[O_TMPFILE] it's still short a few helpers, but infrastructure should be OK now...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/namei.c b/fs/namei.c
index 402eda3..778e253 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2902,6 +2902,61 @@
goto retry_lookup;
}
+static int do_tmpfile(int dfd, struct filename *pathname,
+ struct nameidata *nd, int flags,
+ const struct open_flags *op,
+ struct file *file, int *opened)
+{
+ static const struct qstr name = QSTR_INIT("/", 1);
+ struct dentry *dentry, *child;
+ struct inode *dir;
+ int error = path_lookupat(dfd, pathname->name,
+ flags | LOOKUP_DIRECTORY, nd);
+ if (unlikely(error))
+ return error;
+ error = mnt_want_write(nd->path.mnt);
+ if (unlikely(error))
+ goto out;
+ /* we want directory to be writable */
+ error = inode_permission(nd->inode, MAY_WRITE | MAY_EXEC);
+ if (error)
+ goto out2;
+ dentry = nd->path.dentry;
+ dir = dentry->d_inode;
+ if (!dir->i_op->tmpfile) {
+ error = -EOPNOTSUPP;
+ goto out2;
+ }
+ child = d_alloc(dentry, &name);
+ if (unlikely(!child)) {
+ error = -ENOMEM;
+ goto out2;
+ }
+ nd->flags &= ~LOOKUP_DIRECTORY;
+ nd->flags |= op->intent;
+ dput(nd->path.dentry);
+ nd->path.dentry = child;
+ error = dir->i_op->tmpfile(dir, nd->path.dentry, op->mode);
+ if (error)
+ goto out2;
+ audit_inode(pathname, nd->path.dentry, 0);
+ error = may_open(&nd->path, op->acc_mode, op->open_flag);
+ if (error)
+ goto out2;
+ file->f_path.mnt = nd->path.mnt;
+ error = finish_open(file, nd->path.dentry, NULL, opened);
+ if (error)
+ goto out2;
+ error = open_check_o_direct(file);
+ if (error)
+ fput(file);
+out2:
+ mnt_drop_write(nd->path.mnt);
+out:
+ path_put(&nd->path);
+ return error;
+}
+
static struct file *path_openat(int dfd, struct filename *pathname,
struct nameidata *nd, const struct open_flags *op, int flags)
{
@@ -2917,6 +2972,11 @@
file->f_flags = op->open_flag;
+ if (unlikely(file->f_flags & O_TMPFILE)) {
+ error = do_tmpfile(dfd, pathname, nd, flags, op, file, &opened);
+ goto out;
+ }
+
error = path_init(dfd, pathname->name, flags | LOOKUP_PARENT, nd, &base);
if (unlikely(error))
goto out;