From patchwork Tue Jul 21 08:37:45 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Dongsheng X-Patchwork-Id: 6833381 Return-Path: X-Original-To: patchwork-linux-fsdevel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 01BAA9F380 for ; Tue, 21 Jul 2015 08:44:24 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D23FC20690 for ; Tue, 21 Jul 2015 08:44:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B625220678 for ; Tue, 21 Jul 2015 08:44:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754175AbbGUInw (ORCPT ); Tue, 21 Jul 2015 04:43:52 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:46681 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1754171AbbGUInv (ORCPT ); Tue, 21 Jul 2015 04:43:51 -0400 X-IronPort-AV: E=Sophos;i="5.13,665,1427731200"; d="scan'208";a="98671212" Received: from unknown (HELO edo.cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 21 Jul 2015 16:47:23 +0800 Received: from G08CNEXCHPEKD02.g08.fujitsu.local (localhost.localdomain [127.0.0.1]) by edo.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id t6L8frNv005037; Tue, 21 Jul 2015 16:41:53 +0800 Received: from yds-PC.g08.fujitsu.local (10.167.226.66) by G08CNEXCHPEKD02.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.181.6; Tue, 21 Jul 2015 16:43:40 +0800 From: Dongsheng Yang To: , , CC: , , Dongsheng Yang Subject: [PATCH 14/25] ubifs: implement IO functions for quota files Date: Tue, 21 Jul 2015 16:37:45 +0800 Message-ID: <1437467876-22106-15-git-send-email-yangds.fnst@cn.fujitsu.com> X-Mailer: git-send-email 1.8.4.2 In-Reply-To: <1437467876-22106-1-git-send-email-yangds.fnst@cn.fujitsu.com> References: <1437467876-22106-1-git-send-email-yangds.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.66] Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Spam-Status: No, score=-8.1 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We have to implement 3 functions to support quota in ubifs: ubifs_quota_read(), ubifs_quota_write() and ubifs_get_quotas() ubifs_quota_read(): callback to read quota file. ubifs_quota_write(): callback to write data to quota file. ubifs_get_quotas(): callback to get quota instance for inode. Signed-off-by: Dongsheng Yang --- fs/ubifs/super.c | 206 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 206 insertions(+) diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index 5fa21d6..4e60330 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -929,6 +929,207 @@ static int check_volume_empty(struct ubifs_info *c) return 0; } +#ifdef CONFIG_QUOTA +static ssize_t ubifs_quota_read(struct super_block *sb, int type, char *data, + size_t len, loff_t off) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + unsigned long block = off >> UBIFS_BLOCK_SHIFT; + int offset = off & (sb->s_blocksize - 1); + int tocopy = 0; + size_t toread; + loff_t i_size = i_size_read(inode); + char *block_buf; + struct ubifs_data_node *dn; + int ret, err = 0; + + if (off > i_size) + goto out; + + if (off + len > i_size) + len = i_size - off; + toread = len; + + dn = kmalloc(UBIFS_MAX_DATA_NODE_SZ, GFP_NOFS); + if (!dn) { + err = -ENOMEM; + goto out; + } + + block_buf = kmalloc(sb->s_blocksize, GFP_NOFS); + if (!block_buf) { + err = -ENOMEM; + goto free_dn; + } + + if (offset) { + /* Read the un-aligned data in first block */ + tocopy = sb->s_blocksize - offset; + if (toread < tocopy) + tocopy = toread; + + ret = read_block(inode, block_buf, block, dn); + if (ret) { + err = ret; + if (err != ENOENT) { + goto free_buf; + } + } + + memcpy(data, block_buf + offset, tocopy); + + block++; + toread -= tocopy; + data += tocopy; + tocopy = 0; + } + + while (toread > 0) { + tocopy = sb->s_blocksize < toread ? + sb->s_blocksize : toread; + + /* Break to read the last block */ + if (tocopy < sb->s_blocksize) + break; + + ret = read_block(inode, data, block, dn); + if (ret) { + err = ret; + if (err != -ENOENT) + goto free_buf; + } + block++;; + toread -= tocopy; + data += tocopy; + tocopy = 0; + } + + if (tocopy) { + /* Read the data in last block */ + ret = read_block(inode, block_buf, block, dn); + if (ret) { + err = ret; + if (err != ENOENT) { + goto free_buf; + } + } + + memcpy(data, block_buf, tocopy); + } +free_buf: + kfree(block_buf); +free_dn: + kfree(dn); +out: + if (!err) { + return len; + } + return err; +} + +static ssize_t ubifs_quota_write(struct super_block *sb, int type, + const char *data, size_t len, loff_t off) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + unsigned long block = off >> UBIFS_BLOCK_SHIFT; + unsigned long blocks = len >> UBIFS_BLOCK_SHIFT; + struct ubifs_info *c = inode->i_sb->s_fs_info; + int offset = off & (sb->s_blocksize - 1); + union ubifs_key key; + int tocopy = 0; + size_t towrite = len; + int ret, err = 0; + struct ubifs_budget_req req = {}; + int dirtied_block = 0, new_block = 0; + + if (off + len > inode->i_size) + new_block = (off + len - inode->i_size) >> UBIFS_BLOCK_SHIFT; + dirtied_block = blocks - new_block; + if (offset) + dirtied_block += 1; + req.dirtied_block_num = dirtied_block; + req.new_block_num = new_block; + + err = ubifs_budget_space(c, &req); + if (err) + goto out; + + if (offset) { + struct ubifs_data_node *dn; + char *block_buf; + + dn = kmalloc(UBIFS_MAX_DATA_NODE_SZ, GFP_NOFS); + if (!dn) { + err = -ENOMEM; + goto release_budget; + } + + block_buf = kmalloc(sb->s_blocksize, GFP_NOFS); + if (!block_buf) { + err = -ENOMEM; + kfree(dn); + goto release_budget; + } + + /* Write the un-aligned data in first block */ + tocopy = sb->s_blocksize - offset; + if (towrite < tocopy) + tocopy = towrite; + + ret = read_block(inode, block_buf, block, dn); + if (ret) { + err = ret; + if (err != ENOENT) { + kfree(block_buf); + kfree(dn); + goto release_budget; + } + } + + memcpy(block_buf + offset, data, tocopy); + + data_key_init(c, &key, inode->i_ino, block); + err = ubifs_jnl_write_data(c, inode, &key, block_buf, sb->s_blocksize); + if (err) { + kfree(block_buf); + kfree(dn); + goto release_budget; + } + + block++; + towrite -= tocopy; + data += tocopy; + } + + while (towrite > 0) { + tocopy = sb->s_blocksize < towrite ? + sb->s_blocksize : towrite; + + data_key_init(c, &key, inode->i_ino, block); + err = ubifs_jnl_write_data(c, inode, &key, data, tocopy); + if (err) + break; + block++;; + towrite -= tocopy; + data += tocopy; + } + + err = inode->i_sb->s_op->write_inode(inode, NULL); +release_budget: + /* quota write success, we have to release the budget.*/ + ubifs_release_budget(c, &req); +out: + if (!err) + return len; + return err; +} + +static struct dquot **ubifs_get_dquots(struct inode *inode) +{ + return ubifs_inode(inode)->i_dquot; +} +#endif + /* * UBIFS mount options. * @@ -1928,6 +2129,11 @@ const struct super_operations ubifs_super_operations = { .remount_fs = ubifs_remount_fs, .show_options = ubifs_show_options, .sync_fs = ubifs_sync_fs, +#ifdef CONFIG_QUOTA + .quota_read = ubifs_quota_read, + .quota_write = ubifs_quota_write, + .get_dquots = ubifs_get_dquots, +#endif }; /**