[PATCH] new helper: d_obtain_alias
The calling conventions of d_alloc_anon are rather unfortunate for all
users, and it's name is not very descriptive either.
Add d_obtain_alias as a new exported helper that drops the inode
reference in the failure case, too and allows to pass-through NULL
pointers and inodes to allow for tail-calls in the export operations.
Incidentally this helper already existed as a private function in
libfs.c as exportfs_d_alloc so kill that one and switch the callers
to d_obtain_alias.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/libfs.c b/fs/libfs.c
index 1add676..7468859 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -732,28 +732,6 @@
return ret;
}
-/*
- * This is what d_alloc_anon should have been. Once the exportfs
- * argument transition has been finished I will update d_alloc_anon
- * to this prototype and this wrapper will go away. --hch
- */
-static struct dentry *exportfs_d_alloc(struct inode *inode)
-{
- struct dentry *dentry;
-
- if (!inode)
- return NULL;
- if (IS_ERR(inode))
- return ERR_PTR(PTR_ERR(inode));
-
- dentry = d_alloc_anon(inode);
- if (!dentry) {
- iput(inode);
- dentry = ERR_PTR(-ENOMEM);
- }
- return dentry;
-}
-
/**
* generic_fh_to_dentry - generic helper for the fh_to_dentry export operation
* @sb: filesystem to do the file handle conversion on
@@ -782,7 +760,7 @@
break;
}
- return exportfs_d_alloc(inode);
+ return d_obtain_alias(inode);
}
EXPORT_SYMBOL_GPL(generic_fh_to_dentry);
@@ -815,7 +793,7 @@
break;
}
- return exportfs_d_alloc(inode);
+ return d_obtain_alias(inode);
}
EXPORT_SYMBOL_GPL(generic_fh_to_parent);