linux-kernel - [PATCH 12/23] fs: remove __vfs

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Message-Id: <20200701200951.3603160-13-hch@lst.de>
Date:   Wed,  1 Jul 2020 22:09:40 +0200
From:   Christoph Hellwig <hch@....de>
To:     Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Luis Chamberlain <mcgrof@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH 12/23] fs: remove __vfs_read

Fold it into the two callers.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 fs/read_write.c    | 43 +++++++++++++++++++++----------------------
 include/linux/fs.h |  1 -
 2 files changed, 21 insertions(+), 23 deletions(-)

diff --git a/fs/read_write.c b/fs/read_write.c
index a0a0b5d1d9249c..6a2170eaee64f9 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -419,17 +419,6 @@ static ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, lo
 	return ret;
 }
 
-ssize_t __vfs_read(struct file *file, char __user *buf, size_t count,
-		   loff_t *pos)
-{
-	if (file->f_op->read)
-		return file->f_op->read(file, buf, count, pos);
-	else if (file->f_op->read_iter)
-		return new_sync_read(file, buf, count, pos);
-	else
-		return -EINVAL;
-}
-
 ssize_t __kernel_read(struct file *file, void *buf, size_t count, loff_t *pos)
 {
 	mm_segment_t old_fs = get_fs();
@@ -443,7 +432,12 @@ ssize_t __kernel_read(struct file *file, void *buf, size_t count, loff_t *pos)
 	if (count > MAX_RW_COUNT)
 		count =  MAX_RW_COUNT;
 	set_fs(KERNEL_DS);
-	ret = __vfs_read(file, (void __user *)buf, count, pos);
+	if (file->f_op->read)
+		ret = file->f_op->read(file, (void __user *)buf, count, pos);
+	else if (file->f_op->read_iter)
+		ret = new_sync_read(file, (void __user *)buf, count, pos);
+	else
+		ret = -EINVAL;
 	set_fs(old_fs);
 	if (ret > 0) {
 		fsnotify_access(file);
@@ -476,17 +470,22 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
 		return -EFAULT;
 
 	ret = rw_verify_area(READ, file, pos, count);
-	if (!ret) {
-		if (count > MAX_RW_COUNT)
-			count =  MAX_RW_COUNT;
-		ret = __vfs_read(file, buf, count, pos);
-		if (ret > 0) {
-			fsnotify_access(file);
-			add_rchar(current, ret);
-		}
-		inc_syscr(current);
-	}
+	if (ret)
+		return ret;
+	if (count > MAX_RW_COUNT)
+		count =  MAX_RW_COUNT;
 
+	if (file->f_op->read)
+		ret = file->f_op->read(file, buf, count, pos);
+	else if (file->f_op->read_iter)
+		ret = new_sync_read(file, buf, count, pos);
+	else
+		ret = -EINVAL;
+	if (ret > 0) {
+		fsnotify_access(file);
+		add_rchar(current, ret);
+	}
+	inc_syscr(current);
 	return ret;
 }
 
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 22cbe7b2e91994..0c0ec76b600b50 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1917,7 +1917,6 @@ ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
 			      struct iovec *fast_pointer,
 			      struct iovec **ret_pointer);
 
-extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *);
 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
-- 
2.26.2