fs/gfs2/ops_super.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2005 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 v.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/vmalloc.h>
  17 #include <linux/seq_file.h>
  18 #include <linux/mount.h>
  19 #include <linux/kthread.h>
  20 #include <linux/delay.h>
  21 #include <linux/gfs2_ondisk.h>
  22 #include <asm/semaphore.h>
  23
  24 #include "gfs2.h"
  25 #include "lm_interface.h"
  26 #include "incore.h"
  27 #include "glock.h"
  28 #include "inode.h"
  29 #include "lm.h"
  30 #include "log.h"
  31 #include "mount.h"
  32 #include "ops_super.h"
  33 #include "page.h"
  34 #include "quota.h"
  35 #include "recovery.h"
  36 #include "rgrp.h"
  37 #include "super.h"
  38 #include "sys.h"
  39 #include "util.h"
  40
  41 /**
  42  * gfs2_write_inode - Make sure the inode is stable on the disk
  43  * @inode: The inode
  44  * @sync: synchronous write flag
  45  *
  46  * Returns: errno
  47  */
  48
  49 static int gfs2_write_inode(struct inode *inode, int sync)
  50 {
  51         struct gfs2_inode *ip = inode->u.generic_ip;
  52
  53         if (current->flags & PF_MEMALLOC)
  54                 return 0;
  55         if (ip && sync)
  56                 gfs2_log_flush_glock(ip->i_gl);
  57
  58         return 0;
  59 }
  60
  61 /**
  62  * gfs2_put_super - Unmount the filesystem
  63  * @sb: The VFS superblock
  64  *
  65  */
  66
  67 static void gfs2_put_super(struct super_block *sb)
  68 {
  69         struct gfs2_sbd *sdp = sb->s_fs_info;
  70         int error;
  71
  72         if (!sdp)
  73                 return;
  74
  75         /*  Unfreeze the filesystem, if we need to  */
  76
  77         mutex_lock(&sdp->sd_freeze_lock);
  78         if (sdp->sd_freeze_count)
  79                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
  80         mutex_unlock(&sdp->sd_freeze_lock);
  81
  82         kthread_stop(sdp->sd_inoded_process);
  83         kthread_stop(sdp->sd_quotad_process);
  84         kthread_stop(sdp->sd_logd_process);
  85         kthread_stop(sdp->sd_recoverd_process);
  86         while (sdp->sd_glockd_num--)
  87                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
  88         kthread_stop(sdp->sd_scand_process);
  89
  90         if (!(sb->s_flags & MS_RDONLY)) {
  91                 error = gfs2_make_fs_ro(sdp);
  92                 if (error)
  93                         gfs2_io_error(sdp);
  94         }
  95
  96         /*  At this point, we're through modifying the disk  */
  97
  98         /*  Release stuff  */
  99
 100         iput(sdp->sd_master_dir);
 101         iput(sdp->sd_jindex);
 102         iput(sdp->sd_inum_inode);
 103         iput(sdp->sd_statfs_inode);
 104         iput(sdp->sd_rindex);
 105         iput(sdp->sd_quota_inode);
 106         iput(sdp->sd_root_dir);
 107
 108         gfs2_glock_put(sdp->sd_rename_gl);
 109         gfs2_glock_put(sdp->sd_trans_gl);
 110
 111         if (!sdp->sd_args.ar_spectator) {
 112                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 113                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 114                 gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 115                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 116                 gfs2_glock_dq_uninit(&sdp->sd_ut_gh);
 117                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 118                 iput(sdp->sd_ir_inode);
 119                 iput(sdp->sd_sc_inode);
 120                 iput(sdp->sd_ut_inode);
 121                 iput(sdp->sd_qc_inode);
 122         }
 123
 124         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 125
 126         gfs2_clear_rgrpd(sdp);
 127         gfs2_jindex_free(sdp);
 128
 129         /*  Take apart glock structures and buffer lists  */
 130         gfs2_gl_hash_clear(sdp, WAIT);
 131
 132         /*  Unmount the locking protocol  */
 133         gfs2_lm_unmount(sdp);
 134
 135         /*  At this point, we're through participating in the lockspace  */
 136
 137         gfs2_sys_fs_del(sdp);
 138
 139         /*  Get rid of any extra inodes  */
 140         while (invalidate_inodes(sb))
 141                 yield();
 142
 143         vfree(sdp);
 144
 145         sb->s_fs_info = NULL;
 146 }
 147
 148 /**
 149  * gfs2_write_super - disk commit all incore transactions
 150  * @sb: the filesystem
 151  *
 152  * This function is called every time sync(2) is called.
 153  * After this exits, all dirty buffers and synced.
 154  */
 155
 156 static void gfs2_write_super(struct super_block *sb)
 157 {
 158         struct gfs2_sbd *sdp = sb->s_fs_info;
 159         gfs2_log_flush(sdp);
 160 }
 161
 162 /**
 163  * gfs2_write_super_lockfs - prevent further writes to the filesystem
 164  * @sb: the VFS structure for the filesystem
 165  *
 166  */
 167
 168 static void gfs2_write_super_lockfs(struct super_block *sb)
 169 {
 170         struct gfs2_sbd *sdp = sb->s_fs_info;
 171         int error;
 172
 173         for (;;) {
 174                 error = gfs2_freeze_fs(sdp);
 175                 if (!error)
 176                         break;
 177
 178                 switch (error) {
 179                 case -EBUSY:
 180                         fs_err(sdp, "waiting for recovery before freeze\n");
 181                         break;
 182
 183                 default:
 184                         fs_err(sdp, "error freezing FS: %d\n", error);
 185                         break;
 186                 }
 187
 188                 fs_err(sdp, "retrying...\n");
 189                 msleep(1000);
 190         }
 191 }
 192
 193 /**
 194  * gfs2_unlockfs - reallow writes to the filesystem
 195  * @sb: the VFS structure for the filesystem
 196  *
 197  */
 198
 199 static void gfs2_unlockfs(struct super_block *sb)
 200 {
 201         struct gfs2_sbd *sdp = sb->s_fs_info;
 202         gfs2_unfreeze_fs(sdp);
 203 }
 204
 205 /**
 206  * gfs2_statfs - Gather and return stats about the filesystem
 207  * @sb: The superblock
 208  * @statfsbuf: The buffer
 209  *
 210  * Returns: 0 on success or error code
 211  */
 212
 213 static int gfs2_statfs(struct super_block *sb, struct kstatfs *buf)
 214 {
 215         struct gfs2_sbd *sdp = sb->s_fs_info;
 216         struct gfs2_statfs_change sc;
 217         int error;
 218
 219         if (gfs2_tune_get(sdp, gt_statfs_slow))
 220                 error = gfs2_statfs_slow(sdp, &sc);
 221         else
 222                 error = gfs2_statfs_i(sdp, &sc);
 223
 224         if (error)
 225                 return error;
 226
 227         memset(buf, 0, sizeof(struct kstatfs));
 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         struct gfs2_inode *ip = inode->u.generic_ip;
 291
 292         if (ip) {
 293                 spin_lock(&ip->i_spin);
 294                 ip->i_vnode = NULL;
 295                 inode->u.generic_ip = NULL;
 296                 spin_unlock(&ip->i_spin);
 297
 298                 gfs2_glock_schedule_for_reclaim(ip->i_gl);
 299                 gfs2_inode_put(ip);
 300         }
 301 }
 302
 303 /**
 304  * gfs2_show_options - Show mount options for /proc/mounts
 305  * @s: seq_file structure
 306  * @mnt: vfsmount
 307  *
 308  * Returns: 0 on success or error code
 309  */
 310
 311 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
 312 {
 313         struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
 314         struct gfs2_args *args = &sdp->sd_args;
 315
 316         if (args->ar_lockproto[0])
 317                 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
 318         if (args->ar_locktable[0])
 319                 seq_printf(s, ",locktable=%s", args->ar_locktable);
 320         if (args->ar_hostdata[0])
 321                 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
 322         if (args->ar_spectator)
 323                 seq_printf(s, ",spectator");
 324         if (args->ar_ignore_local_fs)
 325                 seq_printf(s, ",ignore_local_fs");
 326         if (args->ar_localflocks)
 327                 seq_printf(s, ",localflocks");
 328         if (args->ar_localcaching)
 329                 seq_printf(s, ",localcaching");
 330         if (args->ar_debug)
 331                 seq_printf(s, ",debug");
 332         if (args->ar_upgrade)
 333                 seq_printf(s, ",upgrade");
 334         if (args->ar_num_glockd != GFS2_GLOCKD_DEFAULT)
 335                 seq_printf(s, ",num_glockd=%u", args->ar_num_glockd);
 336         if (args->ar_posix_acl)
 337                 seq_printf(s, ",acl");
 338         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
 339                 char *state;
 340                 switch (args->ar_quota) {
 341                 case GFS2_QUOTA_OFF:
 342                         state = "off";
 343                         break;
 344                 case GFS2_QUOTA_ACCOUNT:
 345                         state = "account";
 346                         break;
 347                 case GFS2_QUOTA_ON:
 348                         state = "on";
 349                         break;
 350                 default:
 351                         state = "unknown";
 352                         break;
 353                 }
 354                 seq_printf(s, ",quota=%s", state);
 355         }
 356         if (args->ar_suiddir)
 357                 seq_printf(s, ",suiddir");
 358         if (args->ar_data != GFS2_DATA_DEFAULT) {
 359                 char *state;
 360                 switch (args->ar_data) {
 361                 case GFS2_DATA_WRITEBACK:
 362                         state = "writeback";
 363                         break;
 364                 case GFS2_DATA_ORDERED:
 365                         state = "ordered";
 366                         break;
 367                 default:
 368                         state = "unknown";
 369                         break;
 370                 }
 371                 seq_printf(s, ",data=%s", state);
 372         }
 373
 374         return 0;
 375 }
 376
 377 struct super_operations gfs2_super_ops = {
 378         .write_inode = gfs2_write_inode,
 379         .put_super = gfs2_put_super,
 380         .write_super = gfs2_write_super,
 381         .write_super_lockfs = gfs2_write_super_lockfs,
 382         .unlockfs = gfs2_unlockfs,
 383         .statfs = gfs2_statfs,
 384         .remount_fs = gfs2_remount_fs,
 385         .clear_inode = gfs2_clear_inode,
 386         .show_options = gfs2_show_options,
 387 };
 388