From 32287ea72b867e80b8c46ec39332bd9ce520c4e4 Mon Sep 17 00:00:00 2001 From: Kyle Evans Date: Sun, 1 Sep 2019 00:33:16 +0000 Subject: posixshm: switch to OBJT_SWAP in advance of other changes Future changes to posixshm will start tracking writeable mappings in order to support file sealing. Tracking writeable mappings for an OBJT_DEFAULT object is complicated as it may be swapped out and converted to an OBJT_SWAP. One may generically add this tracking for vm_object, but this is difficult to do without increasing memory footprint of vm_object and blowing up memory usage by a significant amount. On the other hand, the swap pager can be expanded to track writeable mappings without increasing vm_object size. This change is currently in D21456. Switch over to OBJT_SWAP in advance of the other changes to the swap pager and posixshm. --- sys/kern/uipc_shm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'sys/kern/uipc_shm.c') diff --git a/sys/kern/uipc_shm.c b/sys/kern/uipc_shm.c index 3980453b1366..38065dee7cb0 100644 --- a/sys/kern/uipc_shm.c +++ b/sys/kern/uipc_shm.c @@ -549,7 +549,7 @@ shm_alloc(struct ucred *ucred, mode_t mode) shmfd->shm_uid = ucred->cr_uid; shmfd->shm_gid = ucred->cr_gid; shmfd->shm_mode = mode; - shmfd->shm_object = vm_pager_allocate(OBJT_DEFAULT, NULL, + shmfd->shm_object = vm_pager_allocate(OBJT_SWAP, NULL, shmfd->shm_size, VM_PROT_DEFAULT, 0, ucred); KASSERT(shmfd->shm_object != NULL, ("shm_create: vm_pager_allocate")); shmfd->shm_object->pg_color = 0; -- cgit v1.2.3