1 /* 2 * Copyright (C) International Business Machines Corp., 2000-2004 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 12 * the GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 */ 18 19 /* 20 * jfs_imap.c: inode allocation map manager 21 * 22 * Serialization: 23 * Each AG has a simple lock which is used to control the serialization of 24 * the AG level lists. This lock should be taken first whenever an AG 25 * level list will be modified or accessed. 26 * 27 * Each IAG is locked by obtaining the buffer for the IAG page. 28 * 29 * There is also a inode lock for the inode map inode. A read lock needs to 30 * be taken whenever an IAG is read from the map or the global level 31 * information is read. A write lock needs to be taken whenever the global 32 * level information is modified or an atomic operation needs to be used. 33 * 34 * If more than one IAG is read at one time, the read lock may not 35 * be given up until all of the IAG's are read. Otherwise, a deadlock 36 * may occur when trying to obtain the read lock while another thread 37 * holding the read lock is waiting on the IAG already being held. 38 * 39 * The control page of the inode map is read into memory by diMount(). 40 * Thereafter it should only be modified in memory and then it will be 41 * written out when the filesystem is unmounted by diUnmount(). 42 */ 43 44 #include <linux/fs.h> 45 #include <linux/buffer_head.h> 46 #include <linux/pagemap.h> 47 #include <linux/quotaops.h> 48 #include <linux/slab.h> 49 50 #include "jfs_incore.h" 51 #include "jfs_inode.h" 52 #include "jfs_filsys.h" 53 #include "jfs_dinode.h" 54 #include "jfs_dmap.h" 55 #include "jfs_imap.h" 56 #include "jfs_metapage.h" 57 #include "jfs_superblock.h" 58 #include "jfs_debug.h" 59 60 /* 61 * imap locks 62 */ 63 /* iag free list lock */ 64 #define IAGFREE_LOCK_INIT(imap) mutex_init(&imap->im_freelock) 65 #define IAGFREE_LOCK(imap) mutex_lock(&imap->im_freelock) 66 #define IAGFREE_UNLOCK(imap) mutex_unlock(&imap->im_freelock) 67 68 /* per ag iag list locks */ 69 #define AG_LOCK_INIT(imap,index) mutex_init(&(imap->im_aglock[index])) 70 #define AG_LOCK(imap,agno) mutex_lock(&imap->im_aglock[agno]) 71 #define AG_UNLOCK(imap,agno) mutex_unlock(&imap->im_aglock[agno]) 72 73 /* 74 * forward references 75 */ 76 static int diAllocAG(struct inomap *, int, bool, struct inode *); 77 static int diAllocAny(struct inomap *, int, bool, struct inode *); 78 static int diAllocBit(struct inomap *, struct iag *, int); 79 static int diAllocExt(struct inomap *, int, struct inode *); 80 static int diAllocIno(struct inomap *, int, struct inode *); 81 static int diFindFree(u32, int); 82 static int diNewExt(struct inomap *, struct iag *, int); 83 static int diNewIAG(struct inomap *, int *, int, struct metapage **); 84 static void duplicateIXtree(struct super_block *, s64, int, s64 *); 85 86 static int diIAGRead(struct inomap * imap, int, struct metapage **); 87 static int copy_from_dinode(struct dinode *, struct inode *); 88 static void copy_to_dinode(struct dinode *, struct inode *); 89 90 /* 91 * NAME: diMount() 92 * 93 * FUNCTION: initialize the incore inode map control structures for 94 * a fileset or aggregate init time. 95 * 96 * the inode map's control structure (dinomap) is 97 * brought in from disk and placed in virtual memory. 98 * 99 * PARAMETERS: 100 * ipimap - pointer to inode map inode for the aggregate or fileset. 101 * 102 * RETURN VALUES: 103 * 0 - success 104 * -ENOMEM - insufficient free virtual memory. 105 * -EIO - i/o error. 106 */ 107 int diMount(struct inode *ipimap) 108 { 109 struct inomap *imap; 110 struct metapage *mp; 111 int index; 112 struct dinomap_disk *dinom_le; 113 114 /* 115 * allocate/initialize the in-memory inode map control structure 116 */ 117 /* allocate the in-memory inode map control structure. */ 118 imap = kmalloc(sizeof(struct inomap), GFP_KERNEL); 119 if (imap == NULL) { 120 jfs_err("diMount: kmalloc returned NULL!"); 121 return -ENOMEM; 122 } 123 124 /* read the on-disk inode map control structure. */ 125 126 mp = read_metapage(ipimap, 127 IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage, 128 PSIZE, 0); 129 if (mp == NULL) { 130 kfree(imap); 131 return -EIO; 132 } 133 134 /* copy the on-disk version to the in-memory version. */ 135 dinom_le = (struct dinomap_disk *) mp->data; 136 imap->im_freeiag = le32_to_cpu(dinom_le->in_freeiag); 137 imap->im_nextiag = le32_to_cpu(dinom_le->in_nextiag); 138 atomic_set(&imap->im_numinos, le32_to_cpu(dinom_le->in_numinos)); 139 atomic_set(&imap->im_numfree, le32_to_cpu(dinom_le->in_numfree)); 140 imap->im_nbperiext = le32_to_cpu(dinom_le->in_nbperiext); 141 imap->im_l2nbperiext = le32_to_cpu(dinom_le->in_l2nbperiext); 142 for (index = 0; index < MAXAG; index++) { 143 imap->im_agctl[index].inofree = 144 le32_to_cpu(dinom_le->in_agctl[index].inofree); 145 imap->im_agctl[index].extfree = 146 le32_to_cpu(dinom_le->in_agctl[index].extfree); 147 imap->im_agctl[index].numinos = 148 le32_to_cpu(dinom_le->in_agctl[index].numinos); 149 imap->im_agctl[index].numfree = 150 le32_to_cpu(dinom_le->in_agctl[index].numfree); 151 } 152 153 /* release the buffer. */ 154 release_metapage(mp); 155 156 /* 157 * allocate/initialize inode allocation map locks 158 */ 159 /* allocate and init iag free list lock */ 160 IAGFREE_LOCK_INIT(imap); 161 162 /* allocate and init ag list locks */ 163 for (index = 0; index < MAXAG; index++) { 164 AG_LOCK_INIT(imap, index); 165 } 166 167 /* bind the inode map inode and inode map control structure 168 * to each other. 169 */ 170 imap->im_ipimap = ipimap; 171 JFS_IP(ipimap)->i_imap = imap; 172 173 return (0); 174 } 175 176 177 /* 178 * NAME: diUnmount() 179 * 180 * FUNCTION: write to disk the incore inode map control structures for 181 * a fileset or aggregate at unmount time. 182 * 183 * PARAMETERS: 184 * ipimap - pointer to inode map inode for the aggregate or fileset. 185 * 186 * RETURN VALUES: 187 * 0 - success 188 * -ENOMEM - insufficient free virtual memory. 189 * -EIO - i/o error. 190 */ 191 int diUnmount(struct inode *ipimap, int mounterror) 192 { 193 struct inomap *imap = JFS_IP(ipimap)->i_imap; 194 195 /* 196 * update the on-disk inode map control structure 197 */ 198 199 if (!(mounterror || isReadOnly(ipimap))) 200 diSync(ipimap); 201 202 /* 203 * Invalidate the page cache buffers 204 */ 205 truncate_inode_pages(ipimap->i_mapping, 0); 206 207 /* 208 * free in-memory control structure 209 */ 210 kfree(imap); 211 212 return (0); 213 } 214 215 216 /* 217 * diSync() 218 */ 219 int diSync(struct inode *ipimap) 220 { 221 struct dinomap_disk *dinom_le; 222 struct inomap *imp = JFS_IP(ipimap)->i_imap; 223 struct metapage *mp; 224 int index; 225 226 /* 227 * write imap global conrol page 228 */ 229 /* read the on-disk inode map control structure */ 230 mp = get_metapage(ipimap, 231 IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage, 232 PSIZE, 0); 233 if (mp == NULL) { 234 jfs_err("diSync: get_metapage failed!"); 235 return -EIO; 236 } 237 238 /* copy the in-memory version to the on-disk version */ 239 dinom_le = (struct dinomap_disk *) mp->data; 240 dinom_le->in_freeiag = cpu_to_le32(imp->im_freeiag); 241 dinom_le->in_nextiag = cpu_to_le32(imp->im_nextiag); 242 dinom_le->in_numinos = cpu_to_le32(atomic_read(&imp->im_numinos)); 243 dinom_le->in_numfree = cpu_to_le32(atomic_read(&imp->im_numfree)); 244 dinom_le->in_nbperiext = cpu_to_le32(imp->im_nbperiext); 245 dinom_le->in_l2nbperiext = cpu_to_le32(imp->im_l2nbperiext); 246 for (index = 0; index < MAXAG; index++) { 247 dinom_le->in_agctl[index].inofree = 248 cpu_to_le32(imp->im_agctl[index].inofree); 249 dinom_le->in_agctl[index].extfree = 250 cpu_to_le32(imp->im_agctl[index].extfree); 251 dinom_le->in_agctl[index].numinos = 252 cpu_to_le32(imp->im_agctl[index].numinos); 253 dinom_le->in_agctl[index].numfree = 254 cpu_to_le32(imp->im_agctl[index].numfree); 255 } 256 257 /* write out the control structure */ 258 write_metapage(mp); 259 260 /* 261 * write out dirty pages of imap 262 */ 263 filemap_write_and_wait(ipimap->i_mapping); 264 265 diWriteSpecial(ipimap, 0); 266 267 return (0); 268 } 269 270 271 /* 272 * NAME: diRead() 273 * 274 * FUNCTION: initialize an incore inode from disk. 275 * 276 * on entry, the specifed incore inode should itself 277 * specify the disk inode number corresponding to the 278 * incore inode (i.e. i_number should be initialized). 279 * 280 * this routine handles incore inode initialization for 281 * both "special" and "regular" inodes. special inodes 282 * are those required early in the mount process and 283 * require special handling since much of the file system 284 * is not yet initialized. these "special" inodes are 285 * identified by a NULL inode map inode pointer and are 286 * actually initialized by a call to diReadSpecial(). 287 * 288 * for regular inodes, the iag describing the disk inode 289 * is read from disk to determine the inode extent address 290 * for the disk inode. with the inode extent address in 291 * hand, the page of the extent that contains the disk 292 * inode is read and the disk inode is copied to the 293 * incore inode. 294 * 295 * PARAMETERS: 296 * ip - pointer to incore inode to be initialized from disk. 297 * 298 * RETURN VALUES: 299 * 0 - success 300 * -EIO - i/o error. 301 * -ENOMEM - insufficient memory 302 * 303 */ 304 int diRead(struct inode *ip) 305 { 306 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); 307 int iagno, ino, extno, rc; 308 struct inode *ipimap; 309 struct dinode *dp; 310 struct iag *iagp; 311 struct metapage *mp; 312 s64 blkno, agstart; 313 struct inomap *imap; 314 int block_offset; 315 int inodes_left; 316 unsigned long pageno; 317 int rel_inode; 318 319 jfs_info("diRead: ino = %ld", ip->i_ino); 320 321 ipimap = sbi->ipimap; 322 JFS_IP(ip)->ipimap = ipimap; 323 324 /* determine the iag number for this inode (number) */ 325 iagno = INOTOIAG(ip->i_ino); 326 327 /* read the iag */ 328 imap = JFS_IP(ipimap)->i_imap; 329 IREAD_LOCK(ipimap, RDWRLOCK_IMAP); 330 rc = diIAGRead(imap, iagno, &mp); 331 IREAD_UNLOCK(ipimap); 332 if (rc) { 333 jfs_err("diRead: diIAGRead returned %d", rc); 334 return (rc); 335 } 336 337 iagp = (struct iag *) mp->data; 338 339 /* determine inode extent that holds the disk inode */ 340 ino = ip->i_ino & (INOSPERIAG - 1); 341 extno = ino >> L2INOSPEREXT; 342 343 if ((lengthPXD(&iagp->inoext[extno]) != imap->im_nbperiext) || 344 (addressPXD(&iagp->inoext[extno]) == 0)) { 345 release_metapage(mp); 346 return -ESTALE; 347 } 348 349 /* get disk block number of the page within the inode extent 350 * that holds the disk inode. 351 */ 352 blkno = INOPBLK(&iagp->inoext[extno], ino, sbi->l2nbperpage); 353 354 /* get the ag for the iag */ 355 agstart = le64_to_cpu(iagp->agstart); 356 357 release_metapage(mp); 358 359 rel_inode = (ino & (INOSPERPAGE - 1)); 360 pageno = blkno >> sbi->l2nbperpage; 361 362 if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) { 363 /* 364 * OS/2 didn't always align inode extents on page boundaries 365 */ 366 inodes_left = 367 (sbi->nbperpage - block_offset) << sbi->l2niperblk; 368 369 if (rel_inode < inodes_left) 370 rel_inode += block_offset << sbi->l2niperblk; 371 else { 372 pageno += 1; 373 rel_inode -= inodes_left; 374 } 375 } 376 377 /* read the page of disk inode */ 378 mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1); 379 if (!mp) { 380 jfs_err("diRead: read_metapage failed"); 381 return -EIO; 382 } 383 384 /* locate the disk inode requested */ 385 dp = (struct dinode *) mp->data; 386 dp += rel_inode; 387 388 if (ip->i_ino != le32_to_cpu(dp->di_number)) { 389 jfs_error(ip->i_sb, "diRead: i_ino != di_number"); 390 rc = -EIO; 391 } else if (le32_to_cpu(dp->di_nlink) == 0) 392 rc = -ESTALE; 393 else 394 /* copy the disk inode to the in-memory inode */ 395 rc = copy_from_dinode(dp, ip); 396 397 release_metapage(mp); 398 399 /* set the ag for the inode */ 400 JFS_IP(ip)->agstart = agstart; 401 JFS_IP(ip)->active_ag = -1; 402 403 return (rc); 404 } 405 406 407 /* 408 * NAME: diReadSpecial() 409 * 410 * FUNCTION: initialize a 'special' inode from disk. 411 * 412 * this routines handles aggregate level inodes. The 413 * inode cache cannot differentiate between the 414 * aggregate inodes and the filesystem inodes, so we 415 * handle these here. We don't actually use the aggregate 416 * inode map, since these inodes are at a fixed location 417 * and in some cases the aggregate inode map isn't initialized 418 * yet. 419 * 420 * PARAMETERS: 421 * sb - filesystem superblock 422 * inum - aggregate inode number 423 * secondary - 1 if secondary aggregate inode table 424 * 425 * RETURN VALUES: 426 * new inode - success 427 * NULL - i/o error. 428 */ 429 struct inode *diReadSpecial(struct super_block *sb, ino_t inum, int secondary) 430 { 431 struct jfs_sb_info *sbi = JFS_SBI(sb); 432 uint address; 433 struct dinode *dp; 434 struct inode *ip; 435 struct metapage *mp; 436 437 ip = new_inode(sb); 438 if (ip == NULL) { 439 jfs_err("diReadSpecial: new_inode returned NULL!"); 440 return ip; 441 } 442 443 if (secondary) { 444 address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage; 445 JFS_IP(ip)->ipimap = sbi->ipaimap2; 446 } else { 447 address = AITBL_OFF >> L2PSIZE; 448 JFS_IP(ip)->ipimap = sbi->ipaimap; 449 } 450 451 ASSERT(inum < INOSPEREXT); 452 453 ip->i_ino = inum; 454 455 address += inum >> 3; /* 8 inodes per 4K page */ 456 457 /* read the page of fixed disk inode (AIT) in raw mode */ 458 mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1); 459 if (mp == NULL) { 460 set_nlink(ip, 1); /* Don't want iput() deleting it */ 461 iput(ip); 462 return (NULL); 463 } 464 465 /* get the pointer to the disk inode of interest */ 466 dp = (struct dinode *) (mp->data); 467 dp += inum % 8; /* 8 inodes per 4K page */ 468 469 /* copy on-disk inode to in-memory inode */ 470 if ((copy_from_dinode(dp, ip)) != 0) { 471 /* handle bad return by returning NULL for ip */ 472 set_nlink(ip, 1); /* Don't want iput() deleting it */ 473 iput(ip); 474 /* release the page */ 475 release_metapage(mp); 476 return (NULL); 477 478 } 479 480 ip->i_mapping->a_ops = &jfs_metapage_aops; 481 mapping_set_gfp_mask(ip->i_mapping, GFP_NOFS); 482 483 /* Allocations to metadata inodes should not affect quotas */ 484 ip->i_flags |= S_NOQUOTA; 485 486 if ((inum == FILESYSTEM_I) && (JFS_IP(ip)->ipimap == sbi->ipaimap)) { 487 sbi->gengen = le32_to_cpu(dp->di_gengen); 488 sbi->inostamp = le32_to_cpu(dp->di_inostamp); 489 } 490 491 /* release the page */ 492 release_metapage(mp); 493 494 /* 495 * __mark_inode_dirty expects inodes to be hashed. Since we don't 496 * want special inodes in the fileset inode space, we make them 497 * appear hashed, but do not put on any lists. hlist_del() 498 * will work fine and require no locking. 499 */ 500 hlist_add_fake(&ip->i_hash); 501 502 return (ip); 503 } 504 505 /* 506 * NAME: diWriteSpecial() 507 * 508 * FUNCTION: Write the special inode to disk 509 * 510 * PARAMETERS: 511 * ip - special inode 512 * secondary - 1 if secondary aggregate inode table 513 * 514 * RETURN VALUES: none 515 */ 516 517 void diWriteSpecial(struct inode *ip, int secondary) 518 { 519 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); 520 uint address; 521 struct dinode *dp; 522 ino_t inum = ip->i_ino; 523 struct metapage *mp; 524 525 if (secondary) 526 address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage; 527 else 528 address = AITBL_OFF >> L2PSIZE; 529 530 ASSERT(inum < INOSPEREXT); 531 532 address += inum >> 3; /* 8 inodes per 4K page */ 533 534 /* read the page of fixed disk inode (AIT) in raw mode */ 535 mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1); 536 if (mp == NULL) { 537 jfs_err("diWriteSpecial: failed to read aggregate inode " 538 "extent!"); 539 return; 540 } 541 542 /* get the pointer to the disk inode of interest */ 543 dp = (struct dinode *) (mp->data); 544 dp += inum % 8; /* 8 inodes per 4K page */ 545 546 /* copy on-disk inode to in-memory inode */ 547 copy_to_dinode(dp, ip); 548 memcpy(&dp->di_xtroot, &JFS_IP(ip)->i_xtroot, 288); 549 550 if (inum == FILESYSTEM_I) 551 dp->di_gengen = cpu_to_le32(sbi->gengen); 552 553 /* write the page */ 554 write_metapage(mp); 555 } 556 557 /* 558 * NAME: diFreeSpecial() 559 * 560 * FUNCTION: Free allocated space for special inode 561 */ 562 void diFreeSpecial(struct inode *ip) 563 { 564 if (ip == NULL) { 565 jfs_err("diFreeSpecial called with NULL ip!"); 566 return; 567 } 568 filemap_write_and_wait(ip->i_mapping); 569 truncate_inode_pages(ip->i_mapping, 0); 570 iput(ip); 571 } 572 573 574 575 /* 576 * NAME: diWrite() 577 * 578 * FUNCTION: write the on-disk inode portion of the in-memory inode 579 * to its corresponding on-disk inode. 580 * 581 * on entry, the specifed incore inode should itself 582 * specify the disk inode number corresponding to the 583 * incore inode (i.e. i_number should be initialized). 584 * 585 * the inode contains the inode extent address for the disk 586 * inode. with the inode extent address in hand, the 587 * page of the extent that contains the disk inode is 588 * read and the disk inode portion of the incore inode 589 * is copied to the disk inode. 590 * 591 * PARAMETERS: 592 * tid - transacation id 593 * ip - pointer to incore inode to be written to the inode extent. 594 * 595 * RETURN VALUES: 596 * 0 - success 597 * -EIO - i/o error. 598 */ 599 int diWrite(tid_t tid, struct inode *ip) 600 { 601 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); 602 struct jfs_inode_info *jfs_ip = JFS_IP(ip); 603 int rc = 0; 604 s32 ino; 605 struct dinode *dp; 606 s64 blkno; 607 int block_offset; 608 int inodes_left; 609 struct metapage *mp; 610 unsigned long pageno; 611 int rel_inode; 612 int dioffset; 613 struct inode *ipimap; 614 uint type; 615 lid_t lid; 616 struct tlock *ditlck, *tlck; 617 struct linelock *dilinelock, *ilinelock; 618 struct lv *lv; 619 int n; 620 621 ipimap = jfs_ip->ipimap; 622 623 ino = ip->i_ino & (INOSPERIAG - 1); 624 625 if (!addressPXD(&(jfs_ip->ixpxd)) || 626 (lengthPXD(&(jfs_ip->ixpxd)) != 627 JFS_IP(ipimap)->i_imap->im_nbperiext)) { 628 jfs_error(ip->i_sb, "diWrite: ixpxd invalid"); 629 return -EIO; 630 } 631 632 /* 633 * read the page of disk inode containing the specified inode: 634 */ 635 /* compute the block address of the page */ 636 blkno = INOPBLK(&(jfs_ip->ixpxd), ino, sbi->l2nbperpage); 637 638 rel_inode = (ino & (INOSPERPAGE - 1)); 639 pageno = blkno >> sbi->l2nbperpage; 640 641 if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) { 642 /* 643 * OS/2 didn't always align inode extents on page boundaries 644 */ 645 inodes_left = 646 (sbi->nbperpage - block_offset) << sbi->l2niperblk; 647 648 if (rel_inode < inodes_left) 649 rel_inode += block_offset << sbi->l2niperblk; 650 else { 651 pageno += 1; 652 rel_inode -= inodes_left; 653 } 654 } 655 /* read the page of disk inode */ 656 retry: 657 mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1); 658 if (!mp) 659 return -EIO; 660 661 /* get the pointer to the disk inode */ 662 dp = (struct dinode *) mp->data; 663 dp += rel_inode; 664 665 dioffset = (ino & (INOSPERPAGE - 1)) << L2DISIZE; 666 667 /* 668 * acquire transaction lock on the on-disk inode; 669 * N.B. tlock is acquired on ipimap not ip; 670 */ 671 if ((ditlck = 672 txLock(tid, ipimap, mp, tlckINODE | tlckENTRY)) == NULL) 673 goto retry; 674 dilinelock = (struct linelock *) & ditlck->lock; 675 676 /* 677 * copy btree root from in-memory inode to on-disk inode 678 * 679 * (tlock is taken from inline B+-tree root in in-memory 680 * inode when the B+-tree root is updated, which is pointed 681 * by jfs_ip->blid as well as being on tx tlock list) 682 * 683 * further processing of btree root is based on the copy 684 * in in-memory inode, where txLog() will log from, and, 685 * for xtree root, txUpdateMap() will update map and reset 686 * XAD_NEW bit; 687 */ 688 689 if (S_ISDIR(ip->i_mode) && (lid = jfs_ip->xtlid)) { 690 /* 691 * This is the special xtree inside the directory for storing 692 * the directory table 693 */ 694 xtpage_t *p, *xp; 695 xad_t *xad; 696 697 jfs_ip->xtlid = 0; 698 tlck = lid_to_tlock(lid); 699 assert(tlck->type & tlckXTREE); 700 tlck->type |= tlckBTROOT; 701 tlck->mp = mp; 702 ilinelock = (struct linelock *) & tlck->lock; 703 704 /* 705 * copy xtree root from inode to dinode: 706 */ 707 p = &jfs_ip->i_xtroot; 708 xp = (xtpage_t *) &dp->di_dirtable; 709 lv = ilinelock->lv; 710 for (n = 0; n < ilinelock->index; n++, lv++) { 711 memcpy(&xp->xad[lv->offset], &p->xad[lv->offset], 712 lv->length << L2XTSLOTSIZE); 713 } 714 715 /* reset on-disk (metadata page) xtree XAD_NEW bit */ 716 xad = &xp->xad[XTENTRYSTART]; 717 for (n = XTENTRYSTART; 718 n < le16_to_cpu(xp->header.nextindex); n++, xad++) 719 if (xad->flag & (XAD_NEW | XAD_EXTENDED)) 720 xad->flag &= ~(XAD_NEW | XAD_EXTENDED); 721 } 722 723 if ((lid = jfs_ip->blid) == 0) 724 goto inlineData; 725 jfs_ip->blid = 0; 726 727 tlck = lid_to_tlock(lid); 728 type = tlck->type; 729 tlck->type |= tlckBTROOT; 730 tlck->mp = mp; 731 ilinelock = (struct linelock *) & tlck->lock; 732 733 /* 734 * regular file: 16 byte (XAD slot) granularity 735 */ 736 if (type & tlckXTREE) { 737 xtpage_t *p, *xp; 738 xad_t *xad; 739 740 /* 741 * copy xtree root from inode to dinode: 742 */ 743 p = &jfs_ip->i_xtroot; 744 xp = &dp->di_xtroot; 745 lv = ilinelock->lv; 746 for (n = 0; n < ilinelock->index; n++, lv++) { 747 memcpy(&xp->xad[lv->offset], &p->xad[lv->offset], 748 lv->length << L2XTSLOTSIZE); 749 } 750 751 /* reset on-disk (metadata page) xtree XAD_NEW bit */ 752 xad = &xp->xad[XTENTRYSTART]; 753 for (n = XTENTRYSTART; 754 n < le16_to_cpu(xp->header.nextindex); n++, xad++) 755 if (xad->flag & (XAD_NEW | XAD_EXTENDED)) 756 xad->flag &= ~(XAD_NEW | XAD_EXTENDED); 757 } 758 /* 759 * directory: 32 byte (directory entry slot) granularity 760 */ 761 else if (type & tlckDTREE) { 762 dtpage_t *p, *xp; 763 764 /* 765 * copy dtree root from inode to dinode: 766 */ 767 p = (dtpage_t *) &jfs_ip->i_dtroot; 768 xp = (dtpage_t *) & dp->di_dtroot; 769 lv = ilinelock->lv; 770 for (n = 0; n < ilinelock->index; n++, lv++) { 771 memcpy(&xp->slot[lv->offset], &p->slot[lv->offset], 772 lv->length << L2DTSLOTSIZE); 773 } 774 } else { 775 jfs_err("diWrite: UFO tlock"); 776 } 777 778 inlineData: 779 /* 780 * copy inline symlink from in-memory inode to on-disk inode 781 */ 782 if (S_ISLNK(ip->i_mode) && ip->i_size < IDATASIZE) { 783 lv = & dilinelock->lv[dilinelock->index]; 784 lv->offset = (dioffset + 2 * 128) >> L2INODESLOTSIZE; 785 lv->length = 2; 786 memcpy(&dp->di_fastsymlink, jfs_ip->i_inline, IDATASIZE); 787 dilinelock->index++; 788 } 789 /* 790 * copy inline data from in-memory inode to on-disk inode: 791 * 128 byte slot granularity 792 */ 793 if (test_cflag(COMMIT_Inlineea, ip)) { 794 lv = & dilinelock->lv[dilinelock->index]; 795 lv->offset = (dioffset + 3 * 128) >> L2INODESLOTSIZE; 796 lv->length = 1; 797 memcpy(&dp->di_inlineea, jfs_ip->i_inline_ea, INODESLOTSIZE); 798 dilinelock->index++; 799 800 clear_cflag(COMMIT_Inlineea, ip); 801 } 802 803 /* 804 * lock/copy inode base: 128 byte slot granularity 805 */ 806 lv = & dilinelock->lv[dilinelock->index]; 807 lv->offset = dioffset >> L2INODESLOTSIZE; 808 copy_to_dinode(dp, ip); 809 if (test_and_clear_cflag(COMMIT_Dirtable, ip)) { 810 lv->length = 2; 811 memcpy(&dp->di_dirtable, &jfs_ip->i_dirtable, 96); 812 } else 813 lv->length = 1; 814 dilinelock->index++; 815 816 /* release the buffer holding the updated on-disk inode. 817 * the buffer will be later written by commit processing. 818 */ 819 write_metapage(mp); 820 821 return (rc); 822 } 823 824 825 /* 826 * NAME: diFree(ip) 827 * 828 * FUNCTION: free a specified inode from the inode working map 829 * for a fileset or aggregate. 830 * 831 * if the inode to be freed represents the first (only) 832 * free inode within the iag, the iag will be placed on 833 * the ag free inode list. 834 * 835 * freeing the inode will cause the inode extent to be 836 * freed if the inode is the only allocated inode within 837 * the extent. in this case all the disk resource backing 838 * up the inode extent will be freed. in addition, the iag 839 * will be placed on the ag extent free list if the extent 840 * is the first free extent in the iag. if freeing the 841 * extent also means that no free inodes will exist for 842 * the iag, the iag will also be removed from the ag free 843 * inode list. 844 * 845 * the iag describing the inode will be freed if the extent 846 * is to be freed and it is the only backed extent within 847 * the iag. in this case, the iag will be removed from the 848 * ag free extent list and ag free inode list and placed on 849 * the inode map's free iag list. 850 * 851 * a careful update approach is used to provide consistency 852 * in the face of updates to multiple buffers. under this 853 * approach, all required buffers are obtained before making 854 * any updates and are held until all updates are complete. 855 * 856 * PARAMETERS: 857 * ip - inode to be freed. 858 * 859 * RETURN VALUES: 860 * 0 - success 861 * -EIO - i/o error. 862 */ 863 int diFree(struct inode *ip) 864 { 865 int rc; 866 ino_t inum = ip->i_ino; 867 struct iag *iagp, *aiagp, *biagp, *ciagp, *diagp; 868 struct metapage *mp, *amp, *bmp, *cmp, *dmp; 869 int iagno, ino, extno, bitno, sword, agno; 870 int back, fwd; 871 u32 bitmap, mask; 872 struct inode *ipimap = JFS_SBI(ip->i_sb)->ipimap; 873 struct inomap *imap = JFS_IP(ipimap)->i_imap; 874 pxd_t freepxd; 875 tid_t tid; 876 struct inode *iplist[3]; 877 struct tlock *tlck; 878 struct pxd_lock *pxdlock; 879 880 /* 881 * This is just to suppress compiler warnings. The same logic that 882 * references these variables is used to initialize them. 883 */ 884 aiagp = biagp = ciagp = diagp = NULL; 885 886 /* get the iag number containing the inode. 887 */ 888 iagno = INOTOIAG(inum); 889 890 /* make sure that the iag is contained within 891 * the map. 892 */ 893 if (iagno >= imap->im_nextiag) { 894 print_hex_dump(KERN_ERR, "imap: ", DUMP_PREFIX_ADDRESS, 16, 4, 895 imap, 32, 0); 896 jfs_error(ip->i_sb, 897 "diFree: inum = %d, iagno = %d, nextiag = %d", 898 (uint) inum, iagno, imap->im_nextiag); 899 return -EIO; 900 } 901 902 /* get the allocation group for this ino. 903 */ 904 agno = BLKTOAG(JFS_IP(ip)->agstart, JFS_SBI(ip->i_sb)); 905 906 /* Lock the AG specific inode map information 907 */ 908 AG_LOCK(imap, agno); 909 910 /* Obtain read lock in imap inode. Don't release it until we have 911 * read all of the IAG's that we are going to. 912 */ 913 IREAD_LOCK(ipimap, RDWRLOCK_IMAP); 914 915 /* read the iag. 916 */ 917 if ((rc = diIAGRead(imap, iagno, &mp))) { 918 IREAD_UNLOCK(ipimap); 919 AG_UNLOCK(imap, agno); 920 return (rc); 921 } 922 iagp = (struct iag *) mp->data; 923 924 /* get the inode number and extent number of the inode within 925 * the iag and the inode number within the extent. 926 */ 927 ino = inum & (INOSPERIAG - 1); 928 extno = ino >> L2INOSPEREXT; 929 bitno = ino & (INOSPEREXT - 1); 930 mask = HIGHORDER >> bitno; 931 932 if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) { 933 jfs_error(ip->i_sb, 934 "diFree: wmap shows inode already free"); 935 } 936 937 if (!addressPXD(&iagp->inoext[extno])) { 938 release_metapage(mp); 939 IREAD_UNLOCK(ipimap); 940 AG_UNLOCK(imap, agno); 941 jfs_error(ip->i_sb, "diFree: invalid inoext"); 942 return -EIO; 943 } 944 945 /* compute the bitmap for the extent reflecting the freed inode. 946 */ 947 bitmap = le32_to_cpu(iagp->wmap[extno]) & ~mask; 948 949 if (imap->im_agctl[agno].numfree > imap->im_agctl[agno].numinos) { 950 release_metapage(mp); 951 IREAD_UNLOCK(ipimap); 952 AG_UNLOCK(imap, agno); 953 jfs_error(ip->i_sb, "diFree: numfree > numinos"); 954 return -EIO; 955 } 956 /* 957 * inode extent still has some inodes or below low water mark: 958 * keep the inode extent; 959 */ 960 if (bitmap || 961 imap->im_agctl[agno].numfree < 96 || 962 (imap->im_agctl[agno].numfree < 288 && 963 (((imap->im_agctl[agno].numfree * 100) / 964 imap->im_agctl[agno].numinos) <= 25))) { 965 /* if the iag currently has no free inodes (i.e., 966 * the inode being freed is the first free inode of iag), 967 * insert the iag at head of the inode free list for the ag. 968 */ 969 if (iagp->nfreeinos == 0) { 970 /* check if there are any iags on the ag inode 971 * free list. if so, read the first one so that 972 * we can link the current iag onto the list at 973 * the head. 974 */ 975 if ((fwd = imap->im_agctl[agno].inofree) >= 0) { 976 /* read the iag that currently is the head 977 * of the list. 978 */ 979 if ((rc = diIAGRead(imap, fwd, &))) { 980 IREAD_UNLOCK(ipimap); 981 AG_UNLOCK(imap, agno); 982 release_metapage(mp); 983 return (rc); 984 } 985 aiagp = (struct iag *) amp->data; 986 987 /* make current head point back to the iag. 988 */ 989 aiagp->inofreeback = cpu_to_le32(iagno); 990 991 write_metapage(amp); 992 } 993 994 /* iag points forward to current head and iag 995 * becomes the new head of the list. 996 */ 997 iagp->inofreefwd = 998 cpu_to_le32(imap->im_agctl[agno].inofree); 999 iagp->inofreeback = cpu_to_le32(-1); 1000 imap->im_agctl[agno].inofree = iagno; 1001 } 1002 IREAD_UNLOCK(ipimap); 1003 1004 /* update the free inode summary map for the extent if 1005 * freeing the inode means the extent will now have free 1006 * inodes (i.e., the inode being freed is the first free 1007 * inode of extent), 1008 */ 1009 if (iagp->wmap[extno] == cpu_to_le32(ONES)) { 1010 sword = extno >> L2EXTSPERSUM; 1011 bitno = extno & (EXTSPERSUM - 1); 1012 iagp->inosmap[sword] &= 1013 cpu_to_le32(~(HIGHORDER >> bitno)); 1014 } 1015 1016 /* update the bitmap. 1017 */ 1018 iagp->wmap[extno] = cpu_to_le32(bitmap); 1019 1020 /* update the free inode counts at the iag, ag and 1021 * map level. 1022 */ 1023 le32_add_cpu(&iagp->nfreeinos, 1); 1024 imap->im_agctl[agno].numfree += 1; 1025 atomic_inc(&imap->im_numfree); 1026 1027 /* release the AG inode map lock 1028 */ 1029 AG_UNLOCK(imap, agno); 1030 1031 /* write the iag */ 1032 write_metapage(mp); 1033 1034 return (0); 1035 } 1036 1037 1038 /* 1039 * inode extent has become free and above low water mark: 1040 * free the inode extent; 1041 */ 1042 1043 /* 1044 * prepare to update iag list(s) (careful update step 1) 1045 */ 1046 amp = bmp = cmp = dmp = NULL; 1047 fwd = back = -1; 1048 1049 /* check if the iag currently has no free extents. if so, 1050 * it will be placed on the head of the ag extent free list. 1051 */ 1052 if (iagp->nfreeexts == 0) { 1053 /* check if the ag extent free list has any iags. 1054 * if so, read the iag at the head of the list now. 1055 * this (head) iag will be updated later to reflect 1056 * the addition of the current iag at the head of 1057 * the list. 1058 */ 1059 if ((fwd = imap->im_agctl[agno].extfree) >= 0) { 1060 if ((rc = diIAGRead(imap, fwd, &))) 1061 goto error_out; 1062 aiagp = (struct iag *) amp->data; 1063 } 1064 } else { 1065 /* iag has free extents. check if the addition of a free 1066 * extent will cause all extents to be free within this 1067 * iag. if so, the iag will be removed from the ag extent 1068 * free list and placed on the inode map's free iag list. 1069 */ 1070 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) { 1071 /* in preparation for removing the iag from the 1072 * ag extent free list, read the iags preceding 1073 * and following the iag on the ag extent free 1074 * list. 1075 */ 1076 if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) { 1077 if ((rc = diIAGRead(imap, fwd, &))) 1078 goto error_out; 1079 aiagp = (struct iag *) amp->data; 1080 } 1081 1082 if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) { 1083 if ((rc = diIAGRead(imap, back, &bmp))) 1084 goto error_out; 1085 biagp = (struct iag *) bmp->data; 1086 } 1087 } 1088 } 1089 1090 /* remove the iag from the ag inode free list if freeing 1091 * this extent cause the iag to have no free inodes. 1092 */ 1093 if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) { 1094 int inofreeback = le32_to_cpu(iagp->inofreeback); 1095 int inofreefwd = le32_to_cpu(iagp->inofreefwd); 1096 1097 /* in preparation for removing the iag from the 1098 * ag inode free list, read the iags preceding 1099 * and following the iag on the ag inode free 1100 * list. before reading these iags, we must make 1101 * sure that we already don't have them in hand 1102 * from up above, since re-reading an iag (buffer) 1103 * we are currently holding would cause a deadlock. 1104 */ 1105 if (inofreefwd >= 0) { 1106 1107 if (inofreefwd == fwd) 1108 ciagp = (struct iag *) amp->data; 1109 else if (inofreefwd == back) 1110 ciagp = (struct iag *) bmp->data; 1111 else { 1112 if ((rc = 1113 diIAGRead(imap, inofreefwd, &cmp))) 1114 goto error_out; 1115 ciagp = (struct iag *) cmp->data; 1116 } 1117 assert(ciagp != NULL); 1118 } 1119 1120 if (inofreeback >= 0) { 1121 if (inofreeback == fwd) 1122 diagp = (struct iag *) amp->data; 1123 else if (inofreeback == back) 1124 diagp = (struct iag *) bmp->data; 1125 else { 1126 if ((rc = 1127 diIAGRead(imap, inofreeback, &dmp))) 1128 goto error_out; 1129 diagp = (struct iag *) dmp->data; 1130 } 1131 assert(diagp != NULL); 1132 } 1133 } 1134 1135 IREAD_UNLOCK(ipimap); 1136 1137 /* 1138 * invalidate any page of the inode extent freed from buffer cache; 1139 */ 1140 freepxd = iagp->inoext[extno]; 1141 invalidate_pxd_metapages(ip, freepxd); 1142 1143 /* 1144 * update iag list(s) (careful update step 2) 1145 */ 1146 /* add the iag to the ag extent free list if this is the 1147 * first free extent for the iag. 1148 */ 1149 if (iagp->nfreeexts == 0) { 1150 if (fwd >= 0) 1151 aiagp->extfreeback = cpu_to_le32(iagno); 1152 1153 iagp->extfreefwd = 1154 cpu_to_le32(imap->im_agctl[agno].extfree); 1155 iagp->extfreeback = cpu_to_le32(-1); 1156 imap->im_agctl[agno].extfree = iagno; 1157 } else { 1158 /* remove the iag from the ag extent list if all extents 1159 * are now free and place it on the inode map iag free list. 1160 */ 1161 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) { 1162 if (fwd >= 0) 1163 aiagp->extfreeback = iagp->extfreeback; 1164 1165 if (back >= 0) 1166 biagp->extfreefwd = iagp->extfreefwd; 1167 else 1168 imap->im_agctl[agno].extfree = 1169 le32_to_cpu(iagp->extfreefwd); 1170 1171 iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1); 1172 1173 IAGFREE_LOCK(imap); 1174 iagp->iagfree = cpu_to_le32(imap->im_freeiag); 1175 imap->im_freeiag = iagno; 1176 IAGFREE_UNLOCK(imap); 1177 } 1178 } 1179 1180 /* remove the iag from the ag inode free list if freeing 1181 * this extent causes the iag to have no free inodes. 1182 */ 1183 if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) { 1184 if ((int) le32_to_cpu(iagp->inofreefwd) >= 0) 1185 ciagp->inofreeback = iagp->inofreeback; 1186 1187 if ((int) le32_to_cpu(iagp->inofreeback) >= 0) 1188 diagp->inofreefwd = iagp->inofreefwd; 1189 else 1190 imap->im_agctl[agno].inofree = 1191 le32_to_cpu(iagp->inofreefwd); 1192 1193 iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1); 1194 } 1195 1196 /* update the inode extent address and working map 1197 * to reflect the free extent. 1198 * the permanent map should have been updated already 1199 * for the inode being freed. 1200 */ 1201 if (iagp->pmap[extno] != 0) { 1202 jfs_error(ip->i_sb, "diFree: the pmap does not show inode free"); 1203 } 1204 iagp->wmap[extno] = 0; 1205 PXDlength(&iagp->inoext[extno], 0); 1206 PXDaddress(&iagp->inoext[extno], 0); 1207 1208 /* update the free extent and free inode summary maps 1209 * to reflect the freed extent. 1210 * the inode summary map is marked to indicate no inodes 1211 * available for the freed extent. 1212 */ 1213 sword = extno >> L2EXTSPERSUM; 1214 bitno = extno & (EXTSPERSUM - 1); 1215 mask = HIGHORDER >> bitno; 1216 iagp->inosmap[sword] |= cpu_to_le32(mask); 1217 iagp->extsmap[sword] &= cpu_to_le32(~mask); 1218 1219 /* update the number of free inodes and number of free extents 1220 * for the iag. 1221 */ 1222 le32_add_cpu(&iagp->nfreeinos, -(INOSPEREXT - 1)); 1223 le32_add_cpu(&iagp->nfreeexts, 1); 1224 1225 /* update the number of free inodes and backed inodes 1226 * at the ag and inode map level. 1227 */ 1228 imap->im_agctl[agno].numfree -= (INOSPEREXT - 1); 1229 imap->im_agctl[agno].numinos -= INOSPEREXT; 1230 atomic_sub(INOSPEREXT - 1, &imap->im_numfree); 1231 atomic_sub(INOSPEREXT, &imap->im_numinos); 1232 1233 if (amp) 1234 write_metapage(amp); 1235 if (bmp) 1236 write_metapage(bmp); 1237 if (cmp) 1238 write_metapage(cmp); 1239 if (dmp) 1240 write_metapage(dmp); 1241 1242 /* 1243 * start transaction to update block allocation map 1244 * for the inode extent freed; 1245 * 1246 * N.B. AG_LOCK is released and iag will be released below, and 1247 * other thread may allocate inode from/reusing the ixad freed 1248 * BUT with new/different backing inode extent from the extent 1249 * to be freed by the transaction; 1250 */ 1251 tid = txBegin(ipimap->i_sb, COMMIT_FORCE); 1252 mutex_lock(&JFS_IP(ipimap)->commit_mutex); 1253 1254 /* acquire tlock of the iag page of the freed ixad 1255 * to force the page NOHOMEOK (even though no data is 1256 * logged from the iag page) until NOREDOPAGE|FREEXTENT log 1257 * for the free of the extent is committed; 1258 * write FREEXTENT|NOREDOPAGE log record 1259 * N.B. linelock is overlaid as freed extent descriptor; 1260 */ 1261 tlck = txLock(tid, ipimap, mp, tlckINODE | tlckFREE); 1262 pxdlock = (struct pxd_lock *) & tlck->lock; 1263 pxdlock->flag = mlckFREEPXD; 1264 pxdlock->pxd = freepxd; 1265 pxdlock->index = 1; 1266 1267 write_metapage(mp); 1268 1269 iplist[0] = ipimap; 1270 1271 /* 1272 * logredo needs the IAG number and IAG extent index in order 1273 * to ensure that the IMap is consistent. The least disruptive 1274 * way to pass these values through to the transaction manager 1275 * is in the iplist array. 1276 * 1277 * It's not pretty, but it works. 1278 */ 1279 iplist[1] = (struct inode *) (size_t)iagno; 1280 iplist[2] = (struct inode *) (size_t)extno; 1281 1282 rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE); 1283 1284 txEnd(tid); 1285 mutex_unlock(&JFS_IP(ipimap)->commit_mutex); 1286 1287 /* unlock the AG inode map information */ 1288 AG_UNLOCK(imap, agno); 1289 1290 return (0); 1291 1292 error_out: 1293 IREAD_UNLOCK(ipimap); 1294 1295 if (amp) 1296 release_metapage(amp); 1297 if (bmp) 1298 release_metapage(bmp); 1299 if (cmp) 1300 release_metapage(cmp); 1301 if (dmp) 1302 release_metapage(dmp); 1303 1304 AG_UNLOCK(imap, agno); 1305 1306 release_metapage(mp); 1307 1308 return (rc); 1309 } 1310 1311 /* 1312 * There are several places in the diAlloc* routines where we initialize 1313 * the inode. 1314 */ 1315 static inline void 1316 diInitInode(struct inode *ip, int iagno, int ino, int extno, struct iag * iagp) 1317 { 1318 struct jfs_inode_info *jfs_ip = JFS_IP(ip); 1319 1320 ip->i_ino = (iagno << L2INOSPERIAG) + ino; 1321 jfs_ip->ixpxd = iagp->inoext[extno]; 1322 jfs_ip->agstart = le64_to_cpu(iagp->agstart); 1323 jfs_ip->active_ag = -1; 1324 } 1325 1326 1327 /* 1328 * NAME: diAlloc(pip,dir,ip) 1329 * 1330 * FUNCTION: allocate a disk inode from the inode working map 1331 * for a fileset or aggregate. 1332 * 1333 * PARAMETERS: 1334 * pip - pointer to incore inode for the parent inode. 1335 * dir - 'true' if the new disk inode is for a directory. 1336 * ip - pointer to a new inode 1337 * 1338 * RETURN VALUES: 1339 * 0 - success. 1340 * -ENOSPC - insufficient disk resources. 1341 * -EIO - i/o error. 1342 */ 1343 int diAlloc(struct inode *pip, bool dir, struct inode *ip) 1344 { 1345 int rc, ino, iagno, addext, extno, bitno, sword; 1346 int nwords, rem, i, agno; 1347 u32 mask, inosmap, extsmap; 1348 struct inode *ipimap; 1349 struct metapage *mp; 1350 ino_t inum; 1351 struct iag *iagp; 1352 struct inomap *imap; 1353 1354 /* get the pointers to the inode map inode and the 1355 * corresponding imap control structure. 1356 */ 1357 ipimap = JFS_SBI(pip->i_sb)->ipimap; 1358 imap = JFS_IP(ipimap)->i_imap; 1359 JFS_IP(ip)->ipimap = ipimap; 1360 JFS_IP(ip)->fileset = FILESYSTEM_I; 1361 1362 /* for a directory, the allocation policy is to start 1363 * at the ag level using the preferred ag. 1364 */ 1365 if (dir) { 1366 agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap); 1367 AG_LOCK(imap, agno); 1368 goto tryag; 1369 } 1370 1371 /* for files, the policy starts off by trying to allocate from 1372 * the same iag containing the parent disk inode: 1373 * try to allocate the new disk inode close to the parent disk 1374 * inode, using parent disk inode number + 1 as the allocation 1375 * hint. (we use a left-to-right policy to attempt to avoid 1376 * moving backward on the disk.) compute the hint within the 1377 * file system and the iag. 1378 */ 1379 1380 /* get the ag number of this iag */ 1381 agno = BLKTOAG(JFS_IP(pip)->agstart, JFS_SBI(pip->i_sb)); 1382 1383 if (atomic_read(&JFS_SBI(pip->i_sb)->bmap->db_active[agno])) { 1384 /* 1385 * There is an open file actively growing. We want to 1386 * allocate new inodes from a different ag to avoid 1387 * fragmentation problems. 1388 */ 1389 agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap); 1390 AG_LOCK(imap, agno); 1391 goto tryag; 1392 } 1393 1394 inum = pip->i_ino + 1; 1395 ino = inum & (INOSPERIAG - 1); 1396 1397 /* back off the hint if it is outside of the iag */ 1398 if (ino == 0) 1399 inum = pip->i_ino; 1400 1401 /* lock the AG inode map information */ 1402 AG_LOCK(imap, agno); 1403 1404 /* Get read lock on imap inode */ 1405 IREAD_LOCK(ipimap, RDWRLOCK_IMAP); 1406 1407 /* get the iag number and read the iag */ 1408 iagno = INOTOIAG(inum); 1409 if ((rc = diIAGRead(imap, iagno, &mp))) { 1410 IREAD_UNLOCK(ipimap); 1411 AG_UNLOCK(imap, agno); 1412 return (rc); 1413 } 1414 iagp = (struct iag *) mp->data; 1415 1416 /* determine if new inode extent is allowed to be added to the iag. 1417 * new inode extent can be added to the iag if the ag 1418 * has less than 32 free disk inodes and the iag has free extents. 1419 */ 1420 addext = (imap->im_agctl[agno].numfree < 32 && iagp->nfreeexts); 1421 1422 /* 1423 * try to allocate from the IAG 1424 */ 1425 /* check if the inode may be allocated from the iag 1426 * (i.e. the inode has free inodes or new extent can be added). 1427 */ 1428 if (iagp->nfreeinos || addext) { 1429 /* determine the extent number of the hint. 1430 */ 1431 extno = ino >> L2INOSPEREXT; 1432 1433 /* check if the extent containing the hint has backed 1434 * inodes. if so, try to allocate within this extent. 1435 */ 1436 if (addressPXD(&iagp->inoext[extno])) { 1437 bitno = ino & (INOSPEREXT - 1); 1438 if ((bitno = 1439 diFindFree(le32_to_cpu(iagp->wmap[extno]), 1440 bitno)) 1441 < INOSPEREXT) { 1442 ino = (extno << L2INOSPEREXT) + bitno; 1443 1444 /* a free inode (bit) was found within this 1445 * extent, so allocate it. 1446 */ 1447 rc = diAllocBit(imap, iagp, ino); 1448 IREAD_UNLOCK(ipimap); 1449 if (rc) { 1450 assert(rc == -EIO); 1451 } else { 1452 /* set the results of the allocation 1453 * and write the iag. 1454 */ 1455 diInitInode(ip, iagno, ino, extno, 1456 iagp); 1457 mark_metapage_dirty(mp); 1458 } 1459 release_metapage(mp); 1460 1461 /* free the AG lock and return. 1462 */ 1463 AG_UNLOCK(imap, agno); 1464 return (rc); 1465 } 1466 1467 if (!addext) 1468 extno = 1469 (extno == 1470 EXTSPERIAG - 1) ? 0 : extno + 1; 1471 } 1472 1473 /* 1474 * no free inodes within the extent containing the hint. 1475 * 1476 * try to allocate from the backed extents following 1477 * hint or, if appropriate (i.e. addext is true), allocate 1478 * an extent of free inodes at or following the extent 1479 * containing the hint. 1480 * 1481 * the free inode and free extent summary maps are used 1482 * here, so determine the starting summary map position 1483 * and the number of words we'll have to examine. again, 1484 * the approach is to allocate following the hint, so we 1485 * might have to initially ignore prior bits of the summary 1486 * map that represent extents prior to the extent containing 1487 * the hint and later revisit these bits. 1488 */ 1489 bitno = extno & (EXTSPERSUM - 1); 1490 nwords = (bitno == 0) ? SMAPSZ : SMAPSZ + 1; 1491 sword = extno >> L2EXTSPERSUM; 1492 1493 /* mask any prior bits for the starting words of the 1494 * summary map. 1495 */ 1496 mask = (bitno == 0) ? 0 : (ONES << (EXTSPERSUM - bitno)); 1497 inosmap = le32_to_cpu(iagp->inosmap[sword]) | mask; 1498 extsmap = le32_to_cpu(iagp->extsmap[sword]) | mask; 1499 1500 /* scan the free inode and free extent summary maps for 1501 * free resources. 1502 */ 1503 for (i = 0; i < nwords; i++) { 1504 /* check if this word of the free inode summary 1505 * map describes an extent with free inodes. 1506 */ 1507 if (~inosmap) { 1508 /* an extent with free inodes has been 1509 * found. determine the extent number 1510 * and the inode number within the extent. 1511 */ 1512 rem = diFindFree(inosmap, 0); 1513 extno = (sword << L2EXTSPERSUM) + rem; 1514 rem = diFindFree(le32_to_cpu(iagp->wmap[extno]), 1515 0); 1516 if (rem >= INOSPEREXT) { 1517 IREAD_UNLOCK(ipimap); 1518 release_metapage(mp); 1519 AG_UNLOCK(imap, agno); 1520 jfs_error(ip->i_sb, 1521 "diAlloc: can't find free bit " 1522 "in wmap"); 1523 return -EIO; 1524 } 1525 1526 /* determine the inode number within the 1527 * iag and allocate the inode from the 1528 * map. 1529 */ 1530 ino = (extno << L2INOSPEREXT) + rem; 1531 rc = diAllocBit(imap, iagp, ino); 1532 IREAD_UNLOCK(ipimap); 1533 if (rc) 1534 assert(rc == -EIO); 1535 else { 1536 /* set the results of the allocation 1537 * and write the iag. 1538 */ 1539 diInitInode(ip, iagno, ino, extno, 1540 iagp); 1541 mark_metapage_dirty(mp); 1542 } 1543 release_metapage(mp); 1544 1545 /* free the AG lock and return. 1546 */ 1547 AG_UNLOCK(imap, agno); 1548 return (rc); 1549 1550 } 1551 1552 /* check if we may allocate an extent of free 1553 * inodes and whether this word of the free 1554 * extents summary map describes a free extent. 1555 */ 1556 if (addext && ~extsmap) { 1557 /* a free extent has been found. determine 1558 * the extent number. 1559 */ 1560 rem = diFindFree(extsmap, 0); 1561 extno = (sword << L2EXTSPERSUM) + rem; 1562 1563 /* allocate an extent of free inodes. 1564 */ 1565 if ((rc = diNewExt(imap, iagp, extno))) { 1566 /* if there is no disk space for a 1567 * new extent, try to allocate the 1568 * disk inode from somewhere else. 1569 */ 1570 if (rc == -ENOSPC) 1571 break; 1572 1573 assert(rc == -EIO); 1574 } else { 1575 /* set the results of the allocation 1576 * and write the iag. 1577 */ 1578 diInitInode(ip, iagno, 1579 extno << L2INOSPEREXT, 1580 extno, iagp); 1581 mark_metapage_dirty(mp); 1582 } 1583 release_metapage(mp); 1584 /* free the imap inode & the AG lock & return. 1585 */ 1586 IREAD_UNLOCK(ipimap); 1587 AG_UNLOCK(imap, agno); 1588 return (rc); 1589 } 1590 1591 /* move on to the next set of summary map words. 1592 */ 1593 sword = (sword == SMAPSZ - 1) ? 0 : sword + 1; 1594 inosmap = le32_to_cpu(iagp->inosmap[sword]); 1595 extsmap = le32_to_cpu(iagp->extsmap[sword]); 1596 } 1597 } 1598 /* unlock imap inode */ 1599 IREAD_UNLOCK(ipimap); 1600 1601 /* nothing doing in this iag, so release it. */ 1602 release_metapage(mp); 1603 1604 tryag: 1605 /* 1606 * try to allocate anywhere within the same AG as the parent inode. 1607 */ 1608 rc = diAllocAG(imap, agno, dir, ip); 1609 1610 AG_UNLOCK(imap, agno); 1611 1612 if (rc != -ENOSPC) 1613 return (rc); 1614 1615 /* 1616 * try to allocate in any AG. 1617 */ 1618 return (diAllocAny(imap, agno, dir, ip)); 1619 } 1620 1621 1622 /* 1623 * NAME: diAllocAG(imap,agno,dir,ip) 1624 * 1625 * FUNCTION: allocate a disk inode from the allocation group. 1626 * 1627 * this routine first determines if a new extent of free 1628 * inodes should be added for the allocation group, with 1629 * the current request satisfied from this extent. if this 1630 * is the case, an attempt will be made to do just that. if 1631 * this attempt fails or it has been determined that a new 1632 * extent should not be added, an attempt is made to satisfy 1633 * the request by allocating an existing (backed) free inode 1634 * from the allocation group. 1635 * 1636 * PRE CONDITION: Already have the AG lock for this AG. 1637 * 1638 * PARAMETERS: 1639 * imap - pointer to inode map control structure. 1640 * agno - allocation group to allocate from. 1641 * dir - 'true' if the new disk inode is for a directory. 1642 * ip - pointer to the new inode to be filled in on successful return 1643 * with the disk inode number allocated, its extent address 1644 * and the start of the ag. 1645 * 1646 * RETURN VALUES: 1647 * 0 - success. 1648 * -ENOSPC - insufficient disk resources. 1649 * -EIO - i/o error. 1650 */ 1651 static int 1652 diAllocAG(struct inomap * imap, int agno, bool dir, struct inode *ip) 1653 { 1654 int rc, addext, numfree, numinos; 1655 1656 /* get the number of free and the number of backed disk 1657 * inodes currently within the ag. 1658 */ 1659 numfree = imap->im_agctl[agno].numfree; 1660 numinos = imap->im_agctl[agno].numinos; 1661 1662 if (numfree > numinos) { 1663 jfs_error(ip->i_sb, "diAllocAG: numfree > numinos"); 1664 return -EIO; 1665 } 1666 1667 /* determine if we should allocate a new extent of free inodes 1668 * within the ag: for directory inodes, add a new extent 1669 * if there are a small number of free inodes or number of free 1670 * inodes is a small percentage of the number of backed inodes. 1671 */ 1672 if (dir) 1673 addext = (numfree < 64 || 1674 (numfree < 256 1675 && ((numfree * 100) / numinos) <= 20)); 1676 else 1677 addext = (numfree == 0); 1678 1679 /* 1680 * try to allocate a new extent of free inodes. 1681 */ 1682 if (addext) { 1683 /* if free space is not available for this new extent, try 1684 * below to allocate a free and existing (already backed) 1685 * inode from the ag. 1686 */ 1687 if ((rc = diAllocExt(imap, agno, ip)) != -ENOSPC) 1688 return (rc); 1689 } 1690 1691 /* 1692 * try to allocate an existing free inode from the ag. 1693 */ 1694 return (diAllocIno(imap, agno, ip)); 1695 } 1696 1697 1698 /* 1699 * NAME: diAllocAny(imap,agno,dir,iap) 1700 * 1701 * FUNCTION: allocate a disk inode from any other allocation group. 1702 * 1703 * this routine is called when an allocation attempt within 1704 * the primary allocation group has failed. if attempts to 1705 * allocate an inode from any allocation group other than the 1706 * specified primary group. 1707 * 1708 * PARAMETERS: 1709 * imap - pointer to inode map control structure. 1710 * agno - primary allocation group (to avoid). 1711 * dir - 'true' if the new disk inode is for a directory. 1712 * ip - pointer to a new inode to be filled in on successful return 1713 * with the disk inode number allocated, its extent address 1714 * and the start of the ag. 1715 * 1716 * RETURN VALUES: 1717 * 0 - success. 1718 * -ENOSPC - insufficient disk resources. 1719 * -EIO - i/o error. 1720 */ 1721 static int 1722 diAllocAny(struct inomap * imap, int agno, bool dir, struct inode *ip) 1723 { 1724 int ag, rc; 1725 int maxag = JFS_SBI(imap->im_ipimap->i_sb)->bmap->db_maxag; 1726 1727 1728 /* try to allocate from the ags following agno up to 1729 * the maximum ag number. 1730 */ 1731 for (ag = agno + 1; ag <= maxag; ag++) { 1732 AG_LOCK(imap, ag); 1733 1734 rc = diAllocAG(imap, ag, dir, ip); 1735 1736 AG_UNLOCK(imap, ag); 1737 1738 if (rc != -ENOSPC) 1739 return (rc); 1740 } 1741 1742 /* try to allocate from the ags in front of agno. 1743 */ 1744 for (ag = 0; ag < agno; ag++) { 1745 AG_LOCK(imap, ag); 1746 1747 rc = diAllocAG(imap, ag, dir, ip); 1748 1749 AG_UNLOCK(imap, ag); 1750 1751 if (rc != -ENOSPC) 1752 return (rc); 1753 } 1754 1755 /* no free disk inodes. 1756 */ 1757 return -ENOSPC; 1758 } 1759 1760 1761 /* 1762 * NAME: diAllocIno(imap,agno,ip) 1763 * 1764 * FUNCTION: allocate a disk inode from the allocation group's free 1765 * inode list, returning an error if this free list is 1766 * empty (i.e. no iags on the list). 1767 * 1768 * allocation occurs from the first iag on the list using 1769 * the iag's free inode summary map to find the leftmost 1770 * free inode in the iag. 1771 * 1772 * PRE CONDITION: Already have AG lock for this AG. 1773 * 1774 * PARAMETERS: 1775 * imap - pointer to inode map control structure. 1776 * agno - allocation group. 1777 * ip - pointer to new inode to be filled in on successful return 1778 * with the disk inode number allocated, its extent address 1779 * and the start of the ag. 1780 * 1781 * RETURN VALUES: 1782 * 0 - success. 1783 * -ENOSPC - insufficient disk resources. 1784 * -EIO - i/o error. 1785 */ 1786 static int diAllocIno(struct inomap * imap, int agno, struct inode *ip) 1787 { 1788 int iagno, ino, rc, rem, extno, sword; 1789 struct metapage *mp; 1790 struct iag *iagp; 1791 1792 /* check if there are iags on the ag's free inode list. 1793 */ 1794 if ((iagno = imap->im_agctl[agno].inofree) < 0) 1795 return -ENOSPC; 1796 1797 /* obtain read lock on imap inode */ 1798 IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP); 1799 1800 /* read the iag at the head of the list. 1801 */ 1802 if ((rc = diIAGRead(imap, iagno, &mp))) { 1803 IREAD_UNLOCK(imap->im_ipimap); 1804 return (rc); 1805 } 1806 iagp = (struct iag *) mp->data; 1807 1808 /* better be free inodes in this iag if it is on the 1809 * list. 1810 */ 1811 if (!iagp->nfreeinos) { 1812 IREAD_UNLOCK(imap->im_ipimap); 1813 release_metapage(mp); 1814 jfs_error(ip->i_sb, 1815 "diAllocIno: nfreeinos = 0, but iag on freelist"); 1816 return -EIO; 1817 } 1818 1819 /* scan the free inode summary map to find an extent 1820 * with free inodes. 1821 */ 1822 for (sword = 0;; sword++) { 1823 if (sword >= SMAPSZ) { 1824 IREAD_UNLOCK(imap->im_ipimap); 1825 release_metapage(mp); 1826 jfs_error(ip->i_sb, 1827 "diAllocIno: free inode not found in summary map"); 1828 return -EIO; 1829 } 1830 1831 if (~iagp->inosmap[sword]) 1832 break; 1833 } 1834 1835 /* found a extent with free inodes. determine 1836 * the extent number. 1837 */ 1838 rem = diFindFree(le32_to_cpu(iagp->inosmap[sword]), 0); 1839 if (rem >= EXTSPERSUM) { 1840 IREAD_UNLOCK(imap->im_ipimap); 1841 release_metapage(mp); 1842 jfs_error(ip->i_sb, "diAllocIno: no free extent found"); 1843 return -EIO; 1844 } 1845 extno = (sword << L2EXTSPERSUM) + rem; 1846 1847 /* find the first free inode in the extent. 1848 */ 1849 rem = diFindFree(le32_to_cpu(iagp->wmap[extno]), 0); 1850 if (rem >= INOSPEREXT) { 1851 IREAD_UNLOCK(imap->im_ipimap); 1852 release_metapage(mp); 1853 jfs_error(ip->i_sb, "diAllocIno: free inode not found"); 1854 return -EIO; 1855 } 1856 1857 /* compute the inode number within the iag. 1858 */ 1859 ino = (extno << L2INOSPEREXT) + rem; 1860 1861 /* allocate the inode. 1862 */ 1863 rc = diAllocBit(imap, iagp, ino); 1864 IREAD_UNLOCK(imap->im_ipimap); 1865 if (rc) { 1866 release_metapage(mp); 1867 return (rc); 1868 } 1869 1870 /* set the results of the allocation and write the iag. 1871 */ 1872 diInitInode(ip, iagno, ino, extno, iagp); 1873 write_metapage(mp); 1874 1875 return (0); 1876 } 1877 1878 1879 /* 1880 * NAME: diAllocExt(imap,agno,ip) 1881 * 1882 * FUNCTION: add a new extent of free inodes to an iag, allocating 1883 * an inode from this extent to satisfy the current allocation 1884 * request. 1885 * 1886 * this routine first tries to find an existing iag with free 1887 * extents through the ag free extent list. if list is not 1888 * empty, the head of the list will be selected as the home 1889 * of the new extent of free inodes. otherwise (the list is 1890 * empty), a new iag will be allocated for the ag to contain 1891 * the extent. 1892 * 1893 * once an iag has been selected, the free extent summary map 1894 * is used to locate a free extent within the iag and diNewExt() 1895 * is called to initialize the extent, with initialization 1896 * including the allocation of the first inode of the extent 1897 * for the purpose of satisfying this request. 1898 * 1899 * PARAMETERS: 1900 * imap - pointer to inode map control structure. 1901 * agno - allocation group number. 1902 * ip - pointer to new inode to be filled in on successful return 1903 * with the disk inode number allocated, its extent address 1904 * and the start of the ag. 1905 * 1906 * RETURN VALUES: 1907 * 0 - success. 1908 * -ENOSPC - insufficient disk resources. 1909 * -EIO - i/o error. 1910 */ 1911 static int diAllocExt(struct inomap * imap, int agno, struct inode *ip) 1912 { 1913 int rem, iagno, sword, extno, rc; 1914 struct metapage *mp; 1915 struct iag *iagp; 1916 1917 /* check if the ag has any iags with free extents. if not, 1918 * allocate a new iag for the ag. 1919 */ 1920 if ((iagno = imap->im_agctl[agno].extfree) < 0) { 1921 /* If successful, diNewIAG will obtain the read lock on the 1922 * imap inode. 1923 */ 1924 if ((rc = diNewIAG(imap, &iagno, agno, &mp))) { 1925 return (rc); 1926 } 1927 iagp = (struct iag *) mp->data; 1928 1929 /* set the ag number if this a brand new iag 1930 */ 1931 iagp->agstart = 1932 cpu_to_le64(AGTOBLK(agno, imap->im_ipimap)); 1933 } else { 1934 /* read the iag. 1935 */ 1936 IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP); 1937 if ((rc = diIAGRead(imap, iagno, &mp))) { 1938 IREAD_UNLOCK(imap->im_ipimap); 1939 jfs_error(ip->i_sb, "diAllocExt: error reading iag"); 1940 return rc; 1941 } 1942 iagp = (struct iag *) mp->data; 1943 } 1944 1945 /* using the free extent summary map, find a free extent. 1946 */ 1947 for (sword = 0;; sword++) { 1948 if (sword >= SMAPSZ) { 1949 release_metapage(mp); 1950 IREAD_UNLOCK(imap->im_ipimap); 1951 jfs_error(ip->i_sb, 1952 "diAllocExt: free ext summary map not found"); 1953 return -EIO; 1954 } 1955 if (~iagp->extsmap[sword]) 1956 break; 1957 } 1958 1959 /* determine the extent number of the free extent. 1960 */ 1961 rem = diFindFree(le32_to_cpu(iagp->extsmap[sword]), 0); 1962 if (rem >= EXTSPERSUM) { 1963 release_metapage(mp); 1964 IREAD_UNLOCK(imap->im_ipimap); 1965 jfs_error(ip->i_sb, "diAllocExt: free extent not found"); 1966 return -EIO; 1967 } 1968 extno = (sword << L2EXTSPERSUM) + rem; 1969 1970 /* initialize the new extent. 1971 */ 1972 rc = diNewExt(imap, iagp, extno); 1973 IREAD_UNLOCK(imap->im_ipimap); 1974 if (rc) { 1975 /* something bad happened. if a new iag was allocated, 1976 * place it back on the inode map's iag free list, and 1977 * clear the ag number information. 1978 */ 1979 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) { 1980 IAGFREE_LOCK(imap); 1981 iagp->iagfree = cpu_to_le32(imap->im_freeiag); 1982 imap->im_freeiag = iagno; 1983 IAGFREE_UNLOCK(imap); 1984 } 1985 write_metapage(mp); 1986 return (rc); 1987 } 1988 1989 /* set the results of the allocation and write the iag. 1990 */ 1991 diInitInode(ip, iagno, extno << L2INOSPEREXT, extno, iagp); 1992 1993 write_metapage(mp); 1994 1995 return (0); 1996 } 1997 1998 1999 /* 2000 * NAME: diAllocBit(imap,iagp,ino) 2001 * 2002 * FUNCTION: allocate a backed inode from an iag. 2003 * 2004 * this routine performs the mechanics of allocating a 2005 * specified inode from a backed extent. 2006 * 2007 * if the inode to be allocated represents the last free 2008 * inode within the iag, the iag will be removed from the 2009 * ag free inode list. 2010 * 2011 * a careful update approach is used to provide consistency 2012 * in the face of updates to multiple buffers. under this 2013 * approach, all required buffers are obtained before making 2014 * any updates and are held all are updates are complete. 2015 * 2016 * PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on 2017 * this AG. Must have read lock on imap inode. 2018 * 2019 * PARAMETERS: 2020 * imap - pointer to inode map control structure. 2021 * iagp - pointer to iag. 2022 * ino - inode number to be allocated within the iag. 2023 * 2024 * RETURN VALUES: 2025 * 0 - success. 2026 * -ENOSPC - insufficient disk resources. 2027 * -EIO - i/o error. 2028 */ 2029 static int diAllocBit(struct inomap * imap, struct iag * iagp, int ino) 2030 { 2031 int extno, bitno, agno, sword, rc; 2032 struct metapage *amp = NULL, *bmp = NULL; 2033 struct iag *aiagp = NULL, *biagp = NULL; 2034 u32 mask; 2035 2036 /* check if this is the last free inode within the iag. 2037 * if so, it will have to be removed from the ag free 2038 * inode list, so get the iags preceding and following 2039 * it on the list. 2040 */ 2041 if (iagp->nfreeinos == cpu_to_le32(1)) { 2042 if ((int) le32_to_cpu(iagp->inofreefwd) >= 0) { 2043 if ((rc = 2044 diIAGRead(imap, le32_to_cpu(iagp->inofreefwd), 2045 &))) 2046 return (rc); 2047 aiagp = (struct iag *) amp->data; 2048 } 2049 2050 if ((int) le32_to_cpu(iagp->inofreeback) >= 0) { 2051 if ((rc = 2052 diIAGRead(imap, 2053 le32_to_cpu(iagp->inofreeback), 2054 &bmp))) { 2055 if (amp) 2056 release_metapage(amp); 2057 return (rc); 2058 } 2059 biagp = (struct iag *) bmp->data; 2060 } 2061 } 2062 2063 /* get the ag number, extent number, inode number within 2064 * the extent. 2065 */ 2066 agno = BLKTOAG(le64_to_cpu(iagp->agstart), JFS_SBI(imap->im_ipimap->i_sb)); 2067 extno = ino >> L2INOSPEREXT; 2068 bitno = ino & (INOSPEREXT - 1); 2069 2070 /* compute the mask for setting the map. 2071 */ 2072 mask = HIGHORDER >> bitno; 2073 2074 /* the inode should be free and backed. 2075 */ 2076 if (((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) || 2077 ((le32_to_cpu(iagp->wmap[extno]) & mask) != 0) || 2078 (addressPXD(&iagp->inoext[extno]) == 0)) { 2079 if (amp) 2080 release_metapage(amp); 2081 if (bmp) 2082 release_metapage(bmp); 2083 2084 jfs_error(imap->im_ipimap->i_sb, 2085 "diAllocBit: iag inconsistent"); 2086 return -EIO; 2087 } 2088 2089 /* mark the inode as allocated in the working map. 2090 */ 2091 iagp->wmap[extno] |= cpu_to_le32(mask); 2092 2093 /* check if all inodes within the extent are now 2094 * allocated. if so, update the free inode summary 2095 * map to reflect this. 2096 */ 2097 if (iagp->wmap[extno] == cpu_to_le32(ONES)) { 2098 sword = extno >> L2EXTSPERSUM; 2099 bitno = extno & (EXTSPERSUM - 1); 2100 iagp->inosmap[sword] |= cpu_to_le32(HIGHORDER >> bitno); 2101 } 2102 2103 /* if this was the last free inode in the iag, remove the 2104 * iag from the ag free inode list. 2105 */ 2106 if (iagp->nfreeinos == cpu_to_le32(1)) { 2107 if (amp) { 2108 aiagp->inofreeback = iagp->inofreeback; 2109 write_metapage(amp); 2110 } 2111 2112 if (bmp) { 2113 biagp->inofreefwd = iagp->inofreefwd; 2114 write_metapage(bmp); 2115 } else { 2116 imap->im_agctl[agno].inofree = 2117 le32_to_cpu(iagp->inofreefwd); 2118 } 2119 iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1); 2120 } 2121 2122 /* update the free inode count at the iag, ag, inode 2123 * map levels. 2124 */ 2125 le32_add_cpu(&iagp->nfreeinos, -1); 2126 imap->im_agctl[agno].numfree -= 1; 2127 atomic_dec(&imap->im_numfree); 2128 2129 return (0); 2130 } 2131 2132 2133 /* 2134 * NAME: diNewExt(imap,iagp,extno) 2135 * 2136 * FUNCTION: initialize a new extent of inodes for an iag, allocating 2137 * the first inode of the extent for use for the current 2138 * allocation request. 2139 * 2140 * disk resources are allocated for the new extent of inodes 2141 * and the inodes themselves are initialized to reflect their 2142 * existence within the extent (i.e. their inode numbers and 2143 * inode extent addresses are set) and their initial state 2144 * (mode and link count are set to zero). 2145 * 2146 * if the iag is new, it is not yet on an ag extent free list 2147 * but will now be placed on this list. 2148 * 2149 * if the allocation of the new extent causes the iag to 2150 * have no free extent, the iag will be removed from the 2151 * ag extent free list. 2152 * 2153 * if the iag has no free backed inodes, it will be placed 2154 * on the ag free inode list, since the addition of the new 2155 * extent will now cause it to have free inodes. 2156 * 2157 * a careful update approach is used to provide consistency 2158 * (i.e. list consistency) in the face of updates to multiple 2159 * buffers. under this approach, all required buffers are 2160 * obtained before making any updates and are held until all 2161 * updates are complete. 2162 * 2163 * PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on 2164 * this AG. Must have read lock on imap inode. 2165 * 2166 * PARAMETERS: 2167 * imap - pointer to inode map control structure. 2168 * iagp - pointer to iag. 2169 * extno - extent number. 2170 * 2171 * RETURN VALUES: 2172 * 0 - success. 2173 * -ENOSPC - insufficient disk resources. 2174 * -EIO - i/o error. 2175 */ 2176 static int diNewExt(struct inomap * imap, struct iag * iagp, int extno) 2177 { 2178 int agno, iagno, fwd, back, freei = 0, sword, rc; 2179 struct iag *aiagp = NULL, *biagp = NULL, *ciagp = NULL; 2180 struct metapage *amp, *bmp, *cmp, *dmp; 2181 struct inode *ipimap; 2182 s64 blkno, hint; 2183 int i, j; 2184 u32 mask; 2185 ino_t ino; 2186 struct dinode *dp; 2187 struct jfs_sb_info *sbi; 2188 2189 /* better have free extents. 2190 */ 2191 if (!iagp->nfreeexts) { 2192 jfs_error(imap->im_ipimap->i_sb, "diNewExt: no free extents"); 2193 return -EIO; 2194 } 2195 2196 /* get the inode map inode. 2197 */ 2198 ipimap = imap->im_ipimap; 2199 sbi = JFS_SBI(ipimap->i_sb); 2200 2201 amp = bmp = cmp = NULL; 2202 2203 /* get the ag and iag numbers for this iag. 2204 */ 2205 agno = BLKTOAG(le64_to_cpu(iagp->agstart), sbi); 2206 iagno = le32_to_cpu(iagp->iagnum); 2207 2208 /* check if this is the last free extent within the 2209 * iag. if so, the iag must be removed from the ag 2210 * free extent list, so get the iags preceding and 2211 * following the iag on this list. 2212 */ 2213 if (iagp->nfreeexts == cpu_to_le32(1)) { 2214 if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) { 2215 if ((rc = diIAGRead(imap, fwd, &))) 2216 return (rc); 2217 aiagp = (struct iag *) amp->data; 2218 } 2219 2220 if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) { 2221 if ((rc = diIAGRead(imap, back, &bmp))) 2222 goto error_out; 2223 biagp = (struct iag *) bmp->data; 2224 } 2225 } else { 2226 /* the iag has free extents. if all extents are free 2227 * (as is the case for a newly allocated iag), the iag 2228 * must be added to the ag free extent list, so get 2229 * the iag at the head of the list in preparation for 2230 * adding this iag to this list. 2231 */ 2232 fwd = back = -1; 2233 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) { 2234 if ((fwd = imap->im_agctl[agno].extfree) >= 0) { 2235 if ((rc = diIAGRead(imap, fwd, &))) 2236 goto error_out; 2237 aiagp = (struct iag *) amp->data; 2238 } 2239 } 2240 } 2241 2242 /* check if the iag has no free inodes. if so, the iag 2243 * will have to be added to the ag free inode list, so get 2244 * the iag at the head of the list in preparation for 2245 * adding this iag to this list. in doing this, we must 2246 * check if we already have the iag at the head of 2247 * the list in hand. 2248 */ 2249 if (iagp->nfreeinos == 0) { 2250 freei = imap->im_agctl[agno].inofree; 2251 2252 if (freei >= 0) { 2253 if (freei == fwd) { 2254 ciagp = aiagp; 2255 } else if (freei == back) { 2256 ciagp = biagp; 2257 } else { 2258 if ((rc = diIAGRead(imap, freei, &cmp))) 2259 goto error_out; 2260 ciagp = (struct iag *) cmp->data; 2261 } 2262 if (ciagp == NULL) { 2263 jfs_error(imap->im_ipimap->i_sb, 2264 "diNewExt: ciagp == NULL"); 2265 rc = -EIO; 2266 goto error_out; 2267 } 2268 } 2269 } 2270 2271 /* allocate disk space for the inode extent. 2272 */ 2273 if ((extno == 0) || (addressPXD(&iagp->inoext[extno - 1]) == 0)) 2274 hint = ((s64) agno << sbi->bmap->db_agl2size) - 1; 2275 else 2276 hint = addressPXD(&iagp->inoext[extno - 1]) + 2277 lengthPXD(&iagp->inoext[extno - 1]) - 1; 2278 2279 if ((rc = dbAlloc(ipimap, hint, (s64) imap->im_nbperiext, &blkno))) 2280 goto error_out; 2281 2282 /* compute the inode number of the first inode within the 2283 * extent. 2284 */ 2285 ino = (iagno << L2INOSPERIAG) + (extno << L2INOSPEREXT); 2286 2287 /* initialize the inodes within the newly allocated extent a 2288 * page at a time. 2289 */ 2290 for (i = 0; i < imap->im_nbperiext; i += sbi->nbperpage) { 2291 /* get a buffer for this page of disk inodes. 2292 */ 2293 dmp = get_metapage(ipimap, blkno + i, PSIZE, 1); 2294 if (dmp == NULL) { 2295 rc = -EIO; 2296 goto error_out; 2297 } 2298 dp = (struct dinode *) dmp->data; 2299 2300 /* initialize the inode number, mode, link count and 2301 * inode extent address. 2302 */ 2303 for (j = 0; j < INOSPERPAGE; j++, dp++, ino++) { 2304 dp->di_inostamp = cpu_to_le32(sbi->inostamp); 2305 dp->di_number = cpu_to_le32(ino); 2306 dp->di_fileset = cpu_to_le32(FILESYSTEM_I); 2307 dp->di_mode = 0; 2308 dp->di_nlink = 0; 2309 PXDaddress(&(dp->di_ixpxd), blkno); 2310 PXDlength(&(dp->di_ixpxd), imap->im_nbperiext); 2311 } 2312 write_metapage(dmp); 2313 } 2314 2315 /* if this is the last free extent within the iag, remove the 2316 * iag from the ag free extent list. 2317 */ 2318 if (iagp->nfreeexts == cpu_to_le32(1)) { 2319 if (fwd >= 0) 2320 aiagp->extfreeback = iagp->extfreeback; 2321 2322 if (back >= 0) 2323 biagp->extfreefwd = iagp->extfreefwd; 2324 else 2325 imap->im_agctl[agno].extfree = 2326 le32_to_cpu(iagp->extfreefwd); 2327 2328 iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1); 2329 } else { 2330 /* if the iag has all free extents (newly allocated iag), 2331 * add the iag to the ag free extent list. 2332 */ 2333 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) { 2334 if (fwd >= 0) 2335 aiagp->extfreeback = cpu_to_le32(iagno); 2336 2337 iagp->extfreefwd = cpu_to_le32(fwd); 2338 iagp->extfreeback = cpu_to_le32(-1); 2339 imap->im_agctl[agno].extfree = iagno; 2340 } 2341 } 2342 2343 /* if the iag has no free inodes, add the iag to the 2344 * ag free inode list. 2345 */ 2346 if (iagp->nfreeinos == 0) { 2347 if (freei >= 0) 2348 ciagp->inofreeback = cpu_to_le32(iagno); 2349 2350 iagp->inofreefwd = 2351 cpu_to_le32(imap->im_agctl[agno].inofree); 2352 iagp->inofreeback = cpu_to_le32(-1); 2353 imap->im_agctl[agno].inofree = iagno; 2354 } 2355 2356 /* initialize the extent descriptor of the extent. */ 2357 PXDlength(&iagp->inoext[extno], imap->im_nbperiext); 2358 PXDaddress(&iagp->inoext[extno], blkno); 2359 2360 /* initialize the working and persistent map of the extent. 2361 * the working map will be initialized such that 2362 * it indicates the first inode of the extent is allocated. 2363 */ 2364 iagp->wmap[extno] = cpu_to_le32(HIGHORDER); 2365 iagp->pmap[extno] = 0; 2366 2367 /* update the free inode and free extent summary maps 2368 * for the extent to indicate the extent has free inodes 2369 * and no longer represents a free extent. 2370 */ 2371 sword = extno >> L2EXTSPERSUM; 2372 mask = HIGHORDER >> (extno & (EXTSPERSUM - 1)); 2373 iagp->extsmap[sword] |= cpu_to_le32(mask); 2374 iagp->inosmap[sword] &= cpu_to_le32(~mask); 2375 2376 /* update the free inode and free extent counts for the 2377 * iag. 2378 */ 2379 le32_add_cpu(&iagp->nfreeinos, (INOSPEREXT - 1)); 2380 le32_add_cpu(&iagp->nfreeexts, -1); 2381 2382 /* update the free and backed inode counts for the ag. 2383 */ 2384 imap->im_agctl[agno].numfree += (INOSPEREXT - 1); 2385 imap->im_agctl[agno].numinos += INOSPEREXT; 2386 2387 /* update the free and backed inode counts for the inode map. 2388 */ 2389 atomic_add(INOSPEREXT - 1, &imap->im_numfree); 2390 atomic_add(INOSPEREXT, &imap->im_numinos); 2391 2392 /* write the iags. 2393 */ 2394 if (amp) 2395 write_metapage(amp); 2396 if (bmp) 2397 write_metapage(bmp); 2398 if (cmp) 2399 write_metapage(cmp); 2400 2401 return (0); 2402 2403 error_out: 2404 2405 /* release the iags. 2406 */ 2407 if (amp) 2408 release_metapage(amp); 2409 if (bmp) 2410 release_metapage(bmp); 2411 if (cmp) 2412 release_metapage(cmp); 2413 2414 return (rc); 2415 } 2416 2417 2418 /* 2419 * NAME: diNewIAG(imap,iagnop,agno) 2420 * 2421 * FUNCTION: allocate a new iag for an allocation group. 2422 * 2423 * first tries to allocate the iag from the inode map 2424 * iagfree list: 2425 * if the list has free iags, the head of the list is removed 2426 * and returned to satisfy the request. 2427 * if the inode map's iag free list is empty, the inode map 2428 * is extended to hold a new iag. this new iag is initialized 2429 * and returned to satisfy the request. 2430 * 2431 * PARAMETERS: 2432 * imap - pointer to inode map control structure. 2433 * iagnop - pointer to an iag number set with the number of the 2434 * newly allocated iag upon successful return. 2435 * agno - allocation group number. 2436 * bpp - Buffer pointer to be filled in with new IAG's buffer 2437 * 2438 * RETURN VALUES: 2439 * 0 - success. 2440 * -ENOSPC - insufficient disk resources. 2441 * -EIO - i/o error. 2442 * 2443 * serialization: 2444 * AG lock held on entry/exit; 2445 * write lock on the map is held inside; 2446 * read lock on the map is held on successful completion; 2447 * 2448 * note: new iag transaction: 2449 * . synchronously write iag; 2450 * . write log of xtree and inode of imap; 2451 * . commit; 2452 * . synchronous write of xtree (right to left, bottom to top); 2453 * . at start of logredo(): init in-memory imap with one additional iag page; 2454 * . at end of logredo(): re-read imap inode to determine 2455 * new imap size; 2456 */ 2457 static int 2458 diNewIAG(struct inomap * imap, int *iagnop, int agno, struct metapage ** mpp) 2459 { 2460 int rc; 2461 int iagno, i, xlen; 2462 struct inode *ipimap; 2463 struct super_block *sb; 2464 struct jfs_sb_info *sbi; 2465 struct metapage *mp; 2466 struct iag *iagp; 2467 s64 xaddr = 0; 2468 s64 blkno; 2469 tid_t tid; 2470 struct inode *iplist[1]; 2471 2472 /* pick up pointers to the inode map and mount inodes */ 2473 ipimap = imap->im_ipimap; 2474 sb = ipimap->i_sb; 2475 sbi = JFS_SBI(sb); 2476 2477 /* acquire the free iag lock */ 2478 IAGFREE_LOCK(imap); 2479 2480 /* if there are any iags on the inode map free iag list, 2481 * allocate the iag from the head of the list. 2482 */ 2483 if (imap->im_freeiag >= 0) { 2484 /* pick up the iag number at the head of the list */ 2485 iagno = imap->im_freeiag; 2486 2487 /* determine the logical block number of the iag */ 2488 blkno = IAGTOLBLK(iagno, sbi->l2nbperpage); 2489 } else { 2490 /* no free iags. the inode map will have to be extented 2491 * to include a new iag. 2492 */ 2493 2494 /* acquire inode map lock */ 2495 IWRITE_LOCK(ipimap, RDWRLOCK_IMAP); 2496 2497 if (ipimap->i_size >> L2PSIZE != imap->im_nextiag + 1) { 2498 IWRITE_UNLOCK(ipimap); 2499 IAGFREE_UNLOCK(imap); 2500 jfs_error(imap->im_ipimap->i_sb, 2501 "diNewIAG: ipimap->i_size is wrong"); 2502 return -EIO; 2503 } 2504 2505 2506 /* get the next available iag number */ 2507 iagno = imap->im_nextiag; 2508 2509 /* make sure that we have not exceeded the maximum inode 2510 * number limit. 2511 */ 2512 if (iagno > (MAXIAGS - 1)) { 2513 /* release the inode map lock */ 2514 IWRITE_UNLOCK(ipimap); 2515 2516 rc = -ENOSPC; 2517 goto out; 2518 } 2519 2520 /* 2521 * synchronously append new iag page. 2522 */ 2523 /* determine the logical address of iag page to append */ 2524 blkno = IAGTOLBLK(iagno, sbi->l2nbperpage); 2525 2526 /* Allocate extent for new iag page */ 2527 xlen = sbi->nbperpage; 2528 if ((rc = dbAlloc(ipimap, 0, (s64) xlen, &xaddr))) { 2529 /* release the inode map lock */ 2530 IWRITE_UNLOCK(ipimap); 2531 2532 goto out; 2533 } 2534 2535 /* 2536 * start transaction of update of the inode map 2537 * addressing structure pointing to the new iag page; 2538 */ 2539 tid = txBegin(sb, COMMIT_FORCE); 2540 mutex_lock(&JFS_IP(ipimap)->commit_mutex); 2541 2542 /* update the inode map addressing structure to point to it */ 2543 if ((rc = 2544 xtInsert(tid, ipimap, 0, blkno, xlen, &xaddr, 0))) { 2545 txEnd(tid); 2546 mutex_unlock(&JFS_IP(ipimap)->commit_mutex); 2547 /* Free the blocks allocated for the iag since it was 2548 * not successfully added to the inode map 2549 */ 2550 dbFree(ipimap, xaddr, (s64) xlen); 2551 2552 /* release the inode map lock */ 2553 IWRITE_UNLOCK(ipimap); 2554 2555 goto out; 2556 } 2557 2558 /* update the inode map's inode to reflect the extension */ 2559 ipimap->i_size += PSIZE; 2560 inode_add_bytes(ipimap, PSIZE); 2561 2562 /* assign a buffer for the page */ 2563 mp = get_metapage(ipimap, blkno, PSIZE, 0); 2564 if (!mp) { 2565 /* 2566 * This is very unlikely since we just created the 2567 * extent, but let's try to handle it correctly 2568 */ 2569 xtTruncate(tid, ipimap, ipimap->i_size - PSIZE, 2570 COMMIT_PWMAP); 2571 2572 txAbort(tid, 0); 2573 txEnd(tid); 2574 mutex_unlock(&JFS_IP(ipimap)->commit_mutex); 2575 2576 /* release the inode map lock */ 2577 IWRITE_UNLOCK(ipimap); 2578 2579 rc = -EIO; 2580 goto out; 2581 } 2582 iagp = (struct iag *) mp->data; 2583 2584 /* init the iag */ 2585 memset(iagp, 0, sizeof(struct iag)); 2586 iagp->iagnum = cpu_to_le32(iagno); 2587 iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1); 2588 iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1); 2589 iagp->iagfree = cpu_to_le32(-1); 2590 iagp->nfreeinos = 0; 2591 iagp->nfreeexts = cpu_to_le32(EXTSPERIAG); 2592 2593 /* initialize the free inode summary map (free extent 2594 * summary map initialization handled by bzero). 2595 */ 2596 for (i = 0; i < SMAPSZ; i++) 2597 iagp->inosmap[i] = cpu_to_le32(ONES); 2598 2599 /* 2600 * Write and sync the metapage 2601 */ 2602 flush_metapage(mp); 2603 2604 /* 2605 * txCommit(COMMIT_FORCE) will synchronously write address 2606 * index pages and inode after commit in careful update order 2607 * of address index pages (right to left, bottom up); 2608 */ 2609 iplist[0] = ipimap; 2610 rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE); 2611 2612 txEnd(tid); 2613 mutex_unlock(&JFS_IP(ipimap)->commit_mutex); 2614 2615 duplicateIXtree(sb, blkno, xlen, &xaddr); 2616 2617 /* update the next available iag number */ 2618 imap->im_nextiag += 1; 2619 2620 /* Add the iag to the iag free list so we don't lose the iag 2621 * if a failure happens now. 2622 */ 2623 imap->im_freeiag = iagno; 2624 2625 /* Until we have logredo working, we want the imap inode & 2626 * control page to be up to date. 2627 */ 2628 diSync(ipimap); 2629 2630 /* release the inode map lock */ 2631 IWRITE_UNLOCK(ipimap); 2632 } 2633 2634 /* obtain read lock on map */ 2635 IREAD_LOCK(ipimap, RDWRLOCK_IMAP); 2636 2637 /* read the iag */ 2638 if ((rc = diIAGRead(imap, iagno, &mp))) { 2639 IREAD_UNLOCK(ipimap); 2640 rc = -EIO; 2641 goto out; 2642 } 2643 iagp = (struct iag *) mp->data; 2644 2645 /* remove the iag from the iag free list */ 2646 imap->im_freeiag = le32_to_cpu(iagp->iagfree); 2647 iagp->iagfree = cpu_to_le32(-1); 2648 2649 /* set the return iag number and buffer pointer */ 2650 *iagnop = iagno; 2651 *mpp = mp; 2652 2653 out: 2654 /* release the iag free lock */ 2655 IAGFREE_UNLOCK(imap); 2656 2657 return (rc); 2658 } 2659 2660 /* 2661 * NAME: diIAGRead() 2662 * 2663 * FUNCTION: get the buffer for the specified iag within a fileset 2664 * or aggregate inode map. 2665 * 2666 * PARAMETERS: 2667 * imap - pointer to inode map control structure. 2668 * iagno - iag number. 2669 * bpp - point to buffer pointer to be filled in on successful 2670 * exit. 2671 * 2672 * SERIALIZATION: 2673 * must have read lock on imap inode 2674 * (When called by diExtendFS, the filesystem is quiesced, therefore 2675 * the read lock is unnecessary.) 2676 * 2677 * RETURN VALUES: 2678 * 0 - success. 2679 * -EIO - i/o error. 2680 */ 2681 static int diIAGRead(struct inomap * imap, int iagno, struct metapage ** mpp) 2682 { 2683 struct inode *ipimap = imap->im_ipimap; 2684 s64 blkno; 2685 2686 /* compute the logical block number of the iag. */ 2687 blkno = IAGTOLBLK(iagno, JFS_SBI(ipimap->i_sb)->l2nbperpage); 2688 2689 /* read the iag. */ 2690 *mpp = read_metapage(ipimap, blkno, PSIZE, 0); 2691 if (*mpp == NULL) { 2692 return -EIO; 2693 } 2694 2695 return (0); 2696 } 2697 2698 /* 2699 * NAME: diFindFree() 2700 * 2701 * FUNCTION: find the first free bit in a word starting at 2702 * the specified bit position. 2703 * 2704 * PARAMETERS: 2705 * word - word to be examined. 2706 * start - starting bit position. 2707 * 2708 * RETURN VALUES: 2709 * bit position of first free bit in the word or 32 if 2710 * no free bits were found. 2711 */ 2712 static int diFindFree(u32 word, int start) 2713 { 2714 int bitno; 2715 assert(start < 32); 2716 /* scan the word for the first free bit. */ 2717 for (word <<= start, bitno = start; bitno < 32; 2718 bitno++, word <<= 1) { 2719 if ((word & HIGHORDER) == 0) 2720 break; 2721 } 2722 return (bitno); 2723 } 2724 2725 /* 2726 * NAME: diUpdatePMap() 2727 * 2728 * FUNCTION: Update the persistent map in an IAG for the allocation or 2729 * freeing of the specified inode. 2730 * 2731 * PRE CONDITIONS: Working map has already been updated for allocate. 2732 * 2733 * PARAMETERS: 2734 * ipimap - Incore inode map inode 2735 * inum - Number of inode to mark in permanent map 2736 * is_free - If 'true' indicates inode should be marked freed, otherwise 2737 * indicates inode should be marked allocated. 2738 * 2739 * RETURN VALUES: 2740 * 0 for success 2741 */ 2742 int 2743 diUpdatePMap(struct inode *ipimap, 2744 unsigned long inum, bool is_free, struct tblock * tblk) 2745 { 2746 int rc; 2747 struct iag *iagp; 2748 struct metapage *mp; 2749 int iagno, ino, extno, bitno; 2750 struct inomap *imap; 2751 u32 mask; 2752 struct jfs_log *log; 2753 int lsn, difft, diffp; 2754 unsigned long flags; 2755 2756 imap = JFS_IP(ipimap)->i_imap; 2757 /* get the iag number containing the inode */ 2758 iagno = INOTOIAG(inum); 2759 /* make sure that the iag is contained within the map */ 2760 if (iagno >= imap->im_nextiag) { 2761 jfs_error(ipimap->i_sb, 2762 "diUpdatePMap: the iag is outside the map"); 2763 return -EIO; 2764 } 2765 /* read the iag */ 2766 IREAD_LOCK(ipimap, RDWRLOCK_IMAP); 2767 rc = diIAGRead(imap, iagno, &mp); 2768 IREAD_UNLOCK(ipimap); 2769 if (rc) 2770 return (rc); 2771 metapage_wait_for_io(mp); 2772 iagp = (struct iag *) mp->data; 2773 /* get the inode number and extent number of the inode within 2774 * the iag and the inode number within the extent. 2775 */ 2776 ino = inum & (INOSPERIAG - 1); 2777 extno = ino >> L2INOSPEREXT; 2778 bitno = ino & (INOSPEREXT - 1); 2779 mask = HIGHORDER >> bitno; 2780 /* 2781 * mark the inode free in persistent map: 2782 */ 2783 if (is_free) { 2784 /* The inode should have been allocated both in working 2785 * map and in persistent map; 2786 * the inode will be freed from working map at the release 2787 * of last reference release; 2788 */ 2789 if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) { 2790 jfs_error(ipimap->i_sb, 2791 "diUpdatePMap: inode %ld not marked as " 2792 "allocated in wmap!", inum); 2793 } 2794 if (!(le32_to_cpu(iagp->pmap[extno]) & mask)) { 2795 jfs_error(ipimap->i_sb, 2796 "diUpdatePMap: inode %ld not marked as " 2797 "allocated in pmap!", inum); 2798 } 2799 /* update the bitmap for the extent of the freed inode */ 2800 iagp->pmap[extno] &= cpu_to_le32(~mask); 2801 } 2802 /* 2803 * mark the inode allocated in persistent map: 2804 */ 2805 else { 2806 /* The inode should be already allocated in the working map 2807 * and should be free in persistent map; 2808 */ 2809 if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) { 2810 release_metapage(mp); 2811 jfs_error(ipimap->i_sb, 2812 "diUpdatePMap: the inode is not allocated in " 2813 "the working map"); 2814 return -EIO; 2815 } 2816 if ((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) { 2817 release_metapage(mp); 2818 jfs_error(ipimap->i_sb, 2819 "diUpdatePMap: the inode is not free in the " 2820 "persistent map"); 2821 return -EIO; 2822 } 2823 /* update the bitmap for the extent of the allocated inode */ 2824 iagp->pmap[extno] |= cpu_to_le32(mask); 2825 } 2826 /* 2827 * update iag lsn 2828 */ 2829 lsn = tblk->lsn; 2830 log = JFS_SBI(tblk->sb)->log; 2831 LOGSYNC_LOCK(log, flags); 2832 if (mp->lsn != 0) { 2833 /* inherit older/smaller lsn */ 2834 logdiff(difft, lsn, log); 2835 logdiff(diffp, mp->lsn, log); 2836 if (difft < diffp) { 2837 mp->lsn = lsn; 2838 /* move mp after tblock in logsync list */ 2839 list_move(&mp->synclist, &tblk->synclist); 2840 } 2841 /* inherit younger/larger clsn */ 2842 assert(mp->clsn); 2843 logdiff(difft, tblk->clsn, log); 2844 logdiff(diffp, mp->clsn, log); 2845 if (difft > diffp) 2846 mp->clsn = tblk->clsn; 2847 } else { 2848 mp->log = log; 2849 mp->lsn = lsn; 2850 /* insert mp after tblock in logsync list */ 2851 log->count++; 2852 list_add(&mp->synclist, &tblk->synclist); 2853 mp->clsn = tblk->clsn; 2854 } 2855 LOGSYNC_UNLOCK(log, flags); 2856 write_metapage(mp); 2857 return (0); 2858 } 2859 2860 /* 2861 * diExtendFS() 2862 * 2863 * function: update imap for extendfs(); 2864 * 2865 * note: AG size has been increased s.t. each k old contiguous AGs are 2866 * coalesced into a new AG; 2867 */ 2868 int diExtendFS(struct inode *ipimap, struct inode *ipbmap) 2869 { 2870 int rc, rcx = 0; 2871 struct inomap *imap = JFS_IP(ipimap)->i_imap; 2872 struct iag *iagp = NULL, *hiagp = NULL; 2873 struct bmap *mp = JFS_SBI(ipbmap->i_sb)->bmap; 2874 struct metapage *bp, *hbp; 2875 int i, n, head; 2876 int numinos, xnuminos = 0, xnumfree = 0; 2877 s64 agstart; 2878 2879 jfs_info("diExtendFS: nextiag:%d numinos:%d numfree:%d", 2880 imap->im_nextiag, atomic_read(&imap->im_numinos), 2881 atomic_read(&imap->im_numfree)); 2882 2883 /* 2884 * reconstruct imap 2885 * 2886 * coalesce contiguous k (newAGSize/oldAGSize) AGs; 2887 * i.e., (AGi, ..., AGj) where i = k*n and j = k*(n+1) - 1 to AGn; 2888 * note: new AG size = old AG size * (2**x). 2889 */ 2890 2891 /* init per AG control information im_agctl[] */ 2892 for (i = 0; i < MAXAG; i++) { 2893 imap->im_agctl[i].inofree = -1; 2894 imap->im_agctl[i].extfree = -1; 2895 imap->im_agctl[i].numinos = 0; /* number of backed inodes */ 2896 imap->im_agctl[i].numfree = 0; /* number of free backed inodes */ 2897 } 2898 2899 /* 2900 * process each iag page of the map. 2901 * 2902 * rebuild AG Free Inode List, AG Free Inode Extent List; 2903 */ 2904 for (i = 0; i < imap->im_nextiag; i++) { 2905 if ((rc = diIAGRead(imap, i, &bp))) { 2906 rcx = rc; 2907 continue; 2908 } 2909 iagp = (struct iag *) bp->data; 2910 if (le32_to_cpu(iagp->iagnum) != i) { 2911 release_metapage(bp); 2912 jfs_error(ipimap->i_sb, 2913 "diExtendFs: unexpected value of iagnum"); 2914 return -EIO; 2915 } 2916 2917 /* leave free iag in the free iag list */ 2918 if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) { 2919 release_metapage(bp); 2920 continue; 2921 } 2922 2923 agstart = le64_to_cpu(iagp->agstart); 2924 n = agstart >> mp->db_agl2size; 2925 iagp->agstart = cpu_to_le64((s64)n << mp->db_agl2size); 2926 2927 /* compute backed inodes */ 2928 numinos = (EXTSPERIAG - le32_to_cpu(iagp->nfreeexts)) 2929 << L2INOSPEREXT; 2930 if (numinos > 0) { 2931 /* merge AG backed inodes */ 2932 imap->im_agctl[n].numinos += numinos; 2933 xnuminos += numinos; 2934 } 2935 2936 /* if any backed free inodes, insert at AG free inode list */ 2937 if ((int) le32_to_cpu(iagp->nfreeinos) > 0) { 2938 if ((head = imap->im_agctl[n].inofree) == -1) { 2939 iagp->inofreefwd = cpu_to_le32(-1); 2940 iagp->inofreeback = cpu_to_le32(-1); 2941 } else { 2942 if ((rc = diIAGRead(imap, head, &hbp))) { 2943 rcx = rc; 2944 goto nextiag; 2945 } 2946 hiagp = (struct iag *) hbp->data; 2947 hiagp->inofreeback = iagp->iagnum; 2948 iagp->inofreefwd = cpu_to_le32(head); 2949 iagp->inofreeback = cpu_to_le32(-1); 2950 write_metapage(hbp); 2951 } 2952 2953 imap->im_agctl[n].inofree = 2954 le32_to_cpu(iagp->iagnum); 2955 2956 /* merge AG backed free inodes */ 2957 imap->im_agctl[n].numfree += 2958 le32_to_cpu(iagp->nfreeinos); 2959 xnumfree += le32_to_cpu(iagp->nfreeinos); 2960 } 2961 2962 /* if any free extents, insert at AG free extent list */ 2963 if (le32_to_cpu(iagp->nfreeexts) > 0) { 2964 if ((head = imap->im_agctl[n].extfree) == -1) { 2965 iagp->extfreefwd = cpu_to_le32(-1); 2966 iagp->extfreeback = cpu_to_le32(-1); 2967 } else { 2968 if ((rc = diIAGRead(imap, head, &hbp))) { 2969 rcx = rc; 2970 goto nextiag; 2971 } 2972 hiagp = (struct iag *) hbp->data; 2973 hiagp->extfreeback = iagp->iagnum; 2974 iagp->extfreefwd = cpu_to_le32(head); 2975 iagp->extfreeback = cpu_to_le32(-1); 2976 write_metapage(hbp); 2977 } 2978 2979 imap->im_agctl[n].extfree = 2980 le32_to_cpu(iagp->iagnum); 2981 } 2982 2983 nextiag: 2984 write_metapage(bp); 2985 } 2986 2987 if (xnuminos != atomic_read(&imap->im_numinos) || 2988 xnumfree != atomic_read(&imap->im_numfree)) { 2989 jfs_error(ipimap->i_sb, 2990 "diExtendFs: numinos or numfree incorrect"); 2991 return -EIO; 2992 } 2993 2994 return rcx; 2995 } 2996 2997 2998 /* 2999 * duplicateIXtree() 3000 * 3001 * serialization: IWRITE_LOCK held on entry/exit 3002 * 3003 * note: shadow page with regular inode (rel.2); 3004 */ 3005 static void duplicateIXtree(struct super_block *sb, s64 blkno, 3006 int xlen, s64 *xaddr) 3007 { 3008 struct jfs_superblock *j_sb; 3009 struct buffer_head *bh; 3010 struct inode *ip; 3011 tid_t tid; 3012 3013 /* if AIT2 ipmap2 is bad, do not try to update it */ 3014 if (JFS_SBI(sb)->mntflag & JFS_BAD_SAIT) /* s_flag */ 3015 return; 3016 ip = diReadSpecial(sb, FILESYSTEM_I, 1); 3017 if (ip == NULL) { 3018 JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT; 3019 if (readSuper(sb, &bh)) 3020 return; 3021 j_sb = (struct jfs_superblock *)bh->b_data; 3022 j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT); 3023 3024 mark_buffer_dirty(bh); 3025 sync_dirty_buffer(bh); 3026 brelse(bh); 3027 return; 3028 } 3029 3030 /* start transaction */ 3031 tid = txBegin(sb, COMMIT_FORCE); 3032 /* update the inode map addressing structure to point to it */ 3033 if (xtInsert(tid, ip, 0, blkno, xlen, xaddr, 0)) { 3034 JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT; 3035 txAbort(tid, 1); 3036 goto cleanup; 3037 3038 } 3039 /* update the inode map's inode to reflect the extension */ 3040 ip->i_size += PSIZE; 3041 inode_add_bytes(ip, PSIZE); 3042 txCommit(tid, 1, &ip, COMMIT_FORCE); 3043 cleanup: 3044 txEnd(tid); 3045 diFreeSpecial(ip); 3046 } 3047 3048 /* 3049 * NAME: copy_from_dinode() 3050 * 3051 * FUNCTION: Copies inode info from disk inode to in-memory inode 3052 * 3053 * RETURN VALUES: 3054 * 0 - success 3055 * -ENOMEM - insufficient memory 3056 */ 3057 static int copy_from_dinode(struct dinode * dip, struct inode *ip) 3058 { 3059 struct jfs_inode_info *jfs_ip = JFS_IP(ip); 3060 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); 3061 3062 jfs_ip->fileset = le32_to_cpu(dip->di_fileset); 3063 jfs_ip->mode2 = le32_to_cpu(dip->di_mode); 3064 jfs_set_inode_flags(ip); 3065 3066 ip->i_mode = le32_to_cpu(dip->di_mode) & 0xffff; 3067 if (sbi->umask != -1) { 3068 ip->i_mode = (ip->i_mode & ~0777) | (0777 & ~sbi->umask); 3069 /* For directories, add x permission if r is allowed by umask */ 3070 if (S_ISDIR(ip->i_mode)) { 3071 if (ip->i_mode & 0400) 3072 ip->i_mode |= 0100; 3073 if (ip->i_mode & 0040) 3074 ip->i_mode |= 0010; 3075 if (ip->i_mode & 0004) 3076 ip->i_mode |= 0001; 3077 } 3078 } 3079 set_nlink(ip, le32_to_cpu(dip->di_nlink)); 3080 3081 jfs_ip->saved_uid = make_kuid(&init_user_ns, le32_to_cpu(dip->di_uid)); 3082 if (!uid_valid(sbi->uid)) 3083 ip->i_uid = jfs_ip->saved_uid; 3084 else { 3085 ip->i_uid = sbi->uid; 3086 } 3087 3088 jfs_ip->saved_gid = make_kgid(&init_user_ns, le32_to_cpu(dip->di_gid)); 3089 if (!gid_valid(sbi->gid)) 3090 ip->i_gid = jfs_ip->saved_gid; 3091 else { 3092 ip->i_gid = sbi->gid; 3093 } 3094 3095 ip->i_size = le64_to_cpu(dip->di_size); 3096 ip->i_atime.tv_sec = le32_to_cpu(dip->di_atime.tv_sec); 3097 ip->i_atime.tv_nsec = le32_to_cpu(dip->di_atime.tv_nsec); 3098 ip->i_mtime.tv_sec = le32_to_cpu(dip->di_mtime.tv_sec); 3099 ip->i_mtime.tv_nsec = le32_to_cpu(dip->di_mtime.tv_nsec); 3100 ip->i_ctime.tv_sec = le32_to_cpu(dip->di_ctime.tv_sec); 3101 ip->i_ctime.tv_nsec = le32_to_cpu(dip->di_ctime.tv_nsec); 3102 ip->i_blocks = LBLK2PBLK(ip->i_sb, le64_to_cpu(dip->di_nblocks)); 3103 ip->i_generation = le32_to_cpu(dip->di_gen); 3104 3105 jfs_ip->ixpxd = dip->di_ixpxd; /* in-memory pxd's are little-endian */ 3106 jfs_ip->acl = dip->di_acl; /* as are dxd's */ 3107 jfs_ip->ea = dip->di_ea; 3108 jfs_ip->next_index = le32_to_cpu(dip->di_next_index); 3109 jfs_ip->otime = le32_to_cpu(dip->di_otime.tv_sec); 3110 jfs_ip->acltype = le32_to_cpu(dip->di_acltype); 3111 3112 if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) { 3113 jfs_ip->dev = le32_to_cpu(dip->di_rdev); 3114 ip->i_rdev = new_decode_dev(jfs_ip->dev); 3115 } 3116 3117 if (S_ISDIR(ip->i_mode)) { 3118 memcpy(&jfs_ip->i_dirtable, &dip->di_dirtable, 384); 3119 } else if (S_ISREG(ip->i_mode) || S_ISLNK(ip->i_mode)) { 3120 memcpy(&jfs_ip->i_xtroot, &dip->di_xtroot, 288); 3121 } else 3122 memcpy(&jfs_ip->i_inline_ea, &dip->di_inlineea, 128); 3123 3124 /* Zero the in-memory-only stuff */ 3125 jfs_ip->cflag = 0; 3126 jfs_ip->btindex = 0; 3127 jfs_ip->btorder = 0; 3128 jfs_ip->bxflag = 0; 3129 jfs_ip->blid = 0; 3130 jfs_ip->atlhead = 0; 3131 jfs_ip->atltail = 0; 3132 jfs_ip->xtlid = 0; 3133 return (0); 3134 } 3135 3136 /* 3137 * NAME: copy_to_dinode() 3138 * 3139 * FUNCTION: Copies inode info from in-memory inode to disk inode 3140 */ 3141 static void copy_to_dinode(struct dinode * dip, struct inode *ip) 3142 { 3143 struct jfs_inode_info *jfs_ip = JFS_IP(ip); 3144 struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); 3145 3146 dip->di_fileset = cpu_to_le32(jfs_ip->fileset); 3147 dip->di_inostamp = cpu_to_le32(sbi->inostamp); 3148 dip->di_number = cpu_to_le32(ip->i_ino); 3149 dip->di_gen = cpu_to_le32(ip->i_generation); 3150 dip->di_size = cpu_to_le64(ip->i_size); 3151 dip->di_nblocks = cpu_to_le64(PBLK2LBLK(ip->i_sb, ip->i_blocks)); 3152 dip->di_nlink = cpu_to_le32(ip->i_nlink); 3153 if (!uid_valid(sbi->uid)) 3154 dip->di_uid = cpu_to_le32(i_uid_read(ip)); 3155 else 3156 dip->di_uid =cpu_to_le32(from_kuid(&init_user_ns, 3157 jfs_ip->saved_uid)); 3158 if (!gid_valid(sbi->gid)) 3159 dip->di_gid = cpu_to_le32(i_gid_read(ip)); 3160 else 3161 dip->di_gid = cpu_to_le32(from_kgid(&init_user_ns, 3162 jfs_ip->saved_gid)); 3163 jfs_get_inode_flags(jfs_ip); 3164 /* 3165 * mode2 is only needed for storing the higher order bits. 3166 * Trust i_mode for the lower order ones 3167 */ 3168 if (sbi->umask == -1) 3169 dip->di_mode = cpu_to_le32((jfs_ip->mode2 & 0xffff0000) | 3170 ip->i_mode); 3171 else /* Leave the original permissions alone */ 3172 dip->di_mode = cpu_to_le32(jfs_ip->mode2); 3173 3174 dip->di_atime.tv_sec = cpu_to_le32(ip->i_atime.tv_sec); 3175 dip->di_atime.tv_nsec = cpu_to_le32(ip->i_atime.tv_nsec); 3176 dip->di_ctime.tv_sec = cpu_to_le32(ip->i_ctime.tv_sec); 3177 dip->di_ctime.tv_nsec = cpu_to_le32(ip->i_ctime.tv_nsec); 3178 dip->di_mtime.tv_sec = cpu_to_le32(ip->i_mtime.tv_sec); 3179 dip->di_mtime.tv_nsec = cpu_to_le32(ip->i_mtime.tv_nsec); 3180 dip->di_ixpxd = jfs_ip->ixpxd; /* in-memory pxd's are little-endian */ 3181 dip->di_acl = jfs_ip->acl; /* as are dxd's */ 3182 dip->di_ea = jfs_ip->ea; 3183 dip->di_next_index = cpu_to_le32(jfs_ip->next_index); 3184 dip->di_otime.tv_sec = cpu_to_le32(jfs_ip->otime); 3185 dip->di_otime.tv_nsec = 0; 3186 dip->di_acltype = cpu_to_le32(jfs_ip->acltype); 3187 if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) 3188 dip->di_rdev = cpu_to_le32(jfs_ip->dev); 3189 } 3190