1 files changed, 0 insertions, 482 deletions

diff --git a/fs/relayfs/relay.c b/fs/relayfs/relay.c
deleted file mode 100644
index abf3ceaace49..000000000000
--- a/fs/relayfs/relay.c
+++ /dev/null
@@ -1,482 +0,0 @@
-/*
- * Public API and common code for RelayFS.
- *
- * See Documentation/filesystems/relayfs.txt for an overview of relayfs.
- *
- * Copyright (C) 2002-2005 - Tom Zanussi (zanussi@us.ibm.com), IBM Corp
- * Copyright (C) 1999-2005 - Karim Yaghmour (karim@opersys.com)
- *
- * This file is released under the GPL.
- */
-
-#include <linux/errno.h>
-#include <linux/stddef.h>
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/string.h>
-#include <linux/relayfs_fs.h>
-#include "relay.h"
-#include "buffers.h"
-
-/**
- *	relay_buf_empty - boolean, is the channel buffer empty?
- *	@buf: channel buffer
- *
- *	Returns 1 if the buffer is empty, 0 otherwise.
- */
-int relay_buf_empty(struct rchan_buf *buf)
-{
-	return (buf->subbufs_produced - buf->subbufs_consumed) ? 0 : 1;
-}
-
-/**
- *	relay_buf_full - boolean, is the channel buffer full?
- *	@buf: channel buffer
- *
- *	Returns 1 if the buffer is full, 0 otherwise.
- */
-int relay_buf_full(struct rchan_buf *buf)
-{
-	size_t ready = buf->subbufs_produced - buf->subbufs_consumed;
-	return (ready >= buf->chan->n_subbufs) ? 1 : 0;
-}
-
-/*
- * High-level relayfs kernel API and associated functions.
- */
-
-/*
- * rchan_callback implementations defining default channel behavior.  Used
- * in place of corresponding NULL values in client callback struct.
- */
-
-/*
- * subbuf_start() default callback.  Does nothing.
- */
-static int subbuf_start_default_callback (struct rchan_buf *buf,
-					  void *subbuf,
-					  void *prev_subbuf,
-					  size_t prev_padding)
-{
-	if (relay_buf_full(buf))
-		return 0;
-
-	return 1;
-}
-
-/*
- * buf_mapped() default callback.  Does nothing.
- */
-static void buf_mapped_default_callback(struct rchan_buf *buf,
-					struct file *filp)
-{
-}
-
-/*
- * buf_unmapped() default callback.  Does nothing.
- */
-static void buf_unmapped_default_callback(struct rchan_buf *buf,
-					  struct file *filp)
-{
-}
-
-/*
- * create_buf_file_create() default callback.  Creates file to represent buf.
- */
-static struct dentry *create_buf_file_default_callback(const char *filename,
-						       struct dentry *parent,
-						       int mode,
-						       struct rchan_buf *buf,
-						       int *is_global)
-{
-	return relayfs_create_file(filename, parent, mode,
-				   &relay_file_operations, buf);
-}
-
-/*
- * remove_buf_file() default callback.  Removes file representing relay buffer.
- */
-static int remove_buf_file_default_callback(struct dentry *dentry)
-{
-	return relayfs_remove(dentry);
-}
-
-/* relay channel default callbacks */
-static struct rchan_callbacks default_channel_callbacks = {
-	.subbuf_start = subbuf_start_default_callback,
-	.buf_mapped = buf_mapped_default_callback,
-	.buf_unmapped = buf_unmapped_default_callback,
-	.create_buf_file = create_buf_file_default_callback,
-	.remove_buf_file = remove_buf_file_default_callback,
-};
-
-/**
- *	wakeup_readers - wake up readers waiting on a channel
- *	@private: the channel buffer
- *
- *	This is the work function used to defer reader waking.  The
- *	reason waking is deferred is that calling directly from write
- *	causes problems if you're writing from say the scheduler.
- */
-static void wakeup_readers(void *private)
-{
-	struct rchan_buf *buf = private;
-	wake_up_interruptible(&buf->read_wait);
-}
-
-/**
- *	__relay_reset - reset a channel buffer
- *	@buf: the channel buffer
- *	@init: 1 if this is a first-time initialization
- *
- *	See relay_reset for description of effect.
- */
-static inline void __relay_reset(struct rchan_buf *buf, unsigned int init)
-{
-	size_t i;
-
-	if (init) {
-		init_waitqueue_head(&buf->read_wait);
-		kref_init(&buf->kref);
-		INIT_WORK(&buf->wake_readers, NULL, NULL);
-	} else {
-		cancel_delayed_work(&buf->wake_readers);
-		flush_scheduled_work();
-	}
-
-	buf->subbufs_produced = 0;
-	buf->subbufs_consumed = 0;
-	buf->bytes_consumed = 0;
-	buf->finalized = 0;
-	buf->data = buf->start;
-	buf->offset = 0;
-
-	for (i = 0; i < buf->chan->n_subbufs; i++)
-		buf->padding[i] = 0;
-
-	buf->chan->cb->subbuf_start(buf, buf->data, NULL, 0);
-}
-
-/**
- *	relay_reset - reset the channel
- *	@chan: the channel
- *
- *	This has the effect of erasing all data from all channel buffers
- *	and restarting the channel in its initial state.  The buffers
- *	are not freed, so any mappings are still in effect.
- *
- *	NOTE: Care should be taken that the channel isn't actually
- *	being used by anything when this call is made.
- */
-void relay_reset(struct rchan *chan)
-{
-	unsigned int i;
-	struct rchan_buf *prev = NULL;
-
-	if (!chan)
-		return;
-
-	for (i = 0; i < NR_CPUS; i++) {
-		if (!chan->buf[i] || chan->buf[i] == prev)
-			break;
-		__relay_reset(chan->buf[i], 0);
-		prev = chan->buf[i];
-	}
-}
-
-/**
- *	relay_open_buf - create a new channel buffer in relayfs
- *
- *	Internal - used by relay_open().
- */
-static struct rchan_buf *relay_open_buf(struct rchan *chan,
-					const char *filename,
-					struct dentry *parent,
-					int *is_global)
-{
-	struct rchan_buf *buf;
-	struct dentry *dentry;
-
-	if (*is_global)
-		return chan->buf[0];
-
- 	buf = relay_create_buf(chan);
- 	if (!buf)
- 		return NULL;
-
-	/* Create file in fs */
- 	dentry = chan->cb->create_buf_file(filename, parent, S_IRUSR,
- 					   buf, is_global);
- 	if (!dentry) {
- 		relay_destroy_buf(buf);
-		return NULL;
- 	}
-
-	buf->dentry = dentry;
-	__relay_reset(buf, 1);
-
-	return buf;
-}
-
-/**
- *	relay_close_buf - close a channel buffer
- *	@buf: channel buffer
- *
- *	Marks the buffer finalized and restores the default callbacks.
- *	The channel buffer and channel buffer data structure are then freed
- *	automatically when the last reference is given up.
- */
-static inline void relay_close_buf(struct rchan_buf *buf)
-{
-	buf->finalized = 1;
-	buf->chan->cb = &default_channel_callbacks;
-	cancel_delayed_work(&buf->wake_readers);
-	flush_scheduled_work();
-	kref_put(&buf->kref, relay_remove_buf);
-}
-
-static inline void setup_callbacks(struct rchan *chan,
-				   struct rchan_callbacks *cb)
-{
-	if (!cb) {
-		chan->cb = &default_channel_callbacks;
-		return;
-	}
-
-	if (!cb->subbuf_start)
-		cb->subbuf_start = subbuf_start_default_callback;
-	if (!cb->buf_mapped)
-		cb->buf_mapped = buf_mapped_default_callback;
-	if (!cb->buf_unmapped)
-		cb->buf_unmapped = buf_unmapped_default_callback;
-	if (!cb->create_buf_file)
-		cb->create_buf_file = create_buf_file_default_callback;
-	if (!cb->remove_buf_file)
-		cb->remove_buf_file = remove_buf_file_default_callback;
-	chan->cb = cb;
-}
-
-/**
- *	relay_open - create a new relayfs channel
- *	@base_filename: base name of files to create
- *	@parent: dentry of parent directory, NULL for root directory
- *	@subbuf_size: size of sub-buffers
- *	@n_subbufs: number of sub-buffers
- *	@cb: client callback functions
- *
- *	Returns channel pointer if successful, NULL otherwise.
- *
- *	Creates a channel buffer for each cpu using the sizes and
- *	attributes specified.  The created channel buffer files
- *	will be named base_filename0...base_filenameN-1.  File
- *	permissions will be S_IRUSR.
- */
-struct rchan *relay_open(const char *base_filename,
-			 struct dentry *parent,
-			 size_t subbuf_size,
-			 size_t n_subbufs,
-			 struct rchan_callbacks *cb)
-{
-	unsigned int i;
-	struct rchan *chan;
-	char *tmpname;
-	int is_global = 0;
-
-	if (!base_filename)
-		return NULL;
-
-	if (!(subbuf_size && n_subbufs))
-		return NULL;
-
-	chan = kcalloc(1, sizeof(struct rchan), GFP_KERNEL);
-	if (!chan)
-		return NULL;
-
-	chan->version = RELAYFS_CHANNEL_VERSION;
-	chan->n_subbufs = n_subbufs;
-	chan->subbuf_size = subbuf_size;
-	chan->alloc_size = FIX_SIZE(subbuf_size * n_subbufs);
-	setup_callbacks(chan, cb);
-	kref_init(&chan->kref);
-
-	tmpname = kmalloc(NAME_MAX + 1, GFP_KERNEL);
-	if (!tmpname)
-		goto free_chan;
-
-	for_each_online_cpu(i) {
-		sprintf(tmpname, "%s%d", base_filename, i);
-		chan->buf[i] = relay_open_buf(chan, tmpname, parent,
-					      &is_global);
-		chan->buf[i]->cpu = i;
-		if (!chan->buf[i])
-			goto free_bufs;
-	}
-
-	kfree(tmpname);
-	return chan;
-
-free_bufs:
-	for (i = 0; i < NR_CPUS; i++) {
-		if (!chan->buf[i])
-			break;
-		relay_close_buf(chan->buf[i]);
-		if (is_global)
-			break;
-	}
-	kfree(tmpname);
-
-free_chan:
-	kref_put(&chan->kref, relay_destroy_channel);
-	return NULL;
-}
-
-/**
- *	relay_switch_subbuf - switch to a new sub-buffer
- *	@buf: channel buffer
- *	@length: size of current event
- *
- *	Returns either the length passed in or 0 if full.
-
- *	Performs sub-buffer-switch tasks such as invoking callbacks,
- *	updating padding counts, waking up readers, etc.
- */
-size_t relay_switch_subbuf(struct rchan_buf *buf, size_t length)
-{
-	void *old, *new;
-	size_t old_subbuf, new_subbuf;
-
-	if (unlikely(length > buf->chan->subbuf_size))
-		goto toobig;
-
-	if (buf->offset != buf->chan->subbuf_size + 1) {
-		buf->prev_padding = buf->chan->subbuf_size - buf->offset;
-		old_subbuf = buf->subbufs_produced % buf->chan->n_subbufs;
-		buf->padding[old_subbuf] = buf->prev_padding;
-		buf->subbufs_produced++;
-		if (waitqueue_active(&buf->read_wait)) {
-			PREPARE_WORK(&buf->wake_readers, wakeup_readers, buf);
-			schedule_delayed_work(&buf->wake_readers, 1);
-		}
-	}
-
-	old = buf->data;
-	new_subbuf = buf->subbufs_produced % buf->chan->n_subbufs;
-	new = buf->start + new_subbuf * buf->chan->subbuf_size;
-	buf->offset = 0;
-	if (!buf->chan->cb->subbuf_start(buf, new, old, buf->prev_padding)) {
-		buf->offset = buf->chan->subbuf_size + 1;
-		return 0;
-	}
-	buf->data = new;
-	buf->padding[new_subbuf] = 0;
-
-	if (unlikely(length + buf->offset > buf->chan->subbuf_size))
-		goto toobig;
-
-	return length;
-
-toobig:
-	buf->chan->last_toobig = length;
-	return 0;
-}
-
-/**
- *	relay_subbufs_consumed - update the buffer's sub-buffers-consumed count
- *	@chan: the channel
- *	@cpu: the cpu associated with the channel buffer to update
- *	@subbufs_consumed: number of sub-buffers to add to current buf's count
- *
- *	Adds to the channel buffer's consumed sub-buffer count.
- *	subbufs_consumed should be the number of sub-buffers newly consumed,
- *	not the total consumed.
- *
- *	NOTE: kernel clients don't need to call this function if the channel
- *	mode is 'overwrite'.
- */
-void relay_subbufs_consumed(struct rchan *chan,
-			    unsigned int cpu,
-			    size_t subbufs_consumed)
-{
-	struct rchan_buf *buf;
-
-	if (!chan)
-		return;
-
-	if (cpu >= NR_CPUS || !chan->buf[cpu])
-		return;
-
-	buf = chan->buf[cpu];
-	buf->subbufs_consumed += subbufs_consumed;
-	if (buf->subbufs_consumed > buf->subbufs_produced)
-		buf->subbufs_consumed = buf->subbufs_produced;
-}
-
-/**
- *	relay_destroy_channel - free the channel struct
- *
- *	Should only be called from kref_put().
- */
-void relay_destroy_channel(struct kref *kref)
-{
-	struct rchan *chan = container_of(kref, struct rchan, kref);
-	kfree(chan);
-}
-
-/**
- *	relay_close - close the channel
- *	@chan: the channel
- *
- *	Closes all channel buffers and frees the channel.
- */
-void relay_close(struct rchan *chan)
-{
-	unsigned int i;
-	struct rchan_buf *prev = NULL;
-
-	if (!chan)
-		return;
-
-	for (i = 0; i < NR_CPUS; i++) {
-		if (!chan->buf[i] || chan->buf[i] == prev)
-			break;
-		relay_close_buf(chan->buf[i]);
-		prev = chan->buf[i];
-	}
-
-	if (chan->last_toobig)
-		printk(KERN_WARNING "relayfs: one or more items not logged "
-		       "[item size (%Zd) > sub-buffer size (%Zd)]\n",
-		       chan->last_toobig, chan->subbuf_size);
-
-	kref_put(&chan->kref, relay_destroy_channel);
-}
-
-/**
- *	relay_flush - close the channel
- *	@chan: the channel
- *
- *	Flushes all channel buffers i.e. forces buffer switch.
- */
-void relay_flush(struct rchan *chan)
-{
-	unsigned int i;
-	struct rchan_buf *prev = NULL;
-
-	if (!chan)
-		return;
-
-	for (i = 0; i < NR_CPUS; i++) {
-		if (!chan->buf[i] || chan->buf[i] == prev)
-			break;
-		relay_switch_subbuf(chan->buf[i], 0);
-		prev = chan->buf[i];
-	}
-}
-
-EXPORT_SYMBOL_GPL(relay_open);
-EXPORT_SYMBOL_GPL(relay_close);
-EXPORT_SYMBOL_GPL(relay_flush);
-EXPORT_SYMBOL_GPL(relay_reset);
-EXPORT_SYMBOL_GPL(relay_subbufs_consumed);
-EXPORT_SYMBOL_GPL(relay_switch_subbuf);
-EXPORT_SYMBOL_GPL(relay_buf_full);