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fuse: implement poll support

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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>
This commit is contained in:
Tejun Heo 2008-11-26 12:03:55 +01:00 • committed by Miklos Szeredi
parent 8599396b50
commit 95668a69a4
5 changed files with 197 additions and 0 deletions
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25
include/linux/fuse.h
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@ -163,6 +163,13 @@ struct fuse_file_lock {
#define FUSE_IOCTL_MAX_IOV 256
/**
* Poll flags
*
* FUSE_POLL_SCHEDULE_NOTIFY: request poll notify
*/
#define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
enum fuse_opcode {
FUSE_LOOKUP = 1,
FUSE_FORGET = 2, /* no reply */
@ -201,9 +208,11 @@ enum fuse_opcode {
FUSE_BMAP = 37,
FUSE_DESTROY = 38,
FUSE_IOCTL = 39,
FUSE_POLL = 40,
};
enum fuse_notify_code {
FUSE_NOTIFY_POLL = 1,
FUSE_NOTIFY_CODE_MAX,
};
@ -421,6 +430,22 @@ struct fuse_ioctl_out {
__u32 out_iovs;
};
struct fuse_poll_in {
__u64 fh;
__u64 kh;
__u32 flags;
__u32 padding;
};
struct fuse_poll_out {
__u32 revents;
__u32 padding;
};
struct fuse_notify_poll_wakeup_out {
__u64 kh;
};
struct fuse_in_header {
__u32 len;
__u32 opcode;