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Message-Id: <11659069891772@2ka.mipt.ru> Date: Tue, 12 Dec 2006 10:03:09 +0300 From: Evgeniy Polyakov <johnpol@....mipt.ru> To: Evgeniy Polyakov <johnpol@....mipt.ru> Cc: David Miller <davem@...emloft.net>, Ulrich Drepper <drepper@...hat.com>, Andrew Morton <akpm@...l.org>, Evgeniy Polyakov <johnpol@....mipt.ru>, netdev <netdev@...r.kernel.org>, Zach Brown <zach.brown@...cle.com>, Christoph Hellwig <hch@...radead.org>, Chase Venters <chase.venters@...entec.com>, Johann Borck <johann.borck@...sedata.com>, linux-kernel@...r.kernel.org, Jeff Garzik <jeff@...zik.org> Subject: [take27 6/8] kevent: Pipe notifications. Pipe notifications. diff --git a/fs/pipe.c b/fs/pipe.c index f3b6f71..aeaee9c 100644 --- a/fs/pipe.c +++ b/fs/pipe.c @@ -16,6 +16,7 @@ #include <linux/uio.h> #include <linux/highmem.h> #include <linux/pagemap.h> +#include <linux/kevent.h> #include <asm/uaccess.h> #include <asm/ioctls.h> @@ -312,6 +313,7 @@ redo: break; } if (do_wakeup) { + kevent_pipe_notify(inode, KEVENT_SOCKET_SEND); wake_up_interruptible_sync(&pipe->wait); kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT); } @@ -321,6 +323,7 @@ redo: /* Signal writers asynchronously that there is more room. */ if (do_wakeup) { + kevent_pipe_notify(inode, KEVENT_SOCKET_SEND); wake_up_interruptible(&pipe->wait); kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT); } @@ -490,6 +493,7 @@ redo2: break; } if (do_wakeup) { + kevent_pipe_notify(inode, KEVENT_SOCKET_RECV); wake_up_interruptible_sync(&pipe->wait); kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); do_wakeup = 0; @@ -501,6 +505,7 @@ redo2: out: mutex_unlock(&inode->i_mutex); if (do_wakeup) { + kevent_pipe_notify(inode, KEVENT_SOCKET_RECV); wake_up_interruptible(&pipe->wait); kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); } @@ -605,6 +610,7 @@ pipe_release(struct inode *inode, int decr, int decw) free_pipe_info(inode); } else { wake_up_interruptible(&pipe->wait); + kevent_pipe_notify(inode, KEVENT_SOCKET_SEND|KEVENT_SOCKET_RECV); kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT); } diff --git a/kernel/kevent/kevent_pipe.c b/kernel/kevent/kevent_pipe.c new file mode 100644 index 0000000..d529fa9 --- /dev/null +++ b/kernel/kevent/kevent_pipe.c @@ -0,0 +1,121 @@ +/* + * kevent_pipe.c + * + * 2006 Copyright (c) Evgeniy Polyakov <johnpol@....mipt.ru> + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/file.h> +#include <linux/fs.h> +#include <linux/kevent.h> +#include <linux/pipe_fs_i.h> + +static int kevent_pipe_callback(struct kevent *k) +{ + struct inode *inode = k->st->origin; + struct pipe_inode_info *pipe = inode->i_pipe; + int nrbufs = pipe->nrbufs; + + if (k->event.event & KEVENT_SOCKET_RECV && nrbufs > 0) { + if (!pipe->writers) + return -1; + return 1; + } + + if (k->event.event & KEVENT_SOCKET_SEND && nrbufs < PIPE_BUFFERS) { + if (!pipe->readers) + return -1; + return 1; + } + + return 0; +} + +int kevent_pipe_enqueue(struct kevent *k) +{ + struct file *pipe; + int err = -EBADF; + struct inode *inode; + + pipe = fget(k->event.id.raw[0]); + if (!pipe) + goto err_out_exit; + + inode = igrab(pipe->f_dentry->d_inode); + if (!inode) + goto err_out_fput; + + err = -EINVAL; + if (!S_ISFIFO(inode->i_mode)) + goto err_out_iput; + + err = kevent_storage_enqueue(&inode->st, k); + if (err) + goto err_out_iput; + + if (k->event.req_flags & KEVENT_REQ_ALWAYS_QUEUE) { + kevent_requeue(k); + err = 0; + } else { + err = k->callbacks.callback(k); + if (err) + goto err_out_dequeue; + } + + fput(pipe); + + return err; + +err_out_dequeue: + kevent_storage_dequeue(k->st, k); +err_out_iput: + iput(inode); +err_out_fput: + fput(pipe); +err_out_exit: + return err; +} + +int kevent_pipe_dequeue(struct kevent *k) +{ + struct inode *inode = k->st->origin; + + kevent_storage_dequeue(k->st, k); + iput(inode); + + return 0; +} + +void kevent_pipe_notify(struct inode *inode, u32 event) +{ + kevent_storage_ready(&inode->st, NULL, event); +} + +static int __init kevent_init_pipe(void) +{ + struct kevent_callbacks sc = { + .callback = &kevent_pipe_callback, + .enqueue = &kevent_pipe_enqueue, + .dequeue = &kevent_pipe_dequeue}; + + return kevent_add_callbacks(&sc, KEVENT_PIPE); +} +module_init(kevent_init_pipe); - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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