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From: David Sterba <dsterba@suse.cz>
To: Goldwyn Rodrigues <rgoldwyn@suse.de>
Cc: linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	Goldwyn Rodrigues <rgoldwyn@suse.com>
Subject: Re: [PATCH 01/15] btrfs: create a mount option for dax
Date: Thu, 28 Mar 2019 18:28:25 +0100	[thread overview]
Message-ID: <20190328172825.GQ29086@twin.jikos.cz> (raw)
In-Reply-To: <20190326190301.32365-2-rgoldwyn@suse.de>

On Tue, Mar 26, 2019 at 02:02:47PM -0500, Goldwyn Rodrigues wrote:
> From: Goldwyn Rodrigues <rgoldwyn@suse.com>
> 
> This sets S_DAX in inode->i_flags, which can be used with
> IS_DAX().
> 
> The dax option is restricted to non multi-device mounts.
> dax interacts with the device directly instead of using bio, so
> all bio-hooks which we use for multi-device cannot be performed
> here. While regular read/writes could be manipulated with
> RAID0/1, mmap() is still an issue.

I'm looking for other features that would not work with dax. Disabling
multiple devices strikes out device add, device delete and device
replace.

To be verified:

- balance - at least profile changes must be forbidden

- defrag

- compression - as it needs COW, it won't work on the nodatacow files,
  thus seems to be ok

- resize/grow - this could work without changes, no block relocation is
  needed, only new structures created

- resize/shrink - depends on balance, the block groups from the removed
  area need to be relocated

- swapfiles - I'm sure somebody will try that; I haven't seen any
  IS_DAX checks in the swapfile activation code


  parent reply	other threads:[~2019-03-28 17:27 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190326190301.32365-1-rgoldwyn@suse.de>
2019-03-26 19:02 ` [PATCH 01/15] btrfs: create a mount option for dax Goldwyn Rodrigues
2019-03-26 19:10   ` Matthew Wilcox
2019-03-27 11:00     ` Goldwyn Rodrigues
2019-03-27 12:00       ` Matthew Wilcox
2019-03-27 12:26         ` Goldwyn Rodrigues
2019-03-27 23:31         ` Goldwyn Rodrigues
2019-03-27 17:38     ` Adam Borowski
2019-03-28 14:49   ` David Sterba
2019-03-28 17:28   ` David Sterba [this message]
2019-03-28 17:57     ` Darrick J. Wong
2019-04-01 20:43     ` Goldwyn Rodrigues
2019-03-26 19:02 ` [PATCH 02/15] btrfs: Carve out btrfs_get_extent_map_write() out of btrfs_get_blocks_write() Goldwyn Rodrigues
2019-03-26 19:02 ` [PATCH 03/15] btrfs: basic dax read Goldwyn Rodrigues
2019-03-26 19:02 ` [PATCH 04/15] dax: Introduce IOMAP_F_COW for copy-on-write Goldwyn Rodrigues
2019-03-27 17:54   ` Darrick J. Wong
2019-03-27 18:58     ` Goldwyn Rodrigues
2019-03-28 14:45       ` Darrick J. Wong
2019-04-01  4:38   ` Dave Chinner
2019-04-01 21:41     ` Goldwyn Rodrigues
2019-04-01 23:06       ` Dave Chinner
2019-04-03  1:56         ` Goldwyn Rodrigues
2019-04-03  3:20           ` Dave Chinner
2019-04-07  7:26     ` Christoph Hellwig
2019-03-26 19:02 ` [PATCH 05/15] btrfs: return whether extent is nocow or not Goldwyn Rodrigues
2019-03-31 18:42   ` Nikolay Borisov
2019-03-26 19:02 ` [PATCH 06/15] btrfs: Rename __endio_write_update_ordered() to btrfs_update_ordered_extent() Goldwyn Rodrigues
2019-03-26 19:02 ` [PATCH 07/15] btrfs: add dax write support Goldwyn Rodrigues
2019-03-28 14:53   ` Darrick J. Wong
2019-04-01 20:39     ` Goldwyn Rodrigues
2019-03-26 19:02 ` [PATCH 08/15] dax: add dax_iomap_cow to copy a mmap page before writing Goldwyn Rodrigues
2019-03-28 15:41   ` Darrick J. Wong
2019-03-26 19:02 ` [PATCH 09/15] btrfs: add dax mmap support Goldwyn Rodrigues
2019-03-28 15:45   ` Darrick J. Wong
2019-03-26 19:02 ` [PATCH 10/15] btrfs: Add dax specific address_space_operations Goldwyn Rodrigues
2019-03-26 19:02 ` [PATCH 11/15] fs: dedup file range to use a compare function Goldwyn Rodrigues
2019-03-28 17:04   ` Darrick J. Wong
2019-04-01 20:36     ` Goldwyn Rodrigues
2019-03-26 19:02 ` [PATCH 12/15] btrfs: trace functions for btrfs_iomap_begin/end Goldwyn Rodrigues
2019-03-26 19:02 ` [PATCH 13/15] btrfs: handle dax page zeroing Goldwyn Rodrigues
2019-03-26 19:03 ` [PATCH 14/15] btrfs: Disable dax-based defrag and send Goldwyn Rodrigues
2019-03-26 19:03 ` [PATCH 15/15] btrfs: Writeprotect mmap pages on snapshot Goldwyn Rodrigues
2019-03-28 15:48   ` Darrick J. Wong
2019-03-26 19:09 ` [PATCH v2 00/15] btrfs dax support Goldwyn Rodrigues
2019-03-27 20:14   ` Adam Borowski
2019-03-27 23:26     ` Goldwyn Rodrigues
2019-03-28 10:24       ` [PATCH] btrfs: allow MAP_SYNC mmap Adam Borowski
2019-03-28 10:42         ` Adam Borowski
2019-04-01 20:08         ` Goldwyn Rodrigues

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