/*
* IMFS_memfile_extend
*
* This routine insures that the in-memory file is of the length
* specified. If necessary, it will allocate memory blocks to
* extend the file.
*/
MEMFILE_STATIC int IMFS_memfile_extend(
IMFS_jnode_t *the_jnode,
off_t new_length
)
{
unsigned int block;
unsigned int new_blocks;
unsigned int old_blocks;
/*
* Perform internal consistency checks
*/
IMFS_assert( the_jnode );
IMFS_assert( IMFS_type( the_jnode ) == IMFS_MEMORY_FILE );
/*
* Verify new file size is supported
*/
if ( new_length >= IMFS_MEMFILE_MAXIMUM_SIZE )
rtems_set_errno_and_return_minus_one( EINVAL );
/*
* Verify new file size is actually larger than current size
*/
if ( new_length <= the_jnode->info.file.size )
return 0;
/*
* Calculate the number of range of blocks to allocate
*/
new_blocks = new_length / IMFS_MEMFILE_BYTES_PER_BLOCK;
old_blocks = the_jnode->info.file.size / IMFS_MEMFILE_BYTES_PER_BLOCK;
/*
* Now allocate each of those blocks.
*/
for ( block=old_blocks ; block<=new_blocks ; block++ ) {
if ( IMFS_memfile_addblock( the_jnode, block ) ) {
for ( ; block>=old_blocks ; block-- ) {
IMFS_memfile_remove_block( the_jnode, block );
}
rtems_set_errno_and_return_minus_one( ENOSPC );
}
}
/*
* Set the new length of the file.
*/
the_jnode->info.file.size = new_length;
IMFS_update_ctime(the_jnode);
IMFS_update_mtime(the_jnode);
return 0;
}
/*
* IMFS_memfile_extend
*
* This routine insures that the in-memory file is of the length
* specified. If necessary, it will allocate memory blocks to
* extend the file.
*/
static int IMFS_memfile_extend(
IMFS_memfile_t *memfile,
bool zero_fill,
off_t new_length
)
{
unsigned int block;
unsigned int new_blocks;
unsigned int old_blocks;
unsigned int offset;
/*
* Perform internal consistency checks
*/
IMFS_assert( memfile );
/*
* Verify new file size is supported
*/
if ( new_length >= IMFS_MEMFILE_MAXIMUM_SIZE )
rtems_set_errno_and_return_minus_one( EFBIG );
/*
* Verify new file size is actually larger than current size
*/
if ( new_length <= memfile->File.size )
return 0;
/*
* Calculate the number of range of blocks to allocate
*/
new_blocks = new_length / IMFS_MEMFILE_BYTES_PER_BLOCK;
old_blocks = memfile->File.size / IMFS_MEMFILE_BYTES_PER_BLOCK;
offset = memfile->File.size - old_blocks * IMFS_MEMFILE_BYTES_PER_BLOCK;
/*
* Now allocate each of those blocks.
*/
for ( block=old_blocks ; block<=new_blocks ; block++ ) {
if ( !IMFS_memfile_addblock( memfile, block ) ) {
if ( zero_fill ) {
size_t count = IMFS_MEMFILE_BYTES_PER_BLOCK - offset;
block_p *block_ptr =
IMFS_memfile_get_block_pointer( memfile, block, 0 );
memset( &(*block_ptr) [offset], 0, count);
offset = 0;
}
} else {
for ( ; block>=old_blocks ; block-- ) {
IMFS_memfile_remove_block( memfile, block );
}
rtems_set_errno_and_return_minus_one( ENOSPC );
}
}
/*
* Set the new length of the file.
*/
memfile->File.size = new_length;
IMFS_mtime_ctime_update( &memfile->File.Node );
return 0;
}
