qemu-io: Verify read data by patterns (Kevin Wolf)
This patch adds a -P option to read and readv which allows to compare the read
data to a given pattern. This can be used to verify data written by write -P.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7182 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/qemu-io.c b/qemu-io.c
index 750e7ac..405b6c5 100644
--- a/qemu-io.c
+++ b/qemu-io.c
@@ -192,6 +192,7 @@
" Reads a segment of the currently open file, optionally dumping it to the\n"
" standard output stream (with -v option) for subsequent inspection.\n"
" -p, -- use bdrv_pread to read the file\n"
+" -P, -- use a pattern to verify read data\n"
" -C, -- report statistics in a machine parsable format\n"
" -v, -- dump buffer to standard output\n"
" -q, -- quite mode, do not show I/O statistics\n"
@@ -207,8 +208,10 @@
char *buf;
int64_t offset;
int count, total;
+ int pattern = 0;
+ int Pflag = 0;
- while ((c = getopt(argc, argv, "Cpqv")) != EOF) {
+ while ((c = getopt(argc, argv, "CpP:qv")) != EOF) {
switch (c) {
case 'C':
Cflag = 1;
@@ -216,6 +219,10 @@
case 'p':
pflag = 1;
break;
+ case 'P':
+ Pflag = 1;
+ pattern = atoi(optarg);
+ break;
case 'q':
qflag = 1;
break;
@@ -270,6 +277,17 @@
return 0;
}
+ if (Pflag) {
+ void* cmp_buf = malloc(count);
+ memset(cmp_buf, pattern, count);
+ if (memcmp(buf, cmp_buf, count)) {
+ printf("Pattern verification failed at offset %lld, "
+ "%d bytes\n",
+ (long long) offset, count);
+ }
+ free(cmp_buf);
+ }
+
if (qflag)
return 0;
@@ -291,7 +309,7 @@
.cfunc = read_f,
.argmin = 2,
.argmax = -1,
- .args = "[-aCpqv] off len",
+ .args = "[-aCpqv] [-P pattern ] off len",
.oneline = "reads a number of bytes at a specified offset",
.help = read_help,
};
@@ -312,6 +330,7 @@
" standard output stream (with -v option) for subsequent inspection.\n"
" Uses multiple iovec buffers if more than one byte range is specified.\n"
" -C, -- report statistics in a machine parsable format\n"
+" -P, -- use a pattern to verify read data\n"
" -v, -- dump buffer to standard output\n"
" -q, -- quite mode, do not show I/O statistics\n"
"\n");
@@ -328,12 +347,18 @@
int count = 0, total;
int nr_iov, i;
QEMUIOVector qiov;
+ int pattern = 0;
+ int Pflag = 0;
- while ((c = getopt(argc, argv, "Cqv")) != EOF) {
+ while ((c = getopt(argc, argv, "CP:qv")) != EOF) {
switch (c) {
case 'C':
Cflag = 1;
break;
+ case 'P':
+ Pflag = 1;
+ pattern = atoi(optarg);
+ break;
case 'q':
qflag = 1;
break;
@@ -406,6 +431,17 @@
return 0;
}
+ if (Pflag) {
+ void* cmp_buf = malloc(count);
+ memset(cmp_buf, pattern, count);
+ if (memcmp(buf, cmp_buf, count)) {
+ printf("Pattern verification failed at offset %lld, "
+ "%d bytes\n",
+ (long long) offset, count);
+ }
+ free(cmp_buf);
+ }
+
if (qflag)
return 0;
@@ -426,7 +462,7 @@
.cfunc = readv_f,
.argmin = 2,
.argmax = -1,
- .args = "[-Cqv] off len [len..]",
+ .args = "[-Cqv] [-P pattern ] off len [len..]",
.oneline = "reads a number of bytes at a specified offset",
.help = readv_help,
};
