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>

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>
David Teigland
1 parent 4c246edd25
Showing 7 changed files with 116 additions and 64 deletions Side-by-side Diff
fs/dlm/dlm_internal.h
fs/dlm/lockspace.c
fs/dlm/user.c
fs/dlm/user.h
fs/gfs2/locking/dlm/mount.c
include/linux/dlm.h
include/linux/dlm_device.h
@@ -2,7 +2,7 @@
 *******************************************************************************
 **
 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
-**  Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
+**  Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
 **
 **  This copyrighted material is made available to anyone wishing to use,
 **  modify, copy, or redistribute it subject to the terms and conditions
@@ -441,7 +441,9 @@
 	uint32_t		ls_global_id;	/* global unique lockspace ID */
 	uint32_t		ls_exflags;
 	int			ls_lvblen;
-	int			ls_count;	/* reference count */
+	int			ls_count;	/* refcount of processes in
+						   the dlm using this ls */
+	int			ls_create_count; /* create/release refcount */
 	unsigned long		ls_flags;	/* LSFL_ */
 	struct kobject		ls_kobj;
  
@@ -2,7 +2,7 @@
 *******************************************************************************
 **
 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
-**  Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
+**  Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
 **
 **  This copyrighted material is made available to anyone wishing to use,
 **  modify, copy, or redistribute it subject to the terms and conditions
@@ -23,6 +23,7 @@
 #include "lock.h"
 #include "recover.h"
 #include "requestqueue.h"
+#include "user.h"
  
 static int			ls_count;
 static struct mutex		ls_lock;
@@ -246,23 +247,6 @@
 	kthread_stop(scand_task);
 }
  
-static struct dlm_ls *dlm_find_lockspace_name(char *name, int namelen)
-{
-	struct dlm_ls *ls;
-
-	spin_lock(&lslist_lock);
-
-	list_for_each_entry(ls, &lslist, ls_list) {
-		if (ls->ls_namelen == namelen &&
-		    memcmp(ls->ls_name, name, namelen) == 0)
-			goto out;
-	}
-	ls = NULL;
- out:
-	spin_unlock(&lslist_lock);
-	return ls;
-}
-
 struct dlm_ls *dlm_find_lockspace_global(uint32_t id)
 {
 	struct dlm_ls *ls;
@@ -327,6 +311,7 @@
 	for (;;) {
 		spin_lock(&lslist_lock);
 		if (ls->ls_count == 0) {
+			WARN_ON(ls->ls_create_count != 0);
 			list_del(&ls->ls_list);
 			spin_unlock(&lslist_lock);
 			return;
@@ -381,7 +366,7 @@
 			 uint32_t flags, int lvblen)
 {
 	struct dlm_ls *ls;
-	int i, size, error = -ENOMEM;
+	int i, size, error;
 	int do_unreg = 0;
  
 	if (namelen > DLM_LOCKSPACE_LEN)
  
  
  
@@ -393,13 +378,33 @@
 	if (!try_module_get(THIS_MODULE))
 		return -EINVAL;
  
-	ls = dlm_find_lockspace_name(name, namelen);
-	if (ls) {
-		*lockspace = ls;
+	error = 0;
+
+	spin_lock(&lslist_lock);
+	list_for_each_entry(ls, &lslist, ls_list) {
+		WARN_ON(ls->ls_create_count <= 0);
+		if (ls->ls_namelen != namelen)
+			continue;
+		if (memcmp(ls->ls_name, name, namelen))
+			continue;
+		if (flags & DLM_LSFL_NEWEXCL) {
+			error = -EEXIST;
+			break;
+		}
+		ls->ls_create_count++;
 		module_put(THIS_MODULE);
-		return -EEXIST;
+		error = 1; /* not an error, return 0 */
+		break;
 	}
+	spin_unlock(&lslist_lock);
  
+	if (error < 0)
+		goto out;
+	if (error)
+		goto ret_zero;
+
+	error = -ENOMEM;
+
 	ls = kzalloc(sizeof(struct dlm_ls) + namelen, GFP_KERNEL);
 	if (!ls)
 		goto out;
@@ -418,8 +423,9 @@
 		ls->ls_allocation = GFP_KERNEL;
  
 	/* ls_exflags are forced to match among nodes, and we don't
-	   need to require all nodes to have TIMEWARN or FS set */
-	ls->ls_exflags = (flags & ~(DLM_LSFL_TIMEWARN | DLM_LSFL_FS));
+	   need to require all nodes to have some flags set */
+	ls->ls_exflags = (flags & ~(DLM_LSFL_TIMEWARN | DLM_LSFL_FS |
+				    DLM_LSFL_NEWEXCL));
  
 	size = dlm_config.ci_rsbtbl_size;
 	ls->ls_rsbtbl_size = size;
@@ -510,6 +516,7 @@
 	down_write(&ls->ls_in_recovery);
  
 	spin_lock(&lslist_lock);
+	ls->ls_create_count = 1;
 	list_add(&ls->ls_list, &lslist);
 	spin_unlock(&lslist_lock);
  
@@ -548,7 +555,7 @@
 	dlm_create_debug_file(ls);
  
 	log_debug(ls, "join complete");
-
+ ret_zero:
 	*lockspace = ls;
 	return 0;
  
  
  
@@ -635,12 +642,33 @@
 	struct dlm_lkb *lkb;
 	struct dlm_rsb *rsb;
 	struct list_head *head;
-	int i;
-	int busy = lockspace_busy(ls);
+	int i, busy, rv;
  
-	if (busy > force)
-		return -EBUSY;
+	busy = lockspace_busy(ls);
  
+	spin_lock(&lslist_lock);
+	if (ls->ls_create_count == 1) {
+		if (busy > force)
+			rv = -EBUSY;
+		else {
+			/* remove_lockspace takes ls off lslist */
+			ls->ls_create_count = 0;
+			rv = 0;
+		}
+	} else if (ls->ls_create_count > 1) {
+		rv = --ls->ls_create_count;
+	} else {
+		rv = -EINVAL;
+	}
+	spin_unlock(&lslist_lock);
+
+	if (rv) {
+		log_debug(ls, "release_lockspace no remove %d", rv);
+		return rv;
+	}
+
+	dlm_device_deregister(ls);
+
 	if (force < 3)
 		do_uevent(ls, 0);
  
  
@@ -720,15 +748,10 @@
 	dlm_clear_members(ls);
 	dlm_clear_members_gone(ls);
 	kfree(ls->ls_node_array);
+	log_debug(ls, "release_lockspace final free");
 	kobject_put(&ls->ls_kobj);
 	/* The ls structure will be freed when the kobject is done with */
  
-	mutex_lock(&ls_lock);
-	ls_count--;
-	if (!ls_count)
-		threads_stop();
-	mutex_unlock(&ls_lock);
-
 	module_put(THIS_MODULE);
 	return 0;
 }
  
@@ -750,11 +773,21 @@
 int dlm_release_lockspace(void *lockspace, int force)
 {
 	struct dlm_ls *ls;
+	int error;
  
 	ls = dlm_find_lockspace_local(lockspace);
 	if (!ls)
 		return -EINVAL;
 	dlm_put_lockspace(ls);
-	return release_lockspace(ls, force);
+
+	mutex_lock(&ls_lock);
+	error = release_lockspace(ls, force);
+	if (!error)
+		ls_count--;
+	else if (!ls_count)
+		threads_stop();
+	mutex_unlock(&ls_lock);
+
+	return error;
 }
 /*
- * Copyright (C) 2006-2007 Red Hat, Inc.  All rights reserved.
+ * Copyright (C) 2006-2008 Red Hat, Inc.  All rights reserved.
  *
  * This copyrighted material is made available to anyone wishing to use,
  * modify, copy, or redistribute it subject to the terms and conditions
  
@@ -340,10 +340,15 @@
 	return error;
 }
  
-static int create_misc_device(struct dlm_ls *ls, char *name)
+static int dlm_device_register(struct dlm_ls *ls, char *name)
 {
 	int error, len;
  
+	/* The device is already registered.  This happens when the
+	   lockspace is created multiple times from userspace. */
+	if (ls->ls_device.name)
+		return 0;
+
 	error = -ENOMEM;
 	len = strlen(name) + strlen(name_prefix) + 2;
 	ls->ls_device.name = kzalloc(len, GFP_KERNEL);
@@ -363,6 +368,22 @@
 	return error;
 }
  
+int dlm_device_deregister(struct dlm_ls *ls)
+{
+	int error;
+
+	/* The device is not registered.  This happens when the lockspace
+	   was never used from userspace, or when device_create_lockspace()
+	   calls dlm_release_lockspace() after the register fails. */
+	if (!ls->ls_device.name)
+		return 0;
+
+	error = misc_deregister(&ls->ls_device);
+	if (!error)
+		kfree(ls->ls_device.name);
+	return error;
+}
+
 static int device_user_purge(struct dlm_user_proc *proc,
 			     struct dlm_purge_params *params)
 {
@@ -397,7 +418,7 @@
 	if (!ls)
 		return -ENOENT;
  
-	error = create_misc_device(ls, params->name);
+	error = dlm_device_register(ls, params->name);
 	dlm_put_lockspace(ls);
  
 	if (error)
  
  
  
  
@@ -421,31 +442,22 @@
 	if (!ls)
 		return -ENOENT;
  
-	/* Deregister the misc device first, so we don't have
-	 * a device that's not attached to a lockspace. If
-	 * dlm_release_lockspace fails then we can recreate it
-	 */
-	error = misc_deregister(&ls->ls_device);
-	if (error) {
-		dlm_put_lockspace(ls);
-		goto out;
-	}
-	kfree(ls->ls_device.name);
-
 	if (params->flags & DLM_USER_LSFLG_FORCEFREE)
 		force = 2;
  
 	lockspace = ls->ls_local_handle;
+	dlm_put_lockspace(ls);
  
-	/* dlm_release_lockspace waits for references to go to zero,
-	   so all processes will need to close their device for the ls
-	   before the release will procede */
+	/* The final dlm_release_lockspace waits for references to go to
+	   zero, so all processes will need to close their device for the
+	   ls before the release will proceed.  release also calls the
+	   device_deregister above.  Converting a positive return value
+	   from release to zero means that userspace won't know when its
+	   release was the final one, but it shouldn't need to know. */
  
-	dlm_put_lockspace(ls);
 	error = dlm_release_lockspace(lockspace, force);
-	if (error)
-		create_misc_device(ls, ls->ls_name);
- out:
+	if (error > 0)
+		error = 0;
 	return error;
 }
  
 /*
- * Copyright (C) 2006 Red Hat, Inc.  All rights reserved.
+ * Copyright (C) 2006-2008 Red Hat, Inc.  All rights reserved.
  *
  * This copyrighted material is made available to anyone wishing to use,
  * modify, copy, or redistribute it subject to the terms and conditions
@@ -12,6 +12,7 @@
 void dlm_user_add_ast(struct dlm_lkb *lkb, int type);
 int dlm_user_init(void);
 void dlm_user_exit(void);
+int dlm_device_deregister(struct dlm_ls *ls);
  
 #endif
@@ -144,7 +144,8 @@
  
 	error = dlm_new_lockspace(ls->fsname, strlen(ls->fsname),
 				  &ls->dlm_lockspace,
-				  DLM_LSFL_FS | (nodir ? DLM_LSFL_NODIR : 0),
+				  DLM_LSFL_FS | DLM_LSFL_NEWEXCL |
+				  (nodir ? DLM_LSFL_NODIR : 0),
 				  GDLM_LVB_SIZE);
 	if (error) {
 		log_error("dlm_new_lockspace error %d", error);
@@ -2,7 +2,7 @@
 *******************************************************************************
 **
 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
-**  Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
+**  Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
 **
 **  This copyrighted material is made available to anyone wishing to use,
 **  modify, copy, or redistribute it subject to the terms and conditions
  
@@ -65,9 +65,12 @@
 	char *	 sb_lvbptr;
 };
  
+/* dlm_new_lockspace() flags */
+
 #define DLM_LSFL_NODIR		0x00000001
 #define DLM_LSFL_TIMEWARN	0x00000002
 #define DLM_LSFL_FS     	0x00000004
+#define DLM_LSFL_NEWEXCL     	0x00000008
  
 #ifdef __KERNEL__
  
@@ -26,7 +26,7 @@
 /* Version of the device interface */
 #define DLM_DEVICE_VERSION_MAJOR 6
 #define DLM_DEVICE_VERSION_MINOR 0
-#define DLM_DEVICE_VERSION_PATCH 0
+#define DLM_DEVICE_VERSION_PATCH 1
  
 /* struct passed to the lock write */
 struct dlm_lock_params {
...	...	@@ -2,7 +2,7 @@
2	2	*******************************************************************************
3	3	**
4	4	** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5		-** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
	5	+** Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
6	6	**
7	7	** This copyrighted material is made available to anyone wishing to use,
8	8	** modify, copy, or redistribute it subject to the terms and conditions
...	...	@@ -441,7 +441,9 @@
441	441	uint32_t ls_global_id; /* global unique lockspace ID */
442	442	uint32_t ls_exflags;
443	443	int ls_lvblen;
444		- int ls_count; /* reference count */
	444	+ int ls_count; /* refcount of processes in
	445	+ the dlm using this ls */
	446	+ int ls_create_count; /* create/release refcount */
445	447	unsigned long ls_flags; /* LSFL_ */
446	448	struct kobject ls_kobj;
447	449
1	1	/*
2		- * Copyright (C) 2006-2007 Red Hat, Inc. All rights reserved.
	2	+ * Copyright (C) 2006-2008 Red Hat, Inc. All rights reserved.
3	3	*
4	4	* This copyrighted material is made available to anyone wishing to use,
5	5	* modify, copy, or redistribute it subject to the terms and conditions
6	6
...	...	@@ -340,10 +340,15 @@
340	340	return error;
341	341	}
342	342
343		-static int create_misc_device(struct dlm_ls ls, char name)
	343	+static int dlm_device_register(struct dlm_ls ls, char name)
344	344	{
345	345	int error, len;
346	346
	347	+ /* The device is already registered. This happens when the
	348	+ lockspace is created multiple times from userspace. */
	349	+ if (ls->ls_device.name)
	350	+ return 0;
	351	+
347	352	error = -ENOMEM;
348	353	len = strlen(name) + strlen(name_prefix) + 2;
349	354	ls->ls_device.name = kzalloc(len, GFP_KERNEL);
...	...	@@ -363,6 +368,22 @@
363	368	return error;
364	369	}
365	370
	371	+int dlm_device_deregister(struct dlm_ls *ls)
	372	+{
	373	+ int error;
	374	+
	375	+ /* The device is not registered. This happens when the lockspace
	376	+ was never used from userspace, or when device_create_lockspace()
	377	+ calls dlm_release_lockspace() after the register fails. */
	378	+ if (!ls->ls_device.name)
	379	+ return 0;
	380	+
	381	+ error = misc_deregister(&ls->ls_device);
	382	+ if (!error)
	383	+ kfree(ls->ls_device.name);
	384	+ return error;
	385	+}
	386	+
366	387	static int device_user_purge(struct dlm_user_proc *proc,
367	388	struct dlm_purge_params *params)
368	389	{
...	...	@@ -397,7 +418,7 @@
397	418	if (!ls)
398	419	return -ENOENT;
399	420
400		- error = create_misc_device(ls, params->name);
	421	+ error = dlm_device_register(ls, params->name);
401	422	dlm_put_lockspace(ls);
402	423
403	424	if (error)
404	425
405	426
406	427
407	428
...	...	@@ -421,31 +442,22 @@
421	442	if (!ls)
422	443	return -ENOENT;
423	444
424		- /* Deregister the misc device first, so we don't have
425		- * a device that's not attached to a lockspace. If
426		- * dlm_release_lockspace fails then we can recreate it
427		- */
428		- error = misc_deregister(&ls->ls_device);
429		- if (error) {
430		- dlm_put_lockspace(ls);
431		- goto out;
432		- }
433		- kfree(ls->ls_device.name);
434		-
435	445	if (params->flags & DLM_USER_LSFLG_FORCEFREE)
436	446	force = 2;
437	447
438	448	lockspace = ls->ls_local_handle;
	449	+ dlm_put_lockspace(ls);
439	450
440		- /* dlm_release_lockspace waits for references to go to zero,
441		- so all processes will need to close their device for the ls
442		- before the release will procede */
	451	+ /* The final dlm_release_lockspace waits for references to go to
	452	+ zero, so all processes will need to close their device for the
	453	+ ls before the release will proceed. release also calls the
	454	+ device_deregister above. Converting a positive return value
	455	+ from release to zero means that userspace won't know when its
	456	+ release was the final one, but it shouldn't need to know. */
443	457
444		- dlm_put_lockspace(ls);
445	458	error = dlm_release_lockspace(lockspace, force);
446		- if (error)
447		- create_misc_device(ls, ls->ls_name);
448		- out:
	459	+ if (error > 0)
	460	+ error = 0;
449	461	return error;
450	462	}
451	463
1	1	/*
2		- * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
	2	+ * Copyright (C) 2006-2008 Red Hat, Inc. All rights reserved.
3	3	*
4	4	* This copyrighted material is made available to anyone wishing to use,
5	5	* modify, copy, or redistribute it subject to the terms and conditions
...	...	@@ -12,6 +12,7 @@
12	12	void dlm_user_add_ast(struct dlm_lkb *lkb, int type);
13	13	int dlm_user_init(void);
14	14	void dlm_user_exit(void);
	15	+int dlm_device_deregister(struct dlm_ls *ls);
15	16
16	17	#endif
...	...	@@ -144,7 +144,8 @@
144	144
145	145	error = dlm_new_lockspace(ls->fsname, strlen(ls->fsname),
146	146	&ls->dlm_lockspace,
147		- DLM_LSFL_FS \| (nodir ? DLM_LSFL_NODIR : 0),
	147	+ DLM_LSFL_FS \| DLM_LSFL_NEWEXCL \|
	148	+ (nodir ? DLM_LSFL_NODIR : 0),
148	149	GDLM_LVB_SIZE);
149	150	if (error) {
150	151	log_error("dlm_new_lockspace error %d", error);
...	...	@@ -26,7 +26,7 @@
26	26	/* Version of the device interface */
27	27	#define DLM_DEVICE_VERSION_MAJOR 6
28	28	#define DLM_DEVICE_VERSION_MINOR 0
29		-#define DLM_DEVICE_VERSION_PATCH 0
	29	+#define DLM_DEVICE_VERSION_PATCH 1
30	30
31	31	/* struct passed to the lock write */
32	32	struct dlm_lock_params {