fs/9p: Update zero-copy implementation in 9p (abfa034e) · Commits · e / devices / android_kernel_samsung_universal8895

include/net/9p/9p.h

+3 −8

Original line number	Diff line number	Diff line
		@@ -359,6 +359,9 @@ enum p9_qid_t {
		/* Room for readdir header */
		#define P9_READDIRHDRSZ 24

		/* size of header for zero copy read/write */
		#define P9_ZC_HDR_SZ 4096

		/**
		* struct p9_qid - file system entity information
		* @type: 8-bit type &p9_qid_t
		@@ -555,10 +558,6 @@ struct p9_rstatfs {
		* @tag: transaction id of the request
		* @offset: used by marshalling routines to track current position in buffer
		* @capacity: used by marshalling routines to track total malloc'd capacity
		* @pubuf: Payload user buffer given by the caller
		* @pkbuf: Payload kernel buffer given by the caller
		* @pbuf_size: pubuf/pkbuf(only one will be !NULL) size to be read/write.
		* @private: For transport layer's use.
		* @sdata: payload
		*
		* &p9_fcall represents the structure for all 9P RPC
		@@ -575,10 +574,6 @@ struct p9_fcall {

		size_t offset;
		size_t capacity;
		char __user *pubuf;
		char *pkbuf;
		size_t pbuf_size;
		void *private;

		u8 *sdata;
		};

include/net/9p/transport.h

+2 −8

Original line number	Diff line number	Diff line
		@@ -26,13 +26,6 @@
		#ifndef NET_9P_TRANSPORT_H
		#define NET_9P_TRANSPORT_H

		#define P9_TRANS_PREF_PAYLOAD_MASK 0x1

		/* Default. Add Payload to PDU before sending it down to transport layer */
		#define P9_TRANS_PREF_PAYLOAD_DEF 0x0
		/* Send pay load separately to transport layer along with PDU.*/
		#define P9_TRANS_PREF_PAYLOAD_SEP 0x1

		/**
		* struct p9_trans_module - transport module interface
		* @list: used to maintain a list of currently available transports
		@@ -56,13 +49,14 @@ struct p9_trans_module {
		struct list_head list;
		char name; / name of transport */
		int maxsize; /* max message size of transport */
		int pref; /* Preferences of this transport */
		int def; /* this transport should be default */
		struct module *owner;
		int (create)(struct p9_client , const char , char );
		void (close) (struct p9_client );
		int (request) (struct p9_client , struct p9_req_t *req);
		int (cancel) (struct p9_client , struct p9_req_t *req);
		int (zc_request)(struct p9_client , struct p9_req_t *,
		char , char , int , int, int, int);
		};

		void v9fs_register_trans(struct p9_trans_module *m);

net/9p/client.c

+291 −100

Original line number	Diff line number	Diff line
		@@ -203,11 +203,12 @@ free_and_return:
		*
		*/

		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, 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 */
		@@ -245,23 +246,12 @@ static struct p9_req_t p9_tag_alloc(struct p9_client c, u16 tag)
		return ERR_PTR(-ENOMEM);
		}
		init_waitqueue_head(req->wq);
		if ((c->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
		P9_TRANS_PREF_PAYLOAD_SEP) {
		int alloc_msize = min(c->msize, 4096);
		req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
		GFP_NOFS);
		req->tc->capacity = alloc_msize;
		req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
		GFP_NOFS);
		req->rc->capacity = alloc_msize;
		} else {
		req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
		GFP_NOFS);
		req->tc->capacity = c->msize;
		req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
		GFP_NOFS);
		req->rc->capacity = c->msize;
		}
		if ((!req->tc) \|\| (!req->rc)) {
		printk(KERN_ERR "Couldn't grow tag array\n");
		kfree(req->tc);
		@@ -485,25 +475,6 @@ static int p9_check_errors(struct p9_client c, struct p9_req_t req)

		if (!p9_is_proto_dotl(c)) {
		char *ename;

		if (req->tc->pbuf_size) {
		/* Handle user buffers */
		size_t len = req->rc->size - req->rc->offset;
		if (req->tc->pubuf) {
		/* User Buffer */
		err = copy_from_user(
		&req->rc->sdata[req->rc->offset],
		req->tc->pubuf, len);
		if (err) {
		err = -EFAULT;
		goto out_err;
		}
		} else {
		/* Kernel Buffer */
		memmove(&req->rc->sdata[req->rc->offset],
		req->tc->pkbuf, len);
		}
		}
		err = p9pdu_readf(req->rc, c->proto_version, "s?d",
		&ename, &ecode);
		if (err)
		@@ -515,11 +486,10 @@ static int p9_check_errors(struct p9_client c, struct p9_req_t req)
		if (!err \|\| !IS_ERR_VALUE(err)) {
		err = p9_errstr2errno(ename, strlen(ename));

		P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode,
		ename);

		kfree(ename);
		P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
		-ecode, ename);
		}
		kfree(ename);
		} else {
		err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
		err = -ecode;
		@@ -527,7 +497,6 @@ static int p9_check_errors(struct p9_client c, struct p9_req_t req)
		P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
		}


		return err;

		out_err:
		@@ -536,6 +505,110 @@ out_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);
		if (err) {
		P9_DPRINTK(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 */
		uint16_t len;
		/* 7 = header size for RERROR, 2 is the size of string len; */
		int inline_len = in_hdrlen - (7 + 2);

		/* Read the size of error string */
		err = p9pdu_readf(req->rc, c->proto_version, "w", &len);
		if (err)
		goto out_err;

		ename = kmalloc(len + 1, GFP_NOFS);
		if (!ename) {
		err = -ENOMEM;
		goto out_err;
		}
		if (len <= inline_len) {
		/* We have error in protocol buffer itself */
		if (pdu_read(req->rc, ename, len)) {
		err = -EFAULT;
		goto out_free;

		}
		} else {
		/*
		* Part of the data is in user space buffer.
		*/
		if (pdu_read(req->rc, ename, inline_len)) {
		err = -EFAULT;
		goto out_free;

		}
		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_free;
		}
		}
		}
		ename[len] = 0;
		if (p9_is_proto_dotu(c)) {
		/* For dotu we also have error code */
		err = p9pdu_readf(req->rc,
		c->proto_version, "d", &ecode);
		if (err)
		goto out_free;
		err = -ecode;
		}
		if (!err \|\| !IS_ERR_VALUE(err)) {
		err = p9_errstr2errno(ename, strlen(ename));

		P9_DPRINTK(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_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
		}
		return err;

		out_free:
		kfree(ename);
		out_err:
		P9_DPRINTK(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, ...);

		@@ -579,23 +652,12 @@ static int p9_client_flush(struct p9_client c, struct p9_req_t oldreq)
		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);

		@@ -607,12 +669,6 @@ p9_client_rpc(struct p9_client c, int8_t type, const char fmt, ...)
		if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
		return ERR_PTR(-EIO);

		if (signal_pending(current)) {
		sigpending = 1;
		clear_thread_flag(TIF_SIGPENDING);
		} else
		sigpending = 0;

		tag = P9_NOTAG;
		if (type != P9_TVERSION) {
		tag = p9_idpool_get(c->tagpool);
		@@ -620,18 +676,50 @@ 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);
		va_start(ap, fmt);
		err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
		va_end(ap);
		if (err)
		goto reterr;
		p9pdu_finalize(req->tc);
		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);
		req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
		va_end(ap);
		if (IS_ERR(req))
		return req;

		if (signal_pending(current)) {
		sigpending = 1;
		clear_thread_flag(TIF_SIGPENDING);
		} else
		sigpending = 0;

		err = c->trans_mod->request(c, req);
		if (err < 0) {
		@@ -639,18 +727,14 @@ p9_client_rpc(struct p9_client c, int8_t type, const char fmt, ...)
		c->status = Disconnected;
		goto reterr;
		}

		P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
		/* 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);

		if (req->status == REQ_STATUS_ERROR) {
		P9_DPRINTK(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");
		sigpending = 1;
		@@ -663,13 +747,11 @@ 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;

		@@ -678,7 +760,92 @@ p9_client_rpc(struct p9_client c, int8_t type, const char fmt, ...)
		P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
		return req;
		}
		reterr:
		P9_DPRINTK(P9_DEBUG_MUX,
		"exit: client %p op %d error: %d\n", c, type, err);
		p9_free_req(c, req);
		return ERR_PTR(err);
		}

		/**
		* 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_DPRINTK(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");
		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);
		if (!err) {
		P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
		return req;
		}
		reterr:
		P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
		err);
		@@ -1330,13 +1497,15 @@ int
		p9_client_read(struct p9_fid fid, char data, char __user *udata, u64 offset,
		u32 count)
		{
		int err, rsize;
		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_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
		fid->fid, (long long unsigned) offset, count);
		err = 0;
		clnt = fid->clnt;

		@@ -1348,11 +1517,22 @@ p9_client_read(struct p9_fid fid, char data, char __user *udata, u64 offset,
		rsize = count;

		/* Don't bother zerocopy for small IO (< 1024) */
		if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
		P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
		req = p9_client_rpc(clnt, P9_TREAD, "dqE", fid->fid, offset,
		rsize, data, udata);
		if (clnt->trans_mod->zc_request && rsize > 1024) {
		char *indata;
		if (data) {
		kernel_buf = 1;
		indata = data;
		} else
		indata = (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);
		}
		@@ -1370,7 +1550,7 @@ p9_client_read(struct p9_fid fid, char data, char __user *udata, u64 offset,
		P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
		P9_DUMP_PKT(1, req->rc);

		if (!req->tc->pbuf_size) {
		if (non_zc) {
		if (data) {
		memmove(data, dataptr, count);
		} else {
		@@ -1396,6 +1576,7 @@ p9_client_write(struct p9_fid fid, char data, const char __user *udata,
		u64 offset, u32 count)
		{
		int err, rsize;
		int kernel_buf = 0;
		struct p9_client *clnt;
		struct p9_req_t *req;

		@@ -1411,13 +1592,18 @@ p9_client_write(struct p9_fid fid, char data, const char __user *udata,
		if (count < rsize)
		rsize = count;

		/* Don't bother zerocopy form small IO (< 1024) */
		if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
		P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
		req = p9_client_rpc(clnt, P9_TWRITE, "dqE", fid->fid, offset,
		rsize, data, 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);
		@@ -1824,7 +2010,7 @@ EXPORT_SYMBOL_GPL(p9_client_xattrcreate);

		int p9_client_readdir(struct p9_fid fid, char data, u32 count, u64 offset)
		{
		int err, rsize;
		int err, rsize, non_zc = 0;
		struct p9_client *clnt;
		struct p9_req_t *req;
		char *dataptr;
		@@ -1842,11 +2028,16 @@ int p9_client_readdir(struct p9_fid fid, char data, u32 count, u64 offset)
		if (count < rsize)
		rsize = count;

		if ((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
		P9_TRANS_PREF_PAYLOAD_SEP) {
		req = p9_client_rpc(clnt, P9_TREADDIR, "dqF", fid->fid,
		offset, rsize, data);
		/* 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);
		}
		@@ -1863,7 +2054,7 @@ int p9_client_readdir(struct p9_fid fid, char data, u32 count, u64 offset)

		P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);

		if (!req->tc->pbuf_size && data)
		if (non_zc)
		memmove(data, dataptr, count);

		p9_free_req(clnt, req);

net/9p/protocol.c

+1 −45

Original line number	Diff line number	Diff line
		@@ -81,7 +81,7 @@ void p9stat_free(struct p9_wstat *stbuf)
		}
		EXPORT_SYMBOL(p9stat_free);

		static size_t pdu_read(struct p9_fcall pdu, void data, size_t size)
		size_t pdu_read(struct p9_fcall pdu, void data, size_t size)
		{
		size_t len = min(pdu->size - pdu->offset, size);
		memcpy(data, &pdu->sdata[pdu->offset], len);
		@@ -108,26 +108,6 @@ pdu_write_u(struct p9_fcall pdu, const char __user udata, size_t size)
		return size - len;
		}

		static size_t
		pdu_write_urw(struct p9_fcall pdu, const char kdata, const char __user *udata,
		size_t size)
		{
		BUG_ON(pdu->size > P9_IOHDRSZ);
		pdu->pubuf = (char __user *)udata;
		pdu->pkbuf = (char *)kdata;
		pdu->pbuf_size = size;
		return 0;
		}

		static size_t
		pdu_write_readdir(struct p9_fcall pdu, const char kdata, size_t size)
		{
		BUG_ON(pdu->size > P9_READDIRHDRSZ);
		pdu->pkbuf = (char *)kdata;
		pdu->pbuf_size = size;
		return 0;
		}

		/*
		b - int8_t
		w - int16_t
		@@ -459,26 +439,6 @@ p9pdu_vwritef(struct p9_fcall pdu, int proto_version, const char fmt,
		errcode = -EFAULT;
		}
		break;
		case 'E':{
		int32_t cnt = va_arg(ap, int32_t);
		const char k = va_arg(ap, const void );
		const char __user *u = va_arg(ap,
		const void __user *);
		errcode = p9pdu_writef(pdu, proto_version, "d",
		cnt);
		if (!errcode && pdu_write_urw(pdu, k, u, cnt))
		errcode = -EFAULT;
		}
		break;
		case 'F':{
		int32_t cnt = va_arg(ap, int32_t);
		const char k = va_arg(ap, const void );
		errcode = p9pdu_writef(pdu, proto_version, "d",
		cnt);
		if (!errcode && pdu_write_readdir(pdu, k, cnt))
		errcode = -EFAULT;
		}
		break;
		case 'U':{
		int32_t count = va_arg(ap, int32_t);
		const char __user *udata =
		@@ -637,10 +597,6 @@ void p9pdu_reset(struct p9_fcall *pdu)
		{
		pdu->offset = 0;
		pdu->size = 0;
		pdu->private = NULL;
		pdu->pubuf = NULL;
		pdu->pkbuf = NULL;
		pdu->pbuf_size = 0;
		}

		int p9dirent_read(char buf, int len, struct p9_dirent dirent,

net/9p/protocol.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -32,3 +32,4 @@ int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type);
		int p9pdu_finalize(struct p9_fcall *pdu);
		void p9pdu_dump(int, struct p9_fcall *);
		void p9pdu_reset(struct p9_fcall *pdu);
		size_t pdu_read(struct p9_fcall pdu, void data, size_t size);