Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752696Ab1ESKQE (ORCPT ); Thu, 19 May 2011 06:16:04 -0400 Received: from merlot.office.isoc.org.il ([192.115.211.194]:36721 "EHLO merlot.office.isoc.org.il" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751323Ab1ESKQC (ORCPT ); Thu, 19 May 2011 06:16:02 -0400 X-Greylist: delayed 1835 seconds by postgrey-1.27 at vger.kernel.org; Thu, 19 May 2011 06:16:01 EDT Date: Thu, 19 May 2011 12:45:24 +0300 From: Emil Natan To: linux-kernel@vger.kernel.org Subject: Problem: df on tmpfs not reported correctly when filesystem is full Message-ID: <20110519094524.GA7516@isoc.org.il> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.2.2i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3880 Lines: 108 Hi, The problem seems to have been introduced in version linux-2.6.36 and up, it works well in 2.6.35.13. When tmpfs filesystem is full, in the output of df command the "Used", "Available" and "Use%" the numbers are replaced with hyphens: # df /images/1 Filesystem 1K-blocks Used Available Use% Mounted on tmpfs 1024 - - - /images/1 Here is how it looks with "good" and "bad" kernel and how to reproduce the issue. Please let me know if more debug information is needed in a mail cc-ied directly to me. bad: kernel version 2.6.36.4 # ./kernels/linux-2.6.36.4/scripts/ver_linux If some fields are empty or look unusual you may have an old version. Compare to the current minimal requirements in Documentation/Changes. Linux xxx 2.6.36.4 #1 SMP Wed May 18 16:52:45 IDT 2011 i686 GNU/Linux Gnu C 4.4.5 Gnu make 3.81 binutils 2.20.1 util-linux 2.17.2 mount support module-init-tools 3.12 e2fsprogs 1.41.12 Linux C Library 2.11.2 Dynamic linker (ldd) 2.11.2 Procps 3.2.8 Net-tools 1.60 Kbd 1.15.2 Sh-utils 8.5 Modules Loaded ipmi_devintf ipmi_si ipmi_msghandler ipv6 loop hpwdt pcspkr psmouse joydev evdev serio_raw ext3 jbd mbcache sg sr_mod cdrom usbhid uhci_hcd ata_piix libata ehci_hcd hpsa scsi_mod usbcore bnx2 cciss # mount -t tmpfs -o size=1m tmpfs /images/1 # dd if=/dev/zero of=/images/1/file bs=1k count=1017 1017+0 records in 1017+0 records out 1041408 bytes (1.0 MB) copied, 0.00164136 s, 634 MB/s # df /images/1 Filesystem 1K-blocks Used Available Use% Mounted on tmpfs 1024 - - - /images/1 # > /images/1/file # df /images/1 Filesystem 1K-blocks Used Available Use% Mounted on tmpfs 1024 0 1024 0% /images/1 # dd if=/dev/zero of=/images/1/file bs=1k count=500 500+0 records in 500+0 records out 512000 bytes (512 kB) copied, 0.000784176 s, 653 MB/s # df /images/1 Filesystem 1K-blocks Used Available Use% Mounted on tmpfs 1024 508 516 50% /images/1 good: kervel version 2.6.35.13 #./linux-2.6.35.13/scripts/ver_linux If some fields are empty or look unusual you may have an old version. Compare to the current minimal requirements in Documentation/Changes. Linux xxx 2.6.35.13 #1 SMP Wed May 18 17:07:00 IDT 2011 i686 GNU/Linux Gnu C 4.4.5 Gnu make 3.81 binutils 2.20.1 util-linux 2.17.2 mount support module-init-tools 3.12 e2fsprogs 1.41.12 Linux C Library 2.11.2 Dynamic linker (ldd) 2.11.2 Procps 3.2.8 Net-tools 1.60 Kbd 1.15.2 Sh-utils 8.5 Modules Loaded ipmi_devintf ipmi_si ipmi_msghandler ipv6 loop pcspkr hpwdt psmouse serio_raw joydev evdev ext3 jbd mbcache sg sr_mod cdrom usbhid ata_piix libata hpsa uhci_hcd scsi_mod ehci_hcd usbcore bnx2 cciss #mount -t tmpfs -o size=1m tmpfs /images/1 #dd if=/dev/zero of=/images/1/file bs=1k count=1017 dd: writing `/images/1/file': No space left on device 1017+0 records in 1016+0 records out 1040384 bytes (1.0 MB) copied, 0.00173007 s, 601 MB/s #df /images/1 Filesystem 1K-blocks Used Available Use% Mounted on tmpfs 1024 1024 0 100% /images/1 Regards, -- Emil Natan Technical Officer Israel Internet Association (ISOC-IL) Phone: +972 3 9700900 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/