[patch 0/3] sysfs permissions

[Maneesh Soni <maneesh@in.ibm.com>]

Hi

Following this post, are the three patches implementing setattr functionality 
for sysfs objects. This allows sysfs objects to get their default attributes 
like owner, group, permission modes modified. The changed attributes are 
saved in a struct iattr linked with struct sysfs_dirent for the corresponding 
object. This keeps the inode attributes saved even if inode/dentry is 
evacuated due to memory pressure or umount. The struct iattr is allocated only 
for those sysfs objects for which inode attributes are getting changed.

I did the following test for verifying the patchset

[root@llm01 ~]# ls -l /sys/class/net/dummy0/address
-r--r--r--  1 root root 4096 May 31 10:32 /sys/class/net/dummy0/address
[root@llm01 ~]# chmod +w /sys/class/net/dummy0/address
[root@llm01 ~]# ls -l /sys/class/net/dummy0/address
-rw-r--r--  1 root root 4096 May 31 10:32 /sys/class/net/dummy0/address
[root@llm01 ~]#
[root@llm01 ~]# chown maneesh /sys/class/net/dummy0/address
[root@llm01 ~]# ls -l /sys/class/net/dummy0/address
-rw-r--r--  1 maneesh root 4096 May 31 10:32 /sys/class/net/dummy0/address
[root@llm01 ~]#
[root@llm01 ~]# chgrp maneesh /sys/class/net/dummy0/address
[root@llm01 ~]# ls -l /sys/class/net/dummy0/address
-rw-r--r--  1 maneesh maneesh 4096 May 31 10:32 /sys/class/net/dummy0/address
[root@llm01 ~]#
[root@llm01 ~]# umount /sys
[root@llm01 ~]# ls -l /sys/class/net/dummy0/address
ls: /sys/class/net/dummy0/address: No such file or directory
[root@llm01 ~]#
[root@llm01 ~]# mount -t sysfs none /sys
[root@llm01 ~]# ls -l /sys/class/net/dummy0/address
-rw-r--r--  1 maneesh maneesh 4096 May 31 10:32 /sys/class/net/dummy0/address


Please review/test.

Thanks
Maneesh


-- 
Maneesh Soni
Linux Technology Center, 
IBM India Software Labs,
Bangalore, India
email: maneesh@in.ibm.com
Phone: 91-80-25044990


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