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NLM: Simplify client locks 

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2006-03-20 13:44:44 -05:00
parent d72b7a6b26
commit 3a649b8846
3 changed files with 35 additions and 54 deletions
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43
fs/lockd/clntlock.c
View File

@ -44,32 +44,25 @@ static LIST_HEAD(nlm_blocked);
/*
* Queue up a lock for blocking so that the GRANTED request can see it
*/
int nlmclnt_prepare_block(struct nlm_rqst *req, struct nlm_host *host, struct file_lock *fl)
struct nlm_wait *nlmclnt_prepare_block(struct nlm_host *host, struct file_lock *fl)
{
struct nlm_wait *block;
BUG_ON(req->a_block != NULL);
block = kmalloc(sizeof(*block), GFP_KERNEL);
if (block == NULL)
return -ENOMEM;
block->b_host = host;
block->b_lock = fl;
init_waitqueue_head(&block->b_wait);
block->b_status = NLM_LCK_BLOCKED;
list_add(&block->b_list, &nlm_blocked);
req->a_block = block;
return 0;
if (block != NULL) {
block->b_host = host;
block->b_lock = fl;
init_waitqueue_head(&block->b_wait);
block->b_status = NLM_LCK_BLOCKED;
list_add(&block->b_list, &nlm_blocked);
}
return block;
}
void nlmclnt_finish_block(struct nlm_rqst *req)
void nlmclnt_finish_block(struct nlm_wait *block)
{
struct nlm_wait *block = req->a_block;
if (block == NULL)
return;
req->a_block = NULL;
list_del(&block->b_list);
kfree(block);
}
@ -77,15 +70,14 @@ void nlmclnt_finish_block(struct nlm_rqst *req)
/*
* Block on a lock
*/
long nlmclnt_block(struct nlm_rqst *req, long timeout)
int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout)
{
struct nlm_wait *block = req->a_block;
long ret;
/* A borken server might ask us to block even if we didn't
* request it. Just say no!
*/
if (!req->a_args.block)
if (block == NULL)
return -EAGAIN;
/* Go to sleep waiting for GRANT callback. Some servers seem
@ -99,13 +91,10 @@ long nlmclnt_block(struct nlm_rqst *req, long timeout)
ret = wait_event_interruptible_timeout(block->b_wait,
block->b_status != NLM_LCK_BLOCKED,
timeout);
if (block->b_status != NLM_LCK_BLOCKED) {
req->a_res.status = block->b_status;
block->b_status = NLM_LCK_BLOCKED;
}
return ret;
if (ret < 0)
return -ERESTARTSYS;
req->a_res.status = block->b_status;
return 0;
}
/*

39
fs/lockd/clntproc.c
View File

@ -136,15 +136,14 @@ static void nlmclnt_setlockargs(struct nlm_rqst *req, struct file_lock *fl)
(unsigned int)fl->fl_u.nfs_fl.owner->pid,
system_utsname.nodename);
lock->svid = fl->fl_u.nfs_fl.owner->pid;
locks_copy_lock(&lock->fl, fl);
lock->fl.fl_start = fl->fl_start;
lock->fl.fl_end = fl->fl_end;
lock->fl.fl_type = fl->fl_type;
}
static void nlmclnt_release_lockargs(struct nlm_rqst *req)
{
struct file_lock *fl = &req->a_args.lock.fl;
if (fl->fl_ops && fl->fl_ops->fl_release_private)
fl->fl_ops->fl_release_private(fl);
BUG_ON(req->a_args.lock.fl.fl_ops != NULL);
}
/*
@ -455,7 +454,6 @@ static void nlmclnt_locks_release_private(struct file_lock *fl)
{
list_del(&fl->fl_u.nfs_fl.list);
nlm_put_lockowner(fl->fl_u.nfs_fl.owner);
fl->fl_ops = NULL;
}
static struct file_lock_operations nlmclnt_lock_ops = {
@ -515,41 +513,36 @@ nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl)
{
struct nlm_host *host = req->a_host;
struct nlm_res *resp = &req->a_res;
long timeout;
int status;
struct nlm_wait *block = NULL;
int status = -ENOLCK;
if (!host->h_monitored && nsm_monitor(host) < 0) {
printk(KERN_NOTICE "lockd: failed to monitor %s\n",
host->h_name);
status = -ENOLCK;
goto out;
}
if (req->a_args.block) {
status = nlmclnt_prepare_block(req, host, fl);
if (status < 0)
goto out;
}
block = nlmclnt_prepare_block(host, fl);
for(;;) {
status = nlmclnt_call(req, NLMPROC_LOCK);
if (status < 0)
goto out_unblock;
if (resp->status != NLM_LCK_BLOCKED)
if (!req->a_args.block)
break;
/* Wait on an NLM blocking lock */
timeout = nlmclnt_block(req, NLMCLNT_POLL_TIMEOUT);
/* Did a reclaimer thread notify us of a server reboot? */
if (resp->status == NLM_LCK_DENIED_GRACE_PERIOD)
continue;
if (resp->status != NLM_LCK_BLOCKED)
break;
if (timeout >= 0)
continue;
/* We were interrupted. Send a CANCEL request to the server
/* Wait on an NLM blocking lock */
status = nlmclnt_block(block, req, NLMCLNT_POLL_TIMEOUT);
/* if we were interrupted. Send a CANCEL request to the server
* and exit
*/
status = (int)timeout;
goto out_unblock;
if (status < 0)
goto out_unblock;
if (resp->status != NLM_LCK_BLOCKED)
break;
}
if (resp->status == NLM_LCK_GRANTED) {
@ -560,7 +553,7 @@ nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl)
}
status = nlm_stat_to_errno(resp->status);
out_unblock:
nlmclnt_finish_block(req);
nlmclnt_finish_block(block);
/* Cancel the blocked request if it is still pending */
if (resp->status == NLM_LCK_BLOCKED)
nlmclnt_cancel(host, req->a_args.block, fl);

7
include/linux/lockd/lockd.h
View File

@ -86,7 +86,6 @@ struct nlm_rqst {
struct nlm_host * a_host; /* host handle */
struct nlm_args a_args; /* arguments */
struct nlm_res a_res; /* result */
struct nlm_wait * a_block;
unsigned int a_retries; /* Retry count */
char a_owner[NLMCLNT_OHSIZE];
};
@ -149,9 +148,9 @@ extern unsigned long nlmsvc_timeout;
* Lockd client functions
*/
struct nlm_rqst * nlmclnt_alloc_call(void);
int nlmclnt_prepare_block(struct nlm_rqst *req, struct nlm_host *host, struct file_lock *fl);
void nlmclnt_finish_block(struct nlm_rqst *req);
long nlmclnt_block(struct nlm_rqst *req, long timeout);
struct nlm_wait * nlmclnt_prepare_block(struct nlm_host *host, struct file_lock *fl);
void nlmclnt_finish_block(struct nlm_wait *block);
int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout);
u32 nlmclnt_grant(const struct sockaddr_in *addr, const struct nlm_lock *);
void nlmclnt_recovery(struct nlm_host *, u32);
int nlmclnt_reclaim(struct nlm_host *, struct file_lock *);