1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Implementation of operations over global quota file 4 */ 5#include <linux/spinlock.h> 6#include <linux/fs.h> 7#include <linux/slab.h> 8#include <linux/quota.h> 9#include <linux/quotaops.h> 10#include <linux/dqblk_qtree.h> 11#include <linux/jiffies.h> 12#include <linux/writeback.h> 13#include <linux/workqueue.h> 14#include <linux/llist.h> 15#include <linux/iversion.h> 16 17#include <cluster/masklog.h> 18 19#include "ocfs2_fs.h" 20#include "ocfs2.h" 21#include "alloc.h" 22#include "blockcheck.h" 23#include "inode.h" 24#include "journal.h" 25#include "file.h" 26#include "sysfile.h" 27#include "dlmglue.h" 28#include "uptodate.h" 29#include "super.h" 30#include "buffer_head_io.h" 31#include "quota.h" 32#include "ocfs2_trace.h" 33 34/* 35 * Locking of quotas with OCFS2 is rather complex. Here are rules that 36 * should be obeyed by all the functions: 37 * - any write of quota structure (either to local or global file) is protected 38 * by dqio_sem or dquot->dq_lock. 39 * - any modification of global quota file holds inode cluster lock, i_rwsem, 40 * and ip_alloc_sem of the global quota file (achieved by 41 * ocfs2_lock_global_qf). It also has to hold qinfo_lock. 42 * - an allocation of new blocks for local quota file is protected by 43 * its ip_alloc_sem 44 * 45 * A rough sketch of locking dependencies (lf = local file, gf = global file): 46 * Normal filesystem operation: 47 * start_trans -> dqio_sem -> write to lf 48 * Syncing of local and global file: 49 * ocfs2_lock_global_qf -> start_trans -> dqio_sem -> qinfo_lock -> 50 * write to gf 51 * -> write to lf 52 * Acquire dquot for the first time: 53 * dq_lock -> ocfs2_lock_global_qf -> qinfo_lock -> read from gf 54 * -> alloc space for gf 55 * -> start_trans -> qinfo_lock -> write to gf 56 * -> ip_alloc_sem of lf -> alloc space for lf 57 * -> write to lf 58 * Release last reference to dquot: 59 * dq_lock -> ocfs2_lock_global_qf -> start_trans -> qinfo_lock -> write to gf 60 * -> write to lf 61 * Note that all the above operations also hold the inode cluster lock of lf. 62 * Recovery: 63 * inode cluster lock of recovered lf 64 * -> read bitmaps -> ip_alloc_sem of lf 65 * -> ocfs2_lock_global_qf -> start_trans -> dqio_sem -> qinfo_lock -> 66 * write to gf 67 */ 68 69static void qsync_work_fn(struct work_struct *work); 70 71static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp) 72{ 73 struct ocfs2_global_disk_dqblk *d = dp; 74 struct mem_dqblk *m = &dquot->dq_dqb; 75 76 /* Update from disk only entries not set by the admin */ 77 if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) { 78 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit); 79 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit); 80 } 81 if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags)) 82 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes); 83 if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) { 84 m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit); 85 m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit); 86 } 87 if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags)) 88 m->dqb_curspace = le64_to_cpu(d->dqb_curspace); 89 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags)) 90 m->dqb_btime = le64_to_cpu(d->dqb_btime); 91 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags)) 92 m->dqb_itime = le64_to_cpu(d->dqb_itime); 93 OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count); 94} 95 96static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot) 97{ 98 struct ocfs2_global_disk_dqblk *d = dp; 99 struct mem_dqblk *m = &dquot->dq_dqb; 100 101 d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id)); 102 d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count); 103 d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit); 104 d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit); 105 d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes); 106 d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit); 107 d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit); 108 d->dqb_curspace = cpu_to_le64(m->dqb_curspace); 109 d->dqb_btime = cpu_to_le64(m->dqb_btime); 110 d->dqb_itime = cpu_to_le64(m->dqb_itime); 111 d->dqb_pad1 = d->dqb_pad2 = 0; 112} 113 114static int ocfs2_global_is_id(void *dp, struct dquot *dquot) 115{ 116 struct ocfs2_global_disk_dqblk *d = dp; 117 struct ocfs2_mem_dqinfo *oinfo = 118 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; 119 120 if (qtree_entry_unused(&oinfo->dqi_gi, dp)) 121 return 0; 122 123 return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type, 124 le32_to_cpu(d->dqb_id)), 125 dquot->dq_id); 126} 127 128const struct qtree_fmt_operations ocfs2_global_ops = { 129 .mem2disk_dqblk = ocfs2_global_mem2diskdqb, 130 .disk2mem_dqblk = ocfs2_global_disk2memdqb, 131 .is_id = ocfs2_global_is_id, 132}; 133 134int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh) 135{ 136 struct ocfs2_disk_dqtrailer *dqt = 137 ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data); 138 139 trace_ocfs2_validate_quota_block((unsigned long long)bh->b_blocknr); 140 141 BUG_ON(!buffer_uptodate(bh)); 142 143 /* 144 * If the ecc fails, we return the error but otherwise 145 * leave the filesystem running. We know any error is 146 * local to this block. 147 */ 148 return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check); 149} 150 151int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block, 152 struct buffer_head **bhp) 153{ 154 int rc; 155 156 *bhp = NULL; 157 rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, 1, bhp, 0, 158 ocfs2_validate_quota_block); 159 if (rc) 160 mlog_errno(rc); 161 return rc; 162} 163 164/* Read data from global quotafile - avoid pagecache and such because we cannot 165 * afford acquiring the locks... We use quota cluster lock to serialize 166 * operations. Caller is responsible for acquiring it. */ 167ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data, 168 size_t len, loff_t off) 169{ 170 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 171 struct inode *gqinode = oinfo->dqi_gqinode; 172 loff_t i_size = i_size_read(gqinode); 173 int offset = off & (sb->s_blocksize - 1); 174 sector_t blk = off >> sb->s_blocksize_bits; 175 int err = 0; 176 struct buffer_head *bh; 177 size_t toread, tocopy; 178 u64 pblock = 0, pcount = 0; 179 180 if (off > i_size) 181 return 0; 182 if (off + len > i_size) 183 len = i_size - off; 184 toread = len; 185 while (toread > 0) { 186 tocopy = min_t(size_t, (sb->s_blocksize - offset), toread); 187 if (!pcount) { 188 err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, 189 &pcount, NULL); 190 if (err) { 191 mlog_errno(err); 192 return err; 193 } 194 } else { 195 pcount--; 196 pblock++; 197 } 198 bh = NULL; 199 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh); 200 if (err) { 201 mlog_errno(err); 202 return err; 203 } 204 memcpy(data, bh->b_data + offset, tocopy); 205 brelse(bh); 206 offset = 0; 207 toread -= tocopy; 208 data += tocopy; 209 blk++; 210 } 211 return len; 212} 213 214/* Write to quotafile (we know the transaction is already started and has 215 * enough credits) */ 216ssize_t ocfs2_quota_write(struct super_block *sb, int type, 217 const char *data, size_t len, loff_t off) 218{ 219 struct mem_dqinfo *info = sb_dqinfo(sb, type); 220 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv; 221 struct inode *gqinode = oinfo->dqi_gqinode; 222 int offset = off & (sb->s_blocksize - 1); 223 sector_t blk = off >> sb->s_blocksize_bits; 224 int err = 0, new = 0, ja_type; 225 struct buffer_head *bh = NULL; 226 handle_t *handle = journal_current_handle(); 227 u64 pblock, pcount; 228 229 if (!handle) { 230 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled " 231 "because transaction was not started.\n", 232 (unsigned long long)off, (unsigned long long)len); 233 return -EIO; 234 } 235 if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) { 236 WARN_ON(1); 237 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset; 238 } 239 240 if (i_size_read(gqinode) < off + len) { 241 loff_t rounded_end = 242 ocfs2_align_bytes_to_blocks(sb, off + len); 243 244 /* Space is already allocated in ocfs2_acquire_dquot() */ 245 err = ocfs2_simple_size_update(gqinode, 246 oinfo->dqi_gqi_bh, 247 rounded_end); 248 if (err < 0) 249 goto out; 250 new = 1; 251 } 252 err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, &pcount, NULL); 253 if (err) { 254 mlog_errno(err); 255 goto out; 256 } 257 /* Not rewriting whole block? */ 258 if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) && 259 !new) { 260 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh); 261 ja_type = OCFS2_JOURNAL_ACCESS_WRITE; 262 } else { 263 bh = sb_getblk(sb, pblock); 264 if (!bh) 265 err = -ENOMEM; 266 ja_type = OCFS2_JOURNAL_ACCESS_CREATE; 267 } 268 if (err) { 269 mlog_errno(err); 270 goto out; 271 } 272 lock_buffer(bh); 273 if (new) 274 memset(bh->b_data, 0, sb->s_blocksize); 275 memcpy(bh->b_data + offset, data, len); 276 flush_dcache_page(bh->b_page); 277 set_buffer_uptodate(bh); 278 unlock_buffer(bh); 279 ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh); 280 err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh, 281 ja_type); 282 if (err < 0) { 283 brelse(bh); 284 goto out; 285 } 286 ocfs2_journal_dirty(handle, bh); 287 brelse(bh); 288out: 289 if (err) { 290 mlog_errno(err); 291 return err; 292 } 293 inode_inc_iversion(gqinode); 294 ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh); 295 return len; 296} 297 298int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex) 299{ 300 int status; 301 struct buffer_head *bh = NULL; 302 303 status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex); 304 if (status < 0) 305 return status; 306 spin_lock(&dq_data_lock); 307 if (!oinfo->dqi_gqi_count++) 308 oinfo->dqi_gqi_bh = bh; 309 else 310 WARN_ON(bh != oinfo->dqi_gqi_bh); 311 spin_unlock(&dq_data_lock); 312 if (ex) { 313 inode_lock(oinfo->dqi_gqinode); 314 down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem); 315 } else { 316 down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem); 317 } 318 return 0; 319} 320 321void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex) 322{ 323 if (ex) { 324 up_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem); 325 inode_unlock(oinfo->dqi_gqinode); 326 } else { 327 up_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem); 328 } 329 ocfs2_inode_unlock(oinfo->dqi_gqinode, ex); 330 brelse(oinfo->dqi_gqi_bh); 331 spin_lock(&dq_data_lock); 332 if (!--oinfo->dqi_gqi_count) 333 oinfo->dqi_gqi_bh = NULL; 334 spin_unlock(&dq_data_lock); 335} 336 337/* Read information header from global quota file */ 338int ocfs2_global_read_info(struct super_block *sb, int type) 339{ 340 unsigned int ino[OCFS2_MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE, 341 GROUP_QUOTA_SYSTEM_INODE }; 342 struct ocfs2_global_disk_dqinfo dinfo; 343 struct mem_dqinfo *info = sb_dqinfo(sb, type); 344 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv; 345 u64 pcount; 346 int status; 347 348 oinfo->dqi_gi.dqi_sb = sb; 349 oinfo->dqi_gi.dqi_type = type; 350 ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo); 351 oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk); 352 oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops; 353 oinfo->dqi_gqi_bh = NULL; 354 oinfo->dqi_gqi_count = 0; 355 356 /* Read global header */ 357 oinfo->dqi_gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type], 358 OCFS2_INVALID_SLOT); 359 if (!oinfo->dqi_gqinode) { 360 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n", 361 type); 362 status = -EINVAL; 363 goto out_err; 364 } 365 366 status = ocfs2_lock_global_qf(oinfo, 0); 367 if (status < 0) { 368 mlog_errno(status); 369 goto out_err; 370 } 371 372 status = ocfs2_extent_map_get_blocks(oinfo->dqi_gqinode, 0, &oinfo->dqi_giblk, 373 &pcount, NULL); 374 if (status < 0) 375 goto out_unlock; 376 377 status = ocfs2_qinfo_lock(oinfo, 0); 378 if (status < 0) 379 goto out_unlock; 380 status = sb->s_op->quota_read(sb, type, (char *)&dinfo, 381 sizeof(struct ocfs2_global_disk_dqinfo), 382 OCFS2_GLOBAL_INFO_OFF); 383 ocfs2_qinfo_unlock(oinfo, 0); 384 ocfs2_unlock_global_qf(oinfo, 0); 385 if (status != sizeof(struct ocfs2_global_disk_dqinfo)) { 386 mlog(ML_ERROR, "Cannot read global quota info (%d).\n", 387 status); 388 if (status >= 0) 389 status = -EIO; 390 mlog_errno(status); 391 goto out_err; 392 } 393 info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace); 394 info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace); 395 oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms); 396 oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks); 397 oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk); 398 oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry); 399 oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits; 400 oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize - 401 OCFS2_QBLK_RESERVED_SPACE; 402 oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi); 403 INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn); 404 schedule_delayed_work(&oinfo->dqi_sync_work, 405 msecs_to_jiffies(oinfo->dqi_syncms)); 406 407out_err: 408 return status; 409out_unlock: 410 ocfs2_unlock_global_qf(oinfo, 0); 411 mlog_errno(status); 412 goto out_err; 413} 414 415/* Write information to global quota file. Expects exclusive lock on quota 416 * file inode and quota info */ 417static int __ocfs2_global_write_info(struct super_block *sb, int type) 418{ 419 struct mem_dqinfo *info = sb_dqinfo(sb, type); 420 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv; 421 struct ocfs2_global_disk_dqinfo dinfo; 422 ssize_t size; 423 424 spin_lock(&dq_data_lock); 425 info->dqi_flags &= ~DQF_INFO_DIRTY; 426 dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace); 427 dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace); 428 spin_unlock(&dq_data_lock); 429 dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms); 430 dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks); 431 dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk); 432 dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry); 433 size = sb->s_op->quota_write(sb, type, (char *)&dinfo, 434 sizeof(struct ocfs2_global_disk_dqinfo), 435 OCFS2_GLOBAL_INFO_OFF); 436 if (size != sizeof(struct ocfs2_global_disk_dqinfo)) { 437 mlog(ML_ERROR, "Cannot write global quota info structure\n"); 438 if (size >= 0) 439 size = -EIO; 440 return size; 441 } 442 return 0; 443} 444 445int ocfs2_global_write_info(struct super_block *sb, int type) 446{ 447 int err; 448 struct quota_info *dqopt = sb_dqopt(sb); 449 struct ocfs2_mem_dqinfo *info = dqopt->info[type].dqi_priv; 450 unsigned int memalloc; 451 452 down_write(&dqopt->dqio_sem); 453 memalloc = memalloc_nofs_save(); 454 err = ocfs2_qinfo_lock(info, 1); 455 if (err < 0) 456 goto out_sem; 457 err = __ocfs2_global_write_info(sb, type); 458 ocfs2_qinfo_unlock(info, 1); 459out_sem: 460 memalloc_nofs_restore(memalloc); 461 up_write(&dqopt->dqio_sem); 462 return err; 463} 464 465static int ocfs2_global_qinit_alloc(struct super_block *sb, int type) 466{ 467 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 468 469 /* 470 * We may need to allocate tree blocks and a leaf block but not the 471 * root block 472 */ 473 return oinfo->dqi_gi.dqi_qtree_depth; 474} 475 476static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type) 477{ 478 /* We modify all the allocated blocks, tree root, info block and 479 * the inode */ 480 return (ocfs2_global_qinit_alloc(sb, type) + 2) * 481 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1; 482} 483 484/* Sync local information about quota modifications with global quota file. 485 * Caller must have started the transaction and obtained exclusive lock for 486 * global quota file inode */ 487int __ocfs2_sync_dquot(struct dquot *dquot, int freeing) 488{ 489 int err, err2; 490 struct super_block *sb = dquot->dq_sb; 491 int type = dquot->dq_id.type; 492 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv; 493 struct ocfs2_global_disk_dqblk dqblk; 494 s64 spacechange, inodechange; 495 time64_t olditime, oldbtime; 496 497 err = sb->s_op->quota_read(sb, type, (char *)&dqblk, 498 sizeof(struct ocfs2_global_disk_dqblk), 499 dquot->dq_off); 500 if (err != sizeof(struct ocfs2_global_disk_dqblk)) { 501 if (err >= 0) { 502 mlog(ML_ERROR, "Short read from global quota file " 503 "(%u read)\n", err); 504 err = -EIO; 505 } 506 goto out; 507 } 508 509 /* Update space and inode usage. Get also other information from 510 * global quota file so that we don't overwrite any changes there. 511 * We are */ 512 spin_lock(&dquot->dq_dqb_lock); 513 spacechange = dquot->dq_dqb.dqb_curspace - 514 OCFS2_DQUOT(dquot)->dq_origspace; 515 inodechange = dquot->dq_dqb.dqb_curinodes - 516 OCFS2_DQUOT(dquot)->dq_originodes; 517 olditime = dquot->dq_dqb.dqb_itime; 518 oldbtime = dquot->dq_dqb.dqb_btime; 519 ocfs2_global_disk2memdqb(dquot, &dqblk); 520 trace_ocfs2_sync_dquot(from_kqid(&init_user_ns, dquot->dq_id), 521 dquot->dq_dqb.dqb_curspace, 522 (long long)spacechange, 523 dquot->dq_dqb.dqb_curinodes, 524 (long long)inodechange); 525 if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags)) 526 dquot->dq_dqb.dqb_curspace += spacechange; 527 if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags)) 528 dquot->dq_dqb.dqb_curinodes += inodechange; 529 /* Set properly space grace time... */ 530 if (dquot->dq_dqb.dqb_bsoftlimit && 531 dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) { 532 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) && 533 oldbtime > 0) { 534 if (dquot->dq_dqb.dqb_btime > 0) 535 dquot->dq_dqb.dqb_btime = 536 min(dquot->dq_dqb.dqb_btime, oldbtime); 537 else 538 dquot->dq_dqb.dqb_btime = oldbtime; 539 } 540 } else { 541 dquot->dq_dqb.dqb_btime = 0; 542 clear_bit(DQ_BLKS_B, &dquot->dq_flags); 543 } 544 /* Set properly inode grace time... */ 545 if (dquot->dq_dqb.dqb_isoftlimit && 546 dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) { 547 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) && 548 olditime > 0) { 549 if (dquot->dq_dqb.dqb_itime > 0) 550 dquot->dq_dqb.dqb_itime = 551 min(dquot->dq_dqb.dqb_itime, olditime); 552 else 553 dquot->dq_dqb.dqb_itime = olditime; 554 } 555 } else { 556 dquot->dq_dqb.dqb_itime = 0; 557 clear_bit(DQ_INODES_B, &dquot->dq_flags); 558 } 559 /* All information is properly updated, clear the flags */ 560 __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); 561 __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); 562 __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); 563 __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); 564 __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); 565 __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); 566 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace; 567 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes; 568 spin_unlock(&dquot->dq_dqb_lock); 569 err = ocfs2_qinfo_lock(info, freeing); 570 if (err < 0) { 571 mlog(ML_ERROR, "Failed to lock quota info, losing quota write" 572 " (type=%d, id=%u)\n", dquot->dq_id.type, 573 (unsigned)from_kqid(&init_user_ns, dquot->dq_id)); 574 goto out; 575 } 576 if (freeing) 577 OCFS2_DQUOT(dquot)->dq_use_count--; 578 err = qtree_write_dquot(&info->dqi_gi, dquot); 579 if (err < 0) 580 goto out_qlock; 581 if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) { 582 err = qtree_release_dquot(&info->dqi_gi, dquot); 583 if (info_dirty(sb_dqinfo(sb, type))) { 584 err2 = __ocfs2_global_write_info(sb, type); 585 if (!err) 586 err = err2; 587 } 588 } 589out_qlock: 590 ocfs2_qinfo_unlock(info, freeing); 591out: 592 if (err < 0) 593 mlog_errno(err); 594 return err; 595} 596 597/* 598 * Functions for periodic syncing of dquots with global file 599 */ 600static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type) 601{ 602 handle_t *handle; 603 struct super_block *sb = dquot->dq_sb; 604 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 605 struct ocfs2_super *osb = OCFS2_SB(sb); 606 int status = 0; 607 unsigned int memalloc; 608 609 trace_ocfs2_sync_dquot_helper(from_kqid(&init_user_ns, dquot->dq_id), 610 dquot->dq_id.type, 611 type, sb->s_id); 612 if (type != dquot->dq_id.type) 613 goto out; 614 status = ocfs2_lock_global_qf(oinfo, 1); 615 if (status < 0) 616 goto out; 617 618 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS); 619 if (IS_ERR(handle)) { 620 status = PTR_ERR(handle); 621 mlog_errno(status); 622 goto out_ilock; 623 } 624 down_write(&sb_dqopt(sb)->dqio_sem); 625 memalloc = memalloc_nofs_save(); 626 status = ocfs2_sync_dquot(dquot); 627 if (status < 0) 628 mlog_errno(status); 629 /* We have to write local structure as well... */ 630 status = ocfs2_local_write_dquot(dquot); 631 if (status < 0) 632 mlog_errno(status); 633 memalloc_nofs_restore(memalloc); 634 up_write(&sb_dqopt(sb)->dqio_sem); 635 ocfs2_commit_trans(osb, handle); 636out_ilock: 637 ocfs2_unlock_global_qf(oinfo, 1); 638out: 639 return status; 640} 641 642static void qsync_work_fn(struct work_struct *work) 643{ 644 struct ocfs2_mem_dqinfo *oinfo = container_of(work, 645 struct ocfs2_mem_dqinfo, 646 dqi_sync_work.work); 647 struct super_block *sb = oinfo->dqi_gqinode->i_sb; 648 649 /* 650 * We have to be careful here not to deadlock on s_umount as umount 651 * disabling quotas may be in progress and it waits for this work to 652 * complete. If trylock fails, we'll do the sync next time... 653 */ 654 if (down_read_trylock(&sb->s_umount)) { 655 dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type); 656 up_read(&sb->s_umount); 657 } 658 schedule_delayed_work(&oinfo->dqi_sync_work, 659 msecs_to_jiffies(oinfo->dqi_syncms)); 660} 661 662/* 663 * Wrappers for generic quota functions 664 */ 665 666static int ocfs2_write_dquot(struct dquot *dquot) 667{ 668 handle_t *handle; 669 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb); 670 int status = 0; 671 unsigned int memalloc; 672 673 trace_ocfs2_write_dquot(from_kqid(&init_user_ns, dquot->dq_id), 674 dquot->dq_id.type); 675 676 handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS); 677 if (IS_ERR(handle)) { 678 status = PTR_ERR(handle); 679 mlog_errno(status); 680 goto out; 681 } 682 down_write(&sb_dqopt(dquot->dq_sb)->dqio_sem); 683 memalloc = memalloc_nofs_save(); 684 status = ocfs2_local_write_dquot(dquot); 685 memalloc_nofs_restore(memalloc); 686 up_write(&sb_dqopt(dquot->dq_sb)->dqio_sem); 687 ocfs2_commit_trans(osb, handle); 688out: 689 return status; 690} 691 692static int ocfs2_calc_qdel_credits(struct super_block *sb, int type) 693{ 694 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 695 /* 696 * We modify tree, leaf block, global info, local chunk header, 697 * global and local inode; OCFS2_QINFO_WRITE_CREDITS already 698 * accounts for inode update 699 */ 700 return (oinfo->dqi_gi.dqi_qtree_depth + 2) * 701 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 702 OCFS2_QINFO_WRITE_CREDITS + 703 OCFS2_INODE_UPDATE_CREDITS; 704} 705 706void ocfs2_drop_dquot_refs(struct work_struct *work) 707{ 708 struct ocfs2_super *osb = container_of(work, struct ocfs2_super, 709 dquot_drop_work); 710 struct llist_node *list; 711 struct ocfs2_dquot *odquot, *next_odquot; 712 713 list = llist_del_all(&osb->dquot_drop_list); 714 llist_for_each_entry_safe(odquot, next_odquot, list, list) { 715 /* Drop the reference we acquired in ocfs2_dquot_release() */ 716 dqput(&odquot->dq_dquot); 717 } 718} 719 720/* 721 * Called when the last reference to dquot is dropped. If we are called from 722 * downconvert thread, we cannot do all the handling here because grabbing 723 * quota lock could deadlock (the node holding the quota lock could need some 724 * other cluster lock to proceed but with blocked downconvert thread we cannot 725 * release any lock). 726 */ 727static int ocfs2_release_dquot(struct dquot *dquot) 728{ 729 handle_t *handle; 730 struct ocfs2_mem_dqinfo *oinfo = 731 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; 732 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb); 733 int status = 0; 734 735 trace_ocfs2_release_dquot(from_kqid(&init_user_ns, dquot->dq_id), 736 dquot->dq_id.type); 737 738 mutex_lock(&dquot->dq_lock); 739 /* Check whether we are not racing with some other dqget() */ 740 if (dquot_is_busy(dquot)) 741 goto out; 742 /* Running from downconvert thread? Postpone quota processing to wq */ 743 if (current == osb->dc_task) { 744 /* 745 * Grab our own reference to dquot and queue it for delayed 746 * dropping. Quota code rechecks after calling 747 * ->release_dquot() and won't free dquot structure. 748 */ 749 dqgrab(dquot); 750 /* First entry on list -> queue work */ 751 if (llist_add(&OCFS2_DQUOT(dquot)->list, &osb->dquot_drop_list)) 752 queue_work(osb->ocfs2_wq, &osb->dquot_drop_work); 753 goto out; 754 } 755 status = ocfs2_lock_global_qf(oinfo, 1); 756 if (status < 0) 757 goto out; 758 handle = ocfs2_start_trans(osb, 759 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_id.type)); 760 if (IS_ERR(handle)) { 761 status = PTR_ERR(handle); 762 mlog_errno(status); 763 goto out_ilock; 764 } 765 766 status = ocfs2_global_release_dquot(dquot); 767 if (status < 0) { 768 mlog_errno(status); 769 goto out_trans; 770 } 771 status = ocfs2_local_release_dquot(handle, dquot); 772 /* 773 * If we fail here, we cannot do much as global structure is 774 * already released. So just complain... 775 */ 776 if (status < 0) 777 mlog_errno(status); 778 /* 779 * Clear dq_off so that we search for the structure in quota file next 780 * time we acquire it. The structure might be deleted and reallocated 781 * elsewhere by another node while our dquot structure is on freelist. 782 */ 783 dquot->dq_off = 0; 784 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags); 785out_trans: 786 ocfs2_commit_trans(osb, handle); 787out_ilock: 788 ocfs2_unlock_global_qf(oinfo, 1); 789out: 790 mutex_unlock(&dquot->dq_lock); 791 if (status) 792 mlog_errno(status); 793 return status; 794} 795 796/* 797 * Read global dquot structure from disk or create it if it does 798 * not exist. Also update use count of the global structure and 799 * create structure in node-local quota file. 800 */ 801static int ocfs2_acquire_dquot(struct dquot *dquot) 802{ 803 int status = 0, err; 804 int ex = 0; 805 struct super_block *sb = dquot->dq_sb; 806 struct ocfs2_super *osb = OCFS2_SB(sb); 807 int type = dquot->dq_id.type; 808 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv; 809 struct inode *gqinode = info->dqi_gqinode; 810 int need_alloc = ocfs2_global_qinit_alloc(sb, type); 811 handle_t *handle; 812 813 trace_ocfs2_acquire_dquot(from_kqid(&init_user_ns, dquot->dq_id), 814 type); 815 mutex_lock(&dquot->dq_lock); 816 /* 817 * We need an exclusive lock, because we're going to update use count 818 * and instantiate possibly new dquot structure 819 */ 820 status = ocfs2_lock_global_qf(info, 1); 821 if (status < 0) 822 goto out; 823 status = ocfs2_qinfo_lock(info, 0); 824 if (status < 0) 825 goto out_dq; 826 /* 827 * We always want to read dquot structure from disk because we don't 828 * know what happened with it while it was on freelist. 829 */ 830 status = qtree_read_dquot(&info->dqi_gi, dquot); 831 ocfs2_qinfo_unlock(info, 0); 832 if (status < 0) 833 goto out_dq; 834 835 OCFS2_DQUOT(dquot)->dq_use_count++; 836 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace; 837 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes; 838 if (!dquot->dq_off) { /* No real quota entry? */ 839 ex = 1; 840 /* 841 * Add blocks to quota file before we start a transaction since 842 * locking allocators ranks above a transaction start 843 */ 844 WARN_ON(journal_current_handle()); 845 status = ocfs2_extend_no_holes(gqinode, NULL, 846 i_size_read(gqinode) + (need_alloc << sb->s_blocksize_bits), 847 i_size_read(gqinode)); 848 if (status < 0) 849 goto out_dq; 850 } 851 852 handle = ocfs2_start_trans(osb, 853 ocfs2_calc_global_qinit_credits(sb, type)); 854 if (IS_ERR(handle)) { 855 status = PTR_ERR(handle); 856 goto out_dq; 857 } 858 status = ocfs2_qinfo_lock(info, ex); 859 if (status < 0) 860 goto out_trans; 861 status = qtree_write_dquot(&info->dqi_gi, dquot); 862 if (ex && info_dirty(sb_dqinfo(sb, type))) { 863 err = __ocfs2_global_write_info(sb, type); 864 if (!status) 865 status = err; 866 } 867 ocfs2_qinfo_unlock(info, ex); 868out_trans: 869 ocfs2_commit_trans(osb, handle); 870out_dq: 871 ocfs2_unlock_global_qf(info, 1); 872 if (status < 0) 873 goto out; 874 875 status = ocfs2_create_local_dquot(dquot); 876 if (status < 0) 877 goto out; 878 set_bit(DQ_ACTIVE_B, &dquot->dq_flags); 879out: 880 mutex_unlock(&dquot->dq_lock); 881 if (status) 882 mlog_errno(status); 883 return status; 884} 885 886static int ocfs2_get_next_id(struct super_block *sb, struct kqid *qid) 887{ 888 int type = qid->type; 889 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv; 890 int status = 0; 891 892 trace_ocfs2_get_next_id(from_kqid(&init_user_ns, *qid), type); 893 if (!sb_has_quota_loaded(sb, type)) { 894 status = -ESRCH; 895 goto out; 896 } 897 status = ocfs2_lock_global_qf(info, 0); 898 if (status < 0) 899 goto out; 900 status = ocfs2_qinfo_lock(info, 0); 901 if (status < 0) 902 goto out_global; 903 status = qtree_get_next_id(&info->dqi_gi, qid); 904 ocfs2_qinfo_unlock(info, 0); 905out_global: 906 ocfs2_unlock_global_qf(info, 0); 907out: 908 /* 909 * Avoid logging ENOENT since it just means there isn't next ID and 910 * ESRCH which means quota isn't enabled for the filesystem. 911 */ 912 if (status && status != -ENOENT && status != -ESRCH) 913 mlog_errno(status); 914 return status; 915} 916 917static int ocfs2_mark_dquot_dirty(struct dquot *dquot) 918{ 919 unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) | 920 (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) | 921 (1 << (DQ_LASTSET_B + QIF_INODES_B)) | 922 (1 << (DQ_LASTSET_B + QIF_SPACE_B)) | 923 (1 << (DQ_LASTSET_B + QIF_BTIME_B)) | 924 (1 << (DQ_LASTSET_B + QIF_ITIME_B)); 925 int sync = 0; 926 int status; 927 struct super_block *sb = dquot->dq_sb; 928 int type = dquot->dq_id.type; 929 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 930 handle_t *handle; 931 struct ocfs2_super *osb = OCFS2_SB(sb); 932 unsigned int memalloc; 933 934 trace_ocfs2_mark_dquot_dirty(from_kqid(&init_user_ns, dquot->dq_id), 935 type); 936 937 /* In case user set some limits, sync dquot immediately to global 938 * quota file so that information propagates quicker */ 939 spin_lock(&dquot->dq_dqb_lock); 940 if (dquot->dq_flags & mask) 941 sync = 1; 942 spin_unlock(&dquot->dq_dqb_lock); 943 /* This is a slight hack but we can't afford getting global quota 944 * lock if we already have a transaction started. */ 945 if (!sync || journal_current_handle()) { 946 status = ocfs2_write_dquot(dquot); 947 goto out; 948 } 949 status = ocfs2_lock_global_qf(oinfo, 1); 950 if (status < 0) 951 goto out; 952 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS); 953 if (IS_ERR(handle)) { 954 status = PTR_ERR(handle); 955 mlog_errno(status); 956 goto out_ilock; 957 } 958 down_write(&sb_dqopt(sb)->dqio_sem); 959 memalloc = memalloc_nofs_save(); 960 status = ocfs2_sync_dquot(dquot); 961 if (status < 0) { 962 mlog_errno(status); 963 goto out_dlock; 964 } 965 /* Now write updated local dquot structure */ 966 status = ocfs2_local_write_dquot(dquot); 967out_dlock: 968 memalloc_nofs_restore(memalloc); 969 up_write(&sb_dqopt(sb)->dqio_sem); 970 ocfs2_commit_trans(osb, handle); 971out_ilock: 972 ocfs2_unlock_global_qf(oinfo, 1); 973out: 974 if (status) 975 mlog_errno(status); 976 return status; 977} 978 979/* This should happen only after set_dqinfo(). */ 980static int ocfs2_write_info(struct super_block *sb, int type) 981{ 982 handle_t *handle; 983 int status = 0; 984 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; 985 986 status = ocfs2_lock_global_qf(oinfo, 1); 987 if (status < 0) 988 goto out; 989 handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS); 990 if (IS_ERR(handle)) { 991 status = PTR_ERR(handle); 992 mlog_errno(status); 993 goto out_ilock; 994 } 995 status = dquot_commit_info(sb, type); 996 ocfs2_commit_trans(OCFS2_SB(sb), handle); 997out_ilock: 998 ocfs2_unlock_global_qf(oinfo, 1); 999out: 1000 if (status) 1001 mlog_errno(status); 1002 return status; 1003} 1004 1005static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type) 1006{ 1007 struct ocfs2_dquot *dquot = 1008 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS); 1009 1010 if (!dquot) 1011 return NULL; 1012 return &dquot->dq_dquot; 1013} 1014 1015static void ocfs2_destroy_dquot(struct dquot *dquot) 1016{ 1017 kmem_cache_free(ocfs2_dquot_cachep, dquot); 1018} 1019 1020const struct dquot_operations ocfs2_quota_operations = { 1021 /* We never make dquot dirty so .write_dquot is never called */ 1022 .acquire_dquot = ocfs2_acquire_dquot, 1023 .release_dquot = ocfs2_release_dquot, 1024 .mark_dirty = ocfs2_mark_dquot_dirty, 1025 .write_info = ocfs2_write_info, 1026 .alloc_dquot = ocfs2_alloc_dquot, 1027 .destroy_dquot = ocfs2_destroy_dquot, 1028 .get_next_id = ocfs2_get_next_id, 1029}; 1030