[PATCH] bitops: hweight() related cleanup

[linux-2.6.git] / ipc / mqueue.c

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 3a926011507b8768ff9991b55837a3f7ee9f579e..a3bb0c8201c7943b8c95cc7623fbb37d8ae2df97 100644 (file)
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -2,7 +2,7 @@
  * POSIX message queues filesystem for Linux.
  *
  * Copyright (C) 2003,2004  Krzysztof Benedyczak    (golbi@mat.uni.torun.pl)
- *                          Michal Wronski          (wrona@mat.uni.torun.pl)
+ *                          Michal Wronski          (Michal.Wronski@motorola.com)
  *
  * Spinlocks:               Mohamed Abbas           (abbas.mohamed@intel.com)
  * Lockless receive & send, fd based notify:
@@ -11,6 +11,7 @@
  * This file is released under the GPL.
  */
 
+#include <linux/capability.h>
 #include <linux/init.h>
 #include <linux/pagemap.h>
 #include <linux/file.h>
@@ -24,6 +25,8 @@
 #include <linux/netlink.h>
 #include <linux/syscalls.h>
 #include <linux/signal.h>
+#include <linux/mutex.h>
+
 #include <net/sock.h>
 #include "util.h"
 
@@ -50,7 +53,6 @@
 #define HARD_MSGMAX    (131072/sizeof(void*))
 #define DFLT_MSGSIZEMAX 8192   /* max message size */
 
-#define NOTIFY_COOKIE_LEN      32
 
 struct ext_wait_queue {                /* queue of sleeping tasks */
        struct task_struct *task;
@@ -598,29 +600,32 @@ static int mq_attr_ok(struct mq_attr *attr)
 static struct file *do_create(struct dentry *dir, struct dentry *dentry,
                        int oflag, mode_t mode, struct mq_attr __user *u_attr)
 {
-       struct file *filp;
        struct mq_attr attr;
        int ret;
 
-       if (u_attr != NULL) {
+       if (u_attr) {
+               ret = -EFAULT;
                if (copy_from_user(&attr, u_attr, sizeof(attr)))
-                       return ERR_PTR(-EFAULT);
+                       goto out;
+               ret = -EINVAL;
                if (!mq_attr_ok(&attr))
-                       return ERR_PTR(-EINVAL);
+                       goto out;
                /* store for use during create */
                dentry->d_fsdata = &attr;
        }
 
+       mode &= ~current->fs->umask;
        ret = vfs_create(dir->d_inode, dentry, mode, NULL);
        dentry->d_fsdata = NULL;
        if (ret)
-               return ERR_PTR(ret);
+               goto out;
 
-       filp = dentry_open(dentry, mqueue_mnt, oflag);
-       if (!IS_ERR(filp))
-               dget(dentry);
+       return dentry_open(dentry, mqueue_mnt, oflag);
 
-       return filp;
+out:
+       dput(dentry);
+       mntput(mqueue_mnt);
+       return ERR_PTR(ret);
 }
 
 /* Opens existing queue */
@@ -628,20 +633,20 @@ static struct file *do_open(struct dentry *dentry, int oflag)
 {
 static int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
                                        MAY_READ | MAY_WRITE };
-       struct file *filp;
 
-       if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY))
+       if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) {
+               dput(dentry);
+               mntput(mqueue_mnt);
                return ERR_PTR(-EINVAL);
+       }
 
-       if (permission(dentry->d_inode, oflag2acc[oflag & O_ACCMODE], NULL))
+       if (permission(dentry->d_inode, oflag2acc[oflag & O_ACCMODE], NULL)) {
+               dput(dentry);
+               mntput(mqueue_mnt);
                return ERR_PTR(-EACCES);
+       }
 
-       filp = dentry_open(dentry, mqueue_mnt, oflag);
-
-       if (!IS_ERR(filp))
-               dget(dentry);
-
-       return filp;
+       return dentry_open(dentry, mqueue_mnt, oflag);
 }
 
 asmlinkage long sys_mq_open(const char __user *u_name, int oflag, mode_t mode,
@@ -659,7 +664,7 @@ asmlinkage long sys_mq_open(const char __user *u_name, int oflag, mode_t mode,
        if (fd < 0)
                goto out_putname;
 
-       down(&mqueue_mnt->mnt_root->d_inode->i_sem);
+       mutex_lock(&mqueue_mnt->mnt_root->d_inode->i_mutex);
        dentry = lookup_one_len(name, mqueue_mnt->mnt_root, strlen(name));
        if (IS_ERR(dentry)) {
                error = PTR_ERR(dentry);
@@ -669,17 +674,20 @@ asmlinkage long sys_mq_open(const char __user *u_name, int oflag, mode_t mode,
 
        if (oflag & O_CREAT) {
                if (dentry->d_inode) {  /* entry already exists */
-                       filp = (oflag & O_EXCL) ? ERR_PTR(-EEXIST) :
-                                       do_open(dentry, oflag);
+                       error = -EEXIST;
+                       if (oflag & O_EXCL)
+                               goto out;
+                       filp = do_open(dentry, oflag);
                } else {
                        filp = do_create(mqueue_mnt->mnt_root, dentry,
                                                oflag, mode, u_attr);
                }
-       } else
-               filp = (dentry->d_inode) ? do_open(dentry, oflag) :
-                                       ERR_PTR(-ENOENT);
-
-       dput(dentry);
+       } else {
+               error = -ENOENT;
+               if (!dentry->d_inode)
+                       goto out;
+               filp = do_open(dentry, oflag);
+       }
 
        if (IS_ERR(filp)) {
                error = PTR_ERR(filp);
@@ -690,13 +698,15 @@ asmlinkage long sys_mq_open(const char __user *u_name, int oflag, mode_t mode,
        fd_install(fd, filp);
        goto out_upsem;
 
-out_putfd:
+out:
+       dput(dentry);
        mntput(mqueue_mnt);
+out_putfd:
        put_unused_fd(fd);
 out_err:
        fd = error;
 out_upsem:
-       up(&mqueue_mnt->mnt_root->d_inode->i_sem);
+       mutex_unlock(&mqueue_mnt->mnt_root->d_inode->i_mutex);
 out_putname:
        putname(name);
        return fd;
@@ -713,7 +723,7 @@ asmlinkage long sys_mq_unlink(const char __user *u_name)
        if (IS_ERR(name))
                return PTR_ERR(name);
 
-       down(&mqueue_mnt->mnt_root->d_inode->i_sem);
+       mutex_lock(&mqueue_mnt->mnt_root->d_inode->i_mutex);
        dentry = lookup_one_len(name, mqueue_mnt->mnt_root, strlen(name));
        if (IS_ERR(dentry)) {
                err = PTR_ERR(dentry);
@@ -734,7 +744,7 @@ out_err:
        dput(dentry);
 
 out_unlock:
-       up(&mqueue_mnt->mnt_root->d_inode->i_sem);
+       mutex_unlock(&mqueue_mnt->mnt_root->d_inode->i_mutex);
        putname(name);
        if (inode)
                iput(inode);
@@ -752,7 +762,7 @@ out_unlock:
  * The receiver accepts the message and returns without grabbing the queue
  * spinlock. Therefore an intermediate STATE_PENDING state and memory barriers
  * are necessary. The same algorithm is used for sysv semaphores, see
- * ipc/sem.c fore more details.
+ * ipc/mutex.c fore more details.
  *
  * The same algorithm is used for senders.
  */
@@ -1009,7 +1019,8 @@ retry:
                                goto out;
                        }
 
-                       ret = netlink_attachskb(sock, nc, 0, MAX_SCHEDULE_TIMEOUT);
+                       ret = netlink_attachskb(sock, nc, 0,
+                                       MAX_SCHEDULE_TIMEOUT, NULL);
                        if (ret == 1)
                                goto retry;
                        if (ret) {