1 // SPDX-License-Identifier: GPL-2.0-or-later
17  * Insert a volume into a cell.  If there's an existing volume record, that is
20 static struct afs_volume *afs_insert_volume_into_cell(struct afs_cell *cell,  in afs_insert_volume_into_cell()  argument
26 	write_seqlock(&cell->volume_lock);  in afs_insert_volume_into_cell()
28 	pp = &cell->volumes.rb_node;  in afs_insert_volume_into_cell()
32 		if (p->vid < volume->vid) {  in afs_insert_volume_into_cell()
33 			pp = &(*pp)->rb_left;  in afs_insert_volume_into_cell()
34 		} else if (p->vid > volume->vid) {  in afs_insert_volume_into_cell()
35 			pp = &(*pp)->rb_right;  in afs_insert_volume_into_cell()
42 			set_bit(AFS_VOLUME_RM_TREE, &volume->flags);  in afs_insert_volume_into_cell()
43 			rb_replace_node_rcu(&p->cell_node, &volume->cell_node, &cell->volumes);  in afs_insert_volume_into_cell()
47 	rb_link_node_rcu(&volume->cell_node, parent, pp);  in afs_insert_volume_into_cell()
48 	rb_insert_color(&volume->cell_node, &cell->volumes);  in afs_insert_volume_into_cell()
49 	hlist_add_head_rcu(&volume->proc_link, &cell->proc_volumes);  in afs_insert_volume_into_cell()
52 	write_sequnlock(&cell->volume_lock);  in afs_insert_volume_into_cell()
59 	struct afs_cell *cell = volume->cell;  in afs_remove_volume_from_cell()  local
61 	if (!hlist_unhashed(&volume->proc_link)) {  in afs_remove_volume_from_cell()
62 		trace_afs_volume(volume->vid, refcount_read(&cell->ref),  in afs_remove_volume_from_cell()
64 		write_seqlock(&cell->volume_lock);  in afs_remove_volume_from_cell()
65 		hlist_del_rcu(&volume->proc_link);  in afs_remove_volume_from_cell()
66 		if (!test_and_set_bit(AFS_VOLUME_RM_TREE, &volume->flags))  in afs_remove_volume_from_cell()
67 			rb_erase(&volume->cell_node, &cell->volumes);  in afs_remove_volume_from_cell()
68 		write_sequnlock(&cell->volume_lock);  in afs_remove_volume_from_cell()
81 	int ret = -ENOMEM, i;  in afs_alloc_volume()
87 	volume->vid		= vldb->vid[params->type];  in afs_alloc_volume()
88 	volume->update_at	= ktime_get_real_seconds() + afs_volume_record_life;  in afs_alloc_volume()
89 	volume->cell		= afs_get_cell(params->cell, afs_cell_trace_get_vol);  in afs_alloc_volume()
90 	volume->type		= params->type;  in afs_alloc_volume()
91 	volume->type_force	= params->force;  in afs_alloc_volume()
92 	volume->name_len	= vldb->name_len;  in afs_alloc_volume()
93 	volume->creation_time	= TIME64_MIN;  in afs_alloc_volume()
94 	volume->update_time	= TIME64_MIN;  in afs_alloc_volume()
96 	refcount_set(&volume->ref, 1);  in afs_alloc_volume()
97 	INIT_HLIST_NODE(&volume->proc_link);  in afs_alloc_volume()
98 	INIT_WORK(&volume->destructor, afs_destroy_volume);  in afs_alloc_volume()
99 	rwlock_init(&volume->servers_lock);  in afs_alloc_volume()
100 	mutex_init(&volume->volsync_lock);  in afs_alloc_volume()
101 	mutex_init(&volume->cb_check_lock);  in afs_alloc_volume()
102 	rwlock_init(&volume->cb_v_break_lock);  in afs_alloc_volume()
103 	INIT_LIST_HEAD(&volume->open_mmaps);  in afs_alloc_volume()
104 	init_rwsem(&volume->open_mmaps_lock);  in afs_alloc_volume()
105 	memcpy(volume->name, vldb->name, vldb->name_len + 1);  in afs_alloc_volume()
108 		volume->vids[i] = vldb->vid[i];  in afs_alloc_volume()
110 	slist = afs_alloc_server_list(volume, params->key, vldb);  in afs_alloc_volume()
117 	rcu_assign_pointer(volume->servers, slist);  in afs_alloc_volume()
118 	trace_afs_volume(volume->vid, 1, afs_volume_trace_alloc);  in afs_alloc_volume()
122 	afs_put_cell(volume->cell, afs_cell_trace_put_vol);  in afs_alloc_volume()
141 	volume = afs_insert_volume_into_cell(params->cell, candidate);  in afs_lookup_volume()
152 static struct afs_vldb_entry *afs_vl_lookup_vldb(struct afs_cell *cell,  in afs_vl_lookup_vldb()  argument
157 	struct afs_vldb_entry *vldb = ERR_PTR(-EDESTADDRREQ);  in afs_vl_lookup_vldb()
161 	if (!afs_begin_vlserver_operation(&vc, cell, key))  in afs_vl_lookup_vldb()
162 		return ERR_PTR(-ERESTARTSYS);  in afs_vl_lookup_vldb()
177  *	"%[cell:]volume[.]"		R/W volume
178  *	"#[cell:]volume[.]"		R/O or R/W volume (rwparent=0),
179  *					 or R/W (rwparent=1) volume
180  *	"%[cell:]volume.readonly"	R/O volume
181  *	"#[cell:]volume.readonly"	R/O volume
182  *	"%[cell:]volume.backup"		Backup volume
183  *	"#[cell:]volume.backup"		Backup volume
185  * The cell name is optional, and defaults to the current cell.
189  * - Rule 1: Explicit type suffix forces access of that type or nothing
191  * - Rule 2: If parent volume is R/O, then mount R/O volume by preference, R/W
193  * - Rule 3: If parent volume is R/W, then only mount R/W volume unless
200 	unsigned long type_mask = 1UL << params->type;  in afs_create_volume()
202 	vldb = afs_vl_lookup_vldb(params->cell, params->key,  in afs_create_volume()
203 				  params->volname, params->volnamesz);  in afs_create_volume()
207 	if (test_bit(AFS_VLDB_QUERY_ERROR, &vldb->flags)) {  in afs_create_volume()
208 		volume = ERR_PTR(vldb->error);  in afs_create_volume()
213 	volume = ERR_PTR(-ENOMEDIUM);  in afs_create_volume()
214 	if (params->force) {  in afs_create_volume()
215 		if (!(vldb->flags & type_mask))  in afs_create_volume()
217 	} else if (test_bit(AFS_VLDB_HAS_RO, &vldb->flags)) {  in afs_create_volume()
218 		params->type = AFSVL_ROVOL;  in afs_create_volume()
219 	} else if (test_bit(AFS_VLDB_HAS_RW, &vldb->flags)) {  in afs_create_volume()
220 		params->type = AFSVL_RWVOL;  in afs_create_volume()
238 	struct afs_server_list *slist = rcu_access_pointer(volume->servers);  in afs_destroy_volume()
243 	ASSERTCMP(volume->cache, ==, NULL);  in afs_destroy_volume()
248 	afs_put_serverlist(volume->cell->net, slist);  in afs_destroy_volume()
249 	afs_put_cell(volume->cell, afs_cell_trace_put_vol);  in afs_destroy_volume()
250 	trace_afs_volume(volume->vid, refcount_read(&volume->ref),  in afs_destroy_volume()
264 	if (__refcount_inc_not_zero(&volume->ref, &r)) {  in afs_try_get_volume()
265 		trace_afs_volume(volume->vid, r + 1, reason);  in afs_try_get_volume()
280 		__refcount_inc(&volume->ref, &r);  in afs_get_volume()
281 		trace_afs_volume(volume->vid, r + 1, reason);  in afs_get_volume()
293 		afs_volid_t vid = volume->vid;  in afs_put_volume()
297 		zero = __refcount_dec_and_test(&volume->ref, &r);  in afs_put_volume()
298 		trace_afs_volume(vid, r - 1, reason);  in afs_put_volume()
300 			schedule_work(&volume->destructor);  in afs_put_volume()
314 			 volume->cell->name, volume->vid);  in afs_activate_volume()
316 		return -ENOMEM;  in afs_activate_volume()
320 		if (vcookie != ERR_PTR(-EBUSY)) {  in afs_activate_volume()
327 	volume->cache = vcookie;  in afs_activate_volume()
338 	_enter("%s", volume->name);  in afs_deactivate_volume()
341 	fscache_relinquish_volume(volume->cache, NULL,  in afs_deactivate_volume()
342 				  test_bit(AFS_VOLUME_DELETED, &volume->flags));  in afs_deactivate_volume()
343 	volume->cache = NULL;  in afs_deactivate_volume()
364 	idsz = snprintf(idbuf, sizeof(idbuf), "%llu", volume->vid);  in afs_update_volume_status()
366 	vldb = afs_vl_lookup_vldb(volume->cell, key, idbuf, idsz);  in afs_update_volume_status()
373 	if (vldb->name_len != volume->name_len ||  in afs_update_volume_status()
374 	    memcmp(vldb->name, volume->name, vldb->name_len) != 0) {  in afs_update_volume_status()
376 		memcpy(volume->name, vldb->name, AFS_MAXVOLNAME);  in afs_update_volume_status()
377 		volume->name_len = vldb->name_len;  in afs_update_volume_status()
387 	write_lock(&volume->servers_lock);  in afs_update_volume_status()
390 	old = rcu_dereference_protected(volume->servers,  in afs_update_volume_status()
391 					lockdep_is_held(&volume->servers_lock));  in afs_update_volume_status()
393 		new->seq = volume->servers_seq + 1;  in afs_update_volume_status()
394 		rcu_assign_pointer(volume->servers, new);  in afs_update_volume_status()
396 		volume->servers_seq++;  in afs_update_volume_status()
401 	if (new->ro_replicating)  in afs_update_volume_status()
402 		volume->update_at = ktime_get_real_seconds() + 10 * 60;  in afs_update_volume_status()
404 		volume->update_at = ktime_get_real_seconds() + afs_volume_record_life;  in afs_update_volume_status()
405 	write_unlock(&volume->servers_lock);  in afs_update_volume_status()
409 	afs_put_serverlist(volume->cell->net, discard);  in afs_update_volume_status()
428 	if (test_bit(AFS_VOLUME_WAIT, &volume->flags))  in afs_check_volume_status()
430 	if (volume->update_at <= ktime_get_real_seconds() ||  in afs_check_volume_status()
431 	    test_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags))  in afs_check_volume_status()
437 	if (!test_and_set_bit_lock(AFS_VOLUME_UPDATING, &volume->flags)) {  in afs_check_volume_status()
438 		clear_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags);  in afs_check_volume_status()
439 		ret = afs_update_volume_status(volume, op->key);  in afs_check_volume_status()
441 			set_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags);  in afs_check_volume_status()
442 		clear_bit_unlock(AFS_VOLUME_WAIT, &volume->flags);  in afs_check_volume_status()
443 		clear_bit_unlock(AFS_VOLUME_UPDATING, &volume->flags);  in afs_check_volume_status()
444 		wake_up_bit(&volume->flags, AFS_VOLUME_WAIT);  in afs_check_volume_status()
450 	if (!test_bit(AFS_VOLUME_WAIT, &volume->flags)) {  in afs_check_volume_status()
455 	ret = wait_on_bit(&volume->flags, AFS_VOLUME_WAIT,  in afs_check_volume_status()
456 			  (op->flags & AFS_OPERATION_UNINTR) ?  in afs_check_volume_status()
458 	if (ret == -ERESTARTSYS) {  in afs_check_volume_status()
465 		_leave(" = -ESTALE");  in afs_check_volume_status()
466 		return -ESTALE;  in afs_check_volume_status()