From: Miklos Szeredi This patch adds the write filesystem operations of FUSE. The following operations are added: o setattr o symlink o mknod o mkdir o create o unlink o rmdir o rename o link Signed-off-by: Miklos Szeredi Signed-off-by: Andrew Morton --- 25-akpm/fs/fuse/dir.c | 356 +++++++++++++++++++++++++++++++++++++++++++ 25-akpm/include/linux/fuse.h | 39 ++++ 2 files changed, 395 insertions(+) diff -puN fs/fuse/dir.c~fuse-read-write-operations fs/fuse/dir.c --- 25/fs/fuse/dir.c~fuse-read-write-operations Wed Jan 12 14:33:31 2005 +++ 25-akpm/fs/fuse/dir.c Wed Jan 12 14:33:31 2005 @@ -120,6 +120,266 @@ static int fuse_lookup_iget(struct inode return 0; } +void fuse_invalidate_attr(struct inode *inode) +{ + get_fuse_inode(inode)->i_time = jiffies - 1; +} + +static void fuse_invalidate_entry(struct dentry *entry) +{ + d_invalidate(entry); + entry->d_time = jiffies - 1; +} + +static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, + struct inode *dir, struct dentry *entry, + int mode) +{ + struct fuse_entry_out outarg; + struct inode *inode; + struct fuse_inode *fi; + int version; + int err; + + req->in.h.nodeid = get_node_id(dir); + req->inode = dir; + req->out.numargs = 1; + req->out.args[0].size = sizeof(outarg); + req->out.args[0].value = &outarg; + request_send(fc, req); + version = req->out.h.unique; + err = req->out.h.error; + if (err) { + fuse_put_request(fc, req); + return err; + } + inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, + &outarg.attr, version); + if (!inode) { + fuse_send_forget(fc, req, outarg.nodeid, version); + return -ENOMEM; + } + fuse_put_request(fc, req); + + /* Don't allow userspace to do really stupid things... */ + if ((inode->i_mode ^ mode) & S_IFMT) { + iput(inode); + return -EIO; + } + + entry->d_time = time_to_jiffies(outarg.entry_valid, + outarg.entry_valid_nsec); + + fi = get_fuse_inode(inode); + fi->i_time = time_to_jiffies(outarg.attr_valid, + outarg.attr_valid_nsec); + + d_instantiate(entry, inode); + fuse_invalidate_attr(dir); + return 0; +} + +static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode, + dev_t rdev) +{ + struct fuse_mknod_in inarg; + struct fuse_conn *fc = get_fuse_conn(dir); + struct fuse_req *req = fuse_get_request(fc); + if (!req) + return -ERESTARTNOINTR; + + memset(&inarg, 0, sizeof(inarg)); + inarg.mode = mode; + inarg.rdev = new_encode_dev(rdev); + req->in.h.opcode = FUSE_MKNOD; + req->in.numargs = 2; + req->in.args[0].size = sizeof(inarg); + req->in.args[0].value = &inarg; + req->in.args[1].size = entry->d_name.len + 1; + req->in.args[1].value = entry->d_name.name; + return create_new_entry(fc, req, dir, entry, mode); +} + +static int fuse_create(struct inode *dir, struct dentry *entry, int mode, + struct nameidata *nd) +{ + return fuse_mknod(dir, entry, mode, 0); +} + +static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode) +{ + struct fuse_mkdir_in inarg; + struct fuse_conn *fc = get_fuse_conn(dir); + struct fuse_req *req = fuse_get_request(fc); + if (!req) + return -ERESTARTNOINTR; + + memset(&inarg, 0, sizeof(inarg)); + inarg.mode = mode; + req->in.h.opcode = FUSE_MKDIR; + req->in.numargs = 2; + req->in.args[0].size = sizeof(inarg); + req->in.args[0].value = &inarg; + req->in.args[1].size = entry->d_name.len + 1; + req->in.args[1].value = entry->d_name.name; + return create_new_entry(fc, req, dir, entry, S_IFDIR); +} + +static int fuse_symlink(struct inode *dir, struct dentry *entry, + const char *link) +{ + struct fuse_conn *fc = get_fuse_conn(dir); + unsigned len = strlen(link) + 1; + struct fuse_req *req; + + if (len > FUSE_SYMLINK_MAX) + return -ENAMETOOLONG; + + req = fuse_get_request(fc); + if (!req) + return -ERESTARTNOINTR; + + req->in.h.opcode = FUSE_SYMLINK; + req->in.numargs = 2; + req->in.args[0].size = entry->d_name.len + 1; + req->in.args[0].value = entry->d_name.name; + req->in.args[1].size = len; + req->in.args[1].value = link; + return create_new_entry(fc, req, dir, entry, S_IFLNK); +} + +static int fuse_unlink(struct inode *dir, struct dentry *entry) +{ + int err; + struct fuse_conn *fc = get_fuse_conn(dir); + struct fuse_req *req = fuse_get_request(fc); + if (!req) + return -ERESTARTNOINTR; + + req->in.h.opcode = FUSE_UNLINK; + req->in.h.nodeid = get_node_id(dir); + req->inode = dir; + req->in.numargs = 1; + req->in.args[0].size = entry->d_name.len + 1; + req->in.args[0].value = entry->d_name.name; + request_send(fc, req); + err = req->out.h.error; + fuse_put_request(fc, req); + if (!err) { + struct inode *inode = entry->d_inode; + + /* Set nlink to zero so the inode can be cleared, if + the inode does have more links this will be + discovered at the next lookup/getattr */ + inode->i_nlink = 0; + fuse_invalidate_attr(inode); + fuse_invalidate_attr(dir); + } else if (err == -EINTR) + fuse_invalidate_entry(entry); + return err; +} + +static int fuse_rmdir(struct inode *dir, struct dentry *entry) +{ + int err; + struct fuse_conn *fc = get_fuse_conn(dir); + struct fuse_req *req = fuse_get_request(fc); + if (!req) + return -ERESTARTNOINTR; + + req->in.h.opcode = FUSE_RMDIR; + req->in.h.nodeid = get_node_id(dir); + req->inode = dir; + req->in.numargs = 1; + req->in.args[0].size = entry->d_name.len + 1; + req->in.args[0].value = entry->d_name.name; + request_send(fc, req); + err = req->out.h.error; + fuse_put_request(fc, req); + if (!err) { + entry->d_inode->i_nlink = 0; + fuse_invalidate_attr(dir); + } else if (err == -EINTR) + fuse_invalidate_entry(entry); + return err; +} + +static int fuse_rename(struct inode *olddir, struct dentry *oldent, + struct inode *newdir, struct dentry *newent) +{ + int err; + struct fuse_rename_in inarg; + struct fuse_conn *fc = get_fuse_conn(olddir); + struct fuse_req *req = fuse_get_request(fc); + if (!req) + return -ERESTARTNOINTR; + + memset(&inarg, 0, sizeof(inarg)); + inarg.newdir = get_node_id(newdir); + req->in.h.opcode = FUSE_RENAME; + req->in.h.nodeid = get_node_id(olddir); + req->inode = olddir; + req->inode2 = newdir; + req->in.numargs = 3; + req->in.args[0].size = sizeof(inarg); + req->in.args[0].value = &inarg; + req->in.args[1].size = oldent->d_name.len + 1; + req->in.args[1].value = oldent->d_name.name; + req->in.args[2].size = newent->d_name.len + 1; + req->in.args[2].value = newent->d_name.name; + request_send(fc, req); + err = req->out.h.error; + fuse_put_request(fc, req); + if (!err) { + fuse_invalidate_attr(olddir); + if (olddir != newdir) + fuse_invalidate_attr(newdir); + } else if (err == -EINTR) { + /* If request was interrupted, DEITY only knows if the + rename actually took place. If the invalidation + fails (e.g. some process has CWD under the renamed + directory), then there can be inconsistency between + the dcache and the real filesystem. Tough luck. */ + fuse_invalidate_entry(oldent); + if (newent->d_inode) + fuse_invalidate_entry(newent); + } + + return err; +} + +static int fuse_link(struct dentry *entry, struct inode *newdir, + struct dentry *newent) +{ + int err; + struct fuse_link_in inarg; + struct inode *inode = entry->d_inode; + struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_req *req = fuse_get_request(fc); + if (!req) + return -ERESTARTNOINTR; + + memset(&inarg, 0, sizeof(inarg)); + inarg.newdir = get_node_id(newdir); + req->in.h.opcode = FUSE_LINK; + req->inode2 = newdir; + req->in.numargs = 2; + req->in.args[0].size = sizeof(inarg); + req->in.args[0].value = &inarg; + req->in.args[1].size = newent->d_name.len + 1; + req->in.args[1].value = newent->d_name.name; + err = create_new_entry(fc, req, newdir, newent, inode->i_mode); + /* Contrary to "normal" filesystems it can happen that link + makes two "logical" inodes point to the same "physical" + inode. We invalidate the attributes of the old one, so it + will reflect changes in the backing inode (link count, + etc.) + */ + if (!err || err == -EINTR) + fuse_invalidate_attr(inode); + return err; +} + int fuse_do_getattr(struct inode *inode) { int err; @@ -341,6 +601,91 @@ static int fuse_dir_release(struct inode return 0; } +static unsigned iattr_to_fattr(struct iattr *iattr, struct fuse_attr *fattr) +{ + unsigned ivalid = iattr->ia_valid; + unsigned fvalid = 0; + + memset(fattr, 0, sizeof(*fattr)); + + if (ivalid & ATTR_MODE) + fvalid |= FATTR_MODE, fattr->mode = iattr->ia_mode; + if (ivalid & ATTR_UID) + fvalid |= FATTR_UID, fattr->uid = iattr->ia_uid; + if (ivalid & ATTR_GID) + fvalid |= FATTR_GID, fattr->gid = iattr->ia_gid; + if (ivalid & ATTR_SIZE) + fvalid |= FATTR_SIZE, fattr->size = iattr->ia_size; + /* You can only _set_ these together (they may change by themselves) */ + if ((ivalid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) { + fvalid |= FATTR_ATIME | FATTR_MTIME; + fattr->atime = iattr->ia_atime.tv_sec; + fattr->mtime = iattr->ia_mtime.tv_sec; + } + + return fvalid; +} + +static int fuse_setattr(struct dentry *entry, struct iattr *attr) +{ + struct inode *inode = entry->d_inode; + struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_inode *fi = get_fuse_inode(inode); + struct fuse_req *req; + struct fuse_setattr_in inarg; + struct fuse_attr_out outarg; + int err; + int is_truncate = 0; + + if (attr->ia_valid & ATTR_SIZE) { + unsigned long limit; + is_truncate = 1; + limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; + if (limit != RLIM_INFINITY && attr->ia_size > (loff_t) limit) { + send_sig(SIGXFSZ, current, 0); + return -EFBIG; + } + } + + req = fuse_get_request(fc); + if (!req) + return -ERESTARTNOINTR; + + memset(&inarg, 0, sizeof(inarg)); + inarg.valid = iattr_to_fattr(attr, &inarg.attr); + req->in.h.opcode = FUSE_SETATTR; + req->in.h.nodeid = get_node_id(inode); + req->inode = inode; + req->in.numargs = 1; + req->in.args[0].size = sizeof(inarg); + req->in.args[0].value = &inarg; + req->out.numargs = 1; + req->out.args[0].size = sizeof(outarg); + req->out.args[0].value = &outarg; + request_send(fc, req); + err = req->out.h.error; + fuse_put_request(fc, req); + if (!err) { + if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { + make_bad_inode(inode); + err = -EIO; + } else { + if (is_truncate) { + loff_t origsize = i_size_read(inode); + i_size_write(inode, outarg.attr.size); + if (origsize > outarg.attr.size) + vmtruncate(inode, outarg.attr.size); + } + fuse_change_attributes(inode, &outarg.attr); + fi->i_time = time_to_jiffies(outarg.attr_valid, + outarg.attr_valid_nsec); + } + } else if (err == -EINTR) + fuse_invalidate_attr(inode); + + return err; +} + static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, struct kstat *stat) { @@ -364,6 +709,15 @@ static struct dentry *fuse_lookup(struct static struct inode_operations fuse_dir_inode_operations = { .lookup = fuse_lookup, + .mkdir = fuse_mkdir, + .symlink = fuse_symlink, + .unlink = fuse_unlink, + .rmdir = fuse_rmdir, + .rename = fuse_rename, + .link = fuse_link, + .setattr = fuse_setattr, + .create = fuse_create, + .mknod = fuse_mknod, .permission = fuse_permission, .getattr = fuse_getattr, }; @@ -376,11 +730,13 @@ static struct file_operations fuse_dir_o }; static struct inode_operations fuse_common_inode_operations = { + .setattr = fuse_setattr, .permission = fuse_permission, .getattr = fuse_getattr, }; static struct inode_operations fuse_symlink_inode_operations = { + .setattr = fuse_setattr, .follow_link = fuse_follow_link, .put_link = fuse_put_link, .readlink = generic_readlink, diff -puN include/linux/fuse.h~fuse-read-write-operations include/linux/fuse.h --- 25/include/linux/fuse.h~fuse-read-write-operations Wed Jan 12 14:33:31 2005 +++ 25-akpm/include/linux/fuse.h Wed Jan 12 14:33:31 2005 @@ -52,12 +52,28 @@ struct fuse_kstatfs { __u32 namelen; }; +#define FATTR_MODE (1 << 0) +#define FATTR_UID (1 << 1) +#define FATTR_GID (1 << 2) +#define FATTR_SIZE (1 << 3) +#define FATTR_ATIME (1 << 4) +#define FATTR_MTIME (1 << 5) +#define FATTR_CTIME (1 << 6) + enum fuse_opcode { FUSE_LOOKUP = 1, FUSE_FORGET = 2, /* no reply */ FUSE_GETATTR = 3, + FUSE_SETATTR = 4, FUSE_READLINK = 5, + FUSE_SYMLINK = 6, FUSE_GETDIR = 7, + FUSE_MKNOD = 8, + FUSE_MKDIR = 9, + FUSE_UNLINK = 10, + FUSE_RMDIR = 11, + FUSE_RENAME = 12, + FUSE_LINK = 13, FUSE_STATFS = 17, FUSE_INIT = 26 }; @@ -66,6 +82,7 @@ enum fuse_opcode { #define FUSE_MAX_IN 8192 #define FUSE_NAME_MAX 1024 +#define FUSE_SYMLINK_MAX 4096 struct fuse_entry_out { __u64 nodeid; /* Inode ID */ @@ -93,6 +110,28 @@ struct fuse_getdir_out { __u32 fd; }; +struct fuse_mknod_in { + __u32 mode; + __u32 rdev; +}; + +struct fuse_mkdir_in { + __u32 mode; +}; + +struct fuse_rename_in { + __u64 newdir; +}; + +struct fuse_link_in { + __u64 newdir; +}; + +struct fuse_setattr_in { + __u32 valid; + struct fuse_attr attr; +}; + struct fuse_statfs_out { struct fuse_kstatfs st; }; _