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fsnotify: use an enum for group priority constants

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And use meaningfull names for the constants.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20240317184154.1200192-10-amir73il@gmail.com>
This commit is contained in:
Amir Goldstein 2024-03-17 20:41:53 +02:00 committed by Jan Kara
parent cb5d4f48c1
commit 477cf917dd
2 changed files with 17 additions and 14 deletions
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11
fs/notify/fanotify/fanotify_user.c
View file

@ -1516,13 +1516,13 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
INIT_LIST_HEAD(&group->fanotify_data.access_list);
switch (class) {
case FAN_CLASS_NOTIF:
group->priority = FS_PRIO_0;
group->priority = FSNOTIFY_PRIO_NORMAL;
break;
case FAN_CLASS_CONTENT:
group->priority = FS_PRIO_1;
group->priority = FSNOTIFY_PRIO_CONTENT;
break;
case FAN_CLASS_PRE_CONTENT:
group->priority = FS_PRIO_2;
group->priority = FSNOTIFY_PRIO_PRE_CONTENT;
break;
default:
fd = -EINVAL;
@ -1774,12 +1774,11 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
goto fput_and_out;
/*
* group->priority == FS_PRIO_0 == FAN_CLASS_NOTIF. These are not
* allowed to set permissions events.
* Permission events require minimum priority FAN_CLASS_CONTENT.
*/
ret = -EINVAL;
if (mask & FANOTIFY_PERM_EVENTS &&
group->priority == FS_PRIO_0)
group->priority < FSNOTIFY_PRIO_CONTENT)
goto fput_and_out;
if (mask & FAN_FS_ERROR &&

20
include/linux/fsnotify_backend.h
View file

@ -176,6 +176,17 @@ struct fsnotify_event {
struct list_head list;
};
/*
* fsnotify group priorities.
* Events are sent in order from highest priority to lowest priority.
*/
enum fsnotify_group_prio {
FSNOTIFY_PRIO_NORMAL = 0, /* normal notifiers, no permissions */
FSNOTIFY_PRIO_CONTENT, /* fanotify permission events */
FSNOTIFY_PRIO_PRE_CONTENT, /* fanotify pre-content events */
__FSNOTIFY_PRIO_NUM
};
/*
* A group is a "thing" that wants to receive notification about filesystem
* events. The mask holds the subset of event types this group cares about.
@ -201,14 +212,7 @@ struct fsnotify_group {
wait_queue_head_t notification_waitq; /* read() on the notification file blocks on this waitq */
unsigned int q_len; /* events on the queue */
unsigned int max_events; /* maximum events allowed on the list */
/*
* Valid fsnotify group priorities. Events are send in order from highest
* priority to lowest priority. We default to the lowest priority.
*/
#define FS_PRIO_0 0 /* normal notifiers, no permissions */
#define FS_PRIO_1 1 /* fanotify content based access control */
#define FS_PRIO_2 2 /* fanotify pre-content access */
unsigned int priority;
enum fsnotify_group_prio priority; /* priority for sending events */
bool shutdown; /* group is being shut down, don't queue more events */
#define FSNOTIFY_GROUP_USER 0x01 /* user allocated group */