Change Details

In particular, do not assume that vn_start_write() returns the same mp as it was passed in. Also be more accurate to return NULL vp and mp when error occured, to catch wrong control flow easier. Stop checking for NULL mp before calling vn_finished_write(), NULL mp is handled transparently by VFS.

In particular, do not assume that vn_start_write() returns the same mp as it was passed in. Also be more accurate to return NULL vp and mp when error occured, to catch wrong control flow easier. Stop checking for NULL mp before calling vn_finished_write(), NULL mp is handled transparently by VFS.

In particular, do not assume that vn_start_write() returns the same mp as it was passed in. Also be more accurate to return NULL vp and mp when error occured, to catch wrong control flow easier. Stop checking for NULL mp before calling vn_finished_write(), NULL mp is handled transparently by VFS.