Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755639AbeAJKYe (ORCPT + 1 other); Wed, 10 Jan 2018 05:24:34 -0500 Received: from smtpbguseast2.qq.com ([54.204.34.130]:55167 "EHLO smtpbguseast2.qq.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753096AbeAJKYb (ORCPT ); Wed, 10 Jan 2018 05:24:31 -0500 X-QQ-mid: esmtp15t1515579865taaxolzap X-QQ-SSF: A1000000000000706H110000000000P X-QQ-FEAT: yN/dV50aaV+AYgLNvcr0VxWjLhZI1z1gkdSfnkJUm3Qf21Gpa0Xn+UnYtDOjy CARS2BlniIabU8c1hoNffSsLQ68gnfqgUUSbKP2vRad/eUxii4S10Wv1HkjevNmxYwRLgpT s2dj9bG/6rKNUO2C3CR6wjlHxiPbISuLeRbOds2PzTNkAhsee59uWMrF+7yURMkNDm7OHDU kMrow3EwsoW8EBOJ45qSgJ7SLZQHgiF3nTN5GqoTOtclbkfA3bHSqnuvRs9FZ8+JElKhn7h /5xYH+trxIO059xCGwyYbmJQg= X-QQ-GoodBg: 0 From: ChenGuanqiao To: hirofumi@mail.parknet.co.jp Cc: linux-kernel@vger.kernel.org, ChenGuanqiao Subject: [PATCH v7 1/3] fs: fat: Add fat filesystem partition volume label in local structure Date: Wed, 10 Jan 2018 18:21:51 +0800 Message-Id: <20180110102153.12388-2-chen.chenchacha@foxmail.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180110102153.12388-1-chen.chenchacha@foxmail.com> References: <20180110102153.12388-1-chen.chenchacha@foxmail.com> X-QQ-SENDSIZE: 520 Feedback-ID: esmtp:foxmail.com:bgforeign:bgforeign1 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/fat.h | 6 ++++++ fs/fat/inode.c | 15 ++++++++++++--- include/uapi/linux/msdos_fs.h | 2 ++ 3 files changed, 20 insertions(+), 3 deletions(-) diff --git a/fs/fat/fat.h b/fs/fat/fat.h index 8fc1093da47d..96f631282c71 100644 --- a/fs/fat/fat.h +++ b/fs/fat/fat.h @@ -86,6 +86,7 @@ struct msdos_sb_info { int dir_per_block; /* dir entries per block */ int dir_per_block_bits; /* log2(dir_per_block) */ unsigned int vol_id; /*volume ID*/ + char vol_label[11]; /*volume label*/ int fatent_shift; const struct fatent_operations *fatent_ops; @@ -300,6 +301,11 @@ extern int fat_dir_empty(struct inode *dir); extern int fat_subdirs(struct inode *dir); extern int fat_scan(struct inode *dir, const unsigned char *name, struct fat_slot_info *sinfo); +extern int fat_get_volume_label_entry(struct inode *dir, struct buffer_head **bh, + struct msdos_dir_entry **de); +extern int fat_add_volume_label_entry(struct inode*dir, + const unsigned char *name, + struct timespec *ts); extern int fat_scan_logstart(struct inode *dir, int i_logstart, struct fat_slot_info *sinfo); extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, diff --git a/fs/fat/inode.c b/fs/fat/inode.c index ffbbf0520d9e..b76d783138fd 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -46,12 +46,14 @@ struct fat_bios_param_block { u8 fat16_state; u32 fat16_vol_id; + u8 fat16_vol_label[11]; u32 fat32_length; u32 fat32_root_cluster; u16 fat32_info_sector; u8 fat32_state; u32 fat32_vol_id; + u8 fat32_vol_label[11]; }; static int fat_default_codepage = CONFIG_FAT_DEFAULT_CODEPAGE; @@ -1461,12 +1463,16 @@ static int fat_read_bpb(struct super_block *sb, struct fat_boot_sector *b, bpb->fat16_state = b->fat16.state; bpb->fat16_vol_id = get_unaligned_le32(b->fat16.vol_id); + memcpy(bpb->fat16_vol_label, b->fat16.vol_label, + sizeof(bpb->fat16_vol_label)); bpb->fat32_length = le32_to_cpu(b->fat32.length); bpb->fat32_root_cluster = le32_to_cpu(b->fat32.root_cluster); bpb->fat32_info_sector = le16_to_cpu(b->fat32.info_sector); bpb->fat32_state = b->fat32.state; bpb->fat32_vol_id = get_unaligned_le32(b->fat32.vol_id); + memcpy(bpb->fat32_vol_label, b->fat32.vol_label, + sizeof(bpb->fat32_vol_label)); /* Validate this looks like a FAT filesystem BPB */ if (!bpb->fat_reserved) { @@ -1724,11 +1730,14 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat, brelse(fsinfo_bh); } - /* interpret volume ID as a little endian 32 bit integer */ - if (sbi->fat_bits == 32) + /* interpret volume ID and label as a little endian 32 bit integer */ + if (sbi->fat_bits == 32) { sbi->vol_id = bpb.fat32_vol_id; - else /* fat 16 or 12 */ + memcpy(sbi->vol_label, bpb.fat32_vol_label, sizeof(sbi->vol_label)); + } else { /* fat 16 or 12 */ sbi->vol_id = bpb.fat16_vol_id; + memcpy(sbi->vol_label, bpb.fat16_vol_label, sizeof(sbi->vol_label)); + } sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry); sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1; diff --git a/include/uapi/linux/msdos_fs.h b/include/uapi/linux/msdos_fs.h index a45d0754102e..90d2d6f3d908 100644 --- a/include/uapi/linux/msdos_fs.h +++ b/include/uapi/linux/msdos_fs.h @@ -107,6 +107,8 @@ struct __fat_dirent { #define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32) /*Android kernel has used 0x12, so we use 0x13*/ #define FAT_IOCTL_GET_VOLUME_ID _IOR('r', 0x13, __u32) +#define FAT_IOCTL_GET_VOLUME_LABEL _IOR('r', 0x14, __u8[11]) +#define FAT_IOCTL_SET_VOLUME_LABEL _IOW('r', 0x15, __u8[11]) struct fat_boot_sector { __u8 ignored[3]; /* Boot strap short or near jump */ -- 2.11.0