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fanotify: store fanotify_init() flags in group's fanotify_data 

This averts the need to re-generate flags in fanotify_show_fdinfo()
and sets the scene for addition of more upcoming flags without growing
new members to the fanotify_data struct.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein 2018-09-21 21:20:30 +03:00 committed by Jan Kara
parent d54f4fba88
commit 96a71f21ef
4 changed files with 11 additions and 29 deletions
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8
fs/notify/fanotify/fanotify_user.c
View File

@ -191,7 +191,7 @@ static int process_access_response(struct fsnotify_group *group,
if (fd < 0)
return -EINVAL;
if ((response & FAN_AUDIT) && !group->fanotify_data.audit)
if ((response & FAN_AUDIT) && !FAN_GROUP_FLAG(group, FAN_ENABLE_AUDIT))
return -EINVAL;
event = dequeue_event(group, fd);
@ -701,8 +701,8 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
struct user_struct *user;
struct fanotify_event_info *oevent;
pr_debug("%s: flags=%d event_f_flags=%d\n",
__func__, flags, event_f_flags);
pr_debug("%s: flags=%x event_f_flags=%x\n",
__func__, flags, event_f_flags);
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
@ -746,6 +746,7 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
}
group->fanotify_data.user = user;
group->fanotify_data.flags = flags;
atomic_inc(&user->fanotify_listeners);
group->memcg = get_mem_cgroup_from_mm(current->mm);
@ -798,7 +799,6 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
fd = -EPERM;
if (!capable(CAP_AUDIT_WRITE))
goto out_destroy_group;
group->fanotify_data.audit = true;
}
fd = anon_inode_getfd("[fanotify]", &fanotify_fops, group, f_flags);

24
fs/notify/fdinfo.c
View File

@ -142,31 +142,9 @@ static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
{
struct fsnotify_group *group = f->private_data;
unsigned int flags = 0;
switch (group->priority) {
case FS_PRIO_0:
flags |= FAN_CLASS_NOTIF;
break;
case FS_PRIO_1:
flags |= FAN_CLASS_CONTENT;
break;
case FS_PRIO_2:
flags |= FAN_CLASS_PRE_CONTENT;
break;
}
if (group->max_events == UINT_MAX)
flags |= FAN_UNLIMITED_QUEUE;
if (group->fanotify_data.max_marks == UINT_MAX)
flags |= FAN_UNLIMITED_MARKS;
if (group->fanotify_data.audit)
flags |= FAN_ENABLE_AUDIT;
seq_printf(m, "fanotify flags:%x event-flags:%x\n",
flags, group->fanotify_data.f_flags);
group->fanotify_data.flags, group->fanotify_data.f_flags);
show_fdinfo(m, f, fanotify_fdinfo);
}

4
include/linux/fanotify.h
View File

@ -6,4 +6,8 @@
/* not valid from userspace, only kernel internal */
#define FAN_MARK_ONDIR 0x00000100
#define FAN_GROUP_FLAG(group, flag) \
((group)->fanotify_data.flags & (flag))
#endif /* _LINUX_FANOTIFY_H */

4
include/linux/fsnotify_backend.h
View File

@ -189,10 +189,10 @@ struct fsnotify_group {
/* allows a group to block waiting for a userspace response */
struct list_head access_list;
wait_queue_head_t access_waitq;
int f_flags;
int flags; /* flags from fanotify_init() */
int f_flags; /* event_f_flags from fanotify_init() */
unsigned int max_marks;
struct user_struct *user;
bool audit;
} fanotify_data;
#endif /* CONFIG_FANOTIFY */
};