1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright © 2001-2007 Red Hat, Inc. 5 * 6 * Created by David Woodhouse <dwmw2@infradead.org> 7 * 8 * For licensing information, see the file 'LICENCE' in this directory. 9 * 10 */ 11 12 #include <linux/capability.h> 13 #include <linux/kernel.h> 14 #include <linux/sched.h> 15 #include <linux/fs.h> 16 #include <linux/list.h> 17 #include <linux/mtd/mtd.h> 18 #include <linux/pagemap.h> 19 #include <linux/slab.h> 20 #include <linux/vmalloc.h> 21 #include <linux/vfs.h> 22 #include <linux/crc32.h> 23 #include <linux/smp_lock.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 vmtruncate() 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 vmtruncate(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_clear_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_clear_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode)); 237 jffs2_do_clear_inode(c, f); 238 } 239 240 struct inode *jffs2_iget(struct super_block *sb, unsigned long ino) 241 { 242 struct jffs2_inode_info *f; 243 struct jffs2_sb_info *c; 244 struct jffs2_raw_inode latest_node; 245 union jffs2_device_node jdev; 246 struct inode *inode; 247 dev_t rdev = 0; 248 int ret; 249 250 D1(printk(KERN_DEBUG "jffs2_iget(): ino == %lu\n", ino)); 251 252 inode = iget_locked(sb, ino); 253 if (!inode) 254 return ERR_PTR(-ENOMEM); 255 if (!(inode->i_state & I_NEW)) 256 return inode; 257 258 f = JFFS2_INODE_INFO(inode); 259 c = JFFS2_SB_INFO(inode->i_sb); 260 261 jffs2_init_inode_info(f); 262 mutex_lock(&f->sem); 263 264 ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); 265 266 if (ret) { 267 mutex_unlock(&f->sem); 268 iget_failed(inode); 269 return ERR_PTR(ret); 270 } 271 inode->i_mode = jemode_to_cpu(latest_node.mode); 272 inode->i_uid = je16_to_cpu(latest_node.uid); 273 inode->i_gid = je16_to_cpu(latest_node.gid); 274 inode->i_size = je32_to_cpu(latest_node.isize); 275 inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); 276 inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); 277 inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); 278 279 inode->i_nlink = f->inocache->pino_nlink; 280 281 inode->i_blocks = (inode->i_size + 511) >> 9; 282 283 switch (inode->i_mode & S_IFMT) { 284 285 case S_IFLNK: 286 inode->i_op = &jffs2_symlink_inode_operations; 287 break; 288 289 case S_IFDIR: 290 { 291 struct jffs2_full_dirent *fd; 292 inode->i_nlink = 2; /* parent and '.' */ 293 294 for (fd=f->dents; fd; fd = fd->next) { 295 if (fd->type == DT_DIR && fd->ino) 296 inc_nlink(inode); 297 } 298 /* Root dir gets i_nlink 3 for some reason */ 299 if (inode->i_ino == 1) 300 inc_nlink(inode); 301 302 inode->i_op = &jffs2_dir_inode_operations; 303 inode->i_fop = &jffs2_dir_operations; 304 break; 305 } 306 case S_IFREG: 307 inode->i_op = &jffs2_file_inode_operations; 308 inode->i_fop = &jffs2_file_operations; 309 inode->i_mapping->a_ops = &jffs2_file_address_operations; 310 inode->i_mapping->nrpages = 0; 311 break; 312 313 case S_IFBLK: 314 case S_IFCHR: 315 /* Read the device numbers from the media */ 316 if (f->metadata->size != sizeof(jdev.old) && 317 f->metadata->size != sizeof(jdev.new)) { 318 printk(KERN_NOTICE "Device node has strange size %d\n", f->metadata->size); 319 goto error_io; 320 } 321 D1(printk(KERN_DEBUG "Reading device numbers from flash\n")); 322 ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size); 323 if (ret < 0) { 324 /* Eep */ 325 printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino); 326 goto error; 327 } 328 if (f->metadata->size == sizeof(jdev.old)) 329 rdev = old_decode_dev(je16_to_cpu(jdev.old)); 330 else 331 rdev = new_decode_dev(je32_to_cpu(jdev.new)); 332 333 case S_IFSOCK: 334 case S_IFIFO: 335 inode->i_op = &jffs2_file_inode_operations; 336 init_special_inode(inode, inode->i_mode, rdev); 337 break; 338 339 default: 340 printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu\n", inode->i_mode, (unsigned long)inode->i_ino); 341 } 342 343 mutex_unlock(&f->sem); 344 345 D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n")); 346 unlock_new_inode(inode); 347 return inode; 348 349 error_io: 350 ret = -EIO; 351 error: 352 mutex_unlock(&f->sem); 353 jffs2_do_clear_inode(c, f); 354 iget_failed(inode); 355 return ERR_PTR(ret); 356 } 357 358 void jffs2_dirty_inode(struct inode *inode) 359 { 360 struct iattr iattr; 361 362 if (!(inode->i_state & I_DIRTY_DATASYNC)) { 363 D2(printk(KERN_DEBUG "jffs2_dirty_inode() not calling setattr() for ino #%lu\n", inode->i_ino)); 364 return; 365 } 366 367 D1(printk(KERN_DEBUG "jffs2_dirty_inode() calling setattr() for ino #%lu\n", inode->i_ino)); 368 369 iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; 370 iattr.ia_mode = inode->i_mode; 371 iattr.ia_uid = inode->i_uid; 372 iattr.ia_gid = inode->i_gid; 373 iattr.ia_atime = inode->i_atime; 374 iattr.ia_mtime = inode->i_mtime; 375 iattr.ia_ctime = inode->i_ctime; 376 377 jffs2_do_setattr(inode, &iattr); 378 } 379 380 int jffs2_remount_fs (struct super_block *sb, int *flags, char *data) 381 { 382 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); 383 384 if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY)) 385 return -EROFS; 386 387 /* We stop if it was running, then restart if it needs to. 388 This also catches the case where it was stopped and this 389 is just a remount to restart it. 390 Flush the writebuffer, if neccecary, else we loose it */ 391 lock_kernel(); 392 if (!(sb->s_flags & MS_RDONLY)) { 393 jffs2_stop_garbage_collect_thread(c); 394 mutex_lock(&c->alloc_sem); 395 jffs2_flush_wbuf_pad(c); 396 mutex_unlock(&c->alloc_sem); 397 } 398 399 if (!(*flags & MS_RDONLY)) 400 jffs2_start_garbage_collect_thread(c); 401 402 *flags |= MS_NOATIME; 403 404 unlock_kernel(); 405 return 0; 406 } 407 408 /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, 409 fill in the raw_inode while you're at it. */ 410 struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_inode *ri) 411 { 412 struct inode *inode; 413 struct super_block *sb = dir_i->i_sb; 414 struct jffs2_sb_info *c; 415 struct jffs2_inode_info *f; 416 int ret; 417 418 D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x\n", dir_i->i_ino, mode)); 419 420 c = JFFS2_SB_INFO(sb); 421 422 inode = new_inode(sb); 423 424 if (!inode) 425 return ERR_PTR(-ENOMEM); 426 427 f = JFFS2_INODE_INFO(inode); 428 jffs2_init_inode_info(f); 429 mutex_lock(&f->sem); 430 431 memset(ri, 0, sizeof(*ri)); 432 /* Set OS-specific defaults for new inodes */ 433 ri->uid = cpu_to_je16(current_fsuid()); 434 435 if (dir_i->i_mode & S_ISGID) { 436 ri->gid = cpu_to_je16(dir_i->i_gid); 437 if (S_ISDIR(mode)) 438 mode |= S_ISGID; 439 } else { 440 ri->gid = cpu_to_je16(current_fsgid()); 441 } 442 443 /* POSIX ACLs have to be processed now, at least partly. 444 The umask is only applied if there's no default ACL */ 445 ret = jffs2_init_acl_pre(dir_i, inode, &mode); 446 if (ret) { 447 make_bad_inode(inode); 448 iput(inode); 449 return ERR_PTR(ret); 450 } 451 ret = jffs2_do_new_inode (c, f, mode, ri); 452 if (ret) { 453 make_bad_inode(inode); 454 iput(inode); 455 return ERR_PTR(ret); 456 } 457 inode->i_nlink = 1; 458 inode->i_ino = je32_to_cpu(ri->ino); 459 inode->i_mode = jemode_to_cpu(ri->mode); 460 inode->i_gid = je16_to_cpu(ri->gid); 461 inode->i_uid = je16_to_cpu(ri->uid); 462 inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; 463 ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); 464 465 inode->i_blocks = 0; 466 inode->i_size = 0; 467 468 insert_inode_hash(inode); 469 470 return inode; 471 } 472 473 474 int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) 475 { 476 struct jffs2_sb_info *c; 477 struct inode *root_i; 478 int ret; 479 size_t blocks; 480 481 c = JFFS2_SB_INFO(sb); 482 483 #ifndef CONFIG_JFFS2_FS_WRITEBUFFER 484 if (c->mtd->type == MTD_NANDFLASH) { 485 printk(KERN_ERR "jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in.\n"); 486 return -EINVAL; 487 } 488 if (c->mtd->type == MTD_DATAFLASH) { 489 printk(KERN_ERR "jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in.\n"); 490 return -EINVAL; 491 } 492 #endif 493 494 c->flash_size = c->mtd->size; 495 c->sector_size = c->mtd->erasesize; 496 blocks = c->flash_size / c->sector_size; 497 498 /* 499 * Size alignment check 500 */ 501 if ((c->sector_size * blocks) != c->flash_size) { 502 c->flash_size = c->sector_size * blocks; 503 printk(KERN_INFO "jffs2: Flash size not aligned to erasesize, reducing to %dKiB\n", 504 c->flash_size / 1024); 505 } 506 507 if (c->flash_size < 5*c->sector_size) { 508 printk(KERN_ERR "jffs2: Too few erase blocks (%d)\n", c->flash_size / c->sector_size); 509 return -EINVAL; 510 } 511 512 c->cleanmarker_size = sizeof(struct jffs2_unknown_node); 513 514 /* NAND (or other bizarre) flash... do setup accordingly */ 515 ret = jffs2_flash_setup(c); 516 if (ret) 517 return ret; 518 519 c->inocache_list = kcalloc(INOCACHE_HASHSIZE, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); 520 if (!c->inocache_list) { 521 ret = -ENOMEM; 522 goto out_wbuf; 523 } 524 525 jffs2_init_xattr_subsystem(c); 526 527 if ((ret = jffs2_do_mount_fs(c))) 528 goto out_inohash; 529 530 D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n")); 531 root_i = jffs2_iget(sb, 1); 532 if (IS_ERR(root_i)) { 533 D1(printk(KERN_WARNING "get root inode failed\n")); 534 ret = PTR_ERR(root_i); 535 goto out_root; 536 } 537 538 ret = -ENOMEM; 539 540 D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n")); 541 sb->s_root = d_alloc_root(root_i); 542 if (!sb->s_root) 543 goto out_root_i; 544 545 sb->s_maxbytes = 0xFFFFFFFF; 546 sb->s_blocksize = PAGE_CACHE_SIZE; 547 sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 548 sb->s_magic = JFFS2_SUPER_MAGIC; 549 if (!(sb->s_flags & MS_RDONLY)) 550 jffs2_start_garbage_collect_thread(c); 551 return 0; 552 553 out_root_i: 554 iput(root_i); 555 out_root: 556 jffs2_free_ino_caches(c); 557 jffs2_free_raw_node_refs(c); 558 if (jffs2_blocks_use_vmalloc(c)) 559 vfree(c->blocks); 560 else 561 kfree(c->blocks); 562 out_inohash: 563 jffs2_clear_xattr_subsystem(c); 564 kfree(c->inocache_list); 565 out_wbuf: 566 jffs2_flash_cleanup(c); 567 568 return ret; 569 } 570 571 void jffs2_gc_release_inode(struct jffs2_sb_info *c, 572 struct jffs2_inode_info *f) 573 { 574 iput(OFNI_EDONI_2SFFJ(f)); 575 } 576 577 struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, 578 int inum, int unlinked) 579 { 580 struct inode *inode; 581 struct jffs2_inode_cache *ic; 582 583 if (unlinked) { 584 /* The inode has zero nlink but its nodes weren't yet marked 585 obsolete. This has to be because we're still waiting for 586 the final (close() and) iput() to happen. 587 588 There's a possibility that the final iput() could have 589 happened while we were contemplating. In order to ensure 590 that we don't cause a new read_inode() (which would fail) 591 for the inode in question, we use ilookup() in this case 592 instead of iget(). 593 594 The nlink can't _become_ zero at this point because we're 595 holding the alloc_sem, and jffs2_do_unlink() would also 596 need that while decrementing nlink on any inode. 597 */ 598 inode = ilookup(OFNI_BS_2SFFJ(c), inum); 599 if (!inode) { 600 D1(printk(KERN_DEBUG "ilookup() failed for ino #%u; inode is probably deleted.\n", 601 inum)); 602 603 spin_lock(&c->inocache_lock); 604 ic = jffs2_get_ino_cache(c, inum); 605 if (!ic) { 606 D1(printk(KERN_DEBUG "Inode cache for ino #%u is gone.\n", inum)); 607 spin_unlock(&c->inocache_lock); 608 return NULL; 609 } 610 if (ic->state != INO_STATE_CHECKEDABSENT) { 611 /* Wait for progress. Don't just loop */ 612 D1(printk(KERN_DEBUG "Waiting for ino #%u in state %d\n", 613 ic->ino, ic->state)); 614 sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); 615 } else { 616 spin_unlock(&c->inocache_lock); 617 } 618 619 return NULL; 620 } 621 } else { 622 /* Inode has links to it still; they're not going away because 623 jffs2_do_unlink() would need the alloc_sem and we have it. 624 Just iget() it, and if read_inode() is necessary that's OK. 625 */ 626 inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum); 627 if (IS_ERR(inode)) 628 return ERR_CAST(inode); 629 } 630 if (is_bad_inode(inode)) { 631 printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. unlinked %d\n", 632 inum, unlinked); 633 /* NB. This will happen again. We need to do something appropriate here. */ 634 iput(inode); 635 return ERR_PTR(-EIO); 636 } 637 638 return JFFS2_INODE_INFO(inode); 639 } 640 641 unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, 642 struct jffs2_inode_info *f, 643 unsigned long offset, 644 unsigned long *priv) 645 { 646 struct inode *inode = OFNI_EDONI_2SFFJ(f); 647 struct page *pg; 648 649 pg = read_cache_page_async(inode->i_mapping, offset >> PAGE_CACHE_SHIFT, 650 (void *)jffs2_do_readpage_unlock, inode); 651 if (IS_ERR(pg)) 652 return (void *)pg; 653 654 *priv = (unsigned long)pg; 655 return kmap(pg); 656 } 657 658 void jffs2_gc_release_page(struct jffs2_sb_info *c, 659 unsigned char *ptr, 660 unsigned long *priv) 661 { 662 struct page *pg = (void *)*priv; 663 664 kunmap(pg); 665 page_cache_release(pg); 666 } 667 668 static int jffs2_flash_setup(struct jffs2_sb_info *c) { 669 int ret = 0; 670 671 if (jffs2_cleanmarker_oob(c)) { 672 /* NAND flash... do setup accordingly */ 673 ret = jffs2_nand_flash_setup(c); 674 if (ret) 675 return ret; 676 } 677 678 /* and Dataflash */ 679 if (jffs2_dataflash(c)) { 680 ret = jffs2_dataflash_setup(c); 681 if (ret) 682 return ret; 683 } 684 685 /* and Intel "Sibley" flash */ 686 if (jffs2_nor_wbuf_flash(c)) { 687 ret = jffs2_nor_wbuf_flash_setup(c); 688 if (ret) 689 return ret; 690 } 691 692 /* and an UBI volume */ 693 if (jffs2_ubivol(c)) { 694 ret = jffs2_ubivol_setup(c); 695 if (ret) 696 return ret; 697 } 698 699 return ret; 700 } 701 702 void jffs2_flash_cleanup(struct jffs2_sb_info *c) { 703 704 if (jffs2_cleanmarker_oob(c)) { 705 jffs2_nand_flash_cleanup(c); 706 } 707 708 /* and DataFlash */ 709 if (jffs2_dataflash(c)) { 710 jffs2_dataflash_cleanup(c); 711 } 712 713 /* and Intel "Sibley" flash */ 714 if (jffs2_nor_wbuf_flash(c)) { 715 jffs2_nor_wbuf_flash_cleanup(c); 716 } 717 718 /* and an UBI volume */ 719 if (jffs2_ubivol(c)) { 720 jffs2_ubivol_cleanup(c); 721 } 722 } 723