fs: no games with DCACHE_UNHASHED

Filesystems outside the regular namespace do not have to clear DCACHE_UNHASHED
in order to have a working /proc/$pid/fd/XXX. Nothing in proc prevents the
fd link from being used if its dentry is not in the hash.

Also, it does not get put into the dcache hash if DCACHE_UNHASHED is clear;
that depends on the filesystem calling d_add or d_rehash.

So delete the misleading comments and needless code.

Acked-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 0 insertions, 13 deletions

diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index 01c529a3f7d2..2c994591f4d7 100644
--- a/fs/anon_inodes.c
+++ b/fs/anon_inodes.c
@@ -35,16 +35,6 @@ static int anon_inodefs_get_sb(struct file_system_type *fs_type, int flags,
                              mnt);
 }
 
-static int anon_inodefs_delete_dentry(struct dentry *dentry)
-{
-        /*
-         * We faked vfs to believe the dentry was hashed when we created it.
-         * Now we restore the flag so that dput() will work correctly.
-         */
-        dentry->d_flags |= DCACHE_UNHASHED;
-        return 1;
-}
-
 /*
  * anon_inodefs_dname() is called from d_path().
  */
@@ -60,7 +50,6 @@ static struct file_system_type anon_inode_fs_type = {
         .kill_sb        = kill_anon_super,
 };
 static const struct dentry_operations anon_inodefs_dentry_operations = {
-        .d_delete       = anon_inodefs_delete_dentry,
         .d_dname        = anon_inodefs_dname,
 };
 
@@ -129,8 +118,6 @@ struct file *anon_inode_getfile(const char *name,
         atomic_inc(&anon_inode_inode->i_count);
 
         path.dentry->d_op = &anon_inodefs_dentry_operations;
-        /* Do not publish this dentry inside the global dentry hash table */
-        path.dentry->d_flags &= ~DCACHE_UNHASHED;
         d_instantiate(path.dentry, anon_inode_inode);
 
         error = -ENFILE;