lkml.org 
[lkml]   [2018]   [Feb]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v7 32/61] page cache: Convert filemap_range_has_page to XArray
Date
From: Matthew Wilcox <mawilcox@microsoft.com>

Instead of calling find_get_pages_range() and putting any reference,
just use xa_find() to look for a page in the right range.

Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
---
mm/filemap.c | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 3735ea6e3d19..a02d69a957e4 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -460,18 +460,11 @@ bool filemap_range_has_page(struct address_space *mapping,
{
pgoff_t index = start_byte >> PAGE_SHIFT;
pgoff_t end = end_byte >> PAGE_SHIFT;
- struct page *page;

if (end_byte < start_byte)
return false;

- if (mapping->nrpages == 0)
- return false;
-
- if (!find_get_pages_range(mapping, &index, end, 1, &page))
- return false;
- put_page(page);
- return true;
+ return xa_find(&mapping->pages, &index, end, XA_PRESENT);
}
EXPORT_SYMBOL(filemap_range_has_page);

--
2.16.1
\
 
 \ /
  Last update: 2018-02-19 21:00    [W:0.296 / U:0.024 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site