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mm: Convert remove_mapping() to take a folio

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Add kernel-doc and return the number of pages removed in order to
get the statistics right in __invalidate_mapping_pages().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-02-12 22:48:55 -05:00
parent e41c81d0d3
commit 5100da38ef
4 changed files with 18 additions and 14 deletions
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5
fs/splice.c
View file

@ -46,8 +46,7 @@
static bool page_cache_pipe_buf_try_steal(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
{
struct page *page = buf->page;
struct folio *folio = page_folio(page);
struct folio *folio = page_folio(buf->page);
struct address_space *mapping;
folio_lock(folio);
@ -74,7 +73,7 @@ static bool page_cache_pipe_buf_try_steal(struct pipe_inode_info *pipe,
* If we succeeded in removing the mapping, set LRU flag
* and return good.
*/
if (remove_mapping(mapping, page)) {
if (remove_mapping(mapping, folio)) {
buf->flags |= PIPE_BUF_FLAG_LRU;
return true;
}

2
include/linux/swap.h
View file

@ -395,7 +395,7 @@ extern unsigned long mem_cgroup_shrink_node(struct mem_cgroup *mem,
unsigned long *nr_scanned);
extern unsigned long shrink_all_memory(unsigned long nr_pages);
extern int vm_swappiness;
extern int remove_mapping(struct address_space *mapping, struct page *page);
long remove_mapping(struct address_space *mapping, struct folio *folio);
extern unsigned long reclaim_pages(struct list_head *page_list);
#ifdef CONFIG_NUMA

2
mm/truncate.c
View file

@ -294,7 +294,7 @@ int invalidate_inode_page(struct page *page)
if (folio_has_private(folio) && !filemap_release_folio(folio, 0))
return 0;
return remove_mapping(mapping, page);
return remove_mapping(mapping, folio);
}
/**

23
mm/vmscan.c
View file

@ -1335,23 +1335,28 @@ static int __remove_mapping(struct address_space *mapping, struct folio *folio,
return 0;
}
/*
* Attempt to detach a locked page from its ->mapping. If it is dirty or if
* someone else has a ref on the page, abort and return 0. If it was
* successfully detached, return 1. Assumes the caller has a single ref on
* this page.
/**
* remove_mapping() - Attempt to remove a folio from its mapping.
* @mapping: The address space.
* @folio: The folio to remove.
*
* If the folio is dirty, under writeback or if someone else has a ref
* on it, removal will fail.
* Return: The number of pages removed from the mapping. 0 if the folio
* could not be removed.
* Context: The caller should have a single refcount on the folio and
* hold its lock.
*/
int remove_mapping(struct address_space *mapping, struct page *page)
long remove_mapping(struct address_space *mapping, struct folio *folio)
{
struct folio *folio = page_folio(page);
if (__remove_mapping(mapping, folio, false, NULL)) {
/*
* Unfreezing the refcount with 1 rather than 2 effectively
* Unfreezing the refcount with 1 effectively
* drops the pagecache ref for us without requiring another
* atomic operation.
*/
folio_ref_unfreeze(folio, 1);
return 1;
return folio_nr_pages(folio);
}
return 0;
}