_table,
s->l2_size * sizeof(uint64_t));
if (ret < 0) {
return ret;
}
}
/* write the l2 table to the file */
BLKDBG_EVENT(s->hd, BLKDBG_L2_ALLOC_WRITE);
ret = bdrv_pwrite(s->hd, l2_offset, l2_table,
BLKDBG_EVENT(bs->file, BLKDBG_L2_ALLOC_WRITE);
ret = bdrv_pwrite(bs->file, l2_offset, l2_table,
s->l2_size * sizeof(uint64_t));
if (ret < 0) {
return ret;
@ -348,7 +349,7 @@ static int qcow_read(BlockDriverState *bs, int64_t sector_num,
/* read from the base image */
n1 = qcow2_backing_read1(bs->backing_hd, sector_num, buf, n);
if (n1 > 0) {
BLKDBG_EVENT(s->hd, BLKDBG_READ_BACKING);
BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING);
ret = bdrv_read(bs->backing_hd, sector_num, buf, n1);
if (ret < 0)
return -1;
@ -357,12 +358,12 @@ static int qcow_read(BlockDriverState *bs, int64_t sector_num,
memset(buf, 0, 512 * n);
}
} else if (cluster_offset & QCOW_OFLAG_COMPRESSED) {
if (qcow2_decompress_cluster(s, cluster_offset) < 0)
if (qcow2_decompress_cluster(bs, cluster_offset) < 0)
return -1;
memcpy(buf, s->cluster_cache + index_in_cluster * 512, 512 * n);
} else {
BLKDBG_EVENT(s->hd, BLKDBG_READ);
ret = bdrv_pread(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512);
BLKDBG_EVENT(bs->file, BLKDBG_READ);
ret = bdrv_pread(bs->file, cluster_offset + index_in_cluster * 512, buf, n * 512);
if (ret != n * 512)
return -1;
if (s->crypt_method) {
@ -386,7 +387,7 @@ static int copy_sectors(BlockDriverState *bs, uint64_t start_sect,
n = n_end - n_start;
if (n <= 0)
return 0;
BLKDBG_EVENT(s->hd, BLKDBG_COW_READ);
BLKDBG_EVENT(bs->file, BLKDBG_COW_READ);
ret = qcow_read(bs, start_sect + n_start, s->cluster_data, n);
if (ret < 0)
return ret;
@ -396,8 +397,8 @@ static int copy_sectors(BlockDriverState *bs, uint64_t start_sect,
s->cluster_data, n, 1,
&s->aes_encrypt_key);
}
BLKDBG_EVENT(s->hd, BLKDBG_COW_WRITE);
ret = bdrv_write(s->hd, (cluster_offset >> 9) + n_start,
BLKDBG_EVENT(bs->file, BLKDBG_COW_WRITE);
ret = bdrv_write(bs->file, (cluster_offset >> 9) + n_start,
s->cluster_data, n);
if (ret < 0)
return ret;
@ -610,9 +611,9 @@ uint64_t qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
/* compressed clusters never have the copied flag */
BLKDBG_EVENT(s->hd, BLKDBG_L2_UPDATE_COMPRESSED);
BLKDBG_EVENT(bs->file, BLKDBG_L2_UPDATE_COMPRESSED);
l2_table[l2_index] = cpu_to_be64(cluster_offset);
if (bdrv_pwrite(s->hd,
if (bdrv_pwrite(bs->file,
l2_offset + l2_index * sizeof(uint64_t),
l2_table + l2_index,
sizeof(uint64_t)) != sizeof(uint64_t))
@ -626,7 +627,7 @@ uint64_t qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
* read-modify-write in bdrv_pwrite
*/
#define L2_ENTRIES_PER_SECTOR (512 / 8)
static int write_l2_entries(BDRVQcowState *s, uint64_t *l2_table,
static int write_l2_entries(BlockDriverState *bs, uint64_t *l2_table,
uint64_t l2_offset, int l2_index, int num)
{
int l2_start_index = l2_index & ~(L1_ENTRIES_PER_SECTOR - 1);
@ -635,8 +636,8 @@ static int write_l2_entries(BDRVQcowState *s, uint64_t *l2_table,
size_t len = end_offset - start_offset;
int ret;
BLKDBG_EVENT(s->hd, BLKDBG_L2_UPDATE);
ret = bdrv_pwrite(s->hd, l2_offset + start_offset,
BLKDBG_EVENT(bs->file, BLKDBG_L2_UPDATE);
ret = bdrv_pwrite(bs->file, l2_offset + start_offset,
&l2_table[l2_start_index], len);
if (ret < 0) {
return ret;
@ -693,7 +694,7 @@ int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m)
(i << s->cluster_bits)) | QCOW_OFLAG_COPIED);
}
ret = write_l2_entries(s, l2_table, l2_offset, l2_index, m->nb_clusters);
ret = write_l2_entries(bs, l2_table, l2_offset, l2_index, m->nb_clusters);
if (ret < 0) {
goto err;
}
@ -877,8 +878,9 @@ static int decompress_buffer(uint8_t *out_buf, int out_buf_size,
return 0;
}
int qcow2_decompress_cluster(BDRVQcowState *s, uint64_t cluster_offset)
int qcow2_decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset)
{
BDRVQcowState *s = bs->opaque;
int ret, csize, nb_csectors, sector_offset;
uint64_t coffset;
@ -887,8 +889,8 @@ int qcow2_decompress_cluster(BDRVQcowState *s, uint64_t cluster_offset)
nb_csectors = ((cluster_offset >> s->csize_shift) & s->csize_mask) + 1;
sector_offset = coffset & 511;
csize = nb_csectors * 512 - sector_offset;
BLKDBG_EVENT(s->hd, BLKDBG_READ_COMPRESSED);
ret = bdrv_read(s->hd, coffset >> 9, s->cluster_data, nb_csectors);
BLKDBG_EVENT(bs->file, BLKDBG_READ_COMPRESSED);
ret = bdrv_read(bs->file, coffset >> 9, s->cluster_data, nb_csectors);
if (ret < 0) {
return -1;
}

86
block/qcow2-refcount.c
View File

@ -34,16 +34,17 @@ static int QEMU_WARN_UNUSED_RESULT update_refcount(BlockDriverState *bs,
static int cache_refcount_updates = 0;
static int write_refcount_block(BDRVQcowState *s)
static int write_refcount_block(BlockDriverState *bs)
{
BDRVQcowState *s = bs->opaque;
size_t size = s->cluster_size;
if (s->refcount_block_cache_offset == 0) {
return 0;
}
BLKDBG_EVENT(s->hd, BLKDBG_REFBLOCK_UPDATE);
if (bdrv_pwrite(s->hd, s->refcount_block_cache_offset,
BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_UPDATE);
if (bdrv_pwrite(bs->file, s->refcount_block_cache_offset,
s->refcount_block_cache, size) != size)
{
return -EIO;
@ -64,8 +65,8 @@ int qcow2_refcount_init(BlockDriverState *bs)
refcount_table_size2 = s->refcount_table_size * sizeof(uint64_t);
s->refcount_table = qemu_malloc(refcount_table_size2);
if (s->refcount_table_size > 0) {
BLKDBG_EVENT(s->hd, BLKDBG_REFTABLE_LOAD);
ret = bdrv_pread(s->hd, s->refcount_table_offset,
BLKDBG_EVENT(bs->file, BLKDBG_REFTABLE_LOAD);
ret = bdrv_pread(bs->file, s->refcount_table_offset,
s->refcount_table, refcount_table_size2);
if (ret != refcount_table_size2)
goto fail;
@ -92,11 +93,11 @@ static int load_refcount_block(BlockDriverState *bs,
int ret;
if (cache_refcount_updates) {
write_refcount_block(s);
write_refcount_block(bs);
}
BLKDBG_EVENT(s->hd, BLKDBG_REFBLOCK_LOAD);
ret = bdrv_pread(s->hd, refcount_block_offset, s->refcount_block_cache,
BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_LOAD);
ret = bdrv_pread(bs->file, refcount_block_offset, s->refcount_block_cache,
s->cluster_size);
if (ret != s->cluster_size)
return -EIO;
@ -167,7 +168,7 @@ static int64_t alloc_refcount_block(BlockDriverState *bs, int64_t cluster_index)
unsigned int refcount_table_index;
int ret;
BLKDBG_EVENT(s->hd, BLKDBG_REFBLOCK_ALLOC);
BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC);
/* Find the refcount block for the given cluster */
refcount_table_index = cluster_index >> (s->cluster_bits - REFCOUNT_SHIFT);
@ -212,7 +213,7 @@ static int64_t alloc_refcount_block(BlockDriverState *bs, int64_t cluster_index)
*/
if (cache_refcount_updates) {
ret = write_refcount_block(s);
ret = write_refcount_block(bs);
if (ret < 0) {
return ret;
}
@ -244,8 +245,8 @@ static int64_t alloc_refcount_block(BlockDriverState *bs, int64_t cluster_index)
}
/* Now the new refcount block needs to be written to disk */
BLKDBG_EVENT(s->hd, BLKDBG_REFBLOCK_ALLOC_WRITE);
ret = bdrv_pwrite(s->hd, new_block, s->refcount_block_cache,
BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC_WRITE);
ret = bdrv_pwrite(bs->file, new_block, s->refcount_block_cache,
s->cluster_size);
if (ret < 0) {
goto fail_block;
@ -254,8 +255,8 @@ static int64_t alloc_refcount_block(BlockDriverState *bs, int64_t cluster_index)
/* If the refcount table is big enough, just hook the block up there */
if (refcount_table_index < s->refcount_table_size) {
uint64_t data64 = cpu_to_be64(new_block);
BLKDBG_EVENT(s->hd, BLKDBG_REFBLOCK_ALLOC_HOOKUP);
ret = bdrv_pwrite(s->hd,
BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC_HOOKUP);
ret = bdrv_pwrite(bs->file,
s->refcount_table_offset + refcount_table_index * sizeof(uint64_t),
&data64, sizeof(data64));
if (ret < 0) {
@ -277,7 +278,7 @@ static int64_t alloc_refcount_block(BlockDriverState *bs, int64_t cluster_index)
* refcount table at once without producing an inconsistent state in
* between.
*/
BLKDBG_EVENT(s->hd, BLKDBG_REFTABLE_GROW);
BLKDBG_EVENT(bs->file, BLKDBG_REFTABLE_GROW);
/* Calculate the number of refcount blocks needed so far */
uint64_t refcount_block_clusters = 1 << (s->cluster_bits - REFCOUNT_SHIFT);
@ -334,8 +335,8 @@ static int64_t alloc_refcount_block(BlockDriverState *bs, int64_t cluster_index)
}
/* Write refcount blocks to disk */
BLKDBG_EVENT(s->hd, BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS);
ret = bdrv_pwrite(s->hd, meta_offset, new_blocks,
BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS);
ret = bdrv_pwrite(bs->file, meta_offset, new_blocks,
blocks_clusters * s->cluster_size);
qemu_free(new_blocks);
if (ret < 0) {
@ -347,8 +348,8 @@ static int64_t alloc_refcount_block(BlockDriverState *bs, int64_t cluster_index)
cpu_to_be64s(&new_table[i]);
}
BLKDBG_EVENT(s->hd, BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE);
ret = bdrv_pwrite(s->hd, table_offset, new_table,
BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE);
ret = bdrv_pwrite(bs->file, table_offset, new_table,
table_size * sizeof(uint64_t));
if (ret < 0) {
goto fail_table;
@ -362,8 +363,8 @@ static int64_t alloc_refcount_block(BlockDriverState *bs, int64_t cluster_index)
uint8_t data[12];
cpu_to_be64w((uint64_t*)data, table_offset);
cpu_to_be32w((uint32_t*)(data + 8), table_clusters);
BLKDBG_EVENT(s->hd, BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE);
ret = bdrv_pwrite(s->hd, offsetof(QCowHeader, refcount_table_offset),
BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE);
ret = bdrv_pwrite(bs->file, offsetof(QCowHeader, refcount_table_offset),
data, sizeof(data));
if (ret < 0) {
goto fail_table;
@ -398,9 +399,10 @@ fail_block:
}
#define REFCOUNTS_PER_SECTOR (512 >> REFCOUNT_SHIFT)
static int write_refcount_block_entries(BDRVQcowState *s,
static int write_refcount_block_entries(BlockDriverState *bs,
int64_t refcount_block_offset, int first_index, int last_index)
{
BDRVQcowState *s = bs->opaque;
size_t size;
if (cache_refcount_updates) {
@ -412,8 +414,8 @@ static int write_refcount_block_entries(BDRVQcowState *s,
& ~(REFCOUNTS_PER_SECTOR - 1);
size = (last_index - first_index) << REFCOUNT_SHIFT;
BLKDBG_EVENT(s->hd, BLKDBG_REFBLOCK_UPDATE_PART);
if (bdrv_pwrite(s->hd,
BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_UPDATE_PART);
if (bdrv_pwrite(bs->file,
refcount_block_offset + (first_index << REFCOUNT_SHIFT),
&s->refcount_block_cache[first_index], size) != size)
{
@ -458,7 +460,7 @@ static int QEMU_WARN_UNUSED_RESULT update_refcount(BlockDriverState *bs,
table_index = cluster_index >> (s->cluster_bits - REFCOUNT_SHIFT);
if ((old_table_index >= 0) && (table_index != old_table_index)) {
if (write_refcount_block_entries(s, refcount_block_offset,
if (write_refcount_block_entries(bs, refcount_block_offset,
first_index, last_index) < 0)
{
return -EIO;
@ -503,7 +505,7 @@ fail:
/* Write last changed block to disk */
if (refcount_block_offset != 0) {
if (write_refcount_block_entries(s, refcount_block_offset,
if (write_refcount_block_entries(bs, refcount_block_offset,
first_index, last_index) < 0)
{
return ret < 0 ? ret : -EIO;
@ -554,8 +556,8 @@ static int64_t alloc_clusters_noref(BlockDriverState *bs, int64_t size)
nb_clusters = size_to_clusters(s, size);
retry:
for(i = 0; i < nb_clusters; i++) {
int64_t i = s->free_cluster_index++;
if (get_refcount(bs, i) != 0)
int64_t next_cluster_index = s->free_cluster_index++;
if (get_refcount(bs, next_cluster_index) != 0)
goto retry;
}
#ifdef DEBUG_ALLOC2
@ -568,11 +570,10 @@ retry:
int64_t qcow2_alloc_clusters(BlockDriverState *bs, int64_t size)
{
BDRVQcowState *s = bs->opaque;
int64_t offset;
int ret;
BLKDBG_EVENT(s->hd, BLKDBG_CLUSTER_ALLOC);
BLKDBG_EVENT(bs->file, BLKDBG_CLUSTER_ALLOC);
offset = alloc_clusters_noref(bs, size);
ret = update_refcount(bs, offset, size, 1);
if (ret < 0) {
@ -589,7 +590,7 @@ int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size)
int64_t offset, cluster_offset;
int free_in_cluster;
BLKDBG_EVENT(s->hd, BLKDBG_CLUSTER_ALLOC_BYTES);
BLKDBG_EVENT(bs->file, BLKDBG_CLUSTER_ALLOC_BYTES);
assert(size > 0 && size <= s->cluster_size);
if (s->free_byte_offset == 0) {
s->free_byte_offset = qcow2_alloc_clusters(bs, s->cluster_size);
@ -631,14 +632,13 @@ int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size)
void qcow2_free_clusters(BlockDriverState *bs,
int64_t offset, int64_t size)
{
BDRVQcowState *s = bs->opaque;
int ret;
BLKDBG_EVENT(s->hd, BLKDBG_CLUSTER_FREE);
BLKDBG_EVENT(bs->file, BLKDBG_CLUSTER_FREE);
ret = update_refcount(bs, offset, size, -1);
if (ret < 0) {
fprintf(stderr, "qcow2_free_clusters failed: %s\n", strerror(-ret));
abort();
/* TODO Remember the clusters to free them later and avoid leaking */
}
}
@ -718,7 +718,7 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
l1_table = NULL;
}
l1_allocated = 1;
if (bdrv_pread(s->hd, l1_table_offset,
if (bdrv_pread(bs->file, l1_table_offset,
l1_table, l1_size2) != l1_size2)
goto fail;
for(i = 0;i < l1_size; i++)
@ -738,7 +738,7 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
old_l2_offset = l2_offset;
l2_offset &= ~QCOW_OFLAG_COPIED;
l2_modified = 0;
if (bdrv_pread(s->hd, l2_offset, l2_table, l2_size) != l2_size)
if (bdrv_pread(bs->file, l2_offset, l2_table, l2_size) != l2_size)
goto fail;
for(j = 0; j < s->l2_size; j++) {
offset = be64_to_cpu(l2_table[j]);
@ -777,7 +777,7 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
}
}
if (l2_modified) {
if (bdrv_pwrite(s->hd,
if (bdrv_pwrite(bs->file,
l2_offset, l2_table, l2_size) != l2_size)
goto fail;
}
@ -799,7 +799,7 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
if (l1_modified) {
for(i = 0; i < l1_size; i++)
cpu_to_be64s(&l1_table[i]);
if (bdrv_pwrite(s->hd, l1_table_offset, l1_table,
if (bdrv_pwrite(bs->file, l1_table_offset, l1_table,
l1_size2) != l1_size2)
goto fail;
for(i = 0; i < l1_size; i++)
@ -809,14 +809,14 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
qemu_free(l1_table);
qemu_free(l2_table);
cache_refcount_updates = 0;
write_refcount_block(s);
write_refcount_block(bs);
return 0;
fail:
if (l1_allocated)
qemu_free(l1_table);
qemu_free(l2_table);
cache_refcount_updates = 0;
write_refcount_block(s);
write_refcount_block(bs);
return -EIO;
}
@ -890,7 +890,7 @@ static int check_refcounts_l2(BlockDriverState *bs,
l2_size = s->l2_size * sizeof(uint64_t);
l2_table = qemu_malloc(l2_size);
if (bdrv_pread(s->hd, l2_offset, l2_table, l2_size) != l2_size)
if (bdrv_pread(bs->file, l2_offset, l2_table, l2_size) != l2_size)
goto fail;
/* Do the actual checks */
@ -982,7 +982,7 @@ static int check_refcounts_l1(BlockDriverState *bs,
l1_table = NULL;
} else {
l1_table = qemu_malloc(l1_size2);
if (bdrv_pread(s->hd, l1_table_offset,
if (bdrv_pread(bs->file, l1_table_offset,
l1_table, l1_size2) != l1_size2)
goto fail;
for(i = 0;i < l1_size; i++)
@ -1051,7 +1051,7 @@ int qcow2_check_refcounts(BlockDriverState *bs)
uint16_t *refcount_table;
int ret, errors = 0;
size = bdrv_getlength(s->hd);
size = bdrv_getlength(bs->file);
nb_clusters = size_to_clusters(s, size);
refcount_table = qemu_mallocz(nb_clusters * sizeof(uint16_t));

22
block/qcow2-snapshot.c
View File

@ -79,7 +79,7 @@ int qcow2_read_snapshots(BlockDriverState *bs)
s->snapshots = qemu_mallocz(s->nb_snapshots * sizeof(QCowSnapshot));
for(i = 0; i < s->nb_snapshots; i++) {
offset = align_offset(offset, 8);
if (bdrv_pread(s->hd, offset, &h, sizeof(h)) != sizeof(h))
if (bdrv_pread(bs->file, offset, &h, sizeof(h)) != sizeof(h))
goto fail;
offset += sizeof(h);
sn = s->snapshots + i;
@ -97,13 +97,13 @@ int qcow2_read_snapshots(BlockDriverState *bs)
offset += extra_data_size;
sn->id_str = qemu_malloc(id_str_size + 1);
if (bdrv_pread(s->hd, offset, sn->id_str, id_str_size) != id_str_size)
if (bdrv_pread(bs->file, offset, sn->id_str, id_str_size) != id_str_size)
goto fail;
offset += id_str_size;
sn->id_str[id_str_size] = '\0';
sn->name = qemu_malloc(name_size + 1);
if (bdrv_pread(s->hd, offset, sn->name, name_size) != name_size)
if (bdrv_pread(bs->file, offset, sn->name, name_size) != name_size)
goto fail;
offset += name_size;
sn->name[name_size] = '\0';
@ -158,24 +158,24 @@ static int qcow_write_snapshots(BlockDriverState *bs)
h.id_str_size = cpu_to_be16(id_str_size);
h.name_size = cpu_to_be16(name_size);
offset = align_offset(offset, 8);
if (bdrv_pwrite(s->hd, offset, &h, sizeof(h)) != sizeof(h))
if (bdrv_pwrite(bs->file, offset, &h, sizeof(h)) != sizeof(h))
goto fail;
offset += sizeof(h);
if (bdrv_pwrite(s->hd, offset, sn->id_str, id_str_size) != id_str_size)
if (bdrv_pwrite(bs->file, offset, sn->id_str, id_str_size) != id_str_size)
goto fail;
offset += id_str_size;
if (bdrv_pwrite(s->hd, offset, sn->name, name_size) != name_size)
if (bdrv_pwrite(bs->file, offset, sn->name, name_size) != name_size)
goto fail;
offset += name_size;
}
/* update the various header fields */
data64 = cpu_to_be64(snapshots_offset);
if (bdrv_pwrite(s->hd, offsetof(QCowHeader, snapshots_offset),
if (bdrv_pwrite(bs->file, offsetof(QCowHeader, snapshots_offset),
&data64, sizeof(data64)) != sizeof(data64))
goto fail;
data32 = cpu_to_be32(s->nb_snapshots);
if (bdrv_pwrite(s->hd, offsetof(QCowHeader, nb_snapshots),
if (bdrv_pwrite(bs->file, offsetof(QCowHeader, nb_snapshots),
&data32, sizeof(data32)) != sizeof(data32))
goto fail;
@ -284,7 +284,7 @@ int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
for(i = 0; i < s->l1_size; i++) {
l1_table[i] = cpu_to_be64(s->l1_table[i]);
}
if (bdrv_pwrite(s->hd, sn->l1_table_offset,
if (bdrv_pwrite(bs->file, sn->l1_table_offset,
l1_table, s->l1_size * sizeof(uint64_t)) !=
(s->l1_size * sizeof(uint64_t)))
goto fail;
@ -332,10 +332,10 @@ int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id)
s->l1_size = sn->l1_size;
l1_size2 = s->l1_size * sizeof(uint64_t);
/* copy the snapshot l1 table to the current l1 table */
if (bdrv_pread(s->hd, sn->l1_table_offset,
if (bdrv_pread(bs->file, sn->l1_table_offset,
s->l1_table, l1_size2) != l1_size2)
goto fail;
if (bdrv_pwrite(s->hd, s->l1_table_offset,
if (bdrv_pwrite(bs->file, s->l1_table_offset,
s->l1_table, l1_size2) != l1_size2)
goto fail;
for(i = 0;i < s->l1_size; i++) {

110
block/qcow2.c
View File

@ -77,7 +77,6 @@ static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename)
static int qcow_read_extensions(BlockDriverState *bs, uint64_t start_offset,
uint64_t end_offset)
{
BDRVQcowState *s = bs->opaque;
QCowExtension ext;
uint64_t offset;
@ -95,7 +94,7 @@ static int qcow_read_extensions(BlockDriverState *bs, uint64_t start_offset,
printf("attemting to read extended header in offset %lu\n", offset);
#endif
if (bdrv_pread(s->hd, offset, &ext, sizeof(ext)) != sizeof(ext)) {
if (bdrv_pread(bs->file, offset, &ext, sizeof(ext)) != sizeof(ext)) {
fprintf(stderr, "qcow_handle_extension: ERROR: pread fail from offset %llu\n",
(unsigned long long)offset);
return 1;
@ -117,7 +116,7 @@ static int qcow_read_extensions(BlockDriverState *bs, uint64_t start_offset,
ext.len, sizeof(bs->backing_format));
return 2;
}
if (bdrv_pread(s->hd, offset , bs->backing_format,
if (bdrv_pread(bs->file, offset , bs->backing_format,
ext.len) != ext.len)
return 3;
bs->backing_format[ext.len] = '\0';
@ -138,17 +137,14 @@ static int qcow_read_extensions(BlockDriverState *bs, uint64_t start_offset,
}
static int qcow_open(BlockDriverState *bs, const char *filename, int flags)
static int qcow_open(BlockDriverState *bs, int flags)
{
BDRVQcowState *s = bs->opaque;
int len, i, shift, ret;
int len, i;
QCowHeader header;
uint64_t ext_end;
ret = bdrv_file_open(&s->hd, filename, flags);
if (ret < 0)
return ret;
if (bdrv_pread(s->hd, 0, &header, sizeof(header)) != sizeof(header))
if (bdrv_pread(bs->file, 0, &header, sizeof(header)) != sizeof(header))
goto fail;
be32_to_cpus(&header.magic);
be32_to_cpus(&header.version);
@ -192,8 +188,7 @@ static int qcow_open(BlockDriverState *bs, const char *filename, int flags)
/* read the level 1 table */
s->l1_size = header.l1_size;
shift = s->cluster_bits + s->l2_bits;
s->l1_vm_state_index = (header.size + (1LL << shift) - 1) >> shift;
s->l1_vm_state_index = size_to_l1(s, header.size);
/* the L1 table must contain at least enough entries to put
header.size bytes */
if (s->l1_size < s->l1_vm_state_index)
@ -202,7 +197,7 @@ static int qcow_open(BlockDriverState *bs, const char *filename, int flags)
if (s->l1_size > 0) {
s->l1_table = qemu_mallocz(
align_offset(s->l1_size * sizeof(uint64_t), 512));
if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) !=
if (bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) !=
s->l1_size * sizeof(uint64_t))
goto fail;
for(i = 0;i < s->l1_size; i++) {
@ -235,7 +230,7 @@ static int qcow_open(BlockDriverState *bs, const char *filename, int flags)
len = header.backing_file_size;
if (len > 1023)
len = 1023;
if (bdrv_pread(s->hd, header.backing_file_offset, bs->backing_file, len) != len)
if (bdrv_pread(bs->file, header.backing_file_offset, bs->backing_file, len) != len)
goto fail;
bs->backing_file[len] = '\0';
}
@ -254,7 +249,6 @@ static int qcow_open(BlockDriverState *bs, const char *filename, int flags)
qemu_free(s->l2_cache);
qemu_free(s->cluster_cache);
qemu_free(s->cluster_data);
bdrv_delete(s->hd);
return -1;
}
@ -429,7 +423,7 @@ static void qcow_aio_read_cb(void *opaque, int ret)
acb->hd_iov.iov_base = (void *)acb->buf;
acb->hd_iov.iov_len = acb->cur_nr_sectors * 512;
qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
BLKDBG_EVENT(s->hd, BLKDBG_READ_BACKING_AIO);
BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
acb->hd_aiocb = bdrv_aio_readv(bs->backing_hd, acb->sector_num,
&acb->hd_qiov, acb->cur_nr_sectors,
qcow_aio_read_cb, acb);
@ -449,7 +443,7 @@ static void qcow_aio_read_cb(void *opaque, int ret)
}
} else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) {
/* add AIO support for compressed blocks ? */
if (qcow2_decompress_cluster(s, acb->cluster_offset) < 0)
if (qcow2_decompress_cluster(bs, acb->cluster_offset) < 0)
goto done;
memcpy(acb->buf, s->cluster_cache + index_in_cluster * 512,
512 * acb->cur_nr_sectors);
@ -465,8 +459,8 @@ static void qcow_aio_read_cb(void *opaque, int ret)
acb->hd_iov.iov_base = (void *)acb->buf;
acb->hd_iov.iov_len = acb->cur_nr_sectors * 512;
qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
BLKDBG_EVENT(s->hd, BLKDBG_READ_AIO);
acb->hd_aiocb = bdrv_aio_readv(s->hd,
BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
acb->hd_aiocb = bdrv_aio_readv(bs->file,
(acb->cluster_offset >> 9) + index_in_cluster,
&acb->hd_qiov, acb->cur_nr_sectors,
qcow_aio_read_cb, acb);
@ -615,8 +609,8 @@ static void qcow_aio_write_cb(void *opaque, int ret)
acb->hd_iov.iov_base = (void *)src_buf;
acb->hd_iov.iov_len = acb->cur_nr_sectors * 512;
qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
BLKDBG_EVENT(s->hd, BLKDBG_WRITE_AIO);
acb->hd_aiocb = bdrv_aio_writev(s->hd,
BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);
acb->hd_aiocb = bdrv_aio_writev(bs->file,
(acb->cluster_offset >> 9) + index_in_cluster,
&acb->hd_qiov, acb->cur_nr_sectors,
qcow_aio_write_cb, acb);
@ -663,7 +657,6 @@ static void qcow_close(BlockDriverState *bs)
qemu_free(s->cluster_cache);
qemu_free(s->cluster_data);
qcow2_refcount_close(bs);
bdrv_delete(s->hd);
}
/*
@ -733,7 +726,7 @@ static int qcow2_update_ext_header(BlockDriverState *bs,
backing_file_offset = sizeof(QCowHeader) + offset;
}
ret = bdrv_pwrite(s->hd, sizeof(QCowHeader), buf, ext_size);
ret = bdrv_pwrite(bs->file, sizeof(QCowHeader), buf, ext_size);
if (ret < 0) {
goto fail;
}
@ -742,13 +735,13 @@ static int qcow2_update_ext_header(BlockDriverState *bs,
uint64_t be_backing_file_offset = cpu_to_be64(backing_file_offset);
uint32_t be_backing_file_size = cpu_to_be32(backing_file_len);
ret = bdrv_pwrite(s->hd, offsetof(QCowHeader, backing_file_offset),
ret = bdrv_pwrite(bs->file, offsetof(QCowHeader, backing_file_offset),
&be_backing_file_offset, sizeof(uint64_t));
if (ret < 0) {
goto fail;
}
ret = bdrv_pwrite(s->hd, offsetof(QCowHeader, backing_file_size),
ret = bdrv_pwrite(bs->file, offsetof(QCowHeader, backing_file_size),
&be_backing_file_size, sizeof(uint32_t));
if (ret < 0) {
goto fail;
@ -789,7 +782,6 @@ static int get_bits_from_size(size_t size)
static int preallocate(BlockDriverState *bs)
{
BDRVQcowState *s = bs->opaque;
uint64_t nb_sectors;
uint64_t offset;
int num;
@ -832,7 +824,7 @@ static int preallocate(BlockDriverState *bs)
if (meta.cluster_offset != 0) {
uint8_t buf[512];
memset(buf, 0, 512);
bdrv_write(s->hd, (meta.cluster_offset >> 9) + num - 1, buf, 1);
bdrv_write(bs->file, (meta.cluster_offset >> 9) + num - 1, buf, 1);
}
return 0;
@ -847,9 +839,9 @@ static int qcow_make_empty(BlockDriverState *bs)
int ret;
memset(s->l1_table, 0, l1_length);
if (bdrv_pwrite(s->hd, s->l1_table_offset, s->l1_table, l1_length) < 0)
if (bdrv_pwrite(bs->file, s->l1_table_offset, s->l1_table, l1_length) < 0)
return -1;
ret = bdrv_truncate(s->hd, s->l1_table_offset + l1_length);
ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length);
if (ret < 0)
return ret;
@ -858,6 +850,43 @@ static int qcow_make_empty(BlockDriverState *bs)
return 0;
}
static int qcow2_truncate(BlockDriverState *bs, int64_t offset)
{
BDRVQcowState *s = bs->opaque;
int ret, new_l1_size;
if (offset & 511) {
return -EINVAL;
}
/* cannot proceed if image has snapshots */
if (s->nb_snapshots) {
return -ENOTSUP;
}
/* shrinking is currently not supported */
if (offset < bs->total_sectors * 512) {
return -ENOTSUP;
}
new_l1_size = size_to_l1(s, offset);
ret = qcow2_grow_l1_table(bs, new_l1_size);
if (ret < 0) {
return ret;
}
/* write updated header.size */
offset = cpu_to_be64(offset);
ret = bdrv_pwrite(bs->file, offsetof(QCowHeader, size),
&offset, sizeof(uint64_t));
if (ret < 0) {
return ret;
}
s->l1_vm_state_index = new_l1_size;
return 0;
}
/* XXX: put compressed sectors first, then all the cluster aligned
tables to avoid losing bytes in alignment */
static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
@ -872,9 +901,9 @@ static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
if (nb_sectors == 0) {
/* align end of file to a sector boundary to ease reading with
sector based I/Os */
cluster_offset = bdrv_getlength(s->hd);
cluster_offset = bdrv_getlength(bs->file);
cluster_offset = (cluster_offset + 511) & ~511;
bdrv_truncate(s->hd, cluster_offset);
bdrv_truncate(bs->file, cluster_offset);
return 0;
}
@ -917,8 +946,8 @@ static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
if (!cluster_offset)
return -1;
cluster_offset &= s->cluster_offset_mask;
BLKDBG_EVENT(s->hd, BLKDBG_WRITE_COMPRESSED);
if (bdrv_pwrite(s->hd, cluster_offset, out_buf, out_len) != out_len) {
BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED);
if (bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len) != out_len) {
qemu_free(out_buf);
return -1;
}
@ -930,16 +959,13 @@ static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
static void qcow_flush(BlockDriverState *bs)
{
BDRVQcowState *s = bs->opaque;
bdrv_flush(s->hd);
bdrv_flush(bs->file);
}
static BlockDriverAIOCB *qcow_aio_flush(BlockDriverState *bs,
BlockDriverCompletionFunc *cb, void *opaque)
{
BDRVQcowState *s = bs->opaque;
return bdrv_aio_flush(s->hd, cb, opaque);
return bdrv_aio_flush(bs->file, cb, opaque);
}
static int64_t qcow_vm_state_offset(BDRVQcowState *s)
@ -968,7 +994,7 @@ static void dump_refcounts(BlockDriverState *bs)
int64_t nb_clusters, k, k1, size;
int refcount;
size = bdrv_getlength(s->hd);
size = bdrv_getlength(bs->file);
nb_clusters = size_to_clusters(s, size);
for(k = 0; k < nb_clusters;) {
k1 = k;
@ -988,7 +1014,7 @@ static int qcow_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
int growable = bs->growable;
int ret;
BLKDBG_EVENT(s->hd, BLKDBG_VMSTATE_SAVE);
BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE);
bs->growable = 1;
ret = bdrv_pwrite(bs, qcow_vm_state_offset(s) + pos, buf, size);
bs->growable = growable;
@ -1003,7 +1029,7 @@ static int qcow_load_vmstate(BlockDriverState *bs, uint8_t *buf,
int growable = bs->growable;
int ret;
BLKDBG_EVENT(s->hd, BLKDBG_VMSTATE_LOAD);
BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD);
bs->growable = 1;
ret = bdrv_pread(bs, qcow_vm_state_offset(s) + pos, buf, size);
bs->growable = growable;
@ -1060,7 +1086,9 @@ static BlockDriver bdrv_qcow2 = {
.bdrv_aio_readv = qcow_aio_readv,
.bdrv_aio_writev = qcow_aio_writev,
.bdrv_aio_flush = qcow_aio_flush,
.bdrv_write_compressed = qcow_write_compressed,
.bdrv_truncate = qcow2_truncate,
.bdrv_write_compressed = qcow_write_compressed,
.bdrv_snapshot_create = qcow2_snapshot_create,
.bdrv_snapshot_goto = qcow2_snapshot_goto,

8
block/qcow2.h
View File

@ -150,6 +150,12 @@ static inline int size_to_clusters(BDRVQcowState *s, int64_t size)
return (size + (s->cluster_size - 1)) >> s->cluster_bits;
}
static inline int size_to_l1(BDRVQcowState *s, int64_t size)
{
int shift = s->cluster_bits + s->l2_bits;
return (size + (1ULL << shift) - 1) >> shift;
}
static inline int64_t align_offset(int64_t offset, int n)
{
offset = (offset + n - 1) & ~(n - 1);
@ -184,7 +190,7 @@ int qcow2_check_refcounts(BlockDriverState *bs);
/* qcow2-cluster.c functions */
int qcow2_grow_l1_table(BlockDriverState *bs, int min_size);
void qcow2_l2_cache_reset(BlockDriverState *bs);
int qcow2_decompress_cluster(BDRVQcowState *s, uint64_t cluster_offset);
int qcow2_decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset);
void qcow2_encrypt_sectors(BDRVQcowState *s, int64_t sector_num,
uint8_t *out_buf, const uint8_t *in_buf,
int nb_sectors, int enc,

62
block/raw-posix.c
View File

@ -105,7 +105,6 @@
typedef struct BDRVRawState {
int fd;
int type;
unsigned int lseek_err_cnt;
int open_flags;
#if defined(__linux__)
/* linux floppy specific */
@ -134,8 +133,6 @@ static int raw_open_common(BlockDriverState *bs, const char *filename,
BDRVRawState *s = bs->opaque;
int fd, ret;
s->lseek_err_cnt = 0;
s->open_flags = open_flags | O_BINARY;
s->open_flags &= ~O_ACCMODE;
if (bdrv_flags & BDRV_O_RDWR) {
@ -243,19 +240,7 @@ static int raw_pread_aligned(BlockDriverState *bs, int64_t offset,
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);
ret = pread(s->fd, buf, count, offset);
if (ret == count)
goto label__raw_read__success;
@ -276,12 +261,10 @@ static int raw_pread_aligned(BlockDriverState *bs, int64_t offset,
/* Try harder for CDrom. */
if (bs->type == BDRV_TYPE_CDROM) {
lseek(s->fd, offset, SEEK_SET);
ret = read(s->fd, buf, count);
ret = pread(s->fd, buf, count, offset);
if (ret == count)
goto label__raw_read__success;
lseek(s->fd, offset, SEEK_SET);
ret = read(s->fd, buf, count);
ret = pread(s->fd, buf, count, offset);
if (ret == count)
goto label__raw_read__success;
@ -313,19 +296,7 @@ static int raw_pwrite_aligned(BlockDriverState *bs, int64_t offset,
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);
ret = pwrite(s->fd, buf, count, offset);
if (ret == count)
goto label__raw_write__success;
@ -768,11 +739,12 @@ static QEMUOptionParameter raw_create_options[] = {
{ NULL }
};
static BlockDriver bdrv_raw = {
.format_name = "raw",
static BlockDriver bdrv_file = {
.format_name = "file",
.protocol_name = "file",
.instance_size = sizeof(BDRVRawState),
.bdrv_probe = NULL, /* no probe for protocols */
.bdrv_open = raw_open,
.bdrv_file_open = raw_open,
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_close = raw_close,
@ -1026,9 +998,10 @@ static int hdev_create(const char *filename, QEMUOptionParameter *options)
static BlockDriver bdrv_host_device = {
.format_name = "host_device",
.protocol_name = "host_device",
.instance_size = sizeof(BDRVRawState),
.bdrv_probe_device = hdev_probe_device,
.bdrv_open = hdev_open,
.bdrv_file_open = hdev_open,
.bdrv_close = raw_close,
.bdrv_create = hdev_create,
.create_options = raw_create_options,
@ -1140,9 +1113,10 @@ static int floppy_eject(BlockDriverState *bs, int eject_flag)
static BlockDriver bdrv_host_floppy = {
.format_name = "host_floppy",
.protocol_name = "host_floppy",
.instance_size = sizeof(BDRVRawState),
.bdrv_probe_device = floppy_probe_device,
.bdrv_open = floppy_open,
.bdrv_file_open = floppy_open,
.bdrv_close = raw_close,
.bdrv_create = hdev_create,
.create_options = raw_create_options,
@ -1239,9 +1213,10 @@ static int cdrom_set_locked(BlockDriverState *bs, int locked)
static BlockDriver bdrv_host_cdrom = {
.format_name = "host_cdrom",
.protocol_name = "host_cdrom",
.instance_size = sizeof(BDRVRawState),
.bdrv_probe_device = cdrom_probe_device,
.bdrv_open = cdrom_open,
.bdrv_file_open = cdrom_open,
.bdrv_close = raw_close,
.bdrv_create = hdev_create,
.create_options = raw_create_options,
@ -1361,9 +1336,10 @@ static int cdrom_set_locked(BlockDriverState *bs, int locked)
static BlockDriver bdrv_host_cdrom = {
.format_name = "host_cdrom",
.protocol_name = "host_cdrom",
.instance_size = sizeof(BDRVRawState),
.bdrv_probe_device = cdrom_probe_device,
.bdrv_open = cdrom_open,
.bdrv_file_open = cdrom_open,
.bdrv_close = raw_close,
.bdrv_create = hdev_create,
.create_options = raw_create_options,
@ -1385,13 +1361,13 @@ static BlockDriver bdrv_host_cdrom = {
};
#endif /* __FreeBSD__ */
static void bdrv_raw_init(void)
static void bdrv_file_init(void)
{
/*
* Register all the drivers. Note that order is important, the driver
* registered last will get probed first.
*/
bdrv_register(&bdrv_raw);
bdrv_register(&bdrv_file);
bdrv_register(&bdrv_host_device);
#ifdef __linux__
bdrv_register(&bdrv_host_floppy);
@ -1402,4 +1378,4 @@ static void bdrv_raw_init(void)
#endif
}
block_init(bdrv_raw_init);
block_init(bdrv_file_init);

16
block/raw-win32.c
View File

@ -238,10 +238,11 @@ static QEMUOptionParameter raw_create_options[] = {
{ NULL }
};
static BlockDriver bdrv_raw = {
.format_name = "raw",
static BlockDriver bdrv_file = {
.format_name = "file",
.protocol_name = "file",
.instance_size = sizeof(BDRVRawState),
.bdrv_open = raw_open,
.bdrv_file_open = raw_open,
.bdrv_close = raw_close,
.bdrv_create = raw_create,
.bdrv_flush = raw_flush,
@ -395,9 +396,10 @@ static int raw_set_locked(BlockDriverState *bs, int locked)
static BlockDriver bdrv_host_device = {
.format_name = "host_device",
.protocol_name = "host_device",
.instance_size = sizeof(BDRVRawState),
.bdrv_probe_device = hdev_probe_device,
.bdrv_open = hdev_open,
.bdrv_file_open = hdev_open,
.bdrv_close = raw_close,
.bdrv_flush = raw_flush,
@ -406,10 +408,10 @@ static BlockDriver bdrv_host_device = {
.bdrv_getlength = raw_getlength,
};
static void bdrv_raw_init(void)
static void bdrv_file_init(void)
{
bdrv_register(&bdrv_raw);
bdrv_register(&bdrv_file);
bdrv_register(&bdrv_host_device);
}
block_init(bdrv_raw_init);
block_init(bdrv_file_init);

144
block/raw.c Normal file
View File

@ -0,0 +1,144 @@
#include "qemu-common.h"
#include "block_int.h"
#include "module.h"
static int raw_open(BlockDriverState *bs, int flags)
{
bs->sg = bs->file->sg;
return 0;
}
static int raw_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
return bdrv_read(bs->file, sector_num, buf, nb_sectors);
}
static int raw_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
return bdrv_write(bs->file, sector_num, buf, nb_sectors);
}
static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque)
{
return bdrv_aio_readv(bs->file, sector_num, qiov, nb_sectors, cb, opaque);
}
static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque)
{
return bdrv_aio_writev(bs->file, sector_num, qiov, nb_sectors, cb, opaque);
}
static void raw_close(BlockDriverState *bs)
{
}
static void raw_flush(BlockDriverState *bs)
{
bdrv_flush(bs->file);
}
static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
BlockDriverCompletionFunc *cb, void *opaque)
{
return bdrv_aio_flush(bs->file, cb, opaque);
}
static int64_t raw_getlength(BlockDriverState *bs)
{
return bdrv_getlength(bs->file);
}
static int raw_truncate(BlockDriverState *bs, int64_t offset)
{
return bdrv_truncate(bs->file, offset);
}
static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)
{
return 1; /* everything can be opened as raw image */
}
static int raw_is_inserted(BlockDriverState *bs)
{
return bdrv_is_inserted(bs->file);
}
static int raw_eject(BlockDriverState *bs, int eject_flag)
{
return bdrv_eject(bs->file, eject_flag);
}
static int raw_set_locked(BlockDriverState *bs, int locked)
{
bdrv_set_locked(bs->file, locked);
return 0;
}
static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
{
return bdrv_ioctl(bs->file, req, buf);
}
static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
unsigned long int req, void *buf,
BlockDriverCompletionFunc *cb, void *opaque)
{
return bdrv_aio_ioctl(bs->file, req, buf, cb, opaque);
}
static int raw_create(const char *filename, QEMUOptionParameter *options)
{
return bdrv_create_file(filename, options);
}
static QEMUOptionParameter raw_create_options[] = {
{
.name = BLOCK_OPT_SIZE,
.type = OPT_SIZE,
.help = "Virtual disk size"
},
{ NULL }
};
static BlockDriver bdrv_raw = {
.format_name = "raw",
/* It's really 0, but we need to make qemu_malloc() happy */
.instance_size = 1,
.bdrv_open = raw_open,
.bdrv_close = raw_close,
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_flush = raw_flush,
.bdrv_probe = raw_probe,
.bdrv_getlength = raw_getlength,
.bdrv_truncate = raw_truncate,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_is_inserted = raw_is_inserted,
.bdrv_eject = raw_eject,
.bdrv_set_locked = raw_set_locked,
.bdrv_ioctl = raw_ioctl,
.bdrv_aio_ioctl = raw_aio_ioctl,
.bdrv_create = raw_create,
.create_options = raw_create_options,
};
static void bdrv_raw_init(void)
{
bdrv_register(&bdrv_raw);
}
block_init(bdrv_raw_init);

29
block/vdi.c
View File

@ -376,21 +376,15 @@ static int vdi_probe(const uint8_t *buf, int buf_size, const char *filename)
return result;
}
static int vdi_open(BlockDriverState *bs, const char *filename, int flags)
static int vdi_open(BlockDriverState *bs, int flags)
{
BDRVVdiState *s = bs->opaque;
VdiHeader header;
size_t bmap_size;
int ret;
logout("\n");
ret = bdrv_file_open(&s->hd, filename, flags);
if (ret < 0) {
return ret;
}
if (bdrv_read(s->hd, 0, (uint8_t *)&header, 1) < 0) {
if (bdrv_read(bs->file, 0, (uint8_t *)&header, 1) < 0) {
goto fail;
}
@ -442,7 +436,7 @@ static int vdi_open(BlockDriverState *bs, const char *filename, int flags)
bmap_size = header.blocks_in_image * sizeof(uint32_t);
bmap_size = (bmap_size + SECTOR_SIZE - 1) / SECTOR_SIZE;
s->bmap = qemu_malloc(bmap_size * SECTOR_SIZE);
if (bdrv_read(s->hd, s->bmap_sector, (uint8_t *)s->bmap, bmap_size) < 0) {
if (bdrv_read(bs->file, s->bmap_sector, (uint8_t *)s->bmap, bmap_size) < 0) {
goto fail_free_bmap;
}
@ -452,7 +446,6 @@ static int vdi_open(BlockDriverState *bs, const char *filename, int flags)
qemu_free(s->bmap);
fail:
bdrv_delete(s->hd);
return -1;
}
@ -607,7 +600,7 @@ static void vdi_aio_read_cb(void *opaque, int ret)
acb->hd_iov.iov_base = (void *)acb->buf;
acb->hd_iov.iov_len = n_sectors * SECTOR_SIZE;
qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
acb->hd_aiocb = bdrv_aio_readv(s->hd, offset, &acb->hd_qiov,
acb->hd_aiocb = bdrv_aio_readv(bs->file, offset, &acb->hd_qiov,
n_sectors, vdi_aio_read_cb, acb);
if (acb->hd_aiocb == NULL) {
goto done;
@ -670,7 +663,7 @@ static void vdi_aio_write_cb(void *opaque, int ret)
acb->hd_iov.iov_base = acb->block_buffer;
acb->hd_iov.iov_len = SECTOR_SIZE;
qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
acb->hd_aiocb = bdrv_aio_writev(s->hd, 0, &acb->hd_qiov, 1,
acb->hd_aiocb = bdrv_aio_writev(bs->file, 0, &acb->hd_qiov, 1,
vdi_aio_write_cb, acb);
if (acb->hd_aiocb == NULL) {
goto done;
@ -699,7 +692,7 @@ static void vdi_aio_write_cb(void *opaque, int ret)
qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
logout("will write %u block map sectors starting from entry %u\n",
n_sectors, bmap_first);
acb->hd_aiocb = bdrv_aio_writev(s->hd, offset, &acb->hd_qiov,
acb->hd_aiocb = bdrv_aio_writev(bs->file, offset, &acb->hd_qiov,
n_sectors, vdi_aio_write_cb, acb);
if (acb->hd_aiocb == NULL) {
goto done;
@ -748,7 +741,7 @@ static void vdi_aio_write_cb(void *opaque, int ret)
acb->hd_iov.iov_base = (void *)block;
acb->hd_iov.iov_len = s->block_size;
qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
acb->hd_aiocb = bdrv_aio_writev(s->hd, offset,
acb->hd_aiocb = bdrv_aio_writev(bs->file, offset,
&acb->hd_qiov, s->block_sectors,
vdi_aio_write_cb, acb);
if (acb->hd_aiocb == NULL) {
@ -761,7 +754,7 @@ static void vdi_aio_write_cb(void *opaque, int ret)
acb->hd_iov.iov_base = (void *)acb->buf;
acb->hd_iov.iov_len = n_sectors * SECTOR_SIZE;
qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
acb->hd_aiocb = bdrv_aio_writev(s->hd, offset, &acb->hd_qiov,
acb->hd_aiocb = bdrv_aio_writev(bs->file, offset, &acb->hd_qiov,
n_sectors, vdi_aio_write_cb, acb);
if (acb->hd_aiocb == NULL) {
goto done;
@ -891,16 +884,12 @@ static int vdi_create(const char *filename, QEMUOptionParameter *options)
static void vdi_close(BlockDriverState *bs)
{
BDRVVdiState *s = bs->opaque;
logout("\n");
bdrv_delete(s->hd);
}
static void vdi_flush(BlockDriverState *bs)
{
BDRVVdiState *s = bs->opaque;
logout("\n");
bdrv_flush(s->hd);
bdrv_flush(bs->file);
}

140
block/vmdk.c
View File

@ -76,7 +76,6 @@ typedef struct BDRVVmdkState {
unsigned int cluster_sectors;
uint32_t parent_cid;
int is_parent;
} BDRVVmdkState;
typedef struct VmdkMetaData {
@ -87,14 +86,6 @@ typedef struct VmdkMetaData {
int valid;
} VmdkMetaData;
typedef struct ActiveBDRVState{
BlockDriverState *hd; // active image handler
uint64_t cluster_offset; // current write offset
}ActiveBDRVState;
static ActiveBDRVState activeBDRV;
static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename)
{
uint32_t magic;
@ -117,14 +108,13 @@ static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename)
static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent)
{
BDRVVmdkState *s = bs->opaque;
char desc[DESC_SIZE];
uint32_t cid;
const char *p_name, *cid_str;
size_t cid_str_size;
/* the descriptor offset = 0x200 */
if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE)
if (bdrv_pread(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE)
return 0;
if (parent) {
@ -145,12 +135,11 @@ static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent)
static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid)
{
BDRVVmdkState *s = bs->opaque;
char desc[DESC_SIZE], tmp_desc[DESC_SIZE];
char *p_name, *tmp_str;
/* the descriptor offset = 0x200 */
if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE)
if (bdrv_pread(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE)
return -1;
tmp_str = strstr(desc,"parentCID");
@ -161,7 +150,7 @@ static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid)
pstrcat(desc, sizeof(desc), tmp_desc);
}
if (bdrv_pwrite(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE)
if (bdrv_pwrite(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE)
return -1;
return 0;
}
@ -346,27 +335,17 @@ fail:
return ret;
}
static void vmdk_parent_close(BlockDriverState *bs)
static int vmdk_parent_open(BlockDriverState *bs)
{
if (bs->backing_hd)
bdrv_close(bs->backing_hd);
}
static int parent_open = 0;
static int vmdk_parent_open(BlockDriverState *bs, const char * filename)
{
BDRVVmdkState *s = bs->opaque;
char *p_name;
char desc[DESC_SIZE];
char parent_img_name[1024];
/* the descriptor offset = 0x200 */
if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE)
if (bdrv_pread(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE)
return -1;
if ((p_name = strstr(desc,"parentFileNameHint")) != NULL) {
char *end_name;
struct stat file_buf;
p_name += sizeof("parentFileNameHint") + 1;
if ((end_name = strchr(p_name,'\"')) == NULL)
@ -375,51 +354,25 @@ static int vmdk_parent_open(BlockDriverState *bs, const char * filename)
return -1;
pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
if (stat(bs->backing_file, &file_buf) != 0) {
path_combine(parent_img_name, sizeof(parent_img_name),
filename, bs->backing_file);
} else {
pstrcpy(parent_img_name, sizeof(parent_img_name),
bs->backing_file);
}
bs->backing_hd = bdrv_new("");
if (!bs->backing_hd) {
failure:
bdrv_close(s->hd);
return -1;
}
parent_open = 1;
if (bdrv_open(bs->backing_hd, parent_img_name, 0, NULL) < 0)
goto failure;
parent_open = 0;
}
return 0;
}
static int vmdk_open(BlockDriverState *bs, const char *filename, int flags)
static int vmdk_open(BlockDriverState *bs, int flags)
{
BDRVVmdkState *s = bs->opaque;
uint32_t magic;
int l1_size, i, ret;
int l1_size, i;
if (parent_open) {
/* Parent must be opened as RO, no RDWR. */
flags = 0;
}
ret = bdrv_file_open(&s->hd, filename, flags);
if (ret < 0)
return ret;
if (bdrv_pread(s->hd, 0, &magic, sizeof(magic)) != sizeof(magic))
if (bdrv_pread(bs->file, 0, &magic, sizeof(magic)) != sizeof(magic))
goto fail;
magic = be32_to_cpu(magic);
if (magic == VMDK3_MAGIC) {
VMDK3Header header;
if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header))
if (bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header)) != sizeof(header))
goto fail;
s->cluster_sectors = le32_to_cpu(header.granularity);
s->l2_size = 1 << 9;
@ -431,7 +384,7 @@ static int vmdk_open(BlockDriverState *bs, const char *filename, int flags)
} else if (magic == VMDK4_MAGIC) {
VMDK4Header header;
if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header))
if (bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header)) != sizeof(header))
goto fail;
bs->total_sectors = le64_to_cpu(header.capacity);
s->cluster_sectors = le64_to_cpu(header.granularity);
@ -444,13 +397,8 @@ static int vmdk_open(BlockDriverState *bs, const char *filename, int flags)
s->l1_table_offset = le64_to_cpu(header.rgd_offset) << 9;
s->l1_backup_table_offset = le64_to_cpu(header.gd_offset) << 9;
if (parent_open)
s->is_parent = 1;
else
s->is_parent = 0;
// try to open parent images, if exist
if (vmdk_parent_open(bs, filename) != 0)
if (vmdk_parent_open(bs) != 0)
goto fail;
// write the CID once after the image creation
s->parent_cid = vmdk_read_cid(bs,1);
@ -461,7 +409,7 @@ static int vmdk_open(BlockDriverState *bs, const char *filename, int flags)
/* read the L1 table */
l1_size = s->l1_size * sizeof(uint32_t);
s->l1_table = qemu_malloc(l1_size);
if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, l1_size) != l1_size)
if (bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, l1_size) != l1_size)
goto fail;
for(i = 0; i < s->l1_size; i++) {
le32_to_cpus(&s->l1_table[i]);
@ -469,7 +417,7 @@ static int vmdk_open(BlockDriverState *bs, const char *filename, int flags)
if (s->l1_backup_table_offset) {
s->l1_backup_table = qemu_malloc(l1_size);
if (bdrv_pread(s->hd, s->l1_backup_table_offset, s->l1_backup_table, l1_size) != l1_size)
if (bdrv_pread(bs->file, s->l1_backup_table_offset, s->l1_backup_table, l1_size) != l1_size)
goto fail;
for(i = 0; i < s->l1_size; i++) {
le32_to_cpus(&s->l1_backup_table[i]);
@ -482,7 +430,6 @@ static int vmdk_open(BlockDriverState *bs, const char *filename, int flags)
qemu_free(s->l1_backup_table);
qemu_free(s->l1_table);
qemu_free(s->l2_cache);
bdrv_delete(s->hd);
return -1;
}
@ -492,30 +439,28 @@ static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data,
static int get_whole_cluster(BlockDriverState *bs, uint64_t cluster_offset,
uint64_t offset, int allocate)
{
uint64_t parent_cluster_offset;
BDRVVmdkState *s = bs->opaque;
uint8_t whole_grain[s->cluster_sectors*512]; // 128 sectors * 512 bytes each = grain size 64KB
// we will be here if it's first write on non-exist grain(cluster).
// try to read from parent image, if exist
if (bs->backing_hd) {
BDRVVmdkState *ps = bs->backing_hd->opaque;
int ret;
if (!vmdk_is_cid_valid(bs))
return -1;
parent_cluster_offset = get_cluster_offset(bs->backing_hd, NULL,
offset, allocate);
ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain,
s->cluster_sectors);
if (ret < 0) {
return -1;
}
if (parent_cluster_offset) {
BDRVVmdkState *act_s = activeBDRV.hd->opaque;
if (bdrv_pread(ps->hd, parent_cluster_offset, whole_grain, ps->cluster_sectors*512) != ps->cluster_sectors*512)
return -1;
//Write grain only into the active image
if (bdrv_pwrite(act_s->hd, activeBDRV.cluster_offset << 9, whole_grain, sizeof(whole_grain)) != sizeof(whole_grain))
return -1;
//Write grain only into the active image
ret = bdrv_write(bs->file, cluster_offset, whole_grain,
s->cluster_sectors);
if (ret < 0) {
return -1;
}
}
return 0;
@ -526,13 +471,13 @@ static int vmdk_L2update(BlockDriverState *bs, VmdkMetaData *m_data)
BDRVVmdkState *s = bs->opaque;
/* update L2 table */
if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)),
if (bdrv_pwrite(bs->file, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)),
&(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset))
return -1;
/* update backup L2 table */
if (s->l1_backup_table_offset != 0) {
m_data->l2_offset = s->l1_backup_table[m_data->l1_index];
if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)),
if (bdrv_pwrite(bs->file, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)),
&(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset))
return -1;
}
@ -580,7 +525,7 @@ static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data,
}
}
l2_table = s->l2_cache + (min_index * s->l2_size);
if (bdrv_pread(s->hd, (int64_t)l2_offset * 512, l2_table, s->l2_size * sizeof(uint32_t)) !=
if (bdrv_pread(bs->file, (int64_t)l2_offset * 512, l2_table, s->l2_size * sizeof(uint32_t)) !=
s->l2_size * sizeof(uint32_t))
return 0;
@ -593,18 +538,15 @@ static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data,
if (!cluster_offset) {
if (!allocate)
return 0;
// Avoid the L2 tables update for the images that have snapshots.
if (!s->is_parent) {
cluster_offset = bdrv_getlength(s->hd);
bdrv_truncate(s->hd, cluster_offset + (s->cluster_sectors << 9));
cluster_offset >>= 9;
tmp = cpu_to_le32(cluster_offset);
l2_table[l2_index] = tmp;
// Save the active image state
activeBDRV.cluster_offset = cluster_offset;
activeBDRV.hd = bs;
}
// Avoid the L2 tables update for the images that have snapshots.
cluster_offset = bdrv_getlength(bs->file);
bdrv_truncate(bs->file, cluster_offset + (s->cluster_sectors << 9));
cluster_offset >>= 9;
tmp = cpu_to_le32(cluster_offset);
l2_table[l2_index] = tmp;
/* First of all we write grain itself, to avoid race condition
* that may to corrupt the image.
* This problem may occur because of insufficient space on host disk
@ -666,7 +608,7 @@ static int vmdk_read(BlockDriverState *bs, int64_t sector_num,
memset(buf, 0, 512 * n);
}
} else {
if(bdrv_pread(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512)
if(bdrv_pread(bs->file, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512)
return -1;
}
nb_sectors -= n;
@ -702,7 +644,7 @@ static int vmdk_write(BlockDriverState *bs, int64_t sector_num,
if (!cluster_offset)
return -1;
if (bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512)
if (bdrv_pwrite(bs->file, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512)
return -1;
if (m_data.valid) {
/* update L2 tables */
@ -879,15 +821,11 @@ static void vmdk_close(BlockDriverState *bs)
qemu_free(s->l1_table);
qemu_free(s->l2_cache);
// try to close parent image, if exist
vmdk_parent_close(s->hd);
bdrv_delete(s->hd);
}
static void vmdk_flush(BlockDriverState *bs)
{
BDRVVmdkState *s = bs->opaque;
bdrv_flush(s->hd);
bdrv_flush(bs->file);
}
@ -914,7 +852,7 @@ static BlockDriver bdrv_vmdk = {
.format_name = "vmdk",
.instance_size = sizeof(BDRVVmdkState),
.bdrv_probe = vmdk_probe,
.bdrv_open = vmdk_open,
.bdrv_open = vmdk_open,
.bdrv_read = vmdk_read,
.bdrv_write = vmdk_write,
.bdrv_close = vmdk_close,

32
block/vpc.c
View File

@ -150,20 +150,16 @@ static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename)
return 0;
}
static int vpc_open(BlockDriverState *bs, const char *filename, int flags)
static int vpc_open(BlockDriverState *bs, int flags)
{
BDRVVPCState *s = bs->opaque;
int ret, i;
int i;
struct vhd_footer* footer;
struct vhd_dyndisk_header* dyndisk_header;
uint8_t buf[HEADER_SIZE];
uint32_t checksum;
ret = bdrv_file_open(&s->hd, filename, flags);
if (ret < 0)
return ret;
if (bdrv_pread(s->hd, 0, s->footer_buf, HEADER_SIZE) != HEADER_SIZE)
if (bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE) != HEADER_SIZE)
goto fail;
footer = (struct vhd_footer*) s->footer_buf;
@ -174,7 +170,7 @@ static int vpc_open(BlockDriverState *bs, const char *filename, int flags)
footer->checksum = 0;
if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum)
fprintf(stderr, "block-vpc: The header checksum of '%s' is "
"incorrect.\n", filename);
"incorrect.\n", bs->filename);
// The visible size of a image in Virtual PC depends on the geometry
// rather than on the size stored in the footer (the size in the footer
@ -182,7 +178,7 @@ static int vpc_open(BlockDriverState *bs, const char *filename, int flags)
bs->total_sectors = (int64_t)
be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl;
if (bdrv_pread(s->hd, be64_to_cpu(footer->data_offset), buf, HEADER_SIZE)
if (bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf, HEADER_SIZE)
!= HEADER_SIZE)
goto fail;
@ -199,7 +195,7 @@ static int vpc_open(BlockDriverState *bs, const char *filename, int flags)
s->pagetable = qemu_malloc(s->max_table_entries * 4);
s->bat_offset = be64_to_cpu(dyndisk_header->table_offset);
if (bdrv_pread(s->hd, s->bat_offset, s->pagetable,
if (bdrv_pread(bs->file, s->bat_offset, s->pagetable,
s->max_table_entries * 4) != s->max_table_entries * 4)
goto fail;
@ -228,7 +224,6 @@ static int vpc_open(BlockDriverState *bs, const char *filename, int flags)
return 0;
fail:
bdrv_delete(s->hd);
return -1;
}
@ -266,7 +261,7 @@ static inline int64_t get_sector_offset(BlockDriverState *bs,
s->last_bitmap_offset = bitmap_offset;
memset(bitmap, 0xff, s->bitmap_size);
bdrv_pwrite(s->hd, bitmap_offset, bitmap, s->bitmap_size);
bdrv_pwrite(bs->file, bitmap_offset, bitmap, s->bitmap_size);
}
// printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n",
@ -316,7 +311,7 @@ static int rewrite_footer(BlockDriverState* bs)
BDRVVPCState *s = bs->opaque;
int64_t offset = s->free_data_block_offset;
ret = bdrv_pwrite(s->hd, offset, s->footer_buf, HEADER_SIZE);
ret = bdrv_pwrite(bs->file, offset, s->footer_buf, HEADER_SIZE);
if (ret < 0)
return ret;
@ -351,7 +346,7 @@ static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num)
// Initialize the block's bitmap
memset(bitmap, 0xff, s->bitmap_size);
bdrv_pwrite(s->hd, s->free_data_block_offset, bitmap, s->bitmap_size);
bdrv_pwrite(bs->file, s->free_data_block_offset, bitmap, s->bitmap_size);
// Write new footer (the old one will be overwritten)
s->free_data_block_offset += s->block_size + s->bitmap_size;
@ -362,7 +357,7 @@ static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num)
// Write BAT entry to disk
bat_offset = s->bat_offset + (4 * index);
bat_value = be32_to_cpu(s->pagetable[index]);
ret = bdrv_pwrite(s->hd, bat_offset, &bat_value, 4);
ret = bdrv_pwrite(bs->file, bat_offset, &bat_value, 4);
if (ret < 0)
goto fail;
@ -376,7 +371,6 @@ fail:
static int vpc_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
BDRVVPCState *s = bs->opaque;
int ret;
int64_t offset;
@ -386,7 +380,7 @@ static int vpc_read(BlockDriverState *bs, int64_t sector_num,
if (offset == -1) {
memset(buf, 0, 512);
} else {
ret = bdrv_pread(s->hd, offset, buf, 512);
ret = bdrv_pread(bs->file, offset, buf, 512);
if (ret != 512)
return -1;
}
@ -401,7 +395,6 @@ static int vpc_read(BlockDriverState *bs, int64_t sector_num,
static int vpc_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
BDRVVPCState *s = bs->opaque;
int64_t offset;
int ret;
@ -414,7 +407,7 @@ static int vpc_write(BlockDriverState *bs, int64_t sector_num,
return -1;
}
ret = bdrv_pwrite(s->hd, offset, buf, 512);
ret = bdrv_pwrite(bs->file, offset, buf, 512);
if (ret != 512)
return -1;
@ -590,7 +583,6 @@ static void vpc_close(BlockDriverState *bs)
#ifdef CACHE
qemu_free(s->pageentry_u8);
#endif
bdrv_delete(s->hd);
}
static QEMUOptionParameter vpc_create_options[] = {

2
block/vvfat.c
View File

@ -2827,7 +2827,7 @@ static void vvfat_close(BlockDriverState *bs)
static BlockDriver bdrv_vvfat = {
.format_name = "vvfat",
.instance_size = sizeof(BDRVVVFATState),
.bdrv_open = vvfat_open,
.bdrv_file_open = vvfat_open,
.bdrv_read = vvfat_read,
.bdrv_write = vvfat_write,
.bdrv_close = vvfat_close,

6
block_int.h
View File

@ -51,7 +51,8 @@ struct BlockDriver {
int instance_size;
int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);
int (*bdrv_probe_device)(const char *filename);
int (*bdrv_open)(BlockDriverState *bs, const char *filename, int flags);
int (*bdrv_open)(BlockDriverState *bs, int flags);
int (*bdrv_file_open)(BlockDriverState *bs, const char *filename, int flags);
int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors);
int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,
@ -155,6 +156,8 @@ struct BlockDriverState {
int media_changed;
BlockDriverState *backing_hd;
BlockDriverState *file;
/* async read/write emulation */
void *sync_aiocb;
@ -164,6 +167,7 @@ struct BlockDriverState {
uint64_t wr_bytes;
uint64_t rd_ops;
uint64_t wr_ops;
uint64_t wr_highest_sector;
/* Whether the disk can expand beyond total_sectors */
int growable;

6
qemu-img-cmds.hx
View File

@ -49,5 +49,11 @@ DEF("rebase", img_rebase,
"rebase [-f fmt] [-u] -b backing_file [-F backing_fmt] filename")
STEXI
@item rebase [-f @var{fmt}] [-u] -b @var{backing_file} [-F @var{backing_fmt}] @var{filename}
ETEXI
DEF("resize", img_resize,
"resize filename [+ | -]size")
STEXI
@item rebase @var{filename} [+ | -]@var{size}
@end table
ETEXI

104
qemu-img.c
View File

@ -732,6 +732,8 @@ static int img_convert(int argc, char **argv)
/* signal EOF to align */
bdrv_write_compressed(out_bs, 0, NULL, 0);
} else {
int has_zero_init = bdrv_has_zero_init(out_bs);
sector_num = 0; // total number of sectors converted so far
for(;;) {
nb_sectors = total_sectors - sector_num;
@ -755,7 +757,7 @@ static int img_convert(int argc, char **argv)
if (n > bs_offset + bs_sectors - sector_num)
n = bs_offset + bs_sectors - sector_num;
if (!drv->no_zero_init) {
if (has_zero_init) {
/* If the output image is being created as a copy on write image,
assume that sectors which are unallocated in the input image
are present in both the output's and input's base images (no
@ -788,7 +790,7 @@ static int img_convert(int argc, char **argv)
If the output is to a host device, we also write out
sectors that are entirely 0, since whatever data was
already there is garbage, not 0s. */
if (drv->no_zero_init || out_baseimg ||
if (!has_zero_init || out_baseimg ||
is_allocated_sectors(buf1, n, &n1)) {
if (bdrv_write(out_bs, sector_num, buf1, n1) < 0)
error("error while writing");
@ -1134,7 +1136,7 @@ static int img_rebase(int argc, char **argv)
if (!unsafe) {
uint64_t num_sectors;
uint64_t sector;
int n, n1;
int n;
uint8_t * buf_old;
uint8_t * buf_new;
@ -1153,8 +1155,8 @@ static int img_rebase(int argc, char **argv)
}
/* If the cluster is allocated, we don't need to take action */
if (bdrv_is_allocated(bs, sector, n, &n1)) {
n = n1;
ret = bdrv_is_allocated(bs, sector, n, &n);
if (ret) {
continue;
}
@ -1223,6 +1225,98 @@ static int img_rebase(int argc, char **argv)
return 0;
}
static int img_resize(int argc, char **argv)
{
int c, ret, relative;
const char *filename, *fmt, *size;
int64_t n, total_size;
BlockDriverState *bs;
QEMUOptionParameter *param;
QEMUOptionParameter resize_options[] = {
{
.name = BLOCK_OPT_SIZE,
.type = OPT_SIZE,
.help = "Virtual disk size"
},
{ NULL }
};
fmt = NULL;
for(;;) {
c = getopt(argc, argv, "f:h");
if (c == -1) {
break;
}
switch(c) {
case 'h':
help();
break;
case 'f':
fmt = optarg;
break;
}
}
if (optind + 1 >= argc) {
help();
}
filename = argv[optind++];
size = argv[optind++];
/* Choose grow, shrink, or absolute resize mode */
switch (size[0]) {
case '+':
relative = 1;
size++;
break;
case '-':
relative = -1;
size++;
break;
default:
relative = 0;
break;
}
/* Parse size */
param = parse_option_parameters("", resize_options, NULL);
if (set_option_parameter(param, BLOCK_OPT_SIZE, size)) {
/* Error message already printed when size parsing fails */
exit(1);
}
n = get_option_parameter(param, BLOCK_OPT_SIZE)->value.n;
free_option_parameters(param);
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR);
if (relative) {
total_size = bdrv_getlength(bs) + n * relative;
} else {
total_size = n;
}
if (total_size <= 0) {
error("New image size must be positive");
}
ret = bdrv_truncate(bs, total_size);
switch (ret) {
case 0:
printf("Image resized.\n");
break;
case -ENOTSUP:
error("This image format does not support resize");
break;
case -EACCES:
error("Image is read-only");
break;
default:
error("Error resizing image (%d)", -ret);
break;
}
bdrv_delete(bs);
return 0;
}
static const img_cmd_t img_cmds[] = {
#define DEF(option, callback, arg_string) \
{ option, callback },

12
qemu-img.texi
View File

@ -106,6 +106,18 @@ they are displayed too.
@item snapshot [-l | -a @var{snapshot} | -c @var{snapshot} | -d @var{snapshot} ] @var{filename}
List, apply, create or delete snapshots in image @var{filename}.
@item resize @var{filename} [+ | -]@var{size}
Change the disk image as if it had been created with @var{size}.
Before using this command to shrink a disk image, you MUST use file system and
partitioning tools inside the VM to reduce allocated file systems and partition
sizes accordingly. Failure to do so will result in data loss!
After using this command to grow a disk image, you must use file system and
partitioning tools inside the VM to actually begin using the new space on the
device.
@end table
Supported image file formats: