[PATCH] Always print out the header line in /proc/swaps

[Suleiman Souhlal <ssouhlal@FreeBSD.org>]

It would be possible for /proc/swaps to not always print out the header:

swapon /dev/hdc2
swapon /dev/hde2
swapoff /dev/hdc2

At this point /proc/swaps would not have a header.

Signed-off-by: Suleiman Souhlal <suleiman@google.com>
---
mm/swapfile.c |   22 +++++++++++++++++-----
1 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index a15def6..8e206ce 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1274,10 +1274,13 @@ static void *swap_start(struct seq_file 

	mutex_lock(&swapon_mutex);

+	if (!l)
+		return SEQ_START_TOKEN;
+
	for (i = 0; i < nr_swapfiles; i++, ptr++) {
		if (!(ptr->flags & SWP_USED) || !ptr->swap_map)
			continue;
-		if (!l--)
+		if (!--l)
			return ptr;
	}

@@ -1286,10 +1289,17 @@ static void *swap_start(struct seq_file 

static void *swap_next(struct seq_file *swap, void *v, loff_t *pos)
{
-	struct swap_info_struct *ptr = v;
+	struct swap_info_struct *ptr;
	struct swap_info_struct *endptr = swap_info + nr_swapfiles;

-	for (++ptr; ptr < endptr; ptr++) {
+	if (v == SEQ_START_TOKEN)
+		ptr = swap_info;
+	else {
+		ptr = v;
+		ptr++;
+	}
+
+	for (; ptr < endptr; ptr++) {
		if (!(ptr->flags & SWP_USED) || !ptr->swap_map)
			continue;
		++*pos;
@@ -1310,8 +1320,10 @@ static int swap_show(struct seq_file *sw
	struct file *file;
	int len;

-	if (v == swap_info)
-		seq_puts(swap, "Filename\t\t\t\tType\t\tSize\tUsed\tPriority\n");
+	if (ptr == SEQ_START_TOKEN) {
+		seq_puts(swap,"Filename\t\t\t\tType\t\tSize\tUsed\tPriority\n");
+		return 0;
+	}

	file = ptr->swap_file;
	len = seq_path(swap, file->f_vfsmnt, file->f_dentry, " \t\n\\");


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