* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
+
#include "qemu/osdep.h"
#include "qapi/error.h"
-#include "qemu-common.h"
#include "block/block_int.h"
+#include "block/qdict.h"
#include "sysemu/block-backend.h"
#include "qemu/module.h"
+#include "qemu/option.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/qobject-input-visitor.h"
+#include "qapi/qapi-visit-block-core.h"
#include "qemu/bswap.h"
#include "qemu/bitmap.h"
#include "migration/blocker.h"
+#include "parallels.h"
/**************************************************************/
#define HEADER_INUSE_MAGIC (0x746F6E59)
#define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32)
-#define DEFAULT_CLUSTER_SIZE 1048576 /* 1 MiB */
-
-
-// always little-endian
-typedef struct ParallelsHeader {
- char magic[16]; // "WithoutFreeSpace"
- uint32_t version;
- uint32_t heads;
- uint32_t cylinders;
- uint32_t tracks;
- uint32_t bat_entries;
- uint64_t nb_sectors;
- uint32_t inuse;
- uint32_t data_off;
- char padding[12];
-} QEMU_PACKED ParallelsHeader;
-
-
-typedef enum ParallelsPreallocMode {
- PRL_PREALLOC_MODE_FALLOCATE = 0,
- PRL_PREALLOC_MODE_TRUNCATE = 1,
- PRL_PREALLOC_MODE__MAX = 2,
-} ParallelsPreallocMode;
-
static QEnumLookup prealloc_mode_lookup = {
.array = (const char *const[]) {
"falloc",
.size = PRL_PREALLOC_MODE__MAX
};
-typedef struct BDRVParallelsState {
- /** Locking is conservative, the lock protects
- * - image file extending (truncate, fallocate)
- * - any access to block allocation table
- */
- CoMutex lock;
-
- ParallelsHeader *header;
- uint32_t header_size;
- bool header_unclean;
-
- unsigned long *bat_dirty_bmap;
- unsigned int bat_dirty_block;
-
- uint32_t *bat_bitmap;
- unsigned int bat_size;
-
- int64_t data_end;
- uint64_t prealloc_size;
- ParallelsPreallocMode prealloc_mode;
-
- unsigned int tracks;
-
- unsigned int off_multiplier;
- Error *migration_blocker;
-} BDRVParallelsState;
-
-
#define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode"
#define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size"
},
};
+static QemuOptsList parallels_create_opts = {
+ .name = "parallels-create-opts",
+ .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head),
+ .desc = {
+ {
+ .name = BLOCK_OPT_SIZE,
+ .type = QEMU_OPT_SIZE,
+ .help = "Virtual disk size",
+ },
+ {
+ .name = BLOCK_OPT_CLUSTER_SIZE,
+ .type = QEMU_OPT_SIZE,
+ .help = "Parallels image cluster size",
+ .def_value_str = stringify(DEFAULT_CLUSTER_SIZE),
+ },
+ { /* end of list */ }
+ }
+};
+
static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx)
{
static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, int *pnum)
{
+ int ret;
BDRVParallelsState *s = bs->opaque;
int64_t pos, space, idx, to_allocate, i, len;
return len;
}
if (s->data_end + space > (len >> BDRV_SECTOR_BITS)) {
- int ret;
space += s->prealloc_size;
if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) {
ret = bdrv_pwrite_zeroes(bs->file,
}
}
+ /* Try to read from backing to fill empty clusters
+ * FIXME: 1. previous write_zeroes may be redundant
+ * 2. most of data we read from backing will be rewritten by
+ * parallels_co_writev. On aligned-to-cluster write we do not need
+ * this read at all.
+ * 3. it would be good to combine write of data from backing and new
+ * data into one write call */
+ if (bs->backing) {
+ int64_t nb_cow_sectors = to_allocate * s->tracks;
+ int64_t nb_cow_bytes = nb_cow_sectors << BDRV_SECTOR_BITS;
+ void *buf = qemu_blockalign(bs, nb_cow_bytes);
+
+ ret = bdrv_co_pread(bs->backing, idx * s->tracks * BDRV_SECTOR_SIZE,
+ nb_cow_bytes, buf, 0);
+ if (ret < 0) {
+ qemu_vfree(buf);
+ return ret;
+ }
+
+ ret = bdrv_co_pwritev(bs->file, s->data_end * BDRV_SECTOR_SIZE,
+ nb_cow_bytes, buf, 0);
+ qemu_vfree(buf);
+ if (ret < 0) {
+ return ret;
+ }
+ }
+
for (i = 0; i < to_allocate; i++) {
s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier);
s->data_end += s->tracks;
}
-static int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs,
- int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file)
+static int coroutine_fn parallels_co_block_status(BlockDriverState *bs,
+ bool want_zero,
+ int64_t offset,
+ int64_t bytes,
+ int64_t *pnum,
+ int64_t *map,
+ BlockDriverState **file)
{
BDRVParallelsState *s = bs->opaque;
- int64_t offset;
+ int count;
+ assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE));
qemu_co_mutex_lock(&s->lock);
- offset = block_status(s, sector_num, nb_sectors, pnum);
+ offset = block_status(s, offset >> BDRV_SECTOR_BITS,
+ bytes >> BDRV_SECTOR_BITS, &count);
qemu_co_mutex_unlock(&s->lock);
+ *pnum = count * BDRV_SECTOR_SIZE;
if (offset < 0) {
return 0;
}
+ *map = offset * BDRV_SECTOR_SIZE;
*file = bs->file->bs;
- return (offset << BDRV_SECTOR_BITS) |
- BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
+ return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
}
static coroutine_fn int parallels_co_writev(BlockDriverState *bs,
- int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
+ int64_t sector_num, int nb_sectors,
+ QEMUIOVector *qiov, int flags)
{
BDRVParallelsState *s = bs->opaque;
uint64_t bytes_done = 0;
QEMUIOVector hd_qiov;
int ret = 0;
+ assert(!flags);
qemu_iovec_init(&hd_qiov, qiov->niov);
while (nb_sectors > 0) {
qemu_iovec_reset(&hd_qiov);
qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
- ret = bdrv_co_writev(bs->file, position, n, &hd_qiov);
+ ret = bdrv_co_pwritev(bs->file, position * BDRV_SECTOR_SIZE, nbytes,
+ &hd_qiov, 0);
if (ret < 0) {
break;
}
nbytes = n << BDRV_SECTOR_BITS;
+ qemu_iovec_reset(&hd_qiov);
+ qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
+
if (position < 0) {
- qemu_iovec_memset(qiov, bytes_done, 0, nbytes);
+ if (bs->backing) {
+ ret = bdrv_co_preadv(bs->backing, sector_num * BDRV_SECTOR_SIZE,
+ nbytes, &hd_qiov, 0);
+ if (ret < 0) {
+ break;
+ }
+ } else {
+ qemu_iovec_memset(&hd_qiov, 0, 0, nbytes);
+ }
} else {
- qemu_iovec_reset(&hd_qiov);
- qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
-
- ret = bdrv_co_readv(bs->file, position, n, &hd_qiov);
+ ret = bdrv_co_preadv(bs->file, position * BDRV_SECTOR_SIZE, nbytes,
+ &hd_qiov, 0);
if (ret < 0) {
break;
}
}
-static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res,
- BdrvCheckMode fix)
+static int coroutine_fn parallels_co_check(BlockDriverState *bs,
+ BdrvCheckResult *res,
+ BdrvCheckMode fix)
{
BDRVParallelsState *s = bs->opaque;
int64_t size, prev_off, high_off;
return size;
}
+ qemu_co_mutex_lock(&s->lock);
if (s->header_unclean) {
fprintf(stderr, "%s image was not closed correctly\n",
fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR");
prev_off = off;
}
+ ret = 0;
if (flush_bat) {
ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size);
if (ret < 0) {
res->check_errors++;
- return ret;
+ goto out;
}
}
if (ret < 0) {
error_report_err(local_err);
res->check_errors++;
- return ret;
+ goto out;
}
res->leaks_fixed += count;
}
}
- return 0;
+out:
+ qemu_co_mutex_unlock(&s->lock);
+ return ret;
}
-static int parallels_create(const char *filename, QemuOpts *opts, Error **errp)
+static int coroutine_fn parallels_co_create(BlockdevCreateOptions* opts,
+ Error **errp)
{
+ BlockdevCreateOptionsParallels *parallels_opts;
+ BlockDriverState *bs;
+ BlockBackend *blk;
int64_t total_size, cl_size;
- uint8_t tmp[BDRV_SECTOR_SIZE];
- Error *local_err = NULL;
- BlockBackend *file;
uint32_t bat_entries, bat_sectors;
ParallelsHeader header;
+ uint8_t tmp[BDRV_SECTOR_SIZE];
int ret;
- total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
- BDRV_SECTOR_SIZE);
- cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE,
- DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE);
+ assert(opts->driver == BLOCKDEV_DRIVER_PARALLELS);
+ parallels_opts = &opts->u.parallels;
+
+ /* Sanity checks */
+ total_size = parallels_opts->size;
+
+ if (parallels_opts->has_cluster_size) {
+ cl_size = parallels_opts->cluster_size;
+ } else {
+ cl_size = DEFAULT_CLUSTER_SIZE;
+ }
+
+ /* XXX What is the real limit here? This is an insanely large maximum. */
+ if (cl_size >= INT64_MAX / MAX_PARALLELS_IMAGE_FACTOR) {
+ error_setg(errp, "Cluster size is too large");
+ return -EINVAL;
+ }
if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) {
- error_propagate(errp, local_err);
+ error_setg(errp, "Image size is too large for this cluster size");
return -E2BIG;
}
- ret = bdrv_create_file(filename, opts, &local_err);
- if (ret < 0) {
- error_propagate(errp, local_err);
- return ret;
+ if (!QEMU_IS_ALIGNED(total_size, BDRV_SECTOR_SIZE)) {
+ error_setg(errp, "Image size must be a multiple of 512 bytes");
+ return -EINVAL;
}
- file = blk_new_open(filename, NULL, NULL,
- BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL,
- &local_err);
- if (file == NULL) {
- error_propagate(errp, local_err);
+ if (!QEMU_IS_ALIGNED(cl_size, BDRV_SECTOR_SIZE)) {
+ error_setg(errp, "Cluster size must be a multiple of 512 bytes");
+ return -EINVAL;
+ }
+
+ /* Create BlockBackend to write to the image */
+ bs = bdrv_open_blockdev_ref(parallels_opts->file, errp);
+ if (bs == NULL) {
return -EIO;
}
- blk_set_allow_write_beyond_eof(file, true);
+ blk = blk_new(bdrv_get_aio_context(bs),
+ BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL);
+ ret = blk_insert_bs(blk, bs, errp);
+ if (ret < 0) {
+ goto out;
+ }
+ blk_set_allow_write_beyond_eof(blk, true);
- ret = blk_truncate(file, 0, PREALLOC_MODE_OFF, errp);
+ /* Create image format */
+ ret = blk_truncate(blk, 0, PREALLOC_MODE_OFF, errp);
if (ret < 0) {
- goto exit;
+ goto out;
}
bat_entries = DIV_ROUND_UP(total_size, cl_size);
memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic));
header.version = cpu_to_le32(HEADER_VERSION);
/* don't care much about geometry, it is not used on image level */
- header.heads = cpu_to_le32(16);
- header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE / 16 / 32);
+ header.heads = cpu_to_le32(HEADS_NUMBER);
+ header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE
+ / HEADS_NUMBER / SEC_IN_CYL);
header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS);
header.bat_entries = cpu_to_le32(bat_entries);
header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE));
memset(tmp, 0, sizeof(tmp));
memcpy(tmp, &header, sizeof(header));
- ret = blk_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE, 0);
+ ret = blk_pwrite(blk, 0, tmp, BDRV_SECTOR_SIZE, 0);
if (ret < 0) {
goto exit;
}
- ret = blk_pwrite_zeroes(file, BDRV_SECTOR_SIZE,
+ ret = blk_pwrite_zeroes(blk, BDRV_SECTOR_SIZE,
(bat_sectors - 1) << BDRV_SECTOR_BITS, 0);
if (ret < 0) {
goto exit;
}
- ret = 0;
-done:
- blk_unref(file);
+ ret = 0;
+out:
+ blk_unref(blk);
+ bdrv_unref(bs);
return ret;
exit:
error_setg_errno(errp, -ret, "Failed to create Parallels image");
- goto done;
+ goto out;
+}
+
+static int coroutine_fn parallels_co_create_opts(const char *filename,
+ QemuOpts *opts,
+ Error **errp)
+{
+ BlockdevCreateOptions *create_options = NULL;
+ Error *local_err = NULL;
+ BlockDriverState *bs = NULL;
+ QDict *qdict;
+ Visitor *v;
+ int ret;
+
+ static const QDictRenames opt_renames[] = {
+ { BLOCK_OPT_CLUSTER_SIZE, "cluster-size" },
+ { NULL, NULL },
+ };
+
+ /* Parse options and convert legacy syntax */
+ qdict = qemu_opts_to_qdict_filtered(opts, NULL, ¶llels_create_opts,
+ true);
+
+ if (!qdict_rename_keys(qdict, opt_renames, errp)) {
+ ret = -EINVAL;
+ goto done;
+ }
+
+ /* Create and open the file (protocol layer) */
+ ret = bdrv_create_file(filename, opts, &local_err);
+ if (ret < 0) {
+ error_propagate(errp, local_err);
+ goto done;
+ }
+
+ bs = bdrv_open(filename, NULL, NULL,
+ BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp);
+ if (bs == NULL) {
+ ret = -EIO;
+ goto done;
+ }
+
+ /* Now get the QAPI type BlockdevCreateOptions */
+ qdict_put_str(qdict, "driver", "parallels");
+ qdict_put_str(qdict, "file", bs->node_name);
+
+ v = qobject_input_visitor_new_flat_confused(qdict, errp);
+ if (!v) {
+ ret = -EINVAL;
+ goto done;
+ }
+
+ visit_type_BlockdevCreateOptions(v, NULL, &create_options, &local_err);
+ visit_free(v);
+
+ if (local_err) {
+ error_propagate(errp, local_err);
+ ret = -EINVAL;
+ goto done;
+ }
+
+ /* Silently round up sizes */
+ create_options->u.parallels.size =
+ ROUND_UP(create_options->u.parallels.size, BDRV_SECTOR_SIZE);
+ create_options->u.parallels.cluster_size =
+ ROUND_UP(create_options->u.parallels.cluster_size, BDRV_SECTOR_SIZE);
+
+ /* Create the Parallels image (format layer) */
+ ret = parallels_co_create(create_options, errp);
+ if (ret < 0) {
+ goto done;
+ }
+ ret = 0;
+
+done:
+ qobject_unref(qdict);
+ bdrv_unref(bs);
+ qapi_free_BlockdevCreateOptions(create_options);
+ return ret;
}
error_free(s->migration_blocker);
}
-static QemuOptsList parallels_create_opts = {
- .name = "parallels-create-opts",
- .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head),
- .desc = {
- {
- .name = BLOCK_OPT_SIZE,
- .type = QEMU_OPT_SIZE,
- .help = "Virtual disk size",
- },
- {
- .name = BLOCK_OPT_CLUSTER_SIZE,
- .type = QEMU_OPT_SIZE,
- .help = "Parallels image cluster size",
- .def_value_str = stringify(DEFAULT_CLUSTER_SIZE),
- },
- { /* end of list */ }
- }
-};
-
static BlockDriver bdrv_parallels = {
.format_name = "parallels",
.instance_size = sizeof(BDRVParallelsState),
.bdrv_open = parallels_open,
.bdrv_close = parallels_close,
.bdrv_child_perm = bdrv_format_default_perms,
- .bdrv_co_get_block_status = parallels_co_get_block_status,
+ .bdrv_co_block_status = parallels_co_block_status,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_co_flush_to_os = parallels_co_flush_to_os,
.bdrv_co_readv = parallels_co_readv,
.bdrv_co_writev = parallels_co_writev,
-
- .bdrv_create = parallels_create,
- .bdrv_check = parallels_check,
+ .supports_backing = true,
+ .bdrv_co_create = parallels_co_create,
+ .bdrv_co_create_opts = parallels_co_create_opts,
+ .bdrv_co_check = parallels_co_check,
.create_opts = ¶llels_create_opts,
};
projects / mirror_qemu.git / blobdiff