From c60df6a80179f45a64daeb47113b0a342461ef97 Mon Sep 17 00:00:00 2001 From: Ameer Hamza Date: Fri, 16 Aug 2024 02:29:50 +0500 Subject: [PATCH] linux/zvol_os: fix zvol queue limits initialization zvol queue limits initialization depends on `zv_volblocksize`, but it is initialized later, leading to several limits being initialized with incorrect values, including `max_discard_*` limits. This also causes `blkdiscard` command to consistently fail, as `blk_ioctl_discard` reads `bdev_max_discard_sectors()` limits as 0, leading to failure. The fix is straightforward: initialize `zv->zv_volblocksize` early, before setting the queue limits. This PR should fix `zvol/zvol_misc/zvol_misc_trim` failure on recent PRs, as the test case issues `blkdiscard` for a zvol. Additionally, `zvol_misc_trim` was recently enabled in `6c7d41a`, which is why the issue wasn't identified earlier. Reviewed-by: Brian Behlendorf Reviewed-by: Tony Hutter Signed-off-by: Ameer Hamza Closes #16454 --- module/os/linux/zfs/zvol_os.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/module/os/linux/zfs/zvol_os.c b/module/os/linux/zfs/zvol_os.c index fb4a2d8866..928a222f15 100644 --- a/module/os/linux/zfs/zvol_os.c +++ b/module/os/linux/zfs/zvol_os.c @@ -1343,7 +1343,7 @@ zvol_alloc_blk_mq(zvol_state_t *zv, zvol_queue_limits_t *limits) * request queue and generic disk structures for the block device. */ static zvol_state_t * -zvol_alloc(dev_t dev, const char *name) +zvol_alloc(dev_t dev, const char *name, uint64_t volblocksize) { zvol_state_t *zv; struct zvol_state_os *zso; @@ -1363,6 +1363,7 @@ zvol_alloc(dev_t dev, const char *name) zso = kmem_zalloc(sizeof (struct zvol_state_os), KM_SLEEP); zv->zv_zso = zso; zv->zv_volmode = volmode; + zv->zv_volblocksize = volblocksize; list_link_init(&zv->zv_next); mutex_init(&zv->zv_state_lock, NULL, MUTEX_DEFAULT, NULL); @@ -1649,7 +1650,8 @@ zvol_os_create_minor(const char *name) if (error) goto out_dmu_objset_disown; - zv = zvol_alloc(MKDEV(zvol_major, minor), name); + zv = zvol_alloc(MKDEV(zvol_major, minor), name, + doi->doi_data_block_size); if (zv == NULL) { error = SET_ERROR(EAGAIN); goto out_dmu_objset_disown; @@ -1659,7 +1661,6 @@ zvol_os_create_minor(const char *name) if (dmu_objset_is_snapshot(os)) zv->zv_flags |= ZVOL_RDONLY; - zv->zv_volblocksize = doi->doi_data_block_size; zv->zv_volsize = volsize; zv->zv_objset = os;