block: Add errp to b{lk,drv}_truncate()

[mirror_qemu.git] / block / commit.c

diff --git a/block/commit.c b/block/commit.c
index 22a0a4db98869219d2c9ae388e02db79106a02d6..76a0d98c6f5c0678e0135e9bd83ffc7eb0063aca 100644 (file)
--- a/block/commit.c
+++ b/block/commit.c
@@ -13,6 +13,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/cutils.h"
 #include "trace.h"
 #include "block/block_int.h"
 #include "block/blockjob_int.h"
@@ -150,7 +151,7 @@ static void coroutine_fn commit_run(void *opaque)
     }
 
     if (base_len < s->common.len) {
-        ret = blk_truncate(s->base, s->common.len);
+        ret = blk_truncate(s->base, s->common.len, NULL);
         if (ret) {
             goto out;
         }
@@ -232,6 +233,23 @@ static int coroutine_fn bdrv_commit_top_preadv(BlockDriverState *bs,
     return bdrv_co_preadv(bs->backing, offset, bytes, qiov, flags);
 }
 
+static int64_t coroutine_fn bdrv_commit_top_get_block_status(
+    BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum,
+    BlockDriverState **file)
+{
+    *pnum = nb_sectors;
+    *file = bs->backing->bs;
+    return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA |
+           (sector_num << BDRV_SECTOR_BITS);
+}
+
+static void bdrv_commit_top_refresh_filename(BlockDriverState *bs, QDict *opts)
+{
+    bdrv_refresh_filename(bs->backing->bs);
+    pstrcpy(bs->exact_filename, sizeof(bs->exact_filename),
+            bs->backing->bs->filename);
+}
+
 static void bdrv_commit_top_close(BlockDriverState *bs)
 {
 }
@@ -248,10 +266,12 @@ static void bdrv_commit_top_child_perm(BlockDriverState *bs, BdrvChild *c,
 /* Dummy node that provides consistent read to its users without requiring it
  * from its backing file and that allows writes on the backing file chain. */
 static BlockDriver bdrv_commit_top = {
-    .format_name        = "commit_top",
-    .bdrv_co_preadv     = bdrv_commit_top_preadv,
-    .bdrv_close         = bdrv_commit_top_close,
-    .bdrv_child_perm    = bdrv_commit_top_child_perm,
+    .format_name                = "commit_top",
+    .bdrv_co_preadv             = bdrv_commit_top_preadv,
+    .bdrv_co_get_block_status   = bdrv_commit_top_get_block_status,
+    .bdrv_refresh_filename      = bdrv_commit_top_refresh_filename,
+    .bdrv_close                 = bdrv_commit_top_close,
+    .bdrv_child_perm            = bdrv_commit_top_child_perm,
 };
 
 void commit_start(const char *job_id, BlockDriverState *bs,
@@ -315,9 +335,23 @@ void commit_start(const char *job_id, BlockDriverState *bs,
     if (commit_top_bs == NULL) {
         goto fail;
     }
+    commit_top_bs->total_sectors = top->total_sectors;
+    bdrv_set_aio_context(commit_top_bs, bdrv_get_aio_context(top));
 
-    bdrv_set_backing_hd(commit_top_bs, top, &error_abort);
-    bdrv_set_backing_hd(overlay_bs, commit_top_bs, &error_abort);
+    bdrv_set_backing_hd(commit_top_bs, top, &local_err);
+    if (local_err) {
+        bdrv_unref(commit_top_bs);
+        commit_top_bs = NULL;
+        error_propagate(errp, local_err);
+        goto fail;
+    }
+    bdrv_set_backing_hd(overlay_bs, commit_top_bs, &local_err);
+    if (local_err) {
+        bdrv_unref(commit_top_bs);
+        commit_top_bs = NULL;
+        error_propagate(errp, local_err);
+        goto fail;
+    }
 
     s->commit_top_bs = commit_top_bs;
     bdrv_unref(commit_top_bs);
@@ -364,7 +398,7 @@ void commit_start(const char *job_id, BlockDriverState *bs,
 
     /* Required permissions are already taken with block_job_add_bdrv() */
     s->top = blk_new(0, BLK_PERM_ALL);
-    blk_insert_bs(s->top, top, errp);
+    ret = blk_insert_bs(s->top, top, errp);
     if (ret < 0) {
         goto fail;
     }
@@ -450,6 +484,7 @@ int bdrv_commit(BlockDriverState *bs)
         error_report_err(local_err);
         goto ro_cleanup;
     }
+    bdrv_set_aio_context(commit_top_bs, bdrv_get_aio_context(backing_file_bs));
 
     bdrv_set_backing_hd(commit_top_bs, backing_file_bs, &error_abort);
     bdrv_set_backing_hd(bs, commit_top_bs, &error_abort);
@@ -476,8 +511,9 @@ int bdrv_commit(BlockDriverState *bs)
      * grow the backing file image if possible.  If not possible,
      * we must return an error */
     if (length > backing_length) {
-        ret = blk_truncate(backing, length);
+        ret = blk_truncate(backing, length, &local_err);
         if (ret < 0) {
+            error_report_err(local_err);
             goto ro_cleanup;
         }
     }