Merge Linus master into drm-next

The merge is clean, but the arm build fails afterwards,
due to API changes in the regulator tree.

I've included the patch into the merge to fix the build.

Signed-off-by: Dave Airlie <airlied@redhat.com>

4 files changed, 105 insertions, 138 deletions

diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c
index 28d0c7abba1c..e5bbf748b698 100644
--- a/fs/fuse/cuse.c
+++ b/fs/fuse/cuse.c
@@ -38,7 +38,6 @@
 #include <linux/device.h>
 #include <linux/file.h>
 #include <linux/fs.h>
-#include <linux/aio.h>
 #include <linux/kdev_t.h>
 #include <linux/kthread.h>
 #include <linux/list.h>
@@ -48,6 +47,7 @@
 #include <linux/slab.h>
 #include <linux/stat.h>
 #include <linux/module.h>
+#include <linux/uio.h>
 
 #include "fuse_i.h"
 
@@ -88,32 +88,23 @@ static struct list_head *cuse_conntbl_head(dev_t devt)
  * FUSE file.
  */
 
-static ssize_t cuse_read(struct file *file, char __user *buf, size_t count,
-			 loff_t *ppos)
+static ssize_t cuse_read_iter(struct kiocb *kiocb, struct iov_iter *to)
 {
+	struct fuse_io_priv io = { .async = 0, .file = kiocb->ki_filp };
 	loff_t pos = 0;
-	struct iovec iov = { .iov_base = buf, .iov_len = count };
-	struct fuse_io_priv io = { .async = 0, .file = file };
-	struct iov_iter ii;
-	iov_iter_init(&ii, READ, &iov, 1, count);
 
-	return fuse_direct_io(&io, &ii, &pos, FUSE_DIO_CUSE);
+	return fuse_direct_io(&io, to, &pos, FUSE_DIO_CUSE);
 }
 
-static ssize_t cuse_write(struct file *file, const char __user *buf,
-			  size_t count, loff_t *ppos)
+static ssize_t cuse_write_iter(struct kiocb *kiocb, struct iov_iter *from)
 {
+	struct fuse_io_priv io = { .async = 0, .file = kiocb->ki_filp };
 	loff_t pos = 0;
-	struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = count };
-	struct fuse_io_priv io = { .async = 0, .file = file };
-	struct iov_iter ii;
-	iov_iter_init(&ii, WRITE, &iov, 1, count);
-
 	/*
 	 * No locking or generic_write_checks(), the server is
 	 * responsible for locking and sanity checks.
 	 */
-	return fuse_direct_io(&io, &ii, &pos,
+	return fuse_direct_io(&io, from, &pos,
 			      FUSE_DIO_WRITE | FUSE_DIO_CUSE);
 }
 
@@ -186,8 +177,8 @@ static long cuse_file_compat_ioctl(struct file *file, unsigned int cmd,
 
 static const struct file_operations cuse_frontend_fops = {
 	.owner			= THIS_MODULE,
-	.read			= cuse_read,
-	.write			= cuse_write,
+	.read_iter		= cuse_read_iter,
+	.write_iter		= cuse_write_iter,
 	.open			= cuse_open,
 	.release		= cuse_release,
 	.unlocked_ioctl		= cuse_file_ioctl,
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 39706c57ad3c..c8b68ab2e574 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -19,7 +19,6 @@
 #include <linux/pipe_fs_i.h>
 #include <linux/swap.h>
 #include <linux/splice.h>
-#include <linux/aio.h>
 
 MODULE_ALIAS_MISCDEV(FUSE_MINOR);
 MODULE_ALIAS("devname:fuse");
@@ -711,28 +710,26 @@ struct fuse_copy_state {
 	struct fuse_conn *fc;
 	int write;
 	struct fuse_req *req;
-	const struct iovec *iov;
+	struct iov_iter *iter;
 	struct pipe_buffer *pipebufs;
 	struct pipe_buffer *currbuf;
 	struct pipe_inode_info *pipe;
 	unsigned long nr_segs;
-	unsigned long seglen;
-	unsigned long addr;
 	struct page *pg;
 	unsigned len;
 	unsigned offset;
 	unsigned move_pages:1;
 };
 
-static void fuse_copy_init(struct fuse_copy_state *cs, struct fuse_conn *fc,
+static void fuse_copy_init(struct fuse_copy_state *cs,
+			   struct fuse_conn *fc,
 			   int write,
-			   const struct iovec *iov, unsigned long nr_segs)
+			   struct iov_iter *iter)
 {
 	memset(cs, 0, sizeof(*cs));
 	cs->fc = fc;
 	cs->write = write;
-	cs->iov = iov;
-	cs->nr_segs = nr_segs;
+	cs->iter = iter;
 }
 
 /* Unmap and put previous page of userspace buffer */
@@ -800,22 +797,16 @@ static int fuse_copy_fill(struct fuse_copy_state *cs)
 			cs->nr_segs++;
 		}
 	} else {
-		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--;
-		}
-		err = get_user_pages_fast(cs->addr, 1, cs->write, &page);
+		size_t off;
+		err = iov_iter_get_pages(cs->iter, &page, PAGE_SIZE, 1, &off);
 		if (err < 0)
 			return err;
-		BUG_ON(err != 1);
+		BUG_ON(!err);
+		cs->len = err;
+		cs->offset = off;
 		cs->pg = page;
-		cs->offset = cs->addr % PAGE_SIZE;
-		cs->len = min(PAGE_SIZE - cs->offset, cs->seglen);
-		cs->seglen -= cs->len;
-		cs->addr += cs->len;
+		cs->offset = off;
+		iov_iter_advance(cs->iter, err);
 	}
 
 	return lock_request(cs->fc, cs->req);
@@ -1364,8 +1355,7 @@ static int fuse_dev_open(struct inode *inode, struct file *file)
 	return 0;
 }
 
-static ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov,
-			      unsigned long nr_segs, loff_t pos)
+static ssize_t fuse_dev_read(struct kiocb *iocb, struct iov_iter *to)
 {
 	struct fuse_copy_state cs;
 	struct file *file = iocb->ki_filp;
@@ -1373,9 +1363,12 @@ static ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov,
 	if (!fc)
 		return -EPERM;
 
-	fuse_copy_init(&cs, fc, 1, iov, nr_segs);
+	if (!iter_is_iovec(to))
+		return -EINVAL;
 
-	return fuse_dev_do_read(fc, file, &cs, iov_length(iov, nr_segs));
+	fuse_copy_init(&cs, fc, 1, to);
+
+	return fuse_dev_do_read(fc, file, &cs, iov_iter_count(to));
 }
 
 static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos,
@@ -1395,7 +1388,7 @@ static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos,
 	if (!bufs)
 		return -ENOMEM;
 
-	fuse_copy_init(&cs, fc, 1, NULL, 0);
+	fuse_copy_init(&cs, fc, 1, NULL);
 	cs.pipebufs = bufs;
 	cs.pipe = pipe;
 	ret = fuse_dev_do_read(fc, in, &cs, len);
@@ -1971,17 +1964,19 @@ static ssize_t fuse_dev_do_write(struct fuse_conn *fc,
 	return err;
 }
 
-static ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov,
-			      unsigned long nr_segs, loff_t pos)
+static ssize_t fuse_dev_write(struct kiocb *iocb, struct iov_iter *from)
 {
 	struct fuse_copy_state cs;
 	struct fuse_conn *fc = fuse_get_conn(iocb->ki_filp);
 	if (!fc)
 		return -EPERM;
 
-	fuse_copy_init(&cs, fc, 0, iov, nr_segs);
+	if (!iter_is_iovec(from))
+		return -EINVAL;
+
+	fuse_copy_init(&cs, fc, 0, from);
 
-	return fuse_dev_do_write(fc, &cs, iov_length(iov, nr_segs));
+	return fuse_dev_do_write(fc, &cs, iov_iter_count(from));
 }
 
 static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe,
@@ -2044,8 +2039,9 @@ static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe,
 	}
 	pipe_unlock(pipe);
 
-	fuse_copy_init(&cs, fc, 0, NULL, nbuf);
+	fuse_copy_init(&cs, fc, 0, NULL);
 	cs.pipebufs = bufs;
+	cs.nr_segs = nbuf;
 	cs.pipe = pipe;
 
 	if (flags & SPLICE_F_MOVE)
@@ -2233,11 +2229,9 @@ const struct file_operations fuse_dev_operations = {
 	.owner		= THIS_MODULE,
 	.open		= fuse_dev_open,
 	.llseek		= no_llseek,
-	.read		= do_sync_read,
-	.aio_read	= fuse_dev_read,
+	.read_iter	= fuse_dev_read,
 	.splice_read	= fuse_dev_splice_read,
-	.write		= do_sync_write,
-	.aio_write	= fuse_dev_write,
+	.write_iter	= fuse_dev_write,
 	.splice_write	= fuse_dev_splice_write,
 	.poll		= fuse_dev_poll,
 	.release	= fuse_dev_release,
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index c01ec3bdcfd8..5ef05b5c4cff 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -15,8 +15,8 @@
 #include <linux/module.h>
 #include <linux/compat.h>
 #include <linux/swap.h>
-#include <linux/aio.h>
 #include <linux/falloc.h>
+#include <linux/uio.h>
 
 static const struct file_operations fuse_direct_io_file_operations;
 
@@ -528,6 +528,17 @@ static void fuse_release_user_pages(struct fuse_req *req, int write)
 	}
 }
 
+static ssize_t fuse_get_res_by_io(struct fuse_io_priv *io)
+{
+	if (io->err)
+		return io->err;
+
+	if (io->bytes >= 0 && io->write)
+		return -EIO;
+
+	return io->bytes < 0 ? io->size : io->bytes;
+}
+
 /**
  * In case of short read, the caller sets 'pos' to the position of
  * actual end of fuse request in IO request. Otherwise, if bytes_requested
@@ -546,6 +557,7 @@ static void fuse_release_user_pages(struct fuse_req *req, int write)
  */
 static void fuse_aio_complete(struct fuse_io_priv *io, int err, ssize_t pos)
 {
+	bool is_sync = is_sync_kiocb(io->iocb);
 	int left;
 
 	spin_lock(&io->lock);
@@ -555,30 +567,24 @@ static void fuse_aio_complete(struct fuse_io_priv *io, int err, ssize_t pos)
 		io->bytes = pos;
 
 	left = --io->reqs;
+	if (!left && is_sync)
+		complete(io->done);
 	spin_unlock(&io->lock);
 
-	if (!left) {
-		long res;
+	if (!left && !is_sync) {
+		ssize_t res = fuse_get_res_by_io(io);
 
-		if (io->err)
-			res = io->err;
-		else if (io->bytes >= 0 && io->write)
-			res = -EIO;
-		else {
-			res = io->bytes < 0 ? io->size : io->bytes;
-
-			if (!is_sync_kiocb(io->iocb)) {
-				struct inode *inode = file_inode(io->iocb->ki_filp);
-				struct fuse_conn *fc = get_fuse_conn(inode);
-				struct fuse_inode *fi = get_fuse_inode(inode);
+		if (res >= 0) {
+			struct inode *inode = file_inode(io->iocb->ki_filp);
+			struct fuse_conn *fc = get_fuse_conn(inode);
+			struct fuse_inode *fi = get_fuse_inode(inode);
 
-				spin_lock(&fc->lock);
-				fi->attr_version = ++fc->attr_version;
-				spin_unlock(&fc->lock);
-			}
+			spin_lock(&fc->lock);
+			fi->attr_version = ++fc->attr_version;
+			spin_unlock(&fc->lock);
 		}
 
-		aio_complete(io->iocb, res, 0);
+		io->iocb->ki_complete(io->iocb, res, 0);
 		kfree(io);
 	}
 }
@@ -1139,13 +1145,11 @@ static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 {
 	struct file *file = iocb->ki_filp;
 	struct address_space *mapping = file->f_mapping;
-	size_t count = iov_iter_count(from);
 	ssize_t written = 0;
 	ssize_t written_buffered = 0;
 	struct inode *inode = mapping->host;
 	ssize_t err;
 	loff_t endbyte = 0;
-	loff_t pos = iocb->ki_pos;
 
 	if (get_fuse_conn(inode)->writeback_cache) {
 		/* Update size (EOF optimization) and mode (SUID clearing) */
@@ -1161,14 +1165,10 @@ static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 	/* We can write back this queue in page reclaim */
 	current->backing_dev_info = inode_to_bdi(inode);
 
-	err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
-	if (err)
+	err = generic_write_checks(iocb, from);
+	if (err <= 0)
 		goto out;
 
-	if (count == 0)
-		goto out;
-
-	iov_iter_truncate(from, count);
 	err = file_remove_suid(file);
 	if (err)
 		goto out;
@@ -1177,7 +1177,8 @@ static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 	if (err)
 		goto out;
 
-	if (file->f_flags & O_DIRECT) {
+	if (iocb->ki_flags & IOCB_DIRECT) {
+		loff_t pos = iocb->ki_pos;
 		written = generic_file_direct_write(iocb, from, pos);
 		if (written < 0 || !iov_iter_count(from))
 			goto out;
@@ -1203,9 +1204,9 @@ static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 		written += written_buffered;
 		iocb->ki_pos = pos + written_buffered;
 	} else {
-		written = fuse_perform_write(file, mapping, from, pos);
+		written = fuse_perform_write(file, mapping, from, iocb->ki_pos);
 		if (written >= 0)
-			iocb->ki_pos = pos + written;
+			iocb->ki_pos += written;
 	}
 out:
 	current->backing_dev_info = NULL;
@@ -1395,55 +1396,30 @@ static ssize_t __fuse_direct_read(struct fuse_io_priv *io,
 	return res;
 }
 
-static ssize_t fuse_direct_read(struct file *file, char __user *buf,
-				     size_t count, loff_t *ppos)
-{
-	struct fuse_io_priv io = { .async = 0, .file = file };
-	struct iovec iov = { .iov_base = buf, .iov_len = count };
-	struct iov_iter ii;
-	iov_iter_init(&ii, READ, &iov, 1, count);
-	return __fuse_direct_read(&io, &ii, ppos);
-}
-
-static ssize_t __fuse_direct_write(struct fuse_io_priv *io,
-				   struct iov_iter *iter,
-				   loff_t *ppos)
+static ssize_t fuse_direct_read_iter(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct file *file = io->file;
-	struct inode *inode = file_inode(file);
-	size_t count = iov_iter_count(iter);
-	ssize_t res;
-
-
-	res = generic_write_checks(file, ppos, &count, 0);
-	if (!res) {
-		iov_iter_truncate(iter, count);
-		res = fuse_direct_io(io, iter, ppos, FUSE_DIO_WRITE);
-	}
-
-	fuse_invalidate_attr(inode);
-
-	return res;
+	struct fuse_io_priv io = { .async = 0, .file = iocb->ki_filp };
+	return __fuse_direct_read(&io, to, &iocb->ki_pos);
 }
 
-static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
-				 size_t count, loff_t *ppos)
+static ssize_t fuse_direct_write_iter(struct kiocb *iocb, struct iov_iter *from)
 {
-	struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = count };
+	struct file *file = iocb->ki_filp;
 	struct inode *inode = file_inode(file);
-	ssize_t res;
 	struct fuse_io_priv io = { .async = 0, .file = file };
-	struct iov_iter ii;
-	iov_iter_init(&ii, WRITE, &iov, 1, count);
+	ssize_t res;
 
 	if (is_bad_inode(inode))
 		return -EIO;
 
 	/* Don't allow parallel writes to the same file */
 	mutex_lock(&inode->i_mutex);
-	res = __fuse_direct_write(&io, &ii, ppos);
+	res = generic_write_checks(iocb, from);
 	if (res > 0)
-		fuse_write_update_size(inode, *ppos);
+		res = fuse_direct_io(&io, from, &iocb->ki_pos, FUSE_DIO_WRITE);
+	fuse_invalidate_attr(inode);
+	if (res > 0)
+		fuse_write_update_size(inode, iocb->ki_pos);
 	mutex_unlock(&inode->i_mutex);
 
 	return res;
@@ -2798,9 +2774,9 @@ static inline loff_t fuse_round_up(loff_t off)
 }
 
 static ssize_t
-fuse_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
-			loff_t offset)
+fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter, loff_t offset)
 {
+	DECLARE_COMPLETION_ONSTACK(wait);
 	ssize_t ret = 0;
 	struct file *file = iocb->ki_filp;
 	struct fuse_file *ff = file->private_data;
@@ -2815,15 +2791,15 @@ fuse_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
 	inode = file->f_mapping->host;
 	i_size = i_size_read(inode);
 
-	if ((rw == READ) && (offset > i_size))
+	if ((iov_iter_rw(iter) == READ) && (offset > i_size))
 		return 0;
 
 	/* optimization for short read */
-	if (async_dio && rw != WRITE && offset + count > i_size) {
+	if (async_dio && iov_iter_rw(iter) != WRITE && offset + count > i_size) {
 		if (offset >= i_size)
 			return 0;
-		count = min_t(loff_t, count, fuse_round_up(i_size - offset));
-		iov_iter_truncate(iter, count);
+		iov_iter_truncate(iter, fuse_round_up(i_size - offset));
+		count = iov_iter_count(iter);
 	}
 
 	io = kmalloc(sizeof(struct fuse_io_priv), GFP_KERNEL);
@@ -2834,7 +2810,7 @@ fuse_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
 	io->bytes = -1;
 	io->size = 0;
 	io->offset = offset;
-	io->write = (rw == WRITE);
+	io->write = (iov_iter_rw(iter) == WRITE);
 	io->err = 0;
 	io->file = file;
 	/*
@@ -2849,13 +2825,19 @@ fuse_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
 	 * to wait on real async I/O requests, so we must submit this request
 	 * synchronously.
 	 */
-	if (!is_sync_kiocb(iocb) && (offset + count > i_size) && rw == WRITE)
+	if (!is_sync_kiocb(iocb) && (offset + count > i_size) &&
+	    iov_iter_rw(iter) == WRITE)
 		io->async = false;
 
-	if (rw == WRITE)
-		ret = __fuse_direct_write(io, iter, &pos);
-	else
+	if (io->async && is_sync_kiocb(iocb))
+		io->done = &wait;
+
+	if (iov_iter_rw(iter) == WRITE) {
+		ret = fuse_direct_io(io, iter, &pos, FUSE_DIO_WRITE);
+		fuse_invalidate_attr(inode);
+	} else {
 		ret = __fuse_direct_read(io, iter, &pos);
+	}
 
 	if (io->async) {
 		fuse_aio_complete(io, ret < 0 ? ret : 0, -1);
@@ -2864,12 +2846,13 @@ fuse_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
 		if (!is_sync_kiocb(iocb))
 			return -EIOCBQUEUED;
 
-		ret = wait_on_sync_kiocb(iocb);
-	} else {
-		kfree(io);
+		wait_for_completion(&wait);
+		ret = fuse_get_res_by_io(io);
 	}
 
-	if (rw == WRITE) {
+	kfree(io);
+
+	if (iov_iter_rw(iter) == WRITE) {
 		if (ret > 0)
 			fuse_write_update_size(inode, pos);
 		else if (ret < 0 && offset + count > i_size)
@@ -2957,9 +2940,7 @@ out:
 
 static const struct file_operations fuse_file_operations = {
 	.llseek		= fuse_file_llseek,
-	.read		= new_sync_read,
 	.read_iter	= fuse_file_read_iter,
-	.write		= new_sync_write,
 	.write_iter	= fuse_file_write_iter,
 	.mmap		= fuse_file_mmap,
 	.open		= fuse_open,
@@ -2977,8 +2958,8 @@ static const struct file_operations fuse_file_operations = {
 
 static const struct file_operations fuse_direct_io_file_operations = {
 	.llseek		= fuse_file_llseek,
-	.read		= fuse_direct_read,
-	.write		= fuse_direct_write,
+	.read_iter	= fuse_direct_read_iter,
+	.write_iter	= fuse_direct_write_iter,
 	.mmap		= fuse_direct_mmap,
 	.open		= fuse_open,
 	.flush		= fuse_flush,
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 1cdfb07c1376..7354dc142a50 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -263,6 +263,7 @@ struct fuse_io_priv {
 	int err;
 	struct kiocb *iocb;
 	struct file *file;
+	struct completion *done;
 };
 
 /**