diff options
| author | kib <kib@FreeBSD.org> | 2010-08-06 09:42:15 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2010-08-06 09:42:15 +0000 |
| commit | ba7ee96f4acc27c8c70a4af6c81be42c4856619f (patch) | |
| tree | 7da521a717547b550e58c94609d3078b5dd9e826 /sys/vm/vm_mmap.c | |
| parent | c3d4f0835cad384499298be886c0a8afc90d5822 (diff) | |
| download | FreeBSD-src-ba7ee96f4acc27c8c70a4af6c81be42c4856619f.zip FreeBSD-src-ba7ee96f4acc27c8c70a4af6c81be42c4856619f.tar.gz | |
Add new make_dev_p(9) flag MAKEDEV_ETERNAL to inform devfs that created
cdev will never be destroyed. Propagate the flag to devfs vnodes as
VV_ETERNVALDEV. Use the flags to avoid acquiring devmtx and taking a
thread reference on such nodes.
In collaboration with: pho
MFC after: 1 month
Diffstat (limited to 'sys/vm/vm_mmap.c')
| -rw-r--r-- | sys/vm/vm_mmap.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/sys/vm/vm_mmap.c b/sys/vm/vm_mmap.c index 999a481..bd9f98f 100644 --- a/sys/vm/vm_mmap.c +++ b/sys/vm/vm_mmap.c @@ -1292,15 +1292,15 @@ vm_mmap_cdev(struct thread *td, vm_size_t objsize, { vm_object_t obj; struct cdevsw *dsw; - int error, flags; + int error, flags, ref; flags = *flagsp; - dsw = dev_refthread(cdev); + dsw = dev_refthread(cdev, &ref); if (dsw == NULL) return (ENXIO); if (dsw->d_flags & D_MMAP_ANON) { - dev_relthread(cdev); + dev_relthread(cdev, ref); *maxprotp = VM_PROT_ALL; *flagsp |= MAP_ANON; return (0); @@ -1310,11 +1310,11 @@ vm_mmap_cdev(struct thread *td, vm_size_t objsize, */ if ((*maxprotp & VM_PROT_WRITE) == 0 && (prot & PROT_WRITE) != 0) { - dev_relthread(cdev); + dev_relthread(cdev, ref); return (EACCES); } if (flags & (MAP_PRIVATE|MAP_COPY)) { - dev_relthread(cdev); + dev_relthread(cdev, ref); return (EINVAL); } /* @@ -1324,7 +1324,7 @@ vm_mmap_cdev(struct thread *td, vm_size_t objsize, #ifdef MAC_XXX error = mac_cdev_check_mmap(td->td_ucred, cdev, prot); if (error != 0) { - dev_relthread(cdev); + dev_relthread(cdev, ref); return (error); } #endif @@ -1338,7 +1338,7 @@ vm_mmap_cdev(struct thread *td, vm_size_t objsize, * XXX assumes VM_PROT_* == PROT_* */ error = dsw->d_mmap_single(cdev, foff, objsize, objp, (int)prot); - dev_relthread(cdev); + dev_relthread(cdev, ref); if (error != ENODEV) return (error); obj = vm_pager_allocate(OBJT_DEVICE, cdev, objsize, prot, *foff, |
