[Qemu-devel] [PATCH 3/5] block: added check image option and callback bdrv_is_opened_unclean

["Denis V. Lunev" <den@openvz.org>]

From: Olga Krishtal <okrishtal@virtuozzo.com>

If image is opened for writing and it was not closed correctly
(the image is dirty) we have to check and repair it. By default
the option is off.

bdrv_is_opened_unclean - cheks if the image is dirty
This callbsck will be used to ensure that image was
closed correctly, and if not - to check and repair it.

Signed-off-by: Olga Krishtal <okrishtal@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Max Reitz <mreitz@redhat.com>
CC: Eric Blake <eblake@redhat.com>
CC: Fam Zheng <famz@redhat.com>
---
 block.c                   | 32 ++++++++++++++++++++++++++++++++
 include/block/block.h     |  1 +
 include/block/block_int.h |  1 +
 3 files changed, 34 insertions(+)

diff --git a/block.c b/block.c
index 74228b8..1f704f5 100644
--- a/block.c
+++ b/block.c
@@ -903,6 +903,12 @@ static QemuOptsList bdrv_runtime_opts = {
             .help = "How to lock the image: none or lockfile",
             .def_value_str = "none",
         },
+        {
+            .name = "check",
+            .type = QEMU_OPT_BOOL,
+            .help = "Check and repair the image if it is unclean",
+            .def_value_str = "off",
+        },
         { /* end of list */ }
     },
 };
@@ -1042,6 +1048,16 @@ static int bdrv_open_common(BlockDriverState *bs, BdrvChild *file,
         }
     }
 
+    if (!bs->read_only && qemu_opt_get_bool_del(opts, "check", true) &&
+                bdrv_is_opened_unclean(bs) && !(flags | BDRV_O_CHECK)) {
+        BdrvCheckResult result = {0};
+        ret = bdrv_check(bs, &result, BDRV_FIX_ERRORS);
+        if (ret < 0) {
+            error_setg_errno(errp, -ret, "Could not repair dirty image");
+            bdrv_close(bs);
+            goto fail_opts;
+        }
+    }
     if (bs->encrypted) {
         error_report("Encrypted images are deprecated");
         error_printf("Support for them will be removed in a future release.\n"
@@ -4361,3 +4377,19 @@ int bdrv_lock_image(BlockDriverState *bs, BdrvLockImage lock)
     }
     return -EOPNOTSUPP;
 }
+
+bool bdrv_is_opened_unclean(BlockDriverState *bs)
+{
+    BlockDriver *drv = bs->drv;
+    if (drv != NULL && drv->bdrv_is_opened_unclean != NULL) {
+        return drv->bdrv_is_opened_unclean(bs);
+    }
+    if (bs->file == NULL) {
+        return false;
+    }
+    drv = bs->file->bs->drv;
+    if (drv != NULL && drv->bdrv_is_opened_unclean != NULL) {
+        return drv->bdrv_is_opened_unclean;
+    }
+    return false;
+}
diff --git a/include/block/block.h b/include/block/block.h
index 27fc434..c366990 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -507,6 +507,7 @@ void bdrv_dirty_iter_init(BdrvDirtyBitmap *bitmap, struct HBitmapIter *hbi);
 void bdrv_set_dirty_iter(struct HBitmapIter *hbi, int64_t offset);
 int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap);
 int bdrv_lock_image(BlockDriverState *bs, BdrvLockImage lock);
+bool bdrv_is_opened_unclean(BlockDriverState *bs);
 
 void bdrv_enable_copy_on_read(BlockDriverState *bs);
 void bdrv_disable_copy_on_read(BlockDriverState *bs);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 755f342..fc3f4a6 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -137,6 +137,7 @@ struct BlockDriver {
     int (*bdrv_make_empty)(BlockDriverState *bs);
     int (*bdrv_lock_image)(BlockDriverState *bs, BdrvLockImage lock);
 
+    bool (*bdrv_is_opened_unclean)(BlockDriverState *bs);
     void (*bdrv_refresh_filename)(BlockDriverState *bs, QDict *options);
 
     /* aio */
-- 
2.1.4