#include <asm/ioctls.h>
static atomic_t inotify_cookie;
-static atomic_t inotify_watches;
-static kmem_cache_t *watch_cachep;
-static kmem_cache_t *event_cachep;
+static kmem_cache_t *watch_cachep __read_mostly;
+static kmem_cache_t *event_cachep __read_mostly;
-static struct vfsmount *inotify_mnt;
+static struct vfsmount *inotify_mnt __read_mostly;
/* these are configurable via /proc/sys/fs/inotify/ */
-int inotify_max_user_instances;
-int inotify_max_user_watches;
-int inotify_max_queued_events;
+int inotify_max_user_instances __read_mostly;
+int inotify_max_user_watches __read_mostly;
+int inotify_max_queued_events __read_mostly;
/*
* Lock ordering:
*
* dentry->d_lock (used to keep d_move() away from dentry->d_parent)
- * iprune_sem (synchronize shrink_icache_memory())
+ * iprune_mutex (synchronize shrink_icache_memory())
* inode_lock (protects the super_block->s_inodes list)
* inode->inotify_mutex (protects inode->inotify_watches and watches->i_list)
* inotify_dev->mutex (protects inotify_device and watches->d_list)
return error;
}
+/*
+ * inotify_inode_watched - returns nonzero if there are watches on this inode
+ * and zero otherwise. We call this lockless, we do not care if we race.
+ */
+static inline int inotify_inode_watched(struct inode *inode)
+{
+ return !list_empty(&inode->inotify_watches);
+}
+
+/*
+ * Get child dentry flag into synch with parent inode.
+ * Flag should always be clear for negative dentrys.
+ */
+static void set_dentry_child_flags(struct inode *inode, int watched)
+{
+ struct dentry *alias;
+
+ spin_lock(&dcache_lock);
+ list_for_each_entry(alias, &inode->i_dentry, d_alias) {
+ struct dentry *child;
+
+ list_for_each_entry(child, &alias->d_subdirs, d_u.d_child) {
+ if (!child->d_inode) {
+ WARN_ON(child->d_flags & DCACHE_INOTIFY_PARENT_WATCHED);
+ continue;
+ }
+ spin_lock(&child->d_lock);
+ if (watched) {
+ WARN_ON(child->d_flags &
+ DCACHE_INOTIFY_PARENT_WATCHED);
+ child->d_flags |= DCACHE_INOTIFY_PARENT_WATCHED;
+ } else {
+ WARN_ON(!(child->d_flags &
+ DCACHE_INOTIFY_PARENT_WATCHED));
+ child->d_flags&=~DCACHE_INOTIFY_PARENT_WATCHED;
+ }
+ spin_unlock(&child->d_lock);
+ }
+ }
+ spin_unlock(&dcache_lock);
+}
+
/*
* create_watch - creates a watch on the given device.
*
get_inotify_watch(watch);
atomic_inc(&dev->user->inotify_watches);
- atomic_inc(&inotify_watches);
return watch;
}
list_del(&watch->i_list);
list_del(&watch->d_list);
+ if (!inotify_inode_watched(watch->inode))
+ set_dentry_child_flags(watch->inode, 0);
+
atomic_dec(&dev->user->inotify_watches);
- atomic_dec(&inotify_watches);
idr_remove(&dev->idr, watch->wd);
put_inotify_watch(watch);
}
remove_watch_no_event(watch, dev);
}
+/* Kernel API */
+
/*
- * inotify_inode_watched - returns nonzero if there are watches on this inode
- * and zero otherwise. We call this lockless, we do not care if we race.
+ * inotify_d_instantiate - instantiate dcache entry for inode
*/
-static inline int inotify_inode_watched(struct inode *inode)
+void inotify_d_instantiate(struct dentry *entry, struct inode *inode)
{
- return !list_empty(&inode->inotify_watches);
+ struct dentry *parent;
+
+ if (!inode)
+ return;
+
+ WARN_ON(entry->d_flags & DCACHE_INOTIFY_PARENT_WATCHED);
+ spin_lock(&entry->d_lock);
+ parent = entry->d_parent;
+ if (parent->d_inode && inotify_inode_watched(parent->d_inode))
+ entry->d_flags |= DCACHE_INOTIFY_PARENT_WATCHED;
+ spin_unlock(&entry->d_lock);
}
-/* Kernel API */
+/*
+ * inotify_d_move - dcache entry has been moved
+ */
+void inotify_d_move(struct dentry *entry)
+{
+ struct dentry *parent;
+
+ parent = entry->d_parent;
+ if (inotify_inode_watched(parent->d_inode))
+ entry->d_flags |= DCACHE_INOTIFY_PARENT_WATCHED;
+ else
+ entry->d_flags &= ~DCACHE_INOTIFY_PARENT_WATCHED;
+}
/**
* inotify_inode_queue_event - queue an event to all watches on this inode
struct dentry *parent;
struct inode *inode;
- if (!atomic_read (&inotify_watches))
+ if (!(dentry->d_flags & DCACHE_INOTIFY_PARENT_WATCHED))
return;
spin_lock(&dentry->d_lock);
* @list: list of inodes being unmounted (sb->s_inodes)
*
* Called with inode_lock held, protecting the unmounting super block's list
- * of inodes, and with iprune_sem held, keeping shrink_icache_memory() at bay.
+ * of inodes, and with iprune_mutex held, keeping shrink_icache_memory() at bay.
* We temporarily drop inode_lock, however, and CAN block.
*/
void inotify_unmount_inodes(struct list_head *list)
* We can safely drop inode_lock here because we hold
* references on both inode and next_i. Also no new inodes
* will be added since the umount has begun. Finally,
- * iprune_sem keeps shrink_icache_memory() away.
+ * iprune_mutex keeps shrink_icache_memory() away.
*/
spin_unlock(&inode_lock);
return ret;
}
-static struct file_operations inotify_fops = {
+static const struct file_operations inotify_fops = {
.poll = inotify_poll,
.read = inotify_read,
.release = inotify_release,
goto out;
}
+ if (!inotify_inode_watched(inode))
+ set_dentry_child_flags(inode, 1);
+
/* Add the watch to the device's and the inode's list */
list_add(&watch->d_list, &dev->watches);
list_add(&watch->i_list, &inode->inotify_watches);
inotify_max_user_watches = 8192;
atomic_set(&inotify_cookie, 0);
- atomic_set(&inotify_watches, 0);
watch_cachep = kmem_cache_create("inotify_watch_cache",
sizeof(struct inotify_watch),