Date: Mon, 20 Dec 2021 00:38:07 GMT From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 45786883b076 - stable/13 - swapoff(2): add a SWAPOFF_FORCE flag Message-ID: <202112200038.1BK0c7ba059876@gitrepo.freebsd.org>
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The branch stable/13 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=45786883b0761dcd13495be67d3e7959b0657609 commit 45786883b0761dcd13495be67d3e7959b0657609 Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2021-11-29 16:28:19 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2021-12-20 00:29:11 +0000 swapoff(2): add a SWAPOFF_FORCE flag (cherry picked from commit e8dc2ba29c62f3be2bdeb1a09321d73644a84475) --- sys/vm/swap_pager.c | 12 ++++++------ sys/vm/swap_pager.h | 2 ++ 2 files changed, 8 insertions(+), 6 deletions(-) diff --git a/sys/vm/swap_pager.c b/sys/vm/swap_pager.c index 17722f314650..9238ecd5645d 100644 --- a/sys/vm/swap_pager.c +++ b/sys/vm/swap_pager.c @@ -470,7 +470,7 @@ static void swp_pager_free_empty_swblk(vm_object_t, struct swblk *sb); static int swapongeom(struct vnode *); static int swaponvp(struct thread *, struct vnode *, u_long); static int swapoff_one(struct swdevt *sp, struct ucred *cred, - bool ignore_check); + u_int flags); /* * Swap bitmap functions @@ -2505,7 +2505,7 @@ sys_swapoff(struct thread *td, struct swapoff_args *uap) error = copyin(uap->name, &sa, sizeof(sa)); if (error != 0) return (error); - if (sa.flags != 0) + if ((sa.flags & ~(SWAPOFF_FORCE)) != 0) return (EINVAL); break; default: @@ -2534,14 +2534,14 @@ sys_swapoff(struct thread *td, struct swapoff_args *uap) error = EINVAL; goto done; } - error = swapoff_one(sp, td->td_ucred, false); + error = swapoff_one(sp, td->td_ucred, sa.flags); done: sx_xunlock(&swdev_syscall_lock); return (error); } static int -swapoff_one(struct swdevt *sp, struct ucred *cred, bool ignore_check) +swapoff_one(struct swdevt *sp, struct ucred *cred, u_int flags) { u_long nblks; #ifdef MAC @@ -2571,7 +2571,7 @@ swapoff_one(struct swdevt *sp, struct ucred *cred, bool ignore_check) * means that we can lose swap data when filesystems go away, * which is arguably worse. */ - if (!ignore_check && + if ((flags & SWAPOFF_FORCE) == 0 && vm_free_count() + swap_pager_avail < nblks + nswap_lowat) return (ENOMEM); @@ -2622,7 +2622,7 @@ swapoff_all(void) devname = devtoname(sp->sw_vp->v_rdev); else devname = "[file]"; - error = swapoff_one(sp, thread0.td_ucred, true); + error = swapoff_one(sp, thread0.td_ucred, SWAPOFF_FORCE); if (error != 0) { printf("Cannot remove swap device %s (error=%d), " "skipping.\n", devname, error); diff --git a/sys/vm/swap_pager.h b/sys/vm/swap_pager.h index ed0abdee7d3f..b78ac6a7c698 100644 --- a/sys/vm/swap_pager.h +++ b/sys/vm/swap_pager.h @@ -76,6 +76,8 @@ struct swapoff_new_args { uintptr_t pad1[8]; }; +#define SWAPOFF_FORCE 0x00000001 + #ifdef _KERNEL extern int swap_pager_avail;
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