linux-kernel - [PATCH 08/16] fuse: Flush files on wb close -v2

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Date:	Thu, 11 Jul 2013 20:18:42 +0400
From:	Maxim Patlasov <MPatlasov@...allels.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	dev@...allels.com, xemul@...allels.com,
	fuse-devel@...ts.sourceforge.net, bfoster@...hat.com,
	miklos@...redi.hu, linux-kernel@...r.kernel.org,
	jbottomley@...allels.com, viro@...iv.linux.org.uk,
	linux-fsdevel@...r.kernel.org, devel@...nvz.org
Subject: [PATCH 08/16] fuse: Flush files on wb close -v2

From: Pavel Emelyanov <xemul@...nvz.org>

Any write request requires a file handle to report to the userspace. Thus
when we close a file (and free the fuse_file with this info) we have to
flush all the outstanding dirty pages.

filemap_write_and_wait() is enough because every page under fuse writeback
is accounted in ff->count. This delays actual close until all fuse wb is
completed.

In case of "write cache" turned off, the flush is ensured by fuse_vma_close().

Changed in v2:
 - updated patch to be applied smoothly on top of
   "Trust kernel i_mtime only -v2".

Signed-off-by: Maxim Patlasov <MPatlasov@...allels.com>
---
 fs/fuse/file.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 09a9eeb..3778de1 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -291,6 +291,12 @@ static int fuse_open(struct inode *inode, struct file *file)
 
 static int fuse_release(struct inode *inode, struct file *file)
 {
+	struct fuse_conn *fc = get_fuse_conn(inode);
+
+	/* see fuse_vma_close() for !writeback_cache case */
+	if (fc->writeback_cache)
+		filemap_write_and_wait(file->f_mapping);
+
 	if (test_bit(FUSE_I_MTIME_DIRTY, &get_fuse_inode(inode)->state))
 		fuse_flush_mtime(file, true);
 

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