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From 8c339c3535728179acc94deb5b922aebcfac9ab6 Mon Sep 17 00:00:00 2001
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From: Thomas Huth <thuth@redhat.com>
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Date: Thu, 3 Jun 2021 16:13:34 -0400
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Subject: [PATCH 2/4] block/file-posix: Fix problem with fallocate(PUNCH_HOLE)
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on GPFS
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RH-Author: Thomas Huth <thuth@redhat.com>
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Message-id: <20210603161334.607005-2-thuth@redhat.com>
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Patchwork-id: 101673
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O-Subject: [RHEL-8.5.0 qemu-kvm PATCH 1/1] block/file-posix: Fix problem with fallocate(PUNCH_HOLE) on GPFS
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Bugzilla: 1944861
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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A customer reported that running
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qemu-img convert -t none -O qcow2 -f qcow2 input.qcow2 output.qcow2
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fails for them with the following error message when the images are
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stored on a GPFS file system :
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qemu-img: error while writing sector 0: Invalid argument
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After analyzing the strace output, it seems like the problem is in
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handle_aiocb_write_zeroes(): The call to fallocate(FALLOC_FL_PUNCH_HOLE)
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returns EINVAL, which can apparently happen if the file system has
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a different idea of the granularity of the operation. It's arguably
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a bug in GPFS, since the PUNCH_HOLE mode should not result in EINVAL
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according to the man-page of fallocate(), but the file system is out
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there in production and so we have to deal with it. In commit 294682cc3a
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("block: workaround for unaligned byte range in fallocate()") we also
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already applied the a work-around for the same problem to the earlier
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fallocate(FALLOC_FL_ZERO_RANGE) call, so do it now similar with the
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PUNCH_HOLE call. But instead of silently catching and returning
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-ENOTSUP (which causes the caller to fall back to writing zeroes),
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let's rather inform the user once about the buggy file system and
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try the other fallback instead.
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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Message-Id: <20210527172020.847617-2-thuth@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 73ebf29729d1a40feaa9f8ab8951b6ee6dbfbede)
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1944861
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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block/file-posix.c | 11 +++++++++++
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1 file changed, 11 insertions(+)
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diff --git a/block/file-posix.c b/block/file-posix.c
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index 62a463229f..371572f1b0 100644
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--- a/block/file-posix.c
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+++ b/block/file-posix.c
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@@ -1587,6 +1587,17 @@ static int handle_aiocb_write_zeroes(void *opaque)
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return ret;
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}
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s->has_fallocate = false;
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+ } else if (ret == -EINVAL) {
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+ /*
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+ * Some file systems like older versions of GPFS do not like un-
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+ * aligned byte ranges, and return EINVAL in such a case, though
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+ * they should not do it according to the man-page of fallocate().
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+ * Warn about the bad filesystem and try the final fallback instead.
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+ */
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+ warn_report_once("Your file system is misbehaving: "
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+ "fallocate(FALLOC_FL_PUNCH_HOLE) returned EINVAL. "
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+ "Please report this bug to your file sytem "
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+ "vendor.");
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} else if (ret != -ENOTSUP) {
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return ret;
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} else {
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--
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2.27.0
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