lustre/llite/super.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Lustre Light Super operations
   5  *
   6  * This code is issued under the GNU General Public License.
   7  * See the file COPYING in this distribution
   8  *
   9  * Copryright (C) 1996 Peter J. Braam <braam@stelias.com>
  10  * Copryright (C) 1999 Stelias Computing Inc. <braam@stelias.com>
  11  * Copryright (C) 1999 Seagate Technology Inc.
  12  * Copryright (C) 2001 Mountain View Data, Inc.
  13  * Copryright (C) 2002 Cluster File Systems, Inc.
  14  *
  15  */
  16
  17 #define DEBUG_SUBSYSTEM S_LLITE
  18
  19 #include <linux/module.h>
  20 #include <linux/lustre_lite.h>
  21 #include <linux/lustre_ha.h>
  22 #include <linux/lustre_dlm.h>
  23
  24 kmem_cache_t *ll_file_data_slab;
  25 extern struct address_space_operations ll_aops;
  26 extern struct address_space_operations ll_dir_aops;
  27 struct super_operations ll_super_operations;
  28
  29 extern int ll_recover(struct ptlrpc_client *);
  30 extern int ll_commitcbd_setup(struct ll_sb_info *);
  31 extern int ll_commitcbd_cleanup(struct ll_sb_info *);
  32
  33 static char *ll_read_opt(const char *opt, char *data)
  34 {
  35         char *value;
  36         char *retval;
  37         ENTRY;
  38
  39         CDEBUG(D_INFO, "option: %s, data %s\n", opt, data);
  40         if ( strncmp(opt, data, strlen(opt)) )
  41                 RETURN(NULL);
  42         if ( (value = strchr(data, '=')) == NULL )
  43                 RETURN(NULL);
  44
  45         value++;
  46         OBD_ALLOC(retval, strlen(value) + 1);
  47         if ( !retval ) {
  48                 CERROR("out of memory!\n");
  49                 RETURN(NULL);
  50         }
  51
  52         memcpy(retval, value, strlen(value)+1);
  53         CDEBUG(D_SUPER, "Assigned option: %s, value %s\n", opt, retval);
  54         RETURN(retval);
  55 }
  56
  57 static void ll_options(char *options, char **ost, char **mds)
  58 {
  59         char *this_char;
  60         ENTRY;
  61
  62         if (!options) {
  63                 EXIT;
  64                 return;
  65         }
  66
  67         for (this_char = strtok (options, ",");
  68              this_char != NULL;
  69              this_char = strtok (NULL, ",")) {
  70                 CDEBUG(D_INFO, "this_char %s\n", this_char);
  71                 if ( (!*ost && (*ost = ll_read_opt("ost", this_char)))||
  72                      (!*mds && (*mds = ll_read_opt("mds", this_char))) )
  73                         continue;
  74         }
  75         EXIT;
  76 }
  77
  78 static struct super_block * ll_read_super(struct super_block *sb,
  79                                           void *data, int silent)
  80 {
  81         struct inode *root = 0;
  82         struct ll_sb_info *sbi;
  83         char *ost = NULL;
  84         char *mds = NULL;
  85         int devno;
  86         int err;
  87         struct ll_fid rootfid;
  88         __u64 last_committed, last_rcvd;
  89         __u32 last_xid;
  90         struct ptlrpc_request *request = NULL;
  91         struct ll_inode_md md;
  92
  93         ENTRY;
  94         MOD_INC_USE_COUNT;
  95
  96         OBD_ALLOC(sbi, sizeof(*sbi));
  97         if (!sbi) {
  98                 MOD_DEC_USE_COUNT;
  99                 RETURN(NULL);
 100         }
 101
 102         sb->u.generic_sbp = sbi;
 103
 104         ll_options(data, &ost, &mds);
 105
 106         if (!ost) {
 107                 CERROR("no ost\n");
 108                 GOTO(out_free, sb = NULL);
 109         }
 110
 111         if (!mds) {
 112                 CERROR("no mds\n");
 113                 GOTO(out_free, sb = NULL);
 114         }
 115
 116         devno = simple_strtoul(ost, NULL, 0);
 117         if (devno >= MAX_OBD_DEVICES) {
 118                 CERROR("devno of %s too high\n", ost);
 119                 GOTO(out_free, sb = NULL);
 120         }
 121
 122         err = obd_connect(&sbi->ll_osc_conn, &obd_dev[devno]);
 123         if (err) {
 124                 CERROR("cannot connect to %s: rc = %d\n", ost, err);
 125                 GOTO(out_free, sb = NULL);
 126         }
 127
 128         devno = simple_strtoul(mds, NULL, 0);
 129         if (devno >= MAX_OBD_DEVICES) {
 130                 CERROR("devno of %s too high\n", mds);
 131                 GOTO(out_free, sb = NULL);
 132         }
 133
 134         err = obd_connect(&sbi->ll_mdc_conn, &obd_dev[devno]);
 135         if (err) {
 136                 CERROR("cannot connect to %s: rc = %d\n", mds, err);
 137                 GOTO(out_free, sb = NULL);
 138         }
 139
 140 #if 0
 141         err = connmgr_connect(ptlrpc_connmgr, sbi->ll_mds_conn);
 142         if (err) {
 143                 CERROR("cannot connect to MDS: rc = %d\n", err);
 144                 GOTO(out_rpc, sb = NULL);
 145         }
 146 #endif
 147
 148         sbi2mdc(sbi)->mdc_conn->c_level = LUSTRE_CONN_FULL;
 149
 150         /* XXX: need to store the last_* values somewhere */
 151         err = mdc_getstatus(&sbi->ll_mdc_conn,
 152                             &rootfid, &last_committed,
 153                             &last_rcvd, &last_xid,
 154                             &request);
 155         if (err) {
 156                 CERROR("cannot mds_connect: rc = %d\n", err);
 157                 GOTO(out_disc, sb = NULL);
 158         }
 159         CDEBUG(D_SUPER, "rootfid %ld\n", (unsigned long)rootfid.id);
 160         sbi->ll_rootino = rootfid.id;
 161
 162         sb->s_maxbytes = 1ULL << 36;
 163         /* XXX get this with a get_info call (like we have in OBDFS),
 164            this info call should return the blocksize of the MDS (statfs?) */
 165         sb->s_blocksize = 4096;
 166         sb->s_blocksize_bits = 12;
 167         sb->s_magic = LL_SUPER_MAGIC;
 168         sb->s_op = &ll_super_operations;
 169
 170         /* make root inode */
 171         err = mdc_getattr(&sbi->ll_mdc_conn,
 172                           sbi->ll_rootino, S_IFDIR,
 173                           OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
 174         if (err) {
 175                 CERROR("mdc_getattr failed for root: rc = %d\n", err);
 176                 GOTO(out_mdc, sb = NULL);
 177         }
 178
 179         /* initialize committed transaction callback daemon */
 180         spin_lock_init(&sbi->ll_commitcbd_lock);
 181         init_waitqueue_head(&sbi->ll_commitcbd_waitq);
 182         init_waitqueue_head(&sbi->ll_commitcbd_ctl_waitq);
 183         sbi->ll_commitcbd_flags = 0;
 184         err = ll_commitcbd_setup(sbi);
 185         if (err) {
 186                 CERROR("failed to start commit callback daemon: rc = %d\n",err);
 187                 GOTO(out_mdc, sb = NULL);
 188         }
 189
 190         md.body = lustre_msg_buf(request->rq_repmsg, 0);
 191         md.obdo = NULL;
 192         root = iget4(sb, sbi->ll_rootino, NULL, &md);
 193
 194         if (root) {
 195                 sb->s_root = d_alloc_root(root);
 196         } else {
 197                 CERROR("lustre_lite: bad iget4 for root\n");
 198                 GOTO(out_cdb, sb = NULL);
 199         }
 200
 201         ptlrpc_free_req(request);
 202
 203 out_dev:
 204         if (mds)
 205                 OBD_FREE(mds, strlen(mds) + 1);
 206         if (ost)
 207                 OBD_FREE(ost, strlen(ost) + 1);
 208
 209         RETURN(sb);
 210
 211 out_cdb:
 212         ll_commitcbd_cleanup(sbi);
 213 out_mdc:
 214         obd_disconnect(&sbi->ll_mdc_conn);
 215         obd_disconnect(&sbi->ll_osc_conn);
 216 out_disc:
 217         ptlrpc_free_req(request);
 218         obd_disconnect(&sbi->ll_osc_conn);
 219 out_free:
 220         OBD_FREE(sbi, sizeof(*sbi));
 221
 222         MOD_DEC_USE_COUNT;
 223         goto out_dev;
 224 } /* ll_read_super */
 225
 226 static void ll_put_super(struct super_block *sb)
 227 {
 228         struct ll_sb_info *sbi = ll_s2sbi(sb);
 229         ENTRY;
 230         ll_commitcbd_cleanup(sbi);
 231         obd_disconnect(&sbi->ll_osc_conn);
 232         obd_disconnect(&sbi->ll_mdc_conn);
 233         OBD_FREE(sbi, sizeof(*sbi));
 234
 235         MOD_DEC_USE_COUNT;
 236         EXIT;
 237 } /* ll_put_super */
 238
 239 static void ll_clear_inode(struct inode *inode)
 240 {
 241         if (atomic_read(&inode->i_count) == 0) {
 242                 struct obdo *oa = ll_i2info(inode)->lli_obdo;
 243                 if (oa) {
 244                         obdo_free(oa);
 245                         ll_i2info(inode)->lli_obdo = NULL;
 246                 }
 247                 if (ll_i2info(inode)->lli_symlink_name) {
 248                         OBD_FREE(ll_i2info(inode)->lli_symlink_name,
 249                                  strlen(ll_i2info(inode)->lli_symlink_name)+ 1);
 250                         ll_i2info(inode)->lli_symlink_name = NULL;
 251                 }
 252         }
 253 }
 254
 255 static void ll_delete_inode(struct inode *inode)
 256 {
 257         if (S_ISREG(inode->i_mode)) {
 258                 int err;
 259                 struct obdo *oa;
 260                 oa = ll_i2info(inode)->lli_obdo;
 261
 262                 if (!oa)
 263                         GOTO(out, -EINVAL);
 264
 265                 if (oa->o_id == 0)
 266                         /* No obdo was ever created */
 267                         GOTO(out, 0);
 268
 269                 err = obd_destroy(ll_i2obdconn(inode), oa);
 270                 CDEBUG(D_INODE, "obd destroy of %Ld error %d\n",
 271                        (unsigned long long)oa->o_id, err);
 272         }
 273 out:
 274         clear_inode(inode);
 275 }
 276
 277 /* like inode_setattr, but doesn't mark the inode dirty */
 278 static int ll_attr2inode(struct inode * inode, struct iattr * attr, int trunc)
 279 {
 280         unsigned int ia_valid = attr->ia_valid;
 281         int error = 0;
 282
 283         if ((ia_valid & ATTR_SIZE) && trunc) {
 284                 error = vmtruncate(inode, attr->ia_size);
 285                 if (error)
 286                         goto out;
 287         } else if (ia_valid & ATTR_SIZE)
 288                 inode->i_size = attr->ia_size;
 289
 290         if (ia_valid & ATTR_UID)
 291                 inode->i_uid = attr->ia_uid;
 292         if (ia_valid & ATTR_GID)
 293                 inode->i_gid = attr->ia_gid;
 294         if (ia_valid & ATTR_ATIME)
 295                 inode->i_atime = attr->ia_atime;
 296         if (ia_valid & ATTR_MTIME)
 297                 inode->i_mtime = attr->ia_mtime;
 298         if (ia_valid & ATTR_CTIME)
 299                 inode->i_ctime = attr->ia_ctime;
 300         if (ia_valid & ATTR_MODE) {
 301                 inode->i_mode = attr->ia_mode;
 302                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 303                         inode->i_mode &= ~S_ISGID;
 304         }
 305 out:
 306         return error;
 307 }
 308
 309 int ll_inode_setattr(struct inode *inode, struct iattr *attr, int do_trunc)
 310 {
 311         struct ptlrpc_request *request = NULL;
 312         struct ll_sb_info *sbi = ll_i2sbi(inode);
 313         int err;
 314
 315         ENTRY;
 316
 317         /* change incore inode */
 318         ll_attr2inode(inode, attr, do_trunc);
 319
 320         err = mdc_setattr(&sbi->ll_mdc_conn, inode, attr,
 321                           &request);
 322         if (err)
 323                 CERROR("mdc_setattr fails (%d)\n", err);
 324
 325         ptlrpc_req_finished(request);
 326
 327         RETURN(err);
 328 }
 329
 330 int ll_setattr(struct dentry *de, struct iattr *attr)
 331 {
 332         int rc = inode_change_ok(de->d_inode, attr);
 333
 334         if (rc)
 335                 return rc;
 336
 337         return ll_inode_setattr(de->d_inode, attr, 1);
 338 }
 339
 340 static int ll_statfs(struct super_block *sb, struct statfs *sfs)
 341 {
 342         struct ptlrpc_request *request = NULL;
 343         struct ll_sb_info *sbi = ll_s2sbi(sb);
 344         int err;
 345         ENTRY;
 346
 347         memset(sfs, 0, sizeof(*sfs));
 348         err = mdc_statfs(&sbi->ll_mdc_conn, sfs, &request);
 349         if (err)
 350                 CERROR("obd_statfs fails (%d)\n", err);
 351         else
 352                 CDEBUG(D_SUPER,
 353                        "statfs returns blocks %ld/%ld objects %ld/%ld\n",
 354                        sfs->f_bavail, sfs->f_blocks, sfs->f_files,sfs->f_ffree);
 355
 356         ptlrpc_req_finished(request);
 357
 358         RETURN(err);
 359 }
 360
 361 static void ll_to_inode(struct inode *dst, struct ll_inode_md *md)
 362 {
 363         struct mds_body *body = md->body;
 364         struct ll_inode_info *ii = ll_i2info(dst);
 365
 366         /* core attributes first */
 367         if (body->valid & OBD_MD_FLID)
 368                 dst->i_ino = body->ino;
 369         if (body->valid & OBD_MD_FLATIME)
 370                 dst->i_atime = body->atime;
 371         if (body->valid & OBD_MD_FLMTIME)
 372                 dst->i_mtime = body->mtime;
 373         if (body->valid & OBD_MD_FLCTIME)
 374                 dst->i_ctime = body->ctime;
 375         if (body->valid & OBD_MD_FLSIZE)
 376                 dst->i_size = body->size;
 377         if (body->valid & OBD_MD_FLMODE)
 378                 dst->i_mode = body->mode;
 379         if (body->valid & OBD_MD_FLUID)
 380                 dst->i_uid = body->uid;
 381         if (body->valid & OBD_MD_FLGID)
 382                 dst->i_gid = body->gid;
 383         if (body->valid & OBD_MD_FLFLAGS)
 384                 dst->i_flags = body->flags;
 385         if (body->valid & OBD_MD_FLNLINK)
 386                 dst->i_nlink = body->nlink;
 387         if (body->valid & OBD_MD_FLGENER)
 388                 dst->i_generation = body->generation;
 389
 390         /* this will become more elaborate for striping etc */
 391         if (md->obdo != NULL && md->obdo->o_valid != 0) {
 392                 ii->lli_obdo = obdo_alloc();
 393                 memcpy(ii->lli_obdo, md->obdo, sizeof(*md->obdo));
 394         }
 395 #if 0
 396
 397         if (obdo_has_inline(oa)) {
 398                 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 399                     S_ISFIFO(inode->i_mode)) {
 400                         obd_rdev rdev = *((obd_rdev *)oa->o_inline);
 401                         CDEBUG(D_INODE,
 402                                "copying device %x from obdo to inode\n", rdev);
 403                         init_special_inode(inode, inode->i_mode, rdev);
 404                 } else {
 405                         CDEBUG(D_INFO, "copying inline from obdo to inode\n");
 406                         memcpy(oinfo->lli_inline, oa->o_inline, OBD_INLINESZ);
 407                 }
 408                 oinfo->lli_flags |= OBD_FL_INLINEDATA;
 409         }
 410 #endif
 411 } /* ll_to_inode */
 412
 413 static void ll_read_inode2(struct inode *inode, void *opaque)
 414 {
 415         struct ll_inode_md *md = opaque;
 416
 417         ENTRY;
 418         ll_to_inode(inode, md);
 419
 420         /* OIDEBUG(inode); */
 421
 422         if (S_ISREG(inode->i_mode)) {
 423                 inode->i_op = &ll_file_inode_operations;
 424                 inode->i_fop = &ll_file_operations;
 425                 inode->i_mapping->a_ops = &ll_aops;
 426                 EXIT;
 427         } else if (S_ISDIR(inode->i_mode)) {
 428                 inode->i_op = &ll_dir_inode_operations;
 429                 inode->i_fop = &ll_dir_operations;
 430                 inode->i_mapping->a_ops = &ll_dir_aops;
 431                 EXIT;
 432         } else if (S_ISLNK(inode->i_mode)) {
 433                 inode->i_op = &ll_fast_symlink_inode_operations;
 434                 EXIT;
 435         } else {
 436                 init_special_inode(inode, inode->i_mode,
 437                                    ((int *)ll_i2info(inode)->lli_inline)[0]);
 438                 EXIT;
 439         }
 440
 441         return;
 442 }
 443
 444 /* exported operations */
 445 struct super_operations ll_super_operations =
 446 {
 447         read_inode2: ll_read_inode2,
 448         clear_inode: ll_clear_inode,
 449         delete_inode: ll_delete_inode,
 450         put_super: ll_put_super,
 451         statfs: ll_statfs
 452 };
 453
 454 struct file_system_type lustre_lite_fs_type = {
 455         "lustre_lite", 0, ll_read_super, NULL
 456 };
 457
 458 static int __init init_lustre_lite(void)
 459 {
 460         printk(KERN_INFO "Lustre Lite 0.0.1, braam@clusterfs.com\n");
 461         ll_file_data_slab = kmem_cache_create("ll_file_data",
 462                                               sizeof(struct ll_file_data), 0,
 463                                                SLAB_HWCACHE_ALIGN, NULL, NULL);
 464         if (ll_file_data_slab == NULL)
 465                 return -ENOMEM;
 466         return register_filesystem(&lustre_lite_fs_type);
 467 }
 468
 469 static void __exit exit_lustre_lite(void)
 470 {
 471         unregister_filesystem(&lustre_lite_fs_type);
 472         kmem_cache_destroy(ll_file_data_slab);
 473 }
 474
 475 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
 476 MODULE_DESCRIPTION("Lustre Lite Client File System v1.0");
 477 MODULE_LICENSE("GPL");
 478
 479 module_init(init_lustre_lite);
 480 module_exit(exit_lustre_lite);