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support msync() system call. refs #382

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Msync(2) of this version writes only the pages which the calling process
modified. Modifications of the other processes are not written.
This commit is contained in:
NAKAMURA Gou
2014-07-09 14:19:26 +09:00
parent 6485578a7f
commit 16af976a71
8 changed files with 356 additions and 0 deletions
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11
kernel/include/memobj.h
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@ -37,6 +37,7 @@ typedef void memobj_ref_func_t(struct memobj *obj);
typedef int memobj_get_page_func_t(struct memobj *obj, off_t off, int p2align, uintptr_t *physp);
typedef uintptr_t memobj_copy_page_func_t(struct memobj *obj, uintptr_t orgphys, int p2align);
typedef int memobj_flush_page_func_t(struct memobj *obj, uintptr_t phys, size_t pgsize);
typedef int memobj_invalidate_page_func_t(struct memobj *obj, uintptr_t phys, size_t pgsize);
struct memobj_ops {
memobj_release_func_t * release;
@ -44,6 +45,7 @@ struct memobj_ops {
memobj_get_page_func_t * get_page;
memobj_copy_page_func_t * copy_page;
memobj_flush_page_func_t * flush_page;
memobj_invalidate_page_func_t * invalidate_page;
};
static inline void memobj_release(struct memobj *obj)
@ -86,6 +88,15 @@ static inline int memobj_flush_page(struct memobj *obj, uintptr_t phys, size_t p
return 0;
}
static inline int memobj_invalidate_page(struct memobj *obj, uintptr_t phys,
size_t pgsize)
{
if (obj->ops->invalidate_page) {
return (*obj->ops->invalidate_page)(obj, phys, pgsize);
}
return 0;
}
static inline void memobj_lock(struct memobj *obj)
{
ihk_mc_spinlock_lock_noirq(&obj->lock);

7
kernel/include/mman.h
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@ -69,4 +69,11 @@
#define MREMAP_MAYMOVE 0x01
#define MREMAP_FIXED 0x02
/*
* for msync()
*/
#define MS_ASYNC 0x01
#define MS_INVALIDATE 0x02
#define MS_SYNC 0x04
#endif /* HEADER_MMAN_H */

4
kernel/include/process.h
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@ -405,6 +405,10 @@ int change_prot_process_memory_range(
unsigned long newflag);
int remap_process_memory_range(struct process_vm *vm, struct vm_range *range,
uintptr_t start, uintptr_t end, off_t off);
int sync_process_memory_range(struct process_vm *vm, struct vm_range *range,
uintptr_t start, uintptr_t end);
int invalidate_process_memory_range(struct process_vm *vm,
struct vm_range *range, uintptr_t start, uintptr_t end);
struct vm_range *lookup_process_memory_range(
struct process_vm *vm, uintptr_t start, uintptr_t end);
struct vm_range *next_process_memory_range(