Merge tag 'v2.6.39-rc7'

in order to pull in changes in drivers/media/dvb/firewire/ and
sound/firewire/.

6 files changed, 453 insertions, 119 deletions

diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c
index 3e87cce5837d..b6cca47f7b07 100644
--- a/fs/fuse/cuse.c
+++ b/fs/fuse/cuse.c
@@ -305,7 +305,7 @@ static void cuse_gendev_release(struct device *dev)
 static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
 {
 	struct cuse_conn *cc = fc_to_cc(fc);
-	struct cuse_init_out *arg = &req->misc.cuse_init_out;
+	struct cuse_init_out *arg = req->out.args[0].value;
 	struct page *page = req->pages[0];
 	struct cuse_devinfo devinfo = { };
 	struct device *dev;
@@ -384,6 +384,7 @@ static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
 	dev_set_uevent_suppress(dev, 0);
 	kobject_uevent(&dev->kobj, KOBJ_ADD);
 out:
+	kfree(arg);
 	__free_page(page);
 	return;
 
@@ -405,6 +406,7 @@ static int cuse_send_init(struct cuse_conn *cc)
 	struct page *page;
 	struct fuse_conn *fc = &cc->fc;
 	struct cuse_init_in *arg;
+	void *outarg;
 
 	BUILD_BUG_ON(CUSE_INIT_INFO_MAX > PAGE_SIZE);
 
@@ -419,6 +421,10 @@ static int cuse_send_init(struct cuse_conn *cc)
 	if (!page)
 		goto err_put_req;
 
+	outarg = kzalloc(sizeof(struct cuse_init_out), GFP_KERNEL);
+	if (!outarg)
+		goto err_free_page;
+
 	arg = &req->misc.cuse_init_in;
 	arg->major = FUSE_KERNEL_VERSION;
 	arg->minor = FUSE_KERNEL_MINOR_VERSION;
@@ -429,7 +435,7 @@ static int cuse_send_init(struct cuse_conn *cc)
 	req->in.args[0].value = arg;
 	req->out.numargs = 2;
 	req->out.args[0].size = sizeof(struct cuse_init_out);
-	req->out.args[0].value = &req->misc.cuse_init_out;
+	req->out.args[0].value = outarg;
 	req->out.args[1].size = CUSE_INIT_INFO_MAX;
 	req->out.argvar = 1;
 	req->out.argpages = 1;
@@ -440,6 +446,8 @@ static int cuse_send_init(struct cuse_conn *cc)
 
 	return 0;
 
+err_free_page:
+	__free_page(page);
 err_put_req:
 	fuse_put_request(fc, req);
 err:
@@ -458,7 +466,7 @@ static void cuse_fc_release(struct fuse_conn *fc)
  * @file: file struct being opened
  *
  * Userland CUSE server can create a CUSE device by opening /dev/cuse
- * and replying to the initilaization request kernel sends.  This
+ * and replying to the initialization request kernel sends.  This
  * function is responsible for handling CUSE device initialization.
  * Because the fd opened by this function is used during
  * initialization, this function only creates cuse_conn and sends
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 6e07696308dc..640fc229df10 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -251,6 +251,20 @@ static void queue_request(struct fuse_conn *fc, struct fuse_req *req)
 	kill_fasync(&fc->fasync, SIGIO, POLL_IN);
 }
 
+void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
+		       u64 nodeid, u64 nlookup)
+{
+	forget->forget_one.nodeid = nodeid;
+	forget->forget_one.nlookup = nlookup;
+
+	spin_lock(&fc->lock);
+	fc->forget_list_tail->next = forget;
+	fc->forget_list_tail = forget;
+	wake_up(&fc->waitq);
+	kill_fasync(&fc->fasync, SIGIO, POLL_IN);
+	spin_unlock(&fc->lock);
+}
+
 static void flush_bg_queue(struct fuse_conn *fc)
 {
 	while (fc->active_background < fc->max_background &&
@@ -438,12 +452,6 @@ static void fuse_request_send_nowait(struct fuse_conn *fc, struct fuse_req *req)
 	}
 }
 
-void fuse_request_send_noreply(struct fuse_conn *fc, struct fuse_req *req)
-{
-	req->isreply = 0;
-	fuse_request_send_nowait(fc, req);
-}
-
 void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req)
 {
 	req->isreply = 1;
@@ -729,14 +737,12 @@ static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep)
 	if (WARN_ON(PageMlocked(oldpage)))
 		goto out_fallback_unlock;
 
-	remove_from_page_cache(oldpage);
-	page_cache_release(oldpage);
-
-	err = add_to_page_cache_locked(newpage, mapping, index, GFP_KERNEL);
+	err = replace_page_cache_page(oldpage, newpage, GFP_KERNEL);
 	if (err) {
-		printk(KERN_WARNING "fuse_try_move_page: failed to add page");
-		goto out_fallback_unlock;
+		unlock_page(newpage);
+		return err;
 	}
+
 	page_cache_get(newpage);
 
 	if (!(buf->flags & PIPE_BUF_FLAG_LRU))
@@ -896,9 +902,15 @@ static int fuse_copy_args(struct fuse_copy_state *cs, unsigned numargs,
 	return err;
 }
 
+static int forget_pending(struct fuse_conn *fc)
+{
+	return fc->forget_list_head.next != NULL;
+}
+
 static int request_pending(struct fuse_conn *fc)
 {
-	return !list_empty(&fc->pending) || !list_empty(&fc->interrupts);
+	return !list_empty(&fc->pending) || !list_empty(&fc->interrupts) ||
+		forget_pending(fc);
 }
 
 /* Wait until a request is available on the pending list */
@@ -960,6 +972,120 @@ __releases(fc->lock)
 	return err ? err : reqsize;
 }
 
+static struct fuse_forget_link *dequeue_forget(struct fuse_conn *fc,
+					       unsigned max,
+					       unsigned *countp)
+{
+	struct fuse_forget_link *head = fc->forget_list_head.next;
+	struct fuse_forget_link **newhead = &head;
+	unsigned count;
+
+	for (count = 0; *newhead != NULL && count < max; count++)
+		newhead = &(*newhead)->next;
+
+	fc->forget_list_head.next = *newhead;
+	*newhead = NULL;
+	if (fc->forget_list_head.next == NULL)
+		fc->forget_list_tail = &fc->forget_list_head;
+
+	if (countp != NULL)
+		*countp = count;
+
+	return head;
+}
+
+static int fuse_read_single_forget(struct fuse_conn *fc,
+				   struct fuse_copy_state *cs,
+				   size_t nbytes)
+__releases(fc->lock)
+{
+	int err;
+	struct fuse_forget_link *forget = dequeue_forget(fc, 1, NULL);
+	struct fuse_forget_in arg = {
+		.nlookup = forget->forget_one.nlookup,
+	};
+	struct fuse_in_header ih = {
+		.opcode = FUSE_FORGET,
+		.nodeid = forget->forget_one.nodeid,
+		.unique = fuse_get_unique(fc),
+		.len = sizeof(ih) + sizeof(arg),
+	};
+
+	spin_unlock(&fc->lock);
+	kfree(forget);
+	if (nbytes < ih.len)
+		return -EINVAL;
+
+	err = fuse_copy_one(cs, &ih, sizeof(ih));
+	if (!err)
+		err = fuse_copy_one(cs, &arg, sizeof(arg));
+	fuse_copy_finish(cs);
+
+	if (err)
+		return err;
+
+	return ih.len;
+}
+
+static int fuse_read_batch_forget(struct fuse_conn *fc,
+				   struct fuse_copy_state *cs, size_t nbytes)
+__releases(fc->lock)
+{
+	int err;
+	unsigned max_forgets;
+	unsigned count;
+	struct fuse_forget_link *head;
+	struct fuse_batch_forget_in arg = { .count = 0 };
+	struct fuse_in_header ih = {
+		.opcode = FUSE_BATCH_FORGET,
+		.unique = fuse_get_unique(fc),
+		.len = sizeof(ih) + sizeof(arg),
+	};
+
+	if (nbytes < ih.len) {
+		spin_unlock(&fc->lock);
+		return -EINVAL;
+	}
+
+	max_forgets = (nbytes - ih.len) / sizeof(struct fuse_forget_one);
+	head = dequeue_forget(fc, max_forgets, &count);
+	spin_unlock(&fc->lock);
+
+	arg.count = count;
+	ih.len += count * sizeof(struct fuse_forget_one);
+	err = fuse_copy_one(cs, &ih, sizeof(ih));
+	if (!err)
+		err = fuse_copy_one(cs, &arg, sizeof(arg));
+
+	while (head) {
+		struct fuse_forget_link *forget = head;
+
+		if (!err) {
+			err = fuse_copy_one(cs, &forget->forget_one,
+					    sizeof(forget->forget_one));
+		}
+		head = forget->next;
+		kfree(forget);
+	}
+
+	fuse_copy_finish(cs);
+
+	if (err)
+		return err;
+
+	return ih.len;
+}
+
+static int fuse_read_forget(struct fuse_conn *fc, struct fuse_copy_state *cs,
+			    size_t nbytes)
+__releases(fc->lock)
+{
+	if (fc->minor < 16 || fc->forget_list_head.next->next == NULL)
+		return fuse_read_single_forget(fc, cs, nbytes);
+	else
+		return fuse_read_batch_forget(fc, cs, nbytes);
+}
+
 /*
  * Read a single request into the userspace filesystem's buffer.  This
  * function waits until a request is available, then removes it from
@@ -998,6 +1124,14 @@ static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file,
 		return fuse_read_interrupt(fc, cs, nbytes, req);
 	}
 
+	if (forget_pending(fc)) {
+		if (list_empty(&fc->pending) || fc->forget_batch-- > 0)
+			return fuse_read_forget(fc, cs, nbytes);
+
+		if (fc->forget_batch <= -8)
+			fc->forget_batch = 16;
+	}
+
 	req = list_entry(fc->pending.next, struct fuse_req, list);
 	req->state = FUSE_REQ_READING;
 	list_move(&req->list, &fc->io);
@@ -1090,7 +1224,7 @@ static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos,
 	if (!fc)
 		return -EPERM;
 
-	bufs = kmalloc(pipe->buffers * sizeof (struct pipe_buffer), GFP_KERNEL);
+	bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL);
 	if (!bufs)
 		return -ENOMEM;
 
@@ -1626,7 +1760,7 @@ static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe,
 	if (!fc)
 		return -EPERM;
 
-	bufs = kmalloc(pipe->buffers * sizeof (struct pipe_buffer), GFP_KERNEL);
+	bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL);
 	if (!bufs)
 		return -ENOMEM;
 
@@ -1770,6 +1904,23 @@ __acquires(fc->lock)
 	flush_bg_queue(fc);
 	end_requests(fc, &fc->pending);
 	end_requests(fc, &fc->processing);
+	while (forget_pending(fc))
+		kfree(dequeue_forget(fc, 1, NULL));
+}
+
+static void end_polls(struct fuse_conn *fc)
+{
+	struct rb_node *p;
+
+	p = rb_first(&fc->polled_files);
+
+	while (p) {
+		struct fuse_file *ff;
+		ff = rb_entry(p, struct fuse_file, polled_node);
+		wake_up_interruptible_all(&ff->poll_wait);
+
+		p = rb_next(p);
+	}
 }
 
 /*
@@ -1799,6 +1950,7 @@ void fuse_abort_conn(struct fuse_conn *fc)
 		fc->blocked = 0;
 		end_io_requests(fc);
 		end_queued_requests(fc);
+		end_polls(fc);
 		wake_up_all(&fc->waitq);
 		wake_up_all(&fc->blocked_waitq);
 		kill_fasync(&fc->fasync, SIGIO, POLL_IN);
@@ -1815,6 +1967,7 @@ int fuse_dev_release(struct inode *inode, struct file *file)
 		fc->connected = 0;
 		fc->blocked = 0;
 		end_queued_requests(fc);
+		end_polls(fc);
 		wake_up_all(&fc->blocked_waitq);
 		spin_unlock(&fc->lock);
 		fuse_conn_put(fc);
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index c9627c95482d..c6ba49bd95b3 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -10,9 +10,9 @@
 
 #include <linux/pagemap.h>
 #include <linux/file.h>
-#include <linux/gfp.h>
 #include <linux/sched.h>
 #include <linux/namei.h>
+#include <linux/slab.h>
 
 #if BITS_PER_LONG >= 64
 static inline void fuse_dentry_settime(struct dentry *entry, u64 time)
@@ -156,8 +156,9 @@ u64 fuse_get_attr_version(struct fuse_conn *fc)
  */
 static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
 {
-	struct inode *inode = entry->d_inode;
+	struct inode *inode;
 
+	inode = ACCESS_ONCE(entry->d_inode);
 	if (inode && is_bad_inode(inode))
 		return 0;
 	else if (fuse_dentry_time(entry) < get_jiffies_64()) {
@@ -165,7 +166,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
 		struct fuse_entry_out outarg;
 		struct fuse_conn *fc;
 		struct fuse_req *req;
-		struct fuse_req *forget_req;
+		struct fuse_forget_link *forget;
 		struct dentry *parent;
 		u64 attr_version;
 
@@ -173,13 +174,16 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
 		if (!inode)
 			return 0;
 
+		if (nd->flags & LOOKUP_RCU)
+			return -ECHILD;
+
 		fc = get_fuse_conn(inode);
 		req = fuse_get_req(fc);
 		if (IS_ERR(req))
 			return 0;
 
-		forget_req = fuse_get_req(fc);
-		if (IS_ERR(forget_req)) {
+		forget = fuse_alloc_forget();
+		if (!forget) {
 			fuse_put_request(fc, req);
 			return 0;
 		}
@@ -199,15 +203,14 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
 		if (!err) {
 			struct fuse_inode *fi = get_fuse_inode(inode);
 			if (outarg.nodeid != get_node_id(inode)) {
-				fuse_send_forget(fc, forget_req,
-						 outarg.nodeid, 1);
+				fuse_queue_forget(fc, forget, outarg.nodeid, 1);
 				return 0;
 			}
 			spin_lock(&fc->lock);
 			fi->nlookup++;
 			spin_unlock(&fc->lock);
 		}
-		fuse_put_request(fc, forget_req);
+		kfree(forget);
 		if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
 			return 0;
 
@@ -259,7 +262,7 @@ int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
 {
 	struct fuse_conn *fc = get_fuse_conn_super(sb);
 	struct fuse_req *req;
-	struct fuse_req *forget_req;
+	struct fuse_forget_link *forget;
 	u64 attr_version;
 	int err;
 
@@ -273,9 +276,9 @@ int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
 	if (IS_ERR(req))
 		goto out;
 
-	forget_req = fuse_get_req(fc);
-	err = PTR_ERR(forget_req);
-	if (IS_ERR(forget_req)) {
+	forget = fuse_alloc_forget();
+	err = -ENOMEM;
+	if (!forget) {
 		fuse_put_request(fc, req);
 		goto out;
 	}
@@ -301,13 +304,13 @@ int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
 			   attr_version);
 	err = -ENOMEM;
 	if (!*inode) {
-		fuse_send_forget(fc, forget_req, outarg->nodeid, 1);
+		fuse_queue_forget(fc, forget, outarg->nodeid, 1);
 		goto out;
 	}
 	err = 0;
 
  out_put_forget:
-	fuse_put_request(fc, forget_req);
+	kfree(forget);
  out:
 	return err;
 }
@@ -347,7 +350,6 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
 	}
 
 	entry = newent ? newent : entry;
-	entry->d_op = &fuse_dentry_operations;
 	if (outarg_valid)
 		fuse_change_entry_timeout(entry, &outarg);
 	else
@@ -374,7 +376,7 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
 	struct inode *inode;
 	struct fuse_conn *fc = get_fuse_conn(dir);
 	struct fuse_req *req;
-	struct fuse_req *forget_req;
+	struct fuse_forget_link *forget;
 	struct fuse_create_in inarg;
 	struct fuse_open_out outopen;
 	struct fuse_entry_out outentry;
@@ -388,9 +390,9 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
 	if (flags & O_DIRECT)
 		return -EINVAL;
 
-	forget_req = fuse_get_req(fc);
-	if (IS_ERR(forget_req))
-		return PTR_ERR(forget_req);
+	forget = fuse_alloc_forget();
+	if (!forget)
+		return -ENOMEM;
 
 	req = fuse_get_req(fc);
 	err = PTR_ERR(req);
@@ -448,10 +450,10 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
 	if (!inode) {
 		flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
 		fuse_sync_release(ff, flags);
-		fuse_send_forget(fc, forget_req, outentry.nodeid, 1);
+		fuse_queue_forget(fc, forget, outentry.nodeid, 1);
 		return -ENOMEM;
 	}
-	fuse_put_request(fc, forget_req);
+	kfree(forget);
 	d_instantiate(entry, inode);
 	fuse_change_entry_timeout(entry, &outentry);
 	fuse_invalidate_attr(dir);
@@ -469,7 +471,7 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
  out_put_request:
 	fuse_put_request(fc, req);
  out_put_forget_req:
-	fuse_put_request(fc, forget_req);
+	kfree(forget);
 	return err;
 }
 
@@ -483,12 +485,12 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
 	struct fuse_entry_out outarg;
 	struct inode *inode;
 	int err;
-	struct fuse_req *forget_req;
+	struct fuse_forget_link *forget;
 
-	forget_req = fuse_get_req(fc);
-	if (IS_ERR(forget_req)) {
+	forget = fuse_alloc_forget();
+	if (!forget) {
 		fuse_put_request(fc, req);
-		return PTR_ERR(forget_req);
+		return -ENOMEM;
 	}
 
 	memset(&outarg, 0, sizeof(outarg));
@@ -515,10 +517,10 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
 	inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
 			  &outarg.attr, entry_attr_timeout(&outarg), 0);
 	if (!inode) {
-		fuse_send_forget(fc, forget_req, outarg.nodeid, 1);
+		fuse_queue_forget(fc, forget, outarg.nodeid, 1);
 		return -ENOMEM;
 	}
-	fuse_put_request(fc, forget_req);
+	kfree(forget);
 
 	if (S_ISDIR(inode->i_mode)) {
 		struct dentry *alias;
@@ -541,7 +543,7 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
 	return 0;
 
  out_put_forget_req:
-	fuse_put_request(fc, forget_req);
+	kfree(forget);
 	return err;
 }
 
@@ -968,6 +970,14 @@ static int fuse_access(struct inode *inode, int mask)
 	return err;
 }
 
+static int fuse_perm_getattr(struct inode *inode, int flags)
+{
+	if (flags & IPERM_FLAG_RCU)
+		return -ECHILD;
+
+	return fuse_do_getattr(inode, NULL, NULL);
+}
+
 /*
  * Check permission.  The two basic access models of FUSE are:
  *
@@ -981,7 +991,7 @@ static int fuse_access(struct inode *inode, int mask)
  * access request is sent.  Execute permission is still checked
  * locally based on file mode.
  */
-static int fuse_permission(struct inode *inode, int mask)
+static int fuse_permission(struct inode *inode, int mask, unsigned int flags)
 {
 	struct fuse_conn *fc = get_fuse_conn(inode);
 	bool refreshed = false;
@@ -995,21 +1005,28 @@ static int fuse_permission(struct inode *inode, int mask)
 	 */
 	if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) ||
 	    ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
-		err = fuse_update_attributes(inode, NULL, NULL, &refreshed);
-		if (err)
-			return err;
+		struct fuse_inode *fi = get_fuse_inode(inode);
+
+		if (fi->i_time < get_jiffies_64()) {
+			refreshed = true;
+
+			err = fuse_perm_getattr(inode, flags);
+			if (err)
+				return err;
+		}
 	}
 
 	if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
-		err = generic_permission(inode, mask, NULL);
+		err = generic_permission(inode, mask, flags, NULL);
 
 		/* If permission is denied, try to refresh file
 		   attributes.  This is also needed, because the root
 		   node will at first have no permissions */
 		if (err == -EACCES && !refreshed) {
-			err = fuse_do_getattr(inode, NULL, NULL);
+			err = fuse_perm_getattr(inode, flags);
 			if (!err)
-				err = generic_permission(inode, mask, NULL);
+				err = generic_permission(inode, mask,
+							flags, NULL);
 		}
 
 		/* Note: the opposite of the above test does not
@@ -1017,13 +1034,16 @@ static int fuse_permission(struct inode *inode, int mask)
 		   noticed immediately, only after the attribute
 		   timeout has expired */
 	} else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
+		if (flags & IPERM_FLAG_RCU)
+			return -ECHILD;
+
 		err = fuse_access(inode, mask);
 	} else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
 		if (!(inode->i_mode & S_IXUGO)) {
 			if (refreshed)
 				return -EACCES;
 
-			err = fuse_do_getattr(inode, NULL, NULL);
+			err = fuse_perm_getattr(inode, flags);
 			if (!err && !(inode->i_mode & S_IXUGO))
 				return -EACCES;
 		}
@@ -1277,8 +1297,11 @@ static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
 	if (err)
 		return err;
 
-	if ((attr->ia_valid & ATTR_OPEN) && fc->atomic_o_trunc)
-		return 0;
+	if (attr->ia_valid & ATTR_OPEN) {
+		if (fc->atomic_o_trunc)
+			return 0;
+		file = NULL;
+	}
 
 	if (attr->ia_valid & ATTR_SIZE)
 		is_truncate = true;
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 9242d294fe90..82a66466a24c 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -13,6 +13,7 @@
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/module.h>
+#include <linux/compat.h>
 
 static const struct file_operations fuse_direct_io_file_operations;
 
@@ -85,18 +86,52 @@ struct fuse_file *fuse_file_get(struct fuse_file *ff)
 	return ff;
 }
 
+static void fuse_release_async(struct work_struct *work)
+{
+	struct fuse_req *req;
+	struct fuse_conn *fc;
+	struct path path;
+
+	req = container_of(work, struct fuse_req, misc.release.work);
+	path = req->misc.release.path;
+	fc = get_fuse_conn(path.dentry->d_inode);
+
+	fuse_put_request(fc, req);
+	path_put(&path);
+}
+
 static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req)
 {
-	path_put(&req->misc.release.path);
+	if (fc->destroy_req) {
+		/*
+		 * If this is a fuseblk mount, then it's possible that
+		 * releasing the path will result in releasing the
+		 * super block and sending the DESTROY request.  If
+		 * the server is single threaded, this would hang.
+		 * For this reason do the path_put() in a separate
+		 * thread.
+		 */
+		atomic_inc(&req->count);
+		INIT_WORK(&req->misc.release.work, fuse_release_async);
+		schedule_work(&req->misc.release.work);
+	} else {
+		path_put(&req->misc.release.path);
+	}
 }
 
-static void fuse_file_put(struct fuse_file *ff)
+static void fuse_file_put(struct fuse_file *ff, bool sync)
 {
 	if (atomic_dec_and_test(&ff->count)) {
 		struct fuse_req *req = ff->reserved_req;
 
-		req->end = fuse_release_end;
-		fuse_request_send_background(ff->fc, req);
+		if (sync) {
+			fuse_request_send(ff->fc, req);
+			path_put(&req->misc.release.path);
+			fuse_put_request(ff->fc, req);
+		} else {
+			req->end = fuse_release_end;
+			fuse_request_send_background(ff->fc, req);
+		}
 		kfree(ff);
 	}
 }
@@ -187,7 +222,7 @@ static void fuse_prepare_release(struct fuse_file *ff, int flags, int opcode)
 		rb_erase(&ff->polled_node, &fc->polled_files);
 	spin_unlock(&fc->lock);
 
-	wake_up_interruptible_sync(&ff->poll_wait);
+	wake_up_interruptible_all(&ff->poll_wait);
 
 	inarg->fh = ff->fh;
 	inarg->flags = flags;
@@ -218,8 +253,12 @@ void fuse_release_common(struct file *file, int opcode)
 	 * Normally this will send the RELEASE request, however if
 	 * some asynchronous READ or WRITE requests are outstanding,
 	 * the sending will be delayed.
+	 *
+	 * Make the release synchronous if this is a fuseblk mount,
+	 * synchronous RELEASE is allowed (and desirable) in this case
+	 * because the server can be trusted not to screw up.
 	 */
-	fuse_file_put(ff);
+	fuse_file_put(ff, ff->fc->destroy_req != NULL);
 }
 
 static int fuse_open(struct inode *inode, struct file *file)
@@ -484,7 +523,7 @@ static int fuse_readpage(struct file *file, struct page *page)
 		goto out;
 
 	/*
-	 * Page writeback can extend beyond the liftime of the
+	 * Page writeback can extend beyond the lifetime of the
 	 * page-cache page, so make sure we read a properly synced
 	 * page.
 	 */
@@ -557,7 +596,7 @@ static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
 		page_cache_release(page);
 	}
 	if (req->ff)
-		fuse_file_put(req->ff);
+		fuse_file_put(req->ff, false);
 }
 
 static void fuse_send_readpages(struct fuse_req *req, struct file *file)
@@ -1136,7 +1175,7 @@ static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
 static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req)
 {
 	__free_page(req->pages[0]);
-	fuse_file_put(req->ff);
+	fuse_file_put(req->ff, false);
 }
 
 static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req)
@@ -1628,6 +1667,94 @@ static int fuse_ioctl_copy_user(struct page **pages, struct iovec *iov,
 }
 
 /*
+ * CUSE servers compiled on 32bit broke on 64bit kernels because the
+ * ABI was defined to be 'struct iovec' which is different on 32bit
+ * and 64bit.  Fortunately we can determine which structure the server
+ * used from the size of the reply.
+ */
+static int fuse_copy_ioctl_iovec_old(struct iovec *dst, void *src,
+				     size_t transferred, unsigned count,
+				     bool is_compat)
+{
+#ifdef CONFIG_COMPAT
+	if (count * sizeof(struct compat_iovec) == transferred) {
+		struct compat_iovec *ciov = src;
+		unsigned i;
+
+		/*
+		 * With this interface a 32bit server cannot support
+		 * non-compat (i.e. ones coming from 64bit apps) ioctl
+		 * requests
+		 */
+		if (!is_compat)
+			return -EINVAL;
+
+		for (i = 0; i < count; i++) {
+			dst[i].iov_base = compat_ptr(ciov[i].iov_base);
+			dst[i].iov_len = ciov[i].iov_len;
+		}
+		return 0;
+	}
+#endif
+
+	if (count * sizeof(struct iovec) != transferred)
+		return -EIO;
+
+	memcpy(dst, src, transferred);
+	return 0;
+}
+
+/* Make sure iov_length() won't overflow */
+static int fuse_verify_ioctl_iov(struct iovec *iov, size_t count)
+{
+	size_t n;
+	u32 max = FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT;
+
+	for (n = 0; n < count; n++) {
+		if (iov->iov_len > (size_t) max)
+			return -ENOMEM;
+		max -= iov->iov_len;
+	}
+	return 0;
+}
+
+static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst,
+				 void *src, size_t transferred, unsigned count,
+				 bool is_compat)
+{
+	unsigned i;
+	struct fuse_ioctl_iovec *fiov = src;
+
+	if (fc->minor < 16) {
+		return fuse_copy_ioctl_iovec_old(dst, src, transferred,
+						 count, is_compat);
+	}
+
+	if (count * sizeof(struct fuse_ioctl_iovec) != transferred)
+		return -EIO;
+
+	for (i = 0; i < count; i++) {
+		/* Did the server supply an inappropriate value? */
+		if (fiov[i].base != (unsigned long) fiov[i].base ||
+		    fiov[i].len != (unsigned long) fiov[i].len)
+			return -EIO;
+
+		dst[i].iov_base = (void __user *) (unsigned long) fiov[i].base;
+		dst[i].iov_len = (size_t) fiov[i].len;
+
+#ifdef CONFIG_COMPAT
+		if (is_compat &&
+		    (ptr_to_compat(dst[i].iov_base) != fiov[i].base ||
+		     (compat_size_t) dst[i].iov_len != fiov[i].len))
+			return -EIO;
+#endif
+	}
+
+	return 0;
+}
+
+
+/*
  * For ioctls, there is no generic way to determine how much memory
  * needs to be read and/or written.  Furthermore, ioctls are allowed
  * to dereference the passed pointer, so the parameter requires deep
@@ -1687,18 +1814,25 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
 	struct fuse_ioctl_out outarg;
 	struct fuse_req *req = NULL;
 	struct page **pages = NULL;
-	struct page *iov_page = NULL;
+	struct iovec *iov_page = NULL;
 	struct iovec *in_iov = NULL, *out_iov = NULL;
 	unsigned int in_iovs = 0, out_iovs = 0, num_pages = 0, max_pages;
 	size_t in_size, out_size, transferred;
 	int err;
 
+#if BITS_PER_LONG == 32
+	inarg.flags |= FUSE_IOCTL_32BIT;
+#else
+	if (flags & FUSE_IOCTL_COMPAT)
+		inarg.flags |= FUSE_IOCTL_32BIT;
+#endif
+
 	/* assume all the iovs returned by client always fits in a page */
-	BUILD_BUG_ON(sizeof(struct iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE);
+	BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE);
 
 	err = -ENOMEM;
 	pages = kzalloc(sizeof(pages[0]) * FUSE_MAX_PAGES_PER_REQ, GFP_KERNEL);
-	iov_page = alloc_page(GFP_KERNEL);
+	iov_page = (struct iovec *) __get_free_page(GFP_KERNEL);
 	if (!pages || !iov_page)
 		goto out;
 
@@ -1707,7 +1841,7 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
 	 * RETRY from server is not allowed.
 	 */
 	if (!(flags & FUSE_IOCTL_UNRESTRICTED)) {
-		struct iovec *iov = page_address(iov_page);
+		struct iovec *iov = iov_page;
 
 		iov->iov_base = (void __user *)arg;
 		iov->iov_len = _IOC_SIZE(cmd);
@@ -1788,7 +1922,7 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
 
 	/* did it ask for retry? */
 	if (outarg.flags & FUSE_IOCTL_RETRY) {
-		char *vaddr;
+		void *vaddr;
 
 		/* no retry if in restricted mode */
 		err = -EIO;
@@ -1808,18 +1942,25 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
 		    in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV)
 			goto out;
 
-		err = -EIO;
-		if ((in_iovs + out_iovs) * sizeof(struct iovec) != transferred)
-			goto out;
-
-		/* okay, copy in iovs and retry */
 		vaddr = kmap_atomic(pages[0], KM_USER0);
-		memcpy(page_address(iov_page), vaddr, transferred);
+		err = fuse_copy_ioctl_iovec(fc, iov_page, vaddr,
+					    transferred, in_iovs + out_iovs,
+					    (flags & FUSE_IOCTL_COMPAT) != 0);
 		kunmap_atomic(vaddr, KM_USER0);
+		if (err)
+			goto out;
 
-		in_iov = page_address(iov_page);
+		in_iov = iov_page;
 		out_iov = in_iov + in_iovs;
 
+		err = fuse_verify_ioctl_iov(in_iov, in_iovs);
+		if (err)
+			goto out;
+
+		err = fuse_verify_ioctl_iov(out_iov, out_iovs);
+		if (err)
+			goto out;
+
 		goto retry;
 	}
 
@@ -1831,8 +1972,7 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
  out:
 	if (req)
 		fuse_put_request(fc, req);
-	if (iov_page)
-		__free_page(iov_page);
+	free_page((unsigned long) iov_page);
 	while (num_pages)
 		__free_page(pages[--num_pages]);
 	kfree(pages);
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 57d4a3a0f102..b788becada76 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -21,6 +21,7 @@
 #include <linux/rwsem.h>
 #include <linux/rbtree.h>
 #include <linux/poll.h>
+#include <linux/workqueue.h>
 
 /** Max number of pages that can be used in a single read request */
 #define FUSE_MAX_PAGES_PER_REQ 32
@@ -53,6 +54,12 @@ extern struct mutex fuse_mutex;
 extern unsigned max_user_bgreq;
 extern unsigned max_user_congthresh;
 
+/* One forget request */
+struct fuse_forget_link {
+	struct fuse_forget_one forget_one;
+	struct fuse_forget_link *next;
+};
+
 /** FUSE inode */
 struct fuse_inode {
 	/** Inode data */
@@ -66,7 +73,7 @@ struct fuse_inode {
 	u64 nlookup;
 
 	/** The request used for sending the FORGET message */
-	struct fuse_req *forget_req;
+	struct fuse_forget_link *forget;
 
 	/** Time in jiffies until the file attributes are valid */
 	u64 i_time;
@@ -255,15 +262,16 @@ struct fuse_req {
 
 	/** Data for asynchronous requests */
 	union {
-		struct fuse_forget_in forget_in;
 		struct {
-			struct fuse_release_in in;
+			union {
+				struct fuse_release_in in;
+				struct work_struct work;
+			};
 			struct path path;
 		} release;
 		struct fuse_init_in init_in;
 		struct fuse_init_out init_out;
 		struct cuse_init_in cuse_init_in;
-		struct cuse_init_out cuse_init_out;
 		struct {
 			struct fuse_read_in in;
 			u64 attr_ver;
@@ -369,6 +377,13 @@ struct fuse_conn {
 	/** Pending interrupts */
 	struct list_head interrupts;
 
+	/** Queue of pending forgets */
+	struct fuse_forget_link forget_list_head;
+	struct fuse_forget_link *forget_list_tail;
+
+	/** Batching of FORGET requests (positive indicates FORGET batch) */
+	int forget_batch;
+
 	/** Flag indicating if connection is blocked.  This will be
 	    the case before the INIT reply is received, and if there
 	    are too many outstading backgrounds requests */
@@ -543,8 +558,10 @@ int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
 /**
  * Send FORGET command
  */
-void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
-		      u64 nodeid, u64 nlookup);
+void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
+		       u64 nodeid, u64 nlookup);
+
+struct fuse_forget_link *fuse_alloc_forget(void);
 
 /**
  * Initialize READ or READDIR request
@@ -656,11 +673,6 @@ void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req);
 void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req);
 
 /**
- * Send a request with no reply
- */
-void fuse_request_send_noreply(struct fuse_conn *fc, struct fuse_req *req);
-
-/**
  * Send a request in the background
  */
 void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req);
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index cfce3ad86a92..cc6ec4b2f0ff 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -71,6 +71,11 @@ struct fuse_mount_data {
 	unsigned blksize;
 };
 
+struct fuse_forget_link *fuse_alloc_forget()
+{
+	return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL);
+}
+
 static struct inode *fuse_alloc_inode(struct super_block *sb)
 {
 	struct inode *inode;
@@ -90,8 +95,8 @@ static struct inode *fuse_alloc_inode(struct super_block *sb)
 	INIT_LIST_HEAD(&fi->queued_writes);
 	INIT_LIST_HEAD(&fi->writepages);
 	init_waitqueue_head(&fi->page_waitq);
-	fi->forget_req = fuse_request_alloc();
-	if (!fi->forget_req) {
+	fi->forget = fuse_alloc_forget();
+	if (!fi->forget) {
 		kmem_cache_free(fuse_inode_cachep, inode);
 		return NULL;
 	}
@@ -99,27 +104,20 @@ static struct inode *fuse_alloc_inode(struct super_block *sb)
 	return inode;
 }
 
-static void fuse_destroy_inode(struct inode *inode)
+static void fuse_i_callback(struct rcu_head *head)
 {
-	struct fuse_inode *fi = get_fuse_inode(inode);
-	BUG_ON(!list_empty(&fi->write_files));
-	BUG_ON(!list_empty(&fi->queued_writes));
-	if (fi->forget_req)
-		fuse_request_free(fi->forget_req);
+	struct inode *inode = container_of(head, struct inode, i_rcu);
+	INIT_LIST_HEAD(&inode->i_dentry);
 	kmem_cache_free(fuse_inode_cachep, inode);
 }
 
-void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
-		      u64 nodeid, u64 nlookup)
+static void fuse_destroy_inode(struct inode *inode)
 {
-	struct fuse_forget_in *inarg = &req->misc.forget_in;
-	inarg->nlookup = nlookup;
-	req->in.h.opcode = FUSE_FORGET;
-	req->in.h.nodeid = nodeid;
-	req->in.numargs = 1;
-	req->in.args[0].size = sizeof(struct fuse_forget_in);
-	req->in.args[0].value = inarg;
-	fuse_request_send_noreply(fc, req);
+	struct fuse_inode *fi = get_fuse_inode(inode);
+	BUG_ON(!list_empty(&fi->write_files));
+	BUG_ON(!list_empty(&fi->queued_writes));
+	kfree(fi->forget);
+	call_rcu(&inode->i_rcu, fuse_i_callback);
 }
 
 static void fuse_evict_inode(struct inode *inode)
@@ -129,8 +127,8 @@ static void fuse_evict_inode(struct inode *inode)
 	if (inode->i_sb->s_flags & MS_ACTIVE) {
 		struct fuse_conn *fc = get_fuse_conn(inode);
 		struct fuse_inode *fi = get_fuse_inode(inode);
-		fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
-		fi->forget_req = NULL;
+		fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup);
+		fi->forget = NULL;
 	}
 }
 
@@ -534,6 +532,7 @@ void fuse_conn_init(struct fuse_conn *fc)
 	INIT_LIST_HEAD(&fc->interrupts);
 	INIT_LIST_HEAD(&fc->bg_queue);
 	INIT_LIST_HEAD(&fc->entry);
+	fc->forget_list_tail = &fc->forget_list_head;
 	atomic_set(&fc->num_waiting, 0);
 	fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;
 	fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;
@@ -618,10 +617,8 @@ static struct dentry *fuse_get_dentry(struct super_block *sb,
 		goto out_iput;
 
 	entry = d_obtain_alias(inode);
-	if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) {
-		entry->d_op = &fuse_dentry_operations;
+	if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID)
 		fuse_invalidate_entry_cache(entry);
-	}
 
 	return entry;
 
@@ -640,8 +637,10 @@ static int fuse_encode_fh(struct dentry *dentry, u32 *fh, int *max_len,
 	u64 nodeid;
 	u32 generation;
 
-	if (*max_len < len)
+	if (*max_len < len) {
+		*max_len = len;
 		return  255;
+	}
 
 	nodeid = get_fuse_inode(inode)->nodeid;
 	generation = inode->i_generation;
@@ -720,10 +719,8 @@ static struct dentry *fuse_get_parent(struct dentry *child)
 	}
 
 	parent = d_obtain_alias(inode);
-	if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) {
-		parent->d_op = &fuse_dentry_operations;
+	if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID)
 		fuse_invalidate_entry_cache(parent);
-	}
 
 	return parent;
 }
@@ -873,7 +870,6 @@ static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
 
 	fc->bdi.name = "fuse";
 	fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
-	fc->bdi.unplug_io_fn = default_unplug_io_fn;
 	/* fuse does it's own writeback accounting */
 	fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;
 
@@ -990,6 +986,8 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
 		iput(root);
 		goto err_put_conn;
 	}
+	/* only now - we want root dentry with NULL ->d_op */
+	sb->s_d_op = &fuse_dentry_operations;
 
 	init_req = fuse_request_alloc();
 	if (!init_req)