We're going to remove the tie between ocfs2_dlmfs and o2dlm.
ocfs2_dlmfs doesn't belong in the fs/ocfs2/dlm directory anymore. Here
we move it to fs/ocfs2/dlmfs.
Signed-off-by: Joel Becker <joel.becker@oracle.com>
ocfs2_stack_o2cb-objs := stack_o2cb.o
ocfs2_stack_user-objs := stack_user.o
+obj-$(CONFIG_OCFS2_FS) += dlmfs/
# cluster/ is always needed when OCFS2_FS for masklog support
obj-$(CONFIG_OCFS2_FS) += cluster/
obj-$(CONFIG_OCFS2_FS_O2CB) += dlm/
EXTRA_CFLAGS += -Ifs/ocfs2
-obj-$(CONFIG_OCFS2_FS_O2CB) += ocfs2_dlm.o ocfs2_dlmfs.o
+obj-$(CONFIG_OCFS2_FS_O2CB) += ocfs2_dlm.o
ocfs2_dlm-objs := dlmdomain.o dlmdebug.o dlmthread.o dlmrecovery.o \
dlmmaster.o dlmast.o dlmconvert.o dlmlock.o dlmunlock.o dlmver.o
-ocfs2_dlmfs-objs := userdlm.o dlmfs.o dlmfsver.o
+++ /dev/null
-/* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * dlmfs.c
- *
- * Code which implements the kernel side of a minimal userspace
- * interface to our DLM. This file handles the virtual file system
- * used for communication with userspace. Credit should go to ramfs,
- * which was a template for the fs side of this module.
- *
- * Copyright (C) 2003, 2004 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program 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 this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-/* Simple VFS hooks based on: */
-/*
- * Resizable simple ram filesystem for Linux.
- *
- * Copyright (C) 2000 Linus Torvalds.
- * 2000 Transmeta Corp.
- */
-
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/pagemap.h>
-#include <linux/types.h>
-#include <linux/slab.h>
-#include <linux/highmem.h>
-#include <linux/init.h>
-#include <linux/string.h>
-#include <linux/backing-dev.h>
-#include <linux/poll.h>
-
-#include <asm/uaccess.h>
-
-
-#include "cluster/nodemanager.h"
-#include "cluster/heartbeat.h"
-#include "cluster/tcp.h"
-
-#include "dlmapi.h"
-
-#include "userdlm.h"
-
-#include "dlmfsver.h"
-
-#define MLOG_MASK_PREFIX ML_DLMFS
-#include "cluster/masklog.h"
-
-#include "ocfs2_lockingver.h"
-
-static const struct super_operations dlmfs_ops;
-static const struct file_operations dlmfs_file_operations;
-static const struct inode_operations dlmfs_dir_inode_operations;
-static const struct inode_operations dlmfs_root_inode_operations;
-static const struct inode_operations dlmfs_file_inode_operations;
-static struct kmem_cache *dlmfs_inode_cache;
-
-struct workqueue_struct *user_dlm_worker;
-
-/*
- * This is the userdlmfs locking protocol version.
- *
- * See fs/ocfs2/dlmglue.c for more details on locking versions.
- */
-static const struct dlm_protocol_version user_locking_protocol = {
- .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR,
- .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR,
-};
-
-
-/*
- * These are the ABI capabilities of dlmfs.
- *
- * Over time, dlmfs has added some features that were not part of the
- * initial ABI. Unfortunately, some of these features are not detectable
- * via standard usage. For example, Linux's default poll always returns
- * POLLIN, so there is no way for a caller of poll(2) to know when dlmfs
- * added poll support. Instead, we provide this list of new capabilities.
- *
- * Capabilities is a read-only attribute. We do it as a module parameter
- * so we can discover it whether dlmfs is built in, loaded, or even not
- * loaded.
- *
- * The ABI features are local to this machine's dlmfs mount. This is
- * distinct from the locking protocol, which is concerned with inter-node
- * interaction.
- *
- * Capabilities:
- * - bast : POLLIN against the file descriptor of a held lock
- * signifies a bast fired on the lock.
- */
-#define DLMFS_CAPABILITIES "bast"
-extern int param_set_dlmfs_capabilities(const char *val,
- struct kernel_param *kp)
-{
- printk(KERN_ERR "%s: readonly parameter\n", kp->name);
- return -EINVAL;
-}
-static int param_get_dlmfs_capabilities(char *buffer,
- struct kernel_param *kp)
-{
- return strlcpy(buffer, DLMFS_CAPABILITIES,
- strlen(DLMFS_CAPABILITIES) + 1);
-}
-module_param_call(capabilities, param_set_dlmfs_capabilities,
- param_get_dlmfs_capabilities, NULL, 0444);
-MODULE_PARM_DESC(capabilities, DLMFS_CAPABILITIES);
-
-
-/*
- * decodes a set of open flags into a valid lock level and a set of flags.
- * returns < 0 if we have invalid flags
- * flags which mean something to us:
- * O_RDONLY -> PRMODE level
- * O_WRONLY -> EXMODE level
- *
- * O_NONBLOCK -> LKM_NOQUEUE
- */
-static int dlmfs_decode_open_flags(int open_flags,
- int *level,
- int *flags)
-{
- if (open_flags & (O_WRONLY|O_RDWR))
- *level = LKM_EXMODE;
- else
- *level = LKM_PRMODE;
-
- *flags = 0;
- if (open_flags & O_NONBLOCK)
- *flags |= LKM_NOQUEUE;
-
- return 0;
-}
-
-static int dlmfs_file_open(struct inode *inode,
- struct file *file)
-{
- int status, level, flags;
- struct dlmfs_filp_private *fp = NULL;
- struct dlmfs_inode_private *ip;
-
- if (S_ISDIR(inode->i_mode))
- BUG();
-
- mlog(0, "open called on inode %lu, flags 0x%x\n", inode->i_ino,
- file->f_flags);
-
- status = dlmfs_decode_open_flags(file->f_flags, &level, &flags);
- if (status < 0)
- goto bail;
-
- /* We don't want to honor O_APPEND at read/write time as it
- * doesn't make sense for LVB writes. */
- file->f_flags &= ~O_APPEND;
-
- fp = kmalloc(sizeof(*fp), GFP_NOFS);
- if (!fp) {
- status = -ENOMEM;
- goto bail;
- }
- fp->fp_lock_level = level;
-
- ip = DLMFS_I(inode);
-
- status = user_dlm_cluster_lock(&ip->ip_lockres, level, flags);
- if (status < 0) {
- /* this is a strange error to return here but I want
- * to be able userspace to be able to distinguish a
- * valid lock request from one that simply couldn't be
- * granted. */
- if (flags & LKM_NOQUEUE && status == -EAGAIN)
- status = -ETXTBSY;
- kfree(fp);
- goto bail;
- }
-
- file->private_data = fp;
-bail:
- return status;
-}
-
-static int dlmfs_file_release(struct inode *inode,
- struct file *file)
-{
- int level, status;
- struct dlmfs_inode_private *ip = DLMFS_I(inode);
- struct dlmfs_filp_private *fp =
- (struct dlmfs_filp_private *) file->private_data;
-
- if (S_ISDIR(inode->i_mode))
- BUG();
-
- mlog(0, "close called on inode %lu\n", inode->i_ino);
-
- status = 0;
- if (fp) {
- level = fp->fp_lock_level;
- if (level != LKM_IVMODE)
- user_dlm_cluster_unlock(&ip->ip_lockres, level);
-
- kfree(fp);
- file->private_data = NULL;
- }
-
- return 0;
-}
-
-static unsigned int dlmfs_file_poll(struct file *file, poll_table *wait)
-{
- int event = 0;
- struct inode *inode = file->f_path.dentry->d_inode;
- struct dlmfs_inode_private *ip = DLMFS_I(inode);
-
- poll_wait(file, &ip->ip_lockres.l_event, wait);
-
- spin_lock(&ip->ip_lockres.l_lock);
- if (ip->ip_lockres.l_flags & USER_LOCK_BLOCKED)
- event = POLLIN | POLLRDNORM;
- spin_unlock(&ip->ip_lockres.l_lock);
-
- return event;
-}
-
-static ssize_t dlmfs_file_read(struct file *filp,
- char __user *buf,
- size_t count,
- loff_t *ppos)
-{
- int bytes_left;
- ssize_t readlen;
- char *lvb_buf;
- struct inode *inode = filp->f_path.dentry->d_inode;
-
- mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
- inode->i_ino, count, *ppos);
-
- if (*ppos >= i_size_read(inode))
- return 0;
-
- if (!count)
- return 0;
-
- if (!access_ok(VERIFY_WRITE, buf, count))
- return -EFAULT;
-
- /* don't read past the lvb */
- if ((count + *ppos) > i_size_read(inode))
- readlen = i_size_read(inode) - *ppos;
- else
- readlen = count - *ppos;
-
- lvb_buf = kmalloc(readlen, GFP_NOFS);
- if (!lvb_buf)
- return -ENOMEM;
-
- user_dlm_read_lvb(inode, lvb_buf, readlen);
- bytes_left = __copy_to_user(buf, lvb_buf, readlen);
- readlen -= bytes_left;
-
- kfree(lvb_buf);
-
- *ppos = *ppos + readlen;
-
- mlog(0, "read %zd bytes\n", readlen);
- return readlen;
-}
-
-static ssize_t dlmfs_file_write(struct file *filp,
- const char __user *buf,
- size_t count,
- loff_t *ppos)
-{
- int bytes_left;
- ssize_t writelen;
- char *lvb_buf;
- struct inode *inode = filp->f_path.dentry->d_inode;
-
- mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
- inode->i_ino, count, *ppos);
-
- if (*ppos >= i_size_read(inode))
- return -ENOSPC;
-
- if (!count)
- return 0;
-
- if (!access_ok(VERIFY_READ, buf, count))
- return -EFAULT;
-
- /* don't write past the lvb */
- if ((count + *ppos) > i_size_read(inode))
- writelen = i_size_read(inode) - *ppos;
- else
- writelen = count - *ppos;
-
- lvb_buf = kmalloc(writelen, GFP_NOFS);
- if (!lvb_buf)
- return -ENOMEM;
-
- bytes_left = copy_from_user(lvb_buf, buf, writelen);
- writelen -= bytes_left;
- if (writelen)
- user_dlm_write_lvb(inode, lvb_buf, writelen);
-
- kfree(lvb_buf);
-
- *ppos = *ppos + writelen;
- mlog(0, "wrote %zd bytes\n", writelen);
- return writelen;
-}
-
-static void dlmfs_init_once(void *foo)
-{
- struct dlmfs_inode_private *ip =
- (struct dlmfs_inode_private *) foo;
-
- ip->ip_dlm = NULL;
- ip->ip_parent = NULL;
-
- inode_init_once(&ip->ip_vfs_inode);
-}
-
-static struct inode *dlmfs_alloc_inode(struct super_block *sb)
-{
- struct dlmfs_inode_private *ip;
-
- ip = kmem_cache_alloc(dlmfs_inode_cache, GFP_NOFS);
- if (!ip)
- return NULL;
-
- return &ip->ip_vfs_inode;
-}
-
-static void dlmfs_destroy_inode(struct inode *inode)
-{
- kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode));
-}
-
-static void dlmfs_clear_inode(struct inode *inode)
-{
- int status;
- struct dlmfs_inode_private *ip;
-
- if (!inode)
- return;
-
- mlog(0, "inode %lu\n", inode->i_ino);
-
- ip = DLMFS_I(inode);
-
- if (S_ISREG(inode->i_mode)) {
- status = user_dlm_destroy_lock(&ip->ip_lockres);
- if (status < 0)
- mlog_errno(status);
- iput(ip->ip_parent);
- goto clear_fields;
- }
-
- mlog(0, "we're a directory, ip->ip_dlm = 0x%p\n", ip->ip_dlm);
- /* we must be a directory. If required, lets unregister the
- * dlm context now. */
- if (ip->ip_dlm)
- user_dlm_unregister_context(ip->ip_dlm);
-clear_fields:
- ip->ip_parent = NULL;
- ip->ip_dlm = NULL;
-}
-
-static struct backing_dev_info dlmfs_backing_dev_info = {
- .name = "ocfs2-dlmfs",
- .ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
-};
-
-static struct inode *dlmfs_get_root_inode(struct super_block *sb)
-{
- struct inode *inode = new_inode(sb);
- int mode = S_IFDIR | 0755;
- struct dlmfs_inode_private *ip;
-
- if (inode) {
- ip = DLMFS_I(inode);
-
- inode->i_mode = mode;
- inode->i_uid = current_fsuid();
- inode->i_gid = current_fsgid();
- inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
- inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
- inc_nlink(inode);
-
- inode->i_fop = &simple_dir_operations;
- inode->i_op = &dlmfs_root_inode_operations;
- }
-
- return inode;
-}
-
-static struct inode *dlmfs_get_inode(struct inode *parent,
- struct dentry *dentry,
- int mode)
-{
- struct super_block *sb = parent->i_sb;
- struct inode * inode = new_inode(sb);
- struct dlmfs_inode_private *ip;
-
- if (!inode)
- return NULL;
-
- inode->i_mode = mode;
- inode->i_uid = current_fsuid();
- inode->i_gid = current_fsgid();
- inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
- inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
-
- ip = DLMFS_I(inode);
- ip->ip_dlm = DLMFS_I(parent)->ip_dlm;
-
- switch (mode & S_IFMT) {
- default:
- /* for now we don't support anything other than
- * directories and regular files. */
- BUG();
- break;
- case S_IFREG:
- inode->i_op = &dlmfs_file_inode_operations;
- inode->i_fop = &dlmfs_file_operations;
-
- i_size_write(inode, DLM_LVB_LEN);
-
- user_dlm_lock_res_init(&ip->ip_lockres, dentry);
-
- /* released at clear_inode time, this insures that we
- * get to drop the dlm reference on each lock *before*
- * we call the unregister code for releasing parent
- * directories. */
- ip->ip_parent = igrab(parent);
- BUG_ON(!ip->ip_parent);
- break;
- case S_IFDIR:
- inode->i_op = &dlmfs_dir_inode_operations;
- inode->i_fop = &simple_dir_operations;
-
- /* directory inodes start off with i_nlink ==
- * 2 (for "." entry) */
- inc_nlink(inode);
- break;
- }
-
- if (parent->i_mode & S_ISGID) {
- inode->i_gid = parent->i_gid;
- if (S_ISDIR(mode))
- inode->i_mode |= S_ISGID;
- }
-
- return inode;
-}
-
-/*
- * File creation. Allocate an inode, and we're done..
- */
-/* SMP-safe */
-static int dlmfs_mkdir(struct inode * dir,
- struct dentry * dentry,
- int mode)
-{
- int status;
- struct inode *inode = NULL;
- struct qstr *domain = &dentry->d_name;
- struct dlmfs_inode_private *ip;
- struct dlm_ctxt *dlm;
- struct dlm_protocol_version proto = user_locking_protocol;
-
- mlog(0, "mkdir %.*s\n", domain->len, domain->name);
-
- /* verify that we have a proper domain */
- if (domain->len >= O2NM_MAX_NAME_LEN) {
- status = -EINVAL;
- mlog(ML_ERROR, "invalid domain name for directory.\n");
- goto bail;
- }
-
- inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR);
- if (!inode) {
- status = -ENOMEM;
- mlog_errno(status);
- goto bail;
- }
-
- ip = DLMFS_I(inode);
-
- dlm = user_dlm_register_context(domain, &proto);
- if (IS_ERR(dlm)) {
- status = PTR_ERR(dlm);
- mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n",
- status, domain->len, domain->name);
- goto bail;
- }
- ip->ip_dlm = dlm;
-
- inc_nlink(dir);
- d_instantiate(dentry, inode);
- dget(dentry); /* Extra count - pin the dentry in core */
-
- status = 0;
-bail:
- if (status < 0)
- iput(inode);
- return status;
-}
-
-static int dlmfs_create(struct inode *dir,
- struct dentry *dentry,
- int mode,
- struct nameidata *nd)
-{
- int status = 0;
- struct inode *inode;
- struct qstr *name = &dentry->d_name;
-
- mlog(0, "create %.*s\n", name->len, name->name);
-
- /* verify name is valid and doesn't contain any dlm reserved
- * characters */
- if (name->len >= USER_DLM_LOCK_ID_MAX_LEN ||
- name->name[0] == '$') {
- status = -EINVAL;
- mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len,
- name->name);
- goto bail;
- }
-
- inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG);
- if (!inode) {
- status = -ENOMEM;
- mlog_errno(status);
- goto bail;
- }
-
- d_instantiate(dentry, inode);
- dget(dentry); /* Extra count - pin the dentry in core */
-bail:
- return status;
-}
-
-static int dlmfs_unlink(struct inode *dir,
- struct dentry *dentry)
-{
- int status;
- struct inode *inode = dentry->d_inode;
-
- mlog(0, "unlink inode %lu\n", inode->i_ino);
-
- /* if there are no current holders, or none that are waiting
- * to acquire a lock, this basically destroys our lockres. */
- status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres);
- if (status < 0) {
- mlog(ML_ERROR, "unlink %.*s, error %d from destroy\n",
- dentry->d_name.len, dentry->d_name.name, status);
- goto bail;
- }
- status = simple_unlink(dir, dentry);
-bail:
- return status;
-}
-
-static int dlmfs_fill_super(struct super_block * sb,
- void * data,
- int silent)
-{
- struct inode * inode;
- struct dentry * root;
-
- sb->s_maxbytes = MAX_LFS_FILESIZE;
- sb->s_blocksize = PAGE_CACHE_SIZE;
- sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
- sb->s_magic = DLMFS_MAGIC;
- sb->s_op = &dlmfs_ops;
- inode = dlmfs_get_root_inode(sb);
- if (!inode)
- return -ENOMEM;
-
- root = d_alloc_root(inode);
- if (!root) {
- iput(inode);
- return -ENOMEM;
- }
- sb->s_root = root;
- return 0;
-}
-
-static const struct file_operations dlmfs_file_operations = {
- .open = dlmfs_file_open,
- .release = dlmfs_file_release,
- .poll = dlmfs_file_poll,
- .read = dlmfs_file_read,
- .write = dlmfs_file_write,
-};
-
-static const struct inode_operations dlmfs_dir_inode_operations = {
- .create = dlmfs_create,
- .lookup = simple_lookup,
- .unlink = dlmfs_unlink,
-};
-
-/* this way we can restrict mkdir to only the toplevel of the fs. */
-static const struct inode_operations dlmfs_root_inode_operations = {
- .lookup = simple_lookup,
- .mkdir = dlmfs_mkdir,
- .rmdir = simple_rmdir,
-};
-
-static const struct super_operations dlmfs_ops = {
- .statfs = simple_statfs,
- .alloc_inode = dlmfs_alloc_inode,
- .destroy_inode = dlmfs_destroy_inode,
- .clear_inode = dlmfs_clear_inode,
- .drop_inode = generic_delete_inode,
-};
-
-static const struct inode_operations dlmfs_file_inode_operations = {
- .getattr = simple_getattr,
-};
-
-static int dlmfs_get_sb(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data, struct vfsmount *mnt)
-{
- return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super, mnt);
-}
-
-static struct file_system_type dlmfs_fs_type = {
- .owner = THIS_MODULE,
- .name = "ocfs2_dlmfs",
- .get_sb = dlmfs_get_sb,
- .kill_sb = kill_litter_super,
-};
-
-static int __init init_dlmfs_fs(void)
-{
- int status;
- int cleanup_inode = 0, cleanup_worker = 0;
-
- dlmfs_print_version();
-
- status = bdi_init(&dlmfs_backing_dev_info);
- if (status)
- return status;
-
- dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache",
- sizeof(struct dlmfs_inode_private),
- 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
- SLAB_MEM_SPREAD),
- dlmfs_init_once);
- if (!dlmfs_inode_cache) {
- status = -ENOMEM;
- goto bail;
- }
- cleanup_inode = 1;
-
- user_dlm_worker = create_singlethread_workqueue("user_dlm");
- if (!user_dlm_worker) {
- status = -ENOMEM;
- goto bail;
- }
- cleanup_worker = 1;
-
- status = register_filesystem(&dlmfs_fs_type);
-bail:
- if (status) {
- if (cleanup_inode)
- kmem_cache_destroy(dlmfs_inode_cache);
- if (cleanup_worker)
- destroy_workqueue(user_dlm_worker);
- bdi_destroy(&dlmfs_backing_dev_info);
- } else
- printk("OCFS2 User DLM kernel interface loaded\n");
- return status;
-}
-
-static void __exit exit_dlmfs_fs(void)
-{
- unregister_filesystem(&dlmfs_fs_type);
-
- flush_workqueue(user_dlm_worker);
- destroy_workqueue(user_dlm_worker);
-
- kmem_cache_destroy(dlmfs_inode_cache);
-
- bdi_destroy(&dlmfs_backing_dev_info);
-}
-
-MODULE_AUTHOR("Oracle");
-MODULE_LICENSE("GPL");
-
-module_init(init_dlmfs_fs)
-module_exit(exit_dlmfs_fs)
+++ /dev/null
-/* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * dlmfsver.c
- *
- * version string
- *
- * Copyright (C) 2002, 2005 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program 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 this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-
-#include "dlmfsver.h"
-
-#define DLM_BUILD_VERSION "1.5.0"
-
-#define VERSION_STR "OCFS2 DLMFS " DLM_BUILD_VERSION
-
-void dlmfs_print_version(void)
-{
- printk(KERN_INFO "%s\n", VERSION_STR);
-}
-
-MODULE_DESCRIPTION(VERSION_STR);
-
-MODULE_VERSION(DLM_BUILD_VERSION);
+++ /dev/null
-/* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * dlmver.h
- *
- * Function prototypes
- *
- * Copyright (C) 2005 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program 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 this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-#ifndef DLMFS_VER_H
-#define DLMFS_VER_H
-
-void dlmfs_print_version(void);
-
-#endif /* DLMFS_VER_H */
+++ /dev/null
-/* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * userdlm.c
- *
- * Code which implements the kernel side of a minimal userspace
- * interface to our DLM.
- *
- * Many of the functions here are pared down versions of dlmglue.c
- * functions.
- *
- * Copyright (C) 2003, 2004 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program 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 this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-#include <linux/signal.h>
-
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/types.h>
-#include <linux/crc32.h>
-
-
-#include "cluster/nodemanager.h"
-#include "cluster/heartbeat.h"
-#include "cluster/tcp.h"
-
-#include "dlmapi.h"
-
-#include "userdlm.h"
-
-#define MLOG_MASK_PREFIX ML_DLMFS
-#include "cluster/masklog.h"
-
-static inline int user_check_wait_flag(struct user_lock_res *lockres,
- int flag)
-{
- int ret;
-
- spin_lock(&lockres->l_lock);
- ret = lockres->l_flags & flag;
- spin_unlock(&lockres->l_lock);
-
- return ret;
-}
-
-static inline void user_wait_on_busy_lock(struct user_lock_res *lockres)
-
-{
- wait_event(lockres->l_event,
- !user_check_wait_flag(lockres, USER_LOCK_BUSY));
-}
-
-static inline void user_wait_on_blocked_lock(struct user_lock_res *lockres)
-
-{
- wait_event(lockres->l_event,
- !user_check_wait_flag(lockres, USER_LOCK_BLOCKED));
-}
-
-/* I heart container_of... */
-static inline struct dlm_ctxt *
-dlm_ctxt_from_user_lockres(struct user_lock_res *lockres)
-{
- struct dlmfs_inode_private *ip;
-
- ip = container_of(lockres,
- struct dlmfs_inode_private,
- ip_lockres);
- return ip->ip_dlm;
-}
-
-static struct inode *
-user_dlm_inode_from_user_lockres(struct user_lock_res *lockres)
-{
- struct dlmfs_inode_private *ip;
-
- ip = container_of(lockres,
- struct dlmfs_inode_private,
- ip_lockres);
- return &ip->ip_vfs_inode;
-}
-
-static inline void user_recover_from_dlm_error(struct user_lock_res *lockres)
-{
- spin_lock(&lockres->l_lock);
- lockres->l_flags &= ~USER_LOCK_BUSY;
- spin_unlock(&lockres->l_lock);
-}
-
-#define user_log_dlm_error(_func, _stat, _lockres) do { \
- mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \
- "resource %.*s: %s\n", dlm_errname(_stat), _func, \
- _lockres->l_namelen, _lockres->l_name, dlm_errmsg(_stat)); \
-} while (0)
-
-/* WARNING: This function lives in a world where the only three lock
- * levels are EX, PR, and NL. It *will* have to be adjusted when more
- * lock types are added. */
-static inline int user_highest_compat_lock_level(int level)
-{
- int new_level = LKM_EXMODE;
-
- if (level == LKM_EXMODE)
- new_level = LKM_NLMODE;
- else if (level == LKM_PRMODE)
- new_level = LKM_PRMODE;
- return new_level;
-}
-
-static void user_ast(void *opaque)
-{
- struct user_lock_res *lockres = opaque;
- struct dlm_lockstatus *lksb;
-
- mlog(0, "AST fired for lockres %.*s\n", lockres->l_namelen,
- lockres->l_name);
-
- spin_lock(&lockres->l_lock);
-
- lksb = &(lockres->l_lksb);
- if (lksb->status != DLM_NORMAL) {
- mlog(ML_ERROR, "lksb status value of %u on lockres %.*s\n",
- lksb->status, lockres->l_namelen, lockres->l_name);
- spin_unlock(&lockres->l_lock);
- return;
- }
-
- mlog_bug_on_msg(lockres->l_requested == LKM_IVMODE,
- "Lockres %.*s, requested ivmode. flags 0x%x\n",
- lockres->l_namelen, lockres->l_name, lockres->l_flags);
-
- /* we're downconverting. */
- if (lockres->l_requested < lockres->l_level) {
- if (lockres->l_requested <=
- user_highest_compat_lock_level(lockres->l_blocking)) {
- lockres->l_blocking = LKM_NLMODE;
- lockres->l_flags &= ~USER_LOCK_BLOCKED;
- }
- }
-
- lockres->l_level = lockres->l_requested;
- lockres->l_requested = LKM_IVMODE;
- lockres->l_flags |= USER_LOCK_ATTACHED;
- lockres->l_flags &= ~USER_LOCK_BUSY;
-
- spin_unlock(&lockres->l_lock);
-
- wake_up(&lockres->l_event);
-}
-
-static inline void user_dlm_grab_inode_ref(struct user_lock_res *lockres)
-{
- struct inode *inode;
- inode = user_dlm_inode_from_user_lockres(lockres);
- if (!igrab(inode))
- BUG();
-}
-
-static void user_dlm_unblock_lock(struct work_struct *work);
-
-static void __user_dlm_queue_lockres(struct user_lock_res *lockres)
-{
- if (!(lockres->l_flags & USER_LOCK_QUEUED)) {
- user_dlm_grab_inode_ref(lockres);
-
- INIT_WORK(&lockres->l_work, user_dlm_unblock_lock);
-
- queue_work(user_dlm_worker, &lockres->l_work);
- lockres->l_flags |= USER_LOCK_QUEUED;
- }
-}
-
-static void __user_dlm_cond_queue_lockres(struct user_lock_res *lockres)
-{
- int queue = 0;
-
- if (!(lockres->l_flags & USER_LOCK_BLOCKED))
- return;
-
- switch (lockres->l_blocking) {
- case LKM_EXMODE:
- if (!lockres->l_ex_holders && !lockres->l_ro_holders)
- queue = 1;
- break;
- case LKM_PRMODE:
- if (!lockres->l_ex_holders)
- queue = 1;
- break;
- default:
- BUG();
- }
-
- if (queue)
- __user_dlm_queue_lockres(lockres);
-}
-
-static void user_bast(void *opaque, int level)
-{
- struct user_lock_res *lockres = opaque;
-
- mlog(0, "Blocking AST fired for lockres %.*s. Blocking level %d\n",
- lockres->l_namelen, lockres->l_name, level);
-
- spin_lock(&lockres->l_lock);
- lockres->l_flags |= USER_LOCK_BLOCKED;
- if (level > lockres->l_blocking)
- lockres->l_blocking = level;
-
- __user_dlm_queue_lockres(lockres);
- spin_unlock(&lockres->l_lock);
-
- wake_up(&lockres->l_event);
-}
-
-static void user_unlock_ast(void *opaque, enum dlm_status status)
-{
- struct user_lock_res *lockres = opaque;
-
- mlog(0, "UNLOCK AST called on lock %.*s\n", lockres->l_namelen,
- lockres->l_name);
-
- if (status != DLM_NORMAL && status != DLM_CANCELGRANT)
- mlog(ML_ERROR, "Dlm returns status %d\n", status);
-
- spin_lock(&lockres->l_lock);
- /* The teardown flag gets set early during the unlock process,
- * so test the cancel flag to make sure that this ast isn't
- * for a concurrent cancel. */
- if (lockres->l_flags & USER_LOCK_IN_TEARDOWN
- && !(lockres->l_flags & USER_LOCK_IN_CANCEL)) {
- lockres->l_level = LKM_IVMODE;
- } else if (status == DLM_CANCELGRANT) {
- /* We tried to cancel a convert request, but it was
- * already granted. Don't clear the busy flag - the
- * ast should've done this already. */
- BUG_ON(!(lockres->l_flags & USER_LOCK_IN_CANCEL));
- lockres->l_flags &= ~USER_LOCK_IN_CANCEL;
- goto out_noclear;
- } else {
- BUG_ON(!(lockres->l_flags & USER_LOCK_IN_CANCEL));
- /* Cancel succeeded, we want to re-queue */
- lockres->l_requested = LKM_IVMODE; /* cancel an
- * upconvert
- * request. */
- lockres->l_flags &= ~USER_LOCK_IN_CANCEL;
- /* we want the unblock thread to look at it again
- * now. */
- if (lockres->l_flags & USER_LOCK_BLOCKED)
- __user_dlm_queue_lockres(lockres);
- }
-
- lockres->l_flags &= ~USER_LOCK_BUSY;
-out_noclear:
- spin_unlock(&lockres->l_lock);
-
- wake_up(&lockres->l_event);
-}
-
-static inline void user_dlm_drop_inode_ref(struct user_lock_res *lockres)
-{
- struct inode *inode;
- inode = user_dlm_inode_from_user_lockres(lockres);
- iput(inode);
-}
-
-static void user_dlm_unblock_lock(struct work_struct *work)
-{
- int new_level, status;
- struct user_lock_res *lockres =
- container_of(work, struct user_lock_res, l_work);
- struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres);
-
- mlog(0, "processing lockres %.*s\n", lockres->l_namelen,
- lockres->l_name);
-
- spin_lock(&lockres->l_lock);
-
- mlog_bug_on_msg(!(lockres->l_flags & USER_LOCK_QUEUED),
- "Lockres %.*s, flags 0x%x\n",
- lockres->l_namelen, lockres->l_name, lockres->l_flags);
-
- /* notice that we don't clear USER_LOCK_BLOCKED here. If it's
- * set, we want user_ast clear it. */
- lockres->l_flags &= ~USER_LOCK_QUEUED;
-
- /* It's valid to get here and no longer be blocked - if we get
- * several basts in a row, we might be queued by the first
- * one, the unblock thread might run and clear the queued
- * flag, and finally we might get another bast which re-queues
- * us before our ast for the downconvert is called. */
- if (!(lockres->l_flags & USER_LOCK_BLOCKED)) {
- spin_unlock(&lockres->l_lock);
- goto drop_ref;
- }
-
- if (lockres->l_flags & USER_LOCK_IN_TEARDOWN) {
- spin_unlock(&lockres->l_lock);
- goto drop_ref;
- }
-
- if (lockres->l_flags & USER_LOCK_BUSY) {
- if (lockres->l_flags & USER_LOCK_IN_CANCEL) {
- spin_unlock(&lockres->l_lock);
- goto drop_ref;
- }
-
- lockres->l_flags |= USER_LOCK_IN_CANCEL;
- spin_unlock(&lockres->l_lock);
-
- status = dlmunlock(dlm,
- &lockres->l_lksb,
- LKM_CANCEL,
- user_unlock_ast,
- lockres);
- if (status != DLM_NORMAL)
- user_log_dlm_error("dlmunlock", status, lockres);
- goto drop_ref;
- }
-
- /* If there are still incompat holders, we can exit safely
- * without worrying about re-queueing this lock as that will
- * happen on the last call to user_cluster_unlock. */
- if ((lockres->l_blocking == LKM_EXMODE)
- && (lockres->l_ex_holders || lockres->l_ro_holders)) {
- spin_unlock(&lockres->l_lock);
- mlog(0, "can't downconvert for ex: ro = %u, ex = %u\n",
- lockres->l_ro_holders, lockres->l_ex_holders);
- goto drop_ref;
- }
-
- if ((lockres->l_blocking == LKM_PRMODE)
- && lockres->l_ex_holders) {
- spin_unlock(&lockres->l_lock);
- mlog(0, "can't downconvert for pr: ex = %u\n",
- lockres->l_ex_holders);
- goto drop_ref;
- }
-
- /* yay, we can downconvert now. */
- new_level = user_highest_compat_lock_level(lockres->l_blocking);
- lockres->l_requested = new_level;
- lockres->l_flags |= USER_LOCK_BUSY;
- mlog(0, "Downconvert lock from %d to %d\n",
- lockres->l_level, new_level);
- spin_unlock(&lockres->l_lock);
-
- /* need lock downconvert request now... */
- status = dlmlock(dlm,
- new_level,
- &lockres->l_lksb,
- LKM_CONVERT|LKM_VALBLK,
- lockres->l_name,
- lockres->l_namelen,
- user_ast,
- lockres,
- user_bast);
- if (status != DLM_NORMAL) {
- user_log_dlm_error("dlmlock", status, lockres);
- user_recover_from_dlm_error(lockres);
- }
-
-drop_ref:
- user_dlm_drop_inode_ref(lockres);
-}
-
-static inline void user_dlm_inc_holders(struct user_lock_res *lockres,
- int level)
-{
- switch(level) {
- case LKM_EXMODE:
- lockres->l_ex_holders++;
- break;
- case LKM_PRMODE:
- lockres->l_ro_holders++;
- break;
- default:
- BUG();
- }
-}
-
-/* predict what lock level we'll be dropping down to on behalf
- * of another node, and return true if the currently wanted
- * level will be compatible with it. */
-static inline int
-user_may_continue_on_blocked_lock(struct user_lock_res *lockres,
- int wanted)
-{
- BUG_ON(!(lockres->l_flags & USER_LOCK_BLOCKED));
-
- return wanted <= user_highest_compat_lock_level(lockres->l_blocking);
-}
-
-int user_dlm_cluster_lock(struct user_lock_res *lockres,
- int level,
- int lkm_flags)
-{
- int status, local_flags;
- struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres);
-
- if (level != LKM_EXMODE &&
- level != LKM_PRMODE) {
- mlog(ML_ERROR, "lockres %.*s: invalid request!\n",
- lockres->l_namelen, lockres->l_name);
- status = -EINVAL;
- goto bail;
- }
-
- mlog(0, "lockres %.*s: asking for %s lock, passed flags = 0x%x\n",
- lockres->l_namelen, lockres->l_name,
- (level == LKM_EXMODE) ? "LKM_EXMODE" : "LKM_PRMODE",
- lkm_flags);
-
-again:
- if (signal_pending(current)) {
- status = -ERESTARTSYS;
- goto bail;
- }
-
- spin_lock(&lockres->l_lock);
-
- /* We only compare against the currently granted level
- * here. If the lock is blocked waiting on a downconvert,
- * we'll get caught below. */
- if ((lockres->l_flags & USER_LOCK_BUSY) &&
- (level > lockres->l_level)) {
- /* is someone sitting in dlm_lock? If so, wait on
- * them. */
- spin_unlock(&lockres->l_lock);
-
- user_wait_on_busy_lock(lockres);
- goto again;
- }
-
- if ((lockres->l_flags & USER_LOCK_BLOCKED) &&
- (!user_may_continue_on_blocked_lock(lockres, level))) {
- /* is the lock is currently blocked on behalf of
- * another node */
- spin_unlock(&lockres->l_lock);
-
- user_wait_on_blocked_lock(lockres);
- goto again;
- }
-
- if (level > lockres->l_level) {
- local_flags = lkm_flags | LKM_VALBLK;
- if (lockres->l_level != LKM_IVMODE)
- local_flags |= LKM_CONVERT;
-
- lockres->l_requested = level;
- lockres->l_flags |= USER_LOCK_BUSY;
- spin_unlock(&lockres->l_lock);
-
- BUG_ON(level == LKM_IVMODE);
- BUG_ON(level == LKM_NLMODE);
-
- /* call dlm_lock to upgrade lock now */
- status = dlmlock(dlm,
- level,
- &lockres->l_lksb,
- local_flags,
- lockres->l_name,
- lockres->l_namelen,
- user_ast,
- lockres,
- user_bast);
- if (status != DLM_NORMAL) {
- if ((lkm_flags & LKM_NOQUEUE) &&
- (status == DLM_NOTQUEUED))
- status = -EAGAIN;
- else {
- user_log_dlm_error("dlmlock", status, lockres);
- status = -EINVAL;
- }
- user_recover_from_dlm_error(lockres);
- goto bail;
- }
-
- user_wait_on_busy_lock(lockres);
- goto again;
- }
-
- user_dlm_inc_holders(lockres, level);
- spin_unlock(&lockres->l_lock);
-
- status = 0;
-bail:
- return status;
-}
-
-static inline void user_dlm_dec_holders(struct user_lock_res *lockres,
- int level)
-{
- switch(level) {
- case LKM_EXMODE:
- BUG_ON(!lockres->l_ex_holders);
- lockres->l_ex_holders--;
- break;
- case LKM_PRMODE:
- BUG_ON(!lockres->l_ro_holders);
- lockres->l_ro_holders--;
- break;
- default:
- BUG();
- }
-}
-
-void user_dlm_cluster_unlock(struct user_lock_res *lockres,
- int level)
-{
- if (level != LKM_EXMODE &&
- level != LKM_PRMODE) {
- mlog(ML_ERROR, "lockres %.*s: invalid request!\n",
- lockres->l_namelen, lockres->l_name);
- return;
- }
-
- spin_lock(&lockres->l_lock);
- user_dlm_dec_holders(lockres, level);
- __user_dlm_cond_queue_lockres(lockres);
- spin_unlock(&lockres->l_lock);
-}
-
-void user_dlm_write_lvb(struct inode *inode,
- const char *val,
- unsigned int len)
-{
- struct user_lock_res *lockres = &DLMFS_I(inode)->ip_lockres;
- char *lvb = lockres->l_lksb.lvb;
-
- BUG_ON(len > DLM_LVB_LEN);
-
- spin_lock(&lockres->l_lock);
-
- BUG_ON(lockres->l_level < LKM_EXMODE);
- memcpy(lvb, val, len);
-
- spin_unlock(&lockres->l_lock);
-}
-
-void user_dlm_read_lvb(struct inode *inode,
- char *val,
- unsigned int len)
-{
- struct user_lock_res *lockres = &DLMFS_I(inode)->ip_lockres;
- char *lvb = lockres->l_lksb.lvb;
-
- BUG_ON(len > DLM_LVB_LEN);
-
- spin_lock(&lockres->l_lock);
-
- BUG_ON(lockres->l_level < LKM_PRMODE);
- memcpy(val, lvb, len);
-
- spin_unlock(&lockres->l_lock);
-}
-
-void user_dlm_lock_res_init(struct user_lock_res *lockres,
- struct dentry *dentry)
-{
- memset(lockres, 0, sizeof(*lockres));
-
- spin_lock_init(&lockres->l_lock);
- init_waitqueue_head(&lockres->l_event);
- lockres->l_level = LKM_IVMODE;
- lockres->l_requested = LKM_IVMODE;
- lockres->l_blocking = LKM_IVMODE;
-
- /* should have been checked before getting here. */
- BUG_ON(dentry->d_name.len >= USER_DLM_LOCK_ID_MAX_LEN);
-
- memcpy(lockres->l_name,
- dentry->d_name.name,
- dentry->d_name.len);
- lockres->l_namelen = dentry->d_name.len;
-}
-
-int user_dlm_destroy_lock(struct user_lock_res *lockres)
-{
- int status = -EBUSY;
- struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres);
-
- mlog(0, "asked to destroy %.*s\n", lockres->l_namelen, lockres->l_name);
-
- spin_lock(&lockres->l_lock);
- if (lockres->l_flags & USER_LOCK_IN_TEARDOWN) {
- spin_unlock(&lockres->l_lock);
- return 0;
- }
-
- lockres->l_flags |= USER_LOCK_IN_TEARDOWN;
-
- while (lockres->l_flags & USER_LOCK_BUSY) {
- spin_unlock(&lockres->l_lock);
-
- user_wait_on_busy_lock(lockres);
-
- spin_lock(&lockres->l_lock);
- }
-
- if (lockres->l_ro_holders || lockres->l_ex_holders) {
- spin_unlock(&lockres->l_lock);
- goto bail;
- }
-
- status = 0;
- if (!(lockres->l_flags & USER_LOCK_ATTACHED)) {
- spin_unlock(&lockres->l_lock);
- goto bail;
- }
-
- lockres->l_flags &= ~USER_LOCK_ATTACHED;
- lockres->l_flags |= USER_LOCK_BUSY;
- spin_unlock(&lockres->l_lock);
-
- status = dlmunlock(dlm,
- &lockres->l_lksb,
- LKM_VALBLK,
- user_unlock_ast,
- lockres);
- if (status != DLM_NORMAL) {
- user_log_dlm_error("dlmunlock", status, lockres);
- status = -EINVAL;
- goto bail;
- }
-
- user_wait_on_busy_lock(lockres);
-
- status = 0;
-bail:
- return status;
-}
-
-struct dlm_ctxt *user_dlm_register_context(struct qstr *name,
- struct dlm_protocol_version *proto)
-{
- struct dlm_ctxt *dlm;
- u32 dlm_key;
- char *domain;
-
- domain = kmalloc(name->len + 1, GFP_NOFS);
- if (!domain) {
- mlog_errno(-ENOMEM);
- return ERR_PTR(-ENOMEM);
- }
-
- dlm_key = crc32_le(0, name->name, name->len);
-
- snprintf(domain, name->len + 1, "%.*s", name->len, name->name);
-
- dlm = dlm_register_domain(domain, dlm_key, proto);
- if (IS_ERR(dlm))
- mlog_errno(PTR_ERR(dlm));
-
- kfree(domain);
- return dlm;
-}
-
-void user_dlm_unregister_context(struct dlm_ctxt *dlm)
-{
- dlm_unregister_domain(dlm);
-}
+++ /dev/null
-/* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * userdlm.h
- *
- * Userspace dlm defines
- *
- * Copyright (C) 2002, 2004 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program 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 this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-
-#ifndef USERDLM_H
-#define USERDLM_H
-
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/types.h>
-#include <linux/workqueue.h>
-
-/* user_lock_res->l_flags flags. */
-#define USER_LOCK_ATTACHED (0x00000001) /* we have initialized
- * the lvb */
-#define USER_LOCK_BUSY (0x00000002) /* we are currently in
- * dlm_lock */
-#define USER_LOCK_BLOCKED (0x00000004) /* blocked waiting to
- * downconvert*/
-#define USER_LOCK_IN_TEARDOWN (0x00000008) /* we're currently
- * destroying this
- * lock. */
-#define USER_LOCK_QUEUED (0x00000010) /* lock is on the
- * workqueue */
-#define USER_LOCK_IN_CANCEL (0x00000020)
-
-struct user_lock_res {
- spinlock_t l_lock;
-
- int l_flags;
-
-#define USER_DLM_LOCK_ID_MAX_LEN 32
- char l_name[USER_DLM_LOCK_ID_MAX_LEN];
- int l_namelen;
- int l_level;
- unsigned int l_ro_holders;
- unsigned int l_ex_holders;
- struct dlm_lockstatus l_lksb;
-
- int l_requested;
- int l_blocking;
-
- wait_queue_head_t l_event;
-
- struct work_struct l_work;
-};
-
-extern struct workqueue_struct *user_dlm_worker;
-
-void user_dlm_lock_res_init(struct user_lock_res *lockres,
- struct dentry *dentry);
-int user_dlm_destroy_lock(struct user_lock_res *lockres);
-int user_dlm_cluster_lock(struct user_lock_res *lockres,
- int level,
- int lkm_flags);
-void user_dlm_cluster_unlock(struct user_lock_res *lockres,
- int level);
-void user_dlm_write_lvb(struct inode *inode,
- const char *val,
- unsigned int len);
-void user_dlm_read_lvb(struct inode *inode,
- char *val,
- unsigned int len);
-struct dlm_ctxt *user_dlm_register_context(struct qstr *name,
- struct dlm_protocol_version *proto);
-void user_dlm_unregister_context(struct dlm_ctxt *dlm);
-
-struct dlmfs_inode_private {
- struct dlm_ctxt *ip_dlm;
-
- struct user_lock_res ip_lockres; /* unused for directories. */
- struct inode *ip_parent;
-
- struct inode ip_vfs_inode;
-};
-
-static inline struct dlmfs_inode_private *
-DLMFS_I(struct inode *inode)
-{
- return container_of(inode,
- struct dlmfs_inode_private,
- ip_vfs_inode);
-}
-
-struct dlmfs_filp_private {
- int fp_lock_level;
-};
-
-#define DLMFS_MAGIC 0x76a9f425
-
-#endif /* USERDLM_H */
--- /dev/null
+EXTRA_CFLAGS += -Ifs/ocfs2
+
+obj-$(CONFIG_OCFS2_FS) += ocfs2_dlmfs.o
+
+ocfs2_dlmfs-objs := userdlm.o dlmfs.o dlmfsver.o
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmfs.c
+ *
+ * Code which implements the kernel side of a minimal userspace
+ * interface to our DLM. This file handles the virtual file system
+ * used for communication with userspace. Credit should go to ramfs,
+ * which was a template for the fs side of this module.
+ *
+ * Copyright (C) 2003, 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+/* Simple VFS hooks based on: */
+/*
+ * Resizable simple ram filesystem for Linux.
+ *
+ * Copyright (C) 2000 Linus Torvalds.
+ * 2000 Transmeta Corp.
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/highmem.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/backing-dev.h>
+#include <linux/poll.h>
+
+#include <asm/uaccess.h>
+
+
+#include "cluster/nodemanager.h"
+#include "cluster/heartbeat.h"
+#include "cluster/tcp.h"
+
+#include "dlm/dlmapi.h"
+
+#include "userdlm.h"
+
+#include "dlmfsver.h"
+
+#define MLOG_MASK_PREFIX ML_DLMFS
+#include "cluster/masklog.h"
+
+#include "ocfs2_lockingver.h"
+
+static const struct super_operations dlmfs_ops;
+static const struct file_operations dlmfs_file_operations;
+static const struct inode_operations dlmfs_dir_inode_operations;
+static const struct inode_operations dlmfs_root_inode_operations;
+static const struct inode_operations dlmfs_file_inode_operations;
+static struct kmem_cache *dlmfs_inode_cache;
+
+struct workqueue_struct *user_dlm_worker;
+
+/*
+ * This is the userdlmfs locking protocol version.
+ *
+ * See fs/ocfs2/dlmglue.c for more details on locking versions.
+ */
+static const struct dlm_protocol_version user_locking_protocol = {
+ .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR,
+ .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR,
+};
+
+
+/*
+ * These are the ABI capabilities of dlmfs.
+ *
+ * Over time, dlmfs has added some features that were not part of the
+ * initial ABI. Unfortunately, some of these features are not detectable
+ * via standard usage. For example, Linux's default poll always returns
+ * POLLIN, so there is no way for a caller of poll(2) to know when dlmfs
+ * added poll support. Instead, we provide this list of new capabilities.
+ *
+ * Capabilities is a read-only attribute. We do it as a module parameter
+ * so we can discover it whether dlmfs is built in, loaded, or even not
+ * loaded.
+ *
+ * The ABI features are local to this machine's dlmfs mount. This is
+ * distinct from the locking protocol, which is concerned with inter-node
+ * interaction.
+ *
+ * Capabilities:
+ * - bast : POLLIN against the file descriptor of a held lock
+ * signifies a bast fired on the lock.
+ */
+#define DLMFS_CAPABILITIES "bast"
+extern int param_set_dlmfs_capabilities(const char *val,
+ struct kernel_param *kp)
+{
+ printk(KERN_ERR "%s: readonly parameter\n", kp->name);
+ return -EINVAL;
+}
+static int param_get_dlmfs_capabilities(char *buffer,
+ struct kernel_param *kp)
+{
+ return strlcpy(buffer, DLMFS_CAPABILITIES,
+ strlen(DLMFS_CAPABILITIES) + 1);
+}
+module_param_call(capabilities, param_set_dlmfs_capabilities,
+ param_get_dlmfs_capabilities, NULL, 0444);
+MODULE_PARM_DESC(capabilities, DLMFS_CAPABILITIES);
+
+
+/*
+ * decodes a set of open flags into a valid lock level and a set of flags.
+ * returns < 0 if we have invalid flags
+ * flags which mean something to us:
+ * O_RDONLY -> PRMODE level
+ * O_WRONLY -> EXMODE level
+ *
+ * O_NONBLOCK -> LKM_NOQUEUE
+ */
+static int dlmfs_decode_open_flags(int open_flags,
+ int *level,
+ int *flags)
+{
+ if (open_flags & (O_WRONLY|O_RDWR))
+ *level = LKM_EXMODE;
+ else
+ *level = LKM_PRMODE;
+
+ *flags = 0;
+ if (open_flags & O_NONBLOCK)
+ *flags |= LKM_NOQUEUE;
+
+ return 0;
+}
+
+static int dlmfs_file_open(struct inode *inode,
+ struct file *file)
+{
+ int status, level, flags;
+ struct dlmfs_filp_private *fp = NULL;
+ struct dlmfs_inode_private *ip;
+
+ if (S_ISDIR(inode->i_mode))
+ BUG();
+
+ mlog(0, "open called on inode %lu, flags 0x%x\n", inode->i_ino,
+ file->f_flags);
+
+ status = dlmfs_decode_open_flags(file->f_flags, &level, &flags);
+ if (status < 0)
+ goto bail;
+
+ /* We don't want to honor O_APPEND at read/write time as it
+ * doesn't make sense for LVB writes. */
+ file->f_flags &= ~O_APPEND;
+
+ fp = kmalloc(sizeof(*fp), GFP_NOFS);
+ if (!fp) {
+ status = -ENOMEM;
+ goto bail;
+ }
+ fp->fp_lock_level = level;
+
+ ip = DLMFS_I(inode);
+
+ status = user_dlm_cluster_lock(&ip->ip_lockres, level, flags);
+ if (status < 0) {
+ /* this is a strange error to return here but I want
+ * to be able userspace to be able to distinguish a
+ * valid lock request from one that simply couldn't be
+ * granted. */
+ if (flags & LKM_NOQUEUE && status == -EAGAIN)
+ status = -ETXTBSY;
+ kfree(fp);
+ goto bail;
+ }
+
+ file->private_data = fp;
+bail:
+ return status;
+}
+
+static int dlmfs_file_release(struct inode *inode,
+ struct file *file)
+{
+ int level, status;
+ struct dlmfs_inode_private *ip = DLMFS_I(inode);
+ struct dlmfs_filp_private *fp =
+ (struct dlmfs_filp_private *) file->private_data;
+
+ if (S_ISDIR(inode->i_mode))
+ BUG();
+
+ mlog(0, "close called on inode %lu\n", inode->i_ino);
+
+ status = 0;
+ if (fp) {
+ level = fp->fp_lock_level;
+ if (level != LKM_IVMODE)
+ user_dlm_cluster_unlock(&ip->ip_lockres, level);
+
+ kfree(fp);
+ file->private_data = NULL;
+ }
+
+ return 0;
+}
+
+static unsigned int dlmfs_file_poll(struct file *file, poll_table *wait)
+{
+ int event = 0;
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct dlmfs_inode_private *ip = DLMFS_I(inode);
+
+ poll_wait(file, &ip->ip_lockres.l_event, wait);
+
+ spin_lock(&ip->ip_lockres.l_lock);
+ if (ip->ip_lockres.l_flags & USER_LOCK_BLOCKED)
+ event = POLLIN | POLLRDNORM;
+ spin_unlock(&ip->ip_lockres.l_lock);
+
+ return event;
+}
+
+static ssize_t dlmfs_file_read(struct file *filp,
+ char __user *buf,
+ size_t count,
+ loff_t *ppos)
+{
+ int bytes_left;
+ ssize_t readlen;
+ char *lvb_buf;
+ struct inode *inode = filp->f_path.dentry->d_inode;
+
+ mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
+ inode->i_ino, count, *ppos);
+
+ if (*ppos >= i_size_read(inode))
+ return 0;
+
+ if (!count)
+ return 0;
+
+ if (!access_ok(VERIFY_WRITE, buf, count))
+ return -EFAULT;
+
+ /* don't read past the lvb */
+ if ((count + *ppos) > i_size_read(inode))
+ readlen = i_size_read(inode) - *ppos;
+ else
+ readlen = count - *ppos;
+
+ lvb_buf = kmalloc(readlen, GFP_NOFS);
+ if (!lvb_buf)
+ return -ENOMEM;
+
+ user_dlm_read_lvb(inode, lvb_buf, readlen);
+ bytes_left = __copy_to_user(buf, lvb_buf, readlen);
+ readlen -= bytes_left;
+
+ kfree(lvb_buf);
+
+ *ppos = *ppos + readlen;
+
+ mlog(0, "read %zd bytes\n", readlen);
+ return readlen;
+}
+
+static ssize_t dlmfs_file_write(struct file *filp,
+ const char __user *buf,
+ size_t count,
+ loff_t *ppos)
+{
+ int bytes_left;
+ ssize_t writelen;
+ char *lvb_buf;
+ struct inode *inode = filp->f_path.dentry->d_inode;
+
+ mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
+ inode->i_ino, count, *ppos);
+
+ if (*ppos >= i_size_read(inode))
+ return -ENOSPC;
+
+ if (!count)
+ return 0;
+
+ if (!access_ok(VERIFY_READ, buf, count))
+ return -EFAULT;
+
+ /* don't write past the lvb */
+ if ((count + *ppos) > i_size_read(inode))
+ writelen = i_size_read(inode) - *ppos;
+ else
+ writelen = count - *ppos;
+
+ lvb_buf = kmalloc(writelen, GFP_NOFS);
+ if (!lvb_buf)
+ return -ENOMEM;
+
+ bytes_left = copy_from_user(lvb_buf, buf, writelen);
+ writelen -= bytes_left;
+ if (writelen)
+ user_dlm_write_lvb(inode, lvb_buf, writelen);
+
+ kfree(lvb_buf);
+
+ *ppos = *ppos + writelen;
+ mlog(0, "wrote %zd bytes\n", writelen);
+ return writelen;
+}
+
+static void dlmfs_init_once(void *foo)
+{
+ struct dlmfs_inode_private *ip =
+ (struct dlmfs_inode_private *) foo;
+
+ ip->ip_dlm = NULL;
+ ip->ip_parent = NULL;
+
+ inode_init_once(&ip->ip_vfs_inode);
+}
+
+static struct inode *dlmfs_alloc_inode(struct super_block *sb)
+{
+ struct dlmfs_inode_private *ip;
+
+ ip = kmem_cache_alloc(dlmfs_inode_cache, GFP_NOFS);
+ if (!ip)
+ return NULL;
+
+ return &ip->ip_vfs_inode;
+}
+
+static void dlmfs_destroy_inode(struct inode *inode)
+{
+ kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode));
+}
+
+static void dlmfs_clear_inode(struct inode *inode)
+{
+ int status;
+ struct dlmfs_inode_private *ip;
+
+ if (!inode)
+ return;
+
+ mlog(0, "inode %lu\n", inode->i_ino);
+
+ ip = DLMFS_I(inode);
+
+ if (S_ISREG(inode->i_mode)) {
+ status = user_dlm_destroy_lock(&ip->ip_lockres);
+ if (status < 0)
+ mlog_errno(status);
+ iput(ip->ip_parent);
+ goto clear_fields;
+ }
+
+ mlog(0, "we're a directory, ip->ip_dlm = 0x%p\n", ip->ip_dlm);
+ /* we must be a directory. If required, lets unregister the
+ * dlm context now. */
+ if (ip->ip_dlm)
+ user_dlm_unregister_context(ip->ip_dlm);
+clear_fields:
+ ip->ip_parent = NULL;
+ ip->ip_dlm = NULL;
+}
+
+static struct backing_dev_info dlmfs_backing_dev_info = {
+ .name = "ocfs2-dlmfs",
+ .ra_pages = 0, /* No readahead */
+ .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
+};
+
+static struct inode *dlmfs_get_root_inode(struct super_block *sb)
+{
+ struct inode *inode = new_inode(sb);
+ int mode = S_IFDIR | 0755;
+ struct dlmfs_inode_private *ip;
+
+ if (inode) {
+ ip = DLMFS_I(inode);
+
+ inode->i_mode = mode;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
+ inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+ inc_nlink(inode);
+
+ inode->i_fop = &simple_dir_operations;
+ inode->i_op = &dlmfs_root_inode_operations;
+ }
+
+ return inode;
+}
+
+static struct inode *dlmfs_get_inode(struct inode *parent,
+ struct dentry *dentry,
+ int mode)
+{
+ struct super_block *sb = parent->i_sb;
+ struct inode * inode = new_inode(sb);
+ struct dlmfs_inode_private *ip;
+
+ if (!inode)
+ return NULL;
+
+ inode->i_mode = mode;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
+ inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+
+ ip = DLMFS_I(inode);
+ ip->ip_dlm = DLMFS_I(parent)->ip_dlm;
+
+ switch (mode & S_IFMT) {
+ default:
+ /* for now we don't support anything other than
+ * directories and regular files. */
+ BUG();
+ break;
+ case S_IFREG:
+ inode->i_op = &dlmfs_file_inode_operations;
+ inode->i_fop = &dlmfs_file_operations;
+
+ i_size_write(inode, DLM_LVB_LEN);
+
+ user_dlm_lock_res_init(&ip->ip_lockres, dentry);
+
+ /* released at clear_inode time, this insures that we
+ * get to drop the dlm reference on each lock *before*
+ * we call the unregister code for releasing parent
+ * directories. */
+ ip->ip_parent = igrab(parent);
+ BUG_ON(!ip->ip_parent);
+ break;
+ case S_IFDIR:
+ inode->i_op = &dlmfs_dir_inode_operations;
+ inode->i_fop = &simple_dir_operations;
+
+ /* directory inodes start off with i_nlink ==
+ * 2 (for "." entry) */
+ inc_nlink(inode);
+ break;
+ }
+
+ if (parent->i_mode & S_ISGID) {
+ inode->i_gid = parent->i_gid;
+ if (S_ISDIR(mode))
+ inode->i_mode |= S_ISGID;
+ }
+
+ return inode;
+}
+
+/*
+ * File creation. Allocate an inode, and we're done..
+ */
+/* SMP-safe */
+static int dlmfs_mkdir(struct inode * dir,
+ struct dentry * dentry,
+ int mode)
+{
+ int status;
+ struct inode *inode = NULL;
+ struct qstr *domain = &dentry->d_name;
+ struct dlmfs_inode_private *ip;
+ struct dlm_ctxt *dlm;
+ struct dlm_protocol_version proto = user_locking_protocol;
+
+ mlog(0, "mkdir %.*s\n", domain->len, domain->name);
+
+ /* verify that we have a proper domain */
+ if (domain->len >= O2NM_MAX_NAME_LEN) {
+ status = -EINVAL;
+ mlog(ML_ERROR, "invalid domain name for directory.\n");
+ goto bail;
+ }
+
+ inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR);
+ if (!inode) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ ip = DLMFS_I(inode);
+
+ dlm = user_dlm_register_context(domain, &proto);
+ if (IS_ERR(dlm)) {
+ status = PTR_ERR(dlm);
+ mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n",
+ status, domain->len, domain->name);
+ goto bail;
+ }
+ ip->ip_dlm = dlm;
+
+ inc_nlink(dir);
+ d_instantiate(dentry, inode);
+ dget(dentry); /* Extra count - pin the dentry in core */
+
+ status = 0;
+bail:
+ if (status < 0)
+ iput(inode);
+ return status;
+}
+
+static int dlmfs_create(struct inode *dir,
+ struct dentry *dentry,
+ int mode,
+ struct nameidata *nd)
+{
+ int status = 0;
+ struct inode *inode;
+ struct qstr *name = &dentry->d_name;
+
+ mlog(0, "create %.*s\n", name->len, name->name);
+
+ /* verify name is valid and doesn't contain any dlm reserved
+ * characters */
+ if (name->len >= USER_DLM_LOCK_ID_MAX_LEN ||
+ name->name[0] == '$') {
+ status = -EINVAL;
+ mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len,
+ name->name);
+ goto bail;
+ }
+
+ inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG);
+ if (!inode) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ d_instantiate(dentry, inode);
+ dget(dentry); /* Extra count - pin the dentry in core */
+bail:
+ return status;
+}
+
+static int dlmfs_unlink(struct inode *dir,
+ struct dentry *dentry)
+{
+ int status;
+ struct inode *inode = dentry->d_inode;
+
+ mlog(0, "unlink inode %lu\n", inode->i_ino);
+
+ /* if there are no current holders, or none that are waiting
+ * to acquire a lock, this basically destroys our lockres. */
+ status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres);
+ if (status < 0) {
+ mlog(ML_ERROR, "unlink %.*s, error %d from destroy\n",
+ dentry->d_name.len, dentry->d_name.name, status);
+ goto bail;
+ }
+ status = simple_unlink(dir, dentry);
+bail:
+ return status;
+}
+
+static int dlmfs_fill_super(struct super_block * sb,
+ void * data,
+ int silent)
+{
+ struct inode * inode;
+ struct dentry * root;
+
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ sb->s_blocksize = PAGE_CACHE_SIZE;
+ sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+ sb->s_magic = DLMFS_MAGIC;
+ sb->s_op = &dlmfs_ops;
+ inode = dlmfs_get_root_inode(sb);
+ if (!inode)
+ return -ENOMEM;
+
+ root = d_alloc_root(inode);
+ if (!root) {
+ iput(inode);
+ return -ENOMEM;
+ }
+ sb->s_root = root;
+ return 0;
+}
+
+static const struct file_operations dlmfs_file_operations = {
+ .open = dlmfs_file_open,
+ .release = dlmfs_file_release,
+ .poll = dlmfs_file_poll,
+ .read = dlmfs_file_read,
+ .write = dlmfs_file_write,
+};
+
+static const struct inode_operations dlmfs_dir_inode_operations = {
+ .create = dlmfs_create,
+ .lookup = simple_lookup,
+ .unlink = dlmfs_unlink,
+};
+
+/* this way we can restrict mkdir to only the toplevel of the fs. */
+static const struct inode_operations dlmfs_root_inode_operations = {
+ .lookup = simple_lookup,
+ .mkdir = dlmfs_mkdir,
+ .rmdir = simple_rmdir,
+};
+
+static const struct super_operations dlmfs_ops = {
+ .statfs = simple_statfs,
+ .alloc_inode = dlmfs_alloc_inode,
+ .destroy_inode = dlmfs_destroy_inode,
+ .clear_inode = dlmfs_clear_inode,
+ .drop_inode = generic_delete_inode,
+};
+
+static const struct inode_operations dlmfs_file_inode_operations = {
+ .getattr = simple_getattr,
+};
+
+static int dlmfs_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data, struct vfsmount *mnt)
+{
+ return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super, mnt);
+}
+
+static struct file_system_type dlmfs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "ocfs2_dlmfs",
+ .get_sb = dlmfs_get_sb,
+ .kill_sb = kill_litter_super,
+};
+
+static int __init init_dlmfs_fs(void)
+{
+ int status;
+ int cleanup_inode = 0, cleanup_worker = 0;
+
+ dlmfs_print_version();
+
+ status = bdi_init(&dlmfs_backing_dev_info);
+ if (status)
+ return status;
+
+ dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache",
+ sizeof(struct dlmfs_inode_private),
+ 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ dlmfs_init_once);
+ if (!dlmfs_inode_cache) {
+ status = -ENOMEM;
+ goto bail;
+ }
+ cleanup_inode = 1;
+
+ user_dlm_worker = create_singlethread_workqueue("user_dlm");
+ if (!user_dlm_worker) {
+ status = -ENOMEM;
+ goto bail;
+ }
+ cleanup_worker = 1;
+
+ status = register_filesystem(&dlmfs_fs_type);
+bail:
+ if (status) {
+ if (cleanup_inode)
+ kmem_cache_destroy(dlmfs_inode_cache);
+ if (cleanup_worker)
+ destroy_workqueue(user_dlm_worker);
+ bdi_destroy(&dlmfs_backing_dev_info);
+ } else
+ printk("OCFS2 User DLM kernel interface loaded\n");
+ return status;
+}
+
+static void __exit exit_dlmfs_fs(void)
+{
+ unregister_filesystem(&dlmfs_fs_type);
+
+ flush_workqueue(user_dlm_worker);
+ destroy_workqueue(user_dlm_worker);
+
+ kmem_cache_destroy(dlmfs_inode_cache);
+
+ bdi_destroy(&dlmfs_backing_dev_info);
+}
+
+MODULE_AUTHOR("Oracle");
+MODULE_LICENSE("GPL");
+
+module_init(init_dlmfs_fs)
+module_exit(exit_dlmfs_fs)
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmfsver.c
+ *
+ * version string
+ *
+ * Copyright (C) 2002, 2005 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+#include "dlmfsver.h"
+
+#define DLM_BUILD_VERSION "1.5.0"
+
+#define VERSION_STR "OCFS2 DLMFS " DLM_BUILD_VERSION
+
+void dlmfs_print_version(void)
+{
+ printk(KERN_INFO "%s\n", VERSION_STR);
+}
+
+MODULE_DESCRIPTION(VERSION_STR);
+
+MODULE_VERSION(DLM_BUILD_VERSION);
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmver.h
+ *
+ * Function prototypes
+ *
+ * Copyright (C) 2005 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef DLMFS_VER_H
+#define DLMFS_VER_H
+
+void dlmfs_print_version(void);
+
+#endif /* DLMFS_VER_H */
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * userdlm.c
+ *
+ * Code which implements the kernel side of a minimal userspace
+ * interface to our DLM.
+ *
+ * Many of the functions here are pared down versions of dlmglue.c
+ * functions.
+ *
+ * Copyright (C) 2003, 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/signal.h>
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/crc32.h>
+
+
+#include "cluster/nodemanager.h"
+#include "cluster/heartbeat.h"
+#include "cluster/tcp.h"
+
+#include "dlm/dlmapi.h"
+
+#include "userdlm.h"
+
+#define MLOG_MASK_PREFIX ML_DLMFS
+#include "cluster/masklog.h"
+
+static inline int user_check_wait_flag(struct user_lock_res *lockres,
+ int flag)
+{
+ int ret;
+
+ spin_lock(&lockres->l_lock);
+ ret = lockres->l_flags & flag;
+ spin_unlock(&lockres->l_lock);
+
+ return ret;
+}
+
+static inline void user_wait_on_busy_lock(struct user_lock_res *lockres)
+
+{
+ wait_event(lockres->l_event,
+ !user_check_wait_flag(lockres, USER_LOCK_BUSY));
+}
+
+static inline void user_wait_on_blocked_lock(struct user_lock_res *lockres)
+
+{
+ wait_event(lockres->l_event,
+ !user_check_wait_flag(lockres, USER_LOCK_BLOCKED));
+}
+
+/* I heart container_of... */
+static inline struct dlm_ctxt *
+dlm_ctxt_from_user_lockres(struct user_lock_res *lockres)
+{
+ struct dlmfs_inode_private *ip;
+
+ ip = container_of(lockres,
+ struct dlmfs_inode_private,
+ ip_lockres);
+ return ip->ip_dlm;
+}
+
+static struct inode *
+user_dlm_inode_from_user_lockres(struct user_lock_res *lockres)
+{
+ struct dlmfs_inode_private *ip;
+
+ ip = container_of(lockres,
+ struct dlmfs_inode_private,
+ ip_lockres);
+ return &ip->ip_vfs_inode;
+}
+
+static inline void user_recover_from_dlm_error(struct user_lock_res *lockres)
+{
+ spin_lock(&lockres->l_lock);
+ lockres->l_flags &= ~USER_LOCK_BUSY;
+ spin_unlock(&lockres->l_lock);
+}
+
+#define user_log_dlm_error(_func, _stat, _lockres) do { \
+ mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \
+ "resource %.*s: %s\n", dlm_errname(_stat), _func, \
+ _lockres->l_namelen, _lockres->l_name, dlm_errmsg(_stat)); \
+} while (0)
+
+/* WARNING: This function lives in a world where the only three lock
+ * levels are EX, PR, and NL. It *will* have to be adjusted when more
+ * lock types are added. */
+static inline int user_highest_compat_lock_level(int level)
+{
+ int new_level = LKM_EXMODE;
+
+ if (level == LKM_EXMODE)
+ new_level = LKM_NLMODE;
+ else if (level == LKM_PRMODE)
+ new_level = LKM_PRMODE;
+ return new_level;
+}
+
+static void user_ast(void *opaque)
+{
+ struct user_lock_res *lockres = opaque;
+ struct dlm_lockstatus *lksb;
+
+ mlog(0, "AST fired for lockres %.*s\n", lockres->l_namelen,
+ lockres->l_name);
+
+ spin_lock(&lockres->l_lock);
+
+ lksb = &(lockres->l_lksb);
+ if (lksb->status != DLM_NORMAL) {
+ mlog(ML_ERROR, "lksb status value of %u on lockres %.*s\n",
+ lksb->status, lockres->l_namelen, lockres->l_name);
+ spin_unlock(&lockres->l_lock);
+ return;
+ }
+
+ mlog_bug_on_msg(lockres->l_requested == LKM_IVMODE,
+ "Lockres %.*s, requested ivmode. flags 0x%x\n",
+ lockres->l_namelen, lockres->l_name, lockres->l_flags);
+
+ /* we're downconverting. */
+ if (lockres->l_requested < lockres->l_level) {
+ if (lockres->l_requested <=
+ user_highest_compat_lock_level(lockres->l_blocking)) {
+ lockres->l_blocking = LKM_NLMODE;
+ lockres->l_flags &= ~USER_LOCK_BLOCKED;
+ }
+ }
+
+ lockres->l_level = lockres->l_requested;
+ lockres->l_requested = LKM_IVMODE;
+ lockres->l_flags |= USER_LOCK_ATTACHED;
+ lockres->l_flags &= ~USER_LOCK_BUSY;
+
+ spin_unlock(&lockres->l_lock);
+
+ wake_up(&lockres->l_event);
+}
+
+static inline void user_dlm_grab_inode_ref(struct user_lock_res *lockres)
+{
+ struct inode *inode;
+ inode = user_dlm_inode_from_user_lockres(lockres);
+ if (!igrab(inode))
+ BUG();
+}
+
+static void user_dlm_unblock_lock(struct work_struct *work);
+
+static void __user_dlm_queue_lockres(struct user_lock_res *lockres)
+{
+ if (!(lockres->l_flags & USER_LOCK_QUEUED)) {
+ user_dlm_grab_inode_ref(lockres);
+
+ INIT_WORK(&lockres->l_work, user_dlm_unblock_lock);
+
+ queue_work(user_dlm_worker, &lockres->l_work);
+ lockres->l_flags |= USER_LOCK_QUEUED;
+ }
+}
+
+static void __user_dlm_cond_queue_lockres(struct user_lock_res *lockres)
+{
+ int queue = 0;
+
+ if (!(lockres->l_flags & USER_LOCK_BLOCKED))
+ return;
+
+ switch (lockres->l_blocking) {
+ case LKM_EXMODE:
+ if (!lockres->l_ex_holders && !lockres->l_ro_holders)
+ queue = 1;
+ break;
+ case LKM_PRMODE:
+ if (!lockres->l_ex_holders)
+ queue = 1;
+ break;
+ default:
+ BUG();
+ }
+
+ if (queue)
+ __user_dlm_queue_lockres(lockres);
+}
+
+static void user_bast(void *opaque, int level)
+{
+ struct user_lock_res *lockres = opaque;
+
+ mlog(0, "Blocking AST fired for lockres %.*s. Blocking level %d\n",
+ lockres->l_namelen, lockres->l_name, level);
+
+ spin_lock(&lockres->l_lock);
+ lockres->l_flags |= USER_LOCK_BLOCKED;
+ if (level > lockres->l_blocking)
+ lockres->l_blocking = level;
+
+ __user_dlm_queue_lockres(lockres);
+ spin_unlock(&lockres->l_lock);
+
+ wake_up(&lockres->l_event);
+}
+
+static void user_unlock_ast(void *opaque, enum dlm_status status)
+{
+ struct user_lock_res *lockres = opaque;
+
+ mlog(0, "UNLOCK AST called on lock %.*s\n", lockres->l_namelen,
+ lockres->l_name);
+
+ if (status != DLM_NORMAL && status != DLM_CANCELGRANT)
+ mlog(ML_ERROR, "Dlm returns status %d\n", status);
+
+ spin_lock(&lockres->l_lock);
+ /* The teardown flag gets set early during the unlock process,
+ * so test the cancel flag to make sure that this ast isn't
+ * for a concurrent cancel. */
+ if (lockres->l_flags & USER_LOCK_IN_TEARDOWN
+ && !(lockres->l_flags & USER_LOCK_IN_CANCEL)) {
+ lockres->l_level = LKM_IVMODE;
+ } else if (status == DLM_CANCELGRANT) {
+ /* We tried to cancel a convert request, but it was
+ * already granted. Don't clear the busy flag - the
+ * ast should've done this already. */
+ BUG_ON(!(lockres->l_flags & USER_LOCK_IN_CANCEL));
+ lockres->l_flags &= ~USER_LOCK_IN_CANCEL;
+ goto out_noclear;
+ } else {
+ BUG_ON(!(lockres->l_flags & USER_LOCK_IN_CANCEL));
+ /* Cancel succeeded, we want to re-queue */
+ lockres->l_requested = LKM_IVMODE; /* cancel an
+ * upconvert
+ * request. */
+ lockres->l_flags &= ~USER_LOCK_IN_CANCEL;
+ /* we want the unblock thread to look at it again
+ * now. */
+ if (lockres->l_flags & USER_LOCK_BLOCKED)
+ __user_dlm_queue_lockres(lockres);
+ }
+
+ lockres->l_flags &= ~USER_LOCK_BUSY;
+out_noclear:
+ spin_unlock(&lockres->l_lock);
+
+ wake_up(&lockres->l_event);
+}
+
+static inline void user_dlm_drop_inode_ref(struct user_lock_res *lockres)
+{
+ struct inode *inode;
+ inode = user_dlm_inode_from_user_lockres(lockres);
+ iput(inode);
+}
+
+static void user_dlm_unblock_lock(struct work_struct *work)
+{
+ int new_level, status;
+ struct user_lock_res *lockres =
+ container_of(work, struct user_lock_res, l_work);
+ struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres);
+
+ mlog(0, "processing lockres %.*s\n", lockres->l_namelen,
+ lockres->l_name);
+
+ spin_lock(&lockres->l_lock);
+
+ mlog_bug_on_msg(!(lockres->l_flags & USER_LOCK_QUEUED),
+ "Lockres %.*s, flags 0x%x\n",
+ lockres->l_namelen, lockres->l_name, lockres->l_flags);
+
+ /* notice that we don't clear USER_LOCK_BLOCKED here. If it's
+ * set, we want user_ast clear it. */
+ lockres->l_flags &= ~USER_LOCK_QUEUED;
+
+ /* It's valid to get here and no longer be blocked - if we get
+ * several basts in a row, we might be queued by the first
+ * one, the unblock thread might run and clear the queued
+ * flag, and finally we might get another bast which re-queues
+ * us before our ast for the downconvert is called. */
+ if (!(lockres->l_flags & USER_LOCK_BLOCKED)) {
+ spin_unlock(&lockres->l_lock);
+ goto drop_ref;
+ }
+
+ if (lockres->l_flags & USER_LOCK_IN_TEARDOWN) {
+ spin_unlock(&lockres->l_lock);
+ goto drop_ref;
+ }
+
+ if (lockres->l_flags & USER_LOCK_BUSY) {
+ if (lockres->l_flags & USER_LOCK_IN_CANCEL) {
+ spin_unlock(&lockres->l_lock);
+ goto drop_ref;
+ }
+
+ lockres->l_flags |= USER_LOCK_IN_CANCEL;
+ spin_unlock(&lockres->l_lock);
+
+ status = dlmunlock(dlm,
+ &lockres->l_lksb,
+ LKM_CANCEL,
+ user_unlock_ast,
+ lockres);
+ if (status != DLM_NORMAL)
+ user_log_dlm_error("dlmunlock", status, lockres);
+ goto drop_ref;
+ }
+
+ /* If there are still incompat holders, we can exit safely
+ * without worrying about re-queueing this lock as that will
+ * happen on the last call to user_cluster_unlock. */
+ if ((lockres->l_blocking == LKM_EXMODE)
+ && (lockres->l_ex_holders || lockres->l_ro_holders)) {
+ spin_unlock(&lockres->l_lock);
+ mlog(0, "can't downconvert for ex: ro = %u, ex = %u\n",
+ lockres->l_ro_holders, lockres->l_ex_holders);
+ goto drop_ref;
+ }
+
+ if ((lockres->l_blocking == LKM_PRMODE)
+ && lockres->l_ex_holders) {
+ spin_unlock(&lockres->l_lock);
+ mlog(0, "can't downconvert for pr: ex = %u\n",
+ lockres->l_ex_holders);
+ goto drop_ref;
+ }
+
+ /* yay, we can downconvert now. */
+ new_level = user_highest_compat_lock_level(lockres->l_blocking);
+ lockres->l_requested = new_level;
+ lockres->l_flags |= USER_LOCK_BUSY;
+ mlog(0, "Downconvert lock from %d to %d\n",
+ lockres->l_level, new_level);
+ spin_unlock(&lockres->l_lock);
+
+ /* need lock downconvert request now... */
+ status = dlmlock(dlm,
+ new_level,
+ &lockres->l_lksb,
+ LKM_CONVERT|LKM_VALBLK,
+ lockres->l_name,
+ lockres->l_namelen,
+ user_ast,
+ lockres,
+ user_bast);
+ if (status != DLM_NORMAL) {
+ user_log_dlm_error("dlmlock", status, lockres);
+ user_recover_from_dlm_error(lockres);
+ }
+
+drop_ref:
+ user_dlm_drop_inode_ref(lockres);
+}
+
+static inline void user_dlm_inc_holders(struct user_lock_res *lockres,
+ int level)
+{
+ switch(level) {
+ case LKM_EXMODE:
+ lockres->l_ex_holders++;
+ break;
+ case LKM_PRMODE:
+ lockres->l_ro_holders++;
+ break;
+ default:
+ BUG();
+ }
+}
+
+/* predict what lock level we'll be dropping down to on behalf
+ * of another node, and return true if the currently wanted
+ * level will be compatible with it. */
+static inline int
+user_may_continue_on_blocked_lock(struct user_lock_res *lockres,
+ int wanted)
+{
+ BUG_ON(!(lockres->l_flags & USER_LOCK_BLOCKED));
+
+ return wanted <= user_highest_compat_lock_level(lockres->l_blocking);
+}
+
+int user_dlm_cluster_lock(struct user_lock_res *lockres,
+ int level,
+ int lkm_flags)
+{
+ int status, local_flags;
+ struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres);
+
+ if (level != LKM_EXMODE &&
+ level != LKM_PRMODE) {
+ mlog(ML_ERROR, "lockres %.*s: invalid request!\n",
+ lockres->l_namelen, lockres->l_name);
+ status = -EINVAL;
+ goto bail;
+ }
+
+ mlog(0, "lockres %.*s: asking for %s lock, passed flags = 0x%x\n",
+ lockres->l_namelen, lockres->l_name,
+ (level == LKM_EXMODE) ? "LKM_EXMODE" : "LKM_PRMODE",
+ lkm_flags);
+
+again:
+ if (signal_pending(current)) {
+ status = -ERESTARTSYS;
+ goto bail;
+ }
+
+ spin_lock(&lockres->l_lock);
+
+ /* We only compare against the currently granted level
+ * here. If the lock is blocked waiting on a downconvert,
+ * we'll get caught below. */
+ if ((lockres->l_flags & USER_LOCK_BUSY) &&
+ (level > lockres->l_level)) {
+ /* is someone sitting in dlm_lock? If so, wait on
+ * them. */
+ spin_unlock(&lockres->l_lock);
+
+ user_wait_on_busy_lock(lockres);
+ goto again;
+ }
+
+ if ((lockres->l_flags & USER_LOCK_BLOCKED) &&
+ (!user_may_continue_on_blocked_lock(lockres, level))) {
+ /* is the lock is currently blocked on behalf of
+ * another node */
+ spin_unlock(&lockres->l_lock);
+
+ user_wait_on_blocked_lock(lockres);
+ goto again;
+ }
+
+ if (level > lockres->l_level) {
+ local_flags = lkm_flags | LKM_VALBLK;
+ if (lockres->l_level != LKM_IVMODE)
+ local_flags |= LKM_CONVERT;
+
+ lockres->l_requested = level;
+ lockres->l_flags |= USER_LOCK_BUSY;
+ spin_unlock(&lockres->l_lock);
+
+ BUG_ON(level == LKM_IVMODE);
+ BUG_ON(level == LKM_NLMODE);
+
+ /* call dlm_lock to upgrade lock now */
+ status = dlmlock(dlm,
+ level,
+ &lockres->l_lksb,
+ local_flags,
+ lockres->l_name,
+ lockres->l_namelen,
+ user_ast,
+ lockres,
+ user_bast);
+ if (status != DLM_NORMAL) {
+ if ((lkm_flags & LKM_NOQUEUE) &&
+ (status == DLM_NOTQUEUED))
+ status = -EAGAIN;
+ else {
+ user_log_dlm_error("dlmlock", status, lockres);
+ status = -EINVAL;
+ }
+ user_recover_from_dlm_error(lockres);
+ goto bail;
+ }
+
+ user_wait_on_busy_lock(lockres);
+ goto again;
+ }
+
+ user_dlm_inc_holders(lockres, level);
+ spin_unlock(&lockres->l_lock);
+
+ status = 0;
+bail:
+ return status;
+}
+
+static inline void user_dlm_dec_holders(struct user_lock_res *lockres,
+ int level)
+{
+ switch(level) {
+ case LKM_EXMODE:
+ BUG_ON(!lockres->l_ex_holders);
+ lockres->l_ex_holders--;
+ break;
+ case LKM_PRMODE:
+ BUG_ON(!lockres->l_ro_holders);
+ lockres->l_ro_holders--;
+ break;
+ default:
+ BUG();
+ }
+}
+
+void user_dlm_cluster_unlock(struct user_lock_res *lockres,
+ int level)
+{
+ if (level != LKM_EXMODE &&
+ level != LKM_PRMODE) {
+ mlog(ML_ERROR, "lockres %.*s: invalid request!\n",
+ lockres->l_namelen, lockres->l_name);
+ return;
+ }
+
+ spin_lock(&lockres->l_lock);
+ user_dlm_dec_holders(lockres, level);
+ __user_dlm_cond_queue_lockres(lockres);
+ spin_unlock(&lockres->l_lock);
+}
+
+void user_dlm_write_lvb(struct inode *inode,
+ const char *val,
+ unsigned int len)
+{
+ struct user_lock_res *lockres = &DLMFS_I(inode)->ip_lockres;
+ char *lvb = lockres->l_lksb.lvb;
+
+ BUG_ON(len > DLM_LVB_LEN);
+
+ spin_lock(&lockres->l_lock);
+
+ BUG_ON(lockres->l_level < LKM_EXMODE);
+ memcpy(lvb, val, len);
+
+ spin_unlock(&lockres->l_lock);
+}
+
+void user_dlm_read_lvb(struct inode *inode,
+ char *val,
+ unsigned int len)
+{
+ struct user_lock_res *lockres = &DLMFS_I(inode)->ip_lockres;
+ char *lvb = lockres->l_lksb.lvb;
+
+ BUG_ON(len > DLM_LVB_LEN);
+
+ spin_lock(&lockres->l_lock);
+
+ BUG_ON(lockres->l_level < LKM_PRMODE);
+ memcpy(val, lvb, len);
+
+ spin_unlock(&lockres->l_lock);
+}
+
+void user_dlm_lock_res_init(struct user_lock_res *lockres,
+ struct dentry *dentry)
+{
+ memset(lockres, 0, sizeof(*lockres));
+
+ spin_lock_init(&lockres->l_lock);
+ init_waitqueue_head(&lockres->l_event);
+ lockres->l_level = LKM_IVMODE;
+ lockres->l_requested = LKM_IVMODE;
+ lockres->l_blocking = LKM_IVMODE;
+
+ /* should have been checked before getting here. */
+ BUG_ON(dentry->d_name.len >= USER_DLM_LOCK_ID_MAX_LEN);
+
+ memcpy(lockres->l_name,
+ dentry->d_name.name,
+ dentry->d_name.len);
+ lockres->l_namelen = dentry->d_name.len;
+}
+
+int user_dlm_destroy_lock(struct user_lock_res *lockres)
+{
+ int status = -EBUSY;
+ struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres);
+
+ mlog(0, "asked to destroy %.*s\n", lockres->l_namelen, lockres->l_name);
+
+ spin_lock(&lockres->l_lock);
+ if (lockres->l_flags & USER_LOCK_IN_TEARDOWN) {
+ spin_unlock(&lockres->l_lock);
+ return 0;
+ }
+
+ lockres->l_flags |= USER_LOCK_IN_TEARDOWN;
+
+ while (lockres->l_flags & USER_LOCK_BUSY) {
+ spin_unlock(&lockres->l_lock);
+
+ user_wait_on_busy_lock(lockres);
+
+ spin_lock(&lockres->l_lock);
+ }
+
+ if (lockres->l_ro_holders || lockres->l_ex_holders) {
+ spin_unlock(&lockres->l_lock);
+ goto bail;
+ }
+
+ status = 0;
+ if (!(lockres->l_flags & USER_LOCK_ATTACHED)) {
+ spin_unlock(&lockres->l_lock);
+ goto bail;
+ }
+
+ lockres->l_flags &= ~USER_LOCK_ATTACHED;
+ lockres->l_flags |= USER_LOCK_BUSY;
+ spin_unlock(&lockres->l_lock);
+
+ status = dlmunlock(dlm,
+ &lockres->l_lksb,
+ LKM_VALBLK,
+ user_unlock_ast,
+ lockres);
+ if (status != DLM_NORMAL) {
+ user_log_dlm_error("dlmunlock", status, lockres);
+ status = -EINVAL;
+ goto bail;
+ }
+
+ user_wait_on_busy_lock(lockres);
+
+ status = 0;
+bail:
+ return status;
+}
+
+struct dlm_ctxt *user_dlm_register_context(struct qstr *name,
+ struct dlm_protocol_version *proto)
+{
+ struct dlm_ctxt *dlm;
+ u32 dlm_key;
+ char *domain;
+
+ domain = kmalloc(name->len + 1, GFP_NOFS);
+ if (!domain) {
+ mlog_errno(-ENOMEM);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ dlm_key = crc32_le(0, name->name, name->len);
+
+ snprintf(domain, name->len + 1, "%.*s", name->len, name->name);
+
+ dlm = dlm_register_domain(domain, dlm_key, proto);
+ if (IS_ERR(dlm))
+ mlog_errno(PTR_ERR(dlm));
+
+ kfree(domain);
+ return dlm;
+}
+
+void user_dlm_unregister_context(struct dlm_ctxt *dlm)
+{
+ dlm_unregister_domain(dlm);
+}
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * userdlm.h
+ *
+ * Userspace dlm defines
+ *
+ * Copyright (C) 2002, 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+
+#ifndef USERDLM_H
+#define USERDLM_H
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+/* user_lock_res->l_flags flags. */
+#define USER_LOCK_ATTACHED (0x00000001) /* we have initialized
+ * the lvb */
+#define USER_LOCK_BUSY (0x00000002) /* we are currently in
+ * dlm_lock */
+#define USER_LOCK_BLOCKED (0x00000004) /* blocked waiting to
+ * downconvert*/
+#define USER_LOCK_IN_TEARDOWN (0x00000008) /* we're currently
+ * destroying this
+ * lock. */
+#define USER_LOCK_QUEUED (0x00000010) /* lock is on the
+ * workqueue */
+#define USER_LOCK_IN_CANCEL (0x00000020)
+
+struct user_lock_res {
+ spinlock_t l_lock;
+
+ int l_flags;
+
+#define USER_DLM_LOCK_ID_MAX_LEN 32
+ char l_name[USER_DLM_LOCK_ID_MAX_LEN];
+ int l_namelen;
+ int l_level;
+ unsigned int l_ro_holders;
+ unsigned int l_ex_holders;
+ struct dlm_lockstatus l_lksb;
+
+ int l_requested;
+ int l_blocking;
+
+ wait_queue_head_t l_event;
+
+ struct work_struct l_work;
+};
+
+extern struct workqueue_struct *user_dlm_worker;
+
+void user_dlm_lock_res_init(struct user_lock_res *lockres,
+ struct dentry *dentry);
+int user_dlm_destroy_lock(struct user_lock_res *lockres);
+int user_dlm_cluster_lock(struct user_lock_res *lockres,
+ int level,
+ int lkm_flags);
+void user_dlm_cluster_unlock(struct user_lock_res *lockres,
+ int level);
+void user_dlm_write_lvb(struct inode *inode,
+ const char *val,
+ unsigned int len);
+void user_dlm_read_lvb(struct inode *inode,
+ char *val,
+ unsigned int len);
+struct dlm_ctxt *user_dlm_register_context(struct qstr *name,
+ struct dlm_protocol_version *proto);
+void user_dlm_unregister_context(struct dlm_ctxt *dlm);
+
+struct dlmfs_inode_private {
+ struct dlm_ctxt *ip_dlm;
+
+ struct user_lock_res ip_lockres; /* unused for directories. */
+ struct inode *ip_parent;
+
+ struct inode ip_vfs_inode;
+};
+
+static inline struct dlmfs_inode_private *
+DLMFS_I(struct inode *inode)
+{
+ return container_of(inode,
+ struct dlmfs_inode_private,
+ ip_vfs_inode);
+}
+
+struct dlmfs_filp_private {
+ int fp_lock_level;
+};
+
+#define DLMFS_MAGIC 0x76a9f425
+
+#endif /* USERDLM_H */
projects / deliverable / linux.git / commitdiff
