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: Theodore Ts'o <tytso@mit.edu>

1 files changed, 11 insertions, 0 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index b22f24f1d365..ee296797bcd2 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -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)
 /*