linux-kernel - [PATCH] fuse: fsync() did not return IO errors

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Message-ID: <20160719194713.10551.45137.stgit@maxim-thinkpad>
Date:	Tue, 19 Jul 2016 12:48:01 -0700
From:	Maxim Patlasov <mpatlasov@...tuozzo.com>
To:	<miklos@...redi.hu>
CC:	<linux-fsdevel@...r.kernel.org>,
	<fuse-devel@...ts.sourceforge.net>, <devel@...nvz.org>,
	<linux-kernel@...r.kernel.org>, <kuznet@...tuozzo.com>
Subject: [PATCH] fuse: fsync() did not return IO errors

From: Alexey Kuznetsov <kuznet@...allels.com>

Due to implementation of fuse writeback filemap_write_and_wait_range()
does not catch errors. We have to do this directly after fuse_sync_writes()

Signed-off-by: Alexey Kuznetsov <kuznet@...tuozzo.com>
Signed-off-by: Maxim Patlasov <mpatlasov@...tuozzo.com>
---
 fs/fuse/file.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 9154f86..ad1da83 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -462,6 +462,21 @@ int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
 		goto out;
 
 	fuse_sync_writes(inode);
+
+	/*
+	 * Due to implementation of fuse writeback
+	 * filemap_write_and_wait_range() does not catch errors.
+	 * We have to do this directly after fuse_sync_writes()
+	 */
+	if (test_bit(AS_ENOSPC, &file->f_mapping->flags) &&
+	    test_and_clear_bit(AS_ENOSPC, &file->f_mapping->flags))
+		err = -ENOSPC;
+	if (test_bit(AS_EIO, &file->f_mapping->flags) &&
+	    test_and_clear_bit(AS_EIO, &file->f_mapping->flags))
+		err = -EIO;
+	if (err)
+		goto out;
+
 	err = sync_inode_metadata(inode, 1);
 	if (err)
 		goto out;