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Message-ID: <20240329015351.624249-19-drosen@google.com>
Date: Thu, 28 Mar 2024 18:53:33 -0700
From: Daniel Rosenberg <drosen@...gle.com>
To: Miklos Szeredi <miklos@...redi.hu>, bpf@...r.kernel.org,
Alexei Starovoitov <ast@...nel.org>
Cc: Amir Goldstein <amir73il@...il.com>, linux-kernel@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-unionfs@...r.kernel.org,
Daniel Borkmann <daniel@...earbox.net>, John Fastabend <john.fastabend@...il.com>,
Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu <song@...nel.org>,
Eduard Zingerman <eddyz87@...il.com>, Yonghong Song <yonghong.song@...ux.dev>,
KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>,
Jiri Olsa <jolsa@...nel.org>, Shuah Khan <shuah@...nel.org>, Jonathan Corbet <corbet@....net>,
Joanne Koong <joannelkoong@...il.com>, Mykola Lysenko <mykolal@...com>,
Christian Brauner <brauner@...nel.org>, kernel-team@...roid.com,
Daniel Rosenberg <drosen@...gle.com>, Paul Lawrence <paullawrence@...gle.com>
Subject: [RFC PATCH v4 18/36] fuse-bpf: Add support for FUSE_COPY_FILE_RANGE
This adds backing support for FUSE_COPY_FILE_RANGE
Signed-off-by: Daniel Rosenberg <drosen@...gle.com>
Signed-off-by: Paul Lawrence <paullawrence@...gle.com>
---
fs/fuse/backing.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++
fs/fuse/file.c | 4 +++
fs/fuse/fuse_i.h | 10 ++++++
3 files changed, 101 insertions(+)
diff --git a/fs/fuse/backing.c b/fs/fuse/backing.c
index e426268aa4e6..2363f392e915 100644
--- a/fs/fuse/backing.c
+++ b/fs/fuse/backing.c
@@ -11,6 +11,7 @@
#include <linux/file.h>
#include <linux/fs_stack.h>
#include <linux/namei.h>
+#include <linux/splice.h>
#include <linux/uio.h>
/*
@@ -778,6 +779,92 @@ int fuse_bpf_lseek(loff_t *out, struct inode *inode, struct file *file, loff_t o
file, offset, whence);
}
+struct fuse_copy_file_range_args {
+ struct fuse_copy_file_range_in in;
+ struct fuse_write_out out;
+};
+
+static int fuse_copy_file_range_initialize_in(struct bpf_fuse_args *fa,
+ struct fuse_copy_file_range_args *args,
+ struct file *file_in, loff_t pos_in, struct file *file_out,
+ loff_t pos_out, size_t len, unsigned int flags)
+{
+ struct fuse_file *fuse_file_in = file_in->private_data;
+ struct fuse_file *fuse_file_out = file_out->private_data;
+
+ args->in = (struct fuse_copy_file_range_in) {
+ .fh_in = fuse_file_in->fh,
+ .off_in = pos_in,
+ .nodeid_out = fuse_file_out->nodeid,
+ .fh_out = fuse_file_out->fh,
+ .off_out = pos_out,
+ .len = len,
+ .flags = flags,
+ };
+
+ *fa = (struct bpf_fuse_args) {
+ .info = (struct bpf_fuse_meta_info) {
+ .nodeid = get_node_id(file_in->f_inode),
+ .opcode = FUSE_COPY_FILE_RANGE,
+ },
+ .in_numargs = 1,
+ .in_args[0].size = sizeof(args->in),
+ .in_args[0].value = &args->in,
+ };
+
+ return 0;
+}
+
+static int fuse_copy_file_range_initialize_out(struct bpf_fuse_args *fa,
+ struct fuse_copy_file_range_args *args,
+ struct file *file_in, loff_t pos_in, struct file *file_out,
+ loff_t pos_out, size_t len, unsigned int flags)
+{
+ fa->out_numargs = 1;
+ fa->out_args[0].size = sizeof(args->out);
+ fa->out_args[0].value = &args->out;
+
+ return 0;
+}
+
+static int fuse_copy_file_range_backing(struct bpf_fuse_args *fa, ssize_t *out, struct file *file_in,
+ loff_t pos_in, struct file *file_out, loff_t pos_out, size_t len,
+ unsigned int flags)
+{
+ const struct fuse_copy_file_range_in *fci = fa->in_args[0].value;
+ struct fuse_file *fuse_file_in = file_in->private_data;
+ struct file *backing_file_in = fuse_file_in->backing_file;
+ struct fuse_file *fuse_file_out = file_out->private_data;
+ struct file *backing_file_out = fuse_file_out->backing_file;
+
+ /* TODO: Handle changing of in/out files */
+ if (backing_file_out)
+ *out = vfs_copy_file_range(backing_file_in, fci->off_in, backing_file_out,
+ fci->off_out, fci->len, fci->flags);
+ else
+ *out = splice_copy_file_range(file_in, pos_in, file_out, pos_out, len);
+ return 0;
+}
+
+static int fuse_copy_file_range_finalize(struct bpf_fuse_args *fa, ssize_t *out, struct file *file_in,
+ loff_t pos_in, struct file *file_out, loff_t pos_out, size_t len,
+ unsigned int flags)
+{
+ return 0;
+}
+
+int fuse_bpf_copy_file_range(ssize_t *out, struct inode *inode, struct file *file_in,
+ loff_t pos_in, struct file *file_out, loff_t pos_out, size_t len,
+ unsigned int flags)
+{
+ return bpf_fuse_backing(inode, struct fuse_copy_file_range_args, out,
+ fuse_copy_file_range_initialize_in,
+ fuse_copy_file_range_initialize_out,
+ fuse_copy_file_range_backing,
+ fuse_copy_file_range_finalize,
+ file_in, pos_in, file_out, pos_out, len, flags);
+}
+
static int fuse_fsync_initialize_in(struct bpf_fuse_args *fa, struct fuse_fsync_in *in,
struct file *file, loff_t start, loff_t end, int datasync)
{
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 5983faf59c1f..46de67810f03 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -3168,6 +3168,10 @@ static ssize_t __fuse_copy_file_range(struct file *file_in, loff_t pos_in,
bool is_unstable = (!fc->writeback_cache) &&
((pos_out + len) > inode_out->i_size);
+ if (fuse_bpf_copy_file_range(&err, file_inode(file_in), file_in, pos_in,
+ file_out, pos_out, len, flags))
+ return err;
+
if (fc->no_copy_file_range)
return -EOPNOTSUPP;
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 61a17071ab02..a95d543c79ae 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -1454,6 +1454,9 @@ int fuse_bpf_release(int *out, struct inode *inode, struct fuse_file *ff);
int fuse_bpf_releasedir(int *out, struct inode *inode, struct fuse_file *ff);
int fuse_bpf_flush(int *out, struct inode *inode, struct file *file, fl_owner_t id);
int fuse_bpf_lseek(loff_t *out, struct inode *inode, struct file *file, loff_t offset, int whence);
+int fuse_bpf_copy_file_range(ssize_t *out, struct inode *inode, struct file *file_in, loff_t pos_in,
+ struct file *file_out, loff_t pos_out,
+ size_t len, unsigned int flags);
int fuse_bpf_fsync(int *out, struct inode *inode, struct file *file, loff_t start, loff_t end, int datasync);
int fuse_bpf_dir_fsync(int *out, struct inode *inode, struct file *file, loff_t start, loff_t end, int datasync);
int fuse_bpf_file_read_iter(ssize_t *out, struct inode *inode, struct kiocb *iocb, struct iov_iter *to);
@@ -1533,6 +1536,13 @@ static inline int fuse_bpf_lseek(loff_t *out, struct inode *inode, struct file *
return 0;
}
+static inline int fuse_bpf_copy_file_range(ssize_t *out, struct inode *inode, struct file *file_in, loff_t pos_in,
+ struct file *file_out, loff_t pos_out,
+ size_t len, unsigned int flags)
+{
+ return 0;
+}
+
static inline int fuse_bpf_fsync(int *out, struct inode *inode, struct file *file, loff_t start, loff_t end, int datasync)
{
return 0;
--
2.44.0.478.gd926399ef9-goog
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