#40633 [NEW]: disk_free_space returns a bad result on filesystems with negative free space

[adam-phpbugs at adam dot gs]

From: adam-phpbugs at adam dot gs
Operating system: *BSD (at least)
PHP version: 5.2.1
PHP Bug Type: Filesystem function related
Bug description: disk_free_space returns a bad result on filesystems with negative free space

Description:
------------
on a filesystem with a negative amount of free space (this
can happen on at least FreeBSD) disk_free_space returns
unreasonable results.

-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:55]=-
[root@cube]# php -r 'print disk_free_space(".")."\n";'
3.77789318629E+22
-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:57]=-
[root@cube]# df -h .
Filesystem Size Used Avail Capacity Mounted on
/dev/ad7 289G 289G -23G 109% /some/path
-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:58]=-
[root@cube]# df .
Filesystem 1K-blocks Used Avail Capacity Mounted
on
/dev/ad7 302732078 302699550 -24186038 109% /some/
path


Reproduce code:
---------------
php -r 'print disk_free_space(".")."\n";'

Expected result:
----------------
-24186038

Actual result:
--------------
3.77789318629E+22

--
Edit bug report at [url]http://bugs.php.net/?id=40633&edit=1[/url]
--
Try a CVS snapshot (PHP 4.4): [url]http://bugs.php.net/fix.php?id=40633&r=trysnapshot44[/url]
Try a CVS snapshot (PHP 5.2): [url]http://bugs.php.net/fix.php?id=40633&r=trysnapshot52[/url]
Try a CVS snapshot (PHP 6.0): [url]http://bugs.php.net/fix.php?id=40633&r=trysnapshot60[/url]
Fixed in CVS: [url]http://bugs.php.net/fix.php?id=40633&r=fixedcvs[/url]
Fixed in release: [url]http://bugs.php.net/fix.php?id=40633&r=alreadyfixed[/url]
Need backtrace: [url]http://bugs.php.net/fix.php?id=40633&r=needtrace[/url]
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Try newer version: [url]http://bugs.php.net/fix.php?id=40633&r=oldversion[/url]
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Expected behavior: [url]http://bugs.php.net/fix.php?id=40633&r=notwrong[/url]
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Submitted twice: [url]http://bugs.php.net/fix.php?id=40633&r=submittedtwice[/url]
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Install GNU Sed: [url]http://bugs.php.net/fix.php?id=40633&r=gnused[/url]
Floating point limitations: [url]http://bugs.php.net/fix.php?id=40633&r=float[/url]
No Zend Extensions: [url]http://bugs.php.net/fix.php?id=40633&r=nozend[/url]
MySQL Configuration Error: [url]http://bugs.php.net/fix.php?id=40633&r=mysqlcfg[/url]

[tony2001@php.net]

ID: 40633
Updated by: [email]tony2001@php.net[/email]
Reported By: adam-phpbugs at adam dot gs
-Status: Open
+Status: Feedback
Bug Type: Filesystem function related
Operating System: *BSD (at least)
PHP Version: 5.2.1
New Comment:

What kind of BSD is that and don't you think that negative free space
is a BSD bug?


Previous Comments:
------------------------------------------------------------------------

[2007-02-26 00:55:02] adam-phpbugs at adam dot gs

Description:
------------
on a filesystem with a negative amount of free space (this
can happen on at least FreeBSD) disk_free_space returns
unreasonable results.

-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:55]=-
[root@cube]# php -r 'print disk_free_space(".")."\n";'
3.77789318629E+22
-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:57]=-
[root@cube]# df -h .
Filesystem Size Used Avail Capacity Mounted on
/dev/ad7 289G 289G -23G 109% /some/path
-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:58]=-
[root@cube]# df .
Filesystem 1K-blocks Used Avail Capacity Mounted
on
/dev/ad7 302732078 302699550 -24186038 109% /some/
path


Reproduce code:
---------------
php -r 'print disk_free_space(".")."\n";'

Expected result:
----------------
-24186038

Actual result:
--------------
3.77789318629E+22


------------------------------------------------------------------------


--
Edit this bug report at [url]http://bugs.php.net/?id=40633&edit=1[/url]

[adam-phpbugs at adam dot gs]

ID: 40633
User updated by: adam-phpbugs at adam dot gs
Reported By: adam-phpbugs at adam dot gs
-Status: Feedback
+Status: Open
Bug Type: Filesystem function related
Operating System: *BSD (at least)
PHP Version: 5.2.1
New Comment:

This was FreeBSD

if you look at the FreeBSD manpage for tunefs(8), this is
the intended behaviour.

[url]http://www.freebsd.org/cgi/man.cgi?[/url]
query=tunefs&apropos=0&sektion=0&manpath=FreeBSD+6 .2-
RELEASE&format=html


Basically, in FreeBSD (under UFS2 at least) avaliable space
is calculated as total minus used minus reserved. A small %
(8 by default) is reserved.

So, this is not really a bug, but actually an intended
feature.


Previous Comments:
------------------------------------------------------------------------

[2007-02-26 09:33:41] [email]tony2001@php.net[/email]

What kind of BSD is that and don't you think that negative free space
is a BSD bug?

------------------------------------------------------------------------

[2007-02-26 00:55:02] adam-phpbugs at adam dot gs

Description:
------------
on a filesystem with a negative amount of free space (this
can happen on at least FreeBSD) disk_free_space returns
unreasonable results.

-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:55]=-
[root@cube]# php -r 'print disk_free_space(".")."\n";'
3.77789318629E+22
-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:57]=-
[root@cube]# df -h .
Filesystem Size Used Avail Capacity Mounted on
/dev/ad7 289G 289G -23G 109% /some/path
-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:58]=-
[root@cube]# df .
Filesystem 1K-blocks Used Avail Capacity Mounted
on
/dev/ad7 302732078 302699550 -24186038 109% /some/
path


Reproduce code:
---------------
php -r 'print disk_free_space(".")."\n";'

Expected result:
----------------
-24186038

Actual result:
--------------
3.77789318629E+22


------------------------------------------------------------------------


--
Edit this bug report at [url]http://bugs.php.net/?id=40633&edit=1[/url]

[adam-phpbugs at adam dot gs]

ID: 40633
User updated by: adam-phpbugs at adam dot gs
Reported By: adam-phpbugs at adam dot gs
Status: Open
Bug Type: Filesystem function related
-Operating System: *BSD (at least)
+Operating System: FreeBSD
PHP Version: 5.2.1
New Comment:

changing OS to FreeBSD


Previous Comments:
------------------------------------------------------------------------

[2007-02-26 13:32:36] adam-phpbugs at adam dot gs

This was FreeBSD

if you look at the FreeBSD manpage for tunefs(8), this is
the intended behaviour.

[url]http://www.freebsd.org/cgi/man.cgi?[/url]
query=tunefs&apropos=0&sektion=0&manpath=FreeBSD+6 .2-
RELEASE&format=html


Basically, in FreeBSD (under UFS2 at least) avaliable space
is calculated as total minus used minus reserved. A small %
(8 by default) is reserved.

So, this is not really a bug, but actually an intended
feature.

------------------------------------------------------------------------

[2007-02-26 09:33:41] [email]tony2001@php.net[/email]

What kind of BSD is that and don't you think that negative free space
is a BSD bug?

------------------------------------------------------------------------

[2007-02-26 00:55:02] adam-phpbugs at adam dot gs

Description:
------------
on a filesystem with a negative amount of free space (this
can happen on at least FreeBSD) disk_free_space returns
unreasonable results.

-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:55]=-
[root@cube]# php -r 'print disk_free_space(".")."\n";'
3.77789318629E+22
-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:57]=-
[root@cube]# df -h .
Filesystem Size Used Avail Capacity Mounted on
/dev/ad7 289G 289G -23G 109% /some/path
-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:58]=-
[root@cube]# df .
Filesystem 1K-blocks Used Avail Capacity Mounted
on
/dev/ad7 302732078 302699550 -24186038 109% /some/
path


Reproduce code:
---------------
php -r 'print disk_free_space(".")."\n";'

Expected result:
----------------
-24186038

Actual result:
--------------
3.77789318629E+22


------------------------------------------------------------------------


--
Edit this bug report at [url]http://bugs.php.net/?id=40633&edit=1[/url]

[tony2001@php.net]

ID: 40633
Updated by: [email]tony2001@php.net[/email]
Reported By: adam-phpbugs at adam dot gs
-Status: Open
+Status: Feedback
Bug Type: Filesystem function related
Operating System: FreeBSD
PHP Version: 5.2.1
New Comment:

Please provide an SSH account on a machine where I can reproduce it.


Previous Comments:
------------------------------------------------------------------------

[2007-02-26 13:33:03] adam-phpbugs at adam dot gs

changing OS to FreeBSD

------------------------------------------------------------------------

[2007-02-26 13:32:36] adam-phpbugs at adam dot gs

This was FreeBSD

if you look at the FreeBSD manpage for tunefs(8), this is
the intended behaviour.

[url]http://www.freebsd.org/cgi/man.cgi?[/url]
query=tunefs&apropos=0&sektion=0&manpath=FreeBSD+6 .2-
RELEASE&format=html


Basically, in FreeBSD (under UFS2 at least) avaliable space
is calculated as total minus used minus reserved. A small %
(8 by default) is reserved.

So, this is not really a bug, but actually an intended
feature.

------------------------------------------------------------------------

[2007-02-26 09:33:41] [email]tony2001@php.net[/email]

What kind of BSD is that and don't you think that negative free space
is a BSD bug?

------------------------------------------------------------------------

[2007-02-26 00:55:02] adam-phpbugs at adam dot gs

Description:
------------
on a filesystem with a negative amount of free space (this
can happen on at least FreeBSD) disk_free_space returns
unreasonable results.

-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:55]=-
[root@cube]# php -r 'print disk_free_space(".")."\n";'
3.77789318629E+22
-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:57]=-
[root@cube]# df -h .
Filesystem Size Used Avail Capacity Mounted on
/dev/ad7 289G 289G -23G 109% /some/path
-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:58]=-
[root@cube]# df .
Filesystem 1K-blocks Used Avail Capacity Mounted
on
/dev/ad7 302732078 302699550 -24186038 109% /some/
path


Reproduce code:
---------------
php -r 'print disk_free_space(".")."\n";'

Expected result:
----------------
-24186038

Actual result:
--------------
3.77789318629E+22


------------------------------------------------------------------------


--
Edit this bug report at [url]http://bugs.php.net/?id=40633&edit=1[/url]

[tony2001@php.net]

ID: 40633
Updated by: [email]tony2001@php.net[/email]
Reported By: adam-phpbugs at adam dot gs
-Status: Feedback
+Status: Analyzed
Bug Type: Filesystem function related
Operating System: FreeBSD
PHP Version: 5.2.1
-Assigned To:
+Assigned To: tony2001


Previous Comments:
------------------------------------------------------------------------

[2007-02-26 15:44:08] [email]tony2001@php.net[/email]

Please provide an SSH account on a machine where I can reproduce it.

------------------------------------------------------------------------

[2007-02-26 13:33:03] adam-phpbugs at adam dot gs

changing OS to FreeBSD

------------------------------------------------------------------------

[2007-02-26 13:32:36] adam-phpbugs at adam dot gs

This was FreeBSD

if you look at the FreeBSD manpage for tunefs(8), this is
the intended behaviour.

[url]http://www.freebsd.org/cgi/man.cgi?[/url]
query=tunefs&apropos=0&sektion=0&manpath=FreeBSD+6 .2-
RELEASE&format=html


Basically, in FreeBSD (under UFS2 at least) avaliable space
is calculated as total minus used minus reserved. A small %
(8 by default) is reserved.

So, this is not really a bug, but actually an intended
feature.

------------------------------------------------------------------------

[2007-02-26 09:33:41] [email]tony2001@php.net[/email]

What kind of BSD is that and don't you think that negative free space
is a BSD bug?

------------------------------------------------------------------------

[2007-02-26 00:55:02] adam-phpbugs at adam dot gs

Description:
------------
on a filesystem with a negative amount of free space (this
can happen on at least FreeBSD) disk_free_space returns
unreasonable results.

-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:55]=-
[root@cube]# php -r 'print disk_free_space(".")."\n";'
3.77789318629E+22
-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:57]=-
[root@cube]# df -h .
Filesystem Size Used Avail Capacity Mounted on
/dev/ad7 289G 289G -23G 109% /some/path
-=[/some/path]=- -=[Sun Feb 25]=- -=[19:51:58]=-
[root@cube]# df .
Filesystem 1K-blocks Used Avail Capacity Mounted
on
/dev/ad7 302732078 302699550 -24186038 109% /some/
path


Reproduce code:
---------------
php -r 'print disk_free_space(".")."\n";'

Expected result:
----------------
-24186038

Actual result:
--------------
3.77789318629E+22


------------------------------------------------------------------------


--
Edit this bug report at [url]http://bugs.php.net/?id=40633&edit=1[/url]