| /* |
| * linux/fs/9p/trans_fd.c |
| * |
| * Fd transport layer. Includes deprecated socket layer. |
| * |
| * Copyright (C) 2006 by Russ Cox <rsc@swtch.com> |
| * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net> |
| * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> |
| * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com> |
| * |
| * 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/in.h> |
| #include <linux/module.h> |
| #include <linux/net.h> |
| #include <linux/ipv6.h> |
| #include <linux/kthread.h> |
| #include <linux/errno.h> |
| #include <linux/kernel.h> |
| #include <linux/un.h> |
| #include <linux/uaccess.h> |
| #include <linux/inet.h> |
| #include <linux/idr.h> |
| #include <linux/file.h> |
| #include <linux/parser.h> |
| #include <net/9p/9p.h> |
| #include <net/9p/transport.h> |
| |
| #define P9_PORT 564 |
| #define MAX_SOCK_BUF (64*1024) |
| #define ERREQFLUSH 1 |
| #define SCHED_TIMEOUT 10 |
| #define MAXPOLLWADDR 2 |
| |
| /** |
| * struct p9_fd_opts - per-transport options |
| * @rfd: file descriptor for reading (trans=fd) |
| * @wfd: file descriptor for writing (trans=fd) |
| * @port: port to connect to (trans=tcp) |
| * |
| */ |
| |
| struct p9_fd_opts { |
| int rfd; |
| int wfd; |
| u16 port; |
| }; |
| |
| |
| /** |
| * struct p9_trans_fd - transport state |
| * @rd: reference to file to read from |
| * @wr: reference of file to write to |
| * @conn: connection state reference |
| * |
| */ |
| |
| struct p9_trans_fd { |
| struct file *rd; |
| struct file *wr; |
| struct p9_conn *conn; |
| }; |
| |
| /* |
| * Option Parsing (code inspired by NFS code) |
| * - a little lazy - parse all fd-transport options |
| */ |
| |
| enum { |
| /* Options that take integer arguments */ |
| Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
| }; |
| |
| static match_table_t tokens = { |
| {Opt_port, "port=%u"}, |
| {Opt_rfdno, "rfdno=%u"}, |
| {Opt_wfdno, "wfdno=%u"}, |
| {Opt_err, NULL}, |
| }; |
| |
| enum { |
| Rworksched = 1, /* read work scheduled or running */ |
| Rpending = 2, /* can read */ |
| Wworksched = 4, /* write work scheduled or running */ |
| Wpending = 8, /* can write */ |
| }; |
| |
| enum { |
| None, |
| Flushing, |
| Flushed, |
| }; |
| |
| struct p9_req; |
| typedef void (*p9_conn_req_callback)(struct p9_req *req, void *a); |
| |
| /** |
| * struct p9_req - fd mux encoding of an rpc transaction |
| * @lock: protects req_list |
| * @tag: numeric tag for rpc transaction |
| * @tcall: request &p9_fcall structure |
| * @rcall: response &p9_fcall structure |
| * @err: error state |
| * @cb: callback for when response is received |
| * @cba: argument to pass to callback |
| * @flush: flag to indicate RPC has been flushed |
| * @req_list: list link for higher level objects to chain requests |
| * |
| */ |
| |
| struct p9_req { |
| spinlock_t lock; |
| int tag; |
| struct p9_fcall *tcall; |
| struct p9_fcall *rcall; |
| int err; |
| p9_conn_req_callback cb; |
| void *cba; |
| int flush; |
| struct list_head req_list; |
| }; |
| |
| struct p9_mux_poll_task { |
| struct task_struct *task; |
| struct list_head mux_list; |
| int muxnum; |
| }; |
| |
| /** |
| * struct p9_conn - fd mux connection state information |
| * @lock: protects mux_list (?) |
| * @mux_list: list link for mux to manage multiple connections (?) |
| * @poll_task: task polling on this connection |
| * @msize: maximum size for connection (dup) |
| * @extended: 9p2000.u flag (dup) |
| * @trans: reference to transport instance for this connection |
| * @tagpool: id accounting for transactions |
| * @err: error state |
| * @req_list: accounting for requests which have been sent |
| * @unsent_req_list: accounting for requests that haven't been sent |
| * @rcall: current response &p9_fcall structure |
| * @rpos: read position in current frame |
| * @rbuf: current read buffer |
| * @wpos: write position for current frame |
| * @wsize: amount of data to write for current frame |
| * @wbuf: current write buffer |
| * @poll_wait: array of wait_q's for various worker threads |
| * @poll_waddr: ???? |
| * @pt: poll state |
| * @rq: current read work |
| * @wq: current write work |
| * @wsched: ???? |
| * |
| */ |
| |
| struct p9_conn { |
| spinlock_t lock; /* protect lock structure */ |
| struct list_head mux_list; |
| struct p9_mux_poll_task *poll_task; |
| int msize; |
| unsigned char extended; |
| struct p9_trans *trans; |
| struct p9_idpool *tagpool; |
| int err; |
| struct list_head req_list; |
| struct list_head unsent_req_list; |
| struct p9_fcall *rcall; |
| int rpos; |
| char *rbuf; |
| int wpos; |
| int wsize; |
| char *wbuf; |
| wait_queue_t poll_wait[MAXPOLLWADDR]; |
| wait_queue_head_t *poll_waddr[MAXPOLLWADDR]; |
| poll_table pt; |
| struct work_struct rq; |
| struct work_struct wq; |
| unsigned long wsched; |
| }; |
| |
| /** |
| * struct p9_mux_rpc - fd mux rpc accounting structure |
| * @m: connection this request was issued on |
| * @err: error state |
| * @tcall: request &p9_fcall |
| * @rcall: response &p9_fcall |
| * @wqueue: wait queue that client is blocked on for this rpc |
| * |
| * Bug: isn't this information duplicated elsewhere like &p9_req |
| */ |
| |
| struct p9_mux_rpc { |
| struct p9_conn *m; |
| int err; |
| struct p9_fcall *tcall; |
| struct p9_fcall *rcall; |
| wait_queue_head_t wqueue; |
| }; |
| |
| static int p9_poll_proc(void *); |
| static void p9_read_work(struct work_struct *work); |
| static void p9_write_work(struct work_struct *work); |
| static void p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, |
| poll_table *p); |
| static int p9_fd_write(struct p9_trans *trans, void *v, int len); |
| static int p9_fd_read(struct p9_trans *trans, void *v, int len); |
| |
| static DEFINE_MUTEX(p9_mux_task_lock); |
| static struct workqueue_struct *p9_mux_wq; |
| |
| static int p9_mux_num; |
| static int p9_mux_poll_task_num; |
| static struct p9_mux_poll_task p9_mux_poll_tasks[100]; |
| |
| static void p9_conn_destroy(struct p9_conn *); |
| static unsigned int p9_fd_poll(struct p9_trans *trans, |
| struct poll_table_struct *pt); |
| |
| #ifdef P9_NONBLOCK |
| static int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc, |
| p9_conn_req_callback cb, void *a); |
| #endif /* P9_NONBLOCK */ |
| |
| static void p9_conn_cancel(struct p9_conn *m, int err); |
| |
| static int p9_mux_global_init(void) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) |
| p9_mux_poll_tasks[i].task = NULL; |
| |
| p9_mux_wq = create_workqueue("v9fs"); |
| if (!p9_mux_wq) { |
| printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n"); |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| static u16 p9_mux_get_tag(struct p9_conn *m) |
| { |
| int tag; |
| |
| tag = p9_idpool_get(m->tagpool); |
| if (tag < 0) |
| return P9_NOTAG; |
| else |
| return (u16) tag; |
| } |
| |
| static void p9_mux_put_tag(struct p9_conn *m, u16 tag) |
| { |
| if (tag != P9_NOTAG && p9_idpool_check(tag, m->tagpool)) |
| p9_idpool_put(tag, m->tagpool); |
| } |
| |
| /** |
| * p9_mux_calc_poll_procs - calculates the number of polling procs |
| * @muxnum: number of mounts |
| * |
| * Calculation is based on the number of mounted v9fs filesystems. |
| * The current implementation returns sqrt of the number of mounts. |
| */ |
| |
| static int p9_mux_calc_poll_procs(int muxnum) |
| { |
| int n; |
| |
| if (p9_mux_poll_task_num) |
| n = muxnum / p9_mux_poll_task_num + |
| (muxnum % p9_mux_poll_task_num ? 1 : 0); |
| else |
| n = 1; |
| |
| if (n > ARRAY_SIZE(p9_mux_poll_tasks)) |
| n = ARRAY_SIZE(p9_mux_poll_tasks); |
| |
| return n; |
| } |
| |
| static int p9_mux_poll_start(struct p9_conn *m) |
| { |
| int i, n; |
| struct p9_mux_poll_task *vpt, *vptlast; |
| struct task_struct *pproc; |
| |
| P9_DPRINTK(P9_DEBUG_MUX, "mux %p muxnum %d procnum %d\n", m, p9_mux_num, |
| p9_mux_poll_task_num); |
| mutex_lock(&p9_mux_task_lock); |
| |
| n = p9_mux_calc_poll_procs(p9_mux_num + 1); |
| if (n > p9_mux_poll_task_num) { |
| for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) { |
| if (p9_mux_poll_tasks[i].task == NULL) { |
| vpt = &p9_mux_poll_tasks[i]; |
| P9_DPRINTK(P9_DEBUG_MUX, "create proc %p\n", |
| vpt); |
| pproc = kthread_create(p9_poll_proc, vpt, |
| "v9fs-poll"); |
| |
| if (!IS_ERR(pproc)) { |
| vpt->task = pproc; |
| INIT_LIST_HEAD(&vpt->mux_list); |
| vpt->muxnum = 0; |
| p9_mux_poll_task_num++; |
| wake_up_process(vpt->task); |
| } |
| break; |
| } |
| } |
| |
| if (i >= ARRAY_SIZE(p9_mux_poll_tasks)) |
| P9_DPRINTK(P9_DEBUG_ERROR, |
| "warning: no free poll slots\n"); |
| } |
| |
| n = (p9_mux_num + 1) / p9_mux_poll_task_num + |
| ((p9_mux_num + 1) % p9_mux_poll_task_num ? 1 : 0); |
| |
| vptlast = NULL; |
| for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) { |
| vpt = &p9_mux_poll_tasks[i]; |
| if (vpt->task != NULL) { |
| vptlast = vpt; |
| if (vpt->muxnum < n) { |
| P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i); |
| list_add(&m->mux_list, &vpt->mux_list); |
| vpt->muxnum++; |
| m->poll_task = vpt; |
| memset(&m->poll_waddr, 0, |
| sizeof(m->poll_waddr)); |
| init_poll_funcptr(&m->pt, p9_pollwait); |
| break; |
| } |
| } |
| } |
| |
| if (i >= ARRAY_SIZE(p9_mux_poll_tasks)) { |
| if (vptlast == NULL) { |
| mutex_unlock(&p9_mux_task_lock); |
| return -ENOMEM; |
| } |
| |
| P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i); |
| list_add(&m->mux_list, &vptlast->mux_list); |
| vptlast->muxnum++; |
| m->poll_task = vptlast; |
| memset(&m->poll_waddr, 0, sizeof(m->poll_waddr)); |
| init_poll_funcptr(&m->pt, p9_pollwait); |
| } |
| |
| p9_mux_num++; |
| mutex_unlock(&p9_mux_task_lock); |
| |
| return 0; |
| } |
| |
| static void p9_mux_poll_stop(struct p9_conn *m) |
| { |
| int i; |
| struct p9_mux_poll_task *vpt; |
| |
| mutex_lock(&p9_mux_task_lock); |
| vpt = m->poll_task; |
| list_del(&m->mux_list); |
| for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) { |
| if (m->poll_waddr[i] != NULL) { |
| remove_wait_queue(m->poll_waddr[i], &m->poll_wait[i]); |
| m->poll_waddr[i] = NULL; |
| } |
| } |
| vpt->muxnum--; |
| if (!vpt->muxnum) { |
| P9_DPRINTK(P9_DEBUG_MUX, "destroy proc %p\n", vpt); |
| kthread_stop(vpt->task); |
| vpt->task = NULL; |
| p9_mux_poll_task_num--; |
| } |
| p9_mux_num--; |
| mutex_unlock(&p9_mux_task_lock); |
| } |
| |
| /** |
| * p9_conn_create - allocate and initialize the per-session mux data |
| * @trans: transport structure |
| * |
| * Note: Creates the polling task if this is the first session. |
| */ |
| |
| static struct p9_conn *p9_conn_create(struct p9_trans *trans) |
| { |
| int i, n; |
| struct p9_conn *m, *mtmp; |
| |
| P9_DPRINTK(P9_DEBUG_MUX, "transport %p msize %d\n", trans, |
| trans->msize); |
| m = kmalloc(sizeof(struct p9_conn), GFP_KERNEL); |
| if (!m) |
| return ERR_PTR(-ENOMEM); |
| |
| spin_lock_init(&m->lock); |
| INIT_LIST_HEAD(&m->mux_list); |
| m->msize = trans->msize; |
| m->extended = trans->extended; |
| m->trans = trans; |
| m->tagpool = p9_idpool_create(); |
| if (IS_ERR(m->tagpool)) { |
| mtmp = ERR_PTR(-ENOMEM); |
| kfree(m); |
| return mtmp; |
| } |
| |
| m->err = 0; |
| INIT_LIST_HEAD(&m->req_list); |
| INIT_LIST_HEAD(&m->unsent_req_list); |
| m->rcall = NULL; |
| m->rpos = 0; |
| m->rbuf = NULL; |
| m->wpos = m->wsize = 0; |
| m->wbuf = NULL; |
| INIT_WORK(&m->rq, p9_read_work); |
| INIT_WORK(&m->wq, p9_write_work); |
| m->wsched = 0; |
| memset(&m->poll_waddr, 0, sizeof(m->poll_waddr)); |
| m->poll_task = NULL; |
| n = p9_mux_poll_start(m); |
| if (n) { |
| kfree(m); |
| return ERR_PTR(n); |
| } |
| |
| n = p9_fd_poll(trans, &m->pt); |
| if (n & POLLIN) { |
| P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); |
| set_bit(Rpending, &m->wsched); |
| } |
| |
| if (n & POLLOUT) { |
| P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); |
| set_bit(Wpending, &m->wsched); |
| } |
| |
| for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) { |
| if (IS_ERR(m->poll_waddr[i])) { |
| p9_mux_poll_stop(m); |
| mtmp = (void *)m->poll_waddr; /* the error code */ |
| kfree(m); |
| m = mtmp; |
| break; |
| } |
| } |
| |
| return m; |
| } |
| |
| /** |
| * p9_mux_destroy - cancels all pending requests and frees mux resources |
| * @m: mux to destroy |
| * |
| */ |
| |
| static void p9_conn_destroy(struct p9_conn *m) |
| { |
| P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m, |
| m->mux_list.prev, m->mux_list.next); |
| |
| p9_mux_poll_stop(m); |
| cancel_work_sync(&m->rq); |
| cancel_work_sync(&m->wq); |
| |
| p9_conn_cancel(m, -ECONNRESET); |
| |
| m->trans = NULL; |
| p9_idpool_destroy(m->tagpool); |
| kfree(m); |
| } |
| |
| /** |
| * p9_pollwait - add poll task to the wait queue |
| * @filp: file pointer being polled |
| * @wait_address: wait_q to block on |
| * @p: poll state |
| * |
| * called by files poll operation to add v9fs-poll task to files wait queue |
| */ |
| |
| static void |
| p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) |
| { |
| int i; |
| struct p9_conn *m; |
| |
| m = container_of(p, struct p9_conn, pt); |
| for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) |
| if (m->poll_waddr[i] == NULL) |
| break; |
| |
| if (i >= ARRAY_SIZE(m->poll_waddr)) { |
| P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n"); |
| return; |
| } |
| |
| m->poll_waddr[i] = wait_address; |
| |
| if (!wait_address) { |
| P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n"); |
| m->poll_waddr[i] = ERR_PTR(-EIO); |
| return; |
| } |
| |
| init_waitqueue_entry(&m->poll_wait[i], m->poll_task->task); |
| add_wait_queue(wait_address, &m->poll_wait[i]); |
| } |
| |
| /** |
| * p9_poll_mux - polls a mux and schedules read or write works if necessary |
| * @m: connection to poll |
| * |
| */ |
| |
| static void p9_poll_mux(struct p9_conn *m) |
| { |
| int n; |
| |
| if (m->err < 0) |
| return; |
| |
| n = p9_fd_poll(m->trans, NULL); |
| if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { |
| P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n); |
| if (n >= 0) |
| n = -ECONNRESET; |
| p9_conn_cancel(m, n); |
| } |
| |
| if (n & POLLIN) { |
| set_bit(Rpending, &m->wsched); |
| P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); |
| if (!test_and_set_bit(Rworksched, &m->wsched)) { |
| P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); |
| queue_work(p9_mux_wq, &m->rq); |
| } |
| } |
| |
| if (n & POLLOUT) { |
| set_bit(Wpending, &m->wsched); |
| P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); |
| if ((m->wsize || !list_empty(&m->unsent_req_list)) |
| && !test_and_set_bit(Wworksched, &m->wsched)) { |
| P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); |
| queue_work(p9_mux_wq, &m->wq); |
| } |
| } |
| } |
| |
| /** |
| * p9_poll_proc - poll worker thread |
| * @a: thread state and arguments |
| * |
| * polls all v9fs transports for new events and queues the appropriate |
| * work to the work queue |
| * |
| */ |
| |
| static int p9_poll_proc(void *a) |
| { |
| struct p9_conn *m, *mtmp; |
| struct p9_mux_poll_task *vpt; |
| |
| vpt = a; |
| P9_DPRINTK(P9_DEBUG_MUX, "start %p %p\n", current, vpt); |
| while (!kthread_should_stop()) { |
| set_current_state(TASK_INTERRUPTIBLE); |
| |
| list_for_each_entry_safe(m, mtmp, &vpt->mux_list, mux_list) { |
| p9_poll_mux(m); |
| } |
| |
| P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n"); |
| schedule_timeout(SCHED_TIMEOUT * HZ); |
| } |
| |
| __set_current_state(TASK_RUNNING); |
| P9_DPRINTK(P9_DEBUG_MUX, "finish\n"); |
| return 0; |
| } |
| |
| /** |
| * p9_write_work - called when a transport can send some data |
| * @work: container for work to be done |
| * |
| */ |
| |
| static void p9_write_work(struct work_struct *work) |
| { |
| int n, err; |
| struct p9_conn *m; |
| struct p9_req *req; |
| |
| m = container_of(work, struct p9_conn, wq); |
| |
| if (m->err < 0) { |
| clear_bit(Wworksched, &m->wsched); |
| return; |
| } |
| |
| if (!m->wsize) { |
| if (list_empty(&m->unsent_req_list)) { |
| clear_bit(Wworksched, &m->wsched); |
| return; |
| } |
| |
| spin_lock(&m->lock); |
| again: |
| req = list_entry(m->unsent_req_list.next, struct p9_req, |
| req_list); |
| list_move_tail(&req->req_list, &m->req_list); |
| if (req->err == ERREQFLUSH) |
| goto again; |
| |
| m->wbuf = req->tcall->sdata; |
| m->wsize = req->tcall->size; |
| m->wpos = 0; |
| spin_unlock(&m->lock); |
| } |
| |
| P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos, |
| m->wsize); |
| clear_bit(Wpending, &m->wsched); |
| err = p9_fd_write(m->trans, m->wbuf + m->wpos, m->wsize - m->wpos); |
| P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err); |
| if (err == -EAGAIN) { |
| clear_bit(Wworksched, &m->wsched); |
| return; |
| } |
| |
| if (err < 0) |
| goto error; |
| else if (err == 0) { |
| err = -EREMOTEIO; |
| goto error; |
| } |
| |
| m->wpos += err; |
| if (m->wpos == m->wsize) |
| m->wpos = m->wsize = 0; |
| |
| if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) { |
| if (test_and_clear_bit(Wpending, &m->wsched)) |
| n = POLLOUT; |
| else |
| n = p9_fd_poll(m->trans, NULL); |
| |
| if (n & POLLOUT) { |
| P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); |
| queue_work(p9_mux_wq, &m->wq); |
| } else |
| clear_bit(Wworksched, &m->wsched); |
| } else |
| clear_bit(Wworksched, &m->wsched); |
| |
| return; |
| |
| error: |
| p9_conn_cancel(m, err); |
| clear_bit(Wworksched, &m->wsched); |
| } |
| |
| static void process_request(struct p9_conn *m, struct p9_req *req) |
| { |
| int ecode; |
| struct p9_str *ename; |
| |
| if (!req->err && req->rcall->id == P9_RERROR) { |
| ecode = req->rcall->params.rerror.errno; |
| ename = &req->rcall->params.rerror.error; |
| |
| P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len, |
| ename->str); |
| |
| if (m->extended) |
| req->err = -ecode; |
| |
| if (!req->err) { |
| req->err = p9_errstr2errno(ename->str, ename->len); |
| |
| /* string match failed */ |
| if (!req->err) { |
| PRINT_FCALL_ERROR("unknown error", req->rcall); |
| req->err = -ESERVERFAULT; |
| } |
| } |
| } else if (req->tcall && req->rcall->id != req->tcall->id + 1) { |
| P9_DPRINTK(P9_DEBUG_ERROR, |
| "fcall mismatch: expected %d, got %d\n", |
| req->tcall->id + 1, req->rcall->id); |
| if (!req->err) |
| req->err = -EIO; |
| } |
| } |
| |
| /** |
| * p9_read_work - called when there is some data to be read from a transport |
| * @work: container of work to be done |
| * |
| */ |
| |
| static void p9_read_work(struct work_struct *work) |
| { |
| int n, err; |
| struct p9_conn *m; |
| struct p9_req *req, *rptr, *rreq; |
| struct p9_fcall *rcall; |
| char *rbuf; |
| |
| m = container_of(work, struct p9_conn, rq); |
| |
| if (m->err < 0) |
| return; |
| |
| rcall = NULL; |
| P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos); |
| |
| if (!m->rcall) { |
| m->rcall = |
| kmalloc(sizeof(struct p9_fcall) + m->msize, GFP_KERNEL); |
| if (!m->rcall) { |
| err = -ENOMEM; |
| goto error; |
| } |
| |
| m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall); |
| m->rpos = 0; |
| } |
| |
| clear_bit(Rpending, &m->wsched); |
| err = p9_fd_read(m->trans, m->rbuf + m->rpos, m->msize - m->rpos); |
| P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err); |
| if (err == -EAGAIN) { |
| clear_bit(Rworksched, &m->wsched); |
| return; |
| } |
| |
| if (err <= 0) |
| goto error; |
| |
| m->rpos += err; |
| while (m->rpos > 4) { |
| n = le32_to_cpu(*(__le32 *) m->rbuf); |
| if (n >= m->msize) { |
| P9_DPRINTK(P9_DEBUG_ERROR, |
| "requested packet size too big: %d\n", n); |
| err = -EIO; |
| goto error; |
| } |
| |
| if (m->rpos < n) |
| break; |
| |
| err = |
| p9_deserialize_fcall(m->rbuf, n, m->rcall, m->extended); |
| if (err < 0) |
| goto error; |
| |
| #ifdef CONFIG_NET_9P_DEBUG |
| if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { |
| char buf[150]; |
| |
| p9_printfcall(buf, sizeof(buf), m->rcall, |
| m->extended); |
| printk(KERN_NOTICE ">>> %p %s\n", m, buf); |
| } |
| #endif |
| |
| rcall = m->rcall; |
| rbuf = m->rbuf; |
| if (m->rpos > n) { |
| m->rcall = kmalloc(sizeof(struct p9_fcall) + m->msize, |
| GFP_KERNEL); |
| if (!m->rcall) { |
| err = -ENOMEM; |
| goto error; |
| } |
| |
| m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall); |
| memmove(m->rbuf, rbuf + n, m->rpos - n); |
| m->rpos -= n; |
| } else { |
| m->rcall = NULL; |
| m->rbuf = NULL; |
| m->rpos = 0; |
| } |
| |
| P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m, |
| rcall->id, rcall->tag); |
| |
| req = NULL; |
| spin_lock(&m->lock); |
| list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) { |
| if (rreq->tag == rcall->tag) { |
| req = rreq; |
| if (req->flush != Flushing) |
| list_del(&req->req_list); |
| break; |
| } |
| } |
| spin_unlock(&m->lock); |
| |
| if (req) { |
| req->rcall = rcall; |
| process_request(m, req); |
| |
| if (req->flush != Flushing) { |
| if (req->cb) |
| (*req->cb) (req, req->cba); |
| else |
| kfree(req->rcall); |
| } |
| } else { |
| if (err >= 0 && rcall->id != P9_RFLUSH) |
| P9_DPRINTK(P9_DEBUG_ERROR, |
| "unexpected response mux %p id %d tag %d\n", |
| m, rcall->id, rcall->tag); |
| kfree(rcall); |
| } |
| } |
| |
| if (!list_empty(&m->req_list)) { |
| if (test_and_clear_bit(Rpending, &m->wsched)) |
| n = POLLIN; |
| else |
| n = p9_fd_poll(m->trans, NULL); |
| |
| if (n & POLLIN) { |
| P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); |
| queue_work(p9_mux_wq, &m->rq); |
| } else |
| clear_bit(Rworksched, &m->wsched); |
| } else |
| clear_bit(Rworksched, &m->wsched); |
| |
| return; |
| |
| error: |
| p9_conn_cancel(m, err); |
| clear_bit(Rworksched, &m->wsched); |
| } |
| |
| /** |
| * p9_send_request - send 9P request |
| * The function can sleep until the request is scheduled for sending. |
| * The function can be interrupted. Return from the function is not |
| * a guarantee that the request is sent successfully. Can return errors |
| * that can be retrieved by PTR_ERR macros. |
| * |
| * @m: mux data |
| * @tc: request to be sent |
| * @cb: callback function to call when response is received |
| * @cba: parameter to pass to the callback function |
| * |
| */ |
| |
| static struct p9_req *p9_send_request(struct p9_conn *m, |
| struct p9_fcall *tc, |
| p9_conn_req_callback cb, void *cba) |
| { |
| int n; |
| struct p9_req *req; |
| |
| P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current, |
| tc, tc->id); |
| if (m->err < 0) |
| return ERR_PTR(m->err); |
| |
| req = kmalloc(sizeof(struct p9_req), GFP_KERNEL); |
| if (!req) |
| return ERR_PTR(-ENOMEM); |
| |
| if (tc->id == P9_TVERSION) |
| n = P9_NOTAG; |
| else |
| n = p9_mux_get_tag(m); |
| |
| if (n < 0) |
| return ERR_PTR(-ENOMEM); |
| |
| p9_set_tag(tc, n); |
| |
| #ifdef CONFIG_NET_9P_DEBUG |
| if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { |
| char buf[150]; |
| |
| p9_printfcall(buf, sizeof(buf), tc, m->extended); |
| printk(KERN_NOTICE "<<< %p %s\n", m, buf); |
| } |
| #endif |
| |
| spin_lock_init(&req->lock); |
| req->tag = n; |
| req->tcall = tc; |
| req->rcall = NULL; |
| req->err = 0; |
| req->cb = cb; |
| req->cba = cba; |
| req->flush = None; |
| |
| spin_lock(&m->lock); |
| list_add_tail(&req->req_list, &m->unsent_req_list); |
| spin_unlock(&m->lock); |
| |
| if (test_and_clear_bit(Wpending, &m->wsched)) |
| n = POLLOUT; |
| else |
| n = p9_fd_poll(m->trans, NULL); |
| |
| if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) |
| queue_work(p9_mux_wq, &m->wq); |
| |
| return req; |
| } |
| |
| static void p9_mux_free_request(struct p9_conn *m, struct p9_req *req) |
| { |
| p9_mux_put_tag(m, req->tag); |
| kfree(req); |
| } |
| |
| static void p9_mux_flush_cb(struct p9_req *freq, void *a) |
| { |
| int tag; |
| struct p9_conn *m; |
| struct p9_req *req, *rreq, *rptr; |
| |
| m = a; |
| P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m, |
| freq->tcall, freq->rcall, freq->err, |
| freq->tcall->params.tflush.oldtag); |
| |
| spin_lock(&m->lock); |
| tag = freq->tcall->params.tflush.oldtag; |
| req = NULL; |
| list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) { |
| if (rreq->tag == tag) { |
| req = rreq; |
| list_del(&req->req_list); |
| break; |
| } |
| } |
| spin_unlock(&m->lock); |
| |
| if (req) { |
| spin_lock(&req->lock); |
| req->flush = Flushed; |
| spin_unlock(&req->lock); |
| |
| if (req->cb) |
| (*req->cb) (req, req->cba); |
| else |
| kfree(req->rcall); |
| } |
| |
| kfree(freq->tcall); |
| kfree(freq->rcall); |
| p9_mux_free_request(m, freq); |
| } |
| |
| static int |
| p9_mux_flush_request(struct p9_conn *m, struct p9_req *req) |
| { |
| struct p9_fcall *fc; |
| struct p9_req *rreq, *rptr; |
| |
| P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag); |
| |
| /* if a response was received for a request, do nothing */ |
| spin_lock(&req->lock); |
| if (req->rcall || req->err) { |
| spin_unlock(&req->lock); |
| P9_DPRINTK(P9_DEBUG_MUX, |
| "mux %p req %p response already received\n", m, req); |
| return 0; |
| } |
| |
| req->flush = Flushing; |
| spin_unlock(&req->lock); |
| |
| spin_lock(&m->lock); |
| /* if the request is not sent yet, just remove it from the list */ |
| list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) { |
| if (rreq->tag == req->tag) { |
| P9_DPRINTK(P9_DEBUG_MUX, |
| "mux %p req %p request is not sent yet\n", m, req); |
| list_del(&rreq->req_list); |
| req->flush = Flushed; |
| spin_unlock(&m->lock); |
| if (req->cb) |
| (*req->cb) (req, req->cba); |
| return 0; |
| } |
| } |
| spin_unlock(&m->lock); |
| |
| clear_thread_flag(TIF_SIGPENDING); |
| fc = p9_create_tflush(req->tag); |
| p9_send_request(m, fc, p9_mux_flush_cb, m); |
| return 1; |
| } |
| |
| static void |
| p9_conn_rpc_cb(struct p9_req *req, void *a) |
| { |
| struct p9_mux_rpc *r; |
| |
| P9_DPRINTK(P9_DEBUG_MUX, "req %p r %p\n", req, a); |
| r = a; |
| r->rcall = req->rcall; |
| r->err = req->err; |
| |
| if (req->flush != None && !req->err) |
| r->err = -ERESTARTSYS; |
| |
| wake_up(&r->wqueue); |
| } |
| |
| /** |
| * p9_fd_rpc- sends 9P request and waits until a response is available. |
| * The function can be interrupted. |
| * @t: transport data |
| * @tc: request to be sent |
| * @rc: pointer where a pointer to the response is stored |
| * |
| */ |
| |
| int |
| p9_fd_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc) |
| { |
| struct p9_trans_fd *p = t->priv; |
| struct p9_conn *m = p->conn; |
| int err, sigpending; |
| unsigned long flags; |
| struct p9_req *req; |
| struct p9_mux_rpc r; |
| |
| r.err = 0; |
| r.tcall = tc; |
| r.rcall = NULL; |
| r.m = m; |
| init_waitqueue_head(&r.wqueue); |
| |
| if (rc) |
| *rc = NULL; |
| |
| sigpending = 0; |
| if (signal_pending(current)) { |
| sigpending = 1; |
| clear_thread_flag(TIF_SIGPENDING); |
| } |
| |
| req = p9_send_request(m, tc, p9_conn_rpc_cb, &r); |
| if (IS_ERR(req)) { |
| err = PTR_ERR(req); |
| P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err); |
| return err; |
| } |
| |
| err = wait_event_interruptible(r.wqueue, r.rcall != NULL || r.err < 0); |
| if (r.err < 0) |
| err = r.err; |
| |
| if (err == -ERESTARTSYS && m->trans->status == Connected |
| && m->err == 0) { |
| if (p9_mux_flush_request(m, req)) { |
| /* wait until we get response of the flush message */ |
| do { |
| clear_thread_flag(TIF_SIGPENDING); |
| err = wait_event_interruptible(r.wqueue, |
| r.rcall || r.err); |
| } while (!r.rcall && !r.err && err == -ERESTARTSYS && |
| m->trans->status == Connected && !m->err); |
| |
| err = -ERESTARTSYS; |
| } |
| sigpending = 1; |
| } |
| |
| if (sigpending) { |
| spin_lock_irqsave(¤t->sighand->siglock, flags); |
| recalc_sigpending(); |
| spin_unlock_irqrestore(¤t->sighand->siglock, flags); |
| } |
| |
| if (rc) |
| *rc = r.rcall; |
| else |
| kfree(r.rcall); |
| |
| p9_mux_free_request(m, req); |
| if (err > 0) |
| err = -EIO; |
| |
| return err; |
| } |
| |
| #ifdef P9_NONBLOCK |
| /** |
| * p9_conn_rpcnb - sends 9P request without waiting for response. |
| * @m: mux data |
| * @tc: request to be sent |
| * @cb: callback function to be called when response arrives |
| * @a: value to pass to the callback function |
| * |
| */ |
| |
| int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc, |
| p9_conn_req_callback cb, void *a) |
| { |
| int err; |
| struct p9_req *req; |
| |
| req = p9_send_request(m, tc, cb, a); |
| if (IS_ERR(req)) { |
| err = PTR_ERR(req); |
| P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err); |
| return PTR_ERR(req); |
| } |
| |
| P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag); |
| return 0; |
| } |
| #endif /* P9_NONBLOCK */ |
| |
| /** |
| * p9_conn_cancel - cancel all pending requests with error |
| * @m: mux data |
| * @err: error code |
| * |
| */ |
| |
| void p9_conn_cancel(struct p9_conn *m, int err) |
| { |
| struct p9_req *req, *rtmp; |
| LIST_HEAD(cancel_list); |
| |
| P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); |
| m->err = err; |
| spin_lock(&m->lock); |
| list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { |
| list_move(&req->req_list, &cancel_list); |
| } |
| list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { |
| list_move(&req->req_list, &cancel_list); |
| } |
| spin_unlock(&m->lock); |
| |
| list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { |
| list_del(&req->req_list); |
| if (!req->err) |
| req->err = err; |
| |
| if (req->cb) |
| (*req->cb) (req, req->cba); |
| else |
| kfree(req->rcall); |
| } |
| } |
| |
| /** |
| * parse_options - parse mount options into session structure |
| * @options: options string passed from mount |
| * @opts: transport-specific structure to parse options into |
| * |
| * Returns 0 upon success, -ERRNO upon failure |
| */ |
| |
| static int parse_opts(char *params, struct p9_fd_opts *opts) |
| { |
| char *p; |
| substring_t args[MAX_OPT_ARGS]; |
| int option; |
| char *options; |
| int ret; |
| |
| opts->port = P9_PORT; |
| opts->rfd = ~0; |
| opts->wfd = ~0; |
| |
| if (!params) |
| return 0; |
| |
| options = kstrdup(params, 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; |
| int r; |
| if (!*p) |
| continue; |
| token = match_token(p, tokens, args); |
| 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_port: |
| opts->port = option; |
| break; |
| case Opt_rfdno: |
| opts->rfd = option; |
| break; |
| case Opt_wfdno: |
| opts->wfd = option; |
| break; |
| default: |
| continue; |
| } |
| } |
| kfree(options); |
| return 0; |
| } |
| |
| static int p9_fd_open(struct p9_trans *trans, int rfd, int wfd) |
| { |
| struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), |
| GFP_KERNEL); |
| if (!ts) |
| return -ENOMEM; |
| |
| ts->rd = fget(rfd); |
| ts->wr = fget(wfd); |
| if (!ts->rd || !ts->wr) { |
| if (ts->rd) |
| fput(ts->rd); |
| if (ts->wr) |
| fput(ts->wr); |
| kfree(ts); |
| return -EIO; |
| } |
| |
| trans->priv = ts; |
| trans->status = Connected; |
| |
| return 0; |
| } |
| |
| static int p9_socket_open(struct p9_trans *trans, struct socket *csocket) |
| { |
| int fd, ret; |
| |
| csocket->sk->sk_allocation = GFP_NOIO; |
| fd = sock_map_fd(csocket, 0); |
| if (fd < 0) { |
| P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n"); |
| return fd; |
| } |
| |
| ret = p9_fd_open(trans, fd, fd); |
| if (ret < 0) { |
| P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n"); |
| sockfd_put(csocket); |
| return ret; |
| } |
| |
| ((struct p9_trans_fd *)trans->priv)->rd->f_flags |= O_NONBLOCK; |
| |
| return 0; |
| } |
| |
| /** |
| * p9_fd_read- read from a fd |
| * @trans: transport instance state |
| * @v: buffer to receive data into |
| * @len: size of receive buffer |
| * |
| */ |
| |
| static int p9_fd_read(struct p9_trans *trans, void *v, int len) |
| { |
| int ret; |
| struct p9_trans_fd *ts = NULL; |
| |
| if (trans && trans->status != Disconnected) |
| ts = trans->priv; |
| |
| if (!ts) |
| return -EREMOTEIO; |
| |
| if (!(ts->rd->f_flags & O_NONBLOCK)) |
| P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n"); |
| |
| ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); |
| if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
| trans->status = Disconnected; |
| return ret; |
| } |
| |
| /** |
| * p9_fd_write - write to a socket |
| * @trans: transport instance state |
| * @v: buffer to send data from |
| * @len: size of send buffer |
| * |
| */ |
| |
| static int p9_fd_write(struct p9_trans *trans, void *v, int len) |
| { |
| int ret; |
| mm_segment_t oldfs; |
| struct p9_trans_fd *ts = NULL; |
| |
| if (trans && trans->status != Disconnected) |
| ts = trans->priv; |
| |
| if (!ts) |
| return -EREMOTEIO; |
| |
| if (!(ts->wr->f_flags & O_NONBLOCK)) |
| P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n"); |
| |
| oldfs = get_fs(); |
| set_fs(get_ds()); |
| /* The cast to a user pointer is valid due to the set_fs() */ |
| ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos); |
| set_fs(oldfs); |
| |
| if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
| trans->status = Disconnected; |
| return ret; |
| } |
| |
| static unsigned int |
| p9_fd_poll(struct p9_trans *trans, struct poll_table_struct *pt) |
| { |
| int ret, n; |
| struct p9_trans_fd *ts = NULL; |
| mm_segment_t oldfs; |
| |
| if (trans && trans->status == Connected) |
| ts = trans->priv; |
| |
| if (!ts) |
| return -EREMOTEIO; |
| |
| if (!ts->rd->f_op || !ts->rd->f_op->poll) |
| return -EIO; |
| |
| if (!ts->wr->f_op || !ts->wr->f_op->poll) |
| return -EIO; |
| |
| oldfs = get_fs(); |
| set_fs(get_ds()); |
| |
| ret = ts->rd->f_op->poll(ts->rd, pt); |
| if (ret < 0) |
| goto end; |
| |
| if (ts->rd != ts->wr) { |
| n = ts->wr->f_op->poll(ts->wr, pt); |
| if (n < 0) { |
| ret = n; |
| goto end; |
| } |
| ret = (ret & ~POLLOUT) | (n & ~POLLIN); |
| } |
| |
| end: |
| set_fs(oldfs); |
| return ret; |
| } |
| |
| /** |
| * p9_fd_close - shutdown socket |
| * @trans: private socket structure |
| * |
| */ |
| |
| static void p9_fd_close(struct p9_trans *trans) |
| { |
| struct p9_trans_fd *ts; |
| |
| if (!trans) |
| return; |
| |
| ts = xchg(&trans->priv, NULL); |
| |
| if (!ts) |
| return; |
| |
| p9_conn_destroy(ts->conn); |
| |
| trans->status = Disconnected; |
| if (ts->rd) |
| fput(ts->rd); |
| if (ts->wr) |
| fput(ts->wr); |
| kfree(ts); |
| } |
| |
| /* |
| * stolen from NFS - maybe should be made a generic function? |
| */ |
| static inline int valid_ipaddr4(const char *buf) |
| { |
| int rc, count, in[4]; |
| |
| rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); |
| if (rc != 4) |
| return -EINVAL; |
| for (count = 0; count < 4; count++) { |
| if (in[count] > 255) |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static struct p9_trans * |
| p9_trans_create_tcp(const char *addr, char *args, int msize, unsigned char dotu) |
| { |
| int err; |
| struct p9_trans *trans; |
| struct socket *csocket; |
| struct sockaddr_in sin_server; |
| struct p9_fd_opts opts; |
| struct p9_trans_fd *p; |
| |
| err = parse_opts(args, &opts); |
| if (err < 0) |
| return ERR_PTR(err); |
| |
| if (valid_ipaddr4(addr) < 0) |
| return ERR_PTR(-EINVAL); |
| |
| csocket = NULL; |
| trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); |
| if (!trans) |
| return ERR_PTR(-ENOMEM); |
| trans->msize = msize; |
| trans->extended = dotu; |
| trans->rpc = p9_fd_rpc; |
| trans->close = p9_fd_close; |
| |
| sin_server.sin_family = AF_INET; |
| sin_server.sin_addr.s_addr = in_aton(addr); |
| sin_server.sin_port = htons(opts.port); |
| sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket); |
| |
| if (!csocket) { |
| P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n"); |
| err = -EIO; |
| goto error; |
| } |
| |
| err = csocket->ops->connect(csocket, |
| (struct sockaddr *)&sin_server, |
| sizeof(struct sockaddr_in), 0); |
| if (err < 0) { |
| P9_EPRINTK(KERN_ERR, |
| "p9_trans_tcp: problem connecting socket to %s\n", |
| addr); |
| goto error; |
| } |
| |
| err = p9_socket_open(trans, csocket); |
| if (err < 0) |
| goto error; |
| |
| p = (struct p9_trans_fd *) trans->priv; |
| p->conn = p9_conn_create(trans); |
| if (IS_ERR(p->conn)) { |
| err = PTR_ERR(p->conn); |
| p->conn = NULL; |
| goto error; |
| } |
| |
| return trans; |
| |
| error: |
| if (csocket) |
| sock_release(csocket); |
| |
| kfree(trans); |
| return ERR_PTR(err); |
| } |
| |
| static struct p9_trans * |
| p9_trans_create_unix(const char *addr, char *args, int msize, |
| unsigned char dotu) |
| { |
| int err; |
| struct socket *csocket; |
| struct sockaddr_un sun_server; |
| struct p9_trans *trans; |
| struct p9_trans_fd *p; |
| |
| csocket = NULL; |
| trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); |
| if (!trans) |
| return ERR_PTR(-ENOMEM); |
| |
| trans->rpc = p9_fd_rpc; |
| trans->close = p9_fd_close; |
| |
| if (strlen(addr) > UNIX_PATH_MAX) { |
| P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n", |
| addr); |
| err = -ENAMETOOLONG; |
| goto error; |
| } |
| |
| sun_server.sun_family = PF_UNIX; |
| strcpy(sun_server.sun_path, addr); |
| sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket); |
| err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, |
| sizeof(struct sockaddr_un) - 1, 0); |
| if (err < 0) { |
| P9_EPRINTK(KERN_ERR, |
| "p9_trans_unix: problem connecting socket: %s: %d\n", |
| addr, err); |
| goto error; |
| } |
| |
| err = p9_socket_open(trans, csocket); |
| if (err < 0) |
| goto error; |
| |
| trans->msize = msize; |
| trans->extended = dotu; |
| p = (struct p9_trans_fd *) trans->priv; |
| p->conn = p9_conn_create(trans); |
| if (IS_ERR(p->conn)) { |
| err = PTR_ERR(p->conn); |
| p->conn = NULL; |
| goto error; |
| } |
| |
| return trans; |
| |
| error: |
| if (csocket) |
| sock_release(csocket); |
| |
| kfree(trans); |
| return ERR_PTR(err); |
| } |
| |
| static struct p9_trans * |
| p9_trans_create_fd(const char *name, char *args, int msize, |
| unsigned char extended) |
| { |
| int err; |
| struct p9_trans *trans; |
| struct p9_fd_opts opts; |
| struct p9_trans_fd *p; |
| |
| parse_opts(args, &opts); |
| |
| if (opts.rfd == ~0 || opts.wfd == ~0) { |
| printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); |
| return ERR_PTR(-ENOPROTOOPT); |
| } |
| |
| trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); |
| if (!trans) |
| return ERR_PTR(-ENOMEM); |
| |
| trans->rpc = p9_fd_rpc; |
| trans->close = p9_fd_close; |
| |
| err = p9_fd_open(trans, opts.rfd, opts.wfd); |
| if (err < 0) |
| goto error; |
| |
| trans->msize = msize; |
| trans->extended = extended; |
| p = (struct p9_trans_fd *) trans->priv; |
| p->conn = p9_conn_create(trans); |
| if (IS_ERR(p->conn)) { |
| err = PTR_ERR(p->conn); |
| p->conn = NULL; |
| goto error; |
| } |
| |
| return trans; |
| |
| error: |
| kfree(trans); |
| return ERR_PTR(err); |
| } |
| |
| static struct p9_trans_module p9_tcp_trans = { |
| .name = "tcp", |
| .maxsize = MAX_SOCK_BUF, |
| .def = 1, |
| .create = p9_trans_create_tcp, |
| .owner = THIS_MODULE, |
| }; |
| |
| static struct p9_trans_module p9_unix_trans = { |
| .name = "unix", |
| .maxsize = MAX_SOCK_BUF, |
| .def = 0, |
| .create = p9_trans_create_unix, |
| .owner = THIS_MODULE, |
| }; |
| |
| static struct p9_trans_module p9_fd_trans = { |
| .name = "fd", |
| .maxsize = MAX_SOCK_BUF, |
| .def = 0, |
| .create = p9_trans_create_fd, |
| .owner = THIS_MODULE, |
| }; |
| |
| int p9_trans_fd_init(void) |
| { |
| int ret = p9_mux_global_init(); |
| if (ret) { |
| printk(KERN_WARNING "9p: starting mux failed\n"); |
| return ret; |
| } |
| |
| v9fs_register_trans(&p9_tcp_trans); |
| v9fs_register_trans(&p9_unix_trans); |
| v9fs_register_trans(&p9_fd_trans); |
| |
| return 0; |
| } |
| |
| void p9_trans_fd_exit(void) |
| { |
| v9fs_unregister_trans(&p9_tcp_trans); |
| v9fs_unregister_trans(&p9_unix_trans); |
| v9fs_unregister_trans(&p9_fd_trans); |
| } |