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Tue, 14 Mar 2023 11:38:21 +0800 From: Peng Zhang To: , CC: , , , , , , , ZhangPeng Subject: [PATCH 3/3] userfaultfd: convert __mcopy_atomic() to use a folio Date: Tue, 14 Mar 2023 03:37:34 +0000 Message-ID: <20230314033734.481904-4-zhangpeng362@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230314033734.481904-1-zhangpeng362@huawei.com> References: <20230314033734.481904-1-zhangpeng362@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To kwepemm600020.china.huawei.com (7.193.23.147) X-CFilter-Loop: Reflected X-Rspam-User: X-Rspamd-Queue-Id: 64AFC40019 X-Rspamd-Server: rspam01 X-Stat-Signature: 8tk8tfye341814x8eprt15785r5axaqu X-HE-Tag: 1678765107-144032 X-HE-Meta: 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 uEUlao7m 5ra1fnIHbEWuLB9bpliLuM/GABtn9hYvlAGTAFCY43ltaiPGIBgoLAVPIgPiBUzYMoEDFdh/m4UPqYPWHaHZAtu/V/EMdUaOP1JR3DgSj7lOOJhbwN6/3cNmSEXULWfYU2CI9PV/10ueAYhDMfu/wjPzLd+rkNJ0isyrQELy8qx5vn5WjZ9pdhaInrfgWvE1Fq4VA14MfwvY1cHk2nEAiX6aGD/9yd6KV+1uTTSJWbjw7c6pQIZEnYPrxbjRZ0r7U+C5a7pbDL2WtqeQWywL6XHbiDI6HCMmlQmn0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: ZhangPeng Convert mcopy_atomic_pte(), shmem_mfill_atomic_pte() and mfill_atomic_pte() to pass in a folio pointer. Convert __mcopy_atomic() to use a folio. Signed-off-by: ZhangPeng --- include/linux/shmem_fs.h | 2 +- mm/shmem.c | 17 ++++++++--------- mm/userfaultfd.c | 35 +++++++++++++++++------------------ 3 files changed, 26 insertions(+), 28 deletions(-) diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h index 103d1000a5a2..580af0e3bf02 100644 --- a/include/linux/shmem_fs.h +++ b/include/linux/shmem_fs.h @@ -156,7 +156,7 @@ extern int shmem_mfill_atomic_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd, unsigned long dst_addr, unsigned long src_addr, bool zeropage, bool wp_copy, - struct page **pagep); + struct folio **foliop); #else /* !CONFIG_SHMEM */ #define shmem_mfill_atomic_pte(dst_mm, dst_pmd, dst_vma, dst_addr, \ src_addr, zeropage, wp_copy, pagep) ({ BUG(); 0; }) diff --git a/mm/shmem.c b/mm/shmem.c index 448f393d8ab2..986267bf34ef 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2421,7 +2421,7 @@ int shmem_mfill_atomic_pte(struct mm_struct *dst_mm, unsigned long dst_addr, unsigned long src_addr, bool zeropage, bool wp_copy, - struct page **pagep) + struct folio **foliop) { struct inode *inode = file_inode(dst_vma->vm_file); struct shmem_inode_info *info = SHMEM_I(inode); @@ -2439,14 +2439,14 @@ int shmem_mfill_atomic_pte(struct mm_struct *dst_mm, * and now we find ourselves with -ENOMEM. Release the page, to * avoid a BUG_ON in our caller. */ - if (unlikely(*pagep)) { - put_page(*pagep); - *pagep = NULL; + if (unlikely(*foliop)) { + folio_put(*foliop); + *foliop = NULL; } return -ENOMEM; } - if (!*pagep) { + if (!*foliop) { ret = -ENOMEM; folio = shmem_alloc_folio(gfp, info, pgoff); if (!folio) @@ -2478,7 +2478,7 @@ int shmem_mfill_atomic_pte(struct mm_struct *dst_mm, /* fallback to copy_from_user outside mmap_lock */ if (unlikely(ret)) { - *pagep = &folio->page; + *foliop = folio; ret = -ENOENT; /* don't free the page */ goto out_unacct_blocks; @@ -2489,9 +2489,8 @@ int shmem_mfill_atomic_pte(struct mm_struct *dst_mm, clear_user_highpage(&folio->page, dst_addr); } } else { - folio = page_folio(*pagep); - VM_BUG_ON_FOLIO(folio_test_large(folio), folio); - *pagep = NULL; + VM_BUG_ON_FOLIO(folio_test_large(*foliop), folio); + *foliop = NULL; } VM_BUG_ON(folio_test_locked(folio)); diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index d7435a1a9d4b..3d08a1e3cbe7 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -132,14 +132,14 @@ static int mcopy_atomic_pte(struct mm_struct *dst_mm, struct vm_area_struct *dst_vma, unsigned long dst_addr, unsigned long src_addr, - struct page **pagep, + struct folio **foliop, bool wp_copy) { void *page_kaddr; int ret; struct folio *folio; - if (!*pagep) { + if (!*foliop) { ret = -ENOMEM; folio = vma_alloc_folio(GFP_HIGHUSER_MOVABLE, 0, dst_vma, dst_addr, false); if (!folio) @@ -171,16 +171,15 @@ static int mcopy_atomic_pte(struct mm_struct *dst_mm, /* fallback to copy_from_user outside mmap_lock */ if (unlikely(ret)) { ret = -ENOENT; - *pagep = &folio->page; + *foliop = folio; /* don't free the page */ goto out; } flush_dcache_folio(folio); } else { - folio = page_folio(*pagep); - VM_BUG_ON_FOLIO(folio_test_large(folio), folio); - *pagep = NULL; + VM_BUG_ON_FOLIO(folio_test_large(*foliop), folio); + *foliop = NULL; } /* @@ -476,7 +475,7 @@ static __always_inline ssize_t mfill_atomic_pte(struct mm_struct *dst_mm, struct vm_area_struct *dst_vma, unsigned long dst_addr, unsigned long src_addr, - struct page **page, + struct folio **foliop, enum mcopy_atomic_mode mode, bool wp_copy) { @@ -500,7 +499,7 @@ static __always_inline ssize_t mfill_atomic_pte(struct mm_struct *dst_mm, if (!(dst_vma->vm_flags & VM_SHARED)) { if (mode == MCOPY_ATOMIC_NORMAL) err = mcopy_atomic_pte(dst_mm, dst_pmd, dst_vma, - dst_addr, src_addr, page, + dst_addr, src_addr, foliop, wp_copy); else err = mfill_zeropage_pte(dst_mm, dst_pmd, @@ -509,7 +508,7 @@ static __always_inline ssize_t mfill_atomic_pte(struct mm_struct *dst_mm, err = shmem_mfill_atomic_pte(dst_mm, dst_pmd, dst_vma, dst_addr, src_addr, mode != MCOPY_ATOMIC_NORMAL, - wp_copy, page); + wp_copy, foliop); } return err; @@ -528,7 +527,7 @@ static __always_inline ssize_t __mcopy_atomic(struct mm_struct *dst_mm, pmd_t *dst_pmd; unsigned long src_addr, dst_addr; long copied; - struct page *page; + struct folio *folio; bool wp_copy; /* @@ -544,7 +543,7 @@ static __always_inline ssize_t __mcopy_atomic(struct mm_struct *dst_mm, src_addr = src_start; dst_addr = dst_start; copied = 0; - page = NULL; + folio = NULL; retry: mmap_read_lock(dst_mm); @@ -641,16 +640,16 @@ static __always_inline ssize_t __mcopy_atomic(struct mm_struct *dst_mm, BUG_ON(pmd_trans_huge(*dst_pmd)); err = mfill_atomic_pte(dst_mm, dst_pmd, dst_vma, dst_addr, - src_addr, &page, mcopy_mode, wp_copy); + src_addr, &folio, mcopy_mode, wp_copy); cond_resched(); if (unlikely(err == -ENOENT)) { void *page_kaddr; mmap_read_unlock(dst_mm); - BUG_ON(!page); + BUG_ON(!folio); - page_kaddr = kmap_local_page(page); + page_kaddr = kmap_local_folio(folio, 0); err = copy_from_user(page_kaddr, (const void __user *) src_addr, PAGE_SIZE); @@ -659,10 +658,10 @@ static __always_inline ssize_t __mcopy_atomic(struct mm_struct *dst_mm, err = -EFAULT; goto out; } - flush_dcache_page(page); + flush_dcache_folio(folio); goto retry; } else - BUG_ON(page); + BUG_ON(folio); if (!err) { dst_addr += PAGE_SIZE; @@ -679,8 +678,8 @@ static __always_inline ssize_t __mcopy_atomic(struct mm_struct *dst_mm, out_unlock: mmap_read_unlock(dst_mm); out: - if (page) - put_page(page); + if (folio) + folio_put(folio); BUG_ON(copied < 0); BUG_ON(err > 0); BUG_ON(!copied && !err);