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libzfs: fallback VDEV_UPATH to VDEV_PATH for non-DM devices

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When zfs_get_underlying_path() returns NULL for a non-DM device (e.g.
NVMe), the zfs_prepare_disk script was getting an empty VDEV_UPATH.  Per
the man page, VDEV_UPATH should fall back to VDEV_PATH when there is no
underlying path.

Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: MISAPOR LAB <[email protected]>
Closes #18439
Closes #18802
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Kili authored and GitHub committed 2026-07-16 09:45:46 -07:00
1 parent 0fa5d5792f
commit fb5fdefd86
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lib/libzfs/libzfs_util.c
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@@ -2405,6 +2405,8 @@ zpool_prepare_disk(zpool_handle_t *zhp, nvlist_t *vdev_nv,
&enc_sysfs_path);
upath = zfs_get_underlying_path(path);
if (upath == NULL && path != NULL)
upath = strdup(path);
pool_name = zhp ? zpool_get_name(zhp) : NULL;
env = zpool_vdev_script_alloc_env(pool_name, path, upath,