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 ptlrpc_request *request = NULL;
  87
  88         ENTRY;
  89         MOD_INC_USE_COUNT;
  90
  91         OBD_ALLOC(sbi, sizeof(*sbi));
  92         if (!sbi) {
  93                 MOD_DEC_USE_COUNT;
  94                 RETURN(NULL);
  95         }
  96
  97         sb->u.generic_sbp = sbi;
  98
  99         ll_options(data, &device, &version);
 100
 101         if ( !device ) {
 102                 CERROR("no device\n");
 103                 GOTO(out_free, sb = NULL);
 104         }
 105
 106         devno = simple_strtoul(device, NULL, 0);
 107         if ( devno >= MAX_OBD_DEVICES ) {
 108                 CERROR("device of %s too high\n", device);
 109                 GOTO(out_free, sb = NULL);
 110         }
 111
 112         sbi->ll_conn.oc_dev = &obd_dev[devno];
 113         err = obd_connect(&sbi->ll_conn);
 114         if ( err ) {
 115                 CERROR("cannot connect to %s\n", device);
 116                 GOTO(out_free, sb = NULL);
 117         }
 118
 119         ptlrpc_init_client(ptlrpc_connmgr, MDS_REQUEST_PORTAL, MDC_REPLY_PORTAL,
 120                            &sbi->ll_mds_client);
 121
 122         sbi->ll_mds_conn = ptlrpc_uuid_to_connection("mds");
 123         if (!sbi->ll_mds_conn) {
 124                 CERROR("cannot find MDS\n");
 125                 GOTO(out_disc, sb = NULL);
 126         }
 127
 128         err = connmgr_connect(ptlrpc_connmgr, sbi->ll_mds_conn);
 129         if (err) {
 130                 CERROR("cannot connect to MDS\n");
 131                 GOTO(out_disc, sb = NULL);
 132         }
 133
 134         sbi->ll_rootino = 2;
 135
 136         sb->s_maxbytes = 1LL << 36;
 137         sb->s_blocksize = PAGE_SIZE;
 138         sb->s_blocksize_bits = (unsigned char)PAGE_SHIFT;
 139         sb->s_magic = LL_SUPER_MAGIC;
 140         sb->s_op = &ll_super_operations;
 141
 142         /* make root inode */
 143         err = mdc_getattr(&sbi->ll_mds_client, sbi->ll_mds_conn,
 144                           sbi->ll_rootino, S_IFDIR,
 145                           OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, &request);
 146         if (err) {
 147                 CERROR("mdc_getattr failed for root %d\n", err);
 148                 GOTO(out_req, sb = NULL);
 149         }
 150
 151         /* initialize committed transaction callback daemon */
 152         INIT_LIST_HEAD(&sbi->ll_commitcbd_not_committed);
 153         spin_lock_init(&sbi->ll_commitcbd_lock);
 154         init_waitqueue_head(&sbi->ll_commitcbd_waitq);
 155         init_waitqueue_head(&sbi->ll_commitcbd_ctl_waitq);
 156         sbi->ll_commitcbd_flags = 0;
 157         err = ll_commitcbd_setup(sbi);
 158         if (err) {
 159                 CERROR("failed to start commit callback daemon\n");
 160                 GOTO(out_req, sb = NULL);
 161         }
 162
 163         root = iget4(sb, sbi->ll_rootino, NULL,
 164                      lustre_msg_buf(request->rq_repmsg, 0));
 165         if (root) {
 166                 sb->s_root = d_alloc_root(root);
 167         } else {
 168                 CERROR("lustre_lite: bad iget4 for root\n");
 169                 GOTO(out_req, sb = NULL);
 170         }
 171
 172 out_req:
 173         ptlrpc_free_req(request);
 174         if (!sb) {
 175 out_disc:
 176                 obd_disconnect(&sbi->ll_conn);
 177 out_free:
 178                 MOD_DEC_USE_COUNT;
 179                 OBD_FREE(sbi, sizeof(*sbi));
 180         }
 181         if (device)
 182                 OBD_FREE(device, strlen(device) + 1);
 183         if (version)
 184                 OBD_FREE(version, strlen(version) + 1);
 185
 186         RETURN(sb);
 187 } /* ll_read_super */
 188
 189 static void ll_put_super(struct super_block *sb)
 190 {
 191         struct ll_sb_info *sbi = sb->u.generic_sbp;
 192         ENTRY;
 193         ll_commitcbd_cleanup(sbi);
 194         obd_disconnect(&sbi->ll_conn);
 195         ptlrpc_put_connection(sbi->ll_mds_conn);
 196         OBD_FREE(sb->u.generic_sbp, sizeof(*sbi));
 197         MOD_DEC_USE_COUNT;
 198         EXIT;
 199 } /* ll_put_super */
 200
 201
 202 extern inline struct obdo * ll_oa_from_inode(struct inode *inode, int valid);
 203 static void ll_delete_inode(struct inode *inode)
 204 {
 205         if (S_ISREG(inode->i_mode)) {
 206                 int err;
 207                 struct obdo *oa;
 208                 oa = ll_oa_from_inode(inode, OBD_MD_FLNOTOBD);
 209                 if (!oa) {
 210                         CERROR("no memory\n");
 211                 }
 212
 213                 err = obd_destroy(ll_i2obdconn(inode), oa);
 214                 CDEBUG(D_INODE, "obd destroy of %Ld error %d\n",
 215                        oa->o_id, err);
 216                 obdo_free(oa);
 217         }
 218
 219         clear_inode(inode);
 220 }
 221
 222 /* like inode_setattr, but doesn't mark the inode dirty */
 223 static int ll_attr2inode(struct inode * inode, struct iattr * attr, int trunc)
 224 {
 225         unsigned int ia_valid = attr->ia_valid;
 226         int error = 0;
 227
 228         if ((ia_valid & ATTR_SIZE) && trunc ) {
 229                 error = vmtruncate(inode, attr->ia_size);
 230                 if (error)
 231                         goto out;
 232         } else if (ia_valid & ATTR_SIZE) {
 233                 inode->i_size = attr->ia_size;
 234         }
 235
 236         if (ia_valid & ATTR_UID)
 237                 inode->i_uid = attr->ia_uid;
 238         if (ia_valid & ATTR_GID)
 239                 inode->i_gid = attr->ia_gid;
 240         if (ia_valid & ATTR_ATIME)
 241                 inode->i_atime = attr->ia_atime;
 242         if (ia_valid & ATTR_MTIME)
 243                 inode->i_mtime = attr->ia_mtime;
 244         if (ia_valid & ATTR_CTIME)
 245                 inode->i_ctime = attr->ia_ctime;
 246         if (ia_valid & ATTR_MODE) {
 247                 inode->i_mode = attr->ia_mode;
 248                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 249                         inode->i_mode &= ~S_ISGID;
 250         }
 251 out:
 252         return error;
 253 }
 254
 255 int ll_inode_setattr(struct inode *inode, struct iattr *attr, int do_trunc)
 256 {
 257         struct ptlrpc_request *request = NULL;
 258         struct ll_sb_info *sbi = ll_i2sbi(inode);
 259         int err;
 260
 261         ENTRY;
 262
 263         /* change incore inode */
 264         ll_attr2inode(inode, attr, do_trunc);
 265
 266         err = mdc_setattr(&sbi->ll_mds_client, sbi->ll_mds_conn, inode, attr,
 267                           &request);
 268         if (err)
 269                 CERROR("mdc_setattr fails (%d)\n", err);
 270
 271         ptlrpc_free_req(request);
 272
 273         RETURN(err);
 274 }
 275
 276 int ll_setattr(struct dentry *de, struct iattr *attr)
 277 {
 278         return ll_inode_setattr(de->d_inode, attr, 1);
 279 }
 280
 281 static int ll_statfs(struct super_block *sb, struct statfs *buf)
 282 {
 283         struct statfs tmp;
 284         int err;
 285         ENTRY;
 286
 287         err = obd_statfs(ID(sb), &tmp);
 288         if ( err ) {
 289                 CERROR("obd_statfs fails (%d)\n", err);
 290                 RETURN(err);
 291         }
 292         memcpy(buf, &tmp, sizeof(*buf));
 293         CDEBUG(D_SUPER, "statfs returns avail %ld\n", tmp.f_bavail);
 294
 295         RETURN(err);
 296 }
 297
 298 static void inline ll_to_inode(struct inode *dst, struct mds_body *body)
 299 {
 300         struct ll_inode_info *ii =
 301                 (struct ll_inode_info *) &dst->u.generic_ip;
 302
 303         /* core attributes first */
 304         if ( body->valid & OBD_MD_FLID )
 305                 dst->i_ino = body->ino;
 306         if ( body->valid & OBD_MD_FLATIME )
 307                 dst->i_atime = body->atime;
 308         if ( body->valid & OBD_MD_FLMTIME )
 309                 dst->i_mtime = body->mtime;
 310         if ( body->valid & OBD_MD_FLCTIME )
 311                 dst->i_ctime = body->ctime;
 312         if ( body->valid & OBD_MD_FLSIZE )
 313                 dst->i_size = body->size;
 314         if ( body->valid & OBD_MD_FLMODE )
 315                 dst->i_mode = body->mode;
 316         if ( body->valid & OBD_MD_FLUID )
 317                 dst->i_uid = body->uid;
 318         if ( body->valid & OBD_MD_FLGID )
 319                 dst->i_gid = body->gid;
 320         if ( body->valid & OBD_MD_FLFLAGS )
 321                 dst->i_flags = body->flags;
 322         if ( body->valid & OBD_MD_FLNLINK )
 323                 dst->i_nlink = body->nlink;
 324         if ( body->valid & OBD_MD_FLGENER )
 325                 dst->i_generation = body->generation;
 326
 327         /* this will become more elaborate for striping etc */
 328         if (body->valid & OBD_MD_FLOBJID)
 329                 ii->lli_objid = body->objid;
 330 #if 0
 331
 332         if (obdo_has_inline(oa)) {
 333                 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
 334                     S_ISFIFO(inode->i_mode)) {
 335                         obd_rdev rdev = *((obd_rdev *)oa->o_inline);
 336                         CDEBUG(D_INODE,
 337                                "copying device %x from obdo to inode\n", rdev);
 338                         init_special_inode(inode, inode->i_mode, rdev);
 339                 } else {
 340                         CDEBUG(D_INFO, "copying inline from obdo to inode\n");
 341                         memcpy(oinfo->lli_inline, oa->o_inline, OBD_INLINESZ);
 342                 }
 343                 oinfo->lli_flags |= OBD_FL_INLINEDATA;
 344         }
 345 #endif
 346 } /* ll_to_inode */
 347
 348 static inline void ll_read_inode2(struct inode *inode, void *opaque)
 349 {
 350         struct mds_body *body = opaque;
 351
 352         ENTRY;
 353         ll_to_inode(inode, body);
 354
 355         /* OIDEBUG(inode); */
 356
 357         if (S_ISREG(inode->i_mode)) {
 358                 inode->i_op = &ll_file_inode_operations;
 359                 inode->i_fop = &ll_file_operations;
 360                 inode->i_mapping->a_ops = &ll_aops;
 361                 EXIT;
 362         } else if (S_ISDIR(inode->i_mode)) {
 363                 inode->i_op = &ll_dir_inode_operations;
 364                 inode->i_fop = &ll_dir_operations;
 365                 inode->i_mapping->a_ops = &ll_dir_aops;
 366                 EXIT;
 367         } else if (S_ISLNK(inode->i_mode)) {
 368                 inode->i_op = &ll_fast_symlink_inode_operations;
 369                 EXIT;
 370         } else {
 371                 init_special_inode(inode, inode->i_mode,
 372                                    ((int *)ll_i2info(inode)->lli_inline)[0]);
 373                 EXIT;
 374         }
 375
 376         return;
 377 }
 378
 379 /* exported operations */
 380 struct super_operations ll_super_operations =
 381 {
 382         read_inode2: ll_read_inode2,
 383         delete_inode: ll_delete_inode,
 384         put_super: ll_put_super,
 385         // statfs: ll_statfs
 386 };
 387
 388 struct file_system_type lustre_lite_fs_type = {
 389         "lustre_lite", 0, ll_read_super, NULL
 390 };
 391
 392 static int __init init_lustre_lite(void)
 393 {
 394         printk(KERN_INFO "Lustre Lite 0.0.1, braam@clusterfs.com\n");
 395         ll_file_data_slab = kmem_cache_create("ll_file_data",
 396                                               sizeof(struct ll_file_data), 0,
 397                                                SLAB_HWCACHE_ALIGN, NULL, NULL);
 398         if (ll_file_data_slab == NULL)
 399                 return -ENOMEM;
 400         return register_filesystem(&lustre_lite_fs_type);
 401 }
 402
 403 static void __exit exit_lustre_lite(void)
 404 {
 405         unregister_filesystem(&lustre_lite_fs_type);
 406         kmem_cache_destroy(ll_file_data_slab);
 407 }
 408
 409 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
 410 MODULE_DESCRIPTION("Lustre Lite Client File System v1.0");
 411 MODULE_LICENSE("GPL");
 412
 413 module_init(init_lustre_lite);
 414 module_exit(exit_lustre_lite);