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H A D | file-posix.c | 73ebf297 Thu May 27 17:20:19 GMT 2021 Thomas Huth <thuth@redhat.com> block/file-posix: Fix problem with fallocate(PUNCH_HOLE) on GPFS
A customer reported that running
qemu-img convert -t none -O qcow2 -f qcow2 input.qcow2 output.qcow2
fails for them with the following error message when the images are stored on a GPFS file system :
qemu-img: error while writing sector 0: Invalid argument
After analyzing the strace output, it seems like the problem is in handle_aiocb_write_zeroes(): The call to fallocate(FALLOC_FL_PUNCH_HOLE) returns EINVAL, which can apparently happen if the file system has a different idea of the granularity of the operation. It's arguably a bug in GPFS, since the PUNCH_HOLE mode should not result in EINVAL according to the man-page of fallocate(), but the file system is out there in production and so we have to deal with it. In commit 294682cc3a ("block: workaround for unaligned byte range in fallocate()") we also already applied the a work-around for the same problem to the earlier fallocate(FALLOC_FL_ZERO_RANGE) call, so do it now similar with the PUNCH_HOLE call. But instead of silently catching and returning -ENOTSUP (which causes the caller to fall back to writing zeroes), let's rather inform the user once about the buggy file system and try the other fallback instead.
Signed-off-by: Thomas Huth <thuth@redhat.com> Message-Id: <20210527172020.847617-2-thuth@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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