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authorLinus Torvalds <torvalds@linux-foundation.org>2011-03-16 08:58:09 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-16 08:58:09 -0700
commit26a992dbc24e34cbdd03621d1c97ce571ad74e65 (patch)
treecbb3171eb715b7c1ed28ed3ca29f1f03165e2faa /net/9p
parentabab012a52237693ae48a655ece30cacb2ce4cf7 (diff)
parent7c9e592e1f6a994d2903c9b055e488ec90f58159 (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs: (46 commits) fs/9p: Make the writeback_fid owned by root fs/9p: Writeback dirty data before setattr fs/9p: call vmtruncate before setattr 9p opeation fs/9p: Properly update inode attributes on link fs/9p: Prevent multiple inclusion of same header fs/9p: Workaround vfs rename rehash bug fs/9p: Mark directory inode invalid for many directory inode operations fs/9p: Add . and .. dentry revalidation flag fs/9p: mark inode attribute invalid on rename, unlink and setattr fs/9p: Add support for marking inode attribute invalid fs/9p: Initialize root inode number for dotl fs/9p: Update link count correctly on different file system operations fs/9p: Add drop_inode 9p callback fs/9p: Add direct IO support in cached mode fs/9p: Fix inode i_size update in file_write fs/9p: set default readahead pages in cached mode fs/9p: Move writeback fid to v9fs_inode fs/9p: Add v9fs_inode fs/9p: Don't set stat.st_blocks based on nrpages fs/9p: Add inode hashing ...
Diffstat (limited to 'net/9p')
-rw-r--r--net/9p/Makefile1
-rw-r--r--net/9p/client.c166
-rw-r--r--net/9p/protocol.c44
-rw-r--r--net/9p/trans_common.c97
-rw-r--r--net/9p/trans_common.h32
-rw-r--r--net/9p/trans_virtio.c129
6 files changed, 419 insertions, 50 deletions
diff --git a/net/9p/Makefile b/net/9p/Makefile
index 198a640d53a..a0874cc1f71 100644
--- a/net/9p/Makefile
+++ b/net/9p/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_NET_9P_RDMA) += 9pnet_rdma.o
util.o \
protocol.o \
trans_fd.o \
+ trans_common.o \
9pnet_virtio-objs := \
trans_virtio.o \
diff --git a/net/9p/client.c b/net/9p/client.c
index a848bca9fbf..347ec0cd271 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -229,10 +229,23 @@ static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
return ERR_PTR(-ENOMEM);
}
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 ((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_KERNEL);
+ req->tc->capacity = alloc_msize;
+ req->rc = kmalloc(sizeof(struct p9_fcall)+alloc_msize,
+ GFP_KERNEL);
+ req->rc->capacity = alloc_msize;
+ } else {
+ req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
+ GFP_KERNEL);
+ req->tc->capacity = c->msize;
+ req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
+ GFP_KERNEL);
+ req->rc->capacity = c->msize;
+ }
if ((!req->tc) || (!req->rc)) {
printk(KERN_ERR "Couldn't grow tag array\n");
kfree(req->tc);
@@ -243,9 +256,7 @@ static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
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;
}
p9pdu_reset(req->tc);
@@ -443,6 +454,7 @@ 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);
if (err) {
@@ -450,36 +462,53 @@ static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
return err;
}
- if (type == P9_RERROR || type == P9_RLERROR) {
- int ecode;
-
- if (!p9_is_proto_dotl(c)) {
- char *ename;
+ if (type != P9_RERROR && type != P9_RLERROR)
+ return 0;
- err = p9pdu_readf(req->rc, c->proto_version, "s?d",
- &ename, &ecode);
- if (err)
- goto out_err;
+ 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)
+ goto out_err;
- if (p9_is_proto_dotu(c))
- err = -ecode;
+ if (p9_is_proto_dotu(c))
+ err = -ecode;
- if (!err || !IS_ERR_VALUE(err)) {
- err = p9_errstr2errno(ename, strlen(ename));
+ if (!err || !IS_ERR_VALUE(err)) {
+ err = p9_errstr2errno(ename, strlen(ename));
- P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, 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);
+ kfree(ename);
}
+ } else {
+ err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
+ err = -ecode;
+
+ P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
+ }
- } else
- err = 0;
return err;
@@ -1191,6 +1220,27 @@ error:
}
EXPORT_SYMBOL(p9_client_fsync);
+int p9_client_sync_fs(struct p9_fid *fid)
+{
+ int err = 0;
+ struct p9_req_t *req;
+ struct p9_client *clnt;
+
+ P9_DPRINTK(P9_DEBUG_9P, ">>> TSYNC_FS fid %d\n", fid->fid);
+
+ clnt = fid->clnt;
+ req = p9_client_rpc(clnt, P9_TSYNCFS, "d", fid->fid);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto error;
+ }
+ P9_DPRINTK(P9_DEBUG_9P, "<<< RSYNCFS fid %d\n", fid->fid);
+ p9_free_req(clnt, req);
+error:
+ return err;
+}
+EXPORT_SYMBOL(p9_client_sync_fs);
+
int p9_client_clunk(struct p9_fid *fid)
{
int err;
@@ -1270,7 +1320,15 @@ 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 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_TREAD, "dqE", fid->fid, offset,
+ rsize, data, udata);
+ } else {
+ req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
+ rsize);
+ }
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
@@ -1284,13 +1342,15 @@ p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
- if (data) {
- memmove(data, dataptr, count);
- } else {
- err = copy_to_user(udata, dataptr, count);
- if (err) {
- err = -EFAULT;
- goto free_and_error;
+ if (!req->tc->pbuf_size) {
+ 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);
@@ -1323,12 +1383,21 @@ 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 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);
+ } 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;
@@ -1716,7 +1785,14 @@ int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
if (count < rsize)
rsize = count;
- req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, offset, rsize);
+ 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);
+ } else {
+ req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
+ offset, rsize);
+ }
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
@@ -1730,7 +1806,7 @@ 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 (data)
+ if (!req->tc->pbuf_size && data)
memmove(data, dataptr, count);
p9_free_req(clnt, req);
diff --git a/net/9p/protocol.c b/net/9p/protocol.c
index 1e308f21092..2ce515b859b 100644
--- a/net/9p/protocol.c
+++ b/net/9p/protocol.c
@@ -114,6 +114,26 @@ 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
@@ -445,6 +465,25 @@ 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 *u = va_arg(ap, const void *);
+ 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 =
@@ -579,6 +618,7 @@ EXPORT_SYMBOL(p9stat_read);
int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type)
{
+ pdu->id = type;
return p9pdu_writef(pdu, 0, "dbw", 0, type, tag);
}
@@ -606,6 +646,10 @@ 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,
diff --git a/net/9p/trans_common.c b/net/9p/trans_common.c
new file mode 100644
index 00000000000..d62b9aa58df
--- /dev/null
+++ b/net/9p/trans_common.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright IBM Corporation, 2010
+ * Author Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <net/9p/9p.h>
+#include <net/9p/client.h>
+#include <linux/scatterlist.h>
+#include "trans_common.h"
+
+/**
+ * p9_release_req_pages - Release pages after the transaction.
+ * @*private: PDU's private page of struct trans_rpage_info
+ */
+void
+p9_release_req_pages(struct trans_rpage_info *rpinfo)
+{
+ int i = 0;
+
+ while (rpinfo->rp_data[i] && rpinfo->rp_nr_pages--) {
+ put_page(rpinfo->rp_data[i]);
+ i++;
+ }
+}
+EXPORT_SYMBOL(p9_release_req_pages);
+
+/**
+ * p9_nr_pages - Return number of pages needed to accomodate the payload.
+ */
+int
+p9_nr_pages(struct p9_req_t *req)
+{
+ int start_page, end_page;
+ start_page = (unsigned long long)req->tc->pubuf >> PAGE_SHIFT;
+ end_page = ((unsigned long long)req->tc->pubuf + req->tc->pbuf_size +
+ PAGE_SIZE - 1) >> PAGE_SHIFT;
+ return end_page - start_page;
+}
+EXPORT_SYMBOL(p9_nr_pages);
+
+/**
+ * payload_gup - Translates user buffer into kernel pages and
+ * pins them either for read/write through get_user_pages_fast().
+ * @req: Request to be sent to server.
+ * @pdata_off: data offset into the first page after translation (gup).
+ * @pdata_len: Total length of the IO. gup may not return requested # of pages.
+ * @nr_pages: number of pages to accomodate the payload
+ * @rw: Indicates if the pages are for read or write.
+ */
+int
+p9_payload_gup(struct p9_req_t *req, size_t *pdata_off, int *pdata_len,
+ int nr_pages, u8 rw)
+{
+ uint32_t first_page_bytes = 0;
+ uint32_t pdata_mapped_pages;
+ struct trans_rpage_info *rpinfo;
+
+ *pdata_off = (size_t)req->tc->pubuf & (PAGE_SIZE-1);
+
+ if (*pdata_off)
+ first_page_bytes = min((PAGE_SIZE - *pdata_off),
+ req->tc->pbuf_size);
+
+ rpinfo = req->tc->private;
+ pdata_mapped_pages = get_user_pages_fast((unsigned long)req->tc->pubuf,
+ nr_pages, rw, &rpinfo->rp_data[0]);
+
+ if (pdata_mapped_pages < 0) {
+ printk(KERN_ERR "get_user_pages_fast failed:%d udata:%p"
+ "nr_pages:%d\n", pdata_mapped_pages,
+ req->tc->pubuf, nr_pages);
+ pdata_mapped_pages = 0;
+ return -EIO;
+ }
+ rpinfo->rp_nr_pages = pdata_mapped_pages;
+ if (*pdata_off) {
+ *pdata_len = first_page_bytes;
+ *pdata_len += min((req->tc->pbuf_size - *pdata_len),
+ ((size_t)pdata_mapped_pages - 1) << PAGE_SHIFT);
+ } else {
+ *pdata_len = min(req->tc->pbuf_size,
+ (size_t)pdata_mapped_pages << PAGE_SHIFT);
+ }
+ return 0;
+}
+EXPORT_SYMBOL(p9_payload_gup);
diff --git a/net/9p/trans_common.h b/net/9p/trans_common.h
new file mode 100644
index 00000000000..76309223bb0
--- /dev/null
+++ b/net/9p/trans_common.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright IBM Corporation, 2010
+ * Author Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+/* TRUE if it is user context */
+#define P9_IS_USER_CONTEXT (!segment_eq(get_fs(), KERNEL_DS))
+
+/**
+ * struct trans_rpage_info - To store mapped page information in PDU.
+ * @rp_alloc:Set if this structure is allocd, not a reuse unused space in pdu.
+ * @rp_nr_pages: Number of mapped pages
+ * @rp_data: Array of page pointers
+ */
+struct trans_rpage_info {
+ u8 rp_alloc;
+ int rp_nr_pages;
+ struct page *rp_data[0];
+};
+
+void p9_release_req_pages(struct trans_rpage_info *);
+int p9_payload_gup(struct p9_req_t *, size_t *, int *, int, u8);
+int p9_nr_pages(struct p9_req_t *);
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index c8f3f72ab20..9b550ed9c71 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -45,6 +45,7 @@
#include <linux/scatterlist.h>
#include <linux/virtio.h>
#include <linux/virtio_9p.h>
+#include "trans_common.h"
#define VIRTQUEUE_NUM 128
@@ -155,6 +156,14 @@ static void req_done(struct virtqueue *vq)
rc->tag);
req = p9_tag_lookup(chan->client, rc->tag);
req->status = REQ_STATUS_RCVD;
+ if (req->tc->private) {
+ struct trans_rpage_info *rp = req->tc->private;
+ /*Release pages */
+ p9_release_req_pages(rp);
+ if (rp->rp_alloc)
+ kfree(rp);
+ req->tc->private = NULL;
+ }
p9_client_cb(chan->client, req);
} else {
spin_unlock_irqrestore(&chan->lock, flags);
@@ -203,6 +212,38 @@ static int p9_virtio_cancel(struct p9_client *client, struct p9_req_t *req)
}
/**
+ * pack_sg_list_p - Just like pack_sg_list. Instead of taking a buffer,
+ * this takes a list of pages.
+ * @sg: scatter/gather list to pack into
+ * @start: which segment of the sg_list to start at
+ * @pdata_off: Offset into the first page
+ * @**pdata: a list of pages to add into sg.
+ * @count: amount of data to pack into the scatter/gather list
+ */
+static int
+pack_sg_list_p(struct scatterlist *sg, int start, int limit, size_t pdata_off,
+ struct page **pdata, int count)
+{
+ int s;
+ int i = 0;
+ int index = start;
+
+ if (pdata_off) {
+ s = min((int)(PAGE_SIZE - pdata_off), count);
+ sg_set_page(&sg[index++], pdata[i++], s, pdata_off);
+ count -= s;
+ }
+
+ while (count) {
+ BUG_ON(index > limit);
+ s = min((int)PAGE_SIZE, count);
+ sg_set_page(&sg[index++], pdata[i++], s, 0);
+ count -= s;
+ }
+ return index-start;
+}
+
+/**
* p9_virtio_request - issue a request
* @client: client instance issuing the request
* @req: request to be issued
@@ -212,22 +253,97 @@ static int p9_virtio_cancel(struct p9_client *client, struct p9_req_t *req)
static int
p9_virtio_request(struct p9_client *client, struct p9_req_t *req)
{
- int in, out;
+ int in, out, inp, outp;
struct virtio_chan *chan = client->trans;
char *rdata = (char *)req->rc+sizeof(struct p9_fcall);
unsigned long flags;
- int err;
+ size_t pdata_off = 0;
+ struct trans_rpage_info *rpinfo = NULL;
+ int err, pdata_len = 0;
P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio request\n");
req_retry:
req->status = REQ_STATUS_SENT;
+ if (req->tc->pbuf_size && (req->tc->pubuf && P9_IS_USER_CONTEXT)) {
+ int nr_pages = p9_nr_pages(req);
+ int rpinfo_size = sizeof(struct trans_rpage_info) +
+ sizeof(struct page *) * nr_pages;
+
+ if (rpinfo_size <= (req->tc->capacity - req->tc->size)) {
+ /* We can use sdata */
+ req->tc->private = req->tc->sdata + req->tc->size;
+ rpinfo = (struct trans_rpage_info *)req->tc->private;
+ rpinfo->rp_alloc = 0;
+ } else {
+ req->tc->private = kmalloc(rpinfo_size, GFP_NOFS);
+ if (!req->tc->private) {
+ P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: "
+ "private kmalloc returned NULL");
+ return -ENOMEM;
+ }
+ rpinfo = (struct trans_rpage_info *)req->tc->private;
+ rpinfo->rp_alloc = 1;
+ }
+
+ err = p9_payload_gup(req, &pdata_off, &pdata_len, nr_pages,
+ req->tc->id == P9_TREAD ? 1 : 0);
+ if (err < 0) {
+ if (rpinfo->rp_alloc)
+ kfree(rpinfo);
+ return err;
+ }
+ }
+
spin_lock_irqsave(&chan->lock, flags);
+
+ /* Handle out VirtIO ring buffers */
out = pack_sg_list(chan->sg, 0, VIRTQUEUE_NUM, req->tc->sdata,
- req->tc->size);
- in = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM-out, rdata,
- client->msize);
+ req->tc->size);
+
+ if (req->tc->pbuf_size && (req->tc->id == P9_TWRITE)) {
+ /* We have additional write payload buffer to take care */
+ if (req->tc->pubuf && P9_IS_USER_CONTEXT) {
+ outp = pack_sg_list_p(chan->sg, out, VIRTQUEUE_NUM,
+ pdata_off, rpinfo->rp_data, pdata_len);
+ } else {
+ char *pbuf = req->tc->pubuf ? req->tc->pubuf :
+ req->tc->pkbuf;
+ outp = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM, pbuf,
+ req->tc->pbuf_size);
+ }
+ out += outp;
+ }
+
+ /* Handle in VirtIO ring buffers */
+ if (req->tc->pbuf_size &&
+ ((req->tc->id == P9_TREAD) || (req->tc->id == P9_TREADDIR))) {
+ /*
+ * Take care of additional Read payload.
+ * 11 is the read/write header = PDU Header(7) + IO Size (4).
+ * Arrange in such a way that server places header in the
+ * alloced memory and payload onto the user buffer.
+ */
+ inp = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM, rdata, 11);
+ /*
+ * Running executables in the filesystem may result in
+ * a read request with kernel buffer as opposed to user buffer.
+ */
+ if (req->tc->pubuf && P9_IS_USER_CONTEXT) {
+ in = pack_sg_list_p(chan->sg, out+inp, VIRTQUEUE_NUM,
+ pdata_off, rpinfo->rp_data, pdata_len);
+ } else {
+ char *pbuf = req->tc->pubuf ? req->tc->pubuf :
+ req->tc->pkbuf;
+ in = pack_sg_list(chan->sg, out+inp, VIRTQUEUE_NUM,
+ pbuf, req->tc->pbuf_size);
+ }
+ in += inp;
+ } else {
+ in = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM, rdata,
+ client->msize);
+ }
err = virtqueue_add_buf(chan->vq, chan->sg, out, in, req->tc);
if (err < 0) {
@@ -246,6 +362,8 @@ req_retry:
P9_DPRINTK(P9_DEBUG_TRANS,
"9p debug: "
"virtio rpc add_buf returned failure");
+ if (rpinfo && rpinfo->rp_alloc)
+ kfree(rpinfo);
return -EIO;
}
}
@@ -448,6 +566,7 @@ static struct p9_trans_module p9_virtio_trans = {
.request = p9_virtio_request,
.cancel = p9_virtio_cancel,
.maxsize = PAGE_SIZE*16,
+ .pref = P9_TRANS_PREF_PAYLOAD_SEP,
.def = 0,
.owner = THIS_MODULE,
};