Function report |
Source Code:fs\buffer.c |
Create Date:2022-07-28 20:14:12 |
Last Modify:2020-03-18 10:38:29 | Copyright©Brick |
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Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:nobh_truncate_page
Proto:int nobh_truncate_page(struct address_space *mapping, loff_t from, get_block_t *get_block)
Type:int
Parameter:
Type | Parameter | Name |
---|---|---|
struct address_space * | mapping | |
loff_t | from | |
get_block_t * | get_block |
2805 | index = from >> PAGE_SHIFT determines the page size |
2815 | blocksize = i_blocksize(inode) |
2819 | If Not length Then Return 0 |
2823 | iblock = index << PAGE_SHIFT determines the page size - i_blkbits |
2830 | If page_has_buffers(page) Then |
2831 | has_buffers : |
2834 | Return block_truncate_page(mapping, from, get_block) |
2844 | size of mapping = blocksize |
2845 | buffer state bitmap (see above) = 0 |
2850 | If Not buffer_mapped( & map_bh) Then Go to unlock |
2854 | If Not PageUptodate(page) Then |
2856 | If err Then |
2858 | Go to out |
2861 | If Not PageUptodate(page) Then |
2865 | If page_has_buffers(page) Then Go to has_buffers |
2869 | Dirty a page |
2870 | err = 0 |
2872 | unlock : |
2875 | out : |
2876 | Return err |
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