fuse: implement poll support

[linux-2.6-omap-h63xx.git] / fs / fuse / fuse_i.h

diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 86f0133038289e9ae4bf08cb9caabf7d7ff22413..986fbd4c1ff5893a30ad3afd32b887e167569751 100644 (file)
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -19,6 +19,8 @@
 #include <linux/backing-dev.h>
 #include <linux/mutex.h>
 #include <linux/rwsem.h>
+#include <linux/rbtree.h>
+#include <linux/poll.h>
 
 /** Max number of pages that can be used in a single read request */
 #define FUSE_MAX_PAGES_PER_REQ 32
@@ -111,6 +113,12 @@ struct fuse_file {
 
        /** Entry on inode's write_files list */
        struct list_head write_entry;
+
+       /** RB node to be linked on fuse_conn->polled_files */
+       struct rb_node polled_node;
+
+       /** Wait queue head for poll */
+       wait_queue_head_t poll_wait;
 };
 
 /** One input argument of a request */
@@ -328,6 +336,9 @@ struct fuse_conn {
        /** The next unique kernel file handle */
        u64 khctr;
 
+       /** rbtree of fuse_files waiting for poll events indexed by ph */
+       struct rb_root polled_files;
+
        /** Number of requests currently in the background */
        unsigned num_background;
 
@@ -416,6 +427,9 @@ struct fuse_conn {
        /** Is bmap not implemented by fs? */
        unsigned no_bmap:1;
 
+       /** Is poll not implemented by fs? */
+       unsigned no_poll:1;
+
        /** Do multi-page cached writes */
        unsigned big_writes:1;
 
@@ -524,6 +538,12 @@ int fuse_release_common(struct inode *inode, struct file *file, int isdir);
 int fuse_fsync_common(struct file *file, struct dentry *de, int datasync,
                      int isdir);
 
+/**
+ * Notify poll wakeup
+ */
+int fuse_notify_poll_wakeup(struct fuse_conn *fc,
+                           struct fuse_notify_poll_wakeup_out *outarg);
+
 /**
  * Initialize file operations on a regular file
  */