[PATCH] kill altroot

[linux-2.6-block.git] / fs / namei.c

diff --git a/fs/namei.c b/fs/namei.c
index 6c76e1ee9c4584fdc019882bd2849c00180a05e2..095818089ac10c71e47f7e0ce55e1110fec1afe7 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -31,7 +31,6 @@
 #include <linux/file.h>
 #include <linux/fcntl.h>
 #include <linux/device_cgroup.h>
-#include <asm/namei.h>
 #include <asm/uaccess.h>
 
 #define ACC_MODE(x) ("\000\004\002\006"[(x)&O_ACCMODE])
@@ -562,27 +561,16 @@ out_unlock:
        return result;
 }
 
-static int __emul_lookup_dentry(const char *, struct nameidata *);
-
 /* SMP-safe */
-static __always_inline int
+static __always_inline void
 walk_init_root(const char *name, struct nameidata *nd)
 {
        struct fs_struct *fs = current->fs;
 
        read_lock(&fs->lock);
-       if (fs->altroot.dentry && !(nd->flags & LOOKUP_NOALT)) {
-               nd->path = fs->altroot;
-               path_get(&fs->altroot);
-               read_unlock(&fs->lock);
-               if (__emul_lookup_dentry(name,nd))
-                       return 0;
-               read_lock(&fs->lock);
-       }
        nd->path = fs->root;
        path_get(&fs->root);
        read_unlock(&fs->lock);
-       return 1;
 }
 
 /*
@@ -623,12 +611,9 @@ static __always_inline int __vfs_follow_link(struct nameidata *nd, const char *l
 
        if (*link == '/') {
                path_put(&nd->path);
-               if (!walk_init_root(link, nd))
-                       /* weird __emul_prefix() stuff did it */
-                       goto out;
+               walk_init_root(link, nd);
        }
        res = link_path_walk(link, nd);
-out:
        if (nd->depth || res || nd->last_type!=LAST_NORM)
                return res;
        /*
@@ -1077,67 +1062,6 @@ static int path_walk(const char *name, struct nameidata *nd)
        return link_path_walk(name, nd);
 }
 
-/* 
- * SMP-safe: Returns 1 and nd will have valid dentry and mnt, if
- * everything is done. Returns 0 and drops input nd, if lookup failed;
- */
-static int __emul_lookup_dentry(const char *name, struct nameidata *nd)
-{
-       if (path_walk(name, nd))
-               return 0;               /* something went wrong... */
-
-       if (!nd->path.dentry->d_inode ||
-           S_ISDIR(nd->path.dentry->d_inode->i_mode)) {
-               struct path old_path = nd->path;
-               struct qstr last = nd->last;
-               int last_type = nd->last_type;
-               struct fs_struct *fs = current->fs;
-
-               /*
-                * NAME was not found in alternate root or it's a directory.
-                * Try to find it in the normal root:
-                */
-               nd->last_type = LAST_ROOT;
-               read_lock(&fs->lock);
-               nd->path = fs->root;
-               path_get(&fs->root);
-               read_unlock(&fs->lock);
-               if (path_walk(name, nd) == 0) {
-                       if (nd->path.dentry->d_inode) {
-                               path_put(&old_path);
-                               return 1;
-                       }
-                       path_put(&nd->path);
-               }
-               nd->path = old_path;
-               nd->last = last;
-               nd->last_type = last_type;
-       }
-       return 1;
-}
-
-void set_fs_altroot(void)
-{
-       char *emul = __emul_prefix();
-       struct nameidata nd;
-       struct path path = {}, old_path;
-       int err;
-       struct fs_struct *fs = current->fs;
-
-       if (!emul)
-               goto set_it;
-       err = path_lookup(emul, LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_NOALT, &nd);
-       if (!err)
-               path = nd.path;
-set_it:
-       write_lock(&fs->lock);
-       old_path = fs->altroot;
-       fs->altroot = path;
-       write_unlock(&fs->lock);
-       if (old_path.dentry)
-               path_put(&old_path);
-}
-
 /* Returns 0 and nd will be valid on success; Retuns error, otherwise. */
 static int do_path_lookup(int dfd, const char *name,
                                unsigned int flags, struct nameidata *nd)
@@ -1153,14 +1077,6 @@ static int do_path_lookup(int dfd, const char *name,
 
        if (*name=='/') {
                read_lock(&fs->lock);
-               if (fs->altroot.dentry && !(nd->flags & LOOKUP_NOALT)) {
-                       nd->path = fs->altroot;
-                       path_get(&fs->altroot);
-                       read_unlock(&fs->lock);
-                       if (__emul_lookup_dentry(name,nd))
-                               goto out; /* found in altroot */
-                       read_lock(&fs->lock);
-               }
                nd->path = fs->root;
                path_get(&fs->root);
                read_unlock(&fs->lock);
@@ -1194,7 +1110,6 @@ static int do_path_lookup(int dfd, const char *name,
        }
 
        retval = path_walk(name, nd);
-out:
        if (unlikely(!retval && !audit_dummy_context() && nd->path.dentry &&
                                nd->path.dentry->d_inode))
                audit_inode(name, nd->path.dentry);