ANDROID: Incremental fs: Add uid to INCFS_IOC_GET_LAST_READ_ERROR

Bug: 186796876
Test: incfs_test passes
Signed-off-by: Paul Lawrence <paullawrence@google.com>
Change-Id: I552cae5e87b004202364ba5c9c5f9febb9e106f2

fs/incfs/data_mgmt.c

@@ -1274,6 +1274,7 @@ static int incfs_update_sysfs_error(struct file *file, int index, int result,
 	mi->mi_le_time_us = ktime_to_us(ktime_get());
 	mi->mi_le_page = index;
 	mi->mi_le_errno = result;
+	mi->mi_le_uid = current_uid().val;
 	mutex_unlock(&mi->mi_le_mutex);
 
 	return 0;

fs/incfs/data_mgmt.h

@@ -199,6 +199,7 @@ struct mount_info {
 	u64		mi_le_time_us;
 	u32		mi_le_page;
 	u32		mi_le_errno;
+	uid_t		mi_le_uid;
 
 	/* Number of reads timed out */
 	u32 mi_reads_failed_timed_out;

fs/incfs/pseudo_files.c

@@ -1005,6 +1005,7 @@ static long ioctl_get_last_read_error(struct mount_info *mi, void __user *arg)
 	args.time_us_out = mi->mi_le_time_us;
 	args.page_out = mi->mi_le_page;
 	args.errno_out = mi->mi_le_errno;
+	args.uid_out = mi->mi_le_uid;
 
 	mutex_unlock(&mi->mi_le_mutex);
 	if (copy_to_user(args_usr_ptr, &args, sizeof(args)) > 0)

include/uapi/linux/incrementalfs.h

@@ -580,7 +580,11 @@ struct incfs_get_last_read_error_args {
 	/* errno of last read error */
 	__u32	errno_out;
 
-	__u64	reserved;
+	/* uid of last read error */
+	__u32	uid_out;
+
+	__u32	reserved1;
+	__u64	reserved2;
 };
 
 #endif /* _UAPI_LINUX_INCREMENTALFS_H */