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McKenney" , Matthew Wilcox , Laurent Dufour , David Rientjes , Axel Rasmussen , Suren Baghdasaryan , Vlastimil Babka , Rik van Riel , Peter Zijlstra , Michel Lespinasse , Jerome Glisse , Minchan Kim , Joel Fernandes , Rom Lemarchand , Liam Howlett Subject: [PATCH v4 43/66] userfaultfd: Use maple tree iterator to iterate VMAs Thread-Topic: [PATCH v4 43/66] userfaultfd: Use maple tree iterator to iterate VMAs Thread-Index: AQHX5r/xxngSsnXavkytBhuaTJnW/g== Date: Wed, 1 Dec 2021 14:30:10 +0000 Message-ID: <20211201142918.921493-44-Liam.Howlett@oracle.com> References: <20211201142918.921493-1-Liam.Howlett@oracle.com> In-Reply-To: <20211201142918.921493-1-Liam.Howlett@oracle.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.30.2 x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 1f27c930-c3f0-4071-5107-08d9b4d72548 x-ms-traffictypediagnostic: SA2PR10MB4508: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:5236; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SN6PR10MB3022.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1f27c930-c3f0-4071-5107-08d9b4d72548 X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Dec 2021 14:30:10.2822 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: EVkCUyr1Qm26gq1hvO/q0U0QPJ/NSI4l68gP8vuGNaIMWZpnhtYJrd+dZgduvbMPRXTyINHUsrna4lw0q/R5ew== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA2PR10MB4508 X-Proofpoint-Virus-Version: vendor=nai engine=6300 definitions=10184 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxlogscore=999 phishscore=0 suspectscore=0 spamscore=0 adultscore=0 mlxscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112010082 X-Proofpoint-ORIG-GUID: i5IoUXzVBTlL17-QvqVrP1uppjzfCAMP X-Proofpoint-GUID: i5IoUXzVBTlL17-QvqVrP1uppjzfCAMP Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Liam R. Howlett" Don't use the mm_struct linked list or the vma->vm_next in prep for removal Signed-off-by: Liam R. Howlett --- fs/userfaultfd.c | 49 ++++++++++++++++++++++------------- include/linux/userfaultfd_k.h | 7 +++-- mm/mmap.c | 12 ++++----- 3 files changed, 40 insertions(+), 28 deletions(-) diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index 22bf14ab2d16..2880025598c7 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -606,14 +606,16 @@ static void userfaultfd_event_wait_completion(struct = userfaultfd_ctx *ctx, if (release_new_ctx) { struct vm_area_struct *vma; struct mm_struct *mm =3D release_new_ctx->mm; + VMA_ITERATOR(vmi, mm, 0); =20 /* the various vma->vm_userfaultfd_ctx still points to it */ mmap_write_lock(mm); - for (vma =3D mm->mmap; vma; vma =3D vma->vm_next) + for_each_vma(vmi, vma) { if (vma->vm_userfaultfd_ctx.ctx =3D=3D release_new_ctx) { vma->vm_userfaultfd_ctx =3D NULL_VM_UFFD_CTX; vma->vm_flags &=3D ~__VM_UFFD_FLAGS; } + } mmap_write_unlock(mm); =20 userfaultfd_ctx_put(release_new_ctx); @@ -794,11 +796,13 @@ static bool has_unmap_ctx(struct userfaultfd_ctx *ctx= , struct list_head *unmaps, return false; } =20 -int userfaultfd_unmap_prep(struct vm_area_struct *vma, - unsigned long start, unsigned long end, - struct list_head *unmaps) +int userfaultfd_unmap_prep(struct mm_struct *mm, unsigned long start, + unsigned long end, struct list_head *unmaps) { - for ( ; vma && vma->vm_start < end; vma =3D vma->vm_next) { + VMA_ITERATOR(vmi, mm, start); + struct vm_area_struct *vma; + + for_each_vma_range(vmi, vma, end) { struct userfaultfd_unmap_ctx *unmap_ctx; struct userfaultfd_ctx *ctx =3D vma->vm_userfaultfd_ctx.ctx; =20 @@ -848,6 +852,7 @@ static int userfaultfd_release(struct inode *inode, str= uct file *file) /* len =3D=3D 0 means wake all */ struct userfaultfd_wake_range range =3D { .len =3D 0, }; unsigned long new_flags; + MA_STATE(mas, &mm->mm_mt, 0, 0); =20 WRITE_ONCE(ctx->released, true); =20 @@ -864,7 +869,7 @@ static int userfaultfd_release(struct inode *inode, str= uct file *file) */ mmap_write_lock(mm); prev =3D NULL; - for (vma =3D mm->mmap; vma; vma =3D vma->vm_next) { + mas_for_each(&mas, vma, ULONG_MAX) { cond_resched(); BUG_ON(!!vma->vm_userfaultfd_ctx.ctx ^ !!(vma->vm_flags & __VM_UFFD_FLAGS)); @@ -1281,6 +1286,7 @@ static int userfaultfd_register(struct userfaultfd_ct= x *ctx, bool found; bool basic_ioctls; unsigned long start, end, vma_end; + MA_STATE(mas, &mm->mm_mt, 0, 0); =20 user_uffdio_register =3D (struct uffdio_register __user *) arg; =20 @@ -1323,7 +1329,8 @@ static int userfaultfd_register(struct userfaultfd_ct= x *ctx, goto out; =20 mmap_write_lock(mm); - vma =3D find_vma_prev(mm, start, &prev); + mas_set(&mas, start); + vma =3D mas_find(&mas, ULONG_MAX); if (!vma) goto out_unlock; =20 @@ -1348,7 +1355,7 @@ static int userfaultfd_register(struct userfaultfd_ct= x *ctx, */ found =3D false; basic_ioctls =3D false; - for (cur =3D vma; cur && cur->vm_start < end; cur =3D cur->vm_next) { + for (cur =3D vma; cur; cur =3D mas_next(&mas, end - 1)) { cond_resched(); =20 BUG_ON(!!cur->vm_userfaultfd_ctx.ctx ^ @@ -1408,8 +1415,10 @@ static int userfaultfd_register(struct userfaultfd_c= tx *ctx, } BUG_ON(!found); =20 - if (vma->vm_start < start) - prev =3D vma; + mas_set(&mas, start); + prev =3D mas_prev(&mas, 0); + if (prev !=3D vma) + mas_next(&mas, ULONG_MAX); =20 ret =3D 0; do { @@ -1466,8 +1475,8 @@ static int userfaultfd_register(struct userfaultfd_ct= x *ctx, skip: prev =3D vma; start =3D vma->vm_end; - vma =3D vma->vm_next; - } while (vma && vma->vm_start < end); + vma =3D mas_next(&mas, end - 1); + } while (vma); out_unlock: mmap_write_unlock(mm); mmput(mm); @@ -1511,6 +1520,7 @@ static int userfaultfd_unregister(struct userfaultfd_= ctx *ctx, bool found; unsigned long start, end, vma_end; const void __user *buf =3D (void __user *)arg; + MA_STATE(mas, &mm->mm_mt, 0, 0); =20 ret =3D -EFAULT; if (copy_from_user(&uffdio_unregister, buf, sizeof(uffdio_unregister))) @@ -1529,7 +1539,8 @@ static int userfaultfd_unregister(struct userfaultfd_= ctx *ctx, goto out; =20 mmap_write_lock(mm); - vma =3D find_vma_prev(mm, start, &prev); + mas_set(&mas, start); + vma =3D mas_find(&mas, ULONG_MAX); if (!vma) goto out_unlock; =20 @@ -1554,7 +1565,7 @@ static int userfaultfd_unregister(struct userfaultfd_= ctx *ctx, */ found =3D false; ret =3D -EINVAL; - for (cur =3D vma; cur && cur->vm_start < end; cur =3D cur->vm_next) { + for (cur =3D vma; cur; cur =3D mas_next(&mas, end - 1)) { cond_resched(); =20 BUG_ON(!!cur->vm_userfaultfd_ctx.ctx ^ @@ -1574,8 +1585,10 @@ static int userfaultfd_unregister(struct userfaultfd= _ctx *ctx, } BUG_ON(!found); =20 - if (vma->vm_start < start) - prev =3D vma; + mas_set(&mas, start); + prev =3D mas_prev(&mas, 0); + if (prev !=3D vma) + mas_next(&mas, ULONG_MAX); =20 ret =3D 0; do { @@ -1640,8 +1653,8 @@ static int userfaultfd_unregister(struct userfaultfd_= ctx *ctx, skip: prev =3D vma; start =3D vma->vm_end; - vma =3D vma->vm_next; - } while (vma && vma->vm_start < end); + vma =3D mas_next(&mas, end - 1); + } while (vma); out_unlock: mmap_write_unlock(mm); mmput(mm); diff --git a/include/linux/userfaultfd_k.h b/include/linux/userfaultfd_k.h index 33cea484d1ad..e0b2ec2c20f2 100644 --- a/include/linux/userfaultfd_k.h +++ b/include/linux/userfaultfd_k.h @@ -139,9 +139,8 @@ extern bool userfaultfd_remove(struct vm_area_struct *v= ma, unsigned long start, unsigned long end); =20 -extern int userfaultfd_unmap_prep(struct vm_area_struct *vma, - unsigned long start, unsigned long end, - struct list_head *uf); +extern int userfaultfd_unmap_prep(struct mm_struct *mm, unsigned long star= t, + unsigned long end, struct list_head *uf); extern void userfaultfd_unmap_complete(struct mm_struct *mm, struct list_head *uf); =20 @@ -222,7 +221,7 @@ static inline bool userfaultfd_remove(struct vm_area_st= ruct *vma, return true; } =20 -static inline int userfaultfd_unmap_prep(struct vm_area_struct *vma, +static inline int userfaultfd_unmap_prep(struct mm_struct *mm, unsigned long start, unsigned long end, struct list_head *uf) { diff --git a/mm/mmap.c b/mm/mmap.c index 79b8494d83c6..dde74e0b195d 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2449,7 +2449,7 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_a= rea_struct *vma, * split, despite we could. This is unlikely enough * failure that it's not worth optimizing it for. */ - int error =3D userfaultfd_unmap_prep(vma, start, end, uf); + int error =3D userfaultfd_unmap_prep(mm, start, end, uf); =20 if (error) return error; @@ -2938,10 +2938,7 @@ static int do_brk_munmap(struct ma_state *mas, struc= t vm_area_struct *vma, goto munmap_full_vma; } =20 - vma_init(&unmap, mm); - unmap.vm_start =3D newbrk; - unmap.vm_end =3D oldbrk; - ret =3D userfaultfd_unmap_prep(&unmap, newbrk, oldbrk, uf); + ret =3D userfaultfd_unmap_prep(mm, newbrk, oldbrk, uf); if (ret) return ret; ret =3D 1; @@ -2954,6 +2951,9 @@ static int do_brk_munmap(struct ma_state *mas, struct= vm_area_struct *vma, } =20 vma->vm_end =3D newbrk; + vma_init(&unmap, mm); + unmap.vm_start =3D newbrk; + unmap.vm_end =3D oldbrk; if (vma_mas_remove(&unmap, mas)) goto mas_store_fail; =20 @@ -2963,7 +2963,7 @@ static int do_brk_munmap(struct ma_state *mas, struct= vm_area_struct *vma, } =20 unmap_pages =3D vma_pages(&unmap); - if (unmap.vm_flags & VM_LOCKED) { + if (vma->vm_flags & VM_LOCKED) { mm->locked_vm -=3D unmap_pages; munlock_vma_pages_range(&unmap, newbrk, oldbrk); } --=20 2.30.2