Function report |
Source Code:fs\buffer.c |
Create Date:2022-07-28 20:14:10 |
Last Modify:2020-03-18 10:38:29 | Copyright©Brick |
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Name:lock_write_begin takes care of the basic task of block allocation and* bringing partial write blocks uptodate first.* The filesystem needs to handle block truncation upon failure.
Proto:int block_write_begin(struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, get_block_t *get_block)
Type:int
Parameter:
Type | Parameter | Name |
---|---|---|
struct address_space * | mapping | |
loff_t | pos | |
unsigned | len | |
unsigned | flags | |
struct page ** | pagep | |
get_block_t * | get_block |
2109 | index = pos >> PAGE_SHIFT determines the page size |
2113 | page = Find or create a page at the given pagecache position. Return the locked* page. This function is specifically for buffered writes. |
2121 | page = NULL |
2125 | Return status |
Name | Describe |
---|---|
cont_write_begin | For moronic filesystems that do not allow holes in file.* We may have to extend the file. |
blkdev_write_begin |
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