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Commit dab5ca8f authored by Miklos Szeredi's avatar Miklos Szeredi
Browse files

ovl: add lsattr/chattr support 



Implement FS_IOC_GETFLAGS and FS_IOC_SETFLAGS.

Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent aab8848c

fs/overlayfs/file.c

+79 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 


#include <linux/cred.h>

#include <linux/file.h>

#include <linux/mount.h>

#include <linux/xattr.h>

#include <linux/uio.h>

#include "overlayfs.h"
@@ -309,6 +310,82 @@ static long ovl_fallocate(struct file *file, int mode, loff_t offset, loff_t len 
	return ret;

}



static long ovl_real_ioctl(struct file *file, unsigned int cmd,

			   unsigned long arg)

{

	struct fd real;

	const struct cred *old_cred;

	long ret;



	ret = ovl_real_fdget(file, &real);

	if (ret)

		return ret;



	old_cred = ovl_override_creds(file_inode(file)->i_sb);

	ret = vfs_ioctl(real.file, cmd, arg);

	revert_creds(old_cred);



	fdput(real);



	return ret;

}



static long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

{

	long ret;

	struct inode *inode = file_inode(file);



	switch (cmd) {

	case FS_IOC_GETFLAGS:

		ret = ovl_real_ioctl(file, cmd, arg);

		break;



	case FS_IOC_SETFLAGS:

		if (!inode_owner_or_capable(inode))

			return -EACCES;



		ret = mnt_want_write_file(file);

		if (ret)

			return ret;



		ret = ovl_copy_up(file_dentry(file));

		if (!ret) {

			ret = ovl_real_ioctl(file, cmd, arg);



			inode_lock(inode);

			ovl_copyflags(ovl_inode_real(inode), inode);

			inode_unlock(inode);

		}



		mnt_drop_write_file(file);

		break;



	default:

		ret = -ENOTTY;

	}



	return ret;

}



static long ovl_compat_ioctl(struct file *file, unsigned int cmd,

			     unsigned long arg)

{

	switch (cmd) {

	case FS_IOC32_GETFLAGS:

		cmd = FS_IOC_GETFLAGS;

		break;



	case FS_IOC32_SETFLAGS:

		cmd = FS_IOC_SETFLAGS;

		break;



	default:

		return -ENOIOCTLCMD;

	}



	return ovl_ioctl(file, cmd, arg);

}



const struct file_operations ovl_file_operations = {

	.open		= ovl_open,

	.release	= ovl_release,
@@ -318,4 +395,6 @@ const struct file_operations ovl_file_operations = { 
	.fsync		= ovl_fsync,

	.mmap		= ovl_mmap,

	.fallocate	= ovl_fallocate,

	.unlocked_ioctl	= ovl_ioctl,

	.compat_ioctl	= ovl_compat_ioctl,

};