From: Andiry Xu <jix024@xxxxxxxxxxx> Similar to unlink. Signed-off-by: Andiry Xu <jix024@xxxxxxxxxxx> --- fs/nova/namei.c | 105 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 105 insertions(+) diff --git a/fs/nova/namei.c b/fs/nova/namei.c index 360d716..4bf6396 100644 --- a/fs/nova/namei.c +++ b/fs/nova/namei.c @@ -437,6 +437,110 @@ static int nova_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) goto out; } +/* + * routine to check that the specified directory is empty (for rmdir) + */ +static int nova_empty_dir(struct inode *inode) +{ + struct super_block *sb; + struct nova_inode_info *si = NOVA_I(inode); + struct nova_inode_info_header *sih = &si->header; + struct nova_dentry *entry; + unsigned long pos = 0; + struct nova_dentry *entries[4]; + int nr_entries; + int i; + + sb = inode->i_sb; + nr_entries = radix_tree_gang_lookup(&sih->tree, + (void **)entries, pos, 4); + if (nr_entries > 2) + return 0; + + for (i = 0; i < nr_entries; i++) { + entry = entries[i]; + + if (!is_dir_init_entry(sb, entry)) + return 0; + } + + return 1; +} + +static int nova_rmdir(struct inode *dir, struct dentry *dentry) +{ + struct inode *inode = dentry->d_inode; + struct nova_dentry *de; + struct super_block *sb = inode->i_sb; + struct nova_inode *pi = nova_get_inode(sb, inode), *pidir; + struct nova_inode_update update_dir; + struct nova_inode_update update; + u64 old_linkc = 0; + struct nova_inode_info *si = NOVA_I(inode); + struct nova_inode_info_header *sih = &si->header; + int err = -ENOTEMPTY; + u64 epoch_id; + timing_t rmdir_time; + + NOVA_START_TIMING(rmdir_t, rmdir_time); + if (!inode) + return -ENOENT; + + nova_dbgv("%s: name %s\n", __func__, dentry->d_name.name); + pidir = nova_get_inode(sb, dir); + if (!pidir) + return -EINVAL; + + if (nova_inode_by_name(dir, &dentry->d_name, &de) == 0) + return -ENOENT; + + if (!nova_empty_dir(inode)) + return err; + + nova_dbgv("%s: inode %lu, dir %lu, link %d\n", __func__, + inode->i_ino, dir->i_ino, dir->i_nlink); + + if (inode->i_nlink != 2) + nova_dbg("empty directory %lu has nlink!=2 (%d), dir %lu", + inode->i_ino, inode->i_nlink, dir->i_ino); + + epoch_id = nova_get_epoch_id(sb); + + update_dir.tail = 0; + err = nova_remove_dentry(dentry, -1, &update_dir, epoch_id); + if (err) + goto end_rmdir; + + /*inode->i_version++; */ + clear_nlink(inode); + inode->i_ctime = dir->i_ctime; + + if (dir->i_nlink) + drop_nlink(dir); + + nova_delete_dir_tree(sb, sih); + + update.tail = 0; + err = nova_append_link_change_entry(sb, pi, inode, &update, + &old_linkc, epoch_id); + if (err) + goto end_rmdir; + + nova_lite_transaction_for_time_and_link(sb, pi, pidir, inode, dir, + &update, &update_dir, 1, epoch_id); + + nova_invalidate_link_change_entry(sb, old_linkc); + nova_invalidate_dentries(sb, &update_dir); + + NOVA_END_TIMING(rmdir_t, rmdir_time); + return err; + +end_rmdir: + nova_err(sb, "%s return %d\n", __func__, err); + NOVA_END_TIMING(rmdir_t, rmdir_time); + return err; +} + struct dentry *nova_get_parent(struct dentry *child) { struct inode *inode; @@ -467,5 +571,6 @@ const struct inode_operations nova_dir_inode_operations = { .link = nova_link, .unlink = nova_unlink, .mkdir = nova_mkdir, + .rmdir = nova_rmdir, .mknod = nova_mknod, }; -- 2.7.4