Add create_xattr_loop test tool

Add a quick tool that creates xattrs in a tight loop.

Signed-off-by: Zach Brown <zab@versity.com>

tests/.gitignore

@@ -5,3 +5,4 @@ src/handle_cat
 src/bulk_create_paths
 src/find_xattrs
 src/stage_tmpfile
+src/create_xattr_loop

tests/Makefile

@@ -7,7 +7,8 @@ BIN := src/createmany			\
 	src/handle_cat			\
 	src/bulk_create_paths		\
 	src/stage_tmpfile		\
-	src/find_xattrs
+	src/find_xattrs			\
+	src/create_xattr_loop
 
 DEPS := $(wildcard src/*.d)
 

tests/src/create_xattr_loop.c

@@ -0,0 +1,113 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/xattr.h>
+#include <ctype.h>
+#include <string.h>
+#include <errno.h>
+#include <limits.h>
+
+static void exit_usage(void)
+{
+	printf(" -h/-?         output this usage message and exit\n"
+	       " -c <count>    number of xattrs to create\n"
+	       " -n <string>   xattr name prefix, -NR is appended\n"
+	       " -p <path>     string with path to file with xattrs\n" 
+	       " -s <size>     xattr value size\n");
+	exit(1);
+}
+
+int main(int argc, char **argv)
+{
+	char *pref = NULL;
+	char *path = NULL;
+	char *val;
+	char *name;
+	unsigned long long count = 0;
+	unsigned long long size = 0;
+	unsigned long long i;
+	int ret;
+	int c;
+
+	while ((c = getopt(argc, argv, "+c:n:p:s:")) != -1) {
+
+		switch (c) {
+			case 'c':
+				count = strtoull(optarg, NULL, 0);
+				break;
+			case 'n':
+				pref = strdup(optarg);
+				break;
+			case 'p':
+				path = strdup(optarg);
+				break;
+			case 's':
+				size = strtoull(optarg, NULL, 0);
+				break;
+			case '?':
+				printf("unknown argument: %c\n", optind);
+			case 'h':
+				exit_usage();
+		}
+	}
+
+	if (count == 0) {
+		printf("specify count of xattrs to create with -c\n");
+		exit(1);
+	}
+
+	if (count == ULLONG_MAX) {
+		printf("invalid -c count\n");
+		exit(1);
+	}
+
+	if (size == 0) {
+		printf("specify xattrs value size with -s\n");
+		exit(1);
+	}
+
+	if (size == ULLONG_MAX || size < 2) {
+		printf("invalid -s size\n");
+		exit(1);
+	}
+
+	if (path == NULL) {
+		printf("specify path to file with -p\n");
+		exit(1);
+	}
+
+	if (pref == NULL) {
+		printf("specify xattr name prefix string with -n\n");
+		exit(1);
+	}
+
+	ret = snprintf(NULL, 0, "%s-%llu", pref, ULLONG_MAX) + 1;
+	name = malloc(ret);
+	if (!name) {
+		printf("couldn't allocate xattr name buffer\n");
+		exit(1);
+	}
+
+	val = malloc(size);
+	if (!val) {
+		printf("couldn't allocate xattr value buffer\n");
+		exit(1);
+	}
+
+	memset(val, 'a', size - 1);
+	val[size - 1] = '\0';
+
+	for (i = 0; i < count; i++) {
+		sprintf(name, "%s-%llu", pref, i);
+
+		ret = setxattr(path, name, val, size, 0);
+		if (ret) {
+			printf("returned %d errno %d (%s)\n",
+					ret, errno, strerror(errno));
+			return 1;
+		}
+	}
+
+	return 0;
+}