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Miller" , Andreas Larsson , Arnd Bergmann , Greg Kroah-Hartman , Dan Williams , Vishal Verma , Dave Jiang , Nicolas Pitre , Muchun Song , Oscar Salvador , David Hildenbrand , Konstantin Komarov , Baoquan He , Vivek Goyal , Dave Young , Tony Luck , Reinette Chatre , Dave Martin , James Morse , Alexander Viro , Christian Brauner , Jan Kara , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Hugh Dickins , Baolin Wang , Uladzislau Rezki , Dmitry Vyukov , Andrey Konovalov , Jann Horn , Pedro Falcato , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-csky@vger.kernel.org, linux-mips@vger.kernel.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-mm@kvack.org, ntfs3@lists.linux.dev, kexec@lists.infradead.org, kasan-dev@googlegroups.com, Jason Gunthorpe Subject: [PATCH v2 13/16] mm: update cramfs to use mmap_prepare Date: Wed, 10 Sep 2025 21:22:08 +0100 Message-ID: <0b1cefb4e4021e95902d08c7a43a3033d1e3a4d9.1757534913.git.lorenzo.stoakes@oracle.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: References: Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: GVZP280CA0055.SWEP280.PROD.OUTLOOK.COM (2603:10a6:150:271::12) To DM4PR10MB8218.namprd10.prod.outlook.com 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owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: cramfs uses either a PFN remap or a mixedmap insertion, we are able to determine this at the point of mmap_prepare and to select the appropriate action to perform using the vm_area_desc. Note that there appears to have been a bug in this code, with the physical address being specified as the PFN (!!) to vmf_insert_mixed(). This patch fixes this issue. Finally, we trivially have to update the pr_debug() message indicating what's happening to occur before the remap/mixedmap occurs. Signed-off-by: Lorenzo Stoakes --- fs/cramfs/inode.c | 46 ++++++++++++++++++++-------------------------- 1 file changed, 20 insertions(+), 26 deletions(-) diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c index b002e9b734f9..2a41b30753a7 100644 --- a/fs/cramfs/inode.c +++ b/fs/cramfs/inode.c @@ -342,16 +342,17 @@ static bool cramfs_last_page_is_shared(struct inode *inode) return memchr_inv(tail_data, 0, PAGE_SIZE - partial) ? true : false; } -static int cramfs_physmem_mmap(struct file *file, struct vm_area_struct *vma) +static int cramfs_physmem_mmap_prepare(struct vm_area_desc *desc) { + struct file *file = desc->file; struct inode *inode = file_inode(file); struct cramfs_sb_info *sbi = CRAMFS_SB(inode->i_sb); unsigned int pages, max_pages, offset; - unsigned long address, pgoff = vma->vm_pgoff; + unsigned long address, pgoff = desc->pgoff; char *bailout_reason; int ret; - ret = generic_file_readonly_mmap(file, vma); + ret = generic_file_readonly_mmap_prepare(desc); if (ret) return ret; @@ -362,14 +363,14 @@ static int cramfs_physmem_mmap(struct file *file, struct vm_area_struct *vma) /* Could COW work here? */ bailout_reason = "vma is writable"; - if (vma->vm_flags & VM_WRITE) + if (desc->vm_flags & VM_WRITE) goto bailout; max_pages = (inode->i_size + PAGE_SIZE - 1) >> PAGE_SHIFT; bailout_reason = "beyond file limit"; if (pgoff >= max_pages) goto bailout; - pages = min(vma_pages(vma), max_pages - pgoff); + pages = min(vma_desc_pages(desc), max_pages - pgoff); offset = cramfs_get_block_range(inode, pgoff, &pages); bailout_reason = "unsuitable block layout"; @@ -391,38 +392,31 @@ static int cramfs_physmem_mmap(struct file *file, struct vm_area_struct *vma) goto bailout; } - if (pages == vma_pages(vma)) { + pr_debug("mapping %pD[%lu] at 0x%08lx (%u/%lu pages) " + "to vma 0x%08lx, page_prot 0x%llx\n", file, + pgoff, address, pages, vma_desc_pages(desc), desc->start, + (unsigned long long)pgprot_val(desc->page_prot)); + + if (pages == vma_desc_pages(desc)) { /* * The entire vma is mappable. remap_pfn_range() will * make it distinguishable from a non-direct mapping * in /proc//maps by substituting the file offset * with the actual physical address. */ - ret = remap_pfn_range(vma, vma->vm_start, address >> PAGE_SHIFT, - pages * PAGE_SIZE, vma->vm_page_prot); + mmap_action_remap(&desc->action, desc->start, + address >> PAGE_SHIFT, pages * PAGE_SIZE, + desc->page_prot); } else { /* * Let's create a mixed map if we can't map it all. * The normal paging machinery will take care of the * unpopulated ptes via cramfs_read_folio(). */ - int i; - vm_flags_set(vma, VM_MIXEDMAP); - for (i = 0; i < pages && !ret; i++) { - vm_fault_t vmf; - unsigned long off = i * PAGE_SIZE; - vmf = vmf_insert_mixed(vma, vma->vm_start + off, - address + off); - if (vmf & VM_FAULT_ERROR) - ret = vm_fault_to_errno(vmf, 0); - } + mmap_action_mixedmap(&desc->action, desc->start, + address >> PAGE_SHIFT, pages); } - if (!ret) - pr_debug("mapped %pD[%lu] at 0x%08lx (%u/%lu pages) " - "to vma 0x%08lx, page_prot 0x%llx\n", file, - pgoff, address, pages, vma_pages(vma), vma->vm_start, - (unsigned long long)pgprot_val(vma->vm_page_prot)); return ret; bailout: @@ -434,9 +428,9 @@ static int cramfs_physmem_mmap(struct file *file, struct vm_area_struct *vma) #else /* CONFIG_MMU */ -static int cramfs_physmem_mmap(struct file *file, struct vm_area_struct *vma) +static int cramfs_physmem_mmap_prepare(struct vm_area_desc *desc) { - return is_nommu_shared_mapping(vma->vm_flags) ? 0 : -ENOSYS; + return is_nommu_shared_mapping(desc->vm_flags) ? 0 : -ENOSYS; } static unsigned long cramfs_physmem_get_unmapped_area(struct file *file, @@ -474,7 +468,7 @@ static const struct file_operations cramfs_physmem_fops = { .llseek = generic_file_llseek, .read_iter = generic_file_read_iter, .splice_read = filemap_splice_read, - .mmap = cramfs_physmem_mmap, + .mmap_prepare = cramfs_physmem_mmap_prepare, #ifndef CONFIG_MMU .get_unmapped_area = cramfs_physmem_get_unmapped_area, .mmap_capabilities = cramfs_physmem_mmap_capabilities, -- 2.51.0