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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@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Kara 2017-09-06 16:21:40 -07:00 committed by Linus Torvalds
parent 8338141f0f
commit f7b6804687
1 changed files with 4 additions and 7 deletions
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11
mm/filemap.c
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@ -393,8 +393,7 @@ bool filemap_range_has_page(struct address_space *mapping,
{
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 address_space *mapping,
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);