diff options
| -rw-r--r-- | fs/ext4/ext4.h | 9 | ||||
| -rw-r--r-- | fs/ext4/ioctl.c | 55 |
2 files changed, 64 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 2b51cbee3907..a646bfcbd0e8 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -720,6 +720,7 @@ enum { #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) @@ -741,6 +742,14 @@ enum { #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 diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index 93e9419825b8..5730aeca563c 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -799,6 +799,57 @@ static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg) 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); @@ -1210,6 +1261,9 @@ resizefs_out: return fsverity_ioctl_read_metadata(filp, (const void __user *)arg); + case EXT4_IOC_CHECKPOINT: + return ext4_ioctl_checkpoint(filp, arg); + default: return -ENOTTY; } @@ -1290,6 +1344,7 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) case EXT4_IOC_CLEAR_ES_CACHE: case EXT4_IOC_GETSTATE: case EXT4_IOC_GET_ES_CACHE: + case EXT4_IOC_CHECKPOINT: break; default: return -ENOIOCTLCMD; |