5 files changed, 278 insertions, 151 deletions

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 8f873e621f4..e08ab4702d9 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -148,6 +148,26 @@ void fuse_release_background(struct fuse_req *req)
 	spin_unlock(&fuse_lock);
 }
 
+static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
+{
+	int i;
+	struct fuse_init_out *arg = &req->misc.init_out;
+
+	if (arg->major != FUSE_KERNEL_VERSION)
+		fc->conn_error = 1;
+	else {
+		fc->minor = arg->minor;
+		fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
+	}
+
+	/* After INIT reply is received other requests can go
+	   out.  So do (FUSE_MAX_OUTSTANDING - 1) number of
+	   up()s on outstanding_sem.  The last up() is done in
+	   fuse_putback_request() */
+	for (i = 1; i < FUSE_MAX_OUTSTANDING; i++)
+		up(&fc->outstanding_sem);
+}
+
 /*
  * This function is called when a request is finished.  Either a reply
  * has arrived or it was interrupted (and not yet sent) or some error
@@ -172,19 +192,9 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req)
 		up_read(&fc->sbput_sem);
 	}
 	wake_up(&req->waitq);
-	if (req->in.h.opcode == FUSE_INIT) {
-		int i;
-
-		if (req->misc.init_in_out.major != FUSE_KERNEL_VERSION)
-			fc->conn_error = 1;
-
-		/* After INIT reply is received other requests can go
-		   out.  So do (FUSE_MAX_OUTSTANDING - 1) number of
-		   up()s on outstanding_sem.  The last up() is done in
-		   fuse_putback_request() */
-		for (i = 1; i < FUSE_MAX_OUTSTANDING; i++)
-			up(&fc->outstanding_sem);
-	} else if (req->in.h.opcode == FUSE_RELEASE && req->inode == NULL) {
+	if (req->in.h.opcode == FUSE_INIT)
+		process_init_reply(fc, req);
+	else if (req->in.h.opcode == FUSE_RELEASE && req->inode == NULL) {
 		/* Special case for failed iget in CREATE */
 		u64 nodeid = req->in.h.nodeid;
 		__fuse_get_request(req);
@@ -357,7 +367,7 @@ void fuse_send_init(struct fuse_conn *fc)
 	/* This is called from fuse_read_super() so there's guaranteed
 	   to be a request available */
 	struct fuse_req *req = do_get_request(fc);
-	struct fuse_init_in_out *arg = &req->misc.init_in_out;
+	struct fuse_init_in *arg = &req->misc.init_in;
 	arg->major = FUSE_KERNEL_VERSION;
 	arg->minor = FUSE_KERNEL_MINOR_VERSION;
 	req->in.h.opcode = FUSE_INIT;
@@ -365,8 +375,12 @@ void fuse_send_init(struct fuse_conn *fc)
 	req->in.args[0].size = sizeof(*arg);
 	req->in.args[0].value = arg;
 	req->out.numargs = 1;
-	req->out.args[0].size = sizeof(*arg);
-	req->out.args[0].value = arg;
+	/* Variable length arguement used for backward compatibility
+	   with interface version < 7.5.  Rest of init_out is zeroed
+	   by do_get_request(), so a short reply is not a problem */
+	req->out.argvar = 1;
+	req->out.args[0].size = sizeof(struct fuse_init_out);
+	req->out.args[0].value = &req->misc.init_out;
 	request_send_background(fc, req);
 }
 
@@ -615,6 +629,7 @@ static ssize_t fuse_dev_readv(struct file *file, const struct iovec *iov,
 	struct fuse_copy_state cs;
 	unsigned reqsize;
 
+ restart:
 	spin_lock(&fuse_lock);
 	fc = file->private_data;
 	err = -EPERM;
@@ -630,20 +645,25 @@ static ssize_t fuse_dev_readv(struct file *file, const struct iovec *iov,
 
 	req = list_entry(fc->pending.next, struct fuse_req, list);
 	list_del_init(&req->list);
-	spin_unlock(&fuse_lock);
 
 	in = &req->in;
-	reqsize = req->in.h.len;
-	fuse_copy_init(&cs, 1, req, iov, nr_segs);
-	err = -EINVAL;
-	if (iov_length(iov, nr_segs) >= reqsize) {
-		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);
+	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(&fuse_lock);
+	fuse_copy_init(&cs, 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(&fuse_lock);
 	req->locked = 0;
 	if (!err && req->interrupted)
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 51f5da65277..417bcee466f 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -13,8 +13,16 @@
 #include <linux/gfp.h>
 #include <linux/sched.h>
 #include <linux/namei.h>
-#include <linux/mount.h>
 
+/*
+ * FUSE caches dentries and attributes with separate timeout.  The
+ * time in jiffies until the dentry/attributes are valid is stored in
+ * dentry->d_time and fuse_inode->i_time respectively.
+ */
+
+/*
+ * Calculate the time in jiffies until a dentry/attributes are valid
+ */
 static inline unsigned long time_to_jiffies(unsigned long sec,
 					    unsigned long nsec)
 {
@@ -22,6 +30,50 @@ static inline unsigned long time_to_jiffies(unsigned long sec,
 	return jiffies + timespec_to_jiffies(&ts);
 }
 
+/*
+ * Set dentry and possibly attribute timeouts from the lookup/mk*
+ * replies
+ */
+static void fuse_change_timeout(struct dentry *entry, struct fuse_entry_out *o)
+{
+	entry->d_time = time_to_jiffies(o->entry_valid, o->entry_valid_nsec);
+	if (entry->d_inode)
+		get_fuse_inode(entry->d_inode)->i_time =
+			time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
+}
+
+/*
+ * Mark the attributes as stale, so that at the next call to
+ * ->getattr() they will be fetched from userspace
+ */
+void fuse_invalidate_attr(struct inode *inode)
+{
+	get_fuse_inode(inode)->i_time = jiffies - 1;
+}
+
+/*
+ * Just mark the entry as stale, so that a next attempt to look it up
+ * will result in a new lookup call to userspace
+ *
+ * This is called when a dentry is about to become negative and the
+ * timeout is unknown (unlink, rmdir, rename and in some cases
+ * lookup)
+ */
+static void fuse_invalidate_entry_cache(struct dentry *entry)
+{
+	entry->d_time = jiffies - 1;
+}
+
+/*
+ * Same as fuse_invalidate_entry_cache(), but also try to remove the
+ * dentry from the hash
+ */
+static void fuse_invalidate_entry(struct dentry *entry)
+{
+	d_invalidate(entry);
+	fuse_invalidate_entry_cache(entry);
+}
+
 static void fuse_lookup_init(struct fuse_req *req, struct inode *dir,
 			     struct dentry *entry,
 			     struct fuse_entry_out *outarg)
@@ -37,17 +89,34 @@ static void fuse_lookup_init(struct fuse_req *req, struct inode *dir,
 	req->out.args[0].value = outarg;
 }
 
+/*
+ * Check whether the dentry is still valid
+ *
+ * If the entry validity timeout has expired and the dentry is
+ * positive, try to redo the lookup.  If the lookup results in a
+ * different inode, then let the VFS invalidate the dentry and redo
+ * the lookup once more.  If the lookup results in the same inode,
+ * then refresh the attributes, timeouts and mark the dentry valid.
+ */
 static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
 {
-	if (!entry->d_inode || is_bad_inode(entry->d_inode))
+	struct inode *inode = entry->d_inode;
+
+	if (inode && is_bad_inode(inode))
 		return 0;
 	else if (time_after(jiffies, entry->d_time)) {
 		int err;
 		struct fuse_entry_out outarg;
-		struct inode *inode = entry->d_inode;
-		struct fuse_inode *fi = get_fuse_inode(inode);
-		struct fuse_conn *fc = get_fuse_conn(inode);
-		struct fuse_req *req = fuse_get_request(fc);
+		struct fuse_conn *fc;
+		struct fuse_req *req;
+
+		/* Doesn't hurt to "reset" the validity timeout */
+		fuse_invalidate_entry_cache(entry);
+		if (!inode)
+			return 0;
+
+		fc = get_fuse_conn(inode);
+		req = fuse_get_request(fc);
 		if (!req)
 			return 0;
 
@@ -55,6 +124,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
 		request_send(fc, req);
 		err = req->out.h.error;
 		if (!err) {
+			struct fuse_inode *fi = get_fuse_inode(inode);
 			if (outarg.nodeid != get_node_id(inode)) {
 				fuse_send_forget(fc, req, outarg.nodeid, 1);
 				return 0;
@@ -66,18 +136,18 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
 			return 0;
 
 		fuse_change_attributes(inode, &outarg.attr);
-		entry->d_time = time_to_jiffies(outarg.entry_valid,
-						outarg.entry_valid_nsec);
-		fi->i_time = time_to_jiffies(outarg.attr_valid,
-					     outarg.attr_valid_nsec);
+		fuse_change_timeout(entry, &outarg);
 	}
 	return 1;
 }
 
+/*
+ * Check if there's already a hashed alias of this directory inode.
+ * If yes, then lookup and mkdir must not create a new alias.
+ */
 static int dir_alias(struct inode *inode)
 {
 	if (S_ISDIR(inode->i_mode)) {
-		/* Don't allow creating an alias to a directory  */
 		struct dentry *alias = d_find_alias(inode);
 		if (alias) {
 			dput(alias);
@@ -96,8 +166,14 @@ static struct dentry_operations fuse_dentry_operations = {
 	.d_revalidate	= fuse_dentry_revalidate,
 };
 
-static int fuse_lookup_iget(struct inode *dir, struct dentry *entry,
-			    struct inode **inodep)
+static inline int valid_mode(int m)
+{
+	return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) ||
+		S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m);
+}
+
+static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
+				  struct nameidata *nd)
 {
 	int err;
 	struct fuse_entry_out outarg;
@@ -106,53 +182,49 @@ static int fuse_lookup_iget(struct inode *dir, struct dentry *entry,
 	struct fuse_req *req;
 
 	if (entry->d_name.len > FUSE_NAME_MAX)
-		return -ENAMETOOLONG;
+		return ERR_PTR(-ENAMETOOLONG);
 
 	req = fuse_get_request(fc);
 	if (!req)
-		return -EINTR;
+		return ERR_PTR(-EINTR);
 
 	fuse_lookup_init(req, dir, entry, &outarg);
 	request_send(fc, req);
 	err = req->out.h.error;
-	if (!err && invalid_nodeid(outarg.nodeid))
+	if (!err && ((outarg.nodeid && invalid_nodeid(outarg.nodeid)) ||
+		     !valid_mode(outarg.attr.mode)))
 		err = -EIO;
-	if (!err) {
+	if (!err && outarg.nodeid) {
 		inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
 				  &outarg.attr);
 		if (!inode) {
 			fuse_send_forget(fc, req, outarg.nodeid, 1);
-			return -ENOMEM;
+			return ERR_PTR(-ENOMEM);
 		}
 	}
 	fuse_put_request(fc, req);
 	if (err && err != -ENOENT)
-		return err;
+		return ERR_PTR(err);
 
-	if (inode) {
-		struct fuse_inode *fi = get_fuse_inode(inode);
-		entry->d_time =	time_to_jiffies(outarg.entry_valid,
-						outarg.entry_valid_nsec);
-		fi->i_time = time_to_jiffies(outarg.attr_valid,
-					     outarg.attr_valid_nsec);
+	if (inode && dir_alias(inode)) {
+		iput(inode);
+		return ERR_PTR(-EIO);
 	}
-
+	d_add(entry, inode);
 	entry->d_op = &fuse_dentry_operations;
-	*inodep = inode;
-	return 0;
-}
-
-void fuse_invalidate_attr(struct inode *inode)
-{
-	get_fuse_inode(inode)->i_time = jiffies - 1;
-}
-
-static void fuse_invalidate_entry(struct dentry *entry)
-{
-	d_invalidate(entry);
-	entry->d_time = jiffies - 1;
+	if (!err)
+		fuse_change_timeout(entry, &outarg);
+	else
+		fuse_invalidate_entry_cache(entry);
+	return NULL;
 }
 
+/*
+ * Atomic create+open operation
+ *
+ * If the filesystem doesn't support this, then fall back to separate
+ * 'mknod' + 'open' requests.
+ */
 static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
 			    struct nameidata *nd)
 {
@@ -163,7 +235,6 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
 	struct fuse_open_in inarg;
 	struct fuse_open_out outopen;
 	struct fuse_entry_out outentry;
-	struct fuse_inode *fi;
 	struct fuse_file *ff;
 	struct file *file;
 	int flags = nd->intent.open.flags - 1;
@@ -172,10 +243,6 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
 	if (fc->no_create)
 		goto out;
 
-	err = -ENAMETOOLONG;
-	if (entry->d_name.len > FUSE_NAME_MAX)
-		goto out;
-
 	err = -EINTR;
 	req = fuse_get_request(fc);
 	if (!req)
@@ -220,17 +287,15 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
 	if (!inode) {
 		flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
 		ff->fh = outopen.fh;
+		/* Special release, with inode = NULL, this will
+		   trigger a 'forget' request when the release is
+		   complete */
 		fuse_send_release(fc, ff, outentry.nodeid, NULL, flags, 0);
 		goto out_put_request;
 	}
 	fuse_put_request(fc, req);
-	entry->d_time =	time_to_jiffies(outentry.entry_valid,
-					outentry.entry_valid_nsec);
-	fi = get_fuse_inode(inode);
-	fi->i_time = time_to_jiffies(outentry.attr_valid,
-				     outentry.attr_valid_nsec);
-
 	d_instantiate(entry, inode);
+	fuse_change_timeout(entry, &outentry);
 	file = lookup_instantiate_filp(nd, entry, generic_file_open);
 	if (IS_ERR(file)) {
 		ff->fh = outopen.fh;
@@ -248,13 +313,15 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
 	return err;
 }
 
+/*
+ * Code shared between mknod, mkdir, symlink and link
+ */
 static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
 			    struct inode *dir, struct dentry *entry,
 			    int mode)
 {
 	struct fuse_entry_out outarg;
 	struct inode *inode;
-	struct fuse_inode *fi;
 	int err;
 
 	req->in.h.nodeid = get_node_id(dir);
@@ -268,10 +335,13 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
 		fuse_put_request(fc, req);
 		return err;
 	}
-	if (invalid_nodeid(outarg.nodeid)) {
-		fuse_put_request(fc, req);
-		return -EIO;
-	}
+	err = -EIO;
+	if (invalid_nodeid(outarg.nodeid))
+		goto out_put_request;
+
+	if ((outarg.attr.mode ^ mode) & S_IFMT)
+		goto out_put_request;
+
 	inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
 			  &outarg.attr);
 	if (!inode) {
@@ -280,22 +350,19 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
 	}
 	fuse_put_request(fc, req);
 
-	/* Don't allow userspace to do really stupid things... */
-	if (((inode->i_mode ^ mode) & S_IFMT) || dir_alias(inode)) {
+	if (dir_alias(inode)) {
 		iput(inode);
 		return -EIO;
 	}
 
-	entry->d_time = time_to_jiffies(outarg.entry_valid,
-					outarg.entry_valid_nsec);
-
-	fi = get_fuse_inode(inode);
-	fi->i_time = time_to_jiffies(outarg.attr_valid,
-				     outarg.attr_valid_nsec);
-
 	d_instantiate(entry, inode);
+	fuse_change_timeout(entry, &outarg);
 	fuse_invalidate_attr(dir);
 	return 0;
+
+ out_put_request:
+	fuse_put_request(fc, req);
+	return err;
 }
 
 static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode,
@@ -355,12 +422,7 @@ static int fuse_symlink(struct inode *dir, struct dentry *entry,
 {
 	struct fuse_conn *fc = get_fuse_conn(dir);
 	unsigned len = strlen(link) + 1;
-	struct fuse_req *req;
-
-	if (len > FUSE_SYMLINK_MAX)
-		return -ENAMETOOLONG;
-
-	req = fuse_get_request(fc);
+	struct fuse_req *req = fuse_get_request(fc);
 	if (!req)
 		return -EINTR;
 
@@ -399,6 +461,7 @@ static int fuse_unlink(struct inode *dir, struct dentry *entry)
 		inode->i_nlink = 0;
 		fuse_invalidate_attr(inode);
 		fuse_invalidate_attr(dir);
+		fuse_invalidate_entry_cache(entry);
 	} else if (err == -EINTR)
 		fuse_invalidate_entry(entry);
 	return err;
@@ -424,6 +487,7 @@ static int fuse_rmdir(struct inode *dir, struct dentry *entry)
 	if (!err) {
 		entry->d_inode->i_nlink = 0;
 		fuse_invalidate_attr(dir);
+		fuse_invalidate_entry_cache(entry);
 	} else if (err == -EINTR)
 		fuse_invalidate_entry(entry);
 	return err;
@@ -459,6 +523,10 @@ static int fuse_rename(struct inode *olddir, struct dentry *oldent,
 		fuse_invalidate_attr(olddir);
 		if (olddir != newdir)
 			fuse_invalidate_attr(newdir);
+
+		/* newent will end up negative */
+		if (newent->d_inode)
+			fuse_invalidate_entry_cache(newent);
 	} else if (err == -EINTR) {
 		/* If request was interrupted, DEITY only knows if the
 		   rename actually took place.  If the invalidation
@@ -566,6 +634,15 @@ static int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task)
 	return 0;
 }
 
+/*
+ * Check whether the inode attributes are still valid
+ *
+ * If the attribute validity timeout has expired, then fetch the fresh
+ * attributes with a 'getattr' request
+ *
+ * I'm not sure why cached attributes are never returned for the root
+ * inode, this is probably being too cautious.
+ */
 static int fuse_revalidate(struct dentry *entry)
 {
 	struct inode *inode = entry->d_inode;
@@ -613,6 +690,19 @@ static int fuse_access(struct inode *inode, int mask)
 	return err;
 }
 
+/*
+ * Check permission.  The two basic access models of FUSE are:
+ *
+ * 1) Local access checking ('default_permissions' mount option) based
+ * on file mode.  This is the plain old disk filesystem permission
+ * modell.
+ *
+ * 2) "Remote" access checking, where server is responsible for
+ * checking permission in each inode operation.  An exception to this
+ * is if ->permission() was invoked from sys_access() in which case an
+ * access request is sent.  Execute permission is still checked
+ * locally based on file mode.
+ */
 static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
 {
 	struct fuse_conn *fc = get_fuse_conn(inode);
@@ -631,14 +721,10 @@ static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
 				err = generic_permission(inode, mask, NULL);
 		}
 
-		/* FIXME: Need some mechanism to revoke permissions:
-		   currently if the filesystem suddenly changes the
-		   file mode, we will not be informed about it, and
-		   continue to allow access to the file/directory.
-
-		   This is actually not so grave, since the user can
-		   simply keep access to the file/directory anyway by
-		   keeping it open... */
+		/* Note: the opposite of the above test does not
+		   exist.  So if permissions are revoked this won't be
+		   noticed immediately, only after the attribute
+		   timeout has expired */
 
 		return err;
 	} else {
@@ -691,7 +777,12 @@ static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
 	struct page *page;
 	struct inode *inode = file->f_dentry->d_inode;
 	struct fuse_conn *fc = get_fuse_conn(inode);
-	struct fuse_req *req = fuse_get_request(fc);
+	struct fuse_req *req;
+
+	if (is_bad_inode(inode))
+		return -EIO;
+
+	req = fuse_get_request(fc);
 	if (!req)
 		return -EINTR;
 
@@ -806,6 +897,15 @@ static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
 	}
 }
 
+/*
+ * Set attributes, and at the same time refresh them.
+ *
+ * Truncation is slightly complicated, because the 'truncate' request
+ * may fail, in which case we don't want to touch the mapping.
+ * vmtruncate() doesn't allow for this case.  So do the rlimit
+ * checking by hand and call vmtruncate() only after the file has
+ * actually been truncated.
+ */
 static int fuse_setattr(struct dentry *entry, struct iattr *attr)
 {
 	struct inode *inode = entry->d_inode;
@@ -883,23 +983,6 @@ static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
 	return err;
 }
 
-static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
-				  struct nameidata *nd)
-{
-	struct inode *inode;
-	int err;
-
-	err = fuse_lookup_iget(dir, entry, &inode);
-	if (err)
-		return ERR_PTR(err);
-	if (inode && dir_alias(inode)) {
-		iput(inode);
-		return ERR_PTR(-EIO);
-	}
-	d_add(entry, inode);
-	return NULL;
-}
-
 static int fuse_setxattr(struct dentry *entry, const char *name,
 			 const void *value, size_t size, int flags)
 {
@@ -909,9 +992,6 @@ static int fuse_setxattr(struct dentry *entry, const char *name,
 	struct fuse_setxattr_in inarg;
 	int err;
 
-	if (size > FUSE_XATTR_SIZE_MAX)
-		return -E2BIG;
-
 	if (fc->no_setxattr)
 		return -EOPNOTSUPP;
 
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 2ca86141d13..63d2980df5c 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -163,6 +163,9 @@ static int fuse_flush(struct file *file)
 	struct fuse_flush_in inarg;
 	int err;
 
+	if (is_bad_inode(inode))
+		return -EIO;
+
 	if (fc->no_flush)
 		return 0;
 
@@ -199,6 +202,9 @@ int fuse_fsync_common(struct file *file, struct dentry *de, int datasync,
 	struct fuse_fsync_in inarg;
 	int err;
 
+	if (is_bad_inode(inode))
+		return -EIO;
+
 	if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir))
 		return 0;
 
@@ -272,16 +278,22 @@ static int fuse_readpage(struct file *file, struct page *page)
 {
 	struct inode *inode = page->mapping->host;
 	struct fuse_conn *fc = get_fuse_conn(inode);
-	loff_t pos = (loff_t) page->index << PAGE_CACHE_SHIFT;
-	struct fuse_req *req = fuse_get_request(fc);
-	int err = -EINTR;
+	struct fuse_req *req;
+	int err;
+
+	err = -EIO;
+	if (is_bad_inode(inode))
+		goto out;
+
+	err = -EINTR;
+	req = fuse_get_request(fc);
 	if (!req)
 		goto out;
 
 	req->out.page_zeroing = 1;
 	req->num_pages = 1;
 	req->pages[0] = page;
-	fuse_send_read(req, file, inode, pos, PAGE_CACHE_SIZE);
+	fuse_send_read(req, file, inode, page_offset(page), PAGE_CACHE_SIZE);
 	err = req->out.h.error;
 	fuse_put_request(fc, req);
 	if (!err)
@@ -295,7 +307,7 @@ static int fuse_readpage(struct file *file, struct page *page)
 static int fuse_send_readpages(struct fuse_req *req, struct file *file,
 			       struct inode *inode)
 {
-	loff_t pos = (loff_t) req->pages[0]->index << PAGE_CACHE_SHIFT;
+	loff_t pos = page_offset(req->pages[0]);
 	size_t count = req->num_pages << PAGE_CACHE_SHIFT;
 	unsigned i;
 	req->out.page_zeroing = 1;
@@ -345,6 +357,10 @@ static int fuse_readpages(struct file *file, struct address_space *mapping,
 	struct fuse_conn *fc = get_fuse_conn(inode);
 	struct fuse_readpages_data data;
 	int err;
+
+	if (is_bad_inode(inode))
+		return -EIO;
+
 	data.file = file;
 	data.inode = inode;
 	data.req = fuse_get_request(fc);
@@ -402,8 +418,13 @@ static int fuse_commit_write(struct file *file, struct page *page,
 	unsigned count = to - offset;
 	struct inode *inode = page->mapping->host;
 	struct fuse_conn *fc = get_fuse_conn(inode);
-	loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + offset;
-	struct fuse_req *req = fuse_get_request(fc);
+	loff_t pos = page_offset(page) + offset;
+	struct fuse_req *req;
+
+	if (is_bad_inode(inode))
+		return -EIO;
+
+	req = fuse_get_request(fc);
 	if (!req)
 		return -EINTR;
 
@@ -454,7 +475,7 @@ static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf,
 
 	nbytes = min(nbytes, (unsigned) FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT);
 	npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
-	npages = min(npages, FUSE_MAX_PAGES_PER_REQ);
+	npages = min(max(npages, 1), FUSE_MAX_PAGES_PER_REQ);
 	down_read(&current->mm->mmap_sem);
 	npages = get_user_pages(current, current->mm, user_addr, npages, write,
 				0, req->pages, NULL);
@@ -475,12 +496,16 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf,
 	size_t nmax = write ? fc->max_write : fc->max_read;
 	loff_t pos = *ppos;
 	ssize_t res = 0;
-	struct fuse_req *req = fuse_get_request(fc);
+	struct fuse_req *req;
+
+	if (is_bad_inode(inode))
+		return -EIO;
+
+	req = fuse_get_request(fc);
 	if (!req)
 		return -EINTR;
 
 	while (count) {
-		size_t tmp;
 		size_t nres;
 		size_t nbytes = min(count, nmax);
 		int err = fuse_get_user_pages(req, buf, nbytes, !write);
@@ -488,8 +513,8 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf,
 			res = err;
 			break;
 		}
-		tmp = (req->num_pages << PAGE_SHIFT) - req->page_offset;
-		nbytes = min(nbytes, tmp);
+		nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset;
+		nbytes = min(count, nbytes);
 		if (write)
 			nres = fuse_send_write(req, file, inode, pos, nbytes);
 		else
@@ -535,9 +560,9 @@ static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
 	struct inode *inode = file->f_dentry->d_inode;
 	ssize_t res;
 	/* Don't allow parallel writes to the same file */
-	down(&inode->i_sem);
+	mutex_lock(&inode->i_mutex);
 	res = fuse_direct_io(file, buf, count, ppos, 1);
-	up(&inode->i_sem);
+	mutex_unlock(&inode->i_mutex);
 	return res;
 }
 
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 0ea5301f86b..74c8d098a14 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -21,6 +21,9 @@
 /** If more requests are outstanding, then the operation will block */
 #define FUSE_MAX_OUTSTANDING 10
 
+/** It could be as large as PATH_MAX, but would that have any uses? */
+#define FUSE_NAME_MAX 1024
+
 /** If the FUSE_DEFAULT_PERMISSIONS flag is given, the filesystem
     module will check permissions based on the file mode.  Otherwise no
     permission checking is done in the kernel */
@@ -108,9 +111,6 @@ struct fuse_out {
 	struct fuse_arg args[3];
 };
 
-struct fuse_req;
-struct fuse_conn;
-
 /**
  * A request to the client
  */
@@ -159,7 +159,8 @@ struct fuse_req {
 	union {
 		struct fuse_forget_in forget_in;
 		struct fuse_release_in release_in;
-		struct fuse_init_in_out init_in_out;
+		struct fuse_init_in init_in;
+		struct fuse_init_out init_out;
 	} misc;
 
 	/** page vector */
@@ -272,6 +273,9 @@ struct fuse_conn {
 	/** Is create not implemented by fs? */
 	unsigned no_create : 1;
 
+	/** Negotiated minor version */
+	unsigned minor;
+
 	/** Backing dev info */
 	struct backing_dev_info bdi;
 };
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index e69a546844d..04c80cc957a 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -135,12 +135,8 @@ static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
 		fuse_init_common(inode);
 		init_special_inode(inode, inode->i_mode,
 				   new_decode_dev(attr->rdev));
-	} else {
-		/* Don't let user create weird files */
-		inode->i_mode = S_IFREG;
-		fuse_init_common(inode);
-		fuse_init_file_inode(inode);
-	}
+	} else
+		BUG();
 }
 
 static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
@@ -218,6 +214,7 @@ static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr
 {
 	stbuf->f_type    = FUSE_SUPER_MAGIC;
 	stbuf->f_bsize   = attr->bsize;
+	stbuf->f_frsize  = attr->frsize;
 	stbuf->f_blocks  = attr->blocks;
 	stbuf->f_bfree   = attr->bfree;
 	stbuf->f_bavail  = attr->bavail;
@@ -238,10 +235,12 @@ static int fuse_statfs(struct super_block *sb, struct kstatfs *buf)
 	if (!req)
 		return -EINTR;
 
+	memset(&outarg, 0, sizeof(outarg));
 	req->in.numargs = 0;
 	req->in.h.opcode = FUSE_STATFS;
 	req->out.numargs = 1;
-	req->out.args[0].size = sizeof(outarg);
+	req->out.args[0].size =
+		fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
 	req->out.args[0].value = &outarg;
 	request_send(fc, req);
 	err = req->out.h.error;
@@ -482,7 +481,6 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
 	fc->max_read = d.max_read;
 	if (fc->max_read / PAGE_CACHE_SIZE < fc->bdi.ra_pages)
 		fc->bdi.ra_pages = fc->max_read / PAGE_CACHE_SIZE;
-	fc->max_write = FUSE_MAX_IN / 2;
 
 	err = -ENOMEM;
 	root = get_root_inode(sb, d.rootmode);