kernel/drivers/s390/block/dasd_eckd.c, branch linux-rolling-stable

s390/dasd: Copy detected format information to secondary device

2026-03-19T15:15:26Z

commit 4c527c7e030672efd788d0806d7a68972a7ba3c1 upstream. During online processing for a DASD device an IO operation is started to determine the format of the device. CDL format contains specifically sized blocks at the beginning of the disk. For a PPRC secondary device no real IO operation is possible therefore this IO request can not be started and this step is skipped for online processing of secondary devices. This is generally fine since the secondary is a copy of the primary device. In case of an additional partition detection that is run after a swap operation the format information is needed to properly drive partition detection IO. Currently the information is not passed leading to IO errors during partition detection and a wrongly detected partition table which in turn might lead to data corruption on the disk with the wrong partition table. Fix by passing the format information from primary to secondary device. Fixes: 413862caad6f ("s390/dasd: add copy pair swap capability") Cc: stable@vger.kernel.org #6.1 Reviewed-by: Jan Hoeppner Acked-by: Eduard Shishkin Signed-off-by: Stefan Haberland Link: https://patch.msgid.link/20260310142330.4080106-3-sth@linux.ibm.com Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman

s390/dasd: Move quiesce state with pprc swap

2026-03-19T15:15:26Z

commit 40e9cd4ae8ec43b107ed2bff422a8fa39dcf4e4b upstream. Quiesce and resume is a mechanism to suspend operations on DASD devices. In the context of a controlled copy pair swap operation, the quiesce operation is usually issued before the actual swap and a resume afterwards. During the swap operation, the underlying device is exchanged. Therefore, the quiesce flag must be moved to the secondary device to ensure a consistent quiesce state after the swap. The secondary device itself cannot be suspended separately because there is no separate block device representation for it. Fixes: 413862caad6f ("s390/dasd: add copy pair swap capability") Cc: stable@vger.kernel.org #6.1 Reviewed-by: Jan Hoeppner Signed-off-by: Stefan Haberland Link: https://patch.msgid.link/20260310142330.4080106-2-sth@linux.ibm.com Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman

Merge tag 'for-6.19/block-20251201' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux

2025-12-04T03:26:18Z

Pull block updates from Jens Axboe: - Fix head insertion for mq-deadline, a regression from when priority support was added - Series simplifying and improving the ublk user copy code - Various ublk related cleanups - Fixup REQ_NOWAIT handling in loop/zloop, clearing NOWAIT when the request is punted to a thread for handling - Merge and then later revert loop dio nowait support, as it ended up causing excessive stack usage for when the inline issue code needs to dip back into the full file system code - Improve auto integrity code, making it less deadlock prone - Speedup polled IO handling, but manually managing the hctx lookups - Fixes for blk-throttle for SSD devices - Small series with fixes for the S390 dasd driver - Add support for caching zones, avoiding unnecessary report zone queries - MD pull requests via Yu: - fix null-ptr-dereference regression for dm-raid0 - fix IO hang for raid5 when array is broken with IO inflight - remove legacy 1s delay to speed up system shutdown - change maintainer's email address - data can be lost if array is created with different lbs devices, fix this problem and record lbs of the array in metadata - fix rcu protection for md_thread - fix mddev kobject lifetime regression - enable atomic writes for md-linear - some cleanups - bcache updates via Coly - remove useless discard and cache device code - improve usage of per-cpu workqueues - Reorganize the IO scheduler switching code, fixing some lockdep reports as well - Improve the block layer P2P DMA support - Add support to the block tracing code for zoned devices - Segment calculation improves, and memory alignment flexibility improvements - Set of prep and cleanups patches for ublk batching support. The actual batching hasn't been added yet, but helps shrink down the workload of getting that patchset ready for 6.20 - Fix for how the ps3 block driver handles segments offsets - Improve how block plugging handles batch tag allocations - nbd fixes for use-after-free of the configuration on device clear/put - Set of improvements and fixes for zloop - Add Damien as maintainer of the block zoned device code handling - Various other fixes and cleanups * tag 'for-6.19/block-20251201' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux: (162 commits) block/rnbd: correct all kernel-doc complaints blk-mq: use queue_hctx in blk_mq_map_queue_type md: remove legacy 1s delay in md_notify_reboot md/raid5: fix IO hang when array is broken with IO inflight md: warn about updating super block failure md/raid0: fix NULL pointer dereference in create_strip_zones() for dm-raid sbitmap: fix all kernel-doc warnings ublk: add helper of __ublk_fetch() ublk: pass const pointer to ublk_queue_is_zoned() ublk: refactor auto buffer register in ublk_dispatch_req() ublk: add `union ublk_io_buf` with improved naming ublk: add parameter `struct io_uring_cmd *` to ublk_prep_auto_buf_reg() kfifo: add kfifo_alloc_node() helper for NUMA awareness blk-mq: fix potential uaf for 'queue_hw_ctx' blk-mq: use array manage hctx map instead of xarray ublk: prevent invalid access with DEBUG s390/dasd: Use scnprintf() instead of sprintf() s390/dasd: Move device name formatting into separate function s390/dasd: Remove unnecessary debugfs_create() return checks s390/dasd: Fix gendisk parent after copy pair swap ...

s390/dasd: Fix gendisk parent after copy pair swap

2025-11-26T17:14:16Z

After a copy pair swap the block device's "device" symlink points to the secondary CCW device, but the gendisk's parent remained the primary, leaving /sys/block/ under the wrong parent. Move the gendisk to the secondary's device with device_move(), keeping the sysfs topology consistent after the swap. Fixes: 413862caad6f ("s390/dasd: add copy pair swap capability") Cc: stable@vger.kernel.org #6.1 Reviewed-by: Jan Hoeppner Signed-off-by: Stefan Haberland Signed-off-by: Jens Axboe

s390: Remove compat support

2025-11-17T10:10:38Z

There shouldn't be any 31 bit code around anymore that matters. Remove the compat layer support required to run 31 bit code. Reason for removal is code simplification and reduced test effort. Note that this comes without any deprecation warnings added to config options, or kernel messages, since most likely those would be ignored anyway. If it turns out there is still a reason to keep the compat layer this can be reverted at any time in the future. Reviewed-by: Arnd Bergmann Signed-off-by: Heiko Carstens

s390: Convert MACHINE_IS_[LPAR|VM|KVM], etc, machine_is_[lpar|vm|kvm]()

2025-03-04T16:18:07Z

Move machine type detection to the decompressor and use static branches to implement and use machine_is_[lpar|vm|kvm]() instead of a runtime check via MACHINE_IS_[LPAR|VM|KVM]. Reviewed-by: Vasily Gorbik Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/dasd: Fix typo in comment

2024-11-10T03:06:58Z

Fix typo in comment: requeust->request, Removve->Remove, notthing->nothing. Signed-off-by: Yu Jiaoliang Signed-off-by: Stefan Haberland Link: https://lore.kernel.org/r/20241108133913.3068782-3-sth@linux.ibm.com Signed-off-by: Jens Axboe

s390/dasd: fix error recovery leading to data corruption on ESE devices

2024-08-12T16:31:08Z

Extent Space Efficient (ESE) or thin provisioned volumes need to be formatted on demand during usual IO processing. The dasd_ese_needs_format function checks for error codes that signal the non existence of a proper track format. The check for incorrect length is to imprecise since other error cases leading to transport of insufficient data also have this flag set. This might lead to data corruption in certain error cases for example during a storage server warmstart. Fix by removing the check for incorrect length and replacing by explicitly checking for invalid track format in transport mode. Also remove the check for file protected since this is not a valid ESE handling case. Cc: stable@vger.kernel.org # 5.3+ Fixes: 5e2b17e712cf ("s390/dasd: Add dynamic formatting support for ESE volumes") Reviewed-by: Jan Hoeppner Signed-off-by: Stefan Haberland Link: https://lore.kernel.org/r/20240812125733.126431-3-sth@linux.ibm.com Signed-off-by: Jens Axboe

Merge tag 'for-6.11/block-20240722' of git://git.kernel.dk/linux

2024-07-22T18:32:05Z

Pull more block updates from Jens Axboe: - MD fixes via Song: - md-cluster fixes (Heming Zhao) - raid1 fix (Mateusz Jończyk) - s390/dasd module description (Jeff) - Series cleaning up and hardening the blk-mq debugfs flag handling (John, Christoph) - blk-cgroup cleanup (Xiu) - Error polled IO attempts if backend doesn't support it (hexue) - Fix for an sbitmap hang (Yang) * tag 'for-6.11/block-20240722' of git://git.kernel.dk/linux: (23 commits) blk-cgroup: move congestion_count to struct blkcg sbitmap: fix io hung due to race on sbitmap_word::cleared block: avoid polling configuration errors block: Catch possible entries missing from rqf_name[] block: Simplify definition of RQF_NAME() block: Use enum to define RQF_x bit indexes block: Catch possible entries missing from cmd_flag_name[] block: Catch possible entries missing from alloc_policy_name[] block: Catch possible entries missing from hctx_flag_name[] block: Catch possible entries missing from hctx_state_name[] block: Catch possible entries missing from blk_queue_flag_name[] block: Make QUEUE_FLAG_x as an enum block: Relocate BLK_MQ_MAX_DEPTH block: Relocate BLK_MQ_CPU_WORK_BATCH block: remove QUEUE_FLAG_STOPPED block: Add missing entry to hctx_flag_name[] block: Add zone write plugging entry to rqf_name[] block: Add missing entries from cmd_flag_name[] s390/dasd: fix error checks in dasd_copy_pair_store() s390/dasd: add missing MODULE_DESCRIPTION() macros ...

s390/dasd: add missing MODULE_DESCRIPTION() macros

2024-07-15T16:57:39Z

With ARCH=s390, make allmodconfig && make W=1 C=1 reports: WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/s390/block/dasd_diag_mod.o WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/s390/block/dasd_eckd_mod.o WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/s390/block/dasd_fba_mod.o Add the missing invocations of the MODULE_DESCRIPTION() macro. Signed-off-by: Jeff Johnson Signed-off-by: Stefan Haberland Link: https://lore.kernel.org/r/20240715112434.2111291-2-sth@linux.ibm.com Signed-off-by: Jens Axboe