d43aaf1685
When retrying a failed inode or dquot buffer, xfs_buf_resubmit_failed_buffers() clears all the failed flags from the inde/dquot log items. In doing so, it also drops all the reference counts on the buffer that the failed log items hold. This means it can drop all the active references on the buffer and hence free the buffer before it queues it for write again. Putting the buffer on the delwri queue takes a reference to the buffer (so that it hangs around until it has been written and completed), but this goes bang if the buffer has already been freed. Hence we need to add the buffer to the delwri queue before we remove the failed flags from the log items attached to the buffer to ensure it always remains referenced during the resubmit process. Reported-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.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.