nilfs_cleanerd on root partition

nilfs_cleanerd on root partition

[James Erickson]

i am new to nilfs2 so i am sorry to ask such a simple question. how do i
get nilfs_cleanerd to run on my root partition? my disk is a 64 GB intel
ssd and it is completely full of checkpoints. my system is originally 4
GB in size. it is gentoo amd64 running linux-2.6.30-gentoo-r1. it has
nilfs2 support compiled in the kernel, not as a module. i thought that
nilfs_cleanerd would run when the root patition is mounted but i guess i
was wrong. i will gladly post any requested data. thank you for any help
you can offer in this matter.

Re: nilfs_cleanerd on root partition

[Ryusuke Konishi]

Hi,
On Sat, 20 Jun 2009 16:19:39 -0500, James Erickson wrote:
> i am new to nilfs2 so i am sorry to ask such a simple question. how
> do i get nilfs_cleanerd to run on my root partition? my disk is a 64
> GB intel ssd and it is completely full of checkpoints. my system is
> originally 4 GB in size. it is gentoo amd64 running
> linux-2.6.30-gentoo-r1. it has nilfs2 support compiled in the
> kernel, not as a module. i thought that nilfs_cleanerd would run
> when the root patition is mounted but i guess i was wrong. i will
> gladly post any requested data. thank you for any help you can offer
> in this matter.

nilfs_cleanerd is invoked when the partition is mounted, but sleeps if
no reclaimable data exists.

Is there nilfs_cleanerd process ?

 $ ps aux | grep nilfs_cleanerd

If it exists, please try decreasing the protection period in
/etc/nilfs_cleanerd.conf.  Nilfs tries to preserve all past data
within the period.

 $ sudo vi /etc/nilfs_cleanred.conf

  # Protection period in second
- protection_period   3600
+ protection_period   300

After changed the conf file, you must send a HUP signal to the cleaner
daemon in order to reflect the change.

 $ mount -t nilfs2
 /dev/sdb1 on / type nilfs2 (rw,gcpid=14126)
 $ sudo kill -HUP 14126

Then, it will start working to make free space.


If the cleanerd did not exist, you can invoke it by hand.

 # nilfs_cleanerd /dev/sdb1 /

In this case, you also have to shutdown it by hand.

Cheers,
Ryusuke Konishi

Re: nilfs_cleanerd on root partition

[Sami Liedes]

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On Sun, Jun 21, 2009 at 06:39:37PM +0900, Ryusuke Konishi wrote:
> nilfs_cleanerd is invoked when the partition is mounted, but sleeps if
> no reclaimable data exists.
> 
> Is there nilfs_cleanerd process ?
> 
>  $ ps aux | grep nilfs_cleanerd
[...]
> If the cleanerd did not exist, you can invoke it by hand.
> 
>  # nilfs_cleanerd /dev/sdb1 /

Hmm, for me, nilfs_cleanerd does not start with such a command (either
from mount or by hand).

I *think* I might know what the problem is. The nilfs2-tools in Debian
unstable is 2.0.12, while the version of nilfs2 in 2.6.30 is .14
unless I'm mistaken.

In any case I'd be very happy to get some error messages visible
somewhere; mount failed silently to start nilfs_cleanerd, even
starting nilfs_cleanerd by hand doesn't output anything to indicate it
did not succeed, and there's nothing in dmesg about that either. The
only indication there's something wrong, if you know to look, is the
message

   "cannot create cleanerd on /dev/mapper/lacie"

in /var/log/daemon.log and the fact that cleanerd is not running.

	Sami

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Re: nilfs_cleanerd on root partition

[Sami Liedes]

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On Sun, Jun 21, 2009 at 04:44:19PM +0300, Sami Liedes wrote:
> I *think* I might know what the problem is. The nilfs2-tools in Debian
> unstable is 2.0.12, while the version of nilfs2 in 2.6.30 is .14
> unless I'm mistaken.

Never mind, I just realized 2.0.12 is the latest -tools.

You say I should start the cleanerd by running

 # nilfs_cleanerd /dev/sdb1 /

However nothing in the output of `nilfs_cleanerd -h' indicates
anything of the second parameter (mount point). Looking at the source,
that's how mount.nilfs2 runs it too, and that's exactly the case where
it fails.

Running merely `nilfs_cleanerd /dev/mapper/lacie', as per the
nilfs_cleanerd -h output, succeeds (but I don't know if it does the
right thing). When I (or mount) gives the mount point as a second
parameter, it fails fairly silently. I only get this in
/var/log/daemon.log:

When started by mount.nilfs2:

------------------------------------------------------------
Jun 20 20:34:28 lh nilfs_cleanerd[27527]: start
Jun 20 20:34:28 lh nilfs_cleanerd[27527]: cannot create cleanerd on /dev/mapper/lacie
Jun 20 20:34:28 lh nilfs_cleanerd[27527]: shutdown
------------------------------------------------------------

When started manually by running `nilfs_cleanerd /dev/mapper/lacie
/media/lacie' (the mount point):

------------------------------------------------------------
Jun 21 16:12:04 lh nilfs_cleanerd[2573]: start
Jun 21 16:12:04 lh nilfs_cleanerd[2573]: cannot create cleanerd on /dev/mapper/lacie
Jun 21 16:12:04 lh nilfs_cleanerd[2573]: shutdown
------------------------------------------------------------

	Sami

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Re: nilfs_cleanerd on root partition

[Sami Liedes]

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On Sun, Jun 21, 2009 at 05:02:34PM +0300, Sami Liedes wrote:
> You say I should start the cleanerd by running
> 
>  # nilfs_cleanerd /dev/sdb1 /
> 
> However nothing in the output of `nilfs_cleanerd -h' indicates
> anything of the second parameter (mount point). Looking at the source,
> that's how mount.nilfs2 runs it too, and that's exactly the case where
> it fails.

OK, I debugged a bit and figured out what the real problem is. It's
the fact that nilfs_find_fs() is too strict about the mount points
being the same. Namely, it considers /media/lacie and /media/lacie/ to
be different mount points (it merely does a strcmp()).

/proc/mounts always uses the former syntax, so if the mount command is
something like `mount /dev/mapper/lacie /media/lacie/ -t nilfs2', the
cleanerd is not started because mount passes "/media/lacie/" as the
mount point, and nilfs_find_fs() expects it to not have the last
slash.

	Sami

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Re: nilfs_cleanerd on root partition

[Ryusuke Konishi]

Hi,
On Sun, 21 Jun 2009 17:37:08 +0300, Sami Liedes wrote:
> On Sun, Jun 21, 2009 at 05:02:34PM +0300, Sami Liedes wrote:
> > You say I should start the cleanerd by running
> > 
> >  # nilfs_cleanerd /dev/sdb1 /
> > 
> > However nothing in the output of `nilfs_cleanerd -h' indicates
> > anything of the second parameter (mount point). Looking at the source,
> > that's how mount.nilfs2 runs it too, and that's exactly the case where
> > it fails.
> 
> OK, I debugged a bit and figured out what the real problem is. It's
> the fact that nilfs_find_fs() is too strict about the mount points
> being the same. Namely, it considers /media/lacie and /media/lacie/ to
> be different mount points (it merely does a strcmp()).
>
> /proc/mounts always uses the former syntax, so if the mount command is
> something like `mount /dev/mapper/lacie /media/lacie/ -t nilfs2', the
> cleanerd is not started because mount passes "/media/lacie/" as the
> mount point, and nilfs_find_fs() expects it to not have the last
> slash.
> 
> 	Sami

Grr, that's an elementary and influential bug.  Okay, I'll fix it.

Sami, thank you for finding this!

Cheers,
Ryusuke Konishi

Re: nilfs_cleanerd on root partition

[Ryusuke Konishi]

On Mon, 22 Jun 2009 01:05:10 +0900 (JST), Ryusuke Konishi wrote:
> Hi,
> On Sun, 21 Jun 2009 17:37:08 +0300, Sami Liedes wrote:
> > On Sun, Jun 21, 2009 at 05:02:34PM +0300, Sami Liedes wrote:
> > > You say I should start the cleanerd by running
> > > 
> > >  # nilfs_cleanerd /dev/sdb1 /
> > > 
> > > However nothing in the output of `nilfs_cleanerd -h' indicates
> > > anything of the second parameter (mount point). Looking at the source,
> > > that's how mount.nilfs2 runs it too, and that's exactly the case where
> > > it fails.
> > 
> > OK, I debugged a bit and figured out what the real problem is. It's
> > the fact that nilfs_find_fs() is too strict about the mount points
> > being the same. Namely, it considers /media/lacie and /media/lacie/ to
> > be different mount points (it merely does a strcmp()).
> >
> > /proc/mounts always uses the former syntax, so if the mount command is
> > something like `mount /dev/mapper/lacie /media/lacie/ -t nilfs2', the
> > cleanerd is not started because mount passes "/media/lacie/" as the
> > mount point, and nilfs_find_fs() expects it to not have the last
> > slash.
> > 
> > 	Sami
> 
> Grr, that's an elementary and influential bug.  Okay, I'll fix it.
> 
> Sami, thank you for finding this!
> 
> Cheers,
> Ryusuke Konishi

The following patch will fix this.  I've pushed it to the git repo,
too.

Regards,
Ryusuke Konishi
---
 lib/nilfs.c |   29 +++++++++++++++++++++++++----
 1 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/lib/nilfs.c b/lib/nilfs.c
index 15ee98f..9c80538 100644
--- a/lib/nilfs.c
+++ b/lib/nilfs.c
@@ -147,14 +147,27 @@ static int nilfs_find_fs(struct nilfs *nilfs, const char *dev, const char *dir,
 	size_t len;
 	int ret, n;
 	char canonical[PATH_MAX + 2];
+	char *cdev = NULL, *cdir = NULL;
 
-	if (dev && myrealpath(dev, canonical, sizeof(canonical)))
-		dev = canonical;
+	ret = -1;
+	if (dev && myrealpath(dev, canonical, sizeof(canonical))) {
+		cdev = strdup(canonical);
+		if (!cdev)
+			goto failed;
+		dev = cdev;
+	}
+
+	if (dir && myrealpath(dir, canonical, sizeof(canonical))) {
+		cdir = strdup(canonical);
+		if (!cdir)
+			goto failed_dev;
+		dir = cdir;
+	}
 
 	fp = fopen(PROCMOUNTS, "r");
 	if (fp == NULL)
-		return -1;
-	ret = -1;
+		goto failed_dir;
+
 	while (fgets(line, sizeof(line), fp) != NULL) {
 		n = tokenize(line, mntent, NMNTFLDS);
 		assert(n == NMNTFLDS);
@@ -181,6 +194,14 @@ static int nilfs_find_fs(struct nilfs *nilfs, const char *dev, const char *dir,
 		}
 	}
 	fclose(fp);
+
+ failed_dir:
+	free(cdir);
+
+ failed_dev:
+	free(cdev);
+
+ failed:
 	return ret;
 }
 
-- 
1.6.2

Re: nilfs_cleanerd won't run on root

[Jiro SEKIBA]

Hi, Andrew

Which distribution are you using?
What version of kernel and nilfs module are in the distro?
How is your /proc/mounts like?

It looks like you are using a bit older version.
Older version of nilfs2-utils had the similar problem,
but latest version would not have the issue.

regards,
-- 
Jiro SEKIBA <jir-hfpbi5WX9J54Eiagz67IpQ@public.gmane.org>

At Thu, 05 Nov 2009 17:41:00 +0000,
Andrew Benton wrote:
> 
> Hello world,
> I've installed linux on a 10gb nilfs2 root partition /dev/sda2. When I
> boot into it nilfs_cleanerd won't run
> 
> root:/home/andy# ps aux | grep nilfs_cleanerd
> root      1497  0.0  0.0   5456   592 pts/0    S+   17:18   0:00 grep nilfs_cleanerd
> 
> If I start nilfs_cleanerd with a command it quits with no error message
> at the command prompt but it leaves this in the system log
> 
> Nov  5 17:18:05 eccles nilfs_cleanerd[1495]: start
> Nov  5 17:18:05 eccles nilfs_cleanerd[1495]: cannot open nilfs on (null): No such file or directory
> Nov  5 17:18:05 eccles nilfs_cleanerd[1495]: cannot create cleanerd on (null): No such file or directory
> Nov  5 17:18:05 eccles nilfs_cleanerd[1495]: shutdown
> 
> If I pass it different options the only thing that changes is the error it dumps in the system log
> 
> root:/home/andy# nilfs_cleanerd /
> 
> Nov  5 17:19:02 eccles nilfs_cleanerd[1503]: start
> Nov  5 17:19:02 eccles nilfs_cleanerd[1503]: cannot open nilfs on /: Inappropriate ioctl for device
> Nov  5 17:19:02 eccles nilfs_cleanerd[1503]: cannot create cleanerd on /: Inappropriate ioctl for device
> Nov  5 17:19:02 eccles nilfs_cleanerd[1503]: shutdown
> 
> root:/home/andy# nilfs_cleanerd /dev/sda2
> 
> Nov  5 17:19:26 eccles nilfs_cleanerd[1505]: start
> Nov  5 17:19:26 eccles nilfs_cleanerd[1505]: cannot open nilfs on /dev/sda2: No such file or directory
> Nov  5 17:19:26 eccles nilfs_cleanerd[1505]: cannot create cleanerd on /dev/sda2: No such file or directory
> Nov  5 17:19:26 eccles nilfs_cleanerd[1505]: shutdown
> 
> root:/home/andy# cat /etc/mtab
> /dev/sda2 / nilfs2 rw,gcpid=1292 0 0
> proc /proc proc rw 0 0
> sysfs /sys sysfs rw 0 0
> devpts /dev/pts devpts rw,gid=4,mode=620 0 0
> shm /dev/shm tmpfs rw 0 0
> /dev/sda1 /mnt/windows ntfs rw,umask=0 0 0
> /dev/sda7 /home reiserfs rw 0 0
> /dev/sda3 /mnt/lfs btrfs rw 0 0
> 
> The only way I can get garbage collection to run is if I reboot into
> a different partition and mount it from there.
> 
> Andrew Benton
> _______________________________________________
> users mailing list
> users-JrjvKiOkagjYtjvyW6yDsg@public.gmane.org
> https://www.nilfs.org/mailman/listinfo/users
> 
> 
> 

Re: nilfs_cleanerd won't run on root

[Andrew Benton]

On 06/11/09 05:41, Jiro SEKIBA wrote:
> Hi, Andrew
>
> Which distribution are you using?
> What version of kernel and nilfs module are in the distro?
> How is your /proc/mounts like?
>
> It looks like you are using a bit older version.
> Older version of nilfs2-utils had the similar problem,
> but latest version would not have the issue.
>

I'm using nilfs-utils-2.0.14. The kernel is a vanilla 2.6.31.4 self
compiled with no modules (everything compiled in). The system is self
compiled (based on Linux From Scratch).
/proc/mounts is a symbolic link pointing at /proc/self/mounts.
/proc/self is a symbolic link pointing at /proc/1511 so /proc/mounts is
actually pointing at /proc/1511/mounts

andy:~$ cat /proc/mounts
rootfs / rootfs rw 0 0
/dev/root / nilfs2 rw,relatime 0 0
proc /proc proc rw,relatime 0 0
sysfs /sys sysfs rw,relatime 0 0
tmpfs /dev tmpfs rw,relatime,mode=755 0 0
devpts /dev/pts devpts rw,relatime,gid=4,mode=620 0 0
shm /dev/shm tmpfs rw,relatime 0 0
/dev/sda1 /mnt/windows ntfs ro,relatime,uid=0,gid=0,umask=00,nls=default,errors=continue,mft_zone_multiplier=1 0 0
/dev/sda7 /home reiserfs rw,relatime 0 0
/dev/sda3 /mnt/lfs btrfs rw,relatime 0 0
andy:~$

Re: nilfs_cleanerd won't run on root

[Andrew Benton]

On 06/11/09 05:41, Jiro SEKIBA wrote:
> How is your /proc/mounts like?

Thanks for your help, that pointed me in the right direction.
/proc/mounts shows the root filesystem as /dev/root, which doesn't
exist. If I make a symbolic link /dev/root pointing at /dev/sda2 then I
can start nilfs_cleanerd.
Now I just need to craft a udev rule to make that symbolic link and 
start nilfs_cleanerd.

Andy

nilfs_cleanerd shutdown

[sh1v4_0h-/E1597aS9LQAvxtiuMwx3w]

When I mount nilfs filesystems, nilfs_cleanerd does something like this:

Jun 21 19:44:06 localhost mount.nilfs2: WARNING! - The NILFS on-disk format may change at any time.
Jun 21 19:44:06 localhost mount.nilfs2: WARNING! - Do not place critical data on a NILFS filesystem.
Jun 21 19:44:07 localhost nilfs_cleanerd[4120]: start
Jun 21 19:44:07 localhost nilfs_cleanerd[4120]: cannot create cleanerd on /dev/mapper/system-root
Jun 21 19:44:07 localhost nilfs_cleanerd[4120]: shutdown


but if I run 'nilfs_cleanerd' without any arguments as root everything works just fine and nilfs_cleanerd seems to find the mounted device automatically and frees space on it:

Jun 21 20:27:50 localhost nilfs_cleanerd[7704]: start

Is there someting I can do so nilfs_cleanerd will work with mount.nilfs2?

Re: nilfs_cleanerd shutdown

[Jiro SEKIBA]

Hi,

At Sun, 21 Jun 2009 12:10:56 -0700 (PDT),
sh1v4_0h-/E1597aS9LQAvxtiuMwx3w@public.gmane.org wrote:

> When I mount nilfs filesystems, nilfs_cleanerd does something like this:
> 
> Jun 21 19:44:06 localhost mount.nilfs2: WARNING! - The NILFS on-disk format may change at any time.
> Jun 21 19:44:06 localhost mount.nilfs2: WARNING! - Do not place critical data on a NILFS filesystem.
> Jun 21 19:44:07 localhost nilfs_cleanerd[4120]: start
> Jun 21 19:44:07 localhost nilfs_cleanerd[4120]: cannot create cleanerd on /dev/mapper/system-root
> Jun 21 19:44:07 localhost nilfs_cleanerd[4120]: shutdown
>
> but if I run 'nilfs_cleanerd' without any arguments as root everything works just fine and nilfs_cleanerd seems to find the mounted device automatically and frees space on it:
> 
> Jun 21 20:27:50 localhost nilfs_cleanerd[7704]: start
> 
> Is there someting I can do so nilfs_cleanerd will work with mount.nilfs2?

I had same problem.

The recent patch against nilfs-utils works find for me and cleanerd now
automaticaly starats when mount the nilfs partition.  It would be worth
for you to apply it.

> Message-Id: <20090622.030037.34127637.ryusuke-sG5X7nlA6pw@public.gmane.org>

or just pull recent git repository.

thanks

regards,
-- 
Jiro SEKIBA <jir-hfpbi5WX9J54Eiagz67IpQ@public.gmane.org>

Re: nilfs_cleanerd on root partition

[Jiro SEKIBA]

Hi,

At Mon, 22 Jun 2009 03:00:37 +0900 (JST),
Ryusuke Konishi wrote:
> 
> On Mon, 22 Jun 2009 01:05:10 +0900 (JST), Ryusuke Konishi wrote:
> > Hi,
> > On Sun, 21 Jun 2009 17:37:08 +0300, Sami Liedes wrote:
> > > On Sun, Jun 21, 2009 at 05:02:34PM +0300, Sami Liedes wrote:
> > > > You say I should start the cleanerd by running
> > > > 
> > > >  # nilfs_cleanerd /dev/sdb1 /
> > > > 
> > > > However nothing in the output of `nilfs_cleanerd -h' indicates
> > > > anything of the second parameter (mount point). Looking at the source,
> > > > that's how mount.nilfs2 runs it too, and that's exactly the case where
> > > > it fails.
> > > 
> > > OK, I debugged a bit and figured out what the real problem is. It's
> > > the fact that nilfs_find_fs() is too strict about the mount points
> > > being the same. Namely, it considers /media/lacie and /media/lacie/ to
> > > be different mount points (it merely does a strcmp()).
> > >
> > > /proc/mounts always uses the former syntax, so if the mount command is
> > > something like `mount /dev/mapper/lacie /media/lacie/ -t nilfs2', the
> > > cleanerd is not started because mount passes "/media/lacie/" as the
> > > mount point, and nilfs_find_fs() expects it to not have the last
> > > slash.
> > > 
> > > 	Sami
> > 
> > Grr, that's an elementary and influential bug.  Okay, I'll fix it.
> > 
> > Sami, thank you for finding this!
> > 
> > Cheers,
> > Ryusuke Konishi
> 
> The following patch will fix this.  I've pushed it to the git repo,
> too.
> 
> Regards,
> Ryusuke Konishi
> ---
>  lib/nilfs.c |   29 +++++++++++++++++++++++++----
>  1 files changed, 25 insertions(+), 4 deletions(-)
> 
> diff --git a/lib/nilfs.c b/lib/nilfs.c
> index 15ee98f..9c80538 100644
> --- a/lib/nilfs.c
> +++ b/lib/nilfs.c
> @@ -147,14 +147,27 @@ static int nilfs_find_fs(struct nilfs *nilfs, const char *dev, const char *dir,
>  	size_t len;
>  	int ret, n;
>  	char canonical[PATH_MAX + 2];
> +	char *cdev = NULL, *cdir = NULL;
>  
> -	if (dev && myrealpath(dev, canonical, sizeof(canonical)))
> -		dev = canonical;
> +	ret = -1;
> +	if (dev && myrealpath(dev, canonical, sizeof(canonical))) {
> +		cdev = strdup(canonical);
> +		if (!cdev)
> +			goto failed;
> +		dev = cdev;
> +	}
> +
> +	if (dir && myrealpath(dir, canonical, sizeof(canonical))) {
> +		cdir = strdup(canonical);
> +		if (!cdir)
> +			goto failed_dev;
> +		dir = cdir;
> +	}
>  
>  	fp = fopen(PROCMOUNTS, "r");
>  	if (fp == NULL)
> -		return -1;
> -	ret = -1;
> +		goto failed_dir;
> +
>  	while (fgets(line, sizeof(line), fp) != NULL) {
>  		n = tokenize(line, mntent, NMNTFLDS);
>  		assert(n == NMNTFLDS);
> @@ -181,6 +194,14 @@ static int nilfs_find_fs(struct nilfs *nilfs, const char *dev, const char *dir,
>  		}
>  	}
>  	fclose(fp);
> +
> + failed_dir:
> +	free(cdir);
> +
> + failed_dev:
> +	free(cdev);
> +
> + failed:
>  	return ret;
>  }
>  
> -- 
> 1.6.2

I've just pull the git repository and it just works fine for me!

thanks!

regards,
-- 
Jiro SEKIBA <jir-hfpbi5WX9J54Eiagz67IpQ@public.gmane.org>

nilfs_cleanerd won't run on root

[Andrew Benton]

Hello world,
I've installed linux on a 10gb nilfs2 root partition /dev/sda2. When I
boot into it nilfs_cleanerd won't run

root:/home/andy# ps aux | grep nilfs_cleanerd
root      1497  0.0  0.0   5456   592 pts/0    S+   17:18   0:00 grep nilfs_cleanerd

If I start nilfs_cleanerd with a command it quits with no error message
at the command prompt but it leaves this in the system log

Nov  5 17:18:05 eccles nilfs_cleanerd[1495]: start
Nov  5 17:18:05 eccles nilfs_cleanerd[1495]: cannot open nilfs on (null): No such file or directory
Nov  5 17:18:05 eccles nilfs_cleanerd[1495]: cannot create cleanerd on (null): No such file or directory
Nov  5 17:18:05 eccles nilfs_cleanerd[1495]: shutdown

If I pass it different options the only thing that changes is the error it dumps in the system log

root:/home/andy# nilfs_cleanerd /

Nov  5 17:19:02 eccles nilfs_cleanerd[1503]: start
Nov  5 17:19:02 eccles nilfs_cleanerd[1503]: cannot open nilfs on /: Inappropriate ioctl for device
Nov  5 17:19:02 eccles nilfs_cleanerd[1503]: cannot create cleanerd on /: Inappropriate ioctl for device
Nov  5 17:19:02 eccles nilfs_cleanerd[1503]: shutdown

root:/home/andy# nilfs_cleanerd /dev/sda2

Nov  5 17:19:26 eccles nilfs_cleanerd[1505]: start
Nov  5 17:19:26 eccles nilfs_cleanerd[1505]: cannot open nilfs on /dev/sda2: No such file or directory
Nov  5 17:19:26 eccles nilfs_cleanerd[1505]: cannot create cleanerd on /dev/sda2: No such file or directory
Nov  5 17:19:26 eccles nilfs_cleanerd[1505]: shutdown

root:/home/andy# cat /etc/mtab
/dev/sda2 / nilfs2 rw,gcpid=1292 0 0
proc /proc proc rw 0 0
sysfs /sys sysfs rw 0 0
devpts /dev/pts devpts rw,gid=4,mode=620 0 0
shm /dev/shm tmpfs rw 0 0
/dev/sda1 /mnt/windows ntfs rw,umask=0 0 0
/dev/sda7 /home reiserfs rw 0 0
/dev/sda3 /mnt/lfs btrfs rw 0 0

The only way I can get garbage collection to run is if I reboot into
a different partition and mount it from there.

Andrew Benton