linux-kernel - [PATCH 5/9] vmw_balloon: remove the balloon-vmware file system

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Message-Id: <20210309155348.974875-6-hch@lst.de>
Date:   Tue,  9 Mar 2021 16:53:44 +0100
From:   Christoph Hellwig <hch@....de>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Vetter <daniel@...ll.ch>, Nadav Amit <namit@...are.com>,
        "VMware, Inc." <pv-drivers@...are.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Minchan Kim <minchan@...nel.org>,
        Nitin Gupta <ngupta@...are.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH 5/9] vmw_balloon: remove the balloon-vmware file system

Just use the generic anon_inode file system.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/misc/vmw_balloon.c | 24 ++----------------------
 1 file changed, 2 insertions(+), 22 deletions(-)

diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
index 5d057a05ddbee8..be4be32f858253 100644
--- a/drivers/misc/vmw_balloon.c
+++ b/drivers/misc/vmw_balloon.c
@@ -16,6 +16,7 @@
 //#define DEBUG
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/anon_inodes.h>
 #include <linux/types.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
@@ -1735,20 +1736,6 @@ static inline void vmballoon_debugfs_exit(struct vmballoon *b)
 
 
 #ifdef CONFIG_BALLOON_COMPACTION
-
-static int vmballoon_init_fs_context(struct fs_context *fc)
-{
-	return init_pseudo(fc, BALLOON_VMW_MAGIC) ? 0 : -ENOMEM;
-}
-
-static struct file_system_type vmballoon_fs = {
-	.name           	= "balloon-vmware",
-	.init_fs_context	= vmballoon_init_fs_context,
-	.kill_sb        	= kill_anon_super,
-};
-
-static struct vfsmount *vmballoon_mnt;
-
 /**
  * vmballoon_migratepage() - migrates a balloon page.
  * @b_dev_info: balloon device information descriptor.
@@ -1878,8 +1865,6 @@ static void vmballoon_compaction_deinit(struct vmballoon *b)
 		iput(b->b_dev_info.inode);
 
 	b->b_dev_info.inode = NULL;
-	kern_unmount(vmballoon_mnt);
-	vmballoon_mnt = NULL;
 }
 
 /**
@@ -1895,13 +1880,8 @@ static void vmballoon_compaction_deinit(struct vmballoon *b)
  */
 static __init int vmballoon_compaction_init(struct vmballoon *b)
 {
-	vmballoon_mnt = kern_mount(&vmballoon_fs);
-	if (IS_ERR(vmballoon_mnt))
-		return PTR_ERR(vmballoon_mnt);
-
 	b->b_dev_info.migratepage = vmballoon_migratepage;
-	b->b_dev_info.inode = alloc_anon_inode_sb(vmballoon_mnt->mnt_sb);
-
+	b->b_dev_info.inode = alloc_anon_inode();
 	if (IS_ERR(b->b_dev_info.inode))
 		return PTR_ERR(b->b_dev_info.inode);
 
-- 
2.30.1