From: Daniel Rosenberg <drosen@google.com>
To: Miklos Szeredi <miklos@szeredi.hu>,
bpf@vger.kernel.org, Alexei Starovoitov <ast@kernel.org>
Cc: Amir Goldstein <amir73il@gmail.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-unionfs@vger.kernel.org,
Daniel Borkmann <daniel@iogearbox.net>,
John Fastabend <john.fastabend@gmail.com>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Song Liu <song@kernel.org>, Yonghong Song <yhs@fb.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>, Shuah Khan <shuah@kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
Joanne Koong <joannelkoong@gmail.com>,
Mykola Lysenko <mykolal@fb.com>,
kernel-team@android.com, Daniel Rosenberg <drosen@google.com>,
Paul Lawrence <paullawrence@google.com>
Subject: [RFC PATCH v3 13/37] fuse-bpf: Add lseek support
Date: Mon, 17 Apr 2023 18:40:13 -0700 [thread overview]
Message-ID: <20230418014037.2412394-14-drosen@google.com> (raw)
In-Reply-To: <20230418014037.2412394-1-drosen@google.com>
This adds backing support for FUSE_LSEEK
Signed-off-by: Daniel Rosenberg <drosen@google.com>
Signed-off-by: Paul Lawrence <paullawrence@google.com>
---
fs/fuse/backing.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++
fs/fuse/file.c | 3 ++
fs/fuse/fuse_i.h | 6 ++++
3 files changed, 98 insertions(+)
diff --git a/fs/fuse/backing.c b/fs/fuse/backing.c
index 930aa370e376..c4916dde48c8 100644
--- a/fs/fuse/backing.c
+++ b/fs/fuse/backing.c
@@ -207,6 +207,95 @@ static void fuse_stat_to_attr(struct fuse_conn *fc, struct inode *inode,
attr->blksize = 1 << blkbits;
}
+struct fuse_lseek_args {
+ struct fuse_lseek_in in;
+ struct fuse_lseek_out out;
+};
+
+static int fuse_lseek_initialize_in(struct bpf_fuse_args *fa, struct fuse_lseek_args *args,
+ struct file *file, loff_t offset, int whence)
+{
+ struct fuse_file *fuse_file = file->private_data;
+
+ args->in = (struct fuse_lseek_in) {
+ .fh = fuse_file->fh,
+ .offset = offset,
+ .whence = whence,
+ };
+
+ *fa = (struct bpf_fuse_args) {
+ .info = (struct bpf_fuse_meta_info) {
+ .nodeid = get_node_id(file->f_inode),
+ .opcode = FUSE_LSEEK,
+ },
+ .in_numargs = 1,
+ .in_args[0].size = sizeof(args->in),
+ .in_args[0].value = &args->in,
+ };
+
+ return 0;
+}
+
+static int fuse_lseek_initialize_out(struct bpf_fuse_args *fa, struct fuse_lseek_args *args,
+ struct file *file, loff_t offset, int whence)
+{
+ fa->out_numargs = 1;
+ fa->out_args[0].size = sizeof(args->out);
+ fa->out_args[0].value = &args->out;
+
+ return 0;
+}
+
+static int fuse_lseek_backing(struct bpf_fuse_args *fa, loff_t *out,
+ struct file *file, loff_t offset, int whence)
+{
+ const struct fuse_lseek_in *fli = fa->in_args[0].value;
+ struct fuse_lseek_out *flo = fa->out_args[0].value;
+ struct fuse_file *fuse_file = file->private_data;
+ struct file *backing_file = fuse_file->backing_file;
+
+ /* TODO: Handle changing of the file handle */
+ if (offset == 0) {
+ if (whence == SEEK_CUR) {
+ flo->offset = file->f_pos;
+ *out = flo->offset;
+ return 0;
+ }
+
+ if (whence == SEEK_SET) {
+ flo->offset = vfs_setpos(file, 0, 0);
+ *out = flo->offset;
+ return 0;
+ }
+ }
+
+ inode_lock(file->f_inode);
+ backing_file->f_pos = file->f_pos;
+ *out = vfs_llseek(backing_file, fli->offset, fli->whence);
+ flo->offset = *out;
+ inode_unlock(file->f_inode);
+ return 0;
+}
+
+static int fuse_lseek_finalize(struct bpf_fuse_args *fa, loff_t *out,
+ struct file *file, loff_t offset, int whence)
+{
+ struct fuse_lseek_out *flo = fa->out_args[0].value;
+
+ if (!fa->info.error_in)
+ file->f_pos = flo->offset;
+ *out = flo->offset;
+ return 0;
+}
+
+int fuse_bpf_lseek(loff_t *out, struct inode *inode, struct file *file, loff_t offset, int whence)
+{
+ return bpf_fuse_backing(inode, struct fuse_lseek_args, out,
+ fuse_lseek_initialize_in, fuse_lseek_initialize_out,
+ fuse_lseek_backing, fuse_lseek_finalize,
+ file, offset, whence);
+}
+
ssize_t fuse_backing_mmap(struct file *file, struct vm_area_struct *vma)
{
int ret;
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 865167a80d35..9758bd1665a6 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2779,6 +2779,9 @@ static loff_t fuse_file_llseek(struct file *file, loff_t offset, int whence)
loff_t retval;
struct inode *inode = file_inode(file);
+ if (fuse_bpf_lseek(&retval, inode, file, offset, whence))
+ return retval;
+
switch (whence) {
case SEEK_SET:
case SEEK_CUR:
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 5eb357f482dc..624d0cebd287 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -1405,11 +1405,17 @@ int parse_fuse_bpf_entry(struct fuse_bpf_entry *fbe, int num_entries);
#ifdef CONFIG_FUSE_BPF
+int fuse_bpf_lseek(loff_t *out, struct inode *inode, struct file *file, loff_t offset, int whence);
int fuse_bpf_lookup(struct dentry **out, struct inode *dir, struct dentry *entry, unsigned int flags);
int fuse_bpf_access(int *out, struct inode *inode, int mask);
#else
+static inline int fuse_bpf_lseek(loff_t *out, struct inode *inode, struct file *file, loff_t offset, int whence)
+{
+ return 0;
+}
+
static inline int fuse_bpf_lookup(struct dentry **out, struct inode *dir, struct dentry *entry, unsigned int flags)
{
return 0;
--
2.40.0.634.g4ca3ef3211-goog
next prev parent reply other threads:[~2023-04-18 1:42 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-18 1:40 [RFC PATCH bpf-next v3 00/37] FUSE BPF: A Stacked Filesystem Extension for FUSE Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 01/37] bpf: verifier: Accept dynptr mem as mem in herlpers Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 02/37] bpf: Allow NULL buffers in bpf_dynptr_slice(_rw) Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 03/37] selftests/bpf: Test allowing NULL buffer in dynptr slice Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 04/37] fs: Generic function to convert iocb to rw flags Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 05/37] fuse-bpf: Update fuse side uapi Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 06/37] fuse-bpf: Add data structures for fuse-bpf Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 07/37] fuse-bpf: Prepare for fuse-bpf patch Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 08/37] fuse: Add fuse-bpf, a stacked fs extension for FUSE Daniel Rosenberg
2023-05-02 3:38 ` Alexei Starovoitov
2023-05-03 3:45 ` Amir Goldstein
2023-04-18 1:40 ` [RFC PATCH v3 09/37] fuse-bpf: Add ioctl interface for /dev/fuse Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 10/37] fuse-bpf: Don't support export_operations Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 11/37] fuse-bpf: Add support for access Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 12/37] fuse-bpf: Partially add mapping support Daniel Rosenberg
2023-04-18 1:40 ` Daniel Rosenberg [this message]
2023-04-18 1:40 ` [RFC PATCH v3 14/37] fuse-bpf: Add support for fallocate Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 15/37] fuse-bpf: Support file/dir open/close Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 16/37] fuse-bpf: Support mknod/unlink/mkdir/rmdir Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 17/37] fuse-bpf: Add support for read/write iter Daniel Rosenberg
2023-05-16 20:21 ` Amir Goldstein
2023-04-18 1:40 ` [RFC PATCH v3 18/37] fuse-bpf: support readdir Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 19/37] fuse-bpf: Add support for sync operations Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 20/37] fuse-bpf: Add Rename support Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 21/37] fuse-bpf: Add attr support Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 22/37] fuse-bpf: Add support for FUSE_COPY_FILE_RANGE Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 23/37] fuse-bpf: Add xattr support Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 24/37] fuse-bpf: Add symlink/link support Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 25/37] fuse-bpf: allow mounting with no userspace daemon Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 26/37] bpf: Increase struct_op limits Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 27/37] fuse-bpf: Add fuse-bpf constants Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 28/37] WIP: bpf: Add fuse_ops struct_op programs Daniel Rosenberg
2023-04-27 4:18 ` Andrii Nakryiko
2023-05-03 1:53 ` Daniel Rosenberg
2023-05-03 18:22 ` Andrii Nakryiko
2023-04-18 1:40 ` [RFC PATCH v3 29/37] fuse-bpf: Export Functions Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 30/37] fuse: Provide registration functions for fuse-bpf Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 31/37] fuse-bpf: Set fuse_ops at mount or lookup time Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 32/37] fuse-bpf: Call bpf for pre/post filters Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 33/37] fuse-bpf: Add userspace " Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 34/37] WIP: fuse-bpf: add error_out Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 35/37] tools: Add FUSE, update bpf includes Daniel Rosenberg
2023-04-27 4:24 ` Andrii Nakryiko
2023-04-28 0:48 ` Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 36/37] fuse-bpf: Add selftests Daniel Rosenberg
2023-04-18 1:40 ` [RFC PATCH v3 37/37] fuse: Provide easy way to test fuse struct_op call Daniel Rosenberg
2023-04-18 5:33 ` [RFC PATCH bpf-next v3 00/37] FUSE BPF: A Stacked Filesystem Extension for FUSE Amir Goldstein
2023-04-21 1:41 ` Daniel Rosenberg
2023-04-23 14:50 ` Amir Goldstein
2023-04-24 15:32 ` Miklos Szeredi
2023-05-02 0:07 ` Daniel Rosenberg
2023-05-17 2:50 ` Gao Xiang
2023-05-17 6:51 ` Amir Goldstein
2023-05-17 7:05 ` Gao Xiang
2023-05-17 7:19 ` Gao Xiang
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