diff --git a/blobfs/src/lib.rs b/blobfs/src/lib.rs
index 9fe380ca17f..8b7d3db0fe5 100644
--- a/blobfs/src/lib.rs
+++ b/blobfs/src/lib.rs
@@ -27,8 +27,6 @@ use rafs::{
 use serde::Deserialize;
 use std::any::Any;
 #[cfg(feature = "virtiofs")]
-use std::convert::TryInto;
-#[cfg(feature = "virtiofs")]
 use std::ffi::CStr;
 use std::ffi::CString;
 #[cfg(feature = "virtiofs")]
@@ -165,8 +163,6 @@ impl BootstrapArgs {
 /// combination of mount namespaces and the pivot_root system call.
 pub struct BlobFs {
     pfs: PassthroughFs,
-    #[cfg(feature = "virtiofs")]
-    cfg: Config,
     #[allow(dead_code)]
     bootstrap_args: BootstrapArgs,
 }
@@ -176,14 +172,10 @@ impl BlobFs {
     pub fn new(cfg: Config) -> io::Result<BlobFs> {
         trace!("BlobFs config is: {:?}", cfg);
 
-        #[cfg(feature = "virtiofs")]
-        let cfg_bak = cfg.clone();
         let bootstrap_args = Self::load_bootstrap(&cfg)?;
         let pfs = PassthroughFs::new(cfg.ps_config)?;
         Ok(BlobFs {
             pfs,
-            #[cfg(feature = "virtiofs")]
-            cfg: cfg_bak,
             bootstrap_args,
         })
     }
diff --git a/blobfs/src/sync_io.rs b/blobfs/src/sync_io.rs
index 4956fcd8a7e..40146ee2a4e 100644
--- a/blobfs/src/sync_io.rs
+++ b/blobfs/src/sync_io.rs
@@ -24,7 +24,18 @@ use storage::device::BlobPrefetchRequest;
 
 impl BlobFs {
     #[cfg(feature = "virtiofs")]
-    fn get_blob_id_and_size(&self, inode: Inode) -> io::Result<(String, i64)> {
+    fn check_st_size(blob_id: &Path, size: i64) -> io::Result<()> {
+        if size < 0 {
+            return Err(einval!(format!(
+                "load_chunks_on_demand: blob_id {:?}, size: {:?} is less than 0",
+                blob_id, size
+            )));
+        }
+        Ok(())
+    }
+
+    #[cfg(feature = "virtiofs")]
+    fn get_blob_id_and_size(&self, inode: Inode) -> io::Result<(String, u64)> {
         // locate blob file that the inode refers to
         let blob_id_full_path = self.pfs.readlinkat_proc_file(inode)?;
         let parent = blob_id_full_path
@@ -37,12 +48,6 @@ impl BlobFs {
             blob_id_full_path
         );
 
-        debug_assert!(
-            parent
-                == Path::new(self.cfg.ps_config.root_dir.as_str())
-                    .join(self.bootstrap_args.blob_cache_dir.as_str())
-        );
-
         let blob_file = Self::open_file(
             libc::AT_FDCWD,
             &blob_id_full_path.as_path(),
@@ -60,31 +65,32 @@ impl BlobFs {
 
         trace!("load_chunks_on_demand: blob_id {:?}", blob_id);
 
-        Ok((blob_id.to_os_string().into_string().unwrap(), st.st_size))
+        Self::check_st_size(blob_id_full_path.as_path(), st.st_size)?;
+
+        Ok((
+            blob_id.to_os_string().into_string().unwrap(),
+            st.st_size as u64,
+        ))
     }
 
     #[cfg(feature = "virtiofs")]
-    fn load_chunks_on_demand(&self, inode: Inode, foffset: u64) -> io::Result<()> {
+    fn load_chunks_on_demand(&self, inode: Inode, offset: u64) -> io::Result<()> {
         // prepare BlobPrefetchRequest and call device.prefetch().
         // Make sure prefetch doesn't use delay_persist as we need the
         // data immediately.
         let (blob_id, size) = self.get_blob_id_and_size(inode)?;
-        let offset: u32 = foffset.try_into().map_err(|_| {
-            einval!(format!(
-                "blobfs: load_chunks_on_demand: foffset {} is larger than u32::MAX",
-                foffset
-            ))
-        })?;
-        let len = (size - offset as i64).try_into().map_err(|_| {
-            einval!(format!(
-                "blobfs: load_chunks_on_demand: len {} is larger than u32::MAX",
-                (size - offset as i64)
-            ))
-        })?;
+        if size <= offset {
+            return Err(einval!(format!(
+                "load_chunks_on_demand: blob_id {:?}, offset {:?} is larger than size {:?}",
+                blob_id, offset, size
+            )));
+        }
+
+        let len = size - offset;
         let req = BlobPrefetchRequest {
             blob_id,
             offset,
-            len: min(len, 0x0020_0000_u32), // 2M range
+            len: min(len, 0x0020_0000_u64), // 2M range
         };
 
         self.bootstrap_args.fetch_range_sync(&[req]).map_err(|e| {
diff --git a/rafs/src/fs.rs b/rafs/src/fs.rs
index cfeb27f9c46..a4242ecb23c 100644
--- a/rafs/src/fs.rs
+++ b/rafs/src/fs.rs
@@ -491,8 +491,8 @@ impl Rafs {
             .iter()
             .map(|b| BlobPrefetchRequest {
                 blob_id: b.blob_id().to_owned(),
-                offset: b.readahead_offset() as u32,
-                len: b.readahead_size() as u32,
+                offset: b.readahead_offset(),
+                len: b.readahead_size(),
             })
             .collect::<Vec<BlobPrefetchRequest>>();
         device.prefetch(&[], &prefetches).unwrap_or_else(|e| {
diff --git a/storage/src/backend/localfs.rs b/storage/src/backend/localfs.rs
index ff4b3aec371..1c688aa4698 100644
--- a/storage/src/backend/localfs.rs
+++ b/storage/src/backend/localfs.rs
@@ -124,7 +124,7 @@ impl BlobReader for LocalFsEntry {
             .map_err(|e| LocalFsError::ReadVecBlob(e).into())
     }
 
-    fn prefetch_blob_data_range(&self, ra_offset: u32, ra_size: u32) -> BackendResult<()> {
+    fn prefetch_blob_data_range(&self, ra_offset: u64, ra_size: u64) -> BackendResult<()> {
         if !self.readahead {
             return Ok(());
         }
@@ -153,13 +153,13 @@ impl BlobReader for LocalFsEntry {
         }
 
         // Prefetch data according to the hint if it's valid.
-        let end = ra_offset as u64 + ra_size as u64;
+        let end = ra_offset + ra_size;
         if ra_size != 0 && end <= blob_size {
             info!(
                 "kick off hinted blob readahead offset {} len {}",
                 ra_offset, ra_size
             );
-            readahead(self.file.as_raw_fd(), ra_offset as u64, end);
+            readahead(self.file.as_raw_fd(), ra_offset, end);
         }
 
         // start access logging
diff --git a/storage/src/backend/mod.rs b/storage/src/backend/mod.rs
index 8a42bde757c..60fe0cb07be 100644
--- a/storage/src/backend/mod.rs
+++ b/storage/src/backend/mod.rs
@@ -180,7 +180,7 @@ pub trait BlobReader: Send + Sync {
     /// This method only prefetch blob data from storage backends, it doesn't cache data in the
     /// blob cache subsystem. So it's useful for disk and file system based storage backends, but
     /// it may not help for Registry/OSS based storage backends.
-    fn prefetch_blob_data_range(&self, ra_offset: u32, ra_size: u32) -> BackendResult<()>;
+    fn prefetch_blob_data_range(&self, ra_offset: u64, ra_size: u64) -> BackendResult<()>;
 
     /// Stop the background data prefetching tasks.
     fn stop_data_prefetch(&self) -> BackendResult<()>;
diff --git a/storage/src/backend/oss.rs b/storage/src/backend/oss.rs
index ecb0befcaae..bf31245097d 100644
--- a/storage/src/backend/oss.rs
+++ b/storage/src/backend/oss.rs
@@ -202,7 +202,7 @@ impl BlobReader for OssReader {
             .map(|size| size as usize)?)
     }
 
-    fn prefetch_blob_data_range(&self, _ra_offset: u32, _ra_size: u32) -> BackendResult<()> {
+    fn prefetch_blob_data_range(&self, _ra_offset: u64, _ra_size: u64) -> BackendResult<()> {
         Err(BackendError::Unsupported(
             "Oss backend does not support prefetch as per on-disk blob entries".to_string(),
         ))
diff --git a/storage/src/backend/registry.rs b/storage/src/backend/registry.rs
index 3ffaa5d1957..dfe3b96f315 100644
--- a/storage/src/backend/registry.rs
+++ b/storage/src/backend/registry.rs
@@ -534,7 +534,7 @@ impl BlobReader for RegistryReader {
             .map_err(BackendError::Registry)
     }
 
-    fn prefetch_blob_data_range(&self, _ra_offset: u32, _ra_size: u32) -> BackendResult<()> {
+    fn prefetch_blob_data_range(&self, _ra_offset: u64, _ra_size: u64) -> BackendResult<()> {
         Err(BackendError::Unsupported(
             "Registry backend does not support prefetch as per on-disk blob entries".to_string(),
         ))
diff --git a/storage/src/cache/worker.rs b/storage/src/cache/worker.rs
index 6c10d1ec8a1..25931db3490 100644
--- a/storage/src/cache/worker.rs
+++ b/storage/src/cache/worker.rs
@@ -304,11 +304,8 @@ impl AsyncWorkerMgr {
                     e
                 );
             }
-        } else if offset < u32::MAX as u64 && size < u32::MAX as u64 {
-            let _ = cache.reader().prefetch_blob_data_range(
-                offset as u32,
-                std::cmp::min(size as u32, u32::MAX - offset as u32),
-            );
+        } else {
+            let _ = cache.reader().prefetch_blob_data_range(offset, size);
         }
 
         Ok(())
diff --git a/storage/src/device.rs b/storage/src/device.rs
index 344d8c2ff17..788beb2aeee 100644
--- a/storage/src/device.rs
+++ b/storage/src/device.rs
@@ -766,9 +766,9 @@ pub struct BlobPrefetchRequest {
     /// The ID of the blob to prefetch data for.
     pub blob_id: String,
     /// Offset into the blob to prefetch data.
-    pub offset: u32,
+    pub offset: u64,
     /// Size of data to prefetch.
-    pub len: u32,
+    pub len: u64,
 }
 
 /// Trait to provide direct access to underlying uncompressed blob file.
diff --git a/storage/src/meta/mod.rs b/storage/src/meta/mod.rs
index e1e291df862..e9e1018c1d7 100644
--- a/storage/src/meta/mod.rs
+++ b/storage/src/meta/mod.rs
@@ -618,6 +618,8 @@ impl BlobMetaState {
         let mut size = self.chunk_count as usize;
         let mut left = 0;
         let mut right = size;
+        let mut start = 0;
+        let mut end = 0;
 
         while left < right {
             let mid = left + size / 2;
@@ -625,10 +627,12 @@ impl BlobMetaState {
             // - `mid >= 0`
             // - `mid < size`: `mid` is limited by `[left; right)` bound.
             let entry = unsafe { chunks.get_unchecked(mid) };
-            let (start, end) = if compressed {
-                (entry.compressed_offset(), entry.compressed_end())
+            if compressed {
+                start = entry.compressed_offset();
+                end = entry.compressed_end();
             } else {
-                (entry.uncompressed_offset(), entry.uncompressed_end())
+                start = entry.uncompressed_offset();
+                end = entry.uncompressed_end();
             };
 
             if start > addr {
@@ -642,7 +646,12 @@ impl BlobMetaState {
             size = right - left;
         }
 
-        Err(einval!())
+        // if addr == self.chunks[last].compressed_offset, return einval
+        // with error msg.
+        Err(einval!(format!(
+            "start: {}, end: {}, addr: {}",
+            start, end, addr
+        )))
     }
 }
 
@@ -885,8 +894,8 @@ mod tests {
 
         fn prefetch_blob_data_range(
             &self,
-            _blob_readahead_offset: u32,
-            _blob_readahead_size: u32,
+            _blob_readahead_offset: u64,
+            _blob_readahead_size: u64,
         ) -> BackendResult<()> {
             Ok(())
         }
diff --git a/storage/src/test.rs b/storage/src/test.rs
index 1837951a8bb..ed9bd49b951 100644
--- a/storage/src/test.rs
+++ b/storage/src/test.rs
@@ -34,8 +34,8 @@ impl BlobReader for MockBackend {
 
     fn prefetch_blob_data_range(
         &self,
-        _blob_readahead_offset: u32,
-        _blob_readahead_size: u32,
+        _blob_readahead_offset: u64,
+        _blob_readahead_size: u64,
     ) -> BackendResult<()> {
         Ok(())
     }