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Diffstat (limited to 'fs/gfs2/locking/dlm/plock.c')
-rw-r--r--fs/gfs2/locking/dlm/plock.c302
1 files changed, 0 insertions, 302 deletions
diff --git a/fs/gfs2/locking/dlm/plock.c b/fs/gfs2/locking/dlm/plock.c
deleted file mode 100644
index 1dd4215b83d..00000000000
--- a/fs/gfs2/locking/dlm/plock.c
+++ /dev/null
@@ -1,302 +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;
-};
-
-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;
- int rv;
-
- op = kzalloc(sizeof(*op), GFP_KERNEL);
- if (!op)
- return -ENOMEM;
-
- 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;
- 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 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(op);
- 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;
- 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;
-
- 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;
-
- 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);
-
- rv = op->info.rv;
-
- if (rv == 0)
- fl->fl_type = F_UNLCK;
- 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;
- }
-
- 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)
- 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)
-{
- poll_wait(file, &send_wq, wait);
-
- spin_lock(&ops_lock);
- if (!list_empty(&send_list)) {
- spin_unlock(&ops_lock);
- return POLLIN | POLLRDNORM;
- }
- spin_unlock(&ops_lock);
- return 0;
-}
-
-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");
-}
-
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-14 14:27:59 +0000