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Commit 049b3c10 authored by Al Viro's avatar Al Viro
Browse files

vfs: update documentation on ->i_dentry handling 



we used to need to clean it in RCU callback freeing an inode;
in 3.2 that requirement went away.  Unfortunately, it hadn't
been reflected in Documentation/filesystems/porting.

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 7968ce12

Documentation/filesystems/porting

+4 −6
Original line number Diff line number Diff line
@@ -355,12 +355,10 @@ protects *all* the dcache state of a given dentry. 
via rcu-walk path walk (basically, if the file can have had a path name in the

vfs namespace).



	i_dentry and i_rcu share storage in a union, and the vfs expects

i_dentry to be reinitialized before it is freed, so an:



  INIT_LIST_HEAD(&inode->i_dentry);



must be done in the RCU callback.

	Even though i_dentry and i_rcu share storage in a union, we will

initialize the former in inode_init_always(), so just leave it alone in

the callback.  It used to be necessary to clean it there, but not anymore

(starting at 3.2).



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