4 files changed, 16 insertions, 25 deletions

diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index eb1cc92..908e184 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -110,7 +110,6 @@ struct autofs_sb_info {
 	int sub_version;
 	int min_proto;
 	int max_proto;
-	int compat_daemon;
 	unsigned long exp_timeout;
 	unsigned int type;
 	int reghost_enabled;
@@ -270,6 +269,17 @@ int autofs4_fill_super(struct super_block *, void *, int);
 struct autofs_info *autofs4_new_ino(struct autofs_sb_info *);
 void autofs4_clean_ino(struct autofs_info *);
 
+static inline int autofs_prepare_pipe(struct file *pipe)
+{
+	if (!pipe->f_op || !pipe->f_op->write)
+		return -EINVAL;
+	if (!S_ISFIFO(pipe->f_dentry->d_inode->i_mode))
+		return -EINVAL;
+	/* We want a packet pipe */
+	pipe->f_flags |= O_DIRECT;
+	return 0;
+}
+
 /* Queue management functions */
 
 int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify);
diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index 9dacb85..aa9103f 100644
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -376,7 +376,7 @@ static int autofs_dev_ioctl_setpipefd(struct file *fp,
 			err = -EBADF;
 			goto out;
 		}
-		if (!pipe->f_op || !pipe->f_op->write) {
+		if (autofs_prepare_pipe(pipe) < 0) {
 			err = -EPIPE;
 			fput(pipe);
 			goto out;
@@ -385,7 +385,6 @@ static int autofs_dev_ioctl_setpipefd(struct file *fp,
 		sbi->pipefd = pipefd;
 		sbi->pipe = pipe;
 		sbi->catatonic = 0;
-		sbi->compat_daemon = is_compat_task();
 	}
 out:
 	mutex_unlock(&sbi->wq_mutex);
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index d8dc002..6e488eb 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -19,7 +19,6 @@
 #include <linux/parser.h>
 #include <linux/bitops.h>
 #include <linux/magic.h>
-#include <linux/compat.h>
 #include "autofs_i.h"
 #include <linux/module.h>
 
@@ -225,7 +224,6 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
 	set_autofs_type_indirect(&sbi->type);
 	sbi->min_proto = 0;
 	sbi->max_proto = 0;
-	sbi->compat_daemon = is_compat_task();
 	mutex_init(&sbi->wq_mutex);
 	mutex_init(&sbi->pipe_mutex);
 	spin_lock_init(&sbi->fs_lock);
@@ -292,7 +290,7 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
 		printk("autofs: could not open pipe file descriptor\n");
 		goto fail_dput;
 	}
-	if (!pipe->f_op || !pipe->f_op->write)
+	if (autofs_prepare_pipe(pipe) < 0)
 		goto fail_fput;
 	sbi->pipe = pipe;
 	sbi->pipefd = pipefd;
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index 9c098db..da8876d 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -91,24 +91,7 @@ static int autofs4_write(struct autofs_sb_info *sbi,
 
 	return (bytes > 0);
 }
-
-/*
- * The autofs_v5 packet was misdesigned.
- *
- * The packets are identical on x86-32 and x86-64, but have different
- * alignment. Which means that 'sizeof()' will give different results.
- * Fix it up for the case of running 32-bit user mode on a 64-bit kernel.
- */
-static noinline size_t autofs_v5_packet_size(struct autofs_sb_info *sbi)
-{
-	size_t pktsz = sizeof(struct autofs_v5_packet);
-#if defined(CONFIG_X86_64) && defined(CONFIG_COMPAT)
-	if (sbi->compat_daemon > 0)
-		pktsz -= 4;
-#endif
-	return pktsz;
-}
-
+	
 static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
 				 struct autofs_wait_queue *wq,
 				 int type)
@@ -172,7 +155,8 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
 	{
 		struct autofs_v5_packet *packet = &pkt.v5_pkt.v5_packet;
 
-		pktsz = autofs_v5_packet_size(sbi);
+		pktsz = sizeof(*packet);
+
 		packet->wait_queue_token = wq->wait_queue_token;
 		packet->len = wq->name.len;
 		memcpy(packet->name, wq->name.name, wq->name.len);