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Commit 1abff93d authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: support fs shutdown 



This patch introduces a generic ioctl for fs shutdown, which was used by xfs.

If this shutdown is triggered, filesystem stops any further IOs according to the
following options.

1. FS_GOING_DOWN_FULLSYNC
 : this will flush all the data and dentry blocks, and do checkpoint before
   shutdown.

2. FS_GOING_DOWN_METASYNC
 : this will do checkpoint before shutdown.

3. FS_GOING_DOWN_NOSYNC
 : this will trigger shutdown as is.

Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 8fbc418f

fs/f2fs/f2fs.h

+9 −0
Original line number Diff line number Diff line
@@ -217,6 +217,15 @@ static inline bool __has_cursum_space(struct f2fs_summary_block *sum, int size, 
#define F2FS_IOC_RELEASE_VOLATILE_WRITE	_IO(F2FS_IOCTL_MAGIC, 4)

#define F2FS_IOC_ABORT_VOLATILE_WRITE	_IO(F2FS_IOCTL_MAGIC, 5)



/*

 * should be same as XFS_IOC_GOINGDOWN.

 * Flags for going down operation used by FS_IOC_GOINGDOWN

 */

#define F2FS_IOC_SHUTDOWN	_IOR('X', 125, __u32)	/* Shutdown */

#define F2FS_GOING_DOWN_FULLSYNC	0x0	/* going down with full sync */

#define F2FS_GOING_DOWN_METASYNC	0x1	/* going down with metadata */

#define F2FS_GOING_DOWN_NOSYNC		0x2	/* going down */



#if defined(__KERNEL__) && defined(CONFIG_COMPAT)

/*

 * ioctl commands in 32 bit emulation

fs/f2fs/file.c

+37 −0
Original line number Diff line number Diff line
@@ -1029,6 +1029,41 @@ static int f2fs_ioc_abort_volatile_write(struct file *filp) 
	return ret;

}



static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)

{

	struct inode *inode = file_inode(filp);

	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);

	struct super_block *sb = sbi->sb;

	__u32 in;



	if (!capable(CAP_SYS_ADMIN))

		return -EPERM;



	if (get_user(in, (__u32 __user *)arg))

		return -EFAULT;



	switch (in) {

	case F2FS_GOING_DOWN_FULLSYNC:

		sb = freeze_bdev(sb->s_bdev);

		if (sb && !IS_ERR(sb)) {

			f2fs_stop_checkpoint(sbi);

			thaw_bdev(sb->s_bdev, sb);

		}

		break;

	case F2FS_GOING_DOWN_METASYNC:

		/* do checkpoint only */

		f2fs_sync_fs(sb, 1);

		f2fs_stop_checkpoint(sbi);

		break;

	case F2FS_GOING_DOWN_NOSYNC:

		f2fs_stop_checkpoint(sbi);

		break;

	default:

		return -EINVAL;

	}

	return 0;

}



static int f2fs_ioc_fitrim(struct file *filp, unsigned long arg)

{

	struct inode *inode = file_inode(filp);
@@ -1078,6 +1113,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 
		return f2fs_ioc_release_volatile_write(filp);

	case F2FS_IOC_ABORT_VOLATILE_WRITE:

		return f2fs_ioc_abort_volatile_write(filp);

	case F2FS_IOC_SHUTDOWN:

		return f2fs_ioc_shutdown(filp, arg);

	case FITRIM:

		return f2fs_ioc_fitrim(filp, arg);

	default: