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