Changeset e272949 in mainline for uspace/lib/ext2/libext2_superblock.c

Timestamp:

2011-02-13T20:27:30Z (13 years ago)

Author:

Martin Sucha <sucha14@…>

Branches:

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

Children:

566c401

Parents:

36bca8eb

Message:

Refactor direct reading of superblock

File:

• uspace/lib/ext2/libext2_superblock.c (modified) (2 diffs)

uspace/lib/ext2/libext2_superblock.c

@@ -35 +35 @@
 
 #include "libext2.h"
+#include <errno.h>
+#include <malloc.h>
+#include <libblock.h>
 
 /**
@@ -104 +107 @@
 
 
+/** Read a superblock directly from device (i.e. no libblock cache)
+ * 
+ * @param devmap_handle Device handle of the block device.
+ * @param superblock    Pointer where to store pointer to new superblock
+ * 
+ * @return              EOK on success or negative error code on failure.
+ */
+int ext2_superblock_read_direct(devmap_handle_t devmap_handle,
+    ext2_superblock_t **superblock)
+{
+        void *data;
+        int rc;
+        
+        data = malloc(EXT2_SUPERBLOCK_SIZE);
+        if (data == NULL) {
+                return ENOMEM;
+        }
+        
+        rc = block_read_bytes_direct(devmap_handle, EXT2_SUPERBLOCK_OFFSET,
+            EXT2_SUPERBLOCK_SIZE, data);
+        if (rc != EOK) {
+                free(data);
+                return rc;
+        }
+        
+        (*superblock) = data;
+        return EOK;
+}
+
+
 /** @}
  */