fs/gfs2/glops.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/gfs2_ondisk.h>
  16 #include <linux/lm_interface.h>
  17
  18 #include "gfs2.h"
  19 #include "incore.h"
  20 #include "bmap.h"
  21 #include "glock.h"
  22 #include "glops.h"
  23 #include "inode.h"
  24 #include "log.h"
  25 #include "meta_io.h"
  26 #include "recovery.h"
  27 #include "rgrp.h"
  28 #include "util.h"
  29 #include "trans.h"
  30
  31 /**
  32  * ail_empty_gl - remove all buffers for a given lock from the AIL
  33  * @gl: the glock
  34  *
  35  * None of the buffers should be dirty, locked, or pinned.
  36  */
  37
  38 static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
  39 {
  40         struct gfs2_sbd *sdp = gl->gl_sbd;
  41         unsigned int blocks;
  42         struct list_head *head = &gl->gl_ail_list;
  43         struct gfs2_bufdata *bd;
  44         struct buffer_head *bh;
  45         u64 blkno;
  46         int error;
  47
  48         blocks = atomic_read(&gl->gl_ail_count);
  49         if (!blocks)
  50                 return;
  51
  52         error = gfs2_trans_begin(sdp, 0, blocks);
  53         if (gfs2_assert_withdraw(sdp, !error))
  54                 return;
  55
  56         gfs2_log_lock(sdp);
  57         while (!list_empty(head)) {
  58                 bd = list_entry(head->next, struct gfs2_bufdata,
  59                                 bd_ail_gl_list);
  60                 bh = bd->bd_bh;
  61                 blkno = bh->b_blocknr;
  62                 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
  63
  64                 bd->bd_ail = NULL;
  65                 list_del(&bd->bd_ail_st_list);
  66                 list_del(&bd->bd_ail_gl_list);
  67                 atomic_dec(&gl->gl_ail_count);
  68                 brelse(bh);
  69                 gfs2_log_unlock(sdp);
  70
  71                 gfs2_trans_add_revoke(sdp, blkno);
  72
  73                 gfs2_log_lock(sdp);
  74         }
  75         gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
  76         gfs2_log_unlock(sdp);
  77
  78         gfs2_trans_end(sdp);
  79         gfs2_log_flush(sdp, NULL);
  80 }
  81
  82 /**
  83  * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
  84  * @gl: the glock
  85  *
  86  */
  87
  88 static void gfs2_pte_inval(struct gfs2_glock *gl)
  89 {
  90         struct gfs2_inode *ip;
  91         struct inode *inode;
  92
  93         ip = gl->gl_object;
  94         inode = &ip->i_inode;
  95         if (!ip || !S_ISREG(inode->i_mode))
  96                 return;
  97
  98         if (!test_bit(GIF_PAGED, &ip->i_flags))
  99                 return;
 100
 101         unmap_shared_mapping_range(inode->i_mapping, 0, 0);
 102
 103         if (test_bit(GIF_SW_PAGED, &ip->i_flags))
 104                 set_bit(GLF_DIRTY, &gl->gl_flags);
 105
 106         clear_bit(GIF_SW_PAGED, &ip->i_flags);
 107 }
 108
 109 /**
 110  * meta_go_sync - sync out the metadata for this glock
 111  * @gl: the glock
 112  *
 113  * Called when demoting or unlocking an EX glock.  We must flush
 114  * to disk all dirty buffers/pages relating to this glock, and must not
 115  * not return to caller to demote/unlock the glock until I/O is complete.
 116  */
 117
 118 static void meta_go_sync(struct gfs2_glock *gl)
 119 {
 120         if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
 121                 gfs2_log_flush(gl->gl_sbd, gl);
 122                 gfs2_meta_sync(gl);
 123                 gfs2_ail_empty_gl(gl);
 124         }
 125
 126 }
 127
 128 /**
 129  * meta_go_inval - invalidate the metadata for this glock
 130  * @gl: the glock
 131  * @flags:
 132  *
 133  */
 134
 135 static void meta_go_inval(struct gfs2_glock *gl, int flags)
 136 {
 137         if (!(flags & DIO_METADATA))
 138                 return;
 139
 140         gfs2_meta_inval(gl);
 141         gl->gl_vn++;
 142 }
 143
 144 /**
 145  * inode_go_xmote_th - promote/demote a glock
 146  * @gl: the glock
 147  * @state: the requested state
 148  * @flags:
 149  *
 150  */
 151
 152 static void inode_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
 153                               int flags)
 154 {
 155         if (gl->gl_state != LM_ST_UNLOCKED)
 156                 gfs2_pte_inval(gl);
 157         gfs2_glock_xmote_th(gl, state, flags);
 158 }
 159
 160 /**
 161  * inode_go_xmote_bh - After promoting/demoting a glock
 162  * @gl: the glock
 163  *
 164  */
 165
 166 static void inode_go_xmote_bh(struct gfs2_glock *gl)
 167 {
 168         struct gfs2_holder *gh = gl->gl_req_gh;
 169         struct buffer_head *bh;
 170         int error;
 171
 172         if (gl->gl_state != LM_ST_UNLOCKED &&
 173             (!gh || !(gh->gh_flags & GL_SKIP))) {
 174                 error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);
 175                 if (!error)
 176                         brelse(bh);
 177         }
 178 }
 179
 180 /**
 181  * inode_go_drop_th - unlock a glock
 182  * @gl: the glock
 183  *
 184  * Invoked from rq_demote().
 185  * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
 186  * is being purged from our node's glock cache; we're dropping lock.
 187  */
 188
 189 static void inode_go_drop_th(struct gfs2_glock *gl)
 190 {
 191         gfs2_pte_inval(gl);
 192         gfs2_glock_drop_th(gl);
 193 }
 194
 195 /**
 196  * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
 197  * @gl: the glock protecting the inode
 198  *
 199  */
 200
 201 static void inode_go_sync(struct gfs2_glock *gl)
 202 {
 203         struct gfs2_inode *ip = gl->gl_object;
 204
 205         if (ip && !S_ISREG(ip->i_inode.i_mode))
 206                 ip = NULL;
 207
 208         if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
 209                 gfs2_log_flush(gl->gl_sbd, gl);
 210                 if (ip)
 211                         filemap_fdatawrite(ip->i_inode.i_mapping);
 212                 gfs2_meta_sync(gl);
 213                 if (ip) {
 214                         struct address_space *mapping = ip->i_inode.i_mapping;
 215                         int error = filemap_fdatawait(mapping);
 216                         if (error == -ENOSPC)
 217                                 set_bit(AS_ENOSPC, &mapping->flags);
 218                         else if (error)
 219                                 set_bit(AS_EIO, &mapping->flags);
 220                 }
 221                 clear_bit(GLF_DIRTY, &gl->gl_flags);
 222                 gfs2_ail_empty_gl(gl);
 223         }
 224 }
 225
 226 /**
 227  * inode_go_inval - prepare a inode glock to be released
 228  * @gl: the glock
 229  * @flags:
 230  *
 231  */
 232
 233 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 234 {
 235         struct gfs2_inode *ip = gl->gl_object;
 236         int meta = (flags & DIO_METADATA);
 237
 238         if (meta) {
 239                 gfs2_meta_inval(gl);
 240                 if (ip)
 241                         set_bit(GIF_INVALID, &ip->i_flags);
 242         }
 243
 244         if (ip && S_ISREG(ip->i_inode.i_mode)) {
 245                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
 246                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), !ip->i_inode.i_mapping->nrpages);
 247                 clear_bit(GIF_PAGED, &ip->i_flags);
 248         }
 249 }
 250
 251 /**
 252  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 253  * @gl: the glock
 254  *
 255  * Returns: 1 if it's ok
 256  */
 257
 258 static int inode_go_demote_ok(struct gfs2_glock *gl)
 259 {
 260         struct gfs2_sbd *sdp = gl->gl_sbd;
 261         int demote = 0;
 262
 263         if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
 264                 demote = 1;
 265         else if (!sdp->sd_args.ar_localcaching &&
 266                  time_after_eq(jiffies, gl->gl_stamp +
 267                                gfs2_tune_get(sdp, gt_demote_secs) * HZ))
 268                 demote = 1;
 269
 270         return demote;
 271 }
 272
 273 /**
 274  * inode_go_lock - operation done after an inode lock is locked by a process
 275  * @gl: the glock
 276  * @flags:
 277  *
 278  * Returns: errno
 279  */
 280
 281 static int inode_go_lock(struct gfs2_holder *gh)
 282 {
 283         struct gfs2_glock *gl = gh->gh_gl;
 284         struct gfs2_inode *ip = gl->gl_object;
 285         int error = 0;
 286
 287         if (!ip)
 288                 return 0;
 289
 290         if (test_bit(GIF_INVALID, &ip->i_flags)) {
 291                 error = gfs2_inode_refresh(ip);
 292                 if (error)
 293                         return error;
 294         }
 295
 296         if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
 297             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 298             (gh->gh_flags & GL_LOCAL_EXCL))
 299                 error = gfs2_truncatei_resume(ip);
 300
 301         return error;
 302 }
 303
 304 /**
 305  * inode_go_unlock - operation done before an inode lock is unlocked by a
 306  *                   process
 307  * @gl: the glock
 308  * @flags:
 309  *
 310  */
 311
 312 static void inode_go_unlock(struct gfs2_holder *gh)
 313 {
 314         struct gfs2_glock *gl = gh->gh_gl;
 315         struct gfs2_inode *ip = gl->gl_object;
 316
 317         if (ip)
 318                 gfs2_meta_cache_flush(ip);
 319 }
 320
 321 /**
 322  * inode_greedy -
 323  * @gl: the glock
 324  *
 325  */
 326
 327 static void inode_greedy(struct gfs2_glock *gl)
 328 {
 329         struct gfs2_sbd *sdp = gl->gl_sbd;
 330         struct gfs2_inode *ip = gl->gl_object;
 331         unsigned int quantum = gfs2_tune_get(sdp, gt_greedy_quantum);
 332         unsigned int max = gfs2_tune_get(sdp, gt_greedy_max);
 333         unsigned int new_time;
 334
 335         spin_lock(&ip->i_spin);
 336
 337         if (time_after(ip->i_last_pfault + quantum, jiffies)) {
 338                 new_time = ip->i_greedy + quantum;
 339                 if (new_time > max)
 340                         new_time = max;
 341         } else {
 342                 new_time = ip->i_greedy - quantum;
 343                 if (!new_time || new_time > max)
 344                         new_time = 1;
 345         }
 346
 347         ip->i_greedy = new_time;
 348
 349         spin_unlock(&ip->i_spin);
 350
 351         iput(&ip->i_inode);
 352 }
 353
 354 /**
 355  * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
 356  * @gl: the glock
 357  *
 358  * Returns: 1 if it's ok
 359  */
 360
 361 static int rgrp_go_demote_ok(struct gfs2_glock *gl)
 362 {
 363         return !gl->gl_aspace->i_mapping->nrpages;
 364 }
 365
 366 /**
 367  * rgrp_go_lock - operation done after an rgrp lock is locked by
 368  *    a first holder on this node.
 369  * @gl: the glock
 370  * @flags:
 371  *
 372  * Returns: errno
 373  */
 374
 375 static int rgrp_go_lock(struct gfs2_holder *gh)
 376 {
 377         return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
 378 }
 379
 380 /**
 381  * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
 382  *    a last holder on this node.
 383  * @gl: the glock
 384  * @flags:
 385  *
 386  */
 387
 388 static void rgrp_go_unlock(struct gfs2_holder *gh)
 389 {
 390         gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
 391 }
 392
 393 /**
 394  * trans_go_xmote_th - promote/demote the transaction glock
 395  * @gl: the glock
 396  * @state: the requested state
 397  * @flags:
 398  *
 399  */
 400
 401 static void trans_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
 402                               int flags)
 403 {
 404         struct gfs2_sbd *sdp = gl->gl_sbd;
 405
 406         if (gl->gl_state != LM_ST_UNLOCKED &&
 407             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 408                 gfs2_meta_syncfs(sdp);
 409                 gfs2_log_shutdown(sdp);
 410         }
 411
 412         gfs2_glock_xmote_th(gl, state, flags);
 413 }
 414
 415 /**
 416  * trans_go_xmote_bh - After promoting/demoting the transaction glock
 417  * @gl: the glock
 418  *
 419  */
 420
 421 static void trans_go_xmote_bh(struct gfs2_glock *gl)
 422 {
 423         struct gfs2_sbd *sdp = gl->gl_sbd;
 424         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 425         struct gfs2_glock *j_gl = ip->i_gl;
 426         struct gfs2_log_header_host head;
 427         int error;
 428
 429         if (gl->gl_state != LM_ST_UNLOCKED &&
 430             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 431                 gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));
 432                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 433
 434                 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 435                 if (error)
 436                         gfs2_consist(sdp);
 437                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
 438                         gfs2_consist(sdp);
 439
 440                 /*  Initialize some head of the log stuff  */
 441                 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
 442                         sdp->sd_log_sequence = head.lh_sequence + 1;
 443                         gfs2_log_pointers_init(sdp, head.lh_blkno);
 444                 }
 445         }
 446 }
 447
 448 /**
 449  * trans_go_drop_th - unlock the transaction glock
 450  * @gl: the glock
 451  *
 452  * We want to sync the device even with localcaching.  Remember
 453  * that localcaching journal replay only marks buffers dirty.
 454  */
 455
 456 static void trans_go_drop_th(struct gfs2_glock *gl)
 457 {
 458         struct gfs2_sbd *sdp = gl->gl_sbd;
 459
 460         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 461                 gfs2_meta_syncfs(sdp);
 462                 gfs2_log_shutdown(sdp);
 463         }
 464
 465         gfs2_glock_drop_th(gl);
 466 }
 467
 468 /**
 469  * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
 470  * @gl: the glock
 471  *
 472  * Returns: 1 if it's ok
 473  */
 474
 475 static int quota_go_demote_ok(struct gfs2_glock *gl)
 476 {
 477         return !atomic_read(&gl->gl_lvb_count);
 478 }
 479
 480 const struct gfs2_glock_operations gfs2_meta_glops = {
 481         .go_xmote_th = gfs2_glock_xmote_th,
 482         .go_drop_th = gfs2_glock_drop_th,
 483         .go_type = LM_TYPE_META,
 484 };
 485
 486 const struct gfs2_glock_operations gfs2_inode_glops = {
 487         .go_xmote_th = inode_go_xmote_th,
 488         .go_xmote_bh = inode_go_xmote_bh,
 489         .go_drop_th = inode_go_drop_th,
 490         .go_sync = inode_go_sync,
 491         .go_inval = inode_go_inval,
 492         .go_demote_ok = inode_go_demote_ok,
 493         .go_lock = inode_go_lock,
 494         .go_unlock = inode_go_unlock,
 495         .go_greedy = inode_greedy,
 496         .go_type = LM_TYPE_INODE,
 497 };
 498
 499 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 500         .go_xmote_th = gfs2_glock_xmote_th,
 501         .go_drop_th = gfs2_glock_drop_th,
 502         .go_sync = meta_go_sync,
 503         .go_inval = meta_go_inval,
 504         .go_demote_ok = rgrp_go_demote_ok,
 505         .go_lock = rgrp_go_lock,
 506         .go_unlock = rgrp_go_unlock,
 507         .go_type = LM_TYPE_RGRP,
 508 };
 509
 510 const struct gfs2_glock_operations gfs2_trans_glops = {
 511         .go_xmote_th = trans_go_xmote_th,
 512         .go_xmote_bh = trans_go_xmote_bh,
 513         .go_drop_th = trans_go_drop_th,
 514         .go_type = LM_TYPE_NONDISK,
 515 };
 516
 517 const struct gfs2_glock_operations gfs2_iopen_glops = {
 518         .go_xmote_th = gfs2_glock_xmote_th,
 519         .go_drop_th = gfs2_glock_drop_th,
 520         .go_type = LM_TYPE_IOPEN,
 521 };
 522
 523 const struct gfs2_glock_operations gfs2_flock_glops = {
 524         .go_xmote_th = gfs2_glock_xmote_th,
 525         .go_drop_th = gfs2_glock_drop_th,
 526         .go_type = LM_TYPE_FLOCK,
 527 };
 528
 529 const struct gfs2_glock_operations gfs2_nondisk_glops = {
 530         .go_xmote_th = gfs2_glock_xmote_th,
 531         .go_drop_th = gfs2_glock_drop_th,
 532         .go_type = LM_TYPE_NONDISK,
 533 };
 534
 535 const struct gfs2_glock_operations gfs2_quota_glops = {
 536         .go_xmote_th = gfs2_glock_xmote_th,
 537         .go_drop_th = gfs2_glock_drop_th,
 538         .go_demote_ok = quota_go_demote_ok,
 539         .go_type = LM_TYPE_QUOTA,
 540 };
 541
 542 const struct gfs2_glock_operations gfs2_journal_glops = {
 543         .go_xmote_th = gfs2_glock_xmote_th,
 544         .go_drop_th = gfs2_glock_drop_th,
 545         .go_type = LM_TYPE_JOURNAL,
 546 };
 547