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dcache: extrace and use d_unlinked()

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d_unlinked() will be used in middle-term to ban checkpointing when opened
but unlinked file is detected, and in long term, to detect such situation
and special case on it.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Alexey Dobriyan
2009-05-04 03:32:03 +04:00
committed by Al Viro
parent 8c85e12512
commit f3da392e9f
3 changed files with 12 additions and 8 deletions
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8
fs/namespace.c
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@@ -1384,7 +1384,7 @@ static int graft_tree(struct vfsmount *mnt, struct path *path)
goto out_unlock;
err = -ENOENT;
if (IS_ROOT(path->dentry) || !d_unhashed(path->dentry))
if (!d_unlinked(path->dentry))
err = attach_recursive_mnt(mnt, path, NULL);
out_unlock:
mutex_unlock(&path->dentry->d_inode->i_mutex);
@@ -1566,7 +1566,7 @@ static int do_move_mount(struct path *path, char *old_name)
if (IS_DEADDIR(path->dentry->d_inode))
goto out1;
if (!IS_ROOT(path->dentry) && d_unhashed(path->dentry))
if (d_unlinked(path->dentry))
goto out1;
err = -EINVAL;
@@ -2129,9 +2129,9 @@ SYSCALL_DEFINE2(pivot_root, const char __user *, new_root,
error = -ENOENT;
if (IS_DEADDIR(new.dentry->d_inode))
goto out2;
if (d_unhashed(new.dentry) && !IS_ROOT(new.dentry))
if (d_unlinked(new.dentry))
goto out2;
if (d_unhashed(old.dentry) && !IS_ROOT(old.dentry))
if (d_unlinked(old.dentry))
goto out2;
error = -EBUSY;
if (new.mnt == root.mnt ||