storage: a series fixups for stargz chunks

Signed-off-by: Yan Song <yansong.ys@antfin.com>

Author: imeoer

rafs/src/metadata/layout/v6.rs

@@ -17,6 +17,7 @@ use lazy_static::lazy_static;
 use nydus_utils::{compress, digest, round_up, ByteSize};
 use storage::device::{BlobFeatures, BlobInfo};
 use storage::meta::{BlobMetaHeaderOndisk, BLOB_FEATURE_4K_ALIGNED};
+use storage::RAFS_MAX_CHUNK_SIZE;
 
 use crate::metadata::{layout::RafsXAttrs, RafsStore, RafsSuperFlags};
 use crate::{impl_bootstrap_converter, impl_pub_getter_setter, RafsIoReader, RafsIoWrite};
@@ -352,7 +353,10 @@ impl RafsV6SuperBlockExt {
         }
 
         let chunk_size = u32::from_le(self.s_chunk_size) as u64;
-        if !chunk_size.is_power_of_two() || chunk_size < EROFS_BLOCK_SIZE {
+        if !chunk_size.is_power_of_two()
+            || chunk_size < EROFS_BLOCK_SIZE
+            || chunk_size > RAFS_MAX_CHUNK_SIZE
+        {
             return Err(einval!("invalid chunk size in Rafs v6 extended superblock"));
         }
 
@@ -1292,7 +1296,11 @@ impl RafsV6Blob {
         }
 
         let c_size = u32::from_le(self.chunk_size) as u64;
-        if c_size.count_ones() != 1 || c_size < EROFS_BLOCK_SIZE || c_size != chunk_size as u64 {
+        if c_size.count_ones() != 1
+            || c_size < EROFS_BLOCK_SIZE
+            || c_size > RAFS_MAX_CHUNK_SIZE
+            || c_size != chunk_size as u64
+        {
             error!(
                 "RafsV6Blob: idx {} invalid c_size {}, count_ones() {}",
                 blob_index,

src/bin/nydusd/fs_cache.rs

@@ -584,7 +584,16 @@ impl FsCacheHandler {
                     }
                     Some(obj) => match obj.fetch_range_uncompressed(msg.off, msg.len) {
                         Ok(v) if v == msg.len as usize => {}
-                        _ => debug!("fscache: failed to read data from blob object"),
+                        Ok(v) => {
+                            warn!(
+                                "fscache: read data from blob object not matched: {} != {}",
+                                v, msg.len
+                            );
+                        }
+                        Err(e) => error!(
+                            "{}",
+                            format!("fscache: failed to read data from blob object: {}", e,)
+                        ),
                     },
                 }
             }

storage/src/cache/cachedfile.rs

@@ -359,6 +359,22 @@ impl BlobObject for FileCacheEntry {
 
 impl FileCacheEntry {
     fn do_fetch_chunks(&self, chunks: &[BlobIoChunk]) -> Result<usize> {
+        if self.is_stargz() {
+            for chunk in chunks {
+                let mut buf = alloc_buf(chunk.uncompress_size() as usize);
+                self.read_raw_chunk(chunk, &mut buf, false, None)?;
+                if self.dio_enabled {
+                    self.adjust_buffer_for_dio(&mut buf)
+                }
+                Self::persist_chunk(&self.file, chunk.uncompress_offset(), &buf)
+                    .map_err(|e| eio!(format!("do_fetch_chunk failed to persist data, {:?}", e)))?;
+                self.chunk_map
+                    .set_ready_and_clear_pending(chunk.as_base())
+                    .unwrap_or_else(|e| error!("set ready failed, {}", e));
+            }
+            return Ok(0);
+        }
+
         debug_assert!(!chunks.is_empty());
         let bitmap = self
             .chunk_map

storage/src/cache/fscache/mod.rs

@@ -166,9 +166,6 @@ impl FileCacheEntry {
         if blob_info.has_feature(BlobFeatures::V5_NO_EXT_BLOB_TABLE) {
             return Err(einval!("fscache does not support Rafs v5 blobs"));
         }
-        if blob_info.is_stargz() {
-            return Err(einval!("fscache does not support stargz blob file"));
-        }
         let file = blob_info
             .get_fscache_file()
             .ok_or_else(|| einval!("No fscache file associated with the blob_info"))?;
@@ -211,7 +208,7 @@ impl FileCacheEntry {
             is_get_blob_object_supported: true,
             is_compressed: false,
             is_direct_chunkmap: true,
-            is_stargz: false,
+            is_stargz: blob_info.is_stargz(),
             dio_enabled: true,
             need_validate: mgr.validate,
             prefetch_config,

storage/src/lib.rs

@@ -72,8 +72,8 @@ macro_rules! impl_getter {
 
 /// Default blob chunk size.
 pub const RAFS_DEFAULT_CHUNK_SIZE: u64 = 1024 * 1024;
-/// Maximum blob chunk size.
-pub const RAFS_MAX_CHUNK_SIZE: u64 = 1024 * 1024;
+/// Maximum blob chunk size, 16MB.
+pub const RAFS_MAX_CHUNK_SIZE: u64 = 1024 * 1024 * 16;
 
 /// Error codes related to storage subsystem.
 #[derive(Debug)]

storage/src/meta/mod.rs

@@ -412,6 +412,7 @@ impl BlobMetaInfo {
             chunks: chunk_infos,
             base: base as *const u8,
             unmap_len: expected_size,
+            is_stargz: blob_info.is_stargz(),
         });
 
         Ok(BlobMetaInfo { state })
@@ -470,7 +471,9 @@ impl BlobMetaInfo {
                 index += 1;
                 let entry = &infos[index];
                 self.validate_chunk(entry)?;
-                if entry.uncompressed_offset() != last_end {
+
+                // For stargz chunks, disable this check.
+                if !self.state.is_stargz && entry.uncompressed_offset() != last_end {
                     return Err(einval!(format!(
                         "mismatch uncompressed {} size {} last_end {}",
                         entry.uncompressed_offset(),
@@ -567,7 +570,8 @@ impl BlobMetaInfo {
 
     #[inline]
     fn validate_chunk(&self, entry: &BlobChunkInfoOndisk) -> Result<()> {
-        if entry.compressed_end() > self.state.compressed_size
+        // For stargz blob, self.state.compressed_size == 0, so don't validate it.
+        if (!self.state.is_stargz && entry.compressed_end() > self.state.compressed_size)
             || entry.uncompressed_end() > self.state.uncompressed_size
         {
             Err(einval!())
@@ -651,6 +655,8 @@ pub struct BlobMetaState {
     chunks: ManuallyDrop<Vec<BlobChunkInfoOndisk>>,
     base: *const u8,
     unmap_len: usize,
+    /// The blob meta is for an stargz image.
+    is_stargz: bool,
 }
 
 // // Safe to Send/Sync because the underlying data structures are readonly
@@ -676,6 +682,25 @@ impl BlobMetaState {
         let mut start = 0;
         let mut end = 0;
 
+        if self.is_stargz {
+            // FIXME: since stargz chunks are not currently allocated chunk index in the order of uncompressed_offset,
+            // a binary search is not available for now, here is a heavy overhead workaround, need to be fixed.
+            for i in 0..self.chunk_count {
+                let off = if compressed {
+                    chunks[i as usize].compressed_offset()
+                } else {
+                    chunks[i as usize].uncompressed_offset()
+                };
+                if addr == off {
+                    return Ok(i as usize);
+                }
+            }
+            return Err(einval!(format!(
+                "can't find stargz chunk by offset {}",
+                addr,
+            )));
+        }
+
         while left < right {
             let mid = left + size / 2;
             // SAFETY: the call is made safe by the following invariants:
@@ -804,6 +829,7 @@ mod tests {
             ]),
             base: std::ptr::null(),
             unmap_len: 0,
+            is_stargz: false,
         };
 
         assert_eq!(state.get_chunk_index_nocheck(0, false).unwrap(), 0);
@@ -888,6 +914,7 @@ mod tests {
             ]),
             base: std::ptr::null(),
             unmap_len: 0,
+            is_stargz: false,
         };
         let info = BlobMetaInfo {
             state: Arc::new(state),