2 * An implementation of a loadable kernel mode driver providing
3 * multiple kernel/user space bidirectional communications links.
5 * Author: Alan Cox <alan@cymru.net>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
12 * Adapted to become the Linux 2.0 Coda pseudo device
13 * Peter Braam <braam@maths.ox.ac.uk>
14 * Michael Callahan <mjc@emmy.smith.edu>
16 * Changes for Linux 2.1
17 * Copyright (c) 1997 Carnegie-Mellon University
19 * Redone again for Intermezzo
20 * Copyright (c) 1998 Peter J. Braam
22 * Hacked up again for simulated OBD
23 * Copyright (c) 1999 Stelias Computing, Inc.
24 * (authors {pschwan,braam}@stelias.com)
25 * Copyright (C) 1999 Seagate Technology, Inc.
32 #include <linux/config.h> /* for CONFIG_PROC_FS */
33 #include <linux/module.h>
34 #include <linux/errno.h>
35 #include <linux/kernel.h>
36 #include <linux/major.h>
37 #include <linux/sched.h>
39 #include <linux/malloc.h>
40 #include <linux/ioport.h>
41 #include <linux/fcntl.h>
42 #include <linux/delay.h>
43 #include <linux/skbuff.h>
44 #include <linux/proc_fs.h>
45 #include <linux/vmalloc.h>
47 #include <linux/poll.h>
48 #include <linux/init.h>
49 #include <linux/list.h>
51 #include <asm/segment.h>
52 #include <asm/system.h>
54 #include <asm/uaccess.h>
56 #include <linux/obd_support.h>
57 #include <linux/obd_class.h>
59 static int obd_init_magic;
60 int obd_print_entry = 1;
61 int obd_debug_level = 4095;
62 struct obd_device obd_dev[MAX_OBD_DEVICES];
63 struct list_head obd_types;
65 /* called when opening /dev/obdNNN */
66 static int obd_class_open(struct inode * inode, struct file * file)
73 dev = MINOR(inode->i_rdev);
74 if (dev >= MAX_OBD_DEVICES)
76 obd_dev[dev].obd_refcnt++;
77 CDEBUG(D_PSDEV, "Refcount now %d\n", obd_dev[dev].obd_refcnt);
84 /* called when closing /dev/obdNNN */
85 static int obd_class_release(struct inode * inode, struct file * file)
92 dev = MINOR(inode->i_rdev);
93 if (dev >= MAX_OBD_DEVICES)
95 fsync_dev(inode->i_rdev);
96 if (obd_dev[dev].obd_refcnt <= 0)
97 printk(KERN_ALERT "presto_psdev_release: refcount(%d) <= 0\n",
98 obd_dev[dev].obd_refcnt);
99 obd_dev[dev].obd_refcnt--;
101 CDEBUG(D_PSDEV, "Refcount now %d\n", obd_dev[dev].obd_refcnt);
108 /* support function */
109 static struct obd_type *obd_nm_to_type(char *nm)
111 struct list_head *tmp;
112 struct obd_type *type;
113 CDEBUG(D_IOCTL, "SEARCH %s\n", nm);
116 while ( (tmp = tmp->next) != &obd_types ) {
117 type = list_entry(tmp, struct obd_type, typ_chain);
118 CDEBUG(D_IOCTL, "TYP %s\n", type->typ_name);
119 if (strlen(type->typ_name) == strlen(nm) &&
120 strcmp(type->typ_name, nm) == 0 ) {
128 static int getdata(int len, void **data)
135 CDEBUG(D_IOCTL, "getdata: len %d, add %p\n", len, *data);
137 OBD_ALLOC(tmp, void *, len);
142 if ( copy_from_user(tmp, *data, len)) {
151 /* to control /dev/obdNNN */
152 static int obd_class_ioctl (struct inode * inode, struct file * filp,
153 unsigned int cmd, unsigned long arg)
156 struct obd_device *obddev;
157 struct obd_conn conn;
158 long int cli_id; /* connect, disconnect */
163 dev = MINOR(inode->i_rdev);
164 if (dev > MAX_OBD_DEVICES)
166 obddev = &obd_dev[dev];
167 conn.oc_dev = obddev;
172 case OBD_IOC_ATTACH: {
173 struct obd_type *type;
174 struct oic_generic input;
176 /* have we attached a type to this device */
177 if ( obddev->obd_type || (obddev->obd_flags & OBD_ATTACHED) ){
178 CDEBUG(D_IOCTL, "OBD Device %d already attached to type %s.\n", dev, obddev->obd_type->typ_name);
182 /* get data structures */
183 err = copy_from_user(&input, (void *) arg, sizeof(input));
187 if ( (err = getdata(input.att_typelen + 1, &input.att_type)) )
192 type = obd_nm_to_type(input.att_type);
193 OBD_FREE(input.att_type, input.att_typelen + 1);
195 printk("Unknown obd type dev %d\n", dev);
198 obddev->obd_type = type;
200 /* get the attach data */
201 if ( (err = getdata(input.att_datalen, &input.att_data)) ) {
205 INIT_LIST_HEAD(&obddev->obd_gen_clients);
206 obddev->obd_multi_count = 0;
208 CDEBUG(D_IOCTL, "Attach %d, datalen %d, type %s\n",
209 dev, input.att_datalen, obddev->obd_type->typ_name);
210 if (!obddev->obd_type->typ_ops || !OBP(obddev,attach)) {
211 obddev->obd_flags |= OBD_ATTACHED;
218 err = OBP(obddev,attach)(obddev,
219 input.att_datalen, input.att_data);
220 OBD_FREE(input.att_data, input.att_datalen);
223 obddev->obd_flags &= ~OBD_ATTACHED;
224 obddev->obd_type = NULL;
226 obddev->obd_flags |= OBD_ATTACHED;
233 case OBD_IOC_DETACH: {
235 if (obddev->obd_flags & OBD_SET_UP)
237 if (! (obddev->obd_flags & OBD_ATTACHED) )
239 if ( !list_empty(&obddev->obd_gen_clients) )
242 obddev->obd_flags &= ~OBD_ATTACHED;
243 obddev->obd_type->typ_refcnt--;
244 obddev->obd_type = NULL;
250 case OBD_IOC_FORMAT: {
256 /* have we attached a type to this device */
257 if ( !obddev->obd_type ) {
258 CDEBUG(D_IOCTL, "OBD Device %d has no type.\n", dev);
262 /* get main structure */
263 err = copy_from_user(&input, (void *) arg, sizeof(input));
267 err = getdata(input.format_datalen, &input.format_data);
271 if (!obddev->obd_type->typ_ops ||
272 !obddev->obd_type->typ_ops->o_format )
276 CDEBUG(D_IOCTL, "Format %d, type %s\n", dev,
277 obddev->obd_type->typ_name);
278 err = obddev->obd_type->typ_ops->o_format
279 (obddev, input.format_datalen, input.format_data);
281 OBD_FREE(input.format_data, input.format_datalen);
284 case OBD_IOC_PARTITION: {
290 /* have we attached a type to this device */
291 if ( !obddev->obd_type ) {
292 CDEBUG(D_IOCTL, "OBD Device %d has no type.\n", dev);
296 /* get main structure */
297 err = copy_from_user(&input, (void *) arg, sizeof(input));
301 err = getdata(input.part_datalen, &input.part_data);
305 if (!obddev->obd_type->typ_ops ||
306 !obddev->obd_type->typ_ops->o_partition )
309 /* do the partition */
310 CDEBUG(D_IOCTL, "Partition %d, type %s\n", dev,
311 obddev->obd_type->typ_name);
312 err = obddev->obd_type->typ_ops->o_partition
313 (obddev, input.part_datalen, input.part_data);
315 OBD_FREE(input.part_data, input.part_datalen);
320 struct ioc_mv_s mvdata;
325 obdattr *srcoa, *tgtoa;
327 if ( (!(obddev->obd_flags & OBD_SET_UP)) ||
328 (!(obddev->obd_flags & OBD_ATTACHED))) {
329 CDEBUG(D_IOCTL, "Device not attached or set up\n");
333 /* get main structure */
334 err = copy_from_user(&input, (void *) arg, sizeof(input));
339 err = copy_from_user(&mvdata, input.part_data, sizeof(mvdata));
343 if (!obddev->obd_type->typ_ops ||
344 !obddev->obd_type->typ_ops->o_copy )
347 /* do the partition */
348 CDEBUG(D_IOCTL, "Copy %d, type %s src %ld tgt %ld\n", dev,
349 obddev->obd_type->typ_name, mvdata.src, mvdata.tgt);
351 conn.oc_id = mvdata.conn_id;
352 srcoa = obd_oa_fromid(&conn, mvdata.src);
355 tgtoa = obd_oa_fromid(&conn, mvdata.tgt);
361 err = obddev->obd_type->typ_ops->o_copy(&conn,srcoa, tgtoa);
368 struct ioc_mv_s mvdata;
373 obdattr *srcoa, *tgtoa;
375 if ( (!(obddev->obd_flags & OBD_SET_UP)) ||
376 (!(obddev->obd_flags & OBD_ATTACHED))) {
377 CDEBUG(D_IOCTL, "Device not attached or set up\n");
381 /* get main structure */
382 err = copy_from_user(&input, (void *) arg, sizeof(input));
387 CDEBUG(D_IOCTL, "Migrate copying %d\n", sizeof(mvdata));
388 err = copy_from_user(&mvdata, input.part_data, sizeof(mvdata));
392 if (!obddev->obd_type->typ_ops ||
393 !obddev->obd_type->typ_ops->o_copy )
396 /* do the partition */
397 CDEBUG(D_IOCTL, "Migrate %d, type %s conn %d src %ld tgt %ld\n", dev,
398 obddev->obd_type->typ_name, mvdata.conn_id, mvdata.src, mvdata.tgt);
401 if ( ! (srcoa = obd_empty_oa()) )
403 if ( ! (tgtoa = obd_empty_oa()) ) {
408 srcoa->i_ino = mvdata.src;
409 tgtoa->i_ino = mvdata.tgt;
411 conn.oc_id = mvdata.conn_id;
413 err = obddev->obd_type->typ_ops->o_migrate(&conn, tgtoa, srcoa);
420 case OBD_IOC_SETUP: {
426 /* have we attached a type to this device */
427 if (!(obddev->obd_flags & OBD_ATTACHED)) {
428 CDEBUG(D_IOCTL, "OBD Device %d has no type.\n", dev);
432 /* has this been done already? */
433 if ( obddev->obd_flags & OBD_SET_UP ) {
434 CDEBUG(D_IOCTL, "Device %d already setup (type %s)\n",
435 dev, obddev->obd_type->typ_name);
439 /* get main structure */
440 err = copy_from_user(&input, (void *) arg, sizeof(input));
444 err = getdata(input.setup_datalen, &input.setup_data);
450 CDEBUG(D_IOCTL, "Setup %d, type %s\n", dev,
451 obddev->obd_type->typ_name);
452 if ( !obddev->obd_type->typ_ops ||
453 !obddev->obd_type->typ_ops->o_setup ) {
454 obddev->obd_flags |= OBD_SET_UP;
458 err = obddev->obd_type->typ_ops->o_setup
459 (obddev, input.setup_datalen, input.setup_data);
462 obddev->obd_flags &= ~OBD_SET_UP;
464 obddev->obd_type->typ_refcnt++;
465 obddev->obd_flags |= OBD_SET_UP;
469 case OBD_IOC_CLEANUP: {
472 /* has this minor been registered? */
473 if (!obddev->obd_type)
476 if ( !obddev->obd_type->typ_refcnt )
477 printk("OBD_CLEANUP: refcount wrap!\n");
479 if ( !obddev->obd_flags & OBD_SET_UP )
482 if ( !obddev->obd_type->typ_ops->o_cleanup )
485 /* cleanup has no argument */
486 rc = OBP(obddev, cleanup)(obddev);
491 obddev->obd_flags &= ~OBD_SET_UP;
492 obddev->obd_type->typ_refcnt--;
495 case OBD_IOC_CONNECT:
498 if ( (!(obddev->obd_flags & OBD_SET_UP)) ||
499 (!(obddev->obd_flags & OBD_ATTACHED))) {
500 CDEBUG(D_IOCTL, "Device not attached or set up\n");
505 if (obddev->obd_type->typ_ops->o_connect(&conn))
508 return copy_to_user((int *)arg, &conn.oc_id,
511 case OBD_IOC_DISCONNECT:
512 /* frees data structures */
513 /* has this minor been registered? */
514 if (!obddev->obd_type)
517 get_user(cli_id, (int *) arg);
520 OBP(obddev, disconnect)(&conn);
524 /* sync doesn't need a connection ID, because it knows
525 * what device it was called on, and can thus get the
526 * superblock that it needs. */
527 /* has this minor been registered? */
528 if (!obddev->obd_type)
531 if (!obddev->u.ext2.ext2_sb || !obddev->u.ext2.ext2_sb->s_dev) {
532 CDEBUG(D_IOCTL, "fatal: device not initialized.\n");
535 if ((err = fsync_dev(obddev->u.ext2.ext2_sb->s_dev)))
536 CDEBUG(D_IOCTL, "sync: fsync_dev failure\n");
538 CDEBUG(D_IOCTL, "sync: success\n");
541 return put_user(err, (int *) arg);
543 case OBD_IOC_CREATE: {
545 struct oic_create_s foo;
547 if ( copy_from_user(&foo, (const void *)arg, sizeof(foo)) )
550 /* has this minor been registered? */
551 if ( !(obddev->obd_flags & OBD_ATTACHED) ||
552 !(obddev->obd_flags & OBD_SET_UP))
554 conn.oc_id = foo.conn_id;
556 i_ino = OBP(obddev, create)(&conn, foo.prealloc, &err);
558 CDEBUG(D_IOCTL, "create: obd_inode_new failure\n");
559 /* 0 is the only error value */
560 return put_user(0, (int *) arg);
563 return put_user(i_ino, (int *) arg);
565 case OBD_IOC_DESTROY:
568 unsigned int conn_id;
574 if ( ! (oa = obd_empty_oa()) )
577 /* has this minor been registered? */
578 if (!obddev->obd_type)
582 copy_from_user(&destroy, (int *)arg, sizeof(struct destroy_s));
583 if ( !obddev->obd_type ||
584 !obddev->obd_type->typ_ops->o_destroy)
587 oa->i_ino = destroy.ino;
588 conn.oc_id = destroy.conn_id;
589 rc = obddev->obd_type->typ_ops->o_destroy(&conn, oa);
590 OBD_FREE(oa, sizeof(*oa));
593 case OBD_IOC_SETATTR:
595 struct oic_attr_s foo;
599 if ( ! (oa = obd_empty_oa()) )
602 /* has this minor been registered? */
603 if (!obddev->obd_type)
606 rc = copy_from_user(&foo, (int *)arg, sizeof(foo));
610 if ( !obddev->obd_type ||
611 !obddev->obd_type->typ_ops->o_setattr)
615 inode_setattr(oa, &foo.iattr);
616 conn.oc_id = foo.conn_id;
617 rc = obddev->obd_type->typ_ops->o_setattr(&conn, oa);
618 OBD_FREE(oa, sizeof(*oa));
622 case OBD_IOC_GETATTR:
626 unsigned int conn_id;
632 rc = copy_from_user(&foo, (int *)arg, sizeof(foo));
636 conn.oc_id = foo.conn_id;
637 oa = obd_oa_fromid(&conn, foo.ino);
641 inode_to_iattr(oa, &iattr);
642 rc = copy_to_user((int *)arg, &iattr, sizeof(iattr));
650 struct oic_rw_s rw_s; /* read, write ioctl str */
652 rc = copy_from_user(&rw_s, (int *)arg, sizeof(rw_s));
657 conn.oc_id = rw_s.conn_id;
658 if ( ! (oa = obd_oa_fromid(&conn, rw_s.id)) )
662 if ( !obddev->obd_type->typ_ops ||
663 !obddev->obd_type->typ_ops->o_read )
666 rc = obddev->obd_type->typ_ops->o_read
667 (&conn, oa, rw_s.buf, &rw_s.count, rw_s.offset);
671 rc = copy_to_user((int*)arg, &rw_s.count, sizeof(rw_s.count));
675 OBD_FREE(oa, sizeof(*oa));
679 case OBD_IOC_WRITE: {
682 struct oic_rw_s rw_s; /* read, write ioctl str */
684 rc = copy_from_user(&rw_s, (int *)arg, sizeof(rw_s));
688 conn.oc_id = rw_s.conn_id;
689 oa = obd_oa_fromid(&conn, rw_s.id);
694 if ( !obddev->obd_type->typ_ops ||
695 !obddev->obd_type->typ_ops->o_write )
698 rc = obddev->obd_type->typ_ops->o_write
699 (&conn, oa, rw_s.buf, &rw_s.count, rw_s.offset);
703 rc = copy_to_user((int*)arg, &rw_s.count, sizeof(rw_s.count));
706 OBD_FREE(oa, sizeof(*oa));
709 case OBD_IOC_PREALLOCATE: {
710 struct oic_prealloc_s prealloc;
713 /* has this minor been registered? */
714 if (!obddev->obd_type)
718 rc = copy_from_user(&prealloc, (int *)arg, sizeof(prealloc));
722 if ( !(obddev->obd_flags & OBD_ATTACHED) ||
723 !(obddev->obd_flags & OBD_SET_UP)) {
724 CDEBUG(D_IOCTL, "fatal: device not initialized.\n");
728 if (!obddev->obd_type ||
729 !obddev->obd_type->typ_ops->o_preallocate)
731 conn.oc_id = prealloc.cli_id;
732 rc = obddev->obd_type->typ_ops->o_preallocate
733 (&conn, &prealloc.alloc, prealloc.inodes);
737 return copy_to_user((int *)arg, &prealloc, sizeof(prealloc));
742 unsigned int conn_id;
746 /* has this minor been registered? */
747 if (!obddev->obd_type)
750 tmp = (void *)arg + sizeof(unsigned int);
751 get_user(conn_id, (int *) arg);
752 if ( !obddev->obd_type ||
753 !obddev->obd_type->typ_ops->o_statfs)
756 conn.oc_id = conn_id;
757 rc = obddev->obd_type->typ_ops->o_statfs(&conn, &buf);
760 rc = copy_to_user(tmp, &buf, sizeof(buf));
765 struct obd_type *type;
766 struct oic_generic input;
769 /* get data structures */
770 err = copy_from_user(&input, (void *) arg, sizeof(input));
776 if ( (err = getdata(input.att_typelen + 1, &input.att_type))){
783 type = obd_nm_to_type(input.att_type);
784 OBD_FREE(input.att_type, input.att_typelen + 1);
786 printk("Unknown obd type dev %d\n", dev);
791 if ( !type->typ_ops->o_iocontrol ) {
795 conn.oc_id = input.att_connid;
797 CDEBUG(D_IOCTL, "Calling ioctl %x for type %s, len %d\n",
798 cmd, type->typ_name, input.att_datalen);
800 /* get the generic data */
801 karg = input.att_data;
802 if ( (err = getdata(input.att_datalen, &karg)) ) {
807 err = type->typ_ops->o_iocontrol
808 (cmd, &conn, input.att_datalen,
809 karg, input.att_data);
810 OBD_FREE(karg, input.att_datalen);
818 /* Driver interface done, utility functions follow */
820 int obd_register_type(struct obd_ops *ops, char *nm)
822 struct obd_type *type;
825 if (obd_init_magic != 0x11223344) {
830 if ( obd_nm_to_type(nm) ) {
831 CDEBUG(D_IOCTL, "Type %s already registered\n", nm);
836 OBD_ALLOC(type, struct obd_type * , sizeof(*type));
841 memset(type, 0, sizeof(*type));
842 INIT_LIST_HEAD(&type->typ_chain);
844 list_add(&type->typ_chain, obd_types.next);
851 int obd_unregister_type(char *nm)
853 struct obd_type *type = obd_nm_to_type(nm);
857 printk("OBD: NO TYPE\n");
862 if ( type->typ_refcnt ) {
864 printk("OBD: refcount wrap\n");
869 list_del(&type->typ_chain);
870 OBD_FREE(type, sizeof(*type));
875 /* declare character device */
876 static struct file_operations obd_psdev_fops = {
880 NULL, /* presto_psdev_readdir */
882 obd_class_ioctl, /* ioctl */
883 NULL, /* presto_psdev_mmap */
884 obd_class_open, /* open */
886 obd_class_release, /* release */
889 NULL, /* check_media_change */
890 NULL, /* revalidate */
901 printk(KERN_INFO "OBD class driver v0.002, braam@stelias.com\n");
903 INIT_LIST_HEAD(&obd_types);
905 if (register_chrdev(OBD_PSDEV_MAJOR,"obd_psdev",
907 printk(KERN_ERR "obd_psdev: unable to get major %d\n",
912 for (i = 0; i < MAX_OBD_DEVICES; i++) {
913 memset(&(obd_dev[i]), 0, sizeof(obd_dev[i]));
914 obd_dev[i].obd_minor = i;
915 INIT_LIST_HEAD(&obd_dev[i].obd_gen_clients);
919 obd_init_magic = 0x11223344;
923 EXPORT_SYMBOL(obd_register_type);
924 EXPORT_SYMBOL(obd_unregister_type);
926 EXPORT_SYMBOL(obd_print_entry);
927 EXPORT_SYMBOL(obd_debug_level);
928 EXPORT_SYMBOL(obd_dev);
930 EXPORT_SYMBOL(gen_connect);
931 EXPORT_SYMBOL(gen_client);
932 EXPORT_SYMBOL(gen_cleanup);
933 EXPORT_SYMBOL(gen_disconnect);
934 EXPORT_SYMBOL(gen_copy_data);
936 /* EXPORT_SYMBOL(gen_multi_attach); */
937 EXPORT_SYMBOL(gen_multi_setup);
938 EXPORT_SYMBOL(gen_multi_cleanup);
942 int init_module(void)
947 void cleanup_module(void)
952 unregister_chrdev(OBD_PSDEV_MAJOR, "obd_psdev");
953 for (i = 0; i < MAX_OBD_DEVICES; i++) {
954 struct obd_device *obddev = &obd_dev[i];
955 if ( obddev->obd_type &&
956 (obddev->obd_flags & OBD_SET_UP) &&
957 obddev->obd_type->typ_ops->o_detach ) {
958 OBP(obddev, detach)(obddev);