Remove fuse kernel module sources

1 files changed, 0 insertions, 1124 deletions

diff --git a/kernel/dev.c b/kernel/dev.c
deleted file mode 100644
index f8b7f3a..0000000
--- a/kernel/dev.c
+++ /dev/null
@@ -1,1124 +0,0 @@
-/*
-  FUSE: Filesystem in Userspace
-  Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>
-
-  This program can be distributed under the terms of the GNU GPL.
-  See the file COPYING.
-*/
-
-#include "fuse_i.h"
-
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/poll.h>
-#include <linux/uio.h>
-#include <linux/miscdevice.h>
-#include <linux/pagemap.h>
-#include <linux/file.h>
-#include <linux/slab.h>
-
-#ifdef MODULE_ALIAS_MISCDEV
-MODULE_ALIAS_MISCDEV(FUSE_MINOR);
-#endif
-
-static struct kmem_cache *fuse_req_cachep;
-
-static struct fuse_conn *fuse_get_conn(struct file *file)
-{
-	/*
-	 * Lockless access is OK, because file->private data is set
-	 * once during mount and is valid until the file is released.
-	 */
-	return file->private_data;
-}
-
-static void fuse_request_init(struct fuse_req *req)
-{
-	memset(req, 0, sizeof(*req));
-	INIT_LIST_HEAD(&req->list);
-	INIT_LIST_HEAD(&req->intr_entry);
-	init_waitqueue_head(&req->waitq);
-	atomic_set(&req->count, 1);
-}
-
-struct fuse_req *fuse_request_alloc(void)
-{
-	struct fuse_req *req = kmem_cache_alloc(fuse_req_cachep, GFP_KERNEL);
-	if (req)
-		fuse_request_init(req);
-	return req;
-}
-
-void fuse_request_free(struct fuse_req *req)
-{
-	kmem_cache_free(fuse_req_cachep, req);
-}
-
-static void block_sigs(sigset_t *oldset)
-{
-	sigset_t mask;
-
-	siginitsetinv(&mask, sigmask(SIGKILL));
-	sigprocmask(SIG_BLOCK, &mask, oldset);
-}
-
-static void restore_sigs(sigset_t *oldset)
-{
-	sigprocmask(SIG_SETMASK, oldset, NULL);
-}
-
-static void __fuse_get_request(struct fuse_req *req)
-{
-	atomic_inc(&req->count);
-}
-
-/* Must be called with > 1 refcount */
-static void __fuse_put_request(struct fuse_req *req)
-{
-	BUG_ON(atomic_read(&req->count) < 2);
-	atomic_dec(&req->count);
-}
-
-static void fuse_req_init_context(struct fuse_req *req)
-{
-	req->in.h.uid = current->fsuid;
-	req->in.h.gid = current->fsgid;
-	req->in.h.pid = current->pid;
-}
-
-struct fuse_req *fuse_get_req(struct fuse_conn *fc)
-{
-	struct fuse_req *req;
-	sigset_t oldset;
-	int intr;
-	int err;
-
-	atomic_inc(&fc->num_waiting);
-	block_sigs(&oldset);
-	intr = wait_event_interruptible(fc->blocked_waitq, !fc->blocked);
-	restore_sigs(&oldset);
-	err = -EINTR;
-	if (intr)
-		goto out;
-
-	err = -ENOTCONN;
-	if (!fc->connected)
-		goto out;
-
-	req = fuse_request_alloc();
-	err = -ENOMEM;
-	if (!req)
-		goto out;
-
-	fuse_req_init_context(req);
-	req->waiting = 1;
-	return req;
-
- out:
-	atomic_dec(&fc->num_waiting);
-	return ERR_PTR(err);
-}
-
-/*
- * Return request in fuse_file->reserved_req.  However that may
- * currently be in use.  If that is the case, wait for it to become
- * available.
- */
-static struct fuse_req *get_reserved_req(struct fuse_conn *fc,
-					 struct file *file)
-{
-	struct fuse_req *req = NULL;
-	struct fuse_file *ff = file->private_data;
-
-	do {
-		wait_event(fc->reserved_req_waitq, ff->reserved_req);
-		spin_lock(&fc->lock);
-		if (ff->reserved_req) {
-			req = ff->reserved_req;
-			ff->reserved_req = NULL;
-			get_file(file);
-			req->stolen_file = file;
-		}
-		spin_unlock(&fc->lock);
-	} while (!req);
-
-	return req;
-}
-
-/*
- * Put stolen request back into fuse_file->reserved_req
- */
-static void put_reserved_req(struct fuse_conn *fc, struct fuse_req *req)
-{
-	struct file *file = req->stolen_file;
-	struct fuse_file *ff = file->private_data;
-
-	spin_lock(&fc->lock);
-	fuse_request_init(req);
-	BUG_ON(ff->reserved_req);
-	ff->reserved_req = req;
-	wake_up_all(&fc->reserved_req_waitq);
-	spin_unlock(&fc->lock);
-	fput(file);
-}
-
-/*
- * Gets a requests for a file operation, always succeeds
- *
- * This is used for sending the FLUSH request, which must get to
- * userspace, due to POSIX locks which may need to be unlocked.
- *
- * If allocation fails due to OOM, use the reserved request in
- * fuse_file.
- *
- * This is very unlikely to deadlock accidentally, since the
- * filesystem should not have it's own file open.  If deadlock is
- * intentional, it can still be broken by "aborting" the filesystem.
- */
-struct fuse_req *fuse_get_req_nofail(struct fuse_conn *fc, struct file *file)
-{
-	struct fuse_req *req;
-
-	atomic_inc(&fc->num_waiting);
-	wait_event(fc->blocked_waitq, !fc->blocked);
-	req = fuse_request_alloc();
-	if (!req)
-		req = get_reserved_req(fc, file);
-
-	fuse_req_init_context(req);
-	req->waiting = 1;
-	return req;
-}
-
-void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req)
-{
-	if (atomic_dec_and_test(&req->count)) {
-		if (req->waiting)
-			atomic_dec(&fc->num_waiting);
-
-		if (req->stolen_file)
-			put_reserved_req(fc, req);
-		else
-			fuse_request_free(req);
-	}
-}
-
-/*
- * This function is called when a request is finished.  Either a reply
- * has arrived or it was aborted (and not yet sent) or some error
- * occurred during communication with userspace, or the device file
- * was closed.  The requester thread is woken up (if still waiting),
- * the 'end' callback is called if given, else the reference to the
- * request is released
- *
- * Called with fc->lock, unlocks it
- */
-static void request_end(struct fuse_conn *fc, struct fuse_req *req)
-{
-	void (*end) (struct fuse_conn *, struct fuse_req *) = req->end;
-	req->end = NULL;
-	list_del(&req->list);
-	list_del(&req->intr_entry);
-	req->state = FUSE_REQ_FINISHED;
-	if (req->background) {
-		if (fc->num_background == FUSE_MAX_BACKGROUND) {
-			fc->blocked = 0;
-			wake_up_all(&fc->blocked_waitq);
-		}
-		fc->num_background--;
-	}
-	spin_unlock(&fc->lock);
-	dput(req->dentry);
-	mntput(req->vfsmount);
-	if (req->file)
-		fput(req->file);
-	wake_up(&req->waitq);
-	if (end)
-		end(fc, req);
-	else
-		fuse_put_request(fc, req);
-}
-
-static void wait_answer_interruptible(struct fuse_conn *fc,
-				      struct fuse_req *req)
-{
-	if (signal_pending(current))
-		return;
-
-	spin_unlock(&fc->lock);
-	wait_event_interruptible(req->waitq, req->state == FUSE_REQ_FINISHED);
-	spin_lock(&fc->lock);
-}
-
-static void queue_interrupt(struct fuse_conn *fc, struct fuse_req *req)
-{
-	list_add_tail(&req->intr_entry, &fc->interrupts);
-	wake_up(&fc->waitq);
-	kill_fasync(&fc->fasync, SIGIO, POLL_IN);
-}
-
-/* Called with fc->lock held.  Releases, and then reacquires it. */
-static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req)
-{
-	if (!fc->no_interrupt) {
-		/* Any signal may interrupt this */
-		wait_answer_interruptible(fc, req);
-
-		if (req->aborted)
-			goto aborted;
-		if (req->state == FUSE_REQ_FINISHED)
-			return;
-
-		req->interrupted = 1;
-		if (req->state == FUSE_REQ_SENT)
-			queue_interrupt(fc, req);
-	}
-
-	if (req->force) {
-		spin_unlock(&fc->lock);
-		wait_event(req->waitq, req->state == FUSE_REQ_FINISHED);
-		spin_lock(&fc->lock);
-	} else {
-		sigset_t oldset;
-
-		/* Only fatal signals may interrupt this */
-		block_sigs(&oldset);
-		wait_answer_interruptible(fc, req);
-		restore_sigs(&oldset);
-	}
-
-	if (req->aborted)
-		goto aborted;
-	if (req->state == FUSE_REQ_FINISHED)
- 		return;
-
-	req->out.h.error = -EINTR;
-	req->aborted = 1;
-
- aborted:
-	if (req->locked) {
-		/* This is uninterruptible sleep, because data is
-		   being copied to/from the buffers of req.  During
-		   locked state, there mustn't be any filesystem
-		   operation (e.g. page fault), since that could lead
-		   to deadlock */
-		spin_unlock(&fc->lock);
-		wait_event(req->waitq, !req->locked);
-		spin_lock(&fc->lock);
-	}
-	if (req->state == FUSE_REQ_PENDING) {
-		list_del(&req->list);
-		__fuse_put_request(req);
-	} else if (req->state == FUSE_REQ_SENT) {
-		spin_unlock(&fc->lock);
-		wait_event(req->waitq, req->state == FUSE_REQ_FINISHED);
-		spin_lock(&fc->lock);
-	}
-}
-
-static unsigned len_args(unsigned numargs, struct fuse_arg *args)
-{
-	unsigned nbytes = 0;
-	unsigned i;
-
-	for (i = 0; i < numargs; i++)
-		nbytes += args[i].size;
-
-	return nbytes;
-}
-
-static u64 fuse_get_unique(struct fuse_conn *fc)
- {
- 	fc->reqctr++;
- 	/* zero is special */
- 	if (fc->reqctr == 0)
- 		fc->reqctr = 1;
-
-	return fc->reqctr;
-}
-
-static void queue_request(struct fuse_conn *fc, struct fuse_req *req)
-{
-	req->in.h.unique = fuse_get_unique(fc);
-	req->in.h.len = sizeof(struct fuse_in_header) +
-		len_args(req->in.numargs, (struct fuse_arg *) req->in.args);
-	list_add_tail(&req->list, &fc->pending);
-	req->state = FUSE_REQ_PENDING;
-	if (!req->waiting) {
-		req->waiting = 1;
-		atomic_inc(&fc->num_waiting);
-	}
-	wake_up(&fc->waitq);
-	kill_fasync(&fc->fasync, SIGIO, POLL_IN);
-}
-
-void request_send(struct fuse_conn *fc, struct fuse_req *req)
-{
-	req->isreply = 1;
-	spin_lock(&fc->lock);
-	if (!fc->connected)
-		req->out.h.error = -ENOTCONN;
-	else if (fc->conn_error)
-		req->out.h.error = -ECONNREFUSED;
-	else {
-		queue_request(fc, req);
-		/* acquire extra reference, since request is still needed
-		   after request_end() */
-		__fuse_get_request(req);
-
-		request_wait_answer(fc, req);
-	}
-	spin_unlock(&fc->lock);
-}
-
-static void request_send_nowait(struct fuse_conn *fc, struct fuse_req *req)
-{
-	spin_lock(&fc->lock);
-	if (fc->connected) {
-		req->background = 1;
-		fc->num_background++;
-		if (fc->num_background == FUSE_MAX_BACKGROUND)
-			fc->blocked = 1;
-
-		queue_request(fc, req);
-		spin_unlock(&fc->lock);
-	} else {
-		req->out.h.error = -ENOTCONN;
-		request_end(fc, req);
-	}
-}
-
-void request_send_noreply(struct fuse_conn *fc, struct fuse_req *req)
-{
-	req->isreply = 0;
-	request_send_nowait(fc, req);
-}
-
-void request_send_background(struct fuse_conn *fc, struct fuse_req *req)
-{
-	req->isreply = 1;
-	request_send_nowait(fc, req);
-}
-
-/*
- * Lock the request.  Up to the next unlock_request() there mustn't be
- * anything that could cause a page-fault.  If the request was already
- * aborted bail out.
- */
-static int lock_request(struct fuse_conn *fc, struct fuse_req *req)
-{
-	int err = 0;
-	if (req) {
-		spin_lock(&fc->lock);
-		if (req->aborted)
-			err = -ENOENT;
-		else
-			req->locked = 1;
-		spin_unlock(&fc->lock);
-	}
-	return err;
-}
-
-/*
- * Unlock request.  If it was aborted during being locked, the
- * requester thread is currently waiting for it to be unlocked, so
- * wake it up.
- */
-static void unlock_request(struct fuse_conn *fc, struct fuse_req *req)
-{
-	if (req) {
-		spin_lock(&fc->lock);
-		req->locked = 0;
-		if (req->aborted)
-			wake_up(&req->waitq);
-		spin_unlock(&fc->lock);
-	}
-}
-
-struct fuse_copy_state {
-	struct fuse_conn *fc;
-	int write;
-	struct fuse_req *req;
-	const struct iovec *iov;
-	unsigned long nr_segs;
-	unsigned long seglen;
-	unsigned long addr;
-	struct page *pg;
-	void *mapaddr;
-	void *buf;
-	unsigned len;
-};
-
-static void fuse_copy_init(struct fuse_copy_state *cs, struct fuse_conn *fc,
-			   int write, struct fuse_req *req,
-			   const struct iovec *iov, unsigned long nr_segs)
-{
-	memset(cs, 0, sizeof(*cs));
-	cs->fc = fc;
-	cs->write = write;
-	cs->req = req;
-	cs->iov = iov;
-	cs->nr_segs = nr_segs;
-}
-
-/* Unmap and put previous page of userspace buffer */
-static void fuse_copy_finish(struct fuse_copy_state *cs)
-{
-	if (cs->mapaddr) {
-		kunmap_atomic(cs->mapaddr, KM_USER0);
-		if (cs->write) {
-			flush_dcache_page(cs->pg);
-			set_page_dirty_lock(cs->pg);
-		}
-		put_page(cs->pg);
-		cs->mapaddr = NULL;
-	}
-}
-
-/*
- * Get another pagefull of userspace buffer, and map it to kernel
- * address space, and lock request
- */
-static int fuse_copy_fill(struct fuse_copy_state *cs)
-{
-	unsigned long offset;
-	int err;
-#ifdef DCACHE_BUG
-	struct vm_area_struct *vma;
-#endif
-
-	unlock_request(cs->fc, cs->req);
-	fuse_copy_finish(cs);
-	if (!cs->seglen) {
-		BUG_ON(!cs->nr_segs);
-		cs->seglen = cs->iov[0].iov_len;
-		cs->addr = (unsigned long) cs->iov[0].iov_base;
-		cs->iov ++;
-		cs->nr_segs --;
-	}
-	down_read(&current->mm->mmap_sem);
-#ifndef DCACHE_BUG
-	err = get_user_pages(current, current->mm, cs->addr, 1, cs->write, 0,
-			     &cs->pg, NULL);
-#else
-	err = get_user_pages(current, current->mm, cs->addr, 1, cs->write, 0,
-			     &cs->pg, &vma);
-#endif
-	up_read(&current->mm->mmap_sem);
-	if (err < 0)
-		return err;
-	BUG_ON(err != 1);
-	offset = cs->addr % PAGE_SIZE;
-	cs->mapaddr = kmap_atomic(cs->pg, KM_USER0);
-#ifdef DCACHE_BUG
-	flush_cache_page(vma, cs->addr, page_to_pfn(cs->pg));
-#endif
-	cs->buf = cs->mapaddr + offset;
-	cs->len = min(PAGE_SIZE - offset, cs->seglen);
-	cs->seglen -= cs->len;
-	cs->addr += cs->len;
-
-	return lock_request(cs->fc, cs->req);
-}
-
-/* Do as much copy to/from userspace buffer as we can */
-static int fuse_copy_do(struct fuse_copy_state *cs, void **val, unsigned *size)
-{
-	unsigned ncpy = min(*size, cs->len);
-	if (val) {
-		if (cs->write)
-			memcpy(cs->buf, *val, ncpy);
-		else
-			memcpy(*val, cs->buf, ncpy);
-		*val += ncpy;
-	}
-	*size -= ncpy;
-	cs->len -= ncpy;
-	cs->buf += ncpy;
-	return ncpy;
-}
-
-/*
- * Copy a page in the request to/from the userspace buffer.  Must be
- * done atomically
- */
-static int fuse_copy_page(struct fuse_copy_state *cs, struct page *page,
-			  unsigned offset, unsigned count, int zeroing)
-{
-	if (page && zeroing && count < PAGE_SIZE) {
-		void *mapaddr = kmap_atomic(page, KM_USER1);
-		memset(mapaddr, 0, PAGE_SIZE);
-		kunmap_atomic(mapaddr, KM_USER1);
-	}
-	while (count) {
-		int err;
-		if (!cs->len && (err = fuse_copy_fill(cs)))
-			return err;
-		if (page) {
-			void *mapaddr = kmap_atomic(page, KM_USER1);
-			void *buf = mapaddr + offset;
-			offset += fuse_copy_do(cs, &buf, &count);
-			kunmap_atomic(mapaddr, KM_USER1);
-		} else
-			offset += fuse_copy_do(cs, NULL, &count);
-	}
-	if (page && !cs->write)
-		flush_dcache_page(page);
-	return 0;
-}
-
-/* Copy pages in the request to/from userspace buffer */
-static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes,
-			   int zeroing)
-{
-	unsigned i;
-	struct fuse_req *req = cs->req;
-	unsigned offset = req->page_offset;
-	unsigned count = min(nbytes, (unsigned) PAGE_SIZE - offset);
-
-	for (i = 0; i < req->num_pages && (nbytes || zeroing); i++) {
-		struct page *page = req->pages[i];
-		int err = fuse_copy_page(cs, page, offset, count, zeroing);
-		if (err)
-			return err;
-
-		nbytes -= count;
-		count = min(nbytes, (unsigned) PAGE_SIZE);
-		offset = 0;
-	}
-	return 0;
-}
-
-/* Copy a single argument in the request to/from userspace buffer */
-static int fuse_copy_one(struct fuse_copy_state *cs, void *val, unsigned size)
-{
-	while (size) {
-		int err;
-		if (!cs->len && (err = fuse_copy_fill(cs)))
-			return err;
-		fuse_copy_do(cs, &val, &size);
-	}
-	return 0;
-}
-
-/* Copy request arguments to/from userspace buffer */
-static int fuse_copy_args(struct fuse_copy_state *cs, unsigned numargs,
-			  unsigned argpages, struct fuse_arg *args,
-			  int zeroing)
-{
-	int err = 0;
-	unsigned i;
-
-	for (i = 0; !err && i < numargs; i++)  {
-		struct fuse_arg *arg = &args[i];
-		if (i == numargs - 1 && argpages)
-			err = fuse_copy_pages(cs, arg->size, zeroing);
-		else
-			err = fuse_copy_one(cs, arg->value, arg->size);
-	}
-	return err;
-}
-
-static int request_pending(struct fuse_conn *fc)
-{
-	return !list_empty(&fc->pending) || !list_empty(&fc->interrupts);
-}
-
-/* Wait until a request is available on the pending list */
-static void request_wait(struct fuse_conn *fc)
-{
-	DECLARE_WAITQUEUE(wait, current);
-
-	add_wait_queue_exclusive(&fc->waitq, &wait);
-	while (fc->connected && !request_pending(fc)) {
-		set_current_state(TASK_INTERRUPTIBLE);
-		if (signal_pending(current))
-			break;
-
-		spin_unlock(&fc->lock);
-		schedule();
-		spin_lock(&fc->lock);
-	}
-	set_current_state(TASK_RUNNING);
-	remove_wait_queue(&fc->waitq, &wait);
-}
-
-/*
- * Transfer an interrupt request to userspace
- *
- * Unlike other requests this is assembled on demand, without a need
- * to allocate a separate fuse_req structure.
- *
- * Called with fc->lock held, releases it
- */
-static int fuse_read_interrupt(struct fuse_conn *fc, struct fuse_req *req,
-			       const struct iovec *iov, unsigned long nr_segs)
-{
-	struct fuse_copy_state cs;
-	struct fuse_in_header ih;
-	struct fuse_interrupt_in arg;
-	unsigned reqsize = sizeof(ih) + sizeof(arg);
-	int err;
-
-	list_del_init(&req->intr_entry);
-	req->intr_unique = fuse_get_unique(fc);
-	memset(&ih, 0, sizeof(ih));
-	memset(&arg, 0, sizeof(arg));
-	ih.len = reqsize;
-	ih.opcode = FUSE_INTERRUPT;
-	ih.unique = req->intr_unique;
-	arg.unique = req->in.h.unique;
-
-	spin_unlock(&fc->lock);
-	if (iov_length(iov, nr_segs) < reqsize)
-		return -EINVAL;
-
-	fuse_copy_init(&cs, fc, 1, NULL, iov, nr_segs);
-	err = fuse_copy_one(&cs, &ih, sizeof(ih));
-	if (!err)
-		err = fuse_copy_one(&cs, &arg, sizeof(arg));
-	fuse_copy_finish(&cs);
-
-	return err ? err : reqsize;
-}
-
-/*
- * Read a single request into the userspace filesystem's buffer.  This
- * function waits until a request is available, then removes it from
- * the pending list and copies request data to userspace buffer.  If
- * no reply is needed (FORGET) or request has been aborted or there
- * was an error during the copying then it's finished by calling
- * request_end().  Otherwise add it to the processing list, and set
- * the 'sent' flag.
- */
-static ssize_t fuse_dev_readv(struct file *file, const struct iovec *iov,
-			      unsigned long nr_segs, loff_t *off)
-{
-	int err;
-	struct fuse_req *req;
-	struct fuse_in *in;
-	struct fuse_copy_state cs;
-	unsigned reqsize;
-	struct fuse_conn *fc = fuse_get_conn(file);
-	if (!fc)
-		return -EPERM;
-
- restart:
-	spin_lock(&fc->lock);
-	err = -EAGAIN;
-	if ((file->f_flags & O_NONBLOCK) && fc->connected &&
-	    !request_pending(fc))
-		goto err_unlock;
-
-	request_wait(fc);
-	err = -ENODEV;
-	if (!fc->connected)
-		goto err_unlock;
-	err = -ERESTARTSYS;
-	if (!request_pending(fc))
-		goto err_unlock;
-
-	if (!list_empty(&fc->interrupts)) {
-		req = list_entry(fc->interrupts.next, struct fuse_req,
-				 intr_entry);
-		return fuse_read_interrupt(fc, req, iov, nr_segs);
-	}
-
-	req = list_entry(fc->pending.next, struct fuse_req, list);
-	req->state = FUSE_REQ_READING;
-	list_move(&req->list, &fc->io);
-
-	in = &req->in;
-	reqsize = in->h.len;
-	/* If request is too large, reply with an error and restart the read */
-	if (iov_length(iov, nr_segs) < reqsize) {
-		req->out.h.error = -EIO;
-		/* SETXATTR is special, since it may contain too large data */
-		if (in->h.opcode == FUSE_SETXATTR)
-			req->out.h.error = -E2BIG;
-		request_end(fc, req);
-		goto restart;
-	}
-	spin_unlock(&fc->lock);
-	fuse_copy_init(&cs, fc, 1, req, iov, nr_segs);
-	err = fuse_copy_one(&cs, &in->h, sizeof(in->h));
-	if (!err)
-		err = fuse_copy_args(&cs, in->numargs, in->argpages,
-				     (struct fuse_arg *) in->args, 0);
-	fuse_copy_finish(&cs);
-	spin_lock(&fc->lock);
-	req->locked = 0;
-	if (!err && req->aborted)
-		err = -ENOENT;
-	if (err) {
-		if (!req->aborted)
-			req->out.h.error = -EIO;
-		request_end(fc, req);
-		return err;
-	}
-	if (!req->isreply)
-		request_end(fc, req);
-	else {
-		req->state = FUSE_REQ_SENT;
-		list_move_tail(&req->list, &fc->processing);
-		if (req->interrupted)
-			queue_interrupt(fc, req);
-		spin_unlock(&fc->lock);
-	}
-	return reqsize;
-
- err_unlock:
-	spin_unlock(&fc->lock);
-	return err;
-}
-
-#ifndef KERNEL_2_6_19_PLUS
-static ssize_t fuse_dev_read(struct file *file, char __user *buf,
-			     size_t nbytes, loff_t *off)
-{
-	struct iovec iov;
-	iov.iov_len = nbytes;
-	iov.iov_base = buf;
-	return fuse_dev_readv(file, &iov, 1, off);
-}
-#else
-static ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov,
-			     unsigned long nr_segs, loff_t pos)
-{
-	return fuse_dev_readv(iocb->ki_filp, iov, nr_segs, &pos);
-}
-#endif
-
-/* Look up request on processing list by unique ID */
-static struct fuse_req *request_find(struct fuse_conn *fc, u64 unique)
-{
-	struct list_head *entry;
-
-	list_for_each(entry, &fc->processing) {
-		struct fuse_req *req;
-		req = list_entry(entry, struct fuse_req, list);
-		if (req->in.h.unique == unique || req->intr_unique == unique)
-			return req;
-	}
-	return NULL;
-}
-
-static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out,
-			 unsigned nbytes)
-{
-	unsigned reqsize = sizeof(struct fuse_out_header);
-
-	if (out->h.error)
-		return nbytes != reqsize ? -EINVAL : 0;
-
-	reqsize += len_args(out->numargs, out->args);
-
-	if (reqsize < nbytes || (reqsize > nbytes && !out->argvar))
-		return -EINVAL;
-	else if (reqsize > nbytes) {
-		struct fuse_arg *lastarg = &out->args[out->numargs-1];
-		unsigned diffsize = reqsize - nbytes;
-		if (diffsize > lastarg->size)
-			return -EINVAL;
-		lastarg->size -= diffsize;
-	}
-	return fuse_copy_args(cs, out->numargs, out->argpages, out->args,
-			      out->page_zeroing);
-}
-
-/*
- * Write a single reply to a request.  First the header is copied from
- * the write buffer.  The request is then searched on the processing
- * list by the unique ID found in the header.  If found, then remove
- * it from the list and copy the rest of the buffer to the request.
- * The request is finished by calling request_end()
- */
-static ssize_t fuse_dev_writev(struct file *file, const struct iovec *iov,
-			       unsigned long nr_segs, loff_t *off)
-{
-	int err;
-	unsigned nbytes = iov_length(iov, nr_segs);
-	struct fuse_req *req;
-	struct fuse_out_header oh;
-	struct fuse_copy_state cs;
-	struct fuse_conn *fc = fuse_get_conn(file);
-	if (!fc)
-		return -EPERM;
-
-	fuse_copy_init(&cs, fc, 0, NULL, iov, nr_segs);
-	if (nbytes < sizeof(struct fuse_out_header))
-		return -EINVAL;
-
-	err = fuse_copy_one(&cs, &oh, sizeof(oh));
-	if (err)
-		goto err_finish;
-	err = -EINVAL;
-	if (!oh.unique || oh.error <= -1000 || oh.error > 0 ||
-	    oh.len != nbytes)
-		goto err_finish;
-
-	spin_lock(&fc->lock);
-	err = -ENOENT;
-	if (!fc->connected)
-		goto err_unlock;
-
-	req = request_find(fc, oh.unique);
-	if (!req)
-		goto err_unlock;
-
-	if (req->aborted) {
-		spin_unlock(&fc->lock);
-		fuse_copy_finish(&cs);
-		spin_lock(&fc->lock);
-		request_end(fc, req);
-		return -ENOENT;
-	}
-	/* Is it an interrupt reply? */
-	if (req->intr_unique == oh.unique) {
-		err = -EINVAL;
-		if (nbytes != sizeof(struct fuse_out_header))
-			goto err_unlock;
-
-		if (oh.error == -ENOSYS)
-			fc->no_interrupt = 1;
-		else if (oh.error == -EAGAIN)
-			queue_interrupt(fc, req);
-
-		spin_unlock(&fc->lock);
-		fuse_copy_finish(&cs);
-		return nbytes;
-	}
-
-	req->state = FUSE_REQ_WRITING;
-	list_move(&req->list, &fc->io);
-	req->out.h = oh;
-	req->locked = 1;
-	cs.req = req;
-	spin_unlock(&fc->lock);
-
-	err = copy_out_args(&cs, &req->out, nbytes);
-	fuse_copy_finish(&cs);
-
-	spin_lock(&fc->lock);
-	req->locked = 0;
-	if (!err) {
-		if (req->aborted)
-			err = -ENOENT;
-	} else if (!req->aborted)
-		req->out.h.error = -EIO;
-	request_end(fc, req);
-
-	return err ? err : nbytes;
-
- err_unlock:
-	spin_unlock(&fc->lock);
- err_finish:
-	fuse_copy_finish(&cs);
-	return err;
-}
-
-#ifndef KERNEL_2_6_19_PLUS
-static ssize_t fuse_dev_write(struct file *file, const char __user *buf,
-			      size_t nbytes, loff_t *off)
-{
-	struct iovec iov;
-	iov.iov_len = nbytes;
-	iov.iov_base = (char __user *) buf;
-	return fuse_dev_writev(file, &iov, 1, off);
-}
-#else
-static ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov,
-			      unsigned long nr_segs, loff_t pos)
-{
-	return fuse_dev_writev(iocb->ki_filp, iov, nr_segs, &pos);
-}
-#endif
-
-static unsigned fuse_dev_poll(struct file *file, poll_table *wait)
-{
-	unsigned mask = POLLOUT | POLLWRNORM;
-	struct fuse_conn *fc = fuse_get_conn(file);
-	if (!fc)
-		return POLLERR;
-
-	poll_wait(file, &fc->waitq, wait);
-
-	spin_lock(&fc->lock);
-	if (!fc->connected)
-		mask = POLLERR;
-	else if (request_pending(fc))
-		mask |= POLLIN | POLLRDNORM;
-	spin_unlock(&fc->lock);
-
-	return mask;
-}
-
-/*
- * Abort all requests on the given list (pending or processing)
- *
- * This function releases and reacquires fc->lock
- */
-static void end_requests(struct fuse_conn *fc, struct list_head *head)
-{
-	while (!list_empty(head)) {
-		struct fuse_req *req;
-		req = list_entry(head->next, struct fuse_req, list);
-		req->out.h.error = -ECONNABORTED;
-		request_end(fc, req);
-		spin_lock(&fc->lock);
-	}
-}
-
-/*
- * Abort requests under I/O
- *
- * The requests are set to aborted and finished, and the request
- * waiter is woken up.  This will make request_wait_answer() wait
- * until the request is unlocked and then return.
- *
- * If the request is asynchronous, then the end function needs to be
- * called after waiting for the request to be unlocked (if it was
- * locked).
- */
-static void end_io_requests(struct fuse_conn *fc)
-{
-	while (!list_empty(&fc->io)) {
-		struct fuse_req *req =
-			list_entry(fc->io.next, struct fuse_req, list);
-		void (*end) (struct fuse_conn *, struct fuse_req *) = req->end;
-
-		req->aborted = 1;
-		req->out.h.error = -ECONNABORTED;
-		req->state = FUSE_REQ_FINISHED;
-		list_del_init(&req->list);
-		wake_up(&req->waitq);
-		if (end) {
-			req->end = NULL;
-			/* The end function will consume this reference */
-			__fuse_get_request(req);
-			spin_unlock(&fc->lock);
-			wait_event(req->waitq, !req->locked);
-			end(fc, req);
-			spin_lock(&fc->lock);
-		}
-	}
-}
-
-/*
- * Abort all requests.
- *
- * Emergency exit in case of a malicious or accidental deadlock, or
- * just a hung filesystem.
- *
- * The same effect is usually achievable through killing the
- * filesystem daemon and all users of the filesystem.  The exception
- * is the combination of an asynchronous request and the tricky
- * deadlock (see Documentation/filesystems/fuse.txt).
- *
- * During the aborting, progression of requests from the pending and
- * processing lists onto the io list, and progression of new requests
- * onto the pending list is prevented by req->connected being false.
- *
- * Progression of requests under I/O to the processing list is
- * prevented by the req->aborted flag being true for these requests.
- * For this reason requests on the io list must be aborted first.
- */
-void fuse_abort_conn(struct fuse_conn *fc)
-{
-	spin_lock(&fc->lock);
-	if (fc->connected) {
-		fc->connected = 0;
-		fc->blocked = 0;
-		end_io_requests(fc);
-		end_requests(fc, &fc->pending);
-		end_requests(fc, &fc->processing);
-		wake_up_all(&fc->waitq);
-		wake_up_all(&fc->blocked_waitq);
-		kill_fasync(&fc->fasync, SIGIO, POLL_IN);
-	}
-	spin_unlock(&fc->lock);
-}
-
-static int fuse_dev_release(struct inode *inode, struct file *file)
-{
-	struct fuse_conn *fc = fuse_get_conn(file);
-	if (fc) {
-		spin_lock(&fc->lock);
-		fc->connected = 0;
-		end_requests(fc, &fc->pending);
-		end_requests(fc, &fc->processing);
-		spin_unlock(&fc->lock);
-		fasync_helper(-1, file, 0, &fc->fasync);
-		fuse_conn_put(fc);
-	}
-
-	return 0;
-}
-
-static int fuse_dev_fasync(int fd, struct file *file, int on)
-{
-	struct fuse_conn *fc = fuse_get_conn(file);
-	if (!fc)
-		return -EPERM;
-
-	/* No locking - fasync_helper does its own locking */
-	return fasync_helper(fd, file, on, &fc->fasync);
-}
-
-struct file_operations fuse_dev_operations = {
-	.owner		= THIS_MODULE,
-	.llseek		= no_llseek,
-#ifndef KERNEL_2_6_19_PLUS
-	.read		= fuse_dev_read,
-	.readv		= fuse_dev_readv,
-	.write		= fuse_dev_write,
-	.writev		= fuse_dev_writev,
-#else
-	.read		= do_sync_read,
-	.aio_read	= fuse_dev_read,
-	.write		= do_sync_write,
-	.aio_write	= fuse_dev_write,
-#endif
-	.poll		= fuse_dev_poll,
-	.release	= fuse_dev_release,
-	.fasync		= fuse_dev_fasync,
-};
-
-static struct miscdevice fuse_miscdevice = {
-	.minor = FUSE_MINOR,
-	.name  = "fuse",
-	.fops = &fuse_dev_operations,
-};
-
-int __init fuse_dev_init(void)
-{
-	int err = -ENOMEM;
-#ifdef KERNEL_2_6_23_PLUS
-	fuse_req_cachep = kmem_cache_create("fuse_request",
-					    sizeof(struct fuse_req),
-					    0, 0, NULL);
-#else
-	fuse_req_cachep = kmem_cache_create("fuse_request",
-					    sizeof(struct fuse_req),
-					    0, 0, NULL, NULL);
-#endif
-	if (!fuse_req_cachep)
-		goto out;
-
-	err = misc_register(&fuse_miscdevice);
-	if (err)
-		goto out_cache_clean;
-
-	return 0;
-
- out_cache_clean:
-	kmem_cache_destroy(fuse_req_cachep);
- out:
-	return err;
-}
-
-void fuse_dev_cleanup(void)
-{
-	misc_deregister(&fuse_miscdevice);
-	kmem_cache_destroy(fuse_req_cachep);
-}