Can someone explain s_xattr field in the superblock?

[Sam Gandhi]

Hello,

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
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