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 20/37] fuse-bpf: Add Rename support
Date: Mon, 17 Apr 2023 18:40:20 -0700 [thread overview]
Message-ID: <20230418014037.2412394-21-drosen@google.com> (raw)
In-Reply-To: <20230418014037.2412394-1-drosen@google.com>
This adds backing support for FUSE_RENAME and FUSE_RENAME2
Signed-off-by: Daniel Rosenberg <drosen@google.com>
Signed-off-by: Paul Lawrence <paullawrence@google.com>
---
fs/fuse/backing.c | 250 ++++++++++++++++++++++++++++++++++++++++++++++
fs/fuse/dir.c | 7 ++
fs/fuse/fuse_i.h | 18 ++++
3 files changed, 275 insertions(+)
diff --git a/fs/fuse/backing.c b/fs/fuse/backing.c
index 30492f7b2a05..d3a706b55905 100644
--- a/fs/fuse/backing.c
+++ b/fs/fuse/backing.c
@@ -1747,6 +1747,256 @@ int fuse_bpf_rmdir(int *out, struct inode *dir, struct dentry *entry)
dir, entry);
}
+static int fuse_rename_backing_common(struct inode *olddir,
+ struct dentry *oldent,
+ struct inode *newdir,
+ struct dentry *newent, unsigned int flags)
+{
+ int err = 0;
+ struct path old_backing_path;
+ struct path new_backing_path;
+ struct dentry *old_backing_dir_dentry;
+ struct dentry *old_backing_dentry;
+ struct dentry *new_backing_dir_dentry;
+ struct dentry *new_backing_dentry;
+ struct dentry *trap = NULL;
+ struct inode *target_inode;
+ struct renamedata rd;
+
+ //TODO Actually deal with changing anything that isn't a flag
+ get_fuse_backing_path(oldent, &old_backing_path);
+ if (!old_backing_path.dentry)
+ return -EBADF;
+ get_fuse_backing_path(newent, &new_backing_path);
+ if (!new_backing_path.dentry) {
+ /*
+ * TODO A file being moved from a backing path to another
+ * backing path which is not yet instrumented with FUSE-BPF.
+ * This may be slow and should be substituted with something
+ * more clever.
+ */
+ err = -EXDEV;
+ goto put_old_path;
+ }
+ if (new_backing_path.mnt != old_backing_path.mnt) {
+ err = -EXDEV;
+ goto put_new_path;
+ }
+ old_backing_dentry = old_backing_path.dentry;
+ new_backing_dentry = new_backing_path.dentry;
+ old_backing_dir_dentry = dget_parent(old_backing_dentry);
+ new_backing_dir_dentry = dget_parent(new_backing_dentry);
+ target_inode = d_inode(newent);
+
+ trap = lock_rename(old_backing_dir_dentry, new_backing_dir_dentry);
+ if (trap == old_backing_dentry) {
+ err = -EINVAL;
+ goto put_parents;
+ }
+ if (trap == new_backing_dentry) {
+ err = -ENOTEMPTY;
+ goto put_parents;
+ }
+
+ rd = (struct renamedata) {
+ .old_mnt_idmap = &nop_mnt_idmap,
+ .old_dir = d_inode(old_backing_dir_dentry),
+ .old_dentry = old_backing_dentry,
+ .new_mnt_idmap = &nop_mnt_idmap,
+ .new_dir = d_inode(new_backing_dir_dentry),
+ .new_dentry = new_backing_dentry,
+ .flags = flags,
+ };
+ err = vfs_rename(&rd);
+ if (err)
+ goto unlock;
+ if (target_inode)
+ fsstack_copy_attr_all(target_inode,
+ get_fuse_inode(target_inode)->backing_inode);
+ fsstack_copy_attr_all(d_inode(oldent), d_inode(old_backing_dentry));
+unlock:
+ unlock_rename(old_backing_dir_dentry, new_backing_dir_dentry);
+put_parents:
+ dput(new_backing_dir_dentry);
+ dput(old_backing_dir_dentry);
+put_new_path:
+ path_put(&new_backing_path);
+put_old_path:
+ path_put(&old_backing_path);
+ return err;
+}
+
+struct fuse_rename2_args {
+ struct fuse_rename2_in in;
+ struct fuse_buffer old_name;
+ struct fuse_buffer new_name;
+};
+
+static int fuse_rename2_initialize_in(struct bpf_fuse_args *fa, struct fuse_rename2_args *args,
+ struct inode *olddir, struct dentry *oldent,
+ struct inode *newdir, struct dentry *newent,
+ unsigned int flags)
+{
+ *args = (struct fuse_rename2_args) {
+ .in = (struct fuse_rename2_in) {
+ .newdir = get_node_id(newdir),
+ .flags = flags,
+ },
+ .old_name = (struct fuse_buffer) {
+ .data = (void *) oldent->d_name.name,
+ .size = oldent->d_name.len + 1,
+ .flags = BPF_FUSE_IMMUTABLE,
+ },
+ .new_name = (struct fuse_buffer) {
+ .data = (void *) newent->d_name.name,
+ .size = newent->d_name.len + 1,
+ .flags = BPF_FUSE_IMMUTABLE,
+ },
+
+ };
+ *fa = (struct bpf_fuse_args) {
+ .info = (struct bpf_fuse_meta_info) {
+ .nodeid = get_node_id(olddir),
+ .opcode = FUSE_RENAME2,
+ },
+ .in_numargs = 3,
+ .in_args[0] = (struct bpf_fuse_arg) {
+ .size = sizeof(args->in),
+ .value = &args->in,
+ },
+ .in_args[1] = (struct bpf_fuse_arg) {
+ .is_buffer = true,
+ .buffer = &args->old_name,
+ },
+ .in_args[2] = (struct bpf_fuse_arg) {
+ .is_buffer = true,
+ .buffer = &args->new_name,
+ },
+ };
+
+ return 0;
+}
+
+static int fuse_rename2_initialize_out(struct bpf_fuse_args *fa, struct fuse_rename2_args *args,
+ struct inode *olddir, struct dentry *oldent,
+ struct inode *newdir, struct dentry *newent,
+ unsigned int flags)
+{
+ return 0;
+}
+
+static int fuse_rename2_backing(struct bpf_fuse_args *fa, int *out,
+ struct inode *olddir, struct dentry *oldent,
+ struct inode *newdir, struct dentry *newent,
+ unsigned int flags)
+{
+ const struct fuse_rename2_args *fri = fa->in_args[0].value;
+
+ /* TODO: deal with changing dirs/ents */
+ *out = fuse_rename_backing_common(olddir, oldent, newdir, newent,
+ fri->in.flags);
+ return *out;
+}
+
+static int fuse_rename2_finalize(struct bpf_fuse_args *fa, int *out,
+ struct inode *olddir, struct dentry *oldent,
+ struct inode *newdir, struct dentry *newent,
+ unsigned int flags)
+{
+ return 0;
+}
+
+int fuse_bpf_rename2(int *out, struct inode *olddir, struct dentry *oldent,
+ struct inode *newdir, struct dentry *newent,
+ unsigned int flags)
+{
+ return bpf_fuse_backing(olddir, struct fuse_rename2_args, out,
+ fuse_rename2_initialize_in, fuse_rename2_initialize_out,
+ fuse_rename2_backing, fuse_rename2_finalize,
+ olddir, oldent, newdir, newent, flags);
+}
+
+struct fuse_rename_args {
+ struct fuse_rename_in in;
+ struct fuse_buffer old_name;
+ struct fuse_buffer new_name;
+};
+
+static int fuse_rename_initialize_in(struct bpf_fuse_args *fa, struct fuse_rename_args *args,
+ struct inode *olddir, struct dentry *oldent,
+ struct inode *newdir, struct dentry *newent)
+{
+ *args = (struct fuse_rename_args) {
+ .in = (struct fuse_rename_in) {
+ .newdir = get_node_id(newdir),
+ },
+ .old_name = (struct fuse_buffer) {
+ .data = (void *) oldent->d_name.name,
+ .size = oldent->d_name.len + 1,
+ .flags = BPF_FUSE_IMMUTABLE,
+ },
+ .new_name = (struct fuse_buffer) {
+ .data = (void *) newent->d_name.name,
+ .size = newent->d_name.len + 1,
+ .flags = BPF_FUSE_IMMUTABLE,
+ },
+
+ };
+ *fa = (struct bpf_fuse_args) {
+ .info = (struct bpf_fuse_meta_info) {
+ .nodeid = get_node_id(olddir),
+ .opcode = FUSE_RENAME,
+ },
+ .in_numargs = 3,
+ .in_args[0] = (struct bpf_fuse_arg) {
+ .size = sizeof(args->in),
+ .value = &args->in,
+ },
+ .in_args[1] = (struct bpf_fuse_arg) {
+ .is_buffer = true,
+ .buffer = &args->old_name,
+ },
+ .in_args[2] = (struct bpf_fuse_arg) {
+ .is_buffer = true,
+ .buffer = &args->new_name,
+ },
+ };
+
+ return 0;
+}
+
+static int fuse_rename_initialize_out(struct bpf_fuse_args *fa, struct fuse_rename_args *args,
+ struct inode *olddir, struct dentry *oldent,
+ struct inode *newdir, struct dentry *newent)
+{
+ return 0;
+}
+
+static int fuse_rename_backing(struct bpf_fuse_args *fa, int *out,
+ struct inode *olddir, struct dentry *oldent,
+ struct inode *newdir, struct dentry *newent)
+{
+ /* TODO: deal with changing dirs/ents */
+ *out = fuse_rename_backing_common(olddir, oldent, newdir, newent, 0);
+ return *out;
+}
+
+static int fuse_rename_finalize(struct bpf_fuse_args *fa, int *out,
+ struct inode *olddir, struct dentry *oldent,
+ struct inode *newdir, struct dentry *newent)
+{
+ return 0;
+}
+
+int fuse_bpf_rename(int *out, struct inode *olddir, struct dentry *oldent,
+ struct inode *newdir, struct dentry *newent)
+{
+ return bpf_fuse_backing(olddir, struct fuse_rename_args, out,
+ fuse_rename_initialize_in, fuse_rename_initialize_out,
+ fuse_rename_backing, fuse_rename_finalize,
+ olddir, oldent, newdir, newent);
+}
+
static int fuse_unlink_initialize_in(struct bpf_fuse_args *fa, struct fuse_buffer *name,
struct inode *dir, struct dentry *entry)
{
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 5ce65f696980..086e3ecada19 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1184,6 +1184,10 @@ static int fuse_rename2(struct mnt_idmap *idmap, struct inode *olddir,
return -EINVAL;
if (flags) {
+ if (fuse_bpf_rename2(&err, olddir, oldent, newdir, newent, flags))
+ return err;
+
+ /* TODO: how should this go with bpfs involved? */
if (fc->no_rename2 || fc->minor < 23)
return -EINVAL;
@@ -1195,6 +1199,9 @@ static int fuse_rename2(struct mnt_idmap *idmap, struct inode *olddir,
err = -EINVAL;
}
} else {
+ if (fuse_bpf_rename(&err, olddir, oldent, newdir, newent))
+ return err;
+
err = fuse_rename_common(olddir, oldent, newdir, newent, 0,
FUSE_RENAME,
sizeof(struct fuse_rename_in));
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index e60207bf66de..5c8bd2f76fb9 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -1411,6 +1411,11 @@ int fuse_bpf_create_open(int *out, struct inode *dir, struct dentry *entry,
int fuse_bpf_mknod(int *out, struct inode *dir, struct dentry *entry, umode_t mode, dev_t rdev);
int fuse_bpf_mkdir(int *out, struct inode *dir, struct dentry *entry, umode_t mode);
int fuse_bpf_rmdir(int *out, struct inode *dir, struct dentry *entry);
+int fuse_bpf_rename2(int *out, struct inode *olddir, struct dentry *oldent,
+ struct inode *newdir, struct dentry *newent,
+ unsigned int flags);
+int fuse_bpf_rename(int *out, struct inode *olddir, struct dentry *oldent,
+ struct inode *newdir, struct dentry *newent);
int fuse_bpf_unlink(int *out, struct inode *dir, struct dentry *entry);
int fuse_bpf_release(int *out, struct inode *inode, struct file *file);
int fuse_bpf_releasedir(int *out, struct inode *inode, struct file *file);
@@ -1453,6 +1458,19 @@ static inline int fuse_bpf_rmdir(int *out, struct inode *dir, struct dentry *ent
return 0;
}
+static inline int fuse_bpf_rename2(int *out, struct inode *olddir, struct dentry *oldent,
+ struct inode *newdir, struct dentry *newent,
+ unsigned int flags)
+{
+ return 0;
+}
+
+static inline int fuse_bpf_rename(int *out, struct inode *olddir, struct dentry *oldent,
+ struct inode *newdir, struct dentry *newent)
+{
+ return 0;
+}
+
static inline int fuse_bpf_unlink(int *out, struct inode *dir, struct dentry *entry)
{
return 0;
--
2.40.0.634.g4ca3ef3211-goog
next prev parent reply other threads:[~2023-04-18 1:43 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 ` [RFC PATCH v3 13/37] fuse-bpf: Add lseek support Daniel Rosenberg
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 ` Daniel Rosenberg [this message]
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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