write_iter variants of {__,}generic_file_aio_write()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

29 files changed, 94 insertions, 79 deletions

diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index 47e0597..b9b5f97 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -763,7 +763,7 @@ err_out:
 
 buff_write:
 	mutex_unlock(&inode->i_mutex);
-	return do_sync_write(filp, data, count, offsetp);
+	return new_sync_write(filp, data, count, offsetp);
 }
 
 /**
@@ -781,7 +781,7 @@ v9fs_cached_file_write(struct file *filp, const char __user * data,
 
 	if (filp->f_flags & O_DIRECT)
 		return v9fs_direct_write(filp, data, count, offset);
-	return do_sync_write(filp, data, count, offset);
+	return new_sync_write(filp, data, count, offset);
 }
 
 
@@ -851,7 +851,7 @@ const struct file_operations v9fs_cached_file_operations = {
 	.read = v9fs_cached_file_read,
 	.write = v9fs_cached_file_write,
 	.read_iter = generic_file_read_iter,
-	.aio_write = generic_file_aio_write,
+	.write_iter = generic_file_write_iter,
 	.open = v9fs_file_open,
 	.release = v9fs_dir_release,
 	.lock = v9fs_file_lock,
@@ -864,7 +864,7 @@ const struct file_operations v9fs_cached_file_operations_dotl = {
 	.read = v9fs_cached_file_read,
 	.write = v9fs_cached_file_write,
 	.read_iter = generic_file_read_iter,
-	.aio_write = generic_file_aio_write,
+	.write_iter = generic_file_write_iter,
 	.open = v9fs_file_open,
 	.release = v9fs_dir_release,
 	.lock = v9fs_file_lock_dotl,
diff --git a/fs/adfs/file.c b/fs/adfs/file.c
index 3bfc9ef..07c9edc 100644
--- a/fs/adfs/file.c
+++ b/fs/adfs/file.c
@@ -27,8 +27,8 @@ const struct file_operations adfs_file_operations = {
 	.read_iter	= generic_file_read_iter,
 	.mmap		= generic_file_mmap,
 	.fsync		= generic_file_fsync,
-	.write		= do_sync_write,
-	.aio_write	= generic_file_aio_write,
+	.write		= new_sync_write,
+	.write_iter	= generic_file_write_iter,
 	.splice_read	= generic_file_splice_read,
 };
 
diff --git a/fs/affs/file.c b/fs/affs/file.c
index 982853f..9df2317 100644
--- a/fs/affs/file.c
+++ b/fs/affs/file.c
@@ -29,8 +29,8 @@ const struct file_operations affs_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= new_sync_read,
 	.read_iter	= generic_file_read_iter,
-	.write		= do_sync_write,
-	.aio_write	= generic_file_aio_write,
+	.write		= new_sync_write,
+	.write_iter	= generic_file_write_iter,
 	.mmap		= generic_file_mmap,
 	.open		= affs_file_open,
 	.release	= affs_file_release,
diff --git a/fs/bfs/file.c b/fs/bfs/file.c
index 0aa7888..e7f88ac 100644
--- a/fs/bfs/file.c
+++ b/fs/bfs/file.c
@@ -25,8 +25,8 @@ const struct file_operations bfs_file_operations = {
 	.llseek 	= generic_file_llseek,
 	.read		= new_sync_read,
 	.read_iter	= generic_file_read_iter,
-	.write		= do_sync_write,
-	.aio_write	= generic_file_aio_write,
+	.write		= new_sync_write,
+	.write_iter	= generic_file_write_iter,
 	.mmap		= generic_file_mmap,
 	.splice_read	= generic_file_splice_read,
 };
diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index b32827c..db0fad3 100644
--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -353,8 +353,8 @@ const struct file_operations ecryptfs_main_fops = {
 	.llseek = generic_file_llseek,
 	.read = new_sync_read,
 	.read_iter = ecryptfs_read_update_atime,
-	.write = do_sync_write,
-	.aio_write = generic_file_aio_write,
+	.write = new_sync_write,
+	.write_iter = generic_file_write_iter,
 	.iterate = ecryptfs_readdir,
 	.unlocked_ioctl = ecryptfs_unlocked_ioctl,
 #ifdef CONFIG_COMPAT
diff --git a/fs/exofs/file.c b/fs/exofs/file.c
index 90d394da..5b7f6be 100644
--- a/fs/exofs/file.c
+++ b/fs/exofs/file.c
@@ -68,9 +68,9 @@ static int exofs_flush(struct file *file, fl_owner_t id)
 const struct file_operations exofs_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= new_sync_read,
-	.write		= do_sync_write,
+	.write		= new_sync_write,
 	.read_iter	= generic_file_read_iter,
-	.aio_write	= generic_file_aio_write,
+	.write_iter	= generic_file_write_iter,
 	.mmap		= generic_file_mmap,
 	.open		= generic_file_open,
 	.release	= exofs_release_file,
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index 4073050..970c6ac 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -63,9 +63,9 @@ int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
 const struct file_operations ext2_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= new_sync_read,
-	.write		= do_sync_write,
+	.write		= new_sync_write,
 	.read_iter	= generic_file_read_iter,
-	.aio_write	= generic_file_aio_write,
+	.write_iter	= generic_file_write_iter,
 	.unlocked_ioctl = ext2_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= ext2_compat_ioctl,
diff --git a/fs/ext3/file.c b/fs/ext3/file.c
index 5439d2f..c833b12 100644
--- a/fs/ext3/file.c
+++ b/fs/ext3/file.c
@@ -51,9 +51,9 @@ static int ext3_release_file (struct inode * inode, struct file * filp)
 const struct file_operations ext3_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= new_sync_read,
-	.write		= do_sync_write,
+	.write		= new_sync_write,
 	.read_iter	= generic_file_read_iter,
-	.aio_write	= generic_file_aio_write,
+	.write_iter	= generic_file_write_iter,
 	.unlocked_ioctl	= ext3_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= ext3_compat_ioctl,
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 0e01fb0..22f4900 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -680,9 +680,9 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 const struct file_operations f2fs_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= new_sync_read,
-	.write		= do_sync_write,
+	.write		= new_sync_write,
 	.read_iter	= generic_file_read_iter,
-	.aio_write	= generic_file_aio_write,
+	.write_iter	= generic_file_write_iter,
 	.open		= generic_file_open,
 	.mmap		= f2fs_file_mmap,
 	.fsync		= f2fs_sync_file,
diff --git a/fs/fat/file.c b/fs/fat/file.c
index 29285e9..85f79a8 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -171,9 +171,9 @@ int fat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
 const struct file_operations fat_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= new_sync_read,
-	.write		= do_sync_write,
+	.write		= new_sync_write,
 	.read_iter	= generic_file_read_iter,
-	.aio_write	= generic_file_aio_write,
+	.write_iter	= generic_file_write_iter,
 	.mmap		= generic_file_mmap,
 	.release	= fat_file_release,
 	.unlocked_ioctl	= fat_generic_ioctl,
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index 6d4055a..d0929bc 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -676,8 +676,8 @@ static const struct file_operations hfs_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= new_sync_read,
 	.read_iter	= generic_file_read_iter,
-	.write		= do_sync_write,
-	.aio_write	= generic_file_aio_write,
+	.write		= new_sync_write,
+	.write_iter	= generic_file_write_iter,
 	.mmap		= generic_file_mmap,
 	.splice_read	= generic_file_splice_read,
 	.fsync		= hfs_file_fsync,
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index cccc89e..0cf786f 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -343,8 +343,8 @@ static const struct file_operations hfsplus_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= new_sync_read,
 	.read_iter	= generic_file_read_iter,
-	.write		= do_sync_write,
-	.aio_write	= generic_file_aio_write,
+	.write		= new_sync_write,
+	.write_iter	= generic_file_write_iter,
 	.mmap		= generic_file_mmap,
 	.splice_read	= generic_file_splice_read,
 	.fsync		= hfsplus_file_fsync,
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index ce0005d..bb529f3 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -381,8 +381,8 @@ static const struct file_operations hostfs_file_fops = {
 	.read		= new_sync_read,
 	.splice_read	= generic_file_splice_read,
 	.read_iter	= generic_file_read_iter,
-	.aio_write	= generic_file_aio_write,
-	.write		= do_sync_write,
+	.write_iter	= generic_file_write_iter,
+	.write		= new_sync_write,
 	.mmap		= generic_file_mmap,
 	.open		= hostfs_file_open,
 	.release	= hostfs_file_release,
diff --git a/fs/hpfs/file.c b/fs/hpfs/file.c
index bacb478..7f54e5f 100644
--- a/fs/hpfs/file.c
+++ b/fs/hpfs/file.c
@@ -199,8 +199,8 @@ const struct file_operations hpfs_file_ops =
 	.llseek		= generic_file_llseek,
 	.read		= new_sync_read,
 	.read_iter	= generic_file_read_iter,
-	.write		= do_sync_write,
-	.aio_write	= generic_file_aio_write,
+	.write		= new_sync_write,
+	.write_iter	= generic_file_write_iter,
 	.mmap		= generic_file_mmap,
 	.release	= hpfs_file_release,
 	.fsync		= hpfs_file_fsync,
diff --git a/fs/jffs2/file.c b/fs/jffs2/file.c
index 9192127..64989ca9 100644
--- a/fs/jffs2/file.c
+++ b/fs/jffs2/file.c
@@ -53,8 +53,8 @@ const struct file_operations jffs2_file_operations =
 	.open =		generic_file_open,
  	.read =		new_sync_read,
  	.read_iter =	generic_file_read_iter,
- 	.write =	do_sync_write,
- 	.aio_write =	generic_file_aio_write,
+ 	.write =	new_sync_write,
+ 	.write_iter =	generic_file_write_iter,
 	.unlocked_ioctl=jffs2_ioctl,
 	.mmap =		generic_file_readonly_mmap,
 	.fsync =	jffs2_fsync,
diff --git a/fs/jfs/file.c b/fs/jfs/file.c
index a5d8299..cc744ec 100644
--- a/fs/jfs/file.c
+++ b/fs/jfs/file.c
@@ -151,10 +151,10 @@ const struct inode_operations jfs_file_inode_operations = {
 const struct file_operations jfs_file_operations = {
 	.open		= jfs_open,
 	.llseek		= generic_file_llseek,
-	.write		= do_sync_write,
+	.write		= new_sync_write,
 	.read		= new_sync_read,
 	.read_iter	= generic_file_read_iter,
-	.aio_write	= generic_file_aio_write,
+	.write_iter	= generic_file_write_iter,
 	.mmap		= generic_file_mmap,
 	.splice_read	= generic_file_splice_read,
 	.splice_write	= generic_file_splice_write,
diff --git a/fs/logfs/file.c b/fs/logfs/file.c
index 1ca8026d..8538752 100644
--- a/fs/logfs/file.c
+++ b/fs/logfs/file.c
@@ -265,14 +265,14 @@ const struct inode_operations logfs_reg_iops = {
 
 const struct file_operations logfs_reg_fops = {
 	.read_iter	= generic_file_read_iter,
-	.aio_write	= generic_file_aio_write,
+	.write_iter	= generic_file_write_iter,
 	.fsync		= logfs_fsync,
 	.unlocked_ioctl	= logfs_ioctl,
 	.llseek		= generic_file_llseek,
 	.mmap		= generic_file_readonly_mmap,
 	.open		= generic_file_open,
 	.read		= new_sync_read,
-	.write		= do_sync_write,
+	.write		= new_sync_write,
 };
 
 const struct address_space_operations logfs_reg_aops = {
diff --git a/fs/minix/file.c b/fs/minix/file.c
index 607b471..a967de0 100644
--- a/fs/minix/file.c
+++ b/fs/minix/file.c
@@ -16,8 +16,8 @@ const struct file_operations minix_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= new_sync_read,
 	.read_iter	= generic_file_read_iter,
-	.write		= do_sync_write,
-	.aio_write	= generic_file_aio_write,
+	.write		= new_sync_write,
+	.write_iter	= generic_file_write_iter,
 	.mmap		= generic_file_mmap,
 	.fsync		= generic_file_fsync,
 	.splice_read	= generic_file_splice_read,
diff --git a/fs/nilfs2/file.c b/fs/nilfs2/file.c
index dcb1b0e..2497815 100644
--- a/fs/nilfs2/file.c
+++ b/fs/nilfs2/file.c
@@ -153,9 +153,9 @@ static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
 const struct file_operations nilfs_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= new_sync_read,
-	.write		= do_sync_write,
+	.write		= new_sync_write,
 	.read_iter	= generic_file_read_iter,
-	.aio_write	= generic_file_aio_write,
+	.write_iter	= generic_file_write_iter,
 	.unlocked_ioctl	= nilfs_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= nilfs_compat_ioctl,
diff --git a/fs/omfs/file.c b/fs/omfs/file.c
index 3bf28da..902e885 100644
--- a/fs/omfs/file.c
+++ b/fs/omfs/file.c
@@ -338,9 +338,9 @@ static sector_t omfs_bmap(struct address_space *mapping, sector_t block)
 const struct file_operations omfs_file_operations = {
 	.llseek = generic_file_llseek,
 	.read = new_sync_read,
-	.write = do_sync_write,
+	.write = new_sync_write,
 	.read_iter = generic_file_read_iter,
-	.aio_write = generic_file_aio_write,
+	.write_iter = generic_file_write_iter,
 	.mmap = generic_file_mmap,
 	.fsync = generic_file_fsync,
 	.splice_read = generic_file_splice_read,
diff --git a/fs/ramfs/file-mmu.c b/fs/ramfs/file-mmu.c
index 30ffb36..6ea0b97 100644
--- a/fs/ramfs/file-mmu.c
+++ b/fs/ramfs/file-mmu.c
@@ -33,8 +33,8 @@
 const struct file_operations ramfs_file_operations = {
 	.read		= new_sync_read,
 	.read_iter	= generic_file_read_iter,
-	.write		= do_sync_write,
-	.aio_write	= generic_file_aio_write,
+	.write		= new_sync_write,
+	.write_iter	= generic_file_write_iter,
 	.mmap		= generic_file_mmap,
 	.fsync		= noop_fsync,
 	.splice_read	= generic_file_splice_read,
diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index 416db04..9ed420f 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -39,8 +39,8 @@ const struct file_operations ramfs_file_operations = {
 	.get_unmapped_area	= ramfs_nommu_get_unmapped_area,
 	.read			= new_sync_read,
 	.read_iter		= generic_file_read_iter,
-	.write			= do_sync_write,
-	.aio_write		= generic_file_aio_write,
+	.write			= new_sync_write,
+	.write_iter		= generic_file_write_iter,
 	.fsync			= noop_fsync,
 	.splice_read		= generic_file_splice_read,
 	.splice_write		= generic_file_splice_write,
diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c
index 7592d68..7c8ecd6 100644
--- a/fs/reiserfs/file.c
+++ b/fs/reiserfs/file.c
@@ -236,7 +236,7 @@ int reiserfs_commit_page(struct inode *inode, struct page *page,
 
 const struct file_operations reiserfs_file_operations = {
 	.read = new_sync_read,
-	.write = do_sync_write,
+	.write = new_sync_write,
 	.unlocked_ioctl = reiserfs_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl = reiserfs_compat_ioctl,
@@ -246,7 +246,7 @@ const struct file_operations reiserfs_file_operations = {
 	.release = reiserfs_file_release,
 	.fsync = reiserfs_sync_file,
 	.read_iter = generic_file_read_iter,
-	.aio_write = generic_file_aio_write,
+	.write_iter = generic_file_write_iter,
 	.splice_read = generic_file_splice_read,
 	.splice_write = generic_file_splice_write,
 	.llseek = generic_file_llseek,
diff --git a/fs/sysv/file.c b/fs/sysv/file.c
index d99be88..b00811c 100644
--- a/fs/sysv/file.c
+++ b/fs/sysv/file.c
@@ -23,8 +23,8 @@ const struct file_operations sysv_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= new_sync_read,
 	.read_iter	= generic_file_read_iter,
-	.write		= do_sync_write,
-	.aio_write	= generic_file_aio_write,
+	.write		= new_sync_write,
+	.write_iter	= generic_file_write_iter,
 	.mmap		= generic_file_mmap,
 	.fsync		= generic_file_fsync,
 	.splice_read	= generic_file_splice_read,
diff --git a/fs/ufs/file.c b/fs/ufs/file.c
index b6b4029..c84ec01 100644
--- a/fs/ufs/file.c
+++ b/fs/ufs/file.c
@@ -37,8 +37,8 @@ const struct file_operations ufs_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= new_sync_read,
 	.read_iter	= generic_file_read_iter,
-	.write		= do_sync_write,
-	.aio_write	= generic_file_aio_write,
+	.write		= new_sync_write,
+	.write_iter	= generic_file_write_iter,
 	.mmap		= generic_file_mmap,
 	.open           = generic_file_open,
 	.fsync		= generic_file_fsync,
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 17535e0..4b22163 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2414,7 +2414,9 @@ int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isbl
 extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
 extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *);
 extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long);
+extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *);
 extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
+extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *);
 extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *, loff_t);
 extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t);
 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
diff --git a/mm/filemap.c b/mm/filemap.c
index c0404b7..d2d9eee 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2542,10 +2542,9 @@ again:
 EXPORT_SYMBOL(generic_perform_write);
 
 /**
- * __generic_file_aio_write - write data to a file
+ * __generic_file_write_iter - write data to a file
  * @iocb:	IO state structure (file, offset, etc.)
- * @iov:	vector with data to write
- * @nr_segs:	number of segments in the vector
+ * @from:	iov_iter with data to write
  *
  * This function does all the work needed for actually writing data to a
  * file. It does all basic checks, removes SUID from the file, updates
@@ -2559,21 +2558,16 @@ EXPORT_SYMBOL(generic_perform_write);
  * A caller has to handle it. This is mainly due to the fact that we want to
  * avoid syncing under i_mutex.
  */
-ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
-				 unsigned long nr_segs)
+ssize_t __generic_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;		/* after file limit checks */
 	struct inode 	*inode = mapping->host;
 	loff_t		pos = iocb->ki_pos;
 	ssize_t		written = 0;
 	ssize_t		err;
 	ssize_t		status;
-	struct iov_iter from;
-
-	count = iov_length(iov, nr_segs);
-	iov_iter_init(&from, WRITE, iov, nr_segs, count);
+	size_t		count = iov_iter_count(from);
 
 	/* We can write back this queue in page reclaim */
 	current->backing_dev_info = mapping->backing_dev_info;
@@ -2584,7 +2578,7 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 	if (count == 0)
 		goto out;
 
-	iov_iter_truncate(&from, count);
+	iov_iter_truncate(from, count);
 
 	err = file_remove_suid(file);
 	if (err)
@@ -2598,7 +2592,7 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 	if (unlikely(file->f_flags & O_DIRECT)) {
 		loff_t endbyte;
 
-		written = generic_file_direct_write(iocb, &from, pos);
+		written = generic_file_direct_write(iocb, from, pos);
 		if (written < 0 || written == count)
 			goto out;
 
@@ -2609,7 +2603,7 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 		pos += written;
 		count -= written;
 
-		status = generic_perform_write(file, &from, pos);
+		status = generic_perform_write(file, from, pos);
 		/*
 		 * If generic_perform_write() returned a synchronous error
 		 * then we want to return the number of bytes which were
@@ -2641,7 +2635,7 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 			 */
 		}
 	} else {
-		written = generic_perform_write(file, &from, pos);
+		written = generic_perform_write(file, from, pos);
 		if (likely(written >= 0))
 			iocb->ki_pos = pos + written;
 	}
@@ -2649,30 +2643,36 @@ out:
 	current->backing_dev_info = NULL;
 	return written ? written : err;
 }
+EXPORT_SYMBOL(__generic_file_write_iter);
+
+ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
+				 unsigned long nr_segs)
+{
+	size_t count = iov_length(iov, nr_segs);
+	struct iov_iter from;
+
+	iov_iter_init(&from, WRITE, iov, nr_segs, count);
+	return __generic_file_write_iter(iocb, &from);
+}
 EXPORT_SYMBOL(__generic_file_aio_write);
 
 /**
- * generic_file_aio_write - write data to a file
+ * generic_file_write_iter - write data to a file
  * @iocb:	IO state structure
- * @iov:	vector with data to write
- * @nr_segs:	number of segments in the vector
- * @pos:	position in file where to write
+ * @from:	iov_iter with data to write
  *
- * This is a wrapper around __generic_file_aio_write() to be used by most
+ * This is a wrapper around __generic_file_write_iter() to be used by most
  * filesystems. It takes care of syncing the file in case of O_SYNC file
  * and acquires i_mutex as needed.
  */
-ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
-		unsigned long nr_segs, loff_t pos)
+ssize_t generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 {
 	struct file *file = iocb->ki_filp;
 	struct inode *inode = file->f_mapping->host;
 	ssize_t ret;
 
-	BUG_ON(iocb->ki_pos != pos);
-
 	mutex_lock(&inode->i_mutex);
-	ret = __generic_file_aio_write(iocb, iov, nr_segs);
+	ret = __generic_file_write_iter(iocb, from);
 	mutex_unlock(&inode->i_mutex);
 
 	if (ret > 0) {
@@ -2684,6 +2684,19 @@ ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 	}
 	return ret;
 }
+EXPORT_SYMBOL(generic_file_write_iter);
+
+ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
+		unsigned long nr_segs, loff_t pos)
+{
+	size_t count = iov_length(iov, nr_segs);
+	struct iov_iter from;
+
+	BUG_ON(iocb->ki_pos != pos);
+
+	iov_iter_init(&from, WRITE, iov, nr_segs, count);
+	return generic_file_write_iter(iocb, &from);
+}
 EXPORT_SYMBOL(generic_file_aio_write);
 
 /**
diff --git a/mm/shmem.c b/mm/shmem.c
index edc6c7e..d3e5c6fc3 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2618,9 +2618,9 @@ static const struct file_operations shmem_file_operations = {
 #ifdef CONFIG_TMPFS
 	.llseek		= shmem_file_llseek,
 	.read		= new_sync_read,
-	.write		= do_sync_write,
+	.write		= new_sync_write,
 	.read_iter	= shmem_file_read_iter,
-	.aio_write	= generic_file_aio_write,
+	.write_iter	= generic_file_write_iter,
 	.fsync		= noop_fsync,
 	.splice_read	= shmem_file_splice_read,
 	.splice_write	= generic_file_splice_write,
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 32c661d..9c2dba6 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -458,7 +458,7 @@ static pageout_t pageout(struct page *page, struct address_space *mapping,
 	 * stalls if we need to run get_block().  We could test
 	 * PagePrivate for that.
 	 *
-	 * If this process is currently in __generic_file_aio_write() against
+	 * If this process is currently in __generic_file_write_iter() against
 	 * this page's queue, we can perform writeback even if that
 	 * will block.
 	 *