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Subject: bug#13582: [PATCH] stat: add ext4 to the ext2/ext3 list
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Since ext4 returns the same info as ext2/ext3, add it to the list.
This fixes the output of running `stat -f / -c %T` on my system that
has an ext4 rootfs.
* src/stat.c (human_fstype): Add "ext4" to the S_MAGIC_EXT2 and
FSTYPE_EXT2FS cases.
---
src/stat.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/src/stat.c b/src/stat.c
index dd210d1..d3d7190 100644
--- a/src/stat.c
+++ b/src/stat.c
@@ -293,7 +293,7 @@ human_fstype (STRUCT_STATVFS const *statfsbuf)
case S_MAGIC_EXT: /* 0x137D local */
return "ext";
case S_MAGIC_EXT2: /* 0xEF53 local */
- return "ext2/ext3";
+ return "ext2/ext3/ext4";
case S_MAGIC_EXT2_OLD: /* 0xEF51 local */
return "ext2";
case S_MAGIC_FAT: /* 0x4006 local */
@@ -480,7 +480,7 @@ human_fstype (STRUCT_STATVFS const *statfsbuf)
case FSTYPE_MISC:
return "misc";
case FSTYPE_EXT2FS:
- return "ext2/ext3";
+ return "ext2/ext3/ext4";
case FSTYPE_HTTP:
return "http";
case FSTYPE_MEMFS:
--
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Subject: bug#13582: [PATCH] stat: add ext4 to the ext2/ext3 list
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Mike Frysinger wrote:
> Since ext4 returns the same info as ext2/ext3, add it to the list.
> This fixes the output of running `stat -f / -c %T` on my system that
> has an ext4 rootfs.
>
> * src/stat.c (human_fstype): Add "ext4" to the S_MAGIC_EXT2 and
> FSTYPE_EXT2FS cases.
Previous discussion (wow, three years ago now):
http://lists.gnu.org/archive/html/bug-coreutils/2009-02/msg00160.html
Bob
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Subject: bug#13582: closed ([PATCH] stat: add ext4 to the ext2/ext3 list)
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and subject line Re: bug#13582: [PATCH] stat: add ext4 to the ext2/ext3 list
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--=20
13582: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D13582
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From: Mike Frysinger <vapier@HIDDEN>
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Subject: [PATCH] stat: add ext4 to the ext2/ext3 list
Date: Tue, 29 Jan 2013 01:13:49 -0500
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Since ext4 returns the same info as ext2/ext3, add it to the list.
This fixes the output of running `stat -f / -c %T` on my system that
has an ext4 rootfs.
* src/stat.c (human_fstype): Add "ext4" to the S_MAGIC_EXT2 and
FSTYPE_EXT2FS cases.
---
src/stat.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/src/stat.c b/src/stat.c
index dd210d1..d3d7190 100644
--- a/src/stat.c
+++ b/src/stat.c
@@ -293,7 +293,7 @@ human_fstype (STRUCT_STATVFS const *statfsbuf)
case S_MAGIC_EXT: /* 0x137D local */
return "ext";
case S_MAGIC_EXT2: /* 0xEF53 local */
- return "ext2/ext3";
+ return "ext2/ext3/ext4";
case S_MAGIC_EXT2_OLD: /* 0xEF51 local */
return "ext2";
case S_MAGIC_FAT: /* 0x4006 local */
@@ -480,7 +480,7 @@ human_fstype (STRUCT_STATVFS const *statfsbuf)
case FSTYPE_MISC:
return "misc";
case FSTYPE_EXT2FS:
- return "ext2/ext3";
+ return "ext2/ext3/ext4";
case FSTYPE_HTTP:
return "http";
case FSTYPE_MEMFS:
--
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To: Mike Frysinger <vapier@HIDDEN>
Subject: Re: bug#13582: [PATCH] stat: add ext4 to the ext2/ext3 list
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tag 13582 + notabug
close 13582
stop
On 01/29/2013 07:13 AM, Mike Frysinger wrote:
> Since ext4 returns the same info as ext2/ext3, add it to the list.
> This fixes the output of running `stat -f / -c %T` on my system that
> has an ext4 rootfs.
Thanks for the patch, however, you submitted it to the bug-coreutils
mailing list which automatically opened a new ticket. Therefore, I'm
closing the bug (not intending to stop the discussion). Please use the
general discussion list coreutils@HIDDEN next time.
Re. EXT4:
this has been discussed recently:
http://lists.gnu.org/archive/html/coreutils/2012-12/msg00068.html
Have a nice day,
Berny
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Your bug report
#13582: [PATCH] stat: add ext4 to the ext2/ext3 list
which was filed against the coreutils package, has been closed.
The explanation is attached below, along with your original report.
If you require more details, please reply to 13582 <at> debbugs.gnu.org.
--=20
13582: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D13582
GNU Bug Tracking System
Contact help-debbugs@HIDDEN with problems
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tag 13582 + notabug
close 13582
stop
On 01/29/2013 07:13 AM, Mike Frysinger wrote:
> Since ext4 returns the same info as ext2/ext3, add it to the list.
> This fixes the output of running `stat -f / -c %T` on my system that
> has an ext4 rootfs.
Thanks for the patch, however, you submitted it to the bug-coreutils
mailing list which automatically opened a new ticket. Therefore, I'm
closing the bug (not intending to stop the discussion). Please use the
general discussion list coreutils@HIDDEN next time.
Re. EXT4:
this has been discussed recently:
http://lists.gnu.org/archive/html/coreutils/2012-12/msg00068.html
Have a nice day,
Berny
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Subject: [PATCH] stat: add ext4 to the ext2/ext3 list
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Since ext4 returns the same info as ext2/ext3, add it to the list.
This fixes the output of running `stat -f / -c %T` on my system that
has an ext4 rootfs.
* src/stat.c (human_fstype): Add "ext4" to the S_MAGIC_EXT2 and
FSTYPE_EXT2FS cases.
---
src/stat.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/src/stat.c b/src/stat.c
index dd210d1..d3d7190 100644
--- a/src/stat.c
+++ b/src/stat.c
@@ -293,7 +293,7 @@ human_fstype (STRUCT_STATVFS const *statfsbuf)
case S_MAGIC_EXT: /* 0x137D local */
return "ext";
case S_MAGIC_EXT2: /* 0xEF53 local */
- return "ext2/ext3";
+ return "ext2/ext3/ext4";
case S_MAGIC_EXT2_OLD: /* 0xEF51 local */
return "ext2";
case S_MAGIC_FAT: /* 0x4006 local */
@@ -480,7 +480,7 @@ human_fstype (STRUCT_STATVFS const *statfsbuf)
case FSTYPE_MISC:
return "misc";
case FSTYPE_EXT2FS:
- return "ext2/ext3";
+ return "ext2/ext3/ext4";
case FSTYPE_HTTP:
return "http";
case FSTYPE_MEMFS:
--
1.8.0.2
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On Tuesday 29 January 2013 01:57:42 Bernhard Voelker wrote:
> tag 13582 + notabug
> close 13582
> stop
>=20
> On 01/29/2013 07:13 AM, Mike Frysinger wrote:
> > Since ext4 returns the same info as ext2/ext3, add it to the list.
> > This fixes the output of running `stat -f / -c %T` on my system that
> > has an ext4 rootfs.
>=20
> Thanks for the patch, however, you submitted it to the bug-coreutils
> mailing list which automatically opened a new ticket. Therefore, I'm
> closing the bug (not intending to stop the discussion). Please use the
> general discussion list coreutils@HIDDEN next time.
that's not really what the top level README files indicate in the coreutils=
=20
repo
=2Dmike
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On 01/29/2013 07:39 PM, Mike Frysinger wrote:> On Tuesday 29 January 2013 01:57:42 Bernhard Voelker wrote:
>> On 01/29/2013 07:13 AM, Mike Frysinger wrote:
>> Thanks for the patch, however, you submitted it to the bug-coreutils
>> mailing list which automatically opened a new ticket. Therefore, I'm
>> closing the bug (not intending to stop the discussion). Please use the
>> general discussion list coreutils@HIDDEN next time.
>
> that's not really what the top level README files indicate in the coreutils
> repo
Hi Mike,
I feel very sorry if my words were a bit harsh.
Admitted, you refer to this in README:
If your patch adds a new feature, please try to get some sort of consensus
that it is a worthwhile change. One way to do that is to send mail to
bug-coreutils@HIDDEN including as much description and justification
as you can. Based on the feedback that generates, you may be able to
convince us that it's worth adding.
Hmm, in my opinion and what I have experienced in the last 2+ year
on the coreutils and bug-coreutils mailing lists, real bugs (or if
the user thinks it is one) should be handled in bug-coreutils, while
general discussion issues and topics including patches which need some
consensus (or review) should go to the main coreutils mailing list.
But as Bob also stated off-list, your patch is some corner case:
But it is a grey area needing a judgement call. Certainly a
submission that is simply, "what do you think about this" would
be a discussion issue.
Sorry again.
Back to EXT*:
I think one problem is that an ext2 or ext3 file system can be mounted
as ext2, ext3, or ext4, while an ext4 file system can only be mounted
as ext4, not as ext2/ext3. Therefore, a detection of the real type would
probably be worthwhile. OTOH a running program may not need to care about
how this file system could be mounted otherwise.
Have a nice day,
Berny
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reopen 13582
severity 13582 wishlist
thanks
Bernhard Voelker wrote:
> I feel very sorry if my words were a bit harsh.
>
> Admitted, you refer to this in README:
>
> If your patch adds a new feature, please try to get some sort of consensus
> that it is a worthwhile change. One way to do that is to send mail to
> bug-coreutils@HIDDEN including as much description and justification
> as you can. Based on the feedback that generates, you may be able to
> convince us that it's worth adding.
I think that text should be updated to reflect the current positioning
of the bug tracker behind the bug-coreutils address. Let's do that in
a separate discussion not in this one about stat and ext*.
> Hmm, in my opinion and what I have experienced in the last 2+ year
> on the coreutils and bug-coreutils mailing lists, real bugs (or if
> the user thinks it is one) should be handled in bug-coreutils, while
> general discussion issues and topics including patches which need some
> consensus (or review) should go to the main coreutils mailing list.
>
> But as Bob also stated off-list, your patch is some corner case:
>
> But it is a grey area needing a judgement call. Certainly a
> submission that is simply, "what do you think about this" would
> be a discussion issue.
>
> Sorry again.
And I had also said this there too:
I think it is okay to have actual patch submissions open tickets for
tracking. Those are pretty rare in general. When they implement
features they can be marked as a wishlist item. If that feature is
decided not to be done then they can be marked as "wontfix". For this
particular item I think that may be more appropriate as the topic has
come up more than once.
And so I have done that. I didn't tag it wontfix because I am not
sure the discussion is complete to concensus yet. Perhaps some
different but better behavior will result.
Bob
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Received: (at control) by debbugs.gnu.org; 30 Jan 2013 20:52:56 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Jan 30 15:52:56 2013 Received: from localhost ([127.0.0.1]:56272 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1U0eeN-0003fe-Em for submit <at> debbugs.gnu.org; Wed, 30 Jan 2013 15:52:55 -0500 Received: from joseki.proulx.com ([216.17.153.58]:51205) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from <bob@HIDDEN>) id 1U0eeK-0003fR-Je; Wed, 30 Jan 2013 15:52:54 -0500 Received: from hysteria.proulx.com (hysteria.proulx.com [192.168.230.119]) by joseki.proulx.com (Postfix) with ESMTP id 74B21211D6; Wed, 30 Jan 2013 13:52:13 -0700 (MST) Received: by hysteria.proulx.com (Postfix, from userid 1000) id 4F5362DCC0; Wed, 30 Jan 2013 13:52:13 -0700 (MST) Date: Wed, 30 Jan 2013 13:52:13 -0700 From: Bob Proulx <bob@HIDDEN> To: 13582 <at> debbugs.gnu.org Subject: Re: bug#13582: [PATCH] stat: add ext4 to the ext2/ext3 list Message-ID: <20130130205213.GA16391@HIDDEN> References: <1359440029-19161-1-git-send-email-vapier@HIDDEN> <510772E6.3050906@HIDDEN> <201301291339.43815.vapier@HIDDEN> <51082EE8.1050006@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <51082EE8.1050006@HIDDEN> User-Agent: Mutt/1.5.21 (2010-09-15) X-Spam-Score: 0.3 (/) X-Debbugs-Envelope-To: control X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Sender: debbugs-submit-bounces <at> debbugs.gnu.org Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org X-Spam-Score: 0.3 (/) reopen 13582 severity 13582 wishlist thanks Bernhard Voelker wrote: > I feel very sorry if my words were a bit harsh. > > Admitted, you refer to this in README: > > If your patch adds a new feature, please try to get some sort of consensus > that it is a worthwhile change. One way to do that is to send mail to > bug-coreutils@HIDDEN including as much description and justification > as you can. Based on the feedback that generates, you may be able to > convince us that it's worth adding. I think that text should be updated to reflect the current positioning of the bug tracker behind the bug-coreutils address. Let's do that in a separate discussion not in this one about stat and ext*. > Hmm, in my opinion and what I have experienced in the last 2+ year > on the coreutils and bug-coreutils mailing lists, real bugs (or if > the user thinks it is one) should be handled in bug-coreutils, while > general discussion issues and topics including patches which need some > consensus (or review) should go to the main coreutils mailing list. > > But as Bob also stated off-list, your patch is some corner case: > > But it is a grey area needing a judgement call. Certainly a > submission that is simply, "what do you think about this" would > be a discussion issue. > > Sorry again. And I had also said this there too: I think it is okay to have actual patch submissions open tickets for tracking. Those are pretty rare in general. When they implement features they can be marked as a wishlist item. If that feature is decided not to be done then they can be marked as "wontfix". For this particular item I think that may be more appropriate as the topic has come up more than once. And so I have done that. I didn't tag it wontfix because I am not sure the discussion is complete to concensus yet. Perhaps some different but better behavior will result. Bob
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Subject: bug#13582: [PATCH] stat: add ext4 to the ext2/ext3 list
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I am just adding references here to tie in the previous discussions.
The bugzilla.redhat.com discussion actually has the best analysis of
the problem. However let me summarize (and plagarize) as best as I
can here.
In https://bugzilla.redhat.com/show_bug.cgi?id=485507
Eric Sandeen proposed to add ext4 to the list of names
currently reported for that type of file system ("ext2/ext3").
In response Jim stated:
http://lists.gnu.org/archive/html/bug-coreutils/2009-02/msg00160.html
I'm reluctant to change that string, because doing so might
well break scripts that rely on them:
case $(stat -f --format %T .) in
ext2/ext3) ;;
*) destroy_partition ;;
esac
Sure, script writers might well anticipate this and
prefer to use the %t directive to get the type in hexadecimal,
but that's far less readable.
How much code (and how ugly) would be required to distinguish ext4
from ext[23]?
This was further reinforced by Jim in a later discussion:
http://lists.gnu.org/archive/html/bug-coreutils/2009-12/msg00229.html
For the ext4-adding part, I'm a little reluctant,
because it may break scripts that test via e.g.,
test "$(stat -f -c %T .)" = ext2/ext3 && ...
rather than the more portable -- in potential retrospect:
case $(stat -f -c %T .) in
ext2/ext3*) ... ;
esac
In the previous thread Eric suggested some pseudo-code flow to
distinguish ext4 from ext* but it would have needed significant effort
to complete. This was followed up in the in the bugzilla trail
especially this where we see that the problem of distinguishing ext4
is not trivial and opens a box of problems. I think it is worthwhile
to share it here.
https://bugzilla.redhat.com/show_bug.cgi?id=485507#c7
Eric Sandeen 2012-04-25 17:05:14 EDT
A big part of the problem is that "ext4" is a big, random collection
of features. It's more a new driver codebase containing various &
sundry new things, than a fixed on-disk format.
You can turn any/all of the following on or off and mount it with the
ext4 driver:
* extents
* delalloc
* flex_bg
* journaling
* 64-bitness
* "bigalloc"
* .... etc ....
So the question becomes, what exactly _is_ ext4? Best we can do is
"ext2/3/4" or so, I think.
https://bugzilla.redhat.com/show_bug.cgi?id=485507#c8
Ondrej Vasik 2012-04-25 19:33:20 EDT
But upstream (Jim Meyering) already rejected ext2/3/4 change - as it
may break scripts - and recognizing ext4 based on some feature might
be a tricky thing - as Eric mentioned - and will polute the stat
code. Bad luck that ext2/3/4 uses the same magic for all filesystems.
https://bugzilla.redhat.com/show_bug.cgi?id=485507#c9
Eric Sandeen 2012-04-25 20:08:06 EDT
Best to close it WONTFIX then, I guess?
https://bugzilla.redhat.com/show_bug.cgi?id=485507#c10
Ondrej Vasik 2012-04-26 02:06:03 EDT
Probably... closing WONTFIX, anyone - feel free to reopen it if you
find an easy way how to reliably distinguish ext2/3 and ext4
filesystem (or just propose it as reply in upstream thread mentioned
in comment #4 or #5 - as this possible change has to be done/accepted
upstream). These ways I'm aware of are too big for stat.c code.
I think the above rationale is still a good place to start. It is
unfortunate that ext4 is using the same identifier as ext3. And the
same that ext3 used the same identifier as ext2.
Bob
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On 01/30/2013 10:27 PM, Bob Proulx wrote:
> I am just adding references here to tie in the previous discussions.
Thanks for that excellent summary.
Reading (again) through it, it seems to me that we have 2 arguments:
a) basically, it would be good to be able to distinguish ext2/ext3
from ext4 while it is problematic in the real world due to EXT4's
nature - or at least would bring a lot of code into stat.
b) just adding "ext4" to "ext2/ext3" as it has already been proposed
by several people could break existing scripts that use code like this:
> test "$(stat -f -c %T .)" = ext2/ext3 && ...
I'm wondering how often users check for the hard coded string
"ext2/ext3"? Do we have any numbers?
Have a nice day,
Berny
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Subject: bug#13582: [PATCH] stat: add ext4 to the ext2/ext3 list
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Bernhard Voelker wrote:
> Reading (again) through it, it seems to me that we have 2 arguments:
>
> a) basically, it would be good to be able to distinguish ext2/ext3
> from ext4 while it is problematic in the real world due to EXT4's
> nature - or at least would bring a lot of code into stat.
Yes. And all of the problems of trying to chase details of every
random filesystem. It just seems like a bad slippery slope.
> b) just adding "ext4" to "ext2/ext3" as it has already been proposed
> by several people could break existing scripts that use code like this:
>
> > test "$(stat -f -c %T .)" = ext2/ext3 && ...
>
> I'm wondering how often users check for the hard coded string
> "ext2/ext3"? Do we have any numbers?
I haven't had any reason to check for that particular value. And
therefore for me the question is rather abstract. It would be very
useful to know the real world reason why people are looking at that
value in order to know what is best to do about it.
On the surface I don't think the proposed change is particularly
scary. Not as compared to changing head/tail option syntax for
example. Not as compared to changing regular expression range
interpretation and sort order in different locales for example. But
both of those have changed in recent history. This seems quite a bit
more mellow by comparison.
As someone with a lot of years and lines of script writing behind me I
would always be very paranoid about operations such as "destroy_data"
based upon some string value like this. I like to think that I
wouldn't be fooled into a data loss because of something like this. I
think changing it would have less impact than adding characters to the
'ls -l' mode display output for example.
However because the identifier is an ext2 identifier I would have
always reported it as ext2 regardless of whether ext3 or ext4 used it.
If there is no way to tell them apart then there is no way to tell.
Perhaps better to have reported the raw hex data value of it.
But that is all water under bridge now since the program was imported
with that "ext2/ext3" already emitted. There is no difference in
identifier between those and the newer ext4. I am inclined to say
that the identifier is "ext2" now even if ext5 uses it. What if some
new xjzfs uses that same identifier? It is the identifier that is
being reported and not the actual file system contents. Therefore I
wouldn't change it unless the identifier itself is changed.
Bob
X-Loop: help-debbugs@HIDDEN
Subject: bug#13582: [PATCH] stat: add ext4 to the ext2/ext3 list
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On 01/30/2013 11:44 PM, Bob Proulx wrote:
> Bernhard Voelker wrote:
>> b) just adding "ext4" to "ext2/ext3" as it has already been proposed
>> by several people could break existing scripts that use code like this:
>>
>>> test "$(stat -f -c %T .)" = ext2/ext3 && ...
>>
>> I'm wondering how often users check for the hard coded string
>> "ext2/ext3"? Do we have any numbers?
> On the surface I don't think the proposed change is particularly
> scary.
> [...]
>
> As someone with a lot of years and lines of script writing behind me I
> would always be very paranoid about operations such as "destroy_data"
> based upon some string value like this. I like to think that I
> wouldn't be fooled into a data loss because of something like this.
> [...]
That is about the same what I was thinking.
When someone has written a script managing partitions and file systems,
then I think he would (hopefully) never just use that well-cited
snippet to guard existing data against destroying:
case $(stat -f --format %T .) in
ext2/ext3) ;;
*) destroy_partition ;;
esac
First, it's running on Linux or another *NIX flavor, i.e. such
a script would have to check for many other file system types, too.
Is that reliable? Probably not.
Second, I think such a script would probably rely on other things
rather than using coreutils' stat - e.g. letting the kernel decide
by trying to "mount -r". Even 'file' knows how to distinguish
between ext3 and ext4:
$ file -s /dev/sdb3
/dev/sdb3: Linux rev 1.0 ext3 filesystem data, UUID=<...>, \
volume name "home" (needs journal recovery) (large files)
$ file -s /dev/sdb2
/dev/sdb2: Linux rev 1.0 ext4 filesystem data, UUID=<...>, \
volume name "rootfs" (extents) (large files) (huge files)
And third, if such a script really relied on stat, then I think
it would rather use `stat -f --format %t`, i.e. the type in hex,
wouldn't it?
> However because the identifier is an ext2 identifier I would have
> always reported it as ext2 regardless of whether ext3 or ext4 used it.
> If there is no way to tell them apart then there is no way to tell.
> Perhaps better to have reported the raw hex data value of it.
>
> But that is all water under bridge now since the program was imported
> with that "ext2/ext3" already emitted. There is no difference in
> identifier between those and the newer ext4. I am inclined to say
> that the identifier is "ext2" now even if ext5 uses it. What if some
> new xjzfs uses that same identifier? It is the identifier that is
> being reported and not the actual file system contents. Therefore I
> wouldn't change it unless the identifier itself is changed.
Right, stat is just reporting the human readable form of the
magic number. If that number is used by different file system
types, then stat should report all possibilities. It's the problem
of those file systems to use different magic numbers (or not).
I mean, the ext4 development team has deliberately chosen not to
use a new number - they will have had their reasons.
With all that said, I'd +1 the patch.
WDYT?
Have a nice day,
Berny
X-Loop: help-debbugs@HIDDEN
Subject: bug#13582: [PATCH] stat: add ext4 to the ext2/ext3 list
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On Thu, 2013-01-31 at 09:02 +0100, Bernhard Voelker wrote:
> On 01/30/2013 11:44 PM, Bob Proulx wrote:
> > Bernhard Voelker wrote:
> >> b) just adding "ext4" to "ext2/ext3" as it has already been proposed
> >> by several people could break existing scripts that use code like this:
> >>
> >>> test "$(stat -f -c %T .)" = ext2/ext3 && ...
> >>
> >> I'm wondering how often users check for the hard coded string
> >> "ext2/ext3"? Do we have any numbers?
>
> > On the surface I don't think the proposed change is particularly
> > scary.
> > [...]
> >
> > As someone with a lot of years and lines of script writing behind me I
> > would always be very paranoid about operations such as "destroy_data"
> > based upon some string value like this. I like to think that I
> > wouldn't be fooled into a data loss because of something like this.
> > [...]
>
> That is about the same what I was thinking.
> When someone has written a script managing partitions and file systems,
> then I think he would (hopefully) never just use that well-cited
> snippet to guard existing data against destroying:
>
> case $(stat -f --format %T .) in
> ext2/ext3) ;;
> *) destroy_partition ;;
> esac
>
> First, it's running on Linux or another *NIX flavor, i.e. such
> a script would have to check for many other file system types, too.
> Is that reliable? Probably not.
>
> Second, I think such a script would probably rely on other things
> rather than using coreutils' stat - e.g. letting the kernel decide
> by trying to "mount -r". Even 'file' knows how to distinguish
> between ext3 and ext4:
>
> $ file -s /dev/sdb3
> /dev/sdb3: Linux rev 1.0 ext3 filesystem data, UUID=<...>, \
> volume name "home" (needs journal recovery) (large files)
> $ file -s /dev/sdb2
> /dev/sdb2: Linux rev 1.0 ext4 filesystem data, UUID=<...>, \
> volume name "rootfs" (extents) (large files) (huge files)
file uses identifiers for several features (journal, small/large
INCOMPAT and RO_INCOMPAT) to distinguish the ext2 family filesystems. It
should be possible to check for them, but I would expect several dozens
lines of code - which is probably too much for stat code. In addition -
if we go for this, should we change the well established ext2/ext3 to
exact filesystem type, if we recognize it?
> > However because the identifier is an ext2 identifier I would have
> > always reported it as ext2 regardless of whether ext3 or ext4 used it.
> > If there is no way to tell them apart then there is no way to tell.
> > Perhaps better to have reported the raw hex data value of it.
> >
> > But that is all water under bridge now since the program was imported
> > with that "ext2/ext3" already emitted. There is no difference in
> > identifier between those and the newer ext4. I am inclined to say
> > that the identifier is "ext2" now even if ext5 uses it. What if some
> > new xjzfs uses that same identifier? It is the identifier that is
> > being reported and not the actual file system contents. Therefore I
> > wouldn't change it unless the identifier itself is changed.
>
> Right, stat is just reporting the human readable form of the
> magic number. If that number is used by different file system
> types, then stat should report all possibilities. It's the problem
> of those file systems to use different magic numbers (or not).
> I mean, the ext4 development team has deliberately chosen not to
> use a new number - they will have had their reasons.
>
> With all that said, I'd +1 the patch.
> WDYT?
Personally, I don't like the ext2/ext3/ext4 approach - simply because it
is too long (and very common). This may break some layout in the scripts
(although I admit badly written). Even with this long form, it will be
not the longest identifier, "minix v2 (30 char.)" is longer, so some
potential overflows of some buffer are again just because of bad
scripts/programs. I don't think that anybody would use the "destroy
other than ext2/ext3 partitions approach" in the script - so this is
more artificial than real life example... still, there might be real
life complains about this longer form.
But even the best one approach - having code to reliably distinguish
between the types - so reporting just ext4 (or ext3) may break some
scripts. ext[234] as well and might be confusing. Same with "ext2
family"...
For me - no good option (even the ext2. ext3 vs. ext4 identification is
not perfect way, may break scripts relying on ext2/ext3 as well)... only
choosing lesser evil...
Greetings,
Ondrej Vasik
Received: (at control) by debbugs.gnu.org; 14 Aug 2014 08:15:24 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Aug 14 04:15:24 2014 Received: from localhost ([127.0.0.1]:42879 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1XHqBv-0003Ip-Q1 for submit <at> debbugs.gnu.org; Thu, 14 Aug 2014 04:15:23 -0400 Received: from mail3.vodafone.ie ([213.233.128.45]:42664) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <P@HIDDEN>) id 1XHqBs-0003IN-Bz; Thu, 14 Aug 2014 04:15:21 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApQBAOVu7FNtT0IW/2dsb2JhbAANTYcwzyGDGwGBKIR7AQEEIw8BRhAJAg0LAgIFFgsCAgkDAgECAUUGDQEHAQGIQ5QZmz13lUAXgSyOIAeCeYFTAQSkCZEL Received: from unknown (HELO [192.168.1.43]) ([109.79.66.22]) by mail3.vodafone.ie with ESMTP; 14 Aug 2014 09:15:13 +0100 Message-ID: <53EC7011.3000206@HIDDEN> Date: Thu, 14 Aug 2014 09:15:13 +0100 From: =?UTF-8?B?UMOhZHJhaWcgQnJhZHk=?= <P@HIDDEN> User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 To: =?UTF-8?B?56mN5Li55bC8IERhbiBKYWNvYnNvbg==?= <jidanni@HIDDEN> Subject: Re: bug#18264: stat -f still only says ext2/ext3 References: <878ums9c0p.fsf@HIDDEN> In-Reply-To: <878ums9c0p.fsf@HIDDEN> X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: control Cc: 18264 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: 0.0 (/) unarchive 13582 forcemerge 13582 18264 stop On 08/14/2014 12:59 AM, 積丹尼 Dan Jacobson wrote: > $ stat -f /cf/zjidanni2 > File: "/cf/zjidanni2" > ID: 64adbb6653fa6353 Namelen: 255 Type: ext2/ext3 > Hey, it's ext4! > $ stat --version > stat (GNU coreutils) 8.21
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