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[5.186.127.235]) by smtp.gmail.com with ESMTPSA id w15sm6165899ejk.103.2020.06.26.00.26.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Jun 2020 00:26:21 -0700 (PDT) Date: Fri, 26 Jun 2020 09:26:20 +0200 From: Javier =?utf-8?B?R29uesOhbGV6?= To: Damien Le Moal Cc: "linux-nvme@lists.infradead.org" , "linux-block@vger.kernel.org" , "hch@lst.de" , "kbusch@kernel.org" , "sagi@grimberg.me" , "axboe@kernel.dk" , SelvaKumar S , Kanchan Joshi , Nitesh Shetty Subject: Re: [PATCH 3/6] block: add support for zone offline transition Message-ID: <20200626072620.mxve5i3tiq4o4coo@mpHalley.localdomain> References: <20200625122152.17359-1-javier@javigon.com> <20200625122152.17359-4-javier@javigon.com> <20200626060858.uo56xe57l4tzepnc@mpHalley.localdomain> <20200626065822.6psy3tp6vqmjwppa@mpHalley.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 26.06.2020 07:17, Damien Le Moal wrote: >On 2020/06/26 15:58, Javier González wrote: >> On 26.06.2020 06:42, Damien Le Moal wrote: >>> On 2020/06/26 15:09, Javier González wrote: >>>> On 26.06.2020 01:34, Damien Le Moal wrote: >>>>> On 2020/06/25 21:22, Javier González wrote: >>>>>> From: Javier González >>>>>> >>>>>> Add support for offline transition on the zoned block device using the >>>>>> new zone management IOCTL >>>>>> >>>>>> Signed-off-by: Javier González >>>>>> Signed-off-by: SelvaKumar S >>>>>> Signed-off-by: Kanchan Joshi >>>>>> Signed-off-by: Nitesh Shetty >>>>>> --- >>>>>> block/blk-core.c | 2 ++ >>>>>> block/blk-zoned.c | 3 +++ >>>>>> drivers/nvme/host/core.c | 3 +++ >>>>>> include/linux/blk_types.h | 3 +++ >>>>>> include/linux/blkdev.h | 1 - >>>>>> include/uapi/linux/blkzoned.h | 1 + >>>>>> 6 files changed, 12 insertions(+), 1 deletion(-) >>>>>> >>>>>> diff --git a/block/blk-core.c b/block/blk-core.c >>>>>> index 03252af8c82c..589cbdacc5ec 100644 >>>>>> --- a/block/blk-core.c >>>>>> +++ b/block/blk-core.c >>>>>> @@ -140,6 +140,7 @@ static const char *const blk_op_name[] = { >>>>>> REQ_OP_NAME(ZONE_CLOSE), >>>>>> REQ_OP_NAME(ZONE_FINISH), >>>>>> REQ_OP_NAME(ZONE_APPEND), >>>>>> + REQ_OP_NAME(ZONE_OFFLINE), >>>>>> REQ_OP_NAME(WRITE_SAME), >>>>>> REQ_OP_NAME(WRITE_ZEROES), >>>>>> REQ_OP_NAME(SCSI_IN), >>>>>> @@ -1030,6 +1031,7 @@ generic_make_request_checks(struct bio *bio) >>>>>> case REQ_OP_ZONE_OPEN: >>>>>> case REQ_OP_ZONE_CLOSE: >>>>>> case REQ_OP_ZONE_FINISH: >>>>>> + case REQ_OP_ZONE_OFFLINE: >>>>>> if (!blk_queue_is_zoned(q)) >>>>>> goto not_supported; >>>>>> break; >>>>>> diff --git a/block/blk-zoned.c b/block/blk-zoned.c >>>>>> index 29194388a1bb..704fc15813d1 100644 >>>>>> --- a/block/blk-zoned.c >>>>>> +++ b/block/blk-zoned.c >>>>>> @@ -416,6 +416,9 @@ int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode, >>>>>> case BLK_ZONE_MGMT_RESET: >>>>>> op = REQ_OP_ZONE_RESET; >>>>>> break; >>>>>> + case BLK_ZONE_MGMT_OFFLINE: >>>>>> + op = REQ_OP_ZONE_OFFLINE; >>>>>> + break; >>>>>> default: >>>>>> return -ENOTTY; >>>>>> } >>>>>> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c >>>>>> index f1215523792b..5b95c81d2a2d 100644 >>>>>> --- a/drivers/nvme/host/core.c >>>>>> +++ b/drivers/nvme/host/core.c >>>>>> @@ -776,6 +776,9 @@ blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req, >>>>>> case REQ_OP_ZONE_FINISH: >>>>>> ret = nvme_setup_zone_mgmt_send(ns, req, cmd, NVME_ZONE_FINISH); >>>>>> break; >>>>>> + case REQ_OP_ZONE_OFFLINE: >>>>>> + ret = nvme_setup_zone_mgmt_send(ns, req, cmd, NVME_ZONE_OFFLINE); >>>>>> + break; >>>>>> case REQ_OP_WRITE_ZEROES: >>>>>> ret = nvme_setup_write_zeroes(ns, req, cmd); >>>>>> break; >>>>>> diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h >>>>>> index 16b57fb2b99c..b3921263c3dd 100644 >>>>>> --- a/include/linux/blk_types.h >>>>>> +++ b/include/linux/blk_types.h >>>>>> @@ -316,6 +316,8 @@ enum req_opf { >>>>>> REQ_OP_ZONE_FINISH = 12, >>>>>> /* write data at the current zone write pointer */ >>>>>> REQ_OP_ZONE_APPEND = 13, >>>>>> + /* Transition a zone to offline */ >>>>>> + REQ_OP_ZONE_OFFLINE = 14, >>>>>> >>>>>> /* SCSI passthrough using struct scsi_request */ >>>>>> REQ_OP_SCSI_IN = 32, >>>>>> @@ -456,6 +458,7 @@ static inline bool op_is_zone_mgmt(enum req_opf op) >>>>>> case REQ_OP_ZONE_OPEN: >>>>>> case REQ_OP_ZONE_CLOSE: >>>>>> case REQ_OP_ZONE_FINISH: >>>>>> + case REQ_OP_ZONE_OFFLINE: >>>>>> return true; >>>>>> default: >>>>>> return false; >>>>>> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h >>>>>> index bd8521f94dc4..8308d8a3720b 100644 >>>>>> --- a/include/linux/blkdev.h >>>>>> +++ b/include/linux/blkdev.h >>>>>> @@ -372,7 +372,6 @@ extern int blkdev_zone_ops_ioctl(struct block_device *bdev, fmode_t mode, >>>>>> unsigned int cmd, unsigned long arg); >>>>>> extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode, >>>>>> unsigned int cmd, unsigned long arg); >>>>>> - >>>>>> #else /* CONFIG_BLK_DEV_ZONED */ >>>>>> >>>>>> static inline unsigned int blkdev_nr_zones(struct gendisk *disk) >>>>>> diff --git a/include/uapi/linux/blkzoned.h b/include/uapi/linux/blkzoned.h >>>>>> index a8c89fe58f97..d0978ee10fc7 100644 >>>>>> --- a/include/uapi/linux/blkzoned.h >>>>>> +++ b/include/uapi/linux/blkzoned.h >>>>>> @@ -155,6 +155,7 @@ enum blk_zone_action { >>>>>> BLK_ZONE_MGMT_FINISH = 0x2, >>>>>> BLK_ZONE_MGMT_OPEN = 0x3, >>>>>> BLK_ZONE_MGMT_RESET = 0x4, >>>>>> + BLK_ZONE_MGMT_OFFLINE = 0x5, >>>>>> }; >>>>>> >>>>>> /** >>>>>> >>>>> >>>>> As mentioned in previous email, the usefulness of this is dubious. Please >>>>> elaborate in the commit message. Sure NVMe ZNS defines this and we can support >>>>> it. But without a good use case, what is the point ? >>>> >>>> Use case is to transition zones in read-only state to offline when we >>>> are done moving valid data. It is easier to explicitly managing zones >>>> that are not usable by having all under the offline state. >>> >>> Then adding a simple BLKZONEOFFLINE ioctl, similar to open, close, finish and >>> reset, would be enough. No need for all the new zone management ioctl with flags >>> plumbing. >> >> Ok. We can add that then. >> >> Note that zone management is not motivated by this use case at all, but >> it made sense to implement it here instead of as a new BLKZONEOFFLINE >> IOCTL as ZAC/ZBC users will not be able to use it either way. > >Sure, that is fine. We could actually add that to sd_zbc.c since we have zone >tracking there. A read-only zone can be reported as offline to sync-up with zns. >The value of it is dubious though as most applications will treat read-only and >offline zones the same way: as unusable. That is what zonefs does. Ok. > >> >>> >>>> >>>>> >>>>> scsi SD driver will return BLK_STS_NOTSUPP if this offlining is sent to a >>>>> ZBC/ZAC drive. Not nice. Having a sysfs attribute "max_offline_zone_sectors" or >>>>> the like to indicate support by the device or not would be nicer. >>>> >>>> We can do that. >>>> >>>>> >>>>> Does offling ALL zones make any sense ? Because this patch does not prevent the >>>>> use of the REQ_ZONE_ALL flags introduced in patch 2. Probably not a good idea to >>>>> allow offlining all zones, no ? >>>> >>>> AFAIK the transition to offline is only valid when coming from a >>>> read-only state. I did think of adding a check, but I can see that other >>>> transitions go directly to the driver and then the device, so I decided >>>> to follow the same model. If you think it is better, we can add the >>>> check. >>> >>> My point was that the REQ_ZONE_ALL flag would make no sense for offlining zones >>> but this patch does not have anything checking that. There is no point in >>> sending a command that is known to be incorrect to the drive... >> >> I will add some extra checks then to fail early. I assume these should >> be in the NVMe driver as it is NVMe-specific, right? > >If it is a simple BLKZONEOFFLINE ioctl, it can be processed exactly like open, >close and finish, using blkdev_zone_mgmt(). Calling that one for a range of >sectors of more than one zone will likely not make any sense most of the time, >but that is allowed for all other ops, so I guess you can keep it as is for >offline too. blkdev_zone_mgmt() will actually not need any change. You will only >need to wire the ioctl path and update op_is_zone_mgmt(). That's it. Simple that >way. Sounds good. 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[5.186.127.235]) by smtp.gmail.com with ESMTPSA id w15sm6165899ejk.103.2020.06.26.00.26.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Jun 2020 00:26:21 -0700 (PDT) Date: Fri, 26 Jun 2020 09:26:20 +0200 From: Javier =?utf-8?B?R29uesOhbGV6?= To: Damien Le Moal Subject: Re: [PATCH 3/6] block: add support for zone offline transition Message-ID: <20200626072620.mxve5i3tiq4o4coo@mpHalley.localdomain> References: <20200625122152.17359-1-javier@javigon.com> <20200625122152.17359-4-javier@javigon.com> <20200626060858.uo56xe57l4tzepnc@mpHalley.localdomain> <20200626065822.6psy3tp6vqmjwppa@mpHalley.localdomain> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "axboe@kernel.dk" , SelvaKumar S , "sagi@grimberg.me" , Kanchan Joshi , "linux-nvme@lists.infradead.org" , Nitesh Shetty , "linux-block@vger.kernel.org" , "kbusch@kernel.org" , "hch@lst.de" Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org T24gMjYuMDYuMjAyMCAwNzoxNywgRGFtaWVuIExlIE1vYWwgd3JvdGU6Cj5PbiAyMDIwLzA2LzI2 IDE1OjU4LCBKYXZpZXIgR29uesOhbGV6IHdyb3RlOgo+PiBPbiAyNi4wNi4yMDIwIDA2OjQyLCBE YW1pZW4gTGUgTW9hbCB3cm90ZToKPj4+IE9uIDIwMjAvMDYvMjYgMTU6MDksIEphdmllciBHb256 w6FsZXogd3JvdGU6Cj4+Pj4gT24gMjYuMDYuMjAyMCAwMTozNCwgRGFtaWVuIExlIE1vYWwgd3Jv dGU6Cj4+Pj4+IE9uIDIwMjAvMDYvMjUgMjE6MjIsIEphdmllciBHb256w6FsZXogd3JvdGU6Cj4+ Pj4+PiBGcm9tOiBKYXZpZXIgR29uesOhbGV6IDxqYXZpZXIuZ29uekBzYW1zdW5nLmNvbT4KPj4+ Pj4+Cj4+Pj4+PiBBZGQgc3VwcG9ydCBmb3Igb2ZmbGluZSB0cmFuc2l0aW9uIG9uIHRoZSB6b25l ZCBibG9jayBkZXZpY2UgdXNpbmcgdGhlCj4+Pj4+PiBuZXcgem9uZSBtYW5hZ2VtZW50IElPQ1RM Cj4+Pj4+Pgo+Pj4+Pj4gU2lnbmVkLW9mZi1ieTogSmF2aWVyIEdvbnrDoWxleiA8amF2aWVyLmdv 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