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Message-ID: <b09de1e8544384074165d92d048e80058d971286.1750099179.git.lorenzo.stoakes@oracle.com>
Date: Mon, 16 Jun 2025 20:33:23 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: "Liam R . Howlett" <Liam.Howlett@...cle.com>, Jens Axboe <axboe@...nel.dk>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Tvrtko Ursulin <tursulin@...ulin.net>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Eric Van Hensbergen <ericvh@...nel.org>,
Latchesar Ionkov <lucho@...kov.net>,
Dominique Martinet <asmadeus@...ewreck.org>,
Christian Schoenebeck <linux_oss@...debyte.com>,
David Sterba <dsterba@...e.com>, David Howells <dhowells@...hat.com>,
Marc Dionne <marc.dionne@...istor.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
Benjamin LaHaise <bcrl@...ck.org>, Miklos Szeredi <miklos@...redi.hu>,
Amir Goldstein <amir73il@...il.com>,
Kent Overstreet <kent.overstreet@...ux.dev>,
"Tigran A . Aivazian" <aivazian.tigran@...il.com>,
Kees Cook <kees@...nel.org>, Chris Mason <clm@...com>,
Josef Bacik <josef@...icpanda.com>, Xiubo Li <xiubli@...hat.com>,
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coda@...cmu.edu, Tyler Hicks <code@...icks.com>,
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OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
Viacheslav Dubeyko <slava@...eyko.com>,
John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
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Subject: [PATCH 04/10] fs/dax: make it possible to check dev dax support without a VMA
This is a prerequisite for adapting those filesystems to use the
.mmap_prepare() hook for mmap()'ing which invoke this check as this hook
does not have access to a VMA pointer.
To effect this, change the signature of daxdev_mapping_supported() and
update its callers (ext4 and xfs mmap()'ing hook code).
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
---
fs/ext4/file.c | 2 +-
fs/xfs/xfs_file.c | 3 ++-
include/linux/dax.h | 16 +++++++++-------
3 files changed, 12 insertions(+), 9 deletions(-)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 21df81347147..08a814fcd956 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -821,7 +821,7 @@ static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
* We don't support synchronous mappings for non-DAX files and
* for DAX files if underneath dax_device is not synchronous.
*/
- if (!daxdev_mapping_supported(vma, dax_dev))
+ if (!daxdev_mapping_supported(vma->vm_flags, vma->vm_file, dax_dev))
return -EOPNOTSUPP;
file_accessed(file);
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 48254a72071b..ab97ce1f9087 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1924,7 +1924,8 @@ xfs_file_mmap(
* We don't support synchronous mappings for non-DAX files and
* for DAX files if underneath dax_device is not synchronous.
*/
- if (!daxdev_mapping_supported(vma, target->bt_daxdev))
+ if (!daxdev_mapping_supported(vma->vm_flags, vma->vm_file,
+ target->bt_daxdev))
return -EOPNOTSUPP;
file_accessed(file);
diff --git a/include/linux/dax.h b/include/linux/dax.h
index dcc9fcdf14e4..d0092cefb963 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -65,12 +65,13 @@ size_t dax_recovery_write(struct dax_device *dax_dev, pgoff_t pgoff,
/*
* Check if given mapping is supported by the file / underlying device.
*/
-static inline bool daxdev_mapping_supported(struct vm_area_struct *vma,
- struct dax_device *dax_dev)
+static inline bool daxdev_mapping_supported(vm_flags_t vm_flags,
+ struct file *file,
+ struct dax_device *dax_dev)
{
- if (!(vma->vm_flags & VM_SYNC))
+ if (!(vm_flags & VM_SYNC))
return true;
- if (!IS_DAX(file_inode(vma->vm_file)))
+ if (!IS_DAX(file_inode(file)))
return false;
return dax_synchronous(dax_dev);
}
@@ -110,10 +111,11 @@ static inline void set_dax_nomc(struct dax_device *dax_dev)
static inline void set_dax_synchronous(struct dax_device *dax_dev)
{
}
-static inline bool daxdev_mapping_supported(struct vm_area_struct *vma,
- struct dax_device *dax_dev)
+static inline bool daxdev_mapping_supported(vm_flags_t vm_flags,
+ struct file *file,
+ struct dax_device *dax_dev)
{
- return !(vma->vm_flags & VM_SYNC);
+ return !(vm_flags & VM_SYNC);
}
static inline size_t dax_recovery_write(struct dax_device *dax_dev,
pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i)
--
2.49.0
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