linux-stable.git/Documentation/admin-guide/blockdev/zoned_loop.rst, branch linux-rolling-lts Linux kernel stable tree zloop: truncate finished zones to zone capacity 2026-09-07T15:22:59+00:00 Xu Rao raoxu@uniontech.com 2026-08-04T02:34:03+00:00 c3c7e87c76b42e640ef1d60c37b81b0e9f5ffd1d commit 72e67c118642634c25465db0c8bcfa54c4ce086c upstream. The size of a sequential zone backing file records the amount of data written and is used to restore the zone state. A backing file whose size is equal to the zone capacity is restored as a full zone, while a file larger than the zone capacity is rejected as invalid. However, zloop_finish_zone() currently truncates the backing file to the zone size. For devices with a reduced zone capacity, finishing a zone therefore creates a backing file larger than the zone capacity. After the device is removed and later re-added, that zone file is rejected instead of being restored as a full zone. Truncate finished sequential zones to the zone capacity, matching the persistent representation accepted by zloop_update_seq_zone() for a full zone. Suggested-by: Damien Le Moal <dlemoal@kernel.org> Fixes: eb0570c7df23 ("block: new zoned loop block device driver") Cc: stable@vger.kernel.org Signed-off-by: Xu Rao <raoxu@uniontech.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Link: https://patch.msgid.link/B39E5FD81D1A07F4+20260804023403.939767-1-raoxu@uniontech.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 72e67c118642634c25465db0c8bcfa54c4ce086c upstream.

The size of a sequential zone backing file records the amount of data
written and is used to restore the zone state. A backing file whose size
is equal to the zone capacity is restored as a full zone, while a file
larger than the zone capacity is rejected as invalid.

However, zloop_finish_zone() currently truncates the backing file to the
zone size. For devices with a reduced zone capacity, finishing a zone
therefore creates a backing file larger than the zone capacity. After the
device is removed and later re-added, that zone file is rejected instead
of being restored as a full zone.

Truncate finished sequential zones to the zone capacity, matching the
persistent representation accepted by zloop_update_seq_zone() for a full
zone.

Suggested-by: Damien Le Moal <dlemoal@kernel.org>
Fixes: eb0570c7df23 ("block: new zoned loop block device driver")
Cc: stable@vger.kernel.org
Signed-off-by: Xu Rao <raoxu@uniontech.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://patch.msgid.link/B39E5FD81D1A07F4+20260804023403.939767-1-raoxu@uniontech.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Docs: admin-guide: Correct spelling mistake 2025-08-13T11:33:09+00:00 Erick Karanja karanja99erick@gmail.com 2025-08-13T07:18:36+00:00 f7a2e1c08727384cde1c686dd57172f99b5f2e6e Fix spelling mistake directoy to directory Reported-by: codespell Signed-off-by: Erick Karanja <karanja99erick@gmail.com> Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Link: https://lore.kernel.org/r/20250813071837.668613-1-karanja99erick@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk> 
Fix spelling mistake directoy to directory

Reported-by: codespell

Signed-off-by: Erick Karanja <karanja99erick@gmail.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20250813071837.668613-1-karanja99erick@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Documentation: Document the new zoned loop block device driver 2025-05-01T23:03:56+00:00 Damien Le Moal dlemoal@kernel.org 2025-04-07T07:52:22+00:00 9e4f11c1228cc8ebf236cfa51d44abafec80f326 Introduce the zoned_loop.rst documentation file under admin-guide/blockdev to document the zoned loop block device driver. An overview of the driver is provided and its usage to create and delete zoned devices described. Signed-off-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Link: https://lore.kernel.org/r/20250407075222.170336-3-dlemoal@kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk> 
Introduce the zoned_loop.rst documentation file under
admin-guide/blockdev to document the zoned loop block device driver.
An overview of the driver is provided and its usage to create and delete
zoned devices described.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20250407075222.170336-3-dlemoal@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>