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Subject[PATCH 5/6] dlm: move plock code from gfs2
Date
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>
---
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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