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Date: Tue, 14 Oct 2014 02:21:28 -0700 From: Christoph Hellwig <hch@...radead.org> To: Dave Chinner <david@...morbit.com> Cc: "Darrick J. Wong" <darrick.wong@...cle.com>, Jens Axboe <axboe@...nel.dk>, "Martin K. Petersen" <martin.petersen@...cle.com>, linux-fsdevel@...r.kernel.org, Theodore Ts'o <tytso@....edu>, linux-ext4 <linux-ext4@...r.kernel.org> Subject: Re: BLKZEROOUT + pread should return zeroes, right? On Tue, Oct 14, 2014 at 03:27:11PM +1100, Dave Chinner wrote: > Broken usage, IMO. If you are going to use the block layer ioctls to > manipulate data int eh block device, you should be using direct Io > for all your data IO to the block device. Otherwise, coherency > problems occur.... I'd say BLKZEROOUT semantics are broken. Having an ioctl exposed that maniulates on-disk data without cache coherence is a nightmare that people trip over easily. Even experienced people like Darrick. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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