fs/gfs2/glops.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2008 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/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/gfs2_ondisk.h>
  15 #include <linux/bio.h>
  16
  17 #include "gfs2.h"
  18 #include "incore.h"
  19 #include "bmap.h"
  20 #include "glock.h"
  21 #include "glops.h"
  22 #include "inode.h"
  23 #include "log.h"
  24 #include "meta_io.h"
  25 #include "recovery.h"
  26 #include "rgrp.h"
  27 #include "util.h"
  28 #include "trans.h"
  29
  30 /**
  31  * ail_empty_gl - remove all buffers for a given lock from the AIL
  32  * @gl: the glock
  33  *
  34  * None of the buffers should be dirty, locked, or pinned.
  35  */
  36
  37 static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
  38 {
  39         struct gfs2_sbd *sdp = gl->gl_sbd;
  40         struct list_head *head = &gl->gl_ail_list;
  41         struct gfs2_bufdata *bd;
  42         struct buffer_head *bh;
  43         struct gfs2_trans tr;
  44
  45         memset(&tr, 0, sizeof(tr));
  46         tr.tr_revokes = atomic_read(&gl->gl_ail_count);
  47
  48         if (!tr.tr_revokes)
  49                 return;
  50
  51         /* A shortened, inline version of gfs2_trans_begin() */
  52         tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
  53         tr.tr_ip = (unsigned long)__builtin_return_address(0);
  54         INIT_LIST_HEAD(&tr.tr_list_buf);
  55         gfs2_log_reserve(sdp, tr.tr_reserved);
  56         BUG_ON(current->journal_info);
  57         current->journal_info = &tr;
  58
  59         gfs2_log_lock(sdp);
  60         while (!list_empty(head)) {
  61                 bd = list_entry(head->next, struct gfs2_bufdata,
  62                                 bd_ail_gl_list);
  63                 bh = bd->bd_bh;
  64                 gfs2_remove_from_ail(bd);
  65                 bd->bd_bh = NULL;
  66                 bh->b_private = NULL;
  67                 bd->bd_blkno = bh->b_blocknr;
  68                 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
  69                 gfs2_trans_add_revoke(sdp, bd);
  70         }
  71         gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
  72         gfs2_log_unlock(sdp);
  73
  74         gfs2_trans_end(sdp);
  75         gfs2_log_flush(sdp, NULL);
  76 }
  77
  78 /**
  79  * rgrp_go_sync - sync out the metadata for this glock
  80  * @gl: the glock
  81  *
  82  * Called when demoting or unlocking an EX glock.  We must flush
  83  * to disk all dirty buffers/pages relating to this glock, and must not
  84  * not return to caller to demote/unlock the glock until I/O is complete.
  85  */
  86
  87 static void rgrp_go_sync(struct gfs2_glock *gl)
  88 {
  89         struct address_space *metamapping = gl->gl_aspace->i_mapping;
  90         int error;
  91
  92         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
  93                 return;
  94         BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
  95
  96         gfs2_log_flush(gl->gl_sbd, gl);
  97         filemap_fdatawrite(metamapping);
  98         error = filemap_fdatawait(metamapping);
  99         mapping_set_error(metamapping, error);
 100         gfs2_ail_empty_gl(gl);
 101 }
 102
 103 /**
 104  * rgrp_go_inval - invalidate the metadata for this glock
 105  * @gl: the glock
 106  * @flags:
 107  *
 108  * We never used LM_ST_DEFERRED with resource groups, so that we
 109  * should always see the metadata flag set here.
 110  *
 111  */
 112
 113 static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
 114 {
 115         struct address_space *mapping = gl->gl_aspace->i_mapping;
 116
 117         BUG_ON(!(flags & DIO_METADATA));
 118         gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
 119         truncate_inode_pages(mapping, 0);
 120
 121         if (gl->gl_object) {
 122                 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
 123                 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
 124         }
 125 }
 126
 127 /**
 128  * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
 129  * @gl: the glock protecting the inode
 130  *
 131  */
 132
 133 static void inode_go_sync(struct gfs2_glock *gl)
 134 {
 135         struct gfs2_inode *ip = gl->gl_object;
 136         struct address_space *metamapping = gl->gl_aspace->i_mapping;
 137         int error;
 138
 139         if (ip && !S_ISREG(ip->i_inode.i_mode))
 140                 ip = NULL;
 141         if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
 142                 unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
 143         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
 144                 return;
 145
 146         BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
 147
 148         gfs2_log_flush(gl->gl_sbd, gl);
 149         filemap_fdatawrite(metamapping);
 150         if (ip) {
 151                 struct address_space *mapping = ip->i_inode.i_mapping;
 152                 filemap_fdatawrite(mapping);
 153                 error = filemap_fdatawait(mapping);
 154                 mapping_set_error(mapping, error);
 155         }
 156         error = filemap_fdatawait(metamapping);
 157         mapping_set_error(metamapping, error);
 158         gfs2_ail_empty_gl(gl);
 159         /*
 160          * Writeback of the data mapping may cause the dirty flag to be set
 161          * so we have to clear it again here.
 162          */
 163         smp_mb__before_clear_bit();
 164         clear_bit(GLF_DIRTY, &gl->gl_flags);
 165 }
 166
 167 /**
 168  * inode_go_inval - prepare a inode glock to be released
 169  * @gl: the glock
 170  * @flags:
 171  *
 172  * Normally we invlidate everything, but if we are moving into
 173  * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
 174  * can keep hold of the metadata, since it won't have changed.
 175  *
 176  */
 177
 178 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 179 {
 180         struct gfs2_inode *ip = gl->gl_object;
 181
 182         gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
 183
 184         if (flags & DIO_METADATA) {
 185                 struct address_space *mapping = gl->gl_aspace->i_mapping;
 186                 truncate_inode_pages(mapping, 0);
 187                 if (ip)
 188                         set_bit(GIF_INVALID, &ip->i_flags);
 189         }
 190
 191         if (ip == GFS2_I(gl->gl_sbd->sd_rindex))
 192                 gl->gl_sbd->sd_rindex_uptodate = 0;
 193         if (ip && S_ISREG(ip->i_inode.i_mode))
 194                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
 195 }
 196
 197 /**
 198  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 199  * @gl: the glock
 200  *
 201  * Returns: 1 if it's ok
 202  */
 203
 204 static int inode_go_demote_ok(const struct gfs2_glock *gl)
 205 {
 206         struct gfs2_sbd *sdp = gl->gl_sbd;
 207         if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
 208                 return 0;
 209         return 1;
 210 }
 211
 212 /**
 213  * inode_go_lock - operation done after an inode lock is locked by a process
 214  * @gl: the glock
 215  * @flags:
 216  *
 217  * Returns: errno
 218  */
 219
 220 static int inode_go_lock(struct gfs2_holder *gh)
 221 {
 222         struct gfs2_glock *gl = gh->gh_gl;
 223         struct gfs2_sbd *sdp = gl->gl_sbd;
 224         struct gfs2_inode *ip = gl->gl_object;
 225         int error = 0;
 226
 227         if (!ip || (gh->gh_flags & GL_SKIP))
 228                 return 0;
 229
 230         if (test_bit(GIF_INVALID, &ip->i_flags)) {
 231                 error = gfs2_inode_refresh(ip);
 232                 if (error)
 233                         return error;
 234         }
 235
 236         if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
 237             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 238             (gh->gh_state == LM_ST_EXCLUSIVE)) {
 239                 spin_lock(&sdp->sd_trunc_lock);
 240                 if (list_empty(&ip->i_trunc_list))
 241                         list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
 242                 spin_unlock(&sdp->sd_trunc_lock);
 243                 wake_up(&sdp->sd_quota_wait);
 244                 return 1;
 245         }
 246
 247         return error;
 248 }
 249
 250 /**
 251  * inode_go_dump - print information about an inode
 252  * @seq: The iterator
 253  * @ip: the inode
 254  *
 255  * Returns: 0 on success, -ENOBUFS when we run out of space
 256  */
 257
 258 static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
 259 {
 260         const struct gfs2_inode *ip = gl->gl_object;
 261         if (ip == NULL)
 262                 return 0;
 263         gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu/%llu\n",
 264                   (unsigned long long)ip->i_no_formal_ino,
 265                   (unsigned long long)ip->i_no_addr,
 266                   IF2DT(ip->i_inode.i_mode), ip->i_flags,
 267                   (unsigned int)ip->i_diskflags,
 268                   (unsigned long long)ip->i_inode.i_size,
 269                   (unsigned long long)ip->i_disksize);
 270         return 0;
 271 }
 272
 273 /**
 274  * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
 275  * @gl: the glock
 276  *
 277  * Returns: 1 if it's ok
 278  */
 279
 280 static int rgrp_go_demote_ok(const struct gfs2_glock *gl)
 281 {
 282         return !gl->gl_aspace->i_mapping->nrpages;
 283 }
 284
 285 /**
 286  * rgrp_go_lock - operation done after an rgrp lock is locked by
 287  *    a first holder on this node.
 288  * @gl: the glock
 289  * @flags:
 290  *
 291  * Returns: errno
 292  */
 293
 294 static int rgrp_go_lock(struct gfs2_holder *gh)
 295 {
 296         return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
 297 }
 298
 299 /**
 300  * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
 301  *    a last holder on this node.
 302  * @gl: the glock
 303  * @flags:
 304  *
 305  */
 306
 307 static void rgrp_go_unlock(struct gfs2_holder *gh)
 308 {
 309         gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
 310 }
 311
 312 /**
 313  * trans_go_sync - promote/demote the transaction glock
 314  * @gl: the glock
 315  * @state: the requested state
 316  * @flags:
 317  *
 318  */
 319
 320 static void trans_go_sync(struct gfs2_glock *gl)
 321 {
 322         struct gfs2_sbd *sdp = gl->gl_sbd;
 323
 324         if (gl->gl_state != LM_ST_UNLOCKED &&
 325             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 326                 flush_workqueue(gfs2_delete_workqueue);
 327                 gfs2_meta_syncfs(sdp);
 328                 gfs2_log_shutdown(sdp);
 329         }
 330 }
 331
 332 /**
 333  * trans_go_xmote_bh - After promoting/demoting the transaction glock
 334  * @gl: the glock
 335  *
 336  */
 337
 338 static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
 339 {
 340         struct gfs2_sbd *sdp = gl->gl_sbd;
 341         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 342         struct gfs2_glock *j_gl = ip->i_gl;
 343         struct gfs2_log_header_host head;
 344         int error;
 345
 346         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 347                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 348
 349                 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 350                 if (error)
 351                         gfs2_consist(sdp);
 352                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
 353                         gfs2_consist(sdp);
 354
 355                 /*  Initialize some head of the log stuff  */
 356                 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
 357                         sdp->sd_log_sequence = head.lh_sequence + 1;
 358                         gfs2_log_pointers_init(sdp, head.lh_blkno);
 359                 }
 360         }
 361         return 0;
 362 }
 363
 364 /**
 365  * trans_go_demote_ok
 366  * @gl: the glock
 367  *
 368  * Always returns 0
 369  */
 370
 371 static int trans_go_demote_ok(const struct gfs2_glock *gl)
 372 {
 373         return 0;
 374 }
 375
 376 /**
 377  * iopen_go_callback - schedule the dcache entry for the inode to be deleted
 378  * @gl: the glock
 379  *
 380  * gl_spin lock is held while calling this
 381  */
 382 static void iopen_go_callback(struct gfs2_glock *gl)
 383 {
 384         struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;
 385
 386         if (gl->gl_demote_state == LM_ST_UNLOCKED &&
 387             gl->gl_state == LM_ST_SHARED &&
 388             ip && test_bit(GIF_USER, &ip->i_flags)) {
 389                 gfs2_glock_hold(gl);
 390                 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
 391                         gfs2_glock_put_nolock(gl);
 392         }
 393 }
 394
 395 const struct gfs2_glock_operations gfs2_meta_glops = {
 396         .go_type = LM_TYPE_META,
 397 };
 398
 399 const struct gfs2_glock_operations gfs2_inode_glops = {
 400         .go_xmote_th = inode_go_sync,
 401         .go_inval = inode_go_inval,
 402         .go_demote_ok = inode_go_demote_ok,
 403         .go_lock = inode_go_lock,
 404         .go_dump = inode_go_dump,
 405         .go_type = LM_TYPE_INODE,
 406         .go_min_hold_time = HZ / 5,
 407 };
 408
 409 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 410         .go_xmote_th = rgrp_go_sync,
 411         .go_inval = rgrp_go_inval,
 412         .go_demote_ok = rgrp_go_demote_ok,
 413         .go_lock = rgrp_go_lock,
 414         .go_unlock = rgrp_go_unlock,
 415         .go_dump = gfs2_rgrp_dump,
 416         .go_type = LM_TYPE_RGRP,
 417         .go_min_hold_time = HZ / 5,
 418 };
 419
 420 const struct gfs2_glock_operations gfs2_trans_glops = {
 421         .go_xmote_th = trans_go_sync,
 422         .go_xmote_bh = trans_go_xmote_bh,
 423         .go_demote_ok = trans_go_demote_ok,
 424         .go_type = LM_TYPE_NONDISK,
 425 };
 426
 427 const struct gfs2_glock_operations gfs2_iopen_glops = {
 428         .go_type = LM_TYPE_IOPEN,
 429         .go_callback = iopen_go_callback,
 430 };
 431
 432 const struct gfs2_glock_operations gfs2_flock_glops = {
 433         .go_type = LM_TYPE_FLOCK,
 434 };
 435
 436 const struct gfs2_glock_operations gfs2_nondisk_glops = {
 437         .go_type = LM_TYPE_NONDISK,
 438 };
 439
 440 const struct gfs2_glock_operations gfs2_quota_glops = {
 441         .go_type = LM_TYPE_QUOTA,
 442 };
 443
 444 const struct gfs2_glock_operations gfs2_journal_glops = {
 445         .go_type = LM_TYPE_JOURNAL,
 446 };
 447
 448 const struct gfs2_glock_operations *gfs2_glops_list[] = {
 449         [LM_TYPE_META] = &gfs2_meta_glops,
 450         [LM_TYPE_INODE] = &gfs2_inode_glops,
 451         [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
 452         [LM_TYPE_NONDISK] = &gfs2_trans_glops,
 453         [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
 454         [LM_TYPE_FLOCK] = &gfs2_flock_glops,
 455         [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
 456         [LM_TYPE_QUOTA] = &gfs2_quota_glops,
 457         [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
 458 };
 459