Lines Matching refs:volume
2 /* AFS volume management
17 * Insert a volume into a cell. If there's an existing volume record, that is
21 struct afs_volume *volume)
32 if (p->vid < volume->vid) {
34 } else if (p->vid > volume->vid) {
38 volume = p;
42 set_bit(AFS_VOLUME_RM_TREE, &volume->flags);
43 rb_replace_node_rcu(&p->cell_node, &volume->cell_node, &cell->volumes);
47 rb_link_node_rcu(&volume->cell_node, parent, pp);
48 rb_insert_color(&volume->cell_node, &cell->volumes);
49 hlist_add_head_rcu(&volume->proc_link, &cell->proc_volumes);
53 return volume;
57 static void afs_remove_volume_from_cell(struct afs_volume *volume)
59 struct afs_cell *cell = volume->cell;
61 if (!hlist_unhashed(&volume->proc_link)) {
62 trace_afs_volume(volume->vid, refcount_read(&cell->ref),
65 hlist_del_rcu(&volume->proc_link);
66 if (!test_and_set_bit(AFS_VOLUME_RM_TREE, &volume->flags))
67 rb_erase(&volume->cell_node, &cell->volumes);
73 * Allocate a volume record and load it up from a vldb record.
80 struct afs_volume *volume;
83 volume = kzalloc(sizeof(struct afs_volume), GFP_KERNEL);
84 if (!volume)
87 volume->vid = vldb->vid[params->type];
88 volume->update_at = ktime_get_real_seconds() + afs_volume_record_life;
89 volume->cell = afs_get_cell(params->cell, afs_cell_trace_get_vol);
90 volume->type = params->type;
91 volume->type_force = params->force;
92 volume->name_len = vldb->name_len;
93 volume->creation_time = TIME64_MIN;
94 volume->update_time = TIME64_MIN;
96 refcount_set(&volume->ref, 1);
97 INIT_HLIST_NODE(&volume->proc_link);
98 INIT_WORK(&volume->destructor, afs_destroy_volume);
99 rwlock_init(&volume->servers_lock);
100 mutex_init(&volume->volsync_lock);
101 mutex_init(&volume->cb_check_lock);
102 rwlock_init(&volume->cb_v_break_lock);
103 INIT_LIST_HEAD(&volume->open_mmaps);
104 init_rwsem(&volume->open_mmaps_lock);
105 memcpy(volume->name, vldb->name, vldb->name_len + 1);
108 volume->vids[i] = vldb->vid[i];
110 slist = afs_alloc_server_list(volume, params->key, vldb);
117 rcu_assign_pointer(volume->servers, slist);
118 trace_afs_volume(volume->vid, 1, afs_volume_trace_alloc);
119 return volume;
122 afs_put_cell(volume->cell, afs_cell_trace_put_vol);
123 kfree(volume);
129 * Look up or allocate a volume record.
135 struct afs_volume *candidate, *volume;
141 volume = afs_insert_volume_into_cell(params->cell, candidate);
142 if (volume == candidate)
143 afs_attach_volume_to_servers(volume, slist);
146 return volume;
150 * Look up a VLDB record for a volume.
173 * Look up a volume in the VL server and create a candidate volume record for
176 * The volume name can be one of the following:
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
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
199 struct afs_volume *volume;
208 volume = ERR_PTR(vldb->error);
213 volume = ERR_PTR(-ENOMEDIUM);
225 volume = afs_lookup_volume(params, vldb);
229 return volume;
233 * Destroy a volume record
237 struct afs_volume *volume = container_of(work, struct afs_volume, destructor);
238 struct afs_server_list *slist = rcu_access_pointer(volume->servers);
240 _enter("%p", volume);
243 ASSERTCMP(volume->cache, ==, NULL);
246 afs_detach_volume_from_servers(volume, slist);
247 afs_remove_volume_from_cell(volume);
248 afs_put_serverlist(volume->cell->net, slist);
249 afs_put_cell(volume->cell, afs_cell_trace_put_vol);
250 trace_afs_volume(volume->vid, refcount_read(&volume->ref),
252 kfree_rcu(volume, rcu);
258 * Try to get a reference on a volume record.
260 bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason)
264 if (__refcount_inc_not_zero(&volume->ref, &r)) {
265 trace_afs_volume(volume->vid, r + 1, reason);
272 * Get a reference on a volume record.
274 struct afs_volume *afs_get_volume(struct afs_volume *volume,
277 if (volume) {
280 __refcount_inc(&volume->ref, &r);
281 trace_afs_volume(volume->vid, r + 1, reason);
283 return volume;
288 * Drop a reference on a volume record.
290 void afs_put_volume(struct afs_volume *volume, enum afs_volume_trace reason)
292 if (volume) {
293 afs_volid_t vid = volume->vid;
297 zero = __refcount_dec_and_test(&volume->ref, &r);
300 schedule_work(&volume->destructor);
305 * Activate a volume.
307 int afs_activate_volume(struct afs_volume *volume)
314 volume->cell->name, volume->vid);
324 pr_err("AFS: Cache volume key already in use (%s)\n", name);
327 volume->cache = vcookie;
334 * Deactivate a volume.
336 void afs_deactivate_volume(struct afs_volume *volume)
338 _enter("%s", volume->name);
341 fscache_relinquish_volume(volume->cache, NULL,
342 test_bit(AFS_VOLUME_DELETED, &volume->flags));
343 volume->cache = NULL;
350 * Query the VL service to update the volume status.
352 static int afs_update_volume_status(struct afs_volume *volume, struct key *key)
364 idsz = snprintf(idbuf, sizeof(idbuf), "%llu", volume->vid);
366 vldb = afs_vl_lookup_vldb(volume->cell, key, idbuf, idsz);
372 /* See if the volume got renamed. */
373 if (vldb->name_len != volume->name_len ||
374 memcmp(vldb->name, volume->name, vldb->name_len) != 0) {
376 memcpy(volume->name, vldb->name, AFS_MAXVOLNAME);
377 volume->name_len = vldb->name_len;
380 /* See if the volume's server list got updated. */
381 new = afs_alloc_server_list(volume, key, vldb);
387 write_lock(&volume->servers_lock);
390 old = rcu_dereference_protected(volume->servers,
391 lockdep_is_held(&volume->servers_lock));
393 new->seq = volume->servers_seq + 1;
394 rcu_assign_pointer(volume->servers, new);
396 volume->servers_seq++;
402 volume->update_at = ktime_get_real_seconds() + 10 * 60;
404 volume->update_at = ktime_get_real_seconds() + afs_volume_record_life;
405 write_unlock(&volume->servers_lock);
408 afs_reattach_volume_to_servers(volume, new, old);
409 afs_put_serverlist(volume->cell->net, discard);
419 * Make sure the volume record is up to date.
421 int afs_check_volume_status(struct afs_volume *volume, struct afs_operation *op)
428 if (test_bit(AFS_VOLUME_WAIT, &volume->flags))
430 if (volume->update_at <= ktime_get_real_seconds() ||
431 test_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags))
437 if (!test_and_set_bit_lock(AFS_VOLUME_UPDATING, &volume->flags)) {
438 clear_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags);
439 ret = afs_update_volume_status(volume, op->key);
441 set_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags);
442 clear_bit_unlock(AFS_VOLUME_WAIT, &volume->flags);
443 clear_bit_unlock(AFS_VOLUME_UPDATING, &volume->flags);
444 wake_up_bit(&volume->flags, AFS_VOLUME_WAIT);
450 if (!test_bit(AFS_VOLUME_WAIT, &volume->flags)) {
455 ret = wait_on_bit(&volume->flags, AFS_VOLUME_WAIT,