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 = NULL;
37 int obd_init_obdo_cache(void)
40 if (obdo_cachep != NULL) {
41 printk(KERN_INFO "obdo_cache already exists\n");
43 /* XXX maybe this shoul be an error return? */
47 obdo_cachep = kmem_cache_create("obdo_cache",
49 0, SLAB_HWCACHE_ALIGN,
51 if (obdo_cachep == NULL) {
59 void obd_cleanup_obdo_cache(void)
62 if (obdo_cachep != NULL)
63 kmem_cache_destroy(obdo_cachep);
70 /* map connection to client */
71 struct obd_client *gen_client(struct obd_conn *conn)
73 struct obd_device * obddev = conn->oc_dev;
74 struct list_head * lh, * next;
75 struct obd_client * cli;
77 lh = next = &obddev->obd_gen_clients;
78 while ((lh = lh->next) != &obddev->obd_gen_clients) {
79 cli = list_entry(lh, struct obd_client, cli_chain);
81 if (cli->cli_id == conn->oc_id)
90 /* a connection defines a context in which preallocation can be managed. */
91 int gen_connect (struct obd_conn *conn)
93 struct obd_client * cli;
95 OBD_ALLOC(cli, struct obd_client *, sizeof(struct obd_client));
97 printk("obd_connect (minor %d): no memory!\n",
98 conn->oc_dev->obd_minor);
102 INIT_LIST_HEAD(&cli->cli_prealloc_inodes);
103 /* this should probably spinlocked? */
104 cli->cli_id = ++conn->oc_dev->obd_gen_last_id;
105 cli->cli_prealloc_quota = 0;
106 cli->cli_obd = conn->oc_dev;
107 list_add(&(cli->cli_chain), conn->oc_dev->obd_gen_clients.prev);
109 CDEBUG(D_IOCTL, "connect: new ID %u\n", cli->cli_id);
110 conn->oc_id = cli->cli_id;
112 } /* gen_obd_connect */
115 int gen_disconnect(struct obd_conn *conn)
117 struct obd_client * cli;
120 if (!(cli = gen_client(conn))) {
121 CDEBUG(D_IOCTL, "disconnect: attempting to free "
122 "nonexistent client %u\n", conn->oc_id);
127 list_del(&(cli->cli_chain));
128 OBD_FREE(cli, sizeof(struct obd_client));
130 CDEBUG(D_IOCTL, "disconnect: ID %u\n", conn->oc_id);
134 } /* gen_obd_disconnect */
138 * raid1 defines a number of connections to child devices,
139 * used to make calls to these devices.
142 int gen_multi_setup(struct obd_device *obddev, uint32_t len, void *data)
146 for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
148 struct obd_conn *ch_conn = &obddev->obd_multi_conn[i];
149 rc = OBP(ch_conn->oc_dev, connect)(ch_conn);
152 /* XXX disconnect others */
161 int gen_multi_attach(struct obd_device *obddev, int len, void *data)
165 struct obd_device *rdev = obddev->obd_multi_dev[0];
167 count = len/sizeof(int);
168 obddev->obd_multi_count = count;
169 for (i=0 ; i<count ; i++) {
170 rdev = &obd_dev[*((int *)data + i)];
172 CDEBUG(D_IOCTL, "OBD RAID1: replicator %d is of type %s\n", i,
173 (rdev + i)->obd_type->typ_name);
181 * remove all connections to this device
182 * close all connections to lower devices
183 * needed for forced unloads of OBD client drivers
185 int gen_multi_cleanup(struct obd_device *obddev)
189 for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
190 struct obd_conn *ch_conn = &obddev->obd_multi_conn[i];
192 rc = OBP(ch_conn->oc_dev, disconnect)(ch_conn);
195 printk("OBD multi cleanup dev: disconnect failure %d\n", ch_conn->oc_dev->obd_minor);
199 } /* gen_multi_cleanup_device */
203 * forced cleanup of the device:
204 * - remove connections from the device
205 * - cleanup the device afterwards
207 int gen_cleanup(struct obd_device * obddev)
209 struct list_head * lh, * tmp;
210 struct obd_client * cli;
214 lh = tmp = &obddev->obd_gen_clients;
215 while ((tmp = tmp->next) != lh) {
216 cli = list_entry(tmp, struct obd_client, cli_chain);
217 CDEBUG(D_IOCTL, "Disconnecting obd_connection %d, at %p\n",
221 } /* sim_cleanup_device */
223 void ___wait_on_page(struct page *page)
225 struct task_struct *tsk = current;
226 DECLARE_WAITQUEUE(wait, tsk);
228 add_wait_queue(&page->wait, &wait);
230 run_task_queue(&tq_disk);
231 set_task_state(tsk, TASK_UNINTERRUPTIBLE);
232 if (!PageLocked(page))
235 } while (PageLocked(page));
236 tsk->state = TASK_RUNNING;
237 remove_wait_queue(&page->wait, &wait);
240 void lck_page(struct page *page)
242 while (TryLockPage(page))
243 ___wait_on_page(page);
246 /* XXX this should return errors correctly, so should migrate!!! */
247 int gen_copy_data(struct obd_conn *dst_conn, struct obdo *dst,
248 struct obd_conn *src_conn, struct obdo *src,
249 obd_size count, obd_off offset)
252 unsigned long index = 0;
256 CDEBUG(D_INODE, "src: ino %Ld blocks %Ld, size %Ld, dst: ino %Ld\n",
257 src->o_id, src->o_blocks, src->o_size, dst->o_id);
258 page = alloc_page(GFP_USER);
266 while (index < ((src->o_size + PAGE_SIZE - 1) >> PAGE_SHIFT)) {
269 rc = OBP(src_conn->oc_dev, brw)
270 (READ, src_conn, src, (char *)page_address(page),
271 PAGE_SIZE, (page->index) << PAGE_SHIFT, 0);
273 if ( rc != PAGE_SIZE )
275 CDEBUG(D_INODE, "Read page %ld ...\n", page->index);
277 rc = OBP(dst_conn->oc_dev, brw)
278 (WRITE, dst_conn, dst, (char *)page_address(page),
279 PAGE_SIZE, (page->index) << PAGE_SHIFT, 1);
280 if ( rc != PAGE_SIZE)
283 CDEBUG(D_INODE, "Wrote page %ld ...\n", page->index);
287 dst->o_size = src->o_size;
288 dst->o_blocks = src->o_blocks;