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ext4: Convert mpage_release_unused_pages() to use filemap_get_folios()

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If the folio is large, it may overlap the beginning or end of the
unused range.  If it does, we need to avoid invalidating it.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christian Brauner (Microsoft) <brauner@kernel.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-06-03 15:36:49 -04:00
parent 9e0b6f31ba
commit fb5a5be05f
1 changed files with 12 additions and 9 deletions
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21
fs/ext4/inode.c
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@ -1554,9 +1554,9 @@ struct mpage_da_data {
static void mpage_release_unused_pages(struct mpage_da_data *mpd,
bool invalidate)
{
int nr_pages, i;
unsigned nr, i;
pgoff_t index, end;
struct pagevec pvec;
struct folio_batch fbatch;
struct inode *inode = mpd->inode;
struct address_space *mapping = inode->i_mapping;
@ -1574,15 +1574,18 @@ static void mpage_release_unused_pages(struct mpage_da_data *mpd,
ext4_es_remove_extent(inode, start, last - start + 1);
}
pagevec_init(&pvec);
folio_batch_init(&fbatch);
while (index <= end) {
nr_pages = pagevec_lookup_range(&pvec, mapping, &index, end);
if (nr_pages == 0)
nr = filemap_get_folios(mapping, &index, end, &fbatch);
if (nr == 0)
break;
for (i = 0; i < nr_pages; i++) {
struct page *page = pvec.pages[i];
struct folio *folio = page_folio(page);
for (i = 0; i < nr; i++) {
struct folio *folio = fbatch.folios[i];
if (folio->index < mpd->first_page)
continue;
if (folio->index + folio_nr_pages(folio) - 1 > end)
continue;
BUG_ON(!folio_test_locked(folio));
BUG_ON(folio_test_writeback(folio));
if (invalidate) {
@ -1594,7 +1597,7 @@ static void mpage_release_unused_pages(struct mpage_da_data *mpd,
}
folio_unlock(folio);
}
pagevec_release(&pvec);
folio_batch_release(&fbatch);
}
}