-/*
+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
+ *
* linux/fs/ext2_obd/ext2_obd.c
*
* Copyright (C) 2001 Cluster File Systems, Inc.
extern struct obd_device obd_dev[MAX_OBD_DEVICES];
static struct obdo OA;
static obd_count GEN;
+static long echo_pages = 0;
+
+static int echo_connect(struct lustre_handle *conn, struct obd_device *obd)
+{
+ int rc;
+
+ MOD_INC_USE_COUNT;
+ rc = class_connect(conn, obd);
-static int echo_getattr(struct obd_conn *conn, struct obdo *oa)
+ if (rc)
+ MOD_DEC_USE_COUNT;
+
+ return rc;
+}
+
+static int echo_disconnect(struct lustre_handle *conn)
+{
+ int rc;
+
+ rc = class_disconnect(conn);
+ if (!rc)
+ MOD_DEC_USE_COUNT;
+
+ return rc;
+}
+
+static int echo_getattr(struct lustre_handle *conn, struct obdo *oa)
{
memcpy(oa, &OA, sizeof(*oa));
oa->o_mode = ++GEN;
return 0;
}
-/*
-static int echo_setattr(struct obd_conn *conn, struct obdo *oa)
+int echo_preprw(int cmd, struct lustre_handle *conn, int objcount,
+ struct obd_ioobj *obj, int niocount, struct niobuf_remote *nb,
+ struct niobuf_local *res, void **desc_private)
{
- memcpy(&OA, oa, sizeof(*oa));
+ struct niobuf_local *r = res;
+ int rc = 0;
+ int i;
+
+ ENTRY;
+
+ memset(res, 0, sizeof(*res) * niocount);
+
+ CDEBUG(D_PAGE, "%s %d obdos with %d IOs\n",
+ cmd == OBD_BRW_READ ? "reading" : "writing", objcount, niocount);
+
+ for (i = 0; i < objcount; i++, obj++) {
+ int j;
+
+ for (j = 0 ; j < obj->ioo_bufcnt ; j++, nb++, r++) {
+ unsigned long address;
+
+ address = get_zeroed_page(GFP_KERNEL);
+ if (!address) {
+ CERROR("can't get new page %d/%d for id %Ld\n",
+ j, obj->ioo_bufcnt,
+ (unsigned long long)obj->ioo_id);
+ GOTO(preprw_cleanup, rc = -ENOMEM);
+ }
+ echo_pages++;
+
+ r->offset = nb->offset;
+ r->page = virt_to_page(address);
+ r->addr = kmap(r->page);
+ r->len = nb->len;
+ }
+ }
+ CDEBUG(D_PAGE, "%ld pages allocated after prep\n", echo_pages);
+
+ RETURN(0);
+
+preprw_cleanup:
+ /* It is possible that we would rather handle errors by allow
+ * any already-set-up pages to complete, rather than tearing them
+ * all down again. I believe that this is what the in-kernel
+ * prep/commit operations do.
+ */
+ CERROR("cleaning up %ld pages (%d obdos)\n", (long)(r - res), objcount);
+ while (r-- > res) {
+ kunmap(r->page);
+ __free_pages(r->page, 0);
+ echo_pages--;
+ }
+ memset(res, 0, sizeof(*res) * niocount);
+
+ return rc;
+}
- return 0;
+int echo_commitrw(int cmd, struct lustre_handle *conn, int objcount,
+ struct obd_ioobj *obj, int niocount, struct niobuf_local *res,
+ void *desc_private)
+{
+ struct niobuf_local *r = res;
+ int rc = 0;
+ int i;
+ ENTRY;
+
+ CDEBUG(D_PAGE, "%s %d obdos with %d IOs\n",
+ cmd == OBD_BRW_READ ? "reading" : "writing", objcount, niocount);
+
+ if (niocount && !r) {
+ CERROR("NULL res niobuf with niocount %d\n", niocount);
+ RETURN(-EINVAL);
+ }
+
+ for (i = 0; i < objcount; i++, obj++) {
+ int j;
+
+ for (j = 0 ; j < obj->ioo_bufcnt ; j++, r++) {
+ struct page *page = r->page;
+ unsigned long addr;
+
+ if (!page ||
+ !(addr = (unsigned long)page_address(page)) ||
+ !kern_addr_valid(addr)) {
+
+ CERROR("bad page %p, id %Ld (%d), buf %d/%d\n",
+ page, (unsigned long long)obj->ioo_id, i,
+ j, obj->ioo_bufcnt);
+ GOTO(commitrw_cleanup, rc = -EFAULT);
+ }
+
+ kunmap(page);
+ __free_pages(page, 0);
+ echo_pages--;
+ }
+ }
+ CDEBUG(D_PAGE, "%ld pages remain after commit\n", echo_pages);
+ RETURN(0);
+
+commitrw_cleanup:
+ CERROR("cleaning up %ld pages (%d obdos)\n",
+ niocount - (long)(r - res) - 1, objcount);
+ while (++r < res + niocount) {
+ struct page *page = r->page;
+
+ kunmap(page);
+ __free_pages(page, 0);
+ echo_pages--;
+ }
+ return rc;
}
-*/
struct obd_ops echo_obd_ops = {
- o_connect: gen_connect,
- o_disconnect: gen_disconnect,
+ o_connect: echo_connect,
+ o_disconnect: echo_disconnect,
o_getattr: echo_getattr,
-// o_setattr: echo_setattr,
+ o_preprw: echo_preprw,
+ o_commitrw: echo_commitrw,
};
{
printk(KERN_INFO "Echo OBD driver v0.001, braam@clusterfs.com\n");
- return obd_register_type(&echo_obd_ops, OBD_ECHO_DEVICENAME);
+ return class_register_type(&echo_obd_ops, OBD_ECHO_DEVICENAME);
}
static void __exit obdecho_exit(void)
{
- obd_unregister_type(OBD_ECHO_DEVICENAME);
+ CERROR("%ld prep/commitrw pages leaked\n", echo_pages);
+ class_unregister_type(OBD_ECHO_DEVICENAME);
}
-MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
+MODULE_AUTHOR("Cluster Filesystems Inc. <info@clusterfs.com>");
MODULE_DESCRIPTION("Lustre Testing Echo OBD driver v1.0");
MODULE_LICENSE("GPL");
git://git.whamcloud.com / fs / lustre-release.git / blobdiff