Changeset 930baca in mainline for uspace/srv/fs/minixfs/mfs_utils.c

Timestamp:

2011-03-19T19:15:28Z (14 years ago)

Author:

Maurizio Lombardi <m.lombardi85@…>

Branches:

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

Children:

155f792

Parents:

0d6ab10

Message:

the read_map() function returns the data block address on disk given the position into the file

File:

• uspace/srv/fs/minixfs/mfs_utils.c (modified) (2 diffs)

uspace/srv/fs/minixfs/mfs_utils.c

@@ -32 +32 @@
 
 #include <byteorder.h>
+#include <assert.h>
+#include <errno.h>
+#include "mfs.h"
 #include "mfs_utils.h"
 
@@ -58 +61 @@
 }
 
+/*
+ *Read an indirect block from disk and convert its
+ *content to the native endian format.
+ */
+int read_ind_block(block_t *b, struct mfs_instance *inst, uint32_t block)
+{
+        int rc;
+        unsigned i;
+
+        assert(inst);
+        devmap_handle_t handle = inst->handle;
+        struct mfs_sb_info *sbi = inst->sbi;
+
+        assert(sbi);
+
+        rc = block_get(&b, handle, block, BLOCK_FLAGS_NONE);
+
+        if (rc != EOK)
+                return rc;
+
+        if (sbi->fs_version == MFS_VERSION_V1) {
+                uint16_t *pt16 = b->data;
+
+                for (i = 0; i < MFS_BLOCKSIZE / sizeof(uint16_t); ++i)
+                        pt16[i] = conv16(sbi->native, pt16[i]);
+        } else {
+                uint32_t *pt32 = b->data;
+
+                for (i = 0; i < sbi->block_size / sizeof(uint32_t); ++i)
+                        pt32[i] = conv32(sbi->native, pt32[i]);
+        }
+
+        return EOK;
+}
+
 /**
  * @}