fs/gfs2/glops.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 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         gl->gl_vn++;
 130 }
 131
 132 /**
 133  * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
 134  * @gl: the glock protecting the inode
 135  *
 136  */
 137
 138 static void inode_go_sync(struct gfs2_glock *gl)
 139 {
 140         struct gfs2_inode *ip = gl->gl_object;
 141         struct address_space *metamapping = gl->gl_aspace->i_mapping;
 142         int error;
 143
 144         if (gl->gl_state != LM_ST_UNLOCKED)
 145                 gfs2_pte_inval(gl);
 146         if (gl->gl_state != LM_ST_EXCLUSIVE)
 147                 return;
 148
 149         if (ip && !S_ISREG(ip->i_inode.i_mode))
 150                 ip = NULL;
 151
 152         if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
 153                 gfs2_log_flush(gl->gl_sbd, gl);
 154                 filemap_fdatawrite(metamapping);
 155                 if (ip) {
 156                         struct address_space *mapping = ip->i_inode.i_mapping;
 157                         filemap_fdatawrite(mapping);
 158                         error = filemap_fdatawait(mapping);
 159                         mapping_set_error(mapping, error);
 160                 }
 161                 error = filemap_fdatawait(metamapping);
 162                 mapping_set_error(metamapping, error);
 163                 clear_bit(GLF_DIRTY, &gl->gl_flags);
 164                 gfs2_ail_empty_gl(gl);
 165         }
 166 }
 167
 168 /**
 169  * inode_go_xmote_bh - After promoting/demoting a glock
 170  * @gl: the glock
 171  *
 172  */
 173
 174 static void inode_go_xmote_bh(struct gfs2_glock *gl)
 175 {
 176         struct gfs2_holder *gh = gl->gl_req_gh;
 177         struct buffer_head *bh;
 178         int error;
 179
 180         if (gl->gl_state != LM_ST_UNLOCKED &&
 181             (!gh || !(gh->gh_flags & GL_SKIP))) {
 182                 error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);
 183                 if (!error)
 184                         brelse(bh);
 185         }
 186 }
 187
 188 /**
 189  * inode_go_inval - prepare a inode glock to be released
 190  * @gl: the glock
 191  * @flags:
 192  *
 193  */
 194
 195 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 196 {
 197         struct gfs2_inode *ip = gl->gl_object;
 198         int meta = (flags & DIO_METADATA);
 199
 200         if (meta) {
 201                 gfs2_meta_inval(gl);
 202                 if (ip)
 203                         set_bit(GIF_INVALID, &ip->i_flags);
 204         }
 205
 206         if (ip && S_ISREG(ip->i_inode.i_mode))
 207                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
 208 }
 209
 210 /**
 211  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 212  * @gl: the glock
 213  *
 214  * Returns: 1 if it's ok
 215  */
 216
 217 static int inode_go_demote_ok(struct gfs2_glock *gl)
 218 {
 219         struct gfs2_sbd *sdp = gl->gl_sbd;
 220         int demote = 0;
 221
 222         if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
 223                 demote = 1;
 224         else if (!sdp->sd_args.ar_localcaching &&
 225                  time_after_eq(jiffies, gl->gl_stamp +
 226                                gfs2_tune_get(sdp, gt_demote_secs) * HZ))
 227                 demote = 1;
 228
 229         return demote;
 230 }
 231
 232 /**
 233  * inode_go_lock - operation done after an inode lock is locked by a process
 234  * @gl: the glock
 235  * @flags:
 236  *
 237  * Returns: errno
 238  */
 239
 240 static int inode_go_lock(struct gfs2_holder *gh)
 241 {
 242         struct gfs2_glock *gl = gh->gh_gl;
 243         struct gfs2_inode *ip = gl->gl_object;
 244         int error = 0;
 245
 246         if (!ip)
 247                 return 0;
 248
 249         if (test_bit(GIF_INVALID, &ip->i_flags)) {
 250                 error = gfs2_inode_refresh(ip);
 251                 if (error)
 252                         return error;
 253         }
 254
 255         if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
 256             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 257             (gh->gh_state == LM_ST_EXCLUSIVE))
 258                 error = gfs2_truncatei_resume(ip);
 259
 260         return error;
 261 }
 262
 263 /**
 264  * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
 265  * @gl: the glock
 266  *
 267  * Returns: 1 if it's ok
 268  */
 269
 270 static int rgrp_go_demote_ok(struct gfs2_glock *gl)
 271 {
 272         return !gl->gl_aspace->i_mapping->nrpages;
 273 }
 274
 275 /**
 276  * rgrp_go_lock - operation done after an rgrp lock is locked by
 277  *    a first holder on this node.
 278  * @gl: the glock
 279  * @flags:
 280  *
 281  * Returns: errno
 282  */
 283
 284 static int rgrp_go_lock(struct gfs2_holder *gh)
 285 {
 286         return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
 287 }
 288
 289 /**
 290  * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
 291  *    a last holder on this node.
 292  * @gl: the glock
 293  * @flags:
 294  *
 295  */
 296
 297 static void rgrp_go_unlock(struct gfs2_holder *gh)
 298 {
 299         gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
 300 }
 301
 302 /**
 303  * trans_go_sync - promote/demote the transaction glock
 304  * @gl: the glock
 305  * @state: the requested state
 306  * @flags:
 307  *
 308  */
 309
 310 static void trans_go_sync(struct gfs2_glock *gl)
 311 {
 312         struct gfs2_sbd *sdp = gl->gl_sbd;
 313
 314         if (gl->gl_state != LM_ST_UNLOCKED &&
 315             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 316                 gfs2_meta_syncfs(sdp);
 317                 gfs2_log_shutdown(sdp);
 318         }
 319 }
 320
 321 /**
 322  * trans_go_xmote_bh - After promoting/demoting the transaction glock
 323  * @gl: the glock
 324  *
 325  */
 326
 327 static void trans_go_xmote_bh(struct gfs2_glock *gl)
 328 {
 329         struct gfs2_sbd *sdp = gl->gl_sbd;
 330         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 331         struct gfs2_glock *j_gl = ip->i_gl;
 332         struct gfs2_log_header_host head;
 333         int error;
 334
 335         if (gl->gl_state != LM_ST_UNLOCKED &&
 336             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 337                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 338
 339                 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 340                 if (error)
 341                         gfs2_consist(sdp);
 342                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
 343                         gfs2_consist(sdp);
 344
 345                 /*  Initialize some head of the log stuff  */
 346                 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
 347                         sdp->sd_log_sequence = head.lh_sequence + 1;
 348                         gfs2_log_pointers_init(sdp, head.lh_blkno);
 349                 }
 350         }
 351 }
 352
 353 /**
 354  * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
 355  * @gl: the glock
 356  *
 357  * Returns: 1 if it's ok
 358  */
 359
 360 static int quota_go_demote_ok(struct gfs2_glock *gl)
 361 {
 362         return !atomic_read(&gl->gl_lvb_count);
 363 }
 364
 365 const struct gfs2_glock_operations gfs2_meta_glops = {
 366         .go_xmote_th = meta_go_sync,
 367         .go_type = LM_TYPE_META,
 368 };
 369
 370 const struct gfs2_glock_operations gfs2_inode_glops = {
 371         .go_xmote_th = inode_go_sync,
 372         .go_xmote_bh = inode_go_xmote_bh,
 373         .go_inval = inode_go_inval,
 374         .go_demote_ok = inode_go_demote_ok,
 375         .go_lock = inode_go_lock,
 376         .go_type = LM_TYPE_INODE,
 377         .go_min_hold_time = HZ / 10,
 378 };
 379
 380 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 381         .go_xmote_th = meta_go_sync,
 382         .go_inval = meta_go_inval,
 383         .go_demote_ok = rgrp_go_demote_ok,
 384         .go_lock = rgrp_go_lock,
 385         .go_unlock = rgrp_go_unlock,
 386         .go_type = LM_TYPE_RGRP,
 387         .go_min_hold_time = HZ / 10,
 388 };
 389
 390 const struct gfs2_glock_operations gfs2_trans_glops = {
 391         .go_xmote_th = trans_go_sync,
 392         .go_xmote_bh = trans_go_xmote_bh,
 393         .go_type = LM_TYPE_NONDISK,
 394 };
 395
 396 const struct gfs2_glock_operations gfs2_iopen_glops = {
 397         .go_type = LM_TYPE_IOPEN,
 398 };
 399
 400 const struct gfs2_glock_operations gfs2_flock_glops = {
 401         .go_type = LM_TYPE_FLOCK,
 402 };
 403
 404 const struct gfs2_glock_operations gfs2_nondisk_glops = {
 405         .go_type = LM_TYPE_NONDISK,
 406 };
 407
 408 const struct gfs2_glock_operations gfs2_quota_glops = {
 409         .go_demote_ok = quota_go_demote_ok,
 410         .go_type = LM_TYPE_QUOTA,
 411 };
 412
 413 const struct gfs2_glock_operations gfs2_journal_glops = {
 414         .go_type = LM_TYPE_JOURNAL,
 415 };
 416