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Add V_VMIO flag for vinvalbuf(9) to indicate that the flush request

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was issued during VM-initiated i/o (pageout), so that the function
does not try to flush or remove pages or wait for the vm object
paging-in-progress counter.

Reviewed by:	markj
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
X-Differential revision:	https://reviews.freebsd.org/D10241
This commit is contained in:
Konstantin Belousov 2017-04-05 16:57:53 +00:00
parent 4af540d197
commit 0226f65940
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=316528
2 changed files with 11 additions and 8 deletions
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18
sys/kern/vfs_subr.c
View File

@ -1673,13 +1673,15 @@ bufobj_invalbuf(struct bufobj *bo, int flags, int slpflag, int slptimeo)
*/
do {
bufobj_wwait(bo, 0, 0);
BO_UNLOCK(bo);
if (bo->bo_object != NULL) {
VM_OBJECT_WLOCK(bo->bo_object);
vm_object_pip_wait(bo->bo_object, "bovlbx");
VM_OBJECT_WUNLOCK(bo->bo_object);
if ((flags & V_VMIO) == 0) {
BO_UNLOCK(bo);
if (bo->bo_object != NULL) {
VM_OBJECT_WLOCK(bo->bo_object);
vm_object_pip_wait(bo->bo_object, "bovlbx");
VM_OBJECT_WUNLOCK(bo->bo_object);
}
BO_LOCK(bo);
}
BO_LOCK(bo);
} while (bo->bo_numoutput > 0);
BO_UNLOCK(bo);
@ -1687,7 +1689,7 @@ bufobj_invalbuf(struct bufobj *bo, int flags, int slpflag, int slptimeo)
* Destroy the copy in the VM cache, too.
*/
if (bo->bo_object != NULL &&
(flags & (V_ALT | V_NORMAL | V_CLEANONLY)) == 0) {
(flags & (V_ALT | V_NORMAL | V_CLEANONLY | V_VMIO)) == 0) {
VM_OBJECT_WLOCK(bo->bo_object);
vm_object_page_remove(bo->bo_object, 0, 0, (flags & V_SAVE) ?
OBJPR_CLEANONLY : 0);
@ -1696,7 +1698,7 @@ bufobj_invalbuf(struct bufobj *bo, int flags, int slpflag, int slptimeo)
#ifdef INVARIANTS
BO_LOCK(bo);
if ((flags & (V_ALT | V_NORMAL | V_CLEANONLY)) == 0 &&
if ((flags & (V_ALT | V_NORMAL | V_CLEANONLY | V_VMIO)) == 0 &&
(bo->bo_dirty.bv_cnt > 0 || bo->bo_clean.bv_cnt > 0))
panic("vinvalbuf: flush failed");
BO_UNLOCK(bo);

1
sys/sys/vnode.h
View File

@ -402,6 +402,7 @@ extern int vttoif_tab[];
#define V_ALT 0x0002 /* vinvalbuf: invalidate only alternate bufs */
#define V_NORMAL 0x0004 /* vinvalbuf: invalidate only regular bufs */
#define V_CLEANONLY 0x0008 /* vinvalbuf: invalidate only clean bufs */
#define V_VMIO 0x0010 /* vinvalbuf: called during pageout */
#define REVOKEALL 0x0001 /* vop_revoke: revoke all aliases */
#define V_WAIT 0x0001 /* vn_start_write: sleep for suspend */
#define V_NOWAIT 0x0002 /* vn_start_write: don't sleep for suspend */