static struct inode * nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation) { struct inode *inode; if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO && ino != NILFS_SKETCH_INO) return ERR_PTR(-ESTALE); #if NEED_READ_INODE inode = iget(sb, ino); if (!inode) return ERR_PTR(-ENOMEM); if (is_bad_inode(inode)) { iput(inode); return ERR_PTR(-ESTALE); } #else inode = nilfs_iget(sb, ino); if (IS_ERR(inode)) return ERR_CAST(inode); #endif if (generation && inode->i_generation != generation) { iput(inode); return ERR_PTR(-ESTALE); } return inode; }
static int recover_dsync_blocks(struct nilfs_sb_info *sbi, struct list_head *head, unsigned long *nr_salvaged_blocks) { struct inode *inode; struct nilfs_recovery_block *rb, *n; unsigned blocksize = sbi->s_super->s_blocksize; struct page *page; loff_t pos; int err = 0, err2 = 0; list_for_each_entry_safe(rb, n, head, list) { inode = nilfs_iget(sbi->s_super, rb->ino); if (IS_ERR(inode)) { err = PTR_ERR(inode); inode = NULL; goto failed_inode; } pos = rb->blkoff << inode->i_blkbits; page = NULL; err = block_write_begin(NULL, inode->i_mapping, pos, blocksize, 0, &page, NULL, nilfs_get_block); if (unlikely(err)) goto failed_inode; err = nilfs_recovery_copy_block(sbi, rb, page); if (unlikely(err)) goto failed_page; err = nilfs_set_file_dirty(sbi, inode, 1); if (unlikely(err)) goto failed_page; block_write_end(NULL, inode->i_mapping, pos, blocksize, blocksize, page, NULL); unlock_page(page); page_cache_release(page); (*nr_salvaged_blocks)++; goto next; failed_page: unlock_page(page); page_cache_release(page); failed_inode: printk(KERN_WARNING "NILFS warning: error recovering data block " "(err=%d, ino=%lu, block-offset=%llu)\n", err, rb->ino, (unsigned long long)rb->blkoff); if (!err2) err2 = err; next: iput(inode); /* iput(NULL) is just ignored */ list_del_init(&rb->list); kfree(rb); }
static struct dentry * nilfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) { struct inode *inode; ino_t ino; if (dentry->d_name.len > NILFS_NAME_LEN) return ERR_PTR(-ENAMETOOLONG); ino = nilfs_inode_by_name(dir, &dentry->d_name); inode = ino ? nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino) : NULL; return d_splice_alias(inode, dentry); }
static int nilfs_get_root_dentry(struct super_block *sb, struct nilfs_root *root, struct dentry **root_dentry) { struct inode *inode; struct dentry *dentry; int ret = 0; inode = nilfs_iget(sb, root, NILFS_ROOT_INO); if (IS_ERR(inode)) { printk(KERN_ERR "NILFS: get root inode failed\n"); ret = PTR_ERR(inode); goto out; } if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { iput(inode); printk(KERN_ERR "NILFS: corrupt root inode.\n"); ret = -EINVAL; goto out; } if (root->cno == NILFS_CPTREE_CURRENT_CNO) { dentry = d_find_alias(inode); if (!dentry) { dentry = d_alloc_root(inode); if (!dentry) { iput(inode); ret = -ENOMEM; goto failed_dentry; } } else { iput(inode); } } else { dentry = d_obtain_alias(inode); if (IS_ERR(dentry)) { ret = PTR_ERR(dentry); goto failed_dentry; } } *root_dentry = dentry; out: return ret; failed_dentry: printk(KERN_ERR "NILFS: get root dentry failed\n"); goto out; }
static int nilfs_get_root_dentry(struct super_block *sb, struct nilfs_root *root, struct dentry **root_dentry) { struct inode *inode; struct dentry *dentry; int ret = 0; inode = nilfs_iget(sb, root, NILFS_ROOT_INO); if (IS_ERR(inode)) { ret = PTR_ERR(inode); nilfs_msg(sb, KERN_ERR, "error %d getting root inode", ret); goto out; } if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { iput(inode); nilfs_msg(sb, KERN_ERR, "corrupt root inode"); ret = -EINVAL; goto out; } if (root->cno == NILFS_CPTREE_CURRENT_CNO) { dentry = d_find_alias(inode); if (!dentry) { dentry = d_make_root(inode); if (!dentry) { ret = -ENOMEM; goto failed_dentry; } } else { iput(inode); } } else { dentry = d_obtain_root(inode); if (IS_ERR(dentry)) { ret = PTR_ERR(dentry); goto failed_dentry; } } *root_dentry = dentry; out: return ret; failed_dentry: nilfs_msg(sb, KERN_ERR, "error %d getting root dentry", ret); goto out; }
struct dentry *nilfs_get_parent(struct dentry *child) { unsigned long ino; struct inode *inode; struct dentry dotdot; dotdot.d_name.name = ".."; dotdot.d_name.len = 2; ino = nilfs_inode_by_name(child->d_inode, &dotdot); if (!ino) return ERR_PTR(-ENOENT); inode = nilfs_iget(child->d_inode->i_sb, ino); if (IS_ERR(inode)) return ERR_CAST(inode); return d_obtain_alias(inode); }
static struct dentry * nilfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { struct inode *inode; ino_t ino; if (dentry->d_name.len > NILFS_NAME_LEN) return ERR_PTR(-ENAMETOOLONG); ino = nilfs_inode_by_name(dir, dentry); inode = NULL; if (ino) { inode = nilfs_iget(dir->i_sb, ino); if (IS_ERR(inode)) return ERR_CAST(inode); } return d_splice_alias(inode, dentry); }
/* * Export operations */ static struct dentry *nilfs_get_parent(struct dentry *child) { unsigned long ino; struct inode *inode; struct qstr dotdot = QSTR_INIT("..", 2); struct nilfs_root *root; ino = nilfs_inode_by_name(d_inode(child), &dotdot); if (!ino) return ERR_PTR(-ENOENT); root = NILFS_I(d_inode(child))->i_root; inode = nilfs_iget(child->d_sb, root, ino); if (IS_ERR(inode)) return ERR_CAST(inode); return d_obtain_alias(inode); }
static struct inode * nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation) { struct inode *inode; if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO && ino != NILFS_SKETCH_INO) return ERR_PTR(-ESTALE); inode = nilfs_iget(sb, ino); if (IS_ERR(inode)) return ERR_CAST(inode); if (generation && inode->i_generation != generation) { iput(inode); return ERR_PTR(-ESTALE); } return inode; }
static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno, u64 ino, u32 gen) { struct nilfs_root *root; struct inode *inode; if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO) return ERR_PTR(-ESTALE); root = nilfs_lookup_root(sb->s_fs_info, cno); if (!root) return ERR_PTR(-ESTALE); inode = nilfs_iget(sb, root, ino); nilfs_put_root(root); if (IS_ERR(inode)) return ERR_CAST(inode); if (gen && inode->i_generation != gen) { iput(inode); return ERR_PTR(-ESTALE); } return d_obtain_alias(inode); }
/* * Export operations */ static struct dentry *nilfs_get_parent(struct dentry *child) { unsigned long ino; struct inode *inode; struct qstr dotdot = {.name = "..", .len = 2}; struct nilfs_root *root; ino = nilfs_inode_by_name(child->d_inode, &dotdot); if (!ino) return ERR_PTR(-ENOENT); root = NILFS_I(child->d_inode)->i_root; inode = nilfs_iget(child->d_inode->i_sb, root, ino); if (IS_ERR(inode)) return ERR_CAST(inode); return d_obtain_alias(inode); } static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno, u64 ino, u32 gen) { struct nilfs_root *root; struct inode *inode; if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO) return ERR_PTR(-ESTALE); root = nilfs_lookup_root(sb->s_fs_info, cno); if (!root) return ERR_PTR(-ESTALE); inode = nilfs_iget(sb, root, ino); nilfs_put_root(root); if (IS_ERR(inode)) return ERR_CAST(inode); if (gen && inode->i_generation != gen) { iput(inode); return ERR_PTR(-ESTALE); } return d_obtain_alias(inode); } static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh, int fh_len, int fh_type) { struct nilfs_fid *fid = (struct nilfs_fid *)fh; if ((fh_len != NILFS_FID_SIZE_NON_CONNECTABLE && fh_len != NILFS_FID_SIZE_CONNECTABLE) || (fh_type != FILEID_NILFS_WITH_PARENT && fh_type != FILEID_NILFS_WITHOUT_PARENT)) return NULL; return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen); } static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh, int fh_len, int fh_type) { struct nilfs_fid *fid = (struct nilfs_fid *)fh; if (fh_len != NILFS_FID_SIZE_CONNECTABLE || fh_type != FILEID_NILFS_WITH_PARENT) return NULL; return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen); } static int nilfs_encode_fh(struct dentry *dentry, __u32 *fh, int *lenp, int connectable) { struct nilfs_fid *fid = (struct nilfs_fid *)fh; struct inode *inode = dentry->d_inode; struct nilfs_root *root = NILFS_I(inode)->i_root; int type; if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE || (connectable && *lenp < NILFS_FID_SIZE_CONNECTABLE)) return 255; fid->cno = root->cno; fid->ino = inode->i_ino; fid->gen = inode->i_generation; if (connectable && !S_ISDIR(inode->i_mode)) { struct inode *parent; spin_lock(&dentry->d_lock); parent = dentry->d_parent->d_inode; fid->parent_ino = parent->i_ino; fid->parent_gen = parent->i_generation; spin_unlock(&dentry->d_lock); type = FILEID_NILFS_WITH_PARENT; *lenp = NILFS_FID_SIZE_CONNECTABLE; } else { type = FILEID_NILFS_WITHOUT_PARENT; *lenp = NILFS_FID_SIZE_NON_CONNECTABLE; } return type; } const struct inode_operations nilfs_dir_inode_operations = { .create = nilfs_create, .lookup = nilfs_lookup, .link = nilfs_link, .unlink = nilfs_unlink, .symlink = nilfs_symlink, .mkdir = nilfs_mkdir, .rmdir = nilfs_rmdir, .mknod = nilfs_mknod, .rename = nilfs_rename, .setattr = nilfs_setattr, .permission = nilfs_permission, .fiemap = nilfs_fiemap, }; const struct inode_operations nilfs_special_inode_operations = { .setattr = nilfs_setattr, .permission = nilfs_permission, }; const struct inode_operations nilfs_symlink_inode_operations = { .readlink = generic_readlink, .follow_link = page_follow_link_light, .put_link = page_put_link, .permission = nilfs_permission, }; const struct export_operations nilfs_export_ops = { .encode_fh = nilfs_encode_fh, .fh_to_dentry = nilfs_fh_to_dentry, .fh_to_parent = nilfs_fh_to_parent, .get_parent = nilfs_get_parent, };
static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs, struct super_block *sb, struct nilfs_root *root, struct list_head *head, unsigned long *nr_salvaged_blocks) { struct inode *inode; struct nilfs_recovery_block *rb, *n; unsigned int blocksize = nilfs->ns_blocksize; struct page *page; loff_t pos; int err = 0, err2 = 0; list_for_each_entry_safe(rb, n, head, list) { inode = nilfs_iget(sb, root, rb->ino); if (IS_ERR(inode)) { err = PTR_ERR(inode); inode = NULL; goto failed_inode; } pos = rb->blkoff << inode->i_blkbits; err = block_write_begin(inode->i_mapping, pos, blocksize, 0, &page, nilfs_get_block); if (unlikely(err)) { loff_t isize = inode->i_size; if (pos + blocksize > isize) nilfs_write_failed(inode->i_mapping, pos + blocksize); goto failed_inode; } err = nilfs_recovery_copy_block(nilfs, rb, page); if (unlikely(err)) goto failed_page; err = nilfs_set_file_dirty(inode, 1); if (unlikely(err)) goto failed_page; block_write_end(NULL, inode->i_mapping, pos, blocksize, blocksize, page, NULL); unlock_page(page); put_page(page); (*nr_salvaged_blocks)++; goto next; failed_page: unlock_page(page); put_page(page); failed_inode: nilfs_msg(sb, KERN_WARNING, "error %d recovering data block (ino=%lu, block-offset=%llu)", err, (unsigned long)rb->ino, (unsigned long long)rb->blkoff); if (!err2) err2 = err; next: iput(inode); /* iput(NULL) is just ignored */ list_del_init(&rb->list); kfree(rb); }
/** * nilfs_fill_super() - initialize a super block instance * @sb: super_block * @data: mount options * @silent: silent mode flag * @nilfs: the_nilfs struct * * This function is called exclusively by nilfs->ns_mount_mutex. * So, the recovery process is protected from other simultaneous mounts. */ static int nilfs_fill_super(struct super_block *sb, void *data, int silent, struct the_nilfs *nilfs) { struct nilfs_sb_info *sbi; struct inode *root; __u64 cno; int err; sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); if (!sbi) return -ENOMEM; sb->s_fs_info = sbi; get_nilfs(nilfs); sbi->s_nilfs = nilfs; sbi->s_super = sb; atomic_set(&sbi->s_count, 1); err = init_nilfs(nilfs, sbi, (char *)data); if (err) goto failed_sbi; spin_lock_init(&sbi->s_inode_lock); INIT_LIST_HEAD(&sbi->s_dirty_files); INIT_LIST_HEAD(&sbi->s_list); /* * Following initialization is overlapped because * nilfs_sb_info structure has been cleared at the beginning. * But we reserve them to keep our interest and make ready * for the future change. */ get_random_bytes(&sbi->s_next_generation, sizeof(sbi->s_next_generation)); spin_lock_init(&sbi->s_next_gen_lock); sb->s_op = &nilfs_sops; sb->s_export_op = &nilfs_export_ops; sb->s_root = NULL; sb->s_time_gran = 1; sb->s_bdi = nilfs->ns_bdi; err = load_nilfs(nilfs, sbi); if (err) goto failed_sbi; cno = nilfs_last_cno(nilfs); if (sb->s_flags & MS_RDONLY) { if (nilfs_test_opt(sbi, SNAPSHOT)) { down_read(&nilfs->ns_segctor_sem); err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, sbi->s_snapshot_cno); up_read(&nilfs->ns_segctor_sem); if (err < 0) { if (err == -ENOENT) err = -EINVAL; goto failed_sbi; } if (!err) { printk(KERN_ERR "NILFS: The specified checkpoint is " "not a snapshot " "(checkpoint number=%llu).\n", (unsigned long long)sbi->s_snapshot_cno); err = -EINVAL; goto failed_sbi; } cno = sbi->s_snapshot_cno; } } err = nilfs_attach_checkpoint(sbi, cno); if (err) { printk(KERN_ERR "NILFS: error loading a checkpoint" " (checkpoint number=%llu).\n", (unsigned long long)cno); goto failed_sbi; } if (!(sb->s_flags & MS_RDONLY)) { err = nilfs_attach_segment_constructor(sbi); if (err) goto failed_checkpoint; } root = nilfs_iget(sb, NILFS_ROOT_INO); if (IS_ERR(root)) { printk(KERN_ERR "NILFS: get root inode failed\n"); err = PTR_ERR(root); goto failed_segctor; } if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { iput(root); printk(KERN_ERR "NILFS: corrupt root inode.\n"); err = -EINVAL; goto failed_segctor; } sb->s_root = d_alloc_root(root); if (!sb->s_root) { iput(root); printk(KERN_ERR "NILFS: get root dentry failed\n"); err = -ENOMEM; goto failed_segctor; } if (!(sb->s_flags & MS_RDONLY)) { down_write(&nilfs->ns_sem); nilfs_setup_super(sbi); up_write(&nilfs->ns_sem); } down_write(&nilfs->ns_super_sem); if (!nilfs_test_opt(sbi, SNAPSHOT)) nilfs->ns_current = sbi; up_write(&nilfs->ns_super_sem); return 0; failed_segctor: nilfs_detach_segment_constructor(sbi); failed_checkpoint: nilfs_detach_checkpoint(sbi); failed_sbi: put_nilfs(nilfs); sb->s_fs_info = NULL; nilfs_put_sbinfo(sbi); return err; }