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-rw-r--r--fs/inotify.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/fs/inotify.c b/fs/inotify.c
index 2e4e2a57708..a37e9fb1da5 100644
--- a/fs/inotify.c
+++ b/fs/inotify.c
@@ -37,6 +37,7 @@
#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;
@@ -422,6 +423,7 @@ static struct inotify_watch *create_watch(struct inotify_device *dev,
get_inotify_watch(watch);
atomic_inc(&dev->user->inotify_watches);
+ atomic_inc(&inotify_watches);
return watch;
}
@@ -454,6 +456,7 @@ static void remove_watch_no_event(struct inotify_watch *watch,
list_del(&watch->d_list);
atomic_dec(&dev->user->inotify_watches);
+ atomic_dec(&inotify_watches);
idr_remove(&dev->idr, watch->wd);
put_inotify_watch(watch);
}
@@ -532,6 +535,9 @@ void inotify_dentry_parent_queue_event(struct dentry *dentry, u32 mask,
struct dentry *parent;
struct inode *inode;
+ if (!atomic_read (&inotify_watches))
+ return;
+
spin_lock(&dentry->d_lock);
parent = dentry->d_parent;
inode = parent->d_inode;
@@ -925,6 +931,7 @@ asmlinkage long sys_inotify_add_watch(int fd, const char __user *path, u32 mask)
struct nameidata nd;
struct file *filp;
int ret, fput_needed;
+ int mask_add = 0;
filp = fget_light(fd, &fput_needed);
if (unlikely(!filp))
@@ -947,6 +954,9 @@ asmlinkage long sys_inotify_add_watch(int fd, const char __user *path, u32 mask)
down(&inode->inotify_sem);
down(&dev->sem);
+ if (mask & IN_MASK_ADD)
+ mask_add = 1;
+
/* don't let user-space set invalid bits: we don't want flags set */
mask &= IN_ALL_EVENTS;
if (unlikely(!mask)) {
@@ -960,7 +970,10 @@ asmlinkage long sys_inotify_add_watch(int fd, const char __user *path, u32 mask)
*/
old = inode_find_dev(inode, dev);
if (unlikely(old)) {
- old->mask = mask;
+ if (mask_add)
+ old->mask |= mask;
+ else
+ old->mask = mask;
ret = old->wd;
goto out;
}
@@ -1043,6 +1056,7 @@ static int __init inotify_setup(void)
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),