Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751447AbeABGwm (ORCPT + 1 other); Tue, 2 Jan 2018 01:52:42 -0500 Received: from smtpbg302.qq.com ([184.105.206.27]:39263 "EHLO smtpbg302.qq.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751216AbeABGwl (ORCPT ); Tue, 2 Jan 2018 01:52:41 -0500 X-Greylist: delayed 431 seconds by postgrey-1.27 at vger.kernel.org; Tue, 02 Jan 2018 01:52:41 EST X-QQ-mid: esmtp31t1514875521td9ymmr2i X-QQ-SSF: A1000000000000F0FI110400000000P X-QQ-FEAT: /A5Igf99+LTQrA8iRklg+3gGUf804eMErWEuGTSg8NoaaJUg4xOFFsMqQYeJz E2UuovY3P7RMohWgbmYbgGSg5NawUdC8ZybVO4gTqnh9+NvaLUkSEApMZhOdZ/gVZOMF4Qq fZ2L78o+17f6AFneLknnNROaP9sqf1qfnYGkJnWIAjIABuuMu+N3B3bOL1ThVF0ryMt/FA1 qRSLFPEFQbkyNQSsdl8D/1gguzelwxgggm8j1XfESXzdv1Id+gR3KvPb2ccw2qvUTHm1xxd uGWrg62xzQmcgvNjb15vEUhC4= X-QQ-GoodBg: 0 From: ChenGuanqiao To: hirofumi@mail.parknet.co.jp Cc: linux-kernel@vger.kernel.org, ChenGuanqiao Subject: [PATCH v6 2/3] fs: fat: Add volume label entry method function Date: Tue, 2 Jan 2018 14:42:28 +0800 Message-Id: <20180102064229.25202-3-chen.chenchacha@foxmail.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180102064229.25202-1-chen.chenchacha@foxmail.com> References: <20180102064229.25202-1-chen.chenchacha@foxmail.com> X-QQ-SENDSIZE: 520 X-QQ-FName: E988B56064344F578A74B46210AC66D3 X-QQ-LocalIP: 10.208.130.95 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: Signed-off-by: ChenGuanqiao --- fs/fat/dir.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) diff --git a/fs/fat/dir.c b/fs/fat/dir.c index 81cecbe6d7cf..63aab656c08e 100644 --- a/fs/fat/dir.c +++ b/fs/fat/dir.c @@ -881,6 +881,68 @@ static int fat_get_short_entry(struct inode *dir, loff_t *pos, return -ENOENT; } +static int fat_get_volume_label_entry(struct inode *dir, loff_t *pos, + struct buffer_head **bh, + struct msdos_dir_entry **de) +{ + while (fat_get_entry(dir, pos, bh, de) >= 0) { + if (((*de)->attr & ATTR_VOLUME) && (*de)->attr != ATTR_EXT) + return 0; + } + return -ENOENT; +} + +int fat_scan_volume_label(struct inode *dir, struct buffer_head **bh, + struct msdos_dir_entry **de) +{ + loff_t offset = 0; + + if (dir->i_ino != MSDOS_ROOT_INO) + return -EINVAL; + + *bh = NULL; + *de = NULL; + while (fat_get_volume_label_entry(dir, &offset, bh, de) >= 0) + return 0; + + return -ENOENT; +} +EXPORT_SYMBOL_GPL(fat_scan_volume_label); + +int fat_add_volume_label_entry(struct inode *dir, const unsigned char *name, + struct timespec *ts) +{ + struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); + struct msdos_dir_entry de; + struct fat_slot_info sinfo; + __le16 time, date; + int err; + + if (dir->i_ino != MSDOS_ROOT_INO) + return -EINVAL; + + memcpy(de.name, name, MSDOS_NAME); + de.attr = ATTR_VOLUME; + de.lcase = 0; + fat_time_unix2fat(sbi, ts, &time, &date, NULL); + de.cdate = de.adate = 0; + de.ctime = 0; + de.ctime_cs = 0; + de.time = time; + de.date = date; + fat_set_start(&de, 0); + de.size = 0; + + err = fat_add_entries(dir, &de, 1, &sinfo); + if (err) + return err; + + dir->i_ctime = dir->i_mtime = *ts; + + return fat_sync_inode(dir); +} +EXPORT_SYMBOL_GPL(fat_add_volume_label_entry); + /* * The ".." entry can not provide the "struct fat_slot_info" information * for inode, nor a usable i_pos. So, this function provides some information -- 2.11.0