fs/gfs2/ops_super.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/statfs.h>
  16 #include <linux/seq_file.h>
  17 #include <linux/mount.h>
  18 #include <linux/kthread.h>
  19 #include <linux/delay.h>
  20 #include <linux/gfs2_ondisk.h>
  21 #include <linux/crc32.h>
  22 #include <linux/lm_interface.h>
  23
  24 #include "gfs2.h"
  25 #include "incore.h"
  26 #include "glock.h"
  27 #include "inode.h"
  28 #include "lm.h"
  29 #include "log.h"
  30 #include "mount.h"
  31 #include "ops_super.h"
  32 #include "quota.h"
  33 #include "recovery.h"
  34 #include "rgrp.h"
  35 #include "super.h"
  36 #include "sys.h"
  37 #include "util.h"
  38 #include "trans.h"
  39 #include "dir.h"
  40 #include "eattr.h"
  41 #include "bmap.h"
  42
  43 /**
  44  * gfs2_write_inode - Make sure the inode is stable on the disk
  45  * @inode: The inode
  46  * @sync: synchronous write flag
  47  *
  48  * Returns: errno
  49  */
  50
  51 static int gfs2_write_inode(struct inode *inode, int sync)
  52 {
  53         struct gfs2_inode *ip = GFS2_I(inode);
  54
  55         /* Check this is a "normal" inode */
  56         if (inode->i_private) {
  57                 if (current->flags & PF_MEMALLOC)
  58                         return 0;
  59                 if (sync)
  60                         gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
  61         }
  62
  63         return 0;
  64 }
  65
  66 /**
  67  * gfs2_put_super - Unmount the filesystem
  68  * @sb: The VFS superblock
  69  *
  70  */
  71
  72 static void gfs2_put_super(struct super_block *sb)
  73 {
  74         struct gfs2_sbd *sdp = sb->s_fs_info;
  75         int error;
  76
  77         if (!sdp)
  78                 return;
  79
  80         if (!strncmp(sb->s_type->name, "gfs2meta", 8))
  81                 return; /* Nothing to do */
  82
  83         /*  Unfreeze the filesystem, if we need to  */
  84
  85         mutex_lock(&sdp->sd_freeze_lock);
  86         if (sdp->sd_freeze_count)
  87                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
  88         mutex_unlock(&sdp->sd_freeze_lock);
  89
  90         kthread_stop(sdp->sd_quotad_process);
  91         kthread_stop(sdp->sd_logd_process);
  92         kthread_stop(sdp->sd_recoverd_process);
  93         while (sdp->sd_glockd_num--)
  94                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
  95         kthread_stop(sdp->sd_scand_process);
  96
  97         if (!(sb->s_flags & MS_RDONLY)) {
  98                 error = gfs2_make_fs_ro(sdp);
  99                 if (error)
 100                         gfs2_io_error(sdp);
 101         }
 102         /*  At this point, we're through modifying the disk  */
 103
 104         /*  Release stuff  */
 105
 106         iput(sdp->sd_master_dir);
 107         iput(sdp->sd_jindex);
 108         iput(sdp->sd_inum_inode);
 109         iput(sdp->sd_statfs_inode);
 110         iput(sdp->sd_rindex);
 111         iput(sdp->sd_quota_inode);
 112
 113         gfs2_glock_put(sdp->sd_rename_gl);
 114         gfs2_glock_put(sdp->sd_trans_gl);
 115
 116         if (!sdp->sd_args.ar_spectator) {
 117                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 118                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 119                 gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 120                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 121                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 122                 iput(sdp->sd_ir_inode);
 123                 iput(sdp->sd_sc_inode);
 124                 iput(sdp->sd_qc_inode);
 125         }
 126
 127         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 128         gfs2_clear_rgrpd(sdp);
 129         gfs2_jindex_free(sdp);
 130         /*  Take apart glock structures and buffer lists  */
 131         gfs2_gl_hash_clear(sdp, WAIT);
 132         /*  Unmount the locking protocol  */
 133         gfs2_lm_unmount(sdp);
 134
 135         /*  At this point, we're through participating in the lockspace  */
 136         gfs2_sys_fs_del(sdp);
 137         kfree(sdp);
 138 }
 139
 140 /**
 141  * gfs2_write_super
 142  * @sb: the superblock
 143  *
 144  */
 145
 146 static void gfs2_write_super(struct super_block *sb)
 147 {
 148         sb->s_dirt = 0;
 149 }
 150
 151 /**
 152  * gfs2_sync_fs - sync the filesystem
 153  * @sb: the superblock
 154  *
 155  * Flushes the log to disk.
 156  */
 157 static int gfs2_sync_fs(struct super_block *sb, int wait)
 158 {
 159         sb->s_dirt = 0;
 160         gfs2_log_flush(sb->s_fs_info, NULL);
 161         return 0;
 162 }
 163
 164 /**
 165  * gfs2_write_super_lockfs - prevent further writes to the filesystem
 166  * @sb: the VFS structure for the filesystem
 167  *
 168  */
 169
 170 static void gfs2_write_super_lockfs(struct super_block *sb)
 171 {
 172         struct gfs2_sbd *sdp = sb->s_fs_info;
 173         int error;
 174
 175         for (;;) {
 176                 error = gfs2_freeze_fs(sdp);
 177                 if (!error)
 178                         break;
 179
 180                 switch (error) {
 181                 case -EBUSY:
 182                         fs_err(sdp, "waiting for recovery before freeze\n");
 183                         break;
 184
 185                 default:
 186                         fs_err(sdp, "error freezing FS: %d\n", error);
 187                         break;
 188                 }
 189
 190                 fs_err(sdp, "retrying...\n");
 191                 msleep(1000);
 192         }
 193 }
 194
 195 /**
 196  * gfs2_unlockfs - reallow writes to the filesystem
 197  * @sb: the VFS structure for the filesystem
 198  *
 199  */
 200
 201 static void gfs2_unlockfs(struct super_block *sb)
 202 {
 203         gfs2_unfreeze_fs(sb->s_fs_info);
 204 }
 205
 206 /**
 207  * gfs2_statfs - Gather and return stats about the filesystem
 208  * @sb: The superblock
 209  * @statfsbuf: The buffer
 210  *
 211  * Returns: 0 on success or error code
 212  */
 213
 214 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
 215 {
 216         struct super_block *sb = dentry->d_inode->i_sb;
 217         struct gfs2_sbd *sdp = sb->s_fs_info;
 218         struct gfs2_statfs_change sc;
 219         int error;
 220
 221         if (gfs2_tune_get(sdp, gt_statfs_slow))
 222                 error = gfs2_statfs_slow(sdp, &sc);
 223         else
 224                 error = gfs2_statfs_i(sdp, &sc);
 225
 226         if (error)
 227                 return error;
 228
 229         buf->f_type = GFS2_MAGIC;
 230         buf->f_bsize = sdp->sd_sb.sb_bsize;
 231         buf->f_blocks = sc.sc_total;
 232         buf->f_bfree = sc.sc_free;
 233         buf->f_bavail = sc.sc_free;
 234         buf->f_files = sc.sc_dinodes + sc.sc_free;
 235         buf->f_ffree = sc.sc_free;
 236         buf->f_namelen = GFS2_FNAMESIZE;
 237
 238         return 0;
 239 }
 240
 241 /**
 242  * gfs2_remount_fs - called when the FS is remounted
 243  * @sb:  the filesystem
 244  * @flags:  the remount flags
 245  * @data:  extra data passed in (not used right now)
 246  *
 247  * Returns: errno
 248  */
 249
 250 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
 251 {
 252         struct gfs2_sbd *sdp = sb->s_fs_info;
 253         int error;
 254
 255         error = gfs2_mount_args(sdp, data, 1);
 256         if (error)
 257                 return error;
 258
 259         if (sdp->sd_args.ar_spectator)
 260                 *flags |= MS_RDONLY;
 261         else {
 262                 if (*flags & MS_RDONLY) {
 263                         if (!(sb->s_flags & MS_RDONLY))
 264                                 error = gfs2_make_fs_ro(sdp);
 265                 } else if (!(*flags & MS_RDONLY) &&
 266                            (sb->s_flags & MS_RDONLY)) {
 267                         error = gfs2_make_fs_rw(sdp);
 268                 }
 269         }
 270
 271         if (*flags & (MS_NOATIME | MS_NODIRATIME))
 272                 set_bit(SDF_NOATIME, &sdp->sd_flags);
 273         else
 274                 clear_bit(SDF_NOATIME, &sdp->sd_flags);
 275
 276         /* Don't let the VFS update atimes.  GFS2 handles this itself. */
 277         *flags |= MS_NOATIME | MS_NODIRATIME;
 278
 279         return error;
 280 }
 281
 282 /**
 283  * gfs2_clear_inode - Deallocate an inode when VFS is done with it
 284  * @inode: The VFS inode
 285  *
 286  */
 287
 288 static void gfs2_clear_inode(struct inode *inode)
 289 {
 290         /* This tells us its a "real" inode and not one which only
 291          * serves to contain an address space (see rgrp.c, meta_io.c)
 292          * which therefore doesn't have its own glocks.
 293          */
 294         if (inode->i_private) {
 295                 struct gfs2_inode *ip = GFS2_I(inode);
 296                 gfs2_glock_inode_squish(inode);
 297                 gfs2_assert(inode->i_sb->s_fs_info, ip->i_gl->gl_state == LM_ST_UNLOCKED);
 298                 ip->i_gl->gl_object = NULL;
 299                 gfs2_glock_schedule_for_reclaim(ip->i_gl);
 300                 gfs2_glock_put(ip->i_gl);
 301                 ip->i_gl = NULL;
 302                 if (ip->i_iopen_gh.gh_gl)
 303                         gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 304         }
 305 }
 306
 307 /**
 308  * gfs2_show_options - Show mount options for /proc/mounts
 309  * @s: seq_file structure
 310  * @mnt: vfsmount
 311  *
 312  * Returns: 0 on success or error code
 313  */
 314
 315 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
 316 {
 317         struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
 318         struct gfs2_args *args = &sdp->sd_args;
 319
 320         if (args->ar_lockproto[0])
 321                 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
 322         if (args->ar_locktable[0])
 323                 seq_printf(s, ",locktable=%s", args->ar_locktable);
 324         if (args->ar_hostdata[0])
 325                 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
 326         if (args->ar_spectator)
 327                 seq_printf(s, ",spectator");
 328         if (args->ar_ignore_local_fs)
 329                 seq_printf(s, ",ignore_local_fs");
 330         if (args->ar_localflocks)
 331                 seq_printf(s, ",localflocks");
 332         if (args->ar_localcaching)
 333                 seq_printf(s, ",localcaching");
 334         if (args->ar_debug)
 335                 seq_printf(s, ",debug");
 336         if (args->ar_upgrade)
 337                 seq_printf(s, ",upgrade");
 338         if (args->ar_num_glockd != GFS2_GLOCKD_DEFAULT)
 339                 seq_printf(s, ",num_glockd=%u", args->ar_num_glockd);
 340         if (args->ar_posix_acl)
 341                 seq_printf(s, ",acl");
 342         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
 343                 char *state;
 344                 switch (args->ar_quota) {
 345                 case GFS2_QUOTA_OFF:
 346                         state = "off";
 347                         break;
 348                 case GFS2_QUOTA_ACCOUNT:
 349                         state = "account";
 350                         break;
 351                 case GFS2_QUOTA_ON:
 352                         state = "on";
 353                         break;
 354                 default:
 355                         state = "unknown";
 356                         break;
 357                 }
 358                 seq_printf(s, ",quota=%s", state);
 359         }
 360         if (args->ar_suiddir)
 361                 seq_printf(s, ",suiddir");
 362         if (args->ar_data != GFS2_DATA_DEFAULT) {
 363                 char *state;
 364                 switch (args->ar_data) {
 365                 case GFS2_DATA_WRITEBACK:
 366                         state = "writeback";
 367                         break;
 368                 case GFS2_DATA_ORDERED:
 369                         state = "ordered";
 370                         break;
 371                 default:
 372                         state = "unknown";
 373                         break;
 374                 }
 375                 seq_printf(s, ",data=%s", state);
 376         }
 377
 378         return 0;
 379 }
 380
 381 /*
 382  * We have to (at the moment) hold the inodes main lock to cover
 383  * the gap between unlocking the shared lock on the iopen lock and
 384  * taking the exclusive lock. I'd rather do a shared -> exclusive
 385  * conversion on the iopen lock, but we can change that later. This
 386  * is safe, just less efficient.
 387  */
 388 static void gfs2_delete_inode(struct inode *inode)
 389 {
 390         struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
 391         struct gfs2_inode *ip = GFS2_I(inode);
 392         struct gfs2_holder gh;
 393         int error;
 394
 395         if (!inode->i_private)
 396                 goto out;
 397
 398         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &gh);
 399         if (unlikely(error)) {
 400                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 401                 goto out;
 402         }
 403
 404         gfs2_glock_dq(&ip->i_iopen_gh);
 405         gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
 406         error = gfs2_glock_nq(&ip->i_iopen_gh);
 407         if (error)
 408                 goto out_uninit;
 409
 410         if (S_ISDIR(ip->i_di.di_mode) &&
 411             (ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
 412                 error = gfs2_dir_exhash_dealloc(ip);
 413                 if (error)
 414                         goto out_unlock;
 415         }
 416
 417         if (ip->i_di.di_eattr) {
 418                 error = gfs2_ea_dealloc(ip);
 419                 if (error)
 420                         goto out_unlock;
 421         }
 422
 423         if (!gfs2_is_stuffed(ip)) {
 424                 error = gfs2_file_dealloc(ip);
 425                 if (error)
 426                         goto out_unlock;
 427         }
 428
 429         error = gfs2_dinode_dealloc(ip);
 430
 431 out_unlock:
 432         gfs2_glock_dq(&ip->i_iopen_gh);
 433 out_uninit:
 434         gfs2_holder_uninit(&ip->i_iopen_gh);
 435         gfs2_glock_dq_uninit(&gh);
 436         if (error)
 437                 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
 438 out:
 439         truncate_inode_pages(&inode->i_data, 0);
 440         clear_inode(inode);
 441 }
 442
 443
 444
 445 static struct inode *gfs2_alloc_inode(struct super_block *sb)
 446 {
 447         struct gfs2_sbd *sdp = sb->s_fs_info;
 448         struct gfs2_inode *ip;
 449
 450         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
 451         if (ip) {
 452                 ip->i_flags = 0;
 453                 ip->i_gl = NULL;
 454                 ip->i_greedy = gfs2_tune_get(sdp, gt_greedy_default);
 455                 ip->i_last_pfault = jiffies;
 456         }
 457         return &ip->i_inode;
 458 }
 459
 460 static void gfs2_destroy_inode(struct inode *inode)
 461 {
 462         kmem_cache_free(gfs2_inode_cachep, inode);
 463 }
 464
 465 struct super_operations gfs2_super_ops = {
 466         .alloc_inode            = gfs2_alloc_inode,
 467         .destroy_inode          = gfs2_destroy_inode,
 468         .write_inode            = gfs2_write_inode,
 469         .delete_inode           = gfs2_delete_inode,
 470         .put_super              = gfs2_put_super,
 471         .write_super            = gfs2_write_super,
 472         .sync_fs                = gfs2_sync_fs,
 473         .write_super_lockfs     = gfs2_write_super_lockfs,
 474         .unlockfs               = gfs2_unlockfs,
 475         .statfs                 = gfs2_statfs,
 476         .remount_fs             = gfs2_remount_fs,
 477         .clear_inode            = gfs2_clear_inode,
 478         .show_options           = gfs2_show_options,
 479 };
 480