Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-23 20:51:44 +00:00
Code Issues Packages Projects Releases Wiki Activity

[GFS2] The lock modules for GFS2

Browse Source 
This patch contains the pluggable locking modules
for GFS2.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
David Teigland 2006-01-16 16:52:38 +00:00 committed by Steven Whitehouse
parent b3b94faa5f
commit 29b7998d88
9 changed files with 1916 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/gfs2/locking/dlm/Makefile Normal file
View File

@ -0,0 +1,3 @@
obj-$(CONFIG_GFS2_FS) += lock_dlm.o
lock_dlm-y := lock.o main.o mount.o sysfs.o thread.o

537
fs/gfs2/locking/dlm/lock.c Normal file
View File

@ -0,0 +1,537 @@
/******************************************************************************
*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
** Copyright (C) 2004-2005 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.
**
*******************************************************************************
******************************************************************************/
#include "lock_dlm.h"
static char junk_lvb[GDLM_LVB_SIZE];
static void queue_complete(struct gdlm_lock *lp)
{
struct gdlm_ls *ls = lp->ls;
clear_bit(LFL_ACTIVE, &lp->flags);
spin_lock(&ls->async_lock);
list_add_tail(&lp->clist, &ls->complete);
spin_unlock(&ls->async_lock);
wake_up(&ls->thread_wait);
}
static inline void gdlm_ast(void *astarg)
{
queue_complete((struct gdlm_lock *) astarg);
}
static inline void gdlm_bast(void *astarg, int mode)
{
struct gdlm_lock *lp = astarg;
struct gdlm_ls *ls = lp->ls;
if (!mode) {
printk("lock_dlm: bast mode zero %x,%"PRIx64"\n",
lp->lockname.ln_type, lp->lockname.ln_number);
return;
}
spin_lock(&ls->async_lock);
if (!lp->bast_mode) {
list_add_tail(&lp->blist, &ls->blocking);
lp->bast_mode = mode;
} else if (lp->bast_mode < mode)
lp->bast_mode = mode;
spin_unlock(&ls->async_lock);
wake_up(&ls->thread_wait);
}
void gdlm_queue_delayed(struct gdlm_lock *lp)
{
struct gdlm_ls *ls = lp->ls;
spin_lock(&ls->async_lock);
list_add_tail(&lp->delay_list, &ls->delayed);
spin_unlock(&ls->async_lock);
}
/* convert gfs lock-state to dlm lock-mode */
static int16_t make_mode(int16_t lmstate)
{
switch (lmstate) {
case LM_ST_UNLOCKED:
return DLM_LOCK_NL;
case LM_ST_EXCLUSIVE:
return DLM_LOCK_EX;
case LM_ST_DEFERRED:
return DLM_LOCK_CW;
case LM_ST_SHARED:
return DLM_LOCK_PR;
default:
GDLM_ASSERT(0, printk("unknown LM state %d\n", lmstate););
}
}
/* convert dlm lock-mode to gfs lock-state */
int16_t gdlm_make_lmstate(int16_t dlmmode)
{
switch (dlmmode) {
case DLM_LOCK_IV:
case DLM_LOCK_NL:
return LM_ST_UNLOCKED;
case DLM_LOCK_EX:
return LM_ST_EXCLUSIVE;
case DLM_LOCK_CW:
return LM_ST_DEFERRED;
case DLM_LOCK_PR:
return LM_ST_SHARED;
default:
GDLM_ASSERT(0, printk("unknown DLM mode %d\n", dlmmode););
}
}
/* verify agreement with GFS on the current lock state, NB: DLM_LOCK_NL and
DLM_LOCK_IV are both considered LM_ST_UNLOCKED by GFS. */
static void check_cur_state(struct gdlm_lock *lp, unsigned int cur_state)
{
int16_t cur = make_mode(cur_state);
if (lp->cur != DLM_LOCK_IV)
GDLM_ASSERT(lp->cur == cur, printk("%d, %d\n", lp->cur, cur););
}
static inline unsigned int make_flags(struct gdlm_lock *lp,
unsigned int gfs_flags,
int16_t cur, int16_t req)
{
unsigned int lkf = 0;
if (gfs_flags & LM_FLAG_TRY)
lkf |= DLM_LKF_NOQUEUE;
if (gfs_flags & LM_FLAG_TRY_1CB) {
lkf |= DLM_LKF_NOQUEUE;
lkf |= DLM_LKF_NOQUEUEBAST;
}
if (gfs_flags & LM_FLAG_PRIORITY) {
lkf |= DLM_LKF_NOORDER;
lkf |= DLM_LKF_HEADQUE;
}
if (gfs_flags & LM_FLAG_ANY) {
if (req == DLM_LOCK_PR)
lkf |= DLM_LKF_ALTCW;
else if (req == DLM_LOCK_CW)
lkf |= DLM_LKF_ALTPR;
}
if (lp->lksb.sb_lkid != 0) {
lkf |= DLM_LKF_CONVERT;
/* Conversion deadlock avoidance by DLM */
if (!test_bit(LFL_FORCE_PROMOTE, &lp->flags) &&
!(lkf & DLM_LKF_NOQUEUE) &&
cur > DLM_LOCK_NL && req > DLM_LOCK_NL && cur != req)
lkf |= DLM_LKF_CONVDEADLK;
}
if (lp->lvb)
lkf |= DLM_LKF_VALBLK;
return lkf;
}
/* make_strname - convert GFS lock numbers to a string */
static inline void make_strname(struct lm_lockname *lockname,
struct gdlm_strname *str)
{
sprintf(str->name, "%8x%16"PRIx64, lockname->ln_type,
lockname->ln_number);
str->namelen = GDLM_STRNAME_BYTES;
}
int gdlm_create_lp(struct gdlm_ls *ls, struct lm_lockname *name,
struct gdlm_lock **lpp)
{
struct gdlm_lock *lp;
lp = kmalloc(sizeof(struct gdlm_lock), GFP_KERNEL);
if (!lp)
return -ENOMEM;
memset(lp, 0, sizeof(struct gdlm_lock));
lp->lockname = *name;
lp->ls = ls;
lp->cur = DLM_LOCK_IV;
lp->lvb = NULL;
lp->hold_null = NULL;
init_completion(&lp->ast_wait);
INIT_LIST_HEAD(&lp->clist);
INIT_LIST_HEAD(&lp->blist);
INIT_LIST_HEAD(&lp->delay_list);
spin_lock(&ls->async_lock);
list_add(&lp->all_list, &ls->all_locks);
ls->all_locks_count++;
spin_unlock(&ls->async_lock);
*lpp = lp;
return 0;
}
void gdlm_delete_lp(struct gdlm_lock *lp)
{
struct gdlm_ls *ls = lp->ls;
spin_lock(&ls->async_lock);
if (!list_empty(&lp->clist))
list_del_init(&lp->clist);
if (!list_empty(&lp->blist))
list_del_init(&lp->blist);
if (!list_empty(&lp->delay_list))
list_del_init(&lp->delay_list);
GDLM_ASSERT(!list_empty(&lp->all_list),);
list_del_init(&lp->all_list);
ls->all_locks_count--;
spin_unlock(&ls->async_lock);
kfree(lp);
}
int gdlm_get_lock(lm_lockspace_t *lockspace, struct lm_lockname *name,
lm_lock_t **lockp)
{
struct gdlm_lock *lp;
int error;
error = gdlm_create_lp((struct gdlm_ls *) lockspace, name, &lp);
*lockp = (lm_lock_t *) lp;
return error;
}
void gdlm_put_lock(lm_lock_t *lock)
{
gdlm_delete_lp((struct gdlm_lock *) lock);
}
void gdlm_do_lock(struct gdlm_lock *lp, struct dlm_range *range)
{
struct gdlm_ls *ls = lp->ls;
struct gdlm_strname str;
int error, bast = 1;
/*
* When recovery is in progress, delay lock requests for submission
* once recovery is done. Requests for recovery (NOEXP) and unlocks
* can pass.
*/
if (test_bit(DFL_BLOCK_LOCKS, &ls->flags) &&
!test_bit(LFL_NOBLOCK, &lp->flags) && lp->req != DLM_LOCK_NL) {
gdlm_queue_delayed(lp);
return;
}
/*
* Submit the actual lock request.
*/
if (test_bit(LFL_NOBAST, &lp->flags))
bast = 0;
make_strname(&lp->lockname, &str);
set_bit(LFL_ACTIVE, &lp->flags);
log_debug("lk %x,%"PRIx64" id %x %d,%d %x", lp->lockname.ln_type,
lp->lockname.ln_number, lp->lksb.sb_lkid,
lp->cur, lp->req, lp->lkf);
error = dlm_lock(ls->dlm_lockspace, lp->req, &lp->lksb, lp->lkf,
str.name, str.namelen, 0, gdlm_ast, (void *) lp,
bast ? gdlm_bast : NULL, range);
if ((error == -EAGAIN) && (lp->lkf & DLM_LKF_NOQUEUE)) {
lp->lksb.sb_status = -EAGAIN;
queue_complete(lp);
error = 0;
}
GDLM_ASSERT(!error,
printk("%s: num=%x,%"PRIx64" err=%d cur=%d req=%d lkf=%x\n",
ls->fsname, lp->lockname.ln_type,
lp->lockname.ln_number, error, lp->cur, lp->req,
lp->lkf););
}
void gdlm_do_unlock(struct gdlm_lock *lp)
{
unsigned int lkf = 0;
int error;
set_bit(LFL_DLM_UNLOCK, &lp->flags);
set_bit(LFL_ACTIVE, &lp->flags);
if (lp->lvb)
lkf = DLM_LKF_VALBLK;
log_debug("un %x,%"PRIx64" %x %d %x", lp->lockname.ln_type,
lp->lockname.ln_number, lp->lksb.sb_lkid, lp->cur, lkf);
error = dlm_unlock(lp->ls->dlm_lockspace, lp->lksb.sb_lkid, lkf,
NULL, lp);
GDLM_ASSERT(!error,
printk("%s: error=%d num=%x,%"PRIx64" lkf=%x flags=%lx\n",
lp->ls->fsname, error, lp->lockname.ln_type,
lp->lockname.ln_number, lkf, lp->flags););
}
unsigned int gdlm_lock(lm_lock_t *lock, unsigned int cur_state,
unsigned int req_state, unsigned int flags)
{
struct gdlm_lock *lp = (struct gdlm_lock *) lock;
clear_bit(LFL_DLM_CANCEL, &lp->flags);
if (flags & LM_FLAG_NOEXP)
set_bit(LFL_NOBLOCK, &lp->flags);
check_cur_state(lp, cur_state);
lp->req = make_mode(req_state);
lp->lkf = make_flags(lp, flags, lp->cur, lp->req);
gdlm_do_lock(lp, NULL);
return LM_OUT_ASYNC;
}
unsigned int gdlm_unlock(lm_lock_t *lock, unsigned int cur_state)
{
struct gdlm_lock *lp = (struct gdlm_lock *) lock;
clear_bit(LFL_DLM_CANCEL, &lp->flags);
if (lp->cur == DLM_LOCK_IV)
return 0;
gdlm_do_unlock(lp);
return LM_OUT_ASYNC;
}
void gdlm_cancel(lm_lock_t *lock)
{
struct gdlm_lock *lp = (struct gdlm_lock *) lock;
struct gdlm_ls *ls = lp->ls;
int error, delay_list = 0;
if (test_bit(LFL_DLM_CANCEL, &lp->flags))
return;
log_all("gdlm_cancel %x,%"PRIx64" flags %lx",
lp->lockname.ln_type, lp->lockname.ln_number, lp->flags);
spin_lock(&ls->async_lock);
if (!list_empty(&lp->delay_list)) {
list_del_init(&lp->delay_list);
delay_list = 1;
}
spin_unlock(&ls->async_lock);
if (delay_list) {
set_bit(LFL_CANCEL, &lp->flags);
set_bit(LFL_ACTIVE, &lp->flags);
queue_complete(lp);
return;
}
if (!test_bit(LFL_ACTIVE, &lp->flags) ||
test_bit(LFL_DLM_UNLOCK, &lp->flags)) {
log_all("gdlm_cancel skip %x,%"PRIx64" flags %lx",
lp->lockname.ln_type, lp->lockname.ln_number,
lp->flags);
return;
}
/* the lock is blocked in the dlm */
set_bit(LFL_DLM_CANCEL, &lp->flags);
set_bit(LFL_ACTIVE, &lp->flags);
error = dlm_unlock(ls->dlm_lockspace, lp->lksb.sb_lkid, DLM_LKF_CANCEL,
NULL, lp);
log_all("gdlm_cancel rv %d %x,%"PRIx64" flags %lx", error,
lp->lockname.ln_type, lp->lockname.ln_number, lp->flags);
if (error == -EBUSY)
clear_bit(LFL_DLM_CANCEL, &lp->flags);
}
int gdlm_add_lvb(struct gdlm_lock *lp)
{
char *lvb;
lvb = kmalloc(GDLM_LVB_SIZE, GFP_KERNEL);
if (!lvb)
return -ENOMEM;
memset(lvb, 0, GDLM_LVB_SIZE);
lp->lksb.sb_lvbptr = lvb;
lp->lvb = lvb;
return 0;
}
void gdlm_del_lvb(struct gdlm_lock *lp)
{
kfree(lp->lvb);
lp->lvb = NULL;
lp->lksb.sb_lvbptr = NULL;
}
/* This can do a synchronous dlm request (requiring a lock_dlm thread to get
the completion) because gfs won't call hold_lvb() during a callback (from
the context of a lock_dlm thread). */
static int hold_null_lock(struct gdlm_lock *lp)
{
struct gdlm_lock *lpn = NULL;
int error;
if (lp->hold_null) {
printk("lock_dlm: lvb already held\n");
return 0;
}
error = gdlm_create_lp(lp->ls, &lp->lockname, &lpn);
if (error)
goto out;
lpn->lksb.sb_lvbptr = junk_lvb;
lpn->lvb = junk_lvb;
lpn->req = DLM_LOCK_NL;
lpn->lkf = DLM_LKF_VALBLK | DLM_LKF_EXPEDITE;
set_bit(LFL_NOBAST, &lpn->flags);
set_bit(LFL_INLOCK, &lpn->flags);
init_completion(&lpn->ast_wait);
gdlm_do_lock(lpn, NULL);
wait_for_completion(&lpn->ast_wait);
error = lp->lksb.sb_status;
if (error) {
printk("lock_dlm: hold_null_lock dlm error %d\n", error);
gdlm_delete_lp(lpn);
lpn = NULL;
}
out:
lp->hold_null = lpn;
return error;
}
/* This cannot do a synchronous dlm request (requiring a lock_dlm thread to get
the completion) because gfs may call unhold_lvb() during a callback (from
the context of a lock_dlm thread) which could cause a deadlock since the
other lock_dlm thread could be engaged in recovery. */
static void unhold_null_lock(struct gdlm_lock *lp)
{
struct gdlm_lock *lpn = lp->hold_null;
GDLM_ASSERT(lpn,);
lpn->lksb.sb_lvbptr = NULL;
lpn->lvb = NULL;
set_bit(LFL_UNLOCK_DELETE, &lpn->flags);
gdlm_do_unlock(lpn);
lp->hold_null = NULL;
}
/* Acquire a NL lock because gfs requires the value block to remain
intact on the resource while the lvb is "held" even if it's holding no locks
on the resource. */
int gdlm_hold_lvb(lm_lock_t *lock, char **lvbp)
{
struct gdlm_lock *lp = (struct gdlm_lock *) lock;
int error;
error = gdlm_add_lvb(lp);
if (error)
return error;
*lvbp = lp->lvb;
error = hold_null_lock(lp);
if (error)
gdlm_del_lvb(lp);
return error;
}
void gdlm_unhold_lvb(lm_lock_t *lock, char *lvb)
{
struct gdlm_lock *lp = (struct gdlm_lock *) lock;
unhold_null_lock(lp);
gdlm_del_lvb(lp);
}
void gdlm_sync_lvb(lm_lock_t *lock, char *lvb)
{
struct gdlm_lock *lp = (struct gdlm_lock *) lock;
if (lp->cur != DLM_LOCK_EX)
return;
init_completion(&lp->ast_wait);
set_bit(LFL_SYNC_LVB, &lp->flags);
lp->req = DLM_LOCK_EX;
lp->lkf = make_flags(lp, 0, lp->cur, lp->req);
gdlm_do_lock(lp, NULL);
wait_for_completion(&lp->ast_wait);
}
void gdlm_submit_delayed(struct gdlm_ls *ls)
{
struct gdlm_lock *lp, *safe;
spin_lock(&ls->async_lock);
list_for_each_entry_safe(lp, safe, &ls->delayed, delay_list) {
list_del_init(&lp->delay_list);
list_add_tail(&lp->delay_list, &ls->submit);
}
spin_unlock(&ls->async_lock);
wake_up(&ls->thread_wait);
}
int gdlm_release_all_locks(struct gdlm_ls *ls)
{
struct gdlm_lock *lp, *safe;
int count = 0;
spin_lock(&ls->async_lock);
list_for_each_entry_safe(lp, safe, &ls->all_locks, all_list) {
list_del_init(&lp->all_list);
if (lp->lvb && lp->lvb != junk_lvb)
kfree(lp->lvb);
kfree(lp);
count++;
}
spin_unlock(&ls->async_lock);
return count;
}

58
fs/gfs2/locking/dlm/main.c Normal file
View File

@ -0,0 +1,58 @@
/******************************************************************************
*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
** Copyright (C) 2004-2005 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.
**
*******************************************************************************
******************************************************************************/
#include <linux/init.h>
#include "lock_dlm.h"
extern int gdlm_drop_count;
extern int gdlm_drop_period;
extern struct lm_lockops gdlm_ops;
int __init init_lock_dlm(void)
{
int error;
error = lm_register_proto(&gdlm_ops);
if (error) {
printk("lock_dlm: can't register protocol: %d\n", error);
return error;
}
error = gdlm_sysfs_init();
if (error) {
lm_unregister_proto(&gdlm_ops);
return error;
}
gdlm_drop_count = GDLM_DROP_COUNT;
gdlm_drop_period = GDLM_DROP_PERIOD;
printk("Lock_DLM (built %s %s) installed\n", __DATE__, __TIME__);
return 0;
}
void __exit exit_lock_dlm(void)
{
lm_unregister_proto(&gdlm_ops);
gdlm_sysfs_exit();
}
module_init(init_lock_dlm);
module_exit(exit_lock_dlm);
MODULE_DESCRIPTION("GFS DLM Locking Module");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");

240
fs/gfs2/locking/dlm/mount.c Normal file
View File

@ -0,0 +1,240 @@
/******************************************************************************
*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
** Copyright (C) 2004-2005 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.
**
*******************************************************************************
******************************************************************************/
#include "lock_dlm.h"
int gdlm_drop_count;
int gdlm_drop_period;
struct lm_lockops gdlm_ops;
static struct gdlm_ls *init_gdlm(lm_callback_t cb, lm_fsdata_t *fsdata,
int flags, char *table_name)
{
struct gdlm_ls *ls;
char buf[256], *p;
ls = kmalloc(sizeof(struct gdlm_ls), GFP_KERNEL);
if (!ls)
return NULL;
memset(ls, 0, sizeof(struct gdlm_ls));
ls->drop_locks_count = gdlm_drop_count;
ls->drop_locks_period = gdlm_drop_period;
ls->fscb = cb;
ls->fsdata = fsdata;
ls->fsflags = flags;
spin_lock_init(&ls->async_lock);
INIT_LIST_HEAD(&ls->complete);
INIT_LIST_HEAD(&ls->blocking);
INIT_LIST_HEAD(&ls->delayed);
INIT_LIST_HEAD(&ls->submit);
INIT_LIST_HEAD(&ls->all_locks);
init_waitqueue_head(&ls->thread_wait);
init_waitqueue_head(&ls->wait_control);
ls->thread1 = NULL;
ls->thread2 = NULL;
ls->drop_time = jiffies;
ls->jid = -1;
strncpy(buf, table_name, 256);
buf[255] = '\0';
p = strstr(buf, ":");
if (!p) {
printk("lock_dlm: invalid table_name \"%s\"\n", table_name);
kfree(ls);
return NULL;
}
*p = '\0';
p++;
strncpy(ls->clustername, buf, 128);
strncpy(ls->fsname, p, 128);
return ls;
}
static int gdlm_mount(char *table_name, char *host_data,
lm_callback_t cb, lm_fsdata_t *fsdata,
unsigned int min_lvb_size, int flags,
struct lm_lockstruct *lockstruct)
{
struct gdlm_ls *ls;
int error = -ENOMEM;
if (min_lvb_size > GDLM_LVB_SIZE)
goto out;
ls = init_gdlm(cb, fsdata, flags, table_name);
if (!ls)
goto out;
error = gdlm_init_threads(ls);
if (error)
goto out_free;
error = dlm_new_lockspace(ls->fsname, strlen(ls->fsname),
&ls->dlm_lockspace, 0, GDLM_LVB_SIZE);
if (error) {
printk("lock_dlm: dlm_new_lockspace error %d\n", error);
goto out_thread;
}
error = gdlm_kobject_setup(ls);
if (error)
goto out_dlm;
kobject_uevent(&ls->kobj, KOBJ_MOUNT, NULL);
/* Now we depend on userspace to notice the new mount,
join the appropriate group, and do a write to our sysfs
"mounted" or "terminate" file. Before the start, userspace
must set "jid" and "first". */
error = wait_event_interruptible(ls->wait_control,
test_bit(DFL_JOIN_DONE, &ls->flags));
if (error)
goto out_sysfs;
if (test_bit(DFL_TERMINATE, &ls->flags)) {
error = -ERESTARTSYS;
goto out_sysfs;
}
lockstruct->ls_jid = ls->jid;
lockstruct->ls_first = ls->first;
lockstruct->ls_lockspace = ls;
lockstruct->ls_ops = &gdlm_ops;
lockstruct->ls_flags = 0;
lockstruct->ls_lvb_size = GDLM_LVB_SIZE;
return 0;
out_sysfs:
gdlm_kobject_release(ls);
out_dlm:
dlm_release_lockspace(ls->dlm_lockspace, 2);
out_thread:
gdlm_release_threads(ls);
out_free:
kfree(ls);
out:
return error;
}
static void gdlm_unmount(lm_lockspace_t *lockspace)
{
struct gdlm_ls *ls = (struct gdlm_ls *) lockspace;
int rv;
log_debug("unmount flags %lx", ls->flags);
if (test_bit(DFL_WITHDRAW, &ls->flags)) {
gdlm_kobject_release(ls);
goto out;
}
kobject_uevent(&ls->kobj, KOBJ_UMOUNT, NULL);
wait_event_interruptible(ls->wait_control,
test_bit(DFL_LEAVE_DONE, &ls->flags));
gdlm_kobject_release(ls);
dlm_release_lockspace(ls->dlm_lockspace, 2);
gdlm_release_threads(ls);
rv = gdlm_release_all_locks(ls);
if (rv)
log_all("lm_dlm_unmount: %d stray locks freed", rv);
out:
kfree(ls);
}
static void gdlm_recovery_done(lm_lockspace_t *lockspace, unsigned int jid,
unsigned int message)
{
struct gdlm_ls *ls = (struct gdlm_ls *) lockspace;
ls->recover_done = jid;
kobject_uevent(&ls->kobj, KOBJ_CHANGE, NULL);
}
static void gdlm_others_may_mount(lm_lockspace_t *lockspace)
{
struct gdlm_ls *ls = (struct gdlm_ls *) lockspace;
ls->first_done = 1;
kobject_uevent(&ls->kobj, KOBJ_CHANGE, NULL);
}
static void gdlm_withdraw(lm_lockspace_t *lockspace)
{
struct gdlm_ls *ls = (struct gdlm_ls *) lockspace;
/* userspace suspends locking on all other members */
kobject_uevent(&ls->kobj, KOBJ_OFFLINE, NULL);
wait_event_interruptible(ls->wait_control,
test_bit(DFL_WITHDRAW, &ls->flags));
dlm_release_lockspace(ls->dlm_lockspace, 2);
gdlm_release_threads(ls);
gdlm_release_all_locks(ls);
kobject_uevent(&ls->kobj, KOBJ_UMOUNT, NULL);
/* userspace leaves the mount group, we don't need to wait for
that to complete */
}
int gdlm_plock_get(lm_lockspace_t *lockspace, struct lm_lockname *name,
struct file *file, struct file_lock *fl)
{
return -ENOSYS;
}
int gdlm_punlock(lm_lockspace_t *lockspace, struct lm_lockname *name,
struct file *file, struct file_lock *fl)
{
return -ENOSYS;
}
int gdlm_plock(lm_lockspace_t *lockspace, struct lm_lockname *name,
struct file *file, int cmd, struct file_lock *fl)
{
return -ENOSYS;
}
struct lm_lockops gdlm_ops = {
lm_proto_name:"lock_dlm",
lm_mount:gdlm_mount,
lm_others_may_mount:gdlm_others_may_mount,
lm_unmount:gdlm_unmount,
lm_withdraw:gdlm_withdraw,
lm_get_lock:gdlm_get_lock,
lm_put_lock:gdlm_put_lock,
lm_lock:gdlm_lock,
lm_unlock:gdlm_unlock,
lm_plock:gdlm_plock,
lm_punlock:gdlm_punlock,
lm_plock_get:gdlm_plock_get,
lm_cancel:gdlm_cancel,
lm_hold_lvb:gdlm_hold_lvb,
lm_unhold_lvb:gdlm_unhold_lvb,
lm_sync_lvb:gdlm_sync_lvb,
lm_recovery_done:gdlm_recovery_done,
lm_owner:THIS_MODULE,
};

315
fs/gfs2/locking/dlm/sysfs.c Normal file
View File

@ -0,0 +1,315 @@
/******************************************************************************
*******************************************************************************
**
** 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.
**
*******************************************************************************
******************************************************************************/
#include <linux/ctype.h>
#include <linux/stat.h>
#include "lock_dlm.h"
static ssize_t gdlm_block_show(struct gdlm_ls *ls, char *buf)
{
ssize_t ret;
int val = 0;
if (test_bit(DFL_BLOCK_LOCKS, &ls->flags))
val = 1;
ret = sprintf(buf, "%d\n", val);
return ret;
}
static ssize_t gdlm_block_store(struct gdlm_ls *ls, const char *buf, size_t len)
{
ssize_t ret = len;
int val;
val = simple_strtol(buf, NULL, 0);
if (val == 1)
set_bit(DFL_BLOCK_LOCKS, &ls->flags);
else if (val == 0) {
clear_bit(DFL_BLOCK_LOCKS, &ls->flags);
gdlm_submit_delayed(ls);
} else
ret = -EINVAL;
return ret;
}
static ssize_t gdlm_mounted_show(struct gdlm_ls *ls, char *buf)
{
ssize_t ret;
int val = -2;
if (test_bit(DFL_TERMINATE, &ls->flags))
val = -1;
else if (test_bit(DFL_LEAVE_DONE, &ls->flags))
val = 0;
else if (test_bit(DFL_JOIN_DONE, &ls->flags))
val = 1;
ret = sprintf(buf, "%d\n", val);
return ret;
}
static ssize_t gdlm_mounted_store(struct gdlm_ls *ls, const char *buf, size_t len)
{
ssize_t ret = len;
int val;
val = simple_strtol(buf, NULL, 0);
if (val == 1)
set_bit(DFL_JOIN_DONE, &ls->flags);
else if (val == 0)
set_bit(DFL_LEAVE_DONE, &ls->flags);
else if (val == -1) {
set_bit(DFL_TERMINATE, &ls->flags);
set_bit(DFL_JOIN_DONE, &ls->flags);
set_bit(DFL_LEAVE_DONE, &ls->flags);
} else
ret = -EINVAL;
wake_up(&ls->wait_control);
return ret;
}
static ssize_t gdlm_withdraw_show(struct gdlm_ls *ls, char *buf)
{
ssize_t ret;
int val = 0;
if (test_bit(DFL_WITHDRAW, &ls->flags))
val = 1;
ret = sprintf(buf, "%d\n", val);
return ret;
}
static ssize_t gdlm_withdraw_store(struct gdlm_ls *ls, const char *buf, size_t len)
{
ssize_t ret = len;
int val;
val = simple_strtol(buf, NULL, 0);
if (val == 1)
set_bit(DFL_WITHDRAW, &ls->flags);
else
ret = -EINVAL;
wake_up(&ls->wait_control);
return ret;
}
static ssize_t gdlm_jid_show(struct gdlm_ls *ls, char *buf)
{
return sprintf(buf, "%u\n", ls->jid);
}
static ssize_t gdlm_jid_store(struct gdlm_ls *ls, const char *buf, size_t len)
{
ls->jid = simple_strtol(buf, NULL, 0);
return len;
}
static ssize_t gdlm_first_show(struct gdlm_ls *ls, char *buf)
{
return sprintf(buf, "%u\n", ls->first);
}
static ssize_t gdlm_first_store(struct gdlm_ls *ls, const char *buf, size_t len)
{
ls->first = simple_strtol(buf, NULL, 0);
return len;
}
static ssize_t gdlm_first_done_show(struct gdlm_ls *ls, char *buf)
{
return sprintf(buf, "%d\n", ls->first_done);
}
static ssize_t gdlm_recover_show(struct gdlm_ls *ls, char *buf)
{
return sprintf(buf, "%u\n", ls->recover_jid);
}
static ssize_t gdlm_recover_store(struct gdlm_ls *ls, const char *buf, size_t len)
{
ls->recover_jid = simple_strtol(buf, NULL, 0);
ls->fscb(ls->fsdata, LM_CB_NEED_RECOVERY, &ls->recover_jid);
return len;
}
static ssize_t gdlm_recover_done_show(struct gdlm_ls *ls, char *buf)
{
ssize_t ret;
ret = sprintf(buf, "%d\n", ls->recover_done);
return ret;
}
static ssize_t gdlm_cluster_show(struct gdlm_ls *ls, char *buf)
{
ssize_t ret;
ret = sprintf(buf, "%s\n", ls->clustername);
return ret;
}
static ssize_t gdlm_options_show(struct gdlm_ls *ls, char *buf)
{
ssize_t ret = 0;
if (ls->fsflags & LM_MFLAG_SPECTATOR)
ret += sprintf(buf, "spectator ");
return ret;
}
struct gdlm_attr {
struct attribute attr;
ssize_t (*show)(struct gdlm_ls *, char *);
ssize_t (*store)(struct gdlm_ls *, const char *, size_t);
};
static struct gdlm_attr gdlm_attr_block = {
.attr = {.name = "block", .mode = S_IRUGO | S_IWUSR},
.show = gdlm_block_show,
.store = gdlm_block_store
};
static struct gdlm_attr gdlm_attr_mounted = {
.attr = {.name = "mounted", .mode = S_IRUGO | S_IWUSR},
.show = gdlm_mounted_show,
.store = gdlm_mounted_store
};
static struct gdlm_attr gdlm_attr_withdraw = {
.attr = {.name = "withdraw", .mode = S_IRUGO | S_IWUSR},
.show = gdlm_withdraw_show,
.store = gdlm_withdraw_store
};
static struct gdlm_attr gdlm_attr_jid = {
.attr = {.name = "jid", .mode = S_IRUGO | S_IWUSR},
.show = gdlm_jid_show,
.store = gdlm_jid_store
};
static struct gdlm_attr gdlm_attr_first = {
.attr = {.name = "first", .mode = S_IRUGO | S_IWUSR},
.show = gdlm_first_show,
.store = gdlm_first_store
};
static struct gdlm_attr gdlm_attr_first_done = {
.attr = {.name = "first_done", .mode = S_IRUGO},
.show = gdlm_first_done_show,
};
static struct gdlm_attr gdlm_attr_recover = {
.attr = {.name = "recover", .mode = S_IRUGO | S_IWUSR},
.show = gdlm_recover_show,
.store = gdlm_recover_store
};
static struct gdlm_attr gdlm_attr_recover_done = {
.attr = {.name = "recover_done", .mode = S_IRUGO | S_IWUSR},
.show = gdlm_recover_done_show,
};
static struct gdlm_attr gdlm_attr_cluster = {
.attr = {.name = "cluster", .mode = S_IRUGO | S_IWUSR},
.show = gdlm_cluster_show,
};
static struct gdlm_attr gdlm_attr_options = {
.attr = {.name = "options", .mode = S_IRUGO | S_IWUSR},
.show = gdlm_options_show,
};
static struct attribute *gdlm_attrs[] = {
&gdlm_attr_block.attr,
&gdlm_attr_mounted.attr,
&gdlm_attr_withdraw.attr,
&gdlm_attr_jid.attr,
&gdlm_attr_first.attr,
&gdlm_attr_first_done.attr,
&gdlm_attr_recover.attr,
&gdlm_attr_recover_done.attr,
&gdlm_attr_cluster.attr,
&gdlm_attr_options.attr,
NULL,
};
static ssize_t gdlm_attr_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr);
return a->show ? a->show(ls, buf) : 0;
}
static ssize_t gdlm_attr_store(struct kobject *kobj, struct attribute *attr,
const char *buf, size_t len)
{
struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr);
return a->store ? a->store(ls, buf, len) : len;
}
static struct sysfs_ops gdlm_attr_ops = {
.show = gdlm_attr_show,
.store = gdlm_attr_store,
};
static struct kobj_type gdlm_ktype = {
.default_attrs = gdlm_attrs,
.sysfs_ops = &gdlm_attr_ops,
};
static struct kset gdlm_kset = {
.subsys = &kernel_subsys,
.kobj = {.name = "lock_dlm",},
.ktype = &gdlm_ktype,
};
int gdlm_kobject_setup(struct gdlm_ls *ls)
{
int error;
error = kobject_set_name(&ls->kobj, "%s", ls->fsname);
if (error)
return error;
ls->kobj.kset = &gdlm_kset;
ls->kobj.ktype = &gdlm_ktype;
error = kobject_register(&ls->kobj);
return 0;
}
void gdlm_kobject_release(struct gdlm_ls *ls)
{
kobject_unregister(&ls->kobj);
}
int gdlm_sysfs_init(void)
{
int error;
error = kset_register(&gdlm_kset);
if (error)
printk("lock_dlm: cannot register kset %d\n", error);
return error;
}
void gdlm_sysfs_exit(void)
{
kset_unregister(&gdlm_kset);
}

359
fs/gfs2/locking/dlm/thread.c Normal file
View File

@ -0,0 +1,359 @@
/******************************************************************************
*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
** Copyright (C) 2004-2005 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.
**
*******************************************************************************
******************************************************************************/
#include "lock_dlm.h"
/* A lock placed on this queue is re-submitted to DLM as soon as the lock_dlm
thread gets to it. */
static void queue_submit(struct gdlm_lock *lp)
{
struct gdlm_ls *ls = lp->ls;
spin_lock(&ls->async_lock);
list_add_tail(&lp->delay_list, &ls->submit);
spin_unlock(&ls->async_lock);
wake_up(&ls->thread_wait);
}
static void process_submit(struct gdlm_lock *lp)
{
gdlm_do_lock(lp, NULL);
}
static void process_blocking(struct gdlm_lock *lp, int bast_mode)
{
struct gdlm_ls *ls = lp->ls;
unsigned int cb;
switch (gdlm_make_lmstate(bast_mode)) {
case LM_ST_EXCLUSIVE:
cb = LM_CB_NEED_E;
break;
case LM_ST_DEFERRED:
cb = LM_CB_NEED_D;
break;
case LM_ST_SHARED:
cb = LM_CB_NEED_S;
break;
default:
GDLM_ASSERT(0, printk("unknown bast mode %u\n",lp->bast_mode););
}
ls->fscb(ls->fsdata, cb, &lp->lockname);
}
static void process_complete(struct gdlm_lock *lp)
{
struct gdlm_ls *ls = lp->ls;
struct lm_async_cb acb;
int16_t prev_mode = lp->cur;
memset(&acb, 0, sizeof(acb));
if (lp->lksb.sb_status == -DLM_ECANCEL) {
log_all("complete dlm cancel %x,%"PRIx64" flags %lx",
lp->lockname.ln_type, lp->lockname.ln_number,
lp->flags);
lp->req = lp->cur;
acb.lc_ret |= LM_OUT_CANCELED;
if (lp->cur == DLM_LOCK_IV)
lp->lksb.sb_lkid = 0;
goto out;
}
if (test_and_clear_bit(LFL_DLM_UNLOCK, &lp->flags)) {
if (lp->lksb.sb_status != -DLM_EUNLOCK) {
log_all("unlock sb_status %d %x,%"PRIx64" flags %lx",
lp->lksb.sb_status, lp->lockname.ln_type,
lp->lockname.ln_number, lp->flags);
return;
}
lp->cur = DLM_LOCK_IV;
lp->req = DLM_LOCK_IV;
lp->lksb.sb_lkid = 0;
if (test_and_clear_bit(LFL_UNLOCK_DELETE, &lp->flags)) {
gdlm_delete_lp(lp);
return;
}
goto out;
}
if (lp->lksb.sb_flags & DLM_SBF_VALNOTVALID)
memset(lp->lksb.sb_lvbptr, 0, GDLM_LVB_SIZE);
if (lp->lksb.sb_flags & DLM_SBF_ALTMODE) {
if (lp->req == DLM_LOCK_PR)
lp->req = DLM_LOCK_CW;
else if (lp->req == DLM_LOCK_CW)
lp->req = DLM_LOCK_PR;
}
/*
* A canceled lock request. The lock was just taken off the delayed
* list and was never even submitted to dlm.
*/
if (test_and_clear_bit(LFL_CANCEL, &lp->flags)) {
log_all("complete internal cancel %x,%"PRIx64"",
lp->lockname.ln_type, lp->lockname.ln_number);
lp->req = lp->cur;
acb.lc_ret |= LM_OUT_CANCELED;
goto out;
}
/*
* An error occured.
*/
if (lp->lksb.sb_status) {
/* a "normal" error */
if ((lp->lksb.sb_status == -EAGAIN) &&
(lp->lkf & DLM_LKF_NOQUEUE)) {
lp->req = lp->cur;
if (lp->cur == DLM_LOCK_IV)
lp->lksb.sb_lkid = 0;
goto out;
}
/* this could only happen with cancels I think */
log_all("ast sb_status %d %x,%"PRIx64" flags %lx",
lp->lksb.sb_status, lp->lockname.ln_type,
lp->lockname.ln_number, lp->flags);
return;
}
/*
* This is an AST for an EX->EX conversion for sync_lvb from GFS.
*/
if (test_and_clear_bit(LFL_SYNC_LVB, &lp->flags)) {
complete(&lp->ast_wait);
return;
}
/*
* A lock has been demoted to NL because it initially completed during
* BLOCK_LOCKS. Now it must be requested in the originally requested
* mode.
*/
if (test_and_clear_bit(LFL_REREQUEST, &lp->flags)) {
GDLM_ASSERT(lp->req == DLM_LOCK_NL,);
GDLM_ASSERT(lp->prev_req > DLM_LOCK_NL,);
lp->cur = DLM_LOCK_NL;
lp->req = lp->prev_req;
lp->prev_req = DLM_LOCK_IV;
lp->lkf &= ~DLM_LKF_CONVDEADLK;
set_bit(LFL_NOCACHE, &lp->flags);
if (test_bit(DFL_BLOCK_LOCKS, &ls->flags) &&
!test_bit(LFL_NOBLOCK, &lp->flags))
gdlm_queue_delayed(lp);
else
queue_submit(lp);
return;
}
/*
* A request is granted during dlm recovery. It may be granted
* because the locks of a failed node were cleared. In that case,
* there may be inconsistent data beneath this lock and we must wait
* for recovery to complete to use it. When gfs recovery is done this
* granted lock will be converted to NL and then reacquired in this
* granted state.
*/
if (test_bit(DFL_BLOCK_LOCKS, &ls->flags) &&
!test_bit(LFL_NOBLOCK, &lp->flags) &&
lp->req != DLM_LOCK_NL) {
lp->cur = lp->req;
lp->prev_req = lp->req;
lp->req = DLM_LOCK_NL;
lp->lkf |= DLM_LKF_CONVERT;
lp->lkf &= ~DLM_LKF_CONVDEADLK;
log_debug("rereq %x,%"PRIx64" id %x %d,%d",
lp->lockname.ln_type, lp->lockname.ln_number,
lp->lksb.sb_lkid, lp->cur, lp->req);
set_bit(LFL_REREQUEST, &lp->flags);
queue_submit(lp);
return;
}
/*
* DLM demoted the lock to NL before it was granted so GFS must be
* told it cannot cache data for this lock.
*/
if (lp->lksb.sb_flags & DLM_SBF_DEMOTED)
set_bit(LFL_NOCACHE, &lp->flags);
out:
/*
* This is an internal lock_dlm lock
*/
if (test_bit(LFL_INLOCK, &lp->flags)) {
clear_bit(LFL_NOBLOCK, &lp->flags);
lp->cur = lp->req;
complete(&lp->ast_wait);
return;
}
/*
* Normal completion of a lock request. Tell GFS it now has the lock.
*/
clear_bit(LFL_NOBLOCK, &lp->flags);
lp->cur = lp->req;
acb.lc_name = lp->lockname;
acb.lc_ret |= gdlm_make_lmstate(lp->cur);
if (!test_and_clear_bit(LFL_NOCACHE, &lp->flags) &&
(lp->cur > DLM_LOCK_NL) && (prev_mode > DLM_LOCK_NL))
acb.lc_ret |= LM_OUT_CACHEABLE;
ls->fscb(ls->fsdata, LM_CB_ASYNC, &acb);
}
static inline int no_work(struct gdlm_ls *ls, int blocking)
{
int ret;
spin_lock(&ls->async_lock);
ret = list_empty(&ls->complete) && list_empty(&ls->submit);
if (ret && blocking)
ret = list_empty(&ls->blocking);
spin_unlock(&ls->async_lock);
return ret;
}
static inline int check_drop(struct gdlm_ls *ls)
{
if (!ls->drop_locks_count)
return 0;
if (time_after(jiffies, ls->drop_time + ls->drop_locks_period * HZ)) {
ls->drop_time = jiffies;
if (ls->all_locks_count >= ls->drop_locks_count)
return 1;
}
return 0;
}
static int gdlm_thread(void *data)
{
struct gdlm_ls *ls = (struct gdlm_ls *) data;
struct gdlm_lock *lp = NULL;
int blist = 0;
uint8_t complete, blocking, submit, drop;
DECLARE_WAITQUEUE(wait, current);
/* Only thread1 is allowed to do blocking callbacks since gfs
may wait for a completion callback within a blocking cb. */
if (current == ls->thread1)
blist = 1;
while (!kthread_should_stop()) {
set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(&ls->thread_wait, &wait);
if (no_work(ls, blist))
schedule();
remove_wait_queue(&ls->thread_wait, &wait);
set_current_state(TASK_RUNNING);
complete = blocking = submit = drop = 0;
spin_lock(&ls->async_lock);
if (blist && !list_empty(&ls->blocking)) {
lp = list_entry(ls->blocking.next, struct gdlm_lock,
blist);
list_del_init(&lp->blist);
blocking = lp->bast_mode;
lp->bast_mode = 0;
} else if (!list_empty(&ls->complete)) {
lp = list_entry(ls->complete.next, struct gdlm_lock,
clist);
list_del_init(&lp->clist);
complete = 1;
} else if (!list_empty(&ls->submit)) {
lp = list_entry(ls->submit.next, struct gdlm_lock,
delay_list);
list_del_init(&lp->delay_list);
submit = 1;
}
drop = check_drop(ls);
spin_unlock(&ls->async_lock);
if (complete)
process_complete(lp);
else if (blocking)
process_blocking(lp, blocking);
else if (submit)
process_submit(lp);
if (drop)
ls->fscb(ls->fsdata, LM_CB_DROPLOCKS, NULL);
schedule();
}
return 0;
}
int gdlm_init_threads(struct gdlm_ls *ls)
{
struct task_struct *p;
int error;
p = kthread_run(gdlm_thread, ls, "lock_dlm1");
error = IS_ERR(p);
if (error) {
log_all("can't start lock_dlm1 thread %d", error);
return error;
}
ls->thread1 = p;
p = kthread_run(gdlm_thread, ls, "lock_dlm2");
error = IS_ERR(p);
if (error) {
log_all("can't start lock_dlm2 thread %d", error);
kthread_stop(ls->thread1);
return error;
}
ls->thread2 = p;
return 0;
}
void gdlm_release_threads(struct gdlm_ls *ls)
{
kthread_stop(ls->thread1);
kthread_stop(ls->thread2);
}

3
fs/gfs2/locking/nolock/Makefile Normal file
View File

@ -0,0 +1,3 @@
obj-$(CONFIG_GFS2_FS) += lock_nolock.o
lock_nolock-y := main.o

44
fs/gfs2/locking/nolock/lock_nolock.mod.c Normal file
View File

@ -0,0 +1,44 @@
#include <linux/module.h>
#include <linux/vermagic.h>
#include <linux/compiler.h>
MODULE_INFO(vermagic, VERMAGIC_STRING);
#undef unix
struct module __this_module
__attribute__((section(".gnu.linkonce.this_module"))) = {
.name = __stringify(KBUILD_MODNAME),
.init = init_module,
#ifdef CONFIG_MODULE_UNLOAD
.exit = cleanup_module,
#endif
};
static const struct modversion_info ____versions[]
__attribute_used__
__attribute__((section("__versions"))) = {
{ 0x316962fc, "struct_module" },
{ 0x5a34a45c, "__kmalloc" },
{ 0x724beef2, "malloc_sizes" },
{ 0x3fa03a97, "memset" },
{ 0xc16fe12d, "__memcpy" },
{ 0xdd132261, "printk" },
{ 0x859204af, "sscanf" },
{ 0x3656bf5a, "lock_kernel" },
{ 0x1e6d26a8, "strstr" },
{ 0x41ede9df, "lm_register_proto" },
{ 0xb1f975aa, "unlock_kernel" },
{ 0x87b0b01f, "posix_lock_file_wait" },
{ 0x75f29cfd, "kmem_cache_alloc" },
{ 0x69384280, "lm_unregister_proto" },
{ 0x37a0cba, "kfree" },
{ 0x5d16bfe6, "posix_test_lock" },
};
static const char __module_depends[]
__attribute_used__
__attribute__((section(".modinfo"))) =
"depends=gfs2";
MODULE_INFO(srcversion, "123E446F965A386A0C017C4");

357
fs/gfs2/locking/nolock/main.c Normal file
View File

@ -0,0 +1,357 @@
/******************************************************************************
*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
** Copyright (C) 2004-2005 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.
**
*******************************************************************************
******************************************************************************/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/smp_lock.h>
#include "../../lm_interface.h"
struct nolock_lockspace {
unsigned int nl_lvb_size;
};
struct lm_lockops nolock_ops;
/**
* nolock_mount - mount a nolock lockspace
* @table_name: the name of the space to mount
* @host_data: host specific data
* @cb: the callback
* @fsdata:
* @min_lvb_size:
* @flags:
* @lockstruct: the structure of crap to fill in
*
* Returns: 0 on success, -EXXX on failure
*/
static int nolock_mount(char *table_name, char *host_data,
lm_callback_t cb, lm_fsdata_t *fsdata,
unsigned int min_lvb_size, int flags,
struct lm_lockstruct *lockstruct)
{
char *c;
unsigned int jid;
struct nolock_lockspace *nl;
/* If there is a "jid=" in the hostdata, return that jid.
Otherwise, return zero. */
c = strstr(host_data, "jid=");
if (!c)
jid = 0;
else {
c += 4;
sscanf(c, "%u", &jid);
}
nl = kmalloc(sizeof(struct nolock_lockspace), GFP_KERNEL);
if (!nl)
return -ENOMEM;
memset(nl, 0, sizeof(struct nolock_lockspace));
nl->nl_lvb_size = min_lvb_size;
lockstruct->ls_jid = jid;
lockstruct->ls_first = 1;
lockstruct->ls_lvb_size = min_lvb_size;
lockstruct->ls_lockspace = (lm_lockspace_t *)nl;
lockstruct->ls_ops = &nolock_ops;
lockstruct->ls_flags = LM_LSFLAG_LOCAL;
return 0;
}
/**
* nolock_others_may_mount - unmount a lock space
* @lockspace: the lockspace to unmount
*
*/
static void nolock_others_may_mount(lm_lockspace_t *lockspace)
{
}
/**
* nolock_unmount - unmount a lock space
* @lockspace: the lockspace to unmount
*
*/
static void nolock_unmount(lm_lockspace_t *lockspace)
{
struct nolock_lockspace *nl = (struct nolock_lockspace *)lockspace;
kfree(nl);
}
/**
* nolock_withdraw - withdraw from a lock space
* @lockspace: the lockspace
*
*/
static void nolock_withdraw(lm_lockspace_t *lockspace)
{
}
/**
* nolock_get_lock - get a lm_lock_t given a descripton of the lock
* @lockspace: the lockspace the lock lives in
* @name: the name of the lock
* @lockp: return the lm_lock_t here
*
* Returns: 0 on success, -EXXX on failure
*/
static int nolock_get_lock(lm_lockspace_t *lockspace, struct lm_lockname *name,
lm_lock_t **lockp)
{
*lockp = (lm_lock_t *)lockspace;
return 0;
}
/**
* nolock_put_lock - get rid of a lock structure
* @lock: the lock to throw away
*
*/
static void nolock_put_lock(lm_lock_t *lock)
{
}
/**
* nolock_lock - acquire a lock
* @lock: the lock to manipulate
* @cur_state: the current state
* @req_state: the requested state
* @flags: modifier flags
*
* Returns: A bitmap of LM_OUT_*
*/
static unsigned int nolock_lock(lm_lock_t *lock, unsigned int cur_state,
unsigned int req_state, unsigned int flags)
{
return req_state | LM_OUT_CACHEABLE;
}
/**
* nolock_unlock - unlock a lock
* @lock: the lock to manipulate
* @cur_state: the current state
*
* Returns: 0
*/
static unsigned int nolock_unlock(lm_lock_t *lock, unsigned int cur_state)
{
return 0;
}
/**
* nolock_cancel - cancel a request on a lock
* @lock: the lock to cancel request for
*
*/
static void nolock_cancel(lm_lock_t *lock)
{
}
/**
* nolock_hold_lvb - hold on to a lock value block
* @lock: the lock the LVB is associated with
* @lvbp: return the lm_lvb_t here
*
* Returns: 0 on success, -EXXX on failure
*/
static int nolock_hold_lvb(lm_lock_t *lock, char **lvbp)
{
struct nolock_lockspace *nl = (struct nolock_lockspace *)lock;
int error = 0;
*lvbp = kmalloc(nl->nl_lvb_size, GFP_KERNEL);
if (*lvbp)
memset(*lvbp, 0, nl->nl_lvb_size);
else
error = -ENOMEM;
return error;
}
/**
* nolock_unhold_lvb - release a LVB
* @lock: the lock the LVB is associated with
* @lvb: the lock value block
*
*/
static void nolock_unhold_lvb(lm_lock_t *lock, char *lvb)
{
kfree(lvb);
}
/**
* nolock_sync_lvb - sync out the value of a lvb
* @lock: the lock the LVB is associated with
* @lvb: the lock value block
*
*/
static void nolock_sync_lvb(lm_lock_t *lock, char *lvb)
{
}
/**
* nolock_plock_get -
* @lockspace: the lockspace
* @name:
* @file:
* @fl:
*
* Returns: errno
*/
static int nolock_plock_get(lm_lockspace_t *lockspace, struct lm_lockname *name,
struct file *file, struct file_lock *fl)
{
struct file_lock *tmp;
lock_kernel();
tmp = posix_test_lock(file, fl);
fl->fl_type = F_UNLCK;
if (tmp)
memcpy(fl, tmp, sizeof(struct file_lock));
unlock_kernel();
return 0;
}
/**
* nolock_plock -
* @lockspace: the lockspace
* @name:
* @file:
* @cmd:
* @fl:
*
* Returns: errno
*/
static int nolock_plock(lm_lockspace_t *lockspace, struct lm_lockname *name,
struct file *file, int cmd, struct file_lock *fl)
{
int error;
lock_kernel();
error = posix_lock_file_wait(file, fl);
unlock_kernel();
return error;
}
/**
* nolock_punlock -
* @lockspace: the lockspace
* @name:
* @file:
* @fl:
*
* Returns: errno
*/
static int nolock_punlock(lm_lockspace_t *lockspace, struct lm_lockname *name,
struct file *file, struct file_lock *fl)
{
int error;
lock_kernel();
error = posix_lock_file_wait(file, fl);
unlock_kernel();
return error;
}
/**
* nolock_recovery_done - reset the expired locks for a given jid
* @lockspace: the lockspace
* @jid: the jid
*
*/
static void nolock_recovery_done(lm_lockspace_t *lockspace, unsigned int jid,
unsigned int message)
{
}
struct lm_lockops nolock_ops = {
.lm_proto_name = "lock_nolock",
.lm_mount = nolock_mount,
.lm_others_may_mount = nolock_others_may_mount,
.lm_unmount = nolock_unmount,
.lm_withdraw = nolock_withdraw,
.lm_get_lock = nolock_get_lock,
.lm_put_lock = nolock_put_lock,
.lm_lock = nolock_lock,
.lm_unlock = nolock_unlock,
.lm_cancel = nolock_cancel,
.lm_hold_lvb = nolock_hold_lvb,
.lm_unhold_lvb = nolock_unhold_lvb,
.lm_sync_lvb = nolock_sync_lvb,
.lm_plock_get = nolock_plock_get,
.lm_plock = nolock_plock,
.lm_punlock = nolock_punlock,
.lm_recovery_done = nolock_recovery_done,
.lm_owner = THIS_MODULE,
};
/**
* init_nolock - Initialize the nolock module
*
* Returns: 0 on success, -EXXX on failure
*/
int __init init_nolock(void)
{
int error;
error = lm_register_proto(&nolock_ops);
if (error) {
printk("lock_nolock: can't register protocol: %d\n", error);
return error;
}
printk("Lock_Nolock (built %s %s) installed\n", __DATE__, __TIME__);
return 0;
}
/**
* exit_nolock - cleanup the nolock module
*
*/
void __exit exit_nolock(void)
{
lm_unregister_proto(&nolock_ops);
}
module_init(init_nolock);
module_exit(exit_nolock);
MODULE_DESCRIPTION("GFS Nolock Locking Module");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");