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path: root/drivers/isdn/capi/capifs.c
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Diffstat (limited to 'drivers/isdn/capi/capifs.c')
-rw-r--r--drivers/isdn/capi/capifs.c126
1 files changed, 69 insertions, 57 deletions
diff --git a/drivers/isdn/capi/capifs.c b/drivers/isdn/capi/capifs.c
index 9f8f67b6c07f..8596bd1a4d26 100644
--- a/drivers/isdn/capi/capifs.c
+++ b/drivers/isdn/capi/capifs.c
@@ -25,14 +25,10 @@ MODULE_LICENSE("GPL");
/* ------------------------------------------------------------------ */
-static char *revision = "$Revision: 1.1.2.3 $";
-
-/* ------------------------------------------------------------------ */
-
#define CAPIFS_SUPER_MAGIC (('C'<<8)|'N')
static struct vfsmount *capifs_mnt;
-static struct dentry *capifs_root;
+static int capifs_mnt_count;
static struct {
int setuid;
@@ -118,7 +114,7 @@ capifs_fill_super(struct super_block *s, void *data, int silent)
inode->i_fop = &simple_dir_operations;
inode->i_nlink = 2;
- capifs_root = s->s_root = d_alloc_root(inode);
+ s->s_root = d_alloc_root(inode);
if (s->s_root)
return 0;
@@ -141,82 +137,98 @@ static struct file_system_type capifs_fs_type = {
.kill_sb = kill_anon_super,
};
-static struct dentry *get_node(int num)
+static struct dentry *new_ncci(unsigned int number, dev_t device)
{
- char s[10];
- struct dentry *root = capifs_root;
+ struct super_block *s = capifs_mnt->mnt_sb;
+ struct dentry *root = s->s_root;
+ struct dentry *dentry;
+ struct inode *inode;
+ char name[10];
+ int namelen;
+
mutex_lock(&root->d_inode->i_mutex);
- return lookup_one_len(s, root, sprintf(s, "%d", num));
-}
-void capifs_new_ncci(unsigned int number, dev_t device)
-{
- struct dentry *dentry;
- struct inode *inode = new_inode(capifs_mnt->mnt_sb);
- if (!inode)
- return;
- inode->i_ino = number+2;
+ namelen = sprintf(name, "%d", number);
+ dentry = lookup_one_len(name, root, namelen);
+ if (IS_ERR(dentry)) {
+ dentry = NULL;
+ goto unlock_out;
+ }
- dentry = get_node(number);
+ if (dentry->d_inode) {
+ dput(dentry);
+ dentry = NULL;
+ goto unlock_out;
+ }
+
+ inode = new_inode(s);
+ if (!inode) {
+ dput(dentry);
+ dentry = NULL;
+ goto unlock_out;
+ }
/* config contents is protected by root's i_mutex */
inode->i_uid = config.setuid ? config.uid : current_fsuid();
inode->i_gid = config.setgid ? config.gid : current_fsgid();
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
+ inode->i_ino = number + 2;
init_special_inode(inode, S_IFCHR|config.mode, device);
- //inode->i_op = &capifs_file_inode_operations;
- if (!IS_ERR(dentry) && !dentry->d_inode)
- d_instantiate(dentry, inode);
- mutex_unlock(&capifs_root->d_inode->i_mutex);
+ d_instantiate(dentry, inode);
+ dget(dentry);
+
+unlock_out:
+ mutex_unlock(&root->d_inode->i_mutex);
+
+ return dentry;
}
-void capifs_free_ncci(unsigned int number)
+struct dentry *capifs_new_ncci(unsigned int number, dev_t device)
{
- struct dentry *dentry = get_node(number);
-
- if (!IS_ERR(dentry)) {
- struct inode *inode = dentry->d_inode;
- if (inode) {
- inode->i_nlink--;
- d_delete(dentry);
- dput(dentry);
- }
+ 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;
+ struct inode *inode;
+
+ if (!dentry)
+ return;
+
+ mutex_lock(&root->d_inode->i_mutex);
+
+ inode = dentry->d_inode;
+ if (inode) {
+ drop_nlink(inode);
+ d_delete(dentry);
dput(dentry);
}
- mutex_unlock(&capifs_root->d_inode->i_mutex);
+ dput(dentry);
+
+ mutex_unlock(&root->d_inode->i_mutex);
+
+ simple_release_fs(&capifs_mnt, &capifs_mnt_count);
}
static int __init capifs_init(void)
{
- char rev[32];
- char *p;
- int err;
-
- if ((p = strchr(revision, ':')) != NULL && p[1]) {
- strlcpy(rev, p + 2, sizeof(rev));
- if ((p = strchr(rev, '$')) != NULL && p > rev)
- *(p-1) = 0;
- } else
- 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;
+ return register_filesystem(&capifs_fs_type);
}
static void __exit capifs_exit(void)
{
unregister_filesystem(&capifs_fs_type);
- mntput(capifs_mnt);
}
EXPORT_SYMBOL(capifs_new_ncci);