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_format.h" 22 #include "xfs_trans_resv.h" 23 #include "xfs_mount.h" 24 #include "xfs_inode.h" 25 #include "xfs_quota.h" 26 #include "xfs_error.h" 27 #include "xfs_trans.h" 28 #include "xfs_buf_item.h" 29 #include "xfs_trans_priv.h" 30 #include "xfs_qm.h" 31 #include "xfs_log.h" 32 33 static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip) 34 { 35 return container_of(lip, struct xfs_dq_logitem, qli_item); 36 } 37 38 /* 39 * returns the number of iovecs needed to log the given dquot item. 40 */ 41 STATIC void 42 xfs_qm_dquot_logitem_size( 43 struct xfs_log_item *lip, 44 int *nvecs, 45 int *nbytes) 46 { 47 *nvecs += 2; 48 *nbytes += sizeof(struct xfs_dq_logformat) + 49 sizeof(struct xfs_disk_dquot); 50 } 51 52 /* 53 * fills in the vector of log iovecs for the given dquot log item. 54 */ 55 STATIC void 56 xfs_qm_dquot_logitem_format( 57 struct xfs_log_item *lip, 58 struct xfs_log_vec *lv) 59 { 60 struct xfs_dq_logitem *qlip = DQUOT_ITEM(lip); 61 struct xfs_log_iovec *vecp = NULL; 62 struct xfs_dq_logformat *qlf; 63 64 qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QFORMAT); 65 qlf->qlf_type = XFS_LI_DQUOT; 66 qlf->qlf_size = 2; 67 qlf->qlf_id = be32_to_cpu(qlip->qli_dquot->q_core.d_id); 68 qlf->qlf_blkno = qlip->qli_dquot->q_blkno; 69 qlf->qlf_len = 1; 70 qlf->qlf_boffset = qlip->qli_dquot->q_bufoffset; 71 xlog_finish_iovec(lv, vecp, sizeof(struct xfs_dq_logformat)); 72 73 xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_DQUOT, 74 &qlip->qli_dquot->q_core, 75 sizeof(struct xfs_disk_dquot)); 76 } 77 78 /* 79 * Increment the pin count of the given dquot. 80 */ 81 STATIC void 82 xfs_qm_dquot_logitem_pin( 83 struct xfs_log_item *lip) 84 { 85 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot; 86 87 ASSERT(XFS_DQ_IS_LOCKED(dqp)); 88 atomic_inc(&dqp->q_pincount); 89 } 90 91 /* 92 * Decrement the pin count of the given dquot, and wake up 93 * anyone in xfs_dqwait_unpin() if the count goes to 0. The 94 * dquot must have been previously pinned with a call to 95 * xfs_qm_dquot_logitem_pin(). 96 */ 97 STATIC void 98 xfs_qm_dquot_logitem_unpin( 99 struct xfs_log_item *lip, 100 int remove) 101 { 102 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot; 103 104 ASSERT(atomic_read(&dqp->q_pincount) > 0); 105 if (atomic_dec_and_test(&dqp->q_pincount)) 106 wake_up(&dqp->q_pinwait); 107 } 108 109 STATIC xfs_lsn_t 110 xfs_qm_dquot_logitem_committed( 111 struct xfs_log_item *lip, 112 xfs_lsn_t lsn) 113 { 114 /* 115 * We always re-log the entire dquot when it becomes dirty, 116 * so, the latest copy _is_ the only one that matters. 117 */ 118 return lsn; 119 } 120 121 /* 122 * This is called to wait for the given dquot to be unpinned. 123 * Most of these pin/unpin routines are plagiarized from inode code. 124 */ 125 void 126 xfs_qm_dqunpin_wait( 127 struct xfs_dquot *dqp) 128 { 129 ASSERT(XFS_DQ_IS_LOCKED(dqp)); 130 if (atomic_read(&dqp->q_pincount) == 0) 131 return; 132 133 /* 134 * Give the log a push so we don't wait here too long. 135 */ 136 xfs_log_force(dqp->q_mount, 0); 137 wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0)); 138 } 139 140 /* 141 * Callback used to mark a buffer with XFS_LI_FAILED when items in the buffer 142 * have been failed during writeback 143 * 144 * this informs the AIL that the dquot is already flush locked on the next push, 145 * and acquires a hold on the buffer to ensure that it isn't reclaimed before 146 * dirty data makes it to disk. 147 */ 148 STATIC void 149 xfs_dquot_item_error( 150 struct xfs_log_item *lip, 151 struct xfs_buf *bp) 152 { 153 ASSERT(!completion_done(&DQUOT_ITEM(lip)->qli_dquot->q_flush)); 154 xfs_set_li_failed(lip, bp); 155 } 156 157 STATIC uint 158 xfs_qm_dquot_logitem_push( 159 struct xfs_log_item *lip, 160 struct list_head *buffer_list) __releases(&lip->li_ailp->xa_lock) 161 __acquires(&lip->li_ailp->xa_lock) 162 { 163 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot; 164 struct xfs_buf *bp = lip->li_buf; 165 uint rval = XFS_ITEM_SUCCESS; 166 int error; 167 168 if (atomic_read(&dqp->q_pincount) > 0) 169 return XFS_ITEM_PINNED; 170 171 /* 172 * The buffer containing this item failed to be written back 173 * previously. Resubmit the buffer for IO 174 */ 175 if (lip->li_flags & XFS_LI_FAILED) { 176 if (!xfs_buf_trylock(bp)) 177 return XFS_ITEM_LOCKED; 178 179 if (!xfs_buf_resubmit_failed_buffers(bp, buffer_list)) 180 rval = XFS_ITEM_FLUSHING; 181 182 xfs_buf_unlock(bp); 183 return rval; 184 } 185 186 if (!xfs_dqlock_nowait(dqp)) 187 return XFS_ITEM_LOCKED; 188 189 /* 190 * Re-check the pincount now that we stabilized the value by 191 * taking the quota lock. 192 */ 193 if (atomic_read(&dqp->q_pincount) > 0) { 194 rval = XFS_ITEM_PINNED; 195 goto out_unlock; 196 } 197 198 /* 199 * Someone else is already flushing the dquot. Nothing we can do 200 * here but wait for the flush to finish and remove the item from 201 * the AIL. 202 */ 203 if (!xfs_dqflock_nowait(dqp)) { 204 rval = XFS_ITEM_FLUSHING; 205 goto out_unlock; 206 } 207 208 spin_unlock(&lip->li_ailp->xa_lock); 209 210 error = xfs_qm_dqflush(dqp, &bp); 211 if (error) { 212 xfs_warn(dqp->q_mount, "%s: push error %d on dqp "PTR_FMT, 213 __func__, error, dqp); 214 } else { 215 if (!xfs_buf_delwri_queue(bp, buffer_list)) 216 rval = XFS_ITEM_FLUSHING; 217 xfs_buf_relse(bp); 218 } 219 220 spin_lock(&lip->li_ailp->xa_lock); 221 out_unlock: 222 xfs_dqunlock(dqp); 223 return rval; 224 } 225 226 /* 227 * Unlock the dquot associated with the log item. 228 * Clear the fields of the dquot and dquot log item that 229 * are specific to the current transaction. If the 230 * hold flags is set, do not unlock the dquot. 231 */ 232 STATIC void 233 xfs_qm_dquot_logitem_unlock( 234 struct xfs_log_item *lip) 235 { 236 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot; 237 238 ASSERT(XFS_DQ_IS_LOCKED(dqp)); 239 240 /* 241 * Clear the transaction pointer in the dquot 242 */ 243 dqp->q_transp = NULL; 244 245 /* 246 * dquots are never 'held' from getting unlocked at the end of 247 * a transaction. Their locking and unlocking is hidden inside the 248 * transaction layer, within trans_commit. Hence, no LI_HOLD flag 249 * for the logitem. 250 */ 251 xfs_dqunlock(dqp); 252 } 253 254 /* 255 * this needs to stamp an lsn into the dquot, I think. 256 * rpc's that look at user dquot's would then have to 257 * push on the dependency recorded in the dquot 258 */ 259 STATIC void 260 xfs_qm_dquot_logitem_committing( 261 struct xfs_log_item *lip, 262 xfs_lsn_t lsn) 263 { 264 } 265 266 /* 267 * This is the ops vector for dquots 268 */ 269 static const struct xfs_item_ops xfs_dquot_item_ops = { 270 .iop_size = xfs_qm_dquot_logitem_size, 271 .iop_format = xfs_qm_dquot_logitem_format, 272 .iop_pin = xfs_qm_dquot_logitem_pin, 273 .iop_unpin = xfs_qm_dquot_logitem_unpin, 274 .iop_unlock = xfs_qm_dquot_logitem_unlock, 275 .iop_committed = xfs_qm_dquot_logitem_committed, 276 .iop_push = xfs_qm_dquot_logitem_push, 277 .iop_committing = xfs_qm_dquot_logitem_committing, 278 .iop_error = xfs_dquot_item_error 279 }; 280 281 /* 282 * Initialize the dquot log item for a newly allocated dquot. 283 * The dquot isn't locked at this point, but it isn't on any of the lists 284 * either, so we don't care. 285 */ 286 void 287 xfs_qm_dquot_logitem_init( 288 struct xfs_dquot *dqp) 289 { 290 struct xfs_dq_logitem *lp = &dqp->q_logitem; 291 292 xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT, 293 &xfs_dquot_item_ops); 294 lp->qli_dquot = dqp; 295 } 296 297 /*------------------ QUOTAOFF LOG ITEMS -------------------*/ 298 299 static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip) 300 { 301 return container_of(lip, struct xfs_qoff_logitem, qql_item); 302 } 303 304 305 /* 306 * This returns the number of iovecs needed to log the given quotaoff item. 307 * We only need 1 iovec for an quotaoff item. It just logs the 308 * quotaoff_log_format structure. 309 */ 310 STATIC void 311 xfs_qm_qoff_logitem_size( 312 struct xfs_log_item *lip, 313 int *nvecs, 314 int *nbytes) 315 { 316 *nvecs += 1; 317 *nbytes += sizeof(struct xfs_qoff_logitem); 318 } 319 320 STATIC void 321 xfs_qm_qoff_logitem_format( 322 struct xfs_log_item *lip, 323 struct xfs_log_vec *lv) 324 { 325 struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip); 326 struct xfs_log_iovec *vecp = NULL; 327 struct xfs_qoff_logformat *qlf; 328 329 qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QUOTAOFF); 330 qlf->qf_type = XFS_LI_QUOTAOFF; 331 qlf->qf_size = 1; 332 qlf->qf_flags = qflip->qql_flags; 333 xlog_finish_iovec(lv, vecp, sizeof(struct xfs_qoff_logitem)); 334 } 335 336 /* 337 * Pinning has no meaning for an quotaoff item, so just return. 338 */ 339 STATIC void 340 xfs_qm_qoff_logitem_pin( 341 struct xfs_log_item *lip) 342 { 343 } 344 345 /* 346 * Since pinning has no meaning for an quotaoff item, unpinning does 347 * not either. 348 */ 349 STATIC void 350 xfs_qm_qoff_logitem_unpin( 351 struct xfs_log_item *lip, 352 int remove) 353 { 354 } 355 356 /* 357 * There isn't much you can do to push a quotaoff item. It is simply 358 * stuck waiting for the log to be flushed to disk. 359 */ 360 STATIC uint 361 xfs_qm_qoff_logitem_push( 362 struct xfs_log_item *lip, 363 struct list_head *buffer_list) 364 { 365 return XFS_ITEM_LOCKED; 366 } 367 368 /* 369 * Quotaoff items have no locking or pushing, so return failure 370 * so that the caller doesn't bother with us. 371 */ 372 STATIC void 373 xfs_qm_qoff_logitem_unlock( 374 struct xfs_log_item *lip) 375 { 376 } 377 378 /* 379 * The quotaoff-start-item is logged only once and cannot be moved in the log, 380 * so simply return the lsn at which it's been logged. 381 */ 382 STATIC xfs_lsn_t 383 xfs_qm_qoff_logitem_committed( 384 struct xfs_log_item *lip, 385 xfs_lsn_t lsn) 386 { 387 return lsn; 388 } 389 390 STATIC xfs_lsn_t 391 xfs_qm_qoffend_logitem_committed( 392 struct xfs_log_item *lip, 393 xfs_lsn_t lsn) 394 { 395 struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip); 396 struct xfs_qoff_logitem *qfs = qfe->qql_start_lip; 397 struct xfs_ail *ailp = qfs->qql_item.li_ailp; 398 399 /* 400 * Delete the qoff-start logitem from the AIL. 401 * xfs_trans_ail_delete() drops the AIL lock. 402 */ 403 spin_lock(&ailp->xa_lock); 404 xfs_trans_ail_delete(ailp, &qfs->qql_item, SHUTDOWN_LOG_IO_ERROR); 405 406 kmem_free(qfs->qql_item.li_lv_shadow); 407 kmem_free(lip->li_lv_shadow); 408 kmem_free(qfs); 409 kmem_free(qfe); 410 return (xfs_lsn_t)-1; 411 } 412 413 /* 414 * XXX rcc - don't know quite what to do with this. I think we can 415 * just ignore it. The only time that isn't the case is if we allow 416 * the client to somehow see that quotas have been turned off in which 417 * we can't allow that to get back until the quotaoff hits the disk. 418 * So how would that happen? Also, do we need different routines for 419 * quotaoff start and quotaoff end? I suspect the answer is yes but 420 * to be sure, I need to look at the recovery code and see how quota off 421 * recovery is handled (do we roll forward or back or do something else). 422 * If we roll forwards or backwards, then we need two separate routines, 423 * one that does nothing and one that stamps in the lsn that matters 424 * (truly makes the quotaoff irrevocable). If we do something else, 425 * then maybe we don't need two. 426 */ 427 STATIC void 428 xfs_qm_qoff_logitem_committing( 429 struct xfs_log_item *lip, 430 xfs_lsn_t commit_lsn) 431 { 432 } 433 434 static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = { 435 .iop_size = xfs_qm_qoff_logitem_size, 436 .iop_format = xfs_qm_qoff_logitem_format, 437 .iop_pin = xfs_qm_qoff_logitem_pin, 438 .iop_unpin = xfs_qm_qoff_logitem_unpin, 439 .iop_unlock = xfs_qm_qoff_logitem_unlock, 440 .iop_committed = xfs_qm_qoffend_logitem_committed, 441 .iop_push = xfs_qm_qoff_logitem_push, 442 .iop_committing = xfs_qm_qoff_logitem_committing 443 }; 444 445 /* 446 * This is the ops vector shared by all quotaoff-start log items. 447 */ 448 static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = { 449 .iop_size = xfs_qm_qoff_logitem_size, 450 .iop_format = xfs_qm_qoff_logitem_format, 451 .iop_pin = xfs_qm_qoff_logitem_pin, 452 .iop_unpin = xfs_qm_qoff_logitem_unpin, 453 .iop_unlock = xfs_qm_qoff_logitem_unlock, 454 .iop_committed = xfs_qm_qoff_logitem_committed, 455 .iop_push = xfs_qm_qoff_logitem_push, 456 .iop_committing = xfs_qm_qoff_logitem_committing 457 }; 458 459 /* 460 * Allocate and initialize an quotaoff item of the correct quota type(s). 461 */ 462 struct xfs_qoff_logitem * 463 xfs_qm_qoff_logitem_init( 464 struct xfs_mount *mp, 465 struct xfs_qoff_logitem *start, 466 uint flags) 467 { 468 struct xfs_qoff_logitem *qf; 469 470 qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), KM_SLEEP); 471 472 xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ? 473 &xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops); 474 qf->qql_item.li_mountp = mp; 475 qf->qql_start_lip = start; 476 qf->qql_flags = flags; 477 return qf; 478 } 479