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/spinlock.h>
  11 #include <linux/completion.h>
  12 #include <linux/buffer_head.h>
  13 #include <linux/gfs2_ondisk.h>
  14 #include <linux/bio.h>
  15 #include <linux/posix_acl.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         spin_lock(&sdp->sd_ail_lock);
  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                 spin_unlock(&sdp->sd_ail_lock);
  66
  67                 bd->bd_bh = NULL;
  68                 bh->b_private = NULL;
  69                 bd->bd_blkno = bh->b_blocknr;
  70                 gfs2_log_lock(sdp);
  71                 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
  72                 gfs2_trans_add_revoke(sdp, bd);
  73                 gfs2_log_unlock(sdp);
  74
  75                 spin_lock(&sdp->sd_ail_lock);
  76         }
  77         gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
  78         spin_unlock(&sdp->sd_ail_lock);
  79
  80         gfs2_trans_end(sdp);
  81         gfs2_log_flush(sdp, NULL);
  82 }
  83
  84 /**
  85  * rgrp_go_sync - sync out the metadata for this glock
  86  * @gl: the glock
  87  *
  88  * Called when demoting or unlocking an EX glock.  We must flush
  89  * to disk all dirty buffers/pages relating to this glock, and must not
  90  * not return to caller to demote/unlock the glock until I/O is complete.
  91  */
  92
  93 static void rgrp_go_sync(struct gfs2_glock *gl)
  94 {
  95         struct address_space *metamapping = gfs2_glock2aspace(gl);
  96         int error;
  97
  98         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
  99                 return;
 100         BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
 101
 102         gfs2_log_flush(gl->gl_sbd, gl);
 103         filemap_fdatawrite(metamapping);
 104         error = filemap_fdatawait(metamapping);
 105         mapping_set_error(metamapping, error);
 106         gfs2_ail_empty_gl(gl);
 107 }
 108
 109 /**
 110  * rgrp_go_inval - invalidate the metadata for this glock
 111  * @gl: the glock
 112  * @flags:
 113  *
 114  * We never used LM_ST_DEFERRED with resource groups, so that we
 115  * should always see the metadata flag set here.
 116  *
 117  */
 118
 119 static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
 120 {
 121         struct address_space *mapping = gfs2_glock2aspace(gl);
 122
 123         BUG_ON(!(flags & DIO_METADATA));
 124         gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
 125         truncate_inode_pages(mapping, 0);
 126
 127         if (gl->gl_object) {
 128                 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
 129                 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
 130         }
 131 }
 132
 133 /**
 134  * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
 135  * @gl: the glock protecting the inode
 136  *
 137  */
 138
 139 static void inode_go_sync(struct gfs2_glock *gl)
 140 {
 141         struct gfs2_inode *ip = gl->gl_object;
 142         struct address_space *metamapping = gfs2_glock2aspace(gl);
 143         int error;
 144
 145         if (ip && !S_ISREG(ip->i_inode.i_mode))
 146                 ip = NULL;
 147         if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
 148                 unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
 149         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
 150                 return;
 151
 152         BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
 153
 154         gfs2_log_flush(gl->gl_sbd, gl);
 155         filemap_fdatawrite(metamapping);
 156         if (ip) {
 157                 struct address_space *mapping = ip->i_inode.i_mapping;
 158                 filemap_fdatawrite(mapping);
 159                 error = filemap_fdatawait(mapping);
 160                 mapping_set_error(mapping, error);
 161         }
 162         error = filemap_fdatawait(metamapping);
 163         mapping_set_error(metamapping, error);
 164         gfs2_ail_empty_gl(gl);
 165         /*
 166          * Writeback of the data mapping may cause the dirty flag to be set
 167          * so we have to clear it again here.
 168          */
 169         smp_mb__before_clear_bit();
 170         clear_bit(GLF_DIRTY, &gl->gl_flags);
 171 }
 172
 173 /**
 174  * inode_go_inval - prepare a inode glock to be released
 175  * @gl: the glock
 176  * @flags:
 177  *
 178  * Normally we invlidate everything, but if we are moving into
 179  * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
 180  * can keep hold of the metadata, since it won't have changed.
 181  *
 182  */
 183
 184 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 185 {
 186         struct gfs2_inode *ip = gl->gl_object;
 187
 188         gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
 189
 190         if (flags & DIO_METADATA) {
 191                 struct address_space *mapping = gfs2_glock2aspace(gl);
 192                 truncate_inode_pages(mapping, 0);
 193                 if (ip) {
 194                         set_bit(GIF_INVALID, &ip->i_flags);
 195                         forget_all_cached_acls(&ip->i_inode);
 196                 }
 197         }
 198
 199         if (ip == GFS2_I(gl->gl_sbd->sd_rindex))
 200                 gl->gl_sbd->sd_rindex_uptodate = 0;
 201         if (ip && S_ISREG(ip->i_inode.i_mode))
 202                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
 203 }
 204
 205 /**
 206  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 207  * @gl: the glock
 208  *
 209  * Returns: 1 if it's ok
 210  */
 211
 212 static int inode_go_demote_ok(const struct gfs2_glock *gl)
 213 {
 214         struct gfs2_sbd *sdp = gl->gl_sbd;
 215         struct gfs2_holder *gh;
 216
 217         if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
 218                 return 0;
 219
 220         if (!list_empty(&gl->gl_holders)) {
 221                 gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
 222                 if (gh->gh_list.next != &gl->gl_holders)
 223                         return 0;
 224         }
 225
 226         return 1;
 227 }
 228
 229 /**
 230  * inode_go_lock - operation done after an inode lock is locked by a process
 231  * @gl: the glock
 232  * @flags:
 233  *
 234  * Returns: errno
 235  */
 236
 237 static int inode_go_lock(struct gfs2_holder *gh)
 238 {
 239         struct gfs2_glock *gl = gh->gh_gl;
 240         struct gfs2_sbd *sdp = gl->gl_sbd;
 241         struct gfs2_inode *ip = gl->gl_object;
 242         int error = 0;
 243
 244         if (!ip || (gh->gh_flags & GL_SKIP))
 245                 return 0;
 246
 247         if (test_bit(GIF_INVALID, &ip->i_flags)) {
 248                 error = gfs2_inode_refresh(ip);
 249                 if (error)
 250                         return error;
 251         }
 252
 253         if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
 254             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 255             (gh->gh_state == LM_ST_EXCLUSIVE)) {
 256                 spin_lock(&sdp->sd_trunc_lock);
 257                 if (list_empty(&ip->i_trunc_list))
 258                         list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
 259                 spin_unlock(&sdp->sd_trunc_lock);
 260                 wake_up(&sdp->sd_quota_wait);
 261                 return 1;
 262         }
 263
 264         return error;
 265 }
 266
 267 /**
 268  * inode_go_dump - print information about an inode
 269  * @seq: The iterator
 270  * @ip: the inode
 271  *
 272  * Returns: 0 on success, -ENOBUFS when we run out of space
 273  */
 274
 275 static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
 276 {
 277         const struct gfs2_inode *ip = gl->gl_object;
 278         if (ip == NULL)
 279                 return 0;
 280         gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu\n",
 281                   (unsigned long long)ip->i_no_formal_ino,
 282                   (unsigned long long)ip->i_no_addr,
 283                   IF2DT(ip->i_inode.i_mode), ip->i_flags,
 284                   (unsigned int)ip->i_diskflags,
 285                   (unsigned long long)i_size_read(&ip->i_inode));
 286         return 0;
 287 }
 288
 289 /**
 290  * rgrp_go_lock - operation done after an rgrp lock is locked by
 291  *    a first holder on this node.
 292  * @gl: the glock
 293  * @flags:
 294  *
 295  * Returns: errno
 296  */
 297
 298 static int rgrp_go_lock(struct gfs2_holder *gh)
 299 {
 300         return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
 301 }
 302
 303 /**
 304  * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
 305  *    a last holder on this node.
 306  * @gl: the glock
 307  * @flags:
 308  *
 309  */
 310
 311 static void rgrp_go_unlock(struct gfs2_holder *gh)
 312 {
 313         gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
 314 }
 315
 316 /**
 317  * trans_go_sync - promote/demote the transaction glock
 318  * @gl: the glock
 319  * @state: the requested state
 320  * @flags:
 321  *
 322  */
 323
 324 static void trans_go_sync(struct gfs2_glock *gl)
 325 {
 326         struct gfs2_sbd *sdp = gl->gl_sbd;
 327
 328         if (gl->gl_state != LM_ST_UNLOCKED &&
 329             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 330                 gfs2_meta_syncfs(sdp);
 331                 gfs2_log_shutdown(sdp);
 332         }
 333 }
 334
 335 /**
 336  * trans_go_xmote_bh - After promoting/demoting the transaction glock
 337  * @gl: the glock
 338  *
 339  */
 340
 341 static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
 342 {
 343         struct gfs2_sbd *sdp = gl->gl_sbd;
 344         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 345         struct gfs2_glock *j_gl = ip->i_gl;
 346         struct gfs2_log_header_host head;
 347         int error;
 348
 349         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 350                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 351
 352                 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 353                 if (error)
 354                         gfs2_consist(sdp);
 355                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
 356                         gfs2_consist(sdp);
 357
 358                 /*  Initialize some head of the log stuff  */
 359                 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
 360                         sdp->sd_log_sequence = head.lh_sequence + 1;
 361                         gfs2_log_pointers_init(sdp, head.lh_blkno);
 362                 }
 363         }
 364         return 0;
 365 }
 366
 367 /**
 368  * trans_go_demote_ok
 369  * @gl: the glock
 370  *
 371  * Always returns 0
 372  */
 373
 374 static int trans_go_demote_ok(const struct gfs2_glock *gl)
 375 {
 376         return 0;
 377 }
 378
 379 /**
 380  * iopen_go_callback - schedule the dcache entry for the inode to be deleted
 381  * @gl: the glock
 382  *
 383  * gl_spin lock is held while calling this
 384  */
 385 static void iopen_go_callback(struct gfs2_glock *gl)
 386 {
 387         struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;
 388
 389         if (gl->gl_demote_state == LM_ST_UNLOCKED &&
 390             gl->gl_state == LM_ST_SHARED && ip) {
 391                 gfs2_glock_hold(gl);
 392                 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
 393                         gfs2_glock_put_nolock(gl);
 394         }
 395 }
 396
 397 const struct gfs2_glock_operations gfs2_meta_glops = {
 398         .go_type = LM_TYPE_META,
 399 };
 400
 401 const struct gfs2_glock_operations gfs2_inode_glops = {
 402         .go_xmote_th = inode_go_sync,
 403         .go_inval = inode_go_inval,
 404         .go_demote_ok = inode_go_demote_ok,
 405         .go_lock = inode_go_lock,
 406         .go_dump = inode_go_dump,
 407         .go_type = LM_TYPE_INODE,
 408         .go_min_hold_time = HZ / 5,
 409         .go_flags = GLOF_ASPACE,
 410 };
 411
 412 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 413         .go_xmote_th = rgrp_go_sync,
 414         .go_inval = rgrp_go_inval,
 415         .go_lock = rgrp_go_lock,
 416         .go_unlock = rgrp_go_unlock,
 417         .go_dump = gfs2_rgrp_dump,
 418         .go_type = LM_TYPE_RGRP,
 419         .go_min_hold_time = HZ / 5,
 420         .go_flags = GLOF_ASPACE,
 421 };
 422
 423 const struct gfs2_glock_operations gfs2_trans_glops = {
 424         .go_xmote_th = trans_go_sync,
 425         .go_xmote_bh = trans_go_xmote_bh,
 426         .go_demote_ok = trans_go_demote_ok,
 427         .go_type = LM_TYPE_NONDISK,
 428 };
 429
 430 const struct gfs2_glock_operations gfs2_iopen_glops = {
 431         .go_type = LM_TYPE_IOPEN,
 432         .go_callback = iopen_go_callback,
 433 };
 434
 435 const struct gfs2_glock_operations gfs2_flock_glops = {
 436         .go_type = LM_TYPE_FLOCK,
 437 };
 438
 439 const struct gfs2_glock_operations gfs2_nondisk_glops = {
 440         .go_type = LM_TYPE_NONDISK,
 441 };
 442
 443 const struct gfs2_glock_operations gfs2_quota_glops = {
 444         .go_type = LM_TYPE_QUOTA,
 445 };
 446
 447 const struct gfs2_glock_operations gfs2_journal_glops = {
 448         .go_type = LM_TYPE_JOURNAL,
 449 };
 450
 451 const struct gfs2_glock_operations *gfs2_glops_list[] = {
 452         [LM_TYPE_META] = &gfs2_meta_glops,
 453         [LM_TYPE_INODE] = &gfs2_inode_glops,
 454         [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
 455         [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
 456         [LM_TYPE_FLOCK] = &gfs2_flock_glops,
 457         [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
 458         [LM_TYPE_QUOTA] = &gfs2_quota_glops,
 459         [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
 460 };
 461