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 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 struct list_head *head = &gl->gl_ail_list; 41 struct gfs2_bufdata *bd; 42 struct buffer_head *bh; 43 struct gfs2_trans tr; 44 45 memset(&tr, 0, sizeof(tr)); 46 tr.tr_revokes = atomic_read(&gl->gl_ail_count); 47 48 if (!tr.tr_revokes) 49 return; 50 51 /* A shortened, inline version of gfs2_trans_begin() */ 52 tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64)); 53 tr.tr_ip = (unsigned long)__builtin_return_address(0); 54 INIT_LIST_HEAD(&tr.tr_list_buf); 55 gfs2_log_reserve(sdp, tr.tr_reserved); 56 BUG_ON(current->journal_info); 57 current->journal_info = &tr; 58 59 gfs2_log_lock(sdp); 60 while (!list_empty(head)) { 61 bd = list_entry(head->next, struct gfs2_bufdata, 62 bd_ail_gl_list); 63 bh = bd->bd_bh; 64 gfs2_remove_from_ail(bd); 65 bd->bd_bh = NULL; 66 bh->b_private = NULL; 67 bd->bd_blkno = bh->b_blocknr; 68 gfs2_assert_withdraw(sdp, !buffer_busy(bh)); 69 gfs2_trans_add_revoke(sdp, bd); 70 } 71 gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count)); 72 gfs2_log_unlock(sdp); 73 74 gfs2_trans_end(sdp); 75 gfs2_log_flush(sdp, NULL); 76 } 77 78 /** 79 * rgrp_go_sync - sync out the metadata for this glock 80 * @gl: the glock 81 * 82 * Called when demoting or unlocking an EX glock. We must flush 83 * to disk all dirty buffers/pages relating to this glock, and must not 84 * not return to caller to demote/unlock the glock until I/O is complete. 85 */ 86 87 static void rgrp_go_sync(struct gfs2_glock *gl) 88 { 89 struct address_space *metamapping = gfs2_glock2aspace(gl); 90 int error; 91 92 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) 93 return; 94 BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE); 95 96 gfs2_log_flush(gl->gl_sbd, gl); 97 filemap_fdatawrite(metamapping); 98 error = filemap_fdatawait(metamapping); 99 mapping_set_error(metamapping, error); 100 gfs2_ail_empty_gl(gl); 101 } 102 103 /** 104 * rgrp_go_inval - invalidate the metadata for this glock 105 * @gl: the glock 106 * @flags: 107 * 108 * We never used LM_ST_DEFERRED with resource groups, so that we 109 * should always see the metadata flag set here. 110 * 111 */ 112 113 static void rgrp_go_inval(struct gfs2_glock *gl, int flags) 114 { 115 struct address_space *mapping = gfs2_glock2aspace(gl); 116 117 BUG_ON(!(flags & DIO_METADATA)); 118 gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count)); 119 truncate_inode_pages(mapping, 0); 120 121 if (gl->gl_object) { 122 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object; 123 rgd->rd_flags &= ~GFS2_RDF_UPTODATE; 124 } 125 } 126 127 /** 128 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock 129 * @gl: the glock protecting the inode 130 * 131 */ 132 133 static void inode_go_sync(struct gfs2_glock *gl) 134 { 135 struct gfs2_inode *ip = gl->gl_object; 136 struct address_space *metamapping = gfs2_glock2aspace(gl); 137 int error; 138 139 if (ip && !S_ISREG(ip->i_inode.i_mode)) 140 ip = NULL; 141 if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags)) 142 unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0); 143 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) 144 return; 145 146 BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE); 147 148 gfs2_log_flush(gl->gl_sbd, gl); 149 filemap_fdatawrite(metamapping); 150 if (ip) { 151 struct address_space *mapping = ip->i_inode.i_mapping; 152 filemap_fdatawrite(mapping); 153 error = filemap_fdatawait(mapping); 154 mapping_set_error(mapping, error); 155 } 156 error = filemap_fdatawait(metamapping); 157 mapping_set_error(metamapping, error); 158 gfs2_ail_empty_gl(gl); 159 /* 160 * Writeback of the data mapping may cause the dirty flag to be set 161 * so we have to clear it again here. 162 */ 163 smp_mb__before_clear_bit(); 164 clear_bit(GLF_DIRTY, &gl->gl_flags); 165 } 166 167 /** 168 * inode_go_inval - prepare a inode glock to be released 169 * @gl: the glock 170 * @flags: 171 * 172 * Normally we invlidate everything, but if we are moving into 173 * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we 174 * can keep hold of the metadata, since it won't have changed. 175 * 176 */ 177 178 static void inode_go_inval(struct gfs2_glock *gl, int flags) 179 { 180 struct gfs2_inode *ip = gl->gl_object; 181 182 gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count)); 183 184 if (flags & DIO_METADATA) { 185 struct address_space *mapping = gfs2_glock2aspace(gl); 186 truncate_inode_pages(mapping, 0); 187 if (ip) { 188 set_bit(GIF_INVALID, &ip->i_flags); 189 forget_all_cached_acls(&ip->i_inode); 190 } 191 } 192 193 if (ip == GFS2_I(gl->gl_sbd->sd_rindex)) 194 gl->gl_sbd->sd_rindex_uptodate = 0; 195 if (ip && S_ISREG(ip->i_inode.i_mode)) 196 truncate_inode_pages(ip->i_inode.i_mapping, 0); 197 } 198 199 /** 200 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock 201 * @gl: the glock 202 * 203 * Returns: 1 if it's ok 204 */ 205 206 static int inode_go_demote_ok(const struct gfs2_glock *gl) 207 { 208 struct gfs2_sbd *sdp = gl->gl_sbd; 209 if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object) 210 return 0; 211 return 1; 212 } 213 214 /** 215 * inode_go_lock - operation done after an inode lock is locked by a process 216 * @gl: the glock 217 * @flags: 218 * 219 * Returns: errno 220 */ 221 222 static int inode_go_lock(struct gfs2_holder *gh) 223 { 224 struct gfs2_glock *gl = gh->gh_gl; 225 struct gfs2_sbd *sdp = gl->gl_sbd; 226 struct gfs2_inode *ip = gl->gl_object; 227 int error = 0; 228 229 if (!ip || (gh->gh_flags & GL_SKIP)) 230 return 0; 231 232 if (test_bit(GIF_INVALID, &ip->i_flags)) { 233 error = gfs2_inode_refresh(ip); 234 if (error) 235 return error; 236 } 237 238 if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) && 239 (gl->gl_state == LM_ST_EXCLUSIVE) && 240 (gh->gh_state == LM_ST_EXCLUSIVE)) { 241 spin_lock(&sdp->sd_trunc_lock); 242 if (list_empty(&ip->i_trunc_list)) 243 list_add(&sdp->sd_trunc_list, &ip->i_trunc_list); 244 spin_unlock(&sdp->sd_trunc_lock); 245 wake_up(&sdp->sd_quota_wait); 246 return 1; 247 } 248 249 return error; 250 } 251 252 /** 253 * inode_go_dump - print information about an inode 254 * @seq: The iterator 255 * @ip: the inode 256 * 257 * Returns: 0 on success, -ENOBUFS when we run out of space 258 */ 259 260 static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl) 261 { 262 const struct gfs2_inode *ip = gl->gl_object; 263 if (ip == NULL) 264 return 0; 265 gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu\n", 266 (unsigned long long)ip->i_no_formal_ino, 267 (unsigned long long)ip->i_no_addr, 268 IF2DT(ip->i_inode.i_mode), ip->i_flags, 269 (unsigned int)ip->i_diskflags, 270 (unsigned long long)i_size_read(&ip->i_inode)); 271 return 0; 272 } 273 274 /** 275 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock 276 * @gl: the glock 277 * 278 * Returns: 1 if it's ok 279 */ 280 281 static int rgrp_go_demote_ok(const struct gfs2_glock *gl) 282 { 283 const struct address_space *mapping = (const struct address_space *)(gl + 1); 284 return !mapping->nrpages; 285 } 286 287 /** 288 * rgrp_go_lock - operation done after an rgrp lock is locked by 289 * a first holder on this node. 290 * @gl: the glock 291 * @flags: 292 * 293 * Returns: errno 294 */ 295 296 static int rgrp_go_lock(struct gfs2_holder *gh) 297 { 298 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object); 299 } 300 301 /** 302 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by 303 * a last holder on this node. 304 * @gl: the glock 305 * @flags: 306 * 307 */ 308 309 static void rgrp_go_unlock(struct gfs2_holder *gh) 310 { 311 gfs2_rgrp_bh_put(gh->gh_gl->gl_object); 312 } 313 314 /** 315 * trans_go_sync - promote/demote the transaction glock 316 * @gl: the glock 317 * @state: the requested state 318 * @flags: 319 * 320 */ 321 322 static void trans_go_sync(struct gfs2_glock *gl) 323 { 324 struct gfs2_sbd *sdp = gl->gl_sbd; 325 326 if (gl->gl_state != LM_ST_UNLOCKED && 327 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 328 flush_workqueue(gfs2_delete_workqueue); 329 gfs2_meta_syncfs(sdp); 330 gfs2_log_shutdown(sdp); 331 } 332 } 333 334 /** 335 * trans_go_xmote_bh - After promoting/demoting the transaction glock 336 * @gl: the glock 337 * 338 */ 339 340 static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh) 341 { 342 struct gfs2_sbd *sdp = gl->gl_sbd; 343 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); 344 struct gfs2_glock *j_gl = ip->i_gl; 345 struct gfs2_log_header_host head; 346 int error; 347 348 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 349 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); 350 351 error = gfs2_find_jhead(sdp->sd_jdesc, &head); 352 if (error) 353 gfs2_consist(sdp); 354 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) 355 gfs2_consist(sdp); 356 357 /* Initialize some head of the log stuff */ 358 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) { 359 sdp->sd_log_sequence = head.lh_sequence + 1; 360 gfs2_log_pointers_init(sdp, head.lh_blkno); 361 } 362 } 363 return 0; 364 } 365 366 /** 367 * trans_go_demote_ok 368 * @gl: the glock 369 * 370 * Always returns 0 371 */ 372 373 static int trans_go_demote_ok(const struct gfs2_glock *gl) 374 { 375 return 0; 376 } 377 378 /** 379 * iopen_go_callback - schedule the dcache entry for the inode to be deleted 380 * @gl: the glock 381 * 382 * gl_spin lock is held while calling this 383 */ 384 static void iopen_go_callback(struct gfs2_glock *gl) 385 { 386 struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object; 387 388 if (gl->gl_demote_state == LM_ST_UNLOCKED && 389 gl->gl_state == LM_ST_SHARED && ip) { 390 gfs2_glock_hold(gl); 391 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0) 392 gfs2_glock_put_nolock(gl); 393 } 394 } 395 396 const struct gfs2_glock_operations gfs2_meta_glops = { 397 .go_type = LM_TYPE_META, 398 }; 399 400 const struct gfs2_glock_operations gfs2_inode_glops = { 401 .go_xmote_th = inode_go_sync, 402 .go_inval = inode_go_inval, 403 .go_demote_ok = inode_go_demote_ok, 404 .go_lock = inode_go_lock, 405 .go_dump = inode_go_dump, 406 .go_type = LM_TYPE_INODE, 407 .go_min_hold_time = HZ / 5, 408 .go_flags = GLOF_ASPACE, 409 }; 410 411 const struct gfs2_glock_operations gfs2_rgrp_glops = { 412 .go_xmote_th = rgrp_go_sync, 413 .go_inval = rgrp_go_inval, 414 .go_demote_ok = rgrp_go_demote_ok, 415 .go_lock = rgrp_go_lock, 416 .go_unlock = rgrp_go_unlock, 417 .go_dump = gfs2_rgrp_dump, 418 .go_type = LM_TYPE_RGRP, 419 .go_min_hold_time = HZ / 5, 420 .go_flags = GLOF_ASPACE, 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_IOPEN] = &gfs2_iopen_glops, 456 [LM_TYPE_FLOCK] = &gfs2_flock_glops, 457 [LM_TYPE_NONDISK] = &gfs2_nondisk_glops, 458 [LM_TYPE_QUOTA] = &gfs2_quota_glops, 459 [LM_TYPE_JOURNAL] = &gfs2_journal_glops, 460 }; 461 462