[PATCH] pipe: remove redundant fifo_poll abstraction

Remove a redundant fifo_poll() abstraction from fs/pipe.c and adds a big
fat comment stating we set POLLERR for FIFOs too on Linux unlike most
Unices.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/pipe.c b/fs/pipe.c
index 25aa09f9d09d08ce5c29738406bae6d5e27d8843..2c7a23dde2d83f1ae18190e5723c0eb8d8ae0548 100644 (file)
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -415,6 +415,10 @@ pipe_poll(struct file *filp, poll_table *wait)
 
        if (filp->f_mode & FMODE_WRITE) {
                mask |= (nrbufs < PIPE_BUFFERS) ? POLLOUT | POLLWRNORM : 0;
+               /*
+                * Most Unices do not set POLLERR for FIFOs but on Linux they
+                * behave exactly like pipes for poll().
+                */
                if (!PIPE_READERS(*inode))
                        mask |= POLLERR;
        }
@@ -422,9 +426,6 @@ pipe_poll(struct file *filp, poll_table *wait)
        return mask;
 }
 
-/* FIXME: most Unices do not set POLLERR for fifos */
-#define fifo_poll pipe_poll
-
 static int
 pipe_release(struct inode *inode, int decr, int decw)
 {
@@ -568,7 +569,7 @@ struct file_operations read_fifo_fops = {
        .read           = pipe_read,
        .readv          = pipe_readv,
        .write          = bad_pipe_w,
-       .poll           = fifo_poll,
+       .poll           = pipe_poll,
        .ioctl          = pipe_ioctl,
        .open           = pipe_read_open,
        .release        = pipe_read_release,
@@ -580,7 +581,7 @@ struct file_operations write_fifo_fops = {
        .read           = bad_pipe_r,
        .write          = pipe_write,
        .writev         = pipe_writev,
-       .poll           = fifo_poll,
+       .poll           = pipe_poll,
        .ioctl          = pipe_ioctl,
        .open           = pipe_write_open,
        .release        = pipe_write_release,
@@ -593,7 +594,7 @@ struct file_operations rdwr_fifo_fops = {
        .readv          = pipe_readv,
        .write          = pipe_write,
        .writev         = pipe_writev,
-       .poll           = fifo_poll,
+       .poll           = pipe_poll,
        .ioctl          = pipe_ioctl,
        .open           = pipe_rdwr_open,
        .release        = pipe_rdwr_release,