1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (C) 1994-2006  Linus Torvalds
30 	unsigned char *vec = walk->private;  in mincore_hugetlb()
34 	 * swapped out, but theoretically it needs to be checked.  in mincore_hugetlb()
36 	present = pte && !huge_pte_none_mostly(huge_ptep_get(walk->mm, addr, pte));  in mincore_hugetlb()
39 	walk->private = vec;  in mincore_hugetlb()
49  * and is up to date; i.e. that no page-in operation would be required
59 	 * file will not get a swp_entry_t in its pte, but rather it is like  in mincore_page()
61 	 * tmpfs's .fault). So swapped out tmpfs mappings are tested here.  in mincore_page()
75 	unsigned long nr = (end - addr) >> PAGE_SHIFT;  in __mincore_unmapped_range()
78 	if (vma->vm_file) {  in __mincore_unmapped_range()
83 			vec[i] = mincore_page(vma->vm_file->f_mapping, pgoff);  in __mincore_unmapped_range()
95 	walk->private += __mincore_unmapped_range(addr, end,  in mincore_unmapped_range()
96 						  walk->vma, walk->private);  in mincore_unmapped_range()
104 	struct vm_area_struct *vma = walk->vma;  in mincore_pte_range()
106 	unsigned char *vec = walk->private;  in mincore_pte_range()
107 	int nr = (end - addr) >> PAGE_SHIFT;  in mincore_pte_range()
116 	ptep = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);  in mincore_pte_range()
118 		walk->action = ACTION_AGAIN;  in mincore_pte_range()
151 	pte_unmap_unlock(ptep - 1, ptl);  in mincore_pte_range()
153 	walk->private += nr;  in mincore_pte_range()
162 	if (!vma->vm_file)  in can_do_mincore()
165 	 * Reveal pagecache information only for non-anonymous mappings that  in can_do_mincore()
167 	 * for writing; otherwise we'd be including shared non-exclusive  in can_do_mincore()
171 				      file_inode(vma->vm_file)) ||  in can_do_mincore()
172 	       file_permission(vma->vm_file, MAY_WRITE) == 0;  in can_do_mincore()
193 	vma = vma_lookup(current->mm, addr);  in do_mincore()
195 		return -ENOMEM;  in do_mincore()
196 	end = min(vma->vm_end, addr + (pages << PAGE_SHIFT));  in do_mincore()
198 		unsigned long pages = DIV_ROUND_UP(end - addr, PAGE_SIZE);  in do_mincore()
202 	err = walk_page_range(vma->vm_mm, addr, end, &mincore_walk_ops, vec);  in do_mincore()
205 	return (end - addr) >> PAGE_SHIFT;  in do_mincore()
223  *  zero    - success
224  *  -EFAULT - vec points to an illegal address
225  *  -EINVAL - addr is not a multiple of PAGE_SIZE
226  *  -ENOMEM - Addresses in the range [addr, addr + len] are
228  *		specify one or more pages which are not currently
230  *  -EAGAIN - A kernel resource was temporarily unavailable.
241 	/* Check the start address: needs to be page-aligned.. */  in SYSCALL_DEFINE3()
243 		return -EINVAL;  in SYSCALL_DEFINE3()
245 	/* ..and we need to be passed a valid user-space range */  in SYSCALL_DEFINE3()
247 		return -ENOMEM;  in SYSCALL_DEFINE3()
254 		return -EFAULT;  in SYSCALL_DEFINE3()
258 		return -EAGAIN;  in SYSCALL_DEFINE3()
266 		mmap_read_lock(current->mm);  in SYSCALL_DEFINE3()
268 		mmap_read_unlock(current->mm);  in SYSCALL_DEFINE3()
273 			retval = -EFAULT;  in SYSCALL_DEFINE3()
276 		pages -= retval;  in SYSCALL_DEFINE3()