The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=6ddf41faa6f54738db9b3f313086974b6403d680
commit 6ddf41faa6f54738db9b3f313086974b6403d680 Author: Konstantin Belousov <[email protected]> AuthorDate: 2021-11-24 03:06:02 +0000 Commit: Konstantin Belousov <[email protected]> CommitDate: 2021-11-25 19:34:44 +0000 swapon: extend the region where the swap vnode is locked to cover VOP_GETATTR() call in sys_swapon(). Move locking from inside swapongeom() and swaponvp() into sys_swapon(). Reported by and tested by: peterj Reviewed by: markj MFC after: 1 week Differential revision: https://reviews.freebsd.org/D33119 --- sys/vm/swap_pager.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/sys/vm/swap_pager.c b/sys/vm/swap_pager.c index 1a44d699bc05..880e2a1894df 100644 --- a/sys/vm/swap_pager.c +++ b/sys/vm/swap_pager.c @@ -2366,8 +2366,8 @@ sys_swapon(struct thread *td, struct swapon_args *uap) goto done; } - NDINIT(&nd, LOOKUP, ISOPEN | FOLLOW | AUDITVNODE1, UIO_USERSPACE, - uap->name, td); + NDINIT(&nd, LOOKUP, ISOPEN | FOLLOW | LOCKLEAF | AUDITVNODE1, + UIO_USERSPACE, uap->name, td); error = namei(&nd); if (error) goto done; @@ -2387,8 +2387,10 @@ sys_swapon(struct thread *td, struct swapon_args *uap) error = swaponvp(td, vp, attr.va_size / DEV_BSIZE); } - if (error) - vrele(vp); + if (error != 0) + vput(vp); + else + VOP_UNLOCK(vp); done: sx_xunlock(&swdev_syscall_lock); return (error); @@ -3012,7 +3014,7 @@ swapongeom(struct vnode *vp) { int error; - vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); + ASSERT_VOP_ELOCKED(vp, "swapongeom"); if (vp->v_type != VCHR || VN_IS_DOOMED(vp)) { error = ENOENT; } else { @@ -3020,7 +3022,6 @@ swapongeom(struct vnode *vp) error = swapongeom_locked(vp->v_rdev, vp); g_topology_unlock(); } - VOP_UNLOCK(vp); return (error); } @@ -3071,6 +3072,7 @@ swaponvp(struct thread *td, struct vnode *vp, u_long nblks) struct swdevt *sp; int error; + ASSERT_VOP_ELOCKED(vp, "swaponvp"); if (nblks == 0) return (ENXIO); mtx_lock(&sw_dev_mtx); @@ -3082,14 +3084,12 @@ swaponvp(struct thread *td, struct vnode *vp, u_long nblks) } mtx_unlock(&sw_dev_mtx); - (void) vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); #ifdef MAC error = mac_system_check_swapon(td->td_ucred, vp); if (error == 0) #endif error = VOP_OPEN(vp, FREAD | FWRITE, td->td_ucred, td, NULL); - (void) VOP_UNLOCK(vp); - if (error) + if (error != 0) return (error); swaponsomething(vp, vp, nblks, swapdev_strategy, swapdev_close,
