[PATCH 5/6] dlm: move plock code from gfs2

From: David Teigland
Date: Fri Apr 18 2008 - 14:19:03 EST

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@xxxxxxxxxx>
---
fs/dlm/Makefile | 1 +
fs/dlm/dlm_internal.h | 2 +
fs/dlm/main.c | 7 +
fs/dlm/plock.c | 439 ++++++++++++++++++++++++++++++++++++++++
fs/gfs2/locking/dlm/Makefile | 2 +-
fs/gfs2/locking/dlm/lock_dlm.h | 11 +-
fs/gfs2/locking/dlm/main.c | 8 -
fs/gfs2/locking/dlm/mount.c | 21 ++
fs/gfs2/locking/dlm/plock.c | 406 -------------------------------------
include/linux/Kbuild | 2 +-
include/linux/dlm_plock.h | 50 +++++
include/linux/lock_dlm_plock.h | 41 ----
12 files changed, 523 insertions(+), 467 deletions(-)
create mode 100644 fs/dlm/plock.c
delete mode 100644 fs/gfs2/locking/dlm/plock.c
create mode 100644 include/linux/dlm_plock.h
delete mode 100644 include/linux/lock_dlm_plock.h

diff --git a/fs/dlm/Makefile b/fs/dlm/Makefile
index d248e60..ca1c912 100644
--- a/fs/dlm/Makefile
+++ b/fs/dlm/Makefile
@@ -10,6 +10,7 @@ dlm-y := ast.o \
midcomms.o \
netlink.o \
lowcomms.o \
+ plock.o \
rcom.o \
recover.o \
recoverd.o \
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index c70c8e5..caa1581 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -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);
diff --git a/fs/dlm/main.c b/fs/dlm/main.c
index 58487fb..b80e0aa 100644
--- a/fs/dlm/main.c
+++ b/fs/dlm/main.c
@@ -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();
diff --git a/fs/dlm/plock.c b/fs/dlm/plock.c
new file mode 100644
index 0000000..d6d6e37
--- /dev/null
+++ b/fs/dlm/plock.c
@@ -0,0 +1,439 @@
+/*
+ * 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/poll.h>
+#include <linux/dlm.h>
+#include <linux/dlm_plock.h>
+
+#include "dlm_internal.h"
+#include "lockspace.h"
+
+static spinlock_t ops_lock;
+static struct list_head send_list;
+static struct list_head recv_list;
+static wait_queue_head_t send_wq;
+static wait_queue_head_t recv_wq;
+
+struct plock_op {
+ struct list_head list;
+ int done;
+ struct dlm_plock_info info;
+};
+
+struct plock_xop {
+ struct plock_op xop;
+ void *callback;
+ void *fl;
+ void *file;
+ struct file_lock flc;
+};
+
+
+static inline void set_version(struct dlm_plock_info *info)
+{
+ 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 dlm_plock_info *info)
+{
+ 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)",
+ DLM_PLOCK_VERSION_MAJOR,
+ DLM_PLOCK_VERSION_MINOR,
+ DLM_PLOCK_VERSION_PATCH,
+ info->version[0],
+ info->version[1],
+ info->version[2]);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static void send_op(struct plock_op *op)
+{
+ set_version(&op->info);
+ INIT_LIST_HEAD(&op->list);
+ spin_lock(&ops_lock);
+ list_add_tail(&op->list, &send_list);
+ spin_unlock(&ops_lock);
+ wake_up(&send_wq);
+}
+
+int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
+ int cmd, struct file_lock *fl)
+{
+ 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) {
+ rv = -ENOMEM;
+ goto out;
+ }
+
+ op = &xop->xop;
+ 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->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) {
+ /* fl_owner is lockd which doesn't distinguish
+ processes on the nfs client */
+ op->info.owner = (__u64) fl->fl_pid;
+ xop->callback = fl->fl_lmops->fl_grant;
+ locks_init_lock(&xop->flc);
+ locks_copy_lock(&xop->flc, fl);
+ xop->fl = fl;
+ xop->file = file;
+ } else {
+ op->info.owner = (__u64)(long) fl->fl_owner;
+ xop->callback = NULL;
+ }
+
+ send_op(op);
+
+ if (xop->callback == NULL)
+ wait_event(recv_wq, (op->done != 0));
+ else {
+ rv = -EINPROGRESS;
+ goto out;
+ }
+
+ spin_lock(&ops_lock);
+ if (!list_empty(&op->list)) {
+ log_error(ls, "dlm_posix_lock: op on list %llx",
+ (unsigned long long)number);
+ list_del(&op->list);
+ }
+ spin_unlock(&ops_lock);
+
+ rv = op->info.rv;
+
+ if (!rv) {
+ if (posix_lock_file_wait(file, fl) < 0)
+ 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 dlm_plock_callback(struct plock_op *op)
+{
+ struct file *file;
+ struct file_lock *fl;
+ struct file_lock *flc;
+ int (*notify)(void *, void *, int) = NULL;
+ struct plock_xop *xop = (struct plock_xop *)op;
+ int rv = 0;
+
+ spin_lock(&ops_lock);
+ if (!list_empty(&op->list)) {
+ log_print("dlm_plock_callback: op on list %llx",
+ (unsigned long long)op->info.number);
+ list_del(&op->list);
+ }
+ spin_unlock(&ops_lock);
+
+ /* check if the following 2 are still valid or make a copy */
+ file = xop->file;
+ flc = &xop->flc;
+ fl = xop->fl;
+ notify = xop->callback;
+
+ if (op->info.rv) {
+ notify(flc, NULL, op->info.rv);
+ goto out;
+ }
+
+ /* got fs lock; bookkeep locally as well: */
+ flc->fl_flags &= ~FL_SLEEP;
+ if (posix_lock_file(file, flc, NULL)) {
+ /*
+ * 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 the fs cannot reliably cancel locks (especially
+ * in a low-memory situation), we're better off ignoring
+ * this failure than trying to recover.
+ */
+ 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: */
+ log_print("dlm_plock_callback: lock granted after lock request "
+ "failed; dangling lock!\n");
+ goto out;
+ }
+
+out:
+ kfree(xop);
+ return rv;
+}
+
+int dlm_posix_unlock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
+ struct file_lock *fl)
+{
+ 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) {
+ rv = -ENOMEM;
+ goto out;
+ }
+
+ if (posix_lock_file_wait(file, fl) < 0)
+ log_error(ls, "dlm_posix_unlock: vfs unlock error %llx",
+ (unsigned long long)number);
+
+ op->info.optype = DLM_PLOCK_OP_UNLOCK;
+ op->info.pid = fl->fl_pid;
+ 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)
+ op->info.owner = (__u64) fl->fl_pid;
+ else
+ op->info.owner = (__u64)(long) fl->fl_owner;
+
+ send_op(op);
+ wait_event(recv_wq, (op->done != 0));
+
+ spin_lock(&ops_lock);
+ if (!list_empty(&op->list)) {
+ log_error(ls, "dlm_posix_unlock: op on list %llx",
+ (unsigned long long)number);
+ list_del(&op->list);
+ }
+ spin_unlock(&ops_lock);
+
+ rv = op->info.rv;
+
+ if (rv == -ENOENT)
+ rv = 0;
+
+ kfree(op);
+out:
+ dlm_put_lockspace(ls);
+ return rv;
+}
+EXPORT_SYMBOL_GPL(dlm_posix_unlock);
+
+int dlm_posix_get(dlm_lockspace_t *lockspace, u64 number, struct file *file,
+ struct file_lock *fl)
+{
+ 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) {
+ 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->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)
+ op->info.owner = (__u64) fl->fl_pid;
+ else
+ op->info.owner = (__u64)(long) fl->fl_owner;
+
+ send_op(op);
+ wait_event(recv_wq, (op->done != 0));
+
+ spin_lock(&ops_lock);
+ if (!list_empty(&op->list)) {
+ log_error(ls, "dlm_posix_get: op on list %llx",
+ (unsigned long long)number);
+ list_del(&op->list);
+ }
+ spin_unlock(&ops_lock);
+
+ /* info.rv from userspace is 1 for conflict, 0 for no-conflict,
+ -ENOENT if there are no locks on the file */
+
+ rv = op->info.rv;
+
+ fl->fl_type = F_UNLCK;
+ if (rv == -ENOENT)
+ rv = 0;
+ else if (rv > 0) {
+ fl->fl_type = (op->info.ex) ? F_WRLCK : F_RDLCK;
+ fl->fl_pid = op->info.pid;
+ fl->fl_start = op->info.start;
+ fl->fl_end = op->info.end;
+ rv = 0;
+ }
+
+ 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 dlm_plock_info info;
+ struct plock_op *op = NULL;
+
+ if (count < sizeof(info))
+ return -EINVAL;
+
+ spin_lock(&ops_lock);
+ if (!list_empty(&send_list)) {
+ op = list_entry(send_list.next, struct plock_op, list);
+ list_move(&op->list, &recv_list);
+ memcpy(&info, &op->info, sizeof(info));
+ }
+ spin_unlock(&ops_lock);
+
+ if (!op)
+ return -EAGAIN;
+
+ if (copy_to_user(u, &info, sizeof(info)))
+ return -EFAULT;
+ return sizeof(info);
+}
+
+/* a write copies in one plock result that should match a plock_op
+ on the recv list */
+static ssize_t dev_write(struct file *file, const char __user *u, size_t count,
+ loff_t *ppos)
+{
+ struct dlm_plock_info info;
+ struct plock_op *op;
+ int found = 0;
+
+ if (count != sizeof(info))
+ return -EINVAL;
+
+ if (copy_from_user(&info, u, sizeof(info)))
+ return -EFAULT;
+
+ if (check_version(&info))
+ return -EINVAL;
+
+ spin_lock(&ops_lock);
+ list_for_each_entry(op, &recv_list, list) {
+ if (op->info.fsid == info.fsid && op->info.number == info.number &&
+ op->info.owner == info.owner) {
+ list_del_init(&op->list);
+ found = 1;
+ op->done = 1;
+ memcpy(&op->info, &info, sizeof(info));
+ break;
+ }
+ }
+ spin_unlock(&ops_lock);
+
+ if (found) {
+ struct plock_xop *xop;
+ xop = (struct plock_xop *)op;
+ if (xop->callback)
+ count = dlm_plock_callback(op);
+ else
+ wake_up(&recv_wq);
+ } else
+ log_print("dev_write no op %x %llx", info.fsid,
+ (unsigned long long)info.number);
+ return count;
+}
+
+static unsigned int dev_poll(struct file *file, poll_table *wait)
+{
+ unsigned int mask = 0;
+
+ poll_wait(file, &send_wq, wait);
+
+ spin_lock(&ops_lock);
+ if (!list_empty(&send_list))
+ mask = POLLIN | POLLRDNORM;
+ spin_unlock(&ops_lock);
+
+ return mask;
+}
+
+static const struct file_operations dev_fops = {
+ .read = dev_read,
+ .write = dev_write,
+ .poll = dev_poll,
+ .owner = THIS_MODULE
+};
+
+static struct miscdevice plock_dev_misc = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = DLM_PLOCK_MISC_NAME,
+ .fops = &dev_fops
+};
+
+int dlm_plock_init(void)
+{
+ int rv;
+
+ spin_lock_init(&ops_lock);
+ INIT_LIST_HEAD(&send_list);
+ INIT_LIST_HEAD(&recv_list);
+ init_waitqueue_head(&send_wq);
+ init_waitqueue_head(&recv_wq);
+
+ rv = misc_register(&plock_dev_misc);
+ if (rv)
+ log_print("dlm_plock_init: misc_register failed %d", rv);
+ return rv;
+}
+
+void dlm_plock_exit(void)
+{
+ if (misc_deregister(&plock_dev_misc) < 0)
+ log_print("dlm_plock_exit: misc_deregister failed");
+}
+
diff --git a/fs/gfs2/locking/dlm/Makefile b/fs/gfs2/locking/dlm/Makefile
index 89b93b6..2609bb6 100644
--- a/fs/gfs2/locking/dlm/Makefile
+++ b/fs/gfs2/locking/dlm/Makefile
@@ -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

diff --git a/fs/gfs2/locking/dlm/lock_dlm.h b/fs/gfs2/locking/dlm/lock_dlm.h
index 9e8265d..55e92af 100644
--- a/fs/gfs2/locking/dlm/lock_dlm.h
+++ b/fs/gfs2/locking/dlm/lock_dlm.h
@@ -25,6 +25,7 @@
#include <net/sock.h>

#include <linux/dlm.h>
+#include <linux/dlm_plock.h>
#include <linux/lm_interface.h>

/*
@@ -173,15 +174,5 @@ 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 *);
#endif

diff --git a/fs/gfs2/locking/dlm/main.c b/fs/gfs2/locking/dlm/main.c
index a0e7eda..867763c 100644
--- a/fs/gfs2/locking/dlm/main.c
+++ b/fs/gfs2/locking/dlm/main.c
@@ -30,13 +30,6 @@ 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;
@@ -44,7 +37,6 @@ 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);
}
diff --git a/fs/gfs2/locking/dlm/mount.c b/fs/gfs2/locking/dlm/mount.c
index f2efff4..470bdf6 100644
--- a/fs/gfs2/locking/dlm/mount.c
+++ b/fs/gfs2/locking/dlm/mount.c
@@ -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,
diff --git a/fs/gfs2/locking/dlm/plock.c b/fs/gfs2/locking/dlm/plock.c
deleted file mode 100644
index 2ebd374..0000000
--- a/fs/gfs2/locking/dlm/plock.c
+++ /dev/null
@@ -1,406 +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 version 2.
- */
-
-#include <linux/miscdevice.h>
-#include <linux/lock_dlm_plock.h>
-#include <linux/poll.h>
-
-#include "lock_dlm.h"
-
-
-static spinlock_t ops_lock;
-static struct list_head send_list;
-static struct list_head recv_list;
-static wait_queue_head_t send_wq;
-static wait_queue_head_t recv_wq;
-
-struct plock_op {
- struct list_head list;
- int done;
- struct gdlm_plock_info info;
-};
-
-struct plock_xop {
- struct plock_op xop;
- void *callback;
- void *fl;
- void *file;
- struct file_lock flc;
-};
-
-
-static inline void set_version(struct gdlm_plock_info *info)
-{
- info->version[0] = GDLM_PLOCK_VERSION_MAJOR;
- info->version[1] = GDLM_PLOCK_VERSION_MINOR;
- info->version[2] = GDLM_PLOCK_VERSION_PATCH;
-}
-
-static int check_version(struct gdlm_plock_info *info)
-{
- if ((GDLM_PLOCK_VERSION_MAJOR != info->version[0]) ||
- (GDLM_PLOCK_VERSION_MINOR < info->version[1])) {
- log_error("plock device version mismatch: "
- "kernel (%u.%u.%u), user (%u.%u.%u)",
- GDLM_PLOCK_VERSION_MAJOR,
- GDLM_PLOCK_VERSION_MINOR,
- GDLM_PLOCK_VERSION_PATCH,
- info->version[0],
- info->version[1],
- info->version[2]);
- return -EINVAL;
- }
- return 0;
-}
-
-static void send_op(struct plock_op *op)
-{
- set_version(&op->info);
- INIT_LIST_HEAD(&op->list);
- spin_lock(&ops_lock);
- list_add_tail(&op->list, &send_list);
- spin_unlock(&ops_lock);
- wake_up(&send_wq);
-}
-
-int gdlm_plock(void *lockspace, struct lm_lockname *name,
- struct file *file, int cmd, struct file_lock *fl)
-{
- struct gdlm_ls *ls = lockspace;
- struct plock_op *op;
- struct plock_xop *xop;
- int rv;
-
- xop = kzalloc(sizeof(*xop), GFP_KERNEL);
- if (!xop)
- return -ENOMEM;
-
- op = &xop->xop;
- op->info.optype = GDLM_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.start = fl->fl_start;
- op->info.end = fl->fl_end;
- if (fl->fl_lmops && fl->fl_lmops->fl_grant) {
- /* fl_owner is lockd which doesn't distinguish
- processes on the nfs client */
- op->info.owner = (__u64) fl->fl_pid;
- xop->callback = fl->fl_lmops->fl_grant;
- locks_init_lock(&xop->flc);
- locks_copy_lock(&xop->flc, fl);
- xop->fl = fl;
- xop->file = file;
- } else {
- op->info.owner = (__u64)(long) fl->fl_owner;
- xop->callback = NULL;
- }
-
- send_op(op);
-
- if (xop->callback == NULL)
- wait_event(recv_wq, (op->done != 0));
- else
- return -EINPROGRESS;
-
- spin_lock(&ops_lock);
- if (!list_empty(&op->list)) {
- printk(KERN_INFO "plock op on list\n");
- list_del(&op->list);
- }
- spin_unlock(&ops_lock);
-
- rv = op->info.rv;
-
- 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);
- }
-
- kfree(xop);
- return rv;
-}
-
-/* Returns failure iff a succesful lock operation should be canceled */
-static int gdlm_plock_callback(struct plock_op *op)
-{
- struct file *file;
- struct file_lock *fl;
- struct file_lock *flc;
- int (*notify)(void *, void *, int) = NULL;
- struct plock_xop *xop = (struct plock_xop *)op;
- int rv = 0;
-
- spin_lock(&ops_lock);
- if (!list_empty(&op->list)) {
- printk(KERN_INFO "plock op on list\n");
- list_del(&op->list);
- }
- spin_unlock(&ops_lock);
-
- /* check if the following 2 are still valid or make a copy */
- file = xop->file;
- flc = &xop->flc;
- fl = xop->fl;
- notify = xop->callback;
-
- if (op->info.rv) {
- notify(flc, NULL, op->info.rv);
- goto out;
- }
-
- /* got fs lock; bookkeep locally as well: */
- flc->fl_flags &= ~FL_SLEEP;
- if (posix_lock_file(file, flc, NULL)) {
- /*
- * 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
- * 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);
- }
-
- 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");
- goto out;
- }
-
-out:
- kfree(xop);
- return rv;
-}
-
-int gdlm_punlock(void *lockspace, struct lm_lockname *name,
- struct file *file, struct file_lock *fl)
-{
- struct gdlm_ls *ls = lockspace;
- struct plock_op *op;
- int rv;
-
- op = kzalloc(sizeof(*op), GFP_KERNEL);
- if (!op)
- return -ENOMEM;
-
- 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);
-
- op->info.optype = GDLM_PLOCK_OP_UNLOCK;
- op->info.pid = fl->fl_pid;
- op->info.fsid = ls->id;
- op->info.number = name->ln_number;
- op->info.start = fl->fl_start;
- op->info.end = fl->fl_end;
- if (fl->fl_lmops && fl->fl_lmops->fl_grant)
- op->info.owner = (__u64) fl->fl_pid;
- else
- op->info.owner = (__u64)(long) fl->fl_owner;
-
- send_op(op);
- wait_event(recv_wq, (op->done != 0));
-
- spin_lock(&ops_lock);
- if (!list_empty(&op->list)) {
- printk(KERN_INFO "punlock op on list\n");
- list_del(&op->list);
- }
- spin_unlock(&ops_lock);
-
- rv = op->info.rv;
-
- if (rv == -ENOENT)
- rv = 0;
-
- kfree(op);
- return rv;
-}
-
-int gdlm_plock_get(void *lockspace, struct lm_lockname *name,
- struct file *file, struct file_lock *fl)
-{
- struct gdlm_ls *ls = lockspace;
- struct plock_op *op;
- int rv;
-
- op = kzalloc(sizeof(*op), GFP_KERNEL);
- if (!op)
- return -ENOMEM;
-
- op->info.optype = GDLM_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.start = fl->fl_start;
- op->info.end = fl->fl_end;
- if (fl->fl_lmops && fl->fl_lmops->fl_grant)
- op->info.owner = (__u64) fl->fl_pid;
- else
- op->info.owner = (__u64)(long) fl->fl_owner;
-
- send_op(op);
- wait_event(recv_wq, (op->done != 0));
-
- spin_lock(&ops_lock);
- if (!list_empty(&op->list)) {
- printk(KERN_INFO "plock_get op on list\n");
- list_del(&op->list);
- }
- spin_unlock(&ops_lock);
-
- /* info.rv from userspace is 1 for conflict, 0 for no-conflict,
- -ENOENT if there are no locks on the file */
-
- rv = op->info.rv;
-
- fl->fl_type = F_UNLCK;
- if (rv == -ENOENT)
- rv = 0;
- else if (rv > 0) {
- fl->fl_type = (op->info.ex) ? F_WRLCK : F_RDLCK;
- fl->fl_pid = op->info.pid;
- fl->fl_start = op->info.start;
- fl->fl_end = op->info.end;
- rv = 0;
- }
-
- kfree(op);
- return rv;
-}
-
-/* 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 plock_op *op = NULL;
-
- if (count < sizeof(info))
- return -EINVAL;
-
- spin_lock(&ops_lock);
- if (!list_empty(&send_list)) {
- op = list_entry(send_list.next, struct plock_op, list);
- list_move(&op->list, &recv_list);
- memcpy(&info, &op->info, sizeof(info));
- }
- spin_unlock(&ops_lock);
-
- if (!op)
- return -EAGAIN;
-
- if (copy_to_user(u, &info, sizeof(info)))
- return -EFAULT;
- return sizeof(info);
-}
-
-/* a write copies in one plock result that should match a plock_op
- on the recv list */
-static ssize_t dev_write(struct file *file, const char __user *u, size_t count,
- loff_t *ppos)
-{
- struct gdlm_plock_info info;
- struct plock_op *op;
- int found = 0;
-
- if (count != sizeof(info))
- return -EINVAL;
-
- if (copy_from_user(&info, u, sizeof(info)))
- return -EFAULT;
-
- if (check_version(&info))
- return -EINVAL;
-
- spin_lock(&ops_lock);
- list_for_each_entry(op, &recv_list, list) {
- if (op->info.fsid == info.fsid && op->info.number == info.number &&
- op->info.owner == info.owner) {
- list_del_init(&op->list);
- found = 1;
- op->done = 1;
- memcpy(&op->info, &info, sizeof(info));
- break;
- }
- }
- spin_unlock(&ops_lock);
-
- if (found) {
- struct plock_xop *xop;
- xop = (struct plock_xop *)op;
- if (xop->callback)
- count = gdlm_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);
- return count;
-}
-
-static unsigned int dev_poll(struct file *file, poll_table *wait)
-{
- unsigned int mask = 0;
-
- poll_wait(file, &send_wq, wait);
-
- spin_lock(&ops_lock);
- if (!list_empty(&send_list))
- mask = POLLIN | POLLRDNORM;
- spin_unlock(&ops_lock);
-
- return mask;
-}
-
-static const struct file_operations dev_fops = {
- .read = dev_read,
- .write = dev_write,
- .poll = dev_poll,
- .owner = THIS_MODULE
-};
-
-static struct miscdevice plock_dev_misc = {
- .minor = MISC_DYNAMIC_MINOR,
- .name = GDLM_PLOCK_MISC_NAME,
- .fops = &dev_fops
-};
-
-int gdlm_plock_init(void)
-{
- int rv;
-
- spin_lock_init(&ops_lock);
- INIT_LIST_HEAD(&send_list);
- INIT_LIST_HEAD(&recv_list);
- init_waitqueue_head(&send_wq);
- init_waitqueue_head(&recv_wq);
-
- rv = misc_register(&plock_dev_misc);
- if (rv)
- printk(KERN_INFO "gdlm_plock_init: misc_register failed %d",
- rv);
- return rv;
-}
-
-void gdlm_plock_exit(void)
-{
- if (misc_deregister(&plock_dev_misc) < 0)
- printk(KERN_INFO "gdlm_plock_exit: misc_deregister failed");
-}
-
diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index 9cdd12a..7fd04ba 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -99,7 +99,7 @@ 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
diff --git a/include/linux/dlm_plock.h b/include/linux/dlm_plock.h
new file mode 100644
index 0000000..18d5fdb
--- /dev/null
+++ b/include/linux/dlm_plock.h
@@ -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
+
diff --git a/include/linux/lock_dlm_plock.h b/include/linux/lock_dlm_plock.h
deleted file mode 100644
index fc34151..0000000
--- a/include/linux/lock_dlm_plock.h
+++ /dev/null
@@ -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
-
--
1.5.3.3

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