[PATCH] Add support for the read/write interface of SG v3
[fio.git] / fio.c
diff --git a/fio.c b/fio.c
index ccceaa58949464100fac0b7376037cde49e3d4a1..5c45cae7f64103e0a8e30b16d7f704a2680f45e8 100644 (file)
--- a/fio.c
+++ b/fio.c
@@ -302,7 +302,7 @@ static int get_next_offset(struct thread_data *td, unsigned long long *offset)
                b = td->last_pos / td->min_bs;
 
        *offset = (b * td->min_bs) + td->file_offset;
-       if (*offset > td->file_size)
+       if (*offset > td->real_file_size)
                return 1;
 
        return 0;
@@ -628,8 +628,8 @@ static struct io_u *get_io_u(struct thread_data *td)
                return NULL;
        }
 
-       if (io_u->buflen + io_u->offset > td->file_size)
-               io_u->buflen = td->file_size - io_u->offset;
+       if (io_u->buflen + io_u->offset > td->real_file_size)
+               io_u->buflen = td->real_file_size - io_u->offset;
 
        if (!io_u->buflen) {
                put_io_u(td, io_u);
@@ -1203,8 +1203,10 @@ static int file_size(struct thread_data *td)
                return 1;
        }
 
-       if (!td->file_size)
-               td->file_size = st.st_size;
+       td->real_file_size = st.st_size;
+
+       if (!td->file_size || td->file_size > td->real_file_size)
+               td->file_size = td->real_file_size;
 
        return 0;
 }
@@ -1220,33 +1222,37 @@ static int bdev_size(struct thread_data *td)
                return 1;
        }
 
+       td->real_file_size = bytes;
+
        /*
         * no extend possibilities, so limit size to device size if too large
         */
-       if (!td->file_size || td->file_size > bytes)
-               td->file_size = bytes;
+       if (!td->file_size || td->file_size > td->real_file_size)
+               td->file_size = td->real_file_size;
 
        return 0;
 }
 
 static int get_file_size(struct thread_data *td)
 {
-       int ret;
+       int ret = 0;
 
        if (td->filetype == FIO_TYPE_FILE)
                ret = file_size(td);
-       else
+       else if (td->filetype == FIO_TYPE_BD)
                ret = bdev_size(td);
+       else
+               td->real_file_size = -1;
 
        if (ret)
                return ret;
 
-       if (td->file_offset > td->file_size) {
-               fprintf(stderr, "Client%d: offset larger than length (%Lu > %Lu)\n", td->thread_number, td->file_offset, td->file_size);
+       if (td->file_offset + td->file_size > td->real_file_size) {
+               fprintf(stderr, "Client%d: offset extends end (%Lu > %Lu)\n", td->thread_number, td->file_offset + td->file_size, td->real_file_size);
                return 1;
        }
 
-       td->io_size = td->file_size - td->file_offset;
+       td->io_size = td->file_size;
        if (td->io_size == 0) {
                fprintf(stderr, "Client%d: no io blocks\n", td->thread_number);
                td_verror(td, EINVAL);
@@ -1352,9 +1358,14 @@ static int setup_file(struct thread_data *td)
        if (td->odirect)
                flags |= O_DIRECT;
 
-       if (td_read(td))
-               td->fd = open(td->file_name, flags | O_RDONLY);
-       else {
+       if (td_read(td)) {
+               if (td->filetype == FIO_TYPE_CHAR)
+                       flags |= O_RDWR;
+               else
+                       flags |= O_RDONLY;
+
+               td->fd = open(td->file_name, flags);
+       } else {
                if (td->filetype == FIO_TYPE_FILE) {
                        if (!td->overwrite)
                                flags |= O_TRUNC;
@@ -1595,17 +1606,23 @@ static void init_disk_util(struct thread_data *td)
                return;
 
        /*
-        * if this is inside a partition dir, jump back to parent
+        * for md/dm, there's no queue dir. we already have the right place
         */
-       sprintf(tmp, "%s/queue", foo);
+       sprintf(tmp, "%s/stat", foo);
        if (stat(tmp, &st)) {
-               p = dirname(foo);
-               sprintf(tmp, "%s/queue", p);
+               /*
+                * if this is inside a partition dir, jump back to parent
+                */
+               sprintf(tmp, "%s/queue", foo);
                if (stat(tmp, &st)) {
-                       fprintf(stderr, "unknown sysfs layout\n");
-                       return;
+                       p = dirname(foo);
+                       sprintf(tmp, "%s/queue", p);
+                       if (stat(tmp, &st)) {
+                               fprintf(stderr, "unknown sysfs layout\n");
+                               return;
+                       }
+                       sprintf(foo, "%s", p);
                }
-               sprintf(foo, "%s", p);
        }
 
        disk_util_add(dev, foo);