data/src/cfs-plug-memdb.c

   1 /*
   2   Copyright (C) 2010 Proxmox Server Solutions GmbH
   3
   4   This program is free software: you can redistribute it and/or modify
   5   it under the terms of the GNU Affero General Public License as published by
   6   the Free Software Foundation, either version 3 of the License, or
   7   (at your option) any later version.
   8
   9   This program is distributed in the hope that it will be useful,
  10   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12   GNU Affero General Public License for more details.
  13
  14   You should have received a copy of the GNU Affero General Public License
  15   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17   Author: Dietmar Maurer <dietmar@proxmox.com>
  18
  19 */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include <config.h>
  23 #endif /* HAVE_CONFIG_H */
  24
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29 #include <glib.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <sys/file.h>
  33 #include <fcntl.h>
  34 #include <errno.h>
  35 #include <dirent.h>
  36 #include <arpa/inet.h>
  37
  38 #include "cfs-utils.h"
  39 #include "cfs-plug-memdb.h"
  40 #include "dcdb.h"
  41 #include "status.h"
  42
  43 static struct cfs_operations cfs_ops;
  44
  45 static void tree_entry_stat(memdb_tree_entry_t *te, struct stat *stbuf, gboolean quorate)
  46 {
  47         g_return_if_fail(te != NULL);
  48         g_return_if_fail(stbuf != NULL);
  49
  50         if (te->type == DT_DIR) {
  51                 stbuf->st_mode = S_IFDIR | (quorate ? 0777 : 0555);
  52                 stbuf->st_nlink = 2;
  53         } else {
  54                 stbuf->st_mode = S_IFREG | (quorate ? 0666 : 0444);
  55                 stbuf->st_nlink = 1;
  56         }
  57
  58         stbuf->st_size = te->size;
  59         stbuf->st_blocks =
  60                 (stbuf->st_size + MEMDB_BLOCKSIZE -1)/MEMDB_BLOCKSIZE;
  61         stbuf->st_atime = te->mtime;
  62         stbuf->st_mtime = te->mtime;
  63         stbuf->st_ctime = te->mtime;
  64 }
  65
  66 static int cfs_plug_memdb_getattr(cfs_plug_t *plug, const char *path, struct stat *stbuf)
  67 {
  68         g_return_val_if_fail(plug != NULL, PARAM_CHECK_ERRNO);
  69         g_return_val_if_fail(plug->ops == &cfs_ops, PARAM_CHECK_ERRNO);
  70         g_return_val_if_fail(path != NULL, PARAM_CHECK_ERRNO);
  71         g_return_val_if_fail(stbuf != NULL, PARAM_CHECK_ERRNO);
  72
  73         memset(stbuf, 0, sizeof(struct stat));
  74
  75         cfs_plug_memdb_t *mdb = (cfs_plug_memdb_t *)plug;
  76
  77         memdb_tree_entry_t *te = memdb_getattr(mdb->memdb, path);
  78
  79         if (te) {
  80                 tree_entry_stat(te, stbuf, cfs_is_quorate());
  81                 g_free(te);
  82                 return 0;
  83         }
  84
  85         return  -ENOENT;
  86 }
  87
  88 static int cfs_plug_memdb_readdir(
  89         cfs_plug_t *plug,
  90         const char *path,
  91         void *buf,
  92         fuse_fill_dir_t filler,
  93         off_t offset,
  94         struct fuse_file_info *fi)
  95 {
  96         (void) offset;
  97         (void) fi;
  98
  99         g_return_val_if_fail(plug != NULL, PARAM_CHECK_ERRNO);
 100         g_return_val_if_fail(plug->ops == &cfs_ops, PARAM_CHECK_ERRNO);
 101         g_return_val_if_fail(path != NULL, PARAM_CHECK_ERRNO);
 102         g_return_val_if_fail(buf != NULL, PARAM_CHECK_ERRNO);
 103         g_return_val_if_fail(filler != NULL, PARAM_CHECK_ERRNO);
 104
 105         cfs_plug_memdb_t *mdb = (cfs_plug_memdb_t *)plug;
 106
 107         GList *dirlist = memdb_readdir(mdb->memdb, path);
 108
 109         if (dirlist) {
 110
 111                 filler(buf, ".", NULL, 0);
 112                 filler(buf, "..", NULL, 0);
 113
 114                 struct stat stbuf;
 115                 memset(&stbuf, 0, sizeof(struct stat));
 116
 117                 GList *l = dirlist;
 118                 while (l) {
 119                         memdb_tree_entry_t *te = (memdb_tree_entry_t *)l->data;
 120
 121                         tree_entry_stat(te, &stbuf, 0);
 122                         filler(buf, te->name, &stbuf, 0);
 123                         l = g_list_next(l);
 124                 }
 125
 126                 memdb_dirlist_free(dirlist);
 127         }
 128
 129         return 0;
 130 }
 131
 132 static int cfs_plug_memdb_open(cfs_plug_t *plug, const char *path, struct fuse_file_info *fi)
 133 {
 134         g_return_val_if_fail(plug != NULL, PARAM_CHECK_ERRNO);
 135         g_return_val_if_fail(plug->ops == &cfs_ops, PARAM_CHECK_ERRNO);
 136         g_return_val_if_fail(path != NULL, PARAM_CHECK_ERRNO);
 137         g_return_val_if_fail(fi != NULL, PARAM_CHECK_ERRNO);
 138
 139         memdb_tree_entry_t *te;
 140
 141         cfs_plug_memdb_t *mdb = (cfs_plug_memdb_t *)plug;
 142
 143         if ((te = memdb_getattr(mdb->memdb, path))) {
 144                 g_free(te);
 145         } else
 146                 return -ENOENT;
 147
 148         return 0;
 149 }
 150
 151 static int cfs_plug_memdb_read(
 152         cfs_plug_t *plug,
 153         const char *path,
 154         char *buf,
 155         size_t size,
 156         off_t offset,
 157         struct fuse_file_info *fi)
 158 {
 159         (void) fi;
 160
 161         g_return_val_if_fail(plug != NULL, PARAM_CHECK_ERRNO);
 162         g_return_val_if_fail(plug->ops == &cfs_ops, PARAM_CHECK_ERRNO);
 163         g_return_val_if_fail(path != NULL, PARAM_CHECK_ERRNO);
 164         g_return_val_if_fail(buf != NULL, PARAM_CHECK_ERRNO);
 165
 166         int len;
 167         gpointer data = NULL;
 168
 169         cfs_plug_memdb_t *mdb = (cfs_plug_memdb_t *)plug;
 170
 171         len = memdb_read(mdb->memdb, path, &data);
 172         if (len < 0)
 173                 return len;
 174
 175         if (offset < len) {
 176                 if (offset + size > len)
 177                         size = len - offset;
 178                 memcpy(buf, data + offset, size);
 179         } else {
 180                 size = 0;
 181         }
 182
 183         if (data)
 184                 g_free(data);
 185
 186         return size;
 187 }
 188
 189 static int cfs_plug_memdb_write(
 190         cfs_plug_t *plug,
 191         const char *path,
 192         const char *buf,
 193         size_t size,
 194         off_t offset,
 195         struct fuse_file_info *fi)
 196 {
 197         (void) fi;
 198
 199         g_return_val_if_fail(plug != NULL, PARAM_CHECK_ERRNO);
 200         g_return_val_if_fail(plug->ops == &cfs_ops, PARAM_CHECK_ERRNO);
 201         g_return_val_if_fail(path != NULL, PARAM_CHECK_ERRNO);
 202         g_return_val_if_fail(buf != NULL, PARAM_CHECK_ERRNO);
 203
 204         int res;
 205
 206         cfs_plug_memdb_t *mdb = (cfs_plug_memdb_t *)plug;
 207
 208         if (mdb->dfsm) {
 209                 res = dcdb_send_fuse_message(mdb->dfsm, DCDB_MESSAGE_CFS_WRITE, path, NULL, buf,
 210                                              size, offset, 0);
 211         } else {
 212                 uint32_t ctime = time(NULL);
 213                 res = memdb_write(mdb->memdb, path, 0, ctime, buf, size, offset, 0);
 214         }
 215
 216         return res;
 217 }
 218
 219 static int cfs_plug_memdb_truncate(cfs_plug_t *plug, const char *path, off_t size)
 220 {
 221         g_return_val_if_fail(plug != NULL, PARAM_CHECK_ERRNO);
 222         g_return_val_if_fail(plug->ops == &cfs_ops, PARAM_CHECK_ERRNO);
 223         g_return_val_if_fail(path != NULL, PARAM_CHECK_ERRNO);
 224
 225         int res;
 226
 227         cfs_plug_memdb_t *mdb = (cfs_plug_memdb_t *)plug;
 228
 229         if (mdb->dfsm) {
 230                 res = dcdb_send_fuse_message(mdb->dfsm, DCDB_MESSAGE_CFS_WRITE, path, NULL, NULL,
 231                                              0, size, 1);
 232         } else {
 233                 uint32_t ctime = time(NULL);
 234                 res = memdb_write(mdb->memdb, path, 0, ctime, NULL, 0, size, 1);
 235         }
 236
 237         return res;
 238 }
 239
 240 static int cfs_plug_memdb_create (
 241         cfs_plug_t *plug,
 242         const char *path,
 243         mode_t mode,
 244         struct fuse_file_info *fi)
 245 {
 246         g_return_val_if_fail(plug != NULL, PARAM_CHECK_ERRNO);
 247         g_return_val_if_fail(plug->ops == &cfs_ops, PARAM_CHECK_ERRNO);
 248         g_return_val_if_fail(path != NULL, PARAM_CHECK_ERRNO);
 249         g_return_val_if_fail(fi != NULL, PARAM_CHECK_ERRNO);
 250
 251         int res;
 252
 253         cfs_plug_memdb_t *mdb = (cfs_plug_memdb_t *)plug;
 254
 255         if (mdb->dfsm) {
 256                 res = dcdb_send_fuse_message(mdb->dfsm, DCDB_MESSAGE_CFS_CREATE, path,
 257                                              NULL, NULL, 0, 0, 0);
 258         } else {
 259                 uint32_t ctime = time(NULL);
 260
 261                 res = memdb_create(mdb->memdb, path, 0, ctime);
 262         }
 263
 264         return res;
 265 }
 266
 267 static int cfs_plug_memdb_mkdir(cfs_plug_t *plug, const char *path, mode_t mode)
 268 {
 269         g_return_val_if_fail(plug != NULL, PARAM_CHECK_ERRNO);
 270         g_return_val_if_fail(plug->ops == &cfs_ops, PARAM_CHECK_ERRNO);
 271         g_return_val_if_fail(path != NULL, PARAM_CHECK_ERRNO);
 272
 273         int res;
 274
 275         cfs_plug_memdb_t *mdb = (cfs_plug_memdb_t *)plug;
 276
 277         if (mdb->dfsm) {
 278                 res = dcdb_send_fuse_message(mdb->dfsm, DCDB_MESSAGE_CFS_MKDIR, path,
 279                                              NULL, NULL, 0, 0, 0);
 280         } else {
 281                 uint32_t ctime = time(NULL);
 282                 res = memdb_mkdir(mdb->memdb, path, 0, ctime);
 283         }
 284
 285         return res;
 286 }
 287
 288 static int cfs_plug_memdb_rmdir(cfs_plug_t *plug, const char *path)
 289 {
 290         g_return_val_if_fail(plug != NULL, PARAM_CHECK_ERRNO);
 291         g_return_val_if_fail(plug->ops == &cfs_ops, PARAM_CHECK_ERRNO);
 292         g_return_val_if_fail(path != NULL, PARAM_CHECK_ERRNO);
 293
 294         int res;
 295
 296         cfs_plug_memdb_t *mdb = (cfs_plug_memdb_t *)plug;
 297
 298         if (mdb->dfsm) {
 299                 res = dcdb_send_fuse_message(mdb->dfsm, DCDB_MESSAGE_CFS_DELETE, path,
 300                                              NULL, NULL, 0, 0, 0);
 301         } else {
 302                 uint32_t ctime = time(NULL);
 303                 res = memdb_delete(mdb->memdb, path, 0, ctime);
 304         }
 305
 306         return res;
 307 }
 308
 309 static int cfs_plug_memdb_rename(cfs_plug_t *plug, const char *from, const char *to)
 310 {
 311         g_return_val_if_fail(plug != NULL, PARAM_CHECK_ERRNO);
 312         g_return_val_if_fail(plug->ops == &cfs_ops, PARAM_CHECK_ERRNO);
 313         g_return_val_if_fail(from != NULL, PARAM_CHECK_ERRNO);
 314         g_return_val_if_fail(to != NULL, PARAM_CHECK_ERRNO);
 315
 316         int res;
 317
 318         cfs_plug_memdb_t *mdb = (cfs_plug_memdb_t *)plug;
 319
 320         if (mdb->dfsm) {
 321                 res = dcdb_send_fuse_message(mdb->dfsm, DCDB_MESSAGE_CFS_RENAME, from, to,
 322                                              NULL, 0, 0, 0);
 323         } else {
 324                 uint32_t ctime = time(NULL);
 325                 res = memdb_rename(mdb->memdb, from, to, 0, ctime);
 326         }
 327
 328         return res;
 329 }
 330
 331 static int cfs_plug_memdb_unlink(cfs_plug_t *plug, const char *path)
 332 {
 333         g_return_val_if_fail(plug != NULL, PARAM_CHECK_ERRNO);
 334         g_return_val_if_fail(plug->ops == &cfs_ops, PARAM_CHECK_ERRNO);
 335         g_return_val_if_fail(path != NULL, PARAM_CHECK_ERRNO);
 336
 337         int res;
 338
 339         cfs_plug_memdb_t *mdb = (cfs_plug_memdb_t *)plug;
 340
 341         if (mdb->dfsm) {
 342                 res = dcdb_send_fuse_message(mdb->dfsm, DCDB_MESSAGE_CFS_DELETE, path,
 343                                              NULL, NULL, 0, 0, 0);
 344         } else {
 345                 uint32_t ctime = time(NULL);
 346                 res = memdb_delete(mdb->memdb, path, 0, ctime);
 347         }
 348
 349         return res;
 350 }
 351
 352 static int cfs_plug_memdb_utimens(
 353         cfs_plug_t *plug,
 354         const char *path,
 355         const struct timespec tv[2])
 356 {
 357         g_return_val_if_fail(plug != NULL, PARAM_CHECK_ERRNO);
 358         g_return_val_if_fail(plug->ops == &cfs_ops, PARAM_CHECK_ERRNO);
 359         g_return_val_if_fail(path != NULL, PARAM_CHECK_ERRNO);
 360         g_return_val_if_fail(tv != NULL, PARAM_CHECK_ERRNO);
 361
 362         int res;
 363
 364         cfs_plug_memdb_t *mdb = (cfs_plug_memdb_t *)plug;
 365
 366         res = -EIO;
 367
 368         memdb_tree_entry_t *te = memdb_getattr(mdb->memdb, path);
 369         uint32_t mtime = tv[1].tv_sec;
 370
 371         gboolean unlock_req = FALSE;
 372         guchar csum[32];
 373
 374         if (te && mtime == 0 && te->type == DT_DIR &&
 375             path_is_lockdir(path)) {
 376                 unlock_req = TRUE;
 377         }
 378
 379         if (mdb->dfsm) {
 380                 if (unlock_req && memdb_tree_entry_csum(te, csum))
 381                         dcdb_send_unlock(mdb->dfsm, path, csum, TRUE);
 382
 383                 res = dcdb_send_fuse_message(mdb->dfsm, DCDB_MESSAGE_CFS_MTIME, path,
 384                                              NULL, NULL, 0, mtime, 0);
 385         } else {
 386                 uint32_t ctime = time(NULL);
 387                 if (unlock_req && memdb_tree_entry_csum(te, csum) &&
 388                     memdb_lock_expired(mdb->memdb, path, csum)) {
 389                         res = memdb_delete(mdb->memdb, path, 0, ctime);
 390                 } else {
 391                         res = memdb_mtime(mdb->memdb, path, 0, mtime);
 392                 }
 393         }
 394
 395         if (te)
 396                 g_free(te);
 397
 398         return res;
 399 }
 400
 401 static int cfs_plug_memdb_statfs(cfs_plug_t *plug, const char *path, struct statvfs *stbuf)
 402 {
 403         g_return_val_if_fail(plug != NULL, PARAM_CHECK_ERRNO);
 404         g_return_val_if_fail(plug->ops == &cfs_ops, PARAM_CHECK_ERRNO);
 405         g_return_val_if_fail(path != NULL, PARAM_CHECK_ERRNO);
 406         g_return_val_if_fail(stbuf != NULL, PARAM_CHECK_ERRNO);
 407
 408         cfs_plug_memdb_t *mdb = (cfs_plug_memdb_t *)plug;
 409
 410         return memdb_statfs(mdb->memdb, stbuf);
 411 }
 412
 413 static void cfs_plug_memdb_destroy(cfs_plug_t *plug)
 414 {
 415         g_return_if_fail(plug != NULL);
 416         g_return_if_fail(plug->ops == &cfs_ops);
 417
 418         g_free(plug->name);
 419
 420         g_free(plug);
 421 }
 422
 423 static cfs_plug_t *cfs_plug_memdb_lookup_plug(cfs_plug_t *plug, char **path)
 424 {
 425         g_return_val_if_fail(plug != NULL, NULL);
 426         g_return_val_if_fail(plug->ops == &cfs_ops, NULL);
 427
 428         return plug;
 429 }
 430
 431 static struct cfs_operations cfs_ops = {
 432         .getattr = cfs_plug_memdb_getattr,
 433         .readdir = cfs_plug_memdb_readdir,
 434         .open = cfs_plug_memdb_open,
 435         .create = cfs_plug_memdb_create,
 436         .read   = cfs_plug_memdb_read,
 437         .write = cfs_plug_memdb_write,
 438         .truncate = cfs_plug_memdb_truncate,
 439         .unlink = cfs_plug_memdb_unlink,
 440         .mkdir = cfs_plug_memdb_mkdir,
 441         .rmdir = cfs_plug_memdb_rmdir,
 442         .rename = cfs_plug_memdb_rename,
 443         .utimens = cfs_plug_memdb_utimens,
 444         .statfs = cfs_plug_memdb_statfs,
 445 #ifdef HAS_CFS_PLUG_MEMDB_LOCK
 446         .lock = cfs_plug_memdb_lock,
 447 #endif
 448 };
 449
 450 cfs_plug_memdb_t *cfs_plug_memdb_new(
 451         const char *name,
 452         memdb_t *memdb,
 453         dfsm_t *dfsm)
 454 {
 455         g_return_val_if_fail(name != NULL, NULL);
 456         g_return_val_if_fail(memdb != NULL, NULL);
 457
 458         cfs_plug_memdb_t *mdb = g_new0(cfs_plug_memdb_t, 1);
 459
 460         g_return_val_if_fail(mdb != NULL, NULL);
 461
 462         mdb->plug.ops = &cfs_ops;
 463
 464         mdb->plug.lookup_plug = cfs_plug_memdb_lookup_plug;
 465
 466         mdb->plug.destroy_plug = cfs_plug_memdb_destroy;
 467
 468         mdb->plug.name = g_strdup(name);
 469
 470         mdb->memdb = memdb;
 471
 472         mdb->dfsm = dfsm;
 473
 474         return mdb;
 475 }