diff options
Diffstat (limited to 'fs/dlm/user.c')
-rw-r--r-- | fs/dlm/user.c | 74 |
1 files changed, 43 insertions, 31 deletions
diff --git a/fs/dlm/user.c b/fs/dlm/user.c index c5d27bccc3dc..35129505ddda 100644 --- a/fs/dlm/user.c +++ b/fs/dlm/user.c @@ -25,6 +25,7 @@ #include "user.h" #include "ast.h" #include "config.h" +#include "memory.h" static const char name_prefix[] = "dlm"; static const struct file_operations device_fops; @@ -175,7 +176,7 @@ static int lkb_is_endoflife(int mode, int status) being removed and then remove that lkb from the orphans list and free it */ void dlm_user_add_ast(struct dlm_lkb *lkb, uint32_t flags, int mode, - int status, uint32_t sbflags, uint64_t seq) + int status, uint32_t sbflags) { struct dlm_ls *ls; struct dlm_user_args *ua; @@ -209,16 +210,22 @@ void dlm_user_add_ast(struct dlm_lkb *lkb, uint32_t flags, int mode, spin_lock(&proc->asts_spin); - rv = dlm_add_lkb_callback(lkb, flags, mode, status, sbflags, seq); - if (rv < 0) { + rv = dlm_enqueue_lkb_callback(lkb, flags, mode, status, sbflags); + switch (rv) { + case DLM_ENQUEUE_CALLBACK_FAILURE: spin_unlock(&proc->asts_spin); + WARN_ON_ONCE(1); goto out; - } - - if (list_empty(&lkb->lkb_cb_list)) { + case DLM_ENQUEUE_CALLBACK_NEED_SCHED: kref_get(&lkb->lkb_ref); list_add_tail(&lkb->lkb_cb_list, &proc->asts); wake_up_interruptible(&proc->wait); + break; + case DLM_ENQUEUE_CALLBACK_SUCCESS: + break; + default: + WARN_ON_ONCE(1); + break; } spin_unlock(&proc->asts_spin); @@ -800,8 +807,8 @@ static ssize_t device_read(struct file *file, char __user *buf, size_t count, struct dlm_user_proc *proc = file->private_data; struct dlm_lkb *lkb; DECLARE_WAITQUEUE(wait, current); - struct dlm_callback cb; - int rv, resid, copy_lvb = 0; + struct dlm_callback *cb; + int rv, copy_lvb = 0; int old_mode, new_mode; if (count == sizeof(struct dlm_device_version)) { @@ -857,53 +864,58 @@ static ssize_t device_read(struct file *file, char __user *buf, size_t count, without removing lkb_cb_list; so empty lkb_cb_list is always consistent with empty lkb_callbacks */ - lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_cb_list); + lkb = list_first_entry(&proc->asts, struct dlm_lkb, lkb_cb_list); /* rem_lkb_callback sets a new lkb_last_cast */ - old_mode = lkb->lkb_last_cast.mode; + old_mode = lkb->lkb_last_cast->mode; - rv = dlm_rem_lkb_callback(lkb->lkb_resource->res_ls, lkb, &cb, &resid); - if (rv < 0) { + rv = dlm_dequeue_lkb_callback(lkb, &cb); + switch (rv) { + case DLM_DEQUEUE_CALLBACK_EMPTY: /* this shouldn't happen; lkb should have been removed from - list when resid was zero */ + * list when last item was dequeued + */ log_print("dlm_rem_lkb_callback empty %x", lkb->lkb_id); list_del_init(&lkb->lkb_cb_list); spin_unlock(&proc->asts_spin); /* removes ref for proc->asts, may cause lkb to be freed */ dlm_put_lkb(lkb); + WARN_ON_ONCE(1); goto try_another; - } - if (!resid) + case DLM_DEQUEUE_CALLBACK_LAST: list_del_init(&lkb->lkb_cb_list); - spin_unlock(&proc->asts_spin); - - if (cb.flags & DLM_CB_SKIP) { - /* removes ref for proc->asts, may cause lkb to be freed */ - if (!resid) - dlm_put_lkb(lkb); - goto try_another; + lkb->lkb_flags &= ~DLM_IFL_CB_PENDING; + break; + case DLM_DEQUEUE_CALLBACK_SUCCESS: + break; + default: + WARN_ON_ONCE(1); + break; } + spin_unlock(&proc->asts_spin); - if (cb.flags & DLM_CB_BAST) { - trace_dlm_bast(lkb->lkb_resource->res_ls, lkb, cb.mode); - } else if (cb.flags & DLM_CB_CAST) { - new_mode = cb.mode; + if (cb->flags & DLM_CB_BAST) { + trace_dlm_bast(lkb->lkb_resource->res_ls, lkb, cb->mode); + } else if (cb->flags & DLM_CB_CAST) { + new_mode = cb->mode; - if (!cb.sb_status && lkb->lkb_lksb->sb_lvbptr && + if (!cb->sb_status && lkb->lkb_lksb->sb_lvbptr && dlm_lvb_operations[old_mode + 1][new_mode + 1]) copy_lvb = 1; - lkb->lkb_lksb->sb_status = cb.sb_status; - lkb->lkb_lksb->sb_flags = cb.sb_flags; + lkb->lkb_lksb->sb_status = cb->sb_status; + lkb->lkb_lksb->sb_flags = cb->sb_flags; trace_dlm_ast(lkb->lkb_resource->res_ls, lkb); } rv = copy_result_to_user(lkb->lkb_ua, test_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags), - cb.flags, cb.mode, copy_lvb, buf, count); + cb->flags, cb->mode, copy_lvb, buf, count); + + kref_put(&cb->ref, dlm_release_callback); /* removes ref for proc->asts, may cause lkb to be freed */ - if (!resid) + if (rv == DLM_DEQUEUE_CALLBACK_LAST) dlm_put_lkb(lkb); return rv; |