Thomas Gleixner | 2874c5f | 2019-05-27 08:55:01 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 2 | /* AFS volume management |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 4 | * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * Written by David Howells (dhowells@redhat.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | */ |
| 7 | |
| 8 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include "internal.h" |
| 11 | |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 12 | unsigned __read_mostly afs_volume_gc_delay = 10; |
| 13 | unsigned __read_mostly afs_volume_record_life = 60 * 60; |
| 14 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | /* |
David Howells | 2032596 | 2020-04-30 01:03:49 +0100 | [diff] [blame] | 16 | * Insert a volume into a cell. If there's an existing volume record, that is |
| 17 | * returned instead with a ref held. |
| 18 | */ |
| 19 | static struct afs_volume *afs_insert_volume_into_cell(struct afs_cell *cell, |
| 20 | struct afs_volume *volume) |
| 21 | { |
| 22 | struct afs_volume *p; |
| 23 | struct rb_node *parent = NULL, **pp; |
| 24 | |
| 25 | write_seqlock(&cell->volume_lock); |
| 26 | |
| 27 | pp = &cell->volumes.rb_node; |
| 28 | while (*pp) { |
| 29 | parent = *pp; |
| 30 | p = rb_entry(parent, struct afs_volume, cell_node); |
| 31 | if (p->vid < volume->vid) { |
| 32 | pp = &(*pp)->rb_left; |
| 33 | } else if (p->vid > volume->vid) { |
| 34 | pp = &(*pp)->rb_right; |
| 35 | } else { |
| 36 | volume = afs_get_volume(p, afs_volume_trace_get_cell_insert); |
| 37 | goto found; |
| 38 | } |
| 39 | } |
| 40 | |
| 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); |
| 44 | |
| 45 | found: |
| 46 | write_sequnlock(&cell->volume_lock); |
| 47 | return volume; |
| 48 | |
| 49 | } |
| 50 | |
| 51 | static void afs_remove_volume_from_cell(struct afs_volume *volume) |
| 52 | { |
| 53 | struct afs_cell *cell = volume->cell; |
| 54 | |
| 55 | if (!hlist_unhashed(&volume->proc_link)) { |
| 56 | trace_afs_volume(volume->vid, atomic_read(&volume->usage), |
| 57 | afs_volume_trace_remove); |
| 58 | write_seqlock(&cell->volume_lock); |
| 59 | hlist_del_rcu(&volume->proc_link); |
| 60 | rb_erase(&volume->cell_node, &cell->volumes); |
| 61 | write_sequnlock(&cell->volume_lock); |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | /* |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 66 | * Allocate a volume record and load it up from a vldb record. |
| 67 | */ |
David Howells | 13fcc68 | 2018-11-01 23:07:27 +0000 | [diff] [blame] | 68 | static struct afs_volume *afs_alloc_volume(struct afs_fs_context *params, |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 69 | struct afs_vldb_entry *vldb, |
| 70 | unsigned long type_mask) |
| 71 | { |
| 72 | struct afs_server_list *slist; |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 73 | struct afs_volume *volume; |
David Howells | 45df846 | 2018-02-06 14:12:32 +0000 | [diff] [blame] | 74 | int ret = -ENOMEM, nr_servers = 0, i; |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 75 | |
| 76 | for (i = 0; i < vldb->nr_servers; i++) |
| 77 | if (vldb->fs_mask[i] & type_mask) |
| 78 | nr_servers++; |
| 79 | |
| 80 | volume = kzalloc(sizeof(struct afs_volume), GFP_KERNEL); |
| 81 | if (!volume) |
| 82 | goto error_0; |
| 83 | |
| 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); |
| 87 | volume->type = params->type; |
| 88 | volume->type_force = params->force; |
| 89 | volume->name_len = vldb->name_len; |
| 90 | |
| 91 | atomic_set(&volume->usage, 1); |
David Howells | 2032596 | 2020-04-30 01:03:49 +0100 | [diff] [blame] | 92 | INIT_HLIST_NODE(&volume->proc_link); |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 93 | rwlock_init(&volume->servers_lock); |
David Howells | 90fa9b6 | 2019-06-20 16:49:35 +0100 | [diff] [blame] | 94 | rwlock_init(&volume->cb_v_break_lock); |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 95 | memcpy(volume->name, vldb->name, vldb->name_len + 1); |
| 96 | |
| 97 | slist = afs_alloc_server_list(params->cell, params->key, vldb, type_mask); |
| 98 | if (IS_ERR(slist)) { |
| 99 | ret = PTR_ERR(slist); |
| 100 | goto error_1; |
| 101 | } |
| 102 | |
| 103 | refcount_set(&slist->usage, 1); |
David Howells | 8a070a9 | 2020-04-25 10:26:02 +0100 | [diff] [blame] | 104 | rcu_assign_pointer(volume->servers, slist); |
David Howells | cca37d4 | 2020-04-29 17:02:04 +0100 | [diff] [blame] | 105 | trace_afs_volume(volume->vid, 1, afs_volume_trace_alloc); |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 106 | return volume; |
| 107 | |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 108 | error_1: |
David Howells | e441501 | 2018-02-06 09:26:27 +0000 | [diff] [blame] | 109 | afs_put_cell(params->net, volume->cell); |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 110 | kfree(volume); |
| 111 | error_0: |
| 112 | return ERR_PTR(ret); |
| 113 | } |
| 114 | |
| 115 | /* |
David Howells | 2032596 | 2020-04-30 01:03:49 +0100 | [diff] [blame] | 116 | * Look up or allocate a volume record. |
| 117 | */ |
| 118 | static struct afs_volume *afs_lookup_volume(struct afs_fs_context *params, |
| 119 | struct afs_vldb_entry *vldb, |
| 120 | unsigned long type_mask) |
| 121 | { |
| 122 | struct afs_volume *candidate, *volume; |
| 123 | |
| 124 | candidate = afs_alloc_volume(params, vldb, type_mask); |
| 125 | if (IS_ERR(candidate)) |
| 126 | return candidate; |
| 127 | |
| 128 | volume = afs_insert_volume_into_cell(params->cell, candidate); |
| 129 | if (volume != candidate) |
| 130 | afs_put_volume(params->net, candidate, afs_volume_trace_put_cell_dup); |
| 131 | return volume; |
| 132 | } |
| 133 | |
| 134 | /* |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 135 | * Look up a VLDB record for a volume. |
| 136 | */ |
| 137 | static struct afs_vldb_entry *afs_vl_lookup_vldb(struct afs_cell *cell, |
| 138 | struct key *key, |
| 139 | const char *volname, |
| 140 | size_t volnamesz) |
| 141 | { |
David Howells | 0a5143f | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 142 | struct afs_vldb_entry *vldb = ERR_PTR(-EDESTADDRREQ); |
| 143 | struct afs_vl_cursor vc; |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 144 | int ret; |
| 145 | |
David Howells | 0a5143f | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 146 | if (!afs_begin_vlserver_operation(&vc, cell, key)) |
| 147 | return ERR_PTR(-ERESTARTSYS); |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 148 | |
David Howells | 0a5143f | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 149 | while (afs_select_vlserver(&vc)) { |
David Howells | 0a5143f | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 150 | vldb = afs_vl_get_entry_by_name_u(&vc, volname, volnamesz); |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 151 | } |
| 152 | |
David Howells | 0a5143f | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 153 | ret = afs_end_vlserver_operation(&vc); |
| 154 | return ret < 0 ? ERR_PTR(ret) : vldb; |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 155 | } |
| 156 | |
| 157 | /* |
| 158 | * Look up a volume in the VL server and create a candidate volume record for |
| 159 | * it. |
| 160 | * |
| 161 | * The volume name can be one of the following: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
| 169 | * |
| 170 | * The cell name is optional, and defaults to the current cell. |
| 171 | * |
| 172 | * See "The Rules of Mount Point Traversal" in Chapter 5 of the AFS SysAdmin |
| 173 | * Guide |
| 174 | * - Rule 1: Explicit type suffix forces access of that type or nothing |
| 175 | * (no suffix, then use Rule 2 & 3) |
| 176 | * - Rule 2: If parent volume is R/O, then mount R/O volume by preference, R/W |
| 177 | * if not available |
| 178 | * - Rule 3: If parent volume is R/W, then only mount R/W volume unless |
| 179 | * explicitly told otherwise |
| 180 | */ |
David Howells | 13fcc68 | 2018-11-01 23:07:27 +0000 | [diff] [blame] | 181 | struct afs_volume *afs_create_volume(struct afs_fs_context *params) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | { |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 183 | struct afs_vldb_entry *vldb; |
| 184 | struct afs_volume *volume; |
| 185 | unsigned long type_mask = 1UL << params->type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 187 | vldb = afs_vl_lookup_vldb(params->cell, params->key, |
| 188 | params->volname, params->volnamesz); |
| 189 | if (IS_ERR(vldb)) |
| 190 | return ERR_CAST(vldb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 192 | if (test_bit(AFS_VLDB_QUERY_ERROR, &vldb->flags)) { |
| 193 | volume = ERR_PTR(vldb->error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | goto error; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 195 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 197 | /* Make the final decision on the type we want */ |
| 198 | volume = ERR_PTR(-ENOMEDIUM); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 199 | if (params->force) { |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 200 | if (!(vldb->flags & type_mask)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | goto error; |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 202 | } else if (test_bit(AFS_VLDB_HAS_RO, &vldb->flags)) { |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 203 | params->type = AFSVL_ROVOL; |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 204 | } else if (test_bit(AFS_VLDB_HAS_RW, &vldb->flags)) { |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 205 | params->type = AFSVL_RWVOL; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 206 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | goto error; |
| 208 | } |
| 209 | |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 210 | type_mask = 1UL << params->type; |
David Howells | 2032596 | 2020-04-30 01:03:49 +0100 | [diff] [blame] | 211 | volume = afs_lookup_volume(params, vldb, type_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 213 | error: |
| 214 | kfree(vldb); |
| 215 | return volume; |
| 216 | } |
| 217 | |
| 218 | /* |
| 219 | * Destroy a volume record |
| 220 | */ |
| 221 | static void afs_destroy_volume(struct afs_net *net, struct afs_volume *volume) |
| 222 | { |
| 223 | _enter("%p", volume); |
| 224 | |
| 225 | #ifdef CONFIG_AFS_FSCACHE |
| 226 | ASSERTCMP(volume->cache, ==, NULL); |
| 227 | #endif |
| 228 | |
David Howells | 2032596 | 2020-04-30 01:03:49 +0100 | [diff] [blame] | 229 | afs_remove_volume_from_cell(volume); |
David Howells | 8a070a9 | 2020-04-25 10:26:02 +0100 | [diff] [blame] | 230 | afs_put_serverlist(net, rcu_access_pointer(volume->servers)); |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 231 | afs_put_cell(net, volume->cell); |
David Howells | cca37d4 | 2020-04-29 17:02:04 +0100 | [diff] [blame] | 232 | trace_afs_volume(volume->vid, atomic_read(&volume->usage), |
| 233 | afs_volume_trace_free); |
David Howells | 2032596 | 2020-04-30 01:03:49 +0100 | [diff] [blame] | 234 | kfree_rcu(volume, rcu); |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 235 | |
| 236 | _leave(" [destroyed]"); |
| 237 | } |
| 238 | |
| 239 | /* |
David Howells | cca37d4 | 2020-04-29 17:02:04 +0100 | [diff] [blame] | 240 | * Get a reference on a volume record. |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 241 | */ |
David Howells | cca37d4 | 2020-04-29 17:02:04 +0100 | [diff] [blame] | 242 | struct afs_volume *afs_get_volume(struct afs_volume *volume, |
| 243 | enum afs_volume_trace reason) |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 244 | { |
| 245 | if (volume) { |
David Howells | cca37d4 | 2020-04-29 17:02:04 +0100 | [diff] [blame] | 246 | int u = atomic_inc_return(&volume->usage); |
| 247 | trace_afs_volume(volume->vid, u, reason); |
| 248 | } |
| 249 | return volume; |
| 250 | } |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 251 | |
David Howells | cca37d4 | 2020-04-29 17:02:04 +0100 | [diff] [blame] | 252 | |
| 253 | /* |
| 254 | * Drop a reference on a volume record. |
| 255 | */ |
| 256 | void afs_put_volume(struct afs_net *net, struct afs_volume *volume, |
| 257 | enum afs_volume_trace reason) |
| 258 | { |
| 259 | if (volume) { |
| 260 | afs_volid_t vid = volume->vid; |
| 261 | int u = atomic_dec_return(&volume->usage); |
| 262 | trace_afs_volume(vid, u, reason); |
| 263 | if (u == 0) |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 264 | afs_destroy_volume(net, volume); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | } |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 266 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 268 | /* |
| 269 | * Activate a volume. |
| 270 | */ |
| 271 | void afs_activate_volume(struct afs_volume *volume) |
| 272 | { |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 273 | #ifdef CONFIG_AFS_FSCACHE |
David Howells | ad6a942 | 2017-11-02 15:27:47 +0000 | [diff] [blame] | 274 | volume->cache = fscache_acquire_cookie(volume->cell->cache, |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 275 | &afs_volume_cache_index_def, |
David Howells | 402cb8d | 2018-04-04 13:41:28 +0100 | [diff] [blame] | 276 | &volume->vid, sizeof(volume->vid), |
| 277 | NULL, 0, |
David Howells | ee1235a | 2018-04-04 13:41:28 +0100 | [diff] [blame] | 278 | volume, 0, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | #endif |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 280 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | /* |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 283 | * Deactivate a volume. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | */ |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 285 | void afs_deactivate_volume(struct afs_volume *volume) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | { |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 287 | _enter("%s", volume->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 289 | #ifdef CONFIG_AFS_FSCACHE |
David Howells | 402cb8d | 2018-04-04 13:41:28 +0100 | [diff] [blame] | 290 | fscache_relinquish_cookie(volume->cache, NULL, |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 291 | test_bit(AFS_VOLUME_DELETED, &volume->flags)); |
| 292 | volume->cache = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 295 | _leave(""); |
| 296 | } |
| 297 | |
| 298 | /* |
| 299 | * Query the VL service to update the volume status. |
| 300 | */ |
| 301 | static int afs_update_volume_status(struct afs_volume *volume, struct key *key) |
| 302 | { |
| 303 | struct afs_server_list *new, *old, *discard; |
| 304 | struct afs_vldb_entry *vldb; |
| 305 | char idbuf[16]; |
| 306 | int ret, idsz; |
| 307 | |
| 308 | _enter(""); |
| 309 | |
| 310 | /* We look up an ID by passing it as a decimal string in the |
| 311 | * operation's name parameter. |
| 312 | */ |
David Howells | 3b6492d | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 313 | idsz = sprintf(idbuf, "%llu", volume->vid); |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 314 | |
| 315 | vldb = afs_vl_lookup_vldb(volume->cell, key, idbuf, idsz); |
| 316 | if (IS_ERR(vldb)) { |
| 317 | ret = PTR_ERR(vldb); |
| 318 | goto error; |
David Howells | c435ee3 | 2017-11-02 15:27:49 +0000 | [diff] [blame] | 319 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 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) { |
| 324 | /* TODO: Use RCU'd string. */ |
| 325 | memcpy(volume->name, vldb->name, AFS_MAXVOLNAME); |
| 326 | volume->name_len = vldb->name_len; |
| 327 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 329 | /* See if the volume's server list got updated. */ |
| 330 | new = afs_alloc_server_list(volume->cell, key, |
David Howells | 45df846 | 2018-02-06 14:12:32 +0000 | [diff] [blame] | 331 | vldb, (1 << volume->type)); |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 332 | if (IS_ERR(new)) { |
| 333 | ret = PTR_ERR(new); |
| 334 | goto error_vldb; |
| 335 | } |
| 336 | |
| 337 | write_lock(&volume->servers_lock); |
| 338 | |
| 339 | discard = new; |
David Howells | 8a070a9 | 2020-04-25 10:26:02 +0100 | [diff] [blame] | 340 | old = rcu_dereference_protected(volume->servers, |
| 341 | lockdep_is_held(&volume->servers_lock)); |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 342 | if (afs_annotate_server_list(new, old)) { |
| 343 | new->seq = volume->servers_seq + 1; |
David Howells | 8a070a9 | 2020-04-25 10:26:02 +0100 | [diff] [blame] | 344 | rcu_assign_pointer(volume->servers, new); |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 345 | smp_wmb(); |
| 346 | volume->servers_seq++; |
| 347 | discard = old; |
| 348 | } |
| 349 | |
| 350 | volume->update_at = ktime_get_real_seconds() + afs_volume_record_life; |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 351 | write_unlock(&volume->servers_lock); |
| 352 | ret = 0; |
| 353 | |
| 354 | afs_put_serverlist(volume->cell->net, discard); |
| 355 | error_vldb: |
| 356 | kfree(vldb); |
| 357 | error: |
| 358 | _leave(" = %d", ret); |
| 359 | return ret; |
| 360 | } |
| 361 | |
| 362 | /* |
| 363 | * Make sure the volume record is up to date. |
| 364 | */ |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 365 | int afs_check_volume_status(struct afs_volume *volume, struct afs_operation *op) |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 366 | { |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 367 | int ret, retries = 0; |
| 368 | |
| 369 | _enter(""); |
| 370 | |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 371 | retry: |
David Howells | f6cbb36 | 2020-04-24 15:10:00 +0100 | [diff] [blame] | 372 | if (test_bit(AFS_VOLUME_WAIT, &volume->flags)) |
| 373 | goto wait; |
| 374 | if (volume->update_at <= ktime_get_real_seconds() || |
| 375 | test_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags)) |
| 376 | goto update; |
| 377 | _leave(" = 0"); |
| 378 | return 0; |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 379 | |
David Howells | f6cbb36 | 2020-04-24 15:10:00 +0100 | [diff] [blame] | 380 | update: |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 381 | if (!test_and_set_bit_lock(AFS_VOLUME_UPDATING, &volume->flags)) { |
David Howells | f6cbb36 | 2020-04-24 15:10:00 +0100 | [diff] [blame] | 382 | clear_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags); |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 383 | ret = afs_update_volume_status(volume, op->key); |
David Howells | f6cbb36 | 2020-04-24 15:10:00 +0100 | [diff] [blame] | 384 | if (ret < 0) |
| 385 | set_bit(AFS_VOLUME_NEEDS_UPDATE, &volume->flags); |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 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); |
| 389 | _leave(" = %d", ret); |
| 390 | return ret; |
| 391 | } |
| 392 | |
David Howells | f6cbb36 | 2020-04-24 15:10:00 +0100 | [diff] [blame] | 393 | wait: |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 394 | if (!test_bit(AFS_VOLUME_WAIT, &volume->flags)) { |
| 395 | _leave(" = 0 [no wait]"); |
| 396 | return 0; |
| 397 | } |
| 398 | |
David Howells | c4bfda1 | 2020-04-16 18:17:13 +0100 | [diff] [blame] | 399 | ret = wait_on_bit(&volume->flags, AFS_VOLUME_WAIT, |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 400 | (op->flags & AFS_OPERATION_UNINTR) ? |
| 401 | TASK_UNINTERRUPTIBLE : TASK_INTERRUPTIBLE); |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 402 | if (ret == -ERESTARTSYS) { |
| 403 | _leave(" = %d", ret); |
| 404 | return ret; |
| 405 | } |
| 406 | |
| 407 | retries++; |
| 408 | if (retries == 4) { |
| 409 | _leave(" = -ESTALE"); |
| 410 | return -ESTALE; |
| 411 | } |
| 412 | goto retry; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 413 | } |