Add --readonly option

[fio.git] / diskutil.c

diff --git a/diskutil.c b/diskutil.c
index 399aced467e0c855884b3c1ea4d7c09752d1f97d..bbaa22d56b2a7cab19960c94349e02e385e5af0c 100644 (file)
--- a/diskutil.c
+++ b/diskutil.c
@@ -79,7 +79,7 @@ void update_io_ticks(void)
        }
 }
 
-static int disk_util_exists(int major, int minor)
+static struct disk_util *disk_util_exists(int major, int minor)
 {
        struct list_head *entry;
        struct disk_util *du;
@@ -88,10 +88,10 @@ static int disk_util_exists(int major, int minor)
                du = list_entry(entry, struct disk_util, list);
 
                if (major == du->major && minor == du->minor)
-                       return 1;
+                       return du;
        }
 
-       return 0;
+       return NULL;
 }
 
 static void disk_util_add(int majdev, int mindev, char *path)
@@ -104,6 +104,7 @@ static void disk_util_add(int majdev, int mindev, char *path)
        INIT_LIST_HEAD(&du->list);
        sprintf(du->path, "%s/stat", path);
        du->name = strdup(basename(path));
+       du->sysfs_root = path;
        du->major = majdev;
        du->minor = mindev;
 
@@ -204,18 +205,22 @@ static void __init_disk_util(struct thread_data *td, struct fio_file *f)
 {
        struct stat st;
        char foo[PATH_MAX], tmp[PATH_MAX];
+       struct disk_util *du;
        int mindev, majdev;
        char *p;
 
-       if (!stat(f->file_name, &st)) {
+       if (!lstat(f->file_name, &st)) {
                if (S_ISBLK(st.st_mode)) {
                        majdev = major(st.st_rdev);
                        mindev = minor(st.st_rdev);
                } else if (S_ISCHR(st.st_mode)) {
                        majdev = major(st.st_rdev);
                        mindev = minor(st.st_rdev);
-                       fio_lookup_raw(st.st_rdev, &majdev, &mindev);
-               } else {
+                       if (fio_lookup_raw(st.st_rdev, &majdev, &mindev))
+                               return;
+               } else if (S_ISFIFO(st.st_mode))
+                       return;
+               else {
                        majdev = major(st.st_dev);
                        mindev = minor(st.st_dev);
                }
@@ -234,8 +239,13 @@ static void __init_disk_util(struct thread_data *td, struct fio_file *f)
                mindev = minor(st.st_dev);
        }
 
-       if (disk_util_exists(majdev, mindev))
+       du = disk_util_exists(majdev, mindev);
+       if (du) {
+               if (td->o.ioscheduler && !td->sysfs_root)
+                       td->sysfs_root = strdup(du->sysfs_root);
+
                return;
+       }
 
        /*
         * for an fs without a device, we will repeatedly stat through
@@ -303,6 +313,9 @@ void show_disk_util(void)
        struct disk_util *du;
        double util;
 
+       if (list_empty(&disk_list))
+               return;
+
        log_info("\nDisk stats (read/write):\n");
 
        list_for_each(entry, &disk_list) {