From: Miklos Szeredi <mszeredi@redhat.com>
Date: Wed, 23 Oct 2019 12:26:37 +0000 (+0200)
Subject: fuse: truncate pending writes on O_TRUNC
X-Git-Tag: v4.9.199~29
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=709c37e26c49faee2b3b45fe4eff459b99b9128e;p=platform%2Fkernel%2Flinux-amlogic.git

fuse: truncate pending writes on O_TRUNC

commit e4648309b85a78f8c787457832269a8712a8673e upstream.

Make sure cached writes are not reordered around open(..., O_TRUNC), with
the obvious wrong results.

Fixes: 4d99ff8f12eb ("fuse: Turn writeback cache on")
Cc: <stable@vger.kernel.org> # v3.15+
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 1b0e7b1039c1..92f905ea20b0 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -201,7 +201,7 @@ int fuse_open_common(struct inode *inode, struct file *file, bool isdir)
 {
 	struct fuse_conn *fc = get_fuse_conn(inode);
 	int err;
-	bool lock_inode = (file->f_flags & O_TRUNC) &&
+	bool is_wb_truncate = (file->f_flags & O_TRUNC) &&
 			  fc->atomic_o_trunc &&
 			  fc->writeback_cache;
 
@@ -209,16 +209,20 @@ int fuse_open_common(struct inode *inode, struct file *file, bool isdir)
 	if (err)
 		return err;
 
-	if (lock_inode)
+	if (is_wb_truncate) {
 		inode_lock(inode);
+		fuse_set_nowrite(inode);
+	}
 
 	err = fuse_do_open(fc, get_node_id(inode), file, isdir);
 
 	if (!err)
 		fuse_finish_open(inode, file);
 
-	if (lock_inode)
+	if (is_wb_truncate) {
+		fuse_release_nowrite(inode);
 		inode_unlock(inode);
+	}
 
 	return err;
 }