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| author | Kyle Evans <kevans@FreeBSD.org> | 2019-09-01 00:33:16 +0000 |
|---|---|---|
| committer | Kyle Evans <kevans@FreeBSD.org> | 2019-09-01 00:33:16 +0000 |
| commit | 32287ea72b867e80b8c46ec39332bd9ce520c4e4 (patch) | |
| tree | 1a862e6670da5798fc7ae87fca6d38da438389b0 /sys/kern/uipc_shm.c | |
| parent | c96574f39c1c5579da46aa7d1ce0751ffd8111c9 (diff) | |
| download | src-32287ea72b867e80b8c46ec39332bd9ce520c4e4.tar.gz src-32287ea72b867e80b8c46ec39332bd9ce520c4e4.zip | |
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.
Notes
Notes:
svn path=/head/; revision=351650
Diffstat (limited to 'sys/kern/uipc_shm.c')
| -rw-r--r-- | sys/kern/uipc_shm.c | 2 |
1 files changed, 1 insertions, 1 deletions
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; |