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author | Anton Altaparmakov <aia21@cantab.net> | 2006-02-24 09:06:36 +0000 |
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committer | Anton Altaparmakov <aia21@cantab.net> | 2006-02-24 09:06:36 +0000 |
commit | fab8d6ddf6dee2608869005d45fe97f70e4f5bdd (patch) | |
tree | fecf566e03a87b2a44c7f3363ddb5c0d4bebdca7 /fs/namespace.c | |
parent | 64419d93a5906600af5817ad0cae3c6ecf7fb389 (diff) | |
parent | f52ee1410d563cd409b08822492273a5bc235821 (diff) | |
download | op-kernel-dev-fab8d6ddf6dee2608869005d45fe97f70e4f5bdd.zip op-kernel-dev-fab8d6ddf6dee2608869005d45fe97f70e4f5bdd.tar.gz |
Merge branch 'master' of /home/src/linux-2.6/
Diffstat (limited to 'fs/namespace.c')
-rw-r--r-- | fs/namespace.c | 58 |
1 files changed, 37 insertions, 21 deletions
diff --git a/fs/namespace.c b/fs/namespace.c index ce97bec..058a448 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -494,7 +494,7 @@ void umount_tree(struct vfsmount *mnt, int propagate, struct list_head *kill) p->mnt_namespace = NULL; list_del_init(&p->mnt_child); if (p->mnt_parent != p) - mnt->mnt_mountpoint->d_mounted--; + p->mnt_mountpoint->d_mounted--; change_mnt_propagation(p, MS_PRIVATE); } } @@ -1325,27 +1325,17 @@ dput_out: return retval; } -int copy_namespace(int flags, struct task_struct *tsk) +/* + * Allocate a new namespace structure and populate it with contents + * copied from the namespace of the passed in task structure. + */ +struct namespace *dup_namespace(struct task_struct *tsk, struct fs_struct *fs) { struct namespace *namespace = tsk->namespace; struct namespace *new_ns; struct vfsmount *rootmnt = NULL, *pwdmnt = NULL, *altrootmnt = NULL; - struct fs_struct *fs = tsk->fs; struct vfsmount *p, *q; - if (!namespace) - return 0; - - get_namespace(namespace); - - if (!(flags & CLONE_NEWNS)) - return 0; - - if (!capable(CAP_SYS_ADMIN)) { - put_namespace(namespace); - return -EPERM; - } - new_ns = kmalloc(sizeof(struct namespace), GFP_KERNEL); if (!new_ns) goto out; @@ -1396,8 +1386,6 @@ int copy_namespace(int flags, struct task_struct *tsk) } up_write(&namespace_sem); - tsk->namespace = new_ns; - if (rootmnt) mntput(rootmnt); if (pwdmnt) @@ -1405,12 +1393,40 @@ int copy_namespace(int flags, struct task_struct *tsk) if (altrootmnt) mntput(altrootmnt); - put_namespace(namespace); - return 0; +out: + return new_ns; +} + +int copy_namespace(int flags, struct task_struct *tsk) +{ + struct namespace *namespace = tsk->namespace; + struct namespace *new_ns; + int err = 0; + + if (!namespace) + return 0; + + get_namespace(namespace); + + if (!(flags & CLONE_NEWNS)) + return 0; + + if (!capable(CAP_SYS_ADMIN)) { + err = -EPERM; + goto out; + } + + new_ns = dup_namespace(tsk, tsk->fs); + if (!new_ns) { + err = -ENOMEM; + goto out; + } + + tsk->namespace = new_ns; out: put_namespace(namespace); - return -ENOMEM; + return err; } asmlinkage long sys_mount(char __user * dev_name, char __user * dir_name, |