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Presently, failing a primary super block write but succeeding in at least one super block write in general will appear to users as if nothing important went wrong. However, upon unmounting and re-mounting, the file system will be in a rolled back state. This was discovered with a BCC program that uses bpf_override_return() to fail super block writes. This patch outputs an error clarifying that the primary super block write has failed, so users can expect potentially erroneous behaviour. It also forces wait_dev_supers() to return an error to its caller if the primary super block write fails. Signed-off-by: Howard McLauchlan <hmclauchlan@fb.com> Reviewed-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.