#include <asm/tlb.h>
#include <asm/mmu_context.h>
+#include "internal.h"
+
#ifndef arch_mmap_check
#define arch_mmap_check(addr, len, flags) (0)
#endif
+#ifndef arch_rebalance_pgtables
+#define arch_rebalance_pgtables(addr, len) (addr)
+#endif
+
static void unmap_region(struct mm_struct *mm,
struct vm_area_struct *vma, struct vm_area_struct *prev,
unsigned long start, unsigned long end);
pgprot_t vm_get_page_prot(unsigned long vm_flags)
{
- return protection_map[vm_flags &
- (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)];
+ return __pgprot(pgprot_val(protection_map[vm_flags &
+ (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]) |
+ pgprot_val(arch_vm_get_page_prot(vm_flags)));
}
EXPORT_SYMBOL(vm_get_page_prot);
int sysctl_overcommit_memory = OVERCOMMIT_GUESS; /* heuristic overcommit */
int sysctl_overcommit_ratio = 50; /* default is 50% */
int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT;
-atomic_t vm_committed_space = ATOMIC_INIT(0);
+atomic_long_t vm_committed_space = ATOMIC_LONG_INIT(0);
/*
* Check that a process has enough memory to allocate a new virtual
* cast `allowed' as a signed long because vm_committed_space
* sometimes has a negative value
*/
- if (atomic_read(&vm_committed_space) < (long)allowed)
+ if (atomic_long_read(&vm_committed_space) < (long)allowed)
return 0;
error:
vm_unacct_memory(pages);
might_sleep();
if (vma->vm_ops && vma->vm_ops->close)
vma->vm_ops->close(vma);
- if (vma->vm_file)
+ if (vma->vm_file) {
fput(vma->vm_file);
- mpol_free(vma_policy(vma));
+ if (vma->vm_flags & VM_EXECUTABLE)
+ removed_exe_file_vma(vma->vm_mm);
+ }
+ mpol_put(vma_policy(vma));
kmem_cache_free(vm_area_cachep, vma);
return next;
}
unsigned long rlim, retval;
unsigned long newbrk, oldbrk;
struct mm_struct *mm = current->mm;
+ unsigned long min_brk;
down_write(&mm->mmap_sem);
- if (brk < mm->end_code)
+#ifdef CONFIG_COMPAT_BRK
+ min_brk = mm->end_code;
+#else
+ min_brk = mm->start_brk;
+#endif
+ if (brk < min_brk)
goto out;
/*
* not page aligned -Ram Gupta
*/
rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
- if (rlim < RLIM_INFINITY && brk - mm->start_data > rlim)
+ if (rlim < RLIM_INFINITY && (brk - mm->start_brk) +
+ (mm->end_data - mm->start_data) > rlim)
goto out;
newbrk = PAGE_ALIGN(brk);
spin_unlock(&mapping->i_mmap_lock);
if (remove_next) {
- if (file)
+ if (file) {
fput(file);
+ if (next->vm_flags & VM_EXECUTABLE)
+ removed_exe_file_vma(mm);
+ }
mm->map_count--;
- mpol_free(vma_policy(next));
+ mpol_put(vma_policy(next));
kmem_cache_free(vm_area_cachep, next);
/*
* In mprotect's case 6 (see comments on vma_merge),
mapping_cap_account_dirty(vma->vm_file->f_mapping);
}
-
unsigned long mmap_region(struct file *file, unsigned long addr,
unsigned long len, unsigned long flags,
unsigned int vm_flags, unsigned long pgoff,
if (!may_expand_vm(mm, len >> PAGE_SHIFT))
return -ENOMEM;
+ if (flags & MAP_NORESERVE)
+ vm_flags |= VM_NORESERVE;
+
if (accountable && (!(flags & MAP_NORESERVE) ||
sysctl_overcommit_memory == OVERCOMMIT_NEVER)) {
if (vm_flags & VM_SHARED) {
error = file->f_op->mmap(file, vma);
if (error)
goto unmap_and_free_vma;
+ if (vm_flags & VM_EXECUTABLE)
+ added_exe_file_vma(mm);
} else if (vm_flags & VM_SHARED) {
error = shmem_zero_setup(vma);
if (error)
if (vma_wants_writenotify(vma))
vma->vm_page_prot = vm_get_page_prot(vm_flags & ~VM_SHARED);
- if (!file || !vma_merge(mm, prev, addr, vma->vm_end,
+ if (file && vma_merge(mm, prev, addr, vma->vm_end,
vma->vm_flags, NULL, file, pgoff, vma_policy(vma))) {
- file = vma->vm_file;
- vma_link(mm, vma, prev, rb_link, rb_parent);
- if (correct_wcount)
- atomic_inc(&inode->i_writecount);
- } else {
- if (file) {
- if (correct_wcount)
- atomic_inc(&inode->i_writecount);
- fput(file);
- }
- mpol_free(vma_policy(vma));
+ mpol_put(vma_policy(vma));
kmem_cache_free(vm_area_cachep, vma);
+ fput(file);
+ if (vm_flags & VM_EXECUTABLE)
+ removed_exe_file_vma(mm);
+ } else {
+ vma_link(mm, vma, prev, rb_link, rb_parent);
+ file = vma->vm_file;
}
-out:
+
+ /* Once vma denies write, undo our temporary denial count */
+ if (correct_wcount)
+ atomic_inc(&inode->i_writecount);
+out:
mm->total_vm += len >> PAGE_SHIFT;
vm_stat_account(mm, vm_flags, file, len >> PAGE_SHIFT);
if (vm_flags & VM_LOCKED) {
if (addr & ~PAGE_MASK)
return -EINVAL;
- return addr;
+ return arch_rebalance_pgtables(addr, len);
}
EXPORT_SYMBOL(get_unmapped_area);
return -ENOMEM;
address &= PAGE_MASK;
- error = security_file_mmap(0, 0, 0, 0, address, 1);
+ error = security_file_mmap(NULL, 0, 0, 0, address, 1);
if (error)
return error;
update_hiwater_rss(mm);
unmap_vmas(&tlb, vma, start, end, &nr_accounted, NULL);
vm_unacct_memory(nr_accounted);
- free_pgtables(&tlb, vma, prev? prev->vm_end: FIRST_USER_ADDRESS,
+ free_pgtables(tlb, vma, prev? prev->vm_end: FIRST_USER_ADDRESS,
next? next->vm_start: 0);
tlb_finish_mmu(tlb, start, end);
}
new->vm_pgoff += ((addr - vma->vm_start) >> PAGE_SHIFT);
}
- pol = mpol_copy(vma_policy(vma));
+ pol = mpol_dup(vma_policy(vma));
if (IS_ERR(pol)) {
kmem_cache_free(vm_area_cachep, new);
return PTR_ERR(pol);
}
vma_set_policy(new, pol);
- if (new->vm_file)
+ if (new->vm_file) {
get_file(new->vm_file);
+ if (vma->vm_flags & VM_EXECUTABLE)
+ added_exe_file_vma(mm);
+ }
if (new->vm_ops && new->vm_ops->open)
new->vm_ops->open(new);
if (is_hugepage_only_range(mm, addr, len))
return -EINVAL;
+ error = security_file_mmap(NULL, 0, 0, 0, addr, 1);
+ if (error)
+ return error;
+
flags = VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags;
error = arch_mmap_check(addr, len, flags);
/* Use -1 here to ensure all VMAs in the mm are unmapped */
end = unmap_vmas(&tlb, vma, 0, -1, &nr_accounted, NULL);
vm_unacct_memory(nr_accounted);
- free_pgtables(&tlb, vma, FIRST_USER_ADDRESS, 0);
+ free_pgtables(tlb, vma, FIRST_USER_ADDRESS, 0);
tlb_finish_mmu(tlb, 0, end);
/*
new_vma = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
if (new_vma) {
*new_vma = *vma;
- pol = mpol_copy(vma_policy(vma));
+ pol = mpol_dup(vma_policy(vma));
if (IS_ERR(pol)) {
kmem_cache_free(vm_area_cachep, new_vma);
return NULL;
new_vma->vm_start = addr;
new_vma->vm_end = addr + len;
new_vma->vm_pgoff = pgoff;
- if (new_vma->vm_file)
+ if (new_vma->vm_file) {
get_file(new_vma->vm_file);
+ if (vma->vm_flags & VM_EXECUTABLE)
+ added_exe_file_vma(mm);
+ }
if (new_vma->vm_ops && new_vma->vm_ops->open)
new_vma->vm_ops->open(new_vma);
vma_link(mm, new_vma, prev, rb_link, rb_parent);
}
-static struct page *special_mapping_nopage(struct vm_area_struct *vma,
- unsigned long address, int *type)
+static int special_mapping_fault(struct vm_area_struct *vma,
+ struct vm_fault *vmf)
{
+ pgoff_t pgoff;
struct page **pages;
- BUG_ON(address < vma->vm_start || address >= vma->vm_end);
+ /*
+ * special mappings have no vm_file, and in that case, the mm
+ * uses vm_pgoff internally. So we have to subtract it from here.
+ * We are allowed to do this because we are the mm; do not copy
+ * this code into drivers!
+ */
+ pgoff = vmf->pgoff - vma->vm_pgoff;
- address -= vma->vm_start;
- for (pages = vma->vm_private_data; address > 0 && *pages; ++pages)
- address -= PAGE_SIZE;
+ for (pages = vma->vm_private_data; pgoff && *pages; ++pages)
+ pgoff--;
if (*pages) {
struct page *page = *pages;
get_page(page);
- return page;
+ vmf->page = page;
+ return 0;
}
- return NOPAGE_SIGBUS;
+ return VM_FAULT_SIGBUS;
}
/*
static struct vm_operations_struct special_mapping_vmops = {
.close = special_mapping_close,
- .nopage = special_mapping_nopage,
+ .fault = special_mapping_fault,
};
/*
vma->vm_start = addr;
vma->vm_end = addr + len;
- vma->vm_flags = vm_flags | mm->def_flags;
+ vma->vm_flags = vm_flags | mm->def_flags | VM_DONTEXPAND;
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
vma->vm_ops = &special_mapping_vmops;
Code Review / linux-2.6.git / blobdiff