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
  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         unsigned int blocks;
  41         struct list_head *head = &gl->gl_ail_list;
  42         struct gfs2_bufdata *bd;
  43         struct buffer_head *bh;
  44         int error;
  45
  46         blocks = atomic_read(&gl->gl_ail_count);
  47         if (!blocks)
  48                 return;
  49
  50         error = gfs2_trans_begin(sdp, 0, blocks);
  51         if (gfs2_assert_withdraw(sdp, !error))
  52                 return;
  53
  54         gfs2_log_lock(sdp);
  55         while (!list_empty(head)) {
  56                 bd = list_entry(head->next, struct gfs2_bufdata,
  57                                 bd_ail_gl_list);
  58                 bh = bd->bd_bh;
  59                 gfs2_remove_from_ail(bd);
  60                 bd->bd_bh = NULL;
  61                 bh->b_private = NULL;
  62                 bd->bd_blkno = bh->b_blocknr;
  63                 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
  64                 gfs2_trans_add_revoke(sdp, bd);
  65         }
  66         gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
  67         gfs2_log_unlock(sdp);
  68
  69         gfs2_trans_end(sdp);
  70         gfs2_log_flush(sdp, NULL);
  71 }
  72
  73 /**
  74  * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
  75  * @gl: the glock
  76  *
  77  */
  78
  79 static void gfs2_pte_inval(struct gfs2_glock *gl)
  80 {
  81         struct gfs2_inode *ip;
  82         struct inode *inode;
  83
  84         ip = gl->gl_object;
  85         inode = &ip->i_inode;
  86         if (!ip || !S_ISREG(inode->i_mode))
  87                 return;
  88
  89         unmap_shared_mapping_range(inode->i_mapping, 0, 0);
  90         if (test_bit(GIF_SW_PAGED, &ip->i_flags))
  91                 set_bit(GLF_DIRTY, &gl->gl_flags);
  92
  93 }
  94
  95 /**
  96  * meta_go_sync - sync out the metadata for this glock
  97  * @gl: the glock
  98  *
  99  * Called when demoting or unlocking an EX glock.  We must flush
 100  * to disk all dirty buffers/pages relating to this glock, and must not
 101  * not return to caller to demote/unlock the glock until I/O is complete.
 102  */
 103
 104 static void meta_go_sync(struct gfs2_glock *gl)
 105 {
 106         if (gl->gl_state != LM_ST_EXCLUSIVE)
 107                 return;
 108
 109         if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
 110                 gfs2_log_flush(gl->gl_sbd, gl);
 111                 gfs2_meta_sync(gl);
 112                 gfs2_ail_empty_gl(gl);
 113         }
 114 }
 115
 116 /**
 117  * meta_go_inval - invalidate the metadata for this glock
 118  * @gl: the glock
 119  * @flags:
 120  *
 121  */
 122
 123 static void meta_go_inval(struct gfs2_glock *gl, int flags)
 124 {
 125         if (!(flags & DIO_METADATA))
 126                 return;
 127
 128         gfs2_meta_inval(gl);
 129         if (gl->gl_object == GFS2_I(gl->gl_sbd->sd_rindex))
 130                 gl->gl_sbd->sd_rindex_uptodate = 0;
 131         else if (gl->gl_ops == &gfs2_rgrp_glops && gl->gl_object) {
 132                 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
 133
 134                 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
 135         }
 136 }
 137
 138 /**
 139  * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
 140  * @gl: the glock protecting the inode
 141  *
 142  */
 143
 144 static void inode_go_sync(struct gfs2_glock *gl)
 145 {
 146         struct gfs2_inode *ip = gl->gl_object;
 147         struct address_space *metamapping = gl->gl_aspace->i_mapping;
 148         int error;
 149
 150         if (gl->gl_state != LM_ST_UNLOCKED)
 151                 gfs2_pte_inval(gl);
 152         if (gl->gl_state != LM_ST_EXCLUSIVE)
 153                 return;
 154
 155         if (ip && !S_ISREG(ip->i_inode.i_mode))
 156                 ip = NULL;
 157
 158         if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
 159                 gfs2_log_flush(gl->gl_sbd, gl);
 160                 filemap_fdatawrite(metamapping);
 161                 if (ip) {
 162                         struct address_space *mapping = ip->i_inode.i_mapping;
 163                         filemap_fdatawrite(mapping);
 164                         error = filemap_fdatawait(mapping);
 165                         mapping_set_error(mapping, error);
 166                 }
 167                 error = filemap_fdatawait(metamapping);
 168                 mapping_set_error(metamapping, error);
 169                 clear_bit(GLF_DIRTY, &gl->gl_flags);
 170                 gfs2_ail_empty_gl(gl);
 171         }
 172 }
 173
 174 /**
 175  * inode_go_xmote_bh - After promoting/demoting a glock
 176  * @gl: the glock
 177  *
 178  */
 179
 180 static void inode_go_xmote_bh(struct gfs2_glock *gl)
 181 {
 182         struct gfs2_holder *gh = gl->gl_req_gh;
 183         struct buffer_head *bh;
 184         int error;
 185
 186         if (gl->gl_state != LM_ST_UNLOCKED &&
 187             (!gh || !(gh->gh_flags & GL_SKIP))) {
 188                 error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);
 189                 if (!error)
 190                         brelse(bh);
 191         }
 192 }
 193
 194 /**
 195  * inode_go_inval - prepare a inode glock to be released
 196  * @gl: the glock
 197  * @flags:
 198  *
 199  */
 200
 201 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 202 {
 203         struct gfs2_inode *ip = gl->gl_object;
 204         int meta = (flags & DIO_METADATA);
 205
 206         if (meta) {
 207                 gfs2_meta_inval(gl);
 208                 if (ip)
 209                         set_bit(GIF_INVALID, &ip->i_flags);
 210         }
 211
 212         if (ip && S_ISREG(ip->i_inode.i_mode))
 213                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
 214 }
 215
 216 /**
 217  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 218  * @gl: the glock
 219  *
 220  * Returns: 1 if it's ok
 221  */
 222
 223 static int inode_go_demote_ok(struct gfs2_glock *gl)
 224 {
 225         struct gfs2_sbd *sdp = gl->gl_sbd;
 226         int demote = 0;
 227
 228         if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
 229                 demote = 1;
 230         else if (!sdp->sd_args.ar_localcaching &&
 231                  time_after_eq(jiffies, gl->gl_stamp +
 232                                gfs2_tune_get(sdp, gt_demote_secs) * HZ))
 233                 demote = 1;
 234
 235         return demote;
 236 }
 237
 238 /**
 239  * inode_go_lock - operation done after an inode lock is locked by a process
 240  * @gl: the glock
 241  * @flags:
 242  *
 243  * Returns: errno
 244  */
 245
 246 static int inode_go_lock(struct gfs2_holder *gh)
 247 {
 248         struct gfs2_glock *gl = gh->gh_gl;
 249         struct gfs2_inode *ip = gl->gl_object;
 250         int error = 0;
 251
 252         if (!ip || (gh->gh_flags & GL_SKIP))
 253                 return 0;
 254
 255         if (test_bit(GIF_INVALID, &ip->i_flags)) {
 256                 error = gfs2_inode_refresh(ip);
 257                 if (error)
 258                         return error;
 259         }
 260
 261         if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
 262             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 263             (gh->gh_state == LM_ST_EXCLUSIVE))
 264                 error = gfs2_truncatei_resume(ip);
 265
 266         return error;
 267 }
 268
 269 /**
 270  * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
 271  * @gl: the glock
 272  *
 273  * Returns: 1 if it's ok
 274  */
 275
 276 static int rgrp_go_demote_ok(struct gfs2_glock *gl)
 277 {
 278         return !gl->gl_aspace->i_mapping->nrpages;
 279 }
 280
 281 /**
 282  * rgrp_go_lock - operation done after an rgrp lock is locked by
 283  *    a first holder on this node.
 284  * @gl: the glock
 285  * @flags:
 286  *
 287  * Returns: errno
 288  */
 289
 290 static int rgrp_go_lock(struct gfs2_holder *gh)
 291 {
 292         return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
 293 }
 294
 295 /**
 296  * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
 297  *    a last holder on this node.
 298  * @gl: the glock
 299  * @flags:
 300  *
 301  */
 302
 303 static void rgrp_go_unlock(struct gfs2_holder *gh)
 304 {
 305         gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
 306 }
 307
 308 /**
 309  * trans_go_sync - promote/demote the transaction glock
 310  * @gl: the glock
 311  * @state: the requested state
 312  * @flags:
 313  *
 314  */
 315
 316 static void trans_go_sync(struct gfs2_glock *gl)
 317 {
 318         struct gfs2_sbd *sdp = gl->gl_sbd;
 319
 320         if (gl->gl_state != LM_ST_UNLOCKED &&
 321             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 322                 gfs2_meta_syncfs(sdp);
 323                 gfs2_log_shutdown(sdp);
 324         }
 325 }
 326
 327 /**
 328  * trans_go_xmote_bh - After promoting/demoting the transaction glock
 329  * @gl: the glock
 330  *
 331  */
 332
 333 static void trans_go_xmote_bh(struct gfs2_glock *gl)
 334 {
 335         struct gfs2_sbd *sdp = gl->gl_sbd;
 336         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 337         struct gfs2_glock *j_gl = ip->i_gl;
 338         struct gfs2_log_header_host head;
 339         int error;
 340
 341         if (gl->gl_state != LM_ST_UNLOCKED &&
 342             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 343                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 344
 345                 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 346                 if (error)
 347                         gfs2_consist(sdp);
 348                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
 349                         gfs2_consist(sdp);
 350
 351                 /*  Initialize some head of the log stuff  */
 352                 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
 353                         sdp->sd_log_sequence = head.lh_sequence + 1;
 354                         gfs2_log_pointers_init(sdp, head.lh_blkno);
 355                 }
 356         }
 357 }
 358
 359 /**
 360  * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
 361  * @gl: the glock
 362  *
 363  * Returns: 1 if it's ok
 364  */
 365
 366 static int quota_go_demote_ok(struct gfs2_glock *gl)
 367 {
 368         return !atomic_read(&gl->gl_lvb_count);
 369 }
 370
 371 const struct gfs2_glock_operations gfs2_meta_glops = {
 372         .go_xmote_th = meta_go_sync,
 373         .go_type = LM_TYPE_META,
 374 };
 375
 376 const struct gfs2_glock_operations gfs2_inode_glops = {
 377         .go_xmote_th = inode_go_sync,
 378         .go_xmote_bh = inode_go_xmote_bh,
 379         .go_inval = inode_go_inval,
 380         .go_demote_ok = inode_go_demote_ok,
 381         .go_lock = inode_go_lock,
 382         .go_type = LM_TYPE_INODE,
 383         .go_min_hold_time = HZ / 10,
 384 };
 385
 386 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 387         .go_xmote_th = meta_go_sync,
 388         .go_inval = meta_go_inval,
 389         .go_demote_ok = rgrp_go_demote_ok,
 390         .go_lock = rgrp_go_lock,
 391         .go_unlock = rgrp_go_unlock,
 392         .go_type = LM_TYPE_RGRP,
 393         .go_min_hold_time = HZ / 10,
 394 };
 395
 396 const struct gfs2_glock_operations gfs2_trans_glops = {
 397         .go_xmote_th = trans_go_sync,
 398         .go_xmote_bh = trans_go_xmote_bh,
 399         .go_type = LM_TYPE_NONDISK,
 400 };
 401
 402 const struct gfs2_glock_operations gfs2_iopen_glops = {
 403         .go_type = LM_TYPE_IOPEN,
 404 };
 405
 406 const struct gfs2_glock_operations gfs2_flock_glops = {
 407         .go_type = LM_TYPE_FLOCK,
 408 };
 409
 410 const struct gfs2_glock_operations gfs2_nondisk_glops = {
 411         .go_type = LM_TYPE_NONDISK,
 412 };
 413
 414 const struct gfs2_glock_operations gfs2_quota_glops = {
 415         .go_demote_ok = quota_go_demote_ok,
 416         .go_type = LM_TYPE_QUOTA,
 417 };
 418
 419 const struct gfs2_glock_operations gfs2_journal_glops = {
 420         .go_type = LM_TYPE_JOURNAL,
 421 };
 422