1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * linux/fs/ext2_obd/ext2_obd.c
6 * Copyright (C) 2001 Cluster File Systems, Inc.
8 * This code is issued under the GNU General Public License.
9 * See the file COPYING in this distribution
11 * by Peter Braam <braam@clusterfs.com>
14 static char rcsid[] __attribute ((unused)) = "$Id: echo.c,v 1.21 2002/08/12 21:57:42 pschwan Exp $";
15 #define OBDECHO_VERSION "$Revision: 1.21 $"
19 #include <linux/version.h>
20 #include <linux/module.h>
22 #include <linux/stat.h>
23 #include <linux/locks.h>
24 #include <linux/ext2_fs.h>
25 #include <linux/quotaops.h>
26 #include <linux/proc_fs.h>
27 #include <linux/init.h>
28 #include <asm/unistd.h>
30 #define DEBUG_SUBSYSTEM S_ECHO
32 #include <linux/obd_support.h>
33 #include <linux/obd_class.h>
34 #include <linux/obd_echo.h>
35 #include <linux/lustre_dlm.h>
37 extern struct obd_device obd_dev[MAX_OBD_DEVICES];
38 static struct obdo OA;
40 static long echo_pages = 0;
42 static atomic_t echo_page_rws;
43 static atomic_t echo_getattrs;
45 #define ECHO_PROC_STAT "sys/obdecho"
48 echo_proc_read (char *page, char **start, off_t off, int count, int *eof, void *data)
51 int attrs = atomic_read (&echo_getattrs);
52 int pages = atomic_read (&echo_page_rws);
58 len = sprintf (page, "%d %d\n", pages, attrs);
65 echo_proc_write (struct file *file, const char *ubuffer, unsigned long count, void *data)
67 /* Ignore what we've been asked to write, and just zero the stats counters */
68 atomic_set (&echo_page_rws, 0);
69 atomic_set (&echo_getattrs, 0);
77 struct proc_dir_entry *entry = create_proc_entry (ECHO_PROC_STAT, S_IFREG | S_IRUGO | S_IWUSR, NULL);
81 CERROR("couldn't create proc entry %s\n", ECHO_PROC_STAT);
86 entry->read_proc = echo_proc_read;
87 entry->write_proc = echo_proc_write;
93 remove_proc_entry(ECHO_PROC_STAT, 0);
96 static int echo_connect(struct lustre_handle *conn, struct obd_device *obd,
102 rc = class_connect(conn, obd, NULL);
110 static int echo_disconnect(struct lustre_handle *conn)
114 rc = class_disconnect(conn);
121 static int echo_getattr(struct lustre_handle *conn, struct obdo *oa,
122 struct lov_stripe_md *md)
124 memcpy(oa, &OA, sizeof(*oa));
127 atomic_inc (&echo_getattrs);
132 int echo_preprw(int cmd, struct lustre_handle *conn, int objcount,
133 struct obd_ioobj *obj, int niocount, struct niobuf_remote *nb,
134 struct niobuf_local *res, void **desc_private)
136 struct niobuf_local *r = res;
142 memset(res, 0, sizeof(*res) * niocount);
144 CDEBUG(D_PAGE, "%s %d obdos with %d IOs\n",
145 cmd == OBD_BRW_READ ? "reading" : "writing", objcount, niocount);
147 for (i = 0; i < objcount; i++, obj++) {
150 for (j = 0 ; j < obj->ioo_bufcnt ; j++, nb++, r++) {
151 unsigned long address;
153 address = get_zeroed_page(GFP_KERNEL);
155 CERROR("can't get new page %d/%d for id %Ld\n",
157 (unsigned long long)obj->ioo_id);
158 GOTO(preprw_cleanup, rc = -ENOMEM);
162 r->offset = nb->offset;
163 r->page = virt_to_page(address);
164 r->addr = kmap(r->page);
168 CDEBUG(D_PAGE, "%ld pages allocated after prep\n", echo_pages);
173 /* It is possible that we would rather handle errors by allow
174 * any already-set-up pages to complete, rather than tearing them
175 * all down again. I believe that this is what the in-kernel
176 * prep/commit operations do.
178 CERROR("cleaning up %ld pages (%d obdos)\n", (long)(r - res), objcount);
181 __free_pages(r->page, 0);
184 memset(res, 0, sizeof(*res) * niocount);
189 int echo_commitrw(int cmd, struct lustre_handle *conn, int objcount,
190 struct obd_ioobj *obj, int niocount, struct niobuf_local *res,
193 struct niobuf_local *r = res;
198 CDEBUG(D_PAGE, "%s %d obdos with %d IOs\n",
199 cmd == OBD_BRW_READ ? "reading" : "writing", objcount, niocount);
201 if (niocount && !r) {
202 CERROR("NULL res niobuf with niocount %d\n", niocount);
206 for (i = 0; i < objcount; i++, obj++) {
209 for (j = 0 ; j < obj->ioo_bufcnt ; j++, r++) {
210 struct page *page = r->page;
214 !(addr = (unsigned long)page_address(page)) ||
215 !kern_addr_valid(addr)) {
217 CERROR("bad page %p, id %Ld (%d), buf %d/%d\n",
218 page, (unsigned long long)obj->ioo_id, i,
220 GOTO(commitrw_cleanup, rc = -EFAULT);
223 atomic_inc (&echo_page_rws);
226 __free_pages(page, 0);
230 CDEBUG(D_PAGE, "%ld pages remain after commit\n", echo_pages);
234 CERROR("cleaning up %ld pages (%d obdos)\n",
235 niocount - (long)(r - res) - 1, objcount);
236 while (++r < res + niocount) {
237 struct page *page = r->page;
240 __free_pages(page, 0);
246 static int echo_setup(struct obd_device *obddev, obd_count len, void *buf)
250 obddev->obd_namespace =
251 ldlm_namespace_new("echo-tgt", LDLM_NAMESPACE_SERVER);
252 if (obddev->obd_namespace == NULL)
259 struct obd_ops echo_obd_ops = {
260 o_connect: echo_connect,
261 o_disconnect: echo_disconnect,
262 o_getattr: echo_getattr,
263 o_preprw: echo_preprw,
264 o_commitrw: echo_commitrw,
268 static int __init obdecho_init(void)
270 printk(KERN_INFO "Echo OBD driver " OBDECHO_VERSION " info@clusterfs.com\n");
274 return class_register_type(&echo_obd_ops, OBD_ECHO_DEVICENAME);
277 static void __exit obdecho_exit(void)
281 CERROR("%ld prep/commitrw pages leaked\n", echo_pages);
282 class_unregister_type(OBD_ECHO_DEVICENAME);
285 MODULE_AUTHOR("Cluster Filesystems Inc. <info@clusterfs.com>");
286 MODULE_DESCRIPTION("Lustre Testing Echo OBD driver " OBDECHO_VERSION);
287 MODULE_LICENSE("GPL");
289 module_init(obdecho_init);
290 module_exit(obdecho_exit);