fallocate only when necessary

Dependencies

• [2] WTXLZDYI Fixing bus errors on a full disk
• [3] OHUZ73MK Versions
• [4] 5LSYTRQ6 More docs, example, and fixing the free page diagnostic function for mutable transactions
• [5] DASFQGOR Debugging
• [6] OFINGD26 implementing prev() on cursors (+ some cleanup)
• [7] 6UVFCERM Formatting, debugging, etc.
• [8] 52X5P7ND Cleaning up the unsized part
• [9] OP6SVMOD Resetting history
• [10] H3FVSQIQ Unsized pages
• [*] W2MIZD5B Single file databases + CRC for the root pages (checking the other pages makes everything very slow)

Change contents

• replacement in sanakirja-core/src/btree/page_unsized.rs at line 636
  [3.18046]→[3.18046:18136](∅→∅)
  − fn modify<T: LoadPage, K: ?Sized, V: ?Sized, P: BTreeMutPage<K, V>, L: AllocWrite<K, V>>(
  [3.18046]

  [3.19129]
  + fn modify<T: LoadPage, K: core::fmt::Debug + ?Sized, V: core::fmt::Debug + ?Sized, P: BTreeMutPage<K, V>, L: AllocWrite<K, V>>(
• replacement in sanakirja-core/src/btree/page_unsized.rs at line 677
  [3.18910]→[3.18910:18940](∅→∅)
  − K: ?Sized,

  − V: ?Sized,
  [3.18910]

  [3.18940]
  + K: ?Sized + core::fmt::Debug,

  + V: ?Sized + core::fmt::Debug,
• edit in sanakirja/src/environment/mod.rs at line 321
  [12.5468]

  [12.5468]
  + fallocate(file, offset + length)?;
• edit in sanakirja/src/environment/mod.rs at line 340
  [3.103972]→[2.728:913](∅→∅)
  − }

  − }

  −

  − #[cfg(feature = "mmap")]

  − fn fallocate(&self, length: u64) -> Result<(), Error> {

  − if let Some(ref file) = self.file {

  − file.allocate(length)?
• edit in sanakirja/src/environment/mod.rs at line 341
  [3.103982]→[2.914:1045](∅→∅)
  − Ok(())

  − }

  −

  − #[cfg(not(feature = "mmap"))]

  − fn fallocate(&self, length: u64) -> Result<(), Error> {

  − Ok(())
• edit in sanakirja/src/environment/mod.rs at line 349
  [3.104118]→[2.1125:1173](∅→∅)
  − self.fallocate(offset + PAGE_SIZEU64)?;
• replacement in sanakirja/src/environment/mod.rs at line 353
  [3.20369]→[3.104214:104279](∅→∅),[3.104214]→[3.104214:104279](∅→∅)
  − mmaps.push(self.open_mmap(i, length0).unwrap());
  [3.20369]

  [3.104279]
  + mmaps.push(self.open_mmap(i, length0)?);
• edit in sanakirja/src/environment/mod.rs at line 391
  [3.105581]

  [12.5678]
  + }

  +

  + #[cfg(feature = "mmap")]

  + fn fallocate(file: &std::fs::File, length: u64) -> Result<(), Error> {

  + file.allocate(length)?;

  + Ok(())
• edit in sanakirja/src/environment/mod.rs at line 399
  [12.5681]

  [12.5681]
  + #[cfg(not(feature = "mmap"))]

  + fn fallocate(&self, length: u64) -> Result<(), Error> {

  + Ok(())

  + }

  +
• replacement in sanakirja/Cargo.toml at line 3
  [3.108441]→[2.1298:1316](∅→∅)
  − version = "1.1.6"
  [3.108441]

  [3.108459]
  + version = "1.1.7"