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Date: Wed, 12 Nov 2008 11:11:14 -0500
From: Eric Paris <eparis@...hat.com>
To: linux-kernel@...r.kernel.org, malware-list@...ts.printk.net
Cc: viro@...iv.linux.org.uk, alan@...rguk.ukuu.org.uk,
arjan@...radead.org, greg@...ah.com, tytso@....edu,
akpm@...ux-foundation.org
Subject: [PATCH =-v3 09/21] fanotify: add group priorities
In preperation for blocking fanotify calls group priorities must be added.
async events will be sent as quickly as possible without waiting for a
response.
Signed-off-by: Eric Paris <eparis@...hat.com>
---
fs/notify/group.c | 30 ++++++++++++++++++++++++------
include/linux/fanotify.h | 5 ++++-
net/fanotify/af_fanotify.c | 2 +-
3 files changed, 29 insertions(+), 8 deletions(-)
diff --git a/fs/notify/group.c b/fs/notify/group.c
index 21037cc..37b8630 100644
--- a/fs/notify/group.c
+++ b/fs/notify/group.c
@@ -42,15 +42,16 @@ void fanotify_get_group(struct fanotify_group *group)
atomic_inc(&group->refcnt);
}
-struct fanotify_group *fanotify_find_group(unsigned int group_num, unsigned int mask)
+struct fanotify_group *fanotify_find_group(unsigned int priority, unsigned int group_num, unsigned int mask)
{
struct fanotify_group *group_iter;
struct fanotify_group *group = NULL;
mutex_lock(&fanotify_grp_mutex);
list_for_each_entry_rcu(group_iter, &fanotify_groups, group_list) {
- if (group_iter->group_num == group_num) {
- if (group_iter->mask == mask) {
+ if (group_iter->priority == priority) {
+ if ((group_iter->mask == mask) &&
+ (group_iter->group_num == group_num)) {
fanotify_get_group(group_iter);
group = group_iter;
} else
@@ -69,6 +70,7 @@ struct fanotify_group *fanotify_find_group(unsigned int group_num, unsigned int
group->group_num = group_num;
group->mask = mask;
+ group->priority = priority;
mutex_init(&group->notification_mutex);
INIT_LIST_HEAD(&group->notification_list);
@@ -77,9 +79,26 @@ struct fanotify_group *fanotify_find_group(unsigned int group_num, unsigned int
mutex_init(&group->fastpath_mutex);
INIT_LIST_HEAD(&group->fastpath_entries);
- /* add it */
- list_add_rcu(&group->group_list, &fanotify_groups);
+ /* Do we need to be the first entry? */
+ if (list_empty(&fanotify_groups)) {
+ list_add_rcu(&group->group_list, &fanotify_groups);
+ goto out;
+ }
+
+ list_for_each_entry(group_iter, &fanotify_groups, group_list) {
+ /* insert in front of this one? */
+ if (priority < group_iter->priority) {
+ /* I used list_add_tail() to insert in front of group_iter... */
+ list_add_tail_rcu(&group->group_list, &group_iter->group_list);
+ break;
+ }
+ /* are we at the end? if so insert at end */
+ if (list_is_last(&group_iter->group_list, &fanotify_groups)) {
+ list_add_tail_rcu(&group->group_list, &fanotify_groups);
+ break;
+ }
+ }
out:
mutex_unlock(&fanotify_grp_mutex);
return group;
@@ -100,7 +119,6 @@ void fanotify_put_group(struct fanotify_group *group)
{
mutex_lock(&fanotify_grp_mutex);
if (atomic_dec_and_test(&group->refcnt)) {
-
list_del_rcu(&group->group_list);
mutex_unlock(&fanotify_grp_mutex);
diff --git a/include/linux/fanotify.h b/include/linux/fanotify.h
index 0646840..ae16b17 100644
--- a/include/linux/fanotify.h
+++ b/include/linux/fanotify.h
@@ -37,6 +37,7 @@
#include <linux/types.h>
struct fanotify_addr {
+ __u32 priority;
__u32 group_num;
__u32 mask;
__u32 timeout;
@@ -84,6 +85,8 @@ struct fanotify_group {
/* stores all fastapth entries assoc with this group so they can be cleaned on unregister */
struct mutex fastpath_mutex; /* protect fastpath_entries list */
struct list_head fastpath_entries; /* all fastpath entries for this group */
+
+ unsigned int priority; /* order this group should receive msgs. low first */
};
#ifdef CONFIG_FANOTIFY
@@ -92,7 +95,7 @@ extern void fanotify(struct file *file, unsigned int mask);
extern void fanotify_inode_delete(struct inode *inode);
extern void fanotify_get_group(struct fanotify_group *group);
-extern struct fanotify_group *fanotify_find_group(unsigned int group_num, unsigned int mask);
+extern struct fanotify_group *fanotify_find_group(unsigned int priority, unsigned int group_num, unsigned int mask);
extern void fanotify_put_group(struct fanotify_group *group);
/* things called from the socket */
diff --git a/net/fanotify/af_fanotify.c b/net/fanotify/af_fanotify.c
index 6f2357c..3b7283e 100644
--- a/net/fanotify/af_fanotify.c
+++ b/net/fanotify/af_fanotify.c
@@ -145,7 +145,7 @@ static int fan_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
return -EINVAL;
fan_sock = fan_sk(sock->sk);
- fan_sock->group = fanotify_find_group(fan_addr->group_num, fan_addr->mask);
+ fan_sock->group = fanotify_find_group(fan_addr->priority, fan_addr->group_num, fan_addr->mask);
if (IS_ERR(fan_sock->group))
return PTR_ERR(fan_sock->group);
--
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