Add support for redirection replay of blktrace traces to another device
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/blktrace.c b/blktrace.c
index f22ab1b..9ce4ae2 100644
--- a/blktrace.c
+++ b/blktrace.c
@@ -97,7 +97,8 @@
return 0;
}
-static int lookup_device(char *path, unsigned int maj, unsigned int min)
+static int lookup_device(struct thread_data *td, char *path, unsigned int maj,
+ unsigned int min)
{
struct dirent *dir;
struct stat st;
@@ -121,7 +122,7 @@
}
if (S_ISDIR(st.st_mode)) {
- found = lookup_device(full_path, maj, min);
+ found = lookup_device(td, full_path, maj, min);
if (found) {
strcpy(path, full_path);
break;
@@ -131,6 +132,20 @@
if (!S_ISBLK(st.st_mode))
continue;
+ /*
+ * If replay_redirect is set then always return this device
+ * upon lookup which overrides the device lookup based on
+ * major minor in the actual blktrace
+ */
+ if (td->o.replay_redirect) {
+ dprint(FD_BLKTRACE, "device lookup: %d/%d\n overridden"
+ " with: %s", maj, min,
+ td->o.replay_redirect);
+ strcpy(path, td->o.replay_redirect);
+ found = 1;
+ break;
+ }
+
if (maj == major(st.st_rdev) && min == minor(st.st_rdev)) {
dprint(FD_BLKTRACE, "device lookup: %d/%d\n", maj, min);
strcpy(path, full_path);
@@ -183,7 +198,7 @@
return;
strcpy(dev, "/dev");
- if (lookup_device(dev, maj, min)) {
+ if (lookup_device(td, dev, maj, min)) {
int fileno;
dprint(FD_BLKTRACE, "add devices %s\n", dev);