C++ down_write_nested函数代码示例

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本文整理汇总了C++中down_write_nested函数的典型用法代码示例。如果您正苦于以下问题：C++ down_write_nested函数的具体用法？C++ down_write_nested怎么用？C++ down_write_nested使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。

在下文中一共展示了down_write_nested函数的10个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: omapfb_setup_mem

static int omapfb_setup_mem(struct fb_info *fbi, struct omapfb_mem_info *mi)
{
    struct omapfb_info *ofbi = FB2OFB(fbi);
    struct omapfb2_device *fbdev = ofbi->fbdev;
    struct omap_dss_device *display = fb2display(fbi);
    struct omapfb2_mem_region *rg;
    int r = 0, i;
    size_t size;

    if (mi->type != OMAPFB_MEMTYPE_SDRAM)
        return -EINVAL;

    size = PAGE_ALIGN(mi->size);

    if (display && display->driver->sync)
        display->driver->sync(display);

    rg = ofbi->region;

    down_write_nested(&rg->lock, rg->id);
    atomic_inc(&rg->lock_count);

    if (rg->size == size && rg->type == mi->type)
        goto out;

    if (atomic_read(&rg->map_count)) {
        r = -EBUSY;
        goto out;
    }

    for (i = 0; i < fbdev->num_fbs; i++) {
        struct omapfb_info *ofbi2 = FB2OFB(fbdev->fbs[i]);
        int j;

        if (ofbi2->region != rg)
            continue;

        for (j = 0; j < ofbi2->num_overlays; j++) {
            struct omap_overlay *ovl;
            ovl = ofbi2->overlays[j];
            if (ovl->is_enabled(ovl)) {
                r = -EBUSY;
                goto out;
            }
        }
    }

    r = omapfb_realloc_fbmem(fbi, size, mi->type);
    if (r) {
        dev_err(fbdev->dev, "realloc fbmem failed\n");
        goto out;
    }

out:
    atomic_dec(&rg->lock_count);
    up_write(&rg->lock);

    return r;
}

开发者ID:mhei，项目名称:linux，代码行数:59，代码来源:omapfb-ioctl.c

示例2: osd_object_write_lock

static void osd_object_write_lock(const struct lu_env *env,
				  struct dt_object *dt, unsigned role)
{
	struct osd_object *obj = osd_dt_obj(dt);

	LASSERT(osd_invariant(obj));

	down_write_nested(&obj->oo_sem, role);
}

开发者ID:sdsc，项目名称:lustre-release，代码行数:9，代码来源:osd_object.c

示例3: osp_md_object_write_lock

/**
 * Implementation of dt_object_operations::do_write_lock
 *
 * Lock the remote object in write mode.
 *
 * \param[in] env	execution environment
 * \param[in] dt	object to be locked
 * \param[in] role	lock role from MDD layer, see mdd_object_role().
 */
static void osp_md_object_write_lock(const struct lu_env *env,
				     struct dt_object *dt, unsigned role)
{
	struct osp_object *obj = dt2osp_obj(dt);

	down_write_nested(&obj->opo_sem, role);

	LASSERT(obj->opo_owner == NULL);
	obj->opo_owner = env;
}

开发者ID:Keeper-of-the-Keys，项目名称:Lustre，代码行数:19，代码来源:osp_md_object.c

示例4: dup_mmap

static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
{
	struct vm_area_struct *mpnt, *tmp, **pprev;
	struct rb_node **rb_link, *rb_parent;
	int retval;
	unsigned long charge;
	struct mempolicy *pol;

	down_write(&oldmm->mmap_sem);
	flush_cache_dup_mm(oldmm);
	/*
	 * Not linked in yet - no deadlock potential:
	 */
	down_write_nested(&mm->mmap_sem, SINGLE_DEPTH_NESTING);

	mm->locked_vm = 0;
	mm->mmap = NULL;
	mm->mmap_cache = NULL;
	mm->free_area_cache = oldmm->mmap_base;
	mm->cached_hole_size = ~0UL;
	mm->map_count = 0;
	cpumask_clear(mm_cpumask(mm));
	mm->mm_rb = RB_ROOT;
	rb_link = &mm->mm_rb.rb_node;
	rb_parent = NULL;
	pprev = &mm->mmap;
	retval = ksm_fork(mm, oldmm);
	if (retval)
		goto out;

	for (mpnt = oldmm->mmap; mpnt; mpnt = mpnt->vm_next) {
		struct file *file;

		if (mpnt->vm_flags & VM_DONTCOPY) {
			long pages = vma_pages(mpnt);
			mm->total_vm -= pages;
			vm_stat_account(mm, mpnt->vm_flags, mpnt->vm_file,
								-pages);
			continue;
		}
		charge = 0;
		if (mpnt->vm_flags & VM_ACCOUNT) {
			unsigned int len = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;
			if (security_vm_enough_memory(len))
				goto fail_nomem;
			charge = len;
		}
		tmp = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
		if (!tmp)
			goto fail_nomem;
		*tmp = *mpnt;
		pol = mpol_dup(vma_policy(mpnt));
		retval = PTR_ERR(pol);
		if (IS_ERR(pol))
			goto fail_nomem_policy;
		vma_set_policy(tmp, pol);
		tmp->vm_flags &= ~VM_LOCKED;
		tmp->vm_mm = mm;
		tmp->vm_next = NULL;
		anon_vma_link(tmp);
		file = tmp->vm_file;
		if (file) {
			struct inode *inode = file->f_path.dentry->d_inode;
			struct address_space *mapping = file->f_mapping;

			get_file(file);
			if (tmp->vm_flags & VM_DENYWRITE)
				atomic_dec(&inode->i_writecount);
			spin_lock(&mapping->i_mmap_lock);
			if (tmp->vm_flags & VM_SHARED)
				mapping->i_mmap_writable++;
			tmp->vm_truncate_count = mpnt->vm_truncate_count;
			flush_dcache_mmap_lock(mapping);
			/* insert tmp into the share list, just after mpnt */
			vma_prio_tree_add(tmp, mpnt);
			flush_dcache_mmap_unlock(mapping);
			spin_unlock(&mapping->i_mmap_lock);
		}

		/*
		 * Clear hugetlb-related page reserves for children. This only
		 * affects MAP_PRIVATE mappings. Faults generated by the child
		 * are not guaranteed to succeed, even if read-only
		 */
		if (is_vm_hugetlb_page(tmp))
			reset_vma_resv_huge_pages(tmp);

		/*
		 * Link in the new vma and copy the page table entries.
		 */
		*pprev = tmp;
		pprev = &tmp->vm_next;

		__vma_link_rb(mm, tmp, rb_link, rb_parent);
		rb_link = &tmp->vm_rb.rb_right;
		rb_parent = &tmp->vm_rb;

		mm->map_count++;
		retval = copy_page_range(mm, oldmm, mpnt);

//.........这里部分代码省略.........

开发者ID:genua，项目名称:anoubis_os，代码行数:101，代码来源:fork.c

示例5: dup_mmap

static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
{
	struct vm_area_struct *mpnt, *tmp, *prev, **pprev;
	struct rb_node **rb_link, *rb_parent;
	int retval;
	unsigned long charge;

	uprobe_start_dup_mmap();
	down_write(&oldmm->mmap_sem);
	flush_cache_dup_mm(oldmm);
	uprobe_dup_mmap(oldmm, mm);
	/*
	 * Not linked in yet - no deadlock potential:
	 */
	down_write_nested(&mm->mmap_sem, SINGLE_DEPTH_NESTING);

	/* No ordering required: file already has been exposed. */
	RCU_INIT_POINTER(mm->exe_file, get_mm_exe_file(oldmm));

	mm->total_vm = oldmm->total_vm;
	mm->shared_vm = oldmm->shared_vm;
	mm->exec_vm = oldmm->exec_vm;
	mm->stack_vm = oldmm->stack_vm;

	rb_link = &mm->mm_rb.rb_node;
	rb_parent = NULL;
	pprev = &mm->mmap;
	retval = ksm_fork(mm, oldmm);
	if (retval)
		goto out;
	retval = khugepaged_fork(mm, oldmm);
	if (retval)
		goto out;

	prev = NULL;
	for (mpnt = oldmm->mmap; mpnt; mpnt = mpnt->vm_next) {
		struct file *file;

		if (mpnt->vm_flags & VM_DONTCOPY) {
			vm_stat_account(mm, mpnt->vm_flags, mpnt->vm_file,
							-vma_pages(mpnt));
			continue;
		}
		charge = 0;
		if (mpnt->vm_flags & VM_ACCOUNT) {
			unsigned long len = vma_pages(mpnt);

			if (security_vm_enough_memory_mm(oldmm, len)) /* sic */
				goto fail_nomem;
			charge = len;
		}
		tmp = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
		if (!tmp)
			goto fail_nomem;
		*tmp = *mpnt;
		INIT_LIST_HEAD(&tmp->anon_vma_chain);
		retval = vma_dup_policy(mpnt, tmp);
		if (retval)
			goto fail_nomem_policy;
		tmp->vm_mm = mm;
		if (anon_vma_fork(tmp, mpnt))
			goto fail_nomem_anon_vma_fork;
		tmp->vm_flags &= ~VM_LOCKED;
		tmp->vm_next = tmp->vm_prev = NULL;
		file = tmp->vm_file;
		if (file) {
			struct inode *inode = file_inode(file);
			struct address_space *mapping = file->f_mapping;

			get_file(file);
			if (tmp->vm_flags & VM_DENYWRITE)
				atomic_dec(&inode->i_writecount);
			i_mmap_lock_write(mapping);
			if (tmp->vm_flags & VM_SHARED)
				atomic_inc(&mapping->i_mmap_writable);
			flush_dcache_mmap_lock(mapping);
			/* insert tmp into the share list, just after mpnt */
			vma_interval_tree_insert_after(tmp, mpnt,
					&mapping->i_mmap);
			flush_dcache_mmap_unlock(mapping);
			i_mmap_unlock_write(mapping);
		}

		/*
		 * Clear hugetlb-related page reserves for children. This only
		 * affects MAP_PRIVATE mappings. Faults generated by the child
		 * are not guaranteed to succeed, even if read-only
		 */
		if (is_vm_hugetlb_page(tmp))
			reset_vma_resv_huge_pages(tmp);

		/*
		 * Link in the new vma and copy the page table entries.
		 */
		*pprev = tmp;
		pprev = &tmp->vm_next;
		tmp->vm_prev = prev;
		prev = tmp;

		__vma_link_rb(mm, tmp, rb_link, rb_parent);
//.........这里部分代码省略.........

开发者ID:19Dan01，项目名称:linux，代码行数:101，代码来源:fork.c

示例6: dup_mmap

static inline int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
{
	struct vm_area_struct *mpnt, *tmp, **pprev;
	struct rb_node **rb_link, *rb_parent;
	int retval;
	unsigned long charge;
	struct mempolicy *pol;

	down_write(&oldmm->mmap_sem);
	flush_cache_mm(oldmm);
	/*
	 * Not linked in yet - no deadlock potential:
	 */
	down_write_nested(&mm->mmap_sem, SINGLE_DEPTH_NESTING);

	mm->locked_vm = 0;
	mm->mmap = NULL;
	mm->mmap_cache = NULL;
	mm->free_area_cache = oldmm->mmap_base;
	mm->cached_hole_size = ~0UL;
	mm->map_count = 0;
	cpus_clear(mm->cpu_vm_mask);
	mm->mm_rb = RB_ROOT;
	rb_link = &mm->mm_rb.rb_node;
	rb_parent = NULL;
	pprev = &mm->mmap;

	for (mpnt = oldmm->mmap; mpnt; mpnt = mpnt->vm_next) {
		struct file *file;

		if (mpnt->vm_flags & VM_DONTCOPY) {
			long pages = vma_pages(mpnt);
			mm->total_vm -= pages;
			vm_stat_account(mm, mpnt->vm_flags, mpnt->vm_file,
								-pages);
			continue;
		}
		charge = 0;
		if (mpnt->vm_flags & VM_ACCOUNT) {
			unsigned int len = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;
			if (security_vm_enough_memory(len))
				goto fail_nomem;
			charge = len;
		}
		tmp = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
		if (!tmp)
			goto fail_nomem;
		*tmp = *mpnt;
		pol = mpol_copy(vma_policy(mpnt));
		retval = PTR_ERR(pol);
		if (IS_ERR(pol))
			goto fail_nomem_policy;
		vma_set_policy(tmp, pol);
		tmp->vm_flags &= ~VM_LOCKED;
		tmp->vm_mm = mm;
		tmp->vm_next = NULL;
		anon_vma_link(tmp);
		file = tmp->vm_file;
		if (file) {
			struct inode *inode = file->f_dentry->d_inode;
			get_file(file);
			if (tmp->vm_flags & VM_DENYWRITE)
				atomic_dec(&inode->i_writecount);
      
			/* insert tmp into the share list, just after mpnt */
			spin_lock(&file->f_mapping->i_mmap_lock);
			tmp->vm_truncate_count = mpnt->vm_truncate_count;
			flush_dcache_mmap_lock(file->f_mapping);
			vma_prio_tree_add(tmp, mpnt);
			flush_dcache_mmap_unlock(file->f_mapping);
			spin_unlock(&file->f_mapping->i_mmap_lock);
		}

		/*
		 * Link in the new vma and copy the page table entries.
		 */
		*pprev = tmp;
		pprev = &tmp->vm_next;

		__vma_link_rb(mm, tmp, rb_link, rb_parent);
		rb_link = &tmp->vm_rb.rb_right;
		rb_parent = &tmp->vm_rb;

		mm->map_count++;
		retval = copy_page_range(mm, oldmm, mpnt);

		if (tmp->vm_ops && tmp->vm_ops->open)
			tmp->vm_ops->open(tmp);

		if (retval)
			goto out;
	}

开发者ID:FatSunHYS，项目名称:OSCourseDesign，代码行数:92，代码来源:fork.c

示例7: store_size

static ssize_t store_size(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct fb_info *fbi = dev_get_drvdata(dev);
	struct omapfb_info *ofbi = FB2OFB(fbi);
	struct omapfb2_device *fbdev = ofbi->fbdev;
	struct omap_dss_device *display = fb2display(fbi);
	struct omapfb2_mem_region *rg;
	unsigned long size;
	int r;
	int i;

	r = kstrtoul(buf, 0, &size);
	if (r)
		return r;

	size = PAGE_ALIGN(size);

	if (!lock_fb_info(fbi))
		return -ENODEV;

	if (display && display->driver->sync)
		display->driver->sync(display);

	rg = ofbi->region;

	down_write_nested(&rg->lock, rg->id);
	atomic_inc(&rg->lock_count);

	if (atomic_read(&rg->map_count)) {
		r = -EBUSY;
		goto out;
	}

	for (i = 0; i < fbdev->num_fbs; i++) {
		struct omapfb_info *ofbi2 = FB2OFB(fbdev->fbs[i]);
		int j;

		if (ofbi2->region != rg)
			continue;

		for (j = 0; j < ofbi2->num_overlays; j++) {
			struct omap_overlay *ovl;
			ovl = ofbi2->overlays[j];
			if (ovl->is_enabled(ovl)) {
				r = -EBUSY;
				goto out;
			}
		}
	}

	if (size != ofbi->region->size) {
		r = omapfb_realloc_fbmem(fbi, size, ofbi->region->type);
		if (r) {
			dev_err(dev, "realloc fbmem failed\n");
			goto out;
		}
	}

	r = count;
out:
	atomic_dec(&rg->lock_count);
	up_write(&rg->lock);

	unlock_fb_info(fbi);

	return r;
}

开发者ID:mikuhatsune001，项目名称:linux2.6.32，代码行数:68，代码来源:omapfb-sysfs.c

示例8: dup_mmap

static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
{
	struct vm_area_struct *mpnt, *tmp, *prev, **pprev;
	struct rb_node **rb_link, *rb_parent;
	int retval;
	unsigned long charge;
	struct mempolicy *pol;

	down_write(&oldmm->mmap_sem);
	flush_cache_dup_mm(oldmm);
	uprobe_dup_mmap(oldmm, mm);
	/*
	 * Not linked in yet - no deadlock potential:
	 */
	down_write_nested(&mm->mmap_sem, SINGLE_DEPTH_NESTING);

	mm->locked_vm = 0;
	mm->mmap = NULL;
	mm->mmap_cache = NULL;
	mm->free_area_cache = oldmm->mmap_base;
	mm->cached_hole_size = ~0UL;
	mm->map_count = 0;
	cpumask_clear(mm_cpumask(mm));
	mm->mm_rb = RB_ROOT;
	rb_link = &mm->mm_rb.rb_node;
	rb_parent = NULL;
	pprev = &mm->mmap;
	retval = ksm_fork(mm, oldmm);
	if (retval)
		goto out;
	retval = khugepaged_fork(mm, oldmm);
	if (retval)
		goto out;

	prev = NULL;
	for (mpnt = oldmm->mmap; mpnt; mpnt = mpnt->vm_next) {
		struct file *file;

		if (mpnt->vm_flags & VM_DONTCOPY) {
			vm_stat_account(mm, mpnt->vm_flags, mpnt->vm_file,
							-vma_pages(mpnt));
			continue;
		}
		charge = 0;
		if (mpnt->vm_flags & VM_ACCOUNT) {
			unsigned long len = vma_pages(mpnt);

			if (security_vm_enough_memory_mm(oldmm, len)) /* sic */
				goto fail_nomem;
			charge = len;
		}
		tmp = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
		if (!tmp)
			goto fail_nomem;
		*tmp = *mpnt;
		INIT_LIST_HEAD(&tmp->anon_vma_chain);
		pol = mpol_dup(vma_policy(mpnt));
		retval = PTR_ERR(pol);
		if (IS_ERR(pol))
			goto fail_nomem_policy;
		vma_set_policy(tmp, pol);
		tmp->vm_mm = mm;
		if (anon_vma_fork(tmp, mpnt))
			goto fail_nomem_anon_vma_fork;
		tmp->vm_flags &= ~VM_LOCKED;
		tmp->vm_next = tmp->vm_prev = NULL;
		file = tmp->vm_file;
		if (file) {
			struct inode *inode = file->f_path.dentry->d_inode;
			struct address_space *mapping = file->f_mapping;

			get_file(file);
			if (tmp->vm_prfile)
				get_file(tmp->vm_prfile);
			if (tmp->vm_flags & VM_DENYWRITE)
				atomic_dec(&inode->i_writecount);
			mutex_lock(&mapping->i_mmap_mutex);
			if (tmp->vm_flags & VM_SHARED)
				mapping->i_mmap_writable++;
			flush_dcache_mmap_lock(mapping);
			/* insert tmp into the share list, just after mpnt */
			if (unlikely(tmp->vm_flags & VM_NONLINEAR))
				vma_nonlinear_insert(tmp,
						&mapping->i_mmap_nonlinear);
			else
				vma_interval_tree_insert_after(tmp, mpnt,
							&mapping->i_mmap);
			flush_dcache_mmap_unlock(mapping);
			mutex_unlock(&mapping->i_mmap_mutex);
		}

		/*
		 * Clear hugetlb-related page reserves for children. This only
		 * affects MAP_PRIVATE mappings. Faults generated by the child
		 * are not guaranteed to succeed, even if read-only
		 */
		if (is_vm_hugetlb_page(tmp))
			reset_vma_resv_huge_pages(tmp);

		/*
//.........这里部分代码省略.........

开发者ID:hexianren，项目名称:linux-3.7-Read，代码行数:101，代码来源:fork.c

示例9: allocate_mm

/*
 * Allocate a new mm structure and copy contents from the
 * mm structure of the passed in task structure.
 */
struct mm_struct *dup_mm(struct task_struct *tsk)
{
	struct mm_struct *mm, *oldmm = current->mm;
	int err;

	if (!oldmm)
		return NULL;

	mm = allocate_mm();
	if (!mm)
		goto fail_nomem;

	memcpy(mm, oldmm, sizeof(*mm));
	mm_init_cpumask(mm);

	/* Initializing for Swap token stuff */
	mm->token_priority = 0;
	mm->last_interval = 0;

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	mm->pmd_huge_pte = NULL;
#endif
	uprobe_reset_state(mm);

	if (!mm_init(mm, tsk))
		goto fail_nomem;

	if (init_new_context(tsk, mm))
		goto fail_nocontext;

	dup_mm_exe_file(oldmm, mm);

	err = dup_mmap(mm, oldmm);
	if (err)
		goto free_pt;

#ifdef CONFIG_HOMECACHE
	{
		/* Reset vm_pid on all vmas.  In the new mm_struct, we
		 * want to switch anything that was associated with
		 * the parent to be associated with the child, and
		 * clear everything else.
		 */
		struct vm_area_struct *mpnt;
		down_write_nested(&mm->mmap_sem, SINGLE_DEPTH_NESTING);
		for (mpnt = mm->mmap; mpnt; mpnt = mpnt->vm_next) {
			if (mpnt->vm_pid == current->pid)
				mpnt->vm_pid = tsk->pid;
			else
				mpnt->vm_pid = 0;
		}
		up_write(&mm->mmap_sem);
	}
#endif

	mm->hiwater_rss = get_mm_rss(mm);
	mm->hiwater_vm = mm->total_vm;

	if (mm->binfmt && !try_module_get(mm->binfmt->module))
		goto free_pt;

	return mm;

free_pt:
	/* don't put binfmt in mmput, we haven't got module yet */
	mm->binfmt = NULL;
	mmput(mm);

fail_nomem:
	return NULL;

fail_nocontext:
	/*
	 * If init_new_context() failed, we cannot use mmput() to free the mm
	 * because it calls destroy_context()
	 */
	mm_free_pgd(mm);
	free_mm(mm);
	return NULL;
}

开发者ID:tcreech，项目名称:tilegx-linux-3.4.68-politestackrehome，代码行数:84，代码来源:fork.c

示例10: dup_mmap

static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
{
	struct vm_area_struct *mpnt, *tmp, *prev, **pprev;
	struct rb_node **rb_link, *rb_parent;
	int retval;
	unsigned long charge;
	struct mempolicy *pol;

	down_write(&oldmm->mmap_sem);
	flush_cache_dup_mm(oldmm);
	down_write_nested(&mm->mmap_sem, SINGLE_DEPTH_NESTING);

	mm->locked_vm = 0;
	mm->mmap = NULL;
	mm->mmap_cache = NULL;
	mm->free_area_cache = oldmm->mmap_base;
	mm->cached_hole_size = ~0UL;
	mm->map_count = 0;
	cpumask_clear(mm_cpumask(mm));
	mm->mm_rb = RB_ROOT;
	rb_link = &mm->mm_rb.rb_node;
	rb_parent = NULL;
	pprev = &mm->mmap;
	retval = ksm_fork(mm, oldmm);
	if (retval)
		goto out;
	retval = khugepaged_fork(mm, oldmm);
	if (retval)
		goto out;

	prev = NULL;
	for (mpnt = oldmm->mmap; mpnt; mpnt = mpnt->vm_next) {
		struct file *file;

		if (mpnt->vm_flags & VM_DONTCOPY) {
			long pages = vma_pages(mpnt);
			mm->total_vm -= pages;
			vm_stat_account(mm, mpnt->vm_flags, mpnt->vm_file,
								-pages);
			continue;
		}
		charge = 0;
		if (mpnt->vm_flags & VM_ACCOUNT) {
			unsigned int len = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;
			if (security_vm_enough_memory_mm(oldmm, len)) 
				goto fail_nomem;
			charge = len;
		}
		tmp = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
		if (!tmp)
			goto fail_nomem;
		*tmp = *mpnt;
		INIT_LIST_HEAD(&tmp->anon_vma_chain);
		pol = mpol_dup(vma_policy(mpnt));
		retval = PTR_ERR(pol);
		if (IS_ERR(pol))
			goto fail_nomem_policy;
		vma_set_policy(tmp, pol);
		tmp->vm_mm = mm;
		if (anon_vma_fork(tmp, mpnt))
			goto fail_nomem_anon_vma_fork;
		tmp->vm_flags &= ~VM_LOCKED;
		tmp->vm_next = tmp->vm_prev = NULL;
		file = tmp->vm_file;
		if (file) {
			struct inode *inode = file->f_path.dentry->d_inode;
			struct address_space *mapping = file->f_mapping;

			get_file(file);
			if (tmp->vm_flags & VM_DENYWRITE)
				atomic_dec(&inode->i_writecount);
			mutex_lock(&mapping->i_mmap_mutex);
			if (tmp->vm_flags & VM_SHARED)
				mapping->i_mmap_writable++;
			flush_dcache_mmap_lock(mapping);
			
			vma_prio_tree_add(tmp, mpnt);
			flush_dcache_mmap_unlock(mapping);
			mutex_unlock(&mapping->i_mmap_mutex);
		}

		if (is_vm_hugetlb_page(tmp))
			reset_vma_resv_huge_pages(tmp);

		*pprev = tmp;
		pprev = &tmp->vm_next;
		tmp->vm_prev = prev;
		prev = tmp;

		__vma_link_rb(mm, tmp, rb_link, rb_parent);
		rb_link = &tmp->vm_rb.rb_right;
		rb_parent = &tmp->vm_rb;

		mm->map_count++;
		retval = copy_page_range(mm, oldmm, mpnt);

		if (tmp->vm_ops && tmp->vm_ops->open)
			tmp->vm_ops->open(tmp);

		if (retval)
//.........这里部分代码省略.........

开发者ID:MiniBlu，项目名称:cm11_kernel_htc_msm8974a3ul，代码行数:101，代码来源:fork.c

注：本文中的down_write_nested函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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C++ down_write_nested函数代码示例

示例1: omapfb_setup_mem

示例2: osd_object_write_lock

示例3: osp_md_object_write_lock

示例4: dup_mmap

示例5: dup_mmap

示例6: dup_mmap

示例7: store_size

示例8: dup_mmap

示例9: allocate_mm

示例10: dup_mmap

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