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/lm_interface.h>
  16 #include <linux/bio.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         unsigned int blocks;
  42         struct list_head *head = &gl->gl_ail_list;
  43         struct gfs2_bufdata *bd;
  44         struct buffer_head *bh;
  45         int error;
  46
  47         blocks = atomic_read(&gl->gl_ail_count);
  48         if (!blocks)
  49                 return;
  50
  51         error = gfs2_trans_begin(sdp, 0, blocks);
  52         if (gfs2_assert_withdraw(sdp, !error))
  53                 return;
  54
  55         gfs2_log_lock(sdp);
  56         while (!list_empty(head)) {
  57                 bd = list_entry(head->next, struct gfs2_bufdata,
  58                                 bd_ail_gl_list);
  59                 bh = bd->bd_bh;
  60                 gfs2_remove_from_ail(bd);
  61                 bd->bd_bh = NULL;
  62                 bh->b_private = NULL;
  63                 bd->bd_blkno = bh->b_blocknr;
  64                 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
  65                 gfs2_trans_add_revoke(sdp, bd);
  66         }
  67         gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
  68         gfs2_log_unlock(sdp);
  69
  70         gfs2_trans_end(sdp);
  71         gfs2_log_flush(sdp, NULL);
  72 }
  73
  74 /**
  75  * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
  76  * @gl: the glock
  77  *
  78  */
  79
  80 static void gfs2_pte_inval(struct gfs2_glock *gl)
  81 {
  82         struct gfs2_inode *ip;
  83         struct inode *inode;
  84
  85         ip = gl->gl_object;
  86         inode = &ip->i_inode;
  87         if (!ip || !S_ISREG(inode->i_mode))
  88                 return;
  89
  90         unmap_shared_mapping_range(inode->i_mapping, 0, 0);
  91         if (test_bit(GIF_SW_PAGED, &ip->i_flags))
  92                 set_bit(GLF_DIRTY, &gl->gl_flags);
  93
  94 }
  95
  96 /**
  97  * meta_go_sync - sync out the metadata for this glock
  98  * @gl: the glock
  99  *
 100  * Called when demoting or unlocking an EX glock.  We must flush
 101  * to disk all dirty buffers/pages relating to this glock, and must not
 102  * not return to caller to demote/unlock the glock until I/O is complete.
 103  */
 104
 105 static void meta_go_sync(struct gfs2_glock *gl)
 106 {
 107         if (gl->gl_state != LM_ST_EXCLUSIVE)
 108                 return;
 109
 110         if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
 111                 gfs2_log_flush(gl->gl_sbd, gl);
 112                 gfs2_meta_sync(gl);
 113                 gfs2_ail_empty_gl(gl);
 114         }
 115 }
 116
 117 /**
 118  * meta_go_inval - invalidate the metadata for this glock
 119  * @gl: the glock
 120  * @flags:
 121  *
 122  */
 123
 124 static void meta_go_inval(struct gfs2_glock *gl, int flags)
 125 {
 126         if (!(flags & DIO_METADATA))
 127                 return;
 128
 129         gfs2_meta_inval(gl);
 130         if (gl->gl_object == GFS2_I(gl->gl_sbd->sd_rindex))
 131                 gl->gl_sbd->sd_rindex_uptodate = 0;
 132         else if (gl->gl_ops == &gfs2_rgrp_glops && gl->gl_object) {
 133                 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
 134
 135                 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
 136         }
 137 }
 138
 139 /**
 140  * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
 141  * @gl: the glock protecting the inode
 142  *
 143  */
 144
 145 static void inode_go_sync(struct gfs2_glock *gl)
 146 {
 147         struct gfs2_inode *ip = gl->gl_object;
 148         struct address_space *metamapping = gl->gl_aspace->i_mapping;
 149         int error;
 150
 151         if (gl->gl_state != LM_ST_UNLOCKED)
 152                 gfs2_pte_inval(gl);
 153         if (gl->gl_state != LM_ST_EXCLUSIVE)
 154                 return;
 155
 156         if (ip && !S_ISREG(ip->i_inode.i_mode))
 157                 ip = NULL;
 158
 159         if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
 160                 gfs2_log_flush(gl->gl_sbd, gl);
 161                 filemap_fdatawrite(metamapping);
 162                 if (ip) {
 163                         struct address_space *mapping = ip->i_inode.i_mapping;
 164                         filemap_fdatawrite(mapping);
 165                         error = filemap_fdatawait(mapping);
 166                         mapping_set_error(mapping, error);
 167                 }
 168                 error = filemap_fdatawait(metamapping);
 169                 mapping_set_error(metamapping, error);
 170                 clear_bit(GLF_DIRTY, &gl->gl_flags);
 171                 gfs2_ail_empty_gl(gl);
 172         }
 173 }
 174
 175 /**
 176  * inode_go_inval - prepare a inode glock to be released
 177  * @gl: the glock
 178  * @flags:
 179  *
 180  */
 181
 182 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 183 {
 184         struct gfs2_inode *ip = gl->gl_object;
 185         int meta = (flags & DIO_METADATA);
 186
 187         if (meta) {
 188                 gfs2_meta_inval(gl);
 189                 if (ip)
 190                         set_bit(GIF_INVALID, &ip->i_flags);
 191         }
 192
 193         if (ip && S_ISREG(ip->i_inode.i_mode))
 194                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
 195 }
 196
 197 /**
 198  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 199  * @gl: the glock
 200  *
 201  * Returns: 1 if it's ok
 202  */
 203
 204 static int inode_go_demote_ok(struct gfs2_glock *gl)
 205 {
 206         struct gfs2_sbd *sdp = gl->gl_sbd;
 207         int demote = 0;
 208
 209         if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
 210                 demote = 1;
 211         else if (!sdp->sd_args.ar_localcaching &&
 212                  time_after_eq(jiffies, gl->gl_stamp +
 213                                gfs2_tune_get(sdp, gt_demote_secs) * HZ))
 214                 demote = 1;
 215
 216         return demote;
 217 }
 218
 219 /**
 220  * inode_go_lock - operation done after an inode lock is locked by a process
 221  * @gl: the glock
 222  * @flags:
 223  *
 224  * Returns: errno
 225  */
 226
 227 static int inode_go_lock(struct gfs2_holder *gh)
 228 {
 229         struct gfs2_glock *gl = gh->gh_gl;
 230         struct gfs2_inode *ip = gl->gl_object;
 231         int error = 0;
 232
 233         if (!ip || (gh->gh_flags & GL_SKIP))
 234                 return 0;
 235
 236         if (test_bit(GIF_INVALID, &ip->i_flags)) {
 237                 error = gfs2_inode_refresh(ip);
 238                 if (error)
 239                         return error;
 240         }
 241
 242         if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
 243             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 244             (gh->gh_state == LM_ST_EXCLUSIVE))
 245                 error = gfs2_truncatei_resume(ip);
 246
 247         return error;
 248 }
 249
 250 /**
 251  * inode_go_dump - print information about an inode
 252  * @seq: The iterator
 253  * @ip: the inode
 254  *
 255  * Returns: 0 on success, -ENOBUFS when we run out of space
 256  */
 257
 258 static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
 259 {
 260         const struct gfs2_inode *ip = gl->gl_object;
 261         if (ip == NULL)
 262                 return 0;
 263         gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%08lx\n",
 264                   (unsigned long long)ip->i_no_formal_ino,
 265                   (unsigned long long)ip->i_no_addr,
 266                   IF2DT(ip->i_inode.i_mode), ip->i_flags);
 267         return 0;
 268 }
 269
 270 /**
 271  * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
 272  * @gl: the glock
 273  *
 274  * Returns: 1 if it's ok
 275  */
 276
 277 static int rgrp_go_demote_ok(struct gfs2_glock *gl)
 278 {
 279         return !gl->gl_aspace->i_mapping->nrpages;
 280 }
 281
 282 /**
 283  * rgrp_go_lock - operation done after an rgrp lock is locked by
 284  *    a first holder on this node.
 285  * @gl: the glock
 286  * @flags:
 287  *
 288  * Returns: errno
 289  */
 290
 291 static int rgrp_go_lock(struct gfs2_holder *gh)
 292 {
 293         return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
 294 }
 295
 296 /**
 297  * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
 298  *    a last holder on this node.
 299  * @gl: the glock
 300  * @flags:
 301  *
 302  */
 303
 304 static void rgrp_go_unlock(struct gfs2_holder *gh)
 305 {
 306         gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
 307 }
 308
 309 /**
 310  * rgrp_go_dump - print out an rgrp
 311  * @seq: The iterator
 312  * @gl: The glock in question
 313  *
 314  */
 315
 316 static int rgrp_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
 317 {
 318         const struct gfs2_rgrpd *rgd = gl->gl_object;
 319         if (rgd == NULL)
 320                 return 0;
 321         gfs2_print_dbg(seq, " R: n:%llu\n", (unsigned long long)rgd->rd_addr);
 322         return 0;
 323 }
 324
 325 /**
 326  * trans_go_sync - promote/demote the transaction glock
 327  * @gl: the glock
 328  * @state: the requested state
 329  * @flags:
 330  *
 331  */
 332
 333 static void trans_go_sync(struct gfs2_glock *gl)
 334 {
 335         struct gfs2_sbd *sdp = gl->gl_sbd;
 336
 337         if (gl->gl_state != LM_ST_UNLOCKED &&
 338             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 339                 gfs2_meta_syncfs(sdp);
 340                 gfs2_log_shutdown(sdp);
 341         }
 342 }
 343
 344 /**
 345  * trans_go_xmote_bh - After promoting/demoting the transaction glock
 346  * @gl: the glock
 347  *
 348  */
 349
 350 static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
 351 {
 352         struct gfs2_sbd *sdp = gl->gl_sbd;
 353         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 354         struct gfs2_glock *j_gl = ip->i_gl;
 355         struct gfs2_log_header_host head;
 356         int error;
 357
 358         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 359                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 360
 361                 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 362                 if (error)
 363                         gfs2_consist(sdp);
 364                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
 365                         gfs2_consist(sdp);
 366
 367                 /*  Initialize some head of the log stuff  */
 368                 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
 369                         sdp->sd_log_sequence = head.lh_sequence + 1;
 370                         gfs2_log_pointers_init(sdp, head.lh_blkno);
 371                 }
 372         }
 373         return 0;
 374 }
 375
 376 /**
 377  * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
 378  * @gl: the glock
 379  *
 380  * Returns: 1 if it's ok
 381  */
 382
 383 static int quota_go_demote_ok(struct gfs2_glock *gl)
 384 {
 385         return !atomic_read(&gl->gl_lvb_count);
 386 }
 387
 388 const struct gfs2_glock_operations gfs2_meta_glops = {
 389         .go_xmote_th = meta_go_sync,
 390         .go_type = LM_TYPE_META,
 391 };
 392
 393 const struct gfs2_glock_operations gfs2_inode_glops = {
 394         .go_xmote_th = inode_go_sync,
 395         .go_inval = inode_go_inval,
 396         .go_demote_ok = inode_go_demote_ok,
 397         .go_lock = inode_go_lock,
 398         .go_dump = inode_go_dump,
 399         .go_type = LM_TYPE_INODE,
 400         .go_min_hold_time = HZ / 5,
 401 };
 402
 403 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 404         .go_xmote_th = meta_go_sync,
 405         .go_inval = meta_go_inval,
 406         .go_demote_ok = rgrp_go_demote_ok,
 407         .go_lock = rgrp_go_lock,
 408         .go_unlock = rgrp_go_unlock,
 409         .go_dump = rgrp_go_dump,
 410         .go_type = LM_TYPE_RGRP,
 411         .go_min_hold_time = HZ / 5,
 412 };
 413
 414 const struct gfs2_glock_operations gfs2_trans_glops = {
 415         .go_xmote_th = trans_go_sync,
 416         .go_xmote_bh = trans_go_xmote_bh,
 417         .go_type = LM_TYPE_NONDISK,
 418 };
 419
 420 const struct gfs2_glock_operations gfs2_iopen_glops = {
 421         .go_type = LM_TYPE_IOPEN,
 422 };
 423
 424 const struct gfs2_glock_operations gfs2_flock_glops = {
 425         .go_type = LM_TYPE_FLOCK,
 426 };
 427
 428 const struct gfs2_glock_operations gfs2_nondisk_glops = {
 429         .go_type = LM_TYPE_NONDISK,
 430 };
 431
 432 const struct gfs2_glock_operations gfs2_quota_glops = {
 433         .go_demote_ok = quota_go_demote_ok,
 434         .go_type = LM_TYPE_QUOTA,
 435 };
 436
 437 const struct gfs2_glock_operations gfs2_journal_glops = {
 438         .go_type = LM_TYPE_JOURNAL,
 439 };
 440