lib/littlefs: Update littlefs2 to v2.3.0.

At commit 1a59954ec64ca168828a15242cc6de94ac75f9d1

Signed-off-by: Damien George <damien@micropython.org>

lib/littlefs/README.md

@@ -2,7 +2,7 @@ littlefs library
 ================
 
 The upstream source for the files in this directory is
-https://github.com/ARMmbed/littlefs
+https://github.com/littlefs-project/littlefs
 
 To generate the separate files with lfs1 and lfs2 prefixes run the following
 commands in the top-level directory of the littlefs repository (replace the
@@ -13,7 +13,7 @@ version tags with the latest/desired ones, and set `$MPY_DIR`):
     cp lfs1*.[ch] $MPY_DIR/lib/littlefs
     git reset --hard HEAD
 
-    git checkout v2.1.3
+    git checkout v2.3.0
     python2 ./scripts/prefix.py lfs2
     cp lfs2*.[ch] $MPY_DIR/lib/littlefs
     git reset --hard HEAD

lib/littlefs/lfs2.h

@@ -9,6 +9,7 @@
 
 #include <stdint.h>
 #include <stdbool.h>
+#include "lfs2_util.h"
 
 #ifdef __cplusplus
 extern "C"
@@ -21,7 +22,7 @@ extern "C"
 // Software library version
 // Major (top-nibble), incremented on backwards incompatible changes
 // Minor (bottom-nibble), incremented on feature additions
-#define LFS2_VERSION 0x00020002
+#define LFS2_VERSION 0x00020003
 #define LFS2_VERSION_MAJOR (0xffff & (LFS2_VERSION >> 16))
 #define LFS2_VERSION_MINOR (0xffff & (LFS2_VERSION >>  0))
 
@@ -123,20 +124,25 @@ enum lfs2_type {
 enum lfs2_open_flags {
     // open flags
     LFS2_O_RDONLY = 1,         // Open a file as read only
+#ifndef LFS2_READONLY
     LFS2_O_WRONLY = 2,         // Open a file as write only
     LFS2_O_RDWR   = 3,         // Open a file as read and write
     LFS2_O_CREAT  = 0x0100,    // Create a file if it does not exist
     LFS2_O_EXCL   = 0x0200,    // Fail if a file already exists
     LFS2_O_TRUNC  = 0x0400,    // Truncate the existing file to zero size
     LFS2_O_APPEND = 0x0800,    // Move to end of file on every write
+#endif
 
     // internally used flags
+#ifndef LFS2_READONLY
     LFS2_F_DIRTY   = 0x010000, // File does not match storage
     LFS2_F_WRITING = 0x020000, // File has been written since last flush
+#endif
     LFS2_F_READING = 0x040000, // File has been read since last flush
-    LFS2_F_ERRED   = 0x080000, // An error occured during write
+#ifndef LFS2_READONLY
+    LFS2_F_ERRED   = 0x080000, // An error occurred during write
+#endif
     LFS2_F_INLINE  = 0x100000, // Currently inlined in directory entry
-    LFS2_F_OPENED  = 0x200000, // File has been opened
 };
 
 // File seek flags
@@ -174,6 +180,16 @@ struct lfs2_config {
     // are propogated to the user.
     int (*sync)(const struct lfs2_config *c);
 
+#ifdef LFS2_THREADSAFE
+    // Lock the underlying block device. Negative error codes
+    // are propogated to the user.
+    int (*lock)(const struct lfs2_config *c);
+
+    // Unlock the underlying block device. Negative error codes
+    // are propogated to the user.
+    int (*unlock)(const struct lfs2_config *c);
+#endif
+
     // Minimum size of a block read. All read operations will be a
     // multiple of this value.
     lfs2_size_t read_size;
@@ -399,6 +415,7 @@ typedef struct lfs2 {
 
 /// Filesystem functions ///
 
+#ifndef LFS2_READONLY
 // Format a block device with the littlefs
 //
 // Requires a littlefs object and config struct. This clobbers the littlefs
@@ -407,6 +424,7 @@ typedef struct lfs2 {
 //
 // Returns a negative error code on failure.
 int lfs2_format(lfs2_t *lfs2, const struct lfs2_config *config);
+#endif
 
 // Mounts a littlefs
 //
@@ -426,12 +444,15 @@ int lfs2_unmount(lfs2_t *lfs2);
 
 /// General operations ///
 
+#ifndef LFS2_READONLY
 // Removes a file or directory
 //
 // If removing a directory, the directory must be empty.
 // Returns a negative error code on failure.
 int lfs2_remove(lfs2_t *lfs2, const char *path);
+#endif
 
+#ifndef LFS2_READONLY
 // Rename or move a file or directory
 //
 // If the destination exists, it must match the source in type.
@@ -439,6 +460,7 @@ int lfs2_remove(lfs2_t *lfs2, const char *path);
 //
 // Returns a negative error code on failure.
 int lfs2_rename(lfs2_t *lfs2, const char *oldpath, const char *newpath);
+#endif
 
 // Find info about a file or directory
 //
@@ -461,6 +483,7 @@ int lfs2_stat(lfs2_t *lfs2, const char *path, struct lfs2_info *info);
 lfs2_ssize_t lfs2_getattr(lfs2_t *lfs2, const char *path,
         uint8_t type, void *buffer, lfs2_size_t size);
 
+#ifndef LFS2_READONLY
 // Set custom attributes
 //
 // Custom attributes are uniquely identified by an 8-bit type and limited
@@ -470,13 +493,16 @@ lfs2_ssize_t lfs2_getattr(lfs2_t *lfs2, const char *path,
 // Returns a negative error code on failure.
 int lfs2_setattr(lfs2_t *lfs2, const char *path,
         uint8_t type, const void *buffer, lfs2_size_t size);
+#endif
 
+#ifndef LFS2_READONLY
 // Removes a custom attribute
 //
 // If an attribute is not found, nothing happens.
 //
 // Returns a negative error code on failure.
 int lfs2_removeattr(lfs2_t *lfs2, const char *path, uint8_t type);
+#endif
 
 
 /// File operations ///
@@ -525,6 +551,7 @@ int lfs2_file_sync(lfs2_t *lfs2, lfs2_file_t *file);
 lfs2_ssize_t lfs2_file_read(lfs2_t *lfs2, lfs2_file_t *file,
         void *buffer, lfs2_size_t size);
 
+#ifndef LFS2_READONLY
 // Write data to file
 //
 // Takes a buffer and size indicating the data to write. The file will not
@@ -533,6 +560,7 @@ lfs2_ssize_t lfs2_file_read(lfs2_t *lfs2, lfs2_file_t *file,
 // Returns the number of bytes written, or a negative error code on failure.
 lfs2_ssize_t lfs2_file_write(lfs2_t *lfs2, lfs2_file_t *file,
         const void *buffer, lfs2_size_t size);
+#endif
 
 // Change the position of the file
 //
@@ -541,10 +569,12 @@ lfs2_ssize_t lfs2_file_write(lfs2_t *lfs2, lfs2_file_t *file,
 lfs2_soff_t lfs2_file_seek(lfs2_t *lfs2, lfs2_file_t *file,
         lfs2_soff_t off, int whence);
 
+#ifndef LFS2_READONLY
 // Truncates the size of the file to the specified size
 //
 // Returns a negative error code on failure.
 int lfs2_file_truncate(lfs2_t *lfs2, lfs2_file_t *file, lfs2_off_t size);
+#endif
 
 // Return the position of the file
 //
@@ -567,10 +597,12 @@ lfs2_soff_t lfs2_file_size(lfs2_t *lfs2, lfs2_file_t *file);
 
 /// Directory operations ///
 
+#ifndef LFS2_READONLY
 // Create a directory
 //
 // Returns a negative error code on failure.
 int lfs2_mkdir(lfs2_t *lfs2, const char *path);
+#endif
 
 // Open a directory
 //
@@ -632,6 +664,7 @@ lfs2_ssize_t lfs2_fs_size(lfs2_t *lfs2);
 // Returns a negative error code on failure.
 int lfs2_fs_traverse(lfs2_t *lfs2, int (*cb)(void*, lfs2_block_t), void *data);
 
+#ifndef LFS2_READONLY
 #ifdef LFS2_MIGRATE
 // Attempts to migrate a previous version of littlefs
 //
@@ -646,6 +679,7 @@ int lfs2_fs_traverse(lfs2_t *lfs2, int (*cb)(void*, lfs2_block_t), void *data);
 // Returns a negative error code on failure.
 int lfs2_migrate(lfs2_t *lfs2, const struct lfs2_config *cfg);
 #endif
+#endif
 
 
 #ifdef __cplusplus