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 int error; 45 46 blocks = atomic_read(&gl->gl_ail_count); 47 if (!blocks) 48 return; 49 50 error = gfs2_trans_begin(sdp, 0, blocks); 51 if (gfs2_assert_withdraw(sdp, !error)) 52 return; 53 54 gfs2_log_lock(sdp); 55 while (!list_empty(head)) { 56 bd = list_entry(head->next, struct gfs2_bufdata, 57 bd_ail_gl_list); 58 bh = bd->bd_bh; 59 gfs2_remove_from_ail(bd); 60 bd->bd_bh = NULL; 61 bh->b_private = NULL; 62 bd->bd_blkno = bh->b_blocknr; 63 gfs2_assert_withdraw(sdp, !buffer_busy(bh)); 64 gfs2_trans_add_revoke(sdp, bd); 65 } 66 gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count)); 67 gfs2_log_unlock(sdp); 68 69 gfs2_trans_end(sdp); 70 gfs2_log_flush(sdp, NULL); 71 } 72 73 /** 74 * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock 75 * @gl: the glock 76 * 77 */ 78 79 static void gfs2_pte_inval(struct gfs2_glock *gl) 80 { 81 struct gfs2_inode *ip; 82 struct inode *inode; 83 84 ip = gl->gl_object; 85 inode = &ip->i_inode; 86 if (!ip || !S_ISREG(inode->i_mode)) 87 return; 88 89 unmap_shared_mapping_range(inode->i_mapping, 0, 0); 90 if (test_bit(GIF_SW_PAGED, &ip->i_flags)) 91 set_bit(GLF_DIRTY, &gl->gl_flags); 92 93 } 94 95 /** 96 * meta_go_sync - sync out the metadata for this glock 97 * @gl: the glock 98 * 99 * Called when demoting or unlocking an EX glock. We must flush 100 * to disk all dirty buffers/pages relating to this glock, and must not 101 * not return to caller to demote/unlock the glock until I/O is complete. 102 */ 103 104 static void meta_go_sync(struct gfs2_glock *gl) 105 { 106 if (gl->gl_state != LM_ST_EXCLUSIVE) 107 return; 108 109 if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) { 110 gfs2_log_flush(gl->gl_sbd, gl); 111 gfs2_meta_sync(gl); 112 gfs2_ail_empty_gl(gl); 113 } 114 } 115 116 /** 117 * meta_go_inval - invalidate the metadata for this glock 118 * @gl: the glock 119 * @flags: 120 * 121 */ 122 123 static void meta_go_inval(struct gfs2_glock *gl, int flags) 124 { 125 if (!(flags & DIO_METADATA)) 126 return; 127 128 gfs2_meta_inval(gl); 129 gl->gl_vn++; 130 } 131 132 /** 133 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock 134 * @gl: the glock protecting the inode 135 * 136 */ 137 138 static void inode_go_sync(struct gfs2_glock *gl) 139 { 140 struct gfs2_inode *ip = gl->gl_object; 141 struct address_space *metamapping = gl->gl_aspace->i_mapping; 142 int error; 143 144 if (gl->gl_state != LM_ST_UNLOCKED) 145 gfs2_pte_inval(gl); 146 if (gl->gl_state != LM_ST_EXCLUSIVE) 147 return; 148 149 if (ip && !S_ISREG(ip->i_inode.i_mode)) 150 ip = NULL; 151 152 if (test_bit(GLF_DIRTY, &gl->gl_flags)) { 153 gfs2_log_flush(gl->gl_sbd, gl); 154 filemap_fdatawrite(metamapping); 155 if (ip) { 156 struct address_space *mapping = ip->i_inode.i_mapping; 157 filemap_fdatawrite(mapping); 158 error = filemap_fdatawait(mapping); 159 mapping_set_error(mapping, error); 160 } 161 error = filemap_fdatawait(metamapping); 162 mapping_set_error(metamapping, error); 163 clear_bit(GLF_DIRTY, &gl->gl_flags); 164 gfs2_ail_empty_gl(gl); 165 } 166 } 167 168 /** 169 * inode_go_xmote_bh - After promoting/demoting a glock 170 * @gl: the glock 171 * 172 */ 173 174 static void inode_go_xmote_bh(struct gfs2_glock *gl) 175 { 176 struct gfs2_holder *gh = gl->gl_req_gh; 177 struct buffer_head *bh; 178 int error; 179 180 if (gl->gl_state != LM_ST_UNLOCKED && 181 (!gh || !(gh->gh_flags & GL_SKIP))) { 182 error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh); 183 if (!error) 184 brelse(bh); 185 } 186 } 187 188 /** 189 * inode_go_inval - prepare a inode glock to be released 190 * @gl: the glock 191 * @flags: 192 * 193 */ 194 195 static void inode_go_inval(struct gfs2_glock *gl, int flags) 196 { 197 struct gfs2_inode *ip = gl->gl_object; 198 int meta = (flags & DIO_METADATA); 199 200 if (meta) { 201 gfs2_meta_inval(gl); 202 if (ip) 203 set_bit(GIF_INVALID, &ip->i_flags); 204 } 205 206 if (ip && S_ISREG(ip->i_inode.i_mode)) 207 truncate_inode_pages(ip->i_inode.i_mapping, 0); 208 } 209 210 /** 211 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock 212 * @gl: the glock 213 * 214 * Returns: 1 if it's ok 215 */ 216 217 static int inode_go_demote_ok(struct gfs2_glock *gl) 218 { 219 struct gfs2_sbd *sdp = gl->gl_sbd; 220 int demote = 0; 221 222 if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages) 223 demote = 1; 224 else if (!sdp->sd_args.ar_localcaching && 225 time_after_eq(jiffies, gl->gl_stamp + 226 gfs2_tune_get(sdp, gt_demote_secs) * HZ)) 227 demote = 1; 228 229 return demote; 230 } 231 232 /** 233 * inode_go_lock - operation done after an inode lock is locked by a process 234 * @gl: the glock 235 * @flags: 236 * 237 * Returns: errno 238 */ 239 240 static int inode_go_lock(struct gfs2_holder *gh) 241 { 242 struct gfs2_glock *gl = gh->gh_gl; 243 struct gfs2_inode *ip = gl->gl_object; 244 int error = 0; 245 246 if (!ip) 247 return 0; 248 249 if (test_bit(GIF_INVALID, &ip->i_flags)) { 250 error = gfs2_inode_refresh(ip); 251 if (error) 252 return error; 253 } 254 255 if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) && 256 (gl->gl_state == LM_ST_EXCLUSIVE) && 257 (gh->gh_state == LM_ST_EXCLUSIVE)) 258 error = gfs2_truncatei_resume(ip); 259 260 return error; 261 } 262 263 /** 264 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock 265 * @gl: the glock 266 * 267 * Returns: 1 if it's ok 268 */ 269 270 static int rgrp_go_demote_ok(struct gfs2_glock *gl) 271 { 272 return !gl->gl_aspace->i_mapping->nrpages; 273 } 274 275 /** 276 * rgrp_go_lock - operation done after an rgrp lock is locked by 277 * a first holder on this node. 278 * @gl: the glock 279 * @flags: 280 * 281 * Returns: errno 282 */ 283 284 static int rgrp_go_lock(struct gfs2_holder *gh) 285 { 286 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object); 287 } 288 289 /** 290 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by 291 * a last holder on this node. 292 * @gl: the glock 293 * @flags: 294 * 295 */ 296 297 static void rgrp_go_unlock(struct gfs2_holder *gh) 298 { 299 gfs2_rgrp_bh_put(gh->gh_gl->gl_object); 300 } 301 302 /** 303 * trans_go_sync - promote/demote the transaction glock 304 * @gl: the glock 305 * @state: the requested state 306 * @flags: 307 * 308 */ 309 310 static void trans_go_sync(struct gfs2_glock *gl) 311 { 312 struct gfs2_sbd *sdp = gl->gl_sbd; 313 314 if (gl->gl_state != LM_ST_UNLOCKED && 315 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 316 gfs2_meta_syncfs(sdp); 317 gfs2_log_shutdown(sdp); 318 } 319 } 320 321 /** 322 * trans_go_xmote_bh - After promoting/demoting the transaction glock 323 * @gl: the glock 324 * 325 */ 326 327 static void trans_go_xmote_bh(struct gfs2_glock *gl) 328 { 329 struct gfs2_sbd *sdp = gl->gl_sbd; 330 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); 331 struct gfs2_glock *j_gl = ip->i_gl; 332 struct gfs2_log_header_host head; 333 int error; 334 335 if (gl->gl_state != LM_ST_UNLOCKED && 336 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 337 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); 338 339 error = gfs2_find_jhead(sdp->sd_jdesc, &head); 340 if (error) 341 gfs2_consist(sdp); 342 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) 343 gfs2_consist(sdp); 344 345 /* Initialize some head of the log stuff */ 346 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) { 347 sdp->sd_log_sequence = head.lh_sequence + 1; 348 gfs2_log_pointers_init(sdp, head.lh_blkno); 349 } 350 } 351 } 352 353 /** 354 * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock 355 * @gl: the glock 356 * 357 * Returns: 1 if it's ok 358 */ 359 360 static int quota_go_demote_ok(struct gfs2_glock *gl) 361 { 362 return !atomic_read(&gl->gl_lvb_count); 363 } 364 365 const struct gfs2_glock_operations gfs2_meta_glops = { 366 .go_xmote_th = meta_go_sync, 367 .go_type = LM_TYPE_META, 368 }; 369 370 const struct gfs2_glock_operations gfs2_inode_glops = { 371 .go_xmote_th = inode_go_sync, 372 .go_xmote_bh = inode_go_xmote_bh, 373 .go_inval = inode_go_inval, 374 .go_demote_ok = inode_go_demote_ok, 375 .go_lock = inode_go_lock, 376 .go_type = LM_TYPE_INODE, 377 .go_min_hold_time = HZ / 10, 378 }; 379 380 const struct gfs2_glock_operations gfs2_rgrp_glops = { 381 .go_xmote_th = meta_go_sync, 382 .go_inval = meta_go_inval, 383 .go_demote_ok = rgrp_go_demote_ok, 384 .go_lock = rgrp_go_lock, 385 .go_unlock = rgrp_go_unlock, 386 .go_type = LM_TYPE_RGRP, 387 .go_min_hold_time = HZ / 10, 388 }; 389 390 const struct gfs2_glock_operations gfs2_trans_glops = { 391 .go_xmote_th = trans_go_sync, 392 .go_xmote_bh = trans_go_xmote_bh, 393 .go_type = LM_TYPE_NONDISK, 394 }; 395 396 const struct gfs2_glock_operations gfs2_iopen_glops = { 397 .go_type = LM_TYPE_IOPEN, 398 }; 399 400 const struct gfs2_glock_operations gfs2_flock_glops = { 401 .go_type = LM_TYPE_FLOCK, 402 }; 403 404 const struct gfs2_glock_operations gfs2_nondisk_glops = { 405 .go_type = LM_TYPE_NONDISK, 406 }; 407 408 const struct gfs2_glock_operations gfs2_quota_glops = { 409 .go_demote_ok = quota_go_demote_ok, 410 .go_type = LM_TYPE_QUOTA, 411 }; 412 413 const struct gfs2_glock_operations gfs2_journal_glops = { 414 .go_type = LM_TYPE_JOURNAL, 415 }; 416 417