Commit 2f502839 authored by Miklos Szeredi's avatar Miklos Szeredi

ovl: add ovl_mmap()

Implement stacked mmap.
Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent de30dfd6
...@@ -255,6 +255,37 @@ static int ovl_fsync(struct file *file, loff_t start, loff_t end, int datasync) ...@@ -255,6 +255,37 @@ static int ovl_fsync(struct file *file, loff_t start, loff_t end, int datasync)
return ret; return ret;
} }
static int ovl_mmap(struct file *file, struct vm_area_struct *vma)
{
struct file *realfile = file->private_data;
const struct cred *old_cred;
int ret;
if (!realfile->f_op->mmap)
return -ENODEV;
if (WARN_ON(file != vma->vm_file))
return -EIO;
vma->vm_file = get_file(realfile);
old_cred = ovl_override_creds(file_inode(file)->i_sb);
ret = call_mmap(vma->vm_file, vma);
revert_creds(old_cred);
if (ret) {
/* Drop reference count from new vm_file value */
fput(realfile);
} else {
/* Drop reference count from previous vm_file value */
fput(file);
}
ovl_file_accessed(file);
return ret;
}
const struct file_operations ovl_file_operations = { const struct file_operations ovl_file_operations = {
.open = ovl_open, .open = ovl_open,
.release = ovl_release, .release = ovl_release,
...@@ -262,4 +293,5 @@ const struct file_operations ovl_file_operations = { ...@@ -262,4 +293,5 @@ const struct file_operations ovl_file_operations = {
.read_iter = ovl_read_iter, .read_iter = ovl_read_iter,
.write_iter = ovl_write_iter, .write_iter = ovl_write_iter,
.fsync = ovl_fsync, .fsync = ovl_fsync,
.mmap = ovl_mmap,
}; };
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