RawFileV2 implementation

Author: mkeeter

Cargo.lock

@@ -109,6 +109,7 @@ tracing-subscriber = "0.3.18"
 twox-hash = "1.6.3"
 usdt = "0.5.0"
 uuid = { version = "1", features = [ "serde", "v4" ] }
+zerocopy = "0.7.32"
 
 # git
 dropshot = { git = "https://github.com/oxidecomputer/dropshot", branch = "main", features = [ "usdt-probes" ] }

Cargo.toml

@@ -54,6 +54,7 @@ tracing-subscriber.workspace = true
 tracing.workspace = true
 usdt.workspace = true
 uuid.workspace = true
+zerocopy.workspace = true
 crucible-workspace-hack.workspace = true
 
 [dev-dependencies]

downstairs/Cargo.toml

@@ -158,6 +158,7 @@ pub const EXTENT_META_SQLITE: u32 = 1;
 ///
 /// See [`extent_inner_raw::RawInner`] for the implementation.
 pub const EXTENT_META_RAW: u32 = 2;
+pub const EXTENT_META_RAW_V2: u32 = 3;
 
 impl ExtentMeta {
     pub fn new(ext_version: u32) -> ExtentMeta {
@@ -376,7 +377,7 @@ impl Extent {
         //  haven't gotten to deleting the `.db` file).
         let mut has_sqlite = path.with_extension("db").exists();
         let force_sqlite_backend = match backend {
-            Backend::RawFile => false,
+            Backend::RawFile | Backend::RawFileV2 => false,
             #[cfg(any(test, feature = "integration-tests"))]
             Backend::SQLite => true,
         };
@@ -460,6 +461,11 @@ impl Extent {
                             dir, def, number, read_only, log,
                         )?)
                     }
+                    EXTENT_META_RAW_V2 => {
+                        Box::new(extent_inner_raw_v2::RawInnerV2::open(
+                            dir, def, number, read_only, log,
+                        )?)
+                    }
                     i => {
                         return Err(CrucibleError::IoError(format!(
                             "raw extent {number} has unknown tag {i}"
@@ -528,6 +534,9 @@ impl Extent {
             Backend::RawFile => {
                 Box::new(extent_inner_raw::RawInner::create(dir, def, number)?)
             }
+            Backend::RawFileV2 => Box::new(
+                extent_inner_raw_v2::RawInnerV2::create(dir, def, number)?,
+            ),
             #[cfg(any(test, feature = "integration-tests"))]
             Backend::SQLite => Box::new(
                 extent_inner_sqlite::SqliteInner::create(dir, def, number)?,