splice engine: support for vmsplice to user space

[fio.git] / blktrace.c

diff --git a/blktrace.c b/blktrace.c
index 5825d29714e13627dd9712699a904f752445cd70..8ebbae6f2fbe788c3c2ee353385535dac68c90ce 100644 (file)
--- a/blktrace.c
+++ b/blktrace.c
@@ -3,6 +3,8 @@
  */
 #include <stdio.h>
 #include <stdlib.h>
+#include <sys/stat.h>
+#include <dirent.h>
 
 #include "list.h"
 #include "fio.h"
@@ -95,6 +97,83 @@ int is_blktrace(const char *filename)
        return 0;
 }
 
+static int lookup_device(char *path, unsigned int maj, unsigned int min)
+{
+       struct dirent *dir;
+       struct stat st;
+       int found = 0;
+       DIR *D;
+
+       D = opendir(path);
+       if (!D)
+               return 0;
+
+       while ((dir = readdir(D)) != NULL) {
+               char full_path[256];
+
+               if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
+                       continue;
+
+               sprintf(full_path, "%s/%s", path, dir->d_name);
+               if (lstat(full_path, &st) == -1) {
+                       perror("lstat");
+                       break;
+               }
+
+               if (S_ISDIR(st.st_mode)) {
+                       found = lookup_device(full_path, maj, min);
+                       if (found) {
+                               strcpy(path, full_path);
+                               break;
+                       }
+               }
+
+               if (!S_ISBLK(st.st_mode))
+                       continue;
+
+               if (maj == major(st.st_rdev) && min == minor(st.st_rdev)) {
+                       strcpy(path, full_path);
+                       found = 1;
+                       break;
+               }
+       }
+
+       closedir(D);
+       return found;
+}
+
+#define FMINORBITS     20
+#define FMINORMASK     ((1U << FMINORBITS) - 1)
+#define FMAJOR(dev)    ((unsigned int) ((dev) >> FMINORBITS))
+#define FMINOR(dev)    ((unsigned int) ((dev) & FMINORMASK))
+
+static void trace_add_file(struct thread_data *td, __u32 device)
+{
+       static unsigned int last_maj, last_min;
+       unsigned int maj = FMAJOR(device);
+       unsigned int min = FMINOR(device);
+       struct fio_file *f;
+       char dev[256];
+       unsigned int i;
+
+       if (last_maj == maj && last_min == min)
+               return;
+
+       last_maj = maj;
+       last_min = min;
+
+       /*
+        * check for this file in our list
+        */
+       for_each_file(td, f, i)
+               if (f->major == maj && f->minor == min)
+                       return;
+
+       strcpy(dev, "/dev");
+       if (lookup_device(dev, maj, min))
+               add_file(td, dev);
+}
+
 /*
  * Store blk_io_trace data in an ipo for later retrieval.
  */
@@ -136,6 +215,8 @@ static void handle_trace(struct thread_data *td, struct blk_io_trace *t,
        if (t->action & BLK_TC_ACT(BLK_TC_NOTIFY))
                return;
 
+       trace_add_file(td, t->device);
+
        rw = (t->action & BLK_TC_ACT(BLK_TC_WRITE)) != 0;
 
        if (t->bytes > bs[rw])