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/cifs/dir.c b/fs/cifs/dir.c
index 521d841..c60133f0 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -715,13 +715,15 @@
return 0;
}
-static int cifs_ci_compare(struct dentry *dentry, struct qstr *a,
- struct qstr *b)
+static int cifs_ci_compare(const struct dentry *parent,
+ const struct inode *pinode,
+ const struct dentry *dentry, const struct inode *inode,
+ unsigned int len, const char *str, const struct qstr *name)
{
- struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
+ struct nls_table *codepage = CIFS_SB(pinode->i_sb)->local_nls;
- if ((a->len == b->len) &&
- (nls_strnicmp(codepage, a->name, b->name, a->len) == 0))
+ if ((name->len == len) &&
+ (nls_strnicmp(codepage, name->name, str, len) == 0))
return 0;
return 1;
}