[建议]elm FatFs中MAX_SECTOR_SIZE的处理

发布于 2013-07-26 19:56:50 浏览：3667 订阅该版

5 个回答

flydream0 2013-08-26

这家伙很懒，什么也没写！

flydream0 2013-08-26

这家伙很懒，什么也没写！

prife 2013-08-26

这家伙很懒，什么也没写！

aozima 2013-11-04

调网络不抓包，调I2C等时序不上逻辑分析仪，就像电工不用万用表！多用整理的好的文字，比截图更省流量，还能在整理过程中思考。

在RT-Thread的fatfs应用场景中，虽然扇区设置为512，但还是有可能去挂载大于512字节扇区的存储器。
此时如果不提前做检查，会导致写穿。

```patch
 components/dfs/filesystems/elmfat/ff.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/components/dfs/filesystems/elmfat/ff.c b/components/dfs/filesystems/elmfat/ff.c
index 014d70f..5a0d340 100644
--- a/components/dfs/filesystems/elmfat/ff.c
+++ b/components/dfs/filesystems/elmfat/ff.c
@@ -108,12 +108,12 @@
 #if _MAX_SS != 512 && _MAX_SS != 1024 && _MAX_SS != 2048 && _MAX_SS != 4096
 #error Wrong sector size.
 #endif
-#if _MAX_SS != 512
-#define	SS(fs)	((fs)->ssize)	/* Multiple sector size */
-#else
-#define	SS(fs)	512U			/* Fixed sector size */
-#endif
 
+// #if _MAX_SS != 512
+#define	SS(fs)	((fs)->ssize)	/* Multiple sector size */
+// #else
+// #define	SS(fs)	512U			/* Fixed sector size */
+// #endif
 
 /* Reentrancy related */
 #if _FS_REENTRANT
@@ -2058,10 +2058,12 @@ FRESULT chk_mounted (	/* FR_OK(0): successful, !=0: any error occurred */
 	stat = disk_initialize(fs->drv);	/* Initialize low level disk I/O layer */
 	if (stat & STA_NOINIT)				/* Check if the initialization succeeded */
 		return FR_NOT_READY;			/* Failed to initialize due to no media or hard error */
-#if _MAX_SS != 512						/* Get disk sector size (variable sector size cfg only) */
+
+//#if _MAX_SS != 512						/* Get disk sector size (variable sector size cfg only) */
 	if (disk_ioctl(fs->drv, GET_SECTOR_SIZE, &fs->ssize) != RES_OK)
 		return FR_DISK_ERR;
-#endif
+//#endif
+
 #if !_FS_READONLY
 	if (chk_wp && (stat & STA_PROTECT))	/* Check disk write protection if needed */
 		return FR_WRITE_PROTECTED;
@@ -3601,10 +3603,12 @@ FRESULT f_mkfs (
 	stat = disk_initialize(drv);
 	if (stat & STA_NOINIT) return FR_NOT_READY;
 	if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
-#if _MAX_SS != 512					/* Get disk sector size */
+
+//#if _MAX_SS != 512					/* Get disk sector size */
 	if (disk_ioctl(drv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK)
 		return FR_DISK_ERR;
-#endif
+//#endif
+
 	if (disk_ioctl(drv, GET_SECTOR_COUNT, &n_vol) != RES_OK || n_vol < 128)
 		return FR_DISK_ERR;
 	b_vol = (sfd) ? 0 : 63;	/* Volume start sector */
```