2 * linux/fs/ext2_obd/sim_obd.c
4 * These are the only exported functions; they provide the simulated object-
9 #include <linux/config.h>
10 #include <linux/kernel.h>
12 #include <linux/string.h>
13 #include <linux/stat.h>
14 #include <linux/errno.h>
15 #include <linux/locks.h>
16 #include <linux/unistd.h>
18 #include <asm/system.h>
19 #include <asm/uaccess.h>
22 #include <linux/stat.h>
23 #include <asm/uaccess.h>
24 #include <linux/vmalloc.h>
25 #include <asm/segment.h>
27 #include <linux/pagemap.h>
28 #include <linux/smp_lock.h>
30 #include <linux/obd_support.h>
31 #include <linux/obd_class.h>
34 extern struct obd_device obd_dev[MAX_OBD_DEVICES];
35 kmem_cache_t *obdo_cachep;
37 int obd_init_obdo_cache(void)
39 /* XXX need to free this somewhere? */
41 obdo_cachep = kmem_cache_create("obdo_cache",
43 0, SLAB_HWCACHE_ALIGN,
45 if (obdo_cachep == NULL) {
54 /* map connection to client */
55 struct obd_client *gen_client(struct obd_conn *conn)
57 struct obd_device * obddev = conn->oc_dev;
58 struct list_head * lh, * next;
59 struct obd_client * cli;
61 lh = next = &obddev->obd_gen_clients;
62 while ((lh = lh->next) != &obddev->obd_gen_clients) {
63 cli = list_entry(lh, struct obd_client, cli_chain);
65 if (cli->cli_id == conn->oc_id)
74 /* a connection defines a context in which preallocation can be managed. */
75 int gen_connect (struct obd_conn *conn)
77 struct obd_client * cli;
79 OBD_ALLOC(cli, struct obd_client *, sizeof(struct obd_client));
81 printk("obd_connect (minor %d): no memory!\n",
82 conn->oc_dev->obd_minor);
86 INIT_LIST_HEAD(&cli->cli_prealloc_inodes);
87 /* this should probably spinlocked? */
88 cli->cli_id = ++conn->oc_dev->obd_gen_last_id;
89 cli->cli_prealloc_quota = 0;
90 cli->cli_obd = conn->oc_dev;
91 list_add(&(cli->cli_chain), conn->oc_dev->obd_gen_clients.prev);
93 CDEBUG(D_IOCTL, "connect: new ID %u\n", cli->cli_id);
94 conn->oc_id = cli->cli_id;
96 } /* gen_obd_connect */
99 int gen_disconnect(struct obd_conn *conn)
101 struct obd_client * cli;
104 if (!(cli = gen_client(conn))) {
105 CDEBUG(D_IOCTL, "disconnect: attempting to free "
106 "nonexistent client %u\n", conn->oc_id);
111 list_del(&(cli->cli_chain));
112 OBD_FREE(cli, sizeof(struct obd_client));
114 CDEBUG(D_IOCTL, "disconnect: ID %u\n", conn->oc_id);
118 } /* gen_obd_disconnect */
122 * raid1 defines a number of connections to child devices,
123 * used to make calls to these devices.
126 int gen_multi_setup(struct obd_device *obddev, uint32_t len, void *data)
130 for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
132 struct obd_conn *ch_conn = &obddev->obd_multi_conn[i];
133 rc = OBP(ch_conn->oc_dev, connect)(ch_conn);
136 /* XXX disconnect others */
145 int gen_multi_attach(struct obd_device *obddev, int len, void *data)
149 struct obd_device *rdev = obddev->obd_multi_dev[0];
151 count = len/sizeof(int);
152 obddev->obd_multi_count = count;
153 for (i=0 ; i<count ; i++) {
154 rdev = &obd_dev[*((int *)data + i)];
156 CDEBUG(D_IOCTL, "OBD RAID1: replicator %d is of type %s\n", i,
157 (rdev + i)->obd_type->typ_name);
165 * remove all connections to this device
166 * close all connections to lower devices
167 * needed for forced unloads of OBD client drivers
169 int gen_multi_cleanup(struct obd_device *obddev)
173 for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
174 struct obd_conn *ch_conn = &obddev->obd_multi_conn[i];
176 rc = OBP(ch_conn->oc_dev, disconnect)(ch_conn);
179 printk("OBD multi cleanup dev: disconnect failure %d\n", ch_conn->oc_dev->obd_minor);
183 } /* gen_multi_cleanup_device */
187 * forced cleanup of the device:
188 * - remove connections from the device
189 * - cleanup the device afterwards
191 int gen_cleanup(struct obd_device * obddev)
193 struct list_head * lh, * tmp;
194 struct obd_client * cli;
198 lh = tmp = &obddev->obd_gen_clients;
199 while ((tmp = tmp->next) != lh) {
200 cli = list_entry(tmp, struct obd_client, cli_chain);
201 CDEBUG(D_IOCTL, "Disconnecting obd_connection %d, at %p\n",
205 } /* sim_cleanup_device */
207 void ___wait_on_page(struct page *page)
209 struct task_struct *tsk = current;
210 DECLARE_WAITQUEUE(wait, tsk);
212 add_wait_queue(&page->wait, &wait);
214 run_task_queue(&tq_disk);
215 set_task_state(tsk, TASK_UNINTERRUPTIBLE);
216 if (!PageLocked(page))
219 } while (PageLocked(page));
220 tsk->state = TASK_RUNNING;
221 remove_wait_queue(&page->wait, &wait);
224 void lck_page(struct page *page)
226 while (TryLockPage(page))
227 ___wait_on_page(page);
230 /* XXX this should return errors correctly, so should migrate!!! */
231 int gen_copy_data(struct obd_conn *dst_conn, struct obdo *dst,
232 struct obd_conn *src_conn, struct obdo *src,
233 obd_size count, obd_off offset)
236 unsigned long index = 0;
240 CDEBUG(D_INODE, "src: ino %Ld blocks %Ld, size %Ld, dst: ino %Ld\n",
241 src->o_id, src->o_blocks, src->o_size, dst->o_id);
242 page = alloc_page(GFP_USER);
250 while (index < ((src->o_size + PAGE_SIZE - 1) >> PAGE_SHIFT)) {
253 rc = OBP(src_conn->oc_dev, brw)
254 (READ, src_conn, src, (char *)page_address(page),
255 PAGE_SIZE, (page->index) << PAGE_SHIFT, 0);
257 if ( rc != PAGE_SIZE )
259 CDEBUG(D_INODE, "Read page %ld ...\n", page->index);
261 rc = OBP(dst_conn->oc_dev, brw)
262 (WRITE, dst_conn, dst, (char *)page_address(page),
263 PAGE_SIZE, (page->index) << PAGE_SHIFT, 1);
264 if ( rc != PAGE_SIZE)
267 CDEBUG(D_INODE, "Wrote page %ld ...\n", page->index);
271 dst->o_size = src->o_size;
272 dst->o_blocks = src->o_blocks;