From: Jeff Moyer <jmoyer@redhat.com>
To: Dave Chinner <david@fromorbit.com>
Cc: linux-nvdimm@ml01.01.org,
"J. Bruce Fields" <bfields@fieldses.org>,
linux-mm@kvack.org, Andreas Dilger <adilger.kernel@dilger.ca>,
"H. Peter Anvin" <hpa@zytor.com>,
Jeff Layton <jlayton@poochiereds.net>,
x86@kernel.org, Ingo Molnar <mingo@redhat.com>,
linux-ext4@vger.kernel.org, xfs@oss.sgi.com,
Alexander Viro <viro@zeniv.linux.org.uk>,
Thomas Gleixner <tglx@linutronix.de>,
axboe@kernel.dk, "Theodore Ts'o" <tytso@mit.edu>,
linux-kernel@vger.kernel.org, Jan Kara <jack@suse.com>,
linux-fsdevel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Matthew Wilcox <matthew.r.wilcox@intel.com>
Subject: Re: [RFC 00/11] DAX fsynx/msync support
Date: Wed, 04 Nov 2015 13:34:58 -0500 [thread overview]
Message-ID: <x49a8qtpq99.fsf@segfault.boston.devel.redhat.com> (raw)
In-Reply-To: <x49twp4p11j.fsf@segfault.boston.devel.redhat.com> (Jeff Moyer's message of "Mon, 02 Nov 2015 16:02:48 -0500")
Jeff Moyer <jmoyer@redhat.com> writes:
>> Hence once the filesystem has waited on the REQ_WRITE|REQ_FLUSH IO
>> to complete, we know that all the earlier REQ_WRITE IOs are on
>> stable storage, too. Hence there's no need for the elevator to drain
>> the queue to guarantee completion ordering - the dispatch ordering
>> and flush/fua write semantics guarantee that when the flush/fua
>> completes, all the IOs dispatch prior to that flush/fua write are
>> also on stable storage...
>
> Des xfs rely on this model for correctness? If so, I'd say we've got a
> problem.
Dave?
next prev parent reply other threads:[~2015-11-04 18:35 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-29 20:12 [RFC 00/11] DAX fsynx/msync support Ross Zwisler
2015-10-29 20:12 ` [RFC 01/11] pmem: add wb_cache_pmem() to the PMEM API Ross Zwisler
2015-10-29 20:12 ` [RFC 02/11] mm: add pmd_mkclean() Ross Zwisler
2015-10-29 20:12 ` [RFC 03/11] pmem: enable REQ_FLUSH handling Ross Zwisler
2015-10-29 20:12 ` [RFC 04/11] dax: support dirty DAX entries in radix tree Ross Zwisler
2015-10-29 20:12 ` [RFC 05/11] mm: add follow_pte_pmd() Ross Zwisler
2015-10-29 20:12 ` [RFC 06/11] mm: add pgoff_mkclean() Ross Zwisler
2015-10-29 20:12 ` [RFC 07/11] mm: add find_get_entries_tag() Ross Zwisler
2015-10-29 20:12 ` [RFC 08/11] fs: add get_block() to struct inode_operations Ross Zwisler
2015-10-29 20:12 ` [RFC 09/11] dax: add support for fsync/sync Ross Zwisler
2015-10-29 20:12 ` [RFC 10/11] xfs, ext2: call dax_pfn_mkwrite() on write fault Ross Zwisler
2015-10-29 20:12 ` [RFC 11/11] ext4: add ext4_dax_pfn_mkwrite() Ross Zwisler
2015-10-29 22:49 ` [RFC 00/11] DAX fsynx/msync support Ross Zwisler
2015-10-30 3:55 ` Dave Chinner
2015-10-30 18:39 ` Ross Zwisler
2015-11-01 23:29 ` Dave Chinner
2015-11-02 14:22 ` Jeff Moyer
2015-11-02 20:10 ` Dave Chinner
2015-11-02 21:02 ` Jeff Moyer
2015-11-04 18:34 ` Jeff Moyer [this message]
2015-11-05 8:33 ` Dave Chinner
2015-11-05 19:49 ` Jeff Moyer
2015-11-05 20:54 ` Jens Axboe
2015-10-30 18:34 ` Dan Williams
2015-10-30 19:43 ` Ross Zwisler
2015-10-30 19:51 ` Dan Williams
2015-11-01 23:36 ` Dave Chinner
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