Lines Matching refs:volume
2 /* AFS volume management
16 * Insert a volume into a cell. If there's an existing volume record, that is
20 struct afs_volume *volume)
31 if (p->vid < volume->vid) {
33 } else if (p->vid > volume->vid) {
36 volume = afs_get_volume(p, afs_volume_trace_get_cell_insert);
41 rb_link_node_rcu(&volume->cell_node, parent, pp);
42 rb_insert_color(&volume->cell_node, &cell->volumes);
43 hlist_add_head_rcu(&volume->proc_link, &cell->proc_volumes);
47 return volume;
51 static void afs_remove_volume_from_cell(struct afs_volume *volume)
53 struct afs_cell *cell = volume->cell;
55 if (!hlist_unhashed(&volume->proc_link)) {
56 trace_afs_volume(volume->vid, atomic_read(&volume->usage),
59 hlist_del_rcu(&volume->proc_link);
60 rb_erase(&volume->cell_node, &cell->volumes);
66 * Allocate a volume record and load it up from a vldb record.
73 struct afs_volume *volume;
80 volume = kzalloc(sizeof(struct afs_volume), GFP_KERNEL);
81 if (!volume)
84 volume->vid = vldb->vid[params->type];
85 volume->update_at = ktime_get_real_seconds() + afs_volume_record_life;
86 volume->cell = afs_get_cell(params->cell, afs_cell_trace_get_vol);
87 volume->type = params->type;
88 volume->type_force = params->force;
89 volume->name_len = vldb->name_len;
91 atomic_set(&volume->usage, 1);
92 INIT_HLIST_NODE(&volume->proc_link);
93 rwlock_init(&volume->servers_lock);
94 rwlock_init(&volume->cb_v_break_lock);
95 memcpy(volume->name, vldb->name, vldb->name_len + 1);
104 rcu_assign_pointer(volume->servers, slist);
105 trace_afs_volume(volume->vid, 1, afs_volume_trace_alloc);
106 return volume;
109 afs_put_cell(volume->cell, afs_cell_trace_put_vol);
110 kfree(volume);
116 * Look up or allocate a volume record.
122 struct afs_volume *candidate, *volume;
128 volume = afs_insert_volume_into_cell(params->cell, candidate);
129 if (volume != candidate)
131 return volume;
135 * Look up a VLDB record for a volume.
158 * Look up a volume in the VL server and create a candidate volume record for
161 * The volume name can be one of the following:
162 * "%[cell:]volume[.]" R/W volume
163 * "#[cell:]volume[.]" R/O or R/W volume (rwparent=0),
164 * or R/W (rwparent=1) volume
165 * "%[cell:]volume.readonly" R/O volume
166 * "#[cell:]volume.readonly" R/O volume
167 * "%[cell:]volume.backup" Backup volume
168 * "#[cell:]volume.backup" Backup volume
176 * - Rule 2: If parent volume is R/O, then mount R/O volume by preference, R/W
178 * - Rule 3: If parent volume is R/W, then only mount R/W volume unless
184 struct afs_volume *volume;
193 volume = ERR_PTR(vldb->error);
198 volume = ERR_PTR(-ENOMEDIUM);
211 volume = afs_lookup_volume(params, vldb, type_mask);
215 return volume;
219 * Destroy a volume record
221 static void afs_destroy_volume(struct afs_net *net, struct afs_volume *volume)
223 _enter("%p", volume);
226 ASSERTCMP(volume->cache, ==, NULL);
229 afs_remove_volume_from_cell(volume);
230 afs_put_serverlist(net, rcu_access_pointer(volume->servers));
231 afs_put_cell(volume->cell, afs_cell_trace_put_vol);
232 trace_afs_volume(volume->vid, atomic_read(&volume->usage),
234 kfree_rcu(volume, rcu);
240 * Get a reference on a volume record.
242 struct afs_volume *afs_get_volume(struct afs_volume *volume,
245 if (volume) {
246 int u = atomic_inc_return(&volume->usage);
247 trace_afs_volume(volume->vid, u, reason);
249 return volume;
254 * Drop a reference on a volume record.
256 void afs_put_volume(struct afs_net *net, struct afs_volume *volume,
259 if (volume) {
260 afs_volid_t vid = volume->vid;
261 int u = atomic_dec_return(&volume->usage);
264 afs_destroy_volume(net, volume);
269 * Activate a volume.
271 void afs_activate_volume(struct afs_volume *volume)
274 volume->cache = fscache_acquire_cookie(volume->cell->cache,
276 &volume->vid, sizeof(volume->vid),
278 volume, 0, true);
283 * Deactivate a volume.
285 void afs_deactivate_volume(struct afs_volume *volume)
287 _enter("%s", volume->name);
290 fscache_relinquish_cookie(volume->cache, NULL,
291 test_bit(AFS_VOLUME_DELETED, &volume->flags));
292 volume->cache = NULL;
299 * Query the VL service to update the volume status.
301 static int afs_update_volume_status(struct afs_volume *volume, struct key *key)
313 idsz = sprintf(idbuf, "%llu", volume->vid);
315 vldb = afs_vl_lookup_vldb(volume->cell, key, idbuf, idsz);
321 /* See if the volume got renamed. */
322 if (vldb->name_len != volume->name_len ||
323 memcmp(vldb->name, volume->name, vldb->name_len) != 0) {
325 memcpy(volume->name, vldb->name, AFS_MAXVOLNAME);
326 volume->name_len = vldb->name_len;
329 /* See if the volume's server list got updated. */
330 new = afs_alloc_server_list(volume->cell, key,
331 vldb, (1 << volume->type));
337 write_lock(&volume->servers_lock);
340 old = rcu_dereference_protected(volume->servers,
341 lockdep_is_held(&volume->servers_lock));
343 new->seq = volume->servers_seq + 1;
344 rcu_assign_pointer(volume->servers, new);
346 volume->servers_seq++;
350 volume->update_at = ktime_get_real_seconds() + afs_volume_record_life;
351 write_unlock(&volume->servers_lock);
354 afs_put_serverlist(volume->cell->net, discard);
363 * Make sure the volume record is up to date.
365 int afs_check_volume_status(struct afs_volume *volume, struct afs_operation *op)
372 if (test_bit(AFS_VOLUME_WAIT, &volume->flags))
374 if (volume->update_at <= ktime_get_real_seconds() ||
375 test_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags))
381 if (!test_and_set_bit_lock(AFS_VOLUME_UPDATING, &volume->flags)) {
382 clear_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags);
383 ret = afs_update_volume_status(volume, op->key);
385 set_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags);
386 clear_bit_unlock(AFS_VOLUME_WAIT, &volume->flags);
387 clear_bit_unlock(AFS_VOLUME_UPDATING, &volume->flags);
388 wake_up_bit(&volume->flags, AFS_VOLUME_WAIT);
394 if (!test_bit(AFS_VOLUME_WAIT, &volume->flags)) {
399 ret = wait_on_bit(&volume->flags, AFS_VOLUME_WAIT,