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 #include <linux/posix_acl.h>
  17
  18 #include "gfs2.h"
  19 #include "incore.h"
  20 #include "bmap.h"
  21 #include "glock.h"
  22 #include "glops.h"
  23 #include "inode.h"
  24 #include "log.h"
  25 #include "meta_io.h"
  26 #include "recovery.h"
  27 #include "rgrp.h"
  28 #include "util.h"
  29 #include "trans.h"
  30
  31 /**
  32  * ail_empty_gl - remove all buffers for a given lock from the AIL
  33  * @gl: the glock
  34  *
  35  * None of the buffers should be dirty, locked, or pinned.
  36  */
  37
  38 static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
  39 {
  40         struct gfs2_sbd *sdp = gl->gl_sbd;
  41         struct list_head *head = &gl->gl_ail_list;
  42         struct gfs2_bufdata *bd;
  43         struct buffer_head *bh;
  44         struct gfs2_trans tr;
  45
  46         memset(&tr, 0, sizeof(tr));
  47         tr.tr_revokes = atomic_read(&gl->gl_ail_count);
  48
  49         if (!tr.tr_revokes)
  50                 return;
  51
  52         /* A shortened, inline version of gfs2_trans_begin() */
  53         tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
  54         tr.tr_ip = (unsigned long)__builtin_return_address(0);
  55         INIT_LIST_HEAD(&tr.tr_list_buf);
  56         gfs2_log_reserve(sdp, tr.tr_reserved);
  57         BUG_ON(current->journal_info);
  58         current->journal_info = &tr;
  59
  60         gfs2_log_lock(sdp);
  61         while (!list_empty(head)) {
  62                 bd = list_entry(head->next, struct gfs2_bufdata,
  63                                 bd_ail_gl_list);
  64                 bh = bd->bd_bh;
  65                 gfs2_remove_from_ail(bd);
  66                 bd->bd_bh = NULL;
  67                 bh->b_private = NULL;
  68                 bd->bd_blkno = bh->b_blocknr;
  69                 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
  70                 gfs2_trans_add_revoke(sdp, bd);
  71         }
  72         gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
  73         gfs2_log_unlock(sdp);
  74
  75         gfs2_trans_end(sdp);
  76         gfs2_log_flush(sdp, NULL);
  77 }
  78
  79 /**
  80  * rgrp_go_sync - sync out the metadata for this glock
  81  * @gl: the glock
  82  *
  83  * Called when demoting or unlocking an EX glock.  We must flush
  84  * to disk all dirty buffers/pages relating to this glock, and must not
  85  * not return to caller to demote/unlock the glock until I/O is complete.
  86  */
  87
  88 static void rgrp_go_sync(struct gfs2_glock *gl)
  89 {
  90         struct address_space *metamapping = gl->gl_aspace->i_mapping;
  91         int error;
  92
  93         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
  94                 return;
  95         BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
  96
  97         gfs2_log_flush(gl->gl_sbd, gl);
  98         filemap_fdatawrite(metamapping);
  99         error = filemap_fdatawait(metamapping);
 100         mapping_set_error(metamapping, error);
 101         gfs2_ail_empty_gl(gl);
 102 }
 103
 104 /**
 105  * rgrp_go_inval - invalidate the metadata for this glock
 106  * @gl: the glock
 107  * @flags:
 108  *
 109  * We never used LM_ST_DEFERRED with resource groups, so that we
 110  * should always see the metadata flag set here.
 111  *
 112  */
 113
 114 static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
 115 {
 116         struct address_space *mapping = gl->gl_aspace->i_mapping;
 117
 118         BUG_ON(!(flags & DIO_METADATA));
 119         gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
 120         truncate_inode_pages(mapping, 0);
 121
 122         if (gl->gl_object) {
 123                 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
 124                 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
 125         }
 126 }
 127
 128 /**
 129  * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
 130  * @gl: the glock protecting the inode
 131  *
 132  */
 133
 134 static void inode_go_sync(struct gfs2_glock *gl)
 135 {
 136         struct gfs2_inode *ip = gl->gl_object;
 137         struct address_space *metamapping = gl->gl_aspace->i_mapping;
 138         int error;
 139
 140         if (ip && !S_ISREG(ip->i_inode.i_mode))
 141                 ip = NULL;
 142         if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
 143                 unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
 144         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
 145                 return;
 146
 147         BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
 148
 149         gfs2_log_flush(gl->gl_sbd, gl);
 150         filemap_fdatawrite(metamapping);
 151         if (ip) {
 152                 struct address_space *mapping = ip->i_inode.i_mapping;
 153                 filemap_fdatawrite(mapping);
 154                 error = filemap_fdatawait(mapping);
 155                 mapping_set_error(mapping, error);
 156         }
 157         error = filemap_fdatawait(metamapping);
 158         mapping_set_error(metamapping, error);
 159         gfs2_ail_empty_gl(gl);
 160         /*
 161          * Writeback of the data mapping may cause the dirty flag to be set
 162          * so we have to clear it again here.
 163          */
 164         smp_mb__before_clear_bit();
 165         clear_bit(GLF_DIRTY, &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  * Normally we invlidate everything, but if we are moving into
 174  * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
 175  * can keep hold of the metadata, since it won't have changed.
 176  *
 177  */
 178
 179 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 180 {
 181         struct gfs2_inode *ip = gl->gl_object;
 182
 183         gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
 184
 185         if (flags & DIO_METADATA) {
 186                 struct address_space *mapping = gl->gl_aspace->i_mapping;
 187                 truncate_inode_pages(mapping, 0);
 188                 if (ip) {
 189                         set_bit(GIF_INVALID, &ip->i_flags);
 190                         forget_all_cached_acls(&ip->i_inode);
 191                 }
 192         }
 193
 194         if (ip == GFS2_I(gl->gl_sbd->sd_rindex))
 195                 gl->gl_sbd->sd_rindex_uptodate = 0;
 196         if (ip && S_ISREG(ip->i_inode.i_mode))
 197                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
 198 }
 199
 200 /**
 201  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 202  * @gl: the glock
 203  *
 204  * Returns: 1 if it's ok
 205  */
 206
 207 static int inode_go_demote_ok(const struct gfs2_glock *gl)
 208 {
 209         struct gfs2_sbd *sdp = gl->gl_sbd;
 210         if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
 211                 return 0;
 212         return 1;
 213 }
 214
 215 /**
 216  * inode_go_lock - operation done after an inode lock is locked by a process
 217  * @gl: the glock
 218  * @flags:
 219  *
 220  * Returns: errno
 221  */
 222
 223 static int inode_go_lock(struct gfs2_holder *gh)
 224 {
 225         struct gfs2_glock *gl = gh->gh_gl;
 226         struct gfs2_sbd *sdp = gl->gl_sbd;
 227         struct gfs2_inode *ip = gl->gl_object;
 228         int error = 0;
 229
 230         if (!ip || (gh->gh_flags & GL_SKIP))
 231                 return 0;
 232
 233         if (test_bit(GIF_INVALID, &ip->i_flags)) {
 234                 error = gfs2_inode_refresh(ip);
 235                 if (error)
 236                         return error;
 237         }
 238
 239         if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
 240             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 241             (gh->gh_state == LM_ST_EXCLUSIVE)) {
 242                 spin_lock(&sdp->sd_trunc_lock);
 243                 if (list_empty(&ip->i_trunc_list))
 244                         list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
 245                 spin_unlock(&sdp->sd_trunc_lock);
 246                 wake_up(&sdp->sd_quota_wait);
 247                 return 1;
 248         }
 249
 250         return error;
 251 }
 252
 253 /**
 254  * inode_go_dump - print information about an inode
 255  * @seq: The iterator
 256  * @ip: the inode
 257  *
 258  * Returns: 0 on success, -ENOBUFS when we run out of space
 259  */
 260
 261 static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
 262 {
 263         const struct gfs2_inode *ip = gl->gl_object;
 264         if (ip == NULL)
 265                 return 0;
 266         gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu/%llu\n",
 267                   (unsigned long long)ip->i_no_formal_ino,
 268                   (unsigned long long)ip->i_no_addr,
 269                   IF2DT(ip->i_inode.i_mode), ip->i_flags,
 270                   (unsigned int)ip->i_diskflags,
 271                   (unsigned long long)ip->i_inode.i_size,
 272                   (unsigned long long)ip->i_disksize);
 273         return 0;
 274 }
 275
 276 /**
 277  * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
 278  * @gl: the glock
 279  *
 280  * Returns: 1 if it's ok
 281  */
 282
 283 static int rgrp_go_demote_ok(const struct gfs2_glock *gl)
 284 {
 285         return !gl->gl_aspace->i_mapping->nrpages;
 286 }
 287
 288 /**
 289  * rgrp_go_lock - operation done after an rgrp lock is locked by
 290  *    a first holder on this node.
 291  * @gl: the glock
 292  * @flags:
 293  *
 294  * Returns: errno
 295  */
 296
 297 static int rgrp_go_lock(struct gfs2_holder *gh)
 298 {
 299         return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
 300 }
 301
 302 /**
 303  * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
 304  *    a last holder on this node.
 305  * @gl: the glock
 306  * @flags:
 307  *
 308  */
 309
 310 static void rgrp_go_unlock(struct gfs2_holder *gh)
 311 {
 312         gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
 313 }
 314
 315 /**
 316  * trans_go_sync - promote/demote the transaction glock
 317  * @gl: the glock
 318  * @state: the requested state
 319  * @flags:
 320  *
 321  */
 322
 323 static void trans_go_sync(struct gfs2_glock *gl)
 324 {
 325         struct gfs2_sbd *sdp = gl->gl_sbd;
 326
 327         if (gl->gl_state != LM_ST_UNLOCKED &&
 328             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 329                 flush_workqueue(gfs2_delete_workqueue);
 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 &&
 391             ip && test_bit(GIF_USER, &ip->i_flags)) {
 392                 gfs2_glock_hold(gl);
 393                 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
 394                         gfs2_glock_put_nolock(gl);
 395         }
 396 }
 397
 398 const struct gfs2_glock_operations gfs2_meta_glops = {
 399         .go_type = LM_TYPE_META,
 400 };
 401
 402 const struct gfs2_glock_operations gfs2_inode_glops = {
 403         .go_xmote_th = inode_go_sync,
 404         .go_inval = inode_go_inval,
 405         .go_demote_ok = inode_go_demote_ok,
 406         .go_lock = inode_go_lock,
 407         .go_dump = inode_go_dump,
 408         .go_type = LM_TYPE_INODE,
 409         .go_min_hold_time = HZ / 5,
 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_demote_ok = rgrp_go_demote_ok,
 416         .go_lock = rgrp_go_lock,
 417         .go_unlock = rgrp_go_unlock,
 418         .go_dump = gfs2_rgrp_dump,
 419         .go_type = LM_TYPE_RGRP,
 420         .go_min_hold_time = HZ / 5,
 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_NONDISK] = &gfs2_trans_glops,
 456         [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
 457         [LM_TYPE_FLOCK] = &gfs2_flock_glops,
 458         [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
 459         [LM_TYPE_QUOTA] = &gfs2_quota_glops,
 460         [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
 461 };
 462