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Mon, 21 Nov 2022 18:16:35 -0800 (PST) Date: Mon, 21 Nov 2022 18:15:33 -0800 In-Reply-To: <20221122021536.1629178-1-drosen@google.com> Mime-Version: 1.0 References: <20221122021536.1629178-1-drosen@google.com> X-Mailer: git-send-email 2.38.1.584.g0f3c55d4c2-goog Message-ID: <20221122021536.1629178-19-drosen@google.com> Subject: [RFC PATCH v2 18/21] fuse-bpf: Add support for FUSE_COPY_FILE_RANGE From: Daniel Rosenberg To: Miklos Szeredi Cc: Amir Goldstein , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-unionfs@vger.kernel.org, bpf@vger.kernel.org, kernel-team@android.com, Daniel Rosenberg , Paul Lawrence Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-State: RFC Signed-off-by: Daniel Rosenberg Signed-off-by: Paul Lawrence --- fs/fuse/backing.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++ fs/fuse/file.c | 4 +++ fs/fuse/fuse_i.h | 10 ++++++ 3 files changed, 99 insertions(+) diff --git a/fs/fuse/backing.c b/fs/fuse/backing.c index e2fe8c3aac2d..36c8688c4463 100644 --- a/fs/fuse/backing.c +++ b/fs/fuse/backing.c @@ -792,6 +792,91 @@ int fuse_bpf_lseek(loff_t *out, struct inode *inode, struct file *file, loff_t o file, offset, whence); } +struct fuse_copy_file_range_io { + struct fuse_copy_file_range_in fci; + struct fuse_write_out fwo; +}; + +static int fuse_copy_file_range_initialize_in(struct fuse_args *fa, + struct fuse_copy_file_range_io *fcf, + 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; + + fcf->fci = (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 fuse_args) { + .nodeid = get_node_id(file_in->f_inode), + .opcode = FUSE_COPY_FILE_RANGE, + .in_numargs = 1, + .in_args[0].size = sizeof(fcf->fci), + .in_args[0].value = &fcf->fci, + }; + + return 0; +} + +static int fuse_copy_file_range_initialize_out(struct fuse_args *fa, + struct fuse_copy_file_range_io *fcf, + 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(fcf->fwo); + fa->out_args[0].value = &fcf->fwo; + + return 0; +} + +static int fuse_copy_file_range_backing(struct 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 = generic_copy_file_range(file_in, pos_in, file_out, pos_out, len, + flags); + return 0; +} + +static int fuse_copy_file_range_finalize(struct 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 fuse_bpf_backing(inode, struct fuse_copy_file_range_io, 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 fuse_args *fa, struct fuse_fsync_in *ffi, struct file *file, loff_t start, loff_t end, int datasync) { diff --git a/fs/fuse/file.c b/fs/fuse/file.c index fa9ee2740a42..8153e78ff1d6 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -3127,6 +3127,10 @@ 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 8ecaf55e4632..275b649bb5ed 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -1416,6 +1416,9 @@ int fuse_bpf_release(int *out, struct inode *inode, struct file *file); int fuse_bpf_releasedir(int *out, struct inode *inode, struct file *file); 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); @@ -1495,6 +1498,13 @@ 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;