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zvol: Temporally disable blk-mq

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There was a report of zvol data loss (#15351) after enabling blk-mq on a
zvol backed with 16k physical block sized disks.  Out of an abundance of
caution, do not allow the user to enable blk-mq until we can look into
the issue.

Note that blk-mq was not enabled by default on zvols.  It was always
opt-in via the zvol_use_blk_mq module parameter.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Addresses: #15351
Closes #15378
This commit is contained in:
Tony Hutter
2023-10-10 08:57:48 -07:00
committed by GitHub
parent 28096c7c13
commit aefb6a2bd6
3 changed files with 1 additions and 70 deletions
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module/os/linux/zfs/zvol_os.c
-12
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@@ -1626,18 +1626,6 @@ MODULE_PARM_DESC(zvol_prefetch_bytes, "Prefetch N bytes at zvol start+end");
module_param(zvol_volmode, uint, 0644);
MODULE_PARM_DESC(zvol_volmode, "Default volmode property value");
#ifdef HAVE_BLK_MQ
module_param(zvol_blk_mq_queue_depth, uint, 0644);
MODULE_PARM_DESC(zvol_blk_mq_queue_depth, "Default blk-mq queue depth");
module_param(zvol_use_blk_mq, uint, 0644);
MODULE_PARM_DESC(zvol_use_blk_mq, "Use the blk-mq API for zvols");
module_param(zvol_blk_mq_blocks_per_thread, uint, 0644);
MODULE_PARM_DESC(zvol_blk_mq_blocks_per_thread,
"Process volblocksize blocks per thread");
#endif
#ifndef HAVE_BLKDEV_GET_ERESTARTSYS
module_param(zvol_open_timeout_ms, uint, 0644);
MODULE_PARM_DESC(zvol_open_timeout_ms, "Timeout for ZVOL open retries");