函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\mpage.c Create Date:2022-07-29 10:46:57
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：support function for mpage_readpages

函数原型：static void map_buffer_to_page(struct page *page, struct buffer_head *bh, int page_block)

返回类型：void

参数：

类型参数名称
struct page *page
struct buffer_head *bh
intpage_block
106  inode等于host
108  block等于0
110  如果非page_has_buffers(page)则
115  如果i_blkbits恒等于PAGE_SHIFT determines the page size 且Emit the buffer bitops functions. Note that there are also functions* of the form "mark_buffer_foo()". These are higher-level functions which* do something in addition to setting a b_state bit.则
117  SetPageUptodate(page)
118  返回
120  We attach and possibly dirty the buffers atomically wrt* __set_page_dirty_buffers() via private_lock. try_to_free_buffers* is already excluded via the page lock.
122  head等于If we *know* page->private refers to buffer_heads (page)
123  page_bh等于head
124  循环
125  如果block恒等于page_block则
126  buffer state bitmap (see above) 等于 buffer state bitmap (see above)
127  b_bdev等于b_bdev
128  start block number 等于 start block number
129  退出
131  page_bh等于 circular list of page's buffers
132  block自加
133  当page_bh不等于head循环
调用者
名称描述
do_mpage_readpageThis is the worker routine which does all the work of mapping the disk* blocks and constructs largest possible bios, submits them for IO if the* blocks are not contiguous on the disk