Title: DM ACADEMY OPEN EVENT
[EMAIL PROTECTED] (Thomas Bushnell, BSG) writes:
> I have a more concrete idea about how to change diskfs into an
> "ordered writes" instead of a "synchronous writes" model. If someone
> prods me, I can explain it.
Please do.
Regards,
/Niels
___
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Ok by me.
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Bug-hurd mailing list
[EMAIL PROTECTED]
http://mail.gnu.org/mailman/listinfo/bug-hurd
> Here is the follow-up patch that allows netfs_make_protid to only set errno
> on failure.
I am not really interested in this patch: I think
netfs_make_{protid,peropen} should, in this regard, be changed to use
similar semantics as their counterparts in libdiskfs, i.e. instead of
returning a p
diskfs_make_peropen is dangerous in the same way that
diskfs_make_protid was: it is too easy to not check the return value.
In fact, there is not one place in the source that we do. This patch
changes that in the same way that we changed diskfs_make_protid last
April, i.e. from:
struct peropen
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[EMAIL PROTECTED] (Niels Möller) writes:
> How hard would it be to create a new store type that basically
> implements only a write-cache: It would have store_write put the
> modified block into a queue, from which blocks are written to the
> underlying store later by a separate syncing thread. s
[EMAIL PROTECTED] (Niels Möller) writes:
> Is it not good enough to maintain the order of the writes, updating
> diskblocks in the same order as the corresponding write by the client?
Yes, that's enough. But you cannot skip any writes.
> One problem is that if the filesystem modifies block A,
On Mon, Mar 25, 2002 at 09:59:14PM +0100, Farid Hajji wrote:
> All in all, binary compatibility is a nice thing to have.
If it's only used for running non-free software I disagree. For free
software you can simply recompile the software. The only really reason
I see is that you can have the same
On Mon, Mar 25, 2002 at 09:53:41PM +0100, Niels Möller wrote:
> One problem is that if the filesystem modifies block A, then block B,
> and then block A again, then you may need to keep this ordering, and
> not merge it as one write to A and one to B. Is the touch-rm-loop of
> this kind? Then I gu
On Tue, Mar 26, 2002 at 11:04:14AM -0700, Jon Arney wrote:
> I understand the goals of having disk syncrhonization performed
> in the proper order to avoid disk inconsistencies. I also,
> however, agree with Adam that something less than "optimal"
> might be better than nothing at all.
We have s
> > might even introduce a security problem. Thus we would need to recompile
> > all programs anyway. I can't see the point of having binary
> > compatiblity then.
>
> If a user just wants to play Quake V or Duke Nukem Forever, he might not
> need to care about PATH_MAX, as these programs will mo
On Mon, Mar 25, 2002 at 09:23:15PM +0100, Oystein Viggen wrote:
> * [Wolfgang J?hrling]
>
> > might even introduce a security problem. Thus we would need to recompile
> > all programs anyway. I can't see the point of having binary
> > compatiblity then.
>
> If a user just wants to play Quake V
Marcus Brinkmann <[EMAIL PROTECTED]> writes:
> Well, if this is possible we could just avoid syncing the blocks back to the
> store in the filesystem in the first place. Thomas' point is exactly that
> to make the expected guarantees you can not cache the writes in any
> simplistic fashion: You
On Mon, Mar 25, 2002 at 12:18:44PM -0800, Jeff Bailey wrote:
> Worse is the idea of what would happen if a GNU/Hurd binary were run
> on a GNU/Linux system. You can almost guarantee buffer overruns in
> that case.
Why?
Marcus
--
`Rhubarb is no Egyptian god.' Debian http://www.debian.org [EMAI
Thanks for all the comments. I do appreciate them. I think I've almost
figured out how to do a changelog entry ;)
=
James Morrison
University of Waterloo
Computer Science - Digital Hardware
2A co-op
http://hurd.dyndns.org
Anyone refering this as 'Open Source' shall be eaten by
* [Wolfgang Jährling]
> might even introduce a security problem. Thus we would need to recompile
> all programs anyway. I can't see the point of having binary
> compatiblity then.
If a user just wants to play Quake V or Duke Nukem Forever, he might not
need to care about PATH_MAX, as these prog
On Mon, Mar 25, 2002 at 08:47:44PM +0100, Niels Möller wrote:
> How hard would it be to create a new store type that basically
> implements only a write-cache: It would have store_write put the
> modified block into a queue, from which blocks are written to the
> underlying store later by a separa
> Exactly. A harmless construct might even introduce a security
> problem. Thus we would need to recompile all programs anyway. I
> can't see the point of having binary compatiblity then.
Worse is the idea of what would happen if a GNU/Hurd binary were run
on a GNU/Linux system. You can almost
Jeroen Dekkers <[EMAIL PROTECTED]> wrote:
> I doubt if binary compatibility with GNU/Linux is a good thing to
> have. It looks like we are then bound to the ABI and can't change it
> if we want to keep compatibility. There are also other problems, for
> example a program compiled on GNU/Linux coul
Jon Arney <[EMAIL PROTECTED]> writes:
> For instance, a simple LRU cache algorithm implemented in
> 'libstore' might provide a large performance advantage with
> the caveat that it might occasionally lead to disk inconsistencies.
The important thing for this problem is to cache writes, I think.
> Yeah, that seems to be the case. I have printed out the user id and
> group id vectors and the stat user and group fields that are looked for.
> The latter were normal, the former were empty.
The thing to do now is look at the creation of the iouser, which is the
server's side of the authentic
--- Ognyan Kulev <[EMAIL PROTECTED]> wrote:
> Hi,
>
> In `libc/hurd/hurdmalloc.c:198' the value of NBUCKETS is defined as 29
> and this is correct when LOG2_MIN_SIZE is 3. But when MCHECK is defined
> LOG2_MIN_SIZE becomes 4 and NBUCKETS must be 28.
>
> Regards
> --
> Ognyan Kulev <[EMAIL P
I noticed this activity as well quite a while back. It's not
limited to 'rm'. I also wrote a similar test script with 'mv'
and even a 'hello-world' with 'rename' to continuously rename
a file from 'foo.0' to foo.fff and the drive light just went
_crazy_. As you observed, the same sort of th
Hi,
In `libc/hurd/hurdmalloc.c:198' the value of NBUCKETS is defined as 29
and this is correct when LOG2_MIN_SIZE is 3. But when MCHECK is defined
LOG2_MIN_SIZE becomes 4 and NBUCKETS must be 28.
Regards
--
Ognyan Kulev <[EMAIL PROTECTED]>, "\"Programmer\""
2002-03-25 Ognyan Kulev <[EMAIL
Hi,
In `libc/hurd/hurdmalloc.c:281' there is an assertion that is triggered
when SIZE has value ((1 << 31) - 1). Instead of assertion failure the
function must return 0. Here is a patch that checks SIZE in different way.
BTW I didn't compile neither the previous patched `hurdchdir.c' nor thi
On Mon, Mar 25, 2002 at 01:54:42AM -0500, Roland McGrath wrote:
> And even if you hack all the header files, there's still inlined versions
> from things compiled for GNU/Linux one day when we have binary compatibility.
I doubt if binary compatibility with GNU/Linux is a good thing to
have. It lo
Hi,
C89, SUSv3[1] and glibc for Linux do free(p) when realloc(p,0) is called
and p != 0. The patch fixes this incompatibility in
`libc/hurd/hurdmalloc.c'.
Again, this patched is not tested and it must be applied after the
previous patch about `malloc((1<<31)-1)'.
Regards
[1] http://www.ope
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[EMAIL PROTECTED] (Thomas Bushnell, BSG) writes:
> It must guarantee that the directory is updated to drop the link
> *before* the inode refcnt is decremented and the inode possibly
> cleared.
>
> So it synchronously writes the directory, and then lets the inode get
> cleared on the next regular
Atle <[EMAIL PROTECTED]> writes:
> When running a telnet session from my Linux PC to a BSD box, I see the
> disk lamp go on, and I hear the disk go 'chack' each time I press a key
> on the keyboard!
It's updating the mtime on the terminal node.
___
B
Marcus Brinkmann wrote:
>
> On Mon, Mar 25, 2002 at 04:18:05PM +0100, Philip Dodd wrote:
> > One of the things I first noticed when running the Hurd (particularly
> > because it was running with an old and very noisy HD) was the incredible
> > amount of disk activity compared with exactly the sam
On Mon, Mar 25, 2002 at 10:07:25AM -0500, Marcus Brinkmann wrote:
> Hi,
>
> I just found out that
>
> while touch /tmp/foo; do rm /tmp/foo; done
>
> causes a lot of disk activity. Further tests showed that the disk is
> activated for each rm. Is this a hard requirement? In Linux, the loop
>
Marcus Brinkmann <[EMAIL PROTECTED]> writes:
> causes a lot of disk activity. Further tests showed that the disk is
> activated for each rm. Is this a hard requirement? In Linux, the loop
> above does not cause any disk activity (except at the beginning and
> maybe at the end), it seems to be
On Mon, Mar 25, 2002 at 10:23:25AM -0500, Marcus Brinkmann wrote:
> On Mon, Mar 25, 2002 at 04:18:05PM +0100, Philip Dodd wrote:
> > One of the things I first noticed when running the Hurd (particularly
> > because it was running with an old and very noisy HD) was the incredible
> > amount of disk
On Mon, Mar 25, 2002 at 01:15:16AM -0500, Roland McGrath wrote:
> I think that fshelp_isowner in libfshelp/perms-isowner.c should be the only
> place making this decision. So you can hack that function to print out
> details when it makes a negative decision, if it's not convenient to just
> debu
On Mon, Mar 25, 2002 at 04:18:05PM +0100, Philip Dodd wrote:
> One of the things I first noticed when running the Hurd (particularly
> because it was running with an old and very noisy HD) was the incredible
> amount of disk activity compared with exactly the same box running any other
> OS. This
One of the things I first noticed when running the Hurd (particularly
because it was running with an old and very noisy HD) was the incredible
amount of disk activity compared with exactly the same box running any other
OS. This is of course an entirely subjective expression of opinion, and
shoul
Hi,
I just found out that
while touch /tmp/foo; do rm /tmp/foo; done
causes a lot of disk activity. Further tests showed that the disk is
activated for each rm. Is this a hard requirement? In Linux, the loop
above does not cause any disk activity (except at the beginning and
maybe at the end
Hi,
`_hurd_change_directory_port_from_name' in `libc/hurd/hurdchdir.c' tests
if the given name ends with `/.'. But with the current code if "." is
given and this string starts exactly at page boundary and the previous
page is not vm_allocated then SIGSEGV will be raised.
Regards
--
Ognyan K
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