diff options
Diffstat (limited to 'net/9p/client.c')
| -rw-r--r-- | net/9p/client.c | 1286 |
1 files changed, 1286 insertions, 0 deletions
diff --git a/net/9p/client.c b/net/9p/client.c new file mode 100644 index 0000000..4b52945 --- /dev/null +++ b/net/9p/client.c @@ -0,0 +1,1286 @@ +/* + * 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, ...); + +/** + * v9fs_parse_options - parse mount options into session structure + * @options: options string passed from mount + * @v9ses: existing v9fs session information + * + * Return 0 upon success, -ERRNO upon failure + */ + +static int parse_opts(char *opts, struct p9_client *clnt) +{ + char *options; + char *p; + substring_t args[MAX_OPT_ARGS]; + int option; + int ret = 0; + + clnt->dotu = 1; + clnt->msize = 8192; + + if (!opts) + return 0; + + options = kstrdup(opts, GFP_KERNEL); + if (!options) { + P9_DPRINTK(P9_DEBUG_ERROR, + "failed to allocate copy of option string\n"); + return -ENOMEM; + } + + 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]); + break; + case Opt_legacy: + clnt->dotu = 0; + break; + default: + continue; + } + } + + if (!clnt->trans_mod) + clnt->trans_mod = v9fs_get_default_trans(); + + kfree(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->flush_tag = 0; + 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 + * @tags: tags structure from the 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 + * @tags: tags structure from the 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) +{ + struct p9_req_t *other_req; + unsigned long flags; + + P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); + + if (req->status == REQ_STATUS_ERROR) + wake_up(req->wq); + + if (req->flush_tag) { /* flush receive path */ + P9_DPRINTK(P9_DEBUG_9P, "<<< RFLUSH %d\n", req->tc->tag); + spin_lock_irqsave(&c->lock, flags); + other_req = p9_tag_lookup(c, req->flush_tag); + if (other_req->status != REQ_STATUS_FLSH) /* stale flush */ + spin_unlock_irqrestore(&c->lock, flags); + else { + other_req->status = REQ_STATUS_FLSHD; + spin_unlock_irqrestore(&c->lock, flags); + wake_up(other_req->wq); + } + p9_free_req(c, req); + } else { /* normal receive path */ + P9_DPRINTK(P9_DEBUG_MUX, "normal: tag %d\n", req->tc->tag); + spin_lock_irqsave(&c->lock, flags); + if (req->status != REQ_STATUS_FLSHD) + req->status = REQ_STATUS_RCVD; + spin_unlock_irqrestore(&c->lock, flags); + 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) { + err = p9_errstr2errno(ename, strlen(ename)); + + /* string match failed */ + if (!err) + err = -ESERVERFAULT; + } + + 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 + * req: 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); + + req->flush_tag = oldtag; + + /* we don't free anything here because RPC isn't complete */ + 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; + int flushed = 0; + + 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; + } + + /* if it was a flush we just transmitted, return our tag */ + if (type == P9_TFLUSH) + return req; +again: + 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 (flushed=%d)\n", + req->wq, tag, err, flushed); + + if (req->status == REQ_STATUS_ERROR) { + P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); + err = req->t_err; + } else if (err == -ERESTARTSYS && flushed) { + P9_DPRINTK(P9_DEBUG_MUX, "flushed - going again\n"); + goto again; + } else if (req->status == REQ_STATUS_FLSHD) { + P9_DPRINTK(P9_DEBUG_MUX, "flushed - erestartsys\n"); + err = -ERESTARTSYS; + } + + if ((err == -ERESTARTSYS) && (c->status == Connected) && (!flushed)) { + P9_DPRINTK(P9_DEBUG_MUX, "flushing\n"); + spin_lock_irqsave(&c->lock, flags); + if (req->status == REQ_STATUS_SENT) + req->status = REQ_STATUS_FLSH; + spin_unlock_irqrestore(&c->lock, flags); + sigpending = 1; + flushed = 1; + clear_thread_flag(TIF_SIGPENDING); + + if (c->trans_mod->cancel(c, req)) { + err = p9_client_flush(c, req); + if (err == 0) + goto again; + } + } + + 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 (fid->fid < 0) { + ret = -ENOSPC; + goto error; + } + fid->fid = ret; + + memset(&fid->qid, 0, sizeof(struct p9_qid)); + fid->mode = -1; + fid->rdir_fpos = 0; + fid->uid = current->fsuid; + fid->clnt = clnt; + fid->aux = 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); +} + +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); + clnt->fidpool = p9_idpool_create(); + if (IS_ERR(clnt->fidpool)) { + err = PTR_ERR(clnt->fidpool); + clnt->fidpool = NULL; + goto error; + } + + p9_tag_init(clnt); + + err = parse_opts(options, clnt); + if (err < 0) + goto error; + + if (clnt->trans_mod == NULL) { + err = -EPROTONOSUPPORT; + P9_DPRINTK(P9_DEBUG_ERROR, + "No transport defined or default transport\n"); + goto error; + } + + 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 error; + + 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 error; + + return clnt; + +error: + p9_client_destroy(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); + data += 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) { + ret = ERR_PTR(err); + p9pdu_dump(1, req->rc); + goto free_and_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); + +free_and_error: + p9_free_req(clnt, req); +error: + return ret; +} +EXPORT_SYMBOL(p9_client_stat); + +int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) +{ + int err; + struct p9_req_t *req; + struct p9_client *clnt; + + 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); + err = 0; + clnt = fid->clnt; + + req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, 0, 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); |
