[PATCH] capable/capability.h (fs/)

[powerpc.git] / fs / namespace.c

diff --git a/fs/namespace.c b/fs/namespace.c
index 2019899..8bc15b3 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -16,6 +16,7 @@
 #include <linux/init.h>
 #include <linux/quotaops.h>
 #include <linux/acct.h>
+#include <linux/capability.h>
 #include <linux/module.h>
 #include <linux/seq_file.h>
 #include <linux/namespace.h>
@@ -355,14 +356,14 @@ static int show_vfsmnt(struct seq_file *m, void *v)
                { MS_SYNCHRONOUS, ",sync" },
                { MS_DIRSYNC, ",dirsync" },
                { MS_MANDLOCK, ",mand" },
-               { MS_NOATIME, ",noatime" },
-               { MS_NODIRATIME, ",nodiratime" },
                { 0, NULL }
        };
        static struct proc_fs_info mnt_info[] = {
                { MNT_NOSUID, ",nosuid" },
                { MNT_NODEV, ",nodev" },
                { MNT_NOEXEC, ",noexec" },
+               { MNT_NOATIME, ",noatime" },
+               { MNT_NODIRATIME, ",nodiratime" },
                { 0, NULL }
        };
        struct proc_fs_info *fs_infop;
@@ -451,7 +452,7 @@ EXPORT_SYMBOL(may_umount);
 void release_mounts(struct list_head *head)
 {
        struct vfsmount *mnt;
-       while(!list_empty(head)) {
+       while (!list_empty(head)) {
                mnt = list_entry(head->next, struct vfsmount, mnt_hash);
                list_del_init(&mnt->mnt_hash);
                if (mnt->mnt_parent != mnt) {
@@ -814,7 +815,7 @@ static int graft_tree(struct vfsmount *mnt, struct nameidata *nd)
                return -ENOTDIR;
 
        err = -ENOENT;
-       down(&nd->dentry->d_inode->i_sem);
+       mutex_lock(&nd->dentry->d_inode->i_mutex);
        if (IS_DEADDIR(nd->dentry->d_inode))
                goto out_unlock;
 
@@ -826,7 +827,7 @@ static int graft_tree(struct vfsmount *mnt, struct nameidata *nd)
        if (IS_ROOT(nd->dentry) || !d_unhashed(nd->dentry))
                err = attach_recursive_mnt(mnt, nd, NULL);
 out_unlock:
-       up(&nd->dentry->d_inode->i_sem);
+       mutex_unlock(&nd->dentry->d_inode->i_mutex);
        if (!err)
                security_sb_post_addmount(mnt, nd);
        return err;
@@ -962,7 +963,7 @@ static int do_move_mount(struct nameidata *nd, char *old_name)
                goto out;
 
        err = -ENOENT;
-       down(&nd->dentry->d_inode->i_sem);
+       mutex_lock(&nd->dentry->d_inode->i_mutex);
        if (IS_DEADDIR(nd->dentry->d_inode))
                goto out1;
 
@@ -1004,7 +1005,7 @@ static int do_move_mount(struct nameidata *nd, char *old_name)
        list_del_init(&old_nd.mnt->mnt_expire);
        spin_unlock(&vfsmount_lock);
 out1:
-       up(&nd->dentry->d_inode->i_sem);
+       mutex_unlock(&nd->dentry->d_inode->i_mutex);
 out:
        up_write(&namespace_sem);
        if (!err)
@@ -1286,7 +1287,13 @@ long do_mount(char *dev_name, char *dir_name, char *type_page,
                mnt_flags |= MNT_NODEV;
        if (flags & MS_NOEXEC)
                mnt_flags |= MNT_NOEXEC;
-       flags &= ~(MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_ACTIVE);
+       if (flags & MS_NOATIME)
+               mnt_flags |= MNT_NOATIME;
+       if (flags & MS_NODIRATIME)
+               mnt_flags |= MNT_NODIRATIME;
+
+       flags &= ~(MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_ACTIVE |
+                  MS_NOATIME | MS_NODIRATIME);
 
        /* ... and get the mountpoint */
        retval = path_lookup(dir_name, LOOKUP_FOLLOW, &nd);
@@ -1526,6 +1533,10 @@ static void chroot_fs_refs(struct nameidata *old_nd, struct nameidata *new_nd)
  * pointed to by put_old must yield the same directory as new_root. No other
  * file system may be mounted on put_old. After all, new_root is a mountpoint.
  *
+ * Also, the current root cannot be on the 'rootfs' (initial ramfs) filesystem.
+ * See Documentation/filesystems/ramfs-rootfs-initramfs.txt for alternatives
+ * in this situation.
+ *
  * Notes:
  *  - we don't move root/cwd if they are not at the root (reason: if something
  *    cared enough to change them, it's probably wrong to force them elsewhere)
@@ -1569,7 +1580,7 @@ asmlinkage long sys_pivot_root(const char __user * new_root,
        user_nd.dentry = dget(current->fs->root);
        read_unlock(&current->fs->lock);
        down_write(&namespace_sem);
-       down(&old_nd.dentry->d_inode->i_sem);
+       mutex_lock(&old_nd.dentry->d_inode->i_mutex);
        error = -EINVAL;
        if (IS_MNT_SHARED(old_nd.mnt) ||
                IS_MNT_SHARED(new_nd.mnt->mnt_parent) ||
@@ -1622,7 +1633,7 @@ asmlinkage long sys_pivot_root(const char __user * new_root,
        path_release(&root_parent);
        path_release(&parent_nd);
 out2:
-       up(&old_nd.dentry->d_inode->i_sem);
+       mutex_unlock(&old_nd.dentry->d_inode->i_mutex);
        up_write(&namespace_sem);
        path_release(&user_nd);
        path_release(&old_nd);