fs/gfs2/ops_fstype.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/kthread.h>
  17 #include <linux/namei.h>
  18 #include <linux/mount.h>
  19 #include <linux/gfs2_ondisk.h>
  20 #include <linux/lm_interface.h>
  21
  22 #include "gfs2.h"
  23 #include "incore.h"
  24 #include "daemon.h"
  25 #include "glock.h"
  26 #include "glops.h"
  27 #include "inode.h"
  28 #include "lm.h"
  29 #include "mount.h"
  30 #include "ops_fstype.h"
  31 #include "ops_super.h"
  32 #include "recovery.h"
  33 #include "rgrp.h"
  34 #include "super.h"
  35 #include "sys.h"
  36 #include "util.h"
  37
  38 #define DO 0
  39 #define UNDO 1
  40
  41 extern struct dentry_operations gfs2_dops;
  42
  43 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  44 {
  45         struct gfs2_sbd *sdp;
  46
  47         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  48         if (!sdp)
  49                 return NULL;
  50
  51         sb->s_fs_info = sdp;
  52         sdp->sd_vfs = sb;
  53
  54         gfs2_tune_init(&sdp->sd_tune);
  55
  56         INIT_LIST_HEAD(&sdp->sd_reclaim_list);
  57         spin_lock_init(&sdp->sd_reclaim_lock);
  58         init_waitqueue_head(&sdp->sd_reclaim_wq);
  59
  60         mutex_init(&sdp->sd_inum_mutex);
  61         spin_lock_init(&sdp->sd_statfs_spin);
  62         mutex_init(&sdp->sd_statfs_mutex);
  63
  64         spin_lock_init(&sdp->sd_rindex_spin);
  65         mutex_init(&sdp->sd_rindex_mutex);
  66         INIT_LIST_HEAD(&sdp->sd_rindex_list);
  67         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
  68         INIT_LIST_HEAD(&sdp->sd_rindex_recent_list);
  69
  70         INIT_LIST_HEAD(&sdp->sd_jindex_list);
  71         spin_lock_init(&sdp->sd_jindex_spin);
  72         mutex_init(&sdp->sd_jindex_mutex);
  73
  74         INIT_LIST_HEAD(&sdp->sd_quota_list);
  75         spin_lock_init(&sdp->sd_quota_spin);
  76         mutex_init(&sdp->sd_quota_mutex);
  77
  78         spin_lock_init(&sdp->sd_log_lock);
  79
  80         INIT_LIST_HEAD(&sdp->sd_log_le_gl);
  81         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
  82         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
  83         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
  84         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
  85
  86         mutex_init(&sdp->sd_log_reserve_mutex);
  87         INIT_LIST_HEAD(&sdp->sd_ail1_list);
  88         INIT_LIST_HEAD(&sdp->sd_ail2_list);
  89
  90         init_rwsem(&sdp->sd_log_flush_lock);
  91         INIT_LIST_HEAD(&sdp->sd_log_flush_list);
  92
  93         INIT_LIST_HEAD(&sdp->sd_revoke_list);
  94
  95         mutex_init(&sdp->sd_freeze_lock);
  96
  97         return sdp;
  98 }
  99
 100 static void init_vfs(struct super_block *sb, unsigned noatime)
 101 {
 102         struct gfs2_sbd *sdp = sb->s_fs_info;
 103
 104         sb->s_magic = GFS2_MAGIC;
 105         sb->s_op = &gfs2_super_ops;
 106         sb->s_export_op = &gfs2_export_ops;
 107         sb->s_time_gran = 1;
 108         sb->s_maxbytes = MAX_LFS_FILESIZE;
 109
 110         if (sb->s_flags & (MS_NOATIME | MS_NODIRATIME))
 111                 set_bit(noatime, &sdp->sd_flags);
 112
 113         /* Don't let the VFS update atimes.  GFS2 handles this itself. */
 114         sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
 115 }
 116
 117 static int init_names(struct gfs2_sbd *sdp, int silent)
 118 {
 119         char *proto, *table;
 120         int error = 0;
 121
 122         proto = sdp->sd_args.ar_lockproto;
 123         table = sdp->sd_args.ar_locktable;
 124
 125         /*  Try to autodetect  */
 126
 127         if (!proto[0] || !table[0]) {
 128                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 129                 if (error)
 130                         return error;
 131
 132                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 133                 if (error)
 134                         goto out;
 135
 136                 if (!proto[0])
 137                         proto = sdp->sd_sb.sb_lockproto;
 138                 if (!table[0])
 139                         table = sdp->sd_sb.sb_locktable;
 140         }
 141
 142         if (!table[0])
 143                 table = sdp->sd_vfs->s_id;
 144
 145         snprintf(sdp->sd_proto_name, GFS2_FSNAME_LEN, "%s", proto);
 146         snprintf(sdp->sd_table_name, GFS2_FSNAME_LEN, "%s", table);
 147
 148         while ((table = strchr(sdp->sd_table_name, '/')))
 149                 *table = '_';
 150
 151 out:
 152         return error;
 153 }
 154
 155 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 156                         int undo)
 157 {
 158         struct task_struct *p;
 159         int error = 0;
 160
 161         if (undo)
 162                 goto fail_trans;
 163
 164         p = kthread_run(gfs2_scand, sdp, "gfs2_scand");
 165         error = IS_ERR(p);
 166         if (error) {
 167                 fs_err(sdp, "can't start scand thread: %d\n", error);
 168                 return error;
 169         }
 170         sdp->sd_scand_process = p;
 171
 172         for (sdp->sd_glockd_num = 0;
 173              sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
 174              sdp->sd_glockd_num++) {
 175                 p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
 176                 error = IS_ERR(p);
 177                 if (error) {
 178                         fs_err(sdp, "can't start glockd thread: %d\n", error);
 179                         goto fail;
 180                 }
 181                 sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
 182         }
 183
 184         error = gfs2_glock_nq_num(sdp,
 185                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 186                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 187                                   mount_gh);
 188         if (error) {
 189                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 190                 goto fail;
 191         }
 192
 193         error = gfs2_glock_nq_num(sdp,
 194                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 195                                   LM_ST_SHARED,
 196                                   LM_FLAG_NOEXP | GL_EXACT,
 197                                   &sdp->sd_live_gh);
 198         if (error) {
 199                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 200                 goto fail_mount;
 201         }
 202
 203         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 204                                CREATE, &sdp->sd_rename_gl);
 205         if (error) {
 206                 fs_err(sdp, "can't create rename glock: %d\n", error);
 207                 goto fail_live;
 208         }
 209
 210         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 211                                CREATE, &sdp->sd_trans_gl);
 212         if (error) {
 213                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 214                 goto fail_rename;
 215         }
 216         set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
 217
 218         return 0;
 219
 220 fail_trans:
 221         gfs2_glock_put(sdp->sd_trans_gl);
 222 fail_rename:
 223         gfs2_glock_put(sdp->sd_rename_gl);
 224 fail_live:
 225         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 226 fail_mount:
 227         gfs2_glock_dq_uninit(mount_gh);
 228 fail:
 229         while (sdp->sd_glockd_num--)
 230                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
 231
 232         kthread_stop(sdp->sd_scand_process);
 233         return error;
 234 }
 235
 236 static inline struct inode *gfs2_lookup_root(struct super_block *sb,
 237                                              u64 no_addr)
 238 {
 239         return gfs2_inode_lookup(sb, DT_DIR, no_addr, 0);
 240 }
 241
 242 static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
 243 {
 244         struct super_block *sb = sdp->sd_vfs;
 245         struct gfs2_holder sb_gh;
 246         u64 no_addr;
 247         struct inode *inode;
 248         int error = 0;
 249
 250         if (undo) {
 251                 if (sb->s_root) {
 252                         dput(sb->s_root);
 253                         sb->s_root = NULL;
 254                 }
 255                 return 0;
 256         }
 257
 258         error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 259                                  LM_ST_SHARED, 0, &sb_gh);
 260         if (error) {
 261                 fs_err(sdp, "can't acquire superblock glock: %d\n", error);
 262                 return error;
 263         }
 264
 265         error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
 266         if (error) {
 267                 fs_err(sdp, "can't read superblock: %d\n", error);
 268                 goto out;
 269         }
 270
 271         /* Set up the buffer cache and SB for real */
 272         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
 273                 error = -EINVAL;
 274                 fs_err(sdp, "FS block size (%u) is too small for device "
 275                        "block size (%u)\n",
 276                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
 277                 goto out;
 278         }
 279         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 280                 error = -EINVAL;
 281                 fs_err(sdp, "FS block size (%u) is too big for machine "
 282                        "page size (%u)\n",
 283                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 284                 goto out;
 285         }
 286         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 287
 288         /* Get the root inode */
 289         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 290         if (sb->s_type == &gfs2meta_fs_type)
 291                 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 292         inode = gfs2_lookup_root(sb, no_addr);
 293         if (IS_ERR(inode)) {
 294                 error = PTR_ERR(inode);
 295                 fs_err(sdp, "can't read in root inode: %d\n", error);
 296                 goto out;
 297         }
 298
 299         sb->s_root = d_alloc_root(inode);
 300         if (!sb->s_root) {
 301                 fs_err(sdp, "can't get root dentry\n");
 302                 error = -ENOMEM;
 303                 iput(inode);
 304         }
 305         sb->s_root->d_op = &gfs2_dops;
 306 out:
 307         gfs2_glock_dq_uninit(&sb_gh);
 308         return error;
 309 }
 310
 311 static int init_journal(struct gfs2_sbd *sdp, int undo)
 312 {
 313         struct gfs2_holder ji_gh;
 314         struct task_struct *p;
 315         struct gfs2_inode *ip;
 316         int jindex = 1;
 317         int error = 0;
 318
 319         if (undo) {
 320                 jindex = 0;
 321                 goto fail_recoverd;
 322         }
 323
 324         sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
 325         if (IS_ERR(sdp->sd_jindex)) {
 326                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 327                 return PTR_ERR(sdp->sd_jindex);
 328         }
 329         ip = GFS2_I(sdp->sd_jindex);
 330         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 331
 332         /* Load in the journal index special file */
 333
 334         error = gfs2_jindex_hold(sdp, &ji_gh);
 335         if (error) {
 336                 fs_err(sdp, "can't read journal index: %d\n", error);
 337                 goto fail;
 338         }
 339
 340         error = -EINVAL;
 341         if (!gfs2_jindex_size(sdp)) {
 342                 fs_err(sdp, "no journals!\n");
 343                 goto fail_jindex;
 344         }
 345
 346         if (sdp->sd_args.ar_spectator) {
 347                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 348                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 349         } else {
 350                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 351                         fs_err(sdp, "can't mount journal #%u\n",
 352                                sdp->sd_lockstruct.ls_jid);
 353                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 354                                gfs2_jindex_size(sdp),
 355                                gfs2_jindex_size(sdp) - 1);
 356                         goto fail_jindex;
 357                 }
 358                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 359
 360                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 361                                           &gfs2_journal_glops,
 362                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 363                                           &sdp->sd_journal_gh);
 364                 if (error) {
 365                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 366                         goto fail_jindex;
 367                 }
 368
 369                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 370                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 371                                            LM_FLAG_NOEXP | GL_EXACT,
 372                                            &sdp->sd_jinode_gh);
 373                 if (error) {
 374                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 375                                error);
 376                         goto fail_journal_gh;
 377                 }
 378
 379                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 380                 if (error) {
 381                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 382                                sdp->sd_jdesc->jd_jid, error);
 383                         goto fail_jinode_gh;
 384                 }
 385                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 386         }
 387
 388         if (sdp->sd_lockstruct.ls_first) {
 389                 unsigned int x;
 390                 for (x = 0; x < sdp->sd_journals; x++) {
 391                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 392                         if (error) {
 393                                 fs_err(sdp, "error recovering journal %u: %d\n",
 394                                        x, error);
 395                                 goto fail_jinode_gh;
 396                         }
 397                 }
 398
 399                 gfs2_lm_others_may_mount(sdp);
 400         } else if (!sdp->sd_args.ar_spectator) {
 401                 error = gfs2_recover_journal(sdp->sd_jdesc);
 402                 if (error) {
 403                         fs_err(sdp, "error recovering my journal: %d\n", error);
 404                         goto fail_jinode_gh;
 405                 }
 406         }
 407
 408         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 409         gfs2_glock_dq_uninit(&ji_gh);
 410         jindex = 0;
 411
 412         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 413         error = IS_ERR(p);
 414         if (error) {
 415                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
 416                 goto fail_jinode_gh;
 417         }
 418         sdp->sd_recoverd_process = p;
 419
 420         return 0;
 421
 422 fail_recoverd:
 423         kthread_stop(sdp->sd_recoverd_process);
 424 fail_jinode_gh:
 425         if (!sdp->sd_args.ar_spectator)
 426                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 427 fail_journal_gh:
 428         if (!sdp->sd_args.ar_spectator)
 429                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 430 fail_jindex:
 431         gfs2_jindex_free(sdp);
 432         if (jindex)
 433                 gfs2_glock_dq_uninit(&ji_gh);
 434 fail:
 435         iput(sdp->sd_jindex);
 436         return error;
 437 }
 438
 439
 440 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 441 {
 442         int error = 0;
 443         struct gfs2_inode *ip;
 444         struct inode *inode;
 445
 446         if (undo)
 447                 goto fail_qinode;
 448
 449         inode = gfs2_lookup_root(sdp->sd_vfs, sdp->sd_sb.sb_master_dir.no_addr);
 450         if (IS_ERR(inode)) {
 451                 error = PTR_ERR(inode);
 452                 fs_err(sdp, "can't read in master directory: %d\n", error);
 453                 goto fail;
 454         }
 455         sdp->sd_master_dir = inode;
 456
 457         error = init_journal(sdp, undo);
 458         if (error)
 459                 goto fail_master;
 460
 461         /* Read in the master inode number inode */
 462         sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
 463         if (IS_ERR(sdp->sd_inum_inode)) {
 464                 error = PTR_ERR(sdp->sd_inum_inode);
 465                 fs_err(sdp, "can't read in inum inode: %d\n", error);
 466                 goto fail_journal;
 467         }
 468
 469
 470         /* Read in the master statfs inode */
 471         sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
 472         if (IS_ERR(sdp->sd_statfs_inode)) {
 473                 error = PTR_ERR(sdp->sd_statfs_inode);
 474                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 475                 goto fail_inum;
 476         }
 477
 478         /* Read in the resource index inode */
 479         sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
 480         if (IS_ERR(sdp->sd_rindex)) {
 481                 error = PTR_ERR(sdp->sd_rindex);
 482                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 483                 goto fail_statfs;
 484         }
 485         ip = GFS2_I(sdp->sd_rindex);
 486         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 487         sdp->sd_rindex_vn = ip->i_gl->gl_vn - 1;
 488
 489         /* Read in the quota inode */
 490         sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
 491         if (IS_ERR(sdp->sd_quota_inode)) {
 492                 error = PTR_ERR(sdp->sd_quota_inode);
 493                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 494                 goto fail_rindex;
 495         }
 496         return 0;
 497
 498 fail_qinode:
 499         iput(sdp->sd_quota_inode);
 500 fail_rindex:
 501         gfs2_clear_rgrpd(sdp);
 502         iput(sdp->sd_rindex);
 503 fail_statfs:
 504         iput(sdp->sd_statfs_inode);
 505 fail_inum:
 506         iput(sdp->sd_inum_inode);
 507 fail_journal:
 508         init_journal(sdp, UNDO);
 509 fail_master:
 510         iput(sdp->sd_master_dir);
 511 fail:
 512         return error;
 513 }
 514
 515 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 516 {
 517         struct inode *pn = NULL;
 518         char buf[30];
 519         int error = 0;
 520         struct gfs2_inode *ip;
 521
 522         if (sdp->sd_args.ar_spectator)
 523                 return 0;
 524
 525         if (undo)
 526                 goto fail_qc_gh;
 527
 528         pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
 529         if (IS_ERR(pn)) {
 530                 error = PTR_ERR(pn);
 531                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 532                 return error;
 533         }
 534
 535         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 536         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 537         if (IS_ERR(sdp->sd_ir_inode)) {
 538                 error = PTR_ERR(sdp->sd_ir_inode);
 539                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 540                 goto fail;
 541         }
 542
 543         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 544         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 545         if (IS_ERR(sdp->sd_sc_inode)) {
 546                 error = PTR_ERR(sdp->sd_sc_inode);
 547                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 548                 goto fail_ir_i;
 549         }
 550
 551         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 552         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 553         if (IS_ERR(sdp->sd_qc_inode)) {
 554                 error = PTR_ERR(sdp->sd_qc_inode);
 555                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 556                 goto fail_ut_i;
 557         }
 558
 559         iput(pn);
 560         pn = NULL;
 561
 562         ip = GFS2_I(sdp->sd_ir_inode);
 563         error = gfs2_glock_nq_init(ip->i_gl,
 564                                    LM_ST_EXCLUSIVE, 0,
 565                                    &sdp->sd_ir_gh);
 566         if (error) {
 567                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 568                 goto fail_qc_i;
 569         }
 570
 571         ip = GFS2_I(sdp->sd_sc_inode);
 572         error = gfs2_glock_nq_init(ip->i_gl,
 573                                    LM_ST_EXCLUSIVE, 0,
 574                                    &sdp->sd_sc_gh);
 575         if (error) {
 576                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 577                 goto fail_ir_gh;
 578         }
 579
 580         ip = GFS2_I(sdp->sd_qc_inode);
 581         error = gfs2_glock_nq_init(ip->i_gl,
 582                                    LM_ST_EXCLUSIVE, 0,
 583                                    &sdp->sd_qc_gh);
 584         if (error) {
 585                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 586                 goto fail_ut_gh;
 587         }
 588
 589         return 0;
 590
 591 fail_qc_gh:
 592         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 593 fail_ut_gh:
 594         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 595 fail_ir_gh:
 596         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 597 fail_qc_i:
 598         iput(sdp->sd_qc_inode);
 599 fail_ut_i:
 600         iput(sdp->sd_sc_inode);
 601 fail_ir_i:
 602         iput(sdp->sd_ir_inode);
 603 fail:
 604         if (pn)
 605                 iput(pn);
 606         return error;
 607 }
 608
 609 static int init_threads(struct gfs2_sbd *sdp, int undo)
 610 {
 611         struct task_struct *p;
 612         int error = 0;
 613
 614         if (undo)
 615                 goto fail_quotad;
 616
 617         sdp->sd_log_flush_time = jiffies;
 618         sdp->sd_jindex_refresh_time = jiffies;
 619
 620         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 621         error = IS_ERR(p);
 622         if (error) {
 623                 fs_err(sdp, "can't start logd thread: %d\n", error);
 624                 return error;
 625         }
 626         sdp->sd_logd_process = p;
 627
 628         sdp->sd_statfs_sync_time = jiffies;
 629         sdp->sd_quota_sync_time = jiffies;
 630
 631         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 632         error = IS_ERR(p);
 633         if (error) {
 634                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 635                 goto fail;
 636         }
 637         sdp->sd_quotad_process = p;
 638
 639         return 0;
 640
 641
 642 fail_quotad:
 643         kthread_stop(sdp->sd_quotad_process);
 644 fail:
 645         kthread_stop(sdp->sd_logd_process);
 646         return error;
 647 }
 648
 649 /**
 650  * fill_super - Read in superblock
 651  * @sb: The VFS superblock
 652  * @data: Mount options
 653  * @silent: Don't complain if it's not a GFS2 filesystem
 654  *
 655  * Returns: errno
 656  */
 657
 658 static int fill_super(struct super_block *sb, void *data, int silent)
 659 {
 660         struct gfs2_sbd *sdp;
 661         struct gfs2_holder mount_gh;
 662         int error;
 663
 664         sdp = init_sbd(sb);
 665         if (!sdp) {
 666                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
 667                 return -ENOMEM;
 668         }
 669
 670         error = gfs2_mount_args(sdp, (char *)data, 0);
 671         if (error) {
 672                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
 673                 goto fail;
 674         }
 675
 676         init_vfs(sb, SDF_NOATIME);
 677
 678         /* Set up the buffer cache and fill in some fake block size values
 679            to allow us to read-in the on-disk superblock. */
 680         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
 681         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
 682         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 683                                GFS2_BASIC_BLOCK_SHIFT;
 684         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 685
 686         error = init_names(sdp, silent);
 687         if (error)
 688                 goto fail;
 689
 690         gfs2_create_debugfs_file(sdp);
 691
 692         error = gfs2_sys_fs_add(sdp);
 693         if (error)
 694                 goto fail;
 695
 696         error = gfs2_lm_mount(sdp, silent);
 697         if (error)
 698                 goto fail_sys;
 699
 700         error = init_locking(sdp, &mount_gh, DO);
 701         if (error)
 702                 goto fail_lm;
 703
 704         error = init_sb(sdp, silent, DO);
 705         if (error)
 706                 goto fail_locking;
 707
 708         error = init_inodes(sdp, DO);
 709         if (error)
 710                 goto fail_sb;
 711
 712         error = init_per_node(sdp, DO);
 713         if (error)
 714                 goto fail_inodes;
 715
 716         error = gfs2_statfs_init(sdp);
 717         if (error) {
 718                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
 719                 goto fail_per_node;
 720         }
 721
 722         error = init_threads(sdp, DO);
 723         if (error)
 724                 goto fail_per_node;
 725
 726         if (!(sb->s_flags & MS_RDONLY)) {
 727                 error = gfs2_make_fs_rw(sdp);
 728                 if (error) {
 729                         fs_err(sdp, "can't make FS RW: %d\n", error);
 730                         goto fail_threads;
 731                 }
 732         }
 733
 734         gfs2_glock_dq_uninit(&mount_gh);
 735
 736         return 0;
 737
 738 fail_threads:
 739         init_threads(sdp, UNDO);
 740 fail_per_node:
 741         init_per_node(sdp, UNDO);
 742 fail_inodes:
 743         init_inodes(sdp, UNDO);
 744 fail_sb:
 745         init_sb(sdp, 0, UNDO);
 746 fail_locking:
 747         init_locking(sdp, &mount_gh, UNDO);
 748 fail_lm:
 749         gfs2_gl_hash_clear(sdp, WAIT);
 750         gfs2_lm_unmount(sdp);
 751         while (invalidate_inodes(sb))
 752                 yield();
 753 fail_sys:
 754         gfs2_sys_fs_del(sdp);
 755 fail:
 756         gfs2_delete_debugfs_file(sdp);
 757         kfree(sdp);
 758         sb->s_fs_info = NULL;
 759         return error;
 760 }
 761
 762 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
 763                 const char *dev_name, void *data, struct vfsmount *mnt)
 764 {
 765         struct super_block *sb;
 766         struct gfs2_sbd *sdp;
 767         int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
 768         if (error)
 769                 goto out;
 770         sb = mnt->mnt_sb;
 771         sdp = sb->s_fs_info;
 772         sdp->sd_gfs2mnt = mnt;
 773 out:
 774         return error;
 775 }
 776
 777 static int fill_super_meta(struct super_block *sb, struct super_block *new,
 778                            void *data, int silent)
 779 {
 780         struct gfs2_sbd *sdp = sb->s_fs_info;
 781         struct inode *inode;
 782         int error = 0;
 783
 784         new->s_fs_info = sdp;
 785         sdp->sd_vfs_meta = sb;
 786
 787         init_vfs(new, SDF_NOATIME);
 788
 789         /* Get the master inode */
 790         inode = igrab(sdp->sd_master_dir);
 791
 792         new->s_root = d_alloc_root(inode);
 793         if (!new->s_root) {
 794                 fs_err(sdp, "can't get root dentry\n");
 795                 error = -ENOMEM;
 796                 iput(inode);
 797         } else
 798                 new->s_root->d_op = &gfs2_dops;
 799
 800         return error;
 801 }
 802
 803 static int set_bdev_super(struct super_block *s, void *data)
 804 {
 805         s->s_bdev = data;
 806         s->s_dev = s->s_bdev->bd_dev;
 807         return 0;
 808 }
 809
 810 static int test_bdev_super(struct super_block *s, void *data)
 811 {
 812         return s->s_bdev == data;
 813 }
 814
 815 static struct super_block* get_gfs2_sb(const char *dev_name)
 816 {
 817         struct kstat stat;
 818         struct nameidata nd;
 819         struct file_system_type *fstype;
 820         struct super_block *sb = NULL, *s;
 821         struct list_head *l;
 822         int error;
 823
 824         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
 825         if (error) {
 826                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
 827                        dev_name);
 828                 goto out;
 829         }
 830         error = vfs_getattr(nd.mnt, nd.dentry, &stat);
 831
 832         fstype = get_fs_type("gfs2");
 833         list_for_each(l, &fstype->fs_supers) {
 834                 s = list_entry(l, struct super_block, s_instances);
 835                 if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
 836                     (S_ISDIR(stat.mode) && s == nd.dentry->d_inode->i_sb)) {
 837                         sb = s;
 838                         goto free_nd;
 839                 }
 840         }
 841
 842         printk(KERN_WARNING "GFS2: Unrecognized block device or "
 843                "mount point %s\n", dev_name);
 844
 845 free_nd:
 846         path_release(&nd);
 847 out:
 848         return sb;
 849 }
 850
 851 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
 852                             const char *dev_name, void *data, struct vfsmount *mnt)
 853 {
 854         int error = 0;
 855         struct super_block *sb = NULL, *new;
 856         struct gfs2_sbd *sdp;
 857
 858         sb = get_gfs2_sb(dev_name);
 859         if (!sb) {
 860                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
 861                 error = -ENOENT;
 862                 goto error;
 863         }
 864         sdp = (struct gfs2_sbd*) sb->s_fs_info;
 865         if (sdp->sd_vfs_meta) {
 866                 printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
 867                 error = -EBUSY;
 868                 goto error;
 869         }
 870         down(&sb->s_bdev->bd_mount_sem);
 871         new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
 872         up(&sb->s_bdev->bd_mount_sem);
 873         if (IS_ERR(new)) {
 874                 error = PTR_ERR(new);
 875                 goto error;
 876         }
 877         module_put(fs_type->owner);
 878         new->s_flags = flags;
 879         strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
 880         sb_set_blocksize(new, sb->s_blocksize);
 881         error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
 882         if (error) {
 883                 up_write(&new->s_umount);
 884                 deactivate_super(new);
 885                 goto error;
 886         }
 887
 888         new->s_flags |= MS_ACTIVE;
 889
 890         /* Grab a reference to the gfs2 mount point */
 891         atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
 892         return simple_set_mnt(mnt, new);
 893 error:
 894         return error;
 895 }
 896
 897 static void gfs2_kill_sb(struct super_block *sb)
 898 {
 899         gfs2_delete_debugfs_file(sb->s_fs_info);
 900         kill_block_super(sb);
 901 }
 902
 903 static void gfs2_kill_sb_meta(struct super_block *sb)
 904 {
 905         struct gfs2_sbd *sdp = sb->s_fs_info;
 906         generic_shutdown_super(sb);
 907         sdp->sd_vfs_meta = NULL;
 908         atomic_dec(&sdp->sd_gfs2mnt->mnt_count);
 909 }
 910
 911 struct file_system_type gfs2_fs_type = {
 912         .name = "gfs2",
 913         .fs_flags = FS_REQUIRES_DEV,
 914         .get_sb = gfs2_get_sb,
 915         .kill_sb = gfs2_kill_sb,
 916         .owner = THIS_MODULE,
 917 };
 918
 919 struct file_system_type gfs2meta_fs_type = {
 920         .name = "gfs2meta",
 921         .fs_flags = FS_REQUIRES_DEV,
 922         .get_sb = gfs2_get_sb_meta,
 923         .kill_sb = gfs2_kill_sb_meta,
 924         .owner = THIS_MODULE,
 925 };
 926