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dri-devel@lists.freedesktop.org, v9fs@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-afs@lists.infradead.org, linux-aio@kvack.org, linux-unionfs@vger.kernel.org, linux-bcachefs@vger.kernel.org, linux-mm@kvack.org, linux-btrfs@vger.kernel.org, ceph-devel@vger.kernel.org, codalist@coda.cs.cmu.edu, ecryptfs@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-um@lists.infradead.org, linux-mtd@lists.infradead.org, jfs-discussion@lists.sourceforge.net, linux-nfs@vger.kernel.org, linux-nilfs@vger.kernel.org, ntfs3@lists.linux.dev, ocfs2-devel@lists.linux.dev, linux-karma-devel@lists.sourceforge.net, devel@lists.orangefs.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-xfs@vger.kernel.org, nvdimm@lists.linux.dev Subject: [PATCH 07/10] mm/filemap: introduce generic_file_*_mmap_prepare() helpers Date: Mon, 16 Jun 2025 20:33:26 +0100 Message-ID: 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X-Proofpoint-GUID: LVImPUdswCVkrubLAU7BlRPxBhcsByBn X-Proofpoint-ORIG-GUID: LVImPUdswCVkrubLAU7BlRPxBhcsByBn Content-Type: text/plain; charset="utf-8" Since commit c84bf6dd2b83 ("mm: introduce new .mmap_prepare() file callback"), the f_op->mmap() hook has been deprecated in favour of f_op->mmap_prepare(). The generic mmap handlers are very simple, so we can very easily convert these in advance of converting file systems which use them. This patch does so. Signed-off-by: Lorenzo Stoakes Acked-by: Vlastimil Babka Reviewed-by: Jan Kara --- include/linux/fs.h | 6 ++++-- mm/filemap.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 33 insertions(+), 2 deletions(-) diff --git a/include/linux/fs.h b/include/linux/fs.h index 7120f80255b3..65cffc445fcc 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3395,8 +3395,10 @@ extern void inode_add_lru(struct inode *inode); extern int sb_set_blocksize(struct super_block *, int); extern int sb_min_blocksize(struct super_block *, int); =20 -extern int generic_file_mmap(struct file *, struct vm_area_struct *); -extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct= *); +int generic_file_mmap(struct file *, struct vm_area_struct *); +int generic_file_mmap_prepare(struct vm_area_desc *desc); +int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); +int generic_file_readonly_mmap_prepare(struct vm_area_desc *desc); extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *); int generic_write_checks_count(struct kiocb *iocb, loff_t *count); extern int generic_write_check_limits(struct file *file, loff_t pos, diff --git a/mm/filemap.c b/mm/filemap.c index 93fbc2ef232a..e75608cbf420 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -3847,6 +3847,18 @@ int generic_file_mmap(struct file *file, struct vm_a= rea_struct *vma) return 0; } =20 +int generic_file_mmap_prepare(struct vm_area_desc *desc) +{ + struct file *file =3D desc->file; + struct address_space *mapping =3D file->f_mapping; + + if (!mapping->a_ops->read_folio) + return -ENOEXEC; + file_accessed(file); + desc->vm_ops =3D &generic_file_vm_ops; + return 0; +} + /* * This is for filesystems which do not implement ->writepage. */ @@ -3856,6 +3868,13 @@ int generic_file_readonly_mmap(struct file *file, st= ruct vm_area_struct *vma) return -EINVAL; return generic_file_mmap(file, vma); } + +int generic_file_readonly_mmap_prepare(struct vm_area_desc *desc) +{ + if (is_shared_maywrite(desc->vm_flags)) + return -EINVAL; + return generic_file_mmap_prepare(desc); +} #else vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf) { @@ -3865,15 +3884,25 @@ int generic_file_mmap(struct file *file, struct vm_= area_struct *vma) { return -ENOSYS; } +int generic_file_mmap_prepare(struct vm_area_desc *desc) +{ + return -ENOSYS; +} int generic_file_readonly_mmap(struct file *file, struct vm_area_struct *v= ma) { return -ENOSYS; } +int generic_file_readonly_mmap_prepare(struct vm_area_desc *desc) +{ + return -ENOSYS; +} #endif /* CONFIG_MMU */ =20 EXPORT_SYMBOL(filemap_page_mkwrite); EXPORT_SYMBOL(generic_file_mmap); +EXPORT_SYMBOL(generic_file_mmap_prepare); EXPORT_SYMBOL(generic_file_readonly_mmap); +EXPORT_SYMBOL(generic_file_readonly_mmap_prepare); =20 static struct folio *do_read_cache_folio(struct address_space *mapping, pgoff_t index, filler_t filler, struct file *file, gfp_t gfp) --=20 2.49.0