git.oblomov.eu Git - linux-2.6/blob - 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_export.h"
  31 #include "ops_fstype.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 extern struct dentry_operations gfs2_dops;
  43
  44 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  45 {
  46         struct gfs2_sbd *sdp;
  47
  48         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  49         if (!sdp)
  50                 return NULL;
  51
  52         sb->s_fs_info = sdp;
  53         sdp->sd_vfs = sb;
  54
  55         gfs2_tune_init(&sdp->sd_tune);
  56
  57         INIT_LIST_HEAD(&sdp->sd_reclaim_list);
  58         spin_lock_init(&sdp->sd_reclaim_lock);
  59         init_waitqueue_head(&sdp->sd_reclaim_wq);
  60
  61         mutex_init(&sdp->sd_inum_mutex);
  62         spin_lock_init(&sdp->sd_statfs_spin);
  63         mutex_init(&sdp->sd_statfs_mutex);
  64
  65         spin_lock_init(&sdp->sd_rindex_spin);
  66         mutex_init(&sdp->sd_rindex_mutex);
  67         INIT_LIST_HEAD(&sdp->sd_rindex_list);
  68         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
  69         INIT_LIST_HEAD(&sdp->sd_rindex_recent_list);
  70
  71         INIT_LIST_HEAD(&sdp->sd_jindex_list);
  72         spin_lock_init(&sdp->sd_jindex_spin);
  73         mutex_init(&sdp->sd_jindex_mutex);
  74
  75         INIT_LIST_HEAD(&sdp->sd_quota_list);
  76         spin_lock_init(&sdp->sd_quota_spin);
  77         mutex_init(&sdp->sd_quota_mutex);
  78
  79         spin_lock_init(&sdp->sd_log_lock);
  80
  81         INIT_LIST_HEAD(&sdp->sd_log_le_gl);
  82         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
  83         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
  84         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
  85         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
  86
  87         mutex_init(&sdp->sd_log_reserve_mutex);
  88         INIT_LIST_HEAD(&sdp->sd_ail1_list);
  89         INIT_LIST_HEAD(&sdp->sd_ail2_list);
  90
  91         init_rwsem(&sdp->sd_log_flush_lock);
  92         INIT_LIST_HEAD(&sdp->sd_log_flush_list);
  93
  94         INIT_LIST_HEAD(&sdp->sd_revoke_list);
  95
  96         mutex_init(&sdp->sd_freeze_lock);
  97
  98         return sdp;
  99 }
 100
 101 static void init_vfs(struct super_block *sb, unsigned noatime)
 102 {
 103         struct gfs2_sbd *sdp = sb->s_fs_info;
 104
 105         sb->s_magic = GFS2_MAGIC;
 106         sb->s_op = &gfs2_super_ops;
 107         sb->s_export_op = &gfs2_export_ops;
 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         struct page *page;
 120         char *proto, *table;
 121         int error = 0;
 122
 123         proto = sdp->sd_args.ar_lockproto;
 124         table = sdp->sd_args.ar_locktable;
 125
 126         /*  Try to autodetect  */
 127
 128         if (!proto[0] || !table[0]) {
 129                 struct gfs2_sb *sb;
 130                 page = gfs2_read_super(sdp->sd_vfs, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 131                 if (!page)
 132                         return -ENOBUFS;
 133                 sb = kmap(page);
 134                 gfs2_sb_in(&sdp->sd_sb, sb);
 135                 kunmap(page);
 136                 __free_page(page);
 137
 138                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 139                 if (error)
 140                         goto out;
 141
 142                 if (!proto[0])
 143                         proto = sdp->sd_sb.sb_lockproto;
 144                 if (!table[0])
 145                         table = sdp->sd_sb.sb_locktable;
 146         }
 147
 148         if (!table[0])
 149                 table = sdp->sd_vfs->s_id;
 150
 151         snprintf(sdp->sd_proto_name, GFS2_FSNAME_LEN, "%s", proto);
 152         snprintf(sdp->sd_table_name, GFS2_FSNAME_LEN, "%s", table);
 153
 154 out:
 155         return error;
 156 }
 157
 158 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 159                         int undo)
 160 {
 161         struct task_struct *p;
 162         int error = 0;
 163
 164         if (undo)
 165                 goto fail_trans;
 166
 167         p = kthread_run(gfs2_scand, sdp, "gfs2_scand");
 168         error = IS_ERR(p);
 169         if (error) {
 170                 fs_err(sdp, "can't start scand thread: %d\n", error);
 171                 return error;
 172         }
 173         sdp->sd_scand_process = p;
 174
 175         for (sdp->sd_glockd_num = 0;
 176              sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
 177              sdp->sd_glockd_num++) {
 178                 p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
 179                 error = IS_ERR(p);
 180                 if (error) {
 181                         fs_err(sdp, "can't start glockd thread: %d\n", error);
 182                         goto fail;
 183                 }
 184                 sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
 185         }
 186
 187         error = gfs2_glock_nq_num(sdp,
 188                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 189                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 190                                   mount_gh);
 191         if (error) {
 192                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 193                 goto fail;
 194         }
 195
 196         error = gfs2_glock_nq_num(sdp,
 197                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 198                                   LM_ST_SHARED,
 199                                   LM_FLAG_NOEXP | GL_EXACT,
 200                                   &sdp->sd_live_gh);
 201         if (error) {
 202                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 203                 goto fail_mount;
 204         }
 205
 206         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 207                                CREATE, &sdp->sd_rename_gl);
 208         if (error) {
 209                 fs_err(sdp, "can't create rename glock: %d\n", error);
 210                 goto fail_live;
 211         }
 212
 213         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 214                                CREATE, &sdp->sd_trans_gl);
 215         if (error) {
 216                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 217                 goto fail_rename;
 218         }
 219         set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
 220
 221         return 0;
 222
 223 fail_trans:
 224         gfs2_glock_put(sdp->sd_trans_gl);
 225 fail_rename:
 226         gfs2_glock_put(sdp->sd_rename_gl);
 227 fail_live:
 228         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 229 fail_mount:
 230         gfs2_glock_dq_uninit(mount_gh);
 231 fail:
 232         while (sdp->sd_glockd_num--)
 233                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
 234
 235         kthread_stop(sdp->sd_scand_process);
 236         return error;
 237 }
 238
 239 static struct inode *gfs2_lookup_root(struct super_block *sb,
 240                                       struct gfs2_inum_host *inum)
 241 {
 242         return gfs2_inode_lookup(sb, inum, DT_DIR);
 243 }
 244
 245 static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
 246 {
 247         struct super_block *sb = sdp->sd_vfs;
 248         struct gfs2_holder sb_gh;
 249         struct gfs2_inum_host *inum;
 250         struct inode *inode;
 251         int error = 0;
 252
 253         if (undo) {
 254                 if (sb->s_root) {
 255                         dput(sb->s_root);
 256                         sb->s_root = NULL;
 257                 }
 258                 return 0;
 259         }
 260
 261         error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 262                                  LM_ST_SHARED, 0, &sb_gh);
 263         if (error) {
 264                 fs_err(sdp, "can't acquire superblock glock: %d\n", error);
 265                 return error;
 266         }
 267
 268         error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
 269         if (error) {
 270                 fs_err(sdp, "can't read superblock: %d\n", error);
 271                 goto out;
 272         }
 273
 274         /* Set up the buffer cache and SB for real */
 275         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
 276                 error = -EINVAL;
 277                 fs_err(sdp, "FS block size (%u) is too small for device "
 278                        "block size (%u)\n",
 279                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
 280                 goto out;
 281         }
 282         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 283                 error = -EINVAL;
 284                 fs_err(sdp, "FS block size (%u) is too big for machine "
 285                        "page size (%u)\n",
 286                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 287                 goto out;
 288         }
 289         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 290
 291         /* Get the root inode */
 292         inum = &sdp->sd_sb.sb_root_dir;
 293         if (sb->s_type == &gfs2meta_fs_type)
 294                 inum = &sdp->sd_sb.sb_master_dir;
 295         inode = gfs2_lookup_root(sb, inum);
 296         if (IS_ERR(inode)) {
 297                 error = PTR_ERR(inode);
 298                 fs_err(sdp, "can't read in root inode: %d\n", error);
 299                 goto out;
 300         }
 301
 302         sb->s_root = d_alloc_root(inode);
 303         if (!sb->s_root) {
 304                 fs_err(sdp, "can't get root dentry\n");
 305                 error = -ENOMEM;
 306                 iput(inode);
 307         }
 308         sb->s_root->d_op = &gfs2_dops;
 309 out:
 310         gfs2_glock_dq_uninit(&sb_gh);
 311         return error;
 312 }
 313
 314 static int init_journal(struct gfs2_sbd *sdp, int undo)
 315 {
 316         struct gfs2_holder ji_gh;
 317         struct task_struct *p;
 318         struct gfs2_inode *ip;
 319         int jindex = 1;
 320         int error = 0;
 321
 322         if (undo) {
 323                 jindex = 0;
 324                 goto fail_recoverd;
 325         }
 326
 327         sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
 328         if (IS_ERR(sdp->sd_jindex)) {
 329                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 330                 return PTR_ERR(sdp->sd_jindex);
 331         }
 332         ip = GFS2_I(sdp->sd_jindex);
 333         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 334
 335         /* Load in the journal index special file */
 336
 337         error = gfs2_jindex_hold(sdp, &ji_gh);
 338         if (error) {
 339                 fs_err(sdp, "can't read journal index: %d\n", error);
 340                 goto fail;
 341         }
 342
 343         error = -EINVAL;
 344         if (!gfs2_jindex_size(sdp)) {
 345                 fs_err(sdp, "no journals!\n");
 346                 goto fail_jindex;
 347         }
 348
 349         if (sdp->sd_args.ar_spectator) {
 350                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 351                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 352         } else {
 353                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 354                         fs_err(sdp, "can't mount journal #%u\n",
 355                                sdp->sd_lockstruct.ls_jid);
 356                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 357                                gfs2_jindex_size(sdp),
 358                                gfs2_jindex_size(sdp) - 1);
 359                         goto fail_jindex;
 360                 }
 361                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 362
 363                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 364                                           &gfs2_journal_glops,
 365                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 366                                           &sdp->sd_journal_gh);
 367                 if (error) {
 368                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 369                         goto fail_jindex;
 370                 }
 371
 372                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 373                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 374                                            LM_FLAG_NOEXP | GL_EXACT,
 375                                            &sdp->sd_jinode_gh);
 376                 if (error) {
 377                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 378                                error);
 379                         goto fail_journal_gh;
 380                 }
 381
 382                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 383                 if (error) {
 384                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 385                                sdp->sd_jdesc->jd_jid, error);
 386                         goto fail_jinode_gh;
 387                 }
 388                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 389         }
 390
 391         if (sdp->sd_lockstruct.ls_first) {
 392                 unsigned int x;
 393                 for (x = 0; x < sdp->sd_journals; x++) {
 394                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 395                         if (error) {
 396                                 fs_err(sdp, "error recovering journal %u: %d\n",
 397                                        x, error);
 398                                 goto fail_jinode_gh;
 399                         }
 400                 }
 401
 402                 gfs2_lm_others_may_mount(sdp);
 403         } else if (!sdp->sd_args.ar_spectator) {
 404                 error = gfs2_recover_journal(sdp->sd_jdesc);
 405                 if (error) {
 406                         fs_err(sdp, "error recovering my journal: %d\n", error);
 407                         goto fail_jinode_gh;
 408                 }
 409         }
 410
 411         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 412         gfs2_glock_dq_uninit(&ji_gh);
 413         jindex = 0;
 414
 415         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 416         error = IS_ERR(p);
 417         if (error) {
 418                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
 419                 goto fail_jinode_gh;
 420         }
 421         sdp->sd_recoverd_process = p;
 422
 423         return 0;
 424
 425 fail_recoverd:
 426         kthread_stop(sdp->sd_recoverd_process);
 427 fail_jinode_gh:
 428         if (!sdp->sd_args.ar_spectator)
 429                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 430 fail_journal_gh:
 431         if (!sdp->sd_args.ar_spectator)
 432                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 433 fail_jindex:
 434         gfs2_jindex_free(sdp);
 435         if (jindex)
 436                 gfs2_glock_dq_uninit(&ji_gh);
 437 fail:
 438         iput(sdp->sd_jindex);
 439         return error;
 440 }
 441
 442
 443 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 444 {
 445         int error = 0;
 446         struct gfs2_inode *ip;
 447         struct inode *inode;
 448
 449         if (undo)
 450                 goto fail_qinode;
 451
 452         inode = gfs2_lookup_root(sdp->sd_vfs, &sdp->sd_sb.sb_master_dir);
 453         if (IS_ERR(inode)) {
 454                 error = PTR_ERR(inode);
 455                 fs_err(sdp, "can't read in master directory: %d\n", error);
 456                 goto fail;
 457         }
 458         sdp->sd_master_dir = inode;
 459
 460         error = init_journal(sdp, undo);
 461         if (error)
 462                 goto fail_master;
 463
 464         /* Read in the master inode number inode */
 465         sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
 466         if (IS_ERR(sdp->sd_inum_inode)) {
 467                 error = PTR_ERR(sdp->sd_inum_inode);
 468                 fs_err(sdp, "can't read in inum inode: %d\n", error);
 469                 goto fail_journal;
 470         }
 471
 472
 473         /* Read in the master statfs inode */
 474         sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
 475         if (IS_ERR(sdp->sd_statfs_inode)) {
 476                 error = PTR_ERR(sdp->sd_statfs_inode);
 477                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 478                 goto fail_inum;
 479         }
 480
 481         /* Read in the resource index inode */
 482         sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
 483         if (IS_ERR(sdp->sd_rindex)) {
 484                 error = PTR_ERR(sdp->sd_rindex);
 485                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 486                 goto fail_statfs;
 487         }
 488         ip = GFS2_I(sdp->sd_rindex);
 489         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 490         sdp->sd_rindex_vn = ip->i_gl->gl_vn - 1;
 491
 492         /* Read in the quota inode */
 493         sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
 494         if (IS_ERR(sdp->sd_quota_inode)) {
 495                 error = PTR_ERR(sdp->sd_quota_inode);
 496                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 497                 goto fail_rindex;
 498         }
 499         return 0;
 500
 501 fail_qinode:
 502         iput(sdp->sd_quota_inode);
 503 fail_rindex:
 504         gfs2_clear_rgrpd(sdp);
 505         iput(sdp->sd_rindex);
 506 fail_statfs:
 507         iput(sdp->sd_statfs_inode);
 508 fail_inum:
 509         iput(sdp->sd_inum_inode);
 510 fail_journal:
 511         init_journal(sdp, UNDO);
 512 fail_master:
 513         iput(sdp->sd_master_dir);
 514 fail:
 515         return error;
 516 }
 517
 518 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 519 {
 520         struct inode *pn = NULL;
 521         char buf[30];
 522         int error = 0;
 523         struct gfs2_inode *ip;
 524
 525         if (sdp->sd_args.ar_spectator)
 526                 return 0;
 527
 528         if (undo)
 529                 goto fail_qc_gh;
 530
 531         pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
 532         if (IS_ERR(pn)) {
 533                 error = PTR_ERR(pn);
 534                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 535                 return error;
 536         }
 537
 538         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 539         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 540         if (IS_ERR(sdp->sd_ir_inode)) {
 541                 error = PTR_ERR(sdp->sd_ir_inode);
 542                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 543                 goto fail;
 544         }
 545
 546         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 547         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 548         if (IS_ERR(sdp->sd_sc_inode)) {
 549                 error = PTR_ERR(sdp->sd_sc_inode);
 550                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 551                 goto fail_ir_i;
 552         }
 553
 554         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 555         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 556         if (IS_ERR(sdp->sd_qc_inode)) {
 557                 error = PTR_ERR(sdp->sd_qc_inode);
 558                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 559                 goto fail_ut_i;
 560         }
 561
 562         iput(pn);
 563         pn = NULL;
 564
 565         ip = GFS2_I(sdp->sd_ir_inode);
 566         error = gfs2_glock_nq_init(ip->i_gl,
 567                                    LM_ST_EXCLUSIVE, 0,
 568                                    &sdp->sd_ir_gh);
 569         if (error) {
 570                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 571                 goto fail_qc_i;
 572         }
 573
 574         ip = GFS2_I(sdp->sd_sc_inode);
 575         error = gfs2_glock_nq_init(ip->i_gl,
 576                                    LM_ST_EXCLUSIVE, 0,
 577                                    &sdp->sd_sc_gh);
 578         if (error) {
 579                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 580                 goto fail_ir_gh;
 581         }
 582
 583         ip = GFS2_I(sdp->sd_qc_inode);
 584         error = gfs2_glock_nq_init(ip->i_gl,
 585                                    LM_ST_EXCLUSIVE, 0,
 586                                    &sdp->sd_qc_gh);
 587         if (error) {
 588                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 589                 goto fail_ut_gh;
 590         }
 591
 592         return 0;
 593
 594 fail_qc_gh:
 595         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 596 fail_ut_gh:
 597         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 598 fail_ir_gh:
 599         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 600 fail_qc_i:
 601         iput(sdp->sd_qc_inode);
 602 fail_ut_i:
 603         iput(sdp->sd_sc_inode);
 604 fail_ir_i:
 605         iput(sdp->sd_ir_inode);
 606 fail:
 607         if (pn)
 608                 iput(pn);
 609         return error;
 610 }
 611
 612 static int init_threads(struct gfs2_sbd *sdp, int undo)
 613 {
 614         struct task_struct *p;
 615         int error = 0;
 616
 617         if (undo)
 618                 goto fail_quotad;
 619
 620         sdp->sd_log_flush_time = jiffies;
 621         sdp->sd_jindex_refresh_time = jiffies;
 622
 623         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 624         error = IS_ERR(p);
 625         if (error) {
 626                 fs_err(sdp, "can't start logd thread: %d\n", error);
 627                 return error;
 628         }
 629         sdp->sd_logd_process = p;
 630
 631         sdp->sd_statfs_sync_time = jiffies;
 632         sdp->sd_quota_sync_time = jiffies;
 633
 634         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 635         error = IS_ERR(p);
 636         if (error) {
 637                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 638                 goto fail;
 639         }
 640         sdp->sd_quotad_process = p;
 641
 642         return 0;
 643
 644
 645 fail_quotad:
 646         kthread_stop(sdp->sd_quotad_process);
 647 fail:
 648         kthread_stop(sdp->sd_logd_process);
 649         return error;
 650 }
 651
 652 /**
 653  * fill_super - Read in superblock
 654  * @sb: The VFS superblock
 655  * @data: Mount options
 656  * @silent: Don't complain if it's not a GFS2 filesystem
 657  *
 658  * Returns: errno
 659  */
 660
 661 static int fill_super(struct super_block *sb, void *data, int silent)
 662 {
 663         struct gfs2_sbd *sdp;
 664         struct gfs2_holder mount_gh;
 665         int error;
 666
 667         sdp = init_sbd(sb);
 668         if (!sdp) {
 669                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
 670                 return -ENOMEM;
 671         }
 672
 673         error = gfs2_mount_args(sdp, (char *)data, 0);
 674         if (error) {
 675                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
 676                 goto fail;
 677         }
 678
 679         init_vfs(sb, SDF_NOATIME);
 680
 681         /* Set up the buffer cache and fill in some fake block size values
 682            to allow us to read-in the on-disk superblock. */
 683         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
 684         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
 685         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 686                                GFS2_BASIC_BLOCK_SHIFT;
 687         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 688
 689         error = init_names(sdp, silent);
 690         if (error)
 691                 goto fail;
 692
 693         gfs2_create_debugfs_file(sdp);
 694
 695         error = gfs2_sys_fs_add(sdp);
 696         if (error)
 697                 goto fail;
 698
 699         error = gfs2_lm_mount(sdp, silent);
 700         if (error)
 701                 goto fail_sys;
 702
 703         error = init_locking(sdp, &mount_gh, DO);
 704         if (error)
 705                 goto fail_lm;
 706
 707         error = init_sb(sdp, silent, DO);
 708         if (error)
 709                 goto fail_locking;
 710
 711         error = init_inodes(sdp, DO);
 712         if (error)
 713                 goto fail_sb;
 714
 715         error = init_per_node(sdp, DO);
 716         if (error)
 717                 goto fail_inodes;
 718
 719         error = gfs2_statfs_init(sdp);
 720         if (error) {
 721                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
 722                 goto fail_per_node;
 723         }
 724
 725         error = init_threads(sdp, DO);
 726         if (error)
 727                 goto fail_per_node;
 728
 729         if (!(sb->s_flags & MS_RDONLY)) {
 730                 error = gfs2_make_fs_rw(sdp);
 731                 if (error) {
 732                         fs_err(sdp, "can't make FS RW: %d\n", error);
 733                         goto fail_threads;
 734                 }
 735         }
 736
 737         gfs2_glock_dq_uninit(&mount_gh);
 738
 739         return 0;
 740
 741 fail_threads:
 742         init_threads(sdp, UNDO);
 743 fail_per_node:
 744         init_per_node(sdp, UNDO);
 745 fail_inodes:
 746         init_inodes(sdp, UNDO);
 747 fail_sb:
 748         init_sb(sdp, 0, UNDO);
 749 fail_locking:
 750         init_locking(sdp, &mount_gh, UNDO);
 751 fail_lm:
 752         gfs2_gl_hash_clear(sdp, WAIT);
 753         gfs2_lm_unmount(sdp);
 754         while (invalidate_inodes(sb))
 755                 yield();
 756 fail_sys:
 757         gfs2_sys_fs_del(sdp);
 758 fail:
 759         kfree(sdp);
 760         sb->s_fs_info = NULL;
 761         return error;
 762 }
 763
 764 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
 765                 const char *dev_name, void *data, struct vfsmount *mnt)
 766 {
 767         struct super_block *sb;
 768         struct gfs2_sbd *sdp;
 769         int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
 770         if (error)
 771                 goto out;
 772         sb = mnt->mnt_sb;
 773         sdp = sb->s_fs_info;
 774         sdp->sd_gfs2mnt = mnt;
 775 out:
 776         return error;
 777 }
 778
 779 static int fill_super_meta(struct super_block *sb, struct super_block *new,
 780                            void *data, int silent)
 781 {
 782         struct gfs2_sbd *sdp = sb->s_fs_info;
 783         struct inode *inode;
 784         int error = 0;
 785
 786         new->s_fs_info = sdp;
 787         sdp->sd_vfs_meta = sb;
 788
 789         init_vfs(new, SDF_NOATIME);
 790
 791         /* Get the master inode */
 792         inode = igrab(sdp->sd_master_dir);
 793
 794         new->s_root = d_alloc_root(inode);
 795         if (!new->s_root) {
 796                 fs_err(sdp, "can't get root dentry\n");
 797                 error = -ENOMEM;
 798                 iput(inode);
 799         } else
 800                 new->s_root->d_op = &gfs2_dops;
 801
 802         return error;
 803 }
 804
 805 static int set_bdev_super(struct super_block *s, void *data)
 806 {
 807         s->s_bdev = data;
 808         s->s_dev = s->s_bdev->bd_dev;
 809         return 0;
 810 }
 811
 812 static int test_bdev_super(struct super_block *s, void *data)
 813 {
 814         return s->s_bdev == data;
 815 }
 816
 817 static struct super_block* get_gfs2_sb(const char *dev_name)
 818 {
 819         struct kstat stat;
 820         struct nameidata nd;
 821         struct file_system_type *fstype;
 822         struct super_block *sb = NULL, *s;
 823         struct list_head *l;
 824         int error;
 825
 826         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
 827         if (error) {
 828                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
 829                        dev_name);
 830                 goto out;
 831         }
 832         error = vfs_getattr(nd.mnt, nd.dentry, &stat);
 833
 834         fstype = get_fs_type("gfs2");
 835         list_for_each(l, &fstype->fs_supers) {
 836                 s = list_entry(l, struct super_block, s_instances);
 837                 if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
 838                     (S_ISDIR(stat.mode) && s == nd.dentry->d_inode->i_sb)) {
 839                         sb = s;
 840                         goto free_nd;
 841                 }
 842         }
 843
 844         printk(KERN_WARNING "GFS2: Unrecognized block device or "
 845                "mount point %s\n", dev_name);
 846
 847 free_nd:
 848         path_release(&nd);
 849 out:
 850         return sb;
 851 }
 852
 853 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
 854                             const char *dev_name, void *data, struct vfsmount *mnt)
 855 {
 856         int error = 0;
 857         struct super_block *sb = NULL, *new;
 858         struct gfs2_sbd *sdp;
 859
 860         sb = get_gfs2_sb(dev_name);
 861         if (!sb) {
 862                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
 863                 error = -ENOENT;
 864                 goto error;
 865         }
 866         sdp = (struct gfs2_sbd*) sb->s_fs_info;
 867         if (sdp->sd_vfs_meta) {
 868                 printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
 869                 error = -EBUSY;
 870                 goto error;
 871         }
 872         down(&sb->s_bdev->bd_mount_sem);
 873         new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
 874         up(&sb->s_bdev->bd_mount_sem);
 875         if (IS_ERR(new)) {
 876                 error = PTR_ERR(new);
 877                 goto error;
 878         }
 879         module_put(fs_type->owner);
 880         new->s_flags = flags;
 881         strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
 882         sb_set_blocksize(new, sb->s_blocksize);
 883         error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
 884         if (error) {
 885                 up_write(&new->s_umount);
 886                 deactivate_super(new);
 887                 goto error;
 888         }
 889
 890         new->s_flags |= MS_ACTIVE;
 891
 892         /* Grab a reference to the gfs2 mount point */
 893         atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
 894         return simple_set_mnt(mnt, new);
 895 error:
 896         return error;
 897 }
 898
 899 static void gfs2_kill_sb(struct super_block *sb)
 900 {
 901         gfs2_delete_debugfs_file(sb->s_fs_info);
 902         kill_block_super(sb);
 903 }
 904
 905 static void gfs2_kill_sb_meta(struct super_block *sb)
 906 {
 907         struct gfs2_sbd *sdp = sb->s_fs_info;
 908         generic_shutdown_super(sb);
 909         sdp->sd_vfs_meta = NULL;
 910         atomic_dec(&sdp->sd_gfs2mnt->mnt_count);
 911 }
 912
 913 struct file_system_type gfs2_fs_type = {
 914         .name = "gfs2",
 915         .fs_flags = FS_REQUIRES_DEV,
 916         .get_sb = gfs2_get_sb,
 917         .kill_sb = gfs2_kill_sb,
 918         .owner = THIS_MODULE,
 919 };
 920
 921 struct file_system_type gfs2meta_fs_type = {
 922         .name = "gfs2meta",
 923         .fs_flags = FS_REQUIRES_DEV,
 924         .get_sb = gfs2_get_sb_meta,
 925         .kill_sb = gfs2_kill_sb_meta,
 926         .owner = THIS_MODULE,
 927 };
 928