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/fs_context.h> 21 #include <linux/list.h> 22 #include <linux/mtd/mtd.h> 23 #include <linux/pagemap.h> 24 #include <linux/slab.h> 25 #include <linux/vmalloc.h> 26 #include <linux/vfs.h> 27 #include <linux/crc32.h> 28 #include "nodelist.h" 29 30 static int jffs2_flash_setup(struct jffs2_sb_info *c); 31 32 int jffs2_do_setattr (struct inode *inode, struct iattr *iattr) 33 { 34 struct jffs2_full_dnode *old_metadata, *new_metadata; 35 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 36 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 37 struct jffs2_raw_inode *ri; 38 union jffs2_device_node dev; 39 unsigned char *mdata = NULL; 40 int mdatalen = 0; 41 unsigned int ivalid; 42 uint32_t alloclen; 43 int ret; 44 int alloc_type = ALLOC_NORMAL; 45 46 jffs2_dbg(1, "%s(): ino #%lu\n", __func__, inode->i_ino); 47 48 /* Special cases - we don't want more than one data node 49 for these types on the medium at any time. So setattr 50 must read the original data associated with the node 51 (i.e. the device numbers or the target name) and write 52 it out again with the appropriate data attached */ 53 if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) { 54 /* For these, we don't actually need to read the old node */ 55 mdatalen = jffs2_encode_dev(&dev, inode->i_rdev); 56 mdata = (char *)&dev; 57 jffs2_dbg(1, "%s(): Writing %d bytes of kdev_t\n", 58 __func__, mdatalen); 59 } else if (S_ISLNK(inode->i_mode)) { 60 mutex_lock(&f->sem); 61 mdatalen = f->metadata->size; 62 mdata = kmalloc(f->metadata->size, GFP_USER); 63 if (!mdata) { 64 mutex_unlock(&f->sem); 65 return -ENOMEM; 66 } 67 ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen); 68 if (ret) { 69 mutex_unlock(&f->sem); 70 kfree(mdata); 71 return ret; 72 } 73 mutex_unlock(&f->sem); 74 jffs2_dbg(1, "%s(): Writing %d bytes of symlink target\n", 75 __func__, mdatalen); 76 } 77 78 ri = jffs2_alloc_raw_inode(); 79 if (!ri) { 80 if (S_ISLNK(inode->i_mode)) 81 kfree(mdata); 82 return -ENOMEM; 83 } 84 85 ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen, 86 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 87 if (ret) { 88 jffs2_free_raw_inode(ri); 89 if (S_ISLNK(inode->i_mode)) 90 kfree(mdata); 91 return ret; 92 } 93 mutex_lock(&f->sem); 94 ivalid = iattr->ia_valid; 95 96 ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 97 ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); 98 ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen); 99 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 100 101 ri->ino = cpu_to_je32(inode->i_ino); 102 ri->version = cpu_to_je32(++f->highest_version); 103 104 ri->uid = cpu_to_je16((ivalid & ATTR_UID)? 105 from_kuid(&init_user_ns, iattr->ia_uid):i_uid_read(inode)); 106 ri->gid = cpu_to_je16((ivalid & ATTR_GID)? 107 from_kgid(&init_user_ns, iattr->ia_gid):i_gid_read(inode)); 108 109 if (ivalid & ATTR_MODE) 110 ri->mode = cpu_to_jemode(iattr->ia_mode); 111 else 112 ri->mode = cpu_to_jemode(inode->i_mode); 113 114 115 ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size); 116 ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime)); 117 ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime)); 118 ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode_get_ctime(inode))); 119 120 ri->offset = cpu_to_je32(0); 121 ri->csize = ri->dsize = cpu_to_je32(mdatalen); 122 ri->compr = JFFS2_COMPR_NONE; 123 if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { 124 /* It's an extension. Make it a hole node */ 125 ri->compr = JFFS2_COMPR_ZERO; 126 ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size); 127 ri->offset = cpu_to_je32(inode->i_size); 128 } else if (ivalid & ATTR_SIZE && !iattr->ia_size) { 129 /* For truncate-to-zero, treat it as deletion because 130 it'll always be obsoleting all previous nodes */ 131 alloc_type = ALLOC_DELETION; 132 } 133 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 134 if (mdatalen) 135 ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen)); 136 else 137 ri->data_crc = cpu_to_je32(0); 138 139 new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type); 140 if (S_ISLNK(inode->i_mode)) 141 kfree(mdata); 142 143 if (IS_ERR(new_metadata)) { 144 jffs2_complete_reservation(c); 145 jffs2_free_raw_inode(ri); 146 mutex_unlock(&f->sem); 147 return PTR_ERR(new_metadata); 148 } 149 /* It worked. Update the inode */ 150 inode->i_atime = ITIME(je32_to_cpu(ri->atime)); 151 inode_set_ctime_to_ts(inode, ITIME(je32_to_cpu(ri->ctime))); 152 inode->i_mtime = ITIME(je32_to_cpu(ri->mtime)); 153 inode->i_mode = jemode_to_cpu(ri->mode); 154 i_uid_write(inode, je16_to_cpu(ri->uid)); 155 i_gid_write(inode, je16_to_cpu(ri->gid)); 156 157 158 old_metadata = f->metadata; 159 160 if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) 161 jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); 162 163 if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { 164 jffs2_add_full_dnode_to_inode(c, f, new_metadata); 165 inode->i_size = iattr->ia_size; 166 inode->i_blocks = (inode->i_size + 511) >> 9; 167 f->metadata = NULL; 168 } else { 169 f->metadata = new_metadata; 170 } 171 if (old_metadata) { 172 jffs2_mark_node_obsolete(c, old_metadata->raw); 173 jffs2_free_full_dnode(old_metadata); 174 } 175 jffs2_free_raw_inode(ri); 176 177 mutex_unlock(&f->sem); 178 jffs2_complete_reservation(c); 179 180 /* We have to do the truncate_setsize() without f->sem held, since 181 some pages may be locked and waiting for it in read_folio(). 182 We are protected from a simultaneous write() extending i_size 183 back past iattr->ia_size, because do_truncate() holds the 184 generic inode semaphore. */ 185 if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) { 186 truncate_setsize(inode, iattr->ia_size); 187 inode->i_blocks = (inode->i_size + 511) >> 9; 188 } 189 190 return 0; 191 } 192 193 int jffs2_setattr(struct mnt_idmap *idmap, struct dentry *dentry, 194 struct iattr *iattr) 195 { 196 struct inode *inode = d_inode(dentry); 197 int rc; 198 199 rc = setattr_prepare(&nop_mnt_idmap, dentry, iattr); 200 if (rc) 201 return rc; 202 203 rc = jffs2_do_setattr(inode, iattr); 204 if (!rc && (iattr->ia_valid & ATTR_MODE)) 205 rc = posix_acl_chmod(&nop_mnt_idmap, dentry, inode->i_mode); 206 207 return rc; 208 } 209 210 int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf) 211 { 212 struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb); 213 unsigned long avail; 214 215 buf->f_type = JFFS2_SUPER_MAGIC; 216 buf->f_bsize = 1 << PAGE_SHIFT; 217 buf->f_blocks = c->flash_size >> PAGE_SHIFT; 218 buf->f_files = 0; 219 buf->f_ffree = 0; 220 buf->f_namelen = JFFS2_MAX_NAME_LEN; 221 buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC; 222 buf->f_fsid.val[1] = c->mtd->index; 223 224 spin_lock(&c->erase_completion_lock); 225 avail = c->dirty_size + c->free_size; 226 if (avail > c->sector_size * c->resv_blocks_write) 227 avail -= c->sector_size * c->resv_blocks_write; 228 else 229 avail = 0; 230 spin_unlock(&c->erase_completion_lock); 231 232 buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; 233 234 return 0; 235 } 236 237 238 void jffs2_evict_inode (struct inode *inode) 239 { 240 /* We can forget about this inode for now - drop all 241 * the nodelists associated with it, etc. 242 */ 243 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 244 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 245 246 jffs2_dbg(1, "%s(): ino #%lu mode %o\n", 247 __func__, inode->i_ino, inode->i_mode); 248 truncate_inode_pages_final(&inode->i_data); 249 clear_inode(inode); 250 jffs2_do_clear_inode(c, f); 251 } 252 253 struct inode *jffs2_iget(struct super_block *sb, unsigned long ino) 254 { 255 struct jffs2_inode_info *f; 256 struct jffs2_sb_info *c; 257 struct jffs2_raw_inode latest_node; 258 union jffs2_device_node jdev; 259 struct inode *inode; 260 dev_t rdev = 0; 261 int ret; 262 263 jffs2_dbg(1, "%s(): ino == %lu\n", __func__, ino); 264 265 inode = iget_locked(sb, ino); 266 if (!inode) 267 return ERR_PTR(-ENOMEM); 268 if (!(inode->i_state & I_NEW)) 269 return inode; 270 271 f = JFFS2_INODE_INFO(inode); 272 c = JFFS2_SB_INFO(inode->i_sb); 273 274 jffs2_init_inode_info(f); 275 mutex_lock(&f->sem); 276 277 ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); 278 if (ret) 279 goto error; 280 281 inode->i_mode = jemode_to_cpu(latest_node.mode); 282 i_uid_write(inode, je16_to_cpu(latest_node.uid)); 283 i_gid_write(inode, je16_to_cpu(latest_node.gid)); 284 inode->i_size = je32_to_cpu(latest_node.isize); 285 inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); 286 inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); 287 inode_set_ctime_to_ts(inode, ITIME(je32_to_cpu(latest_node.ctime))); 288 289 set_nlink(inode, f->inocache->pino_nlink); 290 291 inode->i_blocks = (inode->i_size + 511) >> 9; 292 293 switch (inode->i_mode & S_IFMT) { 294 295 case S_IFLNK: 296 inode->i_op = &jffs2_symlink_inode_operations; 297 inode->i_link = f->target; 298 break; 299 300 case S_IFDIR: 301 { 302 struct jffs2_full_dirent *fd; 303 set_nlink(inode, 2); /* parent and '.' */ 304 305 for (fd=f->dents; fd; fd = fd->next) { 306 if (fd->type == DT_DIR && fd->ino) 307 inc_nlink(inode); 308 } 309 /* Root dir gets i_nlink 3 for some reason */ 310 if (inode->i_ino == 1) 311 inc_nlink(inode); 312 313 inode->i_op = &jffs2_dir_inode_operations; 314 inode->i_fop = &jffs2_dir_operations; 315 break; 316 } 317 case S_IFREG: 318 inode->i_op = &jffs2_file_inode_operations; 319 inode->i_fop = &jffs2_file_operations; 320 inode->i_mapping->a_ops = &jffs2_file_address_operations; 321 inode->i_mapping->nrpages = 0; 322 break; 323 324 case S_IFBLK: 325 case S_IFCHR: 326 /* Read the device numbers from the media */ 327 if (f->metadata->size != sizeof(jdev.old_id) && 328 f->metadata->size != sizeof(jdev.new_id)) { 329 pr_notice("Device node has strange size %d\n", 330 f->metadata->size); 331 goto error_io; 332 } 333 jffs2_dbg(1, "Reading device numbers from flash\n"); 334 ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size); 335 if (ret < 0) { 336 /* Eep */ 337 pr_notice("Read device numbers for inode %lu failed\n", 338 (unsigned long)inode->i_ino); 339 goto error; 340 } 341 if (f->metadata->size == sizeof(jdev.old_id)) 342 rdev = old_decode_dev(je16_to_cpu(jdev.old_id)); 343 else 344 rdev = new_decode_dev(je32_to_cpu(jdev.new_id)); 345 fallthrough; 346 347 case S_IFSOCK: 348 case S_IFIFO: 349 inode->i_op = &jffs2_file_inode_operations; 350 init_special_inode(inode, inode->i_mode, rdev); 351 break; 352 353 default: 354 pr_warn("%s(): Bogus i_mode %o for ino %lu\n", 355 __func__, inode->i_mode, (unsigned long)inode->i_ino); 356 } 357 358 mutex_unlock(&f->sem); 359 360 jffs2_dbg(1, "jffs2_read_inode() returning\n"); 361 unlock_new_inode(inode); 362 return inode; 363 364 error_io: 365 ret = -EIO; 366 error: 367 mutex_unlock(&f->sem); 368 iget_failed(inode); 369 return ERR_PTR(ret); 370 } 371 372 void jffs2_dirty_inode(struct inode *inode, int flags) 373 { 374 struct iattr iattr; 375 376 if (!(inode->i_state & I_DIRTY_DATASYNC)) { 377 jffs2_dbg(2, "%s(): not calling setattr() for ino #%lu\n", 378 __func__, inode->i_ino); 379 return; 380 } 381 382 jffs2_dbg(1, "%s(): calling setattr() for ino #%lu\n", 383 __func__, inode->i_ino); 384 385 iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; 386 iattr.ia_mode = inode->i_mode; 387 iattr.ia_uid = inode->i_uid; 388 iattr.ia_gid = inode->i_gid; 389 iattr.ia_atime = inode->i_atime; 390 iattr.ia_mtime = inode->i_mtime; 391 iattr.ia_ctime = inode_get_ctime(inode); 392 393 jffs2_do_setattr(inode, &iattr); 394 } 395 396 int jffs2_do_remount_fs(struct super_block *sb, struct fs_context *fc) 397 { 398 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); 399 400 if (c->flags & JFFS2_SB_FLAG_RO && !sb_rdonly(sb)) 401 return -EROFS; 402 403 /* We stop if it was running, then restart if it needs to. 404 This also catches the case where it was stopped and this 405 is just a remount to restart it. 406 Flush the writebuffer, if necessary, else we loose it */ 407 if (!sb_rdonly(sb)) { 408 jffs2_stop_garbage_collect_thread(c); 409 mutex_lock(&c->alloc_sem); 410 jffs2_flush_wbuf_pad(c); 411 mutex_unlock(&c->alloc_sem); 412 } 413 414 if (!(fc->sb_flags & SB_RDONLY)) 415 jffs2_start_garbage_collect_thread(c); 416 417 fc->sb_flags |= SB_NOATIME; 418 return 0; 419 } 420 421 /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, 422 fill in the raw_inode while you're at it. */ 423 struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_raw_inode *ri) 424 { 425 struct inode *inode; 426 struct super_block *sb = dir_i->i_sb; 427 struct jffs2_sb_info *c; 428 struct jffs2_inode_info *f; 429 int ret; 430 431 jffs2_dbg(1, "%s(): dir_i %ld, mode 0x%x\n", 432 __func__, dir_i->i_ino, mode); 433 434 c = JFFS2_SB_INFO(sb); 435 436 inode = new_inode(sb); 437 438 if (!inode) 439 return ERR_PTR(-ENOMEM); 440 441 f = JFFS2_INODE_INFO(inode); 442 jffs2_init_inode_info(f); 443 mutex_lock(&f->sem); 444 445 memset(ri, 0, sizeof(*ri)); 446 /* Set OS-specific defaults for new inodes */ 447 ri->uid = cpu_to_je16(from_kuid(&init_user_ns, current_fsuid())); 448 449 if (dir_i->i_mode & S_ISGID) { 450 ri->gid = cpu_to_je16(i_gid_read(dir_i)); 451 if (S_ISDIR(mode)) 452 mode |= S_ISGID; 453 } else { 454 ri->gid = cpu_to_je16(from_kgid(&init_user_ns, current_fsgid())); 455 } 456 457 /* POSIX ACLs have to be processed now, at least partly. 458 The umask is only applied if there's no default ACL */ 459 ret = jffs2_init_acl_pre(dir_i, inode, &mode); 460 if (ret) { 461 mutex_unlock(&f->sem); 462 make_bad_inode(inode); 463 iput(inode); 464 return ERR_PTR(ret); 465 } 466 ret = jffs2_do_new_inode (c, f, mode, ri); 467 if (ret) { 468 mutex_unlock(&f->sem); 469 make_bad_inode(inode); 470 iput(inode); 471 return ERR_PTR(ret); 472 } 473 set_nlink(inode, 1); 474 inode->i_ino = je32_to_cpu(ri->ino); 475 inode->i_mode = jemode_to_cpu(ri->mode); 476 i_gid_write(inode, je16_to_cpu(ri->gid)); 477 i_uid_write(inode, je16_to_cpu(ri->uid)); 478 inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode); 479 ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); 480 481 inode->i_blocks = 0; 482 inode->i_size = 0; 483 484 if (insert_inode_locked(inode) < 0) { 485 mutex_unlock(&f->sem); 486 make_bad_inode(inode); 487 iput(inode); 488 return ERR_PTR(-EINVAL); 489 } 490 491 return inode; 492 } 493 494 static int calculate_inocache_hashsize(uint32_t flash_size) 495 { 496 /* 497 * Pick a inocache hash size based on the size of the medium. 498 * Count how many megabytes we're dealing with, apply a hashsize twice 499 * that size, but rounding down to the usual big powers of 2. And keep 500 * to sensible bounds. 501 */ 502 503 int size_mb = flash_size / 1024 / 1024; 504 int hashsize = (size_mb * 2) & ~0x3f; 505 506 if (hashsize < INOCACHE_HASHSIZE_MIN) 507 return INOCACHE_HASHSIZE_MIN; 508 if (hashsize > INOCACHE_HASHSIZE_MAX) 509 return INOCACHE_HASHSIZE_MAX; 510 511 return hashsize; 512 } 513 514 int jffs2_do_fill_super(struct super_block *sb, struct fs_context *fc) 515 { 516 struct jffs2_sb_info *c; 517 struct inode *root_i; 518 int ret; 519 size_t blocks; 520 521 c = JFFS2_SB_INFO(sb); 522 523 /* Do not support the MLC nand */ 524 if (c->mtd->type == MTD_MLCNANDFLASH) 525 return -EINVAL; 526 527 #ifndef CONFIG_JFFS2_FS_WRITEBUFFER 528 if (c->mtd->type == MTD_NANDFLASH) { 529 errorf(fc, "Cannot operate on NAND flash unless jffs2 NAND support is compiled in"); 530 return -EINVAL; 531 } 532 if (c->mtd->type == MTD_DATAFLASH) { 533 errorf(fc, "Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in"); 534 return -EINVAL; 535 } 536 #endif 537 538 c->flash_size = c->mtd->size; 539 c->sector_size = c->mtd->erasesize; 540 blocks = c->flash_size / c->sector_size; 541 542 /* 543 * Size alignment check 544 */ 545 if ((c->sector_size * blocks) != c->flash_size) { 546 c->flash_size = c->sector_size * blocks; 547 infof(fc, "Flash size not aligned to erasesize, reducing to %dKiB", 548 c->flash_size / 1024); 549 } 550 551 if (c->flash_size < 5*c->sector_size) { 552 errorf(fc, "Too few erase blocks (%d)", 553 c->flash_size / c->sector_size); 554 return -EINVAL; 555 } 556 557 c->cleanmarker_size = sizeof(struct jffs2_unknown_node); 558 559 /* NAND (or other bizarre) flash... do setup accordingly */ 560 ret = jffs2_flash_setup(c); 561 if (ret) 562 return ret; 563 564 c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size); 565 c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); 566 if (!c->inocache_list) { 567 ret = -ENOMEM; 568 goto out_wbuf; 569 } 570 571 jffs2_init_xattr_subsystem(c); 572 573 if ((ret = jffs2_do_mount_fs(c))) 574 goto out_inohash; 575 576 jffs2_dbg(1, "%s(): Getting root inode\n", __func__); 577 root_i = jffs2_iget(sb, 1); 578 if (IS_ERR(root_i)) { 579 jffs2_dbg(1, "get root inode failed\n"); 580 ret = PTR_ERR(root_i); 581 goto out_root; 582 } 583 584 ret = -ENOMEM; 585 586 jffs2_dbg(1, "%s(): d_make_root()\n", __func__); 587 sb->s_root = d_make_root(root_i); 588 if (!sb->s_root) 589 goto out_root; 590 591 sb->s_maxbytes = 0xFFFFFFFF; 592 sb->s_blocksize = PAGE_SIZE; 593 sb->s_blocksize_bits = PAGE_SHIFT; 594 sb->s_magic = JFFS2_SUPER_MAGIC; 595 sb->s_time_min = 0; 596 sb->s_time_max = U32_MAX; 597 598 if (!sb_rdonly(sb)) 599 jffs2_start_garbage_collect_thread(c); 600 return 0; 601 602 out_root: 603 jffs2_free_ino_caches(c); 604 jffs2_free_raw_node_refs(c); 605 kvfree(c->blocks); 606 jffs2_clear_xattr_subsystem(c); 607 jffs2_sum_exit(c); 608 out_inohash: 609 kfree(c->inocache_list); 610 out_wbuf: 611 jffs2_flash_cleanup(c); 612 613 return ret; 614 } 615 616 void jffs2_gc_release_inode(struct jffs2_sb_info *c, 617 struct jffs2_inode_info *f) 618 { 619 iput(OFNI_EDONI_2SFFJ(f)); 620 } 621 622 struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, 623 int inum, int unlinked) 624 { 625 struct inode *inode; 626 struct jffs2_inode_cache *ic; 627 628 if (unlinked) { 629 /* The inode has zero nlink but its nodes weren't yet marked 630 obsolete. This has to be because we're still waiting for 631 the final (close() and) iput() to happen. 632 633 There's a possibility that the final iput() could have 634 happened while we were contemplating. In order to ensure 635 that we don't cause a new read_inode() (which would fail) 636 for the inode in question, we use ilookup() in this case 637 instead of iget(). 638 639 The nlink can't _become_ zero at this point because we're 640 holding the alloc_sem, and jffs2_do_unlink() would also 641 need that while decrementing nlink on any inode. 642 */ 643 inode = ilookup(OFNI_BS_2SFFJ(c), inum); 644 if (!inode) { 645 jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted.\n", 646 inum); 647 648 spin_lock(&c->inocache_lock); 649 ic = jffs2_get_ino_cache(c, inum); 650 if (!ic) { 651 jffs2_dbg(1, "Inode cache for ino #%u is gone\n", 652 inum); 653 spin_unlock(&c->inocache_lock); 654 return NULL; 655 } 656 if (ic->state != INO_STATE_CHECKEDABSENT) { 657 /* Wait for progress. Don't just loop */ 658 jffs2_dbg(1, "Waiting for ino #%u in state %d\n", 659 ic->ino, ic->state); 660 sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); 661 } else { 662 spin_unlock(&c->inocache_lock); 663 } 664 665 return NULL; 666 } 667 } else { 668 /* Inode has links to it still; they're not going away because 669 jffs2_do_unlink() would need the alloc_sem and we have it. 670 Just iget() it, and if read_inode() is necessary that's OK. 671 */ 672 inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum); 673 if (IS_ERR(inode)) 674 return ERR_CAST(inode); 675 } 676 if (is_bad_inode(inode)) { 677 pr_notice("Eep. read_inode() failed for ino #%u. unlinked %d\n", 678 inum, unlinked); 679 /* NB. This will happen again. We need to do something appropriate here. */ 680 iput(inode); 681 return ERR_PTR(-EIO); 682 } 683 684 return JFFS2_INODE_INFO(inode); 685 } 686 687 static int jffs2_flash_setup(struct jffs2_sb_info *c) { 688 int ret = 0; 689 690 if (jffs2_cleanmarker_oob(c)) { 691 /* NAND flash... do setup accordingly */ 692 ret = jffs2_nand_flash_setup(c); 693 if (ret) 694 return ret; 695 } 696 697 /* and Dataflash */ 698 if (jffs2_dataflash(c)) { 699 ret = jffs2_dataflash_setup(c); 700 if (ret) 701 return ret; 702 } 703 704 /* and Intel "Sibley" flash */ 705 if (jffs2_nor_wbuf_flash(c)) { 706 ret = jffs2_nor_wbuf_flash_setup(c); 707 if (ret) 708 return ret; 709 } 710 711 /* and an UBI volume */ 712 if (jffs2_ubivol(c)) { 713 ret = jffs2_ubivol_setup(c); 714 if (ret) 715 return ret; 716 } 717 718 return ret; 719 } 720 721 void jffs2_flash_cleanup(struct jffs2_sb_info *c) { 722 723 if (jffs2_cleanmarker_oob(c)) { 724 jffs2_nand_flash_cleanup(c); 725 } 726 727 /* and DataFlash */ 728 if (jffs2_dataflash(c)) { 729 jffs2_dataflash_cleanup(c); 730 } 731 732 /* and Intel "Sibley" flash */ 733 if (jffs2_nor_wbuf_flash(c)) { 734 jffs2_nor_wbuf_flash_cleanup(c); 735 } 736 737 /* and an UBI volume */ 738 if (jffs2_ubivol(c)) { 739 jffs2_ubivol_cleanup(c); 740 } 741 } 742