convert mqueue

All modifications via normal VFS codepaths; just take care of making
persistent in in mqueue_create_attr() and discardable in mqueue_unlink()
and it doesn't need kill_litter_super() at all.

mqueue_unlink() side is best handled by having it call simple_unlink()
rather than duplicating its guts...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 093551fe66a7eb884fc34ef853a0ca92b95770af..5737130137bf4c11157d965204c69c0e6e72c6a4 100644 (file)
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -599,8 +599,7 @@ static int mqueue_create_attr(struct dentry *dentry, umode_t mode, void *arg)
        dir->i_size += DIRENT_SIZE;
        simple_inode_init_ts(dir);
 
-       d_instantiate(dentry, inode);
-       dget(dentry);
+       d_make_persistent(dentry, inode);
        return 0;
 out_unlock:
        spin_unlock(&mq_lock);
@@ -617,13 +616,8 @@ static int mqueue_create(struct mnt_idmap *idmap, struct inode *dir,
 
 static int mqueue_unlink(struct inode *dir, struct dentry *dentry)
 {
-       struct inode *inode = d_inode(dentry);
-
-       simple_inode_init_ts(dir);
        dir->i_size -= DIRENT_SIZE;
-       drop_nlink(inode);
-       dput(dentry);
-       return 0;
+       return simple_unlink(dir, dentry);
 }
 
 /*
@@ -1638,7 +1632,7 @@ static const struct fs_context_operations mqueue_fs_context_ops = {
 static struct file_system_type mqueue_fs_type = {
        .name                   = "mqueue",
        .init_fs_context        = mqueue_init_fs_context,
-       .kill_sb                = kill_litter_super,
+       .kill_sb                = kill_anon_super,
        .fs_flags               = FS_USERNS_MOUNT,
 };