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