Patchwork [PULL,08/26] raw_bsd: emit debug events in bdrv_co_readv() and bdrv_co_writev()

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Submitter Kevin Wolf
Date Aug. 30, 2013, 2:30 p.m.
Message ID <1377873051-18981-9-git-send-email-kwolf@redhat.com>
Download mbox | patch
Permalink /patch/271309/
State New
Headers show

Comments

Kevin Wolf - Aug. 30, 2013, 2:30 p.m.
From: Laszlo Ersek <lersek@redhat.com>

On 08/05/13 15:03, Paolo Bonzini wrote:
>
> [...]
>
> 1) BlockDriver is a struct in which these function members are
> interesting:
>
>     .bdrv_reopen_prepare
>     .bdrv_co_readv
>     .bdrv_co_writev
>     .bdrv_co_is_allocated
>     .bdrv_co_write_zeroes
>     .bdrv_co_discard
>     .bdrv_getlength
>     .bdrv_get_info
>     .bdrv_truncate
>     .bdrv_is_inserted
>     .bdrv_media_changed
>     .bdrv_eject
>     .bdrv_lock_medium
>     .bdrv_ioctl
>     .bdrv_aio_ioctl
>     .bdrv_has_zero_init
>
> They should be implemented as simple forwarders (see above). There are
> 16 functions listed here, you can easily see how this already accounts
> for 100+ SLOC roughly...
>
> The implementations of bdrv_co_readv and bdrv_co_writev should also call
> BLKDBG_EVENT on bs->file too, before forwarding to bs->file.  The events
> to be generated are BLKDBG_READ_AIO and BLKDBG_WRITE_AIO.

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/raw_bsd.c | 2 ++
 1 file changed, 2 insertions(+)

Patch

diff --git a/block/raw_bsd.c b/block/raw_bsd.c
index 5c17d53..19091a3 100644
--- a/block/raw_bsd.c
+++ b/block/raw_bsd.c
@@ -33,11 +33,13 @@  static TYPE raw_reopen_prepare(BlockDriverState *bs)
 
 static TYPE raw_co_readv(BlockDriverState *bs)
 {
+    BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
     return bdrv_co_readv(bs->file);
 }
 
 static TYPE raw_co_writev(BlockDriverState *bs)
 {
+    BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);
     return bdrv_co_writev(bs->file);
 }