linux-ext4 - Re: lsetxattr/lgetxattr on ext4.

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Date:	Thu, 01 Apr 2010 14:54:56 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	jvrao <jvrao@...ux.vnet.ibm.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: lsetxattr/lgetxattr on ext4.

On Wed, 2010-03-31 at 17:06 -0700, jvrao wrote:
> lsetxattr()/lgetxsttr() functions are not working on a ext4 symlink. 
> But works fine on a regular file.
> 
> I tried the following program.. Not sure if I am missing something.
> Any help will be appreciated.
> 
> 


I tried your test program on ext2/3/btrfs, it seems all broken. 
Not sure how this not being visible? Thought xattrs are heavily used by
default on some distros.


Mingming

> --------- simple program -------------
> [jvrao]# cat sxl.c
> #include <stdio.h>
> #include <sys/types.h>
> #include <attr/xattr.h>
> 
> main()
> {
> 	int ha=5;
> 	int ha_out=-1;
> 	int err;
> 	err = lsetxattr("./foo", "user.junk", &ha, sizeof(int),0);
> 	if (err == -1)
> 		perror("lsetxattr failed");
> 	lgetxattr("./foo", "user.junk", &ha_out, sizeof(int));
> 	if (err == -1)
> 		perror("lsetxattr failed");
> 	printf("file:./foo ha:%d  ha_out:%d\n", ha, ha_out);
> 
> 	ha_out = -1;
> 	err = lsetxattr("./foo.sl", "user.junk", &ha, sizeof(int),0);
> 	if (err == -1)
> 		perror("lsetxattr failed");
> 	lgetxattr("./foo.sl", "user.junk", &ha_out, sizeof(int));
> 	if (err == -1)
> 		perror("lsetxattr failed");
> 	printf("file:./foo.sl  ha:%d  ha_out:%d\n", ha, ha_out);
> }
> ------------------------
> 
> [jvrao]# ls -l foo*
> -rw-r--r--. 1 root root 0 2010-03-31 16:49 foo
> lrwxrwxrwx. 1 root root 3 2010-03-31 16:49 foo.sl -> foo
> 
> [jvrao]# ./sxl
> file:./foo ha:5  ha_out:5
> lsetxattr failed: Operation not permitted
> lsetxattr failed: Operation not permitted
> file:./foo.sl  ha:5  ha_out:-1
> 
> 
> 
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