block: introduce bdrv_get_block_status API

For now, bdrv_get_block_status is just another name for bdrv_is_allocated.
The next patches will add more flags.

This also touches all block drivers with a mostly mechanical rename.  The
sole exception is cow; because it calls cow_co_is_allocated from the read
code, we keep that function and make cow_co_get_block_status a wrapper.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

block.c

@@ -3044,15 +3044,15 @@ int bdrv_has_zero_init(BlockDriverState *bs)
     return 0;
 }
 
-typedef struct BdrvCoIsAllocatedData {
+typedef struct BdrvCoGetBlockStatusData {
     BlockDriverState *bs;
     BlockDriverState *base;
     int64_t sector_num;
     int nb_sectors;
     int *pnum;
-    int ret;
+    int64_t ret;
     bool done;
-} BdrvCoIsAllocatedData;
+} BdrvCoGetBlockStatusData;
 
 /*
  * Returns true iff the specified sector is present in the disk image. Drivers
@@ -3069,9 +3069,9 @@ typedef struct BdrvCoIsAllocatedData {
  * 'nb_sectors' is the max value 'pnum' should be set to.  If nb_sectors goes
  * beyond the end of the disk image it will be clamped.
  */
-static int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs,
-                                             int64_t sector_num,
-                                             int nb_sectors, int *pnum)
+static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs,
+                                                     int64_t sector_num,
+                                                     int nb_sectors, int *pnum)
 {
     int64_t length;
     int64_t n;
@@ -3091,35 +3091,35 @@ static int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs,
         nb_sectors = n;
     }
 
-    if (!bs->drv->bdrv_co_is_allocated) {
+    if (!bs->drv->bdrv_co_get_block_status) {
         *pnum = nb_sectors;
         return 1;
     }
 
-    return bs->drv->bdrv_co_is_allocated(bs, sector_num, nb_sectors, pnum);
+    return bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum);
 }
 
-/* Coroutine wrapper for bdrv_is_allocated() */
-static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque)
+/* Coroutine wrapper for bdrv_get_block_status() */
+static void coroutine_fn bdrv_get_block_status_co_entry(void *opaque)
 {
-    BdrvCoIsAllocatedData *data = opaque;
+    BdrvCoGetBlockStatusData *data = opaque;
     BlockDriverState *bs = data->bs;
 
-    data->ret = bdrv_co_is_allocated(bs, data->sector_num, data->nb_sectors,
-                                     data->pnum);
+    data->ret = bdrv_co_get_block_status(bs, data->sector_num, data->nb_sectors,
+                                         data->pnum);
     data->done = true;
 }
 
 /*
- * Synchronous wrapper around bdrv_co_is_allocated().
+ * Synchronous wrapper around bdrv_co_get_block_status().
  *
- * See bdrv_co_is_allocated() for details.
+ * See bdrv_co_get_block_status() for details.
  */
-int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
-                      int *pnum)
+int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
+                              int nb_sectors, int *pnum)
 {
     Coroutine *co;
-    BdrvCoIsAllocatedData data = {
+    BdrvCoGetBlockStatusData data = {
         .bs = bs,
         .sector_num = sector_num,
         .nb_sectors = nb_sectors,
@@ -3129,9 +3129,9 @@ int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
 
     if (qemu_in_coroutine()) {
         /* Fast-path if already in coroutine context */
-        bdrv_is_allocated_co_entry(&data);
+        bdrv_get_block_status_co_entry(&data);
     } else {
-        co = qemu_coroutine_create(bdrv_is_allocated_co_entry);
+        co = qemu_coroutine_create(bdrv_get_block_status_co_entry);
         qemu_coroutine_enter(co, &data);
         while (!data.done) {
             qemu_aio_wait();
@@ -3140,6 +3140,12 @@ int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
     return data.ret;
 }
 
+int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num,
+                                   int nb_sectors, int *pnum)
+{
+    return bdrv_get_block_status(bs, sector_num, nb_sectors, pnum);
+}
+
 /*
  * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP]
  *

block/cow.c

@@ -188,6 +188,12 @@ static int coroutine_fn cow_co_is_allocated(BlockDriverState *bs,
     return changed;
 }
 
+static int64_t coroutine_fn cow_co_get_block_status(BlockDriverState *bs,
+        int64_t sector_num, int nb_sectors, int *num_same)
+{
+    return cow_co_is_allocated(bs, sector_num, nb_sectors, num_same);
+}
+
 static int cow_update_bitmap(BlockDriverState *bs, int64_t sector_num,
         int nb_sectors)
 {
@@ -371,7 +377,7 @@ static BlockDriver bdrv_cow = {
 
     .bdrv_read              = cow_co_read,
     .bdrv_write             = cow_co_write,
-    .bdrv_co_is_allocated   = cow_co_is_allocated,
+    .bdrv_co_get_block_status   = cow_co_get_block_status,
 
     .create_options = cow_create_options,
 };

block/qcow.c

@@ -395,7 +395,7 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
     return cluster_offset;
 }
 
-static int coroutine_fn qcow_co_is_allocated(BlockDriverState *bs,
+static int64_t coroutine_fn qcow_co_get_block_status(BlockDriverState *bs,
         int64_t sector_num, int nb_sectors, int *pnum)
 {
     BDRVQcowState *s = bs->opaque;
@@ -896,7 +896,7 @@ static BlockDriver bdrv_qcow = {
 
     .bdrv_co_readv          = qcow_co_readv,
     .bdrv_co_writev         = qcow_co_writev,
-    .bdrv_co_is_allocated   = qcow_co_is_allocated,
+    .bdrv_co_get_block_status   = qcow_co_get_block_status,
 
     .bdrv_set_key           = qcow_set_key,
     .bdrv_make_empty        = qcow_make_empty,

block/qcow2.c

@@ -688,7 +688,7 @@ static int qcow2_reopen_prepare(BDRVReopenState *state,
     return 0;
 }
 
-static int coroutine_fn qcow2_co_is_allocated(BlockDriverState *bs,
+static int64_t coroutine_fn qcow2_co_get_block_status(BlockDriverState *bs,
         int64_t sector_num, int nb_sectors, int *pnum)
 {
     BDRVQcowState *s = bs->opaque;
@@ -1866,7 +1866,7 @@ static BlockDriver bdrv_qcow2 = {
     .bdrv_reopen_prepare  = qcow2_reopen_prepare,
     .bdrv_create        = qcow2_create,
     .bdrv_has_zero_init = bdrv_has_zero_init_1,
-    .bdrv_co_is_allocated = qcow2_co_is_allocated,
+    .bdrv_co_get_block_status = qcow2_co_get_block_status,
     .bdrv_set_key       = qcow2_set_key,
     .bdrv_make_empty    = qcow2_make_empty,
 

block/qed.c

@@ -667,7 +667,7 @@ static void qed_is_allocated_cb(void *opaque, int ret, uint64_t offset, size_t l
     }
 }
 
-static int coroutine_fn bdrv_qed_co_is_allocated(BlockDriverState *bs,
+static int64_t coroutine_fn bdrv_qed_co_get_block_status(BlockDriverState *bs,
                                                  int64_t sector_num,
                                                  int nb_sectors, int *pnum)
 {
@@ -1575,7 +1575,7 @@ static BlockDriver bdrv_qed = {
     .bdrv_reopen_prepare      = bdrv_qed_reopen_prepare,
     .bdrv_create              = bdrv_qed_create,
     .bdrv_has_zero_init       = bdrv_has_zero_init_1,
-    .bdrv_co_is_allocated     = bdrv_qed_co_is_allocated,
+    .bdrv_co_get_block_status = bdrv_qed_co_get_block_status,
     .bdrv_make_empty          = bdrv_qed_make_empty,
     .bdrv_aio_readv           = bdrv_qed_aio_readv,
     .bdrv_aio_writev          = bdrv_qed_aio_writev,

block/raw-posix.c

@@ -1084,7 +1084,7 @@ static int raw_create(const char *filename, QEMUOptionParameter *options)
  * 'nb_sectors' is the max value 'pnum' should be set to.  If nb_sectors goes
  * beyond the end of the disk image it will be clamped.
  */
-static int coroutine_fn raw_co_is_allocated(BlockDriverState *bs,
+static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
                                             int64_t sector_num,
                                             int nb_sectors, int *pnum)
 {
@@ -1200,7 +1200,7 @@ static BlockDriver bdrv_file = {
     .bdrv_close = raw_close,
     .bdrv_create = raw_create,
     .bdrv_has_zero_init = bdrv_has_zero_init_1,
-    .bdrv_co_is_allocated = raw_co_is_allocated,
+    .bdrv_co_get_block_status = raw_co_get_block_status,
 
     .bdrv_aio_readv = raw_aio_readv,
     .bdrv_aio_writev = raw_aio_writev,

block/raw_bsd.c

@@ -58,11 +58,11 @@ static int coroutine_fn raw_co_writev(BlockDriverState *bs, int64_t sector_num,
     return bdrv_co_writev(bs->file, sector_num, nb_sectors, qiov);
 }
 
-static int coroutine_fn raw_co_is_allocated(BlockDriverState *bs,
-                                            int64_t sector_num, int nb_sectors,
-                                            int *pnum)
+static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
+                                            int64_t sector_num,
+                                            int nb_sectors, int *pnum)
 {
-    return bdrv_is_allocated(bs->file, sector_num, nb_sectors, pnum);
+    return bdrv_get_block_status(bs->file, sector_num, nb_sectors, pnum);
 }
 
 static int coroutine_fn raw_co_write_zeroes(BlockDriverState *bs,
@@ -164,7 +164,7 @@ static BlockDriver bdrv_raw = {
     .bdrv_co_writev       = &raw_co_writev,
     .bdrv_co_write_zeroes = &raw_co_write_zeroes,
     .bdrv_co_discard      = &raw_co_discard,
-    .bdrv_co_is_allocated = &raw_co_is_allocated,
+    .bdrv_co_get_block_status = &raw_co_get_block_status,
     .bdrv_truncate        = &raw_truncate,
     .bdrv_getlength       = &raw_getlength,
     .bdrv_get_info        = &raw_get_info,

block/sheepdog.c

@@ -2270,9 +2270,9 @@ static coroutine_fn int sd_co_discard(BlockDriverState *bs, int64_t sector_num,
     return acb->ret;
 }
 
-static coroutine_fn int
-sd_co_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
-                   int *pnum)
+static coroutine_fn int64_t
+sd_co_get_block_status(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
+                       int *pnum)
 {
     BDRVSheepdogState *s = bs->opaque;
     SheepdogInode *inode = &s->inode;
@@ -2338,7 +2338,7 @@ static BlockDriver bdrv_sheepdog = {
     .bdrv_co_writev = sd_co_writev,
     .bdrv_co_flush_to_disk  = sd_co_flush_to_disk,
     .bdrv_co_discard = sd_co_discard,
-    .bdrv_co_is_allocated = sd_co_is_allocated,
+    .bdrv_co_get_block_status = sd_co_get_block_status,
 
     .bdrv_snapshot_create   = sd_snapshot_create,
     .bdrv_snapshot_goto     = sd_snapshot_goto,
@@ -2366,7 +2366,7 @@ static BlockDriver bdrv_sheepdog_tcp = {
     .bdrv_co_writev = sd_co_writev,
     .bdrv_co_flush_to_disk  = sd_co_flush_to_disk,
     .bdrv_co_discard = sd_co_discard,
-    .bdrv_co_is_allocated = sd_co_is_allocated,
+    .bdrv_co_get_block_status = sd_co_get_block_status,
 
     .bdrv_snapshot_create   = sd_snapshot_create,
     .bdrv_snapshot_goto     = sd_snapshot_goto,
@@ -2394,7 +2394,7 @@ static BlockDriver bdrv_sheepdog_unix = {
     .bdrv_co_writev = sd_co_writev,
     .bdrv_co_flush_to_disk  = sd_co_flush_to_disk,
     .bdrv_co_discard = sd_co_discard,
-    .bdrv_co_is_allocated = sd_co_is_allocated,
+    .bdrv_co_get_block_status = sd_co_get_block_status,
 
     .bdrv_snapshot_create   = sd_snapshot_create,
     .bdrv_snapshot_goto     = sd_snapshot_goto,

block/vdi.c

@@ -470,7 +470,7 @@ static int vdi_reopen_prepare(BDRVReopenState *state,
     return 0;
 }
 
-static int coroutine_fn vdi_co_is_allocated(BlockDriverState *bs,
+static int64_t coroutine_fn vdi_co_get_block_status(BlockDriverState *bs,
         int64_t sector_num, int nb_sectors, int *pnum)
 {
     /* TODO: Check for too large sector_num (in bdrv_is_allocated or here). */
@@ -780,7 +780,7 @@ static BlockDriver bdrv_vdi = {
     .bdrv_reopen_prepare = vdi_reopen_prepare,
     .bdrv_create = vdi_create,
     .bdrv_has_zero_init = bdrv_has_zero_init_1,
-    .bdrv_co_is_allocated = vdi_co_is_allocated,
+    .bdrv_co_get_block_status = vdi_co_get_block_status,
     .bdrv_make_empty = vdi_make_empty,
 
     .bdrv_read = vdi_co_read,

block/vmdk.c

@@ -1042,7 +1042,7 @@ static VmdkExtent *find_extent(BDRVVmdkState *s,
     return NULL;
 }
 
-static int coroutine_fn vmdk_co_is_allocated(BlockDriverState *bs,
+static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs,
         int64_t sector_num, int nb_sectors, int *pnum)
 {
     BDRVVmdkState *s = bs->opaque;
@@ -1837,7 +1837,7 @@ static BlockDriver bdrv_vmdk = {
     .bdrv_close                   = vmdk_close,
     .bdrv_create                  = vmdk_create,
     .bdrv_co_flush_to_disk        = vmdk_co_flush,
-    .bdrv_co_is_allocated         = vmdk_co_is_allocated,
+    .bdrv_co_get_block_status     = vmdk_co_get_block_status,
     .bdrv_get_allocated_file_size = vmdk_get_allocated_file_size,
     .bdrv_has_zero_init           = vmdk_has_zero_init,
 

block/vvfat.c

@@ -2874,7 +2874,7 @@ static coroutine_fn int vvfat_co_write(BlockDriverState *bs, int64_t sector_num,
     return ret;
 }
 
-static int coroutine_fn vvfat_co_is_allocated(BlockDriverState *bs,
+static int64_t coroutine_fn vvfat_co_get_block_status(BlockDriverState *bs,
 	int64_t sector_num, int nb_sectors, int* n)
 {
     BDRVVVFATState* s = bs->opaque;
@@ -2984,7 +2984,7 @@ static BlockDriver bdrv_vvfat = {
 
     .bdrv_read              = vvfat_co_read,
     .bdrv_write             = vvfat_co_write,
-    .bdrv_co_is_allocated   = vvfat_co_is_allocated,
+    .bdrv_co_get_block_status = vvfat_co_get_block_status,
 };
 
 static void bdrv_vvfat_init(void)

include/block/block.h

@@ -269,6 +269,8 @@ int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 int bdrv_has_zero_init_1(BlockDriverState *bs);
 int bdrv_has_zero_init(BlockDriverState *bs);
+int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
+                              int nb_sectors, int *pnum);
 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
                       int *pnum);
 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,

include/block/block_int.h

@@ -118,7 +118,7 @@ struct BlockDriver {
         int64_t sector_num, int nb_sectors);
     int coroutine_fn (*bdrv_co_discard)(BlockDriverState *bs,
         int64_t sector_num, int nb_sectors);
-    int coroutine_fn (*bdrv_co_is_allocated)(BlockDriverState *bs,
+    int64_t coroutine_fn (*bdrv_co_get_block_status)(BlockDriverState *bs,
         int64_t sector_num, int nb_sectors, int *pnum);
 
     /*