From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Dave Chinner <david@fromorbit.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>,
hch@lst.de, darrick.wong@oracle.com, axboe@kernel.dk,
tytso@mit.edu, adilger.kernel@dilger.ca, ming.lei@redhat.com,
jthumshirn@suse.de, minwoo.im.dev@gmail.com,
damien.lemoal@wdc.com, andrea.parri@amarulasolutions.com,
hare@suse.com, tj@kernel.org, hannes@cmpxchg.org,
khlebnikov@yandex-team.ru, ajay.joshi@wdc.com,
bvanassche@acm.org, arnd@arndb.de, houtao1@huawei.com,
asml.silence@gmail.com, linux-block@vger.kernel.org,
linux-ext4@vger.kernel.org
Subject: Re: [PATCH 0/4] block: Add support for REQ_OP_ASSIGN_RANGE
Date: Thu, 2 Apr 2020 20:45:30 -0700 (PDT) [thread overview]
Message-ID: <yq1a73t44h1.fsf@oracle.com> (raw)
In-Reply-To: <20200403025757.GL10737@dread.disaster.area> <(Dave> <Chinner's> <message> <of> <"Fri> <> <3> <Apr> <2020> <13:57:57> <+1100")>
Dave,
> .... because when backed by thinp storage, plumbing user level
> fallocate() straight through from the filesystem introduces a
> trivial, user level storage DOS vector....
>
> i.e. a user can just fallocate a bunch of files and, because the
> filesystem can do that instantly, can also run the back end array
> out of space almost instantly. Storage admins are going to love
> this!
In the standards space, the allocation concept was mainly aimed at
protecting filesystem internals against out-of-space conditions on
devices that dedup identical blocks and where simply zeroing the blocks
therefore is ineffective.
So far we have mainly been talking about fallocate on block devices. How
XFS decides to enforce space allocation policy and potentially leverage
this plumbing is entirely up to you.
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2020-04-03 3:46 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-29 17:47 [PATCH 0/4] block: Add support for REQ_OP_ASSIGN_RANGE Chaitanya Kulkarni
2020-03-29 17:47 ` [PATCH 1/4] block: create payloadless issue bio helper Chaitanya Kulkarni
2020-03-29 17:47 ` [PATCH 2/4] block: Add support for REQ_OP_ASSIGN_RANGE Chaitanya Kulkarni
2020-03-29 17:47 ` [PATCH 3/4] loop: Forward REQ_OP_ASSIGN_RANGE into fallocate(0) Chaitanya Kulkarni
2020-03-29 17:47 ` [PATCH 4/4] ext4: Notify block device about alloc-assigned blk Chaitanya Kulkarni
2020-04-01 6:22 ` [PATCH 0/4] block: Add support for REQ_OP_ASSIGN_RANGE Konstantin Khlebnikov
2020-04-02 2:29 ` Martin K. Petersen
2020-04-02 9:49 ` Konstantin Khlebnikov
2020-04-02 22:41 ` Dave Chinner
2020-04-03 1:34 ` Martin K. Petersen
2020-04-03 2:57 ` Dave Chinner
[not found] ` <(Dave>
[not found] ` <(Chaitanya>
[not found] ` <Kulkarni's>
[not found] ` <message>
[not found] ` <of>
[not found] ` <"Tue>
[not found] ` <12>
[not found] ` <"Mon>
[not found] ` <13>
[not found] ` <"Fri>
[not found] ` <3>
[not found] ` <"Sun>
[not found] ` <29>
[not found] ` <Mar>
[not found] ` <2020>
[not found] ` <10:47:10>
[not found] ` <-0700")>
2020-04-01 2:29 ` Martin K. Petersen
2020-04-01 4:53 ` Chaitanya Kulkarni
2020-05-12 16:01 ` [PATCH v11 00/10] Introduce Zone Append for writing to zoned block devices Martin K. Petersen
2020-05-12 16:04 ` Christoph Hellwig
2020-05-12 16:12 ` Martin K. Petersen
2020-05-12 16:18 ` Johannes Thumshirn
2020-05-12 16:24 ` Martin K. Petersen
[not found] ` <13:57:57>
[not found] ` <+1100")>
2020-04-03 3:45 ` Martin K. Petersen [this message]
2020-04-07 2:27 ` [PATCH 0/4] block: Add support for REQ_OP_ASSIGN_RANGE Dave Chinner
2020-04-08 4:10 ` Martin K. Petersen
2020-04-19 22:36 ` Dave Chinner
2020-04-23 0:40 ` Martin K. Petersen
[not found] ` <20:35:11>
[not found] ` <+0800")>
2020-07-13 16:47 ` [PATCH 2/2] block: improve discard bio alignment in __blkdev_issue_discard() Martin K. Petersen
2020-07-13 17:50 ` Coly Li
-- strict thread matches above, loose matches on Subject: below --
2020-05-12 8:55 [PATCH v11 00/10] Introduce Zone Append for writing to zoned block devices Johannes Thumshirn
2020-05-12 8:55 ` [PATCH v11 01/10] block: provide fallbacks for blk_queue_zone_is_seq and blk_queue_zone_no Johannes Thumshirn
2020-05-12 8:55 ` [PATCH v11 02/10] block: rename __bio_add_pc_page to bio_add_hw_page Johannes Thumshirn
2020-05-12 8:55 ` [PATCH v11 03/10] block: Introduce REQ_OP_ZONE_APPEND Johannes Thumshirn
2020-05-12 8:55 ` [PATCH v11 04/10] block: introduce blk_req_zone_write_trylock Johannes Thumshirn
2020-05-12 8:55 ` [PATCH v11 05/10] block: Modify revalidate zones Johannes Thumshirn
2020-05-12 8:55 ` [PATCH v11 06/10] scsi: sd_zbc: factor out sanity checks for zoned commands Johannes Thumshirn
2020-05-12 8:55 ` [PATCH v11 07/10] scsi: sd_zbc: emulate ZONE_APPEND commands Johannes Thumshirn
2020-05-12 8:55 ` [PATCH v11 08/10] null_blk: Support REQ_OP_ZONE_APPEND Johannes Thumshirn
2020-05-12 8:55 ` [PATCH v11 09/10] block: export bio_release_pages and bio_iov_iter_get_pages Johannes Thumshirn
2020-05-12 8:55 ` [PATCH v11 10/10] zonefs: use REQ_OP_ZONE_APPEND for sync DIO Johannes Thumshirn
2020-05-12 13:17 ` [PATCH v11 00/10] Introduce Zone Append for writing to zoned block devices Christoph Hellwig
[not found] ` <(Christoph>
2020-05-13 2:37 ` Jens Axboe
2020-07-13 12:35 [PATCH 0/2] two generic block layer fixes for 5.9 Coly Li
2020-07-13 12:35 ` [PATCH 1/2] block: change REQ_OP_ZONE_RESET and REQ_OP_ZONE_RESET_ALL to be odd numbers Coly Li
2020-07-13 23:12 ` Damien Le Moal
2020-07-13 12:35 ` [PATCH 2/2] block: improve discard bio alignment in __blkdev_issue_discard() Coly Li
[not found] ` <(Coly>
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