Merge remote-tracking branch 'kwolf/for-anthony' into staging

# By Max Reitz (11) and others
# Via Kevin Wolf
* kwolf/for-anthony: (26 commits)
  qemu-iotests: Overlapping cluster allocations
  qcow2_check: Mark image consistent
  qcow2-refcount: Repair shared refcount blocks
  qcow2-refcount: Repair OFLAG_COPIED errors
  qcow2-refcount: Move OFLAG_COPIED checks
  qcow2: Employ metadata overlap checks
  qcow2: Metadata overlap checks
  qcow2: Add corrupt bit
  qemu-iotests: Snapshotting zero clusters
  qcow2-refcount: Snapshot update for zero clusters
  option: Add assigned flag to QEMUOptionParameter
  gluster: Abort on AIO completion failure
  block: Remove old raw driver
  switch raw block driver from "raw.o" to "raw_bsd.o"
  raw_bsd: register bdrv_raw
  raw_bsd: add raw_create_options
  raw_bsd: introduce "special members"
  raw_bsd: add raw_create()
  raw_bsd: emit debug events in bdrv_co_readv() and bdrv_co_writev()
  add skeleton for BSD licensed "raw" BlockDriver
  ...

Message-id: 1378111792-20436-1-git-send-email-kwolf@redhat.com
Signed-off-by: Anthony Liguori <anthony@codemonkey.ws>

block.c

@@ -743,7 +743,6 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
             ret = -EINVAL;
             goto free_and_fail;
         }
-        assert(file != NULL);
         bs->file = file;
         ret = drv->bdrv_open(bs, options, open_flags);
     }

block/Makefile.objs

@@ -1,4 +1,4 @@
-block-obj-y += raw.o cow.o qcow.o vdi.o vmdk.o cloop.o dmg.o bochs.o vpc.o vvfat.o
+block-obj-y += raw_bsd.o cow.o qcow.o vdi.o vmdk.o cloop.o dmg.o bochs.o vpc.o vvfat.o
 block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o qcow2-cache.o
 block-obj-y += qed.o qed-gencb.o qed-l2-cache.o qed-table.o qed-cluster.o
 block-obj-y += qed-check.o

block/blkdebug.c

@@ -168,6 +168,7 @@ static const char *event_names[BLKDBG_EVENT_MAX] = {
 
     [BLKDBG_REFTABLE_LOAD]                  = "reftable_load",
     [BLKDBG_REFTABLE_GROW]                  = "reftable_grow",
+    [BLKDBG_REFTABLE_UPDATE]                = "reftable_update",
 
     [BLKDBG_REFBLOCK_LOAD]                  = "refblock_load",
     [BLKDBG_REFBLOCK_UPDATE]                = "refblock_update",

block/gluster.c

@@ -427,20 +427,9 @@ static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret, void *arg)
         /*
          * Gluster AIO callback thread failed to notify the waiting
          * QEMU thread about IO completion.
-         *
-         * Complete this IO request and make the disk inaccessible for
-         * subsequent reads and writes.
          */
-        error_report("Gluster failed to notify QEMU about IO completion");
-
-        qemu_mutex_lock_iothread(); /* We are in gluster thread context */
-        acb->common.cb(acb->common.opaque, -EIO);
-        qemu_aio_release(acb);
-        close(s->fds[GLUSTER_FD_READ]);
-        close(s->fds[GLUSTER_FD_WRITE]);
-        qemu_aio_set_fd_handler(s->fds[GLUSTER_FD_READ], NULL, NULL, NULL);
-        bs->drv = NULL; /* Make the disk inaccessible */
-        qemu_mutex_unlock_iothread();
+        error_report("Gluster AIO completion failed: %s", strerror(errno));
+        abort();
     }
 }
 

block/qcow2-cache.c

@@ -114,6 +114,23 @@ static int qcow2_cache_entry_flush(BlockDriverState *bs, Qcow2Cache *c, int i)
         return ret;
     }
 
+    if (c == s->refcount_block_cache) {
+        ret = qcow2_pre_write_overlap_check(bs,
+                QCOW2_OL_DEFAULT & ~QCOW2_OL_REFCOUNT_BLOCK,
+                c->entries[i].offset, s->cluster_size);
+    } else if (c == s->l2_table_cache) {
+        ret = qcow2_pre_write_overlap_check(bs,
+                QCOW2_OL_DEFAULT & ~QCOW2_OL_ACTIVE_L2,
+                c->entries[i].offset, s->cluster_size);
+    } else {
+        ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT,
+                c->entries[i].offset, s->cluster_size);
+    }
+
+    if (ret < 0) {
+        return ret;
+    }
+
     if (c == s->refcount_block_cache) {
         BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_UPDATE_PART);
     } else if (c == s->l2_table_cache) {

block/qcow2-cluster.c

@@ -80,6 +80,14 @@ int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,
         goto fail;
     }
 
+    /* the L1 position has not yet been updated, so these clusters must
+     * indeed be completely free */
+    ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT,
+                                        new_l1_table_offset, new_l1_size2);
+    if (ret < 0) {
+        goto fail;
+    }
+
     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]);
@@ -137,7 +145,7 @@ static int 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(BlockDriverState *bs, int l1_index)
+int qcow2_write_l1_entry(BlockDriverState *bs, int l1_index)
 {
     BDRVQcowState *s = bs->opaque;
     uint64_t buf[L1_ENTRIES_PER_SECTOR];
@@ -149,6 +157,13 @@ static int write_l1_entry(BlockDriverState *bs, int l1_index)
         buf[i] = cpu_to_be64(s->l1_table[l1_start_index + i]);
     }
 
+    ret = qcow2_pre_write_overlap_check(bs,
+            QCOW2_OL_DEFAULT & ~QCOW2_OL_ACTIVE_L1,
+            s->l1_table_offset + 8 * l1_start_index, sizeof(buf));
+    if (ret < 0) {
+        return ret;
+    }
+
     BLKDBG_EVENT(bs->file, BLKDBG_L1_UPDATE);
     ret = bdrv_pwrite_sync(bs->file, s->l1_table_offset + 8 * l1_start_index,
         buf, sizeof(buf));
@@ -239,7 +254,7 @@ static int l2_allocate(BlockDriverState *bs, int l1_index, uint64_t **table)
     /* update the L1 entry */
     trace_qcow2_l2_allocate_write_l1(bs, l1_index);
     s->l1_table[l1_index] = l2_offset | QCOW_OFLAG_COPIED;
-    ret = write_l1_entry(bs, l1_index);
+    ret = qcow2_write_l1_entry(bs, l1_index);
     if (ret < 0) {
         goto fail;
     }
@@ -368,6 +383,12 @@ static int coroutine_fn copy_sectors(BlockDriverState *bs,
                         &s->aes_encrypt_key);
     }
 
+    ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT,
+            cluster_offset + n_start * BDRV_SECTOR_SIZE, n * BDRV_SECTOR_SIZE);
+    if (ret < 0) {
+        goto out;
+    }
+
     BLKDBG_EVENT(bs->file, BLKDBG_COW_WRITE);
     ret = bdrv_co_writev(bs->file, (cluster_offset >> 9) + n_start, n, &qiov);
     if (ret < 0) {