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From 984e95fcbdb19c2495851322a4c33f34291ecfab Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Fri, 29 Oct 2021 21:02:54 +0100
Subject: [PATCH] vddk: Simplify detection of VDDK symbols and baseline 6.5
Make all symbols from VDDK 6.5 into required symbols and use a single
error message function if one of these is missing. The new error is:
nbdkit: error: required VDDK symbol "VixDiskLib_Wait" is
missing. VDDK version must be >= 6.5. See nbdkit-vddk-plugin(1) man
page section "SUPPORTED VERSIONS OF VDDK". Original dlopen error:
vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.6: undefined
symbol: VixDiskLib_Wait
Remove the extra check and assert.
Be more consistent about #define OPTIONAL_STUB(fn,ret,args) STUB(fn,ret,args)
when we want the optional and required stubs to do the same thing.
(cherry picked from commit ec0d22e61881efa39a69d02ccb9e4ede8bf95e75)
---
plugins/vddk/stats.c | 2 +-
plugins/vddk/vddk-stubs.h | 45 ++++++++++++++++++---------------------
plugins/vddk/vddk.c | 36 ++++++++++++-------------------
plugins/vddk/vddk.h | 2 +-
4 files changed, 37 insertions(+), 48 deletions(-)
diff --git a/plugins/vddk/stats.c b/plugins/vddk/stats.c
index 18a42714..76e0c244 100644
--- a/plugins/vddk/stats.c
+++ b/plugins/vddk/stats.c
@@ -89,7 +89,7 @@ display_stats (void)
if (!vddk_debug_stats) return;
#define STUB(fn,ret,args) statlist_append (&stats, stats_##fn)
-#define OPTIONAL_STUB(fn,ret,args) statlist_append (&stats, stats_##fn)
+#define OPTIONAL_STUB(fn,ret,args) STUB(fn,ret,args)
#include "vddk-stubs.h"
#undef STUB
#undef OPTIONAL_STUB
diff --git a/plugins/vddk/vddk-stubs.h b/plugins/vddk/vddk-stubs.h
index 66353691..7d8644c3 100644
--- a/plugins/vddk/vddk-stubs.h
+++ b/plugins/vddk/vddk-stubs.h
@@ -39,10 +39,7 @@
* function name, return value, arguments.
*/
-/* Required stubs, present in all versions of VDDK that we support. I
- * have checked that all these exist in at least VDDK 5.5.5 (2015).
- */
-
+/* Required stubs, present in all versions of VDDK since 6.5 (Nov 2016). */
STUB (VixDiskLib_InitEx,
VixError,
(uint32_t major, uint32_t minor,
@@ -103,27 +100,27 @@ STUB (VixDiskLib_Write,
uint64_t start_sector, uint64_t nr_sectors,
const unsigned char *buf));
-/* Added in VDDK 6.0, these will be NULL in earlier versions. */
-OPTIONAL_STUB (VixDiskLib_Flush,
- VixError,
- (VixDiskLibHandle handle));
-OPTIONAL_STUB (VixDiskLib_ReadAsync,
- VixError,
- (VixDiskLibHandle handle,
- uint64_t start_sector, uint64_t nr_sectors,
- unsigned char *buf,
- VixDiskLibCompletionCB callback, void *data));
-OPTIONAL_STUB (VixDiskLib_WriteAsync,
- VixError,
- (VixDiskLibHandle handle,
- uint64_t start_sector, uint64_t nr_sectors,
- const unsigned char *buf,
- VixDiskLibCompletionCB callback, void *data));
+/* Added in VDDK 6.0. */
+STUB (VixDiskLib_Flush,
+ VixError,
+ (VixDiskLibHandle handle));
+STUB (VixDiskLib_ReadAsync,
+ VixError,
+ (VixDiskLibHandle handle,
+ uint64_t start_sector, uint64_t nr_sectors,
+ unsigned char *buf,
+ VixDiskLibCompletionCB callback, void *data));
+STUB (VixDiskLib_WriteAsync,
+ VixError,
+ (VixDiskLibHandle handle,
+ uint64_t start_sector, uint64_t nr_sectors,
+ const unsigned char *buf,
+ VixDiskLibCompletionCB callback, void *data));
-/* Added in VDDK 6.5, this will be NULL in earlier versions. */
-OPTIONAL_STUB (VixDiskLib_Wait,
- VixError,
- (VixDiskLibHandle handle));
+/* Added in VDDK 6.5. */
+STUB (VixDiskLib_Wait,
+ VixError,
+ (VixDiskLibHandle handle));
/* Added in VDDK 6.7, these will be NULL for earlier versions: */
OPTIONAL_STUB (VixDiskLib_QueryAllocatedBlocks,
diff --git a/plugins/vddk/vddk.c b/plugins/vddk/vddk.c
index f967e2d9..271b5ee0 100644
--- a/plugins/vddk/vddk.c
+++ b/plugins/vddk/vddk.c
@@ -63,7 +63,7 @@ NBDKIT_DLL_PUBLIC int vddk_debug_datapath = 1;
* initialized when the plugin is loaded (by vddk_get_ready).
*/
#define STUB(fn,ret,args) ret (*fn) args
-#define OPTIONAL_STUB(fn,ret,args) ret (*fn) args
+#define OPTIONAL_STUB(fn,ret,args) STUB(fn,ret,args)
#include "vddk-stubs.h"
#undef STUB
#undef OPTIONAL_STUB
@@ -282,6 +282,17 @@ vddk_config (const char *key, const char *value)
return 0;
}
+static void
+missing_required_symbol (const char *fn)
+{
+ nbdkit_error ("required VDDK symbol \"%s\" is missing. "
+ "VDDK version must be >= 6.5. "
+ "See nbdkit-vddk-plugin(1) man page section \"SUPPORTED VERSIONS OF VDDK\". "
+ "Original dlopen error: %s\n",
+ fn, dlerror ());
+ exit (EXIT_FAILURE);
+}
+
/* Load the VDDK library. */
static void
load_library (bool load_error_is_fatal)
@@ -358,32 +369,13 @@ load_library (bool load_error_is_fatal)
#define STUB(fn,ret,args) \
do { \
fn = dlsym (dl, #fn); \
- if (fn == NULL) { \
- nbdkit_error ("required VDDK symbol \"%s\" is missing: %s", \
- #fn, dlerror ()); \
- exit (EXIT_FAILURE); \
- } \
+ if (fn == NULL) \
+ missing_required_symbol (#fn); \
} while (0)
#define OPTIONAL_STUB(fn,ret,args) fn = dlsym (dl, #fn)
#include "vddk-stubs.h"
#undef STUB
#undef OPTIONAL_STUB
-
- /* Additionally, VDDK version must be >= 6.5. This was the first
- * version which introduced VixDiskLib_Wait symbol so we can check
- * for that.
- */
- if (VixDiskLib_Wait == NULL) {
- nbdkit_error ("VDDK version must be >= 6.5. "
- "See nbdkit-vddk-plugin(1) man page section \"SUPPORTED VERSIONS OF VDDK\".");
- exit (EXIT_FAILURE);
- }
-
- /* Added in VDDK 6.0 so it must always be present. Since we are
- * going to call this function unconditionally, fail early and hard
- * if for some reason it's not present.
- */
- assert (VixDiskLib_Flush != NULL);
}
static int
diff --git a/plugins/vddk/vddk.h b/plugins/vddk/vddk.h
index be0b3492..0e3dd79e 100644
--- a/plugins/vddk/vddk.h
+++ b/plugins/vddk/vddk.h
@@ -76,7 +76,7 @@ extern int vddk_debug_datapath;
extern int vddk_debug_stats;
#define STUB(fn,ret,args) extern ret (*fn) args
-#define OPTIONAL_STUB(fn,ret,args) extern ret (*fn) args
+#define OPTIONAL_STUB(fn,ret,args) STUB(fn,ret,args)
#include "vddk-stubs.h"
#undef STUB
#undef OPTIONAL_STUB
--
2.31.1
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