Changeset 08232ee in mainline for uspace/srv/bd/file_bd/file_bd.c

Timestamp:

2010-01-09T21:52:07Z (15 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

9245413

Parents:

dccf721

Message:

Obtain block device size automatically, if possible. Implement ftell(). Fix seek implementation in VFS if whence == SEEK_END.

File:

• uspace/srv/bd/file_bd/file_bd.c (modified) (4 diffs)

uspace/srv/bd/file_bd/file_bd.c

@@ -56 +56 @@
 
 static const size_t block_size = 512;
+static bn_t num_blocks;
 static FILE *img;
 
@@ -99 +100 @@
 {
         int rc;
+        long img_size;
 
         rc = devmap_driver_register(NAME, file_bd_connection);
@@ -109 +111 @@
         if (img == NULL)
                 return EINVAL;
+
+        if (fseek(img, 0, SEEK_END) != 0) {
+                fclose(img);
+                return EIO;
+        }
+
+        img_size = ftell(img);
+        if (img_size < 0) {
+                fclose(img);
+                return EIO;
+        }
+
+        num_blocks = img_size / block_size;
 
         fibril_mutex_initialize(&dev_lock);
@@ -174 +189 @@
                         ipc_answer_1(callid, EOK, block_size);
                         continue;
+                case BD_GET_NUM_BLOCKS:
+                        ipc_answer_2(callid, EOK, LOWER32(num_blocks),
+                            UPPER32(num_blocks));
+                        continue;
                 default:
                         retval = EINVAL;