ocfs2: adjust minlen with discard_granularity in the FITRIM ioctl

Adjust minlen with discard_granularity for FITRIM ioctl(2) if the given
minimum size in bytes is less than it because, discard granularity is used
to tell us that the minimum size of extent that can be discarded by the
storage device.

This is inspired by ext4 commit 5c2ed62fd4 ("ext4: Adjust minlen with
discard_granularity in the FITRIM ioctl") from Lukas Czerner.

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 4de6a2af592fc1c2842924beac6bc04fa2adccbd..8ca3c29accbf08f2d7d40aaf53afcee6563a7322 100644 (file)
--- a/fs/ocfs2/ioctl.c
+++ b/fs/ocfs2/ioctl.c
@@ -980,6 +980,8 @@ long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
                if (copy_from_user(&range, argp, sizeof(range)))
                        return -EFAULT;
 
+               range.minlen = max_t(u64, q->limits.discard_granularity,
+                                    range.minlen);
                ret = ocfs2_trim_fs(sb, &range);
                if (ret < 0)
                        return ret;