#include <linux/cred.h>
#include <linux/sched.h>
#include <linux/init_task.h>
+#include <linux/slab.h>
static struct vfsmount *dev_mnt;
static int dev_mount;
#endif
-static rwlock_t dirlock;
+static DEFINE_MUTEX(dirlock);
static int __init mount_param(char *str)
{
{
int err;
- read_lock(&dirlock);
+ mutex_lock(&dirlock);
err = dev_mkdir(nodepath, 0755);
if (err == -ENOENT) {
char *path;
/* parent directories do not exist, create them */
path = kstrdup(nodepath, GFP_KERNEL);
- if (!path)
- return -ENOMEM;
+ if (!path) {
+ err = -ENOMEM;
+ goto out;
+ }
s = path;
for (;;) {
s = strchr(s, '/');
}
kfree(path);
}
- read_unlock(&dirlock);
+out:
+ mutex_unlock(&dirlock);
return err;
}
if (!path)
return -ENOMEM;
- write_lock(&dirlock);
+ mutex_lock(&dirlock);
for (;;) {
char *base;
if (err)
break;
}
- write_unlock(&dirlock);
+ mutex_unlock(&dirlock);
kfree(path);
return err;
if (dentry->d_inode) {
err = vfs_getattr(nd.path.mnt, dentry, &stat);
if (!err && dev_mynode(dev, dentry->d_inode, &stat)) {
+ struct iattr newattrs;
+ /*
+ * before unlinking this node, reset permissions
+ * of possible references like hardlinks
+ */
+ newattrs.ia_uid = 0;
+ newattrs.ia_gid = 0;
+ newattrs.ia_mode = stat.mode & ~0777;
+ newattrs.ia_valid =
+ ATTR_UID|ATTR_GID|ATTR_MODE;
+ mutex_lock(&dentry->d_inode->i_mutex);
+ notify_change(dentry, &newattrs);
+ mutex_unlock(&dentry->d_inode->i_mutex);
err = vfs_unlink(nd.path.dentry->d_inode,
dentry);
if (!err || err == -ENOENT)
{
int err;
struct vfsmount *mnt;
-
- rwlock_init(&dirlock);
+ char options[] = "mode=0755";
err = register_filesystem(&dev_fs_type);
if (err) {
return err;
}
- mnt = kern_mount_data(&dev_fs_type, "mode=0755");
+ mnt = kern_mount_data(&dev_fs_type, options);
if (IS_ERR(mnt)) {
err = PTR_ERR(mnt);
printk(KERN_ERR "devtmpfs: unable to create devtmpfs %i\n", err);