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UPSTREAM: ANDROID: fuse-bpf: Partial fix for mmap'd files

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This will simply pass all mapping operations to the backing file if it
exists. This is sufficient for our needs in Android13, but must be
extended in the future.

Signed-off-by: Paul Lawrence <paullawrence@google.com>
Bug: 202785178
Test: fuse_test passes
Change-Id: I3c51ef62415633ff0db039f25bfed1adf14e1e80
This commit is contained in:
Paul Lawrence 2021-12-16 18:16:18 +00:00 • committed by Alexander Martinz
commit 595da2719e
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3 changed files with 46 additions and 0 deletions
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38
fs/fuse/backing.c
View file

@ -750,6 +750,44 @@ void *fuse_file_write_iter_finalize(struct fuse_args *fa,
return ERR_PTR(fwo->size);
}
ssize_t fuse_backing_mmap(struct file *file, struct vm_area_struct *vma)
{
int ret;
struct fuse_file *ff = file->private_data;
struct inode *fuse_inode = file_inode(file);
struct file *backing_file = ff->backing_file;
struct inode *backing_inode = file_inode(backing_file);
if (!backing_file->f_op->mmap)
return -ENODEV;
if (WARN_ON(file != vma->vm_file))
return -EIO;
vma->vm_file = get_file(backing_file);
ret = call_mmap(vma->vm_file, vma);
if (ret)
fput(backing_file);
else
fput(file);
if (file->f_flags & O_NOATIME)
return ret;
if ((!timespec64_equal(&fuse_inode->i_mtime,
&backing_inode->i_mtime) ||
!timespec64_equal(&fuse_inode->i_ctime,
&backing_inode->i_ctime))) {
fuse_inode->i_mtime = backing_inode->i_mtime;
fuse_inode->i_ctime = backing_inode->i_ctime;
}
touch_atime(&file->f_path);
return ret;
}
int fuse_file_fallocate_initialize(struct fuse_args *fa,
struct fuse_fallocate_in *ffi,
struct file *file, int mode, loff_t offset, loff_t length)

6
fs/fuse/file.c
View file

@ -2525,6 +2525,12 @@ 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);
#ifdef CONFIG_FUSE_BPF
/* TODO - this is simply passthrough, not a proper BPF filter */
if (ff->backing_file)
return fuse_backing_mmap(file, vma);
#endif
if (ff->passthrough.filp)
return fuse_passthrough_mmap(file, vma);

2
fs/fuse/fuse_i.h
View file

@ -1495,6 +1495,8 @@ int fuse_file_write_iter_backing(struct fuse_args *fa,
void *fuse_file_write_iter_finalize(struct fuse_args *fa,
struct kiocb *iocb, struct iov_iter *from);
ssize_t fuse_backing_mmap(struct file *file, struct vm_area_struct *vma);
int fuse_file_fallocate_initialize(struct fuse_args *fa,
struct fuse_fallocate_in *ffi,
struct file *file, int mode, loff_t offset, loff_t length);