removed cwd "./" (refer to Bugzilla 14399).
Severity : minor
+Bugzilla : 15837
+Description: oops in page fault handler
+Details : kernel page fault handler can return two special 'pages' in error case, don't
+ try dereference NOPAGE_SIGBUS and NOPAGE_OMM.
+
+Severity : minor
Bugzilla : 15716
Description: timeout with invalidate import.
Details : ptlrpcd_check call obd_zombie_impexp_cull and wait request which should be
RETURN(0);
}
-/* FIXME: there is a pagefault race goes as follow (only 2.4):
- * 1. A user process on node A accesses a portion of a mapped file,
- * resulting in a page fault. The pagefault handler invokes the
- * ll_nopage function, which reads the page into memory.
- * 2. A user process on node B writes to the same portion of the file
- * (either via mmap or write()), that cause node A to cancel the
- * lock and truncate the page.
- * 3. Node A then executes the rest of do_no_page(), entering the
- * now-invalid page into the PTEs.
+/**
+ * Page fault handler.
*
- * Make the whole do_no_page as a hook to cover both the page cache
- * and page mapping installing with dlm lock would eliminate this race.
+ * \param vma - is virtiual area struct related to page fault
+ * \param address - address when hit fault
+ * \param type - of fault
*
- * In 2.6, the truncate_count of address_space can cover this race.
+ * \return allocated and filled page for address
+ * \retval NOPAGE_SIGBUS if page not exist on this address
+ * \retval NOPAGE_OOM not have memory for allocate new page
*/
struct page *ll_nopage(struct vm_area_struct *vma, unsigned long address,
int *type)
vma->vm_flags |= VM_RAND_READ;
page = filemap_nopage(vma, address, type);
- LL_CDEBUG_PAGE(D_PAGE, page, "got addr %lu type %lx\n", address,
- (long)type);
+ if (page != NOPAGE_SIGBUS && page != NOPAGE_OOM)
+ LL_CDEBUG_PAGE(D_PAGE, page, "got addr %lu type %lx\n", address,
+ (long)type);
+ else
+ CDEBUG(D_PAGE, "got addr %lu type %lx - SIGBUS\n", address,
+ (long)type);
+
vma->vm_flags &= ~VM_RAND_READ;
vma->vm_flags |= (rand_read | seq_read);