bdrv: Use "Error" for creating images

Add an Error ** parameter to BlockDriver.bdrv_create to allow more
specific error messages.

Signed-off-by: Max Reitz <mreitz@redhat.com>

block.c

@@ -401,7 +401,7 @@ static void coroutine_fn bdrv_create_co_entry(void *opaque)
     CreateCo *cco = opaque;
     assert(cco->drv);
 
-    cco->ret = cco->drv->bdrv_create(cco->filename, cco->options);
+    cco->ret = cco->drv->bdrv_create(cco->filename, cco->options, NULL);
 }
 
 int bdrv_create(BlockDriver *drv, const char* filename,

block/cow.c

@@ -295,7 +295,8 @@ static void cow_close(BlockDriverState *bs)
 {
 }
 
-static int cow_create(const char *filename, QEMUOptionParameter *options)
+static int cow_create(const char *filename, QEMUOptionParameter *options,
+                      Error **errp)
 {
     struct cow_header_v2 cow_header;
     struct stat st;

block/gluster.c

@@ -357,7 +357,7 @@ out:
 }
 
 static int qemu_gluster_create(const char *filename,
-        QEMUOptionParameter *options)
+        QEMUOptionParameter *options, Error **errp)
 {
     struct glfs *glfs;
     struct glfs_fd *fd;

block/iscsi.c

@@ -1238,7 +1238,8 @@ static int iscsi_has_zero_init(BlockDriverState *bs)
     return 0;
 }
 
-static int iscsi_create(const char *filename, QEMUOptionParameter *options)
+static int iscsi_create(const char *filename, QEMUOptionParameter *options,
+                        Error **errp)
 {
     int ret = 0;
     int64_t total_size = 0;

block/qcow.c

@@ -659,7 +659,8 @@ static void qcow_close(BlockDriverState *bs)
     error_free(s->migration_blocker);
 }
 
-static int qcow_create(const char *filename, QEMUOptionParameter *options)
+static int qcow_create(const char *filename, QEMUOptionParameter *options,
+                       Error **errp)
 {
     int header_size, backing_filename_len, l1_size, shift, i;
     QCowHeader header;

block/qcow2.c

@@ -1468,7 +1468,8 @@ out:
     return ret;
 }
 
-static int qcow2_create(const char *filename, QEMUOptionParameter *options)
+static int qcow2_create(const char *filename, QEMUOptionParameter *options,
+                        Error **errp)
 {
     const char *backing_file = NULL;
     const char *backing_fmt = NULL;

block/qed.c

@@ -604,7 +604,8 @@ out:
     return ret;
 }
 
-static int bdrv_qed_create(const char *filename, QEMUOptionParameter *options)
+static int bdrv_qed_create(const char *filename, QEMUOptionParameter *options,
+                           Error **errp)
 {
     uint64_t image_size = 0;
     uint32_t cluster_size = QED_DEFAULT_CLUSTER_SIZE;

block/raw-posix.c

@@ -1041,7 +1041,8 @@ static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
     return (int64_t)st.st_blocks * 512;
 }
 
-static int raw_create(const char *filename, QEMUOptionParameter *options)
+static int raw_create(const char *filename, QEMUOptionParameter *options,
+                      Error **errp)
 {
     int fd;
     int result = 0;
@@ -1506,7 +1507,8 @@ static coroutine_fn BlockDriverAIOCB *hdev_aio_discard(BlockDriverState *bs,
                        cb, opaque, QEMU_AIO_DISCARD|QEMU_AIO_BLKDEV);
 }
 
-static int hdev_create(const char *filename, QEMUOptionParameter *options)
+static int hdev_create(const char *filename, QEMUOptionParameter *options,
+                       Error **errp)
 {
     int fd;
     int ret = 0;

block/raw-win32.c

@@ -422,7 +422,8 @@ static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
     return st.st_size;
 }
 
-static int raw_create(const char *filename, QEMUOptionParameter *options)
+static int raw_create(const char *filename, QEMUOptionParameter *options,
+                      Error **errp)
 {
     int fd;
     int64_t total_size = 0;

block/raw_bsd.c

@@ -130,7 +130,8 @@ static int raw_has_zero_init(BlockDriverState *bs)
     return bdrv_has_zero_init(bs->file);
 }
 
-static int raw_create(const char *filename, QEMUOptionParameter *options)
+static int raw_create(const char *filename, QEMUOptionParameter *options,
+                      Error **errp)
 {
     return bdrv_create_file(filename, options);
 }

block/rbd.c

@@ -287,7 +287,8 @@ static int qemu_rbd_set_conf(rados_t cluster, const char *conf)
     return ret;
 }
 
-static int qemu_rbd_create(const char *filename, QEMUOptionParameter *options)
+static int qemu_rbd_create(const char *filename, QEMUOptionParameter *options,
+                           Error **errp)
 {
     int64_t bytes = 0;
     int64_t objsize;

block/sheepdog.c

@@ -1438,7 +1438,8 @@ out:
     return ret;
 }
 
-static int sd_create(const char *filename, QEMUOptionParameter *options)
+static int sd_create(const char *filename, QEMUOptionParameter *options,
+                     Error **errp)
 {
     int ret = 0;
     uint32_t vid = 0, base_vid = 0;

block/ssh.c

@@ -651,7 +651,8 @@ static QEMUOptionParameter ssh_create_options[] = {
     { NULL }
 };
 
-static int ssh_create(const char *filename, QEMUOptionParameter *options)
+static int ssh_create(const char *filename, QEMUOptionParameter *options,
+                      Error **errp)
 {
     int r, ret;
     Error *local_err = NULL;

block/vdi.c

@@ -645,7 +645,8 @@ static int vdi_co_write(BlockDriverState *bs,
     return ret;
 }
 
-static int vdi_create(const char *filename, QEMUOptionParameter *options)
+static int vdi_create(const char *filename, QEMUOptionParameter *options,
+                      Error **errp)
 {
     int fd;
     int result = 0;

block/vmdk.c

@@ -1552,7 +1552,8 @@ static int filename_decompose(const char *filename, char *path, char *prefix,
     return VMDK_OK;
 }
 
-static int vmdk_create(const char *filename, QEMUOptionParameter *options)
+static int vmdk_create(const char *filename, QEMUOptionParameter *options,
+                       Error **errp)
 {
     int fd, idx = 0;
     char desc[BUF_SIZE];

block/vpc.c

@@ -684,7 +684,8 @@ static int create_fixed_disk(int fd, uint8_t *buf, int64_t total_size)
     return ret;
 }
 
-static int vpc_create(const char *filename, QEMUOptionParameter *options)
+static int vpc_create(const char *filename, QEMUOptionParameter *options,
+                      Error **errp)
 {
     uint8_t buf[1024];
     struct vhd_footer *footer = (struct vhd_footer *) buf;

include/block/block_int.h

@@ -90,7 +90,8 @@ struct BlockDriver {
                       const uint8_t *buf, int nb_sectors);
     void (*bdrv_close)(BlockDriverState *bs);
     void (*bdrv_rebind)(BlockDriverState *bs);
-    int (*bdrv_create)(const char *filename, QEMUOptionParameter *options);
+    int (*bdrv_create)(const char *filename, QEMUOptionParameter *options,
+                       Error **errp);
     int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
     int (*bdrv_make_empty)(BlockDriverState *bs);
     /* aio */