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 struct xfs_dquot *dqp; 154 155 dqp = DQUOT_ITEM(lip)->qli_dquot; 156 ASSERT(!completion_done(&dqp->q_flush)); 157 xfs_set_li_failed(lip, bp); 158 } 159 160 STATIC uint 161 xfs_qm_dquot_logitem_push( 162 struct xfs_log_item *lip, 163 struct list_head *buffer_list) __releases(&lip->li_ailp->xa_lock) 164 __acquires(&lip->li_ailp->xa_lock) 165 { 166 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot; 167 struct xfs_buf *bp = lip->li_buf; 168 uint rval = XFS_ITEM_SUCCESS; 169 int error; 170 171 if (atomic_read(&dqp->q_pincount) > 0) 172 return XFS_ITEM_PINNED; 173 174 /* 175 * The buffer containing this item failed to be written back 176 * previously. Resubmit the buffer for IO 177 */ 178 if (lip->li_flags & XFS_LI_FAILED) { 179 if (!xfs_buf_trylock(bp)) 180 return XFS_ITEM_LOCKED; 181 182 if (!xfs_buf_resubmit_failed_buffers(bp, lip, buffer_list)) 183 rval = XFS_ITEM_FLUSHING; 184 185 xfs_buf_unlock(bp); 186 return rval; 187 } 188 189 if (!xfs_dqlock_nowait(dqp)) 190 return XFS_ITEM_LOCKED; 191 192 /* 193 * Re-check the pincount now that we stabilized the value by 194 * taking the quota lock. 195 */ 196 if (atomic_read(&dqp->q_pincount) > 0) { 197 rval = XFS_ITEM_PINNED; 198 goto out_unlock; 199 } 200 201 /* 202 * Someone else is already flushing the dquot. Nothing we can do 203 * here but wait for the flush to finish and remove the item from 204 * the AIL. 205 */ 206 if (!xfs_dqflock_nowait(dqp)) { 207 rval = XFS_ITEM_FLUSHING; 208 goto out_unlock; 209 } 210 211 spin_unlock(&lip->li_ailp->xa_lock); 212 213 error = xfs_qm_dqflush(dqp, &bp); 214 if (error) { 215 xfs_warn(dqp->q_mount, "%s: push error %d on dqp %p", 216 __func__, error, dqp); 217 } else { 218 if (!xfs_buf_delwri_queue(bp, buffer_list)) 219 rval = XFS_ITEM_FLUSHING; 220 xfs_buf_relse(bp); 221 } 222 223 spin_lock(&lip->li_ailp->xa_lock); 224 out_unlock: 225 xfs_dqunlock(dqp); 226 return rval; 227 } 228 229 /* 230 * Unlock the dquot associated with the log item. 231 * Clear the fields of the dquot and dquot log item that 232 * are specific to the current transaction. If the 233 * hold flags is set, do not unlock the dquot. 234 */ 235 STATIC void 236 xfs_qm_dquot_logitem_unlock( 237 struct xfs_log_item *lip) 238 { 239 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot; 240 241 ASSERT(XFS_DQ_IS_LOCKED(dqp)); 242 243 /* 244 * Clear the transaction pointer in the dquot 245 */ 246 dqp->q_transp = NULL; 247 248 /* 249 * dquots are never 'held' from getting unlocked at the end of 250 * a transaction. Their locking and unlocking is hidden inside the 251 * transaction layer, within trans_commit. Hence, no LI_HOLD flag 252 * for the logitem. 253 */ 254 xfs_dqunlock(dqp); 255 } 256 257 /* 258 * this needs to stamp an lsn into the dquot, I think. 259 * rpc's that look at user dquot's would then have to 260 * push on the dependency recorded in the dquot 261 */ 262 STATIC void 263 xfs_qm_dquot_logitem_committing( 264 struct xfs_log_item *lip, 265 xfs_lsn_t lsn) 266 { 267 } 268 269 /* 270 * This is the ops vector for dquots 271 */ 272 static const struct xfs_item_ops xfs_dquot_item_ops = { 273 .iop_size = xfs_qm_dquot_logitem_size, 274 .iop_format = xfs_qm_dquot_logitem_format, 275 .iop_pin = xfs_qm_dquot_logitem_pin, 276 .iop_unpin = xfs_qm_dquot_logitem_unpin, 277 .iop_unlock = xfs_qm_dquot_logitem_unlock, 278 .iop_committed = xfs_qm_dquot_logitem_committed, 279 .iop_push = xfs_qm_dquot_logitem_push, 280 .iop_committing = xfs_qm_dquot_logitem_committing, 281 .iop_error = xfs_dquot_item_error 282 }; 283 284 /* 285 * Initialize the dquot log item for a newly allocated dquot. 286 * The dquot isn't locked at this point, but it isn't on any of the lists 287 * either, so we don't care. 288 */ 289 void 290 xfs_qm_dquot_logitem_init( 291 struct xfs_dquot *dqp) 292 { 293 struct xfs_dq_logitem *lp = &dqp->q_logitem; 294 295 xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT, 296 &xfs_dquot_item_ops); 297 lp->qli_dquot = dqp; 298 } 299 300 /*------------------ QUOTAOFF LOG ITEMS -------------------*/ 301 302 static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip) 303 { 304 return container_of(lip, struct xfs_qoff_logitem, qql_item); 305 } 306 307 308 /* 309 * This returns the number of iovecs needed to log the given quotaoff item. 310 * We only need 1 iovec for an quotaoff item. It just logs the 311 * quotaoff_log_format structure. 312 */ 313 STATIC void 314 xfs_qm_qoff_logitem_size( 315 struct xfs_log_item *lip, 316 int *nvecs, 317 int *nbytes) 318 { 319 *nvecs += 1; 320 *nbytes += sizeof(struct xfs_qoff_logitem); 321 } 322 323 STATIC void 324 xfs_qm_qoff_logitem_format( 325 struct xfs_log_item *lip, 326 struct xfs_log_vec *lv) 327 { 328 struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip); 329 struct xfs_log_iovec *vecp = NULL; 330 struct xfs_qoff_logformat *qlf; 331 332 qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QUOTAOFF); 333 qlf->qf_type = XFS_LI_QUOTAOFF; 334 qlf->qf_size = 1; 335 qlf->qf_flags = qflip->qql_flags; 336 xlog_finish_iovec(lv, vecp, sizeof(struct xfs_qoff_logitem)); 337 } 338 339 /* 340 * Pinning has no meaning for an quotaoff item, so just return. 341 */ 342 STATIC void 343 xfs_qm_qoff_logitem_pin( 344 struct xfs_log_item *lip) 345 { 346 } 347 348 /* 349 * Since pinning has no meaning for an quotaoff item, unpinning does 350 * not either. 351 */ 352 STATIC void 353 xfs_qm_qoff_logitem_unpin( 354 struct xfs_log_item *lip, 355 int remove) 356 { 357 } 358 359 /* 360 * There isn't much you can do to push a quotaoff item. It is simply 361 * stuck waiting for the log to be flushed to disk. 362 */ 363 STATIC uint 364 xfs_qm_qoff_logitem_push( 365 struct xfs_log_item *lip, 366 struct list_head *buffer_list) 367 { 368 return XFS_ITEM_LOCKED; 369 } 370 371 /* 372 * Quotaoff items have no locking or pushing, so return failure 373 * so that the caller doesn't bother with us. 374 */ 375 STATIC void 376 xfs_qm_qoff_logitem_unlock( 377 struct xfs_log_item *lip) 378 { 379 } 380 381 /* 382 * The quotaoff-start-item is logged only once and cannot be moved in the log, 383 * so simply return the lsn at which it's been logged. 384 */ 385 STATIC xfs_lsn_t 386 xfs_qm_qoff_logitem_committed( 387 struct xfs_log_item *lip, 388 xfs_lsn_t lsn) 389 { 390 return lsn; 391 } 392 393 STATIC xfs_lsn_t 394 xfs_qm_qoffend_logitem_committed( 395 struct xfs_log_item *lip, 396 xfs_lsn_t lsn) 397 { 398 struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip); 399 struct xfs_qoff_logitem *qfs = qfe->qql_start_lip; 400 struct xfs_ail *ailp = qfs->qql_item.li_ailp; 401 402 /* 403 * Delete the qoff-start logitem from the AIL. 404 * xfs_trans_ail_delete() drops the AIL lock. 405 */ 406 spin_lock(&ailp->xa_lock); 407 xfs_trans_ail_delete(ailp, &qfs->qql_item, SHUTDOWN_LOG_IO_ERROR); 408 409 kmem_free(qfs->qql_item.li_lv_shadow); 410 kmem_free(lip->li_lv_shadow); 411 kmem_free(qfs); 412 kmem_free(qfe); 413 return (xfs_lsn_t)-1; 414 } 415 416 /* 417 * XXX rcc - don't know quite what to do with this. I think we can 418 * just ignore it. The only time that isn't the case is if we allow 419 * the client to somehow see that quotas have been turned off in which 420 * we can't allow that to get back until the quotaoff hits the disk. 421 * So how would that happen? Also, do we need different routines for 422 * quotaoff start and quotaoff end? I suspect the answer is yes but 423 * to be sure, I need to look at the recovery code and see how quota off 424 * recovery is handled (do we roll forward or back or do something else). 425 * If we roll forwards or backwards, then we need two separate routines, 426 * one that does nothing and one that stamps in the lsn that matters 427 * (truly makes the quotaoff irrevocable). If we do something else, 428 * then maybe we don't need two. 429 */ 430 STATIC void 431 xfs_qm_qoff_logitem_committing( 432 struct xfs_log_item *lip, 433 xfs_lsn_t commit_lsn) 434 { 435 } 436 437 static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = { 438 .iop_size = xfs_qm_qoff_logitem_size, 439 .iop_format = xfs_qm_qoff_logitem_format, 440 .iop_pin = xfs_qm_qoff_logitem_pin, 441 .iop_unpin = xfs_qm_qoff_logitem_unpin, 442 .iop_unlock = xfs_qm_qoff_logitem_unlock, 443 .iop_committed = xfs_qm_qoffend_logitem_committed, 444 .iop_push = xfs_qm_qoff_logitem_push, 445 .iop_committing = xfs_qm_qoff_logitem_committing 446 }; 447 448 /* 449 * This is the ops vector shared by all quotaoff-start log items. 450 */ 451 static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = { 452 .iop_size = xfs_qm_qoff_logitem_size, 453 .iop_format = xfs_qm_qoff_logitem_format, 454 .iop_pin = xfs_qm_qoff_logitem_pin, 455 .iop_unpin = xfs_qm_qoff_logitem_unpin, 456 .iop_unlock = xfs_qm_qoff_logitem_unlock, 457 .iop_committed = xfs_qm_qoff_logitem_committed, 458 .iop_push = xfs_qm_qoff_logitem_push, 459 .iop_committing = xfs_qm_qoff_logitem_committing 460 }; 461 462 /* 463 * Allocate and initialize an quotaoff item of the correct quota type(s). 464 */ 465 struct xfs_qoff_logitem * 466 xfs_qm_qoff_logitem_init( 467 struct xfs_mount *mp, 468 struct xfs_qoff_logitem *start, 469 uint flags) 470 { 471 struct xfs_qoff_logitem *qf; 472 473 qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), KM_SLEEP); 474 475 xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ? 476 &xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops); 477 qf->qql_item.li_mountp = mp; 478 qf->qql_start_lip = start; 479 qf->qql_flags = flags; 480 return qf; 481 } 482