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authorKevin Wolf <kwolf@redhat.com>2012-12-06 14:32:58 +0100
committerKevin Wolf <kwolf@redhat.com>2012-12-12 12:33:48 +0100
commit41c695c749b84d40e53e64faadedc0392aaea07e (patch)
treec6baf246fdb0c89ee86dc378b5a51d4498de919a /qemu-io.c
parent3c90c65d7adab49a41952ee14e1d65f81355e408 (diff)
qemu-io: Add AIO debugging commands
This makes the blkdebug suspend/resume functionality available in qemu-io. Use it like this: $ ./qemu-io blkdebug::/tmp/test.qcow2 qemu-io> break write_aio req_a qemu-io> aio_write 0 4k qemu-io> blkdebug: Suspended request 'req_a' qemu-io> resume req_a blkdebug: Resuming request 'req_a' qemu-io> wrote 4096/4096 bytes at offset 0 4 KiB, 1 ops; 0:00:30.71 (133.359788 bytes/sec and 0.0326 ops/sec) Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'qemu-io.c')
-rw-r--r--qemu-io.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/qemu-io.c b/qemu-io.c
index b4b0898741..1637773302 100644
--- a/qemu-io.c
+++ b/qemu-io.c
@@ -1671,6 +1671,67 @@ static const cmdinfo_t map_cmd = {
.oneline = "prints the allocated areas of a file",
};
+static int break_f(int argc, char **argv)
+{
+ int ret;
+
+ ret = bdrv_debug_breakpoint(bs, argv[1], argv[2]);
+ if (ret < 0) {
+ printf("Could not set breakpoint: %s\n", strerror(-ret));
+ }
+
+ return 0;
+}
+
+static const cmdinfo_t break_cmd = {
+ .name = "break",
+ .argmin = 2,
+ .argmax = 2,
+ .cfunc = break_f,
+ .args = "event tag",
+ .oneline = "sets a breakpoint on event and tags the stopped "
+ "request as tag",
+};
+
+static int resume_f(int argc, char **argv)
+{
+ int ret;
+
+ ret = bdrv_debug_resume(bs, argv[1]);
+ if (ret < 0) {
+ printf("Could not resume request: %s\n", strerror(-ret));
+ }
+
+ return 0;
+}
+
+static const cmdinfo_t resume_cmd = {
+ .name = "resume",
+ .argmin = 1,
+ .argmax = 1,
+ .cfunc = resume_f,
+ .args = "tag",
+ .oneline = "resumes the request tagged as tag",
+};
+
+static int wait_break_f(int argc, char **argv)
+{
+ while (!bdrv_debug_is_suspended(bs, argv[1])) {
+ qemu_aio_wait();
+ }
+
+ return 0;
+}
+
+static const cmdinfo_t wait_break_cmd = {
+ .name = "wait_break",
+ .argmin = 1,
+ .argmax = 1,
+ .cfunc = wait_break_f,
+ .args = "tag",
+ .oneline = "waits for the suspension of a request",
+};
+
static int abort_f(int argc, char **argv)
{
abort();
@@ -1934,6 +1995,9 @@ int main(int argc, char **argv)
add_command(&discard_cmd);
add_command(&alloc_cmd);
add_command(&map_cmd);
+ add_command(&break_cmd);
+ add_command(&resume_cmd);
+ add_command(&wait_break_cmd);
add_command(&abort_cmd);
add_args_command(init_args_command);