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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?VnZIwVQWtpFTgVQspypLuI1Jihny1VGKjkf03w4kKnm/5f4WmO0vvRi9IiKT?= =?us-ascii?Q?iSI7XmAKXfwmPODODpxrP9GDxLfHiV3dGwRmlsgJE9rrEylv65TsBuanSYRu?= =?us-ascii?Q?qWyw9b3//dvl4lTrUREZ5WdJP2v1YohFwiwaNlgIH5PedJU4Vr05LOuFotDk?= =?us-ascii?Q?JhwBadrLESI2vkYXutj4XN47jEKh5lJtG29sLJmVBjSP34Tv/YpQS4H0M4X+?= =?us-ascii?Q?8hMqexNMbdEnpEVinbSqfr2l6LDPk9R4aOstnGJlA7lUa8WyYUujtzwAFjya?= =?us-ascii?Q?/DUXJdPffTs82RDjvCBQNT6BazbfAXdZkpqsrEuSg0+mAqt/iGhgQrEPdEJj?= =?us-ascii?Q?iX46k7eHVW/5cLkuoj1MVLSytJcyAN/9hpP+GXrYluc9+6ZToQ3CbRMiaRav?= =?us-ascii?Q?KSM4mKE/2z7XdIR5j2NXV5CxZg8U5wURiwgJj2Vf4x6+cHUUwQzZ/PmPEfnm?= =?us-ascii?Q?u359H2Sha+3xTPDFOE/mixr82s+d0OguoGlhdGDrgYaeg8dROMIyHzNF76Yy?= =?us-ascii?Q?/HaC45njxnyyEAetrtS+oDidoFomB5+QiUgsFr3ReKGmPqxdGbUt3tepDZG+?= =?us-ascii?Q?QFCDOZl5TprrQ5FFeJuuOO/ezjz2AP36Jbymu5cREIAdJcSvpXkgO+FctwmQ?= =?us-ascii?Q?eqSV7XyrB6xagskieQyURXDi921dkr/EnVZYWY5mlAsCOUY43ChXPOUd7ege?= =?us-ascii?Q?P1VbEtwDtIXKaEbv10lwmIrfMp/i0Q9aKi7BrME82VxNzM+KiGprkeUszvU7?= =?us-ascii?Q?SedJKBDRNS13wZIG4r3kY+o2CvNeGJ6RYI+c87ks9ih4ElM/GKC5aY33iyJp?= =?us-ascii?Q?p/G9/AsLl3UCKOlcLwTJsGasz6vpDPLI6O3QsSB0W6d0s6lAltm+/eBSskhE?= =?us-ascii?Q?lbtW9knRnZ/Lyj5pvhe/eMowLjqcS7O7bhIR+uUw/n1RkuFj2v0Kr+lZjj+K?= =?us-ascii?Q?6L3LgrRZ/Y9GdH78RxXSOVA6G+W29nLQ7npgr6ZYKJuL89vEz7Puo8t/bopc?= =?us-ascii?Q?nsMxq6KjCjx8aex7MYfJ7bqqsRNa4b84L3akVNSoC+gBNEyZK08A4kNmdmFn?= =?us-ascii?Q?0V4bvE1wOV5aVqu+i9z56zfR8Sth487zJ8QXI660GPV5vRtb6Oq1tC8J0V3r?= =?us-ascii?Q?PXiTjYkX2VRKqKArsVj+FzgkTkhY88cJseWd0zq5VTYPsZCedroSpI2f5L6k?= =?us-ascii?Q?aT464FqqrsutnD82P7Xe412AqhHNHfAS9UKuQFGbMiDQJz5XmtEgqHw3XDit?= =?us-ascii?Q?DxZmK38CpynxDgwJYjbl9Ig8QfXOOriY35schB2xboIMQkqmRE2VkiZ9oai0?= =?us-ascii?Q?ZLlarn936hQIMid/5v9d1XyIf2PJXWFGEeA8wGmfKTmlqVpTwH0B7SgCF421?= =?us-ascii?Q?qDitLNVpjr3skzC8r8RhtEsYjRvefMf0bpTYkTn/oRRegEysC68Pdu9JvvIl?= =?us-ascii?Q?MAU7Wutsdl1ZpMIBIpRIPo66bTv9dNJb5Bu2X5LOXwN3EkPtLBy3KD+o7VxH?= =?us-ascii?Q?tbSZE5BZmqCw+At0JCUCuo11dLAQMUP71DXzH/Pcxi9cLRwgfHgssObU+Oh8?= =?us-ascii?Q?9TovpXyV0IeVQVEbFX1gO8Xl8qSaFUjMCmHbpXfbuNSypRSqptJnDaN+QhC3?= =?us-ascii?Q?Gg=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: 57bad7e4-f8bb-40a4-1dac-08dad289147d X-MS-Exchange-CrossTenant-AuthSource: MWHPR1101MB2126.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Nov 2022 04:12:22.4317 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: jKHp0hxkqD32aLjdba5LQ79MiCaNSpoAzzSMkeU8qKNvfagVmNgihBi36z02FsPG/m1AbCYs0wDmU+RsrPWjtYqF1HanfcMlJJ16UXLXvPk= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR11MB7799 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Shiyang Ruan wrote: > This patch fixes the warning message reported in dax_associate_entry() > and dax_disassociate_entry(). Can you include the xfstest test number and a snippet of the warning message. > 1. reset page->mapping and ->index when refcount counting down to 0. > 2. set IOMAP_F_SHARED flag when iomap read to allow one dax page to be > associated more than once for not only write but also read. > 3. should zero the edge (when not aligned) if srcmap is HOLE or > UNWRITTEN. > 4. iterator of two files in dedupe should be executed side by side, not > nested. > 5. use xfs_dax_write_iomap_ops for xfs zero and truncate. Do these all need to be done at once, or is this 5 patches? > > Signed-off-by: Shiyang Ruan > --- > fs/dax.c | 114 ++++++++++++++++++++++++++------------------- > fs/xfs/xfs_iomap.c | 6 +-- > 2 files changed, 69 insertions(+), 51 deletions(-) > > diff --git a/fs/dax.c b/fs/dax.c > index 1c6867810cbd..5ea7c0926b7f 100644 > --- a/fs/dax.c > +++ b/fs/dax.c > @@ -398,7 +398,7 @@ static void dax_disassociate_entry(void *entry, struct address_space *mapping, > WARN_ON_ONCE(trunc && page_ref_count(page) > 1); > if (dax_mapping_is_cow(page->mapping)) { > /* keep the CoW flag if this page is still shared */ > - if (page->index-- > 0) > + if (page->index-- > 1) I think this wants either a helper function to make it clear that ->index is being used as a share count, or go ahead and rename that field in this context with something like: diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 910d880e67eb..1a409288f39d 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -103,7 +103,10 @@ struct page { }; /* See page-flags.h for PAGE_MAPPING_FLAGS */ struct address_space *mapping; - pgoff_t index; /* Our offset within mapping. */ + union { + pgoff_t index; /* Our offset within mapping. */ + unsigned long share; + }; /** * @private: Mapping-private opaque data. * Usually used for buffer_heads if PagePrivate.