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lockd: blocks should hold a reference to the nlm_file 

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2006-03-20 13:44:47 -05:00
parent 51581f3bf9
commit d9f6eb75d4
1 changed files with 46 additions and 35 deletions
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81
fs/lockd/svclock.c
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@ -103,11 +103,10 @@ nlmsvc_remove_block(struct nlm_block *block)
}
/*
* Find a block for a given lock and optionally remove it from
* the list.
* Find a block for a given lock
*/
static struct nlm_block *
nlmsvc_lookup_block(struct nlm_file *file, struct nlm_lock *lock, int remove)
nlmsvc_lookup_block(struct nlm_file *file, struct nlm_lock *lock)
{
struct nlm_block **head, *block;
struct file_lock *fl;
@ -124,10 +123,6 @@ nlmsvc_lookup_block(struct nlm_file *file, struct nlm_lock *lock, int remove)
(long long)fl->fl_end, fl->fl_type,
nlmdbg_cookie2a(&block->b_call->a_args.cookie));
if (block->b_file == file && nlm_compare_locks(fl, &lock->fl)) {
if (remove) {
*head = block->b_next;
block->b_queued = 0;
}
kref_get(&block->b_count);
return block;
}
@ -213,6 +208,7 @@ nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_file *file,
block->b_daemon = rqstp->rq_server;
block->b_host = host;
block->b_file = file;
file->f_count++;
/* Add to file's list of blocks */
block->b_fnext = file->f_blocks;
@ -257,6 +253,7 @@ static void nlmsvc_free_block(struct kref *kref)
dprintk("lockd: freeing block %p...\n", block);
down(&file->f_sema);
/* Remove block from file's list of blocks */
for (bp = &file->f_blocks; *bp; bp = &(*bp)->b_fnext) {
if (*bp == block) {
@ -264,9 +261,11 @@ static void nlmsvc_free_block(struct kref *kref)
break;
}
}
up(&file->f_sema);
nlmsvc_freegrantargs(block->b_call);
nlm_release_call(block->b_call);
nlm_release_file(block->b_file);
kfree(block);
}
@ -276,6 +275,36 @@ static void nlmsvc_release_block(struct nlm_block *block)
kref_put(&block->b_count, nlmsvc_free_block);
}
static void nlmsvc_act_mark(struct nlm_host *host, struct nlm_file *file)
{
struct nlm_block *block;
down(&file->f_sema);
for (block = file->f_blocks; block != NULL; block = block->b_fnext)
block->b_host->h_inuse = 1;
up(&file->f_sema);
}
static void nlmsvc_act_unlock(struct nlm_host *host, struct nlm_file *file)
{
struct nlm_block *block;
restart:
down(&file->f_sema);
for (block = file->f_blocks; block != NULL; block = block->b_fnext) {
if (host != NULL && host != block->b_host)
continue;
if (!block->b_queued)
continue;
kref_get(&block->b_count);
up(&file->f_sema);
nlmsvc_unlink_block(block);
nlmsvc_release_block(block);
goto restart;
}
up(&file->f_sema);
}
/*
* Loop over all blocks and perform the action specified.
* (NLM_ACT_CHECK handled by nlmsvc_inspect_file).
@ -283,20 +312,10 @@ static void nlmsvc_release_block(struct nlm_block *block)
int
nlmsvc_traverse_blocks(struct nlm_host *host, struct nlm_file *file, int action)
{
struct nlm_block *block, *next;
/* XXX: Will everything get cleaned up if we don't unlock here? */
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_unlink_block(block);
}
}
up(&file->f_sema);
if (action == NLM_ACT_MARK)
nlmsvc_act_mark(host, file);
else
nlmsvc_act_unlock(host, file);
return 0;
}
@ -358,7 +377,7 @@ again:
/* 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);
block = nlmsvc_lookup_block(file, lock);
if (block == NULL) {
if (newblock != NULL)
lock = &newblock->b_call->a_args.lock;
@ -491,11 +510,12 @@ nlmsvc_cancel_blocked(struct nlm_file *file, struct nlm_lock *lock)
(long long)lock->fl.fl_end);
down(&file->f_sema);
if ((block = nlmsvc_lookup_block(file, lock, 1)) != NULL) {
block = nlmsvc_lookup_block(file, lock);
up(&file->f_sema);
if (block != NULL) {
status = nlmsvc_unlink_block(block);
nlmsvc_release_block(block);
}
up(&file->f_sema);
return status ? nlm_lck_denied : nlm_granted;
}
@ -553,9 +573,6 @@ nlmsvc_grant_blocked(struct nlm_block *block)
dprintk("lockd: grant blocked lock %p\n", block);
/* First thing is lock the file */
down(&file->f_sema);
/* Unlink block request from list */
nlmsvc_unlink_block(block);
@ -578,12 +595,12 @@ nlmsvc_grant_blocked(struct nlm_block *block)
case -EAGAIN:
dprintk("lockd: lock still blocked\n");
nlmsvc_insert_block(block, NLM_NEVER);
goto out_unlock;
return;
default:
printk(KERN_WARNING "lockd: unexpected error %d in %s!\n",
-error, __FUNCTION__);
nlmsvc_insert_block(block, 10 * HZ);
goto out_unlock;
return;
}
callback:
@ -599,8 +616,6 @@ callback:
if (nlm_async_call(block->b_call, NLMPROC_GRANTED_MSG,
&nlmsvc_grant_ops) < 0)
nlmsvc_release_block(block);
out_unlock:
up(&file->f_sema);
}
/*
@ -665,8 +680,6 @@ nlmsvc_grant_reply(struct svc_rqst *rqstp, struct nlm_cookie *cookie, u32 status
return;
file = block->b_file;
file->f_count++;
down(&file->f_sema);
if (block) {
if (status == NLM_LCK_DENIED_GRACE_PERIOD) {
/* Try again in a couple of seconds */
@ -677,8 +690,6 @@ nlmsvc_grant_reply(struct svc_rqst *rqstp, struct nlm_cookie *cookie, u32 status
nlmsvc_unlink_block(block);
}
}
up(&file->f_sema);
nlm_release_file(file);
nlmsvc_release_block(block);
}