1 /* 2 * Copyright (c) 2000-2003 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 #include "xfs.h" 19 #include "xfs_fs.h" 20 #include "xfs_format.h" 21 #include "xfs_log.h" 22 #include "xfs_trans.h" 23 #include "xfs_sb.h" 24 #include "xfs_ag.h" 25 #include "xfs_alloc.h" 26 #include "xfs_quota.h" 27 #include "xfs_mount.h" 28 #include "xfs_bmap_btree.h" 29 #include "xfs_inode.h" 30 #include "xfs_bmap.h" 31 #include "xfs_rtalloc.h" 32 #include "xfs_error.h" 33 #include "xfs_itable.h" 34 #include "xfs_attr.h" 35 #include "xfs_buf_item.h" 36 #include "xfs_trans_priv.h" 37 #include "xfs_qm.h" 38 39 static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip) 40 { 41 return container_of(lip, struct xfs_dq_logitem, qli_item); 42 } 43 44 /* 45 * returns the number of iovecs needed to log the given dquot item. 46 */ 47 STATIC void 48 xfs_qm_dquot_logitem_size( 49 struct xfs_log_item *lip, 50 int *nvecs, 51 int *nbytes) 52 { 53 *nvecs += 2; 54 *nbytes += sizeof(struct xfs_dq_logformat) + 55 sizeof(struct xfs_disk_dquot); 56 } 57 58 /* 59 * fills in the vector of log iovecs for the given dquot log item. 60 */ 61 STATIC void 62 xfs_qm_dquot_logitem_format( 63 struct xfs_log_item *lip, 64 struct xfs_log_iovec *logvec) 65 { 66 struct xfs_dq_logitem *qlip = DQUOT_ITEM(lip); 67 68 logvec->i_addr = &qlip->qli_format; 69 logvec->i_len = sizeof(xfs_dq_logformat_t); 70 logvec->i_type = XLOG_REG_TYPE_QFORMAT; 71 logvec++; 72 logvec->i_addr = &qlip->qli_dquot->q_core; 73 logvec->i_len = sizeof(xfs_disk_dquot_t); 74 logvec->i_type = XLOG_REG_TYPE_DQUOT; 75 76 qlip->qli_format.qlf_size = 2; 77 78 } 79 80 /* 81 * Increment the pin count of the given dquot. 82 */ 83 STATIC void 84 xfs_qm_dquot_logitem_pin( 85 struct xfs_log_item *lip) 86 { 87 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot; 88 89 ASSERT(XFS_DQ_IS_LOCKED(dqp)); 90 atomic_inc(&dqp->q_pincount); 91 } 92 93 /* 94 * Decrement the pin count of the given dquot, and wake up 95 * anyone in xfs_dqwait_unpin() if the count goes to 0. The 96 * dquot must have been previously pinned with a call to 97 * xfs_qm_dquot_logitem_pin(). 98 */ 99 STATIC void 100 xfs_qm_dquot_logitem_unpin( 101 struct xfs_log_item *lip, 102 int remove) 103 { 104 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot; 105 106 ASSERT(atomic_read(&dqp->q_pincount) > 0); 107 if (atomic_dec_and_test(&dqp->q_pincount)) 108 wake_up(&dqp->q_pinwait); 109 } 110 111 STATIC xfs_lsn_t 112 xfs_qm_dquot_logitem_committed( 113 struct xfs_log_item *lip, 114 xfs_lsn_t lsn) 115 { 116 /* 117 * We always re-log the entire dquot when it becomes dirty, 118 * so, the latest copy _is_ the only one that matters. 119 */ 120 return lsn; 121 } 122 123 /* 124 * This is called to wait for the given dquot to be unpinned. 125 * Most of these pin/unpin routines are plagiarized from inode code. 126 */ 127 void 128 xfs_qm_dqunpin_wait( 129 struct xfs_dquot *dqp) 130 { 131 ASSERT(XFS_DQ_IS_LOCKED(dqp)); 132 if (atomic_read(&dqp->q_pincount) == 0) 133 return; 134 135 /* 136 * Give the log a push so we don't wait here too long. 137 */ 138 xfs_log_force(dqp->q_mount, 0); 139 wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0)); 140 } 141 142 STATIC uint 143 xfs_qm_dquot_logitem_push( 144 struct xfs_log_item *lip, 145 struct list_head *buffer_list) 146 { 147 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot; 148 struct xfs_buf *bp = NULL; 149 uint rval = XFS_ITEM_SUCCESS; 150 int error; 151 152 if (atomic_read(&dqp->q_pincount) > 0) 153 return XFS_ITEM_PINNED; 154 155 if (!xfs_dqlock_nowait(dqp)) 156 return XFS_ITEM_LOCKED; 157 158 /* 159 * Re-check the pincount now that we stabilized the value by 160 * taking the quota lock. 161 */ 162 if (atomic_read(&dqp->q_pincount) > 0) { 163 rval = XFS_ITEM_PINNED; 164 goto out_unlock; 165 } 166 167 /* 168 * Someone else is already flushing the dquot. Nothing we can do 169 * here but wait for the flush to finish and remove the item from 170 * the AIL. 171 */ 172 if (!xfs_dqflock_nowait(dqp)) { 173 rval = XFS_ITEM_FLUSHING; 174 goto out_unlock; 175 } 176 177 spin_unlock(&lip->li_ailp->xa_lock); 178 179 error = xfs_qm_dqflush(dqp, &bp); 180 if (error) { 181 xfs_warn(dqp->q_mount, "%s: push error %d on dqp %p", 182 __func__, error, dqp); 183 } else { 184 if (!xfs_buf_delwri_queue(bp, buffer_list)) 185 rval = XFS_ITEM_FLUSHING; 186 xfs_buf_relse(bp); 187 } 188 189 spin_lock(&lip->li_ailp->xa_lock); 190 out_unlock: 191 xfs_dqunlock(dqp); 192 return rval; 193 } 194 195 /* 196 * Unlock the dquot associated with the log item. 197 * Clear the fields of the dquot and dquot log item that 198 * are specific to the current transaction. If the 199 * hold flags is set, do not unlock the dquot. 200 */ 201 STATIC void 202 xfs_qm_dquot_logitem_unlock( 203 struct xfs_log_item *lip) 204 { 205 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot; 206 207 ASSERT(XFS_DQ_IS_LOCKED(dqp)); 208 209 /* 210 * Clear the transaction pointer in the dquot 211 */ 212 dqp->q_transp = NULL; 213 214 /* 215 * dquots are never 'held' from getting unlocked at the end of 216 * a transaction. Their locking and unlocking is hidden inside the 217 * transaction layer, within trans_commit. Hence, no LI_HOLD flag 218 * for the logitem. 219 */ 220 xfs_dqunlock(dqp); 221 } 222 223 /* 224 * this needs to stamp an lsn into the dquot, I think. 225 * rpc's that look at user dquot's would then have to 226 * push on the dependency recorded in the dquot 227 */ 228 STATIC void 229 xfs_qm_dquot_logitem_committing( 230 struct xfs_log_item *lip, 231 xfs_lsn_t lsn) 232 { 233 } 234 235 /* 236 * This is the ops vector for dquots 237 */ 238 static const struct xfs_item_ops xfs_dquot_item_ops = { 239 .iop_size = xfs_qm_dquot_logitem_size, 240 .iop_format = xfs_qm_dquot_logitem_format, 241 .iop_pin = xfs_qm_dquot_logitem_pin, 242 .iop_unpin = xfs_qm_dquot_logitem_unpin, 243 .iop_unlock = xfs_qm_dquot_logitem_unlock, 244 .iop_committed = xfs_qm_dquot_logitem_committed, 245 .iop_push = xfs_qm_dquot_logitem_push, 246 .iop_committing = xfs_qm_dquot_logitem_committing 247 }; 248 249 /* 250 * Initialize the dquot log item for a newly allocated dquot. 251 * The dquot isn't locked at this point, but it isn't on any of the lists 252 * either, so we don't care. 253 */ 254 void 255 xfs_qm_dquot_logitem_init( 256 struct xfs_dquot *dqp) 257 { 258 struct xfs_dq_logitem *lp = &dqp->q_logitem; 259 260 xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT, 261 &xfs_dquot_item_ops); 262 lp->qli_dquot = dqp; 263 lp->qli_format.qlf_type = XFS_LI_DQUOT; 264 lp->qli_format.qlf_id = be32_to_cpu(dqp->q_core.d_id); 265 lp->qli_format.qlf_blkno = dqp->q_blkno; 266 lp->qli_format.qlf_len = 1; 267 /* 268 * This is just the offset of this dquot within its buffer 269 * (which is currently 1 FSB and probably won't change). 270 * Hence 32 bits for this offset should be just fine. 271 * Alternatively, we can store (bufoffset / sizeof(xfs_dqblk_t)) 272 * here, and recompute it at recovery time. 273 */ 274 lp->qli_format.qlf_boffset = (__uint32_t)dqp->q_bufoffset; 275 } 276 277 /*------------------ QUOTAOFF LOG ITEMS -------------------*/ 278 279 static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip) 280 { 281 return container_of(lip, struct xfs_qoff_logitem, qql_item); 282 } 283 284 285 /* 286 * This returns the number of iovecs needed to log the given quotaoff item. 287 * We only need 1 iovec for an quotaoff item. It just logs the 288 * quotaoff_log_format structure. 289 */ 290 STATIC void 291 xfs_qm_qoff_logitem_size( 292 struct xfs_log_item *lip, 293 int *nvecs, 294 int *nbytes) 295 { 296 *nvecs += 1; 297 *nbytes += sizeof(struct xfs_qoff_logitem); 298 } 299 300 /* 301 * This is called to fill in the vector of log iovecs for the 302 * given quotaoff log item. We use only 1 iovec, and we point that 303 * at the quotaoff_log_format structure embedded in the quotaoff item. 304 * It is at this point that we assert that all of the extent 305 * slots in the quotaoff item have been filled. 306 */ 307 STATIC void 308 xfs_qm_qoff_logitem_format( 309 struct xfs_log_item *lip, 310 struct xfs_log_iovec *log_vector) 311 { 312 struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip); 313 314 ASSERT(qflip->qql_format.qf_type == XFS_LI_QUOTAOFF); 315 316 log_vector->i_addr = &qflip->qql_format; 317 log_vector->i_len = sizeof(xfs_qoff_logitem_t); 318 log_vector->i_type = XLOG_REG_TYPE_QUOTAOFF; 319 qflip->qql_format.qf_size = 1; 320 } 321 322 /* 323 * Pinning has no meaning for an quotaoff item, so just return. 324 */ 325 STATIC void 326 xfs_qm_qoff_logitem_pin( 327 struct xfs_log_item *lip) 328 { 329 } 330 331 /* 332 * Since pinning has no meaning for an quotaoff item, unpinning does 333 * not either. 334 */ 335 STATIC void 336 xfs_qm_qoff_logitem_unpin( 337 struct xfs_log_item *lip, 338 int remove) 339 { 340 } 341 342 /* 343 * There isn't much you can do to push a quotaoff item. It is simply 344 * stuck waiting for the log to be flushed to disk. 345 */ 346 STATIC uint 347 xfs_qm_qoff_logitem_push( 348 struct xfs_log_item *lip, 349 struct list_head *buffer_list) 350 { 351 return XFS_ITEM_LOCKED; 352 } 353 354 /* 355 * Quotaoff items have no locking or pushing, so return failure 356 * so that the caller doesn't bother with us. 357 */ 358 STATIC void 359 xfs_qm_qoff_logitem_unlock( 360 struct xfs_log_item *lip) 361 { 362 } 363 364 /* 365 * The quotaoff-start-item is logged only once and cannot be moved in the log, 366 * so simply return the lsn at which it's been logged. 367 */ 368 STATIC xfs_lsn_t 369 xfs_qm_qoff_logitem_committed( 370 struct xfs_log_item *lip, 371 xfs_lsn_t lsn) 372 { 373 return lsn; 374 } 375 376 STATIC xfs_lsn_t 377 xfs_qm_qoffend_logitem_committed( 378 struct xfs_log_item *lip, 379 xfs_lsn_t lsn) 380 { 381 struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip); 382 struct xfs_qoff_logitem *qfs = qfe->qql_start_lip; 383 struct xfs_ail *ailp = qfs->qql_item.li_ailp; 384 385 /* 386 * Delete the qoff-start logitem from the AIL. 387 * xfs_trans_ail_delete() drops the AIL lock. 388 */ 389 spin_lock(&ailp->xa_lock); 390 xfs_trans_ail_delete(ailp, &qfs->qql_item, SHUTDOWN_LOG_IO_ERROR); 391 392 kmem_free(qfs); 393 kmem_free(qfe); 394 return (xfs_lsn_t)-1; 395 } 396 397 /* 398 * XXX rcc - don't know quite what to do with this. I think we can 399 * just ignore it. The only time that isn't the case is if we allow 400 * the client to somehow see that quotas have been turned off in which 401 * we can't allow that to get back until the quotaoff hits the disk. 402 * So how would that happen? Also, do we need different routines for 403 * quotaoff start and quotaoff end? I suspect the answer is yes but 404 * to be sure, I need to look at the recovery code and see how quota off 405 * recovery is handled (do we roll forward or back or do something else). 406 * If we roll forwards or backwards, then we need two separate routines, 407 * one that does nothing and one that stamps in the lsn that matters 408 * (truly makes the quotaoff irrevocable). If we do something else, 409 * then maybe we don't need two. 410 */ 411 STATIC void 412 xfs_qm_qoff_logitem_committing( 413 struct xfs_log_item *lip, 414 xfs_lsn_t commit_lsn) 415 { 416 } 417 418 static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = { 419 .iop_size = xfs_qm_qoff_logitem_size, 420 .iop_format = xfs_qm_qoff_logitem_format, 421 .iop_pin = xfs_qm_qoff_logitem_pin, 422 .iop_unpin = xfs_qm_qoff_logitem_unpin, 423 .iop_unlock = xfs_qm_qoff_logitem_unlock, 424 .iop_committed = xfs_qm_qoffend_logitem_committed, 425 .iop_push = xfs_qm_qoff_logitem_push, 426 .iop_committing = xfs_qm_qoff_logitem_committing 427 }; 428 429 /* 430 * This is the ops vector shared by all quotaoff-start log items. 431 */ 432 static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = { 433 .iop_size = xfs_qm_qoff_logitem_size, 434 .iop_format = xfs_qm_qoff_logitem_format, 435 .iop_pin = xfs_qm_qoff_logitem_pin, 436 .iop_unpin = xfs_qm_qoff_logitem_unpin, 437 .iop_unlock = xfs_qm_qoff_logitem_unlock, 438 .iop_committed = xfs_qm_qoff_logitem_committed, 439 .iop_push = xfs_qm_qoff_logitem_push, 440 .iop_committing = xfs_qm_qoff_logitem_committing 441 }; 442 443 /* 444 * Allocate and initialize an quotaoff item of the correct quota type(s). 445 */ 446 struct xfs_qoff_logitem * 447 xfs_qm_qoff_logitem_init( 448 struct xfs_mount *mp, 449 struct xfs_qoff_logitem *start, 450 uint flags) 451 { 452 struct xfs_qoff_logitem *qf; 453 454 qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), KM_SLEEP); 455 456 xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ? 457 &xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops); 458 qf->qql_item.li_mountp = mp; 459 qf->qql_format.qf_type = XFS_LI_QUOTAOFF; 460 qf->qql_format.qf_flags = flags; 461 qf->qql_start_lip = start; 462 return qf; 463 } 464