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 #include <linux/capability.h> 14 #include <linux/kernel.h> 15 #include <linux/sched.h> 16 #include <linux/fs.h> 17 #include <linux/list.h> 18 #include <linux/mtd/mtd.h> 19 #include <linux/pagemap.h> 20 #include <linux/slab.h> 21 #include <linux/vmalloc.h> 22 #include <linux/vfs.h> 23 #include <linux/crc32.h> 24 #include "nodelist.h" 25 26 static int jffs2_flash_setup(struct jffs2_sb_info *c); 27 28 int jffs2_do_setattr (struct inode *inode, struct iattr *iattr) 29 { 30 struct jffs2_full_dnode *old_metadata, *new_metadata; 31 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 32 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 33 struct jffs2_raw_inode *ri; 34 union jffs2_device_node dev; 35 unsigned char *mdata = NULL; 36 int mdatalen = 0; 37 unsigned int ivalid; 38 uint32_t alloclen; 39 int ret; 40 int alloc_type = ALLOC_NORMAL; 41 42 D1(printk(KERN_DEBUG "jffs2_setattr(): ino #%lu\n", inode->i_ino)); 43 44 /* Special cases - we don't want more than one data node 45 for these types on the medium at any time. So setattr 46 must read the original data associated with the node 47 (i.e. the device numbers or the target name) and write 48 it out again with the appropriate data attached */ 49 if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) { 50 /* For these, we don't actually need to read the old node */ 51 mdatalen = jffs2_encode_dev(&dev, inode->i_rdev); 52 mdata = (char *)&dev; 53 D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t\n", mdatalen)); 54 } else if (S_ISLNK(inode->i_mode)) { 55 mutex_lock(&f->sem); 56 mdatalen = f->metadata->size; 57 mdata = kmalloc(f->metadata->size, GFP_USER); 58 if (!mdata) { 59 mutex_unlock(&f->sem); 60 return -ENOMEM; 61 } 62 ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen); 63 if (ret) { 64 mutex_unlock(&f->sem); 65 kfree(mdata); 66 return ret; 67 } 68 mutex_unlock(&f->sem); 69 D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of symlink target\n", mdatalen)); 70 } 71 72 ri = jffs2_alloc_raw_inode(); 73 if (!ri) { 74 if (S_ISLNK(inode->i_mode)) 75 kfree(mdata); 76 return -ENOMEM; 77 } 78 79 ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen, 80 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 81 if (ret) { 82 jffs2_free_raw_inode(ri); 83 if (S_ISLNK(inode->i_mode & S_IFMT)) 84 kfree(mdata); 85 return ret; 86 } 87 mutex_lock(&f->sem); 88 ivalid = iattr->ia_valid; 89 90 ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 91 ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); 92 ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen); 93 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 94 95 ri->ino = cpu_to_je32(inode->i_ino); 96 ri->version = cpu_to_je32(++f->highest_version); 97 98 ri->uid = cpu_to_je16((ivalid & ATTR_UID)?iattr->ia_uid:inode->i_uid); 99 ri->gid = cpu_to_je16((ivalid & ATTR_GID)?iattr->ia_gid:inode->i_gid); 100 101 if (ivalid & ATTR_MODE) 102 ri->mode = cpu_to_jemode(iattr->ia_mode); 103 else 104 ri->mode = cpu_to_jemode(inode->i_mode); 105 106 107 ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size); 108 ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime)); 109 ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime)); 110 ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime)); 111 112 ri->offset = cpu_to_je32(0); 113 ri->csize = ri->dsize = cpu_to_je32(mdatalen); 114 ri->compr = JFFS2_COMPR_NONE; 115 if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { 116 /* It's an extension. Make it a hole node */ 117 ri->compr = JFFS2_COMPR_ZERO; 118 ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size); 119 ri->offset = cpu_to_je32(inode->i_size); 120 } else if (ivalid & ATTR_SIZE && !iattr->ia_size) { 121 /* For truncate-to-zero, treat it as deletion because 122 it'll always be obsoleting all previous nodes */ 123 alloc_type = ALLOC_DELETION; 124 } 125 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 126 if (mdatalen) 127 ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen)); 128 else 129 ri->data_crc = cpu_to_je32(0); 130 131 new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type); 132 if (S_ISLNK(inode->i_mode)) 133 kfree(mdata); 134 135 if (IS_ERR(new_metadata)) { 136 jffs2_complete_reservation(c); 137 jffs2_free_raw_inode(ri); 138 mutex_unlock(&f->sem); 139 return PTR_ERR(new_metadata); 140 } 141 /* It worked. Update the inode */ 142 inode->i_atime = ITIME(je32_to_cpu(ri->atime)); 143 inode->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 144 inode->i_mtime = ITIME(je32_to_cpu(ri->mtime)); 145 inode->i_mode = jemode_to_cpu(ri->mode); 146 inode->i_uid = je16_to_cpu(ri->uid); 147 inode->i_gid = je16_to_cpu(ri->gid); 148 149 150 old_metadata = f->metadata; 151 152 if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) 153 jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); 154 155 if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { 156 jffs2_add_full_dnode_to_inode(c, f, new_metadata); 157 inode->i_size = iattr->ia_size; 158 inode->i_blocks = (inode->i_size + 511) >> 9; 159 f->metadata = NULL; 160 } else { 161 f->metadata = new_metadata; 162 } 163 if (old_metadata) { 164 jffs2_mark_node_obsolete(c, old_metadata->raw); 165 jffs2_free_full_dnode(old_metadata); 166 } 167 jffs2_free_raw_inode(ri); 168 169 mutex_unlock(&f->sem); 170 jffs2_complete_reservation(c); 171 172 /* We have to do the truncate_setsize() without f->sem held, since 173 some pages may be locked and waiting for it in readpage(). 174 We are protected from a simultaneous write() extending i_size 175 back past iattr->ia_size, because do_truncate() holds the 176 generic inode semaphore. */ 177 if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) { 178 truncate_setsize(inode, iattr->ia_size); 179 inode->i_blocks = (inode->i_size + 511) >> 9; 180 } 181 182 return 0; 183 } 184 185 int jffs2_setattr(struct dentry *dentry, struct iattr *iattr) 186 { 187 int rc; 188 189 rc = inode_change_ok(dentry->d_inode, iattr); 190 if (rc) 191 return rc; 192 193 rc = jffs2_do_setattr(dentry->d_inode, iattr); 194 if (!rc && (iattr->ia_valid & ATTR_MODE)) 195 rc = jffs2_acl_chmod(dentry->d_inode); 196 197 return rc; 198 } 199 200 int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf) 201 { 202 struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb); 203 unsigned long avail; 204 205 buf->f_type = JFFS2_SUPER_MAGIC; 206 buf->f_bsize = 1 << PAGE_SHIFT; 207 buf->f_blocks = c->flash_size >> PAGE_SHIFT; 208 buf->f_files = 0; 209 buf->f_ffree = 0; 210 buf->f_namelen = JFFS2_MAX_NAME_LEN; 211 buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC; 212 buf->f_fsid.val[1] = c->mtd->index; 213 214 spin_lock(&c->erase_completion_lock); 215 avail = c->dirty_size + c->free_size; 216 if (avail > c->sector_size * c->resv_blocks_write) 217 avail -= c->sector_size * c->resv_blocks_write; 218 else 219 avail = 0; 220 spin_unlock(&c->erase_completion_lock); 221 222 buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; 223 224 return 0; 225 } 226 227 228 void jffs2_evict_inode (struct inode *inode) 229 { 230 /* We can forget about this inode for now - drop all 231 * the nodelists associated with it, etc. 232 */ 233 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 234 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 235 236 D1(printk(KERN_DEBUG "jffs2_evict_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode)); 237 truncate_inode_pages(&inode->i_data, 0); 238 end_writeback(inode); 239 jffs2_do_clear_inode(c, f); 240 } 241 242 struct inode *jffs2_iget(struct super_block *sb, unsigned long ino) 243 { 244 struct jffs2_inode_info *f; 245 struct jffs2_sb_info *c; 246 struct jffs2_raw_inode latest_node; 247 union jffs2_device_node jdev; 248 struct inode *inode; 249 dev_t rdev = 0; 250 int ret; 251 252 D1(printk(KERN_DEBUG "jffs2_iget(): ino == %lu\n", ino)); 253 254 inode = iget_locked(sb, ino); 255 if (!inode) 256 return ERR_PTR(-ENOMEM); 257 if (!(inode->i_state & I_NEW)) 258 return inode; 259 260 f = JFFS2_INODE_INFO(inode); 261 c = JFFS2_SB_INFO(inode->i_sb); 262 263 jffs2_init_inode_info(f); 264 mutex_lock(&f->sem); 265 266 ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); 267 268 if (ret) { 269 mutex_unlock(&f->sem); 270 iget_failed(inode); 271 return ERR_PTR(ret); 272 } 273 inode->i_mode = jemode_to_cpu(latest_node.mode); 274 inode->i_uid = je16_to_cpu(latest_node.uid); 275 inode->i_gid = je16_to_cpu(latest_node.gid); 276 inode->i_size = je32_to_cpu(latest_node.isize); 277 inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); 278 inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); 279 inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); 280 281 inode->i_nlink = f->inocache->pino_nlink; 282 283 inode->i_blocks = (inode->i_size + 511) >> 9; 284 285 switch (inode->i_mode & S_IFMT) { 286 287 case S_IFLNK: 288 inode->i_op = &jffs2_symlink_inode_operations; 289 break; 290 291 case S_IFDIR: 292 { 293 struct jffs2_full_dirent *fd; 294 inode->i_nlink = 2; /* parent and '.' */ 295 296 for (fd=f->dents; fd; fd = fd->next) { 297 if (fd->type == DT_DIR && fd->ino) 298 inc_nlink(inode); 299 } 300 /* Root dir gets i_nlink 3 for some reason */ 301 if (inode->i_ino == 1) 302 inc_nlink(inode); 303 304 inode->i_op = &jffs2_dir_inode_operations; 305 inode->i_fop = &jffs2_dir_operations; 306 break; 307 } 308 case S_IFREG: 309 inode->i_op = &jffs2_file_inode_operations; 310 inode->i_fop = &jffs2_file_operations; 311 inode->i_mapping->a_ops = &jffs2_file_address_operations; 312 inode->i_mapping->nrpages = 0; 313 break; 314 315 case S_IFBLK: 316 case S_IFCHR: 317 /* Read the device numbers from the media */ 318 if (f->metadata->size != sizeof(jdev.old_id) && 319 f->metadata->size != sizeof(jdev.new_id)) { 320 printk(KERN_NOTICE "Device node has strange size %d\n", f->metadata->size); 321 goto error_io; 322 } 323 D1(printk(KERN_DEBUG "Reading device numbers from flash\n")); 324 ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size); 325 if (ret < 0) { 326 /* Eep */ 327 printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino); 328 goto error; 329 } 330 if (f->metadata->size == sizeof(jdev.old_id)) 331 rdev = old_decode_dev(je16_to_cpu(jdev.old_id)); 332 else 333 rdev = new_decode_dev(je32_to_cpu(jdev.new_id)); 334 335 case S_IFSOCK: 336 case S_IFIFO: 337 inode->i_op = &jffs2_file_inode_operations; 338 init_special_inode(inode, inode->i_mode, rdev); 339 break; 340 341 default: 342 printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu\n", inode->i_mode, (unsigned long)inode->i_ino); 343 } 344 345 mutex_unlock(&f->sem); 346 347 D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n")); 348 unlock_new_inode(inode); 349 return inode; 350 351 error_io: 352 ret = -EIO; 353 error: 354 mutex_unlock(&f->sem); 355 jffs2_do_clear_inode(c, f); 356 iget_failed(inode); 357 return ERR_PTR(ret); 358 } 359 360 void jffs2_dirty_inode(struct inode *inode) 361 { 362 struct iattr iattr; 363 364 if (!(inode->i_state & I_DIRTY_DATASYNC)) { 365 D2(printk(KERN_DEBUG "jffs2_dirty_inode() not calling setattr() for ino #%lu\n", inode->i_ino)); 366 return; 367 } 368 369 D1(printk(KERN_DEBUG "jffs2_dirty_inode() calling setattr() for ino #%lu\n", inode->i_ino)); 370 371 iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; 372 iattr.ia_mode = inode->i_mode; 373 iattr.ia_uid = inode->i_uid; 374 iattr.ia_gid = inode->i_gid; 375 iattr.ia_atime = inode->i_atime; 376 iattr.ia_mtime = inode->i_mtime; 377 iattr.ia_ctime = inode->i_ctime; 378 379 jffs2_do_setattr(inode, &iattr); 380 } 381 382 int jffs2_remount_fs (struct super_block *sb, int *flags, char *data) 383 { 384 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); 385 386 if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY)) 387 return -EROFS; 388 389 /* We stop if it was running, then restart if it needs to. 390 This also catches the case where it was stopped and this 391 is just a remount to restart it. 392 Flush the writebuffer, if neccecary, else we loose it */ 393 if (!(sb->s_flags & MS_RDONLY)) { 394 jffs2_stop_garbage_collect_thread(c); 395 mutex_lock(&c->alloc_sem); 396 jffs2_flush_wbuf_pad(c); 397 mutex_unlock(&c->alloc_sem); 398 } 399 400 if (!(*flags & MS_RDONLY)) 401 jffs2_start_garbage_collect_thread(c); 402 403 *flags |= MS_NOATIME; 404 return 0; 405 } 406 407 /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, 408 fill in the raw_inode while you're at it. */ 409 struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_inode *ri) 410 { 411 struct inode *inode; 412 struct super_block *sb = dir_i->i_sb; 413 struct jffs2_sb_info *c; 414 struct jffs2_inode_info *f; 415 int ret; 416 417 D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x\n", dir_i->i_ino, mode)); 418 419 c = JFFS2_SB_INFO(sb); 420 421 inode = new_inode(sb); 422 423 if (!inode) 424 return ERR_PTR(-ENOMEM); 425 426 f = JFFS2_INODE_INFO(inode); 427 jffs2_init_inode_info(f); 428 mutex_lock(&f->sem); 429 430 memset(ri, 0, sizeof(*ri)); 431 /* Set OS-specific defaults for new inodes */ 432 ri->uid = cpu_to_je16(current_fsuid()); 433 434 if (dir_i->i_mode & S_ISGID) { 435 ri->gid = cpu_to_je16(dir_i->i_gid); 436 if (S_ISDIR(mode)) 437 mode |= S_ISGID; 438 } else { 439 ri->gid = cpu_to_je16(current_fsgid()); 440 } 441 442 /* POSIX ACLs have to be processed now, at least partly. 443 The umask is only applied if there's no default ACL */ 444 ret = jffs2_init_acl_pre(dir_i, inode, &mode); 445 if (ret) { 446 make_bad_inode(inode); 447 iput(inode); 448 return ERR_PTR(ret); 449 } 450 ret = jffs2_do_new_inode (c, f, mode, ri); 451 if (ret) { 452 make_bad_inode(inode); 453 iput(inode); 454 return ERR_PTR(ret); 455 } 456 inode->i_nlink = 1; 457 inode->i_ino = je32_to_cpu(ri->ino); 458 inode->i_mode = jemode_to_cpu(ri->mode); 459 inode->i_gid = je16_to_cpu(ri->gid); 460 inode->i_uid = je16_to_cpu(ri->uid); 461 inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; 462 ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); 463 464 inode->i_blocks = 0; 465 inode->i_size = 0; 466 467 if (insert_inode_locked(inode) < 0) { 468 make_bad_inode(inode); 469 unlock_new_inode(inode); 470 iput(inode); 471 return ERR_PTR(-EINVAL); 472 } 473 474 return inode; 475 } 476 477 478 int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) 479 { 480 struct jffs2_sb_info *c; 481 struct inode *root_i; 482 int ret; 483 size_t blocks; 484 485 c = JFFS2_SB_INFO(sb); 486 487 #ifndef CONFIG_JFFS2_FS_WRITEBUFFER 488 if (c->mtd->type == MTD_NANDFLASH) { 489 printk(KERN_ERR "jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in.\n"); 490 return -EINVAL; 491 } 492 if (c->mtd->type == MTD_DATAFLASH) { 493 printk(KERN_ERR "jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in.\n"); 494 return -EINVAL; 495 } 496 #endif 497 498 c->flash_size = c->mtd->size; 499 c->sector_size = c->mtd->erasesize; 500 blocks = c->flash_size / c->sector_size; 501 502 /* 503 * Size alignment check 504 */ 505 if ((c->sector_size * blocks) != c->flash_size) { 506 c->flash_size = c->sector_size * blocks; 507 printk(KERN_INFO "jffs2: Flash size not aligned to erasesize, reducing to %dKiB\n", 508 c->flash_size / 1024); 509 } 510 511 if (c->flash_size < 5*c->sector_size) { 512 printk(KERN_ERR "jffs2: Too few erase blocks (%d)\n", c->flash_size / c->sector_size); 513 return -EINVAL; 514 } 515 516 c->cleanmarker_size = sizeof(struct jffs2_unknown_node); 517 518 /* NAND (or other bizarre) flash... do setup accordingly */ 519 ret = jffs2_flash_setup(c); 520 if (ret) 521 return ret; 522 523 c->inocache_list = kcalloc(INOCACHE_HASHSIZE, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); 524 if (!c->inocache_list) { 525 ret = -ENOMEM; 526 goto out_wbuf; 527 } 528 529 jffs2_init_xattr_subsystem(c); 530 531 if ((ret = jffs2_do_mount_fs(c))) 532 goto out_inohash; 533 534 D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n")); 535 root_i = jffs2_iget(sb, 1); 536 if (IS_ERR(root_i)) { 537 D1(printk(KERN_WARNING "get root inode failed\n")); 538 ret = PTR_ERR(root_i); 539 goto out_root; 540 } 541 542 ret = -ENOMEM; 543 544 D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n")); 545 sb->s_root = d_alloc_root(root_i); 546 if (!sb->s_root) 547 goto out_root_i; 548 549 sb->s_maxbytes = 0xFFFFFFFF; 550 sb->s_blocksize = PAGE_CACHE_SIZE; 551 sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 552 sb->s_magic = JFFS2_SUPER_MAGIC; 553 if (!(sb->s_flags & MS_RDONLY)) 554 jffs2_start_garbage_collect_thread(c); 555 return 0; 556 557 out_root_i: 558 iput(root_i); 559 out_root: 560 jffs2_free_ino_caches(c); 561 jffs2_free_raw_node_refs(c); 562 if (jffs2_blocks_use_vmalloc(c)) 563 vfree(c->blocks); 564 else 565 kfree(c->blocks); 566 out_inohash: 567 jffs2_clear_xattr_subsystem(c); 568 kfree(c->inocache_list); 569 out_wbuf: 570 jffs2_flash_cleanup(c); 571 572 return ret; 573 } 574 575 void jffs2_gc_release_inode(struct jffs2_sb_info *c, 576 struct jffs2_inode_info *f) 577 { 578 iput(OFNI_EDONI_2SFFJ(f)); 579 } 580 581 struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, 582 int inum, int unlinked) 583 { 584 struct inode *inode; 585 struct jffs2_inode_cache *ic; 586 587 if (unlinked) { 588 /* The inode has zero nlink but its nodes weren't yet marked 589 obsolete. This has to be because we're still waiting for 590 the final (close() and) iput() to happen. 591 592 There's a possibility that the final iput() could have 593 happened while we were contemplating. In order to ensure 594 that we don't cause a new read_inode() (which would fail) 595 for the inode in question, we use ilookup() in this case 596 instead of iget(). 597 598 The nlink can't _become_ zero at this point because we're 599 holding the alloc_sem, and jffs2_do_unlink() would also 600 need that while decrementing nlink on any inode. 601 */ 602 inode = ilookup(OFNI_BS_2SFFJ(c), inum); 603 if (!inode) { 604 D1(printk(KERN_DEBUG "ilookup() failed for ino #%u; inode is probably deleted.\n", 605 inum)); 606 607 spin_lock(&c->inocache_lock); 608 ic = jffs2_get_ino_cache(c, inum); 609 if (!ic) { 610 D1(printk(KERN_DEBUG "Inode cache for ino #%u is gone.\n", inum)); 611 spin_unlock(&c->inocache_lock); 612 return NULL; 613 } 614 if (ic->state != INO_STATE_CHECKEDABSENT) { 615 /* Wait for progress. Don't just loop */ 616 D1(printk(KERN_DEBUG "Waiting for ino #%u in state %d\n", 617 ic->ino, ic->state)); 618 sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); 619 } else { 620 spin_unlock(&c->inocache_lock); 621 } 622 623 return NULL; 624 } 625 } else { 626 /* Inode has links to it still; they're not going away because 627 jffs2_do_unlink() would need the alloc_sem and we have it. 628 Just iget() it, and if read_inode() is necessary that's OK. 629 */ 630 inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum); 631 if (IS_ERR(inode)) 632 return ERR_CAST(inode); 633 } 634 if (is_bad_inode(inode)) { 635 printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. unlinked %d\n", 636 inum, unlinked); 637 /* NB. This will happen again. We need to do something appropriate here. */ 638 iput(inode); 639 return ERR_PTR(-EIO); 640 } 641 642 return JFFS2_INODE_INFO(inode); 643 } 644 645 unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, 646 struct jffs2_inode_info *f, 647 unsigned long offset, 648 unsigned long *priv) 649 { 650 struct inode *inode = OFNI_EDONI_2SFFJ(f); 651 struct page *pg; 652 653 pg = read_cache_page_async(inode->i_mapping, offset >> PAGE_CACHE_SHIFT, 654 (void *)jffs2_do_readpage_unlock, inode); 655 if (IS_ERR(pg)) 656 return (void *)pg; 657 658 *priv = (unsigned long)pg; 659 return kmap(pg); 660 } 661 662 void jffs2_gc_release_page(struct jffs2_sb_info *c, 663 unsigned char *ptr, 664 unsigned long *priv) 665 { 666 struct page *pg = (void *)*priv; 667 668 kunmap(pg); 669 page_cache_release(pg); 670 } 671 672 static int jffs2_flash_setup(struct jffs2_sb_info *c) { 673 int ret = 0; 674 675 if (jffs2_cleanmarker_oob(c)) { 676 /* NAND flash... do setup accordingly */ 677 ret = jffs2_nand_flash_setup(c); 678 if (ret) 679 return ret; 680 } 681 682 /* and Dataflash */ 683 if (jffs2_dataflash(c)) { 684 ret = jffs2_dataflash_setup(c); 685 if (ret) 686 return ret; 687 } 688 689 /* and Intel "Sibley" flash */ 690 if (jffs2_nor_wbuf_flash(c)) { 691 ret = jffs2_nor_wbuf_flash_setup(c); 692 if (ret) 693 return ret; 694 } 695 696 /* and an UBI volume */ 697 if (jffs2_ubivol(c)) { 698 ret = jffs2_ubivol_setup(c); 699 if (ret) 700 return ret; 701 } 702 703 return ret; 704 } 705 706 void jffs2_flash_cleanup(struct jffs2_sb_info *c) { 707 708 if (jffs2_cleanmarker_oob(c)) { 709 jffs2_nand_flash_cleanup(c); 710 } 711 712 /* and DataFlash */ 713 if (jffs2_dataflash(c)) { 714 jffs2_dataflash_cleanup(c); 715 } 716 717 /* and Intel "Sibley" flash */ 718 if (jffs2_nor_wbuf_flash(c)) { 719 jffs2_nor_wbuf_flash_cleanup(c); 720 } 721 722 /* and an UBI volume */ 723 if (jffs2_ubivol(c)) { 724 jffs2_ubivol_cleanup(c); 725 } 726 } 727