1 // SPDX-License-Identifier: GPL-2.0-or-later
15  * Insert a volume into a cell.  If there's an existing volume record, that is
18 static struct afs_volume *afs_insert_volume_into_cell(struct afs_cell *cell,  in afs_insert_volume_into_cell()  argument
24 	write_seqlock(&cell->volume_lock);  in afs_insert_volume_into_cell()
26 	pp = &cell->volumes.rb_node;  in afs_insert_volume_into_cell()
30 		if (p->vid < volume->vid) {  in afs_insert_volume_into_cell()
31 			pp = &(*pp)->rb_left;  in afs_insert_volume_into_cell()
32 		} else if (p->vid > volume->vid) {  in afs_insert_volume_into_cell()
33 			pp = &(*pp)->rb_right;  in afs_insert_volume_into_cell()
40 	rb_link_node_rcu(&volume->cell_node, parent, pp);  in afs_insert_volume_into_cell()
41 	rb_insert_color(&volume->cell_node, &cell->volumes);  in afs_insert_volume_into_cell()
42 	hlist_add_head_rcu(&volume->proc_link, &cell->proc_volumes);  in afs_insert_volume_into_cell()
45 	write_sequnlock(&cell->volume_lock);  in afs_insert_volume_into_cell()
52 	struct afs_cell *cell = volume->cell;  in afs_remove_volume_from_cell()  local
54 	if (!hlist_unhashed(&volume->proc_link)) {  in afs_remove_volume_from_cell()
55 		trace_afs_volume(volume->vid, refcount_read(&cell->ref),  in afs_remove_volume_from_cell()
57 		write_seqlock(&cell->volume_lock);  in afs_remove_volume_from_cell()
58 		hlist_del_rcu(&volume->proc_link);  in afs_remove_volume_from_cell()
59 		rb_erase(&volume->cell_node, &cell->volumes);  in afs_remove_volume_from_cell()
60 		write_sequnlock(&cell->volume_lock);  in afs_remove_volume_from_cell()
73 	int ret = -ENOMEM, nr_servers = 0, i;  in afs_alloc_volume()
75 	for (i = 0; i < vldb->nr_servers; i++)  in afs_alloc_volume()
76 		if (vldb->fs_mask[i] & type_mask)  in afs_alloc_volume()
83 	volume->vid		= vldb->vid[params->type];  in afs_alloc_volume()
84 	volume->update_at	= ktime_get_real_seconds() + afs_volume_record_life;  in afs_alloc_volume()
85 	volume->cell		= afs_get_cell(params->cell, afs_cell_trace_get_vol);  in afs_alloc_volume()
86 	volume->type		= params->type;  in afs_alloc_volume()
87 	volume->type_force	= params->force;  in afs_alloc_volume()
88 	volume->name_len	= vldb->name_len;  in afs_alloc_volume()
90 	refcount_set(&volume->ref, 1);  in afs_alloc_volume()
91 	INIT_HLIST_NODE(&volume->proc_link);  in afs_alloc_volume()
92 	rwlock_init(&volume->servers_lock);  in afs_alloc_volume()
93 	rwlock_init(&volume->cb_v_break_lock);  in afs_alloc_volume()
94 	memcpy(volume->name, vldb->name, vldb->name_len + 1);  in afs_alloc_volume()
96 	slist = afs_alloc_server_list(params->cell, params->key, vldb, type_mask);  in afs_alloc_volume()
102 	refcount_set(&slist->usage, 1);  in afs_alloc_volume()
103 	rcu_assign_pointer(volume->servers, slist);  in afs_alloc_volume()
104 	trace_afs_volume(volume->vid, 1, afs_volume_trace_alloc);  in afs_alloc_volume()
108 	afs_put_cell(volume->cell, afs_cell_trace_put_vol);  in afs_alloc_volume()
127 	volume = afs_insert_volume_into_cell(params->cell, candidate);  in afs_lookup_volume()
129 		afs_put_volume(params->net, candidate, afs_volume_trace_put_cell_dup);  in afs_lookup_volume()
136 static struct afs_vldb_entry *afs_vl_lookup_vldb(struct afs_cell *cell,  in afs_vl_lookup_vldb()  argument
141 	struct afs_vldb_entry *vldb = ERR_PTR(-EDESTADDRREQ);  in afs_vl_lookup_vldb()
145 	if (!afs_begin_vlserver_operation(&vc, cell, key))  in afs_vl_lookup_vldb()
146 		return ERR_PTR(-ERESTARTSYS);  in afs_vl_lookup_vldb()
161  *	"%[cell:]volume[.]"		R/W volume
162  *	"#[cell:]volume[.]"		R/O or R/W volume (rwparent=0),
164  *	"%[cell:]volume.readonly"	R/O volume
165  *	"#[cell:]volume.readonly"	R/O volume
166  *	"%[cell:]volume.backup"		Backup volume
167  *	"#[cell:]volume.backup"		Backup volume
169  * The cell name is optional, and defaults to the current cell.
173  * - Rule 1: Explicit type suffix forces access of that type or nothing
174  *           (no suffix, then use Rule 2 & 3)
175  * - Rule 2: If parent volume is R/O, then mount R/O volume by preference, R/W
177  * - Rule 3: If parent volume is R/W, then only mount R/W volume unless
184 	unsigned long type_mask = 1UL << params->type;  in afs_create_volume()
186 	vldb = afs_vl_lookup_vldb(params->cell, params->key,  in afs_create_volume()
187 				  params->volname, params->volnamesz);  in afs_create_volume()
191 	if (test_bit(AFS_VLDB_QUERY_ERROR, &vldb->flags)) {  in afs_create_volume()
192 		volume = ERR_PTR(vldb->error);  in afs_create_volume()
197 	volume = ERR_PTR(-ENOMEDIUM);  in afs_create_volume()
198 	if (params->force) {  in afs_create_volume()
199 		if (!(vldb->flags & type_mask))  in afs_create_volume()
201 	} else if (test_bit(AFS_VLDB_HAS_RO, &vldb->flags)) {  in afs_create_volume()
202 		params->type = AFSVL_ROVOL;  in afs_create_volume()
203 	} else if (test_bit(AFS_VLDB_HAS_RW, &vldb->flags)) {  in afs_create_volume()
204 		params->type = AFSVL_RWVOL;  in afs_create_volume()
209 	type_mask = 1UL << params->type;  in afs_create_volume()
225 	ASSERTCMP(volume->cache, ==, NULL);  in afs_destroy_volume()
229 	afs_put_serverlist(net, rcu_access_pointer(volume->servers));  in afs_destroy_volume()
230 	afs_put_cell(volume->cell, afs_cell_trace_put_vol);  in afs_destroy_volume()
231 	trace_afs_volume(volume->vid, refcount_read(&volume->ref),  in afs_destroy_volume()
247 		__refcount_inc(&volume->ref, &r);  in afs_get_volume()
248 		trace_afs_volume(volume->vid, r + 1, reason);  in afs_get_volume()
261 		afs_volid_t vid = volume->vid;  in afs_put_volume()
265 		zero = __refcount_dec_and_test(&volume->ref, &r);  in afs_put_volume()
266 		trace_afs_volume(vid, r - 1, reason);  in afs_put_volume()
282 			 volume->cell->name, volume->vid);  in afs_activate_volume()
284 		return -ENOMEM;  in afs_activate_volume()
288 		if (vcookie != ERR_PTR(-EBUSY)) {  in afs_activate_volume()
295 	volume->cache = vcookie;  in afs_activate_volume()
306 	_enter("%s", volume->name);  in afs_deactivate_volume()
309 	fscache_relinquish_volume(volume->cache, NULL,  in afs_deactivate_volume()
310 				  test_bit(AFS_VOLUME_DELETED, &volume->flags));  in afs_deactivate_volume()
311 	volume->cache = NULL;  in afs_deactivate_volume()
332 	idsz = sprintf(idbuf, "%llu", volume->vid);  in afs_update_volume_status()
334 	vldb = afs_vl_lookup_vldb(volume->cell, key, idbuf, idsz);  in afs_update_volume_status()
341 	if (vldb->name_len != volume->name_len ||  in afs_update_volume_status()
342 	    memcmp(vldb->name, volume->name, vldb->name_len) != 0) {  in afs_update_volume_status()
344 		memcpy(volume->name, vldb->name, AFS_MAXVOLNAME);  in afs_update_volume_status()
345 		volume->name_len = vldb->name_len;  in afs_update_volume_status()
349 	new = afs_alloc_server_list(volume->cell, key,  in afs_update_volume_status()
350 				    vldb, (1 << volume->type));  in afs_update_volume_status()
356 	write_lock(&volume->servers_lock);  in afs_update_volume_status()
359 	old = rcu_dereference_protected(volume->servers,  in afs_update_volume_status()
360 					lockdep_is_held(&volume->servers_lock));  in afs_update_volume_status()
362 		new->seq = volume->servers_seq + 1;  in afs_update_volume_status()
363 		rcu_assign_pointer(volume->servers, new);  in afs_update_volume_status()
365 		volume->servers_seq++;  in afs_update_volume_status()
369 	volume->update_at = ktime_get_real_seconds() + afs_volume_record_life;  in afs_update_volume_status()
370 	write_unlock(&volume->servers_lock);  in afs_update_volume_status()
373 	afs_put_serverlist(volume->cell->net, discard);  in afs_update_volume_status()
391 	if (test_bit(AFS_VOLUME_WAIT, &volume->flags))  in afs_check_volume_status()
393 	if (volume->update_at <= ktime_get_real_seconds() ||  in afs_check_volume_status()
394 	    test_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags))  in afs_check_volume_status()
400 	if (!test_and_set_bit_lock(AFS_VOLUME_UPDATING, &volume->flags)) {  in afs_check_volume_status()
401 		clear_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags);  in afs_check_volume_status()
402 		ret = afs_update_volume_status(volume, op->key);  in afs_check_volume_status()
404 			set_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags);  in afs_check_volume_status()
405 		clear_bit_unlock(AFS_VOLUME_WAIT, &volume->flags);  in afs_check_volume_status()
406 		clear_bit_unlock(AFS_VOLUME_UPDATING, &volume->flags);  in afs_check_volume_status()
407 		wake_up_bit(&volume->flags, AFS_VOLUME_WAIT);  in afs_check_volume_status()
413 	if (!test_bit(AFS_VOLUME_WAIT, &volume->flags)) {  in afs_check_volume_status()
418 	ret = wait_on_bit(&volume->flags, AFS_VOLUME_WAIT,  in afs_check_volume_status()
419 			  (op->flags & AFS_OPERATION_UNINTR) ?  in afs_check_volume_status()
421 	if (ret == -ERESTARTSYS) {  in afs_check_volume_status()
428 		_leave(" = -ESTALE");  in afs_check_volume_status()
429 		return -ESTALE;  in afs_check_volume_status()