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         table = sdp->sd_table_name;
 148         while ((table = strchr(table, '/')))
 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         for (sdp->sd_glockd_num = 0;
 165              sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
 166              sdp->sd_glockd_num++) {
 167                 p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
 168                 error = IS_ERR(p);
 169                 if (error) {
 170                         fs_err(sdp, "can't start glockd thread: %d\n", error);
 171                         goto fail;
 172                 }
 173                 sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
 174         }
 175
 176         error = gfs2_glock_nq_num(sdp,
 177                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 178                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 179                                   mount_gh);
 180         if (error) {
 181                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 182                 goto fail;
 183         }
 184
 185         error = gfs2_glock_nq_num(sdp,
 186                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 187                                   LM_ST_SHARED,
 188                                   LM_FLAG_NOEXP | GL_EXACT,
 189                                   &sdp->sd_live_gh);
 190         if (error) {
 191                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 192                 goto fail_mount;
 193         }
 194
 195         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 196                                CREATE, &sdp->sd_rename_gl);
 197         if (error) {
 198                 fs_err(sdp, "can't create rename glock: %d\n", error);
 199                 goto fail_live;
 200         }
 201
 202         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 203                                CREATE, &sdp->sd_trans_gl);
 204         if (error) {
 205                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 206                 goto fail_rename;
 207         }
 208         set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
 209
 210         return 0;
 211
 212 fail_trans:
 213         gfs2_glock_put(sdp->sd_trans_gl);
 214 fail_rename:
 215         gfs2_glock_put(sdp->sd_rename_gl);
 216 fail_live:
 217         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 218 fail_mount:
 219         gfs2_glock_dq_uninit(mount_gh);
 220 fail:
 221         while (sdp->sd_glockd_num--)
 222                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
 223
 224         return error;
 225 }
 226
 227 static inline struct inode *gfs2_lookup_root(struct super_block *sb,
 228                                              u64 no_addr)
 229 {
 230         return gfs2_inode_lookup(sb, DT_DIR, no_addr, 0);
 231 }
 232
 233 static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
 234 {
 235         struct super_block *sb = sdp->sd_vfs;
 236         struct gfs2_holder sb_gh;
 237         u64 no_addr;
 238         struct inode *inode;
 239         int error = 0;
 240
 241         if (undo) {
 242                 if (sb->s_root) {
 243                         dput(sb->s_root);
 244                         sb->s_root = NULL;
 245                 }
 246                 return 0;
 247         }
 248
 249         error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 250                                  LM_ST_SHARED, 0, &sb_gh);
 251         if (error) {
 252                 fs_err(sdp, "can't acquire superblock glock: %d\n", error);
 253                 return error;
 254         }
 255
 256         error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
 257         if (error) {
 258                 fs_err(sdp, "can't read superblock: %d\n", error);
 259                 goto out;
 260         }
 261
 262         /* Set up the buffer cache and SB for real */
 263         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
 264                 error = -EINVAL;
 265                 fs_err(sdp, "FS block size (%u) is too small for device "
 266                        "block size (%u)\n",
 267                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
 268                 goto out;
 269         }
 270         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 271                 error = -EINVAL;
 272                 fs_err(sdp, "FS block size (%u) is too big for machine "
 273                        "page size (%u)\n",
 274                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 275                 goto out;
 276         }
 277         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 278
 279         /* Get the root inode */
 280         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 281         if (sb->s_type == &gfs2meta_fs_type)
 282                 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 283         inode = gfs2_lookup_root(sb, no_addr);
 284         if (IS_ERR(inode)) {
 285                 error = PTR_ERR(inode);
 286                 fs_err(sdp, "can't read in root inode: %d\n", error);
 287                 goto out;
 288         }
 289
 290         sb->s_root = d_alloc_root(inode);
 291         if (!sb->s_root) {
 292                 fs_err(sdp, "can't get root dentry\n");
 293                 error = -ENOMEM;
 294                 iput(inode);
 295         } else
 296                 sb->s_root->d_op = &gfs2_dops;
 297
 298 out:
 299         gfs2_glock_dq_uninit(&sb_gh);
 300         return error;
 301 }
 302
 303 static int init_journal(struct gfs2_sbd *sdp, int undo)
 304 {
 305         struct gfs2_holder ji_gh;
 306         struct task_struct *p;
 307         struct gfs2_inode *ip;
 308         int jindex = 1;
 309         int error = 0;
 310
 311         if (undo) {
 312                 jindex = 0;
 313                 goto fail_recoverd;
 314         }
 315
 316         sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
 317         if (IS_ERR(sdp->sd_jindex)) {
 318                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 319                 return PTR_ERR(sdp->sd_jindex);
 320         }
 321         ip = GFS2_I(sdp->sd_jindex);
 322         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 323
 324         /* Load in the journal index special file */
 325
 326         error = gfs2_jindex_hold(sdp, &ji_gh);
 327         if (error) {
 328                 fs_err(sdp, "can't read journal index: %d\n", error);
 329                 goto fail;
 330         }
 331
 332         error = -EINVAL;
 333         if (!gfs2_jindex_size(sdp)) {
 334                 fs_err(sdp, "no journals!\n");
 335                 goto fail_jindex;
 336         }
 337
 338         if (sdp->sd_args.ar_spectator) {
 339                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 340                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 341         } else {
 342                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 343                         fs_err(sdp, "can't mount journal #%u\n",
 344                                sdp->sd_lockstruct.ls_jid);
 345                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 346                                gfs2_jindex_size(sdp),
 347                                gfs2_jindex_size(sdp) - 1);
 348                         goto fail_jindex;
 349                 }
 350                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 351
 352                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 353                                           &gfs2_journal_glops,
 354                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 355                                           &sdp->sd_journal_gh);
 356                 if (error) {
 357                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 358                         goto fail_jindex;
 359                 }
 360
 361                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 362                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 363                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 364                                            &sdp->sd_jinode_gh);
 365                 if (error) {
 366                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 367                                error);
 368                         goto fail_journal_gh;
 369                 }
 370
 371                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 372                 if (error) {
 373                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 374                                sdp->sd_jdesc->jd_jid, error);
 375                         goto fail_jinode_gh;
 376                 }
 377                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 378         }
 379
 380         if (sdp->sd_lockstruct.ls_first) {
 381                 unsigned int x;
 382                 for (x = 0; x < sdp->sd_journals; x++) {
 383                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 384                         if (error) {
 385                                 fs_err(sdp, "error recovering journal %u: %d\n",
 386                                        x, error);
 387                                 goto fail_jinode_gh;
 388                         }
 389                 }
 390
 391                 gfs2_lm_others_may_mount(sdp);
 392         } else if (!sdp->sd_args.ar_spectator) {
 393                 error = gfs2_recover_journal(sdp->sd_jdesc);
 394                 if (error) {
 395                         fs_err(sdp, "error recovering my journal: %d\n", error);
 396                         goto fail_jinode_gh;
 397                 }
 398         }
 399
 400         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 401         gfs2_glock_dq_uninit(&ji_gh);
 402         jindex = 0;
 403
 404         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 405         error = IS_ERR(p);
 406         if (error) {
 407                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
 408                 goto fail_jinode_gh;
 409         }
 410         sdp->sd_recoverd_process = p;
 411
 412         return 0;
 413
 414 fail_recoverd:
 415         kthread_stop(sdp->sd_recoverd_process);
 416 fail_jinode_gh:
 417         if (!sdp->sd_args.ar_spectator)
 418                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 419 fail_journal_gh:
 420         if (!sdp->sd_args.ar_spectator)
 421                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 422 fail_jindex:
 423         gfs2_jindex_free(sdp);
 424         if (jindex)
 425                 gfs2_glock_dq_uninit(&ji_gh);
 426 fail:
 427         iput(sdp->sd_jindex);
 428         return error;
 429 }
 430
 431
 432 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 433 {
 434         int error = 0;
 435         struct gfs2_inode *ip;
 436         struct inode *inode;
 437
 438         if (undo)
 439                 goto fail_qinode;
 440
 441         inode = gfs2_lookup_root(sdp->sd_vfs, sdp->sd_sb.sb_master_dir.no_addr);
 442         if (IS_ERR(inode)) {
 443                 error = PTR_ERR(inode);
 444                 fs_err(sdp, "can't read in master directory: %d\n", error);
 445                 goto fail;
 446         }
 447         sdp->sd_master_dir = inode;
 448
 449         error = init_journal(sdp, undo);
 450         if (error)
 451                 goto fail_master;
 452
 453         /* Read in the master inode number inode */
 454         sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
 455         if (IS_ERR(sdp->sd_inum_inode)) {
 456                 error = PTR_ERR(sdp->sd_inum_inode);
 457                 fs_err(sdp, "can't read in inum inode: %d\n", error);
 458                 goto fail_journal;
 459         }
 460
 461
 462         /* Read in the master statfs inode */
 463         sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
 464         if (IS_ERR(sdp->sd_statfs_inode)) {
 465                 error = PTR_ERR(sdp->sd_statfs_inode);
 466                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 467                 goto fail_inum;
 468         }
 469
 470         /* Read in the resource index inode */
 471         sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
 472         if (IS_ERR(sdp->sd_rindex)) {
 473                 error = PTR_ERR(sdp->sd_rindex);
 474                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 475                 goto fail_statfs;
 476         }
 477         ip = GFS2_I(sdp->sd_rindex);
 478         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 479         sdp->sd_rindex_vn = ip->i_gl->gl_vn - 1;
 480
 481         /* Read in the quota inode */
 482         sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
 483         if (IS_ERR(sdp->sd_quota_inode)) {
 484                 error = PTR_ERR(sdp->sd_quota_inode);
 485                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 486                 goto fail_rindex;
 487         }
 488         return 0;
 489
 490 fail_qinode:
 491         iput(sdp->sd_quota_inode);
 492 fail_rindex:
 493         gfs2_clear_rgrpd(sdp);
 494         iput(sdp->sd_rindex);
 495 fail_statfs:
 496         iput(sdp->sd_statfs_inode);
 497 fail_inum:
 498         iput(sdp->sd_inum_inode);
 499 fail_journal:
 500         init_journal(sdp, UNDO);
 501 fail_master:
 502         iput(sdp->sd_master_dir);
 503 fail:
 504         return error;
 505 }
 506
 507 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 508 {
 509         struct inode *pn = NULL;
 510         char buf[30];
 511         int error = 0;
 512         struct gfs2_inode *ip;
 513
 514         if (sdp->sd_args.ar_spectator)
 515                 return 0;
 516
 517         if (undo)
 518                 goto fail_qc_gh;
 519
 520         pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
 521         if (IS_ERR(pn)) {
 522                 error = PTR_ERR(pn);
 523                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 524                 return error;
 525         }
 526
 527         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 528         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 529         if (IS_ERR(sdp->sd_ir_inode)) {
 530                 error = PTR_ERR(sdp->sd_ir_inode);
 531                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 532                 goto fail;
 533         }
 534
 535         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 536         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 537         if (IS_ERR(sdp->sd_sc_inode)) {
 538                 error = PTR_ERR(sdp->sd_sc_inode);
 539                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 540                 goto fail_ir_i;
 541         }
 542
 543         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 544         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 545         if (IS_ERR(sdp->sd_qc_inode)) {
 546                 error = PTR_ERR(sdp->sd_qc_inode);
 547                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 548                 goto fail_ut_i;
 549         }
 550
 551         iput(pn);
 552         pn = NULL;
 553
 554         ip = GFS2_I(sdp->sd_ir_inode);
 555         error = gfs2_glock_nq_init(ip->i_gl,
 556                                    LM_ST_EXCLUSIVE, 0,
 557                                    &sdp->sd_ir_gh);
 558         if (error) {
 559                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 560                 goto fail_qc_i;
 561         }
 562
 563         ip = GFS2_I(sdp->sd_sc_inode);
 564         error = gfs2_glock_nq_init(ip->i_gl,
 565                                    LM_ST_EXCLUSIVE, 0,
 566                                    &sdp->sd_sc_gh);
 567         if (error) {
 568                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 569                 goto fail_ir_gh;
 570         }
 571
 572         ip = GFS2_I(sdp->sd_qc_inode);
 573         error = gfs2_glock_nq_init(ip->i_gl,
 574                                    LM_ST_EXCLUSIVE, 0,
 575                                    &sdp->sd_qc_gh);
 576         if (error) {
 577                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 578                 goto fail_ut_gh;
 579         }
 580
 581         return 0;
 582
 583 fail_qc_gh:
 584         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 585 fail_ut_gh:
 586         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 587 fail_ir_gh:
 588         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 589 fail_qc_i:
 590         iput(sdp->sd_qc_inode);
 591 fail_ut_i:
 592         iput(sdp->sd_sc_inode);
 593 fail_ir_i:
 594         iput(sdp->sd_ir_inode);
 595 fail:
 596         if (pn)
 597                 iput(pn);
 598         return error;
 599 }
 600
 601 static int init_threads(struct gfs2_sbd *sdp, int undo)
 602 {
 603         struct task_struct *p;
 604         int error = 0;
 605
 606         if (undo)
 607                 goto fail_quotad;
 608
 609         sdp->sd_log_flush_time = jiffies;
 610         sdp->sd_jindex_refresh_time = jiffies;
 611
 612         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 613         error = IS_ERR(p);
 614         if (error) {
 615                 fs_err(sdp, "can't start logd thread: %d\n", error);
 616                 return error;
 617         }
 618         sdp->sd_logd_process = p;
 619
 620         sdp->sd_statfs_sync_time = jiffies;
 621         sdp->sd_quota_sync_time = jiffies;
 622
 623         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 624         error = IS_ERR(p);
 625         if (error) {
 626                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 627                 goto fail;
 628         }
 629         sdp->sd_quotad_process = p;
 630
 631         return 0;
 632
 633
 634 fail_quotad:
 635         kthread_stop(sdp->sd_quotad_process);
 636 fail:
 637         kthread_stop(sdp->sd_logd_process);
 638         return error;
 639 }
 640
 641 /**
 642  * fill_super - Read in superblock
 643  * @sb: The VFS superblock
 644  * @data: Mount options
 645  * @silent: Don't complain if it's not a GFS2 filesystem
 646  *
 647  * Returns: errno
 648  */
 649
 650 static int fill_super(struct super_block *sb, void *data, int silent)
 651 {
 652         struct gfs2_sbd *sdp;
 653         struct gfs2_holder mount_gh;
 654         int error;
 655
 656         sdp = init_sbd(sb);
 657         if (!sdp) {
 658                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
 659                 return -ENOMEM;
 660         }
 661
 662         error = gfs2_mount_args(sdp, (char *)data, 0);
 663         if (error) {
 664                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
 665                 goto fail;
 666         }
 667
 668         init_vfs(sb, SDF_NOATIME);
 669
 670         /* Set up the buffer cache and fill in some fake block size values
 671            to allow us to read-in the on-disk superblock. */
 672         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
 673         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
 674         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 675                                GFS2_BASIC_BLOCK_SHIFT;
 676         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 677
 678         error = init_names(sdp, silent);
 679         if (error)
 680                 goto fail;
 681
 682         gfs2_create_debugfs_file(sdp);
 683
 684         error = gfs2_sys_fs_add(sdp);
 685         if (error)
 686                 goto fail;
 687
 688         error = gfs2_lm_mount(sdp, silent);
 689         if (error)
 690                 goto fail_sys;
 691
 692         error = init_locking(sdp, &mount_gh, DO);
 693         if (error)
 694                 goto fail_lm;
 695
 696         error = init_sb(sdp, silent, DO);
 697         if (error)
 698                 goto fail_locking;
 699
 700         error = init_inodes(sdp, DO);
 701         if (error)
 702                 goto fail_sb;
 703
 704         error = init_per_node(sdp, DO);
 705         if (error)
 706                 goto fail_inodes;
 707
 708         error = gfs2_statfs_init(sdp);
 709         if (error) {
 710                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
 711                 goto fail_per_node;
 712         }
 713
 714         error = init_threads(sdp, DO);
 715         if (error)
 716                 goto fail_per_node;
 717
 718         if (!(sb->s_flags & MS_RDONLY)) {
 719                 error = gfs2_make_fs_rw(sdp);
 720                 if (error) {
 721                         fs_err(sdp, "can't make FS RW: %d\n", error);
 722                         goto fail_threads;
 723                 }
 724         }
 725
 726         gfs2_glock_dq_uninit(&mount_gh);
 727
 728         return 0;
 729
 730 fail_threads:
 731         init_threads(sdp, UNDO);
 732 fail_per_node:
 733         init_per_node(sdp, UNDO);
 734 fail_inodes:
 735         init_inodes(sdp, UNDO);
 736 fail_sb:
 737         init_sb(sdp, 0, UNDO);
 738 fail_locking:
 739         init_locking(sdp, &mount_gh, UNDO);
 740 fail_lm:
 741         gfs2_gl_hash_clear(sdp, WAIT);
 742         gfs2_lm_unmount(sdp);
 743         while (invalidate_inodes(sb))
 744                 yield();
 745 fail_sys:
 746         gfs2_sys_fs_del(sdp);
 747 fail:
 748         gfs2_delete_debugfs_file(sdp);
 749         kfree(sdp);
 750         sb->s_fs_info = NULL;
 751         return error;
 752 }
 753
 754 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
 755                 const char *dev_name, void *data, struct vfsmount *mnt)
 756 {
 757         struct super_block *sb;
 758         struct gfs2_sbd *sdp;
 759         int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
 760         if (error)
 761                 goto out;
 762         sb = mnt->mnt_sb;
 763         sdp = sb->s_fs_info;
 764         sdp->sd_gfs2mnt = mnt;
 765 out:
 766         return error;
 767 }
 768
 769 static int fill_super_meta(struct super_block *sb, struct super_block *new,
 770                            void *data, int silent)
 771 {
 772         struct gfs2_sbd *sdp = sb->s_fs_info;
 773         struct inode *inode;
 774         int error = 0;
 775
 776         new->s_fs_info = sdp;
 777         sdp->sd_vfs_meta = sb;
 778
 779         init_vfs(new, SDF_NOATIME);
 780
 781         /* Get the master inode */
 782         inode = igrab(sdp->sd_master_dir);
 783
 784         new->s_root = d_alloc_root(inode);
 785         if (!new->s_root) {
 786                 fs_err(sdp, "can't get root dentry\n");
 787                 error = -ENOMEM;
 788                 iput(inode);
 789         } else
 790                 new->s_root->d_op = &gfs2_dops;
 791
 792         return error;
 793 }
 794
 795 static int set_bdev_super(struct super_block *s, void *data)
 796 {
 797         s->s_bdev = data;
 798         s->s_dev = s->s_bdev->bd_dev;
 799         return 0;
 800 }
 801
 802 static int test_bdev_super(struct super_block *s, void *data)
 803 {
 804         return s->s_bdev == data;
 805 }
 806
 807 static struct super_block* get_gfs2_sb(const char *dev_name)
 808 {
 809         struct kstat stat;
 810         struct nameidata nd;
 811         struct file_system_type *fstype;
 812         struct super_block *sb = NULL, *s;
 813         int error;
 814
 815         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
 816         if (error) {
 817                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
 818                        dev_name);
 819                 goto out;
 820         }
 821         error = vfs_getattr(nd.mnt, nd.dentry, &stat);
 822
 823         fstype = get_fs_type("gfs2");
 824         list_for_each_entry(s, &fstype->fs_supers, 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 = 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