[lvm-devel] [PATCH] update dmeventd plugins to use proper lvm2_log_fn_t

[Takahiro Yasui]

Hi Mike,

I built the latest lvm2 but the following error messages were
displayed.

dmeventd_mirror.c: In function 'register_device':
dmeventd_mirror.c:256: warning: passing argument 1 of 'lvm2_log_fn' from incompatible pointer type
...
dmeventd_snapshot.c: In function 'register_device':
dmeventd_snapshot.c:170: warning: passing argument 1 of 'lvm2_log_fn' from incompatible pointer type

The prototype definition in lvm2cmd.h also needs to be updated.

Thanks,
Taka

-- 
Takahiro Yasui
Hitachi Computer Products (America), Inc.


Signed-off-by: Takahiro Yasui <tyasui at redhat.com>
---
 tools/lvm2cmd.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: LVM2.02.53-20090925/tools/lvm2cmd.h
===================================================================
--- LVM2.02.53-20090925.orig/tools/lvm2cmd.h
+++ LVM2.02.53-20090925/tools/lvm2cmd.h
@@ -18,7 +18,7 @@

 #ifndef _LVM_LOG_H
 typedef void (*lvm2_log_fn_t) (int level, const char *file, int line,
-                              const char *message);
+                              int dm_errno, const char *message);
 #endif

 #define LVM2_LOG_SUPPRESS      0


Mike Snitzer wrote:
> The dmeventd plugins provide their own _temporary_log_fn.  But they were
> not updated when lvm2_log_fn_t was last updated, see:
> http://sources.redhat.com/git/?p=lvm2.git;a=commit;h=0ed40c04c
> 
> I verified this patch fixes a SEGV seen in the dmeventd snapshot plugin:
> 
> # lvs
>   LV          VG   Attr   LSize   Origin Snap%  Move Log Copy%  Convert
>   testlv      test owi-a- 300.00M
>   testlv_snap test swi-ao  52.00M testlv  92.68
> # vgchange --monitor y test
>   2 logical volume(s) in volume group "test" monitored
> 
> and messages file shows:
> 
> Sep 16 21:15:05 really-raw dmeventd[12522]: dmeventd ready for processing.
> Sep 16 21:15:11 really-raw lvm[12522]: Monitoring snapshot test-testlv_snap
> Sep 16 21:15:15 really-raw lvm[12522]: Snapshot test-testlv_snap is now 92% full.
> 
> Signed-off-by: Mike Snitzer <snitzer at redhat.com>
> 
> ---
> diff --git a/daemons/dmeventd/plugins/mirror/dmeventd_mirror.c b/daemons/dmeventd/plugins/mirror/dmeventd_mirror.c
> index 8869e80..503ec0d 100644
> --- a/daemons/dmeventd/plugins/mirror/dmeventd_mirror.c
> +++ b/daemons/dmeventd/plugins/mirror/dmeventd_mirror.c
> @@ -126,8 +126,10 @@ out_parse:
>  	return ME_IGNORE;
>  }
>  
> -static void _temporary_log_fn(int level, const char *file __attribute((unused)),
> +static void _temporary_log_fn(int level,
> +			      const char *file __attribute((unused)),
>  			      int line __attribute((unused)),
> +			      int dm_errno __attribute((unused)),
>  			      const char *format)
>  {
>  	if (!strncmp(format, "WARNING: ", 9) && (level < 5))
> diff --git a/daemons/dmeventd/plugins/snapshot/dmeventd_snapshot.c b/daemons/dmeventd/plugins/snapshot/dmeventd_snapshot.c
> index 3e250af..96c4688 100644
> --- a/daemons/dmeventd/plugins/snapshot/dmeventd_snapshot.c
> +++ b/daemons/dmeventd/plugins/snapshot/dmeventd_snapshot.c
> @@ -57,6 +57,7 @@ static pthread_mutex_t _event_mutex = PTHREAD_MUTEX_INITIALIZER;
>  static void _temporary_log_fn(int level,
>  			      const char *file __attribute((unused)),
>  			      int line __attribute((unused)),
> +			      int dm_errno __attribute((unused)),
>  			      const char *format)
>  {
>  	if (!strncmp(format, "WARNING: ", 9) && (level < 5))
> 
> --
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