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dlm: move plock code from gfs2

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Move the code that handles cluster posix locks from gfs2 into the dlm
so that it can be used by both gfs2 and ocfs2.

Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
David Teigland 2008-03-14 15:09:15 -05:00
parent d44e0fc704
commit 2402211a83
11 changed files with 186 additions and 131 deletions
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1
fs/dlm/Makefile
View file

@ -10,6 +10,7 @@ dlm-y := ast.o \
midcomms.o \
netlink.o \
lowcomms.o \
plock.o \
rcom.o \
recover.o \
recoverd.o \

2
fs/dlm/dlm_internal.h
View file

@ -582,6 +582,8 @@ static inline int dlm_no_directory(struct dlm_ls *ls)
int dlm_netlink_init(void);
void dlm_netlink_exit(void);
void dlm_timeout_warn(struct dlm_lkb *lkb);
int dlm_plock_init(void);
void dlm_plock_exit(void);
#ifdef CONFIG_DLM_DEBUG
int dlm_register_debugfs(void);

7
fs/dlm/main.c
View file

@ -46,10 +46,16 @@ static int __init init_dlm(void)
if (error)
goto out_user;
error = dlm_plock_init();
if (error)
goto out_netlink;
printk("DLM (built %s %s) installed\n", __DATE__, __TIME__);
return 0;
out_netlink:
dlm_netlink_exit();
out_user:
dlm_user_exit();
out_debug:
@ -66,6 +72,7 @@ static int __init init_dlm(void)
static void __exit exit_dlm(void)
{
dlm_plock_exit();
dlm_netlink_exit();
dlm_user_exit();
dlm_config_exit();

171
fs/gfs2/locking/dlm/plock.c → fs/dlm/plock.c
View file

@ -1,17 +1,19 @@
/*
* Copyright (C) 2005 Red Hat, Inc. All rights reserved.
* Copyright (C) 2005-2008 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
* of the GNU General Public License version 2.
*/
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/lock_dlm_plock.h>
#include <linux/poll.h>
#include <linux/dlm.h>
#include <linux/dlm_plock.h>
#include "lock_dlm.h"
#include "dlm_internal.h"
#include "lockspace.h"
static spinlock_t ops_lock;
static struct list_head send_list;
@ -22,7 +24,7 @@ static wait_queue_head_t recv_wq;
struct plock_op {
struct list_head list;
int done;
struct gdlm_plock_info info;
struct dlm_plock_info info;
};
struct plock_xop {
@ -34,22 +36,22 @@ struct plock_xop {
};
static inline void set_version(struct gdlm_plock_info *info)
static inline void set_version(struct dlm_plock_info *info)
{
info->version[0] = GDLM_PLOCK_VERSION_MAJOR;
info->version[1] = GDLM_PLOCK_VERSION_MINOR;
info->version[2] = GDLM_PLOCK_VERSION_PATCH;
info->version[0] = DLM_PLOCK_VERSION_MAJOR;
info->version[1] = DLM_PLOCK_VERSION_MINOR;
info->version[2] = DLM_PLOCK_VERSION_PATCH;
}
static int check_version(struct gdlm_plock_info *info)
static int check_version(struct dlm_plock_info *info)
{
if ((GDLM_PLOCK_VERSION_MAJOR != info->version[0]) ||
(GDLM_PLOCK_VERSION_MINOR < info->version[1])) {
log_error("plock device version mismatch: "
if ((DLM_PLOCK_VERSION_MAJOR != info->version[0]) ||
(DLM_PLOCK_VERSION_MINOR < info->version[1])) {
log_print("plock device version mismatch: "
"kernel (%u.%u.%u), user (%u.%u.%u)",
GDLM_PLOCK_VERSION_MAJOR,
GDLM_PLOCK_VERSION_MINOR,
GDLM_PLOCK_VERSION_PATCH,
DLM_PLOCK_VERSION_MAJOR,
DLM_PLOCK_VERSION_MINOR,
DLM_PLOCK_VERSION_PATCH,
info->version[0],
info->version[1],
info->version[2]);
@ -68,25 +70,31 @@ static void send_op(struct plock_op *op)
wake_up(&send_wq);
}
int gdlm_plock(void *lockspace, struct lm_lockname *name,
struct file *file, int cmd, struct file_lock *fl)
int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
int cmd, struct file_lock *fl)
{
struct gdlm_ls *ls = lockspace;
struct dlm_ls *ls;
struct plock_op *op;
struct plock_xop *xop;
int rv;
ls = dlm_find_lockspace_local(lockspace);
if (!ls)
return -EINVAL;
xop = kzalloc(sizeof(*xop), GFP_KERNEL);
if (!xop)
return -ENOMEM;
if (!xop) {
rv = -ENOMEM;
goto out;
}
op = &xop->xop;
op->info.optype = GDLM_PLOCK_OP_LOCK;
op->info.optype = DLM_PLOCK_OP_LOCK;
op->info.pid = fl->fl_pid;
op->info.ex = (fl->fl_type == F_WRLCK);
op->info.wait = IS_SETLKW(cmd);
op->info.fsid = ls->id;
op->info.number = name->ln_number;
op->info.fsid = ls->ls_global_id;
op->info.number = number;
op->info.start = fl->fl_start;
op->info.end = fl->fl_end;
if (fl->fl_lmops && fl->fl_lmops->fl_grant) {
@ -107,12 +115,15 @@ int gdlm_plock(void *lockspace, struct lm_lockname *name,
if (xop->callback == NULL)
wait_event(recv_wq, (op->done != 0));
else
return -EINPROGRESS;
else {
rv = -EINPROGRESS;
goto out;
}
spin_lock(&ops_lock);
if (!list_empty(&op->list)) {
printk(KERN_INFO "plock op on list\n");
log_error(ls, "dlm_posix_lock: op on list %llx",
(unsigned long long)number);
list_del(&op->list);
}
spin_unlock(&ops_lock);
@ -121,17 +132,19 @@ int gdlm_plock(void *lockspace, struct lm_lockname *name,
if (!rv) {
if (posix_lock_file_wait(file, fl) < 0)
log_error("gdlm_plock: vfs lock error %x,%llx",
name->ln_type,
(unsigned long long)name->ln_number);
log_error(ls, "dlm_posix_lock: vfs lock error %llx",
(unsigned long long)number);
}
kfree(xop);
out:
dlm_put_lockspace(ls);
return rv;
}
EXPORT_SYMBOL_GPL(dlm_posix_lock);
/* Returns failure iff a succesful lock operation should be canceled */
static int gdlm_plock_callback(struct plock_op *op)
static int dlm_plock_callback(struct plock_op *op)
{
struct file *file;
struct file_lock *fl;
@ -142,7 +155,8 @@ static int gdlm_plock_callback(struct plock_op *op)
spin_lock(&ops_lock);
if (!list_empty(&op->list)) {
printk(KERN_INFO "plock op on list\n");
log_print("dlm_plock_callback: op on list %llx",
(unsigned long long)op->info.number);
list_del(&op->list);
}
spin_unlock(&ops_lock);
@ -165,19 +179,19 @@ static int gdlm_plock_callback(struct plock_op *op)
* This can only happen in the case of kmalloc() failure.
* The filesystem's own lock is the authoritative lock,
* so a failure to get the lock locally is not a disaster.
* As long as GFS cannot reliably cancel locks (especially
* As long as the fs cannot reliably cancel locks (especially
* in a low-memory situation), we're better off ignoring
* this failure than trying to recover.
*/
log_error("gdlm_plock: vfs lock error file %p fl %p",
file, fl);
log_print("dlm_plock_callback: vfs lock error %llx file %p fl %p",
(unsigned long long)op->info.number, file, fl);
}
rv = notify(flc, NULL, 0);
if (rv) {
/* XXX: We need to cancel the fs lock here: */
printk("gfs2 lock granted after lock request failed;"
" dangling lock!\n");
log_print("dlm_plock_callback: lock granted after lock request "
"failed; dangling lock!\n");
goto out;
}
@ -186,25 +200,31 @@ out:
return rv;
}
int gdlm_punlock(void *lockspace, struct lm_lockname *name,
struct file *file, struct file_lock *fl)
int dlm_posix_unlock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
struct file_lock *fl)
{
struct gdlm_ls *ls = lockspace;
struct dlm_ls *ls;
struct plock_op *op;
int rv;
ls = dlm_find_lockspace_local(lockspace);
if (!ls)
return -EINVAL;
op = kzalloc(sizeof(*op), GFP_KERNEL);
if (!op)
return -ENOMEM;
if (!op) {
rv = -ENOMEM;
goto out;
}
if (posix_lock_file_wait(file, fl) < 0)
log_error("gdlm_punlock: vfs unlock error %x,%llx",
name->ln_type, (unsigned long long)name->ln_number);
log_error(ls, "dlm_posix_unlock: vfs unlock error %llx",
(unsigned long long)number);
op->info.optype = GDLM_PLOCK_OP_UNLOCK;
op->info.optype = DLM_PLOCK_OP_UNLOCK;
op->info.pid = fl->fl_pid;
op->info.fsid = ls->id;
op->info.number = name->ln_number;
op->info.fsid = ls->ls_global_id;
op->info.number = number;
op->info.start = fl->fl_start;
op->info.end = fl->fl_end;
if (fl->fl_lmops && fl->fl_lmops->fl_grant)
@ -217,7 +237,8 @@ int gdlm_punlock(void *lockspace, struct lm_lockname *name,
spin_lock(&ops_lock);
if (!list_empty(&op->list)) {
printk(KERN_INFO "punlock op on list\n");
log_error(ls, "dlm_posix_unlock: op on list %llx",
(unsigned long long)number);
list_del(&op->list);
}
spin_unlock(&ops_lock);
@ -228,25 +249,34 @@ int gdlm_punlock(void *lockspace, struct lm_lockname *name,
rv = 0;
kfree(op);
out:
dlm_put_lockspace(ls);
return rv;
}
EXPORT_SYMBOL_GPL(dlm_posix_unlock);
int gdlm_plock_get(void *lockspace, struct lm_lockname *name,
struct file *file, struct file_lock *fl)
int dlm_posix_get(dlm_lockspace_t *lockspace, u64 number, struct file *file,
struct file_lock *fl)
{
struct gdlm_ls *ls = lockspace;
struct dlm_ls *ls;
struct plock_op *op;
int rv;
op = kzalloc(sizeof(*op), GFP_KERNEL);
if (!op)
return -ENOMEM;
ls = dlm_find_lockspace_local(lockspace);
if (!ls)
return -EINVAL;
op->info.optype = GDLM_PLOCK_OP_GET;
op = kzalloc(sizeof(*op), GFP_KERNEL);
if (!op) {
rv = -ENOMEM;
goto out;
}
op->info.optype = DLM_PLOCK_OP_GET;
op->info.pid = fl->fl_pid;
op->info.ex = (fl->fl_type == F_WRLCK);
op->info.fsid = ls->id;
op->info.number = name->ln_number;
op->info.fsid = ls->ls_global_id;
op->info.number = number;
op->info.start = fl->fl_start;
op->info.end = fl->fl_end;
if (fl->fl_lmops && fl->fl_lmops->fl_grant)
@ -259,7 +289,8 @@ int gdlm_plock_get(void *lockspace, struct lm_lockname *name,
spin_lock(&ops_lock);
if (!list_empty(&op->list)) {
printk(KERN_INFO "plock_get op on list\n");
log_error(ls, "dlm_posix_get: op on list %llx",
(unsigned long long)number);
list_del(&op->list);
}
spin_unlock(&ops_lock);
@ -281,14 +312,17 @@ int gdlm_plock_get(void *lockspace, struct lm_lockname *name,
}
kfree(op);
out:
dlm_put_lockspace(ls);
return rv;
}
EXPORT_SYMBOL_GPL(dlm_posix_get);
/* a read copies out one plock request from the send list */
static ssize_t dev_read(struct file *file, char __user *u, size_t count,
loff_t *ppos)
{
struct gdlm_plock_info info;
struct dlm_plock_info info;
struct plock_op *op = NULL;
if (count < sizeof(info))
@ -315,7 +349,7 @@ static ssize_t dev_read(struct file *file, char __user *u, size_t count,
static ssize_t dev_write(struct file *file, const char __user *u, size_t count,
loff_t *ppos)
{
struct gdlm_plock_info info;
struct dlm_plock_info info;
struct plock_op *op;
int found = 0;
@ -345,12 +379,12 @@ static ssize_t dev_write(struct file *file, const char __user *u, size_t count,
struct plock_xop *xop;
xop = (struct plock_xop *)op;
if (xop->callback)
count = gdlm_plock_callback(op);
count = dlm_plock_callback(op);
else
wake_up(&recv_wq);
} else
printk(KERN_INFO "gdlm dev_write no op %x %llx\n", info.fsid,
(unsigned long long)info.number);
log_print("dev_write no op %x %llx", info.fsid,
(unsigned long long)info.number);
return count;
}
@ -377,11 +411,11 @@ static const struct file_operations dev_fops = {
static struct miscdevice plock_dev_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = GDLM_PLOCK_MISC_NAME,
.name = DLM_PLOCK_MISC_NAME,
.fops = &dev_fops
};
int gdlm_plock_init(void)
int dlm_plock_init(void)
{
int rv;
@ -393,14 +427,13 @@ int gdlm_plock_init(void)
rv = misc_register(&plock_dev_misc);
if (rv)
printk(KERN_INFO "gdlm_plock_init: misc_register failed %d",
rv);
log_print("dlm_plock_init: misc_register failed %d", rv);
return rv;
}
void gdlm_plock_exit(void)
void dlm_plock_exit(void)
{
if (misc_deregister(&plock_dev_misc) < 0)
printk(KERN_INFO "gdlm_plock_exit: misc_deregister failed");
log_print("dlm_plock_exit: misc_deregister failed");
}

2
fs/gfs2/locking/dlm/Makefile
View file

@ -1,3 +1,3 @@
obj-$(CONFIG_GFS2_FS_LOCKING_DLM) += lock_dlm.o
lock_dlm-y := lock.o main.o mount.o sysfs.o thread.o plock.o
lock_dlm-y := lock.o main.o mount.o sysfs.o thread.o

12
fs/gfs2/locking/dlm/lock_dlm.h
View file

@ -25,6 +25,7 @@
#include <net/sock.h>
#include <linux/dlm.h>
#include <linux/dlm_plock.h>
#include <linux/lm_interface.h>
/*
@ -173,17 +174,6 @@ void gdlm_cancel(void *);
int gdlm_hold_lvb(void *, char **);
void gdlm_unhold_lvb(void *, char *);
/* plock.c */
int gdlm_plock_init(void);
void gdlm_plock_exit(void);
int gdlm_plock(void *, struct lm_lockname *, struct file *, int,
struct file_lock *);
int gdlm_plock_get(void *, struct lm_lockname *, struct file *,
struct file_lock *);
int gdlm_punlock(void *, struct lm_lockname *, struct file *,
struct file_lock *);
/* mount.c */
extern const struct lm_lockops gdlm_ops;

8
fs/gfs2/locking/dlm/main.c
View file

@ -28,13 +28,6 @@ static int __init init_lock_dlm(void)
return error;
}
error = gdlm_plock_init();
if (error) {
gdlm_sysfs_exit();
gfs2_unregister_lockproto(&gdlm_ops);
return error;
}
printk(KERN_INFO
"Lock_DLM (built %s %s) installed\n", __DATE__, __TIME__);
return 0;
@ -42,7 +35,6 @@ static int __init init_lock_dlm(void)
static void __exit exit_lock_dlm(void)
{
gdlm_plock_exit();
gdlm_sysfs_exit();
gfs2_unregister_lockproto(&gdlm_ops);
}

21
fs/gfs2/locking/dlm/mount.c
View file

@ -236,6 +236,27 @@ static void gdlm_withdraw(void *lockspace)
gdlm_kobject_release(ls);
}
static int gdlm_plock(void *lockspace, struct lm_lockname *name,
struct file *file, int cmd, struct file_lock *fl)
{
struct gdlm_ls *ls = lockspace;
return dlm_posix_lock(ls->dlm_lockspace, name->ln_number, file, cmd, fl);
}
static int gdlm_punlock(void *lockspace, struct lm_lockname *name,
struct file *file, struct file_lock *fl)
{
struct gdlm_ls *ls = lockspace;
return dlm_posix_unlock(ls->dlm_lockspace, name->ln_number, file, fl);
}
static int gdlm_plock_get(void *lockspace, struct lm_lockname *name,
struct file *file, struct file_lock *fl)
{
struct gdlm_ls *ls = lockspace;
return dlm_posix_get(ls->dlm_lockspace, name->ln_number, file, fl);
}
const struct lm_lockops gdlm_ops = {
.lm_proto_name = "lock_dlm",
.lm_mount = gdlm_mount,

2
include/linux/Kbuild
View file

@ -100,7 +100,7 @@ header-y += ixjuser.h
header-y += jffs2.h
header-y += keyctl.h
header-y += limits.h
header-y += lock_dlm_plock.h
header-y += dlm_plock.h
header-y += magic.h
header-y += major.h
header-y += matroxfb.h

50
include/linux/dlm_plock.h Normal file
View file

@ -0,0 +1,50 @@
/*
* Copyright (C) 2005-2008 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
* of the GNU General Public License v.2.
*/
#ifndef __DLM_PLOCK_DOT_H__
#define __DLM_PLOCK_DOT_H__
#define DLM_PLOCK_MISC_NAME "dlm_plock"
#define DLM_PLOCK_VERSION_MAJOR 1
#define DLM_PLOCK_VERSION_MINOR 1
#define DLM_PLOCK_VERSION_PATCH 0
enum {
DLM_PLOCK_OP_LOCK = 1,
DLM_PLOCK_OP_UNLOCK,
DLM_PLOCK_OP_GET,
};
struct dlm_plock_info {
__u32 version[3];
__u8 optype;
__u8 ex;
__u8 wait;
__u8 pad;
__u32 pid;
__s32 nodeid;
__s32 rv;
__u32 fsid;
__u64 number;
__u64 start;
__u64 end;
__u64 owner;
};
#ifdef __KERNEL__
int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
int cmd, struct file_lock *fl);
int dlm_posix_unlock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
struct file_lock *fl);
int dlm_posix_get(dlm_lockspace_t *lockspace, u64 number, struct file *file,
struct file_lock *fl);
#endif /* __KERNEL__ */
#endif

41
include/linux/lock_dlm_plock.h
View file

@ -1,41 +0,0 @@
/*
* Copyright (C) 2005 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
* of the GNU General Public License v.2.
*/
#ifndef __LOCK_DLM_PLOCK_DOT_H__
#define __LOCK_DLM_PLOCK_DOT_H__
#define GDLM_PLOCK_MISC_NAME "lock_dlm_plock"
#define GDLM_PLOCK_VERSION_MAJOR 1
#define GDLM_PLOCK_VERSION_MINOR 1
#define GDLM_PLOCK_VERSION_PATCH 0
enum {
GDLM_PLOCK_OP_LOCK = 1,
GDLM_PLOCK_OP_UNLOCK,
GDLM_PLOCK_OP_GET,
};
struct gdlm_plock_info {
__u32 version[3];
__u8 optype;
__u8 ex;
__u8 wait;
__u8 pad;
__u32 pid;
__s32 nodeid;
__s32 rv;
__u32 fsid;
__u64 number;
__u64 start;
__u64 end;
__u64 owner;
};
#endif