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 clear_bit(GIF_PAGED, &ip->i_flags); 249 } 250 } 251 252 /** 253 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock 254 * @gl: the glock 255 * 256 * Returns: 1 if it's ok 257 */ 258 259 static int inode_go_demote_ok(struct gfs2_glock *gl) 260 { 261 struct gfs2_sbd *sdp = gl->gl_sbd; 262 int demote = 0; 263 264 if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages) 265 demote = 1; 266 else if (!sdp->sd_args.ar_localcaching && 267 time_after_eq(jiffies, gl->gl_stamp + 268 gfs2_tune_get(sdp, gt_demote_secs) * HZ)) 269 demote = 1; 270 271 return demote; 272 } 273 274 /** 275 * inode_go_lock - operation done after an inode lock is locked by a process 276 * @gl: the glock 277 * @flags: 278 * 279 * Returns: errno 280 */ 281 282 static int inode_go_lock(struct gfs2_holder *gh) 283 { 284 struct gfs2_glock *gl = gh->gh_gl; 285 struct gfs2_inode *ip = gl->gl_object; 286 int error = 0; 287 288 if (!ip) 289 return 0; 290 291 if (test_bit(GIF_INVALID, &ip->i_flags)) { 292 error = gfs2_inode_refresh(ip); 293 if (error) 294 return error; 295 } 296 297 if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) && 298 (gl->gl_state == LM_ST_EXCLUSIVE) && 299 (gh->gh_state == LM_ST_EXCLUSIVE)) 300 error = gfs2_truncatei_resume(ip); 301 302 return error; 303 } 304 305 /** 306 * inode_go_unlock - operation done before an inode lock is unlocked by a 307 * process 308 * @gl: the glock 309 * @flags: 310 * 311 */ 312 313 static void inode_go_unlock(struct gfs2_holder *gh) 314 { 315 struct gfs2_glock *gl = gh->gh_gl; 316 struct gfs2_inode *ip = gl->gl_object; 317 318 if (ip) 319 gfs2_meta_cache_flush(ip); 320 } 321 322 /** 323 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock 324 * @gl: the glock 325 * 326 * Returns: 1 if it's ok 327 */ 328 329 static int rgrp_go_demote_ok(struct gfs2_glock *gl) 330 { 331 return !gl->gl_aspace->i_mapping->nrpages; 332 } 333 334 /** 335 * rgrp_go_lock - operation done after an rgrp lock is locked by 336 * a first holder on this node. 337 * @gl: the glock 338 * @flags: 339 * 340 * Returns: errno 341 */ 342 343 static int rgrp_go_lock(struct gfs2_holder *gh) 344 { 345 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object); 346 } 347 348 /** 349 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by 350 * a last holder on this node. 351 * @gl: the glock 352 * @flags: 353 * 354 */ 355 356 static void rgrp_go_unlock(struct gfs2_holder *gh) 357 { 358 gfs2_rgrp_bh_put(gh->gh_gl->gl_object); 359 } 360 361 /** 362 * trans_go_xmote_th - promote/demote the transaction glock 363 * @gl: the glock 364 * @state: the requested state 365 * @flags: 366 * 367 */ 368 369 static void trans_go_xmote_th(struct gfs2_glock *gl) 370 { 371 struct gfs2_sbd *sdp = gl->gl_sbd; 372 373 if (gl->gl_state != LM_ST_UNLOCKED && 374 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 375 gfs2_meta_syncfs(sdp); 376 gfs2_log_shutdown(sdp); 377 } 378 } 379 380 /** 381 * trans_go_xmote_bh - After promoting/demoting the transaction glock 382 * @gl: the glock 383 * 384 */ 385 386 static void trans_go_xmote_bh(struct gfs2_glock *gl) 387 { 388 struct gfs2_sbd *sdp = gl->gl_sbd; 389 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); 390 struct gfs2_glock *j_gl = ip->i_gl; 391 struct gfs2_log_header_host head; 392 int error; 393 394 if (gl->gl_state != LM_ST_UNLOCKED && 395 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 396 gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode)); 397 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); 398 399 error = gfs2_find_jhead(sdp->sd_jdesc, &head); 400 if (error) 401 gfs2_consist(sdp); 402 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) 403 gfs2_consist(sdp); 404 405 /* Initialize some head of the log stuff */ 406 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) { 407 sdp->sd_log_sequence = head.lh_sequence + 1; 408 gfs2_log_pointers_init(sdp, head.lh_blkno); 409 } 410 } 411 } 412 413 /** 414 * trans_go_drop_th - unlock the transaction glock 415 * @gl: the glock 416 * 417 * We want to sync the device even with localcaching. Remember 418 * that localcaching journal replay only marks buffers dirty. 419 */ 420 421 static void trans_go_drop_th(struct gfs2_glock *gl) 422 { 423 struct gfs2_sbd *sdp = gl->gl_sbd; 424 425 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 426 gfs2_meta_syncfs(sdp); 427 gfs2_log_shutdown(sdp); 428 } 429 } 430 431 /** 432 * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock 433 * @gl: the glock 434 * 435 * Returns: 1 if it's ok 436 */ 437 438 static int quota_go_demote_ok(struct gfs2_glock *gl) 439 { 440 return !atomic_read(&gl->gl_lvb_count); 441 } 442 443 const struct gfs2_glock_operations gfs2_meta_glops = { 444 .go_xmote_th = meta_go_sync, 445 .go_drop_th = meta_go_sync, 446 .go_type = LM_TYPE_META, 447 }; 448 449 const struct gfs2_glock_operations gfs2_inode_glops = { 450 .go_xmote_th = inode_go_xmote_th, 451 .go_xmote_bh = inode_go_xmote_bh, 452 .go_drop_th = inode_go_drop_th, 453 .go_inval = inode_go_inval, 454 .go_demote_ok = inode_go_demote_ok, 455 .go_lock = inode_go_lock, 456 .go_unlock = inode_go_unlock, 457 .go_type = LM_TYPE_INODE, 458 }; 459 460 const struct gfs2_glock_operations gfs2_rgrp_glops = { 461 .go_xmote_th = meta_go_sync, 462 .go_drop_th = meta_go_sync, 463 .go_inval = meta_go_inval, 464 .go_demote_ok = rgrp_go_demote_ok, 465 .go_lock = rgrp_go_lock, 466 .go_unlock = rgrp_go_unlock, 467 .go_type = LM_TYPE_RGRP, 468 }; 469 470 const struct gfs2_glock_operations gfs2_trans_glops = { 471 .go_xmote_th = trans_go_xmote_th, 472 .go_xmote_bh = trans_go_xmote_bh, 473 .go_drop_th = trans_go_drop_th, 474 .go_type = LM_TYPE_NONDISK, 475 }; 476 477 const struct gfs2_glock_operations gfs2_iopen_glops = { 478 .go_type = LM_TYPE_IOPEN, 479 }; 480 481 const struct gfs2_glock_operations gfs2_flock_glops = { 482 .go_type = LM_TYPE_FLOCK, 483 }; 484 485 const struct gfs2_glock_operations gfs2_nondisk_glops = { 486 .go_type = LM_TYPE_NONDISK, 487 }; 488 489 const struct gfs2_glock_operations gfs2_quota_glops = { 490 .go_demote_ok = quota_go_demote_ok, 491 .go_type = LM_TYPE_QUOTA, 492 }; 493 494 const struct gfs2_glock_operations gfs2_journal_glops = { 495 .go_type = LM_TYPE_JOURNAL, 496 }; 497 498