truncate_setsize

函数名称：runcate_setsize - update inode and pagecache for a new file size*@inode: inode*@newsize: new file size* truncate_setsize updates i_size and performs pagecache truncation (if* necessary) to @newsize. It will be typically be called from the filesystem's

函数原型：void truncate_setsize(struct inode *inode, loff_t newsize)

返回类型：void

参数：

类型	参数	名称
struct inode *	inode
loff_t	newsize

837

oldsize等于i_size

839

NOTE: unlike i_size_read(), i_size_write() does need locking around it* (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount* can be lost, resulting in subsequent i_size_read() calls spinning forever.

840

如果newsize大于oldsize则pagecache_isize_extended - update pagecache after extension of i_size*@inode: inode for which i_size was extended*@from: original inode size*@to: new inode size* Handle extension of inode size either caused by extending truncate or by

842

runcate_pagecache - unmap and remove pagecache that has been truncated*@inode: inode*@newsize: new file size* inode's new i_size must already be written before truncate_pagecache* is called.* This function should typically be called before the filesystem

**调用者**
名称	描述
put_aio_ring_file
ramfs_nommu_resize
simple_setattr	simple_setattr - setattr for simple filesystem@dentry: dentry@iattr: iattr structure* Returns 0 on success, -error on failure

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