Commit 1ad3ea6e authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

ext4: add a new ioctl EXT4_IOC_GETSTATE 



The new ioctl EXT4_IOC_GETSTATE returns some of the dynamic state of
an ext4 inode for debugging purposes.

Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent b0c013e2

fs/ext4/ext4.h

+11 −0
Original line number Diff line number Diff line
@@ -651,6 +651,7 @@ enum { 
#define EXT4_IOC_GET_ENCRYPTION_POLICY	FS_IOC_GET_ENCRYPTION_POLICY

/* ioctl codes 19--39 are reserved for fscrypt */

#define EXT4_IOC_CLEAR_ES_CACHE		_IO('f', 40)

#define EXT4_IOC_GETSTATE		_IOW('f', 41, __u32)



#define EXT4_IOC_FSGETXATTR		FS_IOC_FSGETXATTR

#define EXT4_IOC_FSSETXATTR		FS_IOC_FSSETXATTR
@@ -664,6 +665,16 @@ enum { 
#define EXT4_GOING_FLAGS_LOGFLUSH		0x1	/* flush log but not data */

#define EXT4_GOING_FLAGS_NOLOGFLUSH		0x2	/* don't flush log nor data */



/*

 * Flags returned by EXT4_IOC_GETSTATE

 *

 * We only expose to userspace a subset of the state flags in

 * i_state_flags

 */

#define EXT4_STATE_FLAG_EXT_PRECACHED	0x00000001

#define EXT4_STATE_FLAG_NEW		0x00000002

#define EXT4_STATE_FLAG_NEWENTRY	0x00000004

#define EXT4_STATE_FLAG_DA_ALLOC_CLOSE	0x00000008



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

/*

fs/ext4/ioctl.c

+17 −0
Original line number Diff line number Diff line
@@ -1123,6 +1123,22 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 
		return 0;

	}



	case EXT4_IOC_GETSTATE:

	{

		__u32	state = 0;



		if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED))

			state |= EXT4_STATE_FLAG_EXT_PRECACHED;

		if (ext4_test_inode_state(inode, EXT4_STATE_NEW))

			state |= EXT4_STATE_FLAG_NEW;

		if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))

			state |= EXT4_STATE_FLAG_NEWENTRY;

		if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE))

			state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE;



		return put_user(state, (__u32 __user *) arg);

	}



	case EXT4_IOC_FSGETXATTR:

	{

		struct fsxattr fa;
@@ -1242,6 +1258,7 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 
	case EXT4_IOC_SHUTDOWN:

	case FS_IOC_GETFSMAP:

	case EXT4_IOC_CLEAR_ES_CACHE:

	case EXT4_IOC_GETSTATE:

		break;

	default:

		return -ENOIOCTLCMD;