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During truncation we reserve 2 metadata units when starting a transaction (reserved space goes to fs_info->trans_block_rsv) and then attempt to migrate 1 unit (min_size bytes) from fs_info->trans_block_rsv into the local block reserve. If we ever fail we trigger a BUG_ON(), which should never happen, because we reserved 2 units. However if we happen to fail for some reason, we don't need to be so dire and hit a BUG_ON(), we can just error out the truncation and, since this is highly unexpected, surround the error check with WARN_ON(), to get an informative stack trace and tag the branh as 'unlikely'. Also make the 'min_size' variable const, since it's not supposed to ever change and any accidental change could possibly make the space migration not so unlikely to fail. Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Filipe Manana <fdmanana@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.