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 if (error == -ENOSPC) 167 set_bit(AS_ENOSPC, &mapping->flags); 168 else if (error) 169 set_bit(AS_EIO, &mapping->flags); 170 } 171 clear_bit(GLF_DIRTY, &gl->gl_flags); 172 gfs2_ail_empty_gl(gl); 173 } 174 } 175 176 /** 177 * inode_go_xmote_th - promote/demote a glock 178 * @gl: the glock 179 * @state: the requested state 180 * @flags: 181 * 182 */ 183 184 static void inode_go_xmote_th(struct gfs2_glock *gl) 185 { 186 if (gl->gl_state != LM_ST_UNLOCKED) 187 gfs2_pte_inval(gl); 188 if (gl->gl_state == LM_ST_EXCLUSIVE) 189 inode_go_sync(gl); 190 } 191 192 /** 193 * inode_go_xmote_bh - After promoting/demoting a glock 194 * @gl: the glock 195 * 196 */ 197 198 static void inode_go_xmote_bh(struct gfs2_glock *gl) 199 { 200 struct gfs2_holder *gh = gl->gl_req_gh; 201 struct buffer_head *bh; 202 int error; 203 204 if (gl->gl_state != LM_ST_UNLOCKED && 205 (!gh || !(gh->gh_flags & GL_SKIP))) { 206 error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh); 207 if (!error) 208 brelse(bh); 209 } 210 } 211 212 /** 213 * inode_go_drop_th - unlock a glock 214 * @gl: the glock 215 * 216 * Invoked from rq_demote(). 217 * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long) 218 * is being purged from our node's glock cache; we're dropping lock. 219 */ 220 221 static void inode_go_drop_th(struct gfs2_glock *gl) 222 { 223 gfs2_pte_inval(gl); 224 if (gl->gl_state == LM_ST_EXCLUSIVE) 225 inode_go_sync(gl); 226 } 227 228 /** 229 * inode_go_inval - prepare a inode glock to be released 230 * @gl: the glock 231 * @flags: 232 * 233 */ 234 235 static void inode_go_inval(struct gfs2_glock *gl, int flags) 236 { 237 struct gfs2_inode *ip = gl->gl_object; 238 int meta = (flags & DIO_METADATA); 239 240 if (meta) { 241 gfs2_meta_inval(gl); 242 if (ip) 243 set_bit(GIF_INVALID, &ip->i_flags); 244 } 245 246 if (ip && S_ISREG(ip->i_inode.i_mode)) { 247 truncate_inode_pages(ip->i_inode.i_mapping, 0); 248 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), !ip->i_inode.i_mapping->nrpages); 249 clear_bit(GIF_PAGED, &ip->i_flags); 250 } 251 } 252 253 /** 254 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock 255 * @gl: the glock 256 * 257 * Returns: 1 if it's ok 258 */ 259 260 static int inode_go_demote_ok(struct gfs2_glock *gl) 261 { 262 struct gfs2_sbd *sdp = gl->gl_sbd; 263 int demote = 0; 264 265 if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages) 266 demote = 1; 267 else if (!sdp->sd_args.ar_localcaching && 268 time_after_eq(jiffies, gl->gl_stamp + 269 gfs2_tune_get(sdp, gt_demote_secs) * HZ)) 270 demote = 1; 271 272 return demote; 273 } 274 275 /** 276 * inode_go_lock - operation done after an inode lock is locked by a process 277 * @gl: the glock 278 * @flags: 279 * 280 * Returns: errno 281 */ 282 283 static int inode_go_lock(struct gfs2_holder *gh) 284 { 285 struct gfs2_glock *gl = gh->gh_gl; 286 struct gfs2_inode *ip = gl->gl_object; 287 int error = 0; 288 289 if (!ip) 290 return 0; 291 292 if (test_bit(GIF_INVALID, &ip->i_flags)) { 293 error = gfs2_inode_refresh(ip); 294 if (error) 295 return error; 296 } 297 298 if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) && 299 (gl->gl_state == LM_ST_EXCLUSIVE) && 300 (gh->gh_state == LM_ST_EXCLUSIVE)) 301 error = gfs2_truncatei_resume(ip); 302 303 return error; 304 } 305 306 /** 307 * inode_go_unlock - operation done before an inode lock is unlocked by a 308 * process 309 * @gl: the glock 310 * @flags: 311 * 312 */ 313 314 static void inode_go_unlock(struct gfs2_holder *gh) 315 { 316 struct gfs2_glock *gl = gh->gh_gl; 317 struct gfs2_inode *ip = gl->gl_object; 318 319 if (ip) 320 gfs2_meta_cache_flush(ip); 321 } 322 323 /** 324 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock 325 * @gl: the glock 326 * 327 * Returns: 1 if it's ok 328 */ 329 330 static int rgrp_go_demote_ok(struct gfs2_glock *gl) 331 { 332 return !gl->gl_aspace->i_mapping->nrpages; 333 } 334 335 /** 336 * rgrp_go_lock - operation done after an rgrp lock is locked by 337 * a first holder on this node. 338 * @gl: the glock 339 * @flags: 340 * 341 * Returns: errno 342 */ 343 344 static int rgrp_go_lock(struct gfs2_holder *gh) 345 { 346 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object); 347 } 348 349 /** 350 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by 351 * a last holder on this node. 352 * @gl: the glock 353 * @flags: 354 * 355 */ 356 357 static void rgrp_go_unlock(struct gfs2_holder *gh) 358 { 359 gfs2_rgrp_bh_put(gh->gh_gl->gl_object); 360 } 361 362 /** 363 * trans_go_xmote_th - promote/demote the transaction glock 364 * @gl: the glock 365 * @state: the requested state 366 * @flags: 367 * 368 */ 369 370 static void trans_go_xmote_th(struct gfs2_glock *gl) 371 { 372 struct gfs2_sbd *sdp = gl->gl_sbd; 373 374 if (gl->gl_state != LM_ST_UNLOCKED && 375 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 376 gfs2_meta_syncfs(sdp); 377 gfs2_log_shutdown(sdp); 378 } 379 } 380 381 /** 382 * trans_go_xmote_bh - After promoting/demoting the transaction glock 383 * @gl: the glock 384 * 385 */ 386 387 static void trans_go_xmote_bh(struct gfs2_glock *gl) 388 { 389 struct gfs2_sbd *sdp = gl->gl_sbd; 390 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); 391 struct gfs2_glock *j_gl = ip->i_gl; 392 struct gfs2_log_header_host head; 393 int error; 394 395 if (gl->gl_state != LM_ST_UNLOCKED && 396 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 397 gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode)); 398 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); 399 400 error = gfs2_find_jhead(sdp->sd_jdesc, &head); 401 if (error) 402 gfs2_consist(sdp); 403 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) 404 gfs2_consist(sdp); 405 406 /* Initialize some head of the log stuff */ 407 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) { 408 sdp->sd_log_sequence = head.lh_sequence + 1; 409 gfs2_log_pointers_init(sdp, head.lh_blkno); 410 } 411 } 412 } 413 414 /** 415 * trans_go_drop_th - unlock the transaction glock 416 * @gl: the glock 417 * 418 * We want to sync the device even with localcaching. Remember 419 * that localcaching journal replay only marks buffers dirty. 420 */ 421 422 static void trans_go_drop_th(struct gfs2_glock *gl) 423 { 424 struct gfs2_sbd *sdp = gl->gl_sbd; 425 426 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 427 gfs2_meta_syncfs(sdp); 428 gfs2_log_shutdown(sdp); 429 } 430 } 431 432 /** 433 * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock 434 * @gl: the glock 435 * 436 * Returns: 1 if it's ok 437 */ 438 439 static int quota_go_demote_ok(struct gfs2_glock *gl) 440 { 441 return !atomic_read(&gl->gl_lvb_count); 442 } 443 444 const struct gfs2_glock_operations gfs2_meta_glops = { 445 .go_xmote_th = meta_go_sync, 446 .go_drop_th = meta_go_sync, 447 .go_type = LM_TYPE_META, 448 }; 449 450 const struct gfs2_glock_operations gfs2_inode_glops = { 451 .go_xmote_th = inode_go_xmote_th, 452 .go_xmote_bh = inode_go_xmote_bh, 453 .go_drop_th = inode_go_drop_th, 454 .go_inval = inode_go_inval, 455 .go_demote_ok = inode_go_demote_ok, 456 .go_lock = inode_go_lock, 457 .go_unlock = inode_go_unlock, 458 .go_type = LM_TYPE_INODE, 459 }; 460 461 const struct gfs2_glock_operations gfs2_rgrp_glops = { 462 .go_inval = meta_go_inval, 463 .go_demote_ok = rgrp_go_demote_ok, 464 .go_lock = rgrp_go_lock, 465 .go_unlock = rgrp_go_unlock, 466 .go_type = LM_TYPE_RGRP, 467 }; 468 469 const struct gfs2_glock_operations gfs2_trans_glops = { 470 .go_xmote_th = trans_go_xmote_th, 471 .go_xmote_bh = trans_go_xmote_bh, 472 .go_drop_th = trans_go_drop_th, 473 .go_type = LM_TYPE_NONDISK, 474 }; 475 476 const struct gfs2_glock_operations gfs2_iopen_glops = { 477 .go_type = LM_TYPE_IOPEN, 478 }; 479 480 const struct gfs2_glock_operations gfs2_flock_glops = { 481 .go_type = LM_TYPE_FLOCK, 482 }; 483 484 const struct gfs2_glock_operations gfs2_nondisk_glops = { 485 .go_type = LM_TYPE_NONDISK, 486 }; 487 488 const struct gfs2_glock_operations gfs2_quota_glops = { 489 .go_demote_ok = quota_go_demote_ok, 490 .go_type = LM_TYPE_QUOTA, 491 }; 492 493 const struct gfs2_glock_operations gfs2_journal_glops = { 494 .go_type = LM_TYPE_JOURNAL, 495 }; 496 497