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(1)

Re: [fuse-devel] fuse-2.6.0-rc3 on arm, ls /mnt/fuse hangs the console

From: Jingsong Fu <jfu@ma...> - 2006-10-23 17:33

Attached is the strace output file, from=20
"strace -f -o /var/strace hello /mnt/fuse &"

Thanks,
Jingsong

-----Original Message-----
From: Miklos Szeredi [mailto:miklos@...
Sent: Sunday, October 22, 2006 1:31 PM
To: Jingsong Fu
Cc: fuse-devel@...
Subject: Re: fuse-2.6.0-rc3 on arm, ls /mnt/fuse hangs the console
Importance: Low

> I have tried fuse-2.6.0-rc3, and still have one issue.
> =20
> hello /mnt/fuse=20
> ls /mnt/fuse
> the console hangs.
>=20
> However with "hello /mnt/fuse -s" or "hello /mnt/fuse -d", then "ls
> /mnt/fuse" works.

I have no idea what this could be.  Do you have a working 'strace'?
Can you try

   strace -f -o /tmp/strace hello /mnt/fuse

Thanks,
Miklos

Re: [fuse-devel] fuse-2.6.0-rc3 on arm, ls /mnt/fuse hangs the console

From: Miklos Szeredi <miklos@sz...> - 2006-10-23 17:44

> Attached is the strace output file, from 
> "strace -f -o /var/strace hello /mnt/fuse &"

[...]

> 214   readlink("/mnt", 0xbe9bfc24, 4095) = -1 EINVAL (Invalid argument)
> 214   readlink("/mnt/fuse", 0xbe9bfc24, 4095) = -1 EINVAL (Invalid argument)
> 214   socketpair(PF_FILE, SOCK_STREAM, 0, [4, 5]) = 0
> 214   fork()                            = 215
> 214   close(4)                          = 0
> 214   recvmsg(5, {msg_name(0)=NULL, msg_iov(1)=[{"\0", 1}], msg_controllen=16, {cmsg_len=16, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, {4}}, msg_flags=0}, 0) = 1
> 214   close(5)                          = 0
> 214   wait4(215,

Looks like strace doesn't follow the fork, even though the fork (and
it seems fusermount as well) suceeds.

I still don't know why this is, one thing you could try is commenting
out the following line in include/config.h:

/* Define to 1 if you have the `fork' function. */
#define HAVE_FORK 1

Thanks,
Miklos

Re: [fuse-devel] fuse-2.6.0-rc3 on arm, ls /mnt/fuse hangs the console

From: Jingsong Fu <jfu@ma...> - 2006-10-23 18:19

No behavior change(still hangs) after I commented out //#define
HAVE_FORK 1 in include/config.h, make clean/make, and reloaded hello and
fusermount.

Thanks,
Jingsong

-----Original Message-----
From: Miklos Szeredi [mailto:miklos@...
Sent: Monday, October 23, 2006 10:44 AM
To: Jingsong Fu
Cc: fuse-devel@...
Subject: Re: [fuse-devel] fuse-2.6.0-rc3 on arm,ls /mnt/fuse hangs the
console

> Attached is the strace output file, from=20
> "strace -f -o /var/strace hello /mnt/fuse &"

[...]

> 214   readlink("/mnt", 0xbe9bfc24, 4095) =3D -1 EINVAL (Invalid
argument)
> 214   readlink("/mnt/fuse", 0xbe9bfc24, 4095) =3D -1 EINVAL (Invalid
argument)
> 214   socketpair(PF_FILE, SOCK_STREAM, 0, [4, 5]) =3D 0
> 214   fork()                            =3D 215
> 214   close(4)                          =3D 0
> 214   recvmsg(5, {msg_name(0)=3DNULL, msg_iov(1)=3D[{"\0", 1}],
msg_controllen=3D16, {cmsg_len=3D16, cmsg_level=3DSOL_SOCKET,
cmsg_type=3DSCM_RIGHTS, {4}}, msg_flags=3D0}, 0) =3D 1
> 214   close(5)                          =3D 0
> 214   wait4(215,

Looks like strace doesn't follow the fork, even though the fork (and
it seems fusermount as well) suceeds.

I still don't know why this is, one thing you could try is commenting
out the following line in include/config.h:

/* Define to 1 if you have the `fork' function. */
#define HAVE_FORK 1

Thanks,
Miklos

Re: [fuse-devel] fuse-2.6.0-rc3 on arm, ls /mnt/fuse hangs the console

From: Miklos Szeredi <miklos@sz...> - 2006-10-23 20:05

> No behavior change(still hangs) after I commented out //#define
> HAVE_FORK 1 in include/config.h, make clean/make, and reloaded hello and
> fusermount.

How about libfuse?  The code in question is in the fuse library.

Can you repeat the strace with the new code?

Thanks,
Miklos

Re: [fuse-devel] fuse-2.6.0-rc3 on arm, ls /mnt/fuse hangs the console

From: Jingsong Fu <jfu@ma...> - 2006-10-23 20:36

I am using --enable-shared=3Dno, so libfuse is statically linked.=20
It seems fusermount was not finished this time, see the ps as follows,
 >ps=20
  ......
  206 root        316 S   /sbin/klogd -n
  223 root        396 S   strace -f -o /var/strace.log10 hello /mnt/fuse
  224 root        296 T   hello /mnt/fuse
  225 root            Z   [fusermount]

Starce output file attached.

Thanks,
Jingsong

-----Original Message-----
From: Miklos Szeredi [mailto:miklos@...
Sent: Monday, October 23, 2006 1:05 PM
To: Jingsong Fu
Cc: fuse-devel@...
Subject: Re: [fuse-devel] fuse-2.6.0-rc3 on arm,ls /mnt/fuse hangs the
console
Importance: Low

> No behavior change(still hangs) after I commented out //#define
> HAVE_FORK 1 in include/config.h, make clean/make, and reloaded hello
and
> fusermount.

How about libfuse?  The code in question is in the fuse library.

Can you repeat the strace with the new code?

Thanks,
Miklos

Re: [fuse-devel] fuse-2.6.0-rc3 on arm, ls /mnt/fuse hangs the console

From: Jingsong Fu <jfu@ma...> - 2006-10-23 20:55

More info:=20
when "ls /mnt/fuse &" was issued,=20

# ls /mnt/fuse &gotls /mnt/fuse &

 unknown 21:
/0x40/0x70/0x73/0x08/0x08/0x08/0x08/0x6c/0x73/0x20/0x2f/0x6d/0x6e/0x74/0
x2f/0x66

# got

 unknown 0:
/0x00/0x70/0x73/0x08/0x08/0x08/0x08/0x6c/0x73/0x20/0x2f/0x6d/0x6e/0x74/0
x2f/0x66
------------
I tried to dump the kernel stack,
the following is the ls's stack trace, it seemed ls was trying to get a
request, and got stalled.
----> ls            S C0204848     0   242    204
(NOTLB)

stack:[<c0204300>] (schedule+0x0/0x66c) from [<bf000240>]
(fuse_get_req+0xd0/0x160 [fuse])
[<bf000170>] (fuse_get_req+0x0/0x160 [fuse]) from [<bf0031c4>]
(fuse_do_getattr+0x24/0xd8 [fuse])
[<bf0031a0>] (fuse_do_getattr+0x0/0xd8 [fuse]) from [<bf003bc8>]
(fuse_getattr+0x80/0x9c [fuse])
 r9 =3D C0E3E000  r8 =3D BF003B48  r7 =3D C0E3FF4C  r6 =3D C0E3FF4C
 r5 =3D C0F78E60  r4 =3D C0F78E60
[<bf003b48>] (fuse_getattr+0x0/0x9c [fuse]) from [<c007fbf4>]
(vfs_getattr+0x2c/0x94)
 r6 =3D BEAA6EC3  r5 =3D C0F78E60  r4 =3D 00000000
[<c007fbc8>] (vfs_getattr+0x0/0x94) from [<c007fd0c>]
(vfs_lstat_fd+0x3c/0x54)
 r8 =3D C0021164  r7 =3D 000000C4  r6 =3D BEAA6EC3  r5 =3D C0E3FEE0
 r4 =3D 00000000
[<c007fcd0>] (vfs_lstat_fd+0x0/0x54) from [<c007fd40>]
(vfs_lstat+0x1c/0x20)
 r5 =3D C0E3FF4C  r4 =3D BEAA6C3C
[<c007fd24>] (vfs_lstat+0x0/0x20) from [<c0080318>]
(sys_lstat64+0x20/0x44)
[<c00802f8>] (sys_lstat64+0x0/0x44) from [<c0020fc0>]
(ret_fast_syscall+0x0/0x2c)
 r5 =3D BEAA6EC3  r4 =3D 00000000

-----Original Message-----
From: Jingsong Fu=20
Sent: Monday, October 23, 2006 1:35 PM
To: 'Miklos Szeredi'
Cc: fuse-devel@...
Subject: RE: [fuse-devel] fuse-2.6.0-rc3 on arm,ls /mnt/fuse hangs the
console

I am using --enable-shared=3Dno, so libfuse is statically linked.=20
It seems fusermount was not finished this time, see the ps as follows,
 >ps=20
  ......
  206 root        316 S   /sbin/klogd -n
  223 root        396 S   strace -f -o /var/strace.log10 hello /mnt/fuse
  224 root        296 T   hello /mnt/fuse
  225 root            Z   [fusermount]

Starce output file attached.

Thanks,
Jingsong

-----Original Message-----
From: Miklos Szeredi [mailto:miklos@...
Sent: Monday, October 23, 2006 1:05 PM
To: Jingsong Fu
Cc: fuse-devel@...
Subject: Re: [fuse-devel] fuse-2.6.0-rc3 on arm,ls /mnt/fuse hangs the
console
Importance: Low

> No behavior change(still hangs) after I commented out //#define
> HAVE_FORK 1 in include/config.h, make clean/make, and reloaded hello
and
> fusermount.

How about libfuse?  The code in question is in the fuse library.

Can you repeat the strace with the new code?

Thanks,
Miklos

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Re: [fuse-devel] mmap not working with fuse 2.6.0rc3

From: <getaceres@gm...> - 2006-10-23 10:05

Hello, I've found the forbidding code in file.c in the function
fuse_file_mmap. As I'm having a real filesystem as backend, I know the
file size of every file in every moment so I don't know if it's safe
for me to remove the

if ((vma->vm_flags & VM_SHARED)) {
=09=09if ((vma->vm_flags & VM_WRITE))
=09=09=09return -ENODEV;
=09=09else
=09=09=09vma->vm_flags &=3D ~VM_MAYWRITE;
=09}

lines so shared writable mmaps are permited. What's the reason it's forbidd=
en?

On 10/20/06, Miklos Szeredi <miklos@...> wrote:
> > I'm not using direct_io neither in the mount options or the open
> > operation so it must be a shared writable mapping.
> > So definitely, apt cannot execute in a fuse filesystem, isn't it?
>
> Yup.  I'll work on making writable mappings work after the 2.6.0
> release.
>
> Miklos
>

--=20
Saludos.
Jos=E9 Antonio S=E1nchez

Re: [fuse-devel] mmap not working with fuse 2.6.0rc3

From: Vincenzo Ciancia <ciancia@di...> - 2006-10-23 14:05

Il giorno lun, 23/10/2006 alle 12.04 +0200, Jos=C3=A9 Antonio S=C3=A1nchez =
ha
scritto:
> Hello, I've found the forbidding code in file.c in the function
> fuse_file_mmap. As I'm having a real filesystem as backend, I know the
> file size of every file in every moment so I don't know if it's safe
> for me to remove the
>=20
> if ((vma->vm_flags & VM_SHARED)) {
> 		if ((vma->vm_flags & VM_WRITE))
> 			return -ENODEV;
> 		else
> 			vma->vm_flags &=3D ~VM_MAYWRITE;
> 	}
>=20
> lines so shared writable mmaps are permited. What's the reason it's forbi=
dden?

That's part of the history of fuse I think :) see for example
=20
http://lwn.net/Articles/112396/

bye

Vincenzo

Re: [fuse-devel] FUSE performance

From: Nicolas Collignon <tsointsoin@gm...> - 2006-10-23 01:56

>         - kernel/userspace context switches
It's possible to save 1 task switch by using a ioctl for user <-->
kernel communication
instead of read + write.

>         - bulk memory copying (more than without FUSE)
It should be possible to use only readv/writev instead of read/write
for large file operations.

my 2 cents...

-- 
Person who say it cannot be done should not interrupt person doing it.