Allow d_manage() to be used in RCU-walk mode

[mv-sheeva.git] / Documentation / filesystems / vfs.txt

diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 4682586b147a8495f7add164662c0d2dec928d7b..3c4b2f1b64d0dc787f14fbfe31c6bc5ad61e6a06 100644 (file)
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -865,7 +865,7 @@ struct dentry_operations {
        void (*d_iput)(struct dentry *, struct inode *);
        char *(*d_dname)(struct dentry *, char *, int);
        struct vfsmount *(*d_automount)(struct path *);
-       int (*d_manage)(struct dentry *, bool);
+       int (*d_manage)(struct dentry *, bool, bool);
 };
 
   d_revalidate: called when the VFS needs to revalidate a dentry. This
@@ -960,6 +960,11 @@ struct dentry_operations {
        held by the caller and the function should not initiate any mounts or
        unmounts that it will then wait for.
 
+       If the 'rcu_walk' parameter is true, then the caller is doing a
+       pathwalk in RCU-walk mode.  Sleeping is not permitted in this mode,
+       and the caller can be asked to leave it and call again by returing
+       -ECHILD.
+
        This function is only used if DCACHE_MANAGE_TRANSIT is set on the
        dentry being transited from.