@@ -2499,6 +2499,9 @@ static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)
if (FUSE_IS_DAX(file_inode(file)))
return fuse_dax_mmap(file, vma);
+ if (fuse_file_passthrough(ff))
+ return fuse_passthrough_mmap(file, vma);
+
if (ff->open_flags & FOPEN_DIRECT_IO) {
/* Can't provide the coherency needed for MAP_SHARED
* if FUSE_DIRECT_IO_RELAX isn't set.
@@ -1403,5 +1403,6 @@ ssize_t fuse_passthrough_splice_read(struct file *in, loff_t *ppos,
ssize_t fuse_passthrough_splice_write(struct pipe_inode_info *pipe,
struct file *out, loff_t *ppos,
size_t len, unsigned int flags);
+ssize_t fuse_passthrough_mmap(struct file *file, struct vm_area_struct *vma);
#endif /* _FS_FUSE_I_H */
@@ -148,6 +148,22 @@ ssize_t fuse_passthrough_splice_write(struct pipe_inode_info *pipe,
return ret;
}
+ssize_t fuse_passthrough_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct fuse_file *ff = file->private_data;
+ struct file *backing_file = fuse_file_passthrough(ff);
+ struct backing_file_ctx ctx = {
+ .cred = ff->cred,
+ .user_file = file,
+ .accessed = fuse_file_accessed,
+ };
+
+ pr_debug("%s: backing_file=0x%p, start=%lu, end=%lu\n", __func__,
+ backing_file, vma->vm_start, vma->vm_end);
+
+ return backing_file_mmap(backing_file, vma, &ctx);
+}
+
struct fuse_backing *fuse_backing_get(struct fuse_backing *fb)
{
if (fb && refcount_inc_not_zero(&fb->count))