1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright © 2001-2007 Red Hat, Inc. 5 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> 6 * 7 * Created by David Woodhouse <dwmw2@infradead.org> 8 * 9 * For licensing information, see the file 'LICENCE' in this directory. 10 * 11 */ 12 13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 14 15 #include <linux/capability.h> 16 #include <linux/kernel.h> 17 #include <linux/sched.h> 18 #include <linux/cred.h> 19 #include <linux/fs.h> 20 #include <linux/list.h> 21 #include <linux/mtd/mtd.h> 22 #include <linux/pagemap.h> 23 #include <linux/slab.h> 24 #include <linux/vmalloc.h> 25 #include <linux/vfs.h> 26 #include <linux/crc32.h> 27 #include "nodelist.h" 28 29 static int jffs2_flash_setup(struct jffs2_sb_info *c); 30 31 int jffs2_do_setattr (struct inode *inode, struct iattr *iattr) 32 { 33 struct jffs2_full_dnode *old_metadata, *new_metadata; 34 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 35 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 36 struct jffs2_raw_inode *ri; 37 union jffs2_device_node dev; 38 unsigned char *mdata = NULL; 39 int mdatalen = 0; 40 unsigned int ivalid; 41 uint32_t alloclen; 42 int ret; 43 int alloc_type = ALLOC_NORMAL; 44 45 jffs2_dbg(1, "%s(): ino #%lu\n", __func__, inode->i_ino); 46 47 /* Special cases - we don't want more than one data node 48 for these types on the medium at any time. So setattr 49 must read the original data associated with the node 50 (i.e. the device numbers or the target name) and write 51 it out again with the appropriate data attached */ 52 if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) { 53 /* For these, we don't actually need to read the old node */ 54 mdatalen = jffs2_encode_dev(&dev, inode->i_rdev); 55 mdata = (char *)&dev; 56 jffs2_dbg(1, "%s(): Writing %d bytes of kdev_t\n", 57 __func__, mdatalen); 58 } else if (S_ISLNK(inode->i_mode)) { 59 mutex_lock(&f->sem); 60 mdatalen = f->metadata->size; 61 mdata = kmalloc(f->metadata->size, GFP_USER); 62 if (!mdata) { 63 mutex_unlock(&f->sem); 64 return -ENOMEM; 65 } 66 ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen); 67 if (ret) { 68 mutex_unlock(&f->sem); 69 kfree(mdata); 70 return ret; 71 } 72 mutex_unlock(&f->sem); 73 jffs2_dbg(1, "%s(): Writing %d bytes of symlink target\n", 74 __func__, mdatalen); 75 } 76 77 ri = jffs2_alloc_raw_inode(); 78 if (!ri) { 79 if (S_ISLNK(inode->i_mode)) 80 kfree(mdata); 81 return -ENOMEM; 82 } 83 84 ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen, 85 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 86 if (ret) { 87 jffs2_free_raw_inode(ri); 88 if (S_ISLNK(inode->i_mode)) 89 kfree(mdata); 90 return ret; 91 } 92 mutex_lock(&f->sem); 93 ivalid = iattr->ia_valid; 94 95 ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 96 ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); 97 ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen); 98 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 99 100 ri->ino = cpu_to_je32(inode->i_ino); 101 ri->version = cpu_to_je32(++f->highest_version); 102 103 ri->uid = cpu_to_je16((ivalid & ATTR_UID)? 104 from_kuid(&init_user_ns, iattr->ia_uid):i_uid_read(inode)); 105 ri->gid = cpu_to_je16((ivalid & ATTR_GID)? 106 from_kgid(&init_user_ns, iattr->ia_gid):i_gid_read(inode)); 107 108 if (ivalid & ATTR_MODE) 109 ri->mode = cpu_to_jemode(iattr->ia_mode); 110 else 111 ri->mode = cpu_to_jemode(inode->i_mode); 112 113 114 ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size); 115 ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime)); 116 ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime)); 117 ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime)); 118 119 ri->offset = cpu_to_je32(0); 120 ri->csize = ri->dsize = cpu_to_je32(mdatalen); 121 ri->compr = JFFS2_COMPR_NONE; 122 if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { 123 /* It's an extension. Make it a hole node */ 124 ri->compr = JFFS2_COMPR_ZERO; 125 ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size); 126 ri->offset = cpu_to_je32(inode->i_size); 127 } else if (ivalid & ATTR_SIZE && !iattr->ia_size) { 128 /* For truncate-to-zero, treat it as deletion because 129 it'll always be obsoleting all previous nodes */ 130 alloc_type = ALLOC_DELETION; 131 } 132 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 133 if (mdatalen) 134 ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen)); 135 else 136 ri->data_crc = cpu_to_je32(0); 137 138 new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type); 139 if (S_ISLNK(inode->i_mode)) 140 kfree(mdata); 141 142 if (IS_ERR(new_metadata)) { 143 jffs2_complete_reservation(c); 144 jffs2_free_raw_inode(ri); 145 mutex_unlock(&f->sem); 146 return PTR_ERR(new_metadata); 147 } 148 /* It worked. Update the inode */ 149 inode->i_atime = ITIME(je32_to_cpu(ri->atime)); 150 inode->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 151 inode->i_mtime = ITIME(je32_to_cpu(ri->mtime)); 152 inode->i_mode = jemode_to_cpu(ri->mode); 153 i_uid_write(inode, je16_to_cpu(ri->uid)); 154 i_gid_write(inode, je16_to_cpu(ri->gid)); 155 156 157 old_metadata = f->metadata; 158 159 if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) 160 jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); 161 162 if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { 163 jffs2_add_full_dnode_to_inode(c, f, new_metadata); 164 inode->i_size = iattr->ia_size; 165 inode->i_blocks = (inode->i_size + 511) >> 9; 166 f->metadata = NULL; 167 } else { 168 f->metadata = new_metadata; 169 } 170 if (old_metadata) { 171 jffs2_mark_node_obsolete(c, old_metadata->raw); 172 jffs2_free_full_dnode(old_metadata); 173 } 174 jffs2_free_raw_inode(ri); 175 176 mutex_unlock(&f->sem); 177 jffs2_complete_reservation(c); 178 179 /* We have to do the truncate_setsize() without f->sem held, since 180 some pages may be locked and waiting for it in readpage(). 181 We are protected from a simultaneous write() extending i_size 182 back past iattr->ia_size, because do_truncate() holds the 183 generic inode semaphore. */ 184 if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) { 185 truncate_setsize(inode, iattr->ia_size); 186 inode->i_blocks = (inode->i_size + 511) >> 9; 187 } 188 189 return 0; 190 } 191 192 int jffs2_setattr(struct dentry *dentry, struct iattr *iattr) 193 { 194 struct inode *inode = d_inode(dentry); 195 int rc; 196 197 rc = setattr_prepare(dentry, iattr); 198 if (rc) 199 return rc; 200 201 rc = jffs2_do_setattr(inode, iattr); 202 if (!rc && (iattr->ia_valid & ATTR_MODE)) 203 rc = posix_acl_chmod(inode, inode->i_mode); 204 205 return rc; 206 } 207 208 int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf) 209 { 210 struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb); 211 unsigned long avail; 212 213 buf->f_type = JFFS2_SUPER_MAGIC; 214 buf->f_bsize = 1 << PAGE_SHIFT; 215 buf->f_blocks = c->flash_size >> PAGE_SHIFT; 216 buf->f_files = 0; 217 buf->f_ffree = 0; 218 buf->f_namelen = JFFS2_MAX_NAME_LEN; 219 buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC; 220 buf->f_fsid.val[1] = c->mtd->index; 221 222 spin_lock(&c->erase_completion_lock); 223 avail = c->dirty_size + c->free_size; 224 if (avail > c->sector_size * c->resv_blocks_write) 225 avail -= c->sector_size * c->resv_blocks_write; 226 else 227 avail = 0; 228 spin_unlock(&c->erase_completion_lock); 229 230 buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; 231 232 return 0; 233 } 234 235 236 void jffs2_evict_inode (struct inode *inode) 237 { 238 /* We can forget about this inode for now - drop all 239 * the nodelists associated with it, etc. 240 */ 241 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 242 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 243 244 jffs2_dbg(1, "%s(): ino #%lu mode %o\n", 245 __func__, inode->i_ino, inode->i_mode); 246 truncate_inode_pages_final(&inode->i_data); 247 clear_inode(inode); 248 jffs2_do_clear_inode(c, f); 249 } 250 251 struct inode *jffs2_iget(struct super_block *sb, unsigned long ino) 252 { 253 struct jffs2_inode_info *f; 254 struct jffs2_sb_info *c; 255 struct jffs2_raw_inode latest_node; 256 union jffs2_device_node jdev; 257 struct inode *inode; 258 dev_t rdev = 0; 259 int ret; 260 261 jffs2_dbg(1, "%s(): ino == %lu\n", __func__, ino); 262 263 inode = iget_locked(sb, ino); 264 if (!inode) 265 return ERR_PTR(-ENOMEM); 266 if (!(inode->i_state & I_NEW)) 267 return inode; 268 269 f = JFFS2_INODE_INFO(inode); 270 c = JFFS2_SB_INFO(inode->i_sb); 271 272 jffs2_init_inode_info(f); 273 mutex_lock(&f->sem); 274 275 ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); 276 if (ret) 277 goto error; 278 279 inode->i_mode = jemode_to_cpu(latest_node.mode); 280 i_uid_write(inode, je16_to_cpu(latest_node.uid)); 281 i_gid_write(inode, je16_to_cpu(latest_node.gid)); 282 inode->i_size = je32_to_cpu(latest_node.isize); 283 inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); 284 inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); 285 inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); 286 287 set_nlink(inode, f->inocache->pino_nlink); 288 289 inode->i_blocks = (inode->i_size + 511) >> 9; 290 291 switch (inode->i_mode & S_IFMT) { 292 293 case S_IFLNK: 294 inode->i_op = &jffs2_symlink_inode_operations; 295 inode->i_link = f->target; 296 break; 297 298 case S_IFDIR: 299 { 300 struct jffs2_full_dirent *fd; 301 set_nlink(inode, 2); /* parent and '.' */ 302 303 for (fd=f->dents; fd; fd = fd->next) { 304 if (fd->type == DT_DIR && fd->ino) 305 inc_nlink(inode); 306 } 307 /* Root dir gets i_nlink 3 for some reason */ 308 if (inode->i_ino == 1) 309 inc_nlink(inode); 310 311 inode->i_op = &jffs2_dir_inode_operations; 312 inode->i_fop = &jffs2_dir_operations; 313 break; 314 } 315 case S_IFREG: 316 inode->i_op = &jffs2_file_inode_operations; 317 inode->i_fop = &jffs2_file_operations; 318 inode->i_mapping->a_ops = &jffs2_file_address_operations; 319 inode->i_mapping->nrpages = 0; 320 break; 321 322 case S_IFBLK: 323 case S_IFCHR: 324 /* Read the device numbers from the media */ 325 if (f->metadata->size != sizeof(jdev.old_id) && 326 f->metadata->size != sizeof(jdev.new_id)) { 327 pr_notice("Device node has strange size %d\n", 328 f->metadata->size); 329 goto error_io; 330 } 331 jffs2_dbg(1, "Reading device numbers from flash\n"); 332 ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size); 333 if (ret < 0) { 334 /* Eep */ 335 pr_notice("Read device numbers for inode %lu failed\n", 336 (unsigned long)inode->i_ino); 337 goto error; 338 } 339 if (f->metadata->size == sizeof(jdev.old_id)) 340 rdev = old_decode_dev(je16_to_cpu(jdev.old_id)); 341 else 342 rdev = new_decode_dev(je32_to_cpu(jdev.new_id)); 343 344 case S_IFSOCK: 345 case S_IFIFO: 346 inode->i_op = &jffs2_file_inode_operations; 347 init_special_inode(inode, inode->i_mode, rdev); 348 break; 349 350 default: 351 pr_warn("%s(): Bogus i_mode %o for ino %lu\n", 352 __func__, inode->i_mode, (unsigned long)inode->i_ino); 353 } 354 355 mutex_unlock(&f->sem); 356 357 jffs2_dbg(1, "jffs2_read_inode() returning\n"); 358 unlock_new_inode(inode); 359 return inode; 360 361 error_io: 362 ret = -EIO; 363 error: 364 mutex_unlock(&f->sem); 365 iget_failed(inode); 366 return ERR_PTR(ret); 367 } 368 369 void jffs2_dirty_inode(struct inode *inode, int flags) 370 { 371 struct iattr iattr; 372 373 if (!(inode->i_state & I_DIRTY_DATASYNC)) { 374 jffs2_dbg(2, "%s(): not calling setattr() for ino #%lu\n", 375 __func__, inode->i_ino); 376 return; 377 } 378 379 jffs2_dbg(1, "%s(): calling setattr() for ino #%lu\n", 380 __func__, inode->i_ino); 381 382 iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; 383 iattr.ia_mode = inode->i_mode; 384 iattr.ia_uid = inode->i_uid; 385 iattr.ia_gid = inode->i_gid; 386 iattr.ia_atime = inode->i_atime; 387 iattr.ia_mtime = inode->i_mtime; 388 iattr.ia_ctime = inode->i_ctime; 389 390 jffs2_do_setattr(inode, &iattr); 391 } 392 393 int jffs2_do_remount_fs(struct super_block *sb, int *flags, char *data) 394 { 395 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); 396 397 if (c->flags & JFFS2_SB_FLAG_RO && !sb_rdonly(sb)) 398 return -EROFS; 399 400 /* We stop if it was running, then restart if it needs to. 401 This also catches the case where it was stopped and this 402 is just a remount to restart it. 403 Flush the writebuffer, if neccecary, else we loose it */ 404 if (!sb_rdonly(sb)) { 405 jffs2_stop_garbage_collect_thread(c); 406 mutex_lock(&c->alloc_sem); 407 jffs2_flush_wbuf_pad(c); 408 mutex_unlock(&c->alloc_sem); 409 } 410 411 if (!(*flags & SB_RDONLY)) 412 jffs2_start_garbage_collect_thread(c); 413 414 *flags |= SB_NOATIME; 415 return 0; 416 } 417 418 /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, 419 fill in the raw_inode while you're at it. */ 420 struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_raw_inode *ri) 421 { 422 struct inode *inode; 423 struct super_block *sb = dir_i->i_sb; 424 struct jffs2_sb_info *c; 425 struct jffs2_inode_info *f; 426 int ret; 427 428 jffs2_dbg(1, "%s(): dir_i %ld, mode 0x%x\n", 429 __func__, dir_i->i_ino, mode); 430 431 c = JFFS2_SB_INFO(sb); 432 433 inode = new_inode(sb); 434 435 if (!inode) 436 return ERR_PTR(-ENOMEM); 437 438 f = JFFS2_INODE_INFO(inode); 439 jffs2_init_inode_info(f); 440 mutex_lock(&f->sem); 441 442 memset(ri, 0, sizeof(*ri)); 443 /* Set OS-specific defaults for new inodes */ 444 ri->uid = cpu_to_je16(from_kuid(&init_user_ns, current_fsuid())); 445 446 if (dir_i->i_mode & S_ISGID) { 447 ri->gid = cpu_to_je16(i_gid_read(dir_i)); 448 if (S_ISDIR(mode)) 449 mode |= S_ISGID; 450 } else { 451 ri->gid = cpu_to_je16(from_kgid(&init_user_ns, current_fsgid())); 452 } 453 454 /* POSIX ACLs have to be processed now, at least partly. 455 The umask is only applied if there's no default ACL */ 456 ret = jffs2_init_acl_pre(dir_i, inode, &mode); 457 if (ret) { 458 mutex_unlock(&f->sem); 459 make_bad_inode(inode); 460 iput(inode); 461 return ERR_PTR(ret); 462 } 463 ret = jffs2_do_new_inode (c, f, mode, ri); 464 if (ret) { 465 mutex_unlock(&f->sem); 466 make_bad_inode(inode); 467 iput(inode); 468 return ERR_PTR(ret); 469 } 470 set_nlink(inode, 1); 471 inode->i_ino = je32_to_cpu(ri->ino); 472 inode->i_mode = jemode_to_cpu(ri->mode); 473 i_gid_write(inode, je16_to_cpu(ri->gid)); 474 i_uid_write(inode, je16_to_cpu(ri->uid)); 475 inode->i_atime = inode->i_ctime = inode->i_mtime = current_time(inode); 476 ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); 477 478 inode->i_blocks = 0; 479 inode->i_size = 0; 480 481 if (insert_inode_locked(inode) < 0) { 482 mutex_unlock(&f->sem); 483 make_bad_inode(inode); 484 iput(inode); 485 return ERR_PTR(-EINVAL); 486 } 487 488 return inode; 489 } 490 491 static int calculate_inocache_hashsize(uint32_t flash_size) 492 { 493 /* 494 * Pick a inocache hash size based on the size of the medium. 495 * Count how many megabytes we're dealing with, apply a hashsize twice 496 * that size, but rounding down to the usual big powers of 2. And keep 497 * to sensible bounds. 498 */ 499 500 int size_mb = flash_size / 1024 / 1024; 501 int hashsize = (size_mb * 2) & ~0x3f; 502 503 if (hashsize < INOCACHE_HASHSIZE_MIN) 504 return INOCACHE_HASHSIZE_MIN; 505 if (hashsize > INOCACHE_HASHSIZE_MAX) 506 return INOCACHE_HASHSIZE_MAX; 507 508 return hashsize; 509 } 510 511 int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) 512 { 513 struct jffs2_sb_info *c; 514 struct inode *root_i; 515 int ret; 516 size_t blocks; 517 518 c = JFFS2_SB_INFO(sb); 519 520 /* Do not support the MLC nand */ 521 if (c->mtd->type == MTD_MLCNANDFLASH) 522 return -EINVAL; 523 524 #ifndef CONFIG_JFFS2_FS_WRITEBUFFER 525 if (c->mtd->type == MTD_NANDFLASH) { 526 pr_err("Cannot operate on NAND flash unless jffs2 NAND support is compiled in\n"); 527 return -EINVAL; 528 } 529 if (c->mtd->type == MTD_DATAFLASH) { 530 pr_err("Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in\n"); 531 return -EINVAL; 532 } 533 #endif 534 535 c->flash_size = c->mtd->size; 536 c->sector_size = c->mtd->erasesize; 537 blocks = c->flash_size / c->sector_size; 538 539 /* 540 * Size alignment check 541 */ 542 if ((c->sector_size * blocks) != c->flash_size) { 543 c->flash_size = c->sector_size * blocks; 544 pr_info("Flash size not aligned to erasesize, reducing to %dKiB\n", 545 c->flash_size / 1024); 546 } 547 548 if (c->flash_size < 5*c->sector_size) { 549 pr_err("Too few erase blocks (%d)\n", 550 c->flash_size / c->sector_size); 551 return -EINVAL; 552 } 553 554 c->cleanmarker_size = sizeof(struct jffs2_unknown_node); 555 556 /* NAND (or other bizarre) flash... do setup accordingly */ 557 ret = jffs2_flash_setup(c); 558 if (ret) 559 return ret; 560 561 c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size); 562 c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); 563 if (!c->inocache_list) { 564 ret = -ENOMEM; 565 goto out_wbuf; 566 } 567 568 jffs2_init_xattr_subsystem(c); 569 570 if ((ret = jffs2_do_mount_fs(c))) 571 goto out_inohash; 572 573 jffs2_dbg(1, "%s(): Getting root inode\n", __func__); 574 root_i = jffs2_iget(sb, 1); 575 if (IS_ERR(root_i)) { 576 jffs2_dbg(1, "get root inode failed\n"); 577 ret = PTR_ERR(root_i); 578 goto out_root; 579 } 580 581 ret = -ENOMEM; 582 583 jffs2_dbg(1, "%s(): d_make_root()\n", __func__); 584 sb->s_root = d_make_root(root_i); 585 if (!sb->s_root) 586 goto out_root; 587 588 sb->s_maxbytes = 0xFFFFFFFF; 589 sb->s_blocksize = PAGE_SIZE; 590 sb->s_blocksize_bits = PAGE_SHIFT; 591 sb->s_magic = JFFS2_SUPER_MAGIC; 592 if (!sb_rdonly(sb)) 593 jffs2_start_garbage_collect_thread(c); 594 return 0; 595 596 out_root: 597 jffs2_free_ino_caches(c); 598 jffs2_free_raw_node_refs(c); 599 kvfree(c->blocks); 600 out_inohash: 601 jffs2_clear_xattr_subsystem(c); 602 kfree(c->inocache_list); 603 out_wbuf: 604 jffs2_flash_cleanup(c); 605 606 return ret; 607 } 608 609 void jffs2_gc_release_inode(struct jffs2_sb_info *c, 610 struct jffs2_inode_info *f) 611 { 612 iput(OFNI_EDONI_2SFFJ(f)); 613 } 614 615 struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, 616 int inum, int unlinked) 617 { 618 struct inode *inode; 619 struct jffs2_inode_cache *ic; 620 621 if (unlinked) { 622 /* The inode has zero nlink but its nodes weren't yet marked 623 obsolete. This has to be because we're still waiting for 624 the final (close() and) iput() to happen. 625 626 There's a possibility that the final iput() could have 627 happened while we were contemplating. In order to ensure 628 that we don't cause a new read_inode() (which would fail) 629 for the inode in question, we use ilookup() in this case 630 instead of iget(). 631 632 The nlink can't _become_ zero at this point because we're 633 holding the alloc_sem, and jffs2_do_unlink() would also 634 need that while decrementing nlink on any inode. 635 */ 636 inode = ilookup(OFNI_BS_2SFFJ(c), inum); 637 if (!inode) { 638 jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted.\n", 639 inum); 640 641 spin_lock(&c->inocache_lock); 642 ic = jffs2_get_ino_cache(c, inum); 643 if (!ic) { 644 jffs2_dbg(1, "Inode cache for ino #%u is gone\n", 645 inum); 646 spin_unlock(&c->inocache_lock); 647 return NULL; 648 } 649 if (ic->state != INO_STATE_CHECKEDABSENT) { 650 /* Wait for progress. Don't just loop */ 651 jffs2_dbg(1, "Waiting for ino #%u in state %d\n", 652 ic->ino, ic->state); 653 sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); 654 } else { 655 spin_unlock(&c->inocache_lock); 656 } 657 658 return NULL; 659 } 660 } else { 661 /* Inode has links to it still; they're not going away because 662 jffs2_do_unlink() would need the alloc_sem and we have it. 663 Just iget() it, and if read_inode() is necessary that's OK. 664 */ 665 inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum); 666 if (IS_ERR(inode)) 667 return ERR_CAST(inode); 668 } 669 if (is_bad_inode(inode)) { 670 pr_notice("Eep. read_inode() failed for ino #%u. unlinked %d\n", 671 inum, unlinked); 672 /* NB. This will happen again. We need to do something appropriate here. */ 673 iput(inode); 674 return ERR_PTR(-EIO); 675 } 676 677 return JFFS2_INODE_INFO(inode); 678 } 679 680 unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, 681 struct jffs2_inode_info *f, 682 unsigned long offset, 683 unsigned long *priv) 684 { 685 struct inode *inode = OFNI_EDONI_2SFFJ(f); 686 struct page *pg; 687 688 pg = read_cache_page(inode->i_mapping, offset >> PAGE_SHIFT, 689 (void *)jffs2_do_readpage_unlock, inode); 690 if (IS_ERR(pg)) 691 return (void *)pg; 692 693 *priv = (unsigned long)pg; 694 return kmap(pg); 695 } 696 697 void jffs2_gc_release_page(struct jffs2_sb_info *c, 698 unsigned char *ptr, 699 unsigned long *priv) 700 { 701 struct page *pg = (void *)*priv; 702 703 kunmap(pg); 704 put_page(pg); 705 } 706 707 static int jffs2_flash_setup(struct jffs2_sb_info *c) { 708 int ret = 0; 709 710 if (jffs2_cleanmarker_oob(c)) { 711 /* NAND flash... do setup accordingly */ 712 ret = jffs2_nand_flash_setup(c); 713 if (ret) 714 return ret; 715 } 716 717 /* and Dataflash */ 718 if (jffs2_dataflash(c)) { 719 ret = jffs2_dataflash_setup(c); 720 if (ret) 721 return ret; 722 } 723 724 /* and Intel "Sibley" flash */ 725 if (jffs2_nor_wbuf_flash(c)) { 726 ret = jffs2_nor_wbuf_flash_setup(c); 727 if (ret) 728 return ret; 729 } 730 731 /* and an UBI volume */ 732 if (jffs2_ubivol(c)) { 733 ret = jffs2_ubivol_setup(c); 734 if (ret) 735 return ret; 736 } 737 738 return ret; 739 } 740 741 void jffs2_flash_cleanup(struct jffs2_sb_info *c) { 742 743 if (jffs2_cleanmarker_oob(c)) { 744 jffs2_nand_flash_cleanup(c); 745 } 746 747 /* and DataFlash */ 748 if (jffs2_dataflash(c)) { 749 jffs2_dataflash_cleanup(c); 750 } 751 752 /* and Intel "Sibley" flash */ 753 if (jffs2_nor_wbuf_flash(c)) { 754 jffs2_nor_wbuf_flash_cleanup(c); 755 } 756 757 /* and an UBI volume */ 758 if (jffs2_ubivol(c)) { 759 jffs2_ubivol_cleanup(c); 760 } 761 } 762