generic_write

函数名称：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.

函数原型：inline ssize_t generic_write_checks(struct kiocb *iocb, struct iov_iter *from)

返回类型：ssize_t

参数：

类型	参数	名称
struct kiocb *	iocb
struct iov_iter *	from

2940

file等于文件指针

2941

inode等于host

2945

如果IS_SWAPFILE(inode)则返回:负ETXTBSY

2948

如果非iov_iter_count(from)则返回:0

2952

如果ki_flags按位与IOCB_APPEND则文件偏移等于NOTE: in a 32bit arch with a preemptable kernel and* an UP compile the i_size_read/write must be atomic* with respect to the local cpu (unlike with preempt disabled),* but they don't need to be atomic with respect to other cpus like in* true SMP (so they

2955

如果ki_flags按位与IOCB_NOWAIT且非ki_flags按位与IOCB_DIRECT的值则返回:负EINVAL

2958

count等于iov_iter_count(from)

2959

ret等于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.

2960

如果ret则返回:ret

2963

Cap the iov_iter by given limit; note that the second argument is* *not* the new size - it's upper limit for such. Passing it a value* greater than the amount of data in iov_iter is fine - it'll just do* nothing in that case.

2964

返回:iov_iter_count(from)

**调用者**
名称	描述
generic_file_write_iter	generic_file_write_iter - write data to a file@iocb: IO state structure@from: iov_iter with data to write* This is a wrapper around __generic_file_write_iter() to be used by most* filesystems. It takes care of syncing the file in case of O_SYNC file

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告