+++ /dev/null
-/*
- * net/9p/conv.c
- *
- * 9P protocol conversion functions
- *
- * Copyright (C) 2004, 2005 by Latchesar Ionkov <lucho@ionkov.net>
- * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
- * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
- *
- * 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/sched.h>
-#include <linux/idr.h>
-#include <linux/uaccess.h>
-#include <net/9p/9p.h>
-
-/*
- * Buffer to help with string parsing
- */
-struct cbuf {
- unsigned char *sp;
- unsigned char *p;
- unsigned char *ep;
-};
-
-static inline void buf_init(struct cbuf *buf, void *data, int datalen)
-{
- buf->sp = buf->p = data;
- buf->ep = data + datalen;
-}
-
-static inline int buf_check_overflow(struct cbuf *buf)
-{
- return buf->p > buf->ep;
-}
-
-static int buf_check_size(struct cbuf *buf, int len)
-{
- if (buf->p + len > buf->ep) {
- if (buf->p < buf->ep) {
- P9_EPRINTK(KERN_ERR,
- "buffer overflow: want %d has %d\n", len,
- (int)(buf->ep - buf->p));
- dump_stack();
- buf->p = buf->ep + 1;
- }
-
- return 0;
- }
-
- return 1;
-}
-
-static void *buf_alloc(struct cbuf *buf, int len)
-{
- void *ret = NULL;
-
- if (buf_check_size(buf, len)) {
- ret = buf->p;
- buf->p += len;
- }
-
- return ret;
-}
-
-static void buf_put_int8(struct cbuf *buf, u8 val)
-{
- if (buf_check_size(buf, 1)) {
- buf->p[0] = val;
- buf->p++;
- }
-}
-
-static void buf_put_int16(struct cbuf *buf, u16 val)
-{
- if (buf_check_size(buf, 2)) {
- *(__le16 *) buf->p = cpu_to_le16(val);
- buf->p += 2;
- }
-}
-
-static void buf_put_int32(struct cbuf *buf, u32 val)
-{
- if (buf_check_size(buf, 4)) {
- *(__le32 *)buf->p = cpu_to_le32(val);
- buf->p += 4;
- }
-}
-
-static void buf_put_int64(struct cbuf *buf, u64 val)
-{
- if (buf_check_size(buf, 8)) {
- *(__le64 *)buf->p = cpu_to_le64(val);
- buf->p += 8;
- }
-}
-
-static char *buf_put_stringn(struct cbuf *buf, const char *s, u16 slen)
-{
- char *ret;
-
- ret = NULL;
- if (buf_check_size(buf, slen + 2)) {
- buf_put_int16(buf, slen);
- ret = buf->p;
- memcpy(buf->p, s, slen);
- buf->p += slen;
- }
-
- return ret;
-}
-
-static u8 buf_get_int8(struct cbuf *buf)
-{
- u8 ret = 0;
-
- if (buf_check_size(buf, 1)) {
- ret = buf->p[0];
- buf->p++;
- }
-
- return ret;
-}
-
-static u16 buf_get_int16(struct cbuf *buf)
-{
- u16 ret = 0;
-
- if (buf_check_size(buf, 2)) {
- ret = le16_to_cpu(*(__le16 *)buf->p);
- buf->p += 2;
- }
-
- return ret;
-}
-
-static u32 buf_get_int32(struct cbuf *buf)
-{
- u32 ret = 0;
-
- if (buf_check_size(buf, 4)) {
- ret = le32_to_cpu(*(__le32 *)buf->p);
- buf->p += 4;
- }
-
- return ret;
-}
-
-static u64 buf_get_int64(struct cbuf *buf)
-{
- u64 ret = 0;
-
- if (buf_check_size(buf, 8)) {
- ret = le64_to_cpu(*(__le64 *)buf->p);
- buf->p += 8;
- }
-
- return ret;
-}
-
-static void buf_get_str(struct cbuf *buf, struct p9_str *vstr)
-{
- vstr->len = buf_get_int16(buf);
- if (!buf_check_overflow(buf) && buf_check_size(buf, vstr->len)) {
- vstr->str = buf->p;
- buf->p += vstr->len;
- } else {
- vstr->len = 0;
- vstr->str = NULL;
- }
-}
-
-static void buf_get_qid(struct cbuf *bufp, struct p9_qid *qid)
-{
- qid->type = buf_get_int8(bufp);
- qid->version = buf_get_int32(bufp);
- qid->path = buf_get_int64(bufp);
-}
-
-/**
- * p9_size_wstat - calculate the size of a variable length stat struct
- * @wstat: metadata (stat) structure
- * @dotu: non-zero if 9P2000.u
- *
- */
-
-static int p9_size_wstat(struct p9_wstat *wstat, int dotu)
-{
- int size = 0;
-
- if (wstat == NULL) {
- P9_EPRINTK(KERN_ERR, "p9_size_stat: got a NULL stat pointer\n");
- return 0;
- }
-
- size = /* 2 + *//* size[2] */
- 2 + /* type[2] */
- 4 + /* dev[4] */
- 1 + /* qid.type[1] */
- 4 + /* qid.vers[4] */
- 8 + /* qid.path[8] */
- 4 + /* mode[4] */
- 4 + /* atime[4] */
- 4 + /* mtime[4] */
- 8 + /* length[8] */
- 8; /* minimum sum of string lengths */
-
- if (wstat->name)
- size += strlen(wstat->name);
- if (wstat->uid)
- size += strlen(wstat->uid);
- if (wstat->gid)
- size += strlen(wstat->gid);
- if (wstat->muid)
- size += strlen(wstat->muid);
-
- if (dotu) {
- size += 4 + /* n_uid[4] */
- 4 + /* n_gid[4] */
- 4 + /* n_muid[4] */
- 2; /* string length of extension[4] */
- if (wstat->extension)
- size += strlen(wstat->extension);
- }
-
- return size;
-}
-
-/**
- * buf_get_stat - safely decode a recieved metadata (stat) structure
- * @bufp: buffer to deserialize
- * @stat: metadata (stat) structure
- * @dotu: non-zero if 9P2000.u
- *
- */
-
-static void
-buf_get_stat(struct cbuf *bufp, struct p9_stat *stat, int dotu)
-{
- stat->size = buf_get_int16(bufp);
- stat->type = buf_get_int16(bufp);
- stat->dev = buf_get_int32(bufp);
- stat->qid.type = buf_get_int8(bufp);
- stat->qid.version = buf_get_int32(bufp);
- stat->qid.path = buf_get_int64(bufp);
- stat->mode = buf_get_int32(bufp);
- stat->atime = buf_get_int32(bufp);
- stat->mtime = buf_get_int32(bufp);
- stat->length = buf_get_int64(bufp);
- buf_get_str(bufp, &stat->name);
- buf_get_str(bufp, &stat->uid);
- buf_get_str(bufp, &stat->gid);
- buf_get_str(bufp, &stat->muid);
-
- if (dotu) {
- buf_get_str(bufp, &stat->extension);
- stat->n_uid = buf_get_int32(bufp);
- stat->n_gid = buf_get_int32(bufp);
- stat->n_muid = buf_get_int32(bufp);
- }
-}
-
-/**
- * p9_deserialize_stat - decode a received metadata structure
- * @buf: buffer to deserialize
- * @buflen: length of received buffer
- * @stat: metadata structure to decode into
- * @dotu: non-zero if 9P2000.u
- *
- * Note: stat will point to the buf region.
- */
-
-int
-p9_deserialize_stat(void *buf, u32 buflen, struct p9_stat *stat,
- int dotu)
-{
- struct cbuf buffer;
- struct cbuf *bufp = &buffer;
- unsigned char *p;
-
- buf_init(bufp, buf, buflen);
- p = bufp->p;
- buf_get_stat(bufp, stat, dotu);
-
- if (buf_check_overflow(bufp))
- return 0;
- else
- return bufp->p - p;
-}
-EXPORT_SYMBOL(p9_deserialize_stat);
-
-/**
- * deserialize_fcall - unmarshal a response
- * @buf: recieved buffer
- * @buflen: length of received buffer
- * @rcall: fcall structure to populate
- * @rcalllen: length of fcall structure to populate
- * @dotu: non-zero if 9P2000.u
- *
- */
-
-int
-p9_deserialize_fcall(void *buf, u32 buflen, struct p9_fcall *rcall,
- int dotu)
-{
-
- struct cbuf buffer;
- struct cbuf *bufp = &buffer;
- int i = 0;
-
- buf_init(bufp, buf, buflen);
-
- rcall->size = buf_get_int32(bufp);
- rcall->id = buf_get_int8(bufp);
- rcall->tag = buf_get_int16(bufp);
-
- P9_DPRINTK(P9_DEBUG_CONV, "size %d id %d tag %d\n", rcall->size,
- rcall->id, rcall->tag);
-
- switch (rcall->id) {
- default:
- P9_EPRINTK(KERN_ERR, "unknown message type: %d\n", rcall->id);
- return -EPROTO;
- case P9_RVERSION:
- rcall->params.rversion.msize = buf_get_int32(bufp);
- buf_get_str(bufp, &rcall->params.rversion.version);
- break;
- case P9_RFLUSH:
- break;
- case P9_RATTACH:
- rcall->params.rattach.qid.type = buf_get_int8(bufp);
- rcall->params.rattach.qid.version = buf_get_int32(bufp);
- rcall->params.rattach.qid.path = buf_get_int64(bufp);
- break;
- case P9_RWALK:
- rcall->params.rwalk.nwqid = buf_get_int16(bufp);
- if (rcall->params.rwalk.nwqid > P9_MAXWELEM) {
- P9_EPRINTK(KERN_ERR,
- "Rwalk with more than %d qids: %d\n",
- P9_MAXWELEM, rcall->params.rwalk.nwqid);
- return -EPROTO;
- }
-
- for (i = 0; i < rcall->params.rwalk.nwqid; i++)
- buf_get_qid(bufp, &rcall->params.rwalk.wqids[i]);
- break;
- case P9_ROPEN:
- buf_get_qid(bufp, &rcall->params.ropen.qid);
- rcall->params.ropen.iounit = buf_get_int32(bufp);
- break;
- case P9_RCREATE:
- buf_get_qid(bufp, &rcall->params.rcreate.qid);
- rcall->params.rcreate.iounit = buf_get_int32(bufp);
- break;
- case P9_RREAD:
- rcall->params.rread.count = buf_get_int32(bufp);
- rcall->params.rread.data = bufp->p;
- buf_check_size(bufp, rcall->params.rread.count);
- break;
- case P9_RWRITE:
- rcall->params.rwrite.count = buf_get_int32(bufp);
- break;
- case P9_RCLUNK:
- break;
- case P9_RREMOVE:
- break;
- case P9_RSTAT:
- buf_get_int16(bufp);
- buf_get_stat(bufp, &rcall->params.rstat.stat, dotu);
- break;
- case P9_RWSTAT:
- break;
- case P9_RERROR:
- buf_get_str(bufp, &rcall->params.rerror.error);
- if (dotu)
- rcall->params.rerror.errno = buf_get_int16(bufp);
- break;
- }
-
- if (buf_check_overflow(bufp)) {
- P9_DPRINTK(P9_DEBUG_ERROR, "buffer overflow\n");
- return -EIO;
- }
-
- return bufp->p - bufp->sp;
-}
-EXPORT_SYMBOL(p9_deserialize_fcall);
-
-static inline void p9_put_int8(struct cbuf *bufp, u8 val, u8 * p)
-{
- *p = val;
- buf_put_int8(bufp, val);
-}
-
-static inline void p9_put_int16(struct cbuf *bufp, u16 val, u16 * p)
-{
- *p = val;
- buf_put_int16(bufp, val);
-}
-
-static inline void p9_put_int32(struct cbuf *bufp, u32 val, u32 * p)
-{
- *p = val;
- buf_put_int32(bufp, val);
-}
-
-static inline void p9_put_int64(struct cbuf *bufp, u64 val, u64 * p)
-{
- *p = val;
- buf_put_int64(bufp, val);
-}
-
-static void
-p9_put_str(struct cbuf *bufp, char *data, struct p9_str *str)
-{
- int len;
- char *s;
-
- if (data)
- len = strlen(data);
- else
- len = 0;
-
- s = buf_put_stringn(bufp, data, len);
- if (str) {
- str->len = len;
- str->str = s;
- }
-}
-
-static int
-p9_put_data(struct cbuf *bufp, const char *data, int count,
- unsigned char **pdata)
-{
- *pdata = buf_alloc(bufp, count);
- if (*pdata == NULL)
- return -ENOMEM;
- memmove(*pdata, data, count);
- return 0;
-}
-
-static int
-p9_put_user_data(struct cbuf *bufp, const char __user *data, int count,
- unsigned char **pdata)
-{
- *pdata = buf_alloc(bufp, count);
- if (*pdata == NULL)
- return -ENOMEM;
- return copy_from_user(*pdata, data, count);
-}
-
-static void
-p9_put_wstat(struct cbuf *bufp, struct p9_wstat *wstat,
- struct p9_stat *stat, int statsz, int dotu)
-{
- p9_put_int16(bufp, statsz, &stat->size);
- p9_put_int16(bufp, wstat->type, &stat->type);
- p9_put_int32(bufp, wstat->dev, &stat->dev);
- p9_put_int8(bufp, wstat->qid.type, &stat->qid.type);
- p9_put_int32(bufp, wstat->qid.version, &stat->qid.version);
- p9_put_int64(bufp, wstat->qid.path, &stat->qid.path);
- p9_put_int32(bufp, wstat->mode, &stat->mode);
- p9_put_int32(bufp, wstat->atime, &stat->atime);
- p9_put_int32(bufp, wstat->mtime, &stat->mtime);
- p9_put_int64(bufp, wstat->length, &stat->length);
-
- p9_put_str(bufp, wstat->name, &stat->name);
- p9_put_str(bufp, wstat->uid, &stat->uid);
- p9_put_str(bufp, wstat->gid, &stat->gid);
- p9_put_str(bufp, wstat->muid, &stat->muid);
-
- if (dotu) {
- p9_put_str(bufp, wstat->extension, &stat->extension);
- p9_put_int32(bufp, wstat->n_uid, &stat->n_uid);
- p9_put_int32(bufp, wstat->n_gid, &stat->n_gid);
- p9_put_int32(bufp, wstat->n_muid, &stat->n_muid);
- }
-}
-
-static struct p9_fcall *
-p9_create_common(struct cbuf *bufp, u32 size, u8 id)
-{
- struct p9_fcall *fc;
-
- size += 4 + 1 + 2; /* size[4] id[1] tag[2] */
- fc = kmalloc(sizeof(struct p9_fcall) + size, GFP_KERNEL);
- if (!fc)
- return ERR_PTR(-ENOMEM);
-
- fc->sdata = (char *)fc + sizeof(*fc);
-
- buf_init(bufp, (char *)fc->sdata, size);
- p9_put_int32(bufp, size, &fc->size);
- p9_put_int8(bufp, id, &fc->id);
- p9_put_int16(bufp, P9_NOTAG, &fc->tag);
-
- return fc;
-}
-
-/**
- * p9_set_tag - set the tag field of an &p9_fcall structure
- * @fc: fcall structure to set tag within
- * @tag: tag id to set
- */
-
-void p9_set_tag(struct p9_fcall *fc, u16 tag)
-{
- fc->tag = tag;
- *(__le16 *) (fc->sdata + 5) = cpu_to_le16(tag);
-}
-EXPORT_SYMBOL(p9_set_tag);
-
-/**
- * p9_create_tversion - allocates and creates a T_VERSION request
- * @msize: requested maximum data size
- * @version: version string to negotiate
- *
- */
-struct p9_fcall *p9_create_tversion(u32 msize, char *version)
-{
- int size;
- struct p9_fcall *fc;
- struct cbuf buffer;
- struct cbuf *bufp = &buffer;
-
- size = 4 + 2 + strlen(version); /* msize[4] version[s] */
- fc = p9_create_common(bufp, size, P9_TVERSION);
- if (IS_ERR(fc))
- goto error;
-
- p9_put_int32(bufp, msize, &fc->params.tversion.msize);
- p9_put_str(bufp, version, &fc->params.tversion.version);
-
- if (buf_check_overflow(bufp)) {
- kfree(fc);
- fc = ERR_PTR(-ENOMEM);
- }
-error:
- return fc;
-}
-EXPORT_SYMBOL(p9_create_tversion);
-
-/**
- * p9_create_tauth - allocates and creates a T_AUTH request
- * @afid: handle to use for authentication protocol
- * @uname: user name attempting to authenticate
- * @aname: mount specifier for remote server
- * @n_uname: numeric id for user attempting to authneticate
- * @dotu: 9P2000.u extension flag
- *
- */
-
-struct p9_fcall *p9_create_tauth(u32 afid, char *uname, char *aname,
- u32 n_uname, int dotu)
-{
- int size;
- struct p9_fcall *fc;
- struct cbuf buffer;
- struct cbuf *bufp = &buffer;
-
- /* afid[4] uname[s] aname[s] */
- size = 4 + 2 + 2;
- if (uname)
- size += strlen(uname);
-
- if (aname)
- size += strlen(aname);
-
- if (dotu)
- size += 4; /* n_uname */
-
- fc = p9_create_common(bufp, size, P9_TAUTH);
- if (IS_ERR(fc))
- goto error;
-
- p9_put_int32(bufp, afid, &fc->params.tauth.afid);
- p9_put_str(bufp, uname, &fc->params.tauth.uname);
- p9_put_str(bufp, aname, &fc->params.tauth.aname);
- if (dotu)
- p9_put_int32(bufp, n_uname, &fc->params.tauth.n_uname);
-
- if (buf_check_overflow(bufp)) {
- kfree(fc);
- fc = ERR_PTR(-ENOMEM);
- }
-error:
- return fc;
-}
-EXPORT_SYMBOL(p9_create_tauth);
-
-/**
- * p9_create_tattach - allocates and creates a T_ATTACH request
- * @fid: handle to use for the new mount point
- * @afid: handle to use for authentication protocol
- * @uname: user name attempting to attach
- * @aname: mount specifier for remote server
- * @n_uname: numeric id for user attempting to attach
- * @n_uname: numeric id for user attempting to attach
- * @dotu: 9P2000.u extension flag
- *
- */
-
-struct p9_fcall *
-p9_create_tattach(u32 fid, u32 afid, char *uname, char *aname,
- u32 n_uname, int dotu)
-{
- int size;
- struct p9_fcall *fc;
- struct cbuf buffer;
- struct cbuf *bufp = &buffer;
-
- /* fid[4] afid[4] uname[s] aname[s] */
- size = 4 + 4 + 2 + 2;
- if (uname)
- size += strlen(uname);
-
- if (aname)
- size += strlen(aname);
-
- if (dotu)
- size += 4; /* n_uname */
-
- fc = p9_create_common(bufp, size, P9_TATTACH);
- if (IS_ERR(fc))
- goto error;
-
- p9_put_int32(bufp, fid, &fc->params.tattach.fid);
- p9_put_int32(bufp, afid, &fc->params.tattach.afid);
- p9_put_str(bufp, uname, &fc->params.tattach.uname);
- p9_put_str(bufp, aname, &fc->params.tattach.aname);
- if (dotu)
- p9_put_int32(bufp, n_uname, &fc->params.tattach.n_uname);
-
-error:
- return fc;
-}
-EXPORT_SYMBOL(p9_create_tattach);
-
-/**
- * p9_create_tflush - allocates and creates a T_FLUSH request
- * @oldtag: tag id for the transaction we are attempting to cancel
- *
- */
-
-struct p9_fcall *p9_create_tflush(u16 oldtag)
-{
- int size;
- struct p9_fcall *fc;
- struct cbuf buffer;
- struct cbuf *bufp = &buffer;
-
- size = 2; /* oldtag[2] */
- fc = p9_create_common(bufp, size, P9_TFLUSH);
- if (IS_ERR(fc))
- goto error;
-
- p9_put_int16(bufp, oldtag, &fc->params.tflush.oldtag);
-
- if (buf_check_overflow(bufp)) {
- kfree(fc);
- fc = ERR_PTR(-ENOMEM);
- }
-error:
- return fc;
-}
-EXPORT_SYMBOL(p9_create_tflush);
-
-/**
- * p9_create_twalk - allocates and creates a T_FLUSH request
- * @fid: handle we are traversing from
- * @newfid: a new handle for this transaction
- * @nwname: number of path elements to traverse
- * @wnames: array of path elements
- *
- */
-
-struct p9_fcall *p9_create_twalk(u32 fid, u32 newfid, u16 nwname,
- char **wnames)
-{
- int i, size;
- struct p9_fcall *fc;
- struct cbuf buffer;
- struct cbuf *bufp = &buffer;
-
- if (nwname > P9_MAXWELEM) {
- P9_DPRINTK(P9_DEBUG_ERROR, "nwname > %d\n", P9_MAXWELEM);
- return NULL;
- }
-
- size = 4 + 4 + 2; /* fid[4] newfid[4] nwname[2] ... */
- for (i = 0; i < nwname; i++) {
- size += 2 + strlen(wnames[i]); /* wname[s] */
- }
-
- fc = p9_create_common(bufp, size, P9_TWALK);
- if (IS_ERR(fc))
- goto error;
-
- p9_put_int32(bufp, fid, &fc->params.twalk.fid);
- p9_put_int32(bufp, newfid, &fc->params.twalk.newfid);
- p9_put_int16(bufp, nwname, &fc->params.twalk.nwname);
- for (i = 0; i < nwname; i++) {
- p9_put_str(bufp, wnames[i], &fc->params.twalk.wnames[i]);
- }
-
- if (buf_check_overflow(bufp)) {
- kfree(fc);
- fc = ERR_PTR(-ENOMEM);
- }
-error:
- return fc;
-}
-EXPORT_SYMBOL(p9_create_twalk);
-
-/**
- * p9_create_topen - allocates and creates a T_OPEN request
- * @fid: handle we are trying to open
- * @mode: what mode we are trying to open the file in
- *
- */
-
-struct p9_fcall *p9_create_topen(u32 fid, u8 mode)
-{
- int size;
- struct p9_fcall *fc;
- struct cbuf buffer;
- struct cbuf *bufp = &buffer;
-
- size = 4 + 1; /* fid[4] mode[1] */
- fc = p9_create_common(bufp, size, P9_TOPEN);
- if (IS_ERR(fc))
- goto error;
-
- p9_put_int32(bufp, fid, &fc->params.topen.fid);
- p9_put_int8(bufp, mode, &fc->params.topen.mode);
-
- if (buf_check_overflow(bufp)) {
- kfree(fc);
- fc = ERR_PTR(-ENOMEM);
- }
-error:
- return fc;
-}
-EXPORT_SYMBOL(p9_create_topen);
-
-/**
- * p9_create_tcreate - allocates and creates a T_CREATE request
- * @fid: handle of directory we are trying to create in
- * @name: name of the file we are trying to create
- * @perm: permissions for the file we are trying to create
- * @mode: what mode we are trying to open the file in
- * @extension: 9p2000.u extension string (for special files)
- * @dotu: 9p2000.u enabled flag
- *
- * Note: Plan 9 create semantics include opening the resulting file
- * which is why mode is included.
- */
-
-struct p9_fcall *p9_create_tcreate(u32 fid, char *name, u32 perm, u8 mode,
- char *extension, int dotu)
-{
- int size;
- struct p9_fcall *fc;
- struct cbuf buffer;
- struct cbuf *bufp = &buffer;
-
- /* fid[4] name[s] perm[4] mode[1] */
- size = 4 + 2 + strlen(name) + 4 + 1;
- if (dotu) {
- size += 2 + /* extension[s] */
- (extension == NULL ? 0 : strlen(extension));
- }
-
- fc = p9_create_common(bufp, size, P9_TCREATE);
- if (IS_ERR(fc))
- goto error;
-
- p9_put_int32(bufp, fid, &fc->params.tcreate.fid);
- p9_put_str(bufp, name, &fc->params.tcreate.name);
- p9_put_int32(bufp, perm, &fc->params.tcreate.perm);
- p9_put_int8(bufp, mode, &fc->params.tcreate.mode);
- if (dotu)
- p9_put_str(bufp, extension, &fc->params.tcreate.extension);
-
- if (buf_check_overflow(bufp)) {
- kfree(fc);
- fc = ERR_PTR(-ENOMEM);
- }
-error:
- return fc;
-}
-EXPORT_SYMBOL(p9_create_tcreate);
-
-/**
- * p9_create_tread - allocates and creates a T_READ request
- * @fid: handle of the file we are trying to read
- * @offset: offset to start reading from
- * @count: how many bytes to read
- */
-
-struct p9_fcall *p9_create_tread(u32 fid, u64 offset, u32 count)
-{
- int size;
- struct p9_fcall *fc;
- struct cbuf buffer;
- struct cbuf *bufp = &buffer;
-
- size = 4 + 8 + 4; /* fid[4] offset[8] count[4] */
- fc = p9_create_common(bufp, size, P9_TREAD);
- if (IS_ERR(fc))
- goto error;
-
- p9_put_int32(bufp, fid, &fc->params.tread.fid);
- p9_put_int64(bufp, offset, &fc->params.tread.offset);
- p9_put_int32(bufp, count, &fc->params.tread.count);
-
- if (buf_check_overflow(bufp)) {
- kfree(fc);
- fc = ERR_PTR(-ENOMEM);
- }
-error:
- return fc;
-}
-EXPORT_SYMBOL(p9_create_tread);
-
-/**
- * p9_create_twrite - allocates and creates a T_WRITE request from the kernel
- * @fid: handle of the file we are trying to write
- * @offset: offset to start writing at
- * @count: how many bytes to write
- * @data: data to write
- *
- * This function will create a requst with data buffers from the kernel
- * such as the page cache.
- */
-
-struct p9_fcall *p9_create_twrite(u32 fid, u64 offset, u32 count,
- const char *data)
-{
- int size, err;
- struct p9_fcall *fc;
- struct cbuf buffer;
- struct cbuf *bufp = &buffer;
-
- /* fid[4] offset[8] count[4] data[count] */
- size = 4 + 8 + 4 + count;
- fc = p9_create_common(bufp, size, P9_TWRITE);
- if (IS_ERR(fc))
- goto error;
-
- p9_put_int32(bufp, fid, &fc->params.twrite.fid);
- p9_put_int64(bufp, offset, &fc->params.twrite.offset);
- p9_put_int32(bufp, count, &fc->params.twrite.count);
- err = p9_put_data(bufp, data, count, &fc->params.twrite.data);
- if (err) {
- kfree(fc);
- fc = ERR_PTR(err);
- goto error;
- }
-
- if (buf_check_overflow(bufp)) {
- kfree(fc);
- fc = ERR_PTR(-ENOMEM);
- }
-error:
- return fc;
-}
-EXPORT_SYMBOL(p9_create_twrite);
-
-/**
- * p9_create_twrite_u - allocates and creates a T_WRITE request from userspace
- * @fid: handle of the file we are trying to write
- * @offset: offset to start writing at
- * @count: how many bytes to write
- * @data: data to write
- *
- * This function will create a request with data buffers from userspace
- */
-
-struct p9_fcall *p9_create_twrite_u(u32 fid, u64 offset, u32 count,
- const char __user *data)
-{
- int size, err;
- struct p9_fcall *fc;
- struct cbuf buffer;
- struct cbuf *bufp = &buffer;
-
- /* fid[4] offset[8] count[4] data[count] */
- size = 4 + 8 + 4 + count;
- fc = p9_create_common(bufp, size, P9_TWRITE);
- if (IS_ERR(fc))
- goto error;
-
- p9_put_int32(bufp, fid, &fc->params.twrite.fid);
- p9_put_int64(bufp, offset, &fc->params.twrite.offset);
- p9_put_int32(bufp, count, &fc->params.twrite.count);
- err = p9_put_user_data(bufp, data, count, &fc->params.twrite.data);
- if (err) {
- kfree(fc);
- fc = ERR_PTR(err);
- goto error;
- }
-
- if (buf_check_overflow(bufp)) {
- kfree(fc);
- fc = ERR_PTR(-ENOMEM);
- }
-error:
- return fc;
-}
-EXPORT_SYMBOL(p9_create_twrite_u);
-
-/**
- * p9_create_tclunk - allocate a request to forget about a file handle
- * @fid: handle of the file we closing or forgetting about
- *
- * clunk is used both to close open files and to discard transient handles
- * which may be created during meta-data operations and hierarchy traversal.
- */
-
-struct p9_fcall *p9_create_tclunk(u32 fid)
-{
- int size;
- struct p9_fcall *fc;
- struct cbuf buffer;
- struct cbuf *bufp = &buffer;
-
- size = 4; /* fid[4] */
- fc = p9_create_common(bufp, size, P9_TCLUNK);
- if (IS_ERR(fc))
- goto error;
-
- p9_put_int32(bufp, fid, &fc->params.tclunk.fid);
-
- if (buf_check_overflow(bufp)) {
- kfree(fc);
- fc = ERR_PTR(-ENOMEM);
- }
-error:
- return fc;
-}
-EXPORT_SYMBOL(p9_create_tclunk);
-
-/**
- * p9_create_tremove - allocate and create a request to remove a file
- * @fid: handle of the file or directory we are removing
- *
- */
-
-struct p9_fcall *p9_create_tremove(u32 fid)
-{
- int size;
- struct p9_fcall *fc;
- struct cbuf buffer;
- struct cbuf *bufp = &buffer;
-
- size = 4; /* fid[4] */
- fc = p9_create_common(bufp, size, P9_TREMOVE);
- if (IS_ERR(fc))
- goto error;
-
- p9_put_int32(bufp, fid, &fc->params.tremove.fid);
-
- if (buf_check_overflow(bufp)) {
- kfree(fc);
- fc = ERR_PTR(-ENOMEM);
- }
-error:
- return fc;
-}
-EXPORT_SYMBOL(p9_create_tremove);
-
-/**
- * p9_create_tstat - allocate and populate a request for attributes
- * @fid: handle of the file or directory we are trying to get the attributes of
- *
- */
-
-struct p9_fcall *p9_create_tstat(u32 fid)
-{
- int size;
- struct p9_fcall *fc;
- struct cbuf buffer;
- struct cbuf *bufp = &buffer;
-
- size = 4; /* fid[4] */
- fc = p9_create_common(bufp, size, P9_TSTAT);
- if (IS_ERR(fc))
- goto error;
-
- p9_put_int32(bufp, fid, &fc->params.tstat.fid);
-
- if (buf_check_overflow(bufp)) {
- kfree(fc);
- fc = ERR_PTR(-ENOMEM);
- }
-error:
- return fc;
-}
-EXPORT_SYMBOL(p9_create_tstat);
-
-/**
- * p9_create_tstat - allocate and populate a request to change attributes
- * @fid: handle of the file or directory we are trying to change
- * @wstat: &p9_stat structure with attributes we wish to set
- * @dotu: 9p2000.u enabled flag
- *
- */
-
-struct p9_fcall *p9_create_twstat(u32 fid, struct p9_wstat *wstat,
- int dotu)
-{
- int size, statsz;
- struct p9_fcall *fc;
- struct cbuf buffer;
- struct cbuf *bufp = &buffer;
-
- statsz = p9_size_wstat(wstat, dotu);
- size = 4 + 2 + 2 + statsz; /* fid[4] stat[n] */
- fc = p9_create_common(bufp, size, P9_TWSTAT);
- if (IS_ERR(fc))
- goto error;
-
- p9_put_int32(bufp, fid, &fc->params.twstat.fid);
- buf_put_int16(bufp, statsz + 2);
- p9_put_wstat(bufp, wstat, &fc->params.twstat.stat, statsz, dotu);
-
- if (buf_check_overflow(bufp)) {
- kfree(fc);
- fc = ERR_PTR(-ENOMEM);
- }
-error:
- return fc;
-}
-EXPORT_SYMBOL(p9_create_twstat);
-
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff