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authorTejun Heo <tj@kernel.org>2008-11-26 14:03:55 +0300
committerMiklos Szeredi <miklos@szeredi.hu>2008-11-26 14:03:55 +0300
commit95668a69a4bb862063c4d28a746e55107dee7b98 (patch)
tree0679e0f43274648bad70e694a9efb8bcfed55adc /include/linux/fuse.h
parent8599396b5062bf6bd2a0b433503849e2322df1c2 (diff)
downloadlinux-95668a69a4bb862063c4d28a746e55107dee7b98.tar.xz
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 'include/linux/fuse.h')
-rw-r--r--include/linux/fuse.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index abde9949e2c0..5650cf033e73 100644
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -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;