mkfs.ext2 mkfs.vfat 格式化u盘时失败

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本文介绍了解决在Linux环境下使用mkfs.vfat格式化工具时遇到的lseek: Valuetoolargefordefineddatatype错误的方法。通过修改内核源代码和uClibc中的相关实现，成功解决了该问题。

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今天在linux格式化时碰到个问题：

mkfs.vfat: lseek: Value too large for defined data type

传说中的解决如下：

I solved my problem for lseek() call.

The followings is a patch.

>> linux kernel.

--- a/arch/openrisc/include/asm/unistd.h
+++ b/arch/openrisc/include/asm/unistd.h
@@ -35,4 +35,9 @@
#define __NR_or1k_atomic __NR_arch_specific_syscall
__SYSCALL(__NR_or1k_atomic, sys_or1k_atomic)

+#define __NR__llseek (__NR_arch_specific_syscall+1)
+__SYSCALL(__NR__llseek, sys_llseek)
+
+
+
#endif /* __ASM_OPENRISC_UNISTD_H */

--- a/include/asm-generic/unistd.h
+++ b/include/asm-generic/unistd.h
@@ -198,8 +198,7 @@ __SC_COMP(__NR_getdents64, sys_getdents64, compat_sys_getdents64)

/* fs/read_write.c */
#define __NR3264_lseek 62
-//__SC_3264(__NR3264_lseek, sys_llseek, sys_lseek)
-__SYSCALL(__NR3264_lseek, sys_llseek)
+__SC_3264(__NR3264_lseek, sys_llseek, sys_lseek)
#define __NR_read 63
__SYSCALL(__NR_read, sys_read)
#define __NR_write 64
@@ -780,8 +779,8 @@ __SYSCALL(__NR_newfstatat, sys_newfstatat)
__SYSCALL(__NR_fstatfs, sys_fstatfs)
#define __NR_statfs 1056
__SYSCALL(__NR_statfs, sys_statfs)
-#define __NR_lseek 1057
-__SYSCALL(__NR_lseek, sys_lseek) //for test.
+//#define __NR_lseek 1057
+//__SYSCALL(__NR_lseek, sys_lseek)
#define __NR_mmap 1058
__SYSCALL(__NR_mmap, sys_mmap)

>> uClibc
=====================================================
--- a/uClibc/libc/sysdeps/linux/common/llseek.c
+++ b/uClibc/libc/sysdeps/linux/common/llseek.c
@@ -15,9 +15,12 @@

loff_t lseek64(int fd, loff_t offset, int whence)
{
- loff_t result;
- return (loff_t)(INLINE_SYSCALL(_llseek, 5, fd, (off_t) (offset >> 32),
+ loff_t result,ret;
+
+ ret = (INLINE_SYSCALL(_llseek, 5, fd, (off_t) (offset >> 32),
(off_t) (offset & 0xffffffff), &result, whence) ?: result);
+
+ return result;
}

#else