qemu-kvm/SOURCES/kvm-block-file-posix-Fix-problem-with-fallocate-PUNCH_HO.patch

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Diff

From 8c339c3535728179acc94deb5b922aebcfac9ab6 Mon Sep 17 00:00:00 2001
From: Thomas Huth <thuth@redhat.com>
Date: Thu, 3 Jun 2021 16:13:34 -0400
Subject: [PATCH 2/4] block/file-posix: Fix problem with fallocate(PUNCH_HOLE)
on GPFS
RH-Author: Thomas Huth <thuth@redhat.com>
Message-id: <20210603161334.607005-2-thuth@redhat.com>
Patchwork-id: 101673
O-Subject: [RHEL-8.5.0 qemu-kvm PATCH 1/1] block/file-posix: Fix problem with fallocate(PUNCH_HOLE) on GPFS
Bugzilla: 1944861
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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>
(cherry picked from commit 73ebf29729d1a40feaa9f8ab8951b6ee6dbfbede)
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1944861
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
block/file-posix.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/block/file-posix.c b/block/file-posix.c
index 62a463229f..371572f1b0 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1587,6 +1587,17 @@ static int handle_aiocb_write_zeroes(void *opaque)
return ret;
}
s->has_fallocate = false;
+ } else if (ret == -EINVAL) {
+ /*
+ * Some file systems like older versions of GPFS do not like un-
+ * aligned byte ranges, and return EINVAL in such a case, though
+ * they should not do it according to the man-page of fallocate().
+ * Warn about the bad filesystem and try the final fallback instead.
+ */
+ warn_report_once("Your file system is misbehaving: "
+ "fallocate(FALLOC_FL_PUNCH_HOLE) returned EINVAL. "
+ "Please report this bug to your file sytem "
+ "vendor.");
} else if (ret != -ENOTSUP) {
return ret;
} else {
--
2.27.0