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ext4: add a new ioctl EXT4_IOC_GETSTATE

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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>
This commit is contained in:
Theodore Ts'o 2019-08-11 16:31:41 -04:00
parent b0c013e292
commit 1ad3ea6e0a
2 changed files with 28 additions and 0 deletions
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11
fs/ext4/ext4.h
View File

@ -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)
/*

17
fs/ext4/ioctl.c
View File

@ -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;