fs: change d_compare for rcu-walk
Change d_compare so it may be called from lock-free RCU lookups. This
does put significant restrictions on what may be done from the callback,
however there don't seem to have been any problems with in-tree fses.
If some strange use case pops up that _really_ cannot cope with the
rcu-walk rules, we can just add new rcu-unaware callbacks, which would
cause name lookup to drop out of rcu-walk mode.
For in-tree filesystems, this is just a mechanical change.
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
diff --git a/fs/isofs/namei.c b/fs/isofs/namei.c
index 0d23abf..715f7d3 100644
--- a/fs/isofs/namei.c
+++ b/fs/isofs/namei.c
@@ -37,7 +37,8 @@
qstr.name = compare;
qstr.len = dlen;
- return dentry->d_op->d_compare(dentry, &dentry->d_name, &qstr);
+ return dentry->d_op->d_compare(NULL, NULL, NULL, NULL,
+ dentry->d_name.len, dentry->d_name.name, &qstr);
}
/*