From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 3 Apr 2015 03:30:18 +0000 (-0400)
Subject: ncpfs: switch to ->read_iter/->write_iter
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=274a48869b26c53c641f146b312486e1693f4d61;p=openwrt%2Fstaging%2Fblogic.git

ncpfs: switch to ->read_iter/->write_iter

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

diff --git a/fs/ncpfs/file.c b/fs/ncpfs/file.c
index 1dd7007f974d..5f9d5624e377 100644
--- a/fs/ncpfs/file.c
+++ b/fs/ncpfs/file.c
@@ -98,30 +98,24 @@ out:
 }
 
 static ssize_t
-ncp_file_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+ncp_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 {
+	struct file *file = iocb->ki_filp;
 	struct inode *inode = file_inode(file);
 	size_t already_read = 0;
-	off_t pos;
+	off_t pos = iocb->ki_pos;
 	size_t bufsize;
 	int error;
-	void* freepage;
+	void *freepage;
 	size_t freelen;
 
 	ncp_dbg(1, "enter %pD2\n", file);
 
-	pos = *ppos;
-
-	if ((ssize_t) count < 0) {
-		return -EINVAL;
-	}
-	if (!count)
+	if (!iov_iter_count(to))
 		return 0;
 	if (pos > inode->i_sb->s_maxbytes)
 		return 0;
-	if (pos + count > inode->i_sb->s_maxbytes) {
-		count = inode->i_sb->s_maxbytes - pos;
-	}
+	iov_iter_truncate(to, inode->i_sb->s_maxbytes - pos);
 
 	error = ncp_make_open(inode, O_RDONLY);
 	if (error) {
@@ -138,31 +132,29 @@ ncp_file_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 		goto outrel;
 	error = 0;
 	/* First read in as much as possible for each bufsize. */
-	while (already_read < count) {
+	while (iov_iter_count(to)) {
 		int read_this_time;
-		size_t to_read = min_t(unsigned int,
+		size_t to_read = min_t(size_t,
 				     bufsize - (pos % bufsize),
-				     count - already_read);
+				     iov_iter_count(to));
 
 		error = ncp_read_bounce(NCP_SERVER(inode),
 			 	NCP_FINFO(inode)->file_handle,
-				pos, to_read, buf, &read_this_time, 
+				pos, to_read, to, &read_this_time, 
 				freepage, freelen);
 		if (error) {
 			error = -EIO;	/* NW errno -> Linux errno */
 			break;
 		}
 		pos += read_this_time;
-		buf += read_this_time;
 		already_read += read_this_time;
 
-		if (read_this_time != to_read) {
+		if (read_this_time != to_read)
 			break;
-		}
 	}
 	vfree(freepage);
 
-	*ppos = pos;
+	iocb->ki_pos = pos;
 
 	file_accessed(file);
 
@@ -173,42 +165,26 @@ outrel:
 }
 
 static ssize_t
-ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+ncp_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 {
+	struct file *file = iocb->ki_filp;
 	struct inode *inode = file_inode(file);
 	size_t already_written = 0;
-	off_t pos;
+	loff_t pos = iocb->ki_pos;
+	size_t count = iov_iter_count(from);
 	size_t bufsize;
 	int errno;
-	void* bouncebuffer;
+	void *bouncebuffer;
 
 	ncp_dbg(1, "enter %pD2\n", file);
-	if ((ssize_t) count < 0)
-		return -EINVAL;
-	pos = *ppos;
-	if (file->f_flags & O_APPEND) {
-		pos = i_size_read(inode);
-	}
-
-	if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) {
-		if (pos >= MAX_NON_LFS) {
-			return -EFBIG;
-		}
-		if (count > MAX_NON_LFS - (u32)pos) {
-			count = MAX_NON_LFS - (u32)pos;
-		}
-	}
-	if (pos >= inode->i_sb->s_maxbytes) {
-		if (count || pos > inode->i_sb->s_maxbytes) {
-			return -EFBIG;
-		}
-	}
-	if (pos + count > inode->i_sb->s_maxbytes) {
-		count = inode->i_sb->s_maxbytes - pos;
-	}
+	errno = generic_write_checks(file, &pos, &count, 0);
+	if (errno)
+		return errno;
+	iov_iter_truncate(from, count);
 	
 	if (!count)
 		return 0;
+
 	errno = ncp_make_open(inode, O_WRONLY);
 	if (errno) {
 		ncp_dbg(1, "open failed, error=%d\n", errno);
@@ -216,8 +192,6 @@ ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *
 	}
 	bufsize = NCP_SERVER(inode)->buffer_size;
 
-	already_written = 0;
-
 	errno = file_update_time(file);
 	if (errno)
 		goto outrel;
@@ -227,13 +201,13 @@ ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *
 		errno = -EIO;	/* -ENOMEM */
 		goto outrel;
 	}
-	while (already_written < count) {
+	while (iov_iter_count(from)) {
 		int written_this_time;
-		size_t to_write = min_t(unsigned int,
-				      bufsize - (pos % bufsize),
-				      count - already_written);
+		size_t to_write = min_t(size_t,
+				      bufsize - ((off_t)pos % bufsize),
+				      iov_iter_count(from));
 
-		if (copy_from_user(bouncebuffer, buf, to_write)) {
+		if (copy_from_iter(bouncebuffer, to_write, from) != to_write) {
 			errno = -EFAULT;
 			break;
 		}
@@ -244,16 +218,14 @@ ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *
 			break;
 		}
 		pos += written_this_time;
-		buf += written_this_time;
 		already_written += written_this_time;
 
-		if (written_this_time != to_write) {
+		if (written_this_time != to_write)
 			break;
-		}
 	}
 	vfree(bouncebuffer);
 
-	*ppos = pos;
+	iocb->ki_pos = pos;
 
 	if (pos > i_size_read(inode)) {
 		mutex_lock(&inode->i_mutex);
@@ -277,8 +249,10 @@ static int ncp_release(struct inode *inode, struct file *file) {
 const struct file_operations ncp_file_operations =
 {
 	.llseek		= generic_file_llseek,
-	.read		= ncp_file_read,
-	.write		= ncp_file_write,
+	.read		= new_sync_read,
+	.write		= new_sync_write,
+	.read_iter	= ncp_file_read_iter,
+	.write_iter	= ncp_file_write_iter,
 	.unlocked_ioctl	= ncp_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= ncp_compat_ioctl,
diff --git a/fs/ncpfs/ncplib_kernel.c b/fs/ncpfs/ncplib_kernel.c
index 482387532f54..2b502a0d7941 100644
--- a/fs/ncpfs/ncplib_kernel.c
+++ b/fs/ncpfs/ncplib_kernel.c
@@ -1001,8 +1001,8 @@ out:
  */
 int
 ncp_read_bounce(struct ncp_server *server, const char *file_id,
-	 __u32 offset, __u16 to_read, char __user *target, int *bytes_read,
-	 void* bounce, __u32 bufsize)
+	 __u32 offset, __u16 to_read, struct iov_iter *to,
+	 int *bytes_read, void *bounce, __u32 bufsize)
 {
 	int result;
 
@@ -1025,7 +1025,7 @@ ncp_read_bounce(struct ncp_server *server, const char *file_id,
 			         (offset & 1);
 			*bytes_read = len;
 			result = 0;
-			if (copy_to_user(target, source, len))
+			if (copy_to_iter(source, len, to) != len)
 				result = -EFAULT;
 		}
 	}
diff --git a/fs/ncpfs/ncplib_kernel.h b/fs/ncpfs/ncplib_kernel.h
index 250e443a07f3..5233fbc1747a 100644
--- a/fs/ncpfs/ncplib_kernel.h
+++ b/fs/ncpfs/ncplib_kernel.h
@@ -53,7 +53,7 @@ static inline int ncp_read_bounce_size(__u32 size) {
 	return sizeof(struct ncp_reply_header) + 2 + 2 + size + 8;
 };
 int ncp_read_bounce(struct ncp_server *, const char *, __u32, __u16, 
-		char __user *, int *, void* bounce, __u32 bouncelen);
+		struct iov_iter *, int *, void *bounce, __u32 bouncelen);
 int ncp_read_kernel(struct ncp_server *, const char *, __u32, __u16, 
 		char *, int *);
 int ncp_write_kernel(struct ncp_server *, const char *, __u32, __u16,