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Commit 2c1d0305 authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
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f2fs: support F2FS_IOC_FS{GET,SET}XATTR 



This patch adds FS_IOC_FSSETXATTR/FS_IOC_FSGETXATTR ioctl interface
support for f2fs. The interface is kept consistent with the one
of ext4/xfs.

Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent b6a245eb

fs/f2fs/f2fs.h

+3 −0
Original line number Diff line number Diff line
@@ -337,6 +337,9 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal, 
#define F2FS_IOC32_GETVERSION		FS_IOC32_GETVERSION

#endif



#define F2FS_IOC_FSGETXATTR		FS_IOC_FSGETXATTR

#define F2FS_IOC_FSSETXATTR		FS_IOC_FSSETXATTR



struct f2fs_gc_range {

	u32 sync;

	u64 start;

fs/f2fs/file.c

+236 −28
Original line number Diff line number Diff line
@@ -662,7 +662,7 @@ int f2fs_getattr(const struct path *path, struct kstat *stat, 
	struct f2fs_inode_info *fi = F2FS_I(inode);

	unsigned int flags;



	flags = fi->i_flags & FS_FL_USER_VISIBLE;

	flags = fi->i_flags & (FS_FL_USER_VISIBLE | FS_PROJINHERIT_FL);

	if (flags & FS_APPEND_FL)

		stat->attributes |= STATX_ATTR_APPEND;

	if (flags & FS_COMPR_FL)
@@ -1532,16 +1532,47 @@ static int f2fs_ioc_getflags(struct file *filp, unsigned long arg) 
{

	struct inode *inode = file_inode(filp);

	struct f2fs_inode_info *fi = F2FS_I(inode);

	unsigned int flags = fi->i_flags & FS_FL_USER_VISIBLE;

	unsigned int flags = fi->i_flags &

			(FS_FL_USER_VISIBLE | FS_PROJINHERIT_FL);

	return put_user(flags, (int __user *)arg);

}



static int __f2fs_ioc_setflags(struct inode *inode, unsigned int flags)

{

	struct f2fs_inode_info *fi = F2FS_I(inode);

	unsigned int oldflags;



	/* Is it quota file? Do not allow user to mess with it */

	if (IS_NOQUOTA(inode))

		return -EPERM;



	flags = f2fs_mask_flags(inode->i_mode, flags);



	oldflags = fi->i_flags;



	if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL))

		if (!capable(CAP_LINUX_IMMUTABLE))

			return -EPERM;



	flags = flags & (FS_FL_USER_MODIFIABLE | FS_PROJINHERIT_FL);

	flags |= oldflags & ~(FS_FL_USER_MODIFIABLE | FS_PROJINHERIT_FL);

	fi->i_flags = flags;



	if (fi->i_flags & FS_PROJINHERIT_FL)

		set_inode_flag(inode, FI_PROJ_INHERIT);

	else

		clear_inode_flag(inode, FI_PROJ_INHERIT);



	inode->i_ctime = current_time(inode);

	f2fs_set_inode_flags(inode);

	f2fs_mark_inode_dirty_sync(inode, false);

	return 0;

}



static int f2fs_ioc_setflags(struct file *filp, unsigned long arg)

{

	struct inode *inode = file_inode(filp);

	struct f2fs_inode_info *fi = F2FS_I(inode);

	unsigned int flags;

	unsigned int oldflags;

	int ret;



	if (!inode_owner_or_capable(inode))
@@ -1556,31 +1587,8 @@ static int f2fs_ioc_setflags(struct file *filp, unsigned long arg) 


	inode_lock(inode);



	/* Is it quota file? Do not allow user to mess with it */

	if (IS_NOQUOTA(inode)) {

		ret = -EPERM;

		goto unlock_out;

	}

	ret = __f2fs_ioc_setflags(inode, flags);



	flags = f2fs_mask_flags(inode->i_mode, flags);



	oldflags = fi->i_flags;



	if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {

		if (!capable(CAP_LINUX_IMMUTABLE)) {

			ret = -EPERM;

			goto unlock_out;

		}

	}



	flags = flags & FS_FL_USER_MODIFIABLE;

	flags |= oldflags & ~FS_FL_USER_MODIFIABLE;

	fi->i_flags = flags;



	inode->i_ctime = current_time(inode);

	f2fs_set_inode_flags(inode);

	f2fs_mark_inode_dirty_sync(inode, false);

unlock_out:

	inode_unlock(inode);

	mnt_drop_write_file(filp);

	return ret;
@@ -2416,6 +2424,200 @@ static int f2fs_ioc_get_features(struct file *filp, unsigned long arg) 
	return put_user(sb_feature, (u32 __user *)arg);

}



#ifdef CONFIG_QUOTA

static int f2fs_ioc_setproject(struct file *filp, __u32 projid)

{

	struct inode *inode = file_inode(filp);

	struct f2fs_inode_info *fi = F2FS_I(inode);

	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);

	struct super_block *sb = sbi->sb;

	struct dquot *transfer_to[MAXQUOTAS] = {};

	struct page *ipage;

	kprojid_t kprojid;

	int err;



	if (!f2fs_sb_has_project_quota(sb)) {

		if (projid != F2FS_DEF_PROJID)

			return -EOPNOTSUPP;

		else

			return 0;

	}



	if (!f2fs_has_extra_attr(inode))

		return -EOPNOTSUPP;



	kprojid = make_kprojid(&init_user_ns, (projid_t)projid);



	if (projid_eq(kprojid, F2FS_I(inode)->i_projid))

		return 0;



	err = mnt_want_write_file(filp);

	if (err)

		return err;



	err = -EPERM;

	inode_lock(inode);



	/* Is it quota file? Do not allow user to mess with it */

	if (IS_NOQUOTA(inode))

		goto out_unlock;



	ipage = get_node_page(sbi, inode->i_ino);

	if (IS_ERR(ipage)) {

		err = PTR_ERR(ipage);

		goto out_unlock;

	}



	if (!F2FS_FITS_IN_INODE(F2FS_INODE(ipage), fi->i_extra_isize,

								i_projid)) {

		err = -EOVERFLOW;

		f2fs_put_page(ipage, 1);

		goto out_unlock;

	}

	f2fs_put_page(ipage, 1);



	dquot_initialize(inode);



	transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));

	if (!IS_ERR(transfer_to[PRJQUOTA])) {

		err = __dquot_transfer(inode, transfer_to);

		dqput(transfer_to[PRJQUOTA]);

		if (err)

			goto out_dirty;

	}



	F2FS_I(inode)->i_projid = kprojid;

	inode->i_ctime = current_time(inode);

out_dirty:

	f2fs_mark_inode_dirty_sync(inode, true);

out_unlock:

	inode_unlock(inode);

	mnt_drop_write_file(filp);

	return err;

}

#else

static int f2fs_ioc_setproject(struct file *filp, __u32 projid)

{

	if (projid != F2FS_DEF_PROJID)

		return -EOPNOTSUPP;

	return 0;

}

#endif



/* Transfer internal flags to xflags */

static inline __u32 f2fs_iflags_to_xflags(unsigned long iflags)

{

	__u32 xflags = 0;



	if (iflags & FS_SYNC_FL)

		xflags |= FS_XFLAG_SYNC;

	if (iflags & FS_IMMUTABLE_FL)

		xflags |= FS_XFLAG_IMMUTABLE;

	if (iflags & FS_APPEND_FL)

		xflags |= FS_XFLAG_APPEND;

	if (iflags & FS_NODUMP_FL)

		xflags |= FS_XFLAG_NODUMP;

	if (iflags & FS_NOATIME_FL)

		xflags |= FS_XFLAG_NOATIME;

	if (iflags & FS_PROJINHERIT_FL)

		xflags |= FS_XFLAG_PROJINHERIT;

	return xflags;

}



#define F2FS_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \

				  FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \

				  FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)



/* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */

#define F2FS_FL_XFLAG_VISIBLE		(FS_SYNC_FL | \

					 FS_IMMUTABLE_FL | \

					 FS_APPEND_FL | \

					 FS_NODUMP_FL | \

					 FS_NOATIME_FL | \

					 FS_PROJINHERIT_FL)



/* Transfer xflags flags to internal */

static inline unsigned long f2fs_xflags_to_iflags(__u32 xflags)

{

	unsigned long iflags = 0;



	if (xflags & FS_XFLAG_SYNC)

		iflags |= FS_SYNC_FL;

	if (xflags & FS_XFLAG_IMMUTABLE)

		iflags |= FS_IMMUTABLE_FL;

	if (xflags & FS_XFLAG_APPEND)

		iflags |= FS_APPEND_FL;

	if (xflags & FS_XFLAG_NODUMP)

		iflags |= FS_NODUMP_FL;

	if (xflags & FS_XFLAG_NOATIME)

		iflags |= FS_NOATIME_FL;

	if (xflags & FS_XFLAG_PROJINHERIT)

		iflags |= FS_PROJINHERIT_FL;



	return iflags;

}



static int f2fs_ioc_fsgetxattr(struct file *filp, unsigned long arg)

{

	struct inode *inode = file_inode(filp);

	struct f2fs_inode_info *fi = F2FS_I(inode);

	struct fsxattr fa;



	memset(&fa, 0, sizeof(struct fsxattr));

	fa.fsx_xflags = f2fs_iflags_to_xflags(fi->i_flags &

				(FS_FL_USER_VISIBLE | FS_PROJINHERIT_FL));



	if (f2fs_sb_has_project_quota(inode->i_sb))

		fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,

							fi->i_projid);



	if (copy_to_user((struct fsxattr __user *)arg, &fa, sizeof(fa)))

		return -EFAULT;

	return 0;

}



static int f2fs_ioc_fssetxattr(struct file *filp, unsigned long arg)

{

	struct inode *inode = file_inode(filp);

	struct f2fs_inode_info *fi = F2FS_I(inode);

	struct fsxattr fa;

	unsigned int flags;

	int err;



	if (copy_from_user(&fa, (struct fsxattr __user *)arg, sizeof(fa)))

		return -EFAULT;



	/* Make sure caller has proper permission */

	if (!inode_owner_or_capable(inode))

		return -EACCES;



	if (fa.fsx_xflags & ~F2FS_SUPPORTED_FS_XFLAGS)

		return -EOPNOTSUPP;



	flags = f2fs_xflags_to_iflags(fa.fsx_xflags);

	if (f2fs_mask_flags(inode->i_mode, flags) != flags)

		return -EOPNOTSUPP;



	err = mnt_want_write_file(filp);

	if (err)

		return err;



	inode_lock(inode);

	flags = (fi->i_flags & ~F2FS_FL_XFLAG_VISIBLE) |

				(flags & F2FS_FL_XFLAG_VISIBLE);

	err = __f2fs_ioc_setflags(inode, flags);

	inode_unlock(inode);

	mnt_drop_write_file(filp);

	if (err)

		return err;



	err = f2fs_ioc_setproject(filp, fa.fsx_projid);

	if (err)

		return err;



	return 0;

}



long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)

{

	switch (cmd) {
@@ -2459,6 +2661,10 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 
		return f2fs_ioc_flush_device(filp, arg);

	case F2FS_IOC_GET_FEATURES:

		return f2fs_ioc_get_features(filp, arg);

	case F2FS_IOC_FSGETXATTR:

		return f2fs_ioc_fsgetxattr(filp, arg);

	case F2FS_IOC_FSSETXATTR:

		return f2fs_ioc_fssetxattr(filp, arg);

	default:

		return -ENOTTY;

	}
@@ -2525,6 +2731,8 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 
	case F2FS_IOC_MOVE_RANGE:

	case F2FS_IOC_FLUSH_DEVICE:

	case F2FS_IOC_GET_FEATURES:

	case F2FS_IOC_FSGETXATTR:

	case F2FS_IOC_FSSETXATTR:

		break;

	default:

		return -ENOIOCTLCMD;