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Diffstat (limited to 'net/9p/client.c')
-rw-r--r--net/9p/client.c1603
1 files changed, 1304 insertions, 299 deletions
diff --git a/net/9p/client.c b/net/9p/client.c
index 8af95b2dddd..0004cbaac4a 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -23,12 +23,15 @@
*
*/
+#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.h>
#include <linux/uaccess.h>
#include <net/9p/9p.h>
@@ -37,6 +40,9 @@
#include <net/9p/transport.h>
#include "protocol.h"
+#define CREATE_TRACE_POINTS
+#include <trace/events/9p.h>
+
/*
* Client Option Parsing (code inspired by NFS code)
* - a little lazy - parse all client options
@@ -46,6 +52,7 @@ enum {
Opt_msize,
Opt_trans,
Opt_legacy,
+ Opt_version,
Opt_err,
};
@@ -53,11 +60,55 @@ static const match_table_t tokens = {
{Opt_msize, "msize=%u"},
{Opt_legacy, "noextend"},
{Opt_trans, "trans=%s"},
+ {Opt_version, "version=%s"},
{Opt_err, NULL},
};
-static struct p9_req_t *
-p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
+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);
+
+/*
+ * 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_options - parse mount options into client structure
@@ -69,65 +120,108 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
static int parse_opts(char *opts, struct p9_client *clnt)
{
- char *options;
+ char *options, *tmp_options;
char *p;
substring_t args[MAX_OPT_ARGS];
int option;
+ char *s;
int ret = 0;
- clnt->dotu = 1;
+ clnt->proto_version = p9_proto_2000L;
clnt->msize = 8192;
if (!opts)
return 0;
- options = kstrdup(opts, GFP_KERNEL);
- if (!options) {
- P9_DPRINTK(P9_DEBUG_ERROR,
- "failed to allocate copy of option string\n");
+ tmp_options = kstrdup(opts, GFP_KERNEL);
+ if (!tmp_options) {
+ p9_debug(P9_DEBUG_ERROR,
+ "failed to allocate copy of option string\n");
return -ENOMEM;
}
+ options = tmp_options;
while ((p = strsep(&options, ",")) != NULL) {
- int token;
+ int token, r;
if (!*p)
continue;
token = match_token(p, tokens, args);
- if (token < Opt_trans) {
- int r = match_int(&args[0], &option);
+ switch (token) {
+ case Opt_msize:
+ r = match_int(&args[0], &option);
if (r < 0) {
- P9_DPRINTK(P9_DEBUG_ERROR,
- "integer field, but no integer?\n");
+ p9_debug(P9_DEBUG_ERROR,
+ "integer field, but no integer?\n");
ret = r;
continue;
}
- }
- switch (token) {
- case Opt_msize:
clnt->msize = option;
break;
case Opt_trans:
- clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
+ 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;
+ }
+ clnt->trans_mod = v9fs_get_trans_by_name(s);
+ if (clnt->trans_mod == NULL) {
+ pr_info("Could not find request transport: %s\n",
+ s);
+ ret = -EINVAL;
+ kfree(s);
+ goto free_and_return;
+ }
+ kfree(s);
break;
case Opt_legacy:
- clnt->dotu = 0;
+ 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;
+ }
+ ret = get_protocol_version(s);
+ if (ret == -EINVAL) {
+ kfree(s);
+ goto free_and_return;
+ }
+ kfree(s);
+ clnt->proto_version = ret;
break;
default:
continue;
}
}
- kfree(options);
+free_and_return:
+ kfree(tmp_options);
return ret;
}
+static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
+{
+ struct p9_fcall *fc;
+ fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
+ if (!fc)
+ return NULL;
+ fc->capacity = alloc_msize;
+ fc->sdata = (char *) fc + sizeof(struct p9_fcall);
+ return fc;
+}
+
/**
* p9_tag_alloc - lookup/allocate a request by tag
* @c: client session to lookup tag within
* @tag: numeric id for transaction
*
* this is a simple array lookup, but will grow the
- * request_slots as necessary to accomodate transaction
+ * request_slots as necessary to accommodate transaction
* ids which did not previously have a slot.
*
* this code relies on the client spinlock to manage locks, its
@@ -136,11 +230,13 @@ static int parse_opts(char *opts, struct p9_client *clnt)
*
*/
-static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
+static struct p9_req_t *
+p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
{
unsigned long flags;
int row, col;
struct p9_req_t *req;
+ int alloc_msize = min(c->msize, max_size);
/* This looks up the original request by tag so we know which
* buffer to read the data into */
@@ -155,7 +251,7 @@ static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
sizeof(struct p9_req_t), GFP_ATOMIC);
if (!c->reqs[row]) {
- printk(KERN_ERR "Couldn't grow tag array\n");
+ pr_err("Couldn't grow tag array\n");
spin_unlock_irqrestore(&c->lock, flags);
return ERR_PTR(-ENOMEM);
}
@@ -171,39 +267,36 @@ static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
col = tag % P9_ROW_MAXTAG;
req = &c->reqs[row][col];
- if (!req->tc) {
- req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
- if (!req->wq) {
- printk(KERN_ERR "Couldn't grow tag array\n");
- return ERR_PTR(-ENOMEM);
- }
+ if (!req->wq) {
+ req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
+ if (!req->wq)
+ goto grow_failed;
init_waitqueue_head(req->wq);
- req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
- GFP_KERNEL);
- req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
- GFP_KERNEL);
- if ((!req->tc) || (!req->rc)) {
- printk(KERN_ERR "Couldn't grow tag array\n");
- kfree(req->tc);
- kfree(req->rc);
- kfree(req->wq);
- req->tc = req->rc = NULL;
- req->wq = NULL;
- return ERR_PTR(-ENOMEM);
- }
- req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
- req->tc->capacity = c->msize;
- req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
- req->rc->capacity = c->msize;
}
+ if (!req->tc)
+ req->tc = p9_fcall_alloc(alloc_msize);
+ if (!req->rc)
+ req->rc = p9_fcall_alloc(alloc_msize);
+ if (!req->tc || !req->rc)
+ goto grow_failed;
+
p9pdu_reset(req->tc);
p9pdu_reset(req->rc);
req->tc->tag = tag-1;
req->status = REQ_STATUS_ALLOC;
- return &c->reqs[row][col];
+ return req;
+
+grow_failed:
+ pr_err("Couldn't grow tag array\n");
+ kfree(req->tc);
+ kfree(req->rc);
+ kfree(req->wq);
+ req->tc = req->rc = NULL;
+ req->wq = NULL;
+ return ERR_PTR(-ENOMEM);
}
/**
@@ -221,7 +314,8 @@ struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
* buffer to read the data into */
tag++;
- BUG_ON(tag >= c->max_tag);
+ if(tag >= c->max_tag)
+ return NULL;
row = tag / P9_ROW_MAXTAG;
col = tag % P9_ROW_MAXTAG;
@@ -245,12 +339,13 @@ static int p9_tag_init(struct p9_client *c)
c->tagpool = p9_idpool_create();
if (IS_ERR(c->tagpool)) {
err = PTR_ERR(c->tagpool);
- c->tagpool = NULL;
goto error;
}
-
- p9_idpool_get(c->tagpool); /* reserve tag 0 */
-
+ err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
+ if (err < 0) {
+ p9_idpool_destroy(c->tagpool);
+ goto error;
+ }
c->max_tag = 0;
error:
return err;
@@ -271,17 +366,19 @@ static void p9_tag_cleanup(struct p9_client *c)
for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
for (col = 0; col < P9_ROW_MAXTAG; col++) {
if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
- P9_DPRINTK(P9_DEBUG_MUX,
- "Attempting to cleanup non-free tag %d,%d\n",
- row, col);
+ p9_debug(P9_DEBUG_MUX,
+ "Attempting to cleanup non-free tag %d,%d\n",
+ row, col);
/* TODO: delay execution of cleanup */
return;
}
}
}
- if (c->tagpool)
+ if (c->tagpool) {
+ p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
p9_idpool_destroy(c->tagpool);
+ }
/* free requests associated with tags */
for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
@@ -305,7 +402,7 @@ static void p9_tag_cleanup(struct p9_client *c)
static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
{
int tag = r->tc->tag;
- P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
+ p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
r->status = REQ_STATUS_IDLE;
if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
@@ -318,11 +415,19 @@ static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
* req: request received
*
*/
-void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
+void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
{
- P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
+ 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 other thread wakes up will indeed be seen by the waiting side.
+ */
+ smp_wmb();
+ req->status = status;
+
wake_up(req->wq);
- P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
+ p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
}
EXPORT_SYMBOL(p9_client_cb);
@@ -357,8 +462,8 @@ p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
pdu->id = r_type;
pdu->tag = r_tag;
- P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
- pdu->id, pdu->tag);
+ p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
+ pdu->size, pdu->id, pdu->tag);
if (type)
*type = r_type;
@@ -390,45 +495,152 @@ static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
{
int8_t type;
int err;
+ int ecode;
err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
+ /*
+ * 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_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", 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 (type == P9_RERROR) {
- int ecode;
+ if (!p9_is_proto_dotl(c)) {
char *ename;
+ err = p9pdu_readf(req->rc, c->proto_version, "s?d",
+ &ename, &ecode);
+ if (err)
+ goto out_err;
+
+ if (p9_is_proto_dotu(c))
+ err = -ecode;
+
+ if (!err || !IS_ERR_VALUE(err)) {
+ err = p9_errstr2errno(ename, strlen(ename));
- err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode);
- if (err) {
- P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
- err);
- return err;
+ p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
+ -ecode, ename);
}
+ kfree(ename);
+ } else {
+ err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
+ err = -ecode;
+
+ p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
+ }
- if (c->dotu)
+ return err;
+
+out_err:
+ p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
+
+ return err;
+}
+
+/**
+ * p9_check_zc_errors - check 9p packet for error return and process it
+ * @c: current client instance
+ * @req: request to parse and check for error conditions
+ * @in_hdrlen: Size of response protocol buffer.
+ *
+ * returns error code if one is discovered, otherwise returns 0
+ *
+ * this will have to be more complicated if we have multiple
+ * error packet types
+ */
+
+static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
+ char *uidata, int in_hdrlen, int kern_buf)
+{
+ int err;
+ int ecode;
+ int8_t type;
+ char *ename = NULL;
+
+ err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
+ /*
+ * dump the response from server
+ * This should be after parse_header which poplulate pdu_fcall.
+ */
+ trace_9p_protocol_dump(c, req->rc);
+ if (err) {
+ p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
+ return err;
+ }
+
+ if (type != P9_RERROR && type != P9_RLERROR)
+ return 0;
+
+ if (!p9_is_proto_dotl(c)) {
+ /* Error is reported in string format */
+ int len;
+ /* 7 = header size for RERROR; */
+ int inline_len = in_hdrlen - 7;
+
+ len = req->rc->size - req->rc->offset;
+ if (len > (P9_ZC_HDR_SZ - 7)) {
+ err = -EFAULT;
+ goto out_err;
+ }
+
+ ename = &req->rc->sdata[req->rc->offset];
+ if (len > inline_len) {
+ /* We have error in external buffer */
+ if (kern_buf) {
+ memcpy(ename + inline_len, uidata,
+ len - inline_len);
+ } else {
+ err = copy_from_user(ename + inline_len,
+ uidata, len - inline_len);
+ if (err) {
+ err = -EFAULT;
+ goto out_err;
+ }
+ }
+ }
+ ename = NULL;
+ err = p9pdu_readf(req->rc, c->proto_version, "s?d",
+ &ename, &ecode);
+ if (err)
+ goto out_err;
+
+ if (p9_is_proto_dotu(c))
err = -ecode;
- if (!err || !IS_ERR_VALUE(err))
+ if (!err || !IS_ERR_VALUE(err)) {
err = p9_errstr2errno(ename, strlen(ename));
- P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
-
+ p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
+ -ecode, ename);
+ }
kfree(ename);
- } else
- err = 0;
+ } else {
+ err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
+ err = -ecode;
+ p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
+ }
+ return err;
+
+out_err:
+ p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
return err;
}
+static struct p9_req_t *
+p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
+
/**
* p9_client_flush - flush (cancel) a request
* @c: client state
* @oldreq: request to cancel
*
- * This sents a flush for a particular requests and links
+ * 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.
@@ -445,52 +657,40 @@ static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
if (err)
return err;
- P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
+ 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. */
- spin_lock(&c->lock);
- if (oldreq->status == REQ_STATUS_FLSH)
- list_del(&oldreq->req_list);
- spin_unlock(&c->lock);
+ /*
+ * if we haven't received a response for oldreq,
+ * remove it from the list
+ */
+ if (oldreq->status == REQ_STATUS_SENT)
+ if (c->trans_mod->cancelled)
+ c->trans_mod->cancelled(c, oldreq);
p9_free_req(c, req);
return 0;
}
-/**
- * p9_client_rpc - issue a request and wait for a response
- * @c: client session
- * @type: type of request
- * @fmt: protocol format string (see protocol.c)
- *
- * Returns request structure (which client must free using p9_free_req)
- */
-
-static struct p9_req_t *
-p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
+static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
+ int8_t type, int req_size,
+ const char *fmt, va_list ap)
{
- va_list ap;
int tag, err;
struct p9_req_t *req;
- unsigned long flags;
- int sigpending;
- P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
+ p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
- if (c->status != Connected)
+ /* we allow for any status other than disconnected */
+ if (c->status == Disconnected)
return ERR_PTR(-EIO);
- if (signal_pending(current)) {
- sigpending = 1;
- clear_thread_flag(TIF_SIGPENDING);
- } else
- sigpending = 0;
+ /* if status is begin_disconnected we allow only clunk request */
+ if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
+ return ERR_PTR(-EIO);
tag = P9_NOTAG;
if (type != P9_TVERSION) {
@@ -499,36 +699,82 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
return ERR_PTR(-ENOMEM);
}
- req = p9_tag_alloc(c, tag);
+ req = p9_tag_alloc(c, tag, req_size);
if (IS_ERR(req))
return req;
/* marshall the data */
p9pdu_prepare(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, tag);
+ return req;
+reterr:
+ p9_free_req(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_free_req)
+ */
+
+static struct p9_req_t *
+p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
+{
+ va_list ap;
+ int sigpending, err;
+ unsigned long flags;
+ struct p9_req_t *req;
+
va_start(ap, fmt);
- err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap);
+ req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
va_end(ap);
- p9pdu_finalize(req->tc);
+ if (IS_ERR(req))
+ return req;
+
+ if (signal_pending(current)) {
+ sigpending = 1;
+ clear_thread_flag(TIF_SIGPENDING);
+ } else
+ sigpending = 0;
err = c->trans_mod->request(c, req);
if (err < 0) {
- c->status = Disconnected;
+ if (err != -ERESTARTSYS && err != -EFAULT)
+ c->status = Disconnected;
goto reterr;
}
-
- P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
+again:
+ /* Wait for the response */
err = wait_event_interruptible(*req->wq,
- req->status >= REQ_STATUS_RCVD);
- P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
- req->wq, tag, err);
+ req->status >= REQ_STATUS_RCVD);
+
+ /*
+ * Make sure our req is coherent with regard to updates in other
+ * threads - echoes to wmb() in the callback
+ */
+ smp_rmb();
+
+ if ((err == -ERESTARTSYS) && (c->status == Connected)
+ && (type == P9_TFLUSH)) {
+ sigpending = 1;
+ clear_thread_flag(TIF_SIGPENDING);
+ goto again;
+ }
if (req->status == REQ_STATUS_ERROR) {
- P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
+ p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
err = req->t_err;
}
-
if ((err == -ERESTARTSYS) && (c->status == Connected)) {
- P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
+ p9_debug(P9_DEBUG_MUX, "flushing\n");
sigpending = 1;
clear_thread_flag(TIF_SIGPENDING);
@@ -539,27 +785,104 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
if (req->status == REQ_STATUS_RCVD)
err = 0;
}
-
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);
- if (!err) {
- P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
+ trace_9p_client_res(c, type, req->rc->tag, err);
+ if (!err)
+ return req;
+reterr:
+ p9_free_req(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: user bffer that should be ued for zero copy read
+ * @uodata: user buffer that shoud be user for zero copy write
+ * @inlen: read buffer size
+ * @olen: write buffer size
+ * @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_free_req)
+ */
+static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
+ char *uidata, char *uodata,
+ int inlen, int olen, int in_hdrlen,
+ int kern_buf, const char *fmt, ...)
+{
+ va_list ap;
+ int sigpending, err;
+ unsigned long flags;
+ struct p9_req_t *req;
+
+ va_start(ap, fmt);
+ /*
+ * We allocate a inline protocol data of only 4k bytes.
+ * The actual content is passed in zero-copy fashion.
+ */
+ req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
+ va_end(ap);
+ if (IS_ERR(req))
return req;
+
+ if (signal_pending(current)) {
+ sigpending = 1;
+ clear_thread_flag(TIF_SIGPENDING);
+ } else
+ sigpending = 0;
+
+ /* If we are called with KERNEL_DS force kern_buf */
+ if (segment_eq(get_fs(), KERNEL_DS))
+ kern_buf = 1;
+
+ err = c->trans_mod->zc_request(c, req, uidata, uodata,
+ inlen, olen, in_hdrlen, kern_buf);
+ if (err < 0) {
+ if (err == -EIO)
+ c->status = Disconnected;
+ goto reterr;
+ }
+ if (req->status == REQ_STATUS_ERROR) {
+ p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
+ err = req->t_err;
+ }
+ if ((err == -ERESTARTSYS) && (c->status == Connected)) {
+ p9_debug(P9_DEBUG_MUX, "flushing\n");
+ sigpending = 1;
+ clear_thread_flag(TIF_SIGPENDING);
+
+ if (c->trans_mod->cancel(c, req))
+ p9_client_flush(c, req);
+
+ /* if we received the response anyway, don't signal error */
+ if (req->status == REQ_STATUS_RCVD)
+ err = 0;
}
+ 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_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
+ trace_9p_client_res(c, type, req->rc->tag, err);
+ if (!err)
+ return req;
reterr:
- P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
- err);
p9_free_req(c, req);
- return ERR_PTR(err);
+ return ERR_PTR(safe_errno(err));
}
static struct p9_fid *p9_fid_create(struct p9_client *clnt)
@@ -568,7 +891,7 @@ static struct p9_fid *p9_fid_create(struct p9_client *clnt)
struct p9_fid *fid;
unsigned long flags;
- P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
+ p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
if (!fid)
return ERR_PTR(-ENOMEM);
@@ -601,7 +924,7 @@ static void p9_fid_destroy(struct p9_fid *fid)
struct p9_client *clnt;
unsigned long flags;
- P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
+ p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
clnt = fid->clnt;
p9_idpool_put(fid->fid, clnt->fidpool);
spin_lock_irqsave(&clnt->lock, flags);
@@ -611,32 +934,51 @@ static void p9_fid_destroy(struct p9_fid *fid)
kfree(fid);
}
-int p9_client_version(struct p9_client *c)
+static int p9_client_version(struct p9_client *c)
{
int err = 0;
struct p9_req_t *req;
char *version;
int msize;
- P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n",
- c->msize, c->dotu);
- req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize,
- c->dotu ? "9P2000.u" : "9P2000");
+ 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;
+ break;
+ }
+
if (IS_ERR(req))
return PTR_ERR(req);
- err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version);
+ err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
if (err) {
- P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
- p9pdu_dump(1, req->rc);
+ p9_debug(P9_DEBUG_9P, "version error %d\n", err);
+ trace_9p_protocol_dump(c, req->rc);
goto error;
}
- P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
- if (!memcmp(version, "9P2000.u", 8))
- c->dotu = 1;
- else if (!memcmp(version, "9P2000", 6))
- c->dotu = 0;
+ 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 {
err = -EREMOTEIO;
goto error;
@@ -651,12 +993,12 @@ error:
return err;
}
-EXPORT_SYMBOL(p9_client_version);
struct p9_client *p9_client_create(const char *dev_name, char *options)
{
int err;
struct p9_client *clnt;
+ char *client_id;
err = 0;
clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
@@ -665,49 +1007,63 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
clnt->trans_mod = NULL;
clnt->trans = NULL;
+
+ client_id = utsname()->nodename;
+ memcpy(clnt->name, client_id, strlen(client_id) + 1);
+
spin_lock_init(&clnt->lock);
INIT_LIST_HEAD(&clnt->fidlist);
- clnt->fidpool = p9_idpool_create();
- if (IS_ERR(clnt->fidpool)) {
- err = PTR_ERR(clnt->fidpool);
- clnt->fidpool = NULL;
- goto error;
- }
- p9_tag_init(clnt);
+ err = p9_tag_init(clnt);
+ if (err < 0)
+ goto free_client;
err = parse_opts(options, clnt);
if (err < 0)
- goto error;
+ goto destroy_tagpool;
if (!clnt->trans_mod)
clnt->trans_mod = v9fs_get_default_trans();
if (clnt->trans_mod == NULL) {
err = -EPROTONOSUPPORT;
- P9_DPRINTK(P9_DEBUG_ERROR,
- "No transport defined or default transport\n");
- goto error;
+ p9_debug(P9_DEBUG_ERROR,
+ "No transport defined or default transport\n");
+ goto destroy_tagpool;
}
- P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n",
- clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
+ clnt->fidpool = p9_idpool_create();
+ if (IS_ERR(clnt->fidpool)) {
+ err = PTR_ERR(clnt->fidpool);
+ goto put_trans;
+ }
+
+ 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 error;
+ goto destroy_fidpool;
- if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
- clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
+ if (clnt->msize > clnt->trans_mod->maxsize)
+ clnt->msize = clnt->trans_mod->maxsize;
err = p9_client_version(clnt);
if (err)
- goto error;
+ goto close_trans;
return clnt;
-error:
- p9_client_destroy(clnt);
+close_trans:
+ clnt->trans_mod->close(clnt);
+destroy_fidpool:
+ p9_idpool_destroy(clnt->fidpool);
+put_trans:
+ v9fs_put_trans(clnt->trans_mod);
+destroy_tagpool:
+ p9_idpool_destroy(clnt->tagpool);
+free_client:
+ kfree(clnt);
return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_create);
@@ -716,15 +1072,17 @@ void p9_client_destroy(struct p9_client *clnt)
{
struct p9_fid *fid, *fidptr;
- P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
+ p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
if (clnt->trans_mod)
clnt->trans_mod->close(clnt);
v9fs_put_trans(clnt->trans_mod);
- list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
+ list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
+ pr_info("Found fid %d not clunked\n", fid->fid);
p9_fid_destroy(fid);
+ }
if (clnt->fidpool)
p9_idpool_destroy(clnt->fidpool);
@@ -737,23 +1095,29 @@ EXPORT_SYMBOL(p9_client_destroy);
void p9_client_disconnect(struct p9_client *clnt)
{
- P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", 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,
- char *uname, u32 n_uname, char *aname)
+ char *uname, kuid_t n_uname, char *aname)
{
- int err;
+ int err = 0;
struct p9_req_t *req;
struct p9_fid *fid;
struct p9_qid qid;
- P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
- afid ? afid->fid : -1, uname, aname);
- err = 0;
+ 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 (IS_ERR(fid)) {
err = PTR_ERR(fid);
@@ -761,24 +1125,22 @@ struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
goto error;
}
- req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
+ 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->dotu, "Q", &qid);
+ err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
if (err) {
- p9pdu_dump(1, req->rc);
+ trace_9p_protocol_dump(clnt, req->rc);
p9_free_req(clnt, req);
goto error;
}
- P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
- qid.type,
- (unsigned long long)qid.path,
- qid.version);
+ p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
+ qid.type, (unsigned long long)qid.path, qid.version);
memmove(&fid->qid, &qid, sizeof(struct p9_qid));
@@ -792,65 +1154,18 @@ error:
}
EXPORT_SYMBOL(p9_client_attach);
-struct p9_fid *
-p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
-{
- int err;
- struct p9_req_t *req;
- struct p9_qid qid;
- struct p9_fid *afid;
-
- P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
- err = 0;
-
- afid = p9_fid_create(clnt);
- if (IS_ERR(afid)) {
- err = PTR_ERR(afid);
- afid = NULL;
- goto error;
- }
-
- req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
- afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
- if (IS_ERR(req)) {
- err = PTR_ERR(req);
- goto error;
- }
-
- err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
- if (err) {
- p9pdu_dump(1, req->rc);
- p9_free_req(clnt, req);
- goto error;
- }
-
- P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n",
- qid.type,
- (unsigned long long)qid.path,
- qid.version);
-
- memmove(&afid->qid, &qid, sizeof(struct p9_qid));
- p9_free_req(clnt, req);
- return afid;
-
-error:
- if (afid)
- p9_fid_destroy(afid);
- return ERR_PTR(err);
-}
-EXPORT_SYMBOL(p9_client_auth);
-
-struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
- int clone)
+struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
+ char **wnames, int clone)
{
int err;
struct p9_client *clnt;
struct p9_fid *fid;
struct p9_qid *wqids;
struct p9_req_t *req;
- int16_t nwqids, count;
+ uint16_t nwqids, count;
err = 0;
+ wqids = NULL;
clnt = oldfid->clnt;
if (clone) {
fid = p9_fid_create(clnt);
@@ -865,8 +1180,8 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
fid = oldfid;
- P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
- oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
+ 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);
@@ -875,15 +1190,15 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
goto error;
}
- err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids);
+ err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
if (err) {
- p9pdu_dump(1, req->rc);
+ trace_9p_protocol_dump(clnt, req->rc);
p9_free_req(clnt, req);
goto clunk_fid;
}
p9_free_req(clnt, req);
- P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
+ p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
if (nwqids != nwname) {
err = -ENOENT;
@@ -891,7 +1206,7 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
}
for (count = 0; count < nwqids; count++)
- P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
+ p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
count, wqids[count].type,
(unsigned long long)wqids[count].path,
wqids[count].version);
@@ -901,9 +1216,11 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
else
fid->qid = oldfid->qid;
+ kfree(wqids);
return fid;
clunk_fid:
+ kfree(wqids);
p9_client_clunk(fid);
fid = NULL;
@@ -923,29 +1240,32 @@ int p9_client_open(struct p9_fid *fid, int mode)
struct p9_qid qid;
int iounit;
- P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode);
- err = 0;
clnt = fid->clnt;
+ p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
+ p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
+ err = 0;
if (fid->mode != -1)
return -EINVAL;
- req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
+ if (p9_is_proto_dotl(clnt))
+ req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
+ else
+ req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
- err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
+ err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
if (err) {
- p9pdu_dump(1, req->rc);
+ trace_9p_protocol_dump(clnt, req->rc);
goto free_and_error;
}
- P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n",
- qid.type,
- (unsigned long long)qid.path,
- qid.version, iounit);
+ p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
+ p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
+ (unsigned long long)qid.path, qid.version, iounit);
fid->mode = mode;
fid->iounit = iounit;
@@ -957,6 +1277,51 @@ error:
}
EXPORT_SYMBOL(p9_client_open);
+int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
+ kgid_t gid, struct p9_qid *qid)
+{
+ int err = 0;
+ struct p9_client *clnt;
+ struct p9_req_t *req;
+ int iounit;
+
+ p9_debug(P9_DEBUG_9P,
+ ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
+ ofid->fid, name, flags, mode,
+ from_kgid(&init_user_ns, gid));
+ clnt = ofid->clnt;
+
+ if (ofid->mode != -1)
+ return -EINVAL;
+
+ req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
+ mode, gid);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto error;
+ }
+
+ err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
+ if (err) {
+ trace_9p_protocol_dump(clnt, req->rc);
+ goto free_and_error;
+ }
+
+ p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
+ qid->type,
+ (unsigned long long)qid->path,
+ qid->version, iounit);
+
+ ofid->mode = mode;
+ ofid->iounit = iounit;
+
+free_and_error:
+ p9_free_req(clnt, req);
+error:
+ return err;
+}
+EXPORT_SYMBOL(p9_client_create_dotl);
+
int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
char *extension)
{
@@ -966,7 +1331,7 @@ int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
struct p9_qid qid;
int iounit;
- P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
+ p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
fid->fid, name, perm, mode);
err = 0;
clnt = fid->clnt;
@@ -981,13 +1346,13 @@ int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
goto error;
}
- err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
+ err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
if (err) {
- p9pdu_dump(1, req->rc);
+ trace_9p_protocol_dump(clnt, req->rc);
goto free_and_error;
}
- P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
+ p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
qid.type,
(unsigned long long)qid.path,
qid.version, iounit);
@@ -1002,13 +1367,102 @@ error:
}
EXPORT_SYMBOL(p9_client_fcreate);
+int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
+ struct p9_qid *qid)
+{
+ int err = 0;
+ struct p9_client *clnt;
+ struct p9_req_t *req;
+
+ p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
+ dfid->fid, name, symtgt);
+ clnt = dfid->clnt;
+
+ req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
+ gid);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto error;
+ }
+
+ err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
+ if (err) {
+ trace_9p_protocol_dump(clnt, req->rc);
+ goto free_and_error;
+ }
+
+ p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
+ qid->type, (unsigned long long)qid->path, qid->version);
+
+free_and_error:
+ p9_free_req(clnt, req);
+error:
+ return err;
+}
+EXPORT_SYMBOL(p9_client_symlink);
+
+int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, 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_free_req(clnt, req);
+ return 0;
+}
+EXPORT_SYMBOL(p9_client_link);
+
+int p9_client_fsync(struct p9_fid *fid, int datasync)
+{
+ int err;
+ struct p9_client *clnt;
+ struct p9_req_t *req;
+
+ p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
+ fid->fid, datasync);
+ err = 0;
+ clnt = fid->clnt;
+
+ req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto error;
+ }
+
+ p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
+
+ p9_free_req(clnt, req);
+
+error:
+ return err;
+}
+EXPORT_SYMBOL(p9_client_fsync);
+
int p9_client_clunk(struct p9_fid *fid)
{
int err;
struct p9_client *clnt;
struct p9_req_t *req;
+ int retries = 0;
+
+ if (!fid) {
+ pr_warn("%s (%d): Trying to clunk with NULL fid\n",
+ __func__, task_pid_nr(current));
+ dump_stack();
+ return 0;
+ }
- P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
+again:
+ p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
+ retries);
err = 0;
clnt = fid->clnt;
@@ -1018,12 +1472,20 @@ int p9_client_clunk(struct p9_fid *fid)
goto error;
}
- P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
+ p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
p9_free_req(clnt, req);
- p9_fid_destroy(fid);
-
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);
@@ -1034,7 +1496,7 @@ int p9_client_remove(struct p9_fid *fid)
struct p9_client *clnt;
struct p9_req_t *req;
- P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
+ p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
err = 0;
clnt = fid->clnt;
@@ -1044,30 +1506,56 @@ int p9_client_remove(struct p9_fid *fid)
goto error;
}
- P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
+ p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
p9_free_req(clnt, req);
- p9_fid_destroy(fid);
-
error:
+ if (err == -ERESTARTSYS)
+ p9_client_clunk(fid);
+ else
+ p9_fid_destroy(fid);
return err;
}
EXPORT_SYMBOL(p9_client_remove);
+int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
+{
+ int err = 0;
+ struct p9_req_t *req;
+ struct p9_client *clnt;
+
+ p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
+ dfid->fid, name, flags);
+
+ clnt = dfid->clnt;
+ req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto error;
+ }
+ p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
+
+ p9_free_req(clnt, req);
+error:
+ return err;
+}
+EXPORT_SYMBOL(p9_client_unlinkat);
+
int
p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
u32 count)
{
- int err, rsize, total;
- struct p9_client *clnt;
- struct p9_req_t *req;
char *dataptr;
+ int kernel_buf = 0;
+ struct p9_req_t *req;
+ struct p9_client *clnt;
+ int err, rsize, non_zc = 0;
+
- P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
- (long long unsigned) offset, count);
+ p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
+ fid->fid, (unsigned long long) offset, count);
err = 0;
clnt = fid->clnt;
- total = 0;
rsize = fid->iounit;
if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
@@ -1076,32 +1564,50 @@ p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
if (count < rsize)
rsize = count;
- req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
+ /* Don't bother zerocopy for small IO (< 1024) */
+ if (clnt->trans_mod->zc_request && rsize > 1024) {
+ char *indata;
+ if (data) {
+ kernel_buf = 1;
+ indata = data;
+ } else
+ indata = (__force char *)udata;
+ /*
+ * response header len is 11
+ * PDU Header(7) + IO Size (4)
+ */
+ req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
+ 11, kernel_buf, "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);
goto error;
}
- err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr);
+ err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
if (err) {
- p9pdu_dump(1, req->rc);
+ trace_9p_protocol_dump(clnt, req->rc);
goto free_and_error;
}
- P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
-
- if (data) {
- memmove(data, dataptr, count);
- }
+ p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
- if (udata) {
- err = copy_to_user(udata, dataptr, count);
- if (err) {
- err = -EFAULT;
- goto free_and_error;
+ if (non_zc) {
+ if (data) {
+ memmove(data, dataptr, count);
+ } else {
+ err = copy_to_user(udata, dataptr, count);
+ if (err) {
+ err = -EFAULT;
+ goto free_and_error;
+ }
}
}
-
p9_free_req(clnt, req);
return count;
@@ -1116,15 +1622,15 @@ int
p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
u64 offset, u32 count)
{
- int err, rsize, total;
+ int err, rsize;
+ int kernel_buf = 0;
struct p9_client *clnt;
struct p9_req_t *req;
- P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
- fid->fid, (long long unsigned) offset, count);
+ p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
+ fid->fid, (unsigned long long) offset, count);
err = 0;
clnt = fid->clnt;
- total = 0;
rsize = fid->iounit;
if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
@@ -1132,24 +1638,38 @@ p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
if (count < rsize)
rsize = count;
- if (data)
- req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
- rsize, data);
- else
- req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
- rsize, udata);
+
+ /* Don't bother zerocopy for small IO (< 1024) */
+ if (clnt->trans_mod->zc_request && rsize > 1024) {
+ char *odata;
+ if (data) {
+ kernel_buf = 1;
+ odata = data;
+ } else
+ odata = (char *)udata;
+ req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
+ P9_ZC_HDR_SZ, kernel_buf, "dqd",
+ fid->fid, offset, rsize);
+ } else {
+ if (data)
+ req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
+ offset, rsize, data);
+ else
+ req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
+ offset, rsize, udata);
+ }
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
- err = p9pdu_readf(req->rc, clnt->dotu, "d", &count);
+ err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
if (err) {
- p9pdu_dump(1, req->rc);
+ trace_9p_protocol_dump(clnt, req->rc);
goto free_and_error;
}
- P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
+ p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
p9_free_req(clnt, req);
return count;
@@ -1169,7 +1689,7 @@ struct p9_wstat *p9_client_stat(struct p9_fid *fid)
struct p9_req_t *req;
u16 ignored;
- P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
+ p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
if (!ret)
return ERR_PTR(-ENOMEM);
@@ -1183,14 +1703,14 @@ struct p9_wstat *p9_client_stat(struct p9_fid *fid)
goto error;
}
- err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret);
+ err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
if (err) {
- p9pdu_dump(1, req->rc);
+ trace_9p_protocol_dump(clnt, req->rc);
p9_free_req(clnt, req);
goto error;
}
- P9_DPRINTK(P9_DEBUG_9P,
+ 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"
@@ -1199,7 +1719,9 @@ struct p9_wstat *p9_client_stat(struct p9_fid *fid)
(unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
ret->atime, ret->mtime, (unsigned long long)ret->length,
ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
- ret->n_uid, ret->n_gid, ret->n_muid);
+ 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_free_req(clnt, req);
return ret;
@@ -1210,14 +1732,76 @@ error:
}
EXPORT_SYMBOL(p9_client_stat);
-static int p9_client_statsize(struct p9_wstat *wst, int optional)
+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 = kmalloc(sizeof(struct p9_stat_dotl),
+ GFP_KERNEL);
+ struct p9_req_t *req;
+
+ p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
+ fid->fid, request_mask);
+
+ if (!ret)
+ return ERR_PTR(-ENOMEM);
+
+ err = 0;
+ clnt = fid->clnt;
+
+ req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto error;
+ }
+
+ err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
+ if (err) {
+ trace_9p_protocol_dump(clnt, req->rc);
+ p9_free_req(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",
+ 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_free_req(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+2+4+13+4+4+4+8+2+2+2+2;
+ ret = 2+4+13+4+4+4+8+2+2+2+2;
if (wst->name)
ret += strlen(wst->name);
@@ -1228,7 +1812,8 @@ static int p9_client_statsize(struct p9_wstat *wst, int optional)
if (wst->muid)
ret += strlen(wst->muid);
- if (optional) {
+ if ((proto_version == p9_proto_2000u) ||
+ (proto_version == p9_proto_2000L)) {
ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
if (wst->extension)
ret += strlen(wst->extension);
@@ -1245,9 +1830,9 @@ int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
err = 0;
clnt = fid->clnt;
- wst->size = p9_client_statsize(wst, clnt->dotu);
- P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
- P9_DPRINTK(P9_DEBUG_9P,
+ 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"
@@ -1256,18 +1841,438 @@ int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
(unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
wst->atime, wst->mtime, (unsigned long long)wst->length,
wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
- wst->n_uid, wst->n_gid, wst->n_muid);
+ 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, wst);
+ req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
- P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
+ p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
p9_free_req(clnt, req);
error:
return err;
}
EXPORT_SYMBOL(p9_client_wstat);
+
+int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
+{
+ int err;
+ struct p9_req_t *req;
+ struct p9_client *clnt;
+
+ err = 0;
+ clnt = fid->clnt;
+ p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
+ p9_debug(P9_DEBUG_9P,
+ " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
+ " atime_sec=%lld atime_nsec=%lld\n"
+ " mtime_sec=%lld mtime_nsec=%lld\n",
+ p9attr->valid, p9attr->mode,
+ from_kuid(&init_user_ns, p9attr->uid),
+ from_kgid(&init_user_ns, p9attr->gid),
+ p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
+ 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_free_req(clnt, req);
+error:
+ return err;
+}
+EXPORT_SYMBOL(p9_client_setattr);
+
+int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
+{
+ int err;
+ struct p9_req_t *req;
+ struct p9_client *clnt;
+
+ err = 0;
+ clnt = fid->clnt;
+
+ p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
+
+ req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto error;
+ }
+
+ err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
+ &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
+ &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
+ if (err) {
+ trace_9p_protocol_dump(clnt, req->rc);
+ p9_free_req(clnt, req);
+ goto error;
+ }
+
+ p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
+ "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
+ "fsid %llu namelen %ld\n",
+ fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
+ sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
+ sb->fsid, (long int)sb->namelen);
+
+ p9_free_req(clnt, req);
+error:
+ return err;
+}
+EXPORT_SYMBOL(p9_client_statfs);
+
+int p9_client_rename(struct p9_fid *fid,
+ struct p9_fid *newdirfid, const char *name)
+{
+ int err;
+ struct p9_req_t *req;
+ struct p9_client *clnt;
+
+ err = 0;
+ clnt = fid->clnt;
+
+ p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
+ fid->fid, newdirfid->fid, name);
+
+ req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
+ newdirfid->fid, name);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto error;
+ }
+
+ p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
+
+ p9_free_req(clnt, req);
+error:
+ return err;
+}
+EXPORT_SYMBOL(p9_client_rename);
+
+int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
+ struct p9_fid *newdirfid, const char *new_name)
+{
+ int err;
+ struct p9_req_t *req;
+ struct p9_client *clnt;
+
+ err = 0;
+ clnt = olddirfid->clnt;
+
+ p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
+ " newdirfid %d new name %s\n", olddirfid->fid, old_name,
+ newdirfid->fid, new_name);
+
+ req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
+ old_name, newdirfid->fid, new_name);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto error;
+ }
+
+ p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
+ newdirfid->fid, new_name);
+
+ p9_free_req(clnt, req);
+error:
+ return err;
+}
+EXPORT_SYMBOL(p9_client_renameat);
+
+/*
+ * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
+ */
+struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
+ const char *attr_name, u64 *attr_size)
+{
+ int err;
+ struct p9_req_t *req;
+ struct p9_client *clnt;
+ struct p9_fid *attr_fid;
+
+ err = 0;
+ clnt = file_fid->clnt;
+ attr_fid = p9_fid_create(clnt);
+ if (IS_ERR(attr_fid)) {
+ err = PTR_ERR(attr_fid);
+ attr_fid = NULL;
+ 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_free_req(clnt, req);
+ goto clunk_fid;
+ }
+ p9_free_req(clnt, req);
+ p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
+ attr_fid->fid, *attr_size);
+ return attr_fid;
+clunk_fid:
+ p9_client_clunk(attr_fid);
+ attr_fid = NULL;
+error:
+ if (attr_fid && (attr_fid != file_fid))
+ p9_fid_destroy(attr_fid);
+
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
+
+int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
+ u64 attr_size, int flags)
+{
+ int err;
+ struct p9_req_t *req;
+ struct p9_client *clnt;
+
+ p9_debug(P9_DEBUG_9P,
+ ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
+ fid->fid, name, (long long)attr_size, flags);
+ err = 0;
+ clnt = fid->clnt;
+ req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
+ fid->fid, name, attr_size, flags);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto error;
+ }
+ p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
+ p9_free_req(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;
+
+ p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
+ fid->fid, (unsigned long long) offset, count);
+
+ err = 0;
+ clnt = fid->clnt;
+
+ rsize = fid->iounit;
+ if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
+ rsize = clnt->msize - P9_READDIRHDRSZ;
+
+ if (count < rsize)
+ rsize = count;
+
+ /* Don't bother zerocopy for small IO (< 1024) */
+ if (clnt->trans_mod->zc_request && rsize > 1024) {
+ /*
+ * response header len is 11
+ * PDU Header(7) + IO Size (4)
+ */
+ req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
+ 11, 1, "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;
+ }
+
+ p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
+
+ if (non_zc)
+ memmove(data, dataptr, count);
+
+ p9_free_req(clnt, req);
+ return count;
+
+free_and_error:
+ p9_free_req(clnt, req);
+error:
+ return err;
+}
+EXPORT_SYMBOL(p9_client_readdir);
+
+int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
+ dev_t rdev, kgid_t gid, struct p9_qid *qid)
+{
+ int err;
+ struct p9_client *clnt;
+ struct p9_req_t *req;
+
+ err = 0;
+ clnt = fid->clnt;
+ p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
+ "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
+ req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
+ MAJOR(rdev), MINOR(rdev), gid);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
+ if (err) {
+ trace_9p_protocol_dump(clnt, req->rc);
+ goto error;
+ }
+ p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
+ (unsigned long long)qid->path, qid->version);
+
+error:
+ p9_free_req(clnt, req);
+ return err;
+
+}
+EXPORT_SYMBOL(p9_client_mknod_dotl);
+
+int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
+ kgid_t gid, struct p9_qid *qid)
+{
+ int err;
+ struct p9_client *clnt;
+ struct p9_req_t *req;
+
+ err = 0;
+ clnt = fid->clnt;
+ p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
+ fid->fid, name, mode, from_kgid(&init_user_ns, gid));
+ req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
+ gid);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
+ if (err) {
+ trace_9p_protocol_dump(clnt, req->rc);
+ goto error;
+ }
+ p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
+ (unsigned long long)qid->path, qid->version);
+
+error:
+ p9_free_req(clnt, req);
+ return err;
+
+}
+EXPORT_SYMBOL(p9_client_mkdir_dotl);
+
+int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
+{
+ int err;
+ struct p9_client *clnt;
+ struct p9_req_t *req;
+
+ err = 0;
+ clnt = fid->clnt;
+ p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
+ "start %lld length %lld proc_id %d client_id %s\n",
+ fid->fid, flock->type, flock->flags, flock->start,
+ flock->length, flock->proc_id, flock->client_id);
+
+ req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
+ flock->flags, flock->start, flock->length,
+ flock->proc_id, flock->client_id);
+
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
+ if (err) {
+ trace_9p_protocol_dump(clnt, req->rc);
+ goto error;
+ }
+ p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
+error:
+ p9_free_req(clnt, req);
+ return err;
+
+}
+EXPORT_SYMBOL(p9_client_lock_dotl);
+
+int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
+{
+ int err;
+ struct p9_client *clnt;
+ struct p9_req_t *req;
+
+ err = 0;
+ clnt = fid->clnt;
+ p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
+ "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
+ glock->start, glock->length, glock->proc_id, glock->client_id);
+
+ req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
+ glock->start, glock->length, glock->proc_id, glock->client_id);
+
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
+ &glock->start, &glock->length, &glock->proc_id,
+ &glock->client_id);
+ if (err) {
+ trace_9p_protocol_dump(clnt, req->rc);
+ goto error;
+ }
+ p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
+ "proc_id %d client_id %s\n", glock->type, glock->start,
+ glock->length, glock->proc_id, glock->client_id);
+error:
+ p9_free_req(clnt, req);
+ return err;
+}
+EXPORT_SYMBOL(p9_client_getlock_dotl);
+
+int p9_client_readlink(struct p9_fid *fid, char **target)
+{
+ int err;
+ struct p9_client *clnt;
+ struct p9_req_t *req;
+
+ err = 0;
+ clnt = fid->clnt;
+ p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
+
+ req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
+ if (err) {
+ trace_9p_protocol_dump(clnt, req->rc);
+ goto error;
+ }
+ p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
+error:
+ p9_free_req(clnt, req);
+ return err;
+}
+EXPORT_SYMBOL(p9_client_readlink);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 06:57:03 +0000