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