ocfs2: return EOPNOTSUPP if the device does not support discard

For FITRIM ioctl(2), we should return EOPNOTSUPP to inform the user that
the storage device does not support discard if it is, otherwise return
success would confuse the user even though there is no free blocks were
trimmed at all.

Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
index fa32ce9b455df9ad7ff06e812ad79eb8f42a4e4b..4de6a2af592fc1c2842924beac6bc04fa2adccbd 100644 (file)
--- a/fs/ocfs2/ioctl.c
+++ b/fs/ocfs2/ioctl.c
@@ -7,6 +7,7 @@
 
 #include <linux/fs.h>
 #include <linux/mount.h>
+#include <linux/blkdev.h>
 #include <linux/compat.h>
 
 #include <cluster/masklog.h>
@@ -966,12 +967,16 @@ long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
        case FITRIM:
        {
                struct super_block *sb = inode->i_sb;
+               struct request_queue *q = bdev_get_queue(sb->s_bdev);
                struct fstrim_range range;
                int ret = 0;
 
                if (!capable(CAP_SYS_ADMIN))
                        return -EPERM;
 
+               if (!blk_queue_discard(q))
+                       return -EOPNOTSUPP;
+
                if (copy_from_user(&range, argp, sizeof(range)))
                        return -EFAULT;