Patchwork [1/2] block: add dirty flag status to qemu-img

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Submitter Robert Wang
Date Dec. 31, 2011, 9:06 a.m.
Message ID <1325322388-4825-1-git-send-email-wdongxu@linux.vnet.ibm.com>
Download mbox | patch
Permalink /patch/133734/
State New
Headers show

Comments

Robert Wang - Dec. 31, 2011, 9:06 a.m.
From: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>

Some block drivers can verify their image files are clean or not. So we can show
it while using "qemu-img info"

CC: Kevin Wolf <kwolf@redhat.com>
CC: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
---
Previous discussion can be found at:
http://patchwork.ozlabs.org/patch/128730/

 block.c     |   14 ++++++++++++++
 block.h     |    2 ++
 block_int.h |    1 +
 qemu-img.c  |    3 +++
 4 files changed, 20 insertions(+), 0 deletions(-)
Stefan Hajnoczi - Jan. 11, 2012, 2:35 p.m.
On Sat, Dec 31, 2011 at 9:06 AM, Dong Xu Wang
<wdongxu@linux.vnet.ibm.com> wrote:
> +int bdrv_is_dirty(BlockDriverState *bs)

bool would be nicer instead of int.  Traditionally we used int but C99
has been around for a long time now and it's more appropriate.

> diff --git a/qemu-img.c b/qemu-img.c
> index 01cc0d3..a79c274 100644
> --- a/qemu-img.c
> +++ b/qemu-img.c
> @@ -1153,6 +1153,9 @@ static int img_info(int argc, char **argv)
>     if (bdrv_is_encrypted(bs)) {
>         printf("encrypted: yes\n");
>     }
> +    if (bdrv_is_dirty(bs)) {
> +        printf("dirty,need check: yes\n");
> +    }

I suggest avoiding the comma and just saying "needs check: yes\n".
Kevin Wolf - Jan. 11, 2012, 2:47 p.m.
Am 11.01.2012 15:35, schrieb Stefan Hajnoczi:
> On Sat, Dec 31, 2011 at 9:06 AM, Dong Xu Wang
> <wdongxu@linux.vnet.ibm.com> wrote:
>> +int bdrv_is_dirty(BlockDriverState *bs)
> 
> bool would be nicer instead of int.  Traditionally we used int but C99
> has been around for a long time now and it's more appropriate.
> 
>> diff --git a/qemu-img.c b/qemu-img.c
>> index 01cc0d3..a79c274 100644
>> --- a/qemu-img.c
>> +++ b/qemu-img.c
>> @@ -1153,6 +1153,9 @@ static int img_info(int argc, char **argv)
>>     if (bdrv_is_encrypted(bs)) {
>>         printf("encrypted: yes\n");
>>     }
>> +    if (bdrv_is_dirty(bs)) {
>> +        printf("dirty,need check: yes\n");
>> +    }
> 
> I suggest avoiding the comma and just saying "needs check: yes\n".

In fact I would reverse the logic and make it something like "cleanly
shut down: no", it will better describe the situation when the VM is
still running. Same for the function names, "dirty" could mean anything.

Kevin

Patch

diff --git a/block.c b/block.c
index 3f072f6..24fd774 100644
--- a/block.c
+++ b/block.c
@@ -186,6 +186,20 @@  static void bdrv_io_limits_intercept(BlockDriverState *bs,
     qemu_co_queue_next(&bs->throttled_reqs);
 }
 
+/* check if the image is dirty */
+int bdrv_is_dirty(BlockDriverState *bs)
+{
+    BlockDriver *drv = bs->drv;
+
+    if (!drv) {
+        return 0;
+    }
+    if (!drv->bdrv_is_dirty) {
+        return 0;
+    }
+    return drv->bdrv_is_dirty(bs);
+}
+
 /* check if the path starts with "<protocol>:" */
 static int path_has_protocol(const char *path)
 {
diff --git a/block.h b/block.h
index 3bd4398..e3f3b55 100644
--- a/block.h
+++ b/block.h
@@ -104,6 +104,8 @@  void bdrv_io_limits_enable(BlockDriverState *bs);
 void bdrv_io_limits_disable(BlockDriverState *bs);
 bool bdrv_io_limits_enabled(BlockDriverState *bs);
 
+int bdrv_is_dirty(BlockDriverState *bs);
+
 void bdrv_init(void);
 void bdrv_init_with_whitelist(void);
 BlockDriver *bdrv_find_protocol(const char *filename);
diff --git a/block_int.h b/block_int.h
index 311bd2a..46afffb 100644
--- a/block_int.h
+++ b/block_int.h
@@ -84,6 +84,7 @@  struct BlockDriver {
     int (*bdrv_create)(const char *filename, QEMUOptionParameter *options);
     int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
     int (*bdrv_make_empty)(BlockDriverState *bs);
+    int (*bdrv_is_dirty)(BlockDriverState *bs);
     /* aio */
     BlockDriverAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs,
         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
diff --git a/qemu-img.c b/qemu-img.c
index 01cc0d3..a79c274 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1153,6 +1153,9 @@  static int img_info(int argc, char **argv)
     if (bdrv_is_encrypted(bs)) {
         printf("encrypted: yes\n");
     }
+    if (bdrv_is_dirty(bs)) {
+        printf("dirty,need check: yes\n");
+    }
     if (bdrv_get_info(bs, &bdi) >= 0) {
         if (bdi.cluster_size != 0) {
             printf("cluster_size: %d\n", bdi.cluster_size);