Commit 1abe77b0 authored by Al Viro's avatar Al Viro Committed by Linus Torvalds
Browse files

[PATCH] allow callers of seq_open do allocation themselves

Allow caller of seq_open() to kmalloc() seq_file + whatever else they
want and set ->private_data to it.  seq_open() will then abstain from
doing allocation itself.
Signed-off-by: default avatarAl Viro <>
Signed-off-by: default avatarLinus Torvalds <>
parent ccd48bc7
......@@ -28,13 +28,17 @@
int seq_open(struct file *file, struct seq_operations *op)
struct seq_file *p = kmalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return -ENOMEM;
struct seq_file *p = file->private_data;
if (!p) {
p = kmalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return -ENOMEM;
file->private_data = p;
memset(p, 0, sizeof(*p));
sema_init(&p->sem, 1);
p->op = op;
file->private_data = p;
* Wrappers around seq_open(e.g. swaps_open) need to be
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