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proc: add a proc_create_reg helper 

Common code for creating a regular file.  Factor out of proc_create_data, to
be reused by other functions soon.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2018-04-24 17:08:36 +02:00
parent 61172eaea1
commit 7aed53d1df
2 changed files with 27 additions and 19 deletions
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44
fs/proc/generic.c
View File

@ -511,33 +511,39 @@ struct proc_dir_entry *proc_create_mount_point(const char *name)
}
EXPORT_SYMBOL(proc_create_mount_point);
struct proc_dir_entry *proc_create_data(const char *name, umode_t mode,
struct proc_dir_entry *parent,
const struct file_operations *proc_fops,
void *data)
struct proc_dir_entry *proc_create_reg(const char *name, umode_t mode,
struct proc_dir_entry **parent, void *data)
{
struct proc_dir_entry *pde;
struct proc_dir_entry *p;
if ((mode & S_IFMT) == 0)
mode |= S_IFREG;
if (!S_ISREG(mode)) {
WARN_ON(1); /* use proc_mkdir() */
if ((mode & S_IALLUGO) == 0)
mode |= S_IRUGO;
if (WARN_ON_ONCE(!S_ISREG(mode)))
return NULL;
p = __proc_create(parent, name, mode, 1);
if (p) {
p->proc_iops = &proc_file_inode_operations;
p->data = data;
}
return p;
}
struct proc_dir_entry *proc_create_data(const char *name, umode_t mode,
struct proc_dir_entry *parent,
const struct file_operations *proc_fops, void *data)
{
struct proc_dir_entry *p;
BUG_ON(proc_fops == NULL);
if ((mode & S_IALLUGO) == 0)
mode |= S_IRUGO;
pde = __proc_create(&parent, name, mode, 1);
if (!pde)
goto out;
pde->proc_fops = proc_fops;
pde->data = data;
pde->proc_iops = &proc_file_inode_operations;
return proc_register(parent, pde);
out:
return NULL;
p = proc_create_reg(name, mode, &parent, data);
if (!p)
return NULL;
p->proc_fops = proc_fops;
return proc_register(parent, p);
}
EXPORT_SYMBOL(proc_create_data);

2
fs/proc/internal.h
View File

@ -162,6 +162,8 @@ extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, i
/*
* generic.c
*/
struct proc_dir_entry *proc_create_reg(const char *name, umode_t mode,
struct proc_dir_entry **parent, void *data);
struct proc_dir_entry *proc_register(struct proc_dir_entry *dir,
struct proc_dir_entry *dp);
extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);