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vm_pager: add pgo_set_writeable_dirty method

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specialized for swap and vnode pagers, and used to implement
vm_object_set_writeable_dirty().

Reviewed by:	markj
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D30070
This commit is contained in:
Konstantin Belousov 2021-05-01 03:14:48 +03:00
parent ee4211bca6
commit 180bcaa46c
6 changed files with 25 additions and 7 deletions
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9
sys/vm/swap_pager.c
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@ -433,6 +433,7 @@ static void swap_pager_update_writecount(vm_object_t object,
vm_offset_t start, vm_offset_t end);
static void swap_pager_release_writecount(vm_object_t object,
vm_offset_t start, vm_offset_t end);
static void swap_pager_set_writeable_dirty(vm_object_t object);
struct pagerops swappagerops = {
.pgo_init = swap_pager_init, /* early system initialization of pager */
@ -445,6 +446,7 @@ struct pagerops swappagerops = {
.pgo_pageunswapped = swap_pager_unswapped, /* remove swap related to page */
.pgo_update_writecount = swap_pager_update_writecount,
.pgo_release_writecount = swap_pager_release_writecount,
.pgo_set_writeable_dirty = swap_pager_set_writeable_dirty,
};
/*
@ -3123,3 +3125,10 @@ swap_pager_release_writecount(vm_object_t object, vm_offset_t start,
object->un_pager.swp.writemappings -= (vm_ooffset_t)end - start;
VM_OBJECT_WUNLOCK(object);
}
static void
swap_pager_set_writeable_dirty(vm_object_t object)
{
if ((object->flags & OBJ_TMPFS_NODE) != 0)
vm_object_set_writeable_dirty_(object);
}

7
sys/vm/vm_object.c
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@ -2332,13 +2332,8 @@ vm_object_coalesce(vm_object_t prev_object, vm_ooffset_t prev_offset,
}
void
vm_object_set_writeable_dirty(vm_object_t object)
vm_object_set_writeable_dirty_(vm_object_t object)
{
/* Only set for vnodes & tmpfs */
if (object->type != OBJT_VNODE &&
(object->flags & OBJ_TMPFS_NODE) == 0)
return;
atomic_add_int(&object->generation, 1);
}

1
sys/vm/vm_object.h
View File

@ -378,6 +378,7 @@ void vm_object_deallocate (vm_object_t);
void vm_object_destroy (vm_object_t);
void vm_object_terminate (vm_object_t);
void vm_object_set_writeable_dirty (vm_object_t);
void vm_object_set_writeable_dirty_(vm_object_t object);
void vm_object_init (void);
int vm_object_kvme_type(vm_object_t object, struct vnode **vpp);
void vm_object_madvise(vm_object_t, vm_pindex_t, vm_pindex_t, int);

11
sys/vm/vm_pager.c
View File

@ -497,3 +497,14 @@ pbrelbo(struct buf *bp)
bp->b_bufobj = NULL;
bp->b_flags &= ~B_PAGING;
}
void
vm_object_set_writeable_dirty(vm_object_t object)
{
pgo_set_writeable_dirty_t *method;
method = pagertab[object->type]->pgo_set_writeable_dirty;
if (method != NULL)
method(object);
}

3
sys/vm/vm_pager.h
View File

@ -62,6 +62,7 @@ typedef int pgo_populate_t(vm_object_t, vm_pindex_t, int, vm_prot_t,
vm_pindex_t *, vm_pindex_t *);
typedef void pgo_pageunswapped_t(vm_page_t);
typedef void pgo_writecount_t(vm_object_t, vm_offset_t, vm_offset_t);
typedef void pgo_set_writeable_dirty_t(vm_object_t);
struct pagerops {
pgo_init_t *pgo_init; /* Initialize pager. */
@ -73,9 +74,9 @@ struct pagerops {
pgo_haspage_t *pgo_haspage; /* Query page. */
pgo_populate_t *pgo_populate; /* Bulk spec pagein. */
pgo_pageunswapped_t *pgo_pageunswapped;
/* Operations for specialized writecount handling */
pgo_writecount_t *pgo_update_writecount;
pgo_writecount_t *pgo_release_writecount;
pgo_set_writeable_dirty_t *pgo_set_writeable_dirty;
};
extern struct pagerops defaultpagerops;

1
sys/vm/vnode_pager.c
View File

@ -115,6 +115,7 @@ struct pagerops vnodepagerops = {
.pgo_haspage = vnode_pager_haspage,
.pgo_update_writecount = vnode_pager_update_writecount,
.pgo_release_writecount = vnode_pager_release_writecount,
.pgo_set_writeable_dirty = vm_object_set_writeable_dirty_,
};
static struct domainset *vnode_domainset = NULL;