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