Function report |
Source Code:fs\iomap\buffered-io.c |
Create Date:2022-07-28 20:31:53 |
Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
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Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:iomap_write_begin
Proto:static int iomap_write_begin(struct inode *inode, loff_t pos, unsigned len, unsigned flags, struct page **pagep, struct iomap *iomap, struct iomap *srcmap)
Type:int
Parameter:
Type | Parameter | Name |
---|---|---|
struct inode * | inode | |
loff_t | pos | |
unsigned | len | |
unsigned | flags | |
struct page ** | pagep | |
struct iomap * | iomap | |
struct iomap * | srcmap |
646 | status = 0 |
649 | If srcmap != iomap Then BUG_ON(pos + len > file offset of mapping, bytes + length of mapping, bytes ) |
652 | If fatal_signal_pending(current process) Then Return -EINTR |
655 | If page_ops && page_prepare Then |
661 | page = Find or create a page at the given pagecache position. Return the locked* page. This function is specifically for buffered writes. |
663 | If Not page Then |
665 | Go to out_no_page |
668 | If type of mapping == data inline in the inode Then iomap_read_inline_data(inode, page, srcmap) |
670 | Else if flags for mapping & IOMAP_F_BUFFER_HEAD Then status = __block_write_begin_int(page, pos, len, NULL, srcmap) |
676 | If Value for the false possibility is greater at compile time(status) Then Go to out_unlock |
680 | Return 0 |
682 | out_unlock : |
685 | iomap_write_failed(inode, pos, len) |
687 | out_no_page : |
690 | Return status |
Name | Describe |
---|---|
iomap_write_actor | |
iomap_unshare_actor | |
iomap_zero |
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