vfs_fsync

函数名称：vfs_fsync_range - helper to sync a range of data & metadata to disk*@file: file to sync*@start: offset in bytes of the beginning of data range to sync*@end: offset in bytes of the end of data range (inclusive)*@datasync: perform only datasync

函数原型：int vfs_fsync_range(struct file *file, loff_t start, loff_t end, int datasync)

返回类型：int

参数：

类型	参数	名称
struct file *	file
loff_t	start
loff_t	end
int	datasync

**调用者**
名称	描述
vfs_fsync	vfs_fsync - perform a fsync or fdatasync on a file@file: file to sync@datasync: only perform a fdatasync operation* Write back data and metadata for @file to disk. If @datasync is* set only metadata needed to access modified file data is written.
io_fsync_finish
dax_finish_sync_fault	dax_finish_sync_fault - finish synchronous page fault@vmf: The description of the fault@pe_size: Size of entry to be inserted@pfn: PFN to insert This function ensures that the file range touched by the page fault is* stored persistently on the media
SYSCALL_DEFINE3	MS_SYNC syncs the entire file - including mappings
generic_write_sync	Sync the bytes written if this was a synchronous write. Expect ki_pos* to already be updated for the write, and will return either the amount* of bytes passed in, or an error if syncing the file failed.

函数逻辑报告