generic_write_check

函数名称：Don't operate on ranges the page cache doesn't support, and don't exceed the* LFS limits. If pos is under the limit it becomes a short access. If it* exceeds the limit we return -EFBIG.

函数原型：static int generic_write_check_limits(struct file *file, loff_t pos, loff_t *count)

返回类型：int

参数：

类型	参数	名称
struct file *	file
loff_t	pos
loff_t *	count

2913

如果pos大于等于limit则

2914

send_sig(SIGXFSZ, 当前进程, 0)

2915

返回:负EFBIG

2917

count等于两数取小( * count, limit - pos)

**调用者**
名称	描述
generic_write_checks	Performs necessary checks before doing a write* Can adjust writing position or amount of bytes to write.* Returns appropriate error code that caller should return or* zero in case that write should be allowed.
generic_remap_checks	Performs necessary checks before doing a clone.* Can adjust amount of bytes to clone via @req_count argument.* Returns appropriate error code that caller should return or* zero in case the clone should be allowed.
generic_copy_file_checks	Performs necessary checks before doing a file copy* Can adjust amount of bytes to copy via @req_count argument.* Returns appropriate error code that caller should return or* zero in case the copy should be allowed.

函数逻辑报告