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path: root/drivers/block/null_blk_main.c
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2019-12-04null_blk: remove unused variable warning on !CONFIG_BLK_DEV_ZONEDJens Axboe
If BLK_DEV_ZONED isn't set, 'ret' isn't used. This makes gcc complain, rightfully. Move ret where it is used. Fixes: 979d54475e0b ("null_blk: cleanup null_gendisk_register") Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-12-03block: set the zone size in blk_revalidate_disk_zones atomicallyChristoph Hellwig
The current zone revalidation code has a major problem in that it doesn't update the zone size and q->nr_zones atomically, leading to a short window where an out of bounds access to the zone arrays is possible. To fix this move the setting of the zone size into the crticial sections blk_revalidate_disk_zones so that it gets updated together with the zone bitmaps and q->nr_zones. This also slightly simplifies the caller as it deducts the zone size from the report_zones. This change also allows to check for a power of two zone size in generic code. Reported-by: Hans Holmberg <hans@owltronix.com> Reviewed-by: Javier González <javier@javigon.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-12-03block: don't handle bio based drivers in blk_revalidate_disk_zonesChristoph Hellwig
bio based drivers only need to update q->nr_zones. Do that manually instead of overloading blk_revalidate_disk_zones to keep that function simpler for the next round of changes that will rely even more on the request based functionality. Reviewed-by: Javier González <javier@javigon.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-12-03null_blk: cleanup null_gendisk_registerChristoph Hellwig
Use a saner size calculation, and do a trivial cleanup on the zone revalidation to prepare to future changes. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-12-03null_blk: fix zone size paramter checkDamien Le Moal
For zoned=1 mode, the zone size must be a power of 2. Check this not only when the zone size is specified during modprobe, but also when creating a zoned null_blk device using configfs. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-11-12null_blk: Add zone_nr_conv to featuresDamien Le Moal
For a null_blk device with zoned mode enabled, the number of conventional zones can be configured through configfs with the zone_nr_conv parameter. Add this missing parameter in the features string. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-11-12null_blk: clean up report zonesChristoph Hellwig
Make the instance name match the method name and define the name to NULL instead of providing an inline stub, which is rather pointless for a method call. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-11-12null_blk: clean up the block device operationsChristoph Hellwig
Remove the pointless stub open and release methods, give the operations vector a slightly less confusing name, and use normal alignment for the assignment operators. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-10-17null_blk: return fixed zoned reads > write pointerAjay Joshi
A zoned block device maintains a write pointer within a zone, and reads beyond the write pointer are undefined. Fill data buffer returned above the write pointer with 0xFF. Signed-off-by: Ajay Joshi <ajay.joshi@wdc.com> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Matias Bjørling <matias.bjorling@wdc.com> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-10-07null_blk: Enable modifying 'submit_queues' after an instance has been configuredBart Van Assche
This patch makes it possible to test blk_mq_update_nr_hw_queues() from inside a VM. Cc: Christoph Hellwig <hch@infradead.org> Cc: Ming Lei <ming.lei@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-10-07null_blk: Improve nullb_device_##NAME##_store() readabilityBart Van Assche
Introduce a local variable to make the code easier to read. This patch does not change any functionality but makes the next patch in this series easier to read. Cc: Christoph Hellwig <hch@infradead.org> Cc: Ming Lei <ming.lei@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-16null_blk: format pr_* logs with pr_fmtAndré Almeida
Instead of writing "null_blk: " at the beginning of each pr_err/info/warn log message, format messages using pr_fmt() macro. Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: André Almeida <andrealmeid@collabora.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-16null_blk: match the type of parameter nr_devicesAndré Almeida
Since the variable nr_devices is an unsigned int, the module_param() should also use this type. Change the type so they can match. Fixes: f7c4ce890dd2 ("null_blk: validate the number of devices") Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: André Almeida <andrealmeid@collabora.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-16null_blk: do not fail the module load with zero devicesAndré Almeida
The module load should fail only if there is something wrong with the configuration or if an error prevents it to work properly. The module should be able to be loaded with (nr_device == 0), since it will not trigger errors or be in malfunction state. Preventing loading with zero devices also breaks applications that configures this module using configfs API. Remove the nr_device check to fix this. Fixes: f7c4ce890dd2 ("null_blk: validate the number of devices") Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: André Almeida <andrealmeid@collabora.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-11null_blk: validate the number of devicesAndré Almeida
A negative number of devices is nonsensical, so change the type to unsigned. If the number of devices is 0, it is impossible for userspace to interact with the module, so refuse loading the driver for that case. Signed-off-by: André Almeida <andrealmeid@collabora.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-11null_blk: fix module name at log messageAndré Almeida
The name of the module is "null_blk", not "null". Make `pr_info()` follow the pattern of `pr_err()` log messages. Signed-off-by: André Almeida <andrealmeid@collabora.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-09-05block: Set ELEVATOR_F_ZBD_SEQ_WRITE for nullblk zoned disksDamien Le Moal
Using the helper blk_queue_required_elevator_features(), set the elevator feature ELEVATOR_F_ZBD_SEQ_WRITE as required for the request queue of null_blk devices created with zoned mode enabled. This feature requirement can always be satisfied as the mq-deadline elevator is always selected for in-kernel compilation when CONFIG_BLK_DEV_ZONED (zoned block device support) is enabled. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-23null_blk: create a helper for req completionChaitanya Kulkarni
This patch creates a helper function for handling the request completion in the null_handle_cmd(). Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-23null_blk: create a helper for zoned devicesChaitanya Kulkarni
This patch creates a helper function for handling zoned block device operations. This patch also restructured the code for null_blk_zoned.c and uses the pattern to return blk_status_t and catch the error in the function null_handle_cmd() into cmd->error variable instead of setting it up in the deeper layer just like the way it is done for flush, badblocks and memory backed case in the null_handle_cmd(). We also move null_handle_zoned() to the null_blk_zoned.c to keep the zoned code separate. Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-23null_blk: create a helper for mem-backed opsChaitanya Kulkarni
This patch creates a helper for handling requests when null_blk is memory backed in the null_handle_cmd(). Although the helper is very simple right now, it makes the code flow consistent with the rest of code in the null_handle_cmd() and provides a uniform code structure for future code. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-23null_blk: create a helper for badblocksChaitanya Kulkarni
This patch creates a helper for handling badblocks code in the null_handle_cmd(). Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-23null_blk: create a helper for throttlingChaitanya Kulkarni
This patch creates a helper for handling throttling code in the null_handle_cmd(). Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-23null_blk: move duplicate code to callersChaitanya Kulkarni
This is a preparation patch which moves the duplicate code for sectors and nr_sectors calculations for bio vs request mode into their respective callers (null_queue_bio(), null_qeueue_req()). Now the core function only deals with the respective actions and commands instead of having to calculte the bio vs req operations and different sector related variables. We also move the flush command handling at the top which significantly simplifies the rest of the code. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-08-04null_blk: implement REQ_OP_ZONE_RESET_ALLChaitanya Kulkarni
This patch implements newly introduced zone reset all operation for null_blk driver. Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-06-29null_blk: fix type mismatch null_handle_cmd()Chaitanya Kulkarni
In null_handle_cmd() when device is configured as zoned, variable op is decalred as an int, where it is used to hold values of type REQ_OP_XXX which is of type enum req_opf. Change the type from int to enum req_opf. Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-06-20null_blk: remove duplicate 0 initializationChaitanya Kulkarni
In function null_add_dev() struct nullb *nullb member is allocated using kzalloc_node() which returns 0red memory. In function setup_queues() which is called from the null_add_dev(), on successful queue allocation we set the nullb->nr_queues = 0 which is not needed due to earlier use of kzalloc_node(). Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-06-15block: null_blk: fix race condition for null_del_devBob Liu
Dulicate call of null_del_dev() will trigger null pointer error like below. The reason is a race condition between nullb_device_power_store() and nullb_group_drop_item(). CPU#0 CPU#1 ---------------- ----------------- do_rmdir() >configfs_rmdir() >client_drop_item() >nullb_group_drop_item() nullb_device_power_store() >null_del_dev() >test_and_clear_bit(NULLB_DEV_FL_UP >null_del_dev() ^^^^^ Duplicated null_dev_dev() triger null pointer error >clear_bit(NULLB_DEV_FL_UP The fix could be keep the sequnce of clear NULLB_DEV_FL_UP and null_del_dev(). [ 698.613600] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 [ 698.613608] #PF error: [normal kernel read fault] [ 698.613611] PGD 0 P4D 0 [ 698.613619] Oops: 0000 [#1] SMP PTI [ 698.613627] CPU: 3 PID: 6382 Comm: rmdir Not tainted 5.0.0+ #35 [ 698.613631] Hardware name: LENOVO 20LJS2EV08/20LJS2EV08, BIOS R0SET33W (1.17 ) 07/18/2018 [ 698.613644] RIP: 0010:null_del_dev+0xc/0x110 [null_blk] [ 698.613649] Code: 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 0b eb 97 e8 47 bb 2a e8 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 54 53 <8b> 77 18 48 89 fb 4c 8b 27 48 c7 c7 40 57 1e c1 e8 bf c7 cb e8 48 [ 698.613654] RSP: 0018:ffffb887888bfde0 EFLAGS: 00010286 [ 698.613659] RAX: 0000000000000000 RBX: ffff9d436d92bc00 RCX: ffff9d43a9184681 [ 698.613663] RDX: ffffffffc11e5c30 RSI: 0000000068be6540 RDI: 0000000000000000 [ 698.613667] RBP: ffffb887888bfdf0 R08: 0000000000000001 R09: 0000000000000000 [ 698.613671] R10: ffffb887888bfdd8 R11: 0000000000000f16 R12: ffff9d436d92bc08 [ 698.613675] R13: ffff9d436d94e630 R14: ffffffffc11e5088 R15: ffffffffc11e5000 [ 698.613680] FS: 00007faa68be6540(0000) GS:ffff9d43d14c0000(0000) knlGS:0000000000000000 [ 698.613685] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 698.613689] CR2: 0000000000000018 CR3: 000000042f70c002 CR4: 00000000003606e0 [ 698.613693] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 698.613697] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 698.613700] Call Trace: [ 698.613712] nullb_group_drop_item+0x50/0x70 [null_blk] [ 698.613722] client_drop_item+0x29/0x40 [ 698.613728] configfs_rmdir+0x1ed/0x300 [ 698.613738] vfs_rmdir+0xb2/0x130 [ 698.613743] do_rmdir+0x1c7/0x1e0 [ 698.613750] __x64_sys_rmdir+0x17/0x20 [ 698.613759] do_syscall_64+0x5a/0x110 [ 698.613768] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Signed-off-by: Bob Liu <bob.liu@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-05-21treewide: Add SPDX license identifier for more missed filesThomas Gleixner
Add SPDX license identifiers to all files which: - Have no license information of any form - Have MODULE_LICENCE("GPL*") inside which was used in the initial scan/conversion to ignore the file These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-06null_blk: prevent crash from bad home_node valueJohn Pittman
At module load, if the selected home_node value is greater than the available numa nodes, the system will crash in __alloc_pages_nodemask() due to a bad paging request. Prevent this user error crash by detecting the bad value, logging an error, and setting g_home_node back to the default of NUMA_NO_NODE. Signed-off-by: John Pittman <jpittman@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-02-28null_blk: fix checking for REQ_FUAHeinz Mauelshagen
null_handle_bio() erroneously uses the bio_op macro which masks respective request flag bits including REQ_FUA out thus failing the check. Fix by checking bio->bi_opf directly. Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-02-09block: kill QUEUE_FLAG_FLUSH_NQJens Axboe
We have various helpers for setting/clearing this flag, and also a helper to check if the queue supports queueable flushes or not. But nobody uses them anymore, kill it with fire. Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-11-15block: remove the lock argument to blk_alloc_queue_nodeChristoph Hellwig
With the legacy request path gone there is no real need to override the queue_lock. Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-11-10null_blk: remove unused nullb deviceJens Axboe
The compiler rightfully complains: drivers/block/null_blk_main.c: In function ‘null_complete_rq’: drivers/block/null_blk_main.c:647:16: warning: unused variable ‘nullb’ [-Wunused-variable] struct nullb *nullb = rq->q->queuedata; ^~~~~ Fixes: 49f6613632f9 ("nullb: remove leftover legacy request code") Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-11-10nullb: remove leftover legacy request codeChristoph Hellwig
null_softirq_done_fn is only used for the blk-mq path, so remove the other branch. Also rename the function to better match the method name. Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-11-07null_blk: Add conventional zone configuration for zoned supportMasato Suzuki
Allow the creation of conventional zones by adding the zone_nr_conv configuration attribute. This new attribute is used only for zoned devices and indicates the number of conventional zones to create. The default value is 0. Since host-managed zoned block devices must always have at least one sequential zone, if the value of zone_nr_conv is larger than or equal to the total number of zones of the device nr_zones, zone_nr_conv is automatically changed to nr_zones - 1. Reviewed-by: Matias Bjorling <matias.bjorling@wdc.com> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Masato Suzuki <masato.suzuki@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-10-25block: Introduce blk_revalidate_disk_zones()Damien Le Moal
Drivers exposing zoned block devices have to initialize and maintain correctness (i.e. revalidate) of the device zone bitmaps attached to the device request queue (seq_zones_bitmap and seq_zones_wlock). To simplify coding this, introduce a generic helper function blk_revalidate_disk_zones() suitable for most (and likely all) cases. This new function always update the seq_zones_bitmap and seq_zones_wlock bitmaps as well as the queue nr_zones field when called for a disk using a request based queue. For a disk using a BIO based queue, only the number of zones is updated since these queues do not have schedulers and so do not need the zone bitmaps. With this change, the zone bitmap initialization code in sd_zbc.c can be replaced with a call to this function in sd_zbc_read_zones(), which is called from the disk revalidate block operation method. A call to blk_revalidate_disk_zones() is also added to the null_blk driver for devices created with the zoned mode enabled. Finally, to ensure that zoned devices created with dm-linear or dm-flakey expose the correct number of zones through sysfs, a call to blk_revalidate_disk_zones() is added to dm_table_set_restrictions(). The zone bitmaps allocated and initialized with blk_revalidate_disk_zones() are freed automatically from __blk_release_queue() using the block internal function blk_queue_free_zone_bitmaps(). Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-10-25block: add a report_zones methodChristoph Hellwig
Dispatching a report zones command through the request queue is a major pain due to the command reply payload rewriting necessary. Given that blkdev_report_zones() is executing everything synchronously, implement report zones as a block device file operation instead, allowing major simplification of the code in many places. sd, null-blk, dm-linear and dm-flakey being the only block device drivers supporting exposing zoned block devices, these drivers are modified to provide the device side implementation of the report_zones() block device file operation. For device mappers, a new report_zones() target type operation is defined so that the upper block layer calls blkdev_report_zones() can be propagated down to the underlying devices of the dm targets. Implementation for this new operation is added to the dm-linear and dm-flakey targets. Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Christoph Hellwig <hch@lst.de> [Damien] * Changed method block_device argument to gendisk * Various bug fixes and improvements * Added support for null_blk, dm-linear and dm-flakey. Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-10-15null_blk: remove set but not used variable 'q'YueHaibing
Fixes gcc '-Wunused-but-set-variable' warning: drivers/block/null_blk_main.c: In function 'end_cmd': drivers/block/null_blk_main.c:609:24: warning: variable 'q' set but not used [-Wunused-but-set-variable] It not used any more after commit e50b1e327aeb ("null_blk: remove legacy IO path") Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-10-14null_blk: remove legacy IO pathJens Axboe
We're planning on removing this code completely, kill the old path. Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-09-12null_blk: fix zoned support for non-rq based operationJens Axboe
The supported added for zones in null_blk seem to assume that only rq based operation is possible. But this depends on the queue_mode setting, if this is set to 0, then cmd->bio is what we need to be operating on. Right now any attempt to load null_blk with queue_mode=0 will insta-crash, since cmd->rq is NULL and null_handle_cmd() assumes it to always be set. Make the zoned code deal with bio's instead, or pass in the appropriate sector/nr_sectors instead. Fixes: ca4b2a011948 ("null_blk: add zone support") Tested-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-08-09null_blk: add lock drop/acquire annotationJens Axboe
sparse complains: drivers/block/null_blk_main.c:816:24: sparse: context imbalance in 'null_insert_page' - unexpected unlock Fix it by adding the necessary annotations to the function. Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-07-24block: Rename the null_blk_mod kernel module back into null_blkBart Van Assche
Commit ca4b2a011948 ("null_blk: add zone support") breaks several blktests scripts because it renamed the null_blk kernel module into null_blk_mod. Hence rename null_blk_mod back into null_blk. Fixes: ca4b2a011948 ("null_blk: add zone support") Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Matias Bjorling <matias.bjorling@wdc.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Ming Lei <ming.lei@redhat.com> Cc: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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