Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of version 2 of the GNU General Public License as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it would be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 11 | * |
| 12 | * Further, this software is distributed without any warranty that it is |
| 13 | * free of the rightful claim of any third person regarding infringement |
| 14 | * or the like. Any license provided herein, whether implied or |
| 15 | * otherwise, applies only to this software file. Patent licenses, if |
| 16 | * any, provided herein do not apply to combinations of this program with |
| 17 | * other software, or any other product whatsoever. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write the Free Software Foundation, Inc., 59 |
| 21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. |
| 22 | * |
| 23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, |
| 24 | * Mountain View, CA 94043, or: |
| 25 | * |
| 26 | * http://www.sgi.com |
| 27 | * |
| 28 | * For further information regarding this notice, see: |
| 29 | * |
| 30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ |
| 31 | */ |
| 32 | |
| 33 | #include "xfs.h" |
| 34 | #include "xfs_macros.h" |
| 35 | #include "xfs_types.h" |
| 36 | #include "xfs_inum.h" |
| 37 | #include "xfs_log.h" |
| 38 | #include "xfs_trans.h" |
| 39 | #include "xfs_sb.h" |
| 40 | #include "xfs_ag.h" |
| 41 | #include "xfs_dir.h" |
| 42 | #include "xfs_dir2.h" |
| 43 | #include "xfs_dmapi.h" |
| 44 | #include "xfs_mount.h" |
| 45 | #include "xfs_error.h" |
| 46 | #include "xfs_trans_priv.h" |
| 47 | #include "xfs_alloc_btree.h" |
| 48 | #include "xfs_bmap_btree.h" |
| 49 | #include "xfs_ialloc_btree.h" |
| 50 | #include "xfs_btree.h" |
| 51 | #include "xfs_ialloc.h" |
| 52 | #include "xfs_alloc.h" |
| 53 | #include "xfs_attr_sf.h" |
| 54 | #include "xfs_dir_sf.h" |
| 55 | #include "xfs_dir2_sf.h" |
| 56 | #include "xfs_dinode.h" |
| 57 | #include "xfs_inode.h" |
| 58 | #include "xfs_bmap.h" |
| 59 | #include "xfs_da_btree.h" |
| 60 | #include "xfs_quota.h" |
| 61 | #include "xfs_trans_space.h" |
| 62 | |
| 63 | |
| 64 | STATIC void xfs_trans_apply_sb_deltas(xfs_trans_t *); |
| 65 | STATIC uint xfs_trans_count_vecs(xfs_trans_t *); |
| 66 | STATIC void xfs_trans_fill_vecs(xfs_trans_t *, xfs_log_iovec_t *); |
| 67 | STATIC void xfs_trans_uncommit(xfs_trans_t *, uint); |
| 68 | STATIC void xfs_trans_committed(xfs_trans_t *, int); |
| 69 | STATIC void xfs_trans_chunk_committed(xfs_log_item_chunk_t *, xfs_lsn_t, int); |
| 70 | STATIC void xfs_trans_free(xfs_trans_t *); |
| 71 | |
| 72 | kmem_zone_t *xfs_trans_zone; |
| 73 | |
| 74 | |
| 75 | /* |
| 76 | * Initialize the precomputed transaction reservation values |
| 77 | * in the mount structure. |
| 78 | */ |
| 79 | void |
| 80 | xfs_trans_init( |
| 81 | xfs_mount_t *mp) |
| 82 | { |
| 83 | xfs_trans_reservations_t *resp; |
| 84 | |
| 85 | resp = &(mp->m_reservations); |
| 86 | resp->tr_write = |
| 87 | (uint)(XFS_CALC_WRITE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); |
| 88 | resp->tr_itruncate = |
| 89 | (uint)(XFS_CALC_ITRUNCATE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); |
| 90 | resp->tr_rename = |
| 91 | (uint)(XFS_CALC_RENAME_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); |
| 92 | resp->tr_link = (uint)XFS_CALC_LINK_LOG_RES(mp); |
| 93 | resp->tr_remove = |
| 94 | (uint)(XFS_CALC_REMOVE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); |
| 95 | resp->tr_symlink = |
| 96 | (uint)(XFS_CALC_SYMLINK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); |
| 97 | resp->tr_create = |
| 98 | (uint)(XFS_CALC_CREATE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); |
| 99 | resp->tr_mkdir = |
| 100 | (uint)(XFS_CALC_MKDIR_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); |
| 101 | resp->tr_ifree = |
| 102 | (uint)(XFS_CALC_IFREE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); |
| 103 | resp->tr_ichange = |
| 104 | (uint)(XFS_CALC_ICHANGE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); |
| 105 | resp->tr_growdata = (uint)XFS_CALC_GROWDATA_LOG_RES(mp); |
| 106 | resp->tr_swrite = (uint)XFS_CALC_SWRITE_LOG_RES(mp); |
| 107 | resp->tr_writeid = (uint)XFS_CALC_WRITEID_LOG_RES(mp); |
| 108 | resp->tr_addafork = |
| 109 | (uint)(XFS_CALC_ADDAFORK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); |
| 110 | resp->tr_attrinval = (uint)XFS_CALC_ATTRINVAL_LOG_RES(mp); |
| 111 | resp->tr_attrset = |
| 112 | (uint)(XFS_CALC_ATTRSET_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); |
| 113 | resp->tr_attrrm = |
| 114 | (uint)(XFS_CALC_ATTRRM_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); |
| 115 | resp->tr_clearagi = (uint)XFS_CALC_CLEAR_AGI_BUCKET_LOG_RES(mp); |
| 116 | resp->tr_growrtalloc = (uint)XFS_CALC_GROWRTALLOC_LOG_RES(mp); |
| 117 | resp->tr_growrtzero = (uint)XFS_CALC_GROWRTZERO_LOG_RES(mp); |
| 118 | resp->tr_growrtfree = (uint)XFS_CALC_GROWRTFREE_LOG_RES(mp); |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * This routine is called to allocate a transaction structure. |
| 123 | * The type parameter indicates the type of the transaction. These |
| 124 | * are enumerated in xfs_trans.h. |
| 125 | * |
| 126 | * Dynamically allocate the transaction structure from the transaction |
| 127 | * zone, initialize it, and return it to the caller. |
| 128 | */ |
| 129 | xfs_trans_t * |
| 130 | xfs_trans_alloc( |
| 131 | xfs_mount_t *mp, |
| 132 | uint type) |
| 133 | { |
| 134 | fs_check_frozen(XFS_MTOVFS(mp), SB_FREEZE_TRANS); |
| 135 | atomic_inc(&mp->m_active_trans); |
| 136 | |
| 137 | return (_xfs_trans_alloc(mp, type)); |
| 138 | |
| 139 | } |
| 140 | |
| 141 | xfs_trans_t * |
| 142 | _xfs_trans_alloc( |
| 143 | xfs_mount_t *mp, |
| 144 | uint type) |
| 145 | { |
| 146 | xfs_trans_t *tp; |
| 147 | |
| 148 | ASSERT(xfs_trans_zone != NULL); |
| 149 | tp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP); |
| 150 | |
| 151 | /* |
| 152 | * Initialize the transaction structure. |
| 153 | */ |
| 154 | tp->t_magic = XFS_TRANS_MAGIC; |
| 155 | tp->t_type = type; |
| 156 | tp->t_mountp = mp; |
| 157 | tp->t_items_free = XFS_LIC_NUM_SLOTS; |
| 158 | tp->t_busy_free = XFS_LBC_NUM_SLOTS; |
| 159 | XFS_LIC_INIT(&(tp->t_items)); |
| 160 | XFS_LBC_INIT(&(tp->t_busy)); |
| 161 | |
| 162 | return (tp); |
| 163 | } |
| 164 | |
| 165 | /* |
| 166 | * This is called to create a new transaction which will share the |
| 167 | * permanent log reservation of the given transaction. The remaining |
| 168 | * unused block and rt extent reservations are also inherited. This |
| 169 | * implies that the original transaction is no longer allowed to allocate |
| 170 | * blocks. Locks and log items, however, are no inherited. They must |
| 171 | * be added to the new transaction explicitly. |
| 172 | */ |
| 173 | xfs_trans_t * |
| 174 | xfs_trans_dup( |
| 175 | xfs_trans_t *tp) |
| 176 | { |
| 177 | xfs_trans_t *ntp; |
| 178 | |
| 179 | ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP); |
| 180 | |
| 181 | /* |
| 182 | * Initialize the new transaction structure. |
| 183 | */ |
| 184 | ntp->t_magic = XFS_TRANS_MAGIC; |
| 185 | ntp->t_type = tp->t_type; |
| 186 | ntp->t_mountp = tp->t_mountp; |
| 187 | ntp->t_items_free = XFS_LIC_NUM_SLOTS; |
| 188 | ntp->t_busy_free = XFS_LBC_NUM_SLOTS; |
| 189 | XFS_LIC_INIT(&(ntp->t_items)); |
| 190 | XFS_LBC_INIT(&(ntp->t_busy)); |
| 191 | |
| 192 | ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); |
| 193 | |
| 194 | #if defined(XLOG_NOLOG) || defined(DEBUG) |
| 195 | ASSERT(!xlog_debug || tp->t_ticket != NULL); |
| 196 | #else |
| 197 | ASSERT(tp->t_ticket != NULL); |
| 198 | #endif |
| 199 | ntp->t_flags = XFS_TRANS_PERM_LOG_RES | (tp->t_flags & XFS_TRANS_RESERVE); |
| 200 | ntp->t_ticket = tp->t_ticket; |
| 201 | ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used; |
| 202 | tp->t_blk_res = tp->t_blk_res_used; |
| 203 | ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used; |
| 204 | tp->t_rtx_res = tp->t_rtx_res_used; |
| 205 | PFLAGS_DUP(&tp->t_pflags, &ntp->t_pflags); |
| 206 | |
| 207 | XFS_TRANS_DUP_DQINFO(tp->t_mountp, tp, ntp); |
| 208 | |
| 209 | atomic_inc(&tp->t_mountp->m_active_trans); |
| 210 | return ntp; |
| 211 | } |
| 212 | |
| 213 | /* |
| 214 | * This is called to reserve free disk blocks and log space for the |
| 215 | * given transaction. This must be done before allocating any resources |
| 216 | * within the transaction. |
| 217 | * |
| 218 | * This will return ENOSPC if there are not enough blocks available. |
| 219 | * It will sleep waiting for available log space. |
| 220 | * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which |
| 221 | * is used by long running transactions. If any one of the reservations |
| 222 | * fails then they will all be backed out. |
| 223 | * |
| 224 | * This does not do quota reservations. That typically is done by the |
| 225 | * caller afterwards. |
| 226 | */ |
| 227 | int |
| 228 | xfs_trans_reserve( |
| 229 | xfs_trans_t *tp, |
| 230 | uint blocks, |
| 231 | uint logspace, |
| 232 | uint rtextents, |
| 233 | uint flags, |
| 234 | uint logcount) |
| 235 | { |
| 236 | int log_flags; |
| 237 | int error; |
| 238 | int rsvd; |
| 239 | |
| 240 | error = 0; |
| 241 | rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0; |
| 242 | |
| 243 | /* Mark this thread as being in a transaction */ |
| 244 | PFLAGS_SET_FSTRANS(&tp->t_pflags); |
| 245 | |
| 246 | /* |
| 247 | * Attempt to reserve the needed disk blocks by decrementing |
| 248 | * the number needed from the number available. This will |
| 249 | * fail if the count would go below zero. |
| 250 | */ |
| 251 | if (blocks > 0) { |
| 252 | error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FDBLOCKS, |
| 253 | -blocks, rsvd); |
| 254 | if (error != 0) { |
| 255 | PFLAGS_RESTORE_FSTRANS(&tp->t_pflags); |
| 256 | return (XFS_ERROR(ENOSPC)); |
| 257 | } |
| 258 | tp->t_blk_res += blocks; |
| 259 | } |
| 260 | |
| 261 | /* |
| 262 | * Reserve the log space needed for this transaction. |
| 263 | */ |
| 264 | if (logspace > 0) { |
| 265 | ASSERT((tp->t_log_res == 0) || (tp->t_log_res == logspace)); |
| 266 | ASSERT((tp->t_log_count == 0) || |
| 267 | (tp->t_log_count == logcount)); |
| 268 | if (flags & XFS_TRANS_PERM_LOG_RES) { |
| 269 | log_flags = XFS_LOG_PERM_RESERV; |
| 270 | tp->t_flags |= XFS_TRANS_PERM_LOG_RES; |
| 271 | } else { |
| 272 | ASSERT(tp->t_ticket == NULL); |
| 273 | ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES)); |
| 274 | log_flags = 0; |
| 275 | } |
| 276 | |
| 277 | error = xfs_log_reserve(tp->t_mountp, logspace, logcount, |
| 278 | &tp->t_ticket, |
| 279 | XFS_TRANSACTION, log_flags); |
| 280 | if (error) { |
| 281 | goto undo_blocks; |
| 282 | } |
| 283 | tp->t_log_res = logspace; |
| 284 | tp->t_log_count = logcount; |
| 285 | } |
| 286 | |
| 287 | /* |
| 288 | * Attempt to reserve the needed realtime extents by decrementing |
| 289 | * the number needed from the number available. This will |
| 290 | * fail if the count would go below zero. |
| 291 | */ |
| 292 | if (rtextents > 0) { |
| 293 | error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FREXTENTS, |
| 294 | -rtextents, rsvd); |
| 295 | if (error) { |
| 296 | error = XFS_ERROR(ENOSPC); |
| 297 | goto undo_log; |
| 298 | } |
| 299 | tp->t_rtx_res += rtextents; |
| 300 | } |
| 301 | |
| 302 | return 0; |
| 303 | |
| 304 | /* |
| 305 | * Error cases jump to one of these labels to undo any |
| 306 | * reservations which have already been performed. |
| 307 | */ |
| 308 | undo_log: |
| 309 | if (logspace > 0) { |
| 310 | if (flags & XFS_TRANS_PERM_LOG_RES) { |
| 311 | log_flags = XFS_LOG_REL_PERM_RESERV; |
| 312 | } else { |
| 313 | log_flags = 0; |
| 314 | } |
| 315 | xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, log_flags); |
| 316 | tp->t_ticket = NULL; |
| 317 | tp->t_log_res = 0; |
| 318 | tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES; |
| 319 | } |
| 320 | |
| 321 | undo_blocks: |
| 322 | if (blocks > 0) { |
| 323 | (void) xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FDBLOCKS, |
| 324 | blocks, rsvd); |
| 325 | tp->t_blk_res = 0; |
| 326 | } |
| 327 | |
| 328 | PFLAGS_RESTORE_FSTRANS(&tp->t_pflags); |
| 329 | |
| 330 | return (error); |
| 331 | } |
| 332 | |
| 333 | |
| 334 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | * Record the indicated change to the given field for application |
| 336 | * to the file system's superblock when the transaction commits. |
| 337 | * For now, just store the change in the transaction structure. |
| 338 | * |
| 339 | * Mark the transaction structure to indicate that the superblock |
| 340 | * needs to be updated before committing. |
| 341 | */ |
| 342 | void |
| 343 | xfs_trans_mod_sb( |
| 344 | xfs_trans_t *tp, |
| 345 | uint field, |
| 346 | long delta) |
| 347 | { |
| 348 | |
| 349 | switch (field) { |
| 350 | case XFS_TRANS_SB_ICOUNT: |
| 351 | tp->t_icount_delta += delta; |
| 352 | break; |
| 353 | case XFS_TRANS_SB_IFREE: |
| 354 | tp->t_ifree_delta += delta; |
| 355 | break; |
| 356 | case XFS_TRANS_SB_FDBLOCKS: |
| 357 | /* |
| 358 | * Track the number of blocks allocated in the |
| 359 | * transaction. Make sure it does not exceed the |
| 360 | * number reserved. |
| 361 | */ |
| 362 | if (delta < 0) { |
| 363 | tp->t_blk_res_used += (uint)-delta; |
| 364 | ASSERT(tp->t_blk_res_used <= tp->t_blk_res); |
| 365 | } |
| 366 | tp->t_fdblocks_delta += delta; |
| 367 | break; |
| 368 | case XFS_TRANS_SB_RES_FDBLOCKS: |
| 369 | /* |
| 370 | * The allocation has already been applied to the |
| 371 | * in-core superblock's counter. This should only |
| 372 | * be applied to the on-disk superblock. |
| 373 | */ |
| 374 | ASSERT(delta < 0); |
| 375 | tp->t_res_fdblocks_delta += delta; |
| 376 | break; |
| 377 | case XFS_TRANS_SB_FREXTENTS: |
| 378 | /* |
| 379 | * Track the number of blocks allocated in the |
| 380 | * transaction. Make sure it does not exceed the |
| 381 | * number reserved. |
| 382 | */ |
| 383 | if (delta < 0) { |
| 384 | tp->t_rtx_res_used += (uint)-delta; |
| 385 | ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res); |
| 386 | } |
| 387 | tp->t_frextents_delta += delta; |
| 388 | break; |
| 389 | case XFS_TRANS_SB_RES_FREXTENTS: |
| 390 | /* |
| 391 | * The allocation has already been applied to the |
| 392 | * in-core superblocks's counter. This should only |
| 393 | * be applied to the on-disk superblock. |
| 394 | */ |
| 395 | ASSERT(delta < 0); |
| 396 | tp->t_res_frextents_delta += delta; |
| 397 | break; |
| 398 | case XFS_TRANS_SB_DBLOCKS: |
| 399 | ASSERT(delta > 0); |
| 400 | tp->t_dblocks_delta += delta; |
| 401 | break; |
| 402 | case XFS_TRANS_SB_AGCOUNT: |
| 403 | ASSERT(delta > 0); |
| 404 | tp->t_agcount_delta += delta; |
| 405 | break; |
| 406 | case XFS_TRANS_SB_IMAXPCT: |
| 407 | tp->t_imaxpct_delta += delta; |
| 408 | break; |
| 409 | case XFS_TRANS_SB_REXTSIZE: |
| 410 | tp->t_rextsize_delta += delta; |
| 411 | break; |
| 412 | case XFS_TRANS_SB_RBMBLOCKS: |
| 413 | tp->t_rbmblocks_delta += delta; |
| 414 | break; |
| 415 | case XFS_TRANS_SB_RBLOCKS: |
| 416 | tp->t_rblocks_delta += delta; |
| 417 | break; |
| 418 | case XFS_TRANS_SB_REXTENTS: |
| 419 | tp->t_rextents_delta += delta; |
| 420 | break; |
| 421 | case XFS_TRANS_SB_REXTSLOG: |
| 422 | tp->t_rextslog_delta += delta; |
| 423 | break; |
| 424 | default: |
| 425 | ASSERT(0); |
| 426 | return; |
| 427 | } |
| 428 | |
| 429 | tp->t_flags |= (XFS_TRANS_SB_DIRTY | XFS_TRANS_DIRTY); |
| 430 | } |
| 431 | |
| 432 | /* |
| 433 | * xfs_trans_apply_sb_deltas() is called from the commit code |
| 434 | * to bring the superblock buffer into the current transaction |
| 435 | * and modify it as requested by earlier calls to xfs_trans_mod_sb(). |
| 436 | * |
| 437 | * For now we just look at each field allowed to change and change |
| 438 | * it if necessary. |
| 439 | */ |
| 440 | STATIC void |
| 441 | xfs_trans_apply_sb_deltas( |
| 442 | xfs_trans_t *tp) |
| 443 | { |
| 444 | xfs_sb_t *sbp; |
| 445 | xfs_buf_t *bp; |
| 446 | int whole = 0; |
| 447 | |
| 448 | bp = xfs_trans_getsb(tp, tp->t_mountp, 0); |
| 449 | sbp = XFS_BUF_TO_SBP(bp); |
| 450 | |
| 451 | /* |
| 452 | * Check that superblock mods match the mods made to AGF counters. |
| 453 | */ |
| 454 | ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) == |
| 455 | (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta + |
| 456 | tp->t_ag_btree_delta)); |
| 457 | |
| 458 | if (tp->t_icount_delta != 0) { |
| 459 | INT_MOD(sbp->sb_icount, ARCH_CONVERT, tp->t_icount_delta); |
| 460 | } |
| 461 | if (tp->t_ifree_delta != 0) { |
| 462 | INT_MOD(sbp->sb_ifree, ARCH_CONVERT, tp->t_ifree_delta); |
| 463 | } |
| 464 | |
| 465 | if (tp->t_fdblocks_delta != 0) { |
| 466 | INT_MOD(sbp->sb_fdblocks, ARCH_CONVERT, tp->t_fdblocks_delta); |
| 467 | } |
| 468 | if (tp->t_res_fdblocks_delta != 0) { |
| 469 | INT_MOD(sbp->sb_fdblocks, ARCH_CONVERT, tp->t_res_fdblocks_delta); |
| 470 | } |
| 471 | |
| 472 | if (tp->t_frextents_delta != 0) { |
| 473 | INT_MOD(sbp->sb_frextents, ARCH_CONVERT, tp->t_frextents_delta); |
| 474 | } |
| 475 | if (tp->t_res_frextents_delta != 0) { |
| 476 | INT_MOD(sbp->sb_frextents, ARCH_CONVERT, tp->t_res_frextents_delta); |
| 477 | } |
| 478 | if (tp->t_dblocks_delta != 0) { |
| 479 | INT_MOD(sbp->sb_dblocks, ARCH_CONVERT, tp->t_dblocks_delta); |
| 480 | whole = 1; |
| 481 | } |
| 482 | if (tp->t_agcount_delta != 0) { |
| 483 | INT_MOD(sbp->sb_agcount, ARCH_CONVERT, tp->t_agcount_delta); |
| 484 | whole = 1; |
| 485 | } |
| 486 | if (tp->t_imaxpct_delta != 0) { |
| 487 | INT_MOD(sbp->sb_imax_pct, ARCH_CONVERT, tp->t_imaxpct_delta); |
| 488 | whole = 1; |
| 489 | } |
| 490 | if (tp->t_rextsize_delta != 0) { |
| 491 | INT_MOD(sbp->sb_rextsize, ARCH_CONVERT, tp->t_rextsize_delta); |
| 492 | whole = 1; |
| 493 | } |
| 494 | if (tp->t_rbmblocks_delta != 0) { |
| 495 | INT_MOD(sbp->sb_rbmblocks, ARCH_CONVERT, tp->t_rbmblocks_delta); |
| 496 | whole = 1; |
| 497 | } |
| 498 | if (tp->t_rblocks_delta != 0) { |
| 499 | INT_MOD(sbp->sb_rblocks, ARCH_CONVERT, tp->t_rblocks_delta); |
| 500 | whole = 1; |
| 501 | } |
| 502 | if (tp->t_rextents_delta != 0) { |
| 503 | INT_MOD(sbp->sb_rextents, ARCH_CONVERT, tp->t_rextents_delta); |
| 504 | whole = 1; |
| 505 | } |
| 506 | if (tp->t_rextslog_delta != 0) { |
| 507 | INT_MOD(sbp->sb_rextslog, ARCH_CONVERT, tp->t_rextslog_delta); |
| 508 | whole = 1; |
| 509 | } |
| 510 | |
| 511 | if (whole) |
| 512 | /* |
| 513 | * Log the whole thing, the fields are discontiguous. |
| 514 | */ |
| 515 | xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_sb_t) - 1); |
| 516 | else |
| 517 | /* |
| 518 | * Since all the modifiable fields are contiguous, we |
| 519 | * can get away with this. |
| 520 | */ |
| 521 | xfs_trans_log_buf(tp, bp, offsetof(xfs_sb_t, sb_icount), |
| 522 | offsetof(xfs_sb_t, sb_frextents) + |
| 523 | sizeof(sbp->sb_frextents) - 1); |
| 524 | |
| 525 | XFS_MTOVFS(tp->t_mountp)->vfs_super->s_dirt = 1; |
| 526 | } |
| 527 | |
| 528 | /* |
| 529 | * xfs_trans_unreserve_and_mod_sb() is called to release unused |
| 530 | * reservations and apply superblock counter changes to the in-core |
| 531 | * superblock. |
| 532 | * |
| 533 | * This is done efficiently with a single call to xfs_mod_incore_sb_batch(). |
| 534 | */ |
Christoph Hellwig | ba0f32d | 2005-06-21 15:36:52 +1000 | [diff] [blame^] | 535 | STATIC void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | xfs_trans_unreserve_and_mod_sb( |
| 537 | xfs_trans_t *tp) |
| 538 | { |
| 539 | xfs_mod_sb_t msb[14]; /* If you add cases, add entries */ |
| 540 | xfs_mod_sb_t *msbp; |
| 541 | /* REFERENCED */ |
| 542 | int error; |
| 543 | int rsvd; |
| 544 | |
| 545 | msbp = msb; |
| 546 | rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0; |
| 547 | |
| 548 | /* |
| 549 | * Release any reserved blocks. Any that were allocated |
| 550 | * will be taken back again by fdblocks_delta below. |
| 551 | */ |
| 552 | if (tp->t_blk_res > 0) { |
| 553 | msbp->msb_field = XFS_SBS_FDBLOCKS; |
| 554 | msbp->msb_delta = tp->t_blk_res; |
| 555 | msbp++; |
| 556 | } |
| 557 | |
| 558 | /* |
| 559 | * Release any reserved real time extents . Any that were |
| 560 | * allocated will be taken back again by frextents_delta below. |
| 561 | */ |
| 562 | if (tp->t_rtx_res > 0) { |
| 563 | msbp->msb_field = XFS_SBS_FREXTENTS; |
| 564 | msbp->msb_delta = tp->t_rtx_res; |
| 565 | msbp++; |
| 566 | } |
| 567 | |
| 568 | /* |
| 569 | * Apply any superblock modifications to the in-core version. |
| 570 | * The t_res_fdblocks_delta and t_res_frextents_delta fields are |
| 571 | * explicity NOT applied to the in-core superblock. |
| 572 | * The idea is that that has already been done. |
| 573 | */ |
| 574 | if (tp->t_flags & XFS_TRANS_SB_DIRTY) { |
| 575 | if (tp->t_icount_delta != 0) { |
| 576 | msbp->msb_field = XFS_SBS_ICOUNT; |
| 577 | msbp->msb_delta = (int)tp->t_icount_delta; |
| 578 | msbp++; |
| 579 | } |
| 580 | if (tp->t_ifree_delta != 0) { |
| 581 | msbp->msb_field = XFS_SBS_IFREE; |
| 582 | msbp->msb_delta = (int)tp->t_ifree_delta; |
| 583 | msbp++; |
| 584 | } |
| 585 | if (tp->t_fdblocks_delta != 0) { |
| 586 | msbp->msb_field = XFS_SBS_FDBLOCKS; |
| 587 | msbp->msb_delta = (int)tp->t_fdblocks_delta; |
| 588 | msbp++; |
| 589 | } |
| 590 | if (tp->t_frextents_delta != 0) { |
| 591 | msbp->msb_field = XFS_SBS_FREXTENTS; |
| 592 | msbp->msb_delta = (int)tp->t_frextents_delta; |
| 593 | msbp++; |
| 594 | } |
| 595 | if (tp->t_dblocks_delta != 0) { |
| 596 | msbp->msb_field = XFS_SBS_DBLOCKS; |
| 597 | msbp->msb_delta = (int)tp->t_dblocks_delta; |
| 598 | msbp++; |
| 599 | } |
| 600 | if (tp->t_agcount_delta != 0) { |
| 601 | msbp->msb_field = XFS_SBS_AGCOUNT; |
| 602 | msbp->msb_delta = (int)tp->t_agcount_delta; |
| 603 | msbp++; |
| 604 | } |
| 605 | if (tp->t_imaxpct_delta != 0) { |
| 606 | msbp->msb_field = XFS_SBS_IMAX_PCT; |
| 607 | msbp->msb_delta = (int)tp->t_imaxpct_delta; |
| 608 | msbp++; |
| 609 | } |
| 610 | if (tp->t_rextsize_delta != 0) { |
| 611 | msbp->msb_field = XFS_SBS_REXTSIZE; |
| 612 | msbp->msb_delta = (int)tp->t_rextsize_delta; |
| 613 | msbp++; |
| 614 | } |
| 615 | if (tp->t_rbmblocks_delta != 0) { |
| 616 | msbp->msb_field = XFS_SBS_RBMBLOCKS; |
| 617 | msbp->msb_delta = (int)tp->t_rbmblocks_delta; |
| 618 | msbp++; |
| 619 | } |
| 620 | if (tp->t_rblocks_delta != 0) { |
| 621 | msbp->msb_field = XFS_SBS_RBLOCKS; |
| 622 | msbp->msb_delta = (int)tp->t_rblocks_delta; |
| 623 | msbp++; |
| 624 | } |
| 625 | if (tp->t_rextents_delta != 0) { |
| 626 | msbp->msb_field = XFS_SBS_REXTENTS; |
| 627 | msbp->msb_delta = (int)tp->t_rextents_delta; |
| 628 | msbp++; |
| 629 | } |
| 630 | if (tp->t_rextslog_delta != 0) { |
| 631 | msbp->msb_field = XFS_SBS_REXTSLOG; |
| 632 | msbp->msb_delta = (int)tp->t_rextslog_delta; |
| 633 | msbp++; |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | /* |
| 638 | * If we need to change anything, do it. |
| 639 | */ |
| 640 | if (msbp > msb) { |
| 641 | error = xfs_mod_incore_sb_batch(tp->t_mountp, msb, |
| 642 | (uint)(msbp - msb), rsvd); |
| 643 | ASSERT(error == 0); |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | |
| 648 | /* |
| 649 | * xfs_trans_commit |
| 650 | * |
| 651 | * Commit the given transaction to the log a/synchronously. |
| 652 | * |
| 653 | * XFS disk error handling mechanism is not based on a typical |
| 654 | * transaction abort mechanism. Logically after the filesystem |
| 655 | * gets marked 'SHUTDOWN', we can't let any new transactions |
| 656 | * be durable - ie. committed to disk - because some metadata might |
| 657 | * be inconsistent. In such cases, this returns an error, and the |
| 658 | * caller may assume that all locked objects joined to the transaction |
| 659 | * have already been unlocked as if the commit had succeeded. |
| 660 | * Do not reference the transaction structure after this call. |
| 661 | */ |
| 662 | /*ARGSUSED*/ |
| 663 | int |
| 664 | xfs_trans_commit( |
| 665 | xfs_trans_t *tp, |
| 666 | uint flags, |
| 667 | xfs_lsn_t *commit_lsn_p) |
| 668 | { |
| 669 | xfs_log_iovec_t *log_vector; |
| 670 | int nvec; |
| 671 | xfs_mount_t *mp; |
| 672 | xfs_lsn_t commit_lsn; |
| 673 | /* REFERENCED */ |
| 674 | int error; |
| 675 | int log_flags; |
| 676 | int sync; |
| 677 | #define XFS_TRANS_LOGVEC_COUNT 16 |
| 678 | xfs_log_iovec_t log_vector_fast[XFS_TRANS_LOGVEC_COUNT]; |
| 679 | #if defined(XLOG_NOLOG) || defined(DEBUG) |
| 680 | static xfs_lsn_t trans_lsn = 1; |
| 681 | #endif |
| 682 | void *commit_iclog; |
| 683 | int shutdown; |
| 684 | |
| 685 | commit_lsn = -1; |
| 686 | |
| 687 | /* |
| 688 | * Determine whether this commit is releasing a permanent |
| 689 | * log reservation or not. |
| 690 | */ |
| 691 | if (flags & XFS_TRANS_RELEASE_LOG_RES) { |
| 692 | ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); |
| 693 | log_flags = XFS_LOG_REL_PERM_RESERV; |
| 694 | } else { |
| 695 | log_flags = 0; |
| 696 | } |
| 697 | mp = tp->t_mountp; |
| 698 | |
| 699 | /* |
| 700 | * If there is nothing to be logged by the transaction, |
| 701 | * then unlock all of the items associated with the |
| 702 | * transaction and free the transaction structure. |
| 703 | * Also make sure to return any reserved blocks to |
| 704 | * the free pool. |
| 705 | */ |
| 706 | shut_us_down: |
| 707 | shutdown = XFS_FORCED_SHUTDOWN(mp) ? EIO : 0; |
| 708 | if (!(tp->t_flags & XFS_TRANS_DIRTY) || shutdown) { |
| 709 | xfs_trans_unreserve_and_mod_sb(tp); |
| 710 | /* |
| 711 | * It is indeed possible for the transaction to be |
| 712 | * not dirty but the dqinfo portion to be. All that |
| 713 | * means is that we have some (non-persistent) quota |
| 714 | * reservations that need to be unreserved. |
| 715 | */ |
| 716 | XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(mp, tp); |
| 717 | if (tp->t_ticket) { |
| 718 | commit_lsn = xfs_log_done(mp, tp->t_ticket, |
| 719 | NULL, log_flags); |
| 720 | if (commit_lsn == -1 && !shutdown) |
| 721 | shutdown = XFS_ERROR(EIO); |
| 722 | } |
| 723 | PFLAGS_RESTORE_FSTRANS(&tp->t_pflags); |
| 724 | xfs_trans_free_items(tp, shutdown? XFS_TRANS_ABORT : 0); |
| 725 | xfs_trans_free_busy(tp); |
| 726 | xfs_trans_free(tp); |
| 727 | XFS_STATS_INC(xs_trans_empty); |
| 728 | if (commit_lsn_p) |
| 729 | *commit_lsn_p = commit_lsn; |
| 730 | return (shutdown); |
| 731 | } |
| 732 | #if defined(XLOG_NOLOG) || defined(DEBUG) |
| 733 | ASSERT(!xlog_debug || tp->t_ticket != NULL); |
| 734 | #else |
| 735 | ASSERT(tp->t_ticket != NULL); |
| 736 | #endif |
| 737 | |
| 738 | /* |
| 739 | * If we need to update the superblock, then do it now. |
| 740 | */ |
| 741 | if (tp->t_flags & XFS_TRANS_SB_DIRTY) { |
| 742 | xfs_trans_apply_sb_deltas(tp); |
| 743 | } |
| 744 | XFS_TRANS_APPLY_DQUOT_DELTAS(mp, tp); |
| 745 | |
| 746 | /* |
| 747 | * Ask each log item how many log_vector entries it will |
| 748 | * need so we can figure out how many to allocate. |
| 749 | * Try to avoid the kmem_alloc() call in the common case |
| 750 | * by using a vector from the stack when it fits. |
| 751 | */ |
| 752 | nvec = xfs_trans_count_vecs(tp); |
| 753 | |
| 754 | if (nvec == 0) { |
| 755 | xfs_force_shutdown(mp, XFS_LOG_IO_ERROR); |
| 756 | goto shut_us_down; |
| 757 | } |
| 758 | |
| 759 | |
| 760 | if (nvec <= XFS_TRANS_LOGVEC_COUNT) { |
| 761 | log_vector = log_vector_fast; |
| 762 | } else { |
| 763 | log_vector = (xfs_log_iovec_t *)kmem_alloc(nvec * |
| 764 | sizeof(xfs_log_iovec_t), |
| 765 | KM_SLEEP); |
| 766 | } |
| 767 | |
| 768 | /* |
| 769 | * Fill in the log_vector and pin the logged items, and |
| 770 | * then write the transaction to the log. |
| 771 | */ |
| 772 | xfs_trans_fill_vecs(tp, log_vector); |
| 773 | |
| 774 | /* |
| 775 | * Ignore errors here. xfs_log_done would do the right thing. |
| 776 | * We need to put the ticket, etc. away. |
| 777 | */ |
| 778 | error = xfs_log_write(mp, log_vector, nvec, tp->t_ticket, |
| 779 | &(tp->t_lsn)); |
| 780 | |
| 781 | #if defined(XLOG_NOLOG) || defined(DEBUG) |
| 782 | if (xlog_debug) { |
| 783 | commit_lsn = xfs_log_done(mp, tp->t_ticket, |
| 784 | &commit_iclog, log_flags); |
| 785 | } else { |
| 786 | commit_lsn = 0; |
| 787 | tp->t_lsn = trans_lsn++; |
| 788 | } |
| 789 | #else |
| 790 | /* |
| 791 | * This is the regular case. At this point (after the call finishes), |
| 792 | * the transaction is committed incore and could go out to disk at |
| 793 | * any time. However, all the items associated with the transaction |
| 794 | * are still locked and pinned in memory. |
| 795 | */ |
| 796 | commit_lsn = xfs_log_done(mp, tp->t_ticket, &commit_iclog, log_flags); |
| 797 | #endif |
| 798 | |
| 799 | tp->t_commit_lsn = commit_lsn; |
| 800 | if (nvec > XFS_TRANS_LOGVEC_COUNT) { |
| 801 | kmem_free(log_vector, nvec * sizeof(xfs_log_iovec_t)); |
| 802 | } |
| 803 | |
| 804 | if (commit_lsn_p) |
| 805 | *commit_lsn_p = commit_lsn; |
| 806 | |
| 807 | /* |
| 808 | * If we got a log write error. Unpin the logitems that we |
| 809 | * had pinned, clean up, free trans structure, and return error. |
| 810 | */ |
| 811 | if (error || commit_lsn == -1) { |
| 812 | PFLAGS_RESTORE_FSTRANS(&tp->t_pflags); |
| 813 | xfs_trans_uncommit(tp, flags|XFS_TRANS_ABORT); |
| 814 | return XFS_ERROR(EIO); |
| 815 | } |
| 816 | |
| 817 | /* |
| 818 | * Once the transaction has committed, unused |
| 819 | * reservations need to be released and changes to |
| 820 | * the superblock need to be reflected in the in-core |
| 821 | * version. Do that now. |
| 822 | */ |
| 823 | xfs_trans_unreserve_and_mod_sb(tp); |
| 824 | |
| 825 | sync = tp->t_flags & XFS_TRANS_SYNC; |
| 826 | |
| 827 | /* |
| 828 | * Tell the LM to call the transaction completion routine |
| 829 | * when the log write with LSN commit_lsn completes (e.g. |
| 830 | * when the transaction commit really hits the on-disk log). |
| 831 | * After this call we cannot reference tp, because the call |
| 832 | * can happen at any time and the call will free the transaction |
| 833 | * structure pointed to by tp. The only case where we call |
| 834 | * the completion routine (xfs_trans_committed) directly is |
| 835 | * if the log is turned off on a debug kernel or we're |
| 836 | * running in simulation mode (the log is explicitly turned |
| 837 | * off). |
| 838 | */ |
| 839 | tp->t_logcb.cb_func = (void(*)(void*, int))xfs_trans_committed; |
| 840 | tp->t_logcb.cb_arg = tp; |
| 841 | |
| 842 | /* |
| 843 | * We need to pass the iclog buffer which was used for the |
| 844 | * transaction commit record into this function, and attach |
| 845 | * the callback to it. The callback must be attached before |
| 846 | * the items are unlocked to avoid racing with other threads |
| 847 | * waiting for an item to unlock. |
| 848 | */ |
| 849 | shutdown = xfs_log_notify(mp, commit_iclog, &(tp->t_logcb)); |
| 850 | |
| 851 | /* |
| 852 | * Mark this thread as no longer being in a transaction |
| 853 | */ |
| 854 | PFLAGS_RESTORE_FSTRANS(&tp->t_pflags); |
| 855 | |
| 856 | /* |
| 857 | * Once all the items of the transaction have been copied |
| 858 | * to the in core log and the callback is attached, the |
| 859 | * items can be unlocked. |
| 860 | * |
| 861 | * This will free descriptors pointing to items which were |
| 862 | * not logged since there is nothing more to do with them. |
| 863 | * For items which were logged, we will keep pointers to them |
| 864 | * so they can be unpinned after the transaction commits to disk. |
| 865 | * This will also stamp each modified meta-data item with |
| 866 | * the commit lsn of this transaction for dependency tracking |
| 867 | * purposes. |
| 868 | */ |
| 869 | xfs_trans_unlock_items(tp, commit_lsn); |
| 870 | |
| 871 | /* |
| 872 | * If we detected a log error earlier, finish committing |
| 873 | * the transaction now (unpin log items, etc). |
| 874 | * |
| 875 | * Order is critical here, to avoid using the transaction |
| 876 | * pointer after its been freed (by xfs_trans_committed |
| 877 | * either here now, or as a callback). We cannot do this |
| 878 | * step inside xfs_log_notify as was done earlier because |
| 879 | * of this issue. |
| 880 | */ |
| 881 | if (shutdown) |
| 882 | xfs_trans_committed(tp, XFS_LI_ABORTED); |
| 883 | |
| 884 | /* |
| 885 | * Now that the xfs_trans_committed callback has been attached, |
| 886 | * and the items are released we can finally allow the iclog to |
| 887 | * go to disk. |
| 888 | */ |
| 889 | error = xfs_log_release_iclog(mp, commit_iclog); |
| 890 | |
| 891 | /* |
| 892 | * If the transaction needs to be synchronous, then force the |
| 893 | * log out now and wait for it. |
| 894 | */ |
| 895 | if (sync) { |
| 896 | if (!error) |
| 897 | error = xfs_log_force(mp, commit_lsn, |
| 898 | XFS_LOG_FORCE | XFS_LOG_SYNC); |
| 899 | XFS_STATS_INC(xs_trans_sync); |
| 900 | } else { |
| 901 | XFS_STATS_INC(xs_trans_async); |
| 902 | } |
| 903 | |
| 904 | return (error); |
| 905 | } |
| 906 | |
| 907 | |
| 908 | /* |
| 909 | * Total up the number of log iovecs needed to commit this |
| 910 | * transaction. The transaction itself needs one for the |
| 911 | * transaction header. Ask each dirty item in turn how many |
| 912 | * it needs to get the total. |
| 913 | */ |
| 914 | STATIC uint |
| 915 | xfs_trans_count_vecs( |
| 916 | xfs_trans_t *tp) |
| 917 | { |
| 918 | int nvecs; |
| 919 | xfs_log_item_desc_t *lidp; |
| 920 | |
| 921 | nvecs = 1; |
| 922 | lidp = xfs_trans_first_item(tp); |
| 923 | ASSERT(lidp != NULL); |
| 924 | |
| 925 | /* In the non-debug case we need to start bailing out if we |
| 926 | * didn't find a log_item here, return zero and let trans_commit |
| 927 | * deal with it. |
| 928 | */ |
| 929 | if (lidp == NULL) |
| 930 | return 0; |
| 931 | |
| 932 | while (lidp != NULL) { |
| 933 | /* |
| 934 | * Skip items which aren't dirty in this transaction. |
| 935 | */ |
| 936 | if (!(lidp->lid_flags & XFS_LID_DIRTY)) { |
| 937 | lidp = xfs_trans_next_item(tp, lidp); |
| 938 | continue; |
| 939 | } |
| 940 | lidp->lid_size = IOP_SIZE(lidp->lid_item); |
| 941 | nvecs += lidp->lid_size; |
| 942 | lidp = xfs_trans_next_item(tp, lidp); |
| 943 | } |
| 944 | |
| 945 | return nvecs; |
| 946 | } |
| 947 | |
| 948 | /* |
| 949 | * Called from the trans_commit code when we notice that |
| 950 | * the filesystem is in the middle of a forced shutdown. |
| 951 | */ |
| 952 | STATIC void |
| 953 | xfs_trans_uncommit( |
| 954 | xfs_trans_t *tp, |
| 955 | uint flags) |
| 956 | { |
| 957 | xfs_log_item_desc_t *lidp; |
| 958 | |
| 959 | for (lidp = xfs_trans_first_item(tp); |
| 960 | lidp != NULL; |
| 961 | lidp = xfs_trans_next_item(tp, lidp)) { |
| 962 | /* |
| 963 | * Unpin all but those that aren't dirty. |
| 964 | */ |
| 965 | if (lidp->lid_flags & XFS_LID_DIRTY) |
| 966 | IOP_UNPIN_REMOVE(lidp->lid_item, tp); |
| 967 | } |
| 968 | |
| 969 | xfs_trans_unreserve_and_mod_sb(tp); |
| 970 | XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(tp->t_mountp, tp); |
| 971 | |
| 972 | xfs_trans_free_items(tp, flags); |
| 973 | xfs_trans_free_busy(tp); |
| 974 | xfs_trans_free(tp); |
| 975 | } |
| 976 | |
| 977 | /* |
| 978 | * Fill in the vector with pointers to data to be logged |
| 979 | * by this transaction. The transaction header takes |
| 980 | * the first vector, and then each dirty item takes the |
| 981 | * number of vectors it indicated it needed in xfs_trans_count_vecs(). |
| 982 | * |
| 983 | * As each item fills in the entries it needs, also pin the item |
| 984 | * so that it cannot be flushed out until the log write completes. |
| 985 | */ |
| 986 | STATIC void |
| 987 | xfs_trans_fill_vecs( |
| 988 | xfs_trans_t *tp, |
| 989 | xfs_log_iovec_t *log_vector) |
| 990 | { |
| 991 | xfs_log_item_desc_t *lidp; |
| 992 | xfs_log_iovec_t *vecp; |
| 993 | uint nitems; |
| 994 | |
| 995 | /* |
| 996 | * Skip over the entry for the transaction header, we'll |
| 997 | * fill that in at the end. |
| 998 | */ |
| 999 | vecp = log_vector + 1; /* pointer arithmetic */ |
| 1000 | |
| 1001 | nitems = 0; |
| 1002 | lidp = xfs_trans_first_item(tp); |
| 1003 | ASSERT(lidp != NULL); |
| 1004 | while (lidp != NULL) { |
| 1005 | /* |
| 1006 | * Skip items which aren't dirty in this transaction. |
| 1007 | */ |
| 1008 | if (!(lidp->lid_flags & XFS_LID_DIRTY)) { |
| 1009 | lidp = xfs_trans_next_item(tp, lidp); |
| 1010 | continue; |
| 1011 | } |
| 1012 | /* |
| 1013 | * The item may be marked dirty but not log anything. |
| 1014 | * This can be used to get called when a transaction |
| 1015 | * is committed. |
| 1016 | */ |
| 1017 | if (lidp->lid_size) { |
| 1018 | nitems++; |
| 1019 | } |
| 1020 | IOP_FORMAT(lidp->lid_item, vecp); |
| 1021 | vecp += lidp->lid_size; /* pointer arithmetic */ |
| 1022 | IOP_PIN(lidp->lid_item); |
| 1023 | lidp = xfs_trans_next_item(tp, lidp); |
| 1024 | } |
| 1025 | |
| 1026 | /* |
| 1027 | * Now that we've counted the number of items in this |
| 1028 | * transaction, fill in the transaction header. |
| 1029 | */ |
| 1030 | tp->t_header.th_magic = XFS_TRANS_HEADER_MAGIC; |
| 1031 | tp->t_header.th_type = tp->t_type; |
| 1032 | tp->t_header.th_num_items = nitems; |
| 1033 | log_vector->i_addr = (xfs_caddr_t)&tp->t_header; |
| 1034 | log_vector->i_len = sizeof(xfs_trans_header_t); |
| 1035 | } |
| 1036 | |
| 1037 | |
| 1038 | /* |
| 1039 | * Unlock all of the transaction's items and free the transaction. |
| 1040 | * The transaction must not have modified any of its items, because |
| 1041 | * there is no way to restore them to their previous state. |
| 1042 | * |
| 1043 | * If the transaction has made a log reservation, make sure to release |
| 1044 | * it as well. |
| 1045 | */ |
| 1046 | void |
| 1047 | xfs_trans_cancel( |
| 1048 | xfs_trans_t *tp, |
| 1049 | int flags) |
| 1050 | { |
| 1051 | int log_flags; |
| 1052 | #ifdef DEBUG |
| 1053 | xfs_log_item_chunk_t *licp; |
| 1054 | xfs_log_item_desc_t *lidp; |
| 1055 | xfs_log_item_t *lip; |
| 1056 | int i; |
| 1057 | #endif |
| 1058 | |
| 1059 | /* |
| 1060 | * See if the caller is being too lazy to figure out if |
| 1061 | * the transaction really needs an abort. |
| 1062 | */ |
| 1063 | if ((flags & XFS_TRANS_ABORT) && !(tp->t_flags & XFS_TRANS_DIRTY)) |
| 1064 | flags &= ~XFS_TRANS_ABORT; |
| 1065 | /* |
| 1066 | * See if the caller is relying on us to shut down the |
| 1067 | * filesystem. This happens in paths where we detect |
| 1068 | * corruption and decide to give up. |
| 1069 | */ |
| 1070 | if ((tp->t_flags & XFS_TRANS_DIRTY) && |
| 1071 | !XFS_FORCED_SHUTDOWN(tp->t_mountp)) |
| 1072 | xfs_force_shutdown(tp->t_mountp, XFS_CORRUPT_INCORE); |
| 1073 | #ifdef DEBUG |
| 1074 | if (!(flags & XFS_TRANS_ABORT)) { |
| 1075 | licp = &(tp->t_items); |
| 1076 | while (licp != NULL) { |
| 1077 | lidp = licp->lic_descs; |
| 1078 | for (i = 0; i < licp->lic_unused; i++, lidp++) { |
| 1079 | if (XFS_LIC_ISFREE(licp, i)) { |
| 1080 | continue; |
| 1081 | } |
| 1082 | |
| 1083 | lip = lidp->lid_item; |
| 1084 | if (!XFS_FORCED_SHUTDOWN(tp->t_mountp)) |
| 1085 | ASSERT(!(lip->li_type == XFS_LI_EFD)); |
| 1086 | } |
| 1087 | licp = licp->lic_next; |
| 1088 | } |
| 1089 | } |
| 1090 | #endif |
| 1091 | xfs_trans_unreserve_and_mod_sb(tp); |
| 1092 | XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(tp->t_mountp, tp); |
| 1093 | |
| 1094 | if (tp->t_ticket) { |
| 1095 | if (flags & XFS_TRANS_RELEASE_LOG_RES) { |
| 1096 | ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); |
| 1097 | log_flags = XFS_LOG_REL_PERM_RESERV; |
| 1098 | } else { |
| 1099 | log_flags = 0; |
| 1100 | } |
| 1101 | xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, log_flags); |
| 1102 | } |
| 1103 | |
| 1104 | /* mark this thread as no longer being in a transaction */ |
| 1105 | PFLAGS_RESTORE_FSTRANS(&tp->t_pflags); |
| 1106 | |
| 1107 | xfs_trans_free_items(tp, flags); |
| 1108 | xfs_trans_free_busy(tp); |
| 1109 | xfs_trans_free(tp); |
| 1110 | } |
| 1111 | |
| 1112 | |
| 1113 | /* |
| 1114 | * Free the transaction structure. If there is more clean up |
| 1115 | * to do when the structure is freed, add it here. |
| 1116 | */ |
| 1117 | STATIC void |
| 1118 | xfs_trans_free( |
| 1119 | xfs_trans_t *tp) |
| 1120 | { |
| 1121 | atomic_dec(&tp->t_mountp->m_active_trans); |
| 1122 | XFS_TRANS_FREE_DQINFO(tp->t_mountp, tp); |
| 1123 | kmem_zone_free(xfs_trans_zone, tp); |
| 1124 | } |
| 1125 | |
| 1126 | |
| 1127 | /* |
| 1128 | * THIS SHOULD BE REWRITTEN TO USE xfs_trans_next_item(). |
| 1129 | * |
| 1130 | * This is typically called by the LM when a transaction has been fully |
| 1131 | * committed to disk. It needs to unpin the items which have |
| 1132 | * been logged by the transaction and update their positions |
| 1133 | * in the AIL if necessary. |
| 1134 | * This also gets called when the transactions didn't get written out |
| 1135 | * because of an I/O error. Abortflag & XFS_LI_ABORTED is set then. |
| 1136 | * |
| 1137 | * Call xfs_trans_chunk_committed() to process the items in |
| 1138 | * each chunk. |
| 1139 | */ |
| 1140 | STATIC void |
| 1141 | xfs_trans_committed( |
| 1142 | xfs_trans_t *tp, |
| 1143 | int abortflag) |
| 1144 | { |
| 1145 | xfs_log_item_chunk_t *licp; |
| 1146 | xfs_log_item_chunk_t *next_licp; |
| 1147 | xfs_log_busy_chunk_t *lbcp; |
| 1148 | xfs_log_busy_slot_t *lbsp; |
| 1149 | int i; |
| 1150 | |
| 1151 | /* |
| 1152 | * Call the transaction's completion callback if there |
| 1153 | * is one. |
| 1154 | */ |
| 1155 | if (tp->t_callback != NULL) { |
| 1156 | tp->t_callback(tp, tp->t_callarg); |
| 1157 | } |
| 1158 | |
| 1159 | /* |
| 1160 | * Special case the chunk embedded in the transaction. |
| 1161 | */ |
| 1162 | licp = &(tp->t_items); |
| 1163 | if (!(XFS_LIC_ARE_ALL_FREE(licp))) { |
| 1164 | xfs_trans_chunk_committed(licp, tp->t_lsn, abortflag); |
| 1165 | } |
| 1166 | |
| 1167 | /* |
| 1168 | * Process the items in each chunk in turn. |
| 1169 | */ |
| 1170 | licp = licp->lic_next; |
| 1171 | while (licp != NULL) { |
| 1172 | ASSERT(!XFS_LIC_ARE_ALL_FREE(licp)); |
| 1173 | xfs_trans_chunk_committed(licp, tp->t_lsn, abortflag); |
| 1174 | next_licp = licp->lic_next; |
| 1175 | kmem_free(licp, sizeof(xfs_log_item_chunk_t)); |
| 1176 | licp = next_licp; |
| 1177 | } |
| 1178 | |
| 1179 | /* |
| 1180 | * Clear all the per-AG busy list items listed in this transaction |
| 1181 | */ |
| 1182 | lbcp = &tp->t_busy; |
| 1183 | while (lbcp != NULL) { |
| 1184 | for (i = 0, lbsp = lbcp->lbc_busy; i < lbcp->lbc_unused; i++, lbsp++) { |
| 1185 | if (!XFS_LBC_ISFREE(lbcp, i)) { |
| 1186 | xfs_alloc_clear_busy(tp, lbsp->lbc_ag, |
| 1187 | lbsp->lbc_idx); |
| 1188 | } |
| 1189 | } |
| 1190 | lbcp = lbcp->lbc_next; |
| 1191 | } |
| 1192 | xfs_trans_free_busy(tp); |
| 1193 | |
| 1194 | /* |
| 1195 | * That's it for the transaction structure. Free it. |
| 1196 | */ |
| 1197 | xfs_trans_free(tp); |
| 1198 | } |
| 1199 | |
| 1200 | /* |
| 1201 | * This is called to perform the commit processing for each |
| 1202 | * item described by the given chunk. |
| 1203 | * |
| 1204 | * The commit processing consists of unlocking items which were |
| 1205 | * held locked with the SYNC_UNLOCK attribute, calling the committed |
| 1206 | * routine of each logged item, updating the item's position in the AIL |
| 1207 | * if necessary, and unpinning each item. If the committed routine |
| 1208 | * returns -1, then do nothing further with the item because it |
| 1209 | * may have been freed. |
| 1210 | * |
| 1211 | * Since items are unlocked when they are copied to the incore |
| 1212 | * log, it is possible for two transactions to be completing |
| 1213 | * and manipulating the same item simultaneously. The AIL lock |
| 1214 | * will protect the lsn field of each item. The value of this |
| 1215 | * field can never go backwards. |
| 1216 | * |
| 1217 | * We unpin the items after repositioning them in the AIL, because |
| 1218 | * otherwise they could be immediately flushed and we'd have to race |
| 1219 | * with the flusher trying to pull the item from the AIL as we add it. |
| 1220 | */ |
| 1221 | STATIC void |
| 1222 | xfs_trans_chunk_committed( |
| 1223 | xfs_log_item_chunk_t *licp, |
| 1224 | xfs_lsn_t lsn, |
| 1225 | int aborted) |
| 1226 | { |
| 1227 | xfs_log_item_desc_t *lidp; |
| 1228 | xfs_log_item_t *lip; |
| 1229 | xfs_lsn_t item_lsn; |
| 1230 | struct xfs_mount *mp; |
| 1231 | int i; |
| 1232 | SPLDECL(s); |
| 1233 | |
| 1234 | lidp = licp->lic_descs; |
| 1235 | for (i = 0; i < licp->lic_unused; i++, lidp++) { |
| 1236 | if (XFS_LIC_ISFREE(licp, i)) { |
| 1237 | continue; |
| 1238 | } |
| 1239 | |
| 1240 | lip = lidp->lid_item; |
| 1241 | if (aborted) |
| 1242 | lip->li_flags |= XFS_LI_ABORTED; |
| 1243 | |
| 1244 | /* |
| 1245 | * Send in the ABORTED flag to the COMMITTED routine |
| 1246 | * so that it knows whether the transaction was aborted |
| 1247 | * or not. |
| 1248 | */ |
| 1249 | item_lsn = IOP_COMMITTED(lip, lsn); |
| 1250 | |
| 1251 | /* |
| 1252 | * If the committed routine returns -1, make |
| 1253 | * no more references to the item. |
| 1254 | */ |
| 1255 | if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0) { |
| 1256 | continue; |
| 1257 | } |
| 1258 | |
| 1259 | /* |
| 1260 | * If the returned lsn is greater than what it |
| 1261 | * contained before, update the location of the |
| 1262 | * item in the AIL. If it is not, then do nothing. |
| 1263 | * Items can never move backwards in the AIL. |
| 1264 | * |
| 1265 | * While the new lsn should usually be greater, it |
| 1266 | * is possible that a later transaction completing |
| 1267 | * simultaneously with an earlier one using the |
| 1268 | * same item could complete first with a higher lsn. |
| 1269 | * This would cause the earlier transaction to fail |
| 1270 | * the test below. |
| 1271 | */ |
| 1272 | mp = lip->li_mountp; |
| 1273 | AIL_LOCK(mp,s); |
| 1274 | if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0) { |
| 1275 | /* |
| 1276 | * This will set the item's lsn to item_lsn |
| 1277 | * and update the position of the item in |
| 1278 | * the AIL. |
| 1279 | * |
| 1280 | * xfs_trans_update_ail() drops the AIL lock. |
| 1281 | */ |
| 1282 | xfs_trans_update_ail(mp, lip, item_lsn, s); |
| 1283 | } else { |
| 1284 | AIL_UNLOCK(mp, s); |
| 1285 | } |
| 1286 | |
| 1287 | /* |
| 1288 | * Now that we've repositioned the item in the AIL, |
| 1289 | * unpin it so it can be flushed. Pass information |
| 1290 | * about buffer stale state down from the log item |
| 1291 | * flags, if anyone else stales the buffer we do not |
| 1292 | * want to pay any attention to it. |
| 1293 | */ |
| 1294 | IOP_UNPIN(lip, lidp->lid_flags & XFS_LID_BUF_STALE); |
| 1295 | } |
| 1296 | } |