| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * 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> |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #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/slab.h> |
| #include <linux/sched/signal.h> |
| #include <linux/uaccess.h> |
| #include <linux/uio.h> |
| #include <net/9p/9p.h> |
| #include <linux/parser.h> |
| #include <linux/seq_file.h> |
| #include <net/9p/client.h> |
| #include <net/9p/transport.h> |
| #include "protocol.h" |
| |
| #define CREATE_TRACE_POINTS |
| #include <trace/events/9p.h> |
| |
| #define DEFAULT_MSIZE (128 * 1024) |
| |
| /* Client Option Parsing (code inspired by NFS code) |
| * - a little lazy - parse all client options |
| */ |
| |
| enum { |
| Opt_msize, |
| Opt_trans, |
| Opt_legacy, |
| Opt_version, |
| Opt_err, |
| }; |
| |
| static const match_table_t tokens = { |
| {Opt_msize, "msize=%u"}, |
| {Opt_legacy, "noextend"}, |
| {Opt_trans, "trans=%s"}, |
| {Opt_version, "version=%s"}, |
| {Opt_err, NULL}, |
| }; |
| |
| inline int p9_is_proto_dotl(struct p9_client *clnt) |
| { |
| return clnt->proto_version == p9_proto_2000L; |
| } |
| EXPORT_SYMBOL(p9_is_proto_dotl); |
| |
| inline int p9_is_proto_dotu(struct p9_client *clnt) |
| { |
| return clnt->proto_version == p9_proto_2000u; |
| } |
| EXPORT_SYMBOL(p9_is_proto_dotu); |
| |
| int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) |
| { |
| if (clnt->msize != DEFAULT_MSIZE) |
| seq_printf(m, ",msize=%u", clnt->msize); |
| seq_printf(m, ",trans=%s", clnt->trans_mod->name); |
| |
| switch (clnt->proto_version) { |
| case p9_proto_legacy: |
| seq_puts(m, ",noextend"); |
| break; |
| case p9_proto_2000u: |
| seq_puts(m, ",version=9p2000.u"); |
| break; |
| case p9_proto_2000L: |
| /* Default */ |
| break; |
| } |
| |
| if (clnt->trans_mod->show_options) |
| return clnt->trans_mod->show_options(m, clnt); |
| return 0; |
| } |
| EXPORT_SYMBOL(p9_show_client_options); |
| |
| /* Some error codes are taken directly from the server replies, |
| * make sure they are valid. |
| */ |
| static int safe_errno(int err) |
| { |
| if (err > 0 || err < -MAX_ERRNO) { |
| p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); |
| return -EPROTO; |
| } |
| return err; |
| } |
| |
| /* Interpret mount option for protocol version */ |
| static int get_protocol_version(char *s) |
| { |
| int version = -EINVAL; |
| |
| if (!strcmp(s, "9p2000")) { |
| version = p9_proto_legacy; |
| p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); |
| } else if (!strcmp(s, "9p2000.u")) { |
| version = p9_proto_2000u; |
| p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); |
| } else if (!strcmp(s, "9p2000.L")) { |
| version = p9_proto_2000L; |
| p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); |
| } else { |
| pr_info("Unknown protocol version %s\n", s); |
| } |
| |
| return version; |
| } |
| |
| /** |
| * parse_opts - 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; |
| char *s; |
| int ret = 0; |
| |
| clnt->proto_version = p9_proto_2000L; |
| clnt->msize = DEFAULT_MSIZE; |
| |
| if (!opts) |
| return 0; |
| |
| tmp_options = kstrdup(opts, GFP_KERNEL); |
| if (!tmp_options) |
| return -ENOMEM; |
| options = tmp_options; |
| |
| while ((p = strsep(&options, ",")) != NULL) { |
| int token, r; |
| |
| if (!*p) |
| continue; |
| token = match_token(p, tokens, args); |
| switch (token) { |
| case Opt_msize: |
| r = match_int(&args[0], &option); |
| if (r < 0) { |
| p9_debug(P9_DEBUG_ERROR, |
| "integer field, but no integer?\n"); |
| ret = r; |
| continue; |
| } |
| if (option < 4096) { |
| p9_debug(P9_DEBUG_ERROR, |
| "msize should be at least 4k\n"); |
| ret = -EINVAL; |
| continue; |
| } |
| clnt->msize = option; |
| break; |
| case Opt_trans: |
| s = match_strdup(&args[0]); |
| if (!s) { |
| ret = -ENOMEM; |
| p9_debug(P9_DEBUG_ERROR, |
| "problem allocating copy of trans arg\n"); |
| goto free_and_return; |
| } |
| |
| v9fs_put_trans(clnt->trans_mod); |
| clnt->trans_mod = v9fs_get_trans_by_name(s); |
| if (!clnt->trans_mod) { |
| pr_info("Could not find request transport: %s\n", |
| s); |
| ret = -EINVAL; |
| } |
| kfree(s); |
| break; |
| case Opt_legacy: |
| clnt->proto_version = p9_proto_legacy; |
| break; |
| case Opt_version: |
| s = match_strdup(&args[0]); |
| if (!s) { |
| ret = -ENOMEM; |
| p9_debug(P9_DEBUG_ERROR, |
| "problem allocating copy of version arg\n"); |
| goto free_and_return; |
| } |
| r = get_protocol_version(s); |
| if (r < 0) |
| ret = r; |
| else |
| clnt->proto_version = r; |
| kfree(s); |
| break; |
| default: |
| continue; |
| } |
| } |
| |
| free_and_return: |
| if (ret) |
| v9fs_put_trans(clnt->trans_mod); |
| kfree(tmp_options); |
| return ret; |
| } |
| |
| static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, |
| int alloc_msize) |
| { |
| if (likely(c->fcall_cache) && alloc_msize == c->msize) { |
| fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); |
| fc->cache = c->fcall_cache; |
| } else { |
| fc->sdata = kmalloc(alloc_msize, GFP_NOFS); |
| fc->cache = NULL; |
| } |
| if (!fc->sdata) |
| return -ENOMEM; |
| fc->capacity = alloc_msize; |
| return 0; |
| } |
| |
| void p9_fcall_fini(struct p9_fcall *fc) |
| { |
| /* sdata can be NULL for interrupted requests in trans_rdma, |
| * and kmem_cache_free does not do NULL-check for us |
| */ |
| if (unlikely(!fc->sdata)) |
| return; |
| |
| if (fc->cache) |
| kmem_cache_free(fc->cache, fc->sdata); |
| else |
| kfree(fc->sdata); |
| } |
| EXPORT_SYMBOL(p9_fcall_fini); |
| |
| static struct kmem_cache *p9_req_cache; |
| |
| /** |
| * p9_tag_alloc - Allocate a new request. |
| * @c: Client session. |
| * @type: Transaction type. |
| * @max_size: Maximum packet size for this request. |
| * |
| * Context: Process context. |
| * Return: Pointer to new request. |
| */ |
| static struct p9_req_t * |
| p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size) |
| { |
| struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); |
| int alloc_msize = min(c->msize, max_size); |
| int tag; |
| |
| if (!req) |
| return ERR_PTR(-ENOMEM); |
| |
| if (p9_fcall_init(c, &req->tc, alloc_msize)) |
| goto free_req; |
| if (p9_fcall_init(c, &req->rc, alloc_msize)) |
| goto free; |
| |
| p9pdu_reset(&req->tc); |
| p9pdu_reset(&req->rc); |
| req->t_err = 0; |
| req->status = REQ_STATUS_ALLOC; |
| /* refcount needs to be set to 0 before inserting into the idr |
| * so p9_tag_lookup does not accept a request that is not fully |
| * initialized. refcount_set to 2 below will mark request ready. |
| */ |
| refcount_set(&req->refcount, 0); |
| init_waitqueue_head(&req->wq); |
| INIT_LIST_HEAD(&req->req_list); |
| |
| idr_preload(GFP_NOFS); |
| spin_lock_irq(&c->lock); |
| if (type == P9_TVERSION) |
| tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, |
| GFP_NOWAIT); |
| else |
| tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); |
| req->tc.tag = tag; |
| spin_unlock_irq(&c->lock); |
| idr_preload_end(); |
| if (tag < 0) |
| goto free; |
| |
| /* Init ref to two because in the general case there is one ref |
| * that is put asynchronously by a writer thread, one ref |
| * temporarily given by p9_tag_lookup and put by p9_client_cb |
| * in the recv thread, and one ref put by p9_tag_remove in the |
| * main thread. The only exception is virtio that does not use |
| * p9_tag_lookup but does not have a writer thread either |
| * (the write happens synchronously in the request/zc_request |
| * callback), so p9_client_cb eats the second ref there |
| * as the pointer is duplicated directly by virtqueue_add_sgs() |
| */ |
| refcount_set(&req->refcount, 2); |
| |
| return req; |
| |
| free: |
| p9_fcall_fini(&req->tc); |
| p9_fcall_fini(&req->rc); |
| free_req: |
| kmem_cache_free(p9_req_cache, req); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| /** |
| * p9_tag_lookup - Look up a request by tag. |
| * @c: Client session. |
| * @tag: Transaction ID. |
| * |
| * Context: Any context. |
| * Return: A request, or %NULL if there is no request with that tag. |
| */ |
| struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) |
| { |
| struct p9_req_t *req; |
| |
| rcu_read_lock(); |
| again: |
| req = idr_find(&c->reqs, tag); |
| if (req) { |
| /* We have to be careful with the req found under rcu_read_lock |
| * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the |
| * ref again without corrupting other data, then check again |
| * that the tag matches once we have the ref |
| */ |
| if (!p9_req_try_get(req)) |
| goto again; |
| if (req->tc.tag != tag) { |
| p9_req_put(c, req); |
| goto again; |
| } |
| } |
| rcu_read_unlock(); |
| |
| return req; |
| } |
| EXPORT_SYMBOL(p9_tag_lookup); |
| |
| /** |
| * p9_tag_remove - Remove a tag. |
| * @c: Client session. |
| * @r: Request of reference. |
| * |
| * Context: Any context. |
| */ |
| static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r) |
| { |
| unsigned long flags; |
| u16 tag = r->tc.tag; |
| |
| p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); |
| spin_lock_irqsave(&c->lock, flags); |
| idr_remove(&c->reqs, tag); |
| spin_unlock_irqrestore(&c->lock, flags); |
| return p9_req_put(c, r); |
| } |
| |
| int p9_req_put(struct p9_client *c, struct p9_req_t *r) |
| { |
| if (refcount_dec_and_test(&r->refcount)) { |
| p9_fcall_fini(&r->tc); |
| p9_fcall_fini(&r->rc); |
| kmem_cache_free(p9_req_cache, r); |
| return 1; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL(p9_req_put); |
| |
| /** |
| * 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) |
| { |
| struct p9_req_t *req; |
| int id; |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&c->reqs, req, id) { |
| pr_info("Tag %d still in use\n", id); |
| if (p9_tag_remove(c, req) == 0) |
| pr_warn("Packet with tag %d has still references", |
| req->tc.tag); |
| } |
| rcu_read_unlock(); |
| } |
| |
| /** |
| * p9_client_cb - call back from transport to client |
| * @c: client state |
| * @req: request received |
| * @status: request status, one of REQ_STATUS_* |
| * |
| */ |
| void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) |
| { |
| p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); |
| |
| /* This barrier is needed to make sure any change made to req before |
| * the status change is visible to another thread |
| */ |
| smp_wmb(); |
| req->status = status; |
| |
| wake_up(&req->wq); |
| p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); |
| p9_req_put(c, req); |
| } |
| 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) |
| { |
| s8 r_type; |
| s16 r_tag; |
| s32 r_size; |
| int offset = pdu->offset; |
| int err; |
| |
| pdu->offset = 0; |
| |
| err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); |
| if (err) |
| goto rewind_and_exit; |
| |
| if (type) |
| *type = r_type; |
| if (tag) |
| *tag = r_tag; |
| if (size) |
| *size = r_size; |
| |
| if (pdu->size != r_size || r_size < 7) { |
| err = -EINVAL; |
| goto rewind_and_exit; |
| } |
| |
| pdu->id = r_type; |
| pdu->tag = r_tag; |
| |
| p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", |
| pdu->size, pdu->id, pdu->tag); |
| |
| 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) |
| { |
| s8 type; |
| int err; |
| int ecode; |
| |
| err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); |
| if (req->rc.size >= c->msize) { |
| p9_debug(P9_DEBUG_ERROR, |
| "requested packet size too big: %d\n", |
| req->rc.size); |
| return -EIO; |
| } |
| /* dump the response from server |
| * This should be after check errors which poplulate pdu_fcall. |
| */ |
| trace_9p_protocol_dump(c, &req->rc); |
| if (err) { |
| p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); |
| return err; |
| } |
| if (type != P9_RERROR && type != P9_RLERROR) |
| return 0; |
| |
| if (!p9_is_proto_dotl(c)) { |
| char *ename; |
| |
| err = p9pdu_readf(&req->rc, c->proto_version, "s?d", |
| &ename, &ecode); |
| if (err) |
| goto out_err; |
| |
| if (p9_is_proto_dotu(c) && ecode < 512) |
| err = -ecode; |
| |
| if (!err) { |
| err = p9_errstr2errno(ename, strlen(ename)); |
| |
| p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", |
| -ecode, ename); |
| } |
| kfree(ename); |
| } else { |
| err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); |
| if (err) |
| goto out_err; |
| err = -ecode; |
| |
| p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); |
| } |
| |
| return err; |
| |
| out_err: |
| p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); |
| |
| return err; |
| } |
| |
| /** |
| * p9_check_zc_errors - check 9p packet for error return and process it |
| * @c: current client instance |
| * @req: request to parse and check for error conditions |
| * @uidata: external buffer containing error |
| * @in_hdrlen: Size of response protocol buffer. |
| * |
| * 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_zc_errors(struct p9_client *c, struct p9_req_t *req, |
| struct iov_iter *uidata, int in_hdrlen) |
| { |
| int err; |
| int ecode; |
| s8 type; |
| char *ename = NULL; |
| |
| err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); |
| /* dump the response from server |
| * This should be after parse_header which poplulate pdu_fcall. |
| */ |
| trace_9p_protocol_dump(c, &req->rc); |
| if (err) { |
| p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); |
| return err; |
| } |
| |
| if (type != P9_RERROR && type != P9_RLERROR) |
| return 0; |
| |
| if (!p9_is_proto_dotl(c)) { |
| /* Error is reported in string format */ |
| int len; |
| /* 7 = header size for RERROR; */ |
| int inline_len = in_hdrlen - 7; |
| |
| len = req->rc.size - req->rc.offset; |
| if (len > (P9_ZC_HDR_SZ - 7)) { |
| err = -EFAULT; |
| goto out_err; |
| } |
| |
| ename = &req->rc.sdata[req->rc.offset]; |
| if (len > inline_len) { |
| /* We have error in external buffer */ |
| if (!copy_from_iter_full(ename + inline_len, |
| len - inline_len, uidata)) { |
| err = -EFAULT; |
| goto out_err; |
| } |
| } |
| ename = NULL; |
| err = p9pdu_readf(&req->rc, c->proto_version, "s?d", |
| &ename, &ecode); |
| if (err) |
| goto out_err; |
| |
| if (p9_is_proto_dotu(c) && ecode < 512) |
| err = -ecode; |
| |
| if (!err) { |
| err = p9_errstr2errno(ename, strlen(ename)); |
| |
| p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", |
| -ecode, ename); |
| } |
| kfree(ename); |
| } else { |
| err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); |
| err = -ecode; |
| |
| p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); |
| } |
| return err; |
| |
| out_err: |
| p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); |
| return err; |
| } |
| |
| static struct p9_req_t * |
| p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); |
| |
| /** |
| * p9_client_flush - flush (cancel) a request |
| * @c: client state |
| * @oldreq: request to cancel |
| * |
| * This sents a flush for a particular request 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; |
| s16 oldtag; |
| int err; |
| |
| err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); |
| if (err) |
| return err; |
| |
| p9_debug(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 |
| */ |
| if (oldreq->status == REQ_STATUS_SENT) { |
| if (c->trans_mod->cancelled) |
| c->trans_mod->cancelled(c, oldreq); |
| } |
| |
| p9_tag_remove(c, req); |
| return 0; |
| } |
| |
| static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, |
| int8_t type, int req_size, |
| const char *fmt, va_list ap) |
| { |
| int err; |
| struct p9_req_t *req; |
| |
| p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); |
| |
| /* we allow for any status other than disconnected */ |
| if (c->status == Disconnected) |
| return ERR_PTR(-EIO); |
| |
| /* if status is begin_disconnected we allow only clunk request */ |
| if (c->status == BeginDisconnect && type != P9_TCLUNK) |
| return ERR_PTR(-EIO); |
| |
| req = p9_tag_alloc(c, type, req_size); |
| if (IS_ERR(req)) |
| return req; |
| |
| /* marshall the data */ |
| p9pdu_prepare(&req->tc, req->tc.tag, type); |
| err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); |
| if (err) |
| goto reterr; |
| p9pdu_finalize(c, &req->tc); |
| trace_9p_client_req(c, type, req->tc.tag); |
| return req; |
| reterr: |
| p9_tag_remove(c, req); |
| /* We have to put also the 2nd reference as it won't be used */ |
| p9_req_put(c, req); |
| return ERR_PTR(err); |
| } |
| |
| /** |
| * 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_tag_remove) |
| */ |
| |
| static struct p9_req_t * |
| p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) |
| { |
| va_list ap; |
| int sigpending, err; |
| unsigned long flags; |
| struct p9_req_t *req; |
| |
| va_start(ap, fmt); |
| req = p9_client_prepare_req(c, type, c->msize, fmt, ap); |
| va_end(ap); |
| if (IS_ERR(req)) |
| return req; |
| |
| if (signal_pending(current)) { |
| sigpending = 1; |
| clear_thread_flag(TIF_SIGPENDING); |
| } else { |
| sigpending = 0; |
| } |
| |
| err = c->trans_mod->request(c, req); |
| if (err < 0) { |
| /* write won't happen */ |
| p9_req_put(c, req); |
| if (err != -ERESTARTSYS && err != -EFAULT) |
| c->status = Disconnected; |
| goto recalc_sigpending; |
| } |
| again: |
| /* Wait for the response */ |
| err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); |
| |
| /* Make sure our req is coherent with regard to updates in other |
| * threads - echoes to wmb() in the callback |
| */ |
| smp_rmb(); |
| |
| if (err == -ERESTARTSYS && c->status == Connected && |
| type == P9_TFLUSH) { |
| sigpending = 1; |
| clear_thread_flag(TIF_SIGPENDING); |
| goto again; |
| } |
| |
| if (req->status == REQ_STATUS_ERROR) { |
| p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
| err = req->t_err; |
| } |
| if (err == -ERESTARTSYS && c->status == Connected) { |
| p9_debug(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; |
| } |
| recalc_sigpending: |
| 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); |
| trace_9p_client_res(c, type, req->rc.tag, err); |
| if (!err) |
| return req; |
| reterr: |
| p9_tag_remove(c, req); |
| return ERR_PTR(safe_errno(err)); |
| } |
| |
| /** |
| * p9_client_zc_rpc - issue a request and wait for a response |
| * @c: client session |
| * @type: type of request |
| * @uidata: destination for zero copy read |
| * @uodata: source for zero copy write |
| * @inlen: read buffer size |
| * @olen: write buffer size |
| * @in_hdrlen: reader header size, This is the size of response protocol data |
| * @fmt: protocol format string (see protocol.c) |
| * |
| * Returns request structure (which client must free using p9_tag_remove) |
| */ |
| static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, |
| struct iov_iter *uidata, |
| struct iov_iter *uodata, |
| int inlen, int olen, int in_hdrlen, |
| const char *fmt, ...) |
| { |
| va_list ap; |
| int sigpending, err; |
| unsigned long flags; |
| struct p9_req_t *req; |
| |
| va_start(ap, fmt); |
| /* We allocate a inline protocol data of only 4k bytes. |
| * The actual content is passed in zero-copy fashion. |
| */ |
| req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); |
| va_end(ap); |
| if (IS_ERR(req)) |
| return req; |
| |
| if (signal_pending(current)) { |
| sigpending = 1; |
| clear_thread_flag(TIF_SIGPENDING); |
| } else { |
| sigpending = 0; |
| } |
| |
| err = c->trans_mod->zc_request(c, req, uidata, uodata, |
| inlen, olen, in_hdrlen); |
| if (err < 0) { |
| if (err == -EIO) |
| c->status = Disconnected; |
| if (err != -ERESTARTSYS) |
| goto recalc_sigpending; |
| } |
| if (req->status == REQ_STATUS_ERROR) { |
| p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
| err = req->t_err; |
| } |
| if (err == -ERESTARTSYS && c->status == Connected) { |
| p9_debug(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; |
| } |
| recalc_sigpending: |
| 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_zc_errors(c, req, uidata, in_hdrlen); |
| trace_9p_client_res(c, type, req->rc.tag, err); |
| if (!err) |
| return req; |
| reterr: |
| p9_tag_remove(c, req); |
| return ERR_PTR(safe_errno(err)); |
| } |
| |
| static struct p9_fid *p9_fid_create(struct p9_client *clnt) |
| { |
| int ret; |
| struct p9_fid *fid; |
| |
| p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); |
| fid = kzalloc(sizeof(*fid), GFP_KERNEL); |
| if (!fid) |
| return NULL; |
| |
| fid->mode = -1; |
| fid->uid = current_fsuid(); |
| fid->clnt = clnt; |
| refcount_set(&fid->count, 1); |
| |
| idr_preload(GFP_KERNEL); |
| spin_lock_irq(&clnt->lock); |
| ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, |
| GFP_NOWAIT); |
| spin_unlock_irq(&clnt->lock); |
| idr_preload_end(); |
| if (!ret) |
| return fid; |
| |
| kfree(fid); |
| return NULL; |
| } |
| |
| static void p9_fid_destroy(struct p9_fid *fid) |
| { |
| struct p9_client *clnt; |
| unsigned long flags; |
| |
| p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); |
| clnt = fid->clnt; |
| spin_lock_irqsave(&clnt->lock, flags); |
| idr_remove(&clnt->fids, fid->fid); |
| spin_unlock_irqrestore(&clnt->lock, flags); |
| kfree(fid->rdir); |
| kfree(fid); |
| } |
| |
| static int p9_client_version(struct p9_client *c) |
| { |
| int err = 0; |
| struct p9_req_t *req; |
| char *version = NULL; |
| int msize; |
| |
| p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", |
| c->msize, c->proto_version); |
| |
| switch (c->proto_version) { |
| case p9_proto_2000L: |
| req = p9_client_rpc(c, P9_TVERSION, "ds", |
| c->msize, "9P2000.L"); |
| break; |
| case p9_proto_2000u: |
| req = p9_client_rpc(c, P9_TVERSION, "ds", |
| c->msize, "9P2000.u"); |
| break; |
| case p9_proto_legacy: |
| req = p9_client_rpc(c, P9_TVERSION, "ds", |
| c->msize, "9P2000"); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| |
| err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); |
| if (err) { |
| p9_debug(P9_DEBUG_9P, "version error %d\n", err); |
| trace_9p_protocol_dump(c, &req->rc); |
| goto error; |
| } |
| |
| p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); |
| if (!strncmp(version, "9P2000.L", 8)) { |
| c->proto_version = p9_proto_2000L; |
| } else if (!strncmp(version, "9P2000.u", 8)) { |
| c->proto_version = p9_proto_2000u; |
| } else if (!strncmp(version, "9P2000", 6)) { |
| c->proto_version = p9_proto_legacy; |
| } else { |
| p9_debug(P9_DEBUG_ERROR, |
| "server returned an unknown version: %s\n", version); |
| err = -EREMOTEIO; |
| goto error; |
| } |
| |
| if (msize < 4096) { |
| p9_debug(P9_DEBUG_ERROR, |
| "server returned a msize < 4096: %d\n", msize); |
| err = -EREMOTEIO; |
| goto error; |
| } |
| if (msize < c->msize) |
| c->msize = msize; |
| |
| error: |
| kfree(version); |
| p9_tag_remove(c, req); |
| |
| return err; |
| } |
| |
| struct p9_client *p9_client_create(const char *dev_name, char *options) |
| { |
| int err; |
| struct p9_client *clnt; |
| char *client_id; |
| |
| err = 0; |
| clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); |
| if (!clnt) |
| return ERR_PTR(-ENOMEM); |
| |
| clnt->trans_mod = NULL; |
| clnt->trans = NULL; |
| clnt->fcall_cache = NULL; |
| |
| client_id = utsname()->nodename; |
| memcpy(clnt->name, client_id, strlen(client_id) + 1); |
| |
| spin_lock_init(&clnt->lock); |
| idr_init(&clnt->fids); |
| idr_init(&clnt->reqs); |
| |
| 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) { |
| err = -EPROTONOSUPPORT; |
| p9_debug(P9_DEBUG_ERROR, |
| "No transport defined or default transport\n"); |
| goto free_client; |
| } |
| |
| p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", |
| clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); |
| |
| err = clnt->trans_mod->create(clnt, dev_name, options); |
| if (err) |
| goto put_trans; |
| |
| if (clnt->msize > clnt->trans_mod->maxsize) |
| clnt->msize = clnt->trans_mod->maxsize; |
| |
| if (clnt->msize < 4096) { |
| p9_debug(P9_DEBUG_ERROR, |
| "Please specify a msize of at least 4k\n"); |
| err = -EINVAL; |
| goto close_trans; |
| } |
| |
| err = p9_client_version(clnt); |
| if (err) |
| goto close_trans; |
| |
| /* P9_HDRSZ + 4 is the smallest packet header we can have that is |
| * followed by data accessed from userspace by read |
| */ |
| clnt->fcall_cache = |
| kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, |
| 0, 0, P9_HDRSZ + 4, |
| clnt->msize - (P9_HDRSZ + 4), |
| NULL); |
| |
| return clnt; |
| |
| close_trans: |
| clnt->trans_mod->close(clnt); |
| 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; |
| int id; |
| |
| p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); |
| |
| if (clnt->trans_mod) |
| clnt->trans_mod->close(clnt); |
| |
| v9fs_put_trans(clnt->trans_mod); |
| |
| idr_for_each_entry(&clnt->fids, fid, id) { |
| pr_info("Found fid %d not clunked\n", fid->fid); |
| p9_fid_destroy(fid); |
| } |
| |
| p9_tag_cleanup(clnt); |
| |
| kmem_cache_destroy(clnt->fcall_cache); |
| kfree(clnt); |
| } |
| EXPORT_SYMBOL(p9_client_destroy); |
| |
| void p9_client_disconnect(struct p9_client *clnt) |
| { |
| p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); |
| clnt->status = Disconnected; |
| } |
| EXPORT_SYMBOL(p9_client_disconnect); |
| |
| void p9_client_begin_disconnect(struct p9_client *clnt) |
| { |
| p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); |
| clnt->status = BeginDisconnect; |
| } |
| EXPORT_SYMBOL(p9_client_begin_disconnect); |
| |
| struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, |
| const char *uname, kuid_t n_uname, |
| const char *aname) |
| { |
| int err = 0; |
| struct p9_req_t *req; |
| struct p9_fid *fid; |
| struct p9_qid qid; |
| |
| p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", |
| afid ? afid->fid : -1, uname, aname); |
| fid = p9_fid_create(clnt); |
| if (!fid) { |
| err = -ENOMEM; |
| goto error; |
| } |
| fid->uid = n_uname; |
| |
| req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", 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->proto_version, "Q", &qid); |
| if (err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| p9_tag_remove(clnt, req); |
| goto error; |
| } |
| |
| p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", |
| qid.type, qid.path, qid.version); |
| |
| memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
| |
| p9_tag_remove(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_walk(struct p9_fid *oldfid, uint16_t nwname, |
| const unsigned char * const *wnames, int clone) |
| { |
| int err; |
| struct p9_client *clnt; |
| struct p9_fid *fid; |
| struct p9_qid *wqids; |
| struct p9_req_t *req; |
| u16 nwqids, count; |
| |
| err = 0; |
| wqids = NULL; |
| clnt = oldfid->clnt; |
| if (clone) { |
| fid = p9_fid_create(clnt); |
| if (!fid) { |
| err = -ENOMEM; |
| goto error; |
| } |
| |
| fid->uid = oldfid->uid; |
| } else { |
| fid = oldfid; |
| } |
| |
| p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud 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->proto_version, "R", &nwqids, &wqids); |
| if (err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| p9_tag_remove(clnt, req); |
| goto clunk_fid; |
| } |
| p9_tag_remove(clnt, req); |
| |
| p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); |
| |
| if (nwqids != nwname) { |
| err = -ENOENT; |
| goto clunk_fid; |
| } |
| |
| for (count = 0; count < nwqids; count++) |
| p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", |
| count, wqids[count].type, |
| wqids[count].path, |
| wqids[count].version); |
| |
| if (nwname) |
| memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); |
| else |
| memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); |
| |
| kfree(wqids); |
| return fid; |
| |
| clunk_fid: |
| kfree(wqids); |
| 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; |
| |
| clnt = fid->clnt; |
| p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", |
| p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); |
| err = 0; |
| |
| if (fid->mode != -1) |
| return -EINVAL; |
| |
| if (p9_is_proto_dotl(clnt)) |
| req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); |
| else |
| 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->proto_version, "Qd", &qid, &iounit); |
| if (err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| goto free_and_error; |
| } |
| |
| p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", |
| p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, |
| qid.path, qid.version, iounit); |
| |
| memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
| fid->mode = mode; |
| fid->iounit = iounit; |
| |
| free_and_error: |
| p9_tag_remove(clnt, req); |
| error: |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_open); |
| |
| int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, |
| u32 mode, kgid_t gid, struct p9_qid *qid) |
| { |
| int err = 0; |
| struct p9_client *clnt; |
| struct p9_req_t *req; |
| int iounit; |
| |
| p9_debug(P9_DEBUG_9P, |
| ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", |
| ofid->fid, name, flags, mode, |
| from_kgid(&init_user_ns, gid)); |
| clnt = ofid->clnt; |
| |
| if (ofid->mode != -1) |
| return -EINVAL; |
| |
| req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, |
| mode, gid); |
| if (IS_ERR(req)) { |
| err = PTR_ERR(req); |
| goto error; |
| } |
| |
| err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); |
| if (err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| goto free_and_error; |
| } |
| |
| p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", |
| qid->type, qid->path, qid->version, iounit); |
| |
| memmove(&ofid->qid, qid, sizeof(struct p9_qid)); |
| ofid->mode = mode; |
| ofid->iounit = iounit; |
| |
| free_and_error: |
| p9_tag_remove(clnt, req); |
| error: |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_create_dotl); |
| |
| int p9_client_fcreate(struct p9_fid *fid, const 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_debug(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->proto_version, "Qd", &qid, &iounit); |
| if (err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| goto free_and_error; |
| } |
| |
| p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", |
| qid.type, qid.path, qid.version, iounit); |
| |
| memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
| fid->mode = mode; |
| fid->iounit = iounit; |
| |
| free_and_error: |
| p9_tag_remove(clnt, req); |
| error: |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_fcreate); |
| |
| int p9_client_symlink(struct p9_fid *dfid, const char *name, |
| const char *symtgt, kgid_t gid, struct p9_qid *qid) |
| { |
| int err = 0; |
| struct p9_client *clnt; |
| struct p9_req_t *req; |
| |
| p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", |
| dfid->fid, name, symtgt); |
| clnt = dfid->clnt; |
| |
| req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, |
| gid); |
| if (IS_ERR(req)) { |
| err = PTR_ERR(req); |
| goto error; |
| } |
| |
| err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
| if (err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| goto free_and_error; |
| } |
| |
| p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", |
| qid->type, qid->path, qid->version); |
| |
| free_and_error: |
| p9_tag_remove(clnt, req); |
| error: |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_symlink); |
| |
| int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) |
| { |
| struct p9_client *clnt; |
| struct p9_req_t *req; |
| |
| p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", |
| dfid->fid, oldfid->fid, newname); |
| clnt = dfid->clnt; |
| req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, |
| newname); |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| |
| p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); |
| p9_tag_remove(clnt, req); |
| return 0; |
| } |
| EXPORT_SYMBOL(p9_client_link); |
| |
| int p9_client_fsync(struct p9_fid *fid, int datasync) |
| { |
| int err; |
| struct p9_client *clnt; |
| struct p9_req_t *req; |
| |
| p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", |
| fid->fid, datasync); |
| err = 0; |
| clnt = fid->clnt; |
| |
| req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); |
| if (IS_ERR(req)) { |
| err = PTR_ERR(req); |
| goto error; |
| } |
| |
| p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); |
| |
| p9_tag_remove(clnt, req); |
| |
| error: |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_fsync); |
| |
| int p9_client_clunk(struct p9_fid *fid) |
| { |
| int err; |
| struct p9_client *clnt; |
| struct p9_req_t *req; |
| int retries = 0; |
| |
| if (!fid || IS_ERR(fid)) { |
| pr_warn("%s (%d): Trying to clunk with invalid fid\n", |
| __func__, task_pid_nr(current)); |
| dump_stack(); |
| return 0; |
| } |
| if (!refcount_dec_and_test(&fid->count)) |
| return 0; |
| |
| again: |
| p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", |
| fid->fid, retries); |
| 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_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); |
| |
| p9_tag_remove(clnt, req); |
| error: |
| /* Fid is not valid even after a failed clunk |
| * If interrupted, retry once then give up and |
| * leak fid until umount. |
| */ |
| if (err == -ERESTARTSYS) { |
| if (retries++ == 0) |
| goto again; |
| } else { |
| p9_fid_destroy(fid); |
| } |
| 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_debug(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_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); |
| |
| p9_tag_remove(clnt, req); |
| error: |
| if (err == -ERESTARTSYS) |
| p9_client_clunk(fid); |
| else |
| p9_fid_destroy(fid); |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_remove); |
| |
| int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) |
| { |
| int err = 0; |
| struct p9_req_t *req; |
| struct p9_client *clnt; |
| |
| p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", |
| dfid->fid, name, flags); |
| |
| clnt = dfid->clnt; |
| req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); |
| if (IS_ERR(req)) { |
| err = PTR_ERR(req); |
| goto error; |
| } |
| p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); |
| |
| p9_tag_remove(clnt, req); |
| error: |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_unlinkat); |
| |
| int |
| p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) |
| { |
| int total = 0; |
| *err = 0; |
| |
| while (iov_iter_count(to)) { |
| int count; |
| |
| count = p9_client_read_once(fid, offset, to, err); |
| if (!count || *err) |
| break; |
| offset += count; |
| total += count; |
| } |
| return total; |
| } |
| EXPORT_SYMBOL(p9_client_read); |
| |
| int |
| p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, |
| int *err) |
| { |
| struct p9_client *clnt = fid->clnt; |
| struct p9_req_t *req; |
| int count = iov_iter_count(to); |
| int rsize, non_zc = 0; |
| char *dataptr; |
| |
| *err = 0; |
| p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", |
| fid->fid, offset, iov_iter_count(to)); |
| |
| rsize = fid->iounit; |
| if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) |
| rsize = clnt->msize - P9_IOHDRSZ; |
| |
| if (count < rsize) |
| rsize = count; |
| |
| /* Don't bother zerocopy for small IO (< 1024) */ |
| if (clnt->trans_mod->zc_request && rsize > 1024) { |
| /* response header len is 11 |
| * PDU Header(7) + IO Size (4) |
| */ |
| req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, |
| 0, 11, "dqd", fid->fid, |
| offset, rsize); |
| } else { |
| non_zc = 1; |
| req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, |
| rsize); |
| } |
| if (IS_ERR(req)) { |
| *err = PTR_ERR(req); |
| return 0; |
| } |
| |
| *err = p9pdu_readf(&req->rc, clnt->proto_version, |
| "D", &count, &dataptr); |
| if (*err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| p9_tag_remove(clnt, req); |
| return 0; |
| } |
| if (rsize < count) { |
| pr_err("bogus RREAD count (%d > %d)\n", count, rsize); |
| count = rsize; |
| } |
| |
| p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); |
| |
| if (non_zc) { |
| int n = copy_to_iter(dataptr, count, to); |
| |
| if (n != count) { |
| *err = -EFAULT; |
| p9_tag_remove(clnt, req); |
| return n; |
| } |
| } else { |
| iov_iter_advance(to, count); |
| } |
| p9_tag_remove(clnt, req); |
| return count; |
| } |
| EXPORT_SYMBOL(p9_client_read_once); |
| |
| int |
| p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) |
| { |
| struct p9_client *clnt = fid->clnt; |
| struct p9_req_t *req; |
| int total = 0; |
| *err = 0; |
| |
| p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", |
| fid->fid, offset, iov_iter_count(from)); |
| |
| while (iov_iter_count(from)) { |
| int count = iov_iter_count(from); |
| int rsize = fid->iounit; |
| |
| if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) |
| rsize = clnt->msize - P9_IOHDRSZ; |
| |
| if (count < rsize) |
| rsize = count; |
| |
| /* Don't bother zerocopy for small IO (< 1024) */ |
| if (clnt->trans_mod->zc_request && rsize > 1024) { |
| req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, |
| rsize, P9_ZC_HDR_SZ, "dqd", |
| fid->fid, offset, rsize); |
| } else { |
| req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, |
| offset, rsize, from); |
| } |
| if (IS_ERR(req)) { |
| *err = PTR_ERR(req); |
| break; |
| } |
| |
| *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); |
| if (*err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| p9_tag_remove(clnt, req); |
| break; |
| } |
| if (rsize < count) { |
| pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); |
| count = rsize; |
| } |
| |
| p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); |
| |
| p9_tag_remove(clnt, req); |
| iov_iter_advance(from, count); |
| total += count; |
| offset += count; |
| } |
| return total; |
| } |
| 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; |
| struct p9_req_t *req; |
| u16 ignored; |
| |
| p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); |
| |
| ret = kmalloc(sizeof(*ret), GFP_KERNEL); |
| 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->proto_version, "wS", &ignored, ret); |
| if (err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| p9_tag_remove(clnt, req); |
| goto error; |
| } |
| |
| p9_debug(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, ret->qid.path, |
| ret->qid.version, ret->mode, |
| ret->atime, ret->mtime, ret->length, |
| ret->name, ret->uid, ret->gid, ret->muid, ret->extension, |
| from_kuid(&init_user_ns, ret->n_uid), |
| from_kgid(&init_user_ns, ret->n_gid), |
| from_kuid(&init_user_ns, ret->n_muid)); |
| |
| p9_tag_remove(clnt, req); |
| return ret; |
| |
| error: |
| kfree(ret); |
| return ERR_PTR(err); |
| } |
| EXPORT_SYMBOL(p9_client_stat); |
| |
| struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, |
| u64 request_mask) |
| { |
| int err; |
| struct p9_client *clnt; |
| struct p9_stat_dotl *ret; |
| struct p9_req_t *req; |
| |
| p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", |
| fid->fid, request_mask); |
| |
| ret = kmalloc(sizeof(*ret), GFP_KERNEL); |
| if (!ret) |
| return ERR_PTR(-ENOMEM); |
| |
| err = 0; |
| clnt = fid->clnt; |
| |
| req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); |
| if (IS_ERR(req)) { |
| err = PTR_ERR(req); |
| goto error; |
| } |
| |
| err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); |
| if (err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| p9_tag_remove(clnt, req); |
| goto error; |
| } |
| |
| p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" |
| "<<< qid=%x.%llx.%x\n" |
| "<<< st_mode=%8.8x st_nlink=%llu\n" |
| "<<< st_uid=%d st_gid=%d\n" |
| "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" |
| "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" |
| "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" |
| "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" |
| "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" |
| "<<< st_gen=%lld st_data_version=%lld\n", |
| ret->st_result_mask, |
| ret->qid.type, ret->qid.path, ret->qid.version, |
| ret->st_mode, ret->st_nlink, |
| from_kuid(&init_user_ns, ret->st_uid), |
| from_kgid(&init_user_ns, ret->st_gid), |
| ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, |
| ret->st_atime_sec, ret->st_atime_nsec, |
| ret->st_mtime_sec, ret->st_mtime_nsec, |
| ret->st_ctime_sec, ret->st_ctime_nsec, |
| ret->st_btime_sec, ret->st_btime_nsec, |
| ret->st_gen, ret->st_data_version); |
| |
| p9_tag_remove(clnt, req); |
| return ret; |
| |
| error: |
| kfree(ret); |
| return ERR_PTR(err); |
| } |
| EXPORT_SYMBOL(p9_client_getattr_dotl); |
| |
| static int p9_client_statsize(struct p9_wstat *wst, int proto_version) |
| { |
| 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 (proto_version == p9_proto_2000u || |
| proto_version == p9_proto_2000L) { |
| /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ |
| ret += 2 + 4 + 4 + 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->proto_version); |
| p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", |
| fid->fid); |
| p9_debug(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, |
| wst->qid.path, wst->qid.version, |
| wst->mode, wst->atime, wst->mtime, wst->length, |
| wst->name, wst->uid, wst->gid, wst->muid, wst->extension, |
| from_kuid(&init_user_ns, wst->n_uid), |
| from_kgid(&init_user_ns, wst->n_gid), |
| from_kuid(&init_user_ns, 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_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); |
| |
| p9_tag_remove(clnt, req); |
| error: |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_wstat); |
| |
| int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) |
| { |
| int err; |
| struct p9_req_t *req; |
| struct p9_client *clnt; |
| |
| err = 0; |
| clnt = fid->clnt; |
| p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); |
| p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", |
| p9attr->valid, p9attr->mode, |
| from_kuid(&init_user_ns, p9attr->uid), |
| from_kgid(&init_user_ns, p9attr->gid), |
| p9attr->size); |
| p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", |
| p9attr->atime_sec, p9attr->atime_nsec); |
| p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", |
| p9attr->mtime_sec, p9attr->mtime_nsec); |
| |
| req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); |
| |
| if (IS_ERR(req)) { |
| err = PTR_ERR(req); |
| goto error; |
| } |
| p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); |
| p9_tag_remove(clnt, req); |
| error: |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_setattr); |
| |
| int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) |
| { |
| int err; |
| struct p9_req_t *req; |
| struct p9_client *clnt; |
| |
| err = 0; |
| clnt = fid->clnt; |
| |
| p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); |
| |
| req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); |
| if (IS_ERR(req)) { |
| err = PTR_ERR(req); |
| goto error; |
| } |
| |
| err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, |
| &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, |
| &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); |
| if (err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| p9_tag_remove(clnt, req); |
| goto error; |
| } |
| |
| p9_debug(P9_DEBUG_9P, |
| "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", |
| fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, |
| sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); |
| |
| p9_tag_remove(clnt, req); |
| error: |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_statfs); |
| |
| int p9_client_rename(struct p9_fid *fid, |
| struct p9_fid *newdirfid, const char *name) |
| { |
| int err; |
| struct p9_req_t *req; |
| struct p9_client *clnt; |
| |
| err = 0; |
| clnt = fid->clnt; |
| |
| p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", |
| fid->fid, newdirfid->fid, name); |
| |
| req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, |
| newdirfid->fid, name); |
| if (IS_ERR(req)) { |
| err = PTR_ERR(req); |
| goto error; |
| } |
| |
| p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); |
| |
| p9_tag_remove(clnt, req); |
| error: |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_rename); |
| |
| int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, |
| struct p9_fid *newdirfid, const char *new_name) |
| { |
| int err; |
| struct p9_req_t *req; |
| struct p9_client *clnt; |
| |
| err = 0; |
| clnt = olddirfid->clnt; |
| |
| p9_debug(P9_DEBUG_9P, |
| ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", |
| olddirfid->fid, old_name, newdirfid->fid, new_name); |
| |
| req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, |
| old_name, newdirfid->fid, new_name); |
| if (IS_ERR(req)) { |
| err = PTR_ERR(req); |
| goto error; |
| } |
| |
| p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", |
| newdirfid->fid, new_name); |
| |
| p9_tag_remove(clnt, req); |
| error: |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_renameat); |
| |
| /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace |
| */ |
| struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, |
| const char *attr_name, u64 *attr_size) |
| { |
| int err; |
| struct p9_req_t *req; |
| struct p9_client *clnt; |
| struct p9_fid *attr_fid; |
| |
| err = 0; |
| clnt = file_fid->clnt; |
| attr_fid = p9_fid_create(clnt); |
| if (!attr_fid) { |
| err = -ENOMEM; |
| goto error; |
| } |
| p9_debug(P9_DEBUG_9P, |
| ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", |
| file_fid->fid, attr_fid->fid, attr_name); |
| |
| req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", |
| file_fid->fid, attr_fid->fid, attr_name); |
| if (IS_ERR(req)) { |
| err = PTR_ERR(req); |
| goto error; |
| } |
| err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); |
| if (err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| p9_tag_remove(clnt, req); |
| goto clunk_fid; |
| } |
| p9_tag_remove(clnt, req); |
| p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", |
| attr_fid->fid, *attr_size); |
| return attr_fid; |
| clunk_fid: |
| p9_client_clunk(attr_fid); |
| attr_fid = NULL; |
| error: |
| if (attr_fid && attr_fid != file_fid) |
| p9_fid_destroy(attr_fid); |
| |
| return ERR_PTR(err); |
| } |
| EXPORT_SYMBOL_GPL(p9_client_xattrwalk); |
| |
| int p9_client_xattrcreate(struct p9_fid *fid, const char *name, |
| u64 attr_size, int flags) |
| { |
| int err; |
| struct p9_req_t *req; |
| struct p9_client *clnt; |
| |
| p9_debug(P9_DEBUG_9P, |
| ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", |
| fid->fid, name, attr_size, flags); |
| err = 0; |
| clnt = fid->clnt; |
| req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", |
| fid->fid, name, attr_size, flags); |
| if (IS_ERR(req)) { |
| err = PTR_ERR(req); |
| goto error; |
| } |
| p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); |
| p9_tag_remove(clnt, req); |
| error: |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(p9_client_xattrcreate); |
| |
| int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) |
| { |
| int err, rsize, non_zc = 0; |
| struct p9_client *clnt; |
| struct p9_req_t *req; |
| char *dataptr; |
| struct kvec kv = {.iov_base = data, .iov_len = count}; |
| struct iov_iter to; |
| |
| iov_iter_kvec(&to, READ, &kv, 1, count); |
| |
| p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", |
| fid->fid, offset, count); |
| |
| err = 0; |
| clnt = fid->clnt; |
| |
| rsize = fid->iounit; |
| if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) |
| rsize = clnt->msize - P9_READDIRHDRSZ; |
| |
| if (count < rsize) |
| rsize = count; |
| |
| /* Don't bother zerocopy for small IO (< 1024) */ |
| if (clnt->trans_mod->zc_request && rsize > 1024) { |
| /* response header len is 11 |
| * PDU Header(7) + IO Size (4) |
| */ |
| req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, |
| 11, "dqd", fid->fid, offset, rsize); |
| } else { |
| non_zc = 1; |
| req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, |
| offset, rsize); |
| } |
| if (IS_ERR(req)) { |
| err = PTR_ERR(req); |
| goto error; |
| } |
| |
| err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); |
| if (err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| goto free_and_error; |
| } |
| if (rsize < count) { |
| pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); |
| count = rsize; |
| } |
| |
| p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); |
| |
| if (non_zc) |
| memmove(data, dataptr, count); |
| |
| p9_tag_remove(clnt, req); |
| return count; |
| |
| free_and_error: |
| p9_tag_remove(clnt, req); |
| error: |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_readdir); |
| |
| int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, |
| dev_t rdev, kgid_t gid, struct p9_qid *qid) |
| { |
| int err; |
| struct p9_client *clnt; |
| struct p9_req_t *req; |
| |
| err = 0; |
| clnt = fid->clnt; |
| p9_debug(P9_DEBUG_9P, |
| ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", |
| fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); |
| req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, |
| MAJOR(rdev), MINOR(rdev), gid); |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| |
| err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
| if (err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| goto error; |
| } |
| p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", |
| qid->type, qid->path, qid->version); |
| |
| error: |
| p9_tag_remove(clnt, req); |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_mknod_dotl); |
| |
| int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, |
| kgid_t gid, struct p9_qid *qid) |
| { |
| int err; |
| struct p9_client *clnt; |
| struct p9_req_t *req; |
| |
| err = 0; |
| clnt = fid->clnt; |
| p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", |
| fid->fid, name, mode, from_kgid(&init_user_ns, gid)); |
| req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", |
| fid->fid, name, mode, gid); |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| |
| err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
| if (err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| goto error; |
| } |
| p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, |
| qid->path, qid->version); |
| |
| error: |
| p9_tag_remove(clnt, req); |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_mkdir_dotl); |
| |
| int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) |
| { |
| int err; |
| struct p9_client *clnt; |
| struct p9_req_t *req; |
| |
| err = 0; |
| clnt = fid->clnt; |
| p9_debug(P9_DEBUG_9P, |
| ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", |
| fid->fid, flock->type, flock->flags, flock->start, |
| flock->length, flock->proc_id, flock->client_id); |
| |
| req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, |
| flock->flags, flock->start, flock->length, |
| flock->proc_id, flock->client_id); |
| |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| |
| err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); |
| if (err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| goto error; |
| } |
| p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); |
| error: |
| p9_tag_remove(clnt, req); |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_lock_dotl); |
| |
| int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) |
| { |
| int err; |
| struct p9_client *clnt; |
| struct p9_req_t *req; |
| |
| err = 0; |
| clnt = fid->clnt; |
| p9_debug(P9_DEBUG_9P, |
| ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", |
| fid->fid, glock->type, glock->start, glock->length, |
| glock->proc_id, glock->client_id); |
| |
| req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, |
| glock->type, glock->start, glock->length, |
| glock->proc_id, glock->client_id); |
| |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| |
| err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, |
| &glock->start, &glock->length, &glock->proc_id, |
| &glock->client_id); |
| if (err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| goto error; |
| } |
| p9_debug(P9_DEBUG_9P, |
| "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", |
| glock->type, glock->start, glock->length, |
| glock->proc_id, glock->client_id); |
| error: |
| p9_tag_remove(clnt, req); |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_getlock_dotl); |
| |
| int p9_client_readlink(struct p9_fid *fid, char **target) |
| { |
| int err; |
| struct p9_client *clnt; |
| struct p9_req_t *req; |
| |
| err = 0; |
| clnt = fid->clnt; |
| p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); |
| |
| req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| |
| err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); |
| if (err) { |
| trace_9p_protocol_dump(clnt, &req->rc); |
| goto error; |
| } |
| p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); |
| error: |
| p9_tag_remove(clnt, req); |
| return err; |
| } |
| EXPORT_SYMBOL(p9_client_readlink); |
| |
| int __init p9_client_init(void) |
| { |
| p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); |
| return p9_req_cache ? 0 : -ENOMEM; |
| } |
| |
| void __exit p9_client_exit(void) |
| { |
| kmem_cache_destroy(p9_req_cache); |
| } |