![Latchesar Ionkov](/assets/img/avatar_default.png)
Implement a new way of creating special files. Instead of Tcreate+Twstat, add one more field to Tcreate that contains special file description. Signed-off-by: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
845 lines
18 KiB
C
845 lines
18 KiB
C
/*
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* linux/fs/9p/conv.c
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*
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* 9P protocol conversion functions
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*
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* Copyright (C) 2004, 2005 by Latchesar Ionkov <lucho@ionkov.net>
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/idr.h>
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#include <asm/uaccess.h>
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#include "debug.h"
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#include "v9fs.h"
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#include "9p.h"
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#include "conv.h"
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/*
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* Buffer to help with string parsing
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*/
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struct cbuf {
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unsigned char *sp;
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unsigned char *p;
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unsigned char *ep;
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};
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static inline void buf_init(struct cbuf *buf, void *data, int datalen)
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{
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buf->sp = buf->p = data;
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buf->ep = data + datalen;
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}
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static inline int buf_check_overflow(struct cbuf *buf)
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{
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return buf->p > buf->ep;
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}
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static int buf_check_size(struct cbuf *buf, int len)
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{
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if (buf->p + len > buf->ep) {
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if (buf->p < buf->ep) {
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eprintk(KERN_ERR, "buffer overflow: want %d has %d\n",
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len, (int)(buf->ep - buf->p));
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dump_stack();
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buf->p = buf->ep + 1;
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}
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return 0;
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}
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return 1;
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}
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static void *buf_alloc(struct cbuf *buf, int len)
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{
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void *ret = NULL;
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if (buf_check_size(buf, len)) {
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ret = buf->p;
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buf->p += len;
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}
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return ret;
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}
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static void buf_put_int8(struct cbuf *buf, u8 val)
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{
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if (buf_check_size(buf, 1)) {
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buf->p[0] = val;
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buf->p++;
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}
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}
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static void buf_put_int16(struct cbuf *buf, u16 val)
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{
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if (buf_check_size(buf, 2)) {
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*(__le16 *) buf->p = cpu_to_le16(val);
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buf->p += 2;
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}
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}
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static void buf_put_int32(struct cbuf *buf, u32 val)
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{
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if (buf_check_size(buf, 4)) {
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*(__le32 *)buf->p = cpu_to_le32(val);
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buf->p += 4;
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}
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}
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static void buf_put_int64(struct cbuf *buf, u64 val)
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{
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if (buf_check_size(buf, 8)) {
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*(__le64 *)buf->p = cpu_to_le64(val);
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buf->p += 8;
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}
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}
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static char *buf_put_stringn(struct cbuf *buf, const char *s, u16 slen)
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{
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char *ret;
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ret = NULL;
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if (buf_check_size(buf, slen + 2)) {
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buf_put_int16(buf, slen);
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ret = buf->p;
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memcpy(buf->p, s, slen);
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buf->p += slen;
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}
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return ret;
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}
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static inline void buf_put_string(struct cbuf *buf, const char *s)
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{
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buf_put_stringn(buf, s, strlen(s));
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}
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static u8 buf_get_int8(struct cbuf *buf)
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{
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u8 ret = 0;
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if (buf_check_size(buf, 1)) {
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ret = buf->p[0];
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buf->p++;
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}
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return ret;
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}
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static u16 buf_get_int16(struct cbuf *buf)
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{
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u16 ret = 0;
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if (buf_check_size(buf, 2)) {
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ret = le16_to_cpu(*(__le16 *)buf->p);
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buf->p += 2;
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}
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return ret;
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}
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static u32 buf_get_int32(struct cbuf *buf)
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{
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u32 ret = 0;
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if (buf_check_size(buf, 4)) {
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ret = le32_to_cpu(*(__le32 *)buf->p);
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buf->p += 4;
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}
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return ret;
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}
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static u64 buf_get_int64(struct cbuf *buf)
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{
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u64 ret = 0;
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if (buf_check_size(buf, 8)) {
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ret = le64_to_cpu(*(__le64 *)buf->p);
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buf->p += 8;
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}
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return ret;
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}
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static void buf_get_str(struct cbuf *buf, struct v9fs_str *vstr)
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{
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vstr->len = buf_get_int16(buf);
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if (!buf_check_overflow(buf) && buf_check_size(buf, vstr->len)) {
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vstr->str = buf->p;
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buf->p += vstr->len;
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} else {
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vstr->len = 0;
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vstr->str = NULL;
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}
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}
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static void buf_get_qid(struct cbuf *bufp, struct v9fs_qid *qid)
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{
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qid->type = buf_get_int8(bufp);
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qid->version = buf_get_int32(bufp);
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qid->path = buf_get_int64(bufp);
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}
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/**
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* v9fs_size_wstat - calculate the size of a variable length stat struct
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* @stat: metadata (stat) structure
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* @extended: non-zero if 9P2000.u
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*
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*/
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static int v9fs_size_wstat(struct v9fs_wstat *wstat, int extended)
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{
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int size = 0;
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if (wstat == NULL) {
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eprintk(KERN_ERR, "v9fs_size_stat: got a NULL stat pointer\n");
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return 0;
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}
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size = /* 2 + *//* size[2] */
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2 + /* type[2] */
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4 + /* dev[4] */
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1 + /* qid.type[1] */
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4 + /* qid.vers[4] */
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8 + /* qid.path[8] */
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4 + /* mode[4] */
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4 + /* atime[4] */
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4 + /* mtime[4] */
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8 + /* length[8] */
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8; /* minimum sum of string lengths */
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if (wstat->name)
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size += strlen(wstat->name);
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if (wstat->uid)
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size += strlen(wstat->uid);
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if (wstat->gid)
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size += strlen(wstat->gid);
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if (wstat->muid)
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size += strlen(wstat->muid);
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if (extended) {
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size += 4 + /* n_uid[4] */
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4 + /* n_gid[4] */
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4 + /* n_muid[4] */
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2; /* string length of extension[4] */
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if (wstat->extension)
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size += strlen(wstat->extension);
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}
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return size;
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}
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/**
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* buf_get_stat - safely decode a recieved metadata (stat) structure
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* @bufp: buffer to deserialize
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* @stat: metadata (stat) structure
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* @extended: non-zero if 9P2000.u
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*
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*/
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static void
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buf_get_stat(struct cbuf *bufp, struct v9fs_stat *stat, int extended)
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{
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stat->size = buf_get_int16(bufp);
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stat->type = buf_get_int16(bufp);
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stat->dev = buf_get_int32(bufp);
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stat->qid.type = buf_get_int8(bufp);
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stat->qid.version = buf_get_int32(bufp);
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stat->qid.path = buf_get_int64(bufp);
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stat->mode = buf_get_int32(bufp);
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stat->atime = buf_get_int32(bufp);
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stat->mtime = buf_get_int32(bufp);
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stat->length = buf_get_int64(bufp);
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buf_get_str(bufp, &stat->name);
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buf_get_str(bufp, &stat->uid);
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buf_get_str(bufp, &stat->gid);
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buf_get_str(bufp, &stat->muid);
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if (extended) {
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buf_get_str(bufp, &stat->extension);
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stat->n_uid = buf_get_int32(bufp);
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stat->n_gid = buf_get_int32(bufp);
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stat->n_muid = buf_get_int32(bufp);
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}
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}
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/**
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* v9fs_deserialize_stat - decode a received metadata structure
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* @buf: buffer to deserialize
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* @buflen: length of received buffer
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* @stat: metadata structure to decode into
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* @extended: non-zero if 9P2000.u
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*
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* Note: stat will point to the buf region.
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*/
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int
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v9fs_deserialize_stat(void *buf, u32 buflen, struct v9fs_stat *stat,
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int extended)
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{
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struct cbuf buffer;
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struct cbuf *bufp = &buffer;
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unsigned char *p;
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buf_init(bufp, buf, buflen);
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p = bufp->p;
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buf_get_stat(bufp, stat, extended);
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if (buf_check_overflow(bufp))
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return 0;
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else
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return bufp->p - p;
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}
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/**
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* deserialize_fcall - unmarshal a response
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* @buf: recieved buffer
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* @buflen: length of received buffer
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* @rcall: fcall structure to populate
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* @rcalllen: length of fcall structure to populate
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* @extended: non-zero if 9P2000.u
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*
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*/
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int
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v9fs_deserialize_fcall(void *buf, u32 buflen, struct v9fs_fcall *rcall,
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int extended)
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{
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struct cbuf buffer;
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struct cbuf *bufp = &buffer;
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int i = 0;
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buf_init(bufp, buf, buflen);
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rcall->size = buf_get_int32(bufp);
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rcall->id = buf_get_int8(bufp);
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rcall->tag = buf_get_int16(bufp);
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dprintk(DEBUG_CONV, "size %d id %d tag %d\n", rcall->size, rcall->id,
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rcall->tag);
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switch (rcall->id) {
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default:
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eprintk(KERN_ERR, "unknown message type: %d\n", rcall->id);
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return -EPROTO;
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case RVERSION:
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rcall->params.rversion.msize = buf_get_int32(bufp);
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buf_get_str(bufp, &rcall->params.rversion.version);
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break;
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case RFLUSH:
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break;
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case RATTACH:
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rcall->params.rattach.qid.type = buf_get_int8(bufp);
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rcall->params.rattach.qid.version = buf_get_int32(bufp);
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rcall->params.rattach.qid.path = buf_get_int64(bufp);
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break;
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case RWALK:
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rcall->params.rwalk.nwqid = buf_get_int16(bufp);
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if (rcall->params.rwalk.nwqid > V9FS_MAXWELEM) {
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eprintk(KERN_ERR, "Rwalk with more than %d qids: %d\n",
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V9FS_MAXWELEM, rcall->params.rwalk.nwqid);
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return -EPROTO;
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}
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for (i = 0; i < rcall->params.rwalk.nwqid; i++)
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buf_get_qid(bufp, &rcall->params.rwalk.wqids[i]);
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break;
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case ROPEN:
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buf_get_qid(bufp, &rcall->params.ropen.qid);
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rcall->params.ropen.iounit = buf_get_int32(bufp);
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break;
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case RCREATE:
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buf_get_qid(bufp, &rcall->params.rcreate.qid);
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rcall->params.rcreate.iounit = buf_get_int32(bufp);
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break;
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case RREAD:
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rcall->params.rread.count = buf_get_int32(bufp);
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rcall->params.rread.data = bufp->p;
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buf_check_size(bufp, rcall->params.rread.count);
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break;
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case RWRITE:
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rcall->params.rwrite.count = buf_get_int32(bufp);
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break;
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case RCLUNK:
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break;
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case RREMOVE:
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break;
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case RSTAT:
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buf_get_int16(bufp);
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buf_get_stat(bufp, &rcall->params.rstat.stat, extended);
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break;
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case RWSTAT:
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break;
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case RERROR:
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buf_get_str(bufp, &rcall->params.rerror.error);
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if (extended)
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rcall->params.rerror.errno = buf_get_int16(bufp);
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break;
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}
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if (buf_check_overflow(bufp)) {
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dprintk(DEBUG_ERROR, "buffer overflow\n");
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return -EIO;
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}
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return bufp->p - bufp->sp;
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}
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static inline void v9fs_put_int8(struct cbuf *bufp, u8 val, u8 * p)
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{
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*p = val;
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buf_put_int8(bufp, val);
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}
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static inline void v9fs_put_int16(struct cbuf *bufp, u16 val, u16 * p)
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{
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*p = val;
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buf_put_int16(bufp, val);
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}
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static inline void v9fs_put_int32(struct cbuf *bufp, u32 val, u32 * p)
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{
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*p = val;
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buf_put_int32(bufp, val);
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}
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static inline void v9fs_put_int64(struct cbuf *bufp, u64 val, u64 * p)
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{
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*p = val;
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buf_put_int64(bufp, val);
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}
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static void
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v9fs_put_str(struct cbuf *bufp, char *data, struct v9fs_str *str)
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{
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int len;
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char *s;
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if (data)
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len = strlen(data);
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else
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len = 0;
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s = buf_put_stringn(bufp, data, len);
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if (str) {
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str->len = len;
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str->str = s;
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}
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}
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static int
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v9fs_put_user_data(struct cbuf *bufp, const char __user * data, int count,
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unsigned char **pdata)
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{
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*pdata = buf_alloc(bufp, count);
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return copy_from_user(*pdata, data, count);
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}
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static void
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v9fs_put_wstat(struct cbuf *bufp, struct v9fs_wstat *wstat,
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struct v9fs_stat *stat, int statsz, int extended)
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{
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v9fs_put_int16(bufp, statsz, &stat->size);
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v9fs_put_int16(bufp, wstat->type, &stat->type);
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v9fs_put_int32(bufp, wstat->dev, &stat->dev);
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v9fs_put_int8(bufp, wstat->qid.type, &stat->qid.type);
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v9fs_put_int32(bufp, wstat->qid.version, &stat->qid.version);
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v9fs_put_int64(bufp, wstat->qid.path, &stat->qid.path);
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v9fs_put_int32(bufp, wstat->mode, &stat->mode);
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v9fs_put_int32(bufp, wstat->atime, &stat->atime);
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v9fs_put_int32(bufp, wstat->mtime, &stat->mtime);
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v9fs_put_int64(bufp, wstat->length, &stat->length);
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v9fs_put_str(bufp, wstat->name, &stat->name);
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v9fs_put_str(bufp, wstat->uid, &stat->uid);
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v9fs_put_str(bufp, wstat->gid, &stat->gid);
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v9fs_put_str(bufp, wstat->muid, &stat->muid);
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if (extended) {
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v9fs_put_str(bufp, wstat->extension, &stat->extension);
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v9fs_put_int32(bufp, wstat->n_uid, &stat->n_uid);
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v9fs_put_int32(bufp, wstat->n_gid, &stat->n_gid);
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v9fs_put_int32(bufp, wstat->n_muid, &stat->n_muid);
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}
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}
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static struct v9fs_fcall *
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v9fs_create_common(struct cbuf *bufp, u32 size, u8 id)
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{
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struct v9fs_fcall *fc;
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size += 4 + 1 + 2; /* size[4] id[1] tag[2] */
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fc = kmalloc(sizeof(struct v9fs_fcall) + size, GFP_KERNEL);
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if (!fc)
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return ERR_PTR(-ENOMEM);
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fc->sdata = (char *)fc + sizeof(*fc);
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buf_init(bufp, (char *)fc->sdata, size);
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v9fs_put_int32(bufp, size, &fc->size);
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v9fs_put_int8(bufp, id, &fc->id);
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v9fs_put_int16(bufp, V9FS_NOTAG, &fc->tag);
|
|
|
|
return fc;
|
|
}
|
|
|
|
void v9fs_set_tag(struct v9fs_fcall *fc, u16 tag)
|
|
{
|
|
fc->tag = tag;
|
|
*(__le16 *) (fc->sdata + 5) = cpu_to_le16(tag);
|
|
}
|
|
|
|
struct v9fs_fcall *v9fs_create_tversion(u32 msize, char *version)
|
|
{
|
|
int size;
|
|
struct v9fs_fcall *fc;
|
|
struct cbuf buffer;
|
|
struct cbuf *bufp = &buffer;
|
|
|
|
size = 4 + 2 + strlen(version); /* msize[4] version[s] */
|
|
fc = v9fs_create_common(bufp, size, TVERSION);
|
|
if (IS_ERR(fc))
|
|
goto error;
|
|
|
|
v9fs_put_int32(bufp, msize, &fc->params.tversion.msize);
|
|
v9fs_put_str(bufp, version, &fc->params.tversion.version);
|
|
|
|
if (buf_check_overflow(bufp)) {
|
|
kfree(fc);
|
|
fc = ERR_PTR(-ENOMEM);
|
|
}
|
|
error:
|
|
return fc;
|
|
}
|
|
|
|
#if 0
|
|
struct v9fs_fcall *v9fs_create_tauth(u32 afid, char *uname, char *aname)
|
|
{
|
|
int size;
|
|
struct v9fs_fcall *fc;
|
|
struct cbuf buffer;
|
|
struct cbuf *bufp = &buffer;
|
|
|
|
size = 4 + 2 + strlen(uname) + 2 + strlen(aname); /* afid[4] uname[s] aname[s] */
|
|
fc = v9fs_create_common(bufp, size, TAUTH);
|
|
if (IS_ERR(fc))
|
|
goto error;
|
|
|
|
v9fs_put_int32(bufp, afid, &fc->params.tauth.afid);
|
|
v9fs_put_str(bufp, uname, &fc->params.tauth.uname);
|
|
v9fs_put_str(bufp, aname, &fc->params.tauth.aname);
|
|
|
|
if (buf_check_overflow(bufp)) {
|
|
kfree(fc);
|
|
fc = ERR_PTR(-ENOMEM);
|
|
}
|
|
error:
|
|
return fc;
|
|
}
|
|
#endif /* 0 */
|
|
|
|
struct v9fs_fcall *
|
|
v9fs_create_tattach(u32 fid, u32 afid, char *uname, char *aname)
|
|
{
|
|
int size;
|
|
struct v9fs_fcall *fc;
|
|
struct cbuf buffer;
|
|
struct cbuf *bufp = &buffer;
|
|
|
|
size = 4 + 4 + 2 + strlen(uname) + 2 + strlen(aname); /* fid[4] afid[4] uname[s] aname[s] */
|
|
fc = v9fs_create_common(bufp, size, TATTACH);
|
|
if (IS_ERR(fc))
|
|
goto error;
|
|
|
|
v9fs_put_int32(bufp, fid, &fc->params.tattach.fid);
|
|
v9fs_put_int32(bufp, afid, &fc->params.tattach.afid);
|
|
v9fs_put_str(bufp, uname, &fc->params.tattach.uname);
|
|
v9fs_put_str(bufp, aname, &fc->params.tattach.aname);
|
|
|
|
error:
|
|
return fc;
|
|
}
|
|
|
|
struct v9fs_fcall *v9fs_create_tflush(u16 oldtag)
|
|
{
|
|
int size;
|
|
struct v9fs_fcall *fc;
|
|
struct cbuf buffer;
|
|
struct cbuf *bufp = &buffer;
|
|
|
|
size = 2; /* oldtag[2] */
|
|
fc = v9fs_create_common(bufp, size, TFLUSH);
|
|
if (IS_ERR(fc))
|
|
goto error;
|
|
|
|
v9fs_put_int16(bufp, oldtag, &fc->params.tflush.oldtag);
|
|
|
|
if (buf_check_overflow(bufp)) {
|
|
kfree(fc);
|
|
fc = ERR_PTR(-ENOMEM);
|
|
}
|
|
error:
|
|
return fc;
|
|
}
|
|
|
|
struct v9fs_fcall *v9fs_create_twalk(u32 fid, u32 newfid, u16 nwname,
|
|
char **wnames)
|
|
{
|
|
int i, size;
|
|
struct v9fs_fcall *fc;
|
|
struct cbuf buffer;
|
|
struct cbuf *bufp = &buffer;
|
|
|
|
if (nwname > V9FS_MAXWELEM) {
|
|
dprintk(DEBUG_ERROR, "nwname > %d\n", V9FS_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 = v9fs_create_common(bufp, size, TWALK);
|
|
if (IS_ERR(fc))
|
|
goto error;
|
|
|
|
v9fs_put_int32(bufp, fid, &fc->params.twalk.fid);
|
|
v9fs_put_int32(bufp, newfid, &fc->params.twalk.newfid);
|
|
v9fs_put_int16(bufp, nwname, &fc->params.twalk.nwname);
|
|
for (i = 0; i < nwname; i++) {
|
|
v9fs_put_str(bufp, wnames[i], &fc->params.twalk.wnames[i]);
|
|
}
|
|
|
|
if (buf_check_overflow(bufp)) {
|
|
kfree(fc);
|
|
fc = ERR_PTR(-ENOMEM);
|
|
}
|
|
error:
|
|
return fc;
|
|
}
|
|
|
|
struct v9fs_fcall *v9fs_create_topen(u32 fid, u8 mode)
|
|
{
|
|
int size;
|
|
struct v9fs_fcall *fc;
|
|
struct cbuf buffer;
|
|
struct cbuf *bufp = &buffer;
|
|
|
|
size = 4 + 1; /* fid[4] mode[1] */
|
|
fc = v9fs_create_common(bufp, size, TOPEN);
|
|
if (IS_ERR(fc))
|
|
goto error;
|
|
|
|
v9fs_put_int32(bufp, fid, &fc->params.topen.fid);
|
|
v9fs_put_int8(bufp, mode, &fc->params.topen.mode);
|
|
|
|
if (buf_check_overflow(bufp)) {
|
|
kfree(fc);
|
|
fc = ERR_PTR(-ENOMEM);
|
|
}
|
|
error:
|
|
return fc;
|
|
}
|
|
|
|
struct v9fs_fcall *v9fs_create_tcreate(u32 fid, char *name, u32 perm, u8 mode,
|
|
char *extension, int extended)
|
|
{
|
|
int size;
|
|
struct v9fs_fcall *fc;
|
|
struct cbuf buffer;
|
|
struct cbuf *bufp = &buffer;
|
|
|
|
size = 4 + 2 + strlen(name) + 4 + 1; /* fid[4] name[s] perm[4] mode[1] */
|
|
if (extended && extension!=NULL)
|
|
size += 2 + strlen(extension); /* extension[s] */
|
|
|
|
fc = v9fs_create_common(bufp, size, TCREATE);
|
|
if (IS_ERR(fc))
|
|
goto error;
|
|
|
|
v9fs_put_int32(bufp, fid, &fc->params.tcreate.fid);
|
|
v9fs_put_str(bufp, name, &fc->params.tcreate.name);
|
|
v9fs_put_int32(bufp, perm, &fc->params.tcreate.perm);
|
|
v9fs_put_int8(bufp, mode, &fc->params.tcreate.mode);
|
|
if (extended)
|
|
v9fs_put_str(bufp, extension, &fc->params.tcreate.extension);
|
|
|
|
if (buf_check_overflow(bufp)) {
|
|
kfree(fc);
|
|
fc = ERR_PTR(-ENOMEM);
|
|
}
|
|
error:
|
|
return fc;
|
|
}
|
|
|
|
struct v9fs_fcall *v9fs_create_tread(u32 fid, u64 offset, u32 count)
|
|
{
|
|
int size;
|
|
struct v9fs_fcall *fc;
|
|
struct cbuf buffer;
|
|
struct cbuf *bufp = &buffer;
|
|
|
|
size = 4 + 8 + 4; /* fid[4] offset[8] count[4] */
|
|
fc = v9fs_create_common(bufp, size, TREAD);
|
|
if (IS_ERR(fc))
|
|
goto error;
|
|
|
|
v9fs_put_int32(bufp, fid, &fc->params.tread.fid);
|
|
v9fs_put_int64(bufp, offset, &fc->params.tread.offset);
|
|
v9fs_put_int32(bufp, count, &fc->params.tread.count);
|
|
|
|
if (buf_check_overflow(bufp)) {
|
|
kfree(fc);
|
|
fc = ERR_PTR(-ENOMEM);
|
|
}
|
|
error:
|
|
return fc;
|
|
}
|
|
|
|
struct v9fs_fcall *v9fs_create_twrite(u32 fid, u64 offset, u32 count,
|
|
const char __user * data)
|
|
{
|
|
int size, err;
|
|
struct v9fs_fcall *fc;
|
|
struct cbuf buffer;
|
|
struct cbuf *bufp = &buffer;
|
|
|
|
size = 4 + 8 + 4 + count; /* fid[4] offset[8] count[4] data[count] */
|
|
fc = v9fs_create_common(bufp, size, TWRITE);
|
|
if (IS_ERR(fc))
|
|
goto error;
|
|
|
|
v9fs_put_int32(bufp, fid, &fc->params.twrite.fid);
|
|
v9fs_put_int64(bufp, offset, &fc->params.twrite.offset);
|
|
v9fs_put_int32(bufp, count, &fc->params.twrite.count);
|
|
err = v9fs_put_user_data(bufp, data, count, &fc->params.twrite.data);
|
|
if (err) {
|
|
kfree(fc);
|
|
fc = ERR_PTR(err);
|
|
}
|
|
|
|
if (buf_check_overflow(bufp)) {
|
|
kfree(fc);
|
|
fc = ERR_PTR(-ENOMEM);
|
|
}
|
|
error:
|
|
return fc;
|
|
}
|
|
|
|
struct v9fs_fcall *v9fs_create_tclunk(u32 fid)
|
|
{
|
|
int size;
|
|
struct v9fs_fcall *fc;
|
|
struct cbuf buffer;
|
|
struct cbuf *bufp = &buffer;
|
|
|
|
size = 4; /* fid[4] */
|
|
fc = v9fs_create_common(bufp, size, TCLUNK);
|
|
if (IS_ERR(fc))
|
|
goto error;
|
|
|
|
v9fs_put_int32(bufp, fid, &fc->params.tclunk.fid);
|
|
|
|
if (buf_check_overflow(bufp)) {
|
|
kfree(fc);
|
|
fc = ERR_PTR(-ENOMEM);
|
|
}
|
|
error:
|
|
return fc;
|
|
}
|
|
|
|
struct v9fs_fcall *v9fs_create_tremove(u32 fid)
|
|
{
|
|
int size;
|
|
struct v9fs_fcall *fc;
|
|
struct cbuf buffer;
|
|
struct cbuf *bufp = &buffer;
|
|
|
|
size = 4; /* fid[4] */
|
|
fc = v9fs_create_common(bufp, size, TREMOVE);
|
|
if (IS_ERR(fc))
|
|
goto error;
|
|
|
|
v9fs_put_int32(bufp, fid, &fc->params.tremove.fid);
|
|
|
|
if (buf_check_overflow(bufp)) {
|
|
kfree(fc);
|
|
fc = ERR_PTR(-ENOMEM);
|
|
}
|
|
error:
|
|
return fc;
|
|
}
|
|
|
|
struct v9fs_fcall *v9fs_create_tstat(u32 fid)
|
|
{
|
|
int size;
|
|
struct v9fs_fcall *fc;
|
|
struct cbuf buffer;
|
|
struct cbuf *bufp = &buffer;
|
|
|
|
size = 4; /* fid[4] */
|
|
fc = v9fs_create_common(bufp, size, TSTAT);
|
|
if (IS_ERR(fc))
|
|
goto error;
|
|
|
|
v9fs_put_int32(bufp, fid, &fc->params.tstat.fid);
|
|
|
|
if (buf_check_overflow(bufp)) {
|
|
kfree(fc);
|
|
fc = ERR_PTR(-ENOMEM);
|
|
}
|
|
error:
|
|
return fc;
|
|
}
|
|
|
|
struct v9fs_fcall *v9fs_create_twstat(u32 fid, struct v9fs_wstat *wstat,
|
|
int extended)
|
|
{
|
|
int size, statsz;
|
|
struct v9fs_fcall *fc;
|
|
struct cbuf buffer;
|
|
struct cbuf *bufp = &buffer;
|
|
|
|
statsz = v9fs_size_wstat(wstat, extended);
|
|
size = 4 + 2 + 2 + statsz; /* fid[4] stat[n] */
|
|
fc = v9fs_create_common(bufp, size, TWSTAT);
|
|
if (IS_ERR(fc))
|
|
goto error;
|
|
|
|
v9fs_put_int32(bufp, fid, &fc->params.twstat.fid);
|
|
buf_put_int16(bufp, statsz + 2);
|
|
v9fs_put_wstat(bufp, wstat, &fc->params.twstat.stat, statsz, extended);
|
|
|
|
if (buf_check_overflow(bufp)) {
|
|
kfree(fc);
|
|
fc = ERR_PTR(-ENOMEM);
|
|
}
|
|
error:
|
|
return fc;
|
|
}
|