| 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 | } |