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fs: use pagevec_lookup_range() in page_cache_seek_hole_data() 

We want only pages from given range in page_cache_seek_hole_data().  Use
pagevec_lookup_range() instead of pagevec_lookup() and remove
unnecessary code.

Note that the check for getting less pages than desired can be removed
because index gets updated by pagevec_lookup_range().

Link: http://lkml.kernel.org/r/20170726114704.7626-9-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>
hifive-unleashed-5.1
Jan Kara 2017-09-06 16:21:37 -07:00 committed by Linus Torvalds
parent 48f2301c07
commit 8338141f0f
1 changed files with 3 additions and 13 deletions
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16
fs/buffer.c
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@ -3549,11 +3549,10 @@ page_cache_seek_hole_data(struct inode *inode, loff_t offset, loff_t length,
pagevec_init(&pvec, 0);
do {
unsigned want, nr_pages, i;
unsigned nr_pages, i;
want = min_t(unsigned, end - index, PAGEVEC_SIZE);
nr_pages = pagevec_lookup(&pvec, inode->i_mapping, &index,
want);
nr_pages = pagevec_lookup_range(&pvec, inode->i_mapping, &index,
end - 1, PAGEVEC_SIZE);
if (nr_pages == 0)
break;
@ -3574,10 +3573,6 @@ page_cache_seek_hole_data(struct inode *inode, loff_t offset, loff_t length,
lastoff < page_offset(page))
goto check_range;
/* Searching done if the page index is out of range. */
if (page->index >= end)
goto not_found;
lock_page(page);
if (likely(page->mapping == inode->i_mapping) &&
page_has_buffers(page)) {
@ -3590,11 +3585,6 @@ page_cache_seek_hole_data(struct inode *inode, loff_t offset, loff_t length,
unlock_page(page);
lastoff = page_offset(page) + PAGE_SIZE;
}
/* Searching done if fewer pages returned than wanted. */
if (nr_pages < want)
break;
pagevec_release(&pvec);
} while (index < end);