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 #include <linux/config.h>
  18 #include <linux/module.h>
  19
  20 #define DEBUG_SUBSYSTEM S_LLITE
  21
  22 #include <linux/lustre_lite.h>
  23 #include <linux/lustre_ha.h>
  24
  25 kmem_cache_t *ll_file_data_slab;
  26 extern struct address_space_operations ll_aops;
  27 extern struct address_space_operations ll_dir_aops;
  28 struct super_operations ll_super_operations;
  29 extern int ll_commitcbd_setup(struct ll_sb_info *);
  30 extern int ll_commitcbd_cleanup(struct ll_sb_info *);
  31
  32 static char *ll_read_opt(const char *opt, char *data)
  33 {
  34         char *value;
  35         char *retval;
  36         ENTRY;
  37
  38         CDEBUG(D_INFO, "option: %s, data %s\n", opt, data);
  39         if ( strncmp(opt, data, strlen(opt)) )
  40                 RETURN(NULL);
  41         if ( (value = strchr(data, '=')) == NULL )
  42                 RETURN(NULL);
  43
  44         value++;
  45         OBD_ALLOC(retval, strlen(value) + 1);
  46         if ( !retval ) {
  47                 CERROR("out of memory!\n");
  48                 RETURN(NULL);
  49         }
  50
  51         memcpy(retval, value, strlen(value)+1);
  52         CDEBUG(D_SUPER, "Assigned option: %s, value %s\n", opt, retval);
  53         RETURN(retval);
  54 }
  55
  56 static void ll_options(char *options, char **dev, char **vers)
  57 {
  58         char *this_char;
  59         ENTRY;
  60
  61         if (!options) {
  62                 EXIT;
  63                 return;
  64         }
  65
  66         for (this_char = strtok (options, ",");
  67              this_char != NULL;
  68              this_char = strtok (NULL, ",")) {
  69                 CDEBUG(D_INFO, "this_char %s\n", this_char);
  70                 if ( (!*dev && (*dev = ll_read_opt("device", this_char)))||
  71                      (!*vers && (*vers = ll_read_opt("version", this_char))) )
  72                         continue;
  73         }
  74         EXIT;
  75 }
  76
  77 static struct super_block * ll_read_super(struct super_block *sb,
  78                                           void *data, int silent)
  79 {
  80         struct inode *root = 0;
  81         struct ll_sb_info *sbi;
  82         char *device = NULL;
  83         char *version = NULL;
  84         int devno;
  85         int err;
  86         struct ll_fid rootfid;
  87         struct ptlrpc_request *request = NULL;
  88
  89         ENTRY;
  90         MOD_INC_USE_COUNT;
  91
  92         OBD_ALLOC(sbi, sizeof(*sbi));
  93         if (!sbi) {
  94                 MOD_DEC_USE_COUNT;
  95                 RETURN(NULL);
  96         }
  97
  98         sb->u.generic_sbp = sbi;
  99
 100         ll_options(data, &device, &version);
 101
 102         if ( !device ) {
 103                 CERROR("no device\n");
 104                 GOTO(out_free, sb = NULL);
 105         }
 106
 107         devno = simple_strtoul(device, NULL, 0);
 108         if ( devno >= MAX_OBD_DEVICES ) {
 109                 CERROR("device of %s too high\n", device);
 110                 GOTO(out_free, sb = NULL);
 111         }
 112
 113         sbi->ll_conn.oc_dev = &obd_dev[devno];
 114         err = obd_connect(&sbi->ll_conn);
 115         if ( err ) {
 116                 CERROR("cannot connect to %s\n", device);
 117                 GOTO(out_free, sb = NULL);
 118         }
 119
 120         ptlrpc_init_client(ptlrpc_connmgr, MDS_REQUEST_PORTAL, MDC_REPLY_PORTAL,
 121                            &sbi->ll_mds_client);
 122
 123         sbi->ll_mds_conn = ptlrpc_uuid_to_connection("mds");
 124         if (!sbi->ll_mds_conn) {
 125                 CERROR("cannot find MDS\n");
 126                 GOTO(out_disc, sb = NULL);
 127         }
 128
 129         err = connmgr_connect(ptlrpc_connmgr, sbi->ll_mds_conn);
 130         if (err) {
 131                 CERROR("cannot connect to MDS\n");
 132                 ptlrpc_put_connection(sbi->ll_mds_conn);
 133                 GOTO(out_disc, sb = NULL);
 134         }
 135
 136         sbi->ll_mds_conn->c_level = LUSTRE_CONN_FULL;
 137
 138         err= mdc_connect(&sbi->ll_mds_client, sbi->ll_mds_conn,
 139                     &rootfid, &request);
 140         CERROR("rootfid %Ld\n", rootfid.id);
 141         if (err) {
 142                 CERROR("cannot mds_connect %d\n", err);
 143                 GOTO(out_disc, sb = NULL);
 144         }
 145         sbi->ll_rootino = rootfid.id;
 146
 147         sb->s_maxbytes = 1ULL << 36;
 148         sb->s_blocksize = PAGE_SIZE;
 149         sb->s_blocksize_bits = (unsigned char)PAGE_SHIFT;
 150         sb->s_magic = LL_SUPER_MAGIC;
 151         sb->s_op = &ll_super_operations;
 152
 153         /* make root inode */
 154         err = mdc_getattr(&sbi->ll_mds_client, sbi->ll_mds_conn,
 155                           sbi->ll_rootino, S_IFDIR,
 156                           OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, &request);
 157         if (err) {
 158                 CERROR("mdc_getattr failed for root %d\n", err);
 159                 GOTO(out_req, sb = NULL);
 160         }
 161
 162         /* initialize committed transaction callback daemon */
 163         INIT_LIST_HEAD(&sbi->ll_commitcbd_not_committed);
 164         spin_lock_init(&sbi->ll_commitcbd_lock);
 165         init_waitqueue_head(&sbi->ll_commitcbd_waitq);
 166         init_waitqueue_head(&sbi->ll_commitcbd_ctl_waitq);
 167         sbi->ll_commitcbd_flags = 0;
 168         err = ll_commitcbd_setup(sbi);
 169         if (err) {
 170                 CERROR("failed to start commit callback daemon\n");
 171                 GOTO(out_req, sb = NULL);
 172         }
 173
 174         root = iget4(sb, sbi->ll_rootino, NULL,
 175                      lustre_msg_buf(request->rq_repmsg, 0));
 176         if (root) {
 177                 sb->s_root = d_alloc_root(root);
 178         } else {
 179                 CERROR("lustre_lite: bad iget4 for root\n");
 180                 GOTO(out_req, sb = NULL);
 181         }
 182
 183 out_req:
 184         ptlrpc_free_req(request);
 185         if (!sb) {
 186 out_disc:
 187                 obd_disconnect(&sbi->ll_conn);
 188 out_free:
 189                 MOD_DEC_USE_COUNT;
 190                 OBD_FREE(sbi, sizeof(*sbi));
 191         }
 192         if (device)
 193                 OBD_FREE(device, strlen(device) + 1);
 194         if (version)
 195                 OBD_FREE(version, strlen(version) + 1);
 196
 197         RETURN(sb);
 198 } /* ll_read_super */
 199
 200 static void ll_put_super(struct super_block *sb)
 201 {
 202         struct ll_sb_info *sbi = sb->u.generic_sbp;
 203         ENTRY;
 204         ll_commitcbd_cleanup(sbi);
 205         obd_disconnect(&sbi->ll_conn);
 206         ptlrpc_put_connection(sbi->ll_mds_conn);
 207         OBD_FREE(sb->u.generic_sbp, sizeof(*sbi));
 208         MOD_DEC_USE_COUNT;
 209         EXIT;
 210 } /* ll_put_super */
 211
 212
 213 extern inline struct obdo * ll_oa_from_inode(struct inode *inode, int valid);
 214 static void ll_delete_inode(struct inode *inode)
 215 {
 216         if (S_ISREG(inode->i_mode)) {
 217                 int err;
 218                 struct obdo *oa;
 219                 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
 220                 if (!oa) {
 221                         CERROR("no memory\n");
 222                 }
 223
 224                 err = obd_destroy(ll_i2obdconn(inode), oa);
 225                 CDEBUG(D_INODE, "obd destroy of %Ld error %d\n",
 226                        (unsigned long long)oa->o_id, err);
 227                 obdo_free(oa);
 228         }
 229
 230         clear_inode(inode);
 231 }
 232
 233 /* like inode_setattr, but doesn't mark the inode dirty */
 234 static int ll_attr2inode(struct inode * inode, struct iattr * attr, int trunc)
 235 {
 236         unsigned int ia_valid = attr->ia_valid;
 237         int error = 0;
 238
 239         if ((ia_valid & ATTR_SIZE) && trunc ) {
 240                 error = vmtruncate(inode, attr->ia_size);
 241                 if (error)
 242                         goto out;
 243         } else if (ia_valid & ATTR_SIZE) {
 244                 inode->i_size = attr->ia_size;
 245         }
 246
 247         if (ia_valid & ATTR_UID)
 248                 inode->i_uid = attr->ia_uid;
 249         if (ia_valid & ATTR_GID)
 250                 inode->i_gid = attr->ia_gid;
 251         if (ia_valid & ATTR_ATIME)
 252                 inode->i_atime = attr->ia_atime;
 253         if (ia_valid & ATTR_MTIME)
 254                 inode->i_mtime = attr->ia_mtime;
 255         if (ia_valid & ATTR_CTIME)
 256                 inode->i_ctime = attr->ia_ctime;
 257         if (ia_valid & ATTR_MODE) {
 258                 inode->i_mode = attr->ia_mode;
 259                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 260                         inode->i_mode &= ~S_ISGID;
 261         }
 262 out:
 263         return error;
 264 }
 265
 266 int ll_inode_setattr(struct inode *inode, struct iattr *attr, int do_trunc)
 267 {
 268         struct ptlrpc_request *request = NULL;
 269         struct ll_sb_info *sbi = ll_i2sbi(inode);
 270         int err;
 271
 272         ENTRY;
 273
 274         /* change incore inode */
 275         ll_attr2inode(inode, attr, do_trunc);
 276
 277         err = mdc_setattr(&sbi->ll_mds_client, sbi->ll_mds_conn, inode, attr,
 278                           &request);
 279         if (err)
 280                 CERROR("mdc_setattr fails (%d)\n", err);
 281
 282         ptlrpc_free_req(request);
 283
 284         RETURN(err);
 285 }
 286
 287 int ll_setattr(struct dentry *de, struct iattr *attr)
 288 {
 289         return ll_inode_setattr(de->d_inode, attr, 1);
 290 }
 291
 292 static int ll_statfs(struct super_block *sb, struct statfs *buf)
 293 {
 294         struct statfs tmp;
 295         int err;
 296         ENTRY;
 297
 298         err = obd_statfs(&ll_s2sbi(sb)->ll_conn, &tmp);
 299         if (err) {
 300                 CERROR("obd_statfs fails (%d)\n", err);
 301                 RETURN(err);
 302         }
 303         memcpy(buf, &tmp, sizeof(*buf));
 304         CDEBUG(D_SUPER, "statfs returns avail %ld\n", tmp.f_bavail);
 305
 306         RETURN(err);
 307 }
 308
 309 static void inline ll_to_inode(struct inode *dst, struct mds_body *body)
 310 {
 311         struct ll_inode_info *ii =
 312                 (struct ll_inode_info *) &dst->u.generic_ip;
 313
 314         /* core attributes first */
 315         if ( body->valid & OBD_MD_FLID )
 316                 dst->i_ino = body->ino;
 317         if ( body->valid & OBD_MD_FLATIME )
 318                 dst->i_atime = body->atime;
 319         if ( body->valid & OBD_MD_FLMTIME )
 320                 dst->i_mtime = body->mtime;
 321         if ( body->valid & OBD_MD_FLCTIME )
 322                 dst->i_ctime = body->ctime;
 323         if ( body->valid & OBD_MD_FLSIZE )
 324                 dst->i_size = body->size;
 325         if ( body->valid & OBD_MD_FLMODE )
 326                 dst->i_mode = body->mode;
 327         if ( body->valid & OBD_MD_FLUID )
 328                 dst->i_uid = body->uid;
 329         if ( body->valid & OBD_MD_FLGID )
 330                 dst->i_gid = body->gid;
 331         if ( body->valid & OBD_MD_FLFLAGS )
 332                 dst->i_flags = body->flags;
 333         if ( body->valid & OBD_MD_FLNLINK )
 334                 dst->i_nlink = body->nlink;
 335         if ( body->valid & OBD_MD_FLGENER )
 336                 dst->i_generation = body->generation;
 337
 338         /* this will become more elaborate for striping etc */
 339         if (body->valid & OBD_MD_FLOBJID)
 340                 ii->lli_objid = body->objid;
 341 #if 0
 342
 343         if (obdo_has_inline(oa)) {
 344                 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 345                     S_ISFIFO(inode->i_mode)) {
 346                         obd_rdev rdev = *((obd_rdev *)oa->o_inline);
 347                         CDEBUG(D_INODE,
 348                                "copying device %x from obdo to inode\n", rdev);
 349                         init_special_inode(inode, inode->i_mode, rdev);
 350                 } else {
 351                         CDEBUG(D_INFO, "copying inline from obdo to inode\n");
 352                         memcpy(oinfo->lli_inline, oa->o_inline, OBD_INLINESZ);
 353                 }
 354                 oinfo->lli_flags |= OBD_FL_INLINEDATA;
 355         }
 356 #endif
 357 } /* ll_to_inode */
 358
 359 static inline void ll_read_inode2(struct inode *inode, void *opaque)
 360 {
 361         struct mds_body *body = opaque;
 362
 363         ENTRY;
 364         ll_to_inode(inode, body);
 365
 366         /* OIDEBUG(inode); */
 367
 368         if (S_ISREG(inode->i_mode)) {
 369                 inode->i_op = &ll_file_inode_operations;
 370                 inode->i_fop = &ll_file_operations;
 371                 inode->i_mapping->a_ops = &ll_aops;
 372                 EXIT;
 373         } else if (S_ISDIR(inode->i_mode)) {
 374                 inode->i_op = &ll_dir_inode_operations;
 375                 inode->i_fop = &ll_dir_operations;
 376                 inode->i_mapping->a_ops = &ll_dir_aops;
 377                 EXIT;
 378         } else if (S_ISLNK(inode->i_mode)) {
 379                 inode->i_op = &ll_fast_symlink_inode_operations;
 380                 EXIT;
 381         } else {
 382                 init_special_inode(inode, inode->i_mode,
 383                                    ((int *)ll_i2info(inode)->lli_inline)[0]);
 384                 EXIT;
 385         }
 386
 387         return;
 388 }
 389
 390 /* exported operations */
 391 struct super_operations ll_super_operations =
 392 {
 393         read_inode2: ll_read_inode2,
 394         delete_inode: ll_delete_inode,
 395         put_super: ll_put_super,
 396         // statfs: ll_statfs
 397 };
 398
 399 struct file_system_type lustre_lite_fs_type = {
 400         "lustre_lite", 0, ll_read_super, NULL
 401 };
 402
 403 static int __init init_lustre_lite(void)
 404 {
 405         printk(KERN_INFO "Lustre Lite 0.0.1, braam@clusterfs.com\n");
 406         ll_file_data_slab = kmem_cache_create("ll_file_data",
 407                                               sizeof(struct ll_file_data), 0,
 408                                                SLAB_HWCACHE_ALIGN, NULL, NULL);
 409         if (ll_file_data_slab == NULL)
 410                 return -ENOMEM;
 411         return register_filesystem(&lustre_lite_fs_type);
 412 }
 413
 414 static void __exit exit_lustre_lite(void)
 415 {
 416         unregister_filesystem(&lustre_lite_fs_type);
 417         kmem_cache_destroy(ll_file_data_slab);
 418 }
 419
 420 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
 421 MODULE_DESCRIPTION("Lustre Lite Client File System v1.0");
 422 MODULE_LICENSE("GPL");
 423
 424 module_init(init_lustre_lite);
 425 module_exit(exit_lustre_lite);