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", sizeof(struct obdo),
48 0, SLAB_HWCACHE_ALIGN, NULL, NULL);
49 if (obdo_cachep == NULL) {
57 void obd_cleanup_obdo_cache(void)
60 if (obdo_cachep != NULL)
61 kmem_cache_destroy(obdo_cachep);
68 /* map connection to client */
69 struct obd_client *gen_client(struct obd_conn *conn)
71 struct obd_device * obddev = conn->oc_dev;
72 struct list_head * lh, * next;
73 struct obd_client * cli;
75 lh = next = &obddev->obd_gen_clients;
76 while ((lh = lh->next) != &obddev->obd_gen_clients) {
77 cli = list_entry(lh, struct obd_client, cli_chain);
79 if (cli->cli_id == conn->oc_id)
87 /* a connection defines a context in which preallocation can be managed. */
88 int gen_connect (struct obd_conn *conn)
90 struct obd_client * cli;
92 OBD_ALLOC(cli, struct obd_client *, sizeof(struct obd_client));
94 printk("obd_connect (minor %d): no memory!\n",
95 conn->oc_dev->obd_minor);
99 INIT_LIST_HEAD(&cli->cli_prealloc_inodes);
100 /* XXX this should probably spinlocked? */
101 cli->cli_id = ++conn->oc_dev->obd_gen_last_id;
102 cli->cli_prealloc_quota = 0;
103 cli->cli_obd = conn->oc_dev;
104 list_add(&(cli->cli_chain), conn->oc_dev->obd_gen_clients.prev);
106 CDEBUG(D_IOCTL, "connect: new ID %u\n", cli->cli_id);
107 conn->oc_id = cli->cli_id;
109 } /* gen_obd_connect */
112 int gen_disconnect(struct obd_conn *conn)
114 struct obd_client * cli;
117 if (!(cli = gen_client(conn))) {
118 CDEBUG(D_IOCTL, "disconnect: attempting to free "
119 "nonexistent client %u\n", conn->oc_id);
124 list_del(&(cli->cli_chain));
125 OBD_FREE(cli, sizeof(struct obd_client));
127 CDEBUG(D_IOCTL, "disconnect: ID %u\n", conn->oc_id);
131 } /* gen_obd_disconnect */
135 * raid1 defines a number of connections to child devices,
136 * used to make calls to these devices.
139 int gen_multi_setup(struct obd_device *obddev, uint32_t len, void *data)
143 for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
145 struct obd_conn *ch_conn = &obddev->obd_multi_conn[i];
146 rc = OBP(ch_conn->oc_dev, connect)(ch_conn);
149 /* XXX disconnect others */
158 int gen_multi_attach(struct obd_device *obddev, int len, void *data)
162 struct obd_device *rdev = obddev->obd_multi_dev[0];
164 count = len/sizeof(int);
165 obddev->obd_multi_count = count;
166 for (i=0 ; i<count ; i++) {
167 rdev = &obd_dev[*((int *)data + i)];
169 CDEBUG(D_IOCTL, "OBD RAID1: replicator %d is of type %s\n", i,
170 (rdev + i)->obd_type->typ_name);
178 * remove all connections to this device
179 * close all connections to lower devices
180 * needed for forced unloads of OBD client drivers
182 int gen_multi_cleanup(struct obd_device *obddev)
186 for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
187 struct obd_conn *ch_conn = &obddev->obd_multi_conn[i];
189 rc = OBP(ch_conn->oc_dev, disconnect)(ch_conn);
192 printk("OBD multi cleanup dev: disconnect failure %d\n", ch_conn->oc_dev->obd_minor);
196 } /* gen_multi_cleanup_device */
200 * forced cleanup of the device:
201 * - remove connections from the device
202 * - cleanup the device afterwards
204 int gen_cleanup(struct obd_device * obddev)
206 struct list_head * lh, * tmp;
207 struct obd_client * cli;
211 lh = tmp = &obddev->obd_gen_clients;
212 while ((tmp = tmp->next) != lh) {
213 cli = list_entry(tmp, struct obd_client, cli_chain);
214 CDEBUG(D_IOCTL, "Disconnecting obd_connection %d, at %p\n",
218 } /* sim_cleanup_device */
220 void ___wait_on_page(struct page *page)
222 struct task_struct *tsk = current;
223 DECLARE_WAITQUEUE(wait, tsk);
225 add_wait_queue(&page->wait, &wait);
227 run_task_queue(&tq_disk);
228 set_task_state(tsk, TASK_UNINTERRUPTIBLE);
229 if (!PageLocked(page))
232 } while (PageLocked(page));
233 tsk->state = TASK_RUNNING;
234 remove_wait_queue(&page->wait, &wait);
237 void lck_page(struct page *page)
239 while (TryLockPage(page))
240 ___wait_on_page(page);
243 /* XXX this should return errors correctly, so should migrate!!! */
244 int gen_copy_data(struct obd_conn *dst_conn, struct obdo *dst,
245 struct obd_conn *src_conn, struct obdo *src,
246 obd_size count, obd_off offset)
249 unsigned long index = 0;
253 CDEBUG(D_INODE, "src: ino %Ld blocks %Ld, size %Ld, dst: ino %Ld\n",
254 src->o_id, src->o_blocks, src->o_size, dst->o_id);
255 page = alloc_page(GFP_USER);
263 while (index < ((src->o_size + PAGE_SIZE - 1) >> PAGE_SHIFT)) {
266 rc = OBP(src_conn->oc_dev, brw)
267 (READ, src_conn, src, (char *)page_address(page),
268 PAGE_SIZE, (page->index) << PAGE_SHIFT, 0);
270 if ( rc != PAGE_SIZE )
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 PAGE_SIZE, (page->index) << PAGE_SHIFT, 1);
277 if ( rc != PAGE_SIZE)
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);