/*
* We received a GRANT_RES callback. Try to find the corresponding
* block.
*/
void
nlmsvc_grant_reply(struct svc_rqst *rqstp, struct nlm_cookie *cookie, u32 status)
{
struct nlm_block *block;
struct nlm_file *file;
dprintk("grant_reply: looking for cookie %x, host (%08x), s=%d \n",
*(unsigned int *)(cookie->data),
ntohl(rqstp->rq_addr.sin_addr.s_addr), status);
if (!(block = nlmsvc_find_block(cookie, &rqstp->rq_addr)))
return;
file = block->b_file;
file->f_count++;
down(&file->f_sema);
if ((block = nlmsvc_find_block(cookie,&rqstp->rq_addr)) != NULL) {
if (status == NLM_LCK_DENIED_GRACE_PERIOD) {
/* Try again in a couple of seconds */
nlmsvc_insert_block(block, 10 * HZ);
block = NULL;
} else {
/* Lock is now held by client, or has been rejected.
* In both cases, the block should be removed. */
file->f_count++;
up(&file->f_sema);
if (status == NLM_LCK_GRANTED)
nlmsvc_delete_block(block, 0);
else
nlmsvc_delete_block(block, 1);
}
}
if (!block)
up(&file->f_sema);
nlm_release_file(file);
}
/*
* We received a GRANT_RES callback. Try to find the corresponding
* block.
*/
void
nlmsvc_grant_reply(u32 cookie, u32 status)
{
struct nlm_block *block;
struct nlm_file *file;
if (!(block = nlmsvc_find_block(cookie)))
return;
file = block->b_file;
file->f_count++;
down(&file->f_sema);
if ((block = nlmsvc_find_block(cookie)) != NULL) {
if (status == NLM_LCK_DENIED_GRACE_PERIOD) {
/* Try again in a couple of seconds */
nlmsvc_insert_block(block, jiffies + 10 * HZ);
block = NULL;
} else {
/* Lock is now held by client, or has been rejected.
* In both cases, the block should be removed. */
file->f_count++;
up(&file->f_sema);
if (status == NLM_LCK_GRANTED)
nlmsvc_delete_block(block, 0);
else
nlmsvc_delete_block(block, 1);
}
}
if (!block)
up(&file->f_sema);
nlm_release_file(file);
}
/*
* Retry all blocked locks that have been notified. This is where lockd
* picks up locks that can be granted, or grant notifications that must
* be retransmitted.
*/
unsigned long
nlmsvc_retry_blocked(void)
{
struct nlm_block *block;
dprintk("nlmsvc_retry_blocked(%p, when=%ld)\n",
nlm_blocked,
nlm_blocked? nlm_blocked->b_when : 0);
while ((block = nlm_blocked)) {
if (block->b_when == NLM_NEVER)
break;
if (time_after(block->b_when,jiffies))
break;
dprintk("nlmsvc_retry_blocked(%p, when=%ld, done=%d)\n",
block, block->b_when, block->b_done);
if (block->b_done)
nlmsvc_delete_block(block, 0);
else
nlmsvc_grant_blocked(block);
}
if ((block = nlm_blocked) && block->b_when != NLM_NEVER)
return (block->b_when - jiffies);
return MAX_SCHEDULE_TIMEOUT;
}
/*
* Cancel a previously blocked request.
*
* A cancel request always overrides any grant that may currently
* be in progress.
* The calling procedure must check whether the file can be closed.
*/
u32
nlmsvc_cancel_blocked(struct nlm_file *file, struct nlm_lock *lock)
{
struct nlm_block *block;
dprintk("lockd: nlmsvc_cancel(%04x/%ld, pi=%d, %ld-%ld)\n",
file->f_file.f_dentry->d_inode->i_dev,
file->f_file.f_dentry->d_inode->i_ino,
lock->fl.fl_pid,
lock->fl.fl_start,
lock->fl.fl_end);
down(&file->f_sema);
if ((block = nlmsvc_lookup_block(file, lock, 1)) != NULL)
nlmsvc_delete_block(block, 1);
up(&file->f_sema);
return nlm_granted;
}
/*
* Loop over all blocks and perform the action specified.
* (NLM_ACT_CHECK handled by nlmsvc_inspect_file).
*/
int
nlmsvc_traverse_blocks(struct nlm_host *host, struct nlm_file *file, int action)
{
struct nlm_block *block, *next;
down(&file->f_sema);
for (block = file->f_blocks; block; block = next) {
next = block->b_fnext;
if (action == NLM_ACT_MARK)
block->b_host->h_inuse = 1;
else if (action == NLM_ACT_UNLOCK) {
if (host == NULL || host == block->b_host)
nlmsvc_delete_block(block, 1);
}
}
up(&file->f_sema);
return 0;
}
/*
* Attempt to establish a lock, and if it can't be granted, block it
* if required.
*/
u32
nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file,
struct nlm_lock *lock, int wait, u32 cookie)
{
struct file_lock *conflock;
struct nlm_block *block;
int error;
dprintk("lockd: nlmsvc_lock(%04x/%ld, ty=%d, pi=%d, %ld-%ld, bl=%d)\n",
file->f_file.f_dentry->d_inode->i_dev,
file->f_file.f_dentry->d_inode->i_ino,
lock->fl.fl_type, lock->fl.fl_pid,
lock->fl.fl_start,
lock->fl.fl_end,
wait);
/* Lock file against concurrent access */
down(&file->f_sema);
/* Get existing block (in case client is busy-waiting) */
block = nlmsvc_lookup_block(file, lock, 0);
lock->fl.fl_flags |= FL_LOCKD;
again:
if (!(conflock = posix_test_lock(&file->f_file, &lock->fl))) {
error = posix_lock_file(&file->f_file, &lock->fl, 0);
if (block)
nlmsvc_delete_block(block, 0);
up(&file->f_sema);
dprintk("lockd: posix_lock_file returned %d\n", -error);
switch(-error) {
case 0:
return nlm_granted;
case EDEADLK: /* no applicable NLM status */
case EAGAIN:
return nlm_lck_denied;
default: /* includes ENOLCK */
return nlm_lck_denied_nolocks;
}
}
if (!wait) {
up(&file->f_sema);
return nlm_lck_denied;
}
/* If we don't have a block, create and initialize it. Then
* retry because we may have slept in kmalloc. */
if (block == NULL) {
dprintk("lockd: blocking on this lock (allocating).\n");
if (!(block = nlmsvc_create_block(rqstp, file, lock, cookie)))
return nlm_lck_denied_nolocks;
goto again;
}
/* Append to list of blocked */
nlmsvc_insert_block(block, NLM_NEVER);
/* Now add block to block list of the conflicting lock */
dprintk("lockd: blocking on this lock.\n");
posix_block_lock(conflock, &block->b_call.a_args.lock.fl);
up(&file->f_sema);
return nlm_lck_blocked;
}
/*
* Attempt to establish a lock, and if it can't be granted, block it
* if required.
*/
u32
nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file,
struct nlm_lock *lock, int wait, struct nlm_cookie *cookie)
{
struct file_lock *conflock;
struct nlm_block *block, *nblock = NULL;
int error;
dprintk("lockd: nlmsvc_lock(%04x/%ld, ty=%d, pi=%d, %Ld-%Ld, bl=%d)\n",
file->f_file.f_dentry->d_inode->i_dev,
file->f_file.f_dentry->d_inode->i_ino,
lock->fl.fl_type, lock->fl.fl_pid,
(long long)lock->fl.fl_start,
(long long)lock->fl.fl_end,
wait);
/* Get existing block (in case client is busy-waiting) */
block = nlmsvc_lookup_block(file, lock, 0);
lock->fl.fl_flags |= FL_LOCKD;
again:
/* Lock file against concurrent access */
down(&file->f_sema);
if (!(conflock = posix_test_lock(&file->f_file, &lock->fl))) {
error = posix_lock_file(&file->f_file, &lock->fl, 0);
if (block)
nlmsvc_delete_block(block, 0);
up(&file->f_sema);
dprintk("lockd: posix_lock_file returned %d\n", -error);
switch(-error) {
case 0:
return nlm_granted;
case EDEADLK:
return nlm_deadlock;
case EAGAIN:
return nlm_lck_denied;
default: /* includes ENOLCK */
return nlm_lck_denied_nolocks;
}
}
if (!wait) {
up(&file->f_sema);
return nlm_lck_denied;
}
if (posix_locks_deadlock(&lock->fl, conflock)) {
if (nblock)
nlmsvc_delete_block(nblock, 0);
up(&file->f_sema);
return nlm_deadlock;
}
/* If we don't have a block, create and initialize it. Then
* retry because we may have slept in kmalloc. */
/* We have to release f_sema as nlmsvc_create_block may try to
* to claim it while doing host garbage collection */
if (block == NULL) {
up(&file->f_sema);
dprintk("lockd: blocking on this lock (allocating).\n");
if (!(block = nlmsvc_create_block(rqstp, file, lock, cookie)))
return nlm_lck_denied_nolocks;
nblock = block;
goto again;
}
/* Append to list of blocked */
nlmsvc_insert_block(block, NLM_NEVER);
if (list_empty(&block->b_call.a_args.lock.fl.fl_block)) {
/* Now add block to block list of the conflicting lock
if we haven't done so. */
dprintk("lockd: blocking on this lock.\n");
posix_block_lock(conflock, &block->b_call.a_args.lock.fl);
}
up(&file->f_sema);
return nlm_lck_blocked;
}
