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vfs_subr: optimize inval_buf_range

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Use a pctrie_lookup to avoid walking over low out-of-range buf list
entries, and an early break to avoid the high out-of-range
entries. Avoid writing almost identical loops for the dirty and clean
lists.

Because pctries are built for unsigned keys, and these are signed
values, handle the wraparound problem the same way that bnoreuselist()
does.

Reviewed by:	kib
Tested by:	pho
Differential Revision:	https://reviews.freebsd.org/D46963
This commit is contained in:
Doug Moore 2024-10-14 12:07:59 -05:00
parent 7763b194d8
commit 2c8caa4b39
1 changed files with 18 additions and 32 deletions
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48
sys/kern/vfs_subr.c
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@ -2616,17 +2616,25 @@ static int
v_inval_buf_range_locked(struct vnode *vp, struct bufobj *bo,
daddr_t startlbn, daddr_t endlbn)
{
struct bufv *bv;
struct buf *bp, *nbp;
bool anyfreed;
uint8_t anyfreed;
bool clean;
ASSERT_VOP_LOCKED(vp, "v_inval_buf_range_locked");
ASSERT_BO_LOCKED(bo);
anyfreed = 1;
clean = true;
do {
anyfreed = false;
TAILQ_FOREACH_SAFE(bp, &bo->bo_clean.bv_hd, b_bobufs, nbp) {
if (bp->b_lblkno < startlbn || bp->b_lblkno >= endlbn)
bv = clean ? &bo->bo_clean : &bo->bo_dirty;
bp = BUF_PCTRIE_LOOKUP_GE(&bv->bv_root, startlbn);
if (bp == NULL || bp->b_lblkno >= endlbn ||
bp->b_lblkno < startlbn)
continue;
TAILQ_FOREACH_FROM_SAFE(bp, &bv->bv_hd, b_bobufs, nbp) {
if (bp->b_lblkno >= endlbn)
break;
if (BUF_LOCK(bp,
LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
BO_LOCKPTR(bo)) == ENOLCK) {
@ -2638,39 +2646,17 @@ v_inval_buf_range_locked(struct vnode *vp, struct bufobj *bo,
bp->b_flags |= B_INVAL | B_RELBUF;
bp->b_flags &= ~B_ASYNC;
brelse(bp);
anyfreed = true;
anyfreed = 2;
BO_LOCK(bo);
if (nbp != NULL &&
(((nbp->b_xflags & BX_VNCLEAN) == 0) ||
(((nbp->b_xflags &
(clean ? BX_VNCLEAN : BX_VNDIRTY)) == 0) ||
nbp->b_vp != vp ||
(nbp->b_flags & B_DELWRI) != 0))
(nbp->b_flags & B_DELWRI) == (clean? B_DELWRI: 0)))
return (EAGAIN);
}
TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
if (bp->b_lblkno < startlbn || bp->b_lblkno >= endlbn)
continue;
if (BUF_LOCK(bp,
LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
BO_LOCKPTR(bo)) == ENOLCK) {
BO_LOCK(bo);
return (EAGAIN);
}
bremfree(bp);
bp->b_flags |= B_INVAL | B_RELBUF;
bp->b_flags &= ~B_ASYNC;
brelse(bp);
anyfreed = true;
BO_LOCK(bo);
if (nbp != NULL &&
(((nbp->b_xflags & BX_VNDIRTY) == 0) ||
(nbp->b_vp != vp) ||
(nbp->b_flags & B_DELWRI) == 0))
return (EAGAIN);
}
} while (anyfreed);
} while (clean = !clean, anyfreed-- > 0);
return (0);
}