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0f9342513c
The new online shrink code exposed a gap in the per-AG reservation code, which is that we only return ENOSPC to callers if the entire fs doesn't have enough free blocks. Except for debugging mode, the reservation init code doesn't ever check that there's enough free space in that AG to cover the reservation. Not having enough space is not considered an immediate fatal error that requires filesystem offlining because (a) it's shouldn't be possible to wind up in that state through normal file operations and (b) even if one did, freeing data blocks would recover the situation. However, online shrink now needs to know if shrinking would not leave enough space so that it can abort the shrink operation. Hence we need to promote this assertion into an actual error return. Observed by running xfs/168 with a 1k block size, though in theory this could happen with any configuration. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com> Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.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.