CIFS: FS-Cache: Uncache unread pages in cifs_readpages() before freeing them
In cifs_readpages(), we may decide we don't want to read a page after all -
but the page may already have passed through fscache_read_or_alloc_pages() and
thus have marks and reservations set. Thus we have to call
fscache_readpages_cancel() or fscache_uncache_page() on the pages we're
returning to clear the marks.
NFS, AFS and 9P should be unaffected by this as they call read_cache_pages()
which does the cleanup for you.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index eb955b5..7ddddf2 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -3254,6 +3254,9 @@
/*
* Reads as many pages as possible from fscache. Returns -ENOBUFS
* immediately if the cookie is negative
+ *
+ * After this point, every page in the list might have PG_fscache set,
+ * so we will need to clean that up off of every page we don't use.
*/
rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list,
&num_pages);
@@ -3376,6 +3379,11 @@
kref_put(&rdata->refcount, cifs_readdata_release);
}
+ /* Any pages that have been shown to fscache but didn't get added to
+ * the pagecache must be uncached before they get returned to the
+ * allocator.
+ */
+ cifs_fscache_readpages_cancel(mapping->host, page_list);
return rc;
}
diff --git a/fs/cifs/fscache.c b/fs/cifs/fscache.c
index 2f4bc5a..b3258f3 100644
--- a/fs/cifs/fscache.c
+++ b/fs/cifs/fscache.c
@@ -223,6 +223,13 @@
fscache_uncache_page(CIFS_I(inode)->fscache, page);
}
+void __cifs_fscache_readpages_cancel(struct inode *inode, struct list_head *pages)
+{
+ cifs_dbg(FYI, "%s: (fsc: %p, i: %p)\n",
+ __func__, CIFS_I(inode)->fscache, inode);
+ fscache_readpages_cancel(CIFS_I(inode)->fscache, pages);
+}
+
void __cifs_fscache_invalidate_page(struct page *page, struct inode *inode)
{
struct cifsInodeInfo *cifsi = CIFS_I(inode);
diff --git a/fs/cifs/fscache.h b/fs/cifs/fscache.h
index 6353932..24794b6 100644
--- a/fs/cifs/fscache.h
+++ b/fs/cifs/fscache.h
@@ -54,6 +54,7 @@
struct address_space *,
struct list_head *,
unsigned *);
+extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *);
extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
@@ -91,6 +92,13 @@
__cifs_readpage_to_fscache(inode, page);
}
+static inline void cifs_fscache_readpages_cancel(struct inode *inode,
+ struct list_head *pages)
+{
+ if (CIFS_I(inode)->fscache)
+ return __cifs_fscache_readpages_cancel(inode, pages);
+}
+
#else /* CONFIG_CIFS_FSCACHE */
static inline int cifs_fscache_register(void) { return 0; }
static inline void cifs_fscache_unregister(void) {}
@@ -131,6 +139,11 @@
static inline void cifs_readpage_to_fscache(struct inode *inode,
struct page *page) {}
+static inline void cifs_fscache_readpages_cancel(struct inode *inode,
+ struct list_head *pages)
+{
+}
+
#endif /* CONFIG_CIFS_FSCACHE */
#endif /* _CIFS_FSCACHE_H */