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Subject[PATCH v9 2/3] fs: fat: Add volume label entry method function
Date
Signed-off-by: Chen Guanqiao <chen.chenchacha@foxmail.com>
---
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
--
2.14.3
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