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authoraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2009-04-18 15:36:23 +0000
committeraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2009-04-18 15:36:23 +0000
commitc48101ae92c5ac6f2412ca345d9cc3557add8e47 (patch)
tree0f36093f419d62a0681cf322ae12ec46a140d596 /qemu-io.c
parentqemu-io: Fix handling of bdrv_is_allocated() return value (Kevin Wolf) (diff)
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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
Diffstat (limited to 'qemu-io.c')
-rw-r--r--qemu-io.c44
1 files changed, 40 insertions, 4 deletions
diff --git a/qemu-io.c b/qemu-io.c
index 750e7acca..405b6c5e0 100644
--- a/qemu-io.c
+++ b/qemu-io.c
@@ -192,6 +192,7 @@ read_help(void)
" 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 @@ read_f(int argc, char **argv)
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 @@ read_f(int argc, char **argv)
case 'p':
pflag = 1;
break;
+ case 'P':
+ Pflag = 1;
+ pattern = atoi(optarg);
+ break;
case 'q':
qflag = 1;
break;
@@ -270,6 +277,17 @@ read_f(int argc, char **argv)
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 @@ static const cmdinfo_t read_cmd = {
.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 @@ readv_help(void)
" 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 @@ readv_f(int argc, char **argv)
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 @@ readv_f(int argc, char **argv)
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 @@ static const cmdinfo_t readv_cmd = {
.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,
};