[PATCH v4 6/6] VFS: refactor vfs_read()

[Dmitry Kasatkin]

integrity_kernel_read() duplicates the file read operations code
in vfs_read(). This patch refactors vfs_read() code creating a
helper function __vfs_read(). It is used by both vfs_read() and
integrity_kernel_read().

Signed-off-by: Dmitry Kasatkin <d.kasat...@samsung.com>
---
 fs/read_write.c           | 24 ++++++++++++++++++------
 include/linux/fs.h        |  1 +
 security/integrity/iint.c | 10 +++-------
 3 files changed, 22 insertions(+), 13 deletions(-)

diff --git a/fs/read_write.c b/fs/read_write.c
index 009d854..f45b2ae 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -412,6 +412,23 @@ ssize_t new_sync_read(struct file *filp, char __user *buf, 
size_t len, loff_t *p
 
 EXPORT_SYMBOL(new_sync_read);
 
+ssize_t __vfs_read(struct file *file, char __user *buf, size_t count,
+                  loff_t *pos)
+{
+       ssize_t ret;
+
+       if (file->f_op->read)
+               ret = file->f_op->read(file, buf, count, pos);
+       else if (file->f_op->aio_read)
+               ret = do_sync_read(file, buf, count, pos);
+       else if (file->f_op->read_iter)
+               ret = new_sync_read(file, buf, count, pos);
+       else
+               ret = -EINVAL;
+
+       return ret;
+}
+
 ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t 
*pos)
 {
        ssize_t ret;
@@ -426,12 +443,7 @@ ssize_t vfs_read(struct file *file, char __user *buf, 
size_t count, loff_t *pos)
        ret = rw_verify_area(READ, file, pos, count);
        if (ret >= 0) {
                count = ret;
-               if (file->f_op->read)
-                       ret = file->f_op->read(file, buf, count, pos);
-               else if (file->f_op->aio_read)
-                       ret = do_sync_read(file, buf, count, pos);
-               else
-                       ret = new_sync_read(file, buf, count, pos);
+               ret = __vfs_read(file, buf, count, pos);
                if (ret > 0) {
                        fsnotify_access(file);
                        add_rchar(current, ret);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index e11d60c..ac3a36e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1527,6 +1527,7 @@ 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 *,
diff --git a/security/integrity/iint.c b/security/integrity/iint.c
index a1f5cd1..e359477 100644
--- a/security/integrity/iint.c
+++ b/security/integrity/iint.c
@@ -184,20 +184,16 @@ int integrity_kernel_read(struct file *file, loff_t 
offset,
 {
        mm_segment_t old_fs;
        char __user *buf = addr;
-       ssize_t ret = -EINVAL;
+       ssize_t ret;
 
        if (!(file->f_mode & FMODE_READ))
                return -EBADF;
 
        old_fs = get_fs();
        set_fs(get_ds());
-       if (file->f_op->read)
-               ret = file->f_op->read(file, buf, count, &offset);
-       else if (file->f_op->aio_read)
-               ret = do_sync_read(file, buf, count, &offset);
-       else if (file->f_op->read_iter)
-               ret = new_sync_read(file, buf, count, &offset);
+       ret = __vfs_read(file, buf, count, &offset);
        set_fs(old_fs);
+
        return ret;
 }
 
-- 
1.9.1

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