Add support for redirection replay of blktrace traces to another device

[fio.git] / blktrace.c

diff --git a/blktrace.c b/blktrace.c
index f22ab1b9f2bfb96ffe057884091c534c6848a12b..9ce4ae29c8cbe358c4ce0913e84d407721d13c17 100644 (file)
--- a/blktrace.c
+++ b/blktrace.c
@@ -97,7 +97,8 @@ int is_blktrace(const char *filename)
        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 @@ static int lookup_device(char *path, unsigned int maj, unsigned int min)
                }
 
                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 @@ static int lookup_device(char *path, unsigned int maj, unsigned int min)
                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 @@ static void trace_add_file(struct thread_data *td, __u32 device)
                        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);