From: Josef Bacik <josef@toxicpanda.com>
To: Naohiro Aota <naohiro.aota@wdc.com>,
linux-btrfs@vger.kernel.org, dsterba@suse.com
Cc: hare@suse.com, linux-fsdevel@vger.kernel.org,
Jens Axboe <axboe@kernel.dk>,
Christoph Hellwig <hch@infradead.org>,
"Darrick J. Wong" <darrick.wong@oracle.com>
Subject: Re: [PATCH v12 04/41] btrfs: use regular SB location on emulated zoned mode
Date: Fri, 15 Jan 2021 17:20:45 -0500 [thread overview]
Message-ID: <13285359-e64c-a2db-1d9d-20b523e0c510@toxicpanda.com> (raw)
In-Reply-To: <30ac9e674289d206ec9299228d38cd7d03cd16c4.1610693037.git.naohiro.aota@wdc.com>
On 1/15/21 1:53 AM, Naohiro Aota wrote:
> The zoned btrfs puts a superblock at the beginning of SB logging zones
> if the zone is conventional. This difference causes a chicken-and-egg
> problem for emulated zoned mode. Since the device is a regular
> (non-zoned) device, we cannot know if the btrfs is regular or emulated
> zoned while we read the superblock. But, to load proper superblock, we
> need to see if it is emulated zoned or not.
>
> We place the SBs at the same location as the regular btrfs on emulated
> zoned mode to solve the problem. It is possible because it's ensured
> that all the SB locations are at a conventional zone on emulated zoned
> mode.
>
> Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Ok so in emulated mode we simply won't be able to test the SB logging stuff. I
think this is an OK trade-off,
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Thanks,
Josef
next prev parent reply other threads:[~2021-01-15 22:21 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-15 6:53 [PATCH v12 00/41] btrfs: zoned block device support Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 01/41] block: add bio_add_zone_append_page Naohiro Aota
2021-01-15 22:03 ` Josef Bacik
2021-01-20 13:34 ` Johannes Thumshirn
2021-01-15 6:53 ` [PATCH v12 02/41] iomap: support REQ_OP_ZONE_APPEND Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 03/41] btrfs: defer loading zone info after opening trees Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 04/41] btrfs: use regular SB location on emulated zoned mode Naohiro Aota
2021-01-15 22:20 ` Josef Bacik [this message]
2021-01-15 6:53 ` [PATCH v12 05/41] btrfs: release path before calling into btrfs_load_block_group_zone_info Naohiro Aota
2021-01-15 22:22 ` Josef Bacik
2021-01-18 8:55 ` Johannes Thumshirn
2021-01-15 6:53 ` [PATCH v12 06/41] btrfs: do not load fs_info->zoned from incompat flag Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 07/41] btrfs: disallow fitrim in ZONED mode Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 08/41] btrfs: allow zoned mode on non-zoned block devices Naohiro Aota
2021-01-15 22:07 ` Josef Bacik
2021-01-18 14:15 ` Naohiro Aota
2021-01-19 0:28 ` Anand Jain
2021-01-15 6:53 ` [PATCH v12 08/41] btrfs: emulated zoned mode on non-zoned devices Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 09/41] btrfs: implement zoned chunk allocator Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 10/41] btrfs: verify device extent is aligned to zone Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 11/41] btrfs: load zone's allocation offset Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 12/41] btrfs: calculate allocation offset for conventional zones Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 13/41] btrfs: track unusable bytes for zones Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 14/41] btrfs: do sequential extent allocation in ZONED mode Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 15/41] btrfs: redirty released extent buffers " Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 16/41] btrfs: advance allocation pointer after tree log node Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 17/41] btrfs: enable to mount ZONED incompat flag Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 18/41] btrfs: reset zones of unused block groups Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 19/41] btrfs: extract page adding function Naohiro Aota
2021-01-15 22:14 ` Josef Bacik
2021-01-15 6:53 ` [PATCH v12 20/41] btrfs: use bio_add_zone_append_page for zoned btrfs Naohiro Aota
2021-01-15 22:16 ` Josef Bacik
2021-01-15 6:53 ` [PATCH v12 21/41] btrfs: handle REQ_OP_ZONE_APPEND as writing Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 22/41] btrfs: split ordered extent when bio is sent Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 23/41] btrfs: extend btrfs_rmap_block for specifying a device Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 24/41] btrfs: cache if block-group is on a sequential zone Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 25/41] btrfs: save irq flags when looking up an ordered extent Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 26/41] btrfs: use ZONE_APPEND write for ZONED btrfs Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 27/41] btrfs: enable zone append writing for direct IO Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 28/41] btrfs: introduce dedicated data write path for ZONED mode Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 29/41] btrfs: serialize meta IOs on " Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 30/41] btrfs: wait existing extents before truncating Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 31/41] btrfs: avoid async metadata checksum on ZONED mode Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 32/41] btrfs: mark block groups to copy for device-replace Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 33/41] btrfs: implement cloning for ZONED device-replace Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 34/41] btrfs: implement copying " Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 35/41] btrfs: support dev-replace in ZONED mode Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 36/41] btrfs: enable relocation " Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 37/41] btrfs: relocate block group to repair IO failure in ZONED Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 38/41] btrfs: split alloc_log_tree() Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 39/41] btrfs: extend zoned allocator to use dedicated tree-log block group Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 40/41] btrfs: serialize log transaction on ZONED mode Naohiro Aota
2021-01-15 6:53 ` [PATCH v12 41/41] btrfs: reorder log node allocation Naohiro Aota
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