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linux/net/9p/client.c
Linus Torvalds a360f311f5 9p: fix slab cache name creation for real 
This was attempted by using the dev_name in the slab cache name, but as
Omar Sandoval pointed out, that can be an arbitrary string, eg something
like "/dev/root".  Which in turn trips verify_dirent_name(), which fails
if a filename contains a slash.

So just make it use a sequence counter, and make it an atomic_t to avoid
any possible races or locking issues.

Reported-and-tested-by: Omar Sandoval <osandov@fb.com>
Link: https://lore.kernel.org/all/ZxafcO8KWMlXaeWE@telecaster.dhcp.thefacebook.com/
Fixes: 79efebae4a ("9p: Avoid creating multiple slab caches with the same name")
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Dominique Martinet <asmadeus@codewreck.org>
Cc: Thorsten Leemhuis <regressions@leemhuis.info>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2024-10-21 15:41:29 -07:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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 <linux/netfs.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>
/* DEFAULT MSIZE = 32 pages worth of payload + P9_HDRSZ +
* room for write (16 extra) or read (11 extra) operands.
*/
#define DEFAULT_MSIZE ((128 * 1024) + P9_IOHDRSZ)
/* 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;
fc->id = 0;
fc->tag = P9_NOTAG;
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.
* @t_size: Buffer size for holding this request
* (automatic calculation by format template if 0).
* @r_size: Buffer size for holding server's reply on this request
* (automatic calculation by format template if 0).
* @fmt: Format template for assembling 9p request message
* (see p9pdu_vwritef).
* @ap: Variable arguments to be fed to passed format template
* (see p9pdu_vwritef).
*
* Context: Process context.
* Return: Pointer to new request.
*/
static struct p9_req_t *
p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size,
const char *fmt, va_list ap)
{
struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS);
int alloc_tsize;
int alloc_rsize;
int tag;
va_list apc;
va_copy(apc, ap);
alloc_tsize = min_t(size_t, c->msize,
t_size ?: p9_msg_buf_size(c, type, fmt, apc));
va_end(apc);
alloc_rsize = min_t(size_t, c->msize,
r_size ?: p9_msg_buf_size(c, type + 1, fmt, ap));
if (!req)
return ERR_PTR(-ENOMEM);
if (p9_fcall_init(c, &req->tc, alloc_tsize))
goto free_req;
if (p9_fcall_init(c, &req->rc, alloc_rsize))
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_req_put 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 void 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, "freeing 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);
}
int p9_req_put(struct p9_client *c, struct p9_req_t *r)
{
if (refcount_dec_and_test(&r->refcount)) {
p9_tag_remove(c, r);
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_req_put(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();
WRITE_ONCE(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 > req->rc.capacity && !req->rc.zc) {
pr_err("requested packet size too big: %d does not fit %zu (type=%d)\n",
req->rc.size, req->rc.capacity, req->rc.id);
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 = NULL;
err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
&ename, &ecode);
if (err) {
kfree(ename);
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;
}
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 (READ_ONCE(oldreq->status) == REQ_STATUS_SENT) {
if (c->trans_mod->cancelled)
c->trans_mod->cancelled(c, oldreq);
}
p9_req_put(c, req);
return 0;
}
static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
int8_t type, uint t_size, uint r_size,
const char *fmt, va_list ap)
{
int err;
struct p9_req_t *req;
va_list apc;
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);
va_copy(apc, ap);
req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc);
va_end(apc);
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_req_put(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_req_put)
*/
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;
/* Passing zero for tsize/rsize to p9_client_prepare_req() tells it to
* auto determine an appropriate (small) request/response size
* according to actual message data being sent. Currently RDMA
* transport is excluded from this response message size optimization,
* as it would not cope with it, due to its pooled response buffers
* (using an optimized request size for RDMA as well though).
*/
const uint tsize = 0;
const uint rsize = c->trans_mod->pooled_rbuffers ? c->msize : 0;
va_start(ap, fmt);
req = p9_client_prepare_req(c, type, tsize, rsize, fmt, ap);
va_end(ap);
if (IS_ERR(req))
return req;
req->tc.zc = false;
req->rc.zc = false;
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,
READ_ONCE(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 (READ_ONCE(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 (READ_ONCE(req->status) == REQ_STATUS_RCVD)
err = 0;
}
recalc_sigpending:
if (sigpending) {
spin_lock_irqsave(&current->sighand->siglock, flags);
recalc_sigpending();
spin_unlock_irqrestore(&current->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_req_put(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_req_put)
*/
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, P9_ZC_HDR_SZ, fmt, ap);
va_end(ap);
if (IS_ERR(req))
return req;
req->tc.zc = true;
req->rc.zc = true;
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 (READ_ONCE(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 (READ_ONCE(req->status) == REQ_STATUS_RCVD)
err = 0;
}
recalc_sigpending:
if (sigpending) {
spin_lock_irqsave(&current->sighand->siglock, flags);
recalc_sigpending();
spin_unlock_irqrestore(&current->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_req_put(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) {
trace_9p_fid_ref(fid, P9_FID_REF_CREATE);
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);
trace_9p_fid_ref(fid, P9_FID_REF_DESTROY);
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);
}
/* We also need to export tracepoint symbols for tracepoint_enabled() */
EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref);
void do_trace_9p_fid_get(struct p9_fid *fid)
{
trace_9p_fid_ref(fid, P9_FID_REF_GET);
}
EXPORT_SYMBOL(do_trace_9p_fid_get);
void do_trace_9p_fid_put(struct p9_fid *fid)
{
trace_9p_fid_ref(fid, P9_FID_REF_PUT);
}
EXPORT_SYMBOL(do_trace_9p_fid_put);
static int p9_client_version(struct p9_client *c)
{
int err;
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_req_put(c, req);
return err;
}
struct p9_client *p9_client_create(const char *dev_name, char *options)
{
int err;
static atomic_t seqno = ATOMIC_INIT(0);
struct p9_client *clnt;
char *client_id;
char *cache_name;
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;
pr_info("Limiting 'msize' to %d as this is the maximum "
"supported by transport %s\n",
clnt->msize, clnt->trans_mod->name
);
}
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;
cache_name = kasprintf(GFP_KERNEL,
"9p-fcall-cache-%u", atomic_inc_return(&seqno));
if (!cache_name) {
err = -ENOMEM;
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(cache_name, clnt->msize,
0, 0, P9_HDRSZ + 4,
clnt->msize - (P9_HDRSZ + 4),
NULL);
kfree(cache_name);
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;
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_req_put(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_req_put(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;
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_req_put(clnt, req);
goto clunk_fid;
}
p9_req_put(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_fid_put(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);
if (fid->mode != -1)
return -EINVAL;
if (p9_is_proto_dotl(clnt))
req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode & P9L_MODE_MASK);
else
req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode & P9L_MODE_MASK);
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_req_put(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;
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 & P9L_MODE_MASK, 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 = flags;
ofid->iounit = iounit;
free_and_error:
p9_req_put(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);
clnt = fid->clnt;
if (fid->mode != -1)
return -EINVAL;
req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
mode & P9L_MODE_MASK, 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_req_put(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;
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_req_put(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_req_put(clnt, req);
return 0;
}
EXPORT_SYMBOL(p9_client_link);
int p9_client_fsync(struct p9_fid *fid, int datasync)
{
int err = 0;
struct p9_client *clnt;
struct p9_req_t *req;
p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
fid->fid, datasync);
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_req_put(clnt, req);
error:
return err;
}
EXPORT_SYMBOL(p9_client_fsync);
int p9_client_clunk(struct p9_fid *fid)
{
int err = 0;
struct p9_client *clnt;
struct p9_req_t *req;
int retries = 0;
again:
p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n",
fid->fid, retries);
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_req_put(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 = 0;
struct p9_client *clnt;
struct p9_req_t *req;
p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
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_req_put(clnt, req);
error:
if (err == -ERESTARTSYS)
p9_fid_put(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_req_put(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, received, 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);
if (!non_zc)
iov_iter_revert(to, count - iov_iter_count(to));
return 0;
}
*err = p9pdu_readf(&req->rc, clnt->proto_version,
"D", &received, &dataptr);
if (*err) {
if (!non_zc)
iov_iter_revert(to, count - iov_iter_count(to));
trace_9p_protocol_dump(clnt, &req->rc);
p9_req_put(clnt, req);
return 0;
}
if (rsize < received) {
pr_err("bogus RREAD count (%d > %d)\n", received, rsize);
received = rsize;
}
p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", received);
if (non_zc) {
int n = copy_to_iter(dataptr, received, to);
if (n != received) {
*err = -EFAULT;
p9_req_put(clnt, req);
return n;
}
} else {
iov_iter_revert(to, count - received - iov_iter_count(to));
}
p9_req_put(clnt, req);
return received;
}
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;
while (iov_iter_count(from)) {
int count = iov_iter_count(from);
int rsize = fid->iounit;
int written;
if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
rsize = clnt->msize - P9_IOHDRSZ;
if (count < rsize)
rsize = count;
p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d (/%d)\n",
fid->fid, offset, 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)) {
iov_iter_revert(from, count - iov_iter_count(from));
*err = PTR_ERR(req);
break;
}
*err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written);
if (*err) {
iov_iter_revert(from, count - iov_iter_count(from));
trace_9p_protocol_dump(clnt, &req->rc);
p9_req_put(clnt, req);
break;
}
if (rsize < written) {
pr_err("bogus RWRITE count (%d > %d)\n", written, rsize);
written = rsize;
}
p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", written);
p9_req_put(clnt, req);
iov_iter_revert(from, count - written - iov_iter_count(from));
total += written;
offset += written;
}
return total;
}
EXPORT_SYMBOL(p9_client_write);
void
p9_client_write_subreq(struct netfs_io_subrequest *subreq)
{
struct netfs_io_request *wreq = subreq->rreq;
struct p9_fid *fid = wreq->netfs_priv;
struct p9_client *clnt = fid->clnt;
struct p9_req_t *req;
unsigned long long start = subreq->start + subreq->transferred;
int written, len = subreq->len - subreq->transferred;
int err;
p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu len %d\n",
fid->fid, start, len);
/* Don't bother zerocopy for small IO (< 1024) */
if (clnt->trans_mod->zc_request && len > 1024) {
req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, &subreq->io_iter,
0, wreq->len, P9_ZC_HDR_SZ, "dqd",
fid->fid, start, len);
} else {
req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
start, len, &subreq->io_iter);
}
if (IS_ERR(req)) {
netfs_write_subrequest_terminated(subreq, PTR_ERR(req), false);
return;
}
err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written);
if (err) {
trace_9p_protocol_dump(clnt, &req->rc);
p9_req_put(clnt, req);
netfs_write_subrequest_terminated(subreq, err, false);
return;
}
if (written > len) {
pr_err("bogus RWRITE count (%d > %u)\n", written, len);
written = len;
}
p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", len);
p9_req_put(clnt, req);
netfs_write_subrequest_terminated(subreq, written, false);
}
EXPORT_SYMBOL(p9_client_write_subreq);
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);
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_req_put(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_req_put(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);
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_req_put(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_req_put(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 = 0;
struct p9_req_t *req;
struct p9_client *clnt;
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_req_put(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 = 0;
struct p9_req_t *req;
struct p9_client *clnt;
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_req_put(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;
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_req_put(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_req_put(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 = 0;
struct p9_req_t *req;
struct p9_client *clnt;
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_req_put(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 = 0;
struct p9_req_t *req;
struct p9_client *clnt;
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_req_put(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;
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_req_put(clnt, req);
goto clunk_fid;
}
p9_req_put(clnt, req);
p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
attr_fid->fid, *attr_size);
return attr_fid;
clunk_fid:
p9_fid_put(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 = 0;
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);
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_req_put(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, ITER_DEST, &kv, 1, count);
p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
fid->fid, offset, count);
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_req_put(clnt, req);
return count;
free_and_error:
p9_req_put(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;
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_req_put(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;
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_req_put(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;
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_req_put(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;
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_req_put(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;
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_req_put(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);
}
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