Re: [PATCH v3 12/22] vfs: define kernel_read_file_from_path

---
 fs/exec.c          | 22 ++++++++++++++++++++++
 include/linux/fs.h |  2 ++
 2 files changed, 24 insertions(+)

diff --git a/fs/exec.c b/fs/exec.c
index cd2b5b2..5629958 100644
--- a/fs/exec.c
+++ b/fs/exec.c

@@ -884,6 +884,28 @@ out:
 }
 EXPORT_SYMBOL_GPL(kernel_read_file);

+int kernel_read_file_from_path(char *path, void **buf, loff_t *size,
+                              loff_t max_size, enum kernel_read_file_id id)
+{
+       struct file *file;
+       int ret;
+
+       if (!path || !*path)
+               return -EINVAL;
+
+       file = filp_open(path, O_RDONLY, 0);
+       if (IS_ERR(file)) {
+               ret = PTR_ERR(file);
+               pr_err("Unable to open file: %s (%d)", path, ret);
+               return ret;
+       }
+
+       ret = kernel_read_file(file, buf, size, max_size, id);
+       fput(file);
+       return ret;
+}
+EXPORT_SYMBOL_GPL(kernel_read_file_from_path);
+
 ssize_t read_code(struct file *file, unsigned long addr, loff_t pos, size_t len)
 {
        ssize_t res = vfs_read(file, (void __user *)addr, len, &pos);

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1458ca5..962c491 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h

@@ -2533,6 +2533,8 @@ enum kernel_read_file_id {
 extern int kernel_read(struct file *, loff_t, char *, unsigned long);
 extern int kernel_read_file(struct file *, void **, loff_t *, loff_t,
                            enum kernel_read_file_id);
+extern int kernel_read_file_from_path(char *, void **, loff_t *, loff_t,
+                                     enum kernel_read_file_id);
 extern ssize_t kernel_write(struct file *, const char *, size_t, loff_t);
 extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *);
 extern struct file * open_exec(const char *);
--

2.1.0