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diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
--- a/sys/kern/vfs_vnops.c
+++ b/sys/kern/vfs_vnops.c
@@ -3046,6 +3046,7 @@
off_t *outoffp, size_t *lenp, unsigned int flags, struct ucred *incred,
struct ucred *outcred, struct thread *fsize_td)
{
+ struct mount *inmp, *outmp;
int error;
size_t len;
uint64_t uval;
@@ -3075,15 +3076,17 @@
if (len == 0)
goto out;
+ inmp = invp->v_mount;
+ outmp = outvp->v_mount;
+
/*
* If the two vnodes are for the same file system type, call
* VOP_COPY_FILE_RANGE(), otherwise call vn_generic_copy_file_range()
* which can handle copies across multiple file system types.
*/
*lenp = len;
- if (invp->v_mount == outvp->v_mount ||
- strcmp(invp->v_mount->mnt_vfc->vfc_name,
- outvp->v_mount->mnt_vfc->vfc_name) == 0)
+ if (inmp == outmp || strcmp(inmp->mnt_vfc->vfc_name,
+ outmp->mnt_vfc->vfc_name) == 0)
error = VOP_COPY_FILE_RANGE(invp, inoffp, outvp, outoffp,
lenp, flags, incred, outcred, fsize_td);
else

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