Just use the generic anon_inode file system.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
drivers/gpu/drm/drm_drv.c | 64 ++-------------------------------------
1 file changed, 3 insertions(+), 61 deletions(-)
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 87e7214a8e3565..af293d76f979e5 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -26,6 +26,7 @@
* DEALINGS IN THE SOFTWARE.
*/
+#include <linux/anon_inodes.h>
#include <linux/debugfs.h>
#include <linux/fs.h>
#include <linux/module.h>
@@ -475,65 +476,6 @@ void drm_dev_unplug(struct drm_device *dev)
}
EXPORT_SYMBOL(drm_dev_unplug);
-/*
- * DRM internal mount
- * We want to be able to allocate our own "struct address_space" to control
- * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow
- * stand-alone address_space objects, so we need an underlying inode. As there
- * is no way to allocate an independent inode easily, we need a fake internal
- * VFS mount-point.
- *
- * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free()
- * frees it again. You are allowed to use iget() and iput() to get references to
- * the inode. But each drm_fs_inode_new() call must be paired with exactly one
- * drm_fs_inode_free() call (which does not have to be the last iput()).
- * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it
- * between multiple inode-users. You could, technically, call
- * iget() + drm_fs_inode_free() directly after alloc and sometime later do an
- * iput(), but this way you'd end up with a new vfsmount for each inode.
- */
-
-static int drm_fs_cnt;
-static struct vfsmount *drm_fs_mnt;
-
-static int drm_fs_init_fs_context(struct fs_context *fc)
-{
- return init_pseudo(fc, 0x010203ff) ? 0 : -ENOMEM;
-}
-
-static struct file_system_type drm_fs_type = {
- .name = "drm",
- .owner = THIS_MODULE,
- .init_fs_context = drm_fs_init_fs_context,
- .kill_sb = kill_anon_super,
-};
-
-static struct inode *drm_fs_inode_new(void)
-{
- struct inode *inode;
- int r;
-
- r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt);
- if (r < 0) {
- DRM_ERROR("Cannot mount pseudo fs: %d\n", r);
- return ERR_PTR(r);
- }
-
- inode = alloc_anon_inode_sb(drm_fs_mnt->mnt_sb);
- if (IS_ERR(inode))
- simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
-
- return inode;
-}
-
-static void drm_fs_inode_free(struct inode *inode)
-{
- if (inode) {
- iput(inode);
- simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
- }
-}
-
/**
* DOC: component helper usage recommendations
*
@@ -563,7 +505,7 @@ static void drm_dev_init_release(struct drm_device *dev, void *res)
{
drm_legacy_ctxbitmap_cleanup(dev);
drm_legacy_remove_map_hash(dev);
- drm_fs_inode_free(dev->anon_inode);
+ iput(dev->anon_inode);
put_device(dev->dev);
/* Prevent use-after-free in drm_managed_release when debugging is
@@ -616,7 +558,7 @@ static int drm_dev_init(struct drm_device *dev,
if (ret)
return ret;
- dev->anon_inode = drm_fs_inode_new();
+ dev->anon_inode = alloc_anon_inode();
if (IS_ERR(dev->anon_inode)) {
ret = PTR_ERR(dev->anon_inode);
DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret);
--
2.30.1
