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authorMatthew Wilcox (Oracle) <willy@infradead.org>2020-10-14 02:51:34 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-14 04:38:29 +0300
commita6de4b4873e1e352f5029b0f5b3c347427d74ab4 (patch)
treee2ec202673fae7a9f7c5f1ccd87aeb8d9577be2a /mm/filemap.c
parent9dfc8ff34b951f83632815a87e97a625a11360f0 (diff)
downloadlinux-a6de4b4873e1e352f5029b0f5b3c347427d74ab4.tar.xz
mm: convert find_get_entry to return the head page
There are only four callers remaining of find_get_entry(). get_shadow_from_swap_cache() only wants to see shadow entries and doesn't care about which page is returned. Push the find_subpage() call into find_lock_entry(), find_get_incore_page() and pagecache_get_page(). [willy@infradead.org: fix oops] Link: https://lkml.kernel.org/r/20200914112738.GM6583@casper.infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Huang Ying <ying.huang@intel.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Matthew Auld <matthew.auld@intel.com> Cc: William Kucharski <william.kucharski@oracle.com> Link: https://lkml.kernel.org/r/20200910183318.20139-7-willy@infradead.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/filemap.c')
-rw-r--r--mm/filemap.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 089a2f02067f..9457d4f8b1c1 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1645,19 +1645,19 @@ EXPORT_SYMBOL(page_cache_prev_miss);
/**
* find_get_entry - find and get a page cache entry
* @mapping: the address_space to search
- * @offset: the page cache index
+ * @index: The page cache index.
*
* Looks up the page cache slot at @mapping & @offset. If there is a
- * page cache page, it is returned with an increased refcount.
+ * page cache page, the head page is returned with an increased refcount.
*
* If the slot holds a shadow entry of a previously evicted page, or a
* swap entry from shmem/tmpfs, it is returned.
*
- * Return: the found page or shadow entry, %NULL if nothing is found.
+ * Return: The head page or shadow entry, %NULL if nothing is found.
*/
-struct page *find_get_entry(struct address_space *mapping, pgoff_t offset)
+struct page *find_get_entry(struct address_space *mapping, pgoff_t index)
{
- XA_STATE(xas, &mapping->i_pages, offset);
+ XA_STATE(xas, &mapping->i_pages, index);
struct page *page;
rcu_read_lock();
@@ -1685,7 +1685,6 @@ repeat:
put_page(page);
goto repeat;
}
- page = find_subpage(page, offset);
out:
rcu_read_unlock();
@@ -1722,6 +1721,7 @@ repeat:
put_page(page);
goto repeat;
}
+ page = find_subpage(page, offset);
VM_BUG_ON_PAGE(page_to_pgoff(page) != offset, page);
}
return page;
@@ -1768,6 +1768,7 @@ repeat:
page = NULL;
if (!page)
goto no_page;
+ page = find_subpage(page, index);
if (fgp_flags & FGP_LOCK) {
if (fgp_flags & FGP_NOWAIT) {