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/fuse_i.h | |
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/fuse_i.h')
-rw-r--r-- | fs/fuse/fuse_i.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index 86f01330382..986fbd4c1ff 100644 --- 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; @@ -525,6 +539,12 @@ 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 */ void fuse_init_file_inode(struct inode *inode); |