pagecache_isize

函数名称：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

函数原型：void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to)

返回类型：void

参数：

类型	参数	名称
struct inode *	inode
loff_t	from
loff_t	to

867

bsize等于i_blocksize(inode)

872

WARN_ON(to > i_size)

874

如果from大于等于to或bsize恒等于PAGE_SIZE则返回

877

rounded_from等于und_up - round up to next specified power of 2*@x: the value to round*@y: multiple to round up to (must be a power of 2)* Rounds @x up to next multiple of @y (which must be a power of 2).* To perform arbitrary rounding up, use roundup() below.(from, bsize)

878

如果to小于等于rounded_from或非rounded_from按位与PAGE_SIZE减1的值则返回

881

index等于from右移PAGE_SHIFT determines the page size 位

882

page等于d_lock_page - locate, pin and lock a pagecache page*@mapping: the address_space to search*@offset: the page index* Looks up the page cache slot at @mapping & @offset. If there is a* page cache page, it is returned locked and with an increased* refcount.

884

如果非page则返回

890

如果Cleans the PTEs of shared mappings.* (and since clean PTEs should also be readonly, write protects them too)* returns the number of cleaned PTEs.则Dirty a page

892

lock_page - unlock a locked page*@page: the page* Unlocks the page and wakes up sleepers in ___wait_on_page_locked().* Also wakes sleepers in wait_on_page_writeback() because the wakeup* mechanism between PageLocked pages and PageWriteback pages is shared.

893

put_page(page)

**调用者**
名称	描述
truncate_setsize	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
iomap_write_end
generic_write_end

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