Signed-off-by: Daniel Rosenberg <drosen@xxxxxxxxxx> Signed-off-by: Paul Lawrence <paullawrence@xxxxxxxxxx> --- fs/fuse/backing.c | 210 ++++++++++++++++++++++++++++++++++++++++++++++ fs/fuse/dir.c | 7 ++ fs/fuse/fuse_i.h | 18 ++++ 3 files changed, 235 insertions(+) diff --git a/fs/fuse/backing.c b/fs/fuse/backing.c index 719292e03b18..333181d6ad73 100644 --- a/fs/fuse/backing.c +++ b/fs/fuse/backing.c @@ -1677,6 +1677,216 @@ 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_userns = &init_user_ns, + .old_dir = d_inode(old_backing_dir_dentry), + .old_dentry = old_backing_dentry, + .new_mnt_userns = &init_user_ns, + .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; +} + +static int fuse_rename2_initialize_in(struct fuse_args *fa, struct fuse_rename2_in *fri, + struct inode *olddir, struct dentry *oldent, + struct inode *newdir, struct dentry *newent, + unsigned int flags) +{ + *fri = (struct fuse_rename2_in) { + .newdir = get_node_id(newdir), + .flags = flags, + }; + *fa = (struct fuse_args) { + .nodeid = get_node_id(olddir), + .opcode = FUSE_RENAME2, + .in_numargs = 3, + .in_args[0] = (struct fuse_in_arg) { + .size = sizeof(*fri), + .value = fri, + }, + .in_args[1] = (struct fuse_in_arg) { + .size = oldent->d_name.len + 1, + .value = (void *) oldent->d_name.name, + }, + .in_args[2] = (struct fuse_in_arg) { + .size = newent->d_name.len + 1, + .value = (void *) newent->d_name.name, + }, + }; + + return 0; +} + +static int fuse_rename2_initialize_out(struct fuse_args *fa, struct fuse_rename2_in *fri, + struct inode *olddir, struct dentry *oldent, + struct inode *newdir, struct dentry *newent, + unsigned int flags) +{ + return 0; +} + +static int fuse_rename2_backing(struct fuse_args *fa, int *out, + struct inode *olddir, struct dentry *oldent, + struct inode *newdir, struct dentry *newent, + unsigned int flags) +{ + const struct fuse_rename2_in *fri = fa->in_args[0].value; + + /* TODO: deal with changing dirs/ents */ + *out = fuse_rename_backing_common(olddir, oldent, newdir, newent, + fri->flags); + return *out; +} + +static int fuse_rename2_finalize(struct 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 fuse_bpf_backing(olddir, struct fuse_rename2_in, out, + fuse_rename2_initialize_in, + fuse_rename2_initialize_out, fuse_rename2_backing, + fuse_rename2_finalize, + olddir, oldent, newdir, newent, flags); +} + +static int fuse_rename_initialize_in(struct fuse_args *fa, struct fuse_rename_in *fri, + struct inode *olddir, struct dentry *oldent, + struct inode *newdir, struct dentry *newent) +{ + *fri = (struct fuse_rename_in) { + .newdir = get_node_id(newdir), + }; + *fa = (struct fuse_args) { + .nodeid = get_node_id(olddir), + .opcode = FUSE_RENAME, + .in_numargs = 3, + .in_args[0] = (struct fuse_in_arg) { + .size = sizeof(*fri), + .value = fri, + }, + .in_args[1] = (struct fuse_in_arg) { + .size = oldent->d_name.len + 1, + .value = (void *) oldent->d_name.name, + }, + .in_args[2] = (struct fuse_in_arg) { + .size = newent->d_name.len + 1, + .value = (void *) newent->d_name.name, + }, + }; + + return 0; +} + +static int fuse_rename_initialize_out(struct fuse_args *fa, struct fuse_rename_in *fri, + struct inode *olddir, struct dentry *oldent, + struct inode *newdir, struct dentry *newent) +{ + return 0; +} + +static int fuse_rename_backing(struct 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 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 fuse_bpf_backing(olddir, struct fuse_rename_in, 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 fuse_args *fa, struct fuse_unused_io *unused, struct inode *dir, struct dentry *entry) { diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index 55ed3fb9d4a3..6ad0eb92de3b 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -1116,6 +1116,10 @@ static int fuse_rename2(struct user_namespace *mnt_userns, 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; @@ -1127,6 +1131,9 @@ static int fuse_rename2(struct user_namespace *mnt_userns, 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 cb087364e9bb..3338ac84d083 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -1406,6 +1406,11 @@ 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); @@ -1448,6 +1453,19 @@ 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; -- 2.38.1.584.g0f3c55d4c2-goog