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 obdo_cachep = kmem_cache_create("obdo_cache",
43 0, SLAB_HWCACHE_ALIGN,
45 if (obdo_cachep == NULL) {
54 void obd_cleanup_obdo_cache(void)
57 if (obdo_cachep != NULL) {
58 if (kmem_cache_shrink(obdo_cachep))
59 printk(KERN_INFO "obd_cleanup_obdo_cache: unable to free all of cache\n");
61 printk(KERN_INFO "obd_cleanup_obdo_cache: called with NULL cache pointer\n");
67 /* map connection to client */
68 struct obd_client *gen_client(struct obd_conn *conn)
70 struct obd_device * obddev = conn->oc_dev;
71 struct list_head * lh, * next;
72 struct obd_client * cli;
74 lh = next = &obddev->obd_gen_clients;
75 while ((lh = lh->next) != &obddev->obd_gen_clients) {
76 cli = list_entry(lh, struct obd_client, cli_chain);
78 if (cli->cli_id == conn->oc_id)
86 /* a connection defines a context in which preallocation can be managed. */
87 int gen_connect (struct obd_conn *conn)
89 struct obd_client * cli;
91 OBD_ALLOC(cli, struct obd_client *, sizeof(struct obd_client));
93 printk("obd_connect (minor %d): no memory!\n",
94 conn->oc_dev->obd_minor);
98 INIT_LIST_HEAD(&cli->cli_prealloc_inodes);
99 /* XXX this should probably spinlocked? */
100 cli->cli_id = ++conn->oc_dev->obd_gen_last_id;
101 cli->cli_prealloc_quota = 0;
102 cli->cli_obd = conn->oc_dev;
103 list_add(&(cli->cli_chain), conn->oc_dev->obd_gen_clients.prev);
105 CDEBUG(D_IOCTL, "connect: new ID %u\n", cli->cli_id);
106 conn->oc_id = cli->cli_id;
108 } /* gen_obd_connect */
111 int gen_disconnect(struct obd_conn *conn)
113 struct obd_client * cli;
116 if (!(cli = gen_client(conn))) {
117 CDEBUG(D_IOCTL, "disconnect: attempting to free "
118 "nonexistent client %u\n", conn->oc_id);
123 list_del(&(cli->cli_chain));
124 OBD_FREE(cli, sizeof(struct obd_client));
126 CDEBUG(D_IOCTL, "disconnect: ID %u\n", conn->oc_id);
130 } /* gen_obd_disconnect */
134 * raid1 defines a number of connections to child devices,
135 * used to make calls to these devices.
138 int gen_multi_setup(struct obd_device *obddev, uint32_t len, void *data)
142 for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
144 struct obd_conn *ch_conn = &obddev->obd_multi_conn[i];
145 rc = OBP(ch_conn->oc_dev, connect)(ch_conn);
148 /* XXX disconnect others */
157 int gen_multi_attach(struct obd_device *obddev, int len, void *data)
161 struct obd_device *rdev = obddev->obd_multi_dev[0];
163 count = len/sizeof(int);
164 obddev->obd_multi_count = count;
165 for (i=0 ; i<count ; i++) {
166 rdev = &obd_dev[*((int *)data + i)];
168 CDEBUG(D_IOCTL, "OBD RAID1: replicator %d is of type %s\n", i,
169 (rdev + i)->obd_type->typ_name);
177 * remove all connections to this device
178 * close all connections to lower devices
179 * needed for forced unloads of OBD client drivers
181 int gen_multi_cleanup(struct obd_device *obddev)
185 for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
186 struct obd_conn *ch_conn = &obddev->obd_multi_conn[i];
188 rc = OBP(ch_conn->oc_dev, disconnect)(ch_conn);
191 printk("OBD multi cleanup dev: disconnect failure %d\n", ch_conn->oc_dev->obd_minor);
195 } /* gen_multi_cleanup_device */
199 * forced cleanup of the device:
200 * - remove connections from the device
201 * - cleanup the device afterwards
203 int gen_cleanup(struct obd_device * obddev)
205 struct list_head * lh, * tmp;
206 struct obd_client * cli;
210 lh = tmp = &obddev->obd_gen_clients;
211 while ((tmp = tmp->next) != lh) {
212 cli = list_entry(tmp, struct obd_client, cli_chain);
213 CDEBUG(D_IOCTL, "Disconnecting obd_connection %d, at %p\n",
217 } /* sim_cleanup_device */
219 void ___wait_on_page(struct page *page)
221 struct task_struct *tsk = current;
222 DECLARE_WAITQUEUE(wait, tsk);
224 add_wait_queue(&page->wait, &wait);
226 run_task_queue(&tq_disk);
227 set_task_state(tsk, TASK_UNINTERRUPTIBLE);
228 if (!PageLocked(page))
231 } while (PageLocked(page));
232 tsk->state = TASK_RUNNING;
233 remove_wait_queue(&page->wait, &wait);
236 void lck_page(struct page *page)
238 while (TryLockPage(page))
239 ___wait_on_page(page);
242 /* XXX this should return errors correctly, so should migrate!!! */
243 int gen_copy_data(struct obd_conn *dst_conn, struct obdo *dst,
244 struct obd_conn *src_conn, struct obdo *src,
245 obd_size count, obd_off offset)
248 unsigned long index = 0;
252 CDEBUG(D_INODE, "src: ino %Ld blocks %Ld, size %Ld, dst: ino %Ld\n",
253 src->o_id, src->o_blocks, src->o_size, dst->o_id);
254 page = alloc_page(GFP_USER);
262 while (index < ((src->o_size + PAGE_SIZE - 1) >> PAGE_SHIFT)) {
263 obd_size count = PAGE_SIZE;
266 rc = OBP(src_conn->oc_dev, brw)
267 (READ, src_conn, src, (char *)page_address(page),
268 &count, (page->index) << PAGE_SHIFT, 0);
272 CDEBUG(D_INODE, "Read page %ld ...\n", page->index);
274 rc = OBP(dst_conn->oc_dev, brw)
275 (WRITE, dst_conn, dst, (char *)page_address(page),
276 &count, (page->index) << PAGE_SHIFT, 1);
280 CDEBUG(D_INODE, "Wrote page %ld ...\n", page->index);
284 dst->o_size = src->o_size;
285 dst->o_blocks = src->o_blocks;
286 dst->o_valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS);