X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fpipe.c;h=68090e84f589305ebe80ee57e723c86494ca6143;hb=5ccac88eeb5659c716af8e695e2943509c80d172;hp=e984beb93a0ea88c436037f6e17c0edfbad37d54;hpb=341b446bc5aa36d1d5b8159c1e66716b5d89024d;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/pipe.c b/fs/pipe.c
index e984beb..68090e8 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -55,7 +55,8 @@ void pipe_wait(struct pipe_inode_info *pipe)
 }
 
 static int
-pipe_iov_copy_from_user(void *to, struct iovec *iov, unsigned long len)
+pipe_iov_copy_from_user(void *to, struct iovec *iov, unsigned long len,
+			int atomic)
 {
 	unsigned long copy;
 
@@ -64,8 +65,13 @@ pipe_iov_copy_from_user(void *to, struct iovec *iov, unsigned long len)
 			iov++;
 		copy = min_t(unsigned long, len, iov->iov_len);
 
-		if (copy_from_user(to, iov->iov_base, copy))
-			return -EFAULT;
+		if (atomic) {
+			if (__copy_from_user_inatomic(to, iov->iov_base, copy))
+				return -EFAULT;
+		} else {
+			if (copy_from_user(to, iov->iov_base, copy))
+				return -EFAULT;
+		}
 		to += copy;
 		len -= copy;
 		iov->iov_base += copy;
@@ -75,7 +81,8 @@ pipe_iov_copy_from_user(void *to, struct iovec *iov, unsigned long len)
 }
 
 static int
-pipe_iov_copy_to_user(struct iovec *iov, const void *from, unsigned long len)
+pipe_iov_copy_to_user(struct iovec *iov, const void *from, unsigned long len,
+		      int atomic)
 {
 	unsigned long copy;
 
@@ -84,8 +91,13 @@ pipe_iov_copy_to_user(struct iovec *iov, const void *from, unsigned long len)
 			iov++;
 		copy = min_t(unsigned long, len, iov->iov_len);
 
-		if (copy_to_user(iov->iov_base, from, copy))
-			return -EFAULT;
+		if (atomic) {
+			if (__copy_to_user_inatomic(iov->iov_base, from, copy))
+				return -EFAULT;
+		} else {
+			if (copy_to_user(iov->iov_base, from, copy))
+				return -EFAULT;
+		}
 		from += copy;
 		len -= copy;
 		iov->iov_base += copy;
@@ -94,13 +106,52 @@ pipe_iov_copy_to_user(struct iovec *iov, const void *from, unsigned long len)
 	return 0;
 }
 
+/*
+ * Attempt to pre-fault in the user memory, so we can use atomic copies.
+ * Returns the number of bytes not faulted in.
+ */
+static int iov_fault_in_pages_write(struct iovec *iov, unsigned long len)
+{
+	while (!iov->iov_len)
+		iov++;
+
+	while (len > 0) {
+		unsigned long this_len;
+
+		this_len = min_t(unsigned long, len, iov->iov_len);
+		if (fault_in_pages_writeable(iov->iov_base, this_len))
+			break;
+
+		len -= this_len;
+		iov++;
+	}
+
+	return len;
+}
+
+/*
+ * Pre-fault in the user memory, so we can use atomic copies.
+ */
+static void iov_fault_in_pages_read(struct iovec *iov, unsigned long len)
+{
+	while (!iov->iov_len)
+		iov++;
+
+	while (len > 0) {
+		unsigned long this_len;
+
+		this_len = min_t(unsigned long, len, iov->iov_len);
+		fault_in_pages_readable(iov->iov_base, this_len);
+		len -= this_len;
+		iov++;
+	}
+}
+
 static void anon_pipe_buf_release(struct pipe_inode_info *pipe,
 				  struct pipe_buffer *buf)
 {
 	struct page *page = buf->page;
 
-	buf->flags &= ~PIPE_BUF_FLAG_STOLEN;
-
 	/*
 	 * If nobody else uses this page, and we don't already have a
 	 * temporary page, let's keep track of it as a one-deep
@@ -112,38 +163,66 @@ static void anon_pipe_buf_release(struct pipe_inode_info *pipe,
 		page_cache_release(page);
 }
 
-static void * anon_pipe_buf_map(struct file *file, struct pipe_inode_info *pipe,
-				struct pipe_buffer *buf)
+void *generic_pipe_buf_map(struct pipe_inode_info *pipe,
+			   struct pipe_buffer *buf, int atomic)
 {
+	if (atomic) {
+		buf->flags |= PIPE_BUF_FLAG_ATOMIC;
+		return kmap_atomic(buf->page, KM_USER0);
+	}
+
 	return kmap(buf->page);
 }
 
-static void anon_pipe_buf_unmap(struct pipe_inode_info *pipe,
-				struct pipe_buffer *buf)
+void generic_pipe_buf_unmap(struct pipe_inode_info *pipe,
+			    struct pipe_buffer *buf, void *map_data)
 {
-	kunmap(buf->page);
+	if (buf->flags & PIPE_BUF_FLAG_ATOMIC) {
+		buf->flags &= ~PIPE_BUF_FLAG_ATOMIC;
+		kunmap_atomic(map_data, KM_USER0);
+	} else
+		kunmap(buf->page);
 }
 
-static int anon_pipe_buf_steal(struct pipe_inode_info *pipe,
-			       struct pipe_buffer *buf)
+int generic_pipe_buf_steal(struct pipe_inode_info *pipe,
+			   struct pipe_buffer *buf)
+{
+	struct page *page = buf->page;
+
+	if (page_count(page) == 1) {
+		lock_page(page);
+		return 0;
+	}
+
+	return 1;
+}
+
+void generic_pipe_buf_get(struct pipe_inode_info *info, struct pipe_buffer *buf)
+{
+	page_cache_get(buf->page);
+}
+
+int generic_pipe_buf_pin(struct pipe_inode_info *info, struct pipe_buffer *buf)
 {
-	buf->flags |= PIPE_BUF_FLAG_STOLEN;
 	return 0;
 }
 
-static struct pipe_buf_operations anon_pipe_buf_ops = {
+static const struct pipe_buf_operations anon_pipe_buf_ops = {
 	.can_merge = 1,
-	.map = anon_pipe_buf_map,
-	.unmap = anon_pipe_buf_unmap,
+	.map = generic_pipe_buf_map,
+	.unmap = generic_pipe_buf_unmap,
+	.pin = generic_pipe_buf_pin,
 	.release = anon_pipe_buf_release,
-	.steal = anon_pipe_buf_steal,
+	.steal = generic_pipe_buf_steal,
+	.get = generic_pipe_buf_get,
 };
 
 static ssize_t
-pipe_readv(struct file *filp, const struct iovec *_iov,
-	   unsigned long nr_segs, loff_t *ppos)
+pipe_read(struct kiocb *iocb, const struct iovec *_iov,
+	   unsigned long nr_segs, loff_t pos)
 {
-	struct inode *inode = filp->f_dentry->d_inode;
+	struct file *filp = iocb->ki_filp;
+	struct inode *inode = filp->f_path.dentry->d_inode;
 	struct pipe_inode_info *pipe;
 	int do_wakeup;
 	ssize_t ret;
@@ -164,25 +243,36 @@ pipe_readv(struct file *filp, const struct iovec *_iov,
 		if (bufs) {
 			int curbuf = pipe->curbuf;
 			struct pipe_buffer *buf = pipe->bufs + curbuf;
-			struct pipe_buf_operations *ops = buf->ops;
+			const struct pipe_buf_operations *ops = buf->ops;
 			void *addr;
 			size_t chars = buf->len;
-			int error;
+			int error, atomic;
 
 			if (chars > total_len)
 				chars = total_len;
 
-			addr = ops->map(filp, pipe, buf);
-			if (IS_ERR(addr)) {
+			error = ops->pin(pipe, buf);
+			if (error) {
 				if (!ret)
-					ret = PTR_ERR(addr);
+					error = ret;
 				break;
 			}
-			error = pipe_iov_copy_to_user(iov, addr + buf->offset, chars);
-			ops->unmap(pipe, buf);
+
+			atomic = !iov_fault_in_pages_write(iov, chars);
+redo:
+			addr = ops->map(pipe, buf, atomic);
+			error = pipe_iov_copy_to_user(iov, addr + buf->offset, chars, atomic);
+			ops->unmap(pipe, buf, addr);
 			if (unlikely(error)) {
+				/*
+				 * Just retry with the slow path if we failed.
+				 */
+				if (atomic) {
+					atomic = 0;
+					goto redo;
+				}
 				if (!ret)
-					ret = -EFAULT;
+					ret = error;
 				break;
 			}
 			ret += chars;
@@ -241,18 +331,11 @@ pipe_readv(struct file *filp, const struct iovec *_iov,
 }
 
 static ssize_t
-pipe_read(struct file *filp, char __user *buf, size_t count, loff_t *ppos)
+pipe_write(struct kiocb *iocb, const struct iovec *_iov,
+	    unsigned long nr_segs, loff_t ppos)
 {
-	struct iovec iov = { .iov_base = buf, .iov_len = count };
-
-	return pipe_readv(filp, &iov, 1, ppos);
-}
-
-static ssize_t
-pipe_writev(struct file *filp, const struct iovec *_iov,
-	    unsigned long nr_segs, loff_t *ppos)
-{
-	struct inode *inode = filp->f_dentry->d_inode;
+	struct file *filp = iocb->ki_filp;
+	struct inode *inode = filp->f_path.dentry->d_inode;
 	struct pipe_inode_info *pipe;
 	ssize_t ret;
 	int do_wakeup;
@@ -282,25 +365,32 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
 		int lastbuf = (pipe->curbuf + pipe->nrbufs - 1) &
 							(PIPE_BUFFERS-1);
 		struct pipe_buffer *buf = pipe->bufs + lastbuf;
-		struct pipe_buf_operations *ops = buf->ops;
+		const struct pipe_buf_operations *ops = buf->ops;
 		int offset = buf->offset + buf->len;
 
 		if (ops->can_merge && offset + chars <= PAGE_SIZE) {
+			int error, atomic = 1;
 			void *addr;
-			int error;
 
-			addr = ops->map(filp, pipe, buf);
-			if (IS_ERR(addr)) {
-				error = PTR_ERR(addr);
+			error = ops->pin(pipe, buf);
+			if (error)
 				goto out;
-			}
+
+			iov_fault_in_pages_read(iov, chars);
+redo1:
+			addr = ops->map(pipe, buf, atomic);
 			error = pipe_iov_copy_from_user(offset + addr, iov,
-							chars);
-			ops->unmap(pipe, buf);
+							chars, atomic);
+			ops->unmap(pipe, buf, addr);
 			ret = error;
 			do_wakeup = 1;
-			if (error)
+			if (error) {
+				if (atomic) {
+					atomic = 0;
+					goto redo1;
+				}
 				goto out;
+			}
 			buf->len += chars;
 			total_len -= chars;
 			ret = chars;
@@ -323,7 +413,8 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
 			int newbuf = (pipe->curbuf + bufs) & (PIPE_BUFFERS-1);
 			struct pipe_buffer *buf = pipe->bufs + newbuf;
 			struct page *page = pipe->tmp_page;
-			int error;
+			char *src;
+			int error, atomic = 1;
 
 			if (!page) {
 				page = alloc_page(GFP_HIGHUSER);
@@ -343,11 +434,27 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
 			if (chars > total_len)
 				chars = total_len;
 
-			error = pipe_iov_copy_from_user(kmap(page), iov, chars);
-			kunmap(page);
+			iov_fault_in_pages_read(iov, chars);
+redo2:
+			if (atomic)
+				src = kmap_atomic(page, KM_USER0);
+			else
+				src = kmap(page);
+
+			error = pipe_iov_copy_from_user(src, iov, chars,
+							atomic);
+			if (atomic)
+				kunmap_atomic(src, KM_USER0);
+			else
+				kunmap(page);
+
 			if (unlikely(error)) {
+				if (atomic) {
+					atomic = 0;
+					goto redo2;
+				}
 				if (!ret)
-					ret = -EFAULT;
+					ret = error;
 				break;
 			}
 			ret += chars;
@@ -397,15 +504,6 @@ out:
 }
 
 static ssize_t
-pipe_write(struct file *filp, const char __user *buf,
-	   size_t count, loff_t *ppos)
-{
-	struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = count };
-
-	return pipe_writev(filp, &iov, 1, ppos);
-}
-
-static ssize_t
 bad_pipe_r(struct file *filp, char __user *buf, size_t count, loff_t *ppos)
 {
 	return -EBADF;
@@ -422,7 +520,7 @@ static int
 pipe_ioctl(struct inode *pino, struct file *filp,
 	   unsigned int cmd, unsigned long arg)
 {
-	struct inode *inode = filp->f_dentry->d_inode;
+	struct inode *inode = filp->f_path.dentry->d_inode;
 	struct pipe_inode_info *pipe;
 	int count, buf, nrbufs;
 
@@ -450,7 +548,7 @@ static unsigned int
 pipe_poll(struct file *filp, poll_table *wait)
 {
 	unsigned int mask;
-	struct inode *inode = filp->f_dentry->d_inode;
+	struct inode *inode = filp->f_path.dentry->d_inode;
 	struct pipe_inode_info *pipe = inode->i_pipe;
 	int nrbufs;
 
@@ -503,7 +601,7 @@ pipe_release(struct inode *inode, int decr, int decw)
 static int
 pipe_read_fasync(int fd, struct file *filp, int on)
 {
-	struct inode *inode = filp->f_dentry->d_inode;
+	struct inode *inode = filp->f_path.dentry->d_inode;
 	int retval;
 
 	mutex_lock(&inode->i_mutex);
@@ -520,7 +618,7 @@ pipe_read_fasync(int fd, struct file *filp, int on)
 static int
 pipe_write_fasync(int fd, struct file *filp, int on)
 {
-	struct inode *inode = filp->f_dentry->d_inode;
+	struct inode *inode = filp->f_path.dentry->d_inode;
 	int retval;
 
 	mutex_lock(&inode->i_mutex);
@@ -537,7 +635,7 @@ pipe_write_fasync(int fd, struct file *filp, int on)
 static int
 pipe_rdwr_fasync(int fd, struct file *filp, int on)
 {
-	struct inode *inode = filp->f_dentry->d_inode;
+	struct inode *inode = filp->f_path.dentry->d_inode;
 	struct pipe_inode_info *pipe = inode->i_pipe;
 	int retval;
 
@@ -623,8 +721,8 @@ pipe_rdwr_open(struct inode *inode, struct file *filp)
  */
 const struct file_operations read_fifo_fops = {
 	.llseek		= no_llseek,
-	.read		= pipe_read,
-	.readv		= pipe_readv,
+	.read		= do_sync_read,
+	.aio_read	= pipe_read,
 	.write		= bad_pipe_w,
 	.poll		= pipe_poll,
 	.ioctl		= pipe_ioctl,
@@ -636,8 +734,8 @@ const struct file_operations read_fifo_fops = {
 const struct file_operations write_fifo_fops = {
 	.llseek		= no_llseek,
 	.read		= bad_pipe_r,
-	.write		= pipe_write,
-	.writev		= pipe_writev,
+	.write		= do_sync_write,
+	.aio_write	= pipe_write,
 	.poll		= pipe_poll,
 	.ioctl		= pipe_ioctl,
 	.open		= pipe_write_open,
@@ -647,10 +745,10 @@ const struct file_operations write_fifo_fops = {
 
 const struct file_operations rdwr_fifo_fops = {
 	.llseek		= no_llseek,
-	.read		= pipe_read,
-	.readv		= pipe_readv,
-	.write		= pipe_write,
-	.writev		= pipe_writev,
+	.read		= do_sync_read,
+	.aio_read	= pipe_read,
+	.write		= do_sync_write,
+	.aio_write	= pipe_write,
 	.poll		= pipe_poll,
 	.ioctl		= pipe_ioctl,
 	.open		= pipe_rdwr_open,
@@ -658,10 +756,10 @@ const struct file_operations rdwr_fifo_fops = {
 	.fasync		= pipe_rdwr_fasync,
 };
 
-static struct file_operations read_pipe_fops = {
+static const struct file_operations read_pipe_fops = {
 	.llseek		= no_llseek,
-	.read		= pipe_read,
-	.readv		= pipe_readv,
+	.read		= do_sync_read,
+	.aio_read	= pipe_read,
 	.write		= bad_pipe_w,
 	.poll		= pipe_poll,
 	.ioctl		= pipe_ioctl,
@@ -670,11 +768,11 @@ static struct file_operations read_pipe_fops = {
 	.fasync		= pipe_read_fasync,
 };
 
-static struct file_operations write_pipe_fops = {
+static const struct file_operations write_pipe_fops = {
 	.llseek		= no_llseek,
 	.read		= bad_pipe_r,
-	.write		= pipe_write,
-	.writev		= pipe_writev,
+	.write		= do_sync_write,
+	.aio_write	= pipe_write,
 	.poll		= pipe_poll,
 	.ioctl		= pipe_ioctl,
 	.open		= pipe_write_open,
@@ -682,12 +780,12 @@ static struct file_operations write_pipe_fops = {
 	.fasync		= pipe_write_fasync,
 };
 
-static struct file_operations rdwr_pipe_fops = {
+static const struct file_operations rdwr_pipe_fops = {
 	.llseek		= no_llseek,
-	.read		= pipe_read,
-	.readv		= pipe_readv,
-	.write		= pipe_write,
-	.writev		= pipe_writev,
+	.read		= do_sync_read,
+	.aio_read	= pipe_read,
+	.write		= do_sync_write,
+	.aio_write	= pipe_write,
 	.poll		= pipe_poll,
 	.ioctl		= pipe_ioctl,
 	.open		= pipe_rdwr_open,
@@ -732,7 +830,14 @@ void free_pipe_info(struct inode *inode)
 static struct vfsmount *pipe_mnt __read_mostly;
 static int pipefs_delete_dentry(struct dentry *dentry)
 {
-	return 1;
+	/*
+	 * At creation time, we pretended this dentry was hashed
+	 * (by clearing DCACHE_UNHASHED bit in d_flags)
+	 * At delete time, we restore the truth : not hashed.
+	 * (so that dput() can proceed correctly)
+	 */
+	dentry->d_flags |= DCACHE_UNHASHED;
+	return 0;
 }
 
 static struct dentry_operations pipefs_dentry_operations = {
@@ -766,7 +871,6 @@ static struct inode * get_pipe_inode(void)
 	inode->i_uid = current->fsuid;
 	inode->i_gid = current->fsgid;
 	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
-	inode->i_blksize = PAGE_SIZE;
 
 	return inode;
 
@@ -777,87 +881,126 @@ fail_inode:
 	return NULL;
 }
 
-int do_pipe(int *fd)
+struct file *create_write_pipe(void)
 {
-	struct qstr this;
-	char name[32];
+	int err;
+	struct inode *inode;
+	struct file *f;
 	struct dentry *dentry;
-	struct inode * inode;
-	struct file *f1, *f2;
-	int error;
-	int i, j;
-
-	error = -ENFILE;
-	f1 = get_empty_filp();
-	if (!f1)
-		goto no_files;
-
-	f2 = get_empty_filp();
-	if (!f2)
-		goto close_f1;
+	char name[32];
+	struct qstr this;
 
+	f = get_empty_filp();
+	if (!f)
+		return ERR_PTR(-ENFILE);
+	err = -ENFILE;
 	inode = get_pipe_inode();
 	if (!inode)
-		goto close_f12;
+		goto err_file;
 
-	error = get_unused_fd();
-	if (error < 0)
-		goto close_f12_inode;
-	i = error;
-
-	error = get_unused_fd();
-	if (error < 0)
-		goto close_f12_inode_i;
-	j = error;
-
-	error = -ENOMEM;
-	sprintf(name, "[%lu]", inode->i_ino);
+	this.len = sprintf(name, "[%lu]", inode->i_ino);
 	this.name = name;
-	this.len = strlen(name);
-	this.hash = inode->i_ino; /* will go */
+	this.hash = 0;
+	err = -ENOMEM;
 	dentry = d_alloc(pipe_mnt->mnt_sb->s_root, &this);
 	if (!dentry)
-		goto close_f12_inode_i_j;
+		goto err_inode;
 
 	dentry->d_op = &pipefs_dentry_operations;
-	d_add(dentry, inode);
-	f1->f_vfsmnt = f2->f_vfsmnt = mntget(mntget(pipe_mnt));
-	f1->f_dentry = f2->f_dentry = dget(dentry);
-	f1->f_mapping = f2->f_mapping = inode->i_mapping;
-
-	/* read file */
-	f1->f_pos = f2->f_pos = 0;
-	f1->f_flags = O_RDONLY;
-	f1->f_op = &read_pipe_fops;
-	f1->f_mode = FMODE_READ;
-	f1->f_version = 0;
-
-	/* write file */
-	f2->f_flags = O_WRONLY;
-	f2->f_op = &write_pipe_fops;
-	f2->f_mode = FMODE_WRITE;
-	f2->f_version = 0;
-
-	fd_install(i, f1);
-	fd_install(j, f2);
-	fd[0] = i;
-	fd[1] = j;
+	/*
+	 * We dont want to publish this dentry into global dentry hash table.
+	 * We pretend dentry is already hashed, by unsetting DCACHE_UNHASHED
+	 * This permits a working /proc/$pid/fd/XXX on pipes
+	 */
+	dentry->d_flags &= ~DCACHE_UNHASHED;
+	d_instantiate(dentry, inode);
+	f->f_path.mnt = mntget(pipe_mnt);
+	f->f_path.dentry = dentry;
+	f->f_mapping = inode->i_mapping;
 
-	return 0;
+	f->f_flags = O_WRONLY;
+	f->f_op = &write_pipe_fops;
+	f->f_mode = FMODE_WRITE;
+	f->f_version = 0;
 
-close_f12_inode_i_j:
-	put_unused_fd(j);
-close_f12_inode_i:
-	put_unused_fd(i);
-close_f12_inode:
+	return f;
+
+ err_inode:
 	free_pipe_info(inode);
 	iput(inode);
-close_f12:
-	put_filp(f2);
-close_f1:
-	put_filp(f1);
-no_files:
-	return error;	
+ err_file:
+	put_filp(f);
+	return ERR_PTR(err);
+}
+
+void free_write_pipe(struct file *f)
+{
+	free_pipe_info(f->f_dentry->d_inode);
+	dput(f->f_path.dentry);
+	mntput(f->f_path.mnt);
+	put_filp(f);
+}
+
+struct file *create_read_pipe(struct file *wrf)
+{
+	struct file *f = get_empty_filp();
+	if (!f)
+		return ERR_PTR(-ENFILE);
+
+	/* Grab pipe from the writer */
+	f->f_path.mnt = mntget(wrf->f_path.mnt);
+	f->f_path.dentry = dget(wrf->f_path.dentry);
+	f->f_mapping = wrf->f_path.dentry->d_inode->i_mapping;
+
+	f->f_pos = 0;
+	f->f_flags = O_RDONLY;
+	f->f_op = &read_pipe_fops;
+	f->f_mode = FMODE_READ;
+	f->f_version = 0;
+
+	return f;
+}
+
+int do_pipe(int *fd)
+{
+	struct file *fw, *fr;
+	int error;
+	int fdw, fdr;
+
+	fw = create_write_pipe();
+	if (IS_ERR(fw))
+		return PTR_ERR(fw);
+	fr = create_read_pipe(fw);
+	error = PTR_ERR(fr);
+	if (IS_ERR(fr))
+		goto err_write_pipe;
+
+	error = get_unused_fd();
+	if (error < 0)
+		goto err_read_pipe;
+	fdr = error;
+
+	error = get_unused_fd();
+	if (error < 0)
+		goto err_fdr;
+	fdw = error;
+
+	fd_install(fdr, fr);
+	fd_install(fdw, fw);
+	fd[0] = fdr;
+	fd[1] = fdw;
+
+	return 0;
+
+ err_fdr:
+	put_unused_fd(fdr);
+ err_read_pipe:
+	dput(fr->f_dentry);
+	mntput(fr->f_vfsmnt);
+	put_filp(fr);
+ err_write_pipe:
+	free_write_pipe(fw);
+	return error;
 }
 
 /*
@@ -866,12 +1009,11 @@ no_files:
  * any operations on the root directory. However, we need a non-trivial
  * d_name - pipe: will go nicely and kill the special-casing in procfs.
  */
-
-static struct super_block *
-pipefs_get_sb(struct file_system_type *fs_type, int flags,
-	      const char *dev_name, void *data)
+static int pipefs_get_sb(struct file_system_type *fs_type,
+			 int flags, const char *dev_name, void *data,
+			 struct vfsmount *mnt)
 {
-	return get_sb_pseudo(fs_type, "pipe:", NULL, PIPEFS_MAGIC);
+	return get_sb_pseudo(fs_type, "pipe:", NULL, PIPEFS_MAGIC, mnt);
 }
 
 static struct file_system_type pipe_fs_type = {