fanotify: copy event fid info to user

If group requested FAN_REPORT_FID and event has file identifier, copy that information to user reading the event after event metadata. fid information is formatted as struct fanotify_event_info_fid that includes a generic header struct fanotify_event_info_header, so that other info types could be defined in the future using the same header. metadata->event_len includes the length of the fid information. The fid information includes the filesystem's fsid (see statfs(2)) followed by an NFS file handle of the file that could be passed as an argument to open_by_handle_at(2).

Amir Goldstein committed 7 years ago

Commit 5e469c81 parent e9e0c893 files · +102 −5Browse files

Showing the changes to include/uapi/linux (1 of 3 files). Show all

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include/uapi/linux/fanotify.h+20−0

@@ -107,6 +107,26 @@ struct fanotify_event_metadata { · 106 unmodified lines
107	__s32 pid;	107	__s32 pid;
108	};	108	};
109		109
		110	#define FAN_EVENT_INFO_TYPE_FID 1
		111
		112	/* Variable length info record following event metadata */
		113	struct fanotify_event_info_header {
		114	__u8 info_type;
		115	__u8 pad;
		116	__u16 len;
		117	};
		118
		119	/* Unique file identifier info record */
		120	struct fanotify_event_info_fid {
		121	struct fanotify_event_info_header hdr;
		122	__kernel_fsid_t fsid;
		123	/*
		124	* Following is an opaque struct file_handle that can be passed as
		125	* an argument to open_by_handle_at(2).
		126	*/
		127	unsigned char handle[0];
		128	};
		129
110	struct fanotify_response {	130	struct fanotify_response {
111	__s32 fd;	131	__s32 fd;
112	__u32 response;	132	__u32 response;