From: bugme-daemon@bugzilla.kernel.org
Subject: [Bug 12793] New: ext4 gives wrong errno with too long extended attribute values
Date: Sun, 1 Mar 2009 04:40:58 -0800 (PST)
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Summary: ext4 gives wrong errno with too long extended attribute
values
Product: File System
Version: 2.5
KernelVersion: 2.6.29-rc6
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext4
AssignedTo: fs_ext4@kernel-bugs.osdl.org
ReportedBy: betelgeuse@gentoo.org
Latest working kernel version: haven't seen it working
Earliest failing kernel version: 2.6.28-gentoo-r1 had the same issue
Distribution: Gentoo
Hardware Environment: SMP Sun Mar 1 14:15:44 EET 2009 i686 Intel(R) Core(TM)2
CPU 6600 @ 2.40GHz GenuineIntel GNU/Linux
Software Environment: Gentoo ~x86
Problem Description:
>From man attr_set:
attr_set will fail if one or more of the following are true:
[ENOATTR] The attribute name given is not associated with the
indicated filesystem object and the ATTR_REPLACE flag bit was set.
[E2BIG] The value of the given attribute is too large, it
exceeds the maximum allowable size of an attribute value.
This is what the test script gives for ext4:
3900
4000
4100
Traceback (most recent call last):
File "test_xattr.py", line 10, in
xattr.set('/mnt/test/header.txt','user.test',s)
IOError: [Errno 28] No space left on device
This is what xfs gives:
65500
65600
Traceback (most recent call last):
File "test_xattr.py", line 10, in
xattr.set('/mnt/test/header.txt','user.test',s)
IOError: [Errno 7] Argument list too long
>>> errno.errorcode[7]
'E2BIG'
>>> errno.errorcode[28]
'ENOSPC'
Steps to reproduce:
betelgeuse@pena ~/python $ cat test_xattr.py
import xattr
hundred = ''
for i in range(100):
hundred+='a'
s=hundred
while True:
print len(s)
xattr.set('/mnt/test/header.txt','user.test',s)
s+=hundred
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