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bh=0pvVBxApMQZM2MvhAEFSpgr5BtEmxJ1HLWevFGZ4fwg=; b=WrBpRycSeJPAVUy4FJ9q6g/r2I2xVRvm9hjj/UowLIBa+i2LRISlX7WLPurfnx2Bk6ppHF L3rYugSmuhakTL6nTTtHKTUVvZm/6pRV3Uzi+t91g7THik+cyNB2vuzokbYaD/M9EF2wqE D329HHT38CznXZZ3OJOmIGehtd/5P8M= X-MC-Unique: v06S0n6lOxGghZb1KQY7sg-1 From: Thomas Huth To: qemu-block@nongnu.org, Kevin Wolf , Max Reitz Subject: [PATCH 1/2] block/file-posix: Fix problem with fallocate(PUNCH_HOLE) on GPFS Date: Thu, 27 May 2021 19:20:19 +0200 Message-Id: <20210527172020.847617-2-thuth@redhat.com> In-Reply-To: <20210527172020.847617-1-thuth@redhat.com> References: <20210527172020.847617-1-thuth@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=thuth@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.374, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Andrey Shinkevich , Viktor Mihajlovski , qemu-devel@nongnu.org, Christian Borntraeger Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" 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 --- block/file-posix.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/block/file-posix.c b/block/file-posix.c index 10b71d9a13..134ff01d82 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1650,6 +1650,16 @@ static int handle_aiocb_write_zeroes(void *opaque) return ret; } s->has_fallocate =3D false; + } else if (ret =3D=3D -EINVAL) { + /* + * Some file systems like older versions of GPFS do not like u= n- + * aligned byte ranges, and return EINVAL in such a case, thou= gh + * they should not do it according to the man-page of fallocat= e(). + * Warn about the bad filesystem and try the final fallback in= stead. + */ + warn_report_once("Your file system is misbehaving: " + "fallocate(FALLOC_FL_PUNCH_HOLE) returned EIN= VAL. " + "Please report this bug to your file sytem ve= ndor."); } else if (ret !=3D -ENOTSUP) { return ret; } else { --=20 2.27.0