diff options
Diffstat (limited to 'fs/devfs.c')
| -rw-r--r-- | fs/devfs.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/fs/devfs.c b/fs/devfs.c index d2b801036e..717e66c5dc 100644 --- a/fs/devfs.c +++ b/fs/devfs.c @@ -212,6 +212,32 @@ static const struct file_operations devfs_dir_operations; static const struct inode_operations devfs_dir_inode_operations; static const struct file_operations devfs_file_operations; +static int devfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) +{ + struct devfs_inode *dinode; + struct inode *inode; + struct cdev *cdev; + + cdev = cdev_by_name(dentry->name); + if (!cdev) + return -ENOENT; + + inode = d_inode(dentry); + if (!inode) + return 0; + + dinode = container_of(inode, struct devfs_inode, inode); + + if (dinode->cdev != cdev) + return 0; + + return 1; +} + +static const struct dentry_operations devfs_dentry_operations = { + .d_revalidate = devfs_lookup_revalidate, +}; + static struct inode *devfs_get_inode(struct super_block *sb, const struct inode *dir, umode_t mode) { @@ -290,6 +316,7 @@ static int devfs_probe(struct device_d *dev) struct super_block *sb = &fsdev->sb; sb->s_op = &devfs_ops; + sb->s_d_op = &devfs_dentry_operations; inode = devfs_get_inode(sb, NULL, S_IFDIR); sb->s_root = d_make_root(inode); |