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mm/mmap.c: pass in mapping to __vma_link_file()

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__vma_link_file() resolves the mapping from the file, if there is one.
Pass through the mapping and check the vm_file externally since most
places already have the required information and check of vm_file.

Link: https://lkml.kernel.org/r/20220906194824.2110408-71-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Tested-by: Yu Zhao <yuzhao@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2022-09-06 19:49:06 +00:00 committed by Andrew Morton
parent d0601a500c
commit c154124fe9
1 changed files with 12 additions and 17 deletions
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29
mm/mmap.c
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@ -407,21 +407,15 @@ static unsigned long count_vma_pages_range(struct mm_struct *mm,
return nr_pages;
}
static void __vma_link_file(struct vm_area_struct *vma)
static void __vma_link_file(struct vm_area_struct *vma,
struct address_space *mapping)
{
struct file *file;
if (vma->vm_flags & VM_SHARED)
mapping_allow_writable(mapping);
file = vma->vm_file;
if (file) {
struct address_space *mapping = file->f_mapping;
if (vma->vm_flags & VM_SHARED)
mapping_allow_writable(mapping);
flush_dcache_mmap_lock(mapping);
vma_interval_tree_insert(vma, &mapping->i_mmap);
flush_dcache_mmap_unlock(mapping);
}
flush_dcache_mmap_lock(mapping);
vma_interval_tree_insert(vma, &mapping->i_mmap);
flush_dcache_mmap_unlock(mapping);
}
/*
@ -488,10 +482,11 @@ static int vma_link(struct mm_struct *mm, struct vm_area_struct *vma)
}
vma_mas_store(vma, &mas);
__vma_link_file(vma);
if (mapping)
if (mapping) {
__vma_link_file(vma, mapping);
i_mmap_unlock_write(mapping);
}
mm->map_count++;
validate_mm(mm);
@ -730,14 +725,14 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start,
uprobe_munmap(next, next->vm_start, next->vm_end);
i_mmap_lock_write(mapping);
if (insert) {
if (insert && insert->vm_file) {
/*
* Put into interval tree now, so instantiated pages
* are visible to arm/parisc __flush_dcache_page
* throughout; but we cannot insert into address
* space until vma start or end is updated.
*/
__vma_link_file(insert);
__vma_link_file(insert, insert->vm_file->f_mapping);
}
}