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-rw-r--r--fs/ocfs2/stack_user.c19
1 files changed, 5 insertions, 14 deletions
diff --git a/fs/ocfs2/stack_user.c b/fs/ocfs2/stack_user.c
index c021280dd462..24e0b19c8b69 100644
--- a/fs/ocfs2/stack_user.c
+++ b/fs/ocfs2/stack_user.c
@@ -549,26 +549,17 @@ static ssize_t ocfs2_control_read(struct file *file,
size_t count,
loff_t *ppos)
{
- char *proto_string = OCFS2_CONTROL_PROTO;
- size_t to_write = 0;
-
- if (*ppos >= OCFS2_CONTROL_PROTO_LEN)
- return 0;
-
- to_write = OCFS2_CONTROL_PROTO_LEN - *ppos;
- if (to_write > count)
- to_write = count;
- if (copy_to_user(buf, proto_string + *ppos, to_write))
- return -EFAULT;
+ ssize_t ret;
- *ppos += to_write;
+ ret = simple_read_from_buffer(buf, count, ppos,
+ OCFS2_CONTROL_PROTO, OCFS2_CONTROL_PROTO_LEN);
/* Have we read the whole protocol list? */
- if (*ppos >= OCFS2_CONTROL_PROTO_LEN)
+ if (ret > 0 && *ppos >= OCFS2_CONTROL_PROTO_LEN)
ocfs2_control_set_handshake_state(file,
OCFS2_CONTROL_HANDSHAKE_READ);
- return to_write;
+ return ret;
}
static int ocfs2_control_release(struct inode *inode, struct file *file)