If we hit the 'index == next_cached' case, we leak a refcount on the
struct page. Fix this by using readahead_folio() which takes care of
the refcount for you.
Fixes: 0174ee9947bd ("cifs: Implement cache I/O by accessing the cache directly")
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
fs/cifs/file.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index e64cda7a7610..6985710e14c2 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -4459,10 +4459,10 @@ static void cifs_readahead(struct readahead_control *ractl)
* TODO: Send a whole batch of pages to be read
* by the cache.
*/
- page = readahead_page(ractl);
- last_batch_size = 1 << thp_order(page);
+ struct folio *folio = readahead_folio(ractl);
+ last_batch_size = folio_nr_pages(folio);
if (cifs_readpage_from_fscache(ractl->mapping->host,
- page) < 0) {
+ &folio->page) < 0) {
/*
* TODO: Deal with cache read failure
* here, but for the moment, delegate
@@ -4470,7 +4470,7 @@ static void cifs_readahead(struct readahead_control *ractl)
*/
caching = false;
}
- unlock_page(page);
+ folio_unlock(folio);
next_cached++;
cache_nr_pages--;
if (cache_nr_pages == 0)
--
2.35.1
