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fanotify: report file range info with pre-content events

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With group class FAN_CLASS_PRE_CONTENT, report offset and length info
along with FAN_PRE_ACCESS pre-content events.

This information is meant to be used by hierarchical storage managers
that want to fill partial content of files on first access to range.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/b90a9e6c809dd3cad5684da90f23ea93ec6ce8c8.1731684329.git.josef@toxicpanda.com
This commit is contained in:
Amir Goldstein
2024-12-10 12:03:17 +01:00
committed by Jan Kara
parent 4f8afa3381
commit 870499bc1d
3 changed files with 54 additions and 0 deletions
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include/uapi/linux/fanotify.h
+8
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@@ -146,6 +146,7 @@ struct fanotify_event_metadata {
#define FAN_EVENT_INFO_TYPE_DFID 3
#define FAN_EVENT_INFO_TYPE_PIDFD 4
#define FAN_EVENT_INFO_TYPE_ERROR 5
#define FAN_EVENT_INFO_TYPE_RANGE 6
/* Special info types for FAN_RENAME */
#define FAN_EVENT_INFO_TYPE_OLD_DFID_NAME 10
@@ -192,6 +193,13 @@ struct fanotify_event_info_error {
__u32 error_count;
};
struct fanotify_event_info_range {
struct fanotify_event_info_header hdr;
__u32 pad;
__u64 offset;
__u64 count;
};
/*
* User space may need to record additional information about its decision.
* The extra information type records what kind of information is included.