From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933194AbdJaXbO (ORCPT ); Tue, 31 Oct 2017 19:31:14 -0400 Received: from mga01.intel.com ([192.55.52.88]:7786 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932449AbdJaX2t (ORCPT ); Tue, 31 Oct 2017 19:28:49 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.44,326,1505804400"; d="scan'208";a="144460089" Subject: [PATCH 09/15] tools/testing/nvdimm: add 'bio_delay' mechanism From: Dan Williams To: linux-nvdimm@lists.01.org Cc: linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, akpm@linux-foundation.org, hch@lst.de Date: Tue, 31 Oct 2017 16:22:24 -0700 Message-ID: <150949214412.24061.1436576623974467007.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <150949209290.24061.6283157778959640151.stgit@dwillia2-desk3.amr.corp.intel.com> References: <150949209290.24061.6283157778959640151.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.17.1-9-g687f MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In support of testing truncate colliding with dma add a mechanism that delays the completion of block I/O requests by a programmable number of seconds. This allows a truncate operation to be issued while page references are held for direct-I/O. Signed-off-by: Dan Williams --- tools/testing/nvdimm/Kbuild | 1 + tools/testing/nvdimm/test/iomap.c | 62 +++++++++++++++++++++++++++++++++ tools/testing/nvdimm/test/nfit.c | 34 ++++++++++++++++++ tools/testing/nvdimm/test/nfit_test.h | 1 + 4 files changed, 98 insertions(+) diff --git a/tools/testing/nvdimm/Kbuild b/tools/testing/nvdimm/Kbuild index d870520da68b..5946cf3afe74 100644 --- a/tools/testing/nvdimm/Kbuild +++ b/tools/testing/nvdimm/Kbuild @@ -15,6 +15,7 @@ ldflags-y += --wrap=insert_resource ldflags-y += --wrap=remove_resource ldflags-y += --wrap=acpi_evaluate_object ldflags-y += --wrap=acpi_evaluate_dsm +ldflags-y += --wrap=bio_endio DRIVERS := ../../../drivers NVDIMM_SRC := $(DRIVERS)/nvdimm diff --git a/tools/testing/nvdimm/test/iomap.c b/tools/testing/nvdimm/test/iomap.c index e1f75a1914a1..1f5d7182ca9c 100644 --- a/tools/testing/nvdimm/test/iomap.c +++ b/tools/testing/nvdimm/test/iomap.c @@ -10,6 +10,7 @@ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ +#include #include #include #include @@ -18,6 +19,7 @@ #include #include #include +#include #include #include #include "nfit_test.h" @@ -388,4 +390,64 @@ union acpi_object * __wrap_acpi_evaluate_dsm(acpi_handle handle, const guid_t *g } EXPORT_SYMBOL(__wrap_acpi_evaluate_dsm); +static DEFINE_SPINLOCK(bio_lock); +static struct bio *biolist; +int bio_do_queue; + +static void run_bio(struct work_struct *work) +{ + struct delayed_work *dw = container_of(work, typeof(*dw), work); + struct bio *bio, *next; + + pr_info("%s\n", __func__); + spin_lock(&bio_lock); + bio_do_queue = 0; + bio = biolist; + biolist = NULL; + spin_unlock(&bio_lock); + + while (bio) { + next = bio->bi_next; + bio->bi_next = NULL; + bio_endio(bio); + bio = next; + } + kfree(dw); +} + +void nfit_test_inject_bio_delay(int sec) +{ + struct delayed_work *dw = kzalloc(sizeof(*dw), GFP_KERNEL); + + spin_lock(&bio_lock); + if (!bio_do_queue) { + pr_info("%s: %d seconds\n", __func__, sec); + INIT_DELAYED_WORK(dw, run_bio); + bio_do_queue = 1; + schedule_delayed_work(dw, sec * HZ); + dw = NULL; + } + spin_unlock(&bio_lock); +} +EXPORT_SYMBOL_GPL(nfit_test_inject_bio_delay); + +void __wrap_bio_endio(struct bio *bio) +{ + int did_q = 0; + + spin_lock(&bio_lock); + if (bio_do_queue) { + bio->bi_next = biolist; + biolist = bio; + did_q = 1; + } + spin_unlock(&bio_lock); + + if (did_q) + return; + + bio_endio(bio); +} +EXPORT_SYMBOL_GPL(__wrap_bio_endio); + MODULE_LICENSE("GPL v2"); diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c index bef419d4266d..2c871c8b4a56 100644 --- a/tools/testing/nvdimm/test/nfit.c +++ b/tools/testing/nvdimm/test/nfit.c @@ -656,6 +656,39 @@ static const struct attribute_group *nfit_test_dimm_attribute_groups[] = { NULL, }; +static ssize_t bio_delay_show(struct device_driver *drv, char *buf) +{ + return sprintf(buf, "0\n"); +} + +static ssize_t bio_delay_store(struct device_driver *drv, const char *buf, + size_t count) +{ + unsigned long delay; + int rc = kstrtoul(buf, 0, &delay); + + if (rc < 0) + return rc; + + nfit_test_inject_bio_delay(delay); + return count; +} +DRIVER_ATTR_RW(bio_delay); + +static struct attribute *nfit_test_driver_attributes[] = { + &driver_attr_bio_delay.attr, + NULL, +}; + +static struct attribute_group nfit_test_driver_attribute_group = { + .attrs = nfit_test_driver_attributes, +}; + +static const struct attribute_group *nfit_test_driver_attribute_groups[] = { + &nfit_test_driver_attribute_group, + NULL, +}; + static int nfit_test0_alloc(struct nfit_test *t) { size_t nfit_size = sizeof(struct acpi_nfit_system_address) * NUM_SPA @@ -1905,6 +1938,7 @@ static struct platform_driver nfit_test_driver = { .remove = nfit_test_remove, .driver = { .name = KBUILD_MODNAME, + .groups = nfit_test_driver_attribute_groups, }, .id_table = nfit_test_id, }; diff --git a/tools/testing/nvdimm/test/nfit_test.h b/tools/testing/nvdimm/test/nfit_test.h index d3d63dd5ed38..0d818d2adaf7 100644 --- a/tools/testing/nvdimm/test/nfit_test.h +++ b/tools/testing/nvdimm/test/nfit_test.h @@ -46,4 +46,5 @@ void nfit_test_setup(nfit_test_lookup_fn lookup, nfit_test_evaluate_dsm_fn evaluate); void nfit_test_teardown(void); struct nfit_test_resource *get_nfit_res(resource_size_t resource); +void nfit_test_inject_bio_delay(int sec); #endif