1 /* 2 * Implementation of operations over global quota file 3 */ 4 #include <linux/spinlock.h> 5 #include <linux/fs.h> 6 #include <linux/slab.h> 7 #include <linux/quota.h> 8 #include <linux/quotaops.h> 9 #include <linux/dqblk_qtree.h> 10 #include <linux/jiffies.h> 11 #include <linux/writeback.h> 12 #include <linux/workqueue.h> 13 14 #include <cluster/masklog.h> 15 16 #include "ocfs2_fs.h" 17 #include "ocfs2.h" 18 #include "alloc.h" 19 #include "blockcheck.h" 20 #include "inode.h" 21 #include "journal.h" 22 #include "file.h" 23 #include "sysfile.h" 24 #include "dlmglue.h" 25 #include "uptodate.h" 26 #include "super.h" 27 #include "buffer_head_io.h" 28 #include "quota.h" 29 #include "ocfs2_trace.h" 30 31 /* 32 * Locking of quotas with OCFS2 is rather complex. Here are rules that 33 * should be obeyed by all the functions: 34 * - any write of quota structure (either to local or global file) is protected 35 * by dqio_mutex or dquot->dq_lock. 36 * - any modification of global quota file holds inode cluster lock, i_mutex, 37 * and ip_alloc_sem of the global quota file (achieved by 38 * ocfs2_lock_global_qf). It also has to hold qinfo_lock. 39 * - an allocation of new blocks for local quota file is protected by 40 * its ip_alloc_sem 41 * 42 * A rough sketch of locking dependencies (lf = local file, gf = global file): 43 * Normal filesystem operation: 44 * start_trans -> dqio_mutex -> write to lf 45 * Syncing of local and global file: 46 * ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock -> 47 * write to gf 48 * -> write to lf 49 * Acquire dquot for the first time: 50 * dq_lock -> ocfs2_lock_global_qf -> qinfo_lock -> read from gf 51 * -> alloc space for gf 52 * -> start_trans -> qinfo_lock -> write to gf 53 * -> ip_alloc_sem of lf -> alloc space for lf 54 * -> write to lf 55 * Release last reference to dquot: 56 * dq_lock -> ocfs2_lock_global_qf -> start_trans -> qinfo_lock -> write to gf 57 * -> write to lf 58 * Note that all the above operations also hold the inode cluster lock of lf. 59 * Recovery: 60 * inode cluster lock of recovered lf 61 * -> read bitmaps -> ip_alloc_sem of lf 62 * -> ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock -> 63 * write to gf 64 */ 65 66 static void qsync_work_fn(struct work_struct *work); 67 68 static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp) 69 { 70 struct ocfs2_global_disk_dqblk *d = dp; 71 struct mem_dqblk *m = &dquot->dq_dqb; 72 73 /* Update from disk only entries not set by the admin */ 74 if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) { 75 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit); 76 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit); 77 } 78 if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags)) 79 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes); 80 if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) { 81 m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit); 82 m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit); 83 } 84 if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags)) 85 m->dqb_curspace = le64_to_cpu(d->dqb_curspace); 86 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags)) 87 m->dqb_btime = le64_to_cpu(d->dqb_btime); 88 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags)) 89 m->dqb_itime = le64_to_cpu(d->dqb_itime); 90 OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count); 91 } 92 93 static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot) 94 { 95 struct ocfs2_global_disk_dqblk *d = dp; 96 struct mem_dqblk *m = &dquot->dq_dqb; 97 98 d->dqb_id = cpu_to_le32(dquot->dq_id); 99 d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count); 100 d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit); 101 d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit); 102 d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes); 103 d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit); 104 d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit); 105 d->dqb_curspace = cpu_to_le64(m->dqb_curspace); 106 d->dqb_btime = cpu_to_le64(m->dqb_btime); 107 d->dqb_itime = cpu_to_le64(m->dqb_itime); 108 d->dqb_pad1 = d->dqb_pad2 = 0; 109 } 110 111 static int ocfs2_global_is_id(void *dp, struct dquot *dquot) 112 { 113 struct ocfs2_global_disk_dqblk *d = dp; 114 struct ocfs2_mem_dqinfo *oinfo = 115 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; 116 117 if (qtree_entry_unused(&oinfo->dqi_gi, dp)) 118 return 0; 119 return le32_to_cpu(d->dqb_id) == dquot->dq_id; 120 } 121 122 struct qtree_fmt_operations ocfs2_global_ops = { 123 .mem2disk_dqblk = ocfs2_global_mem2diskdqb, 124 .disk2mem_dqblk = ocfs2_global_disk2memdqb, 125 .is_id = ocfs2_global_is_id, 126 }; 127 128 int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh) 129 { 130 struct ocfs2_disk_dqtrailer *dqt = 131 ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data); 132 133 trace_ocfs2_validate_quota_block((unsigned long long)bh->b_blocknr); 134 135 BUG_ON(!buffer_uptodate(bh)); 136 137 /* 138 * If the ecc fails, we return the error but otherwise 139 * leave the filesystem running. We know any error is 140 * local to this block. 141 */ 142 return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check); 143 } 144 145 int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block, 146 struct buffer_head **bhp) 147 { 148 int rc; 149 150 *bhp = NULL; 151 rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, 1, bhp, 0, 152 ocfs2_validate_quota_block); 153 if (rc) 154 mlog_errno(rc); 155 return rc; 156 } 157 158 /* Read data from global quotafile - avoid pagecache and such because we cannot 159 * afford acquiring the locks... We use quota cluster lock to serialize 160 * operations. Caller is responsible for acquiring it. */ 161 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data, 162 size_t len, loff_t off) 163 { 164 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 165 struct inode *gqinode = oinfo->dqi_gqinode; 166 loff_t i_size = i_size_read(gqinode); 167 int offset = off & (sb->s_blocksize - 1); 168 sector_t blk = off >> sb->s_blocksize_bits; 169 int err = 0; 170 struct buffer_head *bh; 171 size_t toread, tocopy; 172 u64 pblock = 0, pcount = 0; 173 174 if (off > i_size) 175 return 0; 176 if (off + len > i_size) 177 len = i_size - off; 178 toread = len; 179 while (toread > 0) { 180 tocopy = min_t(size_t, (sb->s_blocksize - offset), toread); 181 if (!pcount) { 182 err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, 183 &pcount, NULL); 184 if (err) { 185 mlog_errno(err); 186 return err; 187 } 188 } else { 189 pcount--; 190 pblock++; 191 } 192 bh = NULL; 193 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh); 194 if (err) { 195 mlog_errno(err); 196 return err; 197 } 198 memcpy(data, bh->b_data + offset, tocopy); 199 brelse(bh); 200 offset = 0; 201 toread -= tocopy; 202 data += tocopy; 203 blk++; 204 } 205 return len; 206 } 207 208 /* Write to quotafile (we know the transaction is already started and has 209 * enough credits) */ 210 ssize_t ocfs2_quota_write(struct super_block *sb, int type, 211 const char *data, size_t len, loff_t off) 212 { 213 struct mem_dqinfo *info = sb_dqinfo(sb, type); 214 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv; 215 struct inode *gqinode = oinfo->dqi_gqinode; 216 int offset = off & (sb->s_blocksize - 1); 217 sector_t blk = off >> sb->s_blocksize_bits; 218 int err = 0, new = 0, ja_type; 219 struct buffer_head *bh = NULL; 220 handle_t *handle = journal_current_handle(); 221 u64 pblock, pcount; 222 223 if (!handle) { 224 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled " 225 "because transaction was not started.\n", 226 (unsigned long long)off, (unsigned long long)len); 227 return -EIO; 228 } 229 if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) { 230 WARN_ON(1); 231 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset; 232 } 233 234 if (gqinode->i_size < off + len) { 235 loff_t rounded_end = 236 ocfs2_align_bytes_to_blocks(sb, off + len); 237 238 /* Space is already allocated in ocfs2_acquire_dquot() */ 239 err = ocfs2_simple_size_update(gqinode, 240 oinfo->dqi_gqi_bh, 241 rounded_end); 242 if (err < 0) 243 goto out; 244 new = 1; 245 } 246 err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, &pcount, NULL); 247 if (err) { 248 mlog_errno(err); 249 goto out; 250 } 251 /* Not rewriting whole block? */ 252 if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) && 253 !new) { 254 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh); 255 ja_type = OCFS2_JOURNAL_ACCESS_WRITE; 256 } else { 257 bh = sb_getblk(sb, pblock); 258 if (!bh) 259 err = -ENOMEM; 260 ja_type = OCFS2_JOURNAL_ACCESS_CREATE; 261 } 262 if (err) { 263 mlog_errno(err); 264 goto out; 265 } 266 lock_buffer(bh); 267 if (new) 268 memset(bh->b_data, 0, sb->s_blocksize); 269 memcpy(bh->b_data + offset, data, len); 270 flush_dcache_page(bh->b_page); 271 set_buffer_uptodate(bh); 272 unlock_buffer(bh); 273 ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh); 274 err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh, 275 ja_type); 276 if (err < 0) { 277 brelse(bh); 278 goto out; 279 } 280 ocfs2_journal_dirty(handle, bh); 281 brelse(bh); 282 out: 283 if (err) { 284 mlog_errno(err); 285 return err; 286 } 287 gqinode->i_version++; 288 ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh); 289 return len; 290 } 291 292 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex) 293 { 294 int status; 295 struct buffer_head *bh = NULL; 296 297 status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex); 298 if (status < 0) 299 return status; 300 spin_lock(&dq_data_lock); 301 if (!oinfo->dqi_gqi_count++) 302 oinfo->dqi_gqi_bh = bh; 303 else 304 WARN_ON(bh != oinfo->dqi_gqi_bh); 305 spin_unlock(&dq_data_lock); 306 if (ex) { 307 mutex_lock(&oinfo->dqi_gqinode->i_mutex); 308 down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem); 309 } else { 310 down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem); 311 } 312 return 0; 313 } 314 315 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex) 316 { 317 if (ex) { 318 up_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem); 319 mutex_unlock(&oinfo->dqi_gqinode->i_mutex); 320 } else { 321 up_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem); 322 } 323 ocfs2_inode_unlock(oinfo->dqi_gqinode, ex); 324 brelse(oinfo->dqi_gqi_bh); 325 spin_lock(&dq_data_lock); 326 if (!--oinfo->dqi_gqi_count) 327 oinfo->dqi_gqi_bh = NULL; 328 spin_unlock(&dq_data_lock); 329 } 330 331 /* Read information header from global quota file */ 332 int ocfs2_global_read_info(struct super_block *sb, int type) 333 { 334 struct inode *gqinode = NULL; 335 unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE, 336 GROUP_QUOTA_SYSTEM_INODE }; 337 struct ocfs2_global_disk_dqinfo dinfo; 338 struct mem_dqinfo *info = sb_dqinfo(sb, type); 339 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv; 340 u64 pcount; 341 int status; 342 343 /* Read global header */ 344 gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type], 345 OCFS2_INVALID_SLOT); 346 if (!gqinode) { 347 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n", 348 type); 349 status = -EINVAL; 350 goto out_err; 351 } 352 oinfo->dqi_gi.dqi_sb = sb; 353 oinfo->dqi_gi.dqi_type = type; 354 ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo); 355 oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk); 356 oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops; 357 oinfo->dqi_gqi_bh = NULL; 358 oinfo->dqi_gqi_count = 0; 359 oinfo->dqi_gqinode = gqinode; 360 status = ocfs2_lock_global_qf(oinfo, 0); 361 if (status < 0) { 362 mlog_errno(status); 363 goto out_err; 364 } 365 366 status = ocfs2_extent_map_get_blocks(gqinode, 0, &oinfo->dqi_giblk, 367 &pcount, NULL); 368 if (status < 0) 369 goto out_unlock; 370 371 status = ocfs2_qinfo_lock(oinfo, 0); 372 if (status < 0) 373 goto out_unlock; 374 status = sb->s_op->quota_read(sb, type, (char *)&dinfo, 375 sizeof(struct ocfs2_global_disk_dqinfo), 376 OCFS2_GLOBAL_INFO_OFF); 377 ocfs2_qinfo_unlock(oinfo, 0); 378 ocfs2_unlock_global_qf(oinfo, 0); 379 if (status != sizeof(struct ocfs2_global_disk_dqinfo)) { 380 mlog(ML_ERROR, "Cannot read global quota info (%d).\n", 381 status); 382 if (status >= 0) 383 status = -EIO; 384 mlog_errno(status); 385 goto out_err; 386 } 387 info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace); 388 info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace); 389 oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms); 390 oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks); 391 oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk); 392 oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry); 393 oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits; 394 oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize - 395 OCFS2_QBLK_RESERVED_SPACE; 396 oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi); 397 INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn); 398 schedule_delayed_work(&oinfo->dqi_sync_work, 399 msecs_to_jiffies(oinfo->dqi_syncms)); 400 401 out_err: 402 if (status) 403 mlog_errno(status); 404 return status; 405 out_unlock: 406 ocfs2_unlock_global_qf(oinfo, 0); 407 mlog_errno(status); 408 goto out_err; 409 } 410 411 /* Write information to global quota file. Expects exlusive lock on quota 412 * file inode and quota info */ 413 static int __ocfs2_global_write_info(struct super_block *sb, int type) 414 { 415 struct mem_dqinfo *info = sb_dqinfo(sb, type); 416 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv; 417 struct ocfs2_global_disk_dqinfo dinfo; 418 ssize_t size; 419 420 spin_lock(&dq_data_lock); 421 info->dqi_flags &= ~DQF_INFO_DIRTY; 422 dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace); 423 dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace); 424 spin_unlock(&dq_data_lock); 425 dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms); 426 dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks); 427 dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk); 428 dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry); 429 size = sb->s_op->quota_write(sb, type, (char *)&dinfo, 430 sizeof(struct ocfs2_global_disk_dqinfo), 431 OCFS2_GLOBAL_INFO_OFF); 432 if (size != sizeof(struct ocfs2_global_disk_dqinfo)) { 433 mlog(ML_ERROR, "Cannot write global quota info structure\n"); 434 if (size >= 0) 435 size = -EIO; 436 return size; 437 } 438 return 0; 439 } 440 441 int ocfs2_global_write_info(struct super_block *sb, int type) 442 { 443 int err; 444 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv; 445 446 err = ocfs2_qinfo_lock(info, 1); 447 if (err < 0) 448 return err; 449 err = __ocfs2_global_write_info(sb, type); 450 ocfs2_qinfo_unlock(info, 1); 451 return err; 452 } 453 454 static int ocfs2_global_qinit_alloc(struct super_block *sb, int type) 455 { 456 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 457 458 /* 459 * We may need to allocate tree blocks and a leaf block but not the 460 * root block 461 */ 462 return oinfo->dqi_gi.dqi_qtree_depth; 463 } 464 465 static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type) 466 { 467 /* We modify all the allocated blocks, tree root, info block and 468 * the inode */ 469 return (ocfs2_global_qinit_alloc(sb, type) + 2) * 470 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1; 471 } 472 473 /* Sync local information about quota modifications with global quota file. 474 * Caller must have started the transaction and obtained exclusive lock for 475 * global quota file inode */ 476 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing) 477 { 478 int err, err2; 479 struct super_block *sb = dquot->dq_sb; 480 int type = dquot->dq_type; 481 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv; 482 struct ocfs2_global_disk_dqblk dqblk; 483 s64 spacechange, inodechange; 484 time_t olditime, oldbtime; 485 486 err = sb->s_op->quota_read(sb, type, (char *)&dqblk, 487 sizeof(struct ocfs2_global_disk_dqblk), 488 dquot->dq_off); 489 if (err != sizeof(struct ocfs2_global_disk_dqblk)) { 490 if (err >= 0) { 491 mlog(ML_ERROR, "Short read from global quota file " 492 "(%u read)\n", err); 493 err = -EIO; 494 } 495 goto out; 496 } 497 498 /* Update space and inode usage. Get also other information from 499 * global quota file so that we don't overwrite any changes there. 500 * We are */ 501 spin_lock(&dq_data_lock); 502 spacechange = dquot->dq_dqb.dqb_curspace - 503 OCFS2_DQUOT(dquot)->dq_origspace; 504 inodechange = dquot->dq_dqb.dqb_curinodes - 505 OCFS2_DQUOT(dquot)->dq_originodes; 506 olditime = dquot->dq_dqb.dqb_itime; 507 oldbtime = dquot->dq_dqb.dqb_btime; 508 ocfs2_global_disk2memdqb(dquot, &dqblk); 509 trace_ocfs2_sync_dquot(dquot->dq_id, dquot->dq_dqb.dqb_curspace, 510 (long long)spacechange, 511 dquot->dq_dqb.dqb_curinodes, 512 (long long)inodechange); 513 if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags)) 514 dquot->dq_dqb.dqb_curspace += spacechange; 515 if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags)) 516 dquot->dq_dqb.dqb_curinodes += inodechange; 517 /* Set properly space grace time... */ 518 if (dquot->dq_dqb.dqb_bsoftlimit && 519 dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) { 520 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) && 521 oldbtime > 0) { 522 if (dquot->dq_dqb.dqb_btime > 0) 523 dquot->dq_dqb.dqb_btime = 524 min(dquot->dq_dqb.dqb_btime, oldbtime); 525 else 526 dquot->dq_dqb.dqb_btime = oldbtime; 527 } 528 } else { 529 dquot->dq_dqb.dqb_btime = 0; 530 clear_bit(DQ_BLKS_B, &dquot->dq_flags); 531 } 532 /* Set properly inode grace time... */ 533 if (dquot->dq_dqb.dqb_isoftlimit && 534 dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) { 535 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) && 536 olditime > 0) { 537 if (dquot->dq_dqb.dqb_itime > 0) 538 dquot->dq_dqb.dqb_itime = 539 min(dquot->dq_dqb.dqb_itime, olditime); 540 else 541 dquot->dq_dqb.dqb_itime = olditime; 542 } 543 } else { 544 dquot->dq_dqb.dqb_itime = 0; 545 clear_bit(DQ_INODES_B, &dquot->dq_flags); 546 } 547 /* All information is properly updated, clear the flags */ 548 __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 549 __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 550 __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 551 __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 552 __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 553 __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 554 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace; 555 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes; 556 spin_unlock(&dq_data_lock); 557 err = ocfs2_qinfo_lock(info, freeing); 558 if (err < 0) { 559 mlog(ML_ERROR, "Failed to lock quota info, losing quota write" 560 " (type=%d, id=%u)\n", dquot->dq_type, 561 (unsigned)dquot->dq_id); 562 goto out; 563 } 564 if (freeing) 565 OCFS2_DQUOT(dquot)->dq_use_count--; 566 err = qtree_write_dquot(&info->dqi_gi, dquot); 567 if (err < 0) 568 goto out_qlock; 569 if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) { 570 err = qtree_release_dquot(&info->dqi_gi, dquot); 571 if (info_dirty(sb_dqinfo(sb, type))) { 572 err2 = __ocfs2_global_write_info(sb, type); 573 if (!err) 574 err = err2; 575 } 576 } 577 out_qlock: 578 ocfs2_qinfo_unlock(info, freeing); 579 out: 580 if (err < 0) 581 mlog_errno(err); 582 return err; 583 } 584 585 /* 586 * Functions for periodic syncing of dquots with global file 587 */ 588 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type) 589 { 590 handle_t *handle; 591 struct super_block *sb = dquot->dq_sb; 592 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 593 struct ocfs2_super *osb = OCFS2_SB(sb); 594 int status = 0; 595 596 trace_ocfs2_sync_dquot_helper(dquot->dq_id, dquot->dq_type, 597 type, sb->s_id); 598 if (type != dquot->dq_type) 599 goto out; 600 status = ocfs2_lock_global_qf(oinfo, 1); 601 if (status < 0) 602 goto out; 603 604 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS); 605 if (IS_ERR(handle)) { 606 status = PTR_ERR(handle); 607 mlog_errno(status); 608 goto out_ilock; 609 } 610 mutex_lock(&sb_dqopt(sb)->dqio_mutex); 611 status = ocfs2_sync_dquot(dquot); 612 if (status < 0) 613 mlog_errno(status); 614 /* We have to write local structure as well... */ 615 status = ocfs2_local_write_dquot(dquot); 616 if (status < 0) 617 mlog_errno(status); 618 mutex_unlock(&sb_dqopt(sb)->dqio_mutex); 619 ocfs2_commit_trans(osb, handle); 620 out_ilock: 621 ocfs2_unlock_global_qf(oinfo, 1); 622 out: 623 return status; 624 } 625 626 static void qsync_work_fn(struct work_struct *work) 627 { 628 struct ocfs2_mem_dqinfo *oinfo = container_of(work, 629 struct ocfs2_mem_dqinfo, 630 dqi_sync_work.work); 631 struct super_block *sb = oinfo->dqi_gqinode->i_sb; 632 633 dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type); 634 schedule_delayed_work(&oinfo->dqi_sync_work, 635 msecs_to_jiffies(oinfo->dqi_syncms)); 636 } 637 638 /* 639 * Wrappers for generic quota functions 640 */ 641 642 static int ocfs2_write_dquot(struct dquot *dquot) 643 { 644 handle_t *handle; 645 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb); 646 int status = 0; 647 648 trace_ocfs2_write_dquot(dquot->dq_id, dquot->dq_type); 649 650 handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS); 651 if (IS_ERR(handle)) { 652 status = PTR_ERR(handle); 653 mlog_errno(status); 654 goto out; 655 } 656 mutex_lock(&sb_dqopt(dquot->dq_sb)->dqio_mutex); 657 status = ocfs2_local_write_dquot(dquot); 658 mutex_unlock(&sb_dqopt(dquot->dq_sb)->dqio_mutex); 659 ocfs2_commit_trans(osb, handle); 660 out: 661 return status; 662 } 663 664 static int ocfs2_calc_qdel_credits(struct super_block *sb, int type) 665 { 666 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 667 /* 668 * We modify tree, leaf block, global info, local chunk header, 669 * global and local inode; OCFS2_QINFO_WRITE_CREDITS already 670 * accounts for inode update 671 */ 672 return (oinfo->dqi_gi.dqi_qtree_depth + 2) * 673 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 674 OCFS2_QINFO_WRITE_CREDITS + 675 OCFS2_INODE_UPDATE_CREDITS; 676 } 677 678 static int ocfs2_release_dquot(struct dquot *dquot) 679 { 680 handle_t *handle; 681 struct ocfs2_mem_dqinfo *oinfo = 682 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; 683 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb); 684 int status = 0; 685 686 trace_ocfs2_release_dquot(dquot->dq_id, dquot->dq_type); 687 688 mutex_lock(&dquot->dq_lock); 689 /* Check whether we are not racing with some other dqget() */ 690 if (atomic_read(&dquot->dq_count) > 1) 691 goto out; 692 status = ocfs2_lock_global_qf(oinfo, 1); 693 if (status < 0) 694 goto out; 695 handle = ocfs2_start_trans(osb, 696 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type)); 697 if (IS_ERR(handle)) { 698 status = PTR_ERR(handle); 699 mlog_errno(status); 700 goto out_ilock; 701 } 702 703 status = ocfs2_global_release_dquot(dquot); 704 if (status < 0) { 705 mlog_errno(status); 706 goto out_trans; 707 } 708 status = ocfs2_local_release_dquot(handle, dquot); 709 /* 710 * If we fail here, we cannot do much as global structure is 711 * already released. So just complain... 712 */ 713 if (status < 0) 714 mlog_errno(status); 715 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 716 out_trans: 717 ocfs2_commit_trans(osb, handle); 718 out_ilock: 719 ocfs2_unlock_global_qf(oinfo, 1); 720 out: 721 mutex_unlock(&dquot->dq_lock); 722 if (status) 723 mlog_errno(status); 724 return status; 725 } 726 727 /* 728 * Read global dquot structure from disk or create it if it does 729 * not exist. Also update use count of the global structure and 730 * create structure in node-local quota file. 731 */ 732 static int ocfs2_acquire_dquot(struct dquot *dquot) 733 { 734 int status = 0, err; 735 int ex = 0; 736 struct super_block *sb = dquot->dq_sb; 737 struct ocfs2_super *osb = OCFS2_SB(sb); 738 int type = dquot->dq_type; 739 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv; 740 struct inode *gqinode = info->dqi_gqinode; 741 int need_alloc = ocfs2_global_qinit_alloc(sb, type); 742 handle_t *handle; 743 744 trace_ocfs2_acquire_dquot(dquot->dq_id, type); 745 mutex_lock(&dquot->dq_lock); 746 /* 747 * We need an exclusive lock, because we're going to update use count 748 * and instantiate possibly new dquot structure 749 */ 750 status = ocfs2_lock_global_qf(info, 1); 751 if (status < 0) 752 goto out; 753 if (!test_bit(DQ_READ_B, &dquot->dq_flags)) { 754 status = ocfs2_qinfo_lock(info, 0); 755 if (status < 0) 756 goto out_dq; 757 status = qtree_read_dquot(&info->dqi_gi, dquot); 758 ocfs2_qinfo_unlock(info, 0); 759 if (status < 0) 760 goto out_dq; 761 } 762 set_bit(DQ_READ_B, &dquot->dq_flags); 763 764 OCFS2_DQUOT(dquot)->dq_use_count++; 765 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace; 766 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes; 767 if (!dquot->dq_off) { /* No real quota entry? */ 768 ex = 1; 769 /* 770 * Add blocks to quota file before we start a transaction since 771 * locking allocators ranks above a transaction start 772 */ 773 WARN_ON(journal_current_handle()); 774 status = ocfs2_extend_no_holes(gqinode, NULL, 775 gqinode->i_size + (need_alloc << sb->s_blocksize_bits), 776 gqinode->i_size); 777 if (status < 0) 778 goto out_dq; 779 } 780 781 handle = ocfs2_start_trans(osb, 782 ocfs2_calc_global_qinit_credits(sb, type)); 783 if (IS_ERR(handle)) { 784 status = PTR_ERR(handle); 785 goto out_dq; 786 } 787 status = ocfs2_qinfo_lock(info, ex); 788 if (status < 0) 789 goto out_trans; 790 status = qtree_write_dquot(&info->dqi_gi, dquot); 791 if (ex && info_dirty(sb_dqinfo(sb, type))) { 792 err = __ocfs2_global_write_info(sb, type); 793 if (!status) 794 status = err; 795 } 796 ocfs2_qinfo_unlock(info, ex); 797 out_trans: 798 ocfs2_commit_trans(osb, handle); 799 out_dq: 800 ocfs2_unlock_global_qf(info, 1); 801 if (status < 0) 802 goto out; 803 804 status = ocfs2_create_local_dquot(dquot); 805 if (status < 0) 806 goto out; 807 set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 808 out: 809 mutex_unlock(&dquot->dq_lock); 810 if (status) 811 mlog_errno(status); 812 return status; 813 } 814 815 static int ocfs2_mark_dquot_dirty(struct dquot *dquot) 816 { 817 unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) | 818 (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) | 819 (1 << (DQ_LASTSET_B + QIF_INODES_B)) | 820 (1 << (DQ_LASTSET_B + QIF_SPACE_B)) | 821 (1 << (DQ_LASTSET_B + QIF_BTIME_B)) | 822 (1 << (DQ_LASTSET_B + QIF_ITIME_B)); 823 int sync = 0; 824 int status; 825 struct super_block *sb = dquot->dq_sb; 826 int type = dquot->dq_type; 827 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 828 handle_t *handle; 829 struct ocfs2_super *osb = OCFS2_SB(sb); 830 831 trace_ocfs2_mark_dquot_dirty(dquot->dq_id, type); 832 833 /* In case user set some limits, sync dquot immediately to global 834 * quota file so that information propagates quicker */ 835 spin_lock(&dq_data_lock); 836 if (dquot->dq_flags & mask) 837 sync = 1; 838 spin_unlock(&dq_data_lock); 839 /* This is a slight hack but we can't afford getting global quota 840 * lock if we already have a transaction started. */ 841 if (!sync || journal_current_handle()) { 842 status = ocfs2_write_dquot(dquot); 843 goto out; 844 } 845 status = ocfs2_lock_global_qf(oinfo, 1); 846 if (status < 0) 847 goto out; 848 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS); 849 if (IS_ERR(handle)) { 850 status = PTR_ERR(handle); 851 mlog_errno(status); 852 goto out_ilock; 853 } 854 mutex_lock(&sb_dqopt(sb)->dqio_mutex); 855 status = ocfs2_sync_dquot(dquot); 856 if (status < 0) { 857 mlog_errno(status); 858 goto out_dlock; 859 } 860 /* Now write updated local dquot structure */ 861 status = ocfs2_local_write_dquot(dquot); 862 out_dlock: 863 mutex_unlock(&sb_dqopt(sb)->dqio_mutex); 864 ocfs2_commit_trans(osb, handle); 865 out_ilock: 866 ocfs2_unlock_global_qf(oinfo, 1); 867 out: 868 if (status) 869 mlog_errno(status); 870 return status; 871 } 872 873 /* This should happen only after set_dqinfo(). */ 874 static int ocfs2_write_info(struct super_block *sb, int type) 875 { 876 handle_t *handle; 877 int status = 0; 878 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 879 880 status = ocfs2_lock_global_qf(oinfo, 1); 881 if (status < 0) 882 goto out; 883 handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS); 884 if (IS_ERR(handle)) { 885 status = PTR_ERR(handle); 886 mlog_errno(status); 887 goto out_ilock; 888 } 889 status = dquot_commit_info(sb, type); 890 ocfs2_commit_trans(OCFS2_SB(sb), handle); 891 out_ilock: 892 ocfs2_unlock_global_qf(oinfo, 1); 893 out: 894 if (status) 895 mlog_errno(status); 896 return status; 897 } 898 899 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type) 900 { 901 struct ocfs2_dquot *dquot = 902 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS); 903 904 if (!dquot) 905 return NULL; 906 return &dquot->dq_dquot; 907 } 908 909 static void ocfs2_destroy_dquot(struct dquot *dquot) 910 { 911 kmem_cache_free(ocfs2_dquot_cachep, dquot); 912 } 913 914 const struct dquot_operations ocfs2_quota_operations = { 915 /* We never make dquot dirty so .write_dquot is never called */ 916 .acquire_dquot = ocfs2_acquire_dquot, 917 .release_dquot = ocfs2_release_dquot, 918 .mark_dirty = ocfs2_mark_dquot_dirty, 919 .write_info = ocfs2_write_info, 920 .alloc_dquot = ocfs2_alloc_dquot, 921 .destroy_dquot = ocfs2_destroy_dquot, 922 }; 923