/* Copyright (C) 1994, 1995, 1996 Free Software Foundation This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #ifndef _HURD_NETFS_H_ #define _HURD_NETFS_H_ #include #include #include #include #include /* This library supports client-side network file system implementations. It is analogous to the diskfs library provided for disk-based filesystems. */ struct protid { struct port_info pi; /* User identification */ struct netcred *credential; /* Object this refers to */ struct peropen *po; /* Shared memory I/O information. */ memory_object_t shared_object; struct shared_io *mapped; }; /* One of these is created for each open */ struct peropen { off_t filepointer; int lock_status; int refcnt; int openstat; mach_port_t dotdotport; struct node *np; }; /* A unique one of these exists for each node currently in use. */ struct node { struct node *next, **prevp; /* Protocol specific stuff. */ struct netnode *nn; struct stat nn_stat; int istranslated; struct mutex lock; int references; mach_port_t sockaddr; int owner; struct transbox transbox; struct lock_box userlock; struct conch conch; struct dirmod *dirmod_reqs; }; /* The user must define this function. Make sure that NP->nn_stat is filled with current information. CRED identifies the user responsible for the operation. */ error_t netfs_validate_stat (struct node *NP, struct netcred *cred); /* The user must define this function. This should attempt a chmod call for the user specified by CRED on node NODE, to change the owner to UID and the group to GID. */ error_t netfs_attempt_chown (struct netcred *cred, struct node *np, uid_t uid, uid_t gid); /* The user must define this function. This should attempt a chauthor call for the user specified by CRED on node NODE, to change the author to AUTHOR. */ error_t netfs_attempt_chauthor (struct netcred *cred, struct node *np, uid_t author); /* The user must define this function. This should attempt a chmod call for the user specified by CRED on node NODE, to change the mode to MODE. Unlike the normal Unix and Hurd meaning of chmod, this function is also used to attempt to change files into other types. If such a transition is attempted which is impossible, then return EOPNOTSUPP. */ error_t netfs_attempt_chmod (struct netcred *cred, struct node *np, mode_t mode); /* The user must define this function. Attempt to turn NODE (user CRED) into a symlink with target NAME. */ error_t netfs_attempt_mksymlink (struct netcred *cred, struct node *np, char *name); /* The user must define this function. Attempt to turn NODE (user CRED) into a device. TYPE is either S_IFBLK or S_IFCHR. */ error_t netfs_attempt_mkdev (struct netcred *cred, struct node *np, mode_t type, dev_t indexes); /* The user must define this function. Attempt to set the passive translator record for FILE to ARGZ (of length ARGZLEN) for user CRED. */ error_t netfs_set_translator (struct netcred *cred, struct node *np, char *argz, size_t argzlen); /* The user must define this function. This should attempt a chflags call for the user specified by CRED on node NODE, to change the flags to FLAGS. */ error_t netfs_attempt_chflags (struct netcred *cred, struct node *np, int flags); /* The user must define this function. This should attempt a utimes call for the user specified by CRED on node NODE, to change the atime to ATIME and the mtime to MTIME. */ error_t netfs_attempt_utimes (struct netcred *cred, struct node *np, struct timespec *atime, struct timespec *mtime); /* The user must define this function. This should attempt to set the size of the file NODE (for user CRED) to SIZE bytes long. */ error_t netfs_attempt_set_size (struct netcred *cred, struct node *np, off_t size); /* The user must define this function. This should attempt to fetch filesystem status information for the remote filesystem, for the user CRED. */ error_t netfs_attempt_statfs (struct netcred *cred, struct node *np, struct statfs *st); /* The user must define this function. This should sync the file NP completely to disk, for the user CRED. If WAIT is set, return only after sync is completely finished. */ error_t netfs_attempt_sync (struct netcred *cred, struct node *np, int wait); /* The user must define this function. This should sync the entire remote filesystem. If WAIT is set, return only after sync is completely finished. */ error_t netfs_attempt_syncfs (struct netcred *cred, int wait); /* The user must define this function. Lookup NAME in DIR for USER; set *NP to the found name upon return. If the name was not found, then return ENOENT. On any error, clear *NP. (*NP, if found, should be locked, this call should unlock DIR no matter what.) */ error_t netfs_attempt_lookup (struct netcred *user, struct node *dir, char *name, struct node **np); /* The user must define this function. Delete NAME in DIR for USER. */ error_t netfs_attempt_unlink (struct netcred *user, struct node *dir, char *name); /* Note that in this one call, neither of the specific nodes are locked. */ error_t netfs_attempt_rename (struct netcred *user, struct node *fromdir, char *fromname, struct node *todir, char *toname, int excl); /* The user must define this function. Attempt to create a new directory named NAME in DIR for USER with mode MODE. */ error_t netfs_attempt_mkdir (struct netcred *user, struct node *dir, char *name, mode_t mode); /* The user must define this function. Attempt to remove directory named NAME in DIR for USER. */ error_t netfs_attempt_rmdir (struct netcred *user, struct node *dir, char *name); /* The user must define this function. Create a link in DIR with name NAME to FILE for USER. Note that neither DIR nor FILE are locked. If EXCL is set, do not delete the target, but return EEXIST if NAME is already found in DIR. */ error_t netfs_attempt_link (struct netcred *user, struct node *dir, struct node *file, char *name, int excl); /* The user must define this function. Attempt to create an anonymous file related to DIR for USER with MODE. Set *NP to the returned file upon success. No matter what, unlock DIR. */ error_t netfs_attempt_mkfile (struct netcred *user, struct node *dir, mode_t mode, struct node **np); /* The user must define this function. Attempt to create a file named NAME in DIR for USER with MODE. Set *NP to the new node upon return. On any error, clear *NP. *NP should be locked on success; no matter what, unlock DIR before returning. */ error_t netfs_attempt_create_file (struct netcred *user, struct node *dir, char *name, mode_t mode, struct node **np); /* The user must define this function. Read the contents of NP (a symlink), for USER, into BUF. */ error_t netfs_attempt_readlink (struct netcred *user, struct node *np, char *buf); /* The user must define this function. Node NP is being opened by USER, with FLAGS. NEWNODE is nonzero if we just created this node. Return an error if we should not permit the open to complete because of a permission restriction. */ error_t netfs_check_open_permissions (struct netcred *user, struct node *np, int flags, int newnode); /* The user must define this function. Read from the file NP for user CRED starting at OFFSET and continuing for up to *LEN bytes. Put the data at DATA. Set *LEN to the amount successfully read upon return. */ error_t netfs_attempt_read (struct netcred *cred, struct node *np, off_t offset, size_t *len, void *data); /* The user must define this function. Write to the file NP for user CRED starting at OFSET and continuing for up to *LEN bytes from DATA. Set *LEN to the amount seccessfully written upon return. */ error_t netfs_attempt_write (struct netcred *cred, struct node *np, off_t offset, size_t *len, void *data); /* The user must define this function. Return the valid access types (bitwise OR of O_READ, O_WRITE, and O_EXEC) in *TYPES for file NP and user CRED. */ void netfs_report_access (struct netcred *cred, struct node *np, int *types); /* The user must define this function. Malloc and fill two arrays with the uids and gids from the specified credential. */ void netfs_interpret_credential (struct netcred *cred, uid_t **uids, int *nuids, uid_t **gids, int *ngids); /* The user must define this function. Return a (virtual or physical) copy of CRED. */ struct netcred *netfs_copy_credential (struct netcred *cred); /* The user must define this function. The specified credential is not in use any more. */ void netfs_drop_credential (struct netcred *cred); /* The user must define this function. Create a new credential from the specified UID and GID arrays. */ struct netcred *netfs_make_credential (uid_t *uids, int nuids, uid_t *gids, int ngids); /* The user must define this function. Node NP is all done; free all its associated storage. */ void netfs_node_norefs (struct node *np); error_t netfs_get_dirents (struct netcred *, struct node *, int, int, char **, mach_msg_type_number_t *, vm_size_t, int *); /* Option parsing */ /* Parse and execute the runtime options in ARGZ & ARGZ_LEN. EINVAL is returned if some option is unrecognized. The default definition of this routine will parse them using NETFS_RUNTIME_ARGP, which see. */ error_t netfs_set_options (char *argz, size_t argz_len); /* Return an argz string describing the current options. Fill *ARGZ with a pointer to newly malloced storage holding the list and *LEN to the length of that storage. The default definition of this routine simply initializes *ARGZ and *ARGZ_LEN to 0 and calls netfs_append_std_options. */ error_t netfs_get_options (char **argz, size_t *argz_len); /* If this is defined or set to a pointer to an argp structure, it will be used by the default netfs_set_options to handle runtime option parsing. The default definition is initialized to a pointer to NETFS_STD_RUNTIME_ARGP. Setting this variable is the usual way to add option parsing to a program using libnetfs. */ extern struct argp *netfs_runtime_argp; /* An argp for the standard netfs runtime options. The default definition of NETFS_RUNTIME_ARGP points to this, although if the user redefines that, he may chain this onto his argp as well. */ extern const struct argp netfs_std_runtime_argp; /* An argp structure for the standard netfs command line arguments. The user may call argp_parse on this to parse the command line, chain it onto the end of his own argp structure, or ignore it completely. */ extern const struct argp netfs_std_startup_argp; /* *Appends* to ARGZ & ARGZ_LEN '\0'-separated options describing the standard netfs option state (note that unlike netfs_get_options, ARGZ & ARGZ_LEN must already have a sane value). */ error_t netfs_append_std_options (char **argz, size_t *argz_len); /* Definitions provided by netfs. */ struct node *netfs_make_node (struct netnode *); mach_port_t netfs_startup (mach_port_t, int); extern spin_lock_t netfs_node_refcnt_lock; extern int netfs_maxsymlinks; void netfs_init (void); void netfs_server_loop (void); struct protid *netfs_make_protid (struct peropen *, struct netcred *); struct peropen *netfs_make_peropen (struct node *, int, mach_port_t); void netfs_drop_node (struct node *); void netfs_release_protid (void *); void netfs_release_peropen (struct peropen *); int netfs_demuxer (mach_msg_header_t *, mach_msg_header_t *); error_t netfs_shutdown (int); extern struct port_class *netfs_protid_class; extern struct port_class *netfs_control_class; extern struct port_bucket *netfs_port_bucket; extern struct node *netfs_root_node; extern mach_port_t netfs_fsys_identity; extern auth_t netfs_auth_server_port; extern inline void netfs_nref (struct node *np) { spin_lock (&netfs_node_refcnt_lock); np->references++; spin_unlock (&netfs_node_refcnt_lock); } extern inline void netfs_nrele (struct node *np) { spin_lock (&netfs_node_refcnt_lock); assert (np->references); np->references--; if (np->references == 0) { mutex_lock (&np->lock); netfs_drop_node (np); } else spin_unlock (&netfs_node_refcnt_lock); } extern inline void netfs_nput (struct node *np) { spin_lock (&netfs_node_refcnt_lock); assert (np->references); np->references--; if (np->references == 0) netfs_drop_node (np); else { spin_unlock (&netfs_node_refcnt_lock); mutex_unlock (&np->lock); } } /* Mig gook. */ typedef struct protid *protid_t; #endif /* _HURD_NETFS_H_ */