[Xen-changelog] Log the tdb_error when a read fails with EIO. This is happening after a long

[Xen patchbot -3.0-testing <patchbot-3.0-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User emellor@xxxxxxxxxxxxxxxxxxxxxx
# Node ID 1be3cb670cf22b55b7bb49f7c8aec3e16fa6e28f
# Parent  a63af74b1b6ee771db316a2a52ab0eaa4326da7f
Log the tdb_error when a read fails with EIO.  This is happening after a long
time under load -- hopefully this message will suggest why.

Signed-off-by: Ewan Mellor <ewan@xxxxxxxxxxxxx>

diff -r a63af74b1b6e -r 1be3cb670cf2 tools/xenstore/xenstored_core.c
--- a/tools/xenstore/xenstored_core.c   Wed Mar  8 22:57:46 2006
+++ b/tools/xenstore/xenstored_core.c   Wed Mar  8 22:57:53 2006
@@ -404,16 +404,19 @@
        TDB_DATA key, data;
        uint32_t *p;
        struct node *node;
+       TDB_CONTEXT * context = tdb_context(conn);
 
        key.dptr = (void *)name;
        key.dsize = strlen(name);
-       data = tdb_fetch(tdb_context(conn), key);
+       data = tdb_fetch(context, key);
 
        if (data.dptr == NULL) {
-               if (tdb_error(tdb_context(conn)) == TDB_ERR_NOEXIST)
+               if (tdb_error(context) == TDB_ERR_NOEXIST)
                        errno = ENOENT;
-               else
+               else {
+                       log("TDB error on read: %s", tdb_errorstr(context));
                        errno = EIO;
+               }
                return NULL;
        }
 

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