-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
+/*
+ * snap_current
*
- * 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.
+ * 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.
*
+ * Author: Peter J. Braam <braam@mountainviewdata.com>
*/
-
#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 <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"
+#include "smfs_internal.h"
-static char *smfs_options(char *data, char **devstr, char **namestr,
- int *kml, int *cache, char **opts,
- int *iopen_nopriv)
+/* 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, int *kml)
{
- char *pos;
- struct option *opt_value = NULL;
-
- 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 if (!strcmp(opt_value->opt, "kml")) {
- if (kml)
- *kml = 1;
- } else if (!strcmp(opt_value->opt, "cache")) {
- if (cache)
- *cache = 1;
- } else if (!strcmp(opt_value->opt, "options")) {
- if (opts != NULL)
- *opts = opt_value->value;
- } else if (!strcmp(opt_value->opt, "iopen_nopriv")) {
- if (iopen_nopriv != NULL)
- *iopen_nopriv = 1;
- } else {
- break;
- }
- }
- return pos;
+ 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 if (!strcmp(opt_value->opt, "kml")) {
+ *kml = 1;
+ } else {
+ break;
+ }
+ }
+ return pos;
}
-struct vfsmount *get_vfsmount(struct super_block *sb)
+static int set_loop_fd(char *dev_path, char *loop_dev)
{
- struct vfsmount *rootmnt, *mnt, *ret = NULL;
- struct list_head *end, *list;
-
- rootmnt = mntget(current->fs->rootmnt);
- end = list = &rootmnt->mnt_list;
- do {
- mnt = list_entry(list, struct vfsmount, mnt_list);
- if (mnt->mnt_sb == sb) {
- ret = mnt;
- break;
- }
- list = list->next;
- } while (end != list);
-
- mntput(current->fs->rootmnt);
- return ret;
+ struct loop_info loopinfo;
+ struct nameidata nd;
+ struct dentry *dentry;
+ struct block_device_operations *bd_ops;
+ struct file *filp;
+ int fd = 0, error = 0;
+
+ fd = get_unused_fd();
+
+ if (!fd) RETURN(-EINVAL);
+
+ filp = filp_open(dev_path, FMODE_WRITE, 0);
+ if (!filp || !S_ISREG(filp->f_dentry->d_inode->i_mode))
+ RETURN(-EINVAL);
+
+ fd_install(fd, filp);
+
+ if (path_init(loop_dev, LOOKUP_FOLLOW, &nd)) {
+ error = path_walk(loop_dev, &nd);
+ if (error) {
+ path_release(&nd);
+ filp_close(filp, current->files);
+ RETURN(-EINVAL);
+ }
+ } else {
+ path_release(&nd);
+ filp_close(filp, current->files);
+ RETURN(-EINVAL);
+ }
+ dentry = nd.dentry;
+ bd_ops = get_blkfops(LOOP_MAJOR);
+
+ error = bd_ops->ioctl(dentry->d_inode, filp, LOOP_SET_FD,
+ (unsigned long)fd);
+ if (error) {
+ path_release(&nd);
+ filp_close(filp, current->files);
+ RETURN(-EINVAL);
+ }
+ memset(&loopinfo, 0, sizeof(struct loop_info));
+
+ error = bd_ops->ioctl(dentry->d_inode, filp, LOOP_SET_STATUS,
+ (unsigned long)(&loopinfo));
+ path_release(&nd);
+ RETURN(error);
}
-struct super_block *smfs_get_sb_by_path(char *path, int len)
+#define SIZE(a) (sizeof(a)/sizeof(a[0]))
+static char *find_unused_and_set_loop_device(char *dev_path)
{
- struct super_block *sb;
- struct nameidata nd;
- int error = 0;
-
- ENTRY;
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
- if (path_init(path, LOOKUP_FOLLOW, &nd)) {
-#else
- if (path_lookup(path, LOOKUP_FOLLOW, &nd)) {
-#endif
- error = path_walk(path, &nd);
- if (error) {
- path_release(&nd);
- RETURN(NULL);
- }
- } else {
- RETURN(NULL);
- }
-
- /* FIXME-WANGDI: add some check code here. */
- sb = nd.dentry->d_sb;
- path_release(&nd);
- RETURN(sb);
+ char *loop_formats[] = { "/dev/loop/%d", "/dev/loop%d"};
+ struct loop_info loopinfo;
+ struct nameidata nd;
+ struct dentry *dentry;
+ char *dev = NULL;
+ int i, j, error;
+
+ for (j = 0; j < SIZE(loop_formats); j++) {
+ SM_ALLOC(dev, strlen(loop_formats[i]) + 1);
+ for(i = 0; i < 256; i++) {
+ struct block_device_operations *bd_ops;
+
+ sprintf(dev, loop_formats[j], i);
+
+ if (path_init(dev, LOOKUP_FOLLOW, &nd)) {
+ error = path_walk(dev, &nd);
+ if (error && error != -ENOENT) {
+ path_release(&nd);
+ SM_FREE(dev, strlen(loop_formats[i]) + 1);
+ RETURN(NULL);
+ }
+ } else {
+ SM_FREE(dev, strlen(loop_formats[i]) + 1);
+ RETURN(NULL);
+ }
+ dentry = nd.dentry;
+ bd_ops = get_blkfops(LOOP_MAJOR);
+ error = bd_ops->ioctl(dentry->d_inode, NULL, LOOP_GET_STATUS,
+ (unsigned long)&loopinfo);
+ path_release(&nd);
+
+ if (error == -ENXIO) {
+ /*find unused loop and set dev_path to loopdev*/
+ error = set_loop_fd(dev_path, dev);
+ if (error) {
+ SM_FREE(dev, strlen(loop_formats[i]) + 1);
+ dev = NULL;
+ }
+ return dev;/* probably free */
+ }
+ }
+ SM_FREE(dev, strlen(loop_formats[i]) + 1);
+ }
+ RETURN(NULL);
}
-static int smfs_init_fsfilt_ops(struct super_block *sb)
+#define MAX_LOOP_DEVICES 256
+static char *parse_path2dev(struct super_block *sb, char *dev_path)
{
- ENTRY;
- if (!S2SMI(sb)->sm_cache_fsfilt) {
- S2SMI(sb)->sm_cache_fsfilt =
- fsfilt_get_ops(S2SMI(sb)->cache_fs_type);
- if (!S2SMI(sb)->sm_cache_fsfilt) {
- CERROR("Can not get %s fsfilt ops needed by kml\n",
- S2SMI(sb)->cache_fs_type);
- RETURN(-EINVAL);
- }
- }
- if (!S2SMI(sb)->sm_fsfilt) {
- S2SMI(sb)->sm_fsfilt =
- fsfilt_get_ops(S2SMI(sb)->fs_type);
- if (!S2SMI(sb)->sm_fsfilt) {
- CERROR("Can not get %s fsfilt ops needed by kml\n",
- S2SMI(sb)->fs_type);
- RETURN(-EINVAL);
- }
- }
- RETURN(0);
+ struct dentry *dentry;
+ struct nameidata nd;
+ char *name = NULL;
+ int error = 0;
+
+ if (path_init(dev_path, LOOKUP_FOLLOW, &nd)) {
+ error = path_walk(dev_path, &nd);
+ if (error) {
+ path_release(&nd);
+ RETURN(NULL);
+ }
+ } else {
+ RETURN(NULL);
+ }
+ dentry = nd.dentry;
+
+ if (!dentry->d_inode || is_bad_inode(dentry->d_inode) ||
+ (!S_ISBLK(dentry->d_inode->i_mode) &&
+ !S_ISREG(dentry->d_inode->i_mode))){
+ path_release(&nd);
+ RETURN(NULL);
+ }
+
+ if (S_ISREG(dentry->d_inode->i_mode)) {
+ name = find_unused_and_set_loop_device(dev_path);
+ path_release(&nd);
+ RETURN(name);
+ }
+ SM_ALLOC(name, strlen(dev_path) + 1);
+ memcpy(name, dev_path, strlen(dev_path) + 1);
+ RETURN(name);
}
-
-void smfs_cleanup_fsfilt_ops(struct super_block *sb)
+void duplicate_sb(struct super_block *csb,
+ struct super_block *sb)
{
- if (S2SMI(sb)->sm_cache_fsfilt)
- fsfilt_put_ops(S2SMI(sb)->sm_cache_fsfilt);
- if (S2SMI(sb)->sm_fsfilt)
- fsfilt_put_ops(S2SMI(sb)->sm_fsfilt);
+ sb->s_blocksize = csb->s_blocksize;
+ sb->s_magic = csb->s_magic;
+ sb->s_blocksize_bits = csb->s_blocksize_bits;
+ sb->s_maxbytes = csb->s_maxbytes;
}
+extern struct super_operations smfs_super_ops;
-static int sm_mount_cache(struct super_block *sb, char *devstr,
- char *typestr, char *opts, int iopen_nopriv)
+static int sm_mount_cache(struct super_block *sb,
+ char *devstr,
+ char *typestr)
{
- struct smfs_super_info *smb;
- int err = 0, typelen;
- struct vfsmount *mnt;
- unsigned long page;
-
- ENTRY;
-
- typelen = strlen(typestr);
-
- page = __get_free_page(GFP_KERNEL);
- if (!page)
- GOTO(err_out, err = -ENOMEM);
-
+ 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);
-
- if (iopen_nopriv)
- sprintf((char *)page, "iopen_nopriv");
-
- if (opts && strlen(opts)) {
- int n = strlen((char *)page);
- sprintf((char *)page + n, ",%s", opts);
- }
-
- printk("smfs: mounting %s at %s\n", typestr, devstr);
-
- mnt = do_kern_mount(typestr, 0, devstr, (void *)page);
+ sprintf((char *)page, "iopen_nopriv");
+
+ mnt = do_kern_mount(typestr, 0, dev_name, (void *)page);
free_page(page);
-
- if (IS_ERR(mnt)) {
+
+ if (IS_ERR(mnt)) {
CERROR("do_kern_mount failed: rc = %ld\n", PTR_ERR(mnt));
GOTO(err_out, err = PTR_ERR(mnt));
}
- smb = S2SMI(sb);
- smb->smsi_sb = mnt->mnt_sb;
- smb->smsi_mnt = mnt;
-
- smfs_init_sm_ops(smb);
-
- OBD_ALLOC(smb->cache_fs_type, strlen(typestr) + 1);
- memcpy(smb->cache_fs_type, typestr, strlen(typestr));
-
- OBD_ALLOC(smb->fs_type, strlen(SMFS_TYPE) + 1);
- memcpy(smb->fs_type, SMFS_TYPE, strlen(SMFS_TYPE));
-
- duplicate_sb(sb, mnt->mnt_sb);
- sm_set_sb_ops(mnt->mnt_sb, sb);
- err = smfs_init_fsfilt_ops(sb);
+ smb = S2SMI(sb);
+ smb->smsi_sb = mnt->mnt_sb;
+ smb->smsi_mnt = mnt;
+
+ duplicate_sb(mnt->mnt_sb, sb);
+ sm_set_sb_ops(mnt->mnt_sb, sb);
err_out:
- return err;
+ 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);
- smfs_cleanup_sm_ops(smb);
- smfs_cleanup_fsfilt_ops(sb);
-
- if (smb->cache_fs_type)
- OBD_FREE(smb->cache_fs_type, strlen(smb->cache_fs_type) + 1);
-
- if (smb->fs_type)
- OBD_FREE(smb->fs_type, strlen(smb->fs_type) + 1);
-
- return 0;
+ struct smfs_super_info *smb = S2SMI(sb);
+
+ mntput(smb->smsi_mnt);
+
+ return 0;
}
-
void smfs_put_super(struct super_block *sb)
{
- if (SMFS_CACHE_HOOK(S2SMI(sb)))
- cache_space_hook_exit(sb);
-
- if (SMFS_DO_REC(S2SMI(sb)))
- smfs_rec_cleanup(sb);
-
- if (sb)
- sm_umount_cache(sb);
- return;
+ if (sb)
+ sm_umount_cache(sb);
+ return;
}
-static int smfs_fill_super(struct super_block *sb,
- void *data, int silent)
+struct super_block *
+smfs_read_super(
+ struct super_block *sb,
+ void *data,
+ int silent)
{
- ino_t root_ino;
- char *cache_data;
-
- int iopen_nopriv = 0;
- struct inode *root_inode = NULL;
- int err = 0, do_rec = 0, cache_hook = 0;
- char *devstr = NULL, *typestr = NULL, *opts = NULL;
-
- ENTRY;
-
- CDEBUG(D_SUPER, "mount opts: %s\n", data ?
- (char *)data : "(none)");
-
- init_option(data);
-
- /* read and validate passed options. */
- cache_data = smfs_options(data, &devstr, &typestr,
- &do_rec, &cache_hook, &opts,
- &iopen_nopriv);
-
- if (*cache_data)
- CWARN("smfs_fill_super(): options parsing stoped at "
- "option %s\n", cache_data);
-
- if (!typestr || !devstr) {
- CERROR("mount options name and dev mandatory\n");
- GOTO(out_err, err = -EINVAL);
- }
-
- err = sm_mount_cache(sb, devstr, typestr, opts,
- iopen_nopriv);
-
- if (err) {
- CERROR("Can not mount %s as %s, rc = %d\n", devstr,
- typestr, err);
- GOTO(out_err, err);
- }
-
- if (do_rec)
- smfs_rec_init(sb);
-
- if (cache_hook)
- cache_space_hook_init(sb);
-
- dget(S2CSB(sb)->s_root);
- root_ino = S2CSB(sb)->s_root->d_inode->i_ino;
- root_inode = iget(sb, root_ino);
-
- 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(root_inode);
-
- if (!sb->s_root) {
- sm_umount_cache(sb);
- GOTO(out_err, err = -EINVAL);
- }
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
- CDEBUG(D_SUPER, "sb %lx, &sb->u.generic_sbp: %lx\n",
- (ulong)sb, (ulong)&sb->u.generic_sbp);
-#else
- CDEBUG(D_SUPER, "sb %lx, &sb->s_fs_info: %lx\n",
- (ulong)sb, (ulong)&sb->s_fs_info);
-#endif
-
+ struct inode *root_inode = NULL;
+ char *devstr = NULL, *typestr = NULL;
+ char *cache_data;
+ ino_t root_ino;
+ int err = 0, kml = 0;
+
+ ENTRY;
+
+ 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, &kml);
+ 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);
+ }
+
+ if (kml) smfs_kml_init(sb);
+
+ setup_sm_journal_ops(typestr);
+
+ dget(S2CSB(sb)->s_root);
+ root_ino = S2CSB(sb)->s_root->d_inode->i_ino;
+ root_inode = iget(sb, root_ino);
+
+ 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(root_inode);
+
+ if (!sb->s_root) {
+ GOTO(out_err, err=-EINVAL);
+ }
+
+ CDEBUG(D_SUPER, "sb %lx, &sb->u.generic_sbp: %lx\n",
+ (ulong) sb, (ulong) &sb->u.generic_sbp);
+
out_err:
- cleanup_option();
- return err;
-}
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
-static struct super_block *smfs_read_super(struct super_block *sb,
- void *data, int silent)
-{
- int err;
-
- err = smfs_fill_super(sb, data, silent);
- if (err)
- return NULL;
-
- return sb;
-}
-#else
-struct super_block *smfs_get_sb(struct file_system_type *fs_type,
- int flags, const char *dev_name,
- void *data)
-{
- return get_sb_nodev(fs_type, flags, data, smfs_fill_super);
+ cleanup_option();
+ if (err)
+ return NULL;
+ return sb;
}
-#endif
-static struct file_system_type smfs_type = {
- .owner = THIS_MODULE,
- .name = "smfs",
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
- .read_super = smfs_read_super,
-#else
- .get_sb = smfs_get_sb,
- .kill_sb = kill_anon_super,
-#endif
-};
+static DECLARE_FSTYPE(smfs_type, "smfs", smfs_read_super, 0);
int init_smfs(void)
{
- int err;
-
- err = register_filesystem(&smfs_type);
- if (err) {
- CERROR("register_filesystem() failed, "
- "rc = %d\n", err);
- }
- return err;
+ int err = 0;
+
+ err = register_filesystem(&smfs_type);
+ if (err) {
+ CERROR("smfs: failed in register Storage Management filesystem!\n");
+ }
+ init_smfs_cache();
+ return err;
}
int cleanup_smfs(void)
{
- int err = 0;
-
- err = unregister_filesystem(&smfs_type);
- if (err) {
- CERROR("unregister_filesystem() failed, "
- "rc = %d\n", err);
- }
- return 0;
+ int err = 0;
+
+ ENTRY;
+ err = unregister_filesystem(&smfs_type);
+ if (err) {
+ CERROR("smfs: failed to unregister Storage Management filesystem!\n");
+ }
+ cleanup_smfs_cache();
+ return 0;
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff