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(from_kqid(&init_user_ns, 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_id.type)->dqi_priv; 116 117 if (qtree_entry_unused(&oinfo->dqi_gi, dp)) 118 return 0; 119 120 return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type, 121 le32_to_cpu(d->dqb_id)), 122 dquot->dq_id); 123 } 124 125 struct qtree_fmt_operations ocfs2_global_ops = { 126 .mem2disk_dqblk = ocfs2_global_mem2diskdqb, 127 .disk2mem_dqblk = ocfs2_global_disk2memdqb, 128 .is_id = ocfs2_global_is_id, 129 }; 130 131 int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh) 132 { 133 struct ocfs2_disk_dqtrailer *dqt = 134 ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data); 135 136 trace_ocfs2_validate_quota_block((unsigned long long)bh->b_blocknr); 137 138 BUG_ON(!buffer_uptodate(bh)); 139 140 /* 141 * If the ecc fails, we return the error but otherwise 142 * leave the filesystem running. We know any error is 143 * local to this block. 144 */ 145 return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check); 146 } 147 148 int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block, 149 struct buffer_head **bhp) 150 { 151 int rc; 152 153 *bhp = NULL; 154 rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, 1, bhp, 0, 155 ocfs2_validate_quota_block); 156 if (rc) 157 mlog_errno(rc); 158 return rc; 159 } 160 161 /* Read data from global quotafile - avoid pagecache and such because we cannot 162 * afford acquiring the locks... We use quota cluster lock to serialize 163 * operations. Caller is responsible for acquiring it. */ 164 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data, 165 size_t len, loff_t off) 166 { 167 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 168 struct inode *gqinode = oinfo->dqi_gqinode; 169 loff_t i_size = i_size_read(gqinode); 170 int offset = off & (sb->s_blocksize - 1); 171 sector_t blk = off >> sb->s_blocksize_bits; 172 int err = 0; 173 struct buffer_head *bh; 174 size_t toread, tocopy; 175 u64 pblock = 0, pcount = 0; 176 177 if (off > i_size) 178 return 0; 179 if (off + len > i_size) 180 len = i_size - off; 181 toread = len; 182 while (toread > 0) { 183 tocopy = min_t(size_t, (sb->s_blocksize - offset), toread); 184 if (!pcount) { 185 err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, 186 &pcount, NULL); 187 if (err) { 188 mlog_errno(err); 189 return err; 190 } 191 } else { 192 pcount--; 193 pblock++; 194 } 195 bh = NULL; 196 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh); 197 if (err) { 198 mlog_errno(err); 199 return err; 200 } 201 memcpy(data, bh->b_data + offset, tocopy); 202 brelse(bh); 203 offset = 0; 204 toread -= tocopy; 205 data += tocopy; 206 blk++; 207 } 208 return len; 209 } 210 211 /* Write to quotafile (we know the transaction is already started and has 212 * enough credits) */ 213 ssize_t ocfs2_quota_write(struct super_block *sb, int type, 214 const char *data, size_t len, loff_t off) 215 { 216 struct mem_dqinfo *info = sb_dqinfo(sb, type); 217 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv; 218 struct inode *gqinode = oinfo->dqi_gqinode; 219 int offset = off & (sb->s_blocksize - 1); 220 sector_t blk = off >> sb->s_blocksize_bits; 221 int err = 0, new = 0, ja_type; 222 struct buffer_head *bh = NULL; 223 handle_t *handle = journal_current_handle(); 224 u64 pblock, pcount; 225 226 if (!handle) { 227 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled " 228 "because transaction was not started.\n", 229 (unsigned long long)off, (unsigned long long)len); 230 return -EIO; 231 } 232 if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) { 233 WARN_ON(1); 234 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset; 235 } 236 237 if (gqinode->i_size < off + len) { 238 loff_t rounded_end = 239 ocfs2_align_bytes_to_blocks(sb, off + len); 240 241 /* Space is already allocated in ocfs2_acquire_dquot() */ 242 err = ocfs2_simple_size_update(gqinode, 243 oinfo->dqi_gqi_bh, 244 rounded_end); 245 if (err < 0) 246 goto out; 247 new = 1; 248 } 249 err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, &pcount, NULL); 250 if (err) { 251 mlog_errno(err); 252 goto out; 253 } 254 /* Not rewriting whole block? */ 255 if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) && 256 !new) { 257 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh); 258 ja_type = OCFS2_JOURNAL_ACCESS_WRITE; 259 } else { 260 bh = sb_getblk(sb, pblock); 261 if (!bh) 262 err = -ENOMEM; 263 ja_type = OCFS2_JOURNAL_ACCESS_CREATE; 264 } 265 if (err) { 266 mlog_errno(err); 267 goto out; 268 } 269 lock_buffer(bh); 270 if (new) 271 memset(bh->b_data, 0, sb->s_blocksize); 272 memcpy(bh->b_data + offset, data, len); 273 flush_dcache_page(bh->b_page); 274 set_buffer_uptodate(bh); 275 unlock_buffer(bh); 276 ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh); 277 err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh, 278 ja_type); 279 if (err < 0) { 280 brelse(bh); 281 goto out; 282 } 283 ocfs2_journal_dirty(handle, bh); 284 brelse(bh); 285 out: 286 if (err) { 287 mlog_errno(err); 288 return err; 289 } 290 gqinode->i_version++; 291 ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh); 292 return len; 293 } 294 295 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex) 296 { 297 int status; 298 struct buffer_head *bh = NULL; 299 300 status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex); 301 if (status < 0) 302 return status; 303 spin_lock(&dq_data_lock); 304 if (!oinfo->dqi_gqi_count++) 305 oinfo->dqi_gqi_bh = bh; 306 else 307 WARN_ON(bh != oinfo->dqi_gqi_bh); 308 spin_unlock(&dq_data_lock); 309 if (ex) { 310 mutex_lock(&oinfo->dqi_gqinode->i_mutex); 311 down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem); 312 } else { 313 down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem); 314 } 315 return 0; 316 } 317 318 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex) 319 { 320 if (ex) { 321 up_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem); 322 mutex_unlock(&oinfo->dqi_gqinode->i_mutex); 323 } else { 324 up_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem); 325 } 326 ocfs2_inode_unlock(oinfo->dqi_gqinode, ex); 327 brelse(oinfo->dqi_gqi_bh); 328 spin_lock(&dq_data_lock); 329 if (!--oinfo->dqi_gqi_count) 330 oinfo->dqi_gqi_bh = NULL; 331 spin_unlock(&dq_data_lock); 332 } 333 334 /* Read information header from global quota file */ 335 int ocfs2_global_read_info(struct super_block *sb, int type) 336 { 337 struct inode *gqinode = NULL; 338 unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE, 339 GROUP_QUOTA_SYSTEM_INODE }; 340 struct ocfs2_global_disk_dqinfo dinfo; 341 struct mem_dqinfo *info = sb_dqinfo(sb, type); 342 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv; 343 u64 pcount; 344 int status; 345 346 /* Read global header */ 347 gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type], 348 OCFS2_INVALID_SLOT); 349 if (!gqinode) { 350 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n", 351 type); 352 status = -EINVAL; 353 goto out_err; 354 } 355 oinfo->dqi_gi.dqi_sb = sb; 356 oinfo->dqi_gi.dqi_type = type; 357 ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo); 358 oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk); 359 oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops; 360 oinfo->dqi_gqi_bh = NULL; 361 oinfo->dqi_gqi_count = 0; 362 oinfo->dqi_gqinode = gqinode; 363 status = ocfs2_lock_global_qf(oinfo, 0); 364 if (status < 0) { 365 mlog_errno(status); 366 goto out_err; 367 } 368 369 status = ocfs2_extent_map_get_blocks(gqinode, 0, &oinfo->dqi_giblk, 370 &pcount, NULL); 371 if (status < 0) 372 goto out_unlock; 373 374 status = ocfs2_qinfo_lock(oinfo, 0); 375 if (status < 0) 376 goto out_unlock; 377 status = sb->s_op->quota_read(sb, type, (char *)&dinfo, 378 sizeof(struct ocfs2_global_disk_dqinfo), 379 OCFS2_GLOBAL_INFO_OFF); 380 ocfs2_qinfo_unlock(oinfo, 0); 381 ocfs2_unlock_global_qf(oinfo, 0); 382 if (status != sizeof(struct ocfs2_global_disk_dqinfo)) { 383 mlog(ML_ERROR, "Cannot read global quota info (%d).\n", 384 status); 385 if (status >= 0) 386 status = -EIO; 387 mlog_errno(status); 388 goto out_err; 389 } 390 info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace); 391 info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace); 392 oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms); 393 oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks); 394 oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk); 395 oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry); 396 oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits; 397 oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize - 398 OCFS2_QBLK_RESERVED_SPACE; 399 oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi); 400 INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn); 401 schedule_delayed_work(&oinfo->dqi_sync_work, 402 msecs_to_jiffies(oinfo->dqi_syncms)); 403 404 out_err: 405 return status; 406 out_unlock: 407 ocfs2_unlock_global_qf(oinfo, 0); 408 mlog_errno(status); 409 goto out_err; 410 } 411 412 /* Write information to global quota file. Expects exlusive lock on quota 413 * file inode and quota info */ 414 static int __ocfs2_global_write_info(struct super_block *sb, int type) 415 { 416 struct mem_dqinfo *info = sb_dqinfo(sb, type); 417 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv; 418 struct ocfs2_global_disk_dqinfo dinfo; 419 ssize_t size; 420 421 spin_lock(&dq_data_lock); 422 info->dqi_flags &= ~DQF_INFO_DIRTY; 423 dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace); 424 dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace); 425 spin_unlock(&dq_data_lock); 426 dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms); 427 dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks); 428 dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk); 429 dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry); 430 size = sb->s_op->quota_write(sb, type, (char *)&dinfo, 431 sizeof(struct ocfs2_global_disk_dqinfo), 432 OCFS2_GLOBAL_INFO_OFF); 433 if (size != sizeof(struct ocfs2_global_disk_dqinfo)) { 434 mlog(ML_ERROR, "Cannot write global quota info structure\n"); 435 if (size >= 0) 436 size = -EIO; 437 return size; 438 } 439 return 0; 440 } 441 442 int ocfs2_global_write_info(struct super_block *sb, int type) 443 { 444 int err; 445 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv; 446 447 err = ocfs2_qinfo_lock(info, 1); 448 if (err < 0) 449 return err; 450 err = __ocfs2_global_write_info(sb, type); 451 ocfs2_qinfo_unlock(info, 1); 452 return err; 453 } 454 455 static int ocfs2_global_qinit_alloc(struct super_block *sb, int type) 456 { 457 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 458 459 /* 460 * We may need to allocate tree blocks and a leaf block but not the 461 * root block 462 */ 463 return oinfo->dqi_gi.dqi_qtree_depth; 464 } 465 466 static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type) 467 { 468 /* We modify all the allocated blocks, tree root, info block and 469 * the inode */ 470 return (ocfs2_global_qinit_alloc(sb, type) + 2) * 471 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1; 472 } 473 474 /* Sync local information about quota modifications with global quota file. 475 * Caller must have started the transaction and obtained exclusive lock for 476 * global quota file inode */ 477 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing) 478 { 479 int err, err2; 480 struct super_block *sb = dquot->dq_sb; 481 int type = dquot->dq_id.type; 482 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv; 483 struct ocfs2_global_disk_dqblk dqblk; 484 s64 spacechange, inodechange; 485 time_t olditime, oldbtime; 486 487 err = sb->s_op->quota_read(sb, type, (char *)&dqblk, 488 sizeof(struct ocfs2_global_disk_dqblk), 489 dquot->dq_off); 490 if (err != sizeof(struct ocfs2_global_disk_dqblk)) { 491 if (err >= 0) { 492 mlog(ML_ERROR, "Short read from global quota file " 493 "(%u read)\n", err); 494 err = -EIO; 495 } 496 goto out; 497 } 498 499 /* Update space and inode usage. Get also other information from 500 * global quota file so that we don't overwrite any changes there. 501 * We are */ 502 spin_lock(&dq_data_lock); 503 spacechange = dquot->dq_dqb.dqb_curspace - 504 OCFS2_DQUOT(dquot)->dq_origspace; 505 inodechange = dquot->dq_dqb.dqb_curinodes - 506 OCFS2_DQUOT(dquot)->dq_originodes; 507 olditime = dquot->dq_dqb.dqb_itime; 508 oldbtime = dquot->dq_dqb.dqb_btime; 509 ocfs2_global_disk2memdqb(dquot, &dqblk); 510 trace_ocfs2_sync_dquot(from_kqid(&init_user_ns, dquot->dq_id), 511 dquot->dq_dqb.dqb_curspace, 512 (long long)spacechange, 513 dquot->dq_dqb.dqb_curinodes, 514 (long long)inodechange); 515 if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags)) 516 dquot->dq_dqb.dqb_curspace += spacechange; 517 if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags)) 518 dquot->dq_dqb.dqb_curinodes += inodechange; 519 /* Set properly space grace time... */ 520 if (dquot->dq_dqb.dqb_bsoftlimit && 521 dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) { 522 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) && 523 oldbtime > 0) { 524 if (dquot->dq_dqb.dqb_btime > 0) 525 dquot->dq_dqb.dqb_btime = 526 min(dquot->dq_dqb.dqb_btime, oldbtime); 527 else 528 dquot->dq_dqb.dqb_btime = oldbtime; 529 } 530 } else { 531 dquot->dq_dqb.dqb_btime = 0; 532 clear_bit(DQ_BLKS_B, &dquot->dq_flags); 533 } 534 /* Set properly inode grace time... */ 535 if (dquot->dq_dqb.dqb_isoftlimit && 536 dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) { 537 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) && 538 olditime > 0) { 539 if (dquot->dq_dqb.dqb_itime > 0) 540 dquot->dq_dqb.dqb_itime = 541 min(dquot->dq_dqb.dqb_itime, olditime); 542 else 543 dquot->dq_dqb.dqb_itime = olditime; 544 } 545 } else { 546 dquot->dq_dqb.dqb_itime = 0; 547 clear_bit(DQ_INODES_B, &dquot->dq_flags); 548 } 549 /* All information is properly updated, clear the flags */ 550 __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 551 __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 552 __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 553 __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 554 __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 555 __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 556 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace; 557 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes; 558 spin_unlock(&dq_data_lock); 559 err = ocfs2_qinfo_lock(info, freeing); 560 if (err < 0) { 561 mlog(ML_ERROR, "Failed to lock quota info, losing quota write" 562 " (type=%d, id=%u)\n", dquot->dq_id.type, 563 (unsigned)from_kqid(&init_user_ns, dquot->dq_id)); 564 goto out; 565 } 566 if (freeing) 567 OCFS2_DQUOT(dquot)->dq_use_count--; 568 err = qtree_write_dquot(&info->dqi_gi, dquot); 569 if (err < 0) 570 goto out_qlock; 571 if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) { 572 err = qtree_release_dquot(&info->dqi_gi, dquot); 573 if (info_dirty(sb_dqinfo(sb, type))) { 574 err2 = __ocfs2_global_write_info(sb, type); 575 if (!err) 576 err = err2; 577 } 578 } 579 out_qlock: 580 ocfs2_qinfo_unlock(info, freeing); 581 out: 582 if (err < 0) 583 mlog_errno(err); 584 return err; 585 } 586 587 /* 588 * Functions for periodic syncing of dquots with global file 589 */ 590 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type) 591 { 592 handle_t *handle; 593 struct super_block *sb = dquot->dq_sb; 594 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 595 struct ocfs2_super *osb = OCFS2_SB(sb); 596 int status = 0; 597 598 trace_ocfs2_sync_dquot_helper(from_kqid(&init_user_ns, dquot->dq_id), 599 dquot->dq_id.type, 600 type, sb->s_id); 601 if (type != dquot->dq_id.type) 602 goto out; 603 status = ocfs2_lock_global_qf(oinfo, 1); 604 if (status < 0) 605 goto out; 606 607 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS); 608 if (IS_ERR(handle)) { 609 status = PTR_ERR(handle); 610 mlog_errno(status); 611 goto out_ilock; 612 } 613 mutex_lock(&sb_dqopt(sb)->dqio_mutex); 614 status = ocfs2_sync_dquot(dquot); 615 if (status < 0) 616 mlog_errno(status); 617 /* We have to write local structure as well... */ 618 status = ocfs2_local_write_dquot(dquot); 619 if (status < 0) 620 mlog_errno(status); 621 mutex_unlock(&sb_dqopt(sb)->dqio_mutex); 622 ocfs2_commit_trans(osb, handle); 623 out_ilock: 624 ocfs2_unlock_global_qf(oinfo, 1); 625 out: 626 return status; 627 } 628 629 static void qsync_work_fn(struct work_struct *work) 630 { 631 struct ocfs2_mem_dqinfo *oinfo = container_of(work, 632 struct ocfs2_mem_dqinfo, 633 dqi_sync_work.work); 634 struct super_block *sb = oinfo->dqi_gqinode->i_sb; 635 636 dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type); 637 schedule_delayed_work(&oinfo->dqi_sync_work, 638 msecs_to_jiffies(oinfo->dqi_syncms)); 639 } 640 641 /* 642 * Wrappers for generic quota functions 643 */ 644 645 static int ocfs2_write_dquot(struct dquot *dquot) 646 { 647 handle_t *handle; 648 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb); 649 int status = 0; 650 651 trace_ocfs2_write_dquot(from_kqid(&init_user_ns, dquot->dq_id), 652 dquot->dq_id.type); 653 654 handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS); 655 if (IS_ERR(handle)) { 656 status = PTR_ERR(handle); 657 mlog_errno(status); 658 goto out; 659 } 660 mutex_lock(&sb_dqopt(dquot->dq_sb)->dqio_mutex); 661 status = ocfs2_local_write_dquot(dquot); 662 mutex_unlock(&sb_dqopt(dquot->dq_sb)->dqio_mutex); 663 ocfs2_commit_trans(osb, handle); 664 out: 665 return status; 666 } 667 668 static int ocfs2_calc_qdel_credits(struct super_block *sb, int type) 669 { 670 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 671 /* 672 * We modify tree, leaf block, global info, local chunk header, 673 * global and local inode; OCFS2_QINFO_WRITE_CREDITS already 674 * accounts for inode update 675 */ 676 return (oinfo->dqi_gi.dqi_qtree_depth + 2) * 677 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 678 OCFS2_QINFO_WRITE_CREDITS + 679 OCFS2_INODE_UPDATE_CREDITS; 680 } 681 682 static int ocfs2_release_dquot(struct dquot *dquot) 683 { 684 handle_t *handle; 685 struct ocfs2_mem_dqinfo *oinfo = 686 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; 687 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb); 688 int status = 0; 689 690 trace_ocfs2_release_dquot(from_kqid(&init_user_ns, dquot->dq_id), 691 dquot->dq_id.type); 692 693 mutex_lock(&dquot->dq_lock); 694 /* Check whether we are not racing with some other dqget() */ 695 if (atomic_read(&dquot->dq_count) > 1) 696 goto out; 697 status = ocfs2_lock_global_qf(oinfo, 1); 698 if (status < 0) 699 goto out; 700 handle = ocfs2_start_trans(osb, 701 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_id.type)); 702 if (IS_ERR(handle)) { 703 status = PTR_ERR(handle); 704 mlog_errno(status); 705 goto out_ilock; 706 } 707 708 status = ocfs2_global_release_dquot(dquot); 709 if (status < 0) { 710 mlog_errno(status); 711 goto out_trans; 712 } 713 status = ocfs2_local_release_dquot(handle, dquot); 714 /* 715 * If we fail here, we cannot do much as global structure is 716 * already released. So just complain... 717 */ 718 if (status < 0) 719 mlog_errno(status); 720 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 721 out_trans: 722 ocfs2_commit_trans(osb, handle); 723 out_ilock: 724 ocfs2_unlock_global_qf(oinfo, 1); 725 out: 726 mutex_unlock(&dquot->dq_lock); 727 if (status) 728 mlog_errno(status); 729 return status; 730 } 731 732 /* 733 * Read global dquot structure from disk or create it if it does 734 * not exist. Also update use count of the global structure and 735 * create structure in node-local quota file. 736 */ 737 static int ocfs2_acquire_dquot(struct dquot *dquot) 738 { 739 int status = 0, err; 740 int ex = 0; 741 struct super_block *sb = dquot->dq_sb; 742 struct ocfs2_super *osb = OCFS2_SB(sb); 743 int type = dquot->dq_id.type; 744 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv; 745 struct inode *gqinode = info->dqi_gqinode; 746 int need_alloc = ocfs2_global_qinit_alloc(sb, type); 747 handle_t *handle; 748 749 trace_ocfs2_acquire_dquot(from_kqid(&init_user_ns, dquot->dq_id), 750 type); 751 mutex_lock(&dquot->dq_lock); 752 /* 753 * We need an exclusive lock, because we're going to update use count 754 * and instantiate possibly new dquot structure 755 */ 756 status = ocfs2_lock_global_qf(info, 1); 757 if (status < 0) 758 goto out; 759 if (!test_bit(DQ_READ_B, &dquot->dq_flags)) { 760 status = ocfs2_qinfo_lock(info, 0); 761 if (status < 0) 762 goto out_dq; 763 status = qtree_read_dquot(&info->dqi_gi, dquot); 764 ocfs2_qinfo_unlock(info, 0); 765 if (status < 0) 766 goto out_dq; 767 } 768 set_bit(DQ_READ_B, &dquot->dq_flags); 769 770 OCFS2_DQUOT(dquot)->dq_use_count++; 771 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace; 772 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes; 773 if (!dquot->dq_off) { /* No real quota entry? */ 774 ex = 1; 775 /* 776 * Add blocks to quota file before we start a transaction since 777 * locking allocators ranks above a transaction start 778 */ 779 WARN_ON(journal_current_handle()); 780 status = ocfs2_extend_no_holes(gqinode, NULL, 781 gqinode->i_size + (need_alloc << sb->s_blocksize_bits), 782 gqinode->i_size); 783 if (status < 0) 784 goto out_dq; 785 } 786 787 handle = ocfs2_start_trans(osb, 788 ocfs2_calc_global_qinit_credits(sb, type)); 789 if (IS_ERR(handle)) { 790 status = PTR_ERR(handle); 791 goto out_dq; 792 } 793 status = ocfs2_qinfo_lock(info, ex); 794 if (status < 0) 795 goto out_trans; 796 status = qtree_write_dquot(&info->dqi_gi, dquot); 797 if (ex && info_dirty(sb_dqinfo(sb, type))) { 798 err = __ocfs2_global_write_info(sb, type); 799 if (!status) 800 status = err; 801 } 802 ocfs2_qinfo_unlock(info, ex); 803 out_trans: 804 ocfs2_commit_trans(osb, handle); 805 out_dq: 806 ocfs2_unlock_global_qf(info, 1); 807 if (status < 0) 808 goto out; 809 810 status = ocfs2_create_local_dquot(dquot); 811 if (status < 0) 812 goto out; 813 set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 814 out: 815 mutex_unlock(&dquot->dq_lock); 816 if (status) 817 mlog_errno(status); 818 return status; 819 } 820 821 static int ocfs2_mark_dquot_dirty(struct dquot *dquot) 822 { 823 unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) | 824 (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) | 825 (1 << (DQ_LASTSET_B + QIF_INODES_B)) | 826 (1 << (DQ_LASTSET_B + QIF_SPACE_B)) | 827 (1 << (DQ_LASTSET_B + QIF_BTIME_B)) | 828 (1 << (DQ_LASTSET_B + QIF_ITIME_B)); 829 int sync = 0; 830 int status; 831 struct super_block *sb = dquot->dq_sb; 832 int type = dquot->dq_id.type; 833 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 834 handle_t *handle; 835 struct ocfs2_super *osb = OCFS2_SB(sb); 836 837 trace_ocfs2_mark_dquot_dirty(from_kqid(&init_user_ns, dquot->dq_id), 838 type); 839 840 /* In case user set some limits, sync dquot immediately to global 841 * quota file so that information propagates quicker */ 842 spin_lock(&dq_data_lock); 843 if (dquot->dq_flags & mask) 844 sync = 1; 845 spin_unlock(&dq_data_lock); 846 /* This is a slight hack but we can't afford getting global quota 847 * lock if we already have a transaction started. */ 848 if (!sync || journal_current_handle()) { 849 status = ocfs2_write_dquot(dquot); 850 goto out; 851 } 852 status = ocfs2_lock_global_qf(oinfo, 1); 853 if (status < 0) 854 goto out; 855 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS); 856 if (IS_ERR(handle)) { 857 status = PTR_ERR(handle); 858 mlog_errno(status); 859 goto out_ilock; 860 } 861 mutex_lock(&sb_dqopt(sb)->dqio_mutex); 862 status = ocfs2_sync_dquot(dquot); 863 if (status < 0) { 864 mlog_errno(status); 865 goto out_dlock; 866 } 867 /* Now write updated local dquot structure */ 868 status = ocfs2_local_write_dquot(dquot); 869 out_dlock: 870 mutex_unlock(&sb_dqopt(sb)->dqio_mutex); 871 ocfs2_commit_trans(osb, handle); 872 out_ilock: 873 ocfs2_unlock_global_qf(oinfo, 1); 874 out: 875 if (status) 876 mlog_errno(status); 877 return status; 878 } 879 880 /* This should happen only after set_dqinfo(). */ 881 static int ocfs2_write_info(struct super_block *sb, int type) 882 { 883 handle_t *handle; 884 int status = 0; 885 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 886 887 status = ocfs2_lock_global_qf(oinfo, 1); 888 if (status < 0) 889 goto out; 890 handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS); 891 if (IS_ERR(handle)) { 892 status = PTR_ERR(handle); 893 mlog_errno(status); 894 goto out_ilock; 895 } 896 status = dquot_commit_info(sb, type); 897 ocfs2_commit_trans(OCFS2_SB(sb), handle); 898 out_ilock: 899 ocfs2_unlock_global_qf(oinfo, 1); 900 out: 901 if (status) 902 mlog_errno(status); 903 return status; 904 } 905 906 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type) 907 { 908 struct ocfs2_dquot *dquot = 909 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS); 910 911 if (!dquot) 912 return NULL; 913 return &dquot->dq_dquot; 914 } 915 916 static void ocfs2_destroy_dquot(struct dquot *dquot) 917 { 918 kmem_cache_free(ocfs2_dquot_cachep, dquot); 919 } 920 921 const struct dquot_operations ocfs2_quota_operations = { 922 /* We never make dquot dirty so .write_dquot is never called */ 923 .acquire_dquot = ocfs2_acquire_dquot, 924 .release_dquot = ocfs2_release_dquot, 925 .mark_dirty = ocfs2_mark_dquot_dirty, 926 .write_info = ocfs2_write_info, 927 .alloc_dquot = ocfs2_alloc_dquot, 928 .destroy_dquot = ocfs2_destroy_dquot, 929 }; 930