Revert changes in to a file in kernel module

Question

I am using vfs_write(...) to write a file in kernel module. If an error occurs while writing file I want the changes to get reverted and file should be restored to its original state. Currently I am thinking of maintaining a temp file which contains data of file to be written and in case of faliure replace the temp file with original file but its too much work in kernel module.

I am stuck here anyone know any work around this ?

Answer 1

It might be too much work, but it sounds like the right solution.

Alternatively, handle the getting data from the kernel userspace (eg read it from a file in /proc/ or similar), and make this atomically replace the file concerned.