{NET,IB}/mlx4: Add rmap support to mlx4_assign_eq

[firefly-linux-kernel-4.4.55.git] / fs / pipe.c

diff --git a/fs/pipe.c b/fs/pipe.c
index 25feaa3faac068eba842438f9171f78ff189d7f8..49c1065256fd10d9d5fdca3cf449b1e56bd58a0a 100644 (file)
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -346,6 +346,16 @@ static const struct pipe_buf_operations anon_pipe_buf_ops = {
        .get = generic_pipe_buf_get,
 };
 
+static const struct pipe_buf_operations packet_pipe_buf_ops = {
+       .can_merge = 0,
+       .map = generic_pipe_buf_map,
+       .unmap = generic_pipe_buf_unmap,
+       .confirm = generic_pipe_buf_confirm,
+       .release = anon_pipe_buf_release,
+       .steal = generic_pipe_buf_steal,
+       .get = generic_pipe_buf_get,
+};
+
 static ssize_t
 pipe_read(struct kiocb *iocb, const struct iovec *_iov,
           unsigned long nr_segs, loff_t pos)
@@ -407,6 +417,13 @@ redo:
                        ret += chars;
                        buf->offset += chars;
                        buf->len -= chars;
+
+                       /* Was it a packet buffer? Clean up and exit */
+                       if (buf->flags & PIPE_BUF_FLAG_PACKET) {
+                               total_len = chars;
+                               buf->len = 0;
+                       }
+
                        if (!buf->len) {
                                buf->ops = NULL;
                                ops->release(pipe, buf);
@@ -459,6 +476,11 @@ redo:
        return ret;
 }
 
+static inline int is_packetized(struct file *file)
+{
+       return (file->f_flags & O_DIRECT) != 0;
+}
+
 static ssize_t
 pipe_write(struct kiocb *iocb, const struct iovec *_iov,
            unsigned long nr_segs, loff_t ppos)
@@ -593,6 +615,11 @@ redo2:
                        buf->ops = &anon_pipe_buf_ops;
                        buf->offset = 0;
                        buf->len = chars;
+                       buf->flags = 0;
+                       if (is_packetized(filp)) {
+                               buf->ops = &packet_pipe_buf_ops;
+                               buf->flags = PIPE_BUF_FLAG_PACKET;
+                       }
                        pipe->nrbufs = ++bufs;
                        pipe->tmp_page = NULL;
 
@@ -627,8 +654,11 @@ out:
                wake_up_interruptible_sync_poll(&pipe->wait, POLLIN | POLLRDNORM);
                kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
        }
-       if (ret > 0)
-               file_update_time(filp);
+       if (ret > 0) {
+               int err = file_update_time(filp);
+               if (err)
+                       ret = err;
+       }
        return ret;
 }
 
@@ -666,7 +696,7 @@ static long pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 
                        return put_user(count, (int __user *)arg);
                default:
-                       return -EINVAL;
+                       return -ENOIOCTLCMD;
        }
 }
 
@@ -1013,7 +1043,7 @@ struct file *create_write_pipe(int flags)
                goto err_dentry;
        f->f_mapping = inode->i_mapping;
 
-       f->f_flags = O_WRONLY | (flags & O_NONBLOCK);
+       f->f_flags = O_WRONLY | (flags & (O_NONBLOCK | O_DIRECT));
        f->f_version = 0;
 
        return f;
@@ -1057,7 +1087,7 @@ int do_pipe_flags(int *fd, int flags)
        int error;
        int fdw, fdr;
 
-       if (flags & ~(O_CLOEXEC | O_NONBLOCK))
+       if (flags & ~(O_CLOEXEC | O_NONBLOCK | O_DIRECT))
                return -EINVAL;
 
        fw = create_write_pipe(flags);