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authorJoel Sherrill <joel.sherrill@OARcorp.com>1998-11-23 19:07:58 +0000
committerJoel Sherrill <joel.sherrill@OARcorp.com>1998-11-23 19:07:58 +0000
commit07a3253de2c3f9bc2d96a351680ec72548dadd2d (patch)
treeb4f85e78927202cffe01b194c708c3dd800d8e57 /cpukit/libfs/src/imfs/imfs_unlink.c
parentcd3fb80a263a5d998c8386141fad2d6b42a6224a (diff)
downloadrtems-07a3253de2c3f9bc2d96a351680ec72548dadd2d.tar.bz2
Added base version of file system infrastructure. This includes a major
overhaul of the RTEMS system call interface. This base file system is the "In-Memory File System" aka IMFS. The design and implementation was done by the following people: + Joel Sherrill (joel@OARcorp.com) + Jennifer Averett (jennifer@OARcorp.com) + Steve "Mr Mount" Salitasc (salitasc@OARcorp.com) + Kerwin Wade (wade@OARcorp.com) PROBLEMS ======== + It is VERY likely that merging this will break the UNIX port. This can/will be fixed. + There is likely some reentrancy/mutual exclusion needed. + Eventually, there should be a "mini-IMFS" description table to eliminate links, symlinks, etc to save memory. All you need to have "classic RTEMS" functionality is technically directories and device IO. All the rest could be left out to save memory.
Diffstat (limited to 'cpukit/libfs/src/imfs/imfs_unlink.c')
-rw-r--r--cpukit/libfs/src/imfs/imfs_unlink.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/cpukit/libfs/src/imfs/imfs_unlink.c b/cpukit/libfs/src/imfs/imfs_unlink.c
new file mode 100644
index 0000000000..4e0ca26b2a
--- /dev/null
+++ b/cpukit/libfs/src/imfs/imfs_unlink.c
@@ -0,0 +1,67 @@
+/*
+ * IMFS_unlink
+ *
+ * Routine to remove a link node from the tree.
+ *
+ * COPYRIGHT (c) 1989-1998.
+ * On-Line Applications Research Corporation (OAR).
+ * Copyright assigned to U.S. Government, 1994.
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.OARcorp.com/rtems/license.html.
+ *
+ * $Id$
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+
+#include "imfs.h"
+#include "libio_.h"
+
+int IMFS_unlink(
+ rtems_filesystem_location_info_t *loc /* IN */
+)
+{
+ IMFS_jnode_t *node;
+ rtems_filesystem_location_info_t the_link;
+ int result;
+
+ node = loc->node_access;
+
+ /*
+ * Decrement the link counter of node pointed to and free the
+ * space.
+ */
+
+ /*
+ * If this is the last last pointer to the node
+ * free the node.
+ */
+
+ if ( node->type == IMFS_HARD_LINK ) {
+
+ if ( !node->info.hard_link.link_node )
+ set_errno_and_return_minus_one( EINVAL );
+
+ the_link = *loc;
+ the_link.node_access = node->info.hard_link.link_node;
+
+ /*
+ * If this is the last referance to the node
+ * Free the node that the link points to.
+ */
+ node->info.hard_link.link_node->st_nlink --;
+ IMFS_update_ctime( node->info.hard_link.link_node );
+ if ( node->info.hard_link.link_node->st_nlink < 1) {
+ result = IMFS_rmnod( &the_link );
+ if ( result != 0 )
+ return -1;
+ }
+ }
+
+ result = IMFS_rmnod( loc );
+
+ return result;
+}