The patch titled
Subject: mm: use find_get_pages_range() in filemap_range_has_page()
has been added to the -mm tree. Its filename is
mm-use-find_get_pages_range-in-filemap_range_has_page.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-use-find_get_pages_range-in-filemap_range_has_page.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-use-find_get_pages_range-in-filemap_range_has_page.patch
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------------------------------------------------------
From: Jan Kara <jack@xxxxxxx>
Subject: mm: use find_get_pages_range() in filemap_range_has_page()
We want only pages from given range in filemap_range_has_page(),
furthermore we want at most a single page. So use find_get_pages_range()
instead of pagevec_lookup() and remove unnecessary code.
Link: http://lkml.kernel.org/r/20170726114704.7626-10-jack@xxxxxxx
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/filemap.c | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)
diff -puN mm/filemap.c~mm-use-find_get_pages_range-in-filemap_range_has_page mm/filemap.c
--- a/mm/filemap.c~mm-use-find_get_pages_range-in-filemap_range_has_page
+++ a/mm/filemap.c
@@ -393,8 +393,7 @@ bool filemap_range_has_page(struct addre
{
pgoff_t index = start_byte >> PAGE_SHIFT;
pgoff_t end = end_byte >> PAGE_SHIFT;
- struct pagevec pvec;
- bool ret;
+ struct page *page;
if (end_byte < start_byte)
return false;
@@ -402,12 +401,10 @@ bool filemap_range_has_page(struct addre
if (mapping->nrpages == 0)
return false;
- pagevec_init(&pvec, 0);
- if (!pagevec_lookup(&pvec, mapping, &index, 1))
+ if (!find_get_pages_range(mapping, &index, end, 1, &page))
return false;
- ret = (pvec.pages[0]->index <= end);
- pagevec_release(&pvec);
- return ret;
+ put_page(page);
+ return true;
}
EXPORT_SYMBOL(filemap_range_has_page);
_
Patches currently in -mm which might be from jack@xxxxxxx are
fscache-remove-unused-now_uncached-callback.patch
mm-make-pagevec_lookup-update-index.patch
mm-implement-find_get_pages_range.patch
fs-fix-performance-regression-in-clean_bdev_aliases.patch
ext4-use-pagevec_lookup_range-in-ext4_find_unwritten_pgoff.patch
ext4-use-pagevec_lookup_range-in-writeback-code.patch
hugetlbfs-use-pagevec_lookup_range-in-remove_inode_hugepages.patch
fs-use-pagevec_lookup_range-in-page_cache_seek_hole_data.patch
mm-use-find_get_pages_range-in-filemap_range_has_page.patch
mm-remove-nr_pages-argument-from-pagevec_lookup_range.patch
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