KVM: Remove kvmfs in favor of the anonymous inodes source

kvm uses a pseudo filesystem, kvmfs, to generate inodes, a job that the
new anonymous inodes source does much better.

Cc: Davide Libenzi <davidel@xmailserver.org>
Signed-off-by: Avi Kivity <avi@qumranet.com>

3 files changed, 12 insertions, 133 deletions

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 5603000573ec..26ca90f74fc7 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -43,6 +43,7 @@
 #include <linux/sched.h>
 #include <linux/cpumask.h>
 #include <linux/smp.h>
+#include <linux/anon_inodes.h>
 
 #include "x86_emulate.h"
 #include "segment_descriptor.h"
@@ -81,8 +82,6 @@ static struct kvm_stats_debugfs_item {
 
 static struct dentry *debugfs_dir;
 
-struct vfsmount *kvmfs_mnt;
-
 #define MAX_IO_MSRS 256
 
 #define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
@@ -104,55 +103,6 @@ struct segment_descriptor_64 {
 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
                            unsigned long arg);
 
-static struct inode *kvmfs_inode(struct file_operations *fops)
-{
-        int error = -ENOMEM;
-        struct inode *inode = new_inode(kvmfs_mnt->mnt_sb);
-
-        if (!inode)
-                goto eexit_1;
-
-        inode->i_fop = fops;
-
-        /*
-         * Mark the inode dirty from the very beginning,
-         * that way it will never be moved to the dirty
-         * list because mark_inode_dirty() will think
-         * that it already _is_ on the dirty list.
-         */
-        inode->i_state = I_DIRTY;
-        inode->i_mode = S_IRUSR | S_IWUSR;
-        inode->i_uid = current->fsuid;
-        inode->i_gid = current->fsgid;
-        inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
-        return inode;
-
-eexit_1:
-        return ERR_PTR(error);
-}
-
-static struct file *kvmfs_file(struct inode *inode, void *private_data)
-{
-        struct file *file = get_empty_filp();
-
-        if (!file)
-                return ERR_PTR(-ENFILE);
-
-        file->f_path.mnt = mntget(kvmfs_mnt);
-        file->f_path.dentry = d_alloc_anon(inode);
-        if (!file->f_path.dentry)
-                return ERR_PTR(-ENOMEM);
-        file->f_mapping = inode->i_mapping;
-
-        file->f_pos = 0;
-        file->f_flags = O_RDWR;
-        file->f_op = inode->i_fop;
-        file->f_mode = FMODE_READ | FMODE_WRITE;
-        file->f_version = 0;
-        file->private_data = private_data;
-        return file;
-}
-
 unsigned long segment_base(u16 selector)
 {
         struct descriptor_table gdt;
@@ -2413,34 +2363,12 @@ static int create_vcpu_fd(struct kvm_vcpu *vcpu)
         struct inode *inode;
         struct file *file;
 
+        r = anon_inode_getfd(&fd, &inode, &file,
+                             "kvm-vcpu", &kvm_vcpu_fops, vcpu);
+        if (r)
+                return r;
         atomic_inc(&vcpu->kvm->filp->f_count);
-        inode = kvmfs_inode(&kvm_vcpu_fops);
-        if (IS_ERR(inode)) {
-                r = PTR_ERR(inode);
-                goto out1;
-        }
-
-        file = kvmfs_file(inode, vcpu);
-        if (IS_ERR(file)) {
-                r = PTR_ERR(file);
-                goto out2;
-        }
-
-        r = get_unused_fd();
-        if (r < 0)
-                goto out3;
-        fd = r;
-        fd_install(fd, file);
-
         return fd;
-
-out3:
-        fput(file);
-out2:
-        iput(inode);
-out1:
-        fput(vcpu->kvm->filp);
-        return r;
 }
 
 /*
@@ -2905,41 +2833,18 @@ static int kvm_dev_ioctl_create_vm(void)
         struct file *file;
         struct kvm *kvm;
 
-        inode = kvmfs_inode(&kvm_vm_fops);
-        if (IS_ERR(inode)) {
-                r = PTR_ERR(inode);
-                goto out1;
-        }
-
         kvm = kvm_create_vm();
-        if (IS_ERR(kvm)) {
-                r = PTR_ERR(kvm);
-                goto out2;
+        if (IS_ERR(kvm))
+                return PTR_ERR(kvm);
+        r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
+        if (r) {
+                kvm_destroy_vm(kvm);
+                return r;
         }
 
-        file = kvmfs_file(inode, kvm);
-        if (IS_ERR(file)) {
-                r = PTR_ERR(file);
-                goto out3;
-        }
         kvm->filp = file;
 
-        r = get_unused_fd();
-        if (r < 0)
-                goto out4;
-        fd = r;
-        fd_install(fd, file);
-
         return fd;
-
-out4:
-        fput(file);
-out3:
-        kvm_destroy_vm(kvm);
-out2:
-        iput(inode);
-out1:
-        return r;
 }
 
 static long kvm_dev_ioctl(struct file *filp,
@@ -3211,18 +3116,6 @@ static struct sys_device kvm_sysdev = {
 
 hpa_t bad_page_address;
 
-static int kvmfs_get_sb(struct file_system_type *fs_type, int flags,
-                        const char *dev_name, void *data, struct vfsmount *mnt)
-{
-        return get_sb_pseudo(fs_type, "kvm:", NULL, KVMFS_SUPER_MAGIC, mnt);
-}
-
-static struct file_system_type kvm_fs_type = {
-        .name           = "kvmfs",
-        .get_sb         = kvmfs_get_sb,
-        .kill_sb        = kill_anon_super,
-};
-
 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
 {
         int r;
@@ -3307,14 +3200,6 @@ static __init int kvm_init(void)
         if (r)
                 goto out4;
 
-        r = register_filesystem(&kvm_fs_type);
-        if (r)
-                goto out3;
-
-        kvmfs_mnt = kern_mount(&kvm_fs_type);
-        r = PTR_ERR(kvmfs_mnt);
-        if (IS_ERR(kvmfs_mnt))
-                goto out2;
         kvm_init_debug();
 
         kvm_init_msr_list();
@@ -3331,10 +3216,6 @@ static __init int kvm_init(void)
 
 out:
         kvm_exit_debug();
-        mntput(kvmfs_mnt);
-out2:
-        unregister_filesystem(&kvm_fs_type);
-out3:
         kvm_mmu_module_exit();
 out4:
         return r;
@@ -3344,8 +3225,6 @@ static __exit void kvm_exit(void)
 {
         kvm_exit_debug();
         __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
-        mntput(kvmfs_mnt);
-        unregister_filesystem(&kvm_fs_type);
         kvm_mmu_module_exit();
 }
 
diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index 40fe3a3222e4..edc67486238f 100644
--- a/fs/anon_inodes.c
+++ b/fs/anon_inodes.c
@@ -139,6 +139,7 @@ err_put_filp:
         put_filp(file);
         return error;
 }
+EXPORT_SYMBOL_GPL(anon_inode_getfd);
 
 /*
  * A single inode exist for all anon_inode files. Contrary to pipes,
diff --git a/include/linux/magic.h b/include/linux/magic.h
index 9d713c03e3da..36cc20dfd142 100644
--- a/include/linux/magic.h
+++ b/include/linux/magic.h
@@ -13,7 +13,6 @@
 #define HPFS_SUPER_MAGIC        0xf995e849
 #define ISOFS_SUPER_MAGIC       0x9660
 #define JFFS2_SUPER_MAGIC       0x72b6
-#define KVMFS_SUPER_MAGIC       0x19700426
 #define ANON_INODE_FS_MAGIC     0x09041934
 
 #define MINIX_SUPER_MAGIC       0x137F          /* original minix fs */