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authorLatchesar Ionkov <lucho@ionkov.net>2006-01-08 01:04:58 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 20:14:05 -0800
commit3cf6429a26da5c4d7b795e6d0f8f56ed2e4fdfc0 (patch)
treea8d856763fd9a0536519634c93ab92da684107fa /fs/9p/trans_fd.c
parentf5ef3c105bee3a52486d7b55cef3330fcde9bca6 (diff)
[PATCH] v9fs: new multiplexer implementation
New multiplexer implementation. Decreases the number of kernel threads required. Better handling when the user process receives a signal. Signed-off-by: Latchesar Ionkov <lucho@ionkov.net> Cc: Eric Van Hensbergen <ericvh@ericvh.myip.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/9p/trans_fd.c')
-rw-r--r--fs/9p/trans_fd.c49
1 files changed, 46 insertions, 3 deletions
diff --git a/fs/9p/trans_fd.c b/fs/9p/trans_fd.c
index b7ffb9859588..1a28ef97a3d1 100644
--- a/fs/9p/trans_fd.c
+++ b/fs/9p/trans_fd.c
@@ -3,6 +3,7 @@
*
* File Descriptor Transport Layer
*
+ * Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
* Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
@@ -106,9 +107,6 @@ v9fs_fd_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
return -ENOPROTOOPT;
}
- sema_init(&trans->writelock, 1);
- sema_init(&trans->readlock, 1);
-
ts = kmalloc(sizeof(struct v9fs_trans_fd), GFP_KERNEL);
if (!ts)
@@ -163,10 +161,55 @@ static void v9fs_fd_close(struct v9fs_transport *trans)
kfree(ts);
}
+static unsigned int
+v9fs_fd_poll(struct v9fs_transport *trans, struct poll_table_struct *pt)
+{
+ int ret, n;
+ struct v9fs_trans_fd *ts;
+ mm_segment_t oldfs;
+
+ if (!trans)
+ return -EIO;
+
+ ts = trans->priv;
+ if (trans->status != Connected || !ts)
+ return -EIO;
+
+ oldfs = get_fs();
+ set_fs(get_ds());
+
+ if (!ts->in_file->f_op || !ts->in_file->f_op->poll) {
+ ret = -EIO;
+ goto end;
+ }
+
+ ret = ts->in_file->f_op->poll(ts->in_file, pt);
+
+ if (ts->out_file != ts->in_file) {
+ if (!ts->out_file->f_op || !ts->out_file->f_op->poll) {
+ ret = -EIO;
+ goto end;
+ }
+
+ n = ts->out_file->f_op->poll(ts->out_file, pt);
+
+ ret &= ~POLLOUT;
+ n &= ~POLLIN;
+
+ ret |= n;
+ }
+
+end:
+ set_fs(oldfs);
+ return ret;
+}
+
+
struct v9fs_transport v9fs_trans_fd = {
.init = v9fs_fd_init,
.write = v9fs_fd_send,
.read = v9fs_fd_recv,
.close = v9fs_fd_close,
+ .poll = v9fs_fd_poll,
};