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