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Code Issues Releases Activity

vm_map: add vm_map_find_locked(9)

Browse Source 
Reviewed by:	alc, markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D46678
This commit is contained in:
Konstantin Belousov 2024-09-15 09:29:28 +03:00
parent 420c984470
commit 0ecbb28ce3
2 changed files with 26 additions and 15 deletions
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39
sys/vm/vm_map.c
View File

@ -2117,9 +2117,24 @@ vm_map_find_aligned(vm_map_t map, vm_offset_t *addr, vm_size_t length,
*/
int
vm_map_find(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
vm_offset_t *addr, /* IN/OUT */
vm_size_t length, vm_offset_t max_addr, int find_space,
vm_prot_t prot, vm_prot_t max, int cow)
vm_offset_t *addr, /* IN/OUT */
vm_size_t length, vm_offset_t max_addr, int find_space,
vm_prot_t prot, vm_prot_t max, int cow)
{
int rv;
vm_map_lock(map);
rv = vm_map_find_locked(map, object, offset, addr, length, max_addr,
find_space, prot, max, cow);
vm_map_unlock(map);
return (rv);
}
int
vm_map_find_locked(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
vm_offset_t *addr, /* IN/OUT */
vm_size_t length, vm_offset_t max_addr, int find_space,
vm_prot_t prot, vm_prot_t max, int cow)
{
vm_offset_t alignment, curr_min_addr, min_addr;
int gap, pidx, rv, try;
@ -2127,7 +2142,7 @@ vm_map_find(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
KASSERT((cow & (MAP_STACK_GROWS_DOWN | MAP_STACK_GROWS_UP)) == 0 ||
object == NULL,
("vm_map_find: non-NULL backing object for stack"));
("non-NULL backing object for stack"));
MPASS((cow & MAP_REMAP) == 0 || (find_space == VMFS_NO_SPACE &&
(cow & (MAP_STACK_GROWS_DOWN | MAP_STACK_GROWS_UP)) == 0));
if (find_space == VMFS_OPTIMAL_SPACE && (object == NULL ||
@ -2150,7 +2165,6 @@ vm_map_find(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
(map->flags & MAP_ASLR_IGNSTART) != 0)
curr_min_addr = min_addr = vm_map_min(map);
try = 0;
vm_map_lock(map);
if (cluster) {
curr_min_addr = map->anon_loc;
if (curr_min_addr == 0)
@ -2235,8 +2249,7 @@ vm_map_find(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
MPASS(try == 1);
goto again;
}
rv = KERN_NO_SPACE;
goto done;
return (KERN_NO_SPACE);
}
}
@ -2250,16 +2263,14 @@ vm_map_find(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
try = 0;
goto again;
}
goto done;
return (rv);
}
} else if ((cow & MAP_REMAP) != 0) {
if (!vm_map_range_valid(map, *addr, *addr + length)) {
rv = KERN_INVALID_ADDRESS;
goto done;
}
if (!vm_map_range_valid(map, *addr, *addr + length))
return (KERN_INVALID_ADDRESS);
rv = vm_map_delete(map, *addr, *addr + length);
if (rv != KERN_SUCCESS)
goto done;
return (rv);
}
if ((cow & (MAP_STACK_GROWS_DOWN | MAP_STACK_GROWS_UP)) != 0) {
rv = vm_map_stack_locked(map, *addr, length, sgrowsiz, prot,
@ -2277,8 +2288,6 @@ vm_map_find(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
if (update_anon && rv == KERN_SUCCESS && (map->anon_loc == 0 ||
*addr < map->anon_loc))
map->anon_loc = *addr;
done:
vm_map_unlock(map);
return (rv);
}

2
sys/vm/vm_map.h
View File

@ -473,6 +473,8 @@ boolean_t vm_map_check_protection (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t
int vm_map_delete(vm_map_t, vm_offset_t, vm_offset_t);
int vm_map_find(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *, vm_size_t,
vm_offset_t, int, vm_prot_t, vm_prot_t, int);
int vm_map_find_locked(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *,
vm_size_t, vm_offset_t, int, vm_prot_t, vm_prot_t, int);
int vm_map_find_min(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *,
vm_size_t, vm_offset_t, vm_offset_t, int, vm_prot_t, vm_prot_t, int);
int vm_map_find_aligned(vm_map_t map, vm_offset_t *addr, vm_size_t length,