[PATCH v9 2/3] fs: fat: Add volume label entry method function

[Chen Guanqiao]

Signed-off-by: Chen Guanqiao <chen.chencha...@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