static struct vvp_io *cl2vvp_io(const struct lu_env *env,
const struct cl_io_slice *slice);
+/**
+ * True, if \a io is a normal io, False for sendfile() / splice_{read|write}
+ */
+int cl_is_normalio(const struct lu_env *env, const struct cl_io *io)
+{
+ struct vvp_io *vio = vvp_env_io(env);
+
+ LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
+
+ return vio->cui_io_subtype == IO_NORMAL;
+}
+
/*****************************************************************************
*
* io operations.
LASSERT(io->ci_type == CIT_READ || io->ci_type == CIT_WRITE);
- if (cl_io_is_sendfile(io))
+ if (!cl_is_normalio(env, io))
RETURN(0);
for (seg = 0; seg < vio->cui_nrsegs; seg++) {
/* BUG: 5972 */
file_accessed(file);
- if (cl_io_is_sendfile(io)) {
+ switch (vio->cui_io_subtype) {
+ case IO_NORMAL:
+ result = lustre_generic_file_read(file, cio, &pos);
+ break;
+#ifdef HAVE_KERNEL_SENDFILE
+ case IO_SENDFILE:
result = generic_file_sendfile(file, &pos, cnt,
- vio->u.read.cui_actor, vio->u.read.cui_target);
- } else {
- result = lustre_generic_file_read(file, cio, &pos);
+ vio->u.sendfile.cui_actor,
+ vio->u.sendfile.cui_target);
+ break;
+#endif
+#ifdef HAVE_KERNEL_SPLICE_READ
+ case IO_SPLICE:
+ result = generic_file_splice_read(file, &pos,
+ vio->u.splice.cui_pipe, cnt,
+ vio->u.splice.cui_flags);
+ break;
+#endif
+ default:
+ CERROR("Wrong IO type %u\n", vio->cui_io_subtype);
+ LBUG();
}
out:
RETURN(result);
}
+#ifndef HAVE_VM_OP_FAULT
+static int vvp_io_kernel_fault(struct vvp_fault_io *cfio)
+{
+ cfs_page_t *vmpage;
+
+ vmpage = filemap_nopage(cfio->ft_vma, cfio->nopage.ft_address,
+ cfio->nopage.ft_type);
+
+ if (vmpage == NOPAGE_SIGBUS) {
+ CDEBUG(D_PAGE, "got addr %lu type %lx - SIGBUS\n",
+ cfio->nopage.ft_address,(long)cfio->nopage.ft_type);
+ return -EFAULT;
+ } else if (vmpage == NOPAGE_OOM) {
+ CDEBUG(D_PAGE, "got addr %lu type %lx - OOM\n",
+ cfio->nopage.ft_address, (long)cfio->nopage.ft_type);
+ return -ENOMEM;
+ }
+
+ LL_CDEBUG_PAGE(D_PAGE, vmpage, "got addr %lu type %lx\n",
+ cfio->nopage.ft_address, (long)cfio->nopage.ft_type);
+
+ cfio->ft_vmpage = vmpage;
+
+ return 0;
+}
+#else
+static int vvp_io_kernel_fault(struct vvp_fault_io *cfio)
+{
+ cfio->fault.ft_flags = filemap_fault(cfio->ft_vma, cfio->fault.ft_vmf);
+
+ if (cfio->fault.ft_vmf->page) {
+ LL_CDEBUG_PAGE(D_PAGE, cfio->fault.ft_vmf->page,
+ "got addr %p type NOPAGE\n",
+ cfio->fault.ft_vmf->virtual_address);
+ /*XXX workaround to bug in CLIO - he deadlocked with
+ lock cancel if page locked */
+ if (likely(cfio->fault.ft_flags & VM_FAULT_LOCKED)) {
+ unlock_page(cfio->fault.ft_vmf->page);
+ cfio->fault.ft_flags &= ~VM_FAULT_LOCKED;
+ }
+
+ cfio->ft_vmpage = cfio->fault.ft_vmf->page;
+ return 0;
+ }
+
+ if (unlikely (cfio->fault.ft_flags & VM_FAULT_ERROR)) {
+ CDEBUG(D_PAGE, "got addr %p - SIGBUS\n",
+ cfio->fault.ft_vmf->virtual_address);
+ return -EFAULT;
+ }
+
+ if (unlikely (cfio->fault.ft_flags & VM_FAULT_NOPAGE)) {
+ CDEBUG(D_PAGE, "got addr %p - OOM\n",
+ cfio->fault.ft_vmf->virtual_address);
+ return -ENOMEM;
+ }
+
+ CERROR("unknow error in page fault!\n");
+ return -EINVAL;
+}
+
+#endif
+
static int vvp_io_fault_start(const struct lu_env *env,
const struct cl_io_slice *ios)
{
struct inode *inode = ccc_object_inode(obj);
struct cl_fault_io *fio = &io->u.ci_fault;
struct vvp_fault_io *cfio = &vio->u.fault;
- cfs_page_t *vmpage;
loff_t offset;
+ int kernel_result = 0;
int result = 0;
+ struct cl_page *page;
+ loff_t size;
+ pgoff_t last; /* last page in a file data region */
LASSERT(vio->cui_oneshot == 0);
if (result != 0)
return result;
- vmpage = filemap_nopage(cfio->ft_vma, cfio->ft_address, cfio->ft_type);
- if (vmpage != NOPAGE_SIGBUS && vmpage != NOPAGE_OOM)
- LL_CDEBUG_PAGE(D_PAGE, vmpage,
- "got addr %lu type %lx\n",
- cfio->ft_address, (long)cfio->ft_type);
- else
- CDEBUG(D_PAGE, "got addr %lu type %lx - SIGBUS\n",
- cfio->ft_address, (long)cfio->ft_type);
-
- if (vmpage == NOPAGE_SIGBUS)
- result = -EFAULT;
- else if (vmpage == NOPAGE_OOM)
- result = -ENOMEM;
- else {
- struct cl_page *page;
- loff_t size;
- pgoff_t last; /* last page in a file data region */
-
- /* Temporarily lock vmpage to keep cl_page_find() happy. */
- lock_page(vmpage);
- page = cl_page_find(env, obj, fio->ft_index, vmpage,
- CPT_CACHEABLE);
- unlock_page(vmpage);
- if (!IS_ERR(page)) {
- size = i_size_read(inode);
- last = cl_index(obj, size - 1);
- if (fio->ft_index == last)
- /*
- * Last page is mapped partially.
- */
- fio->ft_nob = size - cl_offset(obj,
- fio->ft_index);
- else
- fio->ft_nob = cl_page_size(obj);
- lu_ref_add(&page->cp_reference, "fault", io);
- fio->ft_page = page;
- /*
- * Certain 2.6 kernels return not-NULL from
- * filemap_nopage() when page is beyond the file size,
- * on the grounds that "An external ptracer can access
- * pages that normally aren't accessible.." Don't
- * propagate such page fault to the lower layers to
- * avoid side-effects like KMS updates.
- */
- if (fio->ft_index > last)
- result = +1;
- } else
- result = PTR_ERR(page);
+ /* must return locked page */
+ kernel_result = vvp_io_kernel_fault(cfio);
+ if (kernel_result != 0)
+ return kernel_result;
+ /* Temporarily lock vmpage to keep cl_page_find() happy. */
+ lock_page(cfio->ft_vmpage);
+ page = cl_page_find(env, obj, fio->ft_index, cfio->ft_vmpage,
+ CPT_CACHEABLE);
+ unlock_page(cfio->ft_vmpage);
+ if (IS_ERR(page)) {
+ page_cache_release(cfio->ft_vmpage);
+ cfio->ft_vmpage = NULL;
+ return PTR_ERR(page);
}
+
+ size = i_size_read(inode);
+ last = cl_index(obj, size - 1);
+ if (fio->ft_index == last)
+ /*
+ * Last page is mapped partially.
+ */
+ fio->ft_nob = size - cl_offset(obj, fio->ft_index);
+ else
+ fio->ft_nob = cl_page_size(obj);
+
+ lu_ref_add(&page->cp_reference, "fault", io);
+ fio->ft_page = page;
+ /*
+ * Certain 2.6 kernels return not-NULL from
+ * filemap_nopage() when page is beyond the file size,
+ * on the grounds that "An external ptracer can access
+ * pages that normally aren't accessible.." Don't
+ * propagate such page fault to the lower layers to
+ * avoid side-effects like KMS updates.
+ */
+ if (fio->ft_index > last)
+ result = +1;
+
return result;
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff