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authorTheodore Ts'o <tytso@mit.edu>2019-08-11 16:31:41 -0400
committerTheodore Ts'o <tytso@mit.edu>2019-08-11 16:31:41 -0400
commit1ad3ea6e0a694b0486eb2cbe60378ad0fbf23642 (patch)
treeb728b3450505eac1e85fb7898f49769a22a2938d /fs/ext4
parentb0c013e2928d3696ceb6401311dbc1d7fcccd6dd (diff)
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>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/ext4.h11
-rw-r--r--fs/ext4/ioctl.c17
2 files changed, 28 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)
/*
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 15b1047878ab..ffb7bde4900d 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -1123,6 +1123,22 @@ resizefs_out:
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;