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 #include <linux/llist.h> 14 15 #include <cluster/masklog.h> 16 17 #include "ocfs2_fs.h" 18 #include "ocfs2.h" 19 #include "alloc.h" 20 #include "blockcheck.h" 21 #include "inode.h" 22 #include "journal.h" 23 #include "file.h" 24 #include "sysfile.h" 25 #include "dlmglue.h" 26 #include "uptodate.h" 27 #include "super.h" 28 #include "buffer_head_io.h" 29 #include "quota.h" 30 #include "ocfs2_trace.h" 31 32 /* 33 * Locking of quotas with OCFS2 is rather complex. Here are rules that 34 * should be obeyed by all the functions: 35 * - any write of quota structure (either to local or global file) is protected 36 * by dqio_mutex or dquot->dq_lock. 37 * - any modification of global quota file holds inode cluster lock, i_mutex, 38 * and ip_alloc_sem of the global quota file (achieved by 39 * ocfs2_lock_global_qf). It also has to hold qinfo_lock. 40 * - an allocation of new blocks for local quota file is protected by 41 * its ip_alloc_sem 42 * 43 * A rough sketch of locking dependencies (lf = local file, gf = global file): 44 * Normal filesystem operation: 45 * start_trans -> dqio_mutex -> write to lf 46 * Syncing of local and global file: 47 * ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock -> 48 * write to gf 49 * -> write to lf 50 * Acquire dquot for the first time: 51 * dq_lock -> ocfs2_lock_global_qf -> qinfo_lock -> read from gf 52 * -> alloc space for gf 53 * -> start_trans -> qinfo_lock -> write to gf 54 * -> ip_alloc_sem of lf -> alloc space for lf 55 * -> write to lf 56 * Release last reference to dquot: 57 * dq_lock -> ocfs2_lock_global_qf -> start_trans -> qinfo_lock -> write to gf 58 * -> write to lf 59 * Note that all the above operations also hold the inode cluster lock of lf. 60 * Recovery: 61 * inode cluster lock of recovered lf 62 * -> read bitmaps -> ip_alloc_sem of lf 63 * -> ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock -> 64 * write to gf 65 */ 66 67 static void qsync_work_fn(struct work_struct *work); 68 69 static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp) 70 { 71 struct ocfs2_global_disk_dqblk *d = dp; 72 struct mem_dqblk *m = &dquot->dq_dqb; 73 74 /* Update from disk only entries not set by the admin */ 75 if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) { 76 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit); 77 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit); 78 } 79 if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags)) 80 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes); 81 if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) { 82 m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit); 83 m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit); 84 } 85 if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags)) 86 m->dqb_curspace = le64_to_cpu(d->dqb_curspace); 87 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags)) 88 m->dqb_btime = le64_to_cpu(d->dqb_btime); 89 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags)) 90 m->dqb_itime = le64_to_cpu(d->dqb_itime); 91 OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count); 92 } 93 94 static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot) 95 { 96 struct ocfs2_global_disk_dqblk *d = dp; 97 struct mem_dqblk *m = &dquot->dq_dqb; 98 99 d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id)); 100 d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count); 101 d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit); 102 d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit); 103 d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes); 104 d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit); 105 d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit); 106 d->dqb_curspace = cpu_to_le64(m->dqb_curspace); 107 d->dqb_btime = cpu_to_le64(m->dqb_btime); 108 d->dqb_itime = cpu_to_le64(m->dqb_itime); 109 d->dqb_pad1 = d->dqb_pad2 = 0; 110 } 111 112 static int ocfs2_global_is_id(void *dp, struct dquot *dquot) 113 { 114 struct ocfs2_global_disk_dqblk *d = dp; 115 struct ocfs2_mem_dqinfo *oinfo = 116 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; 117 118 if (qtree_entry_unused(&oinfo->dqi_gi, dp)) 119 return 0; 120 121 return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type, 122 le32_to_cpu(d->dqb_id)), 123 dquot->dq_id); 124 } 125 126 struct qtree_fmt_operations ocfs2_global_ops = { 127 .mem2disk_dqblk = ocfs2_global_mem2diskdqb, 128 .disk2mem_dqblk = ocfs2_global_disk2memdqb, 129 .is_id = ocfs2_global_is_id, 130 }; 131 132 int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh) 133 { 134 struct ocfs2_disk_dqtrailer *dqt = 135 ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data); 136 137 trace_ocfs2_validate_quota_block((unsigned long long)bh->b_blocknr); 138 139 BUG_ON(!buffer_uptodate(bh)); 140 141 /* 142 * If the ecc fails, we return the error but otherwise 143 * leave the filesystem running. We know any error is 144 * local to this block. 145 */ 146 return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check); 147 } 148 149 int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block, 150 struct buffer_head **bhp) 151 { 152 int rc; 153 154 *bhp = NULL; 155 rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, 1, bhp, 0, 156 ocfs2_validate_quota_block); 157 if (rc) 158 mlog_errno(rc); 159 return rc; 160 } 161 162 /* Read data from global quotafile - avoid pagecache and such because we cannot 163 * afford acquiring the locks... We use quota cluster lock to serialize 164 * operations. Caller is responsible for acquiring it. */ 165 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data, 166 size_t len, loff_t off) 167 { 168 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 169 struct inode *gqinode = oinfo->dqi_gqinode; 170 loff_t i_size = i_size_read(gqinode); 171 int offset = off & (sb->s_blocksize - 1); 172 sector_t blk = off >> sb->s_blocksize_bits; 173 int err = 0; 174 struct buffer_head *bh; 175 size_t toread, tocopy; 176 u64 pblock = 0, pcount = 0; 177 178 if (off > i_size) 179 return 0; 180 if (off + len > i_size) 181 len = i_size - off; 182 toread = len; 183 while (toread > 0) { 184 tocopy = min_t(size_t, (sb->s_blocksize - offset), toread); 185 if (!pcount) { 186 err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, 187 &pcount, NULL); 188 if (err) { 189 mlog_errno(err); 190 return err; 191 } 192 } else { 193 pcount--; 194 pblock++; 195 } 196 bh = NULL; 197 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh); 198 if (err) { 199 mlog_errno(err); 200 return err; 201 } 202 memcpy(data, bh->b_data + offset, tocopy); 203 brelse(bh); 204 offset = 0; 205 toread -= tocopy; 206 data += tocopy; 207 blk++; 208 } 209 return len; 210 } 211 212 /* Write to quotafile (we know the transaction is already started and has 213 * enough credits) */ 214 ssize_t ocfs2_quota_write(struct super_block *sb, int type, 215 const char *data, size_t len, loff_t off) 216 { 217 struct mem_dqinfo *info = sb_dqinfo(sb, type); 218 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv; 219 struct inode *gqinode = oinfo->dqi_gqinode; 220 int offset = off & (sb->s_blocksize - 1); 221 sector_t blk = off >> sb->s_blocksize_bits; 222 int err = 0, new = 0, ja_type; 223 struct buffer_head *bh = NULL; 224 handle_t *handle = journal_current_handle(); 225 u64 pblock, pcount; 226 227 if (!handle) { 228 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled " 229 "because transaction was not started.\n", 230 (unsigned long long)off, (unsigned long long)len); 231 return -EIO; 232 } 233 if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) { 234 WARN_ON(1); 235 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset; 236 } 237 238 if (i_size_read(gqinode) < off + len) { 239 loff_t rounded_end = 240 ocfs2_align_bytes_to_blocks(sb, off + len); 241 242 /* Space is already allocated in ocfs2_acquire_dquot() */ 243 err = ocfs2_simple_size_update(gqinode, 244 oinfo->dqi_gqi_bh, 245 rounded_end); 246 if (err < 0) 247 goto out; 248 new = 1; 249 } 250 err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, &pcount, NULL); 251 if (err) { 252 mlog_errno(err); 253 goto out; 254 } 255 /* Not rewriting whole block? */ 256 if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) && 257 !new) { 258 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh); 259 ja_type = OCFS2_JOURNAL_ACCESS_WRITE; 260 } else { 261 bh = sb_getblk(sb, pblock); 262 if (!bh) 263 err = -ENOMEM; 264 ja_type = OCFS2_JOURNAL_ACCESS_CREATE; 265 } 266 if (err) { 267 mlog_errno(err); 268 goto out; 269 } 270 lock_buffer(bh); 271 if (new) 272 memset(bh->b_data, 0, sb->s_blocksize); 273 memcpy(bh->b_data + offset, data, len); 274 flush_dcache_page(bh->b_page); 275 set_buffer_uptodate(bh); 276 unlock_buffer(bh); 277 ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh); 278 err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh, 279 ja_type); 280 if (err < 0) { 281 brelse(bh); 282 goto out; 283 } 284 ocfs2_journal_dirty(handle, bh); 285 brelse(bh); 286 out: 287 if (err) { 288 mlog_errno(err); 289 return err; 290 } 291 gqinode->i_version++; 292 ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh); 293 return len; 294 } 295 296 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex) 297 { 298 int status; 299 struct buffer_head *bh = NULL; 300 301 status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex); 302 if (status < 0) 303 return status; 304 spin_lock(&dq_data_lock); 305 if (!oinfo->dqi_gqi_count++) 306 oinfo->dqi_gqi_bh = bh; 307 else 308 WARN_ON(bh != oinfo->dqi_gqi_bh); 309 spin_unlock(&dq_data_lock); 310 if (ex) { 311 mutex_lock(&oinfo->dqi_gqinode->i_mutex); 312 down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem); 313 } else { 314 down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem); 315 } 316 return 0; 317 } 318 319 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex) 320 { 321 if (ex) { 322 up_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem); 323 mutex_unlock(&oinfo->dqi_gqinode->i_mutex); 324 } else { 325 up_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem); 326 } 327 ocfs2_inode_unlock(oinfo->dqi_gqinode, ex); 328 brelse(oinfo->dqi_gqi_bh); 329 spin_lock(&dq_data_lock); 330 if (!--oinfo->dqi_gqi_count) 331 oinfo->dqi_gqi_bh = NULL; 332 spin_unlock(&dq_data_lock); 333 } 334 335 /* Read information header from global quota file */ 336 int ocfs2_global_read_info(struct super_block *sb, int type) 337 { 338 struct inode *gqinode = NULL; 339 unsigned int ino[OCFS2_MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE, 340 GROUP_QUOTA_SYSTEM_INODE }; 341 struct ocfs2_global_disk_dqinfo dinfo; 342 struct mem_dqinfo *info = sb_dqinfo(sb, type); 343 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv; 344 u64 pcount; 345 int status; 346 347 /* Read global header */ 348 gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type], 349 OCFS2_INVALID_SLOT); 350 if (!gqinode) { 351 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n", 352 type); 353 status = -EINVAL; 354 goto out_err; 355 } 356 oinfo->dqi_gi.dqi_sb = sb; 357 oinfo->dqi_gi.dqi_type = type; 358 ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo); 359 oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk); 360 oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops; 361 oinfo->dqi_gqi_bh = NULL; 362 oinfo->dqi_gqi_count = 0; 363 oinfo->dqi_gqinode = gqinode; 364 status = ocfs2_lock_global_qf(oinfo, 0); 365 if (status < 0) { 366 mlog_errno(status); 367 goto out_err; 368 } 369 370 status = ocfs2_extent_map_get_blocks(gqinode, 0, &oinfo->dqi_giblk, 371 &pcount, NULL); 372 if (status < 0) 373 goto out_unlock; 374 375 status = ocfs2_qinfo_lock(oinfo, 0); 376 if (status < 0) 377 goto out_unlock; 378 status = sb->s_op->quota_read(sb, type, (char *)&dinfo, 379 sizeof(struct ocfs2_global_disk_dqinfo), 380 OCFS2_GLOBAL_INFO_OFF); 381 ocfs2_qinfo_unlock(oinfo, 0); 382 ocfs2_unlock_global_qf(oinfo, 0); 383 if (status != sizeof(struct ocfs2_global_disk_dqinfo)) { 384 mlog(ML_ERROR, "Cannot read global quota info (%d).\n", 385 status); 386 if (status >= 0) 387 status = -EIO; 388 mlog_errno(status); 389 goto out_err; 390 } 391 info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace); 392 info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace); 393 oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms); 394 oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks); 395 oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk); 396 oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry); 397 oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits; 398 oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize - 399 OCFS2_QBLK_RESERVED_SPACE; 400 oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi); 401 INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn); 402 schedule_delayed_work(&oinfo->dqi_sync_work, 403 msecs_to_jiffies(oinfo->dqi_syncms)); 404 405 out_err: 406 return status; 407 out_unlock: 408 ocfs2_unlock_global_qf(oinfo, 0); 409 mlog_errno(status); 410 goto out_err; 411 } 412 413 /* Write information to global quota file. Expects exlusive lock on quota 414 * file inode and quota info */ 415 static int __ocfs2_global_write_info(struct super_block *sb, int type) 416 { 417 struct mem_dqinfo *info = sb_dqinfo(sb, type); 418 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv; 419 struct ocfs2_global_disk_dqinfo dinfo; 420 ssize_t size; 421 422 spin_lock(&dq_data_lock); 423 info->dqi_flags &= ~DQF_INFO_DIRTY; 424 dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace); 425 dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace); 426 spin_unlock(&dq_data_lock); 427 dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms); 428 dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks); 429 dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk); 430 dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry); 431 size = sb->s_op->quota_write(sb, type, (char *)&dinfo, 432 sizeof(struct ocfs2_global_disk_dqinfo), 433 OCFS2_GLOBAL_INFO_OFF); 434 if (size != sizeof(struct ocfs2_global_disk_dqinfo)) { 435 mlog(ML_ERROR, "Cannot write global quota info structure\n"); 436 if (size >= 0) 437 size = -EIO; 438 return size; 439 } 440 return 0; 441 } 442 443 int ocfs2_global_write_info(struct super_block *sb, int type) 444 { 445 int err; 446 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv; 447 448 err = ocfs2_qinfo_lock(info, 1); 449 if (err < 0) 450 return err; 451 err = __ocfs2_global_write_info(sb, type); 452 ocfs2_qinfo_unlock(info, 1); 453 return err; 454 } 455 456 static int ocfs2_global_qinit_alloc(struct super_block *sb, int type) 457 { 458 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 459 460 /* 461 * We may need to allocate tree blocks and a leaf block but not the 462 * root block 463 */ 464 return oinfo->dqi_gi.dqi_qtree_depth; 465 } 466 467 static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type) 468 { 469 /* We modify all the allocated blocks, tree root, info block and 470 * the inode */ 471 return (ocfs2_global_qinit_alloc(sb, type) + 2) * 472 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1; 473 } 474 475 /* Sync local information about quota modifications with global quota file. 476 * Caller must have started the transaction and obtained exclusive lock for 477 * global quota file inode */ 478 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing) 479 { 480 int err, err2; 481 struct super_block *sb = dquot->dq_sb; 482 int type = dquot->dq_id.type; 483 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv; 484 struct ocfs2_global_disk_dqblk dqblk; 485 s64 spacechange, inodechange; 486 time_t olditime, oldbtime; 487 488 err = sb->s_op->quota_read(sb, type, (char *)&dqblk, 489 sizeof(struct ocfs2_global_disk_dqblk), 490 dquot->dq_off); 491 if (err != sizeof(struct ocfs2_global_disk_dqblk)) { 492 if (err >= 0) { 493 mlog(ML_ERROR, "Short read from global quota file " 494 "(%u read)\n", err); 495 err = -EIO; 496 } 497 goto out; 498 } 499 500 /* Update space and inode usage. Get also other information from 501 * global quota file so that we don't overwrite any changes there. 502 * We are */ 503 spin_lock(&dq_data_lock); 504 spacechange = dquot->dq_dqb.dqb_curspace - 505 OCFS2_DQUOT(dquot)->dq_origspace; 506 inodechange = dquot->dq_dqb.dqb_curinodes - 507 OCFS2_DQUOT(dquot)->dq_originodes; 508 olditime = dquot->dq_dqb.dqb_itime; 509 oldbtime = dquot->dq_dqb.dqb_btime; 510 ocfs2_global_disk2memdqb(dquot, &dqblk); 511 trace_ocfs2_sync_dquot(from_kqid(&init_user_ns, dquot->dq_id), 512 dquot->dq_dqb.dqb_curspace, 513 (long long)spacechange, 514 dquot->dq_dqb.dqb_curinodes, 515 (long long)inodechange); 516 if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags)) 517 dquot->dq_dqb.dqb_curspace += spacechange; 518 if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags)) 519 dquot->dq_dqb.dqb_curinodes += inodechange; 520 /* Set properly space grace time... */ 521 if (dquot->dq_dqb.dqb_bsoftlimit && 522 dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) { 523 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) && 524 oldbtime > 0) { 525 if (dquot->dq_dqb.dqb_btime > 0) 526 dquot->dq_dqb.dqb_btime = 527 min(dquot->dq_dqb.dqb_btime, oldbtime); 528 else 529 dquot->dq_dqb.dqb_btime = oldbtime; 530 } 531 } else { 532 dquot->dq_dqb.dqb_btime = 0; 533 clear_bit(DQ_BLKS_B, &dquot->dq_flags); 534 } 535 /* Set properly inode grace time... */ 536 if (dquot->dq_dqb.dqb_isoftlimit && 537 dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) { 538 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) && 539 olditime > 0) { 540 if (dquot->dq_dqb.dqb_itime > 0) 541 dquot->dq_dqb.dqb_itime = 542 min(dquot->dq_dqb.dqb_itime, olditime); 543 else 544 dquot->dq_dqb.dqb_itime = olditime; 545 } 546 } else { 547 dquot->dq_dqb.dqb_itime = 0; 548 clear_bit(DQ_INODES_B, &dquot->dq_flags); 549 } 550 /* All information is properly updated, clear the flags */ 551 __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 552 __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 553 __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 554 __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 555 __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 556 __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 557 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace; 558 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes; 559 spin_unlock(&dq_data_lock); 560 err = ocfs2_qinfo_lock(info, freeing); 561 if (err < 0) { 562 mlog(ML_ERROR, "Failed to lock quota info, losing quota write" 563 " (type=%d, id=%u)\n", dquot->dq_id.type, 564 (unsigned)from_kqid(&init_user_ns, dquot->dq_id)); 565 goto out; 566 } 567 if (freeing) 568 OCFS2_DQUOT(dquot)->dq_use_count--; 569 err = qtree_write_dquot(&info->dqi_gi, dquot); 570 if (err < 0) 571 goto out_qlock; 572 if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) { 573 err = qtree_release_dquot(&info->dqi_gi, dquot); 574 if (info_dirty(sb_dqinfo(sb, type))) { 575 err2 = __ocfs2_global_write_info(sb, type); 576 if (!err) 577 err = err2; 578 } 579 } 580 out_qlock: 581 ocfs2_qinfo_unlock(info, freeing); 582 out: 583 if (err < 0) 584 mlog_errno(err); 585 return err; 586 } 587 588 /* 589 * Functions for periodic syncing of dquots with global file 590 */ 591 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type) 592 { 593 handle_t *handle; 594 struct super_block *sb = dquot->dq_sb; 595 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 596 struct ocfs2_super *osb = OCFS2_SB(sb); 597 int status = 0; 598 599 trace_ocfs2_sync_dquot_helper(from_kqid(&init_user_ns, dquot->dq_id), 600 dquot->dq_id.type, 601 type, sb->s_id); 602 if (type != dquot->dq_id.type) 603 goto out; 604 status = ocfs2_lock_global_qf(oinfo, 1); 605 if (status < 0) 606 goto out; 607 608 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS); 609 if (IS_ERR(handle)) { 610 status = PTR_ERR(handle); 611 mlog_errno(status); 612 goto out_ilock; 613 } 614 mutex_lock(&sb_dqopt(sb)->dqio_mutex); 615 status = ocfs2_sync_dquot(dquot); 616 if (status < 0) 617 mlog_errno(status); 618 /* We have to write local structure as well... */ 619 status = ocfs2_local_write_dquot(dquot); 620 if (status < 0) 621 mlog_errno(status); 622 mutex_unlock(&sb_dqopt(sb)->dqio_mutex); 623 ocfs2_commit_trans(osb, handle); 624 out_ilock: 625 ocfs2_unlock_global_qf(oinfo, 1); 626 out: 627 return status; 628 } 629 630 static void qsync_work_fn(struct work_struct *work) 631 { 632 struct ocfs2_mem_dqinfo *oinfo = container_of(work, 633 struct ocfs2_mem_dqinfo, 634 dqi_sync_work.work); 635 struct super_block *sb = oinfo->dqi_gqinode->i_sb; 636 637 dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type); 638 schedule_delayed_work(&oinfo->dqi_sync_work, 639 msecs_to_jiffies(oinfo->dqi_syncms)); 640 } 641 642 /* 643 * Wrappers for generic quota functions 644 */ 645 646 static int ocfs2_write_dquot(struct dquot *dquot) 647 { 648 handle_t *handle; 649 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb); 650 int status = 0; 651 652 trace_ocfs2_write_dquot(from_kqid(&init_user_ns, dquot->dq_id), 653 dquot->dq_id.type); 654 655 handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS); 656 if (IS_ERR(handle)) { 657 status = PTR_ERR(handle); 658 mlog_errno(status); 659 goto out; 660 } 661 mutex_lock(&sb_dqopt(dquot->dq_sb)->dqio_mutex); 662 status = ocfs2_local_write_dquot(dquot); 663 mutex_unlock(&sb_dqopt(dquot->dq_sb)->dqio_mutex); 664 ocfs2_commit_trans(osb, handle); 665 out: 666 return status; 667 } 668 669 static int ocfs2_calc_qdel_credits(struct super_block *sb, int type) 670 { 671 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 672 /* 673 * We modify tree, leaf block, global info, local chunk header, 674 * global and local inode; OCFS2_QINFO_WRITE_CREDITS already 675 * accounts for inode update 676 */ 677 return (oinfo->dqi_gi.dqi_qtree_depth + 2) * 678 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 679 OCFS2_QINFO_WRITE_CREDITS + 680 OCFS2_INODE_UPDATE_CREDITS; 681 } 682 683 void ocfs2_drop_dquot_refs(struct work_struct *work) 684 { 685 struct ocfs2_super *osb = container_of(work, struct ocfs2_super, 686 dquot_drop_work); 687 struct llist_node *list; 688 struct ocfs2_dquot *odquot, *next_odquot; 689 690 list = llist_del_all(&osb->dquot_drop_list); 691 llist_for_each_entry_safe(odquot, next_odquot, list, list) { 692 /* Drop the reference we acquired in ocfs2_dquot_release() */ 693 dqput(&odquot->dq_dquot); 694 } 695 } 696 697 /* 698 * Called when the last reference to dquot is dropped. If we are called from 699 * downconvert thread, we cannot do all the handling here because grabbing 700 * quota lock could deadlock (the node holding the quota lock could need some 701 * other cluster lock to proceed but with blocked downconvert thread we cannot 702 * release any lock). 703 */ 704 static int ocfs2_release_dquot(struct dquot *dquot) 705 { 706 handle_t *handle; 707 struct ocfs2_mem_dqinfo *oinfo = 708 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; 709 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb); 710 int status = 0; 711 712 trace_ocfs2_release_dquot(from_kqid(&init_user_ns, dquot->dq_id), 713 dquot->dq_id.type); 714 715 mutex_lock(&dquot->dq_lock); 716 /* Check whether we are not racing with some other dqget() */ 717 if (atomic_read(&dquot->dq_count) > 1) 718 goto out; 719 /* Running from downconvert thread? Postpone quota processing to wq */ 720 if (current == osb->dc_task) { 721 /* 722 * Grab our own reference to dquot and queue it for delayed 723 * dropping. Quota code rechecks after calling 724 * ->release_dquot() and won't free dquot structure. 725 */ 726 dqgrab(dquot); 727 /* First entry on list -> queue work */ 728 if (llist_add(&OCFS2_DQUOT(dquot)->list, &osb->dquot_drop_list)) 729 queue_work(ocfs2_wq, &osb->dquot_drop_work); 730 goto out; 731 } 732 status = ocfs2_lock_global_qf(oinfo, 1); 733 if (status < 0) 734 goto out; 735 handle = ocfs2_start_trans(osb, 736 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_id.type)); 737 if (IS_ERR(handle)) { 738 status = PTR_ERR(handle); 739 mlog_errno(status); 740 goto out_ilock; 741 } 742 743 status = ocfs2_global_release_dquot(dquot); 744 if (status < 0) { 745 mlog_errno(status); 746 goto out_trans; 747 } 748 status = ocfs2_local_release_dquot(handle, dquot); 749 /* 750 * If we fail here, we cannot do much as global structure is 751 * already released. So just complain... 752 */ 753 if (status < 0) 754 mlog_errno(status); 755 /* 756 * Clear dq_off so that we search for the structure in quota file next 757 * time we acquire it. The structure might be deleted and reallocated 758 * elsewhere by another node while our dquot structure is on freelist. 759 */ 760 dquot->dq_off = 0; 761 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 762 out_trans: 763 ocfs2_commit_trans(osb, handle); 764 out_ilock: 765 ocfs2_unlock_global_qf(oinfo, 1); 766 out: 767 mutex_unlock(&dquot->dq_lock); 768 if (status) 769 mlog_errno(status); 770 return status; 771 } 772 773 /* 774 * Read global dquot structure from disk or create it if it does 775 * not exist. Also update use count of the global structure and 776 * create structure in node-local quota file. 777 */ 778 static int ocfs2_acquire_dquot(struct dquot *dquot) 779 { 780 int status = 0, err; 781 int ex = 0; 782 struct super_block *sb = dquot->dq_sb; 783 struct ocfs2_super *osb = OCFS2_SB(sb); 784 int type = dquot->dq_id.type; 785 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv; 786 struct inode *gqinode = info->dqi_gqinode; 787 int need_alloc = ocfs2_global_qinit_alloc(sb, type); 788 handle_t *handle; 789 790 trace_ocfs2_acquire_dquot(from_kqid(&init_user_ns, dquot->dq_id), 791 type); 792 mutex_lock(&dquot->dq_lock); 793 /* 794 * We need an exclusive lock, because we're going to update use count 795 * and instantiate possibly new dquot structure 796 */ 797 status = ocfs2_lock_global_qf(info, 1); 798 if (status < 0) 799 goto out; 800 status = ocfs2_qinfo_lock(info, 0); 801 if (status < 0) 802 goto out_dq; 803 /* 804 * We always want to read dquot structure from disk because we don't 805 * know what happened with it while it was on freelist. 806 */ 807 status = qtree_read_dquot(&info->dqi_gi, dquot); 808 ocfs2_qinfo_unlock(info, 0); 809 if (status < 0) 810 goto out_dq; 811 812 OCFS2_DQUOT(dquot)->dq_use_count++; 813 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace; 814 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes; 815 if (!dquot->dq_off) { /* No real quota entry? */ 816 ex = 1; 817 /* 818 * Add blocks to quota file before we start a transaction since 819 * locking allocators ranks above a transaction start 820 */ 821 WARN_ON(journal_current_handle()); 822 status = ocfs2_extend_no_holes(gqinode, NULL, 823 i_size_read(gqinode) + (need_alloc << sb->s_blocksize_bits), 824 i_size_read(gqinode)); 825 if (status < 0) 826 goto out_dq; 827 } 828 829 handle = ocfs2_start_trans(osb, 830 ocfs2_calc_global_qinit_credits(sb, type)); 831 if (IS_ERR(handle)) { 832 status = PTR_ERR(handle); 833 goto out_dq; 834 } 835 status = ocfs2_qinfo_lock(info, ex); 836 if (status < 0) 837 goto out_trans; 838 status = qtree_write_dquot(&info->dqi_gi, dquot); 839 if (ex && info_dirty(sb_dqinfo(sb, type))) { 840 err = __ocfs2_global_write_info(sb, type); 841 if (!status) 842 status = err; 843 } 844 ocfs2_qinfo_unlock(info, ex); 845 out_trans: 846 ocfs2_commit_trans(osb, handle); 847 out_dq: 848 ocfs2_unlock_global_qf(info, 1); 849 if (status < 0) 850 goto out; 851 852 status = ocfs2_create_local_dquot(dquot); 853 if (status < 0) 854 goto out; 855 set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 856 out: 857 mutex_unlock(&dquot->dq_lock); 858 if (status) 859 mlog_errno(status); 860 return status; 861 } 862 863 static int ocfs2_mark_dquot_dirty(struct dquot *dquot) 864 { 865 unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) | 866 (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) | 867 (1 << (DQ_LASTSET_B + QIF_INODES_B)) | 868 (1 << (DQ_LASTSET_B + QIF_SPACE_B)) | 869 (1 << (DQ_LASTSET_B + QIF_BTIME_B)) | 870 (1 << (DQ_LASTSET_B + QIF_ITIME_B)); 871 int sync = 0; 872 int status; 873 struct super_block *sb = dquot->dq_sb; 874 int type = dquot->dq_id.type; 875 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 876 handle_t *handle; 877 struct ocfs2_super *osb = OCFS2_SB(sb); 878 879 trace_ocfs2_mark_dquot_dirty(from_kqid(&init_user_ns, dquot->dq_id), 880 type); 881 882 /* In case user set some limits, sync dquot immediately to global 883 * quota file so that information propagates quicker */ 884 spin_lock(&dq_data_lock); 885 if (dquot->dq_flags & mask) 886 sync = 1; 887 spin_unlock(&dq_data_lock); 888 /* This is a slight hack but we can't afford getting global quota 889 * lock if we already have a transaction started. */ 890 if (!sync || journal_current_handle()) { 891 status = ocfs2_write_dquot(dquot); 892 goto out; 893 } 894 status = ocfs2_lock_global_qf(oinfo, 1); 895 if (status < 0) 896 goto out; 897 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS); 898 if (IS_ERR(handle)) { 899 status = PTR_ERR(handle); 900 mlog_errno(status); 901 goto out_ilock; 902 } 903 mutex_lock(&sb_dqopt(sb)->dqio_mutex); 904 status = ocfs2_sync_dquot(dquot); 905 if (status < 0) { 906 mlog_errno(status); 907 goto out_dlock; 908 } 909 /* Now write updated local dquot structure */ 910 status = ocfs2_local_write_dquot(dquot); 911 out_dlock: 912 mutex_unlock(&sb_dqopt(sb)->dqio_mutex); 913 ocfs2_commit_trans(osb, handle); 914 out_ilock: 915 ocfs2_unlock_global_qf(oinfo, 1); 916 out: 917 if (status) 918 mlog_errno(status); 919 return status; 920 } 921 922 /* This should happen only after set_dqinfo(). */ 923 static int ocfs2_write_info(struct super_block *sb, int type) 924 { 925 handle_t *handle; 926 int status = 0; 927 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 928 929 status = ocfs2_lock_global_qf(oinfo, 1); 930 if (status < 0) 931 goto out; 932 handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS); 933 if (IS_ERR(handle)) { 934 status = PTR_ERR(handle); 935 mlog_errno(status); 936 goto out_ilock; 937 } 938 status = dquot_commit_info(sb, type); 939 ocfs2_commit_trans(OCFS2_SB(sb), handle); 940 out_ilock: 941 ocfs2_unlock_global_qf(oinfo, 1); 942 out: 943 if (status) 944 mlog_errno(status); 945 return status; 946 } 947 948 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type) 949 { 950 struct ocfs2_dquot *dquot = 951 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS); 952 953 if (!dquot) 954 return NULL; 955 return &dquot->dq_dquot; 956 } 957 958 static void ocfs2_destroy_dquot(struct dquot *dquot) 959 { 960 kmem_cache_free(ocfs2_dquot_cachep, dquot); 961 } 962 963 const struct dquot_operations ocfs2_quota_operations = { 964 /* We never make dquot dirty so .write_dquot is never called */ 965 .acquire_dquot = ocfs2_acquire_dquot, 966 .release_dquot = ocfs2_release_dquot, 967 .mark_dirty = ocfs2_mark_dquot_dirty, 968 .write_info = ocfs2_write_info, 969 .alloc_dquot = ocfs2_alloc_dquot, 970 .destroy_dquot = ocfs2_destroy_dquot, 971 }; 972