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/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 #include <linux/bio.h> 17 18 #include "gfs2.h" 19 #include "incore.h" 20 #include "bmap.h" 21 #include "glock.h" 22 #include "glops.h" 23 #include "inode.h" 24 #include "log.h" 25 #include "meta_io.h" 26 #include "recovery.h" 27 #include "rgrp.h" 28 #include "util.h" 29 #include "trans.h" 30 31 /** 32 * ail_empty_gl - remove all buffers for a given lock from the AIL 33 * @gl: the glock 34 * 35 * None of the buffers should be dirty, locked, or pinned. 36 */ 37 38 static void gfs2_ail_empty_gl(struct gfs2_glock *gl) 39 { 40 struct gfs2_sbd *sdp = gl->gl_sbd; 41 unsigned int blocks; 42 struct list_head *head = &gl->gl_ail_list; 43 struct gfs2_bufdata *bd; 44 struct buffer_head *bh; 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 gfs2_remove_from_ail(bd); 61 bd->bd_bh = NULL; 62 bh->b_private = NULL; 63 bd->bd_blkno = bh->b_blocknr; 64 gfs2_assert_withdraw(sdp, !buffer_busy(bh)); 65 gfs2_trans_add_revoke(sdp, bd); 66 } 67 gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count)); 68 gfs2_log_unlock(sdp); 69 70 gfs2_trans_end(sdp); 71 gfs2_log_flush(sdp, NULL); 72 } 73 74 /** 75 * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock 76 * @gl: the glock 77 * 78 */ 79 80 static void gfs2_pte_inval(struct gfs2_glock *gl) 81 { 82 struct gfs2_inode *ip; 83 struct inode *inode; 84 85 ip = gl->gl_object; 86 inode = &ip->i_inode; 87 if (!ip || !S_ISREG(inode->i_mode)) 88 return; 89 90 unmap_shared_mapping_range(inode->i_mapping, 0, 0); 91 if (test_bit(GIF_SW_PAGED, &ip->i_flags)) 92 set_bit(GLF_DIRTY, &gl->gl_flags); 93 94 } 95 96 /** 97 * meta_go_sync - sync out the metadata for this glock 98 * @gl: the glock 99 * 100 * Called when demoting or unlocking an EX glock. We must flush 101 * to disk all dirty buffers/pages relating to this glock, and must not 102 * not return to caller to demote/unlock the glock until I/O is complete. 103 */ 104 105 static void meta_go_sync(struct gfs2_glock *gl) 106 { 107 if (gl->gl_state != LM_ST_EXCLUSIVE) 108 return; 109 110 if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) { 111 gfs2_log_flush(gl->gl_sbd, gl); 112 gfs2_meta_sync(gl); 113 gfs2_ail_empty_gl(gl); 114 } 115 } 116 117 /** 118 * meta_go_inval - invalidate the metadata for this glock 119 * @gl: the glock 120 * @flags: 121 * 122 */ 123 124 static void meta_go_inval(struct gfs2_glock *gl, int flags) 125 { 126 if (!(flags & DIO_METADATA)) 127 return; 128 129 gfs2_meta_inval(gl); 130 if (gl->gl_object == GFS2_I(gl->gl_sbd->sd_rindex)) 131 gl->gl_sbd->sd_rindex_uptodate = 0; 132 else if (gl->gl_ops == &gfs2_rgrp_glops && gl->gl_object) { 133 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object; 134 135 rgd->rd_flags &= ~GFS2_RDF_UPTODATE; 136 } 137 } 138 139 /** 140 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock 141 * @gl: the glock protecting the inode 142 * 143 */ 144 145 static void inode_go_sync(struct gfs2_glock *gl) 146 { 147 struct gfs2_inode *ip = gl->gl_object; 148 struct address_space *metamapping = gl->gl_aspace->i_mapping; 149 int error; 150 151 if (gl->gl_state != LM_ST_UNLOCKED) 152 gfs2_pte_inval(gl); 153 if (gl->gl_state != LM_ST_EXCLUSIVE) 154 return; 155 156 if (ip && !S_ISREG(ip->i_inode.i_mode)) 157 ip = NULL; 158 159 if (test_bit(GLF_DIRTY, &gl->gl_flags)) { 160 gfs2_log_flush(gl->gl_sbd, gl); 161 filemap_fdatawrite(metamapping); 162 if (ip) { 163 struct address_space *mapping = ip->i_inode.i_mapping; 164 filemap_fdatawrite(mapping); 165 error = filemap_fdatawait(mapping); 166 mapping_set_error(mapping, error); 167 } 168 error = filemap_fdatawait(metamapping); 169 mapping_set_error(metamapping, error); 170 clear_bit(GLF_DIRTY, &gl->gl_flags); 171 gfs2_ail_empty_gl(gl); 172 } 173 } 174 175 /** 176 * inode_go_inval - prepare a inode glock to be released 177 * @gl: the glock 178 * @flags: 179 * 180 */ 181 182 static void inode_go_inval(struct gfs2_glock *gl, int flags) 183 { 184 struct gfs2_inode *ip = gl->gl_object; 185 int meta = (flags & DIO_METADATA); 186 187 if (meta) { 188 gfs2_meta_inval(gl); 189 if (ip) 190 set_bit(GIF_INVALID, &ip->i_flags); 191 } 192 193 if (ip && S_ISREG(ip->i_inode.i_mode)) 194 truncate_inode_pages(ip->i_inode.i_mapping, 0); 195 } 196 197 /** 198 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock 199 * @gl: the glock 200 * 201 * Returns: 1 if it's ok 202 */ 203 204 static int inode_go_demote_ok(struct gfs2_glock *gl) 205 { 206 struct gfs2_sbd *sdp = gl->gl_sbd; 207 int demote = 0; 208 209 if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages) 210 demote = 1; 211 else if (!sdp->sd_args.ar_localcaching && 212 time_after_eq(jiffies, gl->gl_stamp + 213 gfs2_tune_get(sdp, gt_demote_secs) * HZ)) 214 demote = 1; 215 216 return demote; 217 } 218 219 /** 220 * inode_go_lock - operation done after an inode lock is locked by a process 221 * @gl: the glock 222 * @flags: 223 * 224 * Returns: errno 225 */ 226 227 static int inode_go_lock(struct gfs2_holder *gh) 228 { 229 struct gfs2_glock *gl = gh->gh_gl; 230 struct gfs2_inode *ip = gl->gl_object; 231 int error = 0; 232 233 if (!ip || (gh->gh_flags & GL_SKIP)) 234 return 0; 235 236 if (test_bit(GIF_INVALID, &ip->i_flags)) { 237 error = gfs2_inode_refresh(ip); 238 if (error) 239 return error; 240 } 241 242 if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) && 243 (gl->gl_state == LM_ST_EXCLUSIVE) && 244 (gh->gh_state == LM_ST_EXCLUSIVE)) 245 error = gfs2_truncatei_resume(ip); 246 247 return error; 248 } 249 250 /** 251 * inode_go_dump - print information about an inode 252 * @seq: The iterator 253 * @ip: the inode 254 * 255 * Returns: 0 on success, -ENOBUFS when we run out of space 256 */ 257 258 static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl) 259 { 260 const struct gfs2_inode *ip = gl->gl_object; 261 if (ip == NULL) 262 return 0; 263 gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%08lx\n", 264 (unsigned long long)ip->i_no_formal_ino, 265 (unsigned long long)ip->i_no_addr, 266 IF2DT(ip->i_inode.i_mode), ip->i_flags); 267 return 0; 268 } 269 270 /** 271 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock 272 * @gl: the glock 273 * 274 * Returns: 1 if it's ok 275 */ 276 277 static int rgrp_go_demote_ok(struct gfs2_glock *gl) 278 { 279 return !gl->gl_aspace->i_mapping->nrpages; 280 } 281 282 /** 283 * rgrp_go_lock - operation done after an rgrp lock is locked by 284 * a first holder on this node. 285 * @gl: the glock 286 * @flags: 287 * 288 * Returns: errno 289 */ 290 291 static int rgrp_go_lock(struct gfs2_holder *gh) 292 { 293 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object); 294 } 295 296 /** 297 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by 298 * a last holder on this node. 299 * @gl: the glock 300 * @flags: 301 * 302 */ 303 304 static void rgrp_go_unlock(struct gfs2_holder *gh) 305 { 306 gfs2_rgrp_bh_put(gh->gh_gl->gl_object); 307 } 308 309 /** 310 * rgrp_go_dump - print out an rgrp 311 * @seq: The iterator 312 * @gl: The glock in question 313 * 314 */ 315 316 static int rgrp_go_dump(struct seq_file *seq, const struct gfs2_glock *gl) 317 { 318 const struct gfs2_rgrpd *rgd = gl->gl_object; 319 if (rgd == NULL) 320 return 0; 321 gfs2_print_dbg(seq, " R: n:%llu\n", (unsigned long long)rgd->rd_addr); 322 return 0; 323 } 324 325 /** 326 * trans_go_sync - promote/demote the transaction glock 327 * @gl: the glock 328 * @state: the requested state 329 * @flags: 330 * 331 */ 332 333 static void trans_go_sync(struct gfs2_glock *gl) 334 { 335 struct gfs2_sbd *sdp = gl->gl_sbd; 336 337 if (gl->gl_state != LM_ST_UNLOCKED && 338 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 339 gfs2_meta_syncfs(sdp); 340 gfs2_log_shutdown(sdp); 341 } 342 } 343 344 /** 345 * trans_go_xmote_bh - After promoting/demoting the transaction glock 346 * @gl: the glock 347 * 348 */ 349 350 static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh) 351 { 352 struct gfs2_sbd *sdp = gl->gl_sbd; 353 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); 354 struct gfs2_glock *j_gl = ip->i_gl; 355 struct gfs2_log_header_host head; 356 int error; 357 358 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 359 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); 360 361 error = gfs2_find_jhead(sdp->sd_jdesc, &head); 362 if (error) 363 gfs2_consist(sdp); 364 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) 365 gfs2_consist(sdp); 366 367 /* Initialize some head of the log stuff */ 368 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) { 369 sdp->sd_log_sequence = head.lh_sequence + 1; 370 gfs2_log_pointers_init(sdp, head.lh_blkno); 371 } 372 } 373 return 0; 374 } 375 376 /** 377 * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock 378 * @gl: the glock 379 * 380 * Returns: 1 if it's ok 381 */ 382 383 static int quota_go_demote_ok(struct gfs2_glock *gl) 384 { 385 return !atomic_read(&gl->gl_lvb_count); 386 } 387 388 const struct gfs2_glock_operations gfs2_meta_glops = { 389 .go_xmote_th = meta_go_sync, 390 .go_type = LM_TYPE_META, 391 }; 392 393 const struct gfs2_glock_operations gfs2_inode_glops = { 394 .go_xmote_th = inode_go_sync, 395 .go_inval = inode_go_inval, 396 .go_demote_ok = inode_go_demote_ok, 397 .go_lock = inode_go_lock, 398 .go_dump = inode_go_dump, 399 .go_type = LM_TYPE_INODE, 400 .go_min_hold_time = HZ / 5, 401 }; 402 403 const struct gfs2_glock_operations gfs2_rgrp_glops = { 404 .go_xmote_th = meta_go_sync, 405 .go_inval = meta_go_inval, 406 .go_demote_ok = rgrp_go_demote_ok, 407 .go_lock = rgrp_go_lock, 408 .go_unlock = rgrp_go_unlock, 409 .go_dump = rgrp_go_dump, 410 .go_type = LM_TYPE_RGRP, 411 .go_min_hold_time = HZ / 5, 412 }; 413 414 const struct gfs2_glock_operations gfs2_trans_glops = { 415 .go_xmote_th = trans_go_sync, 416 .go_xmote_bh = trans_go_xmote_bh, 417 .go_type = LM_TYPE_NONDISK, 418 }; 419 420 const struct gfs2_glock_operations gfs2_iopen_glops = { 421 .go_type = LM_TYPE_IOPEN, 422 }; 423 424 const struct gfs2_glock_operations gfs2_flock_glops = { 425 .go_type = LM_TYPE_FLOCK, 426 }; 427 428 const struct gfs2_glock_operations gfs2_nondisk_glops = { 429 .go_type = LM_TYPE_NONDISK, 430 }; 431 432 const struct gfs2_glock_operations gfs2_quota_glops = { 433 .go_demote_ok = quota_go_demote_ok, 434 .go_type = LM_TYPE_QUOTA, 435 }; 436 437 const struct gfs2_glock_operations gfs2_journal_glops = { 438 .go_type = LM_TYPE_JOURNAL, 439 }; 440 441