Patch "fuse: fuse_flush must check mapping->flags for errors" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    fuse: fuse_flush must check mapping->flags for errors

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     fuse-fuse_flush-must-check-mapping-flags-for-errors.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 9ebce595f63a407c5cec98f98f9da8459b73740a Mon Sep 17 00:00:00 2001
From: Maxim Patlasov <mpatlasov@virtuozzo.com>
Date: Tue, 19 Jul 2016 18:12:26 -0700
Subject: fuse: fuse_flush must check mapping->flags for errors

From: Maxim Patlasov <mpatlasov@virtuozzo.com>

commit 9ebce595f63a407c5cec98f98f9da8459b73740a upstream.

fuse_flush() calls write_inode_now() that triggers writeback, but actual
writeback will happen later, on fuse_sync_writes(). If an error happens,
fuse_writepage_end() will set error bit in mapping->flags. So, we have to
check mapping->flags after fuse_sync_writes().

Signed-off-by: Maxim Patlasov <mpatlasov@virtuozzo.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: 4d99ff8f12eb ("fuse: Turn writeback cache on")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/fuse/file.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -417,6 +417,15 @@ static int fuse_flush(struct file *file,
 	fuse_sync_writes(inode);
 	mutex_unlock(&inode->i_mutex);
 
+	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)
+		return err;
+
 	req = fuse_get_req_nofail_nopages(fc, file);
 	memset(&inarg, 0, sizeof(inarg));
 	inarg.fh = ff->fh;


Patches currently in stable-queue which might be from mpatlasov@virtuozzo.com are

queue-4.4/fuse-fsync-did-not-return-io-errors.patch
queue-4.4/fuse-fuse_flush-must-check-mapping-flags-for-errors.patch