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Mon, 01 Feb 2021 22:35:32 -0500 X-MC-Unique: Q1OvdKGqMk2AnNt7Hz-4Yw-1 X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R191e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=e01e04420; MF=jefflexu@linux.alibaba.com; NM=1; PH=DS; RN=6; SR=0; TI=SMTPD_---0UNeAz4g_1612236928 Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0UNeAz4g_1612236928) by smtp.aliyun-inc.com(127.0.0.1); Tue, 02 Feb 2021 11:35:28 +0800 From: Jeffle Xu To: snitzer@redhat.com Date: Tue, 2 Feb 2021 11:35:28 +0800 Message-Id: <20210202033528.76166-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-loop: dm-devel@redhat.com X-Mailman-Approved-At: Tue, 02 Feb 2021 04:24:46 -0500 Cc: joseph.qi@linux.alibaba.com, msb@chromium.org, dm-devel@redhat.com, toshi.kani@hpe.com, mbroz@redhat.com Subject: [dm-devel] [PATCH] dm: fix iterate_device sanity check X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com According to the definition of dm_iterate_devices_fn: * This function must iterate through each section of device used by the * target until it encounters a non-zero return code, which it then returns. * Returns zero if no callout returned non-zero. For some target type (e.g., dm-stripe), one call of iterate_devices() may iterate multiple underlying devices internally, in which case a non-zero return code returned by iterate_devices_callout_fn will stop the iteration in advance. Thus if we want to ensure that _all_ underlying devices support some kind of attribute, the iteration structure like dm_table_supports_nowait() should be used, while the input iterate_devices_callout_fn should handle the 'not support' semantics. On the opposite, the iteration structure like dm_table_any_device_attribute() should be used if _any_ underlying device supporting this attibute is sufficient. In this case, the input iterate_devices_callout_fn should handle the 'support' semantics. Fixes: 545ed20e6df6 ("dm: add infrastructure for DAX support") Fixes: c3c4555edd10 ("dm table: clear add_random unless all devices have it set") Fixes: 4693c9668fdc ("dm table: propagate non rotational flag") Cc: stable@vger.kernel.org Signed-off-by: Jeffle Xu --- drivers/md/dm-table.c | 84 ++++++++++++++++++++++--------------------- drivers/md/dm.c | 2 +- drivers/md/dm.h | 2 +- 3 files changed, 46 insertions(+), 42 deletions(-) diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 4acf2342f7ad..53dcbf75eda9 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -820,24 +820,24 @@ void dm_table_set_type(struct dm_table *t, enum dm_queue_mode type) EXPORT_SYMBOL_GPL(dm_table_set_type); /* validate the dax capability of the target device span */ -int device_supports_dax(struct dm_target *ti, struct dm_dev *dev, +int device_not_dax_capable(struct dm_target *ti, struct dm_dev *dev, sector_t start, sector_t len, void *data) { int blocksize = *(int *) data, id; bool rc; id = dax_read_lock(); - rc = dax_supported(dev->dax_dev, dev->bdev, blocksize, start, len); + rc = !dax_supported(dev->dax_dev, dev->bdev, blocksize, start, len); dax_read_unlock(id); return rc; } /* Check devices support synchronous DAX */ -static int device_dax_synchronous(struct dm_target *ti, struct dm_dev *dev, +static int device_not_dax_synchronous_capable(struct dm_target *ti, struct dm_dev *dev, sector_t start, sector_t len, void *data) { - return dev->dax_dev && dax_synchronous(dev->dax_dev); + return !dev->dax_dev || !dax_synchronous(dev->dax_dev); } bool dm_table_supports_dax(struct dm_table *t, @@ -854,7 +854,7 @@ bool dm_table_supports_dax(struct dm_table *t, return false; if (!ti->type->iterate_devices || - !ti->type->iterate_devices(ti, iterate_fn, blocksize)) + ti->type->iterate_devices(ti, iterate_fn, blocksize)) return false; } @@ -925,7 +925,7 @@ static int dm_table_determine_type(struct dm_table *t) verify_bio_based: /* We must use this table as bio-based */ t->type = DM_TYPE_BIO_BASED; - if (dm_table_supports_dax(t, device_supports_dax, &page_size) || + if (dm_table_supports_dax(t, device_not_dax_capable, &page_size) || (list_empty(devices) && live_md_type == DM_TYPE_DAX_BIO_BASED)) { t->type = DM_TYPE_DAX_BIO_BASED; } @@ -1595,12 +1595,12 @@ static int dm_table_supports_dax_write_cache(struct dm_table *t) return false; } -static int device_is_nonrot(struct dm_target *ti, struct dm_dev *dev, +static int device_is_rot(struct dm_target *ti, struct dm_dev *dev, sector_t start, sector_t len, void *data) { struct request_queue *q = bdev_get_queue(dev->bdev); - return q && blk_queue_nonrot(q); + return q && !blk_queue_nonrot(q); } static int device_is_not_random(struct dm_target *ti, struct dm_dev *dev, @@ -1611,8 +1611,8 @@ static int device_is_not_random(struct dm_target *ti, struct dm_dev *dev, return q && !blk_queue_add_random(q); } -static bool dm_table_all_devices_attribute(struct dm_table *t, - iterate_devices_callout_fn func) +static bool dm_table_any_device_attribute(struct dm_table *t, + iterate_devices_callout_fn func) { struct dm_target *ti; unsigned i; @@ -1620,12 +1620,12 @@ static bool dm_table_all_devices_attribute(struct dm_table *t, for (i = 0; i < dm_table_get_num_targets(t); i++) { ti = dm_table_get_target(t, i); - if (!ti->type->iterate_devices || - !ti->type->iterate_devices(ti, func, NULL)) - return false; + if (ti->type->iterate_devices && + ti->type->iterate_devices(ti, func, NULL)) + return true; } - return true; + return false; } static int device_not_write_same_capable(struct dm_target *ti, struct dm_dev *dev, @@ -1780,26 +1780,25 @@ static int device_requires_stable_pages(struct dm_target *ti, } /* - * If any underlying device requires stable pages, a table must require - * them as well. Only targets that support iterate_devices are considered: - * don't want error, zero, etc to require stable pages. + * type->iterate_devices() should be called when the sanity check needs to + * iterate and check all underlying data devices. iterate_devices() will + * iterate all underlying data devices until it encounters a non-zero return + * code, returned by whether the input iterate_devices_callout_fn, or + * iterate_devices() itself internally. + * + * For some target type (e.g., dm-stripe), one call of iterate_devices() may + * iterate multiple underlying devices internally, in which case a non-zero + * return code returned by iterate_devices_callout_fn will stop the iteration + * in advance. + * + * Thus if we want to ensure that _all_ underlying devices support some kind of + * attribute, the iteration structure like dm_table_supports_nowait() should be + * used, while the input iterate_devices_callout_fn should handle the 'not + * support' semantics. On the opposite, the iteration structure like + * dm_table_any_device_attribute() should be used if _any_ underlying device + * supporting this attibute is sufficient. In this case, the input + * iterate_devices_callout_fn should handle the 'support' semantics. */ -static bool dm_table_requires_stable_pages(struct dm_table *t) -{ - struct dm_target *ti; - unsigned i; - - for (i = 0; i < dm_table_get_num_targets(t); i++) { - ti = dm_table_get_target(t, i); - - if (ti->type->iterate_devices && - ti->type->iterate_devices(ti, device_requires_stable_pages, NULL)) - return true; - } - - return false; -} - void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, struct queue_limits *limits) { @@ -1837,9 +1836,9 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, } blk_queue_write_cache(q, wc, fua); - if (dm_table_supports_dax(t, device_supports_dax, &page_size)) { + if (dm_table_supports_dax(t, device_not_dax_capable, &page_size)) { blk_queue_flag_set(QUEUE_FLAG_DAX, q); - if (dm_table_supports_dax(t, device_dax_synchronous, NULL)) + if (dm_table_supports_dax(t, device_not_dax_synchronous_capable, NULL)) set_dax_synchronous(t->md->dax_dev); } else @@ -1849,10 +1848,10 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, dax_write_cache(t->md->dax_dev, true); /* Ensure that all underlying devices are non-rotational. */ - if (dm_table_all_devices_attribute(t, device_is_nonrot)) - blk_queue_flag_set(QUEUE_FLAG_NONROT, q); - else + if (dm_table_any_device_attribute(t, device_is_rot)) blk_queue_flag_clear(QUEUE_FLAG_NONROT, q); + else + blk_queue_flag_set(QUEUE_FLAG_NONROT, q); if (!dm_table_supports_write_same(t)) q->limits.max_write_same_sectors = 0; @@ -1864,8 +1863,11 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, /* * Some devices don't use blk_integrity but still want stable pages * because they do their own checksumming. + * If any underlying device requires stable pages, a table must require + * them as well. Only targets that support iterate_devices are considered: + * don't want error, zero, etc to require stable pages. */ - if (dm_table_requires_stable_pages(t)) + if (dm_table_any_device_attribute(t, device_requires_stable_pages)) blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, q); else blk_queue_flag_clear(QUEUE_FLAG_STABLE_WRITES, q); @@ -1876,8 +1878,10 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, * Clear QUEUE_FLAG_ADD_RANDOM if any underlying device does not * have it set. */ - if (blk_queue_add_random(q) && dm_table_all_devices_attribute(t, device_is_not_random)) + if (dm_table_any_device_attribute(t, device_is_not_random)) blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q); + else + blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q); /* * For a zoned target, the number of zones should be updated for the diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 7bac564f3faa..8a3d73efb9dd 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1128,7 +1128,7 @@ static bool dm_dax_supported(struct dax_device *dax_dev, struct block_device *bd if (!map) goto out; - ret = dm_table_supports_dax(map, device_supports_dax, &blocksize); + ret = dm_table_supports_dax(map, device_not_dax_capable, &blocksize); out: dm_put_live_table(md, srcu_idx); diff --git a/drivers/md/dm.h b/drivers/md/dm.h index fffe1e289c53..b441ad772c18 100644 --- a/drivers/md/dm.h +++ b/drivers/md/dm.h @@ -73,7 +73,7 @@ void dm_table_free_md_mempools(struct dm_table *t); struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t); bool dm_table_supports_dax(struct dm_table *t, iterate_devices_callout_fn fn, int *blocksize); -int device_supports_dax(struct dm_target *ti, struct dm_dev *dev, +int device_not_dax_capable(struct dm_target *ti, struct dm_dev *dev, sector_t start, sector_t len, void *data); void dm_lock_md_type(struct mapped_device *md);