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->u.generic_ip) {
  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 - disk commit all incore transactions
 142  * @sb: the filesystem
 143  *
 144  * This function is called every time sync(2) is called.
 145  * After this exits, all dirty buffers are synced.
 146  */
 147
 148 static void gfs2_write_super(struct super_block *sb)
 149 {
 150         gfs2_log_flush(sb->s_fs_info, NULL);
 151 }
 152
 153 /**
 154  * gfs2_write_super_lockfs - prevent further writes to the filesystem
 155  * @sb: the VFS structure for the filesystem
 156  *
 157  */
 158
 159 static void gfs2_write_super_lockfs(struct super_block *sb)
 160 {
 161         struct gfs2_sbd *sdp = sb->s_fs_info;
 162         int error;
 163
 164         for (;;) {
 165                 error = gfs2_freeze_fs(sdp);
 166                 if (!error)
 167                         break;
 168
 169                 switch (error) {
 170                 case -EBUSY:
 171                         fs_err(sdp, "waiting for recovery before freeze\n");
 172                         break;
 173
 174                 default:
 175                         fs_err(sdp, "error freezing FS: %d\n", error);
 176                         break;
 177                 }
 178
 179                 fs_err(sdp, "retrying...\n");
 180                 msleep(1000);
 181         }
 182 }
 183
 184 /**
 185  * gfs2_unlockfs - reallow writes to the filesystem
 186  * @sb: the VFS structure for the filesystem
 187  *
 188  */
 189
 190 static void gfs2_unlockfs(struct super_block *sb)
 191 {
 192         gfs2_unfreeze_fs(sb->s_fs_info);
 193 }
 194
 195 /**
 196  * gfs2_statfs - Gather and return stats about the filesystem
 197  * @sb: The superblock
 198  * @statfsbuf: The buffer
 199  *
 200  * Returns: 0 on success or error code
 201  */
 202
 203 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
 204 {
 205         struct super_block *sb = dentry->d_inode->i_sb;
 206         struct gfs2_sbd *sdp = sb->s_fs_info;
 207         struct gfs2_statfs_change sc;
 208         int error;
 209
 210         if (gfs2_tune_get(sdp, gt_statfs_slow))
 211                 error = gfs2_statfs_slow(sdp, &sc);
 212         else
 213                 error = gfs2_statfs_i(sdp, &sc);
 214
 215         if (error)
 216                 return error;
 217
 218         buf->f_type = GFS2_MAGIC;
 219         buf->f_bsize = sdp->sd_sb.sb_bsize;
 220         buf->f_blocks = sc.sc_total;
 221         buf->f_bfree = sc.sc_free;
 222         buf->f_bavail = sc.sc_free;
 223         buf->f_files = sc.sc_dinodes + sc.sc_free;
 224         buf->f_ffree = sc.sc_free;
 225         buf->f_namelen = GFS2_FNAMESIZE;
 226
 227         return 0;
 228 }
 229
 230 /**
 231  * gfs2_remount_fs - called when the FS is remounted
 232  * @sb:  the filesystem
 233  * @flags:  the remount flags
 234  * @data:  extra data passed in (not used right now)
 235  *
 236  * Returns: errno
 237  */
 238
 239 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
 240 {
 241         struct gfs2_sbd *sdp = sb->s_fs_info;
 242         int error;
 243
 244         error = gfs2_mount_args(sdp, data, 1);
 245         if (error)
 246                 return error;
 247
 248         if (sdp->sd_args.ar_spectator)
 249                 *flags |= MS_RDONLY;
 250         else {
 251                 if (*flags & MS_RDONLY) {
 252                         if (!(sb->s_flags & MS_RDONLY))
 253                                 error = gfs2_make_fs_ro(sdp);
 254                 } else if (!(*flags & MS_RDONLY) &&
 255                            (sb->s_flags & MS_RDONLY)) {
 256                         error = gfs2_make_fs_rw(sdp);
 257                 }
 258         }
 259
 260         if (*flags & (MS_NOATIME | MS_NODIRATIME))
 261                 set_bit(SDF_NOATIME, &sdp->sd_flags);
 262         else
 263                 clear_bit(SDF_NOATIME, &sdp->sd_flags);
 264
 265         /* Don't let the VFS update atimes.  GFS2 handles this itself. */
 266         *flags |= MS_NOATIME | MS_NODIRATIME;
 267
 268         return error;
 269 }
 270
 271 /**
 272  * gfs2_clear_inode - Deallocate an inode when VFS is done with it
 273  * @inode: The VFS inode
 274  *
 275  */
 276
 277 static void gfs2_clear_inode(struct inode *inode)
 278 {
 279         /* This tells us its a "real" inode and not one which only
 280          * serves to contain an address space (see rgrp.c, meta_io.c)
 281          * which therefore doesn't have its own glocks.
 282          */
 283         if (inode->u.generic_ip) {
 284                 struct gfs2_inode *ip = GFS2_I(inode);
 285                 gfs2_glock_inode_squish(inode);
 286                 gfs2_assert(inode->i_sb->s_fs_info, ip->i_gl->gl_state == LM_ST_UNLOCKED);
 287                 ip->i_gl->gl_object = NULL;
 288                 gfs2_glock_schedule_for_reclaim(ip->i_gl);
 289                 gfs2_glock_put(ip->i_gl);
 290                 ip->i_gl = NULL;
 291                 if (ip->i_iopen_gh.gh_gl)
 292                         gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 293         }
 294 }
 295
 296 /**
 297  * gfs2_show_options - Show mount options for /proc/mounts
 298  * @s: seq_file structure
 299  * @mnt: vfsmount
 300  *
 301  * Returns: 0 on success or error code
 302  */
 303
 304 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
 305 {
 306         struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
 307         struct gfs2_args *args = &sdp->sd_args;
 308
 309         if (args->ar_lockproto[0])
 310                 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
 311         if (args->ar_locktable[0])
 312                 seq_printf(s, ",locktable=%s", args->ar_locktable);
 313         if (args->ar_hostdata[0])
 314                 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
 315         if (args->ar_spectator)
 316                 seq_printf(s, ",spectator");
 317         if (args->ar_ignore_local_fs)
 318                 seq_printf(s, ",ignore_local_fs");
 319         if (args->ar_localflocks)
 320                 seq_printf(s, ",localflocks");
 321         if (args->ar_localcaching)
 322                 seq_printf(s, ",localcaching");
 323         if (args->ar_debug)
 324                 seq_printf(s, ",debug");
 325         if (args->ar_upgrade)
 326                 seq_printf(s, ",upgrade");
 327         if (args->ar_num_glockd != GFS2_GLOCKD_DEFAULT)
 328                 seq_printf(s, ",num_glockd=%u", args->ar_num_glockd);
 329         if (args->ar_posix_acl)
 330                 seq_printf(s, ",acl");
 331         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
 332                 char *state;
 333                 switch (args->ar_quota) {
 334                 case GFS2_QUOTA_OFF:
 335                         state = "off";
 336                         break;
 337                 case GFS2_QUOTA_ACCOUNT:
 338                         state = "account";
 339                         break;
 340                 case GFS2_QUOTA_ON:
 341                         state = "on";
 342                         break;
 343                 default:
 344                         state = "unknown";
 345                         break;
 346                 }
 347                 seq_printf(s, ",quota=%s", state);
 348         }
 349         if (args->ar_suiddir)
 350                 seq_printf(s, ",suiddir");
 351         if (args->ar_data != GFS2_DATA_DEFAULT) {
 352                 char *state;
 353                 switch (args->ar_data) {
 354                 case GFS2_DATA_WRITEBACK:
 355                         state = "writeback";
 356                         break;
 357                 case GFS2_DATA_ORDERED:
 358                         state = "ordered";
 359                         break;
 360                 default:
 361                         state = "unknown";
 362                         break;
 363                 }
 364                 seq_printf(s, ",data=%s", state);
 365         }
 366
 367         return 0;
 368 }
 369
 370 /*
 371  * We have to (at the moment) hold the inodes main lock to cover
 372  * the gap between unlocking the shared lock on the iopen lock and
 373  * taking the exclusive lock. I'd rather do a shared -> exclusive
 374  * conversion on the iopen lock, but we can change that later. This
 375  * is safe, just less efficient.
 376  */
 377 static void gfs2_delete_inode(struct inode *inode)
 378 {
 379         struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
 380         struct gfs2_inode *ip = GFS2_I(inode);
 381         struct gfs2_holder gh;
 382         int error;
 383
 384         if (!inode->u.generic_ip)
 385                 goto out;
 386
 387         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &gh);
 388         if (unlikely(error)) {
 389                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 390                 goto out;
 391         }
 392
 393         gfs2_glock_dq(&ip->i_iopen_gh);
 394         gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
 395         error = gfs2_glock_nq(&ip->i_iopen_gh);
 396         if (error)
 397                 goto out_uninit;
 398
 399         if (S_ISDIR(ip->i_di.di_mode) &&
 400             (ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
 401                 error = gfs2_dir_exhash_dealloc(ip);
 402                 if (error)
 403                         goto out_unlock;
 404         }
 405
 406         if (ip->i_di.di_eattr) {
 407                 error = gfs2_ea_dealloc(ip);
 408                 if (error)
 409                         goto out_unlock;
 410         }
 411
 412         if (!gfs2_is_stuffed(ip)) {
 413                 error = gfs2_file_dealloc(ip);
 414                 if (error)
 415                         goto out_unlock;
 416         }
 417
 418         error = gfs2_dinode_dealloc(ip);
 419
 420 out_unlock:
 421         gfs2_glock_dq(&ip->i_iopen_gh);
 422 out_uninit:
 423         gfs2_holder_uninit(&ip->i_iopen_gh);
 424         gfs2_glock_dq_uninit(&gh);
 425         if (error)
 426                 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
 427 out:
 428         truncate_inode_pages(&inode->i_data, 0);
 429         clear_inode(inode);
 430 }
 431
 432
 433
 434 static struct inode *gfs2_alloc_inode(struct super_block *sb)
 435 {
 436         struct gfs2_sbd *sdp = sb->s_fs_info;
 437         struct gfs2_inode *ip;
 438
 439         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
 440         if (ip) {
 441                 ip->i_flags = 0;
 442                 ip->i_gl = NULL;
 443                 ip->i_greedy = gfs2_tune_get(sdp, gt_greedy_default);
 444                 ip->i_last_pfault = jiffies;
 445         }
 446         return &ip->i_inode;
 447 }
 448
 449 static void gfs2_destroy_inode(struct inode *inode)
 450 {
 451         kmem_cache_free(gfs2_inode_cachep, inode);
 452 }
 453
 454 struct super_operations gfs2_super_ops = {
 455         .alloc_inode = gfs2_alloc_inode,
 456         .destroy_inode = gfs2_destroy_inode,
 457         .write_inode = gfs2_write_inode,
 458         .delete_inode = gfs2_delete_inode,
 459         .put_super = gfs2_put_super,
 460         .write_super = gfs2_write_super,
 461         .write_super_lockfs = gfs2_write_super_lockfs,
 462         .unlockfs = gfs2_unlockfs,
 463         .statfs = gfs2_statfs,
 464         .remount_fs = gfs2_remount_fs,
 465         .clear_inode = gfs2_clear_inode,
 466         .show_options = gfs2_show_options,
 467 };
 468