void jffs2_clear_inode (struct inode *inode) { /* We can forget about this inode for now - drop all * the nodelists associated with it, etc. */ struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); D1(printk(KERN_DEBUG "jffs2_clear_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode)); jffs2_do_clear_inode(c, f); }
int jffs2_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) { struct jffs2_raw_inode n; struct jffs2_inode_info *f = kzalloc(sizeof(*f), GFP_KERNEL); int ret; if (!f) return -ENOMEM; init_MUTEX_LOCKED(&f->sem); f->inocache = ic; ret = jffs2_do_read_inode_internal(c, f, &n); if (!ret) { up(&f->sem); jffs2_do_clear_inode(c, f); } kfree (f); return ret; }
int jffs2_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) { struct jffs2_raw_inode n; struct jffs2_inode_info *f = kzalloc(sizeof(*f), GFP_KERNEL); int ret; if (!f) return -ENOMEM; mutex_init(&f->sem); mutex_lock(&f->sem); f->inocache = ic; ret = jffs2_do_read_inode_internal(c, f, &n); if (!ret) { mutex_unlock(&f->sem); jffs2_do_clear_inode(c, f); } jffs2_xattr_do_crccheck_inode(c, ic); kfree (f); return ret; }
static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_raw_inode *latest_node) { struct jffs2_tmp_dnode_info *tn; struct rb_root tn_list; struct rb_node *rb, *repl_rb; struct jffs2_full_dirent *fd_list; struct jffs2_full_dnode *fn, *first_fn = NULL; uint32_t crc; uint32_t latest_mctime, mctime_ver; size_t retlen; int ret; dbg_readinode("ino #%u nlink is %d\n", f->inocache->ino, f->inocache->nlink); /* Grab all nodes relevant to this ino */ ret = jffs2_get_inode_nodes(c, f, &tn_list, &fd_list, &f->highest_version, &latest_mctime, &mctime_ver); if (ret) { JFFS2_ERROR("cannot read nodes for ino %u, returned error is %d\n", f->inocache->ino, ret); if (f->inocache->state == INO_STATE_READING) jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); return ret; } f->dents = fd_list; rb = rb_first(&tn_list); while (rb) { cond_resched(); tn = rb_entry(rb, struct jffs2_tmp_dnode_info, rb); fn = tn->fn; ret = 1; dbg_readinode("consider node ver %u, phys offset " "%#08x(%d), range %u-%u.\n", tn->version, ref_offset(fn->raw), ref_flags(fn->raw), fn->ofs, fn->ofs + fn->size); if (fn->size) { ret = jffs2_add_older_frag_to_fragtree(c, f, tn); /* TODO: the error code isn't checked, check it */ jffs2_dbg_fragtree_paranoia_check_nolock(f); BUG_ON(ret < 0); if (!first_fn && ret == 0) first_fn = fn; } else if (!first_fn) { first_fn = fn; f->metadata = fn; ret = 0; /* Prevent freeing the metadata update node */ } else jffs2_mark_node_obsolete(c, fn->raw); BUG_ON(rb->rb_left); if (rb->rb_parent && rb->rb_parent->rb_left == rb) { /* We were then left-hand child of our parent. We need * to move our own right-hand child into our place. */ repl_rb = rb->rb_right; if (repl_rb) repl_rb->rb_parent = rb->rb_parent; } else repl_rb = NULL; rb = rb_next(rb); /* Remove the spent tn from the tree; don't bother rebalancing * but put our right-hand child in our own place. */ if (tn->rb.rb_parent) { if (tn->rb.rb_parent->rb_left == &tn->rb) tn->rb.rb_parent->rb_left = repl_rb; else if (tn->rb.rb_parent->rb_right == &tn->rb) tn->rb.rb_parent->rb_right = repl_rb; else BUG(); } else if (tn->rb.rb_right) tn->rb.rb_right->rb_parent = NULL; jffs2_free_tmp_dnode_info(tn); if (ret) { dbg_readinode("delete dnode %u-%u.\n", fn->ofs, fn->ofs + fn->size); jffs2_free_full_dnode(fn); } } jffs2_dbg_fragtree_paranoia_check_nolock(f); BUG_ON(first_fn && ref_obsolete(first_fn->raw)); fn = first_fn; if (unlikely(!first_fn)) { /* No data nodes for this inode. */ if (f->inocache->ino != 1) { JFFS2_WARNING("no data nodes found for ino #%u\n", f->inocache->ino); if (!fd_list) { if (f->inocache->state == INO_STATE_READING) jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); return -EIO; } JFFS2_NOTICE("but it has children so we fake some modes for it\n"); } latest_node->mode = cpu_to_jemode(S_IFDIR|S_IRUGO|S_IWUSR|S_IXUGO); latest_node->version = cpu_to_je32(0); latest_node->atime = latest_node->ctime = latest_node->mtime = cpu_to_je32(0); latest_node->isize = cpu_to_je32(0); latest_node->gid = cpu_to_je16(0); latest_node->uid = cpu_to_je16(0); if (f->inocache->state == INO_STATE_READING) jffs2_set_inocache_state(c, f->inocache, INO_STATE_PRESENT); return 0; } ret = jffs2_flash_read(c, ref_offset(fn->raw), sizeof(*latest_node), &retlen, (void *)latest_node); if (ret || retlen != sizeof(*latest_node)) { JFFS2_ERROR("failed to read from flash: error %d, %zd of %zd bytes read\n", ret, retlen, sizeof(*latest_node)); /* FIXME: If this fails, there seems to be a memory leak. Find it. */ up(&f->sem); jffs2_do_clear_inode(c, f); return ret?ret:-EIO; } crc = crc32(0, latest_node, sizeof(*latest_node)-8); if (crc != je32_to_cpu(latest_node->node_crc)) { JFFS2_ERROR("CRC failed for read_inode of inode %u at physical location 0x%x\n", f->inocache->ino, ref_offset(fn->raw)); up(&f->sem); jffs2_do_clear_inode(c, f); return -EIO; } switch(jemode_to_cpu(latest_node->mode) & S_IFMT) { case S_IFDIR: if (mctime_ver > je32_to_cpu(latest_node->version)) { /* The times in the latest_node are actually older than mctime in the latest dirent. Cheat. */ latest_node->ctime = latest_node->mtime = cpu_to_je32(latest_mctime); } break; case S_IFREG: /* If it was a regular file, truncate it to the latest node's isize */ jffs2_truncate_fragtree(c, &f->fragtree, je32_to_cpu(latest_node->isize)); break; case S_IFLNK: /* Hack to work around broken isize in old symlink code. Remove this when dwmw2 comes to his senses and stops symlinks from being an entirely gratuitous special case. */ if (!je32_to_cpu(latest_node->isize)) latest_node->isize = latest_node->dsize; if (f->inocache->state != INO_STATE_CHECKING) { /* Symlink's inode data is the target path. Read it and * keep in RAM to facilitate quick follow symlink * operation. */ f->target = kmalloc(je32_to_cpu(latest_node->csize) + 1, GFP_KERNEL); if (!f->target) { JFFS2_ERROR("can't allocate %d bytes of memory for the symlink target path cache\n", je32_to_cpu(latest_node->csize)); up(&f->sem); jffs2_do_clear_inode(c, f); return -ENOMEM; } ret = jffs2_flash_read(c, ref_offset(fn->raw) + sizeof(*latest_node), je32_to_cpu(latest_node->csize), &retlen, (char *)f->target); if (ret || retlen != je32_to_cpu(latest_node->csize)) { if (retlen != je32_to_cpu(latest_node->csize)) ret = -EIO; kfree(f->target); f->target = NULL; up(&f->sem); jffs2_do_clear_inode(c, f); return -ret; } f->target[je32_to_cpu(latest_node->csize)] = '\0'; dbg_readinode("symlink's target '%s' cached\n", f->target); } /* fall through... */ case S_IFBLK: case S_IFCHR: /* Certain inode types should have only one data node, and it's kept as the metadata node */ if (f->metadata) { JFFS2_ERROR("Argh. Special inode #%u with mode 0%o had metadata node\n", f->inocache->ino, jemode_to_cpu(latest_node->mode)); up(&f->sem); jffs2_do_clear_inode(c, f); return -EIO; } if (!frag_first(&f->fragtree)) { JFFS2_ERROR("Argh. Special inode #%u with mode 0%o has no fragments\n", f->inocache->ino, jemode_to_cpu(latest_node->mode)); up(&f->sem); jffs2_do_clear_inode(c, f); return -EIO; } /* ASSERT: f->fraglist != NULL */ if (frag_next(frag_first(&f->fragtree))) { JFFS2_ERROR("Argh. Special inode #%u with mode 0x%x had more than one node\n", f->inocache->ino, jemode_to_cpu(latest_node->mode)); /* FIXME: Deal with it - check crc32, check for duplicate node, check times and discard the older one */ up(&f->sem); jffs2_do_clear_inode(c, f); return -EIO; } /* OK. We're happy */ f->metadata = frag_first(&f->fragtree)->node; jffs2_free_node_frag(frag_first(&f->fragtree)); f->fragtree = RB_ROOT; break; } if (f->inocache->state == INO_STATE_READING) jffs2_set_inocache_state(c, f->inocache, INO_STATE_PRESENT); return 0; }
static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_raw_inode *latest_node) { struct jffs2_readinode_info rii; uint32_t crc, new_size; size_t retlen; int ret; dbg_readinode("ino #%u pino/nlink is %d\n", f->inocache->ino, f->inocache->pino_nlink); memset(&rii, 0, sizeof(rii)); /* Grab all nodes relevant to this ino */ ret = jffs2_get_inode_nodes(c, f, &rii); if (ret) { JFFS2_ERROR("cannot read nodes for ino %u, returned error is %d\n", f->inocache->ino, ret); if (f->inocache->state == INO_STATE_READING) jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); return ret; } ret = jffs2_build_inode_fragtree(c, f, &rii); if (ret) { JFFS2_ERROR("Failed to build final fragtree for inode #%u: error %d\n", f->inocache->ino, ret); if (f->inocache->state == INO_STATE_READING) jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); jffs2_free_tmp_dnode_info_list(&rii.tn_root); /* FIXME: We could at least crc-check them all */ if (rii.mdata_tn) { jffs2_free_full_dnode(rii.mdata_tn->fn); jffs2_free_tmp_dnode_info(rii.mdata_tn); rii.mdata_tn = NULL; } return ret; } if (rii.mdata_tn) { if (rii.mdata_tn->fn->raw == rii.latest_ref) { f->metadata = rii.mdata_tn->fn; jffs2_free_tmp_dnode_info(rii.mdata_tn); } else { jffs2_kill_tn(c, rii.mdata_tn); } rii.mdata_tn = NULL; } f->dents = rii.fds; jffs2_dbg_fragtree_paranoia_check_nolock(f); if (unlikely(!rii.latest_ref)) { /* No data nodes for this inode. */ if (f->inocache->ino != 1) { JFFS2_WARNING("no data nodes found for ino #%u\n", f->inocache->ino); if (!rii.fds) { if (f->inocache->state == INO_STATE_READING) jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); return -EIO; } JFFS2_NOTICE("but it has children so we fake some modes for it\n"); } latest_node->mode = cpu_to_jemode(S_IFDIR|S_IRUGO|S_IWUSR|S_IXUGO); latest_node->version = cpu_to_je32(0); latest_node->atime = latest_node->ctime = latest_node->mtime = cpu_to_je32(0); latest_node->isize = cpu_to_je32(0); latest_node->gid = cpu_to_je16(0); latest_node->uid = cpu_to_je16(0); if (f->inocache->state == INO_STATE_READING) jffs2_set_inocache_state(c, f->inocache, INO_STATE_PRESENT); return 0; } ret = jffs2_flash_read(c, ref_offset(rii.latest_ref), sizeof(*latest_node), &retlen, (void *)latest_node); if (ret || retlen != sizeof(*latest_node)) { JFFS2_ERROR("failed to read from flash: error %d, %zd of %zd bytes read\n", ret, retlen, sizeof(*latest_node)); /* FIXME: If this fails, there seems to be a memory leak. Find it. */ mutex_unlock(&f->sem); jffs2_do_clear_inode(c, f); return ret?ret:-EIO; } crc = crc32(0, latest_node, sizeof(*latest_node)-8); if (crc != je32_to_cpu(latest_node->node_crc)) { JFFS2_ERROR("CRC failed for read_inode of inode %u at physical location 0x%x\n", f->inocache->ino, ref_offset(rii.latest_ref)); mutex_unlock(&f->sem); jffs2_do_clear_inode(c, f); return -EIO; } switch(jemode_to_cpu(latest_node->mode) & S_IFMT) { case S_IFDIR: if (rii.mctime_ver > je32_to_cpu(latest_node->version)) { /* The times in the latest_node are actually older than mctime in the latest dirent. Cheat. */ latest_node->ctime = latest_node->mtime = cpu_to_je32(rii.latest_mctime); } break; case S_IFREG: /* If it was a regular file, truncate it to the latest node's isize */ new_size = jffs2_truncate_fragtree(c, &f->fragtree, je32_to_cpu(latest_node->isize)); if (new_size != je32_to_cpu(latest_node->isize)) { JFFS2_WARNING("Truncating ino #%u to %d bytes failed because it only had %d bytes to start with!\n", f->inocache->ino, je32_to_cpu(latest_node->isize), new_size); latest_node->isize = cpu_to_je32(new_size); } break; case S_IFLNK: /* Hack to work around broken isize in old symlink code. Remove this when dwmw2 comes to his senses and stops symlinks from being an entirely gratuitous special case. */ if (!je32_to_cpu(latest_node->isize)) latest_node->isize = latest_node->dsize; if (f->inocache->state != INO_STATE_CHECKING) { /* Symlink's inode data is the target path. Read it and * keep in RAM to facilitate quick follow symlink * operation. */ f->target = kmalloc(je32_to_cpu(latest_node->csize) + 1, GFP_KERNEL); if (!f->target) { JFFS2_ERROR("can't allocate %d bytes of memory for the symlink target path cache\n", je32_to_cpu(latest_node->csize)); mutex_unlock(&f->sem); jffs2_do_clear_inode(c, f); return -ENOMEM; } ret = jffs2_flash_read(c, ref_offset(rii.latest_ref) + sizeof(*latest_node), je32_to_cpu(latest_node->csize), &retlen, (char *)f->target); if (ret || retlen != je32_to_cpu(latest_node->csize)) { if (retlen != je32_to_cpu(latest_node->csize)) ret = -EIO; kfree(f->target); f->target = NULL; mutex_unlock(&f->sem); jffs2_do_clear_inode(c, f); return ret; } f->target[je32_to_cpu(latest_node->csize)] = '\0'; dbg_readinode("symlink's target '%s' cached\n", f->target); } /* fall through... */ case S_IFBLK: case S_IFCHR: /* Certain inode types should have only one data node, and it's kept as the metadata node */ if (f->metadata) { JFFS2_ERROR("Argh. Special inode #%u with mode 0%o had metadata node\n", f->inocache->ino, jemode_to_cpu(latest_node->mode)); mutex_unlock(&f->sem); jffs2_do_clear_inode(c, f); return -EIO; } if (!frag_first(&f->fragtree)) { JFFS2_ERROR("Argh. Special inode #%u with mode 0%o has no fragments\n", f->inocache->ino, jemode_to_cpu(latest_node->mode)); mutex_unlock(&f->sem); jffs2_do_clear_inode(c, f); return -EIO; } /* ASSERT: f->fraglist != NULL */ if (frag_next(frag_first(&f->fragtree))) { JFFS2_ERROR("Argh. Special inode #%u with mode 0x%x had more than one node\n", f->inocache->ino, jemode_to_cpu(latest_node->mode)); /* FIXME: Deal with it - check crc32, check for duplicate node, check times and discard the older one */ mutex_unlock(&f->sem); jffs2_do_clear_inode(c, f); return -EIO; } /* OK. We're happy */ f->metadata = frag_first(&f->fragtree)->node; jffs2_free_node_frag(frag_first(&f->fragtree)); f->fragtree = RB_ROOT; break; } if (f->inocache->state == INO_STATE_READING) jffs2_set_inocache_state(c, f->inocache, INO_STATE_PRESENT); return 0; }
void jffs2_read_inode (struct inode *inode) { struct jffs2_inode_info *f; struct jffs2_sb_info *c; struct jffs2_raw_inode latest_node; int ret; D1(printk(KERN_DEBUG "jffs2_read_inode(): inode->i_ino == %lu\n", inode->i_ino)); f = JFFS2_INODE_INFO(inode); c = JFFS2_SB_INFO(inode->i_sb); jffs2_init_inode_info(f); down(&f->sem); ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); if (ret) { make_bad_inode(inode); up(&f->sem); return; } inode->i_mode = jemode_to_cpu(latest_node.mode); inode->i_uid = je16_to_cpu(latest_node.uid); inode->i_gid = je16_to_cpu(latest_node.gid); inode->i_size = je32_to_cpu(latest_node.isize); inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); inode->i_nlink = f->inocache->nlink; inode->i_blksize = PAGE_SIZE; inode->i_blocks = (inode->i_size + 511) >> 9; switch (inode->i_mode & S_IFMT) { jint16_t rdev; case S_IFLNK: inode->i_op = &jffs2_symlink_inode_operations; break; case S_IFDIR: { struct jffs2_full_dirent *fd; for (fd=f->dents; fd; fd = fd->next) { if (fd->type == DT_DIR && fd->ino) inode->i_nlink++; } /* and '..' */ inode->i_nlink++; /* Root dir gets i_nlink 3 for some reason */ if (inode->i_ino == 1) inode->i_nlink++; inode->i_op = &jffs2_dir_inode_operations; inode->i_fop = &jffs2_dir_operations; break; } case S_IFREG: inode->i_op = &jffs2_file_inode_operations; inode->i_fop = &jffs2_file_operations; inode->i_mapping->a_ops = &jffs2_file_address_operations; inode->i_mapping->nrpages = 0; break; case S_IFBLK: case S_IFCHR: /* Read the device numbers from the media */ D1(printk(KERN_DEBUG "Reading device numbers from flash\n")); if (jffs2_read_dnode(c, f, f->metadata, (char *)&rdev, 0, sizeof(rdev)) < 0) { /* Eep */ printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino); up(&f->sem); jffs2_do_clear_inode(c, f); make_bad_inode(inode); return; } case S_IFSOCK: case S_IFIFO: inode->i_op = &jffs2_file_inode_operations; init_special_inode(inode, inode->i_mode, old_decode_dev((je16_to_cpu(rdev)))); break; default: printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu\n", inode->i_mode, (unsigned long)inode->i_ino); } up(&f->sem); D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n")); }