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Commit0858caa

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uapi: General notification queue definitions
Add UAPI definitions for the general notification queue, including thefollowing pieces: (*) struct watch_notification. This is the metadata header for notification messages. It includes a type and subtype that indicate the source of the message (eg. WATCH_TYPE_MOUNT_NOTIFY) and the kind of the message (eg. NOTIFY_MOUNT_NEW_MOUNT). The header also contains an information field that conveys the following information:- WATCH_INFO_LENGTH. The size of the entry (entries are variable length).- WATCH_INFO_ID. The watch ID specified when the watchpoint was set.- WATCH_INFO_TYPE_INFO. (Sub)type-specific information.- WATCH_INFO_FLAG_*. Flag bits overlain on the type-specific information. For use by the type. All the information in the header can be used in filtering messages at the point of writing into the buffer. (*) struct watch_notification_removal This is an extended watch-removal notification record that includes an 'id' field that can indicate the identifier of the object being removed if available (for instance, a keyring serial number).Signed-off-by: David Howells <dhowells@redhat.com>
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‎include/uapi/linux/watch_queue.h‎

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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef_UAPI_LINUX_WATCH_QUEUE_H
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#define_UAPI_LINUX_WATCH_QUEUE_H
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#include<linux/types.h>
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enumwatch_notification_type {
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WATCH_TYPE_META=0,/* Special record */
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WATCH_TYPE__NR=1
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};
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enumwatch_meta_notification_subtype {
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WATCH_META_REMOVAL_NOTIFICATION=0,/* Watched object was removed */
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WATCH_META_LOSS_NOTIFICATION=1,/* Data loss occurred */
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};
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/*
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* Notification record header. This is aligned to 64-bits so that subclasses
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* can contain __u64 fields.
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*/
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structwatch_notification {
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__u32type:24;/* enum watch_notification_type */
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__u32subtype:8;/* Type-specific subtype (filterable) */
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__u32info;
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#defineWATCH_INFO_LENGTH0x0000007f/* Length of record */
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#defineWATCH_INFO_LENGTH__SHIFT 0
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#defineWATCH_INFO_ID0x0000ff00/* ID of watchpoint */
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#defineWATCH_INFO_ID__SHIFT8
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#defineWATCH_INFO_TYPE_INFO0xffff0000/* Type-specific info */
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#defineWATCH_INFO_TYPE_INFO__SHIFT 16
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#defineWATCH_INFO_FLAG_00x00010000/* Type-specific info, flag bit 0 */
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#defineWATCH_INFO_FLAG_10x00020000/* ... */
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#defineWATCH_INFO_FLAG_20x00040000
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#defineWATCH_INFO_FLAG_30x00080000
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#defineWATCH_INFO_FLAG_40x00100000
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#defineWATCH_INFO_FLAG_50x00200000
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#defineWATCH_INFO_FLAG_60x00400000
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#defineWATCH_INFO_FLAG_70x00800000
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};
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/*
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* Extended watch removal notification. This is used optionally if the type
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* wants to indicate an identifier for the object being watched, if there is
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* such. This can be distinguished by the length.
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*
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* type -> WATCH_TYPE_META
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* subtype -> WATCH_META_REMOVAL_NOTIFICATION
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*/
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structwatch_notification_removal {
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structwatch_notificationwatch;
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__u64id;/* Type-dependent identifier */
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};
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#endif/* _UAPI_LINUX_WATCH_QUEUE_H */

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