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
 107         gfs2_glock_put(sdp->sd_rename_gl);
 108         gfs2_glock_put(sdp->sd_trans_gl);
 109
 110         if (!sdp->sd_args.ar_spectator) {
 111                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 112                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 113                 gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 114                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 115                 gfs2_glock_dq_uninit(&sdp->sd_ut_gh);
 116                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 117                 iput(sdp->sd_ir_inode);
 118                 iput(sdp->sd_sc_inode);
 119                 iput(sdp->sd_ut_inode);
 120                 iput(sdp->sd_qc_inode);
 121         }
 122
 123         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 124
 125         gfs2_clear_rgrpd(sdp);
 126         gfs2_jindex_free(sdp);
 127
 128         /*  Take apart glock structures and buffer lists  */
 129         gfs2_gl_hash_clear(sdp, WAIT);
 130
 131         /*  Unmount the locking protocol  */
 132         gfs2_lm_unmount(sdp);
 133
 134         /*  At this point, we're through participating in the lockspace  */
 135
 136         gfs2_sys_fs_del(sdp);
 137
 138         /*  Get rid of any extra inodes  */
 139         while (invalidate_inodes(sb))
 140                 yield();
 141
 142         vfree(sdp);
 143
 144         sb->s_fs_info = NULL;
 145 }
 146
 147 /**
 148  * gfs2_write_super - disk commit all incore transactions
 149  * @sb: the filesystem
 150  *
 151  * This function is called every time sync(2) is called.
 152  * After this exits, all dirty buffers and synced.
 153  */
 154
 155 static void gfs2_write_super(struct super_block *sb)
 156 {
 157         struct gfs2_sbd *sdp = sb->s_fs_info;
 158         gfs2_log_flush(sdp);
 159 }
 160
 161 /**
 162  * gfs2_write_super_lockfs - prevent further writes to the filesystem
 163  * @sb: the VFS structure for the filesystem
 164  *
 165  */
 166
 167 static void gfs2_write_super_lockfs(struct super_block *sb)
 168 {
 169         struct gfs2_sbd *sdp = sb->s_fs_info;
 170         int error;
 171
 172         for (;;) {
 173                 error = gfs2_freeze_fs(sdp);
 174                 if (!error)
 175                         break;
 176
 177                 switch (error) {
 178                 case -EBUSY:
 179                         fs_err(sdp, "waiting for recovery before freeze\n");
 180                         break;
 181
 182                 default:
 183                         fs_err(sdp, "error freezing FS: %d\n", error);
 184                         break;
 185                 }
 186
 187                 fs_err(sdp, "retrying...\n");
 188                 msleep(1000);
 189         }
 190 }
 191
 192 /**
 193  * gfs2_unlockfs - reallow writes to the filesystem
 194  * @sb: the VFS structure for the filesystem
 195  *
 196  */
 197
 198 static void gfs2_unlockfs(struct super_block *sb)
 199 {
 200         struct gfs2_sbd *sdp = sb->s_fs_info;
 201         gfs2_unfreeze_fs(sdp);
 202 }
 203
 204 /**
 205  * gfs2_statfs - Gather and return stats about the filesystem
 206  * @sb: The superblock
 207  * @statfsbuf: The buffer
 208  *
 209  * Returns: 0 on success or error code
 210  */
 211
 212 static int gfs2_statfs(struct super_block *sb, struct kstatfs *buf)
 213 {
 214         struct gfs2_sbd *sdp = sb->s_fs_info;
 215         struct gfs2_statfs_change sc;
 216         int error;
 217
 218         if (gfs2_tune_get(sdp, gt_statfs_slow))
 219                 error = gfs2_statfs_slow(sdp, &sc);
 220         else
 221                 error = gfs2_statfs_i(sdp, &sc);
 222
 223         if (error)
 224                 return error;
 225
 226         memset(buf, 0, sizeof(struct kstatfs));
 227
 228         buf->f_type = GFS2_MAGIC;
 229         buf->f_bsize = sdp->sd_sb.sb_bsize;
 230         buf->f_blocks = sc.sc_total;
 231         buf->f_bfree = sc.sc_free;
 232         buf->f_bavail = sc.sc_free;
 233         buf->f_files = sc.sc_dinodes + sc.sc_free;
 234         buf->f_ffree = sc.sc_free;
 235         buf->f_namelen = GFS2_FNAMESIZE;
 236
 237         return 0;
 238 }
 239
 240 /**
 241  * gfs2_remount_fs - called when the FS is remounted
 242  * @sb:  the filesystem
 243  * @flags:  the remount flags
 244  * @data:  extra data passed in (not used right now)
 245  *
 246  * Returns: errno
 247  */
 248
 249 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
 250 {
 251         struct gfs2_sbd *sdp = sb->s_fs_info;
 252         int error;
 253
 254         error = gfs2_mount_args(sdp, data, 1);
 255         if (error)
 256                 return error;
 257
 258         if (sdp->sd_args.ar_spectator)
 259                 *flags |= MS_RDONLY;
 260         else {
 261                 if (*flags & MS_RDONLY) {
 262                         if (!(sb->s_flags & MS_RDONLY))
 263                                 error = gfs2_make_fs_ro(sdp);
 264                 } else if (!(*flags & MS_RDONLY) &&
 265                            (sb->s_flags & MS_RDONLY)) {
 266                         error = gfs2_make_fs_rw(sdp);
 267                 }
 268         }
 269
 270         if (*flags & (MS_NOATIME | MS_NODIRATIME))
 271                 set_bit(SDF_NOATIME, &sdp->sd_flags);
 272         else
 273                 clear_bit(SDF_NOATIME, &sdp->sd_flags);
 274
 275         /* Don't let the VFS update atimes.  GFS2 handles this itself. */
 276         *flags |= MS_NOATIME | MS_NODIRATIME;
 277
 278         return error;
 279 }
 280
 281 /**
 282  * gfs2_clear_inode - Deallocate an inode when VFS is done with it
 283  * @inode: The VFS inode
 284  *
 285  */
 286
 287 static void gfs2_clear_inode(struct inode *inode)
 288 {
 289         struct gfs2_inode *ip = inode->u.generic_ip;
 290
 291         if (ip) {
 292                 spin_lock(&ip->i_spin);
 293                 ip->i_vnode = NULL;
 294                 inode->u.generic_ip = NULL;
 295                 spin_unlock(&ip->i_spin);
 296
 297                 gfs2_glock_schedule_for_reclaim(ip->i_gl);
 298                 gfs2_inode_put(ip);
 299         }
 300 }
 301
 302 /**
 303  * gfs2_show_options - Show mount options for /proc/mounts
 304  * @s: seq_file structure
 305  * @mnt: vfsmount
 306  *
 307  * Returns: 0 on success or error code
 308  */
 309
 310 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
 311 {
 312         struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
 313         struct gfs2_args *args = &sdp->sd_args;
 314
 315         if (args->ar_lockproto[0])
 316                 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
 317         if (args->ar_locktable[0])
 318                 seq_printf(s, ",locktable=%s", args->ar_locktable);
 319         if (args->ar_hostdata[0])
 320                 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
 321         if (args->ar_spectator)
 322                 seq_printf(s, ",spectator");
 323         if (args->ar_ignore_local_fs)
 324                 seq_printf(s, ",ignore_local_fs");
 325         if (args->ar_localflocks)
 326                 seq_printf(s, ",localflocks");
 327         if (args->ar_localcaching)
 328                 seq_printf(s, ",localcaching");
 329         if (args->ar_debug)
 330                 seq_printf(s, ",debug");
 331         if (args->ar_upgrade)
 332                 seq_printf(s, ",upgrade");
 333         if (args->ar_num_glockd != GFS2_GLOCKD_DEFAULT)
 334                 seq_printf(s, ",num_glockd=%u", args->ar_num_glockd);
 335         if (args->ar_posix_acl)
 336                 seq_printf(s, ",acl");
 337         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
 338                 char *state;
 339                 switch (args->ar_quota) {
 340                 case GFS2_QUOTA_OFF:
 341                         state = "off";
 342                         break;
 343                 case GFS2_QUOTA_ACCOUNT:
 344                         state = "account";
 345                         break;
 346                 case GFS2_QUOTA_ON:
 347                         state = "on";
 348                         break;
 349                 default:
 350                         state = "unknown";
 351                         break;
 352                 }
 353                 seq_printf(s, ",quota=%s", state);
 354         }
 355         if (args->ar_suiddir)
 356                 seq_printf(s, ",suiddir");
 357         if (args->ar_data != GFS2_DATA_DEFAULT) {
 358                 char *state;
 359                 switch (args->ar_data) {
 360                 case GFS2_DATA_WRITEBACK:
 361                         state = "writeback";
 362                         break;
 363                 case GFS2_DATA_ORDERED:
 364                         state = "ordered";
 365                         break;
 366                 default:
 367                         state = "unknown";
 368                         break;
 369                 }
 370                 seq_printf(s, ",data=%s", state);
 371         }
 372
 373         return 0;
 374 }
 375
 376 struct super_operations gfs2_super_ops = {
 377         .write_inode = gfs2_write_inode,
 378         .put_super = gfs2_put_super,
 379         .write_super = gfs2_write_super,
 380         .write_super_lockfs = gfs2_write_super_lockfs,
 381         .unlockfs = gfs2_unlockfs,
 382         .statfs = gfs2_statfs,
 383         .remount_fs = gfs2_remount_fs,
 384         .clear_inode = gfs2_clear_inode,
 385         .show_options = gfs2_show_options,
 386 };
 387