diff --git a/.travis.yml b/.travis.yml
index 45aedeab..e3ae24df 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,7 +8,7 @@ install:
 script:
 - make all
 - cd bin/
-- file_name="nodemcu-firmware_v${TRAVIS_TAG}.${TRAVIS_BUILD_NUMBER}.bin"
+- file_name="nodemcu_${TRAVIS_TAG}.bin"
 - srec_cat -output ${file_name} -binary 0x00000.bin -binary -fill 0xff 0x00000 0x10000 0x10000.bin -binary -offset 0x10000
 deploy:
   provider: releases
diff --git a/README.md b/README.md
index 43980e13..89fa0480 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,9 @@ Tencent QQ group: 309957875<br />
 - Build-in file, timer, pwm, i2c, spi, 1-wire, net, mqtt, coap, gpio, wifi, adc, uart and system api.
 - GPIO pin re-mapped, use the index to access gpio, i2c, pwm.
 
+# Downloads
+[releases](https://github.com/nodemcu/nodemcu-firmware/releases)
+
 # To Do List (pull requests are very welcomed)
 - loadable c module
 - fix wifi smart connect
@@ -33,6 +36,13 @@ Tencent QQ group: 309957875<br />
 - cross compiler (done)
 
 # Change log
+2015-03-10<br />
+update to the recent spiffs.<br />
+add file.fsinfo() api, usage: remain, used, total = file.fsinfo().<br />
+add Travis CI. please download the latest firmware from [releases](https://github.com/nodemcu/nodemcu-firmware/releases).<br />
+add math lib, partial api work.<br />
+u8g module, ws2812 module default enabled in dev-branch build.
+
 2015-02-13<br />
 add node.compile() api to compile lua text file into lua bytecode file.<br />
 this will reduce memory usage noticeably when require modules into NodeMCU.<br />
diff --git a/app/include/user_version.h b/app/include/user_version.h
index c1144958..4a7f5f6d 100644
--- a/app/include/user_version.h
+++ b/app/include/user_version.h
@@ -7,6 +7,6 @@
 #define NODE_VERSION_INTERNAL   0U
 
 #define NODE_VERSION	"NodeMCU 0.9.5"
-#define BUILD_DATE	    "build 20150306"
+#define BUILD_DATE	    "build 20150310"
 
 #endif	/* __USER_VERSION_H__ */
diff --git a/app/modules/file.c b/app/modules/file.c
index cf10a3a7..117ea128 100644
--- a/app/modules/file.c
+++ b/app/modules/file.c
@@ -175,6 +175,22 @@ static int file_rename( lua_State* L )
   return 1;
 }
 
+// Lua: fsinfo()
+static int file_fsinfo( lua_State* L )
+{
+  uint32_t total, used;
+  SPIFFS_info(&fs, &total, &used);
+  NODE_DBG("total: %d, used:%d\n", total, used);
+  if(total>0x7FFFFFFF || used>0x7FFFFFFF || used > total)
+  {
+    return luaL_error(L, "file system error");;
+  }
+  lua_pushinteger(L, total-used);
+  lua_pushinteger(L, used);
+  lua_pushinteger(L, total);
+  return 3;
+}
+
 #endif
 
 // g_read()
@@ -308,6 +324,7 @@ const LUA_REG_TYPE file_map[] =
   { LSTRKEY( "flush" ), LFUNCVAL( file_flush ) },
   // { LSTRKEY( "check" ), LFUNCVAL( file_check ) },
   { LSTRKEY( "rename" ), LFUNCVAL( file_rename ) },
+  { LSTRKEY( "fsinfo" ), LFUNCVAL( file_fsinfo ) },
 #endif
   
 #if LUA_OPTIMIZE_MEMORY > 0
diff --git a/app/spiffs/spiffs.c b/app/spiffs/spiffs.c
index df749e09..e96e15a0 100644
--- a/app/spiffs/spiffs.c
+++ b/app/spiffs/spiffs.c
@@ -160,7 +160,7 @@ int myspiffs_error( int fd ){
   return SPIFFS_errno(&fs);
 }
 void myspiffs_clearerr( int fd ){
-  fs.errno = SPIFFS_OK;
+  SPIFFS_clearerr(&fs);
 }
 int myspiffs_rename( const char *old, const char *newname ){
   return SPIFFS_rename(&fs, (char *)old, (char *)newname);
diff --git a/app/spiffs/spiffs.h b/app/spiffs/spiffs.h
index 23228446..c5a2c1d2 100644
--- a/app/spiffs/spiffs.h
+++ b/app/spiffs/spiffs.h
@@ -9,6 +9,10 @@
 
 #ifndef SPIFFS_H_
 #define SPIFFS_H_
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
 #include "c_stdio.h"
 #include "spiffs_config.h"
 
@@ -181,7 +185,7 @@ typedef struct {
   u32_t fd_count;
 
   // last error
-  s32_t errno;
+  s32_t err_code;
 
   // current number of free blocks
   u32_t free_blocks;
@@ -375,9 +379,9 @@ void SPIFFS_close(spiffs *fs, spiffs_file fh);
  * Renames a file
  * @param fs            the file system struct
  * @param old           path of file to rename
- * @param new           new path of file
+ * @param newPath       new path of file
  */
-s32_t SPIFFS_rename(spiffs *fs, char *old, char *new);
+s32_t SPIFFS_rename(spiffs *fs, char *old, char *newPath);
 
 /**
  * Returns last error of last file operation.
@@ -385,6 +389,12 @@ s32_t SPIFFS_rename(spiffs *fs, char *old, char *new);
  */
 s32_t SPIFFS_errno(spiffs *fs);
 
+/**
+ * Clears last error.
+ * @param fs            the file system struct
+ */
+void SPIFFS_clearerr(spiffs *fs);
+
 /**
  * Opens a directory stream corresponding to the given name.
  * The stream is positioned at the first entry in the directory.
@@ -416,6 +426,21 @@ struct spiffs_dirent *SPIFFS_readdir(spiffs_DIR *d, struct spiffs_dirent *e);
  */
 s32_t SPIFFS_check(spiffs *fs);
 
+
+/**
+ * Returns number of total bytes available and number of used bytes.
+ * This is an estimation, and depends on if there a many files with little
+ * data or few files with much data.
+ * NB: If used number of bytes exceeds total bytes, a SPIFFS_check should
+ * run. This indicates a power loss in midst of things. In worst case
+ * (repeated powerlosses in mending or gc) you might have to delete some files.
+ *
+ * @param fs            the file system struct
+ * @param total         total number of bytes in filesystem
+ * @param used          used number of bytes in filesystem
+ */
+s32_t SPIFFS_info(spiffs *fs, u32_t *total, u32_t *used);
+
 /**
  * Check if EOF reached.
  * @param fs            the file system struct
@@ -468,4 +493,8 @@ int myspiffs_check( void );
 int myspiffs_rename( const char *old, const char *newname );
 size_t myspiffs_size( int fd );
 
+#if defined(__cplusplus)
+}
+#endif
+
 #endif /* SPIFFS_H_ */
diff --git a/app/spiffs/spiffs_config.h b/app/spiffs/spiffs_config.h
index 8a8fc4b3..3ed8d03d 100644
--- a/app/spiffs/spiffs_config.h
+++ b/app/spiffs/spiffs_config.h
@@ -30,19 +30,19 @@ typedef uint8_t u8_t;
 
 // Set generic spiffs debug output call.
 #ifndef SPIFFS_DGB
-#define SPIFFS_DBG(...)
+#define SPIFFS_DBG(...) //printf(__VA_ARGS__)
 #endif
 // Set spiffs debug output call for garbage collecting.
 #ifndef SPIFFS_GC_DGB
-#define SPIFFS_GC_DBG(...)
+#define SPIFFS_GC_DBG(...) //printf(__VA_ARGS__)
 #endif
 // Set spiffs debug output call for caching.
 #ifndef SPIFFS_CACHE_DGB
-#define SPIFFS_CACHE_DBG(...)
+#define SPIFFS_CACHE_DBG(...) //printf("CA: " __VA_ARGS__)
 #endif
 // Set spiffs debug output call for system consistency checks.
 #ifndef SPIFFS_CHECK_DGB
-#define SPIFFS_CHECK_DBG(...)
+#define SPIFFS_CHECK_DBG(...) //printf(__VA_ARGS__)
 #endif
 
 // Enable/disable API functions to determine exact number of bytes
@@ -77,7 +77,7 @@ typedef uint8_t u8_t;
 
 // Define maximum number of gc runs to perform to reach desired free pages.
 #ifndef SPIFFS_GC_MAX_RUNS
-#define SPIFFS_GC_MAX_RUNS              3
+#define SPIFFS_GC_MAX_RUNS              5
 #endif
 
 // Enable/disable statistics on gc. Debug/test purpose only.
diff --git a/app/spiffs/spiffs_gc.c b/app/spiffs/spiffs_gc.c
index 4d6c8971..22168802 100644
--- a/app/spiffs/spiffs_gc.c
+++ b/app/spiffs/spiffs_gc.c
@@ -119,13 +119,13 @@ s32_t spiffs_gc_check(
     spiffs *fs,
     u32_t len) {
   s32_t res;
-  u32_t free_pages =
-      (SPIFFS_PAGES_PER_BLOCK(fs) - SPIFFS_OBJ_LOOKUP_PAGES(fs)) * fs->block_count
+  s32_t free_pages =
+      (SPIFFS_PAGES_PER_BLOCK(fs) - SPIFFS_OBJ_LOOKUP_PAGES(fs)) * (fs->block_count-2)
       - fs->stats_p_allocated - fs->stats_p_deleted;
   int tries = 0;
 
   if (fs->free_blocks > 3 &&
-      len < free_pages * SPIFFS_DATA_PAGE_SIZE(fs)) {
+      (s32_t)len < free_pages * (s32_t)SPIFFS_DATA_PAGE_SIZE(fs)) {
     return SPIFFS_OK;
   }
 
@@ -168,16 +168,22 @@ s32_t spiffs_gc_check(
     SPIFFS_CHECK_RES(res);
 
     free_pages =
-          (SPIFFS_PAGES_PER_BLOCK(fs) - SPIFFS_OBJ_LOOKUP_PAGES(fs)) * fs->block_count
+          (SPIFFS_PAGES_PER_BLOCK(fs) - SPIFFS_OBJ_LOOKUP_PAGES(fs)) * (fs->block_count - 2)
           - fs->stats_p_allocated - fs->stats_p_deleted;
 
   } while (++tries < SPIFFS_GC_MAX_RUNS && (fs->free_blocks <= 2 ||
-      len > free_pages*SPIFFS_DATA_PAGE_SIZE(fs)));
-  SPIFFS_GC_DBG("gc_check: finished\n");
+      (s32_t)len > free_pages*(s32_t)SPIFFS_DATA_PAGE_SIZE(fs)));
 
-  //printf("gcing finished %i dirty, blocks %i free, %i pages free, %i tries, res %i\n",
-  //    fs->stats_p_allocated + fs->stats_p_deleted,
-  //    fs->free_blocks, free_pages, tries, res);
+  free_pages =
+        (SPIFFS_PAGES_PER_BLOCK(fs) - SPIFFS_OBJ_LOOKUP_PAGES(fs)) * (fs->block_count - 2)
+        - fs->stats_p_allocated - fs->stats_p_deleted;
+  if ((s32_t)len > free_pages*(s32_t)SPIFFS_DATA_PAGE_SIZE(fs)) {
+    res = SPIFFS_ERR_FULL;
+  }
+
+  SPIFFS_GC_DBG("gc_check: finished, %i dirty, blocks %i free, %i pages free, %i tries, res %i\n",
+      fs->stats_p_allocated + fs->stats_p_deleted,
+      fs->free_blocks, free_pages, tries, res);
 
   return res;
 }
diff --git a/app/spiffs/spiffs_hydrogen.c b/app/spiffs/spiffs_hydrogen.c
index 20e45ecf..11c960b4 100644
--- a/app/spiffs/spiffs_hydrogen.c
+++ b/app/spiffs/spiffs_hydrogen.c
@@ -103,7 +103,11 @@ void SPIFFS_unmount(spiffs *fs) {
 }
 
 s32_t SPIFFS_errno(spiffs *fs) {
-  return fs->errno;
+  return fs->err_code;
+}
+
+void SPIFFS_clearerr(spiffs *fs) {
+  fs->err_code = SPIFFS_OK;
 }
 
 s32_t SPIFFS_creat(spiffs *fs, char *path, spiffs_mode mode) {
@@ -314,8 +318,6 @@ s32_t SPIFFS_write(spiffs *fs, spiffs_file fh, void *buf, u32_t len) {
 #endif
   }
 
-  SPIFFS_DBG("SPIFFS_write %i %04x offs:%i len %i\n", fh, fd->obj_id, offset, len);
-
 #if SPIFFS_CACHE_WR
   if ((fd->flags & SPIFFS_DIRECT) == 0) {
     if (len < (s32_t)SPIFFS_CFG_LOG_PAGE_SZ(fs)) {
@@ -334,6 +336,7 @@ s32_t SPIFFS_write(spiffs *fs, spiffs_file fh, void *buf, u32_t len) {
               spiffs_get_cache_page(fs, spiffs_get_cache(fs), fd->cache_page->ix),
               fd->cache_page->offset, fd->cache_page->size);
           spiffs_cache_fd_release(fs, fd->cache_page);
+          SPIFFS_API_CHECK_RES(fs, res);
         } else {
           // writing within cache
           alloc_cpage = 0;
@@ -580,7 +583,7 @@ static s32_t spiffs_fflush_cache(spiffs *fs, spiffs_file fh) {
           spiffs_get_cache_page(fs, spiffs_get_cache(fs), fd->cache_page->ix),
           fd->cache_page->offset, fd->cache_page->size);
       if (res < SPIFFS_OK) {
-        fs->errno = res;
+        fs->err_code = res;
       }
       spiffs_cache_fd_release(fs, fd->cache_page);
     }
@@ -605,7 +608,7 @@ s32_t SPIFFS_fflush(spiffs *fs, spiffs_file fh) {
 
 void SPIFFS_close(spiffs *fs, spiffs_file fh) {
   if (!SPIFFS_CHECK_MOUNT(fs)) {
-    fs->errno = SPIFFS_ERR_NOT_MOUNTED;
+    fs->err_code = SPIFFS_ERR_NOT_MOUNTED;
     return;
   }
   SPIFFS_LOCK(fs);
@@ -661,7 +664,7 @@ s32_t SPIFFS_rename(spiffs *fs, char *old, char *new) {
 spiffs_DIR *SPIFFS_opendir(spiffs *fs, char *name, spiffs_DIR *d) {
   (void)name;
   if (!SPIFFS_CHECK_MOUNT(fs)) {
-    fs->errno = SPIFFS_ERR_NOT_MOUNTED;
+    fs->err_code = SPIFFS_ERR_NOT_MOUNTED;
     return 0;
   }
   d->fs = fs;
@@ -707,7 +710,7 @@ static s32_t spiffs_read_dir_v(
 
 struct spiffs_dirent *SPIFFS_readdir(spiffs_DIR *d, struct spiffs_dirent *e) {
   if (!SPIFFS_CHECK_MOUNT(d->fs)) {
-    d->fs->errno = SPIFFS_ERR_NOT_MOUNTED;
+    d->fs->err_code = SPIFFS_ERR_NOT_MOUNTED;
     return 0;
   }
   SPIFFS_LOCK(fs);
@@ -732,7 +735,7 @@ struct spiffs_dirent *SPIFFS_readdir(spiffs_DIR *d, struct spiffs_dirent *e) {
     d->entry = entry + 1;
     ret = e;
   } else {
-    d->fs->errno = res;
+    d->fs->err_code = res;
   }
   SPIFFS_UNLOCK(fs);
   return ret;
@@ -760,6 +763,29 @@ s32_t SPIFFS_check(spiffs *fs) {
   return res;
 }
 
+s32_t SPIFFS_info(spiffs *fs, u32_t *total, u32_t *used) {
+  s32_t res = SPIFFS_OK;
+  SPIFFS_API_CHECK_MOUNT(fs);
+  SPIFFS_LOCK(fs);
+
+  u32_t pages_per_block = SPIFFS_PAGES_PER_BLOCK(fs);
+  u32_t blocks = fs->block_count;
+  u32_t obj_lu_pages = SPIFFS_OBJ_LOOKUP_PAGES(fs);
+  u32_t data_page_size = SPIFFS_DATA_PAGE_SIZE(fs);
+  u32_t total_data_pages = (blocks - 2) * (pages_per_block - obj_lu_pages) + 1; // -2 for spare blocks, +1 for emergency page
+
+  if (total) {
+    *total = total_data_pages * data_page_size;
+  }
+
+  if (used) {
+    *used = fs->stats_p_allocated * data_page_size;
+  }
+
+  SPIFFS_UNLOCK(fs);
+  return res;
+}
+
 s32_t SPIFFS_eof(spiffs *fs, spiffs_file fh) {
   SPIFFS_API_CHECK_MOUNT(fs);
   SPIFFS_LOCK(fs);
@@ -878,11 +904,14 @@ s32_t SPIFFS_vis(spiffs *fs) {
   } // per block
 
   spiffs_printf("era_cnt_max: %i\n", fs->max_erase_count);
-  spiffs_printf("last_errno:  %i\n", fs->errno);
+  spiffs_printf("last_errno:  %i\n", fs->err_code);
   spiffs_printf("blocks:      %i\n", fs->block_count);
   spiffs_printf("free_blocks: %i\n", fs->free_blocks);
   spiffs_printf("page_alloc:  %i\n", fs->stats_p_allocated);
   spiffs_printf("page_delet:  %i\n", fs->stats_p_deleted);
+  u32_t total, used;
+  SPIFFS_info(fs, &total, &used);
+  spiffs_printf("used:        %i of %i\n", used, total);
 
   SPIFFS_UNLOCK(fs);
   return res;
diff --git a/app/spiffs/spiffs_nucleus.c b/app/spiffs/spiffs_nucleus.c
index 74217cd0..ea15eba4 100644
--- a/app/spiffs/spiffs_nucleus.c
+++ b/app/spiffs/spiffs_nucleus.c
@@ -811,7 +811,7 @@ s32_t spiffs_object_append(spiffs_fd *fd, u32_t offset, u8_t *data, u32_t len) {
   s32_t res = SPIFFS_OK;
   u32_t written = 0;
 
-  res = spiffs_gc_check(fs, len);
+  res = spiffs_gc_check(fs, len + SPIFFS_DATA_PAGE_SIZE(fs)); // add an extra page of data worth for meta
   SPIFFS_CHECK_RES(res);
 
   spiffs_page_object_ix_header *objix_hdr = (spiffs_page_object_ix_header *)fs->work;
@@ -912,7 +912,7 @@ s32_t spiffs_object_append(spiffs_fd *fd, u32_t offset, u8_t *data, u32_t len) {
             res = spiffs_obj_lu_find_id_and_span(fs, fd->obj_id | SPIFFS_OBJ_ID_IX_FLAG, cur_objix_spix, 0, &pix);
             SPIFFS_CHECK_RES(res);
           }
-          SPIFFS_DBG("append: %04x found object index at page %04x\n", fd->obj_id, pix);
+          SPIFFS_DBG("append: %04x found object index at page %04x [fd size %i]\n", fd->obj_id, pix, fd->size);
           res = _spiffs_rd(fs, SPIFFS_OP_T_OBJ_IX | SPIFFS_OP_C_READ,
               fd->file_nbr, SPIFFS_PAGE_TO_PADDR(fs, pix), SPIFFS_CFG_LOG_PAGE_SZ(fs), fs->work);
           SPIFFS_CHECK_RES(res);
@@ -1003,8 +1003,8 @@ s32_t spiffs_object_append(spiffs_fd *fd, u32_t offset, u8_t *data, u32_t len) {
     // update size in object header index page
     res2 = spiffs_object_update_index_hdr(fs, fd, fd->obj_id,
         fd->objix_hdr_pix, 0, 0, offset+written, &new_objix_hdr_page);
-    SPIFFS_DBG("append: %04x store new size II %i in objix_hdr, %04x:%04x, written %i\n", fd->obj_id
-        , offset+written, new_objix_hdr_page, 0, written);
+    SPIFFS_DBG("append: %04x store new size II %i in objix_hdr, %04x:%04x, written %i, res %i\n", fd->obj_id
+        , offset+written, new_objix_hdr_page, 0, written, res2);
     SPIFFS_CHECK_RES(res2);
   } else {
     // wrote within object index header page
@@ -1386,13 +1386,20 @@ s32_t spiffs_object_truncate(
       ((spiffs_page_ix*)((u8_t *)objix + sizeof(spiffs_page_object_ix)))[SPIFFS_OBJ_IX_ENTRY(fs, data_spix)] = SPIFFS_OBJ_ID_FREE;
     }
 
+    SPIFFS_DBG("truncate: got data pix %04x\n", data_pix);
+
     if (cur_size - SPIFFS_DATA_PAGE_SIZE(fs) >= new_size) {
       // delete full data page
       res = spiffs_page_data_check(fs, fd, data_pix, data_spix);
-      if (res != SPIFFS_OK) break;
+      if (res != SPIFFS_ERR_DELETED && res != SPIFFS_OK) break;
+
+      if (res == SPIFFS_OK) {
+        res = spiffs_page_delete(fs, data_pix);
+        if (res != SPIFFS_OK) break;
+      } else if (res == SPIFFS_ERR_DELETED) {
+        res = SPIFFS_OK;
+      }
 
-      res = spiffs_page_delete(fs, data_pix);
-      if (res != SPIFFS_OK) break;
       // update current size
       if (cur_size % SPIFFS_DATA_PAGE_SIZE(fs) == 0) {
         cur_size -= SPIFFS_DATA_PAGE_SIZE(fs);
diff --git a/app/spiffs/spiffs_nucleus.h b/app/spiffs/spiffs_nucleus.h
index 9b10d918..b4a34bcf 100644
--- a/app/spiffs/spiffs_nucleus.h
+++ b/app/spiffs/spiffs_nucleus.h
@@ -247,19 +247,19 @@
 
 #define SPIFFS_API_CHECK_MOUNT(fs) \
   if (!SPIFFS_CHECK_MOUNT((fs))) { \
-    (fs)->errno = SPIFFS_ERR_NOT_MOUNTED; \
+    (fs)->err_code = SPIFFS_ERR_NOT_MOUNTED; \
     return -1; \
   }
 
 #define SPIFFS_API_CHECK_RES(fs, res) \
   if ((res) < SPIFFS_OK) { \
-    (fs)->errno = (res); \
+    (fs)->err_code = (res); \
     return -1; \
   }
 
 #define SPIFFS_API_CHECK_RES_UNLOCK(fs, res) \
   if ((res) < SPIFFS_OK) { \
-    (fs)->errno = (res); \
+    (fs)->err_code = (res); \
     SPIFFS_UNLOCK(fs); \
     return -1; \
   }
diff --git a/examples/fragment.lua b/examples/fragment.lua
index c3b980dc..9c531281 100644
--- a/examples/fragment.lua
+++ b/examples/fragment.lua
@@ -363,3 +363,10 @@ cs:func("myfun") -- post coap://192.168.18.103:5683/v1/f/myfun will call myfun
 cc = coap.Client()
 cc:get(coap.CON, "coap://192.168.18.100:5683/.well-known/core")
 cc:post(coap.NON, "coap://192.168.18.100:5683/", "Hello")
+
+
+file.open("test1.txt", "a+") for i = 1, 100*1000 do file.write("x") end file.close() print("Done.")
+for n,s in pairs(file.list()) do print(n.." size: "..s) end 
+file.remove("test1.txt")
+for n,s in pairs(file.list()) do print(n.." size: "..s) end
+file.open("test2.txt", "a+") for i = 1, 1*1000 do file.write("x") end file.close() print("Done.")