Function report |
Source Code:fs\buffer.c |
Create Date:2022-07-28 20:14:08 |
Last Modify:2020-03-18 10:38:29 | Copyright©Brick |
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Name:Create the appropriate buffers when given a page for data area and* the size of each buffer
Proto:struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size, bool retry)
Type:struct buffer_head
Parameter:
Type | Parameter | Name |
---|---|---|
struct page * | page | |
unsigned long | size | |
bool | retry |
858 | gfp = GFP_NOFS | __GFP_ACCOUNT |
862 | If retry Then gfp |= __GFP_NOFAIL |
868 | head = NULL |
871 | bh = alloc_buffer_head(gfp) |
876 | start block number = -1 |
879 | size of mapping = size |
882 | set_bh_page(bh, page, offset) |
884 | out : |
886 | mem_cgroup_put(memcg) |
887 | Return head |
891 | no_grow : |
892 | If head Then |
893 | Do |
900 | Go to out |
Name | Describe |
---|---|
grow_dev_page | Create the page-cache page that contains the requested block.* This is used purely for blockdev mappings. |
create_empty_buffers | 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. |
nobh_write_begin | On entry, the page is fully not uptodate.* On exit the page is fully uptodate in the areas outside (from,to)* The filesystem needs to handle block truncation upon failure. |
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