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fanotify: support reporting thread id instead of process id

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In order to identify which thread triggered the event in a
multi-threaded program, add the FAN_REPORT_TID flag in fanotify_init to
opt-in for reporting the event creator's thread id information.

Signed-off-by: nixiaoming <nixiaoming@huawei.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein
2018-10-04 00:25:38 +03:00
committed by Jan Kara
parent bdd5a46fe3
commit d0a6a87e40
5 changed files with 13 additions and 6 deletions
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4
fs/notify/fanotify/fanotify_user.c
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@@ -132,7 +132,7 @@ static int fill_event_metadata(struct fsnotify_group *group,
metadata->vers = FANOTIFY_METADATA_VERSION;
metadata->reserved = 0;
metadata->mask = fsn_event->mask & FANOTIFY_OUTGOING_EVENTS;
metadata->pid = pid_vnr(event->tgid);
metadata->pid = pid_vnr(event->pid);
if (unlikely(fsn_event->mask & FAN_Q_OVERFLOW))
metadata->fd = FAN_NOFD;
else {
@@ -944,7 +944,7 @@ COMPAT_SYSCALL_DEFINE6(fanotify_mark,
*/
static int __init fanotify_user_setup(void)
{
BUILD_BUG_ON(HWEIGHT32(FANOTIFY_INIT_FLAGS) != 6);
BUILD_BUG_ON(HWEIGHT32(FANOTIFY_INIT_FLAGS) != 7);
BUILD_BUG_ON(HWEIGHT32(FANOTIFY_MARK_FLAGS) != 9);
fanotify_mark_cache = KMEM_CACHE(fsnotify_mark,