net: hns3: Fix for information of phydev lost problem when down/up

[mirror_ubuntu-bionic-kernel.git] / fs / read_write.c

diff --git a/fs/read_write.c b/fs/read_write.c
index f8547b82dfb36e6e0a39fb91520addbc4b5a2d75..d423a5fa3f5faa9ff2b3374dfbb0b9e3c8b987a6 100644 (file)
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -454,6 +454,7 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
 
        return ret;
 }
+EXPORT_SYMBOL_GPL(vfs_read);
 
 static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
 {
@@ -484,6 +485,30 @@ ssize_t __vfs_write(struct file *file, const char __user *p, size_t count,
                return -EINVAL;
 }
 
+vfs_readf_t vfs_readf(struct file *file)
+{
+       const struct file_operations *fop = file->f_op;
+
+       if (fop->read)
+               return fop->read;
+       if (fop->read_iter)
+               return new_sync_read;
+       return ERR_PTR(-ENOSYS);
+}
+EXPORT_SYMBOL_GPL(vfs_readf);
+
+vfs_writef_t vfs_writef(struct file *file)
+{
+       const struct file_operations *fop = file->f_op;
+
+       if (fop->write)
+               return fop->write;
+       if (fop->write_iter)
+               return new_sync_write;
+       return ERR_PTR(-ENOSYS);
+}
+EXPORT_SYMBOL_GPL(vfs_writef);
+
 ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t *pos)
 {
        mm_segment_t old_fs;
@@ -552,6 +577,7 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
 
        return ret;
 }
+EXPORT_SYMBOL_GPL(vfs_write);
 
 static inline loff_t file_pos_read(struct file *file)
 {