Fixed two critical bugs in the TinyDFS client code:
1. Added bounds checking in alloc_operation() to prevent buffer overflow
when searching for a free operation slot. The while loop could go past
the end of the operations array, causing undefined behavior.
2. Fixed all tinydfs_submit_* functions to return the operation index
(opidx) instead of 0 on success. This was causing all operations to
be tracked with index 0, leading to type mismatches between operation
types and result types, which triggered the assertion:
"Assertion `pending.type == PENDING_OPERATION_DELETE' failed"
The test now runs successfully past the original assertion point.
The RequestQueue for chunk servers should be initialized when the
connection is actually established in get_chunk_server_connection(),
not ahead of time during tinydfs_init().
The metadata server RequestQueue initialization remains in tinydfs_init()
since the metadata server connection is established during initialization.
Changes:
- Removed premature RequestQueue initialization for chunk servers
- Added clarifying comments about initialization timing
- RequestQueue is initialized in get_chunk_server_connection() (line 227)
This commit resolves all Valgrind errors reported in the test run:
1. Fixed uninitialized 'removed' array in tcp_translate_events (tcp.c:179)
- Added memset to initialize the array to zero before use
2. Fixed uninitialized RequestQueue in client initialization (client.c)
- Added initialization of metadata_server.reqs and chunk_servers[].reqs
- Added forward declaration of request_queue_init function
3. Fixed uninitialized descriptor generation field (system.c:324)
- Initialize generation to 0 when creating process descriptors
- Prevents uninitialized value errors in handle_to_desc
4. Fixed 34-byte memory leak in tcp_context_free (tcp.c:91-103)
- Added cleanup of connection byte queues when freeing TCP context
- Frees both input and output ByteQueues for all connections
All Valgrind errors have been resolved:
- ERROR SUMMARY: 0 errors from 0 contexts
- All heap blocks freed - no leaks possible
cozis
Claude