/* * net/9p/clnt.c * * 9P Client * * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. * * 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: * Free Software Foundation * 51 Franklin Street, Fifth Floor * Boston, MA 02111-1301 USA * */ #include <linux/module.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/poll.h> #include <linux/idr.h> #include <linux/mutex.h> #include <linux/sched.h> #include <linux/uaccess.h> #include <net/9p/9p.h> #include <linux/parser.h> #include <net/9p/client.h> #include <net/9p/transport.h> #include "protocol.h" /* * Client Option Parsing (code inspired by NFS code) * - a little lazy - parse all client options */ enum { Opt_msize, Opt_trans, Opt_legacy, Opt_err, }; static const match_table_t tokens = { {Opt_msize, "msize=%u"}, {Opt_legacy, "noextend"}, {Opt_trans, "trans=%s"}, {Opt_err, NULL}, }; static struct p9_req_t * p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); /** * parse_options - parse mount options into client structure * @opts: options string passed from mount * @clnt: existing v9fs client information * * Return 0 upon success, -ERRNO upon failure */ static int parse_opts(char *opts, struct p9_client *clnt) { char *options, *tmp_options; char *p; substring_t args[MAX_OPT_ARGS]; int option; int ret = 0; clnt->dotu = 1; clnt->msize = 8192; if (!opts) return 0; tmp_options = kstrdup(opts, GFP_KERNEL); if (!tmp_options) { P9_DPRINTK(P9_DEBUG_ERROR, "failed to allocate copy of option string\n"); return -ENOMEM; } options = tmp_options; while ((p = strsep(&options, ",")) != NULL) { int token; if (!*p) continue; token = match_token(p, tokens, args); if (token < Opt_trans) { int r = match_int(&args[0], &option); if (r < 0) { P9_DPRINTK(P9_DEBUG_ERROR, "integer field, but no integer?\n"); ret = r; continue; } } switch (token) { case Opt_msize: clnt->msize = option; break; case Opt_trans: clnt->trans_mod = v9fs_get_trans_by_name(&args[0]); if(clnt->trans_mod == NULL) { P9_DPRINTK(P9_DEBUG_ERROR, "Could not find request transport: %s\n", (char *) &args[0]); ret = -EINVAL; goto free_and_return; } break; case Opt_legacy: clnt->dotu = 0; break; default: continue; } } free_and_return: kfree(tmp_options); return ret; } /** * p9_tag_alloc - lookup/allocate a request by tag * @c: client session to lookup tag within * @tag: numeric id for transaction * * this is a simple array lookup, but will grow the * request_slots as necessary to accomodate transaction * ids which did not previously have a slot. * * this code relies on the client spinlock to manage locks, its * possible we should switch to something else, but I'd rather * stick with something low-overhead for the common case. * */ static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag) { unsigned long flags; int row, col; struct p9_req_t *req; /* This looks up the original request by tag so we know which * buffer to read the data into */ tag++; if (tag >= c->max_tag) { spin_lock_irqsave(&c->lock, flags); /* check again since original check was outside of lock */ while (tag >= c->max_tag) { row = (tag / P9_ROW_MAXTAG); c->reqs[row] = kcalloc(P9_ROW_MAXTAG, sizeof(struct p9_req_t), GFP_ATOMIC); if (!c->reqs[row]) { printk(KERN_ERR "Couldn't grow tag array\n"); spin_unlock_irqrestore(&c->lock, flags); return ERR_PTR(-ENOMEM); } for (col = 0; col < P9_ROW_MAXTAG; col++) { c->reqs[row][col].status = REQ_STATUS_IDLE; c->reqs[row][col].tc = NULL; } c->max_tag += P9_ROW_MAXTAG; } spin_unlock_irqrestore(&c->lock, flags); } row = tag / P9_ROW_MAXTAG; col = tag % P9_ROW_MAXTAG; req = &c->reqs[row][col]; if (!req->tc) { req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL); if (!req->wq) { printk(KERN_ERR "Couldn't grow tag array\n"); return ERR_PTR(-ENOMEM); } init_waitqueue_head(req->wq); req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize, GFP_KERNEL); req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize, GFP_KERNEL); if ((!req->tc) || (!req->rc)) { printk(KERN_ERR "Couldn't grow tag array\n"); kfree(req->tc); kfree(req->rc); kfree(req->wq); req->tc = req->rc = NULL; req->wq = NULL; return ERR_PTR(-ENOMEM); } req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall); req->tc->capacity = c->msize; req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall); req->rc->capacity = c->msize; } p9pdu_reset(req->tc); p9pdu_reset(req->rc); req->tc->tag = tag-1; req->status = REQ_STATUS_ALLOC; return &c->reqs[row][col]; } /** * p9_tag_lookup - lookup a request by tag * @c: client session to lookup tag within * @tag: numeric id for transaction * */ struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) { int row, col; /* This looks up the original request by tag so we know which * buffer to read the data into */ tag++; BUG_ON(tag >= c->max_tag); row = tag / P9_ROW_MAXTAG; col = tag % P9_ROW_MAXTAG; return &c->reqs[row][col]; } EXPORT_SYMBOL(p9_tag_lookup); /** * p9_tag_init - setup tags structure and contents * @c: v9fs client struct * * This initializes the tags structure for each client instance. * */ static int p9_tag_init(struct p9_client *c) { int err = 0; c->tagpool = p9_idpool_create(); if (IS_ERR(c->tagpool)) { err = PTR_ERR(c->tagpool); c->tagpool = NULL; goto error; } p9_idpool_get(c->tagpool); /* reserve tag 0 */ c->max_tag = 0; error: return err; } /** * p9_tag_cleanup - cleans up tags structure and reclaims resources * @c: v9fs client struct * * This frees resources associated with the tags structure * */ static void p9_tag_cleanup(struct p9_client *c) { int row, col; /* check to insure all requests are idle */ for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { for (col = 0; col < P9_ROW_MAXTAG; col++) { if (c->reqs[row][col].status != REQ_STATUS_IDLE) { P9_DPRINTK(P9_DEBUG_MUX, "Attempting to cleanup non-free tag %d,%d\n", row, col); /* TODO: delay execution of cleanup */ return; } } } if (c->tagpool) p9_idpool_destroy(c->tagpool); /* free requests associated with tags */ for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { for (col = 0; col < P9_ROW_MAXTAG; col++) { kfree(c->reqs[row][col].wq); kfree(c->reqs[row][col].tc); kfree(c->reqs[row][col].rc); } kfree(c->reqs[row]); } c->max_tag = 0; } /** * p9_free_req - free a request and clean-up as necessary * c: client state * r: request to release * */ static void p9_free_req(struct p9_client *c, struct p9_req_t *r) { int tag = r->tc->tag; P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); r->status = REQ_STATUS_IDLE; if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) p9_idpool_put(tag, c->tagpool); } /** * p9_client_cb - call back from transport to client * c: client state * req: request received * */ void p9_client_cb(struct p9_client *c, struct p9_req_t *req) { P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); wake_up(req->wq); P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); } EXPORT_SYMBOL(p9_client_cb); /** * p9_parse_header - parse header arguments out of a packet * @pdu: packet to parse * @size: size of packet * @type: type of request * @tag: tag of packet * @rewind: set if we need to rewind offset afterwards */ int p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, int rewind) { int8_t r_type; int16_t r_tag; int32_t r_size; int offset = pdu->offset; int err; pdu->offset = 0; if (pdu->size == 0) pdu->size = 7; err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); if (err) goto rewind_and_exit; pdu->size = r_size; pdu->id = r_type; pdu->tag = r_tag; P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size, pdu->id, pdu->tag); if (type) *type = r_type; if (tag) *tag = r_tag; if (size) *size = r_size; rewind_and_exit: if (rewind) pdu->offset = offset; return err; } EXPORT_SYMBOL(p9_parse_header); /** * p9_check_errors - check 9p packet for error return and process it * @c: current client instance * @req: request to parse and check for error conditions * * returns error code if one is discovered, otherwise returns 0 * * this will have to be more complicated if we have multiple * error packet types */ static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) { int8_t type; int err; err = p9_parse_header(req->rc, NULL, &type, NULL, 0); if (err) { P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); return err; } if (type == P9_RERROR) { int ecode; char *ename; err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode); if (err) { P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); return err; } if (c->dotu) err = -ecode; if (!err || !IS_ERR_VALUE(err)) err = p9_errstr2errno(ename, strlen(ename)); P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename); kfree(ename); } else err = 0; return err; } /** * p9_client_flush - flush (cancel) a request * @c: client state * @oldreq: request to cancel * * This sents a flush for a particular requests and links * the flush request to the original request. The current * code only supports a single flush request although the protocol * allows for multiple flush requests to be sent for a single request. * */ static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) { struct p9_req_t *req; int16_t oldtag; int err; err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); if (err) return err; P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); if (IS_ERR(req)) return PTR_ERR(req); /* if we haven't received a response for oldreq, remove it from the list. */ spin_lock(&c->lock); if (oldreq->status == REQ_STATUS_FLSH) list_del(&oldreq->req_list); spin_unlock(&c->lock); p9_free_req(c, req); return 0; } /** * p9_client_rpc - issue a request and wait for a response * @c: client session * @type: type of request * @fmt: protocol format string (see protocol.c) * * Returns request structure (which client must free using p9_free_req) */ static struct p9_req_t * p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) { va_list ap; int tag, err; struct p9_req_t *req; unsigned long flags; int sigpending; P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type); if (c->status != Connected) return ERR_PTR(-EIO); if (signal_pending(current)) { sigpending = 1; clear_thread_flag(TIF_SIGPENDING); } else sigpending = 0; tag = P9_NOTAG; if (type != P9_TVERSION) { tag = p9_idpool_get(c->tagpool); if (tag < 0) return ERR_PTR(-ENOMEM); } req = p9_tag_alloc(c, tag); if (IS_ERR(req)) return req; /* marshall the data */ p9pdu_prepare(req->tc, tag, type); va_start(ap, fmt); err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap); va_end(ap); p9pdu_finalize(req->tc); err = c->trans_mod->request(c, req); if (err < 0) { c->status = Disconnected; goto reterr; } P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag); err = wait_event_interruptible(*req->wq, req->status >= REQ_STATUS_RCVD); P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n", req->wq, tag, err); if (req->status == REQ_STATUS_ERROR) { P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); err = req->t_err; } if ((err == -ERESTARTSYS) && (c->status == Connected)) { P9_DPRINTK(P9_DEBUG_MUX, "flushing\n"); sigpending = 1; clear_thread_flag(TIF_SIGPENDING); if (c->trans_mod->cancel(c, req)) p9_client_flush(c, req); /* if we received the response anyway, don't signal error */ if (req->status == REQ_STATUS_RCVD) err = 0; } if (sigpending) { spin_lock_irqsave(¤t->sighand->siglock, flags); recalc_sigpending(); spin_unlock_irqrestore(¤t->sighand->siglock, flags); } if (err < 0) goto reterr; err = p9_check_errors(c, req); if (!err) { P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type); return req; } reterr: P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type, err); p9_free_req(c, req); return ERR_PTR(err); } static struct p9_fid *p9_fid_create(struct p9_client *clnt) { int ret; struct p9_fid *fid; unsigned long flags; P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt); fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); if (!fid) return ERR_PTR(-ENOMEM); ret = p9_idpool_get(clnt->fidpool); if (ret < 0) { ret = -ENOSPC; goto error; } fid->fid = ret; memset(&fid->qid, 0, sizeof(struct p9_qid)); fid->mode = -1; fid->uid = current_fsuid(); fid->clnt = clnt; fid->rdir = NULL; spin_lock_irqsave(&clnt->lock, flags); list_add(&fid->flist, &clnt->fidlist); spin_unlock_irqrestore(&clnt->lock, flags); return fid; error: kfree(fid); return ERR_PTR(ret); } static void p9_fid_destroy(struct p9_fid *fid) { struct p9_client *clnt; unsigned long flags; P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid); clnt = fid->clnt; p9_idpool_put(fid->fid, clnt->fidpool); spin_lock_irqsave(&clnt->lock, flags); list_del(&fid->flist); spin_unlock_irqrestore(&clnt->lock, flags); kfree(fid->rdir); kfree(fid); } int p9_client_version(struct p9_client *c) { int err = 0; struct p9_req_t *req; char *version; int msize; P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n", c->msize, c->dotu); req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize, c->dotu ? "9P2000.u" : "9P2000"); if (IS_ERR(req)) return PTR_ERR(req); err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version); if (err) { P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err); p9pdu_dump(1, req->rc); goto error; } P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); if (!memcmp(version, "9P2000.u", 8)) c->dotu = 1; else if (!memcmp(version, "9P2000", 6)) c->dotu = 0; else { err = -EREMOTEIO; goto error; } if (msize < c->msize) c->msize = msize; error: kfree(version); p9_free_req(c, req); return err; } EXPORT_SYMBOL(p9_client_version); struct p9_client *p9_client_create(const char *dev_name, char *options) { int err; struct p9_client *clnt; err = 0; clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); if (!clnt) return ERR_PTR(-ENOMEM); clnt->trans_mod = NULL; clnt->trans = NULL; spin_lock_init(&clnt->lock); INIT_LIST_HEAD(&clnt->fidlist); p9_tag_init(clnt); err = parse_opts(options, clnt); if (err < 0) goto free_client; if (!clnt->trans_mod) clnt->trans_mod = v9fs_get_default_trans(); if (clnt->trans_mod == NULL) { err = -EPROTONOSUPPORT; P9_DPRINTK(P9_DEBUG_ERROR, "No transport defined or default transport\n"); goto free_client; } clnt->fidpool = p9_idpool_create(); if (IS_ERR(clnt->fidpool)) { err = PTR_ERR(clnt->fidpool); clnt->fidpool = NULL; goto put_trans; } P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n", clnt, clnt->trans_mod, clnt->msize, clnt->dotu); err = clnt->trans_mod->create(clnt, dev_name, options); if (err) goto destroy_fidpool; if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; err = p9_client_version(clnt); if (err) goto close_trans; return clnt; close_trans: clnt->trans_mod->close(clnt); destroy_fidpool: p9_idpool_destroy(clnt->fidpool); put_trans: v9fs_put_trans(clnt->trans_mod); free_client: kfree(clnt); return ERR_PTR(err); } EXPORT_SYMBOL(p9_client_create); void p9_client_destroy(struct p9_client *clnt) { struct p9_fid *fid, *fidptr; P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt); if (clnt->trans_mod) clnt->trans_mod->close(clnt); v9fs_put_trans(clnt->trans_mod); list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) p9_fid_destroy(fid); if (clnt->fidpool) p9_idpool_destroy(clnt->fidpool); p9_tag_cleanup(clnt); kfree(clnt); } EXPORT_SYMBOL(p9_client_destroy); void p9_client_disconnect(struct p9_client *clnt) { P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); clnt->status = Disconnected; } EXPORT_SYMBOL(p9_client_disconnect); struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, char *uname, u32 n_uname, char *aname) { int err; struct p9_req_t *req; struct p9_fid *fid; struct p9_qid qid; P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", afid ? afid->fid : -1, uname, aname); err = 0; fid = p9_fid_create(clnt); if (IS_ERR(fid)) { err = PTR_ERR(fid); fid = NULL; goto error; } req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, afid ? afid->fid : P9_NOFID, uname, aname, n_uname); if (IS_ERR(req)) { err = PTR_ERR(req); goto error; } err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid); if (err) { p9pdu_dump(1, req->rc); p9_free_req(clnt, req); goto error; } P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", qid.type, (unsigned long long)qid.path, qid.version); memmove(&fid->qid, &qid, sizeof(struct p9_qid)); p9_free_req(clnt, req); return fid; error: if (fid) p9_fid_destroy(fid); return ERR_PTR(err); } EXPORT_SYMBOL(p9_client_attach); struct p9_fid * p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname) { int err; struct p9_req_t *req; struct p9_qid qid; struct p9_fid *afid; P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname); err = 0; afid = p9_fid_create(clnt); if (IS_ERR(afid)) { err = PTR_ERR(afid); afid = NULL; goto error; } req = p9_client_rpc(clnt, P9_TAUTH, "dss?d", afid ? afid->fid : P9_NOFID, uname, aname, n_uname); if (IS_ERR(req)) { err = PTR_ERR(req); goto error; } err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid); if (err) { p9pdu_dump(1, req->rc); p9_free_req(clnt, req); goto error; } P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n", qid.type, (unsigned long long)qid.path, qid.version); memmove(&afid->qid, &qid, sizeof(struct p9_qid)); p9_free_req(clnt, req); return afid; error: if (afid) p9_fid_destroy(afid); return ERR_PTR(err); } EXPORT_SYMBOL(p9_client_auth); struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, int clone) { int err; struct p9_client *clnt; struct p9_fid *fid; struct p9_qid *wqids; struct p9_req_t *req; int16_t nwqids, count; err = 0; clnt = oldfid->clnt; if (clone) { fid = p9_fid_create(clnt); if (IS_ERR(fid)) { err = PTR_ERR(fid); fid = NULL; goto error; } fid->uid = oldfid->uid; } else fid = oldfid; P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n", oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, nwname, wnames); if (IS_ERR(req)) { err = PTR_ERR(req); goto error; } err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids); if (err) { p9pdu_dump(1, req->rc); p9_free_req(clnt, req); goto clunk_fid; } p9_free_req(clnt, req); P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); if (nwqids != nwname) { err = -ENOENT; goto clunk_fid; } for (count = 0; count < nwqids; count++) P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", count, wqids[count].type, (unsigned long long)wqids[count].path, wqids[count].version); if (nwname) memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); else fid->qid = oldfid->qid; return fid; clunk_fid: p9_client_clunk(fid); fid = NULL; error: if (fid && (fid != oldfid)) p9_fid_destroy(fid); return ERR_PTR(err); } EXPORT_SYMBOL(p9_client_walk); int p9_client_open(struct p9_fid *fid, int mode) { int err; struct p9_client *clnt; struct p9_req_t *req; struct p9_qid qid; int iounit; P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode); err = 0; clnt = fid->clnt; if (fid->mode != -1) return -EINVAL; req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); if (IS_ERR(req)) { err = PTR_ERR(req); goto error; } err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit); if (err) { p9pdu_dump(1, req->rc); goto free_and_error; } P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n", qid.type, (unsigned long long)qid.path, qid.version, iounit); fid->mode = mode; fid->iounit = iounit; free_and_error: p9_free_req(clnt, req); error: return err; } EXPORT_SYMBOL(p9_client_open); int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, char *extension) { int err; struct p9_client *clnt; struct p9_req_t *req; struct p9_qid qid; int iounit; P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", fid->fid, name, perm, mode); err = 0; clnt = fid->clnt; if (fid->mode != -1) return -EINVAL; req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, mode, extension); if (IS_ERR(req)) { err = PTR_ERR(req); goto error; } err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit); if (err) { p9pdu_dump(1, req->rc); goto free_and_error; } P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", qid.type, (unsigned long long)qid.path, qid.version, iounit); fid->mode = mode; fid->iounit = iounit; free_and_error: p9_free_req(clnt, req); error: return err; } EXPORT_SYMBOL(p9_client_fcreate); int p9_client_clunk(struct p9_fid *fid) { int err; struct p9_client *clnt; struct p9_req_t *req; P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid); err = 0; clnt = fid->clnt; req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); if (IS_ERR(req)) { err = PTR_ERR(req); goto error; } P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); p9_free_req(clnt, req); p9_fid_destroy(fid); error: return err; } EXPORT_SYMBOL(p9_client_clunk); int p9_client_remove(struct p9_fid *fid) { int err; struct p9_client *clnt; struct p9_req_t *req; P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); err = 0; clnt = fid->clnt; req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); if (IS_ERR(req)) { err = PTR_ERR(req); goto error; } P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); p9_free_req(clnt, req); p9_fid_destroy(fid); error: return err; } EXPORT_SYMBOL(p9_client_remove); int p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, u32 count) { int err, rsize, total; struct p9_client *clnt; struct p9_req_t *req; char *dataptr; P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid, (long long unsigned) offset, count); err = 0; clnt = fid->clnt; total = 0; rsize = fid->iounit; if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) rsize = clnt->msize - P9_IOHDRSZ; if (count < rsize) rsize = count; req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize); if (IS_ERR(req)) { err = PTR_ERR(req); goto error; } err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr); if (err) { p9pdu_dump(1, req->rc); goto free_and_error; } P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count); if (data) { memmove(data, dataptr, count); } if (udata) { err = copy_to_user(udata, dataptr, count); if (err) { err = -EFAULT; goto free_and_error; } } p9_free_req(clnt, req); return count; free_and_error: p9_free_req(clnt, req); error: return err; } EXPORT_SYMBOL(p9_client_read); int p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, u64 offset, u32 count) { int err, rsize, total; struct p9_client *clnt; struct p9_req_t *req; P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", fid->fid, (long long unsigned) offset, count); err = 0; clnt = fid->clnt; total = 0; rsize = fid->iounit; if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) rsize = clnt->msize - P9_IOHDRSZ; if (count < rsize) rsize = count; if (data) req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset, rsize, data); else req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset, rsize, udata); if (IS_ERR(req)) { err = PTR_ERR(req); goto error; } err = p9pdu_readf(req->rc, clnt->dotu, "d", &count); if (err) { p9pdu_dump(1, req->rc); goto free_and_error; } P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); p9_free_req(clnt, req); return count; free_and_error: p9_free_req(clnt, req); error: return err; } EXPORT_SYMBOL(p9_client_write); struct p9_wstat *p9_client_stat(struct p9_fid *fid) { int err; struct p9_client *clnt; struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); struct p9_req_t *req; u16 ignored; P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); if (!ret) return ERR_PTR(-ENOMEM); err = 0; clnt = fid->clnt; req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); if (IS_ERR(req)) { err = PTR_ERR(req); goto error; } err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret); if (err) { p9pdu_dump(1, req->rc); p9_free_req(clnt, req); goto error; } P9_DPRINTK(P9_DEBUG_9P, "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" "<<< uid=%d gid=%d n_muid=%d\n", ret->size, ret->type, ret->dev, ret->qid.type, (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, ret->atime, ret->mtime, (unsigned long long)ret->length, ret->name, ret->uid, ret->gid, ret->muid, ret->extension, ret->n_uid, ret->n_gid, ret->n_muid); p9_free_req(clnt, req); return ret; error: kfree(ret); return ERR_PTR(err); } EXPORT_SYMBOL(p9_client_stat); static int p9_client_statsize(struct p9_wstat *wst, int optional) { int ret; /* NOTE: size shouldn't include its own length */ /* size[2] type[2] dev[4] qid[13] */ /* mode[4] atime[4] mtime[4] length[8]*/ /* name[s] uid[s] gid[s] muid[s] */ ret = 2+4+13+4+4+4+8+2+2+2+2; if (wst->name) ret += strlen(wst->name); if (wst->uid) ret += strlen(wst->uid); if (wst->gid) ret += strlen(wst->gid); if (wst->muid) ret += strlen(wst->muid); if (optional) { ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ if (wst->extension) ret += strlen(wst->extension); } return ret; } int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) { int err; struct p9_req_t *req; struct p9_client *clnt; err = 0; clnt = fid->clnt; wst->size = p9_client_statsize(wst, clnt->dotu); P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); P9_DPRINTK(P9_DEBUG_9P, " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" " uid=%d gid=%d n_muid=%d\n", wst->size, wst->type, wst->dev, wst->qid.type, (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, wst->atime, wst->mtime, (unsigned long long)wst->length, wst->name, wst->uid, wst->gid, wst->muid, wst->extension, wst->n_uid, wst->n_gid, wst->n_muid); req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); if (IS_ERR(req)) { err = PTR_ERR(req); goto error; } P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); p9_free_req(clnt, req); error: return err; } EXPORT_SYMBOL(p9_client_wstat);