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authorLatchesar Ionkov <lucho@ionkov.net>2007-07-10 17:57:28 -0500
committerEric Van Hensbergen <ericvh@ericvh-desktop.austin.ibm.com>2007-07-14 15:13:40 -0500
commitbd238fb431f31989898423c8b6496bc8c4204a86 (patch)
treef85a536383cbf360125ecb0592f6c515e0ecf0ff /net/9p/client.c
parent8d9107e8c50e1c4ff43c91c8841805833f3ecfb9 (diff)
downloadlinux-2.6.38-lt-ux500-bd238fb431f31989898423c8b6496bc8c4204a86.tar.gz
9p: Reorganization of 9p file system code
This patchset moves non-filesystem interfaces of v9fs from fs/9p to net/9p. It moves the transport, packet marshalling and connection layers to net/9p leaving only the VFS related files in fs/9p. This work is being done in preparation for in-kernel 9p servers as well as alternate 9p clients (other than VFS). Signed-off-by: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'net/9p/client.c')
-rw-r--r--net/9p/client.c965
1 files changed, 965 insertions, 0 deletions
diff --git a/net/9p/client.c b/net/9p/client.c
new file mode 100644
index 00000000000..bb2b8a3af19
--- /dev/null
+++ b/net/9p/client.c
@@ -0,0 +1,965 @@
+/*
+ * net/9p/clnt.c
+ *
+ * 9P Client
+ *
+ * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to:
+ * Free Software Foundation
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA 02111-1301 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/idr.h>
+#include <linux/mutex.h>
+#include <linux/sched.h>
+#include <linux/uaccess.h>
+#include <net/9p/9p.h>
+#include <net/9p/transport.h>
+#include <net/9p/conn.h>
+#include <net/9p/client.h>
+
+static struct p9_fid *p9_fid_create(struct p9_client *clnt);
+static void p9_fid_destroy(struct p9_fid *fid);
+static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu);
+
+struct p9_client *p9_client_create(struct p9_transport *trans, int msize,
+ int dotu)
+{
+ int err, n;
+ struct p9_client *clnt;
+ struct p9_fcall *tc, *rc;
+ struct p9_str *version;
+
+ err = 0;
+ tc = NULL;
+ rc = NULL;
+ clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
+ if (!clnt)
+ return ERR_PTR(-ENOMEM);
+
+ P9_DPRINTK(P9_DEBUG_9P, "clnt %p trans %p msize %d dotu %d\n",
+ clnt, trans, msize, dotu);
+ spin_lock_init(&clnt->lock);
+ clnt->trans = trans;
+ clnt->msize = msize;
+ clnt->dotu = dotu;
+ INIT_LIST_HEAD(&clnt->fidlist);
+ clnt->fidpool = p9_idpool_create();
+ if (!clnt->fidpool) {
+ err = PTR_ERR(clnt->fidpool);
+ clnt->fidpool = NULL;
+ goto error;
+ }
+
+ clnt->conn = p9_conn_create(clnt->trans, clnt->msize, &clnt->dotu);
+ if (IS_ERR(clnt->conn)) {
+ err = PTR_ERR(clnt->conn);
+ clnt->conn = NULL;
+ goto error;
+ }
+
+ tc = p9_create_tversion(clnt->msize, clnt->dotu?"9P2000.u":"9P2000");
+ if (IS_ERR(tc)) {
+ err = PTR_ERR(tc);
+ tc = NULL;
+ goto error;
+ }
+
+ err = p9_conn_rpc(clnt->conn, tc, &rc);
+ if (err)
+ goto error;
+
+ version = &rc->params.rversion.version;
+ if (version->len == 8 && !memcmp(version->str, "9P2000.u", 8))
+ clnt->dotu = 1;
+ else if (version->len == 6 && !memcmp(version->str, "9P2000", 6))
+ clnt->dotu = 0;
+ else {
+ err = -EREMOTEIO;
+ goto error;
+ }
+
+ n = rc->params.rversion.msize;
+ if (n < clnt->msize)
+ clnt->msize = n;
+
+ kfree(tc);
+ kfree(rc);
+ return clnt;
+
+error:
+ kfree(tc);
+ kfree(rc);
+ p9_client_destroy(clnt);
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL(p9_client_create);
+
+void p9_client_destroy(struct p9_client *clnt)
+{
+ struct p9_fid *fid, *fidptr;
+
+ P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
+ if (clnt->conn) {
+ p9_conn_destroy(clnt->conn);
+ clnt->conn = NULL;
+ }
+
+ if (clnt->trans) {
+ clnt->trans->close(clnt->trans);
+ kfree(clnt->trans);
+ clnt->trans = NULL;
+ }
+
+ if (clnt->fidpool)
+ p9_idpool_destroy(clnt->fidpool);
+
+ list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
+ p9_fid_destroy(fid);
+
+ kfree(clnt);
+}
+EXPORT_SYMBOL(p9_client_destroy);
+
+void p9_client_disconnect(struct p9_client *clnt)
+{
+ P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
+ clnt->trans->status = Disconnected;
+ p9_conn_cancel(clnt->conn, -EIO);
+}
+EXPORT_SYMBOL(p9_client_disconnect);
+
+struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
+ char *uname, char *aname)
+{
+ int err;
+ struct p9_fcall *tc, *rc;
+ struct p9_fid *fid;
+
+ P9_DPRINTK(P9_DEBUG_9P, "clnt %p afid %d uname %s aname %s\n",
+ clnt, afid?afid->fid:-1, uname, aname);
+ err = 0;
+ tc = NULL;
+ rc = NULL;
+
+ fid = p9_fid_create(clnt);
+ if (IS_ERR(fid)) {
+ err = PTR_ERR(fid);
+ fid = NULL;
+ goto error;
+ }
+
+ tc = p9_create_tattach(fid->fid, afid?afid->fid:P9_NOFID, uname, aname);
+ if (IS_ERR(tc)) {
+ err = PTR_ERR(tc);
+ tc = NULL;
+ goto error;
+ }
+
+ err = p9_conn_rpc(clnt->conn, tc, &rc);
+ if (err)
+ goto error;
+
+ memmove(&fid->qid, &rc->params.rattach.qid, sizeof(struct p9_qid));
+ kfree(tc);
+ kfree(rc);
+ return fid;
+
+error:
+ kfree(tc);
+ kfree(rc);
+ if (fid)
+ p9_fid_destroy(fid);
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL(p9_client_attach);
+
+struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname, char *aname)
+{
+ int err;
+ struct p9_fcall *tc, *rc;
+ struct p9_fid *fid;
+
+ P9_DPRINTK(P9_DEBUG_9P, "clnt %p uname %s aname %s\n", clnt, uname,
+ aname);
+ err = 0;
+ tc = NULL;
+ rc = NULL;
+
+ fid = p9_fid_create(clnt);
+ if (IS_ERR(fid)) {
+ err = PTR_ERR(fid);
+ fid = NULL;
+ goto error;
+ }
+
+ tc = p9_create_tauth(fid->fid, uname, aname);
+ if (IS_ERR(tc)) {
+ err = PTR_ERR(tc);
+ tc = NULL;
+ goto error;
+ }
+
+ err = p9_conn_rpc(clnt->conn, tc, &rc);
+ if (err)
+ goto error;
+
+ memmove(&fid->qid, &rc->params.rauth.qid, sizeof(struct p9_qid));
+ kfree(tc);
+ kfree(rc);
+ return fid;
+
+error:
+ kfree(tc);
+ kfree(rc);
+ if (fid)
+ p9_fid_destroy(fid);
+ 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)
+{
+ int err;
+ struct p9_fcall *tc, *rc;
+ struct p9_client *clnt;
+ struct p9_fid *fid;
+
+ P9_DPRINTK(P9_DEBUG_9P, "fid %d nwname %d wname[0] %s\n",
+ oldfid->fid, nwname, wnames?wnames[0]:NULL);
+ err = 0;
+ tc = NULL;
+ rc = NULL;
+ clnt = oldfid->clnt;
+ if (clone) {
+ fid = p9_fid_create(clnt);
+ if (IS_ERR(fid)) {
+ err = PTR_ERR(fid);
+ fid = NULL;
+ goto error;
+ }
+
+ fid->uid = oldfid->uid;
+ } else
+ fid = oldfid;
+
+ tc = p9_create_twalk(oldfid->fid, fid->fid, nwname, wnames);
+ if (IS_ERR(tc)) {
+ err = PTR_ERR(tc);
+ tc = NULL;
+ goto error;
+ }
+
+ err = p9_conn_rpc(clnt->conn, tc, &rc);
+ if (err) {
+ if (rc && rc->id == P9_RWALK)
+ goto clunk_fid;
+ else
+ goto error;
+ }
+
+ if (rc->params.rwalk.nwqid != nwname) {
+ err = -ENOENT;
+ goto clunk_fid;
+ }
+
+ if (nwname)
+ memmove(&fid->qid,
+ &rc->params.rwalk.wqids[rc->params.rwalk.nwqid - 1],
+ sizeof(struct p9_qid));
+ else
+ fid->qid = oldfid->qid;
+
+ kfree(tc);
+ kfree(rc);
+ return fid;
+
+clunk_fid:
+ kfree(tc);
+ kfree(rc);
+ rc = NULL;
+ tc = p9_create_tclunk(fid->fid);
+ if (IS_ERR(tc)) {
+ err = PTR_ERR(tc);
+ tc = NULL;
+ goto error;
+ }
+
+ p9_conn_rpc(clnt->conn, tc, &rc);
+
+error:
+ kfree(tc);
+ kfree(rc);
+ if (fid && (fid != oldfid))
+ p9_fid_destroy(fid);
+
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL(p9_client_walk);
+
+int p9_client_open(struct p9_fid *fid, int mode)
+{
+ int err;
+ struct p9_fcall *tc, *rc;
+ struct p9_client *clnt;
+
+ P9_DPRINTK(P9_DEBUG_9P, "fid %d mode %d\n", fid->fid, mode);
+ err = 0;
+ tc = NULL;
+ rc = NULL;
+ clnt = fid->clnt;
+
+ if (fid->mode != -1)
+ return -EINVAL;
+
+ tc = p9_create_topen(fid->fid, mode);
+ if (IS_ERR(tc)) {
+ err = PTR_ERR(tc);
+ tc = NULL;
+ goto done;
+ }
+
+ err = p9_conn_rpc(clnt->conn, tc, &rc);
+ if (err)
+ goto done;
+
+ fid->mode = mode;
+ fid->iounit = rc->params.ropen.iounit;
+
+done:
+ kfree(tc);
+ kfree(rc);
+ return err;
+}
+EXPORT_SYMBOL(p9_client_open);
+
+int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
+ char *extension)
+{
+ int err;
+ struct p9_fcall *tc, *rc;
+ struct p9_client *clnt;
+
+ P9_DPRINTK(P9_DEBUG_9P, "fid %d name %s perm %d mode %d\n", fid->fid,
+ name, perm, mode);
+ err = 0;
+ tc = NULL;
+ rc = NULL;
+ clnt = fid->clnt;
+
+ if (fid->mode != -1)
+ return -EINVAL;
+
+ tc = p9_create_tcreate(fid->fid, name, perm, mode, extension,
+ clnt->dotu);
+ if (IS_ERR(tc)) {
+ err = PTR_ERR(tc);
+ tc = NULL;
+ goto done;
+ }
+
+ err = p9_conn_rpc(clnt->conn, tc, &rc);
+ if (err)
+ goto done;
+
+ fid->mode = mode;
+ fid->iounit = rc->params.ropen.iounit;
+
+done:
+ kfree(tc);
+ kfree(rc);
+ return err;
+}
+EXPORT_SYMBOL(p9_client_fcreate);
+
+int p9_client_clunk(struct p9_fid *fid)
+{
+ int err;
+ struct p9_fcall *tc, *rc;
+ struct p9_client *clnt;
+
+ P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
+ err = 0;
+ tc = NULL;
+ rc = NULL;
+ clnt = fid->clnt;
+
+ tc = p9_create_tclunk(fid->fid);
+ if (IS_ERR(tc)) {
+ err = PTR_ERR(tc);
+ tc = NULL;
+ goto done;
+ }
+
+ err = p9_conn_rpc(clnt->conn, tc, &rc);
+ if (err)
+ goto done;
+
+ p9_fid_destroy(fid);
+
+done:
+ kfree(tc);
+ kfree(rc);
+ return err;
+}
+EXPORT_SYMBOL(p9_client_clunk);
+
+int p9_client_remove(struct p9_fid *fid)
+{
+ int err;
+ struct p9_fcall *tc, *rc;
+ struct p9_client *clnt;
+
+ P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
+ err = 0;
+ tc = NULL;
+ rc = NULL;
+ clnt = fid->clnt;
+
+ tc = p9_create_tremove(fid->fid);
+ if (IS_ERR(tc)) {
+ err = PTR_ERR(tc);
+ tc = NULL;
+ goto done;
+ }
+
+ err = p9_conn_rpc(clnt->conn, tc, &rc);
+ if (err)
+ goto done;
+
+ p9_fid_destroy(fid);
+
+done:
+ kfree(tc);
+ kfree(rc);
+ return err;
+}
+EXPORT_SYMBOL(p9_client_remove);
+
+int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count)
+{
+ int err, n, rsize, total;
+ struct p9_fcall *tc, *rc;
+ struct p9_client *clnt;
+
+ P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu %d\n", fid->fid,
+ (long long unsigned) offset, count);
+ err = 0;
+ tc = NULL;
+ rc = NULL;
+ clnt = fid->clnt;
+ total = 0;
+
+ rsize = fid->iounit;
+ if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
+ rsize = clnt->msize - P9_IOHDRSZ;
+
+ do {
+ if (count < rsize)
+ rsize = count;
+
+ tc = p9_create_tread(fid->fid, offset, rsize);
+ if (IS_ERR(tc)) {
+ err = PTR_ERR(tc);
+ tc = NULL;
+ goto error;
+ }
+
+ err = p9_conn_rpc(clnt->conn, tc, &rc);
+ if (err)
+ goto error;
+
+ n = rc->params.rread.count;
+ if (n > count)
+ n = count;
+
+ memmove(data, rc->params.rread.data, n);
+ count -= n;
+ data += n;
+ offset += n;
+ total += n;
+ kfree(tc);
+ tc = NULL;
+ kfree(rc);
+ rc = NULL;
+ } while (count > 0 && n == rsize);
+
+ return total;
+
+error:
+ kfree(tc);
+ kfree(rc);
+ return err;
+}
+EXPORT_SYMBOL(p9_client_read);
+
+int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count)
+{
+ int err, n, rsize, total;
+ struct p9_fcall *tc, *rc;
+ struct p9_client *clnt;
+
+ P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
+ (long long unsigned) offset, count);
+ err = 0;
+ tc = NULL;
+ rc = NULL;
+ clnt = fid->clnt;
+ total = 0;
+
+ rsize = fid->iounit;
+ if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
+ rsize = clnt->msize - P9_IOHDRSZ;
+
+ do {
+ if (count < rsize)
+ rsize = count;
+
+ tc = p9_create_twrite(fid->fid, offset, rsize, data);
+ if (IS_ERR(tc)) {
+ err = PTR_ERR(tc);
+ tc = NULL;
+ goto error;
+ }
+
+ err = p9_conn_rpc(clnt->conn, tc, &rc);
+ if (err)
+ goto error;
+
+ n = rc->params.rread.count;
+ count -= n;
+ data += n;
+ offset += n;
+ total += n;
+ kfree(tc);
+ tc = NULL;
+ kfree(rc);
+ rc = NULL;
+ } while (count > 0);
+
+ return total;
+
+error:
+ kfree(tc);
+ kfree(rc);
+ return err;
+}
+EXPORT_SYMBOL(p9_client_write);
+
+int
+p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset, u32 count)
+{
+ int err, n, rsize, total;
+ struct p9_fcall *tc, *rc;
+ struct p9_client *clnt;
+
+ P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
+ (long long unsigned) offset, count);
+ err = 0;
+ tc = NULL;
+ rc = NULL;
+ clnt = fid->clnt;
+ total = 0;
+
+ rsize = fid->iounit;
+ if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
+ rsize = clnt->msize - P9_IOHDRSZ;
+
+ do {
+ if (count < rsize)
+ rsize = count;
+
+ tc = p9_create_tread(fid->fid, offset, rsize);
+ if (IS_ERR(tc)) {
+ err = PTR_ERR(tc);
+ tc = NULL;
+ goto error;
+ }
+
+ err = p9_conn_rpc(clnt->conn, tc, &rc);
+ if (err)
+ goto error;
+
+ n = rc->params.rread.count;
+ if (n > count)
+ n = count;
+
+ err = copy_to_user(data, rc->params.rread.data, n);
+ if (err) {
+ err = -EFAULT;
+ goto error;
+ }
+
+ count -= n;
+ data += n;
+ offset += n;
+ total += n;
+ kfree(tc);
+ tc = NULL;
+ kfree(rc);
+ rc = NULL;
+ } while (count > 0 && n == rsize);
+
+ return total;
+
+error:
+ kfree(tc);
+ kfree(rc);
+ return err;
+}
+EXPORT_SYMBOL(p9_client_uread);
+
+int
+p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset,
+ u32 count)
+{
+ int err, n, rsize, total;
+ struct p9_fcall *tc, *rc;
+ struct p9_client *clnt;
+
+ P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
+ (long long unsigned) offset, count);
+ err = 0;
+ tc = NULL;
+ rc = NULL;
+ clnt = fid->clnt;
+ total = 0;
+
+ rsize = fid->iounit;
+ if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
+ rsize = clnt->msize - P9_IOHDRSZ;
+
+ do {
+ if (count < rsize)
+ rsize = count;
+
+ tc = p9_create_twrite_u(fid->fid, offset, rsize, data);
+ if (IS_ERR(tc)) {
+ err = PTR_ERR(tc);
+ tc = NULL;
+ goto error;
+ }
+
+ err = p9_conn_rpc(clnt->conn, tc, &rc);
+ if (err)
+ goto error;
+
+ n = rc->params.rread.count;
+ count -= n;
+ data += n;
+ offset += n;
+ total += n;
+ kfree(tc);
+ tc = NULL;
+ kfree(rc);
+ rc = NULL;
+ } while (count > 0);
+
+ return total;
+
+error:
+ kfree(tc);
+ kfree(rc);
+ return err;
+}
+EXPORT_SYMBOL(p9_client_uwrite);
+
+int p9_client_readn(struct p9_fid *fid, char *data, u64 offset, u32 count)
+{
+ int n, total;
+
+ P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
+ (long long unsigned) offset, count);
+ n = 0;
+ total = 0;
+ while (count) {
+ n = p9_client_read(fid, data, offset, count);
+ if (n <= 0)
+ break;
+
+ data += n;
+ offset += n;
+ count -= n;
+ total += n;
+ }
+
+ if (n < 0)
+ total = n;
+
+ return total;
+}
+EXPORT_SYMBOL(p9_client_readn);
+
+struct p9_stat *p9_client_stat(struct p9_fid *fid)
+{
+ int err;
+ struct p9_fcall *tc, *rc;
+ struct p9_client *clnt;
+ struct p9_stat *ret;
+
+ P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
+ err = 0;
+ tc = NULL;
+ rc = NULL;
+ ret = NULL;
+ clnt = fid->clnt;
+
+ tc = p9_create_tstat(fid->fid);
+ if (IS_ERR(tc)) {
+ err = PTR_ERR(tc);
+ tc = NULL;
+ goto error;
+ }
+
+ err = p9_conn_rpc(clnt->conn, tc, &rc);
+ if (err)
+ goto error;
+
+ ret = p9_clone_stat(&rc->params.rstat.stat, clnt->dotu);
+ if (IS_ERR(ret)) {
+ err = PTR_ERR(ret);
+ ret = NULL;
+ goto error;
+ }
+
+ kfree(tc);
+ kfree(rc);
+ return ret;
+
+error:
+ kfree(tc);
+ kfree(rc);
+ kfree(ret);
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL(p9_client_stat);
+
+int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
+{
+ int err;
+ struct p9_fcall *tc, *rc;
+ struct p9_client *clnt;
+
+ P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
+ err = 0;
+ tc = NULL;
+ rc = NULL;
+ clnt = fid->clnt;
+
+ tc = p9_create_twstat(fid->fid, wst, clnt->dotu);
+ if (IS_ERR(tc)) {
+ err = PTR_ERR(tc);
+ tc = NULL;
+ goto done;
+ }
+
+ err = p9_conn_rpc(clnt->conn, tc, &rc);
+
+done:
+ kfree(tc);
+ kfree(rc);
+ return err;
+}
+EXPORT_SYMBOL(p9_client_wstat);
+
+struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset)
+{
+ int err, n, m;
+ struct p9_fcall *tc, *rc;
+ struct p9_client *clnt;
+ struct p9_stat st, *ret;
+
+ P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu\n", fid->fid,
+ (long long unsigned) offset);
+ err = 0;
+ tc = NULL;
+ rc = NULL;
+ ret = NULL;
+ clnt = fid->clnt;
+
+ /* if the offset is below or above the current response, free it */
+ if (offset < fid->rdir_fpos || (fid->rdir_fcall &&
+ offset >= fid->rdir_fpos+fid->rdir_fcall->params.rread.count)) {
+ fid->rdir_pos = 0;
+ if (fid->rdir_fcall)
+ fid->rdir_fpos += fid->rdir_fcall->params.rread.count;
+
+ kfree(fid->rdir_fcall);
+ fid->rdir_fcall = NULL;
+ if (offset < fid->rdir_fpos)
+ fid->rdir_fpos = 0;
+ }
+
+ if (!fid->rdir_fcall) {
+ n = fid->iounit;
+ if (!n || n > clnt->msize-P9_IOHDRSZ)
+ n = clnt->msize - P9_IOHDRSZ;
+
+ while (1) {
+ if (fid->rdir_fcall) {
+ fid->rdir_fpos +=
+ fid->rdir_fcall->params.rread.count;
+ kfree(fid->rdir_fcall);
+ fid->rdir_fcall = NULL;
+ }
+
+ tc = p9_create_tread(fid->fid, fid->rdir_fpos, n);
+ if (IS_ERR(tc)) {
+ err = PTR_ERR(tc);
+ tc = NULL;
+ goto error;
+ }
+
+ err = p9_conn_rpc(clnt->conn, tc, &rc);
+ if (err)
+ goto error;
+
+ n = rc->params.rread.count;
+ if (n == 0)
+ goto done;
+
+ fid->rdir_fcall = rc;
+ rc = NULL;
+ if (offset >= fid->rdir_fpos &&
+ offset < fid->rdir_fpos+n)
+ break;
+ }
+
+ fid->rdir_pos = 0;
+ }
+
+ m = offset - fid->rdir_fpos;
+ if (m < 0)
+ goto done;
+
+ n = p9_deserialize_stat(fid->rdir_fcall->params.rread.data + m,
+ fid->rdir_fcall->params.rread.count - m, &st, clnt->dotu);
+
+ if (!n) {
+ err = -EIO;
+ goto error;
+ }
+
+ fid->rdir_pos += n;
+ st.size = n;
+ ret = p9_clone_stat(&st, clnt->dotu);
+ if (IS_ERR(ret)) {
+ err = PTR_ERR(ret);
+ ret = NULL;
+ goto error;
+ }
+
+done:
+ kfree(tc);
+ kfree(rc);
+ return ret;
+
+error:
+ kfree(tc);
+ kfree(rc);
+ kfree(ret);
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL(p9_client_dirread);
+
+static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu)
+{
+ int n;
+ char *p;
+ struct p9_stat *ret;
+
+ n = sizeof(struct p9_stat) + st->name.len + st->uid.len + st->gid.len +
+ st->muid.len;
+
+ if (dotu)
+ n += st->extension.len;
+
+ ret = kmalloc(n, GFP_KERNEL);
+ if (!ret)
+ return ERR_PTR(-ENOMEM);
+
+ memmove(ret, st, sizeof(struct p9_stat));
+ p = ((char *) ret) + sizeof(struct p9_stat);
+ memmove(p, st->name.str, st->name.len);
+ p += st->name.len;
+ memmove(p, st->uid.str, st->uid.len);
+ p += st->uid.len;
+ memmove(p, st->gid.str, st->gid.len);
+ p += st->gid.len;
+ memmove(p, st->muid.str, st->muid.len);
+ p += st->muid.len;
+
+ if (dotu) {
+ memmove(p, st->extension.str, st->extension.len);
+ p += st->extension.len;
+ }
+
+ return ret;
+}
+
+static struct p9_fid *p9_fid_create(struct p9_client *clnt)
+{
+ int err;
+ struct p9_fid *fid;
+
+ P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
+ fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
+ if (!fid)
+ return ERR_PTR(-ENOMEM);
+
+ fid->fid = p9_idpool_get(clnt->fidpool);
+ if (fid->fid < 0) {
+ err = -ENOSPC;
+ goto error;
+ }
+
+ memset(&fid->qid, 0, sizeof(struct p9_qid));
+ fid->mode = -1;
+ fid->rdir_fpos = 0;
+ fid->rdir_pos = 0;
+ fid->rdir_fcall = NULL;
+ fid->uid = current->fsuid;
+ fid->clnt = clnt;
+ fid->aux = NULL;
+
+ spin_lock(&clnt->lock);
+ list_add(&fid->flist, &clnt->fidlist);
+ spin_unlock(&clnt->lock);
+
+ return fid;
+
+error:
+ kfree(fid);
+ return ERR_PTR(err);
+}
+
+static void p9_fid_destroy(struct p9_fid *fid)
+{
+ struct p9_client *clnt;
+
+ P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
+ clnt = fid->clnt;
+ p9_idpool_put(fid->fid, clnt->fidpool);
+ spin_lock(&clnt->lock);
+ list_del(&fid->flist);
+ spin_unlock(&clnt->lock);
+ kfree(fid->rdir_fcall);
+ kfree(fid);
+}