int IMFS_evaluate_hard_link(
rtems_filesystem_location_info_t *node, /* IN/OUT */
int flags /* IN */
)
{
IMFS_jnode_t *jnode = node->node_access;
int result = 0;
/*
* Check for things that should never happen.
*/
if ( jnode->type != IMFS_HARD_LINK )
rtems_fatal_error_occurred (0xABCD0000);
/*
* Set the hard link value and the handlers.
*/
node->node_access = jnode->info.hard_link.link_node;
IMFS_Set_handlers( node );
/*
* Verify we have the correct permissions for this node.
*/
if ( !IMFS_evaluate_permission( node, flags ) )
rtems_set_errno_and_return_minus_one( EACCES );
return result;
}
int IMFS_initialize_support(
rtems_filesystem_mount_table_entry_t *mt_entry,
const void *data
)
{
const IMFS_mount_data *mount_data = data;
IMFS_fs_info_t *fs_info = mount_data->fs_info;
IMFS_jnode_t *root_node;
fs_info->mknod_controls = mount_data->mknod_controls;
root_node = IMFS_initialize_node(
&fs_info->Root_directory.Node,
&fs_info->mknod_controls->directory->node_control,
"",
0,
(S_IFDIR | 0755),
NULL
);
IMFS_assert( root_node != NULL );
mt_entry->fs_info = fs_info;
mt_entry->ops = mount_data->ops;
mt_entry->pathconf_limits_and_options = &IMFS_LIMITS_AND_OPTIONS;
mt_entry->mt_fs_root->location.node_access = root_node;
IMFS_Set_handlers( &mt_entry->mt_fs_root->location );
IMFS_determine_bytes_per_block(
&imfs_memfile_bytes_per_block,
imfs_rq_memfile_bytes_per_block,
IMFS_MEMFILE_DEFAULT_BYTES_PER_BLOCK
);
return 0;
}
int IMFS_unlink(
rtems_filesystem_location_info_t *parentloc, /* IN */
rtems_filesystem_location_info_t *loc /* IN */
)
{
IMFS_jnode_t *node;
rtems_filesystem_location_info_t the_link;
int result = 0;
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 )
rtems_set_errno_and_return_minus_one( EINVAL );
the_link = *loc;
the_link.node_access = node->info.hard_link.link_node;
IMFS_Set_handlers( &the_link );
/*
* If removing the last hard link to a node, then we need
* to remove the node that is a link and the node itself.
*/
if ( node->info.hard_link.link_node->st_nlink == 1)
{
result = (*the_link.handlers->rmnod_h)( parentloc, &the_link );
if ( result != 0 )
return -1;
}
else
{
node->info.hard_link.link_node->st_nlink --;
IMFS_update_ctime( node->info.hard_link.link_node );
}
}
/*
* Now actually free the node we were asked to free.
*/
result = (*loc->handlers->rmnod_h)( parentloc, loc );
return result;
}
int IMFS_evaluate_sym_link(
rtems_filesystem_location_info_t *node, /* IN/OUT */
int flags /* IN */
)
{
IMFS_jnode_t *jnode = node->node_access;
int result = 0;
int i;
/*
* Check for things that should never happen.
*/
if ( jnode->type != IMFS_SYM_LINK )
rtems_fatal_error_occurred (0xABCD0000);
if ( !jnode->Parent )
rtems_fatal_error_occurred( 0xBAD00000 );
/*
* Move the node_access to either the symbolic links parent or
* root depending on the symbolic links path.
*/
node->node_access = jnode->Parent;
rtems_filesystem_get_sym_start_loc(
jnode->info.sym_link.name,
&i,
node
);
/*
* Use eval path to evaluate the path of the symbolic link.
*/
result = IMFS_eval_path(
&jnode->info.sym_link.name[i],
strlen( &jnode->info.sym_link.name[i] ),
flags,
node
);
IMFS_Set_handlers( node );
/*
* Verify we have the correct permissions for this node.
*/
if ( !IMFS_evaluate_permission( node, flags ) )
rtems_set_errno_and_return_minus_one( EACCES );
return result;
}
int IMFS_initialize_support(
rtems_filesystem_mount_table_entry_t *mt_entry,
const rtems_filesystem_operations_table *op_table,
const IMFS_node_control *const node_controls [IMFS_TYPE_COUNT]
)
{
static int imfs_instance;
int rv = 0;
IMFS_fs_info_t *fs_info = calloc( 1, sizeof( *fs_info ) );
if ( fs_info != NULL ) {
IMFS_jnode_t *root_node;
fs_info->instance = imfs_instance++;
memcpy(
fs_info->node_controls,
node_controls,
sizeof( fs_info->node_controls )
);
root_node = IMFS_allocate_node(
fs_info,
fs_info->node_controls [IMFS_DIRECTORY],
"",
0,
(S_IFDIR | 0755),
NULL
);
if ( root_node != NULL ) {
mt_entry->fs_info = fs_info;
mt_entry->ops = op_table;
mt_entry->pathconf_limits_and_options = &IMFS_LIMITS_AND_OPTIONS;
mt_entry->mt_fs_root->location.node_access = root_node;
IMFS_Set_handlers( &mt_entry->mt_fs_root->location );
} else {
errno = ENOMEM;
rv = -1;
}
} else {
errno = ENOMEM;
rv = -1;
}
if ( rv == 0 ) {
IMFS_determine_bytes_per_block(
&imfs_memfile_bytes_per_block,
imfs_rq_memfile_bytes_per_block,
IMFS_MEMFILE_DEFAULT_BYTES_PER_BLOCK
);
}
return rv;
}
static int IMFS_stat_hard_link(
const rtems_filesystem_location_info_t *loc,
struct stat *buf
)
{
const IMFS_link_t *hard_link = loc->node_access;
rtems_filesystem_location_info_t targetloc = *loc;
targetloc.node_access = hard_link->link_node;
IMFS_Set_handlers( &targetloc );
return (targetloc.handlers->fstat_h)( &targetloc, buf );
}
void 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
*/
loc = temp_mt_entry->mt_fs_root->location;
jnode = (IMFS_jnode_t *)loc.node_access;
/*
* Set this to null to indicate that it is being unmounted.
*/
temp_mt_entry->mt_fs_root->location.node_access = NULL;
do {
next = jnode->Parent;
loc.node_access = (void *)jnode;
IMFS_Set_handlers( &loc );
if ( !IMFS_is_directory( jnode ) || jnode_has_no_children( jnode ) ) {
result = IMFS_rmnod( NULL, &loc );
if ( result != 0 )
rtems_fatal_error_occurred( 0xdeadbeef );
IMFS_node_destroy( jnode );
jnode = next;
}
if ( jnode != NULL ) {
if ( IMFS_is_directory( jnode ) ) {
if ( jnode_has_children( jnode ) )
jnode = jnode_get_first_child( jnode );
}
}
} while (jnode != NULL);
}
static int IMFS_stat_link(
const rtems_filesystem_location_info_t *loc,
struct stat *buf
)
{
const IMFS_jnode_t *node = loc->node_access;
if ( IMFS_type( node ) != IMFS_HARD_LINK ) {
buf->st_size = strlen( node->info.sym_link.name );
return IMFS_stat( loc, buf );
} else {
rtems_filesystem_location_info_t targetloc = *loc;
targetloc.node_access = node->info.hard_link.link_node;
IMFS_Set_handlers( &targetloc );
return (targetloc.handlers->fstat_h)( &targetloc, buf );
}
}
static rtems_filesystem_eval_path_generic_status IMFS_eval_token(
rtems_filesystem_eval_path_context_t *ctx,
void *arg,
const char *token,
size_t tokenlen
)
{
rtems_filesystem_eval_path_generic_status status =
RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_DONE;
rtems_filesystem_location_info_t *currentloc =
rtems_filesystem_eval_path_get_currentloc( ctx );
IMFS_jnode_t *dir = currentloc->node_access;
bool access_ok = rtems_filesystem_eval_path_check_access(
ctx,
RTEMS_FS_PERMS_EXEC,
dir->st_mode,
dir->st_uid,
dir->st_gid
);
if ( access_ok ) {
IMFS_jnode_t *entry = IMFS_search_in_directory( dir, token, tokenlen );
if ( entry != NULL ) {
bool terminal = !rtems_filesystem_eval_path_has_path( ctx );
int eval_flags = rtems_filesystem_eval_path_get_flags( ctx );
bool follow_hard_link = (eval_flags & RTEMS_FS_FOLLOW_HARD_LINK) != 0;
bool follow_sym_link = (eval_flags & RTEMS_FS_FOLLOW_SYM_LINK) != 0;
IMFS_jnode_types_t type = IMFS_type( entry );
rtems_filesystem_eval_path_clear_token( ctx );
if ( type == IMFS_HARD_LINK && (follow_hard_link || !terminal)) {
entry = entry->info.hard_link.link_node;
}
if ( type == IMFS_SYM_LINK && (follow_sym_link || !terminal)) {
const char *target = entry->info.sym_link.name;
rtems_filesystem_eval_path_recursive( ctx, target, strlen( target ) );
} else {
rtems_filesystem_global_location_t **fs_root_ptr =
IMFS_is_mount_point( entry, type );
if ( fs_root_ptr == NULL ) {
--dir->reference_count;
++entry->reference_count;
currentloc->node_access = entry;
currentloc->node_access_2 =
IMFS_generic_get_context_by_node( entry );
IMFS_Set_handlers( currentloc );
if ( !terminal ) {
status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_CONTINUE;
}
} else {
access_ok = rtems_filesystem_eval_path_check_access(
ctx,
RTEMS_FS_PERMS_EXEC,
entry->st_mode,
entry->st_uid,
entry->st_gid
);
if ( access_ok ) {
rtems_filesystem_eval_path_restart( ctx, fs_root_ptr );
}
}
}
} else {
status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_NO_ENTRY;
}
}
return status;
}
int IMFS_eval_path(
const char *pathname, /* IN */
size_t pathnamelen, /* IN */
int flags, /* IN */
rtems_filesystem_location_info_t *pathloc /* IN/OUT */
)
{
int i = 0;
int len;
IMFS_token_types type = IMFS_CURRENT_DIR;
char token[ IMFS_NAME_MAX + 1 ];
IMFS_jnode_t *node;
int result;
if ( !rtems_libio_is_valid_perms( flags ) ) {
assert( 0 );
rtems_set_errno_and_return_minus_one( EIO );
}
/*
* This was filled in by the caller and is valid in the
* mount table.
*/
node = pathloc->node_access;
/*
* Evaluate all tokens until we are done or an error occurs.
*/
while( (type != IMFS_NO_MORE_PATH) && (type != IMFS_INVALID_TOKEN) ) {
type = IMFS_get_token( &pathname[i], pathnamelen, token, &len );
pathnamelen -= len;
i += len;
if ( !pathloc->node_access )
rtems_set_errno_and_return_minus_one( ENOENT );
/*
* I cannot move out of this directory without execute permission.
*/
if ( type != IMFS_NO_MORE_PATH )
if ( node->type == IMFS_DIRECTORY )
if ( !IMFS_evaluate_permission( pathloc, RTEMS_LIBIO_PERMS_SEARCH ) )
rtems_set_errno_and_return_minus_one( EACCES );
node = pathloc->node_access;
switch( type ) {
case IMFS_UP_DIR:
/*
* Am I at the root of all filesystems? (chroot'ed?)
*/
if ( pathloc->node_access == rtems_filesystem_root.node_access )
break; /* Throw out the .. in this case */
/*
* Am I at the root of this mounted filesystem?
*/
if (pathloc->node_access ==
pathloc->mt_entry->mt_fs_root.node_access) {
/*
* Am I at the root of all filesystems?
*/
if ( pathloc->node_access == rtems_filesystem_root.node_access ) {
break; /* Throw out the .. in this case */
} else {
*pathloc = pathloc->mt_entry->mt_point_node;
return (*pathloc->ops->evalpath_h)(&(pathname[i-len]),
pathnamelen+len,
flags,pathloc);
}
} else {
if ( !node->Parent )
rtems_set_errno_and_return_minus_one( ENOENT );
node = node->Parent;
}
pathloc->node_access = node;
break;
case IMFS_NAME:
/*
* If we are at a link follow it.
*/
if ( node->type == IMFS_HARD_LINK ) {
IMFS_evaluate_hard_link( pathloc, 0 );
node = pathloc->node_access;
if ( !node )
rtems_set_errno_and_return_minus_one( ENOTDIR );
} else if ( node->type == IMFS_SYM_LINK ) {
result = IMFS_evaluate_sym_link( pathloc, 0 );
node = pathloc->node_access;
if ( result == -1 )
return -1;
}
/*
* Only a directory can be decended into.
*/
if ( node->type != IMFS_DIRECTORY )
rtems_set_errno_and_return_minus_one( ENOTDIR );
/*
* Find the token name in the current node.
*/
node = IMFS_find_match_in_dir( node, token );
if ( !node )
rtems_set_errno_and_return_minus_one( ENOENT );
/*
* If we are at a node that is a mount point so current directory
* actually exists on the mounted file system and not in the node that
* contains the mount point node. For example a stat of the mount
* point should return the details of the root of the mounted file
* system not the mount point node of parent file system.
*
* If the node we have just moved to is a mount point do not loop and
* get the token because the token may be suitable for the mounted
* file system and not the IMFS. For example the IMFS length is
* limited. If the token is a parent directory move back up otherwise
* set loc to the new fs root node and let them finish evaluating the
* path.
*/
if (( node->type == IMFS_DIRECTORY ) && ( node->info.directory.mt_fs != NULL )) {
IMFS_skip_separator( pathname, &pathnamelen, &i);
if ((pathname[i] != '.') || (pathname[i + 1] != '.')) {
*pathloc = node->info.directory.mt_fs->mt_fs_root;
return (*pathloc->ops->evalpath_h)( &pathname[i],
pathnamelen,
flags, pathloc );
}
i += 2;
pathnamelen -= 2;
node = node->Parent;
}
/*
* Set the node access to the point we have found.
*/
pathloc->node_access = node;
break;
case IMFS_NO_MORE_PATH:
case IMFS_CURRENT_DIR:
break;
case IMFS_INVALID_TOKEN:
rtems_set_errno_and_return_minus_one( ENAMETOOLONG );
break;
}
}
/*
* Always return the root node.
*
* If we are at a node that is a mount point. Set loc to the
* new fs root node and let let the mounted filesystem set the handlers.
*
* NOTE: The behavior of stat() on a mount point appears to be questionable.
*/
if ( node->type == IMFS_DIRECTORY ) {
if ( node->info.directory.mt_fs != NULL ) {
*pathloc = node->info.directory.mt_fs->mt_fs_root;
return (*pathloc->ops->evalpath_h)( &pathname[i-len],
pathnamelen+len,
flags, pathloc );
} else {
result = IMFS_Set_handlers( pathloc );
}
} else {
result = IMFS_Set_handlers( pathloc );
}
/*
* Verify we have the correct permissions for this node.
*/
if ( !IMFS_evaluate_permission( pathloc, flags ) )
rtems_set_errno_and_return_minus_one( EACCES );
return result;
}
int IMFS_evaluate_for_make(
const char *path, /* IN */
rtems_filesystem_location_info_t *pathloc, /* IN/OUT */
const char **name /* OUT */
)
{
int i = 0;
int len;
IMFS_token_types type;
char token[ IMFS_NAME_MAX + 1 ];
IMFS_jnode_t *node;
bool done = false;
size_t pathlen;
int result;
/*
* This was filled in by the caller and is valid in the
* mount table.
*/
node = pathloc->node_access;
/*
* Get the path length.
*/
pathlen = strlen( path );
/*
* Evaluate all tokens until we are done or an error occurs.
*/
while( !done ) {
type = IMFS_get_token( &path[i], pathlen, token, &len );
pathlen -= len;
i += len;
if ( !pathloc->node_access )
rtems_set_errno_and_return_minus_one( ENOENT );
/*
* I cannot move out of this directory without execute permission.
*/
if ( type != IMFS_NO_MORE_PATH )
if ( node->type == IMFS_DIRECTORY )
if ( !IMFS_evaluate_permission( pathloc, RTEMS_LIBIO_PERMS_SEARCH ) )
rtems_set_errno_and_return_minus_one( EACCES );
node = pathloc->node_access;
switch( type ) {
case IMFS_UP_DIR:
/*
* Am I at the root of all filesystems? (chroot'ed?)
*/
if ( pathloc->node_access == rtems_filesystem_root.node_access )
break; /* Throw out the .. in this case */
/*
* Am I at the root of this mounted filesystem?
*/
if (pathloc->node_access == pathloc->mt_entry->mt_fs_root.node_access){
/*
* Am I at the root of all filesystems?
*/
if ( pathloc->node_access == rtems_filesystem_root.node_access ) {
break;
} else {
*pathloc = pathloc->mt_entry->mt_point_node;
return (*pathloc->ops->evalformake_h)( &path[i-len], pathloc, name );
}
} else {
if ( !node->Parent )
rtems_set_errno_and_return_minus_one( ENOENT );
node = node->Parent;
}
pathloc->node_access = node;
break;
case IMFS_NAME:
/*
* If we are at a link follow it.
*/
if ( node->type == IMFS_HARD_LINK ) {
result = IMFS_evaluate_link( pathloc, 0 );
if ( result == -1 )
return -1;
} else if ( node->type == IMFS_SYM_LINK ) {
result = IMFS_evaluate_link( pathloc, 0 );
if ( result == -1 )
return -1;
}
node = pathloc->node_access;
if ( !node )
rtems_set_errno_and_return_minus_one( ENOTDIR );
/*
* Only a directory can be decended into.
*/
if ( node->type != IMFS_DIRECTORY )
rtems_set_errno_and_return_minus_one( ENOTDIR );
/*
* Find the token name in the present location.
*/
node = IMFS_find_match_in_dir( node, token );
/*
* If there is no node we have found the name of the node we
* wish to create.
*/
if ( ! node )
done = true;
else {
if (( node->type == IMFS_DIRECTORY ) && ( node->info.directory.mt_fs != NULL )) {
IMFS_skip_separator( path, &pathlen, &i);
if ((path[i] != '.') || (path[i + 1] != '.')) {
*pathloc = node->info.directory.mt_fs->mt_fs_root;
return (*pathloc->ops->evalformake_h)( &path[i],
pathloc,
name );
}
i += 2;
pathlen -= 2;
node = node->Parent;
}
pathloc->node_access = node;
}
break;
case IMFS_NO_MORE_PATH:
rtems_set_errno_and_return_minus_one( EEXIST );
break;
case IMFS_INVALID_TOKEN:
rtems_set_errno_and_return_minus_one( ENAMETOOLONG );
break;
case IMFS_CURRENT_DIR:
break;
}
}
*name = &path[ i - len ];
/*
* We have evaluated the path as far as we can.
* Verify there is not any invalid stuff at the end of the name.
*/
for( ; path[i] != '\0'; i++) {
if ( !IMFS_is_separator( path[ i ] ) )
rtems_set_errno_and_return_minus_one( ENOENT );
}
/*
* Verify we can execute and write to this directory.
*/
result = IMFS_Set_handlers( pathloc );
/*
* The returned node must be a directory
*/
node = pathloc->node_access;
if ( node->type != IMFS_DIRECTORY )
rtems_set_errno_and_return_minus_one( ENOTDIR );
/*
* We must have Write and execute permission on the returned node.
*/
if ( !IMFS_evaluate_permission( pathloc, RTEMS_LIBIO_PERMS_WX ) )
rtems_set_errno_and_return_minus_one( EACCES );
return result;
}
