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[zfs-2.2.8] Revert "vdev_disk: default to classic submission for 2.2.x"

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This reverts commit eebf00bee9.

Classic mode is causing assertions on both this branch and master:

VERIFY3(page_count(page) > 0) failed (0 > 0)
PANIC at abd_os.c:1069:bio_map()

Signed-off-by: Tony Hutter <hutter2@llnl.gov>
This commit is contained in:
Tony Hutter
2025-05-29 15:27:39 -07:00
parent 000236716a
commit c81e37f15d
2 changed files with 12 additions and 27 deletions
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module/os/linux/zfs/vdev_disk.c
+3 -5
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@@ -963,10 +963,8 @@ vdev_disk_io_rw(zio_t *zio)
/*
* This is the classic, battle-tested BIO submission code. Until we're totally
* sure that the new code is safe and correct in all cases, this will remain
* available.
*
* It is enabled by setting zfs_vdev_disk_classic=1 at module load time. It is
* enabled (=1) by default since 2.2.4, and disabled by default (=0) on master.
* available and can be enabled by setting zfs_vdev_disk_classic=1 at module
* load time.
*
* These functions have been renamed to vdev_classic_* to make it clear what
* they belong to, but their implementations are unchanged.
@@ -1516,7 +1514,7 @@ vdev_disk_rele(vdev_t *vd)
* BIO submission method. See comment above about vdev_classic.
* Set zfs_vdev_disk_classic=0 for new, =1 for classic
*/
static uint_t zfs_vdev_disk_classic = 1; /* default classic */
static uint_t zfs_vdev_disk_classic = 0; /* default new */
/* Set submission function from module parameter */
static int