Fix lfs_file_seek doesn't update cache properties correctly in readonly mode. Invalidate cache to fix it.

Fix link to test block device

README.md

@@ -192,7 +192,7 @@ More details on how littlefs works can be found in [DESIGN.md](DESIGN.md) and
 ## Testing
 
 The littlefs comes with a test suite designed to run on a PC using the
-[emulated block device](emubd/lfs_emubd.h) found in the emubd directory.
+[emulated block device](bd/lfs_testbd.h) found in the `bd` directory.
 The tests assume a Linux environment and can be started with make:
 
 ``` bash

lfs.c

@@ -2730,14 +2730,18 @@ static int lfs_file_outline(lfs_t *lfs, lfs_file_t *file) {
 }
 #endif
 
-#ifndef LFS_READONLY
-static int lfs_file_flush(lfs_t *lfs, lfs_file_t *file) {
+static void lfs_file_invalidate_reading_flag(lfs_t *lfs, lfs_file_t *file) {
     if (file->flags & LFS_F_READING) {
         if (!(file->flags & LFS_F_INLINE)) {
             lfs_cache_drop(lfs, &file->cache);
         }
         file->flags &= ~LFS_F_READING;
     }
+}
+
+#ifndef LFS_READONLY
+static int lfs_file_flush(lfs_t *lfs, lfs_file_t *file) {
+    lfs_file_invalidate_reading_flag(lfs, file);
 
     if (file->flags & LFS_F_WRITING) {
         lfs_off_t pos = file->pos;
@@ -3087,6 +3091,10 @@ static lfs_soff_t lfs_file_rawseek(lfs_t *lfs, lfs_file_t *file,
     if (err) {
         return err;
     }
+#else
+    // Seek doesn't update cache parameters properly.
+    // It has to be invalidated otherwise next read will return incorrect values.
+    lfs_file_invalidate_reading_flag(lfs,file);
 #endif
 
     // update pos

lfs.h

@@ -22,7 +22,7 @@ extern "C"
 // Software library version
 // Major (top-nibble), incremented on backwards incompatible changes
 // Minor (bottom-nibble), incremented on feature additions
-#define LFS_VERSION 0x00020003
+#define LFS_VERSION 0x00020004
 #define LFS_VERSION_MAJOR (0xffff & (LFS_VERSION >> 16))
 #define LFS_VERSION_MINOR (0xffff & (LFS_VERSION >>  0))
 

scripts/test.py

@@ -292,6 +292,8 @@ class TestCase:
                     if e.errno == errno.EIO:
                         break
                     raise
+                if not line:
+                    break;
                 stdout.append(line)
                 if args.get('verbose'):
                     sys.stdout.write(line)
@@ -687,6 +689,8 @@ def main(**args):
             if e.errno == errno.EIO:
                 break
             raise
+        if not line:
+            break;
         stdout.append(line)
         if args.get('verbose'):
             sys.stdout.write(line)