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[IB/uverbs]: Add O_ASYNC support

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Add support for O_ASYNC notifications on userspace verbs
completion and asynchronous event file descriptors.

Signed-off-by: Gleb Natapov <glebn@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Gleb Natapov 2005-07-27 14:40:00 -07:00 committed by Roland Dreier
parent 42b1806d5c
commit abdf119b4d
2 changed files with 14 additions and 1 deletions
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1
drivers/infiniband/core/uverbs.h
View file

@ -61,6 +61,7 @@ struct ib_uverbs_event_file {
int fd;
int is_async;
wait_queue_head_t poll_wait;
struct fasync_struct *async_queue;
struct list_head event_list;
};

14
drivers/infiniband/core/uverbs_main.c
View file

@ -257,11 +257,19 @@ static void ib_uverbs_event_release(struct ib_uverbs_event_file *file)
spin_unlock_irq(&file->lock);
}
static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
{
struct ib_uverbs_event_file *file = filp->private_data;
return fasync_helper(fd, filp, on, &file->async_queue);
}
static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
{
struct ib_uverbs_event_file *file = filp->private_data;
ib_uverbs_event_release(file);
ib_uverbs_event_fasync(-1, filp, 0);
kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
return 0;
@ -276,7 +284,8 @@ static struct file_operations uverbs_event_fops = {
*/
.read = ib_uverbs_event_read,
.poll = ib_uverbs_event_poll,
.release = ib_uverbs_event_close
.release = ib_uverbs_event_close,
.fasync = ib_uverbs_event_fasync
};
void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
@ -296,6 +305,7 @@ void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
spin_unlock_irqrestore(&file->comp_file[0].lock, flags);
wake_up_interruptible(&file->comp_file[0].poll_wait);
kill_fasync(&file->comp_file[0].async_queue, SIGIO, POLL_IN);
}
static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
@ -316,6 +326,7 @@ static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
spin_unlock_irqrestore(&file->async_file.lock, flags);
wake_up_interruptible(&file->async_file.poll_wait);
kill_fasync(&file->async_file.async_queue, SIGIO, POLL_IN);
}
void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
@ -350,6 +361,7 @@ static int ib_uverbs_event_init(struct ib_uverbs_event_file *file,
INIT_LIST_HEAD(&file->event_list);
init_waitqueue_head(&file->poll_wait);
file->uverbs_file = uverbs_file;
file->async_queue = NULL;
file->fd = get_unused_fd();
if (file->fd < 0)