[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>
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@ -429,6 +429,39 @@ int seq_release_private(struct inode *inode, struct file *file)
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}
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EXPORT_SYMBOL(seq_release_private);
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void *__seq_open_private(struct file *f, const struct seq_operations *ops,
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int psize)
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{
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int rc;
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void *private;
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struct seq_file *seq;
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private = kzalloc(psize, GFP_KERNEL);
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if (private == NULL)
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goto out;
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rc = seq_open(f, ops);
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if (rc < 0)
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goto out_free;
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seq = f->private_data;
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seq->private = private;
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return private;
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out_free:
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kfree(private);
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out:
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return NULL;
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}
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EXPORT_SYMBOL(__seq_open_private);
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int seq_open_private(struct file *filp, const struct seq_operations *ops,
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int psize)
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{
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return __seq_open_private(filp, ops, psize) ? 0 : -ENOMEM;
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}
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EXPORT_SYMBOL(seq_open_private);
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int seq_putc(struct seq_file *m, char c)
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{
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if (m->count < m->size) {
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@ -46,6 +46,8 @@ int seq_path(struct seq_file *, struct vfsmount *, struct dentry *, char *);
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int single_open(struct file *, int (*)(struct seq_file *, void *), void *);
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int single_release(struct inode *, struct file *);
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void *__seq_open_private(struct file *, const struct seq_operations *, int);
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int seq_open_private(struct file *, const struct seq_operations *, int);
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int seq_release_private(struct inode *, struct file *);
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#define SEQ_START_TOKEN ((void *)1)
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