* Can someone explain s_xattr field in the superblock?
@ 2011-05-31 18:23 Sam Gandhi
2011-05-31 18:47 ` Jan Kara
0 siblings, 1 reply; 2+ messages in thread
From: Sam Gandhi @ 2011-05-31 18:23 UTC (permalink / raw)
To: linux-fsdevel
Hello,
[ Sorry if this duplicate to some, I posted this message earlier to
linux-kernel probably was not appropriate ]
I have seen some file systems like jffs2/ext4 etc setup the s_xattr
field in the superblock structure.
But there are files systems that do not initialize s_xattr field in
the superblock.
Can someone kindly explain what functionality does s_xattr on super
block provides? What kinds of things file system wouldn't be able to
do if the superblock doesn't have this initialized?
Thanks.
-Sam
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Can someone explain s_xattr field in the superblock?
2011-05-31 18:23 Can someone explain s_xattr field in the superblock? Sam Gandhi
@ 2011-05-31 18:47 ` Jan Kara
0 siblings, 0 replies; 2+ messages in thread
From: Jan Kara @ 2011-05-31 18:47 UTC (permalink / raw)
To: Sam Gandhi; +Cc: linux-fsdevel
Hello,
On Tue 31-05-11 11:23:33, Sam Gandhi wrote:
> I have seen some file systems like jffs2/ext4 etc setup the s_xattr
> field in the superblock structure.
> But there are files systems that do not initialize s_xattr field in
> the superblock.
Only filesystems that support extended attributes setup s_xattr.
> Can someone kindly explain what functionality does s_xattr on super
> block provides? What kinds of things file system wouldn't be able to
> do if the superblock doesn't have this initialized?
It tells VFS what callbacks to call when user tries to obtain/change
extended attributes. If s_xattr is left at NULL, user will get EOPNOTSUPP
or similar error...
Honza
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR
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