int
rtems_rfs_file_set_size (rtems_rfs_file_handle* handle,
rtems_rfs_pos new_size)
{
rtems_rfs_block_map* map = rtems_rfs_file_map (handle);
rtems_rfs_pos size;
int rc;
if (rtems_rfs_trace (RTEMS_RFS_TRACE_FILE_IO))
printf ("rtems-rfs: file-set-size: size=%" PRIu64 "\n", new_size);
size = rtems_rfs_file_size (handle);
/*
* If the file is same size do nothing else grow or shrink it ?
*
* If the file does not change size do not update the times.
*/
if (size != new_size)
{
/*
* Short cut for the common truncate on open call.
*/
if (new_size == 0)
{
rc = rtems_rfs_block_map_free_all (rtems_rfs_file_fs (handle), map);
if (rc > 0)
return rc;
}
else
{
if (size < new_size)
{
/*
* Grow. Fill with 0's.
*/
rtems_rfs_pos count;
uint32_t length;
bool read_block;
count = new_size - size;
length = rtems_rfs_fs_block_size (rtems_rfs_file_fs (handle));
read_block = false;
while (count)
{
rtems_rfs_buffer_block block;
rtems_rfs_block_pos bpos;
uint8_t* dst;
/*
* Get the block position for the current end of the file as seen by
* the map. If not found and the EOF grow the map then fill the block
* with 0.
*/
rtems_rfs_block_size_get_bpos (rtems_rfs_block_map_size (map), &bpos);
rc = rtems_rfs_block_map_find (rtems_rfs_file_fs (handle),
map, &bpos, &block);
if (rc > 0)
{
/*
* Have we reached the EOF ?
*/
if (rc != ENXIO)
return rc;
rc = rtems_rfs_block_map_grow (rtems_rfs_file_fs (handle),
map, 1, &block);
if (rc > 0)
return rc;
}
if (count < (length - bpos.boff))
{
length = count + bpos.boff;
read_block = true;
rtems_rfs_block_map_set_size_offset (map, length);
}
else
{
rtems_rfs_block_map_set_size_offset (map, 0);
}
/*
* Only read the block if the length is not the block size.
*/
rc = rtems_rfs_buffer_handle_request (rtems_rfs_file_fs (handle),
rtems_rfs_file_buffer (handle),
block, read_block);
if (rc > 0)
return rc;
dst = rtems_rfs_buffer_data (&handle->buffer);
memset (dst + bpos.boff, 0, length - bpos.boff);
rtems_rfs_buffer_mark_dirty (rtems_rfs_file_buffer (handle));
rc = rtems_rfs_buffer_handle_release (rtems_rfs_file_fs (handle),
rtems_rfs_file_buffer (handle));
if (rc > 0)
return rc;
count -= length - bpos.boff;
}
}
else
{
/*
* Shrink
*/
rtems_rfs_block_no blocks;
uint32_t offset;
blocks =
rtems_rfs_block_map_count (map) -
(((new_size - 1) /
rtems_rfs_fs_block_size (rtems_rfs_file_fs (handle))) + 1);
offset =
new_size % rtems_rfs_fs_block_size (rtems_rfs_file_fs (handle));
if (blocks)
{
int rc;
rc = rtems_rfs_block_map_shrink (rtems_rfs_file_fs (handle),
rtems_rfs_file_map (handle),
blocks);
if (rc > 0)
return rc;
}
rtems_rfs_block_map_set_size_offset (map, offset);
if (rtems_rfs_block_pos_past_end (rtems_rfs_file_bpos (handle),
rtems_rfs_block_map_size (map)))
rtems_rfs_block_size_get_bpos (rtems_rfs_block_map_size (map),
rtems_rfs_file_bpos (handle));
}
}
handle->shared->size.count = rtems_rfs_block_map_count (map);
handle->shared->size.offset = rtems_rfs_block_map_size_offset (map);
if (rtems_rfs_file_update_mtime (handle))
handle->shared->mtime = time (NULL);
}
return 0;
}
int
rtems_rfs_dir_del_entry (rtems_rfs_file_system* fs,
rtems_rfs_inode_handle* dir,
rtems_rfs_ino ino,
uint32_t offset)
{
rtems_rfs_block_map map;
rtems_rfs_block_no block;
rtems_rfs_buffer_handle buffer;
bool search;
int rc;
if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY))
printf ("rtems-rfs: dir-del-entry: dir=%" PRId32 ", entry=%" PRId32 " offset=%" PRIu32 "\n",
rtems_rfs_inode_ino (dir), ino, offset);
rc = rtems_rfs_block_map_open (fs, dir, &map);
if (rc > 0)
return rc;
rc = rtems_rfs_block_map_seek (fs, &map, offset, &block);
if (rc > 0)
{
if (rc == ENXIO)
rc = ENOENT;
rtems_rfs_block_map_close (fs, &map);
return rc;
}
rc = rtems_rfs_buffer_handle_open (fs, &buffer);
if (rc > 0)
{
rtems_rfs_block_map_close (fs, &map);
return rc;
}
/*
* Only search if the offset is 0 else we are at that position.
*/
search = offset ? false : true;
while (rc == 0)
{
uint8_t* entry;
int eoffset;
rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, true);
if (rc > 0)
{
if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY))
printf ("rtems-rfs: dir-del-entry: "
"block buffer req failed for ino %" PRIu32 ": %d: %s\n",
rtems_rfs_inode_ino (dir), rc, strerror (rc));
break;
}
/*
* If we are searching start at the beginning of the block. If not searching
* skip to the offset in the block.
*/
if (search)
eoffset = 0;
else
eoffset = offset % rtems_rfs_fs_block_size (fs);
entry = rtems_rfs_buffer_data (&buffer) + eoffset;
while (eoffset < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE))
{
rtems_rfs_ino eino;
int elength;
elength = rtems_rfs_dir_entry_length (entry);
eino = rtems_rfs_dir_entry_ino (entry);
if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY)
break;
if (rtems_rfs_dir_entry_valid (fs, elength, eino))
{
if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY))
printf ("rtems-rfs: dir-del-entry: "
"bad length or ino for ino %" PRIu32 ": %u/%" PRId32
" @ %" PRIu32 ".%04x\n",
rtems_rfs_inode_ino (dir), elength, eino, block, eoffset);
rc = EIO;
break;
}
if (ino == rtems_rfs_dir_entry_ino (entry))
{
uint32_t remaining;
remaining = rtems_rfs_fs_block_size (fs) - (eoffset + elength);
memmove (entry, entry + elength, remaining);
memset (entry + remaining, 0xff, elength);
/*
* If the remainder of the block is empty and this is the start of the
* block and it is the last block in the map shrink the map.
*
* @note We could check again to see if the new end block in the map is
* also empty. This way we could clean up an empty directory.
*/
elength = rtems_rfs_dir_entry_length (entry);
if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY))
printf ("rtems-rfs: dir-del-entry: "
"last block free for ino %" PRIu32 ": elength=%i block=%" PRIu32
" offset=%d last=%s\n",
ino, elength, block, eoffset,
rtems_rfs_block_map_last (&map) ? "yes" : "no");
if ((elength == RTEMS_RFS_DIR_ENTRY_EMPTY) &&
(eoffset == 0) && rtems_rfs_block_map_last (&map))
{
rc = rtems_rfs_block_map_shrink (fs, &map, 1);
if (rc > 0)
{
if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY))
printf ("rtems-rfs: dir-del-entry: "
"block map shrink failed for ino %" PRIu32 ": %d: %s\n",
rtems_rfs_inode_ino (dir), rc, strerror (rc));
}
}
rtems_rfs_buffer_mark_dirty (&buffer);
rtems_rfs_buffer_handle_close (fs, &buffer);
rtems_rfs_block_map_close (fs, &map);
return 0;
}
if (!search)
{
rc = EIO;
break;
}
entry += elength;
eoffset += elength;
}
if (rc == 0)
{
rc = rtems_rfs_block_map_next_block (fs, &map, &block);
if (rc == ENXIO)
rc = ENOENT;
}
}
rtems_rfs_buffer_handle_close (fs, &buffer);
rtems_rfs_block_map_close (fs, &map);
return rc;
}
int
rtems_rfs_block_map_free_all (rtems_rfs_file_system* fs,
rtems_rfs_block_map* map)
{
return rtems_rfs_block_map_shrink (fs, map, map->size.count);
}
