Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 1 | /* |
| 2 | * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net> |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/fs.h> |
| 18 | #include <linux/jhash.h> |
| 19 | #include <linux/namei.h> |
| 20 | #include <linux/pagemap.h> |
| 21 | |
| 22 | #include "netfs.h" |
| 23 | |
| 24 | static int pohmelfs_cmp_hash(struct pohmelfs_name *n, u32 hash) |
| 25 | { |
| 26 | if (n->hash > hash) |
| 27 | return -1; |
| 28 | if (n->hash < hash) |
| 29 | return 1; |
| 30 | |
| 31 | return 0; |
| 32 | } |
| 33 | |
| 34 | static struct pohmelfs_name *pohmelfs_search_hash_unprecise(struct pohmelfs_inode *pi, u32 hash) |
| 35 | { |
| 36 | struct rb_node *n = pi->hash_root.rb_node; |
| 37 | struct pohmelfs_name *tmp = NULL; |
| 38 | int cmp; |
| 39 | |
| 40 | while (n) { |
| 41 | tmp = rb_entry(n, struct pohmelfs_name, hash_node); |
| 42 | |
| 43 | cmp = pohmelfs_cmp_hash(tmp, hash); |
| 44 | if (cmp < 0) |
| 45 | n = n->rb_left; |
| 46 | else if (cmp > 0) |
| 47 | n = n->rb_right; |
| 48 | else |
| 49 | break; |
| 50 | |
| 51 | } |
| 52 | |
| 53 | return tmp; |
| 54 | } |
| 55 | |
| 56 | struct pohmelfs_name *pohmelfs_search_hash(struct pohmelfs_inode *pi, u32 hash) |
| 57 | { |
| 58 | struct pohmelfs_name *tmp; |
| 59 | |
| 60 | tmp = pohmelfs_search_hash_unprecise(pi, hash); |
| 61 | if (tmp && (tmp->hash == hash)) |
| 62 | return tmp; |
| 63 | |
| 64 | return NULL; |
| 65 | } |
| 66 | |
| 67 | static void __pohmelfs_name_del(struct pohmelfs_inode *parent, struct pohmelfs_name *node) |
| 68 | { |
| 69 | rb_erase(&node->hash_node, &parent->hash_root); |
| 70 | } |
| 71 | |
| 72 | /* |
| 73 | * Remove name cache entry from its caches and free it. |
| 74 | */ |
| 75 | static void pohmelfs_name_free(struct pohmelfs_inode *parent, struct pohmelfs_name *node) |
| 76 | { |
| 77 | __pohmelfs_name_del(parent, node); |
| 78 | list_del(&node->sync_create_entry); |
| 79 | kfree(node); |
| 80 | } |
| 81 | |
| 82 | static struct pohmelfs_name *pohmelfs_insert_hash(struct pohmelfs_inode *pi, |
| 83 | struct pohmelfs_name *new) |
| 84 | { |
| 85 | struct rb_node **n = &pi->hash_root.rb_node, *parent = NULL; |
| 86 | struct pohmelfs_name *ret = NULL, *tmp; |
| 87 | int cmp; |
| 88 | |
| 89 | while (*n) { |
| 90 | parent = *n; |
| 91 | |
| 92 | tmp = rb_entry(parent, struct pohmelfs_name, hash_node); |
| 93 | |
| 94 | cmp = pohmelfs_cmp_hash(tmp, new->hash); |
| 95 | if (cmp < 0) |
| 96 | n = &parent->rb_left; |
| 97 | else if (cmp > 0) |
| 98 | n = &parent->rb_right; |
| 99 | else { |
| 100 | ret = tmp; |
| 101 | break; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | if (ret) { |
| 106 | printk("%s: exist: parent: %llu, ino: %llu, hash: %x, len: %u, data: '%s', " |
| 107 | "new: ino: %llu, hash: %x, len: %u, data: '%s'.\n", |
| 108 | __func__, pi->ino, |
| 109 | ret->ino, ret->hash, ret->len, ret->data, |
| 110 | new->ino, new->hash, new->len, new->data); |
| 111 | ret->ino = new->ino; |
| 112 | return ret; |
| 113 | } |
| 114 | |
| 115 | rb_link_node(&new->hash_node, parent, n); |
| 116 | rb_insert_color(&new->hash_node, &pi->hash_root); |
| 117 | |
| 118 | return NULL; |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * Free name cache for given inode. |
| 123 | */ |
| 124 | void pohmelfs_free_names(struct pohmelfs_inode *parent) |
| 125 | { |
| 126 | struct rb_node *rb_node; |
| 127 | struct pohmelfs_name *n; |
| 128 | |
| 129 | for (rb_node = rb_first(&parent->hash_root); rb_node;) { |
| 130 | n = rb_entry(rb_node, struct pohmelfs_name, hash_node); |
| 131 | rb_node = rb_next(rb_node); |
| 132 | |
| 133 | pohmelfs_name_free(parent, n); |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | static void pohmelfs_fix_offset(struct pohmelfs_inode *parent, struct pohmelfs_name *node) |
| 138 | { |
| 139 | parent->total_len -= node->len; |
| 140 | } |
| 141 | |
| 142 | /* |
| 143 | * Free name cache entry helper. |
| 144 | */ |
| 145 | void pohmelfs_name_del(struct pohmelfs_inode *parent, struct pohmelfs_name *node) |
| 146 | { |
| 147 | pohmelfs_fix_offset(parent, node); |
| 148 | pohmelfs_name_free(parent, node); |
| 149 | } |
| 150 | |
| 151 | /* |
| 152 | * Insert new name cache entry into all hash cache. |
| 153 | */ |
| 154 | static int pohmelfs_insert_name(struct pohmelfs_inode *parent, struct pohmelfs_name *n) |
| 155 | { |
| 156 | struct pohmelfs_name *name; |
| 157 | |
| 158 | name = pohmelfs_insert_hash(parent, n); |
| 159 | if (name) |
| 160 | return -EEXIST; |
| 161 | |
| 162 | parent->total_len += n->len; |
| 163 | list_add_tail(&n->sync_create_entry, &parent->sync_create_list); |
| 164 | |
| 165 | return 0; |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * Allocate new name cache entry. |
| 170 | */ |
| 171 | static struct pohmelfs_name *pohmelfs_name_alloc(unsigned int len) |
| 172 | { |
| 173 | struct pohmelfs_name *n; |
| 174 | |
| 175 | n = kzalloc(sizeof(struct pohmelfs_name) + len, GFP_KERNEL); |
| 176 | if (!n) |
| 177 | return NULL; |
| 178 | |
| 179 | INIT_LIST_HEAD(&n->sync_create_entry); |
| 180 | |
| 181 | n->data = (char *)(n+1); |
| 182 | |
| 183 | return n; |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Add new name entry into directory's cache. |
| 188 | */ |
| 189 | static int pohmelfs_add_dir(struct pohmelfs_sb *psb, struct pohmelfs_inode *parent, |
| 190 | struct pohmelfs_inode *npi, struct qstr *str, unsigned int mode, int link) |
| 191 | { |
| 192 | int err = -ENOMEM; |
| 193 | struct pohmelfs_name *n; |
| 194 | |
| 195 | n = pohmelfs_name_alloc(str->len + 1); |
| 196 | if (!n) |
| 197 | goto err_out_exit; |
| 198 | |
| 199 | n->ino = npi->ino; |
| 200 | n->mode = mode; |
| 201 | n->len = str->len; |
| 202 | n->hash = str->hash; |
| 203 | sprintf(n->data, "%s", str->name); |
| 204 | |
| 205 | mutex_lock(&parent->offset_lock); |
| 206 | err = pohmelfs_insert_name(parent, n); |
| 207 | mutex_unlock(&parent->offset_lock); |
| 208 | |
| 209 | if (err) { |
| 210 | if (err != -EEXIST) |
| 211 | goto err_out_free; |
| 212 | kfree(n); |
| 213 | } |
| 214 | |
| 215 | return 0; |
| 216 | |
| 217 | err_out_free: |
| 218 | kfree(n); |
| 219 | err_out_exit: |
| 220 | return err; |
| 221 | } |
| 222 | |
| 223 | /* |
| 224 | * Create new inode for given parameters (name, inode info, parent). |
| 225 | * This does not create object on the server, it will be synced there during writeback. |
| 226 | */ |
| 227 | struct pohmelfs_inode *pohmelfs_new_inode(struct pohmelfs_sb *psb, |
| 228 | struct pohmelfs_inode *parent, struct qstr *str, |
| 229 | struct netfs_inode_info *info, int link) |
| 230 | { |
| 231 | struct inode *new = NULL; |
| 232 | struct pohmelfs_inode *npi; |
| 233 | int err = -EEXIST; |
| 234 | |
| 235 | dprintk("%s: creating inode: parent: %llu, ino: %llu, str: %p.\n", |
| 236 | __func__, (parent)?parent->ino:0, info->ino, str); |
| 237 | |
| 238 | err = -ENOMEM; |
| 239 | new = iget_locked(psb->sb, info->ino); |
| 240 | if (!new) |
| 241 | goto err_out_exit; |
| 242 | |
| 243 | npi = POHMELFS_I(new); |
| 244 | npi->ino = info->ino; |
| 245 | err = 0; |
| 246 | |
| 247 | if (new->i_state & I_NEW) { |
| 248 | dprintk("%s: filling VFS inode: %lu/%llu.\n", |
| 249 | __func__, new->i_ino, info->ino); |
| 250 | pohmelfs_fill_inode(new, info); |
| 251 | |
| 252 | if (S_ISDIR(info->mode)) { |
| 253 | struct qstr s; |
| 254 | |
| 255 | s.name = "."; |
| 256 | s.len = 1; |
| 257 | s.hash = jhash(s.name, s.len, 0); |
| 258 | |
| 259 | err = pohmelfs_add_dir(psb, npi, npi, &s, info->mode, 0); |
| 260 | if (err) |
| 261 | goto err_out_put; |
| 262 | |
| 263 | s.name = ".."; |
| 264 | s.len = 2; |
| 265 | s.hash = jhash(s.name, s.len, 0); |
| 266 | |
| 267 | err = pohmelfs_add_dir(psb, npi, (parent)?parent:npi, &s, |
| 268 | (parent)?parent->vfs_inode.i_mode:npi->vfs_inode.i_mode, 0); |
| 269 | if (err) |
| 270 | goto err_out_put; |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | if (str) { |
| 275 | if (parent) { |
| 276 | err = pohmelfs_add_dir(psb, parent, npi, str, info->mode, link); |
| 277 | |
| 278 | dprintk("%s: %s inserted name: '%s', new_offset: %llu, ino: %llu, parent: %llu.\n", |
| 279 | __func__, (err)?"unsuccessfully":"successfully", |
| 280 | str->name, parent->total_len, info->ino, parent->ino); |
| 281 | |
| 282 | if (err && err != -EEXIST) |
| 283 | goto err_out_put; |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | if (new->i_state & I_NEW) { |
| 288 | if (parent) |
| 289 | mark_inode_dirty(&parent->vfs_inode); |
| 290 | mark_inode_dirty(new); |
| 291 | } |
| 292 | |
| 293 | set_bit(NETFS_INODE_OWNED, &npi->state); |
| 294 | npi->lock_type = POHMELFS_WRITE_LOCK; |
| 295 | unlock_new_inode(new); |
| 296 | |
| 297 | return npi; |
| 298 | |
| 299 | err_out_put: |
| 300 | printk("%s: putting inode: %p, npi: %p, error: %d.\n", __func__, new, npi, err); |
| 301 | iput(new); |
| 302 | err_out_exit: |
| 303 | return ERR_PTR(err); |
| 304 | } |
| 305 | |
| 306 | static int pohmelfs_remote_sync_complete(struct page **pages, unsigned int page_num, |
| 307 | void *private, int err) |
| 308 | { |
| 309 | struct pohmelfs_inode *pi = private; |
| 310 | struct pohmelfs_sb *psb = POHMELFS_SB(pi->vfs_inode.i_sb); |
| 311 | |
| 312 | dprintk("%s: ino: %llu, err: %d.\n", __func__, pi->ino, err); |
| 313 | |
| 314 | if (err) |
| 315 | pi->error = err; |
| 316 | wake_up(&psb->wait); |
| 317 | pohmelfs_put_inode(pi); |
| 318 | |
| 319 | return err; |
| 320 | } |
| 321 | |
| 322 | /* |
| 323 | * Receive directory content from the server. |
| 324 | * This should be only done for objects, which were not created locally, |
| 325 | * and which were not synced previously. |
| 326 | */ |
| 327 | static int pohmelfs_sync_remote_dir(struct pohmelfs_inode *pi) |
| 328 | { |
| 329 | struct inode *inode = &pi->vfs_inode; |
| 330 | struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb); |
Evgeniy Polyakov | b82ba78 | 2009-03-27 15:04:26 +0300 | [diff] [blame] | 331 | long ret = psb->wait_on_page_timeout; |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 332 | int err; |
| 333 | |
| 334 | dprintk("%s: dir: %llu, state: %lx: remote_synced: %d.\n", |
| 335 | __func__, pi->ino, pi->state, test_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state)); |
| 336 | |
| 337 | if (test_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &pi->state)) |
| 338 | return 0; |
| 339 | |
| 340 | if (!igrab(inode)) { |
| 341 | err = -ENOENT; |
| 342 | goto err_out_exit; |
| 343 | } |
| 344 | |
| 345 | err = pohmelfs_meta_command(pi, NETFS_READDIR, NETFS_TRANS_SINGLE_DST, |
| 346 | pohmelfs_remote_sync_complete, pi, 0); |
| 347 | if (err) |
| 348 | goto err_out_exit; |
| 349 | |
| 350 | pi->error = 0; |
| 351 | ret = wait_event_interruptible_timeout(psb->wait, |
| 352 | test_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &pi->state) || pi->error, ret); |
| 353 | dprintk("%s: awake dir: %llu, ret: %ld, err: %d.\n", __func__, pi->ino, ret, pi->error); |
| 354 | if (ret <= 0) { |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 355 | err = ret; |
| 356 | if (!err) |
| 357 | err = -ETIMEDOUT; |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 358 | goto err_out_exit; |
| 359 | } |
| 360 | |
| 361 | if (pi->error) |
| 362 | return pi->error; |
| 363 | |
| 364 | return 0; |
| 365 | |
| 366 | err_out_exit: |
| 367 | clear_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state); |
| 368 | |
| 369 | return err; |
| 370 | } |
| 371 | |
| 372 | static int pohmelfs_dir_open(struct inode *inode, struct file *file) |
| 373 | { |
| 374 | file->private_data = NULL; |
| 375 | return 0; |
| 376 | } |
| 377 | |
| 378 | /* |
| 379 | * VFS readdir callback. Syncs directory content from server if needed, |
| 380 | * and provides direntry info to the userspace. |
| 381 | */ |
| 382 | static int pohmelfs_readdir(struct file *file, void *dirent, filldir_t filldir) |
| 383 | { |
| 384 | struct inode *inode = file->f_path.dentry->d_inode; |
| 385 | struct pohmelfs_inode *pi = POHMELFS_I(inode); |
| 386 | struct pohmelfs_name *n; |
| 387 | struct rb_node *rb_node; |
| 388 | int err = 0, mode; |
| 389 | u64 len; |
| 390 | |
| 391 | dprintk("%s: parent: %llu, fpos: %llu, hash: %08lx.\n", |
| 392 | __func__, pi->ino, (u64)file->f_pos, |
| 393 | (unsigned long)file->private_data); |
Evgeniy Polyakov | f3b8fa7 | 2009-03-27 15:04:19 +0300 | [diff] [blame] | 394 | #if 0 |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 395 | err = pohmelfs_data_lock(pi, 0, ~0, POHMELFS_READ_LOCK); |
| 396 | if (err) |
| 397 | return err; |
Evgeniy Polyakov | f3b8fa7 | 2009-03-27 15:04:19 +0300 | [diff] [blame] | 398 | #endif |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 399 | err = pohmelfs_sync_remote_dir(pi); |
| 400 | if (err) |
| 401 | return err; |
| 402 | |
| 403 | if (file->private_data && (file->private_data == (void *)(unsigned long)file->f_pos)) |
| 404 | return 0; |
| 405 | |
| 406 | mutex_lock(&pi->offset_lock); |
| 407 | n = pohmelfs_search_hash_unprecise(pi, (unsigned long)file->private_data); |
| 408 | |
| 409 | while (n) { |
| 410 | mode = (n->mode >> 12) & 15; |
| 411 | |
| 412 | dprintk("%s: offset: %llu, parent ino: %llu, name: '%s', len: %u, ino: %llu, " |
| 413 | "mode: %o/%o, fpos: %llu, hash: %08x.\n", |
| 414 | __func__, file->f_pos, pi->ino, n->data, n->len, |
| 415 | n->ino, n->mode, mode, file->f_pos, n->hash); |
| 416 | |
Alan Cox | 106a47b | 2009-08-19 17:52:08 +0100 | [diff] [blame] | 417 | file->private_data = (void *)(unsigned long)n->hash; |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 418 | |
| 419 | len = n->len; |
| 420 | err = filldir(dirent, n->data, n->len, file->f_pos, n->ino, mode); |
| 421 | |
| 422 | if (err < 0) { |
| 423 | dprintk("%s: err: %d.\n", __func__, err); |
| 424 | err = 0; |
| 425 | break; |
| 426 | } |
| 427 | |
| 428 | file->f_pos += len; |
| 429 | |
| 430 | rb_node = rb_next(&n->hash_node); |
| 431 | |
| 432 | if (!rb_node || (rb_node == &n->hash_node)) { |
| 433 | file->private_data = (void *)(unsigned long)file->f_pos; |
| 434 | break; |
| 435 | } |
| 436 | |
| 437 | n = rb_entry(rb_node, struct pohmelfs_name, hash_node); |
| 438 | } |
| 439 | mutex_unlock(&pi->offset_lock); |
| 440 | |
| 441 | return err; |
| 442 | } |
| 443 | |
| 444 | static loff_t pohmelfs_dir_lseek(struct file *file, loff_t offset, int origin) |
| 445 | { |
| 446 | file->f_pos = offset; |
| 447 | file->private_data = NULL; |
| 448 | return offset; |
| 449 | } |
| 450 | |
| 451 | const struct file_operations pohmelfs_dir_fops = { |
| 452 | .open = pohmelfs_dir_open, |
| 453 | .read = generic_read_dir, |
| 454 | .llseek = pohmelfs_dir_lseek, |
| 455 | .readdir = pohmelfs_readdir, |
| 456 | }; |
| 457 | |
| 458 | /* |
| 459 | * Lookup single object on server. |
| 460 | */ |
| 461 | static int pohmelfs_lookup_single(struct pohmelfs_inode *parent, |
| 462 | struct qstr *str, u64 ino) |
| 463 | { |
| 464 | struct pohmelfs_sb *psb = POHMELFS_SB(parent->vfs_inode.i_sb); |
| 465 | long ret = msecs_to_jiffies(5000); |
| 466 | int err; |
| 467 | |
| 468 | set_bit(NETFS_COMMAND_PENDING, &parent->state); |
| 469 | err = pohmelfs_meta_command_data(parent, parent->ino, NETFS_LOOKUP, |
| 470 | (char *)str->name, NETFS_TRANS_SINGLE_DST, NULL, NULL, ino); |
| 471 | if (err) |
| 472 | goto err_out_exit; |
| 473 | |
| 474 | err = 0; |
| 475 | ret = wait_event_interruptible_timeout(psb->wait, |
| 476 | !test_bit(NETFS_COMMAND_PENDING, &parent->state), ret); |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 477 | if (ret <= 0) { |
| 478 | err = ret; |
| 479 | if (!err) |
| 480 | err = -ETIMEDOUT; |
| 481 | } |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 482 | |
| 483 | if (err) |
| 484 | goto err_out_exit; |
| 485 | |
| 486 | return 0; |
| 487 | |
| 488 | err_out_exit: |
| 489 | clear_bit(NETFS_COMMAND_PENDING, &parent->state); |
| 490 | |
| 491 | printk("%s: failed: parent: %llu, ino: %llu, name: '%s', err: %d.\n", |
| 492 | __func__, parent->ino, ino, str->name, err); |
| 493 | |
| 494 | return err; |
| 495 | } |
| 496 | |
| 497 | /* |
| 498 | * VFS lookup callback. |
| 499 | * We first try to get inode number from local name cache, if we have one, |
| 500 | * then inode can be found in inode cache. If there is no inode or no object in |
| 501 | * local cache, try to lookup it on server. This only should be done for directories, |
| 502 | * which were not created locally, otherwise remote server does not know about dir at all, |
| 503 | * so no need to try to know that. |
| 504 | */ |
| 505 | struct dentry *pohmelfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
| 506 | { |
| 507 | struct pohmelfs_inode *parent = POHMELFS_I(dir); |
| 508 | struct pohmelfs_name *n; |
| 509 | struct inode *inode = NULL; |
| 510 | unsigned long ino = 0; |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 511 | int err, lock_type = POHMELFS_READ_LOCK, need_lock = 1; |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 512 | struct qstr str = dentry->d_name; |
| 513 | |
| 514 | if ((nd->intent.open.flags & O_ACCMODE) > 1) |
| 515 | lock_type = POHMELFS_WRITE_LOCK; |
| 516 | |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 517 | if (test_bit(NETFS_INODE_OWNED, &parent->state)) { |
| 518 | if (lock_type == parent->lock_type) |
| 519 | need_lock = 0; |
| 520 | if ((lock_type == POHMELFS_READ_LOCK) && (parent->lock_type == POHMELFS_WRITE_LOCK)) |
| 521 | need_lock = 0; |
| 522 | } |
| 523 | |
| 524 | if ((lock_type == POHMELFS_READ_LOCK) && !test_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &parent->state)) |
| 525 | need_lock = 1; |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 526 | |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 527 | str.hash = jhash(dentry->d_name.name, dentry->d_name.len, 0); |
| 528 | |
| 529 | mutex_lock(&parent->offset_lock); |
| 530 | n = pohmelfs_search_hash(parent, str.hash); |
| 531 | if (n) |
| 532 | ino = n->ino; |
| 533 | mutex_unlock(&parent->offset_lock); |
| 534 | |
Evgeniy Polyakov | b522efd | 2009-03-27 15:04:21 +0300 | [diff] [blame] | 535 | dprintk("%s: start ino: %lu, inode: %p, name: '%s', hash: %x, parent_state: %lx, need_lock: %d.\n", |
| 536 | __func__, ino, inode, str.name, str.hash, parent->state, need_lock); |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 537 | |
| 538 | if (ino) { |
| 539 | inode = ilookup(dir->i_sb, ino); |
| 540 | if (inode) |
| 541 | goto out; |
| 542 | } |
| 543 | |
Evgeniy Polyakov | f3b8fa7 | 2009-03-27 15:04:19 +0300 | [diff] [blame] | 544 | dprintk("%s: no inode dir: %p, dir_ino: %llu, name: '%s', len: %u, dir_state: %lx, ino: %lu.\n", |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 545 | __func__, dir, parent->ino, |
| 546 | str.name, str.len, parent->state, ino); |
| 547 | |
| 548 | if (!ino) { |
| 549 | if (!need_lock) |
| 550 | goto out; |
| 551 | } |
| 552 | |
Evgeniy Polyakov | f3b8fa7 | 2009-03-27 15:04:19 +0300 | [diff] [blame] | 553 | err = pohmelfs_data_lock(parent, 0, ~0, lock_type); |
| 554 | if (err) |
| 555 | goto out; |
| 556 | |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 557 | err = pohmelfs_lookup_single(parent, &str, ino); |
| 558 | if (err) |
| 559 | goto out; |
| 560 | |
| 561 | if (!ino) { |
| 562 | mutex_lock(&parent->offset_lock); |
| 563 | n = pohmelfs_search_hash(parent, str.hash); |
| 564 | if (n) |
| 565 | ino = n->ino; |
| 566 | mutex_unlock(&parent->offset_lock); |
| 567 | } |
| 568 | |
| 569 | if (ino) { |
| 570 | inode = ilookup(dir->i_sb, ino); |
Evgeniy Polyakov | d1ec644 | 2009-03-27 15:04:25 +0300 | [diff] [blame] | 571 | dprintk("%s: second lookup ino: %lu, inode: %p, name: '%s', hash: %x.\n", |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 572 | __func__, ino, inode, str.name, str.hash); |
| 573 | if (!inode) { |
Evgeniy Polyakov | d1ec644 | 2009-03-27 15:04:25 +0300 | [diff] [blame] | 574 | dprintk("%s: No inode for ino: %lu, name: '%s', hash: %x.\n", |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 575 | __func__, ino, str.name, str.hash); |
Bill Pemberton | 3bafeab | 2009-04-22 08:59:14 -0400 | [diff] [blame] | 576 | /* return NULL; */ |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 577 | return ERR_PTR(-EACCES); |
| 578 | } |
| 579 | } else { |
| 580 | printk("%s: No inode number : name: '%s', hash: %x.\n", |
| 581 | __func__, str.name, str.hash); |
| 582 | } |
| 583 | out: |
| 584 | return d_splice_alias(inode, dentry); |
| 585 | } |
| 586 | |
| 587 | /* |
| 588 | * Create new object in local cache. Object will be synced to server |
| 589 | * during writeback for given inode. |
| 590 | */ |
| 591 | struct pohmelfs_inode *pohmelfs_create_entry_local(struct pohmelfs_sb *psb, |
| 592 | struct pohmelfs_inode *parent, struct qstr *str, u64 start, int mode) |
| 593 | { |
| 594 | struct pohmelfs_inode *npi; |
| 595 | int err = -ENOMEM; |
| 596 | struct netfs_inode_info info; |
| 597 | |
| 598 | dprintk("%s: name: '%s', mode: %o, start: %llu.\n", |
| 599 | __func__, str->name, mode, start); |
| 600 | |
| 601 | info.mode = mode; |
| 602 | info.ino = start; |
| 603 | |
| 604 | if (!start) |
| 605 | info.ino = pohmelfs_new_ino(psb); |
| 606 | |
| 607 | info.nlink = S_ISDIR(mode)?2:1; |
| 608 | info.uid = current_fsuid(); |
| 609 | info.gid = current_fsgid(); |
| 610 | info.size = 0; |
| 611 | info.blocksize = 512; |
| 612 | info.blocks = 0; |
| 613 | info.rdev = 0; |
| 614 | info.version = 0; |
| 615 | |
| 616 | npi = pohmelfs_new_inode(psb, parent, str, &info, !!start); |
| 617 | if (IS_ERR(npi)) { |
| 618 | err = PTR_ERR(npi); |
| 619 | goto err_out_unlock; |
| 620 | } |
| 621 | |
| 622 | return npi; |
| 623 | |
| 624 | err_out_unlock: |
| 625 | dprintk("%s: err: %d.\n", __func__, err); |
| 626 | return ERR_PTR(err); |
| 627 | } |
| 628 | |
| 629 | /* |
| 630 | * Create local object and bind it to dentry. |
| 631 | */ |
| 632 | static int pohmelfs_create_entry(struct inode *dir, struct dentry *dentry, u64 start, int mode) |
| 633 | { |
| 634 | struct pohmelfs_sb *psb = POHMELFS_SB(dir->i_sb); |
| 635 | struct pohmelfs_inode *npi, *parent; |
| 636 | struct qstr str = dentry->d_name; |
| 637 | int err; |
| 638 | |
| 639 | parent = POHMELFS_I(dir); |
| 640 | |
| 641 | err = pohmelfs_data_lock(parent, 0, ~0, POHMELFS_WRITE_LOCK); |
| 642 | if (err) |
| 643 | return err; |
| 644 | |
| 645 | str.hash = jhash(dentry->d_name.name, dentry->d_name.len, 0); |
| 646 | |
| 647 | npi = pohmelfs_create_entry_local(psb, parent, &str, start, mode); |
| 648 | if (IS_ERR(npi)) |
| 649 | return PTR_ERR(npi); |
| 650 | |
| 651 | d_instantiate(dentry, &npi->vfs_inode); |
| 652 | |
| 653 | dprintk("%s: parent: %llu, inode: %llu, name: '%s', parent_nlink: %d, nlink: %d.\n", |
| 654 | __func__, parent->ino, npi->ino, dentry->d_name.name, |
| 655 | (signed)dir->i_nlink, (signed)npi->vfs_inode.i_nlink); |
| 656 | |
| 657 | return 0; |
| 658 | } |
| 659 | |
| 660 | /* |
| 661 | * VFS create and mkdir callbacks. |
| 662 | */ |
| 663 | static int pohmelfs_create(struct inode *dir, struct dentry *dentry, int mode, |
| 664 | struct nameidata *nd) |
| 665 | { |
| 666 | return pohmelfs_create_entry(dir, dentry, 0, mode); |
| 667 | } |
| 668 | |
| 669 | static int pohmelfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 670 | { |
| 671 | int err; |
| 672 | |
| 673 | inode_inc_link_count(dir); |
| 674 | err = pohmelfs_create_entry(dir, dentry, 0, mode | S_IFDIR); |
| 675 | if (err) |
| 676 | inode_dec_link_count(dir); |
| 677 | |
| 678 | return err; |
| 679 | } |
| 680 | |
| 681 | static int pohmelfs_remove_entry(struct inode *dir, struct dentry *dentry) |
| 682 | { |
| 683 | struct pohmelfs_sb *psb = POHMELFS_SB(dir->i_sb); |
| 684 | struct inode *inode = dentry->d_inode; |
| 685 | struct pohmelfs_inode *parent = POHMELFS_I(dir), *pi = POHMELFS_I(inode); |
| 686 | struct pohmelfs_name *n; |
| 687 | int err = -ENOENT; |
| 688 | struct qstr str = dentry->d_name; |
| 689 | |
| 690 | err = pohmelfs_data_lock(parent, 0, ~0, POHMELFS_WRITE_LOCK); |
| 691 | if (err) |
| 692 | return err; |
| 693 | |
| 694 | str.hash = jhash(dentry->d_name.name, dentry->d_name.len, 0); |
| 695 | |
| 696 | dprintk("%s: dir_ino: %llu, inode: %llu, name: '%s', nlink: %d.\n", |
| 697 | __func__, parent->ino, pi->ino, |
| 698 | str.name, (signed)inode->i_nlink); |
| 699 | |
| 700 | BUG_ON(!inode); |
| 701 | |
| 702 | mutex_lock(&parent->offset_lock); |
| 703 | n = pohmelfs_search_hash(parent, str.hash); |
| 704 | if (n) { |
| 705 | pohmelfs_fix_offset(parent, n); |
Bill Pemberton | dc82846 | 2009-04-22 08:59:15 -0400 | [diff] [blame] | 706 | if (test_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state)) |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 707 | pohmelfs_remove_child(pi, n); |
Bill Pemberton | dc82846 | 2009-04-22 08:59:15 -0400 | [diff] [blame] | 708 | |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 709 | pohmelfs_name_free(parent, n); |
| 710 | err = 0; |
| 711 | } |
| 712 | mutex_unlock(&parent->offset_lock); |
| 713 | |
| 714 | if (!err) { |
| 715 | psb->avail_size += inode->i_size; |
| 716 | |
| 717 | pohmelfs_inode_del_inode(psb, pi); |
| 718 | |
| 719 | mark_inode_dirty(dir); |
| 720 | |
| 721 | inode->i_ctime = dir->i_ctime; |
| 722 | if (inode->i_nlink) |
| 723 | inode_dec_link_count(inode); |
| 724 | } |
| 725 | dprintk("%s: inode: %p, lock: %ld, unhashed: %d.\n", |
| 726 | __func__, pi, inode->i_state & I_LOCK, hlist_unhashed(&inode->i_hash)); |
| 727 | |
| 728 | return err; |
| 729 | } |
| 730 | |
| 731 | /* |
| 732 | * Unlink and rmdir VFS callbacks. |
| 733 | */ |
| 734 | static int pohmelfs_unlink(struct inode *dir, struct dentry *dentry) |
| 735 | { |
| 736 | return pohmelfs_remove_entry(dir, dentry); |
| 737 | } |
| 738 | |
| 739 | static int pohmelfs_rmdir(struct inode *dir, struct dentry *dentry) |
| 740 | { |
| 741 | int err; |
| 742 | struct inode *inode = dentry->d_inode; |
| 743 | |
| 744 | dprintk("%s: parent: %llu, inode: %llu, name: '%s', parent_nlink: %d, nlink: %d.\n", |
| 745 | __func__, POHMELFS_I(dir)->ino, POHMELFS_I(inode)->ino, |
| 746 | dentry->d_name.name, (signed)dir->i_nlink, (signed)inode->i_nlink); |
| 747 | |
| 748 | err = pohmelfs_remove_entry(dir, dentry); |
| 749 | if (!err) { |
| 750 | inode_dec_link_count(dir); |
| 751 | inode_dec_link_count(inode); |
| 752 | } |
| 753 | |
| 754 | return err; |
| 755 | } |
| 756 | |
| 757 | /* |
| 758 | * Link creation is synchronous. |
| 759 | * I'm lazy. |
| 760 | * Earth is somewhat round. |
| 761 | */ |
| 762 | static int pohmelfs_create_link(struct pohmelfs_inode *parent, struct qstr *obj, |
| 763 | struct pohmelfs_inode *target, struct qstr *tstr) |
| 764 | { |
| 765 | struct super_block *sb = parent->vfs_inode.i_sb; |
| 766 | struct pohmelfs_sb *psb = POHMELFS_SB(sb); |
| 767 | struct netfs_cmd *cmd; |
| 768 | struct netfs_trans *t; |
| 769 | void *data; |
| 770 | int err, parent_len, target_len = 0, cur_len, path_size = 0; |
| 771 | |
| 772 | err = pohmelfs_data_lock(parent, 0, ~0, POHMELFS_WRITE_LOCK); |
| 773 | if (err) |
| 774 | return err; |
| 775 | |
| 776 | err = sb->s_op->write_inode(&parent->vfs_inode, 0); |
| 777 | if (err) |
| 778 | goto err_out_exit; |
| 779 | |
| 780 | if (tstr) |
| 781 | target_len = tstr->len; |
| 782 | |
| 783 | parent_len = pohmelfs_path_length(parent); |
| 784 | if (target) |
| 785 | target_len += pohmelfs_path_length(target); |
| 786 | |
| 787 | if (parent_len < 0) { |
| 788 | err = parent_len; |
| 789 | goto err_out_exit; |
| 790 | } |
| 791 | |
| 792 | if (target_len < 0) { |
| 793 | err = target_len; |
| 794 | goto err_out_exit; |
| 795 | } |
| 796 | |
| 797 | t = netfs_trans_alloc(psb, parent_len + target_len + obj->len + 2, 0, 0); |
| 798 | if (!t) { |
| 799 | err = -ENOMEM; |
| 800 | goto err_out_exit; |
| 801 | } |
| 802 | cur_len = netfs_trans_cur_len(t); |
| 803 | |
| 804 | cmd = netfs_trans_current(t); |
| 805 | if (IS_ERR(cmd)) { |
| 806 | err = PTR_ERR(cmd); |
| 807 | goto err_out_free; |
| 808 | } |
| 809 | |
| 810 | data = (void *)(cmd + 1); |
| 811 | cur_len -= sizeof(struct netfs_cmd); |
| 812 | |
| 813 | err = pohmelfs_construct_path_string(parent, data, parent_len); |
| 814 | if (err > 0) { |
| 815 | /* Do not place null-byte before the slash */ |
| 816 | path_size = err - 1; |
| 817 | cur_len -= path_size; |
| 818 | |
| 819 | err = snprintf(data + path_size, cur_len, "/%s|", obj->name); |
| 820 | |
| 821 | path_size += err; |
| 822 | cur_len -= err; |
| 823 | |
| 824 | cmd->ext = path_size - 1; /* No | symbol */ |
| 825 | |
| 826 | if (target) { |
| 827 | err = pohmelfs_construct_path_string(target, data + path_size, target_len); |
| 828 | if (err > 0) { |
| 829 | path_size += err; |
| 830 | cur_len -= err; |
| 831 | } |
| 832 | } |
| 833 | } |
| 834 | |
| 835 | if (err < 0) |
| 836 | goto err_out_free; |
| 837 | |
| 838 | cmd->start = 0; |
| 839 | |
| 840 | if (!target && tstr) { |
| 841 | if (tstr->len > cur_len - 1) { |
| 842 | err = -ENAMETOOLONG; |
| 843 | goto err_out_free; |
| 844 | } |
| 845 | |
| 846 | err = snprintf(data + path_size, cur_len, "%s", tstr->name) + 1; /* 0-byte */ |
| 847 | path_size += err; |
| 848 | cur_len -= err; |
| 849 | cmd->start = 1; |
| 850 | } |
| 851 | |
| 852 | dprintk("%s: parent: %llu, obj: '%s', target_inode: %llu, target_str: '%s', full: '%s'.\n", |
| 853 | __func__, parent->ino, obj->name, (target)?target->ino:0, (tstr)?tstr->name:NULL, |
| 854 | (char *)data); |
| 855 | |
| 856 | cmd->cmd = NETFS_LINK; |
| 857 | cmd->size = path_size; |
| 858 | cmd->id = parent->ino; |
| 859 | |
| 860 | netfs_convert_cmd(cmd); |
| 861 | |
| 862 | netfs_trans_update(cmd, t, path_size); |
| 863 | |
| 864 | err = netfs_trans_finish(t, psb); |
| 865 | if (err) |
| 866 | goto err_out_exit; |
| 867 | |
| 868 | return 0; |
| 869 | |
| 870 | err_out_free: |
| 871 | t->result = err; |
| 872 | netfs_trans_put(t); |
| 873 | err_out_exit: |
| 874 | return err; |
| 875 | } |
| 876 | |
| 877 | /* |
| 878 | * VFS hard and soft link callbacks. |
| 879 | */ |
| 880 | static int pohmelfs_link(struct dentry *old_dentry, struct inode *dir, |
| 881 | struct dentry *dentry) |
| 882 | { |
| 883 | struct inode *inode = old_dentry->d_inode; |
| 884 | struct pohmelfs_inode *pi = POHMELFS_I(inode); |
| 885 | int err; |
| 886 | struct qstr str = dentry->d_name; |
| 887 | |
| 888 | str.hash = jhash(dentry->d_name.name, dentry->d_name.len, 0); |
| 889 | |
| 890 | err = inode->i_sb->s_op->write_inode(inode, 0); |
| 891 | if (err) |
| 892 | return err; |
| 893 | |
| 894 | err = pohmelfs_create_link(POHMELFS_I(dir), &str, pi, NULL); |
| 895 | if (err) |
| 896 | return err; |
| 897 | |
| 898 | return pohmelfs_create_entry(dir, dentry, pi->ino, inode->i_mode); |
| 899 | } |
| 900 | |
| 901 | static int pohmelfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
| 902 | { |
| 903 | struct qstr sym_str; |
| 904 | struct qstr str = dentry->d_name; |
| 905 | struct inode *inode; |
| 906 | int err; |
| 907 | |
| 908 | str.hash = jhash(dentry->d_name.name, dentry->d_name.len, 0); |
| 909 | |
| 910 | sym_str.name = symname; |
| 911 | sym_str.len = strlen(symname); |
| 912 | |
| 913 | err = pohmelfs_create_link(POHMELFS_I(dir), &str, NULL, &sym_str); |
| 914 | if (err) |
| 915 | goto err_out_exit; |
| 916 | |
| 917 | err = pohmelfs_create_entry(dir, dentry, 0, S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO); |
| 918 | if (err) |
| 919 | goto err_out_exit; |
| 920 | |
| 921 | inode = dentry->d_inode; |
| 922 | |
| 923 | err = page_symlink(inode, symname, sym_str.len + 1); |
| 924 | if (err) |
| 925 | goto err_out_put; |
| 926 | |
| 927 | return 0; |
| 928 | |
| 929 | err_out_put: |
| 930 | iput(inode); |
| 931 | err_out_exit: |
| 932 | return err; |
| 933 | } |
| 934 | |
| 935 | static int pohmelfs_send_rename(struct pohmelfs_inode *pi, struct pohmelfs_inode *parent, |
| 936 | struct qstr *str) |
| 937 | { |
| 938 | int path_len, err, total_len = 0, inode_len, parent_len; |
| 939 | char *path; |
| 940 | struct netfs_trans *t; |
| 941 | struct netfs_cmd *cmd; |
| 942 | struct pohmelfs_sb *psb = POHMELFS_SB(pi->vfs_inode.i_sb); |
| 943 | |
| 944 | parent_len = pohmelfs_path_length(parent); |
| 945 | inode_len = pohmelfs_path_length(pi); |
| 946 | |
| 947 | if (parent_len < 0 || inode_len < 0) |
| 948 | return -EINVAL; |
| 949 | |
| 950 | path_len = parent_len + inode_len + str->len + 3; |
| 951 | |
| 952 | t = netfs_trans_alloc(psb, path_len, 0, 0); |
| 953 | if (!t) |
| 954 | return -ENOMEM; |
| 955 | |
| 956 | cmd = netfs_trans_current(t); |
| 957 | path = (char *)(cmd + 1); |
| 958 | |
| 959 | err = pohmelfs_construct_path_string(pi, path, inode_len); |
| 960 | if (err < 0) |
| 961 | goto err_out_unlock; |
| 962 | |
| 963 | cmd->ext = err; |
| 964 | |
| 965 | path += err; |
| 966 | total_len += err; |
| 967 | path_len -= err; |
| 968 | |
| 969 | *path = '|'; |
| 970 | path++; |
| 971 | total_len++; |
| 972 | path_len--; |
| 973 | |
| 974 | err = pohmelfs_construct_path_string(parent, path, parent_len); |
| 975 | if (err < 0) |
| 976 | goto err_out_unlock; |
| 977 | |
| 978 | /* |
| 979 | * Do not place a null-byte before the final slash and the name. |
| 980 | */ |
| 981 | err--; |
| 982 | path += err; |
| 983 | total_len += err; |
| 984 | path_len -= err; |
| 985 | |
| 986 | err = snprintf(path, path_len - 1, "/%s", str->name); |
| 987 | |
| 988 | total_len += err + 1; /* 0 symbol */ |
| 989 | path_len -= err + 1; |
| 990 | |
| 991 | cmd->cmd = NETFS_RENAME; |
| 992 | cmd->id = pi->ino; |
| 993 | cmd->start = parent->ino; |
| 994 | cmd->size = total_len; |
| 995 | |
| 996 | netfs_convert_cmd(cmd); |
| 997 | |
| 998 | netfs_trans_update(cmd, t, total_len); |
| 999 | |
| 1000 | return netfs_trans_finish(t, psb); |
| 1001 | |
| 1002 | err_out_unlock: |
| 1003 | netfs_trans_free(t); |
| 1004 | return err; |
| 1005 | } |
| 1006 | |
| 1007 | static int pohmelfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 1008 | struct inode *new_dir, struct dentry *new_dentry) |
| 1009 | { |
| 1010 | struct inode *inode = old_dentry->d_inode; |
| 1011 | struct pohmelfs_inode *old_parent, *pi, *new_parent; |
| 1012 | struct qstr str = new_dentry->d_name; |
| 1013 | struct pohmelfs_name *n; |
| 1014 | unsigned int old_hash; |
| 1015 | int err = -ENOENT; |
| 1016 | |
| 1017 | pi = POHMELFS_I(inode); |
| 1018 | old_parent = POHMELFS_I(old_dir); |
| 1019 | |
Bill Pemberton | dc82846 | 2009-04-22 08:59:15 -0400 | [diff] [blame] | 1020 | if (new_dir) |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 1021 | new_dir->i_sb->s_op->write_inode(new_dir, 0); |
Evgeniy Polyakov | e3eec94 | 2009-02-09 17:02:37 +0300 | [diff] [blame] | 1022 | |
| 1023 | old_hash = jhash(old_dentry->d_name.name, old_dentry->d_name.len, 0); |
| 1024 | str.hash = jhash(new_dentry->d_name.name, new_dentry->d_name.len, 0); |
| 1025 | |
| 1026 | str.len = new_dentry->d_name.len; |
| 1027 | str.name = new_dentry->d_name.name; |
| 1028 | str.hash = jhash(new_dentry->d_name.name, new_dentry->d_name.len, 0); |
| 1029 | |
| 1030 | if (new_dir) { |
| 1031 | new_parent = POHMELFS_I(new_dir); |
| 1032 | err = -ENOTEMPTY; |
| 1033 | |
| 1034 | if (S_ISDIR(inode->i_mode) && |
| 1035 | new_parent->total_len <= 3) |
| 1036 | goto err_out_exit; |
| 1037 | } else { |
| 1038 | new_parent = old_parent; |
| 1039 | } |
| 1040 | |
| 1041 | dprintk("%s: ino: %llu, parent: %llu, name: '%s' -> parent: %llu, name: '%s', i_size: %llu.\n", |
| 1042 | __func__, pi->ino, old_parent->ino, old_dentry->d_name.name, |
| 1043 | new_parent->ino, new_dentry->d_name.name, inode->i_size); |
| 1044 | |
| 1045 | if (test_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state) && |
| 1046 | test_bit(NETFS_INODE_OWNED, &pi->state)) { |
| 1047 | err = pohmelfs_send_rename(pi, new_parent, &str); |
| 1048 | if (err) |
| 1049 | goto err_out_exit; |
| 1050 | } |
| 1051 | |
| 1052 | n = pohmelfs_name_alloc(str.len + 1); |
| 1053 | if (!n) |
| 1054 | goto err_out_exit; |
| 1055 | |
| 1056 | mutex_lock(&new_parent->offset_lock); |
| 1057 | n->ino = pi->ino; |
| 1058 | n->mode = inode->i_mode; |
| 1059 | n->len = str.len; |
| 1060 | n->hash = str.hash; |
| 1061 | sprintf(n->data, "%s", str.name); |
| 1062 | |
| 1063 | err = pohmelfs_insert_name(new_parent, n); |
| 1064 | mutex_unlock(&new_parent->offset_lock); |
| 1065 | |
| 1066 | if (err) |
| 1067 | goto err_out_exit; |
| 1068 | |
| 1069 | mutex_lock(&old_parent->offset_lock); |
| 1070 | n = pohmelfs_search_hash(old_parent, old_hash); |
| 1071 | if (n) |
| 1072 | pohmelfs_name_del(old_parent, n); |
| 1073 | mutex_unlock(&old_parent->offset_lock); |
| 1074 | |
| 1075 | mark_inode_dirty(inode); |
| 1076 | mark_inode_dirty(&new_parent->vfs_inode); |
| 1077 | |
| 1078 | WARN_ON_ONCE(list_empty(&inode->i_dentry)); |
| 1079 | |
| 1080 | return 0; |
| 1081 | |
| 1082 | err_out_exit: |
| 1083 | |
| 1084 | clear_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state); |
| 1085 | |
| 1086 | mutex_unlock(&inode->i_mutex); |
| 1087 | return err; |
| 1088 | } |
| 1089 | |
| 1090 | /* |
| 1091 | * POHMELFS directory inode operations. |
| 1092 | */ |
| 1093 | const struct inode_operations pohmelfs_dir_inode_ops = { |
| 1094 | .link = pohmelfs_link, |
| 1095 | .symlink = pohmelfs_symlink, |
| 1096 | .unlink = pohmelfs_unlink, |
| 1097 | .mkdir = pohmelfs_mkdir, |
| 1098 | .rmdir = pohmelfs_rmdir, |
| 1099 | .create = pohmelfs_create, |
| 1100 | .lookup = pohmelfs_lookup, |
| 1101 | .setattr = pohmelfs_setattr, |
| 1102 | .rename = pohmelfs_rename, |
| 1103 | }; |