linux-kernel - PROBLEM: FUSE unmount breaks serial terminal line

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Message-ID: <20060820180505.GA18283@sommrey.de>
Date:	Sun, 20 Aug 2006 20:05:05 +0200
From:	Joerg Sommrey <jo@...mrey.de>
To:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: PROBLEM: FUSE unmount breaks serial terminal line

Hello,

something in FUSE breaks serial devices.  I found this issue 
using gphotofs, don't know if any other FUSE impementation has similar
effects.  The problem is: from the moment the FUSE filesystem is unmounted,
a process that read()s on a serial device /dev/ttyS? gets an EOF
returncode.  

Here is the tail of the output from "strace -tt cat /dev/ttyS0" when the
FUSE fs was unmounted:

19:41:46.513143 open("/dev/ttyS0", O_RDONLY|O_LARGEFILE) = 3
19:41:46.513373 fstat64(3, {st_mode=S_IFCHR|0660, st_rdev=makedev(4, 64), ...}) = 0
19:41:46.513552 read(3, "", 4096)       = 0
19:42:49.854367 close(3)                = 0
19:42:49.860663 close(1)                = 0
19:42:49.860793 exit_group(0)           = ?

Found this on x86 with kernels 2.6.16 and 2.6.17.

Any ideas?

-jo

-- 
-rw-r--r-- 1 jo users 62 2006-08-20 14:06 /home/jo/.signature
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