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shmem: convert shmem_delete_from_page_cache() to take a folio

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Remove the assertion that the page is not Compound as this function now
handles large folios correctly.

Link: https://lkml.kernel.org/r/20220902194653.1739778-8-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-09-02 20:46:03 +01:00 committed by Andrew Morton
parent f530ed0e2d
commit 4cd400fd1f
1 changed files with 11 additions and 12 deletions
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23
mm/shmem.c
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@ -763,23 +763,22 @@ error:
}
/*
* Like delete_from_page_cache, but substitutes swap for page.
* Like delete_from_page_cache, but substitutes swap for @folio.
*/
static void shmem_delete_from_page_cache(struct page *page, void *radswap)
static void shmem_delete_from_page_cache(struct folio *folio, void *radswap)
{
struct address_space *mapping = page->mapping;
struct address_space *mapping = folio->mapping;
long nr = folio_nr_pages(folio);
int error;
VM_BUG_ON_PAGE(PageCompound(page), page);
xa_lock_irq(&mapping->i_pages);
error = shmem_replace_entry(mapping, page->index, page, radswap);
page->mapping = NULL;
mapping->nrpages--;
__dec_lruvec_page_state(page, NR_FILE_PAGES);
__dec_lruvec_page_state(page, NR_SHMEM);
error = shmem_replace_entry(mapping, folio->index, folio, radswap);
folio->mapping = NULL;
mapping->nrpages -= nr;
__lruvec_stat_mod_folio(folio, NR_FILE_PAGES, -nr);
__lruvec_stat_mod_folio(folio, NR_SHMEM, -nr);
xa_unlock_irq(&mapping->i_pages);
put_page(page);
folio_put(folio);
BUG_ON(error);
}
@ -1416,7 +1415,7 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc)
spin_unlock_irq(&info->lock);
swap_shmem_alloc(swap);
shmem_delete_from_page_cache(&folio->page, swp_to_radix_entry(swap));
shmem_delete_from_page_cache(folio, swp_to_radix_entry(swap));
mutex_unlock(&shmem_swaplist_mutex);
BUG_ON(folio_mapped(folio));