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 #include "dir.h"
  30
  31 /**
  32  * __gfs2_ail_flush - 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_flush(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
  45         spin_lock(&sdp->sd_ail_lock);
  46         while (!list_empty(head)) {
  47                 bd = list_entry(head->next, struct gfs2_bufdata,
  48                                 bd_ail_gl_list);
  49                 bh = bd->bd_bh;
  50                 gfs2_remove_from_ail(bd);
  51                 bd->bd_bh = NULL;
  52                 bh->b_private = NULL;
  53                 spin_unlock(&sdp->sd_ail_lock);
  54
  55                 bd->bd_blkno = bh->b_blocknr;
  56                 gfs2_log_lock(sdp);
  57                 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
  58                 gfs2_trans_add_revoke(sdp, bd);
  59                 gfs2_log_unlock(sdp);
  60
  61                 spin_lock(&sdp->sd_ail_lock);
  62         }
  63         gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
  64         spin_unlock(&sdp->sd_ail_lock);
  65 }
  66
  67
  68 static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
  69 {
  70         struct gfs2_sbd *sdp = gl->gl_sbd;
  71         struct gfs2_trans tr;
  72
  73         memset(&tr, 0, sizeof(tr));
  74         tr.tr_revokes = atomic_read(&gl->gl_ail_count);
  75
  76         if (!tr.tr_revokes)
  77                 return;
  78
  79         /* A shortened, inline version of gfs2_trans_begin() */
  80         tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
  81         tr.tr_ip = (unsigned long)__builtin_return_address(0);
  82         INIT_LIST_HEAD(&tr.tr_list_buf);
  83         gfs2_log_reserve(sdp, tr.tr_reserved);
  84         BUG_ON(current->journal_info);
  85         current->journal_info = &tr;
  86
  87         __gfs2_ail_flush(gl);
  88
  89         gfs2_trans_end(sdp);
  90         gfs2_log_flush(sdp, NULL);
  91 }
  92
  93 void gfs2_ail_flush(struct gfs2_glock *gl)
  94 {
  95         struct gfs2_sbd *sdp = gl->gl_sbd;
  96         unsigned int revokes = atomic_read(&gl->gl_ail_count);
  97         int ret;
  98
  99         if (!revokes)
 100                 return;
 101
 102         ret = gfs2_trans_begin(sdp, 0, revokes);
 103         if (ret)
 104                 return;
 105         __gfs2_ail_flush(gl);
 106         gfs2_trans_end(sdp);
 107         gfs2_log_flush(sdp, NULL);
 108 }
 109
 110 /**
 111  * rgrp_go_sync - sync out the metadata for this glock
 112  * @gl: the glock
 113  *
 114  * Called when demoting or unlocking an EX glock.  We must flush
 115  * to disk all dirty buffers/pages relating to this glock, and must not
 116  * not return to caller to demote/unlock the glock until I/O is complete.
 117  */
 118
 119 static void rgrp_go_sync(struct gfs2_glock *gl)
 120 {
 121         struct address_space *metamapping = gfs2_glock2aspace(gl);
 122         int error;
 123
 124         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
 125                 return;
 126         BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
 127
 128         gfs2_log_flush(gl->gl_sbd, gl);
 129         filemap_fdatawrite(metamapping);
 130         error = filemap_fdatawait(metamapping);
 131         mapping_set_error(metamapping, error);
 132         gfs2_ail_empty_gl(gl);
 133 }
 134
 135 /**
 136  * rgrp_go_inval - invalidate the metadata for this glock
 137  * @gl: the glock
 138  * @flags:
 139  *
 140  * We never used LM_ST_DEFERRED with resource groups, so that we
 141  * should always see the metadata flag set here.
 142  *
 143  */
 144
 145 static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
 146 {
 147         struct address_space *mapping = gfs2_glock2aspace(gl);
 148
 149         BUG_ON(!(flags & DIO_METADATA));
 150         gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
 151         truncate_inode_pages(mapping, 0);
 152
 153         if (gl->gl_object) {
 154                 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
 155                 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
 156         }
 157 }
 158
 159 /**
 160  * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
 161  * @gl: the glock protecting the inode
 162  *
 163  */
 164
 165 static void inode_go_sync(struct gfs2_glock *gl)
 166 {
 167         struct gfs2_inode *ip = gl->gl_object;
 168         struct address_space *metamapping = gfs2_glock2aspace(gl);
 169         int error;
 170
 171         if (ip && !S_ISREG(ip->i_inode.i_mode))
 172                 ip = NULL;
 173         if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
 174                 unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
 175         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
 176                 return;
 177
 178         BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
 179
 180         gfs2_log_flush(gl->gl_sbd, gl);
 181         filemap_fdatawrite(metamapping);
 182         if (ip) {
 183                 struct address_space *mapping = ip->i_inode.i_mapping;
 184                 filemap_fdatawrite(mapping);
 185                 error = filemap_fdatawait(mapping);
 186                 mapping_set_error(mapping, error);
 187         }
 188         error = filemap_fdatawait(metamapping);
 189         mapping_set_error(metamapping, error);
 190         gfs2_ail_empty_gl(gl);
 191         /*
 192          * Writeback of the data mapping may cause the dirty flag to be set
 193          * so we have to clear it again here.
 194          */
 195         smp_mb__before_clear_bit();
 196         clear_bit(GLF_DIRTY, &gl->gl_flags);
 197 }
 198
 199 /**
 200  * inode_go_inval - prepare a inode glock to be released
 201  * @gl: the glock
 202  * @flags:
 203  *
 204  * Normally we invlidate everything, but if we are moving into
 205  * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
 206  * can keep hold of the metadata, since it won't have changed.
 207  *
 208  */
 209
 210 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 211 {
 212         struct gfs2_inode *ip = gl->gl_object;
 213
 214         gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
 215
 216         if (flags & DIO_METADATA) {
 217                 struct address_space *mapping = gfs2_glock2aspace(gl);
 218                 truncate_inode_pages(mapping, 0);
 219                 if (ip) {
 220                         set_bit(GIF_INVALID, &ip->i_flags);
 221                         forget_all_cached_acls(&ip->i_inode);
 222                         gfs2_dir_hash_inval(ip);
 223                 }
 224         }
 225
 226         if (ip == GFS2_I(gl->gl_sbd->sd_rindex)) {
 227                 gfs2_log_flush(gl->gl_sbd, NULL);
 228                 gl->gl_sbd->sd_rindex_uptodate = 0;
 229         }
 230         if (ip && S_ISREG(ip->i_inode.i_mode))
 231                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
 232 }
 233
 234 /**
 235  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 236  * @gl: the glock
 237  *
 238  * Returns: 1 if it's ok
 239  */
 240
 241 static int inode_go_demote_ok(const struct gfs2_glock *gl)
 242 {
 243         struct gfs2_sbd *sdp = gl->gl_sbd;
 244         struct gfs2_holder *gh;
 245
 246         if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
 247                 return 0;
 248
 249         if (!list_empty(&gl->gl_holders)) {
 250                 gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
 251                 if (gh->gh_list.next != &gl->gl_holders)
 252                         return 0;
 253         }
 254
 255         return 1;
 256 }
 257
 258 /**
 259  * gfs2_set_nlink - Set the inode's link count based on on-disk info
 260  * @inode: The inode in question
 261  * @nlink: The link count
 262  *
 263  * If the link count has hit zero, it must never be raised, whatever the
 264  * on-disk inode might say. When new struct inodes are created the link
 265  * count is set to 1, so that we can safely use this test even when reading
 266  * in on disk information for the first time.
 267  */
 268
 269 static void gfs2_set_nlink(struct inode *inode, u32 nlink)
 270 {
 271         /*
 272          * We will need to review setting the nlink count here in the
 273          * light of the forthcoming ro bind mount work. This is a reminder
 274          * to do that.
 275          */
 276         if ((inode->i_nlink != nlink) && (inode->i_nlink != 0)) {
 277                 if (nlink == 0)
 278                         clear_nlink(inode);
 279                 else
 280                         inode->i_nlink = nlink;
 281         }
 282 }
 283
 284 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
 285 {
 286         const struct gfs2_dinode *str = buf;
 287         struct timespec atime;
 288         u16 height, depth;
 289
 290         if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
 291                 goto corrupt;
 292         ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
 293         ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
 294         ip->i_inode.i_rdev = 0;
 295         switch (ip->i_inode.i_mode & S_IFMT) {
 296         case S_IFBLK:
 297         case S_IFCHR:
 298                 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
 299                                            be32_to_cpu(str->di_minor));
 300                 break;
 301         };
 302
 303         ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
 304         ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
 305         gfs2_set_nlink(&ip->i_inode, be32_to_cpu(str->di_nlink));
 306         i_size_write(&ip->i_inode, be64_to_cpu(str->di_size));
 307         gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
 308         atime.tv_sec = be64_to_cpu(str->di_atime);
 309         atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
 310         if (timespec_compare(&ip->i_inode.i_atime, &atime) < 0)
 311                 ip->i_inode.i_atime = atime;
 312         ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
 313         ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
 314         ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
 315         ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
 316
 317         ip->i_goal = be64_to_cpu(str->di_goal_meta);
 318         ip->i_generation = be64_to_cpu(str->di_generation);
 319
 320         ip->i_diskflags = be32_to_cpu(str->di_flags);
 321         ip->i_eattr = be64_to_cpu(str->di_eattr);
 322         /* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */
 323         gfs2_set_inode_flags(&ip->i_inode);
 324         height = be16_to_cpu(str->di_height);
 325         if (unlikely(height > GFS2_MAX_META_HEIGHT))
 326                 goto corrupt;
 327         ip->i_height = (u8)height;
 328
 329         depth = be16_to_cpu(str->di_depth);
 330         if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
 331                 goto corrupt;
 332         ip->i_depth = (u8)depth;
 333         ip->i_entries = be32_to_cpu(str->di_entries);
 334
 335         if (S_ISREG(ip->i_inode.i_mode))
 336                 gfs2_set_aops(&ip->i_inode);
 337
 338         return 0;
 339 corrupt:
 340         gfs2_consist_inode(ip);
 341         return -EIO;
 342 }
 343
 344 /**
 345  * gfs2_inode_refresh - Refresh the incore copy of the dinode
 346  * @ip: The GFS2 inode
 347  *
 348  * Returns: errno
 349  */
 350
 351 int gfs2_inode_refresh(struct gfs2_inode *ip)
 352 {
 353         struct buffer_head *dibh;
 354         int error;
 355
 356         error = gfs2_meta_inode_buffer(ip, &dibh);
 357         if (error)
 358                 return error;
 359
 360         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
 361                 brelse(dibh);
 362                 return -EIO;
 363         }
 364
 365         error = gfs2_dinode_in(ip, dibh->b_data);
 366         brelse(dibh);
 367         clear_bit(GIF_INVALID, &ip->i_flags);
 368
 369         return error;
 370 }
 371
 372 /**
 373  * inode_go_lock - operation done after an inode lock is locked by a process
 374  * @gl: the glock
 375  * @flags:
 376  *
 377  * Returns: errno
 378  */
 379
 380 static int inode_go_lock(struct gfs2_holder *gh)
 381 {
 382         struct gfs2_glock *gl = gh->gh_gl;
 383         struct gfs2_sbd *sdp = gl->gl_sbd;
 384         struct gfs2_inode *ip = gl->gl_object;
 385         int error = 0;
 386
 387         if (!ip || (gh->gh_flags & GL_SKIP))
 388                 return 0;
 389
 390         if (test_bit(GIF_INVALID, &ip->i_flags)) {
 391                 error = gfs2_inode_refresh(ip);
 392                 if (error)
 393                         return error;
 394         }
 395
 396         if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
 397             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 398             (gh->gh_state == LM_ST_EXCLUSIVE)) {
 399                 spin_lock(&sdp->sd_trunc_lock);
 400                 if (list_empty(&ip->i_trunc_list))
 401                         list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
 402                 spin_unlock(&sdp->sd_trunc_lock);
 403                 wake_up(&sdp->sd_quota_wait);
 404                 return 1;
 405         }
 406
 407         return error;
 408 }
 409
 410 /**
 411  * inode_go_dump - print information about an inode
 412  * @seq: The iterator
 413  * @ip: the inode
 414  *
 415  * Returns: 0 on success, -ENOBUFS when we run out of space
 416  */
 417
 418 static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
 419 {
 420         const struct gfs2_inode *ip = gl->gl_object;
 421         if (ip == NULL)
 422                 return 0;
 423         gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu\n",
 424                   (unsigned long long)ip->i_no_formal_ino,
 425                   (unsigned long long)ip->i_no_addr,
 426                   IF2DT(ip->i_inode.i_mode), ip->i_flags,
 427                   (unsigned int)ip->i_diskflags,
 428                   (unsigned long long)i_size_read(&ip->i_inode));
 429         return 0;
 430 }
 431
 432 /**
 433  * rgrp_go_lock - operation done after an rgrp lock is locked by
 434  *    a first holder on this node.
 435  * @gl: the glock
 436  * @flags:
 437  *
 438  * Returns: errno
 439  */
 440
 441 static int rgrp_go_lock(struct gfs2_holder *gh)
 442 {
 443         return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
 444 }
 445
 446 /**
 447  * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
 448  *    a last holder on this node.
 449  * @gl: the glock
 450  * @flags:
 451  *
 452  */
 453
 454 static void rgrp_go_unlock(struct gfs2_holder *gh)
 455 {
 456         gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
 457 }
 458
 459 /**
 460  * trans_go_sync - promote/demote the transaction glock
 461  * @gl: the glock
 462  * @state: the requested state
 463  * @flags:
 464  *
 465  */
 466
 467 static void trans_go_sync(struct gfs2_glock *gl)
 468 {
 469         struct gfs2_sbd *sdp = gl->gl_sbd;
 470
 471         if (gl->gl_state != LM_ST_UNLOCKED &&
 472             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 473                 gfs2_meta_syncfs(sdp);
 474                 gfs2_log_shutdown(sdp);
 475         }
 476 }
 477
 478 /**
 479  * trans_go_xmote_bh - After promoting/demoting the transaction glock
 480  * @gl: the glock
 481  *
 482  */
 483
 484 static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
 485 {
 486         struct gfs2_sbd *sdp = gl->gl_sbd;
 487         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 488         struct gfs2_glock *j_gl = ip->i_gl;
 489         struct gfs2_log_header_host head;
 490         int error;
 491
 492         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 493                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 494
 495                 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 496                 if (error)
 497                         gfs2_consist(sdp);
 498                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
 499                         gfs2_consist(sdp);
 500
 501                 /*  Initialize some head of the log stuff  */
 502                 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
 503                         sdp->sd_log_sequence = head.lh_sequence + 1;
 504                         gfs2_log_pointers_init(sdp, head.lh_blkno);
 505                 }
 506         }
 507         return 0;
 508 }
 509
 510 /**
 511  * trans_go_demote_ok
 512  * @gl: the glock
 513  *
 514  * Always returns 0
 515  */
 516
 517 static int trans_go_demote_ok(const struct gfs2_glock *gl)
 518 {
 519         return 0;
 520 }
 521
 522 /**
 523  * iopen_go_callback - schedule the dcache entry for the inode to be deleted
 524  * @gl: the glock
 525  *
 526  * gl_spin lock is held while calling this
 527  */
 528 static void iopen_go_callback(struct gfs2_glock *gl)
 529 {
 530         struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;
 531         struct gfs2_sbd *sdp = gl->gl_sbd;
 532
 533         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 534                 return;
 535
 536         if (gl->gl_demote_state == LM_ST_UNLOCKED &&
 537             gl->gl_state == LM_ST_SHARED && ip) {
 538                 gfs2_glock_hold(gl);
 539                 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
 540                         gfs2_glock_put_nolock(gl);
 541         }
 542 }
 543
 544 const struct gfs2_glock_operations gfs2_meta_glops = {
 545         .go_type = LM_TYPE_META,
 546 };
 547
 548 const struct gfs2_glock_operations gfs2_inode_glops = {
 549         .go_xmote_th = inode_go_sync,
 550         .go_inval = inode_go_inval,
 551         .go_demote_ok = inode_go_demote_ok,
 552         .go_lock = inode_go_lock,
 553         .go_dump = inode_go_dump,
 554         .go_type = LM_TYPE_INODE,
 555         .go_flags = GLOF_ASPACE,
 556 };
 557
 558 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 559         .go_xmote_th = rgrp_go_sync,
 560         .go_inval = rgrp_go_inval,
 561         .go_lock = rgrp_go_lock,
 562         .go_unlock = rgrp_go_unlock,
 563         .go_dump = gfs2_rgrp_dump,
 564         .go_type = LM_TYPE_RGRP,
 565         .go_flags = GLOF_ASPACE,
 566 };
 567
 568 const struct gfs2_glock_operations gfs2_trans_glops = {
 569         .go_xmote_th = trans_go_sync,
 570         .go_xmote_bh = trans_go_xmote_bh,
 571         .go_demote_ok = trans_go_demote_ok,
 572         .go_type = LM_TYPE_NONDISK,
 573 };
 574
 575 const struct gfs2_glock_operations gfs2_iopen_glops = {
 576         .go_type = LM_TYPE_IOPEN,
 577         .go_callback = iopen_go_callback,
 578 };
 579
 580 const struct gfs2_glock_operations gfs2_flock_glops = {
 581         .go_type = LM_TYPE_FLOCK,
 582 };
 583
 584 const struct gfs2_glock_operations gfs2_nondisk_glops = {
 585         .go_type = LM_TYPE_NONDISK,
 586 };
 587
 588 const struct gfs2_glock_operations gfs2_quota_glops = {
 589         .go_type = LM_TYPE_QUOTA,
 590 };
 591
 592 const struct gfs2_glock_operations gfs2_journal_glops = {
 593         .go_type = LM_TYPE_JOURNAL,
 594 };
 595
 596 const struct gfs2_glock_operations *gfs2_glops_list[] = {
 597         [LM_TYPE_META] = &gfs2_meta_glops,
 598         [LM_TYPE_INODE] = &gfs2_inode_glops,
 599         [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
 600         [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
 601         [LM_TYPE_FLOCK] = &gfs2_flock_glops,
 602         [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
 603         [LM_TYPE_QUOTA] = &gfs2_quota_glops,
 604         [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
 605 };
 606