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 (gl->gl_state != LM_ST_EXCLUSIVE)
 121                 return;
 122
 123         if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
 124                 gfs2_log_flush(gl->gl_sbd, gl);
 125                 gfs2_meta_sync(gl);
 126                 gfs2_ail_empty_gl(gl);
 127         }
 128 }
 129
 130 /**
 131  * meta_go_inval - invalidate the metadata for this glock
 132  * @gl: the glock
 133  * @flags:
 134  *
 135  */
 136
 137 static void meta_go_inval(struct gfs2_glock *gl, int flags)
 138 {
 139         if (!(flags & DIO_METADATA))
 140                 return;
 141
 142         gfs2_meta_inval(gl);
 143         gl->gl_vn++;
 144 }
 145
 146 /**
 147  * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
 148  * @gl: the glock protecting the inode
 149  *
 150  */
 151
 152 static void inode_go_sync(struct gfs2_glock *gl)
 153 {
 154         struct gfs2_inode *ip = gl->gl_object;
 155
 156         if (ip && !S_ISREG(ip->i_inode.i_mode))
 157                 ip = NULL;
 158
 159         if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
 160                 gfs2_log_flush(gl->gl_sbd, gl);
 161                 if (ip)
 162                         filemap_fdatawrite(ip->i_inode.i_mapping);
 163                 gfs2_meta_sync(gl);
 164                 if (ip) {
 165                         struct address_space *mapping = ip->i_inode.i_mapping;
 166                         int error = filemap_fdatawait(mapping);
 167                         if (error == -ENOSPC)
 168                                 set_bit(AS_ENOSPC, &mapping->flags);
 169                         else if (error)
 170                                 set_bit(AS_EIO, &mapping->flags);
 171                 }
 172                 clear_bit(GLF_DIRTY, &gl->gl_flags);
 173                 gfs2_ail_empty_gl(gl);
 174         }
 175 }
 176
 177 /**
 178  * inode_go_xmote_th - promote/demote a glock
 179  * @gl: the glock
 180  * @state: the requested state
 181  * @flags:
 182  *
 183  */
 184
 185 static void inode_go_xmote_th(struct gfs2_glock *gl)
 186 {
 187         if (gl->gl_state != LM_ST_UNLOCKED)
 188                 gfs2_pte_inval(gl);
 189         if (gl->gl_state == LM_ST_EXCLUSIVE)
 190                 inode_go_sync(gl);
 191 }
 192
 193 /**
 194  * inode_go_xmote_bh - After promoting/demoting a glock
 195  * @gl: the glock
 196  *
 197  */
 198
 199 static void inode_go_xmote_bh(struct gfs2_glock *gl)
 200 {
 201         struct gfs2_holder *gh = gl->gl_req_gh;
 202         struct buffer_head *bh;
 203         int error;
 204
 205         if (gl->gl_state != LM_ST_UNLOCKED &&
 206             (!gh || !(gh->gh_flags & GL_SKIP))) {
 207                 error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);
 208                 if (!error)
 209                         brelse(bh);
 210         }
 211 }
 212
 213 /**
 214  * inode_go_drop_th - unlock a glock
 215  * @gl: the glock
 216  *
 217  * Invoked from rq_demote().
 218  * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
 219  * is being purged from our node's glock cache; we're dropping lock.
 220  */
 221
 222 static void inode_go_drop_th(struct gfs2_glock *gl)
 223 {
 224         gfs2_pte_inval(gl);
 225         if (gl->gl_state == LM_ST_EXCLUSIVE)
 226                 inode_go_sync(gl);
 227 }
 228
 229 /**
 230  * inode_go_inval - prepare a inode glock to be released
 231  * @gl: the glock
 232  * @flags:
 233  *
 234  */
 235
 236 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 237 {
 238         struct gfs2_inode *ip = gl->gl_object;
 239         int meta = (flags & DIO_METADATA);
 240
 241         if (meta) {
 242                 gfs2_meta_inval(gl);
 243                 if (ip)
 244                         set_bit(GIF_INVALID, &ip->i_flags);
 245         }
 246
 247         if (ip && S_ISREG(ip->i_inode.i_mode)) {
 248                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
 249                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), !ip->i_inode.i_mapping->nrpages);
 250                 clear_bit(GIF_PAGED, &ip->i_flags);
 251         }
 252 }
 253
 254 /**
 255  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 256  * @gl: the glock
 257  *
 258  * Returns: 1 if it's ok
 259  */
 260
 261 static int inode_go_demote_ok(struct gfs2_glock *gl)
 262 {
 263         struct gfs2_sbd *sdp = gl->gl_sbd;
 264         int demote = 0;
 265
 266         if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
 267                 demote = 1;
 268         else if (!sdp->sd_args.ar_localcaching &&
 269                  time_after_eq(jiffies, gl->gl_stamp +
 270                                gfs2_tune_get(sdp, gt_demote_secs) * HZ))
 271                 demote = 1;
 272
 273         return demote;
 274 }
 275
 276 /**
 277  * inode_go_lock - operation done after an inode lock is locked by a process
 278  * @gl: the glock
 279  * @flags:
 280  *
 281  * Returns: errno
 282  */
 283
 284 static int inode_go_lock(struct gfs2_holder *gh)
 285 {
 286         struct gfs2_glock *gl = gh->gh_gl;
 287         struct gfs2_inode *ip = gl->gl_object;
 288         int error = 0;
 289
 290         if (!ip)
 291                 return 0;
 292
 293         if (test_bit(GIF_INVALID, &ip->i_flags)) {
 294                 error = gfs2_inode_refresh(ip);
 295                 if (error)
 296                         return error;
 297         }
 298
 299         if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
 300             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 301             (gh->gh_state == LM_ST_EXCLUSIVE))
 302                 error = gfs2_truncatei_resume(ip);
 303
 304         return error;
 305 }
 306
 307 /**
 308  * inode_go_unlock - operation done before an inode lock is unlocked by a
 309  *                   process
 310  * @gl: the glock
 311  * @flags:
 312  *
 313  */
 314
 315 static void inode_go_unlock(struct gfs2_holder *gh)
 316 {
 317         struct gfs2_glock *gl = gh->gh_gl;
 318         struct gfs2_inode *ip = gl->gl_object;
 319
 320         if (ip)
 321                 gfs2_meta_cache_flush(ip);
 322 }
 323
 324 /**
 325  * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
 326  * @gl: the glock
 327  *
 328  * Returns: 1 if it's ok
 329  */
 330
 331 static int rgrp_go_demote_ok(struct gfs2_glock *gl)
 332 {
 333         return !gl->gl_aspace->i_mapping->nrpages;
 334 }
 335
 336 /**
 337  * rgrp_go_lock - operation done after an rgrp lock is locked by
 338  *    a first holder on this node.
 339  * @gl: the glock
 340  * @flags:
 341  *
 342  * Returns: errno
 343  */
 344
 345 static int rgrp_go_lock(struct gfs2_holder *gh)
 346 {
 347         return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
 348 }
 349
 350 /**
 351  * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
 352  *    a last holder on this node.
 353  * @gl: the glock
 354  * @flags:
 355  *
 356  */
 357
 358 static void rgrp_go_unlock(struct gfs2_holder *gh)
 359 {
 360         gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
 361 }
 362
 363 /**
 364  * trans_go_xmote_th - promote/demote the transaction glock
 365  * @gl: the glock
 366  * @state: the requested state
 367  * @flags:
 368  *
 369  */
 370
 371 static void trans_go_xmote_th(struct gfs2_glock *gl)
 372 {
 373         struct gfs2_sbd *sdp = gl->gl_sbd;
 374
 375         if (gl->gl_state != LM_ST_UNLOCKED &&
 376             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 377                 gfs2_meta_syncfs(sdp);
 378                 gfs2_log_shutdown(sdp);
 379         }
 380 }
 381
 382 /**
 383  * trans_go_xmote_bh - After promoting/demoting the transaction glock
 384  * @gl: the glock
 385  *
 386  */
 387
 388 static void trans_go_xmote_bh(struct gfs2_glock *gl)
 389 {
 390         struct gfs2_sbd *sdp = gl->gl_sbd;
 391         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 392         struct gfs2_glock *j_gl = ip->i_gl;
 393         struct gfs2_log_header_host head;
 394         int error;
 395
 396         if (gl->gl_state != LM_ST_UNLOCKED &&
 397             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 398                 gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));
 399                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 400
 401                 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 402                 if (error)
 403                         gfs2_consist(sdp);
 404                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
 405                         gfs2_consist(sdp);
 406
 407                 /*  Initialize some head of the log stuff  */
 408                 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
 409                         sdp->sd_log_sequence = head.lh_sequence + 1;
 410                         gfs2_log_pointers_init(sdp, head.lh_blkno);
 411                 }
 412         }
 413 }
 414
 415 /**
 416  * trans_go_drop_th - unlock the transaction glock
 417  * @gl: the glock
 418  *
 419  * We want to sync the device even with localcaching.  Remember
 420  * that localcaching journal replay only marks buffers dirty.
 421  */
 422
 423 static void trans_go_drop_th(struct gfs2_glock *gl)
 424 {
 425         struct gfs2_sbd *sdp = gl->gl_sbd;
 426
 427         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 428                 gfs2_meta_syncfs(sdp);
 429                 gfs2_log_shutdown(sdp);
 430         }
 431 }
 432
 433 /**
 434  * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
 435  * @gl: the glock
 436  *
 437  * Returns: 1 if it's ok
 438  */
 439
 440 static int quota_go_demote_ok(struct gfs2_glock *gl)
 441 {
 442         return !atomic_read(&gl->gl_lvb_count);
 443 }
 444
 445 const struct gfs2_glock_operations gfs2_meta_glops = {
 446         .go_xmote_th = meta_go_sync,
 447         .go_drop_th = meta_go_sync,
 448         .go_type = LM_TYPE_META,
 449 };
 450
 451 const struct gfs2_glock_operations gfs2_inode_glops = {
 452         .go_xmote_th = inode_go_xmote_th,
 453         .go_xmote_bh = inode_go_xmote_bh,
 454         .go_drop_th = inode_go_drop_th,
 455         .go_inval = inode_go_inval,
 456         .go_demote_ok = inode_go_demote_ok,
 457         .go_lock = inode_go_lock,
 458         .go_unlock = inode_go_unlock,
 459         .go_type = LM_TYPE_INODE,
 460 };
 461
 462 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 463         .go_inval = meta_go_inval,
 464         .go_demote_ok = rgrp_go_demote_ok,
 465         .go_lock = rgrp_go_lock,
 466         .go_unlock = rgrp_go_unlock,
 467         .go_type = LM_TYPE_RGRP,
 468 };
 469
 470 const struct gfs2_glock_operations gfs2_trans_glops = {
 471         .go_xmote_th = trans_go_xmote_th,
 472         .go_xmote_bh = trans_go_xmote_bh,
 473         .go_drop_th = trans_go_drop_th,
 474         .go_type = LM_TYPE_NONDISK,
 475 };
 476
 477 const struct gfs2_glock_operations gfs2_iopen_glops = {
 478         .go_type = LM_TYPE_IOPEN,
 479 };
 480
 481 const struct gfs2_glock_operations gfs2_flock_glops = {
 482         .go_type = LM_TYPE_FLOCK,
 483 };
 484
 485 const struct gfs2_glock_operations gfs2_nondisk_glops = {
 486         .go_type = LM_TYPE_NONDISK,
 487 };
 488
 489 const struct gfs2_glock_operations gfs2_quota_glops = {
 490         .go_demote_ok = quota_go_demote_ok,
 491         .go_type = LM_TYPE_QUOTA,
 492 };
 493
 494 const struct gfs2_glock_operations gfs2_journal_glops = {
 495         .go_type = LM_TYPE_JOURNAL,
 496 };
 497