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fsnotify: include vfsmount in should_send_event when appropriate

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To ensure that a group will not duplicate events when it receives it based
on the vfsmount and the inode should_send_event test we should distinguish
those two cases.  We pass a vfsmount to this function so groups can make
their own determinations.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris 2009-12-17 21:24:23 -05:00
parent 7131485a93
commit 3a9fb89f4c
6 changed files with 29 additions and 26 deletions
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4
fs/notify/dnotify/dnotify.c
View File

@ -133,8 +133,8 @@ static int dnotify_handle_event(struct fsnotify_group *group,
* userspace notification for that pair.
*/
static bool dnotify_should_send_event(struct fsnotify_group *group,
struct inode *inode, __u32 mask,
void *data, int data_type)
struct inode *inode, struct vfsmount *mnt,
__u32 mask, void *data, int data_type)
{
struct fsnotify_mark_entry *entry;
bool send;

39
fs/notify/fsnotify.c
View File

@ -135,13 +135,12 @@ void __fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask)
}
EXPORT_SYMBOL_GPL(__fsnotify_parent);
static void send_to_group(__u32 mask,
struct fsnotify_group *group,
void *data, int data_is, const char *file_name,
u32 cookie, struct fsnotify_event **event,
struct inode *to_tell)
static void send_to_group(struct fsnotify_group *group, struct inode *to_tell,
struct vfsmount *mnt, __u32 mask, void *data,
int data_is, u32 cookie, const char *file_name,
struct fsnotify_event **event)
{
if (!group->ops->should_send_event(group, to_tell, mask,
if (!group->ops->should_send_event(group, to_tell, mnt, mask,
data, data_is))
return;
if (!*event) {
@ -159,15 +158,9 @@ static void send_to_group(__u32 mask,
group->ops->handle_event(group, *event);
}
static bool needed_by_vfsmount(__u32 test_mask, void *data, int data_is)
static bool needed_by_vfsmount(__u32 test_mask, struct vfsmount *mnt)
{
struct path *path;
if (data_is == FSNOTIFY_EVENT_PATH)
path = (struct path *)data;
else if (data_is == FSNOTIFY_EVENT_FILE)
path = &((struct file *)data)->f_path;
else
if (!mnt)
return false;
/* hook in this when mnt->mnt_fsnotify_mask is defined */
@ -184,6 +177,7 @@ void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is, const
{
struct fsnotify_group *group;
struct fsnotify_event *event = NULL;
struct vfsmount *mnt = NULL;
int idx;
/* global tests shouldn't care about events on child only the specific event */
__u32 test_mask = (mask & ~FS_EVENT_ON_CHILD);
@ -198,10 +192,15 @@ void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is, const
!(test_mask & fsnotify_vfsmount_mask))
return;
if (data_is == FSNOTIFY_EVENT_PATH)
mnt = ((struct path *)data)->mnt;
else if (data_is == FSNOTIFY_EVENT_FILE)
mnt = ((struct file *)data)->f_path.mnt;
/* if this inode's directed listeners don't care and nothing on the vfsmount
* listeners list cares, nothing to do */
if (!(test_mask & to_tell->i_fsnotify_mask) &&
!needed_by_vfsmount(test_mask, data, data_is))
!needed_by_vfsmount(test_mask, mnt))
return;
/*
@ -214,16 +213,16 @@ void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is, const
if (test_mask & to_tell->i_fsnotify_mask) {
list_for_each_entry_rcu(group, &fsnotify_inode_groups, inode_group_list) {
if (test_mask & group->mask) {
send_to_group(mask, group, data, data_is,
file_name, cookie, &event, to_tell);
send_to_group(group, to_tell, NULL, mask, data, data_is,
cookie, file_name, &event);
}
}
}
if (needed_by_vfsmount(test_mask, data, data_is)) {
if (needed_by_vfsmount(test_mask, mnt)) {
list_for_each_entry_rcu(group, &fsnotify_vfsmount_groups, vfsmount_group_list) {
if (test_mask & group->mask) {
send_to_group(mask, group, data, data_is,
file_name, cookie, &event, to_tell);
send_to_group(group, to_tell, mnt, mask, data, data_is,
cookie, file_name, &event);
}
}
}

3
fs/notify/inotify/inotify_fsnotify.c
View File

@ -141,7 +141,8 @@ static void inotify_freeing_mark(struct fsnotify_mark_entry *entry, struct fsnot
}
static bool inotify_should_send_event(struct fsnotify_group *group, struct inode *inode,
__u32 mask, void *data, int data_type)
struct vfsmount *mnt, __u32 mask, void *data,
int data_type)
{
struct fsnotify_mark_entry *entry;
bool send;

3
include/linux/fsnotify_backend.h
View File

@ -79,7 +79,8 @@ struct fsnotify_event_private_data;
*/
struct fsnotify_ops {
bool (*should_send_event)(struct fsnotify_group *group, struct inode *inode,
__u32 mask, void *data, int data_type);
struct vfsmount *mnt, __u32 mask, void *data,
int data_type);
int (*handle_event)(struct fsnotify_group *group, struct fsnotify_event *event);
void (*free_group_priv)(struct fsnotify_group *group);
void (*freeing_mark)(struct fsnotify_mark_entry *entry, struct fsnotify_group *group);

3
kernel/audit_tree.c
View File

@ -920,7 +920,8 @@ static void audit_tree_freeing_mark(struct fsnotify_mark_entry *entry, struct fs
}
static bool audit_tree_send_event(struct fsnotify_group *group, struct inode *inode,
__u32 mask, void *data, int data_type)
struct vfsmount *mnt, __u32 mask, void *data,
int data_type)
{
return 0;
}

3
kernel/audit_watch.c
View File

@ -514,7 +514,8 @@ void audit_remove_watch_rule(struct audit_krule *krule)
}
static bool audit_watch_should_send_event(struct fsnotify_group *group, struct inode *inode,
__u32 mask, void *data, int data_type)
struct vfsmount *mnt, __u32 mask, void *data,
int data_type)
{
struct fsnotify_mark_entry *entry;
bool send;