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) __releases(&lip->li_ailp->xa_lock) 146 __acquires(&lip->li_ailp->xa_lock) 147 { 148 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot; 149 struct xfs_buf *bp = NULL; 150 uint rval = XFS_ITEM_SUCCESS; 151 int error; 152 153 if (atomic_read(&dqp->q_pincount) > 0) 154 return XFS_ITEM_PINNED; 155 156 if (!xfs_dqlock_nowait(dqp)) 157 return XFS_ITEM_LOCKED; 158 159 /* 160 * Re-check the pincount now that we stabilized the value by 161 * taking the quota lock. 162 */ 163 if (atomic_read(&dqp->q_pincount) > 0) { 164 rval = XFS_ITEM_PINNED; 165 goto out_unlock; 166 } 167 168 /* 169 * Someone else is already flushing the dquot. Nothing we can do 170 * here but wait for the flush to finish and remove the item from 171 * the AIL. 172 */ 173 if (!xfs_dqflock_nowait(dqp)) { 174 rval = XFS_ITEM_FLUSHING; 175 goto out_unlock; 176 } 177 178 spin_unlock(&lip->li_ailp->xa_lock); 179 180 error = xfs_qm_dqflush(dqp, &bp); 181 if (error) { 182 xfs_warn(dqp->q_mount, "%s: push error %d on dqp %p", 183 __func__, error, dqp); 184 } else { 185 if (!xfs_buf_delwri_queue(bp, buffer_list)) 186 rval = XFS_ITEM_FLUSHING; 187 xfs_buf_relse(bp); 188 } 189 190 spin_lock(&lip->li_ailp->xa_lock); 191 out_unlock: 192 xfs_dqunlock(dqp); 193 return rval; 194 } 195 196 /* 197 * Unlock the dquot associated with the log item. 198 * Clear the fields of the dquot and dquot log item that 199 * are specific to the current transaction. If the 200 * hold flags is set, do not unlock the dquot. 201 */ 202 STATIC void 203 xfs_qm_dquot_logitem_unlock( 204 struct xfs_log_item *lip) 205 { 206 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot; 207 208 ASSERT(XFS_DQ_IS_LOCKED(dqp)); 209 210 /* 211 * Clear the transaction pointer in the dquot 212 */ 213 dqp->q_transp = NULL; 214 215 /* 216 * dquots are never 'held' from getting unlocked at the end of 217 * a transaction. Their locking and unlocking is hidden inside the 218 * transaction layer, within trans_commit. Hence, no LI_HOLD flag 219 * for the logitem. 220 */ 221 xfs_dqunlock(dqp); 222 } 223 224 /* 225 * this needs to stamp an lsn into the dquot, I think. 226 * rpc's that look at user dquot's would then have to 227 * push on the dependency recorded in the dquot 228 */ 229 STATIC void 230 xfs_qm_dquot_logitem_committing( 231 struct xfs_log_item *lip, 232 xfs_lsn_t lsn) 233 { 234 } 235 236 /* 237 * This is the ops vector for dquots 238 */ 239 static const struct xfs_item_ops xfs_dquot_item_ops = { 240 .iop_size = xfs_qm_dquot_logitem_size, 241 .iop_format = xfs_qm_dquot_logitem_format, 242 .iop_pin = xfs_qm_dquot_logitem_pin, 243 .iop_unpin = xfs_qm_dquot_logitem_unpin, 244 .iop_unlock = xfs_qm_dquot_logitem_unlock, 245 .iop_committed = xfs_qm_dquot_logitem_committed, 246 .iop_push = xfs_qm_dquot_logitem_push, 247 .iop_committing = xfs_qm_dquot_logitem_committing 248 }; 249 250 /* 251 * Initialize the dquot log item for a newly allocated dquot. 252 * The dquot isn't locked at this point, but it isn't on any of the lists 253 * either, so we don't care. 254 */ 255 void 256 xfs_qm_dquot_logitem_init( 257 struct xfs_dquot *dqp) 258 { 259 struct xfs_dq_logitem *lp = &dqp->q_logitem; 260 261 xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT, 262 &xfs_dquot_item_ops); 263 lp->qli_dquot = dqp; 264 lp->qli_format.qlf_type = XFS_LI_DQUOT; 265 lp->qli_format.qlf_id = be32_to_cpu(dqp->q_core.d_id); 266 lp->qli_format.qlf_blkno = dqp->q_blkno; 267 lp->qli_format.qlf_len = 1; 268 /* 269 * This is just the offset of this dquot within its buffer 270 * (which is currently 1 FSB and probably won't change). 271 * Hence 32 bits for this offset should be just fine. 272 * Alternatively, we can store (bufoffset / sizeof(xfs_dqblk_t)) 273 * here, and recompute it at recovery time. 274 */ 275 lp->qli_format.qlf_boffset = (__uint32_t)dqp->q_bufoffset; 276 } 277 278 /*------------------ QUOTAOFF LOG ITEMS -------------------*/ 279 280 static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip) 281 { 282 return container_of(lip, struct xfs_qoff_logitem, qql_item); 283 } 284 285 286 /* 287 * This returns the number of iovecs needed to log the given quotaoff item. 288 * We only need 1 iovec for an quotaoff item. It just logs the 289 * quotaoff_log_format structure. 290 */ 291 STATIC void 292 xfs_qm_qoff_logitem_size( 293 struct xfs_log_item *lip, 294 int *nvecs, 295 int *nbytes) 296 { 297 *nvecs += 1; 298 *nbytes += sizeof(struct xfs_qoff_logitem); 299 } 300 301 /* 302 * This is called to fill in the vector of log iovecs for the 303 * given quotaoff log item. We use only 1 iovec, and we point that 304 * at the quotaoff_log_format structure embedded in the quotaoff item. 305 * It is at this point that we assert that all of the extent 306 * slots in the quotaoff item have been filled. 307 */ 308 STATIC void 309 xfs_qm_qoff_logitem_format( 310 struct xfs_log_item *lip, 311 struct xfs_log_iovec *log_vector) 312 { 313 struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip); 314 315 ASSERT(qflip->qql_format.qf_type == XFS_LI_QUOTAOFF); 316 317 log_vector->i_addr = &qflip->qql_format; 318 log_vector->i_len = sizeof(xfs_qoff_logitem_t); 319 log_vector->i_type = XLOG_REG_TYPE_QUOTAOFF; 320 qflip->qql_format.qf_size = 1; 321 } 322 323 /* 324 * Pinning has no meaning for an quotaoff item, so just return. 325 */ 326 STATIC void 327 xfs_qm_qoff_logitem_pin( 328 struct xfs_log_item *lip) 329 { 330 } 331 332 /* 333 * Since pinning has no meaning for an quotaoff item, unpinning does 334 * not either. 335 */ 336 STATIC void 337 xfs_qm_qoff_logitem_unpin( 338 struct xfs_log_item *lip, 339 int remove) 340 { 341 } 342 343 /* 344 * There isn't much you can do to push a quotaoff item. It is simply 345 * stuck waiting for the log to be flushed to disk. 346 */ 347 STATIC uint 348 xfs_qm_qoff_logitem_push( 349 struct xfs_log_item *lip, 350 struct list_head *buffer_list) 351 { 352 return XFS_ITEM_LOCKED; 353 } 354 355 /* 356 * Quotaoff items have no locking or pushing, so return failure 357 * so that the caller doesn't bother with us. 358 */ 359 STATIC void 360 xfs_qm_qoff_logitem_unlock( 361 struct xfs_log_item *lip) 362 { 363 } 364 365 /* 366 * The quotaoff-start-item is logged only once and cannot be moved in the log, 367 * so simply return the lsn at which it's been logged. 368 */ 369 STATIC xfs_lsn_t 370 xfs_qm_qoff_logitem_committed( 371 struct xfs_log_item *lip, 372 xfs_lsn_t lsn) 373 { 374 return lsn; 375 } 376 377 STATIC xfs_lsn_t 378 xfs_qm_qoffend_logitem_committed( 379 struct xfs_log_item *lip, 380 xfs_lsn_t lsn) 381 { 382 struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip); 383 struct xfs_qoff_logitem *qfs = qfe->qql_start_lip; 384 struct xfs_ail *ailp = qfs->qql_item.li_ailp; 385 386 /* 387 * Delete the qoff-start logitem from the AIL. 388 * xfs_trans_ail_delete() drops the AIL lock. 389 */ 390 spin_lock(&ailp->xa_lock); 391 xfs_trans_ail_delete(ailp, &qfs->qql_item, SHUTDOWN_LOG_IO_ERROR); 392 393 kmem_free(qfs); 394 kmem_free(qfe); 395 return (xfs_lsn_t)-1; 396 } 397 398 /* 399 * XXX rcc - don't know quite what to do with this. I think we can 400 * just ignore it. The only time that isn't the case is if we allow 401 * the client to somehow see that quotas have been turned off in which 402 * we can't allow that to get back until the quotaoff hits the disk. 403 * So how would that happen? Also, do we need different routines for 404 * quotaoff start and quotaoff end? I suspect the answer is yes but 405 * to be sure, I need to look at the recovery code and see how quota off 406 * recovery is handled (do we roll forward or back or do something else). 407 * If we roll forwards or backwards, then we need two separate routines, 408 * one that does nothing and one that stamps in the lsn that matters 409 * (truly makes the quotaoff irrevocable). If we do something else, 410 * then maybe we don't need two. 411 */ 412 STATIC void 413 xfs_qm_qoff_logitem_committing( 414 struct xfs_log_item *lip, 415 xfs_lsn_t commit_lsn) 416 { 417 } 418 419 static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = { 420 .iop_size = xfs_qm_qoff_logitem_size, 421 .iop_format = xfs_qm_qoff_logitem_format, 422 .iop_pin = xfs_qm_qoff_logitem_pin, 423 .iop_unpin = xfs_qm_qoff_logitem_unpin, 424 .iop_unlock = xfs_qm_qoff_logitem_unlock, 425 .iop_committed = xfs_qm_qoffend_logitem_committed, 426 .iop_push = xfs_qm_qoff_logitem_push, 427 .iop_committing = xfs_qm_qoff_logitem_committing 428 }; 429 430 /* 431 * This is the ops vector shared by all quotaoff-start log items. 432 */ 433 static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = { 434 .iop_size = xfs_qm_qoff_logitem_size, 435 .iop_format = xfs_qm_qoff_logitem_format, 436 .iop_pin = xfs_qm_qoff_logitem_pin, 437 .iop_unpin = xfs_qm_qoff_logitem_unpin, 438 .iop_unlock = xfs_qm_qoff_logitem_unlock, 439 .iop_committed = xfs_qm_qoff_logitem_committed, 440 .iop_push = xfs_qm_qoff_logitem_push, 441 .iop_committing = xfs_qm_qoff_logitem_committing 442 }; 443 444 /* 445 * Allocate and initialize an quotaoff item of the correct quota type(s). 446 */ 447 struct xfs_qoff_logitem * 448 xfs_qm_qoff_logitem_init( 449 struct xfs_mount *mp, 450 struct xfs_qoff_logitem *start, 451 uint flags) 452 { 453 struct xfs_qoff_logitem *qf; 454 455 qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), KM_SLEEP); 456 457 xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ? 458 &xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops); 459 qf->qql_item.li_mountp = mp; 460 qf->qql_format.qf_type = XFS_LI_QUOTAOFF; 461 qf->qql_format.qf_flags = flags; 462 qf->qql_start_lip = start; 463 return qf; 464 } 465