fs/gfs2/glops.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2005 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 v.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 <asm/semaphore.h>
  17
  18 #include "gfs2.h"
  19 #include "lm_interface.h"
  20 #include "incore.h"
  21 #include "bmap.h"
  22 #include "glock.h"
  23 #include "glops.h"
  24 #include "inode.h"
  25 #include "log.h"
  26 #include "meta_io.h"
  27 #include "page.h"
  28 #include "recovery.h"
  29 #include "rgrp.h"
  30 #include "util.h"
  31
  32 /**
  33  * meta_go_sync - sync out the metadata for this glock
  34  * @gl: the glock
  35  * @flags: DIO_*
  36  *
  37  * Called when demoting or unlocking an EX glock.  We must flush
  38  * to disk all dirty buffers/pages relating to this glock, and must not
  39  * not return to caller to demote/unlock the glock until I/O is complete.
  40  */
  41
  42 static void meta_go_sync(struct gfs2_glock *gl, int flags)
  43 {
  44         if (!(flags & DIO_METADATA))
  45                 return;
  46
  47         if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
  48                 gfs2_log_flush_glock(gl);
  49                 gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
  50                 if (flags & DIO_RELEASE)
  51                         gfs2_ail_empty_gl(gl);
  52         }
  53
  54         clear_bit(GLF_SYNC, &gl->gl_flags);
  55 }
  56
  57 /**
  58  * meta_go_inval - invalidate the metadata for this glock
  59  * @gl: the glock
  60  * @flags:
  61  *
  62  */
  63
  64 static void meta_go_inval(struct gfs2_glock *gl, int flags)
  65 {
  66         if (!(flags & DIO_METADATA))
  67                 return;
  68
  69         gfs2_meta_inval(gl);
  70         gl->gl_vn++;
  71 }
  72
  73 /**
  74  * meta_go_demote_ok - Check to see if it's ok to unlock a glock
  75  * @gl: the glock
  76  *
  77  * Returns: 1 if we have no cached data; ok to demote meta glock
  78  */
  79
  80 static int meta_go_demote_ok(struct gfs2_glock *gl)
  81 {
  82         return !gl->gl_aspace->i_mapping->nrpages;
  83 }
  84
  85 /**
  86  * inode_go_xmote_th - promote/demote a glock
  87  * @gl: the glock
  88  * @state: the requested state
  89  * @flags:
  90  *
  91  */
  92
  93 static void inode_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
  94                               int flags)
  95 {
  96         if (gl->gl_state != LM_ST_UNLOCKED)
  97                 gfs2_pte_inval(gl);
  98         gfs2_glock_xmote_th(gl, state, flags);
  99 }
 100
 101 /**
 102  * inode_go_xmote_bh - After promoting/demoting a glock
 103  * @gl: the glock
 104  *
 105  */
 106
 107 static void inode_go_xmote_bh(struct gfs2_glock *gl)
 108 {
 109         struct gfs2_holder *gh = gl->gl_req_gh;
 110         struct buffer_head *bh;
 111         int error;
 112
 113         if (gl->gl_state != LM_ST_UNLOCKED &&
 114             (!gh || !(gh->gh_flags & GL_SKIP))) {
 115                 error = gfs2_meta_read(gl, gl->gl_name.ln_number, DIO_START,
 116                                        &bh);
 117                 if (!error)
 118                         brelse(bh);
 119         }
 120 }
 121
 122 /**
 123  * inode_go_drop_th - unlock a glock
 124  * @gl: the glock
 125  *
 126  * Invoked from rq_demote().
 127  * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
 128  * is being purged from our node's glock cache; we're dropping lock.
 129  */
 130
 131 static void inode_go_drop_th(struct gfs2_glock *gl)
 132 {
 133         gfs2_pte_inval(gl);
 134         gfs2_glock_drop_th(gl);
 135 }
 136
 137 /**
 138  * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
 139  * @gl: the glock protecting the inode
 140  * @flags:
 141  *
 142  */
 143
 144 static void inode_go_sync(struct gfs2_glock *gl, int flags)
 145 {
 146         int meta = (flags & DIO_METADATA);
 147         int data = (flags & DIO_DATA);
 148
 149         if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
 150                 if (meta && data) {
 151                         gfs2_page_sync(gl, flags | DIO_START);
 152                         gfs2_log_flush_glock(gl);
 153                         gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
 154                         gfs2_page_sync(gl, flags | DIO_WAIT);
 155                         clear_bit(GLF_DIRTY, &gl->gl_flags);
 156                 } else if (meta) {
 157                         gfs2_log_flush_glock(gl);
 158                         gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
 159                 } else if (data)
 160                         gfs2_page_sync(gl, flags | DIO_START | DIO_WAIT);
 161                 if (flags & DIO_RELEASE)
 162                         gfs2_ail_empty_gl(gl);
 163         }
 164
 165         clear_bit(GLF_SYNC, &gl->gl_flags);
 166 }
 167
 168 /**
 169  * inode_go_inval - prepare a inode glock to be released
 170  * @gl: the glock
 171  * @flags:
 172  *
 173  */
 174
 175 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 176 {
 177         int meta = (flags & DIO_METADATA);
 178         int data = (flags & DIO_DATA);
 179
 180         if (meta) {
 181                 gfs2_meta_inval(gl);
 182                 gl->gl_vn++;
 183         }
 184         if (data)
 185                 gfs2_page_inval(gl);
 186 }
 187
 188 /**
 189  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 190  * @gl: the glock
 191  *
 192  * Returns: 1 if it's ok
 193  */
 194
 195 static int inode_go_demote_ok(struct gfs2_glock *gl)
 196 {
 197         struct gfs2_sbd *sdp = gl->gl_sbd;
 198         int demote = 0;
 199
 200         if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
 201                 demote = 1;
 202         else if (!sdp->sd_args.ar_localcaching &&
 203                  time_after_eq(jiffies, gl->gl_stamp +
 204                                gfs2_tune_get(sdp, gt_demote_secs) * HZ))
 205                 demote = 1;
 206
 207         return demote;
 208 }
 209
 210 /**
 211  * inode_go_lock - operation done after an inode lock is locked by a process
 212  * @gl: the glock
 213  * @flags:
 214  *
 215  * Returns: errno
 216  */
 217
 218 static int inode_go_lock(struct gfs2_holder *gh)
 219 {
 220         struct gfs2_glock *gl = gh->gh_gl;
 221         struct gfs2_inode *ip = gl->gl_object;
 222         int error = 0;
 223
 224         if (!ip)
 225                 return 0;
 226
 227         if (ip->i_vn != gl->gl_vn) {
 228                 error = gfs2_inode_refresh(ip);
 229                 if (error)
 230                         return error;
 231                 gfs2_inode_attr_in(ip);
 232         }
 233
 234         if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
 235             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 236             (gh->gh_flags & GL_LOCAL_EXCL))
 237                 error = gfs2_truncatei_resume(ip);
 238
 239         return error;
 240 }
 241
 242 /**
 243  * inode_go_unlock - operation done before an inode lock is unlocked by a
 244  *                   process
 245  * @gl: the glock
 246  * @flags:
 247  *
 248  */
 249
 250 static void inode_go_unlock(struct gfs2_holder *gh)
 251 {
 252         struct gfs2_glock *gl = gh->gh_gl;
 253         struct gfs2_inode *ip = gl->gl_object;
 254
 255         if (ip && test_bit(GLF_DIRTY, &gl->gl_flags))
 256                 gfs2_inode_attr_in(ip);
 257
 258         if (ip)
 259                 gfs2_meta_cache_flush(ip);
 260 }
 261
 262 /**
 263  * inode_greedy -
 264  * @gl: the glock
 265  *
 266  */
 267
 268 static void inode_greedy(struct gfs2_glock *gl)
 269 {
 270         struct gfs2_sbd *sdp = gl->gl_sbd;
 271         struct gfs2_inode *ip = gl->gl_object;
 272         unsigned int quantum = gfs2_tune_get(sdp, gt_greedy_quantum);
 273         unsigned int max = gfs2_tune_get(sdp, gt_greedy_max);
 274         unsigned int new_time;
 275
 276         spin_lock(&ip->i_spin);
 277
 278         if (time_after(ip->i_last_pfault + quantum, jiffies)) {
 279                 new_time = ip->i_greedy + quantum;
 280                 if (new_time > max)
 281                         new_time = max;
 282         } else {
 283                 new_time = ip->i_greedy - quantum;
 284                 if (!new_time || new_time > max)
 285                         new_time = 1;
 286         }
 287
 288         ip->i_greedy = new_time;
 289
 290         spin_unlock(&ip->i_spin);
 291
 292         gfs2_inode_put(ip);
 293 }
 294
 295 /**
 296  * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
 297  * @gl: the glock
 298  *
 299  * Returns: 1 if it's ok
 300  */
 301
 302 static int rgrp_go_demote_ok(struct gfs2_glock *gl)
 303 {
 304         return !gl->gl_aspace->i_mapping->nrpages;
 305 }
 306
 307 /**
 308  * rgrp_go_lock - operation done after an rgrp lock is locked by
 309  *    a first holder on this node.
 310  * @gl: the glock
 311  * @flags:
 312  *
 313  * Returns: errno
 314  */
 315
 316 static int rgrp_go_lock(struct gfs2_holder *gh)
 317 {
 318         return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
 319 }
 320
 321 /**
 322  * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
 323  *    a last holder on this node.
 324  * @gl: the glock
 325  * @flags:
 326  *
 327  */
 328
 329 static void rgrp_go_unlock(struct gfs2_holder *gh)
 330 {
 331         gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
 332 }
 333
 334 /**
 335  * trans_go_xmote_th - promote/demote the transaction glock
 336  * @gl: the glock
 337  * @state: the requested state
 338  * @flags:
 339  *
 340  */
 341
 342 static void trans_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
 343                               int flags)
 344 {
 345         struct gfs2_sbd *sdp = gl->gl_sbd;
 346
 347         if (gl->gl_state != LM_ST_UNLOCKED &&
 348             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 349                 gfs2_meta_syncfs(sdp);
 350                 gfs2_log_shutdown(sdp);
 351         }
 352
 353         gfs2_glock_xmote_th(gl, state, flags);
 354 }
 355
 356 /**
 357  * trans_go_xmote_bh - After promoting/demoting the transaction glock
 358  * @gl: the glock
 359  *
 360  */
 361
 362 static void trans_go_xmote_bh(struct gfs2_glock *gl)
 363 {
 364         struct gfs2_sbd *sdp = gl->gl_sbd;
 365         struct gfs2_inode *ip = sdp->sd_jdesc->jd_inode->u.generic_ip;
 366         struct gfs2_glock *j_gl = ip->i_gl;
 367         struct gfs2_log_header head;
 368         int error;
 369
 370         if (gl->gl_state != LM_ST_UNLOCKED &&
 371             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 372                 gfs2_meta_cache_flush(sdp->sd_jdesc->jd_inode->u.generic_ip);
 373                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA | DIO_DATA);
 374
 375                 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 376                 if (error)
 377                         gfs2_consist(sdp);
 378                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
 379                         gfs2_consist(sdp);
 380
 381                 /*  Initialize some head of the log stuff  */
 382                 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
 383                         sdp->sd_log_sequence = head.lh_sequence + 1;
 384                         gfs2_log_pointers_init(sdp, head.lh_blkno);
 385                 }
 386         }
 387 }
 388
 389 /**
 390  * trans_go_drop_th - unlock the transaction glock
 391  * @gl: the glock
 392  *
 393  * We want to sync the device even with localcaching.  Remember
 394  * that localcaching journal replay only marks buffers dirty.
 395  */
 396
 397 static void trans_go_drop_th(struct gfs2_glock *gl)
 398 {
 399         struct gfs2_sbd *sdp = gl->gl_sbd;
 400
 401         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 402                 gfs2_meta_syncfs(sdp);
 403                 gfs2_log_shutdown(sdp);
 404         }
 405
 406         gfs2_glock_drop_th(gl);
 407 }
 408
 409 /**
 410  * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
 411  * @gl: the glock
 412  *
 413  * Returns: 1 if it's ok
 414  */
 415
 416 static int quota_go_demote_ok(struct gfs2_glock *gl)
 417 {
 418         return !atomic_read(&gl->gl_lvb_count);
 419 }
 420
 421 struct gfs2_glock_operations gfs2_meta_glops = {
 422         .go_xmote_th = gfs2_glock_xmote_th,
 423         .go_drop_th = gfs2_glock_drop_th,
 424         .go_sync = meta_go_sync,
 425         .go_inval = meta_go_inval,
 426         .go_demote_ok = meta_go_demote_ok,
 427         .go_type = LM_TYPE_META
 428 };
 429
 430 struct gfs2_glock_operations gfs2_inode_glops = {
 431         .go_xmote_th = inode_go_xmote_th,
 432         .go_xmote_bh = inode_go_xmote_bh,
 433         .go_drop_th = inode_go_drop_th,
 434         .go_sync = inode_go_sync,
 435         .go_inval = inode_go_inval,
 436         .go_demote_ok = inode_go_demote_ok,
 437         .go_lock = inode_go_lock,
 438         .go_unlock = inode_go_unlock,
 439         .go_greedy = inode_greedy,
 440         .go_type = LM_TYPE_INODE
 441 };
 442
 443 struct gfs2_glock_operations gfs2_rgrp_glops = {
 444         .go_xmote_th = gfs2_glock_xmote_th,
 445         .go_drop_th = gfs2_glock_drop_th,
 446         .go_sync = meta_go_sync,
 447         .go_inval = meta_go_inval,
 448         .go_demote_ok = rgrp_go_demote_ok,
 449         .go_lock = rgrp_go_lock,
 450         .go_unlock = rgrp_go_unlock,
 451         .go_type = LM_TYPE_RGRP
 452 };
 453
 454 struct gfs2_glock_operations gfs2_trans_glops = {
 455         .go_xmote_th = trans_go_xmote_th,
 456         .go_xmote_bh = trans_go_xmote_bh,
 457         .go_drop_th = trans_go_drop_th,
 458         .go_type = LM_TYPE_NONDISK
 459 };
 460
 461 struct gfs2_glock_operations gfs2_iopen_glops = {
 462         .go_xmote_th = gfs2_glock_xmote_th,
 463         .go_drop_th = gfs2_glock_drop_th,
 464         .go_callback = gfs2_iopen_go_callback,
 465         .go_type = LM_TYPE_IOPEN
 466 };
 467
 468 struct gfs2_glock_operations gfs2_flock_glops = {
 469         .go_xmote_th = gfs2_glock_xmote_th,
 470         .go_drop_th = gfs2_glock_drop_th,
 471         .go_type = LM_TYPE_FLOCK
 472 };
 473
 474 struct gfs2_glock_operations gfs2_nondisk_glops = {
 475         .go_xmote_th = gfs2_glock_xmote_th,
 476         .go_drop_th = gfs2_glock_drop_th,
 477         .go_type = LM_TYPE_NONDISK
 478 };
 479
 480 struct gfs2_glock_operations gfs2_quota_glops = {
 481         .go_xmote_th = gfs2_glock_xmote_th,
 482         .go_drop_th = gfs2_glock_drop_th,
 483         .go_demote_ok = quota_go_demote_ok,
 484         .go_type = LM_TYPE_QUOTA
 485 };
 486
 487 struct gfs2_glock_operations gfs2_journal_glops = {
 488         .go_xmote_th = gfs2_glock_xmote_th,
 489         .go_drop_th = gfs2_glock_drop_th,
 490         .go_type = LM_TYPE_JOURNAL
 491 };
 492