fs/gfs2/glops.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2008 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/bio.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         struct list_head *head = &gl->gl_ail_list;
  41         struct gfs2_bufdata *bd;
  42         struct buffer_head *bh;
  43         struct gfs2_trans tr;
  44
  45         memset(&tr, 0, sizeof(tr));
  46         tr.tr_revokes = atomic_read(&gl->gl_ail_count);
  47
  48         if (!tr.tr_revokes)
  49                 return;
  50
  51         /* A shortened, inline version of gfs2_trans_begin() */
  52         tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
  53         tr.tr_ip = (unsigned long)__builtin_return_address(0);
  54         INIT_LIST_HEAD(&tr.tr_list_buf);
  55         gfs2_log_reserve(sdp, tr.tr_reserved);
  56         BUG_ON(current->journal_info);
  57         current->journal_info = &tr;
  58
  59         gfs2_log_lock(sdp);
  60         while (!list_empty(head)) {
  61                 bd = list_entry(head->next, struct gfs2_bufdata,
  62                                 bd_ail_gl_list);
  63                 bh = bd->bd_bh;
  64                 gfs2_remove_from_ail(bd);
  65                 bd->bd_bh = NULL;
  66                 bh->b_private = NULL;
  67                 bd->bd_blkno = bh->b_blocknr;
  68                 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
  69                 gfs2_trans_add_revoke(sdp, bd);
  70         }
  71         gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
  72         gfs2_log_unlock(sdp);
  73
  74         gfs2_trans_end(sdp);
  75         gfs2_log_flush(sdp, NULL);
  76 }
  77
  78 /**
  79  * rgrp_go_sync - sync out the metadata for this glock
  80  * @gl: the glock
  81  *
  82  * Called when demoting or unlocking an EX glock.  We must flush
  83  * to disk all dirty buffers/pages relating to this glock, and must not
  84  * not return to caller to demote/unlock the glock until I/O is complete.
  85  */
  86
  87 static void rgrp_go_sync(struct gfs2_glock *gl)
  88 {
  89         struct address_space *metamapping = gl->gl_aspace->i_mapping;
  90         int error;
  91
  92         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
  93                 return;
  94         BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
  95
  96         gfs2_log_flush(gl->gl_sbd, gl);
  97         filemap_fdatawrite(metamapping);
  98         error = filemap_fdatawait(metamapping);
  99         mapping_set_error(metamapping, error);
 100         gfs2_ail_empty_gl(gl);
 101 }
 102
 103 /**
 104  * rgrp_go_inval - invalidate the metadata for this glock
 105  * @gl: the glock
 106  * @flags:
 107  *
 108  * We never used LM_ST_DEFERRED with resource groups, so that we
 109  * should always see the metadata flag set here.
 110  *
 111  */
 112
 113 static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
 114 {
 115         struct address_space *mapping = gl->gl_aspace->i_mapping;
 116
 117         BUG_ON(!(flags & DIO_METADATA));
 118         gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
 119         truncate_inode_pages(mapping, 0);
 120
 121         if (gl->gl_object) {
 122                 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
 123                 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
 124         }
 125 }
 126
 127 /**
 128  * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
 129  * @gl: the glock protecting the inode
 130  *
 131  */
 132
 133 static void inode_go_sync(struct gfs2_glock *gl)
 134 {
 135         struct gfs2_inode *ip = gl->gl_object;
 136         struct address_space *metamapping = gl->gl_aspace->i_mapping;
 137         int error;
 138
 139         if (ip && !S_ISREG(ip->i_inode.i_mode))
 140                 ip = NULL;
 141         if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
 142                 unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
 143         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
 144                 return;
 145
 146         BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
 147
 148         gfs2_log_flush(gl->gl_sbd, gl);
 149         filemap_fdatawrite(metamapping);
 150         if (ip) {
 151                 struct address_space *mapping = ip->i_inode.i_mapping;
 152                 filemap_fdatawrite(mapping);
 153                 error = filemap_fdatawait(mapping);
 154                 mapping_set_error(mapping, error);
 155         }
 156         error = filemap_fdatawait(metamapping);
 157         mapping_set_error(metamapping, error);
 158         gfs2_ail_empty_gl(gl);
 159 }
 160
 161 /**
 162  * inode_go_inval - prepare a inode glock to be released
 163  * @gl: the glock
 164  * @flags:
 165  *
 166  * Normally we invlidate everything, but if we are moving into
 167  * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
 168  * can keep hold of the metadata, since it won't have changed.
 169  *
 170  */
 171
 172 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 173 {
 174         struct gfs2_inode *ip = gl->gl_object;
 175
 176         gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
 177
 178         if (flags & DIO_METADATA) {
 179                 struct address_space *mapping = gl->gl_aspace->i_mapping;
 180                 truncate_inode_pages(mapping, 0);
 181                 if (ip)
 182                         set_bit(GIF_INVALID, &ip->i_flags);
 183         }
 184
 185         if (ip == GFS2_I(gl->gl_sbd->sd_rindex))
 186                 gl->gl_sbd->sd_rindex_uptodate = 0;
 187         if (ip && S_ISREG(ip->i_inode.i_mode))
 188                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
 189 }
 190
 191 /**
 192  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 193  * @gl: the glock
 194  *
 195  * Returns: 1 if it's ok
 196  */
 197
 198 static int inode_go_demote_ok(const struct gfs2_glock *gl)
 199 {
 200         struct gfs2_sbd *sdp = gl->gl_sbd;
 201         if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
 202                 return 0;
 203         return 1;
 204 }
 205
 206 /**
 207  * inode_go_lock - operation done after an inode lock is locked by a process
 208  * @gl: the glock
 209  * @flags:
 210  *
 211  * Returns: errno
 212  */
 213
 214 static int inode_go_lock(struct gfs2_holder *gh)
 215 {
 216         struct gfs2_glock *gl = gh->gh_gl;
 217         struct gfs2_sbd *sdp = gl->gl_sbd;
 218         struct gfs2_inode *ip = gl->gl_object;
 219         int error = 0;
 220
 221         if (!ip || (gh->gh_flags & GL_SKIP))
 222                 return 0;
 223
 224         if (test_bit(GIF_INVALID, &ip->i_flags)) {
 225                 error = gfs2_inode_refresh(ip);
 226                 if (error)
 227                         return error;
 228         }
 229
 230         if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
 231             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 232             (gh->gh_state == LM_ST_EXCLUSIVE)) {
 233                 spin_lock(&sdp->sd_trunc_lock);
 234                 if (list_empty(&ip->i_trunc_list))
 235                         list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
 236                 spin_unlock(&sdp->sd_trunc_lock);
 237                 wake_up(&sdp->sd_quota_wait);
 238                 return 1;
 239         }
 240
 241         return error;
 242 }
 243
 244 /**
 245  * inode_go_dump - print information about an inode
 246  * @seq: The iterator
 247  * @ip: the inode
 248  *
 249  * Returns: 0 on success, -ENOBUFS when we run out of space
 250  */
 251
 252 static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
 253 {
 254         const struct gfs2_inode *ip = gl->gl_object;
 255         if (ip == NULL)
 256                 return 0;
 257         gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu/%llu\n",
 258                   (unsigned long long)ip->i_no_formal_ino,
 259                   (unsigned long long)ip->i_no_addr,
 260                   IF2DT(ip->i_inode.i_mode), ip->i_flags,
 261                   (unsigned int)ip->i_diskflags,
 262                   (unsigned long long)ip->i_inode.i_size,
 263                   (unsigned long long)ip->i_disksize);
 264         return 0;
 265 }
 266
 267 /**
 268  * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
 269  * @gl: the glock
 270  *
 271  * Returns: 1 if it's ok
 272  */
 273
 274 static int rgrp_go_demote_ok(const struct gfs2_glock *gl)
 275 {
 276         return !gl->gl_aspace->i_mapping->nrpages;
 277 }
 278
 279 /**
 280  * rgrp_go_lock - operation done after an rgrp lock is locked by
 281  *    a first holder on this node.
 282  * @gl: the glock
 283  * @flags:
 284  *
 285  * Returns: errno
 286  */
 287
 288 static int rgrp_go_lock(struct gfs2_holder *gh)
 289 {
 290         return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
 291 }
 292
 293 /**
 294  * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
 295  *    a last holder on this node.
 296  * @gl: the glock
 297  * @flags:
 298  *
 299  */
 300
 301 static void rgrp_go_unlock(struct gfs2_holder *gh)
 302 {
 303         gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
 304 }
 305
 306 /**
 307  * rgrp_go_dump - print out an rgrp
 308  * @seq: The iterator
 309  * @gl: The glock in question
 310  *
 311  */
 312
 313 static int rgrp_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
 314 {
 315         const struct gfs2_rgrpd *rgd = gl->gl_object;
 316         if (rgd == NULL)
 317                 return 0;
 318         gfs2_print_dbg(seq, " R: n:%llu f:%02x b:%u/%u i:%u\n",
 319                        (unsigned long long)rgd->rd_addr, rgd->rd_flags,
 320                        rgd->rd_free, rgd->rd_free_clone, rgd->rd_dinodes);
 321         return 0;
 322 }
 323
 324 /**
 325  * trans_go_sync - promote/demote the transaction glock
 326  * @gl: the glock
 327  * @state: the requested state
 328  * @flags:
 329  *
 330  */
 331
 332 static void trans_go_sync(struct gfs2_glock *gl)
 333 {
 334         struct gfs2_sbd *sdp = gl->gl_sbd;
 335
 336         if (gl->gl_state != LM_ST_UNLOCKED &&
 337             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 338                 gfs2_meta_syncfs(sdp);
 339                 gfs2_log_shutdown(sdp);
 340         }
 341 }
 342
 343 /**
 344  * trans_go_xmote_bh - After promoting/demoting the transaction glock
 345  * @gl: the glock
 346  *
 347  */
 348
 349 static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
 350 {
 351         struct gfs2_sbd *sdp = gl->gl_sbd;
 352         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 353         struct gfs2_glock *j_gl = ip->i_gl;
 354         struct gfs2_log_header_host head;
 355         int error;
 356
 357         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 358                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 359
 360                 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 361                 if (error)
 362                         gfs2_consist(sdp);
 363                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
 364                         gfs2_consist(sdp);
 365
 366                 /*  Initialize some head of the log stuff  */
 367                 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
 368                         sdp->sd_log_sequence = head.lh_sequence + 1;
 369                         gfs2_log_pointers_init(sdp, head.lh_blkno);
 370                 }
 371         }
 372         return 0;
 373 }
 374
 375 /**
 376  * trans_go_demote_ok
 377  * @gl: the glock
 378  *
 379  * Always returns 0
 380  */
 381
 382 static int trans_go_demote_ok(const struct gfs2_glock *gl)
 383 {
 384         return 0;
 385 }
 386
 387 const struct gfs2_glock_operations gfs2_meta_glops = {
 388         .go_type = LM_TYPE_META,
 389 };
 390
 391 const struct gfs2_glock_operations gfs2_inode_glops = {
 392         .go_xmote_th = inode_go_sync,
 393         .go_inval = inode_go_inval,
 394         .go_demote_ok = inode_go_demote_ok,
 395         .go_lock = inode_go_lock,
 396         .go_dump = inode_go_dump,
 397         .go_type = LM_TYPE_INODE,
 398         .go_min_hold_time = HZ / 5,
 399 };
 400
 401 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 402         .go_xmote_th = rgrp_go_sync,
 403         .go_inval = rgrp_go_inval,
 404         .go_demote_ok = rgrp_go_demote_ok,
 405         .go_lock = rgrp_go_lock,
 406         .go_unlock = rgrp_go_unlock,
 407         .go_dump = rgrp_go_dump,
 408         .go_type = LM_TYPE_RGRP,
 409         .go_min_hold_time = HZ / 5,
 410 };
 411
 412 const struct gfs2_glock_operations gfs2_trans_glops = {
 413         .go_xmote_th = trans_go_sync,
 414         .go_xmote_bh = trans_go_xmote_bh,
 415         .go_demote_ok = trans_go_demote_ok,
 416         .go_type = LM_TYPE_NONDISK,
 417 };
 418
 419 const struct gfs2_glock_operations gfs2_iopen_glops = {
 420         .go_type = LM_TYPE_IOPEN,
 421 };
 422
 423 const struct gfs2_glock_operations gfs2_flock_glops = {
 424         .go_type = LM_TYPE_FLOCK,
 425 };
 426
 427 const struct gfs2_glock_operations gfs2_nondisk_glops = {
 428         .go_type = LM_TYPE_NONDISK,
 429 };
 430
 431 const struct gfs2_glock_operations gfs2_quota_glops = {
 432         .go_type = LM_TYPE_QUOTA,
 433 };
 434
 435 const struct gfs2_glock_operations gfs2_journal_glops = {
 436         .go_type = LM_TYPE_JOURNAL,
 437 };
 438
 439 const struct gfs2_glock_operations *gfs2_glops_list[] = {
 440         [LM_TYPE_META] = &gfs2_meta_glops,
 441         [LM_TYPE_INODE] = &gfs2_inode_glops,
 442         [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
 443         [LM_TYPE_NONDISK] = &gfs2_trans_glops,
 444         [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
 445         [LM_TYPE_FLOCK] = &gfs2_flock_glops,
 446         [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
 447         [LM_TYPE_QUOTA] = &gfs2_quota_glops,
 448         [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
 449 };
 450