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 u64 blkno; 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 blkno = bh->b_blocknr; 61 gfs2_assert_withdraw(sdp, !buffer_busy(bh)); 62 63 bd->bd_ail = NULL; 64 list_del(&bd->bd_ail_st_list); 65 list_del(&bd->bd_ail_gl_list); 66 atomic_dec(&gl->gl_ail_count); 67 brelse(bh); 68 gfs2_log_unlock(sdp); 69 70 gfs2_trans_add_revoke(sdp, blkno); 71 72 gfs2_log_lock(sdp); 73 } 74 gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count)); 75 gfs2_log_unlock(sdp); 76 77 gfs2_trans_end(sdp); 78 gfs2_log_flush(sdp, NULL); 79 } 80 81 /** 82 * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock 83 * @gl: the glock 84 * 85 */ 86 87 static void gfs2_pte_inval(struct gfs2_glock *gl) 88 { 89 struct gfs2_inode *ip; 90 struct inode *inode; 91 92 ip = gl->gl_object; 93 inode = &ip->i_inode; 94 if (!ip || !S_ISREG(inode->i_mode)) 95 return; 96 97 if (!test_bit(GIF_PAGED, &ip->i_flags)) 98 return; 99 100 unmap_shared_mapping_range(inode->i_mapping, 0, 0); 101 102 if (test_bit(GIF_SW_PAGED, &ip->i_flags)) 103 set_bit(GLF_DIRTY, &gl->gl_flags); 104 105 clear_bit(GIF_SW_PAGED, &ip->i_flags); 106 } 107 108 /** 109 * meta_go_sync - sync out the metadata for this glock 110 * @gl: the glock 111 * 112 * Called when demoting or unlocking an EX glock. We must flush 113 * to disk all dirty buffers/pages relating to this glock, and must not 114 * not return to caller to demote/unlock the glock until I/O is complete. 115 */ 116 117 static void meta_go_sync(struct gfs2_glock *gl) 118 { 119 if (gl->gl_state != LM_ST_EXCLUSIVE) 120 return; 121 122 if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) { 123 gfs2_log_flush(gl->gl_sbd, gl); 124 gfs2_meta_sync(gl); 125 gfs2_ail_empty_gl(gl); 126 } 127 } 128 129 /** 130 * meta_go_inval - invalidate the metadata for this glock 131 * @gl: the glock 132 * @flags: 133 * 134 */ 135 136 static void meta_go_inval(struct gfs2_glock *gl, int flags) 137 { 138 if (!(flags & DIO_METADATA)) 139 return; 140 141 gfs2_meta_inval(gl); 142 gl->gl_vn++; 143 } 144 145 /** 146 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock 147 * @gl: the glock protecting the inode 148 * 149 */ 150 151 static void inode_go_sync(struct gfs2_glock *gl) 152 { 153 struct gfs2_inode *ip = gl->gl_object; 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 if (ip) 161 filemap_fdatawrite(ip->i_inode.i_mapping); 162 gfs2_meta_sync(gl); 163 if (ip) { 164 struct address_space *mapping = ip->i_inode.i_mapping; 165 int error = filemap_fdatawait(mapping); 166 mapping_set_error(mapping, error); 167 } 168 clear_bit(GLF_DIRTY, &gl->gl_flags); 169 gfs2_ail_empty_gl(gl); 170 } 171 } 172 173 /** 174 * inode_go_xmote_th - promote/demote a glock 175 * @gl: the glock 176 * @state: the requested state 177 * @flags: 178 * 179 */ 180 181 static void inode_go_xmote_th(struct gfs2_glock *gl) 182 { 183 if (gl->gl_state != LM_ST_UNLOCKED) 184 gfs2_pte_inval(gl); 185 if (gl->gl_state == LM_ST_EXCLUSIVE) 186 inode_go_sync(gl); 187 } 188 189 /** 190 * inode_go_xmote_bh - After promoting/demoting a glock 191 * @gl: the glock 192 * 193 */ 194 195 static void inode_go_xmote_bh(struct gfs2_glock *gl) 196 { 197 struct gfs2_holder *gh = gl->gl_req_gh; 198 struct buffer_head *bh; 199 int error; 200 201 if (gl->gl_state != LM_ST_UNLOCKED && 202 (!gh || !(gh->gh_flags & GL_SKIP))) { 203 error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh); 204 if (!error) 205 brelse(bh); 206 } 207 } 208 209 /** 210 * inode_go_drop_th - unlock a glock 211 * @gl: the glock 212 * 213 * Invoked from rq_demote(). 214 * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long) 215 * is being purged from our node's glock cache; we're dropping lock. 216 */ 217 218 static void inode_go_drop_th(struct gfs2_glock *gl) 219 { 220 gfs2_pte_inval(gl); 221 if (gl->gl_state == LM_ST_EXCLUSIVE) 222 inode_go_sync(gl); 223 } 224 225 /** 226 * inode_go_inval - prepare a inode glock to be released 227 * @gl: the glock 228 * @flags: 229 * 230 */ 231 232 static void inode_go_inval(struct gfs2_glock *gl, int flags) 233 { 234 struct gfs2_inode *ip = gl->gl_object; 235 int meta = (flags & DIO_METADATA); 236 237 if (meta) { 238 gfs2_meta_inval(gl); 239 if (ip) 240 set_bit(GIF_INVALID, &ip->i_flags); 241 } 242 243 if (ip && S_ISREG(ip->i_inode.i_mode)) { 244 truncate_inode_pages(ip->i_inode.i_mapping, 0); 245 clear_bit(GIF_PAGED, &ip->i_flags); 246 } 247 } 248 249 /** 250 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock 251 * @gl: the glock 252 * 253 * Returns: 1 if it's ok 254 */ 255 256 static int inode_go_demote_ok(struct gfs2_glock *gl) 257 { 258 struct gfs2_sbd *sdp = gl->gl_sbd; 259 int demote = 0; 260 261 if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages) 262 demote = 1; 263 else if (!sdp->sd_args.ar_localcaching && 264 time_after_eq(jiffies, gl->gl_stamp + 265 gfs2_tune_get(sdp, gt_demote_secs) * HZ)) 266 demote = 1; 267 268 return demote; 269 } 270 271 /** 272 * inode_go_lock - operation done after an inode lock is locked by a process 273 * @gl: the glock 274 * @flags: 275 * 276 * Returns: errno 277 */ 278 279 static int inode_go_lock(struct gfs2_holder *gh) 280 { 281 struct gfs2_glock *gl = gh->gh_gl; 282 struct gfs2_inode *ip = gl->gl_object; 283 int error = 0; 284 285 if (!ip) 286 return 0; 287 288 if (test_bit(GIF_INVALID, &ip->i_flags)) { 289 error = gfs2_inode_refresh(ip); 290 if (error) 291 return error; 292 } 293 294 if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) && 295 (gl->gl_state == LM_ST_EXCLUSIVE) && 296 (gh->gh_state == LM_ST_EXCLUSIVE)) 297 error = gfs2_truncatei_resume(ip); 298 299 return error; 300 } 301 302 /** 303 * inode_go_unlock - operation done before an inode lock is unlocked by a 304 * process 305 * @gl: the glock 306 * @flags: 307 * 308 */ 309 310 static void inode_go_unlock(struct gfs2_holder *gh) 311 { 312 struct gfs2_glock *gl = gh->gh_gl; 313 struct gfs2_inode *ip = gl->gl_object; 314 315 if (ip) 316 gfs2_meta_cache_flush(ip); 317 } 318 319 /** 320 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock 321 * @gl: the glock 322 * 323 * Returns: 1 if it's ok 324 */ 325 326 static int rgrp_go_demote_ok(struct gfs2_glock *gl) 327 { 328 return !gl->gl_aspace->i_mapping->nrpages; 329 } 330 331 /** 332 * rgrp_go_lock - operation done after an rgrp lock is locked by 333 * a first holder on this node. 334 * @gl: the glock 335 * @flags: 336 * 337 * Returns: errno 338 */ 339 340 static int rgrp_go_lock(struct gfs2_holder *gh) 341 { 342 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object); 343 } 344 345 /** 346 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by 347 * a last holder on this node. 348 * @gl: the glock 349 * @flags: 350 * 351 */ 352 353 static void rgrp_go_unlock(struct gfs2_holder *gh) 354 { 355 gfs2_rgrp_bh_put(gh->gh_gl->gl_object); 356 } 357 358 /** 359 * trans_go_xmote_th - promote/demote the transaction glock 360 * @gl: the glock 361 * @state: the requested state 362 * @flags: 363 * 364 */ 365 366 static void trans_go_xmote_th(struct gfs2_glock *gl) 367 { 368 struct gfs2_sbd *sdp = gl->gl_sbd; 369 370 if (gl->gl_state != LM_ST_UNLOCKED && 371 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 372 gfs2_meta_syncfs(sdp); 373 gfs2_log_shutdown(sdp); 374 } 375 } 376 377 /** 378 * trans_go_xmote_bh - After promoting/demoting the transaction glock 379 * @gl: the glock 380 * 381 */ 382 383 static void trans_go_xmote_bh(struct gfs2_glock *gl) 384 { 385 struct gfs2_sbd *sdp = gl->gl_sbd; 386 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); 387 struct gfs2_glock *j_gl = ip->i_gl; 388 struct gfs2_log_header_host head; 389 int error; 390 391 if (gl->gl_state != LM_ST_UNLOCKED && 392 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 393 gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode)); 394 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); 395 396 error = gfs2_find_jhead(sdp->sd_jdesc, &head); 397 if (error) 398 gfs2_consist(sdp); 399 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) 400 gfs2_consist(sdp); 401 402 /* Initialize some head of the log stuff */ 403 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) { 404 sdp->sd_log_sequence = head.lh_sequence + 1; 405 gfs2_log_pointers_init(sdp, head.lh_blkno); 406 } 407 } 408 } 409 410 /** 411 * trans_go_drop_th - unlock the transaction glock 412 * @gl: the glock 413 * 414 * We want to sync the device even with localcaching. Remember 415 * that localcaching journal replay only marks buffers dirty. 416 */ 417 418 static void trans_go_drop_th(struct gfs2_glock *gl) 419 { 420 struct gfs2_sbd *sdp = gl->gl_sbd; 421 422 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 423 gfs2_meta_syncfs(sdp); 424 gfs2_log_shutdown(sdp); 425 } 426 } 427 428 /** 429 * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock 430 * @gl: the glock 431 * 432 * Returns: 1 if it's ok 433 */ 434 435 static int quota_go_demote_ok(struct gfs2_glock *gl) 436 { 437 return !atomic_read(&gl->gl_lvb_count); 438 } 439 440 const struct gfs2_glock_operations gfs2_meta_glops = { 441 .go_xmote_th = meta_go_sync, 442 .go_drop_th = meta_go_sync, 443 .go_type = LM_TYPE_META, 444 }; 445 446 const struct gfs2_glock_operations gfs2_inode_glops = { 447 .go_xmote_th = inode_go_xmote_th, 448 .go_xmote_bh = inode_go_xmote_bh, 449 .go_drop_th = inode_go_drop_th, 450 .go_inval = inode_go_inval, 451 .go_demote_ok = inode_go_demote_ok, 452 .go_lock = inode_go_lock, 453 .go_unlock = inode_go_unlock, 454 .go_type = LM_TYPE_INODE, 455 }; 456 457 const struct gfs2_glock_operations gfs2_rgrp_glops = { 458 .go_xmote_th = meta_go_sync, 459 .go_drop_th = meta_go_sync, 460 .go_inval = meta_go_inval, 461 .go_demote_ok = rgrp_go_demote_ok, 462 .go_lock = rgrp_go_lock, 463 .go_unlock = rgrp_go_unlock, 464 .go_type = LM_TYPE_RGRP, 465 }; 466 467 const struct gfs2_glock_operations gfs2_trans_glops = { 468 .go_xmote_th = trans_go_xmote_th, 469 .go_xmote_bh = trans_go_xmote_bh, 470 .go_drop_th = trans_go_drop_th, 471 .go_type = LM_TYPE_NONDISK, 472 }; 473 474 const struct gfs2_glock_operations gfs2_iopen_glops = { 475 .go_type = LM_TYPE_IOPEN, 476 }; 477 478 const struct gfs2_glock_operations gfs2_flock_glops = { 479 .go_type = LM_TYPE_FLOCK, 480 }; 481 482 const struct gfs2_glock_operations gfs2_nondisk_glops = { 483 .go_type = LM_TYPE_NONDISK, 484 }; 485 486 const struct gfs2_glock_operations gfs2_quota_glops = { 487 .go_demote_ok = quota_go_demote_ok, 488 .go_type = LM_TYPE_QUOTA, 489 }; 490 491 const struct gfs2_glock_operations gfs2_journal_glops = { 492 .go_type = LM_TYPE_JOURNAL, 493 }; 494 495