[ 150/153] fs: cachefiles: add support for large files in filesystem caching

[Ben Hutchings]

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Justin Lecher <jlec@xxxxxxxxxx>

commit 98c350cda2c14a343d34ea01a3d9c24fea5ec66d upstream.

Support the caching of large files.

Addresses https://bugzilla.kernel.org/show_bug.cgi?id=31182

Signed-off-by: Justin Lecher <jlec@xxxxxxxxxx>
Signed-off-by: Suresh Jayaraman <sjayaraman@xxxxxxxx>
Tested-by: Suresh Jayaraman <sjayaraman@xxxxxxxx>
Acked-by: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
[bwh: Backported to 3.2: 
 - Adjust context
 - dentry_open() takes dentry and vfsmount pointers, not a path pointer]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
--- a/fs/cachefiles/rdwr.c
+++ b/fs/cachefiles/rdwr.c
@@ -918,7 +918,7 @@ int cachefiles_write_page(struct fscache_storage *op, struct page *page)
 	 * own time */
 	dget(object->backer);
 	mntget(cache->mnt);
-	file = dentry_open(object->backer, cache->mnt, O_RDWR,
+	file = dentry_open(object->backer, cache->mnt, O_RDWR | O_LARGEFILE,
 			   cache->cache_cred);
 	if (IS_ERR(file)) {
 		ret = PTR_ERR(file);



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