Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\readahead.c Create Date:2022-07-28 14:11:53
Last Modify:2020-03-17 21:13:07 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:ad_cache_pages - populate an address space with some pages & start reads against them*@mapping: the address_space*@pages: The address of a list_head which contains the target pages. These* pages have their ->index populated and are otherwise uninitialised.

Proto:int read_cache_pages(struct address_space *mapping, struct list_head *pages, int (*filler)(void *, struct page *), void *data)

Type:int

Parameter:

TypeParameterName
struct address_space *mapping
struct list_head *pages
int (*filler
void *data
92  ret = 0
94  When Not list_empty - tests whether a list is empty*@head: the list to test. cycle
95  page = lru_to_page(pages)
96  deletes entry from list
97  If add_to_page_cache_lru(page, mapping, Our offset within mapping. , readahead_gfp_mask(mapping)) Then
99  see if a page needs releasing upon read_cache_pages() failure* - the caller of read_cache_pages() may have set PG_private or PG_fscache* before calling, such as the NFS fs marking pages that are cached locally* on disk, thus we need to give the fs a
100  Continue
102  put_page(page)
104  ret = filler(data, page)
105  If Value for the false possibility is greater at compile time(ret) Then
106  lease a list of pages, invalidating them first if need be
107  Break
109  task_io_account_read(PAGE_SIZE)
111  Return ret