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mm/nommu.c
48.4 KB
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/* * linux/mm/nommu.c * * Replacement code for mm functions to support CPU's that don't * have any form of memory management unit (thus no virtual memory). * * See Documentation/nommu-mmap.txt * |
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* Copyright (c) 2004-2008 David Howells <dhowells@redhat.com> |
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* Copyright (c) 2000-2003 David McCullough <davidm@snapgear.com> * Copyright (c) 2000-2001 D Jeff Dionne <jeff@uClinux.org> * Copyright (c) 2002 Greg Ungerer <gerg@snapgear.com> |
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* Copyright (c) 2007-2010 Paul Mundt <lethal@linux-sh.org> |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/export.h> |
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#include <linux/mm.h> |
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#include <linux/vmacache.h> |
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#include <linux/mman.h> #include <linux/swap.h> #include <linux/file.h> #include <linux/highmem.h> #include <linux/pagemap.h> #include <linux/slab.h> #include <linux/vmalloc.h> |
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#include <linux/blkdev.h> #include <linux/backing-dev.h> |
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#include <linux/compiler.h> |
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#include <linux/mount.h> #include <linux/personality.h> #include <linux/security.h> #include <linux/syscalls.h> |
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#include <linux/audit.h> |
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#include <linux/printk.h> |
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#include <asm/uaccess.h> #include <asm/tlb.h> #include <asm/tlbflush.h> |
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#include <asm/mmu_context.h> |
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#include "internal.h" |
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void *high_memory; |
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EXPORT_SYMBOL(high_memory); |
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struct page *mem_map; unsigned long max_mapnr; |
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EXPORT_SYMBOL(max_mapnr); |
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unsigned long highest_memmap_pfn; |
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int sysctl_nr_trim_pages = CONFIG_NOMMU_INITIAL_TRIM_EXCESS; |
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int heap_stack_gap = 0; |
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atomic_long_t mmap_pages_allocated; |
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|
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EXPORT_SYMBOL(mem_map); |
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|
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/* list of mapped, potentially shareable regions */ static struct kmem_cache *vm_region_jar; struct rb_root nommu_region_tree = RB_ROOT; DECLARE_RWSEM(nommu_region_sem); |
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|
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const struct vm_operations_struct generic_file_vm_ops = { |
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}; /* |
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* Return the total memory allocated for this pointer, not * just what the caller asked for. * * Doesn't have to be accurate, i.e. may have races. */ unsigned int kobjsize(const void *objp) { struct page *page; |
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/* * If the object we have should not have ksize performed on it, * return size of 0 */ |
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if (!objp || !virt_addr_valid(objp)) |
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return 0; page = virt_to_head_page(objp); |
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/* * If the allocator sets PageSlab, we know the pointer came from * kmalloc(). */ |
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if (PageSlab(page)) return ksize(objp); |
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/* |
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* If it's not a compound page, see if we have a matching VMA * region. This test is intentionally done in reverse order, * so if there's no VMA, we still fall through and hand back * PAGE_SIZE for 0-order pages. */ if (!PageCompound(page)) { struct vm_area_struct *vma; vma = find_vma(current->mm, (unsigned long)objp); if (vma) return vma->vm_end - vma->vm_start; } /* |
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* The ksize() function is only guaranteed to work for pointers |
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* returned by kmalloc(). So handle arbitrary pointers here. |
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*/ |
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return PAGE_SIZE << compound_order(page); |
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} |
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static long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, |
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unsigned long start, unsigned long nr_pages, unsigned int foll_flags, struct page **pages, struct vm_area_struct **vmas, int *nonblocking) |
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{ |
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struct vm_area_struct *vma; |
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unsigned long vm_flags; int i; /* calculate required read or write permissions. |
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* If FOLL_FORCE is set, we only require the "MAY" flags. |
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*/ |
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vm_flags = (foll_flags & FOLL_WRITE) ? (VM_WRITE | VM_MAYWRITE) : (VM_READ | VM_MAYREAD); vm_flags &= (foll_flags & FOLL_FORCE) ? (VM_MAYREAD | VM_MAYWRITE) : (VM_READ | VM_WRITE); |
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|
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for (i = 0; i < nr_pages; i++) { |
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vma = find_vma(mm, start); |
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if (!vma) goto finish_or_fault; /* protect what we can, including chardevs */ |
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if ((vma->vm_flags & (VM_IO | VM_PFNMAP)) || !(vm_flags & vma->vm_flags)) |
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goto finish_or_fault; |
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|
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if (pages) { pages[i] = virt_to_page(start); if (pages[i]) |
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get_page(pages[i]); |
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} if (vmas) |
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vmas[i] = vma; |
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start = (start + PAGE_SIZE) & PAGE_MASK; |
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} |
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return i; finish_or_fault: return i ? : -EFAULT; |
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} |
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|
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/* * get a list of pages in an address range belonging to the specified process * and indicate the VMA that covers each page * - this is potentially dodgy as we may end incrementing the page count of a * slab page or a secondary page from a compound page * - don't permit access to VMAs that don't support it, such as I/O mappings */ |
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long get_user_pages(unsigned long start, unsigned long nr_pages, |
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unsigned int gup_flags, struct page **pages, |
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struct vm_area_struct **vmas) |
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{ |
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return __get_user_pages(current, current->mm, start, nr_pages, gup_flags, pages, vmas, NULL); |
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} |
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EXPORT_SYMBOL(get_user_pages); |
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|
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long get_user_pages_locked(unsigned long start, unsigned long nr_pages, |
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unsigned int gup_flags, struct page **pages, |
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int *locked) |
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{ |
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return get_user_pages(start, nr_pages, gup_flags, pages, NULL); |
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} |
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EXPORT_SYMBOL(get_user_pages_locked); |
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|
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long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, unsigned long nr_pages, |
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struct page **pages, unsigned int gup_flags) |
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{ long ret; down_read(&mm->mmap_sem); |
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ret = __get_user_pages(tsk, mm, start, nr_pages, gup_flags, pages, NULL, NULL); |
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up_read(&mm->mmap_sem); return ret; } |
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EXPORT_SYMBOL(__get_user_pages_unlocked); |
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long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages, |
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struct page **pages, unsigned int gup_flags) |
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{ |
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return __get_user_pages_unlocked(current, current->mm, start, nr_pages, |
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pages, gup_flags); |
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} |
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EXPORT_SYMBOL(get_user_pages_unlocked); |
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|
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/** * follow_pfn - look up PFN at a user virtual address * @vma: memory mapping * @address: user virtual address * @pfn: location to store found PFN * * Only IO mappings and raw PFN mappings are allowed. * * Returns zero and the pfn at @pfn on success, -ve otherwise. */ int follow_pfn(struct vm_area_struct *vma, unsigned long address, unsigned long *pfn) { if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) return -EINVAL; *pfn = address >> PAGE_SHIFT; return 0; } EXPORT_SYMBOL(follow_pfn); |
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LIST_HEAD(vmap_area_list); |
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|
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void vfree(const void *addr) |
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{ kfree(addr); } |
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EXPORT_SYMBOL(vfree); |
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|
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void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot) |
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{ /* |
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* You can't specify __GFP_HIGHMEM with kmalloc() since kmalloc() * returns only a logical address. |
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*/ |
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return kmalloc(size, (gfp_mask | __GFP_COMP) & ~__GFP_HIGHMEM); |
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} |
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EXPORT_SYMBOL(__vmalloc); |
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|
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void *vmalloc_user(unsigned long size) { void *ret; ret = __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL); if (ret) { struct vm_area_struct *vma; down_write(¤t->mm->mmap_sem); vma = find_vma(current->mm, (unsigned long)ret); if (vma) vma->vm_flags |= VM_USERMAP; up_write(¤t->mm->mmap_sem); } return ret; } EXPORT_SYMBOL(vmalloc_user); |
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struct page *vmalloc_to_page(const void *addr) |
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{ return virt_to_page(addr); } |
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EXPORT_SYMBOL(vmalloc_to_page); |
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|
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unsigned long vmalloc_to_pfn(const void *addr) |
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{ return page_to_pfn(virt_to_page(addr)); } |
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EXPORT_SYMBOL(vmalloc_to_pfn); |
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long vread(char *buf, char *addr, unsigned long count) { |
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/* Don't allow overflow */ if ((unsigned long) buf + count < count) count = -(unsigned long) buf; |
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memcpy(buf, addr, count); return count; } long vwrite(char *buf, char *addr, unsigned long count) { /* Don't allow overflow */ if ((unsigned long) addr + count < count) count = -(unsigned long) addr; memcpy(addr, buf, count); |
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return count; |
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} /* |
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* vmalloc - allocate virtually contiguous memory |
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* * @size: allocation size * * Allocate enough pages to cover @size from the page level |
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* allocator and map them into contiguous kernel virtual space. |
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* |
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* For tight control over page level allocator and protection flags |
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* use __vmalloc() instead. */ void *vmalloc(unsigned long size) { return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL); } |
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EXPORT_SYMBOL(vmalloc); |
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/* |
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* vzalloc - allocate virtually contiguous memory with zero fill |
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* * @size: allocation size * * Allocate enough pages to cover @size from the page level |
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* allocator and map them into contiguous kernel virtual space. |
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* The memory allocated is set to zero. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ void *vzalloc(unsigned long size) { return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL); } EXPORT_SYMBOL(vzalloc); /** * vmalloc_node - allocate memory on a specific node * @size: allocation size * @node: numa node * * Allocate enough pages to cover @size from the page level * allocator and map them into contiguous kernel virtual space. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ |
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void *vmalloc_node(unsigned long size, int node) { return vmalloc(size); } |
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EXPORT_SYMBOL(vmalloc_node); |
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/** * vzalloc_node - allocate memory on a specific node with zero fill * @size: allocation size * @node: numa node * * Allocate enough pages to cover @size from the page level * allocator and map them into contiguous kernel virtual space. * The memory allocated is set to zero. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ void *vzalloc_node(unsigned long size, int node) { return vzalloc(size); } EXPORT_SYMBOL(vzalloc_node); |
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|
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#ifndef PAGE_KERNEL_EXEC # define PAGE_KERNEL_EXEC PAGE_KERNEL #endif /** * vmalloc_exec - allocate virtually contiguous, executable memory * @size: allocation size * * Kernel-internal function to allocate enough pages to cover @size * the page level allocator and map them into contiguous and * executable kernel virtual space. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ void *vmalloc_exec(unsigned long size) { return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC); } |
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/** * vmalloc_32 - allocate virtually contiguous memory (32bit addressable) |
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* @size: allocation size * * Allocate enough 32bit PA addressable pages to cover @size from the |
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* page level allocator and map them into contiguous kernel virtual space. |
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*/ void *vmalloc_32(unsigned long size) { return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL); } |
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EXPORT_SYMBOL(vmalloc_32); /** * vmalloc_32_user - allocate zeroed virtually contiguous 32bit memory * @size: allocation size * * The resulting memory area is 32bit addressable and zeroed so it can be * mapped to userspace without leaking data. |
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* * VM_USERMAP is set on the corresponding VMA so that subsequent calls to * remap_vmalloc_range() are permissible. |
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*/ void *vmalloc_32_user(unsigned long size) { |
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/* * We'll have to sort out the ZONE_DMA bits for 64-bit, * but for now this can simply use vmalloc_user() directly. */ return vmalloc_user(size); |
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} EXPORT_SYMBOL(vmalloc_32_user); |
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void *vmap(struct page **pages, unsigned int count, unsigned long flags, pgprot_t prot) { BUG(); return NULL; } |
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EXPORT_SYMBOL(vmap); |
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|
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void vunmap(const void *addr) |
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{ BUG(); } |
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EXPORT_SYMBOL(vunmap); |
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|
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void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t prot) { BUG(); return NULL; } EXPORT_SYMBOL(vm_map_ram); void vm_unmap_ram(const void *mem, unsigned int count) { BUG(); } EXPORT_SYMBOL(vm_unmap_ram); void vm_unmap_aliases(void) { } EXPORT_SYMBOL_GPL(vm_unmap_aliases); |
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/* |
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* Implement a stub for vmalloc_sync_all() if the architecture chose not to * have one. */ |
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void __weak vmalloc_sync_all(void) |
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{ } |
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/** * alloc_vm_area - allocate a range of kernel address space * @size: size of the area * * Returns: NULL on failure, vm_struct on success * * This function reserves a range of kernel address space, and * allocates pagetables to map that range. No actual mappings * are created. If the kernel address space is not shared * between processes, it syncs the pagetable across all * processes. */ |
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struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes) |
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{ BUG(); return NULL; } EXPORT_SYMBOL_GPL(alloc_vm_area); void free_vm_area(struct vm_struct *area) { BUG(); } EXPORT_SYMBOL_GPL(free_vm_area); |
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int vm_insert_page(struct vm_area_struct *vma, unsigned long addr, struct page *page) { return -EINVAL; } EXPORT_SYMBOL(vm_insert_page); |
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/* |
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* sys_brk() for the most part doesn't need the global kernel * lock, except when an application is doing something nasty * like trying to un-brk an area that has already been mapped * to a regular file. in this case, the unmapping will need * to invoke file system routines that need the global lock. */ |
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SYSCALL_DEFINE1(brk, unsigned long, brk) |
1da177e4c Linux-2.6.12-rc2 |
478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 |
{ struct mm_struct *mm = current->mm; if (brk < mm->start_brk || brk > mm->context.end_brk) return mm->brk; if (mm->brk == brk) return mm->brk; /* * Always allow shrinking brk */ if (brk <= mm->brk) { mm->brk = brk; return brk; } /* * Ok, looks good - let it rip. */ |
cfe79c00a NOMMU: Avoiding d... |
498 |
flush_icache_range(mm->brk, brk); |
1da177e4c Linux-2.6.12-rc2 |
499 500 |
return mm->brk = brk; } |
8feae1311 NOMMU: Make VMAs ... |
501 502 503 504 |
/* * initialise the VMA and region record slabs */ void __init mmap_init(void) |
1da177e4c Linux-2.6.12-rc2 |
505 |
{ |
00a62ce91 mm: fix Committed... |
506 |
int ret; |
908c7f194 percpu_counter: a... |
507 |
ret = percpu_counter_init(&vm_committed_as, 0, GFP_KERNEL); |
00a62ce91 mm: fix Committed... |
508 |
VM_BUG_ON(ret); |
5d097056c kmemcg: account c... |
509 |
vm_region_jar = KMEM_CACHE(vm_region, SLAB_PANIC|SLAB_ACCOUNT); |
1da177e4c Linux-2.6.12-rc2 |
510 |
} |
1da177e4c Linux-2.6.12-rc2 |
511 |
|
3034097a5 [PATCH] NOMMU: Or... |
512 |
/* |
8feae1311 NOMMU: Make VMAs ... |
513 514 |
* validate the region tree * - the caller must hold the region lock |
3034097a5 [PATCH] NOMMU: Or... |
515 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
516 517 |
#ifdef CONFIG_DEBUG_NOMMU_REGIONS static noinline void validate_nommu_regions(void) |
3034097a5 [PATCH] NOMMU: Or... |
518 |
{ |
8feae1311 NOMMU: Make VMAs ... |
519 520 |
struct vm_region *region, *last; struct rb_node *p, *lastp; |
3034097a5 [PATCH] NOMMU: Or... |
521 |
|
8feae1311 NOMMU: Make VMAs ... |
522 523 524 525 526 |
lastp = rb_first(&nommu_region_tree); if (!lastp) return; last = rb_entry(lastp, struct vm_region, vm_rb); |
c9427bc04 mm/nommu.c: drop ... |
527 528 |
BUG_ON(last->vm_end <= last->vm_start); BUG_ON(last->vm_top < last->vm_end); |
8feae1311 NOMMU: Make VMAs ... |
529 530 531 532 |
while ((p = rb_next(lastp))) { region = rb_entry(p, struct vm_region, vm_rb); last = rb_entry(lastp, struct vm_region, vm_rb); |
c9427bc04 mm/nommu.c: drop ... |
533 534 535 |
BUG_ON(region->vm_end <= region->vm_start); BUG_ON(region->vm_top < region->vm_end); BUG_ON(region->vm_start < last->vm_top); |
3034097a5 [PATCH] NOMMU: Or... |
536 |
|
8feae1311 NOMMU: Make VMAs ... |
537 538 |
lastp = p; } |
3034097a5 [PATCH] NOMMU: Or... |
539 |
} |
8feae1311 NOMMU: Make VMAs ... |
540 |
#else |
33e5d7697 nommu: fix a numb... |
541 542 543 |
static void validate_nommu_regions(void) { } |
8feae1311 NOMMU: Make VMAs ... |
544 |
#endif |
3034097a5 [PATCH] NOMMU: Or... |
545 546 |
/* |
8feae1311 NOMMU: Make VMAs ... |
547 |
* add a region into the global tree |
3034097a5 [PATCH] NOMMU: Or... |
548 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
549 |
static void add_nommu_region(struct vm_region *region) |
3034097a5 [PATCH] NOMMU: Or... |
550 |
{ |
8feae1311 NOMMU: Make VMAs ... |
551 552 |
struct vm_region *pregion; struct rb_node **p, *parent; |
3034097a5 [PATCH] NOMMU: Or... |
553 |
|
8feae1311 NOMMU: Make VMAs ... |
554 |
validate_nommu_regions(); |
8feae1311 NOMMU: Make VMAs ... |
555 556 557 558 559 560 561 562 563 564 565 566 567 |
parent = NULL; p = &nommu_region_tree.rb_node; while (*p) { parent = *p; pregion = rb_entry(parent, struct vm_region, vm_rb); if (region->vm_start < pregion->vm_start) p = &(*p)->rb_left; else if (region->vm_start > pregion->vm_start) p = &(*p)->rb_right; else if (pregion == region) return; else BUG(); |
3034097a5 [PATCH] NOMMU: Or... |
568 |
} |
8feae1311 NOMMU: Make VMAs ... |
569 570 |
rb_link_node(®ion->vm_rb, parent, p); rb_insert_color(®ion->vm_rb, &nommu_region_tree); |
3034097a5 [PATCH] NOMMU: Or... |
571 |
|
8feae1311 NOMMU: Make VMAs ... |
572 |
validate_nommu_regions(); |
3034097a5 [PATCH] NOMMU: Or... |
573 |
} |
3034097a5 [PATCH] NOMMU: Or... |
574 575 |
/* |
8feae1311 NOMMU: Make VMAs ... |
576 |
* delete a region from the global tree |
930e652a2 [PATCH] NOMMU: Ma... |
577 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
578 |
static void delete_nommu_region(struct vm_region *region) |
930e652a2 [PATCH] NOMMU: Ma... |
579 |
{ |
8feae1311 NOMMU: Make VMAs ... |
580 |
BUG_ON(!nommu_region_tree.rb_node); |
930e652a2 [PATCH] NOMMU: Ma... |
581 |
|
8feae1311 NOMMU: Make VMAs ... |
582 583 584 |
validate_nommu_regions(); rb_erase(®ion->vm_rb, &nommu_region_tree); validate_nommu_regions(); |
57c8f63e8 nommu: stub expan... |
585 |
} |
930e652a2 [PATCH] NOMMU: Ma... |
586 |
/* |
8feae1311 NOMMU: Make VMAs ... |
587 |
* free a contiguous series of pages |
6fa5f80bc [PATCH] NOMMU: Ma... |
588 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
589 |
static void free_page_series(unsigned long from, unsigned long to) |
6fa5f80bc [PATCH] NOMMU: Ma... |
590 |
{ |
8feae1311 NOMMU: Make VMAs ... |
591 592 |
for (; from < to; from += PAGE_SIZE) { struct page *page = virt_to_page(from); |
33e5d7697 nommu: fix a numb... |
593 |
atomic_long_dec(&mmap_pages_allocated); |
8feae1311 NOMMU: Make VMAs ... |
594 |
put_page(page); |
6fa5f80bc [PATCH] NOMMU: Ma... |
595 |
} |
6fa5f80bc [PATCH] NOMMU: Ma... |
596 597 598 |
} /* |
8feae1311 NOMMU: Make VMAs ... |
599 |
* release a reference to a region |
33e5d7697 nommu: fix a numb... |
600 |
* - the caller must hold the region semaphore for writing, which this releases |
dd8632a12 NOMMU: Make mmap ... |
601 |
* - the region may not have been added to the tree yet, in which case vm_top |
8feae1311 NOMMU: Make VMAs ... |
602 |
* will equal vm_start |
3034097a5 [PATCH] NOMMU: Or... |
603 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
604 605 |
static void __put_nommu_region(struct vm_region *region) __releases(nommu_region_sem) |
1da177e4c Linux-2.6.12-rc2 |
606 |
{ |
8feae1311 NOMMU: Make VMAs ... |
607 |
BUG_ON(!nommu_region_tree.rb_node); |
1da177e4c Linux-2.6.12-rc2 |
608 |
|
1e2ae599d nommu: struct vm_... |
609 |
if (--region->vm_usage == 0) { |
dd8632a12 NOMMU: Make mmap ... |
610 |
if (region->vm_top > region->vm_start) |
8feae1311 NOMMU: Make VMAs ... |
611 612 613 614 615 616 617 618 |
delete_nommu_region(region); up_write(&nommu_region_sem); if (region->vm_file) fput(region->vm_file); /* IO memory and memory shared directly out of the pagecache * from ramfs/tmpfs mustn't be released here */ |
22cc877b3 mm: nommu: refact... |
619 |
if (region->vm_flags & VM_MAPPED_COPY) |
dd8632a12 NOMMU: Make mmap ... |
620 |
free_page_series(region->vm_start, region->vm_top); |
8feae1311 NOMMU: Make VMAs ... |
621 622 623 |
kmem_cache_free(vm_region_jar, region); } else { up_write(&nommu_region_sem); |
1da177e4c Linux-2.6.12-rc2 |
624 |
} |
8feae1311 NOMMU: Make VMAs ... |
625 |
} |
1da177e4c Linux-2.6.12-rc2 |
626 |
|
8feae1311 NOMMU: Make VMAs ... |
627 628 629 630 631 632 633 |
/* * release a reference to a region */ static void put_nommu_region(struct vm_region *region) { down_write(&nommu_region_sem); __put_nommu_region(region); |
1da177e4c Linux-2.6.12-rc2 |
634 |
} |
3034097a5 [PATCH] NOMMU: Or... |
635 |
/* |
eb8cdec4a nommu: add suppor... |
636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 |
* update protection on a vma */ static void protect_vma(struct vm_area_struct *vma, unsigned long flags) { #ifdef CONFIG_MPU struct mm_struct *mm = vma->vm_mm; long start = vma->vm_start & PAGE_MASK; while (start < vma->vm_end) { protect_page(mm, start, flags); start += PAGE_SIZE; } update_protections(mm); #endif } /* |
8feae1311 NOMMU: Make VMAs ... |
652 653 654 655 |
* add a VMA into a process's mm_struct in the appropriate place in the list * and tree and add to the address space's page tree also if not an anonymous * page * - should be called with mm->mmap_sem held writelocked |
3034097a5 [PATCH] NOMMU: Or... |
656 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
657 |
static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
658 |
{ |
6038def0d mm: nommu: sort m... |
659 |
struct vm_area_struct *pvma, *prev; |
1da177e4c Linux-2.6.12-rc2 |
660 |
struct address_space *mapping; |
6038def0d mm: nommu: sort m... |
661 |
struct rb_node **p, *parent, *rb_prev; |
8feae1311 NOMMU: Make VMAs ... |
662 |
|
8feae1311 NOMMU: Make VMAs ... |
663 664 665 666 |
BUG_ON(!vma->vm_region); mm->map_count++; vma->vm_mm = mm; |
1da177e4c Linux-2.6.12-rc2 |
667 |
|
eb8cdec4a nommu: add suppor... |
668 |
protect_vma(vma, vma->vm_flags); |
1da177e4c Linux-2.6.12-rc2 |
669 670 671 |
/* add the VMA to the mapping */ if (vma->vm_file) { mapping = vma->vm_file->f_mapping; |
83cde9e8b mm: use new helpe... |
672 |
i_mmap_lock_write(mapping); |
1da177e4c Linux-2.6.12-rc2 |
673 |
flush_dcache_mmap_lock(mapping); |
6b2dbba8b mm: replace vma p... |
674 |
vma_interval_tree_insert(vma, &mapping->i_mmap); |
1da177e4c Linux-2.6.12-rc2 |
675 |
flush_dcache_mmap_unlock(mapping); |
83cde9e8b mm: use new helpe... |
676 |
i_mmap_unlock_write(mapping); |
1da177e4c Linux-2.6.12-rc2 |
677 |
} |
8feae1311 NOMMU: Make VMAs ... |
678 |
/* add the VMA to the tree */ |
6038def0d mm: nommu: sort m... |
679 |
parent = rb_prev = NULL; |
8feae1311 NOMMU: Make VMAs ... |
680 |
p = &mm->mm_rb.rb_node; |
1da177e4c Linux-2.6.12-rc2 |
681 682 683 |
while (*p) { parent = *p; pvma = rb_entry(parent, struct vm_area_struct, vm_rb); |
8feae1311 NOMMU: Make VMAs ... |
684 685 686 |
/* sort by: start addr, end addr, VMA struct addr in that order * (the latter is necessary as we may get identical VMAs) */ if (vma->vm_start < pvma->vm_start) |
1da177e4c Linux-2.6.12-rc2 |
687 |
p = &(*p)->rb_left; |
6038def0d mm: nommu: sort m... |
688 689 |
else if (vma->vm_start > pvma->vm_start) { rb_prev = parent; |
1da177e4c Linux-2.6.12-rc2 |
690 |
p = &(*p)->rb_right; |
6038def0d mm: nommu: sort m... |
691 |
} else if (vma->vm_end < pvma->vm_end) |
8feae1311 NOMMU: Make VMAs ... |
692 |
p = &(*p)->rb_left; |
6038def0d mm: nommu: sort m... |
693 694 |
else if (vma->vm_end > pvma->vm_end) { rb_prev = parent; |
8feae1311 NOMMU: Make VMAs ... |
695 |
p = &(*p)->rb_right; |
6038def0d mm: nommu: sort m... |
696 |
} else if (vma < pvma) |
8feae1311 NOMMU: Make VMAs ... |
697 |
p = &(*p)->rb_left; |
6038def0d mm: nommu: sort m... |
698 699 |
else if (vma > pvma) { rb_prev = parent; |
8feae1311 NOMMU: Make VMAs ... |
700 |
p = &(*p)->rb_right; |
6038def0d mm: nommu: sort m... |
701 |
} else |
8feae1311 NOMMU: Make VMAs ... |
702 |
BUG(); |
1da177e4c Linux-2.6.12-rc2 |
703 704 705 |
} rb_link_node(&vma->vm_rb, parent, p); |
8feae1311 NOMMU: Make VMAs ... |
706 707 708 |
rb_insert_color(&vma->vm_rb, &mm->mm_rb); /* add VMA to the VMA list also */ |
6038def0d mm: nommu: sort m... |
709 710 711 |
prev = NULL; if (rb_prev) prev = rb_entry(rb_prev, struct vm_area_struct, vm_rb); |
8feae1311 NOMMU: Make VMAs ... |
712 |
|
6038def0d mm: nommu: sort m... |
713 |
__vma_link_list(mm, vma, prev, parent); |
1da177e4c Linux-2.6.12-rc2 |
714 |
} |
3034097a5 [PATCH] NOMMU: Or... |
715 |
/* |
8feae1311 NOMMU: Make VMAs ... |
716 |
* delete a VMA from its owning mm_struct and address space |
3034097a5 [PATCH] NOMMU: Or... |
717 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
718 |
static void delete_vma_from_mm(struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
719 |
{ |
615d6e875 mm: per-thread vm... |
720 |
int i; |
1da177e4c Linux-2.6.12-rc2 |
721 |
struct address_space *mapping; |
8feae1311 NOMMU: Make VMAs ... |
722 |
struct mm_struct *mm = vma->vm_mm; |
615d6e875 mm: per-thread vm... |
723 |
struct task_struct *curr = current; |
8feae1311 NOMMU: Make VMAs ... |
724 |
|
eb8cdec4a nommu: add suppor... |
725 |
protect_vma(vma, 0); |
8feae1311 NOMMU: Make VMAs ... |
726 |
mm->map_count--; |
615d6e875 mm: per-thread vm... |
727 728 729 |
for (i = 0; i < VMACACHE_SIZE; i++) { /* if the vma is cached, invalidate the entire cache */ if (curr->vmacache[i] == vma) { |
e020d5bd8 mm: nommu: per-th... |
730 |
vmacache_invalidate(mm); |
615d6e875 mm: per-thread vm... |
731 732 733 |
break; } } |
1da177e4c Linux-2.6.12-rc2 |
734 735 736 737 |
/* remove the VMA from the mapping */ if (vma->vm_file) { mapping = vma->vm_file->f_mapping; |
83cde9e8b mm: use new helpe... |
738 |
i_mmap_lock_write(mapping); |
1da177e4c Linux-2.6.12-rc2 |
739 |
flush_dcache_mmap_lock(mapping); |
6b2dbba8b mm: replace vma p... |
740 |
vma_interval_tree_remove(vma, &mapping->i_mmap); |
1da177e4c Linux-2.6.12-rc2 |
741 |
flush_dcache_mmap_unlock(mapping); |
83cde9e8b mm: use new helpe... |
742 |
i_mmap_unlock_write(mapping); |
1da177e4c Linux-2.6.12-rc2 |
743 |
} |
8feae1311 NOMMU: Make VMAs ... |
744 745 |
/* remove from the MM's tree and list */ rb_erase(&vma->vm_rb, &mm->mm_rb); |
b951bf2c4 mm: nommu: don't ... |
746 747 748 749 750 751 752 753 |
if (vma->vm_prev) vma->vm_prev->vm_next = vma->vm_next; else mm->mmap = vma->vm_next; if (vma->vm_next) vma->vm_next->vm_prev = vma->vm_prev; |
8feae1311 NOMMU: Make VMAs ... |
754 755 756 757 758 759 760 |
} /* * destroy a VMA record */ static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma) { |
8feae1311 NOMMU: Make VMAs ... |
761 762 |
if (vma->vm_ops && vma->vm_ops->close) vma->vm_ops->close(vma); |
e9714acf8 mm: kill vma flag... |
763 |
if (vma->vm_file) |
8feae1311 NOMMU: Make VMAs ... |
764 |
fput(vma->vm_file); |
8feae1311 NOMMU: Make VMAs ... |
765 766 767 768 769 770 771 772 773 774 775 |
put_nommu_region(vma->vm_region); kmem_cache_free(vm_area_cachep, vma); } /* * look up the first VMA in which addr resides, NULL if none * - should be called with mm->mmap_sem at least held readlocked */ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr) { struct vm_area_struct *vma; |
8feae1311 NOMMU: Make VMAs ... |
776 777 |
/* check the cache first */ |
615d6e875 mm: per-thread vm... |
778 779 |
vma = vmacache_find(mm, addr); if (likely(vma)) |
8feae1311 NOMMU: Make VMAs ... |
780 |
return vma; |
e922c4c53 mm: nommu: find v... |
781 |
/* trawl the list (there may be multiple mappings in which addr |
8feae1311 NOMMU: Make VMAs ... |
782 |
* resides) */ |
e922c4c53 mm: nommu: find v... |
783 |
for (vma = mm->mmap; vma; vma = vma->vm_next) { |
8feae1311 NOMMU: Make VMAs ... |
784 785 786 |
if (vma->vm_start > addr) return NULL; if (vma->vm_end > addr) { |
615d6e875 mm: per-thread vm... |
787 |
vmacache_update(addr, vma); |
8feae1311 NOMMU: Make VMAs ... |
788 789 790 791 792 793 794 795 796 797 798 799 800 801 |
return vma; } } return NULL; } EXPORT_SYMBOL(find_vma); /* * find a VMA * - we don't extend stack VMAs under NOMMU conditions */ struct vm_area_struct *find_extend_vma(struct mm_struct *mm, unsigned long addr) { |
7561e8ca0 NOMMU: Revert 'no... |
802 |
return find_vma(mm, addr); |
8feae1311 NOMMU: Make VMAs ... |
803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 |
} /* * expand a stack to a given address * - not supported under NOMMU conditions */ int expand_stack(struct vm_area_struct *vma, unsigned long address) { return -ENOMEM; } /* * look up the first VMA exactly that exactly matches addr * - should be called with mm->mmap_sem at least held readlocked */ static struct vm_area_struct *find_vma_exact(struct mm_struct *mm, unsigned long addr, unsigned long len) { struct vm_area_struct *vma; |
8feae1311 NOMMU: Make VMAs ... |
823 824 825 |
unsigned long end = addr + len; /* check the cache first */ |
615d6e875 mm: per-thread vm... |
826 827 |
vma = vmacache_find_exact(mm, addr, end); if (vma) |
8feae1311 NOMMU: Make VMAs ... |
828 |
return vma; |
e922c4c53 mm: nommu: find v... |
829 |
/* trawl the list (there may be multiple mappings in which addr |
8feae1311 NOMMU: Make VMAs ... |
830 |
* resides) */ |
e922c4c53 mm: nommu: find v... |
831 |
for (vma = mm->mmap; vma; vma = vma->vm_next) { |
8feae1311 NOMMU: Make VMAs ... |
832 833 834 835 836 |
if (vma->vm_start < addr) continue; if (vma->vm_start > addr) return NULL; if (vma->vm_end == end) { |
615d6e875 mm: per-thread vm... |
837 |
vmacache_update(addr, vma); |
8feae1311 NOMMU: Make VMAs ... |
838 839 840 841 842 |
return vma; } } return NULL; |
1da177e4c Linux-2.6.12-rc2 |
843 844 845 846 847 848 849 850 851 852 853 854 855 856 |
} /* * determine whether a mapping should be permitted and, if so, what sort of * mapping we're capable of supporting */ static int validate_mmap_request(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long pgoff, unsigned long *_capabilities) { |
8feae1311 NOMMU: Make VMAs ... |
857 |
unsigned long capabilities, rlen; |
1da177e4c Linux-2.6.12-rc2 |
858 859 860 |
int ret; /* do the simple checks first */ |
22cc877b3 mm: nommu: refact... |
861 |
if (flags & MAP_FIXED) |
1da177e4c Linux-2.6.12-rc2 |
862 |
return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
863 864 865 866 |
if ((flags & MAP_TYPE) != MAP_PRIVATE && (flags & MAP_TYPE) != MAP_SHARED) return -EINVAL; |
f81cff0d4 [PATCH] uclinux: ... |
867 |
if (!len) |
1da177e4c Linux-2.6.12-rc2 |
868 |
return -EINVAL; |
f81cff0d4 [PATCH] uclinux: ... |
869 |
/* Careful about overflows.. */ |
8feae1311 NOMMU: Make VMAs ... |
870 871 |
rlen = PAGE_ALIGN(len); if (!rlen || rlen > TASK_SIZE) |
f81cff0d4 [PATCH] uclinux: ... |
872 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
873 |
/* offset overflow? */ |
8feae1311 NOMMU: Make VMAs ... |
874 |
if ((pgoff + (rlen >> PAGE_SHIFT)) < pgoff) |
f81cff0d4 [PATCH] uclinux: ... |
875 |
return -EOVERFLOW; |
1da177e4c Linux-2.6.12-rc2 |
876 877 |
if (file) { |
1da177e4c Linux-2.6.12-rc2 |
878 |
/* files must support mmap */ |
72c2d5319 file->f_op is nev... |
879 |
if (!file->f_op->mmap) |
1da177e4c Linux-2.6.12-rc2 |
880 881 882 883 884 885 |
return -ENODEV; /* work out if what we've got could possibly be shared * - we support chardevs that provide their own "memory" * - we support files/blockdevs that are memory backed */ |
b4caecd48 fs: introduce f_o... |
886 887 888 |
if (file->f_op->mmap_capabilities) { capabilities = file->f_op->mmap_capabilities(file); } else { |
1da177e4c Linux-2.6.12-rc2 |
889 890 |
/* no explicit capabilities set, so assume some * defaults */ |
496ad9aa8 new helper: file_... |
891 |
switch (file_inode(file)->i_mode & S_IFMT) { |
1da177e4c Linux-2.6.12-rc2 |
892 893 |
case S_IFREG: case S_IFBLK: |
b4caecd48 fs: introduce f_o... |
894 |
capabilities = NOMMU_MAP_COPY; |
1da177e4c Linux-2.6.12-rc2 |
895 896 897 898 |
break; case S_IFCHR: capabilities = |
b4caecd48 fs: introduce f_o... |
899 900 901 |
NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; |
1da177e4c Linux-2.6.12-rc2 |
902 903 904 905 906 907 908 909 910 911 |
break; default: return -EINVAL; } } /* eliminate any capabilities that we can't support on this * device */ if (!file->f_op->get_unmapped_area) |
b4caecd48 fs: introduce f_o... |
912 |
capabilities &= ~NOMMU_MAP_DIRECT; |
6e242a1ce nommu: use __vfs_... |
913 |
if (!(file->f_mode & FMODE_CAN_READ)) |
b4caecd48 fs: introduce f_o... |
914 |
capabilities &= ~NOMMU_MAP_COPY; |
1da177e4c Linux-2.6.12-rc2 |
915 |
|
28d7a6ae9 nommu: check fd r... |
916 917 918 |
/* The file shall have been opened with read permission. */ if (!(file->f_mode & FMODE_READ)) return -EACCES; |
1da177e4c Linux-2.6.12-rc2 |
919 920 921 922 923 |
if (flags & MAP_SHARED) { /* do checks for writing, appending and locking */ if ((prot & PROT_WRITE) && !(file->f_mode & FMODE_WRITE)) return -EACCES; |
496ad9aa8 new helper: file_... |
924 |
if (IS_APPEND(file_inode(file)) && |
1da177e4c Linux-2.6.12-rc2 |
925 926 |
(file->f_mode & FMODE_WRITE)) return -EACCES; |
d7a06983a locks: fix locks_... |
927 |
if (locks_verify_locked(file)) |
1da177e4c Linux-2.6.12-rc2 |
928 |
return -EAGAIN; |
b4caecd48 fs: introduce f_o... |
929 |
if (!(capabilities & NOMMU_MAP_DIRECT)) |
1da177e4c Linux-2.6.12-rc2 |
930 |
return -ENODEV; |
1da177e4c Linux-2.6.12-rc2 |
931 |
/* we mustn't privatise shared mappings */ |
b4caecd48 fs: introduce f_o... |
932 |
capabilities &= ~NOMMU_MAP_COPY; |
ac7149045 mm: fix 'ERROR: d... |
933 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
934 935 |
/* we're going to read the file into private memory we * allocate */ |
b4caecd48 fs: introduce f_o... |
936 |
if (!(capabilities & NOMMU_MAP_COPY)) |
1da177e4c Linux-2.6.12-rc2 |
937 938 939 940 941 |
return -ENODEV; /* we don't permit a private writable mapping to be * shared with the backing device */ if (prot & PROT_WRITE) |
b4caecd48 fs: introduce f_o... |
942 |
capabilities &= ~NOMMU_MAP_DIRECT; |
1da177e4c Linux-2.6.12-rc2 |
943 |
} |
b4caecd48 fs: introduce f_o... |
944 945 946 947 |
if (capabilities & NOMMU_MAP_DIRECT) { if (((prot & PROT_READ) && !(capabilities & NOMMU_MAP_READ)) || ((prot & PROT_WRITE) && !(capabilities & NOMMU_MAP_WRITE)) || ((prot & PROT_EXEC) && !(capabilities & NOMMU_MAP_EXEC)) |
3c7b20454 nommu: allow priv... |
948 |
) { |
b4caecd48 fs: introduce f_o... |
949 |
capabilities &= ~NOMMU_MAP_DIRECT; |
3c7b20454 nommu: allow priv... |
950 |
if (flags & MAP_SHARED) { |
22cc877b3 mm: nommu: refact... |
951 952 |
pr_warn("MAP_SHARED not completely supported on !MMU "); |
3c7b20454 nommu: allow priv... |
953 954 955 956 |
return -EINVAL; } } } |
1da177e4c Linux-2.6.12-rc2 |
957 958 |
/* handle executable mappings and implied executable * mappings */ |
90f8572b0 vfs: Commit to ne... |
959 |
if (path_noexec(&file->f_path)) { |
1da177e4c Linux-2.6.12-rc2 |
960 961 |
if (prot & PROT_EXEC) return -EPERM; |
ac7149045 mm: fix 'ERROR: d... |
962 |
} else if ((prot & PROT_READ) && !(prot & PROT_EXEC)) { |
1da177e4c Linux-2.6.12-rc2 |
963 964 |
/* handle implication of PROT_EXEC by PROT_READ */ if (current->personality & READ_IMPLIES_EXEC) { |
b4caecd48 fs: introduce f_o... |
965 |
if (capabilities & NOMMU_MAP_EXEC) |
1da177e4c Linux-2.6.12-rc2 |
966 967 |
prot |= PROT_EXEC; } |
ac7149045 mm: fix 'ERROR: d... |
968 |
} else if ((prot & PROT_READ) && |
1da177e4c Linux-2.6.12-rc2 |
969 |
(prot & PROT_EXEC) && |
b4caecd48 fs: introduce f_o... |
970 |
!(capabilities & NOMMU_MAP_EXEC) |
1da177e4c Linux-2.6.12-rc2 |
971 972 |
) { /* backing file is not executable, try to copy */ |
b4caecd48 fs: introduce f_o... |
973 |
capabilities &= ~NOMMU_MAP_DIRECT; |
1da177e4c Linux-2.6.12-rc2 |
974 |
} |
ac7149045 mm: fix 'ERROR: d... |
975 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
976 977 978 |
/* anonymous mappings are always memory backed and can be * privately mapped */ |
b4caecd48 fs: introduce f_o... |
979 |
capabilities = NOMMU_MAP_COPY; |
1da177e4c Linux-2.6.12-rc2 |
980 981 982 983 984 985 986 987 |
/* handle PROT_EXEC implication by PROT_READ */ if ((prot & PROT_READ) && (current->personality & READ_IMPLIES_EXEC)) prot |= PROT_EXEC; } /* allow the security API to have its say */ |
e5467859f split ->file_mmap... |
988 989 990 |
ret = security_mmap_addr(addr); if (ret < 0) return ret; |
1da177e4c Linux-2.6.12-rc2 |
991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 |
/* looks okay */ *_capabilities = capabilities; return 0; } /* * we've determined that we can make the mapping, now translate what we * now know into VMA flags */ static unsigned long determine_vm_flags(struct file *file, unsigned long prot, unsigned long flags, unsigned long capabilities) { unsigned long vm_flags; |
e6bfb7095 mm/core, arch, po... |
1007 |
vm_flags = calc_vm_prot_bits(prot, 0) | calc_vm_flag_bits(flags); |
1da177e4c Linux-2.6.12-rc2 |
1008 |
/* vm_flags |= mm->def_flags; */ |
b4caecd48 fs: introduce f_o... |
1009 |
if (!(capabilities & NOMMU_MAP_DIRECT)) { |
1da177e4c Linux-2.6.12-rc2 |
1010 |
/* attempt to share read-only copies of mapped file chunks */ |
3c7b20454 nommu: allow priv... |
1011 |
vm_flags |= VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC; |
1da177e4c Linux-2.6.12-rc2 |
1012 1013 |
if (file && !(prot & PROT_WRITE)) vm_flags |= VM_MAYSHARE; |
3c7b20454 nommu: allow priv... |
1014 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
1015 1016 1017 |
/* overlay a shareable mapping on the backing device or inode * if possible - used for chardevs, ramfs/tmpfs/shmfs and * romfs/cramfs */ |
b4caecd48 fs: introduce f_o... |
1018 |
vm_flags |= VM_MAYSHARE | (capabilities & NOMMU_VMFLAGS); |
1da177e4c Linux-2.6.12-rc2 |
1019 |
if (flags & MAP_SHARED) |
3c7b20454 nommu: allow priv... |
1020 |
vm_flags |= VM_SHARED; |
1da177e4c Linux-2.6.12-rc2 |
1021 1022 1023 1024 1025 1026 |
} /* refuse to let anyone share private mappings with this process if * it's being traced - otherwise breakpoints set in it may interfere * with another untraced process */ |
a288eecce ptrace: kill triv... |
1027 |
if ((flags & MAP_PRIVATE) && current->ptrace) |
1da177e4c Linux-2.6.12-rc2 |
1028 1029 1030 1031 1032 1033 |
vm_flags &= ~VM_MAYSHARE; return vm_flags; } /* |
8feae1311 NOMMU: Make VMAs ... |
1034 1035 |
* set up a shared mapping on a file (the driver or filesystem provides and * pins the storage) |
1da177e4c Linux-2.6.12-rc2 |
1036 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
1037 |
static int do_mmap_shared_file(struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
1038 1039 1040 1041 |
{ int ret; ret = vma->vm_file->f_op->mmap(vma->vm_file, vma); |
dd8632a12 NOMMU: Make mmap ... |
1042 1043 |
if (ret == 0) { vma->vm_region->vm_top = vma->vm_region->vm_end; |
645d83c5d NOMMU: Fix MAP_PR... |
1044 |
return 0; |
dd8632a12 NOMMU: Make mmap ... |
1045 |
} |
1da177e4c Linux-2.6.12-rc2 |
1046 1047 |
if (ret != -ENOSYS) return ret; |
3fa30460e nommu: fix an inc... |
1048 1049 1050 |
/* getting -ENOSYS indicates that direct mmap isn't possible (as * opposed to tried but failed) so we can only give a suitable error as * it's not possible to make a private copy if MAP_SHARED was given */ |
1da177e4c Linux-2.6.12-rc2 |
1051 1052 1053 1054 1055 1056 |
return -ENODEV; } /* * set up a private mapping or an anonymous shared mapping */ |
8feae1311 NOMMU: Make VMAs ... |
1057 1058 |
static int do_mmap_private(struct vm_area_struct *vma, struct vm_region *region, |
645d83c5d NOMMU: Fix MAP_PR... |
1059 1060 |
unsigned long len, unsigned long capabilities) |
1da177e4c Linux-2.6.12-rc2 |
1061 |
{ |
dbc8358c7 mm/nommu: use all... |
1062 |
unsigned long total, point; |
1da177e4c Linux-2.6.12-rc2 |
1063 |
void *base; |
8feae1311 NOMMU: Make VMAs ... |
1064 |
int ret, order; |
1da177e4c Linux-2.6.12-rc2 |
1065 1066 1067 1068 1069 |
/* invoke the file's mapping function so that it can keep track of * shared mappings on devices or memory * - VM_MAYSHARE will be set if it may attempt to share */ |
b4caecd48 fs: introduce f_o... |
1070 |
if (capabilities & NOMMU_MAP_DIRECT) { |
1da177e4c Linux-2.6.12-rc2 |
1071 |
ret = vma->vm_file->f_op->mmap(vma->vm_file, vma); |
dd8632a12 NOMMU: Make mmap ... |
1072 |
if (ret == 0) { |
1da177e4c Linux-2.6.12-rc2 |
1073 |
/* shouldn't return success if we're not sharing */ |
dd8632a12 NOMMU: Make mmap ... |
1074 1075 |
BUG_ON(!(vma->vm_flags & VM_MAYSHARE)); vma->vm_region->vm_top = vma->vm_region->vm_end; |
645d83c5d NOMMU: Fix MAP_PR... |
1076 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1077 |
} |
dd8632a12 NOMMU: Make mmap ... |
1078 1079 |
if (ret != -ENOSYS) return ret; |
1da177e4c Linux-2.6.12-rc2 |
1080 1081 1082 1083 1084 |
/* getting an ENOSYS error indicates that direct mmap isn't * possible (as opposed to tried but failed) so we'll try to * make a private copy of the data and map that instead */ } |
8feae1311 NOMMU: Make VMAs ... |
1085 |
|
1da177e4c Linux-2.6.12-rc2 |
1086 1087 1088 1089 |
/* allocate some memory to hold the mapping * - note that this may not return a page-aligned address if the object * we're allocating is smaller than a page */ |
f67d9b157 nommu: add page a... |
1090 |
order = get_order(len); |
8feae1311 NOMMU: Make VMAs ... |
1091 |
total = 1 << order; |
f67d9b157 nommu: add page a... |
1092 |
point = len >> PAGE_SHIFT; |
dd8632a12 NOMMU: Make mmap ... |
1093 |
|
dbc8358c7 mm/nommu: use all... |
1094 |
/* we don't want to allocate a power-of-2 sized page set */ |
22cc877b3 mm: nommu: refact... |
1095 |
if (sysctl_nr_trim_pages && total - point >= sysctl_nr_trim_pages) |
dbc8358c7 mm/nommu: use all... |
1096 |
total = point; |
8feae1311 NOMMU: Make VMAs ... |
1097 |
|
da616534e mm/nommu: fix mem... |
1098 |
base = alloc_pages_exact(total << PAGE_SHIFT, GFP_KERNEL); |
dbc8358c7 mm/nommu: use all... |
1099 1100 1101 1102 |
if (!base) goto enomem; atomic_long_add(total, &mmap_pages_allocated); |
1da177e4c Linux-2.6.12-rc2 |
1103 |
|
8feae1311 NOMMU: Make VMAs ... |
1104 1105 |
region->vm_flags = vma->vm_flags |= VM_MAPPED_COPY; region->vm_start = (unsigned long) base; |
f67d9b157 nommu: add page a... |
1106 |
region->vm_end = region->vm_start + len; |
dd8632a12 NOMMU: Make mmap ... |
1107 |
region->vm_top = region->vm_start + (total << PAGE_SHIFT); |
8feae1311 NOMMU: Make VMAs ... |
1108 1109 1110 |
vma->vm_start = region->vm_start; vma->vm_end = region->vm_start + len; |
1da177e4c Linux-2.6.12-rc2 |
1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 |
if (vma->vm_file) { /* read the contents of a file into the copy */ mm_segment_t old_fs; loff_t fpos; fpos = vma->vm_pgoff; fpos <<= PAGE_SHIFT; old_fs = get_fs(); set_fs(KERNEL_DS); |
6e242a1ce nommu: use __vfs_... |
1122 |
ret = __vfs_read(vma->vm_file, base, len, &fpos); |
1da177e4c Linux-2.6.12-rc2 |
1123 1124 1125 1126 1127 1128 |
set_fs(old_fs); if (ret < 0) goto error_free; /* clear the last little bit */ |
f67d9b157 nommu: add page a... |
1129 1130 |
if (ret < len) memset(base + ret, 0, len - ret); |
1da177e4c Linux-2.6.12-rc2 |
1131 |
|
1da177e4c Linux-2.6.12-rc2 |
1132 1133 1134 1135 1136 |
} return 0; error_free: |
7223bb4a8 mm: nommu: fix a ... |
1137 |
free_page_series(region->vm_start, region->vm_top); |
8feae1311 NOMMU: Make VMAs ... |
1138 1139 |
region->vm_start = vma->vm_start = 0; region->vm_end = vma->vm_end = 0; |
dd8632a12 NOMMU: Make mmap ... |
1140 |
region->vm_top = 0; |
1da177e4c Linux-2.6.12-rc2 |
1141 1142 1143 |
return ret; enomem: |
b1de0d139 mm: convert some ... |
1144 1145 |
pr_err("Allocation of length %lu from process %d (%s) failed ", |
05ae6fa31 uclinux: add proc... |
1146 |
len, current->pid, current->comm); |
7bf02ea22 arch, mm: filter ... |
1147 |
show_free_areas(0); |
1da177e4c Linux-2.6.12-rc2 |
1148 1149 1150 1151 1152 1153 |
return -ENOMEM; } /* * handle mapping creation for uClinux */ |
1fcfd8db7 mm, mpx: add "vm_... |
1154 1155 1156 1157 1158 1159 1160 1161 |
unsigned long do_mmap(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate) |
1da177e4c Linux-2.6.12-rc2 |
1162 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1163 1164 |
struct vm_area_struct *vma; struct vm_region *region; |
1da177e4c Linux-2.6.12-rc2 |
1165 |
struct rb_node *rb; |
1fcfd8db7 mm, mpx: add "vm_... |
1166 |
unsigned long capabilities, result; |
1da177e4c Linux-2.6.12-rc2 |
1167 |
int ret; |
41badc15c mm: make do_mmap_... |
1168 |
*populate = 0; |
bebeb3d68 mm: introduce mm_... |
1169 |
|
1da177e4c Linux-2.6.12-rc2 |
1170 1171 1172 1173 |
/* decide whether we should attempt the mapping, and if so what sort of * mapping */ ret = validate_mmap_request(file, addr, len, prot, flags, pgoff, &capabilities); |
22cc877b3 mm: nommu: refact... |
1174 |
if (ret < 0) |
1da177e4c Linux-2.6.12-rc2 |
1175 |
return ret; |
06aab5a30 NOMMU: Ignore mma... |
1176 1177 |
/* we ignore the address hint */ addr = 0; |
f67d9b157 nommu: add page a... |
1178 |
len = PAGE_ALIGN(len); |
06aab5a30 NOMMU: Ignore mma... |
1179 |
|
1da177e4c Linux-2.6.12-rc2 |
1180 1181 |
/* we've determined that we can make the mapping, now translate what we * now know into VMA flags */ |
1fcfd8db7 mm, mpx: add "vm_... |
1182 |
vm_flags |= determine_vm_flags(file, prot, flags, capabilities); |
1da177e4c Linux-2.6.12-rc2 |
1183 |
|
8feae1311 NOMMU: Make VMAs ... |
1184 1185 1186 1187 1188 1189 1190 1191 |
/* we're going to need to record the mapping */ region = kmem_cache_zalloc(vm_region_jar, GFP_KERNEL); if (!region) goto error_getting_region; vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); if (!vma) goto error_getting_vma; |
1da177e4c Linux-2.6.12-rc2 |
1192 |
|
1e2ae599d nommu: struct vm_... |
1193 |
region->vm_usage = 1; |
8feae1311 NOMMU: Make VMAs ... |
1194 1195 |
region->vm_flags = vm_flags; region->vm_pgoff = pgoff; |
5beb49305 mm: change anon_v... |
1196 |
INIT_LIST_HEAD(&vma->anon_vma_chain); |
8feae1311 NOMMU: Make VMAs ... |
1197 1198 |
vma->vm_flags = vm_flags; vma->vm_pgoff = pgoff; |
1da177e4c Linux-2.6.12-rc2 |
1199 |
|
8feae1311 NOMMU: Make VMAs ... |
1200 |
if (file) { |
cb0942b81 make get_file() r... |
1201 1202 |
region->vm_file = get_file(file); vma->vm_file = get_file(file); |
8feae1311 NOMMU: Make VMAs ... |
1203 1204 1205 1206 1207 |
} down_write(&nommu_region_sem); /* if we want to share, we need to check for regions created by other |
1da177e4c Linux-2.6.12-rc2 |
1208 |
* mmap() calls that overlap with our proposed mapping |
8feae1311 NOMMU: Make VMAs ... |
1209 |
* - we can only share with a superset match on most regular files |
1da177e4c Linux-2.6.12-rc2 |
1210 1211 1212 1213 1214 1215 |
* - shared mappings on character devices and memory backed files are * permitted to overlap inexactly as far as we are concerned for in * these cases, sharing is handled in the driver or filesystem rather * than here */ if (vm_flags & VM_MAYSHARE) { |
8feae1311 NOMMU: Make VMAs ... |
1216 1217 |
struct vm_region *pregion; unsigned long pglen, rpglen, pgend, rpgend, start; |
1da177e4c Linux-2.6.12-rc2 |
1218 |
|
8feae1311 NOMMU: Make VMAs ... |
1219 1220 |
pglen = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; pgend = pgoff + pglen; |
165b23927 [PATCH] NOMMU: ma... |
1221 |
|
8feae1311 NOMMU: Make VMAs ... |
1222 1223 |
for (rb = rb_first(&nommu_region_tree); rb; rb = rb_next(rb)) { pregion = rb_entry(rb, struct vm_region, vm_rb); |
1da177e4c Linux-2.6.12-rc2 |
1224 |
|
8feae1311 NOMMU: Make VMAs ... |
1225 |
if (!(pregion->vm_flags & VM_MAYSHARE)) |
1da177e4c Linux-2.6.12-rc2 |
1226 1227 1228 |
continue; /* search for overlapping mappings on the same file */ |
496ad9aa8 new helper: file_... |
1229 1230 |
if (file_inode(pregion->vm_file) != file_inode(file)) |
1da177e4c Linux-2.6.12-rc2 |
1231 |
continue; |
8feae1311 NOMMU: Make VMAs ... |
1232 |
if (pregion->vm_pgoff >= pgend) |
1da177e4c Linux-2.6.12-rc2 |
1233 |
continue; |
8feae1311 NOMMU: Make VMAs ... |
1234 1235 1236 1237 |
rpglen = pregion->vm_end - pregion->vm_start; rpglen = (rpglen + PAGE_SIZE - 1) >> PAGE_SHIFT; rpgend = pregion->vm_pgoff + rpglen; if (pgoff >= rpgend) |
1da177e4c Linux-2.6.12-rc2 |
1238 |
continue; |
8feae1311 NOMMU: Make VMAs ... |
1239 1240 1241 1242 1243 |
/* handle inexactly overlapping matches between * mappings */ if ((pregion->vm_pgoff != pgoff || rpglen != pglen) && !(pgoff >= pregion->vm_pgoff && pgend <= rpgend)) { /* new mapping is not a subset of the region */ |
b4caecd48 fs: introduce f_o... |
1244 |
if (!(capabilities & NOMMU_MAP_DIRECT)) |
1da177e4c Linux-2.6.12-rc2 |
1245 1246 1247 |
goto sharing_violation; continue; } |
8feae1311 NOMMU: Make VMAs ... |
1248 |
/* we've found a region we can share */ |
1e2ae599d nommu: struct vm_... |
1249 |
pregion->vm_usage++; |
8feae1311 NOMMU: Make VMAs ... |
1250 1251 1252 1253 1254 |
vma->vm_region = pregion; start = pregion->vm_start; start += (pgoff - pregion->vm_pgoff) << PAGE_SHIFT; vma->vm_start = start; vma->vm_end = start + len; |
22cc877b3 mm: nommu: refact... |
1255 |
if (pregion->vm_flags & VM_MAPPED_COPY) |
8feae1311 NOMMU: Make VMAs ... |
1256 |
vma->vm_flags |= VM_MAPPED_COPY; |
22cc877b3 mm: nommu: refact... |
1257 |
else { |
8feae1311 NOMMU: Make VMAs ... |
1258 1259 1260 1261 1262 |
ret = do_mmap_shared_file(vma); if (ret < 0) { vma->vm_region = NULL; vma->vm_start = 0; vma->vm_end = 0; |
1e2ae599d nommu: struct vm_... |
1263 |
pregion->vm_usage--; |
8feae1311 NOMMU: Make VMAs ... |
1264 1265 1266 1267 1268 1269 1270 1271 1272 |
pregion = NULL; goto error_just_free; } } fput(region->vm_file); kmem_cache_free(vm_region_jar, region); region = pregion; result = start; goto share; |
1da177e4c Linux-2.6.12-rc2 |
1273 |
} |
1da177e4c Linux-2.6.12-rc2 |
1274 1275 1276 1277 |
/* obtain the address at which to make a shared mapping * - this is the hook for quasi-memory character devices to * tell us the location of a shared mapping */ |
b4caecd48 fs: introduce f_o... |
1278 |
if (capabilities & NOMMU_MAP_DIRECT) { |
1da177e4c Linux-2.6.12-rc2 |
1279 1280 |
addr = file->f_op->get_unmapped_area(file, addr, len, pgoff, flags); |
bb005a59e mm: nommu: fix a ... |
1281 |
if (IS_ERR_VALUE(addr)) { |
1da177e4c Linux-2.6.12-rc2 |
1282 |
ret = addr; |
bb005a59e mm: nommu: fix a ... |
1283 |
if (ret != -ENOSYS) |
8feae1311 NOMMU: Make VMAs ... |
1284 |
goto error_just_free; |
1da177e4c Linux-2.6.12-rc2 |
1285 1286 1287 1288 |
/* the driver refused to tell us where to site * the mapping so we'll have to attempt to copy * it */ |
bb005a59e mm: nommu: fix a ... |
1289 |
ret = -ENODEV; |
b4caecd48 fs: introduce f_o... |
1290 |
if (!(capabilities & NOMMU_MAP_COPY)) |
8feae1311 NOMMU: Make VMAs ... |
1291 |
goto error_just_free; |
1da177e4c Linux-2.6.12-rc2 |
1292 |
|
b4caecd48 fs: introduce f_o... |
1293 |
capabilities &= ~NOMMU_MAP_DIRECT; |
8feae1311 NOMMU: Make VMAs ... |
1294 1295 1296 |
} else { vma->vm_start = region->vm_start = addr; vma->vm_end = region->vm_end = addr + len; |
1da177e4c Linux-2.6.12-rc2 |
1297 1298 1299 |
} } } |
8feae1311 NOMMU: Make VMAs ... |
1300 |
vma->vm_region = region; |
1da177e4c Linux-2.6.12-rc2 |
1301 |
|
645d83c5d NOMMU: Fix MAP_PR... |
1302 |
/* set up the mapping |
b4caecd48 fs: introduce f_o... |
1303 |
* - the region is filled in if NOMMU_MAP_DIRECT is still set |
645d83c5d NOMMU: Fix MAP_PR... |
1304 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1305 |
if (file && vma->vm_flags & VM_SHARED) |
8feae1311 NOMMU: Make VMAs ... |
1306 |
ret = do_mmap_shared_file(vma); |
1da177e4c Linux-2.6.12-rc2 |
1307 |
else |
645d83c5d NOMMU: Fix MAP_PR... |
1308 |
ret = do_mmap_private(vma, region, len, capabilities); |
1da177e4c Linux-2.6.12-rc2 |
1309 |
if (ret < 0) |
645d83c5d NOMMU: Fix MAP_PR... |
1310 1311 |
goto error_just_free; add_nommu_region(region); |
8feae1311 NOMMU: Make VMAs ... |
1312 |
|
ea6376395 nommu: fix malloc... |
1313 1314 1315 1316 |
/* clear anonymous mappings that don't ask for uninitialized data */ if (!vma->vm_file && !(flags & MAP_UNINITIALIZED)) memset((void *)region->vm_start, 0, region->vm_end - region->vm_start); |
1da177e4c Linux-2.6.12-rc2 |
1317 |
/* okay... we have a mapping; now we have to register it */ |
8feae1311 NOMMU: Make VMAs ... |
1318 |
result = vma->vm_start; |
1da177e4c Linux-2.6.12-rc2 |
1319 |
|
1da177e4c Linux-2.6.12-rc2 |
1320 |
current->mm->total_vm += len >> PAGE_SHIFT; |
8feae1311 NOMMU: Make VMAs ... |
1321 1322 |
share: add_vma_to_mm(current->mm, vma); |
1da177e4c Linux-2.6.12-rc2 |
1323 |
|
cfe79c00a NOMMU: Avoiding d... |
1324 1325 1326 1327 1328 1329 |
/* we flush the region from the icache only when the first executable * mapping of it is made */ if (vma->vm_flags & VM_EXEC && !region->vm_icache_flushed) { flush_icache_range(region->vm_start, region->vm_end); region->vm_icache_flushed = true; } |
1da177e4c Linux-2.6.12-rc2 |
1330 |
|
cfe79c00a NOMMU: Avoiding d... |
1331 |
up_write(&nommu_region_sem); |
1da177e4c Linux-2.6.12-rc2 |
1332 |
|
8feae1311 NOMMU: Make VMAs ... |
1333 |
return result; |
1da177e4c Linux-2.6.12-rc2 |
1334 |
|
8feae1311 NOMMU: Make VMAs ... |
1335 1336 1337 |
error_just_free: up_write(&nommu_region_sem); error: |
89a864027 NOMMU: Don't pass... |
1338 1339 |
if (region->vm_file) fput(region->vm_file); |
8feae1311 NOMMU: Make VMAs ... |
1340 |
kmem_cache_free(vm_region_jar, region); |
89a864027 NOMMU: Don't pass... |
1341 1342 |
if (vma->vm_file) fput(vma->vm_file); |
8feae1311 NOMMU: Make VMAs ... |
1343 |
kmem_cache_free(vm_area_cachep, vma); |
8feae1311 NOMMU: Make VMAs ... |
1344 1345 1346 1347 |
return ret; sharing_violation: up_write(&nommu_region_sem); |
22cc877b3 mm: nommu: refact... |
1348 1349 |
pr_warn("Attempt to share mismatched mappings "); |
8feae1311 NOMMU: Make VMAs ... |
1350 1351 |
ret = -EINVAL; goto error; |
1da177e4c Linux-2.6.12-rc2 |
1352 |
|
8feae1311 NOMMU: Make VMAs ... |
1353 1354 |
error_getting_vma: kmem_cache_free(vm_region_jar, region); |
22cc877b3 mm: nommu: refact... |
1355 1356 1357 |
pr_warn("Allocation of vma for %lu byte allocation from process %d failed ", len, current->pid); |
7bf02ea22 arch, mm: filter ... |
1358 |
show_free_areas(0); |
1da177e4c Linux-2.6.12-rc2 |
1359 |
return -ENOMEM; |
8feae1311 NOMMU: Make VMAs ... |
1360 |
error_getting_region: |
22cc877b3 mm: nommu: refact... |
1361 1362 1363 |
pr_warn("Allocation of vm region for %lu byte allocation from process %d failed ", len, current->pid); |
7bf02ea22 arch, mm: filter ... |
1364 |
show_free_areas(0); |
1da177e4c Linux-2.6.12-rc2 |
1365 1366 |
return -ENOMEM; } |
6be5ceb02 VM: add "vm_mmap(... |
1367 |
|
66f0dc481 mm: move sys_mmap... |
1368 1369 1370 1371 1372 1373 |
SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len, unsigned long, prot, unsigned long, flags, unsigned long, fd, unsigned long, pgoff) { struct file *file = NULL; unsigned long retval = -EBADF; |
120a795da audit mmap |
1374 |
audit_mmap_fd(fd, flags); |
66f0dc481 mm: move sys_mmap... |
1375 1376 1377 1378 1379 1380 1381 |
if (!(flags & MAP_ANONYMOUS)) { file = fget(fd); if (!file) goto out; } flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); |
ad1ed2937 nommu: fix compil... |
1382 |
retval = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff); |
66f0dc481 mm: move sys_mmap... |
1383 1384 1385 1386 1387 1388 |
if (file) fput(file); out: return retval; } |
a4679373c Add generic sys_o... |
1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 |
#ifdef __ARCH_WANT_SYS_OLD_MMAP struct mmap_arg_struct { unsigned long addr; unsigned long len; unsigned long prot; unsigned long flags; unsigned long fd; unsigned long offset; }; SYSCALL_DEFINE1(old_mmap, struct mmap_arg_struct __user *, arg) { struct mmap_arg_struct a; if (copy_from_user(&a, arg, sizeof(a))) return -EFAULT; |
1824cb753 mm/nommu: use off... |
1405 |
if (offset_in_page(a.offset)) |
a4679373c Add generic sys_o... |
1406 1407 1408 1409 1410 1411 |
return -EINVAL; return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); } #endif /* __ARCH_WANT_SYS_OLD_MMAP */ |
1da177e4c Linux-2.6.12-rc2 |
1412 |
/* |
8feae1311 NOMMU: Make VMAs ... |
1413 1414 |
* split a vma into two pieces at address 'addr', a new vma is allocated either * for the first part or the tail. |
1da177e4c Linux-2.6.12-rc2 |
1415 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
1416 1417 |
int split_vma(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, int new_below) |
1da177e4c Linux-2.6.12-rc2 |
1418 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1419 1420 1421 |
struct vm_area_struct *new; struct vm_region *region; unsigned long npages; |
1da177e4c Linux-2.6.12-rc2 |
1422 |
|
779c10232 nommu: remove a s... |
1423 1424 1425 |
/* we're only permitted to split anonymous regions (these should have * only a single usage on the region) */ if (vma->vm_file) |
8feae1311 NOMMU: Make VMAs ... |
1426 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1427 |
|
8feae1311 NOMMU: Make VMAs ... |
1428 1429 |
if (mm->map_count >= sysctl_max_map_count) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1430 |
|
8feae1311 NOMMU: Make VMAs ... |
1431 1432 1433 |
region = kmem_cache_alloc(vm_region_jar, GFP_KERNEL); if (!region) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1434 |
|
8feae1311 NOMMU: Make VMAs ... |
1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 |
new = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL); if (!new) { kmem_cache_free(vm_region_jar, region); return -ENOMEM; } /* most fields are the same, copy all, and then fixup */ *new = *vma; *region = *vma->vm_region; new->vm_region = region; npages = (addr - vma->vm_start) >> PAGE_SHIFT; if (new_below) { |
dd8632a12 NOMMU: Make mmap ... |
1449 |
region->vm_top = region->vm_end = new->vm_end = addr; |
8feae1311 NOMMU: Make VMAs ... |
1450 1451 1452 |
} else { region->vm_start = new->vm_start = addr; region->vm_pgoff = new->vm_pgoff += npages; |
1da177e4c Linux-2.6.12-rc2 |
1453 |
} |
8feae1311 NOMMU: Make VMAs ... |
1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 |
if (new->vm_ops && new->vm_ops->open) new->vm_ops->open(new); delete_vma_from_mm(vma); down_write(&nommu_region_sem); delete_nommu_region(vma->vm_region); if (new_below) { vma->vm_region->vm_start = vma->vm_start = addr; vma->vm_region->vm_pgoff = vma->vm_pgoff += npages; } else { vma->vm_region->vm_end = vma->vm_end = addr; |
dd8632a12 NOMMU: Make mmap ... |
1466 |
vma->vm_region->vm_top = addr; |
8feae1311 NOMMU: Make VMAs ... |
1467 1468 1469 1470 1471 1472 1473 |
} add_nommu_region(vma->vm_region); add_nommu_region(new->vm_region); up_write(&nommu_region_sem); add_vma_to_mm(mm, vma); add_vma_to_mm(mm, new); return 0; |
1da177e4c Linux-2.6.12-rc2 |
1474 |
} |
3034097a5 [PATCH] NOMMU: Or... |
1475 |
/* |
8feae1311 NOMMU: Make VMAs ... |
1476 1477 |
* shrink a VMA by removing the specified chunk from either the beginning or * the end |
3034097a5 [PATCH] NOMMU: Or... |
1478 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
1479 1480 1481 |
static int shrink_vma(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long from, unsigned long to) |
1da177e4c Linux-2.6.12-rc2 |
1482 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1483 |
struct vm_region *region; |
1da177e4c Linux-2.6.12-rc2 |
1484 |
|
8feae1311 NOMMU: Make VMAs ... |
1485 1486 1487 1488 1489 1490 1491 1492 |
/* adjust the VMA's pointers, which may reposition it in the MM's tree * and list */ delete_vma_from_mm(vma); if (from > vma->vm_start) vma->vm_end = from; else vma->vm_start = to; add_vma_to_mm(mm, vma); |
1da177e4c Linux-2.6.12-rc2 |
1493 |
|
8feae1311 NOMMU: Make VMAs ... |
1494 1495 |
/* cut the backing region down to size */ region = vma->vm_region; |
1e2ae599d nommu: struct vm_... |
1496 |
BUG_ON(region->vm_usage != 1); |
8feae1311 NOMMU: Make VMAs ... |
1497 1498 1499 |
down_write(&nommu_region_sem); delete_nommu_region(region); |
dd8632a12 NOMMU: Make mmap ... |
1500 1501 1502 1503 |
if (from > region->vm_start) { to = region->vm_top; region->vm_top = region->vm_end = from; } else { |
8feae1311 NOMMU: Make VMAs ... |
1504 |
region->vm_start = to; |
dd8632a12 NOMMU: Make mmap ... |
1505 |
} |
8feae1311 NOMMU: Make VMAs ... |
1506 1507 1508 1509 1510 1511 |
add_nommu_region(region); up_write(&nommu_region_sem); free_page_series(from, to); return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1512 |
|
8feae1311 NOMMU: Make VMAs ... |
1513 1514 1515 1516 1517 1518 1519 1520 |
/* * release a mapping * - under NOMMU conditions the chunk to be unmapped must be backed by a single * VMA, though it need not cover the whole VMA */ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len) { struct vm_area_struct *vma; |
f67d9b157 nommu: add page a... |
1521 |
unsigned long end; |
8feae1311 NOMMU: Make VMAs ... |
1522 |
int ret; |
1da177e4c Linux-2.6.12-rc2 |
1523 |
|
f67d9b157 nommu: add page a... |
1524 |
len = PAGE_ALIGN(len); |
8feae1311 NOMMU: Make VMAs ... |
1525 1526 |
if (len == 0) return -EINVAL; |
365e9c87a [PATCH] mm: updat... |
1527 |
|
f67d9b157 nommu: add page a... |
1528 |
end = start + len; |
8feae1311 NOMMU: Make VMAs ... |
1529 1530 1531 |
/* find the first potentially overlapping VMA */ vma = find_vma(mm, start); if (!vma) { |
ac7149045 mm: fix 'ERROR: d... |
1532 |
static int limit; |
33e5d7697 nommu: fix a numb... |
1533 |
if (limit < 5) { |
22cc877b3 mm: nommu: refact... |
1534 1535 1536 1537 |
pr_warn("munmap of memory not mmapped by process %d (%s): 0x%lx-0x%lx ", current->pid, current->comm, start, start + len - 1); |
33e5d7697 nommu: fix a numb... |
1538 1539 |
limit++; } |
8feae1311 NOMMU: Make VMAs ... |
1540 1541 |
return -EINVAL; } |
1da177e4c Linux-2.6.12-rc2 |
1542 |
|
8feae1311 NOMMU: Make VMAs ... |
1543 1544 1545 |
/* we're allowed to split an anonymous VMA but not a file-backed one */ if (vma->vm_file) { do { |
22cc877b3 mm: nommu: refact... |
1546 |
if (start > vma->vm_start) |
8feae1311 NOMMU: Make VMAs ... |
1547 |
return -EINVAL; |
8feae1311 NOMMU: Make VMAs ... |
1548 1549 |
if (end == vma->vm_end) goto erase_whole_vma; |
d75a310c4 mm: nommu: check ... |
1550 1551 |
vma = vma->vm_next; } while (vma); |
8feae1311 NOMMU: Make VMAs ... |
1552 1553 1554 1555 1556 |
return -EINVAL; } else { /* the chunk must be a subset of the VMA found */ if (start == vma->vm_start && end == vma->vm_end) goto erase_whole_vma; |
22cc877b3 mm: nommu: refact... |
1557 |
if (start < vma->vm_start || end > vma->vm_end) |
8feae1311 NOMMU: Make VMAs ... |
1558 |
return -EINVAL; |
1824cb753 mm/nommu: use off... |
1559 |
if (offset_in_page(start)) |
8feae1311 NOMMU: Make VMAs ... |
1560 |
return -EINVAL; |
1824cb753 mm/nommu: use off... |
1561 |
if (end != vma->vm_end && offset_in_page(end)) |
8feae1311 NOMMU: Make VMAs ... |
1562 |
return -EINVAL; |
8feae1311 NOMMU: Make VMAs ... |
1563 1564 |
if (start != vma->vm_start && end != vma->vm_end) { ret = split_vma(mm, vma, start, 1); |
22cc877b3 mm: nommu: refact... |
1565 |
if (ret < 0) |
8feae1311 NOMMU: Make VMAs ... |
1566 |
return ret; |
8feae1311 NOMMU: Make VMAs ... |
1567 1568 1569 |
} return shrink_vma(mm, vma, start, end); } |
1da177e4c Linux-2.6.12-rc2 |
1570 |
|
8feae1311 NOMMU: Make VMAs ... |
1571 1572 1573 |
erase_whole_vma: delete_vma_from_mm(vma); delete_vma(mm, vma); |
1da177e4c Linux-2.6.12-rc2 |
1574 1575 |
return 0; } |
b50731732 nommu: vmalloc_32... |
1576 |
EXPORT_SYMBOL(do_munmap); |
1da177e4c Linux-2.6.12-rc2 |
1577 |
|
bfce281c2 kill mm argument ... |
1578 |
int vm_munmap(unsigned long addr, size_t len) |
3034097a5 [PATCH] NOMMU: Or... |
1579 |
{ |
bfce281c2 kill mm argument ... |
1580 |
struct mm_struct *mm = current->mm; |
3034097a5 [PATCH] NOMMU: Or... |
1581 |
int ret; |
3034097a5 [PATCH] NOMMU: Or... |
1582 1583 1584 1585 1586 1587 |
down_write(&mm->mmap_sem); ret = do_munmap(mm, addr, len); up_write(&mm->mmap_sem); return ret; } |
a46ef99d8 VM: add "vm_munma... |
1588 1589 1590 1591 |
EXPORT_SYMBOL(vm_munmap); SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len) { |
bfce281c2 kill mm argument ... |
1592 |
return vm_munmap(addr, len); |
a46ef99d8 VM: add "vm_munma... |
1593 |
} |
3034097a5 [PATCH] NOMMU: Or... |
1594 1595 |
/* |
8feae1311 NOMMU: Make VMAs ... |
1596 |
* release all the mappings made in a process's VM space |
3034097a5 [PATCH] NOMMU: Or... |
1597 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
1598 |
void exit_mmap(struct mm_struct *mm) |
1da177e4c Linux-2.6.12-rc2 |
1599 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1600 |
struct vm_area_struct *vma; |
1da177e4c Linux-2.6.12-rc2 |
1601 |
|
8feae1311 NOMMU: Make VMAs ... |
1602 1603 |
if (!mm) return; |
1da177e4c Linux-2.6.12-rc2 |
1604 |
|
8feae1311 NOMMU: Make VMAs ... |
1605 |
mm->total_vm = 0; |
1da177e4c Linux-2.6.12-rc2 |
1606 |
|
8feae1311 NOMMU: Make VMAs ... |
1607 1608 1609 1610 |
while ((vma = mm->mmap)) { mm->mmap = vma->vm_next; delete_vma_from_mm(vma); delete_vma(mm, vma); |
04c349615 nommu: yield CPU ... |
1611 |
cond_resched(); |
1da177e4c Linux-2.6.12-rc2 |
1612 1613 |
} } |
5d22fc25d mm: remove more I... |
1614 |
int vm_brk(unsigned long addr, unsigned long len) |
1da177e4c Linux-2.6.12-rc2 |
1615 1616 1617 1618 1619 |
{ return -ENOMEM; } /* |
6fa5f80bc [PATCH] NOMMU: Ma... |
1620 1621 |
* expand (or shrink) an existing mapping, potentially moving it at the same * time (controlled by the MREMAP_MAYMOVE flag and available VM space) |
1da177e4c Linux-2.6.12-rc2 |
1622 |
* |
6fa5f80bc [PATCH] NOMMU: Ma... |
1623 |
* under NOMMU conditions, we only permit changing a mapping's size, and only |
8feae1311 NOMMU: Make VMAs ... |
1624 1625 |
* as long as it stays within the region allocated by do_mmap_private() and the * block is not shareable |
1da177e4c Linux-2.6.12-rc2 |
1626 |
* |
6fa5f80bc [PATCH] NOMMU: Ma... |
1627 |
* MREMAP_FIXED is not supported under NOMMU conditions |
1da177e4c Linux-2.6.12-rc2 |
1628 |
*/ |
4b377bab2 make do_mremap() ... |
1629 |
static unsigned long do_mremap(unsigned long addr, |
1da177e4c Linux-2.6.12-rc2 |
1630 1631 1632 |
unsigned long old_len, unsigned long new_len, unsigned long flags, unsigned long new_addr) { |
6fa5f80bc [PATCH] NOMMU: Ma... |
1633 |
struct vm_area_struct *vma; |
1da177e4c Linux-2.6.12-rc2 |
1634 1635 |
/* insanity checks first */ |
f67d9b157 nommu: add page a... |
1636 1637 |
old_len = PAGE_ALIGN(old_len); new_len = PAGE_ALIGN(new_len); |
8feae1311 NOMMU: Make VMAs ... |
1638 |
if (old_len == 0 || new_len == 0) |
1da177e4c Linux-2.6.12-rc2 |
1639 |
return (unsigned long) -EINVAL; |
1824cb753 mm/nommu: use off... |
1640 |
if (offset_in_page(addr)) |
8feae1311 NOMMU: Make VMAs ... |
1641 |
return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1642 1643 |
if (flags & MREMAP_FIXED && new_addr != addr) return (unsigned long) -EINVAL; |
8feae1311 NOMMU: Make VMAs ... |
1644 |
vma = find_vma_exact(current->mm, addr, old_len); |
6fa5f80bc [PATCH] NOMMU: Ma... |
1645 1646 |
if (!vma) return (unsigned long) -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1647 |
|
6fa5f80bc [PATCH] NOMMU: Ma... |
1648 |
if (vma->vm_end != vma->vm_start + old_len) |
1da177e4c Linux-2.6.12-rc2 |
1649 |
return (unsigned long) -EFAULT; |
6fa5f80bc [PATCH] NOMMU: Ma... |
1650 |
if (vma->vm_flags & VM_MAYSHARE) |
1da177e4c Linux-2.6.12-rc2 |
1651 |
return (unsigned long) -EPERM; |
8feae1311 NOMMU: Make VMAs ... |
1652 |
if (new_len > vma->vm_region->vm_end - vma->vm_region->vm_start) |
1da177e4c Linux-2.6.12-rc2 |
1653 1654 1655 |
return (unsigned long) -ENOMEM; /* all checks complete - do it */ |
6fa5f80bc [PATCH] NOMMU: Ma... |
1656 |
vma->vm_end = vma->vm_start + new_len; |
6fa5f80bc [PATCH] NOMMU: Ma... |
1657 1658 |
return vma->vm_start; } |
6a6160a7b [CVE-2009-0029] S... |
1659 1660 1661 |
SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, unsigned long, new_len, unsigned long, flags, unsigned long, new_addr) |
6fa5f80bc [PATCH] NOMMU: Ma... |
1662 1663 1664 1665 1666 1667 1668 |
{ unsigned long ret; down_write(¤t->mm->mmap_sem); ret = do_mremap(addr, old_len, new_len, flags, new_addr); up_write(¤t->mm->mmap_sem); return ret; |
1da177e4c Linux-2.6.12-rc2 |
1669 |
} |
240aadeed mm: accelerate mm... |
1670 1671 1672 |
struct page *follow_page_mask(struct vm_area_struct *vma, unsigned long address, unsigned int flags, unsigned int *page_mask) |
1da177e4c Linux-2.6.12-rc2 |
1673 |
{ |
240aadeed mm: accelerate mm... |
1674 |
*page_mask = 0; |
1da177e4c Linux-2.6.12-rc2 |
1675 1676 |
return NULL; } |
8f3b1327a mm/nommu.c: fix r... |
1677 1678 |
int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn, unsigned long size, pgprot_t prot) |
1da177e4c Linux-2.6.12-rc2 |
1679 |
{ |
8f3b1327a mm/nommu.c: fix r... |
1680 1681 |
if (addr != (pfn << PAGE_SHIFT)) return -EINVAL; |
314e51b98 mm: kill vma flag... |
1682 |
vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; |
66aa2b4b1 [PATCH] uclinux: ... |
1683 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1684 |
} |
22c4af409 [PATCH] nommu: ex... |
1685 |
EXPORT_SYMBOL(remap_pfn_range); |
1da177e4c Linux-2.6.12-rc2 |
1686 |
|
3c0b9de6d vm: add no-mmu vm... |
1687 1688 1689 1690 1691 1692 1693 1694 1695 |
int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len) { unsigned long pfn = start >> PAGE_SHIFT; unsigned long vm_len = vma->vm_end - vma->vm_start; pfn += vma->vm_pgoff; return io_remap_pfn_range(vma, vma->vm_start, pfn, vm_len, vma->vm_page_prot); } EXPORT_SYMBOL(vm_iomap_memory); |
f905bc447 nommu: add new vm... |
1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 |
int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, unsigned long pgoff) { unsigned int size = vma->vm_end - vma->vm_start; if (!(vma->vm_flags & VM_USERMAP)) return -EINVAL; vma->vm_start = (unsigned long)(addr + (pgoff << PAGE_SHIFT)); vma->vm_end = vma->vm_start + size; return 0; } EXPORT_SYMBOL(remap_vmalloc_range); |
1da177e4c Linux-2.6.12-rc2 |
1710 1711 1712 1713 1714 |
unsigned long arch_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { return -ENOMEM; } |
1da177e4c Linux-2.6.12-rc2 |
1715 1716 1717 1718 1719 |
void unmap_mapping_range(struct address_space *mapping, loff_t const holebegin, loff_t const holelen, int even_cows) { } |
22c4af409 [PATCH] nommu: ex... |
1720 |
EXPORT_SYMBOL(unmap_mapping_range); |
1da177e4c Linux-2.6.12-rc2 |
1721 |
|
d0217ac04 mm: fault feedbac... |
1722 |
int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
b0e15190e [PATCH] NOMMU: Ma... |
1723 1724 |
{ BUG(); |
d0217ac04 mm: fault feedbac... |
1725 |
return 0; |
b0e15190e [PATCH] NOMMU: Ma... |
1726 |
} |
b50731732 nommu: vmalloc_32... |
1727 |
EXPORT_SYMBOL(filemap_fault); |
0ec76a110 [PATCH] NOMMU: Ch... |
1728 |
|
bae473a42 mm: introduce fau... |
1729 1730 |
void filemap_map_pages(struct fault_env *fe, pgoff_t start_pgoff, pgoff_t end_pgoff) |
f1820361f mm: implement ->m... |
1731 1732 1733 1734 |
{ BUG(); } EXPORT_SYMBOL(filemap_map_pages); |
e71b4e061 ptrace: Don't all... |
1735 |
int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm, |
442486ec1 mm: replace __acc... |
1736 |
unsigned long addr, void *buf, int len, unsigned int gup_flags) |
0ec76a110 [PATCH] NOMMU: Ch... |
1737 |
{ |
0ec76a110 [PATCH] NOMMU: Ch... |
1738 |
struct vm_area_struct *vma; |
442486ec1 mm: replace __acc... |
1739 |
int write = gup_flags & FOLL_WRITE; |
0ec76a110 [PATCH] NOMMU: Ch... |
1740 1741 1742 1743 |
down_read(&mm->mmap_sem); /* the access must start within one of the target process's mappings */ |
0159b141d [PATCH] NOMMU: Us... |
1744 1745 |
vma = find_vma(mm, addr); if (vma) { |
0ec76a110 [PATCH] NOMMU: Ch... |
1746 1747 1748 1749 1750 |
/* don't overrun this mapping */ if (addr + len >= vma->vm_end) len = vma->vm_end - addr; /* only read or write mappings where it is permitted */ |
d00c7b993 [PATCH] NOMMU: Pe... |
1751 |
if (write && vma->vm_flags & VM_MAYWRITE) |
7959722b9 NOMMU: Use copy_*... |
1752 1753 |
copy_to_user_page(vma, NULL, addr, (void *) addr, buf, len); |
d00c7b993 [PATCH] NOMMU: Pe... |
1754 |
else if (!write && vma->vm_flags & VM_MAYREAD) |
7959722b9 NOMMU: Use copy_*... |
1755 1756 |
copy_from_user_page(vma, NULL, addr, buf, (void *) addr, len); |
0ec76a110 [PATCH] NOMMU: Ch... |
1757 1758 1759 1760 1761 1762 1763 |
else len = 0; } else { len = 0; } up_read(&mm->mmap_sem); |
f55f199b7 NOMMU: implement ... |
1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 |
return len; } /** * @access_remote_vm - access another process' address space * @mm: the mm_struct of the target address space * @addr: start address to access * @buf: source or destination buffer * @len: number of bytes to transfer |
6347e8d5b mm: replace acces... |
1774 |
* @gup_flags: flags modifying lookup behaviour |
f55f199b7 NOMMU: implement ... |
1775 1776 1777 1778 |
* * The caller must hold a reference on @mm. */ int access_remote_vm(struct mm_struct *mm, unsigned long addr, |
6347e8d5b mm: replace acces... |
1779 |
void *buf, int len, unsigned int gup_flags) |
f55f199b7 NOMMU: implement ... |
1780 |
{ |
6347e8d5b mm: replace acces... |
1781 |
return __access_remote_vm(NULL, mm, addr, buf, len, gup_flags); |
f55f199b7 NOMMU: implement ... |
1782 1783 1784 1785 1786 1787 |
} /* * Access another process' address space. * - source/target buffer must be kernel space */ |
f307ab6dc mm: replace acces... |
1788 1789 |
int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, unsigned int gup_flags) |
f55f199b7 NOMMU: implement ... |
1790 1791 1792 1793 1794 1795 1796 1797 1798 |
{ struct mm_struct *mm; if (addr + len < addr) return 0; mm = get_task_mm(tsk); if (!mm) return 0; |
f307ab6dc mm: replace acces... |
1799 |
len = __access_remote_vm(tsk, mm, addr, buf, len, gup_flags); |
f55f199b7 NOMMU: implement ... |
1800 |
|
0ec76a110 [PATCH] NOMMU: Ch... |
1801 1802 1803 |
mmput(mm); return len; } |
7e6608724 nommu: fix shared... |
1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 |
/** * nommu_shrink_inode_mappings - Shrink the shared mappings on an inode * @inode: The inode to check * @size: The current filesize of the inode * @newsize: The proposed filesize of the inode * * Check the shared mappings on an inode on behalf of a shrinking truncate to * make sure that that any outstanding VMAs aren't broken and then shrink the * vm_regions that extend that beyond so that do_mmap_pgoff() doesn't * automatically grant mappings that are too large. */ int nommu_shrink_inode_mappings(struct inode *inode, size_t size, size_t newsize) { struct vm_area_struct *vma; |
7e6608724 nommu: fix shared... |
1820 1821 1822 1823 1824 1825 1826 1827 |
struct vm_region *region; pgoff_t low, high; size_t r_size, r_top; low = newsize >> PAGE_SHIFT; high = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; down_write(&nommu_region_sem); |
1acf2e040 mm/nommu: share t... |
1828 |
i_mmap_lock_read(inode->i_mapping); |
7e6608724 nommu: fix shared... |
1829 1830 |
/* search for VMAs that fall within the dead zone */ |
6b2dbba8b mm: replace vma p... |
1831 |
vma_interval_tree_foreach(vma, &inode->i_mapping->i_mmap, low, high) { |
7e6608724 nommu: fix shared... |
1832 1833 1834 |
/* found one - only interested if it's shared out of the page * cache */ if (vma->vm_flags & VM_SHARED) { |
1acf2e040 mm/nommu: share t... |
1835 |
i_mmap_unlock_read(inode->i_mapping); |
7e6608724 nommu: fix shared... |
1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 |
up_write(&nommu_region_sem); return -ETXTBSY; /* not quite true, but near enough */ } } /* reduce any regions that overlap the dead zone - if in existence, * these will be pointed to by VMAs that don't overlap the dead zone * * we don't check for any regions that start beyond the EOF as there * shouldn't be any */ |
1acf2e040 mm/nommu: share t... |
1847 |
vma_interval_tree_foreach(vma, &inode->i_mapping->i_mmap, 0, ULONG_MAX) { |
7e6608724 nommu: fix shared... |
1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 |
if (!(vma->vm_flags & VM_SHARED)) continue; region = vma->vm_region; r_size = region->vm_top - region->vm_start; r_top = (region->vm_pgoff << PAGE_SHIFT) + r_size; if (r_top > newsize) { region->vm_top -= r_top - newsize; if (region->vm_end > region->vm_top) region->vm_end = region->vm_top; } } |
1acf2e040 mm/nommu: share t... |
1861 |
i_mmap_unlock_read(inode->i_mapping); |
7e6608724 nommu: fix shared... |
1862 1863 1864 |
up_write(&nommu_region_sem); return 0; } |
c9b1d0981 mm: limit growth ... |
1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 |
/* * Initialise sysctl_user_reserve_kbytes. * * This is intended to prevent a user from starting a single memory hogging * process, such that they cannot recover (kill the hog) in OVERCOMMIT_NEVER * mode. * * The default value is min(3% of free memory, 128MB) * 128MB is enough to recover with sshd/login, bash, and top/kill. */ static int __meminit init_user_reserve(void) { unsigned long free_kbytes; free_kbytes = global_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10); sysctl_user_reserve_kbytes = min(free_kbytes / 32, 1UL << 17); return 0; } |
a4bc6fc79 mm: replace modul... |
1885 |
subsys_initcall(init_user_reserve); |
4eeab4f55 mm: replace hardc... |
1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 |
/* * Initialise sysctl_admin_reserve_kbytes. * * The purpose of sysctl_admin_reserve_kbytes is to allow the sys admin * to log in and kill a memory hogging process. * * Systems with more than 256MB will reserve 8MB, enough to recover * with sshd, bash, and top in OVERCOMMIT_GUESS. Smaller systems will * only reserve 3% of free pages by default. */ static int __meminit init_admin_reserve(void) { unsigned long free_kbytes; free_kbytes = global_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10); sysctl_admin_reserve_kbytes = min(free_kbytes / 32, 1UL << 13); return 0; } |
a4bc6fc79 mm: replace modul... |
1906 |
subsys_initcall(init_admin_reserve); |