diff options
Diffstat (limited to 'fs/9p/conv.c')
| -rw-r--r-- | fs/9p/conv.c | 845 |
1 files changed, 0 insertions, 845 deletions
diff --git a/fs/9p/conv.c b/fs/9p/conv.c deleted file mode 100644 index a3ed571eee31..000000000000 --- a/fs/9p/conv.c +++ /dev/null @@ -1,845 +0,0 @@ -/* - * linux/fs/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 <asm/uaccess.h> -#include "debug.h" -#include "v9fs.h" -#include "9p.h" -#include "conv.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) { - 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 inline void buf_put_string(struct cbuf *buf, const char *s) -{ - buf_put_stringn(buf, s, strlen(s)); -} - -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 v9fs_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 v9fs_qid *qid) -{ - qid->type = buf_get_int8(bufp); - qid->version = buf_get_int32(bufp); - qid->path = buf_get_int64(bufp); -} - -/** - * v9fs_size_wstat - calculate the size of a variable length stat struct - * @stat: metadata (stat) structure - * @extended: non-zero if 9P2000.u - * - */ - -static int v9fs_size_wstat(struct v9fs_wstat *wstat, int extended) -{ - int size = 0; - - if (wstat == NULL) { - eprintk(KERN_ERR, "v9fs_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 (extended) { - 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 - * @extended: non-zero if 9P2000.u - * - */ - -static void -buf_get_stat(struct cbuf *bufp, struct v9fs_stat *stat, int extended) -{ - 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 (extended) { - 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); - } -} - -/** - * v9fs_deserialize_stat - decode a received metadata structure - * @buf: buffer to deserialize - * @buflen: length of received buffer - * @stat: metadata structure to decode into - * @extended: non-zero if 9P2000.u - * - * Note: stat will point to the buf region. - */ - -int -v9fs_deserialize_stat(void *buf, u32 buflen, struct v9fs_stat *stat, - int extended) -{ - struct cbuf buffer; - struct cbuf *bufp = &buffer; - unsigned char *p; - - buf_init(bufp, buf, buflen); - p = bufp->p; - buf_get_stat(bufp, stat, extended); - - if (buf_check_overflow(bufp)) - return 0; - else - return bufp->p - p; -} - -/** - * 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 - * @extended: non-zero if 9P2000.u - * - */ - -int -v9fs_deserialize_fcall(void *buf, u32 buflen, struct v9fs_fcall *rcall, - int extended) -{ - - 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); - - dprintk(DEBUG_CONV, "size %d id %d tag %d\n", rcall->size, rcall->id, - rcall->tag); - - switch (rcall->id) { - default: - eprintk(KERN_ERR, "unknown message type: %d\n", rcall->id); - return -EPROTO; - case RVERSION: - rcall->params.rversion.msize = buf_get_int32(bufp); - buf_get_str(bufp, &rcall->params.rversion.version); - break; - case RFLUSH: - break; - case 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 RWALK: - rcall->params.rwalk.nwqid = buf_get_int16(bufp); - if (rcall->params.rwalk.nwqid > V9FS_MAXWELEM) { - eprintk(KERN_ERR, "Rwalk with more than %d qids: %d\n", - V9FS_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 ROPEN: - buf_get_qid(bufp, &rcall->params.ropen.qid); - rcall->params.ropen.iounit = buf_get_int32(bufp); - break; - case RCREATE: - buf_get_qid(bufp, &rcall->params.rcreate.qid); - rcall->params.rcreate.iounit = buf_get_int32(bufp); - break; - case 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 RWRITE: - rcall->params.rwrite.count = buf_get_int32(bufp); - break; - case RCLUNK: - break; - case RREMOVE: - break; - case RSTAT: - buf_get_int16(bufp); - buf_get_stat(bufp, &rcall->params.rstat.stat, extended); - break; - case RWSTAT: - break; - case RERROR: - buf_get_str(bufp, &rcall->params.rerror.error); - if (extended) - rcall->params.rerror.errno = buf_get_int16(bufp); - break; - } - - if (buf_check_overflow(bufp)) { - dprintk(DEBUG_ERROR, "buffer overflow\n"); - return -EIO; - } - - return bufp->p - bufp->sp; -} - -static inline void v9fs_put_int8(struct cbuf *bufp, u8 val, u8 * p) -{ - *p = val; - buf_put_int8(bufp, val); -} - -static inline void v9fs_put_int16(struct cbuf *bufp, u16 val, u16 * p) -{ - *p = val; - buf_put_int16(bufp, val); -} - -static inline void v9fs_put_int32(struct cbuf *bufp, u32 val, u32 * p) -{ - *p = val; - buf_put_int32(bufp, val); -} - -static inline void v9fs_put_int64(struct cbuf *bufp, u64 val, u64 * p) -{ - *p = val; - buf_put_int64(bufp, val); -} - -static void -v9fs_put_str(struct cbuf *bufp, char *data, struct v9fs_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 -v9fs_put_user_data(struct cbuf *bufp, const char __user * data, int count, - unsigned char **pdata) -{ - *pdata = buf_alloc(bufp, count); - return copy_from_user(*pdata, data, count); -} - -static void -v9fs_put_wstat(struct cbuf *bufp, struct v9fs_wstat *wstat, - struct v9fs_stat *stat, int statsz, int extended) -{ - v9fs_put_int16(bufp, statsz, &stat->size); - v9fs_put_int16(bufp, wstat->type, &stat->type); - v9fs_put_int32(bufp, wstat->dev, &stat->dev); - v9fs_put_int8(bufp, wstat->qid.type, &stat->qid.type); - v9fs_put_int32(bufp, wstat->qid.version, &stat->qid.version); - v9fs_put_int64(bufp, wstat->qid.path, &stat->qid.path); - v9fs_put_int32(bufp, wstat->mode, &stat->mode); - v9fs_put_int32(bufp, wstat->atime, &stat->atime); - v9fs_put_int32(bufp, wstat->mtime, &stat->mtime); - v9fs_put_int64(bufp, wstat->length, &stat->length); - - v9fs_put_str(bufp, wstat->name, &stat->name); - v9fs_put_str(bufp, wstat->uid, &stat->uid); - v9fs_put_str(bufp, wstat->gid, &stat->gid); - v9fs_put_str(bufp, wstat->muid, &stat->muid); - - if (extended) { - v9fs_put_str(bufp, wstat->extension, &stat->extension); - v9fs_put_int32(bufp, wstat->n_uid, &stat->n_uid); - v9fs_put_int32(bufp, wstat->n_gid, &stat->n_gid); - v9fs_put_int32(bufp, wstat->n_muid, &stat->n_muid); - } -} - -static struct v9fs_fcall * -v9fs_create_common(struct cbuf *bufp, u32 size, u8 id) -{ - struct v9fs_fcall *fc; - - size += 4 + 1 + 2; /* size[4] id[1] tag[2] */ - fc = kmalloc(sizeof(struct v9fs_fcall) + size, GFP_KERNEL); - if (!fc) - return ERR_PTR(-ENOMEM); - - fc->sdata = (char *)fc + sizeof(*fc); - - buf_init(bufp, (char *)fc->sdata, size); - v9fs_put_int32(bufp, size, &fc->size); - v9fs_put_int8(bufp, id, &fc->id); - 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) { - size += 2 + /* extension[s] */ - (extension == NULL ? 0 : strlen(extension)); - } - - 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; -} |