Returns the refcounts stored in the given block.
(
&mut self,
raw_file: &mut QcowRawFile,
table_index: usize,
)
| 231 | |
| 232 | /// Returns the refcounts stored in the given block. |
| 233 | pub fn refcount_block( |
| 234 | &mut self, |
| 235 | raw_file: &mut QcowRawFile, |
| 236 | table_index: usize, |
| 237 | ) -> Result<Option<&[u64]>> { |
| 238 | let block_addr_disk = *self.ref_table.get(table_index).ok_or(Error::InvalidIndex)?; |
| 239 | if block_addr_disk == 0 { |
| 240 | return Ok(None); |
| 241 | } |
| 242 | if !self.refblock_cache.contains_key(table_index) { |
| 243 | let table = VecCache::from_vec( |
| 244 | raw_file |
| 245 | .read_refcount_block(block_addr_disk) |
| 246 | .map_err(Error::ReadingRefCounts)?, |
| 247 | ); |
| 248 | // TODO(dgreid) - closure needs to return an error. |
| 249 | let ref_table = &self.ref_table; |
| 250 | self.refblock_cache |
| 251 | .insert(table_index, table, |index, evicted| { |
| 252 | raw_file.write_refcount_block(ref_table[index], evicted.get_values()) |
| 253 | }) |
| 254 | .map_err(Error::EvictingRefCounts)?; |
| 255 | } |
| 256 | // The index must exist as it was just inserted if it didn't already. |
| 257 | Ok(Some( |
| 258 | self.refblock_cache.get(table_index).unwrap().get_values(), |
| 259 | )) |
| 260 | } |
| 261 | |
| 262 | // Gets the address of the refcount block and the index into the block for the given address. |
| 263 | fn get_refcount_index(&self, address: u64) -> (usize, usize) { |
nothing calls this directly
no test coverage detected