diff options
Diffstat (limited to 'include/net/9p')
| -rw-r--r-- | include/net/9p/9p.h | 565 | ||||
| -rw-r--r-- | include/net/9p/client.h | 300 | ||||
| -rw-r--r-- | include/net/9p/transport.h | 69 |
3 files changed, 934 insertions, 0 deletions
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h new file mode 100644 index 0000000000..60cad0d200 --- /dev/null +++ b/include/net/9p/9p.h @@ -0,0 +1,565 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * 9P protocol definitions. + * + * Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net> + * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> + * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> + */ + +#ifndef NET_9P_H +#define NET_9P_H + +/** + * enum p9_debug_flags - bits for mount time debug parameter + * @P9_DEBUG_ERROR: more verbose error messages including original error string + * @P9_DEBUG_9P: 9P protocol tracing + * @P9_DEBUG_VFS: VFS API tracing + * @P9_DEBUG_CONV: protocol conversion tracing + * @P9_DEBUG_MUX: trace management of concurrent transactions + * @P9_DEBUG_TRANS: transport tracing + * @P9_DEBUG_SLABS: memory management tracing + * @P9_DEBUG_FCALL: verbose dump of protocol messages + * @P9_DEBUG_FID: fid allocation/deallocation tracking + * @P9_DEBUG_PKT: packet marshalling/unmarshalling + * @P9_DEBUG_FSC: FS-cache tracing + * @P9_DEBUG_VPKT: Verbose packet debugging (full packet dump) + * + * These flags are passed at mount time to turn on various levels of + * verbosity and tracing which will be output to the system logs. + */ + +enum p9_debug_flags { + P9_DEBUG_ERROR = (1<<0), + P9_DEBUG_9P = (1<<2), + P9_DEBUG_VFS = (1<<3), + P9_DEBUG_CONV = (1<<4), + P9_DEBUG_MUX = (1<<5), + P9_DEBUG_TRANS = (1<<6), + P9_DEBUG_SLABS = (1<<7), + P9_DEBUG_FCALL = (1<<8), + P9_DEBUG_FID = (1<<9), + P9_DEBUG_PKT = (1<<10), + P9_DEBUG_FSC = (1<<11), + P9_DEBUG_VPKT = (1<<12), + P9_DEBUG_CACHE = (1<<13), + P9_DEBUG_MMAP = (1<<14), +}; + +#ifdef CONFIG_NET_9P_DEBUG +extern unsigned int p9_debug_level; +__printf(3, 4) +void _p9_debug(enum p9_debug_flags level, const char *func, + const char *fmt, ...); +#define p9_debug(level, fmt, ...) \ + _p9_debug(level, __func__, fmt, ##__VA_ARGS__) +#else +#define p9_debug(level, fmt, ...) \ + no_printk(fmt, ##__VA_ARGS__) +#endif + +/** + * enum p9_msg_t - 9P message types + * @P9_TLERROR: not used + * @P9_RLERROR: response for any failed request for 9P2000.L + * @P9_TSTATFS: file system status request + * @P9_RSTATFS: file system status response + * @P9_TSYMLINK: make symlink request + * @P9_RSYMLINK: make symlink response + * @P9_TMKNOD: create a special file object request + * @P9_RMKNOD: create a special file object response + * @P9_TLCREATE: prepare a handle for I/O on an new file for 9P2000.L + * @P9_RLCREATE: response with file access information for 9P2000.L + * @P9_TRENAME: rename request + * @P9_RRENAME: rename response + * @P9_TMKDIR: create a directory request + * @P9_RMKDIR: create a directory response + * @P9_TVERSION: version handshake request + * @P9_RVERSION: version handshake response + * @P9_TAUTH: request to establish authentication channel + * @P9_RAUTH: response with authentication information + * @P9_TATTACH: establish user access to file service + * @P9_RATTACH: response with top level handle to file hierarchy + * @P9_TERROR: not used + * @P9_RERROR: response for any failed request + * @P9_TFLUSH: request to abort a previous request + * @P9_RFLUSH: response when previous request has been cancelled + * @P9_TWALK: descend a directory hierarchy + * @P9_RWALK: response with new handle for position within hierarchy + * @P9_TOPEN: prepare a handle for I/O on an existing file + * @P9_ROPEN: response with file access information + * @P9_TCREATE: prepare a handle for I/O on a new file + * @P9_RCREATE: response with file access information + * @P9_TREAD: request to transfer data from a file or directory + * @P9_RREAD: response with data requested + * @P9_TWRITE: reuqest to transfer data to a file + * @P9_RWRITE: response with out much data was transferred to file + * @P9_TCLUNK: forget about a handle to an entity within the file system + * @P9_RCLUNK: response when server has forgotten about the handle + * @P9_TREMOVE: request to remove an entity from the hierarchy + * @P9_RREMOVE: response when server has removed the entity + * @P9_TSTAT: request file entity attributes + * @P9_RSTAT: response with file entity attributes + * @P9_TWSTAT: request to update file entity attributes + * @P9_RWSTAT: response when file entity attributes are updated + * + * There are 14 basic operations in 9P2000, paired as + * requests and responses. The one special case is ERROR + * as there is no @P9_TERROR request for clients to transmit to + * the server, but the server may respond to any other request + * with an @P9_RERROR. + * + * See Also: http://plan9.bell-labs.com/sys/man/5/INDEX.html + */ + +enum p9_msg_t { + P9_TLERROR = 6, + P9_RLERROR, + P9_TSTATFS = 8, + P9_RSTATFS, + P9_TLOPEN = 12, + P9_RLOPEN, + P9_TLCREATE = 14, + P9_RLCREATE, + P9_TSYMLINK = 16, + P9_RSYMLINK, + P9_TMKNOD = 18, + P9_RMKNOD, + P9_TRENAME = 20, + P9_RRENAME, + P9_TREADLINK = 22, + P9_RREADLINK, + P9_TGETATTR = 24, + P9_RGETATTR, + P9_TSETATTR = 26, + P9_RSETATTR, + P9_TXATTRWALK = 30, + P9_RXATTRWALK, + P9_TXATTRCREATE = 32, + P9_RXATTRCREATE, + P9_TREADDIR = 40, + P9_RREADDIR, + P9_TFSYNC = 50, + P9_RFSYNC, + P9_TLOCK = 52, + P9_RLOCK, + P9_TGETLOCK = 54, + P9_RGETLOCK, + P9_TLINK = 70, + P9_RLINK, + P9_TMKDIR = 72, + P9_RMKDIR, + P9_TRENAMEAT = 74, + P9_RRENAMEAT, + P9_TUNLINKAT = 76, + P9_RUNLINKAT, + P9_TVERSION = 100, + P9_RVERSION, + P9_TAUTH = 102, + P9_RAUTH, + P9_TATTACH = 104, + P9_RATTACH, + P9_TERROR = 106, + P9_RERROR, + P9_TFLUSH = 108, + P9_RFLUSH, + P9_TWALK = 110, + P9_RWALK, + P9_TOPEN = 112, + P9_ROPEN, + P9_TCREATE = 114, + P9_RCREATE, + P9_TREAD = 116, + P9_RREAD, + P9_TWRITE = 118, + P9_RWRITE, + P9_TCLUNK = 120, + P9_RCLUNK, + P9_TREMOVE = 122, + P9_RREMOVE, + P9_TSTAT = 124, + P9_RSTAT, + P9_TWSTAT = 126, + P9_RWSTAT, +}; + +/** + * enum p9_open_mode_t - 9P open modes + * @P9_OREAD: open file for reading only + * @P9_OWRITE: open file for writing only + * @P9_ORDWR: open file for reading or writing + * @P9_OEXEC: open file for execution + * @P9_OTRUNC: truncate file to zero-length before opening it + * @P9_OREXEC: close the file when an exec(2) system call is made + * @P9_ORCLOSE: remove the file when the file is closed + * @P9_OAPPEND: open the file and seek to the end + * @P9_OEXCL: only create a file, do not open it + * + * 9P open modes differ slightly from Posix standard modes. + * In particular, there are extra modes which specify different + * semantic behaviors than may be available on standard Posix + * systems. For example, @P9_OREXEC and @P9_ORCLOSE are modes that + * most likely will not be issued from the Linux VFS client, but may + * be supported by servers. + * + * See Also: http://plan9.bell-labs.com/magic/man2html/2/open + */ + +enum p9_open_mode_t { + P9_OREAD = 0x00, + P9_OWRITE = 0x01, + P9_ORDWR = 0x02, + P9_OEXEC = 0x03, + P9_OTRUNC = 0x10, + P9_OREXEC = 0x20, + P9_ORCLOSE = 0x40, + P9_OAPPEND = 0x80, + P9_OEXCL = 0x1000, + P9L_MODE_MASK = 0x1FFF, /* don't send anything under this to server */ + P9L_DIRECT = 0x2000, /* cache disabled */ + P9L_NOWRITECACHE = 0x4000, /* no write caching */ + P9L_LOOSE = 0x8000, /* loose cache */ +}; + +/** + * enum p9_perm_t - 9P permissions + * @P9_DMDIR: mode bit for directories + * @P9_DMAPPEND: mode bit for is append-only + * @P9_DMEXCL: mode bit for excluse use (only one open handle allowed) + * @P9_DMMOUNT: mode bit for mount points + * @P9_DMAUTH: mode bit for authentication file + * @P9_DMTMP: mode bit for non-backed-up files + * @P9_DMSYMLINK: mode bit for symbolic links (9P2000.u) + * @P9_DMLINK: mode bit for hard-link (9P2000.u) + * @P9_DMDEVICE: mode bit for device files (9P2000.u) + * @P9_DMNAMEDPIPE: mode bit for named pipe (9P2000.u) + * @P9_DMSOCKET: mode bit for socket (9P2000.u) + * @P9_DMSETUID: mode bit for setuid (9P2000.u) + * @P9_DMSETGID: mode bit for setgid (9P2000.u) + * @P9_DMSETVTX: mode bit for sticky bit (9P2000.u) + * + * 9P permissions differ slightly from Posix standard modes. + * + * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat + */ +enum p9_perm_t { + P9_DMDIR = 0x80000000, + P9_DMAPPEND = 0x40000000, + P9_DMEXCL = 0x20000000, + P9_DMMOUNT = 0x10000000, + P9_DMAUTH = 0x08000000, + P9_DMTMP = 0x04000000, +/* 9P2000.u extensions */ + P9_DMSYMLINK = 0x02000000, + P9_DMLINK = 0x01000000, + P9_DMDEVICE = 0x00800000, + P9_DMNAMEDPIPE = 0x00200000, + P9_DMSOCKET = 0x00100000, + P9_DMSETUID = 0x00080000, + P9_DMSETGID = 0x00040000, + P9_DMSETVTX = 0x00010000, +}; + +/* 9p2000.L open flags */ +#define P9_DOTL_RDONLY 00000000 +#define P9_DOTL_WRONLY 00000001 +#define P9_DOTL_RDWR 00000002 +#define P9_DOTL_NOACCESS 00000003 +#define P9_DOTL_CREATE 00000100 +#define P9_DOTL_EXCL 00000200 +#define P9_DOTL_NOCTTY 00000400 +#define P9_DOTL_TRUNC 00001000 +#define P9_DOTL_APPEND 00002000 +#define P9_DOTL_NONBLOCK 00004000 +#define P9_DOTL_DSYNC 00010000 +#define P9_DOTL_FASYNC 00020000 +#define P9_DOTL_DIRECT 00040000 +#define P9_DOTL_LARGEFILE 00100000 +#define P9_DOTL_DIRECTORY 00200000 +#define P9_DOTL_NOFOLLOW 00400000 +#define P9_DOTL_NOATIME 01000000 +#define P9_DOTL_CLOEXEC 02000000 +#define P9_DOTL_SYNC 04000000 + +/* 9p2000.L at flags */ +#define P9_DOTL_AT_REMOVEDIR 0x200 + +/* 9p2000.L lock type */ +#define P9_LOCK_TYPE_RDLCK 0 +#define P9_LOCK_TYPE_WRLCK 1 +#define P9_LOCK_TYPE_UNLCK 2 + +/** + * enum p9_qid_t - QID types + * @P9_QTDIR: directory + * @P9_QTAPPEND: append-only + * @P9_QTEXCL: excluse use (only one open handle allowed) + * @P9_QTMOUNT: mount points + * @P9_QTAUTH: authentication file + * @P9_QTTMP: non-backed-up files + * @P9_QTSYMLINK: symbolic links (9P2000.u) + * @P9_QTLINK: hard-link (9P2000.u) + * @P9_QTFILE: normal files + * + * QID types are a subset of permissions - they are primarily + * used to differentiate semantics for a file system entity via + * a jump-table. Their value is also the most significant 16 bits + * of the permission_t + * + * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat + */ +enum p9_qid_t { + P9_QTDIR = 0x80, + P9_QTAPPEND = 0x40, + P9_QTEXCL = 0x20, + P9_QTMOUNT = 0x10, + P9_QTAUTH = 0x08, + P9_QTTMP = 0x04, + P9_QTSYMLINK = 0x02, + P9_QTLINK = 0x01, + P9_QTFILE = 0x00, +}; + +/* 9P Magic Numbers */ +#define P9_NOTAG ((u16)(~0)) +#define P9_NOFID ((u32)(~0)) +#define P9_MAXWELEM 16 + +/* Minimal header size: size[4] type[1] tag[2] */ +#define P9_HDRSZ 7 + +/* ample room for Twrite/Rread header */ +#define P9_IOHDRSZ 24 + +/* Room for readdir header */ +#define P9_READDIRHDRSZ 24 + +/* size of header for zero copy read/write */ +#define P9_ZC_HDR_SZ 4096 + +/* maximum length of an error string */ +#define P9_ERRMAX 128 + +/** + * struct p9_qid - file system entity information + * @type: 8-bit type &p9_qid_t + * @version: 16-bit monotonically incrementing version number + * @path: 64-bit per-server-unique ID for a file system element + * + * qids are identifiers used by 9P servers to track file system + * entities. The type is used to differentiate semantics for operations + * on the entity (ie. read means something different on a directory than + * on a file). The path provides a server unique index for an entity + * (roughly analogous to an inode number), while the version is updated + * every time a file is modified and can be used to maintain cache + * coherency between clients and serves. + * Servers will often differentiate purely synthetic entities by setting + * their version to 0, signaling that they should never be cached and + * should be accessed synchronously. + * + * See Also://plan9.bell-labs.com/magic/man2html/2/stat + */ + +struct p9_qid { + u8 type; + u32 version; + u64 path; +}; + +/** + * struct p9_wstat - file system metadata information + * @size: length prefix for this stat structure instance + * @type: the type of the server (equivalent to a major number) + * @dev: the sub-type of the server (equivalent to a minor number) + * @qid: unique id from the server of type &p9_qid + * @mode: Plan 9 format permissions of type &p9_perm_t + * @atime: Last access/read time + * @mtime: Last modify/write time + * @length: file length + * @name: last element of path (aka filename) + * @uid: owner name + * @gid: group owner + * @muid: last modifier + * @extension: area used to encode extended UNIX support + * @n_uid: numeric user id of owner (part of 9p2000.u extension) + * @n_gid: numeric group id (part of 9p2000.u extension) + * @n_muid: numeric user id of laster modifier (part of 9p2000.u extension) + * + * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat + */ + +struct p9_wstat { + u16 size; + u16 type; + u32 dev; + struct p9_qid qid; + u32 mode; + u32 atime; + u32 mtime; + u64 length; + const char *name; + const char *uid; + const char *gid; + const char *muid; + char *extension; /* 9p2000.u extensions */ + kuid_t n_uid; /* 9p2000.u extensions */ + kgid_t n_gid; /* 9p2000.u extensions */ + kuid_t n_muid; /* 9p2000.u extensions */ +}; + +struct p9_stat_dotl { + u64 st_result_mask; + struct p9_qid qid; + u32 st_mode; + kuid_t st_uid; + kgid_t st_gid; + u64 st_nlink; + u64 st_rdev; + u64 st_size; + u64 st_blksize; + u64 st_blocks; + u64 st_atime_sec; + u64 st_atime_nsec; + u64 st_mtime_sec; + u64 st_mtime_nsec; + u64 st_ctime_sec; + u64 st_ctime_nsec; + u64 st_btime_sec; + u64 st_btime_nsec; + u64 st_gen; + u64 st_data_version; +}; + +#define P9_STATS_MODE 0x00000001ULL +#define P9_STATS_NLINK 0x00000002ULL +#define P9_STATS_UID 0x00000004ULL +#define P9_STATS_GID 0x00000008ULL +#define P9_STATS_RDEV 0x00000010ULL +#define P9_STATS_ATIME 0x00000020ULL +#define P9_STATS_MTIME 0x00000040ULL +#define P9_STATS_CTIME 0x00000080ULL +#define P9_STATS_INO 0x00000100ULL +#define P9_STATS_SIZE 0x00000200ULL +#define P9_STATS_BLOCKS 0x00000400ULL + +#define P9_STATS_BTIME 0x00000800ULL +#define P9_STATS_GEN 0x00001000ULL +#define P9_STATS_DATA_VERSION 0x00002000ULL + +#define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ +#define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ + +/** + * struct p9_iattr_dotl - P9 inode attribute for setattr + * @valid: bitfield specifying which fields are valid + * same as in struct iattr + * @mode: File permission bits + * @uid: user id of owner + * @gid: group id + * @size: File size + * @atime_sec: Last access time, seconds + * @atime_nsec: Last access time, nanoseconds + * @mtime_sec: Last modification time, seconds + * @mtime_nsec: Last modification time, nanoseconds + */ + +struct p9_iattr_dotl { + u32 valid; + u32 mode; + kuid_t uid; + kgid_t gid; + u64 size; + u64 atime_sec; + u64 atime_nsec; + u64 mtime_sec; + u64 mtime_nsec; +}; + +#define P9_LOCK_SUCCESS 0 +#define P9_LOCK_BLOCKED 1 +#define P9_LOCK_ERROR 2 +#define P9_LOCK_GRACE 3 + +#define P9_LOCK_FLAGS_BLOCK 1 +#define P9_LOCK_FLAGS_RECLAIM 2 + +/* struct p9_flock: POSIX lock structure + * @type - type of lock + * @flags - lock flags + * @start - starting offset of the lock + * @length - number of bytes + * @proc_id - process id which wants to take lock + * @client_id - client id + */ + +struct p9_flock { + u8 type; + u32 flags; + u64 start; + u64 length; + u32 proc_id; + char *client_id; +}; + +/* struct p9_getlock: getlock structure + * @type - type of lock + * @start - starting offset of the lock + * @length - number of bytes + * @proc_id - process id which wants to take lock + * @client_id - client id + */ + +struct p9_getlock { + u8 type; + u64 start; + u64 length; + u32 proc_id; + char *client_id; +}; + +struct p9_rstatfs { + u32 type; + u32 bsize; + u64 blocks; + u64 bfree; + u64 bavail; + u64 files; + u64 ffree; + u64 fsid; + u32 namelen; +}; + +/** + * struct p9_fcall - primary packet structure + * @size: prefixed length of the structure + * @id: protocol operating identifier of type &p9_msg_t + * @tag: transaction id of the request + * @offset: used by marshalling routines to track current position in buffer + * @capacity: used by marshalling routines to track total malloc'd capacity + * @sdata: payload + * @zc: whether zero-copy is used + * + * &p9_fcall represents the structure for all 9P RPC + * transactions. Requests are packaged into fcalls, and reponses + * must be extracted from them. + * + * See Also: http://plan9.bell-labs.com/magic/man2html/2/fcall + */ + +struct p9_fcall { + u32 size; + u8 id; + u16 tag; + + size_t offset; + size_t capacity; + + struct kmem_cache *cache; + u8 *sdata; + bool zc; +}; + +int p9_errstr2errno(char *errstr, int len); + +int p9_error_init(void); +#endif /* NET_9P_H */ diff --git a/include/net/9p/client.h b/include/net/9p/client.h new file mode 100644 index 0000000000..78ebcf782c --- /dev/null +++ b/include/net/9p/client.h @@ -0,0 +1,300 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * 9P Client Definitions + * + * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> + * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> + */ + +#ifndef NET_9P_CLIENT_H +#define NET_9P_CLIENT_H + +#include <linux/utsname.h> +#include <linux/idr.h> +#include <linux/tracepoint-defs.h> + +/* Number of requests per row */ +#define P9_ROW_MAXTAG 255 + +/** enum p9_proto_versions - 9P protocol versions + * @p9_proto_legacy: 9P Legacy mode, pre-9P2000.u + * @p9_proto_2000u: 9P2000.u extension + * @p9_proto_2000L: 9P2000.L extension + */ + +enum p9_proto_versions { + p9_proto_legacy, + p9_proto_2000u, + p9_proto_2000L, +}; + + +/** + * enum p9_trans_status - different states of underlying transports + * @Connected: transport is connected and healthy + * @Disconnected: transport has been disconnected + * @Hung: transport is connected by wedged + * + * This enumeration details the various states a transport + * instatiation can be in. + */ + +enum p9_trans_status { + Connected, + BeginDisconnect, + Disconnected, + Hung, +}; + +/** + * enum p9_req_status_t - status of a request + * @REQ_STATUS_ALLOC: request has been allocated but not sent + * @REQ_STATUS_UNSENT: request waiting to be sent + * @REQ_STATUS_SENT: request sent to server + * @REQ_STATUS_RCVD: response received from server + * @REQ_STATUS_FLSHD: request has been flushed + * @REQ_STATUS_ERROR: request encountered an error on the client side + */ + +enum p9_req_status_t { + REQ_STATUS_ALLOC, + REQ_STATUS_UNSENT, + REQ_STATUS_SENT, + REQ_STATUS_RCVD, + REQ_STATUS_FLSHD, + REQ_STATUS_ERROR, +}; + +/** + * struct p9_req_t - request slots + * @status: status of this request slot + * @t_err: transport error + * @wq: wait_queue for the client to block on for this request + * @tc: the request fcall structure + * @rc: the response fcall structure + * @req_list: link for higher level objects to chain requests + */ +struct p9_req_t { + int status; + int t_err; + refcount_t refcount; + wait_queue_head_t wq; + struct p9_fcall tc; + struct p9_fcall rc; + struct list_head req_list; +}; + +/** + * struct p9_client - per client instance state + * @lock: protect @fids and @reqs + * @msize: maximum data size negotiated by protocol + * @proto_version: 9P protocol version to use + * @trans_mod: module API instantiated with this client + * @status: connection state + * @trans: tranport instance state and API + * @fids: All active FID handles + * @reqs: All active requests. + * @name: node name used as client id + * + * The client structure is used to keep track of various per-client + * state that has been instantiated. + */ +struct p9_client { + spinlock_t lock; + unsigned int msize; + unsigned char proto_version; + struct p9_trans_module *trans_mod; + enum p9_trans_status status; + void *trans; + struct kmem_cache *fcall_cache; + + union { + struct { + int rfd; + int wfd; + } fd; + struct { + u16 port; + bool privport; + + } tcp; + } trans_opts; + + struct idr fids; + struct idr reqs; + + char name[__NEW_UTS_LEN + 1]; +}; + +/** + * struct p9_fid - file system entity handle + * @clnt: back pointer to instantiating &p9_client + * @fid: numeric identifier for this handle + * @mode: current mode of this fid (enum?) + * @qid: the &p9_qid server identifier this handle points to + * @iounit: the server reported maximum transaction size for this file + * @uid: the numeric uid of the local user who owns this handle + * @rdir: readdir accounting structure (allocated on demand) + * @dlist: per-dentry fid tracking + * + * TODO: This needs lots of explanation. + */ +enum fid_source { + FID_FROM_OTHER, + FID_FROM_INODE, + FID_FROM_DENTRY, +}; + +struct p9_fid { + struct p9_client *clnt; + u32 fid; + refcount_t count; + int mode; + struct p9_qid qid; + u32 iounit; + kuid_t uid; + + void *rdir; + + struct hlist_node dlist; /* list of all fids attached to a dentry */ + struct hlist_node ilist; +}; + +/** + * struct p9_dirent - directory entry structure + * @qid: The p9 server qid for this dirent + * @d_off: offset to the next dirent + * @d_type: type of file + * @d_name: file name + */ + +struct p9_dirent { + struct p9_qid qid; + u64 d_off; + unsigned char d_type; + char d_name[256]; +}; + +struct iov_iter; + +int p9_show_client_options(struct seq_file *m, struct p9_client *clnt); +int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb); +int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, + const char *name); +int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, + struct p9_fid *newdirfid, const char *new_name); +struct p9_client *p9_client_create(const char *dev_name, char *options); +void p9_client_destroy(struct p9_client *clnt); +void p9_client_disconnect(struct p9_client *clnt); +void p9_client_begin_disconnect(struct p9_client *clnt); +struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, + const char *uname, kuid_t n_uname, const char *aname); +struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, + const unsigned char * const *wnames, int clone); +int p9_client_open(struct p9_fid *fid, int mode); +int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, + char *extension); +int p9_client_link(struct p9_fid *fid, struct p9_fid *oldfid, const char *newname); +int p9_client_symlink(struct p9_fid *fid, const char *name, const char *symname, + kgid_t gid, struct p9_qid *qid); +int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, + kgid_t gid, struct p9_qid *qid); +int p9_client_clunk(struct p9_fid *fid); +int p9_client_fsync(struct p9_fid *fid, int datasync); +int p9_client_remove(struct p9_fid *fid); +int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags); +int p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err); +int p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, + int *err); +int p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err); +int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset); +int p9dirent_read(struct p9_client *clnt, char *buf, int len, + struct p9_dirent *dirent); +struct p9_wstat *p9_client_stat(struct p9_fid *fid); +int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst); +int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *attr); + +struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, + u64 request_mask); + +int p9_client_mknod_dotl(struct p9_fid *oldfid, const char *name, int mode, + dev_t rdev, kgid_t gid, struct p9_qid *qid); +int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, + kgid_t gid, struct p9_qid *qid); +int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status); +int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *fl); +void p9_fcall_fini(struct p9_fcall *fc); +struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag); + +static inline void p9_req_get(struct p9_req_t *r) +{ + refcount_inc(&r->refcount); +} + +static inline int p9_req_try_get(struct p9_req_t *r) +{ + return refcount_inc_not_zero(&r->refcount); +} + +int p9_req_put(struct p9_client *c, struct p9_req_t *r); + +/* We cannot have the real tracepoints in header files, + * use a wrapper function */ +DECLARE_TRACEPOINT(9p_fid_ref); +void do_trace_9p_fid_get(struct p9_fid *fid); +void do_trace_9p_fid_put(struct p9_fid *fid); + +/* fid reference counting helpers: + * - fids used for any length of time should always be referenced through + * p9_fid_get(), and released with p9_fid_put() + * - v9fs_fid_lookup() or similar will automatically call get for you + * and also require a put + * - the *_fid_add() helpers will stash the fid in the inode, + * at which point it is the responsibility of evict_inode() + * to call the put + * - the last put will automatically send a clunk to the server + */ +static inline struct p9_fid *p9_fid_get(struct p9_fid *fid) +{ + if (tracepoint_enabled(9p_fid_ref)) + do_trace_9p_fid_get(fid); + + refcount_inc(&fid->count); + + return fid; +} + +static inline int p9_fid_put(struct p9_fid *fid) +{ + if (!fid || IS_ERR(fid)) + return 0; + + if (tracepoint_enabled(9p_fid_ref)) + do_trace_9p_fid_put(fid); + + if (!refcount_dec_and_test(&fid->count)) + return 0; + + return p9_client_clunk(fid); +} + +void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status); + +int p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, + int16_t *tag, int rewind); +int p9stat_read(struct p9_client *clnt, char *buf, int len, + struct p9_wstat *st); +void p9stat_free(struct p9_wstat *stbuf); + +int p9_is_proto_dotu(struct p9_client *clnt); +int p9_is_proto_dotl(struct p9_client *clnt); +struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, + const char *attr_name, u64 *attr_size); +int p9_client_xattrcreate(struct p9_fid *fid, const char *name, + u64 attr_size, int flags); +int p9_client_readlink(struct p9_fid *fid, char **target); + +int p9_client_init(void); +void p9_client_exit(void); + +#endif /* NET_9P_CLIENT_H */ diff --git a/include/net/9p/transport.h b/include/net/9p/transport.h new file mode 100644 index 0000000000..766ec07c95 --- /dev/null +++ b/include/net/9p/transport.h @@ -0,0 +1,69 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Transport Definition + * + * Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net> + * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> + */ + +#ifndef NET_9P_TRANSPORT_H +#define NET_9P_TRANSPORT_H + +#include <linux/module.h> + +#define P9_DEF_MIN_RESVPORT (665U) +#define P9_DEF_MAX_RESVPORT (1023U) + +/** + * struct p9_trans_module - transport module interface + * @list: used to maintain a list of currently available transports + * @name: the human-readable name of the transport + * @maxsize: transport provided maximum packet size + * @pooled_rbuffers: currently only set for RDMA transport which pulls the + * response buffers from a shared pool, and accordingly + * we're less flexible when choosing the response message + * size in this case + * @def: set if this transport should be considered the default + * @create: member function to create a new connection on this transport + * @close: member function to discard a connection on this transport + * @request: member function to issue a request to the transport + * @cancel: member function to cancel a request (if it hasn't been sent) + * @cancelled: member function to notify that a cancelled request will not + * receive a reply + * + * This is the basic API for a transport module which is registered by the + * transport module with the 9P core network module and used by the client + * to instantiate a new connection on a transport. + * + * The transport module list is protected by v9fs_trans_lock. + */ + +struct p9_trans_module { + struct list_head list; + char *name; /* name of transport */ + int maxsize; /* max message size of transport */ + bool pooled_rbuffers; + int def; /* this transport should be default */ + struct module *owner; + int (*create)(struct p9_client *client, + const char *devname, char *args); + void (*close)(struct p9_client *client); + int (*request)(struct p9_client *client, struct p9_req_t *req); + int (*cancel)(struct p9_client *client, struct p9_req_t *req); + int (*cancelled)(struct p9_client *client, struct p9_req_t *req); + int (*zc_request)(struct p9_client *client, struct p9_req_t *req, + struct iov_iter *uidata, struct iov_iter *uodata, + int inlen, int outlen, int in_hdr_len); + int (*show_options)(struct seq_file *m, struct p9_client *client); +}; + +void v9fs_register_trans(struct p9_trans_module *m); +void v9fs_unregister_trans(struct p9_trans_module *m); +struct p9_trans_module *v9fs_get_trans_by_name(const char *s); +struct p9_trans_module *v9fs_get_default_trans(void); +void v9fs_put_trans(struct p9_trans_module *m); + +#define MODULE_ALIAS_9P(transport) \ + MODULE_ALIAS("9p-" transport) + +#endif /* NET_9P_TRANSPORT_H */ |