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/fs.h> 19 #include <linux/list.h> 20 #include <linux/mtd/mtd.h> 21 #include <linux/pagemap.h> 22 #include <linux/slab.h> 23 #include <linux/vmalloc.h> 24 #include <linux/vfs.h> 25 #include <linux/crc32.h> 26 #include "nodelist.h" 27 28 static int jffs2_flash_setup(struct jffs2_sb_info *c); 29 30 int jffs2_do_setattr (struct inode *inode, struct iattr *iattr) 31 { 32 struct jffs2_full_dnode *old_metadata, *new_metadata; 33 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 34 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 35 struct jffs2_raw_inode *ri; 36 union jffs2_device_node dev; 37 unsigned char *mdata = NULL; 38 int mdatalen = 0; 39 unsigned int ivalid; 40 uint32_t alloclen; 41 int ret; 42 int alloc_type = ALLOC_NORMAL; 43 44 jffs2_dbg(1, "%s(): ino #%lu\n", __func__, inode->i_ino); 45 46 /* Special cases - we don't want more than one data node 47 for these types on the medium at any time. So setattr 48 must read the original data associated with the node 49 (i.e. the device numbers or the target name) and write 50 it out again with the appropriate data attached */ 51 if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) { 52 /* For these, we don't actually need to read the old node */ 53 mdatalen = jffs2_encode_dev(&dev, inode->i_rdev); 54 mdata = (char *)&dev; 55 jffs2_dbg(1, "%s(): Writing %d bytes of kdev_t\n", 56 __func__, mdatalen); 57 } else if (S_ISLNK(inode->i_mode)) { 58 mutex_lock(&f->sem); 59 mdatalen = f->metadata->size; 60 mdata = kmalloc(f->metadata->size, GFP_USER); 61 if (!mdata) { 62 mutex_unlock(&f->sem); 63 return -ENOMEM; 64 } 65 ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen); 66 if (ret) { 67 mutex_unlock(&f->sem); 68 kfree(mdata); 69 return ret; 70 } 71 mutex_unlock(&f->sem); 72 jffs2_dbg(1, "%s(): Writing %d bytes of symlink target\n", 73 __func__, mdatalen); 74 } 75 76 ri = jffs2_alloc_raw_inode(); 77 if (!ri) { 78 if (S_ISLNK(inode->i_mode)) 79 kfree(mdata); 80 return -ENOMEM; 81 } 82 83 ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen, 84 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 85 if (ret) { 86 jffs2_free_raw_inode(ri); 87 if (S_ISLNK(inode->i_mode)) 88 kfree(mdata); 89 return ret; 90 } 91 mutex_lock(&f->sem); 92 ivalid = iattr->ia_valid; 93 94 ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 95 ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); 96 ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen); 97 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 98 99 ri->ino = cpu_to_je32(inode->i_ino); 100 ri->version = cpu_to_je32(++f->highest_version); 101 102 ri->uid = cpu_to_je16((ivalid & ATTR_UID)? 103 from_kuid(&init_user_ns, iattr->ia_uid):i_uid_read(inode)); 104 ri->gid = cpu_to_je16((ivalid & ATTR_GID)? 105 from_kgid(&init_user_ns, iattr->ia_gid):i_gid_read(inode)); 106 107 if (ivalid & ATTR_MODE) 108 ri->mode = cpu_to_jemode(iattr->ia_mode); 109 else 110 ri->mode = cpu_to_jemode(inode->i_mode); 111 112 113 ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size); 114 ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime)); 115 ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime)); 116 ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime)); 117 118 ri->offset = cpu_to_je32(0); 119 ri->csize = ri->dsize = cpu_to_je32(mdatalen); 120 ri->compr = JFFS2_COMPR_NONE; 121 if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { 122 /* It's an extension. Make it a hole node */ 123 ri->compr = JFFS2_COMPR_ZERO; 124 ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size); 125 ri->offset = cpu_to_je32(inode->i_size); 126 } else if (ivalid & ATTR_SIZE && !iattr->ia_size) { 127 /* For truncate-to-zero, treat it as deletion because 128 it'll always be obsoleting all previous nodes */ 129 alloc_type = ALLOC_DELETION; 130 } 131 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 132 if (mdatalen) 133 ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen)); 134 else 135 ri->data_crc = cpu_to_je32(0); 136 137 new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type); 138 if (S_ISLNK(inode->i_mode)) 139 kfree(mdata); 140 141 if (IS_ERR(new_metadata)) { 142 jffs2_complete_reservation(c); 143 jffs2_free_raw_inode(ri); 144 mutex_unlock(&f->sem); 145 return PTR_ERR(new_metadata); 146 } 147 /* It worked. Update the inode */ 148 inode->i_atime = ITIME(je32_to_cpu(ri->atime)); 149 inode->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 150 inode->i_mtime = ITIME(je32_to_cpu(ri->mtime)); 151 inode->i_mode = jemode_to_cpu(ri->mode); 152 i_uid_write(inode, je16_to_cpu(ri->uid)); 153 i_gid_write(inode, je16_to_cpu(ri->gid)); 154 155 156 old_metadata = f->metadata; 157 158 if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) 159 jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); 160 161 if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { 162 jffs2_add_full_dnode_to_inode(c, f, new_metadata); 163 inode->i_size = iattr->ia_size; 164 inode->i_blocks = (inode->i_size + 511) >> 9; 165 f->metadata = NULL; 166 } else { 167 f->metadata = new_metadata; 168 } 169 if (old_metadata) { 170 jffs2_mark_node_obsolete(c, old_metadata->raw); 171 jffs2_free_full_dnode(old_metadata); 172 } 173 jffs2_free_raw_inode(ri); 174 175 mutex_unlock(&f->sem); 176 jffs2_complete_reservation(c); 177 178 /* We have to do the truncate_setsize() without f->sem held, since 179 some pages may be locked and waiting for it in readpage(). 180 We are protected from a simultaneous write() extending i_size 181 back past iattr->ia_size, because do_truncate() holds the 182 generic inode semaphore. */ 183 if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) { 184 truncate_setsize(inode, iattr->ia_size); 185 inode->i_blocks = (inode->i_size + 511) >> 9; 186 } 187 188 return 0; 189 } 190 191 int jffs2_setattr(struct dentry *dentry, struct iattr *iattr) 192 { 193 int rc; 194 195 rc = inode_change_ok(dentry->d_inode, iattr); 196 if (rc) 197 return rc; 198 199 rc = jffs2_do_setattr(dentry->d_inode, iattr); 200 if (!rc && (iattr->ia_valid & ATTR_MODE)) 201 rc = jffs2_acl_chmod(dentry->d_inode); 202 203 return rc; 204 } 205 206 int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf) 207 { 208 struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb); 209 unsigned long avail; 210 211 buf->f_type = JFFS2_SUPER_MAGIC; 212 buf->f_bsize = 1 << PAGE_SHIFT; 213 buf->f_blocks = c->flash_size >> PAGE_SHIFT; 214 buf->f_files = 0; 215 buf->f_ffree = 0; 216 buf->f_namelen = JFFS2_MAX_NAME_LEN; 217 buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC; 218 buf->f_fsid.val[1] = c->mtd->index; 219 220 spin_lock(&c->erase_completion_lock); 221 avail = c->dirty_size + c->free_size; 222 if (avail > c->sector_size * c->resv_blocks_write) 223 avail -= c->sector_size * c->resv_blocks_write; 224 else 225 avail = 0; 226 spin_unlock(&c->erase_completion_lock); 227 228 buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; 229 230 return 0; 231 } 232 233 234 void jffs2_evict_inode (struct inode *inode) 235 { 236 /* We can forget about this inode for now - drop all 237 * the nodelists associated with it, etc. 238 */ 239 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 240 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 241 242 jffs2_dbg(1, "%s(): ino #%lu mode %o\n", 243 __func__, inode->i_ino, inode->i_mode); 244 truncate_inode_pages(&inode->i_data, 0); 245 clear_inode(inode); 246 jffs2_do_clear_inode(c, f); 247 } 248 249 struct inode *jffs2_iget(struct super_block *sb, unsigned long ino) 250 { 251 struct jffs2_inode_info *f; 252 struct jffs2_sb_info *c; 253 struct jffs2_raw_inode latest_node; 254 union jffs2_device_node jdev; 255 struct inode *inode; 256 dev_t rdev = 0; 257 int ret; 258 259 jffs2_dbg(1, "%s(): ino == %lu\n", __func__, ino); 260 261 inode = iget_locked(sb, ino); 262 if (!inode) 263 return ERR_PTR(-ENOMEM); 264 if (!(inode->i_state & I_NEW)) 265 return inode; 266 267 f = JFFS2_INODE_INFO(inode); 268 c = JFFS2_SB_INFO(inode->i_sb); 269 270 jffs2_init_inode_info(f); 271 mutex_lock(&f->sem); 272 273 ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); 274 275 if (ret) { 276 mutex_unlock(&f->sem); 277 iget_failed(inode); 278 return ERR_PTR(ret); 279 } 280 inode->i_mode = jemode_to_cpu(latest_node.mode); 281 i_uid_write(inode, je16_to_cpu(latest_node.uid)); 282 i_gid_write(inode, je16_to_cpu(latest_node.gid)); 283 inode->i_size = je32_to_cpu(latest_node.isize); 284 inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); 285 inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); 286 inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); 287 288 set_nlink(inode, f->inocache->pino_nlink); 289 290 inode->i_blocks = (inode->i_size + 511) >> 9; 291 292 switch (inode->i_mode & S_IFMT) { 293 294 case S_IFLNK: 295 inode->i_op = &jffs2_symlink_inode_operations; 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 jffs2_do_clear_inode(c, f); 366 iget_failed(inode); 367 return ERR_PTR(ret); 368 } 369 370 void jffs2_dirty_inode(struct inode *inode, int flags) 371 { 372 struct iattr iattr; 373 374 if (!(inode->i_state & I_DIRTY_DATASYNC)) { 375 jffs2_dbg(2, "%s(): not calling setattr() for ino #%lu\n", 376 __func__, inode->i_ino); 377 return; 378 } 379 380 jffs2_dbg(1, "%s(): calling setattr() for ino #%lu\n", 381 __func__, inode->i_ino); 382 383 iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; 384 iattr.ia_mode = inode->i_mode; 385 iattr.ia_uid = inode->i_uid; 386 iattr.ia_gid = inode->i_gid; 387 iattr.ia_atime = inode->i_atime; 388 iattr.ia_mtime = inode->i_mtime; 389 iattr.ia_ctime = inode->i_ctime; 390 391 jffs2_do_setattr(inode, &iattr); 392 } 393 394 int jffs2_do_remount_fs(struct super_block *sb, int *flags, char *data) 395 { 396 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); 397 398 if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY)) 399 return -EROFS; 400 401 /* We stop if it was running, then restart if it needs to. 402 This also catches the case where it was stopped and this 403 is just a remount to restart it. 404 Flush the writebuffer, if neccecary, else we loose it */ 405 if (!(sb->s_flags & MS_RDONLY)) { 406 jffs2_stop_garbage_collect_thread(c); 407 mutex_lock(&c->alloc_sem); 408 jffs2_flush_wbuf_pad(c); 409 mutex_unlock(&c->alloc_sem); 410 } 411 412 if (!(*flags & MS_RDONLY)) 413 jffs2_start_garbage_collect_thread(c); 414 415 *flags |= MS_NOATIME; 416 return 0; 417 } 418 419 /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, 420 fill in the raw_inode while you're at it. */ 421 struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_raw_inode *ri) 422 { 423 struct inode *inode; 424 struct super_block *sb = dir_i->i_sb; 425 struct jffs2_sb_info *c; 426 struct jffs2_inode_info *f; 427 int ret; 428 429 jffs2_dbg(1, "%s(): dir_i %ld, mode 0x%x\n", 430 __func__, dir_i->i_ino, mode); 431 432 c = JFFS2_SB_INFO(sb); 433 434 inode = new_inode(sb); 435 436 if (!inode) 437 return ERR_PTR(-ENOMEM); 438 439 f = JFFS2_INODE_INFO(inode); 440 jffs2_init_inode_info(f); 441 mutex_lock(&f->sem); 442 443 memset(ri, 0, sizeof(*ri)); 444 /* Set OS-specific defaults for new inodes */ 445 ri->uid = cpu_to_je16(from_kuid(&init_user_ns, current_fsuid())); 446 447 if (dir_i->i_mode & S_ISGID) { 448 ri->gid = cpu_to_je16(i_gid_read(dir_i)); 449 if (S_ISDIR(mode)) 450 mode |= S_ISGID; 451 } else { 452 ri->gid = cpu_to_je16(from_kgid(&init_user_ns, current_fsgid())); 453 } 454 455 /* POSIX ACLs have to be processed now, at least partly. 456 The umask is only applied if there's no default ACL */ 457 ret = jffs2_init_acl_pre(dir_i, inode, &mode); 458 if (ret) { 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 make_bad_inode(inode); 466 iput(inode); 467 return ERR_PTR(ret); 468 } 469 set_nlink(inode, 1); 470 inode->i_ino = je32_to_cpu(ri->ino); 471 inode->i_mode = jemode_to_cpu(ri->mode); 472 i_gid_write(inode, je16_to_cpu(ri->gid)); 473 i_uid_write(inode, je16_to_cpu(ri->uid)); 474 inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; 475 ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); 476 477 inode->i_blocks = 0; 478 inode->i_size = 0; 479 480 if (insert_inode_locked(inode) < 0) { 481 make_bad_inode(inode); 482 iput(inode); 483 return ERR_PTR(-EINVAL); 484 } 485 486 return inode; 487 } 488 489 static int calculate_inocache_hashsize(uint32_t flash_size) 490 { 491 /* 492 * Pick a inocache hash size based on the size of the medium. 493 * Count how many megabytes we're dealing with, apply a hashsize twice 494 * that size, but rounding down to the usual big powers of 2. And keep 495 * to sensible bounds. 496 */ 497 498 int size_mb = flash_size / 1024 / 1024; 499 int hashsize = (size_mb * 2) & ~0x3f; 500 501 if (hashsize < INOCACHE_HASHSIZE_MIN) 502 return INOCACHE_HASHSIZE_MIN; 503 if (hashsize > INOCACHE_HASHSIZE_MAX) 504 return INOCACHE_HASHSIZE_MAX; 505 506 return hashsize; 507 } 508 509 int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) 510 { 511 struct jffs2_sb_info *c; 512 struct inode *root_i; 513 int ret; 514 size_t blocks; 515 516 c = JFFS2_SB_INFO(sb); 517 518 /* Do not support the MLC nand */ 519 if (c->mtd->type == MTD_MLCNANDFLASH) 520 return -EINVAL; 521 522 #ifndef CONFIG_JFFS2_FS_WRITEBUFFER 523 if (c->mtd->type == MTD_NANDFLASH) { 524 pr_err("Cannot operate on NAND flash unless jffs2 NAND support is compiled in\n"); 525 return -EINVAL; 526 } 527 if (c->mtd->type == MTD_DATAFLASH) { 528 pr_err("Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in\n"); 529 return -EINVAL; 530 } 531 #endif 532 533 c->flash_size = c->mtd->size; 534 c->sector_size = c->mtd->erasesize; 535 blocks = c->flash_size / c->sector_size; 536 537 /* 538 * Size alignment check 539 */ 540 if ((c->sector_size * blocks) != c->flash_size) { 541 c->flash_size = c->sector_size * blocks; 542 pr_info("Flash size not aligned to erasesize, reducing to %dKiB\n", 543 c->flash_size / 1024); 544 } 545 546 if (c->flash_size < 5*c->sector_size) { 547 pr_err("Too few erase blocks (%d)\n", 548 c->flash_size / c->sector_size); 549 return -EINVAL; 550 } 551 552 c->cleanmarker_size = sizeof(struct jffs2_unknown_node); 553 554 /* NAND (or other bizarre) flash... do setup accordingly */ 555 ret = jffs2_flash_setup(c); 556 if (ret) 557 return ret; 558 559 c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size); 560 c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); 561 if (!c->inocache_list) { 562 ret = -ENOMEM; 563 goto out_wbuf; 564 } 565 566 jffs2_init_xattr_subsystem(c); 567 568 if ((ret = jffs2_do_mount_fs(c))) 569 goto out_inohash; 570 571 jffs2_dbg(1, "%s(): Getting root inode\n", __func__); 572 root_i = jffs2_iget(sb, 1); 573 if (IS_ERR(root_i)) { 574 jffs2_dbg(1, "get root inode failed\n"); 575 ret = PTR_ERR(root_i); 576 goto out_root; 577 } 578 579 ret = -ENOMEM; 580 581 jffs2_dbg(1, "%s(): d_make_root()\n", __func__); 582 sb->s_root = d_make_root(root_i); 583 if (!sb->s_root) 584 goto out_root; 585 586 sb->s_maxbytes = 0xFFFFFFFF; 587 sb->s_blocksize = PAGE_CACHE_SIZE; 588 sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 589 sb->s_magic = JFFS2_SUPER_MAGIC; 590 if (!(sb->s_flags & MS_RDONLY)) 591 jffs2_start_garbage_collect_thread(c); 592 return 0; 593 594 out_root: 595 jffs2_free_ino_caches(c); 596 jffs2_free_raw_node_refs(c); 597 if (jffs2_blocks_use_vmalloc(c)) 598 vfree(c->blocks); 599 else 600 kfree(c->blocks); 601 out_inohash: 602 jffs2_clear_xattr_subsystem(c); 603 kfree(c->inocache_list); 604 out_wbuf: 605 jffs2_flash_cleanup(c); 606 607 return ret; 608 } 609 610 void jffs2_gc_release_inode(struct jffs2_sb_info *c, 611 struct jffs2_inode_info *f) 612 { 613 iput(OFNI_EDONI_2SFFJ(f)); 614 } 615 616 struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, 617 int inum, int unlinked) 618 { 619 struct inode *inode; 620 struct jffs2_inode_cache *ic; 621 622 if (unlinked) { 623 /* The inode has zero nlink but its nodes weren't yet marked 624 obsolete. This has to be because we're still waiting for 625 the final (close() and) iput() to happen. 626 627 There's a possibility that the final iput() could have 628 happened while we were contemplating. In order to ensure 629 that we don't cause a new read_inode() (which would fail) 630 for the inode in question, we use ilookup() in this case 631 instead of iget(). 632 633 The nlink can't _become_ zero at this point because we're 634 holding the alloc_sem, and jffs2_do_unlink() would also 635 need that while decrementing nlink on any inode. 636 */ 637 inode = ilookup(OFNI_BS_2SFFJ(c), inum); 638 if (!inode) { 639 jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted.\n", 640 inum); 641 642 spin_lock(&c->inocache_lock); 643 ic = jffs2_get_ino_cache(c, inum); 644 if (!ic) { 645 jffs2_dbg(1, "Inode cache for ino #%u is gone\n", 646 inum); 647 spin_unlock(&c->inocache_lock); 648 return NULL; 649 } 650 if (ic->state != INO_STATE_CHECKEDABSENT) { 651 /* Wait for progress. Don't just loop */ 652 jffs2_dbg(1, "Waiting for ino #%u in state %d\n", 653 ic->ino, ic->state); 654 sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); 655 } else { 656 spin_unlock(&c->inocache_lock); 657 } 658 659 return NULL; 660 } 661 } else { 662 /* Inode has links to it still; they're not going away because 663 jffs2_do_unlink() would need the alloc_sem and we have it. 664 Just iget() it, and if read_inode() is necessary that's OK. 665 */ 666 inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum); 667 if (IS_ERR(inode)) 668 return ERR_CAST(inode); 669 } 670 if (is_bad_inode(inode)) { 671 pr_notice("Eep. read_inode() failed for ino #%u. unlinked %d\n", 672 inum, unlinked); 673 /* NB. This will happen again. We need to do something appropriate here. */ 674 iput(inode); 675 return ERR_PTR(-EIO); 676 } 677 678 return JFFS2_INODE_INFO(inode); 679 } 680 681 unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, 682 struct jffs2_inode_info *f, 683 unsigned long offset, 684 unsigned long *priv) 685 { 686 struct inode *inode = OFNI_EDONI_2SFFJ(f); 687 struct page *pg; 688 689 pg = read_cache_page_async(inode->i_mapping, offset >> PAGE_CACHE_SHIFT, 690 (void *)jffs2_do_readpage_unlock, inode); 691 if (IS_ERR(pg)) 692 return (void *)pg; 693 694 *priv = (unsigned long)pg; 695 return kmap(pg); 696 } 697 698 void jffs2_gc_release_page(struct jffs2_sb_info *c, 699 unsigned char *ptr, 700 unsigned long *priv) 701 { 702 struct page *pg = (void *)*priv; 703 704 kunmap(pg); 705 page_cache_release(pg); 706 } 707 708 static int jffs2_flash_setup(struct jffs2_sb_info *c) { 709 int ret = 0; 710 711 if (jffs2_cleanmarker_oob(c)) { 712 /* NAND flash... do setup accordingly */ 713 ret = jffs2_nand_flash_setup(c); 714 if (ret) 715 return ret; 716 } 717 718 /* and Dataflash */ 719 if (jffs2_dataflash(c)) { 720 ret = jffs2_dataflash_setup(c); 721 if (ret) 722 return ret; 723 } 724 725 /* and Intel "Sibley" flash */ 726 if (jffs2_nor_wbuf_flash(c)) { 727 ret = jffs2_nor_wbuf_flash_setup(c); 728 if (ret) 729 return ret; 730 } 731 732 /* and an UBI volume */ 733 if (jffs2_ubivol(c)) { 734 ret = jffs2_ubivol_setup(c); 735 if (ret) 736 return ret; 737 } 738 739 return ret; 740 } 741 742 void jffs2_flash_cleanup(struct jffs2_sb_info *c) { 743 744 if (jffs2_cleanmarker_oob(c)) { 745 jffs2_nand_flash_cleanup(c); 746 } 747 748 /* and DataFlash */ 749 if (jffs2_dataflash(c)) { 750 jffs2_dataflash_cleanup(c); 751 } 752 753 /* and Intel "Sibley" flash */ 754 if (jffs2_nor_wbuf_flash(c)) { 755 jffs2_nor_wbuf_flash_cleanup(c); 756 } 757 758 /* and an UBI volume */ 759 if (jffs2_ubivol(c)) { 760 jffs2_ubivol_cleanup(c); 761 } 762 } 763