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vop_stdadvise(): restore correct handling of length == 0

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(cherry picked from commit 79eba754be)
This commit is contained in:
Konstantin Belousov 2024-09-03 07:20:40 +03:00
parent 9f319352d7
commit e8b9bd97e3
1 changed files with 7 additions and 7 deletions
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14
sys/kern/vfs_default.c
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@ -1066,8 +1066,8 @@ vop_stdadvise(struct vop_advise_args *ap)
{
struct vnode *vp;
struct bufobj *bo;
uintmax_t bstart, bend;
daddr_t startn, endn;
off_t bstart, bend, start, end;
int bsize, error;
vp = ap->a_vp;
@ -1099,7 +1099,8 @@ vop_stdadvise(struct vop_advise_args *ap)
*/
bsize = vp->v_bufobj.bo_bsize;
bstart = rounddown(ap->a_start, bsize);
bend = roundup(ap->a_end, bsize);
bend = ap->a_end;
bend = roundup(bend, bsize);
/*
* Deactivate pages in the specified range from the backing VM
@ -1108,18 +1109,17 @@ vop_stdadvise(struct vop_advise_args *ap)
* below.
*/
if (vp->v_object != NULL) {
start = trunc_page(bstart);
end = round_page(bend);
VM_OBJECT_RLOCK(vp->v_object);
vm_object_page_noreuse(vp->v_object, OFF_TO_IDX(start),
OFF_TO_IDX(end));
vm_object_page_noreuse(vp->v_object,
OFF_TO_IDX(trunc_page(bstart)),
OFF_TO_IDX(round_page(bend)));
VM_OBJECT_RUNLOCK(vp->v_object);
}
bo = &vp->v_bufobj;
BO_RLOCK(bo);
startn = bstart / bsize;
endn = bend / bsize;
BO_RLOCK(bo);
error = bnoreuselist(&bo->bo_clean, bo, startn, endn);
if (error == 0)
error = bnoreuselist(&bo->bo_dirty, bo, startn, endn);