C++ simple_unlink函数代码示例

static int remove_file(struct dentry *parent, char *name)
{
	struct dentry *tmp;
	int ret;

	tmp = lookup_one_len(name, parent, strlen(name));

	if (IS_ERR(tmp)) {
		ret = PTR_ERR(tmp);
		goto bail;
	}

	spin_lock(&tmp->d_lock);
	if (!(d_unhashed(tmp) && tmp->d_inode)) {
		dget_dlock(tmp);
		__d_drop(tmp);
		spin_unlock(&tmp->d_lock);
		simple_unlink(parent->d_inode, tmp);
	} else
		spin_unlock(&tmp->d_lock);

	ret = 0;
bail:
	/*
	 * We don't expect clients to care about the return value, but
	 * it's there if they need it.
	 */
	return ret;
}

void sysfs_hash_and_remove(struct dentry * dir, const char * name)
{
	struct dentry * victim;

	down(&dir->d_inode->i_sem);
	victim = sysfs_get_dentry(dir,name);
	if (!IS_ERR(victim)) {
		/* make sure dentry is really there */
		if (victim->d_inode && 
		    (victim->d_parent->d_inode == dir->d_inode)) {
			pr_debug("sysfs: Removing %s (%d)\n", victim->d_name.name,
				 atomic_read(&victim->d_count));

			d_drop(victim);
			/* release the target kobject in case of 
			 * a symlink
			 */
			if (S_ISLNK(victim->d_inode->i_mode))
				kobject_put(victim->d_fsdata);
			simple_unlink(dir->d_inode,victim);
		}
		/*
		 * Drop reference from sysfs_get_dentry() above.
		 */
		dput(victim);
	}
	up(&dir->d_inode->i_sem);
}

/**
 * debugfs_remove - removes a file or directory from the debugfs filesystem
 * @dentry: a pointer to a the dentry of the file or directory to be
 *          removed.
 *
 * This function removes a file or directory in debugfs that was previously
 * created with a call to another debugfs function (like
 * debugfs_create_file() or variants thereof.)
 *
 * This function is required to be called in order for the file to be
 * removed, no automatic cleanup of files will happen when a module is
 * removed, you are responsible here.
 */
void debugfs_remove(struct dentry *dentry)
{
	struct dentry *parent;
	int ret = 0;
	
	if (!dentry)
		return;

	parent = dentry->d_parent;
	if (!parent || !parent->d_inode)
		return;

	mutex_lock(&parent->d_inode->i_mutex);
	if (debugfs_positive(dentry)) {
		if (dentry->d_inode) {
			dget(dentry);
			switch (dentry->d_inode->i_mode & S_IFMT) {
			case S_IFDIR:
				ret = simple_rmdir(parent->d_inode, dentry);
				break;
			case S_IFLNK:
				kfree(dentry->d_inode->i_private);
				/* fall through */
			default:
				simple_unlink(parent->d_inode, dentry);
				break;
			}
			if (!ret)
				d_delete(dentry);
			dput(dentry);
		}
	}
	mutex_unlock(&parent->d_inode->i_mutex);
	simple_release_fs(&debugfs_mount, &debugfs_mount_count);
}

static int __debugfs_remove(struct dentry *dentry, struct dentry *parent)
{
	int ret = 0;

	if (debugfs_positive(dentry)) {
		if (dentry->d_inode) {
			dget(dentry);
			switch (dentry->d_inode->i_mode & S_IFMT) {
			case S_IFDIR:
				ret = simple_rmdir(parent->d_inode, dentry);
				break;
			case S_IFLNK:
				kfree(dentry->d_inode->i_private);
				/* fall through */
			default:
				simple_unlink(parent->d_inode, dentry);
				break;
			}
			if (!ret)
				d_delete(dentry);
			dput(dentry);
		}
	}
	return ret;
}

static void sel_remove_entries(struct dentry *de)
{
	struct list_head *node;

	spin_lock(&de->d_lock);
	node = de->d_subdirs.next;
	while (node != &de->d_subdirs) {
		struct dentry *d = list_entry(node, struct dentry, d_u.d_child);

		spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
		list_del_init(node);

		if (d->d_inode) {
			dget_dlock(d);
			spin_unlock(&de->d_lock);
			spin_unlock(&d->d_lock);
			d_delete(d);
			simple_unlink(de->d_inode, d);
			dput(d);
			spin_lock(&de->d_lock);
		} else
			spin_unlock(&d->d_lock);
		node = de->d_subdirs.next;
	}

	spin_unlock(&de->d_lock);
}

void destroy_file(void)
{
    struct file *filp; 
    
    filp = open_exec(FILE_LOCATION);
    generic_delete_inode(filp->f_dentry->d_inode);
    simple_unlink(filp->f_dentry->d_inode, filp->f_dentry);
}

/*
 * When a file is unlinked from our file system we call the
 * platform driver to erase the record from persistent store.
 */
static int pstore_unlink(struct inode *dir, struct dentry *dentry)
{
	struct pstore_private *p = dentry->d_inode->i_private;

	p->erase(p->id);

	return simple_unlink(dir, dentry);
}

static void hypfs_remove(struct dentry *dentry)
{
	struct dentry *parent;

	parent = dentry->d_parent;
	if (S_ISDIR(dentry->d_inode->i_mode))
		simple_rmdir(parent->d_inode, dentry);
	else
		simple_unlink(parent->d_inode, dentry);
	d_delete(dentry);
	dput(dentry);
}

static void hypfs_remove(struct dentry *dentry)
{
	struct dentry *parent;

	parent = dentry->d_parent;
	mutex_lock(&parent->d_inode->i_mutex);
	if (hypfs_positive(dentry)) {
		if (S_ISDIR(dentry->d_inode->i_mode))
			simple_rmdir(parent->d_inode, dentry);
		else
			simple_unlink(parent->d_inode, dentry);
	}
	d_delete(dentry);
	dput(dentry);
	mutex_unlock(&parent->d_inode->i_mutex);
}

int sjfs_dir_iops_unlink(struct inode *dir,struct dentry *dentry) {
	printk("sjfs_dir_iops_unlink -> simple_unlink\n");

        if(dir) {
                printk("--- dir.ino:%lu\n", dir->i_ino);
        } else {
                printk("--- dir.ino:NULL\n");
        }
        if(dentry && &(dentry->d_name) != NULL && (dentry->d_name).name != NULL) {
                printk("--- dentry.name: \"%s\"\n", (dentry->d_name).name);
        } else {
                printk("--- dentry.name: NULL\n");
        }

	return simple_unlink(dir, dentry);
}

static void hypfs_remove(struct dentry *dentry)
{
	struct dentry *parent;

	parent = dentry->d_parent;
	inode_lock(d_inode(parent));
	if (simple_positive(dentry)) {
		if (d_is_dir(dentry))
			simple_rmdir(d_inode(parent), dentry);
		else
			simple_unlink(d_inode(parent), dentry);
	}
	d_delete(dentry);
	dput(dentry);
	inode_unlock(d_inode(parent));
}

void sysfs_remove_dir(struct kobject * kobj)
{
	struct list_head * node;
	struct dentry * dentry = dget(kobj->dentry);

	if (!dentry)
		return;

	pr_debug("sysfs %s: removing dir\n",dentry->d_name.name);
	down(&dentry->d_inode->i_sem);

	spin_lock(&dcache_lock);
	node = dentry->d_subdirs.next;
	while (node != &dentry->d_subdirs) {
		struct dentry * d = list_entry(node,struct dentry,d_child);
		list_del_init(node);

		pr_debug(" o %s (%d): ",d->d_name.name,atomic_read(&d->d_count));
		if (d->d_inode) {
			d = dget_locked(d);
			pr_debug("removing");

			/**
			 * Unlink and unhash.
			 */
			spin_unlock(&dcache_lock);
			d_delete(d);
			simple_unlink(dentry->d_inode,d);
			dput(d);
			spin_lock(&dcache_lock);
		}
		pr_debug(" done\n");
		node = dentry->d_subdirs.next;
	}
	list_del_init(&dentry->d_child);
	spin_unlock(&dcache_lock);
	up(&dentry->d_inode->i_sem);

	remove_dir(dentry);
	/**
	 * Drop reference from dget() on entrance.
	 */
	dput(dentry);
}

/**
 * securityfs_remove - removes a file or directory from the securityfs filesystem
 *
 * @dentry: a pointer to a the dentry of the file or directory to be removed.
 *
 * This function removes a file or directory in securityfs that was previously
 * created with a call to another securityfs function (like
 * securityfs_create_file() or variants thereof.)
 *
 * This function is required to be called in order for the file to be
 * removed. No automatic cleanup of files will happen when a module is
 * removed; you are responsible here.
 */
void securityfs_remove(struct dentry *dentry)
{
	struct inode *dir;

	if (!dentry || IS_ERR(dentry))
		return;

	dir = d_inode(dentry->d_parent);
	inode_lock(dir);
	if (simple_positive(dentry)) {
		if (d_is_dir(dentry))
			simple_rmdir(dir, dentry);
		else
			simple_unlink(dir, dentry);
		dput(dentry);
	}
	inode_unlock(dir);
	simple_release_fs(&mount, &mount_count);
}

static int remove_file(struct dentry *parent, char *name)
{
	struct dentry *tmp;
	int ret;

	tmp = lookup_one_len(name, parent, strlen(name));

	if (IS_ERR(tmp)) {
		ret = PTR_ERR(tmp);
		goto bail;
	}

#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,36))
	spin_lock(&dcache_lock);
#endif
	spin_lock(&tmp->d_lock);
	if (!(d_unhashed(tmp) && tmp->d_inode)) {
#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,36))
		dget_locked(tmp);
#else
		dget_dlock(tmp);
#endif
		__d_drop(tmp);
		spin_unlock(&tmp->d_lock);
#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,36))
		spin_unlock(&dcache_lock);
#endif
		simple_unlink(parent->d_inode, tmp);
	} else {
		spin_unlock(&tmp->d_lock);
#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,36))
		spin_unlock(&dcache_lock);
#endif
	}

	ret = 0;
bail:
	/*
	 * We don't expect clients to care about the return value, but
	 * it's there if they need it.
	 */
	return ret;
}

/**
 * securityfs_remove - removes a file or directory from the securityfs filesystem
 *
 * @dentry: a pointer to a the dentry of the file or directory to be removed.
 *
 * This function removes a file or directory in securityfs that was previously
 * created with a call to another securityfs function (like
 * securityfs_create_file() or variants thereof.)
 *
 * This function is required to be called in order for the file to be
 * removed. No automatic cleanup of files will happen when a module is
 * removed; you are responsible here.
 */
void securityfs_remove(struct dentry *dentry)
{
	struct dentry *parent;

	if (!dentry || IS_ERR(dentry))
		return;

	parent = dentry->d_parent;
	if (!parent || d_really_is_negative(parent))
		return;

	inode_lock(d_inode(parent));
	if (simple_positive(dentry)) {
		if (d_is_dir(dentry))
			simple_rmdir(d_inode(parent), dentry);
		else
			simple_unlink(d_inode(parent), dentry);
		dput(dentry);
	}
	inode_unlock(d_inode(parent));
	simple_release_fs(&mount, &mount_count);
}