#
522d7352 |
| 22-Feb-2024 |
Damien Le Moal <dlemoal@kernel.org> |
block: Do not include rbtree.h in blk-zoned.c
The block zone code does not use RB-tree. So remove the include of linux/rbtree.h as it is not needed.
Signed-off-by: Damien Le Moal <dlemoal@kernel.or
block: Do not include rbtree.h in blk-zoned.c
The block zone code does not use RB-tree. So remove the include of linux/rbtree.h as it is not needed.
Signed-off-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Link: https://lore.kernel.org/r/20240222131724.1803520-2-dlemoal@kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
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71f4ecdb |
| 29-Jan-2024 |
Johannes Thumshirn <johannes.thumshirn@wdc.com> |
block: remove gfp_flags from blkdev_zone_mgmt
Now that all callers pass in GFP_KERNEL to blkdev_zone_mgmt() and use memalloc_no{io,fs}_{save,restore}() to define the allocation scope, we can drop th
block: remove gfp_flags from blkdev_zone_mgmt
Now that all callers pass in GFP_KERNEL to blkdev_zone_mgmt() and use memalloc_no{io,fs}_{save,restore}() to define the allocation scope, we can drop the gfp_mask parameter from blkdev_zone_mgmt() as well as blkdev_zone_reset_all() and blkdev_zone_reset_all_emulated().
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: Mike Snitzer <snitzer@kernel.org> Link: https://lore.kernel.org/r/20240128-zonefs_nofs-v3-5-ae3b7c8def61@wdc.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
587371ed |
| 07-Jan-2024 |
Damien Le Moal <dlemoal@kernel.org> |
block: Treat sequential write preferred zone type as invalid
With the removal of the support for host-aware zoned devices, blk_revalidate_zone_cb() should never see the zone type BLK_ZONE_TYPE_SEQWR
block: Treat sequential write preferred zone type as invalid
With the removal of the support for host-aware zoned devices, blk_revalidate_zone_cb() should never see the zone type BLK_ZONE_TYPE_SEQWRITE_PREF (sequential write preffered zones). Treat this zone type as being invalid.
Fixes: 7437bb73f087 ("block: remove support for the host aware zone model") Signed-off-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20240107072212.1071080-1-dlemoal@kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
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4e33b071 |
| 28-Dec-2023 |
Christoph Hellwig <hch@lst.de> |
block: remove disk_clear_zoned
disk_clear_zoned is unused now that the last warts of the host-aware model support in sd are gone.
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes R
block: remove disk_clear_zoned
disk_clear_zoned is unused now that the last warts of the host-aware model support in sd are gone.
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Link: https://lore.kernel.org/r/20231228075141.362560-3-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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5165799f |
| 21-Dec-2023 |
Jens Axboe <axboe@kernel.dk> |
block: export disk_clear_zoned()
A previous commit split disk_set_zoned(..., bool) into not taking an argument for whether to set or clear, and instead added disk_clear_zoned() as the counterpart. H
block: export disk_clear_zoned()
A previous commit split disk_set_zoned(..., bool) into not taking an argument for whether to set or clear, and instead added disk_clear_zoned() as the counterpart. However, that commit neglected to export the new symbol, causing failures for modular drivers that used it.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Fixes: d73e93b4dfab ("block: simplify disk_set_zoned") Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
d73e93b4 |
| 17-Dec-2023 |
Christoph Hellwig <hch@lst.de> |
block: simplify disk_set_zoned
Only use disk_set_zoned to actually enable zoned device support. For clearing it, call disk_clear_zoned, which is renamed from disk_clear_zone_settings and now directl
block: simplify disk_set_zoned
Only use disk_set_zoned to actually enable zoned device support. For clearing it, call disk_clear_zoned, which is renamed from disk_clear_zone_settings and now directly clears the zoned flag as well.
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Link: https://lore.kernel.org/r/20231217165359.604246-5-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
03e51c4a |
| 03-Jul-2023 |
Damien Le Moal <dlemoal@kernel.org> |
scsi: block: Improve checks in blk_revalidate_disk_zones()
blk_revalidate_disk_zones() implements checks of the zones of a zoned block device, verifying that the zone size is a power of 2 number of
scsi: block: Improve checks in blk_revalidate_disk_zones()
blk_revalidate_disk_zones() implements checks of the zones of a zoned block device, verifying that the zone size is a power of 2 number of sectors, that all zones (except possibly the last one) have the same size and that zones cover the entire addressing space of the device.
While these checks are appropriate to verify that well tested hardware devices have an adequate zone configurations, they lack in certain areas which may result in issues with emulated devices implemented with user drivers such as ublk or tcmu. Specifically, this function does not check if the device driver indicated support for the mandatory zone append writes, that is, if the device max_zone_append_sectors queue limit is set to a non-zero value. Additionally, invalid zones such as a zero length zone with a start sector equal to the device capacity will not be detected and result in out of bounds use of the zone bitmaps prepared with the callback function blk_revalidate_zone_cb().
Improve blk_revalidate_disk_zones() to address these inadequate checks, relying on the fact that all device drivers supporting zoned block devices must set the device zone size (chunk_sectors queue limit) and the max_zone_append_sectors queue limit before executing this function.
The check for a non-zero max_zone_append_sectors value is done in blk_revalidate_disk_zones() before executing the zone report. The zone report callback function blk_revalidate_zone_cb() is also modified to add a check that a zone start is below the device capacity.
The check that the zone size is a power of 2 number of sectors is moved to blk_revalidate_disk_zones() as the zone size is already known. Similarly, the number of zones of the device can be calculated in blk_revalidate_disk_zones() before executing the zone report.
The kdoc comment for blk_revalidate_disk_zones() is also updated to mention that device drivers must set the device zone size and the max_zone_append_sectors queue limit before calling this function.
Signed-off-by: Damien Le Moal <dlemoal@kernel.org> Link: https://lore.kernel.org/r/20230703024812.76778-6-dlemoal@kernel.org Reviewed-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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#
05bdb996 |
| 08-Jun-2023 |
Christoph Hellwig <hch@lst.de> |
block: replace fmode_t with a block-specific type for block open flags
The only overlap between the block open flags mapped into the fmode_t and other uses of fmode_t are FMODE_READ and FMODE_WRITE.
block: replace fmode_t with a block-specific type for block open flags
The only overlap between the block open flags mapped into the fmode_t and other uses of fmode_t are FMODE_READ and FMODE_WRITE. Define a new blk_mode_t instead for use in blkdev_get_by_{dev,path}, ->open and ->ioctl and stop abusing fmode_t.
Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Jack Wang <jinpu.wang@ionos.com> [rnbd] Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Christian Brauner <brauner@kernel.org> Link: https://lore.kernel.org/r/20230608110258.189493-28-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
5e4ea834 |
| 08-Jun-2023 |
Christoph Hellwig <hch@lst.de> |
block: remove unused fmode_t arguments from ioctl handlers
A few ioctl handlers have fmode_t arguments that are entirely unused, remove them.
Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by:
block: remove unused fmode_t arguments from ioctl handlers
A few ioctl handlers have fmode_t arguments that are entirely unused, remove them.
Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Christian Brauner <brauner@kernel.org> Reviewed-by: Hannes Reinecke <hare@suse.de> Link: https://lore.kernel.org/r/20230608110258.189493-27-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
19821fee |
| 17-May-2023 |
Bart Van Assche <bvanassche@acm.org> |
block: Introduce blk_rq_is_seq_zoned_write()
Introduce the function blk_rq_is_seq_zoned_write(). This function will be used in later patches to preserve the order of zoned writes that require write
block: Introduce blk_rq_is_seq_zoned_write()
Introduce the function blk_rq_is_seq_zoned_write(). This function will be used in later patches to preserve the order of zoned writes that require write serialization.
This patch includes an optimization: instead of using rq->q->disk->part0->bd_queue to check whether or not the queue is associated with a zoned block device, use rq->q->disk->queue.
Cc: Christoph Hellwig <hch@lst.de> Cc: Damien Le Moal <dlemoal@kernel.org> Cc: Ming Lei <ming.lei@redhat.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Link: https://lore.kernel.org/r/20230517174230.897144-6-bvanassche@acm.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
4f51644c |
| 17-May-2023 |
Bart Van Assche <bvanassche@acm.org> |
block: Simplify blk_req_needs_zone_write_lock()
Remove the blk_rq_is_passthrough() check because it is redundant: blk_req_needs_zone_write_lock() also calls bdev_op_is_zoned_write() and the latter f
block: Simplify blk_req_needs_zone_write_lock()
Remove the blk_rq_is_passthrough() check because it is redundant: blk_req_needs_zone_write_lock() also calls bdev_op_is_zoned_write() and the latter function returns false for pass-through requests.
Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Cc: Ming Lei <ming.lei@redhat.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Link: https://lore.kernel.org/r/20230517174230.897144-3-bvanassche@acm.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
9e0c7efa |
| 03-Feb-2023 |
Juhyung Park <qkrwngud825@gmail.com> |
block: remove more NULL checks after bdev_get_queue()
bdev_get_queue() never returns NULL. Several commits [1][2] have been made before to remove such superfluous checks, but some still remained.
F
block: remove more NULL checks after bdev_get_queue()
bdev_get_queue() never returns NULL. Several commits [1][2] have been made before to remove such superfluous checks, but some still remained.
For places where bdev_get_queue() is called solely for NULL checks, it is removed entirely.
[1] commit ec9fd2a13d74 ("blk-lib: don't check bdev_get_queue() NULL check") [2] commit fea127b36c93 ("block: remove superfluous check for request queue in bdev_is_zoned()")
Signed-off-by: Juhyung Park <qkrwngud825@gmail.com> Reviewed-by: Pankaj Raghav <p.raghav@samsung.com> Link: https://lore.kernel.org/r/20230203024029.48260-1-qkrwngud825@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
e29b2100 |
| 10-Jan-2023 |
Pankaj Raghav <p.raghav@samsung.com> |
block: add a new helper bdev_{is_zone_start, offset_from_zone_start}
Instead of open coding to check for zone start, add a helper to improve readability and store the logic in one place.
Reviewed-b
block: add a new helper bdev_{is_zone_start, offset_from_zone_start}
Instead of open coding to check for zone start, add a helper to improve readability and store the logic in one place.
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Pankaj Raghav <p.raghav@samsung.com> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Link: https://lore.kernel.org/r/20230110143635.77300-3-p.raghav@samsung.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
8cafdb5a |
| 29-Sep-2022 |
Pankaj Raghav <p.raghav@samsung.com> |
block: adapt blk_mq_plug() to not plug for writes that require a zone lock
The current implementation of blk_mq_plug() disables plugging for all operations that involves a transfer to the device as
block: adapt blk_mq_plug() to not plug for writes that require a zone lock
The current implementation of blk_mq_plug() disables plugging for all operations that involves a transfer to the device as we just check if the last bit in op_is_write() function.
Modify blk_mq_plug() to disable plugging only for REQ_OP_WRITE and REQ_OP_WRITE_ZEROS as they might require a zone lock.
Suggested-by: Christoph Hellwig <hch@lst.de> Suggested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Pankaj Raghav <p.raghav@samsung.com> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Link: https://lore.kernel.org/r/20220929074745.103073-2-p.raghav@samsung.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
ff07a02e |
| 14-Jul-2022 |
Bart Van Assche <bvanassche@acm.org> |
treewide: Rename enum req_opf into enum req_op
The type name enum req_opf is misleading since it suggests that values of this type include both an operation type and flags. Since values of this type
treewide: Rename enum req_opf into enum req_op
The type name enum req_opf is misleading since it suggests that values of this type include both an operation type and flags. Since values of this type represent an operation only, change the type name into enum req_op.
Convert the enum req_op documentation into kernel-doc format. Move a few definitions such that the enum req_op documentation occurs just above the enum req_op definition.
The name "req_opf" was introduced by commit ef295ecf090d ("block: better op and flags encoding").
Cc: Christoph Hellwig <hch@lst.de> Cc: Ming Lei <ming.lei@redhat.com> Cc: Hannes Reinecke <hare@suse.de> Cc: Damien Le Moal <damien.lemoal@wdc.com> Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Link: https://lore.kernel.org/r/20220714180729.1065367-2-bvanassche@acm.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
d86e716a |
| 06-Jul-2022 |
Christoph Hellwig <hch@lst.de> |
block: move zone related fields to struct gendisk
Move the zone related fields that are currently stored in struct request_queue to struct gendisk as these are part of the highlevel block layer API
block: move zone related fields to struct gendisk
Move the zone related fields that are currently stored in struct request_queue to struct gendisk as these are part of the highlevel block layer API and are only used for non-passthrough I/O that requires the gendisk.
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Link: https://lore.kernel.org/r/20220706070350.1703384-17-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
375c140c |
| 06-Jul-2022 |
Christoph Hellwig <hch@lst.de> |
block: use bdev based helpers in blkdev_zone_mgmt{,all}
Use the bdev based helpers instead of the queue based ones to clean up the code a bit and prepare for storing all zone related fields in struc
block: use bdev based helpers in blkdev_zone_mgmt{,all}
Use the bdev based helpers instead of the queue based ones to clean up the code a bit and prepare for storing all zone related fields in struct gendisk.
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Link: https://lore.kernel.org/r/20220706070350.1703384-13-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
b623e347 |
| 06-Jul-2022 |
Christoph Hellwig <hch@lst.de> |
block: replace blkdev_nr_zones with bdev_nr_zones
Pass a block_device instead of a request_queue as that is what most callers have at hand.
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by
block: replace blkdev_nr_zones with bdev_nr_zones
Pass a block_device instead of a request_queue as that is what most callers have at hand.
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Acked-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Link: https://lore.kernel.org/r/20220706070350.1703384-12-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
5d400665 |
| 06-Jul-2022 |
Christoph Hellwig <hch@lst.de> |
block: pass a gendisk to blk_queue_free_zone_bitmaps
Switch to a gendisk based API in preparation for moving all zone related fields from the request_queue to the gendisk.
Signed-off-by: Christoph
block: pass a gendisk to blk_queue_free_zone_bitmaps
Switch to a gendisk based API in preparation for moving all zone related fields from the request_queue to the gendisk.
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Link: https://lore.kernel.org/r/20220706070350.1703384-9-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
b3c72f81 |
| 06-Jul-2022 |
Christoph Hellwig <hch@lst.de> |
block: pass a gendisk to blk_queue_clear_zone_settings
Switch to a gendisk based API in preparation for moving all zone related fields from the request_queue to the gendisk.
Signed-off-by: Christop
block: pass a gendisk to blk_queue_clear_zone_settings
Switch to a gendisk based API in preparation for moving all zone related fields from the request_queue to the gendisk.
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Link: https://lore.kernel.org/r/20220706070350.1703384-8-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
edd1dbc8 |
| 06-Jul-2022 |
Christoph Hellwig <hch@lst.de> |
block: use bdev_is_zoned instead of open coding it
Use bdev_is_zoned in all places where a block_device is available instead of open coding it.
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewe
block: use bdev_is_zoned instead of open coding it
Use bdev_is_zoned in all places where a block_device is available instead of open coding it.
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Link: https://lore.kernel.org/r/20220706070350.1703384-4-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
73bd66d9 |
| 09-Feb-2022 |
Christoph Hellwig <hch@lst.de> |
scsi: block: Remove REQ_OP_WRITE_SAME support
No more users of REQ_OP_WRITE_SAME or drivers implementing it are left, so remove the infrastructure.
[mkp: fold in and tweak sysfs reporting fix]
Lin
scsi: block: Remove REQ_OP_WRITE_SAME support
No more users of REQ_OP_WRITE_SAME or drivers implementing it are left, so remove the infrastructure.
[mkp: fold in and tweak sysfs reporting fix]
Link: https://lore.kernel.org/r/20220209082828.2629273-8-hch@lst.de Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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#
49add496 |
| 24-Jan-2022 |
Christoph Hellwig <hch@lst.de> |
block: pass a block_device and opf to bio_init
Pass the block_device that we plan to use this bio for and the operation to bio_init to optimize the assignment. A NULL block_device can be passed, bo
block: pass a block_device and opf to bio_init
Pass the block_device that we plan to use this bio for and the operation to bio_init to optimize the assignment. A NULL block_device can be passed, both for the passthrough case on a raw request_queue and to temporarily avoid refactoring some nasty code.
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Link: https://lore.kernel.org/r/20220124091107.642561-19-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
0a3140ea |
| 24-Jan-2022 |
Chaitanya Kulkarni <kch@nvidia.com> |
block: pass a block_device and opf to blk_next_bio
All callers need to set the block_device and operation, so lift that into the common code.
Signed-off-by: Chaitanya Kulkarni <kch@nvidia.com> Sign
block: pass a block_device and opf to blk_next_bio
All callers need to set the block_device and operation, so lift that into the common code.
Signed-off-by: Chaitanya Kulkarni <kch@nvidia.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220124091107.642561-15-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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#
86399ea0 |
| 11-Nov-2021 |
Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com> |
block: Hold invalidate_lock in BLKRESETZONE ioctl
When BLKRESETZONE ioctl and data read race, the data read leaves stale page cache. The commit e5113505904e ("block: Discard page cache of zone reset
block: Hold invalidate_lock in BLKRESETZONE ioctl
When BLKRESETZONE ioctl and data read race, the data read leaves stale page cache. The commit e5113505904e ("block: Discard page cache of zone reset target range") added page cache truncation to avoid stale page cache after the ioctl. However, the stale page cache still can be read during the reset zone operation for the ioctl. To avoid the stale page cache completely, hold invalidate_lock of the block device file mapping.
Fixes: e5113505904e ("block: Discard page cache of zone reset target range") Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com> Cc: stable@vger.kernel.org # v5.15 Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20211111085238.942492-1-shinichiro.kawasaki@wdc.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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