#define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40)
#define EXT4_IOC_GETSTATE _IOW('f', 41, __u32)
#define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap)
+#define EXT4_IOC_CHECKPOINT _IOW('f', 43, __u32)
#define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
#define EXT4_STATE_FLAG_NEWENTRY 0x00000004
#define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008
+/* flags for ioctl EXT4_IOC_CHECKPOINT */
+#define EXT4_IOC_CHECKPOINT_FLAG_DISCARD 0x1
+#define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT 0x2
+#define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN 0x4
+#define EXT4_IOC_CHECKPOINT_FLAG_VALID (EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \
+ EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \
+ EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
+
#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
/*
* ioctl commands in 32 bit emulation
return error;
}
+static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg)
+{
+ int err = 0;
+ __u32 flags = 0;
+ unsigned int flush_flags = 0;
+ struct super_block *sb = file_inode(filp)->i_sb;
+ struct request_queue *q;
+
+ if (copy_from_user(&flags, (__u32 __user *)arg,
+ sizeof(__u32)))
+ return -EFAULT;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ /* check for invalid bits set */
+ if ((flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID) ||
+ ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
+ (flags & JBD2_JOURNAL_FLUSH_ZEROOUT)))
+ return -EINVAL;
+
+ if (!EXT4_SB(sb)->s_journal)
+ return -ENODEV;
+
+ if (flags & ~JBD2_JOURNAL_FLUSH_VALID)
+ return -EINVAL;
+
+ q = bdev_get_queue(EXT4_SB(sb)->s_journal->j_dev);
+ if (!q)
+ return -ENXIO;
+ if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) && !blk_queue_discard(q))
+ return -EOPNOTSUPP;
+
+ if (flags & EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
+ return 0;
+
+ if (flags & EXT4_IOC_CHECKPOINT_FLAG_DISCARD)
+ flush_flags |= JBD2_JOURNAL_FLUSH_DISCARD;
+
+ if (flags & EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT) {
+ flush_flags |= JBD2_JOURNAL_FLUSH_ZEROOUT;
+ pr_info_ratelimited("warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow");
+ }
+
+ jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
+ err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, flush_flags);
+ jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
+
+ return err;
+}
+
static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct inode *inode = file_inode(filp);
return fsverity_ioctl_read_metadata(filp,
(const void __user *)arg);
+ case EXT4_IOC_CHECKPOINT:
+ return ext4_ioctl_checkpoint(filp, arg);
+
default:
return -ENOTTY;
}
case EXT4_IOC_CLEAR_ES_CACHE:
case EXT4_IOC_GETSTATE:
case EXT4_IOC_GET_ES_CACHE:
+ case EXT4_IOC_CHECKPOINT:
break;
default:
return -ENOIOCTLCMD;