Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752858AbeAQKrr (ORCPT + 1 other); Wed, 17 Jan 2018 05:47:47 -0500 Received: from smtpbgsg2.qq.com ([54.254.200.128]:60309 "EHLO smtpbgsg2.qq.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752770AbeAQKrF (ORCPT ); Wed, 17 Jan 2018 05:47:05 -0500 X-QQ-mid: esmtp27t1516186018t8v85r0d3 X-QQ-SSF: A1000000000000709H110500000000P X-QQ-FEAT: oIoGrveFQB8taUJYR+2r2hSE8J3oCPGR/ekjdWlOzMKwS0yQXDnFnmNprefZt 8cPlIPASlYNs6LyRJj9FkBVvIMTsOFULkIFnGvIEjYRuheft+q8aW8drfubUeDPDv4UZ60s KnnElizD354umrpDFSoWxGIuJz1TJ+F5K1b7jOWeOkhwpR0kBMvXXVziJZIWRIMPph1PJRt 3rQjWq9LkpryJN0yWv59iEQ5jkMy7yomgfhP8gMRKhmK7OLH+4BuvloDmUGSsyBSFgs3N3l gxUHbsbtPbEzz475yPMg3O4l0= X-QQ-GoodBg: 0 From: ChenGuanqiao To: hirofumi@mail.parknet.co.jp Cc: linux-kernel@vger.kernel.org, ChenGuanqiao Subject: [PATCH 2/3] fs: fat: Add volume label entry method function Date: Wed, 17 Jan 2018 18:43:54 +0800 Message-Id: <20180117104355.889-3-chen.chenchacha@foxmail.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180117104355.889-1-chen.chenchacha@foxmail.com> References: <20180117104355.889-1-chen.chenchacha@foxmail.com> X-QQ-SENDSIZE: 520 Feedback-ID: esmtp:foxmail.com:bgforeign:bgforeign3 X-QQ-Bgrelay: 1 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 | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/fs/fat/dir.c b/fs/fat/dir.c index 8e100c3bf72c..d5286402c829 100644 --- a/fs/fat/dir.c +++ b/fs/fat/dir.c @@ -881,6 +881,53 @@ static int fat_get_short_entry(struct inode *dir, loff_t *pos, return -ENOENT; } +int fat_get_volume_label_entry(struct inode *dir, struct buffer_head **bh, + struct msdos_dir_entry **de) +{ + loff_t pos = 0; + + *bh = NULL; + *de = NULL; + while (fat_get_entry(dir, &pos, bh, de) >= 0) { + if (((*de)->attr & ATTR_VOLUME) && ((*de)->attr != ATTR_EXT) && + !IS_FREE((*de)->name)) + return 0; + } + return -ENOENT; +} +EXPORT_SYMBOL_GPL(fat_get_volume_label_entry); + +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; + + 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; + + brelse(sinfo.bh); + + return 0; +} +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