/*
* files that support invalidating or truncating portions of the
- * file from under mmaped areas must set the VM_CAN_INVALIDATE flag, and
- * have their .nopage function return the page locked.
+ * file from under mmaped areas must have their ->fault function
+ * return a locked page (and FAULT_RET_LOCKED code). This provides
+ * synchronisation against concurrent unmapping here.
*/
- BUG_ON(!(vma->vm_flags & VM_CAN_INVALIDATE));
again:
restart_addr = vma->vm_truncate_count;
pgoff_t pgoff, unsigned int flags, pte_t orig_pte)
{
spinlock_t *ptl;
- struct page *page, *faulted_page;
+ struct page *page;
pte_t entry;
int anon = 0;
struct page *dirty_page = NULL;
- struct fault_data fdata;
+ struct vm_fault vmf;
+ int ret;
- fdata.address = address & PAGE_MASK;
- fdata.pgoff = pgoff;
- fdata.flags = flags;
+ vmf.virtual_address = (void __user *)(address & PAGE_MASK);
+ vmf.pgoff = pgoff;
+ vmf.flags = flags;
+ vmf.page = NULL;
pte_unmap(page_table);
BUG_ON(vma->vm_flags & VM_PFNMAP);
if (likely(vma->vm_ops->fault)) {
- fdata.type = -1;
- faulted_page = vma->vm_ops->fault(vma, &fdata);
- WARN_ON(fdata.type == -1);
- if (unlikely(!faulted_page))
- return fdata.type;
+ ret = vma->vm_ops->fault(vma, &vmf);
+ if (unlikely(ret & (VM_FAULT_ERROR | FAULT_RET_NOPAGE)))
+ return (ret & VM_FAULT_MASK);
} else {
/* Legacy ->nopage path */
- fdata.type = VM_FAULT_MINOR;
- faulted_page = vma->vm_ops->nopage(vma, address & PAGE_MASK,
- &fdata.type);
+ ret = VM_FAULT_MINOR;
+ vmf.page = vma->vm_ops->nopage(vma, address & PAGE_MASK, &ret);
/* no page was available -- either SIGBUS or OOM */
- if (unlikely(faulted_page == NOPAGE_SIGBUS))
+ if (unlikely(vmf.page == NOPAGE_SIGBUS))
return VM_FAULT_SIGBUS;
- else if (unlikely(faulted_page == NOPAGE_OOM))
+ else if (unlikely(vmf.page == NOPAGE_OOM))
return VM_FAULT_OOM;
}
/*
- * For consistency in subsequent calls, make the faulted_page always
+ * For consistency in subsequent calls, make the faulted page always
* locked.
*/
- if (unlikely(!(vma->vm_flags & VM_CAN_INVALIDATE)))
- lock_page(faulted_page);
+ if (unlikely(!(ret & FAULT_RET_LOCKED)))
+ lock_page(vmf.page);
else
- BUG_ON(!PageLocked(faulted_page));
+ VM_BUG_ON(!PageLocked(vmf.page));
/*
* Should we do an early C-O-W break?
*/
- page = faulted_page;
+ page = vmf.page;
if (flags & FAULT_FLAG_WRITE) {
if (!(vma->vm_flags & VM_SHARED)) {
anon = 1;
if (unlikely(anon_vma_prepare(vma))) {
- fdata.type = VM_FAULT_OOM;
+ ret = VM_FAULT_OOM;
goto out;
}
page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
if (!page) {
- fdata.type = VM_FAULT_OOM;
+ ret = VM_FAULT_OOM;
goto out;
}
- copy_user_highpage(page, faulted_page, address, vma);
+ copy_user_highpage(page, vmf.page, address, vma);
} else {
/*
* If the page will be shareable, see if the backing
if (vma->vm_ops->page_mkwrite) {
unlock_page(page);
if (vma->vm_ops->page_mkwrite(vma, page) < 0) {
- fdata.type = VM_FAULT_SIGBUS;
- anon = 1; /* no anon but release faulted_page */
+ ret = VM_FAULT_SIGBUS;
+ anon = 1; /* no anon but release vmf.page */
goto out_unlocked;
}
lock_page(page);
+ /*
+ * XXX: this is not quite right (racy vs
+ * invalidate) to unlock and relock the page
+ * like this, however a better fix requires
+ * reworking page_mkwrite locking API, which
+ * is better done later.
+ */
+ if (!page->mapping) {
+ ret = VM_FAULT_MINOR;
+ anon = 1; /* no anon but release vmf.page */
+ goto out;
+ }
}
}
pte_unmap_unlock(page_table, ptl);
out:
- unlock_page(faulted_page);
+ unlock_page(vmf.page);
out_unlocked:
if (anon)
- page_cache_release(faulted_page);
+ page_cache_release(vmf.page);
else if (dirty_page) {
set_page_dirty_balance(dirty_page);
put_page(dirty_page);
}
- return fdata.type;
+ return (ret & VM_FAULT_MASK);
}
static int do_linear_fault(struct mm_struct *mm, struct vm_area_struct *vma,
- vma->vm_start) >> PAGE_CACHE_SHIFT) + vma->vm_pgoff;
unsigned int flags = (write_access ? FAULT_FLAG_WRITE : 0);
- return __do_fault(mm, vma, address, page_table, pmd, pgoff, flags, orig_pte);
+ return __do_fault(mm, vma, address, page_table, pmd, pgoff,
+ flags, orig_pte);
}
-static int do_nonlinear_fault(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pte_t *page_table, pmd_t *pmd,
- int write_access, pgoff_t pgoff, pte_t orig_pte)
-{
- unsigned int flags = FAULT_FLAG_NONLINEAR |
- (write_access ? FAULT_FLAG_WRITE : 0);
-
- return __do_fault(mm, vma, address, page_table, pmd, pgoff, flags, orig_pte);
-}
/*
* do_no_pfn() tries to create a new page mapping for a page without
* but allow concurrent faults), and pte mapped but not yet locked.
* We return with mmap_sem still held, but pte unmapped and unlocked.
*/
-static int do_file_page(struct mm_struct *mm, struct vm_area_struct *vma,
+static int do_nonlinear_fault(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, pte_t *page_table, pmd_t *pmd,
int write_access, pte_t orig_pte)
{
+ unsigned int flags = FAULT_FLAG_NONLINEAR |
+ (write_access ? FAULT_FLAG_WRITE : 0);
pgoff_t pgoff;
- int err;
if (!pte_unmap_same(mm, pmd, page_table, orig_pte))
return VM_FAULT_MINOR;
- if (unlikely(!(vma->vm_flags & VM_NONLINEAR))) {
+ if (unlikely(!(vma->vm_flags & VM_NONLINEAR) ||
+ !(vma->vm_flags & VM_CAN_NONLINEAR))) {
/*
* Page table corrupted: show pte and kill process.
*/
pgoff = pte_to_pgoff(orig_pte);
- if (vma->vm_ops && vma->vm_ops->fault)
- return do_nonlinear_fault(mm, vma, address, page_table, pmd,
- write_access, pgoff, orig_pte);
-
- /* We can then assume vm->vm_ops && vma->vm_ops->populate */
- err = vma->vm_ops->populate(vma, address & PAGE_MASK, PAGE_SIZE,
- vma->vm_page_prot, pgoff, 0);
- if (err == -ENOMEM)
- return VM_FAULT_OOM;
- if (err)
- return VM_FAULT_SIGBUS;
- return VM_FAULT_MAJOR;
+ return __do_fault(mm, vma, address, page_table, pmd, pgoff,
+ flags, orig_pte);
}
/*
pte, pmd, write_access);
}
if (pte_file(entry))
- return do_file_page(mm, vma, address,
+ return do_nonlinear_fault(mm, vma, address,
pte, pmd, write_access, entry);
return do_swap_page(mm, vma, address,
pte, pmd, write_access, entry);
projects / linux-2.6-omap-h63xx.git / blobdiff