From 07a3253de2c3f9bc2d96a351680ec72548dadd2d Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Mon, 23 Nov 1998 19:07:58 +0000 Subject: 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. --- c/src/libfs/src/imfs/imfs_initsupp.c | 158 +++++++++++++++++++++++++++++++++++ 1 file changed, 158 insertions(+) create mode 100644 c/src/libfs/src/imfs/imfs_initsupp.c (limited to 'c/src/libfs/src/imfs/imfs_initsupp.c') diff --git a/c/src/libfs/src/imfs/imfs_initsupp.c b/c/src/libfs/src/imfs/imfs_initsupp.c new file mode 100644 index 0000000000..bb3a0f9aea --- /dev/null +++ b/c/src/libfs/src/imfs/imfs_initsupp.c @@ -0,0 +1,158 @@ +/* + * IMFS Initialization + * + * 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 /* for mkdir */ +#include +#include +#include + +#include + +#include "imfs.h" +#include "libio_.h" + +#if defined(IMFS_DEBUG) +#include +#endif + +/* + * IMFS file system operations table + */ + +rtems_filesystem_operations_table IMFS_ops = { + IMFS_eval_path, + IMFS_evaluate_for_make, + IMFS_link, + IMFS_unlink, + IMFS_node_type, + IMFS_mknod, + IMFS_rmnod, + IMFS_chown, + IMFS_freenodinfo, + IMFS_mount, + IMFS_initialize, + IMFS_unmount, + IMFS_fsunmount, + IMFS_utime, + IMFS_evaluate_link, + IMFS_symlink, + IMFS_readlink +}; + +/* + * IMFS_initialize + */ + +int IMFS_initialize( + rtems_filesystem_mount_table_entry_t *temp_mt_entry +) +{ + IMFS_fs_info_t *fs_info; + IMFS_jnode_t *jnode; + + /* + * Create the root node + */ + + temp_mt_entry->mt_fs_root.node_access = IMFS_create_node( + NULL, + IMFS_DIRECTORY, + "", + ( S_IRWXO | S_IRWXG| S_IRWXU ), + NULL + ); + + temp_mt_entry->mt_fs_root.handlers = &dir_handlers; + temp_mt_entry->mt_fs_root.ops = &IMFS_ops; + 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); + return 1; + } + temp_mt_entry->fs_info = fs_info; + + /* + * Set st_ino for the root to 1. + */ + + fs_info->ino_count = 1; + + jnode = temp_mt_entry->mt_fs_root.node_access; + jnode->st_ino = fs_info->ino_count; + + return 0; +} + +#define jnode_get_control( jnode ) \ + (&jnode->info.directory.Entries) + +#define jnode_has_no_children( jnode ) \ + Chain_Is_empty( jnode_get_control( jnode ) ) + +#define jnode_has_children( jnode ) \ + ( ! jnode_has_no_children( jnode ) ) + +#define jnode_get_first_child( jnode ) \ + ((IMFS_jnode_t *)( Chain_Head( jnode_get_control( jnode ) )->next)) + + +int IMFS_fsunmount( + rtems_filesystem_mount_table_entry_t *temp_mt_entry +) +{ + IMFS_jnode_t *jnode; + IMFS_jnode_t *next; + rtems_filesystem_location_info_t loc; + int result = 0; + + /* + * Traverse tree that starts at the mt_fs_root and deallocate memory + * associated memory space + */ + + jnode = (IMFS_jnode_t *)temp_mt_entry->mt_fs_root.node_access; + + do { + next = jnode->Parent; + loc.node_access = (void *)jnode; + + if ( jnode->type != IMFS_DIRECTORY ) { + result = IMFS_unlink( &loc ); + if (result != 0) + return -1; + jnode = next; + } else if ( jnode_has_no_children( jnode ) ) { + result = IMFS_unlink( &loc ); + if (result != 0) + return -1; + jnode = next; + } + if ( jnode != NULL ) { + if ( jnode->type == IMFS_DIRECTORY ) { + if ( jnode_has_children( jnode ) ) + jnode = jnode_get_first_child( jnode ); + } + } + } while (jnode != NULL); + + return 0; +} + + + -- cgit v1.2.3