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[FS] seq_file: Introduce the seq_open_private()

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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>
This commit is contained in:
Pavel Emelyanov 2007-10-10 02:28:42 -07:00 committed by David S. Miller
parent 59e90b2d22
commit 39699037a5
2 changed files with 35 additions and 0 deletions
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33
fs/seq_file.c
View File

@ -429,6 +429,39 @@ int seq_release_private(struct inode *inode, struct file *file)
} }
EXPORT_SYMBOL(seq_release_private); 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) int seq_putc(struct seq_file *m, char c)
{ {
if (m->count < m->size) { if (m->count < m->size) {

2
include/linux/seq_file.h
View File

@ -46,6 +46,8 @@ int seq_path(struct seq_file *, struct vfsmount *, struct dentry *, char *);
int single_open(struct file *, int (*)(struct seq_file *, void *), void *); int single_open(struct file *, int (*)(struct seq_file *, void *), void *);
int single_release(struct inode *, struct file *); int single_release(struct inode *, struct file *);
void *__seq_open_private(struct file *, const struct seq_operations *, int);
int seq_open_private(struct file *, const struct seq_operations *, int);
int seq_release_private(struct inode *, struct file *); int seq_release_private(struct inode *, struct file *);
#define SEQ_START_TOKEN ((void *)1) #define SEQ_START_TOKEN ((void *)1)