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authorTejun Heo <tj@kernel.org>2008-11-26 12:03:55 +0100
committerMiklos Szeredi <miklos@szeredi.hu>2008-11-26 12:03:55 +0100
commit95668a69a4bb862063c4d28a746e55107dee7b98 (patch)
tree0679e0f43274648bad70e694a9efb8bcfed55adc /fs/fuse/dev.c
parent8599396b5062bf6bd2a0b433503849e2322df1c2 (diff)
fuse: implement poll support
Implement poll support. Polled files are indexed using kh in a RB tree rooted at fuse_conn->polled_files. Client should send FUSE_NOTIFY_POLL notification once after processing FUSE_POLL which has FUSE_POLL_SCHEDULE_NOTIFY set. Sending notification unconditionally after the latest poll or everytime file content might have changed is inefficient but won't cause malfunction. fuse_file_poll() can sleep and requires patches from the following thread which allows f_op->poll() to sleep. http://thread.gmane.org/gmane.linux.kernel/726176 Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs/fuse/dev.c')
-rw-r--r--fs/fuse/dev.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index ffd670bb8c8..6176e444c76 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -816,10 +816,29 @@ static ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov,
return err;
}
+static int fuse_notify_poll(struct fuse_conn *fc, unsigned int size,
+ struct fuse_copy_state *cs)
+{
+ struct fuse_notify_poll_wakeup_out outarg;
+ int err;
+
+ if (size != sizeof(outarg))
+ return -EINVAL;
+
+ err = fuse_copy_one(cs, &outarg, sizeof(outarg));
+ if (err)
+ return err;
+
+ return fuse_notify_poll_wakeup(fc, &outarg);
+}
+
static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,
unsigned int size, struct fuse_copy_state *cs)
{
switch (code) {
+ case FUSE_NOTIFY_POLL:
+ return fuse_notify_poll(fc, size, cs);
+
default:
return -EINVAL;
}