Commit 3f1c8c93 authored by Long Li's avatar Long Li
Browse files

xfs: support atomic write ioctl 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I9VTE3


CVE: NA

--------------------------------

Support FS_IOC_SETATOMIC ioctl, if filesystem and file could support
atomic write, then enable file's atomic write function. Database like
Mysql could use this ioctl check and enable file atomic write.

Signed-off-by: default avatarLong Li <leo.lilong@huawei.com>
parent 81928136

fs/xfs/xfs_ioctl.c

+47 −0
Original line number Diff line number Diff line
@@ -2112,6 +2112,28 @@ xfs_fs_eofblocks_from_user( 
	return 0;

}



static int

xfs_ioc_set_atomic_write(

	struct xfs_inode	*ip)

{

	struct xfs_trans	*tp;

	int			error;



	tp = xfs_ioctl_setattr_get_trans(ip, NULL);

	if (IS_ERR(tp)) {

		error = PTR_ERR(tp);

		goto out;

	}



	ip->i_d.di_flags2 |= XFS_DIFLAG2_ATOMICWRITES;



	xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);

	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

	error = xfs_trans_commit(tp);

out:

	return error;

}



/*

 * Note: some of the ioctl's return positive numbers as a

 * byte count indicating success, such as readlink_by_handle.
@@ -2139,6 +2161,31 @@ xfs_file_ioctl( 
		return xfs_ioc_getlabel(mp, arg);

	case FS_IOC_SETFSLABEL:

		return xfs_ioc_setlabel(filp, mp, arg);

	case FS_IOC_SETATOMIC:

		if (!xfs_has_atomicwrites(mp))

			return -1;

		if (!S_ISREG(inode->i_mode))

			return -1;

		if (xfs_inode_atomicwrites(ip))

			return 0;

		if (!xfs_inode_forcealign(ip))

			return -1;



		xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL);

		error = xfs_ioc_set_atomic_write(ip);

		xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL);

		if (error) {

			xfs_alert(mp, "%s: set ino 0x%llx atomic write fail!",

					__func__, XFS_I(inode)->i_ino);

			return -1;

		} else {

			struct xfs_buftarg      *target = xfs_inode_buftarg(ip);



			if ((filp->f_flags & O_DIRECT) &&

			    bdev_can_atomic_write(target->bt_bdev))

				filp->f_mode |= FMODE_CAN_ATOMIC_WRITE;

			return 0;

		}

	case XFS_IOC_ALLOCSP:

	case XFS_IOC_FREESP:

	case XFS_IOC_ALLOCSP64:

include/uapi/linux/fs.h

+1 −0
Original line number Diff line number Diff line
@@ -217,6 +217,7 @@ struct fsxattr { 
#define FS_IOC_FSSETXATTR		_IOW('X', 32, struct fsxattr)

#define FS_IOC_GETFSLABEL		_IOR(0x94, 49, char[FSLABEL_MAX])

#define FS_IOC_SETFSLABEL		_IOW(0x94, 50, char[FSLABEL_MAX])

#define FS_IOC_SETATOMIC		_IOW(0x95, 2, uint)



/*

 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)