v4.19.13 snapshot.
diff --git a/fs/coda/inode.c b/fs/coda/inode.c
new file mode 100644
index 0000000..97424cf
--- /dev/null
+++ b/fs/coda/inode.c
@@ -0,0 +1,332 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Super block/filesystem wide operations
+ *
+ * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and
+ * Michael Callahan <callahan@maths.ox.ac.uk>
+ *
+ * Rewritten for Linux 2.1. Peter Braam <braam@cs.cmu.edu>
+ * Copyright (C) Carnegie Mellon University
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/unistd.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/file.h>
+#include <linux/vfs.h>
+#include <linux/slab.h>
+#include <linux/pid_namespace.h>
+#include <linux/uaccess.h>
+#include <linux/fs.h>
+#include <linux/vmalloc.h>
+
+#include <linux/coda.h>
+#include <linux/coda_psdev.h>
+#include "coda_linux.h"
+#include "coda_cache.h"
+
+#include "coda_int.h"
+
+/* VFS super_block ops */
+static void coda_evict_inode(struct inode *);
+static void coda_put_super(struct super_block *);
+static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);
+
+static struct kmem_cache * coda_inode_cachep;
+
+static struct inode *coda_alloc_inode(struct super_block *sb)
+{
+ struct coda_inode_info *ei;
+ ei = kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
+ if (!ei)
+ return NULL;
+ memset(&ei->c_fid, 0, sizeof(struct CodaFid));
+ ei->c_flags = 0;
+ ei->c_uid = GLOBAL_ROOT_UID;
+ ei->c_cached_perm = 0;
+ spin_lock_init(&ei->c_lock);
+ return &ei->vfs_inode;
+}
+
+static void coda_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ kmem_cache_free(coda_inode_cachep, ITOC(inode));
+}
+
+static void coda_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, coda_i_callback);
+}
+
+static void init_once(void *foo)
+{
+ struct coda_inode_info *ei = (struct coda_inode_info *) foo;
+
+ inode_init_once(&ei->vfs_inode);
+}
+
+int __init coda_init_inodecache(void)
+{
+ coda_inode_cachep = kmem_cache_create("coda_inode_cache",
+ sizeof(struct coda_inode_info), 0,
+ SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
+ SLAB_ACCOUNT, init_once);
+ if (coda_inode_cachep == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+void coda_destroy_inodecache(void)
+{
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
+ kmem_cache_destroy(coda_inode_cachep);
+}
+
+static int coda_remount(struct super_block *sb, int *flags, char *data)
+{
+ sync_filesystem(sb);
+ *flags |= SB_NOATIME;
+ return 0;
+}
+
+/* exported operations */
+static const struct super_operations coda_super_operations =
+{
+ .alloc_inode = coda_alloc_inode,
+ .destroy_inode = coda_destroy_inode,
+ .evict_inode = coda_evict_inode,
+ .put_super = coda_put_super,
+ .statfs = coda_statfs,
+ .remount_fs = coda_remount,
+};
+
+static int get_device_index(struct coda_mount_data *data)
+{
+ struct fd f;
+ struct inode *inode;
+ int idx;
+
+ if (data == NULL) {
+ pr_warn("%s: Bad mount data\n", __func__);
+ return -1;
+ }
+
+ if (data->version != CODA_MOUNT_VERSION) {
+ pr_warn("%s: Bad mount version\n", __func__);
+ return -1;
+ }
+
+ f = fdget(data->fd);
+ if (!f.file)
+ goto Ebadf;
+ inode = file_inode(f.file);
+ if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
+ fdput(f);
+ goto Ebadf;
+ }
+
+ idx = iminor(inode);
+ fdput(f);
+
+ if (idx < 0 || idx >= MAX_CODADEVS) {
+ pr_warn("%s: Bad minor number\n", __func__);
+ return -1;
+ }
+
+ return idx;
+Ebadf:
+ pr_warn("%s: Bad file\n", __func__);
+ return -1;
+}
+
+static int coda_fill_super(struct super_block *sb, void *data, int silent)
+{
+ struct inode *root = NULL;
+ struct venus_comm *vc;
+ struct CodaFid fid;
+ int error;
+ int idx;
+
+ if (task_active_pid_ns(current) != &init_pid_ns)
+ return -EINVAL;
+
+ idx = get_device_index((struct coda_mount_data *) data);
+
+ /* Ignore errors in data, for backward compatibility */
+ if(idx == -1)
+ idx = 0;
+
+ pr_info("%s: device index: %i\n", __func__, idx);
+
+ vc = &coda_comms[idx];
+ mutex_lock(&vc->vc_mutex);
+
+ if (!vc->vc_inuse) {
+ pr_warn("%s: No pseudo device\n", __func__);
+ error = -EINVAL;
+ goto unlock_out;
+ }
+
+ if (vc->vc_sb) {
+ pr_warn("%s: Device already mounted\n", __func__);
+ error = -EBUSY;
+ goto unlock_out;
+ }
+
+ vc->vc_sb = sb;
+ mutex_unlock(&vc->vc_mutex);
+
+ sb->s_fs_info = vc;
+ sb->s_flags |= SB_NOATIME;
+ sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
+ sb->s_blocksize_bits = 12;
+ sb->s_magic = CODA_SUPER_MAGIC;
+ sb->s_op = &coda_super_operations;
+ sb->s_d_op = &coda_dentry_operations;
+
+ error = super_setup_bdi(sb);
+ if (error)
+ goto error;
+
+ /* get root fid from Venus: this needs the root inode */
+ error = venus_rootfid(sb, &fid);
+ if ( error ) {
+ pr_warn("%s: coda_get_rootfid failed with %d\n",
+ __func__, error);
+ goto error;
+ }
+ pr_info("%s: rootfid is %s\n", __func__, coda_f2s(&fid));
+
+ /* make root inode */
+ root = coda_cnode_make(&fid, sb);
+ if (IS_ERR(root)) {
+ error = PTR_ERR(root);
+ pr_warn("Failure of coda_cnode_make for root: error %d\n",
+ error);
+ goto error;
+ }
+
+ pr_info("%s: rootinode is %ld dev %s\n",
+ __func__, root->i_ino, root->i_sb->s_id);
+ sb->s_root = d_make_root(root);
+ if (!sb->s_root) {
+ error = -EINVAL;
+ goto error;
+ }
+ return 0;
+
+error:
+ mutex_lock(&vc->vc_mutex);
+ vc->vc_sb = NULL;
+ sb->s_fs_info = NULL;
+unlock_out:
+ mutex_unlock(&vc->vc_mutex);
+ return error;
+}
+
+static void coda_put_super(struct super_block *sb)
+{
+ struct venus_comm *vcp = coda_vcp(sb);
+ mutex_lock(&vcp->vc_mutex);
+ vcp->vc_sb = NULL;
+ sb->s_fs_info = NULL;
+ mutex_unlock(&vcp->vc_mutex);
+
+ pr_info("Bye bye.\n");
+}
+
+static void coda_evict_inode(struct inode *inode)
+{
+ truncate_inode_pages_final(&inode->i_data);
+ clear_inode(inode);
+ coda_cache_clear_inode(inode);
+}
+
+int coda_getattr(const struct path *path, struct kstat *stat,
+ u32 request_mask, unsigned int flags)
+{
+ int err = coda_revalidate_inode(d_inode(path->dentry));
+ if (!err)
+ generic_fillattr(d_inode(path->dentry), stat);
+ return err;
+}
+
+int coda_setattr(struct dentry *de, struct iattr *iattr)
+{
+ struct inode *inode = d_inode(de);
+ struct coda_vattr vattr;
+ int error;
+
+ memset(&vattr, 0, sizeof(vattr));
+
+ inode->i_ctime = current_time(inode);
+ coda_iattr_to_vattr(iattr, &vattr);
+ vattr.va_type = C_VNON; /* cannot set type */
+
+ /* Venus is responsible for truncating the container-file!!! */
+ error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
+
+ if (!error) {
+ coda_vattr_to_iattr(inode, &vattr);
+ coda_cache_clear_inode(inode);
+ }
+ return error;
+}
+
+const struct inode_operations coda_file_inode_operations = {
+ .permission = coda_permission,
+ .getattr = coda_getattr,
+ .setattr = coda_setattr,
+};
+
+static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ int error;
+
+ error = venus_statfs(dentry, buf);
+
+ if (error) {
+ /* fake something like AFS does */
+ buf->f_blocks = 9000000;
+ buf->f_bfree = 9000000;
+ buf->f_bavail = 9000000;
+ buf->f_files = 9000000;
+ buf->f_ffree = 9000000;
+ }
+
+ /* and fill in the rest */
+ buf->f_type = CODA_SUPER_MAGIC;
+ buf->f_bsize = 4096;
+ buf->f_namelen = CODA_MAXNAMLEN;
+
+ return 0;
+}
+
+/* init_coda: used by filesystems.c to register coda */
+
+static struct dentry *coda_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return mount_nodev(fs_type, flags, data, coda_fill_super);
+}
+
+struct file_system_type coda_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "coda",
+ .mount = coda_mount,
+ .kill_sb = kill_anon_super,
+ .fs_flags = FS_BINARY_MOUNTDATA,
+};
+MODULE_ALIAS_FS("coda");
+