dlm: allow multiple lockspace creates
Add a count for lockspace create and release so that create can be called multiple times to use the lockspace from different places. Also add the new flag DLM_LSFL_NEWEXCL to create a lockspace with the previous behavior of returning -EEXIST if the lockspace already exists. Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
David Teigland
parent
4c246edd25
commit
0f8e0d9a31
7 changed files with 117 additions and 65 deletions
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@ -2,7 +2,7 @@
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*******************************************************************************
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**
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** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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** Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
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**
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** This copyrighted material is made available to anyone wishing to use,
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** modify, copy, or redistribute it subject to the terms and conditions
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@ -441,7 +441,9 @@ struct dlm_ls {
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uint32_t ls_global_id; /* global unique lockspace ID */
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uint32_t ls_exflags;
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int ls_lvblen;
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int ls_count; /* reference count */
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int ls_count; /* refcount of processes in
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the dlm using this ls */
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int ls_create_count; /* create/release refcount */
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unsigned long ls_flags; /* LSFL_ */
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struct kobject ls_kobj;
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@ -2,7 +2,7 @@
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*******************************************************************************
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**
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** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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** Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
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**
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** This copyrighted material is made available to anyone wishing to use,
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** modify, copy, or redistribute it subject to the terms and conditions
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@ -23,6 +23,7 @@
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#include "lock.h"
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#include "recover.h"
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#include "requestqueue.h"
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#include "user.h"
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static int ls_count;
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static struct mutex ls_lock;
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@ -246,23 +247,6 @@ static void dlm_scand_stop(void)
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kthread_stop(scand_task);
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}
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static struct dlm_ls *dlm_find_lockspace_name(char *name, int namelen)
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{
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struct dlm_ls *ls;
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spin_lock(&lslist_lock);
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list_for_each_entry(ls, &lslist, ls_list) {
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if (ls->ls_namelen == namelen &&
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memcmp(ls->ls_name, name, namelen) == 0)
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goto out;
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}
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ls = NULL;
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out:
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spin_unlock(&lslist_lock);
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return ls;
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}
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struct dlm_ls *dlm_find_lockspace_global(uint32_t id)
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{
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struct dlm_ls *ls;
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@ -327,6 +311,7 @@ static void remove_lockspace(struct dlm_ls *ls)
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for (;;) {
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spin_lock(&lslist_lock);
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if (ls->ls_count == 0) {
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WARN_ON(ls->ls_create_count != 0);
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list_del(&ls->ls_list);
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spin_unlock(&lslist_lock);
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return;
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@ -381,7 +366,7 @@ static int new_lockspace(char *name, int namelen, void **lockspace,
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uint32_t flags, int lvblen)
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{
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struct dlm_ls *ls;
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int i, size, error = -ENOMEM;
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int i, size, error;
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int do_unreg = 0;
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if (namelen > DLM_LOCKSPACE_LEN)
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@ -393,12 +378,32 @@ static int new_lockspace(char *name, int namelen, void **lockspace,
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if (!try_module_get(THIS_MODULE))
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return -EINVAL;
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ls = dlm_find_lockspace_name(name, namelen);
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if (ls) {
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*lockspace = ls;
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error = 0;
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spin_lock(&lslist_lock);
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list_for_each_entry(ls, &lslist, ls_list) {
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WARN_ON(ls->ls_create_count <= 0);
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if (ls->ls_namelen != namelen)
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continue;
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if (memcmp(ls->ls_name, name, namelen))
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continue;
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if (flags & DLM_LSFL_NEWEXCL) {
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error = -EEXIST;
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break;
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}
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ls->ls_create_count++;
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module_put(THIS_MODULE);
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return -EEXIST;
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error = 1; /* not an error, return 0 */
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break;
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}
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spin_unlock(&lslist_lock);
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if (error < 0)
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goto out;
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if (error)
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goto ret_zero;
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error = -ENOMEM;
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ls = kzalloc(sizeof(struct dlm_ls) + namelen, GFP_KERNEL);
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if (!ls)
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@ -418,8 +423,9 @@ static int new_lockspace(char *name, int namelen, void **lockspace,
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ls->ls_allocation = GFP_KERNEL;
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/* ls_exflags are forced to match among nodes, and we don't
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need to require all nodes to have TIMEWARN or FS set */
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ls->ls_exflags = (flags & ~(DLM_LSFL_TIMEWARN | DLM_LSFL_FS));
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need to require all nodes to have some flags set */
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ls->ls_exflags = (flags & ~(DLM_LSFL_TIMEWARN | DLM_LSFL_FS |
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DLM_LSFL_NEWEXCL));
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size = dlm_config.ci_rsbtbl_size;
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ls->ls_rsbtbl_size = size;
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@ -510,6 +516,7 @@ static int new_lockspace(char *name, int namelen, void **lockspace,
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down_write(&ls->ls_in_recovery);
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spin_lock(&lslist_lock);
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ls->ls_create_count = 1;
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list_add(&ls->ls_list, &lslist);
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spin_unlock(&lslist_lock);
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@ -548,7 +555,7 @@ static int new_lockspace(char *name, int namelen, void **lockspace,
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dlm_create_debug_file(ls);
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log_debug(ls, "join complete");
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ret_zero:
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*lockspace = ls;
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return 0;
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@ -635,11 +642,32 @@ static int release_lockspace(struct dlm_ls *ls, int force)
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struct dlm_lkb *lkb;
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struct dlm_rsb *rsb;
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struct list_head *head;
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int i;
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int busy = lockspace_busy(ls);
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int i, busy, rv;
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if (busy > force)
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return -EBUSY;
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busy = lockspace_busy(ls);
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spin_lock(&lslist_lock);
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if (ls->ls_create_count == 1) {
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if (busy > force)
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rv = -EBUSY;
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else {
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/* remove_lockspace takes ls off lslist */
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ls->ls_create_count = 0;
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rv = 0;
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}
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} else if (ls->ls_create_count > 1) {
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rv = --ls->ls_create_count;
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} else {
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rv = -EINVAL;
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}
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spin_unlock(&lslist_lock);
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if (rv) {
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log_debug(ls, "release_lockspace no remove %d", rv);
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return rv;
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}
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dlm_device_deregister(ls);
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if (force < 3)
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do_uevent(ls, 0);
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@ -720,15 +748,10 @@ static int release_lockspace(struct dlm_ls *ls, int force)
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dlm_clear_members(ls);
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dlm_clear_members_gone(ls);
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kfree(ls->ls_node_array);
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log_debug(ls, "release_lockspace final free");
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kobject_put(&ls->ls_kobj);
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/* The ls structure will be freed when the kobject is done with */
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mutex_lock(&ls_lock);
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ls_count--;
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if (!ls_count)
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threads_stop();
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mutex_unlock(&ls_lock);
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module_put(THIS_MODULE);
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return 0;
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}
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@ -750,11 +773,21 @@ static int release_lockspace(struct dlm_ls *ls, int force)
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int dlm_release_lockspace(void *lockspace, int force)
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{
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struct dlm_ls *ls;
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int error;
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ls = dlm_find_lockspace_local(lockspace);
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if (!ls)
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return -EINVAL;
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dlm_put_lockspace(ls);
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return release_lockspace(ls, force);
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mutex_lock(&ls_lock);
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error = release_lockspace(ls, force);
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if (!error)
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ls_count--;
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else if (!ls_count)
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threads_stop();
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mutex_unlock(&ls_lock);
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return error;
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}
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@ -1,5 +1,5 @@
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/*
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* Copyright (C) 2006-2007 Red Hat, Inc. All rights reserved.
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* Copyright (C) 2006-2008 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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@ -340,10 +340,15 @@ static int device_user_deadlock(struct dlm_user_proc *proc,
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return error;
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}
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static int create_misc_device(struct dlm_ls *ls, char *name)
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static int dlm_device_register(struct dlm_ls *ls, char *name)
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{
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int error, len;
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/* The device is already registered. This happens when the
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lockspace is created multiple times from userspace. */
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if (ls->ls_device.name)
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return 0;
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error = -ENOMEM;
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len = strlen(name) + strlen(name_prefix) + 2;
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ls->ls_device.name = kzalloc(len, GFP_KERNEL);
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@ -363,6 +368,22 @@ static int create_misc_device(struct dlm_ls *ls, char *name)
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return error;
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}
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int dlm_device_deregister(struct dlm_ls *ls)
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{
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int error;
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/* The device is not registered. This happens when the lockspace
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was never used from userspace, or when device_create_lockspace()
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calls dlm_release_lockspace() after the register fails. */
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if (!ls->ls_device.name)
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return 0;
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error = misc_deregister(&ls->ls_device);
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if (!error)
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kfree(ls->ls_device.name);
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return error;
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}
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static int device_user_purge(struct dlm_user_proc *proc,
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struct dlm_purge_params *params)
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{
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@ -397,7 +418,7 @@ static int device_create_lockspace(struct dlm_lspace_params *params)
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if (!ls)
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return -ENOENT;
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error = create_misc_device(ls, params->name);
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error = dlm_device_register(ls, params->name);
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dlm_put_lockspace(ls);
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if (error)
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@ -421,31 +442,22 @@ static int device_remove_lockspace(struct dlm_lspace_params *params)
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if (!ls)
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return -ENOENT;
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/* Deregister the misc device first, so we don't have
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* a device that's not attached to a lockspace. If
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* dlm_release_lockspace fails then we can recreate it
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*/
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error = misc_deregister(&ls->ls_device);
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if (error) {
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dlm_put_lockspace(ls);
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goto out;
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}
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kfree(ls->ls_device.name);
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if (params->flags & DLM_USER_LSFLG_FORCEFREE)
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force = 2;
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lockspace = ls->ls_local_handle;
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/* dlm_release_lockspace waits for references to go to zero,
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so all processes will need to close their device for the ls
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before the release will procede */
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dlm_put_lockspace(ls);
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/* The final dlm_release_lockspace waits for references to go to
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zero, so all processes will need to close their device for the
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ls before the release will proceed. release also calls the
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device_deregister above. Converting a positive return value
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from release to zero means that userspace won't know when its
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release was the final one, but it shouldn't need to know. */
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error = dlm_release_lockspace(lockspace, force);
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if (error)
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create_misc_device(ls, ls->ls_name);
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out:
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if (error > 0)
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error = 0;
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return error;
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}
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@ -1,5 +1,5 @@
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/*
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* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
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* Copyright (C) 2006-2008 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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@ -12,5 +12,6 @@
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void dlm_user_add_ast(struct dlm_lkb *lkb, int type);
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int dlm_user_init(void);
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void dlm_user_exit(void);
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int dlm_device_deregister(struct dlm_ls *ls);
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#endif
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@ -144,7 +144,8 @@ static int gdlm_mount(char *table_name, char *host_data,
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error = dlm_new_lockspace(ls->fsname, strlen(ls->fsname),
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&ls->dlm_lockspace,
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DLM_LSFL_FS | (nodir ? DLM_LSFL_NODIR : 0),
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DLM_LSFL_FS | DLM_LSFL_NEWEXCL |
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(nodir ? DLM_LSFL_NODIR : 0),
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GDLM_LVB_SIZE);
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if (error) {
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log_error("dlm_new_lockspace error %d", error);
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@ -2,7 +2,7 @@
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*******************************************************************************
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**
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** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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** Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
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**
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** This copyrighted material is made available to anyone wishing to use,
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** modify, copy, or redistribute it subject to the terms and conditions
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@ -65,9 +65,12 @@ struct dlm_lksb {
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char * sb_lvbptr;
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};
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/* dlm_new_lockspace() flags */
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#define DLM_LSFL_NODIR 0x00000001
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#define DLM_LSFL_TIMEWARN 0x00000002
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#define DLM_LSFL_FS 0x00000004
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#define DLM_LSFL_NEWEXCL 0x00000008
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#ifdef __KERNEL__
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/* Version of the device interface */
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#define DLM_DEVICE_VERSION_MAJOR 6
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#define DLM_DEVICE_VERSION_MINOR 0
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#define DLM_DEVICE_VERSION_PATCH 0
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#define DLM_DEVICE_VERSION_PATCH 1
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/* struct passed to the lock write */
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struct dlm_lock_params {
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