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-rw-r--r--cpukit/libfs/src/imfs/imfs_initsupp.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/cpukit/libfs/src/imfs/imfs_initsupp.c b/cpukit/libfs/src/imfs/imfs_initsupp.c
new file mode 100644
index 0000000000..47e1d392e8
--- /dev/null
+++ b/cpukit/libfs/src/imfs/imfs_initsupp.c
@@ -0,0 +1,119 @@
+/*
+ * IMFS Initialization
+ *
+ * COPYRIGHT (c) 1989-2010.
+ * On-Line Applications Research Corporation (OAR).
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.com/license/LICENSE.
+ *
+ * $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/types.h> /* for mkdir */
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include "imfs.h"
+#include <rtems/libio_.h>
+#include <rtems/seterr.h>
+
+#if defined(IMFS_DEBUG)
+#include <stdio.h>
+#endif
+
+/*
+ * IMFS_determine_bytes_per_block
+ */
+int imfs_memfile_bytes_per_block = 0;
+
+static int IMFS_determine_bytes_per_block(
+ int *dest_bytes_per_block,
+ int requested_bytes_per_block,
+ int default_bytes_per_block
+)
+{
+ bool is_valid = false;
+ int bit_mask;
+
+ /*
+ * check, whether requested bytes per block is valid
+ */
+ for (bit_mask = 16; !is_valid && (bit_mask <= 512); bit_mask <<= 1) {
+ if (bit_mask == requested_bytes_per_block) {
+ is_valid = true;
+ break;
+ }
+ if(bit_mask > requested_bytes_per_block)
+ break;
+ }
+ *dest_bytes_per_block = ((is_valid)
+ ? requested_bytes_per_block
+ : default_bytes_per_block);
+ return 0;
+}
+
+
+/*
+ * IMFS_initialize
+ */
+int IMFS_initialize_support(
+ rtems_filesystem_mount_table_entry_t *temp_mt_entry,
+ const rtems_filesystem_operations_table *op_table,
+ const rtems_filesystem_file_handlers_r *memfile_handlers,
+ const rtems_filesystem_file_handlers_r *directory_handlers,
+ const rtems_filesystem_file_handlers_r *fifo_handlers
+)
+{
+ static int imfs_instance;
+ IMFS_fs_info_t *fs_info;
+ IMFS_jnode_t *jnode;
+
+ /*
+ * determine/check value for imfs_memfile_bytes_per_block
+ */
+ IMFS_determine_bytes_per_block(&imfs_memfile_bytes_per_block,
+ imfs_rq_memfile_bytes_per_block,
+ IMFS_MEMFILE_DEFAULT_BYTES_PER_BLOCK);
+
+ /*
+ * Create the root node
+ *
+ * NOTE: UNIX root is 755 and owned by root/root (0/0).
+ */
+ temp_mt_entry->mt_fs_root.node_access = IMFS_create_root_node();
+ temp_mt_entry->mt_fs_root.handlers = directory_handlers;
+ temp_mt_entry->mt_fs_root.ops = op_table;
+ temp_mt_entry->pathconf_limits_and_options = IMFS_LIMITS_AND_OPTIONS;
+
+ /*
+ * Create custom file system data.
+ */
+ fs_info = calloc( 1, sizeof( IMFS_fs_info_t ) );
+ if ( !fs_info ) {
+ free(temp_mt_entry->mt_fs_root.node_access);
+ rtems_set_errno_and_return_minus_one(ENOMEM);
+ }
+ temp_mt_entry->fs_info = fs_info;
+
+ /*
+ * Set st_ino for the root to 1.
+ */
+
+ fs_info->instance = imfs_instance++;
+ fs_info->ino_count = 1;
+ fs_info->memfile_handlers = memfile_handlers;
+ fs_info->directory_handlers = directory_handlers;
+ fs_info->fifo_handlers = fifo_handlers;
+
+ jnode = temp_mt_entry->mt_fs_root.node_access;
+ jnode->st_ino = fs_info->ino_count;
+
+ return 0;
+}