From: "Lorenzo Stoakes (Oracle)" <ljs@kernel•org>
To: Andrew Morton <akpm@linux-foundation•org>
Cc: Jonathan Corbet <corbet@lwn•net>,
Clemens Ladisch <clemens@ladisch•de>,
Arnd Bergmann <arnd@arndb•de>,
Greg Kroah-Hartman <gregkh@linuxfoundation•org>,
"K . Y . Srinivasan" <kys@microsoft•com>,
Haiyang Zhang <haiyangz@microsoft•com>,
Wei Liu <wei.liu@kernel•org>, Dexuan Cui <decui@microsoft•com>,
Long Li <longli@microsoft•com>,
Alexander Shishkin <alexander.shishkin@linux•intel.com>,
Maxime Coquelin <mcoquelin.stm32@gmail•com>,
Alexandre Torgue <alexandre.torgue@foss•st.com>,
Miquel Raynal <miquel.raynal@bootlin•com>,
Richard Weinberger <richard@nod•at>,
Vignesh Raghavendra <vigneshr@ti•com>,
Bodo Stroesser <bostroesser@gmail•com>,
"Martin K . Petersen" <martin.petersen@oracle•com>,
David Howells <dhowells@redhat•com>,
Marc Dionne <marc.dionne@auristor•com>,
Alexander Viro <viro@zeniv•linux.org.uk>,
Christian Brauner <brauner@kernel•org>, Jan Kara <jack@suse•cz>,
David Hildenbrand <david@kernel•org>,
"Liam R . Howlett" <Liam.Howlett@oracle•com>,
Vlastimil Babka <vbabka@kernel•org>,
Mike Rapoport <rppt@kernel•org>,
Suren Baghdasaryan <surenb@google•com>,
Michal Hocko <mhocko@suse•com>, Jann Horn <jannh@google•com>,
Pedro Falcato <pfalcato@suse•de>,
linux-kernel@vger•kernel.org, linux-doc@vger•kernel.org,
linux-hyperv@vger•kernel.org,
linux-stm32@st-md-mailman•stormreply.com,
linux-arm-kernel@lists•infradead.org,
linux-mtd@lists•infradead.org, linux-staging@lists•linux.dev,
linux-scsi@vger•kernel.org, target-devel@vger•kernel.org,
linux-afs@lists•infradead.org, linux-fsdevel@vger•kernel.org,
linux-mm@kvack•org, Ryan Roberts <ryan.roberts@arm•com>
Subject: [PATCH 00/15] mm: expand mmap_prepare functionality and usage
Date: Thu, 12 Mar 2026 20:27:15 +0000 [thread overview]
Message-ID: <cover.1773346620.git.ljs@kernel.org> (raw)
This series expands the mmap_prepare functionality, which is intended to
replace the deprecated f_op->mmap hook which has been the source of bugs
and security issues for some time.
This series starts with some cleanup of existing mmap_prepare logic, then
adds documentation for the mmap_prepare call to make it easier for
filesystem and driver writers to understand how it works.
It then importantly adds a vm_ops->mapped hook, a key feature that was
missing from mmap_prepare previously - this is invoked when a driver which
specifies mmap_prepare has successfully been mapped but not merged with
another VMA.
Importantly, mmap_prepare is invoked prior to a merge being attempted, so
you cannot manipulate state such as reference counts as if it were a new
mapping.
The vm_ops->mapped hook allows a driver to perform tasks required at this
stage, and provides symmetry against subsequent vm_ops->open,close calls.
The series uses this to correct the afs implementation which wrongly
manipulated reference count at mmap_prepare time.
It then adds an mmap_prepare equivalent of vm_iomap_memory() -
mmap_action_simple_ioremap(), then uses this to update a number of drivers.
It then splits out the mmap_prepare compatibility layer (which allows for
invocation of mmap_prepare hooks in an mmap() hook) in such a way as to
allow for more incremental implementation of mmap_prepare hooks.
It then uses this to extend mmap_prepare usage in drivers.
Finally it adds an mmap_prepare equivalent of vm_map_pages(), which lays
the foundation for future work which will extend mmap_prepare to DMA
coherent mappings.
Lorenzo Stoakes (Oracle) (15):
mm: various small mmap_prepare cleanups
mm: add documentation for the mmap_prepare file operation callback
mm: document vm_operations_struct->open the same as close()
mm: add vm_ops->mapped hook
fs: afs: correctly drop reference count on mapping failure
mm: add mmap_action_simple_ioremap()
misc: open-dice: replace deprecated mmap hook with mmap_prepare
hpet: replace deprecated mmap hook with mmap_prepare
mtdchar: replace deprecated mmap hook with mmap_prepare, clean up
stm: replace deprecated mmap hook with mmap_prepare
staging: vme_user: replace deprecated mmap hook with mmap_prepare
mm: allow handling of stacked mmap_prepare hooks in more drivers
drivers: hv: vmbus: replace deprecated mmap hook with mmap_prepare
uio: replace deprecated mmap hook with mmap_prepare in uio_info
mm: add mmap_action_map_kernel_pages[_full]()
Documentation/driver-api/vme.rst | 2 +-
Documentation/filesystems/mmap_prepare.rst | 141 ++++++++++++++
drivers/char/hpet.c | 12 +-
drivers/hv/hyperv_vmbus.h | 4 +-
drivers/hv/vmbus_drv.c | 27 ++-
drivers/hwtracing/stm/core.c | 31 ++-
drivers/misc/open-dice.c | 19 +-
drivers/mtd/mtdchar.c | 21 +-
drivers/staging/vme_user/vme.c | 20 +-
drivers/staging/vme_user/vme.h | 2 +-
drivers/staging/vme_user/vme_user.c | 51 +++--
drivers/target/target_core_user.c | 26 ++-
drivers/uio/uio.c | 10 +-
drivers/uio/uio_hv_generic.c | 11 +-
fs/afs/file.c | 20 +-
include/linux/fs.h | 14 +-
include/linux/hyperv.h | 4 +-
include/linux/mm.h | 158 +++++++++++++--
include/linux/mm_types.h | 17 +-
include/linux/uio_driver.h | 4 +-
mm/internal.h | 41 ++--
mm/memory.c | 174 ++++++++++++-----
mm/util.c | 213 +++++++++++++++------
mm/vma.c | 56 ++++--
mm/vma.h | 2 +-
tools/testing/vma/include/dup.h | 143 ++++++++++----
tools/testing/vma/include/stubs.h | 9 +-
27 files changed, 933 insertions(+), 299 deletions(-)
create mode 100644 Documentation/filesystems/mmap_prepare.rst
--
2.53.0
next reply other threads:[~2026-03-12 20:27 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-12 20:27 Lorenzo Stoakes (Oracle) [this message]
2026-03-12 20:27 ` [PATCH 01/15] mm: various small mmap_prepare cleanups Lorenzo Stoakes (Oracle)
2026-03-12 21:14 ` Andrew Morton
2026-03-13 12:13 ` Lorenzo Stoakes (Oracle)
2026-03-15 22:56 ` Suren Baghdasaryan
2026-03-15 23:06 ` Suren Baghdasaryan
2026-03-16 14:47 ` Lorenzo Stoakes (Oracle)
2026-03-16 14:44 ` Lorenzo Stoakes (Oracle)
2026-03-16 21:27 ` Suren Baghdasaryan
2026-03-12 20:27 ` [PATCH 02/15] mm: add documentation for the mmap_prepare file operation callback Lorenzo Stoakes (Oracle)
2026-03-13 0:12 ` Randy Dunlap
2026-03-16 14:51 ` Lorenzo Stoakes (Oracle)
2026-03-15 23:23 ` Suren Baghdasaryan
2026-03-16 19:16 ` Lorenzo Stoakes (Oracle)
2026-03-16 22:59 ` Suren Baghdasaryan
2026-03-12 20:27 ` [PATCH 03/15] mm: document vm_operations_struct->open the same as close() Lorenzo Stoakes (Oracle)
2026-03-16 0:43 ` Suren Baghdasaryan
2026-03-16 14:31 ` Lorenzo Stoakes (Oracle)
2026-03-12 20:27 ` [PATCH 04/15] mm: add vm_ops->mapped hook Lorenzo Stoakes (Oracle)
2026-03-13 11:02 ` Usama Arif
2026-03-13 11:58 ` Lorenzo Stoakes (Oracle)
2026-03-16 2:18 ` Suren Baghdasaryan
2026-03-16 13:39 ` Lorenzo Stoakes (Oracle)
2026-03-16 23:39 ` Suren Baghdasaryan
2026-03-17 8:42 ` Lorenzo Stoakes (Oracle)
2026-03-12 20:27 ` [PATCH 05/15] fs: afs: correctly drop reference count on mapping failure Lorenzo Stoakes (Oracle)
2026-03-13 11:07 ` Usama Arif
2026-03-13 12:00 ` Lorenzo Stoakes (Oracle)
2026-03-16 2:32 ` Suren Baghdasaryan
2026-03-16 14:29 ` Lorenzo Stoakes (Oracle)
2026-03-17 3:41 ` Suren Baghdasaryan
2026-03-17 8:58 ` Lorenzo Stoakes (Oracle)
2026-03-12 20:27 ` [PATCH 06/15] mm: add mmap_action_simple_ioremap() Lorenzo Stoakes (Oracle)
2026-03-12 20:27 ` [PATCH 07/15] misc: open-dice: replace deprecated mmap hook with mmap_prepare Lorenzo Stoakes (Oracle)
2026-03-12 20:27 ` [PATCH 08/15] hpet: " Lorenzo Stoakes (Oracle)
2026-03-12 20:27 ` [PATCH 09/15] mtdchar: replace deprecated mmap hook with mmap_prepare, clean up Lorenzo Stoakes (Oracle)
2026-03-12 20:27 ` [PATCH 10/15] stm: replace deprecated mmap hook with mmap_prepare Lorenzo Stoakes (Oracle)
2026-03-12 20:27 ` [PATCH 11/15] staging: vme_user: " Lorenzo Stoakes (Oracle)
2026-03-12 20:27 ` [PATCH 12/15] mm: allow handling of stacked mmap_prepare hooks in more drivers Lorenzo Stoakes (Oracle)
2026-03-12 20:27 ` [PATCH 13/15] drivers: hv: vmbus: replace deprecated mmap hook with mmap_prepare Lorenzo Stoakes (Oracle)
2026-03-12 20:27 ` [PATCH 14/15] uio: replace deprecated mmap hook with mmap_prepare in uio_info Lorenzo Stoakes (Oracle)
2026-03-12 20:27 ` [PATCH 15/15] mm: add mmap_action_map_kernel_pages[_full]() Lorenzo Stoakes (Oracle)
2026-03-12 23:15 ` Randy Dunlap
2026-03-16 14:54 ` Lorenzo Stoakes (Oracle)
2026-03-12 21:23 ` [PATCH 00/15] mm: expand mmap_prepare functionality and usage Andrew Morton
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