Check the created directory inode for aliases in the mkdir() method.
Signed-off-by: Miklos Szeredi <[email protected]>
---
Index: linux/fs/fuse/dir.c
===================================================================
--- linux.orig/fs/fuse/dir.c 2005-11-28 14:01:08.000000000 +0100
+++ linux/fs/fuse/dir.c 2005-11-28 14:01:52.000000000 +0100
@@ -74,6 +74,19 @@ static int fuse_dentry_revalidate(struct
return 1;
}
+static int dir_alias(struct inode *inode)
+{
+ if (S_ISDIR(inode->i_mode)) {
+ /* Don't allow creating an alias to a directory */
+ struct dentry *alias = d_find_alias(inode);
+ if (alias) {
+ dput(alias);
+ return 1;
+ }
+ }
+ return 0;
+}
+
static struct dentry_operations fuse_dentry_operations = {
.d_revalidate = fuse_dentry_revalidate,
};
@@ -263,7 +276,7 @@ static int create_new_entry(struct fuse_
fuse_put_request(fc, req);
/* Don't allow userspace to do really stupid things... */
- if ((inode->i_mode ^ mode) & S_IFMT) {
+ if (((inode->i_mode ^ mode) & S_IFMT) || dir_alias(inode)) {
iput(inode);
return -EIO;
}
@@ -874,14 +887,9 @@ static struct dentry *fuse_lookup(struct
err = fuse_lookup_iget(dir, entry, &inode);
if (err)
return ERR_PTR(err);
- if (inode && S_ISDIR(inode->i_mode)) {
- /* Don't allow creating an alias to a directory */
- struct dentry *alias = d_find_alias(inode);
- if (alias) {
- dput(alias);
- iput(inode);
- return ERR_PTR(-EIO);
- }
+ if (inode && dir_alias(inode)) {
+ iput(inode);
+ return ERR_PTR(-EIO);
}
d_add(entry, inode);
return NULL;
-
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