[PATCH] inotify: misc. cleanup

Miscellaneous invariant clean up, comment fixes, and so on.  Trivial
stuff.

Signed-off-by: Robert Love <rml@novell.com>
Signed-off-by: John McCutchan <ttb@tentacle.dhs.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 32 insertions, 34 deletions

diff --git a/fs/inotify.c b/fs/inotify.c
index 54757be888b..a87926584cd 100644
--- a/fs/inotify.c
+++ b/fs/inotify.c
@@ -62,8 +62,8 @@ int inotify_max_queued_events;
  * Lifetimes of the three main data structures--inotify_device, inode, and
  * inotify_watch--are managed by reference count.
  *
- * inotify_device: Lifetime is from open until release.  Additional references
- * can bump the count via get_inotify_dev() and drop the count via
+ * inotify_device: Lifetime is from inotify_init() until release.  Additional
+ * references can bump the count via get_inotify_dev() and drop the count via
  * put_inotify_dev().
  *
  * inotify_watch: Lifetime is from create_watch() to destory_watch().
@@ -75,7 +75,7 @@ int inotify_max_queued_events;
  */
 
 /*
- * struct inotify_device - represents an open instance of an inotify device
+ * struct inotify_device - represents an inotify instance
  *
  * This structure is protected by the semaphore 'sem'.
  */
@@ -371,7 +371,7 @@ static int find_inode(const char __user *dirname, struct nameidata *nd)
         /* you can only watch an inode if you have read permissions on it */
         error = permission(nd->dentry->d_inode, MAY_READ, NULL);
         if (error) 
-                path_release (nd);
+                path_release(nd);
         return error;
 }
 
@@ -387,7 +387,8 @@ static struct inotify_watch *create_watch(struct inotify_device *dev,
         struct inotify_watch *watch;
         int ret;
 
-        if (atomic_read(&dev->user->inotify_watches) >= inotify_max_user_watches)
+        if (atomic_read(&dev->user->inotify_watches) >=
+                        inotify_max_user_watches)
                 return ERR_PTR(-ENOSPC);
 
         watch = kmem_cache_alloc(watch_cachep, GFP_KERNEL);
@@ -783,15 +784,14 @@ static int inotify_release(struct inode *ignored, struct file *file)
                 inotify_dev_event_dequeue(dev);
         up(&dev->sem);
 
-        /* free this device: the put matching the get in inotify_open() */
+        /* free this device: the put matching the get in inotify_init() */
         put_inotify_dev(dev);
 
         return 0;
 }
 
 /*
- * inotify_ignore - handle the INOTIFY_IGNORE ioctl, asking that a given wd be
- * removed from the device.
+ * inotify_ignore - remove a given wd from this inotify instance.
  *
  * Can sleep.
  */
@@ -856,15 +856,12 @@ asmlinkage long sys_inotify_init(void)
 {
         struct inotify_device *dev;
         struct user_struct *user;
-        int ret = -ENOTTY;
-        int fd;
-        struct file *filp;
+        struct file *filp;      
+        int fd, ret;
 
         fd = get_unused_fd();
-        if (fd < 0) {
-                ret = fd;
-                goto out;
-        }
+        if (fd < 0)
+                return fd;
 
         filp = get_empty_filp();
         if (!filp) {
@@ -872,16 +869,11 @@ asmlinkage long sys_inotify_init(void)
                 ret = -ENFILE;
                 goto out;
         }
-        filp->f_op = &inotify_fops;
-        filp->f_vfsmnt = mntget(inotify_mnt);
-        filp->f_dentry = dget(inotify_mnt->mnt_root);
-        filp->f_mapping = filp->f_dentry->d_inode->i_mapping;
-        filp->f_mode = FMODE_READ;
-        filp->f_flags = O_RDONLY;
 
         user = get_uid(current->user);
 
-        if (unlikely(atomic_read(&user->inotify_devs) >= inotify_max_user_instances)) {
+        if (unlikely(atomic_read(&user->inotify_devs) >=
+                        inotify_max_user_instances)) {
                 ret = -EMFILE;
                 goto out_err;
         }
@@ -892,6 +884,14 @@ asmlinkage long sys_inotify_init(void)
                 goto out_err;
         }
 
+        filp->f_op = &inotify_fops;
+        filp->f_vfsmnt = mntget(inotify_mnt);
+        filp->f_dentry = dget(inotify_mnt->mnt_root);
+        filp->f_mapping = filp->f_dentry->d_inode->i_mapping;
+        filp->f_mode = FMODE_READ;
+        filp->f_flags = O_RDONLY;
+        filp->private_data = dev;
+
         idr_init(&dev->idr);
         INIT_LIST_HEAD(&dev->events);
         INIT_LIST_HEAD(&dev->watches);
@@ -905,9 +905,8 @@ asmlinkage long sys_inotify_init(void)
 
         get_inotify_dev(dev);
         atomic_inc(&user->inotify_devs);
+        fd_install(fd, filp);
 
-        filp->private_data = dev;
-        fd_install (fd, filp);
         return fd;
 out_err:
         put_unused_fd (fd);
@@ -917,7 +916,7 @@ out:
         return ret;
 }
 
-asmlinkage long sys_inotify_add_watch(int fd, const char *path, u32 mask)
+asmlinkage long sys_inotify_add_watch(int fd, const char __user *path, u32 mask)
 {
         struct inotify_watch *watch, *old;
         struct inode *inode;
@@ -930,21 +929,20 @@ asmlinkage long sys_inotify_add_watch(int fd, const char *path, u32 mask)
         if (!filp)
                 return -EBADF;
 
-        dev = filp->private_data;
-
-        ret = find_inode((const char __user*) path, &nd);
-        if (ret)
+        ret = find_inode(path, &nd);
+        if (unlikely(ret))
                 goto fput_and_out;
 
-        /* Held in place by reference in nd */
+        /* inode held in place by reference to nd; dev by fget on fd */
         inode = nd.dentry->d_inode;
+        dev = filp->private_data;
 
         down(&inode->inotify_sem);
         down(&dev->sem);
 
         /* don't let user-space set invalid bits: we don't want flags set */
         mask &= IN_ALL_EVENTS;
-        if (!mask) {
+        if (unlikely(!mask)) {
                 ret = -EINVAL;
                 goto out;
         }
@@ -1009,11 +1007,11 @@ static struct file_system_type inotify_fs_type = {
 };
 
 /*
- * inotify_init - Our initialization function.  Note that we cannnot return
+ * inotify_setup - Our initialization function.  Note that we cannnot return
  * error because we have compiled-in VFS hooks.  So an (unlikely) failure here
  * must result in panic().
  */
-static int __init inotify_init(void)
+static int __init inotify_setup(void)
 {
         register_filesystem(&inotify_fs_type);
         inotify_mnt = kern_mount(&inotify_fs_type);
@@ -1034,4 +1032,4 @@ static int __init inotify_init(void)
         return 0;
 }
 
-module_init(inotify_init);
+module_init(inotify_setup);