-/*
- * snap_current
+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
*
- * Copyright (C) 1998 Peter J. Braam
- * Copyright (C) 2000 Stelias Computing, Inc.
- * Copyright (C) 2000 Red Hat, Inc.
- * Copyright (C) 2000 Mountain View Data, Inc.
+ * lustre/smfs/super.c
+ * Lustre filesystem abstraction routines
*
- * Author: Peter J. Braam <braam@mountainviewdata.com>
+ * Copyright (C) 2004 Cluster File Systems, Inc.
+ *
+ * This file is part of Lustre, http://www.lustre.org.
+ *
+ * Lustre is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * Lustre is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Lustre; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+
#define DEBUG_SUBSYSTEM S_SM
#include <linux/config.h>
#include <linux/utime.h>
#include <linux/file.h>
#include <linux/slab.h>
+#include <linux/dcache.h>
#include <linux/loop.h>
#include <linux/errno.h>
-#include "smfs_internal.h"
-
-/* Find the options for the clone. These consist of a cache device
- and an index in the snaptable associated with that device.
-*/
-static char *smfs_options(char *options, char **devstr, char **namestr)
+#include <linux/obd_class.h>
+#include <linux/obd_support.h>
+#include <linux/lustre_lib.h>
+#include <linux/lustre_idl.h>
+#include <linux/lustre_fsfilt.h>
+#include <linux/lustre_smfs.h>
+#include "smfs_internal.h"
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
+static struct super_block *smfs_read_super(struct super_block *sb,
+ void *data, int silent)
{
- struct option *opt_value = NULL;
- char *pos;
-
- while (!(get_opt(&opt_value, &pos))) {
- if (!strcmp(opt_value->opt, "dev")) {
- if (devstr != NULL)
- *devstr = opt_value->value;
- } else if (!strcmp(opt_value->opt, "type")) {
- if (namestr != NULL)
- *namestr = opt_value->value;
- } else {
- break;
- }
- }
- return pos;
+ int err;
+
+ err = smfs_fill_super(sb, data, silent);
+ if (err)
+ return NULL;
+
+ return sb;
}
-static int get_fd(struct file *filp)
+
+static struct file_system_type smfs_type = {
+ .owner = THIS_MODULE,
+ .name = "smfs",
+ .read_super = smfs_read_super,
+};
+#else
+struct super_block *smfs_get_super(struct file_system_type *fs_type,
+ int flags, const char *dev_name,
+ void *data)
{
- struct files_struct *files = current->files;
- int fd = 0;
-
- write_lock(&files->file_lock);
- for (fd = 0; fd < files->max_fds; fd++) {
- if(files->fd[fd] == filp) {
- write_unlock(&files->file_lock);
- return fd;
- }
- }
- write_unlock(&files->file_lock);
- RETURN(-1);
+ return get_sb_nodev(fs_type, flags, data, smfs_fill_super);
}
-static int close_fd(int fd)
+
+void smfs_kill_super(struct super_block *sb)
{
- struct files_struct *files = current->files;
-
- write_lock(&files->file_lock);
-
- files->fd[fd] = NULL;
- __put_unused_fd(files, fd);
-
- write_unlock(&files->file_lock);
- return 0;
+ kill_anon_super(sb);
}
-#define MAX_LOOP_DEVICES 256
-static char *parse_path2dev(struct super_block *sb, char *dev_path)
+static struct file_system_type smfs_type = {
+ .owner = THIS_MODULE,
+ .name = "smfs",
+ .get_sb = smfs_get_super,
+ .kill_sb = smfs_kill_super,
+};
+#endif
+
+static int cleanup_smfs(void)
{
- struct file *filp;
- int i = 0, fd = 0, error = 0;
- char *name = NULL;
-
- filp = filp_open(dev_path, 0, 0);
- if (!filp)
- RETURN(NULL);
- if (S_ISREG(filp->f_dentry->d_inode->i_mode)) {
- /*here we must walk through all the snap cache to
- *find the loop device */
-
- fd = get_unused_fd();
- if (!fd) RETURN(NULL);
+ int err = 0;
- fd_install(fd, filp);
- SM_ALLOC(name, strlen("/dev/loop/") + 2);
-
- for (i = 0; i < MAX_LOOP_DEVICES; i++) {
- fd = get_fd(filp);
- if (fd > 0) {
- struct block_device_operations *bd_ops;
- struct dentry *dentry;
- struct nameidata nd;
- /*FIXME later, the loop file should
- *be different for different system*/
-
- sprintf(name, "/dev/loop/%d", i);
-
- if (path_init(name, LOOKUP_FOLLOW, &nd)) {
- error = path_walk(name, &nd);
- if (error) {
- path_release(&nd);
- SM_FREE(name, sizeof(name) + 1);
- RETURN(NULL);
- }
- } else {
- SM_FREE(name, sizeof(name) + 1);
- RETURN(NULL);
- }
- dentry = nd.dentry;
- bd_ops = get_blkfops(LOOP_MAJOR);
- error = bd_ops->ioctl(dentry->d_inode,
- filp, LOOP_SET_FD,
- (unsigned long)fd);
- path_release(&nd);
- if (!error) {
- filp_close(filp, current->files);
- RETURN(name);
- }
- }
- }
- }
- SM_ALLOC(name, strlen(dev_path) + 1);
- memcpy(name, dev_path, strlen(dev_path) + 1);
- filp_close(filp, current->files);
- RETURN(name);
+ err = unregister_filesystem(&smfs_type);
+ if (err)
+ CERROR("unregister_filesystem() failed, rc = %d\n", err);
+ return 0;
}
-extern struct super_operations smfs_super_ops;
-static int sm_mount_cache(struct super_block *sb,
- char *devstr,
- char *typestr)
+static int init_smfs(void)
{
- struct vfsmount *mnt;
- struct smfs_super_info *smb;
- char *dev_name = NULL;
- unsigned long page;
- int err = 0;
-
- dev_name = parse_path2dev(sb, devstr);
- if (!dev_name) {
- GOTO(err_out, err = -ENOMEM);
- }
- if (!(page = __get_free_page(GFP_KERNEL))) {
- GOTO(err_out, err = -ENOMEM);
- }
- memset((void *)page, 0, PAGE_SIZE);
- sprintf((char *)page, "iopen_nopriv");
-
- mnt = do_kern_mount(typestr, 0, dev_name, (void *)page);
- free_page(page);
-
- if (IS_ERR(mnt)) {
- CERROR("do_kern_mount failed: rc = %d\n", err);
- GOTO(err_out, 0);
- }
- smb = S2SMI(sb);
- smb->smsi_sb = mnt->mnt_sb;
- smb->smsi_mnt = mnt;
- sm_set_sb_ops(mnt->mnt_sb, sb);
-err_out:
- if (dev_name)
- SM_FREE(dev_name, strlen(dev_name) + 2);
-
- return err;
-}
-static int sm_umount_cache(struct super_block *sb)
-{
- struct smfs_super_info *smb = S2SMI(sb);
-
- mntput(smb->smsi_mnt);
- return 0;
-}
-void smfs_put_super(struct super_block *sb)
-{
- if (sb)
- sm_umount_cache(sb);
- return;
+ int err;
+
+ err = register_filesystem(&smfs_type);
+ if (err)
+ CERROR("register_filesystem() failed, rc = %d\n", err);
+ return err;
}
-struct super_block *
-smfs_read_super(
- struct super_block *sb,
- void *data,
- int silent)
+static int __init smfs_init(void)
{
- struct smfs_inode_info *smi;
- struct dentry *bottom_root;
- struct inode *root_inode = NULL;
- char *devstr = NULL, *typestr = NULL;
- char *cache_data;
- ino_t root_ino;
- int err = 0;
-
- ENTRY;
+ int err;
- CDEBUG(D_SUPER, "mount opts: %s\n", data ? (char *)data : "(none)");
-
- init_option(data);
- /* read and validate options */
- cache_data = smfs_options(data, &devstr, &typestr);
- if (*cache_data) {
- CERROR("invalid mount option %s\n", (char*)data);
- GOTO(out_err, err=-EINVAL);
- }
- if (!typestr || !devstr) {
- CERROR("mount options name and dev mandatory\n");
- GOTO(out_err, err=-EINVAL);
- }
-
- err = sm_mount_cache(sb, devstr, typestr);
- if (err) {
- CERROR("Can not mount %s as %s\n", devstr, typestr);
- GOTO(out_err, 0);
- }
- /* set up the super block */
+ if ( (err = init_smfs_psdev()) ) {
+ printk("Error initializing smfs_psdev, %d\n", err);
+ return -EINVAL;
+ }
- bottom_root = dget(S2SMI(sb)->smsi_sb->s_root);
- if (!bottom_root) {
- CERROR("bottom not mounted\n");
- GOTO(out_err, err=-ENOENT);
+ if ( (err = init_smfs()) ) {
+ printk("Error initializing smfs, %d\n", err);
+ return -EINVAL;
}
- root_ino = bottom_root->d_inode->i_ino;
- smi = I2SMI(root_inode);
- /*FIXME Intialize smi here*/
-
- CDEBUG(D_SUPER, "readinode %p, root ino %ld, root inode at %p\n",
- sb->s_op->read_inode, root_ino, root_inode);
-
- sb->s_root = d_alloc_root(bottom_root->d_inode);
-
- if (!sb->s_root) {
- GOTO(out_err, err=-EINVAL);
- }
+ if ( (err = init_smfs_proc_sys()) ) {
+ printk("Error initializing smfs proc sys, %d\n", err);
+ return -EINVAL;
+ }
- CDEBUG(D_SUPER, "sb %lx, &sb->u.generic_sbp: %lx\n",
- (ulong) sb, (ulong) &sb->u.generic_sbp);
-
- out_err:
- cleanup_option();
- if (err)
- return NULL;
- return sb;
+ return 0;
}
-static DECLARE_FSTYPE(smfs_type, "smfs", smfs_read_super, 0);
-
-int init_smfs(void)
+static void __exit smfs_cleanup(void)
{
- int err = 0;
-
- err = register_filesystem(&smfs_type);
- if (err) {
- CERROR("smfs: failed in register Storage Management filesystem!\n");
- }
- init_smfs_cache();
- return err;
+ cleanup_smfs();
+ smfs_cleanup_psdev();
}
-int cleanup_smfs(void)
-{
- int err = 0;
+MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
+MODULE_DESCRIPTION("Smfs file system filters v0.01");
+MODULE_LICENSE("GPL");
- ENTRY;
- err = unregister_filesystem(&smfs_type);
- if (err) {
- CERROR("smfs: failed to unregister Storage Management filesystem!\n");
- }
- cleanup_smfs_cache();
- return 0;
-}
+module_init(smfs_init);
+module_exit(smfs_cleanup);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff