From: Pankaj Raghav <p.raghav@samsung.com> To: Bart Van Assche <bvanassche@acm.org>, <hch@lst.de>, <snitzer@redhat.com>, <damien.lemoal@opensource.wdc.com>, <axboe@kernel.dk> Cc: <pankydev8@gmail.com>, <gost.dev@samsung.com>, <jiangbo.365@bytedance.com>, <linux-nvme@lists.infradead.org>, <linux-kernel@vger.kernel.org>, <linux-block@vger.kernel.org>, <dm-devel@redhat.com>, <jonathan.derrick@linux.dev>, <Johannes.Thumshirn@wdc.com>, <dsterba@suse.com>, <jaegeuk@kernel.org>, "Luis Chamberlain" <mcgrof@kernel.org> Subject: Re: [dm-devel] [PATCH v7 02/13] block: allow blk-zoned devices to have non-power-of-2 zone size Date: Thu, 16 Jun 2022 12:09:35 +0200 [thread overview] Message-ID: <e04db101-5628-2a1d-6b5c-997090484d7d@samsung.com> (raw) In-Reply-To: <857c444a-02b9-9cef-0c5b-2ecdb2fd46f6@acm.org> On 2022-06-15 22:28, Bart Van Assche wrote: isk_name, zone->len); >> + if (zone->len == 0) { >> + pr_warn("%s: Invalid zone size", disk->disk_name); >> + return -ENODEV; >> + } >> + >> + /* >> + * Don't allow zoned device with non power_of_2 zone size with >> + * zone capacity less than zone size. >> + */ > > Please change "power_of_2" into "power-of-2". > Ok. >> + if (!is_power_of_2(zone->len) && zone->capacity < zone->len) { >> + pr_warn("%s: Invalid zone capacity for non power of 2 >> zone size", >> + disk->disk_name); >> return -ENODEV; >> } > > The above check seems wrong to me. I don't see why devices that report a > capacity that is less than the zone size should be rejected. > This was brought up by Damien during previous reviews. The argument was that the reason to allow non power-of-2 zoned device is to remove the gaps between zone size and zone capacity. Allowing a npo2 zone size with a different capacity, even though it is technically possible, it does not make any practical sense. That is why this check was introduced. Does that answer your question? >> + /* >> + * Division is used to calculate nr_zones for both power_of_2 >> + * and non power_of_2 zone sizes as it is not in the hot path. >> + */ > > Shouldn't the above comment be moved to the patch description? I'm not > sure whether having such a comment in the source code is valuable. > Yeah, I will remove it. Maybe it is very obvious at this point. >> +static inline sector_t blk_queue_offset_from_zone_start(struct >> request_queue *q, >> + sector_t sec) >> +{ >> + sector_t zone_sectors = blk_queue_zone_sectors(q); >> + u64 remainder = 0; >> + >> + if (!blk_queue_is_zoned(q)) >> + return false; > > "return false" should only occur in functions returning a boolean. This > function returns type sector_t. > Good catch. It was a copy paste mistake. Fixed it. > Thanks, > > Bart.
WARNING: multiple messages have this Message-ID (diff)
From: Pankaj Raghav <p.raghav@samsung.com> To: Bart Van Assche <bvanassche@acm.org>, <hch@lst.de>, <snitzer@redhat.com>, <damien.lemoal@opensource.wdc.com>, <axboe@kernel.dk> Cc: pankydev8@gmail.com, gost.dev@samsung.com, jiangbo.365@bytedance.com, linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, dm-devel@redhat.com, Luis Chamberlain <mcgrof@kernel.org>, jonathan.derrick@linux.dev, Johannes.Thumshirn@wdc.com, dsterba@suse.com, jaegeuk@kernel.org Subject: Re: [dm-devel] [PATCH v7 02/13] block: allow blk-zoned devices to have non-power-of-2 zone size Date: Thu, 16 Jun 2022 12:09:35 +0200 [thread overview] Message-ID: <e04db101-5628-2a1d-6b5c-997090484d7d@samsung.com> (raw) In-Reply-To: <857c444a-02b9-9cef-0c5b-2ecdb2fd46f6@acm.org> On 2022-06-15 22:28, Bart Van Assche wrote: isk_name, zone->len); >> + if (zone->len == 0) { >> + pr_warn("%s: Invalid zone size", disk->disk_name); >> + return -ENODEV; >> + } >> + >> + /* >> + * Don't allow zoned device with non power_of_2 zone size with >> + * zone capacity less than zone size. >> + */ > > Please change "power_of_2" into "power-of-2". > Ok. >> + if (!is_power_of_2(zone->len) && zone->capacity < zone->len) { >> + pr_warn("%s: Invalid zone capacity for non power of 2 >> zone size", >> + disk->disk_name); >> return -ENODEV; >> } > > The above check seems wrong to me. I don't see why devices that report a > capacity that is less than the zone size should be rejected. > This was brought up by Damien during previous reviews. The argument was that the reason to allow non power-of-2 zoned device is to remove the gaps between zone size and zone capacity. Allowing a npo2 zone size with a different capacity, even though it is technically possible, it does not make any practical sense. That is why this check was introduced. Does that answer your question? >> + /* >> + * Division is used to calculate nr_zones for both power_of_2 >> + * and non power_of_2 zone sizes as it is not in the hot path. >> + */ > > Shouldn't the above comment be moved to the patch description? I'm not > sure whether having such a comment in the source code is valuable. > Yeah, I will remove it. Maybe it is very obvious at this point. >> +static inline sector_t blk_queue_offset_from_zone_start(struct >> request_queue *q, >> + sector_t sec) >> +{ >> + sector_t zone_sectors = blk_queue_zone_sectors(q); >> + u64 remainder = 0; >> + >> + if (!blk_queue_is_zoned(q)) >> + return false; > > "return false" should only occur in functions returning a boolean. This > function returns type sector_t. > Good catch. It was a copy paste mistake. Fixed it. > Thanks, > > Bart. -- dm-devel mailing list dm-devel@redhat.com https://listman.redhat.com/mailman/listinfo/dm-devel
next prev parent reply other threads:[~2022-06-16 10:09 UTC|newest] Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <CGME20220615101924eucas1p27fbce623c0e1b3097169bf23dd6266d8@eucas1p2.samsung.com> 2022-06-15 10:19 ` [PATCH v7 00/13] support non power of 2 zoned device Pankaj Raghav 2022-06-15 10:19 ` [dm-devel] " Pankaj Raghav [not found] ` <CGME20220615101927eucas1p17220c7a36f69f59ff8ddd560b42967ec@eucas1p1.samsung.com> 2022-06-15 10:19 ` [PATCH v7 01/13] block: make blkdev_nr_zones and blk_queue_zone_no generic for npo2 zsze Pankaj Raghav 2022-06-15 10:19 ` [dm-devel] " Pankaj Raghav 2022-06-15 20:18 ` Bart Van Assche 2022-06-15 20:18 ` Bart Van Assche [not found] ` <CGME20220615101931eucas1p15ed09ae433a2c378b599e9086130d8eb@eucas1p1.samsung.com> 2022-06-15 10:19 ` [PATCH v7 02/13] block: allow blk-zoned devices to have non-power-of-2 zone size Pankaj Raghav 2022-06-15 10:19 ` [dm-devel] " Pankaj Raghav 2022-06-15 20:28 ` Bart Van Assche 2022-06-15 20:28 ` Bart Van Assche 2022-06-16 10:09 ` Pankaj Raghav [this message] 2022-06-16 10:09 ` Pankaj Raghav 2022-06-16 16:04 ` Luis Chamberlain 2022-06-16 16:04 ` Luis Chamberlain 2022-06-16 23:30 ` Damien Le Moal 2022-06-16 23:30 ` Damien Le Moal [not found] ` <CGME20220615101935eucas1p26a7bc245d88a89312158d7a265f64aef@eucas1p2.samsung.com> 2022-06-15 10:19 ` [PATCH v7 03/13] nvme: zns: Allow ZNS drives that have non-power_of_2 " Pankaj Raghav 2022-06-15 10:19 ` [dm-devel] " Pankaj Raghav [not found] ` <CGME20220615101938eucas1p26ab159a1ffd0fa5a16d7f202ba7206e7@eucas1p2.samsung.com> 2022-06-15 10:19 ` [PATCH v7 04/13] nvmet: Allow ZNS target to support non-power_of_2 zone sizes Pankaj Raghav 2022-06-15 10:19 ` [dm-devel] " Pankaj Raghav [not found] ` <CGME20220615101941eucas1p25e1c27b363e6b288b848521298e31705@eucas1p2.samsung.com> 2022-06-15 10:19 ` [PATCH v7 05/13] null_blk: allow non power of 2 zoned devices Pankaj Raghav 2022-06-15 10:19 ` [dm-devel] " Pankaj Raghav [not found] ` <CGME20220615101945eucas1p16fa264e81d9b6027ff131dd311ed91e2@eucas1p1.samsung.com> 2022-06-15 10:19 ` [PATCH v7 06/13] null_blk: use zone_size_sects_shift for " Pankaj Raghav 2022-06-15 10:19 ` [dm-devel] " Pankaj Raghav 2022-06-15 11:56 ` Damien Le Moal 2022-06-15 11:56 ` [dm-devel] " Damien Le Moal [not found] ` <CGME20220615101948eucas1p2d8d801735c39b25256a019134adb0c6f@eucas1p2.samsung.com> 2022-06-15 10:19 ` [PATCH v7 07/13] zonefs: allow non " Pankaj Raghav 2022-06-15 10:19 ` [dm-devel] " Pankaj Raghav [not found] ` <CGME20220615101951eucas1p238eb45e563bd9645af81bf16c56d98ec@eucas1p2.samsung.com> 2022-06-15 10:19 ` [PATCH v7 08/13] dm-zoned: ensure only power of 2 zone sizes are allowed Pankaj Raghav 2022-06-15 10:19 ` [dm-devel] " Pankaj Raghav [not found] ` <CGME20220615101955eucas1p19b9d42ead7331f69f7dad1ec100312c2@eucas1p1.samsung.com> 2022-06-15 10:19 ` [dm-devel] [PATCH v7 09/13] dm-zone: use generic helpers to calculate offset from zone start Pankaj Raghav 2022-06-15 10:19 ` Pankaj Raghav [not found] ` <CGME20220615102000eucas1p27720aaa3c309327b2b9a33c5f840f498@eucas1p2.samsung.com> 2022-06-15 10:19 ` [dm-devel] [PATCH v7 10/13] dm-table: use bdev_is_zone_start helper in device_area_is_invalid() Pankaj Raghav 2022-06-15 10:19 ` Pankaj Raghav 2022-06-15 11:53 ` Damien Le Moal 2022-06-15 11:53 ` [dm-devel] " Damien Le Moal 2022-06-16 9:55 ` Pankaj Raghav 2022-06-16 9:55 ` [dm-devel] " Pankaj Raghav 2022-06-16 23:29 ` Damien Le Moal 2022-06-16 23:29 ` [dm-devel] " Damien Le Moal [not found] ` <CGME20220615102004eucas1p1e458ea097d381058b16fc6daa3eec998@eucas1p1.samsung.com> 2022-06-15 10:19 ` [dm-devel] [PATCH v7 11/13] dm-table: allow non po2 zoned devices Pankaj Raghav 2022-06-15 10:19 ` Pankaj Raghav [not found] ` <CGME20220615102007eucas1p1106f9520e2a86beb3792107dffd8071b@eucas1p1.samsung.com> 2022-06-15 10:19 ` [dm-devel] [PATCH v7 12/13] dm: call dm_zone_endio after the target endio callback for " Pankaj Raghav 2022-06-15 10:19 ` Pankaj Raghav 2022-06-15 11:01 ` [dm-devel] " Damien Le Moal 2022-06-15 11:01 ` Damien Le Moal 2022-06-16 12:24 ` Pankaj Raghav 2022-06-16 12:24 ` Pankaj Raghav 2022-06-16 23:33 ` Damien Le Moal 2022-06-16 23:33 ` Damien Le Moal [not found] ` <CGME20220615102011eucas1p220368db4a186181b1927dea50a79e5d4@eucas1p2.samsung.com> 2022-06-15 10:19 ` [PATCH v7 13/13] dm: add non power of 2 zoned target Pankaj Raghav 2022-06-15 10:19 ` [dm-devel] " Pankaj Raghav 2022-06-15 11:49 ` Damien Le Moal 2022-06-15 11:49 ` [dm-devel] " Damien Le Moal 2022-06-16 16:12 ` Pankaj Raghav 2022-06-16 16:12 ` [dm-devel] " Pankaj Raghav 2022-06-16 23:49 ` Damien Le Moal 2022-06-16 23:49 ` [dm-devel] " Damien Le Moal 2022-06-17 5:45 ` Pankaj Raghav 2022-06-17 5:45 ` [dm-devel] " Pankaj Raghav 2022-06-17 6:12 ` Damien Le Moal 2022-06-17 6:12 ` [dm-devel] " Damien Le Moal 2022-06-17 6:40 ` Pankaj Raghav 2022-06-17 6:40 ` [dm-devel] " Pankaj Raghav 2022-06-17 6:56 ` Damien Le Moal 2022-06-17 6:56 ` [dm-devel] " Damien Le Moal 2022-06-17 8:03 ` Pankaj Raghav 2022-06-17 8:03 ` [dm-devel] " Pankaj Raghav 2022-06-15 14:19 ` kernel test robot 2022-06-15 14:19 ` [dm-devel] " kernel test robot 2022-06-15 19:54 ` Randy Dunlap 2022-06-15 19:54 ` [dm-devel] " Randy Dunlap 2022-06-16 10:28 ` Pankaj Raghav 2022-06-16 10:28 ` [dm-devel] " Pankaj Raghav
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=e04db101-5628-2a1d-6b5c-997090484d7d@samsung.com \ --to=p.raghav@samsung.com \ --cc=Johannes.Thumshirn@wdc.com \ --cc=axboe@kernel.dk \ --cc=bvanassche@acm.org \ --cc=damien.lemoal@opensource.wdc.com \ --cc=dm-devel@redhat.com \ --cc=dsterba@suse.com \ --cc=gost.dev@samsung.com \ --cc=hch@lst.de \ --cc=jaegeuk@kernel.org \ --cc=jiangbo.365@bytedance.com \ --cc=jonathan.derrick@linux.dev \ --cc=linux-block@vger.kernel.org \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-nvme@lists.infradead.org \ --cc=mcgrof@kernel.org \ --cc=pankydev8@gmail.com \ --cc=snitzer@redhat.com \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.