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CAPI: Pin capifs instead of mounting it 

Auto-mounting the capifs during module init prevents unloading its
module. Instead, pin the filesystem as long as some NCCI node exists.

Signed-off-by: Jan Kiszka <jan.kiszka@web.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jan Kiszka 2010-02-08 10:12:08 +00:00 committed by David S. Miller
parent 07ad603ab8
commit e11e7ac1ec
1 changed files with 18 additions and 9 deletions
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27
drivers/isdn/capi/capifs.c
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@ -32,6 +32,7 @@ static char *revision = "$Revision: 1.1.2.3 $";
#define CAPIFS_SUPER_MAGIC (('C'<<8)|'N')
static struct vfsmount *capifs_mnt;
static int capifs_mnt_count;
static struct {
int setuid;
@ -140,7 +141,7 @@ static struct file_system_type capifs_fs_type = {
.kill_sb = kill_anon_super,
};
struct dentry *capifs_new_ncci(unsigned int number, dev_t device)
static struct dentry *new_ncci(unsigned int number, dev_t device)
{
struct super_block *s = capifs_mnt->mnt_sb;
struct dentry *root = s->s_root;
@ -187,6 +188,20 @@ unlock_out:
return dentry;
}
struct dentry *capifs_new_ncci(unsigned int number, dev_t device)
{
struct dentry *dentry;
if (simple_pin_fs(&capifs_fs_type, &capifs_mnt, &capifs_mnt_count) < 0)
return NULL;
dentry = new_ncci(number, device);
if (!dentry)
simple_release_fs(&capifs_mnt, &capifs_mnt_count);
return dentry;
}
void capifs_free_ncci(struct dentry *dentry)
{
struct dentry *root = capifs_mnt->mnt_sb->s_root;
@ -206,6 +221,8 @@ void capifs_free_ncci(struct dentry *dentry)
dput(dentry);
mutex_unlock(&root->d_inode->i_mutex);
simple_release_fs(&capifs_mnt, &capifs_mnt_count);
}
static int __init capifs_init(void)
@ -222,13 +239,6 @@ static int __init capifs_init(void)
strcpy(rev, "1.0");
err = register_filesystem(&capifs_fs_type);
if (!err) {
capifs_mnt = kern_mount(&capifs_fs_type);
if (IS_ERR(capifs_mnt)) {
err = PTR_ERR(capifs_mnt);
unregister_filesystem(&capifs_fs_type);
}
}
if (!err)
printk(KERN_NOTICE "capifs: Rev %s\n", rev);
return err;
@ -237,7 +247,6 @@ static int __init capifs_init(void)
static void __exit capifs_exit(void)
{
unregister_filesystem(&capifs_fs_type);
mntput(capifs_mnt);
}
EXPORT_SYMBOL(capifs_new_ncci);