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authorJeff Dike <jdike@addtoit.com>2006-04-10 22:54:52 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-04-11 06:18:48 -0700
commit385a17bfc3cb035333c8a91eddc78a6e04c4625e (patch)
tree7a9fde77c95f0e4cc86f31e8b1f5d23b6d815634 /fs/fuse/fuse_i.h
parent7025d9ad10a38dadef8b286e0092731c2d3cdc53 (diff)
downloadblackbird-op-linux-385a17bfc3cb035333c8a91eddc78a6e04c4625e.tar.gz
blackbird-op-linux-385a17bfc3cb035333c8a91eddc78a6e04c4625e.zip
[PATCH] fuse: add O_ASYNC support to FUSE device
This adds asynchronous notification to FUSE - a FUSE server can request O_ASYNC on a /dev/fuse file descriptor and receive SIGIO when there is input available. One subtlety - fuse_dev_fasync, which is called when O_ASYNC is requested, does no locking, unlink the other methods. I think it's unnecessary, as the fuse_conn.fasync list is manipulated only by fasync_helper and kill_fasync, which provide their own locking. It would also be wrong to use the fuse_lock, as it's a spin lock and fasync_helper can sleep. My one concern with this is the fuse_conn going away underneath fuse_dev_fasync - sys_fcntl takes a reference on the file struct, so this seems not to be a problem. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/fuse/fuse_i.h')
-rw-r--r--fs/fuse/fuse_i.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index a16a04fcf41e..e5cb46b78437 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -318,6 +318,9 @@ struct fuse_conn {
/** kobject */
struct kobject kobj;
+
+ /** O_ASYNC requests */
+ struct fasync_struct *fasync;
};
static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
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