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         int error;
  45
  46         blocks = atomic_read(&gl->gl_ail_count);
  47         if (!blocks)
  48                 return;
  49
  50         error = gfs2_trans_begin(sdp, 0, blocks);
  51         if (gfs2_assert_withdraw(sdp, !error))
  52                 return;
  53
  54         gfs2_log_lock(sdp);
  55         while (!list_empty(head)) {
  56                 bd = list_entry(head->next, struct gfs2_bufdata,
  57                                 bd_ail_gl_list);
  58                 bh = bd->bd_bh;
  59                 gfs2_remove_from_ail(NULL, bd);
  60                 bd->bd_bh = NULL;
  61                 bh->b_private = NULL;
  62                 bd->bd_blkno = bh->b_blocknr;
  63                 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
  64                 gfs2_trans_add_revoke(sdp, bd);
  65         }
  66         gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
  67         gfs2_log_unlock(sdp);
  68
  69         gfs2_trans_end(sdp);
  70         gfs2_log_flush(sdp, NULL);
  71 }
  72
  73 /**
  74  * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
  75  * @gl: the glock
  76  *
  77  */
  78
  79 static void gfs2_pte_inval(struct gfs2_glock *gl)
  80 {
  81         struct gfs2_inode *ip;
  82         struct inode *inode;
  83
  84         ip = gl->gl_object;
  85         inode = &ip->i_inode;
  86         if (!ip || !S_ISREG(inode->i_mode))
  87                 return;
  88
  89         if (!test_bit(GIF_PAGED, &ip->i_flags))
  90                 return;
  91
  92         unmap_shared_mapping_range(inode->i_mapping, 0, 0);
  93
  94         if (test_bit(GIF_SW_PAGED, &ip->i_flags))
  95                 set_bit(GLF_DIRTY, &gl->gl_flags);
  96
  97         clear_bit(GIF_SW_PAGED, &ip->i_flags);
  98 }
  99
 100 /**
 101  * meta_go_sync - sync out the metadata for this glock
 102  * @gl: the glock
 103  *
 104  * Called when demoting or unlocking an EX glock.  We must flush
 105  * to disk all dirty buffers/pages relating to this glock, and must not
 106  * not return to caller to demote/unlock the glock until I/O is complete.
 107  */
 108
 109 static void meta_go_sync(struct gfs2_glock *gl)
 110 {
 111         if (gl->gl_state != LM_ST_EXCLUSIVE)
 112                 return;
 113
 114         if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
 115                 gfs2_log_flush(gl->gl_sbd, gl);
 116                 gfs2_meta_sync(gl);
 117                 gfs2_ail_empty_gl(gl);
 118         }
 119 }
 120
 121 /**
 122  * meta_go_inval - invalidate the metadata for this glock
 123  * @gl: the glock
 124  * @flags:
 125  *
 126  */
 127
 128 static void meta_go_inval(struct gfs2_glock *gl, int flags)
 129 {
 130         if (!(flags & DIO_METADATA))
 131                 return;
 132
 133         gfs2_meta_inval(gl);
 134         gl->gl_vn++;
 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  *
 141  */
 142
 143 static void inode_go_sync(struct gfs2_glock *gl)
 144 {
 145         struct gfs2_inode *ip = gl->gl_object;
 146
 147         if (ip && !S_ISREG(ip->i_inode.i_mode))
 148                 ip = NULL;
 149
 150         if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
 151                 if (ip && !gfs2_is_jdata(ip))
 152                         filemap_fdatawrite(ip->i_inode.i_mapping);
 153                 gfs2_log_flush(gl->gl_sbd, gl);
 154                 if (ip && gfs2_is_jdata(ip))
 155                         filemap_fdatawrite(ip->i_inode.i_mapping);
 156                 gfs2_meta_sync(gl);
 157                 if (ip) {
 158                         struct address_space *mapping = ip->i_inode.i_mapping;
 159                         int error = filemap_fdatawait(mapping);
 160                         mapping_set_error(mapping, error);
 161                 }
 162                 clear_bit(GLF_DIRTY, &gl->gl_flags);
 163                 gfs2_ail_empty_gl(gl);
 164         }
 165 }
 166
 167 /**
 168  * inode_go_xmote_th - promote/demote a glock
 169  * @gl: the glock
 170  * @state: the requested state
 171  * @flags:
 172  *
 173  */
 174
 175 static void inode_go_xmote_th(struct gfs2_glock *gl)
 176 {
 177         if (gl->gl_state != LM_ST_UNLOCKED)
 178                 gfs2_pte_inval(gl);
 179         if (gl->gl_state == LM_ST_EXCLUSIVE)
 180                 inode_go_sync(gl);
 181 }
 182
 183 /**
 184  * inode_go_xmote_bh - After promoting/demoting a glock
 185  * @gl: the glock
 186  *
 187  */
 188
 189 static void inode_go_xmote_bh(struct gfs2_glock *gl)
 190 {
 191         struct gfs2_holder *gh = gl->gl_req_gh;
 192         struct buffer_head *bh;
 193         int error;
 194
 195         if (gl->gl_state != LM_ST_UNLOCKED &&
 196             (!gh || !(gh->gh_flags & GL_SKIP))) {
 197                 error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);
 198                 if (!error)
 199                         brelse(bh);
 200         }
 201 }
 202
 203 /**
 204  * inode_go_drop_th - unlock a glock
 205  * @gl: the glock
 206  *
 207  * Invoked from rq_demote().
 208  * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
 209  * is being purged from our node's glock cache; we're dropping lock.
 210  */
 211
 212 static void inode_go_drop_th(struct gfs2_glock *gl)
 213 {
 214         gfs2_pte_inval(gl);
 215         if (gl->gl_state == LM_ST_EXCLUSIVE)
 216                 inode_go_sync(gl);
 217 }
 218
 219 /**
 220  * inode_go_inval - prepare a inode glock to be released
 221  * @gl: the glock
 222  * @flags:
 223  *
 224  */
 225
 226 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 227 {
 228         struct gfs2_inode *ip = gl->gl_object;
 229         int meta = (flags & DIO_METADATA);
 230
 231         if (meta) {
 232                 gfs2_meta_inval(gl);
 233                 if (ip)
 234                         set_bit(GIF_INVALID, &ip->i_flags);
 235         }
 236
 237         if (ip && S_ISREG(ip->i_inode.i_mode)) {
 238                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
 239                 clear_bit(GIF_PAGED, &ip->i_flags);
 240         }
 241 }
 242
 243 /**
 244  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 245  * @gl: the glock
 246  *
 247  * Returns: 1 if it's ok
 248  */
 249
 250 static int inode_go_demote_ok(struct gfs2_glock *gl)
 251 {
 252         struct gfs2_sbd *sdp = gl->gl_sbd;
 253         int demote = 0;
 254
 255         if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
 256                 demote = 1;
 257         else if (!sdp->sd_args.ar_localcaching &&
 258                  time_after_eq(jiffies, gl->gl_stamp +
 259                                gfs2_tune_get(sdp, gt_demote_secs) * HZ))
 260                 demote = 1;
 261
 262         return demote;
 263 }
 264
 265 /**
 266  * inode_go_lock - operation done after an inode lock is locked by a process
 267  * @gl: the glock
 268  * @flags:
 269  *
 270  * Returns: errno
 271  */
 272
 273 static int inode_go_lock(struct gfs2_holder *gh)
 274 {
 275         struct gfs2_glock *gl = gh->gh_gl;
 276         struct gfs2_inode *ip = gl->gl_object;
 277         int error = 0;
 278
 279         if (!ip)
 280                 return 0;
 281
 282         if (test_bit(GIF_INVALID, &ip->i_flags)) {
 283                 error = gfs2_inode_refresh(ip);
 284                 if (error)
 285                         return error;
 286         }
 287
 288         if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
 289             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 290             (gh->gh_state == LM_ST_EXCLUSIVE))
 291                 error = gfs2_truncatei_resume(ip);
 292
 293         return error;
 294 }
 295
 296 /**
 297  * inode_go_unlock - operation done before an inode lock is unlocked by a
 298  *                   process
 299  * @gl: the glock
 300  * @flags:
 301  *
 302  */
 303
 304 static void inode_go_unlock(struct gfs2_holder *gh)
 305 {
 306         struct gfs2_glock *gl = gh->gh_gl;
 307         struct gfs2_inode *ip = gl->gl_object;
 308
 309         if (ip)
 310                 gfs2_meta_cache_flush(ip);
 311 }
 312
 313 /**
 314  * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
 315  * @gl: the glock
 316  *
 317  * Returns: 1 if it's ok
 318  */
 319
 320 static int rgrp_go_demote_ok(struct gfs2_glock *gl)
 321 {
 322         return !gl->gl_aspace->i_mapping->nrpages;
 323 }
 324
 325 /**
 326  * rgrp_go_lock - operation done after an rgrp lock is locked by
 327  *    a first holder on this node.
 328  * @gl: the glock
 329  * @flags:
 330  *
 331  * Returns: errno
 332  */
 333
 334 static int rgrp_go_lock(struct gfs2_holder *gh)
 335 {
 336         return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
 337 }
 338
 339 /**
 340  * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
 341  *    a last holder on this node.
 342  * @gl: the glock
 343  * @flags:
 344  *
 345  */
 346
 347 static void rgrp_go_unlock(struct gfs2_holder *gh)
 348 {
 349         gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
 350 }
 351
 352 /**
 353  * trans_go_xmote_th - promote/demote the transaction glock
 354  * @gl: the glock
 355  * @state: the requested state
 356  * @flags:
 357  *
 358  */
 359
 360 static void trans_go_xmote_th(struct gfs2_glock *gl)
 361 {
 362         struct gfs2_sbd *sdp = gl->gl_sbd;
 363
 364         if (gl->gl_state != LM_ST_UNLOCKED &&
 365             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 366                 gfs2_meta_syncfs(sdp);
 367                 gfs2_log_shutdown(sdp);
 368         }
 369 }
 370
 371 /**
 372  * trans_go_xmote_bh - After promoting/demoting the transaction glock
 373  * @gl: the glock
 374  *
 375  */
 376
 377 static void trans_go_xmote_bh(struct gfs2_glock *gl)
 378 {
 379         struct gfs2_sbd *sdp = gl->gl_sbd;
 380         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 381         struct gfs2_glock *j_gl = ip->i_gl;
 382         struct gfs2_log_header_host head;
 383         int error;
 384
 385         if (gl->gl_state != LM_ST_UNLOCKED &&
 386             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 387                 gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));
 388                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 389
 390                 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 391                 if (error)
 392                         gfs2_consist(sdp);
 393                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
 394                         gfs2_consist(sdp);
 395
 396                 /*  Initialize some head of the log stuff  */
 397                 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
 398                         sdp->sd_log_sequence = head.lh_sequence + 1;
 399                         gfs2_log_pointers_init(sdp, head.lh_blkno);
 400                 }
 401         }
 402 }
 403
 404 /**
 405  * trans_go_drop_th - unlock the transaction glock
 406  * @gl: the glock
 407  *
 408  * We want to sync the device even with localcaching.  Remember
 409  * that localcaching journal replay only marks buffers dirty.
 410  */
 411
 412 static void trans_go_drop_th(struct gfs2_glock *gl)
 413 {
 414         struct gfs2_sbd *sdp = gl->gl_sbd;
 415
 416         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 417                 gfs2_meta_syncfs(sdp);
 418                 gfs2_log_shutdown(sdp);
 419         }
 420 }
 421
 422 /**
 423  * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
 424  * @gl: the glock
 425  *
 426  * Returns: 1 if it's ok
 427  */
 428
 429 static int quota_go_demote_ok(struct gfs2_glock *gl)
 430 {
 431         return !atomic_read(&gl->gl_lvb_count);
 432 }
 433
 434 const struct gfs2_glock_operations gfs2_meta_glops = {
 435         .go_xmote_th = meta_go_sync,
 436         .go_drop_th = meta_go_sync,
 437         .go_type = LM_TYPE_META,
 438 };
 439
 440 const struct gfs2_glock_operations gfs2_inode_glops = {
 441         .go_xmote_th = inode_go_xmote_th,
 442         .go_xmote_bh = inode_go_xmote_bh,
 443         .go_drop_th = inode_go_drop_th,
 444         .go_inval = inode_go_inval,
 445         .go_demote_ok = inode_go_demote_ok,
 446         .go_lock = inode_go_lock,
 447         .go_unlock = inode_go_unlock,
 448         .go_type = LM_TYPE_INODE,
 449         .go_min_hold_time = HZ / 10,
 450 };
 451
 452 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 453         .go_xmote_th = meta_go_sync,
 454         .go_drop_th = meta_go_sync,
 455         .go_inval = meta_go_inval,
 456         .go_demote_ok = rgrp_go_demote_ok,
 457         .go_lock = rgrp_go_lock,
 458         .go_unlock = rgrp_go_unlock,
 459         .go_type = LM_TYPE_RGRP,
 460         .go_min_hold_time = HZ / 10,
 461 };
 462
 463 const struct gfs2_glock_operations gfs2_trans_glops = {
 464         .go_xmote_th = trans_go_xmote_th,
 465         .go_xmote_bh = trans_go_xmote_bh,
 466         .go_drop_th = trans_go_drop_th,
 467         .go_type = LM_TYPE_NONDISK,
 468 };
 469
 470 const struct gfs2_glock_operations gfs2_iopen_glops = {
 471         .go_type = LM_TYPE_IOPEN,
 472 };
 473
 474 const struct gfs2_glock_operations gfs2_flock_glops = {
 475         .go_type = LM_TYPE_FLOCK,
 476 };
 477
 478 const struct gfs2_glock_operations gfs2_nondisk_glops = {
 479         .go_type = LM_TYPE_NONDISK,
 480 };
 481
 482 const struct gfs2_glock_operations gfs2_quota_glops = {
 483         .go_demote_ok = quota_go_demote_ok,
 484         .go_type = LM_TYPE_QUOTA,
 485 };
 486
 487 const struct gfs2_glock_operations gfs2_journal_glops = {
 488         .go_type = LM_TYPE_JOURNAL,
 489 };
 490