[FS] seq_file: Introduce the seq_open_private()

This function allocates the zeroed chunk of memory and
call seq_open(). The __seq_open_private() helper returns
the allocated memory to make it possible for the caller
to initialize it.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 33 insertions, 0 deletions

diff --git a/fs/seq_file.c b/fs/seq_file.c
index bbb19be260ce..ca71c115bdaa 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -429,6 +429,39 @@ int seq_release_private(struct inode *inode, struct file *file)
 }
 EXPORT_SYMBOL(seq_release_private);
 
+void *__seq_open_private(struct file *f, const struct seq_operations *ops,
+                int psize)
+{
+        int rc;
+        void *private;
+        struct seq_file *seq;
+
+        private = kzalloc(psize, GFP_KERNEL);
+        if (private == NULL)
+                goto out;
+
+        rc = seq_open(f, ops);
+        if (rc < 0)
+                goto out_free;
+
+        seq = f->private_data;
+        seq->private = private;
+        return private;
+
+out_free:
+        kfree(private);
+out:
+        return NULL;
+}
+EXPORT_SYMBOL(__seq_open_private);
+
+int seq_open_private(struct file *filp, const struct seq_operations *ops,
+                int psize)
+{
+        return __seq_open_private(filp, ops, psize) ? 0 : -ENOMEM;
+}
+EXPORT_SYMBOL(seq_open_private);
+
 int seq_putc(struct seq_file *m, char c)
 {
         if (m->count < m->size) {