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Before this patch, function do_xmote just assumed all the writes submitted to the journal were finished and successful, and it called the go_unlock function to release the dlm lock. But if they're not, and a revoke failed to make its way to the journal, a journal replay on another node will cause corruption if we let the go_inval function continue and tell dlm to release the glock to another node. This patch adds a couple checks for errors in do_xmote after the calls to go_sync and go_inval. If an error is found, we cannot withdraw yet, because the withdraw itself uses glocks to make the file system read-only. Instead, we flag the error. Later, asserts should cause another node to replay the journal before continuing, thus protecting rgrp and dinode glocks and maintaining the integrity of the metadata. Note that we only need to do this for journaled glocks. System glocks should be able to progress even under withdrawn conditions. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Reviewed-by: Andreas Gruenbacher <agruenba@redhat.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
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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.