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f2fs: support fs shutdown

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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: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2015-01-08 19:15:53 -08:00
parent 8fbc418f99
commit 1abff93d01
2 changed files with 46 additions and 0 deletions
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9
fs/f2fs/f2fs.h
View File

@ -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

37
fs/f2fs/file.c
View File

@ -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: