diff options
| author | Tejun Heo <tj@kernel.org> | 2008-11-26 12:03:55 +0100 |
|---|---|---|
| committer | Miklos Szeredi <miklos@szeredi.hu> | 2008-11-26 12:03:55 +0100 |
| commit | 95668a69a4bb862063c4d28a746e55107dee7b98 (patch) | |
| tree | 0679e0f43274648bad70e694a9efb8bcfed55adc /fs/fuse/dev.c | |
| parent | 8599396b5062bf6bd2a0b433503849e2322df1c2 (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.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index ffd670bb8c8c..6176e444c76e 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; } |