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[PATCH 2/2] f2fs: support fs shutdown

To: linux-kernel@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-f2fs-devel@xxxxxxxxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
Subject: [PATCH 2/2] f2fs: support fs shutdown
From: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Date: Fri, 9 Jan 2015 01:34:36 -0800
Cc: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <1420796076-82847-1-git-send-email-jaegeuk@xxxxxxxxxx>
References: <1420796076-82847-1-git-send-email-jaegeuk@xxxxxxxxxx>
This patch add an ioctl to shutdown f2fs, which stops all the further block
writes after this point.

The ioctl, FS_IOC_SHUTDOWN, provides the following three 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: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
 fs/f2fs/file.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 5df3367..a7114858 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1020,6 +1020,41 @@ 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 FS_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 FS_GOING_DOWN_METASYNC:
+               /* do checkpoint only */
+               f2fs_sync_fs(sb, 1);
+               f2fs_stop_checkpoint(sbi);
+               break;
+       case FS_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);
@@ -1067,6 +1102,8 @@ 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 FS_IOC_SHUTDOWN:
+               return f2fs_ioc_shutdown(filp, arg);
        case FITRIM:
                return f2fs_ioc_fitrim(filp, arg);
        default:
-- 
2.1.1

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