tools/xenstore: remove support of file backed data base

In order to prepare the replacement of TDB with direct accessible nodes
in memory, remove the support for a file backed data base.

This allows to remove xs_tdb_dump, too.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Julien Grall <jgrall@amazon.com>

.gitignore

@@ -248,7 +248,6 @@ tools/xenstore/xenstore-rm
 tools/xenstore/xenstore-watch
 tools/xenstore/xenstore-write
 tools/xenstore/xenstored
-tools/xenstore/xs_tdb_dump
 tools/xentop/xentop
 tools/xentrace/xentrace_setsize
 tools/xentrace/tbctl

tools/xenstore/Makefile

@@ -29,7 +29,7 @@ CLIENTS += xenstore-write xenstore-ls xenstore-watch
 
 TARGETS := xenstore $(CLIENTS) xenstore-control
 ifeq ($(XENSTORE_XENSTORED),y)
-TARGETS += xs_tdb_dump xenstored
+TARGETS += xenstored
 endif
 
 .PHONY: all
@@ -50,9 +50,6 @@ xenstore: xenstore_client.o xs_lib.o
 xenstore-control: xenstore_control.o
 	$(CC) $(LDFLAGS) $^ $(LDLIBS) -o $@ $(APPEND_LDFLAGS)
 
-xs_tdb_dump: xs_tdb_dump.o utils.o tdb.o talloc.o
-	$(CC) $(LDFLAGS) $^ -o $@ $(APPEND_LDFLAGS)
-
 .PHONY: clean
 clean::
 	$(RM) $(TARGETS) $(DEPS_RM)

tools/xenstore/xenstored_core.c

@@ -2301,8 +2301,6 @@ static void accept_connection(int sock)
 }
 #endif
 
-static int tdb_flags = TDB_INTERNAL | TDB_NOLOCK;
-
 /* We create initial nodes manually. */
 static void manual_node(const char *name, const char *child)
 {
@@ -2354,14 +2352,11 @@ void setup_structure(bool live_update)
 {
 	char *tdbname;
 
-	tdbname = talloc_strdup(talloc_autofree_context(), xs_daemon_tdb());
+	tdbname = talloc_strdup(talloc_autofree_context(), "/dev/mem");
 	if (!tdbname)
 		barf_perror("Could not create tdbname");
 
-	if (!(tdb_flags & TDB_INTERNAL))
-		unlink(tdbname);
-
-	tdb_ctx = tdb_open_ex(tdbname, 7919, tdb_flags,
+	tdb_ctx = tdb_open_ex(tdbname, 7919, TDB_INTERNAL | TDB_NOLOCK,
 			      O_RDWR | O_CREAT | O_EXCL | O_CLOEXEC,
 			      0640, &tdb_logger, NULL);
 	if (!tdb_ctx)
@@ -2659,8 +2654,6 @@ static void usage(void)
 "                          watch-event: time a watch-event is kept pending\n"
 "  -R, --no-recovery       to request that no recovery should be attempted when\n"
 "                          the store is corrupted (debug only),\n"
-"  -I, --internal-db [on|off] store database in memory, not on disk, default is\n"
-"                          memory, with \"--internal-db off\" it is on disk\n"
 "  -K, --keep-orphans      don't delete nodes owned by a domain when the\n"
 "                          domain is deleted (this is a security risk!)\n"
 "  -V, --verbose           to request verbose execution.\n");
@@ -2687,7 +2680,6 @@ static struct option options[] = {
 	{ "quota-soft", 1, NULL, 'q' },
 	{ "timeout", 1, NULL, 'w' },
 	{ "no-recovery", 0, NULL, 'R' },
-	{ "internal-db", 2, NULL, 'I' },
 	{ "keep-orphans", 0, NULL, 'K' },
 	{ "verbose", 0, NULL, 'V' },
 	{ "watch-nb", 1, NULL, 'W' },
@@ -2811,7 +2803,7 @@ int main(int argc, char *argv[])
 	orig_argv = argv;
 
 	while ((opt = getopt_long(argc, argv,
-				  "DE:F:HI::KNPS:t:A:M:Q:q:T:RVW:w:U",
+				  "DE:F:H::KNPS:t:A:M:Q:q:T:RVW:w:U",
 				  options, NULL)) != -1) {
 		switch (opt) {
 		case 'D':
@@ -2848,10 +2840,6 @@ int main(int argc, char *argv[])
 			if (set_trace_switch(optarg))
 				barf("Illegal trace switch \"%s\"\n", optarg);
 			break;
-		case 'I':
-			if (optarg && !strcmp(optarg, "off"))
-				tdb_flags = 0;
-			break;
 		case 'K':
 			keep_orphans = true;
 			break;

tools/xenstore/xs_tdb_dump.c

@@ -1,86 +0,0 @@
-/* Simple program to dump out all records of TDB */
-#include <stdint.h>
-#include <stdlib.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <string.h>
-#include <sys/types.h>
-#include "xenstore_lib.h"
-#include "tdb.h"
-#include "talloc.h"
-#include "utils.h"
-
-static uint32_t total_size(struct xs_tdb_record_hdr *hdr)
-{
-	return sizeof(*hdr) + hdr->num_perms * sizeof(struct xs_permissions) 
-		+ hdr->datalen + hdr->childlen;
-}
-
-static char perm_to_char(unsigned int perm)
-{
-	return perm == XS_PERM_READ ? 'r' :
-		perm == XS_PERM_WRITE ? 'w' :
-		perm == XS_PERM_NONE ? '-' :
-		perm == (XS_PERM_READ|XS_PERM_WRITE) ? 'b' :
-		'?';
-}
-
-static void tdb_logger(TDB_CONTEXT *tdb, int level, const char * fmt, ...)
-{
-	va_list ap;
-
-	va_start(ap, fmt);
-	vfprintf(stderr, fmt, ap);
-	va_end(ap);
-}
-
-int main(int argc, char *argv[])
-{
-	TDB_DATA key;
-	TDB_CONTEXT *tdb;
-
-	if (argc != 2)
-		barf("Usage: xs_tdb_dump <tdbfile>");
-
-	tdb = tdb_open_ex(talloc_strdup(NULL, argv[1]), 0, 0, O_RDONLY, 0,
-			  &tdb_logger, NULL);
-	if (!tdb)
-		barf_perror("Could not open %s", argv[1]);
-
-	key = tdb_firstkey(tdb);
-	while (key.dptr) {
-		TDB_DATA data;
-		struct xs_tdb_record_hdr *hdr;
-
-		data = tdb_fetch(tdb, key);
-		hdr = (void *)data.dptr;
-		if (data.dsize < sizeof(*hdr))
-			fprintf(stderr, "%.*s: BAD truncated\n",
-				(int)key.dsize, key.dptr);
-		else if (data.dsize != total_size(hdr))
-			fprintf(stderr, "%.*s: BAD length %zu for %u/%u/%u (%u)\n",
-				(int)key.dsize, key.dptr, data.dsize,
-				hdr->num_perms, hdr->datalen,
-				hdr->childlen, total_size(hdr));
-		else {
-			unsigned int i;
-			char *p;
-
-			printf("%.*s: ", (int)key.dsize, key.dptr);
-			for (i = 0; i < hdr->num_perms; i++)
-				printf("%s%c%u",
-				       i == 0 ? "" : ",",
-				       perm_to_char(hdr->perms[i].perms),
-				       hdr->perms[i].id);
-			p = (void *)&hdr->perms[hdr->num_perms];
-			printf(" %.*s\n", hdr->datalen, p);
-			p += hdr->datalen;
-			for (i = 0; i < hdr->childlen; i += strlen(p+i)+1)
-				printf("\t-> %s\n", p+i);
-		}
-		key = tdb_nextkey(tdb, key);
-	}
-	return 0;
-}
-