X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Fanon_inodes.c;h=f42be069e085b2d212b8cc633d61f418be6801f5;hb=8a3227268877b81096d7b7a841aaf51099ad2068;hp=a260198306c21d589b9bc1bc237c9d6f8833ff14;hpb=489de30259e667d7bc47da9da44a0270b050cd97;p=linux-2.6

diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index a260198306..f42be069e0 100644
--- a/fs/anon_inodes.c
+++ b/fs/anon_inodes.c
@@ -76,25 +76,15 @@ int anon_inode_getfd(int *pfd, struct inode **pinode, struct file **pfile,
 {
 	struct qstr this;
 	struct dentry *dentry;
-	struct inode *inode;
 	struct file *file;
 	int error, fd;
 
 	if (IS_ERR(anon_inode_inode))
 		return -ENODEV;
-	file = get_empty_filp();
-	if (!file)
-		return -ENFILE;
-
-	inode = igrab(anon_inode_inode);
-	if (IS_ERR(inode)) {
-		error = PTR_ERR(inode);
-		goto err_put_filp;
-	}
 
 	error = get_unused_fd();
 	if (error < 0)
-		goto err_iput;
+		return error;
 	fd = error;
 
 	/*
@@ -108,37 +98,45 @@ int anon_inode_getfd(int *pfd, struct inode **pinode, struct file **pfile,
 	dentry = d_alloc(anon_inode_mnt->mnt_sb->s_root, &this);
 	if (!dentry)
 		goto err_put_unused_fd;
+
+	/*
+	 * We know the anon_inode inode count is always greater than zero,
+	 * so we can avoid doing an igrab() and we can use an open-coded
+	 * atomic_inc().
+	 */
+	atomic_inc(&anon_inode_inode->i_count);
+
 	dentry->d_op = &anon_inodefs_dentry_operations;
 	/* Do not publish this dentry inside the global dentry hash table */
 	dentry->d_flags &= ~DCACHE_UNHASHED;
-	d_instantiate(dentry, inode);
+	d_instantiate(dentry, anon_inode_inode);
 
-	file->f_path.mnt = mntget(anon_inode_mnt);
-	file->f_path.dentry = dentry;
-	file->f_mapping = inode->i_mapping;
+	error = -ENFILE;
+	file = alloc_file(anon_inode_mnt, dentry,
+			  FMODE_READ | FMODE_WRITE, fops);
+	if (!file)
+		goto err_dput;
+	file->f_mapping = anon_inode_inode->i_mapping;
 
 	file->f_pos = 0;
 	file->f_flags = O_RDWR;
-	file->f_op = fops;
-	file->f_mode = FMODE_READ | FMODE_WRITE;
 	file->f_version = 0;
 	file->private_data = priv;
 
 	fd_install(fd, file);
 
 	*pfd = fd;
-	*pinode = inode;
+	*pinode = anon_inode_inode;
 	*pfile = file;
 	return 0;
 
+err_dput:
+	dput(dentry);
 err_put_unused_fd:
 	put_unused_fd(fd);
-err_iput:
-	iput(inode);
-err_put_filp:
-	put_filp(file);
 	return error;
 }
+EXPORT_SYMBOL_GPL(anon_inode_getfd);
 
 /*
  * A single inode exists for all anon_inode files. Contrary to pipes,