Ansariel kindly offered their patch to help mitigate this round of file system issues - taken from https://vcs.firestormviewer.org/phoenix-firestorm/changeset/104a8600946be01e2de44d10ad069ba854272d1f

3 files changed, 58 insertions, 7 deletions

diff --git a/indra/llfilesystem/lldiskcache.cpp b/indra/llfilesystem/lldiskcache.cpp
index c9f7684b5a..61eb654693 100644
--- a/indra/llfilesystem/lldiskcache.cpp
+++ b/indra/llfilesystem/lldiskcache.cpp
@@ -192,8 +192,8 @@ const std::string LLDiskCache::metaDataToFilepath(const std::string id,
     file_path << id;
     file_path << "_";
     file_path << (extra_info.empty() ? "0" : extra_info);
-    //file_path << "_";
-    //file_path << assetTypeToString(at); // see  SL-14210 Prune descriptive tag from new cache filenames
+    file_path << "_";
+    file_path << assetTypeToString(at); // see  SL-14210 Prune descriptive tag from new cache filenames
                                           // for details of why it was removed. Note that if you put it
                                           // back or change the format of the filename, the cache files
                                           // files will be invalidated (and perhaps, more importantly,
diff --git a/indra/llfilesystem/llfilesystem.cpp b/indra/llfilesystem/llfilesystem.cpp
index 053b52014e..da44e8d98c 100644
--- a/indra/llfilesystem/llfilesystem.cpp
+++ b/indra/llfilesystem/llfilesystem.cpp
@@ -200,9 +200,36 @@ BOOL LLFileSystem::write(const U8* buffer, S32 bytes)
         {
             ofs.write((const char*)buffer, bytes);
 
+            mPosition = ofs.tellp(); // <FS:Ansariel> Fix asset caching
+
+            success = TRUE;
+        }
+    }
+    // <FS:Ansariel> Fix asset caching
+    else if (mMode == READ_WRITE)
+    {
+        // Don't truncate if file already exists
+        llofstream ofs(filename, std::ios::in | std::ios::binary);
+        if (ofs)
+        {
+            ofs.seekp(mPosition, std::ios::beg);
+            ofs.write((const char*)buffer, bytes);
+            mPosition += bytes;
             success = TRUE;
         }
+        else
+        {
+            // File doesn't exist - open in write mode
+            ofs.open(filename, std::ios::binary);
+            if (ofs.is_open())
+            {
+                ofs.write((const char*)buffer, bytes);
+                mPosition += bytes;
+                success = TRUE;
+            }
+        }
     }
+    // </FS:Ansariel>
     else
     {
         llofstream ofs(filename, std::ios::binary);
diff --git a/indra/newview/llmeshrepository.cpp b/indra/newview/llmeshrepository.cpp
index 8e5bdc0225..c2404a7e67 100644
--- a/indra/newview/llmeshrepository.cpp
+++ b/indra/newview/llmeshrepository.cpp
@@ -3248,13 +3248,29 @@ void LLMeshHeaderHandler::processData(LLCore::BufferArray * /* body */, S32 /* b
 			// only allocate as much space in the cache as is needed for the local cache
 			data_size = llmin(data_size, bytes);
 
-			LLFileSystem file(mesh_id, LLAssetType::AT_MESH, LLFileSystem::WRITE);
+			// <FS:Ansariel> Fix asset caching
+			//LLFileSystem file(mesh_id, LLAssetType::AT_MESH, LLFileSystem::WRITE);
+			LLFileSystem file(mesh_id, LLAssetType::AT_MESH, LLFileSystem::READ_WRITE);
 			if (file.getMaxSize() >= bytes)
 			{
 				LLMeshRepository::sCacheBytesWritten += data_size;
 				++LLMeshRepository::sCacheWrites;
 
 				file.write(data, data_size);
+
+				// <FS:Ansariel> Fix asset caching
+				S32 remaining = bytes - file.tell();
+				if (remaining > 0)
+				{
+					U8* block = new(std::nothrow) U8[remaining];
+					if (block)
+					{
+						memset(block, 0, remaining);
+						file.write(block, remaining);
+						delete[] block;
+					}
+				}
+				// </FS:Ansariel>
 			}
 		}
 		else
@@ -3307,7 +3323,9 @@ void LLMeshLODHandler::processData(LLCore::BufferArray * /* body */, S32 /* body
 		if (result == MESH_OK)
 		{
 			// good fetch from sim, write to cache
-			LLFileSystem file(mMeshParams.getSculptID(), LLAssetType::AT_MESH, LLFileSystem::WRITE);
+			// <FS:Ansariel> Fix asset caching
+			//LLFileSystem file(mMeshParams.getSculptID(), LLAssetType::AT_MESH, LLFileSystem::WRITE);
+			LLFileSystem file(mMeshParams.getSculptID(), LLAssetType::AT_MESH, LLFileSystem::READ_WRITE);
 
 			S32 offset = mOffset;
 			S32 size = mRequestedBytes;
@@ -3371,7 +3389,9 @@ void LLMeshSkinInfoHandler::processData(LLCore::BufferArray * /* body */, S32 /*
 		&& gMeshRepo.mThread->skinInfoReceived(mMeshID, data, data_size))
 	{
 		// good fetch from sim, write to cache
-		LLFileSystem file(mMeshID, LLAssetType::AT_MESH, LLFileSystem::WRITE);
+		// <FS:Ansariel> Fix asset caching
+		//LLFileSystem file(mMeshID, LLAssetType::AT_MESH, LLFileSystem::WRITE);
+		LLFileSystem file(mMeshID, LLAssetType::AT_MESH, LLFileSystem::READ_WRITE);
 
 		S32 offset = mOffset;
 		S32 size = mRequestedBytes;
@@ -3419,7 +3439,9 @@ void LLMeshDecompositionHandler::processData(LLCore::BufferArray * /* body */, S
 		&& gMeshRepo.mThread->decompositionReceived(mMeshID, data, data_size))
 	{
 		// good fetch from sim, write to cache
-		LLFileSystem file(mMeshID, LLAssetType::AT_MESH, LLFileSystem::WRITE);
+		// <FS:Ansariel> Fix asset caching
+		//LLFileSystem file(mMeshID, LLAssetType::AT_MESH, LLFileSystem::WRITE);
+		LLFileSystem file(mMeshID, LLAssetType::AT_MESH, LLFileSystem::READ_WRITE);
 
 		S32 offset = mOffset;
 		S32 size = mRequestedBytes;
@@ -3466,7 +3488,9 @@ void LLMeshPhysicsShapeHandler::processData(LLCore::BufferArray * /* body */, S3
 		&& gMeshRepo.mThread->physicsShapeReceived(mMeshID, data, data_size) == MESH_OK)
 	{
 		// good fetch from sim, write to cache for caching
-		LLFileSystem file(mMeshID, LLAssetType::AT_MESH, LLFileSystem::WRITE);
+		// <FS:Ansariel> Fix asset caching
+		//LLFileSystem file(mMeshID, LLAssetType::AT_MESH, LLFileSystem::WRITE);
+		LLFileSystem file(mMeshID, LLAssetType::AT_MESH, LLFileSystem::READ_WRITE);
 
 		S32 offset = mOffset;
 		S32 size = mRequestedBytes;