dentry.c

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#include <linux/dcache.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/fs_stack.h>
#include <linux/slab.h>
#include "ecryptfs_kernel.h"

static int ecryptfs_d_revalidate(struct dentry *dentry, unsigned int flags)
{
    struct dentry *lower_dentry;
    struct vfsmount *lower_mnt;
    int rc = 1;

    if (flags & LOOKUP_RCU)
        return -ECHILD;

    lower_dentry = ecryptfs_dentry_to_lower(dentry);
    lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
    if (!lower_dentry->d_op || !lower_dentry->d_op->d_revalidate)
        goto out;
    rc = lower_dentry->d_op->d_revalidate(lower_dentry, flags);
    if (dentry->d_inode) {
        struct inode *lower_inode =
            ecryptfs_inode_to_lower(dentry->d_inode);

        fsstack_copy_attr_all(dentry->d_inode, lower_inode);
    }
out:
    return rc;
}

struct kmem_cache *ecryptfs_dentry_info_cache;

static void ecryptfs_d_release(struct dentry *dentry)
{
    if (ecryptfs_dentry_to_private(dentry)) {
        if (ecryptfs_dentry_to_lower(dentry)) {
            dput(ecryptfs_dentry_to_lower(dentry));
            mntput(ecryptfs_dentry_to_lower_mnt(dentry));
        }
        kmem_cache_free(ecryptfs_dentry_info_cache,
                ecryptfs_dentry_to_private(dentry));
    }
    return;
}

const struct dentry_operations ecryptfs_dops = {
    .d_revalidate = ecryptfs_d_revalidate,
    .d_release = ecryptfs_d_release,
};