* General Public License for more details.
*/
+#include <linux/dcache.h> /* d_unlinked */
#include <linux/fs.h> /* struct inode */
#include <linux/fsnotify_backend.h>
#include <linux/inotify.h>
#include "inotify.h"
-static int inotify_handle_event(struct fsnotify_group *group, struct fsnotify_event *event)
+/*
+ * Check if 2 events contain the same information. We do not compare private data
+ * but at this moment that isn't a problem for any know fsnotify listeners.
+ */
+static bool event_compare(struct fsnotify_event *old, struct fsnotify_event *new)
+{
+ if ((old->mask == new->mask) &&
+ (old->to_tell == new->to_tell) &&
+ (old->data_type == new->data_type) &&
+ (old->name_len == new->name_len)) {
+ switch (old->data_type) {
+ case (FSNOTIFY_EVENT_INODE):
+ /* remember, after old was put on the wait_q we aren't
+ * allowed to look at the inode any more, only thing
+ * left to check was if the file_name is the same */
+ if (!old->name_len ||
+ !strcmp(old->file_name, new->file_name))
+ return true;
+ break;
+ case (FSNOTIFY_EVENT_PATH):
+ if ((old->path.mnt == new->path.mnt) &&
+ (old->path.dentry == new->path.dentry))
+ return true;
+ break;
+ case (FSNOTIFY_EVENT_NONE):
+ if (old->mask & FS_Q_OVERFLOW)
+ return true;
+ else if (old->mask & FS_IN_IGNORED)
+ return false;
+ return true;
+ };
+ }
+ return false;
+}
+
+static struct fsnotify_event *inotify_merge(struct list_head *list,
+ struct fsnotify_event *event)
{
- struct fsnotify_mark_entry *entry;
- struct inotify_inode_mark_entry *ientry;
+ struct fsnotify_event_holder *last_holder;
+ struct fsnotify_event *last_event;
+
+ /* and the list better be locked by something too */
+ spin_lock(&event->lock);
+
+ last_holder = list_entry(list->prev, struct fsnotify_event_holder, event_list);
+ last_event = last_holder->event;
+ if (event_compare(last_event, event))
+ fsnotify_get_event(last_event);
+ else
+ last_event = NULL;
+
+ spin_unlock(&event->lock);
+
+ return last_event;
+}
+
+static int inotify_handle_event(struct fsnotify_group *group,
+ struct fsnotify_mark *inode_mark,
+ struct fsnotify_mark *vfsmount_mark,
+ struct fsnotify_event *event)
+{
+ struct inotify_inode_mark *i_mark;
struct inode *to_tell;
struct inotify_event_private_data *event_priv;
struct fsnotify_event_private_data *fsn_event_priv;
- int wd, ret;
+ struct fsnotify_event *added_event;
+ int wd, ret = 0;
+
+ BUG_ON(vfsmount_mark);
+
+ pr_debug("%s: group=%p event=%p to_tell=%p mask=%x\n", __func__, group,
+ event, event->to_tell, event->mask);
to_tell = event->to_tell;
- spin_lock(&to_tell->i_lock);
- entry = fsnotify_find_mark_entry(group, to_tell);
- spin_unlock(&to_tell->i_lock);
- /* race with watch removal? We already passes should_send */
- if (unlikely(!entry))
- return 0;
- ientry = container_of(entry, struct inotify_inode_mark_entry,
- fsn_entry);
- wd = ientry->wd;
+ i_mark = container_of(inode_mark, struct inotify_inode_mark,
+ fsn_mark);
+ wd = i_mark->wd;
event_priv = kmem_cache_alloc(event_priv_cachep, GFP_KERNEL);
if (unlikely(!event_priv))
fsn_event_priv->group = group;
event_priv->wd = wd;
- ret = fsnotify_add_notify_event(group, event, fsn_event_priv);
- if (ret) {
+ added_event = fsnotify_add_notify_event(group, event, fsn_event_priv, inotify_merge);
+ if (added_event) {
inotify_free_event_priv(fsn_event_priv);
- /* EEXIST says we tail matched, EOVERFLOW isn't something
- * to report up the stack. */
- if ((ret == -EEXIST) ||
- (ret == -EOVERFLOW))
- ret = 0;
+ if (!IS_ERR(added_event))
+ fsnotify_put_event(added_event);
+ else
+ ret = PTR_ERR(added_event);
}
- /*
- * If we hold the entry until after the event is on the queue
- * IN_IGNORED won't be able to pass this event in the queue
- */
- fsnotify_put_mark(entry);
+ if (inode_mark->mask & IN_ONESHOT)
+ fsnotify_destroy_mark(inode_mark);
return ret;
}
-static void inotify_freeing_mark(struct fsnotify_mark_entry *entry, struct fsnotify_group *group)
+static void inotify_freeing_mark(struct fsnotify_mark *fsn_mark, struct fsnotify_group *group)
{
- inotify_ignored_and_remove_idr(entry, group);
+ inotify_ignored_and_remove_idr(fsn_mark, group);
}
-static bool inotify_should_send_event(struct fsnotify_group *group, struct inode *inode, __u32 mask)
+static bool inotify_should_send_event(struct fsnotify_group *group, struct inode *inode,
+ struct fsnotify_mark *inode_mark,
+ struct fsnotify_mark *vfsmount_mark,
+ __u32 mask, void *data, int data_type)
{
- struct fsnotify_mark_entry *entry;
- bool send;
-
- spin_lock(&inode->i_lock);
- entry = fsnotify_find_mark_entry(group, inode);
- spin_unlock(&inode->i_lock);
- if (!entry)
- return false;
+ if ((inode_mark->mask & FS_EXCL_UNLINK) &&
+ (data_type == FSNOTIFY_EVENT_PATH)) {
+ struct path *path = data;
- mask = (mask & ~FS_EVENT_ON_CHILD);
- send = (entry->mask & mask);
-
- /* find took a reference */
- fsnotify_put_mark(entry);
+ if (d_unlinked(path->dentry))
+ return false;
+ }
- return send;
+ return true;
}
/*
*/
static int idr_callback(int id, void *p, void *data)
{
- struct fsnotify_mark_entry *entry;
- struct inotify_inode_mark_entry *ientry;
+ struct fsnotify_mark *fsn_mark;
+ struct inotify_inode_mark *i_mark;
static bool warned = false;
if (warned)
return 0;
warned = true;
- entry = p;
- ientry = container_of(entry, struct inotify_inode_mark_entry, fsn_entry);
+ fsn_mark = p;
+ i_mark = container_of(fsn_mark, struct inotify_inode_mark, fsn_mark);
- WARN(1, "inotify closing but id=%d for entry=%p in group=%p still in "
+ WARN(1, "inotify closing but id=%d for fsn_mark=%p in group=%p still in "
"idr. Probably leaking memory\n", id, p, data);
/*
* out why we got here and the panic is no worse than the original
* BUG() that was here.
*/
- if (entry)
- printk(KERN_WARNING "entry->group=%p inode=%p wd=%d\n",
- entry->group, entry->inode, ientry->wd);
+ if (fsn_mark)
+ printk(KERN_WARNING "fsn_mark->group=%p inode=%p wd=%d\n",
+ fsn_mark->group, fsn_mark->i.inode, i_mark->wd);
return 0;
}
git.samba.org / sfrench / cifs-2.6.git / blobdiff