Switch open_exec() and sys_uselib() to do_open_filp()

... and make path_lookup_open() static

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/exec.c b/fs/exec.c
index 41ae8e0..895823d 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -105,36 +105,28 @@ static inline void put_binfmt(struct linux_binfmt * fmt)
 SYSCALL_DEFINE1(uselib, const char __user *, library)
 {
        struct file *file;
-       struct nameidata nd;
        char *tmp = getname(library);
        int error = PTR_ERR(tmp);
 
-       if (!IS_ERR(tmp)) {
-               error = path_lookup_open(AT_FDCWD, tmp,
-                                        LOOKUP_FOLLOW, &nd,
-                                        FMODE_READ|FMODE_EXEC);
-               putname(tmp);
-       }
-       if (error)
+       if (IS_ERR(tmp))
+               goto out;
+
+       file = do_filp_open(AT_FDCWD, tmp,
+                               O_LARGEFILE | O_RDONLY | FMODE_EXEC, 0,
+                               MAY_READ | MAY_EXEC | MAY_OPEN);
+       putname(tmp);
+       error = PTR_ERR(file);
+       if (IS_ERR(file))
                goto out;
 
        error = -EINVAL;
-       if (!S_ISREG(nd.path.dentry->d_inode->i_mode))
+       if (!S_ISREG(file->f_path.dentry->d_inode->i_mode))
                goto exit;
 
        error = -EACCES;
-       if (nd.path.mnt->mnt_flags & MNT_NOEXEC)
-               goto exit;
-
-       error = may_open(&nd.path, MAY_READ | MAY_EXEC | MAY_OPEN, 0);
-       if (error)
+       if (file->f_path.mnt->mnt_flags & MNT_NOEXEC)
                goto exit;
 
-       file = nameidata_to_filp(&nd, O_RDONLY|O_LARGEFILE);
-       error = PTR_ERR(file);
-       if (IS_ERR(file))
-               goto out;
-
        fsnotify_open(file->f_path.dentry);
 
        error = -ENOEXEC;
@@ -156,13 +148,10 @@ SYSCALL_DEFINE1(uselib, const char __user *, library)
                }
                read_unlock(&binfmt_lock);
        }
+exit:
        fput(file);
 out:
        return error;
-exit:
-       release_open_intent(&nd);
-       path_put(&nd.path);
-       goto out;
 }
 
 #ifdef CONFIG_MMU
@@ -657,44 +646,33 @@ EXPORT_SYMBOL(setup_arg_pages);
 
 struct file *open_exec(const char *name)
 {
-       struct nameidata nd;
        struct file *file;
        int err;
 
-       err = path_lookup_open(AT_FDCWD, name, LOOKUP_FOLLOW, &nd,
-                               FMODE_READ|FMODE_EXEC);
-       if (err)
+       file = do_filp_open(AT_FDCWD, name,
+                               O_LARGEFILE | O_RDONLY | FMODE_EXEC, 0,
+                               MAY_EXEC | MAY_OPEN);
+       if (IS_ERR(file))
                goto out;
 
        err = -EACCES;
-       if (!S_ISREG(nd.path.dentry->d_inode->i_mode))
-               goto out_path_put;
-
-       if (nd.path.mnt->mnt_flags & MNT_NOEXEC)
-               goto out_path_put;
-
-       err = may_open(&nd.path, MAY_EXEC | MAY_OPEN, 0);
-       if (err)
-               goto out_path_put;
+       if (!S_ISREG(file->f_path.dentry->d_inode->i_mode))
+               goto exit;
 
-       file = nameidata_to_filp(&nd, O_RDONLY|O_LARGEFILE);
-       if (IS_ERR(file))
-               return file;
+       if (file->f_path.mnt->mnt_flags & MNT_NOEXEC)
+               goto exit;
 
        fsnotify_open(file->f_path.dentry);
 
        err = deny_write_access(file);
-       if (err) {
-               fput(file);
-               goto out;
-       }
+       if (err)
+               goto exit;
 
+out:
        return file;
 
- out_path_put:
-       release_open_intent(&nd);
-       path_put(&nd.path);
- out:
+exit:
+       fput(file);
        return ERR_PTR(err);
 }
 EXPORT_SYMBOL(open_exec);

diff --git a/fs/namei.c b/fs/namei.c
index 78f253c..967c3db 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1130,8 +1130,8 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
  * @nd: pointer to nameidata
  * @open_flags: open intent flags
  */
-int path_lookup_open(int dfd, const char *name, unsigned int lookup_flags,
-               struct nameidata *nd, int open_flags)
+static int path_lookup_open(int dfd, const char *name,
+               unsigned int lookup_flags, struct nameidata *nd, int open_flags)
 {
        struct file *filp = get_empty_filp();
        int err;
@@ -1637,18 +1637,19 @@ static int open_will_write_to_fs(int flag, struct inode *inode)
  * open_to_namei_flags() for more details.
  */
 struct file *do_filp_open(int dfd, const char *pathname,
-               int open_flag, int mode)
+               int open_flag, int mode, int acc_mode)
 {
        struct file *filp;
        struct nameidata nd;
-       int acc_mode, error;
+       int error;
        struct path path;
        struct dentry *dir;
        int count = 0;
        int will_write;
        int flag = open_to_namei_flags(open_flag);
 
-       acc_mode = MAY_OPEN | ACC_MODE(flag);
+       if (!acc_mode)
+               acc_mode = MAY_OPEN | ACC_MODE(flag);
 
        /* O_TRUNC implies we need access checks for write permissions */
        if (flag & O_TRUNC)
@@ -1869,7 +1870,7 @@ do_link:
  */
 struct file *filp_open(const char *filename, int flags, int mode)
 {
-       return do_filp_open(AT_FDCWD, filename, flags, mode);
+       return do_filp_open(AT_FDCWD, filename, flags, mode, 0);
 }
 EXPORT_SYMBOL(filp_open);
 

diff --git a/fs/open.c b/fs/open.c
index 377eb25..bdfbf03 100644 (file)
--- a/fs/open.c
+++ b/fs/open.c
@@ -1033,7 +1033,7 @@ long do_sys_open(int dfd, const char __user *filename, int flags, int mode)
        if (!IS_ERR(tmp)) {
                fd = get_unused_fd_flags(flags);
                if (fd >= 0) {
-                       struct file *f = do_filp_open(dfd, tmp, flags, mode);
+                       struct file *f = do_filp_open(dfd, tmp, flags, mode, 0);
                        if (IS_ERR(f)) {
                                put_unused_fd(fd);
                                fd = PTR_ERR(f);

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 11484d0..ed78842 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2118,7 +2118,7 @@ extern struct file *create_write_pipe(int flags);
 extern void free_write_pipe(struct file *);
 
 extern struct file *do_filp_open(int dfd, const char *pathname,
-               int open_flag, int mode);
+               int open_flag, int mode, int acc_mode);
 extern int may_open(struct path *, int, int);
 
 extern int kernel_read(struct file *, unsigned long, char *, unsigned long);

diff --git a/include/linux/namei.h b/include/linux/namei.h
index fc2e035..518098f 100644 (file)
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -69,7 +69,6 @@ extern int path_lookup(const char *, unsigned, struct nameidata *);
 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
                           const char *, unsigned int, struct nameidata *);
 
-extern int path_lookup_open(int dfd, const char *name, unsigned lookup_flags, struct nameidata *, int open_flags);
 extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
                int (*open)(struct inode *, struct file *));
 extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);