From: Dan Williams <dan.j.williams@intel.com>
To: Alistair Popple <apopple@nvidia.com>, <akpm@linux-foundation.org>,
<dan.j.williams@intel.com>, <linux-mm@kvack.org>
Cc: Alistair Popple <apopple@nvidia.com>, <lina@asahilina.net>,
<zhang.lyra@gmail.com>, <gerald.schaefer@linux.ibm.com>,
<vishal.l.verma@intel.com>, <dave.jiang@intel.com>,
<logang@deltatee.com>, <bhelgaas@google.com>, <jack@suse.cz>,
<jgg@ziepe.ca>, <catalin.marinas@arm.com>, <will@kernel.org>,
<mpe@ellerman.id.au>, <npiggin@gmail.com>,
<dave.hansen@linux.intel.com>, <ira.weiny@intel.com>,
<willy@infradead.org>, <djwong@kernel.org>, <tytso@mit.edu>,
<linmiaohe@huawei.com>, <david@redhat.com>, <peterx@redhat.com>,
<linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linuxppc-dev@lists.ozlabs.org>, <nvdimm@lists.linux.dev>,
<linux-cxl@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>,
<linux-ext4@vger.kernel.org>, <linux-xfs@vger.kernel.org>,
<jhubbard@nvidia.com>, <hch@lst.de>, <david@fromorbit.com>
Subject: Re: [PATCH v5 02/25] fs/dax: Return unmapped busy pages from dax_layout_busy_page_range()
Date: Wed, 8 Jan 2025 14:30:59 -0800 [thread overview]
Message-ID: <677efca34ca0b_f58f2943e@dwillia2-xfh.jf.intel.com.notmuch> (raw)
In-Reply-To: <db02794f12a4cc8c659a1123bdc90fcb4dcb1104.1736221254.git-series.apopple@nvidia.com>
Alistair Popple wrote:
> dax_layout_busy_page_range() is used by file systems to scan the DAX
> page-cache to unmap mapping pages from user-space and to determine if
> any pages in the given range are busy, either due to ongoing DMA or
> other get_user_pages() usage.
>
> Currently it checks to see the file mapping is mapped into user-space
> with mapping_mapped() and returns early if not, skipping the check for
> DMA busy pages. This is wrong as pages may still be undergoing DMA
> access even if they have subsequently been unmapped from
> user-space. Fix this by dropping the check for mapping_mapped().
>
> Signed-off-by: Alistair Popple <apopple@nvidia.com>
> Suggested-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
next prev parent reply other threads:[~2025-01-08 22:31 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-07 3:42 [PATCH v5 00/25] fs/dax: Fix ZONE_DEVICE page reference counts Alistair Popple
2025-01-07 3:42 ` [PATCH v5 01/25] fuse: Fix dax truncate/punch_hole fault path Alistair Popple
2025-01-08 22:30 ` Dan Williams
2025-01-09 4:38 ` Alistair Popple
2025-01-07 3:42 ` [PATCH v5 02/25] fs/dax: Return unmapped busy pages from dax_layout_busy_page_range() Alistair Popple
2025-01-08 22:30 ` Dan Williams [this message]
2025-01-07 3:42 ` [PATCH v5 03/25] fs/dax: Don't skip locked entries when scanning entries Alistair Popple
2025-01-08 22:50 ` Dan Williams
2025-01-09 5:21 ` Alistair Popple
2025-01-07 3:42 ` [PATCH v5 04/25] fs/dax: Refactor wait for dax idle page Alistair Popple
2025-01-07 3:42 ` [PATCH v5 05/25] fs/dax: Create a common implementation to break DAX layouts Alistair Popple
2025-01-09 0:14 ` Dan Williams
2025-01-09 6:15 ` Alistair Popple
2025-01-10 6:56 ` Dan Williams
2025-01-07 3:42 ` [PATCH v5 06/25] fs/dax: Always remove DAX page-cache entries when breaking layouts Alistair Popple
2025-01-07 3:42 ` [PATCH v5 07/25] fs/dax: Ensure all pages are idle prior to filesystem unmount Alistair Popple
2025-01-07 3:42 ` [PATCH v5 08/25] fs/dax: Remove PAGE_MAPPING_DAX_SHARED mapping flag Alistair Popple
2025-01-07 3:42 ` [PATCH v5 09/25] mm/gup: Remove redundant check for PCI P2PDMA page Alistair Popple
2025-01-07 3:42 ` [PATCH v5 10/25] mm/mm_init: Move p2pdma page refcount initialisation to p2pdma Alistair Popple
2025-01-07 3:42 ` [PATCH v5 11/25] mm: Allow compound zone device pages Alistair Popple
2025-01-07 3:42 ` [PATCH v5 12/25] mm/memory: Enhance insert_page_into_pte_locked() to create writable mappings Alistair Popple
2025-01-07 3:42 ` [PATCH v5 13/25] mm/memory: Add vmf_insert_page_mkwrite() Alistair Popple
2025-01-07 3:42 ` [PATCH v5 14/25] rmap: Add support for PUD sized mappings to rmap Alistair Popple
2025-01-07 11:36 ` David Hildenbrand
2025-01-07 3:42 ` [PATCH v5 15/25] huge_memory: Add vmf_insert_folio_pud() Alistair Popple
2025-01-08 3:54 ` kernel test robot
2025-01-07 3:42 ` [PATCH v5 16/25] huge_memory: Add vmf_insert_folio_pmd() Alistair Popple
2025-01-07 3:42 ` [PATCH v5 17/25] memremap: Add is_devdax_page() and is_fsdax_page() helpers Alistair Popple
2025-01-07 3:42 ` [PATCH v5 18/25] mm/gup: Don't allow FOLL_LONGTERM pinning of FS DAX pages Alistair Popple
2025-01-07 3:42 ` [PATCH v5 19/25] proc/task_mmu: Mark devdax and fsdax pages as always unpinned Alistair Popple
2025-01-07 3:42 ` [PATCH v5 20/25] mm/mlock: Skip ZONE_DEVICE PMDs during mlock Alistair Popple
2025-01-07 3:42 ` [PATCH v5 21/25] fs/dax: Properly refcount fs dax pages Alistair Popple
2025-01-07 3:42 ` [PATCH v5 22/25] device/dax: Properly refcount device dax pages when mapping Alistair Popple
2025-01-07 3:42 ` [PATCH v5 23/25] mm: Remove pXX_devmap callers Alistair Popple
2025-01-07 3:42 ` [PATCH v5 24/25] mm: Remove devmap related functions and page table bits Alistair Popple
2025-01-07 3:42 ` [PATCH v5 25/25] Revert "riscv: mm: Add support for ZONE_DEVICE" Alistair Popple
2025-01-08 6:26 ` [PATCH v5 00/25] fs/dax: Fix ZONE_DEVICE page reference counts Andrew Morton
2025-01-08 21:51 ` Dan Williams
2025-01-09 1:34 ` Alison Schofield
2025-01-10 6:03 ` Alistair Popple
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