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Date: Sat, 21 Dec 2019 13:54:50 -0500 From: "Martin K. Petersen" <martin.petersen@...cle.com> To: Kirill Tkhai <ktkhai@...tuozzo.com> Cc: "Martin K. Petersen" <martin.petersen@...cle.com>, axboe@...nel.dk, linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org, tytso@....edu, adilger.kernel@...ger.ca, ming.lei@...hat.com, osandov@...com, jthumshirn@...e.de, minwoo.im.dev@...il.com, damien.lemoal@....com, andrea.parri@...rulasolutions.com, hare@...e.com, tj@...nel.org, ajay.joshi@....com, sagi@...mberg.me, dsterba@...e.com, chaitanya.kulkarni@....com, bvanassche@....org, dhowells@...hat.com, asml.silence@...il.com Subject: Re: [PATCH RFC 1/3] block: Add support for REQ_OP_ASSIGN_RANGE operation Kirill, > One more thing to discuss. The new REQ_NOZERO flag won't be supported > by many block devices (their number will be even less, than number of > REQ_OP_WRITE_ZEROES supporters). Will this be a good thing, in case of > we will be completing BLKDEV_ZERO_ALLOCATE bios in > __blkdev_issue_write_zeroes() before splitting? I mean introduction of > some flag in struct request_queue::limits. Completion of them with > -EOPNOTSUPP in block devices drivers looks suboptimal for me. We already have the NOFALLBACK flag to let the user make that decision. If that flag is not specified, and I receive an allocate request for a SCSI device that does not support ANCHOR, my expectation would be that I would do a regular write same. If it's a filesystem that is the recipient of the operation and not a SCSI device, how to react would depend on how the filesystem handles unwritten extents, etc. -- Martin K. Petersen Oracle Linux Engineering
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