hfs: atomically read inode size

See i_size_read() comments in include/linux/fs.h

Link: http://lkml.kernel.org/r/20170123175245.3272-1-fabf@skynet.be
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/hfs/mdb.c b/fs/hfs/mdb.c
index a3ec3ae7d34796877c2cfc7d08c631128569ca93..482081bcdf70c86da21f22ca1c443373b7327180 100644 (file)
--- a/fs/hfs/mdb.c
+++ b/fs/hfs/mdb.c
@@ -38,7 +38,7 @@ static int hfs_get_last_session(struct super_block *sb,
 
        /* default values */
        *start = 0;
-       *size = sb->s_bdev->bd_inode->i_size >> 9;
+       *size = i_size_read(sb->s_bdev->bd_inode) >> 9;
 
        if (HFS_SB(sb)->session >= 0) {
                te.cdte_track = HFS_SB(sb)->session;