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         __u64 last_committed, last_rcvd;
  88         __u32 last_xid;
  89         struct ptlrpc_request *request = NULL;
  90
  91         ENTRY;
  92         MOD_INC_USE_COUNT;
  93
  94         OBD_ALLOC(sbi, sizeof(*sbi));
  95         if (!sbi) {
  96                 MOD_DEC_USE_COUNT;
  97                 RETURN(NULL);
  98         }
  99
 100         sb->u.generic_sbp = sbi;
 101
 102         ll_options(data, &device, &version);
 103
 104         if (!device) {
 105                 CERROR("no device\n");
 106                 GOTO(out_free, sb = NULL);
 107         }
 108
 109         devno = simple_strtoul(device, NULL, 0);
 110         if (devno >= MAX_OBD_DEVICES) {
 111                 CERROR("device of %s too high\n", device);
 112                 GOTO(out_free, sb = NULL);
 113         }
 114
 115         sbi->ll_conn.oc_dev = &obd_dev[devno];
 116         err = obd_connect(&sbi->ll_conn);
 117         if (err) {
 118                 CERROR("cannot connect to %s: rc = %d\n", device, err);
 119                 GOTO(out_free, sb = NULL);
 120         }
 121
 122         ptlrpc_init_client(ptlrpc_connmgr, MDS_REQUEST_PORTAL, MDC_REPLY_PORTAL,
 123                            &sbi->ll_mds_client);
 124
 125         sbi->ll_mds_conn = ptlrpc_uuid_to_connection("mds");
 126         if (!sbi->ll_mds_conn) {
 127                 CERROR("cannot find MDS\n");
 128                 GOTO(out_disc, sb = NULL);
 129         }
 130
 131         err = connmgr_connect(ptlrpc_connmgr, sbi->ll_mds_conn);
 132         if (err) {
 133                 CERROR("cannot connect to MDS: rc = %d\n", err);
 134                 ptlrpc_put_connection(sbi->ll_mds_conn);
 135                 GOTO(out_disc, sb = NULL);
 136         }
 137
 138         sbi->ll_mds_conn->c_level = LUSTRE_CONN_FULL;
 139
 140         /* XXX: need to store the last_* values somewhere */
 141         err = mdc_connect(&sbi->ll_mds_client, sbi->ll_mds_conn,
 142                           &rootfid, &last_committed, &last_rcvd, &last_xid,
 143                           &request);
 144         if (err) {
 145                 CERROR("cannot mds_connect: rc = %d\n", err);
 146                 GOTO(out_disc, sb = NULL);
 147         }
 148         CERROR("rootfid %ld\n", (unsigned long)rootfid.id);
 149         sbi->ll_rootino = rootfid.id;
 150
 151         sb->s_maxbytes = 1ULL << 36;
 152         sb->s_blocksize = PAGE_SIZE;
 153         sb->s_blocksize_bits = (unsigned char)PAGE_SHIFT;
 154         sb->s_magic = LL_SUPER_MAGIC;
 155         sb->s_op = &ll_super_operations;
 156
 157         /* make root inode */
 158         err = mdc_getattr(&sbi->ll_mds_client, sbi->ll_mds_conn,
 159                           sbi->ll_rootino, S_IFDIR,
 160                           OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, &request);
 161         if (err) {
 162                 CERROR("mdc_getattr failed for root: rc = %d\n", err);
 163                 GOTO(out_req, sb = NULL);
 164         }
 165
 166         /* initialize committed transaction callback daemon */
 167         INIT_LIST_HEAD(&sbi->ll_commitcbd_not_committed);
 168         spin_lock_init(&sbi->ll_commitcbd_lock);
 169         init_waitqueue_head(&sbi->ll_commitcbd_waitq);
 170         init_waitqueue_head(&sbi->ll_commitcbd_ctl_waitq);
 171         sbi->ll_commitcbd_flags = 0;
 172         err = ll_commitcbd_setup(sbi);
 173         if (err) {
 174                 CERROR("failed to start commit callback daemon: rc = %d\n",err);
 175                 GOTO(out_req, sb = NULL);
 176         }
 177
 178         root = iget4(sb, sbi->ll_rootino, NULL,
 179                      lustre_msg_buf(request->rq_repmsg, 0));
 180         if (root) {
 181                 sb->s_root = d_alloc_root(root);
 182         } else {
 183                 CERROR("lustre_lite: bad iget4 for root\n");
 184                 GOTO(out_req, sb = NULL);
 185         }
 186
 187 out_req:
 188         ptlrpc_free_req(request);
 189         if (!sb) {
 190 out_disc:
 191                 obd_disconnect(&sbi->ll_conn);
 192 out_free:
 193                 MOD_DEC_USE_COUNT;
 194                 OBD_FREE(sbi, sizeof(*sbi));
 195         }
 196         if (device)
 197                 OBD_FREE(device, strlen(device) + 1);
 198         if (version)
 199                 OBD_FREE(version, strlen(version) + 1);
 200
 201         RETURN(sb);
 202 } /* ll_read_super */
 203
 204 static void ll_put_super(struct super_block *sb)
 205 {
 206         struct ll_sb_info *sbi = sb->u.generic_sbp;
 207         ENTRY;
 208         ll_commitcbd_cleanup(sbi);
 209         obd_disconnect(&sbi->ll_conn);
 210         ptlrpc_put_connection(sbi->ll_mds_conn);
 211         OBD_FREE(sb->u.generic_sbp, sizeof(*sbi));
 212         MOD_DEC_USE_COUNT;
 213         EXIT;
 214 } /* ll_put_super */
 215
 216
 217 extern inline struct obdo * ll_oa_from_inode(struct inode *inode, int valid);
 218 static void ll_delete_inode(struct inode *inode)
 219 {
 220         if (S_ISREG(inode->i_mode)) {
 221                 int err;
 222                 struct obdo *oa;
 223                 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
 224                 if (!oa) {
 225                         CERROR("no memory\n");
 226                 }
 227
 228                 err = obd_destroy(ll_i2obdconn(inode), oa);
 229                 CDEBUG(D_INODE, "obd destroy of %Ld error %d\n",
 230                        (unsigned long long)oa->o_id, err);
 231                 obdo_free(oa);
 232         }
 233
 234         clear_inode(inode);
 235 }
 236
 237 /* like inode_setattr, but doesn't mark the inode dirty */
 238 static int ll_attr2inode(struct inode * inode, struct iattr * attr, int trunc)
 239 {
 240         unsigned int ia_valid = attr->ia_valid;
 241         int error = 0;
 242
 243         if ((ia_valid & ATTR_SIZE) && trunc ) {
 244                 error = vmtruncate(inode, attr->ia_size);
 245                 if (error)
 246                         goto out;
 247         } else if (ia_valid & ATTR_SIZE) {
 248                 inode->i_size = attr->ia_size;
 249         }
 250
 251         if (ia_valid & ATTR_UID)
 252                 inode->i_uid = attr->ia_uid;
 253         if (ia_valid & ATTR_GID)
 254                 inode->i_gid = attr->ia_gid;
 255         if (ia_valid & ATTR_ATIME)
 256                 inode->i_atime = attr->ia_atime;
 257         if (ia_valid & ATTR_MTIME)
 258                 inode->i_mtime = attr->ia_mtime;
 259         if (ia_valid & ATTR_CTIME)
 260                 inode->i_ctime = attr->ia_ctime;
 261         if (ia_valid & ATTR_MODE) {
 262                 inode->i_mode = attr->ia_mode;
 263                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 264                         inode->i_mode &= ~S_ISGID;
 265         }
 266 out:
 267         return error;
 268 }
 269
 270 int ll_inode_setattr(struct inode *inode, struct iattr *attr, int do_trunc)
 271 {
 272         struct ptlrpc_request *request = NULL;
 273         struct ll_sb_info *sbi = ll_i2sbi(inode);
 274         int err;
 275
 276         ENTRY;
 277
 278         /* change incore inode */
 279         ll_attr2inode(inode, attr, do_trunc);
 280
 281         err = mdc_setattr(&sbi->ll_mds_client, sbi->ll_mds_conn, inode, attr,
 282                           &request);
 283         if (err)
 284                 CERROR("mdc_setattr fails (%d)\n", err);
 285
 286         ptlrpc_free_req(request);
 287
 288         RETURN(err);
 289 }
 290
 291 int ll_setattr(struct dentry *de, struct iattr *attr)
 292 {
 293         return ll_inode_setattr(de->d_inode, attr, 1);
 294 }
 295
 296 static int ll_statfs(struct super_block *sb, struct statfs *buf)
 297 {
 298         struct statfs tmp;
 299         int err;
 300         ENTRY;
 301
 302         err = obd_statfs(&ll_s2sbi(sb)->ll_conn, &tmp);
 303         if (err) {
 304                 CERROR("obd_statfs fails (%d)\n", err);
 305                 RETURN(err);
 306         }
 307         memcpy(buf, &tmp, sizeof(*buf));
 308         CDEBUG(D_SUPER, "statfs returns avail %ld\n", tmp.f_bavail);
 309
 310         RETURN(err);
 311 }
 312
 313 static void inline ll_to_inode(struct inode *dst, struct mds_body *body)
 314 {
 315         struct ll_inode_info *ii =
 316                 (struct ll_inode_info *) &dst->u.generic_ip;
 317
 318         /* core attributes first */
 319         if ( body->valid & OBD_MD_FLID )
 320                 dst->i_ino = body->ino;
 321         if ( body->valid & OBD_MD_FLATIME )
 322                 dst->i_atime = body->atime;
 323         if ( body->valid & OBD_MD_FLMTIME )
 324                 dst->i_mtime = body->mtime;
 325         if ( body->valid & OBD_MD_FLCTIME )
 326                 dst->i_ctime = body->ctime;
 327         if ( body->valid & OBD_MD_FLSIZE )
 328                 dst->i_size = body->size;
 329         if ( body->valid & OBD_MD_FLMODE )
 330                 dst->i_mode = body->mode;
 331         if ( body->valid & OBD_MD_FLUID )
 332                 dst->i_uid = body->uid;
 333         if ( body->valid & OBD_MD_FLGID )
 334                 dst->i_gid = body->gid;
 335         if ( body->valid & OBD_MD_FLFLAGS )
 336                 dst->i_flags = body->flags;
 337         if ( body->valid & OBD_MD_FLNLINK )
 338                 dst->i_nlink = body->nlink;
 339         if ( body->valid & OBD_MD_FLGENER )
 340                 dst->i_generation = body->generation;
 341
 342         /* this will become more elaborate for striping etc */
 343         if (body->valid & OBD_MD_FLOBJID)
 344                 ii->lli_objid = body->objid;
 345 #if 0
 346
 347         if (obdo_has_inline(oa)) {
 348                 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 349                     S_ISFIFO(inode->i_mode)) {
 350                         obd_rdev rdev = *((obd_rdev *)oa->o_inline);
 351                         CDEBUG(D_INODE,
 352                                "copying device %x from obdo to inode\n", rdev);
 353                         init_special_inode(inode, inode->i_mode, rdev);
 354                 } else {
 355                         CDEBUG(D_INFO, "copying inline from obdo to inode\n");
 356                         memcpy(oinfo->lli_inline, oa->o_inline, OBD_INLINESZ);
 357                 }
 358                 oinfo->lli_flags |= OBD_FL_INLINEDATA;
 359         }
 360 #endif
 361 } /* ll_to_inode */
 362
 363 static inline void ll_read_inode2(struct inode *inode, void *opaque)
 364 {
 365         struct mds_body *body = opaque;
 366
 367         ENTRY;
 368         ll_to_inode(inode, body);
 369
 370         /* OIDEBUG(inode); */
 371
 372         if (S_ISREG(inode->i_mode)) {
 373                 inode->i_op = &ll_file_inode_operations;
 374                 inode->i_fop = &ll_file_operations;
 375                 inode->i_mapping->a_ops = &ll_aops;
 376                 EXIT;
 377         } else if (S_ISDIR(inode->i_mode)) {
 378                 inode->i_op = &ll_dir_inode_operations;
 379                 inode->i_fop = &ll_dir_operations;
 380                 inode->i_mapping->a_ops = &ll_dir_aops;
 381                 EXIT;
 382         } else if (S_ISLNK(inode->i_mode)) {
 383                 inode->i_op = &ll_fast_symlink_inode_operations;
 384                 EXIT;
 385         } else {
 386                 init_special_inode(inode, inode->i_mode,
 387                                    ((int *)ll_i2info(inode)->lli_inline)[0]);
 388                 EXIT;
 389         }
 390
 391         return;
 392 }
 393
 394 /* exported operations */
 395 struct super_operations ll_super_operations =
 396 {
 397         read_inode2: ll_read_inode2,
 398         delete_inode: ll_delete_inode,
 399         put_super: ll_put_super,
 400         statfs: ll_statfs
 401 };
 402
 403 struct file_system_type lustre_lite_fs_type = {
 404         "lustre_lite", 0, ll_read_super, NULL
 405 };
 406
 407 static int __init init_lustre_lite(void)
 408 {
 409         printk(KERN_INFO "Lustre Lite 0.0.1, braam@clusterfs.com\n");
 410         ll_file_data_slab = kmem_cache_create("ll_file_data",
 411                                               sizeof(struct ll_file_data), 0,
 412                                                SLAB_HWCACHE_ALIGN, NULL, NULL);
 413         if (ll_file_data_slab == NULL)
 414                 return -ENOMEM;
 415         return register_filesystem(&lustre_lite_fs_type);
 416 }
 417
 418 static void __exit exit_lustre_lite(void)
 419 {
 420         unregister_filesystem(&lustre_lite_fs_type);
 421         kmem_cache_destroy(ll_file_data_slab);
 422 }
 423
 424 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
 425 MODULE_DESCRIPTION("Lustre Lite Client File System v1.0");
 426 MODULE_LICENSE("GPL");
 427
 428 module_init(init_lustre_lite);
 429 module_exit(exit_lustre_lite);