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At btrfs_cow_block() we check if the block being COWed belongs to a root that is being deleted and if so we log an error message. However this is an unexpected case and it indicates a bug somewhere, so we should return an error and abort the transaction. So change this in the following ways: 1) Abort the transaction with -EUCLEAN, so that if the issue ever happens it can easily be noticed; 2) Change the logged message level from error to critical, and change the message itself to print the block's logical address and the ID of the root; 3) Return -EUCLEAN to the caller; 4) As this is an unexpected scenario, that should never happen, mark the check as unlikely, allowing the compiler to potentially generate better code. Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.