[PATCH 2/5] mm: use new helper functions around the i_mmap_mutex

Davidlohr Bueso
2014-05-23T03:33:45Z

Convert all open coded mutex_lock/unlock calls to the
i_mmap_[lock/unlock]_write() helpers.

Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
---
fs/hugetlbfs/inode.c | 4 ++--
kernel/events/uprobes.c | 4 ++--
kernel/fork.c | 4 ++--
mm/filemap_xip.c | 4 ++--
mm/hugetlb.c | 12 ++++++------
mm/memory-failure.c | 4 ++--
mm/memory.c | 8 ++++----
mm/mmap.c | 14 +++++++-------
mm/mremap.c | 4 ++--
mm/nommu.c | 14 +++++++-------
mm/rmap.c | 4 ++--
11 files changed, 38 insertions(+), 38 deletions(-)

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 93fc531..bcaf4df 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -412,10 +412,10 @@ static int hugetlb_vmtruncate(struct inode *inode, loff_t offset)
pgoff = offset >> PAGE_SHIFT;

i_size_write(inode, offset);
- mutex_lock(&mapping->i_mmap_mutex);
+ i_mmap_lock_write(mapping);
if (!RB_EMPTY_ROOT(&mapping->i_mmap))
hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff);
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);
truncate_hugepages(inode, offset);
return 0;
}
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 7716c40..ccf793c 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -722,7 +722,7 @@ build_map_info(struct address_space *mapping, loff_t offset, bool is_register)
int more = 0;

again:
- mutex_lock(&mapping->i_mmap_mutex);
+ i_mmap_lock_write(mapping);
vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
if (!valid_vma(vma, is_register))
continue;
@@ -753,7 +753,7 @@ build_map_info(struct address_space *mapping, loff_t offset, bool is_register)
info->mm = vma->vm_mm;
info->vaddr = offset_to_vaddr(vma, offset);
}
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);

if (!more)
goto out;
diff --git a/kernel/fork.c b/kernel/fork.c
index d2799d1..76b1483 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -419,7 +419,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
get_file(file);
if (tmp->vm_flags & VM_DENYWRITE)
atomic_dec(&inode->i_writecount);
- mutex_lock(&mapping->i_mmap_mutex);
+ i_mmap_lock_write(mapping);
if (tmp->vm_flags & VM_SHARED)
mapping->i_mmap_writable++;
flush_dcache_mmap_lock(mapping);
@@ -431,7 +431,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
vma_interval_tree_insert_after(tmp, mpnt,
&mapping->i_mmap);
flush_dcache_mmap_unlock(mapping);
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);
}

/*
diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c
index d8d9fe3..bad746b 100644
--- a/mm/filemap_xip.c
+++ b/mm/filemap_xip.c
@@ -182,7 +182,7 @@ __xip_unmap (struct address_space * mapping,
return;

retry:
- mutex_lock(&mapping->i_mmap_mutex);
+ i_mmap_lock_write(mapping);
vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
mm = vma->vm_mm;
address = vma->vm_start +
@@ -202,7 +202,7 @@ retry:
page_cache_release(page);
}
}
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);

if (locked) {
mutex_unlock(&xip_sparse_mutex);
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 9519cde..161f98d 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2761,7 +2761,7 @@ static int unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma,
* this mapping should be shared between all the VMAs,
* __unmap_hugepage_range() is called as the lock is already held
*/
- mutex_lock(&mapping->i_mmap_mutex);
+ i_mmap_lock_write(mapping);
vma_interval_tree_foreach(iter_vma, &mapping->i_mmap, pgoff, pgoff) {
/* Do not unmap the current VMA */
if (iter_vma == vma)
@@ -2778,7 +2778,7 @@ static int unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma,
unmap_hugepage_range(iter_vma, address,
address + huge_page_size(h), page);
}
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);

return 1;
}
@@ -3342,7 +3342,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
flush_cache_range(vma, address, end);

mmu_notifier_invalidate_range_start(mm, start, end);
- mutex_lock(&vma->vm_file->f_mapping->i_mmap_mutex);
+ i_mmap_lock_write(vma->vm_file->f_mapping);
for (; address < end; address += huge_page_size(h)) {
spinlock_t *ptl;
ptep = huge_pte_offset(mm, address);
@@ -3370,7 +3370,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
* and that page table be reused and filled with junk.
*/
flush_tlb_range(vma, start, end);
- mutex_unlock(&vma->vm_file->f_mapping->i_mmap_mutex);
+ i_mmap_unlock_write(vma->vm_file->f_mapping);
mmu_notifier_invalidate_range_end(mm, start, end);

return pages << h->order;
@@ -3538,7 +3538,7 @@ pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud)
if (!vma_shareable(vma, addr))
return (pte_t *)pmd_alloc(mm, pud, addr);

- mutex_lock(&mapping->i_mmap_mutex);
+ i_mmap_lock_write(mapping);
vma_interval_tree_foreach(svma, &mapping->i_mmap, idx, idx) {
if (svma == vma)
continue;
@@ -3566,7 +3566,7 @@ pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud)
spin_unlock(ptl);
out:
pte = (pte_t *)pmd_alloc(mm, pud, addr);
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);
return pte;
}

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index e3154d9..1389a28 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -434,7 +434,7 @@ static void collect_procs_file(struct page *page, struct list_head *to_kill,
struct task_struct *tsk;
struct address_space *mapping = page->mapping;

- mutex_lock(&mapping->i_mmap_mutex);
+ i_mmap_lock_write(mapping);
read_lock(&tasklist_lock);
for_each_process(tsk) {
pgoff_t pgoff = page_pgoff(page);
@@ -456,7 +456,7 @@ static void collect_procs_file(struct page *page, struct list_head *to_kill,
}
}
read_unlock(&tasklist_lock);
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);
}

/*
diff --git a/mm/memory.c b/mm/memory.c
index e9a3c0f..815bcd9 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1340,9 +1340,9 @@ static void unmap_single_vma(struct mmu_gather *tlb,
* safe to do nothing in this case.
*/
if (vma->vm_file) {
- mutex_lock(&vma->vm_file->f_mapping->i_mmap_mutex);
+ i_mmap_lock_write(vma->vm_file->f_mapping);
__unmap_hugepage_range_final(tlb, vma, start, end, NULL);
- mutex_unlock(&vma->vm_file->f_mapping->i_mmap_mutex);
+ i_mmap_unlock_write(vma->vm_file->f_mapping);
}
} else
unmap_page_range(tlb, vma, start, end, details);
@@ -2387,12 +2387,12 @@ void unmap_mapping_range(struct address_space *mapping,
details.last_index = ULONG_MAX;

- mutex_lock(&mapping->i_mmap_mutex);
+ i_mmap_lock_write(mapping);
if (unlikely(!RB_EMPTY_ROOT(&mapping->i_mmap)))
unmap_mapping_range_tree(&mapping->i_mmap, &details);
if (unlikely(!list_empty(&mapping->i_mmap_nonlinear)))
unmap_mapping_range_list(&mapping->i_mmap_nonlinear, &details);
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);
}
EXPORT_SYMBOL(unmap_mapping_range);

diff --git a/mm/mmap.c b/mm/mmap.c
index da3c212..41a0083 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -236,9 +236,9 @@ void unlink_file_vma(struct vm_area_struct *vma)

if (file) {
struct address_space *mapping = file->f_mapping;
- mutex_lock(&mapping->i_mmap_mutex);
+ i_mmap_lock_write(mapping);
__remove_shared_vm_struct(vma, file, mapping);
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);
}
}

@@ -645,14 +645,14 @@ static void vma_link(struct mm_struct *mm, struct vm_area_struct *vma,

if (vma->vm_file) {
mapping = vma->vm_file->f_mapping;
- mutex_lock(&mapping->i_mmap_mutex);
+ i_mmap_lock_write(mapping);
}

__vma_link(mm, vma, prev, rb_link, rb_parent);
__vma_link_file(vma);

if (mapping)
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);

mm->map_count++;
validate_mm(mm);
@@ -764,7 +764,7 @@ again: remove_next = 1 + (end > next->vm_end);
next->vm_end);
}

- mutex_lock(&mapping->i_mmap_mutex);
+ i_mmap_lock_write(mapping);
if (insert) {
/*
* Put into interval tree now, so instantiated pages
@@ -851,7 +851,7 @@ again: remove_next = 1 + (end > next->vm_end);
anon_vma_unlock_write(anon_vma);
}
if (mapping)
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);

if (root) {
uprobe_mmap(vma);
@@ -3174,7 +3174,7 @@ static void vm_unlock_mapping(struct address_space *mapping)
* AS_MM_ALL_LOCKS can't change to 0 from under us
* because we hold the mm_all_locks_mutex.
*/
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);
if (!test_and_clear_bit(AS_MM_ALL_LOCKS,
&mapping->flags))
BUG();
diff --git a/mm/mremap.c b/mm/mremap.c
index 05f1180..60259a2 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -119,7 +119,7 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
if (need_rmap_locks) {
if (vma->vm_file) {
mapping = vma->vm_file->f_mapping;
- mutex_lock(&mapping->i_mmap_mutex);
+ i_mmap_lock_write(mapping);
}
if (vma->anon_vma) {
anon_vma = vma->anon_vma;
@@ -156,7 +156,7 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
if (anon_vma)
anon_vma_unlock_write(anon_vma);
if (mapping)
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);
}

#define LATENCY_LIMIT (64 * PAGE_SIZE)
diff --git a/mm/nommu.c b/mm/nommu.c
index e6ced9d..52047c4 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -722,11 +722,11 @@ static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
if (vma->vm_file) {
mapping = vma->vm_file->f_mapping;

- mutex_lock(&mapping->i_mmap_mutex);
+ i_mmap_lock_write(mapping);
flush_dcache_mmap_lock(mapping);
vma_interval_tree_insert(vma, &mapping->i_mmap);
flush_dcache_mmap_unlock(mapping);
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);
}

/* add the VMA to the tree */
@@ -795,11 +795,11 @@ static void delete_vma_from_mm(struct vm_area_struct *vma)
if (vma->vm_file) {
mapping = vma->vm_file->f_mapping;

- mutex_lock(&mapping->i_mmap_mutex);
+ i_mmap_lock_write(mapping);
flush_dcache_mmap_lock(mapping);
vma_interval_tree_remove(vma, &mapping->i_mmap);
flush_dcache_mmap_unlock(mapping);
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);
}

/* remove from the MM's tree and list */
@@ -2091,14 +2091,14 @@ int nommu_shrink_inode_mappings(struct inode *inode, size_t size,
high = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;

down_write(&nommu_region_sem);
- mutex_lock(&inode->i_mapping->i_mmap_mutex);
+ i_mmap_lock_write(inode->i_mapping);

/* search for VMAs that fall within the dead zone */
vma_interval_tree_foreach(vma, &inode->i_mapping->i_mmap, low, high) {
/* found one - only interested if it's shared out of the page
* cache */
if (vma->vm_flags & VM_SHARED) {
- mutex_unlock(&inode->i_mapping->i_mmap_mutex);
+ i_mmap_unlock_write(inode->i_mapping);
up_write(&nommu_region_sem);
return -ETXTBSY; /* not quite true, but near enough */
}
@@ -2126,7 +2126,7 @@ int nommu_shrink_inode_mappings(struct inode *inode, size_t size,
}
}

- mutex_unlock(&inode->i_mapping->i_mmap_mutex);
+ i_mmap_unlock_write(inode->i_mapping);
up_write(&nommu_region_sem);
return 0;
}
diff --git a/mm/rmap.c b/mm/rmap.c
index 3333baa..9a56e4f 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1685,7 +1685,7 @@ static int rmap_walk_file(struct page *page, struct rmap_walk_control *rwc)

if (!mapping)
return ret;
- mutex_lock(&mapping->i_mmap_mutex);
+ i_mmap_lock_write(mapping);
vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
unsigned long address = vma_address(page, vma);

@@ -1708,7 +1708,7 @@ static int rmap_walk_file(struct page *page, struct rmap_walk_control *rwc)
ret = rwc->file_nonlinear(page, mapping, rwc->arg);

done:
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);
return ret;
}

--
1.8.1.4