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

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>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
hifive-unleashed-5.1
Suleiman Souhlal 2006-12-06 20:32:28 -08:00 committed by Linus Torvalds
parent b43a57bb4d
commit 881e4aabe4
1 changed files with 17 additions and 5 deletions
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22
mm/swapfile.c
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@ -1274,10 +1274,13 @@ static void *swap_start(struct seq_file *swap, loff_t *pos)
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 *swap, loff_t *pos)
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 *swap, void *v)
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\\");